Muffle furnace for loss on ignition detection and loss on ignition detection method

Abstract

The present invention discloses a muffle furnace for detecting loss on ignition and a method for detecting loss on ignition, which relates to the field of muffle furnace for detecting loss on ignition and a method for detecting loss on ignition, including a muffle furnace body, two crucible lifting mechanisms, a mass difference transmission mechanism and a mass difference detection mechanism, wherein the crucible lifting mechanism includes a lifting assembly, the lifting assembly can be lifted, one end of the mass difference transmission mechanism is rotatably mounted with an active turntable, both sides of the outer wall of the active turntable are symmetrically fixed with long rods, the long rods are slidably connected with the corresponding lifting assembly, the other end of the mass difference transmission mechanism is rotatably mounted with a driven turntable, the driven turntable can be deflected synchronously with the active turntable, and the mass difference detection mechanism can detect the deflection force of the driven turntable. Through the above-mentioned structural arrangement, the present invention can obtain loss on ignition data that eliminates the interference of the crucible's own weight change, thereby improving the accuracy of loss on ignition detection.

Description

Technical Field

[0001] The invention relates to the field of loss on ignition detection, and in particular to a muffle furnace for loss on ignition detection and a loss on ignition detection method. Background Art

[0002] Loss on ignition refers to the mass lost by the volatilization or decomposition of moisture, volatile substances or other components in a sample during heating under certain temperature conditions, as a percentage of the original sample mass. The determination of loss on ignition usually involves heating the sample at high temperature for a certain period of time to release moisture, volatile substances or other components in the sample such as inherent water, sulfur dioxide, carbon dioxide, etc., thereby measuring the loss of mass. The measurement of loss on ignition can be used to evaluate the purity, refractory properties, mineral composition, and stability of the sample under specific high temperature conditions.

[0003] In the prior art, the method for detecting the loss on ignition is generally to weigh 1.0000-2.0000g of a pre-dried sample and pour it into an empty crucible of known constant mass, place the crucible in a high-temperature electric furnace, burn it from low temperature until it is kept at 950°C for 1 hour, take it out and cool it slightly, put it in a dryer for 20min-30min, and then weigh the carbon mass, and then put it in a high-temperature electric furnace at 950°C for 30min, and weigh the carbon mass after cooling until the difference between the two masses does not exceed 0.5mg, that is, it reaches a constant mass, and compare it with the original sample mass to obtain the loss on ignition. However, the muffle furnace used in the above process does not have a weighing function, and it is impossible to obtain the continuous dynamic weight change of the sample during the burning process. The stability and reliability of the value of the loss on ignition of the sample determined by the above loss on ignition method are difficult to guarantee. Some muffle furnaces with weighing functions on the market have solved the technical problem that it is impossible to obtain continuous dynamic weight change values ​​of samples during the burning process. However, the net weight of the sample needs to be obtained by subtracting the weight of the muffle furnace. Since the materials used for the muffle furnace are mainly steel shell and internal refractory materials, the steel and refractory materials will produce oxidation and the refractory materials will have a burning index in a continuous high temperature environment. Therefore, the weight of the muffle furnace decreases with the extension of the use time. Therefore, the weight of the muffle furnace is used as the net weight, and there are many error factors and large errors in the determination of the loss on ignition of forest soil.

[0004] Therefore, the present application provides a muffle furnace for loss on ignition detection and a loss on ignition detection method to meet the needs. Summary of the invention

[0005] The purpose of the present application is to provide a muffle furnace for detecting loss on ignition. Two lifting assemblies are arranged, and the lifting assemblies can place and lift crucibles and materials. An active turntable is rotatably installed at one end of a mass difference transmission mechanism, and long rods are symmetrically fixedly installed on both sides of the outer wall of the active turntable, and the long rods are slidably connected to the corresponding lifting assemblies. A crucible filled with materials is placed on one lifting assembly, and an empty crucible is placed on the other lifting assembly. The masses of the two lifting assemblies are different, and the active turntable is driven to deflect by the long rods. A driven turntable is arranged at the other end of the mass difference transmission mechanism, and the driven turntable deflects synchronously with the active turntable. The force of the deflection of the driven turntable acts on the mass difference detection mechanism. Different deflection forces are detected by the mass difference detection mechanism, thereby feeding back the mass difference on the two lifting assemblies, that is, the mass of the pure material. By comparing the data before and after the material and the crucible are burned, the loss on ignition data excluding the interference of the crucible's own weight change can be obtained, thereby improving the accuracy of the loss on ignition detection.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a muffle furnace for detecting loss on ignition, comprising a muffle furnace body, and also comprising two crucible lifting mechanisms, a mass difference conduction mechanism and a mass difference detection mechanism, wherein one end of the mass difference conduction mechanism passes through the top of the muffle furnace body to the inside thereof, the crucible lifting mechanism is arranged inside the muffle furnace body, and the two crucible lifting mechanisms are symmetrically arranged on both sides of the mass difference conduction mechanism; the crucible lifting mechanism comprises a lifting assembly, the lifting assembly can detect the weight of the crucible and the material, and the lifting assembly can be lifted and lowered, an active turntable is rotatably installed on one end of the mass difference conduction mechanism, long rods are symmetrically fixedly installed on both sides of the outer wall of the active turntable, and the long rods are slidably connected to the corresponding lifting assemblies, a driven turntable is rotatably installed on the other end of the mass difference conduction mechanism, the driven turntable can be deflected synchronously with the active turntable, and the mass difference detection mechanism can detect the deflection force of the driven turntable.

[0007] Preferably, the lifting assembly includes a lifting frame and a crucible bracket, the outer wall of the lifting frame is fixedly installed with a plurality of connecting blocks, the outer wall of the crucible bracket is fixedly installed with a plurality of protrusions, the bottom ends of the protrusions are fixedly installed with limiting columns, each of the limiting columns is inserted through the corresponding connecting blocks, the bottom of the lifting frame is fixedly installed with a heat insulation box, an electronic scale is fixedly installed in the heat insulation box, the detection end of the electronic scale is inserted through the heat insulation box and the lifting frame, and the bottom of the crucible bracket is fixedly installed with a protrusion, and the protrusion is in contact with the detection end of the electronic scale.

[0008] Preferably, the crucible lifting mechanism also includes a base, which is fixedly installed inside the muffle furnace body, and a plurality of guide rods are fixedly installed on the top of the base, each of the guide rods is inserted through a corresponding connecting block, and the connecting block is slidably connected to the corresponding guide rod, and a limit block is provided at one end of the guide rod.

[0009] Preferably, the mass difference transmission mechanism also includes a fixed box, a driving gear, a driven gear and a gear belt. The fixed box is inserted through the muffle furnace body, and a cavity is opened inside the fixed box. The driving turntable is installed on one end of the fixed box through a first rotating shaft, and the driven turntable is installed on the other end of the fixed box through a second rotating shaft. The driving gear, the driven gear and the gear belt are all arranged in the cavity. The first rotating shaft is inserted through the driving gear and is fixedly connected to the driving gear, the second rotating shaft is inserted through the driven gear and is fixedly connected to the driven gear, and the gear belt is sleeved on the outside of the driving gear and the driven gear, and the driving gear and the driven gear are both meshed and connected with the gear belt.

[0010] Preferably, a strip groove is formed at one end of the long rod, a connecting column is fixedly mounted at one end of the heat insulation box, the connecting column passes through the strip groove, and the width of the strip groove is equal to the diameter of the connecting column.

[0011] Preferably, the quality difference detection mechanism includes a shell and a tensile scale, the shell is fixedly installed on the top of the muffle furnace body, the tensile scale is fixedly installed inside the shell, the detection end of the tensile scale is fixedly connected with a connecting rope, and the connecting rope passes through the bottom of the shell and is fixedly connected to the outer wall of the driven turntable.

[0012] Preferably, two steering wheels are rotatably mounted on the inner wall of the shell, the two steering wheels are symmetrically arranged on both sides of the extension line of the tensile scale detection end, and the two steering wheels are tangent to the extension line of the tensile scale detection end.

[0013] Preferably, an observation port is provided on the front side of the housing, and the position of the tensile scale display screen corresponds to the position of the observation port.

[0014] Preferably, a first rope groove is formed on the outer wall of the driven turntable, and a second rope groove is formed on the outer wall of the steering wheel, the cross-sections of the first rope groove and the second rope groove are both semicircular, and the diameters of the cross-sections of the first rope groove and the second rope groove are the same as the diameter of the cross-section of the connecting rope.

[0015] The present invention also discloses a method for detecting loss on ignition using the above-mentioned muffle furnace for detecting loss on ignition, the method comprising the following steps:

[0016] Step 1: Select two identical crucibles and place them on two crucible holders respectively. Start the muffle furnace and burn them from low temperature until they reach 950℃ and keep it for 1 hour. Use a tension scale to read the mass difference between the two crucibles. If the mass difference between the two crucibles is always less than 0.5 mg, proceed to the next step.

[0017] Step 2: Close the muffle furnace body, wait for the furnace to cool down, weigh 1.0000-2.0000g of the pre-dried material and pour it into one of the crucibles, start the muffle furnace body again, burn from low temperature until 950℃ and keep it for 1h, close the muffle furnace body, wait for the furnace to cool down for 20min-30min, start the muffle furnace body again, raise the temperature in the furnace to 950℃ and keep it for 30min, close the muffle furnace body again, wait for the furnace to cool down, and read the weight of the material through the tension scale all the time during the process until it is observed that the weight of the material fluctuates for a long time without exceeding 0.5mg. The data read by the tension scale is the mass of the material after burning, which is compared with the initial mass of the material to obtain the loss on ignition;

[0018] Step 3: After the furnace has completely cooled down, take out the electronic scale from the insulation box and observe the changes in the total mass of the crucible and the material recorded on the electronic scale. Use this as reference data to compare with the changes in the material mass detected by the tension scale to verify the accuracy of the loss on ignition.

[0019] In summary, the technical effects and advantages of the present invention are as follows:

[0020] 1. In the present invention, two lifting assemblies are provided, and the lifting assemblies can place and lift the crucible and the material. An active turntable is rotatably installed at one end of the mass difference transmission mechanism, and long rods are symmetrically fixedly installed on both sides of the outer wall of the active turntable, and the long rods are slidably connected with the corresponding lifting assemblies. A crucible loaded with material is placed on one lifting assembly, and an empty crucible is placed on the other lifting assembly. The masses of the two lifting assemblies are different, and the active turntable is driven to deflect by the long rods. A driven turntable is provided at the other end of the mass difference transmission mechanism, and the driven turntable deflects synchronously with the active turntable. The force of the deflection of the driven turntable acts on the mass difference detection mechanism, and different deflection forces are detected by the mass difference detection mechanism, thereby feeding back the mass difference on the two lifting assemblies, that is, the mass of the pure material. By comparing the data before and after the material and the crucible are burned, the data of the loss on ignition excluding the interference of the crucible's own weight change can be obtained, thereby improving the accuracy of the loss on ignition detection.

[0021] 2. In the present invention, a heat-insulating box is installed at the bottom of the lifting frame, an electronic scale is installed in the heat-insulating box, the detection end of the electronic scale passes through the heat-insulating box and the lifting frame, a convex column is fixedly installed at the bottom of the crucible bracket, the convex column is in contact with the detection end of the electronic scale, and the electronic scale can detect the total mass of the crucible and the material. Through the real-time data of the electronic scale, the continuous dynamic weight change during the burning process of the material can be obtained conveniently, and compared with the loss on ignition data obtained by the quality difference detection mechanism, it is convenient to obtain more accurate loss on ignition detection data.

[0022] 3. In the present invention, a mass difference transmission mechanism is provided, the mass difference transmission mechanism includes a driving turntable, a driven turntable, a fixed box, a driving gear, a driven gear and a gear belt, the driving turntable is installed on one end of the fixed box through a first rotating shaft, the driven turntable is installed on the other end of the fixed box through a second rotating shaft, the driving gear is installed on the first rotating shaft, the driven gear is installed on the second rotating shaft, the driving gear and the driven gear are connected through a gear belt, so that when the driving turntable rotates, the driven turntable is driven to rotate through the transmission of the driving gear, the driven gear and the gear belt, thereby transmitting the deflection force of the weight of the reaction material to the outside of the muffle furnace body, so that the mass difference detection mechanism can be provided outside the muffle furnace body, avoiding the influence of high temperature on its measurement accuracy, and improving the accuracy of loss on ignition detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the mass difference transmission mechanism of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the crucible lifting mechanism of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the crucible lifting mechanism of the present invention from another angle;

[0028] Figure 5 It is a schematic diagram of the connection structure between the lifting frame and the crucible bracket of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-section structure of the mass difference transmission mechanism of the present invention;

[0030] Figure 7 It is a schematic diagram of the connection structure between the quality difference transmission mechanism and the quality difference detection mechanism of the present invention;

[0031] Figure 8 For the present invention Figure 7 The enlarged structural diagram at A in the middle;

[0032] Fig. 9 It is a disassembled diagram of the poor quality detection mechanism of the present invention.

[0033] In the figure: 1. muffle furnace body; 2. crucible lifting mechanism; 201. base; 202. guide rod; 203. lifting frame; 204. crucible bracket; 205. connecting block; 206. insulation box; 207. electronic scale; 208. convex block; 209. limit column; 210. convex column; 211. connecting column; 3. quality difference transmission mechanism; 301. active turntable; 302. long rod; 303. driven turntable; 304. fixing box; 305. active gear; 306. driven gear; 307. gear belt; 308. strip groove; 4. quality difference detection mechanism; 401. shell; 402. tension scale; 403. observation port; 404. connecting rope; 405. steering wheel. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example: Reference Figure 1 , Figure 2A muffle furnace for detecting loss on ignition and a method for detecting loss on ignition are shown, comprising a muffle furnace body 1, two crucible lifting mechanisms 2, a mass difference conduction mechanism 3 and a mass difference detection mechanism 4, one end of the mass difference conduction mechanism 3 passes through the top of the muffle furnace body 1 to the inside thereof, the crucible lifting mechanism 2 is arranged inside the muffle furnace body 1, and the two crucible lifting mechanisms 2 are symmetrically arranged on both sides of the mass difference conduction mechanism 3; the crucible lifting mechanism 2 includes a lifting component, and the lifting component can detect the weight of the crucible and the material, obtain the total weight of the crucible and the material before and after the material is burned, and obtain the loss on ignition data of the material without excluding the change of the crucible's own weight. The lifting assembly can be lifted and lowered, an active turntable 301 is rotatably mounted on one end of the mass difference transmission mechanism 3, long rods 302 are symmetrically fixedly mounted on both sides of the outer wall of the active turntable 301, and the long rods 302 are slidably connected with the corresponding lifting assembly, and a driven turntable 303 is rotatably mounted on the other end of the mass difference transmission mechanism 3, and the driven turntable 303 can be deflected synchronously with the active turntable 301, and the mass difference detection mechanism 4 can detect the deflection force of the driven turntable 303, and a lifting assembly is placed with an object. The active turntable 301 is deflected by the long rod 302, and the driven turntable 303 deflects synchronously with the active turntable 301. The force of the deflection of the driven turntable 303 acts on the quality difference detection mechanism 4, and the different deflection forces are detected by the quality difference detection mechanism 4, so as to feed back the quality difference between the two lifting assemblies, that is, the quality of the pure material. By comparing the data before and after the burning of the material and the crucible, the data of the loss on ignition without the interference of the crucible's own weight change can be obtained.

[0036] Furthermore, if Figure 3-Figure 5 As shown, the lifting assembly includes a lifting frame 203 and a crucible bracket 204, the outer wall of the lifting frame 203 is fixedly installed with a plurality of connecting blocks 205, the outer wall of the crucible bracket 204 is fixedly installed with a plurality of protrusions 208, the bottom end of the protrusion 208 is fixedly installed with a limiting column 209, each of the limiting columns 209 passes through the corresponding connecting block 205, and the limiting columns 209 act on the connecting block 205 to prevent the crucible bracket 204 from tilting. The bottom of the lifting frame 203 is fixedly installed with a heat insulation box 20 6. An electronic scale 207 is fixedly installed in the insulation box 206, and the detection end of the electronic scale 207 passes through the insulation box 206 and the lifting frame 203. A convex column 210 is fixedly installed on the bottom of the crucible bracket 204, and the convex column 210 is in contact with the detection end of the electronic scale 207. The electronic scale 207 removes the dead weight of the crucible bracket 204 and is used to detect the total weight of the crucible and the material in real time, so as to obtain continuous dynamic weight changes during the burning process of the material and obtain more accurate loss on ignition detection data.

[0037] Furthermore, the crucible lifting mechanism 2 also includes a base 201, which is fixedly installed inside the muffle furnace body 1, and a plurality of guide rods 202 are fixedly installed on the top of the base 201, each of the guide rods 202 passes through a corresponding connecting block 205, and the connecting block 205 is slidably connected to the corresponding guide rod 202, and a limit block is provided at one end of the guide rod 202 to ensure that the lifting frame 203 can be lifted and lowered along the guide rod 202. When there is a difference in the total weight of the crucibles and materials placed on the two crucible brackets 204, the side with a larger weight will move downward, and the side with a smaller weight will move upward.

[0038] Furthermore, if Figure 6 As shown, the mass difference transmission mechanism 3 also includes a fixed box 304, a driving gear 305, a driven gear 306 and a gear belt 307. The fixed box 304 passes through the muffle furnace body 1. A cavity is opened inside the fixed box 304. The driving turntable 301 is installed at one end of the fixed box 304 through a first rotating shaft. The driven turntable 303 is installed at the other end of the fixed box 304 through a second rotating shaft. The driving gear 305, the driven gear 306 and the gear belt 307 are all arranged in the cavity. The first rotating shaft passes through the driving gear 305 and is fixedly connected thereto. The second rotating shaft is inserted through the driven gear 306. The gear belt 307 is sleeved on the outside of the driving gear 305 and the driven gear 306, and the driving gear 305 and the driven gear 306 are meshed and connected with the gear belt 307. When there is a difference in the total weight of the crucibles and materials placed on the two crucible brackets 204, the two lifting components are lifted and lowered, and the driving turntable 301 is driven to rotate by the long rod 302, and the driving turntable 301 drives the driving gear 305 to rotate, and the driven gear 306 is driven to rotate through the transmission of the gear belt 307, thereby driving the driven turntable 303 to rotate, and the quality difference information of the two lifting components is transmitted to the quality difference detection mechanism 4.

[0039] Furthermore, a strip groove 308 is provided at one end of the long rod 302, and a connecting column 211 is fixedly installed at one end of the insulation box 206, and the connecting column 211 passes through the strip groove 308. The width of the strip groove 308 is equal to the diameter of the connecting column 211, that is, the top and bottom ends of the strip groove 308 are in contact with the connecting column 211. When the lifting component is lifted, it can immediately act on the long rod 302 through the connecting column 211 to drive the active turntable 301 to rotate. Since the moving trajectory of the lifting component is not on the rotating axis of the active turntable 301, when the lifting component drives the long rod 302 to deflect, the contact position of the connecting column 211 and the long rod 302 changes. Therefore, the strip groove 308 here is set to a strip shape to avoid interference between the descending action of the connecting column 211 and the deflection action of the long rod 302.

[0040] Furthermore, if Figure 7-Figure 9 As shown, the quality difference detection mechanism 4 includes a housing 401 and a tension scale 402, the housing 401 is fixedly mounted on the top of the muffle furnace body 1, the tension scale 402 is fixedly mounted inside the housing 401, and the detection end of the tension scale 402 is fixedly connected with a connecting rope 404, the connecting rope 404 passes through the bottom of the housing 401 and is fixedly connected to the outer wall of the driven turntable 303, and the deflection force of the driven turntable 303 is transmitted to the tension scale 402 through the connecting rope 404, so as to detect the deflection force of the driven turntable 303, and then obtain the quality difference between the two lifting components, that is, the quality of the pure material. After the detection is completed, the crucibles on the two lifting components are removed, the masses of the two lifting components are consistent, the deflection force providing the deflection of the driven turntable 303 becomes zero, the built-in elastic structure of the tension scale 402 is reset, and the driven turntable 303 is reset through the connecting rope 404, and the driving gear 305 is driven to reset through the transmission of the gear belt 307, and the two lifting components are restored to a balanced state.

[0041] Furthermore, two steering wheels 405 are rotatably mounted on the inner wall of the outer shell 401, and the two steering wheels 405 are symmetrically arranged on both sides of the extension line of the detection end of the tension scale 402, and the two steering wheels 405 are tangent to the extension line of the detection end of the tension scale 402, to ensure that during the rotation of the driven turntable 303, the pulling direction of the tension scale 402 by the connecting rope 404 is always consistent with the detection end of the tension scale 402, so as to avoid affecting the tension detection result.

[0042] Furthermore, an observation port 403 is provided on the front of the housing 401 , and the position of the display screen of the tension scale 402 corresponds to the position of the observation port 403 , so as to facilitate real-time observation of data changes of the tension scale 402 and obtain continuous dynamic weight changes of pure materials.

[0043] Furthermore, a first rope groove is formed on the outer wall of the driven turntable 303, and a second rope groove is formed on the outer wall of the steering wheel 405. The cross-sections of the first rope groove and the second rope groove are both semicircular, and the diameters of the cross-sections of the first rope groove and the second rope groove are both the same as the diameters of the cross-sections of the connecting rope 404. The function of the first rope groove is to ensure that the connecting rope 404 is always wound along the outer wall of the driven turntable 303 when the driven turntable 303 rotates, so as to avoid affecting the detection of the deflection force of the driven turntable 303. The function of the second rope groove is to ensure that the connecting rope 404 passes through the two steering wheels 405 without being squeezed, so as to avoid affecting the detection of the deflection force of the driven turntable 303.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A muffle furnace for detecting loss on ignition, comprising a muffle furnace body (1), characterized in that: It also comprises two crucible lifting mechanisms (2), a mass difference conduction mechanism (3) and a mass difference detection mechanism (4), one end of the mass difference conduction mechanism (3) passes through the top of the muffle furnace body (1) to the inside thereof, the crucible lifting mechanism (2) is arranged inside the muffle furnace body (1), and the two crucible lifting mechanisms (2) are symmetrically arranged on both sides of the mass difference conduction mechanism (3); The crucible lifting mechanism (2) comprises a lifting component, the lifting component can detect the weight of the crucible and the material, and the lifting component can be lifted and lowered, a driving turntable (301) is rotatably mounted on one end of the mass difference transmission mechanism (3), long rods (302) are symmetrically fixedly mounted on both sides of the outer wall of the driving turntable (301), and the long rods (302) are slidably connected to the corresponding lifting component, a driven turntable (303) is rotatably mounted on the other end of the mass difference transmission mechanism (3), and the driven turntable (303) can be deflected synchronously with the driving turntable (301), and the mass difference detection mechanism (4) can detect the deflection force of the driven turntable (303); The lifting assembly comprises a lifting frame (203) and a crucible bracket (204); a plurality of connection blocks (205) are fixedly mounted on the outer wall of the lifting frame (203); a plurality of protrusions (208) are fixedly mounted on the outer wall of the crucible bracket (204); a limiting column (209) is fixedly mounted on the bottom end of the protrusion (208); each limiting column (209) is inserted through the corresponding connection block (205); a heat insulation box (206) is fixedly mounted on the bottom of the lifting frame (203); an electronic scale (207) is fixedly mounted inside the heat insulation box (206); a detection end of the electronic scale (207) is inserted through the heat insulation box (206) and the lifting frame (203); a protrusion (210) is fixedly mounted on the bottom of the crucible bracket (204); and the protrusion (210) is in contact with the detection end of the electronic scale (207); The crucible lifting mechanism (2) further comprises a base (201), the base (201) being fixedly mounted inside the muffle furnace body (1), a plurality of guide rods (202) being fixedly mounted on the top of the base (201), each of the guide rods (202) being inserted through a corresponding connecting block (205), and the connecting block (205) being slidably connected to the corresponding guide rod (202), and a limit block being provided at one end of the guide rod (202).

2. A muffle furnace for loss on ignition detection according to claim 1, characterized in that: The mass difference transmission mechanism (3) further comprises a fixed box (304), a driving gear (305), a driven gear (306) and a gear belt (307); the fixed box (304) is inserted through the muffle furnace body (1); a cavity is provided inside the fixed box (304); the driving rotating disk (301) is mounted on one end of the fixed box (304) via a first rotating shaft; the driven rotating disk (303) is mounted on the other end of the fixed box (304) via a second rotating shaft; The driving gear (305), the driven gear (306) and the gear belt (307) are all arranged in the cavity, the first rotating shaft penetrates through the driving gear (305) and is fixedly connected thereto, the second rotating shaft penetrates through the driven gear (306) and is fixedly connected thereto, the gear belt (307) is sleeved on the outside of the driving gear (305) and the driven gear (306), and the driving gear (305) and the driven gear (306) are both meshedly connected with the gear belt (307).

3. A muffle furnace for loss on ignition detection according to claim 2, characterized in that: A strip groove (308) is formed at one end of the long rod (302), and a connecting column (211) is fixedly installed at one end of the heat insulation box (206). The connecting column (211) passes through the strip groove (308), and the width of the strip groove (308) is equal to the diameter of the connecting column (211).

4. A muffle furnace for loss on ignition detection according to claim 3, characterized in that: The quality difference detection mechanism (4) comprises a shell (401) and a tension scale (402), wherein the shell (401) is fixedly mounted on the top of the muffle furnace body (1), and the tension scale (402) is fixedly mounted inside the shell (401), and a connecting rope (404) is fixedly connected to the detection end of the tension scale (402), and the connecting rope (404) is inserted through the bottom of the shell (401) and is fixedly connected to the outer wall of the driven turntable (303).

5. A muffle furnace for loss on ignition detection according to claim 4, characterized in that: Two steering wheels (405) are rotatably mounted on the inner wall of the housing (401), and the two steering wheels (405) are symmetrically arranged on both sides of the extension line of the detection end of the tension scale (402), and the two steering wheels (405) are tangent to the extension line of the detection end of the tension scale (402).

6. A muffle furnace for loss on ignition detection according to claim 5, characterized in that: An observation port (403) is provided on the front of the housing (401), and the position of the display screen of the tension scale (402) corresponds to the position of the observation port (403).

7. A muffle furnace for loss on ignition detection according to claim 6, characterized in that: The outer wall of the driven turntable (303) is provided with a first rope groove, and the outer wall of the steering wheel (405) is provided with a second rope groove, the cross-sections of the first rope groove and the second rope groove are both semicircular, and the diameters of the cross-sections of the first rope groove and the second rope groove are both the same as the diameter of the cross-section of the connecting rope (404).

8. A method for detecting loss on ignition using a muffle furnace for detecting loss on ignition as claimed in any one of claims 4 to 7, characterized in that: The method comprises the following steps: Step 1: Select two completely identical crucibles and place them on two crucible brackets (204) respectively, start the muffle furnace body (1), start burning from a low temperature until 950° C. and maintain for 1 hour, read the mass difference between the two crucibles by a tension scale (402), if the mass difference between the two crucibles is always less than 0.5 mg, proceed to the next step; Step 2: close the muffle furnace body (1), wait for the furnace to cool down, weigh 1.0000-2.0000g of the pre-dried material and pour it into one of the crucibles, restart the muffle furnace body (1), start burning from a low temperature until 950°C and keep it for 1 hour, close the muffle furnace body (1), wait for the furnace to cool down for 20min-30min, restart the muffle furnace body (1), raise the furnace temperature to 950°C and keep it for 30min, close the muffle furnace body (1) again, wait for the furnace to cool down, and read the weight of the material through the tension scale (402) all the time during the process until it is observed that the weight of the material fluctuates for a long time and does not exceed 0.5mg. The data read by the tension scale (402) is the mass of the material after burning, which is compared with the initial mass of the material to obtain the loss on ignition; Step 3: After the furnace has completely cooled, take out the electronic scale (207) in the insulation box (206), observe the changes in the total mass of the crucible and the material recorded in the electronic scale (207), and compare them with the changes in the material mass detected by the tension scale (402) as reference data to verify the accuracy of the loss on ignition.

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