Metal rod automatic plastic dipping production line and processing technology

Abstract

The present invention relates to an automatic plastic dipping production line and processing technology for metal rods, characterized in that it comprises: a first frame, a second frame, a first mechanical arm, a second mechanical arm, a first plastic dipping device, a second plastic dipping device, a first heating device, a second heating device, a rotary dripping device, a circulation device, a feeding device, a vacuum degassing machine, a feeding mechanism and an exhaust system of the same structure installed in a glass sealed room, and an electric control box is respectively arranged outside the glass sealed room; the rotary dripping device is located in the middle of the first frame and the second frame, the first plastic dipping device is externally connected with a circulation device, and the first plastic dipping device and the second plastic dipping device are respectively connected with a feeding device at the bottom. The advantages are: the mechanical automation of the metal rod plastic dipping operation is realized, which not only simplifies the operation process, reduces the manual operation links, greatly improves the production efficiency and the product plastic dipping quality, but also reduces the pollution of the production environment and avoids safety accidents during operation.

Description

Technical Field

[0001] The invention belongs to the technical field of medical device processing, and in particular relates to an automatic plastic dipping production line and a processing technology for metal rods. Background Art

[0002] In the medical device manufacturing industry, the molding of many products requires the use of the dipping process, such as a variety of clinical cannulas with steel wire reinforcement linings and variable diameter structures. Since the plastic itself has a certain flexibility and can be bent freely, some areas of the tube body need to be embedded with steel wire reinforcement linings in the tube wall to ensure that the tube body is resistant to extrusion and bending. The ends of the tube body need to be made into different sizes according to the requirements of use. At the same time, the size requirements of the cannula are relatively strict, which requires a production process for cannulas with discontinuous reinforcement and variable diameter.

[0003] There are many kinds of traditional reinforced plastic tubes, such as: embedded reinforced wire hose, braided hose, spiral tube, corrugated tube, etc. Most of them are continuously reinforced equal-diameter catheters, most of which are extruded, while medical reinforced variable-diameter catheters require discontinuous reinforcement of the tube body, the steel wire is discontinuous, and the reinforced tube body is a variable-diameter structure with a certain taper change. Therefore, it is difficult to complete using ordinary composite extrusion processing. At present, the above-mentioned cannula is mostly made by the dip molding method. The production principle is to dip the mold with a steel wire into a liquid paste made of emulsion resin as the raw material, and use a repeated dipping and baking operation method to make it.

[0004] The basic process flow of liquid dipping technology currently used in the market is: pre-treatment (sandblasting, degreasing, rust removal, phosphating, bluing or electroplating) → hanger → preheating (150-220℃, 5-15 minutes) → dipping → baking and plasticization (160~280℃, 5-15 minutes) → cooling (air cooling or water cooling) → lower hanger → demoulding → post-processing. Among them, the core process to ensure product quality is baking and plasticization, which requires strict requirements on the heating device of the dipping equipment.

[0005] In the known technology, the heating device of the plastic dipping equipment is divided into electric type, diesel type, coal-fired type and gas type according to its heating method. Diesel type, coal-fired type and gas-fired type generally require an intermediate medium for indirect heating, which consumes heat and has a relatively slow heating speed and cooling speed. In addition, diesel type and coal-fired type will produce harmful gases that are not conducive to production, and the heating uniformity of the gas-fired type is worse than that of electric heating. The above heating methods are mostly used in industrial production and are not suitable for the production of medical products. The medical industry has higher requirements for equipment accuracy and higher requirements for environmental cleanliness. The commonly used electric heating methods can be divided into two methods: heating tubes and high-frequency heating. High-frequency heating has better uniformity than heating tubes, but the energy consumption remains high.

[0006] Existing plastic dipping equipment is tailored according to product characteristics, and can be roughly divided into three types: manual, semi-automatic and fully automatic. Most of these plastic dipping equipment are used for surface coating of hardware and electromechanical products, and there are no great requirements for the color, uniformity and hardness of the finished plastic dipping products. However, the qualified rate of medical products produced using the aforementioned equipment is low and cannot meet medical needs. Manual or semi-automatic plastic dipping equipment is mostly manually operated, which not only has a cumbersome operation process and high labor intensity, but also poses safety risks to operators during use, which can easily cause safety accidents.

[0007] In summary, the shortcomings of the above-mentioned dipping equipment and processes include the following: 1. The medical industry has high requirements for molding process control, and the manufacturing process and equipment are complex, which are difficult to meet with existing equipment; 2. The equipment usually consumes a lot of energy and has poor precision; 3. The raw material baking and molding process releases a large amount of irritating smoke and dust, which seriously pollutes the operating environment; 4. The baking equipment needs to be opened frequently during operation, and the temperature range fluctuates greatly, which affects the temperature consistency and easily causes uneven plasticization; 5. The raw materials have high requirements, and the paste resin is prone to produce bubbles, which in turn affects the product quality. Summary of the invention

[0008] In order to solve the technical problems existing in the known technology, the present invention provides an automatic metal rod dipping production line and processing technology with reasonable structural design, easy use, reduced production environmental pollution, greatly improved production efficiency, low energy consumption, high control accuracy and good dipping effect.

[0009] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is:

[0010] An automatic plastic dipping production line for metal rods, characterized in that it comprises: a first frame, a second frame, a first mechanical arm, a second mechanical arm, a first plastic dipping device, a second plastic dipping device, a first heating device, a second heating device, a rotary dripping device, a circulation device, a feeding device, a vacuum degassing machine, a feeding mechanism and an exhaust system installed in a glass sealed room, and an electric control box for controlling the operation of the first frame and the second frame is respectively provided outside the glass sealed room;

[0011] The first frame and the second frame have the same structure and are symmetrically arranged in a glass sealed room. A rotating dripping device is provided in the middle of the first frame and the second frame.

[0012] The first mechanical arm and the second mechanical arm have the same structure;

[0013] The first frame is further provided with a first plastic dipping device and a first heating device, and the second frame is further provided with a second plastic dipping device and a second heating device, the first plastic dipping device and the second plastic dipping device have the same structure, and the first heating device and the second heating device have the same structure;

[0014] The first plastic dipping device is externally connected to a circulation device, and the first plastic dipping device and the second plastic dipping device are respectively connected to a feeding device at their lower parts;

[0015] The vacuum degassing machine is arranged outside the glass sealed room.

[0016] Preferably, the second robot arm installed on the second frame includes an X-axis formed by two mutually parallel beams of the frame, a Y-axis dynamically connected to the two X-axis in the horizontal direction at 90°, and a clamping robot arm dynamically connected to the Y-axis in the vertical direction, the axial inner sides of the two X-axis are respectively fixed with an X-axis rack, an X-axis guide rail and an X-axis slider matched with the X-axis guide rail, and X-axis servo motors and X-axis gears are installed at both ends of the Y-axis, the X-axis servo motor is connected to the X-axis gear, and the X-axis gear is meshed with the X-axis rack ; A Y-axis rack and a Y-axis guide rail are installed in the axial direction of the Y-axis, and the clamping robot arm is equipped with a Y-axis servo motor, a Y-axis slider and a Y-axis gear that cooperate with the Y-axis guide rail. The Y-axis servo motor is connected to the Y-axis gear, and the Y-axis gear is meshed with the Y-axis rack; a clamping robot arm rack, a clamping robot arm guide rail, a clamping robot arm slider, a clamping robot arm servo motor and a clamping robot arm gear are installed on one side of the clamping robot arm, and a cylinder and a pneumatic clamp for clamping a metal rod to pass through a hanging plate are provided at the lower end of the clamping robot arm.

[0017] The present invention can also adopt the following technical solutions:

[0018] Preferably, the first plastic dipping device and the second plastic dipping device are located on both sides of the rotating dripping device, the first plastic dipping device comprises a plastic dipping box, a heating belt, a feed port, a discharge port, a plastic dipping box tray and a weight sensing mechanism, the plastic dipping box is embedded in the weight sensing mechanism, a temperature sensor is provided on the outer side of the weight sensing mechanism, the heating belt is evenly wound around the outer wall of the plastic dipping box, a feed port is provided on the upper side of the box body of the plastic dipping box, a discharge port is provided on the lower side of the box body of the plastic dipping box, and a plastic dipping box tray is installed at the bottom of the plastic dipping box.

[0019] Preferably, the rotating dripping device includes a rotating table, a rack, a rotating motor and a waste liquid storage box. The rotating table is provided with four racks arranged at 90 degrees to each other. The rotating motor is connected to the rotating table, and the bottom of each rack is connected to the waste liquid storage box. The rotating table is provided with waste liquid discharge outlets corresponding to the positions of the four racks.

[0020] Preferably, the first heating device is adjacent to the first plastic dipping device, and the second heating device is adjacent to the second plastic dipping device. Each of the heating devices includes a heating cavity, a heating tube, a central heating column, a heating cavity upper cover, a heating cavity upper cover opening mechanism and an exhaust duct. The heating tubes are distributed at equal angles in the circular heating cavity, the central heating column is arranged in the center of the heating cavity, the heating cavity upper cover opening mechanism is located on one side of the heating cavity, and the exhaust duct is directly connected to the exhaust system.

[0021] Preferably, the circulation device comprises a circulation pneumatic diaphragm pump and a circulation pipeline, and both ends of the circulation pipeline are respectively connected to the dipping box of the first dipping device.

[0022] Preferably, the feeding device comprises a dipping liquid storage tank, a feeding pipeline and a feeding pneumatic diaphragm pump, the feeding pipeline is respectively connected to the first dipping device, the second dipping device and the dipping liquid storage tank, and a feeding pneumatic diaphragm pump is installed on the feeding pipeline.

[0023] Preferably, the feeding mechanism comprises a feeding rack and a metal rod hanging plate placed on the feeding rack, and the metal rod hanging plate is provided with a plurality of insertion holes.

[0024] A processing technology of an automatic dipping production line for metal rods, characterized in that it includes the following steps: setting dipping process parameters, preheating, loading in a second rack, dipping the metal rod once, baking the metal rod once, manually attaching a spring reinforcing liner, dipping the metal rod twice, dripping, baking the metal rod twice, dipping the metal rod three times, baking three times, demoulding and product exporting;

[0025] S1. Setting of dipping process parameters. First, set the parameters, including: the negative pressure of the vacuum degassing machine is between 80-100Mpa, the dipping speed and the discharging speed are maintained at 10-30mm / s, the dipping holding time is generally 10-20s, the baking time is within 3min-8min, and the static time of the dripping process is 5-30min; then select the corresponding program, and the PLC executes the program to control the movement of each device in the production line;

[0026] S2, preheating, preheating the first heating device, the second heating device and the second dipping device, so that the preheating temperature of the first heating device and the second heating device is maintained between 150°C and 230°C, and the temperature of the dipping liquid in the second dipping device is maintained at 45±5°C;

[0027] S3, loading the material in the second rack, the operator first removes the metal rod hanging plate from the material rack in the second rack, inserts the metal rods to be impregnated into the insertion holes of the metal rod hanging plate in sequence, passes the heads of the metal rods through the metal rod hanging plate and fixes the metal rods to the metal rod hanging plate, and then places the metal rod hanging plate on the material rack;

[0028] S4, the metal rod is dipped once. First, the X-axis servo motor of the second robot arm drives the Y-axis and the clamping robot arm to produce horizontal displacement relative to the X-axis. The Y-axis servo motor is used to adjust the clamping robot arm to the top of the material rack. The servo motor of the clamping robot arm is started to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod through the hanging plate. Then, the X-axis servo motor controls the Y-axis and the clamping robot arm to move horizontally to the top of the second dipping device. The servo motor of the clamping robot arm controls the clamping robot arm to move downward and immerse it in the dipping box of the second dipping device to complete the dipping operation of the metal rod. The dipping time of the metal rod is generally 10-20s, and the dipping speed and the discharging speed are maintained at 10-30mm / s.

[0029] S5, baking the metal rod after the first plastic dipping, start the heating cavity cover cylinder of the heating cavity cover opening mechanism to open the heating cavity cover, control the Y axis and the clamping robot arm through the X axis servo motor to move the metal rod after the first plastic dipping to the top of the heating cavity of the second heating device, and then control the clamping robot arm servo motor to move the clamping robot arm downward into the heating cavity of the second heating device to bake the metal rod after the plastic dipping, the baking temperature is set in the range of 150°C-230°C according to different models of products, and the baking time is maintained within 3min-8min;

[0030] S6, manually set the spring reinforcing lining, set the spring reinforcing lining on the metal rod after the first baking, control the clamping robot arm upward through the servo motor of the clamping robot arm, take out the metal rod that is basically shaped after baking from the heating chamber of the second heating device, and then control the Y axis and the clamping robot arm through the X axis servo motor to place the metal rod tray on the material rack, and after cooling for 15-30 minutes, remove the metal rod from the insert plate, and complete the spring setting operation through manual operation;

[0031] S7, secondary plastic dipping of metal rods, insert the metal rods with spring reinforcement lining into the insertion holes of the metal rod hanging plate in sequence, make the head of the metal rod pass through the metal rod hanging plate and fix the metal rod to the metal rod hanging plate, then place the metal rod hanging plate on the material rack, drive the Y axis and the clamping robot arm to produce horizontal displacement relative to the X axis through the X axis servo motor of the second robot arm, adjust the clamping robot arm to the top of the material rack through the Y axis servo motor, start the clamping robot arm servo motor to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod hanging plate, then control the Y axis and the clamping robot arm to translate to the top of the second plastic dipping device through the X axis servo motor, control the clamping robot arm servo motor to move downward and immerse it in the plastic dipping box of the second plastic dipping device to complete the secondary plastic dipping operation of the metal rod, the metal rod plastic dipping holding time is generally 10-20s, and the plastic dipping speed and the material discharging speed are maintained at 10-30mm / s;

[0032] S8, the dripping of the metal rod after the secondary dipping is controlled by the X-axis servo motor of the second robot arm to move the Y-axis and the clamping robot arm to the rack of the rotating dripping device for dripping, and the static time of the dripping process is 5-30 minutes. After the static time is completed, the rotating motor is controlled to rotate 180°, so that the metal rod on the rack passes through the hanging plate and moves to the right side of the first heating device;

[0033] S9, baking the metal rod after secondary dipping, start the heating cavity cover cylinder of the heating cavity cover opening mechanism of the first heating device to open the heating cavity cover, and control the Y axis and the clamping robot arm through the X axis servo motor of the first robot arm to move the metal rod after dipping from the rotating dripping device to the top of the heating cavity of the first heating device, and then control the clamping robot arm through the servo motor of the clamping robot arm to move downward into the heating cavity of the first heating device to bake the metal rod after dipping. The baking temperature is set in the range of 150°C-230°C according to different models of products, and the baking time is maintained within 3min-8min;

[0034] S10, three times of dipping the metal rod, the X-axis servo motor of the first robot arm controls the Y-axis and the clamping robot arm to move the metal rod after the second baking from the heating chamber of the first heating device to the top of the first dipping box, and then the servo motor of the clamping robot arm controls the clamping robot arm to move downward into the first dipping box to complete the three times of dipping;

[0035] S11, baking the metal rod after the third dipping, the operation is the same as the second baking procedure of the metal rod;

[0036] S12, demoulding, the metal rod baked three times is taken out from the heating chamber by the Y-axis servo motor of the first robot arm and the servo motor of the clamping robot arm, and then the Y-axis and the clamping robot arm are moved to the material rack in the first rack by the X-axis servo motor to be cooled, and the metal rod after the plastic dipping is taken out from the metal rod hanging plate for demoulding;

[0037] S13, product export, complete the intubation product export through a series of manual operations.

[0038] The advantages and positive effects of the present invention are as follows: since the present invention adopts the above technical scheme, that is, the production line adopts a three-axis mechanical arm structure and a corresponding servo motor to accurately control the transmission position and transmission speed of the clamping manipulator, ensure the accuracy of the immersion speed and exit speed of the metal rod dipping, and is suitable for the dipping of various specifications of metal rods with a diameter of 20mm and a length of 700mm; the PLC executes the program to control the movement of each device in the production line, complete the cooperation of the production process, and realize the automation of metal rod dipping. Three-section heating tubes and a central heating column are used in the heating device. The heating tubes are distributed at equal angles in the circular heating cavity body, and the heating tubes are distributed in three sections of upper, middle and lower in the vertical direction. There are precise temperature sensors inside, and the required heating sections can be selectively opened according to the length of the dipping mold. At the same time, the system can also make an advance judgment according to the temperature change trend, perform interpolation operations, reduce the temperature fluctuation range, make the material plasticized evenly, maintain low energy consumption, and use PID instructions to control temperature fluctuations, improve temperature uniformity, and ensure product quality. A vacuum degassing and circulation system is used to timely remove bubbles formed in the raw materials or during the production process to provide product quality and qualified rate. The glass sealed room and exhaust system are used to quickly and directionally discharge the smoke and dust generated during the production process and enter the waste gas treatment equipment, reducing the harm of smoke to the human body and the pollution to the environment during the dipping and heating process. According to the requirements of medical intubation, the present invention has carried out targeted design of the production line and realized the mechanical automation of the metal rod dipping operation, which can not only simplify the operation process, reduce manual operation links, and reduce labor intensity, but also avoid safety accidents during operation and ensure the personal safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a front view of the present invention;

[0040] Figure 2 yes Figure 1 A top view of

[0041] Figure 3 It is a structural schematic diagram of the feeding device of the present invention;

[0042] Figure 4 This is a front view of the assembly structure of the second frame and the second mechanical arm of the present invention;

[0043] Figure 5 yes Figure 4 A top view of

[0044] Figure 6 It is a schematic diagram of the structure of the circulation device of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the heating device of the present invention;

[0046] Figure 8It is a structural schematic diagram of the plastic dipping device of the present invention;

[0047] Fig. 9 It is a front view of the structure of the rotary dripping device of the present invention;

[0048] Fig.10 yes Fig. 9 A top view of

[0049] Fig.11 Schematic diagram of the plastic dipping device of the present invention using a paddle structure;

[0050] Fig.12 yes Fig.11 A top view of

[0051] Fig.13 It is a state diagram of the second mechanical arm moving to above the feeding mechanism during operation of the present invention;

[0052] Fig.14 It is a state diagram of the second mechanical arm moving to above the second plastic dipping device during operation of the present invention;

[0053] Fig.15 It is a state diagram of the second mechanical arm moving to the rotating dripping device during the operation of the present invention;

[0054] Fig.16 It is a state diagram of the second robot arm moving to the second heating device during the operation of the present invention;

[0055] In the figure: 1, first frame; 2, first mechanical arm;

[0056] 3. First plastic dipping device; 3-1. Heating belt; 3-2. Plastic dipping box; 3-3. Feed inlet; 3-4. Discharge outlet; 3-5. Plastic dipping liquid box tray; 3-6. Weight sensor; 3-7. Temperature sensor; 3-8. Paddle;

[0057] 4. First heating device; 4-1. Heating cavity; 4-2. Heating tube; 4-3. Central heating column; 4-4. Heating cavity upper cover; 4-5. Support frame; 4-6. Heating cavity upper cover cylinder; 4-7. Exhaust pipeline;

[0058] 5. Rotating dripping device; 5-1. Rotating motor; 5-2. Storage rack; 5-3. Rotating table; 5-4. Waste liquid storage box; 5-5. Waste liquid discharge outlet;

[0059] 6. Second robot arm; 6-1. X-axis; 6-2. X-axis rack; 6-3. X-axis slider; 6-4. X-axis servo motor; 6-5. X-axis gear; 6-6. X-axis guide rail; 6-7. Y-axis; 6-8. Y-axis rack; 6-9. Y-axis slider; 6-10. Y-axis servo motor Y; 6-11. Y-axis gear; 6-12. Clamping robot arm servo motor; 6-13. Clamping robot arm rack; 6-14. Clamping robot arm; 6-15. Pneumatic clamp; 6-16. Clamping robot arm gear; 6-17. Clamping robot arm guide rail; 6-18. Support column; 6-19. Cylinder; 6-20. Y-axis guide rail; 6-21. Clamping robot arm slider;

[0060] 7. Second rack; 8. Second heating device; 9. Second plastic dipping device;

[0061] 10. Circulation device; 10-1. Circulation pneumatic diaphragm pump; 10-2. Circulation pipeline;

[0062] 11. Feeding device; 11-1. Feeding pneumatic diaphragm pump; 11-2. Feeding pipeline; 11-3. Plastic dipping liquid storage tank;

[0063] 12. Vacuum degassing machine; 13. Electric control box; 14. Material rack; 15. Metal rod for hanging tray.

[0064] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0065] See also Figure 1-Figure 12 ,

[0066] A metal rod automatic plastic dipping production line comprises: a first frame 1, a second frame 7, a first mechanical arm 2, a second mechanical arm 6, a first plastic dipping device 3, a second plastic dipping device 9, a first heating device 4, a second heating device 8, a rotary dripping device 5, a circulation device 10, a feeding device 11, a vacuum degassing machine 12, a feeding mechanism and an exhaust system installed in a glass sealed room, and electric control boxes 13 for controlling the operation of the first frame and the second frame are respectively arranged outside the glass sealed room.

[0067] The first frame 1 and the second frame 7 have the same structure and are symmetrically arranged in a glass sealed room. A rotating dripping device 5 is provided in the middle of the first frame and the second frame.

[0068] The first robotic arm 2 and the second robotic arm 6 have the same structure.

[0069] The first frame is further provided with a first plastic dipping device 3 and a first heating device 4, the second frame is further provided with a second plastic dipping device 9 and a second heating device 8, the first plastic dipping device and the second plastic dipping device have the same structure, and the first heating device and the second heating device have the same structure.

[0070] The first dipping device is externally connected to a circulation device 10, and the first dipping device and the second dipping device are respectively connected to a feeding device 11 at their lower parts.

[0071] The vacuum degassing machine 12 is arranged outside the glass sealed room.

[0072] Specifically, the second mechanical arm 6 installed on the second frame 7 includes an X-axis 6-1 composed of two parallel beams of the frame, a Y-axis 6-7 connected to the two X-axis horizontally at 90°, and a clamping mechanical arm 6-14 connected to the Y-axis vertically. The axial inner sides of the two X-axis are respectively fixed with an X-axis rack 6-2, an X-axis guide rail 6-6 and an X-axis slider 6-3 matched with the X-axis guide rail, and both ends of the Y-axis are equipped with an X-axis servo motor 6-4 and an X-axis gear 6-5, the X-axis servo motor is connected to the X-axis gear, and the X-axis gear is meshed with the X-axis rack. A Y-axis rack 6-8 and a Y-axis guide rail 6-20 are installed in the axial direction of the Y-axis, and the clamping mechanical arm is equipped with a Y-axis servo motor 6-10, a Y-axis slider 6-9 and a Y-axis gear 6-16 matched with the Y-axis guide rail, the Y-axis servo motor is connected to the Y-axis gear, and the Y-axis gear is meshed with the Y-axis rack. The clamping arm rack 6-13, the clamping arm guide rail 6-17, the clamping arm slider 6-21, the clamping arm servo motor 6-12 and the clamping arm gear 6-16 are installed on one side of the clamping arm. The lower end of the clamping arm is provided with a cylinder 6-19 and a pneumatic clamp 6-15 for clamping the metal rod through the hanging plate. When the clamping arm needs to move left and right in the horizontal direction, the X-axis servo motor 6-4 is started to drive the X-axis gear 6-5 to move along the X-axis rack 6-2. At the same time, the Y-axis 6-7 moves horizontally through the X-axis guide rail 6-6 and the X-axis slider 6-3, thereby driving the clamping arm to move horizontally. When the clamping robot arm needs to move forward and backward in the horizontal direction along the Y-axis, start the Y-axis servo motor 6-10 to drive the Y-axis gear 6-16 to move along the Y-axis rack 6-8. At the same time, the clamping robot arm moves forward and backward in the horizontal direction along the Y-axis through the clamping robot arm guide rail 6-17 and the clamping robot arm slider 6-21, so that the clamping robot arm can move forward and backward in the horizontal direction.

[0073] Specifically, the first plastic dipping device 3 and the second plastic dipping device 9 are located on both sides of the rotating dripping device. The first plastic dipping device includes a plastic dipping box 3-2, a heating belt 3-1, a feed port 3-3, a discharge port 3-4, a plastic dipping box tray 3-5 and a weight sensing mechanism. The plastic dipping box is embedded in the weight sensing mechanism. A weight sensor 3-6 and a temperature sensor 3-7 are installed at the bottom of the weight sensing mechanism, and a temperature measuring probe of the temperature sensor 3-7 is inserted in the plastic dipping box. The heating belt is evenly wound on the outer wall of the plastic dipping box body. A feed port is provided on one side of the plastic dipping box body, and a discharge port is provided on the lower side of the plastic dipping box body. A plastic dipping box tray is installed at the bottom of the plastic dipping box. The feed port and the discharge port are connected to an external plastic dipping liquid storage tank through a pipeline.

[0074] The surface of the second dipping device is wrapped with a heating belt, which can control the temperature of the dipping liquid. The servo motor of the clamping robot arm can control the speed at which the metal rod is immersed in the dipping liquid and the speed at which it withdraws from the dipping liquid. This can obtain products with more stable quality and a higher pass rate than manual operation.

[0075] In order to prevent the viscosity of the solution near the wall of the dipping box from increasing due to the long standing time or long heating time of the dipping liquid, paddles 3-8 can be installed at the bottom of the dipping box of the dipping device 3 in this embodiment to replace the circulation pipeline. The paddles can be screw type, propeller type or turbine type, and the paddles are driven by the motor to rotate and stir the dipping liquid, so that the dipping liquid flows from bottom to top in the dipping box.

[0076] Specifically, the rotary dripping device 5 includes a rotating table 5-1, a rack 5-2, a rotating motor 5-1 and a waste liquid storage box 5-4. The rotating table is provided with four racks arranged at 90 degrees to each other. The rotating motor is connected to the rotating table, and the waste liquid storage box is connected to the bottom of each rack. The rotating table is provided with waste liquid discharge ports 5-5 at the positions corresponding to the four racks. The temperature of the dipping liquid is controlled by a heating belt, and the rotating motor is used to control the speed of the dipping rod dipping into the dipping box and the speed of exiting the dipping box, so that a product with a higher quality and higher pass rate can be obtained compared with manual operation.

[0077] Specifically, the first heating device is adjacent to the first plastic dipping device, and the second heating device is adjacent to the second plastic dipping device. Each heating device includes a heating cavity 4-1, a heating tube 4-2, a central heating column 4-3, a heating cavity cover 4-4, a heating cavity cover opening mechanism and an exhaust pipe 4-7. The heating tubes are distributed at equal angles in the circular heating cavity and are distributed in three sections of upper, middle and lower in the vertical direction. The central heating column is arranged in the center of the heating cavity. The heating cavity cover opening mechanism is located on one side of the heating cavity, and the exhaust pipe is directly connected to the exhaust system. The heating cavity cover opening mechanism includes a support frame 4-5 and a heating cavity cover cylinder 4-6. The heating cavity cover cylinder is mounted on the support frame and connected to the heating cavity cover. The heating cavity cover is closed and opened by the heating cavity cover cylinder, and an I-shaped reinforcing rib is formed on the heating cavity cover.

[0078] Specifically, the circulation device 10 includes a circulation pneumatic diaphragm pump 10-1 and a circulation pipeline 10-2, and both ends of the circulation pipeline are respectively connected to the dipping box of the first dipping device. The circulation pneumatic diaphragm pump draws the dipping liquid from the dipping box 3-2 through the circulation pipeline and then returns it to the dipping box to realize the circulation process of the dipping liquid.

[0079] Specifically, the feeding device 11 includes a plastic dipping liquid storage tank 11-3, a feeding pipeline 11-2 and a feeding pneumatic diaphragm pump 11-1. The feeding pipeline is connected to the first plastic dipping device 3, the second plastic dipping device 9 and the plastic dipping liquid storage tank 11-3 respectively, and a feeding pneumatic diaphragm pump is installed on the feeding pipeline. The plastic dipping liquid storage tank is arranged outside the sealed glass room and is connected to the vacuum degassing machine 12. When the plastic dipping liquid in the plastic dipping box is consumed by about 1 cm of liquid level, the weight sensor 3-6 will feedback an electrical signal to the electric control box 13, and the electric control box will issue a command to start the feeding pneumatic diaphragm pump of the feeding device to extract the plastic dipping liquid in the plastic dipping liquid storage tank and add it to the plastic dipping box.

[0080] The starting end of the feeding device is a plastic dipping liquid raw material pool, and the end is connected to a plastic dipping box. The control panel of the electric control box controls the pneumatic diaphragm pump to suck the plastic dipping liquid from the plastic dipping liquid raw material pool through the numerical changes transmitted by the weight sensor mechanism, and the liquid level of the plastic dipping box is always maintained within a certain range, reducing the tedious operation of manual feeding.

[0081] Specifically, the feeding mechanism comprises a feeding frame 14 and a metal rod hanging plate 15 placed on the feeding frame, wherein a plurality of insertion holes are formed on the metal rod hanging plate. A roller is installed at the bottom of the feeding frame to facilitate the movement of the feeding mechanism.

[0082] See also Figure 13-Figure 16 ,

[0083] A processing technology of an automatic plastic dipping production line for metal rods comprises the following steps:

[0084] Setting of dipping process parameters, preheating, loading into the second rack, first dipping of metal rods, first baking of metal rods, manual installation of spring reinforcement lining, second dipping of metal rods, dripping, second baking of metal rods, third dipping of metal rods, third baking, demoulding and product exporting.

[0085] S1. Setting of dipping process parameters: first set the parameters, including: the negative pressure of the vacuum degassing machine is between 80-100Mpa, the dipping speed and the discharging speed are maintained at 10-30mm / s, the dipping holding time is generally 10-20s, the baking time is within 3min-8min, and the standing time of the dripping process is 5-30min; then select the corresponding program, and the PLC executes the program to control the movement of each device in the production line.

[0086] S2, preheating, preheating of the first heating device, the second heating device and the second dipping device, so that the preheating temperature of the first heating device and the second heating device is maintained between 150°C and 230°C, and the temperature of the dipping liquid in the second dipping device is maintained at 45±5°C.

[0087] S3, loading, the operator first removes the metal rod through-hanging plate from the material rack located in the second rack, inserts the metal rods to be impregnated into the insertion holes of the metal rod through-hanging plate in sequence, passes the heads of the metal rods through the metal rod through-hanging plate and fixes the metal rods to the metal rod through-hanging plate, and then places the metal rod through-hanging plate on the material rack.

[0088] S4. The metal rod is dipped in plastic once. First, the X-axis servo motor of the second robot arm drives the Y-axis and the clamping robot arm to produce horizontal displacement relative to the X-axis. The Y-axis servo motor is used to adjust the clamping robot arm to the top of the material rack. The servo motor of the clamping robot arm is started to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod to pass through the hanging plate. Then, the X-axis servo motor controls the Y-axis and the clamping robot arm to move horizontally to the top of the second dipping device. The servo motor of the clamping robot arm controls the clamping robot arm to move downward and immerse it in the dipping box of the second dipping device to complete the dipping operation of the metal rod. The dipping time of the metal rod is generally 10-20s, and the dipping speed and the discharge speed are maintained at 10-30mm / s.

[0089] S5. Bake the metal rod after the first plastic dipping. Start the heating cavity cover cylinder of the heating cavity cover opening mechanism to open the heating cavity cover. Control the Y axis and the clamping robot arm through the X axis servo motor to move the metal rod after the first plastic dipping to the top of the heating cavity of the second heating device. Then control the clamping robot arm through the clamping robot arm servo motor to move the clamping robot arm downward into the heating cavity of the second heating device to bake the metal rod after the plastic dipping. The baking temperature is set in the range of 150℃-230℃ according to different product models, and the baking time is maintained within 3min-8min.

[0090] S6. Put spring reinforcing lining on the metal rod after one baking, control the clamping robot arm upward through the servo motor of the clamping robot arm, take out the metal rod that is basically shaped after baking from the heating chamber of the second heating device, and place the metal rod tray on the material rack through the X-axis servo motor to control the Y-axis and the clamping robot arm. After cooling for 15-30 minutes, remove the metal rod from the insert plate and complete the spring putting operation through manual operation.

[0091] S7. Secondary plastic dipping of metal rods. Insert the metal rods with spring reinforcement linings into the insertion holes of the metal rod hanging plate in sequence, pass the metal rod heads through the metal rod hanging plate and fix the metal rod to the metal rod hanging plate, then place the metal rod hanging plate on the material rack, drive the Y-axis and the clamping robot arm to produce horizontal displacement relative to the X-axis through the X-axis servo motor of the second robot arm, adjust the clamping robot arm to the top of the material rack through the Y-axis servo motor, start the clamping robot arm servo motor to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod hanging plate, then control the Y-axis and the clamping robot arm to move horizontally to the top of the second plastic dipping device through the X-axis servo motor, control the clamping robot arm servo motor to move downward and immerse it in the plastic dipping box of the second plastic dipping device to complete the secondary plastic dipping operation of the metal rod, and the metal rod plastic dipping holding time is generally 10-20s, and the plastic dipping speed and the material discharging speed are maintained at 10-30mm / s.

[0092] S8, the dripping of the metal rod after the secondary dipping is controlled by the X-axis servo motor of the second robot arm to move the Y-axis and the clamping robot arm to the rack of the rotating dripping device for dripping, and the static time of the dripping process is 5-30 minutes. After the static completion, the rotary motor is controlled to rotate 180 degrees, so that the metal rod on the rack passes through the hanging plate and moves to the right side of the first heating device.

[0093] S9, baking the metal rod after secondary plastic dipping, start the heating cavity cover cylinder of the heating cavity cover opening mechanism of the first heating device to open the heating cavity cover, control the Y axis and the clamping robot arm through the X axis servo motor of the first robot arm to move the metal rod after plastic dipping from the rotating dripping device to above the heating cavity of the first heating device, and then control the clamping robot arm through the servo motor of the clamping robot arm to move downward into the heating cavity of the first heating device to bake the metal rod after plastic dipping. The baking temperature is set in the range of 150℃-230℃ according to different product models, and the baking time is maintained within 3min-8min.

[0094] S10, three dipping of the metal rod, the X-axis servo motor of the first robot arm controls the Y-axis and the clamping robot arm to move the metal rod after the second baking from the heating chamber of the first heating device to above the first dipping box, and then the servo motor of the clamping robot arm controls the clamping robot arm to move downward into the first dipping box to complete the three dipping operations.

[0095] S11. The operation of baking the metal rod after the third dipping is the same as the second baking procedure of the metal rod.

[0096] S12, demoulding, the metal rod baked three times is taken out from the heating cavity by the Y-axis servo motor of the first robot arm and the servo motor of the clamping robot arm, and then the Y-axis and the clamping robot arm are controlled by the X-axis servo motor to move to the material rack in the first rack to be cooled, and then the metal rod after the plastic dipping is taken off the metal rod hanging plate for demoulding.

[0097] S13, product export, complete the intubation product export through a series of manual operations.

[0098] The number of times of dipping and baking the metal rod is not limited to three times, and the parameters can also be adjusted according to different models of products for production.

[0099] The plastic dipping and baking processing of the metal rod can be realized not only by the large cycle of the second robot arm and the first robot arm, but also by the second robot arm or the first robot arm alone.

[0100] During the plastic dipping and baking process of the above-mentioned metal rods, the X-axis servo motor, the Y-axis servo motor and the servo motor of the clamping robot arm are linked to each other, and the rack and pinion transmission of each axis is strictly controlled to achieve precise displacement.

[0101] The embodiments described in the drawings of the present invention are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

Claims

1. An automatic plastic dipping production line for metal rods. Features: include: The first frame, the second frame, the first mechanical arm, the second mechanical arm, the first plastic dipping device, the second plastic dipping device, the first heating device, the second heating device, the rotary dripping device, the circulation device, the feeding device, the vacuum degassing machine, the feeding mechanism and the exhaust system are installed in the glass sealed room, and the outside of the glass sealed room is respectively provided with an electric control box for controlling the operation of the first frame and the second frame; The first frame and the second frame have the same structure and are symmetrically arranged in a glass sealed room. A rotating dripping device is provided in the middle of the first frame and the second frame. The first mechanical arm and the second mechanical arm have the same structure; The first frame is further provided with a first plastic dipping device and a first heating device, and the second frame is further provided with a second plastic dipping device and a second heating device, the first plastic dipping device and the second plastic dipping device have the same structure, and the first heating device and the second heating device have the same structure; The first plastic dipping device is externally connected to a circulation device, and the first plastic dipping device and the second plastic dipping device are respectively connected to a feeding device at their lower parts; The vacuum degassing machine is arranged outside the glass sealed room.

2. The metal rod automatic plastic dipping production line according to claim 1, Features: The second mechanical arm installed on the second frame includes an X-axis formed by two mutually parallel beams of the frame, a Y-axis dynamically connected to the two X-axis in the horizontal direction at 90°, and a clamping mechanical arm dynamically connected to the Y-axis in the vertical direction, the axial inner sides of the two X-axis are respectively fixed with an X-axis rack, an X-axis guide rail and an X-axis slider matched with the X-axis guide rail, and both ends of the Y-axis are equipped with an X-axis servo motor and an X-axis gear, the X-axis servo motor is connected to the X-axis gear, and the X-axis gear is meshed with the X-axis rack; A Y-axis rack and a Y-axis guide rail are installed in the axial direction of the Y-axis, and the clamping robot arm is equipped with a Y-axis servo motor, a Y-axis slider and a Y-axis gear that cooperate with the Y-axis guide rail. The Y-axis servo motor is connected with the Y-axis gear, and the Y-axis gear is meshed with the Y-axis rack; a clamping robot arm rack, a clamping robot arm guide rail, a clamping robot arm slider, a clamping robot arm servo motor and a clamping robot arm gear are installed on one side of the clamping robot arm, and a cylinder and a pneumatic clamp for clamping a metal rod tray are provided at the lower end of the clamping robot arm.

3. The metal rod automatic plastic dipping production line according to claim 1, Features: The first plastic dipping device and the second plastic dipping device are located on both sides of the rotating dripping device. The first plastic dipping device includes a plastic dipping box, a heating belt, a feed port, a discharge port, a plastic dipping box tray and a weight sensing mechanism. The plastic dipping box is embedded in the weight sensing mechanism, and a temperature sensor is provided on the outer side of the weight sensing mechanism. The heating belt is evenly wound around the outer wall of the plastic dipping box. A feed port is provided on the upper side of the plastic dipping box body, and a discharge port is provided on the lower side of the plastic dipping box body. A plastic dipping box tray is installed at the bottom of the plastic dipping box.

4. The metal rod automatic plastic dipping production line according to claim 1, Features: The rotary dripping device includes a rotating table, a rack, a rotating motor and a waste liquid storage box. The rotating table is provided with four racks arranged at 90 degrees to each other. The rotating motor is connected to the rotating table, and the waste liquid storage box is connected to the bottom of each rack. Waste liquid discharge outlets are formed on the rotating table at the positions corresponding to the four racks.

5. The metal rod automatic plastic dipping production line according to claim 1, Features: The first heating device is adjacent to the first plastic dipping device, and the second heating device is adjacent to the second plastic dipping device. Each of the heating devices includes a heating cavity, a heating tube, a central heating column, a heating cavity upper cover, a heating cavity upper cover opening mechanism and an exhaust duct. The heating tubes are distributed at equal angles in the circular heating cavity, the central heating column is arranged in the center of the heating cavity, the heating cavity upper cover opening mechanism is located on one side of the heating cavity, and the exhaust duct is directly connected to the exhaust system.

6. The metal rod automatic plastic dipping production line according to claim 1, Features: The circulation device comprises a circulation pneumatic diaphragm pump and a circulation pipeline, and both ends of the circulation pipeline are respectively connected to the dipping box of the first dipping device.

7. The metal rod automatic plastic dipping production line according to claim 1, Features: The feeding device comprises a plastic dipping liquid storage tank, a feeding pipeline and a feeding pneumatic diaphragm pump. The feeding pipeline is respectively connected to the first plastic dipping device, the second plastic dipping device and the plastic dipping liquid storage tank, and a feeding pneumatic diaphragm pump is installed on the feeding pipeline.

8. The metal rod automatic plastic dipping production line according to claim 1, Features: The feeding mechanism comprises a feeding rack and a metal rod hanging plate placed on the feeding rack, and the metal rod hanging plate is provided with a plurality of insertion holes.

9. A processing technology for an automated plastic dipping production line for metal rods. Features: The process includes the following steps: setting of dipping process parameters, preheating, loading in the second rack, dipping the metal rod once, baking the metal rod once, manually setting the spring reinforcing liner, dipping the metal rod twice, dripping, baking the metal rod twice, dipping the metal rod three times, baking three times, demoulding and product exporting; S1. Setting of dipping process parameters. First, set the parameters, including: the negative pressure of the vacuum degassing machine is between 80-100Mpa, the dipping speed and the discharging speed are maintained at 10-30mm / s, the dipping holding time is generally 10-20s, the baking time is within 3min-8min, and the static time of the dripping process is 5-30min; then select the corresponding program, and the PLC executes the program to control the movement of each device in the production line; S2, preheating, preheating the first heating device, the second heating device and the second dipping device, so that the preheating temperature of the first heating device and the second heating device is maintained between 150°C and 230°C, and the temperature of the dipping liquid in the second dipping device is maintained at 45±5°C; S3, loading the material in the second rack, the operator first removes the metal rod hanging plate from the material rack in the second rack, inserts the metal rods to be impregnated into the insertion holes of the metal rod hanging plate in sequence, passes the heads of the metal rods through the metal rod hanging plate and fixes the metal rods to the metal rod hanging plate, and then places the metal rod hanging plate on the material rack; S4, the metal rod is dipped once. First, the X-axis servo motor of the second robot arm drives the Y-axis and the clamping robot arm to produce horizontal displacement relative to the X-axis. The Y-axis servo motor is used to adjust the clamping robot arm to the top of the material rack. The servo motor of the clamping robot arm is started to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod through the hanging plate. Then, the X-axis servo motor controls the Y-axis and the clamping robot arm to move horizontally to the top of the second dipping device. The servo motor of the clamping robot arm controls the clamping robot arm to move downward and immerse it in the dipping box of the second dipping device to complete the dipping operation of the metal rod. The dipping time of the metal rod is generally 10-20s, and the dipping speed and the discharging speed are maintained at 10-30mm / s. S5, baking the metal rod after the first plastic dipping, start the heating cavity cover cylinder of the heating cavity cover opening mechanism to open the heating cavity cover, control the Y axis and the clamping robot arm through the X axis servo motor to move the metal rod after the first plastic dipping to the top of the heating cavity of the second heating device, and then control the clamping robot arm servo motor to move the clamping robot arm downward into the heating cavity of the second heating device to bake the metal rod after the plastic dipping, the baking temperature is set in the range of 150°C-230°C according to different models of products, and the baking time is maintained within 3min-8min; S6, manually set the spring reinforcing lining, set the spring reinforcing lining on the metal rod after the first baking, control the clamping robot arm upward through the servo motor of the clamping robot arm, take out the metal rod that is basically shaped after baking from the heating chamber of the second heating device, and then control the Y axis and the clamping robot arm through the X axis servo motor to place the metal rod tray on the material rack, and after cooling for 15-30 minutes, remove the metal rod from the insert plate, and complete the spring setting operation through manual operation; S7, secondary plastic dipping of metal rods, insert the metal rods with spring reinforcement lining into the insertion holes of the metal rod hanging plate in sequence, make the head of the metal rod pass through the metal rod hanging plate and fix the metal rod to the metal rod hanging plate, then place the metal rod hanging plate on the material rack, drive the Y axis and the clamping robot arm to produce horizontal displacement relative to the X axis through the X axis servo motor of the second robot arm, adjust the clamping robot arm to the top of the material rack through the Y axis servo motor, start the clamping robot arm servo motor to drive the pneumatic clamp on the clamping robot arm to move downward and clamp the metal rod hanging plate, then control the Y axis and the clamping robot arm to translate to the top of the second plastic dipping device through the X axis servo motor, control the clamping robot arm servo motor to move downward and immerse it in the plastic dipping box of the second plastic dipping device to complete the secondary plastic dipping operation of the metal rod, the metal rod plastic dipping holding time is generally 10-20s, and the plastic dipping speed and the material discharging speed are maintained at 10-30mm / s; S8, the dripping of the metal rod after the secondary dipping is carried out by controlling the Y-axis and the clamping robot arm of the X-axis servo motor of the second robot arm to move to the rack of the rotating dripping device for dripping. The static time of the dripping process is 5-30 minutes. After the static time is completed, the rotating motor is controlled to rotate 180 degrees, so that the metal rod on the rack passes through the hanging plate and moves to the right side of the first heating device; S9, baking the metal rod after secondary dipping, start the heating cavity cover cylinder of the heating cavity cover opening mechanism of the first heating device to open the heating cavity cover, and control the Y axis and the clamping robot arm through the X axis servo motor of the first robot arm to move the metal rod after dipping from the rotating dripping device to the top of the heating cavity of the first heating device, and then control the clamping robot arm through the servo motor of the clamping robot arm to move downward into the heating cavity of the first heating device to bake the metal rod after dipping. The baking temperature is set in the range of 150°C-230°C according to different models of products, and the baking time is maintained within 3min-8min; S10, three times of dipping the metal rod, the X-axis servo motor of the first robot arm controls the Y-axis and the clamping robot arm to move the metal rod after the second baking from the heating chamber of the first heating device to the top of the first dipping box, and then the servo motor of the clamping robot arm controls the clamping robot arm to move downward into the first dipping box to complete the three times of dipping; S11, baking the metal rod after the third dipping, the operation is the same as the second baking procedure of the metal rod; S12, demoulding, the metal rod baked three times is taken out from the heating chamber by the Y-axis servo motor of the first robot arm and the servo motor of the clamping robot arm, and then the Y-axis and the clamping robot arm are moved to the material rack in the first rack by the X-axis servo motor to be cooled, and the metal rod after the plastic dipping is taken out from the metal rod hanging plate for demoulding; S13, product export, complete the intubation product export through a series of manual operations.

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