Offset printing equipment and method for producing cosmetic hoses

Abstract

The present invention provides offset printing equipment and method for producing cosmetic hoses, which relates to an offset printing structure, including a rubber roller, a circular surface of the rubber roller is provided with a group of U-shaped grooves extending in the axial direction, a group of tensioning roller groups are fed into the U-shaped groove of the rubber roller from one side of the rubber roller, and two groups of clamping groups suspended at both ends of the rubber roller are used to clamp the two ends of the tensioning roller group to position it in the U-shaped groove; the tensioning roller group includes two groups of pairs of frames, a tensioning roller body which is installed between the two groups of pairs of frames and driven to rotate by a group of motors on the pairs of frames, and a positioning group for pulling and positioning the tail end of the rubber cloth, and a clamping group is further provided in the U-shaped groove, and the clamping group is used to clamp and position the tail end of the rubber cloth when the positioning group releases the tail end of the rubber cloth and moves away from the tensioning roller body; the present invention can realize the rubber roller without disassembling, and the rubber cloth can be replaced directly online, so as to ensure debugging efficiency and save time and labor.

Description

Technical Field

[0001] The present invention relates to an offset printing structure, in particular to an offset printing device and method for producing cosmetic hoses. Background Art

[0002] The hose, as a convenient and economical packaging form, is very popular among the public. It is mainly used for packaging of liquids, pastes and other items, and is widely used in daily chemical, pharmaceutical, food and other industries. The printing method of the hose is closely related to the hose manufacturing process, which is mainly divided into two categories: one is to make the hose first and then print it, which is mainly used for extruded plastic hoses, and the printing methods are mainly letterpress offset printing and screen printing; the other is to print the plastic film (or composite sheet) first and then make the composite hose, which is mainly used for all-plastic composite hoses and aluminum-plastic composite hoses, and the printing methods are mainly flexographic printing and gravure printing, among which letterpress offset printing can According to customer requirements, we can determine the gloss and matte effects to achieve accurate image reproduction. It is a lithographic printing method that uses a rubber blanket to transfer the image on the printing plate to the substrate. The printing process is that the ink roller transfers the ink from the ink fountain to a set of rubber rollers. That is, through the inking roller, the ink is evenly distributed to the inking roller. The inking roller then transfers the ink to the image part of the relief plate attached to the plate cylinder. The raised image part is about 0.50mm higher than the blank part. The ink on the printing plate is then transferred to the rubber blanket of the rubber cylinder and then to the surface of the hose.

[0003] In the prior art, the rubber blanket is generally tightened by clamping parts at both ends, so that the rubber blanket is adhered to the surface of the rubber cylinder. For example, in a patented rubber cylinder clamping mechanism for a printing press (Announcement No. CN201427432), the rubber blanket is not directly bonded to the outside of the rubber cylinder, which facilitates subsequent replacement and maintenance of the rubber blanket. However, the replacement process of the rubber blanket still requires a lot of manual participation, which is not only time-consuming and labor-intensive, but also prone to folding during the process of winding the rubber cylinder. Therefore, continuous debugging is required, which is not conducive to the efficiency of maintenance and adjustment. Summary of the Invention

[0004] The purpose of the present invention is to provide an offset printing device and method for the production of cosmetic hoses, which can realize the rubber cloth replacement operation directly online without disassembling the rubber roller, so as to ensure debugging efficiency and save time and effort.

[0005] The present invention provides the following technical solutions:

[0006] An offset printing device and method for producing cosmetic hoses, comprising an inking roller for transferring ink to the relief printing plate portion of a plate roller, a rubber roller in rolling contact with the plate roller and for transferring ink from the relief printing plate portion of the plate roller to the outside of a lower hose, and a printing roller which is sleeved on the hose and driven by a lifting cylinder to rise and abut against the rubber roller for rotary transfer. The hose is sleeved on the outside of the printing roller, and each time printing is performed, the printing roller rises and presses against the rubber roller and then rotates to complete the transfer. The inking roller, the plate roller, and the rubber roller are in rolling contact with each other. The rotary drive structure of the printing roller and the printing roller are both existing technologies and will not be described in detail here. The roller ends of the blanket roller are mounted on the mounting frames on both sides and are driven by a group of motors mounted on the mounting frames to rotate and roll. The circular surface of the blanket roller is provided with a group of U-shaped grooves extending along the axial direction. A group of tensioning rollers is fed from one side of the blanket roller into the U-shaped groove of the blanket roller. Two groups of clamping groups suspended at both ends of the blanket roller are used to clamp the two ends of the tensioning roller group to position it in the U-shaped groove.

[0007] The tensioning roller group includes two pairs of frames, a tensioning roller body installed between the two pairs of frames and driven to rotate by a second motor on the frames, and a positioning group for pulling and positioning the tail end of the rubber cloth. The tensioning roller body is used to clamp and position the first section of the rubber cloth, and after the rubber cloth is wound around the surface, the tail end of the rubber cloth is pulled and positioned by the positioning group. A clamping group is also provided in the U-shaped slot, and the clamping group is used to clamp and position the tail end of the rubber cloth when the positioning group releases the tail end of the rubber cloth and moves away from the tensioning roller body.

[0008] The clamping group includes a base plate, a rectangular guide bar, a guide block, a top cylinder and a clamping claw, the bottom of the base plate is provided with a guide block, the rectangular guide bar is provided with at least two groups and the corresponding guides are installed in the guide block, and a linear rack is also provided on the top side thereof, and a group of gears driven to rotate by a motor are installed at the bottom of the base plate, and the gears are meshed with the linear rack to drive the rectangular guide bar to reciprocate linearly through the linear rack, and the mounting frame and the U-shaped slot are also provided with a plug-in slot body for plugging and positioning with the rectangular guide bar. When one end of the rectangular guide bar is suspended and inserted into the mounting frame, the other end thereof is separated from the rubber roller. At this time, the tensioning group is fixed relative to the mounting frame, which is the state during replacement and debugging. On the contrary, it is fixed relative to the rubber roller, which is the state during rolling operation of the rubber roller. A clamping claw is fixed on the base plate through the top cylinder, and the top cylinder is used to drive the clamping claw to clamp and position the tensioning roller body;

[0009] Therefore, when the rubber blanket needs to be replaced and debugged, there is no need to disassemble the rubber drum. You only need to rotate the U-shaped groove of the rubber drum to one side after removing the old rubber blanket, so that the tension roller group with the rubber blanket installed can be sent into the U-shaped groove. Figure 2As shown, the clamping claws clamp the two ends of the tensioning roller body to position the tensioning roller group, and then the clamping group clamps the tail end of the rubber cloth, and the positioning group loosens the tail end of the rubber cloth and moves it away from the tensioning roller body, and the rectangular guide bar can be plugged into the mounting frame, so that the tensioning group can be fixed relative to the mounting frame, and then the top cylinder is lifted, and the tensioning roller group can be pushed out of the U-shaped groove. At the same time, with the rotation of motor 2, the tail end of the rubber cloth is known to have been positioned in the U-shaped groove by the clamping group. When the tensioning roller group is out of the U-shaped groove , Motor 2 is started first, and then Motor 1 is started again. Then, when the rubber roller rotates, the rubber cloth can also be wound around the surface of the rubber roller for one circle. After winding one circle, the top cylinder is retracted to drive the tensioning roller group back into the U-shaped slot again. At this time, the rubber cloth originally wound around the tensioning roller body has been fully unfolded. The top cylinder is retracted to tighten the rubber cloth, and then the rectangular guide bar of the clamping group is inserted into the rubber roller. When Motor 1 is started again and the rubber roller is rotated, the tensioning roller group can also rotate with the rubber roller.

[0010] When the rubber cloth needs to be replaced again, the rectangular guide bar of the clamping group can be inserted into the mounting frame, and then the top cylinder 1 can be lifted, and then the motor 2 and the motor 1 can be started, and they can rotate in the opposite direction to that when the rubber cloth was installed, so that the rubber cloth can be rolled up again, and the clamping group and the clamping claws can respectively release the clamping of the tail end of the rubber cloth and the tensioning roller body, and the tensioning roller group can drive the rolled rubber cloth to be received and replaced by the receiving device.

[0011] The U-shaped bottom plate is placed in a concave sliding groove opened at the top of a group of plug-in slots, and limit blocks are also provided on both sides of the concave sliding groove for limiting and blocking the top side of the U-shaped bottom plate, and the outer side surfaces of the two groups of splints are inclined surfaces facing the narrowed mouth of the U-shaped slot, and the pressure plate is attached to the inclined surface and is slidably connected to the splints along the inclined surface direction. Motor three is also installed on the U-shaped bottom plate, and the driving end of the motor three is connected to a threaded rod threadedly connected to the pressure plate, which is used to drive the threaded rod to rotate to drive the pressure plate to rise and fall along the inner wall of the U-shaped bottom plate, and then drive the two groups of splints to move in opposite directions to clamp or release the tail end of the rubber cloth.

[0012] Preferably, a group of arc-shaped covers are connected between the two groups of frames. The arc-shaped covers can provide a certain degree of protection for the structure in the U-shaped groove. At the same time, when the arc-shaped covers move to the arc surface corresponding to the surface of the rubber roller, they can also provide a short-term rolling support effect during rolling.

[0013] Preferably, the positioning group includes a stand mounted along a straight line on the concave surface of the arc-shaped cover, a screw threadedly connected to one end of the stand, and a finger clamp fixed to the other end of the stand, the finger clamp being used to clamp the tail end of the rubber cloth, the stand adapter being mounted in the pair of frames, and being driven to rotate by a set of four motors on the pair of frames.

[0014] Preferably, the distance between the limit block and the bottom of the groove of the concave sliding mouth is greater than the height of the U-shaped bottom plate. Therefore, there is an adjustment margin between the limit block and the bottom of the groove of the concave sliding mouth for adjusting the lifting of the U-shaped bottom plate. Therefore, an electric telescopic rod is further provided at the bottom end of the vertical frame. The electric telescopic rod is used to press the two ends of the U-shaped bottom plate to drive the U-shaped bottom plate to move toward the bottom of the groove of the concave sliding mouth, thereby pulling the tail end of the rubber cloth and the head end of the rubber cloth to be synchronously tightened.

[0015] The above design allows the tensioning roller to tighten the blanket after the blanket is laid, and the electric telescopic rod can press the rear end of the blanket to tighten it synchronously when the tensioning roller descends to tighten the blanket, thereby improving the tensioning effect of the blanket.

[0016] Preferably, the tensioning roller body includes two groups of semicircular rollers connected to form a cylindrical shape, and the two ends of the two groups of semicircular rollers are fixed and locked by clamps after being connected. Therefore, the end of the rubber cloth can be clamped between the semicircular rollers for locking and fixing. In order to ensure the stability of the locking, the connecting planes of the two groups of semicircular rollers can also be provided with raised blocks and grooves that are pressed together.

[0017] Preferably, a group of locking pins are also provided in the slot hole where the plug-in slot body and the rectangular guide bar are connected, and the end of the rectangular guide bar is provided with a locking slot that cooperates with the locking pins. When the rectangular guide bar is inserted into the slot hole of the plug-in slot body, the locking pin is driven by the top cylinder to be inserted and positioned in the locking slot to achieve more stable locking.

[0018] Preferably, the printing rollers are provided in four groups, and one end of the four groups of printing rollers is mounted on a group of crosses in a cross-shaped transfer manner, the center transfer of the cross is mounted on a mounting frame on one side, the cross is driven to rotate by a motor five on the mounting frame, and the printing rollers are driven to rotate by a motor six at the end of the cross, and the cross includes a transfer block located in the center and branch blocks located at the ends of the cross and driven to rise and fall by four groups of electric telescopic cylinders;

[0019] Therefore, the four groups of printing rollers can correspond to four working positions, namely, transfer position, unloading position, loading position and idle position. At the transfer position, the electric telescopic cylinder drives the printing roller to rise and abut against the rubber roller, and the motor drives the printing roller to rotate for printing. At the unloading position, it can cooperate with the external pull rod and pull claw to grab the hose outside the printing roller and pull it out from the outside of the printing roller. At the loading position, it can cooperate with the external push rod and push claw to put the hose onto the outside of the printing roller. At the idle position, you can wait before work.

[0020] An offset printing method for producing a cosmetic hose, based on the above-mentioned offset printing equipment for producing a cosmetic hose, comprises the following steps:

[0021] S1: When a set of printing rollers rotates to the transfer position, the electric telescopic cylinder at the transfer position drives the printing rollers to rise until they abut against the rubber roller. Motor 6 drives the printing rollers to rotate and cooperate with the rotation of the rubber roller to perform printing. After printing is completed, the electric telescopic cylinder at the transfer position drives the printing rollers to descend, so that the hose is separated from the rubber roller.

[0022] S2: Then the motor 5 is started, the cross rotates 90 degrees, and the hose that has completed the transfer in S1 rotates to the unloading position. At the unloading position, the pull rod drives the pull claw to move forward to grab the hose outside the printing roller, and pull it away from the outside of the printing roller when the pull rod retreats;

[0023] S3: Then the motor 5 is started again, the cross rotates 90 degrees again, and the printing roller that has completed unloading in S2 rotates to the loading position. At the loading position, the push rod drives the push claw to move forward and put the hose grasped by the push claw onto the outside of the printing roller. Then, the push rod retreats away from the printing roller.

[0024] S4: Then the motor 5 is started again, the cross rotates 90 degrees again, and the printing roller that has completed the loading in S3 rotates to the idle position. In the idle position, you can wait before working, and after the motor 5 is started again and the cross rotates 90 degrees again, it enters the cycle of S1.

[0025] The beneficial effects of the present invention are:

[0026] The offset printing equipment of the present invention can realize the rubber cloth replacement operation directly online without disassembling the rubber roller, so as to ensure the debugging efficiency and save time and labor. The specific method of online replacement of the rubber cloth is as follows: when it is necessary to replace and debug the rubber cloth, the U-shaped groove of the rubber roller can be rotated to one side after removing the old rubber cloth, so that the tensioning roller group installed with the rubber cloth is sent into the U-shaped groove, and the clamping claws clamp the two ends of the tensioning roller body to position the tensioning roller group, and then the clamping group clamps the tail end of the rubber cloth, the positioning group loosens the tail end of the rubber cloth and moves away from the tensioning roller body, and the rectangular guide bar can be plugged into the mounting frame, so that the tensioning group can be fixed relative to the mounting frame, and then the cylinder can be pushed. When the rubber drum is rotated, the rubber cloth can be wound around the surface of the rubber drum for one circle. After the rubber cloth is wound around the rubber drum, the top cylinder is retracted to drive the tensioning roller group back into the U-shaped groove. At this time, the rubber cloth originally wound around the outside of the tensioning roller has been fully unfolded. The rubber cloth can be tightened by retracting the top cylinder, and then the rectangular guide bar of the clamping group is inserted into the rubber drum. When the motor one is started again and the rubber drum is rotated, the tensioning roller group can also rotate with the rubber drum.

[0027] When the rubber cloth needs to be replaced again, the rectangular guide bar of the clamping group can be inserted into the mounting frame, and then the top cylinder 1 can be lifted, and then the motor 2 and the motor 1 can be started, and they can rotate in the opposite direction to that when the rubber cloth was installed, so that the rubber cloth can be rolled up again, and the clamping group and the clamping claws can respectively release the clamping of the tail end of the rubber cloth and the tensioning roller body, and the tensioning roller group can drive the rolled rubber cloth to be received and replaced by the receiving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the process in Example 1 of the present invention;

[0030] Figure 2 It is a structural cross-sectional view along the axis when the rubber roller receives the tension roller group;

[0031] Figure 3 yes Figure 2 A partial schematic diagram in FIG.

[0032] Figure 4 1 is a schematic diagram of the side structure of the rubber cylinder;

[0033] Figure 5yes Figure 4 A partial schematic diagram in FIG.

[0034] Figure 6 This is a schematic diagram of the structure after the tension roller body is pushed out of the U-shaped groove of the rubber roller;

[0035] Figure 7 is based on Figure 6 Schematic diagram of the structure after the middle rubber roller rotates a certain angle;

[0036] Figure 8 is based on Figure 7 Schematic diagram of the structure after the middle rubber roller rotates one circle;

[0037] Figure 9 is based on Figure 7 A schematic diagram of the structure of the tensioning roller body returning to the U-shaped slot to tension the blanket;

[0038] Figure 10 This is a schematic diagram of the process in Example 2 of the present invention;

[0039] Markings in the figure:

[0040] 1. Ink roller; 2. Plate roller; 3. Blanket roller; 4. Printing roller; 5. Mounting frame; 6. Take-up roller assembly; 7. Clamping assembly; 8. Rubber blanket; 31. U-shaped slot; 32. Clamping assembly; 33. Plug slot; 34. Locking pin; 35. Locking slot; 61. Counterframe; 62. Take-up roller; 63. Positioning assembly; 64. Arc cover; 71. Base plate; 72. Rectangular guide bar; 73. Guide block; 74. Top cylinder 1; 75. Clamping jaw; 76. Linear gear Strip; 77, gear; 321, splint; 322, pressure plate; 323, U-shaped bottom plate; 324, concave slide; 325, limit block; 326, inclined surface; 327, threaded rod; 631, stand; 632, screw rod; 633, finger gripper; 634, electric telescopic rod; 100, transfer position; 200, unloading position; 300, loading position; 400, vacant position; 41, cross; 42, transfer block; 43, electric telescopic cylinder; 44, branch block. DETAILED DESCRIPTION

[0041] Example 1

[0042] like Figure 1-9As shown, an offset printing device for producing cosmetic hoses, in this embodiment, includes an inking roller 1 for transferring ink to the relief printing plate portion of the plate roller 2, a rubber roller 3 that is in rolling contact with the plate roller 2 and is used to transfer the ink on the relief printing plate portion of the plate roller 2 to the outside of the lower hose, and a printing roller 4 that is driven by a lifting cylinder to rise and abut against the rubber roller 3 after being sleeved on the hose for rotational transfer. The hose is sleeved on the outside of the printing roller 4, and each time printing is performed, the printing roller 4 rises and presses against the rubber roller 3 and then rotates to complete the transfer. The inking roller 1, the plate roller 2, and the rubber roller 3 are connected to each other. The rotary drive structures of the roller 3 and the printing roller 4 are all existing technologies and will not be described in detail here. The roller ends of the blanket cylinder 3 are connected to the mounting frames 5 on both sides and are driven by a group of motors installed on the mounting frames 5 to rotate and roll. The circular surface of the blanket cylinder 3 is provided with a group of U-shaped grooves 31 extending along the axial direction. A group of tensioning rollers 6 are fed from one side of the blanket cylinder 3 into the U-shaped grooves 31 of the blanket cylinder 3. Two groups of clamping groups 7 suspended at both ends of the blanket cylinder 3 are used to clamp the ends of the tensioning rollers 6 and position them in the U-shaped grooves 31.

[0043] The tensioning roller group 6 includes two pairs of frames 61, a tensioning roller body 62 which is installed between the two pairs of frames 61 and driven to rotate by a second motor on the frames 61, and a positioning group 63 for pulling and positioning the tail end of the rubber cloth 8. The tensioning roller body 62 is used to clamp and position the first section of the rubber cloth 8, and after the rubber cloth 8 is wound around the surface, the tail end of the rubber cloth 8 is pulled and positioned by the positioning group 63. A clamping group 32 is also provided in the U-shaped slot 31. The clamping group 32 is used to clamp and position the tail end of the rubber cloth 8 when the positioning group 63 releases the tail end of the rubber cloth 8 and moves away from the tensioning roller body 62.

[0044] The clamping group 7 includes a base plate 71, a rectangular guide bar 72, a guide block 73, a top cylinder 74 and a clamping claw 75. The bottom of the base plate 71 is provided with a guide block 73. The rectangular guide bar 72 is provided with at least two groups and the corresponding guides are installed in the guide block 73. The top side is also provided with a linear rack 76. The bottom of the base plate 71 is provided with a group of gears 77 driven by a motor to rotate. The gear 77 is engaged with the linear rack 76 to drive the rectangular guide bar 72 to move back and forth linearly through the linear rack 76. The mounting frame 5 and the U-shaped slot A plug-in slot 33 is also provided in 31 for plugging and positioning with the rectangular guide bar 72. When one end of the rectangular guide bar 72 is suspended and inserted into the mounting frame 5, the other end thereof is separated from the rubber roller. At this time, the tensioning group is fixed relative to the mounting frame 5, which is the state during replacement and debugging. Conversely, it is fixed relative to the rubber roller, which is the state when the rubber roller is rolling. A clamping claw 75 is fixed on the base plate 71 through a top cylinder 74. The top cylinder 74 is used to drive the clamping claw 75 to clamp and position the tensioning roller body 62.

[0045] The holding group 32 includes two groups of clamping plates 321 arranged opposite to each other, pressure plates 322 arranged on both sides of the two groups of clamping plates 321, and a U-shaped bottom plate 323 for accommodating the clamping plates 321 and the pressure plates 322. The U-shaped bottom plate 323 is placed in a concave sliding opening 324 opened at the top of a group of plug-in slots 33. The concave sliding opening 324 is further provided with a limit block 325 on both sides of the concave sliding opening 324 for limiting the top side of the U-shaped bottom plate 323, and the outer side surfaces of the two groups of clamping plates 321 are facing the U-shaped slot 31. The notch-shaped inclined surface 326, the pressure plate 322 is fitted on the inclined surface 326, and is slidably connected to the clamping plate 321 along the inclined direction. A motor three is also installed on the U-shaped bottom plate 323, and the driving end of the motor three is connected to a threaded rod 327 threadedly connected to the pressure plate 322, which is used to drive the threaded rod 327 to rotate to drive the pressure plate 322 to rise and fall along the inner wall of the U-shaped bottom plate 323, and then drive the two sets of clamping plates 321 to move in opposite directions to clamp or loosen the tail end of the rubber cloth 8.

[0046] A set of arc-shaped covers 64 are also connected between the two sets of frames 61. The arc-shaped covers 64 can provide a certain degree of protection for the structure inside the U-shaped slot 31. At the same time, when the arc-shaped covers 64 move to the arc surface corresponding to the surface of the rubber roller 3, they can also provide a short-term rolling support effect during rolling.

[0047] The positioning group 63 includes a stand 631 that is linearly slidably mounted on the concave surface of the arc-shaped cover 64, a screw rod 632 that is threadedly connected to one end of the stand 631, and a finger clamp 633 fixed to the other end of the stand 631. The finger clamp 633 is used to clamp the tail end of the rubber cloth 8. The stand 631 is installed in the pair frame 61 and is driven to rotate by a group of motors 4 on the pair frame 61.

[0048] The distance between the limit block 325 and the bottom of the groove of the concave sliding opening 324 is greater than the height of the U-shaped bottom plate 323. Therefore, there is an adjustment margin between the limit block 325 and the bottom of the groove of the concave sliding opening 324 for adjusting the lifting of the U-shaped bottom plate 323. Therefore, the bottom end of the vertical frame 631 is also provided with an electric telescopic rod 634. The electric telescopic rod 634 is used to press the two ends of the U-shaped bottom plate 323 to drive the U-shaped bottom plate 323 to move toward the bottom of the groove of the concave sliding opening 324, thereby pulling the tail end of the rubber cloth 8 and the head end of the rubber cloth 8 to be synchronously tightened.

[0049] The above design allows the tensioning roller 62 to cooperate with the electric telescopic rod 634 to press the tail end of the blanket 8 and simultaneously tighten the blanket 8 after the blanket 8 is laid, thereby improving the tensioning effect of the blanket 8.

[0050] The tensioning roller body 62 is composed of two groups of semicircular rollers connected to form a cylindrical shape, and the two ends of the two groups of semicircular rollers are fixed and locked by clamps after being connected. Therefore, the end of the rubber cloth 8 can be clamped between the semicircular rollers for locking and fixing. In order to ensure the stability of the locking, the connecting planes of the two groups of semicircular rollers are also provided with raised blocks and grooves that are pressed together.

[0051] A group of locking pins 34 are also provided in the slot hole where the plug-in slot body 33 and the rectangular guide bar 72 are connected. The end of the rectangular guide bar 72 is provided with a locking slot 35 that cooperates with the locking pin 34. When the rectangular guide bar 72 is inserted into the slot hole of the plug-in slot body 33, the locking pin 34 is driven by the top cylinder to be inserted and positioned in the locking slot 35 to achieve more stable locking.

[0052] Example 2

[0053] like Figure 10 As shown, an offset printing device for producing cosmetic tubes is provided. In this embodiment, four sets of printing rollers 4 are provided, and one end of each set of printing rollers 4 is mounted on a set of crosses 41 in a cross-shaped transfer manner. The center of the crosses 41 is mounted on a mounting frame 5 on one side. The crosses 41 are driven to rotate by a motor 5 on the mounting frame 5, and the printing rollers 4 are driven to rotate by a motor 6 at the end of the cross 41. The cross 41 includes a transfer block 42 at the center and branch blocks 44 at the ends of the cross and driven to rise and fall by four sets of electric telescopic cylinders 43.

[0054] Therefore, the four groups of printing rollers 4 can correspond to four working positions, namely, the transfer position 100, the unloading position 200, the loading position 300, and the vacant position 400. At the transfer position 100, the electric telescopic cylinder 43 drives the printing roller 4 to rise and abut against the rubber roller 3, and the motor 6 drives the printing roller 4 to rotate for printing. At the unloading position 200, the external pull rod and pull claw can be cooperated to grab the hose outside the printing roller 4 and pull it out from the outside of the printing roller 4. At the loading position 300, the external push rod and push claw can be cooperated to put the hose onto the outside of the printing roller 4. At the vacant position 400, you can wait before work.

[0055] An offset printing method for producing a cosmetic hose, based on the above-mentioned offset printing equipment for producing a cosmetic hose, comprises the following steps:

[0056] S1: When a set of printing rollers 4 rotate to the transfer position 100, the electric telescopic cylinder 43 of the transfer position 100 drives the printing rollers 4 to rise until they abut against the blanket cylinder 3. The motor 6 drives the printing rollers 4 to rotate and cooperate with the rotation of the blanket cylinder 3 to perform printing. After printing is completed, the electric telescopic cylinder 43 of the transfer position 100 drives the printing rollers 4 to descend, so that the hose is separated from the blanket cylinder 3.

[0057] S2: Then the motor 5 is started, the cross 41 rotates 90 degrees, and the hose that has completed the transfer in S1 rotates to the unloading position 200. At the unloading position 200, the pull rod drives the pull claw to move forward to grab the hose outside the printing roller 4, and pull it away from the outside of the printing roller 4 when the pull rod retreats;

[0058] S3: Then the motor 5 is started again, the cross 41 rotates 90 degrees again, and the printing roller 4 that has completed unloading in S2 rotates to the loading position 300. At the loading position 300, the push rod drives the push claw to move forward and insert the hose grasped by the push claw into the outside of the printing roller 4. Then, the push rod retreats away from the printing roller 4.

[0059] S4: Then the motor 5 is started again, the cross 41 rotates 90° again, and the printing roller 4 that has completed the loading in S3 rotates to the idle position 400. At the idle position 400, waiting before work can be carried out, and after the motor 5 is started again and the cross 41 rotates 90° again, the cycle of S1 is entered.

[0060] The working principle of the present invention is:

[0061] When the rubber blanket 8 needs to be replaced and debugged, there is no need to disassemble the rubber cylinder 3. It is only necessary to rotate the U-shaped slot 31 of the rubber cylinder to one side after removing the old rubber blanket 8, so that the tensioning roller group 6 with the rubber blanket 8 installed is fed into the U-shaped slot 31. Figure 2 As shown, the clamping claws 75 clamp the two ends of the tensioning roller body 62 to position the tensioning roller group 6, and then the clamping group 32 clamps the tail end of the rubber cloth 8, the positioning group 63 relaxes the tail end of the rubber cloth 8 and moves away from the tensioning roller body 62, and the rectangular guide bar 72 can be plugged into the mounting frame 5, so that the tensioning group can be fixed relative to the mounting frame 5, and then the top cylinder 74 is lifted, and the tensioning roller group 6 can be pushed out of the U-shaped slot 31. At the same time, with the rotation of the motor 2, the tail end of the rubber cloth 8 is known to have been positioned in the U-shaped slot 31 by the clamping group 32. When the tensioning roller group 6 is out of the U-shaped slot 31, When the rubber drum is away from the U-shaped slot 31, the second motor is started first, and the first motor is started again. Then, when the rubber drum rotates, the rubber cloth 8 can also be wound around the surface of the rubber drum for one circle. After winding one circle, the top cylinder 1 74 retracts, and the tensioning roller group 6 can be driven back into the U-shaped slot 31 again. At this time, the rubber cloth 8 originally wound outside the tensioning roller body 62 has been fully unfolded. The retraction of the top cylinder 1 74 can realize the tightening of the rubber cloth 8, and then the rectangular guide bar 72 of the clamping group 7 is inserted into the rubber drum. When the motor 1 is started again and the rubber drum is rotated, the tensioning roller group 6 can also rotate with the rubber drum.

[0062] When the rubber cloth 8 needs to be replaced again, the rectangular guide bar 72 of the clamping group 7 can be inserted into the mounting frame 5, and then the top cylinder 74 is lifted, and then the motor 2 and the motor 1 are started, and they rotate in the opposite direction to when the rubber cloth 8 is installed, so that the rubber cloth 8 can be rolled up again, and the clamping group 32 and the clamping claws 75 respectively release the clamping of the tail end of the rubber cloth 8 and the tensioning roller body 62, and the tensioning roller group 6 can drive the rolled-up rubber cloth 8 to be received and replaced by the receiving device.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An offset printing device for producing cosmetic hoses, comprising an inking roller (1) for transferring ink to a relief printing plate portion of a plate roller (2), a rubber roller (3) in rolling contact with the plate roller (2) and for transferring ink from the relief printing plate portion of the plate roller (2) to the outside of a lower hose, and a printing roller (4) for being driven by a lifting cylinder to rise and abut against the rubber roller (3) after being sleeved on the hose for rotary transfer, characterized in that: The roller ends of the rubber roller (3) are mounted on the mounting frames (5) on both sides and driven by a group of motors mounted on the mounting frames (5) to rotate and roll. The circular surface of the rubber roller (3) is provided with a group of U-shaped slots (31) extending in the axial direction. A group of tensioning rollers (6) are fed from one side of the rubber roller (3) into the U-shaped slots (31) of the rubber roller (3). Two groups of clamping groups (7) suspended at both ends of the rubber roller (3) are used to clamp the two ends of the tensioning roller group (6) to position it in the U-shaped slots (31). The tensioning roller group (6) includes two pairs of frames (61), a tensioning roller body (62) installed between the two pairs of frames (61) and driven to rotate by a group of motors on the frames (61), and a positioning group (63) for pulling and positioning the tail end of the rubber cloth (8). The tensioning roller body (62) is used to clamp the first section of the rubber cloth (8), and after the rubber cloth (8) is wound around the surface, the tail end of the rubber cloth (8) is pulled and positioned by the positioning group (63). A clamping group (32) is also provided in the U-shaped slot (31). The clamping group (32) is used to clamp and position the tail end of the rubber cloth (8) when the positioning group (63) loosens the tail end of the rubber cloth (8) and moves away from the tensioning roller body (62). The clamping group (7) includes a base plate (71), a rectangular guide bar (72), a guide block (73), a top cylinder (74) and a clamping claw (75). The base plate (71) is provided with a guide block (73) at the bottom. The rectangular guide bar (72) is provided with at least two groups and the corresponding guides are installed in the guide block (73). A linear rack (76) is also provided on the top side. A group of gears (77) driven by a motor for rotation is installed at the bottom of the base plate (71). The gears (77) are provided with a plurality of gears (77) driven by a motor for rotation. ) is engaged with the linear rack (76) and is used to drive the rectangular guide bar (72) to move back and forth in a straight line through the linear rack (76); the mounting frame (5) and the U-shaped slot (31) are also provided with a plug-in slot (33) for plugging and positioning with the rectangular guide bar (72); a clamping claw (75) is fixed on the base plate (71) through a top cylinder (74); the top cylinder (74) is used to drive the clamping claw (75) to clamp and position the tensioning roller body (62).

2. The offset printing equipment for producing cosmetic hoses according to claim 1, characterized in that: The clamping group (32) includes two groups of clamping plates (321) arranged opposite to each other, pressure plates (322) arranged on both sides of the two groups of clamping plates (321), and a U-shaped bottom plate (323) for accommodating the clamping plates (321) and the pressure plates (322). The U-shaped bottom plate (323) is placed in a concave sliding opening (324) opened at the top of a group of plug-in slots (33). The concave sliding opening (324) is further provided with a limiting block (325) on both sides for limiting and blocking the top side of the U-shaped bottom plate (323). The outer side surfaces of the two groups of clamping plates (321) are facing the U-shaped slot ( 31) a notch-shaped inclined surface (326), the pressing plate (322) is fitted on the inclined surface (326) and is slidably connected to the clamping plate (321) along the inclined surface direction, and a motor three is also installed on the U-shaped bottom plate (323), the driving end of the motor three is connected to a threaded rod (327) threadedly connected in the pressing plate (322), which is used to drive the threaded rod (327) to rotate to drive the pressing plate (322) to rise and fall along the inner wall of the U-shaped bottom plate (323), and then drive the two sets of clamping plates (321) to move in opposite directions to clamp or loosen the tail end of the rubber cloth (8).

3. The offset printing equipment for producing cosmetic hoses according to claim 2, characterized in that: A set of arc-shaped covers (64) is also connected between the two sets of pairs of frames (61).

4. The offset printing equipment for producing cosmetic hoses according to claim 3, characterized in that: The positioning group (63) includes a stand (631) mounted on the concave surface of the arc-shaped cover (64) along a straight line, a screw rod (632) threadedly connected to one end of the stand (631), and a finger clamp (633) fixed to the other end of the stand (631), wherein the finger clamp (633) is used to clamp the tail end of the rubber cloth (8), and the stand (631) is installed in the counter-frame (61) and is driven to rotate by a set of four motors on the counter-frame (61).

5. The offset printing equipment for producing cosmetic hoses according to claim 4, characterized in that: The distance between the limit block (325) and the bottom of the groove of the concave sliding opening (324) is greater than the height of the U-shaped bottom plate (323). The bottom end of the stand (631) is also provided with an electric telescopic rod (634). The electric telescopic rod (634) is used to press the two ends of the U-shaped bottom plate (323) to drive the U-shaped bottom plate (323) to move toward the bottom of the groove of the concave sliding opening (324), thereby pulling the tail end of the rubber cloth (8) and the head end of the rubber cloth (8) to be tightened synchronously.

6. The offset printing equipment for producing cosmetic hoses according to claim 1, characterized in that: The tension roller body (62) comprises two groups of semicircular rollers butted together to form a cylindrical shape, and the two ends of the butted semicircular rollers are fixed and locked by clamps, and the butted surfaces of the two groups of semicircular rollers are also provided with protrusions and grooves that are press-fitted with each other.

7. The offset printing equipment for producing cosmetic hoses according to claim 1, characterized in that: A group of locking pins (34) are further provided in the slot holes where the plug-in slot body (33) and the rectangular guide bar (72) are docked. The ends of the rectangular guide bar (72) are provided with locking slots (35) that cooperate with the locking pins (34). When the rectangular guide bar (72) is inserted into the slot holes of the plug-in slot body (33), the locking pins (34) are driven by the top connection cylinder to be inserted and positioned in the locking slots (35).

8. The offset printing equipment for producing cosmetic hoses according to claim 1, characterized in that: The printing rollers (4) are provided in four groups, and one end of the four groups of printing rollers (4) is mounted on a group of crosses (41) in a cross-shaped transfer manner. The center transfer of the crosses (41) is mounted on a mounting frame (5) on one side. The crosses (41) are driven to rotate by a motor five on the mounting frame (5). The printing rollers (4) are driven to rotate by a motor six at the end of the cross (41). The cross (41) includes a transfer block (42) located in the center and a branch block (44) located at the end of the cross and driven to rise and fall by four groups of electric telescopic cylinders (43).

9. An offset printing method for producing cosmetic hoses, characterized in that: The offset printing equipment for producing cosmetic hoses according to claim 8 comprises the following steps: S1: When a group of printing rollers (4) rotate to the transfer position (100), the electric telescopic cylinder (43) of the transfer position (100) drives the printing roller (4) to rise until it abuts against the rubber roller (3), and the motor 6 drives the printing roller (4) to rotate and cooperates with the rotation of the rubber roller (3) to perform printing, and after the printing is completed, the electric telescopic cylinder (43) of the transfer position (100) drives the printing roller (4) to descend, so that the hose is separated from the rubber roller (3); S2: Then the motor 5 is started, the cross (41) rotates 90 degrees, and the hose that has completed the transfer in S1 rotates to the unloading position (200). At the unloading position (200), the pull rod drives the pull claw to move forward to grab the hose outside the printing roller (4), and pull it away from the outside of the printing roller (4) when the pull rod retreats; S3: Then the motor 5 is started again, the cross (41) rotates 90 degrees again, and the printing roller (4) that has completed unloading in S2 rotates to the loading position (300). At the loading position (300), the push rod drives the push claw to move forward and insert the hose grasped by the push claw into the outside of the printing roller (4). Then, the push rod moves back away from the printing roller (4); S4: Then the motor 5 is started again, the cross (41) rotates 90° again, and the printing roller (4) that has completed the loading in S3 rotates to the idle position (400). At the idle position (400), waiting before work can be carried out, and after the motor 5 is started again and the cross (41) rotates 90° again, the cycle of S1 is entered.

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