Inflatable cylinder of rotary offset printing plate

Abstract

A rotary offset printing plate air expansion cylinder comprises a wall plate, a mandrel and a plate cylinder, the mandrel comprises an air expansion main shaft, an air inflation fulcrum shaft and an installation fulcrum shaft, the air inflation fulcrum shaft and the installation fulcrum shaft are fixedly connected to the two ends of the air expansion main shaft respectively, and the air expansion main shaft is sleeved with the plate cylinder. The inflation fulcrum shaft and the installation fulcrum shaft are rotationally arranged on the wall plate and can axially slide relative to the wall plate, a supporting mechanism is arranged between the installation fulcrum shaft and the wall plate, an air cavity is formed in the inflation main shaft, a plurality of air outlets communicated with the air cavity are evenly formed in the surface of the inflation main shaft, and a machine shell is arranged on the wall plate. One end of the inflation fulcrum shaft penetrates through the wall plate and extends into the machine shell, an inflation inlet is formed in the side wall of the inflation fulcrum shaft, the inflation fulcrum shaft is provided with an air inlet pipeline communicated with the inflation inlet and an air cavity in the inflatable main shaft in the axial direction of the inflation fulcrum shaft, and an inflation device used for supplying air to the inflation inlet is arranged on the machine shell. The utility model has the advantages of accurate and reliable gas circuit butt joint, high-efficiency plate changing process, convenience in maintenance and replacement, improved automation level and operation efficiency of equipment, and the like.

Description

Technical Field

[0001] This utility model relates to the field of printing machinery technology, and in particular to an air-expanding roller for rotary offset printing plates. Background Technology

[0002] Rotary offset printing is one of the main processes in high-speed printing production. Its core component, the printing plate cylinder, usually needs to be replaced frequently to adapt to different printing requirements. The installation and removal of traditional printing plate cylinders are mostly carried out by mechanical locking or bolt fastening, which is cumbersome, time-consuming, and requires a high level of technical proficiency from the operators. Especially on high-speed rotary printing presses, the downtime for changing plates directly affects production efficiency and production costs. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a rotary offset printing plate air expansion cylinder that can realize a series of actions such as axial movement of the printing plate cylinder, air circuit docking, and air-filling plate unloading, shorten plate change time, and improve the automation level and operating efficiency of the equipment.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a rotary offset printing plate air-expanding roller, comprising two opposing wall plates, a mandrel rotatably disposed between the two wall plates, a printing plate roller sleeved on the mandrel, the mandrel being able to slide axially relative to the wall plates, the mandrel comprising an air-expanding main shaft, an inflation support shaft, and a mounting support shaft, the inflation support shaft and the mounting support shaft being respectively fixedly connected to both ends of the air-expanding main shaft, the printing plate roller being sleeved on the air-expanding main shaft, and the inflation support shaft and the mounting support shaft being rotatably disposed on the two wall plates. All components on the wall panel can slide axially relative to the wall panel. A support mechanism is provided between the mounting shaft and the wall panel to enable quick assembly and disassembly of the mounting shaft. An air chamber is provided inside the air expansion main shaft. Several air outlets communicating with the air chamber are evenly distributed on the surface of the air expansion main shaft. A housing is provided on the wall panel. One end of the inflation support shaft extends through the wall panel into the housing and has an inflation port on its side wall. An air inlet pipe communicating with the inflation port and the air chamber inside the air expansion main shaft is provided along its axial direction on the inflation support shaft. An inflation device for supplying air to the inflation port is provided on the housing.

[0005] Preferably, the inflation device includes an inflation base, an inflation head, and a telescopic component. The inflation base is disposed on the outer wall of the housing. The inflation head is slidably disposed within the inflation base along its axial direction, and its inflation end extends through the housing into the housing. The inflation head is connected to a compressed air source. The telescopic mechanism is disposed at the rear end of the inflation head to drive the inflation head to slide, so that its inflation end can extend into or out of the inflation port of the inflation support shaft.

[0006] Preferably, the inflation port of the inflation support shaft and the inflation end of the inflation head are both configured as mutually compatible wedge-shaped structures, and the outer wall of the inflation end of the inflation head is fitted with a sealing ring for forming a seal with the inner wall of the inflation port.

[0007] Preferably, the housing is further provided with a circumferential rotation drive for driving the mandrel to rotate about its axis, and an axial movement drive for driving the mandrel to slide along its axial direction.

[0008] Preferably, the circumferential rotation drive device includes a circumferential servo motor, a reducer, an input gear, an output gear, and a first coupling. The output gear is fixedly sleeved on the end of the inflatable support shaft extending into the housing. The input gear is rotatably mounted in the housing via a transmission shaft and meshes with the output gear. The circumferential servo motor and the reducer are mounted on the housing. The output shaft of the circumferential servo motor is connected to the transmission shaft via the reducer and the first coupling to drive the spindle to rotate.

[0009] Preferably, the axial movement drive device includes an axial servo motor, a ball screw, and a screw nut. The ball screw is connected to the end of the inflatable support shaft extending into the housing via an axial coupling. The screw nut is mounted on the housing and its inner hole is threaded to the external thread of the ball screw. The ball screw has an inner hole along its axial direction, and a connecting shaft is connected to the inner hole via a key. The connecting shaft is connected to the axial servo motor via a second coupling.

[0010] Preferably, the inflatable support shaft and the mounting support shaft are fixedly connected to both ends of the air-expanding main shaft by welding.

[0011] This invention has the advantages of precise and reliable gas path connection, efficient plate changing process, easy maintenance and replacement, and improved equipment automation level and operating efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic front sectional view of the overall structure of an embodiment of this utility model;

[0013] Figure 2 This is a utility model Figure 1 Enlarged view of point A;

[0014] Figure 3 This is a utility model Figure 1 Enlarged view of point B.

[0015] In the diagram: 1. Wall panel; 2. Mandrel; 21. Air expansion spindle; 22. Inflation support shaft; 23. Mounting support shaft; 24. Air chamber; 25. Air outlet; 26. Inflation port; 27. Air inlet pipe; 3. Printing cylinder; 4. Support mechanism; 5. Housing; 6. Inflation device; 61. Inflation seat; 62. Inflation head; 63. Telescopic component; 64. Sealing ring; 7. Circumferential rotation drive device; 71. Circumferential servo motor; 72. Reducer; 73. Input gear; 74. Output gear; 75. First coupling; 76. Transmission shaft; 8. Axial movement drive device; 81. Axial servo motor; 82. Ball screw; 83. Screw nut; 84. Axial coupling; 85. Inner hole; 86. Connecting shaft; 87. Second coupling. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0017] Example: Figures 1 to 3 The rotary offset printing plate air-expanding cylinder shown includes two opposing wall plates 1 fixed to the frame of a printing press. A mandrel 2 is rotatably mounted between the two wall plates 1 via bearings. The mandrel 2 can slide axially relative to the wall plates 1. A printing plate cylinder 3 is sleeved on the mandrel 2. The mandrel 2 includes an air-expanding main shaft 21, an inflatable support shaft 22, and a mounting support shaft 23. The inflatable support shaft 22 and the mounting support shaft 23 are respectively fixedly connected to both ends of the air-expanding main shaft 21. The ends of the inflatable support shaft 22 and the mounting support shaft 23 are respectively machined with steps. The inflatable support shaft 22 and the mounting support shaft 23 are respectively fixedly connected to both ends of the air-expanding main shaft 21 by welding to form an integral rigid shaft. The printing plate cylinder 3 is sleeved on the air-expanding main shaft 21.

[0018] The pneumatic spindle 21 is a thick-walled cylindrical structure with a sealed cylindrical air chamber 24 machined inside. Multiple small holes 25 are evenly distributed along the circumferential and axial directions on the surface of the pneumatic spindle 21, connecting the air chambers 24. A housing 5 is mounted on the wall plate 1. The inflatable support shaft 22 is a solid stepped shaft. One end of the inflatable support shaft 22 passes through the wall plate 1 and is supported by a bearing (the bearing selection can be determined based on actual conditions, such as a linear rotary bearing). Its end extends into the housing 5 and has a wedge-shaped inflation port 26 radially opened. A long, narrow hole along its axial direction is provided inside the inflatable support shaft 22 as an air inlet pipe 27 connecting the inflation port 26 and the air chambers 24 inside the pneumatic spindle 21. A support mechanism 4 (the support mechanism is existing technology and therefore not described) is provided between the mounting support shaft 23 and the wall plate 1 to enable quick assembly and disassembly of the mounting support shaft 23. When the support mechanism 4 is released, the mounting support shaft 23 can move or be disassembled along the guide surface of the wall plate 1, thereby releasing the axial constraint on the spindle 2.

[0019] The housing 5 is equipped with an inflation device 6 for supplying air to the inflation port 26. The inflation device 6 includes an inflation base 61, an inflation head 62, and a telescopic assembly 63. The inflation base 61 is fixedly installed on the outer wall of the housing 5. The inflation head 62 is slidably installed in the inflation base 61 along its axial direction, and its inflation end extends through the housing 5 into the interior of the housing 5. The rear end of the inflation head 62 is connected to a compressed air source (such as an inflation cylinder) through a pipeline. The telescopic mechanism (such as a linear air cylinder) is... A cylinder is located at the rear end of the inflation head 62 to drive the inflation head 62 to slide, so that its inflation end can extend into or exit the inflation port 26 of the inflation support shaft 22. The inflation end of the inflation head 62 is configured as a wedge-shaped structure. The outer wall of the inflation end of the inflation head 62 is fitted with a sealing ring 64 for forming a seal with the inner wall of the inflation port 26. When inflation is required, the inflation head 62 moves forward, and its wedge-shaped front end is inserted into the wedge-shaped inflation port 26 of the inflation support shaft 22, and the sealing ring 64 achieves a seal.

[0020] The housing 5 is equipped with a circumferential rotation drive device 7 for driving the mandrel 2 to rotate around its axis. The circumferential rotation drive device 7 includes a circumferential servo motor 71, a reducer 72, an input gear 73, an output gear 74, and a first coupling 75. The output gear 74 is fixedly sleeved on the end of the inflatable support shaft 22 extending into the housing 5 via a key connection. The input gear 73 is rotatably mounted in the housing 5 via a transmission shaft 76 and meshes with the output gear 74. The circumferential servo motor 71 and the reducer 72 are mounted on the housing 5. The output shaft of the circumferential servo motor 71 is connected to the transmission shaft 76 via the reducer 72 and the first coupling 75 to drive the mandrel 2 to rotate. By controlling the circumferential servo motor 71, the circumferential angle of the printing plate cylinder 3 can be precisely controlled.

[0021] The housing 5 is equipped with an axial movement drive device 8 for driving the spindle 2 to slide along its axial direction. The axial movement drive device 8 includes an axial servo motor 81, a ball screw 82, and a screw nut 83. The ball screw 82 is connected to the end of the inflatable support shaft 22 extending into the housing 5 via an axial coupling 84. The screw nut 83 is disposed on the housing 5 and its inner hole 85 is threaded to the external thread of the ball screw 82. The ball screw 82 has an inner hole 85 along its axial direction, and a connecting shaft 86 is connected to the inner hole 85 via a key. The connecting shaft 86 is connected to the axial servo motor 81 via a second coupling 87. When the axial servo motor 81 rotates, it drives the ball screw 82 to rotate. Since the screw nut 83 is fixed, the ball screw 82 drives the spindle 2 to make an axial linear motion. The moving distance and speed are precisely controlled by the servo motor.

[0022] During operation, the circumferential servo motor 71 drives the printing plate cylinder 3. When changing the printing plate cylinder 3, the circumferential servo motor 71 drives the spindle 2 to rotate to a designated position. The operator or automatic mechanism releases the support mechanism 4. Then, the axial servo motor 81 starts and drives the spindle 2 to move a predetermined distance so that the inflation port 26 is aligned with the inflation head 62. The telescopic component 63 pushes the inflation head 62 into the inflation port 26 and seals it. Compressed air from the compressed air source enters the air chamber 24 through the inflation head 62, the inflation port 26, and the air inlet pipe 27, and is then sprayed out from the air outlet 25. An air cushion is formed between the inner hole 85 of the printing plate cylinder 3 and the outer circle of the air-expanding spindle 21. At this time, the printing plate cylinder 3 is in a "suspended" state with minimal friction, and the printing plate cylinder 3 can be easily pulled out axially. Then, a new printing plate cylinder 3 is installed. During installation, the inner hole 85 of the printing plate cylinder 3 is expanded under the continuous action of compressed air, and the printing plate cylinder 3 can be easily installed on the mandrel 2. After installation, the air supply is stopped, the printing plate cylinder 3 retracts and hugs the mandrel 2, and the axial servo motor 81 pulls the mandrel 2 back to its original position and locks the support mechanism 4, thus completing the replacement.

Claims

1. A rotary offset printing plate inflation cylinder, comprising two oppositely arranged wallboards (1), a mandrel (2) is rotatably arranged between the two wallboards (1), and a printing plate cylinder (3) is sleeved on the mandrel (2), characterized in that: The core shaft (2) can make axial sliding movement relative to the wallboard (1), the core shaft (2) includes a gas expansion main shaft (21), a gas charging branch shaft (22) and a mounting branch shaft (23), the gas charging branch shaft (22) and the mounting branch shaft (23) are fixedly connected to the two ends of the gas expansion main shaft (21) respectively, the plate cylinder (3) is sleeved on the gas expansion main shaft (21), the gas charging branch shaft (22) and the mounting branch shaft (23) are rotatably arranged on the two wallboards (1) respectively and can make axial sliding movement relative to the wallboard (1), the mounting branch shaft (23) and the wallboard (1) are provided with a supporting mechanism (4) capable of realizing quick disassembly and assembly of the mounting branch shaft (23), the gas expansion main shaft (21) is internally provided with a gas cavity (24), the surface of the gas expansion main shaft (21) is uniformly provided with a plurality of gas outlets (25) communicating with the gas cavity (24), the wallboard (1) is provided with a machine shell (5), one end of the gas charging branch shaft (22) extends into the machine shell (5) through the wallboard (1) and is provided with a gas charging port (26) on the side wall, the gas charging branch shaft (22) is provided with an air inlet pipeline (27) communicating with the gas charging port (26) and the gas cavity (24) in the gas expansion main shaft (21) along the axial direction of the gas charging branch shaft (22), and the machine shell (5) is provided with a gas charging device (6) for supplying gas to the gas charging port (26).

2. The web-fed offset printing form expansion cylinder according to claim 1, characterized in that The gas charging device (6) includes a gas charging seat (61), a gas charging head (62) and a telescopic assembly (63), the gas charging seat (61) is arranged on the outer wall of the machine shell (5), the gas charging head (62) is arranged in the gas charging seat (61) and extends into the machine shell (5) through the machine shell (5) at the gas charging end, the gas charging head (62) is connected with a compressed air source, and the telescopic mechanism is arranged at the rear end of the gas charging head (62) and is used for driving the gas charging head (62) to slide so that the gas charging end can extend into or exit the gas charging port (26) of the gas charging branch shaft (22).

3. The web-fed offset printing form expansion cylinder according to claim 2, characterized in that: The gas charging port (26) of the gas charging branch shaft (22) and the gas charging end of the gas charging head (62) are all provided in a wedge-shaped structure matched with each other, and the outer wall of the gas charging end of the gas charging head (62) is sleeved with a sealing ring (64) for forming a seal with the inner wall of the gas charging port (26).

4. The web-fed lithographic printing form inflation cylinder of claim 1 wherein: The machine shell (5) is further provided with a circumferential rotation driving device (7) for driving the core shaft (2) to rotate around the axis and an axial movement driving device (8) for driving the core shaft (2) to slide along the axial direction.

5. The web offset printing form blow molding cylinder according to claim 4, characterized in that: The circumferential rotation driving device (7) includes a circumferential servo motor (71), a speed reducer (72), an input gear (73), an output gear (74) and a first coupling (75), the output gear (74) is fixedly sleeved on the end of the gas charging branch shaft (22) extending into the machine shell (5), the input gear (73) is rotatably arranged in the machine shell (5) through a transmission shaft (76) and is engaged with the output gear (74), the circumferential servo motor (71) and the speed reducer (72) are arranged on the machine shell (5), and the output shaft of the circumferential servo motor (71) is in transmission connection with the transmission shaft (76) through the speed reducer (72) and the first coupling (75) to drive the core shaft (2) to rotate.

6. The web offset printing form blow molding cylinder according to claim 4, characterized in that: The axial movement driving device (8) comprises an axial servo motor (81), a ball screw (82) and a screw nut (83), the ball screw (82) is connected with the end of the inflation support shaft (22) extending into the casing (5) through an axial shaft coupling (84), the screw nut (83) is arranged on the casing (5) and the inner hole (85) is screwed with the outer thread of the ball screw (82), the inner hole (85) is provided with a connecting shaft (86) through key connection along the axial direction of the ball screw (82), and the connecting shaft (86) is drivingly connected with the axial servo motor (81) through a second shaft coupling (87).

7. The web-fed lithographic printing form inflation cylinder of claim 1 wherein: The inflation support shaft (22) and the mounting support shaft (23) are fixedly connected with the gas inflation main shaft (21) at two ends through welding.

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