Start-stop control structure of can sealing machine

Abstract

The utility model discloses a start-stop control structure of a can sealing machine. The start-stop control structure comprises a machine body, a driving assembly, a can sealing assembly, a feeding assembly, a sensor and a can sealing gear, a top plate is arranged on the upper portion of the machine body, a bottom plate is arranged on the lower portion of the machine body, the driving assembly, the can sealing assembly, the sensor and the can sealing gear are arranged on the top plate, and the feeding assembly is connected with the driving assembly, coaxially arranged on the bottom plate below the can sealing assembly and used for containing a can body to be sealed. The can sealing gear is connected with the driving assembly, a marking block for the sensor to sense is arranged on the can sealing gear, the sensor is arranged at the position matched with the marking block, and the sensor is connected with the driving assembly and used for sensing the marking block to shut down the driving assembly in the can sealing process. The marking block on the can sealing gear is sensed through the sensor, then the driving assembly is shut down, the structure of the whole can sealing machine can be effectively simplified, the space utilization efficiency of the machine body of the can sealing machine is improved, the production and manufacturing cost is reduced, and later maintenance work is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing machine technical field, especially point to a kind of start-stop control structure of sealing machine. BACKGROUND

[0002] Sealing machine is used for sealing the mechanical equipment of various food, beverage and so on can body, ensure product quality and safety, and promote packaging quality, it is mainly divided into semi-automatic and full-automatic two types.Full-automatic sealing machine is commonly used transmission connecting rod 1', transmission gear 2' and the combination of travel switch 3' to control motor start-stop.Its mechanism is as follows: when sealing operation, transmission connecting rod 1' and transmission gear 2' are synchronous rotation with motor rotation.After sealing operation is completed, transmission gear 2' is full rotation, and transmission connecting rod 1' touches travel switch 3', and motor stops immediately.

[0003] As shown in Figure 1 Existing full-automatic sealing machine generally adopts the combination of transmission connecting rod 1', transmission gear 2' and travel switch 3' to control motor start-stop.Its mechanism is as follows: when sealing operation, transmission connecting rod 1' and transmission gear 2' are synchronous rotation with motor rotation.After sealing operation is completed, transmission gear 2' is full rotation, and transmission connecting rod 1' touches travel switch 3', and motor stops immediately.

[0004] However, this kind of control structure needs to set transmission connecting rod and transmission gear and multiple components, more complex in structure, reduce the space utilization efficiency of sealing machine body, and too complex structure also can improve production cost, easy to influence the maintenance work of later period. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of start-stop control structure of sealing machine, can simplify the structure of sealing machine, reduce production and maintenance cost.

[0006] To achieve the above-mentioned purpose, the solution of the utility model is as follows: a kind of start-stop control structure of sealing machine, including body and the drive assembly, sealing assembly, feeding assembly, sensor and sealing gear set on the body;

[0007] The upper part of the body is provided with a top plate, and the lower part of the body is provided with a bottom plate, the drive assembly, the sealing assembly, the sensor and the sealing gear are arranged on the top plate respectively, the feeding assembly is connected with the drive assembly and coaxially arranged on the bottom plate below the sealing assembly, for placing the can body to be sealed;

[0008] The sealing gear is connected with the drive assembly, and a mark block for the sensor to sense is arranged on the sealing gear, the sensor is arranged at a position matched with the mark block, the sensor is connected with the drive assembly, for sensing the mark block to shut down the drive assembly during sealing process.

[0009] Preferably, the number of sensors and the number of can sealing gears are both multiple, the multiple can sealing gears are coaxially stacked and rotationally arranged on the can sealing assembly, the multiple can sealing gears have a difference in the number of teeth, the driving assembly is connected with the multiple can sealing gears, and is used to drive each can sealing gear to independently rotate respectively, each can sealing gear is provided with a mark block for the sensor to sense, the multiple sensors are correspondingly arranged at positions matched with the mark blocks respectively, and the multiple sensors are connected with the driving assembly respectively, and are used to simultaneously sense the multiple mark blocks to stop the driving assembly during the can sealing process.

[0010] Preferably, the number of can sealing gears is two, 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 those of the lower can sealing gear, the upper can sealing gear and the lower can sealing gear are coaxially stacked and rotationally arranged on the can sealing assembly, and the upper can sealing gear and the lower can sealing gear are connected with the driving assembly.

[0011] Preferably, the upper transmission gear and the lower transmission gear are further included, the number of teeth of the upper transmission gear is equal to that of the upper can sealing gear, the number of teeth of the lower transmission gear is smaller than that of the upper transmission gear, the upper can sealing gear and the lower can sealing gear, the diameter of the upper transmission gear is greater than that of the lower transmission gear, the upper transmission gear and the lower transmission gear are coaxially stacked and connected with the driving assembly, the upper transmission gear is in meshing connection with the upper can sealing gear, and the lower transmission gear is in meshing connection with the lower can sealing gear.

[0012] Preferably, the number of mark blocks is two, including a first mark block and a second mark block, the number of sensors is two, including a first sensor and a second sensor, the first mark block is selectively arranged on the upper can sealing gear, the upper transmission gear or the lower transmission gear, the second mark block is arranged on the lower can sealing gear, and the first sensor and the second sensor are arranged at positions matched with the first mark block and the second mark block respectively.

[0013] Preferably, the driving assembly includes a motor, a belt, a transmission wheel and a transmission shaft, the output end of the motor is vertically upwardly arranged, the output end of the motor is connected with the transmission wheel through the belt, the transmission wheel is horizontally arranged, the transmission wheel is axially arranged with the transmission shaft, and the upper transmission gear and the lower transmission gear are sleeved on the transmission shaft.

[0014] Preferably, the fixed plate and the stand are further included, the fixed plate is arranged above the top plate through the stand, the upper can sealing gear, the lower can 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 stand and matched with the position of the first mark block, and the second sensor is arranged on the top plate and matched with the position of the second mark block.

[0015] Preferably, the can sealing assembly comprises a transmission unit connected with the upper can sealing gear and the lower can sealing gear, a roller connected with the transmission unit, and a pressing head arranged below the top plate and used for abutting against an inner edge of a can cover on a can body to be sealed.

[0016] Preferably, the marker block is a magnet, a light-reflecting sheet, a light-shielding sheet or a metal sheet, and the sensor is a Hall sensor, a photoelectric sensor or an inductive proximity sensor.

[0017] Preferably, the feeding assembly comprises a base coaxially arranged on a bottom plate below the can sealing assembly, an electric telescopic rod arranged on the base and connected with the driving assembly, and a feeding table arranged on the electric telescopic rod and used for placing the can body to be sealed.

[0018] With the above scheme, the can sealing machine has the advantages that the sensor is used to sense the marker block on the can sealing gear, the driving assembly is turned off, the structure of the can sealing machine is effectively simplified, the space utilization efficiency of the can sealing machine body is improved, the production manufacturing cost is reduced, and the maintenance work in the later period is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of a prior art full-automatic can sealing machine provided with a transmission connecting rod, a transmission gear and a travel switch to control the start and stop of a motor;

[0020] Figure 2 is a schematic view of the overall structure of the can sealing machine after the shell is removed in the embodiment of the utility model;

[0021] Figure 3 is a left view of the overall structure of the can sealing machine after the shell is removed in the embodiment of the utility model;

[0022] Figure 4 is a schematic view of the overall structure of the can sealing machine after the belt, the rotating wheel, the fixed plate and the stand are removed in the embodiment of the utility model;

[0023] Figure 5 is Figure 4 is an enlarged structure schematic view of position A in FIG. 5.

[0024] LABEL EXPLANATION:

[0025] 1, machine body; 11, top plate; 12, bottom plate;

[0026] 2, driving assembly; 21, motor; 22, belt; 23, transmission wheel;

[0027] 3, can sealing assembly; 31, transmission unit; 32, pressing head; 33, roller;

[0028] 4, the feeding assembly; 41, the base; 42, the electric telescopic rod; 43, the feeding table;

[0029] 5, the sensor; 51, the first sensor; 52, the second sensor;

[0030] 6, the marker block; 61, the first marker block; 62, the second marker block;

[0031] 7, the can sealing gear; 71, the upper can sealing gear; 72, the lower can sealing gear;

[0032] 81, the upper transmission gear; 82, the lower transmission gear;

[0033] 91, the fixed plate; 92, the stand. DETAILED DESCRIPTION

[0034] The utility model will be further described in connection with the drawings and specific embodiments.

[0035] The utility model provides a kind of start-stop control structure of can sealer, as shown in Figures 2 to 5 Fig. 1, including body 1 and the driving assembly 2, the can sealing assembly 3, the feeding assembly 4, the sensor 5 and the can sealing gear 7 being set on body 1;

[0036] The upper portion of body 1 is provided with top plate 11, and the lower portion of body 1 is provided with bottom plate 12, the driving assembly 2, the can sealing assembly 3, the sensor 5 and the can sealing gear 7 are respectively arranged on the top plate 11, the feeding assembly 4 is coaxially arranged on the bottom plate 12 below the can sealing assembly 3 and connected with the driving assembly 2, for placing the can body to be sealed;

[0037] The can sealing gear 7 is connected with the driving assembly 2, and the can sealing gear 7 is provided with the marker block 6 for the sensor 5 to sense, the sensor 5 is arranged at the position matched with the marker block 6, the sensor 5 is connected with the driving assembly 2, for sensing the marker block 6 and shutting down the driving assembly 2 during the sealing process.

[0038] In the embodiment, the marker block 6 is arranged on the can sealing gear 7, and the position of the marker block 6 is sensed by the sensor 5, so that the precise control of the sealing process can be realized. For example, when the sensor 5 senses the marker block 6, the driving assembly 2 is shut down in time or after a period of time, but it is not limited to this, the user can set according to actual demand, to ensure the smooth progress of the sealing process.

[0039] Specifically, the number of the sensor 5 and the number of the can sealing gears 7 are both multiple, the multiple can sealing gears 7 are coaxially stacked and rotationally arranged on the can sealing assembly 3, the multiple can sealing gears 7 have a difference in the number of teeth, the driving assembly 2 is connected with the multiple can sealing gears 7, and is used for driving each can sealing gear 7 to independently rotate respectively, each can sealing gear 7 is provided with a mark block 6 for the sensor 5 to sense, the multiple sensors 5 are respectively arranged at positions matched with the mark blocks 6, and the multiple sensors 5 are respectively connected with the driving assembly 2, and are used for simultaneously sensing the multiple mark blocks 6 to stop the driving assembly 2.

[0040] The multiple can sealing gears 7 are coaxially stacked and rotationally arranged on the can sealing assembly 3, the driving assembly 2 is connected with the multiple can sealing gears 7, each can sealing gear 7 is provided with a mark block 6 for the sensor 5 to detect, the multiple sensors 5 are respectively arranged at positions matched with the mark blocks 6, and the multiple sensors 5 are respectively connected with the driving assembly 2. Since the multiple can sealing gears 7 have a difference in the number of teeth, when the driving assembly 2 drives each can sealing gear 7 to independently rotate respectively, the multiple can sealing gears 7 have different rotating speeds, so that the multiple sensors 5 detect the multiple mark blocks 6 in sequence in the can sealing process. With the continuous rotation of the can sealing gears 7, the interval time of the multiple sensors 5 detecting the multiple mark blocks 6 in sequence is shortened. When the multiple sensors 5 simultaneously detect the multiple mark blocks 6, the driving assembly 2 stops working. Therefore, by arranging the sensors 5 to detect the mark blocks 6 on the multiple can sealing gears 7 with a difference in the number of teeth, the structure of the entire can sealing machine can be effectively simplified, the can sealing time can be controlled by adjusting the difference in the number of teeth, and the maintenance work is facilitated.

[0041] As shown in FIG. 1, Figures 2 to 5 The number of the can sealing gears 7 is two, including an upper can sealing gear 71 and a lower can sealing gear 72, the diameter and the number of teeth of the upper can sealing gear 71 are smaller than those of the lower can sealing gear 72, the upper can sealing gear 71 and the lower can sealing gear 72 are coaxially stacked and rotationally arranged on the can sealing assembly 3, and the upper can sealing gear 71 and the lower can sealing gear 72 are connected with the driving assembly 2.

[0042] In the embodiment, two can sealing gears 7 are adopted, the upper can sealing gear 71 has fewer teeth and a smaller diameter, and needs a shorter time to rotate one circle, while the lower can sealing gear 72 has more teeth and a larger diameter, and needs a longer time to rotate one circle. Therefore, the upper can sealing gear 71 and the lower can sealing gear 72 form a rotating speed difference due to the difference in the number of teeth and the size difference, the two can sealing gears 7 independently rotate respectively, and the two sensors 5 detect the two mark blocks 6 in sequence. With the continuous rotation, the interval time of the two sensors 5 detecting the two mark blocks 6 in sequence is shortened, when the two sensors 5 simultaneously detect the two mark blocks 6, the driving assembly 2 stops working, and the structure is simple and the design is ingenious.

[0043] Further, the upper transmission gear 81 and the lower transmission gear 82 are further included, the number of teeth of the upper transmission gear 81 is equal to the number of teeth of the upper can 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 can sealing gear 71 and the lower can 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 with the driving assembly 2, the upper transmission gear 81 is in meshing connection with the upper can sealing gear 71, and the lower transmission gear 82 is in meshing connection with the lower can sealing gear 72.

[0044] As a transmission assembly, the upper transmission gear 81 and the lower transmission gear 82 of the embodiment are coaxially stacked and connected with the driving assembly 2, as shown in Figure 3 and Figure 5 , which can better drive the upper can sealing gear 71 and the lower can sealing gear 72 to rotate independently. It should be noted that only the meshing connection relationship between the upper transmission gear 81 and the lower transmission gear 82 and the upper can sealing gear 71 and the lower can sealing gear 72 is shown in the figure, which is not as a limitation on the number of teeth and size of the upper transmission gear 81 and the lower transmission gear 82.

[0045] Since the diameter of the upper can sealing gear 71 is less than the diameter of the lower can sealing gear 72, the diameter of the upper transmission gear 81 of the embodiment is greater than the diameter of the lower transmission gear 82. In addition, the embodiment needs to satisfy that the number of teeth of the upper transmission gear 81 is equal to the number of teeth of the upper can 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 can 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 can sealing gear 72. In this way, the rotational speed difference between the upper can sealing gear 71 and the lower can sealing gear 72 can be ensured. For example, the number of teeth of the upper can sealing gear 71 is 58 teeth, the number of teeth of the lower can sealing gear 72 is 60 teeth, correspondingly, the number of teeth of the upper transmission gear 81 is 58 teeth, and the number of teeth of the lower transmission gear 82 is 56 teeth, but not limited thereto, the user can set the number of teeth and size according to the actual demand to adjust the can sealing time. Of course, in other embodiments, the positions and numbers of the upper transmission gear 81 and the lower transmission gear 82 can also be adjusted, such as horizontally staggered with other gears to drive the upper can sealing gear 71 and the lower can sealing gear 72.

[0046] As shown in Figure 3 and Figure 5As 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 is selectively arranged on the upper sealing gear 71, the upper transmission gear 81 or the lower transmission gear 82, the second marking block 62 is arranged on the lower sealing gear 72, and the first sensor 51 and the second sensor 52 are arranged at positions matched with the first marking block 61 and the second marking block 62, respectively.

[0047] In the embodiment, the upper transmission gear 81 and the lower transmission gear 82 are coaxially arranged and connected with 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, so that the rotating 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 arranged 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 arranged on the lower sealing gear 72, so as to ensure that the two sensors 5 can smoothly sense the marking blocks 6 on the two sealing gears 7.

[0048] In the embodiment, the helical gears are arranged for the upper sealing gear 71, the lower sealing gear 72, the upper transmission gear 81 and the lower transmission gear 82, and the teeth of the gears are inclined by 15 degrees, but the embodiment is not limited thereto. The helical gears can increase the contact area between the gears and improve the stability of rotation, thereby ensuring the sealing effect.

[0049] As shown in Figure 2 and Figure 3 , 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 upward, the output end of the motor 21 is connected with the transmission wheel 23 through the belt 22, the transmission wheel 23 is horizontally arranged, the transmission wheel 23 is axially arranged with the transmission shaft, and the upper transmission gear 81 and the lower transmission gear 82 are sleeved on the transmission shaft.

[0050] In the embodiment, the output end of the motor 21 is vertically upward, the transmission wheel 23 is horizontally arranged, and the transmission shaft is vertically downward and axially extended, so that the upper transmission gear 81 and the lower transmission gear 82 can be arranged along the same axis, thereby effectively improving the utilization efficiency of space and facilitating the later maintenance.

[0051] As shown in Figure 2 and Figure 3As shown, the fixed plate 91 is suspended above the top plate 11 by the column 92, the upper and lower can sealing gears 71 and 72, the upper and lower transmission gears 81 and 82 are arranged between the fixed plate 91 and the top plate 11, the first sensor 51 is arranged on the column 92 and matches the position of the first marker block 61, and the second sensor 52 is arranged on the top plate 11 and matches the position of the second marker block 62.

[0052] The fixed plate 91 of the present embodiment is suspended above the top plate 11 by the column 92, so that the upper and lower can sealing gears 71 and 72 and the upper and lower transmission gears 81 and 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, the first marker block 61 is arranged on the upper transmission gear 81, and the second marker block 62 is arranged on the lower can sealing gear 72, and correspondingly, the first sensor 51 is arranged on the fixed plate 91 matching the position of the first marker block 61, and the second sensor 52 is arranged on the top plate 11 matching the position of the second marker block 62, but not limited thereto, and the arrangement position can be adjusted in other embodiments.

[0053] As shown in Figure 3 and Figure 5 The can sealing assembly 3 includes a transmission unit 31, a pressure head 32 and a roller 33, the transmission unit 31 is connected with the upper and lower can sealing gears 71 and 72, the roller 33 is connected with the transmission unit 31, the pressure head 32 is arranged below the top plate 11 and used to abut against the inner edge of the can cover on the can body to be sealed, and 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.

[0054] The pressure head 32 of the present 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, and the pressure head 32 and the roller 33 cooperate with each other to perform the can sealing operation, which has good can sealing effect, does not need manual operation and improves the can sealing efficiency. The can sealing assembly 3 of the present embodiment can use the existing can sealing assembly 3, which will not be described in detail.

[0055] Furthermore, in this embodiment, the marking block 6 can be a magnet, a reflector, a light-shielding plate, or a metal sheet, and the sensor 5 can be a Hall sensor, a photoelectric sensor, or an inductive proximity sensor, but is not limited to these. The reflector and the light-shielding plate can both be used in conjunction with the photoelectric sensor. In this embodiment, the marking block 6 and the sensor 5 can be configured as a combination of a reflector and a photoelectric sensor, or a combination of a light-shielding plate and a photoelectric sensor. This design is simple, easy to set up, and has strong anti-interference capabilities, ensuring the stability of the can sealing operation. Specifically, when the inductive proximity sensor senses the metal sheet, it generates a pulse signal. When two inductive proximity sensors simultaneously sense the metal sheet, they send a signal to the drive assembly 2, thereby stopping the drive assembly 2 from operating. This is something that those skilled in the art can implement.

[0056] like Figures 2 to 4 As shown, the feeding assembly 4 includes a base 41, an electric telescopic rod 42, and a feeding platform 43. The base 41 is coaxially mounted on the base plate 12 below the sealing assembly 3. The electric telescopic rod 42 is mounted on the base 41 and connected to the drive assembly 2. The feeding platform 43 is mounted on the electric telescopic rod 42 and is used to place the can body to be sealed.

[0057] Once the sealing operation is complete, the drive assembly 2 stops operating, and the electric telescopic rod 42 simultaneously descends to its original position, thereby causing the sealed can body on the loading platform 43 to drop. The loading assembly 4 in this embodiment can be an existing loading assembly 4, which will not be discussed in detail here.

[0058] The directional terms used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0059] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A start / stop control structure for a can sealing machine, characterized in that: Includes the machine body and the drive components, sealing components, feeding components, sensors, and sealing gears installed on the machine body; The machine body has a top plate at the top and a bottom plate at the bottom. The drive assembly, sealing assembly, sensor and sealing gear are respectively set on the top plate. The feeding assembly is connected to the drive assembly and coaxially set on the bottom plate below the sealing assembly, and is used to place the cans to be sealed. The sealing gear is connected to the drive assembly. The sealing gear is equipped with a marker block for the sensor to sense. The sensor is set at a position that matches the marker block. The sensor is connected to the drive assembly and is used to sense the marker block during the sealing process to shut down the drive assembly.

2. The start / stop control structure for a can sealing machine as described in claim 1, characterized in that: The number of sensors and sealing gears is multiple. The multiple sealing gears are coaxially stacked and rotatably mounted on the sealing assembly. There is a difference in the number of teeth between the multiple sealing gears. The drive assembly is connected to the multiple sealing gears and is used to drive each sealing gear to rotate independently. Each sealing gear is provided with a marker block for the sensor to sense. The multiple sensors are respectively set at positions that match the marker blocks. The multiple sensors are respectively connected to the drive assembly and are used to simultaneously sense multiple marker blocks during the sealing process and shut down the drive assembly.

3. The start / stop control structure for a can sealing machine as described in claim 2, characterized in that: The sealing gear consists of two gears: an upper sealing gear and a lower sealing gear. The diameter and number of teeth of the upper sealing gear are smaller than those of the lower sealing gear. The upper and lower sealing gears are coaxially stacked and rotatably mounted on the sealing assembly. The upper and lower sealing gears are connected to the drive assembly.

4. The start / stop control structure for a can sealing machine as described in claim 3, 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 and lower transmission gears are coaxially stacked and connected to the drive assembly. The upper transmission gear meshes with the upper sealing gear, and the lower transmission gear meshes with the lower sealing gear.

5. The start / stop control structure for a can sealing machine as described in claim 4, 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 set on the upper sealing gear, the upper transmission gear, or the lower transmission gear. The second marking block is set on the lower sealing gear. The first sensor and the second sensor are respectively set at positions that match the first marking block and the second marking block.

6. The start / stop control structure for a can sealing machine as described in claim 5, characterized in that: The drive assembly includes a motor, a belt, a drive wheel, and a drive shaft. The output end of the motor is vertically upward and connected to the drive wheel via a belt. The drive wheel is horizontally positioned, and the drive shaft is axially positioned around the drive wheel. An upper drive gear and a lower drive gear are fitted onto the drive shaft.

7. The start / stop control structure for a can sealing machine as described in claim 6, characterized in that: It also includes a fixing plate and a column. The fixing plate is set above the top plate by the column. The upper sealing gear, the lower sealing gear, the upper transmission gear and the lower transmission gear are set between the fixing plate and the top plate. The first sensor is set on the column and matches the position of the first marker block. The second sensor is set on the top plate and matches the position of the second marker block.

8. The start / stop control structure for a can sealing machine as described in claim 4, characterized in that: The sealing assembly includes a transmission unit, a pressure head, and rollers. The transmission unit is connected to the upper sealing gear and the lower sealing gear. The rollers are connected to the transmission unit. The pressure head is located below the top plate and is used to abut against the inner edge of the lid on the can body to be sealed. The transmission unit drives the rollers to abut against the outer edge of the lid on the can body to cooperate with the pressure head to perform the sealing operation.

9. The start / stop control structure for a can sealing machine as described in claim 1, characterized in that: The marker block is a magnet, a reflector, a light-blocking sheet, or a metal sheet, and the sensor is a Hall sensor, a photoelectric sensor, or an inductive proximity sensor.

10. The start / stop control structure for a can sealing machine as described in claim 1, characterized in that: The feeding assembly includes a base, an electric telescopic rod, and a feeding platform. The base is coaxially mounted on the bottom plate below the sealing assembly. The electric telescopic rod is mounted on the base and connected to the drive assembly. The feeding platform is mounted on the electric telescopic rod and is used to place the cans to be sealed.

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