Circuit board oven

Abstract

The utility model discloses a circuit board oven. The circuit board oven comprises an oven body, a conveying device and a magnetic attraction piece. The oven body is provided with a baking cavity; the conveying device is used for conveying products to enable the products to pass through the baking cavity, the conveying device comprises a conveying chain, a driving chain wheel and a driven chain wheel, the conveying chain is in transmission connection with the driving chain wheel and the driven chain wheel, and the conveying chain is made of a ferromagnetic material; the magnetic attraction piece is used for generating a magnetic field to attract magnetic chippings, and at least part of the conveying chain is located within the range of the magnetic field. According to the circuit board oven, the probability that products are polluted by magnetic scraps can be greatly reduced, and the yield of the products is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit board production line especially relates to a circuit board oven. BACKGROUND

[0002] PCB (Printed Circuit Board), Chinese name is printed circuit board, after coating, in order to make the coating solidification, needs oven to bake. After baking, it is found that some PCBs are contaminated, which affects the product yield. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, the utility model provides a circuit board oven, which can improve the product yield.

[0004] The utility model discloses a circuit board oven, the circuit board oven includes:

[0005] The box body has a baking cavity.

[0006] The conveying device is used to convey products to pass through the baking cavity, and the conveying device includes a conveying chain, a driving sprocket and a driven sprocket. The conveying chain is drivingly connected to the driving sprocket and the driven sprocket. The material of the conveying chain is ferromagnetic material.

[0007] The magnetic attraction piece is used to generate a magnetic field to attract magnetic debris. At least part of the conveying chain is within the magnetic field range of the magnetic attraction piece.

[0008] The circuit board oven according to the utility model has the following advantages:

[0009] The conveying chain is made of ferromagnetic material. When conveying products, the conveying chain moves and rubs against the driving sprocket and the driven sprocket, generating magnetic debris. By arranging the magnetic attraction piece, at least part of the conveying chain is within the magnetic field range of the magnetic attraction piece, achieving magnetic attraction of the magnetic debris, thereby greatly reducing the probability of the magnetic debris drifting and contaminating the products.

[0010] According to some embodiments of the utility model, the magnetic attraction piece is an electromagnet.

[0011] According to some embodiments of the utility model, the circuit board oven includes a switching element and a power supply assembly. The power supply assembly is electrically connected to the electromagnet. The switching element is connected between the power supply assembly and the electromagnet to turn on or off the magnetic field.

[0012] According to some embodiments of the utility model, the power supply assembly is an adjustable current power supply, which is used to adjust the magnetic field strength.

[0013] According to some embodiments of the present application, the magnetic attraction member is a permanent magnet.

[0014] According to some embodiments of the present application, the magnetic attraction member is located at the inner side of the conveying chain, and the projection of the magnetic attraction member and the projection of the conveying chain at least partially coincide in the height direction of the box.

[0015] According to some embodiments of the present application, the magnetic attraction member is provided with at least two, one of which is a first magnetic attraction member, and the other is a second magnetic attraction member, the conveying chain and the driven sprocket separation area are within the magnetic field range of the first magnetic attraction member, and the conveying chain and the driven sprocket separation area are within the magnetic field range of the second magnetic attraction member.

[0016] According to some embodiments of the present application, among the plurality of magnetic attraction members, at least one is a third magnetic attraction member, and at least one is a fourth magnetic attraction member.

[0017] In the moving direction of the conveying chain, each of the third magnetic attraction members is arranged between the first magnetic attraction member and the driven sprocket, and each of the fourth magnetic attraction members is arranged between the second magnetic attraction member and the driving sprocket.

[0018] According to some embodiments of the present application, the second magnetic attraction member and each of the fourth magnetic attraction members are arranged in a staggered manner in the height direction of the box with the first magnetic attraction member, and the second magnetic attraction member and each of the fourth magnetic attraction members are arranged in a staggered manner in the height direction of the box with each of the third magnetic attraction members.

[0019] According to some embodiments of the present application, among the plurality of magnetic attraction members, at least one of the magnetic attraction members is a fifth magnetic attraction member, and at least one of the magnetic attraction members is a sixth magnetic attraction member.

[0020] At least part of the meshing area of the conveying chain and the driving sprocket is within the magnetic field range of the fifth magnetic attraction member, and at least part of the meshing area of the conveying chain and the driven sprocket is within the magnetic field range of the sixth magnetic attraction member.

[0021] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0023] Figure 1 The structure of the circuit board oven of the present application is shown in the schematic diagram;

[0024] Figure 2The structure schematic view of the conveying device and the magnetic member of the circuit board oven.

[0025] Reference signs:

[0026] 100, box body;

[0027] 200, conveying device; 210, conveying chain; 220, driving sprocket; 230, driven sprocket;

[0028] 300, magnetic member; 310, first magnetic member; 320, second magnetic member; 330, third magnetic member; 340, fourth magnetic member;

[0029] 10, product. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0034] In the description of the present utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] In the related art, the coated PCB board needs to be baked by an oven, wherein the oven is provided with a conveying component for conveying the PCB board. Since the use temperature of the oven is high, the conveying component generally adopts iron chain or steel chain. Small iron filings are generated due to friction during the use of the chain, which pollutes the PCB board.

[0036] For this purpose, please refer to Figure 1 and Figure 2 The present embodiment provides an oven for circuit board, which comprises a cabinet 100, a conveying device 200 and a magnetic attraction member 300.

[0037] The cabinet 100 has a baking cavity, and the product 10 is baked in the baking cavity.

[0038] The conveying device 200 is used to convey the product 10 so that the product 10 passes through the baking cavity. The product 10 includes a PCB board and other products 10 that need to reduce the possibility of magnetic debris pollution during baking, such as FCBGA board (Flip Chip Ball Grid Array). The product 10 can enter the baking cavity for baking under the conveying of the conveying device 200, and move in the baking cavity until it is removed from the baking cavity to end the baking.

[0039] The conveying device 200 comprises a conveying chain 210, a driving sprocket 220 and a driven sprocket 230, and the conveying chain 210 is drivingly connected to the driving sprocket 220 and the driven sprocket 230. It can be understood that the driving sprocket 220 is connected to a driving assembly, and the driving sprocket 220 is driven to rotate by the driving assembly. The conveying chain 210 is engaged with the driving sprocket 220 and the driven sprocket 230. The driving sprocket 220 rotates to drive the conveying chain 210 to move, thereby achieving the movement of the product 10 arranged on the conveying chain 210. It can be understood that, during the transmission process, friction and collision will occur between the driving sprocket 220, the driven sprocket 230 and the conveying chain 210. Since the material of the conveying chain 210 is a ferromagnetic material, the above friction and collision process will generate magnetic debris. It needs to be further explained here that the material of the conveying chain 210 is a ferromagnetic material, which can be an alloy containing a large amount of iron elements, such as iron and steel, so as to be able to be magnetically adsorbed. In some embodiments, the driving sprocket 220 and the driven sprocket 230 are also made of ferromagnetic material.

[0040] The magnetic attraction member 300 is used to generate a magnetic field to adsorb the magnetic debris. At least part of the conveying chain 210 is in the magnetic field range of the magnetic attraction member 300. It can be understood that when the conveying chain 210 moves into the above-mentioned magnetic field range, the magnetic debris attached thereto can be adsorbed by the magnetic attraction member 300.

[0041] In the above-mentioned embodiments, when the product 10 is conveyed, the conveying chain 210 moves and rubs against the driving sprocket 220 and the driven sprocket 230, which generates magnetic debris. By arranging the magnetic attraction member 300, at least part of the conveying chain 210 is in the magnetic field range of the magnetic attraction member 300, so as to achieve the magnetic adsorption of the above-mentioned magnetic debris, thereby greatly reducing the probability of the above-mentioned magnetic debris drifting and contaminating the product 10.

[0042] It can be understood that the type of the magnetic attraction member 300 is not limited, as long as it can magnetically adsorb the magnetic debris. In some embodiments, the magnetic attraction member 300 is a permanent magnet, so as to reduce the cost.

[0043] In other embodiments, the magnetic attraction member 300 is an electromagnet. The electromagnet can use the magnetic field generated by the current passing through the wire to attract the magnetic debris. The stability of the magnetic field of the electromagnet in a high-temperature environment is relatively better.

[0044] The following will be described taking the electromagnet as an example.

[0045] In some embodiments, the circuit board oven comprises a switching element and a power supply assembly. The power supply assembly is electrically connected to the electromagnet, and the switching element is connected between the power supply assembly and the electromagnet to turn on or turn off the magnetic field. In this way, the current of the electromagnet can be cut off by the switching element, so that the electromagnet stops generating a magnetic field, or the electromagnet is connected to the power supply assembly by the switching element to provide the current of the electromagnet to generate a magnetic field, thereby adsorbing the magnetic debris.

[0046] It should be noted that the normally open electromagnet is easy to magnetize the surrounding components, affecting the normal operation of the equipment. Selective opening or closing of the electromagnet can reduce the impact on the surrounding parts.

[0047] The power supply assembly can be selected as an adjustable current power supply. The adjustable current power supply can adjust the current through an adjustable power supply module or an adjustable resistor, thereby adjusting the magnetic field strength of the electromagnet. In this way, the magnetic field of the electromagnet can be adjusted to the appropriate strength as needed.

[0048] The magnetic attraction piece 300 can be arranged on either side of the conveying chain 210, so that at least part of the conveying chain 210 is within the magnetic field range. In some embodiments, the magnetic attraction piece 300 is located on the inner side of the conveying chain 210. Along the height direction of the box body 100, the projection of the magnetic attraction piece 300 partially overlaps the projection of the conveying chain 210.

[0049] Specifically, the conveying chain 210 forms a closed loop structure, and the conveying chain 210 of the closed loop structure has an inner side and an outer side. The magnetic attraction piece 300 is located on the inner side of the conveying chain 210. Along the height direction of the box body 100, the projection of the magnetic attraction piece 300 partially overlaps the projection of the conveying chain 210. That is, part or all of the magnetic attraction piece 300 is directly above or below the conveying chain 210.

[0050] It should be noted that the magnetic debris is generated by the friction between the conveying chain 210 and the gear, and the friction mainly occurs on the inner side surface of the conveying chain 210. The magnetic attraction piece 300 is located on the inner side of the conveying chain 210, and along the height direction of the box body 100, the projection of the magnetic attraction piece 300 at least partially overlaps the projection of the conveying chain 210. This can more directly attract the magnetic debris and achieve better attraction effect.

[0051] The magnetic attraction piece 300 can be arranged on the L-shaped fixing block, and the L-shaped fixing block is fixed to the box body 100.

[0052] It can be understood that the number and installation position of the magnetic attraction piece 300 are not limited and can be adjusted as needed in actual use.

[0053] In some embodiments, the magnetic attraction piece 300 is provided with at least two, one of which is a first magnetic attraction piece 310, and the other is a second magnetic attraction piece 320. The first magnetic attraction piece 310 is arranged at a position where the conveying chain 210 is separated from the driving sprocket 220, and the second magnetic attraction piece 320 is arranged at a position where the conveying chain 210 is separated from the driven sprocket 230. The first magnetic attraction piece 310 can attract the magnetic debris at the position where the conveying chain 210 is separated from the driving sprocket 220, and the second magnetic attraction piece 320 can attract the magnetic debris at the position where the conveying chain 210 is separated from the driven sprocket 230.

[0054] Specifically, the conveying chain 210 is a closed ring, and the friction and impact between the conveying chain 210 and the driving sprocket 220 will generate magnetic debris. After the conveying chain 210 separates from the driving sprocket 220, the magnetic debris will easily adhere to the product 10 when the conveying chain 210 moves towards the driven sprocket 230. By arranging the first magnetic member 310 at the position where the conveying chain 210 separates from the driving sprocket 220, the magnetic debris generated by the friction between the conveying chain 210 and the driving sprocket 220 can be directly adsorbed, thereby reducing the probability of the product 10 being contaminated by the magnetic debris. Similarly, the friction and impact between the conveying chain 210 and the driven sprocket 230 will generate magnetic debris, and after the conveying chain 210 separates from the driven sprocket, the magnetic debris will easily adhere to the product 10 when the conveying chain 210 moves towards the driving sprocket 220. By arranging the second magnetic member 320 at the position where the conveying chain 210 separates from the driven sprocket 230, the magnetic debris can be directly adsorbed, thereby reducing the probability of the product 10 being contaminated by the magnetic debris.

[0055] In some embodiments, among the plurality of magnetic members 300, at least one is a third magnetic member 330, and at least another one is a fourth magnetic member 340.

[0056] In the moving direction of the conveying chain 210, each third magnetic member 330 is arranged between the first magnetic member 310 and the driven sprocket 230, and each fourth magnetic member 340 is arranged between the second magnetic member 320 and the driving sprocket 220. The third magnetic member 330 is used to adsorb the magnetic debris on the conveying chain 210 between the first magnetic member 310 and the driven sprocket 230, and the fourth magnetic member 340 is used to adsorb the magnetic debris on the conveying chain 210 between the second magnetic member 320 and the driving sprocket 220.

[0057] It should be noted that when the conveying chain 210 is arranged in the track and friction is generated between the conveying chain 210 and the track, the third magnetic member 330 and the fourth magnetic member 340 can adsorb the magnetic debris generated by the above friction.

[0058] The number of the third magnetic member 330 and the fourth magnetic member 340 can be one or multiple arranged at intervals. One third magnetic member 330 is arranged near the position where the conveying chain 210 enters the driven sprocket 230, and one fourth magnetic member 340 is arranged near the position where the conveying chain 210 enters the driving sprocket 220.

[0059] In some embodiments, the plurality of magnetic members includes a fifth magnetic member and a sixth magnetic member. At least a portion of the meshing region between the conveying chain and the driving sprocket is within the magnetic field range of the fifth magnetic member, and at least a portion of the meshing region between the conveying chain and the driven sprocket is within the magnetic field range of the sixth magnetic member. The meshing region between the conveying chain and the driving sprocket is the portion of the conveying chain that contacts the driving sprocket, and the fifth magnetic member can attract magnetic debris on the portion of the conveying chain. The meshing region between the conveying chain and the driven sprocket is the portion of the conveying chain that contacts the driven sprocket, and the sixth magnetic member can attract magnetic debris on the portion of the conveying chain.

[0060] It should be understood that the debris generated during the conveying of the conveying chain is mainly generated by the driving sprocket and the driven sprocket. By arranging the fifth magnetic member and the sixth magnetic member at the above positions, the generated debris can be directly attracted, thereby further reducing the drift of the debris.

[0061] In some embodiments, in the conveying plane of the conveying chain 210, the second magnetic member 320 and each fourth magnetic member 340 are arranged in a staggered manner with the first magnetic member 310 and arranged in a staggered manner with each third magnetic member 330 along a direction perpendicular to the conveying direction of the conveying chain 210. In this way, the magnetized chain, the driving sprocket 220, and the driven sprocket 230 do not affect other components of the oven.

[0062] Each set of conveying devices 200 is arranged with the oven body 100 and located at the top of the baking cavity. The magnetic debris of the conveying chain 210 directly enters the oven along with the conveying chain 210. In order to improve the stability of the conveyed products 10, in some embodiments, at least two sets of conveying devices 200 are arranged side by side and in parallel. The products 10 are conveyed by the clamping rods on the at least two sets of conveying devices 200, and the clamping rods are not easy to deflect, so that the products 10 on the clamping rods are also not easy to deflect and interfere with each other.

[0063] In some embodiments, the driving sprocket 220 of each set of conveying devices can be connected through a transmission shaft, and a driving member drives the transmission shaft to rotate, thereby driving the plurality of sets of conveying devices. In this way, the moving speed of each set of conveying devices is the same, and the cost is lower.

[0064] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A circuit board oven, characterized in that, The circuit board oven includes: The oven body has a baking cavity; A conveying device is used to transport products through the baking cavity. The conveying device includes a conveyor chain, a drive sprocket, and a driven sprocket. The conveyor chain drives the drive sprocket and the driven sprocket. The material of the conveyor chain is a ferromagnetic material. A magnetic attractor is used to generate a magnetic field to attract magnetic debris, and at least a portion of the conveyor chain is within the range of the magnetic field.

2. The circuit board oven according to claim 1, characterized in that, The magnetic attractor is an electromagnet.

3. The circuit board oven according to claim 2, characterized in that, The circuit board oven includes a switching element and a power supply assembly. The power supply assembly is electrically connected to the electromagnet, and the switching element is connected between the power supply assembly and the electromagnet to turn the magnetic field on or off.

4. The circuit board oven according to claim 3, characterized in that, The power supply component is an adjustable current power supply, which is used to adjust the magnetic field strength.

5. The circuit board oven according to claim 1, characterized in that, The magnetic accumulator is a permanent magnet.

6. The circuit board oven according to claim 1, characterized in that, The magnetic suction element is located inside the conveyor chain, and along the height direction of the box, the projection of the magnetic suction element at least partially overlaps with the projection of the conveyor chain.

7. The circuit board oven according to any one of claims 1-6, characterized in that, The magnetic attraction element is provided in at least two parts, one of which is a first magnetic attraction element and the other is a second magnetic attraction element; The area where the conveyor chain separates from the driving sprocket is within the magnetic field range of the first magnetic attractor, and the area where the conveyor chain separates from the driven sprocket is within the magnetic field range of the second magnetic attractor.

8. The circuit board oven according to claim 7, characterized in that, Of the plurality of magnetic components, at least one is a third magnetic component, and at least another is a fourth magnetic component; Along the direction of movement of the conveyor chain, each of the third magnetic suction components is disposed between the first magnetic suction component and the driven sprocket, and each of the fourth magnetic suction components is disposed between the second magnetic suction component and the driving sprocket.

9. The circuit board oven according to claim 8, characterized in that, The second magnetic attractor and each of the fourth magnetic attractors are offset from the first magnetic attractor in the height direction of the box, and the second magnetic attractor and each of the fourth magnetic attractors are offset from each of the third magnetic attractors in the height direction of the box.

10. The circuit board oven according to claim 7, characterized in that, Of the plurality of magnetic components, at least one magnetic component is a fifth magnetic component, and at least one magnetic component is a sixth magnetic component; At least a portion of the area where the conveyor chain meshes with the driving sprocket is within the magnetic field range of the fifth magnetic attractor, and at least a portion of the area where the conveyor chain meshes with the driven sprocket is within the magnetic field range of the sixth magnetic attractor.

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