Falling piece detection mechanism and falling piece detection method for bottom exposure 3D printer

Abstract

The invention relates to a fallen part detection mechanism and fallen part detection method for a bottom exposure 3D printer, fallen parts can be found in time, equipment is controlled to stop, the fallen part detection mechanism comprises a base, and a resin groove is formed in the base; the scraper is positioned in the resin tank; the driving assembly comprises a motor and a transmission mechanism, and the transmission mechanism is connected with the output end of the motor and the scraper, so that the scraper can horizontally move in a reciprocating mode relative to the resin groove in the first direction, and materials in the resin groove are scraped to be flat; and the control system comprises a controller and a sensor, the sensor is configured to be used for detecting operation parameters of the motor, and the controller is configured to control the motor to stop rotating when it is judged that the operation parameters are out of a preset range.

Description

Technical Field

[0001] The present disclosure relates to the technical field of 3D printers, and in particular to a part drop detection mechanism and a detection method thereof for a bottom exposure 3D printer. Background Art

[0002] 3D printing is a type of rapid prototyping technology. It is a technology that uses digital model files as the basis and uses powdered metal, plastic, resin and other bondable materials to construct objects by printing layer by layer. 3D printing equipment manufactures 3D objects by executing this printing technology. 3D printing equipment is widely used in molds, customized products, medical fixtures, prostheses and other fields due to its high molding precision.

[0003] The 3D printing device based on bottom exposure includes a container for holding a photocurable material, an exposure device located below the bottom of the container, a component plate, and a Z-axis driving mechanism for driving the component plate to rise and fall. When the 3D printing device is used to print an object, the exposure device irradiates the photocurable material at the bottom of the container to form a first solidified layer, which is attached to the component plate. The component plate moves upward under the drive of the Z-axis driving mechanism, so that the solidified layer is separated from the bottom of the container. Then, the component plate is lowered so that the solidified material to be cured is filled between the bottom of the container and the first solidified layer, and irradiated again to obtain a second solidified layer attached to the first solidified layer. By analogy, after multiple separations and irradiations, each solidified layer is accumulated on the component plate to obtain a 3D component. The principle of the 3D printing device based on bottom exposure can be further referred to the prior art, such as Chinese patent CN106985382B.

[0004] During the printing process, if there is a drop in the part, it is necessary to find it in time, stop printing, and deal with it in time. If the abnormality is not found, the printer continues to print according to the data queue, the printing material will be wasted, and even the equipment will be damaged. Summary of the invention

[0005] Based on this, it is necessary to propose a dropped part detection mechanism for a bottom exposure 3D printer, which can effectively detect whether there are dropped parts in the resin tank. A 3D printer is also proposed.

[0006] A dropped part detection mechanism for a bottom exposure 3D printer comprises a base, on which a resin tank is provided; a scraper, located in the resin tank; a driving component, the driving component comprising a motor and a transmission mechanism, the transmission mechanism connecting the output end of the motor and the scraper, so that the scraper can reciprocate and translate relative to the resin tank along a first direction to scrape the material in the resin tank; and a control system, comprising a controller and a sensor, the sensor being configured to detect an operating parameter of the motor, and the controller being configured to control the motor to stop when it is determined that the operating parameter is outside a preset range.

[0007] In some embodiments, the sensor is a torque sensor for obtaining the torque of the motor; or, the sensor is a current sensor for obtaining the current value of the motor.

[0008] In some embodiments, the transmission mechanism includes a first transmission component and a second transmission component, and the first transmission component and the second transmission component are respectively located on both sides of the resin tank in the second direction; the two ends of the scraper in the second direction are respectively connected to the first transmission component and the second transmission component; the second direction is perpendicular to the first direction.

[0009] In some embodiments, the first transmission assembly includes a first pulley and a second pulley, the first pulley is connected to the output end of the motor with a transmission, the second pulley is driven by the first pulley through a first transmission belt, and one end of the scraper in the second direction is connected to the first transmission belt with a transmission.

[0010] In some embodiments, the dropped parts detection mechanism for the bottom exposure 3D printer also includes a first guide rail and a first fixed block, wherein the first guide rail is arranged along the second direction and fixed to the base; the first fixed block is connected to one end of the scraper in the second direction, the first fixed block is fixed to the first transmission belt, and the first fixed block is slidably matched with the first guide rail in the second direction.

[0011] In some embodiments, the second transmission assembly includes a third pulley and a fourth pulley, the third pulley is coaxially connected to the first pulley via a transmission shaft, and the fourth pulley and the third pulley are driven by a second transmission belt; the other end of the scraper in the second direction is transmission-connected to the second transmission belt.

[0012] In some embodiments, the dropped parts detection mechanism for the bottom exposure 3D printer also includes a second guide rail and a second fixed block, the second guide rail is arranged along the second direction and fixed to the base; the second fixed block is connected to the other end of the scraper in the second direction, the second fixed block is fixed to the second transmission belt, and the second fixed block is slidably matched with the second guide rail in the second direction.

[0013] In some embodiments, the transmission shaft is located on one side of the resin tank in the first direction.

[0014] A method for detecting dropped parts is applied to the above-mentioned dropped parts detection mechanism, and the method includes: controlling the driving component to drive the scraper to reciprocate and translate along a first direction; obtaining the operating parameters of the motor detected by the sensor; and controlling the motor to stop when it is determined that the operating parameters are outside a preset range.

[0015] In some embodiments, the operating parameter is the torque or current value of the motor.

[0016] In the present disclosure, by monitoring whether the operating parameters of the motor driving the scraper are within the expected range, it is determined whether the scraper used to scrape the photocurable material is operating normally, thereby determining whether parts are falling off in the resin tank. In this way, part falling can be discovered in time and the equipment can be controlled to shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of a part drop detection mechanism for a bottom exposure 3D printer according to an embodiment of the present disclosure.

[0018] FIG. 2 is a front structural diagram of a dropped component detection mechanism for a bottom exposure 3D printer according to an embodiment of the present disclosure.

[0019] FIG. 3 is a top view of a component drop detection mechanism for a bottom exposure 3D printer according to an embodiment of the present disclosure.

[0020] FIG4 is a control principle diagram of a method for detecting dropped parts according to an embodiment of the present disclosure.

[0021] Reference numerals:

[0022] 100, part drop detection mechanism; 10, base; 110, resin tank; 20, scraper; 30, drive assembly; 310, motor; 320, transmission mechanism; 330, first transmission assembly; 331, first pulley; 332, second pulley; 333, first transmission belt; 334, first guide rail; 335, first fixing block; 3351, first upper piece; 3352, first lower piece; 340, second transmission assembly; 341, second pulley; 342, second pulley; 343, second transmission belt; 344, second guide rail Rail; 345, second fixed block; 3451, second upper piece; 3452, second lower piece; 350, first connecting assembly; 351, first mounting piece; 3511, first threaded hole portion; 352, first adjusting piece; 353, first adapter; 360, transmission shaft; 370, second connecting assembly; 371, second mounting piece; 3711, second threaded hole portion; 372, second adjusting piece; 373, second adapter; 40, control system; 410, controller; 420, sensor; 430, alarm device. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present disclosure, so the present disclosure is not limited by the specific embodiments disclosed below.

[0024] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial X", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure 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 cannot be understood as a limitation on the present disclosure.

[0025] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] As described in the background technology, the bottom exposure 3D printing device in the prior art needs to be able to detect the part drop in time during operation so as to stop printing and handle it in time. In view of the above problem, an embodiment of the first aspect of the present disclosure provides a part drop detection mechanism for a bottom exposure 3D printer, which can detect the part drop in time.

[0027] Referring to FIGS. 1 to 4 , a part drop detection mechanism 100 for a bottom exposure 3D printer includes a base 10, a scraper 20, a drive assembly 30, and a control system 40. A resin tank 110 is provided on the base 10. The scraper 20 is located in the resin tank 110. The drive assembly 30 includes a motor 310 and a transmission mechanism 320, wherein the transmission mechanism 320 is connected to the output end of the motor 310 and the scraper 20, so that the scraper 20 can reciprocate relative to the resin tank 110 in a first direction (specifically, in FIG. 1 , the up and down direction) to scrape the material in the resin tank 110. The control system 40 includes a controller 410 and a sensor 420, wherein the sensor 420 is configured to detect the operating parameters of the motor 310, and the controller 410 is configured to control the motor 310 to stop when it is determined that the operating parameters are outside a preset range.

[0028] The base 10 is the installation base of other components in the dropped component detection mechanism 100. When the dropped component detection mechanism 100 is used, the base 10 is located below a component plate (not shown) that can be raised and lowered in the 3D printer. The resin tank 110 containing the photocurable material is vertically opposite to the component plate. An exposure device (not shown) is provided below the resin tank 110.

[0029] The scraper 20 is disposed in the resin tank 110. The scraper 20 is used to scrape the light-curing material in the resin tank 110 in time after each lifting of the component plate during the printing process.

[0030] The drive assembly 30 is used to drive the scraper 20 to reciprocate in the first direction. It should be noted that the motor 310 in the present disclosure is a motor 310 that can rotate forward and reverse. The transmission mechanism 320 connects the output end of the motor 310 and the scraper 20, and converts the rotational motion of the output end of the motor 310 into the reciprocating motion of the scraper 20. In other words, the transmission mechanism 320 is a rotational motion-linear motion conversion mechanism.

[0031] In the control system 40, the sensor 420 is used to obtain the operating parameters of the motor 310 and transmit them to the controller 410. The controller 410 determines whether the operating parameters of the motor 310 are within a preset range. When the operating parameters of the motor 310 are outside the preset range, it is determined that the reciprocating movement of the scraper 20 is abnormal, so that the controller 410 determines that there is a part falling in the resin tank 110, and then controls the motor 310 to stop, so as to prevent the scraper 20 from continuing to move and being damaged.

[0032] The controller 410 can control the operation of the motor 310 and other components in the 3D printer according to a preset program or received instructions. The controller 410 can be an embedded digital signal processor (DSP), a microprocessor (MPU), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a system on chip (SOC), a central processing unit (CPU) or a field programmable gate array (FPGA). It can be understood that the specific type of the controller 410 is not limited in this embodiment.

[0033] Furthermore, after the controller 410 determines that parts have fallen out of the resin tank 110, the controller 410 also controls other components in the 3D printer, such as the component plate, the exposure device, etc., to stop working, thereby also avoiding damage to other components of the printing device.

[0034] Furthermore, the part drop detection mechanism 100 may also include an alarm device 430. The alarm device 430 is connected to the controller 410 in communication. The alarm device 430 may be a sound alarm device 430 or a light alarm device 430. After the controller 410 determines that a part has dropped in the resin tank 110, the alarm device 430 may emit a sound or change the light to remind that a part has dropped. Thus, the operator can intervene manually in time, so that production can be restored to normal as soon as possible.

[0035] Optionally, the sensor 420 is a torque sensor 420, which is used to obtain the torque of the motor 310. The torque sensor 420 of the present disclosure itself is a known technology that has been disclosed. For example, the sensor 420 is a torsion angle phase difference sensor 420. When the motor 310 drives the scraper 20 to move in the resin tank 110 through the transmission mechanism 320, if parts fall off, since the gap between the scraper 20 and the resin tank 110 is relatively small, the scraper 20 will drive the fallen parts to squeeze into the resin tank 110. Since the motor 310 is provided with a torque detection range, when it exceeds this range, it is considered that there is a foreign object, and the scraper 20 is controlled to stop moving to remind the disposal of the fallen parts.

[0036] Optionally, the sensor 420 is a current sensor 420, which is used to obtain the current value of the motor 310. The current sensor 420 disclosed in the present invention itself is a known technology that has been disclosed. For example, the sensor 420 is an electromagnetic current transformer or an electronic current transformer.

[0037] The control principle at this time can be based on PID control, that is, proportional-integral-derivative control. Specifically, the controller 410 compares the data read by the current sensor 420 with the expected value, and the controller 410 controls the motor 310 to stop according to the comparison result. Further, the controller 410 is configured to compare the data read by the current sensor 420 with the expected value, and calculate a control output based on the error, and the control output can adjust the current value in the motor drive circuit. By comparing the input signal and the output signal and feeding back, the output torque value of the motor is continuously adjusted to achieve the required torque, and the motor 310 is controlled to stop when the torque detection range is exceeded.

[0038] The part drop detection mechanism 100 disclosed herein determines whether the scraper 20 used for scraping the photocurable material is operating normally by monitoring whether the operating parameters of the motor 310 driving the scraper 20 are within the expected range, thereby determining whether part drop occurs in the resin tank 110, so that part drop can be discovered in time and the equipment can be stopped. In addition, the above monitoring can be achieved without setting up other hardware structures in the resin tank 110 or on the component board, so that the impact or modification on the printing module of the printer is small and the operability is strong.

[0039] In some embodiments, the transmission mechanism 320 includes a first transmission assembly 330 and a second transmission assembly 340, and the first transmission assembly 330 and the second transmission assembly 340 are respectively located on both sides of the resin tank 110 in the second direction. The two ends of the scraper 20 in the second direction are respectively connected to the first transmission assembly 330 and the second transmission assembly 340. The second direction is perpendicular to the first direction. Specifically in FIG. 1, the second direction is the left-right direction.

[0040] 1 to 3 , the resin tank 110 is provided with a first transmission assembly 330 and a second transmission assembly 340 on both sides in the second direction, so that both ends of the scraper 20 are driven synchronously, so that the scraper 20 can be relatively stable when translated along the first direction, thereby ensuring the accuracy of the detection data of the sensor 420.

[0041] In this embodiment, the input end of the first transmission assembly 330 is transmission-connected to the output end of the motor 310, and the second transmission assembly 340 is driven by the first transmission assembly 330. In other alternative embodiments, the input end of the first transmission assembly 330 and the input end of the second transmission assembly 340 are directly connected to the output end of the motor 310.

[0042] In some embodiments, the first transmission assembly 330 includes a first pulley 331 and a second transmission belt 343 wheel 342341332, the first pulley 331 is connected to the output end of the motor 310 by belt transmission, the second transmission belt 343 wheel 342341332 is transmitted to the first pulley 331 through the first transmission belt 333, and one end of the scraper 20 in the second direction is connected to the first transmission belt 333 by transmission.

[0043] The first transmission belt 333 is wound around the second transmission belt 343 wheels 342 341 332 and the first pulley 331 to form a closed loop. The scraper 20 is driven by the first pulley 331 to move along the first direction. The belt transmission and the driving method of the scraper 20 have the advantages of stable transmission and low cost.

[0044] In some embodiments, the dropped component detection mechanism 100 further includes a first guide rail 334 and a first fixed block 335. The first guide rail 334 is arranged along the second direction and fixed to the base 10. The first fixed block 335 is connected to one end of the scraper 20 in the second direction, and the first fixed block 335 is fixed to the first transmission belt 333. The first fixed block 335 and the first guide rail 334 are slidably matched in the second direction.

[0045] When the first transmission belt 333 moves, the first fixed block 335 moves along the first direction, and the first fixed block 335 drives the scraper 20 to move. The first fixed block 335 is slidably matched with the first guide rail 334, so that the first fixed block 335 moves relatively smoothly along the first direction, and thus the scraper 20 also moves relatively smoothly.

[0046] Further, the first fixing block 335 includes a first upper piece 3351 and a first lower piece 3352, wherein the first upper piece 3351 is connected to the scraper 20, and the first lower piece 3352 is slidably matched with the first guide rail 334. The first upper piece 3351 and the first lower piece 3352 are detachably connected and clamp the first transmission belt 333 in the middle. More specifically, the first transmission belt 333 located at the lower layer in the closed loop formed by the first transmission belt 333 is clamped between the first upper piece 3351 and the first lower piece 3352. Through the above design, it is relatively convenient to realize the transmission connection between the first transmission belt 333 and the scraper 20, and it can be easily replaced.

[0047] Furthermore, the first fixing block 335 is connected to the scraper 20 via a first connecting assembly 350. The first connecting assembly 350 includes a first mounting member 351, a first adjusting member 352, and a first adapter member 353, wherein the first mounting member 351 is connected to the first upper member 3351 of the first fixing member. The first adapter member 353 is connected to the scraper 20. The first adapter member 353 is adjustably mounted on the first mounting member 351 along the height direction of the base 10 via the first adjusting member 352.

[0048] Optionally, a first threaded hole portion 3511 is provided on the first mounting member 351. The first adjusting member 352 is threadedly connected to the first threaded hole portion 3511. The first adapter 353 is fixed to the first adjusting member 352. When the first adjusting member 352 rotates, it rises and falls relative to the first mounting member 351, so that the position of one end of the scraper 20 in the height direction of the base 10 can be adjusted, thereby ensuring the effect of scraping the light-curing material. Along the height direction of the base 10, a plurality of first threaded holes 3511 on the first mounting member 351 are arranged at intervals.

[0049] In some embodiments, the second transmission assembly 340 includes a third pulley and a fourth pulley, the third pulley is coaxially connected to the first pulley 331 through a transmission shaft 360, and the fourth pulley and the third pulley are driven by a second transmission belt 343; the other end of the scraper 20 in the second direction is connected to the second transmission belt 343.

[0050] In this embodiment, the second transmission assembly 340 is driven by the first transmission assembly 330 and works synchronously. The second transmission assembly 340 also uses a belt transmission structure to drive the scraper 20, thereby ensuring that both ends of the scraper 20 move synchronously and smoothly.

[0051] In some embodiments, the dropped component detection mechanism 100 further includes a second guide rail 344 and a second fixed block 345. The second guide rail 344 is arranged along the second direction and fixed to the base 10. The second fixed block 345 is connected to the other end of the scraper 20 in the second direction, and the second fixed block 345 is fixed to the second transmission belt 343. The second fixed block 345 and the second guide rail 344 are slidably matched in the second direction.

[0052] When the second transmission belt 343 moves, the second fixed block 345 moves along the second direction, and the second fixed block 345 drives the scraper 20 to move. The second fixed block 345 is slidably matched with the first guide rail 334 at the same time, so that the second fixed block 345 moves relatively stably along the first direction.

[0053] Further, the second fixing block 345 includes a second upper piece 3451 and a second lower piece 3452, wherein the second upper piece 3451 is connected to the scraper 20, and the second lower piece 3452 is slidably matched with the second guide rail 344. The second upper piece 3451 and the second lower piece 3452 are detachably connected and clamp the second transmission belt 343 in the middle. More specifically, the second transmission belt 343 located at the lower layer in the closed loop formed by the second transmission belt 343 is clamped between the second upper piece 3451 and the second lower piece 3452. Through the above design, it is convenient to realize the transmission connection between the second transmission belt 343 and the scraper 20, and it can be easily replaced.

[0054] Further, the second fixing block 345 is connected to the scraper 20 via a second connecting assembly 370. The second connecting assembly 370 includes a second mounting member 371, a second adjusting member 372, and a second adapter 373, wherein the second mounting member 371 is connected to the second upper member 3451 of the second fixing member. The second adapter 373 is connected to the scraper 20. The second adapter 373 is mounted on the second mounting member 371 in an adjustable position along the height direction of the base 10 via the second adjusting member 372.

[0055] Optionally, a second threaded hole portion 3711 is provided on the second mounting member 371. The second adjusting member 372 is threadedly connected to the second threaded hole portion 3711. The second adapter 373 is fixed to the second adjusting member 372. When the second adjusting member 372 rotates, it rises and falls relative to the second mounting member 371, so that the position of the scraper 20 in the height direction of the base 10 can be adjusted, thereby ensuring the effect of scraping the light-curing material. Along the height direction of the base 10, a plurality of second threaded holes 3711 on the second mounting member 371 are arranged at intervals.

[0056] In some embodiments, the transmission shaft 360 is located at one side of the resin tank 110 in the first direction. The connection between the second transmission assembly 340 and the first transmission assembly 330 does not affect the position design of the component plate.

[0057] An embodiment of the second aspect of the present disclosure provides a dropped component detection method, which is applied to the dropped component detection mechanism 100 described above. The dropped component detection method includes:

[0058] S100 , controlling the driving assembly 30 to drive the scraper 20 to reciprocate along a first direction.

[0059] S200 , obtaining the operating parameters of the motor 310 detected by the sensor 420 .

[0060] S300: When it is determined that the operating parameter is outside a preset range, the motor 310 is controlled to stop rotating.

[0061] In some embodiments, the operating parameter is the torque or current value of the motor 310 .

[0062] The part drop detection method disclosed in the present invention monitors the operating parameters of the motor 310 in real time during the process in which the drive assembly 30 drives the scraper 20 to reciprocate and translate along the first direction. By monitoring whether the operating parameters of the motor 310 driving the scraper 20 are within the expected range, it is determined whether the scraper 20 used for scraping the photocurable material is operating normally, thereby determining whether there is a part drop, so that the part drop can be discovered in time and the equipment can be stopped.

[0063] In the present disclosure, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0064] In the present disclosure, unless otherwise clearly specified and limited, if there is a description that a first feature is "on" or "below" a second feature, etc., or the like, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only implementation method.

[0066] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A part drop detection mechanism for a bottom exposure 3D printer, characterized in that: include A base, wherein a resin tank is provided on the base; a scraper, located in the resin tank; A driving assembly, the driving assembly comprising a motor and a transmission mechanism, the transmission mechanism connecting an output end of the motor and the scraper, so that the scraper can reciprocate relative to the resin tank along a first direction to scrape the material in the resin tank flat; and The control system comprises a controller and a sensor, wherein the sensor is configured to detect an operating parameter of the motor, and the controller is configured to control the motor to stop when it is determined that the operating parameter is outside a preset range.

2. The part drop detection mechanism for bottom exposure 3D printer according to claim 1, characterized in that: The sensor is a torque sensor for obtaining the torque of the motor; or, the sensor is a current sensor for obtaining the current value of the motor.

3. The part drop detection mechanism for bottom exposure 3D printer according to claim 1, characterized in that: The transmission mechanism includes a first transmission component and a second transmission component, and the first transmission component and the second transmission component are respectively located on both sides of the resin tank in the second direction; the two ends of the scraper in the second direction are respectively connected to the first transmission component and the second transmission component in transmission; the second direction is perpendicular to the first direction.

4. The part drop detection mechanism for bottom exposure 3D printer according to claim 3, characterized in that: The first transmission assembly includes a first pulley and a second pulley, the first pulley is connected to the output end of the motor by a belt transmission, the second pulley is connected to the first pulley by a first transmission belt, and one end of the scraper in the second direction is connected to the first transmission belt by a belt transmission.

5. The part drop detection mechanism for bottom exposure 3D printer according to claim 4, characterized in that: The dropped parts detection mechanism for the bottom exposure 3D printer also includes a first guide rail and a first fixed block. The first guide rail is arranged along the second direction and fixed to the base. The first fixed block is connected to one end of the scraper in the second direction. The first fixed block is fixed to the first transmission belt. The first fixed block is slidably matched with the first guide rail in the second direction.

6. The part drop detection mechanism for bottom exposure 3D printer according to claim 4, characterized in that: The second transmission assembly includes a third pulley and a fourth pulley. The third pulley is coaxially connected to the first pulley via a transmission shaft, and the fourth pulley and the third pulley are driven by a second transmission belt. The other end of the scraper in the second direction is connected to the second transmission belt.

7. The part drop detection mechanism for bottom exposure 3D printer according to claim 6, characterized in that: The dropped parts detection mechanism for the bottom exposure 3D printer also includes a second guide rail and a second fixed block. The second guide rail is arranged along the second direction and fixed to the base. The second fixed block is connected to the other end of the scraper in the second direction. The second fixed block is fixed to the second transmission belt. The second fixed block is slidably matched with the second guide rail in the second direction.

8. The part drop detection mechanism for bottom exposure 3D printer according to claim 6, characterized in that: The transmission shaft is located at one side of the resin tank in the first direction.

9. A method for detecting dropped parts, characterized in that: Applied to the part drop detection mechanism for a bottom exposure 3D printer as claimed in claim 1, the method comprises: Controlling the driving assembly to drive the scraper to reciprocate in a first direction; Acquiring operating parameters of the motor detected by the sensor; When it is determined that the operating parameter is outside a preset range, the motor is controlled to stop.

10. The method according to claim 9, characterized in that The operating parameter is the torque or current value of the motor.

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