Curved surface needling mechanism and three-dimensional needling device comprising same

Abstract

The invention discloses a curved surface needling mechanism and a three-dimensional needling device comprising the curved surface needling mechanism, the curved surface needling mechanism can automatically conduct needling reinforcement on a curved surface, and therefore automation of needling reinforcement of the curved surface part of a fiber composite material prefabricated body can be achieved through the curved surface needling mechanism. The overall automation degree and the machining efficiency of machining of the fiber composite material prefabricated body with the curved surface are improved, and the consistency and reliability of products can be effectively guaranteed. The technical problems of poor product consistency and reliability and low processing efficiency caused by manual needling reinforcement of the curved surface part of the fiber composite material preform in the prior art are solved. Meanwhile, the three-dimensional needling device is further provided with an automatic feeding mechanism and an automatic cutting mechanism, automatic feeding and automatic cutting are achieved, the shape of a target fiber composite material prefabricated body can be formed, the automation degree of manufacturing of the whole prefabricated body is improved, the production efficiency is improved, and the risk of personnel injury is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of acupuncture technology, and in particular to a curved surface acupuncture mechanism and a three-dimensional acupuncture device containing the same. Background Art

[0002] Acupuncture is a common nonwoven reinforcement process. It uses a needle to repeatedly puncture the fiber mesh, felt or fabric. The needle has a barbed hook to entangle the fibers, and then the fibers or fiber layers are entangled with each other to form a certain structure and performance, thereby enhancing the overall strength. Nonwoven materials reinforced by acupuncture are widely used in industry, aerospace, new energy, construction industry and other fields.

[0003] The existing non-woven fiber composite preforms are processed by flat needle punching. However, with the increasing demand for industrial applications, there is an increasing demand for processing fiber composite preforms with curved surfaces, and flat needle punching reinforcement can no longer meet production needs.

[0004] For example, Figure 1 The crucible in the single crystal silicon Czochralski production process shown in FIG. 1 comprises a first circumferential surface 11, a first end surface 12 and a first arcuate surface 13 connected between the first circumferential surface 11 and the end surface 12; Figure 2 The nose cone, a key component in the aerospace field, comprises a second circumferential surface 21 and a conical surface 22; Figure 3 The preform shown includes a third circumferential surface 31, a second end surface 32 located at both ends of the third circumferential surface 31, and a second arcuate surface 33 connected between the third circumferential surface 31 and the second end surface 32, wherein the above-mentioned first arcuate surface 13, conical surface 22 and second arcuate surface 33 are all curved surfaces, and traditional planar needling cannot be used to independently complete needle reinforcement.

[0005] At present, the needling reinforcement of existing fiber composite preforms with curved surfaces is completed by a combination of mechanical and manual methods, wherein flat needling is used to complete the needling of the circumferential surface or the flat part, and the needling reinforcement of the curved surface part is completed manually by workers. This processing method is not only unable to needle continuously, but also the consistency and reliability of the needling reinforcement are difficult to determine, and the number of workers required is large and the processing efficiency is low.

[0006] Therefore, the above-mentioned prior art has at least the following technical problems: in the prior art, the curved surface portion of the fiber composite material preform is reinforced by manual needle punching, resulting in poor product consistency and reliability, and low processing efficiency. Summary of the invention

[0007] The embodiments of the present application provide a curved needling mechanism and a three-dimensional needling device containing the same, thereby solving the technical problem in the prior art that the curved surface portion of a fiber composite material preform is reinforced by manual needling, resulting in poor product consistency and reliability and low processing efficiency.

[0008] In order to solve the above technical problems, in a first aspect, the embodiment of the present application provides a curved surface acupuncture mechanism, comprising:

[0009] At least two adaptive needle boards arranged side by side, wherein needles are arranged on the front side of the adaptive needle boards;

[0010] A first driving device, wherein the driving shaft is connected to the back of the adaptive needle plate in a one-to-one correspondence, and is used to drive the adaptive needle plate to move forward and backward to adjust the curvature radius of the curved surface formed by the front end of the needles on each of the adaptive needle plates;

[0011] A guide rail connected to the first drive device; in a first state, each of the first drive devices can move axially on the guide rail; in a second state, each of the first drive devices is fixed and cannot move on the guide rail;

[0012] The second driving device, whose driving shaft is connected to the guide rail, is used to drive the guide rail and the adaptive needle plate thereon to move forward and backward in the second state, so as to drive the needle to pierce into or withdraw from the curved surface to be reinforced by needle piercing.

[0013] Furthermore, the guide rail is an electromagnet guide rail, an electromagnet is provided inside the electromagnet guide rail, and the first driving device housing is made of a metal that can be attracted by a magnet;

[0014] In the first state, the electromagnetic guide rail is not energized, and each of the first driving devices can move axially on the electromagnetic guide rail;

[0015] In the second state, the electromagnetic guide rail is energized to generate electromagnetic adsorption force to adsorb each of the first driving devices. At this time, the position of each of the first driving devices on the electromagnetic guide rail is fixed and cannot be moved.

[0016] Furthermore, the adaptive needle plate is provided with a strain gauge pressure sensor for detecting the reaction force of the curved surface to be needled and reinforced on the needle;

[0017] In the first state, the corresponding adaptive needle plate is driven forward by the first driving device to gradually approach the curved surface to be reinforced by needle puncture; when the pressure signal detected by the strain gauge pressure sensor reaches the set threshold, the driving shaft position of the corresponding first driving device is locked; when the pressure signals detected by all the strain gauge pressure sensors reach the set threshold, the electromagnet guide rail is controlled to be energized, which is the second state.

[0018] Specifically, the curved surface acupuncture mechanism further includes a controller, a signal input end of the controller is connected to the strain gauge pressure sensor, and is used to receive a pressure signal acquired by the strain gauge pressure sensor, a signal output end of the controller is connected to both the first driving device and the limit device, and the controller can identify whether the corresponding angle of the adaptive needle plate is adapted to the curvature of the curved surface to be acupunctured and reinforced according to the pressure signal;

[0019] In the process that the first driving device respectively drives the needles on the adaptive needle plates to needle the curved surface to be needled and reinforced to adapt to the slope of the curved surface to be needled, when the controller recognizes that any of the adaptive needle plates has adapted to the curvature of the curved surface to be needled and reinforced, the controller locks the relative distance between the adaptive needle plates and the curved surface to be needled and reinforced by controlling the corresponding first driving device, and when all of the adaptive needle plates have respectively adapted to the curvatures of different parts of the curved surface to be needled and reinforced, and each of the adaptive needle plates is formed as a whole to adapt to the curved surface to be needled and reinforced, the controller locks the limiting devices of each of the first driving devices, thereby locking the relative position between each of the adaptive needle plates and the curved surface to be needled and reinforced.

[0020] Furthermore, adjacent adaptive needle plates are connected via hinges; and / or

[0021] The driving shaft of the first driving device is connected to the back side of the adaptive needle plate through a hinge.

[0022] Furthermore, the second driving device is arranged on a direction adjustment device having one or more degrees of freedom adjustment functions.

[0023] Specifically, the first driving device is an electric cylinder / pneumatic cylinder, and the output rod of the electric cylinder is hinged to the back side of the corresponding adaptive needle plate;

[0024] When the controller recognizes that any of the adaptive needle plates has adapted to the curvature of the curved surface to be needling reinforced, the controller locks the length of the output rod of the electric cylinder, thereby locking the relative distance between the adaptive needle plate and the curved surface to be needling reinforced.

[0025] In a second aspect, an embodiment of the present application further provides an acupuncture device, the device comprising the curved surface acupuncture mechanism described in any one of the first aspects.

[0026] Furthermore, the device comprises:

[0027] A frame body, on which a core mold and a third driving device for driving the core mold to rotate are arranged;

[0028] An automatic feeding mechanism, used for conveying the fiber material to the core mold so as to be wound onto the core mold under the drive of the third driving device;

[0029] The curved surface needling mechanism as described in any one of the first aspects can be arranged on the frame so as to be adjustable up, down, left, and right, and is used to perform a needling process on the fiber material wound onto the curved surface of the core mold.

[0030] Furthermore, the automatic feeding mechanism includes a feeding bracket, and a feeding plane for laying the fiber material is formed on the feeding bracket. When the core mold rotates, the fiber material can be driven to be wound on the core mold.

[0031] Furthermore, the needling device also includes an automatic cutting mechanism for cutting the fiber material into a shape that can form a target preform during the feeding process.

[0032] Furthermore, the automatic cutting mechanism includes a gantry erected on the feeding plane, the gantry can allow the fiber material to pass through, and a laser emitter that can move up, down, left and right is provided on the gantry, and the laser emitted by the laser emitter can cut the fiber material.

[0033] The needling device described in the embodiment of the present application is provided with a curved surface needling mechanism for needling and fixing the curved surface. The curved surface needling mechanism can realize the automation of needling and fixing the curved surface part of the fiber composite material preform, thereby improving the overall automation level and processing efficiency of the processing of the fiber composite material preform containing the curved surface, and can effectively ensure the consistency and reliability of the product; at the same time, the embodiment of the present application is also provided with an automatic feeding mechanism and an automatic cutting mechanism, which automatically feed the core mold and automatically cut it into a shape that can form a target fiber composite material preform, thereby improving the automation level of the entire preform production, improving production efficiency, and reducing the risk of personal injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of a crucible in the prior art;

[0036] Figure 2 It is a schematic diagram of the structure of the nose cone in the prior art;

[0037] Figure 3It is a schematic structural diagram of a fiber composite material preform having curved surfaces at both ends in the prior art;

[0038] Figure 4 It is a schematic structural diagram of a three-dimensional needling device used for needling a fixed crucible preform in one embodiment of the present invention;

[0039] Figure 5 for Figure 4 Side view of

[0040] Figure 6 for Figure 4 Structural diagram of the middle part structure;

[0041] Figure 7 It is a structural schematic diagram of a curved surface acupuncture mechanism in one embodiment of the present invention;

[0042] Figure 8 It is a partial structural schematic diagram of a curved surface needling mechanism in one embodiment of the present invention when the needles are not in contact with the curved surface to be needling reinforced;

[0043] Fig. 9 It is a partial structural schematic diagram of a curved surface needling mechanism in one embodiment of the present invention when the needles have been attached to the curved surface to be needled and reinforced;

[0044] Fig.10 It is a structural schematic diagram of an automatic cutting mechanism in one embodiment of the present invention;

[0045] Fig.11 It is a schematic diagram of the structure of the crucible preform after cutting the fiber material in one embodiment of the present invention;

[0046] Fig.12 It is a schematic structural diagram of a three-dimensional acupuncture device used for acupuncture and fixing a nose cone preform in one embodiment of the present invention;

[0047] Fig.13 A side view of a three-dimensional needling device used for needling and fixing a fiber composite material preform having curved surfaces at both ends in one embodiment of the present invention;

[0048] Fig.14 It is a schematic structural diagram of a three-dimensional needling device used for needling and fixing a fiber composite material preform having curved surfaces at both ends in one embodiment of the present invention. DETAILED DESCRIPTION

[0049] The embodiments of the present application provide a curved needling mechanism and a three-dimensional needling device containing the same, thereby solving the technical problem in the prior art that the curved surface portion of a fiber composite material preform is reinforced by manual needling, resulting in poor product consistency and reliability and low processing efficiency.

[0050] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] like Figures 4 to 6 As shown, one or more embodiments of the present application provide a three-dimensional needling device, which includes a frame 100, on which a mounting platform 109 is disposed, on which a core mold for processing a preform is rotatably disposed, for example, a core mold for processing a crucible preform 210, which rotates under the drive of a driving motor and winds a fiber material 520 to form a crucible preform 210. The frame 100 is provided with a first planar needling mechanism 310 and a second planar needling mechanism 320 for needling and fixing the first circumferential surface 11 and the first end surface 12 of the crucible preform 210, respectively, and the first planar needling mechanism 310 and the second planar needling mechanism 320 are both mature products in the prior art, which will not be described in detail here.

[0052] The frame 100 is also provided with a curved surface needling mechanism 400 for needling and reinforcing the curved surface portion (i.e., the first curved surface 13) of the crucible preform 210. The curved surface needling mechanism 400 can realize the automation of needling and fixing the curved surface portion of the fiber composite material preform, effectively solving the technical problem in the prior art that the curved surface portion of the fiber composite material preform is manually needled and reinforced, resulting in poor product consistency and reliability and low processing efficiency, improving the overall automation level and processing efficiency of the processing of the curved fiber composite material preform, and can effectively ensure the consistency and reliability of the product.

[0053] like Figures 4 to 6 As shown, the curved surface acupuncture mechanism 400 is arranged on the mounting platform 101. Figures 4 to 6 The three-dimensional acupuncture device is oriented in the use state, and the frame 100 is provided with a first vertical guide rail 102 extending in the vertical direction and a first horizontal guide rail 103 extending in the length direction, wherein the mounting platform 101 is slidably arranged on the first vertical guide rail 102, and the two ends of the first vertical guide rail 102 are respectively fixed on the guide rail plate 104, and the guide rail plate 104 is slidably arranged on the first horizontal guide rail 103 in the length direction;

[0054] The mounting platform 101 is provided with a first vertical lead screw 105 which is parallel to the first vertical guide rail 102 and meshes with the mounting platform 101. One end of the first vertical lead screw 105 is connected to a first motor 106, which is located on one of the guide rail plates 104. When the first motor 106 rotates forward or reversely, it drives the first vertical lead screw 105 to rotate forward or reversely, thereby driving the mounting platform 101 to move up and down, thereby adjusting the vertical position of the mounting platform 101.

[0055] The upper and lower guide plates 104 are slidably arranged on the upper and lower first horizontal guide rails 103 respectively, and the lower guide plate 104 is also provided with a first horizontal lead screw 107 parallel to the first horizontal guide rail 103, and the first horizontal lead screw 107 is meshed with the guide plate 104, and one end of the first horizontal lead screw 107 is connected to a second motor 108. When the second motor 108 rotates forward or reversely, the first horizontal lead screw 107 is driven to rotate forward and reversely, and the guide plate 104 can be driven to move horizontally left and right, so that the horizontal position of the mounting platform 101 can be adjusted. Combined with the vertical position adjustment of the aforementioned mounting platform 101, the position of the curved surface acupuncture mechanism 400 arranged on the mounting platform 101 can be comprehensively adjusted, so that the curved surface acupuncture mechanism 400 can match the position of the curved surfaces of different preforms.

[0056] In addition, the acupuncture device further comprises a controller, and the driving motor, the first motor 106 and the second motor 108 are respectively connected to the controller, and the controller can control the opening, closing and turning of the driving motor, the first motor 106 and the second motor 108.

[0057] like Figure 7 As shown, the curved surface needling mechanism 400 includes a head and a tail, wherein the head includes a needle 409, and the tail is used to adjust the inclination angle of the needle 409 and drive the needle 409 to penetrate or withdraw from the fiber material 520 for needling fixation.

[0058] The tail portion includes a first servo 401 disposed on the mounting platform 101, a second servo 402 is vertically connected to the rotating shaft of the first servo 401, a cylinder 403 is connected to the rotating shaft of the second servo 402, and an output shaft of the cylinder 403 is used to connect with the head portion to drive the head portion as a whole to move forward or backward, thereby driving the needles 409 on the head portion to penetrate or withdraw from the fiber material 520 for acupuncture fixation; at the same time, the rotation of the rotating shafts of the first servo 401 and the second servo 402 provides angle adjustment of the cylinder 403 in two dimensions, thereby adjusting the inclination angle of the needles 409 to match curved surfaces with different curvatures.

[0059] Further, the tail portion includes two cylinders 403 arranged side by side, and the two cylinders 403 are connected as a whole through a fixing plate, and are simultaneously connected to the second steering gear 402 through the fixing connection between the fixing plate and the rotating shaft of the second steering gear 402. In addition, the first steering gear 401 and the second steering gear 402 are respectively connected to a controller, and the controller can respectively control the opening, closing and steering of the first steering gear 401 and the second steering gear 402. In addition, the cylinder 403 can also be a hydraulic cylinder, an electric cylinder or other equipment with the same function.

[0060] like Figures 7 to 9 As shown, the head includes a connecting plate 404, the rear end of the connecting plate 404 is provided with a cylinder connecting shaft 4041 fixedly connected to the output shafts of the two cylinders 403 respectively, and the front end of the connecting plate 404 is provided with an electromagnetic guide rail 405;

[0061] The head includes at least two adaptive needle plates 408 arranged side by side, the front side of the adaptive needle plates 408 is provided with the above-mentioned needles 409, the back side of the adaptive needle plates 408 is hinged to the output rod 407 of the electric cylinder 406, and the adaptive needle plates 408 correspond to the electric cylinder 406 one by one;

[0062] The ends of the electric cylinders 406 are slidably mounted on the electromagnetic guide rail 405 in sequence. The electromagnetic guide rail 405 is provided with an electromagnet inside. The outer shell of the electric cylinder 406 is made of a metal that can be attracted by a magnet (such as iron, nickel, cobalt or an alloy thereof). When the electromagnetic guide rail 405 is not powered, the electric cylinders 406 can slide on the electromagnetic guide rail 405. When the electromagnetic guide rail 405 is powered, the electromagnet inside it generates an electromagnetic force that can adsorb the electric cylinder 406. The greater the input power of the electromagnetic guide rail 405, the greater the electromagnetic adsorption force generated, thereby locking the axial position of each electric cylinder 406 on the electromagnetic guide rail 405.

[0063] The output rod 407 of the electric cylinder 406 is hinged to the back side of the corresponding adaptive needle plate 408, so the adaptive needle plate 408 can swing relative to the output rod 407 of the electric cylinder 406, and the angle between the adaptive needle plate 408 and the output rod 407 of the electric cylinder 406 can be adjusted; at the same time, the adaptive needle plate 408 and the output rod 407 of the electric cylinder 406 can move forward and backward synchronously, and when the output rod 407 of the electric cylinder 406 is extended or contracted, the needle 409 on the adaptive needle plate 408 can be driven to penetrate or withdraw from the fiber material 520.

[0064] In addition, two adjacent adaptive needle plates 408 are hinged, so that the angle between the adjacent needle plates 408 can be adjusted, so that each of the adaptive needle plates 408 can form a shape that is compatible with the entire curved surface to be needled and reinforced;

[0065] A strain gauge pressure sensor 413 for detecting the reaction force of the fiber material 520 on the needle 409 is provided on the back of each of the adaptive needle plates 408;

[0066] The signal input end of the controller is connected to the strain gauge pressure sensor 413, and is used to receive the pressure signal obtained by the strain gauge pressure sensor 413. A pressure threshold is pre-stored in the controller. The controller compares the pressure corresponding to the pressure signal with the pressure threshold. The signal output end of the controller outputs a control signal according to the comparison result. The control signal is used to control the power of the electromagnetic guide rail 405 and the corresponding electric cylinder 406, thereby locking or unlocking the axial position of the electric cylinder 406 on the electromagnetic guide rail 405, and locking the length of the output rod 407 of the electric cylinder 406.

[0067] Specifically, when adjusting the curvature of the corresponding part on the curved surface to which the needles 409 on different adaptive needle plates 408 are adapted, all the electric cylinders 406 are turned on, and the output rods 407 of the electric cylinders 406 are extended or contracted to drive the needles 409 on the adaptive needle plates 408 to pierce into or withdraw from the fiber material 520. During the repeated needling process, the needles 409 are adjusted to an inclination angle adapted to the corresponding part on the curved surface, and when the needles 409 on any adaptive needle plate 408 are adapted to the corresponding part on the curved surface, the reaction force of the curved surface on the adaptive needle plate 408 is the largest, which is the pressure threshold. Therefore, it can be tested or simulated experimentally or simulated. Calculation is performed to obtain the pressure threshold, and when the pressure reaches the pressure threshold, the controller locks the length of the output rod 407 corresponding to the electric cylinder 406, thereby locking the relative distance between the adaptive needle plate 408 and the curved surface to be reinforced by acupuncture, and when all the adaptive needle plates 408 have respectively adapted to the curvatures of different parts of the curved surface to be reinforced by acupuncture, the controller increases the power of the electromagnetic guide rail 405 to increase the magnetism of the electromagnet, thereby locking the axial position of each electric cylinder 406 on the electromagnetic guide rail 405, and then locking the relative position between the adaptive needle plate 408 and the curved surface to be reinforced by acupuncture.

[0068] On the contrary, when the pressure is less than the pressure threshold, the controller does not lock the length of the output rod 407 of the electric cylinder 406, nor does it increase the power of the magnet guide rail 405, thereby allowing the needle 409 to continue to repeatedly acupuncture and allowing the electric cylinder 406 to slide axially on the electromagnet guide rail 405.

[0069] When all the adaptive needle plates 408 have adapted to the curvature of different parts of the curved surface to be needled and reinforced, the controller locks the length of the output rod 407 of the electric cylinder 406 and the axial position of the electric cylinder 406 on the electromagnetic guide rail 405, and the relative angles between the corresponding adaptive needle plates 408 are fixed, forming a shape that adapts to the curved surface as a whole, such as Fig. 9 shown.

[0070] It should be noted that the electric cylinder 406 is a micro electric cylinder, which drives the needle head to slightly penetrate the curved surface of the fiber composite material preform, and is only used for early adjustment. Once the adaptive needle plate 408 is adjusted to a shape that adapts to the curved surface, the cylinder 403 is used to drive the needle 409 of the entire head to penetrate or withdraw from the fiber material 520 to complete the needle fixation of the curved surface. The electric cylinder 406 can also be a cylinder, a hydraulic cylinder, a crank rocker mechanism, or other equipment with the same function.

[0071] In summary, when adjusting the curved surface needling mechanism 400 to adapt to the curved surface to be needling reinforced, firstly, the position of the curved surface needling mechanism 400 is adjusted to a suitable position by controlling the first motor 106 and the second motor 108, then, the curved surface needling mechanism 400 is adjusted to a suitable inclination angle by controlling the first steering gear 401 and the second steering gear 402, and finally, the needling surface of each of the needles 409 is formed into a shape adapted to the curved surface by the above method, so that it can be attached to the curved surface to be needling reinforced, as shown in FIG. Fig. 9 shown.

[0072] It should be noted that if Fig. 9 As shown, adjacent adaptive needle plates 408 are hingedly connected by hinges 410 , a connecting shaft 411 is provided on the back of the adaptive needle plate 408 , and a kit 412 rotatably sleeved on the connecting shaft 411 is provided at the front end of the output rod 407 of the electric cylinder 406 .

[0073] In the existing production process of fiber composite material preforms, the fiber material 520 is cut manually and then manually wound on a core mold. Automatic loading and automatic cutting are impossible, which is time-consuming and labor-intensive, and has low processing efficiency.

[0074] To this end, in some embodiments of the present application, one side of the frame 100 is also provided with an automatic loading mechanism and an automatic cutting mechanism, which automatically loads the core mold (fiber material 520) and automatically cuts it into a shape that can form a target fiber composite material preform.

[0075] like Figure 4 , 5As shown, the automatic feeding mechanism includes a feeding bracket 510, on which a feeding plane is formed. The fiber material 520 is laid on the feeding plane, and one end of the fiber material 520 is fixed on the core mold (the fiber material 520 is fixed to the core mold by manual acupuncture to prevent the fiber material 520 from falling off). When the core mold rotates forward, the fiber material 520 is wound on the core mold, and when the core mold rotates reversely, the fiber material 520 is unwound on the core mold. In this way, automatic feeding can be formed.

[0076] like Figure 4 , 5 As shown in FIG. 10 , the automatic cutting mechanism includes a gantry 610 mounted on a loading plane, the gantry 610 allows the fiber material 520 to pass through, and a laser emitter 621 is movably provided on the gantry 610, the laser emitted by the laser emitter 621 cuts the fiber material 520, so that the fiber material 520 can be cut into a target shape by controlling the path of the laser emitted by the laser emitter 621 and combining the movement of the fiber material 520 on the loading plane (loading or unloading).

[0077] Furthermore, the bottom end of the gantry 610 is fixed on the loading plane through a base 680, a laser bracket guide rail 630 extending in the width direction is horizontally arranged on the gantry 610, and the laser emitter 621 is slidably arranged on the laser bracket guide rail 630 through a laser mounting bracket 622. In this way, the horizontal position of the laser emitter 621 in the width direction can be adjusted.

[0078] The two ends of the laser support rail 630 are fixed on the slide 640. The two sides of the gantry 610 are provided with a second vertical rail 650 extending vertically. The slide 640 can be slid up and down on the second vertical rail 650, and the slide 640 is provided with a second vertical lead screw 660 parallel to the second vertical rail 650. The second vertical lead screw 660 is meshed with the slide 640. The bottom end of the second vertical lead screw 660 is connected to a third motor 670. The third motor 670 is driven to rotate forward and reversely to drive the slide 640 to move up and down, so that the vertical position of the laser support rail 630 can be adjusted, that is, the vertical position of the laser emitter 621 can be adjusted. Therefore, based on the above, the horizontal position adjustment function of the laser emitter 621 can fully adjust the position of the laser emitter 621, thereby adjusting the laser angle to meet the cutting requirements.

[0079] Further, such as Fig.10As shown, the two skateboards 640 are provided with driving wheels and driven wheels relatively, the driving wheel is connected to the fourth motor, a chain 690 is tensioned between the driving wheel and the driven wheel, and the chain 690 is fixedly connected to the back side of the laser mounting bracket 622. When the fourth motor rotates forward and reverse, the chain 690 is driven to rotate between the driving wheel and the driven wheel, thereby synchronously driving the laser emitter 621 to slide left and right along the laser bracket guide rail 630.

[0080] Take the cutting of the fiber material 520 of the crucible preform 210 as an example. Fig.11 As shown, the width of the fiber material 520 is L, and one side of the fiber material 520 needs to be cut into a row of continuous saw teeth, wherein the tooth pitch is a and the tooth height is s, so that a crucible preform 210 with a circumferential surface height of d and an arc surface width s=Ld can be formed.

[0081] Using a single-pass cutting strategy, the maximum scanning speed V of the laser emitter 621 during a single cut is max The calculation formula is (2-1):

[0082]

[0083] Wherein, E represents the gasification energy of the fiber material 520, P represents the laser power, d represents the laser beam diameter, δ represents the thickness of the fiber material 520, represents the volume content of the fiber material 520.

[0084] Laser power and duty cycle F d The larger the duty cycle, the higher the laser power. The duty cycle F of the laser light d is the ratio of the light emission time to the total time, and the calculation formula is (2-2):

[0085]

[0086] Among them, pf is the laser pulse frequency and pw is the laser pulse width.

[0087] In the process of automatic cutting, it is necessary to know the rotation speed n of the prefabricated rotating body, the time for the prefabricated rotating body to rotate one circle is t0, the initial radius of the prefabricated rotating body is r0, and each layer needs to increase r*. The linear speed v of the rotating body is 2π(r0+r * )n, the speed of the laser emitter is v 激光 ,but

[0088]

[0089] Note that v 激光 The following conditions must also be met: 激光 ≤V maxOtherwise, the speed of the laser emitter will be too fast and it will not be able to cut.

[0090] In the process of automatic feeding, the starting section of the fiber material 520 is first manually fixed on the crucible preform 210, and then the drive motor is started, the preform rotating body rotates at a speed n, the fiber material 520 is fed, and the laser emitter 621 is moved from the edge of the laser support guide rail 630 at a speed v 激光 Move horizontally toward the center, moving time t = s / v 激光 Then the laser emitter 621 reverses and moves from the middle of the laser support rail 630 at a speed v 激光 Move horizontally toward the edge, and the moving time is also t. Repeat this process to cut out the fiber material 520 that fits the curved surface of the prefabricated rotating body, and the cutting of the fiber material 520 is completed.

[0091] Therefore, the automatic feeding mechanism and the automatic cutting mechanism described in the embodiment of the present application can automatically feed the core mold and automatically cut it into a shape that can form a preform, thereby improving the degree of automation and also improving processing efficiency.

[0092] An exemplary method of processing a crucible preform using the acupuncture device is as follows:

[0093] The position of the curved surface acupuncture mechanism 400 is adjusted to a suitable position relative to the curved surface to be acupunctured by controlling the first motor 106 and the second motor 108, and the curved surface acupuncture mechanism 400 is adjusted to a suitable inclination angle relative to the curved surface to be acupunctured by controlling the first steering gear 401 and the second steering gear 402;

[0094] The adaptive needle plates 408 are adjusted to adapt to the curvature of different parts of the curved surface to be acupunctured and reinforced, and the length of the output rod 407 of the electric cylinder 406 is locked. When the adaptive needle plates 408 are formed as a whole into a shape adapted to the curved surface to be acupunctured and fixed, the axial position of each electric cylinder 406 on the electromagnetic guide rail 405 is locked by the controller;

[0095] Laying the fiber material 520 on a feeding plane, fixing one end of the fiber material 520 on a core mold, and cutting the fiber material 520 into a shape that can form a target crucible preform through an automatic feeding mechanism and an automatic cutting mechanism;

[0096] The cylinder 403 is turned on to drive the needles 409 of the entire head to penetrate or withdraw from the fiber material 520 to complete the needling fixation of the curved surface; at the same time, the first planar needling mechanism 310 and the second planar needling mechanism 320 are turned on to respectively needle-fix the first circumferential surface 11 and the first end surface 12 of the crucible preform 210 to complete the needling fixation of the entire crucible preform.

[0097] The acupuncture device described in the embodiment of the present application can also be used to acupuncture and fix other preforms with curved surfaces. Fig.12 As shown, the acupuncture device can also be used to acupuncture and fix the nose cone preform 220. Fig.13 , 14 As shown, the needling device can also be used to needle-fix a fiber composite material preform 230 having curved surfaces at both ends. Since it contains two curved surfaces to be reinforced by needling, two curved surface needling mechanisms 400 are required to be set up, or another curved surface needling mechanism 400 can be fixed to one side of the frame 100 by a robotic arm 700, which is not limited here.

[0098] In summary, the needling device described in the embodiment of the present application is provided with a curved surface needling mechanism 400 for needling and fixing the curved surface. The curved surface needling mechanism 400 can realize the automation of needling and fixing the curved surface part of the fiber composite material preform, thereby improving the overall automation level and processing efficiency of the processing of the fiber composite material preform containing the curved surface, and can effectively ensure the consistency and reliability of the product; at the same time, the embodiment of the present application is also provided with an automatic feeding mechanism and an automatic cutting mechanism, which automatically feeds the core mold and automatically cuts it into a shape that can form a target fiber composite material preform, thereby improving the automation level of the entire preform production, improving production efficiency, and reducing the risk of personal injury.

[0099] It should be understood that although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit without departing from the scope of the exemplary embodiments.

[0100] The directional terms such as outer, middle, inner, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0101] The above is only a preferred embodiment of the present application, and is not any formal or substantial limitation to the present application. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present application, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present application, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present application; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the substantial technology of the present application are still within the scope of the technical solution of the present application.

Claims

1. A curved surface acupuncture mechanism, characterized in that: include: At least two adaptive needle boards arranged side by side, with needles mounted on the front of the adaptive needle boards; A first driving device, whose driving shaft is connected to the back of the adaptive needle plate in a one-to-one correspondence, and is used to drive the adaptive needle plate to move forward and backward to adjust the curvature radius of the curved surface formed by the front end of the needles on each adaptive needle plate; A guide rail connected to the first driving device; In a first state, each of the first driving devices can move axially on the guide rail; in a second state, each of the first driving devices is fixed and cannot move on the guide rail; The second driving device, whose driving shaft is connected to the guide rail, is used to drive the guide rail and the adaptive needle plate thereon to move forward and backward in the second state, so as to drive the needle to pierce or withdraw from the curved surface to be reinforced by needle piercing.

2. A curved surface acupuncture mechanism according to claim 1, characterized in that: The guide rail is an electromagnet guide rail, an electromagnet is arranged inside the electromagnet guide rail, and the housing of the first driving device is made of a metal that can be attracted by a magnet; In the first state, the electromagnetic guide rail is not energized, and each of the first driving devices can move axially on the electromagnetic guide rail; In the second state, the electromagnetic guide rail is energized to generate electromagnetic adsorption force to adsorb each of the first driving devices. At this time, the position of each of the first driving devices on the electromagnetic guide rail is fixed and cannot be moved.

3. A curved surface needling mechanism as claimed in claim 2, characterized in that: The adaptive needle plate is provided with a pressure sensor for detecting the reaction force of the curved surface to be reinforced by needling on the needle; In the first state, the corresponding adaptive needle plate is driven forward by the first driving device to gradually approach the curved surface to be reinforced by needle puncture; when the pressure signal detected by the pressure sensor reaches the set threshold, the driving shaft position of the corresponding first driving device is locked; when the pressure signals detected by all the pressure sensors reach the set threshold, the electromagnetic guide rail is controlled to be energized, which is the second state.

4. A curved surface acupuncture mechanism according to any one of claims 1 to 3, characterized in that: Adjacent adaptive needle plates are connected by hinges; and / or The driving shaft of the first driving device is connected to the back side of the adaptive needle plate through a hinge.

5. A curved surface needling mechanism according to any one of claims 1 to 3, characterized in that: The second driving device is arranged on a direction adjusting device having one or more degrees of freedom adjustment functions.

6. An acupuncture device, characterized in that: The device comprises the curved surface acupuncture mechanism as described in any one of claims 1 to 5.

7. An acupuncture device according to claim 6, characterized in that: The device comprises: A frame body, on which a core mold and a third driving device for driving the core mold to rotate are arranged; An automatic feeding mechanism, used for conveying the fiber material to the core mold so as to be wound onto the core mold under the drive of the third driving device; The curved surface needling mechanism as described in any one of claims 1 to 5 can be arranged on the frame so as to be adjustable up, down, left, and right, and is used for performing a needling process on the fiber material wound onto the curved surface of the core mold.

8. An acupuncture device according to claim 7, characterized in that: The automatic feeding mechanism comprises a feeding bracket, and a feeding plane for laying fiber materials is formed on the feeding bracket. When the core mold rotates, the fiber material can be driven to be wound on the core mold.

9. An acupuncture device according to claim 8, characterized in that: The needle punching device also includes an automatic cutting mechanism for cutting the fiber material into a shape that can form a target preform during the feeding process.

10. An acupuncture device according to claim 9, characterized in that: The automatic cutting mechanism comprises a gantry erected on the feeding plane, the gantry can allow fiber materials to pass through, and a laser emitter that can move up, down, left, and right is arranged on the gantry, and the laser emitted by the laser emitter can cut the fiber material.

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