Polishing device for sheet-fed printing machine

Abstract

The invention relates to the technical field of printing press glazing, and discloses a glazing device for a sheet-fed printing press, which comprises a rack and a coating roller rotatably mounted on the inner wall of the rack, and a metering roller is rotatably mounted on the inner wall of the rack and located on the side edge of the coating roller. And a lining roller is rotationally installed at the position, under the coating roller, of the inner wall of the rack, an oiling structure corresponding to the coating roller and the metering roller is arranged on the rack, and a fixing plate corresponding to the coating roller is fixedly installed on the inner wall of the rack. According to the glazing device for the sheet-fed printing machine, when paper is wound around a coating roller, the end of the paper makes contact with a paper-proof plate and covers a photosensitive probe, an electric push rod is triggered to extend, a guide sleeve is driven to rotate through a connecting plate, the paper-proof plate stirs the paper to be stripped and reset, and after resetting, the electric push rod is shortened to drive the paper-proof plate to be attached to the coating roller, and manual shutdown cleaning is not needed; roll paper faults are quickly eliminated, production interruption is avoided, glazing efficiency is remarkably improved, and manual intervention cost and operation risks are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing machine glazing, in particular to a glazing device for sheet-fed printing press. BACKGROUND

[0002] The glazing device of the printing machine is a special mechanism equipped in the printing related equipment, and its core function is to uniformly coat a layer of colorless transparent paint on the surface of the printed matter through a specific coating method, and then to make the paint solidify into a film with the help of the matching drying mechanism, so as to finally realize the improvement of the glossiness of the printed matter, the enhancement of the wear resistance and water resistance, and the protection of the printed graphics.

[0003] According to the search, a glazing device for sheet-fed printing press is disclosed in Chinese patent CN118003765A, which comprises a workbench and a drying device; wherein the surface of the workbench is fixedly installed with a motor, the output end of the motor is fixedly installed with a transmission shaft, the surface of the workbench is fixedly installed with a printing mechanism, the printing mechanism is drivingly connected with the transmission shaft through a transmission belt, and the surface of the workbench is fixedly installed with a glazing roller, which is drivingly connected with the printing mechanism through a transmission belt; wherein the drying device comprises a drying machine, an exhaust pipe, a baffle, a rotating shaft, a sleeve and an L-shaped rod. The glazing device can effectively avoid the influence of the uncured printing matter on the surface of the printed matter on the glazing operation, and can dry the surface of the printed matter that has been subjected to the glazing operation, so as to make the glazing agent solidify and improve the glazing efficiency; however, the following problems still exist in actual use of the scheme: In the glazing processing link on the surface of the printed matter, when processing paper with small grammage, such paper has loose fiber structure and low basis weight, resulting in weak overall physical strength and extremely high flexibility. After entering the coating system of the glazing device, the paper is affected by multiple factors such as friction force generated by high-speed operation of the coating roller, adsorption force between the roller surface and the paper, and difficulty in controlling the tension of the paper, and cannot stably maintain a flat transmission posture, but will be irregularly and tightly wound along the outer wall of the coating roller. Such winding not only causes the paper to deviate from the normal glazing process and fail to complete the coating operation, but also causes the transmission path of the subsequent paper to be blocked, forcing the glazing equipment to stop running, resulting in a significant reduction in the glazing processing amount per unit time and a serious reduction in the overall glazing production efficiency. SUMMARY

[0004] The technical problem to be solved by the present application is that in the prior art, when glazing low-grammage paper, the paper is easily wound around the coating roller due to its high flexibility and uncontrollable tension, manual cleaning is required, the production is interrupted, and the efficiency is reduced. Therefore, we propose a glazing device for sheet-fed printing press.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a glazing device for a single sheet printing machine, comprising a rack and a coating roller rotatably installed on the inner wall of the rack, a metering roller is rotatably installed on the inner wall of the rack at the side edge position of the coating roller, a backing roller is rotatably installed on the inner wall of the rack at the position directly below the coating roller, an oiling structure corresponding to the coating roller and the metering roller is arranged on the rack, a fixed plate corresponding to the coating roller is fixedly installed on the inner wall of the rack, an adjusting structure is arranged on the side surface of the fixed plate, two support rods are arranged at the two ends of the adjusting structure, a rotating rod is rotatably installed at the end of the support rod away from the adjusting structure, a limiting structure is arranged between the support rod and the rotating rod, a paperboard preventing plate corresponding to the coating roller is fixedly installed at the end of the rotating rod, a photosensitive probe is arranged on the side surface of the paperboard preventing plate, an electric push rod is hingedly connected to the side surface of the fixed plate, two guide grooves are symmetrically formed in the side surface of the fixed plate, and a cleaning assembly corresponding to the paperboard preventing plate is arranged on the inner wall of the guide groove.

[0006] Preferably, the oiling structure comprises an upper liquid pump fixedly installed on the side surface of the rack, and a filling pipe corresponding to the coating roller and the metering roller is fixedly installed at the liquid outlet end of the upper liquid pump.

[0007] Preferably, the adjusting structure comprises a guide sleeve rotatably installed on the side surface of the fixed plate through a mounting frame, adjusting screws are slidably installed on the inner walls at the two ends of the guide sleeve through sliding grooves and sliding blocks, threaded sleeves are rotatably installed at the two ends of the guide sleeve, the threaded sleeves are screwed with the adjusting screws, and a connecting plate is fixedly installed on the outer wall of the guide sleeve.

[0008] Preferably, the telescopic end of the electric push rod is hingedly connected to the side surface of the connecting plate, and the end of the support rod is fixedly connected with the end of the adjusting screw.

[0009] Preferably, the limiting structure comprises a slot formed in the end of the support rod, a guide rod is slidably connected with the slot and fixedly installed at the end of the rotating rod, a torsion spring is sleeved on the outer wall of the connecting end of the support rod and the rotating rod, the two ends of the torsion spring are respectively fixedly connected with the support rod and the rotating rod, and a sleeving gear ring is fixedly sleeved on the rotating rod.

[0010] Preferably, the slot is a quarter annular slot.

[0011] Preferably, the cleaning assembly comprises a bracket slidably installed on the inner wall of the guide groove, a fixed sleeve is fixedly installed at the bottom end of the bracket, mounting plates are arranged at the two ends of the fixed sleeve, a connecting structure is arranged between the mounting plates and the fixed sleeve, two vertical rods adapted to the bracket are fixedly installed at the end of the adjusting screw, magnetic sheets I are arranged on the two side surfaces of the paperboard preventing plate, magnetic sheets II corresponding to the magnetic sheets I are fixedly installed at the two ends of the mounting plates, and guide structures corresponding to the sleeving gear ring are arranged on the opposite side surfaces of the two mounting plates.

[0012] Preferably, the connecting structure comprises a sliding rod slidingly installed on the inner wall of the fixing sleeve, the end of the sliding rod is fixedly connected with the side of the mounting plate, the opening end of the fixing sleeve is fixedly installed with a positioning rubber ring on the inner wall, and the outer wall of the two ends of the sliding rod is provided with a positioning ring groove.

[0013] Preferably, the guiding structure comprises a cleaning scraper fixedly installed on the side of one mounting plate corresponding to the paperboard, the side of the other mounting plate is fixedly installed with a fixed tooth plate engaged with the sleeving gear ring, the end of the fixed tooth plate is provided with a mounting groove, the inner wall of the mounting groove is slidingly installed with a guide plate, a spring one is fixedly installed between the end of the guide plate and the inner wall of the mounting groove, one end of the guide plate located outside the mounting groove is fixedly installed with a fixed seat, the side of the fixed seat is slidingly installed with a limiting tooth frame corresponding to the fixed tooth plate, and the inner wall of the limiting tooth frame and the side of the fixed seat are fixedly installed with a spring two.

[0014] Preferably, the fixed tooth plate and the limiting tooth frame are both arranged in an arc shape matched with the moving path of the sleeving gear ring.

[0015] Technical effects and advantages of the present application: In the present application, by rotating and adjusting the threaded sleeve screwed with the adjusting screw rod, the adjusting screw rod is driven to slide along the inner wall of the guide sleeve, thereby changing the distance between the paperboard, so that it is accurately corresponding to the two ends of the paper, and at the same time, the vertical rod can clasp the bracket and always be located outside the bracket during adjustment, ensuring that the bracket slides along the guide groove, the mounting plate and the paperboard are continuously corresponding, avoiding the gloss deviation caused by the size difference of the paper, and having strong adaptability.

[0016] In the present application, when the paper is wound around the coating roller, the end of the paper will contact the paperboard and cover the photosensitive probe, triggering the extension of the electric push rod, driving the guide sleeve to rotate through the connecting plate, making the paperboard dislodge the paper to reset, and after resetting, the electric push rod is shortened to drive the paperboard to reattach the coating roller, without manual shutdown and cleaning, quickly resolving the paper winding failure, avoiding production interruption, significantly improving the gloss efficiency, and reducing the cost and operation risk of manual intervention.

[0017] In the present application, when the electric push rod is shortened and reset, the mounting plates are close to each other, the sleeving gear ring of the rotating rod first contacts the fixed tooth plate, drives the paperboard to rotate 90 degrees, and then moves with the guide plate to contact the cleaning scraper, the scraper removes the residual gloss oil on the side of the paperboard, and after cleaning, the components are reset under the action of the torsional spring and the spring, avoiding the pollution of the residual gloss oil to the subsequent paper, ensuring that the gloss effect of each paper is uniform, and reducing the product failure rate. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosed content of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference signs are used to refer to the same parts: Figure 1 Overall structure of the present application Figure 1 ; Figure 2 Overall structure of the present application Figure 2 ; Figure 3 Fixed plate structure of the present application Figure 4 Partial cutaway structure of the guide sleeve of the present application Figure 5 Exploded structure of the brace and the rotating rod of the present application Figure 6 Structure of the support and the mounting plate of the present application Figure 7 Structure of the support and the mounting plate of the present application Figure 6 Enlarged structure of position A in the above figure Figure 8 Enlarged structure of position B in the above figure Figure 5 Enlarged structure of position B in the above figure Figure 9 Exploded structure of the fixed tooth plate, the fixed seat and the limiting tooth frame of the present application

[0019] Legend: 11, frame; 12, coating roller; 13, metering roller; 14, backing roller; 21, liquid feeding pump; 22, filling pipe; 31, fixed plate; 32, guide sleeve; 33, adjusting screw; 34, threaded sleeve; 35, connecting plate; 41, brace; 42, rotating rod; 43, paper preventing plate; 44, light sensing probe; 45, electric push rod; 51, guide groove; 52, support; 53, fixed sleeve; 54, sliding rod; 55, mounting plate; 56, vertical rod; 57, magnetic sheet one; 58, magnetic sheet two; 59, positioning ring groove; 510, positioning rubber ring; 61, slotted hole; 62, guide rod; 63, torsional spring; 64, sleeved tooth ring; 71, cleaning scraper; 72, fixed tooth plate; 73, mounting groove; 74, guide plate; 75, spring one; 76, fixed seat; 77, limiting tooth frame; 78, spring two. DETAILED DESCRIPTION

[0020] It is easy to understand that, according to the technical solution of the present application, one of ordinary skill in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and the accompanying drawings are only exemplary description of the technical solution of the present application, and should not be regarded as the whole or as the limitation or restriction of the technical solution of the present application.

[0021] Reference Figures 1-9As shown, the present application provides a technical scheme: a glazing device for a single sheet printing machine, comprising a rack 11 and a coating roller 12 rotatably installed on the inner wall of the rack 11, a metering roller 13 rotatably installed on the inner wall of the rack 11 at the side of the coating roller 12, a backing roller 14 rotatably installed on the inner wall of the rack 11 directly below the coating roller 12, the rack 11 is provided with an oiling structure corresponding to the coating roller 12 and the metering roller 13, the inner wall of the rack 11 is fixedly installed with a fixed plate 31 corresponding to the coating roller 12, the side of the fixed plate 31 is provided with an adjusting structure, both ends of the adjusting structure are provided with a support rod 41, one end of the support rod 41 away from the adjusting structure is rotatably installed with a rotating rod 42, a limiting structure is arranged between the support rod 41 and the rotating rod 42, the end of the rotating rod 42 is fixedly installed with a paperboard 43 corresponding to the coating roller 12, the side of the paperboard 43 is provided with a light sensor 44, the side of the fixed plate 31 is hinged with an electric push rod 45, the side of the fixed plate 31 is symmetrically provided with two guide grooves 51, the inner wall of the guide groove 51 is provided with a cleaning assembly corresponding to the paperboard 43. The oiling structure comprises an upper liquid pump 21 fixedly installed on the side of the rack 11, and the outlet end of the upper liquid pump 21 is fixedly installed with a filling pipe 22 corresponding to the coating roller 12 and the metering roller 13.

[0022] The rack 11 is arranged on the body of the printing machine, the single sheet after printing can enter the rack 11 through the conveying device, and can pass between the backing roller 14 and the coating roller 12, when the paper passes between the coating roller 12 and the backing roller 14, the backing roller 14 rotates to convey the paper, the coating roller 12 and the metering roller 13 rotate in opposite directions to realize glazing of the paper, during the whole process, the upper liquid pump 21 is opened, the glazing oil is added to the coating roller 12 and the metering roller 13 through the filling pipe 22, so as to provide oil for the coating roller 12; if the paper is rolled, the paper adhered to the outer wall of the coating roller 12 rotates with the coating roller 12, the end of the paper can contact the paperboard 43 and move to the outside of the two paperboards 43 under the action of the sharp end of the paperboard 43, covering the light sensor 44 on the side of the paperboard 43, when the light sensor 44 is covered, the electric push rod 45 can be opened and elongated, then shortened and reset, the working principle and connection mode of the light sensor 44 and the electric push rod 45 are mature technologies, which will not be described in detail here, the electric push rod 45 can drive the two paperboards 43 to rotate through the adjusting structure when it is elongated, the paper can be poked, the paper can be peeled off and reset to a horizontal flat state when the paperboard 43 rotates, so as to realize normal glazing, after the paper is reset, the electric push rod 45 can drive the two paperboards 43 to reset and adhere to the outer wall of the coating roller 12, the subsequent paper unwinding function can continue to be realized normally.

[0023] Reference Figure 3 And Figure 4As shown, the adjusting structure comprises a guide sleeve 32 rotatably mounted on the side of the fixed plate 31 through the mounting bracket, the inner walls of both ends of the guide sleeve 32 are slidably mounted with adjusting screws 33 through the sliding groove and the sliding block, the end of the supporting rod 41 is fixedly connected with the end of the adjusting screw 33, both ends of the guide sleeve 32 are rotatably mounted with threaded sleeves 34, and the threaded sleeves 34 are screwed with the adjusting screws 33, the outer wall of the guide sleeve 32 is fixedly mounted with a connecting plate 35, and the telescopic end of the electric push rod 45 is hinged with the side surface of the connecting plate 35.

[0024] During the entire polishing process, the paperboard 43 is attached to the outer wall of the coating roller 12, and the staff needs to adjust the position of the two paperboards 43 according to the size of the paper to be polished. When adjusting, the threaded sleeve 34 can be rotated, the threaded sleeve 34 is screwed with the adjusting screw 33, the adjusting screw 33 is slidably connected with the inner wall of the guide sleeve 32 through the sliding groove and the sliding block, so that the threaded sleeve 34 can drive the adjusting screw 33 to slide along the inner wall of the guide sleeve 32 when rotating, thereby adjusting the position of the paperboard 43, so that the paperboard 43 can correspond to both ends of the paper.

[0025] Referring to Figures 4-7 As shown, the cleaning assembly comprises a bracket 52 slidably mounted on the inner wall of the guide groove 51, the bottom end of the bracket 52 is fixedly mounted with a fixed sleeve 53, both ends of the fixed sleeve 53 are provided with mounting plates 55, and a connecting structure is arranged between the mounting plates 55 and the fixed sleeve 53, the end of the adjusting screw 33 is fixedly mounted with two vertical rods 56 adapted to the bracket 52, both side surfaces of the paperboard 43 are provided with magnetic sheets one 57, both ends of the mounting plate 55 are fixedly mounted with magnetic sheets two 58 corresponding to the magnetic sheets one 57, and the opposite side surfaces of the two mounting plates 55 are provided with guide structures corresponding to the sleeved gear ring 64. The connecting structure comprises a sliding rod 54 slidably mounted on the inner wall of the fixed sleeve 53, the end of the sliding rod 54 is fixedly connected with the side surface of the mounting plate 55, the inner wall of the open end of the fixed sleeve 53 is fixedly mounted with a positioning rubber ring 510, and the outer walls of both ends of the sliding rod 54 are provided with positioning ring grooves 59.

[0026] When the threaded sleeve 34 rotates to adjust the adjusting screw 33, the two vertical rods 56 at the end of the adjusting screw 33 can clamp the bracket 52, and the length of the vertical rod 56 can also be located outside the bracket 52 when it rotates with the adjusting screw 33, ensuring that the bracket 52 can slide along the guide groove 51 when the adjusting screw 33 adjusts the position, and the mounting plate 55 can always correspond to the paperboard 43; in the initial state, the electric push rod 45 is not elongated as Figure 4As shown, the magnetic sheet one 57 on both sides of the paperboard 43 has the same magnetic pole as the magnetic sheet two 58 on the end of the mounting plate 55, and the slide rod 54 extends out of the fixed sleeve 53 under the action of repulsive magnetic force, the mounting plate 55 is away from the paperboard 43, and the electric push rod 45 is elongated, so that the paperboard 43 can normally drive the paper to reset, and when the electric push rod 45 is elongated to the end, the magnetic pole of the magnetic sheet one 57 on the paperboard 43 is opposite to that of the magnetic sheet two 58 on the other end of the mounting plate 55, and then the slide rod 54 can slide into the fixed sleeve 53 under the action of attractive magnetic force, and the two mounting plates 55 are close to each other, and the two positioning ring grooves 59 on the outer wall of the slide rod 54 can be clamped with the positioning rubber ring 510 in the fixed sleeve 53 when the mounting plate 55 is located at the two positions, so as to maintain the stability of the position of the mounting plate 55.

[0027] Referring to Figure 4 , Figure 5 and Figure 8 , the limiting structure includes a slot 61 opened at the end of the support rod 41, the slot 61 is provided as a quarter annular groove, the end of the rotating rod 42 is fixedly installed with a guide rod 62 in sliding connection with the slot 61, the outer wall of the connecting end of the support rod 41 and the rotating rod 42 is sleeved with a torsional spring 63, and the two ends of the torsional spring 63 are fixedly connected with the support rod 41 and the rotating rod 42 respectively, and the rotating rod 42 is fixedly sleeved with a sleeving gear ring 64.

[0028] Referring to Figure 6 and Figure 9 , the guide structure includes a cleaning scraper 71 fixedly installed on the side of one of the mounting plates 55 corresponding to the paperboard 43, and the side of the other mounting plate 55 is fixedly installed with a fixed tooth plate 72 engaged with the sleeving gear ring 64, the end of the fixed tooth plate 72 is provided with a mounting groove 73, the inner wall of the mounting groove 73 is slidably installed with a guide plate 74, and the end of the guide plate 74 and the inner wall of the mounting groove 73 are fixedly installed with a spring one 75, one end of the guide plate 74 located outside the mounting groove 73 is fixedly installed with a fixed seat 76, the side of the fixed seat 76 is slidably installed with a limiting tooth frame 77 corresponding to the fixed tooth plate 72, the inner wall of the limiting tooth frame 77 and the side of the fixed seat 76 are fixedly installed with a spring two 78, and the fixed tooth plate 72 and the limiting tooth frame 77 are both provided as an arc shape adapted to the movement path of the sleeving gear ring 64.

[0029] When the electric push rod 45 is extended, the two mounting plates 55 are away from each other, the sleeving gear ring 64 and the paperboard 43 cannot contact the fixed gear plate 72 and the cleaning scraper 71, and as the electric push rod 45 is shortened, the two mounting plates 55 are close to each other, the sleeving gear ring 64 on the outer wall of the rotating rod 42 can contact the fixed gear plate 72 in the process of reverse rotation and reset of the supporting rod 41 and the rotating rod 42, and in the process of rotation, the rotating rod 42 and the paperboard 43 can drive the rotating rod 42 to rotate 90 degrees through the slot 61 and the guide rod 62, and the torsional spring 63 is compressed, and when the sleeving gear ring 64 moves to the end of the fixed gear plate 72, it can contact the limiting gear frame 77, and under the limiting action of the slot 61 and the guide rod 62, the rotating rod 42 cannot continue to rotate, thereby driving the limiting gear frame 77, the fixed seat 76 and the guide plate 74 to slide along the mounting groove 73, in this process, the side of the paperboard 43 can contact the cleaning scraper 71 when the paperboard 43 moves, thereby the cleaning scraper 71 can scrape off the side of the paperboard 43, avoiding affecting the glazing of the next adhered paper, and when the paperboard 43 passes through the cleaning scraper 71, the guide plate 74 moves to the end of the mounting groove 73 and is fixed, and as the electric push rod 45 continues to shorten, the paperboard 43 continues to move, and the sleeving gear ring 64 can push the limiting gear frame 77, so that the sleeving gear ring 64 passes through the limiting gear frame 77 and resets under the action of the torsional spring 63, and when the electric push rod 45 is shortened and positioned, the paperboard 43 can be attached to the outer wall of the coating roller 12, so as to continue to be used, and under the action of the spring one 75 and the spring two 78, the guide plate 74, the fixed seat 76 and the limiting gear frame 77 can also reset.

[0030] Working principle: when in use, the rack 11 is arranged on the body of the printing machine, the single printed paper can enter the rack 11 through the conveying device, and can pass between the coating roller 12 and the backing roller 14, when the paper passes between the coating roller 12 and the backing roller 14, the backing roller 14 rotates to convey the paper, and the coating roller 12 and the metering roller 13 rotate in opposite directions to glaze the paper, and in the whole process, the liquid pump 21 is opened to add the glazing oil to the coating roller 12 and the metering roller 13 through the filling pipe 22, so as to provide oil for the coating roller 12; in the whole glazing process, the paperboard 43 is attached to the outer wall of the coating roller 12, and the workers need to adjust the position of the two paperboards 43 according to the size of the paper to be glazed, and when adjusting, the threaded sleeve 34 can be rotated, the threaded sleeve 34 is screwed with the adjusting screw 33, the adjusting screw 33 is slidably connected with the inner wall of the guide sleeve 32 through the sliding groove and the sliding block, so that the threaded sleeve 34 can drive the adjusting screw 33 to slide along the inner wall of the guide sleeve 32 when rotating, thereby adjusting the position of the paperboard 43, so that the paperboard 43 can correspond to the two ends of the paper; Subsequently, the coating roller 12 can be normal glazing work, and if the paper roll occurs, the paper adheres to the outer wall of the coating roller 12 when the coating roller 12 rotates, the end of the paper can be in contact with the paper board 43 and under the action of the paper board 43 tip paper can be moved to the outside of the two paper board 43, covering the side of the paper board 43 photosensitive probe 44, and when the photosensitive probe 44 is covered, the electric push rod 45 can be opened and extended and then shortened, the working principle and connection mode of the photosensitive probe 44 and the electric push rod 45 are mature technology, and will not be described here. When the electric push rod 45 is extended, it can drive the guide sleeve 32 to rotate through the connecting plate 35, so that the two paper board 43 rotates and the paper is pushed, the paper board 43 rotates and the paper is peeled off and reset to a horizontal flat state, so as to carry out normal glazing. After resetting the paper, the electric push rod 45 is shortened to drive the guide sleeve 32 to rotate in the opposite direction, so that the two paper board 43 is reset to the outer wall of the coating roller 12, and the subsequent paper unwinding function can continue normally. When the threaded sleeve 34 rotates to adjust the adjusting screw 33, the two vertical rods 56 at the end of the adjusting screw 33 can clamp the bracket 52, and the length of the vertical rod 56 can be outside the bracket 52 when it rotates with the adjusting screw 33, ensuring that the bracket 52 can slide along the guide groove 51 when the adjusting screw 33 adjusts the position, and the mounting plate 55 can always correspond to the paper board 43; In the initial state, the electric push rod 45 is not extended as shown in Figure 4 The magnetic sheet one 57 on both sides of the paper board 43 has the same magnetic pole as the magnetic sheet two 58 at the end of the mounting plate 55, and the slide rod 54 extends out of the fixed sleeve 53 under the action of the repulsive magnetic force, and the mounting plate 55 is away from the paper board 43. When the electric push rod 45 is extended, the paper board 43 can normally reset the paper, and when the electric push rod 45 is extended to the end, the magnetic sheet one 57 on the paper board 43 has opposite magnetic poles to the magnetic sheet two 58 at the other end of the mounting plate 55, and the slide rod 54 can slide into the fixed sleeve 53 under the action of the attractive magnetic force, and the two mounting plates 55 are close to each other. When the mounting plate 55 is in two positions, the two positioning ring grooves 59 on the outer wall of the slide rod 54 can be clamped with the positioning rubber ring 510 in the fixed sleeve 53, so as to maintain the stability of the position of the mounting plate 55; When the electric push rod 45 is extended, the two mounting plates 55 are in a state of moving away from each other, the sleeving gear ring 64 and the paperboard 43 cannot contact the fixed tooth plate 72 and the cleaning scraper 71, and with the shortening of the electric push rod 45, the two mounting plates 55 move close to each other, the sleeving gear ring 64 on the outer wall of the rotating rod 42 can contact the fixed tooth plate 72 in the process of reverse rotation and reset of the supporting rod 41 and the rotating rod 42, and in the process of rotation, the rotating rod 42 and the paperboard 43 can drive the rotating rod 42 to rotate 90 degrees through the slot 61 and the guide rod 62, and the torsional spring 63 is compressed, and when the sleeving gear ring 64 moves to the end of the fixed tooth plate 72, the sleeving gear ring 64 can contact the limiting tooth frame 77, and under the limiting action of the slot 61 and the guide rod 62, the rotating rod 42 cannot continue to rotate, thereby driving the limiting tooth frame 77, the fixed seat 76 and the guide plate 74 to slide along the mounting groove 73, in the process, the side surface of the paperboard 43 can contact the cleaning scraper 71 when the paperboard 43 moves, thereby the cleaning scraper 71 can scrape off the side surface of the paperboard 43, avoiding affecting the glazing of the next adhered paper, and when the paperboard 43 passes through the cleaning scraper 71, the guide plate 74 moves to the end position of the mounting groove 73 and is fixed, with the continuous shortening of the electric push rod 45, the paperboard 43 continues to move, and the sleeving gear ring 64 can push the limiting tooth frame 77, so that the sleeving gear ring 64 passes through the limiting tooth frame 77 and is reset under the action of the torsional spring 63, when the electric push rod 45 is shortened and positioned, the paperboard 43 can be attached to the outer wall of the coating roller 12, so as to continue to be used, and under the action of the spring one 75 and the spring two 78, the guide plate 74, the fixed seat 76 and the limiting tooth frame 77 can also be reset.

[0031] The technical scope of the present application is not limited to the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should be within the protection scope of the present application.

Claims

1. A glazing device for a sheet-fed printing press, comprising a frame (11) and a coating roller (12) rotatably mounted on the inner wall of the frame (11), a metering roller (13) being rotatably mounted on the inner wall of the frame (11) at a position on the side of the coating roller (12), and a backing roller (14) being rotatably mounted on the inner wall of the frame (11) at a position directly below the coating roller (12), the frame (11) being provided with an oiling structure corresponding to the coating roller (12) and the metering roller (13), characterized in that: The inner wall of the rack (11) is fixedly provided with a fixed plate (31) corresponding to the coating roller (12), the side of the fixed plate (31) is provided with an adjusting structure, both ends of the adjusting structure are provided with a supporting rod (41), the end of the supporting rod (41) away from the adjusting structure is rotatably provided with a rotating rod (42), a limiting structure is arranged between the supporting rod (41) and the rotating rod (42), the end of the rotating rod (42) is fixedly provided with a paperboard preventing plate (43) corresponding to the coating roller (12), the side of the paperboard preventing plate (43) is provided with a light sensing probe (44), the side of the fixed plate (31) is hingedly provided with an electric push rod (45), the side of the fixed plate (31) is symmetrically provided with two guide grooves (51), and the inner wall of the guide groove (51) is provided with a cleaning assembly corresponding to the paperboard preventing plate (43).

2. The glazing device for a sheet-fed printing press according to claim 1, characterized in that: The oiling structure comprises an upper liquid pump (21) fixedly installed on the side of the rack (11), and the liquid outlet end of the upper liquid pump (21) is fixedly provided with an oil filling pipe (22) corresponding to the coating roller (12) and the metering roller (13).

3. The glazing device for sheet-fed printing presses according to claim 1, characterized in that: The adjusting structure comprises a guide sleeve (32) rotatably installed on the side of the fixed plate (31) through a mounting bracket, adjusting screw rods (33) are slidably installed on the inner walls of both ends of the guide sleeve (32) through sliding grooves and sliding blocks, threaded sleeves (34) are rotatably installed at both ends of the guide sleeve (32), the threaded sleeves (34) are screwed with the adjusting screw rods (33), and the outer wall of the guide sleeve (32) is fixedly provided with a connecting plate (35).

4. The glazing device for a sheet-fed printing press according to claim 3, characterized in that: The telescopic end of the electric push rod (45) is hingedly connected to the side of the connecting plate (35), and the end of the supporting rod (41) is fixedly connected to the end of the adjusting screw rod (33).

5. The glazing device for sheet-fed printing presses according to claim 3, characterized in that: The limiting structure comprises a slot (61) formed in the end of the supporting rod (41), the end of the rotating rod (42) is fixedly provided with a guide rod (62) slidably connected with the slot (61), the outer wall of the connecting end of the supporting rod (41) and the rotating rod (42) is sleeved with a torsion spring (63), both ends of the torsion spring (63) are fixedly connected with the supporting rod (41) and the rotating rod (42), and a sleeving gear ring (64) is fixedly sleeved on the rotating rod (42).

6. The glazing device for sheet-fed printing presses according to claim 5, characterized in that: The slot (61) is a quarter annular groove.

7. The glazing device for sheet-fed printing presses according to claim 5, characterized in that: The cleaning assembly comprises a support (52) slidably installed on the inner wall of the guide groove (51), the bottom end of the support (52) is fixedly provided with a fixed sleeve (53), both ends of the fixed sleeve (53) are provided with mounting plates (55), a connecting structure is arranged between the mounting plate (55) and the fixed sleeve (53), the end of the adjusting screw rod (33) is fixedly provided with two vertical rods (56) matched with the support (52), both sides of the paperboard preventing plate (43) are provided with magnetic sheets I (57), both ends of the mounting plate (55) are fixedly provided with magnetic sheets II (58) corresponding to the magnetic sheets I (57), and opposite sides of the two mounting plates (55) are provided with a guide structure corresponding to the sleeving gear ring (64).

8. The glazing device for a sheet-fed printing press according to claim 7, characterized in that: The connecting structure comprises a sliding rod (54) slidingly installed on the inner wall of a fixing sleeve (53), the end of the sliding rod (54) is fixedly connected with the side of a mounting plate (55), the opening end of the fixing sleeve (53) is fixedly installed with a positioning rubber ring (510), and the outer wall of the two ends of the sliding rod (54) is provided with a positioning ring groove (59).

9. The glazing device for sheet-fed printing presses according to claim 7, characterized in that: The guiding structure comprises a cleaning scraper (71) fixedly installed on the side of one mounting plate (55) and corresponding to the paperboard (43), the side of the other mounting plate (55) is fixedly installed with a fixed tooth plate (72) engaged with the sleeving gear ring (64), the end of the fixed tooth plate (72) is provided with a mounting groove (73), the inner wall of the mounting groove (73) is slidingly installed with a guide plate (74), the end of the guide plate (74) and the inner wall of the mounting groove (73) are fixedly installed with a spring (75), one end of the guide plate (74) located outside the mounting groove (73) is fixedly installed with a fixing seat (76), the side of the fixing seat (76) is slidingly installed with a limiting tooth frame (77) corresponding to the fixed tooth plate (72), and the inner wall of the limiting tooth frame (77) and the side of the fixing seat (76) are fixedly installed with a spring (78).

10. The glazing device for a sheet-fed printing press according to claim 9, characterized in that: The fixed tooth plate (72) and the limiting tooth frame (77) are both arranged in an arc shape matched with the moving path of the sleeving gear ring (64).

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