Longitudinal cutting device

Abstract

The utility model discloses a longitudinal cutting device which comprises a cross beam and a longitudinal cutting assembly, the longitudinal cutting assembly comprises a base, the base is connected to the cross beam in a sliding mode through a transmission mechanism, the base slides in a reciprocating mode in the length direction of the cross beam, a knife rest is movably connected to the base, a longitudinal cutting knife is connected to the knife rest, a movable block is arranged on the base, and the movable block is connected to the longitudinal cutting knife. The movable block is slidably connected to the base through the driving mechanism, the driving mechanism comprises a rotating block, a transmission set and a driving part, the rotating block is rotatably connected to the base through the transmission set and driven by the driving part to rotate, a sliding way is arranged on the surface of the rotating block, and the movable block is slidably matched in the sliding way. And the movable block is connected with the knife rest through a connecting piece. The longitudinal cutting device provided by the utility model is high in longitudinal cutting precision, high in stability and high in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of carton forming machines, in particular to a longitudinal cutting device. Background Art

[0002] Cartons are the most widely used packaging products, usually used as wrappers for goods or outer protectors for items. A carton packaging machine is also called a carton forming machine or a carton unpacking machine. Its longitudinal cutting device is an essential part. The main components of the current longitudinal cutting devices on the market include a base, a tool rest, a driving structure and a longitudinal cutting knife. The tool rest is rotatably connected to the base, the longitudinal cutting knife is rotatably connected to the tool rest, and the longitudinal cutting knife is rotated by the driving structure. Usually, a stretching structure, such as an electric telescopic rod, is provided between the tool rest and the base to pull the tool rest to swing back and forth along the base, thereby driving the longitudinal cutting knife to move up and down to control the operation and cutting depth of the longitudinal cutting knife. However, by controlling the swing of the tool rest through the stretching rod, due to the inertia of the stretching rod, the swing of the tool rest is not stable enough, and finally the longitudinal cutting knife is unstable during longitudinal cutting, and the up and down movement of the longitudinal cutting knife cannot be accurately controlled. Summary of the Utility Model

[0003] The purpose of the utility model is to design a longitudinal cutting device to solve the above-mentioned technical deficiencies.

[0004] The utility model provides a longitudinal cutting device, which includes a cross beam and a longitudinal cutting assembly. The longitudinal cutting assembly includes a base. The base is slidably connected to the cross beam through a transmission mechanism. The base reciprocally slides along the length direction of the cross beam. A tool rest is movably connected to the base. A longitudinal cutting knife is connected to the tool rest. An active block is provided on the base. The active block is slidably connected to the base through a driving mechanism. The driving mechanism includes a rotating block, a transmission group and a driving member. The rotating block is rotatably connected to the base through the transmission group. The rotating block rotates under the drive of the driving member. A slideway is provided on the surface of the rotating block. The active block is slidably fitted in the slideway. The active block and the tool rest are connected through a connecting member.

[0005] Preferably, the transmission mechanism includes a rack structure fixed to the cross beam and extending along the length direction of the cross beam. A gear structure cooperating with the rack structure is provided on the base. A first driving source for driving the rotation of the gear structure is further provided on the base.

[0006] Further optimized, the base includes a horizontal base and an L-shaped base. The L-shaped base is inversely connected above the horizontal base. A fixed seat is connected below the horizontal base. The tool rest is rotatably connected to the fixed seat. The gear structure and the first driving source are installed on the horizontal part of the L-shaped base. The sliding block is installed on the vertical part of the L-shaped base.

[0007] Preferably, the transmission mechanism includes a belt fixed to the cross beam and distributed along the length direction of the cross beam. A fixed block is provided on the belt and driven by the belt. A second driving source is provided on the fixed block, and the second driving source has a telescopic end. A positioning block is provided on the base, and a positioning hole for inserting the telescopic end is provided on the positioning block, so that the fixed block and the positioning block are positioned to drive the base to move by the fixed block. A position sensor for sensing the position of the positioning block is also provided on the fixed block.

[0008] Further optimized, the transmission mechanism is a lead screw pair structure. The lead screw pair structure includes a lead screw fixed to the cross beam and distributed along the length direction of the cross beam. A nut is slidably fitted on the lead screw, the base is connected to the nut, and a third driving source for driving the lead screw to rotate is provided on the cross beam.

[0009] Further optimized, a guiding mechanism is further provided between the cross beam and the base. The guiding mechanism includes a slide rail fixed to the cross beam and extending along the moving direction of the base. A sliding block slidably fitted with the slide rail is provided on the base.

[0010] Preferably, the longitudinal cutting knife is an active longitudinal cutting knife, that is, the longitudinal cutting knife is driven by a driving structure to rotate automatically.

[0011] Preferably, the longitudinal cutting knife is a passive longitudinal cutting knife, that is, the longitudinal cutting knife is movably connected to the tool rest. When the longitudinal cutting knife presses down and contacts the cardboard, the longitudinal cutting knife is driven to rotate by the movement of the cardboard; or the longitudinal cutting knife is fixedly connected to the tool rest, the longitudinal cutting knife is fixed relative to the tool rest, and the longitudinal cutting knife presses down and inserts into the cardboard to form a longitudinal cut.

[0012] Further optimized, a second driven wheel and a second driving wheel are provided on the tool rest. The second driven wheel and the second driving wheel are arranged front and back along the tool rest. The second driving wheel is connected to the tool rest, the longitudinal cutting knife is connected to the second driven wheel, and the second driving wheel drives the second driven wheel to rotate, so that the longitudinal cutting knife cuts as an active longitudinal cutting knife.

[0013] Further optimized, a tension wheel is provided on the tool rest between the second driving wheel and the second driven wheel. A shaft body is provided on the tool rest, the tension wheel is sleeved on the shaft body, a kidney-shaped hole is opened on the tool rest, and the shaft body is movably connected in the kidney-shaped hole and can adjust its position along the length direction of the kidney-shaped hole.

[0014] Further optimized, both ends of the rotating block are rotatably connected to the base through pin shafts. The transmission group includes a first driving wheel and a first driven wheel. The first driving wheel is connected to the output end of the driving member, the first driven wheel is connected to the pin shaft, the first driving wheel and the first driven wheel are meshed with each other, and a coupling is provided on the pin shaft between the first driven wheel and the rotating block.

[0015] For further optimization, a pressing piece is arranged at the bottom of the tool rest along the front-back direction, and the front end of the pressing piece is bent upward. In the working state, the bottom surface of the pressing piece moves with the tool rest to press the upper surface of the cardboard; or the pressing piece is arranged on the fixed seat and is located below the tool rest.

[0016] For further optimization, the number of the longitudinal cutting assemblies is two or more, and they are arranged in parallel along the length direction of the cross beam. A connecting shaft is arranged below the cross beam, and the second driving wheels of the longitudinal cutting assemblies are sequentially sleeved on the connecting shaft, so that the connecting shaft drives all the second driving wheels to rotate synchronously.

[0017] The technical effect of the utility model is that the longitudinal cutting tool assembly includes a base, an activity block is arranged on the base, and the activity block can make a reciprocating movement in the front-back direction along the base through a driving mechanism. A telescopic pull rod is arranged between the activity block and the tool rest, that is, the pull rod drives the tool rest to swing by pulling through the activity block. The driving mechanism mainly includes a rotating block and a gear set. The rotating block is rotatably connected to the base, and an axially spiral slide way is arranged on the outer circumference of the rotating block. The activity block is in sliding fit with the slide way. When the rotating block rotates, it drives the activity block to make an axial translation, so that the activity block can make a stable axial translation, and thus drives the tool rest to swing stably through the pull rod, so that the longitudinal cutting tool can move up and down stably, greatly improving the precision and stability of longitudinal cutting; multiple longitudinal cutting tool assemblies are arranged in parallel along the length direction of the cross beam, and each longitudinal cutting assembly is correspondingly provided with a first driving source, that is, each longitudinal cutting assembly can be reciprocally adjusted in position along the length direction of the cross beam alone, greatly improving the longitudinal cutting efficiency. Description of the Drawings

[0018] Figure 1 is the overall structure diagram;

[0019] Figure 2 is the structure diagram of the longitudinal cutting assembly;

[0020] Figure 3 is the structure diagram of the longitudinal cutting assembly from another perspective;

[0021] Figure 4 is the side view structure diagram of the longitudinal cutting assembly;

[0022] Figure 5 is the structure diagram of the longitudinal cutting assembly from another perspective;

[0023] Figure 6 is the structure diagram of the embodiment with the transmission structure being belt transmission;

[0024] Figure 7 is the structure diagram of the embodiment with the transmission structure being ball screw pair transmission.

[0025] In the figure: 1, base; 1-1, horizontal base; 1-2, L-shaped base; 2, tool rest; 3, longitudinal cutting tool; 4, movable block; 5, rotating block; 5-1, slideway; 5-2, pin shaft; 6, driving member; 7, pull rod; 8, gear set; 8-1, first driving wheel; 8-2, first driven wheel; 9, coupling; 10, slider; 11, guide rail; 12, second driven wheel; 13, second driving wheel; 14, tensioning wheel; 15, shaft body; 16, kidney-shaped hole; 17, fixed seat; 18, pressing piece; 19, cross beam; 20, connecting shaft; 21, rack structure; 22, gear structure; 23, first driving source; 24, slide rail; 25, sliding block;

[0026] 26, belt; 27, fixed block; 28, second driving source; 29, positioning block; 30, position sensor;

[0027] 31, lead screw; 32, nut; 33, third driving source. Detailed implementation manner

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0029] The utility model includes a cross beam 19 and a longitudinal cutting assembly. The longitudinal cutting assembly includes a base 1. The base 1 includes a horizontal base 1-1 and an L-shaped base 1-2. The L-shaped base 1-2 is inversely connected above the horizontal base 1-1. A fixed seat 17 is connected below the horizontal base 1-1. A tool holder 2 is rotatably connected to the fixed seat 17. The tool holder 2 is of a plate structure and is vertically connected to the fixed seat 17. A longitudinal cutting tool 3 is connected to the tool holder 2. An active block 4 is provided on the horizontal base 1-1. The active block 4 is located at the bottom of the horizontal base 1-1. The active block 4 is slidably connected to the horizontal base 1-1 through a driving mechanism. The driving mechanism includes a rotating block 5, a transmission group and a driving member 6. In this embodiment, the rotating block 5 is of a cylindrical structure. The two axial ends thereof are rotatably connected to the horizontal base 1-1 through a pin shaft 5-2, so that the rotating block 5 can axially rotate relative to the horizontal base 1-1. The driving member 6 generally adopts a motor. The driving member 6 is fixed on the horizontal base 1-1. The transmission group is a gear group 8, which includes a first driving gear 8-1 and a first driven gear 8-2. The first driving gear 8-1 is connected to the output end of the driving member 6. The first driven gear 8-2 is connected to the pin shaft 5-2. The first driving gear 8-1 and the first driven gear 8-2 are meshed with each other. The driving member 6 drives the first driving gear 8-1 to rotate forward and backward. The first driving gear 8-1 drives the first driven gear 8-2 to rotate forward and backward. The first driven gear 8-2 is connected to the pin shaft 5-2. The rotating block 5 rotates forward and backward under the drive of the first driven gear 8-2. Of course, the transmission group can also be other transmission methods.

[0030] A slideway 5-1 is provided on the surface of the rotating block 5. The slideway 5-1 is opened on the surface of the cylinder and extends axially, forming a slideway 5-1 similar to a spiral path. The active block 4 is slidably fitted in the slideway 5-1. The active block 4 can slide along the path of the slideway 5-1. When the rotating block 5 rotates, the active block 4 forms an axial movement along the path of the slideway 5-1. The active block 4 and the tool holder 2 are connected through a connecting member, so as to realize that the active block 4 pulls the connecting member, and the connecting member pulls the tool holder 2, so that the tool holder 2 rotates along the fixed seat 17.

[0031] The connecting member can be a telescopic pull rod 7, that is, the pull rod 7 has a certain elastic buffer, so that the tool holder 2 has a certain elastic buffer when swinging.

[0032] It should be noted that the longitudinal cutting tool 3 can be a passive cutting tool or an active cutting tool. When the longitudinal cutting tool 3 rotates under the drive of a driving structure, it is an active cutting tool; when the longitudinal cutting tool 3 is rotatably connected to the tool holder 2 through a shaft body 15 and there is no additional driving structure to drive its rotation, it is a passive cutting tool; the longitudinal cutting tool 3 can be a cutter wheel, a stabbing tool, etc., and can be specifically selected and used according to actual production requirements.

[0033] An embodiment of the active longitudinal cutting tool is that a second driven wheel 12 and a second driving wheel 13 are provided on the tool rest 2. The second driven wheel 12 and the second driving wheel 13 are arranged front and back along the tool rest 2. The second driving wheel 13 is connected to the tool rest 2, and the longitudinal cutting tool 3 is connected to the second driven wheel 12. The second driving wheel 13 and the second driven wheel 12 are driven by a belt. A key shaft passes through the center of the second driving wheel 13, and a key hole is opened in the center of the key shaft. In this embodiment, the key hole is a hexagonal hole, and a connecting shaft 20 passes through the key hole. By driving the connecting shaft 20 to rotate, the key shaft is driven to rotate, the key shaft drives the second driving wheel 13 to rotate, thereby driving the second driven wheel 12 to rotate, and the second driven wheel 12 drives the longitudinal cutting tool 3 to rotate for longitudinal cutting.

[0034] When the number of longitudinal cutting assemblies is two or more, they are arranged side by side along the length direction of the cross beam 19. Each longitudinal cutting assembly is sequentially sleeved on the connecting shaft 20 through the second driving wheel 13, so that the connecting shaft 20 drives all the second driving wheels 13 to rotate at the same time. One end of the connecting shaft 20 is rotated by a driving device. In the attached drawing, the driving device is a combination of a gear structure 22 and a motor. Of course, other driving methods can also be used, which will not be listed one by one here.

[0035] Further, a coupling 9 is provided between the first driven wheel 8-2 and the rotating block 5 on the pin shaft 5-2, that is, the pin shaft 5-2 is designed in sections and connected by the coupling 9 to prevent the pin shaft 5-2 from bearing excessive torque loads and play an overload protection role.

[0036] Further, a slider 10 is provided on the movable block 4, and a guide rail 11 that is slidably matched with the slider 10 is provided on the base 1. Through the sliding cooperation of the slider 10 and the guide rail 11, it plays a guiding role in the sliding of the movable block 4 along the slideway 5-1, so that the movable block 4 can reciprocate more stably.

[0037] Further, a tensioning wheel 14 is provided between the second driving wheel 13 and the second driven wheel 12 on the tool rest 2 for tensioning the belt between the second driving wheel 13 and the second driven wheel 12. A shaft body 15 is provided on the tool rest 2, and the tensioning wheel 14 is sleeved on the shaft body 15. A kidney-shaped hole 16 is opened on the tool rest 2, and the shaft body 15 is movably connected in the kidney-shaped hole 16 and can adjust its position along the length direction of the kidney-shaped hole 16, so that the position of the tensioning wheel 14 can be adjusted.

[0038] Further, a horizontal pressing piece 18 is provided at the bottom of the tool rest 2 along the front-rear direction. The pressing piece 18 is fixed to the bottom of the tool rest 2 through fasteners. The pressing piece 18 is provided with an avoidance disconnection groove at the position of the longitudinal cutting tool 3 to avoid interfering with the rotation of the longitudinal cutting tool 3. The bottom of the tool rest 2 is provided with a kidney-shaped through hole, and the pressing piece 18 is fixed in the kidney-shaped through hole through fasteners, so as to realize the height adjustment of the pressing piece 18 relative to the tool rest 2. The pressing piece 18 is horizontally arranged and presses the cardboard simultaneously during longitudinal cutting. The front end of the pressing piece 18 is bent upward to guide the cardboard to feed paper.

[0039] Of course, the pressing piece 18 can also be fixed to the bottom of the fixed seat 17 and can be fixedly installed according to actual requirements.

[0040] The base 1 is slidably connected to the cross beam 19 through a transmission mechanism. The base 1 reciprocally slides along the length direction of the cross beam 19. The transmission mechanism includes a rack structure 21 fixed to the cross beam 19 and extending along the length direction of the cross beam 19. A gear structure 22 cooperating with the rack structure 21 is provided on the base 1. A first driving source 23 for driving the gear structure 22 to rotate is also provided on the base 1.

[0041] The transmission structure can also be a belt structure. The belt 26 in the belt structure is arranged along the length direction of the cross beam 19. A fixing block 27 that is transmitted along with the belt 26 is provided on the belt 26. A second driving source 28, such as a telescopic motor, is provided on the fixing block 27. The second driving source 28 has a telescopic end. A positioning block 29 is provided on the base 1. A positioning hole for inserting the telescopic end is provided on the positioning block 29. After the telescopic end of the second driving source 28 is inserted into the positioning hole, it forms a positioning with the positioning block 29, so that the positioning block 29 moves along with the transmission of the belt 26. The base 1 is connected to the fixing block 27, thereby realizing the belt 26 driving the base 1 to move. A position sensor 30 is also provided on the fixing block 27 for sensing the position of the positioning block, so that the telescopic end can accurately insert into the positioning hole.

[0042] The transmission mechanism can also be a lead screw pair structure. The lead screw pair structure includes a lead screw 31 fixed to the cross beam 19 and distributed along the length direction of the cross beam 19. A nut 32 is slidably fitted on the lead screw 31. The base 1 is connected to the nut 32. A third driving source 33 for driving the lead screw 31 to rotate is provided on the cross beam 19. The third driving source 33 is usually a motor to drive the lead screw 31 to rotate. The lead screw 31 drives the nut 32 to slide, and the nut 32 drives the base 1 to slide, finally realizing the longitudinal cutting assembly reciprocally sliding along the cross beam 19.

[0043] Of course, in addition to the above-mentioned gear-rack transmission structure and belt transmission structure, other transmission structures can also be adopted, which will not be listed one by one here.

[0044] Further, a guiding mechanism is also provided between the cross beam 19 and the base 1. The guiding mechanism includes a slide rail 24 fixed to the cross beam 19 and extending along the moving direction of the base 1. A sliding block 25 is provided on the base 1 and is in sliding cooperation with the slide rail 24. The guiding mechanism plays a stabilizing role in the sliding of the base 1.

[0045] Further, the base 1 includes a horizontal base 1-1 and an L-shaped base 1-2. The L-shaped base 1-2 is inversely connected above the horizontal base 1-1. A fixing seat 17 is connected below the horizontal base 1-1. The tool rest 2 is rotatably connected to the fixing seat 17. The gear structure 22 and the first driving source 23 are installed on the horizontal part of the L-shaped base 1-2. The sliding block 25 is installed on the vertical part of the L-shaped base 1-2. The purpose of such a design is to ensure the stability of the overall transmission of the base 1.

[0046] The present utility model is not limited to the above-mentioned optimal implementation manner. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as it has the same or similar technical solutions as the present application, it falls within the protection scope of the present utility model.

Claims

1. A longitudinal cutting device, characterized in that, Comprising a cross beam (19) and a longitudinal cutting assembly, The longitudinal cutting assembly includes a base (1), the base (1) is slidably connected to the cross beam (19) through a transmission mechanism, and the base (1) reciprocally slides along the length direction of the cross beam (19), A tool holder (2) is movably connected to the base (1), a longitudinal cutting tool (3) is connected to the tool holder (2), a movable block (4) is provided on the base (1), the movable block (4) is slidably connected to the base (1) through a driving mechanism, the driving mechanism includes a rotating block (5), a transmission group and a driving member (6), the rotating block (5) is rotationally connected to the base (1) through the transmission group, the rotating block (5) rotates under the drive of the driving member (6), a slideway (5-1) is provided on the surface of the rotating block (5), the movable block (4) is slidably fitted in the slideway (5-1), and the movable block (4) and the tool holder (2) are connected through a connecting member.

2. The longitudinal cutting device according to claim 1, characterized in that The transmission mechanism includes a rack structure (21) fixed to the cross beam (19) and extending along the length direction of the cross beam (19), a gear structure (22) cooperating with the rack structure (21) is provided on the base (1), and a first driving source (23) for driving the gear structure (22) to rotate is further provided on the base (1).

3. The longitudinal cutting device according to claim 2, characterized in that The base (1) includes a horizontal base (1-1) and an L-shaped base (1-2), the L-shaped base (1-2) is inversely connected above the horizontal base (1-1), a fixed seat (17) is connected below the horizontal base (1-1), the tool holder (2) is rotationally connected to the fixed seat (17), the gear structure (22) and the first driving source (23) are installed on the horizontal part of the L-shaped base (1-2), and a sliding block (25) is installed on the vertical part of the L-shaped base (1-2).

4. A longitudinal cutting device according to claim 1, wherein, The transmission mechanism includes a belt (26) fixed to the cross beam (19) and distributed along the length direction of the cross beam (19), a fixed block (27) driven by the belt (26) is provided on the belt (26), a second driving source (28) is provided on the fixed block (27), the second driving source (28) has a telescopic end, a positioning block (29) is provided on the base (1), and a positioning hole for inserting the telescopic end is provided on the positioning block (29), so that the fixed block (27) and the positioning block (29) are positioned, and the fixed block (27) drives the base (1) to move. A position sensor (30) for sensing the position of the positioning block (29) is further provided on the fixed block (27).

5. A longitudinal cutting device according to claim 1, wherein, The transmission mechanism is a lead screw pair structure, the lead screw pair structure includes a lead screw (31) fixed to the cross beam (19) and distributed along the length direction of the cross beam (19), a nut (32) is slidably fitted on the lead screw (31), the base (1) is connected to the nut (32), and a third driving source (33) for driving the lead screw (31) to rotate is provided on the cross beam (19).

6. A longitudinal cutting device according to claim 2, 4 or 5, characterized in that, A guiding mechanism is further provided between the cross beam (19) and the base (1). The guiding mechanism includes a sliding rail (24) fixed to the cross beam (19) and extending along the moving direction of the base (1), and a sliding block (25) slidably engaged with the sliding rail (24) is provided on the base (1).

7. A longitudinal cutting device according to claim 1, wherein, The longitudinal cutting knife (3) is an active longitudinal cutting knife (3), that is, the longitudinal cutting knife (3) is driven by a driving structure to rotate automatically.

8. A longitudinal cutting device according to claim 1, characterized in that, The longitudinal cutting knife (3) is a passive longitudinal cutting knife (3), that is, the longitudinal cutting knife (3) is movably connected to the tool holder (2). When the longitudinal cutting knife (3) presses down and contacts the cardboard, the longitudinal cutting knife (3) is driven to rotate by the movement of the cardboard; or the longitudinal cutting knife (3) is fixedly connected to the tool holder (2), the longitudinal cutting knife (3) is fixed relative to the tool holder (2), and the longitudinal cutting knife (3) presses down and inserts into the cardboard to form a longitudinal cut.

9. A longitudinal cutting device according to claim 7, wherein, A second driven wheel (12) and a second driving wheel (13) are provided on the tool holder (2). The second driven wheel (12) and the second driving wheel (13) are arranged front and back along the tool holder (2). The second driving wheel (13) is connected to the tool holder (2), the longitudinal cutting knife (3) is connected to the second driven wheel (12), and the second driving wheel (13) drives the second driven wheel (12) to rotate, so that the longitudinal cutting knife (3) cuts as an active longitudinal cutting knife (3).

10. A longitudinal cutting device according to claim 9, characterized in that, A tensioning wheel (14) is provided on the tool holder (2) between the second driving wheel (13) and the second driven wheel (12). A shaft body (15) is provided on the tool holder (2). The tensioning wheel (14) is sleeved on the shaft body (15). A kidney-shaped hole (16) is formed in the tool holder (2). The shaft body (15) is movably connected in the kidney-shaped hole (16) and can adjust its position along the length direction of the kidney-shaped hole (16).

11. A longitudinal cutting device according to claim 2, characterized in that, Both ends of the rotating block (5) are rotatably connected to the base (1) through a pin shaft (5-2). The transmission group includes a first driving wheel (8-1) and a first driven wheel (8-2). The first driving wheel (8-1) is connected to the output end of the driving member (6). The first driven wheel (8-2) is connected to the pin shaft (5-2). The first driving wheel (8-1) and the first driven wheel (8-2) are meshed with each other. A coupling (9) is provided on the pin shaft (5-2) between the first driven wheel (8-2) and the rotating block (5).

12. A longitudinal cutting device according to claim 11, wherein, A pressing piece (18) is provided at the bottom of the tool holder (2) along the front-back direction. The front end of the pressing piece (18) is bent upward. In the working state, the bottom surface of the pressing piece (18) moves with the tool holder (2) to press against the upper surface of the cardboard; or the pressing piece (18) is arranged on the fixed seat (17) and is located below the tool holder (2).

13. A longitudinal cutting device according to claim 9, characterized in that, The number of the longitudinal cutting assemblies is two or more, and they are arranged side by side along the length direction of the cross beam (19). A connecting shaft (20) is provided below the cross beam (19). The second driving wheels (13) of each longitudinal cutting assembly are sequentially arranged on the connecting shaft (20), so that the connecting shaft (20) drives all the second driving wheels (13) to rotate synchronously.

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