Device for blowing up plastic film bag before rolling

Abstract

The invention provides a plastic film bag rolling front blowing device which comprises a base, a support, a cutting knife and a blowing pipe, a first driving cylinder is rotatably hinged to the lower portion of the base, a second driving cylinder is arranged on the upper portion of the left side of the base, and the support is installed on the right side of the upper portion of the base; the support is rotationally hinged to the base and the driving rod end of the first driving cylinder through the connecting rod mechanism, the first driving cylinder drives the support to rotate on the base through the connecting rod mechanism, the notching knife is fixedly installed at the driving rod end of the second driving cylinder, and the air blowing pipe is fixedly installed at the upper end of the support. Automatic notching of the notching knife is achieved through the second driving cylinder, inserting and retreating of the air blowing pipe are achieved through the first driving cylinder and the connecting rod mechanism, meanwhile, when the air blowing pipe retreats, the traction direction of a film bag is avoided, partial automation of the blowing procedure before the plastic film bag is rolled is achieved, and a foundation is laid for full automation of a film bag production line.

Description

Technical Field

[0001] The invention relates to a manufacturing technology of a plastic film bag, in particular to a pre-rolling inflation device for a plastic film bag. Background Art

[0002] Plastic film bags are widely used in food packaging, profile packaging and other fields. The production process is roughly as follows: dry plastic particles are added to the lower hopper of the film blowing machine. The plastic particles enter the conveying barrel from the lower hopper by their own weight. The external conveying barrel is heated to gradually melt the plastic particles to form molten plastic. After being filtered by the machine head to remove impurities, the plastic particles come out from the die head. After being cooled and inflated by the air ring, the finished film is rolled into a tube by the herringbone plate, traction roller and winding mechanism.

[0003] In the above process, the function of the inflation process is to ensure that the width and shape of the film bag are uniform when it is rolled up, and that there are no wrinkles on the surface of the film bag after it is rolled up. In the prior art, the inflation of the film bag is done by manually making an incision on the upper surface of the film bag during the pulling process of the film bag, and then inserting a trachea, inflating the film bag to expand it, and then removing the trachea to close the incision. The film bag passes through a pair of squeezing rollers, and the gas rushing into it is isolated in front of the squeezing rollers, so that the film bag in front of the squeezing rollers always remains in an inflated state, so that the subsequent rolling can ensure that there are no wrinkles on the surface of the film bag and the edges of the film bag roll are neat.

[0004] Through the description of the inflation process, it can be seen that the existing inflation process still cannot do without manual operation. If the film bag production line is to be fully automated, this process must be further improved. Summary of the invention

[0005] In view of the problems raised by the background technology, the purpose of the present invention is to provide a device for inflating plastic film bags before they are rolled up, so as to solve the problem that manual incision and inflation are still required in the current inflation process.

[0006] To achieve the above object, the present invention adopts the following technical solution: A device for inflating a plastic film bag before rolling it up comprises a base, a support, a slitting knife and a blowing pipe, wherein a first driving cylinder is rotatably hinged at the lower part of the base, and a cylinder body of the first driving cylinder is rotatably hinged to the base; a second driving cylinder is provided at the upper left part of the base, and the axis of the second driving cylinder is vertically inclined; the support is installed on the right side of the upper part of the base, and the support is rotatably hinged to the base and the driving rod end of the first driving cylinder respectively through a connecting rod mechanism, and the first driving cylinder drives the support to rotate on the base through the connecting rod mechanism; the slitting knife is fixedly installed on the driving rod end of the second driving cylinder, and the second driving cylinder drives the slitting knife to move upward to cut the lower surface of the film bag; the second driving cylinder drives the slitting knife to move downward to leave the incision of the film bag; the blowing pipe is fixedly installed on the upper end of the support, the right end of the blowing pipe is connected to an external air source, and the end face of the left end is an inclined surface.

[0007] The described linkage mechanism includes a first connecting rod and a second connecting rod. The lower end of the first connecting rod is rotatably hinged to the driving rod end of the first driving cylinder, the middle part is rotatably hinged to the base, and the upper end is rotatably hinged to the support. The upper end of the second connecting rod is rotatably hinged to the support, and the lower end is rotatably hinged to the base. The first connecting rod is parallel to the second connecting rod, and the first connecting rod is located on the left side of the second connecting rod.

[0008] The described base includes a box body at the bottom, a column provided on the upper part of the box body, and a cross arm provided at the upper end of the column. The first driving cylinder is installed inside the box body and is rotatably hinged to the box body. The middle part of the first connecting rod is rotatably hinged to the cross arm, and the lower end of the second connecting rod is rotatably hinged to the cross arm.

[0009] On both sides of the left end face of the described blowing pipe, auxiliary inclined surfaces are respectively provided, and the two auxiliary inclined surfaces and the left end face form a sharp conical surface.

[0010] On the upper left side of the described support, a support roller is installed. The roller shaft of the support roller is fixedly connected to the support through a roller frame. A positioning groove is provided in the middle of the support roller, and the positioning groove is used to position the working position of the blowing pipe.

[0011] Above the described support roller, a pressing roller is provided, and the roller shaft of the pressing roller is connected to an external structure through a bracket.

[0012] Both the first driving cylinder and the second driving cylinder are air cylinders.

[0013] Advantages of the present invention: The present invention realizes the automatic cutting of the cutting knife through the second driving cylinder, realizes the insertion and withdrawal of the blowing pipe through the first driving cylinder and the linkage mechanism. At the same time, when the blowing pipe withdraws, it avoids the traction direction of the film bag, realizes partial automation of the blowing process before the plastic film bag is wound, and lays a foundation for the full automation of the film bag production line. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure when the blowing pipe leaves the working position; Figure 3 is Figure 1 the right side view of

[0015] Figure 4 is a schematic diagram of the left end face of the blowing pipe.

[0016] In the figure: 1. Base, 2. Support, 3. Cutting knife, 4. Blowing pipe, 5. First driving cylinder, 6. Second driving cylinder, 7. First connecting rod, 8. Second connecting rod, 9. Support roller, 10. Pressing roller, 11. Box body, 12. Column, 13. Cross arm, 42. Auxiliary inclined surface, 91. Positioning groove. Detailed Implementation Modes

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] As Figures 1-4 shown, the present invention provides a plastic film bag pre-winding inflation device, which includes a base 1, a support 2, a cutting knife 3 and a blowing pipe 4. A first driving cylinder 5 is rotatably hinged to the lower part of the base 1, and the cylinder body of the first driving cylinder 5 is rotatably hinged to the base 1; a second driving cylinder 6 is arranged on the upper left of the base 1, and the axis of the second driving cylinder 6 is vertically inclined; the support 2 is installed on the upper right of the base 1, and the support 2 is rotatably hinged to the base 1 and the driving rod end of the first driving cylinder 5 respectively through a link mechanism, and the first driving cylinder 5 drives the support 2 to rotate on the base 1 through the link mechanism; the cutting knife 3 is fixedly installed at the driving rod end of the second driving cylinder 6, and the second driving cylinder 6 drives the cutting knife 3 to move upward to cut the lower surface of the film bag; the second driving cylinder 6 drives the cutting knife 3 to move downward to leave the cut of the film bag; the blowing pipe 4 is fixedly installed at the upper end of the support 2, the right end of the blowing pipe 4 is communicated with an external air source, and the left end surface is an inclined surface.

[0019] The link mechanism includes a first link 7 and a second link 8. The lower end of the first link 7 is rotatably hinged to the driving rod end of the first driving cylinder 5, the middle part is rotatably hinged to the base 1, and the upper end is rotatably hinged to the support 2; the upper end of the second link 8 is rotatably hinged to the support 2, and the lower end is rotatably hinged to the base 1; the first link 7 is parallel to the second link 8, and the first link 7 is located on the left side of the second link 8. The design of this link structure enables the horizontal part of the blowing pipe 4 to always maintain a horizontal lift during the movement process, preventing the left end tip from tilting up to the upper surface of the film bag and avoiding scratching the upper surface.

[0020] The base 1 includes a box body 11 at the bottom, a column 12 arranged on the upper part of the box body 11, and a cross arm 13 arranged at the upper end of the column. The first driving cylinder 5 is installed inside the box body 1 and is rotatably hinged to the box body 1. The middle part of the first link 7 is rotatably hinged to the cross arm 13, and the lower end of the second link 8 is rotatably hinged to the cross arm 13.

[0021] On both sides of the left end surface of the blowing pipe 4, auxiliary inclined surfaces 42 are respectively arranged, and the two auxiliary inclined surfaces 42 and the left end surface form a sharp conical surface.

[0022] A support roller 9 is installed on the upper left of the support 2. The roller shaft of the support roller 9 is fixedly connected to the support 2 through a roller frame; a positioning groove 91 is arranged in the middle of the support roller 9, and the positioning groove 91 is used to position the working position of the blowing pipe 4.

[0023] A pressing roller 10 is arranged above the support roller 9, and the roller shaft of the pressing roller 10 is connected to an external structure through a bracket.

[0024] The first driving cylinder 5 and the second driving cylinder 6 are both pneumatic cylinders.

[0025] The working mechanism of the present invention is as follows: after the film bag is pulled out from the cooling mechanism, it is gathered by the herringbone plate and introduced into the conveying roller, and then enters the inflation station. At this time, the front end of the film bag is reversed, passed between the support roller 9 and the pressure roller 10, and then wound around the traction roller behind the inflation station to start winding; at the inflation station, there is still a gap between the upper and lower surfaces of the film bag; before the winding operation, the device is started; first, the second driving cylinder 6 is started to make the cutting knife 3 rise, and an inflation hole is pierced on the lower surface of the film bag , and then the second driving cylinder 6 is reset; then the first driving cylinder 5 is started, the support 2 rises from the lower right to the top, and the left end face of the blowing tube 4 is inserted into the gap between the upper and lower surfaces from the inflation port on the lower surface of the film bag until the left end of the blowing tube is completely inserted, and then the external air source is started for inflation; after the inflation is completed, the external air source is turned off, the first driving cylinder 5 is reset, and the blowing tube 4 moves to the lower right with the support 2, avoiding the traction direction of the film bag. At this point, the incision and inflation steps in the film bag blowing process are completed.

[0026] The parts not described in detail in this invention are prior art.

Claims

1. A plastic film bag pre-winding inflation device, comprising a base (1), a support (2), a cutting knife (3) and a blowing pipe (4). Characterized in that: A first driving cylinder (5) is rotatably hinged to the lower part of the base (1), and the cylinder body of the first driving cylinder (5) is rotatably hinged to the base (1); a second driving cylinder (6) is provided on the upper left side of the base (1), and the axis of the second driving cylinder (6) is vertically inclined. The support (2) is installed on the upper right side of the base (1), and the support (2) is rotatably hinged to the base (1) and the driving rod end of the first driving cylinder (5) respectively through a link mechanism, and the first driving cylinder (5) drives the support (2) to rotate on the base (1) through the link mechanism. The cutting knife (3) is fixedly installed at the driving rod end of the second driving cylinder (6), and the second driving cylinder (6) drives the cutting knife (3) to move upward to cut the lower surface of the film bag; the second driving cylinder (6) drives the cutting knife (3) to move downward to leave the cut of the film bag. The blowing pipe (4) is fixedly installed at the upper end of the support (2), the right end of the blowing pipe (4) is communicated with an external air source, and the left end face is an inclined plane.

2. A plastic film bag pre-winding inflation device according to claim 1. Characterized in that: The link mechanism includes a first link (7) and a second link (8). The lower end of the first link (7) is rotatably hinged to the driving rod end of the first driving cylinder (5), the middle part is rotatably hinged to the base (1), and the upper end is rotatably hinged to the support (2); the upper end of the second link (8) is rotatably hinged to the support (2), and the lower end is rotatably hinged to the base (1); the first link (7) is parallel to the second link (8), and the first link (7) is located on the left side of the second link (8).

3. A plastic film bag pre-winding inflation device according to claim 2. Characterized in that: The base (1) includes a box body (11) at the bottom, a column (12) provided on the upper part of the box body (11), and a cross arm (13) provided at the upper end of the column (12). The first driving cylinder (5) is installed inside the box body 1 and is rotatably hinged to the box body 1. The middle part of the first link (7) is rotatably hinged to the cross arm (13), and the lower end of the second link (8) is rotatably hinged to the cross arm (13).

4. A plastic film bag pre-winding inflation device according to claim 1. Characterized in that: On both sides of the left end face of the blowing pipe (4), auxiliary inclined planes (42) are respectively provided, and the two auxiliary inclined planes (42) and the left end face form a sharp conical surface.

5. A plastic film bag pre-winding inflation device according to claim 1. Characterized in that: A support roller (9) is installed on the upper left side of the support (2), and the roller shaft of the support roller (9) is fixedly connected to the support (2) through a roller frame; a positioning groove (91) is provided in the middle of the support roller (9), and the positioning groove (91) is used to position the working position of the blowing pipe (4).

6. A plastic film bag pre-winding inflation device according to claim 5. Characterized in that: A pressing roller (10) is provided above the support roller (9), and the roller shaft of the pressing roller (10) is connected to an external structure through a bracket.

7. The pre-winding inflation device for a plastic film bag according to claim 1, characterized in that: the first driving cylinder (5) and the second driving cylinder (6) are both air cylinders.

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