Forming cylinder suitable for BJ technology

Abstract

The utility model discloses a forming cylinder suitable for the BJ technology, and relates to the technical field of additive manufacturing, the forming cylinder comprises a forming cylinder body, a lifting mechanism and a movable sealing mechanism, and a sliding hole is formed in the circumferential direction of a cylindrical shell; the lifting mechanism comprises a driving assembly and a transmission rod. The transmission rod penetrates through the sliding hole and is fixedly connected with the piston. The movable sealing mechanism comprises a steel belt and a steel belt tensioning assembly, the steel belt is arranged on the inner side of the cylindrical shell, the steel belt penetrates through a gap between the piston and the sliding hole and then is fixedly connected with the stretching end of the steel belt tensioning assembly, and the fixed end of the steel belt tensioning assembly is fixedly connected with the bottom plate. The stretching end of the steel belt tensioning assembly can tension the steel belt so that the steel belt can seal the sliding hole in the upper portion of the piston in the downward sliding process of the piston, or the steel belt can open the sliding hole in the lower portion of the piston in the rising process of the piston so that the transmission rod can slide in the sliding hole. And the height space utilization rate of the forming cylinder suitable for the BJ technology is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to additive manufacturing technology field especially to a forming cylinder suitable for BJ technology. BACKGROUND

[0002] With the development of technology and the support of national policy, 3D printing has obtained more and more attention and recognition, and industrial 3D printing equipment is generally built according to SLM (selective laser melting), SLS (selective laser sintering) and BJ (binder jetting) process methods, and the forming cylinder suitable for BJ technology is a key component of the equipment. At present, the driving mechanism of the forming cylinder suitable for BJ technology mainly has two arrangement modes, one is arranged on the forming cylinder suitable for BJ technology and moves with the forming cylinder suitable for BJ technology, and the other is arranged on the equipment outside the forming cylinder suitable for BJ technology and does not move with the forming cylinder suitable for BJ technology.

[0003] The lifting equipment of the forming cylinder suitable for BJ technology in the prior art is all arranged between the bottom plate and the piston of the forming cylinder suitable for BJ technology, and the lifting equipment occupies the height space of the forming cylinder, thereby limiting the forming height of the printed part. UTILITY MODEL CONTENT

[0004] The utility model discloses a forming cylinder suitable for BJ technology to solve the problem that the lifting equipment of the forming cylinder in the prior art is all arranged between the bottom plate and the piston of the forming cylinder, occupies space and limits the forming height of the printed part.

[0005] To achieve the above object, the utility model provides the following scheme:

[0006] The utility model provides a kind of forming cylinder suitable for BJ technology, comprising: forming cylinder body, lifting mechanism and movable sealing mechanism, the forming cylinder body includes bottom plate, piston and cylindrical shell, the bottom of the cylindrical shell is fixedly connected with the bottom plate, the piston is sealingly and slidably connected with the inner wall of the cylindrical shell, the cylindrical shell is axially arranged sliding hole;The lifting mechanism includes drive assembly and transmission rod, the fixed end of the drive assembly is fixedly connected with the outside wall of the cylindrical shell, one end of the transmission rod is fixedly connected with the lifting end of the drive assembly, and the other end is fixedly connected with the piston through the sliding hole;The movable sealing mechanism is correspondingly arranged with the sliding hole, and the movable sealing mechanism includes steel belt and steel belt tensioning assembly, the steel belt is arranged on the inside of the cylindrical shell, the top end of the steel belt is fixedly connected with the top end of the cylindrical shell, and the other end is fixedly connected with the stretching end of the steel belt tensioning assembly after passing through the gap between the piston and the sliding hole, the fixed end of the steel belt tensioning assembly is fixedly connected with the bottom plate, and the stretching end of the steel belt tensioning assembly can tighten the steel belt so that the steel belt can seal the sliding hole above the piston during the process of sliding down the piston, or the sliding hole below the piston can be opened during the process of ascending the piston so that the transmission rod can slide in the sliding hole.

[0007] Preferably, the drive assembly includes a mounting seat, a servo motor, a ball screw and a nut, the mounting seat is fixedly connected to the bottom of the outside wall of the cylindrical shell, the housing of the servo motor is fixedly connected to the mounting seat, and the nut is fixedly connected with the transmission rod;The ball screw is arranged parallel to the direction of the piston, and the bottom of the ball screw is rotationally connected with the mounting seat, the nut is threadedly sleeved on the outside of the ball screw, and the output shaft of the servo motor is drivingly connected with the ball screw through a transmission assembly to drive the nut to move along the ball screw.

[0008] Preferably, the top of the cylindrical shell is provided with an outwardly extending rim, and the top end of the ball screw is rotationally connected with the rim.

[0009] Preferably, the side plate on one side of the cylindrical shell is provided with two sliding holes, the number of transmission rods is two, the two sliding holes are symmetrically arranged about the ball screw, two slide rails are provided on the outside wall of the cylindrical shell, the two slide rails are respectively arranged on the outside of the two sliding holes and are arranged in parallel with the sliding holes, the lifting mechanism further includes two connecting plates and two lifting blocks, the two connecting plates are respectively fixedly connected on the two sides of the nut, the end of the connecting plate away from the nut is fixedly connected with the lifting block, the lifting block is slidably connected with the guide rail, one end of the transmission rod is fixedly connected with the corresponding connecting plate, and the other end is fixedly connected with the piston through one sliding hole.

[0010] Preferably, the slide rail is convex away from the side of the cylindrical shell, and the lifting slider is provided with a groove, and the convex is used for embedding and fixing in the groove;

[0011] Preferably, the width of the convex away from the side of the cylindrical shell is greater than the width of the convex close to the side of the cylindrical shell, and the width of the groove opening is less than the width of the convex away from the side of the cylindrical shell.

[0012] Preferably, the number of the lifting mechanisms is two, and the two lifting mechanisms are respectively arranged on the outer sides of the two opposite side walls of the cylindrical shell, and the number of the slide holes is four, and one slide hole is provided with one movable sealing mechanism.

[0013] Preferably, the movable sealing mechanism further comprises an arc-shaped guide, the bottom of the piston is provided with a connecting strip plate, the connecting strip plate is provided with a through hole, the bottom of the through hole is an arc-shaped part, one end of the transmission rod extending into the cylindrical shell is fixedly connected with the connecting strip plate, the top end of the arc-shaped guide is fixedly connected with the bottom of the piston, and the bottom end of the arc-shaped guide is located above the arc-shaped part to guide the steel belt into the arc-shaped part.

[0014] Preferably, the steel belt tensioning assembly comprises a tensioning seat, a guide rod, a tensioning slider and a tensioning spring, the tensioning seat is fixedly connected with the bottom plate, the guide rod is vertically arranged, the top end of the guide rod is fixedly connected with the top end of the tensioning seat, the bottom end of the guide rod is fixedly connected with the bottom end of the tensioning seat, the tensioning slider is sleeved on the outer side of the guide rod and is in sliding connection with the guide rod, the tensioning slider is fixedly connected with the bottom end of the steel belt, and the tensioning spring is sleeved on the outer side of the guide rod, the top end of the tensioning spring is fixedly connected with the top end of the tensioning seat, and the bottom end of the tensioning spring is fixedly connected with the tensioning slider.

[0015] Preferably, the 3D printing device further comprises a driving motor, a gear, a rack, a double-track rail and a double-track wheel, the rack and the double-track rail are arranged on the workbench of the 3D printing device, the shell of the driving motor is fixedly connected with the outer side wall of the cylindrical shell, the gear is sleeved and fixed on the output shaft of the driving motor, the gear is in meshing connection with the rack, and the double-track wheel is used for rolling connection on the double-track rail.

[0016] Preferably, the double-track wheel is a V-shaped wheel, the double-track rail is an inverted V-shaped structure matched with the V-shaped wheel, and the top of the double-track wheel is embedded in the bottom plate.

[0017] Compared with the prior art, the 3D printing device has the following technical effects:

[0018] 1. The utility model discloses a forming cylinder suitable for BJ technology, which is characterized in that a lifting mechanism of a piston is arranged outside the outer side wall of the forming cylinder, thereby effectively improving the height space utilization of the forming cylinder suitable for BJ technology, and the structure is simple and the height space utilization of the forming cylinder suitable for BJ technology is effectively improved.

[0019] 2. The driving motor and gear are arranged on the forming cylinder, thereby effectively ensuring the continuity of transmission and improving the stability of equipment operation.

[0020] 3. The cooperation of the V-shaped wheel and the inverted V-shaped track makes the movement of the forming cylinder more stable and less likely to deviate, and the design of the embedded bottom plate reduces the overall height of the forming cylinder and improves the space utilization. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 The structure diagram of the forming cylinder suitable for BJ technology is provided.

[0023] Figure 2 The front view of the forming cylinder suitable for BJ technology is provided.

[0024] Figure 3 The side view of Figure 2 is provided.

[0025] Figure 4 The bottom view of Figure 2 is provided.

[0026] Figure 5 The structure diagram of the movable sealing mechanism in the forming cylinder suitable for BJ technology is provided.

[0027] Figure 6 The structure diagram of the steel belt passing through the connecting strip plate in the forming cylinder suitable for BJ technology is provided.

[0028] In the figure: 1, forming cylinder body; 11, bottom plate; 12, piston; 13, cylindrical shell; 14, sliding hole; 2, lifting mechanism; 21, driving assembly; 211, mounting seat; 212, servo motor; 213, ball screw; 214, nut; 22, transmission rod; 23, connecting plate; 24, lifting slider; 25, slide rail; 3, movable sealing mechanism; 31, steel belt; 32, arc-shaped guide; 33, steel belt tensioning assembly; 331, tensioning seat; 332, guide rod; 333, tensioning slider; 334, tensioning spring; 4, driving motor; 5, gear; 6, double-track wheel; 7, connecting strip; 71, through hole. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] The utility model aims at providing a forming cylinder suitable for BJ technology to solve the problems in the prior art, and the forming cylinder has simple structure and effectively improves the height space utilization of the forming cylinder suitable for BJ technology.

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0032] The utility model provides a kind of forming cylinder suitable for BJ technology, such as Figures 1-5As shown, it comprises: a forming cylinder body 1, a lifting mechanism 2 and a movable sealing mechanism 3, the forming cylinder body 1 comprises a bottom plate 11, a piston 12 and a cylindrical shell 13, the bottom of the cylindrical shell 13 is fixedly connected with the bottom plate 11, the piston 12 is sealingly and slidably connected with the inner wall of the cylindrical shell 13, and the cylindrical shell 13 is provided with a vertical sliding hole 14; the lifting mechanism 2 comprises a driving assembly 21 and a transmission rod 22, the fixed end of the driving assembly 21 is fixedly connected with the outer side wall of the cylindrical shell 13, one end of the transmission rod 22 is fixedly connected with the lifting end of the driving assembly 21, and the other end penetrates through the sliding hole 14 and is fixedly connected with the piston 12; one movable sealing mechanism 3 is correspondingly arranged with one sliding hole 14, the movable sealing mechanism 3 comprises a steel belt 31 and a steel belt tensioning assembly 33, the steel belt 31 is arranged on the inner side of the cylindrical shell 13, the top end of the steel belt 31 is fixedly connected with the top end of the cylindrical shell 13, the other end penetrates through the gap between the piston 12 and the sliding hole 14 and is fixedly connected with the stretching end of the steel belt tensioning assembly 33, the fixed end of the steel belt tensioning assembly 33 is fixedly connected with the bottom plate 11, and the stretching end of the steel belt tensioning assembly 33 can tension the steel belt 31 so that the steel belt 31 can seal the sliding hole 14 above the piston 12 in the process of descending of the piston 12 or can open the sliding hole 14 below the piston 12 in the process of ascending of the piston 12 so that the transmission rod 22 can slide in the sliding hole 14, by arranging the lifting mechanism 2 and the movable sealing mechanism 3, the stable lifting of the piston 12 is realized, the sliding hole 14 can be effectively sealed in the process of lifting of the piston 12, the normal work of the forming cylinder is ensured, the printing quality is improved, and by arranging the lifting mechanism 2 outside the outer side wall of the forming cylinder body 1, the height space utilization rate of the forming cylinder suitable for the BJ technology is effectively improved.

[0033] In a preferred embodiment, the driving assembly 21 comprises a mounting seat 211, a servo motor 212, a ball screw 213 and a nut 214, the mounting seat 211 is fixedly connected with the bottom of the outer side wall of the cylindrical shell 13, the shell of the servo motor 212 is fixedly connected with the mounting seat 211, the bottom of the ball screw 213 is rotationally connected with the mounting seat 211, and the nut 214 is sleeved on the outer side of the ball screw 213, the output shaft of the servo motor drives the ball screw 213 to rotate through a transmission assembly and a ball screw 213 transmission member, so as to drive the nut 214 to move along the ball screw 213, the nut 214 is fixedly connected with the transmission rod 22, and the transmission assembly comprises a driving sprocket, a driven sprocket and a chain, the driving sprocket is fixedly connected with the output shaft of the servo motor 212, the driven sprocket is sleeved and fixed on the outer side of the ball screw, and the chain is transmissionally connected with the driving sprocket and the driven sprocket, the driving mode of the servo motor 212, the ball screw 213 and the chain transmission assembly is adopted, accurate lifting control is realized, and the precision and stability of the movement of the piston 12 are improved.

[0034] In a preferred embodiment, the top of the cylindrical shell 13 is provided with an outwardly extending rim, and the top end of the ball screw 213 is rotatably connected to the rim, which increases the stability of the ball screw 213 and ensures that there is no shaking during lifting, thereby improving the reliability of the device.

[0035] In a preferred embodiment, the side plate on one side of the cylindrical shell 13 is provided with two sliding holes 14, and the number of transmission rods 22 is two. The two sliding holes 14 are symmetrically arranged about the ball screw 213, and the outer side wall of the cylindrical shell 13 is provided with two sliding rails 25, which are respectively arranged outside the two sliding holes 14 and are arranged in parallel with the sliding holes 14. The lifting mechanism 2 further comprises two connecting plates 23 and two lifting blocks 24. The two connecting plates 23 are respectively fixedly connected to the two sides of the nut 214, and the end of the connecting plate 23 away from the nut 214 is fixedly connected with the lifting block 24. The lifting block 24 is slidingly connected with the guide rail. One end of one transmission rod 22 is fixedly connected with one connecting plate 23, and the other end is fixedly connected with the piston 12 through one sliding hole 14. The provision of two sliding holes 14 and transmission rods 22 improves the stability and balance of the piston 12 during lifting. The cooperation of the sliding rail 25 and the lifting block 24 further ensures the smoothness of the lifting process.

[0036] In a preferred embodiment, the side of the sliding rail 25 away from the cylindrical shell 13 is convex, and the lifting block 24 is provided with a groove. The convex portion is used to fit and fix in the groove. The width of the convex portion away from the cylindrical shell 13 is greater than the width of the convex portion close to the cylindrical shell 13, and the width of the opening of the groove is less than the width of the convex portion away from the cylindrical shell 13. This makes the connection between the lifting block 24 and the sliding rail 25 more secure, preventing the lifting block 24 from slipping during lifting, and improving the safety of the device.

[0037] In a preferred embodiment, the number of lifting mechanisms is two, and the two lifting mechanisms are respectively arranged outside the two opposite side walls of the cylindrical shell 13. The number of corresponding sliding holes 14 is four, and one sliding hole 14 is provided with one movable sealing mechanism 3. The two lifting mechanisms further improve the stability and reliability of the piston 12 during lifting, and the four sliding holes 14 and the corresponding movable sealing mechanisms 3 ensure the sealing effect.

[0038] In a preferred embodiment, the movable sealing mechanism 3 further comprises an arc-shaped guide 32, the bottom of the piston is provided with a connecting strip plate, the connecting strip plate is provided with a through hole, the bottom of the through hole is an arc-shaped portion, the transmission rod 22 is fixedly connected with the connecting strip plate at one end extending into the cylindrical shell 13, and the top end of the arc-shaped guide 32 is fixedly connected with the bottom of the piston 12, the bottom end of the arc-shaped guide 32 is located above the arc-shaped portion to guide the steel belt 31 into the arc-shaped portion, the arc-shaped portion can change the direction of the steel belt to make the steel belt have the same moving direction as the stretching end of the steel belt tensioning assembly 33; the arc-shaped guide 32 can guide the steel belt 31 to smoothly enter the arc-shaped portion of the transmission rod 22, and the arc-shaped portion can guide the steel belt to be connected with the stretching end of the steel belt tensioning assembly 33, so as to avoid the steel belt 31 from being jammed or damaged during movement, and the service life of the device is improved.

[0039] In a preferred embodiment, the steel belt tensioning assembly 33 comprises a tensioning seat 331, a guide rod 332, a tensioning sliding block 333 and a tensioning spring 334, the tensioning seat 331 is fixedly connected with the bottom plate 11, the guide rod 332 is vertically arranged, the top end of the guide rod 332 is fixedly connected with the top end of the tensioning seat 331, the bottom end of the guide rod 332 is fixedly connected with the bottom end of the tensioning seat 331, the tensioning sliding block 333 is sleeved on the outer side of the guide rod 332 and is in sliding connection with the guide rod 332, the tensioning sliding block 333 is fixedly connected with the bottom end of the steel belt 31, the tensioning spring 334 is sleeved on the outer side of the guide rod 332, the top end of the tensioning spring 334 is fixedly connected with the top end of the tensioning seat 331, and the bottom end of the tensioning spring 334 is fixedly connected with the tensioning sliding block 333; the tensioning spring is a rectangular spring, which has greater rigidity, better fatigue resistance, higher energy absorption, and is more suitable for high-load and space-limited occasions, so as to reduce the height of the steel belt tensioning assembly 33, the steel belt tensioning assembly 33 can automatically adjust the tension of the steel belt 31, and the steel belt 31 can maintain good sealing effect in different working states.

[0040] In a preferred embodiment, the forming cylinder suitable for BJ technology further comprises a driving motor 4, a gear 5, a rack, a double-track rail and a double-track wheel 6, the rack and the double-track rail are arranged on the workbench of the 3D printing device, the shell of the driving motor 4 is fixedly connected with the outer side wall of the cylindrical shell 13, the gear 5 is sleeved and fixed on the output shaft of the driving motor 4, the gear 5 is in meshing connection with the rack, and the double-track wheel is used for rolling connection on the double-track rail; through cooperation of the driving motor 4, the gear 5, the rack and the double-track wheel 6, the forming cylinder can realize accurate movement on the workbench, and the printing precision and efficiency are improved; the rack and the track are arranged on the device, each forming cylinder is provided with an adjustable wheel and the gear 5, the rack and the track on the device are taken as a reference to adjust consistency, the forming cylinders can be interchanged, and the driving motor 4 and the gear 5 arranged on the forming cylinder can effectively ensure continuous transmission and improve the running stability of the device.

[0041] In a preferred embodiment, the double-track wheel 6 is a V-shaped wheel, the double-track rail is a reverse V-shaped structure matched with the V-shaped wheel, the top of the double-track wheel 6 is embedded into the bottom plate 11, and the cooperation of the V-shaped wheel and the reverse V-shaped rail makes the movement of the forming cylinder more stable and less likely to deviate, and meanwhile, the design of embedding into the bottom plate 11 reduces the overall height of the forming cylinder and improves the space utilization.

[0042] The principle and implementation mode of the specific examples in the utility model are described, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A forming cylinder suitable for BJ technology, characterized in that: The utility model relates to a kind of forming cylinder, which comprises: a forming cylinder body (1) comprising a bottom plate (11), a piston (12) and a cylindrical shell (13), the bottom of the cylindrical shell (13) is fixedly connected with the bottom plate (11), the piston (12) is sealingly and slidably connected with the inner wall of the cylindrical shell (13), and the cylindrical shell (13) is axially provided with a sliding hole (14); a lifting mechanism (2) comprising a driving assembly (21) and a transmission rod (22), the fixed end of the driving assembly (21) is fixedly connected with the outer side wall of the cylindrical shell (13), one end of the transmission rod (22) is fixedly connected with the lifting end of the driving assembly (21), and the other end is fixedly connected with the piston (12) through the sliding hole (14); and a movable sealing mechanism (3) corresponding to the sliding hole (14), the movable sealing mechanism (3) comprises a steel belt (31) and a steel belt tensioning assembly (33), the steel belt (31) is arranged on the inner side of the cylindrical shell (13), the top end of the steel belt (31) is fixedly connected with the top end of the cylindrical shell (13), the other end passes through the gap between the piston (12) and the sliding hole (14) and is fixedly connected with the stretching end of the steel belt tensioning assembly (33), the fixed end of the steel belt tensioning assembly (33) is fixedly connected with the bottom plate (11), and the stretching end of the steel belt tensioning assembly (33) can tighten the steel belt (31) to seal the sliding hole (14) above the piston (12) during the downward sliding of the piston (12) or open the sliding hole (14) below the piston (12) during the upward movement of the piston (12) to enable the transmission rod (22) to slide in the sliding hole (14).

2. A forming cylinder suitable for BJ technology according to claim 1, characterized in that: The driving assembly (21) comprises a mounting seat (211), a servo motor (212), a ball screw (213) and a nut (214), the mounting seat (211) is fixedly connected to the bottom of the outer side wall of the cylindrical shell (13), the housing of the servo motor (212) is fixedly connected to the mounting seat (211), and the nut (214) is fixedly connected with the transmission rod (22); the ball screw (213) is arranged parallel to the direction of the piston and the bottom thereof is rotationally connected with the mounting seat (211), the nut (214) is threadedly sleeved on the outer side of the ball screw (213), and the output shaft of the servo motor is drivingly connected with the ball screw (213) through a transmission assembly to drive the nut (214) to move along the ball screw (213).

3. A forming cylinder suitable for BJ technology according to claim 2, characterized in that: The top of the cylindrical shell (13) is provided with an outwardly extending rim, and the top end of the ball screw (213) is rotationally connected with the rim.

4. A forming cylinder suitable for BJ technology according to claim 3, characterized in that: The side plate of the cylindrical shell (13) is provided with two sliding holes (14), the number of the transmission rods (22) is two, the two sliding holes (14) are symmetrically arranged about the ball screw (213), two sliding rails (25) are arranged on the outer side wall of the cylindrical shell (13), and the two sliding rails (25) are arranged outside the two sliding holes (14) and parallel to the sliding holes (14); the lifting mechanism (2) further comprises two connecting plates (23) and two lifting sliding blocks (24), the two connecting plates (23) are fixedly connected to the two sides of the nut (214), one end of the connecting plate (23) away from the nut (214) is fixedly connected with the lifting sliding block (24), the lifting sliding block (24) is in sliding connection with the sliding rail, one end of the transmission rod (22) is fixedly connected with the corresponding connecting plate (23), and the other end is fixedly connected with the piston (12) penetrating through the corresponding sliding hole (14).

5. A forming cylinder suitable for BJ technology according to claim 4, characterized in that: The side of the sliding rail (25) away from the cylindrical shell (13) is protruding, the lifting sliding block (24) is provided with a groove, and the protrusion is used for being embedded and fixed in the groove. Wherein, the width of the protrusion away from the cylindrical shell (13) is greater than the width close to the cylindrical shell (13), and the width of the groove opening is less than the width of the protrusion away from the cylindrical shell (13).

6. A forming cylinder suitable for BJ technology according to claim 5, characterized in that: The number of the lifting mechanism (2) is two, the two lifting mechanisms (2) are arranged outside the two opposite side walls of the cylindrical shell (13), the number of the corresponding sliding holes (14) is four, and the number of the movable sealing mechanisms (3) is the same as that of the sliding holes.

7. A forming cylinder suitable for BJ technology according to claim 1, characterized in that: The movable sealing mechanism (3) further comprises an arc-shaped guide (32), the bottom of the piston is provided with a connecting strip plate, the connecting strip plate is provided with a through hole, the bottom of the through hole is an arc-shaped part, one end of the transmission rod (22) extending into the cylindrical shell (13) is fixedly connected with the connecting strip plate, the top end of the arc-shaped guide (32) is fixedly connected with the bottom of the piston (12), and the bottom end of the arc-shaped guide (32) is located above the arc-shaped part to guide the steel belt (31) into the arc-shaped part.

8. A forming cylinder suitable for BJ technology according to claim 1, characterized in that: The steel belt tensioning assembly (33) comprises a tensioning seat (331), a guide rod (332), a tensioning sliding block (333) and a tensioning spring (334), the tensioning seat (331) is fixedly connected with the bottom plate (11), the guide rod (332) is arranged vertically to the bottom plate, the top end of the guide rod (332) is fixedly connected with the top end of the tensioning seat (331), the bottom end of the guide rod (332) is fixedly connected with the bottom end of the tensioning seat (331), the tensioning sliding block (333) is sleeved outside the guide rod (332) and is slidingly connected with the guide rod (332), the tensioning sliding block (333) is fixedly connected with the bottom end of the steel belt (31), the tensioning spring (334) is sleeved outside the guide rod (332), the top end of the tensioning spring (334) is fixedly connected with the top end of the tensioning seat (331), and the bottom end of the tensioning spring (334) is fixedly connected with the tensioning sliding block (333).

9. A forming cylinder suitable for BJ technology according to claim 1, characterized in that: Further comprising a driving motor (4), a gear (5), a rack, a double-track rail and a double-track wheel (6), the rack and the double-track rail are arranged on the workbench of the 3D printing device, the shell of the driving motor (4) is fixedly connected with the outer side wall of the cylindrical shell (13), the gear (5) is sleeved and fixed on the output shaft of the driving motor (4), the gear (5) is meshingly connected with the rack, and the double-track wheel (6) is used for rolling connection on the double-track rail.

10. A forming cylinder suitable for BJ technology according to claim 9, characterized in that: The double-track wheel (6) is a V-shaped wheel, the double-track rail is an inverted V-shaped structure matched with the V-shaped wheel, and the top of the double-track wheel (6) is embedded in the bottom plate (11).

Images