Induction coil for synchronously heating multiple injection molding copper nuts

Abstract

The utility model discloses an induction coil for synchronously heating a plurality of injection-molded copper nuts, which relates to the technical field of hot pressing and comprises a loop structure which is formed by winding the same section of metal piece and has one closed end and one open end. Wherein the closed end is provided with a plurality of accommodating holes for accommodating copper nuts, the accommodating holes are communicated with one another, and the open end is connected with an induction heating power supply through a flexible cable. The induction coil provided by the utility model can realize synchronous heating of a plurality of injection molding copper nuts, and has the effects of improving the production efficiency and the automation rate of embedding the injection molding copper nuts and having very strong market applicability based on the high efficiency of induction heating.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot pressing technical field more specifically, it relates to a kind of induction coil for the synchronous heating of multiple injection molding copper nut. BACKGROUND

[0002] In the injection molding industry, the method of embedding metal parts for fixing on the plastic body is a very widely used process. The most common method is to embed copper nuts on plastic parts. Copper nuts are often chosen as embedded parts due to their good electrical conductivity and mechanical properties to enhance the structural strength and connection reliability of plastic parts. Figure 1 As shown in the electromagnetic valve injection molding part 100 product, five copper nuts 200 need to be embedded to meet the assembly and use requirements, wherein Figure 1 The left side is a schematic diagram of the state before embedding copper nuts in plastic parts, and the right side is a schematic diagram of the state after embedding copper nuts in plastic parts.

[0003] Currently, there are four common embedding processes: hot-press embedding, ultrasonic embedding, nut pre-embedded injection molding and cold-press embedding. Among them, hot-press embedding technology is the most commonly used method due to its easy automation control and relatively low cost; this technology usually involves two core steps of preheating and pressing in copper nuts. By heating, the temperature of the copper nut is higher than the melting point of the plastic part, so that the surrounding plastic melts as soon as the copper nut contacts the plastic part. After the copper nut is pressed in, the plastic solidifies and perfectly matches the pattern on the copper nut, achieving firm mechanical engagement.

[0004] Two common hot-press implementation methods in industry: one is to use a mechanical hand or a numerical control mechanism to drive an embedding head to embed copper nuts one by one, and to arrange a heating device on the path of copper nut conveying to the embedding head; the second is to customize a heating table according to the characteristics of the product, and to place the copper nuts on the heating table for a certain period of time by manual or mechanical means, and then press them into the embedding position at once. Among them, the first method has high flexibility and can adapt to the embedding needs of different workpieces, but the sequential embedding method limits the production efficiency, especially when embedding multiple copper nuts in the same part, the low efficiency of this method will be more obvious. The second method can realize batch heating of copper nuts, but due to the open space of the heating table and the limited heat conduction efficiency, in order to ensure that the copper nut reaches the ideal embedding temperature, the heating table needs to be maintained at a high temperature state, resulting in energy waste.

[0005] In view of the above, an innovative heating device is needed to overcome the shortcomings of the existing technology. INVENTION CONTENTS

[0006] In view of this problem in actual application, the utility model discloses a kind of induction coil for multiple injection molding copper nut synchronous heating, realize the efficient heating of multiple copper nut and inlay simultaneously, both improve production efficiency, can effectively reduce energy consumption, specific scheme is as follows:

[0007] A kind of induction coil for multiple injection molding copper nut synchronous heating, the induction coil is by the same piece of metal winding and is closed at one end, open loop structure at one end;

[0008] Wherein, closed end has several containing holes for accommodating copper nut, each containing hole is interconnected, and open end is connected by flexible cable induction heating power supply.

[0009] Further, several containing holes are evenly arranged at closed end along the axis direction perpendicular to induction coil, and the positional relationship of each containing hole corresponds to the positional relationship of each copper nut on injection molding part.

[0010] Further, fixed hole is formed on the side of each containing hole on open end.

[0011] Further, the inner diameter of containing hole is greater than the maximum outer diameter of copper nut.

[0012] Further, the top end of flexible cable is provided with coil clamp jaw, the coil clamp jaw fixes induction coil open end, and makes induction coil perpendicular to flexible cable arrangement.

[0013] Further, the outer periphery of flexible cable is provided with cable support.

[0014] Further, several mounting holes are also formed on the induction coil close to open end.

[0015] Compared with prior art, the utility model has the beneficial effects as follows:

[0016] In the utility model, an induction coil is given, and the synchronous heating of multiple injection molding copper nuts can be realized using the induction coil, and based on the high efficiency of induction heating, the production efficiency and automation rate of copper nut inlay of injection molding part are improved, and the utility model has strong market applicability. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic view of copper nut inlay before and after inlay for injection molding part product in prior art;

[0018] Figure 2 It is the overall structure schematic view of induction coil in the embodiment 1 of the utility model;

[0019] Figure 3 It is the state schematic view when copper nut is built-in in the induction coil in the embodiment 1 of the utility model.

[0020] Figure 4 This is a side view of the induction coil connected to components such as flexible cables in Embodiment 1 of this utility model;

[0021] Figure 5 This is an overall structural diagram of the induction coil connected to flexible cables and other components in Embodiment 1 of this utility model;

[0022] Figure 6 This is a schematic diagram of the usage scenario in Embodiment 2 of this utility model.

[0023] Figure label:

[0024] 1. Coil base; 11. Clamping part; 12. Mounting hole; 2. Coil body; 21. Receiving hole; 22. Fixing hole; 3. Flexible cable; 31. Cable support; 32. Connecting hole; 4. Coil gripper; 41. Base plate; 42. L-shaped clamping plate; 43. Locking bolt;

[0025] 5. Mounting base; 51. Upper base; 52. Lower base; 6. Working slide; 7. Feeding mechanism; 8. Heating mechanism; 9. Embedding mechanism; 91. Lifting rod;

[0026] 100. Injection molded parts; 200. Copper nuts. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] like Figure 2 As shown, this embodiment addresses the hot pressing process of copper nuts in injection-molded solenoid valve coils, providing an induction coil for simultaneous heating of multiple injection-molded copper nuts. The induction coil is a loop structure with one end closed and the other open, formed by winding a single metal component, such as copper. For ease of description, the induction coil is defined as two parts: a coil base 1 and a coil body 2. The coil base 1 is the part of the loop structure closer to the open end, and the coil body 2 is the part of the loop structure closer to the closed end.

[0030] Since the injection-molded part of the solenoid valve needs to be inlaid with five copper nuts, five receiving holes 21 for accommodating the copper nuts are opened on the coil body 2 (i.e., the closed end). Each receiving hole 21 is interconnected and is evenly arranged on the coil body 2 along the axis perpendicular to the induction coil. Each receiving hole 21 can hold one copper nut. Preferably, the inner diameter of the receiving hole 21 is larger than the maximum outer diameter of the copper nut.

[0031] As Figure 3 The actual use is shown in the state of five copper nuts 200 placed in each accommodating hole 21 of the induction coil, and the copper nut 200 is in the state of waiting for subsequent induction heating and inlaying process. Since the induction coil is a whole loop structure, and the induction coil is uniformly distributed around each copper nut 200, when the induction coil is powered on, all copper nuts 200 can be synchronously induction heated, which helps to improve the heating efficiency.

[0032] Due to the high efficiency of induction heating, it usually only takes 2-3 seconds to heat the copper nut 200 to the inlaying temperature. The traditional heating table heats the copper nut 200 from the inside out by the heating column inserted into the nut. Based on the principle of induction heating, the outer surface of the copper nut 200 is heated first, and the outer surface of the copper nut 200 is the target area that needs to be heated in the thermal inlaying process. Therefore, induction heating can directly heat the target area, further improving the heating efficiency of the copper nut 200.

[0033] In addition, it should be noted that according to the actual product of the to-be-injection-molded part 100, the structure, number, and arrangement of the coil body 2 and the accommodating holes 21 thereon can be flexibly designed to meet different needs in actual use. For example, when the number of copper nuts 200 to be inlaid on the to-be-injection-molded part 100 is four, the number of accommodating holes 21 is also correspondingly four, and the accommodating holes 21 are uniformly arranged on the coil body 2 according to the position of the copper nut 200 to be inlaid on the injection-molded part 100. The embodiment only gives one implementation, which cannot be regarded as a limitation of the present application. As long as the induction coil can be uniformly distributed around each copper nut 200, it can be regarded as within the scope of the present application.

[0034] Combining Figures 4-5 As shown, the coil base 1 (i.e. the open end) is connected to the induction heating power supply through the flexible cable 3 to realize the induction heating of the coil body 2. Similarly, the structure of the coil base 1 can also be adaptively changed according to the actual use demand to meet the installation demand. In the embodiment, the coil base 1 is a general structure, specifically a block structure, which is used to play the role of heat conduction and connection fixation.

[0035] In addition, in order to realize the installation and fixation of the whole induction coil, the coil base 1 is also combined with Figures 4-5 In the embodiment,

[0036] A fixing hole 22 is provided beside each accommodating hole 21 on the coil body 2, and the purpose of providing the fixing hole 22 is to cooperate with the bolt to fix the coil body 2.

[0037] The top end of the flexible cable 3 is provided with a coil clamping jaw 4, and the coil clamping jaw 4 fixes the coil base 1. Specifically, in one possible embodiment, the coil base 1 is provided with a clamping portion 11 on each side near the end portion, the coil clamping jaw 4 includes a bottom plate 41 and L-shaped clamping plates 42 located at both ends of the bottom plate 41, the two L-shaped clamping plates 42 are respectively provided with clamping through grooves (not shown in the figure) matched in height with the clamping portions 11 and the coil clamping jaw 4 is further provided with locking bolts 43. During installation, the clamping portions 11 at both ends of the coil base 1 are placed in the clamping through grooves, and the locking bolts 43 are used for fixation, so as to realize the locking and fixation of the coil clamping jaw 4 to the end portion of the coil base 1. Preferably, the fixed coil base 1 is arranged perpendicularly to the flexible cable 3 to adapt to the subsequent installation of tooling fixtures.

[0038] The two side walls in the axial direction of the coil base 1 are further provided with a plurality of mounting holes 12. The mounting holes 12 are arranged to cooperate with bolts to fix the side walls of the coil base 1.

[0039] The outer periphery of the flexible cable 3 is provided with cable supports 31, and preferably two cable supports 31 are arranged in the axial direction of the flexible cable 3. The cable supports 31 are provided with a plurality of connecting holes 32. The connecting holes 32 are arranged to cooperate with bolts to fix the flexible cable 3.

[0040] Embodiment 2

[0041] This embodiment shows one of the use scenarios of the induction coil and the components connected thereto cooperating with other components, which can realize high-speed inlaying work.

[0042] As shown in Figure 6 , the use scenario includes a mounting base 5, a working sliding table 6, a feeding mechanism 7, a heating mechanism 8 and an inlaying mechanism 9. The mounting base 5 is composed of an upper base 51 and a lower base 52, and the working sliding table 6 is slidably connected to the top surface of the lower base 52. The feeding mechanism 7 is installed on the upper base 51 and the grabbing end thereof faces the top surface of the lower base 52. The heating mechanism 8 (i.e. the induction coil and the components connected thereto in the embodiment 1, which are collectively referred to as the heating mechanism 8 herein for convenience of description) is fixed on the working sliding table 6. The inlaying mechanism 9 is located below the lower base 52 and is fixed on the lower base 52. The inlaying mechanism 9 is further provided with jacking rods 91 corresponding in position to the installation positions of the five copper nuts 200 on the electromagnetic valve injection molded part 100 product. The working sliding table 6 is provided with through holes (not shown in the figure) corresponding in position to the jacking rods 91, so that the jacking rods 91 can jack up the five copper nuts 200 placed on the working sliding table 6.

[0043] More specifically, in the heating mechanism 8, the coil body 2 is fixed to the working slide 6 through the fixing hole 22 and the screw; the coil base 1 is fixed to the working slide 6 through the mounting hole 12 and the connecting assembly; and the cable support 31 is fixed to the working slide 6 through the connecting hole 32 and the screw. When the working slide 6 moves, the heating mechanism 8 moves accordingly.

[0044] It should be noted that the various mechanisms included in this use scenario, except for the heating mechanism 8, are not within the protection scope of the present application, and the working slide 6, the feeding mechanism 7, and the inlaying mechanism 9 are prior art, for example, the working slide 6 can be driven by a hydraulic cylinder to realize its sliding on the lower base 52, the feeding mechanism 7 can adopt a special mechanical hand suitable for nut grabbing, and the jacking action of the jacking rod 91 on the inlaying mechanism 9 can also be realized by a hydraulic cylinder, and the specific structure and working principle of these mechanisms will not be described here.

[0045] The implementation process of this use scenario is as follows: first, fix the injection molded part 100 product at a predetermined position, and fix the induction coil at a predetermined position of the working slide 6; then, move the working slide 6 to below the feeding mechanism 7, and simultaneously feed all the copper nuts 200 to the inlaying position, i.e., the accommodation holes 21 of the induction coil, by the feeding mechanism 7, with the working slide 6 as the support; then, translate the working slide 6 from below the feeding mechanism 7 to above the inlaying mechanism 9, and in the feeding process, the induction coil can be powered to inductively heat the copper nuts 200, and after the copper nuts 200 are heated, the jacking rod 91 of the inlaying mechanism 9 jacks up to press the copper nuts 200 into the injection molded part 100 at one time, thereby completing the hot pressing of the copper nuts 200.

[0046] In this implementation process, since the heating mechanism 8 is relatively fixed with the working slide 6, the induction coil is arranged at the inlaying position, and therefore, heating can be started as soon as the feeding is completed.

[0047] Moreover, since the induction coil can inductively heat the five copper nuts 200 at the same time, the heating efficiency is very high, and through reasonable process arrangement and structural design of the tooling fixture, very efficient inlaying operation can be realized, and the production efficiency is greatly improved.

[0048] In addition, thanks to the high efficiency of inductive heating, the heating mechanism 8 does not need to maintain high temperature for a long time, but only needs to be powered for a few seconds before inlaying, and is in the off state at other times, so that this heating method can reduce energy consumption to a certain extent.

[0049] The above merely is preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above examples, and belongs to the technical scheme under the idea of the present application all belongs to the protection scope of the present application. It should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the present application, some improvements and decorations, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. An induction coil for synchronous heating of multiple injection-molded copper nuts, characterized in that: The induction coil is a loop structure with one end closed and the other end open, formed by winding the same piece of metal. The closed end has several receiving holes for accommodating copper nuts, and each receiving hole is interconnected. The open end is connected to an induction heating power supply via a flexible cable.

2. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, Several of the aforementioned receiving holes are evenly arranged at the closed end along a direction perpendicular to the axis of the induction coil, and the positional relationship of each receiving hole corresponds to the positional relationship of each copper nut on the injection molded part.

3. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, A fixing hole is provided on one side of each receiving hole on the open end.

4. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, The inner diameter of the receiving hole is larger than the maximum outer diameter of the copper nut.

5. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, The flexible cable has a coil clamp at its top end, which fixes the open end of the induction coil and makes the induction coil perpendicular to the flexible cable.

6. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, The flexible cable is provided with a cable support on its outer periphery.

7. The induction coil for synchronous heating of multiple injection-molded copper nuts according to claim 1, characterized in that, Several mounting holes are also provided on the induction coil near the open end.

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