Point breaking device for bag making machine

Abstract

The utility model relates to a spot-breaking device for a bag making machine, which comprises a spot-breaking frame, a tool apron for loading a spot-breaking hob and a tool apron driving mechanism for driving the tool apron to slide back and forth along the spot-breaking frame are arranged on the spot-breaking frame, the spot-breaking hob is rotatably mounted in the tool apron, and a spot-breaking platform is arranged at one end, corresponding to the spot-breaking hob, of the spot-breaking frame. The cutter holder driving mechanism is used for driving the point-breaking hob to roll along the dotting platform, the cutter holder is provided with a hob lifting mechanism for driving the point-breaking hob to be close to or away from the dotting platform, the easy-to-tear opening is formed in the mode that the cutter holder driving mechanism drives the point-breaking hob to roll along the dotting platform, and a traditional axial lifting dotting mode is replaced. Abrasion of the dotting knife is greatly reduced, durability and efficiency are improved, dotting efficiency and quality are improved, the point breaking hob is controlled to ascend and descend through the hob lifting mechanism, then when an easy-to-tear opening is formed in a bag body, the two ends of the easy-to-tear opening can be lifted, and the problem that the bag body is prone to being separated due to the fact that the easy-to-tear opening is formed to the bottom is solved.

Description

Technical Field

[0001] The utility model relates to the field of bag making machines, in particular to a point breaking device for bag making machines. Background Art

[0002] Bags are indispensable items in people's daily lives. People use bags to store and hold things for the convenience of carrying or storing. With the development of the petrochemical industry, people have gradually developed a variety of plastic bags, which are not only light and thin, but also have certain strength and toughness, thus greatly increasing the convenience of people's use. At the same time, with the development of the express delivery industry, people's frequency of using express bags has also increased.

[0003] A bag making machine is a machine for making various plastic packaging bags or other material packaging bags. The existing Chinese patent with application number CN202120203318.5 discloses a point-breaking device for a continuous roll bag making machine, including a point-breaking base and a point-breaking knife beam, a guide shaft and a dotting knife. The guide shaft passes through the point-breaking base and is connected to the point-breaking knife beam, and drives the point-breaking knife beam to reciprocate toward one end of the point-breaking base. A point-breaking pressure plate is provided between the point-breaking base and the point-breaking knife beam. The point-breaking pressure plate is sleeved on the guide shaft, the guide shaft is provided with a retaining ring, the point-breaking pressure plate is provided with a notch, and the point-breaking pressure plate is provided with a straightening mechanism. The two ends of the dotting surface of the continuous roll bag are straightened by the straightening mechanism before dotting, thereby improving the dotting stability and completeness. The continuous roll bags of different specifications are adapted through the knife holder adjustment mechanism and the pressure plate adjustment mechanism.

[0004] However, the point breaking device for the continuous bag-on-roll bag making machine has the following defects in actual use:

[0005] Because it drives the dotting knife on the conical tool holder to move up and down axially through the driving guide shaft and cooperates with the dotting base, the dotting knife passes through the incision and then dots the dotting surface to form an easy-to-tear notch. However, when high-speed dotting is required to form an easy-to-tear notch, the dotting knife is usually made of low-priced iron material, which is easy to wear during the dotting process, resulting in the need for frequent tool changes for the dotting device, affecting the processing efficiency of the bag-making machine. At the same time, wear-resistant ceramic knives are also used as dotting knives for dotting, but the price of ceramic knives is too high, but they also have a certain service life. Using them as additional consumables will greatly increase the production cost of the equipment.

[0006] When replacing the cutting blade of the existing cutting device, it is necessary to unscrew multiple fixing bolts between the conical tool holder and the cutting blade to replace the cutting blade. The entire replacement process is very cumbersome and affects the overall processing efficiency.

[0007] When the existing dotting device is used for dotting, a tearing notch is formed between the bag bodies, which runs through the left and right ends of the bag body. However, since there is no reserved space at both ends of the tearing notch, the bag bodies are easily separated, which affects the production and use of the continuous roll bag. Summary of the Invention

[0008] The technical problem to be solved by the utility model is to provide a point breaking device for a bag making machine in view of the deficiencies of the above-mentioned prior art.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dot breaking device for a bag making machine, comprising a dot breaking frame, the dot breaking frame being provided with a tool holder loaded with a dot breaking cutter and a tool holder driving mechanism for driving the tool holder to slide back and forth along the dot breaking frame, the dot breaking cutter being rotatably installed in the tool holder, the dotting platform being provided at one end of the dot breaking frame corresponding to the dot breaking cutter, and the tool holder driving mechanism being used to drive the dot breaking cutter to roll along the dotting platform.

[0010] By adopting the above technical solution, the tool holder driving mechanism can be a screw sleeve drive, synchronous belt drive, sprocket drive, gear rack drive and other structures. The tool holder driving mechanism drives the dotting cutter to roll along the dotting platform to form an easy-to-tear cut, replacing the traditional axial lifting dotting method, greatly reducing the wear of the dotting knife, improving durability and efficiency, and improving the efficiency and quality of dotting.

[0011] The above-mentioned dotting device for a bag making machine may be further configured as follows: a cutter lifting mechanism for driving the dotting cutter to move closer to or away from the dotting platform is provided on the cutter holder.

[0012] By adopting the above technical solution, the cutter lifting plate is slidably connected to the cutter seat through the cutter slider rail structure, which is convenient for adjusting the distance between the point-breaking cutter and the dotting platform. The axial adjustment of the point-breaking cutter is achieved through the cutter lifting mechanism to adapt to bags of different thicknesses. At the same time, the lifting and lowering of the point-breaking cutter can be controlled by the cutter lifting mechanism. Then, when the bag body is punched with an easy-tear notch, its two ends can be lifted to avoid the problem of the easy-tear notch being punched to the bottom, causing the bag body to be easily separated.

[0013] The above-mentioned dotting device for a bag making machine can be further configured as follows: the dotting platform is provided with a platform lifting mechanism for driving the dotting platform close to or away from the dotting cutter, and the platform lifting mechanism includes at least one platform lifting drive source arranged on the dotting frame, and the platform lifting drive source drives the dotting platform close to or away from the dotting cutter.

[0014] By adopting the above technical solution, the platform lifting drive source drives the dotting platform to move vertically, so that the dotting platform can be close to or away from the dotting cutter to adapt to bags of different thicknesses. At the same time, the dotting platform can be controlled to rise and fall through the platform lifting mechanism, so that when the bag is punched with an easy-tear notch, its two ends can be lifted to avoid the problem of the bag body being easily separated due to the easy-tear notch being punched to the bottom.

[0015] The above-mentioned point-breaking device for a bag-making machine may be further configured as follows: at least one clearance notch is provided on the outer periphery of the point-breaking hob.

[0016] By adopting the above technical solution, different specifications of dot-breaking rollers are equipped according to the width of the bag body that needs to form an easy-tear opening, and then a clearance gap is opened on the dot-breaking roller. In this way, the dot-breaking roller that rolls and dots will dot the bag body back and forth to form an easy-tear opening. However, due to the setting of the clearance gap, the dot-breaking roller can be rotated to the clearance gap at both ends of the bag body, avoiding the formation of easy-tear openings at both ends of the bag body and avoiding the problem of the easy-tear opening hitting the bottom and causing the bag body to be easily separated.

[0017] The above-mentioned point breaking device for a bag making machine can be further configured as follows: the roller cutter lifting mechanism includes a roller cutter lifting plate arranged on the cutter seat, the point breaking roller cutter is rotatably mounted on the roller cutter lifting plate, the roller cutter lifting plate is slidably connected to the cutter seat through an axially arranged roller cutter slider rail structure, the cutter seat is provided with a roller cutter lifting drive source, the roller cutter lifting plate is connected to the output end of the roller cutter lifting drive source, and as the roller cutter lifting drive source works, the point breaking roller cutter is urged to approach or move away from the dotting platform.

[0018] By adopting the above technical solution, the hob lifting plate is connected through the output end of the hob lifting drive source to realize the axial lifting of the point-breaking hob, and stable axial positioning and guiding sliding is achieved through the axially arranged hob slider rail structure.

[0019] The above-mentioned point breaking device for a bag making machine can be further configured as follows: the hob lifting drive source is a hob lifting motor, the output end of the hob lifting motor is connected to a hob lifting screw, the hob lifting plate is provided with a hob lifting screw sleeve threadedly connected to the hob lifting screw, the hob lifting motor drives the hob lifting screw to rotate, and the hob lifting plate is linked to axial lifting.

[0020] By adopting the above technical solution, the hob lifting motor drives the hob lifting screw to rotate, and the axial lifting of the hob lifting plate is realized through the hob lifting sleeve. The hob lifting motor and the hob lifting screw are used to realize the precise lifting of the point-breaking hob. In order to improve the accuracy, the hob lifting motor is preferably a servo motor. At the same time, a coupling is set between the hob lifting motor and the hob lifting screw to avoid the problem of different axes of the hob lifting motor and the hob lifting screw.

[0021] The above-mentioned point breaking device for a bag making machine can be further configured as follows: the roller cutter lifting drive source is a roller cutter lifting cylinder, the output end of the roller cutter lifting cylinder is connected to the roller cutter lifting plate, and drives the roller cutter lifting plate to move up and down axially.

[0022] By adopting the above technical solution, the output end of the hob lifting cylinder is connected to the hob lifting plate, and the hob lifting plate is driven to move up and down axially through the extension and contraction of the cylinder.

[0023] The above-mentioned point-breaking device for a bag-making machine can be further configured as follows: a pneumatic slitting knife holder is installed on the knife holder, a roller clamping opening groove is provided in the pneumatic slitting knife holder, a rolling shaft is provided at the center of the point-breaking roller, and the point-breaking roller is installed in the roller clamping opening groove through a transition fit of the rolling shaft and rotates.

[0024] By adopting the above technical solution, the setting of the pneumatic slitting knife holder can adjust the depth of the knife by turning the depth adjustment screw above, and accurately control the easy-to-tear effect. At the same time, the point-breaking hob is installed in the hob clamping opening groove through the transition fit of the rolling shaft, which is convenient for quick replacement and adjustment. The point-breaking hob can be quickly replaced by simply inserting and removing the point-breaking hob, achieving high-efficiency tool change and greatly improving processing efficiency. At the same time, the pneumatic slitting knife can control the up and down movement of the air knife by applying air pressure to the airbag, so that it can elastically retract when colliding with the dotting platform, protecting the point-breaking hob and further extending the service life of the point-breaking hob.

[0025] The above-mentioned point-breaking device for a bag-making machine can be further configured as follows: the knife holder driving mechanism includes synchronous wheels arranged on both sides of the point-breaking frame and a synchronous belt wound between the two synchronous wheels, one of the synchronous wheels is connected to a knife holder driving motor, the knife holder is slidably connected to the point-breaking frame through a transversely arranged knife holder slider rail structure, and the knife holder is connected to the synchronous belt.

[0026] By adopting the above technical solution, the structure of the synchronous wheel and synchronous belt provides a stable driving force, so that the tool holder can slide back and forth smoothly along the point-breaking frame, and can efficiently make points back and forth to quickly form an easy-to-tear edge. The horizontally arranged tool holder slider rail structure further improves the stability of the tool holder during horizontal sliding.

[0027] The above-mentioned point-breaking device for a bag-making machine can be further configured as follows: the knife holder driving mechanism includes synchronous wheels arranged on both sides of the point-breaking frame and a synchronous belt wound between the two synchronous wheels, wherein a knife holder driving motor is connected to one of the synchronous wheels, and the knife holder is slidingly connected to the point-breaking frame through a transversely arranged knife holder slider rail structure, and a synchronous belt pressure plate is provided on the knife holder, and a synchronous belt mounting groove for fixing the synchronous belt is formed between the synchronous belt pressure plate and the knife holder, and the knife holder is fixedly connected to the synchronous belt through the synchronous belt mounting groove.

[0028] By adopting the above technical solution, the structure of the synchronous wheel and the synchronous belt provides a stable driving force, so that the tool holder can slide back and forth smoothly along the point-breaking frame, and can efficiently make points back and forth to quickly form an easy-to-tear edge. The horizontally arranged tool holder slider rail structure further improves the stability of the tool holder during horizontal sliding. The synchronous belt mounting groove between the synchronous belt pressure plate and the tool holder forms a structure for fixing the synchronous belt, ensuring that the synchronous belt remains stable during high-speed movement.

[0029] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional schematic diagram of embodiment 1 of the present utility model.

[0031] Figure 2 This is an exploded view of the tool holder and the point-break hob according to Example 1 of the utility model.

[0032] Figure 3 The explosion of the cutter block and the point-breaking hob in the first embodiment of the utility model Figure 2 .

[0033] Figure 4 This is a structural schematic diagram of the tool holder, the point-breaking hob and the synchronous belt in Example 1 of the utility model.

[0034] Figure 5 This is a schematic diagram of the internal structure of the pneumatic slitting tool holder and the point-breaking hob in Example 1 of the utility model.

[0035] Figure 6 Schematic diagram of the internal structure of the pneumatic slitting tool holder and the point breaking hob in Example 1 of the utility model Figure 2 .

[0036] Figure 7 This is a structural diagram of the pneumatic slitting tool holder and the point-breaking hob in Example 2 of the utility model.

[0037] Figure 8 This is a three-dimensional schematic diagram of Example 3 of the present utility model.

[0038] Figure 9 It is a three-dimensional schematic diagram of the scraping device of Example 4 of the present utility model. Implementation Method

[0039] Example 1: Figures 1-6As shown, a point breaking device for a bag making machine includes a point breaking frame 1, a knife seat 2 and a knife seat driving mechanism for driving the knife seat 2 to slide back and forth laterally along the point breaking frame 1 are provided on the point breaking frame 1, a pneumatic slitting knife frame 3 is installed on the knife seat 2, a U-shaped hob clamping opening groove 31 is provided in the pneumatic slitting knife frame 3, a rolling bearing 41 is provided at the center of the point breaking hob 4, a stepped rolling shaft 42 is provided in the rolling bearing, and part of it extends to both ends of the point breaking hob 4, the point breaking hob 4 is installed in the hob clamping opening groove 31 through the transition fit of the rolling shaft 42 and rotates, and part of it extends out of the pneumatic slitting knife frame 3, which reduces friction and improves rotation efficiency while conveniently plugging and replacing the hob to improve efficiency. The point breaking frame 1 corresponds to one side of the point breaking hob 4 A dotting platform 5 is provided at the end, and the dotting platform 5 is preferably roller-shaped or square-shaped. The tool holder drive mechanism includes synchronous wheels 11 arranged on both sides of the dotting frame 1 and a synchronous belt 12 wound between the two synchronous wheels 11, one of the synchronous wheels 11 is connected to a tool holder drive motor 13, and the tool holder 2 is slidably connected to the dotting frame 1 through a transversely arranged tool holder slider slide rail structure 21, and a synchronous belt pressure plate 22 is provided on the tool holder 2. A synchronous belt mounting groove 23 for fixing the synchronous belt 12 is formed between the synchronous belt pressure plate 22 and the tool holder 2, and the tool holder 2 is fixedly connected to the synchronous belt 12 through the synchronous belt mounting groove 23. The tool holder drive motor 13 rotates back and forth in forward and reverse directions, driving the tool holder 2 on the synchronous belt 12 to slide back and forth laterally along the dotting platform 5.

[0040] like Figures 1-4 As shown, the knife holder 2 is provided with a knife lifting mechanism for driving the point-breaking hob 4 to approach or move away from the dotting platform 5. The knife lifting mechanism includes a knife lifting plate 6 arranged on the knife holder 2, and the pneumatic slitting knife holder 3 is installed on the knife lifting plate 6. The knife lifting plate 6 is slidably connected to the knife holder 2 through an axially arranged knife slider slide rail structure 61. A knife lifting motor 7 is provided on the knife holder 2, and the output end of the knife lifting motor 7 is connected to a knife lifting screw rod 71. The knife lifting plate 6 is provided with a knife lifting nut 62 threadedly connected to the knife lifting screw rod 71. The knife lifting motor 7 drives the knife lifting screw rod 71 to rotate, and the knife lifting plate 6 is linked to the axial lifting of the knife, so that the point-breaking hob 4 approaches or moves away from the dotting platform 5. At the same time, in order to eliminate the concentricity problem of the knife lifting motor 7 and the knife lifting screw rod 71, a coupling 72 is provided between the knife lifting screw rod 71 and the knife lifting motor 7 to achieve stable and convenient installation and fixation.

[0041] When the dotting device of this embodiment 1 is working, the continuous roll bag will move along the dotting platform 5, and then it will pause evenly to perform the dotting operation. At this time, the dotting cutter 4 staying above the two ends of the continuous roll bag will move down with the operation of the cutter lifting motor 7 and gently press against the surface of the dotting platform 5. At this time, the cutting edge of the tip of the dotting cutter 4 stays at a small section inside the end of the continuous roll bag, so that there is a reserved space between the cutting edge and the outer edge of the bag body where no hole will be punched. Then the knife seat drive motor 13 works, driving the synchronous belt 12 to drive the dotting cutter 4 to roll along the bag body to dot to form an easy-to-tear opening, and then when it reaches the distance The other side of the end of the continuous roll bag is moved up a little, so that there is a reserved space between the blade and the outer edge of the other side of the bag body that will not be punched, completing a U-shaped dotting trajectory. After the dot breaking is completed to form an easy-to-tear opening, there is reserved space at both ends of the bag body to avoid easy tearing. At the same time, the rolling dot breaking replaces the original lifting dot breaking method, which greatly reduces the wear of the blade, improves durability, reduces costs and increases efficiency. At the same time, the setting of the U-shaped hob clamping opening groove 31 allows the user to quickly replace the tool by simply inserting and removing the dot breaking hob 4 with pliers, which greatly improves the processing efficiency of the equipment.

[0042] Example 2: Figure 7 As shown, compared with Example 1, Example 2 cancels the hob lifting mechanism and only needs to provide at least one clearance gap 43 on the outer periphery of the point-breaking hob 4. According to the different widths of the bag body, point-breaking hobs 4 of different diameters are set to ensure that the point-breaking hob 4 rolls one circle just to mark the bag body, and the clearance gap 43 just corresponds to the required reserved space position at both ends of the bag body.

[0043] Example 3: Figure 8 As shown, compared with Example 1, the hob lift cylinder 8 of Example 3 replaces the hob lift motor 7, cancels the hob lift screw 71, the hob lift sleeve 62 and the coupling 72, and directly connects the output end of the hob lift cylinder 8 to the hob lift plate 6, thereby driving the hob lift plate 6 to move up and down axially.

[0044] Example 4: Figure 9 As shown, compared with Example 1, the dotting platform 5 of Example 4 is provided with a platform lifting mechanism for driving the dotting platform 5 to approach or move away from the dotting cutter 4. The platform lifting mechanism replaces the cutter lifting mechanism of Example 1. The platform lifting mechanism includes a platform lifting drive cylinder 9 arranged at both ends of the dotting platform 5 corresponding to the dotting frame 1. The platform lifting drive cylinder 9 drives the dotting platform 5 to approach or move away from the dotting cutter 4.

[0045] When the dot breaking device of this embodiment 4 is working, the continuous roll bag will move along the dot-marking platform 5, and then it will stop evenly to perform dot-breaking operations. At this time, the dot-breaking hob 4 staying above the continuous roll bag only needs to move laterally and does not need to move axially, and the platform lifting drive cylinder 9 will push the bag body upward to resist the dot-breaking hob 4. At this time, the blade position of the tip of the dot-breaking hob 4 stays at a small section inside the end of the continuous roll bag, so that there is a reserved space between the blade and the outer edge of the bag body where no hole will be punched. Then the knife seat drive motor 13 works, driving the synchronous belt 12 to drive the dot-breaking hob 4 to roll along the bag body to dot to form an easy-to-tear opening, and then when it reaches the other side of the end of the continuous roll bag The small section is moved up so that there is a reserved space between the blade and the outer edge of the other side of the bag body without punching. Then the platform lifting drive cylinder 9 will descend to separate the bag body from the point-breaking hob 4, which is convenient for the subsequent continuous roll bag feeding. After the point breaking is completed to form an easy-to-tear opening, there is a reserved space at both ends of the bag body to avoid easy tearing. At the same time, the rolling point breaking replaces the original lifting point breaking method, which greatly reduces the wear of the blade, improves durability, reduces costs and increases efficiency. At the same time, the setting of the U-shaped hob clamping opening groove 31 allows the user to quickly replace the tool by simply plugging and unplugging the point-breaking hob 4 with pliers, which greatly improves the processing efficiency of the equipment.

Claims

1. A point breaking device for a bag making machine, comprising a point breaking frame, characterized in that: The point breaking frame is provided with a tool holder loaded with a point breaking hob and a tool holder driving mechanism for driving the tool holder to slide back and forth along the point breaking frame. The point breaking hob is rotatably installed in the tool holder. The point breaking frame is provided with a dotting platform at one end corresponding to the point breaking hob. The tool holder driving mechanism is used to drive the point breaking hob to roll along the dotting platform.

2. The point breaking device for a bag making machine according to claim 1, characterized in that: The cutter seat is provided with a cutter lifting mechanism for driving the cutter to move closer to or away from the dotting platform.

3. The point breaking device for a bag making machine according to claim 1, characterized in that: The dotting platform is provided with a platform lifting mechanism for driving the dotting platform close to or away from the dotting cutter. The platform lifting mechanism includes at least one platform lifting driving source arranged on the dotting frame, and the platform lifting driving source drives the dotting platform close to or away from the dotting cutter.

4. The point breaking device for a bag making machine according to claim 1, characterized in that: At least one clearance gap is provided on the outer periphery of the point-breaking hob.

5. The point breaking device for a bag making machine according to claim 2, characterized in that: The hob lifting mechanism includes a hob lifting plate arranged on the cutter seat, the point-breaking hob is rotatably mounted on the hob lifting plate, the hob lifting plate is slidably connected to the cutter seat via an axially arranged hob slider rail structure, a hob lifting drive source is provided on the cutter seat, the hob lifting plate is connected to the output end of the hob lifting drive source, and as the hob lifting drive source works, the point-breaking hob is urged to approach or move away from the dotting platform.

6. The point breaking device for a bag making machine according to claim 5, characterized in that: The hob lifting drive source is a hob lifting motor, the output end of the hob lifting motor is connected to a hob lifting screw, the hob lifting plate is provided with a hob lifting nut threadedly connected to the hob lifting screw, the hob lifting motor drives the hob lifting screw to rotate, and the hob lifting plate is linked to axial lifting.

7. The point breaking device for a bag making machine according to claim 5, characterized in that: The hob lift driving source is a hob lift cylinder, the output end of the hob lift cylinder is connected to the hob lift plate, and drives the hob lift plate to move up and down axially.

8. A point breaking device for a bag making machine according to any one of claims 1 to 7, characterized in that: A pneumatic slitting tool holder is installed on the tool holder, a hob clamping opening groove is provided in the pneumatic slitting tool holder, a rolling shaft is provided at the center of the point-breaking hob, and the point-breaking hob is installed in the hob clamping opening groove and rotates through a transition fit of the rolling shaft.

9. A point breaking device for a bag making machine according to any one of claims 1 to 7, characterized in that: The tool holder drive mechanism includes synchronous wheels arranged on both sides of the point breaking frame and a synchronous belt wound between the two synchronous wheels, one of the synchronous wheels is connected to a tool holder drive motor, the tool holder is slidably connected to the point breaking frame through a transversely arranged tool holder slider rail structure, and the tool holder is connected to the synchronous belt.

10. The point breaking device for a bag making machine according to claim 8, characterized in that: The tool holder driving mechanism includes synchronous wheels arranged on both sides of the point breaking frame and a synchronous belt wound between the two synchronous wheels, one of the synchronous wheels is connected to a tool holder driving motor, the tool holder is slidingly connected to the point breaking frame through a transversely arranged tool holder slider rail structure, a synchronous belt pressure plate is provided on the tool holder, and a synchronous belt mounting groove for fixing the synchronous belt is formed between the synchronous belt pressure plate and the tool holder, and the tool holder is fixedly connected to the synchronous belt through the synchronous belt mounting groove.

Images