Special clamping tool for shoe tree processing

Abstract

The utility model provides a special clamping tool for shoe tree processing. The special clamping tool comprises a rack, a shoe tree fixed guide plate, a shoe tree movable guide plate, a centering positioning device and an overturning positioning device. The shoe tree fixed guide plate is fixed on the machine frame, and the shoe tree movable guide plate can move in a reciprocating mode through a linear motion mechanism. The shoe tree is inserted into the left longitudinal center positioning groove and the right longitudinal center positioning groove through the guiding positioning blocks to achieve guiding, the centering positioning device drives the centering block to clamp the upper portion of the shoe tree through the lead screw and the nut sleeve, and the overturning positioning device presses the shoe tree through the hydraulic motor and the clamping body. The tool further comprises a shoe last limiting block and a shoe last limiting block, and it is ensured that the shoe last is stably positioned. The linear motion mechanism is driven by an air cylinder and adapts to shoe trees of different specifications. The tool ensures that the shoe tree is horizontal and correct in direction, machining displacement is prevented, and the precision of positioning holes is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a special clamping tool for shoe tree processing. BACKGROUND

[0002] A shoe tree is a model used for making shoes, and through the shoe tree, the shape and structure of the shoes can be maintained during the shoe-making process, ensuring that the shoes maintain the correct shape during the production process and provide comfortable fit in the final form.

[0003] As disclosed in the Chinese utility model patent document with the publication number "CN207444402U", a through-hole structure injection shoe tree is disclosed, which is provided with two groups of positioning holes 2 on the shoe tree body. Figures 2 to 5 The positions of the positioning holes 2 can be clearly seen. These two groups of positioning holes are structures that must be processed during the manufacturing of the shoe tree, and the function of the positioning holes is to enable the mechanical arm to be fixed with the shoe tree body, achieving automated operation of the shoe tree body movement. This is not only to facilitate the processing of the shoe tree, but also to use the positioning holes during the later production of the shoe tree.

[0004] When processing the positioning holes of the shoe tree, it is crucial to ensure that the upper end of the shoe tree is exposed and kept horizontal, because any inclination will directly affect the position and direction of the positioning holes. In addition, in order to accurately process the two groups of positioning holes, the shoe tree not only needs to be horizontal at the upper end, but also needs to be in the correct direction, so that the reference positioning can be performed. However, during the processing, how to stably fix the shoe tree to prevent the impact force generated by the cutter from affecting the accuracy of the positioning holes is also a technical difficulty that needs to be solved.

[0005] Therefore, when designing a clamping tool specifically for shoe tree processing, how to ensure that the upper end of the shoe tree is kept horizontal and in the correct direction becomes a key problem that needs to be solved urgently. CONTENT OF THE UTILITY MODEL

[0006] The utility model solves the technical problem of the prior art by providing a special clamping tool for shoe tree processing, which can ensure that the upper end of the shoe tree is kept horizontal, guarantee that the shoe tree is placed in the correct direction, stably fix the shoe tree, effectively prevent the displacement of the shoe tree during processing, and ensure the accuracy of the positioning holes. It can also adapt to different specifications and types of shoe trees.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0008] The clamping tool special for shoe tree processing comprises a rack, characterized in that: the rack is provided with oppositely distributed shoe tree fixed guide plates and shoe tree movable guide plates below the rack, the shoe tree fixed guide plates are fixed on the rack, the shoe tree fixed guide plates are provided with left longitudinal central positioning grooves on the side towards the shoe tree movable guide plates, the left longitudinal central positioning grooves are open at the end towards the shoe tree movable guide plates, the shoe tree movable guide plates are provided with right longitudinal central positioning grooves on the side towards the shoe tree fixed guide plates, the right longitudinal central positioning grooves are open at the end towards the shoe tree fixed guide plates, the shoe tree movable guide plates are linked with linear motion mechanisms, the linear motion mechanisms can drive the shoe tree movable guide plates to reciprocate towards the shoe tree fixed guide plates, the shoe tree fixed guide plates are linked with centering positioning devices capable of clamping the upper part of the shoe tree, and the shoe tree movable guide plates are linked with turnover positioning devices capable of pressing the shoe tree.

[0009] It should be noted that the foot stepping surface of the shoe tree is provided with two groups of guide positioning blocks, one group of guide positioning blocks is located near the toe part, and the other group of guide positioning blocks is located at the heel, and the two sides of each group of guide positioning blocks are respectively provided with symmetrical positioning reference planes which are parallel to the upper end surface of the shoe tree, and the purpose is to guide the upper end surface of the shoe tree. The linear motion mechanisms drive the shoe tree movable guide plates to move to an initial position, so that the distance between the shoe tree fixed guide plates and the shoe tree movable guide plates is large enough to accommodate the insertion of a shoe tree. The foot stepping surface of the shoe tree is directed towards the two shoe tree guide plates, and the two groups of guide positioning blocks are respectively inserted into the left longitudinal central positioning groove and the right longitudinal central positioning groove, so as to ensure that the placement direction of the shoe tree is correct and unique. Further, the positioning reference planes on both sides of each group of guide positioning blocks on the shoe tree are respectively in contact with the planes of the shoe tree fixed guide plates and the shoe tree movable guide plates, so as to realize the positioning of the upper end surface of the shoe tree and ensure that it is located on the horizontal plane, which can accurately perform reference positioning and promote the accurate positioning of the positioning holes. The centering positioning device clamps the upper part of the shoe tree and centers the upper part of the shoe tree. Once the shoe tree is correctly guided and positioned, the linear motion mechanisms are started to drive the shoe tree movable guide plates to move to the left until the shoe tree movable guide plates reach the predetermined position. Then the turnover positioning device presses the shoe tree, at this time, the position and direction of the shoe tree are firmly locked. Further, the linear motion mechanisms drive the shoe tree movable guide plates to move, which can adapt to shoe trees of different specifications and types, and expand the adaptation range of the shoe tree plane guide positioning mechanism. In summary, the clamping tool special for shoe tree processing can ensure that the upper end of the shoe tree remains horizontal, ensure that the direction of the shoe tree is placed correctly, stably fix the shoe tree, effectively prevent the displacement of the shoe tree during processing, ensure the accuracy of the positioning hole, and also adapt to shoe trees of different specifications and types.

[0010] The special clamping tool for shoe tree processing can be further provided with: the centering positioning device comprises a centering frame and a lead screw rotatably mounted on the centering frame through bearings at both ends, the centering frame is detachably mounted on the shoe tree fixing guide plate through screws, the lead screw is sequentially provided with a right-handed screw rod segment and a left-handed screw rod segment along the axial direction of the lead screw, the right-handed screw rod segment and the left-handed screw rod segment are symmetrically arranged, the right-handed screw rod segment is threadedly connected with a right-handed nut sleeve, the left-handed screw rod segment is threadedly connected with a left-handed nut sleeve, the right-handed nut sleeve is connected with a right-handed centering block, the left-handed nut sleeve is connected with a left-handed centering block, and the lead screw is connected with a rotating driving mechanism capable of driving the lead screw to rotate, when the rotating driving mechanism drives the lead screw to rotate, the right-handed centering block and the left-handed centering block can approach or separate from each other.

[0011] The rotating driving mechanism is started to drive the lead screw to rotate, and with the rotation of the lead screw, the right-handed nut sleeve and the left-handed nut sleeve move on the right-handed screw rod segment and the left-handed screw rod segment respectively. Because the thread directions are opposite (the right-handed screw rod segment and the left-handed screw rod segment are symmetrically arranged), the two nut sleeves will move in opposite directions, and the right-handed nut sleeve and the left-handed nut sleeve are connected with the right-handed centering block and the left-handed centering block respectively. Therefore, when the nut sleeves move, the centering blocks will also move. When the lead screw rotates to make the two nut sleeves move towards each other, the two centering blocks will also approach each other, until the upper end of the shoe tree is clamped and positioned in the middle of the shoe tree fixing guide plate. Conversely, when the lead screw rotates to make the two nut sleeves move away from each other, the two centering blocks will separate from each other to release the shoe tree. Through the centering positioning device designed in the application, the upper end of the shoe tree is exposed, which can facilitate the positioning hole processing, and the structure is simple, the whole mechanism has low cost, and fast centering and clamping can be realized.

[0012] The special clamping tool for shoe tree processing can be further provided with: the lead screw is provided below with a heel limiting block, and the heel limiting block is detachably connected with the shoe tree fixing guide plate through screws.

[0013] The heel limiting block positions the heel part of the shoe tree, thereby preliminarily positioning the shoe tree in the correct position. The heel limiting block cooperates with the two groups of centering guide positioning blocks to realize multi-directional positioning of the shoe tree. The heel limiting block is detachably connected with the centering frame through screws, so that the heel limiting block can be quickly disassembled to adapt to shoe trees of different specifications and types.

[0014] The special clamping tool for shoe tree processing can be further provided with: the rotating driving mechanism comprises a centering driving driven sprocket connected with the end of the lead screw, the centering driving driven sprocket is connected with a centering driving driving sprocket through a chain, the centering driving driving sprocket is connected with a centering hydraulic motor, and the body of the centering hydraulic motor is mounted on the centering frame.

[0015] When the centering positioning device works, the centering hydraulic motor drives the centering driving driving sprocket to rotate, the centering driving driving sprocket drives the centering driving driven sprocket through the chain, when the centering driving driving sprocket rotates, the chain drives the centering driving driven sprocket to rotate synchronously, thereby driving the screw rod to rotate, the two groups of centering blocks are close to each other, and the upper part of the shoe tree is clamped and centered.

[0016] The shoe tree processing special clamping tool can be further provided with a first linkage block sleeved on the periphery of the toothed nut sleeve, a first sliding block is detachably connected to one side of the first linkage block through a screw, the first sliding block is slidably connected with a first sliding rail, the first sliding rail is fixed on the centering frame and is parallel to the screw rod, and the other side of the first linkage block is detachably connected with the toothed centering block through a screw.

[0017] The linkage block is an intermediate component connecting the nut sleeve and the sliding block, and can convert the movement of the nut sleeve into the movement of the sliding block. Meanwhile, the linkage block is detachably connected with the centering block through a screw, which facilitates the installation and dismounting of the centering block. The first sliding rail, the first sliding block and the second sliding block can reduce the stress on the screw rod and improve the movement stability of the two groups of centering blocks.

[0018] The shoe tree processing special clamping tool can be further provided with a first linkage block sleeved on the periphery of the toothed nut sleeve, a first sliding block is detachably connected to one side of the first linkage block through a screw, the first sliding block is slidably connected with a first sliding rail, the first sliding rail is fixed on the centering frame and is parallel to the screw rod, and the other side of the first linkage block is detachably connected with the toothed centering block through a screw.

[0019] When the turnover positioning device moves towards the shoe tree along with the shoe tree movable guide plate until close to the shoe tree, the turnover hydraulic motor drives the second driving sprocket to rotate, the chain drives the second driven sprocket to rotate synchronously, thereby driving the rotating shaft to rotate, and one end of the clamping body will rotate accordingly until the other end of the clamping body is turned over to the shoe tree, thereby clamping the two sides of the shoe tree and fixing the shoe tree. The clamping body directly acts on the shoe tree to realize positioning or releasing, which greatly saves space compared with the traditional linear movement mode. Further, the turnover hydraulic motor not only has high response speed, but also can change the turnover angle of the clamping body according to actual needs to adapt to shoe trees of different specifications.

[0020] The special clamping tool for shoe tree processing can be further provided with a last limiting block below the clamping body, and the two sides of the last limiting block are detachably connected to the two sides of the shoe tree movable guide plate through screws.

[0021] The last limiting block positions the front end of the shoe tree, thereby preliminarily positioning the shoe tree at a correct position. While the clamping body clamps the shoe tree, the last limiting block continues to play a supporting and limiting role, ensuring that the shoe tree does not shake or deviate during positioning, thereby greatly improving the stability and accuracy of shoe tree positioning. Further, the two sides of the last limiting block are detachably connected to the two sides of the shoe tree movable guide plate through screws, facilitating replacement of the last limiting block to adapt to the positioning needs of different shoe trees.

[0022] The special clamping tool for shoe tree processing can be further provided with a U-shaped groove at the other end of the clamping body, the U-shaped groove is open at the end away from the rotating shaft, and the other end of the U-shaped groove is provided with symmetrically distributed V-shaped edges, and the clamping body at the open end of the U-shaped groove is provided with an arc-shaped chamfer.

[0023] The U-shaped groove is used to accommodate and position the shoe tree, and the open end of the U-shaped groove is provided to facilitate the clamping body to conveniently enter or exit the shoe tree. The V-shaped edges facilitate adaptation to the arc shape of the front side of the shoe tree. The arc-shaped chamfer avoids scratching the hands of the operator, thereby protecting the operator.

[0024] The special clamping tool for shoe tree processing can be further provided with a left longitudinal center positioning groove and a right longitudinal center positioning groove, which are parallel to each other and located on the same straight line track; the upper end surface of the shoe tree fixed guide plate is a left positioning reference plane, the upper end surface of the shoe tree movable guide plate is a right positioning reference plane, and the left positioning reference plane and the right positioning reference plane are parallel to each other and located on the same horizontal plane.

[0025] The left longitudinal center positioning groove and the right longitudinal center positioning groove are parallel to each other and located on the same straight line track, which ensures that the shoe tree can move along a stable and straight path during insertion, thereby avoiding deviation or inclination of the shoe tree during insertion, and improving the accuracy of guidance and positioning. Further, the left positioning reference plane and the right positioning reference plane are located on the same horizontal plane and parallel to each other, which ensures that the upper end surface of the shoe tree (mainly because the two positioning reference planes on the sides of the guide positioning block are parallel to the upper end surface of the shoe tree) is accurately positioned in the horizontal direction, thereby avoiding positioning errors caused by the difference in height between the two guide plates, and further improving the positioning accuracy of the shoe tree.

[0026] The special clamping tool for shoe tree processing can be further provided with a linear motion mechanism, which comprises a lifting block fixed to the lower side of the shoe tree movable guide plate through a screw, the lifting block is connected with a third sliding block, the third sliding block is slidingly matched with a second sliding rail, the second sliding rail is fixed to the rack and is parallel to the right longitudinal center positioning groove, a transmission block is fixed to the lower side of the shoe tree movable guide plate, the transmission block is connected with a gas cylinder, the body of the gas cylinder is fixed to the rack, and the gas cylinder can drive the shoe tree movable guide plate to reciprocate along the axis of the second sliding rail through the transmission block.

[0027] When the shoe tree is inserted into the shoe tree fixed guide plate and the shoe tree movable guide plate through the two groups of guide positioning blocks respectively, the gas cylinder drives the shoe tree movable guide plate to move along the axis of the sliding rail through the transmission block. Since the sliding rail is parallel to the right longitudinal center positioning groove, the shoe tree movable guide plate keeps a stable direction during the movement, until the centering positioning device and the turnover positioning device clamp the shoe tree, so that subsequent processing operation is facilitated. After the processing is completed, the centering positioning device and the turnover positioning device are withdrawn, the gas cylinder drives the shoe tree movable guide plate to move reversely along the sliding rail, and the shoe tree is released.

[0028] The utility model will be explained in further detail below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the whole structure schematic diagram of the utility model embodiment;

[0030] Figure 2 It is the turnover positioning device schematic diagram of the utility model embodiment;

[0031] Figure 3 It is the shoe tree and turnover positioning device linkage schematic diagram of the utility model embodiment;

[0032] Figure 4 It is the explosion schematic diagram of the turnover positioning device and linear motion mechanism of the utility model embodiment;

[0033] Figure 5 It is the shoe tree schematic diagram of the utility model embodiment;

[0034] Figure 6 It is the explosion schematic diagram of the centering positioning device of the utility model embodiment;

[0035] Figure 7 It is the shoe tree and centering positioning device linkage schematic diagram of the utility model embodiment;

[0036] Figure 8 It is the shoe tree fixed guide plate and shoe tree movable guide plate schematic diagram of the utility model embodiment;

[0037] Figure 9The shoe tree mounting and clamping schematic view of the embodiment of the utility model.

[0038] Label comment: shoe tree a, guide positioning block a1, positioning reference plane a2;Shoe tree fixed guide plate h, left longitudinal center positioning groove h1, left positioning reference plane h2;Shoe tree movable guide plate b, right longitudinal center positioning groove b1, right positioning reference plane b2;Linear motion mechanism c, lifting block c1, third sliding block c2, second sliding rail c3, transmission block c4, air cylinder c5;Centering positioning device d, centering frame d1, right-handed screw rod segment d2, left-handed screw rod segment d3, right-handed nut sleeve d4, left-handed nut sleeve d5, right-handed centering block d6, left-handed centering block d7, centering drive driven sprocket d8, centering drive driving sprocket d9, centering hydraulic motor d10, first linkage block d11, first sliding block d12, first sliding rail d13, second linkage block d14, second sliding block d15;Turnover positioning device e, clamping body e1, support frame e2, pivot e3, second driven sprocket e4, arc chamfer e5, turnover hydraulic motor e6, U-shaped groove e7, V-shaped welt e8;Tree heel limiting block f, tree toe limiting block g. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0040] As Figures 1 to 9 The shoe tree a machining special mounting and clamping tool shown in the utility model, including frame, the frame lower part is provided with opposite distribution shoe tree fixed guide plate h, shoe tree movable guide plate b, shoe tree fixed guide plate h is fixed on the frame, shoe tree fixed guide plate h is located in the side towards shoe tree movable guide plate b is equipped with left longitudinal center positioning groove h1, left longitudinal center positioning groove h1 is located in the end towards shoe tree movable guide plate b is open, shoe tree movable guide plate b is located in the side towards shoe tree fixed guide plate h is equipped with right longitudinal center positioning groove b1, right longitudinal center positioning groove b1 is located in the end towards shoe tree fixed guide plate h is open, shoe tree movable guide plate b is linked with linear motion mechanism c, linear motion mechanism c can drive shoe tree movable guide plate b reciprocating movement towards shoe tree fixed guide plate h, shoe tree fixed guide plate h is linked with the centering positioning device d that can clamp shoe tree a upper part, shoe tree movable guide plate b is linked with the turnover positioning device e that can press tightly shoe tree a.

[0041] The left longitudinal center positioning groove h1 and the right longitudinal center positioning groove b1 are parallel to each other and are located on the same straight track, so that the shoe tree a can move along a stable and straight path during insertion, avoiding deviation or inclination of the shoe tree a during insertion, thereby improving the accuracy of guidance and positioning.

[0042] The upper end surface of the shoe tree fixed guide plate h is a left positioning reference plane h2, and the upper end surface of the shoe tree movable guide plate b is a right positioning reference plane b2. The left positioning reference plane h2 and the right positioning reference plane b2 are parallel to each other and are located on the same horizontal plane. The upper end surface of the shoe tree a is accurately positioned in the horizontal direction, avoiding positioning errors caused by the difference in height of the two guide plates, and further improving the positioning accuracy of the shoe tree a.

[0043] The linear motion mechanism c includes a lifting block c1 fixed to the lower side of the shoe tree movable guide plate b by a screw, the lifting block c1 is connected with a third sliding block c2, the third sliding block c2 is slidingly connected with a second sliding rail c3, the second sliding rail c3 is fixed to the rack and is parallel to the right longitudinal center positioning groove b1, a transmission block c4 is fixed below the shoe tree movable guide plate b, the transmission block c4 is connected with a gas cylinder c5, the body of the gas cylinder c5 is fixed to the rack, and the gas cylinder c5 can drive the shoe tree movable guide plate b to reciprocate along the axis of the second sliding rail c3 through the transmission block c4. When the shoe tree a is inserted into the shoe tree fixed guide plate h and the shoe tree movable guide plate b through the two groups of guide positioning blocks a1 respectively, the gas cylinder c5 drives the shoe tree movable guide plate b to move along the axis of the sliding rail through the transmission block c4. Since the sliding rail is parallel to the right longitudinal center positioning groove b1, the shoe tree movable guide plate b maintains a stable direction during movement until the centering positioning device d and the overturning positioning device e clamp the shoe tree a, facilitating subsequent processing operations. After processing is completed, the centering positioning device d and the overturning positioning device e are withdrawn, the gas cylinder c5 drives the shoe tree movable guide plate b to move in the opposite direction along the sliding rail, and the shoe tree a is released.

[0044] The centering positioning device d comprises a centering frame d1 and a lead screw rotatably mounted on the centering frame d1 through bearings at both ends. The centering frame d1 is detachably mounted on the last fixing guide plate h through screws. The lead screw is sequentially provided with a right-handed screw segment d2 and a left-handed screw segment d3 along the axial direction of the lead screw. The right-handed screw segment d2 and the left-handed screw segment d3 are symmetrically arranged. The right-handed screw segment d2 is threadedly connected with a right-handed nut sleeve d4, and the left-handed screw segment d3 is threadedly connected with a left-handed nut sleeve d5. The right-handed nut sleeve d4 is connected with a right-handed centering block d6, and the left-handed nut sleeve d5 is connected with a left-handed centering block d7. The lead screw is connected with a rotary driving mechanism capable of driving the lead screw to rotate. When the rotary driving mechanism drives the lead screw to rotate, the right-handed centering block d6 and the left-handed centering block d7 can move closer to or away from each other. When the rotary driving mechanism is started, the lead screw is driven to rotate. With the rotation of the lead screw, the right-handed nut sleeve d4 and the left-handed nut sleeve d5 move on the right-handed screw segment d2 and the left-handed screw segment d3, respectively. Since the threads are in opposite directions (the right-handed screw segment d2 and the left-handed screw segment d3 are symmetrically arranged), the two nut sleeves will move in opposite directions. The right-handed nut sleeve d4 and the left-handed nut sleeve d5 are connected with the right-handed centering block d6 and the left-handed centering block d7, respectively. Therefore, when the nut sleeves move, the centering blocks will also move. When the lead screw rotates to move the two nut sleeves towards each other, the two centering blocks will also move closer to each other, until the upper end of the last a is clamped and positioned in the middle of the last fixing guide plate h. Conversely, when the lead screw rotates to move the two nut sleeves away from each other, the two centering blocks will move away from each other to release the last a. With the centering positioning device d designed in the application, the upper end of the last a is exposed, which facilitates the positioning hole processing. Meanwhile, the structure is simple, the entire mechanism has low cost, and fast centering and clamping can be realized.

[0045] A last heel limiting block f is arranged below the lead screw and detachably connected with the last fixing guide plate h through screws. The last heel limiting block f positions the heel part of the last a, thereby preliminarily positioning the last a in the correct position. The last heel limiting block f is detachably connected with the centering frame d1 through screws, thereby realizing quick disassembly and assembly of the last heel limiting block f to adapt to different specifications and types of the last a.

[0046] The rotating driving mechanism comprises a centering driving driven sprocket d8 connected with the end of the screw rod, the centering driving driven sprocket d8 is connected with a centering driving driving sprocket d9 through a chain (not shown in the figure), the centering driving driving sprocket d9 is connected with a centering hydraulic motor d10, and the body of the centering hydraulic motor d10 is mounted on the centering frame d1. When the centering positioning device d works, the centering hydraulic motor d10 drives the centering driving driving sprocket d9 to rotate, the centering driving driving sprocket d9 is connected with the centering driving driven sprocket d8 through a chain, when the centering driving driving sprocket d9 rotates, the chain drives the centering driving driven sprocket d8 to rotate synchronously, so as to drive the screw rod to rotate, and the two groups of centering blocks are close to each other, so as to clamp and center the upper part of the shoe tree a.

[0047] The orthodontic nut sleeve d4 is sleeved with a first linkage block d11, one side of the first linkage block d11 is detachably connected with a first sliding block d12 through a screw, the first sliding block d12 is slidingly matched with a first sliding rail d13, the first sliding rail d13 is fixed on the centering frame d1 and is parallel to the screw rod, and the other side of the first linkage block d11 is detachably connected with the orthodontic centering block d6 through a screw; the reverse tooth nut sleeve d5 is sleeved with a second linkage block d14, one side of the second linkage block d14 is detachably connected with a second sliding block d15 through a screw, the second sliding block d15 is slidingly matched with the first sliding rail d13, and the other side of the second linkage block d14 is detachably connected with the reverse tooth centering block d7 through a screw. The linkage block is used as an intermediate part for connecting the nut sleeve and the sliding block, and the linkage block can convert the movement of the nut sleeve into the movement of the sliding block. At the same time, the linkage block is detachably connected with the centering block through a screw, so that the installation and disassembly of the centering block are facilitated. Through the first sliding rail d13, the first sliding block d12 and the second sliding block d15, the stress on the screw rod is reduced, and the movement stability of the two groups of centering blocks is improved.

[0048] The turnover positioning device e includes a clamping body e1 and a support frame e2, the support frame e2 is detachably installed on the shoe tree movable guide plate b through screws, one end of the clamping body e1 is connected with a rotating shaft e3, both ends of the rotating shaft e3 are hingedly connected to the support frame e2 through bearings, the end of the rotating shaft e3 is connected with a second driven sprocket e4, the second driven sprocket e4 is connected with a second driving sprocket through a chain (not shown in the figure), the second driving sprocket is connected with a turnover hydraulic motor e6, and the turnover hydraulic motor e6 is installed on the support frame e2. When the turnover positioning device e moves towards the shoe tree a along with the shoe tree movable guide plate b, until close to the shoe tree a, the turnover hydraulic motor e6 drives the second driving sprocket to rotate, the chain drives the second driven sprocket e4 to rotate synchronously, thereby driving the rotating shaft e3 to rotate, and one end of the clamping body e1 rotates accordingly, until the other end of the clamping body e1 is turned over to the shoe tree a, the two sides of the shoe tree a are pressed tightly, and the shoe tree a is fixed. The clamping body e1 directly acts on the shoe tree a, so that the shoe tree a is positioned or released, and compared with the traditional linear movement mode, the space is greatly saved. Further, the turnover hydraulic motor e6 is adopted, not only the response speed is high, but also the turnover angle of the clamping body e1 can be changed according to actual needs, so as to adapt to shoe trees a of different specifications and types.

[0049] A last head limiting block g is arranged below the clamping body e1, and the two sides of the last head limiting block g are detachably connected to the two sides of the shoe tree movable guide plate b through screws. The last head limiting block g positions the front end of the shoe tree a, so that the shoe tree a is preliminarily positioned at the correct position. When the clamping body e1 clamps the shoe tree a, the last head limiting block g continues to play a supporting and limiting role, so that the shoe tree a does not shake or deviate during the positioning process, and the stability and accuracy of the positioning of the shoe tree a are greatly improved. Further, the two sides of the last head limiting block g are detachably connected to the two sides of the shoe tree movable guide plate b through screws, so that the last head limiting block g can be replaced to adapt to the positioning needs of different shoe trees a.

[0050] The other end of the clamping body e1 is provided with a U-shaped groove e7, the U-shaped groove e7 is open at the end away from the rotating shaft e3, the other end of the U-shaped groove e7 is provided with symmetrically distributed V-shaped edges e8, and the open end of the clamping body e1 located in the U-shaped groove e7 is provided with an arc chamfer e5. The U-shaped groove e7 is used for accommodating and positioning the shoe tree a, and the end of the U-shaped groove e7 is provided with an opening, so that the clamping body e1 can conveniently enter or exit the shoe tree a. The V-shaped edges e8 are convenient for adapting to the arc shape of the front side of the shoe tree a. The arc chamfer e5 avoids scratching the hand of the operator, and protects the operator.

[0051] It should be noted that the shoe tree a applied in the embodiment is provided with two groups of guiding positioning blocks a1 on the tread, one group of guiding positioning blocks a1 is located near the toe part, and the other group of guiding positioning blocks a1 is located at the heel, and symmetric positioning reference planes a2 are arranged on the two sides of each group of guiding positioning blocks a1 respectively, the positioning reference planes a2 are kept parallel to the upper end surface of the shoe tree a, and the purpose is to guide the upper end surface of the shoe tree a.

[0052] The operation method of the embodiment is as follows:

[0053] Firstly, the linear motion mechanism c drives the shoe tree movable guide plate b to move to an initial position, so that the distance between the shoe tree fixed guide plate h and the shoe tree movable guide plate b is large enough to accommodate the insertion of a shoe tree a.

[0054] Secondly, the tread of the shoe tree a is directed towards the two shoe tree guide plates, and the two groups of guiding positioning blocks a1 are inserted into the left longitudinal center positioning groove h1 and the right longitudinal center positioning groove b1 respectively, so as to ensure that the placement direction of the shoe tree a is correct and unique.

[0055] Further, the shoe tree a is moved to the heel to contact the tree heel limiting block f, the centering positioning device d clamps the upper part of the shoe tree a, and the upper part of the shoe tree a is centered and positioned.

[0056] Finally, the linear motion mechanism c is started to drive the shoe tree movable guide plate b to move to the left until the toe of the shoe tree a contacts the tree head limiting block g. Then the turnover positioning device e presses the shoe tree a tightly, so that the positioning reference planes a2 on the two sides of each group of guiding positioning blocks a1 of the shoe tree a respectively contact the planes of the shoe tree fixed guide plate h and the shoe tree movable guide plate b. At this time, the position and direction of the shoe tree a are firmly locked, so as to realize the positioning of the upper end surface of the shoe tree a, ensure that it is located on the horizontal plane, accurately perform the reference positioning, and promote the accurate position and direction of the positioning hole.

[0057] In summary, the shoe tree a processing special clamping tool provided by the embodiment can ensure that the upper end of the shoe tree a is kept horizontal, ensure that the direction of the shoe tree a is placed correctly, stably fix the shoe tree a, effectively prevent the displacement of the shoe tree a during processing, ensure the accuracy of the positioning hole, and also adapt to different specifications and types of shoe trees a.

Claims

1. A clamping tool for processing shoe lasts, comprising a frame, characterized in that: The rack is provided with relatively distributed shoe tree fixed guide plates and shoe tree movable guide plates below, the shoe tree fixed guide plate is fixed on the rack, the shoe tree fixed guide plate is provided with a left longitudinal center positioning slot on the side towards the shoe tree movable guide plate, the left longitudinal center positioning slot is open at the end towards the shoe tree movable guide plate, the shoe tree movable guide plate is provided with a right longitudinal center positioning slot on the side towards the shoe tree fixed guide plate, the right longitudinal center positioning slot is open at the end towards the shoe tree fixed guide plate, the shoe tree movable guide plate is linked with a linear motion mechanism, the linear motion mechanism can drive the shoe tree movable guide plate to reciprocate towards the shoe tree fixed guide plate, the shoe tree fixed guide plate is linked with a centering positioning device capable of clamping the shoe tree above, and the shoe tree movable guide plate is linked with a turnover positioning device capable of pressing the shoe tree.

2. The special jig for processing a shoe last according to claim 1, wherein: The centering positioning device comprises a centering frame and a screw rod rotatably mounted on the centering frame through bearings at both ends, the centering frame is detachably mounted on the shoe tree fixed guide plate through screws, the screw rod is sequentially provided with a right-handed screw rod segment and a left-handed screw rod segment along the axial direction of the screw rod, the right-handed screw rod segment and the left-handed screw rod segment are symmetrically arranged, the right-handed screw rod segment is threadedly linked with a right-handed screw nut sleeve, the left-handed screw rod segment is threadedly linked with a left-handed screw nut sleeve, the right-handed screw nut sleeve is linked with a right-handed centering block, the left-handed screw nut sleeve is linked with a left-handed centering block, the screw rod is linked with a rotary drive mechanism capable of driving the screw rod to rotate, when the rotary drive mechanism drives the screw rod to rotate, the right-handed centering block and the left-handed centering block can approach or separate from each other.

3. The special jig for processing a shoe last according to claim 2, wherein: A last heel limiting block is arranged below the screw rod and detachably connected to the shoe tree fixed guide plate through screws.

4. The special jig for processing a shoe last according to claim 3, wherein: The rotary drive mechanism comprises a centering drive driven sprocket linked with the end of the screw rod, the centering drive driven sprocket is linked with a centering drive driving sprocket through a chain, the centering drive driving sprocket is linked with a centering hydraulic motor, and the body of the centering hydraulic motor is mounted on the centering frame.

5. The special jig for processing a shoe last according to claim 4, wherein: A first linkage block is peripherally sleeved on the right-handed screw nut sleeve, one side of the first linkage block is detachably connected with a first sliding block through screws, the first sliding block is slidably fitted with a first sliding rail, the first sliding rail is fixed on the centering frame and parallel to the screw rod, and the other side of the first linkage block is detachably connected with the right-handed centering block through screws; a second linkage block is peripherally sleeved on the left-handed screw nut sleeve, one side of the second linkage block is detachably connected with a second sliding block through screws, the second sliding block is slidably fitted with the first sliding rail, and the other side of the second linkage block is detachably connected with the left-handed centering block through screws.

6. The special jig for processing a shoe last according to claim 1, wherein: The turnover positioning device comprises a clamping body and a support frame, the support frame is detachably mounted on the shoe tree movable guide plate through screws, one end of the clamping body is linked with a rotating shaft, both ends of the rotating shaft are hingedly connected to the support frame through bearings, the end of the rotating shaft is linked with a second driven sprocket, the second driven sprocket is linked with a second driving sprocket through a chain, the second driving sprocket is linked with a turnover hydraulic motor, and the turnover hydraulic motor is mounted on the support frame.

7. The special jig for processing a shoe last according to claim 6, wherein: The last limiting block is detachably connected with the two sides of the shoe last movable guide plate through screws.

8. The special jig for processing a shoe last according to claim 7, wherein: The other end of the clamping body is provided with a U-shaped groove, the end of the U-shaped groove away from the rotating shaft is in an open shape, the other end of the U-shaped groove is provided with symmetrically distributed V-shaped welting, and the clamping body at the open end of the U-shaped groove is provided with an arc chamfer.

9. The special jig for processing a last according to any one of claims 1 to 8, characterized by: The left and right longitudinal center positioning grooves are parallel to each other and located on the same straight track, the upper end surface of the shoe last fixed guide plate is a left positioning reference plane, the upper end surface of the shoe last movable guide plate is a right positioning reference plane, and the left and right positioning reference planes are parallel to each other and located on the same horizontal plane.

10. The special jig for processing a shoe last according to claim 9, wherein: The linear motion mechanism comprises a lifting block fixed to the lower side of the shoe last movable guide plate through a screw, the lifting block is connected with a third sliding block, the third sliding block is slidingly matched with a second sliding rail, the second sliding rail is fixed to the rack and parallel to the right longitudinal center positioning groove, a transmission block is fixedly arranged below the shoe last movable guide plate, the transmission block is connected with a gas cylinder, the body of the gas cylinder is fixed to the rack, and the gas cylinder can drive the shoe last movable guide plate to reciprocate along the axial direction of the second sliding rail through the transmission block.

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