Core rod lubricating coating coating device and process

Abstract

The invention discloses a core rod lubricating coating coating device and process, and belongs to the technical field of coating equipment, the core rod lubricating coating coating device comprises a machine base, a feeding mechanism is arranged on one side of the machine base, a feeding mechanism is arranged on the other side of the machine base, and a cross beam frame is horizontally fixed above the machine base; a core rod conveying mechanism is arranged in the middle of the upper end face of the machine base, and a plurality of coating devices are arranged in the length direction of the machine base. A drying seat is arranged between every two adjacent coating devices on the machine base; the multiple sets of coating devices are distributed, the surface of the core rod lubricating coating can be completely coated and covered through the multiple coating devices in sequence in the coating process, the core rod can axially slide in a reciprocating mode while rotating, and then the coating uniformity of the core rod is guaranteed; and a plurality of liquid guide shafts are further distributed on the coating plate and can perform rolling press coating on the surface of the core rod through balls under ultrasonic vibration, so that press coating thickened textures are formed on the surface of the core rod, the wear resistance of a coating is improved, and the service life of the coating is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of coating equipment, and in particular relates to a core rod lubricating coating coating device and process. Background Art

[0002] The application process of lubricating coatings on mandrels is a key technology for improving the lubrication performance, anti-friction ability, and service life of mandrel surfaces. Traditional mandrel coating systems typically utilize a single-unit coating device, applying the lubricating coating through simple brushing, spraying, or dipping methods. However, single-unit coating systems struggle to ensure uniform distribution of the lubricating coating across the mandrel surface. Furthermore, due to the lack of effective coating control, the lubricating liquid struggles to fully penetrate the mandrel surface during the coating process, resulting in insufficient coating adhesion and easy flaking or peeling, which impacts the long-term performance of the mandrel.

[0003] Therefore, it is necessary to provide a mandrel lubricating coating coating device and process to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a core rod lubricating coating coating device, comprising a machine base, one side of which is provided with a loading mechanism, the other side of the machine base is provided with a feeding mechanism, and a crossbeam frame is horizontally fixed above it; a core rod transmission mechanism is provided in the middle part of the upper end surface of the machine base, and a plurality of coating devices are arranged along the length direction of the machine base; a drying seat is provided on the machine base between two adjacent coating devices.

[0005] Preferably, the core rod transmission mechanism is divided into two groups distributed in parallel, and a base plate is provided on the machine base on one side of each core rod transmission mechanism, an adjustment support is slidably installed on the base plate, and a rotating shaft is connected to the adjustment support for horizontal rotation; a column is coaxially fixed to one end of the rotating shaft, and a plurality of positioning grooves are equidistantly distributed on the outer circumference of the column, and a core rod clamp is installed at both ends of each positioning groove.

[0006] Preferably, the coating device is located between two cylinders, and the two cylinders rotate synchronously and in the same direction.

[0007] Preferably, a hot air box is installed on the lower end surface of the drying seat.

[0008] Preferably, the coating device includes an upper fixed frame, which is fixed below the crossbeam frame. A mounting groove is provided inside the upper fixed frame. A central shaft is rotatably connected in the mounting groove. A coupling cylinder is fixed on the central shaft. A plurality of inner notches are distributed circumferentially on the coupling cylinder. A coating plate is installed on the inner wall of each inner notch, and a coating layer is embedded in the coating plate.

[0009] Preferably, each of the coating plates is rotatably connected to the coupling cylinder, and a fixed shaft plate is embedded in the coupling cylinder on one side of each inner notch near the center of the circle, and two guide shafts are arranged in parallel on the fixed shaft plate and are slidably connected in the coupling cylinder through the guide shafts; two support rods are symmetrically hinged on both sides of the fixed shaft plate, and the other end of each support rod is connected to the corresponding coating plate; a plurality of telescopic guide rods corresponding to the inner notches are radially distributed in the coupling cylinder, and the output ends of the telescopic guide rods are connected to the fixed shaft plate; a plurality of arranged and distributed ball grooves are provided on both sides of the coating layer on one end face of the coating plate, and balls are rotatably connected in the ball grooves.

[0010] Preferably, two mounting plates are symmetrically fixed on the bottom wall of the inner slot, one of the mounting plates is provided with a rotating wheel which is rotatably arranged and which is in contact with the outer peripheral wall of the core rod; and side plates are horizontally slidably connected to the mounting plates, the side plates are arranged parallel to the axial end faces of the coupling cylinder, and a pulse cylinder is transversely fixed to the mounting plates, and the telescopic end of the pulse cylinder is connected to the side plates.

[0011] Preferably, the two pulse cylinders work in conjunction with each other and control the core rod to move back and forth along the length direction of the coating plate through the side plate at a multi-level telescopic frequency; arranged and distributed liquid channels are opened in the coating layer, and a coating liquid pipe is connected to the outside of the liquid channel.

[0012] Preferably, a plurality of convex edges are evenly distributed on the coating plate, and holes are provided in the coating layer, the convex edges and the holes are fitted together, a shaft sleeve is embedded and fixed in each convex edge, a liquid guide shaft is slidably connected in the shaft sleeve, an inner spring is provided between the liquid guide shaft and the shaft sleeve; a ball is rollingly connected to one end of the liquid guide shaft, a flow cavity is provided in the liquid guide shaft, and a plurality of micropores are distributed on the surface of the flow cavity; an ultrasonic vibrator is integrated in the convex edge, and the output end of the ultrasonic vibrator is connected to the liquid guide shaft.

[0013] Preferably, a process for applying a lubricating coating to a mandrel comprises the following steps: S1. The loading mechanism transports the mandrel to the starting end of the machine base, at which point the mandrel is transported horizontally along its axis. S2. The mandrel is transported horizontally by the mandrel transport mechanism. When it reaches the bottom of the column, the column clamps the mandrel at both ends using mandrel grippers. S3. The mandrel rises as the cylinder rotates, and the coating plate in the coating device clamps the mandrel body in cooperation with the rotating coupling. At this time, the coating layer contacts the outer surface of the mandrel, and the rotating wheel is in full contact with the outer wall of the mandrel; S4. The rotating wheel drives the mandrel to rotate autonomously according to the coating process, allowing the coating layer to completely coat the entire mandrel. Two pulse cylinders on the mounting plate, in a telescopic arrangement, drive the mandrel to slide axially back and forth between the coating layers at a specified frequency. During this operation, the liquid-guiding axes in the convex edges vibrate at high frequencies under the operation of the ultrasonic vibrators, while the balls at their ends contact the mandrel surface, allowing the lubricant to be applied to the mandrel surface through the balls via the flow chamber. S5. After the coating is completed, the mandrel is clamped by the mandrel clamp on both ends of the mandrel by the other side of the cylinder, and the mandrel is transported to the corresponding side of the mandrel transmission mechanism as the cylinder rotates; S6. The initially coated mandrel is quickly dried by a hot air blown from a drying station through a hot air box; S7 repeats S2-S6, and achieves multi-layer coating by multiple coating devices until the target coating thickness is reached; S8. The feeding mechanism transfers the finished core rods to the collection area for easy quality inspection and sorting.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the coating devices are distributed in multiple groups, and the core rod lubricating coating can pass through multiple coating devices in sequence to achieve complete surface coating and coverage, wherein a drying seat is arranged between adjacent coating devices, and each drying seat can dry the surface of the core rod after completing a single coating operation, so that each layer of coating can better adhere to the surface of the core rod. Through layer-by-layer coverage, the adhesion and durability of the coating are significantly improved; wherein, each coating device is also provided with a rotating wheel and a pulse cylinder, which can cooperate with each other to control the rotation of the core rod while pushing the core rod axially to slide back and forth, further ensuring the uniformity of the core rod coating; and a plurality of liquid guide shafts are evenly distributed on the coating plate, which can roll and press the core rod surface through balls under ultrasonic vibration, promote the close combination of the lubricating liquid and the core rod surface, enhance the adhesion of the coating, and form a press-coated thickened texture on the core rod surface. These textures help to increase the surface area of ​​the coating, improve the lubrication performance and anti-friction ability, and enhance the wear resistance and service life of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the coating device and the two cylinders working in cooperation with each other in the present invention; Figure 3 Schematic diagram of the structure of the column in the present invention; Figure 4 Schematic diagram of the structure of the coating device in the present invention; Figure 5 Schematic diagram of the structure of the fixed shaft plate in the present invention; Figure 6 Schematic diagram of the structure of the coating plate in the present invention; Figure 7 is a schematic diagram of the cross-sectional structure of the mounting plate in the present invention; Figure 8 Schematic diagram of the cross-sectional structure of the coating plate in the present invention; Figure 9 Schematic diagram of the structure of the liquid-guiding shaft in the present invention; In the figure: 1. Machine base; 11. Loading mechanism; 12. Feeding mechanism; 13. Mandrel transmission mechanism; 14. Crossbeam frame; 15. Drying seat; 16. Hot air box; 2. Coating device; 21. Upper fixed frame; 22. Center axis; 23. Coupling cylinder; 24. Inner notch; 25. Fixed shaft plate; 26. Guide shaft; 27. Support rod; 28. Telescopic guide rod; 3. Bottom plate; 31. Adjusting support; 32. Rotating shaft; 33. Cylinder; 34. Positioning groove; 35. Mandrel clamp; 4. Coating plate; 41. Coating layer; 42. Ball; 43. Liquid channel; 44. Hole groove; 45. Bushing; 46. Liquid guide shaft; 47. Inner spring; 48. Ball; 49. Flow chamber; 410. Ultrasonic vibrator; 5. Mounting plate; 51. Rotating wheel; 52. Side plate; 53. Pulse cylinder. DETAILED DESCRIPTION

[0016] See also Figures 1-9 In an embodiment of the present invention, a device for applying a lubricating coating to a mandrel includes a base 1, one side of which is provided with a loading mechanism 11. The loading mechanism 11 is capable of horizontally transferring mandrels to the base 1 in sequence. A feeding mechanism 12 is provided on the other side of the base 1 for transferring the coated mandrels one by one, and a crossbeam 14 is horizontally fixed above the feeding mechanism 12. A core rod transmission mechanism 13 is provided in the middle of the upper end surface of the machine base 1, and a plurality of coating devices 2 are arranged along the length direction of the machine base 1; A drying seat 15 is provided on the machine base 1 between two adjacent coating devices 2, wherein the core rod is preferentially subjected to a heat treatment process and a surface polishing process to remove oil and particles on the surface of the core rod. Its general specification length is the size of a cold-rolled seamless pipe, and can be classified into the following categories: specification: Cr12Φ50-400, HRC (hardness) 53°-58°, specification: H13Φ40-700, HRC (hardness) 51°-56°, specification: gcr3MoΦ100-700, HRC (hardness) 52°-57°; multiple coating devices 2 can sequentially coat the surface of the core rod. After completing a single coating, the core rod can pass through the drying seat 15 for surface drying treatment, thereby realizing a layer-by-layer coating process on the surface of the core rod.

[0017] In this embodiment, the mandrel transmission mechanism 13 is divided into two groups distributed in parallel. A bottom plate 3 is provided on the machine base 1 on one side of each mandrel transmission mechanism 13. An adjustment support 31 is slidably mounted on the bottom plate 3. A rotating shaft 32 is horizontally rotatably connected to the adjustment support 31. A cylinder 33 is coaxially fixed to one end of the rotating shaft 32, and a plurality of positioning grooves 34 are evenly distributed on the outer circumference of the cylinder 33. A core rod clamp 35 is installed at both ends of each positioning groove 34. When the core rod is transferred to the machine base 1 through the loading mechanism 11, one of the core rod transmission mechanisms 13 transmits the core rods horizontally one by one. When the core rod is moved to the bottom of the cylinder 33, the core rod clamp 35 on the cylinder 33 can clamp the two ends of the core rod and sort the core rod out from the core rod transmission mechanism 13.

[0018] As a preferred embodiment, the coating device 2 is located between two cylinders 33, and the two cylinders 33 rotate synchronously and in the same direction. When the core rod is sorted out from the core rod transmission mechanism 13 through the cylinder 33, the coating device 2 can clamp and coat the core rod in coordination with the rotation of the cylinder 33, and the core rod is separated from the cylinder 33. When the core rod is coated, it can be clamped at the end by the other cylinder 33 through the core rod clamp 35 provided on its surface, and then the core rod is transferred to the corresponding core rod transmission mechanism 13 below it, and the core rod transmission mechanism 13 horizontally transmits the core rod to the drying box for proper drying.

[0019] In this embodiment, a hot air box 16 is installed on the lower end surface of the drying seat 15. The hot air box 16 adopts a PID temperature control system, the air outlet wind speed is adjustable (0.5m / s-3m / s), the temperature range is 50℃-200℃, and is equipped with an infrared temperature measurement module to monitor the coating curing status in real time.

[0020] In this embodiment, the coating device 2 includes an upper fixing frame 21, which is fixed below the crossbeam frame 14. A mounting groove is provided inside the upper fixing frame 21. A central shaft 22 is rotatably connected to the mounting groove. A coupling cylinder 23 is fixed to the central shaft 22. A plurality of inner notches 24 are distributed around the circumference of the coupling cylinder 23. A coating plate 4 is installed on the inner wall of each of the inner notches 24, and a coating layer 41 is embedded in the coating plate 4. It should be noted that the number of inner notches 24 on the coupling cylinder 23 is equal to the number of positioning grooves 34, so that the coupling cylinder 23 can cooperate with the two cylinders 33 to transfer and coat the core rods one by one.

[0021] In this embodiment, each of the coating plates 4 is rotatably connected to the coupling cylinder 23. A fixed shaft plate 25 is embedded in the coupling cylinder 23 on one side of each inner notch 24 close to the center of the circle. Two guide shafts 26 are provided in parallel on the fixed shaft plate 25 and are slidably connected to the coupling cylinder 23 through the guide shafts 26. Two support rods 27 are symmetrically hinged on both sides of the fixed axis plate 25, and the other end of each support rod 27 is correspondingly connected to the coating plate 4; A plurality of telescopic guide rods 28 corresponding to the inner notches 24 are radially distributed in the coupling cylinder 23, and the output ends of the telescopic guide rods 28 are connected to the fixed shaft plate 25. When the telescopic guide rods 28 are under contraction control, the two coating plates 4 in the inner notches 24 can reduce the distance between them under deflection, thereby forming a clamping effect on the mandrel. It should be noted that the coating plates 4 are all clamped and contacted on the surface of the mandrel body, while the mandrel clamping claws 35 are clamped on the end of the mandrel, and the two do not interfere with each other. A plurality of ball grooves are arranged on both sides of the coating layer 41 on one end surface of the coating plate 4 , and balls 42 are rotatably connected in the ball grooves, and the balls 42 can form a rolling contact effect with the surface of the core rod.

[0022] As a preferred embodiment, two mounting plates 5 are symmetrically fixed on the bottom wall of the inner notch 24, one of the mounting plates 5 being rotatably provided with a self-rotating wheel 51, the self-rotating wheel 51 being in contact with the outer peripheral wall of the mandrel, so that when the self-rotating wheel 51 rotates, it can drive the mandrel to rotate synchronously, so that the coating layer 41 can fully coat the surface of the mandrel; The mounting plate 5 is horizontally slidably connected to a side plate 52 , which is arranged parallel to the axial end face of the coupling cylinder 23 . A pulse cylinder 53 is laterally fixed on the mounting plate 5 , and the telescopic end of the pulse cylinder 53 is connected to the side plate 52 .

[0023] In this embodiment, the two pulse cylinders 53 work in conjunction with each other and control the mandrel to move back and forth along the length direction of the coating plate 4 through the side plate 52 at a multi-stage telescopic frequency. In particular, during the coating process, the two pulse cylinders 53 can make the mandrel slide back and forth axially at different amplitudes and frequencies under multi-stage frequency control, thereby ensuring coating uniformity and coverage integrity. The coating layer 41 has arranged and distributed liquid channels 43 , and the liquid channels 43 are externally connected to coating liquid pipes (not shown in the figure) that can continuously transport lubricating raw materials to the liquid channels 43 .

[0024] In this embodiment, the coating plate 4 has a plurality of protrusions evenly distributed thereon, and a hole groove 44 is formed in the coating layer 41. The protrusions and the hole groove 44 are fitted together, and a shaft sleeve 45 is embedded and fixed in each protrusion. A liquid guide shaft 46 is slidably connected in the shaft sleeve 45, and an inner spring 47 is provided between the liquid guide shaft 46 and the shaft sleeve 45. A ball 48 is rollingly connected to one end of the liquid-guiding shaft 46. A flow cavity 49 is defined in the liquid-guiding shaft 46. A plurality of micropores are distributed on the surface of the flow cavity 49. An ultrasonic vibrator 410 is integrated in the convex edge, and the output end of the ultrasonic vibrator 410 is connected to the liquid guiding shaft 46, wherein the ultrasonic vibrator 410 can drive the liquid guiding shaft 46 to perform axial high-frequency vibration (amplitude 5μm-50μm) during operation, so that the ball 48 at the end of the liquid guiding shaft 46 can press the lubricating material on its surface onto the surface of the core rod, so that a continuous, uniform and highly adhesive coating layer is formed on the surface of the core rod; and as the core rod rotates at different speeds and slides axially back and forth at different frequencies, the coating layer on its surface presents a spiral distribution of different densities and curves, and finally presents a press-coated thickened texture, so that the lubricating material can form an adhesion base layer on the surface of the core rod, which is convenient for improving the subsequent coating adhesion effect and enhances the durability of the lubricating coating to a certain extent.

[0025] A process for applying a lubricating coating to a mandrel comprises the following steps: S1. The mandrel is pretreated to remove oil, impurities or other residues on the surface to ensure a clean surface, and then the loading mechanism 11 delivers the mandrel to the starting end of the base 1, at which point the mandrel is horizontally transmitted along its axial direction; S2. The mandrel is horizontally transferred by the mandrel transfer mechanism 13. When it is displaced to the bottom of the cylinder 33, the cylinder 33 clamps the mandrel at both ends through the mandrel clamp 35; S3. The mandrel rises as the cylinder 33 rotates. The coating plate 4 in the coating device 2 rotates in conjunction with the coupling 23 to clamp the mandrel body. At this time, the coating layer 41 contacts the outer surface of the mandrel, and the rotating wheel 51 is in full contact with the outer wall of the mandrel. S4. The rotating wheel 51 drives the mandrel to rotate autonomously according to the coating process so that the coating layer 41 completely coats the entire mandrel. The two pulse cylinders 53 on the mounting plate 5 can drive the mandrel to slide axially back and forth between the coating layers 41 at a specified frequency under telescopic coordination. At this time, the liquid-guiding shafts 46 in each convex edge vibrate at a high frequency during operation of the ultrasonic vibrator 410, and the balls 48 at their ends contact the surface of the mandrel. The lubricant is then applied to the mandrel surface through the balls 48 by the flow chamber 49. This allows the balls 48 at the ends of the liquid-guiding shafts 46 to press the lubricant onto the mandrel surface, forming a continuous, uniform, and highly adherent coating layer on the mandrel surface. S5. After the coating is completed, the mandrel is clamped by the mandrel clamp 35 on both ends of the mandrel by the other side of the cylinder 33, and as the cylinder 33 rotates, the mandrel is transported to the corresponding side of the mandrel transmission mechanism 13; S6. The preliminary coated mandrel is dried by the drying seat 15 through the hot air box 16 to blow out a high-temperature air flow to quickly dry the coating; S7. Repeat S2-S6 to achieve multi-layer coating using multiple coating devices 2 until the target coating thickness is reached. The coating thickness and number of each layer can be dynamically adjusted according to the use requirements of the mandrel. After each layer is coated, a coating thickness and uniformity inspection step can be added to ensure that each coating layer meets the process requirements and avoid overall coating failure due to single layer quality issues. S8. The feeding mechanism 12 transfers the finished core rods to the collection area for convenient quality inspection and sorting.

[0026] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A mandrel lubricating coating coating device, characterized in that: It comprises a machine base (1), one side of which is provided with a loading mechanism (11), the other side of the machine base (1) is provided with a feeding mechanism (12), and a crossbeam (14) is fixed horizontally above the crossbeam; A core rod transmission mechanism (13) is provided in the middle of the upper end surface of the machine base (1), and a plurality of coating devices (2) are arranged along the length direction of the machine base (1); A drying seat (15) is provided on the machine base (1) between two adjacent coating devices (2).

2. A mandrel lubricating coating coating device according to claim 1, characterized in that: The core rod transmission mechanism (13) is divided into two groups distributed in parallel. A bottom plate (3) is provided on one side of each core rod transmission mechanism (13) on the machine base (1). An adjustment support (31) is slidably mounted on the bottom plate (3). A rotating shaft (32) is horizontally rotatably connected to the adjustment support (31). A cylinder (33) is coaxially fixed to one end of the rotating shaft (32), and a plurality of positioning grooves (34) are evenly distributed on the outer circumference of the cylinder (33), and a core rod clamp (35) is installed at both ends of each positioning groove (34).

3. The mandrel lubricating coating coating device according to claim 2, characterized in that: The coating device (2) is located between two cylinders (33), and the two cylinders (33) rotate synchronously, and their rotation directions are consistent.

4. The mandrel lubricating coating coating device according to claim 2, characterized in that: A hot air box (16) is installed on the lower end surface of the drying seat (15).

5. The mandrel lubricating coating coating device according to claim 4, characterized in that: The coating device (2) comprises an upper fixing frame (21) fixed below the crossbeam frame (14); a mounting groove is provided inside the upper fixing frame (21); a central shaft (22) is rotatably connected in the mounting groove; a coupling cylinder (23) is fixed on the central shaft (22); and a plurality of inner notches (24) are distributed around the circumference of the coupling cylinder (23); A coating plate (4) is installed on the inner wall of each inner notch (24), and a coating layer (41) is embedded in the coating plate (4).

6. The mandrel lubricating coating coating device according to claim 5, characterized in that: Each of the coating plates (4) is rotatably connected to the coupling cylinder (23), and a fixed shaft plate (25) is embedded in the coupling cylinder (23) at one side of each of the inner notches (24) close to the center of the circle. Two guide shafts (26) are arranged in parallel on the fixed shaft plate (25), and the fixed shaft plate (25) is slidably connected to the coupling cylinder (23) through the guide shafts (26); Two support rods (27) are symmetrically hinged on both sides of the fixed axis plate (25), and the other end of each support rod (27) is correspondingly connected to the coating plate (4); A plurality of telescopic guide rods (28) corresponding to the inner notches (24) are radially distributed inside the coupling cylinder (23), and the output ends of the telescopic guide rods (28) are connected to the fixed shaft plate (25); A plurality of ball grooves arranged and distributed are provided on one end surface of the coating plate (4) on both sides of the coating layer (41), and balls (42) are rotatably connected in the ball grooves.

7. The mandrel lubricating coating coating device according to claim 6, characterized in that: Two mounting plates (5) are symmetrically fixed on the bottom wall of the inner notch (24), one of the mounting plates (5) being provided with a rotating wheel (51) which is rotatably arranged thereon, and the rotating wheel (51) is in contact with the outer peripheral wall of the core rod; The mounting plate (5) is horizontally slidably connected to a side plate (52), the side plate (52) is arranged parallel to the axial end surface of the coupling cylinder (23), and a pulse cylinder (53) is transversely fixed on the mounting plate (5), and the telescopic end of the pulse cylinder (53) is connected to the side plate (52).

8. The mandrel lubricating coating coating device according to claim 7, characterized in that: The two pulse cylinders (53) work in conjunction with each other and control the core rod to move back and forth along the length direction of the coating plate (4) through the side plate (52) at a multi-stage telescopic frequency; Arranged and distributed liquid channels (43) are provided in the coating layer (41), and the liquid channels (43) are externally connected to a coating liquid pipe.

9. The mandrel rod lubricating coating coating device according to claim 7, characterized in that: The coating plate (4) is evenly distributed with a plurality of convex edges, and a hole groove (44) is provided in the coating layer (41), the convex edges and the hole groove (44) are fitted together, a shaft sleeve (45) is embedded and fixed in each convex edge, a liquid guide shaft (46) is slidably connected in the shaft sleeve (45), and an inner spring (47) is provided between the liquid guide shaft (46) and the shaft sleeve (45); One end of the liquid-guiding shaft (46) is connected to a ball (48) in a rolling manner. A flow cavity (49) is provided in the liquid-guiding shaft (46), and a plurality of micropores are distributed on the surface of the flow cavity (49). An ultrasonic vibrator (410) is integrated in the convex edge, and an output end of the ultrasonic vibrator (410) is connected to the liquid guide shaft (46).

10. A process for coating a mandrel lubricating coating, which uses the mandrel lubricating coating device according to claim 9, characterized in that: It includes the following steps: S1. The loading mechanism (11) transports the mandrel to the starting end of the machine base (1), at which time the mandrel is transported horizontally along its axial direction; S2. The mandrel is horizontally transported by the mandrel transport mechanism (13). When the mandrel is moved to the bottom of the cylinder (33), the cylinder (33) clamps the two ends of the mandrel through the mandrel clamp (35); S3. The core rod rises as the cylindrical barrel (33) rotates, and the coating plate (4) in the coating device (2) clamps the core rod body in cooperation with the rotation of the coupling barrel (23). At this time, the coating layer (41) contacts the outer surface of the core rod, and the rotating wheel (51) is in full contact with the outer peripheral wall of the core rod; S4. The self-rotating wheel (51) drives the core rod to rotate autonomously according to the coating process so that the coating layer (41) completely coats the entire core rod, wherein the two pulse cylinders (53) on the mounting plate (5) can drive the core rod to slide axially back and forth between the coating layers (41) at a specified frequency under telescopic cooperation. At this time, the liquid guide shaft (46) along each convex edge vibrates at a high frequency during the operation of the ultrasonic vibrator (410), and the ball (48) at its end contacts the surface of the core rod so that the lubricating material is coated on the surface of the core rod through the ball (48) by the flow chamber (49); S5. After the coating is completed, the mandrel is clamped at both ends by the cylinder (33) on the other side through the mandrel clamp (35), and the mandrel is transported to the mandrel transmission mechanism (13) on the corresponding side as the cylinder (33) rotates. S6. The initially coated mandrel is blown out a high-temperature air flow from the drying seat (15) through the hot air box (16) to quickly dry the coating; S7. Repeat S2-S6 to achieve multi-layer coating through multiple coating devices (2) until the target coating thickness is reached; S8. The feeding mechanism (12) transfers the finished core rods to the collection area for easy quality inspection and sorting.

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