Constant-pressure heat sealing mechanism for packaging bag

Abstract

The utility model discloses a packaging bag constant-pressure heat sealing mechanism, which relates to the technical field of product packaging and comprises a fixing plate, the fixing plate is provided with a centering mechanism, and the centering mechanism comprises a front compression cylinder mounting plate and a rear compression cylinder mounting plate which are symmetrically and slidably connected to the bottom of the fixing plate; the sides, close to each other, of the front pressing air cylinder mounting plate and the rear pressing air cylinder mounting plate are each fixedly connected with a heat sealing cutter. The bottom of the fixing plate is rotationally connected with a double-end lead screw, and the double-end lead screw is driven by a servo motor. The front pressing air cylinder mounting plate and the rear pressing air cylinder mounting plate are arranged at the two ends of the double-end lead screw in a sleeving mode correspondingly. The servo motor is mounted at the top of the fixed plate; the centering mechanism is arranged, the force of mutual extrusion between the two heat-sealing cutters is adjusted through the servo motor, the heat-sealing pressure is adjusted, the pressures of the heat-sealing cutters on the two sides are made to be consistent, the phenomena of misalignment and the like of sealing openings of packaging bags are avoided, and therefore the heat-sealing effect on the packaging bags is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of product packaging, in particular to a constant pressure heat sealing mechanism for a packaging bag. Background Art

[0002] When using plastic bags to package products, in order to ensure its sealing, a heat sealing method is generally used. The material at the sealing point is heated to reach a viscous flow state and then pressurized to make it sticky and sealed.

[0003] There are also technical solutions for heat-sealing mechanisms for packaging bags in the prior art, such as a utility model patent with application number CN2022208111017, which discloses a heat-sealing mechanism for packaging bags for pudding production, including a bottom plate and a vertical plate, the vertical plate is fixedly arranged in the middle of the upper surface of the bottom plate, a rotating rod is rotatably arranged at the middle end of the front side of the vertical plate, a rotating bar is fixedly sleeved on the rod wall of the rotating rod, and heat-sealing knives are fixedly arranged on the lower surfaces of both ends of the rotating bar, a spur gear is arranged on the rear side of the vertical plate, the spur gear is fixedly sleeved with the rear end of the rotating rod, two side plates are fixedly arranged on the rear side of the vertical plate, a reciprocating screw is rotatably arranged between the two side plates, a slide plate is threadedly sleeved on the rod wall of the reciprocating screw, a rack is fixedly arranged on the lower surface of the slide plate, the rack is meshed with the spur gear, and a first motor is arranged on the outer side of one side plate. This solution can heat-seal packaging bags for two production lines at the same time, thereby improving production efficiency.

[0004] However, the existing heat sealing mechanism has the following problems when used:

[0005] (1) The pressure of the heat sealing knives on both sides is inconsistent, resulting in the wrong side of the packaging bag seal;

[0006] (2) The heat sealing knife pressure is difficult to adjust and the pressure value cannot be effectively controlled, thus affecting the sealing effect;

[0007] To this end, the utility model provides a constant pressure heat sealing mechanism for a packaging bag. Utility Model Content

[0008] The utility model aims to provide a constant pressure heat sealing mechanism for a packaging bag.

[0009] The technical problems solved by the utility model are: (1) the pressure of the heat sealing knives on both sides is inconsistent, resulting in the phenomenon of misalignment of the sealing edge of the packaging bag;

[0010] (2) The heat sealing knife pressure is difficult to adjust and the pressure value cannot be effectively controlled, thus affecting the sealing effect.

[0011] The utility model can be implemented through the following technical scheme: a constant pressure heat sealing mechanism for a packaging bag, comprising a fixed plate, the fixed plate is provided with a centering mechanism, the centering mechanism comprises a front pressing cylinder mounting plate and a rear pressing cylinder mounting plate which are slidably connected to the bottom of the fixed plate and are parallel to each other; the front pressing cylinder mounting plate and the rear pressing cylinder mounting plate are both fixedly connected with heat sealing knives on one side close to each other; a double-headed screw rod is rotatably connected to the bottom of the fixed plate, and the double-headed screw rod is driven by a servo motor; the two ends of the double-headed screw rod respectively penetrate the front pressing cylinder mounting plate and the rear pressing cylinder mounting plate.

[0012] A further technical improvement of the utility model is that the servo motor is installed on the top of the fixed plate, a double-headed synchronous wheel is fixedly connected to the end of the output shaft of the servo motor, two double-headed screw rods are provided, and the two double-headed screw rods are symmetrically arranged at the bottom of the fixed plate; both ends of each double-headed screw rod are fixedly connected to a single-headed synchronous wheel, and the single-headed synchronous wheel and the double-headed synchronous wheel are connected by a synchronous belt.

[0013] The further technical improvement of the utility model is that a vacuum cylinder is installed on the top of the fixed plate, a vacuum pipe is fixedly connected to the bottom end of the output rod of the vacuum cylinder, and one end of the vacuum pipe is connected to the vacuum generator.

[0014] A further technical improvement of the utility model is that a plurality of vacuum pressing knife cylinders are respectively installed on the outer side walls of the front pressing cylinder mounting plate and the rear pressing cylinder mounting plate, and the output rod ends of the plurality of vacuum pressing knife cylinders are all fixedly connected with packaging bag pressing knives.

[0015] A further technical improvement of the utility model is that the end of the air extraction pipe is in a flat state, and a plurality of air holes are evenly opened on the side wall of the air extraction pipe.

[0016] A further technical improvement of the utility model is that a No. 1 guide shaft is penetrated and slidably connected to the side walls of the front pressing cylinder mounting plate and the rear pressing cylinder mounting plate, and one end of the No. 1 guide shaft is fixedly connected to the packaging bag pressing knife.

[0017] A further technical improvement of the utility model is that an elastic layer is fixedly connected to the side wall of the packaging bag pressing knife.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. In the utility model, the spacing between the front and rear pressing cylinder mounting plates can be quickly adjusted through the operation of the servo motor, so as to adapt to packaging bags of various specifications; and according to the sealing effect, the servo motor can adjust the mutual squeezing force between the two heat sealing knives to adjust the heat sealing pressure, so that the pressure of the heat sealing knives on both sides is consistent, avoiding the phenomenon of misalignment of the packaging bag sealing, and at the same time, the heat sealing pressure can be controlled more accurately, so as to ensure the heat sealing effect of the packaging bag.

[0020] 2. The utility model provides an elastic layer so that there is a certain buffer distance between the two packaging bag pressing knives, which is convenient for the subsequent heat sealing of the packaging bag by the two heat sealing knives; at the same time, when the two packaging bag pressing knives clamp the packaging bag, the exhaust pipe is also wrapped and squeezed by the elastic layer, so that the packaging bag is in close contact with the exhaust pipe, thereby improving the sealing at this position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the external structure of the utility model from another perspective;

[0024] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the packaging bag pressing knife in the utility model.

[0025] In the figure: 1. Vacuum cylinder; 2. Servo motor; 3. Rear clamping cylinder mounting plate; 4. Heat sealing knife; 5. Packaging bag clamping knife; 6. No. 1 double-headed screw rod; 7. No. 1 guide shaft; 8. Double-headed synchronous wheel; 9. No. 2 guide shaft; 10. Vacuum clamping knife cylinder; 11. Front clamping cylinder mounting plate; 12. No. 2 double-headed screw rod; 13. Fixed plate; 14. Vacuum pipe; 15. Elastic layer. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] See also Figure 1-Figure 3As shown, a constant pressure heat sealing mechanism for packaging bags includes a fixed plate 13, a servo motor 2 is installed on the top of the fixed plate 13, the output shaft of the servo motor 2 is fixedly connected to a double-headed synchronous wheel 8, and the bottom of the fixed plate 13 is slidably connected to a front pressing cylinder mounting plate 11 and a rear pressing cylinder mounting plate 3, and the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3 are symmetrically arranged at the bottom of the fixed plate 13; the bottom of the fixed plate 13 is rotatably connected to a No. 1 double-headed screw rod 6 and a No. 2 double-headed screw rod 12, and the No. 1 double-headed screw rod 6 and the No. 2 double-headed screw rod 12 are symmetrically arranged at the bottom of the fixed plate 13; both ends of the No. 1 double-headed screw rod 6 pass through the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3, and the No. 2 double-headed screw rod 12 passes through the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3. Both ends of the No. 1 double-headed screw 12 also penetrate the front clamping cylinder mounting plate 11 and the rear clamping cylinder mounting plate 3; the two ends of the No. 1 double-headed screw 6 and the No. 2 double-headed screw 12 are respectively sleeved and fixedly connected with single-headed synchronous wheels, and the double-headed synchronous wheel 8 is connected to the single-headed synchronous wheel through a synchronous belt; when working, the servo motor 2 rotates forward, and the double-headed synchronous wheel 8 is driven to rotate by the servo motor 2. The double-headed synchronous wheel 8 drives the two single-headed synchronous wheels to rotate through the action of the synchronous belt, so that the two single-headed synchronous wheels drive the No. 1 double-headed screw 6 and the No. 2 double-headed screw 12 to rotate together, thereby making the front clamping cylinder mounting plate 11 and the rear clamping cylinder mounting plate 3 close to each other, which is convenient for the subsequent vacuuming and heat sealing of the packaging bag;

[0028] A support frame is fixedly connected to the top of the fixed plate 13, and a vacuum cylinder 1 is installed on the top of the support frame. The bottom end of the output rod of the vacuum cylinder 1 is fixedly connected to an exhaust pipe 14, and one end of the exhaust pipe 14 is connected to the vacuum generator; four exhaust knife cylinders 10 are respectively installed on the outer walls of the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3, and the output rod of the exhaust knife cylinder 10 on the front pressing cylinder mounting plate 11 passes through and is slidably connected to the front pressing cylinder mounting plate 11, and the output rod of the exhaust knife cylinder 10 on the rear pressing cylinder mounting plate 3 passes through and is slidably connected to the rear pressing cylinder mounting plate 3, and the ends of the output rods of the multiple exhaust knife cylinders 10 are fixedly connected to packaging bags Pressing knife 5; the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3 are fixedly connected with a heat sealing knife 4 on the side close to each other; when the packaging bag reaches the preset vacuuming and pressing position, the output rod of the vacuum cylinder 1 drives the vacuum pipe 14 to move downward, and the vacuum pipe 14 is inserted into the packaging bag, and at the same time, the vacuum pressing knife cylinder 10 is started, so that the packaging bag pressing knife 5 extends out and presses the packaging bag mouth, and then the vacuum generator is started to vacuum the packaging bag; after the vacuuming is completed, the vacuum cylinder 1 drives the vacuum pipe 14 to leave the packaging bag, and then the servo motor 2 rotates forward to heat the heat sealing knife 4, so that the heat sealing knife 4 heat-seals the packaging bag according to the set value (pressure, heating time).

[0029] In order to improve the accuracy of the movement direction of the packaging bag pressing knife 5, a No. 1 guide shaft 7 is penetrated and slidably connected to the side walls of the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3, and one end of the No. 1 guide shaft 7 is fixed to the packaging bag pressing knife 5;

[0030] In order to improve the sliding stability of the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3, a second guide shaft 9 is fixedly connected to the bottom of the fixing plate 13, and the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3 are respectively sleeved and slidably connected to the two ends of the second guide shaft 9;

[0031] The end of the exhaust pipe 14 is flat, and a plurality of air holes are evenly formed on the side wall of the exhaust pipe 14. By providing the flat exhaust pipe 14, when the two packaging bag pressing knives 5 press the packaging bag, the packaging bag is in close contact with the exhaust pipe 14, and the packaging bag is evacuated through the action of the vacuum generator and the exhaust pipe 14.

[0032] An elastic layer 15 is fixedly connected to the side wall of the packaging bag pressing knife 5; by providing the elastic layer 15, a certain buffer distance is provided between the two packaging bag pressing knives 5, which facilitates the subsequent heat sealing of the packaging bag by the two heat sealing knives 4; at the same time, when the two packaging bag pressing knives 5 clamp the packaging bag, the exhaust pipe 14 is also wrapped and squeezed by the elastic layer 15, so that the packaging bag is in close contact with the exhaust pipe 14.

[0033] When the utility model is in use, after the packaging bag reaches the predetermined heat-sealing position, the servo motor 2 is started, so that the servo motor 2 rotates forward, and the double-headed synchronous wheel 8 is driven to rotate by the servo motor 2. The double-headed synchronous wheel 8 drives the two single-headed synchronous wheels to rotate through the action of the synchronous belt, so that the two single-headed synchronous wheels drive the first double-headed screw rod 6 and the second double-headed screw rod 12 to rotate together, thereby making the front pressing cylinder mounting plate 11 and the rear pressing cylinder mounting plate 3 approach each other, so that the front and rear pressing cylinder mounting plates 3 move toward the center to reach the preset vacuum pressing position;

[0034] When the packaging bag reaches the preset vacuuming and pressing position, the output rod of the vacuum cylinder 1 drives the vacuum pipe 14 to move downward, so that the vacuum pipe 14 is inserted into the packaging bag, and at the same time, the vacuum pressing knife cylinder 10 is started, so that the packaging bag pressing knife 5 extends out and presses the packaging bag mouth, and then the vacuum generator is started to vacuum the packaging bag; after the vacuuming is completed, the vacuum cylinder 1 drives the vacuum pipe 14 to leave the packaging bag, and then the servo motor 2 rotates forward to heat the heat sealing knife 4, so that the heat sealing knife 4 heat-seals the packaging bag according to the set value (pressure, heating time); after the heat sealing is completed, the servo motor 2 reverses to reach the preset vacuuming and pressing position, and after the packaging bag reaches the bag placing position, the servo motor 2 continues to reverse to reach the initial position for the second heat sealing.

[0035] In the present application, the vacuum generator is a prior art, and its model is P6010.AE.01.LA.52, and its specific structure and function are not described in detail here.

[0036] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A packaging bag constant pressure heat sealing mechanism, comprising a fixing plate (13), characterized in that: The fixing plate (13) is provided with a centering mechanism, which comprises a front pressing cylinder mounting plate (11) and a rear pressing cylinder mounting plate (3) which are slidably connected to the bottom of the fixing plate (13) and are parallel to each other; the front pressing cylinder mounting plate (11) and the rear pressing cylinder mounting plate (3) are both fixedly connected with a heat sealing knife (4) on the side close to each other; the bottom of the fixing plate (13) is rotatably connected with a double-headed screw rod, and the double-headed screw rod is driven by a servo motor (2); the two ends of the double-headed screw rod respectively penetrate the front pressing cylinder mounting plate (11) and the rear pressing cylinder mounting plate (3).

2. The packaging bag constant pressure heat sealing mechanism according to claim 1, characterized in that: The servo motor (2) is mounted on the top of the fixed plate (13); the end of the output shaft of the servo motor (2) is fixedly connected to a double-headed synchronous wheel (8); there are two double-headed screw rods in total, and the two double-headed screw rods are symmetrically arranged at the bottom of the fixed plate (13); both ends of each double-headed screw rod are fixedly connected to a single-headed synchronous wheel, and the single-headed synchronous wheel is connected to the double-headed synchronous wheel (8) via a synchronous belt.

3. The packaging bag constant pressure heat sealing mechanism according to claim 1, characterized in that: A vacuum cylinder (1) is installed on the top of the fixed plate (13), a vacuum pipe (14) is fixedly connected to the bottom end of the output rod of the vacuum cylinder (1), and one end of the vacuum pipe (14) is connected to a vacuum generator.

4. The packaging bag constant pressure heat sealing mechanism according to claim 1, characterized in that: A plurality of air-exhaust and pressure-knife cylinders (10) are respectively installed on the outer side walls of the front pressure-knife mounting plate (11) and the rear pressure-knife mounting plate (3), and the ends of the output rods of the plurality of air-exhaust and pressure-knife cylinders (10) are all fixedly connected to packaging bag pressure knives (5).

5. The packaging bag constant pressure heat sealing mechanism according to claim 3, characterized in that: The end of the air extraction pipe (14) is in a flat state, and a plurality of air holes are evenly provided on the side wall of the air extraction pipe (14).

6. The packaging bag constant pressure heat sealing mechanism according to claim 1, characterized in that: A first guide shaft (7) is penetrated and slidably connected to the side walls of the front pressing cylinder mounting plate (11) and the rear pressing cylinder mounting plate (3), and one end of the first guide shaft (7) is fixedly connected to the packaging bag pressing knife (5).

7. The packaging bag constant pressure heat sealing mechanism according to claim 4, characterized in that: An elastic layer (15) is fixedly connected to the side wall of the packaging bag pressing knife (5).

Images