Aluminum phosphide tablet calcining furnace

Abstract

The utility model relates to the technical field of aluminum phosphide production, in particular to an aluminum phosphide tablet calcining furnace which comprises a calcining furnace body, a hearth arranged in the calcining furnace body, a furnace door hinged to the vertical side wall of the calcining furnace body, a placing plate horizontally and fixedly connected to the lower portion of the inner side wall of the furnace door, and a circular positioning groove formed in the top of the placing plate. A material mixing box is fixedly connected to the top of the calcining furnace body, the circumferential inner wall of the lower end of the material mixing box is of an inverted-cone-shaped structure, a channel is formed in the middle of the top face of the calcining furnace body, a feeding piece is arranged on the left side of the material mixing box, and a material mixing piece is arranged on the right side of the material mixing box; and a blocking piece for blocking the channel is arranged at the top of the calcining furnace body. The utility model has the following beneficial effects: the mixing uniformity of a mixture is greatly improved; automatic discharging of the aluminum powder and red phosphorus mixture is achieved, dust is prevented from hurting the body health of operators, and the closeness of the calcining furnace body is guaranteed. And the operation safety is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum phosphide production, in particular to a calcination furnace for aluminum phosphide tablets. Background Art

[0002] In the production process of aluminum phosphide tablets, first, aluminum powder and red phosphorus are mixed in a certain ratio and introduced into a firing tank. Then, the tank body is placed in a reaction chamber and the mixture is subjected to high-temperature calcination. The aluminum phosphide crude drug obtained after high-temperature calcination is added with paraffin for solidification, and then the solid block is crushed into aluminum phosphide crude powder. After that, ammonium carbamate and talcum powder are added to the crude powder, and the mixture is stirred evenly to obtain semi-finished granules. Finally, the semi-finished granules are pressed into sheets to obtain aluminum phosphide tablets.

[0003] Among them, in order to complete the process of high-temperature calcination reaction to generate aluminum phosphide crude drug, the calcination furnace is particularly important.

[0004] For example, in the patent document with the patent publication number CN212076421U, a calcination device for aluminum phosphide tablets is disclosed. It includes a reaction chamber, in which a firing tank is inserted. The left side of the firing tank is fixedly connected to a driving motor through a motor support plate. The output end of the driving motor is fixedly connected to a crankshaft. The right end of the crankshaft penetrates and extends into the interior of the firing tank. An eccentric shaft is arranged on the outer surface of the crankshaft. A sleeve is sleeved on the outer surface of the eccentric shaft. The lower surface of the sleeve is fixedly connected to a rocker. A group of stirring blades are fixedly connected to the outer surface of the crankshaft. Two limiting rods are fixedly connected to the inner bottom wall of the firing tank. Limiting sleeves are sleeved on the outer surfaces of the two limiting rods. A connecting rod is fixedly connected to the opposite sides of the two limiting sleeves. The upper surface of the connecting rod is hinged to the bottom end of the rocker. A group of longitudinal compaction plates are fixedly connected to the lower surface of the connecting rod. A feeding pipe is inserted between the firing tank and the reaction chamber. A piston plate is arranged inside the feeding pipe. The lower surface of the reaction chamber is fixedly connected to a mounting frame. An electric push rod is fixedly connected inside the mounting frame. The output end of the electric push rod is fixedly connected to a push rod through a connecting plate. The top end of the push rod extends into the interior of the feeding pipe. The top end of the push rod is fixedly connected to the lower surface of the piston plate.

[0005] It can be seen from the existing technical literature that although this device can realize the calcination preparation of aluminum phosphide, simply relying on the stirring blades to mix the aluminum powder and red phosphorus, the mixing effect is poor, and the longitudinal compaction plates may also block the feeding of the aluminum powder and red phosphorus, further affecting the mixing effect of the two according to a fixed ratio. Secondly, after the calcination is completed, the obtained aluminum phosphide is prone to accumulate at the corner positions inside the firing tank body, and this device lacks effective measures to deal with it, which will cause great inconvenience to the feeding of aluminum phosphide. At the same time, since the electric push rod and the push rod are arranged inside the feeding pipe, this will interfere with the feeding of aluminum phosphide, further reducing the feeding convenience of aluminum phosphide.

[0006] To this end, the present utility model optimizes and improves the problem of inconvenient material taking of aluminum phosphide in the prior art, and hereby proposes a new type of calcining furnace for producing aluminum phosphide tablets to better solve the problems in the prior art. Content of the utility model

[0007] One of the technical solutions adopted by the present utility model to solve the above technical problems is: an aluminum phosphide tablet calcining furnace, including a calcining furnace body, a hearth is arranged inside the calcining furnace body, a furnace door is hingedly connected to the vertical side wall of the calcining furnace body, a placing plate is horizontally fixedly connected to the lower part of the inner side wall of the furnace door, a circular positioning groove is opened at the top of the placing plate, and a firing pot is further included. The lower end of the firing pot is clamped and arranged in the circular positioning groove. A mixing box is fixedly connected to the top of the calcining furnace body. The circumferential inner wall of the lower end of the mixing box is of an inverted conical structure. A channel for communicating the inner cavities of the mixing box and the hearth is opened in the middle of the top surface of the calcining furnace body. A feeding member is arranged on the left side of the mixing box, a mixing member is arranged on the right side of the mixing box, and a blocking member for blocking the channel is arranged on the top of the calcining furnace body.

[0008] In any of the above solutions, preferably, the feeding member includes a horizontally arranged feeding pipe. The left end of the feeding pipe is closed and the right end is open. The feeding pipe is fixedly inserted into the mounting hole on the left wall of the mixing box and extends into its inner cavity. A screw conveyor is coaxially arranged along the length direction inside the feeding pipe. The left end of the rotating shaft of the screw conveyor is movably inserted into the rotating hole on the left end surface of the feeding pipe and extends to the outside thereof. A first motor fixedly arranged is further included. The motor shaft of the first motor is coaxially fixedly connected to the left end of the rotating shaft of the screw conveyor. A feeding hopper is fixedly connected to the top of the left end of the feeding pipe. A feeding port is opened at the corresponding position on the top of the left end of the feeding pipe. The feeding port is used for communicating the inner cavities of the feeding hopper and the feeding pipe.

[0009] In any of the above solutions, preferably, the mixing member includes a cylindrical mixing sieve. The mixing sieve is horizontally arranged in the inner cavity of the mixing box. The right end of the mixing sieve is closed and the left end is open. A plurality of material leakage holes are evenly spaced on the circumferential surface of the mixing sieve. The right end of the feeding pipe is coaxially inserted into the inner cavity of the mixing sieve. A central shaft is coaxially fixedly connected to the right end surface of the mixing sieve. The right end of the central shaft is movably inserted into the rotating hole on the right wall of the mixing box and extends to the outside thereof. A second motor fixedly arranged is further included. The motor shaft of the second motor is coaxially fixedly connected to the right end of the central shaft.

[0010] Preferably, in any of the above solutions, the plugging member includes a chute, a limiting hole, and a positioning groove arranged inside the top of the calcination furnace body. The chute, the limiting hole, and the positioning groove are connected in series and communicated with each other in the horizontal direction from left to right in sequence. The chute passes through the channel. A plugging block for plugging the channel is movably arranged in the chute. A push rod is fixedly connected to the right end of the plugging block. The right end of the push rod passes through the limiting hole and extends into the positioning groove. A holding rod is movably arranged in the positioning groove. The lower end of the holding rod is fixedly connected to the right end of the push rod. The upper end of the holding rod passes through the positioning groove and extends above the calcination furnace body.

[0011] Preferably, in any of the above solutions, an external thread is provided on the outer surface of the circumferential direction of the holding rod. A matching hexagonal nut is further included. The hexagonal nut is threadedly connected to the holding rod. The bottom of the hexagonal nut presses against the top of the calcination furnace body.

[0012] Preferably, in any of the above solutions, the diameter of the channel gradually increases from top to bottom along its axial direction.

[0013] Preferably, in any of the above solutions, a clamping portion is integrally formed along the circumferential direction at the upper end of the firing pot.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model transports aluminum powder and red phosphorus to the rotating mixing sieve through a screw conveyor, and then drives the two to continuously collide and mix inside the mixing sieve through the mixing sieve. Large particles gradually become small particles and are effectively mixed. Then, the mixture is leaked out of the mixing sieve through the leakage holes, thereby greatly improving the mixing uniformity of the mixture and being more conducive to the reaction of the two in the calcination furnace body.

[0016] 2. The present utility model can drive the plugging block to move in the chute by pushing and pulling the holding rod, thereby realizing the flexible control of the communication state between the mixing box and the calcination furnace body. It not only realizes the automatic feeding of the aluminum powder and red phosphorus mixture, avoids dust from harming the health of operators, but also ensures the sealing of the calcination furnace body and avoids heat dissipation.

[0017] 3. The present utility model is provided with a placement plate for positioning and placing the firing pot on the furnace door. In this way, when the furnace door is opened, the firing pot can be directly taken out of the furnace chamber, which is convenient for operators to observe the reaction of aluminum powder and red phosphorus. When the reaction of the two is insufficient, the firing pot can be directly sent back into the furnace chamber by closing the furnace door. The whole process does not require clamping the firing pot through a clamping hook, avoiding the occurrence of scalding situations and greatly improving the operation safety.

[0018] 4. The bottom surface of the mixing box of the present utility model is inclined, which can facilitate the feeding of the mixture of aluminum powder and red phosphorus. At the same time, the channel is narrow at the top and wide at the bottom, which can effectively prevent the mixture of the two from accumulating in the chute.

[0019] 5. The present utility model is provided with a clamping part at the top of the firing tank, which can quickly take out the firing tank through a special hook claw and realize the dumping of the reaction product aluminum phosphide, thereby improving the convenience of taking out aluminum phosphide. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the specific embodiments of the present utility model, the following will briefly introduce the drawings required for the specific embodiments. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0021] Figure 1 It is the front view of the calciner of the present utility model.

[0022] Figure 2 It is the front view of the calciner of the present utility model with the furnace door open.

[0023] Figure 3 It is the top view cross-sectional view of the present utility model with the furnace door open.

[0024] Figure 4 It is the partial cross-sectional view of the calciner of the present utility model in the front view direction.

[0025] Figure 5 It is the internal structure diagram of the mixing box of the present utility model.

[0026] Figure 6 It is the connection structure schematic diagram of the plugging member of the present utility model in the front view direction.

[0027] Figure 7 It is the layout diagram of the channel, chute, limiting hole and positioning groove of the present utility model.

[0028] Figure 8 It is the front view of the mixing sieve of the present utility model.

[0029] In the figure, 1. Calciner body; 2. Hearth; 3. Furnace door; 4. Placing plate; 5. Circular positioning groove; 6. Firing tank; 7. Mixing box; 8. Channel; 9. Feeding pipe; 10. Screw conveyor; 11. First motor; 12. Feeding hopper; 13. Feeding port; 14. Mixing sieve; 15. Central shaft; 16. Second motor; 17. Leakage hole; 18. Chute; 19. Limiting hole; 20. Positioning groove; 21. Plugging block; 22. Push rod; 23. Holding rod; 24. Hexagonal nut; 25. Clamping part. SPECIFIC EMBODIMENTS

[0030] The embodiments of the technical solutions of the present utility model will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model. The specific structure of the present utility model is as Figures 1 - 8 shown in

[0031] An aluminum phosphide tablet calcination furnace, comprising a calcination furnace body 1, a furnace chamber 2 is arranged inside the calcination furnace body 1, a furnace door 3 is hingedly connected to the vertical side wall of the calcination furnace body 1, a placement plate 4 is horizontally fixedly connected to the lower part of the inner side wall of the furnace door 3, a circular positioning groove 5 is opened at the top of the placement plate 4, and further comprises a firing pot 6, the lower end of the firing pot 6 is clamped and arranged in the circular positioning groove 5, a mixing box 7 is fixedly connected to the top of the calcination furnace body 1, the circumferential inner wall of the lower end of the mixing box 7 is of an inverted conical structure, a channel 8 for communicating the inner cavities of the mixing box 7 and the furnace chamber 2 is opened in the middle of the top surface of the calcination furnace body 1, a feeding member is arranged on the left side of the mixing box 7, a mixing member is arranged on the right side of the mixing box 7, and a blocking member for blocking the channel 8 is arranged on the top of the calcination furnace body 1.

[0032] An anti-scalding handle is arranged on the outer wall of the furnace door 3, and a placement plate 4 is arranged on its inner wall. The firing pot 6 is placed in the circular positioning groove 5 at the top of the placement plate 4, so that the firing pot 6 can enter and exit the furnace chamber 2 correspondingly through the opening and closing of the furnace door 3. The mixing box 7 and the furnace chamber 2 are communicated through the channel 8. At the same time, when the furnace door 3 is closed, the firing pot 6 is just located directly below the channel 8. In this way, aluminum powder and red phosphorus are added into the mixing box 7 through the feeding member, and then the two are uniformly mixed through the mixing member, and the mixture can directly leak into the interior of the firing pot 6 through the channel 8, and then it is calcined. In order to prevent the heat inside the furnace chamber 2 from dissipating through the channel 8 during calcination, a blocking member is arranged on the top of the calcination furnace body 1, so as to flexibly control the communication state between the mixing box 7 and the furnace chamber 2.

[0033] In any of the above solutions, preferably, the feeding member comprises a horizontally arranged feeding pipe 9, the left end of the feeding pipe 9 is closed and its right end is open, the feeding pipe 9 is fixedly inserted into the mounting hole on the left wall of the mixing box 7 and extends into its inner cavity, a auger 10 is coaxially arranged along the length direction inside the feeding pipe 9, the left end of the rotating shaft of the auger 10 is movably inserted into the rotating hole on the left end face of the feeding pipe 9 and extends to its outside, and further comprises a fixedly arranged first motor 11, the motor shaft of the first motor 11 is coaxially fixedly connected to the left end of the rotating shaft of the auger 10, a feeding hopper 12 is fixedly connected to the top of the left end of the feeding pipe 9, and a feeding port 13 is opened at the corresponding position at the top of the left end of the feeding pipe 9, and the feeding port 13 is used for communicating the inner cavities of the feeding hopper 12 and the feeding pipe 9.

[0034] The first motor 11 is fixedly installed on the left outer wall of the mixing tank 7 through a motor bracket. Its motor shaft is coaxially and fixedly connected to the left end of the rotating shaft of the auger 10 through a coupling, thereby driving the auger 10 to rotate in the feeding pipe 9. The operator adds aluminum powder and red phosphorus into the interior of the feeding hopper 12 according to a certain ratio. Driven by the rotation of the auger 10, the two enter the interior of the mixing tank 7 and complete the mixing process.

[0035] In any of the above solutions, preferably, the mixing member includes a cylindrical mixing screen 14. The mixing screen 14 is horizontally arranged in the inner cavity of the mixing tank 7. The right end of the mixing screen 14 is closed and its left end is open. A plurality of leakage holes 17 are evenly spaced on the circumferential surface of the mixing screen 14. The right end of the feeding pipe 9 is coaxially inserted into the inner cavity of the mixing screen 14. A central shaft 15 is coaxially and fixedly connected to the right end face of the mixing screen 14. The right end of the central shaft 15 is movably inserted into a rotating hole on the right wall of the mixing tank 7 and extends to its outside. It also includes a fixedly arranged second motor 16. The motor shaft of the second motor 16 is coaxially and fixedly connected to the right end of the central shaft 15.

[0036] The second motor 16 is fixedly installed on the right outer wall of the mixing tank 7 through a motor bracket. Its motor shaft is coaxially and fixedly connected to the right end of the central shaft 15 through a coupling, thereby driving the central shaft 15 to rotate, and ultimately realizing the rotation of the mixing screen 14. The right end of the feeding pipe 9 extends from the left end of the mixing screen 14 to its interior. In this way, aluminum powder and red phosphorus can be conveyed into the interior of the mixing screen 14 under the driving of the rotation of the auger 10 and the guiding action of the feeding pipe 9. In this way, the two can continuously rotate inside the mixing screen 14, thereby quickly completing the mixing and ensuring the uniform mixing of the two. At the same time, the mixture of the two can continuously leak out from each leakage hole 17 and fall to the bottom of the mixing tank 7.

[0037] In any of the above solutions, preferably, the blocking member includes a chute 18, a limiting hole 19, and a positioning groove 20 arranged inside the top of the calcining furnace body 1. The chute 18, the limiting hole 19, and the positioning groove 20 are sequentially connected in series horizontally from left to right. The chute 18 passes through the channel 8. A blocking block 21 for blocking the channel 8 is movably arranged in the chute 18. A push rod 22 is fixedly connected to the right end of the blocking block 21. The right end of the push rod 22 passes through the limiting hole 19 and extends into the positioning groove 20. A grip rod 23 is movably arranged in the positioning groove 20. The lower end of the grip rod 23 is fixedly connected to the right end of the push rod 22. The upper end of the grip rod 23 passes through the positioning groove 20 and extends above the calcining furnace body 1.

[0038] The outer surface of the plugging block 21 is arranged to fit the inner surface of the sliding groove 18, and at the same time, it can move horizontally within the sliding groove 18. The outer surface of the push rod 22 is arranged to fit the inner surface of the limiting hole 19, and at the same time, it can move horizontally along the limiting hole 19. The outer surface of the grip rod 23 is arranged to fit the inner surface of the positioning groove 20, and at the same time, it can move horizontally along the positioning groove 20.

[0039] In this way, the operator can push and pull the upper end of the grip rod 23, and finally realize the horizontal movement of the plugging block 21 within the sliding groove 18, thereby realizing the plugging effect on the channel 8.

[0040] In any of the above solutions, preferably, an external thread is provided on the circumferential outer surface of the grip rod 23, and a matching hexagonal nut 24 is further included. The hexagonal nut 24 is threadedly connected to the grip rod 23, and the bottom of the hexagonal nut 24 presses against the top of the calcination furnace body 1.

[0041] To ensure the stability of the plugging block 21 when plugging the channel 8, the grip rod 23 is selected as a threaded rod, and a matching hexagonal nut 24 and corresponding gasket are provided. When the plugging block 21 plugs the channel 8, the gasket and the hexagonal nut 24 are fastened to the threaded section of the grip rod 23, and at the same time, the hexagonal nut 24 presses against the corresponding position (the side of the positioning groove 20) on the top of the calcination furnace body 1, so as to ensure the positioning of the grip rod 23, and finally realize the stability of the plugging block 21.

[0042] In any of the above solutions, preferably, the diameter of the channel 8 gradually increases from top to bottom along its axial direction.

[0043] The channel 8 is narrow at the top and wide at the bottom, which can prevent the mixture of aluminum powder and red phosphorus from falling along the inner wall of the channel 8, and further prevent the mixture from accumulating in the sliding groove 18.

[0044] In any of the above solutions, preferably, a clamping portion 25 is integrally formed along the circumference at the upper end of the firing pot 6.

[0045] The setting of the clamping portion 25 can facilitate the operator to clamp and fix the firing pot 6 through corresponding hook claws, avoiding scalding of personnel.

[0046] Specific working principle:

[0047] Open the furnace door 3, place the firing pot 6 in the circular positioning groove 5 of the placing plate 4, then close the furnace door 3. Then, place a certain proportion of aluminum powder and red phosphorus into the feeding hopper 12, and start the first motor 11 and the second motor 16. Driven by the first motor 11, the auger 10 rotates in the feeding pipe 9. At the same time, driven by the second motor 16, the mixing sieve 14 rotates synchronously. Driven by the rotation of the auger 10, the mixture of aluminum powder and red phosphorus is conveyed into the mixing sieve 14. Then, through the rotation of the mixing sieve 14, the two are evenly mixed. At the same time, the mixture of the two falls through the respective leakage holes 17 on the mixing sieve 14 to the bottom of the mixing box 7, and then falls into the firing pot 6 through the channel 8. After the feeding is completed, push the holding rod 23, so that the channel 8 is blocked by the blocking block 21, and the hexagonal nut 24 is threadedly fastened to the holding rod 23 to position the blocking block 21. After that, the mixture in the firing pot 6 can be calcined by the calcining furnace body 1.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

[0049] Those parts not detailed in the present invention are all well-known technologies to those skilled in the art of this technology.

Claims

1. A calcining furnace for aluminum phosphide tablets, comprising a calcining furnace body (1), a furnace chamber (2) being arranged inside the calcining furnace body (1), and a furnace door (3) being hingedly connected to a vertical side wall of the calcining furnace body (1), characterized in that: A placement plate (4) is fixedly connected horizontally to the lower part of the inner side wall of the furnace door (3), and a circular positioning groove (5) is provided on the top of the placement plate (4). The furnace also includes a sintering pot (6), the lower end of which is clamped in the circular positioning groove (5). A mixing box (7) is fixedly connected to the top of the calcining furnace body (1), and the circumferential inner wall of the lower end of the mixing box (7) is an inverted cone structure. A channel (8) for connecting the inner cavities of the mixing box (7) and the furnace (2) is provided in the middle of the top surface of the calcining furnace body (1), a feeding piece is provided on the left side of the mixing box (7), a mixing piece is provided on the right side of the mixing box (7), and a blocking piece for blocking the channel (8) is provided on the top of the calcining furnace body (1).

2. The aluminum phosphide tablet calcining furnace according to claim 1, characterized in that: The feeding member comprises a feeding pipe (9) arranged horizontally, the left end of the feeding pipe (9) being closed and the right end being open, the feeding pipe (9) being fixedly inserted into a mounting hole on the left wall of the mixing box (7) and extending into the inner cavity thereof, an auger (10) being coaxially arranged inside the feeding pipe (9) along its length direction, the left end of the rotating shaft of the auger (10) being movably inserted into a rotating hole on the left end surface of the feeding pipe (9) and extending to the outside thereof, and further comprising a first fixedly arranged motor (11), the motor shaft of the first motor (11) being coaxially fixedly connected to the left end of the rotating shaft of the auger (10), a feeding hopper (12) being fixedly connected to the top of the left end of the feeding pipe (9), a feeding port (13) being provided at a corresponding position of the top of the left end of the feeding pipe (9), the feeding port (13) being used to connect the inner cavities of the feeding hopper (12) and the feeding pipe (9).

3. The aluminum phosphide tablet calcining furnace according to claim 2, characterized in that: The mixing element comprises a cylindrical mixing screen (14), the mixing screen (14) being arranged in the inner cavity of the mixing box (7) along the horizontal direction, the right end of the mixing screen (14) being closed and the left end being open, a plurality of leakage holes (17) being evenly spaced on the circumferential surface of the mixing screen (14), the right end of the feeding pipe (9) being coaxially inserted into the inner cavity of the mixing screen (14), a center shaft (15) being coaxially fixedly connected to the right end surface of the mixing screen (14), the right end of the center shaft (15) being movably inserted into a rotating hole on the right wall of the mixing box (7) and extending to the outside thereof, and a second motor (16) being fixedly arranged, the motor shaft of the second motor (16) being coaxially fixedly connected to the right end of the center shaft (15).

4. The aluminum phosphide tablet calcining furnace according to claim 3, characterized in that: The blocking member comprises a slide groove (18), a limiting hole (19) and a positioning groove (20) arranged inside the top of the calcining furnace body (1); the slide groove (18), the limiting hole (19) and the positioning groove (20) are connected in series from left to right in the horizontal direction; the slide groove (18) passes through the channel (8); a blocking block (21) for blocking the channel (8) is movably arranged in the slide groove (18); a push rod (22) is fixedly connected to the right end of the blocking block (21); the right end of the push rod (22) passes through the limiting hole (19) and extends into the positioning groove (20); a gripping rod (23) is movably arranged in the positioning groove (20); the lower end of the gripping rod (23) is fixedly connected to the right end of the push rod (22); the upper end of the gripping rod (23) passes through the positioning groove (20) and extends to the top of the calcining furnace body (1).

5. The aluminum phosphide tablet calcining furnace according to claim 4, characterized in that: An external thread is provided on the circumferential outer surface of the gripping rod (23), and a matching hexagonal nut (24) is also provided. The hexagonal nut (24) is threadedly connected to the gripping rod (23), and the bottom of the hexagonal nut (24) is pressed against the top of the calcining furnace body (1).

6. The aluminum phosphide tablet calcining furnace according to claim 5, characterized in that: The diameter of the channel (8) increases gradually from top to bottom along its axial direction.

7. The aluminum phosphide tablet calcining furnace according to claim 6, characterized in that: A clamping portion (25) is formed at the upper end of the sintering tank (6) along its circumference.

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