An adaptive last surfacing apparatus
By using the bottom adaptive structure and clamping mechanism of the adaptive shoe last fixing device, the problem of unstable shoe last clamping is solved, and stable clamping and efficient processing of different shoe lasts are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WENZHOU RUI XING SHOES
- Filing Date
- 2026-05-15
- Publication Date
- 2026-06-12
AI Technical Summary
Existing shoe last clamping devices cannot adapt to the individual differences of different types of shoe lasts, especially the diversity of shoe last bottom shapes, resulting in unstable clamping and wear of the drive mechanism.
An adaptive shoe last fixing device is adopted, including a bottom adaptive structure, a first clamping mechanism and a second clamping mechanism. The adaptive fit of the bottom of the shoe last is achieved through airbags and elastic ball head components. Combined with flexible claws and wedge block mechanisms, stable clamping of different shoe lasts is achieved.
It achieves stable clamping of different shoe lasts, reduces the need for manual adjustment, improves production efficiency, and reduces the risk of clamping position deviation and wear of the drive mechanism.
Smart Images
Figure CN122185079A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shoe last processing equipment technology, and specifically to an adaptive shoe last surface processing equipment. Background Technology
[0002] Shoe last surface processing equipment is a key piece of equipment in the shoe manufacturing industry used for the fine shaping of wooden or plastic shoe last blanks. Its core function is to process the shoe last to the precise curved contour and smoothness that meet the design requirements through processes such as CNC milling, sanding, or robotic polishing, ensuring that the shoe last size is highly consistent with the shoe pattern drawings, thereby directly affecting the fit and comfort of the finished shoe.
[0003] CN121267807A discloses a shoe last clamping device, relating to the field of automated shoemaking technology, to solve the problem of cumbersome clamping and adjustment for different shoe lasts. The shoe last clamping device includes a clamping jaw body and a clamping jaw driving mechanism for driving the clamping jaw body to clamp the shoe last. The clamping jaw body is configured to clamp the shoe last through a clamping surface with an angle of 68°~72° between the clamping surface and the bottom surface of the shoe last. This configuration can accommodate most shoe lasts, eliminating the need for adjustment of the clamping device when changing shoe lasts. This technology uses a single driving mechanism to drive the clamping jaws to clamp the shoe last body, adapting to a certain range of shoe lasts through a specific angle. However, this technology, using two clamping jaws, still cannot properly clamp the surface of the shoe last. When applying the last to the surface, especially when fixing the bottom of the shoe last, there are many different shapes at both ends of the bottom surface for different types of shoe lasts. The size and depth of the grooves on both sides of the arch of the foot are different, and the shape of the bottom of the shoe last also varies from person to person. Therefore, this technology is still not suitable for all types of shoe lasts when processing the surface. At the same time, when the gripper acts on the processing equipment, the drive mechanism will wear due to the vibration during processing, which will cause the gripper to loosen its axis. Therefore, this technology still has some room for improvement. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide an adaptive shoe last surface processing device that can adapt to different types of shoe lasts, in order to address the shortcomings of the prior art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an adaptive shoe last surface processing device, comprising a surface processing apparatus and a shoe last fixing apparatus, wherein the shoe last fixing apparatus includes an indexing turntable disposed on one side of the surface processing apparatus, and a plurality of shoe last fixing seats are distributed on the indexing turntable, characterized in that: the shoe last fixing seat includes a fixing platform fixedly installed on the indexing turntable, the bottom of the fixing platform is provided with a bottom adaptive structure that can adapt to the shape of the bottom of the shoe last and fit against the bottom of the shoe last, and the fixing platform is provided with a first clamping mechanism that can be self-locking after clamping at the toe and heel of the shoe last and a second clamping mechanism that can adapt to different sides of the shoe last.
[0006] The above technical solution incorporates a bottom adaptive structure in the shoe last fixing base, which automatically conforms to the actual shape of different shoe last bottoms, solving the problem that the fixed angle clamping method cannot adapt to the different depths and sizes of the grooves on both sides of the arch and the individual differences in the shape of the shoe last bottom. A first clamping mechanism is set at the toe and heel, which can self-lock after clamping to prevent processing vibration from causing the clamping position to shift and the drive mechanism to wear, solving the problem of the clamping claw axis loosening caused by vibration in the original technology. At the same time, a second clamping mechanism that can adapt to the shape of different shoe last sides is set, so that the clamping surface keeps in close contact with the side of the shoe last, achieving stable clamping and surface processing for different types of shoe lasts without the need for tedious manual adjustments for different shoe lasts.
[0007] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the bottom adaptive structure includes an air cavity located at the bottom of the shoe last fixing seat within the indexing turntable, the air cavity having an air bladder, the air bladder having a floating plate at its top, the fixing table having a placement cavity for placing the shoe last, the bottom of the placement cavity having a plurality of elastic ball head assemblies, the surface of the placement cavity having an elastic membrane, the elastic ball head assemblies being placed within the elastic membrane, and the end of the elastic ball head assembly away from the elastic membrane being fixedly connected to the floating plate.
[0008] Using the above technical solution, an air chamber and an air bladder are set at the bottom of the fixed base. A floating plate is connected to the top of the air bladder. The floating plate is fixedly connected to the elastic ball head assembly at the bottom of the placement chamber. When the shoe last is placed into the placement chamber and the elastic membrane is compressed, the elastic ball head assembly is compressed under the pressure of the bottom of the shoe last and pushes the floating plate down to press the air bladder. The gas in the air bladder generates a reaction force to push the elastic ball head assembly back, so that the elastic ball head assembly always maintains a tight state against the protruding area of the bottom of the shoe last (such as the arch and the ball of the foot), thereby achieving full contact adaptive fit between the bottom of the shoe last and the fixed base, taking into account individual differences such as the curvature and groove of the bottom surface of different shoe lasts.
[0009] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the elastic ball head assembly includes a guide mounting post fixedly installed at one end with a floating plate and an elastic ball head; a ball head guide rod is provided at the bottom of the elastic ball head; a fixed bushing is provided on the side of the ball head guide rod facing the elastic ball head; a movable plate is provided on the outer periphery of the fixed bushing; the guide mounting post is provided with a plurality of movable posts; the movable plate is sleeved on the movable posts; the movable post is limited at the end facing the elastic ball head relative to the movable plate; an elastic element is provided between the movable plate and the guide movable post; one end of the elastic element abuts against the movable plate and the other end abuts against one side of the guide movable post; and the elastic ball head is placed on the surface of the placement groove.
[0010] Using the above technical solution, the elastic ball head is fixedly connected to the floating plate through the guide mounting column. The outer periphery of the ball head guide rod is provided with a fixed bushing, which is constrained by the moving plate. When different height areas of the bottom of the shoe last press on the elastic ball head, the ball head guide rod overcomes the elastic force of the elastic element and moves downward, so that each elastic ball head is independently adjusted to contact the bottom of the shoe last. It can provide elastic support for protruding areas such as the arch and the ball of the foot, as well as the bottom of the groove. At the same time, the moving column provides a limit to the moving plate to prevent the elastic element from being over-compressed, ensuring that the elastic ball head works within a reasonable stroke range, and improving the self-adaptive accuracy and structural reliability of the clamping.
[0011] The aforementioned adaptive shoe last surface processing equipment can be further configured such that: the end of the moving column is provided with a limiting end, the limiting end is the upper limit of the moving plate, and the guide moving column is the lower limit of the moving plate.
[0012] By adopting the above technical solution, a limiting end is set at the end of the moving column as the upper limit of the moving plate, and a guide mounting column is set as the lower limit of the moving plate. This limits the movement stroke of the moving plate to between the guide mounting column and the limiting end, thereby restricting the compression limit stroke of the elastic element. This prevents the elastic element from being over-compressed or over-rebounded in an uncontrolled state, which could lead to instability of the elastic ball head position. It ensures that each elastic ball head always moves within the effective working stroke range, improving the consistency of the clamping adaptive mechanism and its service life.
[0013] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the first clamping mechanism includes a first movable cylinder disposed on a fixed platform at the toe and heel of the shoe last; the end of the first movable cylinder is provided with a guide plate; the guide plate is provided with a gripper mounting plate; one side of the gripper mounting plate is fixedly connected to the first movable cylinder, and the other end is provided with a telescopic motor; the telescopic motor is provided with a locking structure; the end of the telescopic motor is provided with a gripper connecting plate; the two sides of the gripper mounting plate are hinged with first connecting arms; the end of the first connecting arm away from the gripper mounting plate is hinged with a second connecting arm; the gripper connecting plate is disposed between the second connecting arms; the output end of the telescopic motor passes through the gripper mounting plate and is connected to the gripper connecting plate; the second connecting arm is provided with a flexible gripper on the side facing the placement groove.
[0014] Using the above technical solution, the first clamping mechanism drives the guide plate through the first moving cylinder, which in turn moves the gripper mounting plate to achieve the extension and retraction of the gripper mechanism; the output end of the telescopic motor passes through the gripper mounting plate and connects to the gripper connecting plate, and forms a four-bar linkage through two sets of hinged first connecting arms and second connecting arms, which converts the linear output of the telescopic motor into the opening and closing motion of the gripper; the telescopic motor is equipped with a locking structure, which stops the motor and locks the output shaft after clamping in place, preventing the gripper from retracting under inertia or external force due to processing vibration, thus achieving self-locking clamping.
[0015] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the telescopic motor includes a motor body and a telescopic lead screw, the end of the telescopic lead screw is fixedly connected to a drive plate, a coil mounting shaft is provided at the end of the telescopic lead screw facing the motor body, a coil is provided inside the coil mounting shaft, a locking disc is sleeved on one side of the telescopic lead screw located on the coil mounting shaft, a moving disc and a fixed disc are respectively provided on both sides of the locking disc located on the coil mounting shaft, the locking disc is disposed between the moving disc and the fixed disc, the moving disc can reciprocate along the rope lead screw, and a first return spring is provided between the coil mounting shaft and the moving disc.
[0016] Using the above technical solution, the telescopic motor outputs power through a telescopic screw, and the locking structure uses an energized coil to generate electromagnetic force to drive the moving disk to move, causing the locking disk to switch positions between the moving disk and the fixed disk, thereby realizing the locking and unlocking of the telescopic screw. When the power is off, the first return spring pushes the moving disk to automatically reset, and the locking disk returns to the locked position, maintaining the locked state without external power or continuous power supply. This electromagnetic locking method relies on the friction of the disk surface for locking, which has a longer lifespan than a purely mechanical snap-fit structure, and does not require a motor to be continuously powered to maintain clamping.
[0017] The aforementioned adaptive shoe last surface processing equipment can be further configured such that: the flexible gripper includes a flexible surface in contact with the outer periphery of the shoe last and a rigid surface away from the outer periphery of the shoe last, and the flexible surface and the rigid surface are connected by a plurality of flexible piles.
[0018] Using the above technical solution, the flexible gripper is composed of a rigid surface and a flexible surface connected by several flexible posts. The rigid surface provides structural strength and support for the gripper, ensuring the reliability of the clamping force transmission. The flexible surface directly contacts the outer periphery of the shoe last. When clamping, the flexible posts undergo elastic deformation, which disperses the clamping force to a larger contact area, reduces the pressure per unit area, and avoids damaging the surface of the shoe last. The rigid and flexible surfaces enable the gripper to have both clamping force and surface protection functions, adapting to different shapes of shoe toes and heels.
[0019] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the second clamping mechanism includes a second movable cylinder disposed on both sides of the fixed platform at the arch of the shoe last, the driving end of the second movable cylinder is provided with a guide block, the guide block is provided with a first guide groove, a first wedge block is slidably disposed in the first guide groove, the guide block is provided with a second guide groove perpendicular to the first guide groove, the second guide groove extends toward the placement groove direction, a second wedge block is slidably disposed in the second guide groove, the first wedge block and the second wedge block abut against each other, the end of the second wedge block is provided with a flexible clamping plate through a pressure structure, and a flexible block is fixedly installed on the side of the flexible clamping plate facing the shoe last.
[0020] Using the above technical solution, the second clamping mechanism is set on both sides of the arch of the shoe last. The second moving cylinder pushes the guide block to move. Through the wedge-shaped contact between the first wedge block and the second wedge block, the linear output of the cylinder is converted into the lateral displacement of the second wedge block in the second guide groove, which drives the flexible clamping plate to clamp towards the arch of the shoe last. The wedge mechanism itself has a self-locking characteristic. After clamping, the second wedge block will not automatically disengage without external force, ensuring continuous clamping at the arch. The flexible clamping plate has a flexible block at the end, which further adapts to the curved shape of the arch on both sides. It can effectively fit and clamp the arch grooves of different widths and depths. At the same time, because the end uses a flexible block, the setting of a pressure structure avoids insufficient clamping force caused by the flexible block clamping.
[0021] The aforementioned adaptive shoe last surface processing equipment can be further configured as follows: the pressure structure includes a mounting block disposed on one side of the guide block, push plates are hinged on both sides of the mounting block, the end of the second wedge block abuts against the push plate, the second wedge block can push the push plate up when it moves axially, the mounting block is provided with a third guide groove, the third guide groove is provided with a top rod, a second return spring is provided between the top rod and the push plate, and the flexible clamp is fixedly connected to the end of the top rod away from the second return spring.
[0022] Using the above technical solution, when the second wedge block moves axially, its end pushes the push plate upward. The push plate rotates around the hinge point and drives the top rod to move upward in the third guide groove, converting the linear displacement of the second wedge block into the vertical output of the top rod, which drives the flexible clamping plate to further press against the arch of the shoe last. The second return spring stores energy when the push plate is lifted and provides a rebound force when released to reset the push plate and the top rod, ensuring that the flexible clamping plate can automatically retract and release the shoe last after the external force is removed. The guide groove constrains the movement direction of the top rod, preventing the top rod from deviating or jamming, and improving the reliability of the action. This pressurization structure realizes two-stage displacement amplification, so that the small stroke output of the cylinder can obtain a larger clamping and pressing amount.
[0023] The aforementioned adaptive shoe last surface processing equipment can be further configured such that: the surface processing device includes a processing table disposed on one side of the indexing turntable, the processing table is provided with a vertical lifting platform on the side facing the indexing turntable, and the vertical lifting platform is provided with a processing mounting head at the upper end of the indexing turntable.
[0024] By adopting the above technical solution, a vertical lifting platform is set on the processing table, which enables the processing and installation head to automatically adjust its vertical position according to different shoe last heights, thus enabling the processing of different shoe lasts.
[0025] The beneficial effects of the present invention are as follows: Through the adaptive clamping of the bottom adaptive structure, the first clamping mechanism and the second clamping mechanism, there is no need for tedious manual adjustments for different shoe lasts. The entire clamping system can automatically adapt to the shape differences of different shoe lasts, greatly reducing the amount of manual operation for shape change and adjustment, improving production efficiency, and achieving stable clamping of various shoe lasts. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the indexing turntable structure of the present invention; Figure 3 This is a structural diagram of the shoe last fixing device of the present invention; Figure 4 This is a schematic diagram of the bottom adaptive structure of the present invention; Figure 5 This is a structural diagram of the first clamping mechanism of the present invention; Figure 6 This is an enlarged view of the structure at point A of the present invention; Figure 7 This is a cross-sectional view of the second clamping mechanism of the present invention; Label annotations: 1-Surface processing device, 2-Shoe last fixing device, 3-Indexing turntable, 4-Shoe last fixing seat, 5-Fixing platform, 6-Bottom adaptive structure, 7-First clamping mechanism, 8-Second clamping mechanism, 9-Air chamber, 10-Airbag, 11-Floating plate, 12-Placement cavity, 13-Elastic membrane, 14-Guide mounting post, 15-Ball head guide rod, 16-Fixed bushing, 17-Moving plate, 18-Moving post, 19-Elastic element, 20-Limiting end, 21-First moving cylinder, 22-Guide plate, 23-Gripper mounting plate, 24-Telescopic motor, 25-Gripper connecting plate, 26-First connecting arm, 27-Second connecting arm, 28-Elastic ball head, 2 9-Flexible gripper, 30-Motor body, 31-Telescopic lead screw, 32-Coil mounting shaft, 33-Coil, 34-Locking disc, 35-Moving disc, 36-Fixed disc, 37-First return spring, 38-Flexible surface, 39-Rigid surface, 40-Flexible pile, 41-Second moving cylinder, 42-Guide block, 43-First guide groove, 44-First wedge block, 45-Second guide groove, 46-Second wedge block, 47-Flexible clamping plate, 48-Flexible block, 49-Mounting block, 50-Push plate, 51-Third guide groove, 52-Top rod, 53-Second return spring, 54-Processing table, 55-Vertical lifting table, 56-Processing and mounting head, 57-Inflation hole. Detailed Implementation
[0027] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.
[0028] An adaptive shoe last surface processing device according to this embodiment includes a surface processing device 1 and a shoe last fixing device 2. The shoe last fixing device 2 includes an indexing turntable 3 disposed on one side of the surface processing device 1, and a plurality of shoe last fixing seats 4 are distributed on the indexing turntable 3. The shoe last fixing seat 4 includes a fixing platform 5 fixedly installed on the indexing turntable 3. The bottom of the fixing platform 5 is provided with a bottom adaptive structure 6. The fixing platform 5 is provided with a first clamping mechanism 7 at the toe and heel of the shoe last, and a second clamping mechanism 8 on both sides of the fixing platform 5 at the arch of the shoe last.
[0029] Bottom Adaptive Structure 6 As shown in the figure, the bottom adaptive structure 6 includes: an air chamber 9 located at the bottom of the shoe last fixing seat 4 within the indexing turntable 3; an air bladder 10 located within the air chamber 9; a floating plate 11 located on top of the air bladder 10; a placement cavity 12 for placing the shoe last on the fixing platform 5; a plurality of elastic ball head 28 assemblies located at the bottom of the placement cavity 12; an elastic membrane 13 located on the surface of the placement cavity 12; and the elastic ball head 28 assemblies placed within the shoe last. When shoe lasts of different shapes are placed into the placement cavity 12, the bottom of the shoe last presses against the elastic membrane 13. The elastic ball head assembly is compressed under the pressure of the bottom of the shoe last, pushing the floating plate 11 downward and compressing the air bladder 10. The gas in the air bladder 10 is compressed and generates a reaction force, which is transmitted to each elastic ball head assembly 28 through the floating plate 11. This ensures that each elastic ball head assembly 28 always maintains a tight fit against the protruding areas (such as the arch and metatarsal ball) of the bottom of the shoe last, thereby achieving full contact adaptive fit between the bottom of the shoe last and the fixing seat, effectively addressing individual differences such as the curvature and grooves of the bottom surface of different shoe lasts.
[0030] The elastic ball head assembly includes: a guide mounting post 14, one end of which is fixedly mounted to a floating plate 11; an elastic ball head 28, with a ball head guide rod 15 at the bottom of the elastic ball head 28, a fixed bushing 16 on the side of the ball head guide rod 15 facing the elastic ball head 28, and a movable plate 17 on the outer periphery of the fixed bushing 16; a plurality of movable posts 18 are provided on the guide mounting post 14, and the movable plate 17 is sleeved on the movable posts 18, with the movable posts 18 providing a limit to the movable plate 17 at the end facing the elastic ball head 28; an elastic element 19 is provided between the movable plate 17 and the guide mounting post 14, with one end of the elastic element 19 abutting against the movable plate 17 and the other end abutting against one side of the guide mounting post 14; and the elastic ball head 28 is placed on the surface of the placement cavity 12.
[0031] As shown in the figure, when different height areas of the bottom of the shoe last press against the elastic ball head 28, the ball head guide rod 15 moves downward against the elastic force of the elastic element 19. Each elastic ball head 28 is independently adjusted to make full contact with the bottom of the shoe last, achieving elastic support for protruding areas such as the arch and metatarsal ball, as well as the bottom of the groove. The moving column 18 has an upper limit function on the moving plate 17, preventing the elastic element 19 from being over-compressed, ensuring that the elastic ball head 28 works within a reasonable stroke range, and improving the clamping self-adaptive accuracy and structural reliability.
[0032] First clamping mechanism As shown in the figure, the first clamping mechanism 7 includes: a first movable cylinder 21 disposed on the fixed platform 5 at the toe and heel of the shoe last; a guide plate 22 is provided at the end of the first movable cylinder 21; a gripper mounting plate 23 is provided on the guide plate 22; one side of the gripper mounting plate 23 is fixedly connected to the first movable cylinder 21, and the other end is provided with a telescopic motor 24; the telescopic motor 24 is provided with a locking structure; a gripper connecting plate 25 is provided at the end of the telescopic motor 24; first connecting arms 26 are hinged to both sides of the gripper mounting plate 23; a second connecting arm 27 is hinged to the end of the first connecting arm 26 away from the gripper mounting plate 23; the gripper connecting plate 25 is disposed between the second connecting arms 27; the output end of the telescopic motor 24 passes through the gripper mounting plate 23 and is connected to the gripper connecting plate 25; a flexible gripper 29 is provided on the side of the second connecting arm 27 facing the placement groove.
[0033] When the first clamping mechanism 7 is working, the first moving cylinder 21 drives the guide plate 22 to move, which in turn drives the gripper mounting plate 23 to extend and retract the entire gripper mechanism, adjusting the distance between the gripper and the shoe last. The output end of the telescopic motor 24 passes through the gripper mounting plate 23 and connects to the gripper connecting plate 25. Through two sets of hinged first connecting arms 26 and second connecting arms 27, a four-bar linkage is formed, which converts the linear output of the telescopic motor 24 into the opening and closing motion of the flexible gripper 29, thereby achieving the clamping of the shoe last, toe, and heel. After clamping, the locking structure of the telescopic motor 24 automatically locks the output shaft to prevent the gripper from retracting due to inertia or external force under processing vibration, achieving self-locking clamping and avoiding clamping position deviation and wear of the drive mechanism.
[0034] Locking structure of telescopic motor 24 The telescopic motor 24 includes a motor body 30 and a telescopic lead screw 31. The end of the telescopic lead screw 31 is fixedly connected to the drive plate. A coil 33 mounting shaft 32 is provided at the end of the telescopic lead screw 31 facing the motor body 30, and a coil 33 is provided inside the coil 33 mounting shaft 32. A locking disc 34 is sleeved on one side of the telescopic lead screw 31 located on the coil 33 mounting shaft 32. A movable disc 35 and a fixed disc 36 are respectively provided on both sides of the locking disc 34 located on the coil 33 mounting shaft 32. The locking disc 34 is located between the movable disc 35 and the fixed disc 36. The movable disc 35 can reciprocate along the telescopic lead screw 31. A first return spring 37 is provided between the coil 33 mounting shaft 32 and the movable disc 35.
[0035] The locking structure operates as follows: In normal (power-off) condition, the first return spring 37 pushes the moving disk 35 to lock the locking disk 34 in the locked position. The telescopic screw 31 is locked by friction between the disk surface and the locking mechanism, maintaining the locked state without continuous power. When unlocking is required, the coil 33 is energized to generate electromagnetic force, driving the moving disk 35 to move axially, disengaging the locking disk 34 from the locked position, and restoring the telescopic screw 31 to free movement. After power is cut off, the first return spring 37 automatically pushes the moving disk 35 back to its original position, and the locking disk 34 returns to the locked position. This electromagnetic locking method has a longer service life than a purely mechanical snap-fit structure and does not require continuous motor power to maintain the clamping state, saving energy.
[0036] Flexible gripper 29 structure The flexible gripper 29 includes a flexible surface 38 that contacts the outer periphery of the shoe last and a rigid surface 39 that is away from the outer periphery of the shoe last. The flexible surface 38 and the rigid surface 39 are connected by a plurality of flexible piles 40.
[0037] The rigid surface 39 provides structural strength and support for the grippers, ensuring reliable transmission of clamping force. The flexible surface 38 directly contacts the outer periphery of the shoe last, and the flexible post 40 undergoes elastic deformation during clamping, distributing the clamping force over a larger contact area, reducing pressure per unit area, and preventing damage to the shoe last surface. The combination of the rigid surface 39 and the flexible surface 38 gives the grippers both clamping strength and surface protection, enabling them to adapt to different toe and heel shapes.
[0038] Second clamping mechanism 8 When the second clamping mechanism 8 is working, the second moving cylinder 41 pushes the guide block 42 to move, causing the first wedge block 44 to slide in the first guide groove 43. The first wedge block 44 and the second wedge block 46 abut against each other, and the linear output of the cylinder is converted into the lateral displacement of the second wedge block 46 in the second guide groove 45 through the wedge surface, which drives the flexible clamping plate 47 to clamp towards the arch of the shoe last. The wedge mechanism itself has a self-locking characteristic. After clamping, the second wedge block 46 will not automatically disengage without external force, ensuring continuous clamping at the arch. The flexible block 48 at the end of the flexible clamping plate 47 can further adapt to the curved shape of the two sides of the arch, and can effectively fit and clamp the arch grooves of different widths and depths. At the same time, a pressure structure is set at the end to effectively compensate for the clamping force loss caused by the deformation of the flexible block 48, ensuring sufficient clamping force.
[0039] The pressurizing structure includes: a mounting block 49 disposed on one side of the guide block 42; push plates 50 are hinged on both sides of the mounting block 49; the end of the second wedge block 46 abuts against the push plate 50; when the second wedge block 46 moves axially, it can push the push plate 50 upward; a third guide groove 51 is provided in the mounting block 49; a push rod 52 is provided in the third guide groove 51; a second return spring 53 is provided between the push rod 52 and the push plate 50; and a flexible clamping plate 47 is fixedly connected to the end of the push rod 52 away from the second return spring 53.
[0040] The working process of the pressurizing structure is as follows: When the second wedge block 46 moves axially, its end pushes the push plate 50 to rotate upward around the hinge point. The push plate 50 drives the top rod 52 to move upward in the third guide groove 51, converting the linear displacement of the second wedge block 46 into the vertical output of the top rod 52. This drives the flexible clamping plate 47 to further pressurize the arch of the shoe last, achieving two-stage displacement amplification, so that the small stroke output of the cylinder can obtain a larger clamping and pressing amount. The second return spring 53 stores energy when the push plate 50 is lifted. After the external force is removed, it provides a rebound force to make the push plate 50 and the top rod 52 automatically reset, ensuring that the flexible clamping plate 47 can automatically retract and release the shoe last. The third guide groove 51 constrains the movement direction of the top rod 52, preventing the top rod 52 from deviating or jamming, and improving the reliability of the operation.
[0041] Overall Operation Instructions As shown in the figure, the complete workflow of the adaptive shoe last surface processing equipment of the present invention is as follows: (1) Place the shoe last: Place the shoe last to be processed into the placement cavity 12 of the fixed platform 5. The bottom of the shoe last is pressed against the elastic membrane 13. Each elastic ball head 28 component adapts to the reaction force of the air bag 10 to achieve full fit with the bottom of the shoe last.
[0042] (2) After the bottom adaptive bonding is completed, the first clamping mechanism 7 is started. The first moving cylinder 21 drives the gripper to approach the shoe last, shoe toe and shoe heel. The telescopic motor 24 drives the four-bar mechanism to close the flexible gripper 29 and clamp it. The locking structure automatically locks.
[0043] (3) Start the second clamping mechanism 8, the second moving cylinder 41 pushes the wedge mechanism, which drives the flexible clamping plate 47 and the pressure structure to fit and clamp to both sides of the foot arch, and the wedge self-locking mechanism maintains continuous clamping force.
[0044] (4) Start the surface processing device 1, and the indexing turntable 3 rotates according to the setting. The surface processing device 1 processes the shoe lasts at each station in sequence. During the processing, the bottom adaptive structure 6, the first clamping mechanism 7 and the second clamping mechanism 8 work together to ensure that the shoe last is stable and does not shift.
[0045] (5) After processing, each clamping mechanism is unlocked and retracted in sequence. The airbag 10 elastically assists in lifting the shoe last, and the operator takes out the shoe last to complete one processing cycle.
[0046] The present invention utilizes the adaptive clamping of the bottom adaptive structure 6, the first clamping mechanism 7, and the second clamping mechanism 8 to eliminate the need for tedious manual adjustments for different shoe lasts. The entire clamping system can automatically adapt to the shape differences of different shoe lasts, significantly reducing the amount of manual operation required for shape change and adjustment, improving production efficiency, and achieving stable clamping of various shoe lasts.
Claims
1. An adaptive shoe last surface processing device, comprising a surface processing unit and a shoe last fixing unit, wherein the shoe last fixing unit includes an indexing turntable disposed on one side of the surface processing unit, and a plurality of shoe last fixing seats are distributed on the indexing turntable, characterized in that: The shoe last fixing base includes a fixing platform fixedly installed on the indexing turntable. The bottom of the fixing platform is provided with a bottom adaptive structure that can adapt to the shape of the bottom of the shoe last and fit the bottom of the shoe last. The fixing platform is provided with a first clamping mechanism that can be self-locking after being clamped at the toe and heel of the shoe last, and a second clamping mechanism that can adapt to different sides of the shoe last.
2. The adaptive shoe last surface processing equipment according to claim 1, characterized in that: The bottom adaptive structure includes an air chamber located at the bottom of the shoe last fixing seat within the indexing turntable. The air chamber is equipped with an air bladder, and a floating plate is provided on the top of the air bladder. The fixing platform is equipped with a placement cavity for placing the shoe last. The bottom of the placement cavity is equipped with several elastic ball head assemblies, and an elastic membrane is provided on the surface of the placement cavity. The elastic ball head assemblies are placed inside the elastic membrane, and the end of the elastic ball head assembly away from the elastic membrane is fixedly connected to the floating plate.
3. The adaptive shoe last surface processing equipment according to claim 2, characterized in that: The elastic ball head assembly includes a guide mounting post fixedly installed at one end to a floating plate and an elastic ball head. The bottom of the elastic ball head is provided with a ball head guide rod. A fixed bushing is provided on the side of the ball head guide rod facing the elastic ball head. A movable plate is provided on the outer periphery of the fixed bushing. The guide mounting post is provided with a plurality of movable posts. The movable plate is sleeved on the movable posts. The movable post facing the elastic ball head has a limiting effect on the movable plate. An elastic element is provided between the movable plate and the guide movable post. One end of the elastic element abuts against the movable plate and the other end abuts against one side of the guide movable post. The elastic ball head is placed on the surface of the placement groove.
4. The adaptive shoe last surface processing equipment according to claim 3, characterized in that: The movable column is provided with a limiting end, which is the upper limit of the movable plate, and the guide movable column is the lower limit of the movable plate.
5. The adaptive shoe last surface processing equipment according to claim 1, characterized in that: The first clamping mechanism includes a first movable cylinder disposed on a fixed platform at the toe and heel of the shoe last. The first movable cylinder has a guide plate at its end, and the guide plate has a gripper mounting plate. One side of the gripper mounting plate is fixedly connected to the first movable cylinder, and the other end has a telescopic motor. The telescopic motor has a locking structure, and the end of the telescopic motor has a gripper connecting plate. The gripper mounting plate has first connecting arms hinged on both sides, and a second connecting arm hinged at the end of the first connecting arm away from the gripper mounting plate. The gripper connecting plate is disposed between the second connecting arms. The output end of the telescopic motor passes through the gripper mounting plate and connects to the gripper connecting plate. The second connecting arm has a flexible gripper on the side facing the placement groove.
6. The adaptive shoe last surface processing equipment according to claim 5, characterized in that: The telescopic motor includes a motor body and a telescopic lead screw. The end of the telescopic lead screw is fixedly connected to a drive plate. A coil mounting shaft is provided at the end of the telescopic lead screw facing the motor body. A coil is provided inside the coil mounting shaft. A locking disc is sleeved on one side of the telescopic lead screw located on the coil mounting shaft. A movable disc and a fixed disc are respectively provided on both sides of the locking disc on the coil mounting shaft. The locking disc is located between the movable disc and the fixed disc. The movable disc can reciprocate along the lead screw. A first return spring is provided between the coil mounting shaft and the movable disc.
7. The adaptive shoe last surface processing equipment according to claim 6, characterized in that: The flexible gripper includes a flexible surface that contacts the outer periphery of the shoe last and a rigid surface that is away from the outer periphery of the shoe last. The flexible surface and the rigid surface are connected by a number of flexible posts.
8. The adaptive shoe last surface processing equipment according to claim 1, characterized in that: The second clamping mechanism includes a second movable cylinder disposed on both sides of the fixed platform at the arch of the shoe last. The driving end of the second movable cylinder is provided with a guide block. A first guide groove is formed in the guide block. A first wedge block is slidably disposed in the first guide groove. A second guide groove is provided perpendicular to the first guide groove of the guide block. The second guide groove extends toward the placement groove. A second wedge block is slidably disposed in the second guide groove. The first wedge block and the second wedge block abut against each other. A flexible clamping plate is provided at the end of the second wedge block through a pressure structure. A flexible block is fixedly installed on the side of the flexible clamping plate facing the shoe last.
9. The adaptive shoe last surface processing equipment according to claim 8, characterized in that: The pressurizing structure includes a mounting block disposed on one side of the guide block, push plates are hinged on both sides of the mounting block, the end of the second wedge block abuts against the push plate, and the second wedge block can push the push plate up when it moves axially. The mounting block is provided with a third guide groove, and a top rod is provided in the third guide groove. A second return spring is provided between the top rod and the push plate, and the flexible clamp is fixedly connected to the end of the top rod away from the second return spring.
10. The adaptive shoe last surface processing equipment according to claim 1, characterized in that: The surface processing device includes a processing table disposed on one side of the indexing turntable, a vertical lifting platform disposed on the side of the processing table facing the indexing turntable, and a processing mounting head disposed on the upper end of the vertical lifting platform at the indexing turntable.