A self-weight eccentricity compensation device for a variable width printing roller

Abstract

The utility model relates to the technical field of variable width printing roller, especially to a kind of self-weight eccentricity compensation device of variable width printing roller, including the compensation base ring of coaxial sleeve being set on printing roller core shaft, compensation base ring can rotate synchronously with core shaft;Compensation base ring is provided with two, respectively adjacent the bearing seat installation of both ends of printing roller;At least one radial compensation chamber is provided on the circumference of each compensation base ring;One counterweight that can move along the radial direction is provided in each compensation chamber;Counterweight is connected with the radial adjustment mechanism that drives its radial movement and can be locked at target position;The control end of radial adjustment mechanism is connected with the signal of detection unit for obtaining the eccentricity phase and amplitude of printing roller;Counterweight is provided with the guide portion extending along the radial direction, and compensation chamber is provided with the guide structure matched with guide portion;It can adjust counterweight according to printing roller eccentricity information, realize the dynamic balance compensation of variable width printing roller, to improve printing precision and efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of variable width printing rollers, and in particular to a self-weight eccentricity compensation device for variable width printing rollers. Background Technology

[0002] Printing rollers are core components of printing machinery, primarily used for impression, inking, and ink transfer. To accommodate printing materials of different sizes, the width of printing rollers is designed to be adjustable. This means the printing roller consists of a central spindle and multiple roller sleeve units that can slide and lock along the spindle axis. The actual printing width is changed by adding or removing the number of roller sleeve units. The overall structure is not completely continuous, resulting in uneven mass distribution and a misalignment between the center of gravity and the theoretical center of rotation. This eccentricity, caused by the structure itself and its own weight, generates periodic centrifugal force and vibration when the printing roller rotates at high speed. This vibration is directly transmitted to the printing plate, leading to quality defects such as ink streaks and ghosting, affecting printing accuracy and stability. Dynamic balancing of fixed rollers is common, usually achieved by placing balancing discs at both ends of the roller or drilling holes in the roller to remove weight. However, for variable width printing rollers, the mass distribution changes with width adjustment, and traditional fixed balancing methods cannot adapt to this change. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a self-weight eccentricity compensation device for a variable width printing roller that can achieve automatic compensation.

[0004] This utility model discloses a self-weight eccentricity compensation device for a variable width printing roller, comprising a compensation base ring coaxially sleeved on the printing roller mandrel, the compensation base ring being able to rotate synchronously with the mandrel; two compensation base rings are provided, respectively installed adjacent to the bearing seats at both ends of the printing roller; each compensation base ring is provided with at least one radial compensation chamber in its circumferential direction; each compensation chamber is provided with a counterweight block that can move radially; the counterweight block is connected to a radial adjustment mechanism that drives its radial movement and can lock it at a target position; the control end of the radial adjustment mechanism is connected to a detection unit signal for acquiring the eccentricity phase and amplitude of the printing roller; the counterweight block is provided with a radially extending guide portion, and the compensation chamber is provided with a guide structure that cooperates with the guide portion.

[0005] As a preferred embodiment of this utility model, the radial adjustment mechanism includes an adjusting screw disposed in the compensation chamber, the axis of the adjusting screw being parallel to the radial direction of the compensation base ring; the counterweight and the adjusting screw are connected by a threaded pair; one end of the adjusting screw extends out of the compensation base ring and is connected to a control part for driving its rotation angle adjustment and locking.

[0006] As a preferred embodiment of this utility model, the control unit includes a worm gear fixedly connected to the end of the adjusting screw, and a worm meshing with the worm gear; the shaft end of the worm is provided with an interface for driving and locking.

[0007] As a preferred embodiment of this utility model, the radial adjustment mechanism is a linear drive element, the cylinder or stator of the linear drive element is fixed in the compensation chamber, and its push rod or mover is connected to the counterweight.

[0008] As a preferred embodiment of this utility model, the linear drive element is an electric actuator, a servo cylinder, or a piezoelectric actuator.

[0009] As a preferred embodiment of this utility model, a scale is provided on the radial movement trajectory of the counterweight.

[0010] As a preferred embodiment of this utility model, the number of compensation chambers and counterweights is two, and they are arranged symmetrically about the rotation center of the compensation base ring.

[0011] As a preferred embodiment of this utility model, the axes of the two compensation chambers are located in the same radial plane of the compensation base ring, or are staggered along the axial direction.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a compensation base ring that can rotate synchronously with the printing roller and its internal radially adjustable counterweight, the position of the counterweight can be adjusted according to the real-time eccentricity information obtained by the detection unit to counteract the centrifugal force caused by uneven mass distribution due to changes in the width of the printing roller. This achieves compensation for the eccentricity of the variable width printing roller's own weight, thereby improving adjustment efficiency and production continuity, and ultimately enhancing printing accuracy and stability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ; Figure 2 This is a cross-sectional view of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the structure of this utility model. Figure 2 ; Figure 4 This is a cross-sectional view of the present invention. Figure 2 ; The following labels are used in the attached diagram: 1. Compensation base ring; 11. Compensation chamber; 111. Guide structure; 12. Counterweight; 121. Guide part; 2. Radial adjustment mechanism; 21. Adjusting screw; 3. Control part; 31. Worm gear; 32. Worm; 33. Interface; 4. Linear drive element; 5. Scale. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Reference Figures 1-4 This embodiment provides a self-weight eccentricity compensation device for a variable width printing roller, including a compensation base ring 1 coaxially sleeved on the printing roller mandrel; the compensation base ring 1 and the mandrel can be synchronously rotated by means of key connection, interference fit or flange fastening; two compensation base rings 1 are provided, respectively installed near the bearing seats at both ends of the printing roller, so that the eccentric components at both ends of the roller body can be independently corrected; each compensation base ring 1 has at least one radial compensation chamber 11 machined in the circumferential direction; each compensation chamber 11 contains a counterweight block 12 that can move radially along the compensation base ring 1, and the magnitude of the centrifugal force generated by the counterweight block 12 during rotation can be changed by changing the radial position of the counterweight block 12; the counterweight block 12 is provided with a radially extending guide portion 121, such as a guide rail or guide ridge. Alternatively, a guide groove may be provided; correspondingly, a matching guide structure 111, such as a slide, slide rail, or guide hole, is provided in the compensation chamber 11. This guide matching ensures that the counterweight 12 can only move smoothly along a predetermined radial trajectory without circumferential deflection or jamming. The counterweight 12 is connected to a radial adjustment mechanism 2, which can drive the counterweight 12 to move radially and can lock it firmly after it moves to the target position. The control end of the radial adjustment mechanism 2 is connected to the detection unit. The detection unit is used to acquire the eccentric phase and amplitude information of the printing roller under a specific width in real time or periodically. It can be a vibration sensor, displacement sensor, or a dedicated dynamic balancing detector. Based on the detected eccentric data, the control system can calculate the required counterweight adjustment amount and phase and issue a command to the radial adjustment mechanism 2.

[0017] The radial adjustment mechanism 2 may include an adjusting screw 21 disposed in the compensation chamber 11; the axis of the adjusting screw 21 is installed parallel to the radial direction of the compensation base ring 1; the counterweight 12 has a threaded hole machined inside, so that it forms a threaded connection with the adjusting screw 21; when the adjusting screw 21 rotates around its own axis, the counterweight 12 can be driven to move radially in a straight line through the threaded transmission; the radial displacement of the counterweight 12 can be controlled by the number of rotations of the screw, thereby controlling the compensation torque; in order to be operated from outside the compensation base ring 1, one end of the adjusting screw 21 extends out of the side wall or end face of the compensation base ring 1, and a control part 3 is connected to the outer end. The control part 3 is used to drive the adjusting screw 21 to rotate for adjustment, and can lock after adjustment.

[0018] The control unit 3 includes a worm gear 31 fixedly connected to the extended end of the adjusting screw 21, and a worm 32 meshing with the worm gear 31. The shaft end of the worm 32 is provided with an interface 33 for driving and locking. The interface 33 can be an internal hexagonal hole, a slotted slot, or a cross slot for easy operation with hand tools, or an external hexagonal head, a spline, or a coupling interface for easy connection with electric or pneumatic tools. By rotating the worm 32, the worm gear 31 and the adjusting screw 21 fixedly connected to it are driven to rotate, thereby driving the counterweight 12 to move. The worm gear transmission has a reverse self-locking characteristic, that is, the worm 32 can drive the worm gear 31, but the worm gear 31 is difficult to drive the worm 32 in the reverse direction, which can provide additional locking protection for the counterweight 12 and prevent it from drifting under the action of rotational centrifugal force.

[0019] The radial adjustment mechanism 2 can be a linear drive element 4, using components such as an electric push rod, servo cylinder, or piezoelectric actuator; its cylinder body or stator is fixed in the compensation chamber 11, and the push rod or mover is directly connected to the counterweight 12; when the linear drive element 4 is energized or a pressure medium is introduced, its push rod or mover performs linear extension and retraction, thereby directly pushing or pulling the counterweight 12 to move radially; after the detection unit detects the eccentric signal, the control system can directly control the stroke of the linear drive element 4 to quickly drive the counterweight 12 to the predetermined position.

[0020] Furthermore, a scale 5 is provided on the radial trajectory of the counterweight 12; the scale 5 can be directly engraved on the inner wall of the compensation chamber 11 or on an observation window to provide an intuitive visual reference; during manual adjustment or initial calibration, the operator can quickly and repeatedly position the counterweight 12 to a specific position according to the scale reading, simplifying the debugging process, and at the same time facilitating the recording of the position parameters of the counterweight 12 under different printing widths, so as to achieve rapid preset.

[0021] To achieve a more comprehensive and flexible balancing capability, the number of compensation chambers 11 and counterweights 12 set on each compensation base ring 1 is preferably two, and they are arranged symmetrically about the rotation center of the compensation base ring 1. When the two counterweights 12 are initially at zero position, they are located at both ends of the same diameter and their masses are balanced. By synchronously adjusting the radial position of the two symmetrical counterweights 12, the position of the composite centroid can be changed, thereby generating a net compensation centrifugal force at any desired phase and realizing vector compensation for any phase eccentricity.

[0022] The axes of the two compensation chambers 11 are located in the same radial plane of the compensation base ring 1, or are staggered along the axial direction. When the axes of the two compensation chambers 11 are located in the same radial plane of the compensation base ring 1, that is, when the two counterweights 12 are aligned in the axial direction, the compensation force generated is located in the same correction plane, and the structure is compact. When the two compensation chambers 11 are staggered along the axial direction of the compensation base ring 1, that is, when the two counterweights 12 are a certain distance apart in the axial direction, there are two correction planes with a gap in the axial direction on one base ring. The two counterweights 12 separated in the axial direction can generate a compensation torque, which can improve the balance capacity of a single compensation base ring, enabling it to cope with more complex dynamic imbalance states and enhance the compensation effect.

[0023] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model 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 solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A self-weight eccentricity compensation device for a variable width printing roller, characterized in that, The system includes a compensation base ring (1) coaxially sleeved on the printing roller mandrel, the compensation base ring (1) being able to rotate synchronously with the mandrel; two compensation base rings (1) are provided, respectively installed near the bearing seats at both ends of the printing roller; each compensation base ring (1) is provided with at least one radial compensation chamber (11) in the circumferential direction; each compensation chamber (11) is provided with a counterweight (12) that can move radially; the counterweight (12) is connected to a radial adjustment mechanism (2) that drives its radial movement and can lock at a target position; the control end of the radial adjustment mechanism (2) is connected to a detection unit signal for acquiring the eccentric phase and amplitude of the printing roller; the counterweight (12) is provided with a radially extending guide portion (121), and the compensation chamber (11) is provided with a guide structure (111) that cooperates with the guide portion (121).

2. The self-weight eccentricity compensation device for the variable width printing roller as described in claim 1, characterized in that, The radial adjustment mechanism (2) includes an adjustment screw (21) disposed in the compensation chamber (11), the axis of the adjustment screw (21) being radially parallel to the compensation base ring (1); the counterweight (12) being connected to the adjustment screw (21) via a threaded pair; one end of the adjustment screw (21) extending out of the compensation base ring (1) and connected to a control part (3) for driving its rotation angle adjustment and locking.

3. The self-weight eccentricity compensation device for the variable width printing roller as described in claim 2, characterized in that, The control unit (3) includes a worm gear (31) fixedly connected to the end of the adjusting screw (21) and a worm (32) meshing with the worm gear (31); the shaft end of the worm (32) is provided with an interface (33) for driving and locking.

4. The self-weight eccentricity compensation device for the variable width printing roller as described in claim 1, characterized in that, The radial adjustment mechanism (2) is a linear drive element (4), the cylinder or stator of the linear drive element (4) is fixed to the compensation chamber (11), and its push rod or mover is connected to the counterweight (12).

5. The self-weight eccentricity compensation device for the variable width printing roller as described in claim 4, characterized in that, The linear drive element (4) is an electric push rod, a servo cylinder, or a piezoelectric actuator.

6. The self-weight eccentricity compensation device for the variable width printing roller as described in any one of claims 1 to 5, characterized in that, The counterweight (12) is provided with a scale (5) along its radial movement trajectory.

7. The self-weight eccentricity compensation device for the variable width printing roller as described in any one of claims 1 to 5, characterized in that, The number of the compensation chamber (11) and the counterweight (12) is two, and they are arranged symmetrically about the rotation center of the compensation base ring (1).

8. The self-weight eccentricity compensation device for the variable width printing roller as described in claim 7, characterized in that, The axes of the two compensation chambers (11) are located in the same radial plane of the compensation base ring (1), or are staggered along the axial direction.

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