Rolling bag cutting mechanism convenient for cutter replacement

Abstract

The utility model relates to a rolling bag cutting mechanism convenient for cutter replacement, which belongs to the field of bag making machines and comprises a cross beam frame body, a heat sealing component, a cold cutting component and an assembling accessory, the cross beam frame body is of a frame type box beam structure, and two ends of the cross beam frame body are respectively connected to a large side plate of a bag making machine. Base parts of the heat sealing assembly and the cold cutting assembly are mounted on the top surface of the cross beam frame body, a rear vertical pilaster is arranged on the rear side of the top surface of the cross beam frame body, the rear vertical wall of the rear vertical pilaster is a mounting surface, and the upper part of the cold cutting assembly is mounted on the rear vertical wall of the rear vertical pilaster through the assembling accessory; the cold cutting assembly is a pricking knife assembly or a cutting knife assembly. According to the utility model, the interchange of the pricking knife assembly and the cutter assembly is facilitated, and the rerouting operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bag making machines, in particular to a roll bag cutting mechanism which is convenient for changing knives. Background Art

[0002] Plastic film shopping bags are usually used in supermarkets or shopping malls to package fresh produce, vegetables and other scattered goods. These film shopping bags are usually rolled into a roll with the ends connected, so they are also called roll bags. A sealing line and a breaking line are set between two adjacent bags, so that when the bag is torn, one end of the bag is sealed and the other end is open, which is convenient for storing fresh produce and vegetables.

[0003] When producing continuous roll bags, the existing bag-making machines often use the heat-sealing knife and the cold-cutting knife to move synchronously to complete the processing of the sealing line and the breakpoint line. However, the existing plastic film shopping bags are divided into degradable plastic film and ordinary plastic film. For ordinary plastic film, due to its low elasticity, the industry generally uses serrated piercing blades to make breakpoint lines. For degradable plastic film, its elasticity is higher. If the serrated piercing blade is not sharp enough, it will not be able to completely make the breakpoint line. Therefore, it is necessary to use an upper and lower cutting knife with a serrated seam to make it. However, for a bag-making machine production line, the bag-making factory often needs to be able to process both materials to save equipment investment. Therefore, once the plastic film material is switched, it is necessary to interchange the piercing knife assembly and the cutting knife assembly. The existing bag-making machine is more troublesome to interchange, and it is often necessary to replace the entire knife frame part outside the knife assembly to achieve it. It requires a high level of technical skills from the equipment personnel, and the replacement time is long, which is time-consuming and labor-intensive.

[0004] Therefore, it is necessary to develop a continuous roll bag cutting mechanism that is easy to change the knife to overcome the above-mentioned defects. Utility Model Content

[0005] The utility model aims to provide a continuous roll bag cutting mechanism which is convenient for changing knives, is convenient for exchanging a tying knife assembly and a cutting knife assembly, and improves the efficiency of line changing operation.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model discloses a continuous roll bag cutting mechanism which is convenient for changing knives, comprising a crossbeam frame, a heat sealing component, a cold cutting component and matching accessories, wherein the crossbeam frame is a frame-type box beam structure, the two ends of the crossbeam frame are respectively connected to the large side plates of a bag making machine, the top surface of the crossbeam frame is installed with the base parts of the heat sealing component and the cold cutting component, the rear side of the top surface of the crossbeam frame is provided with a rear vertical wall column, the rear vertical wall of the rear vertical wall column is the mounting surface, the upper part of the cold cutting component is installed on the rear vertical wall of the rear vertical wall column through the matching accessories; the cold cutting component is a piercing knife component or a cutting knife component.

[0008] Furthermore, the number of the rear wall columns is three, and two sets of the piercing knife assemblies or two sets of the cutting knife assemblies are installed between the three rear wall columns.

[0009] Furthermore, the crossbeam frame is integrally cast by using ductile iron or grey cast iron.

[0010] Furthermore, sliders are respectively provided at both ends of the upper frame of the piercing knife assembly, and the mounting accessories include side clamps, middle clamps and linear guides; a clamping groove is vertically opened on the rear wall of the rear wall column, and a plurality of first threaded holes are opened on the bottom surface of the clamping groove, and the front ends of the two side clamps are respectively inserted into the clamping grooves of the rear wall columns on both sides and are connected to the first threaded holes for fixing through countersunk hole mounting bolts, and the corresponding middle clamps are installed on the middle rear wall column; the number of the linear guides is four, which are respectively vertically fixed on the side walls opposite to the side clamps and the middle clamps, and the sliders are slidably fitted on the linear guides.

[0011] Furthermore, both ends of the upper frame of the cutting knife assembly are respectively arranged as sliding ends, and the mounting accessories include a side slide groove part and a middle slide groove part, the side slide groove part has an L-shaped cross-section, and the middle slide groove part has a T-shaped cross-section; the two side slide groove parts are threadedly connected to the second threaded holes on the rear walls of the rear wall columns on both sides through countersunk bolts, and the middle slide groove part is connected to the rear wall of the middle rear wall column; the sliding ends at both ends of the cutting knife assembly are vertically slidably connected in the opposite grooves of the side slide groove part and the middle slide groove part.

[0012] Furthermore, the mounting accessories also include a pad, which is mounted on the side walls of the slots of the side slide member and the middle slide member by countersunk screws, and the pad is in sliding contact with the sliding end.

[0013] Furthermore, a leather shaft mounting table is also provided on the top front portion of the crossbeam frame, the number of the leather shaft mounting tables is more than two, and a leather shaft seat for supporting the conveying leather shaft is installed on the leather shaft mounting table.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] The utility model discloses a continuous roll bag cutting mechanism that is easy to change knives. By setting an integrally formed crossbeam frame to install a heat sealing component and a cold cutting component, the relative relationship between the two is relatively stable, that is, the spacing between the sealing line and the breakpoint line on the plastic film strip is uniform and consistent; by selecting the rear vertical wall of the crossbeam frame as the installation interface surface, matching the corresponding mounting accessories to interchange the piercing knife component and the cutting knife component, the number of parts that need to be disassembled and assembled is reduced, the workload is reduced, and the spacing size of multiple rear vertical wall columns of the same crossbeam frame is stable and unchanged, saving installation and debugging time. The utility model discloses a continuous roll bag cutting mechanism that is easy to change knives. It is easy to interchange the piercing knife component and the cutting knife component, and improves the efficiency of line modification operations.

[0016] In addition, by setting three rear wall columns, two sets of cold cutting components can be installed and supported, which is suitable for cold cutting of breakpoint lines in double-line bag making machines. The upper part of the knife assembly is installed by the slider and the linear guide, which can meet the reciprocating motion accuracy requirements. It only needs to install the side card plate and the middle card plate at the rear of the crossbeam frame to achieve quick installation. The card slot is used for positioning to meet the installation accuracy requirements and reduce the adjustment time. The upper part of the cutter assembly is guided up and down by the side slide and the middle slide in cooperation with the sliding end. The guiding accuracy is high, and there will be no collision between the bottom knife and the upper cutter or the problem of too loose incision. By adding a pad on the side wall of the notch of the side slide and the middle slide, the wear resistance is improved and the service life is increased. The conveying leather shaft is installed by installing the leather shaft seat on the leather shaft installation table. Compared with the original model that uses the large side plate, the middle support plate and the bearing seat of the bag making machine to install the conveying leather shaft, the integral crossbeam frame ensures the consistency of the installation reference and improves the running stability of the conveying leather shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the main structure of the continuous roll bag cutting mechanism that is easy to change the knife in the utility model;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the continuous roll bag cutting mechanism which is convenient for knife change in the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle AA part;

[0021] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB part;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the beam frame of the utility model;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the piercing knife assembly of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the utility model when the piercing knife assembly is installed;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the cutter assembly of the utility model;

[0026] Fig. 9 This is a schematic diagram of the structure of the utility model when the cutter assembly is installed.

[0027] Explanation of the reference numerals: 1. beam frame; 101. rear wall column; 102. clamping groove; 103. first threaded hole; 104. second threaded hole; 105. first through hole; 106. leather shaft mounting table; 2. conveying leather shaft; 201. pulley; 202. leather shaft seat; 3. heat sealing assembly; 301. heat sealing knife; 4. piercing knife assembly; 401. piercing knife base; 402. crimping plate; 403. piercing blade; 404. slider; 405. first driving pin; 5. cutter assembly; 501. cutter bottom knife; 502. upper cutter; 503. sliding end; 504. second driving pin; 6. side clamping plate; 7. middle clamping plate; 8. side slide groove member; 9. middle slide groove member; 10. linear guide rail; 11. pad. DETAILED DESCRIPTION

[0028] The core of the utility model is to provide a continuous roll bag cutting mechanism which is convenient for changing knives, and is convenient for exchanging the tying knife assembly and the cutting knife assembly, thereby improving the efficiency of line changing operation.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] With reference to the accompanying drawings, Figure 1This is a schematic diagram of the main structure of the continuous roll bag cutting mechanism that is easy to change the knife in the utility model; Figure 2 It is a three-dimensional structural schematic diagram of the continuous roll bag cutting mechanism which is convenient for knife change in the utility model; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle AA part; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB part;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the beam frame of the utility model; Figure 6 This is a schematic diagram of the three-dimensional structure of the piercing knife assembly of the utility model; Figure 7 This is a schematic diagram of the structure of the utility model when the piercing knife assembly is installed; Figure 8 This is a schematic diagram of the three-dimensional structure of the cutter assembly of the utility model; Fig. 9 This is a schematic diagram of the structure of the utility model when the cutter assembly is installed.

[0033] In a specific embodiment, Figures 1 to 9 As shown, the roll bag cutting mechanism of the utility model, which is convenient for knife change, comprises a crossbeam frame 1, a heat sealing assembly 3, a cold cutting assembly and matching accessories. The crossbeam frame 1 is a frame-type box beam structure, and the two ends of the crossbeam frame 1 are respectively connected to the large side plates of the bag making machine. The connection method here can be a bolt fixed connection or an adjustable height connection method with a vertical slide rail groove. The heat sealing assembly 3 and the base part of the cold cutting assembly are installed on the top surface of the crossbeam frame 1, and the heat sealing assembly 3 is arranged in parallel in front of the cold cutting assembly. The heat sealing knife 301 of the heat sealing assembly 3 processes the plastic film bag in front of the cold cutting assembly to form a sealing line. A rear vertical wall column 101 is arranged on the rear side of the top surface of the crossbeam frame 1, and the rear vertical wall of the rear vertical wall column 101 is an installation surface, that is, an installation interface surface. The upper part of the cold cutting assembly is also the part that moves back and forth up and down, and this part is installed on the rear vertical wall of the rear vertical wall column 101 through the matching accessories. The cold cutting assembly is a knife assembly 4 or a knife assembly 5.

[0034] Specifically, if Figure 3 and Figure 6 As shown, the piercing knife assembly 4 includes a piercing knife base 401, a crimping plate 402 and a piercing blade 403. The piercing knife base 401 is formed together with the knife seat of the heat sealing assembly 3. The piercing knife base 401 is provided with a knife groove at the position of the serrated piercing blade 403. The piercing knife base 401 is provided with a rubber strip groove and equipped with a rubber leather strip at the corresponding position of the crimping plate 402. The two crimping plates 402 are arranged in parallel at the front and rear sides of the piercing blade 403, which can ensure that the two sides of the piercing blade 403 are pressed tightly when processing the breakpoint line, thereby ensuring the piercing effect.

[0035] Specifically, if Figure 4 and Figure 8As shown, the cutter assembly 5 includes a cutter bottom knife 501 and an upper cutter 502. The cutter bottom knife 501 is installed on the rear side of the knife holder of the heat sealing assembly 3. The upper cutter 502 can move up and down and cooperate with the cutter bottom knife 501 to form a guillotine-type cutting. Because the cutter bottom knife 501 is provided with a serrated seam, a breakpoint line can also be processed.

[0036] Specifically, if Figure 5 As shown, the crossbeam frame 1 is integrally formed by casting with ductile iron or grey cast iron.

[0037] By setting up an integrally formed crossbeam frame 1 to install the heat sealing component 3 and the cold cutting component, the relative relationship between the two is relatively stable, that is, the spacing between the sealing line and the breakpoint line on the plastic film strip is uniform and consistent; by selecting the rear wall of the rear vertical column 101 of the crossbeam frame 1 as the installation interface surface, matching the corresponding matching accessories to exchange the piercing knife component 4 and the cutting knife component 5, the number of parts that need to be disassembled and assembled is reduced, the workload is reduced, and the spacing size of multiple rear vertical wall columns 101 of the same crossbeam frame 1 is stable and unchanged, saving installation and debugging time. The utility model is convenient for changing knives and cutting bag cutting mechanism, which is convenient for exchanging the piercing knife component 4 and the cutting knife component 5, and improves the efficiency of line change operation.

[0038] In a specific embodiment of the present invention, Figure 1 , Figure 2 , Figure 5 , Figure 7 and Fig. 9 As shown, the number of the rear wall columns 101 is three, and the three rear wall columns 101 are arranged at equal intervals, and two sets of piercing knife assemblies 4 or two sets of cutting knife assemblies 5 are installed between them.

[0039] By arranging three rear wall columns 101, two sets of cold cutting components can be installed and supported, which is suitable for cold cutting of breakpoint lines of a double-line bag making machine.

[0040] In a specific embodiment of the present invention, Figure 6 and Figure 7As shown, the upper frame of the piercing knife assembly 4 is respectively provided with a slider 404 at both ends, and the bottom end of the upper frame is installed with a first driving pin 405, and the first driving pin 405 is connected to the driving connecting rod. Corresponding to the piercing knife assembly 4, the fitting accessories include a side clamping plate 6, a middle clamping plate 7 and a linear guide 10. A clamping groove 102 is vertically provided on the rear wall of the rear wall column 101, and a plurality of first threaded holes 103 are centrally provided on the bottom surface of the clamping groove 102. The front ends of the two side clamping plates 6 are respectively inserted into the clamping grooves 102 of the rear wall columns 101 on both sides and are connected to the first threaded holes 103 by countersunk hole mounting bolts for fixing. The corresponding middle clamping plate 7 is installed on the middle rear wall column 101 in the same way. The number of the linear guide 10 is four, which are respectively vertically fixed on the side walls opposite to the side clamping plate 6 and the middle clamping plate 7, and the slider 404 is slidably matched on the linear guide 10.

[0041] The upper part of the piercing knife assembly 4 is installed by cooperating with the slider 404 and the linear guide rail 10, which can meet the reciprocating motion accuracy requirements. It only needs to install the side clamping plate 6 and the middle clamping plate 7 behind the beam frame 1 to achieve quick installation. The clamping groove 102 is used for positioning to meet the installation accuracy requirements and reduce the adjustment time.

[0042] In a specific embodiment of the present invention, Figure 8 and Fig. 9 As shown, the two ends of the upper frame of the cutter assembly 5 are respectively set as sliding ends 503, and the fitting accessories include a side slide member 8 and a middle slide member 9, the side slide member 8 has an L-shaped cross section, and the middle slide member 9 has a T-shaped cross section. The two side slide members 8 are threadedly connected to the second threaded holes 104 on the rear walls of the rear wall columns 101 on both sides by countersunk bolts, and the middle slide member 9 is connected to the rear wall of the middle rear wall column 101. A C-shaped notch is formed between the side slide member 8 and the back of the rear wall column 101, and two back-to-back C-shaped notches are formed between the middle slide member 9 and the back of the rear wall column 101. The sliding ends 503 at both ends of the cutter assembly 5 are vertically slidably connected in the opposite notches of the side slide member 8 and the middle slide member 9.

[0043] Specifically, the mounting accessories further include a backing plate 11, which is mounted on the side walls of the slots of the side slide member 8 and the middle slide member 9 by countersunk screws, and the backing plate 11 is in sliding contact with the sliding end 503. The backing plate 11 is specifically made of a cast iron plate or a tin bronze plate with good wear resistance.

[0044] The upper portion of the cutter assembly 5 is guided up and down by the side slide 8 and the middle slide 9 in cooperation with the sliding end 503, and the guiding precision is high, and the problem of collision between the cutter bottom knife 501 and the upper cutter 502 or loose cuts will not occur. By adding a pad 11 to the side wall of the notch of the side slide 8 and the middle slide 9, the wear resistance is improved and the service life is increased.

[0045] It should be noted that Figures 1 to 4 In order to make it easier to express, the applicant mixed the piercing knife assembly 4 and the cutting knife assembly 5, and the corresponding accessories were also mixed. In reality, the bag making machine can only process one type of plastic film strip, and either two sets of piercing knife assemblies 4 or two sets of cutting knife assemblies 5 are installed at the same time, and there will be no mixing and mixing. Figures 1 to 4 This is only for convenience of presentation and cannot be regarded as evidence against this application.

[0046] In a specific embodiment of the present invention, Figures 3 to 5 As shown, the top front of the crossbeam frame 1 is also provided with a leather shaft mounting table 106, and corresponding threaded mounting holes are provided on the leather shaft mounting table 106. There are more than two leather shaft mounting tables 106, and the leather shaft seat 202 for supporting the conveying leather shaft 2 is installed on the leather shaft mounting table 106.

[0047] The conveying leather shaft 2 is installed by installing the leather shaft seat 202 through setting the leather shaft installation table 106. Compared with the original model that uses the large side plate, middle support plate and bearing seat of the bag making machine to install the conveying leather shaft 2, the integral crossbeam frame 1 ensures the consistency of the installation reference and improves the operating stability of the conveying leather shaft 2.

[0048] The utility model is convenient for changing the blade of the continuous roll bag cutting mechanism. The process of changing the line is explained by taking the switching of the raw material ordinary plastic film to the degradable plastic film as an example. The bag making machine is stopped and the emergency stop button is pressed, and the operator disassembles the two sets of piercing knife assemblies 4 from the rear side of the crossbeam frame 1. First, the lower cross guard bar is removed from the side clamping plate 6, and the first driving pin 405 is removed to make it separate from the upper part frame of the piercing knife assembly 4. The upper part of the piercing knife assembly 4 is hoisted from above to make it disengage from the linear guide rail 10 and transferred to the placement rack. After the upper parts of the two piercing knife assemblies 4 are hoisted away, the side clamping plate 6 and the middle clamping plate 7 are opened for disassembly, and the linear guide rail 10 does not need to be disassembled. The bolt on the first through hole 105 is removed to remove the knife seat part corresponding to the piercing knife assembly 4, and the knife seat part corresponding to the upper cutting knife assembly 5 is replaced and locked with bolts through the first through hole 105 from below. The cutting knife bottom knife 501 is installed on the rear side of the knife seat with a countersunk screw. The two side slide members 8 and one middle slide member 9 are installed by threading them into the second threaded hole 104 on the rear wall of the rear wall column 101 with countersunk bolts. The backing plate 11 is installed on the side walls of the slots of the side slide members 8 and the middle slide member 9 with countersunk screws, and the upper part of the hoisting cutter assembly 5 is put into place, that is, the sliding ends 503 at both ends are inserted into the slots of the side slide members 8 and the middle slide member 9. The second driving pin 504 at the bottom end of the upper frame of the cutter assembly 5 is connected to the connecting rod drive mechanism. The trial run is carried out to observe whether it can move smoothly and the quality of the cutting breakpoint line is good. If it is qualified, the line change operation is completed.

[0049] In summary, by setting an integrally formed crossbeam frame 1 to install the heat sealing component 3 and the cold cutting component, the relative relationship between the two is relatively stable, that is, the spacing between the sealing line and the breakpoint line on the plastic film strip is uniform; by selecting the rear wall of the rear vertical wall column 101 of the crossbeam frame 1 as the installation interface surface, matching the corresponding mounting accessories to interchange the piercing knife component 4 and the cutting knife component 5, the number of parts that need to be disassembled and assembled is reduced, the workload is reduced, and the spacing size of multiple rear vertical wall columns 101 of the same crossbeam frame 1 is stable and unchanged, saving installation and debugging time. The utility model is a continuous roll bag cutting mechanism that is easy to change knives, and is easy to interchange the piercing knife component 4 and the cutting knife component 5, which improves the efficiency of line change operations. By setting three rear vertical wall columns 101, two sets of cold cutting components can be installed and supported, which is suitable for cold cutting of breakpoint lines on double-line bag making machines. The upper part of the piercing knife assembly 4 is installed by cooperating with the slider 404 and the linear guide 10, which can meet the reciprocating motion accuracy requirements. It only needs to install the side clamping plate 6 and the middle clamping plate 7 behind the crossbeam frame 1 to achieve quick installation. The clamping groove 102 is used for positioning to meet the installation accuracy requirements and reduce the adjustment time. The upper part of the cutting knife assembly 5 is guided up and down by cooperating with the sliding end 503 through the side slide groove part 8 and the middle slide groove part 9. The guiding accuracy is high, and there will be no collision between the bottom cutter 501 and the upper cutter 502 or the problem of too loose incision. By adding a pad 11 on the side wall of the notch of the side slide groove part 8 and the middle slide groove part 9, the wear resistance is improved and the service life is increased. The conveying leather shaft 2 is installed by installing the leather shaft seat 202 through setting the leather shaft installation table 106. Compared with the original model that uses the large side plate, middle support plate and bearing seat of the bag making machine to install the conveying leather shaft 2, the integral crossbeam frame 1 ensures the consistency of the installation reference and improves the operating stability of the conveying leather shaft 2.

[0050] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0051] It should be noted that all components in the technical solution of this application require the necessary additional facilities of water supply, oil supply, electricity supply and gas supply to be driven and / or controlled. If there is no further explanation, it is assumed that the existing technology is used and equipped without special explanation.

[0052] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A roll bag cutting mechanism that is easy to change blades, characterized in that: The invention comprises a crossbeam frame (1), a heat sealing component (3), a cold cutting component and matching accessories, wherein the crossbeam frame (1) is a frame-type box beam structure, and the two ends of the crossbeam frame (1) are respectively connected to the large side panels of the bag making machine, and the base parts of the heat sealing component (3) and the cold cutting component are installed on the top surface of the crossbeam frame (1), and a rear wall column (101) is arranged on the rear side of the top surface of the crossbeam frame (1), and the rear wall of the rear wall column (101) is a mounting surface, and the upper part of the cold cutting component is installed on the rear wall of the rear wall column (101) through the matching accessories; the cold cutting component is a knife assembly (4) or a knife assembly (5).

2. The roll bag cutting mechanism with convenient knife change according to claim 1, characterized in that: The number of the rear wall columns (101) is three, and two sets of the piercing knife assemblies (4) or two sets of the cutting knife assemblies (5) are installed between the three rear wall columns (101).

3. The roll bag cutting mechanism with convenient knife change according to claim 1, characterized in that: The crossbeam frame (1) is integrally cast using ductile iron or grey cast iron.

4. The roll bag cutting mechanism with convenient knife change according to claim 2, characterized in that: Slide blocks (404) are respectively arranged at both ends of the upper frame of the knife assembly (4), and the mounting accessories include side clamps (6), middle clamps (7) and linear guide rails (10); a clamping groove (102) is vertically opened on the rear wall of the rear wall column (101), and a plurality of first threaded holes (103) are opened on the bottom surface of the clamping groove (102); the front ends of the two side clamps (6) are respectively inserted into the clamping grooves (102) of the rear wall columns (101) on both sides and are connected to the first threaded holes (103) for fixing through countersunk hole mounting bolts, and the corresponding middle clamps (7) are installed on the middle rear wall column (101); the number of the linear guide rails (10) is four and they are respectively vertically fixed on the opposite side walls of the side clamps (6) and the middle clamps (7), and the slide blocks (404) are slidably matched on the linear guide rails (10).

5. The roll bag cutting mechanism with convenient knife change according to claim 2, characterized in that: The two ends of the upper frame of the cutter assembly (5) are respectively arranged as sliding ends (503), and the mounting accessories include a side slide member (8) and a middle slide member (9), the side slide member (8) has an L-shaped cross section, and the middle slide member (9) has a T-shaped cross section; the two side slide members (8) are threadedly connected to the second threaded holes (104) on the rear walls of the rear wall columns (101) on both sides through countersunk bolts, and the middle slide member (9) is connected to the rear wall of the middle rear wall column (101); the sliding ends (503) at both ends of the cutter assembly (5) are vertically slidably connected to the opposite notches of the side slide member (8) and the middle slide member (9).

6. The roll bag cutting mechanism with convenient knife change according to claim 5, characterized in that: The mounting accessories also include a backing plate (11), which is mounted on the side walls of the slots of the side slide member (8) and the middle slide member (9) by countersunk screws, and the backing plate (11) is in sliding contact with the sliding end portion (503).

7. The roll bag cutting mechanism with convenient knife change according to claim 1, characterized in that: The top front portion of the crossbeam frame (1) is also provided with a leather shaft mounting table (106), the number of the leather shaft mounting tables (106) is more than two, and a leather shaft seat (202) for supporting the conveying leather shaft (2) is installed on the leather shaft mounting table (106).

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