CN210387875U - High-efficient temperature control system in vacuum brazing furnace hot zone - Google Patents
High-efficient temperature control system in vacuum brazing furnace hot zone Download PDFInfo
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- CN210387875U CN210387875U CN201921074564.4U CN201921074564U CN210387875U CN 210387875 U CN210387875 U CN 210387875U CN 201921074564 U CN201921074564 U CN 201921074564U CN 210387875 U CN210387875 U CN 210387875U
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- heating
- brazing furnace
- vacuum brazing
- control system
- hot zone
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- 238000005219 brazing Methods 0.000 title claims abstract description 79
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims abstract description 93
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 47
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 2
- 239000011777 magnesium Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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Abstract
The utility model discloses a high-efficient temperature control system in vacuum brazing furnace hot zone is equipped with one in the central authorities of the inner wall of vacuum brazing furnace, or has a plurality of heating nickel strap layout structure at arbitrary inner wall even array. The heating nickel strap layout structure comprises a hot zone heating frame, a heating element frame, a reflecting screen and a nickel strap, wherein the reflecting screen and the heating element frame are arranged on the inner wall of the vacuum brazing furnace through the hot zone heating frame, and the nickel strap is fixed on the heating element frame in a winding manner. The heating nickel belt layout structures are mutually independent and are independently regulated and controlled through the temperature control system, so that the temperature of each space region in the vacuum brazing furnace can be accurately regulated and controlled, the hot zone of the vacuum brazing furnace is effectively heated, the temperature control is accurate, the uniformity of the temperature of the hot zone furnace is excellent, the magnesium vapor powder generated by brazing can be efficiently collected, the brazing quality is excellent, and meanwhile, the hot zone maintenance cost of the brazing furnace is greatly reduced.
Description
Technical Field
The utility model relates to a high-efficient temperature control system in vacuum brazing furnace hot zone for vacuum brazing field.
Background
The domestic vacuum aluminum brazing furnace manufacturer generally adopts a nickel-chromium alloy heating belt, the heating belt is generally distributed according to a U shape, industrial electric charges are directly loaded at two ends of the heating belt, and the temperature uniformity of a heating chamber is poor. The vacuum aluminum brazing furnace manufacturers of foreign brands basically adopt high-purity nickel strips to be matched with step-down transformers, the voltage at two ends of a nickel-based heating strip can be in a safe range due to the design, the damage to operation and maintenance personnel is avoided, the nickel-based heating strip basically adopts U-shaped layout, and the temperature uniformity cannot meet the brazing of high-precision aluminum fin type radiator workpieces. At present, the domestic automobile radiator brazing industry adopts a high-voltage heating belt, the heating belt is in a high-voltage working state, firstly, the system has the risk of endangering personal safety, and secondly, because the heating belt is in a U-shaped structural design, the hot zone temperature uniformity of a vacuum aluminum brazing furnace cannot meet the requirement of domestic users on high quality of brazed workpieces. Aluminum fin radiators used in the domestic aviation industry and direct-current voltage-regulating radiating units of high-speed rail motor cars put more severe technical index requirements on manufacturers producing the radiators. How to ensure the uniformity and stability of the space temperature in the vacuum brazing furnace is a major goal of the skilled person.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art, providing a high-efficient temperature control system for a hot zone of a vacuum brazing furnace, which can ensure that the temperature in the space in the vacuum brazing furnace is uniform and stable.
One technical scheme for achieving the above purpose is as follows: a high-efficiency temperature control system for a hot zone of a vacuum brazing furnace comprises the vacuum brazing furnace and a heating nickel strip layout structure arranged in the vacuum brazing furnace.
The inner wall of the vacuum brazing furnace is divided into six areas, namely a front wall, a rear wall, an upper wall, a lower wall, a left wall and a right wall, wherein one heating nickel strip layout structure is arranged in the center of any one area or a plurality of heating nickel strips are uniformly arrayed in any one area;
the heating nickel strip layout structure comprises a hot zone heating frame, a heating element frame, a reflecting screen and nickel strips, wherein the heating zone frame is arranged on the inner wall of the vacuum brazing furnace, the reflecting screen is fixed on the heating zone frame through split pins, a plurality of heating element frames are symmetrically arranged on four sides of the heating zone frame through the split pins and are connected with the reflecting screen, insulating rotating shafts are arranged at four corners of the heating frame, and the nickel strips are fixed on the heating element frame by respectively bypassing the insulating rotating shafts and the split pins.
Furthermore, a temperature control system is arranged in the vacuum brazing furnace corresponding to any one of the heating nickel strip layout structures, the temperature control system comprises a temperature detection element, a PID temperature closed-loop control system and a PLC control system which are sequentially connected, the temperature detection element collects temperature data of a heating area corresponding to the specific heating nickel strip layout structure in the vacuum brazing furnace, the temperature data is transmitted to the PID temperature closed-loop control system to perform proportional control calculation of differentiation and integration, then a calculation result is output to the PLC control system, and heating control is performed on a single heating nickel strip layout structure.
Still further, the temperature detection element is a thermocouple.
Furthermore, the vacuum brazing furnace also comprises a vacuum pumping system, and the vacuum pumping system is connected with the cavity of the vacuum brazing furnace.
Further, the vacuum air pumping system comprises a diffusion pump, a roots pump, a mechanical pump and a maintaining pump, wherein the roots pump and the mechanical pump form a vacuum pumping pump set, an air outlet of the vacuum brazing furnace is connected with the vacuum pumping pump set, the maintaining pump is connected to two ends of the vacuum pumping pump set, and the diffusion pump is connected to the air outlet of the vacuum brazing furnace.
The utility model discloses a high-efficient temperature control system in vacuum brazing furnace hot zone is equipped with one in the central authorities of the inner wall of vacuum brazing furnace, or has a plurality of heating nickel strap layout structure at arbitrary inner wall even array. The heating nickel strap layout structure comprises a hot zone heating frame, a heating element frame, a reflecting screen and a nickel strap, wherein the reflecting screen and the heating element frame are arranged on the inner wall of the vacuum brazing furnace through the hot zone heating frame, and the nickel strap is fixed on the heating element frame in a winding manner. The heating nickel belt layout structures are mutually independent and are independently regulated and controlled through the temperature control system, so that the temperature of each space region in the vacuum brazing furnace can be accurately regulated and controlled, the hot zone of the vacuum brazing furnace is effectively heated, the temperature control is accurate, the uniformity of the temperature of the hot zone furnace is excellent, the magnesium vapor powder generated by brazing can be efficiently collected, the brazing quality is excellent, and meanwhile, the hot zone maintenance cost of the brazing furnace is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the distribution of heating zones of a high-efficiency temperature control system for a hot zone of a vacuum brazing furnace according to the present invention;
FIG. 2 is a front view of a layout structure of a heating nickel strip of a high-efficiency temperature control system of a hot zone of a vacuum brazing furnace according to the present invention;
FIG. 3 is a side view of a layout structure of a heating nickel strip of a high-efficiency temperature control system of a hot zone of a vacuum brazing furnace according to the present invention;
FIG. 4 is a schematic view of a temperature control system of a high-efficiency temperature control system for a hot zone of a vacuum brazing furnace according to the present invention;
fig. 5 is a schematic view of a vacuum pumping system of the high-efficiency temperature control system for the hot zone of the vacuum brazing furnace of the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific embodiments and with reference to the accompanying drawings:
the utility model discloses a high-efficient temperature control system in vacuum brazing furnace hot zone, including vacuum brazing furnace 1, the heating nickel strap overall arrangement structure 2, temperature control system and the vacuum pumping system of setting in vacuum brazing furnace that takes the magnesium powder to collect the measure.
Referring to fig. 1, the inner wall of a vacuum brazing furnace 1 is divided into six regions, namely a front wall, a rear wall, an upper wall, a lower wall, a left wall and a right wall, and one heating nickel strip layout structure 2 is arranged in the center of any one region or a plurality of heating nickel strips are uniformly arrayed in any one region. In this embodiment, four heating nickel strap layout structures 2 are symmetrically arranged in four areas of the upper wall, the lower wall, the left wall and the right wall, and one heating nickel strap layout structure 2 is arranged in the center of each of the front wall and the rear wall.
Referring to fig. 2 and 3, the heating nickel strip layout structure 2 includes a hot zone heating frame 21, a heating element frame 22, a reflective screen 23 and a nickel strip 24. The heating zone frame 21 is arranged on the inner wall of the vacuum brazing furnace. The reflecting screen 23 is fixed on the heating area frame 21 through a cotter pin, the plurality of heating element frames 22 are symmetrically arranged on four sides of the heating area frame 21 through cotter pins and connected with the reflecting screen 23, in this embodiment, three heating element frames 22 are respectively arranged on the upper side and the lower side of the heating area frame 21, and two heating element frames 22 are respectively arranged on the left side and the right side of the heating area frame 21. Insulating winding shafts 25 are arranged at four corners of the heating frame, and the nickel strips 24 are fixed on the heating element frame 22 by respectively bypassing the insulating winding shafts 25 and the cotter pins. Any one heating nickel strip layout structure 2 forms a heating area which can be independently monitored and controlled, and the whole area of the vacuum brazing furnace is divided into a plurality of scattered areas to be independently controlled, so that the temperature uniformity in the cavity of the brazing furnace is realized.
Referring to fig. 4, a temperature control system is provided in the vacuum brazing furnace 1 corresponding to any one of the heating nickel strip layout structures 2. The temperature control system comprises a temperature detection element 31, a PID temperature closed-loop control system 32 (proportional-integral-derivative controller) and a PLC control system 33 which are connected in sequence. The temperature sensing element 31 is typically a thermocouple disposed within the vacuum brazing furnace chamber.
The PID temperature closed loop control system 32 (proportional-integral-derivative controller) is a common feedback loop component in industrial control applications, consisting of a proportional unit P, an integral unit I, and a derivative unit D. The basis of PID control is proportional control; integral control may eliminate steady state errors, but may increase overshoot; differential control can accelerate the response speed of the large inertia system and weaken the overshoot tendency.
The PLC control system 33 is an electronic device designed for industrial production for digital operation, which employs a programmable memory for storing programs therein, executing instructions for logic operation, sequence control, timing, counting, arithmetic operation, and the like, directed to users, and controls various types of machinery or production processes through digital or analog input/output. The utility model discloses well PLC control system 33 realizes the power control to specific heating nickel strap overall arrangement 2.
In the system, the temperature detection element 31 collects the temperature data of the heating area corresponding to the specific heating nickel strip layout structure 2 in the vacuum brazing furnace 1, the temperature data is transmitted to the PID temperature closed-loop control system 32 for linear relation calculation, then the calculation result is output to the PLC control system 33, and the power controller of the single heating nickel strip layout structure 2 is controlled so as to adjust the temperature. In the actual working process of the brazing furnace, the change curve of the time and the temperature does not show the optimal linear relation, the change curve can be timely fed back to the PLC control system 33 through the calculation of the PID temperature closed-loop control system 32, and the change curve is compared with a set value, so that the power controller of the heating nickel strip layout structure 2 is adjusted, and the ideal linear relation of the temperature control is obtained.
Please refer to fig. 5. The utility model discloses a high-efficient temperature control system in vacuum brazing furnace hot zone still includes vacuum pumping system, and vacuum brazing furnace's cavity is equipped with an exhaust duct outward, and vacuum pumping system is connected with this exhaust duct. The vacuum pumping system includes a diffusion pump 41, roots pump 42, mechanical pump 43, and maintenance pump 44. The roots pump 42 and the mechanical pump 43 form a vacuum pumping pump group, the air exhaust pipeline is connected with the vacuum pumping pump group, the maintaining pump 44 is connected with two ends of the vacuum pumping pump group, and the diffusion pump 41 is connected with the air outlet position of the air exhaust pipeline of the vacuum brazing furnace. The pumps are connected by high vacuum pipelines, each section of high vacuum pipeline is provided with a plurality of air pressure monitoring points, and the air pressure is monitored by a high vacuum gauge 45. A high vacuum gauge 45 is also arranged in the air exhaust pipeline and is used for monitoring the air pressure in the cavity of the vacuum brazing furnace and the range of the air exhaust pipeline. When the vacuum pumping system starts working, the roots pump 42 and the mechanical pump 43 are firstly opened, the vacuum pipeline is pumped, after each high vacuum gauge 45 of the air pressure monitoring point of the vacuum pipeline displays that the air pressure in the pipeline reaches a certain vacuum degree, the maintaining pump 4 is opened to continuously pump vacuum, so that the vacuum pipeline is maintained at a certain vacuum degree, the roots pump 42 and the mechanical pump 43 perform rough pumping on the brazing furnace cavity, so that the rough vacuum level in the brazing furnace cavity is reached, after the high vacuum gauge 45 in the pumping pipeline displays that the certain vacuum degree is reached, the diffusion pump 41 is opened to continuously pump the brazing furnace cavity to pump vacuum, and the required vacuum degree in the brazing furnace cavity is ensured.
In this embodiment, the utility model discloses a high-efficient temperature control system in vacuum brazing furnace hot zone will braze the stove cavity and divide into 4 regions about, divide into 4 regions from top to bottom, preceding furnace gate 1 is regional, back furnace gate 1 is regional, divide after for 10 heating regions with brazing the stove cavity internal becoming more meticulous, through installing the measurement of intelligent temperature-detecting element on every heating region, the real-time temperature feedback to control system of every heating region can be obtained, make the homogeneity of controlling the temperature in whole brazing stove cavity obtain guaranteeing, and can accomplish the temperature of monolithic heating region respectively, more saving energy consumption and time. After the vacuum brazing hot-zone efficient temperature control system is adopted, the temperature monitoring and control from the heating layout to the working process are realized, and the good working environment and the accurate temperature control are realized, so that the temperature uniformity in the vacuum brazing furnace cavity is realized, and the good production efficiency is realized.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a high-efficient temperature control system in vacuum brazing furnace hot zone, includes the vacuum brazing furnace to and set up the heating nickel strap layout structure in the vacuum brazing furnace, its characterized in that:
the inner wall of the vacuum brazing furnace is divided into six areas, namely a front wall, a rear wall, an upper wall, a lower wall, a left wall and a right wall, wherein one heating nickel strip layout structure is arranged in the center of any one area or a plurality of heating nickel strips are uniformly arrayed in any one area;
the heating nickel strip layout structure comprises a hot zone heating frame, a heating element frame, a reflecting screen and nickel strips, wherein the hot zone heating frame is arranged on the inner wall of the vacuum brazing furnace, the reflecting screen is fixed on the hot zone heating frame through a split pin, a plurality of heating element frames are symmetrically arranged on the four sides of the hot zone heating frame through the split pin and are connected with the reflecting screen, insulating rotating shafts are arranged at the four corners of the heating frame, and the nickel strips are fixed on the heating element frames by respectively bypassing the insulating rotating shafts and the split pin.
2. The system according to claim 1, wherein a temperature control system is provided in the vacuum brazing furnace corresponding to any one of the heating nickel strip layout structures, the temperature control system comprises a temperature detection element, a PID temperature closed-loop control system and a PLC control system which are connected in sequence, the temperature detection element collects temperature data of a heating region corresponding to a specific heating nickel strip layout structure in the vacuum brazing furnace, the temperature data is transmitted to the PID temperature closed-loop control system for proportional control calculation of differentiation and integration, and then the calculation result is output to the PLC control system for heating control of the single heating nickel strip layout structure.
3. The system of claim 2, wherein the temperature sensing element is a thermocouple.
4. The system of claim 1, further comprising a vacuum pumping system connected to the chamber of the vacuum brazing furnace.
5. The system as claimed in claim 4, wherein the vacuum brazing furnace hot zone efficient temperature control system comprises a diffusion pump, a roots pump, a mechanical pump and a maintenance pump, the roots pump and the mechanical pump form a vacuum pumping pump group, the vacuum brazing furnace air outlet is connected with the vacuum pumping pump group, the maintenance pump is connected with two ends of the vacuum pumping pump group, and the diffusion pump is connected with the vacuum brazing furnace air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074564.4U CN210387875U (en) | 2019-07-10 | 2019-07-10 | High-efficient temperature control system in vacuum brazing furnace hot zone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074564.4U CN210387875U (en) | 2019-07-10 | 2019-07-10 | High-efficient temperature control system in vacuum brazing furnace hot zone |
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| CN210387875U true CN210387875U (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153526A (en) * | 2019-07-10 | 2019-08-23 | 无锡应达工业有限公司 | A kind of vacuum brazing furnace hot-zone efficiently controlling temperature system |
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2019
- 2019-07-10 CN CN201921074564.4U patent/CN210387875U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153526A (en) * | 2019-07-10 | 2019-08-23 | 无锡应达工业有限公司 | A kind of vacuum brazing furnace hot-zone efficiently controlling temperature system |
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