Metal detection equipment with magnetic field shielding device

Abstract

The utility model provides metal detection equipment with a magnetic field shielding device, which comprises a metal detection head, a first shielding case and a second shielding case, and is characterized in that the first shielding case is fixed at one end part of a detection window of the metal detection head and surrounds one end part area of the detection window; and the second shielding cover is fixed at the other end part of the detection window of the metal detection head and surrounds the area of the other end part of the detection window. The shielding covers are installed on the two sides of the magnetic field window of the metal detection head, the structure is simple, installation is convenient, and the anti-interference capability of the metal detection head of the metal detection and weighing all-in-one machine to an external magnetic field can be improved. According to the metal detection equipment, shielding of an external magnetic field can be realized only by installing the magnetic field shielding mechanical device on the metal detection and weighing all-in-one machine, and improvement of the anti-interference capability of the metal detection head is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of product detection, in particular to a metal detection device with a magnetic field shielding device. Background Art

[0002] In the existing technology, the integrated metal detection and weighing machine is a metal detection and weight detection machine, mainly composed of a metal detection part, a weight sorting part, and a conveying and rejection device. Among them, the metal detection part is actually the "gantry" of the metal detector, which is the core of the metal detection.

[0003] When an object containing metal passes through the "gantry", an alarm will be issued. The metal detector is composed of a control circuit and a coil, and the coil is used to generate a stable electromagnetic field.

[0004] When a metal object passes through a stable magnetic field, it disrupts the field's equilibrium because it cuts through the electromagnetic field's lines of force, causing a slight current change within the coil. This current is amplified by a current amplifier circuit, sampled, and processed by a microprocessor, which then issues commands to the control output circuit.

[0005] At present, metal detection and weighing machines are widely used in food, medicine, chemical and other fields. They can be used for metal foreign body detection and product weighing to ensure food safety and measurement regulations.

[0006] For foreign metal object detection, we typically install a metal detector head on the conveyor. By arranging the metal areas of the entire machine and strategically arranging the areas affected by dynamic and static metal, we prevent interference with the metal detector head from both dynamic and static metal. When products with foreign objects pass through the metal detector head, the magnetic field and current in the metal detector head coil change, leading to the detection of unqualified products. After the foreign object detection signal is output, the metal detector weighing machine will process the product with the foreign metal object, either shutting down the machine with an alarm or rejecting it.

[0007] However, in reality, in addition to the normal magnetic field emitted by the metal detector, various electromagnetic fields are present on the production line due to the numerous devices installed. For example, when the control box receives and sends signals, when workshop personnel use walkie-talkies, when operators near the metal detector use their mobile phones, or when objects with metal components are moved near the metal detector window by mistake, these can easily change and interfere with the magnetic field envelope formed by the metal detector. This can affect the sensitivity of the metal detector and even cause false alarms. In severe cases, the production line cannot operate normally, resulting in certain economic losses.

[0008] If you want to improve the anti-interference ability of the metal detection head, you need to make major changes in the software algorithm and structure, which will consume a lot of manpower, material and resources.

[0009] In view of this, the inventors of the present application have designed a metal detection device with a magnetic field shielding device in order to overcome the above technical problems. Utility Model Content

[0010] The technical problem to be solved by the present invention is to overcome the defects in the prior art that there are various electromagnetic fields on the production line, which easily change and interfere with the magnetic field envelope formed by the metal detection head, resulting in false alarms, and to provide a metal detection device with a magnetic field shielding device.

[0011] The utility model solves the above technical problems through the following technical solutions:

[0012] A metal detection device with a magnetic field shielding device, characterized in that the metal detection device includes a metal detection head, a first shielding cover and a second shielding cover, wherein the first shielding cover is fixed to one end of a detection window of the metal detection head and surrounds an end area of ​​the detection window;

[0013] The second shielding cover is fixed to the other end of the detection window of the metal detection head, and surrounds the other end area of ​​the detection window.

[0014] According to one embodiment of the present invention, the metal detection equipment is an integrated metal detection and weighing machine.

[0015] According to an embodiment of the present invention, the first shielding cover and the second shielding cover are ring-shaped.

[0016] According to one embodiment of the present invention, one side of the opening of the first shielding cover and one side of the opening of the second shielding cover are both provided with an inner turning edge; the other side of the opening of the first shielding cover and the other side of the opening of the second shielding cover are both provided with an outer turning edge;

[0017] The inner flange is tightly fitted to the side position of the detection window of the metal detection head.

[0018] According to an embodiment of the present invention, a plurality of first reinforcing ribs are provided on the first shielding cover, and a plurality of second reinforcing ribs are provided on the second shielding cover.

[0019] According to an embodiment of the present invention, the first shielding cover, the metal detection head and the second shielding cover are connected and fixed by at least one insulating connecting rod to form an integrated structure;

[0020] The middle portion of the insulating connecting rod is located above the metal detection head, and both ends of the insulating connecting rod are connected to the first shielding cover and the second shielding cover respectively.

[0021] According to an embodiment of the present invention, the insulating connecting rod has a concave portion, and the metal detection head is accommodated in the concave portion.

[0022] According to an embodiment of the present invention, a plurality of first welding studs are provided on the first shielding cover and the second shielding cover, and a plurality of oblong holes are provided on the insulating connecting rod;

[0023] The oblong hole of the insulating connecting rod is matched and connected with the first welding stud, so that the insulating connecting rod connects the first shielding cover and the second shielding cover.

[0024] According to one embodiment of the present invention, the metal detection device further comprises a fixed frame, and the metal detection head is arranged on the fixed frame;

[0025] Insulation spacers are installed at the bottom of the first shielding cover and the second shielding cover, second welding studs are provided on the fixed frame, and the insulation spacers are installed and fixed on the corresponding second welding studs.

[0026] According to an embodiment of the present invention, the metal detection device further includes a weighing table, which passes through the windows of the first shielding cover, the metal detection head and the second shielding cover and is arranged on the fixed frame.

[0027] The positive progress effect of this utility model is:

[0028] This utility model provides a metal detection device with a magnetic field shielding device. Shielding covers are installed on both sides of the magnetic field window of the metal detection head. The device has a simple structure and is easy to install. It can improve the metal detection head's ability to resist interference from external magnetic fields in a metal detection and weighing machine. The metal detection device only needs to install the magnetic field shielding mechanism on the metal detection and weighing machine to achieve external magnetic field shielding, which helps improve the metal detection head's ability to resist interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals represent the same features throughout, wherein:

[0030] Figure 1 This is a structural schematic diagram of a metal detection device with a magnetic field shielding device according to the present invention.

[0031] Figure 2 This is a structural schematic diagram of the first shielding cover or the second shielding cover in the metal detection equipment with a magnetic field shielding device of the present invention.

[0032] Figure 3This is a schematic diagram of the lower installation structure of the first shielding cover or the second shielding cover in the metal detection equipment with a magnetic field shielding device of the present invention.

[0033] Figure 4 The figure is a schematic diagram of the installation structure of the first shielding cover or the second shielding cover and the insulating connecting rod in the metal detection equipment with a magnetic field shielding device of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0036] In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article.

[0037] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0038] like Figures 1 to 4 As shown, the present invention discloses a metal detection device with a magnetic field shielding device, which includes a metal detection head 10, a first shielding cover 20, and a second shielding cover 30. The first shielding cover 20 is fixed to one end of the detection window of the metal detection head 10, enclosing the end area of ​​the detection window. The second shielding cover 30 is fixed to the other end of the detection window of the metal detection head 10, enclosing the other end area of ​​the detection window.

[0039] Preferably, if Figure 1 As shown, the metal detection device in this embodiment is a metal detection and weighing integrated machine. Taking this as an example, it can of course also be a metal detector or a device with a metal detection head, which is not limited here.

[0040] When the metal detection equipment is a metal detector and weighing machine, it also includes a fixed frame 40 and a weighing table 50. The metal detection head 10 is bolted to the fixed frame 40. The metal detection head 10 is arranged in the middle of the fixed frame 40 to detect metal foreign objects. The weighing table 50 is installed on the fixed frame 40 and is arranged on the fixed frame 1 through the windows of the first shielding cover 20, the metal detection head 10, and the second shielding cover 30.

[0041] Combined Figure 2 As shown, the first shielding cover 20 and the second shielding cover 30 are annular, that is, similar to a "square" shape. The first shielding cover 20 and the second shielding cover 30 can be made of stainless steel. On one side of the opening of the first shielding cover 20 and on one side of the opening of the second shielding cover 30, there are both inward flanges 60 provided. On the other side of the opening of the first shielding cover 20 and on the other side of the opening of the second shielding cover 30, there are both outward flanges 70 provided. The inward flanges 60 are closely fitted with the side parts of the detection window of the metal detection head 10.

[0042] In this embodiment, after the first shielding cover 20 and the second shielding cover 30 are installed on both sides of the metal detection head 10, they can completely shield the interference of the external magnetic field on the metal detection head 10. The "square" - shaped shielding device can also change the magnetic field envelope of the metal detection head and reduce the interference of the metal moving parts inside the conveyor on the magnetic field of the metal detection head.

[0043] Furthermore, there are multiple first reinforcing ribs 21 provided on the first shielding cover 20. Similarly, there are multiple second reinforcing ribs (not shown in the figure) provided on the second shielding cover 30.

[0044] Preferably, the first reinforcing ribs 21 are located between the inward flange 60 and the outer wall surface of the first shielding cover 20. Similarly, the second reinforcing ribs are located between the inward flange 60 and the outer wall surface of the second shielding cover 30 (not shown in the figure).

[0045] Adopting the above structure, on the one hand, the inward flange 60 can protect the side of the metal detection head 10 from being scratched. On the other hand, when the size of the detection window of the metal detection head 10 is relatively large, the outward flange 70, the inward flange 60 and the reinforcing ribs (such as the first reinforcing ribs 21) can improve the strength and stiffness of the first shielding cover 20 and the second shielding cover 30.

[0046] Combined Figure 1 and Figure 4 As shown, the first shielding cover 20, the metal detection head 10 and the second shielding cover 30 are connected and fixed by at least one insulating connecting rod 80 to form an integral structure. The middle part of the insulating connecting rod 80 is located above the metal detection head 10, and the two end parts of the insulating connecting rod 80 are respectively connected to the first shielding cover 20 and the second shielding cover 30.

[0047] For example, there are multiple first welding studs 90 provided on the first shielding cover 20 and the second shielding cover 30, and there are multiple oblong holes 81 provided on the insulating connecting rod 80. By the cooperation connection of the oblong holes 81 of the insulating connecting rod 80 and the first welding studs 90, the insulating connecting rod connects the first shielding cover and the second shielding cover.

[0048] Preferably, the insulating connecting rod 80 is further provided with a concave portion, which accommodates the metal detection head 10, thereby firmly securing the metal detection head 10 and preventing displacement. For example, the insulating connecting rod 80 can be configured in a "J" shape, affixing to and spanning above the metal detection head 10, and connecting the first shielding cover 20 and the second shielding cover 30 via first weld studs 90. The insulating connecting rod 80 is also provided with an oblong hole 81.

[0049] The bottom windows of the first and second shielding covers 20 and 30 are provided with oblong holes 22, which are perpendicular to the window of the metal detector head 10. The oblong holes 22 and oblong holes 81 are oriented in the same direction. Here, the oblong holes 22 and oblong holes 81 can be used to adjust the first and second shielding covers 20 and 30 together, so that the inner flange 60 is tightly aligned with the side edge of the window of the metal detector head 10.

[0050] In particular, the insulating connecting rod 80 is preferably made of an insulating material. On the one hand, it can protect the surface that is in contact with the top of the metal detection head 10 from being scratched. On the other hand, it can also prevent the first shielding cover 20, the second shielding cover 30 and the metal detection head 10 from forming an eddy current loop, which may cause the metal detection head 10 to be triggered incorrectly.

[0051] Furthermore, the first shielding cover 20 and the second shielding cover 30 are respectively connected to the insulating spacer 100 at the lower part of the window by bolts. The fixed frame 40 is provided with a second welding stud 41, which can be used to position and install the insulating spacer 100.

[0052] In this embodiment, the number of insulating spacers 100 can be set to four and they are made of insulating material. They not only position and support the weight of the first and second shielding covers 20 and 30, but also prevent the first and second shielding covers 20 and 30 from forming eddy current loops with the fixed frame 40, thereby interfering with the electromagnetic field of the metal detection head 10.

[0053] In the metal detection device with a magnetic field shielding device of the present invention, the first shielding cover 20 and the second shielding cover 30 can also be designed as an assemblable structure, for example, it can be divided into a window top, side or bottom, or other deformed structures, which can be easily installed and disassembled.

[0054] In addition, the first shielding cover 20 and the second shielding cover 30 can also be designed as a structure with adjustable height and width to adapt to the size of the window of the metal detection head 10. This structure has higher versatility and is conducive to reducing costs.

[0055] The metal detection equipment with a magnetic field shielding device of the utility model has the following characteristics:

[0056] 1. The metal detection device achieves the function of shielding the external magnetic field of the metal detection head with minimal material cost, has a simple and reliable structure, and can be extended to other similar applications.

[0057] Second, the external magnetic field shielding mechanism is arranged on both sides of the window of the metal detection head. It has a simple structure and is easy to install, which can achieve shielding of the external magnetic field and help improve the anti-interference ability of the metal detection head. Moreover, the shielding mechanism is located outside the metal detection head, and there is no need to modify the internal structure of the metal detection head.

[0058] 3. The "mouth"-shaped shielding device can change the envelope of the metal detection head's magnetic field, reducing the interference of the metal moving parts inside the conveyor on the metal detection head's magnetic field.

[0059] In summary, the present invention's metal detection device with a magnetic field shielding device integrates an external magnetic field shielding mechanism with the metal detection head, resolving the issue of the metal detection head being susceptible to interference from external magnetic fields. The metal detection device simply requires the magnetic field shielding mechanism to be installed on the integrated metal detection and weighing machine to shield against external magnetic fields, thereby improving the metal detection head's anti-interference capabilities.

[0060] For those skilled in the art, the above invention disclosure is intended only as an example and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to this application. Such modifications, improvements, and amendments are suggested in this application and remain within the spirit and scope of the exemplary embodiments of this application.

[0061] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0062] Similarly, it should be noted that, in order to simplify the description of the present disclosure and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of the present disclosure sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of the present disclosure requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than the total features of a single embodiment disclosed above.

[0063] Although specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A metal detection device with a magnetic field shielding device, characterized in that: The metal detection device includes a metal detection head, a first shielding cover and a second shielding cover, wherein the first shielding cover is fixed to one end of the detection window of the metal detection head and surrounds an end area of ​​the detection window; The second shielding cover is fixed to the other end of the detection window of the metal detection head, and surrounds the other end area of ​​the detection window.

2. The metal detection device with a magnetic field shielding device according to claim 1, characterized in that: The metal detection equipment is an integrated metal detection and weighing machine.

3. The metal detection device with a magnetic field shielding device according to claim 1, characterized in that: The first shielding cover and the second shielding cover are ring-shaped.

4. The metal detection device with a magnetic field shielding device according to claim 3, characterized in that: One side of the opening of the first shielding cover and one side of the opening of the second shielding cover are both provided with an inner turning edge; the other side of the opening of the first shielding cover and the other side of the opening of the second shielding cover are both provided with an outer turning edge; The inner flange is tightly fitted to the side position of the detection window of the metal detection head.

5. The metal detection device with a magnetic field shielding device according to claim 4, characterized in that: The first shielding cover is provided with a plurality of first reinforcing ribs, and the second shielding cover is provided with a plurality of second reinforcing ribs.

6. The metal detection device with a magnetic field shielding device according to claim 1, characterized in that: The first shielding cover, the metal detection head and the second shielding cover are connected and fixed by at least one insulating connecting rod to form an integrated structure; The middle portion of the insulating connecting rod is located above the metal detection head, and both ends of the insulating connecting rod are connected to the first shielding cover and the second shielding cover respectively.

7. The metal detection device with a magnetic field shielding device according to claim 6, characterized in that: The insulating connecting rod is provided with a concave portion, and the metal detection head is accommodated in the concave portion.

8. The metal detection device with a magnetic field shielding device according to claim 7, characterized in that: The first shielding cover and the second shielding cover are provided with a plurality of first welding studs, and the insulating connecting rod is provided with a plurality of oblong holes; The oblong hole of the insulating connecting rod is matched and connected with the first welding stud, so that the insulating connecting rod connects the first shielding cover and the second shielding cover.

9. The metal detection device with a magnetic field shielding device according to claim 2, wherein: The metal detection device further comprises a fixed frame, and the metal detection head is arranged on the fixed frame; Insulation spacers are installed at the bottom of the first shielding cover and the second shielding cover, second welding studs are provided on the fixed frame, and the insulation spacers are installed and fixed on the corresponding second welding studs.

10. The metal detection device with a magnetic field shielding device according to claim 9, characterized in that: The metal detection device further includes a weighing table, which passes through the first shielding cover, the metal detection head, and the windows of the second shielding cover and is arranged on the fixed frame.

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