Air leakage detection equipment for pre-packaged food packaging bag

Abstract

The invention relates to the technical field of food packaging, in particular to pre-packaged food packaging bag air leakage detection equipment which comprises a base, a vacuum bin, a feeding part and a discharging part, the interior of the vacuum bin is divided into a first vacuum cavity and a second vacuum cavity, and the first vacuum cavity is correspondingly provided with a pair of first blocking doors capable of vertically sliding; the second vacuum cavity is correspondingly provided with a pair of second blocking doors capable of vertically sliding. Pressure sensors are arranged in the first vacuum cavity and the second vacuum cavity. A driving assembly is further arranged and used for driving the first blocking door and the second blocking door to vertically move. A vacuum assembly is further arranged and used for extracting air in the first vacuum cavity and the second vacuum cavity. Through cooperative arrangement of the first vacuum cavity, the second vacuum cavity and the like, alternate switching of opening and closing states of the cavities is achieved under the condition that the servo motor drives the lifting lead screw to rotate, the continuity of detection operation is improved, and therefore the detection time consumption of a single batch of packaging bags is further shortened.

Description

Technical Field

[0001] This invention relates to the field of food packaging technology, and in particular to a device for detecting air leakage in pre-packaged food bags. Background Technology

[0002] Prepackaged food bags are sealed packaging products used to hold a fixed amount of prepackaged food. They are used to protect food quality and extend shelf life. They are also called food sealing bags. Relying solely on manual visual inspection of the sealing condition does not meet the actual application needs. In order to accurately identify sealing defects in packaging bags, leakage detection methods are required to ensure the safety and quality of food during consumption.

[0003] Existing technology, such as the food safety packaging leakage detection device disclosed in announcement number CN219675371U, includes a bracket, a lifting rod, a testing component, a controller, and a motor. The bracket includes a connecting column, a top platform, a base, a compression platform, and a guardrail. The connecting column is disposed on the upper surface of the base, the compression platform is fixedly installed on the upper surface of the base, and the guardrail is disposed on the upper surface of the compression platform. The lifting rod is provided with a threaded rod, which is rotatably connected to the base and the bracket.

[0004] However, this technical solution has the following problems in practical use: The outer diameter of the telescopic rod matches the inner diameter of the spring. After the sponge contacts the packaging bag to be tested, the spring compresses, and the mounting plate presses upward against the force sensor. After reaching the set height, the motor stops, and the display screen is observed to check the data. However, because the movement distance of the mounting plate is controlled by the preset height, the squeezing force cannot be flexibly adjusted according to the actual thickness of the packaging bag. This makes it difficult to ensure the stability of the testing process, which in turn increases the time required for a single test and ultimately restricts the improvement of efficiency for large-scale batch testing. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that in the prior art, the moving distance of the mounting plate is controlled by a preset height, which cannot flexibly adjust the squeezing force according to the actual thickness of the packaging bag, making it difficult to ensure the stability of the detection process, thus increasing the time consumed for a single detection and ultimately restricting the improvement of the efficiency of large-scale batch detection. Therefore, this invention proposes a leak detection device for pre-packaged food packaging bags.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A leak detection device for pre-packaged food bags includes a base, a vacuum chamber fixed to the top of the base, and a feeding section and a discharging section configured in conjunction with the vacuum chamber. The vacuum chamber is internally divided into a vacuum chamber one and a vacuum chamber two. The vacuum chamber one is equipped with a pair of vertically sliding first doors, and the vacuum chamber two is equipped with a pair of vertically sliding second doors. Several pressure sensors for detecting pressure are installed in both the vacuum chamber one and the vacuum chamber two. It is also equipped with a drive component, which is used to drive the first stop door and the second stop door to move vertically, so as to realize the alternating switching of the opening and closing states of the first vacuum chamber and the second vacuum chamber; It is also equipped with a vacuum assembly, which is used to extract air from the first and second vacuum chambers to create a stable vacuum environment inside the two chambers.

[0007] Preferably, the driving component includes: The first transmission rod is fixedly installed on the top of the two first stop gates; The first concave seat is fixedly mounted on the vertical side wall of the first transmission rod; The first traction rod is rotatably mounted on the first concave seat via a pin. The second transmission rod is fixedly installed on the top of the two second stop gates; The second concave seat is fixedly mounted on the vertical side wall of the second transmission rod; The second traction rod is rotatably mounted on the second concave seat via a pin.

[0008] Preferably, the driving component further includes: Mounting plates, in pairs, are fixedly installed on the top of the vacuum chamber; The connecting plate is rotatably mounted on the mounting plate via pins, and both ends of the connecting plate are rotatably connected to the first traction rod and the second traction rod respectively via pins.

[0009] Preferably, the driving component further includes: The lifting rod is fixedly connected to the first transmission rod; A horizontal plate is fixedly installed on the vertical outer wall of the vacuum chamber. A lifting screw is rotatably mounted at the bottom of the horizontal plate, and the lifting rod and the lifting screw are threadedly connected. A servo motor is fixedly mounted on the top of the horizontal plate and is used to drive the lifting screw to rotate. The material transfer fixture is used to move the packaging bag to be inspected, and cooperates with the opening and closing actions of the first gate and the second gate to complete the feeding and discharging operations.

[0010] Preferably, the material transfer fixture includes: Settling tanks are respectively formed inside the first vacuum chamber and the second vacuum chamber; Conveyor rollers, a pair of conveyor rollers are rotatably disposed in the settling tank, and one of the drive rollers in one pair extends to the outside of the vacuum chamber; A conveyor belt is provided in conjunction with the drive roller.

[0011] Preferably, the transfer fixture further includes: The ratchet is coaxially fixed at the bottom end of the lifting screw; The first rotating rod is rotatably mounted on the top of the base; The first spur gear is fixedly sleeved on the top of the first rotating rod; A connecting shaft, with several connecting shafts arranged in a circular array on top of the first spur gear; A pawl is rotatably mounted on the connecting shaft, and the pawl and the ratchet are correspondingly arranged; A torsion spring is fixedly sleeved on the connecting shaft, and both ends of the torsion spring are fixedly connected to the first spur gear and the ratchet, respectively.

[0012] Preferably, the transfer fixture further includes: The first bevel gear is coaxially fixed at the extension end of the conveyor roller; The second rotating rod is rotatably mounted on the top of the base; The second spur gear is fixedly mounted on the top of the second rotating rod, and the second spur gear meshes with the first spur gear; The second bevel gear is coaxially fixed to the top of the second spur gear, and the second bevel gear meshes with the first bevel gear.

[0013] Preferably, the vacuum assembly includes: A vacuum pump is fixedly installed on the top of the vacuum chamber; A vent pipe is adapted to and connected to the vacuum pump, and the vent pipe is simultaneously connected to both vacuum chamber one and vacuum chamber two.

[0014] Preferably, the vacuum assembly further includes: The first air extraction valve is connected in parallel to a branch pipe of the ventilation pipe, and the first air extraction valve is set corresponding to the air inlet end of the vacuum chamber. The second air extraction valve is connected in parallel to a branch pipe of the vent pipe, and the second air extraction valve is configured to correspond to the air inlet end of the second vacuum chamber.

[0015] Preferably, the vacuum chamber is provided with several guide slopes, and the guide slopes are correspondingly arranged with the first vacuum chamber, the second vacuum chamber, the feeding part and the discharging part. The vacuum chamber is fixedly provided with a glass window for easy observation.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: 1. This invention, through the coordinated arrangement of components such as the drive assembly, has the first and second traction rods respectively mounted on corresponding concave seats via pins, and the connecting plate mounted on the mounting plate via pins. Under the rotation of the lifting screw driven by the servo motor, the alternating switching of the chamber opening and closing states is realized, which improves the continuity of the inspection operation and further shortens the inspection time of a single batch of packaging bags.

[0017] 2. This invention, through the coordinated arrangement of components such as material transfer fixtures, with the pawl rotatably mounted on the connecting shaft and the first bevel gear coaxially fixedly mounted on the extension end of the conveyor roller, achieves synchronous feeding and discharging with the opening and closing of the chamber under the rotation of the ratchet driven by the lifting screw, thereby improving the automation level of the equipment and further reducing the impact of errors caused by manual operation.

[0018] 3. Through the coordinated arrangement of components such as vacuum components, the first and second suction valves are installed in parallel on the branch pipe of the ventilation pipe, and the pressure sensor is installed on the inner wall of the vacuum chamber. With the alternating opening and closing of the valves and the operation of the vacuum pump, the dual-chamber alternating vacuum detection is realized, which improves the stability of the detection results and thus further adapts to the actual needs of large-scale batch detection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a pre-packaged food packaging bag leakage detection device proposed in this invention; Figure 2 This is a schematic diagram of vacuum chamber one and vacuum chamber two in a pre-packaged food bag leakage detection device proposed in this invention; Figure 3 This is a schematic diagram of the mounting plate in a pre-packaged food bag leakage detection device proposed in this invention; Figure 4 This is a schematic diagram of a pressure sensor in a pre-packaged food bag leakage detection device proposed in this invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the ratchet in a pre-packaged food bag leakage detection device proposed in this invention; Figure 7 This is a schematic diagram of the vent pipe in a pre-packaged food bag leakage detection device proposed in this invention.

[0020] In the picture: 1. Base; 2. Vacuum chamber; 21. Guide slope; 3. Feeding section; 4. Discharge section; 5. Vacuum Chamber 1; 51. First Stop Gate; 52. First Transmission Rod; 521. Lifting Rod; 522. Horizontal Plate; 523. Servo Motor; 524. Lifting Screw; 5241. Ratchet; 5242. First Rotating Rod; 5243. First Spur Gear; 5244. Connecting Shaft; 5245. Pawl; 5246. Torsion Spring; 53. First Concave Seat; 54. First Traction Rod; 6. Vacuum chamber two; 61. Second stop gate; 62. Second transmission rod; 63. Second concave seat; 64. Second traction rod; 7. Mounting plate; 71. Connecting plate; 8. Vacuum pump; 81. Vent pipe; 811. First evacuation valve; 812. Second evacuation valve; 9. Settling trough; 91. Conveyor belt; 92. Conveyor roller; 921. First bevel gear; 922. Second rotating rod; 923. Second spur gear; 924. Second bevel gear; 10. Pressure sensor; 11. Glass window. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figures 1-7 A pre-packaged food packaging bag leakage detection device includes a base 1, a vacuum chamber 2 fixed on the top of the base 1, and a feeding part 3 and a discharging part 4 provided in conjunction with the vacuum chamber 2. The vacuum chamber 2 is divided into a first vacuum chamber 5 and a second vacuum chamber 6. The first vacuum chamber 5 is equipped with a pair of vertically sliding first baffles 51, and the second vacuum chamber 6 is equipped with a pair of vertically sliding second baffles 61. Several pressure sensors 10 for detecting pressure are provided in both the first vacuum chamber 5 and the second vacuum chamber 6. It is also equipped with a drive assembly, which is used to drive the first gate 51 and the second gate 61 to move vertically, so as to realize the alternating switching of the opening and closing states of vacuum chamber 1 5 and vacuum chamber 2 6; it is also equipped with a vacuum assembly, which is used to extract the air in vacuum chamber 1 5 and vacuum chamber 2 6, so as to form a stable vacuum environment inside the two vacuum chambers.

[0023] The base 1 provides support for the entire device, and its top is tightly fitted and fixed to the bottom of the vacuum chamber 2 to prevent shaking during operation. The feeding part 3 and the discharging part 4 are respectively connected to the two ends of the vacuum chamber 2 to realize the inlet and outlet conveying of packaging bags. Vacuum chamber 1 5 and vacuum chamber 2 6 are sealed and separated by the partition plate inside the vacuum chamber 2 to prevent air from communicating between the two chambers. The first baffle 51 and the second baffle 61 are respectively sealed and cooperate with the inlet and outlet of the corresponding chamber. When sliding, the chamber can be fully opened and closed. The pressure sensors 10 are evenly distributed on the inner wall of the two chambers, which can capture and feedback the pressure changes in the chamber in real time. The drive component can synchronously link the first baffle 51 and the second baffle 61 to ensure that the opening and closing states of the two chambers are complementary. The vacuum component can quickly extract air from the chamber to maintain the stable vacuum environment required for detection.

[0024] The drive assembly includes: a first transmission rod 52, a first concave seat 53, a first traction rod 54, a second transmission rod 62, a second concave seat 63, and a second traction rod 64.

[0025] The first transmission rod 52 is fixedly mounted on the top of the two first stop gates 51; the first concave seat 53 is fixedly mounted on the vertical side wall of the first transmission rod 52; the first traction rod 54 is rotatably mounted on the first concave seat 53 via a pin; the second transmission rod 62 is fixedly mounted on the top of the two second stop gates 61; the second concave seat 63 is fixedly mounted on the vertical side wall of the second transmission rod 62; the second traction rod 64 is rotatably mounted on the second concave seat 63 via a pin. The two ends of the first transmission rod 52 are welded and fixed to the top of the two first stop gates 51 respectively, allowing the two first stop gates 51 to slide vertically synchronously. The first concave seat 53 is integrally fixed to the side wall of the first transmission rod 52, and its internal pin can rotate flexibly, providing a stable rotation fulcrum for the first traction rod 54, causing the first transmission rod 52 to move synchronously with the first traction rod 54. The second transmission rod 62 has the same structure as the first transmission rod 52. Both ends are fixed to the top of the two second stop gates 61, which can realize the synchronous sliding of the second stop gates 61. The second concave seat 63 is firmly connected to the second transmission rod 62. Its installation position corresponds to the first concave seat 53. It is adapted to the installation of the second traction rod 64. The second traction rod 64 is rotatably engaged with the second concave seat 63 through a pin, which can transmit power to drive the second transmission rod 62 to move up and down.

[0026] The drive assembly also includes: mounting plate 7, connecting plate 71, and mounting plate 7.

[0027] A pair of mounting plates 7 are fixedly installed on the top of the vacuum chamber 2; a connecting plate 71 is rotatably mounted on the mounting plate 7 via pins, and both ends of the connecting plate 71 are rotatably connected to the first traction rod 54 and the second traction rod 64 via pins respectively. The pair of mounting plates 7 are symmetrically distributed on both sides of the top of the vacuum chamber 2 and are welded and fixed to the top of the vacuum chamber 2, providing stable rotational support for the connecting plate 71. The connecting plate 71 is rotatably engaged with the mounting plate 7 via a central pin, and the pins at both ends are respectively embedded into the ends of the first traction rod 54 and the second traction rod 64 to achieve power linkage transmission.

[0028] The drive assembly also includes: lifting rod 521, horizontal plate 522, lifting screw 524, servo motor 523, and material transfer fixture.

[0029] The lifting rod 521 is fixedly connected to the first transmission rod 52; the horizontal plate 522 is fixedly installed on the vertical outer wall of the vacuum chamber 2; the lifting screw 524 is rotatably installed at the bottom of the horizontal plate 522, and the lifting rod 521 and the lifting screw 524 are threadedly connected; the servo motor 523 is fixedly installed at the top of the horizontal plate 522, and the servo motor 523 is used to drive the lifting screw 524 to rotate; the material transfer fixture is used to move the packaging bag to be inspected, and cooperates with the opening and closing actions of the first gate 51 and the second gate 61 to complete the feeding and discharging operation. The lifting rod 521 is vertically fixed to the first transmission rod 52, and has an internal thread that matches the external thread of the lifting screw 524. The horizontal plate 522 is tightly fixed to the side wall of the vacuum chamber 2. The bottom bearing seat supports the rotation of the lifting screw 524. The output shaft of the servo motor 523 is fixed to the top of the lifting screw 524, which can control the rotation parameters. The material transfer fixture and the gate action are synchronized to realize continuous feeding and discharging.

[0030] The material transfer fixture includes: a settling tank 9, a conveyor roller 92, and a conveyor belt 91.

[0031] The settling troughs 9 are respectively located inside vacuum chamber 5 and vacuum chamber 6; pairs of conveyor rollers 92 are rotatably mounted inside the settling troughs 9, with one of the drive rollers 92 in one pair extending to the outside of vacuum chamber 2; a conveyor belt 91 is matched with the conveyor rollers 92. The opening of the settling trough 9 is flush with the inner wall of the vacuum chamber to avoid obstructing the movement of the packaging bags. The two ends of the conveyor rollers 92 are connected to the inner wall of the settling trough 9 through bearings, and the extended ends are used to receive power. The conveyor belt 91 is fitted over the outside of the conveyor rollers 92, and its flat surface can smoothly drive the packaging bags to move.

[0032] The material transfer fixture also includes: ratchet 5241, first rotating rod 5242, first spur gear 5243, connecting shaft 5244, pawl 5245, and torsion spring 5246.

[0033] Ratchet 5241 is coaxially fixed at the bottom end of lifting screw 524; first rotating rod 5242 is rotatably mounted on the top of base 1; first spur gear 5243 is fixedly sleeved on the top end of first rotating rod 5242; several connecting shafts 5244 are arranged in a ring array on the top of first spur gear 5243; pawl 5245 is rotatably sleeved on connecting shaft 5244, and pawl 5245 and ratchet 5241 are correspondingly arranged; torsion spring 5246 is fixedly sleeved on connecting shaft 5244, and both ends of torsion spring 5246 are fixedly connected to first spur gear 5243 and pawl 5245 respectively. The ratchet 5241 rotates synchronously with the lifting screw 524. The bottom end of the first rotating rod 5242 is connected to the bearing of the base 1. The first spur gear 5243 is tightly fixed to the first rotating rod 5242. The connecting shaft 5244 is vertically fixed to the top of the first spur gear 5243. The pawl 5245 can rotate around the connecting shaft 5244 and fit against the ratchet 5241. The torsion spring 5246 provides a reset force for the pawl 5245.

[0034] The material transfer fixture also includes: a first bevel gear 921, a second rotating rod 922, a second spur gear 923, and a second bevel gear 924.

[0035] The first bevel gear 921 is coaxially fixedly mounted on the extension end of the conveyor roller 92; the second rotating rod 922 is rotatably mounted on the top of the base 1; the second spur gear 923 is fixedly mounted on the top of the second rotating rod 922, and the second spur gear 923 meshes with the first spur gear 5243; the second bevel gear 924 is coaxially fixed on the top of the second spur gear 923, and the second bevel gear 924 meshes with the first bevel gear 921. The first bevel gear 921 rotates synchronously with the conveyor roller 92, the second rotating rod 922 is connected to the base 1 through a bearing, the second spur gear 923 meshes with the first spur gear 5243 to transmit power, and the second bevel gear 924 meshes with the first bevel gear 921 to realize the conversion of power direction to drive the conveyor roller 92 to rotate.

[0036] The vacuum assembly includes a vacuum pump 8 and a ventilation pipe 81.

[0037] Vacuum pump 8 is fixedly installed on the top of vacuum chamber 2; vent pipe 81 is adapted and connected to vacuum pump 8, and vent pipe 81 is connected to both vacuum chamber 5 and vacuum chamber 6. Vacuum pump 8 is bolted to the top of vacuum chamber 2, ensuring stable operation and good sealing. The main body of vent pipe 81 is fixed to the air inlet end of vacuum pump 8, and branch pipes are connected to vacuum chamber 5 and vacuum chamber 6 respectively, allowing simultaneous or individual evacuation of the two chambers.

[0038] The vacuum assembly also includes a first evacuation valve 811 and a second evacuation valve 812.

[0039] The first suction valve 811 is connected in parallel to a branch pipe of the vent pipe 81, and is correspondingly positioned to the air inlet of vacuum chamber 5. The second suction valve 812 is connected in parallel to a branch pipe of the vent pipe 81, and is correspondingly positioned to the air inlet of vacuum chamber 6. The first suction valve 811 and the second suction valve 812 control the opening and closing of their respective branch pipes, which can be used to meet the alternating detection requirements of the two chambers, and independently control the suction status of vacuum chamber 5 and vacuum chamber 6 to ensure the stability of the vacuum environment.

[0040] The vacuum chamber 2 is provided with several guide ramps 21, which are corresponding to the vacuum chamber 5, vacuum chamber 6, feeding section 3, and discharging section 4. A glass window 11 for easy observation is fixedly installed on the vacuum chamber 2. The guide ramps 21 have a smooth transition surface, connecting the feeding section 3, the two vacuum chambers, and the discharging section 4 respectively, guiding the packaging bag to enter and exit smoothly. The glass window 11 is made of transparent sealed glass, which is sealed to the inner wall of the vacuum chamber 2, allowing clear observation of the testing status inside the chamber.

[0041] The functional principle of this invention can be explained through the following operational methods: Taking vacuum chamber 5 as an example, the feeding and discharging operations are performed. The servo motor 523 drives the lifting screw 524 to rotate in the forward direction. The first gate 51 moves up to open vacuum chamber 5, and the second gate 61 moves down to close vacuum chamber 6. The rotation of the lifting screw 524 drives the ratchet 5241 to rotate. The pawl 5245 meshes with the ratchet 5241 to drive the first spur gear 5243 to rotate. The power is transmitted to the conveyor roller 92 through the second spur gear 923, the second bevel gear 924, and the first bevel gear 921. The conveyor belt 91 rotates accordingly. The packaging bag to be inspected enters the vacuum chamber 5 through the feeding section 3 and the guide slope 21. When the packaging bag moves to the middle position inside vacuum chamber 5, the servo motor 523 pauses rotation. After a short wait, the packaging bag in vacuum chamber 6 is inspected. The servo motor 523 drives the lifting screw 524 to rotate in the reverse direction, the first gate 51 moves down to close vacuum chamber 5, and the second gate 61 moves up to open vacuum chamber 6. The conveyor belt 91 rotates and sends the inspected packaging bag out of vacuum chamber 6 via guide slope 21 and discharge section 4. After the packaging bag in vacuum chamber 5 is inspected, the servo motor 523 drives the lifting screw 524 to rotate in the forward direction again, the first gate 51 moves up to open vacuum chamber 5, and the conveyor belt 91 rotates and sends out the inspected packaging bag. At the same time, a new packaging bag to be inspected enters vacuum chamber 5, thus realizing the alternating inspection and feeding of the two chambers. It should be noted that the conveyor rollers 92 in vacuum chamber 1 5 and vacuum chamber 2 6 are fixedly installed to ensure the coordinated operation of the conveyor belt 91; the first rotating rod 5242 is provided with a certain damping to prevent it from rotating on its own or being driven to rotate when the ratchet 5241 flips, which would affect the subsequent use of the conveyor belt 91.

[0042] The vacuum pump 8, in conjunction with the alternating switching of the first suction valve 811 and the second suction valve 812, operates to pump air into a vacuum. The specific process is as follows: When the first stop valve 51 moves down to close the first vacuum chamber 5 and the second stop valve 61 moves up to open the second vacuum chamber 6, the first suction valve 811 is opened and the second suction valve 812 is closed. The vacuum pump 8 then draws air from the first vacuum chamber 5 through the vent pipe 81. The pressure sensor 10 monitors the pressure value inside the first vacuum chamber 5 in real time. If there is air leakage in the packaging bag inside the first vacuum chamber 5, the pressure sensor 10 will detect an increase in the pressure value, thus determining that the packaging bag is leaking. After the packaging bag in vacuum chamber 5 has been inspected, the first suction valve 811 is closed and the second suction valve 812 is opened. The vacuum pump 8 extracts air from vacuum chamber 6, and the pressure sensor 10 monitors the pressure change in vacuum chamber 6. At this time, vacuum chamber 5 completes the discharge and feeding operations. After vacuum chamber 6 has been inspected, the opening and closing state of the suction valve is switched again to realize the alternating vacuum inspection of the two chambers, which improves the overall inspection efficiency in conjunction with the feeding process.

[0043] This equipment drives the lifting screw 524 to rotate via the servo motor 523, which in turn drives the first gate 51 and the second gate 61 to switch between open and closed states. The material transfer fixture realizes the feeding of packaging bags under the power drive of the lifting screw 524. The vacuum pump 8 and the air extraction valve work together to complete the vacuuming operation of the two chambers. The pressure sensor 10 monitors the pressure change to determine whether the packaging bag is leaking air, and finally realizes efficient and stable air leakage detection of pre-packaged food packaging bags.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A leak detection device for pre-packaged food bags, comprising a base (1), a vacuum chamber (2) fixed to the top of the base (1), and a feeding section (3) and a discharging section (4) configured in conjunction with the vacuum chamber (2), characterized in that, The vacuum chamber (2) is divided into a vacuum chamber one (5) and a vacuum chamber two (6). The vacuum chamber one (5) is equipped with a pair of vertically sliding first doors (51), and the vacuum chamber two (6) is equipped with a pair of vertically sliding second doors (61). Both the vacuum chamber one (5) and the vacuum chamber two (6) are equipped with a number of pressure sensors (10) for detecting pressure. It is also equipped with a drive assembly, which is used to drive the first gate (51) and the second gate (61) to move vertically, so as to realize the alternating switching of the opening and closing states of the first vacuum chamber (5) and the second vacuum chamber (6); It is also equipped with a vacuum assembly, which is used to extract air from the first vacuum chamber (5) and the second vacuum chamber (6) to create a stable vacuum environment inside the two vacuum chambers.

2. The air leakage detection device for pre-packaged food bags according to claim 1, characterized in that, The driving component includes: The first transmission rod (52) is fixedly installed on the top of the two first stop gates (51); The first concave seat (53) is fixedly mounted on the vertical side wall of the first transmission rod (52); The first traction rod (54) is rotatably mounted on the first concave seat (53) via a pin. The second transmission rod (62) is fixedly installed on the top of the two second stop gates (61); The second concave seat (63) is fixedly mounted on the vertical side wall of the second transmission rod (62); The second traction rod (64) is rotatably mounted on the second concave seat (63) via a pin.

3. The air leakage detection device for pre-packaged food bags according to claim 2, characterized in that, The driving component also includes: Mounting plates (7), a pair of mounting plates (7) are fixedly installed on the top of the vacuum chamber (2); The connecting plate (71) is rotatably mounted on the mounting plate (7) via a pin, and both ends of the connecting plate (71) are rotatably connected to the first traction rod (54) and the second traction rod (64) respectively via pins.

4. The air leakage detection device for pre-packaged food bags according to claim 3, characterized in that, The driving component also includes: The lifting rod (521) is fixedly connected to the first transmission rod (52); A horizontal plate (522) is fixedly installed on the vertical outer wall of the vacuum chamber (2); The lifting screw (524) is rotatably mounted at the bottom of the horizontal plate (522), and the lifting rod (521) and the lifting screw (524) are threadedly connected. A servo motor (523) is fixedly mounted on the top of the horizontal plate (522), and the servo motor (523) is used to drive the lifting screw (524) to rotate. The material transfer fixture is used to move the packaging bag to be tested, and cooperate with the opening and closing action of the first gate (51) and the opening and closing action of the second gate (61) to complete the feeding and discharging operation.

5. The air leakage detection device for pre-packaged food bags according to claim 4, characterized in that, The material transfer fixture includes: Settling tank (9), settling tank (9) is respectively opened inside the first vacuum chamber (5) and the second vacuum chamber (6); The conveyor rollers (92) are rotatably disposed in the settling trough (9), and one of the conveyor rollers (92) in the pair extends to the outside of the vacuum chamber (2); The conveyor belt (91) and the drive roller (92) are configured together.

6. The air leakage detection device for pre-packaged food bags according to claim 5, characterized in that, The material transfer fixture also includes: Ratchet (5241) is coaxially fixed at the bottom end of the lifting screw (524); The first rotating rod (5242) is rotatably mounted on the top of the base (1); The first spur gear (5243) is fixedly sleeved on the top of the first rotating rod (5242); Connecting shaft (5244), a plurality of connecting shafts (5244) are arranged in a ring array on top of the first spur gear (5243); Pawl (5245), pawl (5245) is rotatably sleeved on the connecting shaft (5244), and pawl (5245) and ratchet (5241) are correspondingly arranged; Torsion spring (5246) is fixedly sleeved on the connecting shaft (5244), and both ends of the torsion spring (5246) are fixedly connected to the first spur gear (5243) and the pawl (5245) respectively.

7. The air leakage detection device for pre-packaged food bags according to claim 6, characterized in that, The material transfer fixture also includes: The first bevel gear (921) is coaxially fixed at the extension end of the conveyor roller (92); The second rotating rod (922) is rotatably mounted on the top of the base (1); The second spur gear (923) is fixedly mounted on the top of the second rotating rod (922), and the second spur gear (923) meshes with the first spur gear (5243); The second bevel gear (924) is coaxially fixed on the top of the second spur gear (923), and the second bevel gear (924) meshes with the first bevel gear (921).

8. The air leakage detection device for pre-packaged food bags according to claim 1, characterized in that, The vacuum assembly includes: A vacuum pump (8) is fixedly installed on the top of the vacuum chamber (2); Vent pipe (81) is adapted to be connected to the vacuum pump (8), and vent pipe (81) is connected to both vacuum chamber one (5) and vacuum chamber two (6).

9. A pre-packaged food packaging bag leakage detection device according to claim 8, characterized in that, The vacuum assembly also includes: The first air extraction valve (811) is connected to a branch pipe of the air inlet pipe (81), and the first air extraction valve (811) is correspondingly set to the air inlet end of the vacuum chamber (5). The second air extraction valve (812) is connected to a branch pipe of the air inlet pipe (81), and the second air extraction valve (812) is correspondingly set to the air inlet end of the vacuum chamber (6).

10. The air leakage detection device for pre-packaged food bags according to claim 1, characterized in that, The vacuum chamber (2) is provided with several guide slopes (21), and the guide slopes (21) are corresponding to the first vacuum chamber (5), the second vacuum chamber (6), the feeding part (3) and the discharging part (4). The vacuum chamber (2) is fixedly provided with a glass window (11) for easy observation.

Images