Heat treatment device and product heat treatment system

Abstract

The invention discloses a heat treatment apparatus. The heat treatment apparatus includes: a heat preservation channel having an inlet and an outlet opposite in a longitudinal direction thereof and left and right sides opposite in a transverse direction thereof; and the multiple hot air guns are arranged on the left side and the right side of the heat preservation channel correspondingly, are arranged in the longitudinal direction of the heat preservation channel and are used for spraying hot air flow to the products passing through the heat preservation channel so as to conduct heat treatment on the products passing through the heat preservation channel. According to the invention, step-by-step heating and step-by-step cooling of the product can be realized, and the product is prevented from being subjected to thermal shock of shock cooling and shock heating. Besides, hot air in the heat preservation channel returns to an air inlet source, such as an air blower, of the hot air gun, the air inlet source is preheated, power consumption is reduced, meanwhile, the temperature of a non-direct heating area of a product is further reduced, selectivity of the heating area of the product is ensured in combination with a specially-made air outlet nozzle, and the damage degree of the non-heating area of the product can be reduced.

Description

Technical Field

[0001] The present invention relates to a heat treatment device and a product heat treatment system including the heat treatment device. Background Art

[0002] In the prior art, although the electrical conductivity of low-melting-point metal coatings such as tin plating and bismuth plating is not as good as that of precious metals such as gold plating and platinum plating, it also ranks among the top of most metals. Especially for tin plating, due to its low melting point, good ductility and low price, it is widely used in the soldering and crimping of electronic connectors and their mating ends such as PCBs. Among precious metals, low-cost silver plating and indium plating have better contact resistance than super-precious metals such as gold and platinum, and the price is less than 1%, so they are also widely used in connectors for high voltage and frequent wear.

[0003] With the rapid development of the adaptive crimping technology and the increasingly stringent requirements for the connection firmness of connectors in mobile applications such as vehicles, more and more crimping applications have replaced the complicated soldering. However, the accompanying problems are as follows: In order to maintain sufficient crimping retention force (pull-out force) to prevent connection loosening caused by vibration and maintain a sufficiently low contact resistance, the insertion force of crimping is bound to be too large, which mainly leads to the following three problems:

[0004] Problem (1): Difficult assembly insertion and excessive damage to the coatings at both mating ends, bringing the risk of contact resistance failure and unstable contact, which greatly affects the customer experience;

[0005] Problem (2): Insertion damage will exacerbate the growth of coating whiskers (tin whiskers, bismuth whiskers, indium whiskers), and contribute to the short circuit between adjacent terminals or PCB lines;

[0006] Problem (3): High-voltage connectors are often accompanied by frequent wear and rapid temperature rise, resulting in cracking and peeling of the coating (such as commonly used silver plating), a decrease in strength and failure.

[0007] To solve the above problems (1) and (2), the reflow tin melting technology came into being. Its principle is that the tin plating layer is melted and then recrystallized upon cooling, and an intermetallic compound is formed between the free molten tin and the base layer or the intermediate coating, resulting in increased hardness and wear resistance, smaller surface roughness, smaller friction coefficient, and smaller insertion force under the same crimping force (insertion force = friction coefficient * normal pressure). At the same time, the internal stress of the tin plating layer is released after remelting, further reducing the risk of tin whiskers. To solve the above problem (3), a specific heat treatment promotes the thermal diffusion between a metal coating such as silver and the base layer or the intermediate coating to form an intermetallic compound, eliminates the internal stress of the coating, increases the bonding force of the coating, and reduces the risk of cracking and peeling.

[0008] There are two common methods for reflow tin melting or heat treatment: electric furnace resistance wire heating hot air / infrared hot air radiation and induction heating. Hot air radiation can be divided into multi-stage heating to control the heating and cooling speeds due to the long baking time and slow process, forming 4 main temperature zones or 4-10 or more temperature zones including preheating, preheating constant temperature, melting and cooling, which can effectively avoid thermal shock of sudden cooling and heating. However, due to the uniform radiation and dissipation of hot air, hot air cannot directly selectively melt tin locally, which will cause the other plating on the terminal that does not need to be melted to be damaged by heat or even lose its proper function.

[0009] Inductive heating can achieve selectivity, small workspace occupation, short time, high speed and high efficiency, but the short time is also a disadvantage. It will cause the tin plating layer to rise from room temperature to the melting point in an instant (about 0.5 seconds) and then quickly return to room temperature. This will cause thermal shock of sudden cooling and heating, which will cause cracks in the plating and splattering tin points. What is more serious is that the working window is narrow, and the tip effect will cause the needle terminal plating to go from difficult to melt to the other extreme of burning and charring.

[0010] Existing hot air heat treatment methods cannot achieve selectivity. Currently, the hot air baking method can achieve multi-stage reflow tin melting. The most mature one is the SMT reflow soldering machine, which is mainly used for PCB board welding and PCB tin plating layer tin melting to prevent tin whiskers. However, the existing hot air heat treatment method has the following disadvantages:

[0011] (1) Low efficiency: It takes at least 7 minutes to complete a reflow tin melting process, and the material transmission speed is less than 0.5 meters per minute, which cannot meet the 5-15 meters per minute required for the electroplating layer.

[0012] (2) Quality stability control is difficult: the hot air is evenly distributed in the cavity, and there is almost no pressure on the surface of the coating. The molten tin is not easy to level, and cooling and recrystallization are prone to nodules and scabs.

[0013] (3) High energy consumption, huge equipment, large area, about 5m*2m*2m, high power heating, large working cavity, many ineffective heating areas, and great fire hazards.

[0014] (4) It is impossible to selectively melt tin or heat treat locally: Most connector terminals or PCB boards are selectively plated with tin, nickel, gold and other functional areas. Overall high-temperature baking will aggravate the aging of other coatings or deformation of non-metallic components. Some terminals that are tinned as a whole need to be partially assembled with plastic parts. The contact area must reach a certain roughness and bite and seal with the plastic, and tin melting is not suitable.

[0015] Of course, there are also simple hot air ducts that can improve efficiency and reduce energy consumption, but they are also unable to perform graded temperature control and local selective heat treatment, the hot air pressure is not high, and the quality is far inferior to the above SMT.

[0016] The existing selective heat treatment of inductors is unstable. There are two commonly used heating inductor coil structures and usage methods. One is that the material strip passes through all the coil turns axially, which can only heat the entire area. The other is that the material strip passes through the gap between two adjacent coil turns, and the height of the material strip entering is controlled, which can achieve local selective heating. However, the existing selective heat treatment of inductors has the following disadvantages:

[0017] (1) Tip discharge, low temperature in the middle, uneven heating on multiple surfaces: or the eddy current density generated at the edge is extremely high, which is easy to burn and burn the workpiece, while the middle of a single surface or the side surfaces of multiple surfaces cannot be fully heated due to the low current density.

[0018] (2) It is difficult to adjust the relative position between the workpiece and the coil, resulting in violent heat fluctuations and molten spattering: the material strip can easily touch or scratch the insulation layer of the coil, and the material strip is sometimes far away from the coil, and sometimes close to the coil. The size of the eddy current on the surface of the material strip changes, forming a new inductance, which is coupled with the original inductance at a close distance, causing the energy to increase or decrease sharply, resulting in molten spattering, and even causing the terminals to burn and blacken, or have no effect at all and not melt. Summary of the invention

[0019] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0020] According to one aspect of the present invention, a heat treatment device is provided. The heat treatment device comprises: a heat preservation channel having an inlet and an outlet opposite to each other in the longitudinal direction and left and right sides opposite to each other in the transverse direction; and a plurality of hot air guns, respectively arranged on the left and right sides of the heat preservation channel and arranged in the longitudinal direction of the heat preservation channel, for spraying hot air flow to products passing through the heat preservation channel to perform heat treatment on the products passing through the heat preservation channel.

[0021] According to an exemplary embodiment of the present invention, the temperatures of the hot air flows sprayed out by two adjacent hot air guns in the longitudinal direction of the heat preservation channel are different and the temperature difference is not greater than a predetermined value.

[0022] According to another exemplary embodiment of the present invention, the plurality of hot air guns are arranged in pairs on the left and right sides of the heat preservation channel, each pair of hot air guns are opposite in the lateral direction of the heat preservation channel, and the temperature of the hot air flow ejected by each pair of hot air guns is the same.

[0023] According to another exemplary embodiment of the present invention, the heat preservation channel has a front end and a rear end that are opposite to each other in its longitudinal direction, and the inlet and the outlet are respectively located at the front end and the rear end of the heat preservation channel; the plurality of hot air guns include M + N pairs of hot air guns, and the M + N pairs of hot air guns are numbered in sequence starting from the front end of the heat preservation channel, where M and N are respectively integers not less than 2; the temperatures of the hot air flows ejected by the first M pairs of hot air guns among the M + N pairs of hot air guns increase step by step, and the temperatures of the hot air flows ejected by the latter N pairs of hot air guns decrease step by step.

[0024] According to another exemplary embodiment of the present invention, the pressures of the hot air flows ejected by two adjacent hot air guns in the longitudinal direction of the heat preservation channel are different; and / or the flow rates of the hot air flows ejected by two adjacent hot air guns in the longitudinal direction of the heat preservation channel are different.

[0025] According to another exemplary embodiment of the present invention, the plurality of hot air guns are arranged in pairs on the left and right sides of the heat preservation channel, each pair of hot air guns is opposite to each other in the transverse direction of the heat preservation channel, and the pressures and flow rates of the hot air flows ejected by each pair of hot air guns are the same.

[0026] According to another exemplary embodiment of the present invention, the heat preservation channel has a pair of side walls that are opposite to each other in its transverse direction, and the hot air gun is mounted on the side wall of the heat preservation channel.

[0027] According to another exemplary embodiment of the present invention, the hot air gun includes a jet head, the jet head has a jet nozzle, and the jet nozzle has jet holes that allow hot air flow to be ejected; the jet head is mounted on the side wall of the heat preservation channel, and the jet nozzle is located in the heat preservation channel for ejecting hot air flow toward the product passing through the heat preservation channel.

[0028] According to another exemplary embodiment of the present invention, the hot air gun further includes a jet pipe, the jet pipe has a tapered pipe portion, the tapered pipe portion has an air outlet port, and the inner cavity of the tapered pipe portion is tapered and gradually contracts toward the air outlet port; the inlet end of the jet head is connected to the air outlet port of the jet pipe to be in gas communication with the jet pipe.

[0029] According to another exemplary embodiment of the present invention, the jet head is detachably connected to the air outlet port of the jet pipe, and the jet head is detachably mounted on the side wall of the heat preservation channel, so that the jet head of the heat treatment device can be replaced according to the product to be processed.

[0030] According to another exemplary embodiment of the present invention, the air injection pipe further has an arc-shaped elbow portion, one end of the arc-shaped elbow portion is connected to the inlet end of the conical pipe portion, and an arc-shaped air flow channel is formed inside the arc-shaped elbow portion for changing the flow direction of the hot air flow.

[0031] According to another exemplary embodiment of the present invention, the air injection pipe further has a flange portion at the other end of the arc-shaped elbow portion, so that the air injection pipe can be connected to the outlet end of the gas heater through the flange portion.

[0032] According to another exemplary embodiment of the present invention, the heat treatment device further includes: a plurality of gas heaters, which are respectively connected to the inlet ends of the plurality of hot air guns for heating the gas to be conveyed to the hot air guns, so that the gas conveyed to the hot air guns has a corresponding temperature.

[0033] According to another exemplary embodiment of the present invention, the heat treatment device further includes: a blower having an air outlet for outputting compressed gas; and a plurality of gas pipelines for respectively connecting the plurality of gas heaters to the air outlet of the blower, and the blower supplies compressed gas to the plurality of gas heaters through the plurality of gas pipelines.

[0034] According to another exemplary embodiment of the present invention, the compressed gas is preheated to a predetermined initial temperature in the blower and then heated to a corresponding temperature by the gas heater.

[0035] According to another exemplary embodiment of the present invention, the heat treatment device further includes: a plurality of pressure regulating valves respectively arranged on the plurality of gas pipelines for regulating the pressure of the gas conveyed to the gas heaters, so that the gas conveyed to the gas heaters has a corresponding pressure.

[0036] According to another exemplary embodiment of the present invention, the heat treatment device further includes: a plurality of pressure gauges respectively arranged on the plurality of gas pipelines for detecting the pressure of the gas conveyed to the gas heaters.

[0037] According to another exemplary embodiment of the present invention, a plurality of exhaust holes are formed on the bottom wall of the heat preservation channel, and the plurality of exhaust holes are respectively connected to the air inlet of the blower through gas pipelines, so that the hot air flow ejected from the hot air gun can be drawn back into the blower.

[0038] According to another exemplary embodiment of the present invention, the hot air gun is arranged to jet hot air flow towards the product passing through the heat preservation channel in a downwardly inclined manner.

[0039] According to another exemplary embodiment of the present invention, the air jet head has a single air jet nozzle, and the air jet holes of the air jet nozzle are rectangular slits, arc-shaped slits or circular holes.

[0040] According to another exemplary embodiment of the present invention, the air jet head has a plurality of air jet nozzles and a connecting part. The plurality of air jet nozzles are arranged side by side, and the connecting part is connected to the plurality of air jet nozzles so that the plurality of air jet nozzles are in gas communication with each other.

[0041] According to another aspect of the present invention, there is provided a product heat treatment system. The product heat treatment system includes: the aforementioned heat treatment device; and a product conveying device for conveying a product through the heat preservation channel of the heat treatment device.

[0042] According to an exemplary embodiment of the present invention, the product conveying device includes: at least a pair of first conveying rollers located at the entrance of the heat preservation channel for clamping and conveying the product; and at least a pair of second conveying rollers located at the exit of the heat preservation channel for clamping and conveying the product. The product is in the form of a strip and is adapted to be clamped between each pair of first conveying rollers and between each pair of second conveying rollers.

[0043] In the foregoing various exemplary embodiments according to the present invention, it is possible to achieve step-by-step heating and step-by-step cooling of the product, avoiding thermal shock of the product caused by sudden cooling and sudden heating. In addition, in the present invention, the heated area of the product can be selected, which can reduce the damage degree of the non-heated area of the product.

[0044] In some of the foregoing exemplary embodiments according to the present invention, the entire heat treatment device is small in volume, reducing the heat loss of the ineffective space and improving the heat treatment efficiency.

[0045] In some of the foregoing exemplary embodiments according to the present invention, the present invention can adapt to products with different structures by replacing different air jet heads.

[0046] Other objects and advantages of the present invention will become apparent and can help to have a comprehensive understanding of the present invention from the description of the present invention with reference to the accompanying drawings below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A three-dimensional schematic diagram showing the heat preservation channel and a plurality of hot air guns of a heat treatment device according to an exemplary embodiment of the present invention;

[0048] Figure 2 A three-dimensional schematic diagram showing a plurality of hot air guns of a heat treatment device according to an exemplary embodiment of the present invention;

[0049] Figure 3A schematic plan view showing a heat preservation channel and a plurality of hot air guns of a heat treatment device according to an exemplary embodiment of the present invention;

[0050] Figure 4 A schematic plan view showing a product heat treatment system according to an exemplary embodiment of the present invention;

[0051] Figure 5 A schematic plan view showing a plurality of hot air guns and a product of a product heat treatment system according to an exemplary embodiment of the present invention;

[0052] Figure 6 A schematic view showing a heat treatment device according to an exemplary embodiment of the present invention;

[0053] Figure 7 A three-dimensional schematic view showing a hot air gun of a heat treatment device according to an exemplary embodiment of the present invention;

[0054] Figure 8 An exploded schematic view showing a hot air gun of a heat treatment device according to an exemplary embodiment of the present invention;

[0055] Figure 9 A cross-sectional view showing a hot air gun of a heat treatment device according to an exemplary embodiment of the present invention;

[0056] Figure 10 A three-dimensional schematic view showing a jet head of a heat treatment device according to another exemplary embodiment of the present invention;

[0057] Figure 11 A three-dimensional schematic view showing a jet head of a heat treatment device according to another exemplary embodiment of the present invention;

[0058] Figure 12 A schematic view showing a hot air gun of a heat treatment device according to another exemplary embodiment of the present invention. Detailed implementation manners

[0059] Next, through embodiments and in combination with the accompanying drawings, the technical solutions of the present invention will be further specifically described. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0060] In addition, in the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments disclosed herein. However, it is obvious that one or more embodiments can be implemented without these specific details. In other instances, well-known structures and devices are shown in diagrammatic form to simplify the drawings.

[0061] According to an overall technical concept of the present invention, a heat treatment device is provided. The heat treatment device includes: a heat preservation channel having an inlet and an outlet opposite to each other in its longitudinal direction and left and right sides opposite to each other in its transverse direction; and a plurality of hot air guns respectively arranged on the left and right sides of the heat preservation channel and arranged along the longitudinal direction of the heat preservation channel for spraying hot air flow to a product passing through the heat preservation channel so as to perform heat treatment on the product passing through the heat preservation channel.

[0062] According to another overall technical concept of the present invention, a product heat treatment system is provided. The product heat treatment system includes: the aforementioned heat treatment device; and a product conveying device for conveying a product through the heat preservation channel of the heat treatment device.

[0063] Figure 1 Showing a three-dimensional schematic view of a heat preservation channel 2 and a plurality of hot air guns 1 of a heat treatment device according to an exemplary embodiment of the present invention; Figure 2 Showing a three-dimensional schematic view of a plurality of hot air guns 1 of a heat treatment device according to an exemplary embodiment of the present invention; Figure 3 Showing a plan view of a heat preservation channel 2 and a plurality of hot air guns 1 of a heat treatment device according to an exemplary embodiment of the present invention; Figure 4 Showing a plan view of a product heat treatment system according to an exemplary embodiment of the present invention; Figure 5 Showing a plan view of a plurality of hot air guns 1 and a product 4 of a product heat treatment system according to an exemplary embodiment of the present invention; Figure 6 Showing a schematic view of a heat treatment device according to an exemplary embodiment of the present invention.

[0064] As Figures 1 to 6 shown, in an exemplary embodiment of the present invention, a heat treatment device is disclosed. The heat treatment device includes: a heat preservation channel (or referred to as a product conveying channel) 2 and a plurality of hot air guns 1. The heat preservation channel 2 has an inlet and an outlet opposite to each other in its longitudinal direction and left and right sides opposite to each other in its transverse direction. The product 4 enters from the inlet of the heat preservation channel 2 and exits from the outlet of the heat preservation channel 2. The plurality of hot air guns 1 are respectively arranged on the left and right sides of the heat preservation channel 2 and arranged along the longitudinal direction of the heat preservation channel 2 for spraying hot air flow to the product 4 passing through the heat preservation channel 2.

[0065] As Figures 1 to 6 shown, in the illustrated embodiment, the temperatures of the hot air flows sprayed by two adjacent hot air guns 1 in the longitudinal direction of the heat preservation channel 2 are different and the temperature difference is not greater than a predetermined value so as to perform heat treatment on the product 4 passing through the heat preservation channel 2. The aforementioned temperature difference can be reasonably set according to actual situations. For example, the aforementioned temperature difference can be 5 degrees, 3 degrees or 1 degree. The smaller the temperature difference, the smaller the thermal shock received by the product 4.

[0066] As Figures 1 to 6 shown, in the illustrated embodiment, a plurality of hot air guns 1 are arranged in pairs on the left and right sides of the heat preservation channel 2. Each pair of hot air guns 1 is opposite in the transverse direction of the heat preservation channel 2, and the temperatures of the hot air flows ejected by each pair of hot air guns 1 are the same.

[0067] As Figures 1 to 6 shown, in an exemplary embodiment of the present invention, the heat preservation channel 2 has a front end and a rear end opposite in its longitudinal direction, and an inlet and an outlet are respectively located at the front end and the rear end of the heat preservation channel 2. The plurality of hot air guns 1 include M + N pairs of hot air guns 1, and the M + N pairs of hot air guns 1 are numbered in sequence starting from the front end of the heat preservation channel 2, where M and N are respectively integers not less than 2. The temperatures of the hot air flows ejected by the first M pairs of hot air guns 1 among the M + N pairs of hot air guns 1 increase step by step, and the temperatures of the hot air flows ejected by the last N pairs of hot air guns 1 decrease step by step.

[0068] As Figures 1 to 6 shown, in the illustrated embodiment, the plurality of hot air guns 1 include five pairs of hot air guns 11, 12, 13, 14, 15. The five pairs of hot air guns 1 are numbered in sequence starting from the front end of the heat preservation channel 2. The temperatures of the hot air flows ejected by the first three pairs of hot air guns 11, 12, 13 among the five pairs of hot air guns 1 increase step by step, and the temperatures of the hot air flows ejected by the last two pairs of hot air guns 14, 15 decrease step by step.

[0069] As Figures 1 to 6 shown, in the illustrated embodiment, the pressures of the hot air flows ejected by two adjacent hot air guns 1 in the longitudinal direction of the heat preservation channel 2 are different. The flows of the hot air flows ejected by two adjacent hot air guns 1 in the longitudinal direction of the heat preservation channel 2 are different. However, the present invention is not limited to the illustrated embodiment. For example, the pressures of the hot air flows ejected by two adjacent hot air guns 1 in the longitudinal direction of the heat preservation channel 2 may be the same. The flows of the hot air flows ejected by two adjacent hot air guns 1 in the longitudinal direction of the heat preservation channel 2 may also be the same.

[0070] As Figures 1 to 6 shown, in the illustrated embodiment, a plurality of hot air guns 1 are arranged in pairs on the left and right sides of the heat preservation channel 2. Each pair of hot air guns 1 is opposite in the transverse direction of the heat preservation channel 2, and the pressures and flows of the hot air flows ejected by each pair of hot air guns 1 are the same.

[0071] As Figures 1 to 6 shown, in the illustrated embodiment, the heat preservation channel 2 has a pair of side walls 22 opposite in its transverse direction, and the hot air gun 1 is mounted on the side wall 22 of the heat preservation channel 2.

[0072] Figure 7 A three-dimensional schematic diagram showing a hot air gun 1 of a heat treatment device according to an exemplary embodiment of the present invention; Figure 8Exploded view of a hot air gun 1 of a heat treatment apparatus according to an exemplary embodiment of the present invention; Figure 9 Cross-sectional view of a hot air gun 1 of a heat treatment apparatus according to an exemplary embodiment of the present invention.

[0073] As Figures 1 to 9 shown, in the illustrated embodiment, the hot air gun 1 includes a jet head 10, and the jet head 10 has a jet nozzle 101. The jet nozzle 101 has jet holes 10a through which hot air flows can be ejected. The jet head 10 is mounted on the side wall 22 of the heat preservation channel 2, and the jet nozzle 101 is located in the heat preservation channel 2 for ejecting hot air flows towards the product 4 passing through the heat preservation channel 2.

[0074] As Figures 1 to 9 shown, in the illustrated embodiment, the hot air gun 1 further includes a jet pipe 100, and the jet pipe 100 has a tapered pipe portion 110. The tapered pipe portion 110 has an air outlet port 110a, and the inner cavity 110b of the tapered pipe portion 110 is tapered and gradually contracts towards the air outlet port 110a. The intake end of the jet head 10 is connected to the air outlet port 110a of the jet pipe 100 to be in gas communication with the jet pipe 100.

[0075] As Figures 1 to 9 shown, in the illustrated embodiment, the jet head 10 is detachably connected to the air outlet port 110a of the jet pipe 100, and the jet head 10 is detachably mounted on the side wall 22 of the heat preservation channel 2, so that the jet head 10 of the heat treatment apparatus can be replaced according to the product 4 to be processed.

[0076] As Figures 1 to 9 shown, in the illustrated embodiment, the jet pipe 100 further has an arc-shaped bent pipe portion 120, one end of the arc-shaped bent pipe portion 120 is connected to the inlet end of the tapered pipe portion 110, and an arc-shaped air flow channel is formed inside the arc-shaped bent pipe portion 120 for changing the flow direction of the hot air flows.

[0077] As Figures 1 to 9 shown, in the illustrated embodiment, the jet pipe 100 further has a flange portion 130 located at the other end of the arc-shaped bent pipe portion 120, so that the jet pipe 100 can be connected to the outlet end of the gas heater 5 through the flange portion 130.

[0078] As Figures 1 to 9 shown, in the illustrated embodiment, the heat treatment apparatus further includes a plurality of gas heaters 5, and the plurality of gas heaters 5 are respectively connected to the inlet ends of the plurality of hot air guns 1 for heating the gas to be delivered to the hot air guns 1, so that the gas delivered to the hot air guns 1 has a corresponding temperature.

[0079] As Figures 1 to 9As shown, in the illustrated embodiment, the heat treatment apparatus further includes: a blower 9 (not shown) and a plurality of gas pipelines 6. The blower 9 has an air outlet 9a for outputting compressed gas. The plurality of gas pipelines 6 are used to connect the plurality of gas heaters 5 to the air outlet 9a of the blower 9 respectively. The blower 9 supplies compressed gas to the plurality of gas heaters 5 via the plurality of gas pipelines 6.

[0080] As Figures 1 to 9 shown, in the illustrated embodiment, the compressed gas is preheated to a predetermined initial temperature in the blower 9 and then heated to a corresponding temperature by the gas heater 5.

[0081] As Figures 1 to 9 shown, in the illustrated embodiment, the heat treatment apparatus further includes a plurality of pressure regulating valves 7. The plurality of pressure regulating valves 7 are respectively disposed on the plurality of gas pipelines 6 for regulating the pressure of the gas delivered to the gas heater 5 so that the gas delivered to the gas heater 5 has a corresponding pressure.

[0082] As Figures 1 to 9 shown, in the illustrated embodiment, the heat treatment apparatus further includes a plurality of pressure gauges 8. The plurality of pressure gauges 8 are respectively disposed on the plurality of gas pipelines 6 for detecting the pressure of the gas delivered to the gas heater 5.

[0083] As Figures 1 to 9 shown, in the illustrated embodiment, a plurality of exhaust holes 22a are formed on the bottom wall 21 of the heat preservation channel 2. The plurality of exhaust holes 22a are respectively connected to the air inlet 9b of the blower 9 via gas pipelines so that the hot air flow ejected from the hot air gun 1 can be drawn back into the blower 9. In this way, energy consumption can be saved.

[0084] As Figures 1 to 9 shown, in the illustrated embodiment, the hot air gun 1 is arranged to eject a hot air flow obliquely downward towards the product 4 passing through the heat preservation channel 2. The hot air flow reaches the bottom of the heat preservation channel 2 and is drawn back into the blower 9.

[0085] As Figures 1 to 9 shown, in the illustrated embodiment, the hot air flow in the heat preservation channel 2 returns to the air inlet source of the hot air gun 1, such as the blower 9, preheats the air inlet source, reduces power consumption, and at the same time further reduces the temperature of the non-directly heated area of the product. Combined with a special air outlet nozzle, the selectivity of the heated area of the product is ensured, and the damage degree of the non-heated area of the product can be reduced.

[0086] As Figures 1 to 9 shown, in the illustrated embodiment, the jet head 10 has a single jet nozzle 101, and the jet holes 10a of the jet nozzle 101 are in the shape of a rectangular slit.

[0087] However, the size and shape of the air jet holes 10a of the air jet head 10 are not limited to Figures 1 - 9 the illustrated embodiment. For example, Figure 10 A perspective schematic view of the air jet head 10 of a heat treatment apparatus showing another exemplary embodiment according to the present invention; Figure 11 A perspective schematic view of the air jet head 10 of a heat treatment apparatus showing another exemplary embodiment according to the present invention.

[0088] As Figure 10 shown, in the illustrated embodiment, the air jet holes 10a of the air jet nozzle 101 are arc-shaped slits. As Figure 11 shown, in the illustrated embodiment, the air jet holes 10a of the air jet nozzle 101 are circular holes.

[0089] Figure 12 A schematic view of the hot air gun 1 of a heat treatment apparatus showing another exemplary embodiment according to the present invention.

[0090] In Figures 1 to 9 the illustrated embodiment, the air jet head 10 has a single air jet nozzle 101. However, the present invention is not limited to the illustrated embodiment. For example, in Figure 12 the illustrated embodiment, the air jet head 10 has a plurality of air jet nozzles 101 and a connecting portion 102. The plurality of air jet nozzles 101 are arranged side by side, and the connecting portion 102 is connected to the plurality of air jet nozzles 101 so that the plurality of air jet nozzles 101 are in gas communication with each other. Each air jet nozzle 101 of the air jet head 10 has an air jet hole 10a.

[0091] As Figures 1 to 12 shown, in another exemplary embodiment of the present invention, a product heat treatment system is also disclosed. The product heat treatment system includes: a heat treatment apparatus; and a product conveying device 3 for conveying a product 4 through a heat preservation channel 2 of the heat treatment apparatus.

[0092] As Figure 4 shown, in the illustrated embodiment, the product conveying device 3 includes: at least a pair of first conveying rollers 3a and at least a pair of second conveying rollers 3b. At least a pair of first conveying rollers 3a are located at the entrance of the heat preservation channel 2 for clamping and conveying the product 4. At least a pair of second conveying rollers 3b are located at the exit of the heat preservation channel 2 for clamping and conveying the product 4. In the illustrated embodiment, the product 4 is in the form of a strip and is adapted to be clamped between each pair of first conveying rollers 3a and between each pair of second conveying rollers 3b. The product 4 can be a terminal strip or other products that need heat treatment.

[0093] The present invention first proposes and designs a quantifiable and monitorable multi-stage selective high-pressure hot air heat treatment. Compressed air is respectively adjusted to specific pressures and blown into several heating guns to be heated to different temperatures to achieve multi-stage heat treatment, which can avoid thermal shock caused by sudden cooling and heating (for example, the reflow temperature of tin is 150 - 350 degrees Celsius, and the thermal diffusion temperature of the silver coating is 100 - 300 degrees Celsius). The hot air flow will change direction along the curved surface and generate a sharp pressure rise through some special designs, so that the high-pressure hot air flow can be selectively or integrally ejected onto the product. The functions of the present invention include but are not limited to reflow soldering to reduce whiskers or insertion force, drying to dehumidify, glue curing, preheating to eliminate hydrogen embrittlement, thermal diffusion to increase adhesion, etc. At present, the invention has been successfully tested in tin reflow soldering, reducing the insertion and extraction force and silver baking to increase the bonding force.

[0094] Those skilled in the art can understand that the embodiments described above are all exemplary, and those skilled in the art can make improvements to them. The structures described in various embodiments can be freely combined without conflicts in structure or principle. These changes should reasonably fall within the protection scope of the present invention.

[0095] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the present invention and should not be construed as a limitation to the present invention.

[0096] Although some embodiments of the general concept of the present invention have been shown and described, those of ordinary skill in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the general concept of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0097] It should be noted that the term "comprising" does not exclude other elements or steps, and the terms "a" or "an" do not exclude a plurality. Additionally, any element label in the claims should not be construed as limiting the scope of the present invention.

Claims

1. A heat treatment apparatus, characterized in that, Comprising: A heat preservation channel (2), having an inlet and an outlet that are opposite to each other in its longitudinal direction and left and right sides that are opposite to each other in its transverse direction; And A plurality of hot air guns (1), respectively arranged on the left and right sides of the heat preservation channel (2) and arranged along the longitudinal direction of the heat preservation channel (2), for spraying hot air streams to a product (4) passing through the heat preservation channel (2), so as to perform heat treatment on the product (4) passing through the heat preservation channel (2).

2. The heat treatment device according to claim 1, wherein: The temperatures of the hot air streams sprayed by two adjacent hot air guns (1) in the longitudinal direction of the heat preservation channel (2) are different and the temperature difference is not greater than a predetermined value.

3. The heat treatment device according to claim 2, wherein: The plurality of hot air guns (1) are arranged in pairs on the left and right sides of the heat preservation channel (2), each pair of hot air guns (1) is opposite to each other in the transverse direction of the heat preservation channel (2), and the temperatures of the hot air streams sprayed by each pair of hot air guns (1) are the same.

4. The heat treatment device according to claim 3, wherein: The heat preservation channel (2) has a front end and a rear end that are opposite to each other in its longitudinal direction, and the inlet and the outlet are respectively located at the front end and the rear end of the heat preservation channel (2); The plurality of hot air guns (1) include M + N pairs of hot air guns (1), and the M + N pairs of hot air guns (1) are sequentially numbered starting from the front end of the heat preservation channel (2), where M and N are respectively integers not less than 2; The temperatures of the hot air streams sprayed by the first M pairs of hot air guns (1) among the M + N pairs of hot air guns (1) increase step by step, and the temperatures of the hot air streams sprayed by the latter N pairs of hot air guns (1) decrease step by step.

5. The heat treatment device according to claim 2, wherein: The pressures of the hot air streams sprayed by two adjacent hot air guns (1) in the longitudinal direction of the heat preservation channel (2) are different; and / or The flow rates of the hot air streams sprayed by two adjacent hot air guns (1) in the longitudinal direction of the heat preservation channel (2) are different.

6. The heat treatment device according to claim 2, wherein: The plurality of hot air guns (1) are arranged in pairs on the left and right sides of the heat preservation channel (2), each pair of hot air guns (1) is opposite to each other in the transverse direction of the heat preservation channel (2), and the pressures and flow rates of the hot air streams sprayed by each pair of hot air guns (1) are the same.

7. The heat treatment device according to claim 2, wherein: The heat preservation channel (2) has a pair of side walls (22) that are opposite to each other in its transverse direction, and the hot air gun (1) is installed on the side wall (22) of the heat preservation channel (2).

8. The heat treatment device according to claim 7, wherein: The hot air gun (1) includes a jet head (10), the jet head (10) has a jet nozzle (101), and the jet nozzle (101) has jet holes (10a) that allow hot air streams to be sprayed out; The jet head (10) is installed on the side wall (22) of the heat preservation channel (2), and the jet nozzle (101) is located in the heat preservation channel (2) for spraying hot air streams to a product (4) passing through the heat preservation channel (2).

9. The heat treatment apparatus according to claim 8, characterized in that: The hot air gun (1) further includes a jet pipe (100), the jet pipe (100) has a tapered pipe portion (110), the tapered pipe portion (110) has an air outlet port (110a), and the inner cavity (110b) of the tapered pipe portion (110) is tapered and gradually contracts towards the air outlet port (110a); The intake end of the jet head (10) is connected to the air outlet port (110a) of the jet pipe (100) to be in gas communication with the jet pipe (100).

10. The heat treatment apparatus according to claim 9, characterized in that: The jet head (10) is detachably connected to the air outlet port (110a) of the jet pipe (100), and the jet head (10) is detachably mounted on the side wall (22) of the heat preservation channel (2), so that the jet head (10) of the heat treatment apparatus can be replaced according to the product (4) to be processed.

11. The heat treatment apparatus according to claim 9, characterized in that: The jet pipe (100) further has an arc-shaped elbow portion (120), one end of the arc-shaped elbow portion (120) is connected to the inlet end of the tapered pipe portion (110), and an arc-shaped air flow channel is formed inside the arc-shaped elbow portion (120) for changing the flow direction of the hot air flow.

12. The heat treatment apparatus according to claim 11, characterized in that: The jet pipe (100) further has a flange portion (130) at the other end of the arc-shaped elbow portion (120), so that the jet pipe (100) can be connected to the outlet end of the gas heater (5) through the flange portion (130).

13. The heat treatment apparatus according to claim 2, wherein, Further comprising: A plurality of gas heaters (5), respectively connected to the inlet ends of the plurality of hot air guns (1), for heating the gas to be conveyed to the hot air guns (1), so that the gas conveyed to the hot air guns (1) has a corresponding temperature.

14. The heat treatment apparatus according to claim 13, characterized in that, Further comprising: A blower (9), having an air outlet (9a) for outputting compressed gas; and A plurality of gas pipelines (6), for respectively connecting the plurality of gas heaters (5) to the air outlet (9a) of the blower (9), The blower (9) supplies compressed gas to the plurality of gas heaters (5) via the plurality of gas pipelines (6).

15. The heat treatment apparatus according to claim 14, characterized in that: The compressed gas is preheated to a predetermined initial temperature in the blower (9), and then heated to a corresponding temperature by the gas heater (5).

16. The heat treatment apparatus according to claim 14, characterized in that, Further comprising: A plurality of pressure regulating valves (7), respectively arranged on the plurality of gas pipelines (6), for regulating the pressure of the gas conveyed to the gas heaters (5), so that the gas conveyed to the gas heaters (5) has a corresponding pressure.

17. The heat treatment apparatus according to claim 16, wherein Further comprising: A plurality of pressure gauges (8), respectively arranged on the plurality of gas pipelines (6), for detecting the pressure of the gas conveyed to the gas heaters (5).

18. The heat treatment apparatus according to claim 14, wherein: A plurality of exhaust holes (22a) are formed on the bottom wall (21) of the heat preservation channel (2), and the plurality of exhaust holes (22a) are respectively connected to the air inlet (9b) of the blower (9) via a gas pipeline, so that the hot air flow ejected from the hot air gun (1) can be drawn back into the blower (9).

19. The heat treatment apparatus according to claim 18, wherein: The hot air gun (1) is arranged to eject hot air flow towards the product (4) passing through the heat preservation channel (2) in an inclined downward manner.

20. The heat treatment apparatus according to claim 8, wherein: The air jet head (10) has a single air jet nozzle (101), and the air jet holes (10a) of the air jet nozzle (101) are rectangular slits, arc-shaped slits or circular holes.

21. The heat treatment apparatus according to claim 8, wherein: The air jet head (10) has a plurality of air jet nozzles (101) and a communication part (102), the plurality of air jet nozzles (101) are arranged side by side, and the communication part (102) is connected to the plurality of air jet nozzles (101) so that the plurality of air jet nozzles (101) are in gas communication with each other.

22. A product heat treatment system, characterized in that, Comprising: The heat treatment apparatus according to any one of claims 1-21; And A product conveying device (3) for conveying the product (4) through the heat preservation channel (2) of the heat treatment apparatus.

23. The product heat treatment system according to claim 22, wherein: The product conveying device (3) includes: At least a pair of first conveying rollers (3a), located at the entrance of the heat preservation channel (2), for clamping and conveying the product (4); and At least a pair of second conveying rollers (3b), located at the exit of the heat preservation channel (2), for clamping and conveying the product (4), The product (4) is in the form of a strip and is adapted to be clamped between each pair of first conveying rollers (3a) and between each pair of second conveying rollers (3b).

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