A rod fabric tensioning device with adjustable pre-bend

Abstract

The present application belongs to the technical field of cutting bed equipment, and particularly relates to a rod type fabric tensioning device with adjustable pre-bending degree. The present application provides a rod type fabric tensioning device with adjustable pre-bending degree, which is directed to the asymmetric relaxation phenomenon in a cloth roll and comprises a rack, a tensioning rod, a pre-bending adjusting mechanism and a mounting and fixing component, so that the present application can apply adjustable pre-bending deformation at a specific position according to the actual tightness of cloth, and meanwhile, the lifting adjusting and yawing rotation functions are matched to realize accurate flattening and deviation correction of cloth.

Description

Technical Field

[0001] This invention belongs to the technical field of cutting bed equipment, and particularly relates to a rod-type fabric tensioning device with adjustable pre-bending. Background Technology

[0002] In actual production, various problems often arise before the fabric roll enters the cutting machine table after being unrolled, affecting cutting accuracy. Among these, the most common problem is the "flared end" phenomenon of the fabric roll. A "flared end" refers to a situation where uneven tension during the winding process causes inconsistent tightness across the fabric roll, resulting in one end being loose and the other tight. When such a roll is unrolled, the looser side sags more, while the tighter side is relatively straight, presenting an irregular, flared shape. If this type of fabric is fed directly into the cutting machine, it will result in uneven fabric distribution on the table, leading to errors during cutting. In severe cases, it can even cause skewed cutting lines and substandard cut pieces.

[0003] For example, Chinese utility model patent CN 212199786 U, published on December 22, 2020, discloses a dust removal and material spreading device for a cutting machine. This device has a guide rod, an arched tensioning rod, and a dust removal brush fixed between the material roll supports. The fabric is flattened by the arched support of the tensioning rod. However, the arched tensioning rod in this device has a fixed curvature and cannot be adjusted according to the actual tightness of the fabric. When the tightness distribution of the fabric does not match the curvature of the arched rod, the flattening effect is greatly reduced.

[0004] In addition, some high-end cutting machines use complex double-roller correction devices, which use two coaxial rollers to rotate relative to each other to correct and flatten the fabric. However, this method aims to move the fabric that has deviated from the center line back to the center line as a whole. For fabrics that are not symmetrical in their own way, the improvement effect is extremely poor.

[0005] Therefore, the existing technology still has at least the following shortcomings in actual use, which are the technical problems that the present invention aims to solve: 1. It cannot make precise local adjustments for the problem of asymmetrical slack in the fabric roll; 2. Simple height compensation will lead to new technical problems and cause offset.

[0006] In conclusion, it is necessary to develop a tensioning device that can address the problem of asymmetrical fabric slack. Summary of the Invention

[0007] This invention provides an adjustable pre-bending rod-type fabric tensioning device to address asymmetrical slack in fabric rolls. The device includes a frame, a tensioning rod, a pre-bending adjustment mechanism, and mounting and fixing components. This allows the invention to apply adjustable pre-bending deformation at specific locations based on the actual tension of the fabric. Simultaneously, in conjunction with lifting adjustment and yaw rotation functions, it achieves precise flattening and correction of the fabric.

[0008] This invention overcomes the shortcomings of the prior art and provides an adjustable pre-bending rod-type fabric tensioning device, comprising: a frame; a tensioning rod, which is an elastic cylinder with both ends mounted on the frame; a pre-bending adjustment mechanism, including a guide rail mounted on the frame and located directly below the tensioning rod, a frame slidably mounted on the guide rail, a first screw jack mounted above the frame, a first lifting plate mounted on the output end of the first screw jack, a push block mounted on the first lifting plate, and a first motor for driving the frame to slide, the push block having a U-shaped upper arc surface with an opening facing the tensioning rod and covering the middle of the tensioning rod; and mounting and fixing components, including a fixing member mounted on one side of the frame for mounting the fixed end of the tensioning rod, and a lifting and deflection adjustment member mounted on the other side of the frame for mounting the movable end of the tensioning rod.

[0009] A further preferred technical solution is that the lifting and deflection adjustment component includes a mounting cavity disposed on the side plate of the frame, a second screw jack disposed on the bottom surface of the mounting cavity, a second lifting plate disposed on the output end of the second screw jack, a guide rod vertically disposed on the bottom surface of the mounting cavity and passing through the second lifting plate, a rotary table disposed on the second lifting plate via a planar thrust roller bearing, a gear disposed on the bottom surface of the rotary table, a worm gear disposed on the second lifting plate and meshing with the gear, a second motor disposed at the end of the worm gear, and a first self-aligning bearing disposed on the upper surface of the rotary table for mounting the tensioning rod.

[0010] A further preferred technical solution is that the fixing component includes a second self-aligning bearing disposed on the side plate of the frame, a sliding sleeve pressed into the second self-aligning bearing, and a tensioning rod inserted into the sliding sleeve with an axial clearance.

[0011] A further preferred technical solution is that the pre-bending adjustment mechanism further includes a deflector for adapting to the deflection of the tension rod. The deflector includes a rotating chassis disposed between the first lifting plate and the push block, a central shaft disposed above the first lifting plate, a sleeve shaft disposed below the rotating chassis and connected to the central shaft via a bearing, and an elongated groove disposed above the rotating chassis and used for slidingly mounting the push block.

[0012] A further preferred technical solution is that multiple sets of angular contact ball bearings are provided between the rotary table and the second lifting plate.

[0013] A further preferred technical solution is that: a ball bearing is provided inside the U-shaped upper arc surface of the pusher block.

[0014] A further preferred technical solution is that the tensioning rod is a carbon fiber tube.

[0015] A further preferred technical solution is that the tensioning rod comprises a metal inner tube and a carbon fiber outer tube.

[0016] A further preferred technical solution includes a control system and at least two guide rollers respectively disposed in front of and behind the tension rod. The control system includes a tension sensor disposed on the guide rollers, a photoelectric sensor for monitoring the fabric edge offset, and a controller for receiving signals from the tension sensor and the photoelectric sensor and controlling the first screw jack, the second screw jack, the first motor, and the second motor.

[0017] The beneficial effects of this invention are at least as follows: 1. It enables independent adjustment of the pre-bending position and degree of the tension rod, allowing for precise adjustment to address local or unilateral slack in the fabric, thus exhibiting strong adaptability; 2. It integrates multiple functions such as lifting adjustment, yaw correction, and pre-bending adjustment, jointly solving various problems such as fabric flaring, deviation, and local wrinkles; 3. An optional sensor system can be added to achieve closed-loop control, resulting in a high degree of automation, high adjustment accuracy, and fast response speed. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the invention in its initial state; Figure 2 This is a front view of the invention in its pre-bent state; Figure 3 This is a partial schematic diagram of the pre-bending adjustment mechanism of the present invention; Figure 4 This is a partial schematic diagram of the lifting and deflection adjustment component of the present invention; Figure 5 This is a partial schematic diagram of the fastener of the present invention.

[0020] The meanings of the various reference numerals in the figure are as follows: Frame 1, tension rod 2, pre-bending adjustment mechanism 3, mounting and fixing components 4, guide roller 5; Guide rail 31, frame 32, first screw jack 33, first lifting plate 34, push block 35, first motor 36, deflector 37, ball bearing 38, fixing component 41, lifting and deflection adjustment component 42; Rotating chassis 371, central shaft 372, sleeve shaft 373, long groove 374, second self-aligning bearing 411, sliding sleeve 412, mounting cavity 421, second screw jack 422, second lifting plate 423, guide rod 424, rotary table 425, gear 426, worm gear 427, second motor 428, first self-aligning bearing 429. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc., mentioned or possibly mentioned in this specification are defined relative to the structure shown in the accompanying drawings. The terms "inner" and "outer" refer to the direction toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0023] As attached Figures 1-5 As shown, an adjustable pre-bending rod-type fabric tensioning device includes: a frame 1; a tensioning rod 2, which is an elastic cylinder with both ends mounted on the frame 1; a pre-bending adjustment mechanism 3, including a guide rail 31 mounted on the frame 1 and located directly below the tensioning rod 2, a frame 32 slidably mounted on the guide rail 31, a first screw jack 33 mounted above the frame 32, a first lifting plate 34 mounted on the output end of the first screw jack 33, a push block 35 mounted on the first lifting plate 34, and a first motor 36 for driving the frame 32 to slide, the push block 35 having an opening facing the tensioning rod 2 and covering the middle of the tensioning rod 2; and a mounting and fixing component 4, including a fixing component 41 mounted on one side of the frame 1 for mounting the fixed end of the tensioning rod 2, and a lifting and deflection adjustment component 42 mounted on the other side of the frame 1 for mounting the movable end of the tensioning rod 2.

[0024] In this embodiment, the frame is welded from steel and has a portal frame structure. The height of the two side columns can be adjusted according to the height of the cutting bed on site. Mounting holes are pre-drilled on the crossbeams for fixing the tension rod and the pre-bending adjustment mechanism. The tension rod is an elastic cylindrical rod, horizontally mounted on the frame, perpendicular to the fabric conveying direction. Both ends are connected to the frame via the mounting and fixing components. The surface of the tension rod is tightly covered with a thick-walled polytetrafluoroethylene tube, or it is hard chrome plated and polished to reduce fabric friction damage. The pre-bending adjustment mechanism is mounted on the frame and located below the tensioning rod. The guide rail is installed parallel to the tensioning rod below, and its length covers more than 80% of the effective working area of ​​the tensioning rod. The frame can slide freely along the guide rail under the drive of the first motor to change the position of the thrust application. The first screw jack is located above the frame, and the lifting screw is installed vertically below the push block. By rotating, the push block is driven to push the tensioning rod upward, thereby achieving precise control of the pre-bending degree. The contact surface of the push block adopts an arc design to match the bending of the rod. This mechanism allows the pre-bending position and pre-bending degree to be adjusted independently, forming an asymmetrical bending shape.

[0025] The mounting and fixing components include a fixing member disposed at the fixed end of the tension rod and a lifting and deflection adjusting member disposed at the movable end of the tension rod. The fixing member adopts a relatively fixed design, with its height fixed on the frame, serving as a spatial positioning reference for the tension rod. The lifting and deflection adjusting member has lifting and yaw adjustment functions, allowing one end of the tension rod to be adjusted in height and angle within a small range to adapt to and correct the direction of the fabric.

[0026] The working principle of this embodiment is as follows: First, based on the distribution of fabric tension, determine the location where pre-bending needs to be applied. Drive the frame to the target position, then drive the push block to gradually rise, pressing against the tension rod. As the push block rises, the tension rod undergoes upward bending deformation at the push block position, forming a pre-bending arc. The magnitude of the pre-bending arc is proportional to the rising height of the push block. Through the above operation, the operator can apply various degrees of pre-bending deformation at multiple locations on the tension rod, thereby correspondingly compensating for local differences in fabric tension.

[0027] In a preferred embodiment, the lifting and deflection adjusting component 42 includes a mounting cavity 421 disposed on the side plate of the frame 1, a second screw jack 422 disposed on the bottom surface of the mounting cavity 421, a second lifting plate 423 disposed on the output end of the second screw jack 422, a guide rod 424 vertically disposed on the bottom surface of the mounting cavity 421 and passing through the second lifting plate 423, a rotary disk 425 disposed on the second lifting plate 423 via a planar thrust roller bearing, a gear 426 disposed on the lower bottom surface of the rotary disk 425, a worm gear 427 disposed on the second lifting plate 423 and meshing with the gear 426, a second motor 428 disposed at the end of the worm gear 427, and a first self-aligning bearing 429 disposed on the upper surface of the rotary disk 425 for mounting the tensioning rod 2.

[0028] In this embodiment, the lifting and deflection adjustment component is functionally divided into four layers. The first layer is the base fixing layer, where a metal mounting cavity facing the tension rod is welded to the side of the column on one side of the frame. Two guide rods are vertically installed on the inner bottom surface of the mounting cavity, and a lifting screw is vertically installed in the middle of the two guide rods. The bottom of the lifting screw is connected to a motor to form a second screw jack. The second layer is the translation lifting layer, which includes a thick horizontal metal base plate as the second lifting plate. The two guide rods pass through the two sides of the second lifting plate, and screw nuts are installed inside to engage with the lifting screw. When the lifting screw rotates, the lifting slide is forced to move upward or downward. The third layer is the micro-yaw rotation layer, which is directly installed above the second lifting plate. A planar thrust roller bearing is placed, and a rotary disk is placed above the planar thrust roller bearing. A central pin passes through the rotary disk and is vertically inserted into the second lifting plate below, serving as the center of rotation. A gear is directly machined on the bottom surface of the rotary disk. A worm gear is horizontally installed on the second lifting plate, and the thread of the worm gear meshes with the gear of the rotary disk. A small stepper motor or servo motor is installed at the end of the worm gear as a second motor to control the forward or reverse rotation of the motor, which will cause the rotary disk to rotate slightly to the left or right. The fourth layer is a support layer. A self-aligning bearing with a seat is bolted to the top surface of the rotary disk. The end of the tensioning rod is inserted into the first self-aligning bearing, with a few millimeters of axial sliding clearance to release the stress caused by the length change when the rod bends and is raised.

[0029] The working principle of the lifting and deflection adjustment component is as follows: When it is necessary to adjust the height of the movable end of the tension rod, the second screw jack is controlled to rotate, driving the lifting screw to rotate. The second lifting plate, together with all the components above it, rises or falls together, and the movable end of the tension rod is raised or lowered accordingly, forming a slight tilt state, thereby compensating for the tension difference on both sides of the fabric.

[0030] When it is necessary to adjust the yaw angle of the tension rod, the second motor is controlled to rotate, driving the worm gear to rotate. The rotary table then rotates slightly to the left or right, and the movable end of the tension rod deflects at a small angle in the horizontal plane, generating a lateral guiding force on the fabric to correct the fabric's deviation.

[0031] As a preferred embodiment, the fixing member 41 includes a second self-aligning bearing 411 disposed on the side plate of the frame 1, a sliding sleeve 412 pressed into the second self-aligning bearing 411, and the tensioning rod 2 inserted into the sliding sleeve 412 with an axial clearance.

[0032] In this embodiment, a self-aligning ball bearing or a spherical plain bearing is installed on the side plate on the other side of the frame to absorb the angular tilt caused by the bending and lifting of the rod. A metal sleeve with a deep cylindrical inner hole is press-fitted into the inner ring of the second self-aligning bearing. The surface of the inner hole is inlaid with a self-lubricating graphite copper sleeve or a Teflon wear-resistant layer. The fixed end of the tensioning rod is machined into a smooth, surface-hardened and polished solid cylindrical steel shaft. The outer diameter of the steel shaft and the inner diameter of the sleeve form a precision sliding fit. When the machine is in a horizontal, unbent initial state, the fixed end of the tensioning rod is inserted into the sleeve, leaving an axial clearance for the rod end deep in the sleeve hole. When the movable end of the tensioning rod is raised, the rod body forms a bevel, the length of which is greater than the horizontal length. The fixed end can slide outward within the sleeve, releasing the stress caused by the length change.

[0033] As a preferred embodiment, the pre-bending adjustment mechanism 3 further includes a deflector 37 for adapting to the deflection of the tension rod 2. The deflector 37 includes a rotating base 371 disposed between the first lifting plate 34 and the push block 35, a central shaft 372 disposed above the first lifting plate 34, a sleeve shaft 373 disposed below the rotating base 371 and connected to the central shaft 372 via a bearing, and an elongated groove 374 disposed above the rotating base 371 and used for slidingly mounting the push block 35.

[0034] In this embodiment, since the tension rod is parallel to the guide rail in its undeflected state, but when the fabric edge shifts after the angle is raised, the tension rod needs to deflect slightly. At this time, the guide rail and the tension rod are no longer parallel. Therefore, a directional component is added to passively adapt to the deflection of the tension rod. Because the depth of the U-shaped upper arc surface of the push block exceeds the center of the tension rod, when one end of the tension rod yaws, the push block and the tension plate are always in close contact. The U-shaped upper arc surface above the push block causes the push block to slide in the long groove when the tension rod deflects, and drives the rotating chassis to rotate. To further increase the stability of rotation, an auxiliary block is provided at the lower end of the rotating chassis to slide in the annular groove on the upper surface of the first lifting plate.

[0035] As a preferred embodiment, multiple sets of angular contact ball bearings are provided between the rotary table 425 and the second lifting plate 423.

[0036] In this embodiment, four sets of angular contact ball bearings are added in four directions below the turntable as anti-tipping supports.

[0037] As a preferred embodiment, the pusher block 35 is provided with ball bearings 38 inside the U-shaped upper arc surface.

[0038] In this embodiment, multiple hemispherical recesses are formed on the U-shaped upper arc surface of the push block, with a ball bearing placed in each recess. The edges of the recesses have a tapering structure to prevent the ball bearing from falling out. The ball bearing is made of bearing steel and contacts the lower surface of the tensioning rod. When the tensioning rod rotates in the horizontal plane, the push block needs to slide along the tensioning rod to adapt to the deflection. The ball bearings create rolling friction between the push block and the tensioning rod, ensuring smooth yaw adjustment.

[0039] As a preferred embodiment, the tensioning rod 2 is a carbon fiber tube or includes a metal inner tube and a carbon fiber outer tube.

[0040] In this embodiment, the inner metal tube of the tensioning rod is an aluminum alloy tube, and the outer surface is wrapped with carbon fiber prepreg to form a carbon fiber outer coating layer, or the entire rod is made of carbon fiber composite material. Compared with steel, it can withstand high-frequency alternating stress, is not prone to fatigue fracture, and is lightweight. Furthermore, the stiffness can be flexibly adjusted by controlling the material ratio.

[0041] As a preferred embodiment, the system further includes a control system and at least two guide rollers 5 respectively disposed in front of and behind the tensioning rod 2. The control system includes a tension sensor disposed on the guide rollers 5, a photoelectric sensor for monitoring the fabric edge offset, and a controller for receiving signals from the tension sensor and the photoelectric sensor and controlling the first screw jack 33, the second screw jack 422, the first motor 36, and the second motor 428.

[0042] In this embodiment, the guide rollers are installed in front of (feeding side) and behind (discharge side) the tensioning rod. The roller body is made of rigid stainless steel tubing to ensure that the measurement accuracy is not affected by roller deformation. Tension sensors are installed at both ends of each guide roller. A photoelectric sensor is installed behind the tensioning rod at the position where it will enter the cutting bed. It adopts the photoelectric detection principle. When the fabric edge blocks the light beam, the receiver output signal changes, thereby detecting the position of the fabric edge. The controller has an analog input module and a digital output module. The linkage control logic is as follows: When the tension sensor detects that the tension on one side is less than the tension on the other side and exceeds the set threshold, the controller controls the second screw jack to rotate, raising one end of the tensioning rod until the tension difference between the two sides is less than the threshold. Since raising the tensioning rod will cause the fabric to deviate, when the photoelectric sensor detects that the fabric deviation exceeds the set threshold, the controller controls the second motor to rotate, causing the movable end of the tensioning rod to deflect by a corresponding small angle, generating a lateral force on the fabric to correct the deviation.

[0043] The screw jack, tension sensor, photoelectric sensor, motor, controller, etc. in the above embodiments are common knowledge known to those skilled in the art, and therefore will not be described in detail.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A rod-type fabric tensioning device with adjustable pre-bending, characterized in that, include: Rack (1); Tensioning rod (2), the tensioning rod (2) is an elastic cylinder, and both ends are installed on the frame (1); The pre-bending adjustment mechanism (3) includes a guide rail (31) mounted on the frame (1) and located directly below the tension rod (2), a frame (32) slidably mounted on the guide rail (31), a first screw jack (33) mounted above the frame (32), a first lifting plate (34) mounted on the output end of the first screw jack (33), a push block (35) mounted on the first lifting plate (34), and a first motor (36) for driving the frame (32) to slide. The push block (35) has an opening facing the tension rod (2) and a U-shaped upper arc surface covering the middle of the tension rod (2). The mounting and fixing components (4) include a fixing member (41) disposed on one side of the frame (1) for mounting the fixed end of the tension rod (2), and a lifting and deflection adjusting member (42) disposed on the other side of the frame (1) for mounting the movable end of the tension rod (2).

2. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, The lifting and deflection adjustment component (42) includes a mounting cavity (421) on the side plate of the frame (1), a second screw jack (422) on the bottom surface of the mounting cavity (421), a second lifting plate (423) on the output end of the second screw jack (422), a guide rod (424) vertically mounted on the bottom surface of the mounting cavity (421) and passing through the second lifting plate (423), a rotary disk (425) mounted on the second lifting plate (423) via a planar thrust roller bearing, a gear (426) on the bottom surface of the rotary disk (425), a worm gear (427) mounted on the second lifting plate (423) and meshing with the gear (426), a second motor (428) at the end of the worm gear (427), and a first self-aligning bearing (429) mounted on the upper surface of the rotary disk (425) for mounting the tension rod (2).

3. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, The fixing component (41) includes a second self-aligning bearing (411) disposed on the side plate of the frame (1), a sliding sleeve (412) pressed into the second self-aligning bearing (411), and the tensioning rod (2) inserted into the sliding sleeve (412) with an axial clearance.

4. The adjustable pre-bending rod-type fabric tensioning device according to claim 2, characterized in that, The pre-bending adjustment mechanism (3) further includes a deflector (37) for adapting to the deflection of the tension rod (2). The deflector (37) includes a rotating base (371) disposed between the first lifting plate (34) and the push block (35), a central shaft (372) disposed above the first lifting plate (34), a sleeve shaft (373) disposed below the rotating base (371) and connected to the central shaft (372) by a bearing, and an elongated groove (374) disposed above the rotating base (371) for slidingly mounting the push block (35).

5. The adjustable pre-bending rod-type fabric tensioning device according to claim 2, characterized in that, Multiple sets of angular contact ball bearings are provided between the rotary table (425) and the second lifting plate (423).

6. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, The pusher block (35) has a ball bearing (38) inside its U-shaped upper arc surface.

7. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, The tensioning rod (2) is a carbon fiber tube.

8. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, The tensioning rod (2) includes a metal inner tube and a carbon fiber outer tube.

9. The adjustable pre-bending rod-type fabric tensioning device according to claim 1, characterized in that, It also includes a control system and at least two guide rollers (5) respectively disposed in front of and behind the tension rod (2). The control system includes a tension sensor disposed on the guide roller (5), a photoelectric sensor for monitoring the fabric edge offset, and a controller for receiving the signals from the tension sensor and the photoelectric sensor and controlling the first screw jack (33), the second screw jack (422), the first motor (36), and the second motor (428).

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