Multi-column carton double-transverse-sealing mechanism and double-transverse-sealing method

Abstract

The multi-column carton double-transverse-sealing mechanism comprises a first transverse-sealing module and a second transverse-sealing module which are vertically parallel and used for conducting first transverse sealing and second transverse sealing on cartons respectively, and each transverse-sealing module comprises a lifting driving assembly, a mounting frame, a front heat-sealing assembly, a rear heat-sealing assembly and a transverse-sealing driving assembly; the mounting frame is connected with the lifting driving assembly, the transverse sealing driving assembly comprises a first driving motor, a ball spline structure and a connecting rod structure, the ball spline structure comprises a spline shaft and an outer cylinder sleeve part, the outer cylinder sleeve part is mounted on the mounting frame, the first driving motor is in driving connection with the spline shaft, and the outer cylinder sleeve part and the mounting frame can ascend and descend along the spline shaft; the outer cylinder sleeve piece is connected with at least one of the front transverse sealing frame and the rear transverse sealing frame through a connecting rod structure. The two sets of transverse seals can improve the sealing performance of the transverse seals, the speed of the transverse seals and the quality of the transverse seals, the transverse seal driving structure can relieve the lifting load, it is guaranteed that heat seal stress is even, the heat seal quality is improved, and the synchronous transverse seal device is suitable for synchronous transverse seal of multiple rows of strip packages.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging equipment, and in particular to a double transverse sealing mechanism and a double transverse sealing method for multi-row strip packages. Background Art

[0002] Strip bagging machines are mainly used for packaging granules, powders and liquid materials. The main processes include conveying packaging film, strip bag forming, sealing the longitudinal edges of strip bags, sealing the transverse edges of strip bags, filling materials, dividing strip bags, cutting easy-tear edges and rejecting defective products. Strip bagging machines can package single-row strip bags at a time, or produce multiple-row strip bags at a time. Multiple-row strip bagging machines are suitable for the production of small-volume strip bags. When packaging multiple-row strip bags at the same time, it is necessary to consider the uniformity of the force on each strip bag to avoid various problems caused by uneven force, such as excessive force on the edge strip bags and insufficient force on the middle strip bags. For the transverse sealing mechanism of multiple-row strip bags, it is mainly to seal the strip bags transversely during the strip bag forming process. Generally, heat sealing is used. The front and rear hot-stamping blocks are clamped together to seal. The subsequent punching mechanism cuts at the seal to separate the front and rear strip bags. However, the existing transverse sealing mechanisms often have problems such as poor sealing effect and too low transverse sealing speed. In particular, for the production of multiple rows of strip bags, when pressure needs to be applied to multiple rows of strip bags for heat sealing at the same time, uneven force is often applied to the strip bags, resulting in some strip bags (such as the strip bags in the middle position) being subjected to too little force, incomplete heat sealing, and poor sealing of the strip bags. Since the strip bags need to be pulled during the transverse sealing process to move one station, if the clamping force between the front and rear hot stamping blocks is insufficient, the strip bag pulling process may fail, affecting the transverse sealing effect and subsequent processes. For strip bags subjected to excessive force, the transverse sealing of the strip bags may be damaged. For example, excessive hot stamping may cause deformation of the heat-sealing film, or even damage the heat-sealing film to damage the strip bags, affecting the quality of the final product. The existing strip bag mechanism is generally in the form of a single horizontal seal, in which only one horizontal seal is performed on the strip bag. After the single horizontal seal pulls the film downward to the right position, it needs to return upward and then pull the film again. During the upward return process, the strip bag film cannot continue to move downward, resulting in a pause in the strip bag packaging process, affecting production efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a double horizontal sealing mechanism for multi-row strip packages that can perform two-pass horizontal sealing, can alternately seal and pull the film without stopping, and has good horizontal sealing quality, as well as a method for double horizontal sealing using the horizontal sealing mechanism.

[0004] The present invention is achieved through the following technical solutions:

[0005] A multi-row strip bag double transverse sealing mechanism comprises a frame and a first transverse sealing module and a second transverse sealing module arranged on the frame in sequence from top to bottom, and the first transverse sealing module and the second transverse sealing module are parallel to each other up and down, and are respectively used for performing a first transverse sealing and a second transverse sealing on the strip bag; the first transverse sealing module and the second transverse sealing module have the same structure, both comprising a lifting drive assembly, a mounting frame, a front heat sealing assembly, a rear heat sealing assembly and a transverse sealing drive assembly, and the positions of the lifting drive assembly, the mounting frame, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly on the first transverse sealing module and the second transverse sealing module are respectively opposite to each other, that is, the positions of the lifting drive assembly, the mounting frame, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly on the first transverse sealing module are opposite to the positions of the lifting drive assembly, the mounting frame, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly on the second transverse sealing module.

[0006] The lifting drive assembly is mounted on the frame, and the front heat sealing assembly and the rear heat sealing assembly are relatively mounted on the mounting frame, and the mounting frame is connected to the lifting drive assembly, and the mounting frame is lifted and lowered along the frame under the drive of the lifting drive assembly, driving the front heat sealing assembly and the rear heat sealing assembly to lift and lower together, thereby pulling a section of film strip downward; the front heat sealing assembly includes a front transverse sealing frame and a plurality of front heat sealing blocks arranged side by side on the front transverse sealing frame, and the rear heat sealing assembly includes a rear transverse sealing frame and a plurality of rear heat sealing blocks arranged side by side on the rear transverse sealing frame, and the transverse sealing drive assembly includes a first driving motor, a ball spline structure, and a connecting rod structure, the first driving motor is mounted on the frame, and the ball spline structure includes a spline shaft and an outer cylinder kit sleeved on the spline shaft and capable of linear and rotational motion, The spline shaft is vertically arranged on the frame, and the outer cylinder kit is installed on the mounting frame. The first driving motor is connected to the spline shaft to drive the spline shaft to rotate, and the outer cylinder kit and the mounting frame can be raised and lowered along the spline shaft while driving the outer cylinder kit to rotate; the front transverse sealing frame and the rear transverse sealing frame are arranged opposite to each other, the number of front heat sealing blocks and the rear heat sealing blocks are equal, and the positions are relative to each other so that the front heat sealing blocks and the rear heat sealing blocks can cooperate with each other to clamp the strip package and perform transverse sealing on the strip package, and the outer cylinder kit is connected to at least one of the front transverse sealing frame and the rear transverse sealing frame through the connecting rod structure. The rotation of the outer cylinder kit drives at least one of the front transverse sealing frame and the rear transverse sealing frame to move linearly through the connecting rod structure, so that the front transverse sealing frame and the rear transverse sealing frame are close to or away from each other, thereby making the front heat sealing block and the rear heat sealing block close to each other to perform transverse sealing on the strip package.

[0007] Furthermore, the heat-sealing surfaces of the front heat-sealing block and the rear heat-sealing block on the first transverse sealing module are both longitudinal-grained structures, which are used to heat-seal longitudinal grains on the strip pack; the heat-sealing surfaces of the front heat-sealing block and the rear heat-sealing block on the second transverse sealing module are both transverse-grained structures, which are used to heat-seal transverse grains on the strip pack at positions adjacent to the longitudinal grains heat-sealed by the first transverse sealing module, and the combination of longitudinal grains and transverse grains can enhance the sealing performance. The first transverse sealing module and the second transverse sealing module work together to pull the strip pack downward, which can increase the production speed.

[0008] Furthermore, a guide hole is provided on the mounting frame, a guide rod is passed through the guide hole, the guide rod can slide along the guide hole, both ends of the guide rod pass through the guide hole, namely a first end and a second end, the front transverse sealing frame is fixed on the first end of the guide rod, the rear transverse sealing frame can be slidably installed on the guide rod and is located between the mounting frame and the front transverse sealing frame, and a linkage frame is fixed on the second end of the guide rod; the connecting rod structure includes a first connecting rod structure and a second connecting rod structure, the outer tube kit is connected to the rear transverse sealing frame through the second connecting rod structure, the outer tube kit is connected to the linkage frame through the first connecting rod structure, and the linkage frame pushes the front transverse sealing frame to move through the guide rod.

[0009] Further, the first link structure includes a first link and a second link, one end of the first link is fixedly connected to the outer tube kit, and the other end is hinged to one end of the second link, and the other end of the second link is hinged to the linkage frame; the second link structure includes a third link and a fourth link, one end of the third link is fixedly connected to the outer tube kit, and the other end is hinged to one end of the fourth link, and the other end of the fourth link is hinged to the rear transverse sealing frame; the first link and the third link are located in a straight line.

[0010] Furthermore, the first drive motor is drivingly connected to the spline shaft through a third connecting rod structure, and the third connecting rod structure includes a fifth connecting rod and a sixth connecting rod, one end of the fifth connecting rod is connected to the first drive motor, and the other end is hinged to one end of the sixth connecting rod, and the other end of the sixth connecting rod is fixedly connected to the spline shaft.

[0011] Furthermore, the transverse sealing drive components have two groups arranged in parallel, and the two groups of transverse sealing drive components jointly drive the front heat sealing component and the rear heat sealing component to move closer to or away from each other.

[0012] Furthermore, the lifting drive assembly includes a second servo motor, a transmission shaft, a driving wheel, a driven wheel and a toothed belt. The second servo motor is installed on the frame, the transmission shaft is horizontally installed on the frame, the second servo motor is connected to the transmission shaft, the driving wheel is installed on the transmission shaft and rotates with the transmission shaft, the toothed belt is wrapped around the driving wheel and the driven wheel in the vertical direction, the mounting frame is fixed on the toothed belt, the second servo motor drives the driving wheel to rotate through the transmission shaft, and the driving wheel drives the toothed belt to move, thereby driving the mounting frame and the front heat sealing assembly and the rear heat sealing assembly thereon to lift and lower, so that the strip bag can be pulled downward while performing horizontal sealing.

[0013] Furthermore, a slider is provided on the mounting frame, and a slide rail is provided on the frame accordingly, and the mounting frame can be lifted and lowered along the frame through the cooperation between the slider and the slide rail. The driven wheel on the first transverse sealing module is rotatably mounted on the transmission shaft on the second transverse sealing module through a bearing; the same lifting drive assembly includes two sets of parallel driving wheels, driven wheels and toothed belts, and the mounting frame is fixed on the two sets of toothed belts.

[0014] A multi-row strip package double transverse sealing method, using the multi-row strip package double transverse sealing mechanism, comprises the following steps:

[0015] S1. The mounting frame of the first transverse sealing module moves downward under the drive of the lifting drive assembly, and in the process of driving the front heat sealing assembly and the rear heat sealing assembly to move downward, the front heat sealing block and the rear heat sealing block on the first transverse sealing module are driven by the transverse sealing drive assembly to approach each other and clamp the first strip package, and then pull the strip package downward for a length L1, and perform the first transverse seal on the first strip package at the same time, that is, the first transverse seal is performed synchronously in the process of pulling the strip package downward, and the heat sealing time must match the distance and speed of the pulling strip package; in this process, the mounting frame of the second transverse sealing module moves upward to a distance L2 under the drive of the lifting drive assembly and then stops moving upward.

[0016] S2, the mounting frame of the second transverse sealing module moves downward under the drive of the lifting drive assembly, driving the front heat sealing assembly and the rear heat sealing assembly to move downward. During this process, the front heat sealing block and the rear heat sealing block on the second transverse sealing module approach each other and clamp the Nth package under the drive of the transverse sealing drive assembly. Then, the first transverse sealing module releases the first package (that is, its front heat sealing block and the rear heat sealing block move away from each other under the drive of the transverse sealing drive assembly), and the first transverse sealing module starts to rise back to its original position. During this process, the second transverse sealing module pulls the package downward for a length L2, and at the same time The second transverse seal is performed at the position of the first transverse seal of the Nth bag, that is, the second transverse seal is performed synchronously in the process of pulling the bag downward, and the heat sealing time must match the distance and speed of the pulling bag; when the first transverse seal module clamps the next bag (that is, the next bag to be sealed next to the first bag), the second transverse seal module releases the Nth bag, and then rises back to its position to complete a transverse seal of the Nth bag (vertical grain + horizontal grain, two transverse seals). The transverse seal position is the connection between the upper and lower bags, and the upper and lower bags can be cut apart by punching at the transverse seal position. At this time, the first bag has only completed the first transverse seal, and the second transverse seal module will subsequently perform the second transverse seal on the first bag.

[0017] In the above steps, the steps of clamping the strip package, pulling the strip package downwards and releasing the strip package of the first transverse sealing module or the second transverse sealing module are all completed in the process of moving downwards.

[0018] Furthermore, the sum of the length L1 of the strip package pulled by the first transverse sealing module and the length L2 of the strip package pulled by the second transverse sealing module is equal to the length L of a strip package; the speed at which the first transverse sealing module moves downward is equal to the speed at which the second transverse sealing module moves downward. The speed of returning upward can be faster than the speed of moving downward to achieve rapid return. 1<N≤10, the Nth strip package is the second strip package, the third strip package, the fourth strip package, the fifth strip package, the sixth strip package, the seventh strip package, the eighth strip package, the ninth strip package or the tenth strip package below the first strip package, that is, the strip package clamped by the second transverse sealing module is the other strip package below the first transverse sealing module, and the first transverse sealing module and the second transverse sealing module do not heat-seal the transverse sealing position of the same strip package in one transverse sealing cycle, and there are several strip packages in between. The specific number of strip packages in the interval is determined according to the length of the strip package and the size of the transverse sealing module.

[0019] The present invention arranges two groups of transverse seals to perform two transverse seals on the strip bag, thereby improving the sealing performance of the transverse seals. At the same time, the two groups of transverse seals can alternately pull the strip bag downwards, and compared with a single group of transverse seals, the time for the transverse seals to rise and return to their positions is saved, and the film can be drawn without stopping for heat sealing, thereby improving the production speed. Furthermore, the two groups of transverse seals can ensure that there is always one group of transverse seals clamping the strip bag, thereby avoiding inaccurate heat sealing positions due to shaking and twisting of the strip bag, and avoiding the contact of non-heat sealing portions with heat sealing blocks due to shaking of the strip bag, thereby improving the heat sealing quality. A ball spline structure is adopted as a driving component of the transverse seal, so that the servo driving part can be installed outside the transverse sealing functional part, and driving components such as the servo motor can be installed independently of the transverse sealing part, thereby greatly reducing the weight load of the transverse sealing part, and reducing the energy load and equipment cost. The driving assembly drives the two heat-sealing blocks to move synchronously to approach each other through a two-link structure, which can control the clamping force during heat sealing and improve the heat-sealing effect. The unique structural design of the two connecting rods, linkage frame, guide rod and two sets of punching drives makes the force on the heat-sealing blocks on the two horizontal sealing frames more uniform, avoiding various problems caused by uneven force on the heat-sealing blocks, such as some strip bags are not sufficiently stressed and the heat-sealed is not thorough, and there are still unbonded areas, some heat-sealing blocks are damaged due to excessive impact force and clamping force, destroying the strip bags, or over-heating, etc. It is suitable for heat-sealing multiple rows of strip bags at the same time; the structure and layout relationship of the lifting drive assembly and the horizontal sealing drive assembly make the overall structure of the equipment reasonable and compact, which is convenient for installation and operation on the strip bag machine and coordination with other mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0021] Figure 2 A structural schematic diagram of another perspective of an embodiment of the present invention.

[0022] Figure 3 It is a partial structural schematic diagram of the first transverse sealing module in an embodiment of the present invention.

[0023] Figure 4 Schematic diagram of another part of the structure of the first transverse sealing module in an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of an enlarged structure of part of the first transverse sealing module in an embodiment of the present invention.

[0025] Figure 6 It is a front schematic diagram of an embodiment of the present invention.

[0026] Figure 7 It is a front cross-sectional view of an embodiment of the present invention.

[0027] Figure 8 for Figure 6 Cross-sectional view along the AA direction.

[0028] Fig. 9 This is a working principle diagram of the cooperation between two transverse sealing modules in an embodiment of the present invention.

[0029] Figure markings: 1-frame; 2-first transverse sealing module; 3-second transverse sealing module; 11-slide rail; 21-lifting drive assembly; 22-mounting frame; 23-transverse sealing drive assembly; 24-front transverse sealing frame; 25-front heat sealing block; 26-rear transverse sealing frame; 27-rear heat sealing block; 28-slider; 211-second servo motor; 212-transmission shaft; 213-driving wheel; 214-toothed belt; 215-driven wheel; 231-first drive motor; 232-spline shaft; 233-outer cylinder kit; 234-first connecting rod structure; 235-second connecting rod structure; 236-linkage frame; 237-guide rod; 238-third connecting rod structure; 2341-first connecting rod; 2342-second connecting rod; 2351-third connecting rod; 2352-fourth connecting rod; 2381-fifth connecting rod; 2382-sixth connecting rod. DETAILED DESCRIPTION

[0030] A double transverse sealing mechanism for multi-row strip packages, such as Figure 1 , Figure 2 As shown, it includes a frame 1 and a first transverse sealing module 2 and a second transverse sealing module 3 arranged on the frame 1 from top to bottom, and the first transverse sealing module 2 and the second transverse sealing module 3 are parallel to each other up and down, and are respectively used to perform the first transverse sealing and the second transverse sealing on the strip package in sequence; the first transverse sealing module 2 and the second transverse sealing module 3 have the same structure. Taking the first transverse sealing module 2 as an example, as shown in FIG. Figure 3 , Figure 4 , including a lifting drive assembly 21, a mounting frame 22, a front heat sealing assembly, a rear heat sealing assembly and a transverse sealing drive assembly 23, and the positions of the lifting drive assembly 21, the mounting frame 22, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly 23 on the first transverse sealing module 2 and the second transverse sealing module 3 are respectively opposite to each other, that is, the lifting drive assembly 21, the mounting frame 22, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly 23 on the first transverse sealing module 2 are respectively opposite to the lifting drive assembly 21, the mounting frame 22, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly 23 on the second transverse sealing module 3.

[0031] The lifting drive assembly 21 is installed on the frame 1, and the front heat sealing assembly and the rear heat sealing assembly are relatively installed on the mounting frame 22. The mounting frame 22 is connected to the lifting drive assembly 21. The mounting frame 22 rises and falls under the drive of the lifting drive assembly 21, driving the front heat sealing assembly and the rear heat sealing assembly to rise and fall together, thereby pulling a section of the film strip downward; the front heat sealing assembly includes a front transverse sealing frame 24 and a plurality of front heat sealing blocks 25 arranged side by side on the front transverse sealing frame 24, and the rear heat sealing assembly includes a rear transverse sealing frame 26 and a plurality of rear heat sealing blocks 27 arranged side by side on the rear transverse sealing frame 26. The transverse sealing drive assembly 23 includes a first driving motor 231, a ball spline structure, and a connecting rod structure. The first driving motor 231 is installed on the frame 1, and the ball spline structure includes a spline shaft 232 and an outer cylinder set 233 which is sleeved on the spline shaft 232 and can perform linear motion and rotational motion. The spline shaft 232 is vertically arranged On the frame 1, the outer cylinder kit 233 is installed on the mounting frame 22, and the first driving motor 231 is connected to the spline shaft 232 to drive the spline shaft 232 to rotate, while driving the outer cylinder kit 233 to rotate, the outer cylinder kit 233 and the mounting frame 22 can be lifted and lowered along the spline shaft 232; the front transverse sealing frame 24 and the rear transverse sealing frame 26 are arranged opposite to each other, the number of the front heat sealing blocks 25 and the rear heat sealing blocks 27 are equal, and the positions are opposite to each other so that the front heat sealing blocks 25 and the rear heat sealing blocks 27 are arranged opposite to each other. The rear heat sealing block 27 can cooperate with each other to clamp the strip package and perform transverse sealing on the strip package. The outer cylinder kit 233 is connected to at least one of the front transverse sealing frame 24 and the rear transverse sealing frame 26 through the connecting rod structure. The rotation of the outer cylinder kit 233 drives at least one of the front transverse sealing frame 24 and the rear transverse sealing frame 26 to move linearly through the connecting rod structure, so that the front transverse sealing frame 24 and the rear transverse sealing frame 26 are close to or away from each other, thereby making the front heat sealing block 25 and the rear heat sealing block 27 close to each other to perform transverse sealing on the strip package.

[0032] Two transverse sealing modules are set to perform transverse sealing on the same position of the strip package to improve the sealing quality. At the same time, the two transverse seals pull the film alternately to increase the speed. As one embodiment, the heat sealing faces of the front heat sealing block 25 and the rear heat sealing block 27 on the first transverse sealing module 2 are both longitudinal grain structures, which are used to heat seal longitudinal grains on the strip package; the heat sealing faces of the front heat sealing block 25 and the rear heat sealing block 27 on the second transverse sealing module 3 are both transverse grain structures, which are used to heat seal transverse grains at positions on the strip package that are close to the longitudinal grains heat-sealed by the first transverse sealing module 2. The transverse grains and the longitudinal grains are as close as possible. The combination of the longitudinal grains and the transverse grains can enhance the sealing performance. The transverse grains are located below the longitudinal grains. After the strip package is cut, the transverse grains are located at the ends of the strip package, and the longitudinal grains are close to the middle of the strip package. The first transverse sealing module 2 and the second transverse sealing module 3 alternately pull the strip package downward, which saves the time for the transverse sealing module to rise and return to its position, and can increase the production speed. To this end, it is necessary for each component on the first transverse sealing module 2 and the second transverse sealing module 3 to operate independently.

[0033] The ball spline structure allows the first drive motor 231 to be installed on the mounting frame 22 (fixed on the frame 1). The spline shaft 232 is used to transmit power to drive the front heat sealing assembly and the rear heat sealing assembly to move linearly for heat transverse sealing. At the same time, the mounting frame 22 can drive the front heat sealing assembly and the rear heat sealing assembly to move up and down. The external arrangement of the first drive motor 231 can greatly reduce the load weight of the mounting frame 22, and can easily achieve lifting. In this embodiment, the transverse sealing drive assembly 23 has two groups arranged in parallel, and the two groups of transverse sealing drive assemblies 23 jointly drive the front heat sealing assembly and the rear heat sealing assembly to move closer or farther from each other, so as to adapt to the equipment with a large number of strip packs and make the force uniform. The strip packs in this embodiment are arranged in 12 rows in parallel. The above-mentioned ball spline structure is used as the driving component of the transverse sealing drive assembly 23, and the two first drive motors 231 can be arranged outside the mounting frame 22, further reducing the lifting load. In this embodiment, the mounting frame 22, the front transverse sealing frame 24 and the rear transverse sealing frame 26 are all provided with hollow structures to further reduce the weight of the overall lifting. The hollow holes can also be used to drop the cutting waste edges. A waste belt is provided below, and the dropped waste edges fall on the waste belt and are discharged. Practice has proved that the above structure can reduce the lifting load by more than 2 / 3 compared with the traditional drive structure.

[0034] For the transverse sealing drive assembly 23, the outer cylinder kit 233 is connected to at least one of the front transverse sealing frame 24 and the rear transverse sealing frame 26 through the connecting rod structure, so that at least one of the two transverse sealing frames can move in a straight line. In this way, the two transverse sealing frames can be moved closer to or farther away from each other. It can be connected only to the front transverse sealing frame 24 to drive the front transverse sealing frame 24 to move in a straight line, or it can be connected only to the rear transverse sealing frame 26 to drive the rear transverse sealing frame 26 to move in a straight line, and it can also be connected to both the front transverse sealing frame 24 and the rear transverse sealing frame 26 at the same time to drive both to move simultaneously.

[0035] In this embodiment, in order to improve the driving effect, the transverse sealing drive assembly 23 drives the front transverse sealing frame 24 and the rear transverse sealing frame 26 to be synchronously linked. The specific structure is that a guide hole is provided on the mounting frame 22, and a guide rod 237 is passed through the guide hole (through a linear bearing). The guide rod 237 can slide along the guide hole. Both ends of the guide rod 237 pass through the guide hole, respectively, and the front transverse sealing frame 24 is fixed on the first end of the guide rod 237. The rear transverse sealing frame 26 can slide The outer tube set 233 is connected to the rear transverse sealing frame 26 through the second connecting rod structure 235, and the outer tube set 233 is connected to the connecting rod 236 through the first connecting rod structure 234. The connecting rod 236 pushes the front transverse sealing frame 24 to move through the guide rod 237. Such a structure allows the front and rear heat sealing assemblies to be synchronously driven by the same driving assembly, and the front and rear heat sealing blocks can be coordinated to improve the driving efficiency. At the same time, the two heat sealing assemblies can be located on the same side of the driving assembly, avoiding the problem of strip package avoidance and the bulky structure caused by the driving assembly being located above, below or at both ends of the two heat sealing assemblies. In this embodiment, there are two parallel guide rods 237, which pass through the two ends of the mounting frame 22 respectively, and the two sets of heat sealing drive assemblies are located in the middle of the mounting frame 22, which can improve the stability of operation and have a compact structure.

[0036] As one of the embodiments, the first link structure 234 includes a first link 2341 and a second link 2342, one end of the first link 2341 is fixedly connected to the outer cylinder kit 233, and the other end is hinged to one end of the second link 2342, and the other end of the second link 2342 is hinged to the linkage frame 236; the second link structure 235 includes a third link 2351 and a fourth link 2352, one end of the third link 2351 is fixedly connected to the outer cylinder kit 233, and the other end is hinged to one end of the fourth link 2352, and the other end of the fourth link 2352 is hinged to the rear transverse sealing frame 26; the first link 2341 and the third link 2351 are located in a straight line, that is, the first link 2341 and the third link 2351 are respectively arranged on opposite sides of the outer cylinder kit 233. Such a driving structure can make the rear transverse sealing frame 26 and the linkage frame 236 approach each other or move away from each other, and the linkage frame 236 and the front transverse sealing frame 24 are rigidly connected by the guide rod 237, and the movement directions of the two are consistent. However, since the linkage frame 236 and the front transverse sealing frame 24 are respectively located on both sides of the rear transverse sealing frame 26, when the rear transverse sealing frame 26 and the linkage frame 236 approach each other, the rear transverse sealing frame 26 and the front transverse sealing frame 24 move away from each other, and vice versa.

[0037] Since the linear movement distance of the rear transverse sealing frame 26 and the front transverse sealing frame 24 is not too large, the rotation amplitude of the spline shaft 232 is not very large and is in a swinging state. Therefore, in this embodiment, the first drive motor 231 is connected to the spline shaft 232 through the third connecting rod structure 238. Compared with the method of directly connecting the first drive motor 231 to the spline shaft 232, a more reasonable spatial layout can be performed. The two first drive motors 231 can be vertically arranged beside the frame 1, and the drive motor on the lifting drive assembly 21 can be arranged horizontally. Specifically, as Figure 5 The third connecting rod structure 238 includes a fifth connecting rod 2381 and a sixth connecting rod 2382 , one end of the fifth connecting rod 2381 is connected to the first driving motor 231 , and the other end is hinged to one end of the sixth connecting rod 2382 , and the other end of the sixth connecting rod 2382 is fixedly connected to the spline shaft 232 .

[0038] The function of the lifting drive assembly 21 is to drive the mounting frame 22 to lift, and it can be a structure in which a servo motor drives a screw rod. In order to further rationally arrange the space, the lifting drive assembly 21 in this embodiment is in the form of a servo motor driving a synchronous belt, specifically, as follows Figures 5 to 8 The lifting drive assembly 21 includes a second servo motor 211, a transmission shaft 212, a driving wheel 213, a driven wheel 215 and a toothed belt 214. The second servo motor 211 is installed on the frame 1, and the transmission shaft 212 is horizontally installed on the frame 1. The second servo motor 211 is connected to the transmission shaft 212 in transmission connection. The driving wheel 213 is installed on the transmission shaft 212 and rotates with the transmission shaft 212. The toothed belt 214 surrounds the driving wheel 213 and the driven wheel 215 in the vertical direction. The mounting frame 22 is fixed on the toothed belt 214. The second servo motor 211 drives the driving wheel 213 to rotate through the transmission shaft 212, and the driving wheel 213 drives the toothed belt 214 to move, thereby driving the mounting frame 22 and the front heat sealing assembly and the rear heat sealing assembly thereon to rise and fall, so that the strip bag can be pulled downward while being horizontally sealed. The mounting frame 22 is also provided with a slider 28 , and the frame 1 is correspondingly provided with a slide rail 11 . The mounting frame 22 can be raised and lowered along the frame 1 through the cooperation between the slider 28 and the slide rail 11 .

[0039] In order to further simplify the mechanism, in this embodiment, Figure 7 , the driven wheel 215 on the first transverse sealing module 2 is rotatably mounted on the transmission shaft 212 on the second transverse sealing module 3 through a bearing, and there is no need to separately set a mounting shaft for the driven wheel 215. The driven wheel 215 on the second transverse sealing module 3 can also be mounted on the transmission shaft 212 on the first transverse sealing module 2 through a bearing, and can also be directly mounted on the frame 1. In this embodiment, the same lifting drive assembly 21 includes two sets of parallel driving wheels 213, driven wheels 215 and toothed belts 214, and the mounting frame 22 is fixed on the two sets of toothed belts 214.

[0040] A double horizontal sealing method for multi-row strip packages, such as Fig. 9 As shown, the above-mentioned multi-row strip package double transverse sealing mechanism is adopted, including the following steps:

[0041] S1. The mounting frame 22 of the first transverse sealing module 2 moves downward under the drive of the lifting drive assembly 21. In the process of driving the front heat sealing assembly and the rear heat sealing assembly to move downward, the front heat sealing block 25 and the rear heat sealing block 27 on the first transverse sealing module 2 are driven by the transverse sealing drive assembly 23 to approach each other and clamp the first strip package, and then pull the strip package downward for a length L1, and perform the first transverse seal on the first strip package at the same time, that is, the first transverse seal is performed synchronously in the process of pulling the strip package downward, and the heat sealing time must match the distance and speed of the pulling strip package; at the same time, the mounting frame 22 of the second transverse sealing module 3 moves upward to a distance L2 under the drive of the lifting drive assembly 21 and stops moving upward.

[0042] S2, the mounting frame 22 of the second transverse sealing module 3 moves downward under the drive of the lifting drive assembly 21, and in the process of driving the front heat sealing assembly and the rear heat sealing assembly to move downward, the front heat sealing block 25 and the rear heat sealing block 27 on the second transverse sealing module 3 are driven by the transverse sealing drive assembly 23 to move closer to each other and clamp the Nth package. Then, the first transverse sealing module 2 releases the first package (that is, its front heat sealing block 25 and the rear heat sealing block 27 are driven away from each other by the transverse sealing drive assembly 23), and the first transverse sealing module 2 starts to rise back to its original position. During this process, the second transverse sealing module 3 pulls the package downward The first transverse sealing module 2 moves a length of L2, and at the same time performs a second transverse sealing at the position of the first transverse sealing of the Nth bag, that is, the second transverse sealing is performed synchronously in the process of pulling the bag downward, and the heat sealing time must match the distance and speed of the pulling bag; when the first transverse sealing module 2 clamps the next bag (that is, the next bag to be sealed next to the first bag), the second transverse sealing module 3 releases the Nth bag, and then rises back to its position, completing a transverse sealing of the Nth bag (vertical grain + transverse grain, two transverse sealings), and the transverse sealing position is the connection between the upper and lower bags, and the upper and lower bags can be cut apart by punching at the transverse sealing position. At this time, the first bag has only completed the first transverse sealing, and the second transverse sealing module will subsequently perform the second transverse sealing on the first bag.

[0043] In the above steps, the first transverse sealing module 2 and the second transverse sealing module 3 have the same action, and both need to go through the four steps of downward synchronization and transverse seal clamping (clamping the strip package), pulling the film downward (or pulling the strip package downward), transverse seal opening (releasing the strip package), and quickly returning upward to complete each cycle of action. The two transverse seals cooperate with each other. When one transverse seal moves downward, the other transverse seal returns upward. However, after one transverse seal clamps the strip package, the other transverse seal releases the strip package. In this way, it can be ensured that there is always a transverse seal module clamping and fixing the strip package, the strip package will not shake, and the transverse seal position is accurate.

[0044] The sum of the strip length L1 pulled by the first transverse sealing module 2 and the strip length L2 pulled by the second transverse sealing module 3 is equal to the length L of each strip. L1 and L2 can be determined according to the time of the two heat seals, and can be set to be the same or different. The speed at which the first transverse sealing module 2 moves downward is equal to the speed at which the second transverse sealing module 3 moves downward. In this way, when the two transverse sealing modules are connected, they both move downward, which can ensure that the two downward movements are synchronized and will not cause pulling on the strip film due to inconsistent speeds. The speed at which the two transverse sealing modules return upward can be faster than the speed at which they move downward, so that rapid return can be achieved. As one implementation method, Fig. 9 , the times for the four steps of downward synchronization, horizontal seal clamping, downward film pulling, horizontal seal opening, and rapid upward return of the first horizontal sealing module 2 are t1, t2, t3, and t4 respectively. The three steps of downward synchronization, horizontal seal clamping, downward film pulling, and horizontal seal opening are all performed in the process of downward synchronization. The time for downward synchronization is T3=t1+t2+t3, and the time for upward return is t4. The duration of one cycle of the first horizontal sealing module 2 is T1=T3+t4=t1+t2+t3+t4; similarly, the times for the four steps of downward synchronization, horizontal seal clamping, downward film pulling, horizontal seal opening, and rapid upward return of the first horizontal sealing module 2 are t5, t6, t7, and t8 respectively. The time for downward synchronization is T4=t5+t6+t7, and the time for upward return is t8. The duration of one cycle of the first horizontal sealing module 2 is T2=T4+t8=t5+t6+t7+t8. As one implementation, t1 = t5, t2 = t6, t3 = t7, t4 = t8, T3 = T4, T1 = T2. Of course, the duration of each step of the two transverse sealing modules can also be set as required.

[0045] In this embodiment, 1<N≤10, the Nth package is the second package, the third package, the fourth package, the fifth package, the sixth package, the seventh package, the eighth package, the ninth package or the tenth package below the first package, that is, the package clamped by the second transverse sealing module is any other set package below the first transverse sealing module, and the first transverse sealing module and the second transverse sealing module do not heat-seal the transverse sealing position of the same package in one transverse sealing cycle, and there are several packages in between. The specific number of packages in the interval depends on the length of the package and the size of the transverse sealing module.

[0046] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the patent scope of this case.

Claims

1. A double transverse sealing mechanism for multi-row strip packages, characterized in that: The machine comprises a frame and a first transverse sealing module and a second transverse sealing module which are sequentially arranged on the frame from top to bottom, and the first transverse sealing module and the second transverse sealing module are parallel to each other vertically and are respectively used for performing a first transverse sealing and a second transverse sealing on the strip package; the first transverse sealing module and the second transverse sealing module have the same structure and both comprise a lifting drive assembly, a mounting frame, a front heat sealing assembly, a rear heat sealing assembly and a transverse sealing drive assembly, and the lifting drive assembly, the mounting frame, the front heat sealing assembly, the rear heat sealing assembly and the transverse sealing drive assembly on the first transverse sealing module and the second transverse sealing module are respectively positioned one by one opposite to each other; The lifting drive assembly is mounted on the frame, and the front heat sealing assembly and the rear heat sealing assembly are relatively mounted on the mounting frame, and the mounting frame is connected to the lifting drive assembly, and the mounting frame is lifted and lowered along the frame under the drive of the lifting drive assembly, driving the front heat sealing assembly and the rear heat sealing assembly to lift and lower together, thereby pulling a section of the strip package downward; the front heat sealing assembly includes a front transverse sealing frame and a plurality of front heat sealing blocks arranged side by side on the front transverse sealing frame, and the rear heat sealing assembly includes a rear transverse sealing frame and a plurality of rear heat sealing blocks arranged side by side on the rear transverse sealing frame, and the transverse sealing drive assembly includes a first driving motor, a ball spline structure and a connecting rod structure, the first driving motor is mounted on the frame, the ball spline structure includes a spline shaft and an outer cylinder kit sleeved on the spline shaft and capable of linear and rotational motion, the spline The shaft is vertically arranged on the frame, and the outer cylinder kit is installed on the mounting frame, and the first driving motor is connected to the spline shaft to drive the spline shaft to rotate, and the outer cylinder kit and the mounting frame can be lifted and lowered along the spline shaft while driving the outer cylinder kit to rotate; the front transverse sealing frame and the rear transverse sealing frame are arranged opposite to each other, and the number of front heat sealing blocks and rear heat sealing blocks are equal, and the positions are relative to each other so that the front heat sealing blocks and the rear heat sealing blocks can cooperate with each other to clamp the strip package and perform transverse sealing on the strip package, and the outer cylinder kit is connected to at least one of the front transverse sealing frame and the rear transverse sealing frame through the connecting rod structure, and the rotation of the outer cylinder kit drives at least one of the front transverse sealing frame and the rear transverse sealing frame to move linearly through the connecting rod structure, so that the front transverse sealing frame and the rear transverse sealing frame are close to or away from each other, so that the front heat sealing block and the rear heat sealing block are close to each other to clamp the strip package and perform transverse sealing on the strip package.

2. A multi-row strip bag double transverse sealing mechanism according to claim 1, characterized in that: The heat sealing surfaces of the front heat sealing block and the rear heat sealing block on the first transverse sealing module are both longitudinal grain structures, which are used to heat seal longitudinal grains on the strip packages; the heat sealing surfaces of the front heat sealing block and the rear heat sealing block on the second transverse sealing module are both transverse grain structures, which are used to heat seal transverse grains on the strip packages at positions adjacent to the longitudinal grains heat sealed by the first transverse sealing module.

3. A multi-row strip bag double transverse sealing mechanism according to claim 1, characterized in that: The mounting frame is provided with a guide hole, in which a guide rod is passed, and the guide rod can slide along the guide hole, and both ends of the guide rod pass through the guide hole, namely a first end and a second end, and the front transverse sealing frame is fixed on the first end of the guide rod, and the rear transverse sealing frame can be slidably installed on the guide rod and is located between the mounting frame and the front transverse sealing frame, and a linkage frame is fixed on the second end of the guide rod; the connecting rod structure includes a first connecting rod structure and a second connecting rod structure, and the outer cylinder kit is connected to the rear transverse sealing frame through the second connecting rod structure, and the outer cylinder kit is connected to the linkage frame through the first connecting rod structure, and the linkage frame pushes the front transverse sealing frame to move through the guide rod.

4. A multi-row strip bag double transverse sealing mechanism according to claim 3, characterized in that: The first link structure includes a first link and a second link, one end of the first link is fixedly connected to the outer tube kit, the other end is hinged to one end of the second link, and the other end of the second link is hinged to the linkage frame; the second link structure includes a third link and a fourth link, one end of the third link is fixedly connected to the outer tube kit, the other end is hinged to one end of the fourth link, and the other end of the fourth link is hinged to the rear transverse sealing frame; the first link and the third link are located in a straight line.

5. A multi-row strip bag double transverse sealing mechanism according to claim 1, characterized in that: The first drive motor is drivingly connected to the spline shaft through a third connecting rod structure, and the third connecting rod structure includes a fifth connecting rod and a sixth connecting rod, one end of the fifth connecting rod is connected to the first drive motor, and the other end is hinged to one end of the sixth connecting rod, and the other end of the sixth connecting rod is fixedly connected to the spline shaft.

6. A multi-row strip bag double transverse sealing mechanism according to claim 1, characterized in that: The transverse sealing drive components are provided in two groups in parallel, and the two groups of transverse sealing drive components are used to jointly drive the front heat sealing component and the rear heat sealing component to move closer to or away from each other.

7. A double transverse sealing mechanism for multi-row strip packages according to claim 1, characterized in that: The lifting drive assembly includes a second servo motor, a transmission shaft, a driving wheel, a driven wheel and a toothed belt. The second servo motor is installed on the frame, the transmission shaft is horizontally installed on the frame, the second servo motor is connected to the transmission shaft, the driving wheel is installed on the transmission shaft and rotates with the transmission shaft, the toothed belt surrounds the driving wheel and the driven wheel in the vertical direction, the mounting frame is fixed on the toothed belt, the second servo motor drives the driving wheel to rotate through the transmission shaft, and the driving wheel drives the toothed belt to move, thereby driving the mounting frame and the front heat sealing assembly and the rear heat sealing assembly thereon to rise and fall.

8. A multi-row strip bag double transverse sealing mechanism according to claim 7, characterized in that: The mounting frame is also provided with a slider, and the frame is provided with a slide rail compatible with the slider. The mounting frame can be lifted and lowered along the frame through the cooperation of the slider and the slide rail; the driven wheel on the first transverse sealing module is rotatably mounted on the transmission shaft on the second transverse sealing module through a bearing; the same lifting drive assembly includes two sets of driving wheels, driven wheels and toothed belts arranged in parallel, and the mounting frame is fixed on the two sets of toothed belts.

9. A method for double transverse sealing of multi-row strip packages, using a double transverse sealing mechanism for multi-row strip packages as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, the mounting frame of the first transverse sealing module moves downward under the drive of the lifting drive assembly, and in the process of driving the front heat sealing assembly and the rear heat sealing assembly to move downward, the front heat sealing block and the rear heat sealing block on the first transverse sealing module are driven by the transverse sealing drive assembly to approach each other and clamp the first bag, and then pull the bag downward for a length L1, and perform the first transverse seal on the first bag at the same time; in this process, the mounting frame of the second transverse sealing module moves upward to a distance L2 under the drive of the lifting drive assembly and then stops moving upward; S2, the mounting frame of the second transverse sealing module moves downward under the drive of the lifting drive assembly, and in the process of driving the front heat sealing assembly and the rear heat sealing assembly to move downward, the front heat sealing block and the rear heat sealing block on the second transverse sealing module are driven by the transverse sealing drive assembly to approach each other and clamp the Nth package, and then the first transverse sealing module releases the first package, and the first transverse sealing module starts to rise and return to its position. During this process, the second transverse sealing module pulls the package downward for a length of L2, and at the same time performs a second transverse seal at the position of the first transverse seal of the Nth package; when the first transverse sealing module clamps the next package (that is, the next package to be sealed next to the first package), the second transverse sealing module releases the Nth package, and then rises and returns to its position, completing a transverse seal of the Nth package; The steps of clamping the strip package, pulling the strip package downwards and releasing the strip package of the first transverse sealing module or the second transverse sealing module are all completed in the process of moving downwards.

10. According to the method for transverse sealing of multiple strip packages according to claim 9, the sum of the length L1 of the strip packages pulled by the first transverse sealing module and the length L2 of the strip packages pulled by the second transverse sealing module is equal to the length L of each strip package; the downward moving speed of the first transverse sealing module is equal to the downward moving speed of the second transverse sealing module; 1<N≤10, the Nth strip package is the second strip package, the third strip package, the fourth strip package, the fifth strip package, the sixth strip package, the seventh strip package, the eighth strip package, the ninth strip package or the tenth strip package below the first strip package.

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