An opening and closing device for a damper

Abstract

This invention relates to an air damper opening and closing device, comprising an air damper cam, a cam driven bearing, a cam rocker arm, a rocker arm shaft, a rocker arm assembly, an air damper swing shaft, an exhaust pipe, and an intake pipe. The air damper cam is mounted on the main paper feeding drive shaft, and the cam driven bearing is mounted on the cam rocker arm, cooperating with the air damper cam. The rocker arm shaft is fixedly connected to the cam rocker arm. Two rocker arm assemblies are provided, each fixedly connected to one end of the rocker arm shaft, and the other end of the rocker arm assembly is fixedly connected to an air damper swing shaft. The two ends of the air damper swing shaft are respectively connected to a baffle plate inside the exhaust pipe and an exhaust plate on one side of the intake pipe. Compared with the prior art, this invention has the advantages of transmitting the movement of the main paper feeding drive shaft to the baffle plate inside the exhaust pipe and the exhaust plate on one side of the intake pipe through the air damper cam and rocker arm assembly, thus controlling the baffle plate and exhaust plate with high control efficiency; the opening and closing of the air damper and the movement of the main paper feeding drive shaft are synchronized in real time, ensuring strict coordination and synchronization of the paper feeding handover action.

Description

Technical Field

[0001] This invention relates to die-cutting machines, and more particularly to a damper opening and closing device. Background Technology

[0002] The damper switch of a die-cutting machine is mainly used in the paper feeding system to control the stability of paper delivery, ensuring that each sheet of paper arrives at the next work unit neatly and accurately. When the damper is closed, the paper feeding system generates suction and holds the paper or cardboard for transport. When the damper is open, the suction of the paper feeding system disappears. This stage is the handover stage between the paper feeding system and the die-cutting system. If the paper feeding system retains too much residual suction at this time, it will cause instability in the handover.

[0003] like Figure 1 As shown, in existing die-cutting machines, the damper opening and closing device is mainly controlled by cylinders. There is one damper on each side of the suction box, and two cylinders are used for control. The paper feeding process is completed by a mechanical cam. The cylinder control of the damper cannot guarantee real-time synchronization between the damper opening and closing and the mechanical cam movement at any speed, resulting in poor coordination with the overall machine operation and increasing the difficulty of paper feeding and debugging.

[0004] In summary, the technical problem that needs to be solved is how to design a damper switching device that can achieve high coordination between the paper feeding process and the damper opening and closing action. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, namely the poor coordination between the paper feeding process and the damper opening and closing action, and to provide a damper opening and closing device.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a damper switching device is provided, connected to a paper feeding main drive shaft. The switching device includes a damper cam, a cam driven bearing, a cam rocker arm, a rocker arm shaft, a rocker arm assembly, a damper swing shaft, an exhaust pipe, and an intake pipe. Two exhaust pipes are provided, located on opposite sides of the intake pipe. The damper cam is mounted on the paper feeding main drive shaft, and the cam driven bearing is mounted on the cam rocker arm and cooperates with the damper cam. The rocker arm shaft is fixedly connected to the cam rocker arm. Two rocker arm assemblies are provided, fixedly connected to both ends of the rocker arm shaft, with the other end of each assembly fixedly connected to a damper swing shaft. Both ends of the damper swing shaft are connected to a baffle plate inside an exhaust pipe and an exhaust plate on one side of the intake pipe, respectively.

[0008] As a preferred technical solution, the rocker arm assembly includes a rocker arm seat, an exhaust rocker arm, a damper pull rod, a short rocker arm, and a damper shaft seat; both ends of the rocker arm shaft are respectively installed in the rocker arm seats of two sets of rocker arm assemblies; one end of the exhaust rocker arm is fixedly connected to the rocker arm shaft, and the other end is rotatably connected to the damper pull rod; the other end of the damper pull rod is rotatably connected to the short rocker arm; the short rocker arm is fixedly connected to the damper swing shaft.

[0009] As a preferred technical solution, the two ends of the damper rod are connected to the exhaust swing rod and the short swing rod respectively through rod end joint bearings.

[0010] As a preferred technical solution, the exhaust pipe is cylindrical, and the shape of the baffle plate is the same as the cross-sectional shape of the exhaust pipe, rotating with the swing axis of the damper; when the baffle plate is in the first position, the baffle plate is perpendicular to the axis of the exhaust pipe, blocking the flow of gas in the exhaust pipe; when the baffle plate is in the second position, there is a gap between the baffle plate and the pipe wall of the exhaust pipe.

[0011] As a preferred technical solution, the side of the suction pipe is provided with a first ventilation hole evenly distributed around the circumference, and the exhaust plate is provided with a second ventilation hole evenly distributed around the circumference. The exhaust plate rotates with the swing shaft of the damper. When the exhaust plate is in the first position, the exhaust plate blocks the first ventilation hole. When the exhaust plate is in the second position, the first ventilation hole and the second ventilation hole are connected.

[0012] As a preferred technical solution, when the wind deflector is in the first position, the exhaust plate is also in the first position; when the wind deflector is in the second position, the exhaust plate is also in the second position.

[0013] As a preferred technical solution, the device further includes positioning sleeves, which are fitted and fixed on the damper swing shaft. There are two positioning sleeves, located on both sides of the exhaust pipe respectively.

[0014] As a preferred technical solution, the device further includes a clamping block, which is sleeved on the damper swing shaft and located on one side of the exhaust plate, and fixes the exhaust plate along the axis of the damper swing shaft.

[0015] As a preferred technical solution, the device also includes a pressure ring, and the exhaust plate and the suction pipe are connected by the pressure ring through screws.

[0016] As a preferred technical solution, the damper cam is sleeved on the paper feeding main drive shaft, and a tensioning sleeve is installed between the damper cam and the paper feeding main drive shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) This invention transmits the movement of the paper feeding main drive shaft to the baffle plate in the exhaust pipe and the exhaust plate on the side of the suction pipe through components such as the damper cam and the swing arm assembly. Two baffle plates and two exhaust plates can be controlled by one damper cam, which is highly efficient. The opening and closing of the damper and the movement of the paper feeding main drive shaft are synchronized in real time. Without the need to add complex program control, the strict coordination and synchronization of the paper feeding handover action can be guaranteed.

[0019] 2) The structural design of the baffle and exhaust plate of the present invention can ensure convenient switching of states when rotating with the swing shaft of the damper, and occupies little space; the second ventilation hole on the exhaust plate can not only cooperate with the first ventilation hole of the suction pipe to realize the opening and closing of the suction pipe, but also reduce the mass of the exhaust plate due to the opening of the second ventilation hole, and the moment of inertia of the exhaust plate is small when it rotates.

[0020] 3) This invention prevents the damper swing shaft from moving along the axis by using a positioning sleeve and prevents the exhaust plate from moving along the axis by using a clamping block, thus ensuring smooth switching operation. Attached Figure Description

[0021] Figure 1 A schematic diagram of an existing cylinder-controlled damper opening and closing device;

[0022] Figure 2 This is a schematic diagram of the overall structure of the opening and closing device of a damper according to the present invention;

[0023] Figure 3 This is a schematic diagram showing the external shape of the damper opening and closing device of the present invention mounted on a die-cutting machine;

[0024] Figure 4 This is a schematic diagram showing the connection between the damper cam and the main paper feeding drive shaft of the present invention;

[0025] Figure 5 This is a schematic diagram of the exhaust pipe and baffle structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the suction pipe and exhaust plate structure of the present invention;

[0027] The numbers in the diagram are as follows:

[0028] 1. Paper feeding main drive shaft; 2. Damper cam; 3. Tensioning sleeve; 4. Cam driven bearing; 5. Cam rocker arm; 6. Rocker arm seat; 7. Exhaust rocker arm; 8. Rocker arm shaft; 9. Rod end spherical bearing; 10. Damper pull rod; 11. Short rocker arm; 12. Damper shaft seat; 13. Damper swing shaft; 14. Positioning sleeve; 15. Exhaust pipe; 16. Baffle plate; 17. Clamping block; 18. Pressure ring; 19. Exhaust plate; 20. Suction pipe. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] Existing cylinder-controlled damper devices suffer from problems such as poor synchronization, high impact, excessive noise, and air leakage causing cylinder malfunction. Furthermore, they involve numerous control procedures and debugging steps. The neat and accurate feeding of paper is a crucial step in the die-cutting process; therefore, there is an urgent need for a damper switching device that is simple in structure, easy to assemble, has good synchronization, and stable control.

[0031] like Figure 2 and Figure 3 The present invention provides a damper opening and closing device, including a damper cam 2, a tensioning sleeve 3, a cam driven bearing 4, a cam rocker arm 5, a rocker arm shaft 8, a rocker arm assembly, a damper swing shaft 13, an exhaust pipe 15, an intake pipe 20, a positioning sleeve 14, a clamping block 17, and a pressure ring 18. The present invention is used in a die-cutting machine, which includes a paper feeding main drive shaft 1.

[0032] like Figure 4 As shown, the damper cam 2 is mounted on the paper feeding main drive shaft 1 and locked with a tensioning sleeve 3. The cam driven bearing 4 is mounted on the cam rocker arm 5 and locked with a nut. The damper cam 2 has a track inside, and the cam driven bearing 4 cooperates with the damper cam 2. When the damper cam 2 rotates, the cam driven bearing 4 moves along the track, driving the cam rocker arm 5 to move. The rocker arm shaft 8 is fixedly connected to the cam rocker arm 5, and the rocker arm shaft 8 rotates with the movement of the cam rocker arm 5. The cam driven bearing 4 can be a needle roller bearing.

[0033] The rocker arm assembly includes a rocker arm seat 6, an exhaust rocker arm 7, a damper pull rod 10, a short rocker arm 11, and a damper shaft seat 12. Two sets of rocker arm assemblies are installed at both ends of the rocker arm shaft 8. The two ends of the rocker arm shaft 8 are respectively installed in the rocker arm seats 6 of the two sets of rocker arm assemblies. One end of the exhaust rocker arm 7 is fixedly connected to the rocker arm shaft 8, and the other end is rotatably connected to the damper pull rod 10. The other end of the damper pull rod 10 is rotatably connected to the short rocker arm 11, which is fixedly connected to the damper swing shaft 13. The two ends of the damper pull rod 10 are connected to the exhaust rocker arm 7 and the short rocker arm 11 respectively via rod end joint bearings 9. Rotation of the rocker arm shaft 8 drives the exhaust rocker arm 7 to rotate, which in turn pulls the damper pull rod 10, which in turn pulls the short rocker arm 11, causing the damper swing shaft 13 to rotate.

[0034] like Figure 5As shown, the exhaust pipe 15 is cylindrical, and the baffle plate 16 is circular with the same dimensions as the cross-section of the exhaust pipe 15, rotating with the damper swing shaft 13. When the baffle plate 16 is in the first position, the baffle plate 16 is perpendicular to the axis of the exhaust pipe 15, and the gas flow in the exhaust pipe 15 is blocked by the baffle plate 16. When the baffle plate 16 is in the second position, there is a gap between the baffle plate 16 and the pipe wall of the exhaust pipe 15, and the gas flow in the exhaust pipe 15 is unobstructed.

[0035] like Figure 6 As shown, the suction pipe 20 has circumferentially distributed first ventilation holes on both sides, and the exhaust plate 19 has circumferentially distributed second ventilation holes. The first and second ventilation holes can be identical in shape, size, and spacing. The exhaust plate 19 rotates with the damper swing shaft 13. When the exhaust plate 19 is in the first position, the baffle between the second ventilation holes blocks the first ventilation holes, preventing gas flow. When the exhaust plate 19 is in the second position, the first and second ventilation holes are connected, allowing gas to flow through them. There are two exhaust plates 19, installed on both sides of the suction pipe 20 via pressure rings 18. The exhaust plates 19 and the suction pipe 20 are connected by screws via the pressure rings 18. The exhaust plate 19 shown in the figure is a grid type.

[0036] There are two exhaust pipes 15, located on both sides of the suction pipe 20. There are two damper swing shafts 13. The two ends of one damper swing shaft 13 are connected to the baffle plate 16 and the exhaust plate 19 located in the exhaust pipe 15 on one side. When the damper swing shaft 13 rotates, the baffle plate 16 and the exhaust plate 19 move synchronously. That is, when the exhaust pipe 15 is opened, the suction pipe 20 is opened at the same time, and when the exhaust pipe 15 is closed, the suction pipe 20 is closed at the same time.

[0037] Two positioning sleeves 14 are fitted onto the damper swing shaft 13 and secured to it by set screws. The two positioning sleeves 14 are located on both sides of the exhaust pipe 15. When the damper swing shaft 13 moves axially, the positioning sleeves 14 will lock onto the exhaust pipe 15 to prevent the damper swing shaft 13 from moving axially. A clamping block 17 is fitted onto the damper swing shaft 13 and located on one side of the exhaust plate 19. The exhaust plate 19 is clamped between the clamping block 17 and the side wall of the suction pipe 20, fixing the exhaust plate 19 along the axis of the swing shaft.

[0038] The working process of this invention is as follows:

[0039] When the die-cutting machine starts, the main drive shaft 1 drives the damper cam 2 to rotate. The cam rocker arm 5 swings back and forth along the cam curve trajectory. First, the motion is transmitted to the exhaust rocker arms 7 at both ends through the rocker arm shaft 8. Then, the two damper pull rods 10 pull the short rocker arm 11 to swing. Then, the damper swing shaft 13 starts to rotate, which realizes the opening and closing of the wind deflector 16 and the exhaust plate 19 at both ends. Since they are from the same power source, the actions of these four parts are consistent. When feeding paper, the wind deflector 16 and the exhaust pipe 15 are in the closed state, and the exhaust plate 19 and the suction pipe 20 are in the closed state. At this time, the damper is closed and a vacuum suction is formed in the suction box to ensure that each piece of cardboard is flat and stable against the lower suction bracket, and the paper is fed out smoothly and accurately. When the wind deflector 16 and the exhaust pipe 15 are in the open state, and the exhaust plate 19 and the suction pipe 20 are in the open state, the suction of the paper feeding system disappears, which is the paper feeding handover stage.

[0040] This invention employs a curve that perfectly matches the motion of the machine's mechanical cam, eliminating the need for complex program control and ensuring strict coordination and synchronization of paper feeding and handover actions. The motion curve is designed to avoid high rigidity and impact based on the required position. The cam follower bearing 4 uses a needle roller bearing to reduce impact load, resulting in noiseless operation and a long service life for the components. A grid-type planar rotating exhaust plate 19 is used, reducing its rotational inertia, lowering energy consumption, and saving space. One damper cam 2 controls four dampers, simplifying debugging, reducing manufacturing costs, increasing exhaust vents, and improving airflow switching efficiency.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A damper opening and closing device, connected to the paper feeding main drive shaft (1), characterized in that, The switching device includes a damper cam (2), a cam driven bearing (4), a cam rocker arm (5), a rocker arm shaft (8), a rocker arm assembly, a damper swing shaft (13), an exhaust pipe (15), and an intake pipe (20). There are two exhaust pipes (15), which are located on both sides of the intake pipe (20). The damper cam (2) is mounted on the paper feeding main drive shaft (1), and the cam driven bearing (4) is mounted on the cam rocker arm (5) and cooperates with the damper cam (2). The rocker arm shaft (8) is fixedly connected to the cam rocker arm (5). There are two sets of rocker arm assemblies, which are fixedly connected to both ends of the rocker arm shaft (8). The other end of the rocker arm assembly is fixedly connected to a damper swing shaft (13). The two ends of the damper swing shaft (13) are respectively connected to a baffle plate (16) inside an exhaust pipe (15) and an exhaust plate (19) on one side of the intake pipe (20).

2. The damper opening and closing device according to claim 1, characterized in that, The swing arm assembly includes a swing arm seat (6), an exhaust swing arm (7), a damper pull rod (10), a short swing arm (11), and a damper shaft seat (12); the two ends of the swing arm shaft (8) are respectively installed in the swing arm seats (6) of the two sets of swing arm assemblies; one end of the exhaust swing arm (7) is fixedly connected to the swing arm shaft (8), and the other end is rotatably connected to the damper pull rod (10); the other end of the damper pull rod (10) is rotatably connected to the short swing arm (11); the short swing arm (11) is fixedly connected to the damper swing shaft (13).

3. The damper opening and closing device according to claim 2, characterized in that, The two ends of the damper rod (10) are connected to the exhaust swing rod (7) and the short swing rod (11) respectively through the rod end joint bearing (9).

4. The damper opening and closing device according to claim 1, characterized in that, The exhaust pipe (15) is cylindrical, and the shape of the baffle plate (16) is the same as the cross-sectional shape of the exhaust pipe (15), and it rotates with the swing shaft (13) of the damper. When the baffle plate (16) is in the first position, the baffle plate (16) is perpendicular to the axis of the exhaust pipe (15) and blocks the flow of gas in the exhaust pipe (15). When the baffle plate (16) is in the second position, there is a gap between the baffle plate (16) and the pipe wall of the exhaust pipe (15).

5. The damper opening and closing device according to claim 4, characterized in that, The suction pipe (20) has a first ventilation hole evenly distributed around its circumference on its side, and the exhaust plate (19) has a second ventilation hole evenly distributed around its circumference. The exhaust plate (19) rotates with the damper swing shaft (13). When the exhaust plate (19) is in the first position, the exhaust plate (19) blocks the first ventilation hole. When the exhaust plate (19) is in the second position, the first ventilation hole and the second ventilation hole are connected.

6. The damper opening and closing device according to claim 5, characterized in that, When the wind deflector (16) is in the first position, the exhaust plate (19) is in the first position; when the wind deflector (16) is in the second position, the exhaust plate (19) is in the second position.

7. The damper opening and closing device according to claim 1, characterized in that, The device also includes a positioning sleeve (14), which is fitted and fixed on the damper swing shaft (13). There are two positioning sleeves (14), which are located on both sides of the exhaust pipe (15).

8. The damper opening and closing device according to claim 1, characterized in that, The device also includes a clamping block (17), which is sleeved on the damper swing shaft (13) and located on one side of the exhaust plate (19), and fixes the exhaust plate (19) along the axial direction of the damper swing shaft (13).

9. The damper opening and closing device according to claim 1, characterized in that, The device also includes a pressure ring (18), and the exhaust plate (19) and the suction pipe (20) are connected by screws to the pressure ring (18).

10. The damper opening and closing device according to claim 1, characterized in that, The damper cam (2) is sleeved on the paper feeding main drive shaft (1), and a tensioning sleeve (3) is installed between the damper cam (2) and the paper feeding main drive shaft (1).

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