Longitudinal sealing mechanism of multi-column strip bag back sealing packaging machine

Abstract

A longitudinal sealing mechanism of a multi-row strip bag back sealing packaging machine comprises a collar turning device, a front longitudinal sealing mold and a rear longitudinal sealing mold, the collar turning device and the rear longitudinal sealing mold are fixed on a machine body of the packaging machine, and the longitudinal sealing mechanism is characterized in that the front longitudinal sealing mold comprises a cross beam and a plurality of pressing blocks evenly distributed on the inner side of the cross beam; the pressing blocks are obliquely mounted on the inner side of the cross beam and are in one-to-one correspondence with the oblique pressing surfaces on the outer sides of the forming holes; opening and closing air cylinders are symmetrically arranged on the inner side of the machine body, and one end of a piston rod of each opening and closing air cylinder is connected with two symmetrically-arranged supporting bases through a connecting plate and at least two sets of guiding assemblies. A driving shaft driven by a servo motor is arranged on the inner side of the machine body, eccentric shafts are rotatably installed in the two supporting seats respectively, the two ends of the driving shaft are in transmission connection with the corresponding eccentric shafts through double-crank mechanisms respectively, and the two ends of the cross beam are connected to eccentric sections of the eccentric shafts respectively. The longitudinal sealing device has the advantages of being stable in action, small in amplitude, even in sealing pressure and good in longitudinal sealing performance.

Description

Technical Field

[0001] The utility model belongs to packaging machinery, in particular to a longitudinal sealing mechanism of a multi-row strip bag back-sealing packaging machine. Background Art

[0002] The multi-row strip bag back-seal packaging machine usually includes an unwinding mechanism, a feeding mechanism, a longitudinal cutting mechanism, a longitudinal sealing mechanism, a transverse sealing mechanism and a punching mechanism, and is widely used in strip bag packaging of various foods or medicines.

[0003] The existing longitudinal sealing mechanism is mainly composed of a cylinder, a guide column, a linear bearing, a rear crossbeam, a front crossbeam, a longitudinal sealing front mold, a rectangular spring, a longitudinal sealing forming mold, a heating tube, a collar turner, etc. After heating, the temperature of the two longitudinal sealing molds will be displayed on the temperature control meter. If the temperature is found to be inappropriate, the temperature on the temperature control meter can be adjusted respectively. During operation, the longitudinal sealing front mold is driven by the cylinder to move back and forth. The film is formed by the collar turner and then pressed together with the longitudinal sealing forming mold by the longitudinal sealing front mold to form a longitudinal sealing belt. This type of longitudinal sealing mechanism is mainly driven by a cylinder, with high gas consumption and low action frequency. The overall sealing effect is affected by the fluctuation of compressed air, and the sealing center of the strip bag is not pressed firmly, resulting in a lower qualified rate of finished bags. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a longitudinal sealing mechanism of a multi-row strip bag back-sealing packaging machine with stable action, small amplitude, uniform sealing pressure and good longitudinal sealing performance.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A longitudinal sealing mechanism of a multi-row strip bag back-sealing packaging machine comprises a collar turner, a front longitudinal sealing mold and a rear longitudinal sealing mold, wherein the collar turner and the rear longitudinal sealing mold are arranged and fixed on the body of the packaging machine from top to bottom, and the central tube of the collar turner is respectively inserted into the corresponding forming holes on the rear longitudinal sealing mold, wherein the front longitudinal sealing mold comprises a cross beam and a plurality of pressing blocks evenly installed on the inner side of the cross beam, wherein the pressing blocks are obliquely installed on the inner side of the cross beam and correspond one by one to the inclined pressing surface on the outer side of each forming hole;

[0007] An opening and closing cylinder is symmetrically arranged inside the machine body, and one end of the piston rod of the opening and closing cylinder is connected to two symmetrically arranged support seats through a connecting plate and at least two sets of guide components, which is used to drive the front longitudinal sealing mold away from the packaging material when the machine is shut down or overhauled;

[0008] A driving shaft driven by a servo motor is provided on the inside of the body, and eccentric shafts are rotatably installed in two support seats. Both ends of the driving shaft are connected to the corresponding eccentric shafts through a double crank mechanism, and both ends of the crossbeam are connected to the eccentric section of the eccentric shaft through a connecting seat, so as to drive the front longitudinal sealing mold to make an arc curve motion along the eccentricity of the eccentric shaft to achieve sealing of the packaging material.

[0009] As a further preference, the rear longitudinal sealing mold includes a rear template, on which are evenly distributed a number of semicircular molding grooves, and a left sealing plate and a right sealing plate are respectively provided on both sides of each molding groove, the left sealing plate and the right sealing plate form a complete molding hole with the molding groove of the rear template, and the inclined pressing surface is provided on the left sealing plate; a strip gap is provided between the left sealing plate and the right sealing plate, which is used to lead out the sealing edge of the packaging material and lean against the inclined pressing surface.

[0010] As a further preference, the angle between the inclined pressing surface and the rear template is 45 degrees.

[0011] As a further preference, two connecting rods are respectively provided on the crossbeam corresponding to each pressure block, the pressure block is fixed at the corresponding front end of the two connecting rods, a pressure spring, a limit sleeve and a positioning sleeve are sequentially sleeved on the connecting rod, and two adjusting nuts are respectively provided on the outside of the positioning sleeve, for realizing elastic compression between the pressure block and the inclined pressing surface.

[0012] As a further preference, the two sides of the cross beam are staggered and serrated to facilitate the installation of connecting rods and pressure blocks.

[0013] As a further preference, the guide assembly includes a guide column and a guide sleeve, wherein the guide sleeve is fixed on the body of the packaging machine, the guide column is installed in the guide sleeve through a linear bearing, and one end of the guide column is fixedly connected to one end of the connecting plate, and the other end is fixedly connected to the corresponding support seat.

[0014] As a further preference, the servo motor is fixed in the machine body through a motor seat, and is transmission-connected to the driving shaft through a synchronous belt mechanism; the two ends and the middle of the driving shaft are respectively installed in the machine body through bearing seats and bearings.

[0015] As a further preference, three proximity switches are installed on the bearing seat in the middle of the driving shaft through an arc-shaped support plate, and three sleeves are fixed axially in the middle of the driving shaft. A trigger screw is provided on each sleeve, and the trigger screws correspond to the proximity switches one by one, respectively, and are used to adjust and limit the rotation angle of the driving shaft, thereby limiting the movement amplitude of the front longitudinal sealing mold.

[0016] As a further preference, the cranks at both ends of the double crank mechanism are of equal length and are arranged vertically in space, and the crank at the front end is clamped in the middle of the corresponding eccentric shaft.

[0017] As a further preference, the connecting seat is formed by two connecting plates arranged in parallel and connected by a vertical plate, wherein the two connecting plates are respectively installed on the eccentric sections at both ends of the eccentric shaft through bearings; the two ends of the crossbeam are respectively inserted and fixed between the two connecting plates of the connecting seat.

[0018] As a further preference, electric heating tubes are respectively inserted into the pressing blocks for heating the pressing blocks to achieve heat sealing.

[0019] The beneficial effects of the utility model are:

[0020] 1. The servo motor drives the active shaft to rotate through the double crank mechanism, and the two ends of the crossbeam of the front longitudinal sealing mold are connected to the eccentric section of the eccentric shaft through the connecting seat, so that the front longitudinal sealing mold can be driven to move in an arc curve along the eccentricity of the eccentric shaft. At the same time, the pressing block is installed obliquely on the inner side of the crossbeam and corresponds to the inclined pressing surface on the outer side of each forming hole one by one; therefore, the packaging material can be sealed by the cooperation of the pressing block and the inclined pressing surface; the action is stable, the amplitude is small, the working noise is small, and the efficiency is high; the sealing pressure is uniform, the sealing center of the strip bag can be compacted, and the longitudinal sealing is good; the qualified rate of the finished bag is high.

[0021] 2. Since an opening and closing cylinder is symmetrically arranged on the inner side of the machine body, one end of the piston rod of the opening and closing cylinder is connected to two symmetrically arranged support seats through a connecting plate and at least two sets of guide components. Therefore, when the machine is shut down or overhauled, the front longitudinal sealing mold connected between the two support seats can be driven to move forward by retracting the piston rod through the opening and closing cylinder, thereby leaving the working area and away from the packaging material to prevent the packaging material from being deformed by heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the front view of the utility model.

[0023] Figure 2 yes Figure 1 Top view of the .

[0024] Figure 3 yes Figure 1 Left view of .

[0025] Figure 4 yes Figure 1 AA section view.

[0026] Figure 5 yes Figure 1 BB cross-sectional view.

[0027] Figure 6 yes Figure 1 CC cross-sectional view.

[0028] Figure 7 It is a stereogram of the utility model.

[0029] Figure 8 yes Figure 6 A partial enlarged view of .

[0030] In the figure: body 1, rear longitudinal sealing mold 2, forming hole 201, front longitudinal sealing mold 3, collar turner 4, connecting seat 5, supporting seat 6, double crank mechanism 7, guide assembly 8, opening and closing cylinder 9, connecting plate 10, bearing seat 11, driving shaft 12, servo motor 13, proximity switch 14, arc support plate 15, synchronous belt mechanism 16, jacket 17, crossbeam 18, rear template 19, eccentric shaft 20, plate frame 21, positioning sleeve 22, limit sleeve 23, pressure spring 24, connecting rod 25, pressing block 26, electric heating tube 27, right sealing plate 28, left sealing plate 29, inclined pressing surface 291, motor seat 30. DETAILED DESCRIPTION

[0031] like Figure 1-Figure 8 As shown, the utility model relates to a longitudinal sealing mechanism of a multi-row strip bag back-sealing packaging machine, comprising a collar turner 4, a front longitudinal sealing mold 3 and a rear longitudinal sealing mold 2, the collar turner 4 and the rear longitudinal sealing mold 2 are arranged and fixed on the body 1 of the packaging machine up and down, a plurality of forming holes 201 are evenly distributed on the rear longitudinal sealing mold 2, and the central tube 401 of the collar turner 4 is respectively inserted into the corresponding forming holes 201 on the rear longitudinal sealing mold 2.

[0032] The rear longitudinal sealing mold 2 includes a rear template 19, which is fixedly connected to the front of the body 1 through a plurality of plate frames 21. A plurality of semicircular forming grooves are evenly distributed in front of the rear template 19, and a left sealing plate 29 and a right sealing plate 28 are respectively fixed by screws on both sides of each forming groove. The left sealing plate 29 and the right sealing plate 28 form a complete forming hole 201 with the forming groove of the rear template 19. An inclined pressing surface 291 is provided on the left sealing plate 29, and the angle between the inclined pressing surface and the rear template 19 is 45 degrees; a strip gap is provided between the left sealing plate 29 and the right sealing plate 28, which is used to lead out the sealing edge of the packaging material and lean against the inclined pressing surface 291.

[0033] The front longitudinal sealing mold 3 includes a cross beam 18 and a plurality of pressure blocks 26 evenly installed on the inner side of the cross beam. The pressure blocks 26 are obliquely installed on the inner side of the cross beam 18 and correspond to the oblique pressing surfaces on the outer side of each forming hole 201. Two connecting rods 25 arranged up and down are respectively passed through the cross beam 18 corresponding to each pressure block 26. The front ends of the two connecting rods 25 are respectively inserted into the pressure blocks 26 and fixed to the pressure blocks 26 through the top screw. The connecting rods 25 are sequentially sleeved in the cross beam 18 with a pressure spring 24, a limiting sleeve 23 and a positioning sleeve 22, and two adjusting nuts are respectively provided on the outer side of the positioning sleeve 22 to realize the elastic compression of the pressure block 26 and the oblique pressing surface, and to facilitate the adjustment of the preload force of the pressure spring 24. The two sides of the cross beam 18 are serrated and arranged in a staggered manner to facilitate the installation of the connecting rods 25 and the pressure blocks 26.

[0034] Insert holes are respectively provided on one side of the pressing block 26 close to the inclined pressing surface and are inserted with electric heating tubes 27 for heating the pressing block 26 to achieve heat sealing.

[0035] Two horizontally arranged opening and closing cylinders 9 are symmetrically fixed on the inner side of the machine body 1. One end of the piston rod of the opening and closing cylinder 9 is connected to two symmetrically arranged support seats 6 through a connecting plate 10 and at least two groups of guide components 8. The two support seats 6 are located on the left and right sides of the rear longitudinal sealing mold 2 and are connected to the front longitudinal sealing mold 3 through an eccentric shaft 20 provided thereon, and are used for driving the front longitudinal sealing mold 3 away from the packaging material when shutting down or overhauling.

[0036] This embodiment takes four groups of guide assemblies 8 as an example, each group of guide assemblies 8 includes a guide column 802 and a guide sleeve 801, wherein the guide sleeve is fixed on the body 1 of the packaging machine, the guide column is installed in the guide sleeve through a linear bearing, and one end of the guide column is fixedly connected to one end of the connecting plate 10, and the other end is fixedly connected to the corresponding support seat 6.

[0037] A driving shaft 12 driven by a servo motor 13 is provided inside the machine body 1. The servo motor 13 is fixed to the top plate (not shown) in the machine body 1 through a motor seat 30, and is connected to the driving shaft 12 through a synchronous belt mechanism 16; the two ends and the middle of the driving shaft 12 are respectively installed on the top plate in the machine body 1 through a bearing seat 11 and a bearing. The eccentric shaft 20 is rotatably installed in the two support seats 6 in the vertical direction through bearings, and the two ends of the driving shaft 12 are respectively connected to the corresponding eccentric shaft 20 through a double crank mechanism 7. The two ends of the crossbeam 18 are respectively connected to the eccentric section of the eccentric shaft 20 through a connecting seat 5, which is used to drive the front longitudinal sealing mold 3 to move in an arc curve along the eccentricity of the eccentric shaft 20 to achieve sealing of the packaging material.

[0038] The cranks at both ends of the double crank mechanism 7 are of equal length and are arranged vertically in space, wherein the front crank 701 is sleeved and clamped in the middle of the corresponding eccentric shaft 20, and the middle connecting rod passes through the through hole on the body 1. The connecting seat 5 is formed by two parallel connecting plates 501 connected by vertical plates 502 and screws, wherein the two connecting plates are respectively installed on the eccentric sections at both ends of the eccentric shaft 20 through bearings; the two ends of the crossbeam 18 are respectively inserted and fixed between the two connecting plates of the connecting seat 5.

[0039] Three staggered proximity switches 14 are installed on the bearing seat 11 in the middle of the driving shaft 12 through an arc support plate 15, and three sleeves 17 are fixed axially in the middle of the driving shaft 12. A trigger screw is provided on each sleeve 17, and the trigger screws correspond to the proximity switches 14 one by one. The signal output end of the proximity switch 14 is electrically connected to the controller of the packaging machine, and is used to adjust and limit the rotation angle of the driving shaft 12 by controlling the servo motor 13, thereby limiting the movement amplitude of the front longitudinal sealing mold 3.

[0040] When working, the specific steps are as follows:

[0041] 1. The electric heating tube 27 is connected to an external power source to heat the pressing block 26, and the multiple strips of packaging materials to be longitudinally sealed are respectively passed through the collar turning device 4 and automatically rolled into a cylindrical shape and inserted into the forming hole of the rear longitudinal sealing mold 2 along the central tube of the collar turning device 4; at the same time, the sealing edge of the packaging material is led out from the strip gap between the left sealing plate 29 and the right sealing plate 28;

[0042] 2. The servo motor 13 is started by the controller of the packaging machine, and the driving shaft 12 is driven to rotate by the synchronous belt mechanism 16. When rotating, the proximity switches 14 located on both sides are triggered by the trigger screws on two of the jackets 17, so that the servo motor 13 can be controlled to reverse, thereby controlling the driving shaft 12 to reciprocate within a small angle range;

[0043] 3. When the driving shaft 12 reciprocates, the double crank mechanism 7 drives the eccentric shaft to reciprocate. When the eccentric shaft reciprocates, the eccentric section and the connecting seat 5 drive the front longitudinal sealing mold 3 to move in an arc curve along the eccentricity of the eccentric shaft, thereby driving the pressing block 26 to press the sealing edge on the corresponding inclined pressing surface in turn, so as to realize longitudinal heat sealing of the packaging material; the longitudinally sealed packaging material is pulled out between the front longitudinal sealing mold 3 and the rear longitudinal sealing mold 2 by the horizontal sealing mechanism below;

[0044] 4. When the machine is shut down or overhauled, the controller controls the opening and closing cylinder 9 to retract the piston rod, and the guide assembly 8 can drive the front longitudinal sealing mold 3 connected between the two support seats 6 to move forward, so that the pressing block 26 is separated from the working area and away from the packaging material to prevent the packaging material from being deformed by heat.

[0045] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A longitudinal sealing mechanism of a multi-row strip bag back-sealing packaging machine, comprising a collar turner, a front longitudinal sealing mold and a rear longitudinal sealing mold, wherein the collar turner and the rear longitudinal sealing mold are arranged and fixed on the body of the packaging machine in an upper and lower manner, and the central tube of the collar turner is respectively inserted into the corresponding forming hole on the rear longitudinal sealing mold, wherein the characteristics are: The front longitudinal sealing mold includes a crossbeam and a plurality of pressing blocks evenly installed on the inner side of the crossbeam, wherein the pressing blocks are obliquely installed on the inner side of the crossbeam and correspond one by one to the inclined pressing surface on the outer side of each forming hole; An opening and closing cylinder is symmetrically arranged inside the machine body, and one end of the piston rod of the opening and closing cylinder is connected to two symmetrically arranged support seats through a connecting plate and at least two sets of guide components, which is used to drive the front longitudinal sealing mold away from the packaging material when the machine is shut down or overhauled; A driving shaft driven by a servo motor is provided on the inside of the body, and eccentric shafts are rotatably installed in two support seats. Both ends of the driving shaft are connected to the corresponding eccentric shafts through a double crank mechanism, and both ends of the crossbeam are connected to the eccentric section of the eccentric shaft through a connecting seat, so as to drive the front longitudinal sealing mold to make an arc curve motion along the eccentricity of the eccentric shaft to achieve sealing of the packaging material.

2. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1 is characterized by: The rear longitudinal sealing mold includes a rear template, on which a number of semicircular molding grooves are evenly distributed, and a left sealing plate and a right sealing plate are respectively provided on both sides of each molding groove. The left sealing plate and the right sealing plate form a complete molding hole with the molding groove of the rear template, and the inclined pressing surface is arranged on the left sealing plate; a strip gap is provided between the left sealing plate and the right sealing plate, which is used to lead out the sealing edge of the packaging material and lean against the inclined pressing surface.

3. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 2 is characterized by: The angle between the inclined pressing surface and the rear template is 45 degrees.

4. The longitudinal sealing mechanism of the multi-row strip bag back-sealing packaging machine according to claim 1 is characterized in that: Two connecting rods are respectively provided on the crossbeam corresponding to each pressure block, and the pressure block is fixed at the front end of the corresponding two connecting rods. A pressure spring, a limit sleeve and a positioning sleeve are sequentially sleeved on the connecting rod, and two adjusting nuts are respectively provided on the outside of the positioning sleeve to achieve elastic compression between the pressure block and the inclined pressing surface.

5. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1 or 4, characterized in that: The two sides of the cross beam are in a staggered serration shape to facilitate the installation of the connecting rod and the pressure block.

6. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1 is characterized by: The guide assembly includes a guide column and a guide sleeve, wherein the guide sleeve is fixed on the body of the packaging machine, the guide column is installed in the guide sleeve through a linear bearing, and one end of the guide column is fixedly connected to one end of the connecting plate, and the other end is fixedly connected to the corresponding support seat.

7. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1 is characterized by: The servo motor is fixed in the machine body through a motor seat and is connected to the driving shaft through a synchronous belt mechanism; the two ends and the middle of the driving shaft are respectively installed in the machine body through a bearing seat and a bearing.

8. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1 or 7, characterized in that: Three proximity switches are installed on the bearing seat in the middle of the driving shaft through an arc-shaped support plate. Three sleeves are fixed axially in the middle of the driving shaft. Each sleeve is provided with a trigger screw. The trigger screws correspond to the proximity switches one by one and are used to adjust and limit the rotation angle of the driving shaft, thereby limiting the movement range of the front longitudinal sealing mold.

9. The longitudinal sealing mechanism of the multi-row strip bag back-seal packaging machine according to claim 1, characterized in that: The cranks at both ends of the double crank mechanism are of equal length and are arranged vertically in space, and the crank at the front end is clamped in the middle of the corresponding eccentric shaft.

10. A longitudinal sealing mechanism of a multi-row strip bag back-seal packaging machine according to claim 1 or 9, characterized in that: The connecting seat is formed by two connecting plates arranged in parallel connected by a vertical plate, wherein the two connecting plates are respectively installed on the eccentric sections at both ends of the eccentric shaft through bearings; the two ends of the crossbeam are respectively inserted and fixed between the two connecting plates of the connecting seat.

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