A membrane wrapping machine oven structure

Abstract

A membrane wrapping machine oven structure is provided with a number of intermediate air duct plates between the side air duct plates on both sides inside the box body, and a bottom air duct plate is also provided at the bottom of the box body. Each air duct plate is respectively connected to different hot air blowers through air inlet pipes; the side air duct plates are connected to the screw nut pair through a transmission frame, so as to move horizontally relatively or away from each other, and the intermediate air duct plates are driven by an upper gear, a lower gear, a lifting swing arm and a rotating swing arm to lift and rotate, so that the intermediate air duct plates leave or extend into the channels, thereby changing the number and size of the channels. The structure of this membrane wrapping machine oven is simple, and the adjustment process is fast, accurate and stable. Through its use, the number and width of the channels can be changed conveniently and quickly to meet the production needs of different products and improve production efficiency.

Description

Technical Field

[0001] The present invention relates to a film wrapping machine, and in particular to an oven structure on a film wrapping machine for heating a packaging film to shrink the packaging film. Background Art

[0002] A film wrapping machine is a device for packaging products using a plastic film. An oven for heating the packaging film is provided on the film wrapping machine, and a passage for conveying the packaged products is provided inside the oven. By heating the packaged products in the passage, the packaging film is heated up and shrinks to closely adhere to the products to form a package, and after the packaging is formed, it is output after cooling.

[0003] In the existing film wrapping machine oven, only a single type of passage is provided inside, either a single passage, or two or more parallel passages, etc. A single passage is suitable for products with larger sizes, while multiple passages are suitable for products with smaller sizes to heat a larger number of products simultaneously, thereby improving production efficiency. If it is necessary to change the number of passages inside the oven, it is necessary to repeatedly install and disassemble the passage components. This not only requires a large amount of labor, but also consumes a large amount of working hours waiting for the air duct components to cool, and the installation and disassembly operations are extremely troublesome. Summary of the Invention

[0004] The purpose of the present invention is to provide an oven structure for a film wrapping machine with adjustable passage number and size to meet the production needs of different products and improve production efficiency.

[0005] The oven structure of the film wrapping machine described in the present invention includes side air duct plates respectively arranged on both sides inside the box body. A plurality of intermediate air duct plates for separating spaces are arranged at intervals between the two side air duct plates. The interiors of the side air duct plates and the intermediate air duct plates are hollow. A plurality of air blowing holes communicating with the interior are respectively opened on the inner sides of the side air duct plates and both sides of the intermediate air duct plates. The side air duct plates and the intermediate air duct plates are respectively connected to a hot air blower for providing hot air through air inlet pipes; a movable slider and a transverse movement driver for driving the slider to move are installed on the box body, and the moving direction of the slider is perpendicular to the passage direction. A transmission frame for connecting the slider and moving with the slider is arranged on the side air duct plate; upper gears, lower gears, lifting swing arms and rotating swing arms are also installed on the box body at positions opposite to the ends of the intermediate air duct plates. The upper gears are arranged above the lower gears and mesh with each other. One end of the upper gear is coaxially installed on a rotating shaft with the lifting swing arm, and the rotating shaft is connected to a rotating driver for driving its rotation. The other end of the lifting swing arm is hinged to the end of the intermediate air duct plate. One end of the rotating swing arm is connected to the lower gear through a connecting shaft. A rotating groove is also arranged on the rotating swing arm. A sliding pin is installed at the end of the intermediate air duct plate, and the end of the sliding pin is located in the rotating groove and slides relatively along the rotating groove.

[0006] The oven structure of the film wrapping machine described in the present invention has side air duct plates and middle air duct plates in the oven cavity arranged at intervals in sequence, dividing the space into several parallel heating channels. The hot air blower blows hot air into the heating channels through the air inlet pipe to heat the packaging film on the packaged product. Among them, the side air duct plate is connected to the slider through the transmission frame arranged on it, and the transverse movement driver can drive the side air duct plate to move towards or away from the middle air duct plate through the slider and the transmission frame, thereby changing the distance between the two side air duct plates; while one side of the middle air duct plate is hinged to the lifting swing arm and the other side is connected to the rotating swing arm through the sliding pin. When the rotation driver works, it will drive the upper gear and the lifting swing arm to rotate through the rotating shaft. At the same time, the upper gear drives the connecting shaft and the rotating swing arm to rotate through the lower gear meshing with it. Thus, the lifting swing arm and the rotating swing arm will rotate simultaneously as the rotation driver works. During this process, on the one hand, the lifting swing arm will drive the middle air duct plate to lift through the hinged end with the middle air duct plate. On the other hand, the rotating swing arm applies a force to the sliding pin arranged on the middle air duct plate through the rotating groove arranged on it, causing the middle air duct plate to rotate, and finally making the middle air duct plate perform lifting and rotating movements simultaneously. When fewer and wider channels are required, drive the middle air duct plate to rise and rotate to a certain height so that the middle air duct plate is separated from the lower channels, and the channels on both sides of the middle air duct plate can be combined; while when more and narrower channels are required, vice versa, reset the raised middle air duct plate into the channels; in addition, when fewer and narrower channels are required, on the one hand, raise the middle air duct plate, and on the other hand, drive the side air duct plates to move inward, thereby reducing the width of the entire channel, and the adjustment can be achieved. The structure of the oven structure of this film wrapping machine is simple, and the adjustment process is fast, accurate, and stable. Through its use, the number and width of the channels can be changed conveniently and quickly to meet the production needs of different products and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic structural diagram of the oven structure of the film wrapping machine.

[0008] Figure 2 is a schematic position structure diagram of the side air duct plate and the middle air duct plate.

[0009] Figure 3 is Figure 2 an enlarged schematic diagram of the position shown at A.

[0010] Figure 4 is Figure 2 an enlarged schematic diagram of the position shown at B.

[0011] Figure 5 is Figure 2 an enlarged schematic diagram of the position shown at C.

[0012] Figure 6It is a schematic structural diagram in which the middle air duct plate is in a vertical state to separate multiple channels.

[0013] Figure 7 It is a schematic structural diagram in which the middle air duct plate is in a horizontal state to merge adjacent channels.

[0014] Figure 8 It is a schematic structural diagram during the movement of the middle air duct plate.

[0015] Figure 9 Schematic structural diagram of a hot air blower and an air volume regulating device.

[0016] Figure 10 It is Figure 9 Schematic side structural diagram of the shown hot air blower and air volume regulating device.

[0017] Figure 11 It is Figure 9 Schematic structural diagram of the windshield installation of the shown hot air blower and air volume regulating device.

[0018] Figure 12 Schematic structural diagram of the bottom air duct plate and the air volume regulating device.

[0019] Figure 13 It is Figure 12 Enlarged schematic diagram of the position D shown.

[0020] Figure 14 Schematic structural diagram of the connection between the rack and the gear on the air hole plate. Detailed implementation

[0021] A film wrapping machine oven structure includes side air duct plates 2 respectively arranged on both sides inside the box body 1. There are several middle air duct plates 3 for separating spaces arranged at intervals between the two side air duct plates. The interiors of the side air duct plates and the middle air duct plates are hollow. A number of air blowing holes communicating with the interiors are respectively opened on the inner sides of the side air duct plates and both sides of the middle air duct plates. The side air duct plates and the middle air duct plates are also respectively connected to a hot air blower 5 providing hot air through air inlet pipes 4; A movable slider 6 and a transverse movement driver 7 for driving the slider to move are installed on the box body, and the moving direction of the slider is perpendicular to the channel direction. A transmission frame 8 connected to the slider and moving with the slider is arranged on the side air duct plate; A top gear 9, a bottom gear 10, a lifting swing arm 11 and a rotating swing arm 12 are also installed on the box body at positions opposite to the ends of the middle air duct plates. The top gear is arranged above the bottom gear and meshes with each other. The top gear is coaxial with one end of the lifting swing arm and is installed on a rotating shaft 13. The rotating shaft is connected to a rotating driver for driving its rotation. The other end of the lifting swing arm is hinged to the end of the middle air duct plate. One end of the rotating swing arm is connected to the bottom gear through a connecting shaft 14. A rotating groove is also arranged on the rotating swing arm. A sliding pin 15 is installed at the end of the middle air duct plate, and the end of the sliding pin is located in the rotating groove and slides relatively along the rotating groove.

[0022] As Figure 1-14 shown, there is an intermediate air duct plate inside the oven, which divides the space into two channels. Among them, the side air duct plate is connected to the slider through the transmission frame arranged on it, and the transverse movement driver can drive the side air duct plate to move towards or away from the intermediate air duct plate through the slider and the transmission frame, so as to change the distance between the two side air duct plates; while the intermediate air duct plate is hinged to the lifting swing arm on one side and connected to the rotating swing arm through the sliding pin on the other side. When the rotating driver works, it will drive the upper gear and the lifting swing arm to rotate through the rotating shaft. At the same time, the upper gear drives the connecting shaft and the rotating swing arm to rotate through the lower gear meshing with it. Thus, the lifting swing arm and the rotating swing arm will rotate simultaneously with the work of the rotating driver. In this process, on the one hand, the lifting swing arm will drive the intermediate air duct plate to lift through the hinged end with the intermediate air duct plate. On the other hand, the rotating swing arm applies a force to the sliding pin arranged on the intermediate air duct plate through the rotating groove arranged on it, causing the intermediate air duct plate to rotate. Finally, the intermediate air duct plate performs lifting and rotating movements simultaneously. When fewer and wider channels are needed, drive the intermediate air duct plate to rise and rotate to a certain height to disconnect the intermediate air duct plate from the lower channel, so that the channels on both sides of the intermediate air duct plate can be combined; while when more and narrower channels are needed, on the contrary, reset the raised intermediate air duct plate into the channel; in addition, when fewer and narrower channels are needed, on the one hand, raise the intermediate air duct plate, and on the other hand, drive the side air duct plate to move inwards, so as to reduce the width of the whole channel, and the adjustment can be realized. The structure of the film wrapping machine oven is simple, and the adjustment process is fast, accurate and stable. Through its use, the number and width of the channels can be changed conveniently and quickly to meet the production needs of different products and improve production efficiency.

[0023] In the film wrapping machine oven structure described above, a bottom air duct plate 16 is installed below the channels separated by the side air duct plate 2 and the intermediate air duct plate inside the box body 1. The bottom air duct plate is hollow and there are several blowing holes on the top surface. The side air duct plate, the intermediate air duct plate and the bottom air duct plate are respectively connected to different hot air blowers 5 through different air inlet pipes 4; on the one hand, the temperature and air volume of the hot air are controlled by different hot air blowers, and on the other hand, when the intermediate air duct plate rises, it is convenient to stop the hot air blower connected to it to stop blowing hot air from the intermediate air duct plate. In addition, the bottom air duct plate 16 can include several sub-air duct plates arranged in sequence along the channel direction, and each sub-air duct plate is respectively connected to different hot air blowers 5 to meet specific ventilation requirements.

[0024] The described hot air blower 5 includes a heating box 51 with a heating tube inside and a blower 52 connected to the air inlet of the heating box. The air outlet of the heating box is connected to the air inlet pipe 4. Along the direction from the air inlet to the air outlet in the heating box, finned heating tubes 53 and ordinary heating tubes 54 are arranged alternately at intervals. A number of fins are provided on the outer wall of the finned heating tubes. The blower blows air into the heating box, and after being heated by the heating tubes, it is heated into hot air and blown into the air inlet pipe. The hot air blower with this structure is simple in structure, and has fast, stable heating and high heating energy efficiency. At the same time, the blower 52 is installed on the box body 1. An air return port is opened on the box body opposite to the channel and is communicated with the air inlet of the blower, so that the hot air after heating the packaged product re-enters the blower and the heating box, thereby reducing heat loss and energy consumption. Also, air volume regulating devices for controlling the air volume are respectively provided between the side air duct plate 2, the middle air duct plate 3 and the bottom air duct plate 16 and the corresponding air inlet pipes 4. The air duct regulating device can be as Figure 9-11 shown, including a wind deflector 55 arranged inside the air outlet of the heating box 51 and a rotatable adjusting rod 56. One end of the adjusting rod is connected to the wind deflector. By rotating the adjusting rod, the wind deflector rotates inside the air outlet, thereby changing the gap between the wind deflector and the inner wall of the air outlet, and also changing the air volume, thus forming air volume regulation. In addition, there is a fixed adjusting plate 57. The other end of the adjusting rod 56 passes through the adjusting plate and is connected with an indicating rod 58. And an indicating mark is provided at the position corresponding to the rotation stroke range of the adjusting plate and the indicating rod. The indicating mark can be a scale line or a positioning hole. At the same time, a positioning through hole is provided on the indicating rod. After rotating to the required position, the indicating rod is fixed by inserting a pin through the positioning through hole and the positioning hole to maintain the required air volume. The air volume regulating device corresponding to the bottom air duct plate 16 can also be as Figure 12-14 shown, including a number of air hole plates 61 arranged on the top surface of the bottom air duct plate. Air holes are opened on the air hole plates corresponding to the blowing holes of the bottom air duct plate. A number of long strip holes 62 are also opened on the air hole plates along the channel direction. Bolts 63 pass through the long strip holes and are fixed to the bottom air duct plate. A rack 64 is provided at the end of the air hole plate. There is also a rotatable air volume control rod 65. A gear 66 is installed at one end of the air volume control rod. The gear and the rack are meshed with each other. Thus, the movement of the air hole plate is controlled by the air volume control rod, the gear and the rack, so that the air holes on the air hole plate coincide with, partially coincide with or do not coincide with the blowing holes of the bottom air duct plate, thereby realizing air volume control.

[0025] For the described film wrapping machine oven structure, drive racks 8 are provided on both sides of the side air duct plate 2 along the two sides in the channel direction. The drive racks on both sides are respectively connected with transverse movement drivers 7 through sliders 6. The overall translation of the side air duct plate can be achieved by driving of the transverse movement drivers on both sides. If the driving distances of the transverse movement drivers on both sides are different, the side air duct plate can be inclined relative to its original position, finally forming a trumpet-shaped channel with a wider inlet or a wider outlet to meet the conveying requirements of various products. Additionally, the drive rack 8 can also be installed on one side of the side air duct plate 2 along the channel direction, and the other side is hinged to the box body 1, thereby forming a trumpet-shaped channel through the movement on one side. The transverse movement driver 7 is a lead screw, the axial direction of the lead screw is perpendicular to the channel direction, and the slider 6 is a sliding nut installed on the lead screw; the drive rack 8 is U-shaped, the inner side of the U-shape of the drive rack is sleeved outside the slider 6, sliding grooves 81 are opened along the channel direction on both sides of the U-shape of the drive rack, and sliding columns 60 extending into the sliding grooves are arranged on the slider, so that when the drive rack moves along with the sliding nut along the lead screw, the relative position between the two can be adjusted automatically, which can improve the smoothness of the movement of the side air duct plate and can also reduce the requirement for the matching accuracy of both sides of the side air duct plate, thus reducing the production and maintenance difficulties.

[0026] For the described film wrapping machine oven structure, rotary drivers can be respectively arranged on both sides of the middle air duct plate 3 along the channel direction, and the middle air duct plate is driven by the two rotary drivers. Or a rotary driver can be arranged on one side, and both ends of the rotary shaft 13 are respectively connected with the upper gears 9 and the lifting swing arms 11 on both sides, thereby reducing the need for setting drivers, and reducing the structural complexity and the requirement for matching accuracy; the rotary driver can be a rotary motor, or as Figure 2 、 4 shown, it includes a worm 17 and a turbine 18 which are connected with each other. The turbine is installed at the end of the rotary shaft 13, and the worm can be connected with the rotary motor or can be connected with a hand-held crank 20 through a rocker 19, thereby driving the worm to rotate electrically or manually, and then driving the rotary shaft to rotate by the cooperation of the worm and the turbine. Its structure is simple but the work is accurate and stable, and the operation is extremely convenient and fast.

Claims

1. A film wrapping machine oven structure, comprising side air duct plates (2) respectively arranged on both sides inside the box body (1), characterized in that: There are several intermediate air duct plates (3) for separating spaces arranged at intervals between the two side air duct plates. The interiors of the side air duct plates and the intermediate air duct plates are hollow. A number of air blowing holes communicating with the interior are respectively opened on the inner side of the side air duct plates and both sides of the intermediate air duct plates. The side air duct plates and the intermediate air duct plates are also respectively connected to a hot air blower (5) for supplying hot air through air inlet pipes (4); A movable slider (6) and a transverse drive (7) for driving the slider to move are installed on the box body, and the moving direction of the slider is perpendicular to the channel direction. A transmission frame (8) connecting the slider and moving with the slider is arranged on the side air duct plate; An upper gear (9), a lower gear (10), a lifting swing arm (11) and a rotating swing arm (12) are also installed on the box body at a position opposite to the end of the intermediate air duct plate. The upper gear is arranged above the lower gear and meshes with each other. One end of the upper gear is coaxial with the lifting swing arm and is installed on a rotating shaft (13). The rotating shaft is connected to a rotating drive for driving it to rotate. The other end of the lifting swing arm is hinged to the end of the intermediate air duct plate. One end of the rotating swing arm is connected to the lower gear through a connecting shaft (14). A rotating groove is also arranged on the rotating swing arm. A sliding pin (15) is installed at the end of the intermediate air duct plate. The end of the sliding pin is located in the rotating groove and slides relatively along the rotating groove.

2. The film wrapping machine oven structure according to claim 1, characterized in that: Below the channel separated by the side air duct plate (2) and the intermediate air duct plate in the box body (1), a bottom air duct plate (16) is installed. The bottom air duct plate is hollow and several air blowing holes are opened on the top surface. The side air duct plate, the intermediate air duct plate and the bottom air duct plate are respectively connected to different hot air blowers (5) through different air inlet pipes (4).

3. The film wrapping machine oven structure according to claim 2, characterized in that: The bottom air duct plate (16) includes several sub-air duct plates arranged in sequence along the channel direction, and each sub-air duct plate is respectively connected to a different hot air blower (5).

4. The film wrapping machine oven structure according to claim 1, 2 or 3, characterized in that: The hot air blower (5) includes a heating box (51) with heating pipes arranged inside and a blower (52) connected to the air inlet of the heating box. The air outlet of the heating box is connected to the air inlet pipe (4); Along the direction from the air inlet to the air outlet in the heating box, fin heating pipes (53) and ordinary heating pipes (54) are arranged at intervals in a staggered manner. Several fins are arranged on the outer wall of the fin heating pipes.

5. The film wrapping machine oven structure according to claim 4, characterized in that: The blower (52) is installed on the box body (1). An air return opening is opened on the box body opposite to the channel and is communicated with the air inlet of the blower.

6. The film wrapping machine oven structure according to claim 4, characterized in that: Air volume regulating devices for controlling the air volume are respectively arranged between the side air duct plate (2) and the intermediate air duct plate (3) and the corresponding air inlet pipes (4); The air volume regulating device includes a wind blocking piece (55) arranged in the air outlet of the heating box (51) and a rotatable adjusting rod (56). One end of the adjusting rod is connected to the wind blocking piece; There is also a fixed adjusting plate (57). The other end of the adjusting rod (56) passes through the adjusting plate and is connected to an indicating rod (58), and indicating marks are arranged at positions opposite to the rotation stroke range of the adjusting plate and the indicating rod.

7. The film wrapping machine oven structure according to claim 2 or 3, characterized in that: An air volume regulating device for controlling the air volume is provided between the bottom air duct plate (16) and the corresponding air inlet pipe (4); the air volume regulating device includes a plurality of air hole plates (61) arranged on the top surface of the bottom air duct plate, air holes opposite to the blowing holes of the bottom air duct plate are formed on the air hole plates, a plurality of long strip holes (62) are further formed on the air hole plates along the channel direction, bolts (63) are fixed to the bottom air duct plate through the long strip holes, racks (64) are arranged at the ends of the air hole plates, and there is also a rotatable air volume control rod (65), one end of the air volume control rod is provided with a gear (66), and the gear meshes with the rack.

8. The film wrapping machine oven structure according to claim 1, 2 or 3, characterized in that: The transverse movement driver (7) is a lead screw, the axial direction of the lead screw is perpendicular to the channel direction, and the slider (6) is a sliding nut installed on the lead screw; the transmission frame (8) is U-shaped, the inner side of the U-shape of the transmission frame is sleeved outside the slider (6), sliding grooves (81) are formed on both sides of the U-shape of the transmission frame along the channel direction, and sliding columns (60) extending into the sliding grooves are arranged on the slider.

9. The film wrapping machine oven structure according to claim 1, characterized in that: A rotary driver is arranged at one side edge of the middle air duct plate (3), and both ends of the rotary shaft (13) are respectively connected to the upper gears (9) and the lifting swing arms (11) on both sides.

10. The film wrapping machine oven structure according to claim 1 or 9, characterized in that: The rotary driver includes a worm (17) and a turbine (18) connected to each other, the turbine is installed at the end of the rotary shaft (13), and the worm is connected to a hand-held crank (20) through a rocker (19).

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