A lidded bag detection apparatus

Abstract

The utility model relates to a kind of bag detection devices after closing lid, including moving plate, distance sensor or contact sensor and reset component, the moving plate is installed in the base of vacuum machine and moves up and down on base upper surface, the distance sensor or contact sensor is embedded in the installation groove of top cover and towards moving plate, the moving plate conventional state protrudes base upper surface, the reset component is used to reset moving plate, the distance sensor or contact sensor judges whether there is bag body by inductive moving plate, by the cooperation of moving plate and off sensor or contact sensor, the judgment of whether there is bag body is realized, prevent the case of vacuum machine heat seal component empty burning.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum machine technology, specifically relating to a bag detection device after the bag is closed. Background Technology

[0002] Currently, vacuum packaging machines are widely used in the packaging of food, electronic components, chemical products and other fields. They mainly extend the shelf life of products or provide protection by vacuuming and heat sealing.

[0003] Existing vacuum sealers typically consist of a base and an openable cover. The base houses a vacuum chamber and a heat-sealing assembly. During operation, the user places the opening of a package containing the item into the vacuum chamber area of ​​the base, then closes the cover; the equipment automatically performs vacuuming and heat-sealing. However, in actual use, there is a problem of "dry vacuuming" due to operational negligence. Specifically, when the cover is closed, the vacuum chamber between the base and the cover may not contain the package to be processed. Even in this case, the equipment will still perform the vacuuming and heat-sealing process. This not only wastes energy and time, but more seriously, during dry vacuuming, the heat-sealing assembly may directly heat and pressurize the sealing surface of the base or cover. Long-term or frequent dry vacuuming can easily lead to abnormal wear and aging of the heat-sealing assembly, and even damage to the sealing material on the surface of the base or cover, affecting the sealing performance of the vacuum chamber, thus reducing the product packaging pass rate and increasing equipment maintenance costs and downtime.

[0004] Some existing vacuum machines lack an effective bag detection mechanism, making it impossible to accurately determine whether a bag is present after the lid is closed and before starting key processes. This makes it impossible to fundamentally avoid the occurrence of empty vacuuming. In view of this, this solution was developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a bag detection device after the lid is closed, which can detect whether there is a bag after the vacuum machine is closed.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a bag detection device after the lid is closed, including a moving plate, a distance sensor or a contact sensor and a reset component. The moving plate is installed in the base of the vacuum machine and moves up and down on the upper surface of the base. The distance sensor or contact sensor is embedded in the mounting groove of the top cover and faces the moving plate. The moving plate extends out of the upper surface of the base in its normal state. The reset component is used to reset the moving plate. The distance sensor or contact sensor determines whether there is a bag by sensing the moving plate.

[0007] Furthermore, the distance sensor is an ultrasonic distance sensor.

[0008] Furthermore, the contact sensor employs a micro switch.

[0009] Furthermore, the upper surface of the movable plate is chamfered at both ends.

[0010] Furthermore, the bag detection device is applied to a vacuum machine, which includes a base and a cover plate. The upper surface of the base is provided with a receiving groove, and the moving plate is slidably connected to the receiving groove. The cover plate is formed with a mounting groove corresponding to the receiving groove, and the distance sensor or contact sensor is disposed in the mounting groove.

[0011] Furthermore, the bottom of the receiving groove extends into the inner cavity of the base, and the lower end of the moving plate forms an extension plate extending into the inner cavity.

[0012] Furthermore, the reset component is a spring, which is located inside the base of the vacuum machine and its upper end face is in contact with the lower surface of the moving plate.

[0013] Furthermore, a first vacuum groove is formed on the upper surface of the base, and a second vacuum groove corresponding to the first vacuum groove is formed on the lower surface of the cover plate. After the base and the cover plate are closed, the first vacuum groove and the second vacuum groove are sealed to form a vacuum chamber.

[0014] Furthermore, a protruding post is formed inside the first vacuum groove, and an air extraction hole is formed on the upper surface of the protruding post.

[0015] Furthermore, a heat-sealing groove is formed on the upper surface of the base, a heat-sealing assembly is disposed in the heat-sealing groove, and a convex strip corresponding to the heat-sealing groove is formed on the lower surface of the cover plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: When the bag is placed on the vacuum machine and the machine closes its lid, the bag will block the moving plate from entering the mounting groove of the lid. The distance sensor or contact sensor will then fail to detect the presence of the moving plate. In this state, the vacuum machine's control components will determine that a bag has entered the vacuum machine and can execute the operation command. When the lid is closed, the distance sensor or contact sensor will detect the presence of the moving plate, indicating that no bag has entered the vacuum machine. Even if the operator presses the operation button, the vacuum machine will not issue any operation command, preventing the heat-sealing components from burning out. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a vacuum machine that can detect the presence of a bag after the lid is closed, according to this utility model. Figure 2 This is a three-dimensional structural diagram of a vacuum machine that can detect the presence of a bag after the lid is closed, according to another direction of this utility model. Figure 3This is a cross-sectional view of the movable plate located within the base in this utility model. Figure 4 This is a three-dimensional structural diagram of the movable plate in this utility model; Figure 5 This is a bottom view of the cover plate in this utility model.

[0018] The markings in the diagram are: 1. Base; 11. Receiving groove; 12. First vacuum groove; 13. Heat sealing assembly; 14. Protruding post; 141. Evacuation hole; 15. Positioning post; 2. Cover plate; 21. Second vacuum groove; 22. Protruding strip; 23. Mounting groove; 3. Bag detection device; 31. Moving plate; 311. Extension plate; 32. Contact sensor; 33. Spring; 4. Annular sealing groove. Detailed Implementation

[0019] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0020] like Figures 1-5 As shown, this embodiment provides a vacuum machine that can detect the presence of a bag after the lid is closed, including a base 1, a cover plate 2, and a bag detection device 3.

[0021] A receiving groove 11 is provided on the upper surface of the base 1, and the movable plate 31 is slidably connected to the base 1 through the receiving groove 11. The bottom of the receiving groove 11 extends into the inner cavity of the base 1, and the lower end of the movable plate 31 forms an extension plate 311 extending into the inner cavity. The reset assembly uses a spring 33, which is located in the inner cavity of the base 1 and its upper end face contacts the lower surface of the extension plate 311 of the movable plate 31, so that the movable plate 31 remains in the position of extending out of the upper surface of the base 1 in the normal state. Preferably, a positioning post 15 is formed on the bottom surface of the inner cavity of the base 1, and the spring 33 is sleeved on the positioning post 15.

[0022] Preferably, the upper surface of the movable plate 31 is provided with chamfers at both ends to prevent the corners from piercing the bag.

[0023] The lower surface of the cover plate 2 has a mounting groove 23 corresponding to the receiving groove 11. A distance sensor or contact sensor 32 is embedded in the mounting groove 23 and faces the moving plate 31. When a distance sensor is selected, since most bags are transparent, an ultrasonic distance sensor is used. In this embodiment, a contact sensor 32 is used as the sensing component. In this embodiment, the contact sensor 32 is a microswitch, and there are six microswitches spaced apart.

[0024] The upper surface of the base 1 also has a first vacuum groove 12 and a heat sealing groove, with the heat sealing groove located at the front end of the first vacuum groove 12. A protrusion 14 is formed inside the first vacuum groove 12, and an air extraction hole 141 is formed on the upper surface of the protrusion 14.

[0025] A heat-sealing assembly 13 is installed inside the heat-sealing groove. The hot air assembly adopts a common heat-sealing structure for sealing machines, such as a heating wire combined with a heat-conducting plate. A second vacuum groove 21 corresponding to the first vacuum groove 12 and a protrusion 22 corresponding to the heat-sealing groove are formed on the lower surface of the cover plate 2.

[0026] Preferably, an annular sealing groove 4 is formed at the outer edge of the first vacuum groove 12 and the second vacuum groove 21, and the annular sealing groove 4 is used to install a sealing ring.

[0027] When the vacuum machine is closed, after the base 1 and the cover plate 2 are closed, the first vacuum groove 12 and the second vacuum groove 21 are sealed to form a vacuum chamber, and at the same time the protrusion 22 abuts against the bag body to adhere to the heat sealing assembly 13.

[0028] Working process: When a bag is placed, the bag will block the moving plate 31 from entering the mounting groove 23 of the cover plate 2. The contact sensor 32 cannot detect the moving plate 31. The control system determines that a bag is present and allows the vacuuming and heat sealing operations to be performed. Moreover, due to the cooperation of the protrusion 22 and the heat sealing assembly 13, as well as the weight of the contents inside the bag, the bag within the range of the moving plate 31 will be in a taut state. There will be no situation where the bag and the moving plate 31 are pushed into the mounting groove 23 together due to the restoring force of the spring 33.

[0029] When no bag is placed, the moving plate 31 can be normally inserted into the mounting slot 23. The contact sensor 32 is triggered by the moving plate 31, and the control system determines that there is no bag and prohibits the vacuuming and heat sealing operations to prevent the heat sealing component 13 from burning dry.

[0030] This embodiment effectively solves the problem of vacuum pumping by combining a simple mechanical structure with a sensor, thereby improving the service life and reliability of the equipment.

[0031] The foregoing has shown and described the basic principles and main features of this invention, as well as its advantages. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope. All such changes and modifications fall within the scope of this invention as defined by the appended claims and their equivalents.

Claims

1. A bag detection device after the lid is closed, characterized in that: It includes a moving plate, a distance sensor or a contact sensor, and a reset assembly. The moving plate is installed in the base of the vacuum machine and moves up and down on the upper surface of the base. The distance sensor or contact sensor is embedded in the mounting groove of the top cover and faces the moving plate. The moving plate extends out of the upper surface of the base in its normal state. The reset assembly is used to reset the moving plate. The distance sensor or contact sensor determines whether there is a bag by sensing the moving plate.

2. The bag detection device after the lid is closed according to claim 1, characterized in that: The distance sensor is an ultrasonic distance sensor.

3. The bag detection device after the lid is closed according to claim 1, characterized in that: The contact sensor uses a micro switch.

4. The bag detection device after the lid is closed according to claim 1, characterized in that: The upper surface of the movable plate has chamfers at both ends.

5. The bag detection device after the lid is closed according to claim 1, characterized in that: The bag detection device is applied to a vacuum machine, which includes a base and a cover plate. The upper surface of the base is provided with a receiving groove, and the moving plate is slidably connected to the receiving groove. The cover plate is formed with a mounting groove corresponding to the receiving groove, and the distance sensor or contact sensor is installed in the mounting groove.

6. The bag detection device after the lid is closed according to claim 5, characterized in that: The bottom of the receiving groove extends into the inner cavity of the base, and the lower end of the movable plate forms an extension plate extending into the inner cavity.

7. The bag detection device after the lid is closed according to claim 6, characterized in that: The reset component is a spring, which is located inside the base of the vacuum machine and its upper end face is in contact with the lower surface of the moving plate.

8. The bag detection device after the lid is closed according to claim 5, characterized in that: A first vacuum groove is formed on the upper surface of the base, and a second vacuum groove corresponding to the first vacuum groove is formed on the lower surface of the cover plate. After the base and the cover plate are closed, the first vacuum groove and the second vacuum groove are sealed to form a vacuum chamber.

9. The bag detection device after the lid is closed according to claim 8, characterized in that: A protruding post is formed inside the first vacuum tank, and an air extraction hole is formed on the upper surface of the protruding post.

10. The bag detection device after the lid is closed according to claim 5, characterized in that: A heat-sealing groove is formed on the upper surface of the base, and a heat-sealing component is disposed in the heat-sealing groove. A convex strip corresponding to the heat-sealing groove is formed on the lower surface of the cover plate.

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