Start-stop control method of can sealing machine

Abstract

The invention discloses a start-stop control method of a can sealing machine, and relates to a can sealing machine which comprises a machine body, a driving assembly, a can sealing assembly, a feeding assembly, a plurality of sensors and a plurality of can sealing gears, and the driving assembly, the can sealing assembly, the feeding assembly, the sensors and the can sealing gears are arranged on the machine body. The start-stop control method comprises the following steps that S1, a to-be-sealed can body is placed on a feeding assembly, and an opening is covered with a can cover; s2, the driving assembly is started, the feeding assembly drives the to-be-sealed can body and the can cover to ascend to abut against the can sealing assembly, meanwhile, the driving assembly drives each can sealing gear to rotate independently, and the can sealing gears drive the can sealing assembly to conduct can sealing operation; and S3, when the multiple sensors sense the multiple marking blocks at the same time, the driving assembly stops running, the can sealing assembly stops can sealing operation, and the feeding assembly drives the sealed can body to descend. The sensor is arranged to sense the marking blocks on the multiple can sealing gears with the tooth number difference, so that can sealing operation is easier to control, the structure is simple, and production, manufacturing and maintenance are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of can sealing machines, and in particular to a start and stop control method of a can sealing machine. Background Art

[0002] Can sealing machines are mechanical equipment used to seal cans of various foods, beverages, etc. to ensure product quality and safety and improve packaging quality. They are mainly divided into semi-automatic and fully automatic types. Fully automatic can sealing machines often rely on motor drive, and after completing the operation, the motor must be precisely controlled to stop so that the operator can safely remove the can.

[0003] like Figure 1 As shown, the existing fully automatic can sealing machine generally uses a combination of a transmission connecting rod 1', a transmission gear 2' and a travel switch 3' to control the start and stop of the motor. Its mechanism is that during the can sealing operation, the transmission connecting rod 1' and the transmission gear 2' rotate synchronously with the rotation of the motor. After the can sealing operation is completed, the transmission gear 2' rotates a full circle, and the transmission connecting rod 1' triggers the travel switch 3', and the motor stops immediately.

[0004] However, this type of control structure requires the installation of multiple components such as transmission connecting rods and transmission gears. When the canning time changes, the transmission matching relationship between the transmission connecting rods and transmission gears needs to be accurately readjusted, which is difficult to operate and not conducive to subsequent maintenance. In addition, the existing control structure is relatively complex, which reduces the space utilization efficiency of the canning machine body, and the overly complex structure will also increase the production cost. Summary of the invention

[0005] The object of the present invention is to provide a start-stop control method for a can seaming machine, which makes the start-stop control of the can seaming machine simpler and more flexible in use through a simple structure.

[0006] To achieve the above-mentioned purpose, the solution of the present invention is: a start-stop control method of a can seaming machine, which relates to a can seaming machine, the can seaming machine comprising a machine body and a driving component, a can seaming component, a feeding component, a plurality of sensors and a plurality of can seaming gears arranged on the machine body;

[0007] A top plate is provided on the upper part of the machine body, a bottom plate is provided on the lower part of the machine body, a driving assembly, a can sealing assembly, a plurality of sensors and a plurality of can sealing gears are respectively arranged on the top plate, and a feeding assembly is connected with the driving assembly and coaxially arranged on the bottom plate below the can sealing assembly;

[0008] A plurality of sealing gears are coaxially stacked and rotatably arranged on the sealing assembly, a difference in the number of teeth is provided between the plurality of sealing gears, a driving assembly is connected to the plurality of sealing gears, each sealing gear is provided with a marking block for sensor sensing, a plurality of sensors are respectively arranged at positions matching the marking blocks, and the plurality of sensors are respectively connected to the driving assembly;

[0009] The start-stop control method comprises the following steps:

[0010] S1: placing the can body to be sealed on the loading assembly, and covering the opening of the can body to be sealed with a can cover;

[0011] S2: Start the driving assembly, the feeding assembly drives the can body and the can cover to be sealed to rise and rest against the can sealing assembly, and at the same time, the driving assembly drives each can sealing gear to rotate independently, and then the can sealing gear drives the can sealing assembly to perform the can sealing operation;

[0012] S3: During the independent rotation of the sealing gears, multiple sensors corresponding to the multiple sealing gears successively sense the marking blocks on the sealing gears. When multiple sensors sense multiple marking blocks at the same time, the driving component stops running, the sealing component stops the sealing operation, and the loading component drives the sealed can body to descend.

[0013] In a preferred embodiment, there are two seaming gears, including an upper seaming gear and a lower seaming gear, the diameter and the number of teeth of the upper seaming gear are smaller than the diameter and the number of teeth of the lower seaming gear, the upper seaming gear and the lower seaming gear are coaxially stacked and rotatably arranged on the seaming assembly, and the upper seaming gear and the lower seaming gear are connected to the driving assembly.

[0014] The preferred embodiment further comprises an upper transmission gear and a lower transmission gear, the number of teeth of the upper transmission gear is equal to the number of teeth of the upper sealing gear, the number of teeth of the lower transmission gear is less than the number of teeth of the upper transmission gear, the upper sealing gear and the lower sealing gear, the diameter of the upper transmission gear is greater than the diameter of the lower transmission gear, the upper transmission gear and the lower transmission gear are coaxially stacked and connected to the driving assembly, the upper transmission gear is meshed with the upper sealing gear, and the lower transmission gear is meshed with the lower sealing gear.

[0015] In a preferred embodiment, the number of the marking blocks is two, including a first marking block and a second marking block, the number of the sensors is two, including a first sensor and a second sensor, the first marking block can be selectively arranged on an upper sealing gear, an upper transmission gear or a lower transmission gear, the second marking block is arranged on a lower sealing gear, and the first sensor and the second sensor are respectively arranged at positions matching the first marking block and the second marking block.

[0016] In a preferred embodiment, the driving assembly includes a motor, a belt, a transmission wheel and a transmission shaft, the output end of the motor is arranged vertically upward, the output end of the motor is connected to the transmission wheel through a belt, the transmission wheel is arranged horizontally, the transmission shaft is axially arranged on the transmission wheel, and the upper transmission gear and the lower transmission gear are sleeved on the transmission shaft.

[0017] The preferred embodiment further comprises a fixed plate and a column, wherein the fixed plate is arranged above the top plate through the column, the upper sealing gear, the lower sealing gear, the upper transmission gear and the lower transmission gear are arranged between the fixed plate and the top plate, the first sensor is arranged on the fixed plate and matches the position of the first marking block, and the second sensor is arranged on the top plate and matches the position of the second marking block.

[0018] In a preferred embodiment, the can sealing assembly includes a transmission unit, a pressure head and a roller. The transmission unit is connected to the upper can sealing gear and the lower can sealing gear, and the roller is connected to the transmission unit. The pressure head is arranged below the top plate and is used to abut against the inner edge of the can cover on the can body to be sealed. The transmission unit drives the roller to abut against the outer edge of the can cover on the can body to be sealed to cooperate with the pressure head to perform the can sealing operation.

[0019] In a preferred embodiment, the marking block is a magnet, a reflective sheet, a light shielding sheet or a metal sheet, and the sensor is a Hall sensor, a photoelectric sensor or an inductive proximity sensor.

[0020] In a preferred embodiment, the loading assembly includes a base, an electric telescopic rod and a loading platform. The base is coaxially arranged on the bottom plate below the can sealing assembly, the electric telescopic rod is arranged on the base and connected to the drive assembly, and the loading platform is arranged on the electric telescopic rod for placing the can body to be sealed.

[0021] After adopting the above scheme, the beneficial effect of the present invention is that: the present invention coaxially stacks and rotatably arranges multiple sealing gears on the sealing assembly, the driving assembly is connected to the multiple sealing gears, each sealing gear is provided with a marking block for sensor sensing, multiple sensors are respectively arranged at positions matching the marking blocks, and multiple sensors are respectively connected to the driving assembly. Since there is a difference in the number of teeth between the multiple sealing gears, when the driving assembly drives each sealing gear to rotate independently, the multiple sealing gears have different rotation speeds, so that multiple sensors will successively sense multiple marking blocks during the sealing process. As the sealing gears continue to rotate, the interval time between the multiple sensors sensing the multiple marking blocks will be shortened. When multiple sensors sense multiple marking blocks at the same time, the driving assembly will stop working. Therefore, by setting sensors to sense the marking blocks on multiple sealing gears with a difference in the number of teeth, the control of the sealing operation is easier, and the sealing time can be controlled by adjusting the number of teeth of the sealing gears. It can also effectively simplify the structure of the sealing machine, improve the space utilization efficiency of the sealing machine body, reduce the production and manufacturing costs, and is also conducive to later maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of setting a transmission connecting rod, a transmission gear and a travel switch on an existing fully automatic can sealing machine to control the start and stop of the motor;

[0023] Figure 2 It is a schematic diagram of the overall structure of the can sealing machine after the outer shell is removed in the embodiment of the present invention;

[0024] Figure 3 It is a left side view of the overall structure of the can seamer after the outer shell is removed in the embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the overall structure of the can sealing machine in the embodiment of the present invention after the belt, rotating wheel, fixed plate and column are removed;

[0026] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 6 In the embodiment of the present invention, when the can sealing operation starts, an oscilloscope is used to display the pulse waveform images of two marking blocks sensed successively by two sensors;

[0028] Figure 7 In the embodiment of the present invention, when the can sealing operation is completed, an oscilloscope is used to display the pulse waveform image of two marking blocks sensed by two sensors at the same time.

[0029] Description of labels:

[0030] 1. Machine body; 11. Top plate; 12. Bottom plate;

[0031] 2. driving assembly; 21. motor; 22. belt; 23. transmission wheel;

[0032] 3. Sealing assembly; 31. Transmission unit; 32. Press head; 33. Roller;

[0033] 4. Loading assembly; 41. Base; 42. Electric telescopic rod; 43. Loading platform;

[0034] 5. sensor; 51. first sensor; 52. second sensor;

[0035] 6. Marking block; 61. First marking block; 62. Second marking block;

[0036] 7. Sealing gear; 71. Upper sealing gear; 72. Lower sealing gear;

[0037] 81, upper transmission gear; 82, lower transmission gear;

[0038] 91. Fixed plate; 92. Column. DETAILED DESCRIPTION

[0039] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0040] This embodiment provides a start and stop control method for a can seaming machine, which makes the start and stop control of the can seaming machine simpler and more flexible to use through a simple structure.

[0041] To achieve the above object, the solution of the present invention is: a start-stop control method of a can sealing machine, which relates to a can sealing machine, such as Figures 2 to 5 As shown, the can sealing machine comprises a machine body 1 and a driving assembly 2, a can sealing assembly 3, a feeding assembly 4, a plurality of sensors 5 and a plurality of can sealing gears 7 arranged on the machine body 1;

[0042] A top plate 11 is provided on the upper part of the machine body 1, and a bottom plate 12 is provided on the lower part of the machine body 1. The driving assembly 2, the canning assembly 3, a plurality of sensors 5 and a plurality of canning gears 7 are respectively arranged on the top plate 11. The feeding assembly 4 is connected to the driving assembly 2 and is coaxially arranged on the bottom plate 12 below the canning assembly 3.

[0043] A plurality of sealing gears 7 are coaxially stacked and rotatably arranged on the sealing assembly 3, and there is a difference in the number of teeth between the plurality of sealing gears 7. The driving assembly 2 is connected to the plurality of sealing gears 7, and each sealing gear 7 is provided with a marking block 6 for the sensor 5 to sense. The plurality of sensors 5 are respectively arranged at positions matching the marking blocks 6, and the plurality of sensors 5 are respectively connected to the driving assembly 2;

[0044] The start-stop control method comprises the following steps:

[0045] S1: placing the can body to be sealed on the loading assembly 4, and covering the opening of the can body to be sealed with a can cover;

[0046] S2: Start the driving assembly 2, the feeding assembly 4 drives the can body and the can cover to be sealed to rise and abut against the can sealing assembly 3, and at the same time, the driving assembly 2 drives each can sealing gear 7 to rotate independently, and then the can sealing gear 7 drives the can sealing assembly 3 to perform the can sealing operation;

[0047] S3: During the independent rotation of the sealing gear 7, the multiple sensors 5 corresponding to the multiple sealing gears 7 successively sense the marking blocks 6 on the sealing gear 7. When the multiple sensors 5 sense the multiple marking blocks 6 at the same time, the driving component 2 stops running, the sealing component 3 stops the sealing operation, and the loading component 4 drives the sealed can body to descend.

[0048] In this embodiment, by setting a marking block 6 on the canning gear 7 and using the sensor 5 to sense the position of the marking block 6, precise control of the canning process can be achieved. For example, when the sensor 5 senses the marking block 6, the drive component 2 is shut down in time or after a delay, but it is not limited to this. In this embodiment, when multiple sensors 5 sense multiple marking blocks 6 at the same time, the drive component 2 will stop running in time. Of course, the user can set it according to actual needs to ensure the smooth progress of the canning process.

[0049] like Figures 2 to 5 As shown, there are two sealing gears 7, including an upper sealing gear 71 and a lower sealing gear 72. The diameter and the number of teeth of the upper sealing gear 71 are smaller than the diameter and the number of teeth of the lower sealing gear 72. The upper sealing gear 71 and the lower sealing gear 72 are coaxially stacked and rotatably arranged on the sealing assembly 3. The upper sealing gear 71 and the lower sealing gear 72 are connected to the driving assembly 2.

[0050] In this embodiment, two sealing gears 7 are used. The upper sealing gear 71 has a small number of teeth and a small diameter, and the time required for one rotation is short, while the lower sealing gear 72 has a large number of teeth and a large diameter, and the time required for one rotation is long. Therefore, due to the difference in the number of teeth and the size difference between the upper sealing gear 71 and the lower sealing gear 72, a speed difference is formed. The two sealing gears 7 rotate independently, and the two sensors 5 will detect the two marking blocks 6 one after another. As the rotation continues, the interval between the two sensors 5 detecting the two marking blocks 6 one after another will be shortened. When the two sensors 5 detect the two marking blocks 6 at the same time, the driving component 2 will stop working. The structure is simple and the design is ingenious.

[0051] Further, it also includes an upper transmission gear 81 and a lower transmission gear 82, the number of teeth of the upper transmission gear 81 is equal to the number of teeth of the upper sealing gear 71, the number of teeth of the lower transmission gear 82 is less than the number of teeth of the upper transmission gear 81, the upper sealing gear 71 and the lower sealing gear 72, the diameter of the upper transmission gear 81 is greater than the diameter of the lower transmission gear 82, the upper transmission gear 81 and the lower transmission gear 82 are coaxially stacked and connected to the driving assembly 2, the upper transmission gear 81 is meshedly connected to the upper sealing gear 71, and the lower transmission gear 82 is meshedly connected to the lower sealing gear 72.

[0052] As a transmission assembly, the upper transmission gear 81 and the lower transmission gear 82 of this embodiment are coaxially stacked and connected to the drive assembly 2, such as Figure 3 and Figure 5 It should be noted that the figure only shows the meshing connection relationship between the upper transmission gear 81 and the lower transmission gear 82 and the upper sealing gear 71 and the lower sealing gear 72, and does not limit the number of teeth and size of the upper transmission gear 81 and the lower transmission gear 82.

[0053] Since the diameter of the upper sealing gear 71 is smaller than the diameter of the lower sealing gear 72, the diameter of the upper transmission gear 81 in this embodiment is larger than the diameter of the lower transmission gear 82. In addition, in this embodiment, the number of teeth of the upper transmission gear 81 is equal to the number of teeth of the upper sealing gear 71, and the sum of the number of teeth of the upper transmission gear 81 and the number of teeth of the upper sealing gear 71 is equal to the sum of the number of teeth of the lower transmission gear 82 and the number of teeth of the lower sealing gear 72. Only in this way can a speed difference be ensured between the upper sealing gear 71 and the lower sealing gear 72. For example, the number of teeth of the upper sealing gear 71 is 58, and the number of teeth of the lower sealing gear 72 is 60. Correspondingly, the number of teeth of the upper transmission gear 81 is 58, and the number of teeth of the lower transmission gear 82 is 56, but it is not limited thereto. The user can set the number of teeth and size according to actual needs to adjust the sealing time. Of course, in other embodiments, the position and number of the upper transmission gear 81 and the lower transmission gear 82 may also be adjusted, such as horizontally staggering the upper transmission gear 81 and the lower transmission gear 82 to cooperate with other gears to drive the upper sealing gear 71 and the lower sealing gear 72.

[0054] like Figure 3 and Figure 5 As shown, the number of the marking blocks 6 is two, including a first marking block 61 and a second marking block 62, the number of the sensors 5 is two, including a first sensor 51 and a second sensor 52, the first marking block 61 can be selectively arranged on the upper canning gear 71, the upper transmission gear 81 or the lower transmission gear 82, the second marking block 62 is arranged on the lower canning gear 72, and the first sensor 51 and the second sensor 52 are respectively arranged at positions matching the first marking block 61 and the second marking block 62.

[0055] In this embodiment, since the upper transmission gear 81 and the lower transmission gear 82 are coaxially stacked and connected to the driving assembly 2, and the number of teeth of the upper transmission gear 81 is equal to the number of teeth of the upper sealing gear 71, the rotation speeds of the upper sealing gear 71, the upper transmission gear 81 and the lower transmission gear 82 are the same during the sealing process. Therefore, the first marking block 61 can be selectively set on the upper sealing gear 71, the upper transmission gear 81 or the lower transmission gear 82, and the second marking block 62 should be set on the lower sealing gear 72, thereby ensuring that the two sensors 5 can smoothly sense the marking blocks 6 on the two sealing gears 7.

[0056] In this embodiment, the upper sealing gear 71, the lower sealing gear 72, the upper transmission gear 81 and the lower transmission gear 82 are all configured with helical gears. The gear teeth in this embodiment are inclined by 15 degrees, but are not limited thereto. This can increase the contact area between the gears, improve the stability of the rotation, and ensure the sealing effect.

[0057] like Figure 2 and Figure 3 As shown, the driving assembly 2 includes a motor 21, a belt 22, a transmission wheel 23 and a transmission shaft. The output end of the motor 21 is vertically arranged upward, and the output end of the motor 21 is connected to the transmission wheel 23 through the belt 22. The transmission wheel 23 is horizontally arranged, and the transmission shaft is axially arranged on the transmission wheel 23. The upper transmission gear 81 and the lower transmission gear 82 are sleeved on the transmission shaft.

[0058] In this embodiment, the output end of the motor 21 is vertically upward, the transmission wheel 23 is horizontally arranged, and the transmission shaft extends axially vertically downward, so that the upper transmission gear 81 and the lower transmission gear 82 can be arranged in a stacked manner along the same axis, effectively improving the utilization efficiency of space and making subsequent maintenance more convenient.

[0059] like Figure 2 and Figure 3 As shown, it also includes a fixing plate 91 and a column 92, the fixing plate 91 is arranged above the top plate 11 through the column 92, the upper sealing gear 71, the lower sealing gear 72, the upper transmission gear 81 and the lower transmission gear 82 are arranged between the fixing plate 91 and the top plate 11, the first sensor 51 is arranged on the fixing plate 91 and matches the position of the first marking block 61, and the second sensor 52 is arranged on the top plate 11 and matches the position of the second marking block 62.

[0060] The fixed plate 91 of this embodiment is suspended above the top plate 11 through the column 92, so that the upper sealing gear 71, the lower sealing gear 72, the upper transmission gear 81 and the lower transmission gear 82 can be arranged in the area between the fixed plate 91 and the top plate 11, making the loading and unloading process simpler and improving the utilization efficiency of space. Specifically, in this embodiment, the first marking block 61 is arranged on the upper transmission gear 81, and the second marking block 62 is arranged on the lower sealing gear 72. Correspondingly, the first sensor 51 is arranged on the fixed plate 91 matching the position of the first marking block 61, and the second sensor 52 is arranged on the top plate 11 matching the position of the second marking block 62, but it is not limited thereto. In other embodiments, the setting position can be adjusted.

[0061] like Figure 3 and Figure 5 As shown, the can sealing assembly 3 includes a transmission unit 31, a pressure head 32 and a roller 33. The transmission unit 31 is connected to the upper can sealing gear 71 and the lower can sealing gear 72. The roller 33 is connected to the transmission unit 31. The pressure head 32 is arranged below the top plate 11 and is used to abut against the inner edge of the can cover on the can body to be sealed. The transmission unit 31 drives the roller 33 to abut against the outer edge of the can cover on the can body to be sealed to cooperate with the pressure head 32 to perform the can sealing operation.

[0062] The pressure head 32 of this embodiment is used to fix the can body and abut against the inner edge of the top surface of the can cover, and the transmission unit 31 is connected with the two can sealing gears 7 and the two rollers 33. The two can sealing gears 7 drive the two rollers 33 to abut against the outer edge of the can cover through the transmission unit 31. The pressure head 32 and the rollers 33 cooperate inside and outside to perform the can sealing operation, and the can sealing effect is good, no manual operation is required, and the can sealing efficiency is improved. The can sealing assembly 3 of this embodiment can adopt the existing can sealing assembly 3, which will not be described in detail.

[0063] Further, the marking block 6 of the present embodiment is a magnet, a reflective sheet, a shading sheet or a metal sheet, and the sensor 5 is a Hall sensor, a photoelectric sensor or an inductive proximity sensor, but is not limited thereto, wherein the reflective sheet and the shading sheet can cooperate with the photoelectric sensor. The marking block 6 and the sensor 5 of the present embodiment can be set as a combination of a reflective sheet and a photoelectric sensor, or a combination of a shading sheet and a photoelectric sensor, which has a simple structure, is easy to set up, and has a strong anti-interference ability, and can ensure the stability of the canning operation.

[0064] Specifically, if Figure 6 and Figure 7 As shown, the yellow waveform (channel 2) is the pulse waveform of the first sensor 51 sensing the first marking block 61, and the blue waveform (channel 1) is the pulse waveform of the second sensor 52 sensing the second marking block 62. Figure 6 As shown, due to the high rotation speed of the upper sealing gear 71, a phase difference is generated, so that the first sensor 51 senses the first marking block 61 more times in the same cycle, that is, the number of pulse waveforms corresponding to the yellow waveform is greater. Figure 7 As shown, when the two sensors 5 sense the marking block 6 at the same time, the last two pulse signals displayed on the oscilloscope coincide with each other, thereby the driving component 2 stops working.

[0065] like Figures 2 to 4 As shown, the loading assembly 4 includes a base 41, an electric telescopic rod 42 and a loading platform 43. The base 41 is coaxially arranged on the bottom plate 12 below the can sealing assembly 3, the electric telescopic rod 42 is arranged on the base 41 and connected to the driving assembly 2, and the loading platform 43 is arranged on the electric telescopic rod 42 for placing the can body to be sealed.

[0066] When the canning operation is completed, the driving assembly 2 stops working, and the electric telescopic rod 42 will fall and reset at the same time, thereby driving the sealed can body of the loading platform 43 to fall. The loading assembly 4 of this embodiment can adopt the existing loading assembly 4, which will not be described in detail.

[0067] The directional terms mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0068] The above description is only a preferred embodiment of the present invention and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case shall fall within the protection scope of this case.

Claims

1. A start-stop control method for a can seamer, characterized in that: A can sealing machine is provided, which comprises a machine body and a driving assembly, a can sealing assembly, a feeding assembly, a plurality of sensors and a plurality of can sealing gears arranged on the machine body; A top plate is provided on the upper part of the machine body, a bottom plate is provided on the lower part of the machine body, a driving assembly, a can sealing assembly, a plurality of sensors and a plurality of can sealing gears are respectively arranged on the top plate, and a feeding assembly is connected with the driving assembly and coaxially arranged on the bottom plate below the can sealing assembly; A plurality of sealing gears are coaxially stacked and rotatably arranged on the sealing assembly, a difference in the number of teeth is provided between the plurality of sealing gears, a driving assembly is connected to the plurality of sealing gears, each sealing gear is provided with a marking block for sensor sensing, a plurality of sensors are respectively arranged at positions matching the marking blocks, and the plurality of sensors are respectively connected to the driving assembly; The start-stop control method comprises the following steps: S1: placing the can body to be sealed on the loading assembly, and covering the opening of the can body to be sealed with a can cover; S2: Start the driving assembly, the feeding assembly drives the can body and the can cover to be sealed to rise and rest against the can sealing assembly, and at the same time, the driving assembly drives each can sealing gear to rotate independently, and then the can sealing gear drives the can sealing assembly to perform the can sealing operation; S3: During the independent rotation of the sealing gears, multiple sensors corresponding to the multiple sealing gears successively sense the marking blocks on the sealing gears. When multiple sensors sense multiple marking blocks at the same time, the driving component stops running, the sealing component stops the sealing operation, and the loading component drives the sealed can body to descend.

2. A method for starting and stopping a can seamer according to claim 1, characterized in that: There are two can sealing gears, including an upper can sealing gear and a lower can sealing gear. The diameter and the number of teeth of the upper can sealing gear are smaller than the diameter and the number of teeth of the lower can sealing gear. The upper can sealing gear and the lower can sealing gear are coaxially stacked and rotatably arranged on the can sealing assembly. The upper can sealing gear and the lower can sealing gear are connected to the driving assembly.

3. A method for starting and stopping a can seamer as claimed in claim 2, characterized in that: It also includes an upper transmission gear and a lower transmission gear, the number of teeth of the upper transmission gear is equal to the number of teeth of the upper sealing gear, the number of teeth of the lower transmission gear is less than the number of teeth of the upper transmission gear, the upper sealing gear and the lower sealing gear, the diameter of the upper transmission gear is greater than the diameter of the lower transmission gear, the upper transmission gear and the lower transmission gear are coaxially stacked and connected to the driving component, the upper transmission gear is meshed with the upper sealing gear, and the lower transmission gear is meshed with the lower sealing gear.

4. A method for starting and stopping a can seamer as claimed in claim 3, characterized in that: The number of the marking blocks is two, including a first marking block and a second marking block. The number of the sensors is two, including a first sensor and a second sensor. The first marking block can be selectively arranged on an upper can sealing gear, an upper transmission gear or a lower transmission gear, and the second marking block is arranged on a lower can sealing gear. The first sensor and the second sensor are respectively arranged at positions matching the first marking block and the second marking block.

5. A method for starting and stopping a can seamer as claimed in claim 4, characterized in that: The driving assembly includes a motor, a belt, a transmission wheel and a transmission shaft. The output end of the motor is vertically arranged upward, and the output end of the motor is connected to the transmission wheel through a belt. The transmission wheel is horizontally arranged, and the transmission shaft is axially arranged on the transmission wheel. The upper transmission gear and the lower transmission gear are sleeved on the transmission shaft.

6. A method for starting and stopping a can seamer as claimed in claim 5, characterized in that: It also includes a fixed plate and a column, wherein the fixed plate is arranged above the top plate through the column, the upper sealing gear, the lower sealing gear, the upper transmission gear and the lower transmission gear are arranged between the fixed plate and the top plate, the first sensor is arranged on the fixed plate and matches the position of the first marking block, and the second sensor is arranged on the top plate and matches the position of the second marking block.

7. A method for starting and stopping a can seamer as claimed in claim 3, characterized in that: The can sealing assembly includes a transmission unit, a pressure head and a roller. The transmission unit is connected to the upper can sealing gear and the lower can sealing gear. The roller is connected to the transmission unit. The pressure head is arranged below the top plate and is used to abut against the inner edge of the can cover on the can body to be sealed. The transmission unit drives the roller to abut against the outer edge of the can cover on the can body to be sealed to cooperate with the pressure head to perform the can sealing operation.

8. A method for starting and stopping a can seamer as claimed in claim 1, characterized in that: The marking block is a magnet, a reflective sheet, a light shielding sheet or a metal sheet, and the sensor is a Hall sensor, a photoelectric sensor or an inductive proximity sensor.

9. A method for starting and stopping a can seamer as claimed in claim 1, characterized in that: The loading assembly includes a base, an electric telescopic rod and a loading platform. The base is coaxially arranged on the bottom plate below the can sealing assembly. The electric telescopic rod is arranged on the base and connected to the driving assembly. The loading platform is arranged on the electric telescopic rod for placing the can body to be sealed.

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