A 3D printing device with uniform cooling structure

Abstract

The present invention relates to the field of 3D printing technology, and in particular to a 3D printing device with a uniform cooling structure. It comprises a base, the base is fixedly connected to a control terminal, the base is fixedly connected to a loading rack, the base is provided with a driving unit, the driving unit is provided with a mobile rack, the mobile rack is provided with a limiting cover, a sleeve is fixedly connected between the feeding shell and the limiting cover, the limiting cover is provided with a throat, the mobile rack is provided with a heating unit, the mobile rack is fixedly connected to a nozzle, the mobile rack is provided with a heating chamber, a fan is installed on the side wall of the mobile rack, the base is fixedly connected to a thermal control unit, and the thermal control unit is fixedly connected and connected to a condenser. The present invention transports low-temperature liquid into the condenser through the thermal control unit to reduce the temperature of the gas near the fan, and uses the fan to blow on the throat, thereby reducing the temperature of the airflow around the throat, strengthening the heat dissipation effect of the throat, and then making the heat dissipation at the throat stable.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing device with a uniform cooling structure. Background Art

[0002] 3D printing technology, also known as additive manufacturing technology, is a technology that creates three-dimensional objects by stacking materials layer by layer. The 3D printing equipment uses a feeding mechanism to feed the wire into the nozzle, which is melted by the heating component in the nozzle for printing. It is generally composed of a wire rack, a feeding mechanism, a nozzle and a motion control system.

[0003] There is an area on the upper side of the nozzle's heating assembly called the throat, which is the transfer position for heating the wire. When the nozzle is working, the temperature at the throat rises, causing the wire at the throat to expand thermally, which in turn blocks the throat and makes the device unable to work normally.

[0004] The existing solution is to dissipate heat by blowing directly into the throat through a fan on one side. However, when the nozzle works in one area for a long time, the temperature of the surrounding air will rise as a whole, forming a hot air gathering area that wraps around the nozzle, making the wind blown by the fan hot air, resulting in poor heat dissipation effect at the throat. In addition, one-sided heat dissipation will cause uneven heat dissipation at the throat, which will cause heat to accumulate on the leeward side of the throat during printing, causing the wire on the leeward side to swell and cause blockage. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned background technology, the technical problem of the present invention is to provide a 3D printing device with a uniform cooling structure.

[0006] The technical implementation scheme of the present invention is: a 3D printing device with a uniform cooling structure, comprising a base, a control terminal and a loading rack are respectively fixedly connected on both sides of the base, a driving unit is arranged on the upper side of the base, a feeding shell is fixedly connected on one side of the driving unit, the driving unit is provided with a moving frame, the moving frame is provided with a limiting cover, a sleeve is fixedly connected between the feeding shell and the limiting cover, the limiting cover is provided with a throat connected to the moving frame for rotation, the moving frame is provided with a heating unit, the moving frame is fixedly connected with a nozzle, a heating chamber connected to both the throat and the nozzle is arranged in the moving frame, and the The mobile frame is equipped with a fan, the feeding shell is fixedly connected with a conveying motor, the output shaft of the conveying motor is fixedly connected with a first conveying roller rotatably connected with the feeding shell, a clamping rod is arranged on the upper side of the feeding shell, the clamping rod is rotatably connected with a second conveying roller, the base is fixedly connected with a thermal control unit, the thermal control unit, the driving unit, the fan and the conveying motor are all electrically connected with the control terminal, the thermal control unit is fixedly connected and communicated with a condenser fixedly connected with the mobile frame, the condenser is provided with a temperature control component for adjusting the flow rate of the liquid therein, and the mobile frame is provided with a rotating component for driving the throat to rotate;

[0007] The temperature control component includes a liquid sleeve, the liquid sleeve is fixedly connected to a side of the mobile frame close to the fan, the liquid sleeve is slidably connected to a baffle plate, a thermosensitive liquid is injected between the liquid sleeve and the baffle plate, the side of the condenser tube close to the fan is fixedly connected and communicated with a regulating shell, the regulating shell is slidably connected to the baffle plate, and the baffle plate is used to regulate the flow area of ​​the liquid in the condenser tube;

[0008] The rotating assembly includes a first rotating rod, the first rotating rod is fixedly connected to the power output shaft of the fan, the movable frame is rotatably connected to the second rotating rod, the second rotating rod is connected to the first rotating rod through a bevel gear transmission, the second rotating rod is fixedly connected to the first gear, the throat is fixedly connected to the second gear, and the first gear is meshed with the second gear.

[0009] Furthermore, the throat is composed of a cylindrical tube and circular rings distributed in a linear array, and the diameters of the circular rings distributed in the linear array vary in steps.

[0010] Furthermore, an adjusting mechanism is also included, which is arranged on the upper side of the feeding shell, and is used to adjust the downward pressure of the clamping rod. The adjusting mechanism includes a rotating pressure block, which is hinged to the upper side of the feeding shell, and a T-shaped pressure rod is slidably connected to the middle part of the rotating pressure block, and the T-shaped pressure rod is slidably connected to the feeding shell, and the T-shaped pressure rod is slidably connected to the clamping rod, and a first elastic member is fixedly connected between the T-shaped pressure rod and the clamping rod, and a gravity rod is fixedly connected to the side wall of the rotating pressure block, and a feeding detection assembly is provided on the side wall of the feeding shell, and the feeding detection assembly is used to detect the wire in the sleeve, and a locking assembly is provided on the side of the feeding shell close to the sleeve, and the locking assembly is used to lock the T-shaped pressure rod.

[0011] Furthermore, the gravity rod is threadedly connected with a gravity ball.

[0012] Furthermore, the feeding detection assembly includes a symmetrically distributed detection seat, the detection seat is fixed to the feeding shell, the detection seat is rotatably connected to a detection rod, the opposite sides of the symmetrically distributed detection rods both penetrate the sleeve, and a second elastic member is fixed between the detection rod and the adjacent detection seat.

[0013] Furthermore, the locking assembly includes a locking rod, which is slidably connected to the feeding shell, the locking rod is squeezed together with the adjacent detection rod, a third elastic member is fixed between the locking rod and the feeding shell, and the locking rod is limitedly matched with the T-shaped pressure rod.

[0014] Furthermore, it also includes a blockage detection mechanism, which is arranged on a side of the movable frame away from the fan, and the blockage detection mechanism is used to perform pressure detection on the heating chamber in the movable frame, and the blockage detection mechanism includes a detection sleeve, which is fixedly connected to the lower side of the movable frame, the detection sleeve is communicated with the heating chamber in the movable frame, the detection sleeve is slidably connected with an unlocking rod, and a trigger switch is fixedly connected to the side of the movable frame away from the fan, the trigger switch is electrically connected to the control terminal, the trigger switch is squeezed and matched with the unlocking rod, the unlocking rod is limitedly matched with the limit cover, the limit cover is slidably connected to the movable frame, the limit cover is slidably and rotatably connected to the throat, a fourth elastic member is fixedly connected between the limit cover and the movable frame, and a feedback component is arranged in the detection sleeve, and the feedback component is used to buffer the pressure of the heating chamber in the movable frame.

[0015] Furthermore, the feedback assembly includes a resistance rod, the resistance rod is slidably connected in the detection sleeve and the two are sealed together, and a fifth elastic member is fixedly connected between the resistance rod and the unlocking rod.

[0016] The present invention has the following advantages: the present invention delivers low-temperature liquid into the condenser through the thermal control unit, so that the temperature of the gas near the fan is reduced, and the fan is used to blow on the throat, so as to reduce the temperature of the airflow around the throat, strengthen the heat dissipation effect of the throat, and thus stabilize the heat dissipation at the throat; the fan drives the throat to rotate, so that the throat is in uniform contact with the wind blown by the fan, so as to achieve the effect of uniform heat dissipation of the throat; through the thermal expansion and contraction of the thermosensitive liquid in the liquid sleeve, the baffle plate moves in the cross-section of the regulating shell and the condenser, so that the heat exchange efficiency of the condenser near the fan is changed, and thus the heat exchange efficiency of the condenser is improved. The gas temperature around the throat can achieve a self-regulating effect; the first elastic member is compressed by the rotating pressure block, so that the first elastic member applies a constant extrusion force to the wire, and under the conveyance of the first conveying roller, a good conveying effect can be achieved for wires of different thicknesses; the position of the gravity ball on the gravity rod is adjusted to change the torque generated by the gravity ball on the first elastic member, thereby adjusting the extrusion force of the first conveying roller on the wire, thereby satisfying the different extrusion forces applied due to different wires, and avoiding deformation of the wire due to excessive extrusion; the torsional force applied to the detection rod by the second elastic member makes the detection rod The two rollers have a tendency to approach each other, thereby guiding the wire in the sleeve to avoid bending stress caused by long-term storage of the wire on the loading rack; by rotating the detection rod, the locking rod limits the T-shaped pressure rod under the action of the spring, so that the squeezing force of the T-shaped pressure rod on the first elastic member is stable, thereby preventing the vibration caused by the movement of the drive unit in normal use, which leads to unstable squeezing force of the second conveyor roller on the wire; when the wire is blocked, the pressure in the heating chamber in the moving rack increases, the wire liquid in the heating chamber moves, so that the unlocking rod releases the limit on the limit cover and squeezes the trigger switch to control the terminal The conveying motor is closed at the end, and the limit cover moves outward under the elastic force of the fourth elastic member, thereby increasing the volume of the space between the heating chamber in the moving frame and the limit cover, thereby generating negative pressure, pulling out the wire blocked at the nozzle, thereby reducing the degree of nozzle blockage and preventing the conveying motor from continuously feeding and causing the nozzle to be further blocked; the resistance rod is moved to cause the fifth elastic member to be compressed and changed, so that the melted wire in the heating chamber in the moving frame can buffer the fluctuating pressure of the unlocking rod, thereby avoiding the pressure change in the heating chamber caused by the driving unit driving the moving frame to move, which causes the unlocking rod to open and cause a misjudgment of blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the feeding shell, the movable frame and the sleeve of the present invention;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the movable frame, throat and nozzle of the present invention;

[0020] Figure 4 It is a three-dimensional structural cross-sectional view of the movable frame and the limiting cover of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the conveying motor, the first conveying roller and the clamping rod of the present invention;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the fan, the regulating shell and the liquid sleeve of the present invention;

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the temperature control component of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotating assembly of the present invention;

[0025] Fig. 9 It is a three-dimensional structural schematic diagram of the adjustment mechanism of the present invention;

[0026] Fig.10 It is a three-dimensional structural schematic diagram of the feeding detection component and the locking component of the present invention;

[0027] Fig.11 It is a three-dimensional structural schematic diagram of the blockage detection mechanism of the present invention;

[0028] Fig.12 It is a schematic diagram of the three-dimensional structure of the feedback component of the present invention.

[0029] The meanings of the reference numerals in the figure are as follows: 1: base, 2: control terminal, 3: loading rack, 4: driving unit, 5: feeding shell, 6: moving rack, 7: limiting cover, 8: sleeve, 9: throat, 10: heating unit, 11: nozzle, 12: fan, 13: conveying motor, 14: first conveying roller, 15: clamping rod, 16: second conveying roller, 17: thermal control unit, 18: condenser, 22: temperature control assembly, 201: liquid sleeve, 202: baffle plate, 203: regulating shell, 33: rotating assembly, 301: first rotating rod, 302: second rotating rod, 303: first Gear, 304: second gear, 44: adjusting mechanism, 401: rotating pressure block, 402: T-type pressure rod, 403: first elastic member, 404: gravity rod, 405: gravity ball, 55: feeding detection assembly, 501: detection seat, 502: detection rod, 503: second elastic member, 66: locking assembly, 601: locking rod, 602: third elastic member, 77: blocking detection mechanism, 701: detection sleeve, 702: unlocking rod, 703: trigger switch, 704: fourth elastic member, 88: feedback assembly, 801: resistance rod, 802: fifth elastic member. DETAILED DESCRIPTION

[0030] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] Embodiment 1: A 3D printing device with a uniform cooling structure, such as Figure 1-Figure 8As shown, it includes a base 1, a control terminal 2 is fixedly connected to the right side of the base 1, a loading rack 3 is fixedly connected to the left side of the base 1, a driving unit 4 is arranged on the upper side of the base 1, the driving unit 4 is electrically connected to the control terminal 2, a feeding shell 5 is fixedly connected to the left side of the driving unit 4, a moving rack 6 is arranged in the middle of the driving unit 4, the driving unit 4 is used to drive the moving rack 6 to move in space, a limiting cover 7 is arranged on the upper side of the moving rack 6, a sleeve 8 is fixedly connected between the feeding shell 5 and the limiting cover 7, the sleeve 8 is a flexible sleeve, a throat 9 is arranged on the lower side of the limiting cover 7, the throat 9 is composed of a cylindrical tube and a plurality of circular rings, the circular rings are used to increase the heat dissipation area of ​​the throat 9, and the diameter of the circular rings is a step change that gradually decreases from top to bottom, and is used to step the wire at the throat 9 Heat dissipation is convenient for preheating the wire near the lower side first, ensuring the heat dissipation of the throat 9 while preheating the wire entering the heating chamber. The movable frame 6 is rotatably connected to the throat 9. A heating unit 10 is arranged on the lower side of the movable frame 6. The heating unit 10 is used to heat the wire. A nozzle 11 is fixedly connected to the lower side of the movable frame 6. The nozzle 11 is used for extruding the wire. A temperature detector is arranged on the lower side of the movable frame 6. The heating unit 10 and the temperature detector are existing devices. The heating unit 10 and the temperature detector are both electrically connected to the control terminal 2. The internal structure thereof is not described here. The temperature detector is used to detect the temperature at the nozzle 11. The nozzle 11 is located on the lower side of the heating unit 10 and the temperature detector. A heating chamber is arranged on the lower side of the movable frame 6. The heating chamber is located between the heating unit 10 and the temperature detector. The heating chamber is used to store the melted wire material, and the heating chamber is connected to the throat 9 and the nozzle 11. A fan 12 is installed on the left side of the mobile frame 6, and the fan 12 is electrically connected to the control terminal 2. The fan 12 is used to cool the throat 9. A conveying motor 13 is fixedly connected to the front side of the feeding shell 5, and the conveying motor 13 is electrically connected to the control terminal 2. The output shaft of the conveying motor 13 is fixedly connected to a first conveying roller 14, and the first conveying roller 14 is rotatably connected to the feeding shell 5. A clamping rod 15 is provided on the upper side of the feeding shell 5, and the clamping rod 15 is rotatably connected to a second conveying roller 16. The first conveying roller 14 and the second conveying roller 16 are used to apply a stable extrusion force to the wire material, and are used to stably convey the wire material. A thermal control unit 17 is fixedly connected to the left side of the base 1, and the thermal control unit 1 7 is electrically connected to the control terminal 2. The thermal control unit 17 is composed of a water pump, a compressor, a sensor, etc., and the internal devices are all existing devices. Its internal structure is not described in detail here. The thermal control unit 17 is fixedly connected and connected to a condenser 18. The condenser 18 is fixedly connected to the left side of the movable frame 6. The condenser 18 is filled with liquid, which is a condensate and is used to cool the air at the fan 12. The condenser 18 at the fixed position of the movable frame 6 is arranged in a serpentine shape to improve the cooling efficiency of the air around the fan 12. A temperature control component 22 is arranged on the front side of the condenser 18. The temperature control component 22 is used to adjust the flow rate of the liquid in the condenser 18. A rotating component 33 is arranged on the upper side of the movable frame 6. The rotating component 33 is used to drive the throat 9 to rotate.

[0032] like Figure 6 and Figure 7 As shown, the temperature control component 22 includes a liquid sleeve 201, which is fixedly connected to the left side of the movable frame 6. The inner side 201 of the liquid sleeve is slidably connected with a baffle plate 202. A thermosensitive liquid is injected between the liquid sleeve 201 and the baffle plate 202. The thermosensitive liquid is liquid paraffin, which is used to detect the air temperature around the fan 12, and then adjust the flow section of the condenser 18. The baffle plate 202 is composed of a piston rod and a baffle. The left side of the baffle is arc-shaped, which is used to ensure that the condenser 18 still has a cooling effect on the air around the fan 12 at low temperatures. The front side of the condenser 18 is fixedly connected and connected with a regulating shell 203. The regulating shell 203 is slidably connected to the baffle part of the baffle plate 202. The baffle plate 202 is used to adjust the flow area of ​​the liquid in the condenser 18.

[0033] like Figure 8 As shown, the rotating assembly 33 includes a first rotating rod 301, the first rotating rod 301 is fixedly connected to the power output shaft of the fan 12, the upper side of the movable frame 6 is rotatably connected to the second rotating rod 302, the second rotating rod 302 is connected to the first rotating rod 301 through a bevel gear transmission, the upper side of the second rotating rod 302 is fixedly connected to the first gear 303, the upper side of the throat 9 is fixedly connected to the second gear 304, the first gear 303 is meshed with the second gear 304, and the power of the fan 12 is transmitted to the throat 9, so that the throat 9 rotates, and the side wall of the throat 9 is evenly cooled.

[0034] When using the device, the staff first imports the model data into the control terminal 2, and then the staff inserts the wire on the loading rack 3 into the feeding shell 5, so that the wire passes through the gap between the first conveyor roller 14 and the second conveyor roller 16, and then enters the sleeve 8. The second conveyor roller 16 and the first conveyor roller 14 squeeze the wire between them and keep the wire stable. Then the staff turns on the control terminal 2, and the control terminal 2 starts the heating unit 10 first. The heating unit 10 first heats the heating chamber in the mobile rack 6 to make the temperature of the heating chamber reach the standard, and then starts the conveying motor 13 to convey the wire. The conveying motor 13 drives the first conveying roller 14 to rotate. Under the squeezing of the first conveying roller 14 and the second conveying roller 16, the wire begins to move to the right, and the wire passes through the sleeve 8, the limit cover 7, and the throat 9 in turn into the heating chamber in the movable frame 6. The wire begins to melt in the heating chamber. As the wire gradually melts, the pressure in the heating chamber gradually increases. When the pressure reaches a specified value, the melted wire in the heating chamber is ejected from the nozzle 11. At this time, the staff starts the drive unit 4 through the control terminal 2, so that the drive unit 4 drives the movable frame 6 to move accordingly according to the imported model data, and starts printing.

[0035] When printing, the control terminal 2 starts the fan 12, and the fan 12 drives the air around it to flow toward the throat 9, so that the hot air around the throat 9 diffuses outward, thereby cooling the throat 9, and preventing the wire at the throat 9 from expanding due to excessive temperature and blocking the throat 9. When the drive unit 4 starts the fan 12, the thermal control unit 17 starts synchronously, and the thermal control unit 17 transports low-temperature liquid into the condenser 18, and performs heat exchange on the air flow near the fan 12 through the condenser 18 to reduce the temperature at the fan 12, further improving the cooling effect of the fan 12 on the throat 9. At the same time, the liquid in the condenser 18 flows back to the thermal control unit 17 after passing through the fan 12, and the thermal control unit 17 cools the reflux liquid and transports the low-temperature liquid to the condenser 18 again, thereby circulating.

[0036] When the fan 12 is started, the power output end of the fan 12 drives the first rotating rod 301, and the first rotating rod 301 drives the second rotating rod 302 to rotate through the bevel gear set, and the second rotating rod 302 drives the first gear 303 to rotate, and the first gear 303 drives the second gear 304 to rotate, and the second gear 304 drives the throat pipe 9 to rotate, so that the side wall of the throat pipe 9 is in uniform contact with the air driven by the fan 12, and then the throat pipe 9 is evenly cooled around, avoiding temperature difference on the side wall of the throat pipe 9, causing local expansion of the internal wire, causing additional resistance to the wire during the transportation process, resulting in unstable transportation of the wire.

[0037] As the device is used, the temperature around the throat 9 gradually increases, the thermosensitive liquid in the liquid sleeve 201 begins to expand, and the thermosensitive liquid pushes the baffle plate 202 to move. The baffle plate 202 slides to the right along the regulating shell 203, thereby increasing the flow area between the regulating shell 203 and the condenser 18, causing the liquid flow of the condenser 18 near the fan 12 to increase, and reducing the temperature of the condenser 18 near the fan 12, thereby improving the cooling effect of the hot air at the fan 12, and then improving the heat dissipation effect of the fan 12 on the throat 9. When the temperature drops, the thermosensitive liquid contracts, and the baffle plate 202 resets and moves, so that the flow area between the regulating shell 203 and the condenser 18 is restored. When the imported model data is completed, the control terminal 2 simultaneously turns off the heating unit 10, the fan 12, the conveying motor 13 and the thermal control unit 17, and then the control terminal 2 enables the drive unit 4 to drive the movable frame 6 to reset and close, completing the printing work of the device.

[0038] Embodiment 2: Based on embodiment 1, Fig. 9 and 10As shown, it also includes an adjustment mechanism 44, which is arranged on the upper side of the feeding shell 5. The adjustment mechanism 44 is used to adjust the downward pressure of the clamping rod 15. The adjustment mechanism 44 includes a rotating pressure block 401, which is hinged on the upper side of the feeding shell 5. The middle part of the rotating pressure block 401 is slidably connected with a T-shaped pressure rod 402, which is slidably connected to the feeding shell 5, and the T-shaped pressure rod 402 is slidably connected to the clamping rod 15. A first elastic member 403 is fixedly connected between the T-shaped pressure rod 402 and the clamping rod 15. The first elastic member 403 is a spring and is used to adjust the T-shaped pressure rod 402. The distance between the rod 402 and the clamping rod 15 enables the rotating pressure block 401 to apply a constant downward pressure to wires of different thicknesses. A gravity rod 404 is fixedly connected to the left side of the rotating pressure block 401. The gravity rod 404 is threadedly connected to a gravity ball 405. The gravity ball moves along the gravity rod 404 to adjust the torque of the rotating pressure block 401. A feeding detection component 55 is provided on the right side of the feeding shell 5. The feeding detection component 55 is used to detect the wire in the sleeve 8. A locking component 66 is provided on the right side of the feeding shell 5. The locking component 66 is used to lock the T-shaped pressure rod 402.

[0039] like Fig. 9 and Fig.10 As shown, the feeding detection assembly 55 includes a detection seat 501 symmetrically distributed up and down, the detection seat 501 is fixed to the right side of the feeding shell 5, the detection seat 501 is rotatably connected to the detection rod 502, the detection rod 502 is composed of a straight rod and a roller, the straight rod is rotatably connected to the adjacent roller, the roller is used to reduce the friction on the wire, the left side of the sleeve 8 is provided with a rectangular groove symmetrical up and down, the detection rod 502 passes through the adjacent rectangular grooves on the sleeve 8, and a second elastic member 503 is fixed between the detection rod 502 and the adjacent detection seat 501, and the second elastic member 503 is a torsion spring for resetting the detection rod 502.

[0040] like Fig.10 As shown, the locking assembly 66 includes a locking rod 601, which is horizontally slidably connected to the right side of the feeding shell 5, and the locking rod 601 is squeezed and matched with the upper detection rod 502. The left side of the locking rod 601 is made of rubber material, which is used to increase the friction between the T-shaped pressure rod 402 and the locking rod 601. A third elastic member 602 is fixedly connected between the locking rod 601 and the feeding shell 5. The third elastic member 602 is a tension spring, and the tension spring is initially in a stretched state. The locking rod 601 is limited and matched with the T-shaped pressure rod 402.

[0041] When the staff passes the wire on the loading rack 3 through the feeding shell 5, the staff first lifts the rotating pressure block 401, and the rotating pressure block 401 drives the T-shaped pressure rod 402 to move upward, and the T-shaped pressure rod 402 drives the clamping rod 15 and the second conveying roller 16 to move upward through the first elastic member 403. After the staff passes the wire through between the first conveying roller 14 and the second conveying roller 16, the staff releases the rotating pressure block 401. The rotating pressure block 401 rotates downward under the action of the gravity ball 405 and drives the T-shaped pressure rod 402 to move downward at the same time. The T-shaped pressure rod 402 moves the clamping rod 15 and the second conveying roller 16 downward through the first elastic member 403. When the second conveying roller 16 contacts the wire, it stops moving, and the T-shaped pressure rod 402 continues to move downward, and the first elastic member 403 is compressed. The second conveying roller 16 applies a squeezing force equal to the gravity of the gravity ball 405 to the wire, and compresses the first elastic member 403 through the gravity ball 405, so that the second conveying roller 16 applies a stable squeezing force to wires of different diameters, thereby improving the applicability of the device.

[0042] When the wire enters the sleeve 8, the wire squeezes the detection rod 502, and the symmetrically distributed detection rods 502 rotate in opposite directions, and the second elastic member 503 is twisted. Under the action of the second elastic member 503, the symmetrically distributed detection rods 502 tend to approach each other, and the trend of the detection rod 502 guides the wire in the sleeve 8. During the rotation of the detection rod 502, the upper detection rod 502 is disengaged from the locking rod 601, thereby releasing the limit on the locking rod 601. Under the action of the pulling force of the third elastic member 602, the locking rod 601 moves to the left. When the locking rod 601 contacts the T-shaped pressure rod 402, the locking rod 601 squeezes the T-shaped pressure rod 402 under the action of the third elastic member 602, thereby making the T-shaped pressure rod 402 work in a stable state during the printing process of the device.

[0043] Before the staff puts the wire into the feeding shell 5, due to the different materials of the wire, resulting in different surface smoothness, different clamping forces are required. At this time, the staff adjusts the position of the gravity ball 405 on the gravity rod 404 to change the torque of the gravity ball 405 on the rotating pressure block 401, so that the second conveying roller 16 produces different extrusion forces on the wire to adapt to wires of different materials, thereby further improving the applicability of the device.

[0044] Embodiment 3: Based on embodiment 2, Fig.11 and Fig.12As shown, it also includes a blockage detection mechanism 77, which is arranged on the right side of the mobile frame 6. The blockage detection mechanism 77 is used to perform pressure detection on the heating chamber in the mobile frame 6. The blockage detection mechanism 77 includes a detection sleeve 701, which is fixed to the right part of the lower side of the mobile frame 6. The detection sleeve 701 is connected to the heating chamber in the mobile frame 6. The detection sleeve 701 is connected to the unlocking rod 702 in a sliding manner inside the detection sleeve 701. A trigger switch 703 is fixed to the right side of the mobile frame 6. The trigger switch 703 is electrically connected to the control terminal 2. The trigger switch 703 is located on the right side of the detection sleeve 701. The unlocking rod 702 squeezes the trigger switch 703, so that the trigger switch 703 turns off the conveying motor 13 through the unlocking rod 702, thereby preventing the continuous feeding in the throat 9 from causing the blockage to worsen, the unlocking rod 702 and the limit cover 7 limit cooperation, the limit cover 7 and the moving frame 6 are slidingly connected, the limit cover 7 and the throat 9 are slidingly and rotatably connected, a fourth elastic member 704 is fixedly connected between the limit cover 7 and the moving frame 6, the fourth elastic member 704 spring, the initial state of the 704 spring is a compressed state, a feedback component 88 is arranged in the detection sleeve 701, and the feedback component 88 is used to buffer the pressure of the heating chamber in the moving frame 6.

[0045] like Fig.12 As shown, the feedback assembly 88 includes a resistance rod 801, which is slidably connected to the left side of the detection sleeve 701 and sealed between the two. A fifth elastic member 802 is fixed between the resistance rod 801 and the unlocking rod 702. The fifth elastic member 802 is a spring for buffering the liquid pressure in the heating chamber.

[0046] During normal printing, the driving unit 4 drives the moving frame 6 to move, which causes pressure to be generated in the heating chamber. The pressure causes the resistance rod 801 in the detection sleeve 701 to move to the right and compress the fifth elastic member 802. When the elastic force of the fifth elastic member 802 is less than the friction force of the unlocking rod 702 on the limit cover 7, the resistance rod 801 cannot drive the unlocking rod 702 to move. The fifth elastic member 802 buffers the pressure fluctuations in the heating chamber during normal operation, thereby preventing the unlocking rod 702 from releasing the limit on the limit cover 7 due to the pressure change in the heating chamber caused by the movement of the driving unit 4 during normal use.

[0047] When the device is working, due to the excessively high temperature at the nozzle 11, thermal creep occurs at this location of the wire, resulting in the wire being blocked at the nozzle 11, while the first conveying roller 14 is still working, causing the wire to continuously move toward the heating chamber of the movable frame 6, resulting in an increase in the pressure in the heating chamber. The increase in the pressure in the heating chamber causes the resistance rod 801 to move to the right and compress the fifth elastic member 802. When the fifth elastic member 802 is compressed to the limit, the elastic force of the fifth elastic member 802 is greater than the friction force of the unlocking rod 702 on the limit cover 7, and the resistance rod 801 drives the unlocking rod 702 to move, and the unlocking rod 702 moves to the right. When the unlocking rod 702 loses contact with the limit cover 7, the unlocking rod 702 is released. With respect to the limiting cover 7, the limiting cover 7 moves upward under the elastic force of the fourth elastic member 704, and the volume between the limiting cover 7 and the heating chamber increases, so that negative pressure is generated between the limiting cover 7 and the heating chamber, and the negative pressure drives the wire blocked at the nozzle 11 to be pulled out upward, so that the blockage degree of the wire in the nozzle 11 is reduced. When the unlocking rod 702 loses the contact with the limiting cover 7, the unlocking rod 702 squeezes the trigger switch 703, and the trigger switch 703 turns off the conveying motor 13, and the heating unit 10 continues to work to melt the wire blocked in the nozzle 11. When the operation of the imported model data is completed, the control terminal 2 turns off the heating unit 10 and other originals, and ends this printing.

[0048] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any equivalent substitution made within the principle of the present invention should be included in the protection scope of the present invention. The content not elaborated in detail in the present invention belongs to the existing technology known to the technicians in this professional field.

Claims

1. A 3D printing device with a uniform cooling structure, characterized in that: The invention comprises a base (1), wherein a control terminal (2) and a loading frame (3) are respectively fixedly connected to two sides of the base (1), a driving unit (4) is arranged on the upper side of the base (1), a feeding shell (5) is fixedly connected to one side of the driving unit (4), the driving unit (4) is provided with a moving frame (6), the moving frame (6) is provided with a limiting cover (7), a sleeve (8) is fixedly connected between the feeding shell (5) and the limiting cover (7), the limiting cover (7) is provided with a throat (9) rotatably connected to the moving frame (6), the moving frame (6) is provided with a heating unit (10), the moving frame (6) is fixedly connected with a nozzle (11), a heating chamber connected to both the throat (9) and the nozzle (11) is arranged in the moving frame (6), the moving frame (6) is equipped with a fan (12), the feeding shell (5) is provided with a heating chamber connected to the heating chamber (10), and the heating chamber connected to the heating chamber (10) is provided in the moving frame (6). ) is fixedly connected to a conveying motor (13), the output shaft of the conveying motor (13) is fixedly connected to a first conveying roller (14) rotatably connected to the feeding shell (5), a clamping rod (15) is arranged on the upper side of the feeding shell (5), the clamping rod (15) is rotatably connected to a second conveying roller (16), the base (1) is fixedly connected to a thermal control unit (17), the thermal control unit (17), the driving unit (4), the fan (12) and the conveying motor (13) are all electrically connected to the control terminal (2), the thermal control unit (17) is fixedly connected to and communicated with a condenser (18) fixedly connected to the moving frame (6), the condenser (18) is provided with a temperature control component (22) for adjusting the flow rate of the liquid therein, and the moving frame (6) is provided with a rotating component (33) for driving the throat (9) to rotate; The temperature control component (22) comprises a liquid sleeve (201), the liquid sleeve (201) is fixedly connected to a side of the movable frame (6) close to the fan (12), the liquid sleeve (201) is slidably connected to a baffle plate (202), a thermosensitive liquid is injected between the liquid sleeve (201) and the baffle plate (202), a side of the condenser (18) close to the fan (12) is fixedly connected and communicated with a regulating shell (203), the regulating shell (203) is slidably connected to the baffle plate (202), and the baffle plate (202) is used to regulate the flow area of ​​the liquid in the condenser (18); The rotating assembly (33) comprises a first rotating rod (301), the first rotating rod (301) is fixedly connected to the power output shaft of the fan (12), the moving frame (6) is rotatably connected to a second rotating rod (302), the second rotating rod (302) is connected to the first rotating rod (301) via a bevel gear transmission, the second rotating rod (302) is fixedly connected to a first gear (303), the throat (9) is fixedly connected to a second gear (304), and the first gear (303) is meshed with the second gear (304).

2. A 3D printing device with a uniform cooling structure according to claim 1, characterized in that: The throat (9) is composed of a cylindrical tube and circular rings distributed in a linear array, and the diameters of the circular rings distributed in the linear array vary in steps.

3. A 3D printing device with a uniform cooling structure according to claim 1, characterized in that: The invention also comprises an adjusting mechanism (44), wherein the adjusting mechanism (44) is arranged on the upper side of the feeding shell (5), and the adjusting mechanism (44) is used to adjust the downward pressure of the clamping rod (15), and the adjusting mechanism (44) comprises a rotating pressing block (401), wherein the rotating pressing block (401) is hinged on the upper side of the feeding shell (5), and a T-shaped pressing rod (402) is slidably connected to the middle part of the rotating pressing block (401), and the T-shaped pressing rod (402) is slidably connected to the feeding shell (5), and the T-shaped pressing rod (402) is slidably connected to the clamping rod (15). The rod (15) is slidably connected, a first elastic member (403) is fixedly connected between the T-shaped pressure rod (402) and the clamping rod (15), a gravity rod (404) is fixedly connected to the side wall of the rotating pressure block (401), a feeding detection component (55) is provided on the side wall of the feeding shell (5), and the feeding detection component (55) is used to detect the wire in the sleeve (8), and a locking component (66) is provided on the side of the feeding shell (5) close to the sleeve (8), and the locking component (66) is used to lock the T-shaped pressure rod (402).

4. A 3D printing device with a uniform cooling structure according to claim 3, characterized in that: The gravity rod (404) is threadedly connected with a gravity ball (405).

5. A 3D printing device with a uniform cooling structure according to claim 3, characterized in that: The feeding detection assembly (55) comprises symmetrically distributed detection seats (501), the detection seats (501) being fixedly connected to the feeding shell (5), the detection seats (501) being rotatably connected to detection rods (502), the opposite sides of the symmetrically distributed detection rods (502) both passing through the sleeve (8), and a second elastic member (503) being fixedly connected between the detection rods (502) and the adjacent detection seats (501).

6. A 3D printing device with a uniform cooling structure according to claim 5, characterized in that: The locking assembly (66) comprises a locking rod (601), the locking rod (601) is slidably connected to the feeding shell (5), the locking rod (601) is pressed and matched with the adjacent detection rod (502), a third elastic member (602) is fixedly connected between the locking rod (601) and the feeding shell (5), and the locking rod (601) is limitedly matched with the T-shaped pressure rod (402).

7. The 3D printing device with a uniform cooling structure according to claim 1, characterized in that: The mobile frame (6) further comprises a blockage detection mechanism (77), the blockage detection mechanism (77) being arranged on a side of the mobile frame (6) away from the fan (12), the blockage detection mechanism (77) being used to perform pressure detection on the heating chamber in the mobile frame (6), the blockage detection mechanism (77) comprising a detection sleeve (701), the detection sleeve (701) being fixedly connected to the lower side of the mobile frame (6), the detection sleeve (701) being in communication with the heating chamber in the mobile frame (6), the detection sleeve (701) being slidably connected to an unlocking rod (702), and a trigger switch being fixedly connected to a side of the mobile frame (6) away from the fan (12). (703), the trigger switch (703) is electrically connected to the control terminal (2), the trigger switch (703) is squeezed and matched with the unlocking rod (702), the unlocking rod (702) is limited and matched with the limit cover (7), the limit cover (7) is slidably connected to the movable frame (6), the limit cover (7) is slidably and rotatably connected to the throat (9), a fourth elastic member (704) is fixedly connected between the limit cover (7) and the movable frame (6), and a feedback component (88) is arranged in the detection sleeve (701), and the feedback component (88) is used to buffer the pressure of the heating chamber in the movable frame (6).

8. A 3D printing device with a uniform cooling structure according to claim 7, characterized in that: The feedback assembly (88) comprises a resistance rod (801), the resistance rod (801) is slidably connected to the detection sleeve (701) and the two are sealed together, and a fifth elastic member (802) is fixedly connected between the resistance rod (801) and the unlocking rod (702).

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