Leakage detection device and system for shacha ma packaging bag
By combining an optical detection cover and an optical camera with negative pressure suction technology, the problem of accuracy in detecting minute leaks in Sachima packaging bags has been solved, enabling efficient and accurate leak identification and classified transportation, while reducing equipment energy consumption and the probability of jamming.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHANGZHOU JIALIYUAN FOOD CO LTD
- Filing Date
- 2026-03-30
- Publication Date
- 2026-06-09
AI Technical Summary
Existing technologies struggle to accurately identify minute leaks in Sachima packaging bags, and current detection methods cannot simultaneously and efficiently differentiate between leaks caused by inadequate sealing and minute leaks in packaging bags under negative pressure.
The system employs an optical detection cover and an optical camera combined with negative pressure suction technology. The optical camera captures changes in light reflected from the strip light panel onto the surface of the packaging bag, while the air pressure sensor monitors the negative pressure environment to identify minor leaks. The system also uses a limit plate and a negative pressure shaft structure to classify and transport leaking bags.
It achieves accurate leakage detection of Sachima packaging bags, can identify poor adhesion and minor leakage, improves detection accuracy, and reduces equipment power consumption and jamming probability through structural design, thereby improving equipment stability and energy efficiency.
Smart Images
Figure CN122171135A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical detection technology, specifically to a leakage detection device and system for Sachima packaging bags. Background Technology
[0002] Sachima is a type of food pastry that needs to be sealed in packaging bags after production. If the packaging bags leak, because Sachima contains oil and sugar, it is easy to oxidize, turn yellow, and change taste after being exposed to air, directly shortening its shelf life and failing to meet food safety standards.
[0003] Therefore, in the current business context, all enterprises need to detect whether Sachima packaging bags are leaking. Under existing technology, there are two main detection methods. One is to directly take a picture of the Sachima packaging bag with an optical camera and use algorithms to compare and confirm whether the packaging is damaged. This method is efficient, but it is difficult to detect leakage caused by poor adhesion. The other method is to place the Sachima packaging bag in a negative pressure environment and detect whether the packaging bag bulges by visual inspection or position sensors. This method has the advantage of higher detection accuracy, but it cannot identify micro-leakage problems. When there is a micro-leakage point in the packaging bag, the packaging bag will bulge synchronously in the negative pressure environment and slowly deflate and recover. The short-term rough judgment by visual inspection or position sensors cannot accurately identify this situation. Summary of the Invention
[0004] The purpose of this invention is to provide a leakage detection device and system for Sachima packaging bags to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a leakage detection device for Sachima packaging bags, comprising a smooth moving belt and an optical detection cover capable of moving up and down relative to the smooth moving belt. The Sachima packaging bag is positioned above the smooth moving belt and is conveyed by the smooth moving belt. The optical detection cover has openings at the top and bottom, and the upper opening is sealed with a glass cover. An optical camera and a strip light panel with angle adjustment function are disposed above the glass cover. An air extraction pipe and a calibration pressure sensor are connected to the optical detection cover. During detection, the optical detection cover moves down and cooperates with the smooth moving belt to form a closed space. Air is extracted through the air extraction pipe, causing the internal negative pressure of the optical detection cover to cause the Sachima packaging bag to bulge within a safe range. The optical camera captures the changes in light reflected by the strip light panel on the outer surface of the Sachima packaging bag to determine whether the Sachima packaging bag has leaked. During this process, the calibration pressure sensor monitors the negative pressure inside the optical detection cover.
[0006] The optical inspection cover is fixedly equipped with a partition plate. When the optical inspection cover moves down and cooperates with the light surface moving belt to form a closed environment, the partition plate separates the Sachima packaging bag. The partition plates are equipped with push plates, and a negative pressure shaft is fixedly installed on the push plate. The negative pressure shaft passes through the side wall of the optical inspection cover and extends to the outside of the optical inspection cover. The negative pressure shaft and the side wall of the optical inspection cover are in sealed contact.
[0007] A shaft end ring is fixedly provided at the end of the negative pressure shaft. A first spring is provided between the shaft end ring and the outer surface of the optical detection cover. The first spring applies pressure to the shaft end ring, causing the push plate to tend to move in the direction of the shaft end ring.
[0008] A locking lug is fixedly provided on the outside of the shaft end ring. A limit plate is provided on the side of the locking lug facing the push plate. The limit plate can move up and down. When the limit plate is in the rising state, it can block the locking lug and restrict the locking lug from moving in the direction of the push plate. When the optical camera determines that the Sachima packaging bag is leaking, the limit plate at the corresponding position of the Sachima packaging bag moves down.
[0009] An electromagnetic backplate is fixedly installed at the bottom of the limiting plate. A vertical limiting shell is installed outside the electromagnetic backplate to limit the electromagnetic backplate. A fixed base plate is fixedly installed at the bottom of the vertical limiting shell, and a spring shaft is fixedly installed on the fixed base plate. A spring pressure plate is fixedly installed on the electromagnetic backplate, and the spring shaft passes through the spring pressure plate. A second spring is installed below the spring pressure plate to provide upward support force to the spring pressure plate. An end stop is fixedly installed at the upper end of the spring shaft to limit the spring pressure plate. An electromagnet module is fixedly installed inside the vertical limiting shell. When the electromagnet module is energized, it can generate magnetic force to attract the electromagnetic backplate to move downward against the elastic force of the second spring.
[0010] One side of the smooth moving belt is provided with a leakage chute and a complete chute. The sachima packaging bag that leaks falls into the leakage chute, while the sachima packaging bag that does not leak falls into the complete chute.
[0011] The negative pressure shaft has a cylindrical inner cavity; an inertial slide is installed inside the cylindrical inner cavity, and a movable ball is rolled and embedded on the outer surface of the inertial slide. The inertial slide makes rolling contact with the inner wall surface of the cylindrical inner cavity through the movable ball.
[0012] An inner wall fixing ring is also fixedly installed on the inner wall of the cylindrical cavity. A third spring is installed between the inner wall fixing ring and the inertial slide. Under the elastic pressure of the third spring, the inertial slide is located at one end of the inner cavity of the cylinder, close to the push plate.
[0013] The smooth moving belt is internally fitted with rigid ribs. Several sets of rigid ribs are arranged and evenly distributed along the length of the smooth moving belt. The axis of the rigid ribs is perpendicular to the moving direction of the smooth moving belt.
[0014] A leakage detection system for Sachima packaging bags includes a leakage detection device and a negative pressure extraction module, characterized in that: the negative pressure extraction module is connected to an air extraction pipe, and the negative pressure extraction module extracts air through the air extraction pipe to cause the internal negative pressure of the optical detection cover to cause the Sachima packaging bag to bulge within a safe range.
[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The leakage detection device for Sachima packaging bags of the present invention uses an optical camera to detect the change in the reflection pattern of light emitted from a strip light panel on the outer surface of the Sachima packaging bag under negative pressure to determine whether a leakage problem has occurred. Compared with the existing technology of directly visually identifying whether the packaging bag is damaged by an optical camera, it can identify problems of poor adhesion and has higher accuracy. Compared with the existing technology that also tests in a negative pressure environment but only judges whether the Sachima packaging bag bulges in a negative pressure environment, the present invention uses an optical camera to capture the reflected light in an active state when a bulging Sachima packaging bag has a slight air leakage, thereby determining that there is a leak and accurately identifying the phenomenon of slight air leakage.
[0016] 2. The present invention, through the combination of a push plate, a negative pressure shaft and a limiting insert plate, can push and adjust the position of the Sachima packaging bag on the smooth moving belt after detecting a leak, so that the leaking Sachima packaging bag and the non-leaking Sachima packaging bag fall into the leakage chute or the intact chute respectively, thus achieving classification. Furthermore, through the structural design, only a small amount of electricity is needed to control the descent of the limit plate, which enables the negative pressure shaft to use negative pressure to perform long-distance axial pushing action, thereby improving the utilization rate of negative pressure inside the optical inspection cover, reducing equipment power consumption, and making it more energy-efficient and environmentally friendly. Moreover, when the negative pressure shaft is released, it can effectively reduce the negative pressure intensity in the optical inspection cover and reduce the backflow noise when the optical inspection cover is depressurized.
[0017] 3. The present invention, through the combination of a cylindrical inner cavity, an inertial sliding hammer, and a third spring, can effectively reduce the probability of jamming when the negative pressure shaft uses negative pressure to drive the material pushing action, thereby improving the stability of the equipment. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.
[0019] Figure 2 This is another schematic diagram of the overall structure of the present invention.
[0020] Figure 3 This is a partial schematic diagram of the present invention.
[0021] Figure 4 This is a side view of the overall structure of the present invention.
[0022] Figure 5 This is a three-dimensional half-sectional schematic diagram of the present invention.
[0023] Figure 6 This is a schematic diagram of the structure at the negative pressure shaft of the present invention.
[0024] Figure 7 This is a three-dimensional half-section diagram of the negative pressure shaft of the present invention.
[0025] Figure 8 This is a schematic diagram of the partition plate structure of the present invention.
[0026] Figure 9 This is a cross-sectional view of the smooth moving zone of the present invention.
[0027] In the diagram: 1. Smooth moving belt; 2. Optical detection cover; 3. Glass cover plate; 4. Strip light panel; 5. Optical camera; 6. Air extraction pipe; 7. Calibration pressure sensor; 201. Separator plate; 202. Push plate; 203. Negative pressure shaft; 204. Shaft end ring; 205. First spring; 206. Locking ear; 207. Limiting insert plate; 208. Electromagnetic back plate; 209. Vertical limiting shell; 210. Fixed base plate; 211. Spring shaft; 212. Spring pressure plate; 213. Second spring; 214. End plate. 215. Baffle plate; 216. Electromagnet module; 217. Leakage chute; 218. Complete chute; 8. Cylindrical inner cavity; 801. Inertia slide weight; 802. Moving ball bearing; 803. Inner wall fixing ring; 804. Third spring; 110. Ribbed shaft; 101. Moving belt bracket; 102. Roller shaft section; 103. Cross-braced side plate; 104. Chute bracket; 105. Lifting vertical shaft; 106. Integrated upper frame; 107. Positioning slide sleeve; 108. I-beam pressure plate; 109. Lifting control cylinder; 218. Sealing ring. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] Please see Figures 1 to 9This invention provides a technical solution: a leakage detection device for Sachima packaging bags, comprising a smooth moving belt 1 and an optical detection cover 2 capable of moving up and down relative to the smooth moving belt 1, such as... Figure 2 As shown, the smooth moving belt 1 has a moving belt support 101 inside, and at least two sets of roller shafts 102 are installed on the moving belt support 101. The roller shafts 102 provide rolling support for the smooth moving belt 1. The roller shafts 102 are driven by a motor. When the roller shafts 102 rotate, they can drive the smooth moving belt 1 to rotate synchronously, thereby causing the Sachima packaging bag placed above the smooth moving belt 1 to be conveyed and moved. The Sachima packaging bag is positioned above the smooth moving belt 1 and conveyed by the smooth moving belt 1. Figure 2 As shown, a lifting shaft 105 is fixedly mounted on the movable support 101, and an integrated upper frame 106 is fixedly mounted above the optical inspection cover 2. A positioning sleeve 107 is fixedly mounted on the surface of the integrated upper frame 106. The lifting shaft 105 passes through the positioning sleeve 107 for limiting movement. Through the sliding cooperation between the positioning sleeve 107 and the lifting shaft 105, the optical inspection cover 2 and the integrated upper frame 106 can move up and down stably. An I-beam pressure plate 108 is fixedly mounted on the upper end of the lifting shaft 105. A lifting control cylinder 109 is fixedly mounted on the I-beam pressure plate 108 by bolts. The telescopic shaft of the lifting control cylinder 109 is fixed to the integrated upper frame 106. The lifting control cylinder 109 drives the integrated upper frame 106 to move up and down relative to the I-beam pressure plate 108, thereby driving the optical inspection cover 2 to move up and down. The optical inspection cover 2 has openings at the top and bottom, and the upper opening is closed by a glass cover plate 3.
[0030] An optical camera 5 and an angle-adjustable strip light panel 4 are mounted above the glass cover 3. The placement of the glass cover 3 allows both the optical camera 5 and the strip light panel 4 to be located outside the optical detection cover 2, thereby minimizing the volume of the optical detection cover 2. This enables the required negative pressure intensity to be reached more quickly during negative pressure extraction, improving detection efficiency and energy saving. The surface coating of the glass cover 3 includes an anti-reflective coating to reduce the impact of the glass cover 3.
[0031] An air extraction pipe 6 and a calibration pressure sensor 7 are connected to the optical detection cover 2. During detection, the optical detection cover 2 moves downwards and cooperates with the light surface moving belt 1 to form a closed space. Air is extracted through the air extraction pipe 6, creating a negative pressure inside the optical detection cover 2, causing the Sachima packaging bag to inflate within a safe range. The optical camera 5 captures the changes in light reflected from the strip light panel 4 onto the outer surface of the Sachima packaging bag to determine whether the Sachima packaging bag has leaked. During this process, the calibration pressure sensor 7 monitors the negative pressure inside the optical detection cover 2. Figure 1As shown, a sealing ring 218 is glued to the bottom of the optical inspection cover 2. When the optical inspection cover 2 moves down and contacts the smooth surface moving belt 1, the sealing ring 218 is located between the optical inspection cover 2 and the smooth surface moving belt 1, which enhances the sealing performance and reduces the probability of air leakage when the optical inspection cover 2 is under negative pressure.
[0032] The aforementioned safety range refers to the maximum pressure resistance determined through multiple experiments based on the material strength of the Sachima packaging bag, ensuring that the bag does not over-expand and rupture. This invention utilizes optical reflection detection, making it suitable for Sachima packaging bags with smooth outer surfaces, thus guaranteeing testing accuracy.
[0033] like Figure 8 As shown, a partition plate 201 is fixedly installed inside the optical inspection cover 2. Several sets of partition plates 201 are arranged evenly. When the optical inspection cover 2 moves down and cooperates with the light surface moving belt 1 to form a closed environment, the partition plates 201 separate the Sachima packaging bag. Push plates 202 are provided between the partition plates 201. A negative pressure shaft 203 is fixedly installed on the push plate 202. The negative pressure shaft 203 passes through the side wall of the optical inspection cover 2 and extends to the outside of the optical inspection cover 2. The negative pressure shaft 203 and the side wall of the optical inspection cover 2 are in sealed contact.
[0034] A shaft end ring 204 is fixedly provided at the end of the negative pressure shaft 203. A first spring 205 is provided between the shaft end ring 204 and the outer surface of the optical detection cover 2. The first spring 205 applies pressure to the shaft end ring 204, causing the push plate 202 to have a tendency to move in the direction of the shaft end ring 204.
[0035] A locking ear 206 is fixedly provided on the outside of the shaft end ring 204. A limit plate 207 is provided on the side of the locking ear 206 facing the position of the push plate 202. The limit plate 207 can move up and down. When the limit plate 207 is in the rising state, it can block the locking ear 206 and restrict the locking ear 206 from moving in the direction of the push plate 202. When the optical camera 5 determines that the Sachima packaging bag has leaked, the limit plate 207 at the corresponding position of the Sachima packaging bag moves down.
[0036] An electromagnetic backplate 208 is fixedly installed at the bottom of the limiting plate 207. A vertical limiting shell 209 is installed outside the electromagnetic backplate 208 to limit the electromagnetic backplate 208. A fixed base plate 210 is fixedly installed at the bottom of the vertical limiting shell 209, and a spring shaft 211 is fixedly installed on the fixed base plate 210. Figure 2 As shown, a cantilevered side plate 103 is welded and fixedly installed on the movable support bracket 101, as... Figure 3 As shown, the fixed base plate 210 is fixedly installed on the cantilever side plate 103 by bolts.
[0037] A spring pressure plate 212 is fixedly installed on the electromagnetic back plate 208. A spring shaft 211 passes through the spring pressure plate 212. A second spring 213 is installed below the spring pressure plate 212. The second spring 213 provides an upward supporting force to the spring pressure plate 212. An end baffle 214 is fixedly installed at the upper end of the spring shaft 211. The end baffle 214 limits the spring pressure plate 212. An electromagnet module 215 is fixedly installed inside the vertical limiting shell 209. When the electromagnet module 215 is energized, it can generate magnetic force to attract the electromagnetic back plate 208 to move downward against the elastic force of the second spring 213.
[0038] One side of the smooth moving belt 1 is provided with a leakage chute 216 and a complete chute 217. Leaking Sachima packaging bags fall into the leakage chute 216, while non-leaking Sachima packaging bags fall into the complete chute 217. Figure 2 As shown, a slide bracket 104 is also fixedly mounted on the movable belt support 101 by bolts. The slide bracket 104 is welded to the complete slide 217 and the leaking slide 216, thereby providing fixed support for the complete slide 217 and the leaking slide 216.
[0039] The negative pressure shaft 203 has a cylindrical inner cavity 8 inside, and an inertial slide 801 is provided inside the cylindrical inner cavity 8. The outer surface of the inertial slide 801 is rolled and embedded with a movable ball 802, and the inertial slide 801 makes rolling contact with the inner wall surface of the cylindrical inner cavity 8 through the movable ball 802.
[0040] An inner wall fixing ring 803 is also fixedly installed on the inner wall of the cylindrical inner cavity 8. A third spring 804 is installed between the inner wall fixing ring 803 and the inertial slide 801. Under the elastic pressure of the third spring 804, the inertial slide 801 is located at one end inside the cylindrical inner cavity 8 near the push plate 202.
[0041] like Figure 9 As shown, a rigid rib shaft 110 is embedded inside the smooth moving belt 1. Several sets of rigid rib shafts 110 are arranged and evenly distributed along the length direction of the smooth moving belt 1. The axis of the rigid rib shaft 110 is perpendicular to the moving direction of the smooth moving belt 1. By embedding the rigid rib shaft 110 inside the smooth moving belt 1, after the optical detection cover 2 is pressed on top of the smooth moving belt 1, the two sides of the optical detection cover 2 will press against the two ends of the rigid rib shaft 110. When performing negative pressure detection, it can prevent the smooth moving belt 1 from bulging upward under the negative pressure attraction. At the same time, the axis of the rigid rib shaft 110 is perpendicular to the moving direction of the smooth moving belt 1, so it does not affect the conveying movement of the smooth moving belt 1.
[0042] A leakage detection system for Sachima packaging bags includes a leakage detection device and a negative pressure extraction module. The system is characterized in that the negative pressure extraction module is connected to an air extraction pipe 6. The negative pressure extraction module is a high-power negative pressure device in the prior art, which can quickly extract negative pressure. The negative pressure extraction module extracts air through the air extraction pipe 6, causing the internal negative pressure of the optical detection cover 2 to cause the Sachima packaging bag to bulge within a safe range.
[0043] In use, the upstream feeding device positions the Sachima packaging bags onto the smooth moving belt 1 at a fixed rhythm. The movement of the smooth moving belt 1 ensures a constant spacing between the Sachima packaging bags. Figure 8 As shown, when the optical detection cover 2 moves down, it can correspond to the position of the partition plate 201, so that the Sachima packaging bag is exactly between the two sets of partition plates 201.
[0044] By extending the lifting control cylinder 109, the optical inspection cover 2 and the integrated upper frame 106 are driven to move downward, so that the optical inspection cover 2 covers the smooth moving belt 1. The optical inspection cover 2 and the smooth moving belt 1 cooperate to form a closed space, and the Sachima packaging bag is located in the closed space and is separated by the partition plate 201.
[0045] The negative pressure extraction module draws air through the extraction pipe 6 to create a negative pressure inside the optical detection cover 2. When the optical detection cover 2 is under negative pressure, the Sachima packaging bag will bulge if there is no leakage. If the Sachima packaging bag has a tiny leak, it will bulge first, and then continue to collapse as a small amount of air is released.
[0046] The strip light panel 4 of this invention consists of continuous light strips. The light reflected from these strips is reflected onto the bulging, rounded packaging bag of Sachima, resulting in a smooth light path and continuous grayscale or texture in the image. In contrast, the Sachima packaging bag without bulging has an uneven surface, causing disordered light reflection and a discontinuous light path, which can be accurately identified by the optical camera 5 using a visual algorithm.
[0047] The key point is that when the Sachima packaging bag in the bulging state has a small leak, it is in a continuous state of collapse as the small amount of air is released. Since the positions of the strip light plate 4 and the optical camera 5 are fixed, when the Sachima packaging bag collapses slightly, the light path will move significantly, amplifying this action. Thus, when the optical camera 5 detects the significant movement of the light path on the surface of the bulging Sachima packaging bag, it is determined to be a small leak.
[0048] The above determination requires the elimination of external interference. This invention uses a calibration pressure sensor 7 for calibration. The calibration pressure sensor 7 detects whether the internal negative pressure of the optical detection cover 2 is stable. When the optical detection cover 2 itself leaks air, causing the internal negative pressure of the optical detection cover 2 to be unstable, the optical camera 5 detects obvious activity on the surface of the bulging Sachima packaging bag, but does not determine it as a minor leak. At this time, a fault warning is issued.
[0049] After detecting a leaked Sachima packaging bag, the electromagnet module 215 is briefly energized, causing the corresponding limit plate 207 to briefly move downwards. Figure 3 As shown, when the electromagnet module 215 is energized, the electromagnetic backplate 208 is driven downwards by magnetic force, causing the limiting plate 207 to move downwards. The locking ear 206 then loses the limiting obstruction of the limiting plate 207. Because the interior of the optical detection cover 2 is under negative pressure, and by designing and controlling the elastic force and contact friction of the first spring 205, the negative pressure can attract and drive the negative pressure shaft 203 to overcome the elastic force of the first spring 205 and move axially towards the interior of the optical detection cover 2. Figure 5 As shown, the negative pressure inside the optical detection cover 2 drives the negative pressure shaft 203 to move the push plate 202 to the right, thereby adjusting the position of the Sachima packaging bag. This allows the leaking Sachima packaging bag to move to the area corresponding to the leakage chute 216. As the subsequent smooth moving belt 1 continues to transport the bag, the leaking Sachima packaging bag can fall into the leakage chute 216.
[0050] When the optical detection cover 2 moves upward, the internal negative pressure of the optical detection cover 2 disappears. Under the reset force of the first spring 205, the negative pressure shaft 203 will move away from the optical detection cover 2 and reset to the initial state. Thus, when the optical detection cover 2 moves downward again, the limiting plate 207 will limit the locking ear 206 again.
[0051] The above structural design requires only a small amount of power to control the descent of the limit plate 207, which enables the negative pressure shaft 203 to use negative pressure to perform a long-distance axial pushing action, making it more energy-efficient and environmentally friendly. Furthermore, after the negative pressure shaft 203 performs the axial pushing action, it can effectively reduce the negative pressure intensity in the optical inspection cover 2, thereby reducing the return air noise of the optical inspection cover 2.
[0052] like Figure 5 , Figure 6 and Figure 7As shown, during the process of the negative pressure shaft 203 moving axially towards the interior of the optical detection cover 2 to push the material, the degree of compression of the first spring 205 gradually increases, and the reset force it provides also increases synchronously. At the same time, as the negative pressure shaft 203 moves towards the interior of the optical detection cover 2, the internal negative pressure of the optical detection cover 2 gradually decreases. Therefore, the driving force on the negative pressure shaft 203 gradually weakens. In addition, after the push plate 202 comes into contact with the Sachima packaging bag, it needs to push it to move. Therefore, the negative pressure shaft 203 is prone to jamming.
[0053] By setting the inertial slide weight 801, the initial reset force of the first spring 205 is relatively weak, while the negative pressure of the optical detection cover 2 is relatively high. Under this state of strong overall driving force, such as... Figure 7 As shown, the negative pressure shaft 203 moves rapidly to the right in the early stage. At this time, the inertial slide 801 moves to the left relative to the negative pressure shaft 203 under the action of inertia, and the third spring 804 is elastically compressed.
[0054] Once the negative pressure shaft 203 gets stuck and cannot continue to move to the right, the inertial slide 801, under the elastic force of the third spring 804, will move to the right relative to the negative pressure shaft 203 to reset. This causes the inertial slide 801 to strike the end of the inner wall of the cylindrical cavity 8, applying a rightward impact force to the negative pressure shaft 203. This allows the negative pressure shaft 203 to automatically attempt to break free from the jamming. Actual testing has shown that this greatly reduces the probability of the negative pressure shaft 203 getting stuck, making the shaft movement of the negative pressure shaft 203 under negative pressure drive smoother.
[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A leakage detection device for Sachima packaging bags, comprising a smooth moving belt and an optical detection cover capable of moving up and down relative to the smooth moving belt, wherein the Sachima packaging bag is positioned above the smooth moving belt and conveyed by the smooth moving belt, characterized in that: The optical detection cover has openings at the top and bottom, and the upper opening is sealed with a glass cover. An optical camera and a strip light panel with angle adjustment function are installed above the glass cover. An air extraction pipe and a calibration pressure sensor are connected to the optical detection cover. During detection, the optical detection cover moves down and cooperates with the light surface moving belt to form a closed space. Air is extracted through the air extraction pipe to create a negative pressure inside the optical detection cover, causing the Sachima packaging bag to bulge within a safe range. The optical camera captures the changes in light reflected from the strip light panel on the outer surface of the Sachima packaging bag to determine whether the Sachima packaging bag has leaked. During this process, the negative pressure inside the optical detection cover is monitored by the calibration pressure sensor.
2. The leakage detection device according to claim 1, characterized in that: The optical inspection cover is fixedly equipped with a partition plate. When the optical inspection cover moves down and cooperates with the light surface moving belt to form a closed environment, the partition plate separates the Sachima packaging bag. The partition plates are provided with push plates between each other, and a negative pressure shaft is fixedly installed on the push plate. The negative pressure shaft passes through the side wall of the optical detection cover and extends to the outside of the optical detection cover. The negative pressure shaft and the side wall of the optical detection cover are in sealed contact.
3. The leakage detection device according to claim 2, characterized in that: A shaft end ring is fixedly provided at the end of the negative pressure shaft. A first spring is provided between the shaft end ring and the outer surface of the optical detection cover. The first spring applies pressure to the shaft end ring, causing the push plate to tend to move in the direction of the shaft end ring.
4. The leakage detection device according to claim 3, characterized in that: The shaft end ring is fixedly provided with a locking ear. A limit plate is provided on the side of the locking ear facing the push plate. The limit plate can move up and down. When the limit plate is in the rising state, it can block the locking ear and restrict the locking ear from moving in the direction of the push plate. When the optical camera determines that a Sachima packaging bag is leaking, the limiting plate at the corresponding position of the Sachima packaging bag moves downward.
5. The leakage detection device according to claim 4, characterized in that: An electromagnetic backplate is fixedly installed at the bottom of the limiting plate, and a vertical limiting shell is installed on the outside of the electromagnetic backplate. The electromagnetic backplate is limited by the vertical limiting shell. A fixed base plate is fixedly installed at the bottom of the vertical limiting shell, and a spring shaft is fixedly installed on the fixed base plate. A spring pressure plate is fixedly installed on the electromagnetic back plate, and a spring shaft passes through the spring pressure plate. A second spring is installed below the spring pressure plate, which provides upward support force to the spring pressure plate. An end stop is fixedly installed at the upper end of the spring shaft, which limits the spring pressure plate. An electromagnet module is fixedly installed inside the vertical limiting shell. When the electromagnet module is energized, it can generate magnetic force, attracting the electromagnetic back plate to move downward against the elastic force of the second spring.
6. The leakage detection device according to claim 1, characterized in that: One side of the smooth moving belt is provided with a leakage chute and a complete chute. The sachima packaging bag that leaks falls into the leakage chute, while the sachima packaging bag that does not leak falls into the complete chute.
7. The leakage detection device according to claim 2, characterized in that: The negative pressure shaft has a cylindrical inner cavity inside; An inertial slide is installed inside the cylindrical cavity, and a movable ball is rolled and embedded on the outer surface of the inertial slide. The inertial slide makes rolling contact with the inner wall surface of the cylindrical cavity through the movable ball.
8. The leakage detection device according to claim 7, characterized in that: An inner wall fixing ring is also fixedly installed on the inner wall of the cylindrical cavity. A third spring is installed between the inner wall fixing ring and the inertial slide. Under the elastic pressure of the third spring, the inertial slide is located at one end of the inner cavity of the cylinder, close to the push plate.
9. The leakage detection device according to claim 1, characterized in that: The smooth moving belt is internally fitted with rigid ribs. Several sets of rigid ribs are arranged and evenly distributed along the length of the smooth moving belt. The axis of the rigid ribs is perpendicular to the moving direction of the smooth moving belt.
10. A leakage detection system for Sachima packaging bags, comprising the leakage detection device and negative pressure extraction module as described in any one of claims 1-9, characterized in that: The negative pressure extraction module is connected to the air extraction pipe. The negative pressure extraction module extracts air through the air extraction pipe, causing the internal negative pressure of the optical detection cover to cause the Sachima packaging bag to bulge within a safe range.