A jewelry production acid boiling furnace
By using an electric heating furnace to simultaneously heat the acid bath from the side wall and bottom during the acid boiling process of gold jewelry, combined with the automatic adjustment of temperature sensors and controllers, the problems of high cost and low thermal efficiency of natural gas heating are solved, achieving a lower cost and more efficient acid boiling process.
Patent Information
- Application Number
- CN202521478483.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2026-06-12
- Estimated Expiration
- 2035-07-15
AI Technical Summary
Existing acid-boiling equipment for gold jewelry uses natural gas as a heat source, which has problems such as high heating costs, low thermal efficiency, and difficulty in temperature control.
An electric heating furnace is used as the heat source. Carbon fiber quartz heating tubes are installed on the side wall and bottom of the electric heating furnace to heat the acid tank from the bottom and side at the same time. Combined with temperature sensors and controllers, the heating power is automatically adjusted to ensure that the acid tank is kept within the acid boiling temperature range.
It reduces heating costs, improves heating efficiency, shortens acid boiling time, increases the heating area of the acid bath, and achieves faster heating speed and higher thermal efficiency.
Smart Images
Figure CN224350764U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of jewelry manufacturing technology, specifically to an acid-boiling furnace for jewelry production. Background Technology
[0002] The main purpose of acid boiling (or pickling) in the gold jewelry manufacturing process is to remove impurities and improve surface smoothness. It is used in jewelry production and the recycling of old jewelry. During acid boiling, the oxide layers formed during gold processing, such as copper oxide and silver oxide, are dissolved, restoring the original color of gold. Acid boiling also dissolves and removes impurities such as silver, copper, and zinc, increasing the purity of the jewelry. After acid boiling, the jewelry is rinsed with clean water. Nitric acid, hydrochloric acid, and aqua regia are commonly used in this process. Existing acid boiling equipment mainly uses natural gas as a heat source. The acid tank is heated on a gas stove, and the jewelry is placed in the acid solution once the boiling temperature is reached. After boiling, the jewelry is removed. The disadvantages of using natural gas as a heat source are: high heating costs; the gas stove can only heat the bottom area of the acid tank, resulting in a small heating area, low thermal efficiency, and increased heating time; and the heating temperature is difficult to control. Utility Model Content
[0003] This invention addresses the problems of high cost and low thermal efficiency when using natural gas as a heat source for acid boiling of gold jewelry by providing an electrically heated acid boiling furnace for jewelry production.
[0004] To solve the above-mentioned technical problems, the structural features of this utility model are as follows: it includes an electric heating furnace with an open top and a hollow interior; electric heating sources are respectively provided on the side walls and bottom of the electric heating furnace; an acid tank with an open top is provided inside the electric heating furnace, the top of the acid tank being higher than the top of the electric heating furnace; a temperature sensor for detecting the temperature inside the furnace is provided on the electric heating furnace; the electric heating sources are controlled and connected to a controller that can control the heating power of the electric heating sources; and the controller is signal-connected to the temperature sensor.
[0005] With the above structure, when acid-boiling jewelry, the acid solution is poured into the acid-boiling tank, and the electric heating sources on the side wall and bottom of the electric heating furnace are turned on to heat the acid tank simultaneously from the bottom and side, increasing the heating area and improving the heating efficiency of the acid solution. When the temperature reaches the acid-boiling temperature, the jewelry to be acid-boiled is placed into the acid tank for acid boiling. The working principle of the electric heating furnace is as follows: the electric heating furnace first heats the acid solution to the acid-boiling temperature at high power, and then switches to low power for heat preservation. The electric heating furnace is not turned off during the operation time. It switches between high and low power according to the temperature detected by the temperature sensor. When the temperature is lower than the acid-boiling temperature, high power heating is used, and after reaching the temperature, low power heat preservation is used to keep the acid solution within the acid-boiling temperature range. After acid boiling, the jewelry is taken out of the acid tank. The acid boiling furnace of this invention uses an electric heating source as the heat source for the acid tank, which is cheaper than natural gas fuel. The electric heating source heats the acid tank from the bottom and the side at the same time. Compared with the gas stove heating from the bottom, the electric heating furnace has a faster heating speed and higher heating efficiency. The acid in the acid tank heats up faster, thus saving the time required for acid boiling and improving efficiency.
[0006] The electric heating heat source is a carbon fiber quartz heating tube, which is installed on the side wall and bottom of the electric heating furnace.
[0007] The top opening of the electric heating furnace is equipped with an acid-resistant heat-insulating protective plate that is fitted over the outside of the acid tank to reduce heat loss from the furnace.
[0008] The acid tank is tightly fitted with an acid-proof sealing ring to prevent acid from entering the electric heating furnace. The acid-proof sealing ring is located above the acid-resistant heat-insulating protective plate.
[0009] The temperature sensor is located at the bottom of the electric heating furnace.
[0010] The bottom of the electric heating furnace is provided with a through-type pad, and the acid tank is placed on the pad.
[0011] The pad has multiple notches on its sidewall.
[0012] The acid tank is equipped with an openable and closable cover.
[0013] This utility model's acid boiling furnace uses a carbon fiber quartz heating tube as its heat source. The carbon fiber quartz heating tube is installed at the bottom and side walls of the furnace, simultaneously heating the acid tank from both sides. This increases the heating area and improves heating efficiency. Compared to gas stove heating, using an electric furnace as the heat source shortens the acid boiling time and reduces heat source costs. An acid-resistant heat-insulating plate reduces heat loss from the furnace, providing insulation. An acid-proof sealing ring prevents acid from boiling out and flowing into the furnace during boiling, providing protection. A support block is installed at the bottom of the furnace, supporting the acid tank. The block has a through-type structure, allowing the heat generated by the carbon fiber quartz heating tube to directly act on the bottom of the acid tank, reducing heat transfer obstruction. The notch in the block ensures that the temperature at the bottom and sides of the furnace remains as consistent as possible, making the temperature detected by the temperature sensor more accurate. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 for Figure 1 View from direction A;
[0016] Figure 3 for Figure 1 BB cross-sectional diagram;
[0017] Figure 4 for Figure 1 A schematic diagram of the CC cross-section;
[0018] Figure 5 for Figure 1 DD cross-sectional schematic diagram;
[0019] In the diagram: 1. Electric heating furnace; 11. Furnace bottom carbon fiber quartz heating tube; 12. Furnace wall carbon fiber quartz heating tube; 2. Acid tank; 21. Handle; 3. Cover plate; 4. Acid-resistant heat insulation plate; 5. Acid-proof sealing ring; 6. Temperature sensor; 7. Pad; 71. Notch. Detailed Implementation
[0020] Reference Figure 1-5A jewelry production acid-boiling furnace includes an acid tank 2 and an electric heating furnace 1 for heating the acid tank 2. The acid tank 2 is preferably a glass beaker, but enamel or other acid-resistant containers can also be used. The electric heating furnace 1 has an open top and a hollow interior. The acid tank 2 is placed into the electric heating furnace 1 through the open top. The acid and jewelry enter and exit through the open top of the acid tank 2. The top of the acid tank 2 is higher than the top of the electric heating furnace 1 for easy pouring of the acid and handling of the jewelry. The side walls of the electric heating furnace 1... Electric heating sources are provided at the bottom and sides of the furnace 1. These sources heat the acid bath 2 from the bottom and sides, increasing the heating area of the acid bath 2, improving heating efficiency, and shortening the time required for acid boiling of jewelry. Specifically, the side wall of the electric heating furnace 1 is equipped with a furnace wall carbon fiber quartz heating tube 12, and the bottom of the electric heating furnace 1 is equipped with a furnace bottom carbon fiber quartz heating tube 11. The service life of the carbon fiber quartz heating tubes can reach more than 5000 hours. The carbon fiber quartz heating tubes are coiled on the side wall and bottom of the electric heating furnace 1. The electric heating furnace 1 is equipped with a temperature sensor 6 for detecting the temperature inside the furnace. The temperature sensor 6 is connected to a controller (not shown in the figure) and transmits the detected temperature signal to the controller. Both the furnace bottom carbon fiber quartz heating tube 11 and the furnace wall carbon fiber quartz heating tube 12 are connected to the controller for control. The controller can control the heating power of the carbon fiber quartz heating tubes. Figure 1 As shown, a handle 21 is provided on the side wall of the acid tank 2. The handle 21 is located outside the electric heating furnace 1. A cover plate 3 that can be opened and closed is provided on the top of the acid tank 2. The cover plate 3 is opened when the acid is poured into the acid tank 2 and poured out of the acid tank 2, when the jewelry is placed into the acid tank 2 and taken out of the acid tank 2, and when the acid is heated and boiled. The cover plate 3 is closed during the acid heating process and the acid boiling process to reduce the volatilization and diffusion of acidic gas.
[0021] Reference Figure 1-3 The acid tank 2 is fitted with an acid-resistant heat-insulating plate 4, which is located on the top opening of the electric heating furnace 1. The acid-resistant heat-insulating plate 4 reduces heat loss from the furnace through the top opening, providing insulation. The plate 4 is made of high-temperature resistant materials, such as aluminum silicate fiber. An acid-resistant layer is provided on the upper surface of the plate 4 to prevent acid from splashing out of the acid tank 2 and causing corrosion. An acid-proof sealing ring 5 is tightly fitted around the acid tank 2 to prevent acid from splashing out. The sealing ring 5 is located above the acid-resistant heat-insulating plate 4. The acid-resistant sealing ring 5 can be made of materials such as polytetrafluoroethylene. Specifically, a groove can be set on the upper surface of the acid-resistant heat-insulating plate 4, and the acid-resistant sealing ring 5 can be tightly embedded in the groove. Alternatively, the groove can be omitted, and the acid-resistant sealing ring 5 can be tightly attached to the upper surface of the acid-resistant heat-insulating plate 4. The acid-resistant sealing ring 5 can prevent acid from entering the electric heating furnace 1 through the gap between the outer wall of the acid tank 2 and the acid-resistant heat-insulating plate 4 during the acid pouring process or acid boiling process.
[0022] Reference Figure 1, 4 5. Temperature sensor 6 is located at the center of the bottom of electric heating furnace 1. To ensure that the temperature inside the furnace detected by temperature sensor 6 is more accurate during the acid cooking process, a pad 7 is provided at the bottom of electric heating furnace 1 to support acid tank 2. Acid tank 2 is placed on pad 7. Pad 7 has a vertically continuous structure, meaning that pad 7 has no top or bottom and is continuous from top to bottom. The cross-section of pad 7 in the figure is cylindrical, but it can also be polygonal. The heat generated by carbon fiber quartz heating tube 11 at the bottom of the furnace can directly pass through pad 7 to heat the bottom of acid tank 2, reducing heat transfer loss. Multiple notches 71 are provided on the side wall of pad 7 to connect the space inside the electric heating furnace 1 and the bottom, making the temperature inside the furnace detected by temperature sensor 6 more accurate. Pad 7 can also adopt a structure of multiple vertical support plates radiating outward from the center.
[0023] Instructions for use: When acid-boiling jewelry, first place the acid tank 2 into the electric heating furnace 1. Seal the outside of the acid tank 2 with the acid-proof sealing ring 5 to prevent acid from flowing into the electric heating furnace 1. Open the cover 3 of the acid tank 2 and pour a certain amount of acid into it. Close the cover 3 and power on the carbon fiber quartz heating tube 11 at the bottom of the furnace and the carbon fiber quartz heating tube 12 on the furnace wall. Initially, high-power heating will be used to quickly raise the temperature inside the furnace (the temperature can reach over 1000℃). By increasing the temperature difference between the electric heating furnace 1 and the acid, the heating rate of the acid is accelerated, and the heating time is shortened. When the acid reaches the acid-boiling temperature, open the cover 3 and place the jewelry into the acid tank 2 for acid boiling. During acid boiling, a batch of jewelry is usually placed in a basket, and the entire basket is placed into the acid tank 2. The cover 3 is then closed to reduce the volatilization and diffusion of acidic gases. The controller controls the electric heating furnace 1 to enter the furnace. In the heat preservation mode, temperature sensor 6 transmits the furnace temperature signal to the controller. When the furnace temperature drops to a certain level, the controller controls the carbon fiber quartz heating tube 11 at the bottom of the furnace and the carbon fiber quartz heating tube 12 on the furnace wall to heat at high power. When the furnace temperature rises to a certain level, the controller controls the carbon fiber quartz heating tube 11 at the bottom of the furnace and the carbon fiber quartz heating tube 12 on the furnace wall to heat at low power, so that the acid solution is kept within the required temperature range for acid boiling. As for the starting temperature, time, and high / low temperature switching temperature, these parameters are determined based on experimental data. After obtaining the heating temperature, time, and other parameters, a program heating can be set to preheat the acid solution tank 5, further shortening the acid boiling time. The heating method can be low-temperature preheating followed by rapid heating. The appropriate heating method can be selected according to the actual situation. After the acid boiling is completed, the cover plate 3 is opened, the jewelry is taken out, and then washed and treated. The electric heating furnace 1 of this invention uses carbon fiber quartz heating tubes as a heat source, and the electricity cost is lower than that of natural gas. Compared with gas stove heating acid tank 2 from the bottom, the electric heating furnace 1 of this invention heats acid tank 2 from the bottom and the side at the same time. The heating area of acid tank 2 is increased, the thermal efficiency is improved, and the acid boiling time is shortened. Compared with natural gas heating, the acid boiling furnace of this invention can reach the acid equilibrium point in a shorter time.
[0024] This invention relates to an acid-boiling furnace that uses an electric heating furnace to heat an acid tank. The acid tank is located inside the electric heating furnace, which heats the acid tank simultaneously from the bottom and sides. Compared to a gas stove, which can only heat from the bottom, the electric heating furnace increases the heating area of the acid tank, improves thermal efficiency, and shortens the acid-boiling time. The carbon fiber quartz heating tube of the electric heating furnace uses electricity as its energy source, which is cheaper than natural gas. A temperature sensor is installed at the bottom of the electric heating furnace. The temperature sensor transmits the detected furnace temperature signal to the controller, which controls the heating power of the carbon fiber quartz heating tube based on the temperature signal. A pad is installed at the bottom of the electric heating furnace. The pad has a through-type structure, which has little impact on the heating efficiency of the carbon fiber quartz heating tube at the bottom of the furnace. The side wall of the pad has a notch, which connects the bottom and side spaces of the furnace, making the furnace temperature data detected by the temperature sensor more accurate.
Claims
1. A boiling acid furnace for jewelry production, characterized in that: The electric heating furnace (1) includes an open top and a hollow interior. The side walls and bottom of the electric heating furnace (1) are respectively provided with electric heating sources. An acid tank (2) with an open top is provided inside the electric heating furnace (1). The top of the acid tank (2) is higher than the top of the electric heating furnace (1). A temperature sensor (6) for detecting the temperature inside the furnace is provided on the electric heating furnace (1). The electric heating source is connected to a controller that can control the heating power of the electric heating source. The controller is connected to the temperature sensor (6) via signal.
2. The acid-boiling furnace for jewelry production according to claim 1, characterized in that: The electric heating source is a carbon fiber quartz heating tube, which is installed on the side wall and bottom of the electric heating furnace (1).
3. The acid-boiling furnace for jewelry production according to claim 1, characterized in that: The electric heating furnace (1) is provided with an acid-resistant heat-insulating protective plate (4) that is fitted outside the acid tank (2) to reduce the heat loss inside the furnace.
4. The acid-boiling furnace for jewelry production according to claim 3, characterized in that: The acid tank (2) is tightly fitted with an acid-proof sealing ring (5) to prevent the acid in the acid tank (2) from entering the electric heating furnace (1). The acid-proof sealing ring (5) is located above the acid-resistant heat insulation plate (4).
5. The acid-boiling furnace for jewelry production according to claim 1, characterized in that: The temperature sensor (6) is located at the bottom of the electric heating furnace (1).
6. The acid-boiling furnace for jewelry production according to claim 1, characterized in that: The bottom of the electric heating furnace (1) is provided with a through-type pad (7), and the acid tank (2) is placed on the pad (7).
7. The acid-boiling furnace for jewelry production according to claim 6, characterized in that: The pad (7) has multiple notches (71) on its side wall.
8. The acid-boiling furnace for jewelry production according to claim 1, characterized in that: The acid tank (2) is provided with an openable and closable cover plate (3) on top.