A square porous crucible for lithium battery negative electrode material and production method thereof

Abstract

The present invention discloses a square porous crucible for negative electrode materials of lithium batteries, including a bottom box, a lifting mechanism, a limiting mechanism, and a hinge mechanism. A rectangular through hole is provided on the top surface of the bottom box, a lifting plate is provided in the rectangular through hole, the lifting plate is connected to the bottom box through the lifting mechanism, a square crucible mold barrel is placed on the top surface of the lifting plate, and the square crucible mold barrel is connected to the lifting plate through the limiting mechanism; a U-shaped bracket is provided above the top surface of the bottom box, a square through hole is provided in the middle of the top surface of the U-shaped bracket, a square box is provided in the square through hole, and a hinge mechanism is provided in the square box. The present invention also discloses a production method of a square porous crucible for negative electrode materials of lithium batteries; the present invention solves the problems of inconvenient pressing of the square porous crucible and loose fixation of the square crucible mold barrel through the coordinated use of various mechanisms, and the overall structural design is compact, which facilitates the adjustment of the jack position according to the size, and facilitates the rapid replacement and limiting fixation of the square crucible mold barrel.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery negative electrode materials, and in particular to a square porous crucible for lithium battery negative electrode materials and a production method thereof. Background Art

[0002] The production of graphite negative electrode materials mainly uses Acheson and internal string graphitization furnaces. The graphite negative electrode materials are loaded into graphite crucibles for graphitization treatment, and the carbon atoms are transformed from the thermodynamically unstable "two-dimensional disordered overlapping" arrangement to the "three-dimensional ordered overlapping" arrangement. At present, domestic manufacturers of graphite negative electrode materials generally use square recycled graphite crucibles. Due to the low production cost of square recycled graphite crucibles, square recycled graphite crucibles are irreplaceable in the process of producing graphite negative electrode materials, so more than 1 million square recycled graphite crucibles will flow into the negative electrode material market every year, and the consumption of square recycled graphite crucibles accounts for more than 20% of the production cost of negative electrode materials.

[0003] The existing square graphite crucible has the following disadvantages during production:

[0004] 1. During the pressing process of the square graphite crucible, the position of the jack should be adjusted according to the size of the square graphite crucible. If the adjustment is not timely, the pressed square crucible may be deformed, cracked, and a large amount of impurities and harmful gases may be released, which will affect the quality of the graphite negative electrode material.

[0005] 2. During the use of the square crucible mold barrel for square graphite crucible, due to the different sizes of square graphite crucibles, the square crucible mold barrel needs to be replaced frequently. Now the square crucible mold barrel is inconvenient to replace, and it is not firmly fixed after replacement, which easily leads to the pressing deviation of the square crucible. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a square porous crucible for lithium battery negative electrode material.

[0007] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0008] A square porous crucible for anode materials of lithium batteries, comprising a bottom box, a lifting mechanism, a limiting mechanism, and a hinge mechanism, wherein the bottom box is a rectangular box placed horizontally, a rectangular through hole is provided on the top surface of the bottom box, a lifting plate placed horizontally is provided in the rectangular through hole, the lifting plate is connected to the bottom box through the lifting mechanism, a square crucible mold cylinder is placed on the top surface of the lifting plate, and the square crucible mold cylinder is connected to the lifting plate through the limiting mechanism;

[0009] A U-shaped bracket with an opening facing downward is provided above the top surface of the bottom box, and two sides of the bottom surface of the U-shaped bracket are respectively fixedly connected to two sides of the top surface of the bottom box, and a square through hole is provided in the middle of the top surface of the U-shaped bracket, and a square box is provided in the square through hole and fixedly passed through, and a hinge mechanism is provided in the square box.

[0010] Preferably, the lifting mechanism includes a positioning rod and an articulated cylinder. Positioning holes are provided on the bottom surface of the bottom box at positions corresponding to the four corners of the lifting plate. Positioning rods are provided on the inner sides of the four corners of the bottom surface of the lifting plate. The bottom ends of the positioning rods slide through the corresponding positioning holes. Articulated cylinders with movably hinged connections are provided at the four corners of the inner bottom surface of the bottom box. The end of the articulated rod of each articulated cylinder is movably hinged to the middle and upper part of the corresponding positioning rod.

[0011] Preferably, a positioning block is provided at the bottom end of the positioning rod below the bottom surface of the bottom box, and a positioning spring is sleeved on the bottom section of the positioning rod between the positioning block and the positioning hole.

[0012] Preferably, the limiting mechanism comprises a telescopic cylinder, an L-shaped rod, and a limiting block. A telescopic cylinder with an output end facing downward is provided in the middle of the bottom surface of the lifting plate. A telescopic connecting block is provided at the end of the telescopic rod of the telescopic cylinder. A pair of longitudinally fixed hinged long plates are provided on both sides of the telescopic connecting block. Both ends of each hinged long plate are provided with a movable hinged L-shaped rod.

[0013] Double-ear seats are provided at the corners of both sides of the lifting plate, each of the double-ear seats is movably hinged to the middle and upper part of the corresponding L-shaped rod, and a trapezoidal clamping block is provided at the top of each L-shaped rod. Limiting blocks are provided at the four corners of the bottom surface of the square crucible mold tube, and a trapezoidal groove is provided on the outer side of each limiting block, and each of the trapezoidal clamping blocks is clamped tightly in the corresponding trapezoidal groove.

[0014] Preferably, a pair of square clamping cylinders are provided in the middle of the bottom surface of the square crucible mold cylinder, a pair of square clamping blocks are provided in the middle of the top surface of the lifting plate, and each of the square clamping blocks is fitted in the corresponding square clamping cylinder.

[0015] Preferably, a first magnet is provided in the middle of the top surface of the square cartridge, a second magnet is provided in the middle of the top surface of the square block, and the first magnet and the second magnet cooperate to attract each other due to opposite polarities.

[0016] Preferably, the hinge mechanism comprises a motor, a rotating disk, and an arc-shaped hinge plate. A fixed bearing is provided in the middle of the bottom surface of the square box, a motor with an output end facing downward is provided in the middle of the top surface of the square box, a coaxially connected linkage shaft is provided at the end of the motor shaft of the motor, and the bottom end of the linkage shaft is inserted in the fixed bearing, and a coaxially fixed rotating disk is sleeved in the middle of the linkage shaft;

[0017] The bottom surface of the square box is evenly distributed with eight radial limit slots, and the middle part of each limit slot is clamped with an I-shaped card block that slides through it. The top of each I-shaped card block is provided with a hinge pin, and the outer side surface of the turntable is evenly distributed with eight movably hinged arc-shaped hinge plates, and the outer end of each arc-shaped hinge plate is movably hinged to the corresponding hinge pin.

[0018] Preferably, a vertically fixed jack main rod is provided in the middle of the bottom surface of the square box, a vertically fixed jack secondary rod is provided in the middle of the bottom surface of each I-shaped card block, and each of the jack main rod and jack secondary rod is inserted in the square crucible mold tube.

[0019] Preferably, support legs are provided at the four corners of the bottom surface of the bottom box, and U-shaped handles are provided at the middle of both side surfaces of the square crucible mold tube.

[0020] The present invention also proposes a method for producing a square porous crucible for a lithium battery negative electrode material, comprising the following steps:

[0021] Step 1: The motor, the articulated cylinder, and the telescopic cylinder are electrically connected to the external power supply through the power cord respectively, a square crucible mold barrel of suitable size is selected, and an appropriate amount of lithium battery negative electrode material is added into the square crucible mold barrel and compacted; the U-shaped handle is held tightly to place the square crucible mold barrel in the center on the top surface of the lifting plate, so that the square clamping blocks are all matched and engaged in the corresponding square clamping barrel, and at the same time, the first magnet and the second magnet cooperate with opposite sex attraction to increase the stability of the square crucible mold barrel when it is placed;

[0022] Step 2: Start the telescopic cylinder and control the telescopic rod of the telescopic cylinder to extend, thereby driving the telescopic connecting block and the hinged long plate to slowly move downward. Under the cooperation of the hinged action, the four L-shaped rods and the double-ear seat are simultaneously driven to be hinged, and the trapezoidal clamping blocks are all clamped and pressed tightly in the corresponding trapezoidal grooves, further increasing the stability of the connection between the square crucible mold barrel and the lifting plate;

[0023] Step three, according to the size of the top opening of the square crucible mold tube, adjust the spacing between the jack auxiliary rods respectively, start the motor, control the motor shaft of the motor to rotate forward or reverse, and then drive the linkage shaft and the turntable to rotate synchronously, and under the cooperation of the hinge action, drive the hinge pin shaft to be hinged through the arc hinge plate, and due to the staggered design of the arc hinge plate and the limit card slot, drive the I-shaped card block to slide along the limit card slot, thereby driving the jack auxiliary rod to be adjusted horizontally;

[0024] Step 4: Start the articulated cylinder, control the articulated rod of the articulated cylinder to extend synchronously, and drive the positioning rod to slide upward along the positioning hole under the cooperation of the articulation action, drive the positioning block to compress the positioning spring upward, and then drive the lifting plate and the square crucible mold barrel to move slowly upward, so that the main jack rod and the auxiliary jack rod are both inserted into the square crucible mold barrel, and are inserted into the negative electrode material in the square crucible mold barrel to form a square porous crucible;

[0025] Step 5: After the above steps are completed, repeat steps 4 and 2 in reverse, take out the square crucible mold tube and pour out the square porous crucible.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, according to the size of the top opening of the square crucible mold cylinder, the spacing between the jack auxiliary rods is adjusted respectively, and the motor shaft of the motor is controlled to rotate forward or reverse, thereby driving the linkage shaft and the turntable to rotate synchronously, and the arc-shaped hinge plate drives the hinge pin to be movable and hinged. Due to the staggered design of the arc-shaped hinge plate and the limit card slot, the I-shaped card block is driven to slide along the limit card slot, and the jack auxiliary rod is driven to be adjusted horizontally, which facilitates the adjustment of the jack position according to the size;

[0028] 2. In the present invention, the U-shaped handle is gripped to place the square crucible mold barrel in the center on the top surface of the lifting plate, so that the square clamping blocks are all engaged in the corresponding square clamping barrels, and the first magnet and the second magnet cooperate with opposite sex attraction to control the extension of the telescopic rod of the telescopic cylinder, thereby driving the telescopic connecting block and the hinged long plate to slowly move downward, and at the same time drive the four L-shaped rods and the double-ear seat to be hinged, drive the trapezoidal clamping blocks to be engaged and pressed tightly in the corresponding trapezoidal grooves, and further increase the stability of the connection between the square crucible mold barrel and the lifting plate;

[0029] In summary, the present invention solves the problems of inconvenient pressing of the square porous crucible and loose fixation of the square crucible mold tube through the coordinated use of various mechanisms, and the overall structural design is compact, which facilitates the adjustment of the jack position according to the size and the rapid replacement and limit fixation of the square crucible mold tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 It is a front view schematic diagram of the present invention;

[0032] Figure 2 It is a front cross-sectional schematic diagram of the present invention;

[0033] Figure 3It is a schematic diagram of a transverse cross-section of the middle part of a square box of the present invention;

[0034] Figure 4 It is a front cross-sectional schematic diagram of a square crucible mold tube of the present invention;

[0035] Figure 5 It is a top view schematic diagram of the lifting plate of the present invention;

[0036] Figure 6 For the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0037] Figure 7 For the present invention Figure 2 The enlarged schematic diagram of point B in the middle;

[0038] Figure 8 It is a schematic diagram of the production method of the present invention;

[0039] Serial numbers in the figure: bottom box 1, lifting plate 11, articulated cylinder 12, positioning rod 13, positioning spring 14, telescopic cylinder 15, articulated long plate 16, L-shaped rod 17, double-ear seat 18, trapezoidal block 19, square crucible mold tube 2, limit block 21, U-shaped handle 22, square clamping tube 23, first magnet 24, square block 25, second magnet 26, U-shaped bracket 3, square box 31, motor 32, linkage shaft 33, turntable 34, arc-shaped hinge plate 35, hinge pin 36, limit slot 37, I-shaped block 38, jack auxiliary rod 39, jack main rod 310. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] Example 1: This example provides a square porous crucible for lithium battery negative electrode material, see Figure 1-7 Specifically, it includes a bottom box 1, a lifting mechanism, a limiting mechanism, and a hinge mechanism. The bottom box 1 is a rectangular box placed horizontally. A rectangular through hole is opened on the top surface of the bottom box 1, and a horizontally placed lifting plate 11 is arranged in the rectangular through hole. The lifting plate 11 is connected to the bottom box 1 through the lifting mechanism. A square crucible mold tube 2 is placed on the top surface of the lifting plate 11, and the square crucible mold tube 2 is connected to the lifting plate 11 through the limiting mechanism; a U-shaped bracket 3 with an opening facing downward is arranged above the top surface of the bottom box 1, and the two sides of the bottom surface of the U-shaped bracket 3 are respectively fixed to the two sides of the top surface of the bottom box 1, a square through hole is opened in the middle of the top surface of the U-shaped bracket 3, and a square box 31 is fixedly connected through the square through hole, and a hinge mechanism is arranged in the square box 31, and supporting legs are arranged at the four corners of the bottom surface of the bottom box 1, and U-shaped handles 22 are arranged in the middle of both sides of the square crucible mold tube 2.

[0042] In the present invention, the limiting mechanism includes a telescopic cylinder 15, an L-shaped rod 17, and a limiting block 21. The middle part of the bottom surface of the lifting plate 11 is provided with a telescopic cylinder 15 with an output end facing downward. The model of the telescopic cylinder 15 is HR6000. The end of the telescopic rod of the telescopic cylinder 15 is provided with a telescopic connecting block. The two sides of the telescopic connecting block are provided with a pair of longitudinally fixed hinged long plates 16. Both ends of each hinged long plate 16 are provided with a movable hinged L-shaped rod 17; the corners of the two sides of the lifting plate 11 are provided with double-ear seats 18, each double-ear seat 18 is movably hinged to the middle and upper part of the corresponding L-shaped rod 17, and each L The top of the L-shaped rod 17 is provided with a trapezoidal block 19, and the four corners of the bottom surface of the square crucible mold tube 2 are provided with a limit block 21. The outer side of each limit block 21 is provided with a trapezoidal groove, and each trapezoidal block 19 is clamped and pressed tightly in the corresponding trapezoidal groove; the telescopic rod of the telescopic cylinder 15 is controlled to extend, thereby driving the telescopic connecting block and the hinged long plate 16 to slowly move downward, and at the same time driving the four L-shaped rods 17 and the double-ear seat 18 to be movably hinged, driving the trapezoidal blocks 19 to be clamped and pressed tightly in the corresponding trapezoidal groove, further increasing the stability of the connection between the square crucible mold tube 2 and the lifting plate 11.

[0043] In the present invention, a pair of square cartridges 23 are provided in the middle of the bottom surface of the square crucible mold tube 2, and a pair of square blocks 25 are provided in the middle of the top surface of the lifting plate 11, and each square block 25 is fitted in the corresponding square cartridge 23; a first magnet 24 is provided in the middle of the top surface of the square cartridge 23, and a second magnet 26 is provided in the middle of the top surface of the square block 25, and the first magnet 24 and the second magnet 26 are attracted to each other by opposite charges; the U-shaped handle 22 is held tightly to place the square crucible mold tube 2 in the center on the top surface of the lifting plate 11, so that the square blocks 25 are fitted in the corresponding square cartridges 23, and at the same time, the first magnet 24 and the second magnet 26 are attracted to each other by opposite charges, which increases the stability of the square crucible mold tube 2 when it is placed.

[0044] In the present invention, the hinge mechanism includes a motor 32, a turntable 34, and an arc-shaped hinge plate 35. A fixed bearing is provided in the middle of the bottom surface of the square box 31, and a motor 32 with an output end facing downward is provided in the middle of the top surface of the square box 31. The model of the motor 32 is YX3-112M-4. A coaxially connected linkage shaft 33 is provided at the end of the motor shaft of the motor 32, and the bottom end of the linkage shaft 33 is inserted in the fixed bearing, and a concentrically fixed turntable 34 is sleeved in the middle of the linkage shaft 33; eight radial limit slots 37 are evenly distributed on the bottom surface of the square box 31, and an I-shaped card block 38 that slides through the middle of each limit slot 37 is engaged, and a hinge pin 36 is provided on the top of each I-shaped card block 38, and eight movable hinged arc-shaped hinge plates 35 are evenly distributed on the outer side of the turntable 34, and the outer end of each arc-shaped hinge plate 35 is connected to the opposite The corresponding hinge pin 36 is movably hinged; a vertically fixed jack main rod 310 is provided in the middle of the bottom surface of the square box 31, and a vertically fixed jack sub-rod 39 is provided in the middle of the bottom surface of each I-shaped card block 38. Each jack main rod 310 and jack sub-rod 39 are inserted in the square crucible mold tube 2. According to the size of the top surface opening of the square crucible mold tube 2, the spacing between the jack sub-rods 39 is adjusted respectively, and the motor 32 is started to control the motor shaft of the motor 32 to rotate forward or reverse, thereby driving the linkage shaft 33 and the turntable 34 to rotate synchronously. Under the cooperation of the hinge action, the hinge pin 36 is driven to be movably hinged through the arc-shaped hinge plate 35. Due to the staggered design of the arc-shaped hinge plate 35 and the limit card slot 37, the I-shaped card block 38 is driven to slide along the limit card slot 37, thereby driving the jack sub-rod 39 to be adjusted laterally.

[0045] Embodiment 2: In embodiment 1, there is still the problem that the square crucible mold barrel is inconvenient to lift and lower. Therefore, based on embodiment 1, this embodiment also includes:

[0046] In the present invention, the lifting mechanism includes a positioning rod 13 and an articulated cylinder 12. Positioning holes are provided on the bottom surface of the bottom box 1 at the positions corresponding to the four corners of the lifting plate 11. Positioning rods 13 are provided on the inner sides of the four corners of the bottom surface of the lifting plate 11. The bottom ends of the positioning rods 13 slide through the corresponding positioning holes. Articulated cylinders 12 with movable hinges are provided at the four corners of the bottom surface of the bottom box 1. The model of the articulated cylinder 12 is LSH-064. The end of the articulated rod of each articulated cylinder 12 is movably articulated with the middle and upper part of the corresponding positioning rod 13. A positioning block is provided at the bottom end of 13, and a positioning spring 14 is sleeved on the bottom section of the positioning rod 13 between the positioning block and the positioning hole; the articulated rod of the articulated cylinder 12 is controlled to extend synchronously, and under the cooperation of the articulation action, the positioning rod 13 is driven to slide upward along the positioning hole, and the positioning block is driven to compress the positioning spring 14 upward, thereby driving the lifting plate 11 and the square crucible mold tube 2 to move slowly upward, so that the main jack rod 310 and the auxiliary jack rod 39 are both inserted into the square crucible mold tube 2, and inserted into the negative electrode material in the square crucible mold tube 2 to form a square porous crucible.

[0047] Example 3: See Figure 8 In this embodiment, the present invention also proposes a method for producing a square porous crucible for a lithium battery negative electrode material, comprising the following steps:

[0048] Step 1: The motor 32, the articulated cylinder 12, and the telescopic cylinder 15 are electrically connected to the external power supply through the power cord respectively, and a square crucible mold tube 2 of a suitable size is selected, and an appropriate amount of lithium battery negative electrode material is added to the square crucible mold tube 2 and compacted; the U-shaped handle 22 is held tightly to place the square crucible mold tube 2 in the center on the top surface of the lifting plate 11, so that the square clamping blocks 25 are all matched and engaged in the corresponding square clamping tube 23, and at the same time, the first magnet 24 and the second magnet 26 cooperate with opposite sex attraction, which increases the stability of the square crucible mold tube 2 when it is placed;

[0049] Step 2: Start the telescopic cylinder 15, control the telescopic rod of the telescopic cylinder 15 to extend, and then drive the telescopic connecting block and the hinged long plate 16 to slowly move downward. Under the cooperation of the hinged action, the four L-shaped rods 17 and the double-ear seat 18 are simultaneously driven to be hinged, and the trapezoidal clamping blocks 19 are all clamped and pressed tightly in the corresponding trapezoidal grooves, further increasing the stability of the connection between the square crucible mold tube 2 and the lifting plate 11;

[0050] Step three, according to the size of the top opening of the square crucible mold tube 2, the spacing between the jack auxiliary rods 39 is adjusted respectively, the motor 32 is started, and the motor shaft of the motor 32 is controlled to rotate forward or reversely, thereby driving the linkage shaft 33 and the turntable 34 to rotate synchronously, and under the cooperation of the hinge action, the hinge pin 36 is driven to be hinged by the arc hinge plate 35. Due to the staggered design of the arc hinge plate 35 and the limit card slot 37, the I-shaped card block 38 is driven to slide along the limit card slot 37, thereby driving the jack auxiliary rod 39 to be adjusted laterally;

[0051] Step 4: Start the articulated cylinder 12, control the articulated rod of the articulated cylinder 12 to extend synchronously, and drive the positioning rod 13 to slide upward along the positioning hole under the cooperation of the articulation action, drive the positioning block to compress the positioning spring 14 upward, and then drive the lifting plate 11 and the square crucible mold tube 2 to move slowly upward, so that the main jack rod 310 and the auxiliary jack rod 39 are both inserted into the square crucible mold tube 2, and inserted into the negative electrode material in the square crucible mold tube 2 to form a square porous crucible;

[0052] Step 5: After the above steps are completed, repeat steps 4 and 2 in reverse, take out the square crucible mold tube 2 and pour out the square porous crucible.

[0053] The present invention solves the problems of inconvenient pressing of the square porous crucible and loose fixation of the square crucible mold barrel through the coordinated use of various mechanisms, and the overall structure is compactly designed, which facilitates adjustment of the jack position according to the size and facilitates rapid replacement and position-limiting fixation of the square crucible mold barrel.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A square porous crucible for lithium battery negative electrode material, comprising a bottom box (1), a lifting mechanism, a limiting mechanism, and a hinge mechanism, characterized in that: The bottom box (1) is in the shape of a rectangular box placed horizontally, the top surface of the bottom box (1) is provided with a rectangular through hole, a horizontally placed lifting plate (11) is provided in the rectangular through hole, the lifting plate (11) is connected to the bottom box (1) via a lifting mechanism, a square crucible mold cylinder (2) is placed on the top surface of the lifting plate (11), and the square crucible mold cylinder (2) is connected to the lifting plate (11) via a limiting mechanism; A U-shaped bracket (3) with an opening facing downward is provided above the top surface of the bottom box (1); two sides of the bottom surface of the U-shaped bracket (3) are respectively fixedly connected to two sides of the top surface of the bottom box (1); a square through hole is provided in the middle of the top surface of the U-shaped bracket (3); a square box (31) is provided in the square through hole and is fixedly connected therethrough; a hinge mechanism is provided in the square box (31); The limiting mechanism comprises a telescopic cylinder (15), an L-shaped rod (17), and a limiting block (21); a telescopic cylinder (15) with an output end facing downward is provided in the middle of the bottom surface of the lifting plate (11); a telescopic connecting block is provided at the end of the telescopic rod of the telescopic cylinder (15); a pair of longitudinally fixed hinged long plates (16) are provided on both sides of the telescopic connecting block; and each of the hinged long plates (16) is provided with a movable hinged L-shaped rod (17) at both ends; The lifting plate (11) is provided with double-ear seats (18) at the corners of both sides, each of the double-ear seats (18) is movably hinged to the middle and upper part of the corresponding L-shaped rod (17), and the top of each L-shaped rod (17) is provided with a trapezoidal clamping block (19), and the bottom surface of the square crucible mold tube (2) is provided with a limit block (21) at four corners, and the outer side surface of each limit block (21) is provided with a trapezoidal groove, and each of the trapezoidal clamping blocks (19) is clamped and pressed tightly in the corresponding trapezoidal groove; A pair of square clamping cylinders (23) are provided in the middle of the bottom surface of the square crucible mold cylinder (2), and a pair of square clamping blocks (25) are provided in the middle of the top surface of the lifting plate (11), and each of the square clamping blocks (25) is matched and clamped in the corresponding square clamping cylinder (23); A first magnet (24) is provided in the middle of the top surface of the square cartridge (23), a second magnet (26) is provided in the middle of the top surface of the square clamping block (25), and the first magnet (24) and the second magnet (26) attract each other due to their opposite polarities.

2. A square porous crucible for lithium battery negative electrode material according to claim 1, characterized in that: The lifting mechanism comprises a positioning rod (13) and an articulated cylinder (12). Positioning holes are provided on the bottom surface of the bottom box (1) at positions corresponding to the four corners of the lifting plate (11). Positioning rods (13) are provided on the inner sides of the four corners of the bottom surface of the lifting plate (11). The bottom ends of the positioning rods (13) slide through the corresponding positioning holes. Articulated cylinders (12) with movable hinges are provided at the four corners of the inner bottom surface of the bottom box (1). The end of the articulated rod of each articulated cylinder (12) is movably articulated with the middle and upper part of the corresponding positioning rod (13).

3. A square porous crucible for lithium battery negative electrode material according to claim 2, characterized in that: A positioning block is provided at the bottom end of the positioning rod (13) below the bottom surface of the bottom box (1), and a positioning spring (14) is sleeved on the bottom section of the positioning rod (13) between the positioning block and the positioning hole.

4. The square porous crucible for lithium battery negative electrode material according to claim 1, characterized in that: The hinge mechanism comprises a motor (32), a rotating disk (34), and an arc-shaped hinge plate (35); a fixed bearing is provided in the middle of the inner bottom surface of the square box (31); a motor (32) with an output end facing downward is provided in the middle of the inner top surface of the square box (31); a coaxially connected linkage shaft (33) is provided at the end of the motor shaft of the motor (32); the bottom end of the linkage shaft (33) is inserted into the fixed bearing; and a coaxially fixed rotating disk (34) is sleeved in the middle of the linkage shaft (33); The bottom surface of the square box (31) is evenly provided with eight radial limit slots (37), and an I-shaped card block (38) is slidably inserted into the middle of each limit slot (37), and a hinge pin (36) is provided at the top of each I-shaped card block (38). The outer side surface of the rotating disk (34) is evenly provided with eight movably hinged arc-shaped hinge plates (35), and the outer end of each arc-shaped hinge plate (35) is movably hinged to the corresponding hinge pin (36).

5. A square porous crucible for lithium battery negative electrode material according to claim 4, characterized in that: A vertically fixed socket main rod (310) is provided in the middle of the bottom surface of the square box (31), and a vertically fixed socket auxiliary rod (39) is provided in the middle of the bottom surface of each I-shaped card block (38). Each of the socket main rod (310) and the socket auxiliary rod (39) is inserted into the square crucible mold tube (2).

6. The square porous crucible for lithium battery negative electrode material according to claim 1, characterized in that: Support legs are provided at the four corners of the bottom surface of the bottom box (1), and U-shaped handles (22) are provided at the middle of both side surfaces of the square crucible mold tube (2).

7. The method for producing a square porous crucible for a negative electrode material of a lithium battery according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: The motor (32), the articulated cylinder (12), and the telescopic cylinder (15) are electrically connected to an external power supply through power cords, respectively, a square crucible mold tube (2) of suitable size is selected, and a proper amount of lithium battery negative electrode material is added into the square crucible mold tube (2) and compacted; the U-shaped handle (22) is gripped to place the square crucible mold tube (2) in the center on the top surface of the lifting plate (11), so that the square clamping blocks (25) are all matched and engaged in the corresponding square clamping tube (23); at the same time, the first magnet (24) and the second magnet (26) cooperate with opposite charges to attract each other, thereby increasing the stability of the square crucible mold tube (2) when it is placed; Step 2: Start the telescopic cylinder (15), control the telescopic rod of the telescopic cylinder (15) to extend, thereby driving the telescopic connecting block and the hinged long plate (16) to slowly move downward, and under the cooperation of the hinged action, drive the four L-shaped rods (17) and the double-ear seat (18) to be hinged, drive the trapezoidal clamping blocks (19) to be clamped and pressed tightly in the corresponding trapezoidal grooves, and further increase the stability of the connection between the square crucible mold tube (2) and the lifting plate (11); Step three, according to the size of the top opening of the square crucible mold tube (2), the spacing between the jack auxiliary rods (39) is adjusted respectively, the motor (32) is started, and the motor shaft of the motor (32) is controlled to rotate in the forward or reverse direction, thereby driving the linkage shaft (33) and the turntable (34) to rotate synchronously, and under the cooperation of the hinge action, the hinge pin shaft (36) is driven to be hinged through the arc hinge plate (35), and due to the staggered design of the arc hinge plate (35) and the limit slot (37), the I-shaped card block (38) is driven to slide along the limit slot (37), thereby driving the jack auxiliary rod (39) to be adjusted laterally; Step 4, starting the articulated cylinder (12), controlling the articulated rod of the articulated cylinder (12) to extend synchronously, and under the cooperation of the articulated action, driving the positioning rod (13) to slide upward along the positioning hole, driving the positioning block to compress the positioning spring (14) upward, and then driving the lifting plate (11) and the square crucible mold tube (2) to move slowly upward, so that the main jack rod (310) and the auxiliary jack rod (39) are both inserted into the square crucible mold tube (2), and inserted into the negative electrode material in the square crucible mold tube (2) to form a square porous crucible; Step 5: After the above steps are completed, repeat steps 4 and 2 in reverse, take out the square crucible mold tube (2) and pour out the square porous crucible.

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