A stripper fabric positioning device and method for a closed cross-section thin-walled structure pultrusion process

Abstract

The application belongs to the field of pultrusion process, and discloses a demoulding cloth positioning device and method for closed section thin-walled structure pultrusion process, which comprises a base, a feeding mechanism, a positioning mechanism and a winding mechanism are arranged on the base, the feeding mechanism comprises a support frame and a feeding servo motor, the support frame is bolted to the base, two feeding reels and a guide roller located on one side of the feeding reel are rotatably connected to the support frame, and the feeding servo motor is coaxially connected with the feeding reel; the positioning mechanism is used for positioning the demoulding cloth sent by the feeding mechanism, the winding mechanism is arranged on the side away from the feeding mechanism, the winding mechanism comprises a winding servo motor and a winding reel coaxially connected with the winding servo motor, and the winding reel is fixed to the base through a support frame. The application solves the problem that the existing demoulding cloth positioning device cannot realize accurate positioning in the pultrusion process, and the device structure of the application is reasonable, and the positioning mode is efficient and quick.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pultrusion process, in particular to a positioning device and method for release cloth in pultrusion process of closed cross-section thin-walled structure. BACKGROUND

[0002] Pultrusion forming technology can be continuously formed to make size-unlimited products, and has the characteristics of high efficiency and low cost, which is one of the key technologies for manufacturing large-size composite material components. In the process of pultrusion forming, the release cloth is laid between the product and the metal mold, and reducing the friction and adhesion between the pultruded product and the mold is an important implementation way for the release of the pultruded product, which has been widely used in the pultrusion process industry.

[0003] The release cloth is prone to wrinkle and transverse deviation during pultrusion, which affects the surface quality of the product and the release effect. In view of the above problems, a positioning device for release cloth of composite material pultruded part is disclosed in Chinese patent (Patent Publication No. CN210283318U), however, the release cloth needs to pass through the guide convex roller and concave roller and be wound in S shape in the positioning device for release cloth, and the tension of the release cloth is difficult to control, which is prone to deformation in the pultrusion direction, thereby affecting the transverse positioning position of the release cloth. Therefore, there is an urgent need for a device that can accurately position the release cloth during pultrusion. SUMMARY

[0004] The present application aims to provide a positioning device and method for release cloth in pultrusion process of closed cross-section thin-walled structure, to solve the problem that the existing release cloth positioning device cannot achieve accurate positioning in the pultrusion process.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A positioning device for release cloth in pultrusion process of closed cross-section thin-walled structure, comprising a base, a feeding mechanism, a positioning mechanism and a winding mechanism are provided on the base, the feeding mechanism comprises a support frame and a feeding servo motor, the support frame is bolted to the base, two feeding rollers and a guide roller located on one side of the feeding roller are rotatably connected to the support frame, and the feeding servo motor is coaxially connected with the feeding roller; the positioning mechanism is used for positioning the release cloth sent out by the feeding mechanism, the winding mechanism is provided on the side away from the feeding mechanism, the winding mechanism comprises a winding servo motor and a winding roller coaxially connected with the winding servo motor, and the winding roller is fixed to the base through a support.

[0007] Further, the positioning mechanism comprises a positioning plate, a top outer frame and a bottom outer frame, one end of the positioning plate is connected with a support frame located on the other side of the front end feeding mechanism, the support frame is bolted on the base, the other end of the positioning plate is connected with a core mold, both sides of the positioning plate are bolted with positioning blocks, the positioning blocks are provided with positioning grooves, the top outer frame and the bottom outer frame are provided with adjusting mechanisms for adjusting the distance between the top outer frame and the bottom outer frame, and the top outer frame and the bottom outer frame are provided with soft pressing plates.

[0008] Further, each soft pressing plate is provided with a protrusion made of silicone rubber, the protrusion is arc-shaped, the length of the protrusion is the same as the width of the release cloth, and the thickness of the protrusion is greater than the height of the positioning groove.

[0009] Further, the adjusting mechanism comprises two racks, a gear and a lifting mechanism, the two racks are arranged on the top outer frame and the bottom outer frame respectively, the gear is rotatably connected to the positioning plate, the gear is connected with the two racks at the same time, both sides of the positioning plate are provided with sliding channels for the top outer frame and the bottom outer frame to slide, and the lifting mechanism is used to drive the bottom outer frame to realize up-down lifting.

[0010] Further, the lifting mechanism comprises a positioning servo motor, a worm transmission shaft, a worm gear, a lead screw and a lifting nut, the positioning servo motor is bolted on the base, the worm transmission shaft is coaxially connected to the output shaft of the positioning servo motor, the worm gear is engaged with the worm transmission shaft, the lead screw is connected with the worm gear, the lifting nut is threadedly connected with the lead screw, and the lifting nut is connected with the bottom outer frame through bolts.

[0011] Further, the top outer frame and the bottom outer frame are both connected with hard pressing plates, and each hard pressing plate is connected with a corresponding soft pressing plate through a spring.

[0012] Further, the positioning method of the release cloth positioning device is as follows:

[0013] S1, wind the upper and lower two layers of release cloths on two feeding rollers respectively, stretch the upper and lower two layers of release cloths through the guide rollers to the positioning plate, and at the same time, the upper and lower two layers of release cloths pass through the corresponding positioning grooves and are stretched to the storage roller along the pultrusion forming mold, the end portions of the upper and lower two layers of release cloths are connected with the storage roller, the distance of the soft pressing plate is set according to the thickness of the release cloth and the height of the positioning groove in the positioning block;

[0014] S2, start the feeding servo motor and the winding servo motor, the feeding servo motor drives the feeding roller to rotate, and a certain length of release cloth is transported along the pultrusion direction, the winding servo motor drives the winding roller to rotate, and a certain length of release cloth is received along the pultrusion direction, and the feeding and winding operations are separated by a curing cycle time each time;

[0015] S3, when the upper and lower new release cloths are transported to the positioning mechanism, the spacing between the two soft pressing plates is adjusted through the adjusting mechanism, and the soft pressing plates are used to extrude the upper and lower release cloths;

[0016] S4, when the soft pressing plate is completely attached to the surface of the positioning plate and stays for 3 seconds, the soft pressing plate is separated from the release cloth through the adjusting mechanism, the feeding servo motor and the winding servo motor continue to rotate forward, the release cloth that has been positioned enters the curing area along the pultrusion direction, and the new release cloth moves from the feeding roller to the positioning area, and the cycle is repeated, so that the upper and lower release cloths are accurately positioned in the pultrusion process.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1. The present application has horizontal positioning function and longitudinal flattening function, the positioning is reliable, the pressure is controllable, and the comprehensive positioning efficiency is high.

[0019] 2. The present application uses the positioning groove of the positioning block and the soft pressing plate to cooperate with positioning, solves the damage of the through slot to the surface of the release cloth in the existing positioning device, and increases the reliability of positioning.

[0020] 3. The present application does not need to wind S-shaped through rollers in the feeding process, the positioning is more simple and efficient, and the surface tension of the release cloth is easier to control.

[0021] 4. The present application uses springs and soft pressing plates to cooperate with pressure, the surface pressure distribution of the release cloth is more uniform, and the possibility of horizontal deviation is smaller.

[0022] 5. The present application realizes the lifting movement of the top outer frame and the bottom outer frame through the cooperation of the adjusting mechanism and the lifting mechanism, the movement precision is higher, and the movement process is more controllable.

[0023] 6. The present application realizes the synchronous reciprocating motion of the upper and lower soft pressing plates through the cooperation of the gear and rack, and the synchronous reciprocating motion of the upper and lower soft pressing plates is more stable.

[0024] 7. The present application realizes the high-precision and high-efficiency positioning of the upper and lower release cloths in the pultrusion process of the closed cross-section thin-walled structure. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of a release cloth positioning device for a closed cross-section thin-walled structure pultrusion process of the present application;

[0026] Figure 2 Figure 1 is a front view of a positioning device for a release cloth of a pultrusion process of a closed cross-section thin-walled structure according to the present application;

[0027] Figure 3 Figure 2 is a structural schematic diagram of a lifting mechanism in the present embodiment;

[0028] Figure 4 Figure 3 is a structural schematic diagram of a positioning mechanism in the present embodiment;

[0029] Figure 5 Figure 4 is a partial enlarged view of A in Figure 1; Figure 4

[0030] Figure 6 Figure 5 is a partial enlarged view of B in Figure 1; Figure 4

[0031] Figure 7 Figure 6 is a front view of a soft pressing plate in the present embodiment;

[0032] Figure 8 Figure 7 is an axonometric view of a feeding mechanism in the present embodiment;

[0033] Figure 9 Figure 8 is a front view of the feeding mechanism in the present embodiment;

[0034] Figure 10 Figure 9 is a front view of a winding mechanism in the present embodiment;

[0035] Figure 11 Figure 10 is a structural schematic diagram of a rear end support assembly in the present embodiment;

[0036] Figure 12 Figure 11 is a flow chart of a positioning method of the positioning device for the release cloth of the pultrusion process of the closed cross-section thin-walled structure according to the present application. DETAILED DESCRIPTION

[0037] The present application will be further described in detail below in combination with the drawings and embodiments:

[0038] The reference signs in the drawings of the specification include: 1 - base; 2 - front end support frame; 3 - feeding mechanism; 301 - feeding transmission shaft; 302 - feeding winding drum; 303 - guide roller; 4 - positioning mechanism; 401 - positioning flat plate; 402 - positioning block; 403 - soft pressing plate; 404 - spring; 405 - hard pressing plate; 406A - top outer frame; 406B - bottom outer frame; 407 - gear; 408 - rack; 409 - gear transmission shaft; 501 - positioning servo motor; 502 - shaft coupling; 503 - worm gear; 504 - worm transmission shaft; 6 - lifting mechanism; 601 - lead screw; 602 - lifting nut; 7 - winding mechanism; 701 - winding winding drum; 8 - mandrel; 9 - rear end support assembly.

[0039] As​​Figure 1 and Figure 2 As shown, a demolding fabric positioning device for a closed-section thin-walled structure pultrusion process includes a base 1. From left to right, the base 1 is equipped with a front support frame 2, a feeding mechanism 3, a positioning mechanism 4, a rear support assembly 9, and a winding mechanism 7. The base 1 is horizontally installed on the ground. The front support frame 2 is made of I-beams and is welded to the base 1. The feeding mechanism 3 includes a support frame and a feeding servo motor (e.g., ...). Figure 8 and Figure 9 As shown in the figure (the feeding servo motor is not shown), the support frame is bolted to the base 1. Two feeding drums 302 and guide rollers 303 located on one side of the feeding drums 302 are rotatably connected to the support frame. Each feeding drum 302 is rotatably connected to the support frame via a feeding drive shaft 301. The feeding servo motor is coaxially connected to the feeding drive shaft. The length of the guide roller 303 is the same as the width of the release fabric.

[0040] like Figures 4-6 As shown, the positioning mechanism 4 is used to position the demolding fabric fed by the feeding mechanism 3. The positioning mechanism 4 includes a positioning plate 401, a top outer frame 406A, and a bottom outer frame 406B. The left end of the positioning plate 401 is set on the left side of the feeding mechanism 3 via the front support frame 2, and the right end of the positioning plate 401 is connected to the core mold 8. Figure 1 , 2 (Neither section 4 nor section 4 shows the release fabric). The positioning plate 401 prevents the upper and lower layers of release fabric from completely adhering at this point. Simultaneously, one end of the positioning plate 401 connects to the front support frame 2, and the other end connects to the core mold 8, providing support for the end of the core mold 8. Positioning blocks 402 are bolted to both the front and rear sides of the positioning plate 401, and each positioning block 402 has positioning grooves on both its upper and lower sides. The front and rear sides of the positioning plate 401 also have sliding tracks for the top outer frame 406A and the bottom outer frame 406B to slide. Both the top outer frame 406A and the bottom outer frame 406B adopt a U-shaped structure, and both free ends of the top outer frame 406A and the bottom outer frame 406B have openings for sliding. The unopened side of the free end of the top outer frame 406A and the bottom outer frame 406B is slidably connected to the corresponding sliding track. An adjustment mechanism for adjusting the distance between the top outer frame 406A and the bottom outer frame 406B is provided. The adjustment mechanism includes four racks 408, two gears 407 and a lifting mechanism 6. The four racks 408 are respectively set on the side walls of the corresponding openings of the top outer frame 406A and the bottom outer frame 406B. The two gears 407 are rotatably connected to the two outer side walls of the positioning plate 401 through two gear drive shafts 409. Each gear 407 is simultaneously engaged with the two racks 408 on the same side.

[0041] like Figure 3 and Figure 4 As shown, the lifting mechanism 6 is used to drive the bottom outer frame 406B to move up and down. The lifting mechanism 6 includes a positioning servo motor 501, a worm gear drive shaft 504, two worm wheels 503, a lead screw 601, and a lifting nut 602. The positioning servo motor 501 is bolted to the base 1. The worm gear drive shaft 504 is coaxially connected to the output shaft of the positioning servo motor 501 via a coupling 502. Both ends of the worm gear drive shaft 504 are equipped with bearings and bearing sleeves (not shown in the figure), and the bearing sleeves are bolted to the base 1. The two worm wheels 503 are spaced apart on the base 1, and each worm wheel 503 meshes with the worm gear drive shaft 504. The lead screw 601 is connected to the worm wheels 503 via a flat key and is rotatably connected to the base 1. The lifting nut 602 is threaded to the lead screw 601 and is bolted to the bottom outer frame 406B.

[0042] Both the top outer frame 406A and the bottom outer frame 406B are bolted with rigid pressure plates 405. Each rigid pressure plate 405 has two springs 404 connected at intervals. Both springs 404 are connected to a soft pressure plate 403 located within either the top outer frame 406A or the bottom outer frame 406B. Figure 7 (As shown). Each soft pressure plate 403 has a protrusion made of silicone rubber. The protrusion is arc-shaped, and its length is the same as the width of the release cloth. The thickness of the protrusion is slightly greater than the height of the positioning groove. This prevents the sides of the protrusion from being squeezed into the positioning groove after being pressed during the extrusion positioning process. If the protrusion is subsequently lifted, it will slide out of the positioning groove with the release cloth, resulting in inaccurate positioning.

[0043] like Figure 10 and 11 As shown, the rear support assembly 9 is located on the left side of the winding mechanism 7. The rear support assembly 9 consists of a fixed plate and two support plates welded to the fixed plate. Rollers are connected between the two support plates via bearings. The rear support assembly 9 provides appropriate support force for the core mold 8 and ensures smooth movement of the demolding fabric. The winding mechanism 7 is located on the right side of the base 1 and includes a winding servo motor (…). Figure 10 (Not shown in the image) and a take-up drum 701 coaxially connected to the take-up servo motor. The take-up servo motor is coaxially connected to the take-up drum via a coupling 502. The take-up drum 701 is rotatably connected to a U-shaped frame, which is bolted to the base 1.

[0044] like Figure 12 As shown, the positioning method of the release fabric positioning device is as follows:

[0045] S1, the upper and lower two layers of release cloth are wound on two feeding rollers 302, and the upper and lower two layers of release cloth are stretched to the positioning plate 401 through the guide roller 303, and the upper and lower two layers of release cloth are stretched to the storage roller through the positioning groove in the positioning block 402, the end of the upper and lower two layers of release cloth is connected with the storage roller, according to the thickness of the release cloth and the height of the positioning groove in the positioning block 402, the distance of the soft pressing plate 403 is set, in the embodiment, the distance of the soft pressing plate 403 is equal to the height of the positioning groove minus the thickness of the release cloth, and the result is multiplied by a coefficient of 1.2-1.5.

[0046] S2, the feeding servo motor and the winding servo motor are started, the feeding servo motor drives the feeding roller 302 to rotate, a certain length of release cloth is transported along the pultrusion direction, the winding servo motor drives the winding roller 701 to rotate, a certain length of release cloth is stored along the pultrusion direction, and each time the feeding and winding operation is interval a curing cycle time (i.e. a cycle period).

[0047] S3, when the upper and lower two layers of new release cloth are transported to the positioning mechanism 4, the positioning servo motor 501 drives the worm transmission shaft 504 to rotate through the shaft coupling 502, the worm transmission shaft 504 drives the worm wheel 503 and the lead screw 601 to rotate circumferentially, the lead screw 601 drives the lifting nut 602 to vertically rise, and then drives the bottom outer frame 406B to vertically rise, the bottom outer frame 406B drives the top outer frame 406A to vertically descend through the cooperation of the gear 407 and the rack 408, so that the hard pressing plate 405 of the top outer frame 406A and the hard pressing plate 405 of the bottom outer frame 406B move synchronously and oppositely; the hard pressing plate 405 moves oppositely to drive the spring 404 to move oppositely, and then drives the upper and lower two soft pressing plates 403 to move oppositely, the upper and lower two protrusions extrude the release cloth on the positioning plate 401, when the soft pressing plate 403 descends to the set distance, the protrusions are extruded to the inside of the positioning block 402, the transverse shrinkage of the release cloth in the pultrusion process is suppressed, and the protrusions are attached to the surface of the positioning plate 401.

[0048] S4, when the bottom of the protrusion is completely attached to the surface of the positioning plate 401, stay for 3 seconds, so that the release cloth can better attach to the positioning plate 401, and the subsequent pre-preg enters, the release cloth can better attach to the resin on the surface of the pre-preg. The positioning servo motor 501 reverses slightly, drives the worm transmission shaft 504 to reverse, and then drives the worm wheel 503 and the lead screw 601 to reverse, drives the lifting nut 602 to descend, the bottom outer frame 406B descends, drives the top outer frame 406A to ascend through the cooperation of the gear 407 and the rack 408, the two soft pressing plates 403 move away from the positioning plate 401, when the protrusion on the soft pressing plate 403 is removed from the release cloth, the positioning servo motor 501 stops working, the feeding servo motor and the winding servo motor continue to rotate, the release cloth that has been positioned enters the curing area along the pultrusion direction, the new release cloth moves from the feeding drum 302 to the positioning area, and the cycle is repeated, realizing the precise positioning of the upper and lower release cloths in the pultrusion process.

[0049] The above is only an embodiment of the present application, and the specific technical solutions or characteristics known in the embodiments are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific embodiments in the specification can be used to explain the content of the claims.

Claims

1. A stripper fabric positioning device for a closed cross-section thin walled structure pultrusion process, characterized by: The application relates to a demolding cloth positioning device, which comprises a base, a feeding mechanism, a positioning mechanism and a winding mechanism, wherein the feeding mechanism comprises a supporting frame and a feeding servo motor, the supporting frame is bolted to the base, two feeding rollers and a guide roller located on one side of the feeding roller are rotationally connected to the supporting frame, and the feeding servo motor is coaxially connected with the feeding roller; the positioning mechanism is used for positioning the demolding cloth sent by the feeding mechanism; the winding mechanism is arranged on the side far from the feeding mechanism, and the winding mechanism comprises a winding servo motor and a winding roller coaxially connected with the winding servo motor; the winding roller is fixed to the base through a support; The positioning mechanism comprises a positioning plate, a top outer frame and a bottom outer frame, one end of the positioning plate is connected with a supporting frame located on the other side of the front feeding mechanism, the supporting frame is bolted to the base, the other end of the positioning plate is connected with a core mold, positioning blocks are bolted to the two sides of the positioning plate, positioning grooves are formed in the positioning blocks, an adjusting mechanism for adjusting the distance between the top outer frame and the bottom outer frame is arranged between the top outer frame and the bottom outer frame, and soft pressing plates are arranged on the top outer frame and the bottom outer frame. The positioning method of the demolding cloth positioning device is as follows: S1, the upper and lower two layers of demolding cloth are wound on the two feeding rollers, the upper and lower two layers of demolding cloth are stretched to the positioning plate through the guide roller, and meanwhile, the upper and lower two layers of demolding cloth pass through the corresponding positioning grooves and are stretched to the storage roller along the pultrusion forming mold; the end portions of the upper and lower two layers of demolding cloth are connected with the storage roller; the distance of the descending soft pressing plates is set according to the thickness of the demolding cloth and the height of the positioning grooves in the positioning blocks; S2, the feeding servo motor and the winding servo motor are started, the feeding servo motor drives the feeding roller to rotate, a certain length of demolding cloth is transported along the pultrusion direction, the winding servo motor drives the winding roller to rotate, and a certain length of demolding cloth is stored along the pultrusion direction; the feeding and winding operations are interval a solidification cycle time; S3, when the upper and lower two layers of new demolding cloth are transported to the positioning mechanism, the distance between the two soft pressing plates is adjusted through the adjusting mechanism, and the soft pressing plates are used for extruding the demolding cloth on the two sides; S4, when the soft pressing plates completely adhere to the surface of the positioning plate, the soft pressing plates are separated from the demolding cloth through the adjusting mechanism, the feeding servo motor and the winding servo motor continue to rotate, the demolding cloth which has been positioned enters the solidification area along the pultrusion direction, the new demolding cloth moves from the feeding roller to the positioning area, and the cycle is repeated, so that the accurate positioning of the upper and lower two layers of demolding cloth in the pultrusion process is realized.

2. A release cloth positioning device for a closed section thin walled structure pultrusion process as claimed in claim 1, wherein: Each soft pressing plate is provided with a protrusion made of silicon rubber, the protrusion is in an arc shape, the length of the protrusion is the same as the width of the demolding cloth, and the thickness of the protrusion is greater than the height of the positioning groove.

3. A release cloth positioning device for a closed section thin walled structure pultrusion process as defined in claim 1, wherein: The adjusting mechanism comprises two racks, a gear and a lifting mechanism, the two racks are arranged on the top outer frame and the bottom outer frame respectively, the gear is rotationally connected to a positioning plate, the gear is connected with the two racks at the same time, two sides of the positioning plate are provided with slide channels for the top outer frame and the bottom outer frame to slide, and the lifting mechanism is used to drive the bottom outer frame to realize up-down lifting.

4. A release cloth positioning device for a closed section thin walled structure pultrusion process as defined in claim 3, wherein: The lifting mechanism comprises a positioning servo motor, a worm transmission shaft, a worm wheel, a lead screw and a lifting nut, the positioning servo motor is bolted to a base, the worm transmission shaft is coaxially connected to an output shaft of the positioning servo motor, the worm wheel is engaged with the worm transmission shaft, the lead screw is connected with the worm wheel, the lifting nut is threadedly connected with the lead screw, and the lifting nut is connected with the bottom outer frame through bolts.

5. A release cloth positioning device for a closed section thin walled structure pultrusion process as defined in claim 4, wherein: Each of the hard pressing plates is connected with a corresponding soft pressing plate through a spring.

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