A rolling device for multi-tow fiber 3D printing

Abstract

The present invention relates to a rolling device for multi-tow fiber 3D printing, which comprises a guide compacting block and a rolling wheel. The guide compacting block can move toward or away from an external printing platform. The guide compacting block has a guide part and a compacting part. The guide part is provided with a plurality of guide grooves arranged side by side. An external laser beam can heat the fiber bundle in one end of the guide groove close to the compacting part. The compacting part faces the external printing platform. The compacting part is provided with a mounting groove and a plurality of pre-pressing grooves. Any guide groove is connected with the mounting groove through a pre-pressing groove. The fiber bundle is transmitted through the guide groove, the pre-pressing groove and the mounting groove in turn. The rolling wheel is rotatably arranged in the mounting groove to compact the fiber bundle on the external printing platform. The problem that the prior art solves the problem that, when performing multi-tow printing, due to the bending of the bundles, the plurality of bundles are easily arranged irregularly or even misaligned during the rolling process, thereby affecting the molding quality of fiber parts, is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a rolling device for multi-tow fiber 3D printing. Background Art

[0002] 3D printing carbon fiber is the second most sought after additive manufacturing technology after metal. Thanks to the latest developments in the field of additive manufacturing, people have finally realized the reality of being able to print with a variety of elusive materials. An important factor affecting the molding quality and performance of 3D printed carbon fiber parts is the compaction quality of the fiber material during the printing process, which directly affects the molding and quality of the material.

[0003] Although carbon fiber has a wide range of applications in the field of 3D printing, most of the current 3D carbon fiber printing still uses a single tow for printing, which affects printing efficiency. In the existing equipment that uses multiple tows for printing, the fiber tows will bend at a certain angle during the printing process, resulting in irregular arrangement of the multiple tows during rolling. They will not be printed in parallel according to the set line width, and even serious misalignment will occur, which greatly affects the molding quality of the fiber parts and cannot reflect the excellent performance of the fiber material.

[0004] Therefore, in the prior art, when performing multi-tow printing, due to the bending of the tows, the multiple tows are prone to irregular arrangement or even misalignment during the rolling process, thereby affecting the molding quality of the fiber parts. Summary of the invention

[0005] In view of this, it is necessary to provide a rolling device for multi-tow fiber 3D printing to solve the problem in the prior art that when performing multi-tow printing, due to the bending of the tows, multiple tows are easily arranged irregularly or even misplaced during the rolling process, thus affecting the molding quality of fiber parts.

[0006] The present invention provides a rolling device for multi-tow fiber 3D printing, comprising a guide compacting block and a rolling wheel, wherein the guide compacting block can move toward or away from an external printing platform, the guide compacting block has a guide portion and a compacting portion, the guide portion is provided with a plurality of guide grooves arranged side by side, the plurality of guide grooves correspond one-to-one to a plurality of fiber bundles, an external laser beam can heat the fiber bundles in one end of the guide groove close to the compacting portion, the compacting portion faces the external printing platform, the compacting portion is provided with an installation groove and a plurality of pre-pressing grooves, the depth dimension of the pre-pressing groove is smaller than the diameter dimension of the fiber bundle, the plurality of pre-pressing grooves correspond one-to-one to the plurality of guide grooves, and any one of the guide grooves is connected to the installation groove through a pre-pressing groove, the fiber bundles are transmitted sequentially through the guide groove, the pre-pressing groove and the installation groove, and the rolling wheel is rotatably arranged in the installation groove to compact the fiber bundles on the external printing platform.

[0007] Furthermore, the guide compacting block includes an unheated guide block, an insulating guide block and a heated guide block which are fixedly connected in sequence along the transmission direction of the fiber bundle, and the unheated guide block, the insulating guide block and the heated guide block are located on the same plane and are recessed at one end to form the guide part, and the guide groove is opened in the recessed part of the guide part, the heated guide block is facing the external printing platform, and the side wall of the heated guide block close to the external printing platform is the compacting part, and a heating component is arranged in the heated guide block to heat the heated guide block.

[0008] Furthermore, a guide slot cover is fixedly provided at the recess of the unheated guide block to close the guide slot on the unheated guide block.

[0009] Furthermore, the depth component of the guide groove becomes smaller along the transmission direction of the fiber bundle, the depth dimension of the guide groove on the heating guide block is half of the diameter dimension of the fiber bundle, and the fiber bundle on the heating guide block is partially exposed outside the guide groove to facilitate heating by an external laser beam.

[0010] Furthermore, the pre-pressing groove has the same depth dimension as the guide groove on the heating guide block, and the connection between the pre-pressing groove and the guide groove is rounded.

[0011] Furthermore, the heating assembly includes a first heating rod and a second heating rod, the first heating rod is inserted into the heating guide block, and the second heating rod serves as a rotating shaft of the rolling wheel and is rotatably connected to the inner wall of the mounting groove.

[0012] Furthermore, the heating component also includes a thermocouple temperature sensor and a thermistor temperature sensor, and the thermocouple temperature sensor and the thermistor temperature sensor are both fixedly arranged in the heating guide block and are used to detect temperatures within different temperature ranges respectively.

[0013] The above-mentioned rolling device for multi-tow fiber 3D printing also includes a constant pressure component, which includes a pressure sensor and an electric cylinder. The electric cylinder is fixedly connected to the guide compacting block via the pressure sensor, and can drive the guide compacting block to move toward or away from the external printing platform. The pressure sensor is electrically connected to the electric cylinder for controlling the movement direction of the electric cylinder in real time.

[0014] The above-mentioned rolling device for multi-tow fiber 3D printing also includes a retractable protection component, and the pressure sensor is connected to the guide compaction block through the protection component. When the pressure on the protection component exceeds the set value, it contracts to relieve the pressure of the electric cylinder on the guide compaction block.

[0015] Furthermore, the protection component includes a connecting plate, a connecting block, two connecting columns and two rigid springs. The connecting plate is fixedly connected to the pressure sensor, and the connecting block is fixedly connected to the guide compacting block. The connecting block is provided with sliding holes corresponding to the connecting columns one by one. One end of the two connecting columns is fixedly connected to the connecting plate, and the other end is inserted into the sliding hole. The connecting block can slide along the axial direction of the connecting column, and the two rigid springs are respectively sleeved on the outer circumference of the two connecting columns.

[0016] Compared with the prior art, the present invention provides a rolling device for multi-tow fiber 3D printing, which limits the relative position of the multi-tow fibers in the guide groove during transmission by setting a guide groove on the guide compacting block, and uses a laser to heat the fiber bundle in the guide groove close to one end of the pre-pressing groove to transform the bundle into a straight state, so as to ensure that multiple bundles enter the pre-pressing groove in parallel, and further limit the relative position of the multi-tow fibers by the pre-pressing groove. At the same time, since the depth of the pre-pressing groove is smaller than the diameter of the fiber bundle, the fiber bundle will be partially exposed outside the pre-pressing groove. Under the extrusion of the pre-pressing groove and the printing platform, the fiber bundle can be pre-pressed and fixed on the printing platform, which is convenient for further compaction by the subsequent rolling wheel, and avoids the occurrence of irregular arrangement or dislocation of the multi-tow fibers during the rolling process, thereby improving the compaction quality of the fiber material as well as the molding and quality of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a rolling device for multi-tow fiber 3D printing provided by the present invention in this embodiment;

[0018] Figure 2 A schematic diagram of the overall structure of the guide compacting block in one embodiment of the rolling device for multi-tow fiber 3D printing provided by the present invention;

[0019] Figure 3 A schematic diagram of the installation positions of a constant pressure component and a protective component in one embodiment of a rolling device for multi-tow fiber 3D printing provided by the present invention.

[0020] In the figure: 1. guide compacting block; 2. rolling wheel; 3. constant pressure assembly; 4. protection assembly; 11. guide part; 12. compacting part; 13. unheated guide block; 14. heat-insulating guide block; 15. heating guide block; 111. guide groove; 112. guide groove cover; 121. mounting groove; 122. pre-pressing groove; 151. heating assembly; 1511. first heating rod; 1512. second heating rod; 1513. thermocouple temperature sensor; 1514. thermistor temperature sensor; 31. pressure sensor; 32. electric cylinder; 41. connecting plate; 42. connecting block; 43. connecting column; 44. rigid spring; 421. sliding hole. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0022] like Figure 1 and 2 As shown, a rolling device for multi-tow fiber 3D printing in this embodiment includes a guide compacting block 1 and a rolling wheel 2. The guide compacting block 1 can move toward or away from the external printing platform. The guide compacting block 1 has a guide portion 11 and a compacting portion 12. The guide portion 11 is provided with a plurality of guide grooves 111 arranged side by side. The plurality of guide grooves 111 correspond to the plurality of fiber bundles one by one. The external laser beam can heat the fiber bundles in one end of the guide groove 111 close to the compacting portion 12. The compacting portion 12 is facing outward. The compacting portion 12 is provided with a mounting groove 121 and a plurality of pre-pressing grooves 122. The depth of the pre-pressing groove 122 is smaller than the diameter of the fiber bundle. The plurality of pre-pressing grooves 122 correspond to the plurality of guide grooves 111 one by one, and any guide groove 111 is connected with the mounting groove 121 through a pre-pressing groove 122. The fiber bundle is transmitted through the guide groove 111, the pre-pressing groove 122 and the mounting groove 121 in sequence. The rolling wheel 2 is rotatably arranged in the mounting groove 121 to compact the fiber bundle on the external printing platform.

[0023] Among them, the guide compacting block 1 is mainly used to limit the relative position of the multi-tow fibers during the transmission process to avoid the multi-tow fibers from being disordered before rolling and affecting the compaction quality. Specifically, the guide compacting block 1 has a guide part 11 and a compacting part 12. The guide part 11 is provided with a plurality of guide grooves 111 for keeping the multi-tow fibers neat during the transmission process. The plurality of guide grooves 111 are arranged one-to-one with the plurality of fiber bundles, so that each fiber bundle is restricted by a guide groove 111 to avoid the fiber bundles from being staggered. At one end of the guide groove 111 close to the compacting part 12, an external laser beam is provided to heat the fiber bundle in the guide groove 111. The state of the heated fiber bundle will change to a straight line to ensure that the plurality of fiber bundles enter the pre-pressing groove 122 in parallel. The depth dimension of the pre-pressing groove 122 is smaller than the diameter dimension of the fiber bundle. , the fiber bundles will be partially exposed outside the pre-pressing groove 122. By driving the guide compacting block 1 to move toward the external printing platform, the multi-tow fibers in the pre-pressing groove 122 can be neatly pre-pressed and fixed on the printing platform, so as to facilitate the subsequent further compaction by the rolling wheel 2; the rolling wheel 2 is a structure for compacting and fixing the multi-tow fibers on the printing platform. The rolling wheel 2 is rotatably set in the installation groove 121 opened on the compacting part 12, and can roll the fiber bundles passing through the notch position of the installation groove 121, so as to further compact the pre-compacted fiber bundles on the printing platform to complete the entire compaction operation. In the above compaction process, due to the limiting effect of the guide groove 111 and the pre-compacting of the pre-pressing groove 122, the multi-tow fibers are always regularly arranged, avoiding the situation of fiber bundle dislocation during the rolling and compacting process, thereby improving the compaction quality of the fiber material during printing.

[0024] It should be noted that, in the present embodiment, the peripheral wall of the rolling wheel 2 slightly protrudes from the notch of the mounting groove 121, and when rolling, the contact point with the fiber bundle is located on the plane of the compacting part 12 closest to the printing platform, so as to avoid other structures on the compacting part 12 hindering the rolling of the fiber bundle by the rolling wheel 2.

[0025] In this embodiment, the guide compacting block 1 includes a guide portion 11 and a compacting portion 12, wherein the guide portion 11 is provided with a guide groove 111, which mainly serves to limit the relative position of multiple fiber bundles, and the compacting portion 12 is provided with a pre-compacting groove 122 for pre-compacting and an installation groove 121 for installing a rolling wheel 2. In order to better limit the relative positions between multiple fiber bundles, arrange them neatly, and pre-compact multiple fiber bundles neatly on the printing platform, in the following embodiments, the structure of the guide compacting block 1 is optimized as follows.

[0026] In order to ensure the smooth transportation and compaction operations of multi-tow fibers, in a preferred embodiment, the guide compacting block 1 includes an unheated guide block 13, an insulating guide block 14 and a heating guide block 15 which are fixedly connected in sequence along the transmission direction of the fiber bundles. The unheated guide block 13, the insulating guide block 14 and the heating guide block 15 are located on the same plane and one end is recessed to form a guide portion 11. The guide groove 111 is opened in the recessed portion of the guide portion 11. The heating guide block 15 is facing the external printing platform. The side wall of the heating guide block 15 close to the external printing platform is the compaction portion 12. A heating component 151 is arranged in the heating guide block 15 to heat the heating guide block 15.

[0027] Among them, a heating component 151 is provided in the heating guide block 15, and the heating component 151 is used to heat the heating guide block 15, so that the guide groove 111 and the compacting part 12 on the heating guide block 15 maintain a certain temperature, avoid the temperature of the multi-fiber bundle after laser heating to drop suddenly, so that it maintains a certain viscosity at high temperature, which is convenient for subsequent pre-compacting and compacting operations. The insulation guide block 14 is set to block heat transfer to reduce the temperature in the guide groove 111 on the unheated guide block 13, avoid the temperature is too high The multi-fiber bundle produces viscosity, which affects the smooth transmission of the multi-fiber bundle in the groove of the unheated guide block 13.

[0028] In order to better limit the relative positions of the plurality of fiber bundles, in a preferred embodiment, Figure 1 As shown, a guide slot cover 112 is fixedly provided at the recess of the unheated guide block 13 to close the guide slot 111 on the unheated guide block 13 .

[0029] Among them, the guide groove cover 112 is fixedly connected to the unheated guide block 13 via screws (not shown in the figure). The guide groove cover 112 is provided to close the notch of the guide groove 111 on the unheated guide block 13, restricting the fiber bundle in the guide groove 111 to prevent it from escaping from the guide groove 111.

[0030] In order to facilitate heating of the plurality of fiber bundles, in a preferred embodiment, Figure 1 and 2 As shown, the depth component of the guide groove 111 becomes smaller along the transmission direction of the fiber bundle, the depth dimension of the guide groove 111 on the heating guide block 15 is half of the diameter dimension of the fiber bundle, and the fiber bundle on the heating guide block 15 is partially exposed outside the guide groove 111 to facilitate heating by an external laser beam.

[0031] Among them, the gradual setting of the depth of the guide groove 111 allows the fiber bundles to enter the guide groove 111 more easily. At the same time, the depth dimension setting of the guide groove 111 on the heating guide block 15 is to make the fiber bundles on the heating guide block 15 partially exposed outside the guide groove 111, so as to facilitate the laser to heat multiple fiber bundles.

[0032] In a preferred embodiment, the pre-pressing groove 122 has the same depth as the guide groove 111 on the heating guide block 15 , and the connection between the pre-pressing groove 122 and the guide groove 111 is rounded.

[0033] The guide groove 111 on the heating guide block 15 can be integrally formed with the pre-pressing groove 122, and the rounded corner at the connecting point facilitates the fiber bundle to enter the pre-pressing groove 122 and avoids the corner from exerting pressure on the fiber bundle to cause it to bend.

[0034] In order to smoothly carry out the compaction operation, in a preferred embodiment, the heating assembly 151 includes a first heating rod 1511 and a second heating rod 1512. The first heating rod 1511 is inserted into the heating guide block 15, and the second heating rod 1512 serves as the rotating shaft of the rolling wheel 2 and is rotatably connected to the inner wall of the mounting groove 121.

[0035] Among them, the first heating rod 1511 and the second heating rod 1512 are used to heat the heating guide block 15 and the rolling wheel 2 respectively, so that the fiber bundle can be kept within a certain temperature range during the pre-pressing and rolling operations to ensure the smooth progress of the pre-pressing and compacting operations. It should be noted that the second heating rod 1512 is also used as the rotating shaft of the rolling wheel 2. The two ends of the second heating rod 1512 are rotatably connected to the side wall of the mounting groove 121 via a deep groove ball bearing (not shown in the figure), and the deep groove ball bearing is embedded and fixed in the heating guide block 15.

[0036] In order to monitor the temperature of the heating block, in a preferred embodiment, the heating assembly 151 also includes a thermocouple temperature sensor 1513 and a thermistor temperature sensor 1514, which are both fixedly disposed in the heating guide block 15 and are used to detect temperatures within different temperature ranges.

[0037] Among them, the thermocouple temperature sensor and thermistor temperature sensor 1514 are used to monitor the temperature in different temperature ranges respectively, so as to target different fiber bundle materials to improve the application range of the device, and the temperature of the heating guide block 15 can be adjusted in real time according to the monitored temperature data.

[0038] In order to improve the compaction quality, in a preferred embodiment, Figure 1 and 3As shown, the above-mentioned rolling device for multi-tow fiber 3D printing also includes a constant pressure component 3, which includes a pressure sensor 31 and an electric cylinder 32. The electric cylinder 32 is fixedly connected to the guide compaction block 1 via the pressure sensor 31, and can drive the guide compaction block 1 to move toward or away from the external printing platform. The pressure sensor 31 is electrically connected to the electric cylinder 32 to control the movement direction of the electric cylinder 32 in real time.

[0039] Among them, the constant pressure component 3 applies constant pressure to the fiber bundle through the guide compaction block 1 to achieve the effect of improving the compaction quality. Specifically, pressure is applied to the guide compaction block 1 through the electric cylinder 32, the magnitude of the applied force is detected by the pressure sensor 31, and the feedback force is input into the controller. The electric cylinder 32 is controlled by the PID unit negative feedback method so that the rolling device outputs a constant force.

[0040] It should be noted that, in the present embodiment, the pressure sensor 31 is fixedly connected to the electric cylinder 32 via a fixed bracket, and the electric cylinder 32 is arranged on an external robotic arm. When performing compaction operation, the entire rolling device can be driven by the robotic arm to move on a horizontal plane. The above technical solution is a solution that can be easily thought of by technicians in this field, and will not be elaborated here.

[0041] In order to avoid damage to the entire device caused by a sudden change in the output pressure of the electric cylinder 32, in a preferred embodiment, the above-mentioned rolling device for multi-tow fiber 3D printing also includes a retractable protection component 4, and the pressure sensor 31 is connected to the guide compaction block 1 through the protection component 4. When the pressure on the protection component 4 exceeds the set value, it contracts to relieve the pressure of the electric cylinder 32 on the guide compaction block 1.

[0042] When the electric cylinder 32 outputs too much pressure to the compaction guide block, the guide block output pressure is connected to the electric cylinder 32 protection component 4 to perform a contraction movement to relieve the pressure and avoid damage to the device.

[0043] In a preferred embodiment, the protection component 4 includes a connecting plate 41, a connecting block 42, two connecting columns 43 and two rigid springs 44. The connecting plate 41 is fixedly connected to the pressure sensor 31, the connecting block 42 is fixedly connected to the guide compacting block 1, and the connecting block 42 is provided with sliding holes 421 corresponding to the connecting columns 43 one by one. One end of the two connecting columns 43 is fixedly connected to the connecting plate 41, and the other end is inserted into the sliding hole 421. The connecting block 42 can slide along the axial direction of the connecting column 43, and the two rigid springs 44 are respectively sleeved on the outer circumference of the two connecting columns 43.

[0044] Among them, due to the setting of the rigid spring 44, when the applied force is within the set range, the rigid spring 44 will not undergo elastic deformation. When the suddenly applied force exceeds the set limit value, the rigid spring 44 will undergo elastic deformation, and the connecting column 43 will move further toward the sliding hole 421, thereby protecting the entire rolling device.

[0045] Compared with the prior art: the present invention provides a rolling device for multi-tow fiber 3D printing, which, through the setting of the guide groove 111 on the guide compacting block 1, limits the relative position of the multi-tow fibers in the guide groove 111 during transmission, and uses a laser to heat the fiber bundle in the guide groove 111 near the end of the pre-pressing groove 122, so that the bundle is transformed into a straight state, so as to ensure that multiple bundles enter the pre-pressing groove 122 in parallel, and further limit the relative position of the multi-tow fibers by the pre-pressing groove 122. At the same time, since the depth dimension of the pre-pressing groove 122 is smaller than the diameter dimension of the fiber bundle, the fiber bundle will be partially exposed outside the pre-pressing groove 122. Under the extrusion of the pre-pressing groove 122 and the printing platform, the fiber bundle can be pre-pressed and fixed on the printing platform, which is convenient for further compaction by the subsequent rolling wheel 2, and avoids the occurrence of irregular arrangement or dislocation of the multi-tow fibers during the rolling process, thereby improving the compaction quality of the fiber material and the molding and quality of the material;

[0046] At the same time, the sensor and the electric cylinder 32 in the constant pressure assembly 3 can be used to apply a constant pressure to the guide compacting block 1 and the fiber bundle, so as to achieve the effect of improving the compaction quality;

[0047] Furthermore, in order to cope with emergencies, when the electric cylinder 32 is out of control and the output pressure suddenly exceeds the limit value, the contraction movement of the protection component 4 can be used to prevent the pressure from continuing to rise and causing damage to the device.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A rolling device for multi-tow fiber 3D printing, characterized in that: It includes a guide compacting block and a rolling wheel; The guide compacting block can move toward or away from the external printing platform, and the guide compacting block has a guide part and a compacting part. The guide part is provided with a plurality of guide grooves arranged side by side, and the plurality of guide grooves correspond to a plurality of fiber bundles one by one. The external laser beam can heat the fiber bundles in one end of the guide groove close to the compacting part. The compacting part faces the external printing platform, and the compacting part is provided with a mounting groove and a plurality of pre-pressing grooves. The depth dimension of the pre-pressing groove is smaller than the diameter dimension of the fiber bundle. The plurality of pre-pressing grooves correspond to the plurality of guide grooves one by one, and any one of the guide grooves is connected to the mounting groove through a pre-pressing groove, and the fiber bundles are transmitted in sequence through the guide groove, the pre-pressing groove and the mounting groove. The rolling wheel is rotatably arranged in the mounting groove to compact the fiber bundle on the external printing platform; The guide compacting block includes an unheated guide block, an insulating guide block and a heated guide block which are fixedly connected in sequence along the transmission direction of the fiber bundle. The unheated guide block, the insulating guide block and the heated guide block are located on the same plane and one end thereof is recessed to form the guide portion. The guide groove is provided in the recess of the guide portion. The heated guide block faces the external printing platform. The side wall of the heated guide block close to the external printing platform is the compacting portion. A heating component is provided in the heated guide block to heat the heated guide block.

2. The rolling device for multi-tow fiber 3D printing according to claim 1, characterized in that: A guide slot cover is fixedly arranged at the recess of the unheated guide block to close the guide slot on the unheated guide block.

3. The rolling device for multi-tow fiber 3D printing according to claim 2, characterized in that: The depth component of the guide groove becomes smaller along the transmission direction of the fiber bundle, and the depth dimension of the guide groove on the heating guide block is half of the diameter dimension of the fiber bundle. The fiber bundle on the heating guide block is partially exposed outside the guide groove to facilitate heating by an external laser beam.

4. The rolling device for multi-tow fiber 3D printing according to claim 3, characterized in that: The pre-pressing groove has the same depth dimension as the guide groove on the heating guide block, and the connection between the pre-pressing groove and the guide groove is rounded.

5. The rolling device for multi-tow fiber 3D printing according to claim 4, characterized in that: The heating assembly includes a first heating rod and a second heating rod. The first heating rod is inserted into the heating guide block, and the second heating rod serves as a rotating shaft of the rolling wheel and is rotatably connected to the inner wall of the mounting groove.

6. The rolling device for multi-tow fiber 3D printing according to claim 5, characterized in that: The heating assembly further comprises a thermocouple temperature sensor and a thermistor temperature sensor, wherein the thermocouple temperature sensor and the thermistor temperature sensor are both fixedly disposed in the heating guide block and are respectively used to detect temperatures within different temperature ranges.

7. The rolling device for multi-tow fiber 3D printing according to any one of claims 1 to 6, characterized in that: It also includes a constant pressure component, which includes a pressure sensor and an electric cylinder. The electric cylinder is fixedly connected to the guide compacting block via the pressure sensor and can drive the guide compacting block to move toward or away from the external printing platform. The pressure sensor is electrically connected to the electric cylinder to control the movement direction of the electric cylinder in real time.

8. The rolling device for multi-tow fiber 3D printing according to claim 7, characterized in that: It also includes a retractable protection component, through which the pressure sensor is connected to the guide compacting block. When the pressure on the protection component exceeds a set value, it contracts to relieve the pressure of the electric cylinder on the guide compacting block.

9. The rolling device for multi-tow fiber 3D printing according to claim 8, characterized in that: The protection component includes a connecting plate, a connecting block, two connecting columns and two rigid springs. The connecting plate is fixedly connected to the pressure sensor, and the connecting block is fixedly connected to the guide compacting block. The connecting block is provided with sliding holes corresponding to the connecting columns one by one. One end of the two connecting columns is fixedly connected to the connecting plate, and the other end is inserted into the sliding hole. The connecting block can slide along the axial direction of the connecting column, and the two rigid springs are respectively sleeved on the outer circumference of the two connecting columns.

Images