Energy-saving, uniform temperature open sintering furnace for the production of DCB copper-clad ceramic substrates

Abstract

The present invention discloses an energy-saving, uniform temperature open sintering furnace for the production of DCB copper-clad ceramic substrates, belonging to the technical field of sintering furnaces, and comprising a sintering furnace body, wherein a feeding platform and a discharging platform are respectively arranged on both sides of the sintering furnace body, and a sintering furnace chamber is arranged in the sintering furnace body. The present invention can preheat the copper-clad ceramic substrate that has just entered the sintering furnace body by setting a holding port, a heat dissipation port and a four-channel heat exchanger, thereby saving energy consumption caused by preheating. By setting a heating tube, high-temperature gas can also be used to drive a waste heat driving mechanism. By setting a preheating detection mechanism, the detection accuracy is guaranteed to the greatest extent. By setting a waste heat driving mechanism, air pressure can be provided for the dust removal port, so that it provides a dust removal function for the copper-clad ceramic substrate. The slide plate and the connecting clamp on the reciprocating screw can also position the copper-clad ceramic substrate, so that its position on the material conveyor belt remains centered, thereby improving the heating efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sintering furnaces, and in particular is an energy-saving, uniform-temperature open-type sintering furnace used for producing a DCB copper-clad ceramic substrate. Background Art

[0002] DCB copper-clad ceramic substrate is a technology that directly bonds copper foil to a ceramic substrate. It is widely used in power modules and high-frequency circuits and is favored for its excellent thermal conductivity and electrical insulation properties. In order to ensure a strong and void-free bond between copper and ceramic, precise sintering treatment at high temperature is required. The DCB copper-clad ceramic substrate dedicated sintering furnace is designed to provide a uniform high-temperature environment to ensure high-quality bonding between the copper layer and the ceramic substrate.

[0003] The existing open sintering furnace for the production of DCB copper-clad ceramic substrates still has the following shortcomings:

[0004] When the existing open sintering furnace used for the production of DCB copper-clad ceramic substrates is in use, in order to better fit the sintering process and meet the three-stage requirements of preheating, high temperature maintenance and heat dissipation, it is necessary to provide different temperature supports in the furnace. When the open sintering furnace is sintering, the heating steps are cumbersome and the operations required are very complicated, which requires a lot of energy support and cannot meet the needs of energy conservation and emission reduction.

[0005] When preheating the DCB copper-clad ceramic substrate, the ceramic needs to be basically preheated to the specified temperature before entering the high-temperature holding stage. However, during preheating, due to poor gas fluidity in the furnace and uneven distribution of heat sources, the DCB copper-clad ceramic substrate is prone to local overheating or cold spots. In addition, in order to ensure the stability of the DCB copper-clad ceramic substrate on the conveyor belt and the neatness of the substrate surface, the substrate cannot be directly measured by the sensor. This results in the on-site staff being unable to clearly understand the temperature of the DCB copper-clad ceramic substrate, which in turn makes it impossible to judge the sintering process, affecting the yield rate of the finished product.

[0006] When sintering the DCB copper-clad ceramic substrate, it is necessary to ensure that the workshop is dust-free. The DCB copper-clad ceramic substrate has extremely high cleanliness requirements. Any tiny particles, dust or impurities may affect the bonding quality between the copper layer and the ceramic, resulting in product defects or performance degradation, but it is obviously impossible to achieve complete dust-free. The existing measures can only be used to remove dust through air showers and dust-free clothing as much as possible. However, the temperature in the sintering workshop is extremely high, and the sweat on the skin of the staff is dried and the dirt, wearing dust-free clothing and improper operation when entering the air shower room will lead to unavoidable board surface contamination. Summary of the invention

[0007] In order to overcome the above defects, the present invention provides an energy-saving and uniform temperature open sintering furnace for use in the production of DCB copper-clad ceramic substrates, which solves the problems in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solution: an energy-saving, uniform temperature open sintering furnace for the production of DCB copper-clad ceramic substrates, comprising:

[0009] A sintering furnace body, wherein a feeding platform and a discharging platform are respectively arranged on both sides of the sintering furnace body, a sintering furnace chamber is provided in the sintering furnace body, a holding port and a heat dissipation port are provided in the sintering furnace body, the holding port and the heat dissipation port both penetrate the sintering furnace body and are arranged at the inner top of the sintering furnace chamber, exhaust fans are arranged in the holding port and the heat dissipation port, a four-channel heat exchanger is provided in the sintering furnace body, a hot air inlet, a hot air outlet, a cold air inlet and a cold air outlet are arranged on the four-channel heat exchanger, and a hot air inlet and a hot air outlet are provided between the hot air inlet and the holding port, and between the cold air inlet and the heat dissipation port of the four-channel heat exchanger They are all connected by pipelines, a heat pipe is connected to the hot gas outlet of the four-channel heat exchanger, an electromagnetic three-way regulating valve is connected to one end of the heat pipe away from the four-channel heat exchanger, the input end of the electromagnetic three-way regulating valve is connected to the heat pipe, and two output ends of the electromagnetic three-way regulating valve are respectively connected to dual-output heating ports and heating pipes through pipelines, and heat conduction pipes are connected to the two output ends of the dual-output heating ports, the heat conduction pipes penetrate the sintering furnace body and the pipe mouth is located at the top of the sintering furnace chamber, a waste heat driving mechanism is provided on the heating pipe, and a preheating detection mechanism is provided in the sintering furnace body;

[0010] The waste heat driving mechanism includes a composite bracket fixedly connected to the inner walls of both sides of the sintering furnace body, a piston cylinder is fixedly connected to the composite bracket, the ends of the two piston cylinders away from each other are both opened, and the sides of the two piston cylinders away from each other are provided with a heat dissipation sleeve plate, the ends of the two piston cylinders close to each other penetrate the heating tube and are located in the heating tube, a piston is slidably connected in the piston cylinder, a sleeve shaft is fixedly connected to one side of the piston, a fixed shaft is slidably connected in the sleeve shaft, the fixed shaft penetrates the sleeve shaft and is slidably connected thereto, a heat insulator is fixedly connected to one side of the fixed shaft, a dual-axis connector is fixedly connected to the sleeve shaft, a rotating frame plate is fixedly connected to the composite bracket, two crankshafts are rotatably connected in the rotating frame plate, a first support plate is rotatably connected to the output end of the crankshaft, the first support plate is rotatably connected to the dual-axis connector at one end away from the crankshaft, an angle plate is fixedly connected to the ends of the two crankshafts close to each other, a connecting clip is rotatably connected between the two angle plates, and the other end of the connecting clip is rotatably connected to the fixed shaft, One side of the rotating frame plate is rotatably connected with an inertia flywheel, the rotating shaft of the inertia flywheel penetrates the rotating frame plate and is coaxially fixedly connected to the crankshaft, and booster cylinders are fixedly connected to the inner walls of both sides of the sintering furnace body, and a reciprocating threaded rod is rotatably connected in the booster cylinder, a piston plate is slidably connected in the booster cylinder, the reciprocating threaded rod penetrates the piston plate and is threadedly connected thereto, the rotating shaft of the inertia flywheel is coaxially fixedly connected with the reciprocating threaded rod, one side of the booster cylinder is rotatably connected to a No. 1 bevel gear, and both sides of the sintering furnace body are rotatable A transmission shaft is dynamically connected, and one end of the transmission shaft close to each other is coaxially fixedly connected with a reciprocating screw, a slide is threadedly connected to the reciprocating screw, a clamp is fixedly connected to the bottom of the slide, a through groove is opened in the sintering furnace body at a position corresponding to the slide, the slide is slidably connected in the through groove, a No. 2 bevel gear is coaxially fixedly connected to the transmission shaft, the No. 1 bevel gear and the No. 2 bevel gear are meshed with each other, and two dust removal ports are fixedly connected to the feed table, and the dust removal port is connected to the booster cylinder on the corresponding side;

[0011] A material conveyor belt is arranged between the feeding platform and the discharging platform, and the material conveyor belt is located in the sintering furnace. Driving rollers are arranged in both the feeding platform and the discharging platform, and the material conveyor belt is sleeved on two driving rollers.

[0012] As a further solution of the present invention: the preheating detection mechanism includes a notch opened on the side wall of one side of the sintering furnace chamber, a driving pulley is coaxially fixedly connected to the driving roller of the material conveyor belt close to the feeding table, a hexagonal frame is rotatably connected in the notch, six ceramic substrates are fixedly connected to the hexagonal frame, a driven bevel gear is coaxially fixedly connected to one side of the hexagonal frame, a matching pulley is rotatably connected in the sintering furnace body, a belt is sleeved between the driving pulley and the matching pulley, an active bevel gear is coaxially fixedly connected to the matching pulley, and the active bevel gear and the driven bevel gear are meshed with each other.

[0013] As a further solution of the present invention: the top and the bottom of the notch are fixedly connected with a spring box, two springs are arranged in the spring box, two insulation boards are slidably connected in the spring box, the insulation board is fitted with the ceramic substrate on the corresponding side, and a temperature sensor is arranged on the side wall of the notch, and the temperature sensor is fitted with the ceramic substrate on the corresponding side.

[0014] As a further solution of the present invention: a control box is arranged on the top of the sintering furnace body, and a detection module and a control module are arranged in the control box. The control module is connected to the detection module signal, the detection module is connected to the temperature sensor signal, and the control module is connected to the electromagnetic three-way regulating valve signal.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention is provided with a holding port, a heat dissipation port and a four-channel heat exchanger. The high-temperature gas generated in the holding port is sucked in, and after heat exchange through the four-channel heat exchanger, the low-temperature gas in the heat dissipation port is sucked in, and after heating, it is discharged from the dual-output heating port. This can preheat the copper-clad ceramic substrate that has just entered the furnace body of the sintering furnace, thereby saving the energy consumption caused by preheating. Moreover, through the setting of the heat dissipation port, rapid heat dissipation can also be performed to promote gas circulation in the device. In addition, through the setting of the heating tube, the high-temperature gas can also be used to drive the waste heat driving mechanism, thereby maximizing the use of the heat source in the device, meeting the requirements of energy conservation, emission reduction and environmental protection.

[0017] The present invention sets a preheating detection mechanism, and the hexagonal frame is rotated by linking the material conveyor belt. A plurality of ceramic substrates made of the same material as the copper-clad ceramic substrate are set on the hexagonal frame. When preheating, the temperature of the ceramic substrate is measured by a temperature sensor, so that the temperature of the copper-clad ceramic substrate can be known indirectly, and the pollution risk caused by direct detection is also avoided. In addition, through the setting of the control box, the temperature sensor can control the electromagnetic three-way regulating valve, so that the flow of hot air flowing in through the dual output heating ports can be controlled according to the temperature, so that the flow of hot air can be adjusted according to the actual temperature conditions, and the temperature can be controlled. In addition, the setting of the heat insulation board can isolate the ceramic substrates other than the ceramic substrate to be detected, so that the relative temperature of other ceramic substrates is lower, which is convenient for detection. Multiple ceramic substrates are rotated for detection, and the detection accuracy is guaranteed to the greatest extent.

[0018] The present invention sets a waste heat driving mechanism. According to the Stirling cycle, the piston cylinder is heated by the high-temperature airflow flowing into the heating tube. The high-temperature gas will cause the gas in the piston cylinder to expand, thereby causing the piston to move. Through the setting of the crankshaft and the angle plate, the heat insulator with low specific heat capacity will move to the side away from the piston, so that the high-temperature gas in the piston cylinder will move to the side of the heat dissipation sleeve. Since the heat dissipation sleeve has a large heat dissipation area and is away from the side of the high-temperature airflow, the gas temperature in the piston cylinder decreases and the volume shrinks, so the piston will move to the side of the heating tube, and the heat insulator will move synchronously to the side close to the piston. Most of the gas moves to the side close to the heating tube. One side of the heat pipe is heated again. During this process, the inertia flywheel will rotate. The inertia provided by the rotation of the inertia flywheel will prompt the piston to return to the initial position. In this reciprocating manner, the inertia flywheel can keep rotating. The power provided by the inertia flywheel drives the reciprocating threaded rod in the booster cylinder to rotate. The booster cylinder provides air pressure to the dust removal port, so that it provides dust removal function for the copper-clad ceramic substrate. At the same time, through the setting of the No. 1 bevel gear and the No. 2 bevel gear, the reciprocating screw rotates synchronously, and the slide plate and the connecting splint on the reciprocating screw will position the copper-clad ceramic substrate, so that its position on the material conveyor belt remains centered, thereby improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional internal structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the holding port of the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the waste heat driving mechanism of the present invention;

[0023] Figure 5It is a schematic diagram of the three-dimensional internal structure of the piston cylinder of the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional internal structure of the booster cylinder of the present invention;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the preheating detection mechanism of the present invention;

[0026] Figure 8 It is a schematic diagram of the three-dimensional internal structure of the spring box of the present invention.

[0027] In the figure: 1 sintering furnace body, 2 feeding platform, 3 discharging platform, 4 holding port, 5 heat dissipation port, 6 exhaust fan, 7 four-channel heat exchanger, 8 electromagnetic three-way regulating valve, 9 double output heating port, 10 heating pipe, 11 material conveyor belt, 12 composite bracket, 13 piston cylinder, 14 heat dissipation sleeve plate, 15 piston, 16 sleeve shaft, 17 fixed shaft, 18 heat insulator, 19 double shaft connector, 20 rotating frame plate, 21 crankshaft, 22 first support plate, 2 3 Angle plate, 24 connecting clamp, 25 inertia flywheel, 26 booster cylinder, 27 reciprocating threaded rod, 28 piston plate, 29 No. 1 bevel gear, 30 clamping plate, 31 No. 2 bevel gear, 32 dust removal port, 33 driving pulley, 34 hexagonal frame, 35 ceramic substrate, 36 driven bevel gear, 37 matching pulley, 38 driving bevel gear, 39 spring box, 40 spring, 41 heat insulation board, 42 temperature sensor, 43 control box, 44 reciprocating screw. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0029] like Figure 1-Figure 8 As shown, the present invention provides a technical solution:

[0030] A sintering furnace body 1, a feeding platform 2 and a discharging platform 3 are respectively arranged on both sides of the sintering furnace body 1, a sintering furnace chamber is opened in the sintering furnace body 1, a holding port 4 and a heat dissipation port 5 are arranged in the sintering furnace body 1, the holding port 4 and the heat dissipation port 5 both penetrate the sintering furnace body 1 and are arranged at the inner top of the sintering furnace chamber, exhaust fans 6 are arranged in the holding port 4 and the heat dissipation port 5, a four-channel heat exchanger 7 is arranged in the sintering furnace body 1, a hot air inlet, a hot air outlet, a cold air inlet and a cold air outlet are opened on the four-channel heat exchanger 7, the hot air inlet of the four-channel heat exchanger 7 and the holding port 4, the cold air inlet and the heat dissipation port 5 are connected by pipelines, a heat pipe is connected to the hot air outlet of the four-channel heat exchanger 7, an end of the heat pipe away from the four-channel heat exchanger 7 is connected to an electromagnetic three-way regulating valve 8, the input end of the electromagnetic three-way regulating valve 8 is connected to the heat pipe, and the two ends of the electromagnetic three-way regulating valve 8 The output ends are connected by pipelines and are provided with dual-output heating ports 9 and heating tubes 10, and both output ends of the dual-output heating ports 9 are connected with heat-conducting tubes, which penetrate the sintering furnace body 1 and have their pipe openings located at the top of the sintering furnace chamber. A waste heat driving mechanism is provided on the heating tube 10, and a preheating detection mechanism is provided in the sintering furnace body 1. The exhaust fan 6 in the holding port 4 and the heat dissipation port 5 can make the gas on the surface of the copper-clad ceramic substrate at the corresponding position in the sintering furnace chamber circulate quickly, and the high-temperature gas will flow into the four-channel heat exchanger 7 through the pipeline. The temperature of the surface of the copper-clad ceramic substrate at the corresponding holding port 4 position is much higher than that of the copper-clad ceramic substrate at the heat dissipation port 5 position. The four-channel heat exchanger 7 absorbs this part of the heat, and the temperature of the gas flowing in from the heat dissipation port 5 will be further heated, and finally discharged to the electromagnetic three-way regulating valve 8, and diverted to the dual-output heating port 9 and the heating tube 10;

[0031] A material conveyor belt 11 is provided between the feed table 2 and the discharge table 3. The material conveyor belt 11 is located in the sintering furnace. Driving rollers are provided in both the feed table 2 and the discharge table 3. The material conveyor belt 11 is sleeved on two driving rollers. The material conveyor belt 11 is a metal woven conveyor belt, which is resistant to high temperatures and can transport materials.

[0032] The waste heat driving mechanism includes a composite bracket 12 fixedly connected to the inner walls of both sides of the sintering furnace body 1, a piston cylinder 13 fixedly connected to the composite bracket 12, the ends of the two piston cylinders 13 away from each other are both opened, the sides of the two piston cylinders 13 away from each other are both provided with a heat dissipation sleeve 14, the ends of the two piston cylinders 13 close to each other pass through the heating tube 10 and are located in the heating tube 10, a piston 15 is slidably connected in the piston cylinder 13, a sleeve shaft 16 is fixedly connected to one side of the piston 15, a fixed shaft 17 is slidably connected in the sleeve shaft 16, the fixed shaft 17 passes through the sleeve shaft 16 and is slidably connected thereto, a heat insulator 18 is fixedly connected to one side of the fixed shaft 17, a dual-axis connector 19 is fixedly connected to the sleeve shaft 16, and a rotating frame is fixedly connected to the composite bracket 12. Plate 20, two crankshafts 21 are rotatably connected in the rotating frame plate 20, a first support plate 22 is rotatably connected to the output end of the crankshaft 21, and the first support plate 22 is rotatably connected to the dual-axis connector 19 at one end away from the crankshaft 21, and the two crankshafts 21 are fixedly connected to one end close to each other with an angle plate 23, a connecting clamp 24 is rotatably connected between the two angle plates 23, and the other end of the connecting clamp 24 is rotatably connected to the fixed shaft 17, an inertia flywheel 25 is rotatably connected to one side of the rotating frame plate 20, and the rotating shaft of the inertia flywheel 25 passes through the rotating frame plate 20 and is coaxially fixedly connected to the crankshaft 21, and a booster cylinder 26 is fixedly connected to the inner walls of both sides of the sintering furnace body 1, a reciprocating threaded rod 27 is rotatably connected in the booster cylinder 26, a piston plate 28 is slidably connected in the booster cylinder 26, and a reciprocating threaded rod 27 is rotatably connected in the booster cylinder 26. The rod 27 penetrates the piston plate 28 and is threadedly connected thereto, the rotating shaft of the inertia flywheel 25 is coaxially fixedly connected to the reciprocating threaded rod 27, one side of the boost cylinder 26 is rotatably connected to a No. 1 bevel gear 29, both sides of the sintering furnace body 1 are rotatably connected with a transmission shaft, one end of the transmission shaft close to each other is coaxially fixedly connected with a reciprocating screw 44, a slide plate is threadedly connected to the reciprocating screw 44, a clamping plate 30 is fixedly connected to the bottom of the slide plate, a through groove is opened in the sintering furnace body 1 corresponding to the position of the slide plate, the slide plate is slidably connected in the through groove, a No. 2 bevel gear 31 is coaxially fixedly connected to the transmission shaft, the No. 1 bevel gear 29 and the No. 2 bevel gear 31 are meshed with each other, two dust removal ports 32 are fixedly connected to the feed table 2, the dust removal port 32 is connected to the boost cylinder 26 on the corresponding side, and a through groove is provided in the sintering furnace body 1. By setting up a waste heat driving mechanism, according to the Stirling cycle, the piston cylinder 13 is heated by the high-temperature airflow flowing into the heating tube 10, and the high-temperature gas will cause the gas in the piston cylinder 13 to expand, thereby causing the piston 15 to move. Through the setting of the crankshaft 21 and the angle plate 23, the heat insulator 18 with low specific heat capacity will move to the side away from the piston 15, so that the high-temperature gas in the piston cylinder 13 will move to the side of the heat dissipation sleeve 14. Since the heat dissipation sleeve 14 has a large heat dissipation area and is away from the high-temperature airflow, the gas temperature in the piston cylinder 13 decreases and the volume shrinks, then the piston 15 will move to the side of the heating tube 10, and the heat insulator 18 will move synchronously to the side close to the piston 15. Most of the gas moves to the side close to the heating tube 10 and is heated again.During this process, the inertia flywheel 25 will rotate, and the inertia provided by the rotation of the inertia flywheel 25 will cause the piston 15 to return to the initial position. In this reciprocating manner, the inertia flywheel 25 can keep rotating, and the power provided by the inertia flywheel 25 drives the reciprocating threaded rod 27 in the booster cylinder 26 to rotate. The booster cylinder 26 provides air pressure for the dust removal port 32, so that it provides dust removal function for the copper-clad ceramic substrate 35. At the same time, through the setting of the first bevel gear 29 and the second bevel gear 31, the reciprocating screw 44 rotates synchronously, and the slide plate and the connecting clamp 30 on the reciprocating screw 44 will position the copper-clad ceramic substrate so that its position on the material conveyor belt 11 remains centered, thereby improving the heating efficiency. The hot air outlet of the four-channel heat exchanger 7 and the heating pipe 10 need to be connected to the exhaust gas exhaust pipe for exhaust gas treatment and discharge;

[0033] The preheating detection mechanism includes a notch on the side wall of one side of the sintering furnace chamber, a driving pulley 33 is coaxially fixedly connected to the driving roller of the material conveyor belt 11 near the feeding table 2, a hexagonal frame 34 is rotatably connected in the notch, six ceramic substrates 35 are fixedly connected to the hexagonal frame 34, a driven bevel gear 36 is coaxially fixedly connected to one side of the hexagonal frame 34, a matching pulley 37 is rotatably connected in the sintering furnace body 1, a belt is sleeved between the driving pulley 33 and the matching pulley 37, an active bevel gear 38 is coaxially fixedly connected to the matching pulley 37, the active bevel gear 38 and the driven bevel gear 36 are meshed with each other, a spring box 39 is fixedly connected to the top and bottom of the notch, two springs 40 are arranged in the spring box 39, two heat insulation boards 41 are slidably connected in the spring box 39, the heat insulation boards 41 are fitted with the ceramic substrates 35 on the corresponding side, a temperature sensor 42 is arranged on the side wall of the notch, and the temperature sensor 42 is connected to the ceramic substrates 35 on the corresponding side. The plates 35 are fitted together, and a preheating detection mechanism is set up. The hexagonal frame 34 is rotated by linking the material conveyor belt 11. A plurality of ceramic substrates 35 made of the same material as the copper-clad ceramic substrate are set on the hexagonal frame 34. When preheating, the temperature of the ceramic substrate 35 is measured by the temperature sensor 42, so that the temperature of the copper-clad ceramic substrate can be known indirectly, and the risk of pollution caused by direct detection is also avoided. In addition, through the setting of the control box 43, the temperature sensor 42 can control the electromagnetic three-way regulating valve 8, so that the flow of hot air flowing in through the dual output heating port 9 can be controlled according to the temperature, so that the flow of hot air can be adjusted according to the actual temperature situation, and the temperature can be controlled. In addition, the setting of the heat insulation board 41 can isolate the ceramic substrates 35 other than the ceramic substrate 35 being detected, so that the relative temperature of other ceramic substrates 35 is lower, which is convenient for detection. Multiple ceramic substrates 35 are rotated for detection to maximize the detection accuracy;

[0034] A control box 43 is provided on the top of the sintering furnace body 1. A detection module and a control module are provided in the control box 43. The control module is signal-connected with the detection module, the detection module is signal-connected with the temperature sensor 42, and the control module is signal-connected with the electromagnetic three-way regulating valve 8. The electromagnetic three-way regulating valve 8 is controlled through the centralized control of the control box 43, so that the waste heat generated by the device is used more reasonably. On the basis of ensuring energy saving and emission reduction of the device, various functions are realized, thereby ensuring the rationality and stability of the sintering process of the copper-clad ceramic substrate, and further reducing unnecessary integrated control and other losses in the sintering furnace.

[0035] The working principle of the present invention is:

[0036] The exhaust fan 6 in the holding port 4 and the heat dissipation port 5 can make the gas on the surface of the copper-clad ceramic substrate at the corresponding position in the sintering furnace flow quickly, and the high-temperature gas will flow into the four-channel heat exchanger 7 through the pipeline. The temperature of the surface of the copper-clad ceramic substrate at the corresponding holding port 4 is much higher than that of the copper-clad ceramic substrate at the heat dissipation port 5. The four-channel heat exchanger 7 absorbs this part of the heat, and the temperature of the gas flowing in from the heat dissipation port 5 will be further heated, and finally discharged to the electromagnetic three-way regulating valve 8, and diverted to the dual-output heating port 9 and the heating pipe 10;

[0037] By setting a waste heat driving mechanism, according to the Stirling cycle, the piston cylinder 13 is heated by the high-temperature airflow flowing into the heating tube 10, and the high-temperature gas will cause the gas in the piston cylinder 13 to expand, thereby causing the piston 15 to move. Through the setting of the crankshaft 21 and the angle plate 23, the heat insulator 18 with low specific heat capacity will move to the side away from the piston 15, so that the high-temperature gas in the piston cylinder 13 will move to the side of the heat dissipation sleeve 14. Since the heat dissipation sleeve 14 has a large heat dissipation area and is away from the high-temperature airflow, the gas temperature in the piston cylinder 13 decreases and the volume shrinks, then the piston 15 will move to the side of the heating tube 10, and the heat insulator 18 will move synchronously to the side close to the piston 15. Most of the gas moves to the side close to the heating tube 10 and is heated again. In this process, the inertia The inertia flywheel 25 will rotate, and the inertia provided by the inertia flywheel 25 when rotating will cause the piston 15 to return to the initial position, and the inertia flywheel 25 can keep rotating by reciprocating. The power provided by the inertia flywheel 25 drives the reciprocating threaded rod 27 in the booster cylinder 26 to rotate, and the booster cylinder 26 provides air pressure for the dust removal port 32, so that it provides dust removal function for the copper-clad ceramic substrate 35. At the same time, through the setting of the first bevel gear 29 and the second bevel gear 31, the reciprocating screw 44 rotates synchronously, and the slide plate and the connecting clamp 30 on the reciprocating screw 44 will position the copper-clad ceramic substrate, so that its position on the material conveyor belt 11 remains centered, thereby improving the heating efficiency. The hot air outlet of the four-channel heat exchanger 7 and the heating pipe 10 need to be connected to the exhaust gas exhaust pipe for exhaust gas treatment and discharge;

[0038] By setting a preheating detection mechanism, the hexagonal frame 34 is rotated by the material conveyor belt 11, and multiple ceramic substrates 35 made of the same material as the copper-clad ceramic substrate are set on the hexagonal frame 34. During preheating, the temperature of the ceramic substrate 35 is measured by the temperature sensor 42, so that the temperature of the copper-clad ceramic substrate can be known indirectly, and the pollution risk caused by direct detection is also avoided. In addition, through the setting of the control box 43, the temperature sensor 42 can control the electromagnetic three-way regulating valve 8, so that the flow of hot air flowing in through the dual output heating port 9 can be controlled according to the temperature, so that the flow of hot air can be adjusted according to the actual temperature situation to achieve temperature control. In addition, the setting of the heat insulation board 41 can isolate the ceramic substrates 35 other than the ceramic substrate 35 being detected, so that the relative temperature of other ceramic substrates 35 is lower, which is convenient for detection. Multiple ceramic substrates 35 are rotated for detection to maximize the detection accuracy;

[0039] Through the centralized control of the control box 43, the electromagnetic three-way regulating valve 8 is controlled, so that the waste heat generated by the device is used more reasonably. On the basis of ensuring energy saving and emission reduction of the device, various functions are realized, the rationality and stability of the sintering process of the copper-clad ceramic substrate are ensured, and unnecessary integrated control and other losses in the sintering furnace are further reduced.

[0040] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. Energy-saving and uniform temperature open sintering furnace used in the production of DCB copper-clad ceramic substrates, characterized in that: include: A sintering furnace body (1), wherein a feeding platform (2) and a discharging platform (3) are respectively arranged on both sides of the sintering furnace body (1), a sintering furnace chamber is provided in the sintering furnace body (1), a holding port (4) and a heat dissipation port (5) are provided in the sintering furnace body (1), the holding port (4) and the heat dissipation port (5) both pass through the sintering furnace body (1) and are arranged at the inner top of the sintering furnace chamber, an exhaust fan (6) is provided in the holding port (4) and the heat dissipation port (5), a four-channel heat exchanger (7) is provided in the sintering furnace body (1), a hot air inlet, a hot air outlet, a cold air inlet and a cold air outlet are provided on the four-channel heat exchanger (7), a hot air inlet of the four-channel heat exchanger (7) is connected to the holding port (4), and a cold air inlet and a cold air outlet are provided between the hot air inlet and the holding port (4), and the cold air inlet and the cold air outlet are provided between the hot air inlet and the holding port (4) of the four-channel heat exchanger (7). The air inlet and the heat dissipation port (5) are connected via a pipeline, a heat pipe is connected to the hot air outlet of the four-channel heat exchanger (7), an end of the heat pipe away from the four-channel heat exchanger (7) is connected to an electromagnetic three-way regulating valve (8), the input end of the electromagnetic three-way regulating valve (8) is connected to the heat pipe, and two output ends of the electromagnetic three-way regulating valve (8) are respectively connected to a dual-output heating port (9) and a heating pipe (10) via a pipeline, and both output ends of the dual-output heating port (9) are connected to a heat conduction pipe, the heat conduction pipe runs through the sintering furnace body (1) and the pipe mouth is located at the top of the sintering furnace chamber, the heating pipe (10) is provided with a waste heat driving mechanism, and a preheating detection mechanism is provided in the sintering furnace body (1); The waste heat driving mechanism comprises a composite bracket (12) fixedly connected to the inner walls of both sides of the sintering furnace body (1), a piston cylinder (13) fixedly connected to the composite bracket (12), the ends of the two piston cylinders (13) away from each other are both opened, the sides of the two piston cylinders (13) away from each other are both provided with a heat dissipation sleeve (14), the ends of the two piston cylinders (13) close to each other pass through the heating tube (10) and are located in the heating tube (10), a piston (15) is slidably connected in the piston cylinder (13), a sleeve shaft (16) is fixedly connected to one side of the piston (15), a fixed shaft (17) is slidably connected in the sleeve shaft (16), and the fixed shaft (17) passes through the sleeve shaft (16) and is slidably connected thereto, a heat insulator (18) is fixedly connected to one side of the fixed shaft (17), a dual-axis connector (19) is fixedly connected to the sleeve shaft (16), a rotating frame plate (20) is fixedly connected to the composite bracket (12), two crankshafts (21) are rotatably connected inside the rotating frame plate (20), a first support plate (22) is rotatably connected to the output end of the crankshaft (21), an end of the first support plate (22) away from the crankshaft (21) is rotatably connected to the dual-axis connector (19), an angle plate (23) is fixedly connected to the ends of the two crankshafts (21) close to each other, a connecting clamp (24) is rotatably connected between the two angle plates (23), and the connecting clamp (24) ) is rotatably connected to a fixed shaft (17); one side of the rotating frame plate (20) is rotatably connected to an inertia flywheel (25); the rotating shaft of the inertia flywheel (25) passes through the rotating frame plate (20) and is coaxially fixedly connected to the crankshaft (21); both sides of the inner wall of the sintering furnace body (1) are fixedly connected to a booster cylinder (26); a reciprocating threaded rod (27) is rotatably connected inside the booster cylinder (26); a piston plate (28) is slidably connected inside the booster cylinder (26); the reciprocating threaded rod (27) passes through the piston plate (28) and is threadedly connected thereto; the rotating shaft of the inertia flywheel (25) is coaxially fixedly connected to the reciprocating threaded rod (27); one side of the booster cylinder (26) is rotatably connected to a bevel gear (29), both sides of the sintering furnace body (1) are rotatably connected with a transmission shaft, one end of the transmission shaft close to each other is coaxially fixedly connected with a reciprocating screw (44), a slide plate is threadedly connected to the reciprocating screw (44), a clamping plate (30) is fixedly connected to the bottom of the slide plate, a through groove is opened in the sintering furnace body (1) at a position corresponding to the slide plate, the slide plate is slidably connected in the through groove, a second bevel gear (31) is coaxially fixedly connected to the transmission shaft, the first bevel gear (29) and the second bevel gear (31) are meshed with each other, and two dust removal ports (32) are fixedly connected to the feed table (2), and the dust removal port (32) is connected to the booster cylinder (26) on the corresponding side; A material conveyor belt (11) is provided between the feed platform (2) and the discharge platform (3), the material conveyor belt (11) is located in the sintering furnace, and drive rollers are provided in both the feed platform (2) and the discharge platform (3), and the material conveyor belt (11) is sleeved on two drive rollers.

2. The energy-saving, uniform temperature open-type sintering furnace for the production of DCB copper-clad ceramic substrates according to claim 1 is characterized in that: The preheating detection mechanism comprises a notch formed on a side wall of one side of the sintering furnace chamber, a driving pulley (33) is coaxially fixedly connected to a driving roller of the material conveyor belt (11) close to the feeding table (2), a hexagonal frame (34) is rotatably connected in the notch, six ceramic substrates (35) are fixedly connected to the hexagonal frame (34), a driven bevel gear (36) is coaxially fixedly connected to one side of the hexagonal frame (34), a matching pulley (37) is rotatably connected in the sintering furnace body (1), a belt is sleeved between the driving pulley (33) and the matching pulley (37), a driving bevel gear (38) is coaxially fixedly connected to the matching pulley (37), and the driving bevel gear (38) and the driven bevel gear (36) are meshed with each other.

3. The energy-saving, uniform temperature open-type sintering furnace for the production of DCB copper-clad ceramic substrates according to claim 2 is characterized in that: A spring box (39) is fixedly connected to the top and bottom of the notch, two springs (40) are arranged in the spring box (39), two heat insulation boards (41) are slidably connected in the spring box (39), the heat insulation boards (41) are fitted with the ceramic substrate (35) on the corresponding side, and a temperature sensor (42) is arranged on the side wall of the notch, the temperature sensor (42) is fitted with the ceramic substrate (35) on the corresponding side.

4. The energy-saving, uniform temperature open sintering furnace for producing DCB copper-clad ceramic substrates according to claim 3 is characterized in that: A control box (43) is arranged on the top of the sintering furnace body (1), and a detection module and a control module are arranged in the control box (43), the control module is signal-connected to the detection module, the detection module is signal-connected to the temperature sensor (42), and the control module is signal-connected to the electromagnetic three-way regulating valve (8).

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