Middle printing roller for tin plate production

Abstract

The utility model provides a middle printing roller for tin plate production, which comprises a mandrel, the mandrel is sleeved with a plurality of moving rings, a plurality of V-shaped grooves are equidistantly formed in the circumferential surface of the mandrel, each moving ring comprises a supporting ring, a plurality of through holes are equidistantly formed in the radial direction of each supporting ring, and steel balls are arranged in the through holes. The steel balls are arranged in the V-shaped grooves in a matched mode, a groove is formed in the side wall of the supporting ring, a printing ring is arranged on the groove in a buckled mode, and the top of the edge of the printing ring is pointed and the edge of the printing ring is sharp. According to the invention, by designing the movable ring structure, the time for changing the position of the printing ring is greatly shortened, and the printing requirements of different patterns are met.

Description

Technical Field

[0001] This invention relates to the field of printing roller technology, and more particularly to a central printing roller for tinplate production. Background Technology

[0002] Tinplate is an important food packaging material. Depending on its intended use, the amount of tin plating on the surface of the tinplate varies. Furthermore, to conserve tin, the two surfaces of the tinplate may also have different amounts of tin plating, a process known as differential thickness tin plating. To facilitate manual identification of the different tin plating amounts on differential thickness tinplates, European and Chinese standards specify different printing patterns for these products. These patterns typically consist of continuous parallel lines approximately 1 mm wide and spaced no more than 75 mm apart.

[0003] The varying spacing of the printed lines on the surface of the tinplate is achieved using a central printer. This central printer consists of a dip roller, an intermediate tank, and a printing roller. The dip roller transfers the sodium dichromate solution to the intermediate roller, which then contacts the printing roller. The printing roller contacts the high-speed moving strip, printing the sodium dichromate solution onto the strip surface in linear form. These printed lines become clearly visible on the tinplate surface after a subsequent remelting process.

[0004] The currently used printing roller has grooves machined into the printing shaft with a spacing of 12.5mm. The printing shaft typically has an outer diameter of Φ238, the groove depth is 2.5mm, and the width is 10mm. The rubber printing ring fitted onto the printing shaft has an inner diameter of Φ216 and a thickness of 10mm. Therefore, to install the rubber printing ring into the groove of the printing roller, the diameter of the rubber ring needs to be increased. Once installed, the rubber ring fits tightly onto the printing roller. Different installation spacing of the rubber printing ring on the printing roller can meet the requirements of different printing line spacings. Because the printing ring is tightly attached to the groove of the printing roller, moving the rubber printing ring becomes very difficult to meet the requirements of different printing lines, making it impossible to achieve the positional requirements of moving the printing ring online.

[0005] To change the position of the rubber printing ring on the printing roller, the printing roller needs to be lifted out of the unit, and the position change of the rubber printing ring needs to be achieved offline. This offline printing ring position change mode increases the workload and the downtime of the unit. It usually takes about 4 hours to complete one printing ring position change, thus increasing the workload and causing a loss of unit capacity. Summary of the Invention

[0006] To address the aforementioned difficulties in adjusting the position of the printing roller, this invention discloses a central printing roller for tinplate production, comprising a mandrel with several movable rings sleeved on it. The movable rings are dipped in sodium dichromate solution and transferred onto the tinplate during rotation, thus printing markings. The spacing and number of the movable rings are used to indicate the amount of tin plating on the tinplate.

[0007] The mandrel has several V-shaped grooves evenly spaced on its circumference. The moving ring includes a support ring with several through holes at equal angles in its radial direction. Steel balls are placed inside the through holes and fit into the V-shaped grooves. The steel balls and V-shaped grooves enable the positioning of the moving ring. When the steel balls retract into the through holes, the position of the support ring can be easily moved, thus facilitating the adjustment of the spacing between the moving rings.

[0008] The support ring has a groove on its side wall, and a printing ring is fastened to the groove. The printing ring has a sharp, pointed edge. The printing ring is made of a flexible material, such as rubber. The printing ring is interference-fitted into the groove to ensure that the support printing ring rotates with the support ring. At the same time, the sharp, pointed edge ensures that the marking line is thin, which is achieved by using a beveled angle.

[0009] Preferably, an end cap is welded and fixed to the end of the mandrel, and a support disc is sleeved on the end cap. The end cap is used to support the mandrel and connect to related transmission structures.

[0010] Preferably, a plurality of support rods are interspersed on the support plate, the support rods passing through the support ring, and a sliding bearing is provided between the support ring and the support rods. This support rod configuration prevents slippage between the moving ring and the mandrel.

[0011] Preferably, threaded holes are provided at common locations on both the end shaft and the support plate, and countersunk studs are fitted into these threaded holes. This allows the support plate to be fixed at the end, and when adding or removing moving rings, the support plate at one end of the mandrel needs to be removed.

[0012] Preferably, a set screw is threaded into the radial through hole of the support ring, and a spring is provided between the steel ball and the set screw. Rotating the set screw controls its position in the through hole, thereby compressing or releasing the spring, which in turn generates a force on the V-groove from the steel ball, thus adjusting the ease with which the V-groove can be replaced on the moving ring.

[0013] The beneficial effects of this invention are as follows: The position of the printing ring is changed by altering the position of the moving ring. Under axial force, the steel ball inside the moving ring extends inward, allowing the moving ring to move freely on the mandrel. When the moving ring reaches the V-groove, the steel ball pops out, fixing the moving ring to the designated position, thus achieving the change of the printing ring's position. In summary, the movement of the printing ring on the printing shaft is convenient, enabling online changes to the printing ring's position and reducing the time for changing the printing ring's position to within 10 minutes. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 This is an exploded view of the present invention;

[0016] Figure 3 This is a perspective view of the movable ring of the present invention;

[0017] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0018] List of reference numerals in the attached diagram:

[0019] 1. Moving ring; 2. Support rod; 3. Mandrel; 4. Support plate; 5. End shaft head; 6. Countersunk stud;

[0020] 11. Support ring; 12. Printing ring; 13. Sliding bearing; 14. Steel ball; 15. Spring; 16. Set screw. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figures 1 to 4 As shown, a central printing roller for tinplate production includes a mandrel 3, which is a tubular component with a wall thickness of 15mm and is made of 430 stainless steel. Several movable rings 1 are sleeved on the mandrel 3.

[0023] The circumferential surface of the mandrel 3 is provided with several V-shaped grooves at equal intervals. The V-shaped grooves have a 90° opening. The distance between adjacent V-shaped grooves can be set according to printing needs. The existing spacing of the markings is 12.5mm. The moving ring 1 includes a support ring 11. The support ring 11 has several through holes at equal angles in the radial direction. Steel balls 14 are provided inside the through holes. The steel balls 14 are fitted in the V-shaped grooves. The fit of the steel balls 14 in the V-shaped grooves facilitates the change of position of the moving ring 1 and the positioning after the change of position.

[0024] The side wall of the support ring 11 has a groove, and a printing ring 12 is fastened to the groove. The printing ring 12 is made of flexible material, preferably rubber. The printing ring 12 and the groove are interference fit to ensure that the printing ring 12 can rotate with the support ring 1. The edge of the printing ring 12 is sharp and pointed to ensure that the marking line is thin enough. The chamfering is used to obtain the line.

[0025] The end of the spindle 3 is welded and fixed with an end shaft head 5, which is used for support and connection of the transmission structure. A support plate 4 is sleeved on the end shaft head 5 and the support plate 4 is fixed on the end shaft head 5.

[0026] Several support rods 2 are interspersed on the support plate 4. The support rods 2 are made of carbon steel and have chrome-plated circumference. At both ends of the support rods 2, there are studs with nuts fitted on the studs. The two nuts fix the support rods to the support plate 4. The support rods 2 pass through the support ring 11, and a sliding bearing 13 is provided between the support ring 11 and the support rods 2. The sliding bearing 13 is self-lubricating to reduce the resistance of the axial movement of the moving ring 1. The use of support rods 2 is to avoid slippage between the moving ring 1 and the spindle 3.

[0027] Both the end shaft head 5 and the support plate 4 have threaded holes at common locations. Countersunk studs 6 are fitted into the threaded holes. The countersunk studs 6 have the same diameter and an internal hexagonal groove at their ends. When adding or removing the moving ring 1, the support plate 4 needs to be removed.

[0028] A set screw 16 is threaded into the radial through hole of the support ring 11. A spring 15 is provided between the steel ball 14 and the set screw 16. The end of the set screw 16 is provided with a structure that engages with a screwdriver. By rotating the set screw 16, the preload of the spring 15 can be adjusted, that is, the force exerted by the steel ball 14 on the V-groove can be changed, thereby changing the ease with which the moving ring 1 can be repositioned, and avoiding the problem of misalignment of the moving ring 1 during equipment operation.

[0029] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A central printing roller for tinplate production, characterized in that: Includes a mandrel (3), on which several movable rings (1) are sleeved; The mandrel (3) has several V-shaped grooves evenly spaced on its circumferential surface. The moving ring (1) includes a support ring (11). The support ring (11) has several through holes at equal angles in its radial direction. Steel balls (14) are arranged inside the through holes and fit into the V-shaped grooves. The side wall of the support ring (11) is provided with a groove, and a printing ring (12) is fastened on the groove, and the top edge of the printing ring (12) is set with a sharp angle.

2. The central printing roller for tinplate production according to claim 1, characterized in that: The end of the mandrel (3) is welded and fixed with an end shaft head (5), and a support plate (4) is sleeved on the end shaft head (5).

3. The central printing roller for tinplate production according to claim 2, characterized in that: A number of support rods (2) are interspersed on the support plate (4), the support rods (2) pass through the support ring (11), and a sliding bearing (13) is provided between the support ring (11) and the support rods (2).

4. The central printing roller for tinplate production according to claim 2, characterized in that: Both the end shaft head (5) and the support plate (4) have threaded holes at their common positions, and countersunk studs (6) are fitted into the threaded holes.

5. The central printing roller for tinplate production according to claim 1, characterized in that: The support ring (11) has a threaded connection of a set screw (16) in the radial through hole, and a spring (15) is provided between the steel ball (14) and the set screw (16).

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