Hollow rolled strip object cutting mechanism and method

Abstract

The invention provides a cutting mechanism and method for a hollow rolled strip object. The cutting mechanism comprises a feeding side inserting shaft assembly and a discharging side inserting shaft assembly. When the cutter cuts a hollow rolled strip object, the right expandable head of the feeding side inserting shaft assembly and the left expandable head of the discharging side inserting shaft assembly are inserted into a hollow hole of the hollow rolled strip object from the feeding side and the discharging side respectively. And the outer diameters of the right expandable head and the left expandable head are respectively propped against the hollow hole of the hollow rolled strip object. The invention further comprises a process for improving the back-rolling deformation, so that the problem of the back-rolling deformation generated by the hole edge of the hollow rolled strip object during the cutting operation is solved. The cutting device further comprises a cutter pressure releasing mechanism which can release pre-compressed and energy-stored elastic force to the hollow rolled strip object when the cutter cuts the hollow rolled strip object and release corresponding elastic pressure according to the cutting depth of the cutter.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting hollow coiled strip objects, and in particular to a cutting mechanism and method for hollow coiled strip objects without a tube shaft. Background Art

[0002] Existing fiber or paper roll products primarily use a tubular shaft to hold the long fiber or paper material. The holes in the tube serve as a central axis for hanging and pulling. With the development of related technologies, hollow roll products (hollow roll objects) that do not use a tubular shaft have emerged, driven by environmental and cost considerations.

[0003] like Figure 1 As shown, in the process of manufacturing the hollow coil object A, the long hollow coil object A must be cut (cut into segments) with a cutter 1 to form several segments of finished products for use. However, the material of the hollow coil object A is generally fiber or paper material. During the cutting process, due to the cutting pressure of the cutter 1, the hollow hole A1 of the hollow coil object A will have the problem of hole edge collapse and deformation A2 on both sides of the cut portion where the cutter 1 cuts. In order to solve the problem of hole edge collapse and deformation A2, the generally adopted method is: insert an insertion shaft 11 (such as Figure 2 As shown, the two insertion shafts 11 face each other and are separated by a clearance within the safe cutting range of the cutter 1 to minimize the risk of hole edge collapse A2 during cutting. However, the above-mentioned technical solution still has some problems, such as the insertion of the insertion shaft 11 into the hollow hole A1 of the hollow roll object A, which is often not smooth, the stroke control is inaccurate, the efficiency is poor, and the mechanism size must be significantly changed when the paper roll size changes.

[0004] Furthermore, existing cutting mechanism designs prevent the use of serrated blades to maintain a smooth cut surface on hollow coils. However, this approach lacks sufficient clearance between the blade and the material being cut, creating sticking resistance. This also makes deep cuts difficult when the material is dense and inelastic. Summary of the invention

[0005] The purpose of the present invention is to provide a hollow coil object cutting mechanism and method, to improve the problem of hole edge collapse and deformation at the center hole of the hollow coil object during the cutting process, to improve production efficiency, and to reduce the troubles of subsequent processes and reduced functionality in future use.

[0006] To achieve the foregoing objectives, in a first aspect, the present invention provides a cutting mechanism for a hollow rolled strip object, which includes: a cutting portion configured with a cutting knife and pre-defining a cutting position; a feeding side located on one side of the cutting portion, supplying the hollow rolled strip object to the cutting portion through a material trough, the hollow rolled strip object having a hollow hole; a discharging side located on the other side of the cutting portion; a feeding-side insertion shaft assembly disposed in the feeding side, the feeding-side insertion shaft assembly including a right expandable head that can be inserted into the hollow hole of the hollow rolled strip object from the feeding side towards the cutting portion, and the right expandable head can be controlled to be in an expanded state or a contracted state; a discharging-side insertion shaft assembly disposed in the discharging side, the discharging-side insertion shaft assembly including a left expandable head that can be inserted into the hollow hole of the hollow rolled strip object from the discharging side towards the cutting portion, and the left expandable head can be controlled to be in an expanded state or a contracted state; wherein, when the hollow rolled strip object is fed into the cutting portion through the material trough and protrudes a predetermined length beyond the cutting position, the right expandable head is inserted into the hollow hole of the hollow rolled strip object from the feeding side towards the cutting portion, the left expandable head is inserted into the hollow hole of the hollow rolled strip object from the discharging side towards the cutting portion, the right expandable head and the left expandable head are located on both sides of the cutting position opposite to each other and separated by a knife avoidance gap, the outer diameters of the right expandable head and the left expandable head respectively abut against the hollow hole of the hollow rolled strip object in the expanded state, and the cutting knife cuts the hollow rolled strip object along the cutting position.

[0007] In terms of effects, the present invention improves the problem of hole edge collapse and deformation at the center hole during the cutting process of the hollow rolled strip object, improves production efficiency, and can reduce the troubles of subsequent processes and reduced functionality in future use. The present invention introduces a servo drive assembly in the cutting mechanism for the hollow rolled strip object to control the feeding-side insertion shaft assembly and the discharging-side insertion shaft assembly, so as to accelerate the operation procedure, precisely control the stroke, increase the production rate, and can meet the different aperture requirements of different hollow rolled strip objects and the purpose of fine-tuning the expansion / contraction of the feeding-side insertion shaft assembly and the discharging-side insertion shaft assembly.

[0008] In a preferred embodiment of the present invention, the feeding-side insertion shaft assembly includes: a right outer catheter, one end of which is connected to the right expandable head, and the other end of which is coupled to a right pulley. The end portion of the right expandable head is divided into a plurality of claw portions arranged in a circular array, and a right conical hole is formed between the plurality of claw portions; a right conical head, which is displaceably accommodated in the right conical hole; a right servo drive assembly; a right central drive shaft, one end of which is connected to the right conical head, and the other end of which is connected to the right servo drive assembly through the hollow space of the right outer catheter; when the right central drive shaft is driven by the right servo drive assembly to displace in the direction of the cutting portion, it drives the right conical head to displace to push the inner hole wall of the right conical hole of the right expandable head, so that the plurality of claw portions of the right expandable head expand outwards, and the outer diameter of the right expandable head is enlarged; when the right central drive shaft is driven by the right servo drive assembly to displace in the direction away from the cutting portion, the pressure of each of the claw portions of the right expandable head due to the extrusion of the right conical head becomes smaller or is not extruded, so that the outer diameter of the right expandable head is reduced.

[0009] In a preferred embodiment of the present invention, the right servo drive assembly includes: a right servo motor, which drives a rotating sleeve to rotate; a ball nut, which is key-connected to the rotating sleeve, and the ball nut rotates with the rotating sleeve; a ball screw, which is screwed to the ball nut, and the ball screw can be driven by the ball nut to perform a telescopic linear motion corresponding to the inside of the ball nut; a ball spline, which connects the ball screw and the right central drive shaft; a spline bushing, which is sleeved on the ball spline and is key-connected to a fixed cylinder, so that the ball spline can drive the right central drive shaft to perform a linear motion in the left-right direction, so that the right conical head can perform a linear motion displacement in the right conical hole in the left-right direction, and further the outer diameter of the right expandable head is enlarged or reduced.

[0010] In a preferred embodiment of the present invention, the discharge-side insertion shaft assembly includes: a left outer conduit, one end of which is connected to the left expandable head, and the other end of which is coupled to a left pulley. The end portion of the left expandable head is divided into a plurality of claw portions arranged in a ring, and a left conical hole is formed between the plurality of claw portions; a left conical head, displaceably accommodated in the left conical hole; a left servo drive assembly; a left central drive shaft, one end of which is connected to the left conical head, and the other end of which is connected to the left servo drive assembly through the hollow space of the left outer conduit; when the left central drive shaft is driven by the left servo drive assembly to displace in the direction of the cutting portion, it drives the left conical head to displace to push against the inner hole wall of the left conical hole of the left expandable head, so that the plurality of claw portions of the left expandable head expand outward, and the outer diameter of the left expandable head is enlarged; when the left central drive shaft is driven by the left servo drive assembly to displace in the direction away from the cutting portion, the pressure of each of the claw portions of the left expandable head being squeezed by the left conical head becomes smaller or is not squeezed, so that the outer diameter of the left expandable head is reduced.

[0011] In a preferred embodiment of the present invention, the left servo drive assembly includes: a left servo motor, driving a rotary sleeve to rotate; a ball nut, key-connected to the rotary sleeve, and the ball nut rotates with the rotary sleeve; a ball screw, screwed to the ball nut, and the ball screw can be driven by the ball nut to perform a telescopic linear motion corresponding to the inside of the ball nut; a ball spline, connecting the ball screw and the left central drive shaft; a spline bushing, sleeved on the ball spline and key-connected to a fixed cylinder, so that the ball spline can drive the left central drive shaft to perform a linear motion in the left and right directions, and the left conical head can perform a linear motion displacement in the left conical hole in the left and right directions, thereby enlarging or reducing the outer diameter of the left expandable head.

[0012] In a preferred embodiment of the present invention, the hollow strip object cutting mechanism further includes: a feed-side clamp, arranged on the right side of the cutting position; a discharge-side clamp, arranged on the left side of the cutting position; a cutter pressure release mechanism, arranged at the cutting portion, and the cutter pressure release mechanism includes a right elastic member and a left elastic member, which are pre-compressed and stored with energy when the cutter does not cut the hollow strip object; when the cutter starts to cut the hollow strip object, the right elastic member and the left elastic member release the elastic force of the compressed energy storage to the bottom edges of the feed-side clamp and the discharge-side clamp, so that the hollow strip object enlarges the crack at the cutting position; when the cutting depth of the cutter cutting the hollow strip object deepens, the right elastic member and the left elastic member release corresponding elastic pressures to the feed-side clamp and the discharge-side clamp according to the cutting depth of the cutter.

[0013] The cutter pressure release mechanism of the present invention can release the pre-compressed and energy-stored elastic force to the hollow strip object when the cutter cuts the hollow strip object, and release the corresponding elastic pressure according to the cutting depth of the cutter.

[0014] In a preferred embodiment of the present invention, the cutter pressure release mechanism includes: the feeding-side clamp is connected to a right positioning plate through a right rotation center; a right crankshaft is located at the bottom of the feeding-side clamp; a right crankshaft connecting rod is arranged between the feeding-side clamp and the right crankshaft, and the right crankshaft connecting rod combines the right elastic member; a right servo motor is connected to the right crankshaft to drive the right crankshaft to rotate; the discharging-side clamp is connected to a left positioning plate through a left rotation center; a left crankshaft is located at the bottom of the discharging-side clamp; a left crankshaft connecting rod is arranged between the discharging-side clamp and the left crankshaft, and the left crankshaft connecting rod combines the left elastic member; a left servo motor is connected to the left crankshaft to drive the left crankshaft to rotate.

[0015] In a second aspect, the present invention also provides a method for cutting a hollow strip object. When a cutter of a hollow strip object cutting mechanism cuts a hollow strip object, a pre-compressed and energy-stored elastic force is applied to the cutting position of the hollow strip object. The method includes the following steps:

[0016] (a) Set a feeding-side clamp on the right side of the cutting position to clamp the hollow strip object;

[0017] (b) Set a discharging-side clamp on the left side of the cutting position to clamp the hollow strip object;

[0018] (c) When the cutter does not cut the hollow strip object, perform a cutter pressure release process to pre-compress and store energy in a right elastic member and a left elastic member;

[0019] (d) When the cutter starts to cut the hollow strip object, the right elastic member and the left elastic member respectively release the compressed and energy-stored elastic force to the bottom edge of the feeding-side clamp and the bottom edge of the discharging-side clamp, so that the hollow strip object enlarges the crack at the cutting position;

[0020] (e) When the cutting depth of the cutter cutting the hollow strip object increases, the right elastic member and the left elastic member release the corresponding elastic pressure to the feeding-side clamp and the discharging-side clamp according to the cutting depth of the cutter.

[0021] According to an embodiment of the present invention, the cutter pressure release process described in step (c) includes the following steps:

[0022] (c1) Arrange a right crankshaft at the bottom of the feeding-side clamp;

[0023] (c2) Arrange a right crankshaft connecting rod between the feeding-side fixture and the right crankshaft, and the right crankshaft connecting rod is combined with the right elastic member;

[0024] (c3) A right servo motor is connected to the right crankshaft to drive the right crankshaft to rotate;

[0025] (c4) Arrange a left crankshaft at the bottom of the discharging-side fixture;

[0026] (c5) Arrange a left crankshaft connecting rod between the discharging-side fixture and the left crankshaft, and the left crankshaft connecting rod is combined with the left elastic member;

[0027] (c6) A left servo motor is connected to the left crankshaft to drive the left crankshaft to rotate.

[0028] In a third aspect, the present invention further provides another method for cutting a hollow strip object, which is used to trim the reverse-rolling deformation generated at the hole edge of a hollow strip object after being cut by a cutter of a hollow strip object cutting mechanism. The hollow strip object cutting mechanism includes a cutting part; a feeding side; a discharging side; a pushing plate arranged on the feeding side; a feeding-side plug shaft assembly arranged on the feeding side, and the feeding-side plug shaft assembly includes a right expandable head that can be inserted into the hollow hole of the hollow strip object, and the right expandable head can be controlled to be in an expanded state or a contracted state; a discharging-side plug shaft assembly arranged on the discharging side, and the discharging-side plug shaft assembly includes a left expandable head that can be inserted into the hollow hole of the hollow strip object, and the left expandable head can be controlled to be in an expanded state or a contracted state. The method includes the following steps:

[0029] (a) After the cutter completes cutting the hollow strip object at a cutting position, the cutter rises; the left cone head retreats, so that the outer diameter of the left expandable head shrinks; the outer diameter of the right expandable head remains in an expanded state; the pushing plate pushes the hollow strip object to the left by a predetermined length;

[0030] (b) The left cone head moves to the right to expand the outer diameter of the left expandable head; at this time, the outer diameter of the right expandable head remains in an expanded state; the cutter cuts down;

[0031] (c) After the cutting is completed, the cutter rises; at this time, in the state where the hollow strip object is stationary, the left cone head retreats to shrink the outer diameter of the left expandable head; at this time, with the outer diameter of the right expandable head in an expanded state, the right expandable head moves to the left across the cutting position, and the front reverse-rolling deformation of the front hole edge of the hollow strip object is trimmed by the outer ring edge of the right expandable head;

[0032] (d) The pusher plate pushes the hollow coiled strip object to the left by a predetermined length; during the process that the hollow coiled strip object is pushed to the left and exceeds the stroke of the left expandable head, the outer ring edge of the left expandable head trims the reverse curling deformation of the rear hole edge of the hollow coiled strip object;

[0033] (e) When the hollow coiled strip object is pushed to the left to reach the predetermined length at the cutting position, the pusher plate stops pushing; the left tapered head moves to the right to expand the outer diameter of the left expandable head; at this time, the outer diameter of the right expandable head remains in an expanded state;

[0034] (f) Repeat the above steps (a) to (e) in a loop until the cutting of the entire hollow coiled strip object is completed.

[0035] In the reverse curling deformation process of the present invention, the hole edge of the hollow coiled strip object can be trimmed during the cutting operation of the hollow coiled strip object, improving the problem of reverse curling deformation generated at the hole edge of the hollow coiled strip object. Description of the Drawings

[0036] Figure 1 A schematic diagram showing that in the prior art, when the hollow coiled strip object is cut by a cutting tool, there will be hole edge collapse deformation on both sides of the cutting position.

[0037] Figure 2 A schematic diagram showing that in the prior art, an insertion shaft is inserted into each of the hollow holes of the hollow coiled strip object, but there will still be hole edge collapse deformation on both sides of the cutting position when it is cut by a cutting tool.

[0038] Figure 3 A schematic diagram showing the cutting mechanism of the hollow coiled strip object of the present invention.

[0039] Figure 4 Showing Figure 3 A side view of the configuration relationship among the pusher plate, the material trough and the hollow coiled strip object.

[0040] Figure 5 Showing Figure 3 A left side view of the cutting part, which is a side view showing the configuration relationship among the cutting tool, the discharge side fixture, the pusher plate and the related cutting tool drive components.

[0041] Figure 6 A schematic diagram showing the state of the present invention during the feeding / discharging operation.

[0042] Figure 7 A schematic diagram showing the state of the present invention during the cutting operation.

[0043] Figure 8 A simplified schematic diagram showing the corresponding relationship between the feeding side insertion shaft assembly and the discharge side insertion shaft assembly of the present invention.

[0044] Figure 9 Display Figure 8 Schematic diagram of the end part of the right expandable head being segmented into a plurality of claw parts arranged in a ring

[0045] Figure 10 Display Figure 8 Cross-sectional view of the feeding-side inserting shaft assembly and the right servo drive assembly

[0046] Figure 11 Display Figure 8 Schematic diagram of the discharging-side inserting shaft assembly and the left servo drive assembly

[0047] Figure 12 Enlarged schematic diagram showing the corresponding relationship between the right expandable head and the left expandable head of the present invention in the state of expanded outer diameter

[0048] Figure 13 Enlarged schematic diagram showing the corresponding relationship between the right expandable head and the left expandable head of the present invention in the state of reduced outer diameter

[0049] Figure 14A - Figure 14E Flowchart showing the operation of the reverse winding deformation trimming process of the present invention

[0050] Figure 15A - Figure 15C Display of the cutter pressure release mechanism of the present invention and its operation schematic diagram

[0051] Explanation of reference numerals:

[0052] 100, cutting part; 200, feeding side; 300, discharging side; 400, cutter pressure release mechanism;

[0053] 1, cutter; 11, inserting shaft; 12a, feeding-side clamp; 12b, discharging-side clamp; 13a, right rotation center; 13b, left rotation center; 14a, right positioning plate; 14b, left positioning plate;

[0054] 2, feeding-side inserting shaft assembly; 21, right trolley; 211, right trolley drive assembly; 22, right expandable head; 221, claw part; 222, right tapered hole; 23, right taper head; 24, right outer conduit; 25, right center drive shaft; 26, right servo drive assembly; 261, right servo motor; 271, speed reducer; 272, output shaft; 273, rotating sleeve; 274, key; 275, ball nut; 276, ball screw; 277, ball spline; 278, spline bushing; 279, key; 280, fixed cylinder;

[0055] 3, pushing plate; 31, pushing plate drive assembly;

[0056] 4, material trough;

[0057] 5. Discharge side plug shaft assembly; 51. Left pulley; 511. Left pulley drive assembly; 52. Left expandable head; 521. Claw; 522. Left tapered hole; 53. Left cone head; 54. Left outer guide tube; 55. Left center drive shaft; 56. Left servo drive assembly; 561. Left servo motor; 571. Reducer; 572. Output shaft; 573. Rotary sleeve; 574. Key; 575. Ball nut; 576. Ball screw; 577. Ball spline; 578. Spline bushing; 579. Key; 580. Fixed cylinder;

[0058] 6. Baffle;

[0059] 7. Discharging mechanism;

[0060] 81a, right crankshaft connecting rod; 81b, left crankshaft connecting rod; 82a, right crankshaft; 82b, left crankshaft; 83a, right elastic member; 83b, left elastic member; 84a, right servo motor; 84b, left servo motor;

[0061] A, hollow rolled object; A1, hollow hole; A2, hole edge collapse and deformation; A3, front roll deformation; A4, rear roll deformation; B, finished product; P1, cutting position. DETAILED DESCRIPTION

[0062] See Figure 3 As shown, the machine comprises a cutting unit 100, an infeed side 200, and an outfeed side 300 on a base. The cutting unit 100 has a predefined cutting position P1, and a cutter 1 is positioned corresponding to this cutting position P1. An infeed side fixture 12a and an outfeed side fixture 12b are positioned on either side of this cutting position P1, respectively.

[0063] The feed side 200 includes a feed side insert shaft assembly 2, a push plate 3, and a chute 4. The feed side insert shaft assembly 2 includes a right pulley 21, which is driven by a right pulley drive assembly 211 for horizontal linear motion. The push plate 3, driven by a push plate drive assembly 31, can move linearly to push the hollow coiled object A toward the cutting section 100. The chute 4 is located between the push plate 3 and the cutting section 100. Figure 4 show Figure 3 A side view showing the arrangement relationship between the middle push plate 3, the material trough 4 and the hollow coil object A. Figure 5 show Figure 3 The left side view of the middle cutting section 100 shows the configuration relationship between the cutter 1, the discharge side clamp 12b, the push plate 3 and the cutter-related driving components.

[0064] The discharging side 300 includes a discharging-side inserting shaft assembly 5, a baffle 6, and a discharging mechanism 7. The discharging-side inserting shaft assembly 5 includes a left sliding block 51, and the discharging-side inserting shaft assembly 5 can perform a linear motion in the left-right direction under the drive of a left sliding block drive assembly 511. The baffle 6 is disposed between the cutting portion 100 and the discharging side 300.

[0065] Refer to Figure 6 and Figure 7 as shown in Figure 6 FIG. showing the schematic diagram of the present invention in the state of replenishing / discharging materials, Figure 7 FIG. showing the schematic diagram of the present invention in the state of performing the cutting operation. As Figure 6 shown in, when the right sliding block 21 and the pushing plate 3 retreat to the right terminal, that is, between the cutting portion 100 and the feeding side 200, a clear feeding area is formed. At this time, the hollow strip object A can be placed on the material trough 4.

[0066] After the hollow strip object A is properly placed on the material trough 4, the right expandable head 22 in the feeding-side inserting shaft assembly 2 can be inserted into the hollow hole A1 of the hollow strip object A from the feeding side 200 towards the cutting portion 100, and move leftward to a predetermined point. At the same time, the pushing plate 3 pushes the hollow strip object A towards the cutting portion 100, so that the left end of the hollow strip object A protrudes from the cutting position P1 by a predetermined length. At the same time, the left expandable head 52 in the discharging-side inserting shaft assembly 5 can also be inserted into the hollow hole A1 of the hollow strip object A from the discharging side 300 towards the cutting portion 100, waiting for cutting.

[0067] As Figure 7 shown in, the hollow strip object A fed into the cutting portion 100 is cut by the cutter 1 to form a finished product B with a predetermined length. The multiple finished products B formed after cutting will be blocked by the baffle 6, and the left expandable head 52 of the discharging-side inserting shaft assembly 5 is still inserted into the hollow hole of the hollow strip object A. When the left sliding block 51 retreats to the left terminal, the discharging-side inserting shaft assembly 5 also moves leftward accordingly, so that the multiple cut finished products B fall onto the discharging mechanism 7 and are sent out by the ramp conveyor belt of the discharging mechanism 7.

[0068] Refer to Figure 8 shown in, which shows a simplified schematic diagram of the corresponding relationship between the feeding-side inserting shaft assembly 2 and the discharging-side inserting shaft assembly 5 in the present invention. As Figure 8 shown in, the left end of the feeding-side inserting shaft assembly 2 is combined with the right expandable head 22, and the end of the right expandable head 22 is divided into a plurality of claw portions 221 arranged in a ring (as Figure 9 ), and a right conical hole 222 is formed between the plurality of claw portions 221. A right cone head 23 is displaceably accommodated in the right conical hole 222.

[0069] Similarly, the right end of the discharge side insertion shaft assembly 5 is combined with a left expandable head 52. The end of the left expandable head 52 is also divided into a plurality of claw portions 521 arranged in a ring, and a left tapered hole 522 is formed between the plurality of claw portions 521. A left tapered head 53 is displaceably accommodated in the left tapered hole 522.

[0070] Figure 10 Show Figure 8 A cross-sectional view of the inlet side insertion shaft assembly 2. One end of a right outer conduit 24 is combined with the right expandable head 22, and the other end is combined with the right pulley 21. One end of a right central drive shaft 25 is combined with the right tapered head 23, and the other end is connected to a right servo drive assembly 26 through the internal space of the right outer conduit 24.

[0071] The right servo drive assembly 26 includes a right servo motor 261. When the right servo motor 261 rotates, the output shaft 272 decelerated by the speed reducer 271 drives the rotary sleeve 273 to rotate. A ball nut 275 is key-connected to the rotary sleeve 273 through a key 274, so the ball nut 275 can rotate with the rotary sleeve 273, and a ball screw 276 is screwed to the ball nut 275, so the ball screw 276 can make a telescopic linear motion relative to the ball nut 275. The ball screw 276 is connected to the right central drive shaft 25 through a ball spline 277. An outer ring of the ball spline 277 is sleeved with a spline bushing 278, and then key-connected to a fixed cylinder 280 through a key 279, so that the ball spline 277 can only make a linear motion in the left and right directions. Therefore, the ball spline 277 can drive the right central drive shaft 25 to make a linear motion in the left and right directions, so that the right tapered head 23 can make a linear motion displacement in the right tapered hole 222 in the left and right directions, and further expand or contract the outer diameter of the right expandable head 22.

[0072] Figure 11 Show Figure 8 A cross-sectional view of the discharge side insertion shaft assembly 5. One end of a left outer conduit 54 is combined with the left expandable head 52, and the other end is combined with the left pulley 51. One end of a left central drive shaft 55 is combined with the left tapered head 53, and the other end is connected to a left servo drive assembly 56 through the internal space of the left outer conduit 54.

[0073] The left servo drive assembly 56 includes a left servo motor 561. When the left servo motor 561 rotates, the output shaft 572 decelerated by the speed reducer 571 drives the rotating sleeve 573 to rotate. A ball nut 575 is key-connected to the inside of the rotating sleeve 573 through a key 574, so the ball nut 575 can rotate with the rotating sleeve 573. A ball screw 576 is screwed to the ball nut 575, and the ball screw 576 can perform telescopic linear motion relative to the ball nut 575. The ball screw 576 is connected to the left center drive shaft 55 through a ball spline 577. An outer ring of the ball spline 577 is sleeved with a spline bushing 578 and is key-connected to a fixed cylinder 580 through a key 579, so that the ball spline 577 can only perform linear motion in the left and right directions. Therefore, the spline bushing 578 can drive the left center drive shaft 55 to perform linear motion in the left and right directions, so that the left conical head 53 can perform linear displacement in the left conical hole 522 in the left and right directions, and further expand or contract the outer diameter of the left expandable head 52.

[0074] In the present invention, a servo motor is paired with related components to replace the action of a traditional air cylinder, so that the operation procedure is accelerated and the production rate is improved. In the present invention, the drive of the servo motor is in the form of stepless stroke control to achieve the expansion / contraction of the outer diameters of the right expandable head 22 and the left expandable head 52, which can meet the different aperture requirements of different hollow strip objects and the purpose of fine-tuning expansion / contraction.

[0075] Furthermore, the drive of the servo motor can easily change the size of the expansion / contraction of the outer diameter of the right expandable head 22 by adjusting the displacement stroke of the right conical head 23 and can easily change the size of the expansion / contraction of the outer diameter of the left expandable head 52 by adjusting the displacement stroke of the left conical head 53. The above design of the present invention can adapt to the inner diameter sizes of different hollow strip object products, reduce the production and replacement of standard parts, finely adjust the expansion amplitude of the right expandable head 22 and the left expandable head 52, and obtain the best production quality.

[0076] Figure 12 An enlarged schematic diagram showing the corresponding relationship between the right expandable head 22 and the left expandable head 52 in the state of expanded outer diameter in the present invention. When the right conical head 23 displaces to the left and pushes the inner hole wall of the right conical hole 222 of the right expandable head 22, each claw 221 of the right expandable head 22 expands outwards, so that the outer diameter of the right expandable head 22 expands. When the left conical head 53 displaces to the right and pushes the inner hole wall of the left conical hole 522 of the left expandable head 52, each claw 521 of the left expandable head 52 expands outwards, so that the outer diameter of the left expandable head 52 expands.

[0077] When the hollow strip object A is fed into the cutting part 100 and protrudes a predetermined length beyond the cutting position P1, both the right expandable head 22 and the left expandable head 52 are located on both sides of the cutting position P1 opposite to each other and are spaced apart by a cutting tool clearance. With the outer diameters of the right expandable head 22 and the left expandable head 52 in the outward-expanded state, they respectively abut against the inner ring edge of the hollow strip object A, and then the cutting tool 1 cuts the hollow strip object A along the cutting position P1.

[0078] During the cutting operation and the material pushing operation of the hollow strip object A in the present invention, through the operation of expanding / contracting the outer diameters of the right expandable head 22 and the left expandable head 52, it is beneficial for the right expandable head 22 and the left expandable head 52 to be inserted into the hollow hole A1 of the hollow strip object A and beneficial for the cutting operation.

[0079] Figure 13 An enlarged schematic diagram showing the corresponding relationship of the right expandable head 22 and the left expandable head 52 in the present invention in the state of reduced outer diameter. When the right cone head 23 is displaced to the right (i.e., away from the cutting part 100) under the drive of the right servo drive assembly 26, the pressure exerted on each claw part 221 of the right expandable head 22 becomes smaller or is not squeezed, causing the outer diameter of the right expandable head 22 to contract. Similarly, when the left cone head 53 is displaced to the left under the drive of the left servo drive assembly 56, the pressure exerted on each claw part 521 of the left expandable head 52 becomes smaller or is not squeezed, causing the outer diameter of the left expandable head 52 to contract.

[0080] When the cutting tool 1 cuts the hollow strip object A, when the first section of the finished product B is cut and the hollow strip object A is pushed forward by another predetermined length, since there must be a cutting tool clearance at the cutting position P1, full support cannot be completely obtained in the hollow hole A1 of the hollow strip object A, resulting in a problem of local collapse and deformation at the side edge of the cutting position P1 of the hollow strip object A. When the left expandable head 52 is pushed into the hollow hole A1 of the hollow strip object A, the left expandable head 52 will cause a problem of reverse curling deformation at the collapsed and deformed part. In the present invention, in order to further improve the problem of reverse curling deformation, on the basis of the above-mentioned structural design, an additional reverse curling deformation trimming process is added.

[0081] Figure 14A - Figure 14E A flowchart showing the operation of the reverse curling deformation trimming process of the present invention, the sequential steps of which include:

[0082] As Figure 14A : After the cutting is completed, the cutting tool 1 rises; the left cone head 53 retracts, causing the outer diameter of the left expandable head 52 to contract; the outer diameter of the right expandable head 22 remains in the expanded state; the pusher plate 3 pushes the hollow strip object A to the left by a predetermined length;

[0083] As Figure 14B: The left conical head 53 moves rightward to expand the outer diameter of the left expandable head 52; at this time, the outer diameter of the right expandable head 22 remains in the expanded state; the cutter 1 cuts downward;

[0084] As Figure 14C : When the cutting is completed, the cutter 1 rises; at this time, with the hollow coiled strip object A stationary, the left conical head 53 retracts to contract the outer diameter of the left expandable head 52; at this time, with the outer diameter of the right expandable head 22 in the expanded state, the right expandable head 22 moves leftward across the cutting position P1, and the front reverse roll deformation A3 of the front hole edge of the hollow coiled strip object A is trimmed by the outer ring edge of the right expandable head 22;

[0085] As Figure 14D : The pusher plate 3 pushes the hollow coiled strip object A leftward by a predetermined length; when the hollow coiled strip object A is pushed leftward and exceeds the stroke of the left expandable head 52, the rear reverse roll deformation A4 of the rear hole edge of the hollow coiled strip object A is trimmed by the outer ring edge of the left expandable head 52;

[0086] As Figure 14E : When the hollow coiled strip object A is pushed leftward to the predetermined length at the cutting position P1, the pusher plate 3 stops pushing; the left conical head 53 moves rightward to expand the outer diameter of the left expandable head 52; at this time, the outer diameter of the right expandable head 22 remains in the expanded state;

[0087] Repeat the above steps in a loop until the entire hollow coiled strip object A is cut off.

[0088] In the cutting mechanism for the hollow coiled strip object of the present invention, the cutting part 100 further includes a cutter pressure release mechanism 400, so that during the cutting of the hollow coiled strip object A by the cutter 1, the cut hollow coiled strip object A can be peeled off to eliminate the gradually increasing resistance when the cutting depth of the cutter 1 increases.

[0089] As Figure 15A - Figure 15C As shown, it shows the cutter pressure release mechanism of the present invention and its operation schematic diagram. On both sides of the cutter 1 of the hollow coiled strip object A, there are respectively a feeding side clamp 12a and a discharging side clamp 12b for clamping the hollow coiled strip object A. The feeding side clamp 12a and the discharging side clamp 12b are respectively connected to the right positioning plate 14a and the left positioning plate 14b through a right rotation center 13a and a left rotation center 13b.

[0090] The cutter pressure release mechanism 400 of the present invention includes a right crankshaft link 81a, the top of which is connected to the bottom edge of the feeding side clamp 12a, and the bottom end of the right crankshaft link 81a is connected to a right crankshaft 82a. The right crankshaft link 81a is further combined with a right elastic member 83a. The right crankshaft 82a can be driven by a right servo motor 84a to rotate. When the right crankshaft 82a is driven by the right servo motor 84a to rotate by an angle, the right elastic member 83a can be compressed to store energy.

[0091] Similarly, the top end of a left crankshaft connecting rod 81b is connected to the bottom edge of the discharging-side clamp 12b, and the bottom end of the left crankshaft connecting rod 81b is connected to a left crankshaft 82b. The left crankshaft connecting rod 81b is further combined with a left elastic member 83b. The left crankshaft 82b can be driven by a left servo motor 84b to rotate. When the left crankshaft 82b is driven by the left servo motor 84b to rotate by an angle, the left elastic member 83b can be compressed to store energy.

[0092] Before the cutter 1 cuts the hollow strip object A, a cutter pressure release process is first performed, that is, the right crankshaft 82a and the left crankshaft 82b are lifted to respectively abut against the right crankshaft connecting rod 81a and the left crankshaft connecting rod 81b, so that the right elastic member 83a and the left elastic member 83b are compressed to store energy. When the cutter 1 starts to cut the hollow strip object A, since the structure of the hollow strip object A is partially damaged at the cutting position P1, at this time, the right elastic member 83a and the left elastic member 83b release the originally compressed elastic force, and respectively apply the elastic force to the feeding-side clamp 12a and the discharging-side clamp 12b through the right crankshaft connecting rod 81a and the left crankshaft connecting rod 81b. Therefore, the hollow strip object A enlarges the crack at the cutting position P1, relieves the adhesion resistance of the hollow strip object A to the cutter 1, and makes it easy for the cutter 1 to cut the hollow strip object A.

[0093] When the cutter 1 cuts deeper into the hollow strip object A, the right elastic member 83a and the left elastic member 83b can release corresponding elastic pressures to the bottom edge of the feeding-side clamp 12a and the bottom edge of the discharging-side clamp 12b according to the cutting depth of the cutter 1, and play an ideal best cutting-assisting function of peeling while cutting.

[0094] The above embodiments are only illustrative of the structural design of the present invention and are not used to limit the present invention. Those skilled in the art can modify and change the above embodiments within the structural design and spirit of the present invention, and these changes are still within the protection scope of the present invention.

Claims

1. A cutting mechanism for a hollow coiled strip object, comprising: A cutting part, which is provided with a cutting knife and predefines a cutting position; An inlet side, located on one side of the cutting part, supplies the hollow coiled strip object to the cutting part through a material trough, and the hollow coiled strip object has a hollow hole; An outlet side, located on the other side of the cutting part; It is characterized in that it further comprises: An inlet side insertion shaft assembly, configured in the inlet side, the inlet side insertion shaft assembly includes a right expandable head, and the right expandable head can be inserted into the hollow hole of the hollow coiled strip object from the inlet side towards the cutting part, and the right expandable head can be controlled to be in an expanded state or a contracted state; An outlet side insertion shaft assembly, configured in the outlet side, the outlet side insertion shaft assembly includes a left expandable head, and the left expandable head can be inserted into the hollow hole of the hollow coiled strip object from the outlet side towards the cutting part, and the left expandable head can be controlled to be in an expanded state or a contracted state; Wherein, when the hollow coiled strip object is fed into the cutting part through the material trough and protrudes a predetermined length from the cutting position, the right expandable head is inserted into the hollow hole of the hollow coiled strip object from the inlet side towards the cutting part, and the left expandable head is inserted into the hollow hole of the hollow coiled strip object from the outlet side towards the cutting part. The right expandable head and the left expandable head are located on both sides of the cutting position opposite to each other and are spaced apart by a knife avoidance gap. The outer diameters of the right expandable head and the left expandable head respectively abut against the hollow hole of the hollow coiled strip object in the expanded state, and the cutting knife cuts the hollow coiled strip object along the cutting position.

2. The hollow strip object cutting mechanism according to claim 1, characterized in that, The inlet side insertion shaft assembly includes: A right outer catheter, one end of which is connected to the right expandable head, and the other end is combined with a right pulley. The end part of the right expandable head is divided into a plurality of claw parts arranged in a ring, and a right conical hole is formed between the plurality of claw parts; A right cone head, which is displaceably accommodated in the right conical hole; A right servo drive assembly; A right central drive shaft, one end of which is connected to the right cone head, and the other end is connected to the right servo drive assembly through the hollow space of the right outer catheter; When the right central drive shaft is driven by the right servo drive assembly to displace towards the cutting part, it drives the right cone head to displace to push against the inner hole wall of the right conical hole of the right expandable head, so that the plurality of claw parts of the right expandable head expand outwards, and the outer diameter of the right expandable head expands; When the right central drive shaft is driven by the right servo drive assembly to displace away from the cutting part, the pressure of each of the claw parts of the right expandable head due to the extrusion of the right cone head becomes smaller or is not extruded, so that the outer diameter of the right expandable head shrinks.

3. The hollow strip object cutting mechanism according to claim 2, characterized in that, The right servo drive assembly includes: A right servo motor, which drives a rotating sleeve to rotate; A ball screw nut, which is key-connected to the rotating sleeve, and the ball screw nut rotates with the rotating sleeve; A ball screw is screwed to the ball nut, and the ball screw can be driven by the ball nut to perform telescopic linear motion corresponding to the inside of the ball nut; A ball spline connects the ball screw and the right central drive shaft; A spline bushing is sleeved on the ball spline and key-connected to a fixed cylinder, so that the ball spline can drive the right central drive shaft to perform linear motion in the left-right direction, enabling the right cone head to perform linear motion displacement in the right conical hole in the left-right direction, and further expanding or shrinking the outer diameter of the right expandable head.

4. The hollow strip object cutting mechanism according to claim 1, characterized in that, The discharge side insertion shaft assembly includes: A left outer conduit, one end of which is connected to the left expandable head and the other end is combined with a left pulley. The end portion of the left expandable head is divided into a plurality of claw portions arranged in a ring, and a left conical hole is formed between the plurality of claw portions; A left cone head is displaceably accommodated in the left conical hole; A left servo drive assembly; A left central drive shaft, one end of which is connected to the left cone head and the other end is connected to the left servo drive assembly through the hollow space of the left outer conduit; When the left central drive shaft is driven by the left servo drive assembly to displace in the direction of the cutting portion, it drives the left cone head to displace to push against the inner hole wall of the left conical hole of the left expandable head, causing the plurality of claw portions of the left expandable head to expand outward and expanding the outer diameter of the left expandable head; When the left central drive shaft is driven by the left servo drive assembly to displace in the direction away from the cutting portion, the pressure exerted on each of the claw portions of the left expandable head by the left cone head becomes smaller or is not subjected to extrusion, causing the outer diameter of the left expandable head to shrink.

5. The hollow strip-shaped object cutting mechanism according to claim 4, wherein The left servo drive assembly includes: A left servo motor drives a rotating sleeve to rotate; A ball nut is key-connected to the rotating sleeve, and the ball nut rotates with the rotating sleeve; A ball screw is screwed to the ball nut, and the ball screw can be driven by the ball nut to perform telescopic linear motion corresponding to the inside of the ball nut; A ball spline connects the ball screw and the left central drive shaft; A spline bushing is sleeved on the ball spline and key-connected to a fixed cylinder, so that the ball spline can drive the left central drive shaft to perform linear motion in the left-right direction, enabling the left cone head to perform linear motion displacement in the left conical hole in the left-right direction, and further expanding or shrinking the outer diameter of the left expandable head.

6. The hollow strip object cutting mechanism according to claim 1, characterized in that, It further includes: A feeding side clamp is arranged on the right side of the cutting position; A discharging side clamp is arranged on the left side of the cutting position; All cutter pressure release mechanisms are arranged in the cutting part. The cutter pressure release mechanism includes a right elastic member and a left elastic member, which are pre-compressed and stored with energy when the cutter does not cut the hollow strip object; when the cutter starts to cut the hollow strip object, the right elastic member and the left elastic member release the elastic force of the compressed stored energy to the bottom edges of the feeding-side clamp and the discharging-side clamp, so as to increase the crack at the cutting position of the hollow strip object; when the cutting depth of the cutter cutting the hollow strip object deepens, the right elastic member and the left elastic member release corresponding elastic pressures to the feeding-side clamp and the discharging-side clamp according to the cutting depth of the cutter.

7. The hollow strip-shaped object cutting mechanism according to claim 6, characterized in that, The cutter pressure release mechanism includes: The feeding-side clamp is connected to a right positioning plate through a right rotation center; A right crankshaft is located at the bottom of the feeding-side clamp; A right crankshaft connecting rod is arranged between the feeding-side clamp and the right crankshaft, and the right crankshaft connecting rod combines with the right elastic member; A right servo motor is connected to the right crankshaft to drive the right crankshaft to rotate; The discharging-side clamp is connected to a left positioning plate through a left rotation center; A left crankshaft is located at the bottom of the discharging-side clamp; A left crankshaft connecting rod is arranged between the discharging-side clamp and the left crankshaft, and the left crankshaft connecting rod combines with the left elastic member; A left servo motor is connected to the left crankshaft to drive the left crankshaft to rotate.

8. A method for cutting a hollow rolled strip object, characterized in that, When a cutter of a hollow strip object cutting mechanism cuts a hollow strip object, applying an elastic force of pre-compressed stored energy to the cutting position of the hollow strip object, the method includes the following steps: (a) Arranging a feeding-side clamp on the right side of the cutting position to clamp the hollow strip object; (b) Arranging a discharging-side clamp on the left side of the cutting position to clamp the hollow strip object; (c) When the cutter does not cut the hollow strip object, performing a cutter pressure release process to pre-compress and store energy in a right elastic member and a left elastic member; (d) When the cutter starts to cut the hollow strip object, the right elastic member and the left elastic member respectively release the elastic force of the compressed stored energy to the bottom edges of the feeding-side clamp and the discharging-side clamp, so as to increase the crack at the cutting position of the hollow strip object; (e) When the cutting depth of the cutter cutting the hollow strip object deepens, the right elastic member and the left elastic member release corresponding elastic pressures to the feeding-side clamp and the discharging-side clamp according to the cutting depth of the cutter.

9. The method for cutting a hollow coiled strip object according to claim 8, characterized in that The cutter pressure release process described in step (c) includes the following steps: (c1) Arranging a right crankshaft at the bottom of the feeding-side clamp; (c2) Arranging a right crankshaft connecting rod between the feeding-side clamp and the right crankshaft, and the right crankshaft connecting rod combines with the right elastic member; (c3) Connecting a right servo motor to the right crankshaft to drive the right crankshaft to rotate; (c4) Arranging a left crankshaft at the bottom of the discharging-side clamp; (c5) Arrange a left crankshaft connecting rod between the discharge side fixture and the left crankshaft, and the left crankshaft connecting rod is combined with the left elastic member; (c6) A left servo motor is connected to the left crankshaft to drive the left crankshaft to rotate.

10. A method for cutting a hollow rolled strip object, characterized in that, For trimming the reverse curling deformation generated at the hole edge of a hollow coiled strip object after being cut by a cutter of a hollow coiled strip object cutting mechanism, the hollow coiled strip object cutting mechanism includes a cutting portion; a feeding side; a discharging side; a pushing plate arranged on the feeding side; a feeding side plug shaft assembly arranged on the feeding side, the feeding side plug shaft assembly includes a right expandable head that can be inserted into the hollow hole of the hollow coiled strip object, and the right expandable head can be controlled to be in an expanded state or a contracted state; a discharging side plug shaft assembly arranged on the discharging side, the discharging side plug shaft assembly includes a left expandable head that can be inserted into the hollow hole of the hollow coiled strip object, and the left expandable head can be controlled to be in an expanded state or a contracted state. The method includes the following steps: (a) After the cutter completes cutting the hollow coiled strip object at a cutting position, the cutter rises; the left cone head retreats, causing the outer diameter of the left expandable head to shrink; The outer diameter of the right expandable head remains in an expanded state; the pushing plate pushes the hollow coiled strip object to the left by a predetermined length; (b) The left cone head moves to the right to expand the outer diameter of the left expandable head; at this time, the outer diameter of the right expandable head remains in an expanded state; the cutter cuts down; (c) After the cutting is completed, the cutter rises; at this time, with the hollow coiled strip object stationary, the left cone head retreats to shrink the outer diameter of the left expandable head; at this time, with the outer diameter of the right expandable head in an expanded state, the right expandable head moves to the left across the cutting position, and trims the front reverse curling deformation of the front hole edge of the hollow coiled strip object through the outer ring edge of the right expandable head; (d) The pushing plate pushes the hollow coiled strip object to the left by a predetermined length; During the process that the hollow coiled strip object is pushed to the left and exceeds the stroke of the left expandable head, the rear reverse curling deformation of the rear hole edge of the hollow coiled strip object is trimmed through the outer ring edge of the left expandable head; (e) When the hollow coiled strip object is pushed to the left to reach a predetermined length at the cutting position, the pushing plate stops pushing; the left cone head moves to the right to expand the outer diameter of the left expandable head; at this time, the outer diameter of the right expandable head remains in an expanded state; (f) Repeat steps (a) to (e) in a loop until the cutting of the entire hollow coiled strip object is completed.

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