Air tightness detection device for can

Abstract

A can airtightness detection device comprises a conveying belt, belt assemblies are arranged above the middle of the conveying belt in a front-back symmetry mode, transmission belts of the two belt assemblies are oppositely arranged, elastic pressing assemblies are arranged on the inner sides of the transmission belts, and the elastic pressing assemblies force the opposite sides of the two transmission belts to be close to each other; the belt assembly is installed on the lower portions of the positioning supports, photoelectric induction switches are arranged on the positioning supports and matched with the elastic pressing assemblies, the upper portions of the positioning supports are connected with the lifting supports through first lead screw sliding block mechanisms, and the distance between the positioning supports is adjustable. The lifting support is installed on one side of the fixed rack through a second lead screw sliding block mechanism and is adjustable in vertical position. According to the device, the displacement amount of the elastic pressing assembly is detected through the photoelectric sensing switch to judge whether the tank body is deformed or not, gas tightness detection of the tank body is achieved, the distance and the height of the two sets of belts can be adjusted, the detection effect is guaranteed, meanwhile, the tank bodies of different sizes can be detected conveniently, and universality is good.

Description

Technical Field

[0001] The utility model relates to an airtightness detection device for cans. Background Art

[0002] Cans are sealable containers made of sheet metal, glass, plastic, cardboard, or a combination of these materials. They contain commercially available food, which has been specifically treated to achieve commercial sterility and can be kept at room temperature for extended periods without spoiling. Soft cans (such as plastic and aluminum cans) are a common type of container. They can be used to package food, beverages, and medicines, and are widely used in the food packaging industry. During the actual production process, a certain amount of liquid nitrogen is added to the can. The vaporization of the liquid nitrogen displaces the air inside the can, extending the shelf life of the product. This also ensures a certain air pressure inside the can, ensuring a certain grip strength and preventing deformation during transportation. The success of canned food packaging depends on the effectiveness of its sealing performance. There are many ways to test the airtightness of soft cans. The most common method is to put the can directly into water and let it sink for airtightness testing. When there is a leak in the can, water will enter its interior, thereby generating bubbles, which can be used to determine whether the can's airtightness is qualified. This method also has defects. When the can is placed in, it will react with water to generate bubbles, but the process of water entering the can may also occur in this short period of time, which makes it impossible to observe the bubbles generated by the leakage. There are loopholes in the detection and leaking cans cannot be removed. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides an airtightness detection device for cans.

[0004] To achieve the above object, the utility model provides an airtightness detection device for cans, comprising a conveyor belt, the conveyor belt being arranged horizontally, and the can body being placed on the conveyor belt and conveyed from left to right;

[0005] Belt assemblies, the belt assemblies are symmetrically arranged above the middle of the conveyor belt, the transmission belts of the two groups of belt assemblies are arranged facing each other, and an elastic pressing assembly is provided on the inner side of the transmission belts, the elastic pressing assembly forces the two groups of transmission belts facing each other to approach each other, and the minimum distance between the transmission belts is less than the outer diameter of the tank body;

[0006] The belt assembly is installed at the lower part of the positioning bracket, the upper part of the positioning bracket forms a sliding fit with the lifting bracket through a first screw slider mechanism, the distance between the positioning brackets is adjustable, and the lifting bracket is installed on one side of the fixed frame through a second screw slider mechanism and the upper and lower positions are adjustable;

[0007] The elastic clamping assembly is installed at the bottom of the positioning bracket through a U-shaped bracket. The elastic clamping assembly includes a roller, which is rotatably installed in the middle of the positioning shaft. The upper and lower ends of the positioning shaft are square rod structures and pass through the waist-shaped groove on the positioning bracket and the waist-shaped groove I on the U-shaped bracket respectively. The waist-shaped groove and the waist-shaped groove I are both provided with compression springs that abut the end of the positioning shaft. A photoelectric sensor switch is provided on the positioning bracket along the length direction of the waist-shaped groove.

[0008] As a further improvement of the present invention, side limit plates are symmetrically provided on the front and rear sides of the conveyor belt, the distance between the side limit plates matches the outer diameter of the tank body, and the side limit plates are positioned away from the belt assembly.

[0009] As a further improvement of the present invention, the belt assembly includes a driving wheel and a driven wheel, the transmission belt is wound between the driving wheel and the driven wheel, the driving wheel is driven to rotate by a motor, and the moving direction and moving speed of the two sets of transmission belts facing each other are consistent with the conveyor belt.

[0010] As a further improvement of the present invention, the first screw slider mechanism includes a screw installed in the middle of the lifting bracket along the front-to-back direction, and a guide rod provided on both sides of the screw. The screw has a two-section thread structure and the thread rotation directions are opposite. Two guide sleeves are installed on the two sections of the thread of the screw and are respectively fixed to the two groups of positioning brackets. The two ends of the screw are rotatably connected to the lifting bracket through bearing seats. A first hand wheel is installed at one end of the screw, and the two ends of the guide rod are fixed to the lifting bracket. The sliding sleeve on the guide rod is provided with a guide block and is respectively fixed to the two groups of positioning brackets.

[0011] As a further improvement of the present invention, the second screw slider mechanism includes a guide sleeve I fixedly arranged on the upper part of the lifting bracket, the screw rod I is threadedly connected to the guide sleeve I, both ends of the screw rod I are rotatably connected to the fixed frame through the bearing seat I, and a guide rod I is also installed on the fixed frame. Guide blocks I are fixed on both sides of the lifting bracket to form a sliding fit with the guide rod I, and a limit bolt is installed on one of the guide blocks I. The lower end of the screw rod I is connected to the rotating shaft through a bevel gear structure, and the rotating shaft is horizontally installed at the lower part of the fixed frame. A second hand wheel is provided at one end of the rotating shaft.

[0012] As a further improvement of the present invention, a side push block is provided on the right side of the belt assembly and above the conveyor belt. The side push block is provided on one side, and the rear side of the side push block is connected to a side push cylinder.

[0013] The beneficial effects of the utility model are:

[0014] The device uses a photoelectric sensor switch to detect the radial displacement of the roller in the elastic pressing assembly to determine whether the tank body is deformed, thereby realizing online detection of the tank body's air tightness. The spacing and height of the two sets of belts can be adjusted to ensure the detection effect while facilitating the detection of tank bodies of different sizes. The device has a simple and compact structure and good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of an airtightness detection device for cans according to the utility model;

[0016] Figure 2 This is a side view of an airtightness detection device for cans according to the utility model;

[0017] Figure 3 It is a top view of the conveyor belt 1;

[0018] Figure 4 for Figure 1 A-direction view in;

[0019] Figure 5 for Figure 1 Middle BB section view.

[0020] Figure: 1. Conveyor belt; 2. Side limit plate; 3. Tank; 4. Belt assembly; 41. Transmission belt; 42. Driving pulley; 43. Motor; 44. Driven pulley; 5. Positioning bracket; 51. Waist groove; 6. Elastic pressing assembly; 61. Roller; 62. Positioning shaft; 63. U-shaped bracket; 631. Waist groove I; 64. Compression spring; 7. First screw slider mechanism; 71. Guide sleeve; 72. Screw; 73. Bearing Seat; 74. Guide block; 75. Guide rod; 76. First handwheel; 8. Lifting bracket; 9. Second screw slider mechanism; 91. Guide sleeve I; 92. Screw rod I; 93. Bearing seat I; 94. Guide block I; 95. Limit bolt; 96. Guide rod I; 10. Fixed frame; 11. Bevel gear structure; 12. Rotating shaft; 121. Second handwheel; 13. Side thrust block; 14. Side thrust cylinder; 15. Photoelectric sensor switch. DETAILED DESCRIPTION

[0021] like Figure 1-2 As shown, the utility model discloses an airtightness detection device for cans, comprising a conveyor belt 1, which is arranged horizontally. A can body 3 is placed on the conveyor belt 1 and conveyed from left to right. Side limit plates 2 are symmetrically provided on the front and rear sides of the conveyor belt 1. The distance between the side limit plates 2 matches the outer diameter of the can body 3, and the side limit plates 2 are positioned away from the belt assembly 4.

[0022] The belt assembly 4 is symmetrically arranged in the middle of the conveyor belt 1. The transmission belts 41 of the two belt assemblies 4 are arranged facing each other. The inner side of the transmission belt 41 is provided with an elastic pressing assembly 6. The elastic pressing assembly 6 forces the two sets of transmission belts 41 to move closer to each other. The minimum distance between the transmission belts 41 is less than the outer diameter of the tank 3 (see Figure 3 ), the belt assembly 4 includes a driving pulley 42 and a driven pulley 44, the transmission belt 41 is wound between the driving pulley 42 and the driven pulley 44, the driving pulley 42 is driven to rotate by the motor, and the moving direction and moving speed of the two sets of transmission belts 41 facing each other are consistent with the conveyor belt 1;

[0023] The belt assembly 4 is installed at the lower part of the positioning bracket 5. The upper part of the positioning bracket 5 forms a sliding fit with the lifting bracket 8 through the first screw slider mechanism 7. The distance between the positioning brackets 5 is adjustable. The lifting bracket 8 is installed on one side of the fixed frame 10 through the second screw slider mechanism 9 and the upper and lower positions are adjustable.

[0024] The elastic pressing assembly 6 is installed at the bottom of the positioning bracket 5 through the U-shaped bracket 63. The elastic pressing assembly 6 includes a roller 61, which is rotatably installed in the middle of the positioning shaft 62. The upper and lower ends of the positioning shaft 62 are square rod structures and pass through the waist groove 51 on the positioning bracket 5 and the waist groove I 631 on the U-shaped bracket 63 respectively. A compression spring 64 is provided in the waist groove 51 and the waist groove I 631 to abut the end of the positioning shaft 62. A photoelectric sensor switch 15 is provided on the positioning bracket 5 along the length direction of the waist groove 51 (see Figure 5 );

[0025] The first screw slider mechanism 7 includes a screw rod 72 installed in the middle of the lifting bracket 8 along the front-back direction, and a guide rod 75 provided on both sides of the screw rod 72. The screw rod 72 has a two-stage thread structure and the thread rotation direction is opposite. Two guide sleeves 71 are installed on the two sections of the thread of the screw rod 72 and are respectively fixed to the two groups of positioning brackets 5. The two ends of the screw rod 72 are rotatably connected to the lifting bracket 8 through the bearing seat 73. A first hand wheel 76 is installed at one end of the screw rod 72. The two ends of the guide rod 75 are fixed to the lifting bracket 8. The sliding sleeve on the guide rod 75 is provided with a guide block 74 which is respectively fixed to the two groups of positioning brackets 5 (see Figure 4 );

[0026] The second screw slider mechanism 9 includes a guide sleeve Ⅰ 91 fixedly provided on the upper part of the lifting bracket 8, a screw rod Ⅰ 92 being threadedly connected to the guide sleeve Ⅰ 91, and both ends of the screw rod Ⅰ 92 being rotatably connected to the fixed frame 10 through a bearing seat Ⅰ 93. A guide rod Ⅰ 96 is also installed on the fixed frame 10. Guide blocks Ⅰ 94 are fixedly provided on both sides of the lifting bracket 8 to form a sliding fit with the guide rod Ⅰ 96. A limit bolt 95 is installed on one of the guide blocks Ⅰ 94. The lower end of the screw rod Ⅰ 92 is connected to the rotating shaft 12 through a bevel gear structure 11. The rotating shaft 12 is horizontally installed at the lower part of the fixed frame 10, and a second hand wheel 121 is provided at one end of the rotating shaft 12.

[0027] A side push block 13 is provided on the right side of the belt assembly 4 and above the conveyor belt 1. The side push block 13 is provided on one side and the rear side of the side push block 13 is connected to a side push cylinder 14 (see FIG. Figure 3 ).

[0028] The device uses a photoelectric sensor switch to detect the radial displacement of the roller in the elastic pressing assembly to determine whether the tank body is deformed, thereby realizing online detection of the tank body's air tightness. The spacing and height of the two sets of belts can be adjusted to ensure the detection effect while facilitating the detection of tank bodies of different sizes. The device has a simple and compact structure and good versatility.

[0029] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings.

[0030] During operation, first adjust the spacing and height of the two belt assemblies according to the size of the tank body (outer diameter and height): when adjusting the spacing, turn the first hand wheel, the screw rotates with the first hand wheel, and the two guide sleeves on the screw drive the two sets of positioning brackets to move closer or farther away from each other. The spacing between the positioning brackets is determined according to the outer diameter of the tank, so that the distance between the two sets of conveyor belts on both sides matches the outer diameter of the tank; when adjusting the height, turn the second hand wheel, and the rotating shaft drives the screw rod I to rotate through the bevel gear structure. The rotational motion of the screw rod I is converted into the lifting motion of the guide sleeve I, and the guide sleeve drives the lifting bracket to move as a whole until the two sets of conveyor belts are in the middle position of the tank body. The cans are arranged on the conveyor belt and move. The two sets of conveyor belts are driven by motors and move at the same speed as the conveyor belts. The cans are guided between the conveyor belts by the side limit plates. When the cans move to the roller position, the cans with good air tightness basically do not deform. Since the minimum distance between the two rollers is less than the outer diameter of the can, the cans form a radial thrust on the rollers. After the rollers are subjected to force, the positioning shaft slides along the waist groove and waist groove I, the compression spring elastically contracts, and one end of the positioning shaft approaches the photoelectric sensor switch. The photoelectric sensor switch detects the radial displacement of the positioning shaft in real time. When the radial displacement reaches a predetermined value, it indicates that the can at this position meets the air tightness requirements; if the air tightness of the can is poor, the can will be squeezed and deformed by the two rollers, and the positioning shaft position will not shift. The radial displacement is less than the predetermined value, indicating that the can at this position needs to be rejected. After a certain time delay, the can moves to the side push block position, and the side push cylinder drives the side push block forward and pushes the unqualified can out of the conveyor belt, thus completing the air tightness test of a can.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A canned food airtightness detection device, characterized in that: include: A conveyor belt (1), wherein the conveyor belt (1) is arranged horizontally, and the tank body (3) is placed on the conveyor belt (1) and transported from left to right; A belt assembly (4), wherein the belt assembly (4) is symmetrically arranged above the middle of the conveyor belt (1) in front and back directions, and the transmission belts (41) of the two groups of the belt assembly (4) are arranged facing each other, and an elastic pressing assembly (6) is provided on the inner side of the transmission belt (41), and the elastic pressing assembly (6) forces the two groups of the transmission belts (41) facing each other to approach each other, and the minimum distance between the transmission belts (41) is less than the outer diameter of the tank body (3); The belt assembly (4) is mounted on the lower part of the positioning bracket (5); the upper part of the positioning bracket (5) forms a sliding fit with the lifting bracket (8) through a first screw slider mechanism (7); the distance between the positioning brackets (5) is adjustable; the lifting bracket (8) is mounted on one side of the fixed frame (10) through a second screw slider mechanism (9) and the upper and lower positions are adjustable; The elastic pressing assembly (6) is installed at the bottom of the positioning bracket (5) through a U-shaped bracket (63). The elastic pressing assembly (6) includes a roller (61). The roller (61) is rotatably installed in the middle of the positioning shaft (62). The upper and lower ends of the positioning shaft (62) are square rod structures and pass through the waist groove (51) on the positioning bracket (5) and the waist groove I (631) on the U-shaped bracket (63) respectively. The waist groove (51) and the waist groove I (631) are both provided with a compression spring (64) that abuts against the end of the positioning shaft (62). A photoelectric sensor switch (15) is provided on the positioning bracket (5) along the length direction of the waist groove (51).

2. The canned food airtightness detection device according to claim 1, characterized in that: Side limit plates (2) are symmetrically provided on the front and rear sides of the conveyor belt (1); the distance between the side limit plates (2) matches the outer diameter of the tank body (3); and the side limit plates (2) are positioned away from the belt assembly (4).

3. The canned food airtightness detection device according to claim 1, characterized in that: The belt assembly (4) comprises a driving wheel (42) and a driven wheel (44); the transmission belt (41) is wound between the driving wheel (42) and the driven wheel (44); the driving wheel (42) is driven to rotate by a motor; the moving direction and moving speed of the two sets of the transmission belts (41) facing each other are consistent with those of the conveyor belt (1).

4. The canned food airtightness detection device according to claim 1, characterized in that: The first screw slider mechanism (7) comprises a screw (72) installed in the middle of the lifting bracket (8) along the front-back direction, and a guide rod (75) provided on both sides of the screw (72). The screw (72) has a two-stage thread structure and the thread rotation directions are opposite. Two guide sleeves (71) are installed on the two sections of the thread of the screw (72) and are respectively fixed to the two groups of the positioning brackets (5). The two ends of the screw (72) are rotatably connected to the lifting bracket (8) through a bearing seat (73). A first hand wheel (76) is installed at one end of the screw (72). The two ends of the guide rod (75) are fixed to the lifting bracket (8). The sliding sleeve on the guide rod (75) is provided with a guide block (74) and is respectively fixed to the two groups of the positioning brackets (5).

5. The canned food airtightness detection device according to claim 1, characterized in that: The second screw slider mechanism (9) includes a guide sleeve I (91) fixed on the upper part of the lifting bracket (8), a screw rod I (92) and the guide sleeve I (91) are threadedly connected, and both ends of the screw rod I (92) are rotatably connected to the fixed frame (10) through a bearing seat I (93), and a guide rod I (96) is also installed on the fixed frame (10). Guide blocks I (94) are fixed on both sides of the lifting bracket (8) to form a sliding fit with the guide rod I (96), and a limiting bolt (95) is installed on one of the guide blocks I (94). The lower end of the screw rod I (92) is connected to the rotating shaft (12) through a bevel gear structure (11), and the rotating shaft (12) is horizontally installed at the lower part of the fixed frame (10). A second hand wheel (121) is provided at one end of the rotating shaft (12).

6. The canned food airtightness detection device according to claim 1, characterized in that: A side push block (13) is provided on the right side of the belt assembly (4) and above the conveyor belt (1). The side push block (13) is provided on one side, and the rear side of the side push block (13) is connected to a side push cylinder (14).

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