CN217751719U - Plastic film side cut blade mounting structure - Google Patents

Abstract

A mounting structure of a plastic film edge cutting blade comprises a rack, a cutter seat and a cutter blade, wherein a transverse linear slide rail is fixedly arranged on the rack, the cross section of the transverse linear slide rail is circular, and the lower part of the cutter seat can swing back and forth around the central axis of the transverse linear slide rail; a motor is fixedly arranged on the frame, and a rotating shaft of the motor is connected with an eccentric wheel; the side surface of the circumference of the eccentric wheel is arc-shaped on the section passing through the central axis of the motor rotating shaft; the central axis of the motor rotating shaft is positioned at the eccentric position of the circular eccentric wheel; the cutter holder is connected with a left transverse clamping block and a right transverse clamping block through a transmission component, and the circular eccentric wheel is clamped between the left transverse clamping block and the right transverse clamping block; the cutter seat is connected with a front straight clamping block and a rear straight clamping block through a transmission component, and the circular eccentric wheel is clamped between the front straight clamping block and the rear straight clamping block. The utility model discloses can rely on a motor drive cutting blade to carry out the swing of two directions simultaneously.

Description

Plastic film side cut blade mounting structure

Technical Field

The utility model belongs to the technical field of plastic film production facility, concretely relates to mounting structure of plastic film side cut blade.

Background

The film blowing plastic film is generally produced by adopting an extrusion process, the left and right side edges of the plastic film which is just extruded can irregularly shrink towards the center, so that the thickness of the two side edges of the film is thicker, the thickness fluctuation is large, the product requirements are not met, the edge cutting is usually required, and the film roll which is compact is formed by rolling after the edge cutting. The edge line after edge cutting is rougher than other parts, and has fuzz in a microscopic view, so that the rolled film roll is easy to be slightly fluffy at the edge part. Therefore, in the conventional technology, the film roll formed by winding the cut edge of the film is uniform and neat in the transverse position of the edge, so that the fluffy problem is gradually accumulated along with the increase of the winding layer number of the film roll 9 until the problem similar to the rib bursting occurs at the edge part of the film roll 9 (such as the part shown in AB \ CD in fig. 1). Of course, the severity of the edge bead burst problem varies with the material of the film roll, the thickness of the plastic film, the winding tension, the number of winding layers of the film roll, and other factors.

On the other hand, in the conventional technology, when the plastic film is trimmed, the plastic film moves from an upstream guide roller (i.e. the guide roller located upstream of the cutter) to a downstream guide roller (i.e. the guide roller located downstream of the cutter), the upstream guide roller and the downstream guide roller tension the film, the cutter blade is fixed and suspended above the tensioned film, and the position of the cutter blade is fixed due to the fixed moving track of the film, so that although the edge of the cutter blade is a line segment, only one point of the edge is continuously in a cutting state, and most other parts of the edge are in an idle state, therefore, most of the length of the edge is wasted, and the real point of the edge is continuously in a cutting and heating state and is easily worn, thereby greatly shortening the service life of the expensive blade, and in addition, frequent replacement of the blade also takes a considerable working time.

In order to solve the two problems, the applicant successively designs two sets of eccentric cam mechanisms, wherein each set of eccentric cam mechanism is respectively used for solving one of the problems, and applies patents with patent numbers of ZL 2011193568.5 and ZL201521045962.5 to the national intellectual property office. Where ZL201721193568.5 is capable of reciprocating the cutter transversely and ZL201521045962.5 is capable of reciprocating the cutter straight ("straight" means perpendicular to transverse direction). However, the two sets of eccentric cam mechanisms are independent from each other, so in order to solve the two problems, two sets of eccentric cam mechanisms must be added at the same time and are driven by two motors respectively, which obviously has complex structure and high cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned shortcoming and providing a mounting structure of plastic film side cut blade, it can rely on a motor drive cutting blade to carry out the swing of two directions simultaneously.

The purpose can be realized according to the following scheme: a mounting structure of a plastic film trimming blade comprises a rack, a cutter seat and a cutting blade, wherein the cutting blade is fixedly mounted at the lower part of the cutter seat; the cutting device is characterized in that the cross section of the transverse linear slide rail is circular, the upper part of the cutter holder is sleeved outside the circular transverse linear slide rail, and the lower part of the cutter holder can swing back and forth around the central axis of the transverse linear slide rail; a motor is also fixedly arranged on the rack, the extension direction of a rotating shaft of the motor is the vertical direction, the position of the rotating shaft of the motor is fixed relative to the rack, and the rotating shaft of the motor is connected with an eccentric wheel; the circumferential side surface of the eccentric wheel is arc-shaped on the section passing through the central axis of the motor rotating shaft, and the whole eccentric wheel is in a drum shape with two small ends and a large middle part; the central axis of the motor rotating shaft is positioned at the eccentric position of the circular eccentric wheel; the cutter holder is connected with a left transverse clamping block and a right transverse clamping block through a transmission component, and the circular eccentric wheel is clamped between the left transverse clamping block and the right transverse clamping block; in the process that the circular eccentric wheel rotates around the rotating shaft of the motor, the circumferential side surface of the circular eccentric wheel contacts with the left transverse clamping block and the right transverse clamping block; the cutter holder is connected with a front straight clamping block and a rear straight clamping block through a transmission component, the circular eccentric wheel is clamped between the front straight clamping block and the rear straight clamping block, and the straight distance between the two straight clamping blocks can just accommodate the circular eccentric wheel.

Preferably, the transverse relative position between the left transverse clamping block and the right transverse clamping block and the transmission member can be adjusted and changed, and a locking mechanism for locking the transverse relative position of the left transverse clamping block and the right transverse clamping block after adjustment is further arranged.

The straight direction means a direction perpendicular to the lateral direction. The straight direction can be a longitudinal direction, a vertical direction or a combined direction of the longitudinal direction and the vertical direction.

More preferably, the straight clamping blocks refer to longitudinal clamping blocks, and the straight direction refers to the longitudinal direction.

The utility model has the advantages of it is following and effect:

1. the utility model discloses during operation, circular eccentric wheel is rotated by motor shaft drive, because motor shaft is located the eccentric position of circular eccentric wheel, and the distance between two orthotropic clamp blocks just can hold circular eccentric wheel, therefore the orthotropic position of two orthotropic clamp blocks constantly changes back and forth, two orthotropic clamp blocks drive the lower part of cutter seat through the drive component constantly along the orthotropic swing, the cutter piece directly moves thereupon, thereby constantly change the tangential point position of cutting edge, avoid the cutting edge to be in cutting state only a bit continuously and other positions to be in idle state continuously, make the blade prolong life, avoid frequently changing the blade, improved work efficiency; on the other hand, in the process that the circular eccentric wheel rotates around the rotating shaft of the motor, the circumferential side surface of the circular eccentric wheel is contacted with the left transverse clamping block and the right transverse clamping block, so that the circular eccentric wheel can drive the transverse positions of the two transverse clamping blocks to change back and forth continuously, the two transverse clamping blocks drive the lower part of the cutter seat to reciprocate back and forth continuously through the transmission component, and drive the cutter blade to reciprocate back and forth continuously and back and forth periodically, so that the transverse position of the cutter is changed continuously, the edges (thicker points/rough points) of the film are dispersed in the transverse direction, and the film edges cannot be accumulated in the same transverse position in a centralized mode, the accumulated thickness of the thicker points of the edges of the film is greatly weakened, the rib explosion phenomenon caused by the concentration of the thicker points of the edges of the film is basically eliminated, and the winding quality is improved.

2. The transverse relative position between the left transverse clamping block and the right transverse clamping block and the transmission component can be adjusted and changed, so that the amplitude of the periodic reciprocating transverse motion of the cutting blade can be adjusted, namely the dispersion degree of the thicker points of the edge of the film is adjusted, and the requirements of the change of factors such as the material of the film roll, the thickness of the plastic film, the winding tension, the number of winding layers of the film roll and the like are met.

3. The utility model can realize the reciprocating motion in two directions (horizontal and vertical) only by one motor and one circular eccentric wheel, and has simple and smart structure; the circumferential side surface of the eccentric wheel is arc-shaped on the section parallel to the axial direction of the motor rotating shaft, and the twisting between the eccentric wheel and the longitudinal clamping block can be adapted.

Drawings

FIG. 1 is a schematic view showing the state in which the left and right edges of a roll of plastic film are easily warped or cracked.

Fig. 2 is a schematic diagram of a side view structure and a use state according to an embodiment of the present invention.

Fig. 3 is a schematic front view of an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view E-E of FIG. 3.

Fig. 5 is a partially enlarged schematic view of the eccentric wheel of the structure shown in fig. 3.

Fig. 6 is a schematic view of the shape of the eccentric in fig. 5.

Fig. 7 is a schematic sectional view taken along line F-F in fig. 5.

Fig. 8 is a schematic diagram of a change state after the eccentric in fig. 4 is rotated by 90 ° counterclockwise.

Fig. 9 is a schematic diagram of a change state after the eccentric in fig. 4 is rotated by 180 ° counterclockwise.

Fig. 10 is a schematic diagram of a change state after the eccentric wheel in fig. 4 is rotated counterclockwise by 270 °.

Fig. 11 is a schematic diagram of a change state after the eccentric of fig. 7 is rotated by 90 ° counterclockwise.

Fig. 12 is a schematic diagram of a change state after the eccentric in fig. 7 is rotated by 180 ° counterclockwise.

Fig. 13 is a schematic diagram of a change state after the eccentric in fig. 7 is rotated counterclockwise by 270 °.

FIG. 14 is a schematic view of the overall drum profile of the eccentric of FIG. 6.

Detailed Description

The mounting structure of the plastic film trimming blade shown in fig. 2, 3, 4 and 5 comprises a frame, a cutter holder 1 and a cutter blade 2, wherein the cutter blade 2 is fixedly mounted at the lower part of the cutter holder 1 and moves along with the cutter holder 1, a transverse linear slide rail 3 is also fixedly arranged on the frame, and the cutter holder 1 is transversely slidably mounted on the transverse linear slide rail 3; the section of the transverse linear sliding rail 3 is circular, and the upper part of the cutter holder 1 is sleeved outside the circular transverse linear sliding rail, so that the lower part of the cutter holder 1 can swing back and forth around the central axis of the transverse linear sliding rail 3; the frame is also fixedly provided with a motor 4, the extending direction of a rotating shaft 40 of the motor is the up-down direction, the position of the rotating shaft 40 of the motor is fixed relative to the frame, and the rotating shaft 40 of the motor is connected with an eccentric wheel 5; the eccentric wheel 5 is circular in cross section perpendicular to the axial direction of the motor rotating shaft 40, as shown in fig. 7; the circumferential side surface of the eccentric wheel 5 is arc-shaped on the section passing through the central axis of the rotating shaft of the motor (as shown in KHG arc line/QMN arc line of figure 6), and the whole eccentric wheel 5 is in a drum shape with two small ends and a large middle part, as shown in figures 4, 5, 6 and 14; the central axis of the motor rotating shaft 40 is positioned at the eccentric position of the circular eccentric wheel 5; the cutter seat 1 is connected with a front longitudinal clamping block 6 and a rear longitudinal clamping block 6 through a transmission component 10, a circular eccentric wheel 5 is clamped between the front longitudinal clamping block 6 and the rear longitudinal clamping block 6, and the longitudinal distance between the two longitudinal clamping blocks 6 can just accommodate the circular eccentric wheel 5; the cutter holder 1 is also connected with a left transverse clamping block and a right transverse clamping block 7 through a transmission component 10, and a circular eccentric wheel is clamped between the left transverse clamping block and the right transverse clamping block 7; during the rotation of the circular eccentric wheel 5 around the motor rotating shaft 40, the circumferential side surface of the circular eccentric wheel 5 contacts with the left transverse clamping block 7 and the right transverse clamping block 7.

As shown in fig. 7 and 11, the transverse relative position between the left transverse clamping block 7 and the right transverse clamping block 7 and the transmission component 10 can be adjusted and changed; the cutter is also provided with a locking bolt 71 used for locking the transverse relative position of the left transverse clamping block and the right transverse clamping block after adjustment, and the left transverse clamping block 7, the right transverse clamping block 7 and the transmission component 10 are fixed by the bolt 71 after adjustment in the working process of the cutter.

The working principle of the above embodiment is as follows: in the working process, the plastic film 8 runs through the cutter blade 2, the motor 4 drives the circular eccentric wheel 5 to rotate around the central axis of the motor rotating shaft 40, the transverse positions of the left transverse clamping block 7 and the right transverse clamping block 7 are continuously changed in a reciprocating mode, the longitudinal positions of the front longitudinal clamping block 6 and the rear longitudinal clamping block 6 are continuously changed in a reciprocating mode, the left transverse clamping block 7 and the right transverse clamping block 7 drive the cutter holder 1 to synchronously move transversely through the transmission component 10, the front longitudinal clamping block 6 and the rear longitudinal clamping block 6 drive the cutter holder 1 to synchronously swing longitudinally through the transmission component 10, then the cutter blade 2 synchronously moves transversely along with the left transverse clamping block 7 and the right transverse clamping block 7, and the cutter blade 2 synchronously swings longitudinally along with the front longitudinal clamping block 6 and the rear longitudinal clamping block 6.

For example, in the states shown in fig. 4, 5, and 7, the horizontal positions of the two horizontal clamping blocks 7 on the left and right are located in the middle of the reciprocating horizontal movement track (with the motor rotating shaft 40 as a reference), and the longitudinal positions of the two longitudinal clamping blocks 6 on the front and back are located at the front end of the reciprocating longitudinal movement track (with the motor rotating shaft 40 as a reference); after the circular eccentric wheel 5 rotates by 90 ° around the central axis of the motor rotating shaft 40 in the counterclockwise direction in fig. 7, the transverse positions of the two left and right transverse clamping blocks 7 are at the right end of the reciprocating transverse movement track, and the longitudinal positions of the two front and rear longitudinal clamping blocks 6 are in the middle of the reciprocating longitudinal movement track, as shown in fig. 8 and 11;

after the circular eccentric wheel 5 rotates 180 ° around the central axis of the motor rotating shaft 40 in the counterclockwise direction in the drawing plane of fig. 7, the transverse positions of the left and right transverse clamping blocks 7 are in the middle of the reciprocating transverse movement track, and the longitudinal positions of the front and rear longitudinal clamping blocks 6 are at the rear end of the reciprocating longitudinal movement track, as shown in fig. 9 and 12;

after the circular eccentric wheel 5 rotates 270 ° around the central axis of the motor rotating shaft 40 in the counterclockwise direction in the drawing of fig. 7, the transverse positions of the two left and right transverse clamping blocks 7 are at the left end of the reciprocating transverse movement track, and the longitudinal positions of the two front and rear longitudinal clamping blocks 6 are in the middle of the reciprocating longitudinal movement track, as shown in fig. 10 and 13.

Claims (3)

1. A mounting structure of a plastic film trimming blade comprises a rack, a cutter seat and a cutting blade, wherein the cutting blade is fixedly mounted at the lower part of the cutter seat; the cross section of the transverse linear slide rail is circular, the upper part of the cutter seat is sleeved outside the circular transverse linear slide rail, and the lower part of the cutter seat can swing back and forth around the central axis of the transverse linear slide rail; a motor is also fixedly arranged on the rack, the extension direction of a rotating shaft of the motor is the vertical direction, the position of the rotating shaft of the motor is fixed relative to the rack, and the rotating shaft of the motor is connected with an eccentric wheel; the eccentric wheel is circular on the section vertical to the axial line direction of the motor rotating shaft, the circumferential side surface of the eccentric wheel is arc-shaped on the section passing through the central axial line of the motor rotating shaft, and the whole eccentric wheel is in a drum shape with two small ends and a large middle part; the central axis of the motor rotating shaft is positioned at the eccentric position of the circular eccentric wheel; the cutter seat is connected with a left transverse clamping block and a right transverse clamping block through a transmission component, and the circular eccentric wheel is clamped between the left transverse clamping block and the right transverse clamping block; in the process that the circular eccentric wheel rotates around the rotating shaft of the motor, the circumferential side surface of the circular eccentric wheel contacts with the left transverse clamping block and the right transverse clamping block; the cutter seat is connected with a front straight clamping block and a rear straight clamping block through a transmission component, the circular eccentric wheel is clamped between the front straight clamping block and the rear straight clamping block, and the straight distance between the two straight clamping blocks can just contain the circular eccentric wheel.

2. The structure for mounting a plastic film trimming blade according to claim 1, wherein the lateral relative positions of the left and right lateral clamping blocks and the driving member are adjustable, and a locking mechanism for locking the lateral relative positions of the left and right lateral clamping blocks and the driving member after adjustment is further provided.

3. The mounting structure of plastic film trimming blades as claimed in claim 1, wherein the straight clamping blocks are longitudinal clamping blocks and the straight direction is the longitudinal direction.

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