Large thin-wall circular ring workpiece clamping device

Abstract

The utility model relates to the field of workpiece clamping, in particular to a large thin-wall circular ring workpiece clamping device which comprises a machine tool workbench and a first pressing mechanism arranged on the machine tool workbench. A plurality of mounting grooves are formed in the machine tool workbench; the first pressing mechanism comprises multiple sets of positioning assemblies and multiple sets of pressing assemblies, each positioning assembly comprises a positioning seat and a positioning block, the positioning seats are arranged on the machine tool workbench, and the positioning blocks are arranged at the upper ends of the positioning seats; the pressing assembly comprises two first supporting cylinders, a first rod and a pressing plate, the first supporting cylinders are arranged on the machine tool workbench, the bottom end of the first rod is slidably arranged on the machine tool workbench through a mounting groove, the pressing plate is arranged at the top end of the first rod, and one end of the pressing plate is hinged to a telescopic rod of one first supporting cylinder. According to the utility model, the clamping efficiency can be improved and the clamping error can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of workpiece clamping, especially a large thin-walled ring workpiece clamping device. BACKGROUND

[0002] In the turning and milling process of large thin-walled ring products, accurate positioning is the key to ensuring machining accuracy. The existing positioning method often cannot meet the requirements of such products. On the one hand, due to the arc surface of the product, the conventional positioning reference (such as planar positioning) cannot effectively determine its accurate position in the machine tool workbench coordinate system. On the other hand, for large-size thin-walled arc products, their weight and volume are large, and small displacement during clamping and processing will cause positioning deviation.

[0003] At present, some existing special fixtures are mostly for products of specific shape or size range, and have poor universality. For large thin-walled arc products of different radii, different wall thicknesses and sizes, the fixture needs to be frequently replaced or adjusted, which not only increases the processing cost, but also reduces the processing efficiency. Moreover, during the processing, due to the lack of effective clamping and positioning integration technology, repositioning and clamping are often needed several times, which further introduces the possibility of positioning error and clamping deformation.

[0004] Therefore, how to clamp products of specific shape or size range to improve clamping efficiency and reduce clamping error has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] In order to improve the clamping efficiency and reduce the clamping error, the utility model provides a large thin-walled ring workpiece clamping device.

[0006] The utility model provides a large thin-walled ring workpiece clamping device, adopt the following technical scheme:

[0007] A large thin-walled ring workpiece clamping device, comprising a machine tool workbench, a plurality of first pressing mechanisms and a plurality of second pressing mechanisms;

[0008] The machine tool workbench comprises a base and a plurality of extension tables, a plurality of mounting grooves are evenly arranged at the top end of the base, the extension tables are installed on the base through the mounting grooves, and a plurality of mounting ports are arranged on the extension tables in the axial direction of the mounting grooves; the first pressing mechanism comprises a plurality of positioning assemblies and a plurality of pressing assemblies for pressing the workpiece, the positioning assembly comprises a positioning seat and a positioning block, a plurality of positioning seats are circumferentially arranged at the top end of the machine tool workbench, and the positioning block is adjustably arranged at the top end of the positioning seat; the pressing assemblies are evenly arranged on the base through the mounting grooves;

[0009] The second pressing mechanism comprises an adjusting cylinder, which is arranged on the extension table through one of the mounting openings.

[0010] By adopting the above technical scheme, the workpiece blank to be processed is placed on the first pressing mechanism, the inner ring of the workpiece abuts against the positioning block, and the plurality of positioning blocks position the inner ring of the workpiece, thereby coaxially positioning the workpiece and the machine tool table, reducing the fixing error, and by adjusting the mounting position of the positioning seat, the positioning of workpieces of different sizes can be adapted. The plurality of pressing assemblies simultaneously fix the workpiece, improving the stability of the fixing and reducing the process of manual calibration and adjustment. At the same time, the length of the first rod is used to position the height and distance of the end part of the workpiece after clamping, thereby reducing the clamping error of the workpiece, and the machining precision of the workpiece in the subsequent machining process is higher.

[0011] While the first pressing mechanism fixes the workpiece, the second pressing mechanism fixes and supports the outer ring of the workpiece. By adjusting the length of the telescopic cylinder of the adjusting cylinder, the outer ring of the workpiece is tightly abutted and supported, so that the overall shape of the workpiece is maintained within the standard range. The support of the adjusting cylinder can improve the machining precision of the product after the workpiece is machined.

[0012] Optionally, the positioning assembly further comprises an adjusting seat and an adjusting screw rod, the adjusting seat is fixedly arranged at the top end of the positioning seat, one end of the adjusting screw rod is rotatably arranged on the adjusting seat, and the positioning block is slidably arranged on the adjusting seat, and the other end of the adjusting screw rod is threadedly connected with the positioning block.

[0013] By adopting the above technical scheme, the coaxiality of the workpiece is adjusted. By rotating the adjusting screw rod, the adjusting screw rod makes the positioning block slide on the adjusting seat, and when the coaxiality of the workpiece needs to be calibrated, the corresponding positioning block is moved and calibrated, thereby making the coaxial positioning precision of the workpiece more accurate.

[0014] Optionally, the pressing assembly comprises a first supporting cylinder, a first rod and a pressing plate, a plurality of first supporting cylinders are arranged circumferentially on the machine tool table, the bottom end of the first rod is slidably arranged on the machine tool table through the mounting slot, the pressing plate is slidably arranged on the top end of the first rod, one first rod and two first supporting cylinders form a group, one end of the pressing plate is hinged to the telescopic rod of one of the first supporting cylinders, and the other end of the pressing plate is located at the upper end of the supporting rod of the other first supporting cylinder in the group.

[0015] By adopting the technical scheme, the bottom end of the first rod is slid and clamped in the mounting groove to fix the workpiece, the clamping end on the telescopic rod of the adjacent two first supporting cylinders is pushed to abut against the pressing plate on the first rod and the adjusting nut at the top end of the first rod, then the clamping end on the telescopic rod of the other adjacent first supporting cylinder is contacted with the workpiece, and the workpiece is fixed under the mutual extrusion of the pressing plates.

[0016] Optionally, the pressing plate is provided with an adjusting groove, and the first rod slides on the pressing plate through the adjusting groove.

[0017] By adopting the technical scheme, in the clamping process, the first rod slides in the adjusting groove to adjust the direction of the pressing plate and the abutment position of the pressing plate, or when the workpiece needs to be taken out, the pressing plate is rotated to be separated from the surface of the workpiece, so that the workpiece is conveniently taken out, and preparation is made for the next clamping and fixing.

[0018] Optionally, the machine tool workbench further comprises a connecting assembly, the connecting assembly comprises connecting blocks and connecting rods, the connecting blocks are arranged on the extension tables through one of the mounting holes, and the connecting rods are fixedly connected to the connecting blocks at two ends.

[0019] By adopting the technical scheme, the two adjacent extension tables are connected to each other through the connecting assembly, the distance between the connecting blocks at two ends of the connecting rod is adjusted, the extension tables are pulled tightly to each other, the stability of the extension tables is improved, the deviation of the extension tables when fixing the workpiece is reduced, and the positioning error of the fixing is reduced.

[0020] Optionally, the second pressing mechanism further comprises extension plates, a plurality of the extension plates are arranged in a circumferential arrangement on the extension table, the extension plates are provided with mounting holes, and the adjusting cylinders are arranged in the mounting holes of the extension plates.

[0021] By adopting the technical scheme, according to different sizes and structures of the workpiece, the position of the extension plate on the extension table is adjusted, the position of the adjusting cylinder is adjusted, the device can be adjusted according to the fixing needs of the workpiece, the device can be adjusted more conveniently when coping with different models of products, the workpiece can be fixed without replacing the equipment, and the application range of the device is improved.

[0022] Optionally, the second pressing mechanism further comprises an arc-shaped pressing plate, a second rod and a guide rod, one end of the arc-shaped pressing plate is provided with a slope or an arc shape, the bottom end of the second rod is provided on the extension plate, the top end of the arc-shaped pressing plate is slidably provided on the top end of the second rod through a sliding groove, the top end of the second rod is threadedly connected with an adjusting nut, the height of the arc-shaped pressing plate is adjusted by rotating the adjusting nut, and the guide rod is provided at one end of the arc-shaped pressing plate and abuts against the extension table at the other end.

[0023] By adopting the above technical scheme, the arc-shaped pressing plate is installed on the extension plate while the workpiece is pressed by the adjusting cylinder, the inner arc surface of the arc-shaped pressing plate is attached to the surface of the workpiece, and one end of the arc-shaped pressing plate is limited to the edge of the workpiece, so that the edge of the workpiece is fully supported and shaped, the deviation of the large thin-walled workpiece in the fixing and positioning process is reduced, and the fixing and positioning accuracy of the device is further improved.

[0024] Optionally, the extension plate is provided with a plurality of positioning grooves and a plurality of mounting holes at the end away from the base, and the bottom end of the second rod is mounted on the extension plate through the positioning grooves.

[0025] By adopting the above technical scheme, the plurality of positioning grooves provide a plurality of mounting positions of the arc-shaped plate, which can be adjusted according to the size of the workpiece, and the plurality of mounting holes provide a plurality of selection positions for the mounting position of the adjusting cylinder, which can be adjusted according to the size requirement of the workpiece, so that the device can be applied to workpieces of various sizes.

[0026] Optionally, the second pressing mechanism further comprises a fixing assembly, the fixing assembly comprises a pressing cylinder, a third rod, a fixing plate and a fixing block, the pressing cylinder is arranged at one end of the extension table close to the extension plate, one or more pressing cylinders are arranged corresponding to one extension plate, the bottom end of the third rod is slidably arranged on the extension table through the mounting groove, the top end of the third rod is slidably connected with the fixing plate, the top end of the fixing block is connected with the fixing plate, and the bottom end of the fixing block abuts against the extension plate.

[0027] By adopting the above technical scheme, when the position of the extension plate needs to be adjusted, the adjusting nut on the third rod is adjusted, the pressing force of the fixing plate on the extension plate is reduced, the position of the extension plate is adjusted, the third rod is adjusted, the pressing cylinder pushes the fixing plate to re-press and fix the extension plate, and the fixing range of the device is further expanded.

[0028] Optionally, the extension table is further provided with a plurality of supporting mechanisms, the supporting mechanism comprises a supporting inclined seat, a plurality of supporting rods and a plurality of universal supporting pieces, a plurality of the supporting inclined seats are circumferentially arranged on the upper end surface of the extension table, the supporting rods are arranged on the inclined surfaces of the supporting inclined seats, and the universal supporting pieces are rotationally arranged at the top ends of the supporting rods and are provided with supporting surfaces.

[0029] By adopting the technical scheme, after the workpiece is fixed, the plurality of supporting mechanisms support the bottom end surface of the workpiece, the workpiece is supported by the plurality of universal supporting frames, when the coaxiality of the workpiece is adjusted or the fixing position of the workpiece is adjusted, the plurality of universal supporting pieces are rotationally adjusted on the supporting rods, the universal supporting pieces can better contact and support the bottom end of the workpiece, the contact area of the supporting mechanism and the product is effectively increased, the supporting rigidity is increased, and the effective support of the special workpiece shape such as the uneven blank surface or the arc surface can be met.

[0030] In summary, the utility model has at least one of the following beneficial technical effects:

[0031] By arranging the first pressing mechanism, the plurality of positioning blocks position the inner ring of the workpiece, the workpiece is coaxially positioned with the machine tool table, the fixing error is reduced, the installation position of the positioning seat can be adjusted to position workpieces of different sizes, the stability of fixing is improved, the process of manual calibration and adjustment is reduced, the height and distance of the end part of the workpiece are positioned by clamping through the length of the first rod, and the clamping error of the workpiece is reduced. By arranging the adjusting screw, when the coaxiality of the workpiece needs to be calibrated, the corresponding positioning block is moved for calibration, and the coaxial positioning accuracy of the workpiece is more accurate. By arranging the second pressing mechanism, the device can be adjusted according to the fixing needs of the workpiece, different models of products can be adjusted more conveniently, the workpiece can be fixed without replacing the equipment, and the application range of the device is improved. By arranging the supporting mechanism, the contact area of the supporting mechanism and the product is increased, the supporting rigidity is increased, and the effective support of the special workpiece shape such as the uneven blank surface or the arc surface can be met. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the overall structure schematic diagram of the utility model embodiment when clamping the workpiece;

[0033] Figure 2 is the overall structure schematic diagram of the utility model embodiment;

[0034] Figure 3 is the structure schematic diagram of the machine tool table of the utility model;

[0035] Figure 4 is the schematic diagram of the positioning assembly and the pressing assembly of the utility model;

[0036] Figure 5 is a structure schematic view of a long type second pressing mechanism of the utility model;

[0037] Figure 6 is a structure schematic view of a short type second pressing mechanism of the utility model;

[0038] Figure 7 is a structure schematic view of a support mechanism of the utility model;

[0039] Figure 8 is a sectional view schematic view of the support mechanism of the utility model.

[0040] Mark explanation: 100, machine tool workbench;110, installation groove;120, base;130, extension table;140, connecting assembly;141, connecting block;142, connecting rod;150, installation port;200, first pressing mechanism;210, positioning assembly;211, positioning seat;212, positioning block;213, adjusting seat;214, adjusting screw;220, pressing assembly;221, first support cylinder;222, first rod;223, pressing plate;224, adjusting groove;300, second pressing mechanism;310, adjusting cylinder;320, extension plate;330, arc pressing plate;340, second rod;350, guide rod;360, adjusting nut;370, positioning groove;380, fixing assembly;381, pressing cylinder;382, third rod;383, fixed plate;384, fixed block;400, support mechanism;410, support inclined seat;420, support rod;430, universal support piece. DETAILED DESCRIPTION

[0041] The following will be combined with the attached Figure 1 - attached Figure 8 , the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0042] It should be noted that all directionality indications (such as up, down, left, right, front, back...) in the utility model embodiment are only used to explain the relative position relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the directionality indication also changes accordingly.

[0043] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0044] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

[0046] The embodiment of the present application discloses a large thin-walled ring workpiece clamping device. Referring to the accompanying Figure 1 to the accompanying Figure 8 A large thin-walled ring workpiece clamping device mainly comprises a machine tool workbench 100, a first pressing mechanism 200 and a second pressing mechanism 300, the first pressing mechanism 200 is arranged on the machine tool workbench 100; the machine tool workbench 100 comprises a base 120 and a plurality of expansion tables 130, a plurality of mounting grooves 110 are evenly arranged at the top end of the base 120, the expansion table 130 is installed on the base 120 by means of bolt fixing and cooperation with the mounting groove 110; the first pressing mechanism 200 comprises a plurality of positioning assemblies 210 and a plurality of pressing assemblies 220, the positioning assembly 210 comprises a positioning seat 211 and a positioning block 212, the positioning seat 211 is arranged on the machine tool workbench 100, and the positioning block 212 is arranged at the upper end of the positioning seat 211;

[0047] The pressing assembly 220 comprises a first supporting cylinder 221, a first rod 222 and a pressing plate 223. The first supporting cylinders 221 are circumferentially arranged on the machine tool workbench 100. The bottom end of the first rod 222 is slidably arranged on the machine tool workbench 100 through the mounting slot 110. The pressing plate 223 is slidably arranged on the top end of the first rod 222. One first rod 222 and two first supporting cylinders 221 form a group. One end of the pressing plate 223 is hingedly connected to the telescopic rod of one of the first supporting cylinders 221. The other end of the pressing plate 223 is located at the upper end of the supporting rod 420 of the other first supporting cylinder 221 in the group.

[0048] The extension table 130 is provided with a plurality of second pressing mechanisms 300. The second pressing mechanism 300 comprises an adjusting cylinder 310. The extension table 130 is provided with a plurality of mounting holes 150 along the axial direction of the mounting slot 110. The adjusting cylinder 310 is arranged on the extension table 130 through one of the mounting holes 150.

[0049] The workpiece blank to be processed is arranged on the first pressing mechanism 200. The inner ring of the workpiece is abutted against the positioning block 212. The plurality of positioning blocks 212 are positioned relative to the inner ring of the workpiece. The workpiece is coaxially positioned with the machine tool workbench 100. The fixing error is reduced. The mounting position of the positioning seat 211 can be adjusted to be suitable for positioning workpieces of different sizes. The bottom end of the first rod 222 is slidably and clippably arranged in the mounting slot 110. The workpiece is fixed. The two adjacent first supporting cylinders 221 are telescopically arranged. The clamping end on the telescopic rod pushes the pressing plate 223 on the first rod 222 to abut against the adjusting nut 360 at the top end of the first rod 222. Then, the other adjacent first supporting cylinder 221 is telescopically arranged. The clamping end on the telescopic rod is in contact with the workpiece. The workpiece is fixed under the mutual extrusion of the pressing plates 223. The plurality of pressing assemblies 220 simultaneously fix the workpiece. The stability of the fixing is improved. The process of manual calibration and adjustment is reduced. The length of the first rod 222 is used to position the height and distance of the end part of the workpiece after clamping. The clamping error of the workpiece is reduced. The machining precision of the workpiece is higher in the subsequent machining process.

[0050] While the first pressing mechanism 200 fixes the workpiece, the second pressing mechanism 300 is used to fix and support the outer ring of the workpiece. The length of the telescopic rod of the adjusting cylinder 310 is adjusted to abut and support the outer ring of the workpiece. The shape of the whole workpiece is maintained within the standard range. The support of the adjusting cylinder 310 can improve the machining precision of the product after the workpiece is machined.

[0051] In some embodiments, the positioning assembly 210 further comprises an adjusting seat 213 fixedly arranged at the top end of the positioning seat 211, and an adjusting screw 214 rotatably arranged at one end of the adjusting seat 213, and the positioning block 212 is slidably arranged on the adjusting seat 213, and the other end of the adjusting screw 214 is threadedly connected with the positioning block 212. The coaxiality of the workpiece is adjusted by rotating the adjusting screw 214, the adjusting screw 214 slides the positioning block 212 on the adjusting seat 213, and when the coaxiality of the workpiece needs to be calibrated, the corresponding positioning block 212 is moved and calibrated, so that the coaxial positioning accuracy of the workpiece is more accurate.

[0052] In some embodiments, the pressing plate 223 is provided with an adjusting groove 224, and the first rod 222 slides on the pressing plate 223 through the adjusting groove 224. During clamping, the first rod 222 is slid in the adjusting groove 224 to adjust the direction of the pressing plate 223, and then the abutting position of the pressing plate 223 is adjusted, or when the workpiece needs to be taken out, the pressing plate 223 is rotated to separate from the surface of the workpiece, thereby facilitating the taking out of the workpiece and preparing for the next clamping and fixing.

[0053] In some embodiments, the machine tool workbench 100 further comprises a connecting assembly 140, the connecting assembly 140 comprises a connecting block 141 and a connecting rod 142, the connecting block 141 is arranged on the extension table 130 through one of the mounting holes 150, and the connecting rod 142 is fixedly connected with one connecting block 141 at each end, and two adjacent extension tables 130 are fixedly connected through the connecting assembly 140. The two adjacent extension tables 130 are connected to each other through the connecting assembly 140, and the distance between the two connecting blocks 141 at the two ends of the connecting rod 142 is adjusted, so that the extension tables 130 are pulled tightly with each other, the stability of the extension tables 130 is improved, and the possibility of deviation of the extension tables 130 when fixing the workpiece is reduced, thereby reducing the positioning error of the fixing.

[0054] In some embodiments, the second pressing mechanism 300 further comprises an extension plate 320, a plurality of extension plates 320 are arranged in a circumferential arrangement manner on the extension table 130, the extension plate 320 is provided with a mounting hole 150, and the adjusting cylinder 310 is arranged in the mounting hole 150 of the extension plate 320. According to different sizes and structures of the workpiece, the position of the extension plate 320 on the extension table 130 is adjusted, and then the position of the adjusting cylinder 310 is adjusted, so that the device can be adjusted according to the fixing needs of the workpiece. When different models of products are dealt with, the device can be adjusted more conveniently without the need to replace the equipment to fix the workpiece, thereby improving the application range of the device.

[0055] In some embodiments, the second pressing mechanism 300 further comprises an arc-shaped pressing plate 330, a second rod 340 and a guide rod 350, one end of the arc-shaped pressing plate 330 is beveled or arc-shaped, the bottom end of the second rod 340 is arranged on the extension plate 320, the top end of the arc-shaped pressing plate 330 is slidingly arranged on the top end of the second rod 340 in the form of a sliding groove, an adjusting nut 360 is threadedly connected to the top end of the second rod 340, the height of the arc-shaped pressing plate 330 is adjusted by rotating the adjusting nut 360, the guide rod 350 is arranged at one end of the arc-shaped pressing plate 330, and the other end of the guide rod 350 abuts against the extension table 130. While the workpiece is pressed by the adjusting cylinder 310, the arc-shaped pressing plate 330 is installed on the extension plate 320, the inner arc surface of the arc-shaped pressing plate 330 is attached to the surface of the workpiece, and one end of the arc-shaped pressing plate 330 is limited by the edge of the workpiece, so that the edge of the workpiece is fully supported and shaped, the deviation of the large thin-walled workpiece during fixing and positioning is reduced, and the fixing and positioning accuracy of the device is further improved.

[0056] In some embodiments, the end of the extension plate 320 away from the base 120 is provided with a plurality of positioning grooves 370 and a plurality of mounting holes 150, and the bottom end of the second rod 340 is mounted on the extension plate 320 through the positioning grooves 370. The plurality of positioning grooves 370 provide a plurality of mounting positions for the arc-shaped plates, which can be adjusted according to the size of the workpiece, and the plurality of mounting holes 150 provide a plurality of choices for the mounting position of the adjusting cylinder 310, which can be adjusted according to the size requirements of the workpiece, so that the device can be applied to workpieces of various sizes.

[0057] In some embodiments, the second pressing mechanism 300 further comprises a fixing assembly 380, the fixing assembly 380 comprises a pressing cylinder 381, a third rod 382, a fixing plate 383 and a fixing block 384, the pressing cylinder 381 is arranged at one end of the extension table 130 close to the extension plate 320, one or more pressing cylinders 381 are arranged corresponding to one extension plate 320, the bottom end of the third rod 382 is slidingly arranged on the extension table 130 through the mounting groove 110, the top end of the third rod 382 is slidingly connected with the fixing plate 383, the top end of the fixing block 384 is connected with the fixing plate 383, and the bottom end of the fixing block 384 abuts against the extension plate 320. When the position of the extension plate 320 needs to be adjusted, the adjusting nut 360 on the third rod 382 is adjusted, so as to reduce the pressing force of the fixing plate 383 on the extension plate 320, then the position of the extension plate 320 is adjusted, and then the third rod 382 is adjusted to make the pressing cylinder 381 push the fixing plate 383 to re-press and fix the extension plate 320, thereby further expanding the fixing range of the device.

[0058] In some embodiments, a plurality of support mechanisms 400 are further arranged on the extension table 130, the support mechanisms 400 comprising a plurality of support inclined seats 410, a plurality of support rods 420 and a plurality of universal support pieces 430, the plurality of support inclined seats 410 being circumferentially arranged on the upper end surface of the extension table 130, the support rods 420 being arranged on the inclined surfaces of the support inclined seats 410, the universal support pieces 430 being rotatably arranged at the top ends of the support rods 420, and the universal support pieces 430 being provided with support surfaces. After the workpiece is fixed, the plurality of support mechanisms 400 support the bottom end surface of the workpiece, the workpiece is supported by the plurality of universal support pieces, and when the coaxiality of the workpiece is adjusted or the fixing position of the workpiece is adjusted, the universal support pieces 430 are rotated on the support rods 420 to adjust, so that the universal support pieces 430 can better contact and support the bottom end of the workpiece, effectively increase the contact area between the support mechanisms 400 and the product, increase the support rigidity, and can meet the effective support of the special workpiece shape of the uneven blank surface or the arc surface.

[0059] The implementation principle of the large-thin-wall annular workpiece clamping device is as follows:

[0060] By arranging the first pressing mechanism 200, the inner ring of the workpiece is positioned by the plurality of positioning blocks 212 to be coaxial with the machine tool workbench 100, the fixing error is reduced, the position of the positioning seat 211 can be adjusted to adapt to workpieces of different sizes, the fixing stability is improved, manual calibration is reduced, the clamping error can be reduced by the length of the first rod 222, the adjusting screw 214 is arranged, the positioning block 212 is moved when the coaxiality of the workpiece needs to be calibrated, and the coaxial positioning precision is improved; the second pressing mechanism 300 is arranged, so that the device can be adjusted according to the fixing needs of the workpiece, different models of products can be conveniently dealt with, the workpiece can be fixed without replacing the equipment, and the application range is expanded; the support mechanism 400 is arranged, the contact area and the support rigidity of the support mechanism 400 and the product are increased, and the effective support of the special workpiece shape of the uneven blank surface or the arc surface is met.

[0061] The above are preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A clamping device for large thin-walled circular ring workpieces, characterized in that: The machine tool workbench (100), a plurality of first pressing mechanisms (200) and a plurality of second pressing mechanisms (300) are included. The machine tool workbench (100) includes a base (120) and a plurality of extension tables (130), a plurality of mounting grooves (110) are evenly arranged on the top end of the base (120), the extension tables (130) are mounted on the base (120) through the mounting grooves (110), and a plurality of mounting openings (150) are arranged on the extension tables (130) in the axial direction of the mounting grooves (110); the first pressing mechanism (200) includes a plurality of positioning assemblies (210) and a plurality of pressing assemblies (220) for pressing workpieces, the positioning assembly (210) includes a positioning seat (211) and a positioning block (212), a plurality of positioning seats (211) are circumferentially arranged on the top end of the machine tool workbench (100), and the positioning block (212) is adjustably arranged on the top end of the positioning seat (211); and the pressing assembly (220) is evenly arranged on the base (120) through the mounting grooves (110). The second pressing mechanism (300) includes an adjusting cylinder (310), and the adjusting cylinder (310) is arranged on the extension table (130) through one of the mounting openings (150).

2. The device for clamping a large thin-walled circular ring workpiece according to claim 1, characterized in that: The positioning assembly (210) further includes an adjusting seat (213) and an adjusting screw (214), the adjusting seat (213) is fixedly arranged on the top end of the positioning seat (211), one end of the adjusting screw (214) is rotatably arranged on the adjusting seat (213), the positioning block (212) is slidably arranged on the adjusting seat (213), and the other end of the adjusting screw (214) is threadedly connected with the positioning block (212).

3. The device for clamping a large thin-walled circular ring workpiece according to claim 1, characterized in that: The pressing assembly (220) includes a first supporting cylinder (221), a first rod (222) and a pressing plate (223), a plurality of first supporting cylinders (221) are circumferentially arranged on the machine tool workbench (100), the bottom end of the first rod (222) is slidably arranged on the machine tool workbench (100) through the mounting groove (110), and the pressing plate (223) is slidably arranged on the top end of the first rod (222); one first rod (222) and two first supporting cylinders (221) form a group, one end of the pressing plate (223) is hingedly connected with the telescopic rod of one of the first supporting cylinders (221), and the other end of the pressing plate (223) is located on the upper end of the supporting rod (420) of the other first supporting cylinder (221) in the group.

4. The device for clamping a large thin-walled circular ring workpiece according to claim 3, characterized in that: An adjusting groove (224) is arranged on the pressing plate (223), and the first rod (222) slides on the pressing plate (223) through the adjusting groove (224).

5. The device for clamping a large thin-walled circular ring workpiece according to any one of claims 1-4, characterized in that: The machine tool workbench (100) further comprises a connecting assembly (140), the connecting assembly (140) comprises connecting blocks (141) and connecting rods (142), the connecting blocks (141) are arranged on the extension tables (130) through one of the mounting holes (150), one end of each of the connecting rods (142) is fixedly connected with one of the connecting blocks (141), and two adjacent extension tables (130) are fixedly connected through the connecting assembly (140).

6. The device for clamping a large thin-walled circular ring workpiece according to any one of claims 1-3, characterized in that: The second pressing mechanism (300) further comprises extension plates (320), a plurality of the extension plates (320) are arranged in a circumferential arrangement mode on the extension tables (130), the extension plates (320) are provided with mounting holes (150), and the adjusting cylinders (310) are arranged in the mounting holes (150) of the extension plates (320).

7. A device for clamping a large thin-walled circular ring workpiece according to claim 6, characterized in that: The second pressing mechanism (300) further comprises an arc-shaped pressing plate (330), a second rod (340) and a guide rod (350), one end of the arc-shaped pressing plate (330) is arranged in a slope or arc shape, the bottom end of the second rod (340) is arranged on the extension plate (320), the top end of the arc-shaped pressing plate (330) is arranged on the top end of the second rod (340) in a sliding groove mode, the top end of the second rod (340) is threadedly connected with an adjusting nut (360), the height of the arc-shaped pressing plate (330) is adjusted by rotating the adjusting nut (360), and the guide rod (350) is arranged in one end of the arc-shaped pressing plate (330) and the other end of the guide rod (350) is abutted against the extension table (130).

8. The device for clamping a large thin-walled circular ring workpiece according to claim 7, characterized in that: The end, away from the base (120), of the extension plate (320) is provided with a plurality of positioning grooves (370) and a plurality of the mounting holes (150), and the bottom end of the second rod (340) is arranged on the extension plate (320) through the positioning grooves (370).

9. The device for clamping a large thin-walled circular ring workpiece according to claim 6, characterized in that: The second pressing mechanism (300) further comprises a fixing assembly (380), the fixing assembly (380) comprises pressing cylinders (381), third rods (382), fixing plates (383) and fixing blocks (384), the pressing cylinders (381) are arranged at one end of the extension table (130) close to the extension plates (320), one of the extension plates (320) corresponds one or more of the pressing cylinders (381), the bottom end of the third rod (382) is arranged on the extension table (130) in a sliding mode through the mounting groove (110), the top end of the third rod (382) is slidably connected with the fixing plate (383), the top end of the fixing block (384) is connected with the fixing plate (383), and the bottom end of the fixing block (384) is abutted against the extension plate (320).

10. The device for clamping a large thin-walled circular ring workpiece according to claim 4, characterized in that: The extension table (130) is also provided with a plurality of support mechanisms (400), which include support inclined seats (410), a plurality of support rods (420) and a plurality of universal support pieces (430). The plurality of support inclined seats (410) are circumferentially arranged on the upper end face of the extension table (130). The support rods (420) are arranged on the inclined faces of the support inclined seats (410). The universal support pieces (430) are rotationally arranged on the top ends of the support rods (420). The universal support pieces (430) are provided with support faces.

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