Bag opening device, automatic bagging machine and bagging method

Abstract

The present invention discloses a bag opening device, an automatic bagging machine and a bagging method, wherein the bag opening device comprises a bag opener, several groups of support units, the support units comprise inner rollers and outer rollers, the bag opener is rotatably mounted with several pairs of inner rollers, the frame is rotatably mounted with outer rollers, each outer roller is correspondingly embedded in a groove between a pair of inner rollers to support the bag opener and prevent the bag opener from moving up and down, a roll film is sleeved on the outside of the bag opener from top to bottom, and the roll film is clamped between the inner roller and the corresponding outer roller. The bag opening device of the present invention ensures that the bag opener cannot move up and down or shake greatly by clamping the roll film between the inner roller and the corresponding outer roller, the bag opener cannot rotate, the pull-down trajectory of the roll film through the bag opener is stable, the bag opening success rate is greatly improved, and the reliability of the bagging machine is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of packaging machinery and equipment, and in particular to a bag opening device, an automatic bagging machine and a bagging method. Background Art

[0002] Bagging machine, also known as bagging packaging machine, is a packaging equipment that wraps products with polyethylene film. After wrapping, the packaging can be completed directly without heating and shrinking; it can also be heated to shrink the film before wrapping the product. According to the machine type, it can be divided into automatic bagging machine, fully automatic bagging machine, manual bagging machine, etc.

[0003] During the operation of the bagging machine, the bag opening step of the roll film is a very important and critical link. The existing roll film bag opening is usually carried out by using a suction cup bag opening device. This type of bag opening device has a poor bag opening effect and low efficiency for thin roll films. The invention of application number 201510741287.8 discloses a bag opening device, including a frame, a lower conveyor roller assembly, a driving member and a floating core ball. The lower conveyor roller assembly includes a first lower conveyor roller, a second lower conveyor roller and a lower conveyor roller mounting plate. The lower conveyor roller mounting plate is fixed to the frame, and the first lower conveyor roller and the second lower conveyor roller are mounted on the lower conveyor roller mounting plate, and the first lower conveyor roller and the second lower conveyor roller support the floating core ball. The floating core ball is connected to a connecting rod, and a contoured tool is connected to the end of the connecting rod away from the floating core ball. The driving member drives the first lower conveyor roller and the second lower conveyor roller to rotate. The bag opening device of the invention will not have the abnormal situation that the bag opening fails because the film thickness of the roll film is relatively thin and the electrostatic adsorption and adhesion of the roll film are very strong. However, the bag opening device has a problem that the floating core ball has a high degree of rotational freedom, and the tube film sometimes rotates along with the floating core ball, resulting in poor bagging. Summary of the invention

[0004] The object of the present invention is to provide a bag opening device, an automatic bagging machine and a bagging method with more stable bagging and higher success rate.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] A bag opening device, characterized in that it includes a bag opener and several groups of support units, wherein the support units include inner rollers and outer rollers, wherein several pairs of inner rollers are rotatably mounted on the bag opener, and outer rollers are rotatably mounted on a frame, wherein each outer roller is correspondingly embedded in a groove between a pair of inner rollers to support the bag opener and prevent the bag opener from moving up and down, and wherein a roll film is sleeved on the outside of the bag opener from top to bottom, and the roll film is clamped between the inner rollers and the corresponding outer rollers. The bag opening device of the present invention ensures that the bag opener cannot move up and down or shake greatly, the bag opener cannot rotate, the pull-down trajectory of the roll film through the bag opener is stable, the bag opening success rate is greatly improved, and the reliability of the bagging machine is greatly improved.

[0007] Furthermore, as a preferred embodiment, a detachable expander is fixed to the lower end of the bag opener. With this structure and two-stage design, the upper bag opener is applicable to a wide range of sizes. The lower expander can be quickly replaced to meet the bagging requirements of rolls with different diameters.

[0008] The present invention also provides an automatic bagging machine. The automatic bagging machine includes a frame, a conveying device for conveying a roll, a bagging device for opening the opening of the roll film, a bagging device for putting the roll film on the roll, and a bag cutting device for cutting the roll film, wherein the bagging device, the bagging device and the bag cutting device are fixed on the frame, and the conveying device is provided with a positioning fixture that moves with the conveyor, and the bag opening device is as described above.

[0009] Furthermore, as a preferred embodiment, it further comprises an upper closing device for inserting the roll film into the upper end of the roll, and the upper closing device comprises a negative pressure device connected to the positioning fixture. When the roll film above the roll is separated by the bag cutting device, the air in the positioning fixture is extracted by the negative pressure device, and the roll film above the roll is sucked into the roll, and the negative pressure device adopts a negative pressure pump.

[0010] Further, as a preference, the upper closing device further comprises a limiting mechanism for pressing the roll film onto the roll, the limiting mechanism comprising a pressing stop portion for pressing the roll film onto the roll and a pressing stop driving portion for driving the pressing stop portion to move. The purpose of the limiting mechanism is to prevent the roll film sleeved on the roll from moving upward relative to the roll when the roll film above the roll is sucked into the roll.

[0011] Furthermore, as a preferred embodiment, it also includes a lower closing device for inserting the roll film into the lower end of the roll, and the lower closing device includes a mechanical claw for lifting the roll and a mechanical claw driving part for driving the mechanical claw to move up and down, and the mechanical claw driving part adopts a cylinder. After the lower closing device lifts the roll through the mechanical claw, the roll moves to the top of the positioning fixture, and the lower closing device generates negative pressure through the negative pressure device. The air in the area below the roll quickly enters the positioning fixture, and the roll film below the roll is arranged by the airflow into a shape of large at the top and small at the bottom, and the lower end of the roll film is sucked into the inner hole of the positioning fixture, and then the mechanical claw drives the roll to move downward, so that the lower end of the roll sleeve is inserted into the positioning fixture. In this process, the above-mentioned roll film part with a large upper and small lower shape is pushed into the lower end of the roll sleeve.

[0012] Further, as a preference, the bag cutting device comprises an electric heating knife and a bag cutting driving mechanism for driving the electric heating knife to rotate, so that the roll film on the roll is cut by the high-temperature electric heating knife rotating.

[0013] Further, as a preference, the bagging device includes a plurality of clamping units, a lifting structure for driving the clamping units to move up and down, and a horizontal motion structure for driving the clamping units to move horizontally, and the clamping units include an inner clamping plate, an outer clamping plate, and a clamping plate driving module for driving the inner clamping plate and the outer clamping plate to move relative to each other.

[0014] Furthermore, as a preference, the up and down movement of the bagging device is driven by a servo motor, which allows the bagging device to accurately control the up and down movement position according to the bag length and switch specifications with one click; the conveying device is driven by a servo motor, and the reel is accurately positioned on the positioning fixture of the conveying device without damaging the silk thread of the reel.

[0015] The present invention also provides a bagging method of an automatic bagging machine, which is characterized by comprising the following steps:

[0016] (1) Step S1, the roll film is sleeved on the outside of the bag opener from top to bottom, and an outer roller is rotatably mounted on the frame, and each outer roller is correspondingly embedded in a groove between a pair of inner rollers to support the bag opener and prevent the bag opener from moving up and down;

[0017] (2) Step S2, moving the roll to be bagged to the position directly below the bag opener;

[0018] (3) Step S3, pulling the roll film downward and sleeve the roll film on the roll;

[0019] (4) Step S4, pressing the roll film onto the roll;

[0020] (5) Step S5, cutting the roll film above the roll;

[0021] (6) Step S6: Under the action of negative pressure, air quickly enters the roll through the upper end of the roll, bringing the upper end of the roll film sleeved on the roll into the roll;

[0022] (7) Step S7, the roll is lifted up, and under the action of negative pressure, air quickly enters the positioning jig through the upper end of the positioning jig, and the lower end of the roll film sleeved on the roll is arranged into a shape of larger at the top and smaller at the bottom. The lower end of the roll film is sucked into the inner hole of the positioning jig, and the roll is moved downward so that the lower end of the roll sleeve is inserted into the positioning jig, and the part of the roll film in a shape of larger at the top and smaller at the bottom is pushed into the lower end of the roll sleeve, completing the closing operation of the film sleeve under the roll.

[0023] Compared with the prior art, the present invention has the following advantages and effects: the bag opening device of the present invention is clamped between the inner roller and the corresponding outer roller through the roll film, which ensures that the bag opener cannot move up and down and shake greatly, the bag opener cannot rotate, the downward pull-down trajectory of the roll film passing through the bag opener is stable, the success rate of bag opening is greatly improved, and the reliability of the bagging machine is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of an automatic bagging machine according to an embodiment of the present invention.

[0025] Figure 2 It is a schematic structural diagram of a bagging device according to an embodiment of the present invention.

[0026] Figure 3 It is a schematic structural diagram of a clamping unit according to an embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the internal structure of the automatic bagging machine according to an embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of the installation structure of the bag opener according to an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the bag opening principle of the bag opening device according to an embodiment of the present invention.

[0030] Figure 7 It is a schematic diagram of the arrangement structure of four groups of support units in an embodiment of the present invention.

[0031] Numbers in the figure: frame 1, conveying device 2, positioning fixture 21, bag opening device 3, bag opener 31, supporting unit 32, inner roller 321, outer roller 322, groove 323, expander 33, bagging device 4, clamping unit 41, inner clamping plate 411, outer clamping plate 412, second cylinder 413, third cylinder 414, lifting structure 42, lifting bracket 421, horizontal motion structure 43, first cylinder 431, motion bracket 432, bag cutting device 5, electric heating knife 51, bag cutting drive mechanism 52, limiting mechanism 6, pressing part 61, pressing drive part 62, lower closing device 7, mechanical claw 71, mechanical claw drive part 72, roll 8, roll film 9 DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0033] See also Figure 1-Figure 6 The automatic bagging machine of this embodiment includes a frame 1, a conveying device 2 for conveying a roll 8, a bagging device 3 for opening the opening of a roll film 9, a bagging device 4 for putting the roll film 9 on the roll 8, a bag cutting device 5 for cutting the roll film 9, an upper closing device for inserting the roll film 9 into the upper end of the roll 8, and a lower closing device 7 for inserting the roll film 9 into the lower end of the roll 8. Among them, the bagging device 3, the bagging device 4 and the bag cutting device 5 are fixed on the frame 1, and the conveying device 2 is provided with a positioning fixture 21 that moves with the conveyor. The positioning fixture 21 adopts a hollow structure.

[0034] The bag opening device 3 includes a bag opener 31 and several groups of support units 32. The support units 32 include inner rollers 321 and outer rollers 322. Several pairs of inner rollers 321 are rotatably mounted on the bag opener 31, and outer rollers 322 are rotatably mounted on the frame 1. Each outer roller 322 is correspondingly embedded in a groove 323 between a pair of inner rollers 321 to support the bag opener 31 and prevent the bag opener 31 from moving up and down. The roll film 9 is sleeved on the outside of the bag opener 31 from top to bottom, and the roll film 9 is clamped between the inner rollers 321 and the corresponding outer rollers 322.

[0035] The bag opening device 3 is clamped between the inner roller 321 and the corresponding outer roller 322 through the roll film 9, which ensures that the bag opener 31 cannot move up and down or shake significantly, and the bag opener 31 cannot rotate. The downward pull-down trajectory of the roll film 9 passing through the bag opener 31 is stable, the success rate of bag opening is greatly improved, and the reliability of the bagging machine is greatly improved.

[0036] A detachable expander 33 is fixed to the lower end of the bag opener 31. With this structure, the upper bag opener 31 is designed in two stages, and is applicable to a wide range of sizes. The lower expander 33 can be quickly replaced to meet the bagging requirements of rolls 8 of different diameters. Specifically, the expander 33 is truncated. In this embodiment, the bag opener 31 is provided with four groups of support units 32, which are distributed as follows: Figure 7 The cross section of the bag opener 31 may be square (eg Figure 7 As shown in the figure, the cross section of the bag opener 31 can also be rectangular. And those skilled in the art can easily associate that the bag opener 31 can also be provided with three or more groups of support units 32 to ensure that the bag opener 31 is stably supported.

[0037] In this embodiment, the outer roller 322 is rotatably mounted on the outer roller 322 bracket, and the outer roller 322 bracket is driven to move outward by the bracket driving module, and the outer roller 322 bracket is mounted on the frame 1. After the bag opener 31 is put on the roll film 9 in the initial stage, the outer roller 322 bracket is driven by the bracket driving module to approach the bag opener 31 until the outer roller 322 is correspondingly embedded in the groove 323 between a pair of inner rollers 321, thereby completing the support and fixation of the bag opener 31. This structure is used to facilitate the preparation of the roll film 9 in the initial stage. In this embodiment, the outer roller 322 is connected to the outer roller 322 driving mechanism, so that the outer roller 322 and the unwinding mechanism of the roll film 9 move synchronously. This structure is used to facilitate the smoother pulling of the roll film 9 downward.

[0038] The upper closing device includes a negative pressure device connected to the positioning fixture 21 and a limiting mechanism 6 for pressing the roll film 9 onto the roll 8. When the roll film 9 above the roll 8 is separated by the bag cutting device 5, the air in the positioning fixture 21 is extracted by the negative pressure device, and the roll film 9 above the roll 8 is sucked into the roll 8, completing the closing operation of the film above the roll 8. The negative pressure device adopts a negative pressure pump.

[0039] The limiting mechanism 6 includes a pressing portion 61 for pressing the roll film 9 onto the roll 8 and a pressing driving portion 62 for driving the pressing portion 61 to move. The limiting mechanism 6 is intended to prevent the roll film 9 sleeved on the roll 8 from moving upward relative to the roll 8 when the roll film 9 above the roll 8 is sucked into the roll 8. The pressing driving portion 62 is a cylinder.

[0040] The lower closing device 7 includes a mechanical claw 71 for lifting the roll 8 and a mechanical claw driving part 72 for driving the mechanical claw 71 to move up and down, and the mechanical claw driving part 72 adopts a cylinder. After the lower closing device 7 lifts the roll 8 through the mechanical claw 71, the roll 8 moves to the top of the positioning fixture 21. The lower closing device generates negative pressure through the negative pressure device, and the air in the area below the roll 8 quickly enters the positioning fixture 21, and the roll film 9 below the roll 8 is arranged by the airflow into a shape of large at the top and small at the bottom, and the lower end of the roll film is sucked into the inner hole of the positioning fixture. Then the mechanical claw 71 drives the roll 8 to move downward, so that the lower end of the roll 8 sleeve is inserted into the positioning fixture 21. In this process, the above-mentioned roll film 9 part with a large upper and small lower shape is pushed into the lower end of the roll 8 sleeve, completing the lower closing operation of the roll film 9.

[0041] The bag cutting device 5 comprises an electric heating knife 51 and a bag cutting driving mechanism 52 for driving the electric heating knife 51 to rotate. The high-temperature electric heating knife 51 rotates to cut the roll film 9 on the roll 8.

[0042] The bagging device 4 includes a plurality of clamping units 41, a lifting structure 42 for driving the clamping units 41 to move up and down, and a horizontal movement structure 43 for driving the clamping units 41 to move horizontally. The clamping units 41 include an inner clamping sheet 411, an outer clamping sheet 412, and a clamping sheet driving module for driving the inner clamping sheet 411 and the outer clamping sheet 412 to move relative to each other. The clamping unit is used to clamp the roll film 9 between the inner clamping sheet 411 and the outer clamping sheet 412. Specifically, the lifting structure 42 includes a belt transmission mechanism and a lifting bracket 421. The lifting bracket 421 is vertically slidably installed on the frame 1. The belt of the belt transmission mechanism fixes the lifting bracket 421 to drive the lifting bracket 421 to move up and down through the belt transmission mechanism. The horizontal motion structure 43 includes a first cylinder 431 and a motion bracket 432. The cylinder body and the telescopic rod of the first cylinder 431 respectively fix the lifting bracket 421 and the motion bracket 432. The clamping plate driving module includes a second cylinder 413 and a third cylinder 414. The telescopic rod of the second cylinder 413 and the telescopic rod of the third cylinder 414 respectively fix the inner clamping plate 411 and the outer clamping plate 412. The cylinder body of the second cylinder 413 and the cylinder body of the third cylinder 414 are both fixed to the motion bracket 432.

[0043] The up and down movement of the bagging device 4 is driven by a servo motor, which makes it convenient to accurately control the up and down movement position of the bagging device 4 according to the bag length and switch the specifications with one click; the conveying device 2 is driven by a servo motor, and the reel 8 is accurately positioned on the positioning fixture 21 of the conveying device 2 without damaging the silk thread of the reel 8.

[0044] The working process of an automatic bagging machine includes the following steps:

[0045] (1) Step S1, the roll film 9 is placed on the outside of the bag opener 31 from top to bottom, and the bag opener 31 is supported by the support unit 32 so that the bag opener 31 cannot move up and down;

[0046] (2) Step S2, the conveying device 2 moves the roll 8 to be bagged to the position directly below the bag opener 31;

[0047] (3) Step S3, the bagging device 4 clamps the lower end of the roll film 9 and pulls the roll film 9 downward, and then sleeves the roll film 9 on the roll 8;

[0048] (4) Step S4, the limiting mechanism 6 presses the roll film 9 onto the roll 8 through the movable and extended pressing portion 61;

[0049] (5) Step S5, the bag cutting device 5 rotates the high-temperature electric heating knife 51 to cut the roll film 9 on the roll 8;

[0050] (6) Step S6: Under the action of negative pressure, air quickly enters the reel 8 and the positioning fixture 21 through the upper end of the reel 8, bringing the upper end of the roll film 9 sleeved on the reel 8 into the reel 8, completing the closing operation of the film sleeve on the reel 8.

[0051] (7) Step S7, the mechanical claw 71 is inserted into the roll 8, the mechanical claw 71 is stretched open, and then the mechanical claw 71 rises, thereby driving the roll 8 to move upward. Under the action of negative pressure, air quickly enters the positioning fixture 21 from the upper end of the positioning fixture 21, and the lower end portion of the roll film 9 sleeved on the roll 8 is arranged into a shape of larger upper part and smaller lower part, and the lower end portion of the roll film is sucked into the inner hole of the positioning fixture, and the roll 8 is moved downward, so that the lower end of the roll 8 sleeve is inserted into the positioning fixture 21, and the roll film 9 portion in the shape of larger upper part and smaller lower part is pushed into the lower end of the roll 8 sleeve, completing the closing operation of the film sleeve under the roll 8, and the mechanical claw 71 is reset and rises, and the roll 8 is brought to the next process by the conveying device 2 along with the conveying device 2.

[0052] The bag opening device 3 of this embodiment is clamped between the inner roller 321 and the corresponding outer roller 322 by the roll film 9, which ensures that the bag opener 31 cannot move up and down or shake significantly, and the bag opener 31 cannot rotate. The downward pulling trajectory of the roll film 9 passing through the bag opener 31 is stable, the success rate of bag opening is greatly improved, and the reliability of the bagging machine is greatly improved.

[0053] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A bag opening device, characterized in that: It includes a bag opener and several groups of supporting units, wherein the supporting units include inner rollers and outer rollers. Several pairs of inner rollers are rotatably mounted on the bag opener, and outer rollers are rotatably mounted on the frame. Each outer roller is correspondingly embedded in a groove between a pair of inner rollers to support the bag opener and prevent the bag opener from moving up and down. The roll film is sleeved on the outside of the bag opener from top to bottom, and the roll film is clamped between the inner rollers and the corresponding outer rollers.

2. The bag opening device according to claim 1, characterized in that: A detachable expander is fixed to the lower end of the bag opener.

3. An automatic bagging machine, comprising a frame, a conveying device for conveying a roll, a bagging device for opening the mouth of a roll film, a bagging device for putting the roll film on the roll, and a bag cutting device for cutting the roll film, wherein: The bag opening device, bagging device and bag cutting device are fixed on the frame, and the conveying device is provided with positioning fixtures that move with the conveyor, characterized in that: the bag opening device is as described in any one of claims 1-2.

4. The automatic bagging machine according to claim 3, characterized in that: It also includes an upper closing device for inserting the roll film into the upper end of the roll, and the upper closing device includes a negative pressure device connected to the positioning fixture.

5. The automatic bagging machine according to claim 4, characterized in that: The upper closing device also includes a limiting mechanism for pressing the roll film onto the roll, and the limiting mechanism includes a pressing part for pressing the roll film onto the roll and a pressing driving part for driving the pressing part to move.

6. The automatic bagging machine according to claim 4, characterized in that: It also includes a lower closing device for inserting the roll film into the lower end of the roll, and the lower closing device includes a mechanical claw for lifting the roll and a mechanical claw driving part for driving the mechanical claw to move up and down, and the mechanical claw driving part adopts a cylinder.

7. The automatic bagging machine according to claim 3, characterized in that: The bag cutting device comprises an electric heating knife and a bag cutting driving mechanism for driving the electric heating knife to rotate.

8. The automatic bagging machine according to claim 3, characterized in that: The bagging device includes a plurality of clamping units, a lifting structure for driving the clamping units to move up and down, and a horizontal movement structure for driving the clamping units to move horizontally. The clamping units include an inner clamping plate, an outer clamping plate, and a clamping plate driving module for driving the inner clamping plate and the outer clamping plate to move relative to each other.

9. The automatic bagging machine according to claim 3, characterized in that: The up and down movement of the bagging device is driven by a servo motor, and the conveying device is driven by a servo motor.

10. A bagging method for an automated bagging machine as claimed in claims 3 to 9, characterized in that: The steps include: (1) Step S1, the roll film is sleeved on the outside of the bag opener from top to bottom, and an outer roller is rotatably mounted on the frame, and each outer roller is correspondingly embedded in a groove between a pair of inner rollers to support the bag opener and prevent the bag opener from moving up and down; (2) Step S2, moving the roll to be bagged to the position directly below the bag opener; (3) Step S3, pulling the roll film downward and sleeve the roll film on the roll; (4) Step S4, pressing the roll film onto the roll; (5) Step S5, cutting the roll film above the roll; (6) Step S6: Under the action of negative pressure, air quickly enters the roll through the upper end of the roll, bringing the upper end of the roll film sleeved on the roll into the roll, completing the closing operation of the film sleeve on the roll. (7) Step S7, the roll is lifted up, and under the action of negative pressure, air quickly enters the positioning jig through the upper end of the positioning jig, and the lower end of the roll film sleeved on the roll is arranged into a shape of larger at the top and smaller at the bottom. The lower end of the roll film is sucked into the inner hole of the positioning jig, and the roll is moved downward so that the lower end of the roll sleeve is inserted into the positioning jig, and the part of the roll film in a shape of larger at the top and smaller at the bottom is pushed into the lower end of the roll sleeve, completing the closing operation of the film sleeve under the roll.

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