Hot air cold riveting device

Abstract

The application discloses a hot air cold riveting device for riveting a metal sheet on a plastic shell, which comprises a clamp for clamping the plastic shell, a turnover mechanism for turning over the plastic shell to a turned-up state so that the plastic column on the turnover mechanism is easy to process, a base on which the clamp and the turnover mechanism are fixed, a slide rail extending in an axial direction at the bottom of the base so that the base can drive the clamp and the turnover mechanism to displace in the axial direction, a hot air gun arranged at one end of the base and capable of blowing hot air so that the plastic column on the plastic shell is softened by heat, and a cold riveting mechanism arranged at the other end of the base and comprising a pneumatic cylinder and a pressing head, the pneumatic cylinder being capable of driving the pressing head to extrude and deform the plastic column on the plastic shell so that the metal sheet is riveted on the plastic shell. The application can realize high assembly automation and significantly improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of automated assembly and processing technology for electronic products, specifically a hot air cold riveting device. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] For the assembly of plastic parts, adhesive bonding, solvent bonding, or fastener bonding are commonly used. Adhesive bonding refers to using the adhesion and cohesion of adhesives to bond the surfaces of plastic parts together. However, adhesives have low peel strength, poor resistance to damp heat and impact, and organic adhesives are flammable and toxic. Solvent bonding generally involves using solvents to dissolve the surface of plastic parts, mixing the materials, and then forming a joint after the solvent evaporates. Solvent bonding also has low strength and is more expensive. Fastener bonding uses mechanical components such as press-fit fasteners, self-tapping screws, or bolts to fix plastic parts together. The disadvantages of fastener bonding are that it requires additional parts and tools, increasing weight and cost. In addition, fasteners may damage the structure and performance of plastic parts. This method is even more difficult to adopt in the field of precision electronic product assembly, which is the subject of this invention.

[0004] There is also a method for hot air cold riveting of plastic parts, which involves hot melting the plastic and then cold pressing it to fix it. However, the structure of hot air cold riveting equipment is often too complex and the cost is high. At the same time, there is a lot of manual intervention, resulting in low standardization and automation. The adaptation effect for parts of precision electronic products is not ideal, and the production speed is slow.

[0005] Therefore, there is currently no hot air cold riveting device that can solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a highly efficient and automated hot air cold riveting device with a high degree of automation, which can significantly improve production efficiency.

[0007] To achieve the above objectives, the present invention discloses a hot air cold riveting device for riveting a metal sheet to a plastic shell, wherein the plastic shell has plastic posts, and the metal sheet includes through holes so that the metal sheet can be fitted onto the plastic shell; comprising:

[0008] A clamp for holding the plastic shell;

[0009] A flipping mechanism includes a flipping shaft, a gear, a rack, a slide groove, and a cylinder. The flipping shaft extends radially and is fixed to the bottom side of the clamp. The gear is sleeved and fixed to one end of the flipping shaft and meshes with the rack. The slide groove extends axially, and the rack can be displaced along the slide groove under the drive of the cylinder, so that the gear can drive the clamp to flip around the radial direction.

[0010] A base, the clamp and the flipping mechanism are fixed on the base, and the bottom of the base includes a slide rail extending along the axial direction, so that the base can drive the clamp and the flipping mechanism to move along the axial direction;

[0011] A hot air gun is disposed at one end of the base and can blow hot air to melt and soften the plastic pillars on the plastic shell.

[0012] A cold riveting mechanism is provided at the other end of the base. The cold riveting mechanism includes a pneumatic cylinder and an extrusion head. After the plastic column is softened by the hot air gun, the pneumatic cylinder can drive the extrusion head to extrude and deform the plastic column on the plastic shell, so that the metal sheet is riveted to the plastic shell.

[0013] Furthermore, the pneumatic cylinder can drive the extrusion head to move radially, and the end of the extrusion head that contacts the plastic column includes an arc-shaped inner groove.

[0014] Furthermore, the pneumatic cylinder can drive the extrusion head to move radially, and the end of the extrusion head that contacts the plastic column includes an arc-shaped inner groove.

[0015] Furthermore, the flipping mechanism can drive the clamp to flip 90° so that the plastic column can be flipped to a position parallel to the displacement direction of the extrusion head.

[0016] Furthermore, the number and position of the hot air gun are matched with those of the plastic columns.

[0017] Furthermore, the outlet temperature of the hot air gun is 280-290℃.

[0018] Furthermore, the hot air gun is fixed on the frame and includes multiple sets of hot air cold riveting devices arranged in parallel, with the multiple sets of hot air cold riveting devices sharing the same frame.

[0019] Furthermore, the base also includes a positioning plate that matches one side of the clamp so that the clamp can be positioned by the positioning plate if it falls over.

[0020] This invention also discloses a hot air cold riveting method, which includes the following steps:

[0021] The plastic shell is fixed to the clamp, which is placed in the positioning plate;

[0022] The flipping mechanism drives the clamp to flip and stand up;

[0023] The base drives the clamp, which has been flipped and stood up, to move to the position of the hot air gun, and drives the hot air gun to heat the plastic column on the plastic shell with hot air until the plastic column softens to the preset requirement.

[0024] The base moves the clamp to the position of the cold riveting mechanism and drives the extrusion head to rivet the plastic column until the plastic column is deformed and the metal sheet is completely fixed on the plastic shell.

[0025] The flipping mechanism causes the clamp to flip back, the base falls into the positioning plate, and then the base causes the clamp to return to its initial position.

[0026] By employing the above technical solutions, the beneficial effects of the present invention are as follows:

[0027] 1. The hot air cold riveting device of the present invention, through the base and the rotating clamp of the flipping mechanism, flips and moves between the hot air gun used for hot melting and softening the plastic column and the cold riveting mechanism used for riveting the softened plastic column at a specific time node, realizing a high degree of automation and significantly improving installation efficiency compared with manual assembly.

[0028] 2. The hot air cold riveting device of the present invention has a high degree of standardization. Multiple sets of hot air cold riveting devices can be arranged side by side as needed, and multiple sets of hot air guns can be fixed together using the same frame. At the same time, the number and position of the hot air guns can also be flexibly arranged according to the characteristics of the plastic structure to be hot-melted.

[0029] 3. The hot air cold riveting device of the present invention has high assembly and production precision. The entire production line includes only two displacement mechanisms: one is a base that moves back and forth along the axial direction, and the other is a flipping mechanism that flips around the radial direction. The movement path is straight, and positioning and calibration can be performed by a positioning plate before and after flipping, thus achieving high precision. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an isometric view of a hot air cold riveting device provided in the embodiments of this specification;

[0032] Figure 2 This is a schematic diagram of an electronic component to be processed, provided in the embodiments of this specification;

[0033] Figure 3 This is a schematic diagram of the cold riveting mechanism of a hot air cold riveting device provided in the embodiments of this specification;

[0034] Figure 4 This is a partial detailed view of point A of a hot air cold riveting device provided in the embodiments of this specification;

[0035] In the diagram: 001, metal sheet; 002, plastic shell; 003, plastic column; 1, clamp; 2, flipping mechanism; 21, rotating shaft; 22, gear; 23, rack; 24, slide groove; 25, cylinder; 3, base; 31, slide rail; 4, cold riveting mechanism; 41, pneumatic cylinder; 42, extrusion head; 5, hot air gun; 6, frame; 7, positioning plate. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0037] In the description of this invention, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0038] like Figures 1 to 4 The diagram illustrates a hot air cold riveting device of the present invention, used to rivet a metal sheet 001 onto a plastic shell 002. The plastic shell has plastic posts 003, and the metal sheet 001 includes a through hole, allowing the metal sheet 001 to be fitted onto the plastic shell 002. The device includes:

[0039] Clamp 1, clamp 1 is used to clamp plastic shell 002;

[0040] The flipping mechanism 2 includes a flipping shaft 21, a gear 22, a rack 23, a slide groove 24, and a cylinder 25. The flipping shaft 21 extends radially and is fixed to the bottom side of the clamp 1. The gear 22 is sleeved and fixed to one end of the flipping shaft 21 and meshes with the rack 23. The slide groove 24 extends axially, and the rack 23 can be displaced along the slide groove 24 under the drive of the cylinder 25, so that the gear 22 can drive the clamp 1 to flip radially.

[0041] The base 3, clamp 1 and flipping mechanism 2 are fixed on the base 3. The bottom of the base 3 includes a slide rail 31 extending axially, so that the base 3 can drive the clamp 1 and flipping mechanism 2 to move axially.

[0042] Hot air gun 5 is set at one end of the base 3. The hot air gun 5 can blow hot air so that the plastic column 003 on the plastic shell 002 is melted and softened by heat.

[0043] The cold riveting mechanism 4 is located at the other end of the base 3. The cold riveting mechanism 4 includes a pneumatic cylinder 41 and an extrusion head 42. After the plastic column 003 is softened by the hot air gun 5, the pneumatic cylinder 41 can drive the extrusion head 42 to extrude and deform the plastic column 003 on the plastic shell 002 so that the metal sheet 001 is riveted to the plastic shell 002.

[0044] With the above structure, when the hot air cold riveting device of the present invention is working, the operator only needs to put the metal sheet 001 to be processed onto the plastic post 003 on the plastic shell 002 and fix the main body of the plastic shell 002 tightly with the clamp 1 to start the automatic operation of the device. After receiving the start signal, the cylinder 25 in the flipping mechanism 2 first drives the rack 23 to slide along the slide groove 24, so that the gear 22 meshing with the rack 23 rotates. Then the gear 22 drives the rotating shaft 21 to rotate. Since the rotating shaft 21 is fixedly installed on one side of the clamp 1, the clamp 1 can rotate accordingly, so that the plastic column 003 on the clamp 1 stands up. At the same time, the base 3 moves along the slide rail 31 under the drive of external force until the position of the plastic column 003 reaches the position corresponding to the working area of ​​the hot air gun 5. The hot air gun 5 can then heat melt and soften the plastic column 003. Then, the base 3 continues to move, which can drive the clamp 1 to move to the working position of the cold riveting mechanism 4. After reaching the corresponding position, the pneumatic cylinder 41 in the cold riveting mechanism 4 drives the extrusion head 42 to press down. The extrusion head 42 extrudes the softened plastic column 003, deforming the plastic column 003 and completing the riveting of the metal sheet 001. Throughout the entire process, at specific time points, the hot air gun 5 used for hot melting and softening the plastic column 003 and the cold riveting mechanism 4 used for riveting the softened plastic column 003 are flipped and moved, avoiding manual access and achieving a high degree of automation. At the same time, the entire production line only includes two displacement mechanisms: one is the base 3 that moves back and forth along the axial direction, and the other is the flipping mechanism 2 that flips around the radial direction. The structure is simple and has a high degree of standardization.

[0045] Furthermore, such as Figure 2 and Figure 3 As shown, the plastic shell 002 to be processed in this invention includes multiple plastic pillars 003. Therefore, the cold riveting mechanism 4 also needs extrusion heads 42 corresponding to the multiple plastic pillars 003, and the size of the extrusion head 42 is slightly larger than the diameter of the plastic pillars 003. Figure 4 As shown, the gear 22 in the flipping mechanism 2 is fixed to the rotating shaft 21 by a metal key structure, which is simple in structure and convenient to assemble and maintain. The length of the rack 23 is sufficient to allow the gear 22 to complete half a full rotation, and the width of the rack 23 matches the thickness of the gear 22, so that the gear 22 and the rack 23 have a good fit. The cylinder 25 has a preset stroke distance, which can stably drive the rack 23 to slide back and forth in the slide groove 24 with high precision. The back and forth stroke distance of the slide rail 31 of the base 3 is greater than the distance between the cold riveting mechanism 4 and the hot air gun 5. The main excess stroke is located upstream of the hot air gun 5, so that the flipping mechanism 2 has enough space to flip the clamp 1 to the required angle before the hot air gun 5.

[0046] Furthermore, such as Figure 3As shown, the pneumatic cylinder 41 can drive the extrusion head 42 to move radially, and the end of the extrusion head 42 that contacts the plastic column 003 includes an arc-shaped inner groove. Specifically, during operation, the extrusion head 42 presses against the molten plastic column 003. Due to the presence of the inner groove, the plastic column 003 can be extruded into a hemispherical shape similar to the inner groove, completely covering the through hole of the metal piece 001 at the riveting joint, thereby obtaining better riveting stability.

[0047] Furthermore, the flipping mechanism 2 can drive the fixture 1 to flip 90°, so that the plastic column 003 can be flipped to a position parallel to the displacement direction of the extrusion head 42. Specifically, in order to protect the plastic column 003 while maintaining the balance of the workpiece to be processed and making it easier to transport, the plastic shell 002 is initially in a flat state, which is also the end state of the previous processing. It needs to be flipped before the hot air cold riveting process can be performed. Therefore, after the fixture 1 clamps the plastic shell 002, during the flipping process, the rotating shaft 21 rotates half a turn, driving the plastic shell 002 to flip 90°, so that the plastic column 003 on the plastic shell 002 can be fully erected, so that the plastic column 003 is in a more easily processed state.

[0048] Furthermore, the number and position of the hot air guns 5 are matched with those of the plastic pillars 003. Specifically, in this embodiment, the plastic shell 002 includes a total of four plastic pillars 003, that is, it includes four hot air guns 5 that correspond one-to-one with the positions of the plastic pillars 003, and all the hot air guns 5 are equidistant from the plastic pillars 003 to be melted, so that the plastic pillars 003 can obtain a uniform melting effect, and the outlet temperature of the hot air guns 5 is 280-290℃, which can obtain a more suitable plastic softening effect, facilitating the rapid riveting deformation of the plastic pillars 003 in subsequent steps.

[0049] Furthermore, such as Figure 1 As shown, the hot air gun 4 is fixed on the frame 6, which includes multiple sets of parallel hot air riveting devices, all sharing the same frame 6. Specifically, this embodiment requires the simultaneous processing of six sets of parts to achieve the required processing speed. Therefore, by arranging multiple hot air riveting devices in parallel, unified processing management can be achieved. Simultaneously, by having multiple hot air riveting devices share the same frame 6, the assembly cost of this embodiment can be effectively reduced. This is also determined by the structural features of the hot air riveting device of this invention; the hot air riveting device of this invention has regular plate-like sides, making it easier to assemble multiple devices together for use.

[0050] Furthermore, such as Figure 4As shown, the base also includes a positioning disk 7, which matches one side of the clamp 1 so that the tilted clamp 1 can be positioned by the positioning disk 7. Specifically, the inner groove of the positioning disk 7 matches the outer contour of one side of the clamp 1, and the position of the positioning disk 7 can be calibrated and adjusted for precision between each use. Therefore, by setting the positioning disk 7, the deviation caused by the tilting mechanism 2 during the tilting process is reduced, and the processing accuracy of this device is improved.

[0051] like Figure 1-4 As shown, an operational embodiment of a hot air cold riveting method is also included, comprising the following steps:

[0052] Fix the plastic shell 002 onto the clamp 1, and place the clamp 1 in the positioning plate 7;

[0053] The flipping mechanism 2 drives the clamp 1 to flip and stand up;

[0054] The base 3 drives the clamp 1, which has been flipped and erected, to move to the position of the hot air gun 5, and drives the hot air gun 5 to heat the plastic column 003 on the plastic shell 002 with hot air until the plastic column 003 softens to the preset requirement.

[0055] The base 3 drives the clamp 1 to move to the position of the cold riveting mechanism 4, and drives the extrusion head 42 to rivet the plastic column 003 until the plastic column 003 is deformed and the metal sheet 001 is completely fixed on the plastic shell 002.

[0056] The flipping mechanism 2 drives the clamp 1 to flip back, the base 3 falls into the positioning plate 7, and then the base 3 drives the clamp 1 to return to the initial position.

[0057] The hot air cold riveting method described above avoids manual intervention during operation, achieving a high degree of automation. In this embodiment, there are only two steps in operation: axial movement and flipping. At the same time, the positioning and correction of the fixture 1 by the positioning plate 7 enables this embodiment to achieve high processing accuracy and high output efficiency.

[0058] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hot air cold riveting device for riveting metal sheets onto a plastic shell, wherein, The plastic shell has plastic pillars, and the metal sheet includes through holes so that the metal sheet can be fitted onto the plastic shell; characterized in that it includes: A clamp for holding the plastic shell; A flipping mechanism includes a flipping shaft, a gear, a rack, a slide groove, and a cylinder. The flipping shaft extends radially and is fixed to the bottom side of the clamp. The gear is sleeved and fixed to one end of the flipping shaft and meshes with the rack. The slide groove extends axially, and the rack can be displaced along the slide groove under the drive of the cylinder, so that the gear can drive the clamp to flip around the radial direction. A base, the clamp and the flipping mechanism are fixed on the base, and the bottom of the base includes a slide rail extending along the axial direction, so that the base can drive the clamp and the flipping mechanism to move along the axial direction; A hot air gun is disposed at one end of the base and can blow hot air to melt and soften the plastic pillars on the plastic shell. A cold riveting mechanism is provided at the other end of the base. The cold riveting mechanism includes a pneumatic cylinder and an extrusion head. After the plastic column is softened by the hot air gun, the pneumatic cylinder can drive the extrusion head to extrude and deform the plastic column on the plastic shell, so that the metal sheet is riveted to the plastic shell.

2. The hot air cold riveting device according to claim 1, characterized in that: The pneumatic cylinder can drive the extrusion head to move radially, and the end of the extrusion head that contacts the plastic column includes an arc-shaped inner groove.

3. The hot air cold riveting device according to claim 2, characterized in that: The flipping mechanism can drive the clamp to flip 90° so that the plastic column can be flipped to be parallel to the displacement direction of the extrusion head.

4. The hot air cold riveting device according to claim 1, characterized in that: The number and position of the hot air gun are matched with those of the plastic columns.

5. The hot air cold riveting device according to claim 1, characterized in that: The outlet temperature of the hot air gun is 280-290℃.

6. The hot air cold riveting device according to claim 1, characterized in that: The hot air gun is fixed on the frame and includes multiple sets of hot air cold riveting devices arranged in parallel, with the multiple sets of hot air cold riveting devices sharing the same frame.

7. The hot air cold riveting device according to claim 1, characterized in that: The base also includes a positioning plate that matches one side of the clamp so that the clamp can be positioned by the positioning plate if it falls over.

8. A hot air cold riveting method, used in the hot air cold riveting apparatus of claim 1, characterized in that, Includes the following steps: The plastic shell is fixed to the clamp, which is placed in the positioning plate; The flipping mechanism drives the clamp to flip and stand up; The base drives the clamp, which has been flipped and stood up, to move to the position of the hot air gun, and drives the hot air gun to heat the plastic column on the plastic shell with hot air until the plastic column softens to the preset requirement. The base moves the clamp to the position of the cold riveting mechanism and drives the extrusion head to rivet the plastic column until the plastic column is deformed and the metal sheet is completely fixed on the plastic shell. The flipping mechanism causes the clamp to flip back, the base falls into the positioning plate, and then the base causes the clamp to return to its initial position.

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