High-temperature heat pipe fixed downward insertion testing device for cooling graphitization furnace

Abstract

The invention discloses a high-temperature heat pipe fixing and downward-inserting testing device for a cooling graphitization furnace. The high-temperature heat pipe fixing and downward-inserting testing device comprises a hanging cable, an instrument control support, a remote control worm motor, a motor lifting rod, a heat pipe fixing plate, an inter-plate connecting rod, a high-temperature alkali metal heat pipe and a depth scale. The device is simple and reliable in design structure, the downward insertion depth of the heat pipe is convenient to control, the temperature detector is convenient to arrange, research and test of the high-temperature heat pipe cooling graphitization furnace heat preservation material can be explored, and the test efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery materials, and in particular to a high-temperature heat pipe fixed insertion testing device for cooling a graphitization furnace. Background Art

[0002] Mainstream negative electrode materials include graphite materials, silicon-based materials, lithium titanate, etc. Among them, graphite materials dominate the market due to their high conductivity, stability and low cost. However, the anisotropy of natural graphite particles may cause large volume expansion during charging and discharging, affecting the cycle life. At high temperatures, the amorphous carbon or microcrystalline carbon in the carbon material will gradually transform into graphite crystals with a hexagonal structure. In this process, the carbon atoms are rearranged, impurities and defects are eliminated, the lattice order is improved, and the interlayer electron migration ability is enhanced, the resistivity is reduced, and the conductivity is improved. The Acheson Graphitization Furnace is a traditional high-temperature heat treatment equipment that is widely used in the graphitization treatment of lithium battery negative electrode materials (such as artificial graphite and natural graphite). However, due to the low thermal conductivity of the graphite and insulation materials in the furnace, the long wait for the graphite furnace to cool down has become an important factor restricting the production speed of negative electrode materials. Summary of the Invention

[0003] To test the cooling capacity of high-temperature heat pipes on graphite furnaces and to understand the impact of different heat pipes, the present invention aims to provide a fixed insertion test device for high-temperature heat pipes used to cool graphitization furnaces. This device can meet the needs of heat pipe testing experiments on large graphite furnaces in graphite production plants without affecting the actual operation and data collection of the heat pipes.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace, comprising a hanging cable 1, an instrumentation support 2, a remote-controlled worm motor 3, a motor lifting rod 4, a heat pipe fixing plate 5, an inter-plate connecting rod 6, a high-temperature alkali metal heat pipe 7 and a depth scale 8; the instrumentation support 2 is composed of a rectangular frame and a solid perforated bottom plate, the remote-controlled worm motor 3 is fixed to the bottom plate of the instrumentation support 2, the motor lifting rod 4 passes through the opening, the upper part cooperates with the remote-controlled worm motor 3, and the lower part is connected to the heat pipe fixing plate 5, the hanging cable 1 is connected to the instrumentation support 2, and is used to suspend the entire device on the lifting equipment of the test site; the heat pipe fixing plate 5 is two identical solid perforated stainless steel plates, and the inter-plate connecting rod 6 of equal length connects the two heat pipe fixing plates 5; the high-temperature alkali metal heat pipe 7 passes through the hole of the heat pipe fixing plate 5 and is fixed at the upper end to the heat pipe fixing plate 5; the depth scale 8 has a significant scale mark and is connected to the bottom of the heat pipe fixing plate 5; the end of the condensation section of the high-temperature alkali metal heat pipe is inserted into the dense graphitization furnace.

[0006] The hanging rope 1, instrumentation and control bracket 2, remote control worm motor 3, and motor lifting rod 4 constitute an instrumentation and control system; the heat pipe fixing plate 5, inter-plate connecting rod 6, high-temperature alkali metal heat pipe 7, and depth scale 8 constitute a cooling system; the remote control worm motor 3 is fixed on the bottom plate of the instrumentation and control bracket 2, and the non-rotating motor lifting rod 4 is used to change the distance between the cooling system and the instrumentation and control system, thereby changing the position of the heat pipe.

[0007] The instrumentation support 2 consists of a rectangular parallelepiped frame structure with a base length of 1m and a height of 1.1m, and a square steel plate with a side length of 1m and a thickness of no less than 10mm. The main material is 304 stainless steel, and four lifting lugs are installed on the top of the instrumentation support 2. 304 stainless steel reduces costs while meeting high-temperature and corrosion resistance requirements. The heavy square steel plate has a high deadweight, which provides some assistance for inserting the heat pipe. It is suspended from the lifting equipment at the test site via a hanging rope 1 equipped with a rotation plate, allowing the entire device to move horizontally and vertically over a wide range.

[0008] The non-rotating motor lift rod 4 is threadedly fixed to the upper surface of the heat pipe mounting plate 5. The forward and reverse rotation of the remote-controlled worm motor 3 allows the cooling system to travel a full 1.3m vertically. The remote-controlled worm motor 3 should be capable of bearing a load greater than 700kg. The bottom plate of the instrumentation support 2 includes several holes for accommodating the power supply for the remote-controlled worm motor 3 and an additional temperature measurement device. This additional temperature measurement device monitors the surface temperature of the remote-controlled worm motor 3, the data acquisition system, and the steel material to prevent temperature limits from being exceeded and ensure test safety.

[0009] The heat pipe fixing plate 5 consists of two 8mm thick, independent circular perforated fixing plates with insulation covering their surfaces, welded together by three inter-plate connecting rods 6. The two fixing plates are spaced 0.8m apart and constructed from high-temperature resistant 310S stainless steel. The double-layered fixing plates provide a circumferential fixation for the heat pipes, preventing bottom-end drift during insertion. Three groups of nine high-temperature alkali metal heat pipe sockets are arranged in an equilateral triangle on the upper and lower fixing plates, with spacing within the three groups of 500mm, 1000mm, and 1500mm, respectively. A group of three heat pipe sockets is arranged in a straight line on one edge of the fixing plate, with a center-to-center spacing of 460mm within each group. Adjusting the distribution of the high-temperature alkali metal heat pipes between the openings allows for testing the impact of different spacing between the heat pipes on the cooling of the graphite furnace. This design facilitates experimental results on the effects of various heat pipe layouts on cooling. Several lifting lugs are provided on the edge of the heat pipe fixing plate 5, along with steel cables, as redundant safety features to prevent the entire device from accidentally falling.

[0010] The depth gauge 8 is primarily made of 304 stainless steel, 1.3 mm long, and features markings spaced 5 cm or 10 cm apart. The high-temperature alkali metal heat pipe 7 is 2 m long and 89 mm in outer diameter, primarily made of 310S stainless steel. The vaporization temperature of the alkali metal working fluid matches the temperature inside the graphite furnace, ensuring the high-temperature heat pipe maintains a high heat transfer efficiency. 310S stainless steel combines high-temperature and corrosion resistance with excellent strength, maintaining the heat pipe's shape. Conical tips of varying angles are positioned at the end of the condenser section of the high-temperature alkali metal heat pipe to facilitate insertion into the dense graphitization furnace. A stainless steel protective tube with lugs is welded to the evaporator section of the high-temperature alkali metal heat pipe to protect the liquid-filled tube and prevent the high-temperature alkali metal heat pipe from falling and being damaged. The depth gauge 8 is flush with the end of the high-temperature alkali metal heat pipe and moves vertically with the cooling system, using markings to measure the insertion depth of the high-temperature alkali metal heat pipe. The depth gauge's design reduces errors caused by relying solely on the motor stroke indication and allows for measuring the heat pipe's insertion depth even when the motor's initial stroke is not zero.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The present invention fully utilizes the deadweight of the device to smoothly insert the high-temperature alkali metal heat pipe into the dense graphitization furnace insulation material. At the same time, the instrumentation and control system is used to achieve a vertical travel range of 1.3 meters, providing control for testing the cooling capacity of high-temperature alkali metal heat pipes at different insertion depths. The device can ensure that the high-temperature alkali metal heat pipe moves only in the vertical direction and is strictly fixed in the horizontal direction.

[0013] The present invention uses the heat pipe apertures planned and set on the heat pipe fixing plate to test the mutual influence between high-temperature alkali metal heat pipes at different spacings. At the same time, the temperature changes in the graphitization furnace around the high-temperature alkali metal heat pipes under the simultaneous action of a single and multiple high-temperature alkali metal heat pipes are measured to test the actual action range of the high-temperature alkali metal heat pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the high-temperature heat pipe fixing and lowering device used to test the cooling capacity of the graphitization furnace.

[0015] Figure 2 Schematic diagram of the hole layout of the heat pipe fixing plate. DETAILED DESCRIPTION

[0016] The present invention will now be further described with reference to examples and accompanying drawings:

[0017] like Figure 1As shown, the present invention provides a high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace, comprising a hanging cable 1, an instrumentation support 2, a remote-controlled worm motor 3, a motor lifting rod 4, a heat pipe fixing plate 5, an inter-plate connecting rod 6, a high-temperature alkali metal heat pipe 7 and a depth scale 8; the instrumentation support 2 is composed of a rectangular parallelepiped frame and a solid perforated bottom plate, the remote-controlled worm motor 3 is fixed to the bottom plate of the instrumentation support 2, the motor lifting rod 4 passes through the opening, the upper part cooperates with the remote-controlled worm motor 3, and the lower part is connected to the heat pipe fixing plate 5, the hanging cable 1 is connected to the instrumentation support 2, and is used to suspend the entire device on the lifting equipment of the test site; the heat pipe fixing plate 5 is two identical solid perforated stainless steel plates, and the inter-plate connecting rod 6 of equal length connects the two heat pipe fixing plates 5, the high-temperature alkali metal heat pipe 7 passes through the hole of the heat pipe fixing plate 5 and is fixed to the heat pipe fixing plate 5 at the upper end; the depth scale 8 has a significant scale mark and is connected to the bottom of the heat pipe fixing plate 5; the end of the condensation section of the high-temperature alkali metal heat pipe is inserted into the dense graphitization furnace.

[0018] The hanging rope 1, instrumentation and control bracket 2, remote control worm motor 3, and motor lifting rod 4 constitute an instrumentation and control system; the heat pipe fixing plate 5, inter-plate connecting rod 6, high-temperature alkali metal heat pipe 7, and depth scale 8 constitute a cooling system; the remote control worm motor 3 is fixed on the bottom plate of the instrumentation and control bracket 2, and the non-rotating motor lifting rod 4 is used to change the distance between the cooling system and the instrumentation and control system, thereby changing the position of the heat pipe.

[0019] like Figure 2 As shown, as a preferred embodiment of the present invention, the heat pipe fixing plate 5 is composed of two independent circular perforated fixing plates with a thickness of 8 mm and a heat insulation layer on the surface, and is welded together by three inter-plate connecting rods 6. The distance between the two fixing plates is 0.8 m, and the main material is a high-temperature resistant 310S stainless steel plate; three groups of 9 high-temperature alkali metal heat pipe sockets arranged in an equilateral triangle are arranged at relative positions on the upper and lower fixing plates, and the spacing between the high-temperature alkali metal heat pipes in the three groups is 500 mm, 1000 mm, and 1500 mm respectively. A group of 3 heat pipe sockets arranged in a straight line is set on one side edge of the fixing plate, and the center distance between the heat pipes in the group is 460 mm. By adjusting the distribution of the high-temperature alkali metal heat pipes between the openings, the degree of influence of different high-temperature alkali metal heat pipes on the cooling of the graphite furnace can be tested; a number of lifting ears are set on the edge of the heat pipe fixing plate 5 and are equipped with steel cables as redundant safety arrangements to prevent the entire device from accidentally falling.

[0020] As a preferred embodiment of the present invention, the instrumentation and control bracket 2 is composed of a rectangular frame structure with a bottom side length of 1m and a height of 1.1m and a square steel plate with a side length of 1m and a thickness of 10mm. The main material is 304 stainless steel. Four lifting ears are set on the top of the instrumentation and control bracket 2. It is suspended on the lifting equipment at the test site through a hanging rope 1 equipped with a stop plate, so as to realize the overall horizontal movement and a large range of vertical movement of the device.

[0021] As a preferred embodiment of the present invention, the non-rotating motor lifting rod 4 is fixed to the upper surface of the heat pipe fixing plate 5 by a threaded connection, and the forward and reverse operation of the remote-controlled worm motor 3 is used to achieve a cooling system travel range of 1.3m in the vertical direction; the load-bearing capacity of the remote-controlled worm motor 3 should be greater than 700kg, and the bottom plate of the instrumentation and control bracket 2 reserves several holes for arranging the power supply equipment and additional temperature measuring devices of the remote-controlled worm motor 3.

[0022] As a preferred embodiment of the present invention, the depth scale 8 is mainly made of 304 stainless steel, is 130 mm long, and is arranged with markings at 5 cm or 10 cm intervals. The high-temperature alkali metal heat pipe 7 is 2 m long, has an outer diameter of 89 mm, and is mainly made of 310S stainless steel. Conical heads of different angles are arranged at the end of the condensation section of the high-temperature alkali metal heat pipe to facilitate the insertion of the heat pipe into the dense graphitization furnace. A stainless steel protective tube with hanging ears is welded to the evaporation section of the high-temperature alkali metal heat pipe to protect the liquid-filled tube and prevent the high-temperature alkali metal heat pipe from falling and being damaged. The depth scale 8 is flush with the end of the high-temperature alkali metal heat pipe and moves vertically with the cooling system. The insertion depth of the high-temperature alkali metal heat pipe is measured using the markings.

[0023] The operating principle of the present invention is as follows: the entire device is suspended from a test plant crane via a hanging cable 1, securing it in a horizontal position and withstanding reaction forces. The cooling system is vertically moved by the forward and reverse rotation of a remote-controlled worm motor 3, fixed to an instrumentation and control bracket 2. During forward rotation, the entire cooling system moves downward, leveraging the weight of the heat pipe fixing plate 5 and high-temperature alkali metal heat pipe 7 to insert into the graphitization furnace insulation. During reverse rotation, the inter-plate connecting rod 6 removes the cooling system from the insulation, with the reaction forces acting on the crane via the hanging cable 1.

Claims

1. A high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace, characterized by: The invention comprises a hanging rope (1), an instrument control bracket (2), a remote control worm motor (3), a motor lifting rod (4), a heat pipe fixing plate (5), an inter-plate connecting rod (6), a high-temperature alkali metal heat pipe (7) and a depth scale (8); the instrument control bracket (2) is composed of a rectangular parallelepiped frame and a solid bottom plate with a hole, the remote control worm motor (3) is fixed to the bottom plate of the instrument control bracket (2), the motor lifting rod (4) passes through the hole, the upper part cooperates with the remote control worm motor (3), the lower part is connected to the heat pipe fixing plate (5), the hanging rope (1) is connected to the instrument The control bracket (2) is used to suspend the entire device on the lifting equipment of the test site; the heat pipe fixing plate (5) is two identical solid perforated stainless steel plates, and the two heat pipe fixing plates (5) are connected by equal-length inter-plate connecting rods (6); the high-temperature alkali metal heat pipe (7) passes through the holes of the heat pipe fixing plate (5) and is fixed at the upper end to the heat pipe fixing plate (5); the depth scale (8) has a significant scale mark and is connected to the bottom of the heat pipe fixing plate (5); the end of the high-temperature alkali metal heat pipe condensation section is inserted into the dense graphitization furnace.

2. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The hanging rope (1), the instrumentation and control bracket (2), the remote-controlled worm motor (3), and the motor lifting rod (4) constitute the instrumentation and control system; the heat pipe fixing plate (5), the inter-plate connecting rod (6), the high-temperature alkali metal heat pipe (7), and the depth scale (8) constitute the cooling system; the remote-controlled worm motor (3) is fixed on the bottom plate of the instrumentation and control bracket (2); and the non-rotating motor lifting rod (4) is used to change the distance between the cooling system and the instrumentation and control system, thereby changing the position of the heat pipe.

3. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The instrument and control bracket (2) is composed of a rectangular parallelepiped frame structure with a bottom side length of 1m and a height of 1.1m and a square steel plate with a side length of 1m and a thickness of not less than 10mm. The main material is 304 stainless steel. Four lifting ears are set at the top of the instrument and control bracket (2) and are suspended on the lifting equipment at the test site through a hanging rope (1) equipped with a rotation stop plate.

4. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The non-rotating motor lifting rod (4) is fixed to the upper surface of the heat pipe fixing plate (5) through a threaded connection, and a travel range of 1.3m of the cooling system is achieved in the vertical direction through the forward and reverse operation of the remote control worm motor (3); the remote control worm motor (3) has a load-bearing capacity greater than 700kg, and the bottom plate of the instrumentation support (2) retains several holes for arranging the power supply equipment and additional temperature measuring devices of the remote control worm motor (3).

5. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The heat pipe fixing plate (5) is composed of two 8mm thick independent circular opening fixing plates with heat insulation layers on the surface, and is welded together by three inter-plate connecting rods (6). The distance between the two fixing plates is 0.8m, and the main material is a high-temperature resistant 310S stainless steel plate; three groups of 9 high-temperature alkali metal heat pipe sockets arranged in an equilateral triangle are set at relative positions on the upper and lower fixing plates, and the distance between the high-temperature alkali metal heat pipes in the three groups is 500mm, 1000mm, and 1500mm respectively. A group of 3 heat pipe sockets arranged in a straight line is set on the edge of one side of the fixing plate, and the center distance between the heat pipes in the group is 460mm. By adjusting the distribution of the high-temperature alkali metal heat pipes between the openings, the influence of different high-temperature alkali metal heat pipes on the cooling graphite furnace can be tested; a number of lifting ears are set on the edge of the heat pipe fixing plate (5) and a steel cable is provided as a redundant safety arrangement to prevent the entire device from accidentally falling.

6. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The high-temperature alkali metal heat pipe (7) is 2 m long and 89 mm in outer diameter, and is mainly made of 310S stainless steel. Conical heads of different angles are arranged at the end of the condensation section of the high-temperature alkali metal heat pipe to facilitate the insertion of the heat pipe into the dense graphitization furnace. A stainless steel protective tube with a hanging ear is welded to the evaporation section of the high-temperature alkali metal heat pipe to protect the liquid-filled tube and prevent the high-temperature alkali metal heat pipe from falling and being damaged.

7. The high-temperature heat pipe fixed insertion test device for cooling a graphitization furnace according to claim 1, characterized in that: The depth scale (8) is mainly made of 304 stainless steel, is 1.3m long, and is provided with markings at intervals of 5cm or 10cm. The depth scale (8) is flush with the end of the high-temperature alkali metal heat pipe and moves vertically with the cooling system, and the markings are used to measure the insertion depth of the high-temperature alkali metal heat pipe.

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