Automatic leveling device and 3D printer

Abstract

The present invention relates to the technical field of 3D printers, and specifically to an automatic leveling device and a 3D printer, comprising a mounting seat, a sleeve being provided on the bottom surface of the mounting seat, a guide rod mechanism and a driving mechanism, wherein the guide rod mechanism comprises a guide rod body, the guide rod body being located inside the sleeve, and the bottom of the guide rod body extending below the sleeve; the driving mechanism being located inside the sleeve, and the driving mechanism being used to control the lifting and lowering of the guide rod mechanism; the automatic leveling device in the present invention is arranged on a nozzle assembly of the 3D printer, and the guide rod mechanism is in contact with multiple points on the upper surface of a printing platform, so that the inclination angle of the upper surface of the printing platform compared to the nozzle assembly can be automatically calculated by software, and then the leveling can be automatically performed by software, so compared with the traditional leveling method, the leveling method of the present invention is simpler and more efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printers, and in particular to an automatic leveling device and a 3D printer. Background Art

[0002] A 3D printer, also known as a three-dimensional printer, is a machine using cumulative manufacturing technology, that is, rapid prototyping technology. It is based on a digital model file and uses special wax materials, powdered metals, or plastics and other adhesive materials to print layers of adhesive materials to create three-dimensional objects.

[0003] In the prior art, a 3D printer generally includes a printing platform, a nozzle assembly, and a control mechanism for driving the nozzle assembly to rise and fall and translate. The printing platform is used to accumulate the material sprayed by the nozzle assembly, while the nozzle assembly is used to spray the printing material downward. In the actual application of a 3D printer, the printing platform must be kept horizontal, or the distance between the bottom of the nozzle assembly and each point on the surface of the printing platform must be kept consistent to ensure printing accuracy. Therefore, in actual operation, the 3D printer must level the printing platform.

[0004] However, the existing leveling device is generally set between the printing platform and the fixed base, specifically at the four corners of the bottom surface of the printing platform. During the specific leveling, the nozzle assembly is moved to different positions on the printing platform, the height difference between the nozzle assembly and the upper surface of the printing platform is observed by the eyes, and then the inclination angle of the printing platform is controlled by manually adjusting the leveling device. This method requires repeated adjustments, and the accuracy of the visual observation is too low, making it difficult to achieve high-precision printing. To this end, we propose an automatic leveling device and a 3D printer to solve the above drawbacks. Summary of the invention

[0005] The object of the present invention is to provide an automatic leveling device and a 3D printer, so as to solve the problems raised in the above-mentioned background technology.

[0006] The present invention is realized through the following technical scheme: an automatic leveling device, comprising a mounting seat, a sleeve being provided on the bottom surface of the mounting seat, and also comprising: a guide rod mechanism, the guide rod mechanism comprising a guide rod body, the guide rod body being located inside the sleeve, and the bottom of the guide rod body extending to the bottom of the sleeve; a driving mechanism, the driving mechanism being located inside the sleeve, and the driving mechanism being used to control the lifting and lowering of the guide rod mechanism; an impact rod and an impact seat, the impact rod being located above the impact seat, and a speed-increasing transmission assembly being further provided between the impact rod and the guide rod mechanism, the speed-increasing transmission assembly being used to generate a linkage between the guide rod mechanism and the impact rod, when the guide rod mechanism moves downward, the impact rod can move upward synchronously, and the movement distance of the impact rod is several times the movement distance of the guide rod mechanism; and a vibration sensor and a controller, the vibration sensor being arranged on the bottom surface of the impact seat, and the signal output end of the vibration sensor being connected to the controller.

[0007] Optionally, the driving mechanism includes a accommodating cylinder and a first electromagnet, the accommodating cylinder is fixedly arranged on the bottom surface of the mounting seat and is located inside the sleeve, and the first electromagnet is arranged on the inner top surface of the accommodating cylinder; the top end of the guide rod body extends into the accommodating cylinder, and the top end of the guide rod body is also provided with a first permanent magnet, and when the first electromagnet is energized, the facing end magnetic poles of the first electromagnet and the first permanent magnet are the same.

[0008] Optionally, the guide rod mechanism also includes a reset sleeve and a reset spring, the reset sleeve is fixedly mounted outside the guide rod body and located below the accommodating cylinder, and the reset spring is movably mounted outside the guide rod body and located inside the reset sleeve; a limiting sleeve is coaxially arranged on the inner bottom surface of the sleeve, the limiting sleeve is mounted outside the guide rod body, a positioning ring is fixedly arranged on the outer peripheral wall of the limiting sleeve, the upper and lower ends of the reset spring are respectively abutted against the inner top surface of the reset sleeve and the positioning ring, and when the first permanent magnet abuts against the first electromagnet, the reset spring is in a compressed state.

[0009] Optionally, an adjustment notch is opened on one side of the sleeve, an adjustment cover is provided on the outer surface of the sleeve at the position of the adjustment notch, the impact rod and the impact seat are both located in the adjustment cover, and the impact seat is fixed to the inner bottom surface of the adjustment cover by a column.

[0010] Optionally, a collision box is provided inside the adjustment cover and above the collision seat, the top and bottom walls of the collision box are provided with through holes, the collision rod is movably inserted into the through holes, an annular flange is fixedly mounted on the outside of the collision rod and inside the collision box, and an impact spring is also provided on the outside of the collision rod and above the annular flange, the two ends of the impact spring are respectively in contact with the inner top surface of the collision box and the annular flange; in a natural state, the impact spring is in a compressed state.

[0011] Optionally, a strip slide is provided on one side wall of the impact box close to the sleeve, and a displacement block is slidably connected in the strip slide, and one end of the displacement block located in the impact box is located below the annular flange, and the end of the displacement block extending outside the impact box is provided with a driven rack, and the length direction of the driven rack is consistent with the length direction of the impact rod; the speed increase transmission assembly includes a main shaft, a first gear, a second gear and an active rack, and the main shaft is distributed in the horizontal direction and is rotatably arranged in the sleeve around its own center axis, the first gear and the second gear are fixedly mounted on the main shaft, and the radius of the second gear is an integer multiple of the radius of the first gear, the active rack is fixedly connected to the guide rod mechanism, the first gear is meshed with the active rack, and the second gear is meshed with the driven rack.

[0012] Optionally, the speed increasing transmission assembly further includes a vertical plate and a retaining frame, wherein the vertical plate is fixedly disposed in the adjusting cover, and the retaining frame is fixedly disposed on the vertical plate, and the main shaft and the retaining frame are rotationally engaged with each other.

[0013] Optionally, a through hole is opened on the side wall of the impact box, and a positioning cover is provided on the outer surface of the impact box at the position of the through hole. A second electromagnet and a movable part are provided in the positioning cover. The movable part is slidably connected to the inner wall of the positioning cover, and a second permanent magnet is provided on the facing surfaces of the movable part and the second electromagnet. A friction plate is provided on the side of the movable part facing the impact box, and a wear-resistant ring is also sleeved on the outer peripheral wall of the annular flange; when the second electromagnet is energized, the facing end magnetic poles of the second electromagnet and the second permanent magnet are the same, and the friction plate and the wear-resistant ring abut against each other.

[0014] Optionally, a guide groove is provided at the bottom end of the guide rod body from bottom to top, a guide cap is provided inside the guide groove, the guide cap is annular in structure, a lifting rod is movably penetrated inside the guide cap, a plug is provided at the bottom end of the lifting rod, a conductive strip is penetrated at the top end of the lifting rod, a limit spring is also sleeved on the outside of the lifting rod, the two ends of the limit spring are respectively fixedly connected to the bottom surface of the guide cap and the plug, and a limit column is also provided on the bottom surface of the guide cap; through holes are symmetrically provided on both side walls of the guide rod body, telescopic blocks are movably provided in the two through holes, a connecting port is penetrated on the telescopic block, a connecting port is penetrated in the connecting block, the connecting block is fixedly connected to the inner wall of the through hole, and the connecting block and the connecting An elastic part is also provided between the inner walls of the opening, an arc-shaped groove is provided at one end of the telescopic block extending into the guide groove, a conductive sheet is fitted in the arc-shaped groove, an oblique groove is provided on the upper surface of one end of the telescopic block extending out of the guide groove, and pushing columns are provided on both sides of the outside of the guide rod body and above the two telescopic blocks; when the upper surface of the plug abuts against the limit column, the two ends of the conductive strip abut against the two conductive sheets respectively, and when the two pushing columns are respectively inserted into the two oblique grooves, the two telescopic blocks move back to back, and the ends of the conductive strip detach from the arc-shaped groove; a power supply for supplying power to the second electromagnet is also provided inside the adjusting cover, and the two conductive sheets are arranged in series with the second electromagnet.

[0015] The present invention further provides a 3D printer, comprising the above-mentioned automatic leveling device, wherein the mounting seat is fixedly arranged on a nozzle assembly of the 3D printer.

[0016] Compared with the prior art, the present invention provides an automatic leveling device and a 3D printer, which have the following beneficial effects:

[0017] 1. The automatic leveling device in the present invention is arranged on the nozzle assembly of the 3D printer. Through the guide rod mechanism and the multi-point contact of the upper surface of the printing platform, the inclination angle of the upper surface of the printing platform compared with the nozzle assembly can be automatically calculated by the software, and then the leveling is automatically performed by the software. Therefore, compared with the traditional leveling method, the leveling method of the present invention is simpler and more efficient;

[0018] 2. The present invention detects vibration signals through a vibration sensor and converts the vibration signals into distance signals, so the height distance between the nozzle assembly and the printing platform can be intuitively and accurately obtained;

[0019] 3. The impact rod and the guide rod mechanism in the present invention are linked by a speed-increasing transmission assembly. When the guide rod mechanism descends a certain distance, the rising distance of the impact rod is several times the descending distance of the guide rod mechanism, which is equivalent to amplifying the movement amplitude of the guide rod mechanism. Therefore, it helps to improve the measurement accuracy, and then helps to improve the leveling accuracy of the printing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a partial cross-sectional view of the present invention;

[0022] Figure 3 It is a schematic diagram of the guide rod mechanism of the present invention;

[0023] Figure 4 It is a cross-sectional view of the initial state of the present invention;

[0024] Figure 5 It is a cross-sectional view of the working state of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the impact box of the present invention;

[0026] Figure 7 This is a schematic diagram of the lifting rod structure of the present invention;

[0027] Figure 8 It is a partial cross-sectional view of the guide rod mechanism of the present invention;

[0028] Fig. 9 This is a cross-sectional view of the adjustment cover structure of the present invention;

[0029] Fig.10 for Figure 2 The corresponding figure at A is enlarged;

[0030] Fig.11 for Figure 3 The corresponding figure at B is enlarged;

[0031] Fig.12 for Figure 4 The corresponding figure at C is enlarged;

[0032] Fig.13 for Figure 4 The corresponding figure at D is enlarged;

[0033] Fig.14 for Fig. 9 The corresponding figure at E is enlarged;

[0034] Fig.15 This is a schematic diagram of the second electromagnet circuit of the present invention.

[0035] In the figure: 100, mounting seat; 101, sleeve; 102, limiting sleeve; 103, positioning ring; 104, adjusting notch; 105, adjusting cover; 200, guide rod mechanism; 201, guide rod body; 202, first permanent magnet; 203, reset sleeve; 204, reset spring; 205, guide groove; 206, guide cap; 207, lifting rod; 208, plug; 209, conductive strip; 210, limiting spring; 211, limiting column; 212, through hole; 213, telescopic block; 214, connecting port; 215, connecting block; 216, elastic member; 217, arc groove; 218, conductive sheet; 219, inclined groove; 220, pushing column; 300, driving mechanism; 301, accommodating cylinder; 302, The first electromagnet; 400, the impact rod; 401, the impact seat; 402, the impact box; 403, the through hole; 404, the annular flange; 405, the impact spring; 406, the strip slide; 407, the displacement block; 408, the driven rack; 409, the penetration; 410, the positioning cover; 411, the second electromagnet; 412, the movable part; 413, the second permanent magnet; 414, the friction plate; 415, the wear-resistant ring; 416, the slide rail; 417, the pulling spring; 500, the speed increasing transmission assembly; 501, the vertical plate; 502, the retaining frame; 503, the main shaft; 504, the first gear; 505, the second gear; 506, the active rack; 600, the vibration sensor; 601, the controller; 700, the power supply. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the prior art, in addition to manual leveling, some 3D printers also have an automatic leveling mechanism between the printing platform and the base, that is, the inclination angle of the printing platform is automatically controlled by an electric device, and the operation of the automatic leveling mechanism is controlled by the system software. When this type of 3D printer is leveled, it is necessary to first measure the inclination angle of the printing plane compared to the nozzle assembly, and then the software can be used to automatically level the printing platform.

[0038] At present, when measuring the inclination angle of the printing platform compared to the nozzle assembly, the commonly used method is to measure the height difference between the four corners of the printing platform and the nozzle assembly, so as to obtain the heights of multiple points on the printing platform, and finally use software to calculate the inclination angle data of the plane composed of these points (i.e., the printing plane) compared to the nozzle assembly.

[0039] The existing measurement method is generally measured by a rangefinder and other equipment, and the rangefinder is generally set on the nozzle assembly and can move synchronously with the nozzle assembly; however, since the size of a 3D printer is usually small, the height difference between the nozzle assembly and the printing platform usually ranges from a few centimeters to tens of centimeters; it is well known that any measuring instrument will have a certain error. When the measured length is smaller, the ratio of the measurement error to the measured length is greater, and it is less conducive to improving the leveling accuracy of the printing platform.

[0040] In order to solve the above problems, the present invention proposes the following technical solutions:

[0041] Embodiment 1

[0042] See also Figure 1 - Fig.15 An automatic leveling device includes a mounting seat 100, a sleeve 101 is provided on the bottom surface of the mounting seat 100, specifically, the sleeve 101 is a cylindrical structure, and the sleeve 101 and the mounting seat 100 are threadedly connected and fixed, the automatic leveling device also includes a guide rod mechanism 200 and a driving mechanism 300, wherein the guide rod mechanism 200 is located inside the sleeve 101, and the bottom of the guide rod mechanism 200 extends below the sleeve 101; the driving mechanism 300 is located in the sleeve 101, and the driving mechanism 300 is used to control the lifting and lowering of the guide rod mechanism 200.

[0043] like Figure 4 As shown, the driving mechanism 300 includes a accommodating cylinder 301 and a first electromagnet 302. The accommodating cylinder 301 is cylindrical, and the bottom end of the accommodating cylinder 301 has a round hole for inserting the guide rod mechanism 200. The accommodating cylinder 301 is fixed to the bottom surface of the mounting seat 100 by bolts and is located inside the sleeve 101. The first electromagnet 302 is arranged on the inner top surface of the accommodating cylinder 301; the guide rod mechanism 200 includes a guide rod body 201, the top end of the guide rod body 201 extends into the accommodating cylinder 301, and the top end of the guide rod body 201 is also provided with a first permanent magnet 202. When the first electromagnet 302 is energized, the magnetic poles of the opposite ends of the first electromagnet 302 and the first permanent magnet 202 are the same; therefore, when the first electromagnet 302 is energized, the guide rod body 201 can be driven to move downward under the action of the magnetic pole repulsion.

[0044] like Figure 8As shown, the guide rod mechanism 200 also includes a reset sleeve 203 and a reset spring 204. The reset sleeve 203 is fixedly sleeved on the outside of the guide rod body 201 and is located below the accommodating tube 301. Specifically, the reset sleeve 203 is threadedly connected and fixed to the guide rod body 201, and the reset sleeve 203 is cylindrical. The reset spring 204 is movably sleeved on the outside of the guide rod body 201 and is located inside the reset sleeve 203; a limiting sleeve 102 is coaxially arranged on the inner bottom surface of the sleeve 101, and the limiting sleeve 102 is welded and fixed to the sleeve 101. The limiting sleeve 102 is sleeved on the outside of the guide rod body 201, and the inner diameter of the limiting sleeve 102 is adapted to the diameter of the guide rod body 201, so as to improve the stability of the guide rod body 201. A positioning sleeve 102 is fixedly sleeved on the outer peripheral wall of the limiting sleeve 102 The upper and lower ends of the reset spring 204 are respectively in contact with the inner top surface of the reset sleeve 203 and the positioning ring 103. When the first permanent magnet 202 is in contact with the first electromagnet 302, the reset spring 204 is in a compressed state. Therefore, the reset spring 204 has a tendency to push the guide rod body 201 upward; specifically, when the first electromagnet 302 is energized, the guide rod body 201 can be driven to descend. Specifically, in the present embodiment, when the guide rod body 201 descends to a position of 5 cm, the repulsive force of the first electromagnet 302 and the elastic force of the reset spring 204 are in a balanced state; when the first electromagnet 302 is de-energized, under the elastic force of the reset spring 204, the guide rod body 201 can immediately rise until the first electromagnet 302 contacts the first permanent magnet 202.

[0045] This embodiment also includes a striking rod 400 and a striking seat 401. Fig. 9 As shown, the impact rod 400 is located above the impact seat 401, and a speed-increasing transmission assembly 500 is also provided between the impact rod 400 and the guide rod mechanism 200. The speed-increasing transmission assembly 500 is used to generate a linkage between the guide rod mechanism 200 and the impact rod 400. When the guide rod mechanism 200 moves downward, the impact rod 400 can move upward synchronously, and the movement distance of the impact rod 400 is several times the movement distance of the guide rod mechanism 200. Specifically, an adjustment notch 104 is provided on one side of the sleeve 101, such as Figure 4 As shown, an adjustment cover 105 is provided on the outer surface of the sleeve 101 and at the position of the adjustment notch 104. The adjustment cover 105 and the sleeve 101 are fixed by bolts. The impact rod 400 and the impact seat 401 are both located in the adjustment cover 105, and the impact seat 401 is fixed to the inner bottom surface of the adjustment cover 105 through a column.

[0046] like Fig. 9As shown, a collision box 402 is provided inside the adjustment cover 105 and above the collision seat 401. The collision box 402 is a rectangular hollow structure. The top wall and the bottom wall of the collision box 402 are provided with through holes 403. The collision rod 400 is movable through the through hole 403. An annular flange 404 is fixedly mounted on the outside of the collision rod 400 and located inside the collision box 402. An impact spring 405 is also provided on the outside of the collision rod 400 and above the annular flange 404. Both ends of the impact spring 405 are respectively in contact with the inner top surface of the collision box 402 and the annular flange 404. In a natural state, the impact spring 405 is in a compressed state. Therefore, the impact spring 405 always has a tendency to push the impact rod 400 to move downward.

[0047] Furthermore, a strip slide 406 is provided on one side wall of the impact box 402 close to the sleeve 101, and the strip slide 406 is distributed vertically. A displacement block 407 is slidably connected in the strip slide 406. Therefore, the displacement block 407 can slide up and down in the strip slide 406. One end of the displacement block 407 located in the impact box 402 is located below the annular flange 404, and the end of the displacement block 407 extending out of the impact box 402 is provided with a driven rack 408, and the length direction of the driven rack 408 is consistent with the length direction of the impact rod 400; therefore, when the driven rack 408 rises, due to the action of the displacement block 407, the annular flange 404 and the impact rod 400 can be pushed to rise synchronously.

[0048] like Fig.10 As shown, the speed increasing transmission assembly 500 includes a vertical plate 501 and a retaining frame 502, a main shaft 503, a first gear 504, a second gear 505 and an active rack 506, wherein the vertical plate 501 is fixedly arranged in the adjustment cover 105, the retaining frame 502 is fixedly arranged on the vertical plate 501, the main shaft 503 and the retaining frame 502 are rotationally matched, and the main shaft 503 is distributed in the horizontal direction and is rotationally arranged around its own central axis in the sleeve 101, the first gear 504 and the second gear 505 are both fixedly sleeved on the main shaft 503, and the radius of the second gear 505 is the whole of the radius of the first gear 504 Several times, specifically in the present embodiment, the radius of the second gear 505 is 5 times the radius of the first gear 504, the active rack 506 is fixedly connected to the guide rod mechanism 200, the first gear 504 is meshed with the active rack 506, and the second gear 505 is meshed with the driven rack 408; specifically, the active rack 506 is fixedly arranged on the outer surface of the reset sleeve 203, therefore, when the reset sleeve 203 descends, under the action of the first gear 504 and the second gear 505, the impact rod 400 can be driven to rise, and the rising distance of the impact rod 400 is 5 times the descending distance of the guide rod body 201.

[0049] In addition, it is worth mentioning that in the initial state, that is, when the first electromagnet 302 abuts against the first permanent magnet 202, the bottom end of the impact rod 400 also abuts against the impact seat 401, and there is a small gap between the upper end of the displacement block 407 and the lower end of the annular flange 404, which is used to avoid collision between the annular flange 404 and the displacement block 407 when the impact rod 400 descends.

[0050] This embodiment also includes a vibration sensor 600 (model TX9) and a controller 601 (using an MCU control unit). Fig. 9 As shown, the vibration sensor 600 is arranged on the bottom surface of the impact seat 401, and the signal output end of the vibration sensor 600 is connected to the controller 601, and the controller 601 is arranged in the adjustment cover 105; because the vibration sensor 600 can detect the vibration signal, when the rising height of the impact rod 400 is different, the impact force is also different, and the vibration signal detected by the vibration sensor 600 is also different, and the impact signals of different forces can correspond to different height distances, and the controller 601 can convert different vibration signals into height signals.

[0051] It should be noted that the function of the speed increasing transmission assembly 500 in this embodiment is to amplify the movement amplitude of the guide rod mechanism 200, thereby amplifying the impact force of different height differences, which is beneficial to improving the measurement accuracy. Therefore, the larger the radius ratio of the first gear 504 and the second gear 505, the more conducive it is to improving the measurement accuracy, thereby improving the leveling accuracy.

[0052] Furthermore, a through hole 409 is provided on the side wall of the impact box 402. Fig. 9 As shown, a positioning cover 410 is provided on the outer surface of the impact box 402 and at the position of the penetration opening 409. The positioning cover 410 is fixedly connected to the inner wall of the adjustment cover 105. A second electromagnet 411 and a movable part 412 are provided in the positioning cover 410. The second electromagnet 411 is fixedly arranged on the inner wall of the positioning cover 410. The movable part 412 is located between the second electromagnet 411 and the impact rod 400. The movable part 412 is slidably connected to the inner wall of the positioning cover 410. The movable part 412 A second permanent magnet 413 is provided on the facing surface of the second electromagnet 411, a friction plate 414 is provided on the side of the movable part 412 facing the impact box 402, and a wear-resistant ring 415 is also sleeved on the outer peripheral wall of the annular flange 404; when the second electromagnet 411 is energized, the facing end magnetic poles of the second electromagnet 411 and the second permanent magnet 413 are the same, and the friction plate 414 and the wear-resistant ring 415 abut against each other, thereby fixing the height position of the annular flange 404 and the impact rod 400.

[0053] The inner top wall and the bottom wall of the positioning cover 410 are both provided with slide rails 416. Fig.14As shown, the upper and lower ends of the movable portion 412 are respectively slidably matched with the two slide rails 416, so that the movable portion 412 is close to or away from the impact rod 400; the movable portion 412 is also provided with a pull spring 417 on the side facing the second electromagnet 411, as shown in FIG. Fig. 9 As shown, one end of the pulling spring 417 away from the movable part 412 is fixedly connected to the inner wall of the positioning cover 410, and when the friction plate 414 abuts against the wear-resistant ring 415, the pulling spring 417 is in a stretched state. Therefore, when the second electromagnet 411 is powered off, under the pulling force of the pulling spring 417, the movable part 412 will move away from the impact rod 400, thereby avoiding hindering the normal movement of the impact rod 400.

[0054] like Fig.13 As shown, a guide groove 205 is provided at the bottom of the guide rod body 201 from bottom to top, and the guide groove 205 is distributed along the axial direction of the guide rod body 201. A guide cap 206 is provided inside the guide groove 205, and the guide cap 206 is threadedly connected in the guide groove 205. The guide cap 206 is annular in structure, and a lifting rod 207 is movably penetrated inside the guide cap 206. A plug 208 is provided at the bottom end of the lifting rod 207, and a conductive strip 209 is penetrated at the top end of the lifting rod 207. The conductive strip 209 is made of copper, and both ends of the conductive strip 209 are in an arc shape. The lifting rod 207 is made of insulating material, and a limit spring 210 is also sleeved on the outside of the lifting rod 207. The two ends of the limit spring 210 are respectively fixedly connected to the bottom surface of the guide cap 206 and the plug 208. A limit column 211 is also provided on the bottom surface of the guide cap 206. When the upper end of the plug 208 abuts against the limit column 211, the limit spring 210 is in a compressed state.

[0055] like Fig.12As shown, through holes 212 are symmetrically provided on the two side walls of the guide rod body 201, and telescopic blocks 213 are movably provided in the two through holes 212. A connecting port 214 is provided on the telescopic block 213, and a connecting block 215 is provided in the connecting port 214. The connecting block 215 is fixedly connected to the inner wall of the through hole 212, and an elastic member 216 is provided between the connecting block 215 and the inner wall of the connecting port 214. The elastic member 216 is made of rubber material and its function is to maintain the position of the telescopic block 213 when the telescopic block 213 is not subjected to other external forces; an arc groove 217 is provided on the end of the telescopic block 213 extending into the guide groove 205, and a conductive sheet 218 is fitted in the arc groove 217. An oblique groove 219 is provided on the upper surface of the end of the telescopic block 213 extending out of the guide groove 205. Pushing posts 220 are provided on both sides of the outside of the guide rod body 201 and above the two telescopic blocks 213 to push The column 220 is fixedly connected to the bottom end of the accommodating tube 301; when the upper surface of the plug 208 abuts against the limiting column 211, the two ends of the conductive strip 209 extend into the two arc grooves 217 and abut against the two conductive sheets 218 respectively; when the two pushing columns 220 are respectively inserted into the two inclined grooves 219, the bottom ends of the pushing columns 220 will abut against the inner surfaces of the inclined grooves 219, so that the two telescopic blocks 213 move in opposite directions, and the ends of the conductive strip 209 are disengaged from the arc grooves 217, and then the lifting rod 207 is lowered under the action of the limiting spring 210; the interior of the adjustment cover 105 is also provided with a power supply 700 for supplying power to the second electromagnet 411, and the two conductive sheets 218 are arranged in series with the second electromagnet 411; therefore, when the two ends of the conductive strip 209 are respectively in contact with the two conductive sheets 218, the second electromagnet 411 is energized, otherwise, the second electromagnet 411 is de-energized.

[0056] To sum up, in the specific implementation process of this embodiment, in the initial state, the first electromagnet 302 is in contact with the first permanent magnet 202, and the bottom end of the impact rod 400 is in contact with the impact seat 401; when the first electromagnet 302 is energized, under the action of the magnetic pole repulsion, the guide rod body 201 descends, and then under the action of the speed increase transmission assembly 500, the impact rod 400 rises until the plug 208 is in contact with the platform to be detected and the upper end of the plug 208 is in contact with the limit column 211, at this time, the two ends of the conductive strip 209 are in contact with the two conductive sheets 218 respectively, the second electromagnet 411 is energized, and the friction sheet 414 is tightly fitted with the wear-resistant ring 415, thereby fixing the position height of the impact rod 400; then, when the first electromagnet 302 is energized, the guide rod body 201 descends under the action of the magnetic pole repulsion, and then under the action of the speed increase transmission assembly 500, the impact rod 400 rises until the plug 208 is in contact with the platform to be detected and the upper end of the plug 208 is in contact with the limit column 211, When the magnet 302 is powered off, the guide rod body 201 rises under the action of the reset spring 204. It should be noted that although the limit spring 210 is in a compressed state at this time, since the two ends of the conductive strip 209 are respectively located in the two arc grooves 217, the plug 208 can still maintain contact with the limit column 211, that is, the second electromagnet 411 is still in a powered state until the bottom ends of the two push columns 220 are inserted into the inclined groove 219, so that the two telescopic blocks 213 move in opposite directions, thereby causing the end of the conductive strip 209 to disengage from the arc groove 217, and the second electromagnet 411 is powered off. Finally, under the action of the impact spring 405, the impact rod 400 drops rapidly and collides with the impact seat 401.

[0057] Embodiment 2

[0058] The embodiment of the present application further provides a 3D printer, including the automatic leveling device in the first embodiment, wherein the mounting seat 100 is fixedly disposed on a nozzle assembly of the 3D printer.

[0059] Specifically, when the guide rod mechanism 200 contacts multiple points on the upper surface of the printing platform, the precise distances between the multiple points and the nozzle assembly can be obtained, so that the tilt angle of the upper surface of the printing platform relative to the nozzle assembly can be calculated using the software built into the controller 601. In addition, an adjustment mechanism (not shown in the figure) capable of automatically adjusting the inclination angle of the printing platform is provided between the printing platform and the base of the 3D printer, and the signal output end of the controller 601 is connected to the adjustment mechanism for controlling the adjustment mechanism to automatically level the printing platform.

[0060] The leveling steps of the 3D printer in this embodiment are as follows:

[0061] The control mechanism on the 3D printer controls the movement of the nozzle assembly and the automatic leveling device so that the bottom end of the automatic leveling device is aligned with one of the corners of the printing platform;

[0062] It should be noted that the control mechanism also needs to control the height of the automatic leveling device so that the distance between the bottom end of the guide rod mechanism 200 and the upper surface of the printing platform does not exceed the lifting range of the guide rod mechanism 200. Specifically, in this embodiment, the distance between the bottom end of the guide rod mechanism 200 and the upper surface of the printing platform is preferably about 3 cm.

[0063] Then, the guide rod mechanism 200 is controlled to descend by the driving mechanism 300 so that the bottom end of the guide rod mechanism 200 abuts against the upper surface of the printing platform. At this time, the impact rod 400 moves upward synchronously.

[0064] Specifically, the driving mechanism 300 controls the guide rod mechanism 200 to descend by energizing the first electromagnet 302. Under the action of the magnetic pole repulsion, the guide rod mechanism 200 descends, and then under the action of the speed increasing transmission assembly 500, the impact rod 400 rises until the plug 208 contacts the printing platform and the upper end of the plug 208 abuts against the limit column 211. At this time, the two ends of the conductive strip 209 are respectively in contact with the two conductive sheets 218, the second electromagnet 411 is energized, and the friction sheet 414 is tightly fitted with the wear-resistant ring 415, thereby fixing the position height of the impact rod 400.

[0065] After the bottom end of the guide rod mechanism 200 contacts the printing platform, it immediately retracts to its original position, the impact rod 400 moves downward and collides with the impact seat 401, and the vibration sensor 600 transmits the impact signal to the controller 601;

[0066] That is, after the upper end of the plug 208 abuts against the limit column 211, the first electromagnet 302 is powered off again. Then, under the action of the reset spring 204, the guide rod mechanism 200 rises again until the bottom ends of the two push columns 220 are inserted into the inclined groove 219, so that the two telescopic blocks 213 move away from each other, and then the end of the conductive strip 209 is disengaged from the arc groove 217. The second electromagnet 411 is powered off, and the friction plate 414 is separated from the wear-resistant ring 415. Finally, under the action of the impact spring 405, the impact rod 400 drops rapidly and collides with the impact seat 401, and the vibration sensor 600 can collect the vibration signal and transmit it to the controller 601.

[0067] Repeat the above steps until the guide rod mechanism 200 contacts the four corners of the printing platform respectively. At this time, the controller 601 can receive the impact signals from four different positions respectively, and convert the signals into height distances. Finally, the software calculates the inclination angle data of the plane composed of these points relative to the nozzle assembly, and compensates for the inclination angle through the software to achieve the leveling purpose.

[0068] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic leveling device, comprising a mounting seat (100), wherein a sleeve (101) is provided on the bottom surface of the mounting seat (100), characterized in that: Also includes: A guide rod mechanism (200), the guide rod mechanism (200) comprising a guide rod body (201), the guide rod body (201) being located inside the sleeve (101), and the bottom of the guide rod body (201) extending below the sleeve (101); the guide rod mechanism (200) further comprising a reset sleeve (203) and a reset spring (204), the reset spring (204) being movably sleeved outside the guide rod body (201) and located inside the reset sleeve (203); A driving mechanism (300), the driving mechanism (300) being located in the sleeve (101), and the driving mechanism (300) being used to control the lifting and lowering of the guide rod mechanism (200); a striking rod (400) and a striking seat (401), wherein the striking rod (400) is located above the striking seat (401), and a speed-increasing transmission assembly (500) is further provided between the striking rod (400) and the guide rod mechanism (200), wherein the speed-increasing transmission assembly (500) is used to generate a linkage between the guide rod mechanism (200) and the striking rod (400), and when the guide rod mechanism (200) moves downward, the striking rod (400) can move upward synchronously, and the movement distance of the striking rod (400) is several times the movement distance of the guide rod mechanism (200); and A vibration sensor (600) and a controller (601), wherein the vibration sensor (600) is arranged on the bottom surface of the impact seat (401), and a signal output end of the vibration sensor (600) is connected to the controller (601); An adjustment notch (104) is provided on one side of the sleeve (101), an adjustment cover (105) is provided on the outer surface of the sleeve (101) at the position of the adjustment notch (104), and the impact rod (400) and the impact seat (401) are both located in the adjustment cover (105); A collision box (402) is provided inside the adjustment cover (105) and above the collision seat (401); an annular flange (404) is fixedly mounted outside the collision rod (400) and inside the collision box (402); an impact spring (405) is also provided outside the collision rod (400) and above the annular flange (404); two ends of the impact spring (405) are respectively in contact with the inner top surface of the collision box (402) and the annular flange (404); in a natural state, the impact spring (405) is in a compressed state; A strip-shaped sliding opening (406) is provided on a side wall of the impact box (402) close to the sleeve (101), and a displacement block (407) is slidably connected in the strip-shaped sliding opening (406). One end of the displacement block (407) located in the impact box (402) is located below the annular flange (404), and one end of the displacement block (407) extending out of the impact box (402) is provided with a driven rack (408); the speed increasing transmission assembly (500) comprises a main shaft (503), a first gear (504), a second gear (505) and an active rack (506). 6), the main shaft (503) is distributed in the horizontal direction and is rotatably arranged around its own central axis in the sleeve (101), the first gear (504) and the second gear (505) are both fixedly mounted on the main shaft (503), and the radius of the second gear (505) is an integer multiple of the radius of the first gear (504), the active rack (506) and the guide rod mechanism (200) are fixedly connected, the first gear (504) is meshed with the active rack (506), and the second gear (505) is meshed with the driven rack (408); The top wall and the bottom wall of the impact box (402) are both provided with through holes (403), and the impact rod (400) is movably inserted into the through holes (403); A through hole (409) is provided on the side wall of the collision box (402), a positioning cover (410) is provided on the outer surface of the collision box (402) and at the position of the through hole (409), a second electromagnet (411) and a movable part (412) are provided in the positioning cover (410), the movable part (412) is slidably connected to the inner wall of the positioning cover (410), and the facing surfaces of the movable part (412) and the second electromagnet (411) are provided A second permanent magnet (413) is provided, a friction plate (414) is provided on one side of the movable portion (412) facing the impact box (402), and a wear-resistant ring (415) is sleeved on the outer peripheral wall of the annular flange (404); when the second electromagnet (411) is energized, the magnetic poles of the second electromagnet (411) and the second permanent magnet (413) facing each other are the same, and the friction plate (414) and the wear-resistant ring (415) are in contact with each other; A pulling spring (417) is also provided on a side of the movable part (412) facing the second electromagnet (411), and one end of the pulling spring (417) away from the movable part (412) is fixedly connected to the inner wall of the positioning cover (410).

2. The automatic leveling device according to claim 1, characterized in that: The driving mechanism (300) comprises a containing tube (301) and a first electromagnet (302); the containing tube (301) is fixedly arranged on the bottom surface of the mounting seat (100) and located inside the sleeve (101); the first electromagnet (302) is arranged on the inner top surface of the containing tube (301); the top end of the guide rod body (201) extends into the containing tube (301), and a first permanent magnet (202) is also arranged on the top end of the guide rod body (201); when the first electromagnet (302) is energized, the magnetic poles of the facing ends of the first electromagnet (302) and the first permanent magnet (202) are the same.

3. The automatic leveling device according to claim 2, characterized in that: The reset sleeve (203) is fixedly sleeved outside the guide rod body (201) and is located below the accommodating tube (301); a limiting sleeve (102) is coaxially arranged on the inner bottom surface of the sleeve (101); the limiting sleeve (102) is sleeved outside the guide rod body (201); a positioning ring (103) is fixedly sleeved on the outer peripheral wall of the limiting sleeve (102); the upper and lower ends of the reset spring (204) are respectively in contact with the inner top surface of the reset sleeve (203) and the positioning ring (103); when the first permanent magnet (202) is in contact with the first electromagnet (302), the reset spring (204) is in a compressed state.

4. The automatic leveling device according to claim 1, characterized in that: The impact seat (401) is fixedly arranged on the inner bottom surface of the adjustment cover (105) via a column.

5. The automatic leveling device according to claim 1, characterized in that: The length direction of the driven rack (408) is consistent with the length direction of the striking rod (400).

6. The automatic leveling device according to claim 1, characterized in that: The speed increasing transmission assembly (500) further comprises a vertical plate (501) and a retaining frame (502); the vertical plate (501) is fixedly arranged in the adjustment cover (105); the retaining frame (502) is fixedly arranged on the vertical plate (501); and the main shaft (503) and the retaining frame (502) are rotationally matched.

7. The automatic leveling device according to claim 6, characterized in that: A guide groove (205) is provided at the bottom end of the guide rod body (201) from bottom to top, a guide cap (206) is provided inside the guide groove (205), the guide cap (206) is annular in structure, a lifting rod (207) is movably penetrated inside the guide cap (206), a plug (208) is provided at the bottom end of the lifting rod (207), a conductive strip (209) is penetrated at the top end of the lifting rod (207), a limit spring (210) is sleeved on the outside of the lifting rod (207), and the two ends of the limit spring (210) are respectively connected to the guide cap (206). 06) and a plug (208) are fixedly connected, and a limiting column (211) is also provided on the bottom surface of the guide cap (206); through holes (212) are symmetrically provided on both side walls of the guide rod body (201), and telescopic blocks (213) are movably provided in the two through holes (212), and a connecting port (214) is provided through the telescopic blocks (213), and a connecting block (215) is provided through the connecting port (214), and the connecting block (215) is fixedly connected to the inner wall of the through hole (212), and the connecting block (215) An elastic member (216) is also provided between the inner wall of the connecting port (214); an arc groove (217) is provided at one end of the telescopic block (213) extending into the guide groove (205); a conductive sheet (218) is fitted in the arc groove (217); an oblique groove (219) is provided on the upper surface of one end of the telescopic block (213) extending out of the guide groove (205); and pushing columns (220) are provided on both sides of the outer side of the guide rod body (201) and above the two telescopic blocks (213); when the upper surface of the plug (208) is in contact with the limiting column (218), the guide rod body (201) is provided with a push column (220); When the two push rods (220) are respectively inserted into the two inclined grooves (219), the two telescopic blocks (213) move in opposite directions, and the ends of the conductive strip (209) are disengaged from the arc groove (217); a power supply (700) for supplying power to the second electromagnet (411) is also provided inside the adjustment cover (105), and the two conductive sheets (218) are both connected in series with the second electromagnet (411).

8. A 3D printer, characterized in that: It comprises the automatic leveling device according to any one of claims 1 to 7, wherein the mounting seat (100) is fixedly arranged on a nozzle assembly of a 3D printer.

Images