CN116968311A

CN116968311A - 3D printing device of limbs fixed splint

Info

Publication number: CN116968311A
Application number: CN202311118778.8A
Authority: CN
Inventors: 李孛
Original assignee: Ningde Normal University Affiliated Ningde City Hospital Ningde City Hospital
Current assignee: Ningde Normal University Affiliated Ningde City Hospital Ningde City Hospital
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2023-10-31

Abstract

The application discloses a 3D printing device of a limb fixing clamp plate, which comprises an outer frame, a conveying pipe and an inner frame, wherein an ejection assembly is arranged below the inner frame and is used for heating wires and ejecting the wires, a cleaning mechanism is further arranged on one side of the outer frame and is used for cleaning the ejection assembly, and a heat dissipation assembly is arranged on the outer side of the conveying pipe.

Description

3D printing device of limbs fixed splint

Technical Field

The application relates to the technical field of 3D printing, in particular to a 3D printing device of a limb fixing splint.

Background

3D printing technology, also known as additive manufacturing, is a manufacturing method by building objects layer by layer. Unlike conventional subtractive manufacturing, which does not require the manufacture of objects by cutting or engraving, but rather is constructed by adding materials, the basic principle of 3D printing is to decompose a 3D model of an object into a plurality of very thin cross-sectional layers and stack the layers layer by layer to create the final object, and 3D printing has many advantages of high design freedom, reduced material waste, and reduced cost, so that it can be widely used in many fields of aerospace, automobile manufacturing, medical treatment, and the like.

In the medical field, for example, various limb fixation splints frequently used in orthopaedics can be manufactured by using a 3D printing technology, and the limb fixation splints are manufactured by the 3D printing technology, firstly, the 3D printing technology has customization, namely, the splints can be manufactured according to specific needs and body sizes of patients, personalized customization is realized, better fitness and comfort are provided, secondly, the 3D printing technology can adopt a lightweight design, the burden on limbs of the patients is reduced, the comfort of the patients is improved, and finally, the 3D printing technology can be designed into complex geometric structures and embedded functions for reinforcing support, providing ventilation or promoting wound healing and the like.

The limb fixing splint is manufactured by using the 3D printing technology, and is generally molded in a fused deposition mode, and plastic wires such as ABS, PLA and the like are selected, and are sprayed out through a spray head after being melted, so that the plastic wires in a fused state are very high in viscosity and easy to adhere to the spray head, and after each printing is finished, a heater is powered off, the residual molten wires in the spray head can be rapidly cooled and adhered to the inside of the spray head, the spray head can be blocked or even damaged, in addition, the spray head is worn, the spray head is possibly damaged due to improper temperature control of the heater, untimely cleaning and other reasons, the spray head needs to be replaced frequently, and the working efficiency of the printer is influenced by complex disassembly and assembly work during replacement.

Disclosure of Invention

In order to enable the nozzle replacement process to be faster and more convenient, the printing efficiency is not affected, and residual wires in the nozzle can be cleaned in time, the application provides a 3D printing device of a limb fixing clamp plate.

In a first aspect, the present application provides a 3D printing apparatus for a limb fixing splint, which adopts the following technical scheme:

the utility model provides a 3D printing device of limbs fixation splint, includes outer frame, be provided with in the outer frame:

the conveying pipe is fixedly connected to the outer frame and provided with a heat dissipation mechanism;

the inner frame is movably arranged in the outer frame and can move up and down in the outer frame;

a mounting plate is arranged below the inner frame, a mounting opening is formed in the mounting plate, and a spraying assembly is arranged in the mounting opening;

the ejection assembly includes;

the spray head is used for spraying the silk material for printing;

one end of the throat pipe is connected to the spray head;

the heater is arranged on the outer side of the throat and is used for heating the throat;

the sleeve is sleeved on the outer side of the throat pipe and fixed above the heater, and is used for connecting the throat pipe and the conveying pipe;

the inner frame is also rotationally connected with a rotating shaft, one end of the rotating shaft is connected with a motor, the other end of the rotating shaft is fixedly connected with the mounting plate, and the rotating shaft is used for driving the mounting plate to rotate;

one end of the conveying pipe, which is opposite to the throat pipe, is provided with an inclined surface, the outer side of the conveying pipe is also connected with a circular sealing plate, and the lower end surface of the circular sealing plate is provided with a bulge;

the outer frame one side still is provided with clearance mechanism, clearance mechanism is used for clearing up the jam in the shower nozzle, clearance mechanism includes:

the mounting cylinder is fixedly connected to one side of the outer frame;

the stepped shaft is movably arranged in the mounting cylinder, one end of the stepped shaft extends out of the mounting cylinder, the stepped shaft can move up and down along the direction of the heating cylinder, and a clamping groove is formed in the stepped shaft;

the heating rod is fixedly arranged at one end of the stepped shaft and can be electrified for heating.

Further, the heat dissipation assembly includes:

the outer frame is provided with a mounting hole corresponding to the cooling fan, and the cooling fan is mounted in the mounting hole on the outer frame;

the heat dissipation water pipe is spirally sleeved on the outer side of the conveying pipe;

and the radiating fin is fixedly arranged on the outer side of the conveying pipe, and a hole for the radiating water pipe to pass through is formed in the radiating fin.

Further, the inside rotation of outer frame is connected with the screw thread axle, the one end of screw thread axle is connected with the motor, one side of screw thread axle still is equipped with the guiding axle, screw hole and guiding hole have been seted up to the inner frame corresponding position, screw thread axle and guiding axle wholly run through the inner frame.

Further, a sealing groove is formed in the sleeve towards the inner portion of one end of the conveying pipe, the position of the sealing groove corresponds to the position of the protrusion at the lower end of the circular sealing plate, and a gasket is arranged in the sealing groove.

Further, the cleaning mechanism further includes:

the first baffle is fixedly connected to the stepped shaft;

the first spring is sleeved on the stepped shaft, and two ends of the first spring are respectively abutted to the first baffle and the inner wall of the mounting cylinder.

Further, the through-hole has been seted up on the lateral wall of installation section of thick bamboo, and the through-hole position is installed and is used for the screens mechanism to the step shaft screens, screens mechanism includes:

the side fixing cylinder is fixedly connected to the through hole on the side surface of the mounting cylinder;

the clamping pin integrally penetrates through the side fixing cylinder, and one end of the clamping pin can be inserted into a clamping groove of the stepped shaft;

the second baffle is fixedly connected to the outer side of the bayonet lock;

and the second spring is sleeved on the clamping pin, and two ends of the second spring are respectively abutted against the inner walls of the second baffle and the side fixing cylinder.

Further, the mounting plate is formed by splicing a plurality of laminate plates.

Further, the side of the heater is fixedly connected with a connecting sheet, and the heater is fixed in a mounting opening on the mounting plate through the cooperation of the connecting sheet and a screw.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the application, on one hand, because the four spray heads are arranged, when the spray heads are replaced, the novel spray heads can be quickly installed in a butt joint manner with the conveying pipe by only rotating the mounting plate, no worry about continuous printing caused by damage of the spray heads is needed, meanwhile, the spray heads can be cleaned through the cleaning mechanism, the situation that the spray heads are blocked or even damaged due to the fact that wires remain in the spray heads is avoided, on the other hand, four spray heads with different specifications can be used in the four spray assemblies, the printing of workpieces is conveniently carried out by using wires with different specifications, and the multiple heat dissipation modes of the heat dissipation mechanism are combined to be used, so that the influence on normal supply of wires and even the influence on printing quality due to the fact that the wires are melted in advance due to the fact that the temperature of the conveying pipe is too high is avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present application;

FIG. 2 is a schematic view of the internal structure of the outer frame of the present application;

FIG. 3 is a schematic view showing the positional relationship of the inner frame, the ejection assembly, the delivery tube, and the heat dissipating mechanism of the present application;

FIG. 4 is a schematic view of the connection of the spindle, mounting plate and ejection assembly of the present application;

FIG. 5 is a schematic view of a portion of the structure of an ejection assembly of the present application;

FIG. 6 is a cross-sectional view of an ejection assembly and delivery tube of the present application;

FIG. 7 is a schematic diagram showing the connection relationship between the conveying pipe and the heat dissipation mechanism part structure of the present application;

FIG. 8 is a cross-sectional view of the connection between the cleaning mechanism and the detent mechanism of the present application.

Reference numerals illustrate: 1. an outer frame; 2. a delivery tube;

3. a heat dissipation mechanism; 31. a heat radiation fan; 32. a heat dissipation water pipe; 33. a heat sink;

4. a circular sealing plate; 41. a protrusion;

5. an inner frame; 6. a threaded shaft; 7. a guide shaft; 8. a rotating shaft;

9. a mounting plate; 91. a mounting port;

10. a jetting assembly; 101. a spray head; 102. a throat; 103. a heater; 104. a connecting sheet; 105. a sleeve; 106. sealing grooves; 107. a gasket;

11. a cleaning mechanism; 111. a mounting cylinder; 112. a stepped shaft; 113. a clamping groove; 114. a heating rod; 115. a first baffle; 116. a first spring;

12. a clamping mechanism; 121. a side fixing cylinder; 122. a bayonet lock; 123. a second baffle; 124. and a second spring.

Detailed Description

The application will be described in further detail below with reference to fig. 1-8 (based on practice).

Firstly, in the prior art, a common 3D printing device generally comprises an axis and a motion platform, wherein the axis is a moving part of a printer, and generally comprises an X axis, a Y axis and a Z axis, and the three axes work cooperatively, so that the printer nozzle 101 can move accurately in a three-dimensional space; the motion platform refers to a printing base for carrying an object being printed.

The embodiment of the application discloses a 3D printing device of a limb fixing splint, which specifically illustrates the structure of a printer nozzle 101 part, the above-mentioned shaft structure belongs to the prior art, and is omitted here, and the specific structure is as follows:

referring to fig. 1 and 2, a 3D printing device of a limb fixation splint includes an outer frame 1, in actual use, the outer frame 1 is used for carrying other structures, and meanwhile, the outer frame 1 and the above-mentioned shaft structure can drive the outer frame 1 to move in a three-dimensional space through the shaft structure.

A conveying pipe 2 is arranged on one side of the outer frame 1, wherein wires required for printing are required to be transmitted through the conveying pipe 2;

an inner frame 5 is provided inside the outer frame 1, and an ejection assembly 10 that melts and ejects the wire is provided below the inner frame 5.

Referring to fig. 3-6, first, the ejection assembly 10 includes a nozzle 101, a throat 102 and a heater 103, wherein one end of the throat 102 is connected to the nozzle 101, the other end is connected to a delivery pipe 2, the throat 102 is generally a metal pipe, the heater 103 is sleeved outside the throat 102, when the heater 103 is energized, an internal heating element (generally composed of a resistance wire or a resistance coil) is energized to generate heat energy, the heat energy heats the throat 102 and wires in the throat 102, and the heater 103 is provided with a control circuit, so that a required temperature can be accurately maintained.

In order to fix the heater 103 and the spray head 101, the mounting plate 9 is further arranged below the inner frame 5, four mounting openings 91 are formed in the mounting plate 9 at equal intervals, connecting pieces 104 which are L-shaped are fixedly connected to the side edges of the heater 103, the connecting pieces 104 can be fixed to the mounting plate 9 through screws, in order to facilitate heat dissipation of the heater 103, the mounting plate 9 can be formed by splicing and combining multiple layers of thin plates, as shown in fig. 4, the mounting plate 9 is formed by stacking five layers of thin plates up and down, gaps are reserved between the thin plates, and heat dissipation is facilitated.

In order to fix the mounting plate 9, a rotating shaft 8 is welded and fixed above the mounting plate 9, a shaft sleeve (not shown) is connected to the upper end of the rotating shaft 8, the rotating shaft 8 is rotatably connected with the shaft sleeve through a plane bearing, and the shaft sleeve is fixed on the inner frame 5, because four mounting openings 91 are formed in the mounting plate 9, four spraying assemblies 10 can be mounted, in order to enable the mounting plate 9 to rotate, each mounting opening 91 can correspond to the conveying pipe 2, a stepping motor (not shown) is connected to the upper end of the rotating shaft 8, the rotating angle of the mounting plate 9 can be controlled, and after rotation, the spraying assemblies 10 can correspond to the conveying pipe 2.

Namely, the rotating shaft 8 and the mounting plate 9 are driven to rotate by the stepping motor, so that the purpose of replacing the used spraying assembly 10 is achieved.

Referring back to fig. 2, in order to facilitate the connection between the ejection assembly 10 and the upper delivery pipe 2, so that the wires can smoothly pass through the delivery pipe 2 and enter the throat 102, firstly, a threaded shaft 6 is rotatably connected inside the outer frame 1, one end of the threaded shaft 6 is connected with a motor (not labeled in the figure), meanwhile, a guiding shaft 7 is further arranged inside the outer frame 1 and located at one side of the threaded shaft 6,

screw holes and guide holes are formed in corresponding positions of the inner frame 5, the screw shaft 6 and the guide shaft 7 integrally penetrate through the inner frame 5, and when the screw shaft 6 is driven by a motor to rotate, the inner frame 5 can be driven to move up and down, namely, the rotating shaft 8, the mounting plate 9 and the spraying assembly 10 on the mounting plate 9 can move up and down together, so that the throat 102 (marked in the above-mentioned figure 5) and the conveying pipe 2 are in butt joint.

With continued reference to fig. 5 and 6, on the other hand, since the wire may be in a molten state in the throat 102, when pressure is applied to the wire in a molten state to be ejected from the nozzle 101, since the throat 102 and the delivery pipe 2 have a larger diameter than the wire, that is, the wire in a molten state may also move reversely and upwardly, the wire is extruded from the junction between the throat 102 and the delivery pipe 2, in order to avoid this, a sleeve 105 is sleeved outside the portion of the throat 102 extending out of the upper end of the heater 103, the lower end of the sleeve 105 is fixed on the heater 103, wherein a sealing groove 106 is further opened on the side facing the delivery pipe 2 on the sleeve 105, and a gasket 107 is laid in the sealing groove 106, where the gasket 107 may be made of a high temperature resistant material, for example, using a teflon Long Dianpian, which is excellent in high temperature resistance and sealing property.

Meanwhile, in order to be matched with the sleeve 105, a circular sealing plate 4 is fixedly connected to the outer side of the conveying pipe 2, a protrusion 41 is arranged at a position, corresponding to the sealing groove 106, of the lower end face of the circular sealing plate 4, when the sleeve 105 moves upwards, the protrusion 41 at the lower end of the circular sealing plate 4 can be clamped in the clamping groove 113, namely pressed on the gasket 107, and a gap between the sleeve 105 and the circular sealing plate 4 is sealed.

Meanwhile, the opposite ends of the conveying pipe 2 and the throat pipe 102 can be provided with opposite inclined surfaces, as shown in fig. 6, the conveying pipe 2 is attached to the inclined surfaces on the throat pipe 102, so that the tightness between the conveying pipe 2 and the throat pipe 102 is further improved, and molten wires are prevented from being extruded from a connecting gap.

Referring to fig. 7, since the throat 102 is heated by the heater 103, the temperature is high, and the temperature of the delivery pipe 2 in contact with the throat 102 is also raised due to heat conduction, but in actual use, the wire has a low softening point or melting point, and if the delivery pipe 2 is overheated, the wire is melted or deformed in the delivery pipe 2, which causes the wire to adhere in the delivery pipe 2, thereby affecting the normal feeding and printing quality of the wire.

In order to solve the above problem, a heat dissipation mechanism 3 is disposed on a conveying pipe 2, the heat dissipation mechanism 3 includes a heat dissipation fan 31, a heat dissipation water pipe 32 and a heat dissipation fin 33, firstly, the heat dissipation fin 33 is connected to the outer side of the conveying pipe 2, the heat dissipation fin 33 is made of metal, the heat conduction performance is good, the heat dissipation area of the heat dissipation fin 33 is increased, the heat dissipation is accelerated, in order to match with the heat dissipation fin 33, a mounting hole is formed in the outer frame 1 corresponding to the heat dissipation fin 33, the heat dissipation fan 31 (marked in fig. 1) is mounted in the mounting hole, meanwhile, the heat dissipation water pipe 32 is spirally wound on the outer side of the conveying pipe 2, and the heat dissipation water pipe 32 is led to pass through the heat dissipation fin 33, namely, the conveying pipe 2 is cooled in a mode of combining the heat dissipation water pipe 32, the heat dissipation fin 33 and the heat dissipation fan 31, so that the wire is prevented from being melted or deformed in advance due to overhigh temperature of the conveying pipe 2.

Referring to fig. 8, when the printing is finished, the heater 103 stops heating, and at this time, a part of molten wire may still remain in the nozzle 101, and the remaining wire may quickly solidify due to the stop of the heater 103, accumulate in the nozzle 101, and need to be cleaned in time, so as to avoid blocking or even damaging the nozzle 101. In order to clean the residual wire inside the head 101, a cleaning mechanism 11 is provided on one side of the outer frame 1 (wherein the positional relationship between the cleaning mechanism 11 and the outer frame 1 is as shown in fig. 1), specifically:

the cleaning mechanism 11 comprises a mounting cylinder 111, a stepped shaft 112 and a heating rod 114, wherein the mounting cylinder 111 is fixedly connected to one side of the outer frame 1, the stepped shaft 112 is movably mounted inside the mounting cylinder 111, the upper end of the stepped shaft extends out of the mounting cylinder 111, the heating rod 114 is mounted at the lower end of the stepped shaft 112, the lower end of the heating rod 114 is tapered, the heating rod 114 is conveniently and directly inserted into a solidified wire, the wire is secondarily heated after being electrified, and the wire is melted.

Meanwhile, a first baffle 115 is fixedly connected to the stepped shaft 112, and a first spring 116 is sleeved on the stepped shaft 112, wherein two ends of the first spring 116 are respectively abutted against the first baffle 115 and the inner wall of the mounting cylinder 111;

namely, when the first spring 116 is at the initial position, the stepped shaft 112 and the heating rod 114 are at the highest position, when the stepped shaft 112 is manually pressed downwards, the heating rod 114 is inserted into the spray head 101 to be cleaned, at this time, the first spring 116 is in a compressed state, in order to fix the position of the heating rod 114, one side of the fixing cylinder is further provided with the clamping mechanism 12, and in order to cooperate with the clamping mechanism 12, the stepped shaft 112 is provided with the clamping groove 113, specifically:

the clamping mechanism 12 comprises a side fixing cylinder 121, wherein a through hole is formed in the side wall of the mounting cylinder 111, the side fixing cylinder 121 is communicated with the mounting cylinder 111, the side fixing cylinder 121 is fixedly connected with the mounting cylinder 111, a clamping pin 122 is movably connected in the side fixing cylinder 121, the clamping pin 122 integrally penetrates through the side fixing cylinder 121, one end of the clamping pin 122 can be inserted into a clamping groove 113 in the stepped shaft 112, a second baffle 123 is fixedly connected to the clamping pin 122, a second spring 124 is sleeved on the clamping pin 122, and two ends of the second spring 124 are respectively abutted to the second baffle 123 and the inner wall of the side fixing cylinder 121.

That is, when the stepped shaft 112 is not pressed to move downwards, under the action of the No. two springs 124, the right end of the bayonet lock 122 passes through the through hole on the side surface of the mounting cylinder 111 to enter the mounting cylinder 111 and is abutted against the stepped shaft 112, at this time, when the stepped shaft 112 moves downwards, that is, when the position of the clamping groove 113 moves to the height of the bayonet lock 122, the bayonet lock 122 continues to move under the action of the No. two springs 124 until the bayonet lock is inserted into the clamping groove 113 to fix the stepped shaft 112, and at this time, the heating rod 114 below the stepped shaft 112 is also fixed inside the spray head 101 to be cleaned.

To sum up: when the residual wires in the spray head 101 need to be cleaned, the threaded shaft 6 is controlled to rotate at first, so that the inner frame 5 integrally moves downwards, the spray assembly 10 is separated from the conveying pipe 2, at the moment, the tail end of the conveying pipe 2 is cleaned conveniently, meanwhile, the rotating shaft 8 is controlled to drive the mounting plate 9 to rotate, the spray assembly 10 is transferred to the position below the corresponding position of the heating rod 114 from the position at the lower end of the conveying pipe 2, the stepped shaft 112 is pressed downwards until the heating plate is inserted into the spray head 101, meanwhile, the clamping pin 122 is inserted into the clamping groove 113, the stepped shaft 112 is fixed, the heating rod 114 is electrified, so that the heating rod 114 heats the residual wires solidified in the spray head 101 again, and the residual wires are melted and drip, so that the spray head 101 is prevented from being blocked or even damaged by the residual wires.

When the bayonet 122 is pulled outward, the bayonet 122 and the stepped shaft 112 are separated from contact, and the stepped shaft 112 and the heating rod 114 are reset under the action of the first spring 116.

The implementation principle of the embodiment is as follows:

(one): firstly, the whole inner frame 5 is controlled to move upwards through the threaded shaft 6 until the conveying pipe 2 is contacted with the throat 102, the conveying pipe 2 is attached to the opposite inclined surface on the throat 102, the tightness between the conveying pipe 2 and the throat 102 is improved, meanwhile, the bulge 41 below the circular sealing plate 4 is clamped into the sealing groove 106 of the sleeve 105, and the gap of the joint is sealed by matching with the gasket 107, so that molten wires are prevented from being extruded from the joint.

(II): when the wire is used, the wire is melted by the heater 103 in the throat 102 through the conveying pipe 2 and the throat 102, and is changed into a molten state to be sprayed out of the spray head 101, and in the process, the conveying pipe 2 is cooled by using a mode of combining the radiating water pipe 32, the radiating fins 33 and the radiating fan 31, so that the problem that the normal supply of the wire is influenced or even the printing quality is influenced due to the fact that the wire is melted in advance due to overhigh temperature of the conveying pipe 2 is avoided.

(III): when the spray head 101 is replaced or cleaned, firstly, the inner frame 5 is controlled to move downwards, the spray assembly 10 is separated from the conveying pipe 2, at the moment, the tail end of the conveying pipe 2 is conveniently cleaned, meanwhile, the mounting plate 9 is controlled to rotate, the spray assembly 10 is transferred to the position below the corresponding station of the heating rod 114, the stepped shaft 112 is pressed downwards until the heating plate is inserted into the spray head 101, meanwhile, the clamping mechanism 12 fixes the stepped shaft 112, and the heating rod 114 is electrified, so that the heating rod 114 heats the residual wire solidified in the spray head 101 again, melts and drips, and the spray head 101 is prevented from being blocked or even damaged by the residual wire.

On the one hand, because four spray heads 101 are arranged, only the mounting plate 9 is required to be rotated when the spray heads 101 are replaced, new spray heads 101 can be quickly installed in a butt joint mode with the conveying pipe 2, the connection process is simple and efficient, the problem that the spray heads 101 are damaged to cause continuous printing is avoided, meanwhile, the spray heads 101 can be cleaned through the cleaning mechanism 11, the situation that the spray heads 101 are blocked or even damaged due to the fact that wires remain inside the spray heads 101 is avoided, on the other hand, four spray assemblies 10 can use the spray heads 101 with different specifications, the wires with different specifications are conveniently used for printing workpieces, and the heat dissipation mechanism 3 is used in a combined mode in a multiple heat dissipation mode, so that the normal supply of the wires and the printing quality are prevented from being influenced due to the fact that the wires are melted in advance due to the fact that the temperature of the conveying pipe 2 is too high.

The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. 3D printing device of limbs fixation splint, including outer frame (1), its characterized in that: the outer frame (1) is internally provided with:

the conveying pipe (2), the conveying pipe (2) is fixedly connected to the outer frame (1), and a heat dissipation mechanism (3) is arranged on the conveying pipe (2);

the inner frame (5) is movably arranged inside the outer frame (1), and the inner frame (5) can move up and down inside the outer frame (1);

a mounting plate (9) is arranged below the inner frame (5), a mounting opening (91) is formed in the mounting plate (9), and a spraying assembly (10) is arranged in the mounting opening (91);

the ejection assembly (10) includes;

a nozzle (101), wherein the nozzle (101) is used for ejecting a wire material for printing;

a throat (102), wherein one end of the throat (102) is connected to the nozzle (101);

a heater (103), wherein the heater (103) is arranged outside the throat pipe (102), and the heater (103) is used for heating the throat pipe (102);

the sleeve (105) is sleeved on the outer side of the throat (102), the sleeve (105) is fixed above the heater (103), and the sleeve (105) is used for connecting the throat (102) and the conveying pipe (2);

the inner frame (5) is also rotationally connected with a rotating shaft (8), one end of the rotating shaft (8) is connected with a motor, the other end of the rotating shaft is fixedly connected with the mounting plate (9), and the rotating shaft (8) is used for driving the mounting plate (9) to rotate;

one end, opposite to the throat pipe (102), of the conveying pipe (2) is provided with an inclined surface, a circular sealing plate (4) is further connected to the outer side of the conveying pipe (2), and a bulge (41) is arranged on the lower end face of the circular sealing plate (4);

the outer frame (1) one side still is provided with clearance mechanism (11), clearance mechanism (11) are used for clearing up the jam in shower nozzle (101), clearance mechanism (11) include:

the mounting cylinder (111), the said mounting cylinder (111) is fixedly connected to one side of the said outer frame (1);

the stepped shaft (112), the stepped shaft (112) is movably arranged in the mounting cylinder (111), one end of the stepped shaft extends out of the mounting cylinder (111), the stepped shaft (112) can move up and down along the direction of the heating cylinder, and a clamping groove (113) is formed in the stepped shaft (112);

the heating rod (114), the heating rod (114) is fixedly arranged at one end of the stepped shaft (112), and the heating rod (114) can be electrified for heating.

2. The 3D printing device of a limb fixation splint according to claim 1, wherein: the heat dissipation assembly includes:

the cooling fan (31) is arranged on the outer frame (1), a mounting hole corresponding to the cooling fan (31) is formed in the outer frame (1), and the cooling fan (31) is arranged in the mounting hole on the outer frame (1);

the radiating water pipe (32) is sleeved outside the conveying pipe (2) in a spiral manner;

and the radiating fins (33) are fixedly arranged on the outer side of the conveying pipe (2), and holes for the radiating water pipe (32) to pass through are formed in the radiating fins (33).

3. The 3D printing device of a limb fixation splint according to claim 1, wherein: the novel inner frame is characterized in that a threaded shaft (6) is connected to the inner portion of the outer frame (1) in a rotating mode, one end of the threaded shaft (6) is connected with a motor, one side of the threaded shaft (6) is further provided with a guide shaft (7), a threaded hole and a guide hole are formed in the corresponding position of the inner frame (5), and the threaded shaft (6) and the guide shaft (7) integrally penetrate through the inner frame (5).

4. The 3D printing device of a limb fixation splint according to claim 1, wherein: the sleeve (105) faces to the inside of one end of the conveying pipe (2), a sealing groove (106) is formed in the sleeve, the position of the sealing groove (106) corresponds to the position of a protrusion (41) at the lower end of the circular sealing plate (4), and a gasket (107) is arranged in the sealing groove (106).

5. The 3D printing device of a limb fixation splint according to claim 1, wherein: the cleaning mechanism (11) further includes:

a first baffle (115), wherein the first baffle (115) is fixedly connected to the stepped shaft (112);

the first spring (116) is sleeved on the stepped shaft (112), and two ends of the first spring (116) are respectively abutted against the first baffle (115) and the inner wall of the mounting cylinder (111).

6. The 3D printing device of a limb fixation splint according to claim 1, wherein: a through hole is formed in the side wall of the mounting cylinder (111), a clamping mechanism (12) for clamping the stepped shaft (112) is arranged at the position of the through hole, and the clamping mechanism (12) comprises:

a side fixing cylinder (121), wherein the side fixing cylinder (121) is fixedly connected to a through hole on the side surface of the mounting cylinder (111);

a bayonet lock (122), wherein the bayonet lock (122) integrally penetrates through the side fixing cylinder (121), and one end of the bayonet lock (122) can be inserted into a bayonet groove (113) of the stepped shaft (112);

the second baffle (123), the second baffle (123) is fixedly connected to the outer side of the bayonet lock (122);

and the second spring (124), the second spring (124) is sleeved on the bayonet lock (122), and two ends of the second spring (124) are respectively abutted on the inner walls of the second baffle (123) and the side fixing cylinder (121).

7. The 3D printing device of a limb fixation splint according to claim 1, wherein: the mounting plate (9) is formed by splicing a plurality of laminate plates.

8. The 3D printing device of a limb fixation splint according to claim 1, wherein: the side of heater (103) is fixedly connected with connection piece (104), heater (103) are fixed in mounting hole (91) on mounting panel (9) through connection piece (104) and the cooperation of screw.