JPH0420389B2 - - Google Patents

Abstract

The cylinder has a shell (2) provided with a rubber coating (1) and a spindle (7) which penetrates said shell with clearance. The shell (2) is mounted rotatably in lateral bearing plates (5) independently of the spindle (7) and the ends of the spindle (7) project from the shell (2) and can be charged by respectively assigned actuators (11) to bring about a bending compensation. A long service life of the rubber coating (1) can be achieved even at high rotational speeds of the shell (2) in that the annular space (12) between the shell (2) and the spindle (7) is incorporated in a cooling circuit which passes over a cooling unit (13). For this purpose, the ends of the spindle (7) are enclosed in each case by a closure cap (14) which is penetrated by the actuator (11), is attached to the adjacent bearing plate (5) and is sealed off against the rotating shell (2) and which is provided with connections (15) for the forward branch (16) or return branch (17) of the coolant circuit. In order to guarantee a sufficient throughput of coolant through the annular space (12), a bypass line (20) is provided in each case in the region of the support bearings (8) arranged between the shell (2) and the spindle (7). <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to cylinders used in machines for processing web-like materials, and more particularly to pressure cylinders for rotogravure printing presses. More particularly, the invention relates to a cylinder whose ends rest on adjustable bearing mounts and whose tubular outer casing is covered with a rubber layer. Non-rotating shafts are arranged within the cylinder in such a way as to create an annular space between them. Furthermore, this cylinder is supported on the shaft by means of a bearing arranged symmetrically with respect to the center of the cylinder casing. The cylinder casing is supported at both ends by self-aligning bearings on bearing mounts. At each end of the casing is an actuator that engages each end of a shaft projecting through the casing. This actuator moves the shaft and also moves the casing via the bearing to suppress its bending.

[Conventional technology]

A cylinder of this kind of design was previously proposed in German Unexamined Specification No. 3033230 with good results, but experience with that cylinder shows that the kneading action exerted on the rubber layer of the cylinder It was found that the temperature was considerably increased, which exceeded the permissible value especially at high speeds, and had an adverse effect on the operating life of the rubber layer. Reducing the contact pressure between this cylinder and the other cylinders of the press, and thus reducing the kneading action, may provide a remedy, but even with electrostatic printing aids, etc. As long as a certain minimum contact pressure between the two cylinders is still required, there will be undesirable effects on the operation of the printing press. Therefore, the known system of the German patent publication had to reduce the rotational speed to below the currently required value of 50,000 rph.

[Problem that the invention seeks to solve]

In view of the above-mentioned prior art, one object of the present invention is to eliminate the deficiencies of previously proposed machines.

Another object of the invention is to provide a device of the kind mentioned at the outset by means of simple and low-cost means, in order to ensure a long operating life of the rubber, despite the fact that the cylinder operates at relatively high speeds. It is about improving.

[Means for solving problems and their effects]

To achieve the above object, the ends of the internal shaft protruding from both ends of the casing are in a terminal cap that is fixed to the adjacent bearing mount and has a sealing member between it and the rotating casing. The actuator operates through a radial bore having at least one sealing ring in each terminal cap. The two terminal caps each have a connection for a feed and a return branch of the coolant circuit. The support bearing between the internal shaft and the casing is
Since each has a shunt duct so that the coolant flows from one side of the bearing to the other, the coolant does not have to be forced through the interior of the bearing.

These means supply the annular space between the casing and the inner shaft with the coolant delivered by the cooling device, despite the provision of force application to the ends of the inner shaft protruding from both ends of the casing. It will be like that. In that case, the coolant is preferably oil. Therefore, when the cooling liquid is supplied, the inside of the casing having a rubber layer on its surface is cooled. The positive effect resulting from this internal cooling is that although the kneading action generates heat in the rubber layer on the cylinder, the heat is removed by conduction, and the temperature of the rubber remains within an acceptable range even at high speeds. This significantly extends the life of the layer and improves the quality of printing. When oil flows through the annular space between the casing and the inner shaft, it simultaneously lubricates and cools the support bearing. the result,
The support bearing can take the form of a plain bearing, which is hydrodynamically lubricated during operation and therefore produces very low levels of friction and has excellent damping properties. Furthermore, since oil is used, overheating points or local overheating of the casing due to bearing friction can be prevented. Each support bearing is provided with a shunt duct, which ensures that the flow rate of the coolant flowing through the annular space between the casing and the inner shaft is independent of the generally very low flow rate through the support bearings. becomes.

Proposals have already been made in which the annular space between the casing and the inner shaft is filled with oil.
(See German Patent No. 3114731.) However, since this oil is in a quiescent state, only a slight heat exchange and prevention of local overheating of the casing is possible. This oil filling method does not allow general cooling of the casing and the rubber layer above it.

As part of a further advantageous development of the invention, holes can be provided in the inner shaft in order to form ducts connecting the components of the annular space on the two sides of each support bearing. This duct is in the form of a particularly simple shunt duct. In this regard, the bore in the internal shaft may be slanted straight or may form an L-shape.

According to a further advantageous development of the invention, the actuator has a separate plunger fitted into the radial bore of the respective terminal cap, so that the plunger engages with the end of the inner shaft. I can do it. The end of the plunger remote from the internal shaft engages a piston rod of a piston-cylinder unit mounted in an adjacent bearing mount. This arrangement has the advantage of simplifying assembly and disassembly, since it is not necessary to remove the plunger, which is separate from the piston rod, from the radial hole in each terminal cap. Also, there is no need to reinsert the plunger into the operating position in the cap after disassembly.

The above-described configuration of the invention therefore produces favorable effects not only with respect to assembly but also with respect to the operational life of the sealing member used with the actuator and disposed on the terminal cap.

BRIEF DESCRIPTION OF THE DRAWINGS Further advantageous effects and convenient developments of the invention can also be understood from the detailed description of the exemplary embodiments given below with reference to the accompanying drawings.

〔Example〕

Since the basic design and operation of rotogravure printing machines are generally known, a description of the main parts of such machines will not be covered here. The press cylinder shown in the drawing consists of a tubular casing 2 covered with a rubber layer 1 and having bearing journals 3 at both ends that reach the sides of the printing press. A hole coaxial with the hollow space within the casing 2 passes through the journal 3. The journal 3 is also rotatably supported in a side bearing mount 5 by a self-aligning bearing 4. The bearing mount 5 is acted upon by a cylinder drive 6, not shown in detail, by which the pressure cylinder is moved into engagement with another cylinder of the printing press or away from it. can. Tubular casing 2
Therein is a non-rotating shaft 7 extending through the casing from one end to the other and having an outer diameter smaller than the inner diameter of the casing 2 and boring into each journal 3. The non-rotating internal shaft 7 is radially connected to the casing 2 by means of a plurality of support bearings 8 arranged symmetrically to and coaxially with respect to the center of the casing 2 . These support bearings 8 are fixed in the axial direction between the collar on the shaft 7 and a retaining ring 9 acting on the bush 10.

Since the internal shaft 7 is longer than the casing 2 with the end journal 3, both ends of the internal shaft 7 protrude from the journal 3 and thus from the ends of the casing 2.
For correcting or restraining the deflection of the cylinder using the internal shaft 7, there is an actuator 11 acting on each end and projecting from the casing 2 in a radial direction relative to the internal shaft 7 and the casing 2. These actuators 11 are attached to adjacent bearing mounts 5 by means of screws shown marked in the figure.

Each time the press cylinder rotates, the rubber of the rubber layer 1 is kneaded, and as a result, a large amount of heat is generated. Nevertheless, in order to suppress the surface temperature and core temperature of the rubber layer 1 within the rated values, the casing 2 and the internal shaft 7
Coolant, more specifically oil, is supplied to the annular space 12 between the two via a coolant circuit connected to a cooling device 13. The cooling oil, which has flowed into the annular space 12 so as to fill it, circulates actively through the space, and its flow ensures reliable heat transfer and almost perfect temperature uniformity along the entire length of the press cylinder. arise. In order to connect with the annular space 12,
The coolant circuit includes terminal caps 14 arranged around both ends of the internal shaft 7. These terminal caps 14 have connection holes 15 for the feed branch 16 and the return branch 17 of the coolant circuit containing the cooling device 13. The terminal caps 14 are screwed onto adjacent bearing mounting bases 5, respectively. In order to fix the internal shaft 7 in the axial direction, the terminal cap 1 is
4 can be provided with internal contacts 18.
In order to seal off the self-aligning bearing 4 from the space inside the terminal cap 14, a shaft seal or packing 19 is provided.
It is provided between the side of the terminal cap 14 adjacent to and facing the bearing journal 3 and the bearing journal 3.

To ensure that the support bearing 8 does not block the flow of oil along the inner shaft 7, there is a shunt or bypass duct 20 leading from one side of the bearing 8 to the other. In the illustrated embodiment, the inner shaft 7 is bored with an angled or L-shaped bore opening at both ends into the annular space 12 at points upstream and downstream of the bearing 8. Instead of the angled hole 20, it is also possible to provide an inclined straight hole extending through the shaft 7 from one side to the other, as shown in broken lines in the figure.

The pipe lines forming the feed branch 16 and the return branch 17 can be rigid or flexible pipes. The line forming the return branch 17 opens towards a tank 21 with a suction duct for a feed pump 22 for the cooling system. pump 22
For example, a flow rate or liquid level support meter 23 such as a water level gauge or a peephole is provided. It is also possible to devise the indicator 23 so that the pressure cylinder cannot be operated after a pump failure or that the pressure cylinder cannot move into engagement with another cylinder of the printing press. In order to maintain stable operating conditions, the oil temperature in the feed branch path 16 is automatically controlled to maintain the adjusted value. To enable this automatic control,
The oil temperature is detected in the feed branch 16 by a sensor 24 and the reading is applied to the set point adjustment knob 25.
to an automatic controller 26 having a This automatic controller makes it possible to control the flow rate of cooling oil or cooling water flowing through the cooling device 13, ie, the heat exchanger. For this control, the cooling water line 27 from the cooling device 13 is provided with a valve 28 which is driven by a controller 26 .

Each terminal cap 14 has a radial hole 29 in its cylindrical wall, and the plunger portion of each actuator 11 fits into the hole and engages the end of the shaft 7. In order to ensure a reliable sealing effect, the radial bore 29 is fitted with one or more sealing rings 30. However, as a general configuration, each actuator 11 is in the form of a piston-cylinder unit.
The piston rod itself has terminal cap 1.
It is fitted into the radial hole 29 of No. 4. However, in such a configuration, the piston rod 31 and the radial hole 2 can be removed by disassembling the terminal cap 14.
9 has to be uncoupled, the piston rod has to be reintroduced into the radial bore 29 during reassembly, which often damages the sealing ring 30. Therefore, in this embodiment, the actuator 11 is composed of a plunger 32 fitted into the radial holes 29 of the two terminal caps 14, and a piston/cylinder unit 34 for driving the plunger. Each unit 3
The piston rod 31 of No. 4 reaches the radially outer end of the adjacent terminal cap 14 and is driven in cooperation with a plunger 32 fitted in the radial hole 29. The radially inner end of plunger 32 engages the end of internal shaft 7 . The plunger 32, which is provided separately from the unit 34, can remain in contact with the shaft 7 within the terminal cap 14 at that time and in the radial hole 29 during disassembly. The plunger 32 is provided with a convex inner end that contacts a flat surface 33 at the end of the inner shaft 7.

In the illustrated embodiment of the invention, the support bearing 8 is in the form of a rolling bearing, since the annular space 12 bridged by the support bearing 8 is supplied with cooling oil. It is also possible to design it as a plain bearing. During operation, this plain bearing is lubricated in a hydrodynamic manner, so
It will ensure that only very low levels of friction occur and will also provide excellent vibration damping effects.

〔Effect of the invention〕

The present invention has the above-mentioned configuration, and since the entire cylinder is sufficiently cooled, the temperature of the rubber layer 1 does not rise beyond the permissible range even during high-speed rotation, and the operating life is therefore significantly extended. In addition, it has excellent effects such as simple structure and low cost.

[Brief explanation of drawings]

The figure is a partially omitted longitudinal cross-sectional view of a press cylinder of a rotogravure printing press according to the present invention. DESCRIPTION OF SYMBOLS 1... Rubber layer, 2... Casing, 4... Self-aligning bearing, 5... Bearing mounting base, 7... Internal shaft, 8
... Support bearing, 11 ... Actuator, 12
... Annular space, 13 ... Cooling device, 14 ... Terminal cap, 16 ... Feeding branch path, 17 ... Return branch path, 19 ... Shaft seal (packing), 20 ...
Branch (bypass) duct, 21...Tank, 22
... Feed pump, 24 ... Sensor, 26 ... Automatic controller, 29 ... Radial hole, 30 ... Seal ring, 32 ... Plunger, 33 ... Plane part, 34 ... Piston/cylinder unit.

Claims (1)

[Claims] 1. A cylindrical casing having an axis, and an adjustable casing for receiving and supporting both ends of the cylindrical casing and engaging the casing with at least one portion of the machine parallel to the axis. A bearing mounting base,
an internal shaft within the cylindrical casing,
having an outer diameter smaller than the diameter of the hole so as to create an annular space between the hole in the casing and the shaft along its length, and support bearing means for supporting the casing on the shaft. , having at least one bearing spaced apart from the ends of the casing and arranged symmetrically with respect to the midpoint between the ends of the casing; and an automatic motor supporting both ends of the casing on the bearing mounts. an aligning bearing and at each end of said shaft at least a portion of the shaft between said ends via said bearing means for reducing deflection of the casing by moving said shaft radially relative to the end of said casing; an actuator acting on the casing at two positions; a terminal cap at each end of the shaft protruding from the end of the casing and mounted on the bearing mount; a relative rotational movement between the cap and the casing; at least one sealing ring within the radial bore of each cap sealing said actuator within said cap; and a cooling fluid circuit connected to said terminal cap. a cooling device having cooling fluid directed into one terminal cap and then along an annular space between said casing and said shaft to the other terminal cap, and from said terminal cap to said cooling device; said actuator extends through a radial hole in said terminal cap, and said at least one support bearing is adapted to allow cooling fluid to flow therethrough. A cylinder for a machine for processing web-like material, characterized in that it has shunt duct means for passage from one side of the support bearing to the other. 2. said shunt duct means comprising a duct part in the form of a bore bored with two ends opening into said annular space adjacent to two sides of said at least one support bearing; A cylinder according to claim 1. 3. A shaft seal as set forth in claim 1, having a shaft seal located between both ends of the casing and each adjacent terminal cap to allow relative rotational movement between the casing and the cap. cylinder. 4. The actuator consists of a plunger fitted into a radial hole of an adjacent terminal cap, and a piston/cylinder unit that engages the radially outer end of the plunger, and the radially inner end of the plunger is connected to the shaft. A cylinder as claimed in claim 3 engaging the ends. 5. Claim 4, wherein said plunger has a convex radially inner end that engages said shaft.
Cylinders listed in section. 6. The cylinder according to claim 5, wherein the shaft has flat portions at both ends that engage with the actuator. 7. The cylinder according to claim 1, wherein the cooling device includes a heat exchanger and an automatic controller that keeps the temperature of the coolant constant. 8. The cooling device comprises a tank for cooling liquid, a duct for returning the cooling liquid flowing out of the annular space into the tank, and a pump for moving the cooling liquid from the tank in order to cool the cooling liquid. A cylinder according to claim 1. 9. A cylinder according to claim 8, wherein the pump has means for monitoring its operating condition. 10. The cylinder of claim 1, wherein the annular space between the casing and the inner shaft is filled with cooled oil. 11. The cylinder according to claim 1, which is designed in the form of a rotogravure pressing cylinder.