Metal shell drying device and drying method

Abstract

A metal shell drying device and drying method relates to the technical field of drying and dehydration equipment, comprising a mounting base, a drying drum with an upper end opening fixed on the mounting base, a bidirectional countercurrent drying assembly provided in the drying drum; the bidirectional countercurrent drying assembly comprising an upper air inlet ring drum and a lower air inlet ring drum welded to and connected to the outer peripheral wall of the drying drum; three rotationally symmetrical forward air inlet pipes are welded to the outer peripheral wall of the lower air inlet ring drum, and three rotationally symmetrical reverse air inlet pipes are welded to the outer peripheral wall of the upper air inlet ring drum; a compressed air pump is fixed at the port of each forward air inlet pipe, an electric heating pipe is fixed in each forward air inlet pipe, and a compressed air pump and an electric heating pipe are also provided in each reverse air inlet pipe. The present invention solves the problems existing in the traditional technology during the drying of metal shells, such as insufficient airflow coverage due to complex structures, poor static drying uniformity, deformation caused by simultaneous drying of inner and outer walls, difficulty in drying deep cavities, and low manual operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of drying and dewatering equipment, and in particular to a metal shell drying device and a drying method. Background Art

[0002] In the field of precision metal manufacturing (such as aerospace components, electronic equipment housings, and medical device casings), efficient drying of workpieces after cleaning is a critical process for ensuring product rust resistance, coating adhesion, and dimensional stability. As industrial products become increasingly lightweight and complex, metal casings often incorporate multi-curved surfaces, deep blind holes, and thin, irregularly shaped features, posing significant challenges to traditional drying technologies.

[0003] However, existing drying technologies have significant limitations, including:

[0004] 1. The drying effect on complex geometric structures is poor. Specifically, traditional hot air drying uses a one-way airflow, which is difficult to penetrate grooves, blind holes, and deep cavity structures. This causes moisture to remain in dead corners of the airflow, affecting product yield.

[0005] 2. Drying uniformity is difficult to ensure. Specifically, during static drying, the workpiece is stationary and the airflow direction is single, resulting in excessive drying of the windward side and residual water stains on the leeward side. This is especially prone to quality defects for metal shells that require high surface precision.

[0006] 3. Risk of deformation caused by simultaneous drying of the inner and outer walls. Specifically, if the inner and outer walls of the workpiece are heated simultaneously, due to differences in the thermal conductivity of the metals and the structural shielding effect, the temperature gradient between the inner and outer walls will be significant, which may induce thermal stress deformation. In addition, the inner wall of the deep cavity cannot be penetrated by the airflow in a targeted manner, resulting in extremely poor drying effect.

[0007] 4. Low automation and insufficient safety. Specifically, existing equipment relies heavily on manual clamping and positioning, resulting in low operating efficiency. High temperatures can easily lead to burns, which is inconsistent with the trend of industrial automation.

[0008] 5. Low energy utilization. Specifically, traditional equipment uses an overall heating mode and cannot control the temperature according to the heat capacity requirements of different areas of the workpiece, resulting in energy waste and increased production costs.

[0009] 6. System sealing and environmental defects. Specifically, the drying chamber is not tightly sealed, resulting in heat leakage and poor temperature field stability. At the same time, the exhaust gas is directly discharged without centralized treatment, posing a risk to environmental compliance.

[0010] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0011] In response to the defects in the existing technology, the present invention provides a metal shell drying device and drying method to solve the problems existing in the traditional technology during the metal shell drying process, such as insufficient airflow coverage of the complex structure, poor static drying uniformity, deformation caused by simultaneous drying of the inner and outer walls, difficulty in drying deep cavities, and low manual operation efficiency.

[0012] To achieve the above object, the present invention provides the following technical solutions:

[0013] A metal shell drying device comprises a mounting base, a drying cylinder with an upper end open is fixedly provided on the mounting base, and a bidirectional countercurrent drying component is arranged in the drying cylinder.

[0014] As an optimized solution, the bidirectional countercurrent drying assembly includes an upper air inlet ring cylinder and a lower air inlet ring cylinder that are symmetrically arranged. The upper air inlet ring cylinder and the lower air inlet ring cylinder are respectively welded to the outer peripheral wall of the drying cylinder and are connected thereto.

[0015] As an optimized solution, three rotationally symmetrical forward air inlet pipes are welded on the outer peripheral wall of the lower air inlet ring tube, and the forward air inlet pipes are connected to the lower air inlet ring tube. Three rotationally symmetrical reverse air inlet pipes are welded on the outer peripheral wall of the upper air inlet ring tube, and the reverse air inlet pipes are connected to the upper air inlet ring tube.

[0016] As an optimized solution, a compressed air pump is fixed at the port of each forward air inlet pipe, an electric heating pipe is fixed in each forward air inlet pipe, power supply modules connected to the electric heating pipe are fixed on the upper and lower end faces of the forward air inlet pipe, and the compressed air pump, the electric heating pipe and the power supply module are also respectively provided in each reverse air inlet pipe.

[0017] As an optimized solution, a plurality of rotationally symmetrical forward air inlets are respectively opened on the inner circumferential wall of the drying cylinder corresponding to the lower air inlet ring cylinder, and a plurality of rotationally symmetrical reverse air inlets are respectively opened on the inner circumferential wall of the drying cylinder corresponding to the upper air inlet ring cylinder.

[0018] As an optimized solution, a horizontal cover is provided on the top of the drying cylinder, an exhaust port is provided on the horizontal cover, and an annular groove matching the upper opening of the drying cylinder is provided on the lower surface of the horizontal cover.

[0019] As an optimized solution, a conical air collecting hopper is provided on the outside of the exhaust port, the lower end of the air collecting hopper is mounted on the upper surface of the horizontal cover plate by bolts, the upper end of the air collecting hopper is fixed with an electric control valve, and an exhaust pump is fixedly mounted on the electric control valve.

[0020] As an optimized solution, the mounting base is a horizontally grounded square base, four centrally symmetrical strip support plates are welded to the middle of the upper surface of the mounting base, and the lower end of the drying cylinder is welded to the four strip support plates.

[0021] As an optimized solution, a vertical central rotating shaft is provided in the middle of the four strip support plates, the lower end of the central rotating shaft is rotatably mounted on the upper surface of the mounting base, and the upper end of the central rotating shaft passes through the lower end surface of the drying cylinder and extends into the interior thereof.

[0022] As an optimized solution, a driven rotating wheel is further provided between the four strip-shaped supporting plates, and the driven rotating wheel is welded to the peripheral wall of the central rotating shaft.

[0023] As an optimized solution, a motor mounting seat is welded to one side of the upper surface of the mounting base, and the motor mounting seat is a U-shaped seat with the opening facing downward. A rotating drive motor is fixed to the middle of the upper surface of the motor mounting seat, and the end of the output shaft of the rotating drive motor passes downward through the motor mounting seat and is fixedly connected to a driving pulley, and a transmission belt is provided between the driving pulley and the driven pulley.

[0024] As an optimized solution, a lifting drive element is fixed to the upper end of the central rotating shaft, and a horizontal circular support plate is fixed to the upper end of the lifting drive element. Four centrally symmetrical clamping grooves are provided on the upper surface of the circular support plate, and a square clamping slider is respectively mounted in each of the clamping grooves. The lower surface of the circular support plate is provided with a sliding drive module corresponding to each of the clamping sliders.

[0025] As an optimized solution, a lifting and clamping assembly is also provided on the mounting base, and an electrical control box is fixedly provided on one side of the upper surface of the mounting base. The lifting and clamping assembly includes two symmetrically arranged U-shaped limit frames, and the U-shaped limit frames are extended vertically. The lower end of each U-shaped limit frame is welded to the upper surface of the electrical control box.

[0026] As an optimized solution, a square lifting seat is slidably mounted between the two U-shaped limit frames, and two symmetrical lifting control modules are fixed on the upper surface of the electrical control box. Each lifting control module is connected to an external vertical screw, and the two vertical screws pass through and are threadedly connected to the square lifting seat.

[0027] As an optimized solution, a flip drive motor is fixed to the back of the square lifting seat, and a limiting cylinder is welded to the front of the square lifting seat.

[0028] As an optimized solution, a connecting column seat is welded on the lateral side end face of the horizontal cover plate, and the connecting column seat is rotatably clamped in the limiting cylinder. The output shaft end of the flip drive motor passes through the square lifting seat and is fixed to the center of the side end face of the connecting column seat.

[0029] As an optimized solution, the lifting and clamping assembly also includes three groups of centrally symmetrical sliding guide rails, which are welded to the lower surface of the horizontal cover plate. A sliding top seat is respectively mounted in each group of the sliding guide rails, and a sliding control module for driving the sliding top seat to move is also fixed in the sliding guide rails.

[0030] As an optimized solution, a vertical clamping arm is welded to the lower surface of each sliding top seat.

[0031] As an optimized solution, when the above metal shell drying device is used, the specific drying method is as follows:

[0032] The metal shell to be dried is clamped by the lifting and clamping assembly and transferred to the drying drum, and the upper end of the drying drum is closed with a horizontal cover plate;

[0033] The metal shell is supported by a circular support plate and clamped by a clamping slider;

[0034] Start each compressed air pump to send double layers of hot air with opposite rotation directions into the drying drum to dry the outer surface of the metal shell;

[0035] Start the exhaust pump to draw the external hot air into the metal shell through the clamping chute and form a directional upward flow to dry the inner wall of the metal shell;

[0036] After drying is completed, the metal shell is clamped again using the lifting and clamping assembly, and is removed from the drying drum through lifting and flipping operations for disassembly and replacement.

[0037] Compared with the prior art, the present invention has the following significant technical effects:

[0038] 1. This invention achieves efficient, zero-dead-angle drying of metal casings. Specifically, it utilizes a bidirectional countercurrent airflow design. The clockwise hot airflow from the lower layer (positive air inlet) counteracts the counterclockwise hot airflow from the upper layer (reverse air inlet), generating three-dimensional turbulence within the drying drum. This eliminates dead-angle airflow caused by the metal casing's complex geometric structure (such as grooves and blind holes). Furthermore, the bidirectional airflow covers the entire surface of the workpiece, avoiding the uneven drying caused by unidirectional airflow.

[0039] 2. This invention utilizes dynamic drying to enhance drying uniformity. Specifically, a workpiece rotation mechanism is incorporated. A rotating drive motor drives a central shaft via a transmission belt, driving the circular support plate holding the workpiece to continuously rotate. This dynamically repositions the workpiece relative to the fixed air inlet, ensuring uniform hot airflow across all exterior surfaces. This avoids the problem of "overdrying the windward side and residual moisture on the leeward side" that occurs with static drying.

[0040] 3. This invention utilizes a phased drying method for the inner and outer walls, and utilizes a specific mechanism to achieve intelligent switching between internal and external drying. Specifically, when drying the outer wall, a bidirectional hot air flow covers the exterior of the shell. When drying the inner wall, an exhaust pump actively draws the hot air into the metal shell through a clamping chute, directional-flushing the inner wall. This phased drying method prevents metal deformation caused by temperature differences between the inside and outside, and the directional flow of air on the inner wall solves the drying problem within deep cavity structures.

[0041] 4. The present invention enables automated clamping and positioning of metal casings. Specifically, the present invention incorporates a multi-degree-of-freedom clamping system. Through the coordinated operation of flipping and lifting, the horizontal cover plate can be flipped to clamp the workpiece, and then raised and lowered to seal and engage the drying drum. The present invention employs a two-stage clamping mechanism, where the workpiece is first secured by a vertical clamping arm, and then transferred to a clamping slide on a circular support plate. This clamping and positioning method automates the entire process of workpiece clamping, drying, and removal, while also preventing manual operation from contacting high-temperature components, thereby improving safety.

[0042] 5. This invention optimizes energy utilization. Specifically, it utilizes independent zone temperature control, with independent electric heating pipes and compressed air pumps built into both the forward and reverse air inlet ducts. This supports on-demand zone heating, thereby reducing ineffective heat loss and lowering energy consumption. The airflow temperature in different zones can also be adjusted based on the thickness of the metal casing.

[0043] 6. The present invention forms a closed space by tightly engaging the annular groove of the horizontal cover with the upper end of the drying cylinder to prevent leakage of hot air flow and maintain a stable temperature in the cylinder; the exhaust gas is then centrally treated by the gas collecting hopper in conjunction with the electric control valve and exhaust pump to meet environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0045] Figure 1 Schematic diagram of the external structure of the present invention in the main viewing direction;

[0046] Figure 2 Schematic diagram of the external structure of the present invention when viewed from above;

[0047] Figure 3 Schematic diagram of the external structure of the present invention in a side view;

[0048] Figure 4 For the present invention Figure 1 Schematic diagram of the internal structure cut along the AA line;

[0049] Figure 5 For the present invention Figure 2 Schematic diagram of the internal structure cut through the midline BB;

[0050] Figure 6 For the present invention Figure 1 Schematic diagram of the internal structure cut through the CC line;

[0051] Figure 7 It is a three-dimensional schematic diagram of the external structure of the present invention.

[0052] In the figure: 1-mounting base, 2-drying drum, 3-strip support plate, 4-center shaft, 5-driven rotor, 6-motor mounting base, 7-rotating drive motor, 8-driving rotor, 9-transmission belt, 10-lifting drive element, 11-circular support plate, 12-clamping slide, 13-clamping slider, 14-sliding drive module, 15-upper air inlet ring, 16-lower air inlet ring, 17-forward air inlet pipe, 18-reverse air inlet pipe, 19-compressed air pump, 20-electric heating pipe, 21-power supply Module, 22-forward air inlet, 23-reverse air inlet, 24-electric control box, 25-U-shaped limit frame, 26-square lifting seat, 27-lifting control module, 28-vertical screw, 29-flip drive motor, 30-limit cylinder, 31-horizontal cover, 32-connecting column base, 33-exhaust port, 34-annular slot, 35-gas collecting hopper, 36-electrically controlled valve, 37-exhaust pump, 38-sliding guide rail, 39-sliding top seat, 40-sliding control module, 41-vertical clamping arm. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0054] like Figures 1 to 7 As shown, a metal shell drying device and drying method include a mounting base 1, which is a horizontally grounded square base. A drying cylinder 2 is fixed on the mounting base 1, and the upper end of the drying cylinder 2 is open. A two-way countercurrent drying component is provided in the drying cylinder 2, and a lifting clamping component is provided on one side of the upper surface of the mounting base 1.

[0055] Four centrosymmetrical strip support plates 3 are welded to the middle of the upper surface of the mounting base 1 , and the lower end of the drying drum 2 is welded to the four strip support plates 3 .

[0056] A vertical central shaft 4 is provided in the middle of the four strip-shaped support plates 3. The lower end of the central shaft 4 is rotatably mounted on the upper surface of the mounting base 1. The upper end of the central shaft 4 passes through the lower end surface of the drying cylinder 2 and extends into the interior thereof.

[0057] A driven rotating wheel 5 is provided between the four strip-shaped supporting plates 3 , and the driven rotating wheel 5 is welded to the peripheral wall of the central rotating shaft 4 .

[0058] A motor mounting seat 6 is welded to one side of the upper surface of the mounting base 1. The motor mounting seat 6 is a U-shaped seat with the opening facing downward. A rotation drive motor 7 is fixed to the middle of the upper surface of the motor mounting seat 6. The end of the output shaft of the rotation drive motor 7 passes downward through the motor mounting seat 6 and is fixedly connected to a driving pulley 8. A transmission belt 9 is sleeved between the driving pulley 8 and the driven pulley 5.

[0059] A lifting drive element 10 is fixed to the upper end of the central rotating shaft 4, and a horizontal circular support plate 11 is fixed to the upper end of the lifting drive element 10. Four centrally symmetrical clamping grooves 12 are provided on the upper surface of the circular support plate 11, and a square clamping slider 13 is respectively clamped in each clamping groove 12. A sliding drive module 14 is respectively provided on the lower surface of the circular support plate 11 corresponding to each clamping slider 13.

[0060] The bidirectional countercurrent drying assembly includes an upper air inlet ring cylinder 15 and a lower air inlet ring cylinder 16 that are symmetrically arranged. The upper air inlet ring cylinder 15 and the lower air inlet ring cylinder 16 are respectively welded to the outer peripheral wall of the drying cylinder 2.

[0061] Three rotationally symmetrical forward air inlet pipes 17 are welded on the outer peripheral wall of the lower air inlet ring tube 16, and the forward air inlet pipes 17 are connected to the lower air inlet ring tube 16. Three rotationally symmetrical reverse air inlet pipes 18 are welded on the outer peripheral wall of the upper air inlet ring tube 15, and the reverse air inlet pipes 18 are connected to the upper air inlet ring tube 15.

[0062] A compressed air pump 19 is fixed at the end of each forward air inlet pipe 17 , an electric heating pipe 20 is fixed in each forward air inlet pipe 17 , and power supply modules 21 connected to the electric heating pipe 20 are fixed on the upper and lower end surfaces of the forward air inlet pipe 17 .

[0063] A compressed air pump 19 is fixed at the end of each reverse air inlet pipe 18, an electric heating pipe 20 is fixed in each reverse air inlet pipe 18, and power supply modules 21 connected to the electric heating pipe 20 are fixed on the upper and lower end surfaces of the reverse air inlet pipe 18.

[0064] A plurality of rotationally symmetrical forward air inlets 22 are respectively provided on the inner peripheral wall of the drying drum 2 corresponding to the lower air inlet ring cylinder 16 , and a plurality of rotationally symmetrical reverse air inlets 23 are respectively provided on the inner peripheral wall of the drying drum 2 corresponding to the upper air inlet ring cylinder 15 .

[0065] An electric control box 24 is fixedly provided on one side of the upper surface of the mounting base 1. The lifting and clamping assembly includes two symmetrically arranged U-shaped limit frames 25. The U-shaped limit frames 25 extend vertically, and the lower end of each U-shaped limit frame 25 is welded to the upper surface of the electric control box 24.

[0066] A square lifting seat 26 is slidably mounted between the two U-shaped limit frames 25 , and two symmetrical lifting control modules 27 are fixed on the upper surface of the electric control box 24 . Each lifting control module 27 is respectively connected to an external vertical screw 28 , and the two vertical screws 28 respectively pass through and are threadedly connected to the square lifting seat 26 .

[0067] A flip drive motor 29 is fixed to the back of the square lifting seat 26 , and a limiting cylinder 30 is welded to the front of the square lifting seat 26 .

[0068] The lifting and clamping assembly also includes a horizontal cover plate 31, on the lateral side end face of which a connecting column seat 32 is welded. The connecting column seat 32 is rotatably clamped in the limiting cylinder 30, and the output shaft end of the flipping drive motor 29 passes through the square lifting seat 26 and is fixed to the center of the side end face of the connecting column seat 32.

[0069] An exhaust port 33 is provided in the middle of the upper surface of the horizontal cover plate 31 corresponding to the drying drum 2 , and an annular groove 34 matching the upper opening of the drying drum 2 is provided on the lower surface of the horizontal cover plate 31 .

[0070] A conical air collecting hopper 35 is provided on the outside of the exhaust port 33. The lower end of the air collecting hopper 35 is mounted on the upper surface of the horizontal cover plate 31 by bolts. An electric control valve 36 is fixed on the upper end of the air collecting hopper 35. An exhaust pump 37 is fixed on the electric control valve 36.

[0071] Three sets of centrally symmetrical sliding guide rails 38 are welded to the lower surface of the horizontal cover plate 31 . A sliding top seat 39 is respectively mounted in each set of sliding guide rails 38 . A sliding control module 40 for driving the sliding top seat 39 to move is also fixed in the sliding guide rails 38 .

[0072] A vertical clamping arm 41 is welded to the lower surface of each sliding top seat 39 .

[0073] To use the present invention: First, activate the flip drive motor 29 to flip the horizontal cover plate 31 from a horizontal to a vertical position. Next, place the metal shell to be dried between the three sets of vertical clamping arms 41. Activate the sliding control module 40 to drive the vertical clamping arms 41 to slide along the sliding guide rails 38, clamping and positioning the metal shell. Next, activate the flip drive motor 29 again to rotate the horizontal cover plate 31 to a horizontal position, positioning the metal shell directly opposite the drying drum 2. Activate the lift control module 27, rotating the vertical screw 28 and driving the square lift seat 26 downward along the two U-shaped limit brackets 25 until the annular groove 34 on the lower surface of the horizontal cover plate 31 engages with the upper end of the drying drum 2. Then, control the lift drive element 10 to extend, causing the upper surface of the circular support plate 11 to rest against the lower end of the metal shell. At this point, the vertical clamping arm 41 is controlled to slide to release the metal shell. Simultaneously, the sliding drive module 14 is activated, driving the clamping slider 13 along the clamping slot 12, clamping the metal shell in place from the bottom. The electrically controlled valve 36 is closed, and the compressed air pumps 19 are activated to force air into the drying drum 2. Compressed air entering through the forward air inlet duct 17 is heated by the electric heating tube 20, forming a clockwise drying hot air flow within the lower air inlet ring 16 and exiting through the forward air inlet 22, forming a lower layer of rotating airflow. Compressed air entering through the reverse air inlet duct 18 is heated by the electric heating tube 20 and forming a counterclockwise drying hot air flow within the upper air inlet ring 15, exiting through the reverse air inlet 23, forming an upper layer of rotating airflow. The combined effect of the upper and lower layers of hot air rotating in opposite directions within the drying drum 2 ensures seamless drying of the metal shell, effectively avoiding the problem of insufficient drying coverage caused by the unique shell shape or a single airflow direction. During the external drying process, the rotary drive motor 7 is activated, driving the active rotor 8. This, in turn, is driven by the transmission belt 9, the driven rotor 5, and the central shaft 4, driving the circular support plate 11 to rotate about its axis, thereby changing the metal shell's position relative to the forward air inlet 22 and the reverse air inlet 23 in real time. After the external drying process is complete, the lifting drive element 10 is again extended, causing the upper end of the metal shell to rest against the lower surface of the horizontal cover plate 31. The electrically controlled valve 36 is opened, and the exhaust pump 37 is activated, drawing the external hot air flow into the metal shell through the clamping chute 12, forming a directional upward flow and drying the inner wall of the metal shell. After the internal drying process is complete, the lifting and clamping assembly is again used to clamp the metal shell. It is then removed from the drying drum 2 through a lifting and flipping operation for disassembly and replacement.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and description of the present invention.

Claims

1. A metal shell drying device, characterized by: It includes a mounting base, on which a drying drum with an upper end opening is fixed, and a two-way countercurrent drying component is arranged in the drying drum; The bidirectional countercurrent drying assembly comprises an upper air inlet ring cylinder and a lower air inlet ring cylinder which are symmetrically arranged. The upper air inlet ring cylinder and the lower air inlet ring cylinder are respectively welded to the outer peripheral wall of the drying cylinder and are in communication with the drying cylinder. Three rotationally symmetrical forward air inlet pipes are welded on the outer peripheral wall of the lower air inlet ring, and the forward air inlet pipes are connected to the lower air inlet ring. Three rotationally symmetrical reverse air inlet pipes are welded on the outer peripheral wall of the upper air inlet ring, and the reverse air inlet pipes are connected to the upper air inlet ring. A compressed air pump is fixed at the port of each forward air inlet pipe, an electric heating pipe is fixed in each forward air inlet pipe, and power supply modules connected to the electric heating pipe are fixed on the upper and lower end surfaces of the forward air inlet pipe, and a compressed air pump, an electric heating pipe and a power supply module are also fixed in each reverse air inlet pipe. The inner circumference of the drying drum is provided with a plurality of rotationally symmetrical forward air inlets corresponding to the lower air inlet ring cylinder, and the inner circumference of the drying drum is provided with a plurality of rotationally symmetrical reverse air inlets corresponding to the upper air inlet ring cylinder; A horizontal cover is provided on the top of the drying drum, an exhaust port is provided on the horizontal cover, and an annular groove matching the opening at the upper end of the drying drum is provided on the lower surface of the horizontal cover; A conical gas collecting hopper is provided on the outside of the exhaust port. The lower end of the gas collecting hopper is fixed to the upper surface of the horizontal cover plate by bolts. An electric control valve is fixed on the upper end of the gas collecting hopper, and an exhaust pump is fixed on the electric control valve. The installation base is a horizontally grounded square base. Four centrosymmetrical strip support plates are welded to the middle of the upper surface of the installation base, and the lower end of the drying cylinder is welded to the four strip support plates. A vertical central rotating shaft is provided in the middle of the four strip-shaped support plates. The lower end of the central rotating shaft is rotatably mounted on the upper surface of the mounting base. The upper end of the central rotating shaft passes through the lower end surface of the drying drum and extends into the interior thereof. A driven rotating wheel is also provided in the middle of the four strip-shaped support plates. The driven rotating wheel is welded to the peripheral wall of the central rotating shaft. A motor mounting seat is welded to one side of the upper surface of the mounting base. The motor mounting seat is a U-shaped seat with an opening facing downward. A rotation drive motor is fixed to the middle of the upper surface of the motor mounting seat. The output shaft end of the rotation drive motor passes downward through the motor mounting seat and is fixedly connected to the driving wheel. A transmission belt is provided between the driving wheel and the driven wheel. A lifting drive element is fixed to the upper end of the central rotating shaft, and a horizontal circular support plate is fixed to the upper end of the lifting drive element. Four centrally symmetrical clamping grooves are opened on the upper surface of the circular support plate, and a square clamping slider is respectively clamped in each clamping groove. The lower surface of the circular support plate is provided with a sliding drive module corresponding to each clamping slider.

2. The metal shell drying device according to claim 1, characterized in that: The mounting base is further provided with a lifting clamping assembly, an electric control box is fixedly provided on one side of the upper surface of the mounting base, and the lifting clamping assembly includes two symmetrically arranged U-shaped limit frames, the U-shaped limit frames are vertically extended, and the lower end of each of the U-shaped limit frames is respectively welded to the upper surface of the electric control box; A square lifting seat is slidably mounted between the two U-shaped limit frames. Two symmetrical lifting control modules are fixed on the upper surface of the electric control box. Each lifting control module is respectively connected to an external vertical screw, and the two vertical screws respectively pass through and are threadedly connected to the square lifting seat.

3. The metal shell drying device according to claim 2, characterized in that: A flip drive motor is fixed on the back of the square lifting seat, and a limiting cylinder is welded on the front of the square lifting seat; A connecting column seat is welded on the lateral side end surface of the horizontal cover plate, and the connecting column seat is rotatably clamped in the limiting cylinder. The output shaft end of the flip drive motor passes through the square lifting seat and is fixed to the center of the side end surface of the connecting column seat.

4. The metal shell drying device according to claim 3, characterized in that: The lifting and clamping assembly further comprises three sets of centrally symmetrical sliding guide rails, the three sets of sliding guide rails being welded to the lower surface of the horizontal cover plate, each set of the sliding guide rails being respectively clamped with a sliding top seat, and a sliding control module for driving the sliding top seat to move being also fixed in the sliding guide rails; A vertical clamping arm is welded to the lower surface of each sliding top seat.

5. A method for drying a metal shell, characterized in that: Using the metal shell drying device according to any one of claims 1 to 4, the drying step includes: The metal shell to be dried is clamped by the lifting and clamping assembly and transferred to the drying drum, and the upper end of the drying drum is closed with a horizontal cover plate; The metal shell is supported by a circular support plate and clamped by a clamping slider; Start each compressed air pump to send double layers of hot air with opposite rotation directions into the drying drum to dry the outer surface of the metal shell; Start the exhaust pump to draw the external hot air into the metal shell through the clamping chute and form a directional upward flow to dry the inner wall of the metal shell; After drying is completed, the metal shell is clamped again using the lifting and clamping assembly, and is removed from the drying drum through lifting and flipping operations for disassembly and replacement.

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