CN116423875A - Mold release cloth positioning device and method for closed section thin wall structure pultrusion process - Google Patents

Abstract

The invention belongs to the field of a pultrusion process, and discloses a device and a method for positioning demolding cloth of a closed section thin-wall structure pultrusion process, wherein the device 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 connected to the base through bolts, two feeding drums and guide rollers positioned on one sides of the feeding drums are rotatably connected to the support frame, and the feeding servo motor is coaxially connected with the feeding drums; the positioning mechanism is used for positioning the demolding cloth sent out by the feeding mechanism, the winding mechanism is arranged on one side far away from the feeding mechanism and comprises a winding servo motor and a winding drum coaxially connected with the winding servo motor, and the winding drum is fixed on the base through a bracket. The invention solves the problem that the existing release cloth positioning device can not realize accurate positioning in the pultrusion process, and the device has reasonable structure and high-efficiency and quick positioning mode.

Description

Mold release cloth positioning device and method for closed section thin wall structure pultrusion process

Technical Field

The invention relates to the field of a pultrusion process, in particular to a device and a method for positioning release cloth of a closed section thin-wall structure pultrusion process.

Background

The pultrusion technology can be used for continuously forming products with unlimited size, has the characteristics of high efficiency and low cost, and is one of key technologies for manufacturing large-size composite material components. In the process of pultrusion, a release cloth is paved between a manufactured piece and a metal die, so that friction force and adhesive force between the pultruded piece and the die are reduced, which is an important implementation mode for releasing the pultruded piece, and the release cloth is widely applied in the pultrusion process industry.

The demolding cloth is easy to generate folds and transverse deflection in the process of drawing and extruding, and the surface quality and demolding effect of the workpiece are affected. In order to solve the problems, china patent (patent publication No. CN 210283318U) discloses a composite material pultrusion piece release cloth positioning device, however, release cloth in the release cloth positioning device needs to bypass a guide convex roller and a guide concave roller and is wound in an S shape, the tension of the release cloth is difficult to control, and deformation is easy to occur in the pultrusion direction, so that the transverse positioning position of the release cloth is influenced. Therefore, there is an urgent need for a device that can maintain the release cloth in a precise position during the pultrusion process.

Disclosure of Invention

The invention aims to provide a release cloth positioning device and a release cloth positioning method for a closed section thin-wall structure pultrusion process, so as to solve the problem that the existing release cloth positioning device cannot realize accurate positioning in the pultrusion process.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a drawing of patterns cloth positioner of closed cross-section thin wall structure pultrusion technology, includes the base, be equipped with feeding mechanism, positioning mechanism and winding mechanism on the base, feeding mechanism includes support frame and feeding servo motor, on the support frame bolted connection base, rotate on the support frame and be connected with two feeding reels and be located the direction running roller of feeding reel one side, feeding servo motor and feeding reel coaxial coupling; the positioning mechanism is used for positioning the demolding cloth sent out by the feeding mechanism, the winding mechanism is arranged on one side far away from the feeding mechanism and comprises a winding servo motor and a winding drum coaxially connected with the winding servo motor, and the winding drum is fixed on the base through a bracket.

Further, positioning mechanism includes location flat board, top outer frame and bottom outer frame, the one end of location flat board is connected with the support frame that is located front end feeding mechanism's opposite side, support frame bolted connection is on the base, the other end of location flat board is connected with the mandrel, the equal bolted connection in both sides of location flat board has the locating piece, the constant head tank has been seted up on the locating piece, be equipped with the adjustment mechanism who is used for adjusting interval between top outer frame and the bottom outer frame, all be equipped with soft clamp plate on top outer frame and the bottom outer frame.

Further, each soft pressing plate is provided with a protrusion made of silicon rubber, the protrusions are arc-shaped, the length of each protrusion is identical to the width of the demolding cloth, and the thickness of each protrusion is larger than the height of each positioning groove.

Further, adjustment mechanism includes two racks, gear and elevating system, two the rack sets up respectively on top outer frame and bottom outer frame, the gear rotates to be connected on the location flat board, the gear is connected with two racks simultaneous meshing, the slide that supplies top outer frame and bottom outer frame to slide is seted up to the both sides of location flat board, elevating system is used for driving bottom outer frame and realizes oscilaltion.

Further, elevating system includes location servo motor, worm transmission shaft, worm wheel, lead screw and lifting nut, location servo motor bolted connection is on the base, worm transmission shaft coaxial coupling is on location servo motor's output shaft, the worm wheel meshes with the worm transmission shaft mutually, the lead screw is in the same place with the worm wheel connection, lifting nut and lead screw threaded connection, lifting nut passes through the bolt and is connected with the bottom outer frame.

Further, the inside of the top outer frame and the inside of the bottom outer frame are respectively connected with a hard pressing plate, and a spring is connected between each hard pressing plate and the corresponding soft pressing plate.

Further, the positioning method of the release cloth positioning device comprises the following steps:

s1, respectively rolling an upper layer of demolding cloth and a lower layer of demolding cloth onto two feeding drums, stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a positioning flat plate by bypassing a guide roller, simultaneously stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a storage drum along a pultrusion mold through a corresponding positioning groove, connecting the ends of the upper layer of demolding cloth and the lower layer of demolding cloth with the storage drum, and setting the descending distance of a soft pressing plate according to the thickness of the demolding cloth and the height of the positioning groove in a positioning block;

s2, starting a feeding servo motor and a winding servo motor, wherein the feeding servo motor drives a feeding drum to rotate, a certain length of release cloth is conveyed along the pultrusion direction, the winding servo motor drives a winding drum to rotate, a certain length of release cloth is stored along the pultrusion direction, and each feeding and winding operation is separated by a curing cycle time;

s3, when the upper layer of new release cloth and the lower layer of new release cloth are conveyed to the positioning mechanism, the distance between the two soft pressing plates is adjusted through the adjusting mechanism, and the release cloths on the upper side and the lower side are extruded by the soft pressing plates;

s4, when the soft pressing plate is completely attached to the surface of the positioning flat plate and then stays for 3 seconds, the soft pressing plate is driven by the adjusting mechanism to separate from the release cloth, the feeding servo motor and the winding servo motor continue to rotate positively, the positioned release cloth enters the curing area along the pultrusion direction, the new release cloth moves from the feeding winding drum to the positioning area, and the positioning of the upper layer of release cloth and the lower layer of release cloth in the pultrusion process is realized in a circulating and reciprocating mode.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention has the functions of transverse positioning and longitudinal flattening, reliable positioning, controllable pressure and high comprehensive positioning efficiency.

2. The invention utilizes the positioning groove of the positioning block to be matched with the soft pressing plate for positioning, solves the problem that the through groove in the existing positioning device damages the surface of the release cloth, and simultaneously increases the positioning reliability.

3. The invention does not need to wind the S-shaped passing roller in the feeding process, has simpler and more efficient positioning and easier control of the surface tension of the release cloth.

4. The invention applies pressure by utilizing the cooperation of the spring and the soft pressing plate, so that the surface pressure distribution of the release cloth is more uniform, and the possibility of transverse deflection is smaller.

5. According to the invention, the lifting movement of the top outer frame and the bottom outer frame is realized through the cooperation of the adjusting mechanism and the lifting mechanism, the movement precision is higher, and the movement process is more controllable.

6. According to the invention, through the cooperation of the gear and the rack, the synchronous reciprocating motion of the upper soft pressing plate and the lower soft pressing plate is more stable.

7. The invention realizes the high-precision and high-efficiency positioning of the demolding cloth on the upper side and the lower side in the process of drawing and extruding the closed section thin-wall structure.

Drawings

FIG. 1 is an isometric view of a release liner positioning device for a closed section thin wall structure pultrusion process of the present invention;

FIG. 2 is a front view of a release liner positioning device for a closed section thin wall structure pultrusion process of the present invention;

fig. 3 is a schematic structural diagram of a lifting mechanism in the present embodiment;

FIG. 4 is a schematic structural view of the positioning mechanism in the present embodiment;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial enlarged view at B in FIG. 4;

FIG. 7 is a front view of the soft platen in this embodiment;

FIG. 8 is an isometric view of a feed mechanism in this embodiment;

FIG. 9 is a front view of the feeding mechanism in the present embodiment;

FIG. 10 is a front view of the winding mechanism in the present embodiment;

FIG. 11 is a schematic view of the rear support assembly according to the present embodiment;

FIG. 12 is a flow chart of a method for positioning a release liner positioning device for a closed section thin wall structure pultrusion process of the present invention.

Detailed Description

The invention is described in further detail below with reference to the attached drawings and embodiments:

reference numerals in the drawings of the specification include: 1-a base; 2-a front end support frame; 3-a feeding mechanism; 301-a feeding transmission shaft; 302-a feed roll; 303-guiding rollers; 4-a positioning mechanism; 401-positioning a flat plate; 402-positioning blocks; 403-soft press plate; 404-a spring; 405-a hard platen; 406A-top outer frame; 406B-a bottom outer frame; 407-gear; 408-a rack; 409-a gear drive shaft; 501-positioning a servo motor; 502-a coupling; 503-worm gear; 504-worm drive shaft; 6-a lifting mechanism; 601-a lead screw; 602-lifting the nut; 7-a winding mechanism; 701-winding a winding drum; 8-core mold; 9-rear end support assembly.

As shown in fig. 1 and 2, a release cloth positioning device for a closed section thin-wall structure pultrusion process comprises a base 1, wherein a front end support frame 2, a feeding mechanism 3, a positioning mechanism 4, a rear end support assembly 9 and a winding mechanism 7 are sequentially arranged on the base 1 from left to right. The base 1 is horizontally installed on the ground. The front end support frame 2 adopts I-steel, and the front end support frame 2 is welded on the base 1. The feeding mechanism 3 comprises a supporting frame and a feeding servo motor (the feeding servo motor is not shown in the figures, as shown in the figures 8 and 9), the supporting frame is connected to the base 1 through bolts, two feeding drums 302 and a guide roller 303 positioned on one side of each feeding drum 302 are rotatably connected to the supporting frame through a feeding transmission shaft 301, and the feeding servo motor is coaxially connected with a feeding transmission shaft. The length of the guide roller 303 corresponds to the width of the release cloth.

As shown in fig. 4 to 6, the positioning mechanism 4 is used for positioning the release cloth fed out from 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 flat plate 401 is arranged at the left side of the feeding mechanism 3 through the front end supporting frame 2, the right end of the positioning flat plate 401 is connected with a core mold 8 (demolding cloth is not shown in fig. 1, 2 and 4), and the upper layer of demolding cloth and the lower layer of demolding cloth can be prevented from being completely attached at the position by the aid of the positioning flat plate 401; meanwhile, one end of the positioning flat plate 401 is connected with the front end supporting frame 2, and the other end of the positioning flat plate 401 is connected with the core mould 8, so that the end part of the core mould 8 is supported. The front side and the rear side of the positioning plate 401 are both connected with positioning blocks 402 by bolts, and the upper side and the lower side of each positioning block 402 are both provided with positioning grooves. The front and rear sides of the positioning plate 401 are also provided with slide ways for sliding the top outer frame 406A and the bottom outer frame 406B. The top outer frame 406A and the bottom outer frame 406B are both in a U-shaped structure, and two free ends of the top outer frame 406A and the bottom outer frame 406B are both provided with openings for sliding of the top outer frame 406A or the bottom outer frame 406B, and one sides, which are not opened, of the free ends of the top outer frame 406A and the bottom outer frame 406B are slidably connected in corresponding slide ways. An adjusting mechanism for adjusting the distance between the top outer frame 406A and the bottom outer frame 406B is arranged between the top outer frame 406A and the bottom outer frame 406B, the adjusting mechanism comprises four racks 408, two gears 407 and a lifting mechanism 6, the four racks 408 are respectively arranged 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 rotationally connected on the two outer side walls of the positioning flat plate 401 through two gear transmission shafts 409, and each gear 407 is simultaneously meshed and connected with the two racks 408 on the same side.

As shown in fig. 3 and 4, the lifting mechanism 6 is configured to drive the bottom outer frame 406B to lift up and down. The lifting mechanism 6 comprises a positioning servo motor 501, a worm transmission shaft 504, two worm gears 503, a screw 601 and a lifting nut 602. The positioning servo motor 501 is connected to the base 1 through a bolt, the worm transmission shaft 504 is coaxially connected to an output shaft of the positioning servo motor 501 through a coupling 502, bearings and bearing sleeves (not shown) are arranged at two ends of the worm transmission shaft 504, and the bearing sleeves are connected to the base 1 through bolts. Two worm gears 503 are arranged on the base 1 at intervals, and each worm gear 503 is meshed with a worm transmission shaft 504. The screw 601 is connected with the worm wheel 503 through a flat key, and the screw 601 is rotatably connected with the base 1. The lifting nut 602 is in threaded connection with the lead screw 601, and the lifting nut 602 is connected with the bottom outer frame 406B through bolts.

The top outer frame 406A and the bottom outer frame 406B are both connected with hard pressing plates 405 through bolts, each hard pressing plate 405 is connected with two springs 404 at intervals, and the two springs 404 are connected with soft pressing plates 403 (shown in fig. 7) located in the top outer frame 406A or the bottom outer frame 406B. The protruding made of silicon rubber is arranged on each soft pressing plate 403, the protruding shape is arc, the protruding length is the same with the width of the demolding cloth, the protruding thickness is slightly larger than the height of the positioning groove, and therefore protruding two sides of the protruding pressed piece are prevented from being extruded into the positioning groove in the extrusion positioning process, and the follow-up protruding piece is driven to lift up to bring the demolding cloth to slide out of the positioning groove, so that inaccurate positioning is caused.

As shown in fig. 10 and 11, the rear end supporting component 9 is arranged at the left side of the winding mechanism 7, the rear end supporting component 9 is composed of a fixed plate and two supporting plates welded on the fixed plate, and rollers are connected between the two supporting plates through bearings; the rear end support member 9 can provide an appropriate supporting force for the core mold 8 and keep the release cloth smoothly moving. The winding mechanism 7 is disposed on the right side of the base 1, and the winding mechanism 7 includes a winding servo motor (not shown in fig. 10) and a winding drum 701 coaxially connected to the winding servo motor. The winding servo motor is coaxially connected with a winding drum through a coupler 502, the winding drum 701 is rotationally connected with a U-shaped frame, and the U-shaped frame is connected to the base 1 through bolts.

As shown in fig. 12, the positioning method of the release cloth positioning device:

s1, respectively rolling the upper layer of demolding cloth and the lower layer of demolding cloth onto two feeding drums 302, stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a positioning flat plate 401 by bypassing a guide roller 303, stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a storage drum along a pultrusion core mold 8 by passing through a positioning groove in a corresponding positioning block 402, connecting the end parts of the upper layer of demolding cloth and the lower layer of demolding cloth with the storage drum, setting the descending distance of a soft pressing plate 403 according to the thickness of the demolding cloth and the height of the positioning groove in the positioning block 402, and multiplying the result by a coefficient of 1.2-1.5.

S2, starting a feeding servo motor and a winding servo motor, wherein the feeding servo motor drives a feeding drum 302 to rotate, a certain length of release cloth is conveyed along the pultrusion direction, the winding servo motor drives a winding drum 701 to rotate, a certain length of release cloth is stored along the pultrusion direction, and each feeding and winding operation is separated by a curing cycle time (namely a cycle period).

S3, when the upper layer of new demolding cloth and the lower layer of new demolding cloth are conveyed to the positioning mechanism 4, the positioning servo motor 501 drives the worm transmission shaft 504 to rotate through the coupler 502, the worm transmission shaft 504 drives the worm wheel 503 and the lead screw 601 to rotate circumferentially, the lead screw 601 rotates to drive the lifting nut 602 to vertically lift, the bottom outer frame 406B is further driven to vertically descend through the cooperation of the gear 407 and the rack 408, and the hard pressing plate 405 of the top outer frame 406A and the hard pressing plate 405 of the bottom outer frame 406B synchronously move in opposite directions; the hard pressing plate 405 moves in opposite directions to drive the springs 404 to move in opposite directions, so as to drive the upper soft pressing plate 403 and the lower soft pressing plate 403 to move in opposite directions with the protrusions, the upper protrusions and the lower protrusions squeeze the release cloths on the upper layer and the lower layer of the positioning plate 401, when the soft pressing plate 403 descends to a set distance, the left sides and the right sides of the protrusions squeeze to the positioning grooves on the inner sides of the positioning blocks 402, and the transverse shrinkage of the release cloths in the pultrusion process is restrained until the protrusions are attached to the surfaces of the positioning plate 401.

S4, after the bottoms of the protrusions are completely attached to the surface of the positioning flat plate 401, the protrusions stay for 3 seconds, so that the release cloth can be attached to the positioning flat plate 401 better, and when prepreg is fed in subsequently, the release cloth can be attached to resin on the surface of the prepreg better. The positioning servo motor 501 rotates in a micro reverse way, the worm transmission shaft 504 is driven to rotate in a reverse way, the worm wheel 503 and the lead screw 601 are driven to rotate in a reverse way, the lifting nut 602 is driven to descend, the bottom outer frame 406B is driven to ascend by the cooperation of the gear 407 and the rack 408, the upper and lower soft pressing plates 403 move back to be far away from the positioning flat plate 401, after the protrusions on the soft pressing plates 403 withdraw from the release cloth, the positioning servo motor 501 stops working, the feeding servo motor and the winding servo motor continue to rotate in a forward way, the release cloth which is positioned enters a curing area along the pultrusion direction, new release cloth moves from the feeding drum 302 to the positioning area, and the two layers of release cloth are circularly reciprocated, so that the accurate positioning of the upper and lower layers of release cloth in the pultrusion process is realized.

The foregoing is merely exemplary of the present invention and embodiments of the present invention are not described herein in any way with reference to common general knowledge of the particular technical scheme or characteristics. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present invention, and these should also be regarded as the protection scope of the present invention, which does not affect the effect of the implementation of the present invention and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (7)

1. The utility model provides a drawing of patterns cloth positioner of closed cross-section thin wall structure pultrusion technology which characterized in that: the feeding mechanism comprises a supporting frame and a feeding servo motor, wherein the supporting frame is connected to the base through bolts, two feeding drums and a guide roller wheel positioned on one side of each feeding drum are rotatably connected to the supporting frame, and the feeding servo motor is coaxially connected with each feeding drum; the positioning mechanism is used for positioning the demolding cloth sent out by the feeding mechanism, the winding mechanism is arranged on one side far away from the feeding mechanism and comprises a winding servo motor and a winding drum coaxially connected with the winding servo motor, and the winding drum is fixed on the base through a bracket.

2. The release liner positioning device for a closed section thin wall structure pultrusion process according to claim 1, wherein the release liner positioning device is characterized in that: the positioning mechanism comprises a positioning flat plate, a top outer frame and a bottom outer frame, wherein one end of the positioning flat plate is connected with a supporting frame positioned on the other side of the front end feeding mechanism, the supporting frame is connected to a base through bolts, the other end of the positioning flat plate is connected with a core mold, two sides of the positioning flat plate are connected with positioning blocks through bolts, positioning grooves are formed in the positioning blocks, an adjusting mechanism used 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.

3. The release liner positioning device for a closed section thin wall structure pultrusion process according to claim 2, wherein the release liner positioning device is characterized in that: each soft pressing plate is provided with a bulge made of silicon rubber, the bulge is arc-shaped, the length of the bulge is the same as the width of the demolding cloth, and the thickness of the bulge is greater than the height of the positioning groove.

4. The release liner positioning device for a closed section thin wall structure pultrusion process according to claim 2, wherein the release liner positioning device is characterized in that: the adjusting mechanism comprises two racks, gears and a lifting mechanism, wherein the two racks are respectively arranged on the top outer frame and the bottom outer frame, the gears are rotationally connected to the positioning flat plate, the gears are simultaneously meshed with the two racks, slide ways for sliding the top outer frame and the bottom outer frame are arranged on two sides of the positioning flat plate, and the lifting mechanism is used for driving the bottom outer frame to lift up and down.

5. The release liner positioning device for a closed-section thin-wall structure pultrusion process according to claim 4, wherein the release liner positioning device is characterized in that: the lifting mechanism comprises a positioning servo motor, a worm transmission shaft, a worm wheel, a screw rod and a lifting nut, wherein the positioning servo motor is connected to the base through a bolt, the worm transmission shaft is coaxially connected to an output shaft of the positioning servo motor, the worm wheel is meshed with the worm transmission shaft, the screw rod is connected with the worm wheel, the lifting nut is connected with the screw rod through a thread, and the lifting nut is connected with the bottom outer frame through a bolt.

6. The release liner positioning device for a closed-section thin-wall structure pultrusion process according to claim 5, wherein the release liner positioning device is characterized in that: the top outer frame and the bottom outer frame are internally connected with hard pressing plates, and springs are connected between each hard pressing plate and the corresponding soft pressing plate.

7. A release liner positioning device for a closed section thin wall structure pultrusion process according to any of claims 2-6, characterized in that: the positioning method of the release cloth positioning device comprises the following steps:

s1, respectively rolling an upper layer of demolding cloth and a lower layer of demolding cloth onto two feeding drums, stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a positioning flat plate by bypassing a guide roller, simultaneously stretching the upper layer of demolding cloth and the lower layer of demolding cloth to a storage drum along a pultrusion mold through a corresponding positioning groove, connecting the ends of the upper layer of demolding cloth and the lower layer of demolding cloth with the storage drum, and setting the descending distance of a soft pressing plate according to the thickness of the demolding cloth and the height of the positioning groove in a positioning block;

s2, starting a feeding servo motor and a winding servo motor, wherein the feeding servo motor drives a feeding drum to rotate, a certain length of release cloth is conveyed along the pultrusion direction, the winding servo motor drives a winding drum to rotate, a certain length of release cloth is stored along the pultrusion direction, and each feeding and winding operation is separated by a curing cycle time;

s3, when the upper layer of new release cloth and the lower layer of new release cloth are conveyed to the positioning mechanism, the distance between the two soft pressing plates is adjusted through the adjusting mechanism, and the release cloths on the upper side and the lower side are extruded by the soft pressing plates;

s4, when the soft pressing plate is completely attached to the surface of the positioning flat plate and then stays for 3 seconds, the soft pressing plate is driven by the adjusting mechanism to separate from the release cloth, the feeding servo motor and the winding servo motor continue to rotate positively, the positioned release cloth enters the curing area along the pultrusion direction, the new release cloth moves from the feeding winding drum to the positioning area, and the positioning of the upper layer of release cloth and the lower layer of release cloth in the pultrusion process is realized in a circulating and reciprocating mode.

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