MIM sintering furnace with power failure protection function

Abstract

The MIM sintering furnace with the power failure protection function comprises a furnace body and a sintering frame, at least two sets of electric heating assemblies are evenly distributed in the furnace body on the outer side of the sintering frame, each set of electric heating assembly comprises a fixed base and a heating electrode, a heating shell is vertically installed on the top of the fixed base, and the heating electrode is arranged on the heating shell. The heating electrode is movably installed in the heating shell through a clamping assembly, a water cooling mechanism is arranged in the heating shell on the outer side of the heating electrode, a cold water tank is arranged on one side outside the furnace body, a water inlet pipeline communicated with the water cooling mechanism is arranged on the cold water tank, a water pump is installed on the water inlet pipeline, and a power failure switching assembly is arranged on the water pump. A water outlet pipe is arranged at the bottom of the heating shell, and the water outlet pipe is communicated with the cold water tank through a water return pipeline. The device realizes the power supply technology of automatic switching of the water cooling mechanism, can provide guarantee for continuous operation of the electric heating assembly, guarantees the use stability and safety of the electric heating assembly, and is remarkable in use effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder metallurgy injection molding process, and in particular relates to a MIM sintering furnace with a power failure protection function. Background Art

[0002] MIM sintering furnace is a heat treatment equipment that uses metal powder (or a mixture of metal powder and non-metal powder) as raw material to form metal or alloy parts through forming and sintering; it is mainly used for pressed iron-based, copper-based and other related powder metallurgy products. The type of sintering furnace is mainly electric furnace. Sintering electric furnaces are divided into two categories: resistance sintering furnaces and induction sintering furnaces. Resistance sintering furnaces are more commonly used. Resistance sintering furnaces are electric furnaces that convert electrical energy into heat energy through electric heating elements for sintering. According to the heating method, the resistance sintering furnace is divided into an indirect heating type resistance sintering furnace and a direct heating type resistance sintering furnace. The indirect heating type resistance sintering furnace refers to a type in which electric current passes through the electric heating element to emit heat, and the temperature of the furnace is increased by radiation heat transfer to heat the product; the direct heating type resistance sintering furnace refers to a type in which electric current flows directly from the power supply through the joint through the heated product to heat it. The existing direct heating type resistance sintering furnace has the following uncontrollable factors during use: First, due to the influence of external power, when the power system fails, the operating vacuum sintering furnace is directly powered off and shut down. The sudden stop of the electric heating element in the sintering furnace will cause the electric heating element to dry burn and be damaged, resulting in a reduction in the adaptability of the vacuum sintering furnace to the use environment, and there is no protection function after power failure; second, during the use of the electric heating component, when it is powered on, the temperature of the electric heating element gradually increases. If reasonable cooling measures are not adopted in time, the electric heating element will often burn out, and the replacement frequency of the electric heating element is relatively frequent. Therefore, it is an objective need to develop a MIM sintering furnace with a power outage protection function that has a reasonable structure, good cooling effect, and can maintain a stable temperature in the furnace even when a power outage occurs. Summary of the invention

[0003] The utility model aims to provide a MIM sintering furnace with a power failure protection function, which has a reasonable structure, good cooling effect and can keep the temperature in the furnace stable even when a power failure occurs.

[0004] The purpose of the utility model is achieved in this way, including a furnace body and a sintering rack movably placed in the furnace body, at least two groups of electric heating components are evenly arranged in the furnace body outside the sintering rack, each group of electric heating components includes a fixed base and a heating electrode, the fixed base is installed at the bottom of the furnace body, a heating shell is vertically installed on the top of the fixed base, the heating electrode is movably installed in the heating shell through a clamping assembly, the upper end of the heating electrode extends to the top of the heating shell, a water cooling mechanism is arranged in the heating shell outside the heating electrode, a cold water tank is arranged on one side outside the furnace body, a water inlet pipeline connected to the water cooling mechanism is arranged on the cold water tank, a water pump is installed on the water inlet pipeline, a power failure switching assembly is arranged on the water pump, a water supply pipe is arranged on the cold water tank, a water outlet pipe is arranged at the bottom of the heating shell, and the water outlet pipe is connected to the cold water tank through a return water pipe

[0005] Compared with the existing technology, the advantages of the device are: first, the device optimizes the structure of the electric heating component, and uses a water cooling mechanism to cool the heating electrode to avoid the situation where the heating electrode is burned out due to excessive temperature of the heating electrode, which can ensure the production of the heating electrode, effectively extend the service life of the heating electrode, reduce the replacement frequency of the heating electrode, and thus reduce the production cost, and the water cooling mechanism structure design is relatively reasonable, and can have a good cooling effect during use; second, the device is provided with a power outage switching component on the water inlet pipeline, and the power outage switching component can provide backup power for the operation of the water cooling mechanism. When the power supply of the power grid line fails, the power outage switching component can use the backup power to provide power to the water cooling mechanism, solve the problem of the water cooling mechanism not being able to supply water normally due to sudden power outages and other emergencies, prevent the heating electrode from drying out, and ensure the stability of the sintering temperature in the furnace. The device realizes the power supply technology of automatic switching of the water cooling mechanism, which can provide guarantee for the continuous operation of the electric heating component, ensure the stability and safety of the use of the electric heating component, and has significant use effect, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a main schematic diagram of the utility model;

[0007] Figure 2 This is a front view of the electric heating component in the utility model;

[0008] Figure 3 It is a top view of the electric heating component in the utility model;

[0009] In the figure: 1-furnace body, 2-sintering rack, 3-fixed base, 4-heating electrode, 5-heating shell, 6-cold water tank, 61-water supply pipe, 7-water inlet pipeline, 8-water pump, 9-water outlet pipe, 91-return water pipeline, 10-generator, 11-municipal power supply line, 12-power conversion switch, 13-vertical pipe, 14-positioning inner shell, 15-clamping block, 16-fixed sleeve, 17-positioning rod, 18-telescopic spring, 19-acid supply port, 20-sponge filter layer. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention belong to the protection scope of the present invention.

[0011] like Figures 1 to 3 As shown, the utility model comprises a furnace body 1 and a sintering rack 2 movably placed in the furnace body 1. At least two groups of electric heating components are evenly arranged in the furnace body 1 outside the sintering rack 2. Each group of electric heating components comprises a fixed base 3 and a heating electrode 4. The heating electrode 4 is a prior art. The heating electrode 4 is directly purchased as a finished product according to the requirements of the heating power. The fixed base 3 is installed at the bottom of the furnace body 1. A heating shell 5 is vertically installed on the top of the fixed base 3. The heating electrode 4 is movably installed in the heating shell 5 through a clamping assembly. The upper end of the heating electrode 4 extends to the top of the heating shell 5, and a water cooling mechanism is arranged in the heating shell 5 outside the heating electrode 4. A cold water tank 6 is arranged on one side outside the furnace body 1, and a water inlet pipeline 7 connected to the water cooling mechanism is arranged on the cold water tank 6. A water pump 8 is installed on the water inlet pipeline 7, and a power failure switching component is arranged on the water pump 8. A water replenishment pipe 61 is arranged on the cold water tank 6, and a water outlet pipe 9 is arranged at the bottom of the heating shell 5, and the water outlet pipe 9 is connected with the cold water tank 6 through a return water pipe 91.

[0012] When the device is in use, first put the sintering rack 2 with the MIM product into the furnace body 1, then energize the heating electrode 4, and directly heat the furnace body 1 after the heating electrode 4 is energized. During the heating process, if it is monitored that the temperature of the heating electrode 4 is too high, it needs to be cooled down to prevent it from being burned out due to excessive temperature. At this time, turn on the water pump 5. Under the action of the water pump 5, the cold water in the cold water tank 6 enters the water cooling mechanism through the water inlet pipe 7. The water cooling mechanism is used to cool down the heating electrode 4 to avoid the heating electrode being burned out due to excessive temperature of the heating electrode 4. The production work of the heating electrode 4 can be guaranteed, the service life of the heating electrode 4 can be effectively extended, the replacement frequency of the heating electrode 4 can be reduced, and the production cost can be reduced. The cooled cold water flows back to the cold water tank 6 through the return pipe 91 for self-cooling. Natural cooling. Since the water cooling mechanism is intermittently operated, it can be recycled after naturally cooling after flowing back into the cold water tank 6 through the return water pipe 91. In order to prevent the water pump 8 from suddenly losing power during operation, causing the water cooling mechanism to be unable to operate normally, a power outage switching component is set on the water pump 8. The power outage switching component can provide backup power for the operation of the water cooling mechanism. When the power supply of the power grid line fails, the power outage switching component can use the backup power to provide power to the water cooling mechanism, solve the problem of insufficient water supply to the water cooling mechanism caused by sudden power outages and other emergencies, prevent the heating electrode 4 from drying out, and ensure the sintering temperature in the furnace is stable. The device realizes the power supply technology of automatic switching of the water cooling mechanism, which can provide guarantee for the continuous operation of the electric heating component, ensure the stability and safety of the use of the electric heating component, and the use effect is remarkable.

[0013] Furthermore, the power outage switching component includes a generator 10, a municipal power supply line 11 and a power conversion switch 12. The generator 10 is a structure used in the prior art, preferably a diesel generator. The power conversion switch 12 is a handle interlocking rotary switch used in the prior art. The power conversion switch 12 is used to switch and select so that the generator 10 or the municipal power supply line 11 can supply power to the water pump 8. The power output end of the municipal power supply line 11 is connected to the municipal power input interface of the power conversion switch 12, the power output end of the generator 10 is connected to the input power supply inlet of the power conversion switch 12, and the output end of the power conversion switch 12 is connected to the power supply inlet of the water pump 8. The method of use is as follows: when the municipal power supply line 11 is supplying power normally, the power supply of the water pump 8 is connected to the power output end of the municipal power supply line 11 to maintain the normal power supply of the water pump 8; when an emergency such as a power outage occurs, the power supply of the water pump 8 is automatically disconnected from the power output end of the municipal power supply line 11 through the control of the power conversion switch 12, and is connected to the power supply of the generator 10 to ensure that when the municipal power supply line 11 is suddenly powered off, the water pump 8 can also be powered normally, thereby ensuring normal water supply to the water cooling mechanism. During use, the power supply of the heating electrode 4 can also be connected to the power conversion switch 12, and the power conversion switch 12 can be used to achieve normal power supply to the heating electrode 4 when there is a sudden power outage.

[0014] Furthermore, in order to achieve a better cooling effect, the water cooling mechanism includes 2 to 3 vertical tubes 13 evenly distributed on the outside of the heating electrode 4, and a plurality of cooling nozzles are installed at equal intervals along the axial direction of the vertical tube 13 close to the side of the heating electrode 4. The upper end of the vertical tube 13 is sealed, and the lower end of the vertical tube 13 is connected to the water inlet pipe 7. When in use, the cold water in the cold water tank 6 enters each vertical tube 13 through the water inlet pipe 7, and then is sprayed to the heating electrode 4 through the cooling nozzle, which can achieve a better cooling effect.

[0015] Furthermore, in order to facilitate the installation or replacement of the heating electrode, the clamping assembly includes a positioning inner shell 14 and a clamping block 15. A plurality of groups of elastic members are installed at equal intervals on the inner wall of the heating outer shell 5. The positioning inner shell 14 is installed on the elastic member. The clamping block 15 is multiple, and the multiple clamping blocks 15 are evenly installed in the upper and lower parts of the positioning inner shell 14. The ends of the clamping blocks 15 are processed with clamping grooves that are compatible with the heating electrode 4. The upper and lower parts of the heating electrode 4 are clamped by the clamping blocks 15, which can not only clamp and fix the heating electrode 4, but also prevent the heating electrode 4 from bursting due to high temperature during heating. Preferably, the elastic member includes a fixing sleeve 16, a positioning rod 17 and a telescopic spring 18. The fixing sleeve 16 is installed It is installed on the inner wall of the heating outer shell 5, and the positioning rod 17 is installed on the outer wall of the positioning inner shell 14. The end of the positioning rod 17 is movably inserted in the fixing sleeve 16. The telescopic spring 18 is sleeved on the outside of the positioning rod 17, and one end of the telescopic spring 18 is fixedly connected to the outer wall of the positioning inner shell 14, and the other end is fixedly connected to the end of the fixing sleeve 16. When the heating electrode 4 needs to be installed, it is only necessary to press the positioning inner shell 14 toward one side of the heating outer shell 5, insert the heating electrode 4 into the positioning inner shell 14, the telescopic spring 18 stretches, and the clamping block 15 will clamp and fix the heating electrode 4. Conversely, when the heating electrode 4 needs to be disassembled, the heating inner shell 14 is pressed toward one side of the heating outer shell 5, the telescopic spring 18 is compressed, and the heating electrode 4 can be taken out from the positioning inner shell 14.

[0016] Furthermore, the cold water tank 6 is provided with an acid replenishing port 19. When the heating electrode 4 is working, the water cooling mechanism of the heating electrode 4 needs to be regularly descaled. Dilute hydrochloric acid has the multi-purpose of descale. Dilute hydrochloric acid is added into the cold water tank 6 via the acid replenishing port 19, and the water cooling mechanism is replenished with acid via the water inlet pipe 7, so as to clean the water cooling mechanism from dirt.

[0017] Furthermore, a sponge filter layer 20 is provided at the water inlet of the water inlet pipe 7. The sponge filter layer 20 can be used to filter the cold water entering the water inlet pipe 7 to prevent the pipe of the water cooling mechanism from being blocked.

Claims

1. A MIM sintering furnace with a power failure protection function, comprising a furnace body (1) and a sintering rack (2) movably placed in the furnace body (1), characterized in that: At least two groups of electric heating components are evenly arranged in the furnace body (1) outside the sintering rack (2), and each group of electric heating components includes a fixed base (3) and a heating electrode (4). The fixed base (3) is installed at the bottom of the furnace body (1), and a heating shell (5) is vertically installed on the top of the fixed base (3). The heating electrode (4) is movably installed in the heating shell (5) through a clamping component. The upper end of the heating electrode (4) extends above the heating shell (5). A water cooling mechanism is provided in the shell (5); a cold water tank (6) is provided on one side outside the furnace body (1); a water inlet pipe (7) connected to the water cooling mechanism is provided on the cold water tank (6); a water pump (8) is installed on the water inlet pipe (7); a power failure switching component is provided on the water pump (8); a water supply pipe (61) is provided on the cold water tank (6); a water outlet pipe (9) is provided at the bottom of the heating shell (5); and the water outlet pipe (9) is connected to the cold water tank (6) via a return water pipe (91).

2. The MIM sintering furnace with power failure protection function according to claim 1, characterized in that: The power failure switching component comprises a generator (10), a municipal power supply line (11) and a power conversion switch (12), wherein the power output end of the municipal power supply line (11) is connected to the municipal power input interface of the power conversion switch (12), the power output end of the generator (10) is connected to the input power inlet of the power conversion switch (12), and the output end of the power conversion switch (12) is connected to the power supply interface of the water pump (8).

3. The MIM sintering furnace with power failure protection function according to claim 2, characterized in that: The generator (10) is a diesel generator.

4. The MIM sintering furnace with power failure protection function according to claim 1, characterized in that: The water cooling mechanism comprises 2 to 3 vertical tubes (13) evenly distributed on the outside of the heating electrode (4); a plurality of cooling nozzles are installed at equal intervals along the axial direction of the vertical tube (13) on the side close to the heating electrode (4); the upper end of the vertical tube (13) is sealed, and the lower end of the vertical tube (13) is connected to the water inlet pipeline (7).

5. The MIM sintering furnace with power failure protection function according to claim 1, characterized in that: The clamping assembly comprises a positioning inner shell (14) and a clamping block (15); a plurality of groups of elastic members are installed at equal intervals on the inner wall of the heating outer shell (5); the positioning inner shell (14) is installed on the elastic members; the clamping block (15) is a plurality of blocks; the plurality of clamping blocks (15) are evenly installed at the upper and lower parts of the positioning inner shell (14); and the ends of the clamping blocks (15) are machined with clamping grooves that are compatible with the heating electrodes (4).

6. The MIM sintering furnace with power failure protection function according to claim 5, characterized in that: The elastic member comprises a fixing sleeve (16), a positioning rod (17) and a telescopic spring (18); the fixing sleeve (16) is mounted on the inner wall of the heating outer shell (5); the positioning rod (17) is mounted on the outer wall of the positioning inner shell (14); the end of the positioning rod (17) is movably inserted into the fixing sleeve (16); the telescopic spring (18) is sleeved on the outer side of the positioning rod (17); one end of the telescopic spring (18) is fixedly connected to the outer wall of the positioning inner shell (14); and the other end is fixedly connected to the end of the fixing sleeve (16).

7. The MIM sintering furnace with power failure protection function according to claim 1, characterized in that: The cold water tank (6) is provided with an acid replenishing port (19).

8. The MIM sintering furnace with power failure protection function according to claim 1, characterized in that: A sponge filter layer (20) is provided at the water inlet of the water inlet pipeline (7).

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