CN115872213A - Easy-to-replace large-breadth self-flattening guide roller - Google Patents

Abstract

The invention provides an easily-replaceable large-breadth self-flattening guide roller, which comprises a roller core, an outer roller body and an inner roller body; the outer roller body is of a sleeve structure with a hollow inner part, a herringbone thread structure is arranged on the outer surface of the outer roller body along the circumferential direction, and anti-skid materials are uniformly attached to the surface of the herringbone thread structure; the inner roller body is arranged in the inner cavity of the outer roller body and comprises a hollow steel cylinder, a buffer liner, a connecting baffle plate and a plurality of self-adaptive compensation units; each self-adaptation compensation unit comprises a spring and a spring limiting rod, the spring limiting rod is a freely telescopic cylinder, the lower end of the spring limiting rod is fixedly connected with the hollow steel cylinder, the upper end of the spring limiting rod is embedded into a positioning groove of the outer roller body, the spring is sleeved on the spring limiting rod, the lower end of the spring limiting rod is welded with the hollow steel cylinder, and the upper end of the spring limiting rod is abutted against the outer roller body. The large-breadth self-flattening guide roller can solve the problems of printing stock wrinkles, roller pressure incapability of self-adaptive adjustment and roller adaptability caused by roller slipping.

Description

Easy-to-replace large-breadth self-flattening guide roller

Technical Field

The invention belongs to the field of printing equipment, and particularly relates to an easily-replaced large-breadth self-flattening guide roller.

Background

The printing mode mainly comprises flexographic printing, lithographic printing, screen printing, digital printing, gravure printing and the like, wherein the flexographic printing is also called flexography for short, and is a process for printing by using a flexible printing plate and a method of transferring ink through an anilox roller. The flexographic printing has the advantages of high printing speed, lower cost, environmental protection, high production efficiency, easy operation and maintenance and the like, and is widely applied to the fields of corrugated cases, liquid packages, paper cups, paper bags, labels, napkins and the like. The flexographic printing market will continue to expand in size in the future.

The flexographic printing machine mainly comprises an unwinding feeding part, a printing part, a drying part and a rewinding receiving part, wherein the unwinding feeding part and the rewinding receiving part are respectively composed of a plurality of guide rollers and have the function of continuously providing a printing stock with certain tension for the printing part. However, since the guide roller has a smooth surface after a certain period of use and the frictional force between the printing material and the roller is reduced, the printing material slips from both sides to the center due to a slight shock, and wrinkles are generated. Such wrinkles tend to build up gradually as the printing process progresses, becoming larger and larger, ultimately affecting print quality. And the tension of the printing stock can also change along with the gradual thinning of the coil stock, and although the modern printing machine has a tension monitoring and compensating system, the self-adaptive tension adjusting effect cannot be realized. For a complete set of printing systems, different substrates can provide different tensions and the strength of the substrate itself, the friction effect of the substrate with the rollers is different, so that in order to accommodate different substrates, the rollers preferably have exchangeable surfaces. Chinese utility model patent No. 201620155011.1 discloses a printing machine guide roll, and this kind of guide roll covers spiral thread gluing area on the roll body surface to the problem of skidding between roller and the stock has been solved. However, the disadvantage is that the unidirectional thread tends to cause the substrate to slide sideways, and the problems of tension adjustment and roller adaptability are not solved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the large-breadth self-flattening guide roller which is easy to replace; the large-breadth self-flattening guide roller can solve the problems of printing stock wrinkles, roller pressure incapable of self-adaptive adjustment and roller adaptability caused by roller slipping.

The invention is realized by the following technical scheme:

an easily-replaced large-breadth self-flattening guide roller comprises a roller core, an outer roller body and an inner roller body;

the roller core is used for connecting the guide roller and the printing machine and comprises a left end and a right end which are coaxially arranged, and the roller cores at the left end and the right end are provided with multistage steps for mounting bearings;

the outer roller body is of a sleeve structure with a hollow interior, the outer surface of the outer roller body is in contact with a printing stock, a herringbone thread structure is arranged on the outer surface along the circumferential direction, and anti-skid materials are uniformly attached to the surface of the herringbone thread structure;

the inner roller body is arranged in the inner cavity of the outer roller body and comprises a hollow steel cylinder, a buffer liner, a connecting baffle plate and a plurality of self-adaptive compensation units; the hollow steel cylinder, the roller core and the connecting baffle plate are coaxially and fixedly connected together; the buffer gasket is arranged between the outer wall of the hollow steel cylinder and the inner wall of the outer roller body; each self-adaptive compensation unit comprises a spring and a spring limiting rod, the spring limiting rod is a freely telescopic cylinder, the lower end of the spring limiting rod is fixedly connected with the hollow steel cylinder, the upper end of the spring limiting rod is embedded into the positioning groove of the outer roller body, the spring is sleeved on the spring limiting rod, the lower end of the spring limiting rod is welded with the hollow steel cylinder, and the upper end of the spring limiting rod abuts against the outer roller body.

Preferably, the lengths of the left and right roller cores are unequal, and the long ends of the roller cores are provided with key grooves for mounting gears.

Preferably, a plurality of axial through grooves penetrating through the inner wall of the outer roller body in the axial direction are uniformly formed in the inner wall of the outer roller body in the circumferential direction, and a plurality of positioning grooves are formed in the bottoms of the axial through grooves.

Preferably, six self-adaptive compensation units are uniformly distributed in the circumferential direction of the inner roller body, the number of the axial through grooves formed in the outer roller body is six, and each self-adaptive compensation unit corresponds to one axial through groove.

Preferably, the adaptive compensation unit is provided with three rows in the axial direction of the inner roller body, and the positions of the adaptive compensation unit are respectively at the left edge, the right edge and the middle position of the inner roller body.

The surface of the guide roller is provided with a herringbone thread structure, and the structure can provide axial force when the roller rotates, prevent the printing stock from wrinkling towards the middle and realize the self-flattening effect on the printing stock. The self-adaptive compensation unit is arranged between the inner roller body and the outer roller body of the guide roller, so that the automatic compensation of tension change of a printing stock in the printing process can be realized, and simultaneously, the vibration can be absorbed, and the sliding between the printing stock and the roller caused by the vibration is prevented. Meanwhile, the outer roller body of the guide roller can be conveniently replaced, so that the guide roller is suitable for different printing materials.

Drawings

FIG. 1 is an overall structure view of a guide roll;

FIG. 2 is a side sectional view of a guide roll;

FIG. 3 is a front sectional view of a guide roll;

fig. 4 is a block diagram of an adaptive compensation unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-4, the invention provides an easily replaceable large-breadth self-flattening guide roll, which comprises a roll core 1, an outer roll body 2 and an inner roll body 3.

The roller core 1 is used for connecting a guide roller and a printing machine and comprises a left end and a right end which are coaxially arranged, and a multi-stage ladder is arranged on the roller cores at the left end and the right end and used for mounting a bearing. The left end and the right end of the roller core are unequal in length, and the purpose of the arrangement is to provide more lateral matching spaces for installation so as to adapt to different installation environments. The long end of the roller core 1 is provided with a key groove for mounting a gear, and a guide roller after the gear is mounted can be changed from a driven roller to a driving roller, so that winding and unwinding of printing materials are realized.

The outer roller body 2 is of a hollow sleeve structure, a plurality of axial through grooves penetrating through the outer roller body in the axial direction are evenly formed in the inner wall of the sleeve structure along the circumferential direction, and a plurality of positioning grooves 9 are formed in the bottom of each axial through groove. The outer surface of the outer roller body 2 is in contact with a printing stock, a herringbone thread structure is arranged on the outer surface in the circumferential direction, and anti-skid materials (such as PVC) are uniformly attached to the surface of the herringbone thread structure. By the arrangement, the printing stock can be tightly attached to the outer roller body 2, and relative sliding between the printing stock and the outer roller body is prevented. The herringbone thread structure can be obtained through machining of a numerical control machine tool.

The inner roller body 3 is arranged in the inner cavity of the outer roller body 2 and comprises a hollow steel cylinder 4, a buffer liner 5, a connecting baffle plate 8 and a plurality of self-adaptive compensation units.

The buffer gasket 5 is arranged between the outer wall of the hollow steel cylinder 4 and the inner wall of the outer roller body 2 and used for reducing vibration generated by collision of the inner roller body and the outer roller body.

The two connecting baffle plates 8 are arranged, and the hollow steel cylinder 4, the roller core 1 and the connecting baffle plates 8 are coaxially and fixedly connected together by a welding method.

The self-adaptive compensation unit is provided with a plurality of inner roller bodies which are uniformly distributed in the circumferential direction, the number of the self-adaptive compensation unit is the same as that of the axial through grooves arranged on the outer roller body 2, the number of the self-adaptive compensation unit is 6 in the embodiment, and other numerical values can be set. The adaptive compensation unit may also be provided with a plurality of rows in the axial direction of the inner roller body, in this embodiment, 3 rows are provided, and the positions of the rows are respectively at the left edge, the right edge and the middle position of the inner roller body 3.

Every self-adaptation compensation unit all includes spring 6 and spring gag lever post 7, spring gag lever post 7 is the freely flexible cylinder, and its lower extreme links to each other with hollow steel cylinder 4 is fixed, and its upper end imbeds in the positioning groove 9 of outer roll body 2, and spring gag lever post 7's main function prevents that the spring is irregular flexible. The spring 6 is sleeved on the spring limiting rod 7, the lower end of the spring is welded with the hollow steel cylinder 4, and the upper end of the spring is abutted to the axial through groove of the outer roller body 2 to provide supporting force for the outer roller body 2.

The working principle of the easily-replaced large-width self-flattening guide roller is as follows:

before use, the outer roller body 2 of the guide roller is arranged on the inner roller body 3 along the axial through groove on the inner wall, and the self-adaptive compensation unit on the inner roller body 3 is matched with the axial through groove and fastened at a fixed position to form positioning between the inner roller body and the outer roller body; the guide roll is then mounted in place on the flexographic printing press.

During printing, the printing stock passes through the guide roller and contacts with the surface of the outer roller body 2. The surface of the outer roller body 2 is provided with a herringbone thread structure, and the surface of the thread structure is attached with an anti-slip material, so that the printed matter and the surface of the guide roller can be prevented from sliding relatively after the tension is changed. When the guide roller rotates along the rotating direction shown in fig. 1, the printing stock passes through the guide roller and then drives the guide roller to rotate along the same direction, the herringbone thread structure can generate axial force pointing to two sides from the center of the roller when rotating, and the axial force can force the printing stock to be flattened, so that wrinkles formed by rolling up the printing stock from two sides to the middle are prevented, and the self-flattening effect is realized.

When the printing material passes through the guide roller, the spring 6 in the self-adaptive compensation unit is pressed by the tension effect, and the spring 6 can balance the opposite supporting force of the printing material. Along with the production, the tension of the printing stock can be changed, the supporting force of the spring 6 can be changed along with the change of the tension, and the supporting force is balanced with the tension again, so that the self-adaptive compensation of the pressure is realized. In addition, the spring 6 can absorb the vibration generated in the rotating process of the guide roller, and the offset wrinkles of the printing stock caused by the vibration are avoided.

The outer roller body 2 is replaceable in order to adapt to different printing materials. The replacing steps are as follows: one end of the outer roller body 2 is pressed to enable the spring 6 to be separated from the inner wall of the outer roller body, then an isolation baffle plate is inserted between the spring 6 and the inner wall of the outer roller body 2 to separate the spring 6 from the outer roller body 2, the other end of the outer roller body is pressed again, the isolation baffle plate is inserted, and the like, so that the isolation of all the outer roller bodies 2 and the spring 6 is completed, and the inner roller body 3 can be taken out. During installation, the inner roller body 3 is only required to be inserted into the replaced outer roller body, and the replacement is completed after the spring is buckled at a specific position. In addition, the inclination angle of the herringbone threads on the surface of the outer roller body 2 can be changed, the angle can be adjusted according to the axial force applied to the printing stock, and the adjustable range is 5-10 degrees. For a substrate that is both crumple and strong, a thread structure with a larger angle of inclination may be selected to provide a greater axial force to prevent crumpling. For more fragile substrates a smaller inclination angle should be chosen.

It will be apparent to those skilled in the art that the present invention may be modified in numerous ways, and that such modifications do not depart from the scope of the invention. All such modifications as would be obvious to one skilled in the art are intended to be included within the scope of this claims.

Claims (5)

1. An easily-replaced large-breadth self-flattening guide roller is characterized by comprising a roller core (1), an outer roller body (2) and an inner roller body (3);

the roller core (1) is used for connecting the guide roller and the printing machine and comprises a left end and a right end which are coaxially arranged, and the roller cores at the left end and the right end are provided with multistage ladders for mounting bearings;

the outer roller body (2) is of a sleeve structure with a hollow interior, the outer surface of the outer roller body (2) is in contact with a printing stock, a herringbone thread structure is arranged on the outer surface along the circumferential direction, and anti-skid materials are uniformly attached to the surface of the herringbone thread structure;

the inner roller body (3) is arranged in an inner cavity of the outer roller body (2) and comprises a hollow steel cylinder (4), a buffer liner (5), a connecting baffle plate (8) and a plurality of self-adaptive compensation units; the hollow steel cylinder (4), the roller core (1) and the connecting baffle plate (8) are coaxially and fixedly connected together; the buffer gasket (5) is arranged between the outer wall of the hollow steel cylinder (4) and the inner wall of the outer roller body (2); every self-adaptation compensation unit all includes spring (6) and spring gag lever post (7), spring gag lever post (7) are free flexible cylinder, and its lower extreme links to each other with hollow steel cylinder (4) is fixed, and its upper end imbeds in positioning groove (9) of outer roll body (2), spring (6) suit is on spring gag lever post (7), and the lower extreme is in the same place with hollow steel cylinder (4) welding, and the upper end offsets with outer roll body (2).

2. The easy-to-replace large-breadth self-flattening guide roll according to claim 1, characterized in that the roll cores at the left and right ends are unequal in length, and the long ends of the roll cores (1) are provided with keyways for mounting gears.

3. The easily replaceable large-format self-expanding guide roll according to claim 1, characterized in that the inner wall of the outer roll body (2) is uniformly provided with a plurality of axial through grooves extending axially through the outer roll body in the circumferential direction, and the bottom of the axial through grooves is provided with a plurality of positioning grooves (9).

4. The easily replaceable large-breadth self-expanding flat guide roller according to claim 3, wherein the number of the adaptive compensation units is six, the number of the axial through grooves formed on the outer roller body (2) is six, and each adaptive compensation unit corresponds to one axial through groove.

5. The easily replaceable large-format self-expanding guide roll according to claim 4, characterized in that the adaptive compensation units are arranged in three rows in the axial direction of the inner roll body, at the left and right edges and at the middle position of the inner roll body (3).

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