Resistance furnace top suspension type crucible weighing device

Abstract

The application belongs to the technical field of resistance furnaces, and particularly relates to a top suspension type crucible weighing device of a resistance furnace, which comprises a supporting table, the one side of the supporting table is provided with a lifting plate, the upper side of the lifting plate is provided with a connecting sleeve, the upper side of the connecting sleeve is provided with a supporting ring, the middle part of the supporting ring is rotationally connected with a crucible shaft, a plurality of weighing sensors are arranged at equal intervals between the connecting sleeve and the supporting ring, a plurality of mounting grooves are formed in the top end of the connecting sleeve, the inside of the mounting grooves is provided with limiting insertion columns, the upper side of the supporting table is provided with a replacement assembly, the replacement assembly comprises a pair of clamping frames arranged on the outer side of the lifting plate, and the output end of the electric telescopic rod is connected with the clamping frame through an opening and closing assembly; through the automatic replacement assembly, the work station is completed by the rotation of the gear ring driven by the motor, and the electric telescopic rod, the cylinder and the opening and closing assembly are cooperatively used, so that the dismounting and assembling of the weighing sensor can be completed under the condition that the resistance furnace continuously runs and does not stop.

Description

Technical Field

[0001] This invention belongs to the field of resistance furnace technology, specifically a top-suspended crucible weighing device for resistance furnaces. Background Technology

[0002] Resistance furnaces are widely used in high-temperature processing scenarios such as material sintering, metal smelting, and mineral thermal analysis. The crucible, as the core component supporting the material, requires real-time monitoring of its weight and the weight changes of the material inside during production to control the melting rate, material loss, and finished product output. Existing crucible weighing methods are divided into offline weighing and in-furnace online weighing. Offline weighing relies on an external balance, while online weighing mostly uses a bottom-supported weighing structure. A few simpler devices use a top-suspended structure adapted to small tubular resistance furnaces. All types of weighing structures have inherent limitations in terms of adaptability and accuracy.

[0003] The offline weighing process involves first shutting down the resistance furnace and opening the furnace lid. The crucible is then removed entirely using a clamp. After the crucible cools to room temperature naturally, it is placed on an analytical balance or platform scale for weighing. The data is recorded, and then the crucible is returned to the furnace for reheating and refining. The bottom-supported online weighing system places the weighing sensor below the support base of the resistance furnace. The crucible is placed on the support bracket, and the overall weight of the crucible is directly transferred to the bottom sensor through the bracket. The weight can be collected in real time without the crucible needing to be removed or placed. The existing top-suspended weighing system is only used with small vertical tube furnaces. The sensor is fixed to the outside of the top of the furnace cylinder, and the crucible is suspended downwards by a thin metal wire. There is no heat insulation buffer structure between the furnace body and the sensor, and the high-temperature radiation from the furnace chamber is isolated by the wire.

[0004] Existing crucible weighing devices rely on weighing sensors to collect weight data. When the equipment is running continuously for a long time, individual sensors are prone to failure and damage. After a sensor is damaged, the machine must be stopped to carry out the replacement work, which interrupts the heat treatment reaction of the materials in the furnace and affects the continuity of production. In addition, the sensor is installed at a high position on the top of the resistance furnace, and personnel need to climb to operate during the replacement work. If the furnace body is not completely shut down, the high temperature furnace cavity can easily cause burns and scalds.

[0005] Therefore, the present invention provides a top-suspended crucible weighing device for a resistance furnace. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a top-suspended crucible weighing device for a resistance furnace, comprising a support platform, a lifting plate on one side of the support platform, a connecting sleeve above the lifting plate, a support ring above the connecting sleeve, a crucible shaft rotatably connected to the middle of the support ring, multiple weighing sensors equally spaced between the connecting sleeve and the support ring, multiple mounting slots on the top of the connecting sleeve, and limit pins inside the mounting slots, the limit pins being able to be inserted into holes on the outside of the weighing sensors, a replacement assembly installed above the support platform for quick replacement of the weighing sensors, the replacement assembly including a pair of clamping frames disposed on the outside of the lifting plate, the clamping frames being able to clamp the weighing sensors, and the output end of the electric telescopic rod being connected to the clamping frames via an opening and closing assembly.

[0008] Preferably, the replacement assembly further includes a support shell fixed to the top of the support platform, a gear ring rotatably connected inside the support shell, a motor installed at the top of the support platform, and the end of the motor shaft meshing with the top of the gear ring via gears.

[0009] Preferably, a first connecting plate is fixed to the bottom end of the gear ring, a first cylinder is installed below the first connecting plate, a pusher is fixed to the output shaft end of the first cylinder, guide rods are fixed to both sides of the pusher, the guide rods are inserted into the inside of the first connecting plate, a guide frame is fixed to the pusher, and the electric telescopic rod is installed at the end of the guide frame away from the clamping frame.

[0010] Preferably, the opening and closing assembly includes two upper and lower second connecting plates fixed to the end of the electric telescopic rod. The top of the second connecting plate is provided with a pair of guide grooves. The clamping frame is inserted between the two second connecting plates. The top and bottom of one end of the clamping frame are both fixed with sliding columns. The sliding columns are slidably connected inside the guide grooves. A connecting rod passes through the middle of the two clamping frames. Both ends of the connecting rod are fixed with sliders. Multiple rollers are provided on the other side of the sliders. Guide grooves are provided on both sides inside the guide frame. Air compression components are provided inside the guide grooves.

[0011] Preferably, the air compression assembly includes a telescopic cavity formed inside the guide frame, a pressure bar slidably connected inside the telescopic cavity, a guide slope formed at the end of the pressure bar away from the electric telescopic rod, a third spring fixed between the pressure bar and the inner wall of the telescopic cavity, support cylinders fixed on both sides of the guide frame, an air guide hole formed inside the guide frame, the telescopic cavity and the support cylinders communicating through the air guide hole, and a lifting column inserted at the top of the support cylinder.

[0012] Preferably, the inner side of the guide frame is provided with two sets of guide grooves, the top of the push frame is equipped with a second cylinder, the output shaft end of the second cylinder is fixed with a loading rack, and two insert plates are fixed on both sides of the loading rack, the insert plates can be inserted into the guide grooves.

[0013] Preferably, a loading box is fixed to the bottom end of the guide frame, and the inner diameter of the loading box is larger than the outer diameter of the weighing sensor.

[0014] Preferably, metal springs are fixed on both sides inside the loading rack, and a weighing sensor can be installed inside the loading rack. The metal springs limit the movement of the weighing sensor on both sides.

[0015] Preferably, a second spring is fitted at each end of the connecting rod, one end of the second spring is fixedly connected to the slider, and the other end of the second spring is fixedly connected to the clamping frame.

[0016] Preferably, the bottom end of the guide frame is fixed with a plug, the connecting sleeve is provided with a plug hole below the mounting groove, the connecting sleeve is provided with a lifting plate inside, the lifting plate is fixedly connected with a plurality of limiting plugs, the bottom end of the lifting plate is fixed with a first spring, the first spring is fixedly connected with the connecting sleeve, and the middle part of the lifting plate is provided with a recess.

[0017] The beneficial effects of this invention are as follows: 1. The above-displacement crucible weighing device for a resistance furnace, as described in this invention, achieves station alignment by automatically replacing components and relying on a motor to drive the gear ring to rotate. It works in conjunction with an electric telescopic rod, a cylinder, and an opening and closing assembly, enabling the disassembly and assembly of the weighing sensor to be completed while the resistance furnace is running continuously without stopping.

[0018] 2. The top-suspended crucible weighing device for a resistance furnace described in this invention effectively improves the convenience of sensor replacement and the stability of equipment operation through the cooperation of a compressed air assembly, a limiting insert, a spring structure, and a loading protection structure. When replacing a sensor, the support ring can be automatically lifted to form a gap for disassembly and assembly, reducing the difficulty of disassembly and assembly. The spring structure can effectively prevent the sensor from falling off during clamping and movement. The loading box and loading rack equipped with the equipment can complete the storage of damaged sensors, pre-installation of new sensors, and automatic unloading. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the toothed ring structure in this invention; Figure 3 This is a schematic diagram of the pusher structure in this invention; Figure 4 This is a schematic diagram of the loading rack structure in this invention; Figure 5 This is a schematic diagram of the guide frame structure in this invention; Figure 6 This is a schematic diagram of the clamping frame structure in this invention; Figure 7 This is a schematic diagram of the internal structure of the support cylinder in this invention; Figure 8 This is a schematic diagram of the mounting groove structure in this invention; Figure 9 This is a schematic diagram of the lifting plate structure in this invention.

[0021] In the diagram: 1. Support platform; 11. Lifting plate; 111. Connecting sleeve; 112. Mounting groove; 113. Insertion hole; 114. Lifting plate; 115. Limiting pin; 116. First spring; 12. Crucible shaft; 121. Support ring; 13. Weighing sensor; 2. Support shell; 21. Gear ring; 211. Motor; 22. First connecting plate; 221. First cylinder; 222. Push frame; 223. Guide frame; 2231. Guide groove; 2232. Telescopic cavity; 223 3. Air vent; 224. Electric telescopic rod; 225. Loading box; 226. Support cylinder; 2261. Lifting column; 227. Insert bracket; 23. Loading rack; 231. Second cylinder; 232. Insert plate; 233. Metal spring; 24. Clamping frame; 241. Connecting rod; 242. Second spring; 243. Sliding block; 244. Sliding column; 245. Second connecting plate; 246. Guide groove; 25. Pressure strip; 251. Third spring; 252. Guide slope. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 8As shown in the embodiment of the present invention, a top-suspended crucible weighing device for a resistance furnace includes a support platform 1. A lifting plate 11 is provided on one side of the support platform 1. A connecting sleeve 111 is provided above the lifting plate 11. A support ring 121 is provided above the connecting sleeve 111. A crucible shaft 12 is rotatably connected to the middle of the support ring 121. Multiple weighing sensors 13 are provided at equal intervals between the connecting sleeve 111 and the support ring 121. Multiple mounting slots 112 are provided at the top of the connecting sleeve 111. Limiting pins 115 are provided inside the mounting slots 112. The limiting pins 115 can be inserted into the holes on the outside of the weighing sensors 13. A replacement assembly is installed above the support platform 1 for quickly replacing the weighing sensors 13. The replacement assembly includes a pair of clamping frames 24 provided on the outside of the lifting plate 11. The clamping frames 24 can clamp the weighing sensors 13. The output end of the electric telescopic rod 224 is connected to the clamping frames 24 through an opening and closing assembly.

[0024] During the operation of the resistance furnace, a crucible is placed inside the furnace cavity. The crucible holds the deposition material. Heating the crucible causes the solid material inside to sublimate into a gaseous state. The gaseous material migrates to the surface of a low-temperature substrate and condenses, thus forming a solid deposition layer on the substrate. During this process, the material in the crucible gradually decreases. However, the temperature inside the resistance furnace is extremely high, making it impossible to directly observe the remaining material. To solve this problem, the remaining material is monitored by weight changes. During operation, the bottom end of the crucible shaft 12 is connected to the crucible, and the crucible shaft 12 extends into the interior of the resistance furnace. The weight of the crucible and the material inside pulls the support ring 121 downwards. At this time, the support ring 121 will press down on the weighing sensor 13. At this time, multiple weighing sensors 13 will support the support ring 121 and the crucible shaft 12. Simultaneously, the weighing sensors 13 will weigh the weight in real time. When the crucible is filled with raw materials and heating begins, the weighing sensor 13 will transmit the current initial weight to the control terminal. During the heating process, the solid raw materials will gradually sublimate into a gaseous state, so the weight inside the crucible will gradually decrease. The weighing sensor 13 will detect the weight change at this time and transmit the weight data to the control terminal. The operator can observe the weight of the crucible through the control terminal, thereby timely knowing the remaining amount of raw materials inside the crucible. During monitoring, the load cells 13 may become damaged with prolonged use, leading to abnormal weighing data from one of them. To avoid disrupting the current processing within the resistance furnace, a replacement assembly is installed to replace the load cells 13 online. The load cells 13 are connected to the connecting sleeve 111 via a plug-in connector, transmitting data through the connector. During replacement, the clamping frame 24 and the electric telescopic rod 224 rotate to the position of the load cell 13 requiring replacement. Then, the electric telescopic rod 224 pushes the clamping frame 24 in, and the damaged load cell 13 is removed through the clamping frame 24. The load cell 13 is clamped between the connecting sleeve 111 and the support ring 121. The limiting pin 115 separates from the hole on the outside of the load cell 13, and the load cell 13 is pulled out by the electric telescopic rod 224 pulling the clamping frame 24. Then the clamping frame 24 puts down the damaged load cell 13 and clamps the new load cell 13. The new load cell 13 is pushed into the corresponding position by the electric telescopic rod 224. Then the clamping frame 24 releases the load cell 13 and inserts the limiting pin 115 into the hole on the outside of the load cell 13 to limit its movement. This allows for the rapid replacement of the damaged load cell 13 without stopping the heating inside the resistance furnace.

[0025] like Figures 1 to 2 As shown, the replacement component also includes a support shell 2 fixed to the top of the support platform 1. A gear ring 21 is rotatably connected inside the support shell 2. A motor 211 is installed at the top of the support platform 1. The end of the rotating shaft of the motor 211 is meshed with the top of the gear ring 21 through a gear.

[0026] During use, the load cell 13 at the corresponding position needs to be replaced. Therefore, during the replacement process, the motor 211 is started to rotate. At this time, the motor 211 drives the gear ring 21 to rotate through the gear at the end of the shaft. The gear ring 21 drives the clamping frame 24 and the electric telescopic rod 224 below to rotate to the corresponding position, so as to facilitate the accurate replacement of different load cells 13.

[0027] like Figures 1 to 3 As shown, a first connecting plate 22 is fixed to the bottom end of the gear ring 21, and a first cylinder 221 is installed below the first connecting plate 22. A pusher 222 is fixed to the output shaft end of the first cylinder 221. Guide rods are fixed on both sides of the pusher 222 located on the first cylinder 221. The guide rods are inserted into the first connecting plate 22. A guide frame 223 is fixed to the pusher 222. An electric telescopic rod 224 is installed at the end of the guide frame 223 away from the clamping frame 24.

[0028] During use, to avoid affecting the use of the weighing device by the push frame 222 and the overall structure below, the position of the push frame 222 needs to be adjusted according to requirements. In daily use, the push frame 222 and the overall structure below should be kept away from the connecting sleeve 111. When the load cell 13 is damaged, the start motor 211 drives the gear ring 21 to rotate and drive the first connecting plate 22. The first connecting plate 22 drives the push frame 222 and the structure below to rotate to the corresponding position through the guide rod. At this time, the first cylinder 221 is started to push the push frame 222 forward, so that the push frame 222 drives the overall structure below to approach the connecting sleeve 111. After approaching, the electric telescopic rod 224 pushes the clamping frame 24 to extend so that the load cell 13 can be replaced. After the load cell 13 is replaced, the first cylinder 221 pulls the push frame 222 to automatically reset, so that the push frame 222 and the overall structure below do not affect the normal use of the connecting sleeve 111.

[0029] like Figures 1 to 6 As shown, the opening and closing assembly includes two upper and lower second connecting plates 245 fixed to the ends of the electric telescopic rod 224. A pair of guide grooves 246 are provided at the top of the second connecting plates 245. The clamping frame 24 is inserted between the two second connecting plates 245. The top and bottom ends of one end of the clamping frame 24 are fixed with sliding columns 244. The sliding columns 244 are slidably connected inside the guide grooves 246. A connecting rod 241 passes through the middle of the two clamping frames 24. Slider blocks 243 are fixed at both ends of the connecting rod 241. Multiple rollers are provided on the other side of the slider blocks 243. Guide grooves are provided on both sides inside the guide frame 223. Air compression components are provided inside the guide grooves.

[0030] During use, the support shell 2 needs to be opened and closed by the opening and closing assembly to clamp the load cell 13. In the initial state of clamping, the electric telescopic rod 224 extends and pushes the second connecting plate 245 to a position close to the end of the guide frame 223. At this time, the slider 243 slides inside the guide groove inside the guide frame 223. When the slider 243 slides to the end of the guide groove, the guide groove limits the connecting rod 241 through the slider 243. The connecting rod 241 limits the two clamping frames 24. Then the electric telescopic rod 224 continues to push the second connecting plate 245. The second connecting plate 245 drives the guide slide 246 to move forward. During the movement, the sliding column 244 slides inside the guide slide 246, thereby causing the sliding column 244 to drive the clamping frame 24 to open to both sides. When the clamping frame 24 opens, the first cylinder 221 pushes the pusher 222, which in turn moves the guide frame 223 forward, so that the clamping frame 24 fits over the outside of the load cell 13. Then, the electric telescopic rod 224 pulls the second connecting plate 245 in the opposite direction. At this time, the air compressor will apply resistance to the slider 243 in the opposite direction. The slider 243 is then forced to limit the clamping frame 24 through the connecting rod 241. The second connecting plate 245 drives the guide slide 246 to move in the opposite direction. Under the action of the guide slide 246, the slide column 244 gathers towards the middle of the second connecting plate 245. At this time, the clamping frame 24 can clamp the load cell 13. The electric telescopic rod 224 continues to pull the second connecting plate 245, which pulls the clamping frame 24 through the slide column 244, so that the slider 243 overcomes the resistance of the air compressor, thereby pulling the load cell 13 out of the mounting slot 112.

[0031] like Figures 1 to 7 As shown, the air compression assembly includes a telescopic cavity 2232 opened inside the guide frame 223. A pressure strip 25 is slidably connected inside the telescopic cavity 2232. A guide slope 252 is opened at the end of the pressure strip 25 away from the electric telescopic rod 224. A third spring 251 is fixed between the pressure strip 25 and the inner wall of the telescopic cavity 2232. Support cylinders 226 are fixed on both sides of the guide frame 223. An air guide hole 2233 is opened inside the guide frame 223. The telescopic cavity 2232 and the support cylinder 226 are connected through the air guide hole 2233. A lifting column 2261 is inserted into the top of the support cylinder 226.

[0032] When the guide frame 223 is pushed forward and approaches the connecting sleeve 111, the support cylinder 226 and the lifting column 2261 are driven to insert into the position between the connecting sleeve 111 and the support ring 121. The bottom end of the support cylinder 226 is close to the top end of the connecting sleeve 111. During the process of the electric telescopic rod 224 pulling the second connecting plate 245, the slider 243 will contact the guide slope 252. Through the guidance of the guide slope 252, the pressure strip 25 is pressed into the interior of the telescopic cavity 2232. At this time, the gas inside the telescopic cavity 2232 is input into the support cylinder through the air guide hole 2233. Inside 226, the gas at the bottom of the support cylinder 226 pushes the lifting column 2261 upward. At this time, the lifting column 2261 pushes the support ring 121 upward, thereby raising the support ring 121 by 0.1cm. This creates a gap between the load cell 13 and the support ring 121, making it easier to separate the load cell 13 from below the support ring 121. During the subsequent pulling of the clamping frame 24, the slider 243 is supported on the surface of the pressure bar 25, maintaining the position of the lifting column 2261, thus facilitating the subsequent installation of a new load cell 13.

[0033] like Figures 1 to 5As shown, the inner side of the guide frame 223 is provided with two sets of guide grooves 2231. The top of the push frame 222 is equipped with a second cylinder 231. The output shaft end of the second cylinder 231 is fixed with a loading rack 23. Two insert plates 232 are fixed on both sides of the loading rack 23. The insert plates 232 can be inserted into the guide grooves 2231.

[0034] After the clamping frame 24 removes the damaged load cell 13, the load cell 13 needs to be removed. At this time, the electric telescopic rod 224 pulls the second connecting plate 245 to move the sliders 243 on both sides to the position between the two guide grooves 2231. At this time, the electric telescopic rod 224 is paused, and the second cylinder 231 is started to push the loading rack 23 downward a certain distance. The loading rack 23 drives the two sets of insert plates 232 to insert into the guide grooves 2231. At this time, the slider 243 can be placed between the two guide grooves 2231. Then, the electric telescopic rod 224 pushes the second connecting plate 245, which can move the second connecting plate 245 in the direction of the electric telescopic rod 224. The slider 243 limits the clamping frame 24 through the insert plate 232, so that the guide groove 246 guides the sliding column 244, causing the clamping frame 24 to open to both sides. At this time, the load cell 13 separates from the clamping frame 24, so that the load cell 13 is removed.

[0035] like Figures 1 to 4 As shown, a loading box 225 is fixed to the bottom of the guide frame 223, and the inner diameter of the loading box 225 is larger than the outer diameter of the weighing sensor 13.

[0036] When the load cell 13 falls from between the clamps 24, in order to prevent the load cell 13 from damaging the resistance furnace, a loading box 225 is set up to receive the load cell 13. After replacement, the staff can take out the load cell 13 from the loading box 225. This can achieve temporary storage of the load cell 13 and avoid damage caused by the load cell 13 falling.

[0037] like Figures 1 to 4 As shown, metal springs 233 are fixed on both sides inside the loading rack 23. A weighing sensor 13 can be installed inside the loading rack 23. The metal springs 233 limit the movement of the weighing sensor 13 on both sides.

[0038] When the damaged load cell 13 is removed, a new load cell 13 needs to be replaced. A replacement load cell 13 is pre-installed inside the loading rack 23. The second cylinder 231 continues to push the loading rack 23 downwards until it is inside the guide frame 223. At this time, the clamping frame 24 is in an open state. The loading rack 23 causes the load cell 13 to fall between the clamping frames 24. Then, the electric telescopic rod 224 pulls the second connecting plate 245, causing the slider 243 to be clamped by the clamping frame 24 due to the limit of the insert plate 232. At this time, the load cell 13 can be placed... 3 is clamped, then the second cylinder 231 is activated to pull the loading rack 23 upward. At this time, the metal spring 233 is deformed and separated from the load cell 13 due to the tension overcoming its elasticity. Then the electric telescopic rod 224 pushes the second connecting plate 245 to drive the clamping frame 24 to push the new load cell 13 back into the mounting slot 112. Continue to push the second connecting plate 245 to open the clamping frame 24 and separate it from the load cell 13 to complete the replacement. Then the first cylinder 221 pulls the pusher 222 away from the connecting sleeve 111, thereby realizing the quick replacement of the load cell 13.

[0039] like Figures 1 to 6 As shown, a second spring 242 is respectively fitted at both ends of the connecting rod 241. One end of the second spring 242 is fixedly connected to the slider 243, and the other end of the second spring 242 is fixedly connected to the clamping frame 24.

[0040] During the process of the electric telescopic rod 224 pushing the second connecting plate 245 to move the load cell 13 into the mounting groove 112, the sliding column 244 may slide inside the guide groove 246, causing the clamping frame 24 to open during the movement. Therefore, two second springs 242 are set to apply resistance to both sides of the clamping frame 24 to prevent the clamping frame 24 from opening during the movement and causing the load cell 13 to fall off.

[0041] like Figures 1 to 9 As shown, the bottom end of the guide frame 223 is fixed with a plug 227, the connecting sleeve 111 is located below the mounting groove 112 and has a plug hole 113, the inside of the connecting sleeve 111 is provided with a lifting plate 114, the lifting plate 114 is fixedly connected with a plurality of limit plugs 115, the bottom end of the lifting plate 114 is fixed with a first spring 116, the first spring 116 is fixedly connected with the connecting sleeve 111, and the middle part of the lifting plate 114 is provided with a recess.

[0042] During use, in order to ensure the stability of the load cell 13, the elastic force of the first spring 116 pushes the lifting plate 114, and the lifting plate 114 pushes the limiting pin 115 into the hole on the outside of the load cell 13, thereby achieving the function of limiting the load cell 13. When it is necessary to disassemble or assemble the load cell 13, the first cylinder 221 pushes the pusher 222 to drive the guide frame 223 to move forward, and the guide frame 223 drives the insert 227 to be inserted into the insertion hole 113. The inclined surface in front of the insert 227, together with the concave middle part of the lifting plate 114, can press the lifting plate 114 downward, so that the lifting plate 114 pulls the limiting pin 115 to separate from the hole of the load cell 13. After the new load cell 13 is installed, the guide frame 223 drives the insert 227 to be pulled out from the insertion hole 113. The elastic force of the first spring 116 pushes the lifting plate 114 to insert the limiting insert 115 into the hole of the load cell 13, thereby achieving automatic fixation and ensuring the stability of the load cell 13 during use.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A top-suspended crucible weighing device for a resistance furnace, characterized in that: The device includes a support platform, a lifting plate on one side of the support platform, a connecting sleeve above the lifting plate, a support ring above the connecting sleeve, a crucible shaft rotatably connected to the middle of the support ring, multiple load cells evenly spaced between the connecting sleeve and the support ring, multiple mounting slots at the top of the connecting sleeve, and limit pins inside the mounting slots that can be inserted into holes on the outside of the load cells. A replacement assembly is installed above the support platform for quick replacement of the load cells. The replacement assembly includes a pair of clamping frames on the outside of the lifting plate that can clamp the load cells. The output end of the electric telescopic rod is connected to the clamping frames via an opening and closing assembly.

2. The top-suspended crucible weighing device for a resistance furnace according to claim 1, characterized in that: The replacement assembly also includes a support shell fixed to the top of the support platform. A gear ring is rotatably connected inside the support shell. A motor is installed at the top of the support platform. The end of the motor shaft is meshed with the top of the gear ring through a gear.

3. The top-suspended crucible weighing device for a resistance furnace according to claim 2, characterized in that: The bottom end of the gear ring is fixed with a first connecting plate, and a first cylinder is installed below the first connecting plate. A pusher is fixed to the output shaft end of the first cylinder. Guide rods are fixed on both sides of the pusher. The guide rods are inserted inside the first connecting plate. The pusher is fixed with a guide frame. The electric telescopic rod is installed at the end of the guide frame away from the clamping frame.

4. The top-suspended crucible weighing device for a resistance furnace according to claim 3, characterized in that: The opening and closing assembly includes two upper and lower second connecting plates fixed to the end of the electric telescopic rod. A pair of guide grooves are provided at the top of the second connecting plates. The clamping frame is inserted between the two second connecting plates. A sliding column is fixed at the top and bottom of one end of the clamping frame. The sliding column is slidably connected inside the guide groove. A connecting rod passes through the middle of the two clamping frames. A slider is fixed at both ends of the connecting rod. Multiple rollers are provided on the other side of the slider. Guide grooves are provided on both sides inside the guide frame. A compressed air assembly is provided inside the guide groove.

5. A top-suspended crucible weighing device for a resistance furnace according to claim 4, characterized in that: The compressed air assembly includes a telescopic cavity formed inside the guide frame. A pressure bar is slidably connected inside the telescopic cavity. A guide slope is formed at the end of the pressure bar away from the electric telescopic rod. A third spring is fixed between the pressure bar and the inner wall of the telescopic cavity. Support cylinders are fixed on both sides of the guide frame. An air guide hole is formed inside the guide frame. The telescopic cavity and the support cylinder are connected through the air guide hole. A lifting column is inserted into the top of the support cylinder.

6. The top-suspended crucible weighing device for a resistance furnace according to claim 5, characterized in that: The inner side of the guide frame has two sets of guide grooves. The top of the push frame is equipped with a second cylinder. The output shaft end of the second cylinder is fixed with a loading rack. Two insert plates are fixed on both sides of the loading rack. The insert plates can be inserted into the guide grooves.

7. A top-suspended crucible weighing device for a resistance furnace according to claim 6, characterized in that: A loading box is fixed to the bottom of the guide frame, and the inner diameter of the loading box is larger than the outer diameter of the weighing sensor.

8. A top-suspended crucible weighing device for a resistance furnace according to claim 7, characterized in that: Metal springs are fixed on both sides inside the loading rack. A weighing sensor can be installed inside the loading rack. The metal springs limit the movement of the weighing sensor on both sides.

9. A top-suspended crucible weighing device for a resistance furnace according to claim 8, characterized in that: A second spring is fitted at each end of the connecting rod. One end of the second spring is fixedly connected to the slider, and the other end of the second spring is fixedly connected to the clamping frame.

10. A top-suspended crucible weighing device for a resistance furnace according to claim 3, characterized in that: The bottom end of the guide frame is fixed with a bracket, the connecting sleeve is provided with a hole below the mounting groove, the connecting sleeve is provided with a lifting plate, the lifting plate is fixedly connected with multiple limiting pins, the bottom end of the lifting plate is fixed with a first spring, the first spring is fixedly connected with the connecting sleeve, and the middle part of the lifting plate is provided with a recess.

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