Bonding device for precisely centering double-cantilever-beam hinge and enabling double-cantilever-beam hinge to be consistent with glue layer in thickness

Abstract

The invention relates to a bonding device for precisely centering a double-cantilever-beam hinge and enabling the double-cantilever-beam hinge to be consistent with a glue layer in thickness, in particular to a device for bonding a test piece hinge in a double-cantilever-beam test. The invention aims to provide a device capable of assisting in hinge adhesion before a double-cantilever beam test so as to realize consistent thickness of a hinge adhesive layer on a pre-cracking side of a test piece, and the device comprises a workbench, a synchronous belt power input module, a hinge adhesion clamping module and a sample piece cam bias module. The workbench is used for connecting and bearing basic platforms of other mechanisms; the synchronous belt power input module is used as a power input mechanism; the hinge bonding and clamping module is used for keeping the bonding state of the hinge and the test piece; and the sample piece cam offset module is used for uniformly smearing the adhesive layer. By means of the structure, the hinge pasting efficiency is remarkably improved, the production cost is reduced, and accurate centering pasting of the hinge on the sample piece and consistent thickness of a pasting adhesive layer are achieved.

Description

Technical Field

[0001] This invention relates to the field of bonding stacked carbon fiber fabric double cantilever beam experimental hinges, and more specifically to a bonding device for precisely aligning double cantilever beam hinges with adhesive layer thickness. Background Technology

[0002] Carbon fiber composites are widely used in aerospace, rail transportation, and other fields due to their high specific strength and high specific modulus. However, for stacked carbon fiber composite laminates, the interlamins are only bonded by a resin matrix with a strength far lower than that of the fiber reinforcement. Under impact, fatigue, and other loads, delamination damage is likely to occur, potentially leading to catastrophic failure. Therefore, accurately assessing the interlaminar mechanical properties is a crucial aspect of structural design. The double cantilever beam test, by applying a Type I opening load to the interlaminar layers, has become a standard test method for evaluating the Type I interlaminar fracture toughness of composite materials. This test requires symmetrical hinges on both sides of the pre-cracked specimen to ensure that the lines of action of the two loads are the same, achieving a pure Type I loading condition. However, current manual operations make it difficult to ensure symmetrical hinge arrangement, causing additional torsional or bending loads on the specimen under load, introducing Type II slip-out or Type III tear-out shear components, affecting test accuracy. Furthermore, manual bonding is costly, inefficient, and results in poor consistency in the adhesive layer thickness of each hinge in the same batch of samples. Therefore, there is an urgent need to design an efficient bonding device for the hinges of double cantilever beam test specimens that ensures parallelism, precise centering, and consistent adhesive layer thickness, in order to overcome the defects of manual operation and improve the accuracy of double cantilever beam test results. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problems of high cost, low efficiency and poor bonding effect of manual sewing in the prior art, and to provide a bonding device for double cantilever beam hinges with precise centering and consistent adhesive layer thickness.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bonding device for precise alignment of double cantilever beam hinges with consistent adhesive layer thickness includes a worktable, a synchronous belt power input module, a hinge bonding and clamping module, and a sample cam offset module. The worktable serves as the base platform connecting and supporting the other mechanisms. A synchronous belt power input mechanism providing power is located above the worktable. This module includes a motor, motor bracket, double-ended screw, guide rod, small pulley, double-layer pulley, large pulley, small synchronous belt, large synchronous belt, and cover plate. The small synchronous belt meshes with the small pulley and the upper layer of the double-layer pulley, while the large synchronous belt meshes with the lower layer of the double-layer synchronous belt and the large pulley. During operation, the large and small synchronous belt transmission system transmits the power input from the motor to the double-ended screw. Because the double-ended screw is connected to the upper and lower cover plates via a threaded pair, and the cover plates are constrained by the guide rod, the rotational motion of the motor is precisely converted into synchronous, opposite, or reverse linear motion of the upper and lower cover plates along the guide rod. This provides crucial power and displacement conditions for the precise alignment and synchronous pasting of the hinges onto the specimen. The hinge pasting and clamping module is symmetrically installed on the upper and lower cover plates, including a slot, a buckle, an adhesive strip, and a specimen placement plate. The adhesive strip fixes the hinge in the groove in the middle of the buckle and slot, and the specimen placement plate... Used for arranging multiple samples, the buckles and slots form a buckling mechanism. During the hinge pasting process, they move with the cover plate, causing the hinges to move closer to the samples. When the hinges contact and press against the surface of the glued sample, the locking strips on the buckles can simultaneously insert into the transverse grooves of the slots, achieving self-locking of the mechanism. This ensures that the relative positions of the hinges and samples are stably maintained before the adhesive layer cures. Disassembly is easy; simply press the locking strips inward. Sample cam offset modules are symmetrically distributed on both sides of the worktable. These modules simulate manual uniform coating. The process of applying the adhesive involves a rack, gear, turntable, and stud. When the hinge makes slight contact with the test piece, it pushes the rack in a linear reciprocating motion. The rack drives the gear meshing with it to rotate, which in turn drives the turntable, which is fixed coaxially with the gear, and the stud mounted on the turntable to move. This forms a cam mechanism. This mechanism converts the reciprocating motion of the rack into micro-movement of the test piece's plane, so that the adhesive between the hinge and the test piece is uniformly rolled and spread, thereby effectively ensuring the consistency and uniformity of the final adhesive layer thickness of the hinge.

[0006] Preferably, the double-ended screw has a smaller pitch in the middle section and a larger pitch further away from the middle section. This structure allows the upper and lower cover plates to move precisely and smoothly together when moving close to each other, and to separate quickly when moving far apart, effectively improving hinge pasting efficiency.

[0007] Preferably, the rack has grooves on both sides that cooperate with the cylindrical bosses on the base plate to ensure that the rack maintains stable linear motion during movement.

[0008] Preferably, the adhesive layer is made of blue nail adhesive with low tack, which can reliably fix the hinge to the buckle and the slot, and facilitate subsequent disassembly.

[0009] In the above technical solution, the bonding device for precise alignment of a double cantilever beam hinge with adhesive layer thickness provided by the present invention has the following beneficial effects:

[0010] 1. Through the precise transmission of the synchronous belt power input module, the two hinges were synchronously and accurately pasted to both sides of the pre-cracked end of the specimen, effectively ensuring the centering accuracy and pasting consistency.

[0011] 2. By restricting the hinge's degree of freedom through the groove structure of the buckle and slot, and in conjunction with the groove of the specimen placement plate to restrict the specimen's degree of freedom, the centering and overall stability during the hinge pasting process are significantly improved.

[0012] 3. The hinge bonding and clamping module has a multi-station design, which supports the simultaneous installation of multiple hinges and test pieces. The module can also be completely disassembled and replaced with a spare module, enabling continuous operation and greatly improving bonding efficiency.

[0013] 4. By using the cam translation mechanism of the sample cam offset module, uniform control of the adhesive layer thickness on both sides of the sample was achieved, ensuring the reliability of the bonding quality from a process perspective. Attached Figure Description

[0014] Figure 1 A perspective view of an adhesive bonding device for precise centering of a double cantilever beam hinge with adhesive layer thickness consistent with the actual centering;

[0015] Figure 2 This is a schematic diagram of the synchronous belt power input module in an adhesive bonding device for precise alignment of a double cantilever beam hinge with consistent adhesive layer thickness, provided in an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the hinge bonding clamping module in a bonding device for precise alignment of double cantilever beam hinges with adhesive layer thickness provided in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the cam offset module in a bonding device for precise alignment of a double cantilever beam hinge with adhesive layer thickness, provided in an embodiment of the present invention.

[0018] Figure 5 for Figure 4 Enlarged view of the area marked A in the middle;

[0019] Figure 6 This is a schematic diagram of a double-ended screw.

[0020] Figure label:

[0021] 1. Workbench; 2. Synchronous belt power input module; 3. Hinge bonding and clamping module; 4. Hinge bonding and clamping module; 21. Motor bracket; 22. Motor; 23. Double-ended screw; 24. Guide rod; 25. Small pulley; 26. Double-layer pulley; 27. Large pulley; 28. Small synchronous belt; 29. ​​Large synchronous belt; 210. Cover plate; 31. Slot; 32. Buckle; 33. Adhesive layer; 34. Specimen placement plate; 311. Horizontal groove; 321. Clip; 41. Rack; 42. Gear; 43. Turntable; 44. Stud. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the accompanying drawings. Figure 1 To be continued Figure 6 The present invention will now be described in further detail.

[0023] A bonding device for precise centering of double cantilever beam hinges with consistent adhesive layer thickness includes a worktable 1, a synchronous belt power input module 2, a hinge bonding and clamping module 3, and a specimen cam offset module 4.

[0024] The workbench 1 serves as the basic platform for connecting and supporting the other mechanisms. The synchronous belt power input module 2 is located above the workbench 1. The synchronous belt power input module 2 includes a motor 21, a motor bracket 22, a double-ended screw 23, a guide rod 24, a small pulley 25, a double-layer pulley 26, a large pulley 27, a small synchronous belt 28, a large synchronous belt 29, and a cover plate 210. The motor 21 is mounted on the left side of the workbench 1 via the motor bracket 22. The small pulley 25 is mounted on the output shaft of the motor 21. There are two double-ended screws 23, which are symmetrically mounted on the left and right sides of the workbench 1. There are four guide rods 24, which are symmetrically placed on the left and right sides of each double-ended screw 23. The double-layer pulley 206 is mounted on the left double-ended screw 23, and the large pulley 27 is mounted on the right double-ended screw 23. Above 23, the small synchronous belt 28 meshes with the upper layer of the small pulley 25 and the double-layer pulley 26, forming a small synchronous belt drive system. The large synchronous belt 29 meshes with the lower layer of the double-layer pulley 206 and the large pulley 27, forming a large synchronous belt drive system. There are two cover plates 210, which are symmetrically connected to the double-ended screw 23 through threaded pairs. When the device is working, the power input from the motor 21 is transmitted to the double-ended screw 23 through the large and small synchronous belt drive systems, driving the rotation of the double-ended screw 23. Since the upper and lower threads of the double-ended screw 23 rotate in opposite directions, under the constraint of the guide rod 24, the upper and lower cover plates 210 can move in precise linear motion in opposite directions along the guide rod 24, thus providing the core motion guarantee for achieving synchronous centering and precise pasting of the hinge 6.

[0025] The hinge pasting and clamping module 3 is symmetrically installed on the upper and lower cover plates 210, including a slot 31, a buckle 32, adhesive strips 33, and a specimen placement plate 34. There are eight adhesive strips 33, located on the front and upper sides of the slot 31 and the front and lower sides of the buckle 32 in each hinge pasting and clamping module. These strips are used to fix the hinge in the grooves in the middle of the buckle 32 and slot 31, and to keep the two hinge leaves perpendicular. The specimen placement plate 34 is used to place multiple specimens 5. The slot 31 and buckle 32... Together, they form a self-locking buckle mechanism. During the bonding process, they move with the cover plate 210, causing the hinge 6 to move closer to the test piece 5. When the hinge 6 contacts and presses against the test piece 5, the locking strip 321 on the buckle 32 will simultaneously insert into the transverse groove 311 of the slot 31, achieving mechanical self-locking. This design can stably maintain the relative position of the hinge 6 and the test piece 5 before the adhesive layer solidifies, ensuring the bonding quality. When disassembling, the self-locking can be easily released by simply pressing the locking strip 321 inward, making the operation very convenient.

[0026] The specimen cam offset module 4 is symmetrically distributed on the front and rear sides of the worktable 1. The module simulates the process of manually and evenly applying colloid. It includes racks 41, gears 42, turntables 43, and studs 44. There are two racks 41, which are symmetrically placed in the rectangular slots of the worktable 1. The gears 42, turntables 43, and studs 44 form a cam mechanism, and there are four of each. They are symmetrically installed on the circular slots of the worktable 1. The gears 42 are installed on the cylindrical boss below the turntables 43. The studs 44 are installed in the circular holes above the turntables 43. 3. The main body is supported in the round hole of the workbench 1 by bearings to ensure that it can rotate flexibly. When the hinge 6 slightly contacts the test piece 5, it pushes the rack 41 in a linear reciprocating motion. The rack 41 meshes with the gear 42, which drives the gear 42 to rotate. This causes the cam mechanism composed of the turntable 43 and the stud 44 to operate, thereby driving the test piece 5 to produce planar micro-motion. This micro-motion causes the adhesive between the test piece 5 and the hinge 6 to be repeatedly rolled and spread, thereby achieving uniform distribution of the adhesive and effectively ensuring the consistency and uniformity of the final adhesive layer.

[0027] The threads on both sides of the double-headed screw 23 rotate in opposite directions, enabling the upper and lower cover plates to move in opposite directions or in the opposite direction.

[0028] The hinge pasting and clamping module 3 can be disassembled and replaced, which improves the ease of operation.

[0029] The double-headed screw 23 has a smaller pitch in the middle section and a larger pitch further away from the middle section, enabling the upper and lower cover plates to move precisely and smoothly when moving close together, and to separate quickly when moving far apart, effectively improving the hinge pasting efficiency.

[0030] The working process of this invention:

[0031] The operation of this equipment consists of four parts: resetting, placing the test piece and hinge, hinge bonding, and replacing the hinge bonding and clamping module.

[0032] The first step is reset. The purpose of this stage is to separate the upper and lower cover plates 210 to the maximum distance, reserving operating space for subsequent placement of the specimen and hinges. During operation, the start motor 22 is reversed (set to the direction that moves the upper and lower cover plates 210 away from each other). The synchronous belt power input module 2 receives power input and starts to operate. The small pulley 25 transmits power to the double-layer pulley 26 through engagement with the small synchronous belt 28. The double-layer pulley 26 transmits power to the large pulley 27 through engagement with the large synchronous belt 29. At this time, the double-layer pulley 26 and the large pulley 27 transmit power to the double-ended screw 23 through transitional engagement with the double-ended screw 23. Under the drive of the threaded pair and the constraint of the guide rod 24, the upper and lower cover plates 210 move synchronously in opposite directions. When the distance between the upper and lower cover plates 210 reaches the maximum, the motor 22 is turned off, and the device remains stationary.

[0033] Next is the placement of the test pieces and hinges. This step involves placing the test pieces and hinges and applying adhesive. The two hinge pieces are vertically fixed in each groove of the buckle 32 and the slot 31 using blue nail adhesive to prevent them from falling off during operation. Multiple test pieces 5 are placed one by one in the rectangular groove of the test piece placement plate 34, ensuring that each test piece 5 is pushed to the bottom of the rectangular groove and positioned. After the above positioning is completed, an appropriate amount of adhesive is applied to the upper surface of the lower hinge and the upper surface of the test piece.

[0034] Next is the hinge application, which mainly involves attaching the hinge 6 to the specimen 5 and maintaining the attachment state. The motor 22 is started and rotated in the forward direction. The upper and lower cover plates 210 drive the buckles 32 and slots 31 to move in a straight line towards each other. When the hinge slightly touches the specimen, it reciprocates to push the rack 41 of the cam offset module 4. The rack 41 meshes with the gear 42, which drives the turntable 43 to start rotating. The turntable 43 causes the specimen to make slight planar movements through the studs 44, so that the adhesive is evenly applied between the specimen 5 and the hinge 6. The rack 41 is returned to its original position, and the motor 22 is started again to rotate in the forward direction. When the buckles 32 and slots 31 complete self-locking, the motor 22 stops rotating.

[0035] Finally, the hinge bonding clamping module is replaced. This mainly involves removing the hinge bonding clamping module 3 and installing another set of hinge bonding clamping modules 3. By unscrewing the bolts connecting the buckle 32 and the upper cover plate 210, the bolts connecting the slot 31 and the lower cover plate 210, and the nuts connecting the specimen placement plate 34 and the studs 44, the hinge bonding clamping module 3, along with the hinge and the specimen, can be removed. The motor 22 is then started to reverse, increasing the distance between the upper and lower cover plates 210 to the maximum. The other two sets of hinge bonding clamping modules 3 are then placed in the positions described above. The bolts and nuts are tightened, and the next round of bonding operations can begin.

[0036] Repeat the above steps to complete the work of pasting the hinges 6 onto the other test pieces 5. After the glue has completely solidified, press the clip strip 321 of the buckle inward to release the slot 31 and the buckle 32, and obtain the test piece 5 with the two hinges 6 pasted on.

[0037] The foregoing description illustrates preferred embodiments of the present invention. However, it should be understood that the present invention is not limited to the specific forms disclosed herein, which means that other embodiments are not excluded. In fact, the present invention can be applied to many different combinations, modifications, and environments, and can be modified accordingly within the scope of the inventive concept described herein, based on the foregoing teachings or related field techniques or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be included within the protection scope of the appended claims.

Claims

1. A bonding device for precise centering of a double cantilever beam hinge with adhesive layer thickness consistent with the desired thickness, characterized in that: It includes a workbench 1, a synchronous belt power input module 2, a hinge bonding and clamping module 3, and a sample cam offset module 4; the workbench 1 serves as the basic platform for connecting and supporting the other mechanisms; the synchronous belt power input module 2 includes a motor 21, a motor bracket 22, a double-ended screw 23, a guide rod 24, a small pulley 25, a double-layer pulley 26, a large pulley 27, a small synchronous belt 28, a large synchronous belt 29, and a cover plate 210. The motor 21 is connected to the left side of the workbench 1 through the motor bracket 22, and there are two double-ended screws 23, symmetrically arranged on both sides. The shaft is fixed to the worktable 1 by bearings. There are four guide rods 24, one on each side of each double-ended screw 23. The small pulley 25 forms a transition fit with the output shaft of the motor 21. The double-layer pulley 26 forms a transition fit with the left double-ended screw 23. The large pulley 27 forms a transition fit with the right double-ended screw 23. The small synchronous belt 28 meshes with the small pulley 25 and the upper layer of the double-layer pulley 26. The large synchronous belt 29 meshes with the lower layer of the double-layer pulley 26 and the large pulley 27. The cover plate 210 is symmetrically placed on the double-ended screws via threaded pairs. On the threaded section of 23; the hinge adhesive clamping module 3 includes a slot 31, a buckle 32, an adhesive strip 33, and a specimen placement plate 34. There are two hinge adhesive clamping modules 3. The slot 31 is detachably connected to the lower cover plate via bolts, and the buckle 32 is detachably connected to the upper cover plate via bolts. The slot 31 and buckle 32 can form a detachable connection, maintaining the adhesive state between the hinge and the specimen through a self-locking structure. The adhesive strip 33 is attached to the front and upper sides of the slot 31, and the front and lower sides of the buckle 32; the specimen cam offset module 4... Distributed on the front and back sides of workbench 1, the module simulates the process of applying glue evenly by hand and includes rack 41, gear 42, turntable 43 and stud 44. There are two racks 41, which are symmetrically placed on workbench 1. There are grooves on the left and right sides of the racks 41. The groove surfaces are tangent to the cylindrical bosses on workbench 1 and form a sliding fit. Gear 42 meshes with rack 41 and forms a transition fit with turntable 43. Stud 44 forms a transition fit with turntable 43. There are four gears 42, turntable 43 and stud 44, which are symmetrically placed on workbench 1.

2. The bonding device for precise centering and consistent adhesive layer thickness of a double cantilever beam hinge according to claim 1, characterized in that: The hinge bonding clamping module 3 is detachably connected to the cover plate 210 and the stud 44. The hinge bonding clamping module 3 can be replaced after locking the hinge 6 and the test piece 5.

3. The bonding device for precise centering and consistent adhesive layer thickness of a double cantilever beam hinge according to claim 1, characterized in that: The buckle 32, the slot 31 and the specimen placement plate 34 have multiple stations, which can attach hinges 6 to multiple specimens 5 at the same time.

4. The bonding device for precise centering of a double cantilever beam hinge with adhesive layer thickness as described in claim 1, characterized in that: The synchronous drive input module 2 causes the slot 31 and latch 32 to move simultaneously, at which time the upper and lower hinges 6 move synchronously towards the center or away from each other.

5. The bonding device for precise centering and consistent adhesive layer thickness of a double cantilever beam hinge according to claim 1, characterized in that: The double-headed screw 23 has a smaller pitch in the middle section and a larger pitch further away from the middle section. This structure allows the upper and lower cover plates 210 to move closer and closer precisely and smoothly, and to separate quickly when moving at a distance.

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