An adjustable constant force extrusion device

Abstract

This invention patent discloses an adjustable constant-force extrusion device, which includes a feeding component, two micro-feeding components and a nozzle component; during use, after the pulling and pressing force sensors in the two micro-feeding components compare the two measured extrusion forces with the two extrusion forces set by the user in the external control system of the device, they respectively control the micro-feeding linear motors in the micro-feeding components to move upward or downward to increase or decrease the moving speed of the ink cartridge piston rod, adjust the extrusion force, and ensure that the material is extruded with a constant extrusion force. This invention patent solves the problem of unstable extrusion force during the printing process, realizes a constant extrusion force during the printing process, and improves the printing accuracy; the two micro-feeding components are independent of each other, and different constant forces can be set respectively to perform extrusion printing at different speeds, improving the printing efficiency.

Description

Technical Field

[0001] This invention patent relates to the technical field of extrusion equipment in fluid extrusion 3D printing, and relates to an automatic control constant force extrusion device.

[0002] Background Art

[0003] Extrusion 3D printing technology extrudes printing materials onto a printing table under a certain pressure, and deposits the materials regularly according to the planned path. After layer-by-layer stacking, a three-dimensional entity is formed. The material curing method of this printing method can be photocuring, chemical curing, cooling curing, etc. This printing method is easy to operate, has a rich source of printable materials, and can achieve high-throughput printing. At the same time, this technology can achieve multi-material printing by configuring multiple nozzles. The extrusion-type printing technology has various advantages and is widely used in medical printing, architectural printing, etc., especially in biological 3D printing.

[0004] The extrusion pressure of extrusion-type 3D printing is mostly pneumatic extrusion and screw extrusion. However, pneumatic extrusion has high requirements for the overall pressure supply equipment. It requires extremely good overall airtightness to prevent air leakage from causing pressure changes, and pneumatic extrusion has a time delay. After the printing of the workpiece is completed, the residual gas in the air pressure pipe will also extrude more materials; while screw extrusion causes uneven extrusion of materials as the extrusion pressure of the materials changes continuously, affecting the printing accuracy and forming quality. Summary of the Invention

[0005] This invention patent aims to solve the problems of high time delay, uneven extrusion of materials, and poor running stability of existing devices and equipment, and proposes a new extrusion device for extrusion-type 3D printing that can overcome the above defects and improve extrusion accuracy. The specific technical solution is as follows:

[0006] An adjustable constant-force extrusion device, comprising a feeding assembly 1, a first micro-feeding assembly 2, a second micro-feeding assembly 3, and a nozzle assembly 4; wherein: The feeding assembly 1 includes a fixed bottom plate, a first support column, a second support column, a third support column, a fourth support column, a short support plate, a first long support plate, a second long support plate, a linear motor, a slide rail plate, a moving slide, and a fixing plate for the micro-feeding linear motor; The first micro-feeding assembly 2 includes a first micro-feeding linear motor, a first micro-feeding moving slide, a first V-shaped fixture, a second V-shaped fixture, a first fixture fixing rod, a first tension and compression sensor, a first piston push rod, and a first fixture cushion block; The second micro-feeding assembly 3 includes a second micro-feeding linear motor, a second micro-feeding moving slide, a third V-shaped fixture, a fourth V-shaped fixture, a second fixture fixing rod, a second tension and compression sensor, a second piston push rod, and a second fixture cushion block; The nozzle assembly 4 includes a first ink cartridge piston rod, a second ink cartridge piston rod, a first ink cartridge, a second ink cartridge, an upper ink cartridge fixing block, a lower ink cartridge fixing block, a temperature control board, a heat insulation board, a first hand-tightening screw, and a second hand-tightening screw; wherein: The linear motor, the first support column, the second support column, the third support column, the fourth support column, the short support plate, the first long support plate, and the second long support plate in the feeding assembly are all fixedly installed on the fixed bottom plate. The slide rail plate is supported on the fixed bottom plate by the short support plate and the first support column, the second support column, the third support column, and the fourth support column and is parallel to the movement track of the linear motor. The lower part of the moving slide is fixedly installed on the mover of the linear motor, and the upper part is connected to the fixing plate 2 for the micro-feeding linear motor; The first micro-feeding linear motor in the first micro-feeding assembly is fixed on the fixing plate 2 for the micro-feeding linear motor by bolts. The mover of the first micro-feeding linear motor is connected to the first micro-feeding moving slide. The first V-shaped fixture and the second V-shaped fixture are longitudinally fixed on the first micro-feeding moving slide. A fixture cushion block is installed at the tail of the first V-shaped fixture away from the nozzle assembly. The first fixture fixing rod is positioned and clamped by the first V-shaped fixture and the second V-shaped fixture to make the first fixture fixing rod parallel to the movement track of the first micro-feeding linear motor. One end face of the first fixture fixing rod close to the nozzle assembly is fixedly installed with the first tension and compression sensor, and the other end of the first tension and compression sensor is connected to the first piston push rod. The end of the first piston push rod abuts against the first ink cartridge piston rod; The connection method of each component of the second micro-feeding assembly is the same as that of the first micro-feeding assembly, that is, the second micro-feeding linear motor in the second micro-feeding assembly is fixed on the fixing plate 2 for the micro-feeding linear motor by bolts. The mover of the second micro-feeding linear motor is connected to the second micro-feeding moving slide. The third V-shaped fixture and the fourth V-shaped fixture are longitudinally fixed on the second micro-feeding moving slide. A fixture cushion block is installed at the tail of the third V-shaped fixture away from the nozzle assembly. The second fixture fixing rod is positioned and clamped by the third V-shaped fixture and the fourth V-shaped fixture to make the second fixture fixing rod parallel to the movement track of the second micro-feeding linear motor. One end face of the second fixture fixing rod close to the extrusion nozzle assembly is fixedly installed with the second tension and compression sensor, and the other end of the second tension and compression sensor is connected to the second piston push rod. The end of the second piston push rod abuts against the second ink cartridge piston rod.In the nozzle assembly 4, the ink cartridge piston rod one and the ink cartridge piston rod two are respectively inserted into the ink cartridge one and the ink cartridge two and then placed into the ink cartridge slots of the ink cartridge fixing block. The upper ink cartridge fixing block and the lower ink cartridge fixing block are tightened by hand-tightening screw one and hand-tightening screw two to form the ink cartridge fixing block. The lower ink cartridge fixing block is fixed on one side of the temperature control board, and the other side of the temperature control board is fixed to the heat insulation board. The heat insulation board is installed on the fixed bottom plate by connecting the long support plate one and the long support plate two with bolts.

[0007] The described adjustable constant-force extrusion device is characterized in that: the micro-feed linear motor one and the micro-feed linear motor two are longitudinally arranged on the micro-feed linear motor fixing plate 2, and the micro-feed linear motor one and the micro-feed linear motor two are parallel to the lower linear motor.

[0008] The described adjustable constant-force extrusion device is characterized in that: the V-shaped clamps one and two on the micro-feed moving slide one are longitudinally fixed on the micro-feed moving slide one to ensure that the clamped clamp fixing rod one is parallel to the track of the micro-feed linear motor one.

[0009] The described adjustable constant-force extrusion device is characterized in that: the V-shaped clamps three and four on the micro-feed moving slide two are longitudinally fixed on the micro-feed moving slide two to ensure that the clamped clamp fixing rod two is parallel to the track of the micro-feed linear motor two.

[0010] The described adjustable constant-force extrusion device is characterized in that: the clamp fixing rod one, the piston push rod one, and the ink cartridge piston rod one are coaxial.

[0011] The described adjustable constant-force extrusion device is characterized in that: the clamp fixing rod two, the piston push rod two, and the ink cartridge piston rod two are coaxial.

[0012] The described adjustable constant-force extrusion device is characterized in that: the two micro-feed components are independent of each other and can be set with different constant forces to perform extrusion printing at different speeds.

[0013] The described adjustable constant-force extrusion device is characterized in that: syringe needle chucks are provided at the upper part of the ink cartridge slots on the upper ink cartridge fixing block and the lower ink cartridge fixing block to fix the ink cartridge one and the ink cartridge two in the ink cartridge slots of the ink cartridge fixing block.

[0014] The described adjustable constant-force extrusion device is characterized in that: the ink cartridge one and the ink cartridge two are tightened and fixed by hand-tightening screw one and hand-tightening screw two on the upper ink cartridge fixing block and the lower ink cartridge fixing block.

[0015] The described adjustable constant-force extrusion device is characterized in that: the temperature control board can adjust the temperature of the nozzle assembly, and the adjustment range is -10°C - 80°C.

[0016] Compared with the prior art, the beneficial effects of this invention patent are:

[0017] 1. Abandon the traditional pneumatic extrusion method. If traditional pressure supply equipment provides a constant air pressure, it needs to continuously pressurize. This device avoids energy waste and reduces the danger of experimental equipment.

[0018] 2. Solve the problem of unstable extrusion force during the printing process, achieve a constant extrusion force during the printing process, and improve the printing accuracy.

[0019] 3. Avoid the delay of pneumatic extrusion, that is, stop immediately when turned off, and avoid waste of experimental materials.

[0020] 4. The piston push rod one and the piston push rod two can control the material extrusion with different forces respectively to meet different printing requirements. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the three-dimensional structure components of the embodiment of the present invention patent

[0022] Figure 2 Schematic diagram of the three-dimensional structure of the embodiment of the present invention patent

[0023] Figure 3 is Figure 2 the front view of the shown embodiment

[0024] Figure 4 is Figure 2 the left view of the shown embodiment

[0025] Figure 5 is Figure 2 the top view of the shown embodiment

[0026] In the figure:

[0027] 1 First-level feeding component, 2 First micro-feeding component, 3 Second micro-feeding component, 4 Nozzle component, 1-1 Fixed bottom plate, 1-2 First support column, 1-3 Second support column, 1-4 Third support column, 1-5 Fourth support column, 1-6 Short support plate, 1-7 First long support plate, 1-8 Second long support plate, 1-9 Linear motor, 1-10 Slide rail plate, 1-11 Moving slide, 1-12 Fixed plate for micro-feeding linear motor, 2-1 First micro-feeding linear motor, 2-2 First micro-feeding moving slide, 2-3 First V-shaped fixture, 2-4 Second V-shaped fixture, 2-5 First fixture fixing rod, 2-6 First tension and compression sensor, 2-7 First piston push rod, 2-8 Fixture cushion block, 3-1 Second micro-feeding linear motor, 3-2 Second micro-feeding moving slide, 3-3 Third V-shaped fixture, 3-4 Fourth V-shaped fixture, 3-5 Second fixture fixing rod, 3-6 Second tension and compression sensor, 3-7 Second piston push rod, 3-8 Fixture cushion block, 4-1 First ink cartridge piston rod, 4-2 Second ink cartridge piston rod, 4-3 First ink cartridge, 4-4 Second ink cartridge, 4-5 Upper ink cartridge fixing block, 4-6 Lower ink cartridge fixing block, 4-7 Temperature control plate, 4-8 Heat insulation plate, 4-9 First hand-tightening screw, 4-10 Second hand-tightening screw.

[0028] Figure 6 is the process flow chart of the embodiment of the present invention for invention patent Detailed implementation manners

[0029] The attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent; for better illustration of this embodiment, some parts in the attached drawings are omitted and do not represent the dimensions of the actual product; for those skilled in the relevant art, some well-known structures are understandable. The positional relationships described in the attached drawings are only for illustrative purposes and should not be construed as the design of this patent

[0030] In Figures 1-5The illustrated embodiment includes an adjustable constant-force extrusion device, which includes a feeding assembly 1, a first micro-feeding assembly 2, a second micro-feeding assembly 3, and a nozzle assembly 4; wherein: The feeding assembly 1 includes a fixed bottom plate 1-1, a first support column 1-2, a second support column 1-3, a third support column 1-4, a fourth support column 1-5, a short support plate 1-6, a first long support plate 1-7, a second long support plate 1-8, a linear motor 1-9, a slide rail plate 1-10, a moving slide 1-11, and a fixing plate 1-12 for the micro-feeding linear motor; The first micro-feeding assembly 2 includes a first micro-feeding linear motor 2-1, a first micro-feeding moving slide 2-2, a first V-shaped fixture 2-3, a second V-shaped fixture 2-4, a first fixture fixing rod 2-5, a first tension and compression sensor 2-6, a first piston push rod 2-7, and a first fixture cushion block 2-8; The second micro-feeding assembly 3 includes a second micro-feeding linear motor 3-1, a second micro-feeding moving slide 3-2, a third V-shaped fixture 3-3, a fourth V-shaped fixture 3-4, a second fixture fixing rod 3-5, a second tension and compression sensor 3-6, a second piston push rod 3-7, and a second fixture cushion block 3-8; The nozzle assembly 4 includes a first ink cartridge piston rod 4-1, a second ink cartridge piston rod 4-2, a first ink cartridge 4-3, a second ink cartridge 4-4, an upper ink cartridge fixing block 4-5, a lower ink cartridge fixing block 4-6, a temperature control plate 4-7, a heat insulation plate 4-8, a first hand-tightening screw 4-9, and a second hand-tightening screw 4-10; wherein: The linear motor 1-9, the first support column 1-2, the second support column 1-3, the third support column 1-4, the fourth support column 1-5, the short support plate 1-6, the first long support plate 1-7, and the second long support plate 1-8 in the feeding assembly are all fixedly installed on the fixed bottom plate 1-1. The slide rail plate 1-10 is supported on the fixed bottom plate 1-1 by the short support plate 1-6 and the first support column 1-2, the second support column 1-3, the third support column 1-4, and the fourth support column 1-5 and is parallel to the moving track of the linear motor 1-9. The lower part of the moving slide 1-11 is fixed on the mover of the linear motor 1-9, and the upper part is connected to the fixing plate 1-12 for the micro-feeding linear motor; The first micro-feeding linear motor 2-1 in the first micro-feeding assembly is fixed on the fixing plate 1-12 for the micro-feeding linear motor by bolts. The mover of the first micro-feeding linear motor 2-1 is connected to the first micro-feeding moving slide 2-2. The first V-shaped fixture 2-3 and the second V-shaped fixture 2-4 are longitudinally fixed on the first micro-feeding moving slide 2-2. A fixture cushion block 2-8 is installed at the tail of the first V-shaped fixture 2-3 away from the nozzle assembly. The first fixture fixing rod 2-5 is positioned and clamped by the first V-shaped fixture 2-3 and the second V-shaped fixture 2-4 to make the first fixture fixing rod 2-5 parallel to the moving track of the first micro-feeding linear motor 2-1. One end face of the first fixture fixing rod 2-5 close to the nozzle assembly is fixedly provided with the first tension and compression sensor 2-6, and the other end of the first tension and compression sensor 2-6 is connected to the first piston push rod 2-7. The end of the first piston push rod abuts against the first ink cartridge piston rod 4-1;The connection methods of the components of the second micro-feed assembly are the same as those of the first micro-feed assembly. That is, the second micro-feed linear motor 3-1 in the second micro-feed assembly is fixed on the micro-feed linear motor fixing plate 1-12 by bolts. The mover of the second micro-feed linear motor 3-1 is connected to the second micro-feed moving slide 3-2. The third V-shaped fixture 3-3 and the fourth V-shaped fixture 3-4 are longitudinally fixed on the second micro-feed moving slide 3-2. A fixture spacer block 3-8 is installed at the tail of the third V-shaped fixture 3-3 away from the nozzle assembly. The second fixture fixing rod 3-5 is positioned and clamped by the third V-shaped fixture 3-3 and the fourth V-shaped fixture 3-4 so that the second fixture fixing rod 3-5 is parallel to the moving track of the second micro-feed linear motor 3-1. One end face of the second fixture fixing rod 3-5 close to the extrusion nozzle assembly is fixed with the second tensile and compressive force sensor 3-6. The other end of the second tensile and compressive force sensor 3-6 is connected to the second piston push rod 3-7. The end of the second piston push rod abuts against the second ink cartridge piston rod 4-2. In the nozzle assembly 4, the first ink cartridge piston rod 4-1 and the second ink cartridge piston rod 4-2 are respectively inserted into the first ink cartridge 4-3 and the second ink cartridge 4-4 and then placed in the ink cartridge slots of the ink cartridge fixing block. The upper ink cartridge fixing block 4-5 and the lower ink cartridge fixing block 4-6 are tightened by the first hand-tightening screw 4-9 and the second hand-tightening screw 4-10 to form the ink cartridge fixing block. The lower ink cartridge fixing block 4-6 is fixed on one side of the temperature control board 4-7. The other side of the temperature control board 4-7 is fixed to the heat insulation board 4-8. The heat insulation board 4-8 is installed on the fixed bottom plate 1-1 by bolts through the first long support plate 1-7 and the second long support plate 1-8.;

[0031] Before use, after the first ink cartridge 4-3 and the second ink cartridge 4-4 are filled with printing materials, they are fixed in the ink cartridge fixing block by the first hand-tightening screw (4-9) and the second hand-tightening screw (4-10). The user inputs the first extrusion force and the second extrusion force into the external control system and sets the temperature of the temperature control board 4-7. When starting the extrusion printing, the external controller controls the mover of the linear motor 1-9 according to the input extrusion force to drive the moving slide 1-11 and the first micro-feed assembly 2 and the second micro-feed assembly 3 on the moving slide 1-11 to move downward, so that the first piston push rod 2-7 and the second piston push rod 3-7 push the first ink cartridge piston 4-1 and the second ink cartridge piston 4-2 to extrude the printing materials in the first ink cartridge 4-3 and the second ink cartridge 4-4 respectively for extrusion printing. The reaction forces of the extrusion printing are respectively transmitted upward through the first ink cartridge piston 4-1 and the second ink cartridge piston 4-2 to the first tensile and compressive force sensor 2-6 and the second tensile and compressive force sensor 3-6 at the upper ends of the first piston push rod 2-7 and the second piston push rod 3-7. The first tensile and compressive force sensor 2-6 compares the measured extrusion force with the first extrusion force set by the user in the external control system of the device after filtering and noise reduction processing. The second tensile and compressive force sensor 3-6 compares the measured extrusion force with the second extrusion force set by the user in the external control system of the device after filtering and noise reduction processing.

[0032] When the extrusion force measured by the tensile and compressive force sensor 2-6 is less than the first extrusion force set by the user, the external controller controls the mover of the micro-feed linear motor 2-1 in the micro-feed assembly 1 to move downward to increase the downward movement speed of the piston push rod 2-7 and appropriately increase the extrusion force; when the measured extrusion force is greater than the first extrusion force set by the user, the external controller controls the mover of the micro-feed linear motor 2-1 in the micro-feed assembly 1 to move upward to reduce the downward movement speed of the piston push rod 2-7 and appropriately reduce the extrusion force. When the extrusion force measured by the tensile and compressive force sensor 2-6 is equal to the first extrusion force set by the user, the external controller controls the micro-feed linear motor 2-1 in the micro-feed assembly 1 not to act. The linear motor 1-9 in the feed assembly 1 and the micro-feed linear motor 2-1 in the micro-feed assembly 2 work together to finally achieve precise control of the extrusion force during printing, so that the extrusion force during the extrusion printing of the ink cartridge 4-3 is always equal to the first extrusion force set by the user.

[0033] While the micro-feed assembly 2 is operating, the micro-feed assembly 3 operates simultaneously to control the movement of the piston push rod 3-7 in the same way. That is, when the extrusion force measured by the tensile and compressive force sensor 3-6 is less than the second extrusion force set by the user, the external controller controls the mover of the micro-feed linear motor 3-1 in the micro-feed assembly 2 to move downward to increase the downward movement speed of the piston push rod 3-7 and appropriately increase the extrusion force; when the measured extrusion force is greater than the second extrusion force set by the user, the external controller controls the mover of the micro-feed linear motor 3-1 in the micro-feed assembly 2 to move upward to reduce the downward movement speed of the piston push rod 3-7 and appropriately reduce the extrusion force. When the extrusion force measured by the tensile and compressive force sensor 3-6 is equal to the second extrusion force set by the user, the external controller controls the micro-feed linear motor 3-1 in the micro-feed assembly 2 not to act. The linear motor 1-9 in the feed assembly 1 and the micro-feed linear motor 3-1 in the micro-feed assembly 2 work together to finally achieve precise control of the extrusion force during printing, so that the extrusion force during the extrusion printing of the ink cartridge 4-4 is always equal to the second extrusion force set by the user. The two micro-feed assemblies are independent of each other and control the pistons of the two ink cartridges to perform constant-force extrusion printing according to different extrusion forces set by the user.

[0034] This invention patent is not limited to the above examples. Equivalent changes and improvements made by those of ordinary skill in the art in this invention all fall within the scope covered by this invention.

Claims

1. An adjustable constant-force extrusion device, comprising a feeding component (1), a first micro-feeding component (2), a second micro-feeding component (3), and a nozzle component (4); Wherein: The feeding assembly (1) includes a fixed bottom plate (1-1), a first support column (1-2), a second support column (1-3), a third support column (1-4), a fourth support column (1-5), a short support plate (1-6), a first long support plate (1-7), a second long support plate (1-8), a linear motor (1-9), a slide rail plate (1-10), a moving slide (1-11), and a micro-feeding linear motor fixing plate (1-12); the first micro-feeding assembly (2) includes a first micro-feeding linear motor (2-1), a first micro-feeding moving slide (2-2), a first V-shaped fixture (2-3), a second V-shaped fixture (2-4), a first fixture fixing rod (2-5), a first tension and compression sensor (2-6), a first piston push rod (2-7), and a first fixture cushion block (2-8); the second micro-feeding assembly (3) includes a second micro-feeding linear motor (3-1), a second micro-feeding moving slide (3-2), a third V-shaped fixture (3-3), a fourth V-shaped fixture (3-4), a second fixture fixing rod (3-5), a second tension and compression sensor (3-6), a second piston push rod (3-7), and a second fixture cushion block (3-8); the nozzle assembly (4) includes a first ink cartridge piston rod (4-1), a second ink cartridge piston rod (4-2), a first ink cartridge (4-3), a second ink cartridge (4-4), an upper ink cartridge fixing block (4-5), a lower ink cartridge fixing block (4-6), a temperature control board (4-7), a heat insulation board (4-8), a first hand-tightening screw (4-9), and a second hand-tightening screw (4-10); wherein: the linear motor (1-9), the first support column (1-2), the second support column (1-3), the third support column (1-4), the fourth support column (1-5), the short support plate (1-6), the first long support plate (1-7), and the second long support plate (1-8) in the feeding assembly are all fixedly installed on the fixed bottom plate (1-1), the slide rail plate (1-10) is supported on the fixed bottom plate (1-1) by the short support plate (1-6) and the first support column (1-2), the second support column (1-3), the third support column (1-4), and the fourth support column (1-5) and is parallel to the movement track of the linear motor (1-9), the lower part of the moving slide (1-11) is fixed on the mover of the linear motor (1-9), and the upper part is connected to the micro-feeding linear motor fixing plate (1-12);The micro-feed linear motor 1 (2-1) in the micro-feed assembly 1 is fixed to the micro-feed linear motor fixing plate (1-12) by bolts. The mover of the micro-feed linear motor 1 (2-1) is connected to the micro-feed moving slide 1 (2-2). The V-shaped fixture 1 (2-3) and the V-shaped fixture 2 (2-4) are longitudinally fixed to the micro-feed moving slide 1 (2-2). A fixture spacer 1 (2-8) is installed at the tail of the V-shaped fixture 1 (2-3) away from the nozzle assembly. The fixture fixing rod 1 (2-5) is positioned and clamped by the V-shaped fixture 1 (2-3) and the V-shaped fixture 2 (2-4) so that the fixture fixing rod 1 (2-5) is parallel to the moving track of the micro-feed linear motor 1 (2-1). A tensile and compressive force sensor 1 (2-6) is fixed to the end face of the fixture fixing rod 1 (2-5) near the nozzle assembly. The other end of the tensile and compressive force sensor 1 (2-6) is connected to the piston push rod 1 (2-7). The end of the piston push rod 1 abuts against the ink cartridge piston rod 1 (4-1). The connection methods of the components in the micro-feed assembly 2 are the same as those in the micro-feed assembly 1, that is, the micro-feed linear motor 2 (3-1) in the micro-feed assembly 2 is fixed to the micro-feed linear motor fixing plate (1-12) by bolts. The mover of the micro-feed linear motor 2 (3-1) is connected to the micro-feed moving slide 2 (3-2). The V-shaped fixture 3 (3-3) and the V-shaped fixture 4 (3-4) are longitudinally fixed to the micro-feed moving slide 2 (3-2). A fixture spacer 2 (3-8) is installed at the tail of the V-shaped fixture 3 (3-3) away from the nozzle assembly. The fixture fixing rod 2 (3-5) is positioned and clamped by the V-shaped fixture 3 (3-3) and the V-shaped fixture 4 (3-4) so that the fixture fixing rod 2 (3-5) is parallel to the moving track of the micro-feed linear motor 2 (3-1). A tensile and compressive force sensor 2 (3-6) is fixed to the end face of the fixture fixing rod 2 (3-5) near the extrusion nozzle assembly. The other end of the tensile and compressive force sensor 2 (3-6) is connected to the piston push rod 2 (3-7). The end of the piston push rod 2 abuts against the ink cartridge piston rod 2 (4-2). In the nozzle assembly (4), the ink cartridge piston rod 1 (4-1) and the ink cartridge piston rod 2 (4-2) are respectively inserted into the ink cartridge 1 (4-3) and the ink cartridge 2 (4-4) and then placed in the ink cartridge slots of the ink cartridge fixing block. The upper ink cartridge fixing block (4-5) and the lower ink cartridge fixing block (4-6) are tightened by the hand-tightening screw 1 (4-9) and the hand-tightening screw 2 (4-10) to form the ink cartridge fixing block. The lower ink cartridge fixing block (4-6) is fixed to one side of the temperature control board (4-7). The other side of the temperature control board (4-7) is fixed to the heat insulation board (4-8). The heat insulation board (4-8) is installed on the fixed bottom plate (1-1) by bolts connected with the long support plate 1 (1-7) and the long support plate 2 (1-8).; 2. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The first micro-feeding linear motor (2-1) and the second micro-feeding linear motor (3-1) are longitudinally arranged on the micro-feeding linear motor fixing plate (1-12), and the first micro-feeding linear motor (2-1) and the second micro-feeding linear motor (3-1) are parallel to the lower linear motor (1-9).

3. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The first V-shaped fixture (2-3) and the second V-shaped fixture (2-4) on the first micro-feeding moving slide (2-2) are longitudinally fixed on the first micro-feeding moving slide (2-2) to ensure that the clamped fixture fixing rod one (2-5) is parallel to the track of the first micro-feeding linear motor (2-1).

4. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The third V-shaped fixture (3-3) and the fourth V-shaped fixture (3-4) on the second micro-feeding moving slide (3-2) are longitudinally fixed on the second micro-feeding moving slide (3-2) to ensure that the clamped fixture fixing rod two (3-5) is parallel to the track of the second micro-feeding linear motor (3-1).

5. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The fixture fixing rod one (2-5), the piston push rod one (2-7), and the ink cartridge piston rod one (4-1) are coaxial.

6. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The fixture fixing rod two (3-5), the piston push rod two (3-7), and the ink cartridge piston rod two (4-2) are coaxial.

7. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The two micro-feeding components are independent of each other, and different constant forces can be set respectively to perform extrusion printing at different speeds.

8. The adjustable constant-force extrusion device according to claim 1, Characterized in that: Needle tube chucks are provided at the upper part of the ink cartridge slots on the upper ink cartridge fixing block (4-5) and the lower ink cartridge fixing block (4-6) to fix the first ink cartridge (4-3) and the second ink cartridge (4-4) in the ink cartridge slots of the ink cartridge fixing block.

9. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The upper ink cartridge fixing block (4-5) and the lower ink cartridge fixing block (4-6) tighten and fix the first ink cartridge (4-3) and the second ink cartridge (4-4) by hand-tightening screws one (4-9) and two (4-10).

10. The adjustable constant-force extrusion device according to claim 1, Characterized in that: The temperature control board can adjust the temperature of the nozzle component, and the adjustment range is -10°C - 80°C.

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