Automatic positioning mechanism for printing mandrels and positioning method thereof

Abstract

The application discloses an automatic positioning mechanism for a printing mandrel, comprising a wall plate, a linear guide rail fixed on the wall plate, a moving seat slidingly installed on the linear guide rail, a cylinder installed on the moving seat, a taper top fixedly connected to an extending end of the cylinder, a bearing fixed to one end of the taper top away from the extending end of the cylinder, a mandrel connected to the other end of the bearing, a sleeve fixedly connected to the mandrel through tensioning, and the mandrel being in a cantilever state. The automatic high-precision repeated positioning of the printing mandrel is realized through the forward and backward reciprocating action of the cylinder and the taper positioning between the taper top and the taper sleeve, so that the printing quality and the plate changing efficiency are improved. The application further discloses an automatic positioning method for a printing mandrel.

Description

Technical Field

[0001] This invention belongs to the field of printing machinery technology, and relates to an automatic positioning mechanism for printing mandrels; this invention also relates to an automatic positioning method for printing mandrels. Background Technology

[0002] In the flexographic printing industry, a beautiful design is inseparable from the design of the printing plate. Different designs correspond to different printing plates, which are typically attached to a sleeve using tape. In the daily operations of a printing plant, a single flexographic printing press often handles different printing tasks. Different tasks mean different designs, which in turn correspond to different printing plates. Therefore, changing the sleeve that connects to the printing plate is a common operation in printing plants. For the printing press, the sleeve and mandrel are connected by tension. When changing the sleeve, the support and positioning on the operating side of the mandrel need to be removed; after changing the sleeve, the support and positioning on the operating side of the mandrel need to be restored.

[0003] As can be seen from the above, mandrel repeatability is a crucial aspect of sleeve changing operations. The accuracy of mandrel repeatability directly impacts the final printing quality, while the ease of mandrel positioning affects plate change efficiency.

[0004] In existing technologies, such as Figure 1-2 As shown, when a plate change is required, the locking handle is manually released, and then the flipping seat is pulled out along the sliding shaft and flipped. After the sleeve is replaced, the flipping seat is flipped back to the initial position and pushed in. Finally, the locking handle is locked to complete the plate change operation. However, relying on the manual pushing and pulling of the flipping seat structure makes the operation in the change process more troublesome, the degree of automation is low, and the repeatability of the bearing is not high. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic positioning mechanism for printing mandrels. By using the reciprocating motion of a cylinder and the taper positioning between the cone tip and the cone sleeve, the automatic high-precision repeatable positioning of the printing mandrel is achieved, thereby improving printing quality and plate changing efficiency.

[0006] Another object of the present invention is to provide an automatic positioning method for printing mandrels.

[0007] The technical solution adopted in this invention is an automatic positioning mechanism for printing mandrels, including a wall plate, a linear guide rail fixed on the wall plate, a movable seat slidably mounted on the linear guide rail, a cylinder mounted on the movable seat, a conical top fixedly connected to the extended end of the cylinder, a bearing fixedly connected to one end of the conical top away from the extended end of the cylinder, a mandrel connected to the other end of the bearing, and a sleeve fixedly connected to the mandrel by tension, the mandrel being in a cantilever state.

[0008] The invention is further characterized in that:

[0009] The movable seat is provided with a slide groove that mates with the linear guide rail. The movable seat is mounted on the linear guide rail through the slide groove and slides on the linear guide rail.

[0010] The movable seat is provided with a through hole. The cylinder is fixedly connected to the end of the through hole away from the spindle by bolts. The extended end of the cylinder coincides with the axis of the through hole. When the extended end of the cylinder extends, it extends into the through hole.

[0011] A tapered sleeve is provided inside the end of the through hole away from the cylinder. The cone apex is located inside the tapered sleeve and the cone apex and the tapered sleeve are in tapered surface fit. The bearing is located inside the end of the cone apex away from the cylinder, and a pressure cap is provided on both the bearing and the cone apex. The pressure cap, bearing, and cone apex are fixedly connected as one unit by bolts.

[0012] The cone tip is fixedly connected to the cylinder extension end by bolts.

[0013] The cone sleeve and the movable seat are fixedly connected by screws.

[0014] Another technical solution adopted in this invention is an automatic positioning method for printing mandrels, which employs the aforementioned automatic positioning mechanism for printing mandrels, specifically as follows:

[0015] When the sleeve needs to be replaced, the cylinder retracts the cone tip, bearing, and gland together, separating the bearing and mandrel. Then, the moving seat moves along the linear guide rail, causing the moving seat to move the cylinder, cone tip, bearing, cone sleeve, and gland away from the sleeve insertion / removal position, and then the sleeve is replaced. After the replacement is completed, the moving seat is moved back to the initial position along the linear guide rail, and then the cylinder extends, causing the cone tip, bearing, and gland to extend together until the outer conical surface of the cone tip and the inner conical surface of the cone sleeve coincide. At this time, the cylinder stops moving and maintains the pre-intake pressure state, thereby making the bearing and mandrel tightly positioned together.

[0016] The beneficial effects of this invention are:

[0017] This invention improves upon the manual pull-out and push-in operation in the traditional mandrel positioning mechanism by adopting a cylinder mechanism, thereby increasing the automation level of the plate changing operation; it also improves upon the manual locking operation in the traditional mandrel positioning mechanism by adopting a conical surface fit, thereby improving the repeatability of the mandrel positioning, thus enhancing printing quality and plate changing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure in the prior art where the mandrel and bearing are separated;

[0019] Figure 2 This is a schematic diagram of the structure of the mandrel and bearing combination in the existing technology;

[0020] Figure 3 This is a schematic diagram of the structure of the automatic positioning mechanism for printing mandrels of the present invention when the cylinder retracts;

[0021] Figure 4 This is a schematic diagram of the structure of the automatic positioning mechanism for printing mandrels of the present invention when the cylinder extends.

[0022] In the diagram: 1. Wall panel, 2. Linear guide rail, 3. Moving seat, 4. Cylinder, 5. Conical top, 6. Bearing, 7. Conical sleeve, 8. Pressure cap, 9. Mandrel, 10. Sleeve, 11. Flip seat, 12. Handle, 13. Locking handle, 14. Slide groove, 15. Through hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] This invention relates to an automatic positioning mechanism for printing mandrels, the structure of which is as follows: Figure 3-4 As shown, it includes a wall panel 1, a linear guide rail 2 fixed on the wall panel 1, a movable seat 3 slidably mounted on the linear guide rail 2, a cylinder 4 mounted on the movable seat 3, a conical top 5 fixedly connected to the extended end of the cylinder 4, a bearing 6 fixedly connected to one end of the conical top 5 away from the extended end of the cylinder 4, a spindle 9 connected to the other end of the bearing 6, and a sleeve 10 fixedly connected to the spindle 9 by tensioning, and the spindle 9 is in a cantilever state.

[0025] The movable seat 3 is provided with a slide groove 14 that cooperates with the linear guide rail 2. The movable seat 3 is mounted on the linear guide rail 2 through the slide groove 14 and slides on the linear guide rail 2.

[0026] The movable base 3 is provided with a through hole 15. The cylinder 4 is fixedly connected to the end of the through hole away from the spindle 9 by bolts. The extended end of the cylinder 4 coincides with the axis of the through hole 15. When the extended end of the cylinder 4 extends out, it extends into the through hole 15.

[0027] A tapered sleeve 7 is provided inside the end of the through hole away from the cylinder 4. The tapered top 5 is located inside the tapered sleeve 7 and the tapered top 5 and the tapered sleeve 7 are in tapered surface fit. The bearing 6 is located inside the end of the tapered top 5 away from the cylinder 4, and a pressure cap 8 is provided on the bearing 6 and the tapered top 5. The pressure cap 8, the bearing 6, and the tapered top 5 are fixedly connected as one unit by bolts.

[0028] The working principle of Embodiment 1 of the present invention is as follows:

[0029] When sleeve 10 needs to be replaced, cylinder 4 drives cone 5, bearing 6, and gland 8 to retract together, such as Figure 3 As shown, bearing 6 and spindle 9 separate, and then the moving seat 3 moves along the linear guide rail 2, causing the moving seat 3 to drive cylinder 4, cone top 5, bearing 6, cone sleeve 7, and pressure cap 8 to avoid the insertion / removal position of sleeve 10. Then, sleeve 10 is replaced. After replacement, the moving seat 3 is moved back to the initial position along the linear guide rail 2, and then cylinder 4 extends, as shown. Figure 4As shown, the cone top 5, bearing 6, and pressure cap 8 extend together until the outer cone surface of the cone top 5 and the inner cone surface of the cone sleeve 7 coincide. At this time, the cylinder 4 stops moving and maintains the pre-intake pressure state, thereby making the bearing 6 and the spindle 9 tightly positioned together.

[0030] like Figure 1-2 As shown, this is the working principle of the prior art. The flip seat 11 is pushed and pulled by manually pulling the handle 12. When it is necessary to change the plate, the locking handle 13 is released manually, and then the flip seat 11 is pulled out along the sliding shaft and flipped. After the sleeve is changed, the flip seat 11 is flipped back to the initial position and pushed in. Finally, the locking handle 13 is locked to complete the plate changing operation.

[0031] When the mechanism is running in this invention, the piston in the cylinder 4 drives the cone top 5, bearing 6, and pressure cover 8 to move forward as a whole until the outer cone surface of the cone top 5 and the inner cone surface of the cone sleeve 7 overlap. At this time, the cylinder 4 stops moving and maintains the forward pressure state. At this time, the bearing 6 and the spindle 9 are in a cooperating state.

[0032] The cone tip 5 and the cone sleeve 7 are in a cone surface fit. This type of fit has no radial clearance, is easy to assemble, can withstand large loads, and has high repeatability.

[0033] The bearing 6 is fixed by the pressure cap 8 and the cone top 5, and the three form a whole. This whole is connected to the cylinder 4 by screws. The forward and backward movement of the bearing 6 is achieved by controlling the linear reciprocating motion of the cylinder 4.

[0034] Example 2

[0035] Based on Example 1, the cone top 5 is fixedly connected to the protruding end of the cylinder 4 by bolts; the cone sleeve 7 is fixedly connected to the movable seat 3 by screws.

[0036] Example 3

[0037] This invention relates to an automatic positioning method for printing mandrels, employing an automatic positioning mechanism for printing mandrels, the structure of which is as follows: Figure 3-4As shown, the system includes a wall panel 1, a linear guide rail 2 fixed on the wall panel 1, a movable seat 3 slidably mounted on the linear guide rail 2, a cylinder 4 mounted on the movable seat 3, a conical tip 5 fixedly connected to the extended end of the cylinder 4, a bearing 6 fixedly attached to the end of the conical tip 5 opposite to the extended end of the cylinder 4, a spindle 9 connected to the other end of the bearing 6, and a sleeve 10 fixedly connected to the spindle 9 by tensioning, the spindle 9 being in a cantilever state. The movable seat 3 is provided with a groove 14 that mates with the linear guide rail 2, the movable seat 3 is mounted on the linear guide rail 2 through the groove 14 and slides on the linear guide rail 2. The movable seat 3 is provided with a through hole 15, the cylinder 4 is fixedly connected to the end of the through hole opposite to the spindle 9 by bolts, the extended end of the cylinder 4 coincides with the axis of the through hole 15, and when the extended end of the cylinder 4 extends, it extends into the through hole 15. A tapered sleeve 7 is provided inside the end of the through hole away from the cylinder 4. The tapered top 5 is located inside the tapered sleeve 7 and the tapered top 5 and the tapered sleeve 7 are in tapered surface fit. The bearing 6 is located inside the end of the tapered top 5 away from the cylinder 4 and a pressure cap 8 is provided on the bearing 6 and the tapered top 5. The pressure cap 8, the bearing 6, and the tapered top 5 are fixedly connected as a whole by bolts.

[0038] The automatic positioning method is as follows:

[0039] When the sleeve 10 needs to be replaced, the cylinder 4 retracts the cone top 5, bearing 6, and pressure cap 8 together, separating the bearing 6 from the mandrel 9. Then, the moving seat 3 moves along the linear guide 2, causing the moving seat 3 to move the cylinder 4, cone top 5, bearing 6, cone sleeve 7, and pressure cap 8 away from the insertion and removal position of the sleeve 10, thus making room for the insertion and removal of the sleeve. Next, the operator replaces the sleeve 10. After the replacement is completed, the moving seat 3 is moved back to the initial position along the linear guide 2. Then, the cylinder 4 extends, causing the cone top 5, bearing 6, and pressure cap 8 to extend together until the outer cone surface of the cone top 5 coincides with the inner cone surface of the cone sleeve 7, thereby automatically repositioning the mandrel 9. At this time, the cylinder 4 stops moving and maintains the pre-intake pressure state, thus tightly positioning the bearing 6 and the mandrel 9 together.

[0040] This invention achieves automatic, high-precision, and repeatable positioning of the printing mandrel through the reciprocating motion of the cylinder and the taper positioning between the cone tip and the cone sleeve, thereby improving printing quality and plate changing efficiency.

Claims

1. An automatic positioning mechanism for printing mandrels, characterized in that, Includes a wall panel (1), on which a linear guide rail (2) is fixed, and a movable seat (3) is slidably mounted on the linear guide rail (2). A cylinder (4) is mounted on the movable seat (3), and a conical top (5) is fixedly connected to the extended end of the cylinder (4). A bearing (6) is fixed to one end of the conical top (5) away from the extended end of the cylinder (4). A spindle (9) is connected to the other end of the bearing (6). A sleeve (10) is fixedly connected to the spindle (9) by tensioning. The spindle (9) is in a cantilever state. The movable seat (3) is provided with a sliding groove (14) that cooperates with the linear guide rail (2). The movable seat (3) is installed on the linear guide rail (2) through the sliding groove (14) and slides on the linear guide rail (2). The movable seat (3) is provided with a through hole (15). The cylinder (4) is fixedly connected to the end of the through hole away from the spindle (9) by bolts. The extended end of the cylinder (4) coincides with the axis of the through hole (15). When the extended end of the cylinder (4) extends out, it extends into the through hole (15). A tapered sleeve (7) is provided inside the end of the through hole away from the cylinder (4). The cone top (5) is provided inside the tapered sleeve (7) and the cone top (5) and the tapered sleeve (7) are in tapered surface fit. The bearing (6) is located inside the end of the cone top (5) away from the cylinder (4) and a pressure cap (8) is provided on the bearing (6) and the cone top (5). The pressure cap (8), the bearing (6), and the cone top (5) are fixedly connected as a whole by bolts. When used for automatic positioning of printing mandrels: When the sleeve (10) needs to be replaced, the cylinder (4) drives the cone top (5), bearing (6), and pressure cap (8) to retract together, the bearing (6) and the spindle (9) separate, and then the moving seat (3) moves along the linear guide (2), so that the moving seat (3) drives the cylinder (4), cone top (5), bearing (6), cone sleeve (7), and pressure cap (8) to avoid the insertion and removal position of the sleeve (10), and then the sleeve (10) is replaced. After the replacement is completed, the moving seat (3) is moved back to the initial position along the linear guide (2), and then the cylinder (4) extends, driving the cone top (5), bearing (6), and pressure cap (8) to extend together until the outer cone surface of the cone top (5) and the inner cone surface of the cone sleeve (7) coincide. At this time, the cylinder (4) stops moving and maintains the pre-intake pressure state, so that the bearing (6) and the spindle (9) are tightly positioned together.

2. The automatic positioning mechanism for printing mandrels according to claim 1, characterized in that, The cone top (5) is fixedly connected to the protruding end of the cylinder (4) by bolts.

3. The automatic positioning mechanism for printing mandrels according to claim 2, characterized in that, The cone sleeve (7) and the movable seat (3) are fixedly connected by screws.

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