Preheating type selective laser sintering equipment capable of working synchronously and efficiently

Abstract

The invention discloses multiple preheating type selective laser sintering equipment capable of working synchronously and efficiently, which comprises a cabinet body, a workbench and a sintering laser transmitter, the workbench is arranged in the cabinet body, the sintering laser transmitter is arranged above the workbench, two sintering bins and three excess stock bins are arranged on the workbench, the sintering bins and the excess stock bins are arranged at intervals, and the sintering bins and the excess stock bins are arranged at intervals. The two sintering bins are clamped among the three excess stock bins; and preheating laser emitters are arranged outside the two sintering bins, and the preheating laser emitters preheat the material powder by reflecting laser through reflectors. Two sintering bins and three excess stock bins are arranged, the sintering bins and the excess stock bins are arranged at intervals, and the two sintering bins are clamped among the three excess stock bins, so that when one sintering bin is used for sintering, material powder is laid in the other sintering bin, preheating laser emitters are arranged outside the two sintering bins, and the material powder is fed into the other sintering bin; and the preheating laser transmitter preheats the material powder by reflecting laser through the reflecting mirror, so that the sintering time is shortened, and the sintering efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of laser sintering, specifically to a preheating type selective laser sintering equipment with multiple units operating synchronously and efficiently. Background Technology

[0002] The basic principle of selective laser sintering (SLS) technology is to utilize the property of powder materials to sinter or melt under laser beam irradiation, and to form solid parts by layer-by-layer deposition under computer control. The specific process is as follows: First, a layer of powder material is uniformly laid on a forming platform; then, under computer control, the laser beam selectively scans according to the cross-sectional contour information of the part's layers; the powder in the scanned area absorbs laser energy, sinters or melts, and bonds together to form the solid cross-section of the current layer, which combines with the already formed portion of the lower layer; after one layer is completed, the forming platform descends by one layer thickness, the powder is re-laid, and the laser scanning sintering process is repeated, in a cycle until the part is completely formed.

[0003] The main technical bottlenecks of the current equipment are reflected in two aspects: Platform Structure and Operational Continuity: Most mainstream equipment adopts a single forming cylinder structure, which includes only one powder supply cylinder and one forming cylinder. After completing one layer of sintering, the equipment needs to pause laser operation to perform powder spreading, at which point the laser emitter is idle. This serial operation mode results in low laser energy utilization, which restricts the overall forming efficiency.

[0004] Lack of powder preheating mechanism: When powder material is fed into the forming area at room temperature, the laser energy required for sintering increases significantly. Existing equipment generally lacks an independent preheating system for the powder, which leads to the need for higher power or slower scanning speed during sintering to compensate for thermal capacity differences. This not only prolongs the sintering time of a single layer, but may also cause warping and deformation of parts due to uneven thermal stress. Summary of the Invention

[0005] The purpose of this invention is to provide a preheating laser selective sintering device with multiple units operating synchronously and efficiently, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a preheating laser selective sintering equipment with multiple units operating synchronously and efficiently, comprising a cabinet, a workbench, and a sintering laser emitter. The cabinet contains a workbench, and a sintering laser emitter for sintering is mounted above the workbench. The workbench is provided with two sintering chambers and three waste material chambers, which are spaced apart. The two sintering chambers are sandwiched between the three waste material chambers, thereby enabling the other sintering chamber to lay material powder while one sintering chamber is sintering. Two crossbeams are fixedly connected to the upper part of the cabinet. A hopper for laying material powder and a sintering laser emitter for sintering are suspended on the crossbeams. The hopper and the sintering laser emitter can slide on the crossbeams. A preheating laser emitter is installed outside the two sintering chambers. The preheating laser emitter preheats the material powder by reflecting the laser light through a mirror.

[0007] Preferably, the cabinet body is provided with cabinet doors.

[0008] Preferably, a funnel-shaped main material bin is provided in the middle of the hopper, and an auxiliary material bin is provided on each side of the main material bin. Several cameras are provided under the two auxiliary material bins to observe the state of the material powder. Scrapers are provided outside the cameras, and two scrapers are fixedly connected to the bottom of the hopper to scrape the material powder in the sintering bin. The main material bin is provided with a discharge port, which is rotatably connected to a feeding plug. The feeding plug is driven by a motor and has several grooves for receiving material powder, so that the material powder falls when the feeding plug rotates. The auxiliary material hopper is also equipped with a discharge port, and an auxiliary material door is provided at the discharge port. The auxiliary material door is slidably connected to the hopper, with one end extending out of the hopper and fixedly connected to at least one door support. The door support is fixedly connected to the output end of an electric push rod, which is fixed to the outside of the hopper so that when the camera observes that the material powder in the sintering hopper is insufficient, the auxiliary material door can be opened to replenish the material powder in the sintering hopper.

[0009] Preferably, the preheating laser emitter is fixed on the preheating bracket, which is fixed on the worktable. One end of a mirror support rod is fixedly connected to both sides of the reflector, and the other ends of the two mirror support rods are slidably connected in the preheating bracket. One of the mirror support rods is threadedly connected to a mirror screw, which is rotatably connected in the preheating bracket and driven by a motor so that the reflector can be retracted when the sintering laser emitter moves over for sintering to avoid interference.

[0010] Preferably, the sintering laser emitter is fixedly connected to the sintering slider, which can slide horizontally on the translation rod. A translation gear is rotatably connected to the lower side of both ends of the translation rod. The translation gear meshes with the translation rack, which is fixed to the crossbeam. One of the translation gears is driven by a motor. One end of the linkage bracket is also fixedly connected to the translation rod, and the other end of the linkage bracket is fixedly connected to the linkage rack.

[0011] Preferably, the sintering slider is rotatably connected to an internal gear, which meshes with a rack mounted on a translation rod. The internal gear is driven by a motor to control the sliding of the sintering slider.

[0012] Preferably, a sintering platform is slidably connected in the sintering chamber, and the sintering platform is fixedly connected to the upper end of the platform screw, with the platform screw threadedly connected to a nut sprocket; The linkage rack can mesh with the linkage gear. The linkage gear drives the active bevel gear to rotate in one direction through the snap teeth. The active bevel gear meshes with the driven bevel gear. The driven bevel gear is fixedly connected to one end of the linkage shaft. The other end of the linkage shaft is fixedly connected to the active sprocket. The active sprocket and the nut sprocket mesh with the same chain. The active sprocket, linkage shaft, driven bevel gear, and active bevel gear are all rotatably connected in the cabinet. The linkage gear is hinged with several movable clips by torsion springs, and several fixed clips are fixedly connected to the active bevel gear. The movable clips and fixed clips are engaged in one direction, so that the linkage rack can only drive the sintering platform to descend. Each time the sintering laser emitter is removed, the linkage rack drives the sintering platform to descend by the height of one layer of material powder.

[0013] Preferably, one end of two suspension brackets is fixedly connected to the hopper, and the other end of the suspension bracket is rotatably connected to a suspension gear. The suspension gear meshes with a suspension rack, and the suspension rack is fixedly connected to a crossbeam. One of the suspension gears is fixedly connected to the output end of a motor, and the motor is fixedly connected to the suspension bracket.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention sets up two sintering chambers and three waste material chambers, with the sintering chambers and waste material chambers spaced apart, and the two sintering chambers sandwiched between the three waste material chambers. This allows one sintering chamber to be sintering while the other sintering chamber is laying material powder. At the same time, a preheating laser emitter is set outside the two sintering chambers. The preheating laser emitter preheats the material powder by reflecting the laser through a mirror, so as to reduce the sintering time and improve the sintering efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a structural schematic diagram of the front wall of the cabinet of the present invention cut open; Figure 3 This is a schematic diagram of the mirror screw of the present invention; Figure 4 This is a schematic diagram of the internal structure of the workbench of the present invention; Figure 5 for Figure 4 A magnified view of section B; Figure 6 for Figure 4 A magnified view of a portion at point C; Figure 7 This is a schematic diagram of the interior of the sintering slider of the present invention; Figure 8 This is a schematic diagram of the structure of the cabinet body after the rear wall has been cut open. Figure 9This is a schematic diagram of the top section of the cabinet body of the present invention; Figure 10 This is a structural schematic diagram of the cabinet body of the present invention cut open at another angle from the top; Figure 11 for Figure 10 A magnified view of a portion at point D; Figure 12 This is a structural diagram of the cabinet body of the present invention cut open at the third angle of the top; Figure 13 for Figure 12 A magnified view of part A; Figure 14 This is a structural diagram of the cabinet body of the present invention cut open at the fourth angle of the top.

[0016] In the diagram: 1. Cabinet; 101. Cabinet door; 2. Workbench; 201. Sintering bin; 202. Waste material bin; 3. Hopper; 301. Main material bin; 302. Auxiliary material bin; 303. Discharge plug; 304. Plug groove; 305. Scraper; 306. Camera; 307. Auxiliary material door; 308. Door support; 4. Preheating laser emitter; 401. Reflector; 402. Mirror support rod; 403. Mirror screw; 404. Preheating bracket; 5. Sintering laser emitter; 501. Sintering slider; 50 2. Slider internal gear; 503. Translation rod; 504. Translation gear; 505. Translation rack; 506. Linkage bracket; 507. Linkage rack; 508. Linkage gear; 509. Movable clip; 6. Sintering platform; 601. Platform screw; 602. Nut sprocket; 603. Drive sprocket; 604. Linkage shaft; 605. Driven bevel gear; 606. Driven bevel gear; 607. Fixing clip; 7. Crossbeam; 701. Suspension rack; 702. Suspension gear; 703. Suspension bracket. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-14To address the issues of platform structure and operational continuity, as well as the lack of a powder preheating mechanism, a solution is implemented by setting up two sintering chambers 201 and three waste material chambers 202, with the sintering chambers 201 and waste material chambers 202 spaced apart. The two sintering chambers 201 are sandwiched between the three waste material chambers 202. This allows one sintering chamber 201 to be sintering while the other sintering chamber 201 is laying material powder. Simultaneously, a preheating laser emitter 4 is installed outside the two sintering chambers 201. The preheating laser emitter 4 uses a reflector 401 to reflect laser light to preheat the material powder, thereby reducing sintering time and improving sintering efficiency. This invention provides a technical solution: a preheating laser selective sintering equipment with multiple units operating synchronously and efficiently, comprising a cabinet 1, a workbench 2, and a sintering laser emitter 5. The workbench 2 is disposed in the cabinet 1, and the sintering laser emitter 5 for sintering is disposed above the workbench 2. The workbench 2 is provided with two sintering chambers 201 and three waste material chambers 202, which are spaced apart. The two sintering chambers 201 are sandwiched between the three waste material chambers 202, thereby enabling the other sintering chambers 201 to lay material powder while one sintering chamber 201 is sintering. The cabinet 1 is provided with a cabinet door 101. Two crossbeams 7 are fixedly connected to the upper part of the cabinet 1. A hopper 3 for laying material powder and a sintering laser emitter 5 for sintering are suspended on the crossbeams 7. The hopper 3 and the sintering laser emitter 5 can slide on the crossbeams 7. A preheating laser emitter 4 is set outside the two sintering chambers 201. The preheating laser emitter 4 preheats the material powder by reflecting laser light through a reflector 401. In this application, electrical components such as motor cylinder push rods and optical components such as laser emitter reflectors are all of existing models. During sintering, when the sintering laser emitter 5 is sintering one sintering chamber 201, the hopper 3 lays material powder in the other sintering chamber 201. After laying, the preheating laser emitter 4 is used to preheat the material powder until the sintering laser emitter 5 moves over to sinter the sintering chamber 201. The above steps are repeated for the sintered sintering chamber 201. The preheating laser emitter 4 is selected to prevent the material powder from sintering, and the reflector 401 can be a concave lens that can scatter the laser. The material powder in the waste bin 202 is recovered using an existing suction tube.

[0019] To facilitate the replenishment of material powder to the sintering bin 201, a funnel-shaped main material bin 301 is provided in the middle of the hopper 3. An auxiliary material bin 302 is provided on each side of the main material bin 301. The auxiliary material bins 302 are fed through doors located on their sides. Several cameras 306 are installed below the two auxiliary material bins 302 to observe the state of the material powder. Scrapers 305 are installed outside the cameras 306, and two scrapers 305 are fixedly connected to the bottom of the hopper 3 to level the material powder in the sintering bin 201. A discharge port is provided below the main material bin 301, and the discharge port is rotatably connected to a feed plug 303. The feed plug 303 is electrically controlled... Driven by a motor, the feeding plug 303 is equipped with several grooves 304 for receiving material powder, so that the material powder falls when the feeding plug 303 rotates. The auxiliary material bin 302 also has a discharge port with an auxiliary material door 307. The auxiliary material door 307 is slidably connected to the hopper 3, with one end extending out of the hopper 3 and fixedly connected to at least one door support 308. The door support 308 is fixedly connected to the output end of an electric push rod, which is fixed to the outside of the hopper 3. This allows the auxiliary material door 307 to be opened to replenish the sintering bin 201 when the camera observes insufficient material powder. Two suspension brackets 703 are fixedly connected to one end of the hopper 3. The other end of the suspension brackets 703 is rotatably connected to a suspension gear 702, which meshes with a suspension rack 701. The suspension rack 701 is fixedly connected to a crossbeam 7. One of the suspension gears 702 is fixedly connected to the output end of a motor, which is fixed to the suspension bracket 703. When it is necessary to lay material powder, the motor of the suspension gear 702 is started. The motor drives the suspension gear 702 to rotate, and the suspension gear 702 moves on the suspension rack 701. The suspension gear 702 drives the suspension frame 703 to move, and the suspension frame 703 drives the hopper 3 to move, so that the hopper 3 moves to the sintering chamber 201 where material needs to be added, and continues to move. During this process, the motor of the feed plug 303 is started, and the motor drives the feed plug 303 to rotate, so that the material powder enters the plug groove 304 and falls down with the rotation. At the same time, the material powder is used to... The camera 306 observes the powder falling. When insufficient powder is observed, the auxiliary material door 307 of the corresponding auxiliary material bin 302 is activated, and the electric push rod is activated. The electric push rod drives the auxiliary material door 307 to open, allowing the material powder in the auxiliary material bin 302 to fall and replenish the sintering bin 201. After the feeding is completed, the main material bin 301 and the auxiliary material bin 302 are closed. The hopper 3 continues to move, and the hopper 3 drives the scraper 305 to move. The scraper 305 scrapes the material powder flat, and the excess material powder is scraped into the surplus material bin 202.

[0020] To improve sintering efficiency, the preheating laser emitter 4 is fixed on the preheating bracket 404, which is fixed on the worktable 2. One end of a mirror support rod 402 is fixedly connected to both sides of the reflector 401. The other ends of both mirror support rods 402 are slidably connected in the preheating bracket 404. One of the mirror support rods 402 is threadedly connected to a mirror screw 403, which is rotatably connected in the preheating bracket 404 and driven by a motor. This allows the reflector 401 to be retracted when the sintering laser emitter 5 moves over for sintering, preventing interference. In use, the motor is started, driving the mirror screw 403 to rotate. The rotation of the mirror screw 403 moves the mirror support rod 402, which in turn moves the reflector 401. When the reflector 401 extends above the sintering chamber 201, the preheating laser emitter 4 is activated to preheat the sintering chamber 201. When the reflector 401 retracts, the preheating laser emitter 4 is turned off.

[0021] To facilitate the movement of the sintering laser emitter 5, the sintering laser emitter 5 is fixedly connected to the sintering slider 501. The sintering slider 501 can slide horizontally on the translation rod 503. A translation gear 504 is rotatably connected to the lower side of both ends of the translation rod 503. The translation gear 504 meshes with the translation rack 505. The translation rack 505 is fixed on the crossbeam 7. One of the translation gears 504 is driven by a motor. One end of the linkage bracket 506 is also fixedly connected to the translation rod 503. The other end of the linkage bracket 506 is fixedly connected to the linkage rack 507. An internal slider gear 502 is rotatably connected in the sintering slider 501. The internal slider gear 502 meshes with the rack set on the translation rod 503. The internal slider gear 502 is driven by a motor to control the sliding of the sintering slider 501. When movement is required, the motor of the translation gear 504 is started, and the motor drives the translation gear 504 to rotate. The translation gear 504 moves on the translation rack 505, and the translation gear 504 drives the translation rod 503 to slide on the crossbeam 7. The translation rod 503 drives the sintering slider 501 to move, and the sintering slider 501 drives the sintering laser emitter 5 to move. When movement on the translation rod 503 is required, the motor of the slider internal gear 502 is started, and the motor drives the slider internal gear 502 to rotate. The slider internal gear 502 drives the sintering slider 501 to slide on the translation rod 503. During the movement of the translation rod 503, the translation rod 503 drives the linkage bracket 506 to move, the linkage bracket 506 drives the linkage rack 507 to move, and the linkage rack 507 drives the linkage gear 508 to rotate. When the sintering laser emitter 5 completes sintering, the translation rod 503 drives the sintering laser emitter 5 to move away. At this time, the linkage gear 508 drives the sintering platform 6 to descend by the thickness of one sintering layer. When the sintering laser emitter 5 moves over to prepare for sintering, the linkage gear 508 rotates, but cannot drive the sintering platform 6 to move.

[0022] To facilitate the application of material powder, a sintering platform 6 is slidably connected in the sintering chamber 201. The sintering platform 6 is fixedly connected to the upper end of the platform screw 601. The platform screw 601 is threadedly connected to the nut sprocket 602. Slots are provided in the cabinet 1 and the workbench 2 to accommodate the platform screw 601 descending and inserting into them. The linkage rack 507 can mesh with the linkage gear 508. The linkage gear 508 drives the active bevel gear 606 to rotate unidirectionally through the snap teeth. The active bevel gear 606 meshes with the driven bevel gear 605. The driven bevel gear 605 is fixedly connected to one end of the linkage shaft 604, and the other end of the linkage shaft 604 is fixed. The drive sprocket 603 is connected to the nut sprocket 602, which meshes with the same chain. The drive sprocket 603, the linkage shaft 604, the driven bevel gear 605, and the drive bevel gear 606 are all rotatably connected in the cabinet 1. Several movable clips 509 are hinged to the linkage gear 508 by torsion springs. Several fixed clips 607 are fixedly connected to the drive bevel gear 606. The movable clips 509 and the fixed clips 607 are engaged in one direction, so that the linkage rack 507 can only drive the sintering platform 6 to descend. Each time the sintering laser emitter 5 is removed, the linkage rack 507 drives the sintering platform 6 to descend by the height of one layer of material powder. When the sintering laser emitter 5 completes sintering and leaves, the linkage gear 508 drives the movable card 509 to move. At this time, the movable card 509 is engaged with the fixed card 607. Therefore, the linkage gear 508 drives the active bevel gear 606 to rotate, which in turn drives the driven bevel gear 605 to rotate. The driven bevel gear 605 drives the linkage shaft 604 to rotate, which in turn drives the active sprocket 603 to rotate. The active sprocket 603 drives the nut sprocket 602 to rotate synchronously via a chain. The rotation of the nut sprocket 602 causes the platform screw 601 to descend, which in turn causes the sintering platform 6 to descend. When the sintering laser emitter 5 moves over to prepare for sintering, the linkage gear 508 rotates, which drives the movable card 509 to move. At this time, the movable card 509 is unlocked from the fixed card 607 and will be squeezed back. The active bevel gear 606 does not rotate due to the friction between the linkage shaft 604 and the cabinet 1. Therefore, the sintering platform 6 does not move at this time.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently, comprising a cabinet (1), a workbench (2), and a sintering laser emitter (5), wherein the workbench (2) is disposed in the cabinet (1), and a sintering laser emitter (5) for sintering is disposed above the workbench (2), characterized in that: The workbench (2) is provided with two sintering bins (201) and three waste bins (202). The sintering bins (201) and waste bins (202) are spaced apart. The two sintering bins (201) are sandwiched between the three waste bins (202), so that when one sintering bin (201) is sintering, the other sintering bin (201) is spreading material powder. Two crossbeams (7) are fixedly connected to the upper part of the cabinet (1). A hopper (3) for laying material powder and a sintering laser emitter (5) for sintering are suspended on the crossbeams (7). The hopper (3) and the sintering laser emitter (5) can slide on the crossbeams (7). A preheating laser emitter (4) is provided outside the two sintering chambers (201). The preheating laser emitter (4) preheats the material powder by reflecting the laser through a mirror (401).

2. The preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 1, characterized in that: The cabinet (1) is provided with a cabinet door (101).

3. The preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 1, characterized in that: The hopper (3) is provided with a funnel-shaped main material bin (301) in the middle. A secondary material bin (302) is provided on each side of the main material bin (301). Several cameras (306) are provided under the two secondary material bins (302) to observe the state of the material powder. Scrapers (305) are provided outside the cameras (306). Two scrapers (305) are fixedly connected to the bottom of the hopper (3) to scrape the material powder in the sintering bin (201). The main material bin (301) is provided with a discharge port, which is rotatably connected to a feeding plug (303). The feeding plug (303) is driven by a motor. The feeding plug (303) is provided with several plug grooves (304) for receiving material powder, so that the material powder falls when the feeding plug (303) rotates. The auxiliary material hopper (302) is also provided with a discharge port, and an auxiliary material door (307) is provided at the discharge port. The auxiliary material door (307) is slidably connected in the hopper (3), with one end extending out of the hopper (3) and fixedly connected to at least one door support (308). The door support (308) is fixedly connected to the output end of the electric push rod. The electric push rod is fixed on the outside of the hopper (3) so that when the camera observes that the material powder in the sintering hopper (201) is insufficient, the auxiliary material door (307) can be opened to replenish the material powder in the sintering hopper (201).

4. The preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 1, characterized in that: The preheating laser emitter (4) is fixed on the preheating bracket (404), which is fixed on the worktable (2). One end of a mirror support rod (402) is fixedly connected to both sides of the reflector (401). The other ends of the two mirror support rods (402) are slidably connected in the preheating bracket (404). One of the mirror support rods (402) is threadedly connected to a mirror screw (403), which is rotatably connected in the preheating bracket (404). It is driven by a motor so that the reflector (401) can be retracted when the sintering laser emitter (5) moves over for sintering to avoid interference.

5. The preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 1, characterized in that: The sintering laser emitter (5) is fixedly connected to the sintering slider (501). The sintering slider (501) can slide horizontally on the translation rod (503). A translation gear (504) is rotatably connected to the lower side of both ends of the translation rod (503). The translation gear (504) meshes with the translation rack (505). The translation rack (505) is fixed on the crossbeam (7). One of the translation gears (504) is driven by a motor. One end of the linkage bracket (506) is also fixedly connected to the translation rod (503). The other end of the linkage bracket (506) is fixedly connected to the linkage rack (507).

6. A preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 5, characterized in that: The sintering slider (501) is rotatably connected to an internal gear (502), which meshes with a rack on a translation rod (503). The internal gear (502) is driven by a motor to control the sliding of the sintering slider (501).

7. A preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 5, characterized in that: The sintering chamber (201) is slidably connected to the sintering platform (6), which is fixedly connected to the upper end of the platform screw (601). The platform screw (601) is threadedly connected to the nut sprocket (602). The linkage rack (507) can mesh with the linkage gear (508). The linkage gear (508) drives the active bevel gear (606) to rotate in one direction through the snap teeth. The active bevel gear (606) meshes with the driven bevel gear (605). The driven bevel gear (605) is fixedly connected to one end of the linkage shaft (604). The other end of the linkage shaft (604) is fixedly connected to the active sprocket (603). The active sprocket (603) and the nut sprocket (602) mesh with the same chain. The active sprocket (603), linkage shaft (604), driven bevel gear (605), and active bevel gear (606) are all rotatably connected in the cabinet (1). The linkage gear (508) is hinged with several movable clips (509) by a torsion spring, and several fixed clips (607) are fixedly connected to the active bevel gear (606). The movable clips (509) and the fixed clips (607) are engaged in one direction, so that the linkage rack (507) can only drive the sintering platform (6) to descend. Each time the sintering laser emitter (5) is removed, the linkage rack (507) drives the sintering platform (6) to descend by the height of one layer of material powder.

8. A preheating-type selective laser sintering equipment with multiple units operating synchronously and efficiently according to claim 1, characterized in that: The hopper (3) is fixedly connected to one end of two suspension brackets (703), and the other end of the suspension bracket (703) is rotatably connected to a suspension gear (702). The suspension gear (702) meshes with a suspension rack (701), and the suspension rack (701) is fixedly connected to the crossbeam (7). One of the suspension gears (702) is fixedly connected to the output end of the motor, and the motor is fixed on the suspension bracket (703).

Images