A double horizontal sealing mechanism and method for multi-row strip packages

Abstract

A double transverse sealing mechanism and method for multi-row strip bales comprises a first and second transverse sealing module, arranged in parallel, for performing the first and second transverse sealing operations on the strip bales, respectively. The modules comprise a lifting drive assembly, a mounting frame, a front heat-sealing assembly, a rear heat-sealing assembly, and a transverse sealing drive assembly. The mounting frame is connected to the lifting drive assembly. The transverse sealing drive assembly comprises a first drive motor, a ball spline structure, and a connecting rod structure. The ball spline structure comprises a spline shaft and an outer cylinder assembly. The outer cylinder assembly is mounted on the mounting frame. The first drive motor is connected to the spline shaft for driving. The outer cylinder assembly and the mounting frame can be raised and lowered along the spline shaft. The outer cylinder assembly is connected to at least one of the front and rear transverse sealing frames via a connecting rod structure. The two transverse sealing units enhance sealing performance, speed, and quality. The transverse sealing drive structure reduces lifting loads, ensures uniform heat-sealing force, and improves heat-sealing quality. The mechanism is suitable for synchronous transverse sealing of multi-row strip bales.

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 bag machines are mainly used for packaging granular, powder and liquid materials. The main processes include conveying packaging film, strip bag forming, sealing the longitudinal edges of the strip bags, sealing the transverse edges of the strip bags, filling the materials, dividing the strip bags, cutting the easy-to-tear edges and rejecting defective products. The strip bag machine can package a single row of strip bags at a time, and can also produce multiple rows of strip bags at a time. The multi-row strip bag machine is suitable for the production of small-volume strip bags. When packaging multiple rows of 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 of the strip bag and insufficient force on the middle of the strip bag. As for the transverse sealing mechanism of the multi-row strip bag, it is mainly to seal the strip bag transversely during the strip bag forming process. Generally, heat sealing is used. The front and rear hot 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 mechanism often has problems such as poor sealing effect and too low transverse sealing speed. In particular, for the production of multi-row 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 and move one station, if the clamping force between the front and rear hot stamping blocks is insufficient, the strip bag pulling process will fail, affecting the transverse sealing effect and also affecting subsequent processes; for strip bags subjected to excessive force, the transverse sealing of the strip bags will be damaged, such as excessive hot stamping causing deformation of the heat sealing film, or even damaging the heat sealing film and causing the strip bags to be damaged, affecting the quality of the final product. The existing strip packaging mechanism is generally in the form of a single horizontal seal, which only performs one horizontal seal on the strip package. After the single horizontal seal pulls the film downward to a certain position, it needs to return upward and pull the film again. During the upward return process, the strip package film cannot continue to move downward, resulting in a pause in the strip package 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 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 from top to bottom, wherein 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 bag; 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, mounting frame, front heat sealing assembly, rear heat sealing assembly and transverse sealing drive assembly on the first transverse sealing module and the second transverse sealing module are positioned one-to-one opposite to each other, that is, the lifting drive assembly, mounting frame, front heat sealing assembly, rear heat sealing assembly and transverse sealing drive assembly on the first transverse sealing module are positioned one-to-one opposite to the lifting drive assembly, mounting frame, front heat sealing assembly, rear heat sealing assembly and transverse sealing drive assembly on the second transverse sealing module.

[0006] The lifting drive assembly is installed on the frame, and the front heat sealing assembly and the rear heat sealing assembly are relatively installed 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 installed 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 motion and rotational motion. The spline 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 drives the outer cylinder kit to rotate. At the same time, the outer cylinder kit and the mounting frame can be raised and lowered along the spline shaft; 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 the rear heat sealing blocks are equal, and their 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 packages and perform transverse sealing on the strip packages. 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, thereby making the front heat sealing block and the rear heat sealing block close to each other to perform transverse sealing on the strip packages.

[0007] Furthermore, the heat-sealing surfaces of the front and rear heat-sealing blocks of the first transverse sealing module are both longitudinally ribbed, used to heat-seal longitudinal grooves on the strip pack. The heat-sealing surfaces of the front and rear heat-sealing blocks of the second transverse sealing module are both transversely ribbed, used to heat-seal transverse grooves on the strip pack adjacent to the longitudinal grooves heat-sealed by the first transverse sealing module. The combination of longitudinal and transverse grooves enhances sealing. The first and second transverse sealing modules work together to pull the strip pack downward, increasing 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, respectively 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 mounted 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 cylinder kit is connected to the rear transverse sealing frame through the second connecting rod structure, 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.

[0009] Furthermore, 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 driven and 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 are provided in 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 rise and fall, so that the strip bag can be pulled downward while sealing horizontally.

[0013] Furthermore, the mounting frame is equipped with a slider, and the frame is equipped with a corresponding slide rail. The mounting frame can be raised 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 drive shaft of the second transverse sealing module via 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 to both sets of toothed belts.

[0014] A method for double transverse sealing of multiple strip packs, using the above-mentioned double transverse sealing mechanism for multiple strip packs, 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. 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. At the same time, the first transverse seal is performed on the first bag, that is, the first transverse seal is performed synchronously during the process of pulling the bag downward, and the heat sealing time must match the distance and speed of pulling the bag; during 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. 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 move closer to each other and clamp the Nth package. Then, the first transverse sealing module releases the first package (that is, its front heat sealing block and the rear heat sealing block are driven away from each other by the transverse sealing drive assembly). 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. A second transverse seal is applied at the location of the first transverse seal on the Nth bag. This second seal is performed simultaneously with the downward movement of the bag, with the heat-sealing time matching the distance and speed of the bag. After the first transverse seal module clamps the next bag (the next bag to be sealed next to the first), the second transverse seal module releases the Nth bag and then rises back to its original position, completing a single transverse seal (two transverse seals, vertical and horizontal) on the Nth bag. This transverse seal is the connection between the upper and lower bags, and punching at this location can separate the upper and lower bags. At this point, only the first transverse seal has been completed on the first bag, 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 packages pulled by the first transverse sealing module and the length L2 of the strip packages pulled by the second transverse sealing module equals the length L of each strip package; the downward movement speed of the first transverse sealing module is equal to the downward movement speed of the second transverse sealing module. The upward return speed can be faster than the downward movement speed to achieve rapid return. 1<N≤10, the Nth strip package is the second, third, fourth, fifth, sixth, seventh, eighth, ninth, or tenth strip package below the first strip package, that is, the strip packages clamped by the second transverse sealing module are other strip packages below the first transverse sealing module. The first and second transverse sealing modules do not heat-seal the transverse sealing positions of the same strip package during a transverse sealing cycle, and there is a number of strip packages in between. The specific number of strip packages in between is determined by the length of the strip package and the size of the transverse sealing module.

[0019] The present invention provides two sets 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 sets of transverse seals can alternately pull the strip bag downwards, and compared with a single set of transverse seals, the time for the transverse seals to rise and return to their positions is saved, and the film can be pulled without stopping for heat sealing, thereby improving the production speed; and the two sets of transverse seals can ensure that there is always one set of transverse seals to clamp 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 parts 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 the 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, reducing the energy load and equipment cost; the transverse seal The drive assembly drives the two heat-sealing blocks to move synchronously and 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 insufficient force on some strip bags and incomplete heat sealing, and there are still unbonded areas. Some heat-sealing blocks are damaged by impact force and excessive clamping force, destroying the strip bags, or over-heating. 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 Schematic diagram of the structure of an embodiment of the present invention.

[0021] Figure 2 This is a structural diagram from another perspective of an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the partial structure of the first transverse sealing module in an embodiment of the present invention.

[0023] Figure 4 FIG. 2 is a schematic diagram of another part of the structure of the first transverse sealing module in an embodiment of the present invention. FIG.

[0024] Figure 5 It is a partial enlarged schematic diagram of the structure 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 in the AA direction.

[0028] Figure 9 This is a diagram showing the working principle of the two transverse sealing modules cooperating with each other 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 multiple 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. The first transverse sealing module 2 and the second transverse sealing module 3 are parallel to each other and are used to perform the first transverse sealing and the second transverse sealing on the strip package respectively. The structures of the first transverse sealing module 2 and the second transverse sealing module 3 are the same. Taking the first transverse sealing module 2 as an example, 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 mounted on the frame 1, and the front heat sealing assembly and the rear heat sealing assembly are relatively mounted on the mounting frame 22. The mounting frame 22 is connected to the lifting drive assembly 21, and 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, and 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 mounted on the frame 1, and the ball spline structure includes a spline shaft 232 and an outer cylinder kit 233 sleeved on the spline shaft 232 and capable of linear 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 raised 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, and the number of the front heat sealing block 25 and the rear heat sealing block 27 are equal, and the positions are relative to each other so that the front heat sealing block 25 and the rear heat sealing block 27 are opposite to each other. The rear heat sealing blocks 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 in a straight line 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 installed to perform transverse sealing at the same location on the strip pack, improving sealing quality. The two transverse sealing modules alternately pull the film, increasing production speed. In one embodiment, the heat-sealing surfaces of the front and rear heat-sealing blocks 25 and 27 on the first transverse sealing module 2 are both longitudinally ribbed, used to heat-seal longitudinal ribs on the strip pack. The heat-sealing surfaces of the front and rear heat-sealing blocks 25 and 27 on the second transverse sealing module 3 are both transversely ribbed, used to heat-seal transverse ribs immediately adjacent to the longitudinal ribs heat-sealed by the first transverse sealing module 2. The transverse and longitudinal ribs are placed as close together as possible, and the combination of the longitudinal and transverse ribs enhances sealing. The transverse ribs are positioned below the longitudinal ribs. After the strip pack is cut, the transverse ribs are located at the ends, while the longitudinal ribs are located near the center. The first and second transverse sealing modules alternately pull the strip pack downward, saving time when the transverse sealing modules return to their original positions and increasing production speed. To achieve this, the components of the first and second transverse sealing modules 2 and 3 must operate independently.

[0033] The ball spline structure allows the first drive motor 231 to be installed independently of the mounting frame 22 (fixed to the frame 1). Instead, the spline shaft 232 transmits power to drive the front and rear heat-sealing assemblies to move linearly for transverse heat sealing. This allows the mounting frame 22 to simultaneously drive the front and rear heat-sealing assemblies up and down. The external placement of the first drive motor 231 significantly reduces the load on the mounting frame 22, facilitating easy lifting and lowering. In this embodiment, the transverse sealing drive assemblies 23 are arranged in two parallel groups. These two groups of transverse sealing drive assemblies 23 jointly drive the front and rear heat-sealing assemblies toward or away from each other, accommodating equipment with a large number of strip packs and ensuring uniform force distribution. In this embodiment, the strip packs are arranged in 12 parallel rows. Using the aforementioned ball spline structure as the driving component of the transverse sealing drive assemblies 23, both first drive motors 231 can be located externally from the mounting frame 22, further reducing the lifting load. In this embodiment, the mounting frame 22, front transverse sealing frame 24, and rear transverse sealing frame 26 are all hollowed out to further reduce the overall lifting weight. The hollowed-out holes also allow for the removal of cutting waste, which is then discharged onto a waste conveyor located below. Practice has proven that this structure can reduce the lifting load by over two-thirds compared to traditional drive structures.

[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, so that the two transverse sealing frames can be moved closer to or 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 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, the first end and the second end. The front transverse sealing frame 24 is fixed on the first end of the guide rod 237, and the rear transverse sealing frame 26 can slide. The outer cylinder assembly 233 is dynamically mounted on a guide rod 237 and located between the mounting frame 22 and the front transverse sealing frame 24. A linkage frame 236 is fixed to the second end of the guide rod 237. The linkage structure includes a first linkage structure 234 and a second linkage structure 235. The outer cylinder assembly 233 is connected to the rear transverse sealing frame 26 via the second linkage structure 235, and the outer cylinder assembly 233 is connected to the linkage frame 236 via the first linkage structure 234. The linkage frame 236 drives the front transverse sealing frame 24 via the guide rod 237. This structure allows the front and rear heat sealing assemblies to be synchronously driven by the same drive assembly, allowing the front and rear heat sealing blocks to work in tandem, improving drive efficiency. It also allows the two heat sealing assemblies to be located on the same side of the drive assembly, avoiding issues with strip avoidance and bulky structures that would arise if the drive assembly were located above, below, or at either end of the two heat sealing assemblies. In this embodiment, two parallel guide rods 237 are provided, one passing through each end of the mounting frame 22. The two sets of heat sealing drive assemblies are located in the middle of the mounting frame 22, improving operational stability and achieving a compact structure.

[0036] As one embodiment, 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 distance that the rear transverse sealing frame 26 and the front transverse sealing frame 24 move in a straight line is not too large, the rotation amplitude of the spline shaft 232 is not too 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 made. 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 drive motor 231, and the other end is hinged to one end of the sixth connecting rod 2382. 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 move up and down, 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 shown in FIG. 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 for transmission. The driving wheel 213 is installed on the transmission shaft 212 and rotates with the transmission shaft 212. The toothed belt 214 is vertically wrapped around the driving wheel 213 and the driven wheel 215. 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 further provided with a slider 28 , and the rack 1 is correspondingly provided with a slide rail 11 . The mounting frame 22 can be raised and lowered along the rack 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 pulley 215 on the first transverse seal module 2 is rotatably mounted on the drive shaft 212 on the second transverse seal module 3 via a bearing. A separate mounting shaft for the driven pulley 215 is not required. The driven pulley 215 on the second transverse seal module 3 can also be mounted on the drive shaft 212 on the first transverse seal module 2 via a bearing, or directly on the frame 1. In this embodiment, the same lifting drive assembly 21 includes two sets of parallel driving pulleys 213, driven pulleys 215, and toothed belts 214. The mounting frame 22 is fixed to the two sets of toothed belts 214.

[0040] A double horizontal sealing method for multi-row strip packages, such as Figure 9 As shown, the above-mentioned multi-row strip bag double transverse sealing mechanism includes 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 bag. Then, the bag is pulled downward for a length L1 and the first transverse seal is performed on the first bag at the same time. That is, the first 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 pulling the bag. 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 then 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 module then moves a length L2 and simultaneously performs a second transverse seal at the location of the first transverse seal on the Nth bag. This means that the second transverse seal is performed simultaneously with the downward movement of the bag, with the heat-sealing time matching the distance and speed of the bag. After the first transverse sealing module 2 clamps the next bag (i.e., the next bag to be sealed, adjacent to the first), the second transverse sealing module 3 releases the Nth bag and then rises back to its original position, completing a single transverse seal (two transverse seals, longitudinal and transverse) on the Nth bag. This transverse seal is the junction of the upper and lower bags, and punching at this location can separate the upper and lower bags. At this point, only the first transverse seal has been completed on the first bag, and the second transverse sealing module will subsequently perform the second transverse seal 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 bag), pulling the film downward (or pulling the strip bag downward), transverse seal opening (releasing the strip bag), and quickly returning upward to complete their respective cycles 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 bag, the other transverse seal releases the strip bag. In this way, it can be ensured that there is always a transverse sealing module clamping and fixing the strip bag, the strip bag 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 of the first transverse sealing module 2 moving downward is equal to the speed of the second transverse sealing module 3 moving downward. In this way, when the two transverse sealing modules are connected, they move downward to 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 embodiment, Figure 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 transverse 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 during the downward synchronization process. Therefore, 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 transverse 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 transverse 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 transverse sealing module 2 is T2 = T4 + t8 = t5 + t6 + t7 + t8. As one embodiment, 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 needed.

[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. The first transverse sealing module and the second transverse sealing module do not heat-seal the transverse sealing positions of the same package in one transverse sealing cycle, and there are several packages in between. The specific number of packages in the interval is determined by 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 depart 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 sequentially arranged on the frame from top to bottom, wherein the first transverse sealing module and the second transverse sealing module are vertically parallel to each other and are respectively used to perform a first transverse seal and a second transverse seal on the strip bag; 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 to 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 driven by the lifting drive assembly to lift and lower along the frame, driving the front heat sealing assembly and the rear heat sealing assembly to lift and lower together, thereby pulling a section of strip bag 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 motion 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 the outer cylinder kit rotates; the front transverse sealing frame and the rear transverse sealing frame are arranged opposite to each other, and the number of the front heat sealing block and the rear heat sealing block are equal, and their positions are relative to each other so that the front heat sealing block and the rear heat sealing block can cooperate with each other to clamp the strip package and perform transverse sealing on the strip package; 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 approach or move away from each other, thereby making the front heat sealing block and the rear heat sealing block approach each other to clamp the strip package and perform transverse sealing on the strip package; The mounting frame is provided with a guide hole, a guide rod is passed through the guide hole, and the guide rod can slide along the guide hole, and both ends of the guide rod pass through the guide hole, respectively, the first end and the second end, the front transverse sealing frame is fixed on the first end of the guide rod, and the rear transverse sealing frame can be slidably mounted 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 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; 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 sleeve, 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 sleeve, 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; 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 rise and fall.

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

4. A multi-row strip pack 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 jointly drive the front heat sealing component and the rear heat sealing component to move closer to or away from each other.

5. A multi-row strip pack double transverse sealing mechanism according to claim 4, 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.

6. A method for double transverse sealing of multiple strip packs, using a double transverse sealing mechanism for multiple strip packs as claimed in any one of claims 1 to 5, 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, 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 first transverse sealing module, driven by the transverse sealing drive assembly, approach each other and clamp the first bag, then pull the bag downward by a length L1 and perform the first transverse seal on the first bag. During this process, the mounting frame of the second transverse sealing module, driven by the lifting drive assembly, moves upward to a distance L2 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, 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 bag under the drive of the transverse sealing drive assembly. After that, the first transverse sealing module releases the first bag and begins to rise back to its original position. During this process, the second transverse sealing module pulls the bag downward for a length L2 and simultaneously performs a second transverse seal at the position of the first transverse seal of the Nth bag. After the first transverse sealing module clamps the next bag, the second transverse sealing module releases the Nth bag and then rises back to its original position, completing a transverse seal for the Nth bag. 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.

7. A method for double transverse sealing of multiple strip packages according to claim 6, wherein 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 movement speed of the first transverse sealing module is equal to the downward movement speed of the second transverse sealing module; 1<N≤10, and the Nth strip package is the second, third, fourth, fifth, sixth, seventh, eighth, ninth or tenth strip package below the first strip package.

Images