An engineering model 3D printing device

Abstract

The present invention relates to the technical field of 3D printing, and particularly to a 3D printing device for engineering models, comprising: a support frame, a feeding device arranged outside the support frame, a printing component installed on the upper side inside the support frame, and a placement component installed on the inner side of the support frame. The placement component includes a bottom plate, and a magnetic hot plate component is arranged on the bottom plate; the magnetic hot plate component includes a magnetic plate and a heating plate. The heating plate is arranged on the upper side of the bottom plate, and the magnetic plate is arranged on the upper side of the heating plate through a sliding component; the sliding component includes a plurality of sealing strips, and the plurality of sealing strips are fixedly connected in parallel to the bottom surface of the magnetic plate. A plurality of sealed heating spaces are formed between two adjacent sealing strips; a contraction component is arranged inside the sealed heating space. The present invention can separate the printed object by bending the magnetic plate after printing is completed, so that the magnetic plate does not need to be disassembled, facilitating the removal of the printed object.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a 3D printing device for engineering models. Background Art

[0002] A 3D printing device uses computer-aided design software to convert a digital model into a physical model and rapidly manufactures an object by the method of stacking materials layer by layer. Among them, 3D printing devices for engineering models have extensive applications in multiple fields such as aerospace, transportation, electronic products, and industrial design.

[0003] The patent with the publication number CN112959657B discloses a 3D printer, including a chassis. A plurality of vertical frames are provided on the top of the chassis. A top frame is provided between any two of the vertical frames. A cross beam is provided between the top frames through a Y-axis controller. The printing device includes a booster. A raw material pipe is slidably connected inside the booster. A heating cavity is provided at the bottom of the booster. A flow cavity is communicated with the bottom of the heating cavity. A temperature sensor is provided inside the flow cavity to detect the internal temperature thereof. By controlling the current value of the electromagnet, the gap between the heat-resistant magnetic ball and the nozzle is changed, so that the required shape, volume and size can be obtained after cooling, and the printing effect is good and the printing accuracy is high.

[0004] When the current 3D printing device is printing, the material is generally stacked on the printing plate. However, it is difficult to take down the material printed on the printing plate. Therefore, a magnetic hot plate convenient for material taking is selected to be installed on the printing plate. However, when taking the material, the magnetic hot plate usually needs to be completely removed and then bent to separate the printed object from the magnetic hot plate. Such a method cannot separate large-volume printed objects, resulting in difficult material taking and reducing the material taking speed. Summary of the Invention

[0005] The purpose of the present invention is to solve the drawbacks in the prior art that large-volume printed objects cannot be separated, resulting in difficult material taking and reducing the material taking speed, and to propose a 3D printing device for engineering models.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A 3D printing device for engineering models includes: a support frame, a feeding device arranged outside the support frame, a printing component installed on the upper side inside the support frame, and a placing component installed on the inner side of the support frame. The placing component includes a bottom plate, and a magnetic hot plate component is arranged on the bottom plate;

[0008] The magnetic hot plate component includes a magnetic plate and a heating plate. The heating plate is arranged on the upper side of the bottom plate, and the magnetic plate is arranged on the upper side of the heating plate through a sliding component;

[0009] The sliding component includes a plurality of sealing strips, and the plurality of sealing strips are fixedly connected in parallel to the bottom surface of the magnetic plate. A plurality of sealed heating spaces are formed between two adjacent sealing strips;

[0010] A contraction component is arranged inside the sealed heating space. The contraction component is used to pull two adjacent sealing strips closer, driving the magnetic plate to bend upward. The contraction component includes two connecting pipes and an energized solenoid. The two connecting pipes are respectively fixedly connected to one side of the two sealing strips close to each other, and the energized solenoid is fixedly connected between the two connecting pipes.

[0011] Preferably, the placement component further includes a driving motor, a driving rod, and a bracket. The driving motor is fixedly installed at the inner bottom of the support frame. The driving rod is fixedly connected to the output end of the driving motor. The bracket is installed on the driving rod. The driving rod is used to drive the bracket to move up and down, and the bottom plate is fixedly connected to the bracket.

[0012] Preferably, the printing component includes a driving carriage, a heating module, and a nozzle end. The driving carriage is fixedly installed at the upper end inside the support frame. The heating module is slidably arranged on the driving carriage, and the nozzle end is fixedly connected below the heating module.

[0013] Preferably, the sliding component includes a plurality of slide rails and a plurality of sliders. The plurality of slide rails are fixedly connected in parallel to the heating plate. The plurality of sealing strips are arranged perpendicular to the slide rails. The plurality of sliders are fixedly connected to the plurality of sealing strips and are respectively slidably arranged inside the plurality of slide rails.

[0014] Preferably, the part of the sealing strip located between two slide rails bulges outwards. A sealed heating space is formed between two adjacent slide rails and two adjacent sealing strips. The plurality of sealed heating spaces are distributed in a matrix between the magnetic plate and the heating plate.

[0015] Preferably, the upper end of the sealing strip is fixedly connected to the magnetic plate and is elastically arranged at the upper end for stretching deformation of the magnetic plate.

[0016] Preferably, an energizing component is arranged below the middle of the sliding component. The energizing component is used to limit the position of the sliding component on the heating plate and simultaneously energize the energized solenoid.

[0017] Preferably, the energizing component includes a limit seat, an insertion block, and a turning handle. The limit seat is fixedly connected to the middle of the sealing strip in the middle of the sliding component. Connecting ports are opened in the middle of the bottom plate and the heating plate. The insertion block is slidably arranged inside the connecting port, and the turning handle is fixedly connected to the side of the insertion block.

[0018] Preferably, an elastic strip is provided between the two connecting tubes, and the elastic strip is fixedly connected to the upper sides of the two connecting tubes to limit the distance between the two connecting tubes.

[0019] Preferably, the elastic strip is made of an elastic material and has a semicircular cross section. A heat conduction port is provided in the middle of the elastic strip, and when bent upward, the cross section is V-shaped.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. After printing is completed, power is supplied to the inside of the energized solenoid, and the energized solenoid is contracted by a strong current, so that the sealing strip is pulled by the energized solenoid, and the sealing strip is pulled closer, and the sealing strip pulls and bends the magnetic plate, and a tensile force is generated between the deformed magnetic plate and the shaped printed object, so that the magnetic plate is separated from the printed object, and it is convenient to quickly separate the printed object from the magnetic plate. After printing is completed, the present invention can separate the printed object by bending the magnetic plate, so that the magnetic plate does not need to be disassembled, which facilitates the removal of the printed object;

[0022] 2. The magnetic plate has a certain elasticity, and the thickness of the part of the magnetic plate that needs to be bent is thinner than the part that is fixedly connected to the sealing strip. Under normal circumstances, the magnetic plate is supported and shaped by multiple sealing strips, so that the magnetic plate has sufficient support strength to support the printed object, which meets the overall deformation and support requirements of the magnetic plate;

[0023] 3. The original magnetic hot plate directly transfers heat to the magnetic plate, which will cause rapid heat loss and consume more energy. Through high-temperature resistant sealing strips and slide rails, multiple sealed heating spaces are formed between the magnetic plate and the heating plate. The sealed heating space is used to store heat, reduce heat loss, and thus reduce energy consumption;

[0024] 4. The energized solenoid generates heat, which increases the temperature inside the sealed heating space and heats the part where the printed object and the magnetic plate are stuck together, so that the contact part melts, making it easier to separate the printed object from the magnetic plate during the subsequent folding and bending of the magnetic plate.

[0025] 5. During the contraction of the energized solenoid, the magnetic plate will bend, causing the shape of the magnetic plate to change. In order to avoid the irregular contraction of the magnetic plate causing a large change in position, the center position of the magnetic plate is fixed by the energized component, so that during the contraction of the magnetic plate, the magnetic plates on both sides begin to contract toward the middle, thereby ensuring that the printed object above the magnetic plate will not tilt significantly and ensuring the stability of the printed object;

[0026] 6. When the energized solenoid is energized, the energized solenoid contracts, thereby driving the connecting pipes on both sides to approach each other. During the process of the connecting pipes approaching each other, the elastic strip will bend upward. During the bending process of the elastic strip, it can support the bent magnetic plate, thereby strengthening the bending of the magnetic plate and ensuring the separation between the magnetic plate and the printed object. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 6 is a front structural schematic diagram of an engineering model 3D printing device proposed by the present invention;

[0028] Figure 2 FIG. 10 is a rear structural schematic diagram of an engineering model 3D printing device proposed by the present invention;

[0029] Figure 3 FIG. 14 is a schematic diagram of the support frame structure of an engineering model 3D printing device proposed by the present invention;

[0030] Figure 4 FIG. 18 is a front structural schematic diagram of the magnetic hot plate assembly of an engineering model 3D printing device proposed by the present invention;

[0031] Figure 5 FIG. 22 is a bottom schematic diagram of the unfolded structure of the magnetic hot plate assembly of an engineering model 3D printing device proposed by the present invention;

[0032] Figure 6 FIG. 26 is a front schematic diagram of the unfolded structure of the magnetic hot plate assembly of an engineering model 3D printing device proposed by the present invention;

[0033] Figure 7 FIG. 30 is a sectional structural schematic diagram of the magnetic hot plate assembly of an engineering model 3D printing device proposed by the present invention;

[0034] Figure 8 FIG. 34 is a schematic diagram of the sliding component structure of an engineering model 3D printing device proposed by the present invention;

[0035] Figure 9 FIG. 38 is a schematic diagram of the sealing strip structure of an engineering model 3D printing device proposed by the present invention;

[0036] Figure 10 FIG. 42 is a schematic diagram of the contraction component structure of an engineering model 3D printing device proposed by the present invention;

[0037] Figure 11 FIG. 46 is a diagram showing the state change after the engineering model 3D printing device proposed by the present invention is energized.

[0038] In the figure: 1. Support frame; 2. Feeding device; 3. Printing component; 31. Driving carriage; 32. Heating module; 33. Nozzle end; 4. Placing component; 41. Base plate; 42. Driving motor; 43. Driving rod; 44. Bracket; 5. Magnetic hot plate component; 51. Magnetic plate; 52. Heating plate; 6. Sliding component; 61. Sealing strip; 62. Slide rail; 63. Slide block; 7. Shrinking component; 71. Connecting pipe; 72. Energized solenoid; 8. Energizing component; 81. Limit seat; 82. Insert block; 83. Rotating handle; 9. Elastic strip. Detailed implementation

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0040] Terms such as "upper", "lower", "left", "right", "middle" and "one" cited in the present invention are only for the convenience of description and clarity, rather than to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0041] Refer to Figures 1 - 11 , an engineering model 3D printing device, including: a support frame 1, a feeding device 2 arranged outside the support frame 1, a printing component 3 installed on the upper side inside the support frame 1, and a placing component 4 installed on the inner side of the support frame 1. The placing component 4 includes a base plate 41, and a magnetic hot plate component 5 is arranged on the base plate 41;

[0042] The magnetic hot plate component 5 includes a magnetic plate 51 and a heating plate 52. The heating plate 52 is arranged on the upper side of the base plate 41, and the magnetic plate 51 is arranged on the upper side of the heating plate 52 through a sliding component 6;

[0043] The sliding component 6 includes a plurality of sealing strips 61. The plurality of sealing strips 61 are fixedly connected in parallel to the bottom surface of the magnetic plate 51, and a plurality of sealed heating spaces are formed between two adjacent sealing strips 61;

[0044] A shrinking component 7 is arranged inside the sealed heating space. The shrinking component 7 is used to pull two adjacent sealing strips 61 closer, driving the magnetic plate 51 to bend upward. The shrinking component 7 includes two connecting pipes 71 and an energized solenoid 72. The two connecting pipes 71 are respectively fixedly connected to one side of the two sealing strips 61 close to each other, and the energized solenoid 72 is fixedly connected between the two connecting pipes 71.

[0045] In an embodiment of applying the above technical solution, printing and stacking are performed on the surface of the magnetic plate 51 by the printing component 3. After printing is completed, the energized solenoid is energized, and the energized solenoid 72 contracts through a strong current, so as to pull the sealing strip 61 through the energized solenoid 72, pull the sealing strip 61 closer, and the sealing strip 61 pulls and bends the magnetic plate 51. A pulling force is generated between the deformed magnetic plate 51 and the shaped printed object, so that the magnetic plate 51 is separated from the printed object, facilitating the rapid separation of the printed object from the magnetic plate 51.

[0046] The process of the magnetic hot plate adsorbing plastic materials mainly depends on the magnetism on the surface of the magnetic hot plate and certain properties in the plastic materials, such as containing magnetizable components or being specially treated. Special types of plastics, such as plastic composites containing iron powder or other magnetic substances, may have certain magnetism or be magnetizable, and can be adsorbed on the surface of the hot plate when subjected to the magnetic force of the magnetic hot plate, thus realizing a stable printing process.

[0047] After printing is completed, the present invention can separate the printed object by bending the magnetic plate 51, so that it is not necessary to disassemble the magnetic plate 51, facilitating the removal of the printed object.

[0048] The preferred technical solution in this embodiment:

[0049] Refer to Figure 3 , the placement component 4 further includes a driving motor 42, a driving rod 43 and a bracket 44. The driving motor 42 is fixedly installed at the inner bottom of the support frame 1. The driving rod 43 is fixedly connected to the output end of the driving motor 42. The bracket 44 is installed on the driving rod 43. The driving rod 43 is used to drive the bracket 44 to move up and down. The bottom plate 41 is fixedly connected to the bracket 44.

[0050] When performing 3D printing work, by controlling the driving motor 42 to drive the driving rod 43 to rotate, since the bracket 44 is helically connected to the driving rod 43, as the driving rod 43 rotates, the bracket 44 will rotate along the thread on the driving rod 43, thereby driving the bracket 44 to move up and down in cooperation with the printing component 3, facilitating rapid 3D printing work.

[0051] Refer to Figure 3 , the printing component 3 includes a driving carriage 31, a heating module 32 and a nozzle end 33. The driving carriage 31 is fixedly installed at the upper inner part of the support frame 1. The heating module 32 is slidably arranged on the driving carriage 31. The nozzle end 33 is fixedly connected below the heating module 32.

[0052] When the 3D printing device is working, the feeding device 2 introduces the raw material into the heating module 32. The material is melted by the heating module 32 and then stacked on the magnetic hot plate assembly 5 through the nozzle end 33.

[0053] Referring to Figures 5 - 9 , the sliding assembly 6 further includes a plurality of slide rails 62 and a plurality of sliders 63. The plurality of slide rails 62 are fixedly connected to the heating plate 52 in parallel. The plurality of sealing strips 61 are arranged perpendicular to the slide rails 62. The plurality of sliders 63 are fixedly connected to the plurality of sealing strips 61 and are respectively slidably arranged inside the plurality of slide rails 62;

[0054] The part of the sealing strip 61 located between two slide rails 62 bulges outwards. A sealed heating space is formed between two adjacent slide rails 62 and two adjacent sealing strips 61. The plurality of sealed heating spaces are distributed in a matrix between the magnetic plate 51 and the heating plate 52;

[0055] The upper end of the sealing strip 61 is fixedly connected to the magnetic plate 51 and is elastically arranged at the upper end for the magnetic plate 51 to be deformed and stretched.

[0056] During the installation of the magnetic plate 51 and the heating plate 52, by sliding the sliders 63 correspondingly into the plurality of slide rails 62, the magnetic plate 51 and the heating plate 52 can be quickly installed and disassembled, which facilitates the cleaning of the slag remaining on the surface of the magnetic plate 51.

[0057] In order to ensure the bending of the magnetic plate 51, the magnetic plate 51 has a certain elasticity, and the thickness of the part of the magnetic plate 51 that needs to be bent is thinner than the part fixedly connected to the sealing strip 61. Normally, the magnetic plate 51 is supported and shaped by the plurality of sealing strips 61, so that the magnetic plate 51 has sufficient supporting force to support the printed object, meeting the overall deformation and support requirements of the magnetic plate 51. When the magnetic plate 51 is pulled and starts to bend upwards, due to the elastic connection between the sealing strip 61 and the magnetic plate 51, a certain extension space is provided for the magnetic plate 51 during bending.

[0058] Since the magnetic plate 51 needs to be heated by the heating plate 52, the magnetic hot plate can quickly and evenly heat the printing area. This heating effect helps to control the melting and solidification process of the printing material, improving the printing quality and accuracy;

[0059] The original magnetic hot plate directly transfers heat to the magnetic plate 51, which will cause rapid heat loss and consume more energy. Through the high-temperature-resistant sealing strips 61 and slide rails 62, a plurality of sealed heating spaces are formed between the magnetic plate 51 and the heating plate 52. The sealed heating spaces are used to store heat, reduce heat loss, and thus reduce energy consumption;

[0060] After printing is completed, since the bottom of the printed object has adhered to the magnetic plate 51, in order to ensure that the printed object can be quickly separated from the magnetic plate 51 during the separation process, the energized solenoid 72 is energized, so that the energized solenoid 72 generates heat, increasing the temperature inside the sealed heating space, heating the part where the printed object adheres to the magnetic plate 51, thereby melting the contact part, facilitating the separation of the printed object and the magnetic plate 51 during the subsequent folding and bending of the magnetic plate 51.

[0061] Refer to Figures 7 - 9 , below the middle of the sliding assembly 6, there is an energizing assembly 8, and the energizing assembly 8 is used to limit the position of the sliding assembly 6 on the heating plate 52 and at the same time energize the energized solenoid 72;

[0062] The energizing assembly 8 includes a limit seat 81, an insertion block 82 and a turning handle 83. The limit seat 81 is fixedly connected to the middle of the sealing strip 61 in the middle of the sliding assembly 6. There are connection ports opened in the middle of the bottom plate 41 and the heating plate 52. The insertion block 82 is slidably arranged inside the connection port, and the turning handle 83 is fixedly connected to the side of the insertion block 82.

[0063] When installing the magnetic plate 51 and the heating plate 52, in order to ensure the effective fixation and connection of the magnetic plate 51 and the heating plate 52, the limit seat 81 is moved to the installation port position of the heating plate 52, and then the outer turning handle 83 is operated to drive the insertion block 82 to move upward. By rotating the insertion block 82, the insertion block 82 is screwed to the limit seat 81, and at the same time, the circuit inside the insertion block 82 is connected to the limit seat 81, which is used to energize a plurality of energized solenoids 72.

[0064] Since the magnetic plate 51 will be bent when the energized solenoid 72 contracts, resulting in a change in the shape of the magnetic plate 51. In order to prevent the position of the magnetic plate 51 from changing greatly due to irregular contraction of the magnetic plate 51, the center position of the magnetic plate 51 is fixed by the energizing assembly 8, so that during the contraction process of the magnetic plate 51, the magnetic plates 51 on both sides start to contract towards the middle, ensuring that the printed object above the magnetic plate 51 will not tilt greatly and ensuring the stability of the printed object.

[0065] Refer to Figures 9 - 11 , between the two connecting pipes 71, there is an elastic strip 9. The elastic strip 9 is fixedly connected to the upper sides of the two connecting pipes 71 and is used to limit the distance between the two connecting pipes 71;

[0066] The elastic strip 9 is made of an elastic material, and its cross-section is semicircular. There is a heat conduction port opened in the middle of the elastic strip 9, and when it bends upward, the cross-section is V-shaped.

[0067] The two connecting pipes 71 are fixedly connected through an elastic member, and at the same time, the energized solenoid 72 is protected to prevent the energized solenoid 72 inside from being squeezed when the printed object on the magnetic plate 51 is pressed down, ensuring the normal use of the energized solenoid.

[0068] When the energized solenoid 72 is energized, the energized solenoid 72 contracts, thereby driving the two connecting pipes 71 on both sides to approach each other. During the process of the connecting pipes 71 approaching each other, the elastic strip 9 will bend upward. During the bending process of the elastic strip 9, it can support the bent magnetic plate 51, thereby strengthening the bending of the magnetic plate 51 and ensuring the separation between the magnetic plate 51 and the printed object.

[0069] At the same time, the heat conduction ports on the elastic strip 9 can ensure the normal conduction of the heat generated by the energized solenoid 72.

[0070] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An engineering model 3D printing device, comprising: A support frame (1), a feeding device (2) arranged outside the support frame (1), a printing assembly (3) installed on the upper side of the support frame (1), and a placement assembly (4) installed on the inner side of the support frame (1), characterized in that the placement assembly (4) comprises a bottom plate (41), and a magnetic hot plate assembly (5) is arranged on the bottom plate (41); The magnetic hot plate assembly (5) comprises a magnetic plate (51) and a heating plate (52), wherein the heating plate (52) is arranged on the upper side of the bottom plate (41), and the magnetic plate (51) is arranged on the upper side of the heating plate (52) via a sliding assembly (6); The sliding assembly (6) comprises a plurality of sealing strips (61), wherein the plurality of sealing strips (61) are fixedly connected in parallel to the bottom surface of the magnetic plate (51), and a plurality of sealed heating spaces are formed between two adjacent sealing strips (61); A shrinking assembly (7) is provided inside the sealed heating space, and the shrinking assembly (7) is used to pull two adjacent sealing strips (61) closer together, thereby driving the magnetic plate (51) to bend upwards, and the shrinking assembly (7) comprises two connecting tubes (71) and an energized solenoid (72), wherein the two connecting tubes (71) are respectively fixedly connected to the sides of the two sealing strips (61) that are close to each other, and the energized solenoid (72) is fixedly connected between the two connecting tubes (71); An energizing component (8) is provided below the middle of the sliding component (6), and the energizing component (8) is used to limit the position of the sliding component (6) on the heating plate (52) and energize the energizing solenoid (72) at the same time; The power supply component (8) comprises a limit seat (81), an insert block (82) and a rotating handle (83); the limit seat (81) is fixedly connected to the middle of a sealing strip (61) in the middle of the sliding component (6); a connecting port is provided in the middle of the bottom plate (41) and the heating plate (52); the insert block (82) is slidably arranged inside the connecting port; and the rotating handle (83) is fixedly connected to a side of the insert block (82).

2. The engineering model 3D printing device according to claim 1, characterized in that: The placement assembly (4) further comprises a driving motor (42), a driving rod (43) and a bracket (44); the driving motor (42) is fixedly mounted on the bottom of the support frame (1); the driving rod (43) is fixedly connected to the output end of the driving motor (42); the bracket (44) is mounted on the driving rod (43); the driving rod (43) is used to drive the bracket (44) to move up and down; and the bottom plate (41) is fixedly connected to the bracket (44).

3. The engineering model 3D printing device according to claim 1, characterized in that: The printing assembly (3) comprises a driving carriage (31), a heating module (32) and a nozzle end (33); the driving carriage (31) is fixedly mounted on the upper end of the support frame (1); the heating module (32) is slidably arranged on the driving carriage (31); and the nozzle end (33) is fixedly connected below the heating module (32).

4. The engineering model 3D printing device according to claim 1, characterized in that: The sliding assembly (6) further comprises a plurality of sliding rails (62) and a plurality of sliding blocks (63); the plurality of sliding rails (62) are fixedly connected in parallel to the heating plate (52); the plurality of sealing strips (61) are arranged perpendicular to the sliding rails (62); and the plurality of sliding blocks (63) are fixedly connected to the plurality of sealing strips (61) and are respectively slidably arranged inside the plurality of sliding rails (62).

5. The engineering model 3D printing device according to claim 4, characterized in that: The portion of the sealing strip (61) located between the two slide rails (62) protrudes outwards, and a sealed heating space is formed between two adjacent slide rails (62) and two adjacent sealing strips (61), and a plurality of the sealed heating spaces are distributed in a matrix between the magnetic plate (51) and the heating plate (52).

6. The engineering model 3D printing device according to claim 1, characterized in that: The upper end of the sealing strip (61) is fixedly connected to the magnetic plate (51), and the upper end is elastically arranged to be used for deformation and stretching of the magnetic plate (51).

7. The engineering model 3D printing device according to claim 1, characterized in that: An elastic strip (9) is provided between the two connecting tubes (71); the elastic strip (9) is fixedly connected to the upper sides of the two connecting tubes (71) and is used to limit the distance between the two connecting tubes (71).

8. The engineering model 3D printing device according to claim 7, characterized in that: The elastic strip (9) is made of an elastic material and has a semicircular cross section. A heat conduction opening is provided in the middle of the elastic strip (9), and when bent upward, the cross section is V-shaped.

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