Axial fine adjustment device for a gravure printing machine cylinder

Abstract

The utility model discloses a kind of gravure printing machine plate roller axial fine adjustment devices, it is related to printing maintenance equipment technical field, to solve the problem of the mechanical positioning component long-time use is easy to wear in the process of using traditional axial fine adjustment device, further lead to the axial clearance of plate roller, affect printing precision, including plate roller assembly, adjusting assembly and compensation assembly;The plate roller assembly includes base, the vertical plate of being set at the top of base both sides, the rotating shaft of being set between vertical plate, the plate roller main body of being set at the surface of rotating shaft;The adjusting assembly is set at the side of vertical plate;The compensation assembly includes the hydraulic oil cylinder of being set at the top of base both sides, the floating joint of being set at the output end of hydraulic oil cylinder top, the thrust bearing of being set at the top of floating joint and being connected at the surface of rotating shaft. The utility model passes through design compensation assembly, effectively avoid the pattern misregistration, color overlapping problem caused by wear gap, guarantee the consistency of printed matter overprint precision.

Description

Technical Field

[0001] This utility model relates to the field of printing maintenance equipment technology, and more specifically, to a gravure printing press roller axial fine adjustment device. Background Technology

[0002] In gravure printing, the printing roller, as a core printing component, directly determines the registration accuracy and pattern integrity of the printed product, especially in multi-color printing processes. Even a micron-level axial deviation can lead to quality problems such as pattern misalignment and color overlap, seriously affecting the product qualification rate. With the increasing demands for printing precision in industries such as packaging and publishing (e.g., fine patterns on food packaging and color reproduction in high-end brochures), the market has set higher standards for the precision, stability, and operational efficiency of printing roller axial adjustment devices.

[0003] In traditional axial fine-adjustment devices, mechanical positioning components such as the drive disc and drive shaft groove, lead screw nut, etc., will wear down over time, resulting in axial gaps in the printing roller. These gaps will affect printing accuracy and cause misregistration. Based on the above problems, we propose an axial fine-adjustment device for the printing roller of a gravure printing machine. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide an axial fine adjustment device for the printing roller of a gravure printing machine. This solves the problem that in the process of using traditional axial fine adjustment devices, the mechanical positioning components are prone to wear after long-term use, which leads to axial gaps in the printing roller and affects printing accuracy.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an axial fine-tuning device for a gravure printing press roller, comprising a roller assembly, an adjustment assembly, and a compensation assembly; the roller assembly includes a base, vertical plates disposed on both sides of the top of the base, a rotating shaft disposed between the vertical plates, and a roller body disposed on the surface of the rotating shaft; the adjustment assembly is disposed on one side of the vertical plates; the compensation assembly includes hydraulic cylinders disposed on both sides of the top of the base, a floating joint disposed at the top output end of the hydraulic cylinder, a thrust bearing disposed on the top of the floating joint and connected to the surface of the rotating shaft, an accumulator disposed on the top of the base and connected to the hydraulic cylinder, a pressure-compensating pump disposed on the top of the base and connected to the accumulator, and a pressure sensor disposed on one side of the hydraulic cylinder with its probe extending into the interior of the hydraulic cylinder; When wear at the connection between the rotating shaft and the vertical plate causes the gap to increase, the pressure in the rodless chamber of the hydraulic cylinder changes. The pressure sensor triggers a signal, and the pressure replenishment pump replenishes pressure to the accumulator until the pressure in the rodless chamber of the hydraulic cylinder returns to the set value. Then, the thrust bearing tightens the rotating shaft again, completing the gap compensation.

[0006] Preferably, the adjustment assembly includes a frame disposed on one side of the vertical plate, a fixed sleeve disposed on one side of the frame, a threaded sleeve disposed in the middle inside the fixed sleeve, a lead screw disposed inside the threaded sleeve, an adjustment handwheel disposed at one end of the lead screw, and a rotating connecting sleeve disposed at the other end of the lead screw and connected to the rotating shaft.

[0007] Preferably, a return spring is provided on the inner sidewall of the fixed sleeve near the adjusting handwheel, and a return plate is provided at one end of the return spring. The return plate is curved, and the curvature of the return plate is the same as the curvature of the outer wall of the lead screw.

[0008] Preferably, the inner sidewall of the fixed sleeve near the rotating connecting sleeve is provided with an annular elastic ring, the inner sidewall of the fixed sleeve is provided with a limiting groove, and the outer wall of the annular elastic ring is provided with a matching limiting block.

[0009] Preferably, the surface of the adjusting handwheel is provided with a rotating handle, and the surface of the player's handle is provided with a rubber anti-slip sleeve. The rotating connecting sleeve is coaxially arranged with the rotating shaft, and the surface of the lead screw is provided with scale lines.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the design of a compensation component, addresses the issue that when wear at the connection between the rotating shaft and the vertical plate leads to an increased gap, a change in the pressure in the rodless chamber of the hydraulic cylinder triggers a signal. The pressure sensor then activates a pressure replenishment pump to supply pressure to the accumulator until the pressure in the rodless chamber of the hydraulic cylinder returns to the set value. The thrust bearing then tightens the rotating shaft again, completing the gap compensation. This effectively avoids pattern misalignment and color overlap caused by wear gaps, further ensuring the consistency of printing registration accuracy. Simultaneously, the damping effect of the hydraulic oil inside the hydraulic cylinder reduces vibration of the rotating shaft, further improving printing accuracy.

[0011] 2. This utility model also incorporates an adjustment component. A return spring is provided on one side inside the fixed sleeve, and a return plate is provided at one end of the spring. The return spring pushes the return plate to fit against the surface of the lead screw, which can eliminate the return gap between the lead screw and the threaded sleeve. The annular elastic ring further restricts the radial movement of the lead screw, thereby further improving the axial adjustment accuracy of the printing roller and meeting the high-precision requirements of multi-color overprinting, film printing, and other high-precision scenarios. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the printing roller assembly structure of this utility model; Figure 3 This is a schematic diagram of the adjustment component structure of this utility model; Figure 4 This is a schematic diagram of the reset tray structure of this utility model; Figure 5 This is a schematic diagram of the annular elastic ring structure of this utility model; Figure 6 This is an exploded view of the adjustment component of this utility model; Figure 7 This is a schematic diagram of the compensation component structure of this utility model.

[0013] The following are the labels in the diagram: 1. Printing roller assembly; 101. Base; 102. Vertical plate; 103. Rotating shaft; 104. Printing roller body; 2. Adjustment assembly; 201. Frame; 202. Fixed sleeve; 203. Threaded sleeve; 204. Lead screw; 205. Adjusting handwheel; 206. Rotary connecting sleeve; 207. Return spring; 208. Return support plate; 209. Annular elastic ring; 3. Compensation assembly; 301. Hydraulic cylinder; 302. Floating joint; 303. Thrust bearing; 304. Accumulator; 305. Pressure compensation pump; 306. Pressure sensor. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: This utility model relates to an axial fine-adjustment device for a gravure printing press roller, comprising a roller assembly 1, an adjustment assembly 2, and a compensation assembly 3. The roller assembly 1 includes a base 101, vertical plates 102 fixedly connected to both sides of the top of the base 101, a rotating shaft 103 rotatably connected between the vertical plates 102, and a roller body 104 fixedly connected to the surface of the rotating shaft 103. The base 101 serves as the supporting foundation for the entire device, the vertical plates 102 provide positioning support for the rotating shaft 103, and the rotating shaft 103 acts as a "transmission bridge" for the roller body 104. By connecting and fixing the roller body 104 with a key, external power can be transmitted to the roller body 104, driving it to rotate and achieve printing. At the same time, the rotating shaft 103 can move axially under the drive of the adjusting component 2 to achieve fine adjustment of the position of the printing roller. The printing roller body 104 is used to absorb ink and transfer it to the surface of the printing material to complete the printing operation. The adjusting component 2 is installed on one side of the vertical plate 102. The compensation component 3 includes hydraulic cylinders 301 fixedly connected to both sides of the top of the base 101, a floating joint 302 fixedly connected to the top output end of the hydraulic cylinder 301, a thrust bearing 303 fixedly connected to the top of the floating joint 302 and connected to the surface of the rotating shaft 103, an accumulator 304 fixedly connected to the top of the base 101 and connected to the hydraulic cylinder 301, and a accumulator 304 fixedly connected to the top of the base 101 and connected to the accumulator 304. The hydraulic cylinder 301 is connected to a pressure pump 305 and a pressure sensor 306, which is fixedly connected to one side of the hydraulic cylinder 301 and whose probe extends into the hydraulic cylinder 301. The hydraulic cylinder 301 is used to apply axial clamping force to the rotating shaft 103. When the bearing has a gap due to wear, the piston rod of the hydraulic cylinder 301 extends to push the rotating shaft 103 to move and fill the gap. The floating joint 302 is used to connect the piston rod of the hydraulic cylinder 301 to the thrust bearing 303. The thrust bearing 303 is a double-direction thrust ball bearing. The inner ring is fitted on the end of the rotating shaft 103, and the outer ring is connected to the floating joint 302 to transmit the axial clamping force of the hydraulic cylinder 301 to the rotating shaft 103, while allowing the rotating shaft 103 to rotate freely. To prevent the clamping force from affecting the printing roller's rotation, the accumulator 304 is a bladder-type accumulator 304, connected to the rodless chamber of the hydraulic cylinder 301 and pre-filled with nitrogen. On one hand, it stores hydraulic oil, quickly releasing it when the hydraulic cylinder 301 needs additional pressure, avoiding frequent starts of the pressure replenishment pump 305; on the other hand, it buffers pressure fluctuations in the hydraulic system, maintaining stable pressure in the rodless chamber of the cylinder, ensuring continuous and uniform clamping force, and preventing repeated gaps. The pressure replenishment pump 305 injects high-pressure hydraulic oil into the accumulator 304 when the pressure drops due to gap compensation, restoring the system pressure to the set value. The pressure sensor 306 is used to detect the hydraulic oil pressure inside the chamber in real time.This invention, through the design of the compensation component 3, addresses the issue of increased clearance due to wear at the connection between the rotating shaft 103 and the vertical plate 102. This causes a change in the pressure in the rodless chamber of the hydraulic cylinder 301, triggering a signal from the pressure sensor 306. The pressure pump 305 then replenishes pressure to the accumulator 304 until the pressure in the rodless chamber of the hydraulic cylinder 301 returns to the set value. The thrust bearing 303 then tightens the rotating shaft 103 again, completing the clearance compensation. This effectively prevents pattern misalignment and color overlap caused by wear clearance, further ensuring the consistency of printing registration accuracy. Simultaneously, the damping effect of the hydraulic oil inside the hydraulic cylinder 301 reduces vibration of the rotating shaft 103, further improving printing accuracy.

[0015] Specifically, the adjusting assembly 2 includes a frame 201 fixedly connected to one side of the vertical plate 102, a fixed sleeve 202 fixedly connected to one side of the frame 201, a threaded sleeve 203 fixedly connected to the middle of the fixed sleeve 202, a lead screw 204 threadedly connected to the inside of the threaded sleeve 203, an adjusting handwheel 205 fixedly connected to one end of the lead screw 204, and a rotating connecting sleeve 206 rotatably connected to the other end of the lead screw 204 and connected to the rotating shaft 103. The frame 201 is used to install the fixed sleeve 202 and also provides protection for the adjusting components, reducing the contamination of the transmission structure by dust and ink. The fixed sleeve 202 is cylindrical and is used to support the threaded sleeve 203, the return spring 207, and the annular elastic ring. Components such as 209 include a threaded sleeve 203 for connecting the lead screw 204, converting the rotational motion into the axial linear motion of the lead screw 204. The lead screw 204 drives the rotating connecting sleeve 206, which in turn drives the rotating shaft 103 and the printing roller body 104 to move. The adjusting handwheel 205 is used to improve the ease of operation, and the movement of the lead screw 204 can be precisely controlled by controlling the rotation angle of the handwheel. The rotating connecting sleeve 206 connects the rotating shaft 103 and the lead screw 204, separating the rotational motion from the axial motion. This ensures that the axial movement of the lead screw 204 can be synchronously transmitted to the rotating shaft 103, while allowing the rotating shaft 103 to rotate freely, thus avoiding interference with the printing roller operation caused by the rotation of the lead screw 204.

[0016] More specifically, a return spring 207 is fixedly connected to the inner side wall of the fixed sleeve 202 near the adjusting handwheel 205. A return plate 208 is fixedly connected to one end of the return spring 207. The return plate 208 is curved, and the curvature of the return plate 208 is the same as the curvature of the outer wall of the lead screw 204. The return spring 207 is always in a pre-tight state and can apply a pushing force toward the lead screw 204 to the return plate 208 to ensure that the return plate 208 fits tightly against the surface of the lead screw 204. When the lead screw 204 rotates in the opposite direction, the return spring 207 can eliminate the "backlash" between the lead screw 204 and the threaded sleeve 203, thereby improving the adjustment accuracy.

[0017] It is worth noting that an annular elastic ring 209 is snapped into the inner sidewall of the fixed sleeve 202 near the rotating connecting sleeve 206. A limit groove is provided on the inner sidewall of the fixed sleeve 202, and a matching limit block is fixedly connected to the outer wall of the annular elastic ring 209. The annular elastic ring 209 is made of oil-resistant nitrile rubber and is fixed to the limit groove of the fixed sleeve 202 by the limit block. The inner wall is tightly attached to the surface of the lead screw 204. On the one hand, it can prevent ink and dust from entering the interior of the fixed sleeve 202, avoiding contamination of the threaded transmission pair and causing accelerated wear. On the other hand, it can limit the radial movement of the lead screw 204, ensuring that the lead screw 204 moves smoothly only along the axial direction, reducing vibration during the adjustment process and further improving the adjustment accuracy.

[0018] It is worth mentioning that the surface of the adjusting handwheel 205 is equipped with a rotating handle, and the surface of the handle is fitted with a rubber anti-slip sleeve for easy operation by staff. The rotating connecting sleeve 206 is coaxially set with the rotating shaft 103, and the surface of the lead screw 204 is sprayed with scale lines for easy reading of accurate adjustment data by staff.

[0019] Working Principle: This embodiment provides an axial fine-tuning device for the printing roller of a gravure printing machine. In use, when the axial position of the printing roller body 104 needs adjustment, the operator rotates the adjusting handwheel 205, causing the lead screw 204 to rotate inside the threaded sleeve 203. Since the threaded sleeve 203 is fixed to the fixed sleeve 202, the lead screw 204 moves axially while rotating. The lead screw 204 drives the rotating shaft 103 to move axially synchronously through the rotating connecting sleeve 206, thereby adjusting the axial position of the printing roller body 104. During adjustment, the reset plate 208 remains in contact with the surface of the lead screw 204 under the action of the reset spring 207, eliminating the return gap between the lead screw 204 and the threaded sleeve 203. The annular elastic ring 209 ensures smooth movement of the lead screw 204, improving the adjustment... To improve accuracy, after long-term operation, the bearing between the rotating shaft 103 and the vertical plate 102 will develop axial clearance due to wear, which may cause axial movement of the roller body 104. At this time, the pressure in the rodless chamber of the hydraulic cylinder 301 will decrease due to the increased clearance, and the pressure sensor 306 will detect the pressure change. The pressure replenishment pump 305 will be controlled to replenish hydraulic oil into the accumulator 304. The accumulator 304 will transmit the pressure to the rodless chamber of the hydraulic cylinder 301, pushing the piston rod to move upward. The piston rod will apply an axial clamping force to the rotating shaft 103 through the floating joint 302 and the thrust bearing 303, pushing the rotating shaft 103 to move in the direction of eliminating the clearance until the bearing clearance is completely eliminated. The pressure in the rodless chamber of the hydraulic cylinder 301 will then return to the set value, completing the automatic clearance compensation.

[0020] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. An axial fine adjustment device for a gravure printing cylinder, characterized in that The system includes a printing roller assembly (1), an adjusting assembly (2), and a compensating assembly (3). The printing roller assembly (1) includes a base (101), vertical plates (102) disposed on both sides of the top of the base (101), a rotating shaft (103) disposed between the vertical plates (102), and a printing roller body (104) disposed on the surface of the rotating shaft (103). The adjusting assembly (2) is disposed on one side of the vertical plate (102). The compensating assembly (3) includes hydraulic cylinders (301) disposed on both sides of the top of the base (101), and a printing roller body (104) disposed on the surface of the rotating shaft (103). A floating joint (302) at the top output end of the hydraulic cylinder (301), a thrust bearing (303) located on the top of the floating joint (302) and connected to the surface of the rotating shaft (103), an accumulator (304) located on the top of the base (101) and connected to the hydraulic cylinder (301), a pressure boosting pump (305) located on the top of the base (101) and connected to the accumulator (304), and a pressure sensor (306) located on one side of the hydraulic cylinder (301) with its probe extending into the interior of the hydraulic cylinder (301); When wear at the connection between the rotating shaft (103) and the vertical plate (102) causes the gap to increase, the pressure in the rodless chamber of the hydraulic cylinder (301) changes. The pressure sensor (306) triggers a signal, and the pressure replenishing pump (305) replenishes the pressure to the accumulator (304) until the pressure in the rodless chamber of the hydraulic cylinder (301) returns to the set value. Then, the thrust bearing (303) presses against the rotating shaft (103) again, completing the gap compensation.

2. The axial fine-tuning device for a gravure printing press roller according to claim 1, characterized in that, The adjustment assembly (2) includes a frame (201) disposed on one side of the vertical plate (102), a fixed sleeve (202) disposed on one side of the frame (201), a threaded sleeve (203) disposed in the middle inside the fixed sleeve (202), a lead screw (204) disposed inside the threaded sleeve (203), an adjustment handwheel (205) disposed at one end of the lead screw (204), and a rotating connecting sleeve (206) disposed at the other end of the lead screw (204) and connected to the rotating shaft (103).

3. The axial fine-tuning device for a gravure printing press roller according to claim 2, characterized in that, A reset spring (207) is provided on the inner side wall of the fixed sleeve (202) near the adjusting handwheel (205). A reset plate (208) is provided at one end of the reset spring (207). The reset plate (208) is bent, and the curvature of the reset plate (208) is the same as the curvature of the outer wall of the lead screw (204).

4. The axial fine-tuning device for a gravure printing press roller according to claim 3, characterized in that, The inner sidewall of the fixed sleeve (202) near the rotating connecting sleeve (206) is provided with an annular elastic ring (209), the inner sidewall of the fixed sleeve (202) is provided with a limiting groove, and the outer wall of the annular elastic ring (209) is provided with a matching limiting block.

5. The axial fine-tuning device for a gravure printing press roller according to claim 4, characterized in that, The surface of the adjustment handwheel (205) is provided with a rotating handle, and the surface of the contestant's handle is provided with a rubber anti-slip sleeve. The rotating connecting sleeve (206) is coaxially arranged with the rotating shaft (103), and the surface of the lead screw (204) is provided with scale lines.

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