PCB rapid drying device with automatic feeding function

Abstract

The invention discloses an automatic feeding PCB rapid drying device which is characterized in that a drying box is installed above a conveying belt, a preheating box is arranged at the left end of the drying box, an air outlet cover is installed on the upper half portion of the front side in the preheating box, and a graphite heat storage unit is installed on the lower portion in the air outlet cover; a lifting frame is installed in the preheating box in an up-down lifting mode, a clip is placed on the lifting frame, the front side and the rear side of the left end of the lifting frame are each provided with a lifting frame, opening and closing mechanisms are symmetrically installed on the front side and the rear side of the left end of the lower portion of the preheating box and connected with the lifting frames, and two door plates are slidably installed at the left end of the preheating box. The preheating box is arranged at the inlet of the drying device, the device for feeding the pcb is arranged in the preheating box, the air outlet cover is integrated in the preheating box, and the air outlet cover is used for being connected with the drying device, so that waste heat in the drying device can preheat the pcb fed in the preheating box, and the subsequent drying time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board processing, and in particular to a rapid drying device for PCB boards with automatic feeding. Background Art

[0002] During the cleaning, drilling or wet process of a PCB board, moisture, solvents or chemical substances will remain on its surface. To prevent the board from delaminating, blistering or having poor solder joints due to water evaporation during subsequent high-temperature processes (such as reflow soldering), the PCB board needs to be dried afterwards. Currently, when performing the drying process, the commonly used method is to adopt a tunnel drying device, that is, a drying device is integrated above a conveyor belt, and the PCB board is placed on the conveyor belt and conveyed into the drying box for drying. An upper feeding device is also provided at the entrance of the conveyor belt. The existing upper feeding device generally includes a lifter for lifting a magazine containing PCB boards, and a pushing mechanism arranged on the lifter. After the lifter positions the PCB board in the magazine above the conveyor belt, the pushing mechanism pushes the PCB board onto the conveyor belt. Then the magazine rises again under the action of the lifter, and the pushing mechanism pushes the material again, and so on to achieve automatic feeding. The lifter is generally directly exposed outside and only serves for feeding, while the waste heat after drying in the drying device is generally directly discharged, resulting in waste of resources and a relatively long drying time required. For this reason, we have designed a rapid drying device for PCB boards with automatic feeding. Summary of the Invention

[0003] A rapid drying device for PCB boards with automatic feeding proposed by the present invention solves the above problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A rapid drying device for PCB boards with automatic feeding includes a conveyor belt, above which a drying box is installed. A preheating box is provided at the left end of the drying box. A pushing structure is installed on the left side of the preheating box. In the upper half of the front side inside the preheating box, an air outlet hood is installed. Below the air outlet hood, a graphite heat storage unit is installed. A plurality of evenly distributed air outlets are opened at the lower rear of the air outlet hood. A blocking member is slidably installed at the air outlets. Driving members and reset members are respectively installed at the left and right ends of the blocking member. A lifting frame is installed in the preheating box in a vertically movable manner. A magazine is placed on the lifting frame. At the front and rear sides of the left end of the lifting frame, a lifting bracket is provided on each side. The driving member is slidably connected to the front lifting bracket. At the front and rear sides of the left end below the preheating box, opening and closing mechanisms are symmetrically installed. The opening and closing mechanisms are connected to the lifting brackets, and two door panels are slidably installed at the left end of the preheating box. The two door panels are respectively connected to the two opening and closing mechanisms.

[0005] Preferably, an air inlet pipe is installed at the rear side of the drying box. The air inlet pipe is connected to an external hot air blower through a pipeline. An air outlet pipe is installed at the front end of the drying box. A shunt pipe is connected to the air outlet pipe. The other end of the shunt pipe is connected to the top end of the air outlet hood. An air draft pipe is installed at the rear side of the preheating box. The other end of the air draft pipe is connected to an air draft fan. The hot air flow generated by the hot air blower can enter the interior of the drying box through the air inlet pipe, thereby drying the pcb board inside the drying box.

[0006] Preferably, a material opening is provided on each of the left and right sides of the preheating box. The bottom ends of the two material openings are flush with the upper surface of the conveyor belt. The pushing structure includes a cylinder installed at the left end of the preheating box through a bracket. A pushing plate is connected to the push rod of the cylinder. The pushing plate is located inside the left material opening. The length and height of the material opening are greater than the length and thickness of the pcb board.

[0007] Preferably, the blocking member includes a blocking frame that slides left and right and fits against the lower rear inside of the air outlet hood. A linear chute is provided above the blocking frame. Two guide pins are slidably arranged in the linear chute. The rear ends of the two guide pins are fixed to the inner wall of the air outlet hood. A plurality of uniformly distributed baffle plates are integrally formed below the blocking frame. The width of the baffle plate is greater than the width of the air outlet, and the number of both is the same. In the initial state, that is, when the upper position inside the magazine is still below the material opening, at this time, the baffle plate is entirely on the left under the action of the reset member. The baffle plate and the air outlet are designed to overlap, that is, the baffle plate blocks the air outlet, so that the internal hot air flow cannot be discharged outward.

[0008] Preferably, the reset member includes a rear side frame fixed to the right side of the air outlet hood. A reset rod is slidably inserted left and right inside the rear side frame. The left end of the reset rod passes through the air outlet hood and extends into its interior, and the left end of the reset rod is fixed to the right end of the blocking frame. A contact ring is fixedly sleeved on the part of the reset rod between the rear side frame and the air outlet hood. A reset spring is sleeved on the reset rod. The two ends of the reset spring are respectively in contact with the contact ring and the rear side frame. The reset spring makes the contact ring and the reset rod always tend to move to the left, so that the blocking member always tends to move to the left, enabling it to block the air outlet as needed.

[0009] Preferably, the driving member includes a push rod fixed to the left end of the blocking frame. The left end of the push rod passes through the air outlet cover and is located outside it. A connecting block is fixed to the left end of the push rod. A plugging rod is slidably inserted into the connecting block in the front-back direction. A butting rod is fixed to the left side of the front end of the plugging rod. A fixing plate is fixed to the left end outside the air outlet cover. A strip-shaped opening with a strip-shaped structure is formed in the fixing plate. The rear end of the plugging rod slides through the strip-shaped opening and is located on the rear side thereof. A circular ring is sleeved and fixed on the part of the plugging rod between the fixing plate and the connecting block. A butting spring is sleeved on the plugging rod. The front and rear ends of the butting spring are respectively abutted against the fixing plate and the circular ring. The plugging rod can slide left and right in the strip-shaped opening, thereby driving the connecting block and the push rod to move left and right. The butting spring makes the plugging rod and the circular ring always have a tendency to move forward.

[0010] Preferably, rectangular notch openings are provided on both the front and rear sides of the lifting frame. The front and rear ends of the magazine are aligned with the rectangular notch openings. A plurality of uniformly distributed air vents are provided on both the front and rear sides of the magazine. The hot air flow can directly pass through the rectangular notch openings and the air vents to cross the entire interior of the magazine, thereby pre-drying the PCB board in the magazine. An opening is formed through the upper and lower parts of the lifting frame on the side close to the air outlet cover. The air outlet cover is directly above the opening. The length and width of the opening are greater than the length and width of the outside of the air outlet cover. The lifting frame will not collide with the air outlet cover when moving up and down. And when the lifting frame is at the lowest position, the air outlet cover is above the lifting frame at this time (the distance is the thickness of N PCB boards); Lifting lead screws are rotatably installed on both the front and rear sides inside the preheating box through bearings. The lifting frame is connected to the lifting lead screws through lifting nuts. The two lifting lead screws are connected through a toothed belt and toothed belt pulleys. And guide rods are respectively provided at the four corners of the preheating box. The guide rods are slidably connected to the lifting frame. The bottom end of one of the lifting lead screws is connected to a servo motor. The servo motor can make the two lifting lead screws rotate synchronously, thereby making the lifting frame move up and down.

[0011] Preferably, a driving groove is formed on the right surface of the lifting frame on the side close to the air outlet cover. The driving groove includes a rising groove and a falling groove. The top ends of the rising groove and the falling groove are connected through a horizontal groove. The bottom end of the rising groove is below the bottom end of the falling groove. And the bottom ends of the rising groove and the falling groove are connected through a connecting inclined groove. A thickened plate is provided in the rising groove. A moving inclined surface is formed by cutting off a part of the top end of the thickened plate. The bottom end of the thickened plate has an inclined surface design, and the slope is the same as that of the connecting inclined groove. The depths of the rising groove, the falling groove, the horizontal groove and the connecting inclined groove are the same. A part of the bottom end of the butting rod is cut off to form an inclined surface, and the slope of this inclined surface is the same as that of the moving inclined surface; When the lifting frame is at the lowest position, the abutting rod is at the top of the rising slot. When the lifting frame is at the highest position, that is, when the pcb at the bottom end inside the magazine is flush with the material port, the abutting rod will slide off the thickened plate and fall to the bottom of the rising slot. When the lifting frame and the lifting bracket are at the lowest position, the abutting rod is at the top of the descending slot. At this time, the abutting rod and the inserting rod will move forward under the action of the abutting spring, so that the abutting rod is at the top of the rising slot.

[0012] Preferably, the opening and closing mechanism includes a mounting screw sleeve rotatably installed at the bottom end of the preheating box through a bearing. A driving rod is connected inside the mounting screw sleeve. The lower half of the driving rod is provided with a double-threaded section, which is threadedly connected to the mounting screw sleeve. The upper half of it is designed smoothly to form a straight rod section. A lifting chute is formed through the straight rod section from left to right. A sliding connecting rod is slidably arranged up and down in the lifting chute, and the sliding connecting rod is fixed to the lower part of the lifting frame. A jacking spring column is also fixed to the bottom end of the preheating box. The lifting rod of the jacking spring column is fixed to the straight rod section through a bracket. The jacking spring column includes a fixed sleeve fixed to the bottom end of the preheating box. A lifting rod is slidably inserted up and down inside the fixed sleeve. A jacking spring is abutted between the bottom end of the lifting rod and the bottom end of the fixed sleeve. The inner cavity of the fixed sleeve and the cross section of the lifting rod are in a convex structure, which can limit the maximum rising height of the lifting rod. The jacking spring makes the lifting rod have a tendency to move upward.

[0013] Preferably, an L-shaped track is provided on both the upper and lower sides of the left end of the preheating box. The door panel is slidably placed between the two tracks, and a plurality of uniformly distributed driving tooth grooves are arranged on the inner side end of the door panel. A driving gear is installed on the outer surface of the mounting screw sleeve, and the driving gear meshes with the driving tooth grooves.

[0014] The beneficial effects of the present invention: 1. By providing a preheating box at the entrance of the drying device, placing the device for feeding the pcb board inside the preheating box, and integrating an air outlet hood inside the preheating box, the air outlet hood is used to connect with the drying device, so that the waste heat in the drying device can preheat the pcb board fed inside the preheating box, reducing the subsequent drying time. 2. By providing a blocking member, when the blocking member is opened and the internal hot air flow is used for baking and preheating, during the blanking and replacement process of the empty magazine, the blocking member can block the air outlet hood, so that the internal hot air flow cannot overflow. Cooperating with the graphite heat storage unit arranged inside the air outlet hood, heat can be stored, and during the subsequent preheating process, through the preheating effect, the energy consumption is reduced at the same time. 3. By arranging two door panels below the preheating box and connecting the door panels to the device for feeding the PCB board, when the door panels are opened, the blocking member must be in a blocking state. When the door panels are closed and the device for feeding the PCB board is feeding, the blocking member is opened and preheated, avoiding heat loss inside due to accidental opening or forgetting to close the door panels. Description of the Drawings

[0015] Figure 1 It is a front view sectional schematic diagram of a fast drying device for automatically feeding PCB boards proposed by the present invention; Figure 2 is Figure 1 the isometric view of the left and right equal-angle axes; Figure 3 is Figure 1 the internal structure schematic diagram of the preheating box in Figure 4 is Figure 3 the structure schematic diagram of the air outlet hood, the magazine, and the lifting frame in Figure 5 is Figure 4 the structure schematic diagram of the lifting frame, the opening and closing mechanism, and the blocking member in Figure 6 is Figure 5 the structure schematic diagram of the blocking member, the reset member, the driving member, and the lifting frame in Figure 7 It is the structure schematic diagram of the misaligned opening of the air outlet in the air outlet hood and the blocking member; Figure 8 It is the structure schematic diagram of the lifting frame; Figure 9 is Figure 4 the structure schematic diagram of the door panel and the opening and closing mechanism in Figure 10 is Figure 9 the enlarged schematic diagram at A in Figure 11 is Figure 9 the enlarged view of the opening and closing mechanism in

[0016] Reference numerals in the figure: 1, drying oven; 11, air inlet pipe; 12, air outlet pipe; 13, shunt pipe; 14, conveyor belt; 2, preheating oven; 21, material inlet; 22, air guiding pipe; 3, air outlet hood; 301, air outlet; 31, graphite heat storage unit; 32, blocking member; 321, blocking frame; 322, blocking plate; 323, linear sliding groove; 33, reset member; 331, rear side frame; 332, reset rod; 333, reset spring; 334, abutting ring; 34, driving member; 341, connecting block; 342, pushing rod; 343, fixing plate; 344, inserting rod; 345, abutting spring; 346, abutting rod; 4, cylinder; 41, pushing plate; 5, magazine; 6, lifting frame; 601, opening; 602, rectangular notch; 61, lifting lead screw; 62, guiding rod; 63, lifting frame; 64, driving groove; 641, descending groove; 642, ascending groove; 643, thickened plate; 644, moving inclined surface; 645, connecting inclined groove; 7, door panel; 71, driving tooth groove; 72, opening and closing mechanism; 721, mounting screw sleeve; 722, driving rod; 723, jacking spring column; 724, driving gear; 725, lifting sliding groove; 726, sliding connecting rod. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Refer to Figure 1 - Figure 10 , a rapid drying device for PCB boards with automatic feeding, including a conveyor belt 14. Above the conveyor belt 14, a drying oven 1 is installed. At the left end of the drying oven 1, a preheating oven 2 is provided. A pushing structure is installed on the left side of the preheating oven 2. In the upper half of the front side inside the preheating oven 2, an air outlet hood 3 is installed. Below the air outlet hood 3, a graphite heat storage unit 31 is installed. A plurality of uniformly distributed air outlets 301 are opened at the lower rear of the air outlet hood 3. A blocking member 32 is slidably installed at the air outlet 301. Driving members 34 and reset members 33 are respectively installed at the left and right ends of the blocking member 32. A lifting frame 6 is installed in the preheating oven 2 in a vertically lifting manner. A magazine 5 is placed on the lifting frame 6. At the front and rear sides of the left end of the lifting frame 6, a lifting frame 63 is provided on each side. The driving member 34 is slidably connected to the front lifting frame 63. At the front and rear sides of the left end below the preheating oven 2, opening and closing mechanisms 72 are symmetrically installed. The opening and closing mechanisms 72 are connected to the lifting frame 63. And two door panels 7 are slidably installed at the left end of the preheating oven 2. The two door panels 7 are respectively connected to the two opening and closing mechanisms 72.

[0019] Refer to Figure 1 、 Figure 2, an air inlet pipe 11 is installed at the rear side of the drying box 1. The air inlet pipe 11 is connected to an external hot air blower through a pipeline. An air outlet pipe 12 is installed at the front end of the drying box 1. A shunt pipe 13 is connected to the air outlet pipe 12. The other end of the shunt pipe 13 is connected to the top end of the air outlet hood 3. An air guiding pipe 22 is installed at the rear side of the preheating box 2. The other end of the air guiding pipe 22 is connected to an air suction fan; The hot air flow generated by the hot air blower can enter the interior of the drying box 1 through the air inlet pipe 11, so as to dry the pcb board in the drying box 1. After that, the air flow will be discharged through the air outlet pipe 12. The discharged air flow still has a certain amount of residual heat. These air flows will enter the air outlet hood 3 through the shunt pipe 13 and flow in the preheating box 2 through the air outlet 301 on the air outlet hood 3, and preheat the pcb board in the magazine 5, reducing the drying time after it enters the interior of the drying box 1. After that, these air flows are discharged through the air guiding pipe 22 and the air suction fan.

[0020] Refer to Figure 1 , a material inlet 21 is opened on each of the left and right sides of the preheating box 2. The bottom ends of the two material inlets 21 are flush with the upper surface of the conveyor belt 14. The pushing structure includes a cylinder 4 installed at the left end of the preheating box 2 through a bracket. A push plate 41 is connected to the push rod of the cylinder 4. The push plate 41 is located in the left material inlet 21. The length and height of the material inlet 21 are greater than the length and thickness of the pcb board; The magazine 5 can move up and down together with the lifting frame 6 in the preheating box 2. After the magazine 5 containing the pcb board is placed inside the lifting frame 6, the pcb board will rise under the action of the lifting frame 6, so that the bottom end of the uppermost pcb board inside the magazine 5 is flush with the upper surface of the conveyor belt 14 and the bottom end of the material inlet 21. Then the push rod of the cylinder 4 extends to make the push plate 41 move leftward. The push plate 41 will make the pcb board be pushed out through the right material inlet 21 and move onto the conveyor belt 14. Then the push rod of the cylinder 4 contracts to drive the push plate 41 to reset. The lifting frame 6 makes the magazine 5 move up by the height of the thickness of one pcb board again. The push plate 41 is pushed out again under the action of the cylinder 4. This is repeated until all the pcb boards in the magazine 5 are discharged.

[0021] Refer to Figure 4 - Figure 7 , the blocking member 32 includes a blocking frame 321 that fits and slides left and right at the lower rear part inside the air outlet hood 3. A linear chute 323 is opened above the blocking frame 321. Two guide pins are slidably arranged in the linear chute 323. A ring is arranged at the front end of the guide pin. The ring is in sliding contact with the blocking frame 321. The rear ends of the two guide pins are fixed to the inner wall of the air outlet hood 3. A plurality of uniformly distributed blocking plates 322 are integrally formed below the blocking frame 321. The width of the blocking plates 322 is greater than the width of the air outlet, and the number of both is the same.

[0022] In the initial state, that is, when the upper position inside the clip 5 is still below the material port 21, the sealing plate 322 is moved to the left as a whole under the action of the reset member 33, and the sealing plate 322 and the air outlet are designed to overlap, that is, the sealing plate 322 blocks the air outlet, so that the internal hot air flow cannot be discharged outward; When the sealing plate 322 just starts to close, the airflow flows in a straight line in the blowing direction, forming a unidirectional motion path. Since the air outlet of the air outlet hood 3 is sealed at this time, the airflow cannot escape, causing internal pressure to accumulate in the air outlet hood 3. At this time, the pressure of the closed system gradually becomes uniform, energy is converted into internal energy, and the temperature rises. When the blowing point and the distal pressure tend to be balanced, the flow gradually weakens or even stagnates to reach a dynamic balance, which makes the temperature inside the air outlet hood 3 gradually increase, and the airflow cannot overflow, the temperature of the graphite heat storage unit 31 itself increases and stores heat. When the sealing plate 322 is opened again, the internal exhaust temperature is higher than the temperature just entering the air outlet hood 3, thereby improving the preheating effect.

[0023] Reference Figure 4 - Figure 7 The reset member 33 includes a rear side frame 331 fixed to the right side of the air outlet cover 3, and a reset rod 332 is inserted in the rear side frame 331 for sliding left and right movement. The left end of the reset rod 332 passes through the air outlet cover 3 and extends into the interior thereof, and the left end of the reset rod 332 is fixed to the right end of the blocking frame 321, and the reset rod 332 is located between the rear side frame 331 and the air outlet cover 3 and is fixedly sleeved with an abutment ring 334, and a reset spring 333 is sleeved on the reset rod 332, and the two ends of the reset spring 333 are respectively abutted against the abutment ring 334 and the rear side frame 331, and the reset spring 333 makes the abutment ring 334 and the reset rod 332 always have a tendency to move to the left, thereby making the blocking member 32 always have a tendency to move to the left, so that it can block the air outlet as needed.

[0024] Reference Figure 5 - Figure 7, the driving member 34 includes a push rod 342 fixed to the left end of the blocking frame 321. The left end of the push rod 342 passes through the air outlet hood 3 and is located outside it. A connecting block 341 is fixed to the left end of the push rod 342. A plug rod 344 is slidably inserted into the connecting block 341 in the front-back direction. A contact rod 346 is fixed to the left side of the front end of the plug rod 344. A fixing plate 343 is fixed to the left end outside the air outlet hood 3. A strip-shaped opening with a strip-shaped structure is formed in the fixing plate 343. The rear end of the plug rod 344 slides through the strip-shaped opening and is located at its rear side. A circular ring is fixedly sleeved on the part of the plug rod 344 between the fixing plate 343 and the connecting block 341. A contact spring 345 is sleeved on the plug rod 344. The front and rear ends of the contact spring 345 are respectively in contact with the fixing plate 343 and the circular ring. The plug rod 344 can slide left and right in the strip-shaped opening, thereby driving the connecting block 341 and the push rod 342 to move left and right. The contact spring 345 makes the plug rod 344 and the circular ring always have a tendency to move forward.

[0025] Refer to Figure 3 - Figure 5 , rectangular notches 602 are provided on both the front and rear sides of the lifting frame 6. The front and rear ends of the magazine 5 are aligned with the rectangular notches 602. A plurality of uniformly distributed air vents are provided on both the front and rear sides of the magazine 5. The hot air flow can directly pass through the rectangular notches 602 and the air vents and cross the entire interior of the magazine 5, thereby pre-drying the pcb board in the magazine 5. An opening 601 is formed by penetrating the lifting frame 6 in the up-down direction on the side close to the air outlet hood 3. The air outlet hood 3 is directly above the opening 601. The length and width of the opening 601 are greater than the length and width of the outside of the air outlet hood 3. The lifting frame 6 will not collide with the air outlet hood 3 when moving up and down. And when the lifting frame 6 is at the lowest position, at this time the air outlet hood 3 is above the lifting frame 6, and the distance is the thickness of N pcb boards; Lifting lead screws 61 are rotatably installed on both the front and rear sides inside the preheating box 2 through bearings. The lifting frame 6 is connected to the lifting lead screws 61 through lifting nuts. A toothed belt wheel is installed at the bottom end of each of the two lifting lead screws 61. The two toothed belt wheels are meshed and driven by a toothed belt. And a guide rod 62 is provided at each of the four corners of the preheating box 2. The guide rod 62 is slidably connected to the lifting frame 6. The bottom end of one of the lifting lead screws 61 is connected to a servo motor. The servo motor can make the two lifting lead screws 61 rotate synchronously, thereby making the lifting frame 6 move up and down.

[0026] Refer to Figure 5 - Figure 9, on the right surface of the lifting frame 63 close to one side of the air outlet cover 3, a driving groove 64 is formed. The driving groove 64 includes a rising groove 642 and a falling groove 641. The rising groove 642 and the top of the falling groove 641 are connected through a horizontal groove. The bottom end of the rising groove 642 is below the bottom end of the falling groove 641, and the bottom ends of the rising groove 642 and the falling groove 641 are connected through a connecting inclined groove 645. A thickened plate 643 is arranged in the rising groove 642. A moving inclined surface 644 is formed by cutting off a part of the top end of the thickened plate 643. The bottom end of the thickened plate 643 is designed with an inclined surface, and the slope is the same as that of the connecting inclined groove 645. Among them, the depths of the rising groove 642, the falling groove 641, the horizontal groove and the connecting inclined groove 645 are the same. The bottom end of the abutting rod 346 is cut off to form an inclined surface, and the slope of this inclined surface is the same as that of the moving inclined surface 644; Both the abutting rod 346 and the thickened plate 643 are made of materials with low friction coefficients (such as polytetrafluoroethylene, ceramic coatings) or self-lubricating materials to reduce the stick-slip effect of the contact surface. And the friction surface is polished or a nano-coating (such as diamond-like carbon coating) is added to reduce the mechanical interlock caused by the micro-roughness, so as to reduce the noise generated by the contact friction between the two.

[0027] In the initial state, that is, when the lifting frame 6 is at the lowest position, at this time, the abutting rod 346 is at the top end of the rising groove 642. When the lifting frame 6 moves upward, the lifting frame 63 will also move upward together. After rising to a certain height, the abutting rod 346 will contact the moving inclined surface 644 and move along the moving inclined surface 644 onto the thickened plate 643. When the abutting rod 346 slides along the moving inclined surface 644 to the surface of the thickened plate 643, the depth of the abutting rod 346 in the driving groove 64 gradually decreases, and the abutting rod 346 moves to the right. When the abutting rod 346 moves to the right, it will drive the plugging rod 344, the connecting block 341 and the pushing rod 342 to move to the right together, so that the blocking member 32 as a whole moves to the right. When the abutting rod 346 contacts the surface of the thickened plate 643, at this time, the blocking member 32 moves to the right to the maximum position, and the entire air outlet is exposed, and the hot air flow in the air outlet cover 3 flows into the magazine 5 through it; When the abutting rod 346 contacts the surface of the thickened plate 643 and continues to slide along its surface, at this time, the overall thickness does not change, and the position of the abutting rod 346 does not change, which makes the blocking member 32 always in the open state. When the lifting frame 6 is at the highest position, that is, when the pcb at the bottom end of the magazine 5 is flush with the material port 21, at this time, the abutting rod 346 will slide off the thickened plate 643 and fall to the bottom of the rising groove 642. Since the depth of the rising groove 642 is greater than that of the thickened plate 643, at this time, the abutting rod 346 and the blocking member 32 will move to the left under the action of the resetting member 33, and the blocking plate 322 will block the air outlet again; After the lifting frame 6 and the lifting rack 63 rise to the maximum extent, the lifting frame 6 will move downward under the action of the lifting lead screw 61. Since the height of the thickened plate 643 protrudes from the bottom of the rising groove 642, the abutting rod 346 cannot return along the original path, and the bottom inclined surface of the thickened plate 643 is the same as the connecting inclined groove 645. At this time, the abutting rod 346 will enter the descending groove 641 along the connecting inclined groove 645, and at this time, the inserting rod 344 moves backward. Under the action of the guide pin, the sealing baffle 322 can only move left and right and cannot move forward and backward, and the connecting block 341 fixed to it cannot move forward and backward together. This enables the sealing baffle 322 to closely seal the air outlet 301. The abutting spring 345 is in a compressed state. When the lifting frame 6 drives the lifting rack 63 to move downward, the depths of the descending groove 641 and the rising groove 642 are the same, and the abutting rod 346 will not move left and right, ensuring that the sealing member 32 is in a sealed state. When the lifting frame 6 and the lifting rack 63 are at the lowest position, the abutting rod 346 is at the uppermost part of the descending groove 641. At this time, the abutting rod 346 and the inserting rod 344 will move forward under the action of the abutting spring 345, so that the abutting rod 346 is at the uppermost part of the rising groove 642, waiting for the next rise of the lifting frame 6; When the abutting rod 346 is above the thickened plate 643, the lower surface of the uppermost pcb board inside the magazine 5 at this time is flush with the bottom end of the air outlet 301 of the air outlet cover 3, and there is a certain distance between the top end of the magazine 5 and the material inlet 21 at this time. This distance is the thickness of N pcb boards. The distance from the bottom of the air outlet 301 of the air outlet cover to the material inlet 21 for feeding of each pcb board in the magazine 5 is the thickness of N pcb boards. That is, the drying time of each pcb board in the magazine 5 is the time used for the magazine 5 to rise by the height of N pcb boards. This makes the drying time of each pcb board located in the magazine 5 by the hot air flow the same, so that their drying degrees are not very different. Under the condition that the drying time in the drying oven 1 is the same, the drying degrees are the same.

[0028] Refer to Figure 3 、 Figure 5 、 Figure 9 and Figure 11 , the opening and closing mechanism 72 includes a mounting sleeve 721 rotatably mounted at the bottom end of the preheating box 2 through a bearing. A driving rod 722 is connected inside the mounting sleeve 721. The lower half of the driving rod 722 is provided with a double-threaded section, which is threadedly connected to the mounting sleeve 721. The upper half of it is designed to be smooth to form a straight rod section. A lifting chute 725 is formed through the straight rod section from left to right. A sliding connecting rod 726 is slidably arranged up and down in the lifting chute 725, and the sliding connecting rod 726 is fixed to the lower part of the lifting rack 63; At the bottom end of the preheating box 2, there is also a jacking spring column 723 fixed. The lifting rod of the jacking spring column 723 is fixed to the straight rod section through a bracket. The jacking spring column 723 includes a fixed sleeve fixed to the bottom end of the preheating box 2. A lifting rod is slidably inserted up and down in the fixed sleeve. A jacking spring is abutted between the bottom end of the lifting rod and the bottom end of the fixed sleeve. The inner cavity of the fixed sleeve and the cross-section of the lifting rod are of a convex structure, which can limit the maximum rising height of the lifting rod. When the lifting frame 6 is at the lowest position, at this time, the double-threaded section is completely received into the mounting nut 721, and the bottom end of the sliding connecting rod 726 is at the bottom end of the lifting chute 725. At this time, the bottom end of the lifting rod is at the lowest position of the fixed sleeve, and the jacking spring is in a compressed state; The jacking spring causes the lifting rod to have a tendency to move upward. When the lifting frame 63 moves upward, the jacking spring will move upward together with the lifting rod and the double-threaded section. Since the threads inside the double-threaded section and the mounting nut 721 are both double-threaded and their self-locking property is extremely poor, during the upward linear movement of the double-threaded section, the mounting thread will rotate until the lifting rod rises to the maximum extent. At this time, the abutting rod 346 starts to contact the moving inclined surface 644. And during the continuous upward movement of the lifting frame 63, the lifting rod rises to the maximum extent and will not continue to move upward. However, the sliding connecting rod 726 fixed to the lifting frame 63 will continue to move upward until the lifting frame 6 rises to the maximum height.

[0029] On the upper and lower sides of the left end of the preheating box 2, there is an L-shaped track provided on each side. The door panel 7 is slidably placed between the two tracks, and a plurality of uniformly distributed driving tooth grooves 71 are provided on the inner side end of the door panel 7. A driving gear 724 is mounted on the outer surface of the mounting nut 721. The driving gear 724 meshes with the driving tooth grooves 71. The rotation directions of the front and rear mounting nuts 721 are opposite. When the lifting frame 6 rises from the lowest position, the front mounting nut 721 will rotate clockwise under the action of the double-threaded section, and the rear mounting nut 721 rotates counterclockwise. At this time, the driving gear 724 will cause the door panel 7 to move linearly inward through the driving tooth grooves 71, thereby closing the two door panels 7. After the door panels 7 are closed, the lifting frame 6 continues to move upward. At this time, the blocking member 32 starts to be misaligned with the air outlet, so that hot air can enter.

[0030] Working principle: During actual use, in the initial state, the two door panels 7 are in the open state, the lifting frame 6 in the preheating box 2 is at the lowest position, and at this time, the lifting rack 63 is also at the lowest position, and the blocking member 32 coincides with the air outlet, so that a sealed structure is formed inside the air outlet hood 3, and the hot air flow can only enter and cannot escape. Since the air outlet of the air outlet hood 3 is sealed at this time and the air flow cannot escape, the internal pressure accumulates in the air outlet hood 3. At this time, the pressure of the closed system gradually equalizes, and the energy is converted into internal energy and the temperature rises. When the blowing point and the distal pressure tend to balance, the flow gradually weakens or even stops to reach a dynamic balance, which makes the temperature inside the air outlet hood 3 gradually rise, and the air flow cannot overflow. The temperature of the graphite heat storage unit 31 itself rises and stores heat.

[0031] After that, the magazine 5 containing the pcb board is placed into the lifting frame 6, and the servo motor will cause the two lifting lead screws 61 to rotate clockwise, so that the lifting frame 6 moves upward. When the lifting frame 6 moves upward, it will drive the lifting rack 63 to move upward together. When the lifting rack 63 moves upward, due to the jacking spring, the lifting rod has a tendency to move upward, and the jacking spring column 723 will move the lifting rod and the double-threaded section upward together. Since the threads inside the double-threaded section and the mounting nut 721 are both double-threaded and their self-locking property is extremely poor, during the upward linear movement of the double-threaded section, the front mounting nut 721 will rotate clockwise under the action of the double-threaded section, and the rear mounting nut 721 will rotate counterclockwise. At this time, the driving gear 724 will cause the door panel 7 to move linearly inward through the driving tooth groove 71. When the lifting rod rises to the maximum extent, the two door panels 7 are completely closed at this time. During the continuous upward movement of the lifting rack 63, after the lifting rod rises to the maximum extent, it will not continue to move upward, and the sliding link 726 fixed to the lifting rack 63 will continue to move upward along the lifting chute 725 until the lifting frame 6 rises to the maximum height; When the door panel 7 is completely closed, the abutting rod 346 and the moving inclined surface 644 start to contact. When the abutting rod 346 slides along the moving inclined surface 644 to the surface of the thickened plate 643, the depth of the abutting rod 346 in the driving groove 64 gradually decreases, and the abutting rod 346 will move to the right. When the abutting rod 346 moves to the right, it will drive the plugging rod 344, the connecting block 341 and the pushing rod 342 to move to the right together, so that the whole blocking member 32 moves to the right. When the abutting rod 346 contacts the surface of the thickened plate 643, at this time, the blocking member 32 moves to the left to the maximum position, and the entire air outlet is exposed, and the hot air flow in the air outlet hood 3 flows into the magazine 5 through it; When the abutting rod 346 is above the thickened plate 643, the lower surface of the uppermost PCB board inside the magazine 5 at this time is flush with the bottom end of the air outlet of the air outlet hood 3. The hot air flow can enter the magazine 5 and preheat the PCB board. Then, the lifting frame 6 continues to move upward under the action of the lifting lead screw 61 until the lower surface of the uppermost PCB board is flush with the lower surface of the material port 21. Then, the push rod of the air cylinder 4 extends, causing the push plate 41 to move leftward. The push plate 41 will push the PCB board out through the right-side material port 21 and move it onto the conveyor belt 14, and under the action of the conveyor belt 14, it will enter the drying box 1 for drying operations. After that, the push rod of the air cylinder 4 contracts to drive the push plate 41 to reset, and the lifting frame 6 raises the magazine 5 by the height of the thickness of one PCB board again. The push plate 41 is pushed out again under the action of the air cylinder 4, and so on until all the PCB boards in the magazine 5 are discharged; During this process, the abutting rod 346 contacts the surface of the thickened plate 643 and continues to slide along its surface. At this time, the overall thickness does not change, and the position of the abutting rod 346 does not change, which makes the blocking member 32 in an open state. When the lifting frame 6 is at the highest position, that is, when the PCB board at the bottom end inside the magazine 5 is flush with the material port 21, the abutting rod 346 will slide to the bottommost part of the rising groove 642 at this time. Since the depth of the rising groove 642 is greater than that of the thickened plate 643, the abutting rod 346 and the blocking member 32 will move leftward under the action of the reset member 33, and the blocking plate 322 will block the air outlet again.

[0032] After the lifting frame 6 and the lifting bracket 63 rise to the maximum extent and empty the PCB boards in the magazine 5, the lifting frame 6 will move downward under the action of the lifting lead screw 61. Since the height of the thickened plate 643 protrudes from the bottom of the rising groove 642, the abutting rod 346 cannot return along the original path. At this time, the abutting rod 346 will enter the descending groove 641 along the connecting inclined groove 645, and at this time, the inserting rod 344 moves backward, and the abutting spring 345 is in a compressed state. When the lifting frame 6 drives the lifting bracket 63 to move downward, the depths of the descending groove 641 and the rising groove 642 are the same, and it will not cause the abutting rod 346 to move left and right, ensuring that the blocking member 32 is in a blocking state. When the lifting frame 6 and the lifting bracket 63 are at the bottommost position, the abutting rod 346 is at the uppermost part of the descending groove 641. At this time, the abutting rod 346 and the inserting rod 344 will move forward under the action of the abutting spring 345, causing the abutting rod 346 to be at the uppermost part of the rising groove 642, waiting for the next rise of the lifting frame 6; During the downward movement of the lifting frame 6 and the lifting frame 63, the sliding link 726 fixed to the lifting frame 63 will slide downward along the lifting chute 725. When the sliding link 726 reaches the lowest end of the lifting chute 725, the blocking member 32 has already blocked the air outlet. When the sliding link 726 continues to move downward with the lifting frame 63 and the lifting frame 6, the sliding link 726 will push the driving rod 722 downward, causing the driving rod 722 to move downward. The downward moving driving rod 722 and the double-threaded section will cause the mounting sleeve 721 to rotate in the opposite direction when rising. At this time, the driving gear 724 will cause the door panel 7 to move linearly outward through the driving tooth groove 71, thereby opening the two door panels 7, and the empty magazine 5 can be taken out and replaced, waiting for the next feeding.

[0033] By providing a preheating box 2 at the inlet of the drying device, placing the device for feeding the pcb board in the preheating box 2, and integrating an air outlet hood 3 in the preheating box 2, the air outlet hood 3 is used to connect with the drying device, so that the waste heat in the drying device can preheat the pcb board fed in the preheating box 2, reducing the subsequent drying time; By providing a blocking member 32 and connecting the blocking member 32 to the device for feeding the pcb board, when the pcb board rises to a certain height for feeding, the blocking member 32 opens and the internal hot air flow is used for baking and preheating. During the feeding and replacement of the empty magazine 5, the blocking member 32 can block the air outlet hood 3, preventing the internal hot air flow from overflowing. With the graphite heat storage unit 31 provided in the air outlet hood 3, heat can be stored, and during the subsequent preheating process, through the preheating effect, energy consumption is reduced at the same time; By providing two door panels 7 below the preheating box 2 and connecting the door panels 7 to the device for feeding the pcb board, when the door panels 7 are opened, the blocking member 32 must be in a blocked state. When the door panels 7 are closed and the device for feeding the pcb board is feeding, the blocking member 32 opens and preheats, avoiding heat loss caused by the accidental opening or forgetting to close of the door panels 7.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0036] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A PCB board rapid drying device with automatic feeding, characterized in that: The invention comprises a conveyor belt (14), a drying box (1) is installed above the conveyor belt (14), a preheating box (2) is arranged at the left end of the drying box (1), a material pushing structure is installed on the left side of the preheating box (2), an air outlet hood (3) is installed at the front upper half of the interior of the preheating box (2), a graphite heat storage unit (31) is installed at the lower part of the interior of the air outlet hood (3), a plurality of evenly distributed air outlets are opened at the lower rear of the air outlet hood (3), a sealing member (32) is slidably installed at the air outlet, and a driving member (34) and a reset member are installed at the left and right ends of the sealing member (32), respectively. (33), a lifting frame (6) is installed in the preheating box (2) in an upward and downward lifting manner, a clip (5) is placed on the lifting frame (6), a lifting frame (63) is provided on both the front and rear sides of the left end of the lifting frame (6), the driving member (34) is slidably connected to the front lifting frame (63), an opening and closing mechanism (72) is symmetrically installed on the front and rear sides of the left end of the lower side of the preheating box (2), the opening and closing mechanism (72) is connected to the lifting frame (63), and two door panels (7) are slidably installed on the left end of the preheating box (2), and the two door panels (7) are respectively connected to the two opening and closing mechanisms (72).

2. The automatic loading PCB board rapid drying device according to claim 1 is characterized in that: An air inlet pipe (11) is installed at the rear side of the drying box (1), and the air inlet pipe (11) is connected to an external hot air blower through a pipeline. An air outlet pipe (12) is installed at the front end of the drying box (1), and a shunt pipe (13) is connected to the air outlet pipe (12), and the other end of the shunt pipe (13) is connected to the top of the air outlet cover (3). An induced draft pipe (22) is installed at the rear side of the preheating box (2), and the other end of the induced draft pipe (22) is connected to the induced draft fan.

3. The automatic loading PCB board fast drying device according to claim 1 is characterized in that: A material opening (21) is provided on both the left and right sides of the preheating box (2), the bottom ends of the two material openings (21) are flush with the upper surface of the conveyor belt (14), the material pushing structure comprises a cylinder (4) mounted on the left end of the preheating box (2) through a bracket, a material pushing plate (41) is connected to the push rod of the cylinder (4), and the material pushing plate (41) is located in the material opening (21) at the left end, and the length and height of the material opening (21) are greater than the length and thickness of the PCB board.

4. The automatic loading PCB board rapid drying device according to claim 1 is characterized in that: The sealing member (32) comprises a sealing frame (321) which is slidably fitted to the lower rear part of the air outlet cover (3) in the left and right directions; a linear slide groove (323) is provided above the sealing frame (321); two guide pins are slidably provided in the linear slide groove (323); the rear ends of the two guide pins are fixed to the inner wall of the air outlet cover (3); a plurality of evenly distributed sealing plates (322) are integrally formed below the sealing frame (321); the width of the sealing plates (322) is greater than the width of the air outlet, and the number of the two sealing plates is the same.

5. The automatic loading PCB board rapid drying device according to claim 4 is characterized in that: The reset member (33) comprises a rear side frame (331) fixed to the right side of the air outlet cover (3); a reset rod (332) is inserted into the rear side frame (331) so as to slide leftward and rightward; the left end of the reset rod (332) passes through the air outlet cover (3) and extends into the interior thereof; the left end of the reset rod (332) is fixed to the right end of the blocking frame (321); a contact ring (334) is fixedly sleeved on the portion of the reset rod (332) between the rear side frame (331) and the air outlet cover (3); a reset spring (333) is sleeved on the reset rod (332); and the two ends of the reset spring (333) are respectively in contact with the contact ring (334) and the rear side frame (331).

6. The automatic loading PCB board fast drying device according to claim 4 is characterized in that: The driving member (34) comprises a pushing rod (342) fixed to the left end of the blocking frame (321); the left end of the pushing rod (342) passes through the air outlet cover (3) and is placed outside the air outlet cover; a connecting block (341) is fixed to the left end of the pushing rod (342); a plug-in rod (344) is plugged in and slidably connected to the connecting block (341); an abutting rod (346) is fixed to the left side of the front end of the plug-in rod (344); and the left side of the outside of the air outlet cover (3) is fixed to the connecting rod (344). A fixing plate (343) is fixed at one end, the fixing plate (343) is provided with a strip opening of a long strip structure, the rear end of the plug rod (344) slides through the strip opening and is placed at the rear side thereof, the plug rod (344) is located at the fixing plate (343) and the connecting block (341) and is fixed with a circular ring, the plug rod (344) is sleeved with an abutment spring (345), and the front and rear ends of the abutment spring (345) are respectively abutted against the fixing plate (343) and the circular ring.

7. The automatic loading PCB board fast drying device according to claim 1 is characterized in that: The front and rear sides of the lifting frame (6) are both provided with rectangular notches (602), the front and rear ends of the clip (5) are aligned with the rectangular notches (602), and the front and rear sides of the clip (5) are both provided with a plurality of evenly distributed air vents, the lifting frame (6) is formed by penetrating the side close to the air outlet cover (3) from top to bottom to form an opening (601), the air outlet cover (3) is located directly above the opening (601), and the length and width of the opening (601) are greater than the length and width of the outside of the air outlet cover (3); Both front and rear sides of the preheating box (2) are rotatably mounted with lifting screws (61) via bearings; the lifting frame (6) is connected to the lifting screws (61) via a lifting screw seat; the two lifting screws (61) are connected via a toothed belt and a toothed belt wheel; and a guide rod (62) is respectively provided at each of the four corners of the preheating box (2); the guide rod (62) is slidably connected to the lifting frame (6).

8. The automatic loading PCB board rapid drying device according to claim 6 is characterized in that: A driving groove (64) is provided on the right side surface of the lifting frame (63) near the air outlet cover (3), and the driving groove (64) includes an ascending groove (642) and a descending groove (641). The top ends of the ascending groove (642) and the descending groove (641) are connected via a horizontal groove. The bottom end of the ascending groove (642) is below the bottom end of the descending groove (641), and the bottom ends of the ascending groove (642) and the descending groove (641) are connected via a connecting inclined groove (645). A thickened plate (643) is arranged in the rising groove (642), and a portion of the top of the thickened plate (643) is cut away to form a movable inclined surface (644). The bottom end inclined surface of the thickened plate (643) is designed, and the slope is the same as that of the connecting inclined groove (645), wherein the rising groove (642), the descending groove (641), the horizontal groove and the connecting inclined groove (645) have the same depth, and a portion of the bottom end of the abutting rod (346) is cut away to form an inclined surface, and the slope of the inclined surface is the same as that of the movable inclined surface (644).

9. The automatic loading PCB board rapid drying device according to claim 1, characterized in that: The opening and closing mechanism (72) comprises a mounting screw sleeve (721) rotatably mounted at the bottom end of the preheating box (2) via a bearing, a driving rod (722) being connected inside the mounting screw sleeve (721), a bidirectional threaded section being provided at the lower half of the driving rod (722), the bidirectional threaded section being threadedly connected to the mounting screw sleeve (721), and a straight rod section being smoothly designed at the upper half thereof, a lifting slot (725) being formed by the straight rod section being penetrated from left to right, a sliding connecting rod (726) being provided in the lifting slot (725) so as to slide up and down, and the sliding connecting rod (726) being fixed to the lower side of the lifting frame (63); A lifting spring column (723) is also fixed to the bottom end of the preheating box (2), and a lifting rod of the lifting spring column (723) is fixed to the straight rod section via a bracket. The lifting spring column (723) comprises a fixing sleeve fixed to the bottom end of the preheating box (2), a lifting rod is inserted in the fixing sleeve so as to slide up and down, and a lifting spring is abutted between the bottom end of the lifting rod and the bottom end of the fixing sleeve.

10. The automatic loading PCB board rapid drying device according to claim 9, characterized in that: An L-shaped track is provided on both upper and lower sides of the left end of the preheating box (2); the door panel (7) is slidably placed between the two tracks; and a plurality of evenly distributed drive tooth grooves (71) are provided on the inner side of the door panel (7); a drive gear (724) is installed on the outer ring surface of the mounting screw sleeve (721); and the drive gear (724) is meshed with the drive tooth groove (71).

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