A rotary indexing tool for a slender workpiece with a partial arc cross section

Abstract

A rotary indexing fixture for slender workpieces with partial arc cross-sections comprises a base, a rotary support ring, and a roller bracket. The base comprises an upper support plate, a vertical plate, and a lower support plate connected vertically in sequence. The upper support plate has a workpiece slot, and workpiece fixing devices are provided at both ends of the workpiece slot. The interior of the rotary support ring is connected to the exterior of the base. The roller bracket is connected to the exterior of the rotary support ring. The roller bracket comprises two rollers and a base, and the rollers are laterally movable or fixed on the base. During application, the base is first placed into the rotary support ring and connected to the rotary support ring. Then, multiple roller brackets are connected to the rotary support ring. The base is then connected to the CNC indexing table and debugged. The workpiece is then placed on the base, the workpiece position is debugged and fixed, and then the workpiece is spray-molded. This design has a workpiece fixing device specifically for the workpiece being processed, and the fixture as a whole can provide good support for the middle portion of the workpiece being processed. Therefore, this design has a good processing effect.

Description

Technical Field

[0001] The invention relates to a processing tool, belongs to the field of mechanical processing, and in particular to a rotary indexing tool for a slender workpiece with a partial arc in cross section. Background Art

[0002] In the field of mechanical processing, a slender workpiece with a partial arc in the cross section needs to adopt an indexing processing technology when performing spray melting processing. This type of part is more than eight meters long and weighs about one ton, making it difficult to process.

[0003] A Chinese patent application with application number 201720145330.9 and application date of February 17, 2017 discloses a four-axis linkage rotary tooling, comprising a tooling base plate, a rotary drive device, and a manually driven tailstock. The rotary drive device is provided with a dividing plate and a drive mechanism for controlling the rotation of the dividing plate. The manually driven tailstock is provided with an umbrella-shaped rotary center. A positioning fixture is provided at the axis of the left end of the tooling base plate. The left end of the tooling base plate is closely attached to the tip of the umbrella-shaped rotary center via the positioning fixture. A machining tool and a four-axis CNC drive device for controlling the tool movement are provided above the tooling base plate. Although this design uses locating pins and screws for rapid positioning and clamping, and then uses four-axis linkage to process the theoretical shape, reducing processing time and manufacturing costs through the above methods, it still has the following defects:

[0004] The tooling base plate of this design lacks a device for clamping the workpiece, which can cause the workpiece to slip or fall off during machining, affecting the machining results. When machining slender workpieces with large deflections, the base plate lacks support underneath, which can cause the center of the workpiece to sag due to gravity, leading to a misalignment between the tool and the center of the workpiece, thus affecting the machining results. Consequently, the machining results of the prior art are poor.

[0005] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects and problems of poor processing effect in the prior art and to provide a rotary indexing tool for a slender workpiece with a partial arc in cross section with good processing effect.

[0007] To achieve the above objectives, the technical solution of the present invention is:

[0008] A rotary indexing fixture for a slender workpiece with a partial arc in cross section, the fixture comprising a base, a rotary support ring and a roller bracket;

[0009] The top of described supporting plate is hinged on being provided with a back-up plan view, and the bottom of described supporting plate is hinged on being provided with a back-up plan view, and the bottom of described supporting plate is hinged on being provided with a back-up plan view.

[0010] The slewing support ring is a semicircular ring, which is wrapped around the outside of the base. The tops of both sides of the slewing support ring are connected to the upper support plate, and the bottom of the slewing support ring is connected to the lower support plate.

[0011] The center lines of the multiple roller brackets are parallel to the center line of the slewing support ring. The roller brackets include two rollers and a base. The outer surfaces of the multiple rollers are connected to the outer surface of the slewing support ring. The rollers are connected to the base through roller brackets. The movement stroke of the roller bracket is horizontal movement on the base. The roller bracket is fixed to the base through a fixing device.

[0012] The base also includes multiple ribs, two of which form a group, and multiple groups of ribs are evenly distributed along the length direction of the base, and each group of ribs is symmetrically distributed along the vertical center line of the base; the top of the rib is vertically connected to the bottom of the upper support plate, the end of the rib close to the inside of the base is vertically connected to the vertical plate, and the bottom of the rib is vertically connected to the top of the lower support plate; the side of the rib close to the outside of the base tends to be larger at the top and smaller at the bottom.

[0013] Two support blocks are provided at the bottom of the lower support plate. The support blocks are close to the outer side of the lower support plate. Block fixing holes passing through the support blocks are provided on the support blocks. The same lower bolt passes through the lower fixing hole and the block fixing hole.

[0014] A left fixing hole and a right fixing hole are provided at the top of both sides of the slewing support ring, a base groove is provided at the bottom of the slewing support ring, and two bottom fixing holes are provided at the bottom of the base groove; a side fixing hole is provided on one side of the bottom of the slewing support ring.

[0015] The left fixing hole is a through hole opening from the outside of the swivel support ring toward the center of the swivel support ring, the diameter of the left fixing hole at one end close to the outside of the swivel support ring is larger than the diameter of the left fixing hole at one end close to the inside of the swivel support ring, a left bolt is screwed into the left fixing hole, the end of the left bolt passing through the left fixing hole and exposed inside the swivel support ring is connected to the side wall of the upper support plate, and a left nut is screwed on the end of the left bolt passing through the left fixing hole and exposed inside the swivel support ring;

[0016] The right fixing hole is a through hole opening from the outside of the slewing support ring toward the center of the slewing support ring. The diameter of the end of the right fixing hole close to the outside of the slewing support ring is larger than the diameter of the end of the right fixing hole close to the inside of the slewing support ring. A right bolt is screwed into the right fixing hole. The end of the right bolt exposed to the inside of the slewing support ring passes through the right fixing hole and is connected to the side wall of the upper support plate. A right nut is screwed on the end of the right bolt exposed to the inside of the slewing center ring passes through the right fixing hole.

[0017] The lower support plate extends into the base groove, the bottom fixing hole is arranged corresponding to the lower fixing hole, the bottom fixing hole is a countersunk hole with a one-way opening toward the top of the base groove, and the same lower bolt passes through the lower fixing hole and is screwed into the bottom fixing hole;

[0018] The side fixing hole is a through hole opening from the outside of the swivel support ring toward the base groove. The diameter of the side fixing hole at one end close to the outside of the swivel support ring is larger than the diameter of the side fixing hole at one end close to the inside of the swivel support ring. A side bolt is screwed into the side fixing hole, and the side bolt extends into one side of the base groove and is connected to the side wall of the lower support plate.

[0019] A support shaft is provided on the roller along the axis direction of the roller. The support shaft extends from both sides of the roller. The diameter of the support shaft is smaller than the diameter of the roller.

[0020] The roller bracket includes a roller mounting groove and a bracket seat, the roller mounting groove is located on the bracket seat; the roller mounting groove also includes a groove front wall, a groove side wall and a groove rear wall vertically connected in sequence, the groove front wall and the groove rear wall are arranged correspondingly, the groove front wall and the groove rear wall have the same structure, the top of the groove front wall is provided with a support groove and a pressure cover, the pressure cover is located on both sides of the support groove, and the inner surface of the support groove is connected to the outer surface of the support shaft;

[0021] The fixing device comprises a bracket fixing hole and a T-shaped screw; the bracket fixing hole is located on both sides of the roller mounting groove, the four bracket fixing holes are symmetrically arranged along the center of the support shaft, the bracket fixing hole is a through-hole, a T-shaped screw is screwed into the bracket fixing hole, the bolt head of the T-shaped screw is located below the bracket fixing hole, the bolt body of the T-shaped screw is connected to the bracket fixing hole, the bolt body is connected to the bracket nut on the exposed part through the bracket fixing hole, and a fixing block is also provided at the bottom of the bracket seat.

[0022] The base is provided with an open groove, the open groove is a groove that opens in one direction toward the roller bracket, a lead screw is transversely arranged in the open groove, and a sliding groove is respectively provided on both sides of the open groove along the length direction of the base, the sliding groove is a groove that opens in one direction toward the top of the base, and the bolt head extends into the sliding groove;

[0023] A screw hole is respectively provided on the left and right walls of the base. The screw holes have the same structure. The screw holes are through-holes. Both ends of the screw pass through the screw holes. A bearing seat is further provided outside the screw hole. A bearing hole is provided on the bearing seat. The bearing hole is a through-hole. Both ends of the screw pass through the screw hole and the bearing hole in sequence to reach the outside of the base.

[0024] The lead screw passes through the fixing block and is connected to the fixing block.

[0025] Two screw support frames are also provided in the base, with a gap between adjacent screw support frames, one end of the screw support frame is vertically connected to the screw, and the other end of the screw support frame is vertically connected to the bottom wall of the base.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention relates to a rotary indexing tool for a slender workpiece with a partial arc in cross section, wherein the tool comprises a base, a rotary support ring and a roller bracket; the base comprises an upper support plate, a vertical plate and a lower support plate vertically connected in sequence; the upper support plate is provided with a workpiece slot, and both ends of the workpiece slot are respectively provided with an external fixing hole and an internal fixing hole, an external bolt is screwed in the external fixing hole, the top of the external bolt is vertically connected to a flat pressure plate, a flat pressure hole is provided on the flat pressure plate, and the same internal bolt passes through the flat pressure hole and is screwed into the internal fixing hole; the bottom of the lower support plate is provided with two lower fixing holes, and the lower fixing holes are screwed with lower bolts; the rotary support ring is wrapped around the outside of the base and connected to the base; the multiple roller brackets The center line is in a straight line and parallel to the center line of the slewing support ring. The roller bracket includes two rollers and a base. The outer surfaces of the multiple rollers are connected to the outer surface of the slewing support ring. The rollers are connected to the base through roller brackets. The roller brackets move laterally or are fixed on the base. When used, first place the base into the slewing support ring, then fix the tops on both sides of the base to the tops of the slewing support ring, and then fix the bottom of the base to the bottom of the slewing support ring. Then place multiple roller brackets on the ground platform. The center lines of the multiple roller brackets are in a straight line. Then place the aforementioned assembled base and slewing support ring on the roller bracket, connect the outer surface of the slewing support ring to the outer surface of the roller, and then One end is connected to the CNC indexing table, and then the CNC indexing table is used to adjust the theoretical installation axis of the workpiece of the tooling to make it coaxial with the rotation center of the indexing chuck of the CNC indexing table, and then the roller bracket is fixed to the floor surface, and then the distance between the two rollers on the same roller bracket is adjusted, and then the roller is fixed to the roller bracket, and then the CNC indexing table is started for trial operation, and then the workpiece is hoisted on the tooling, and then the workpiece is adjusted to the theoretical installation position, and then the outer bolts are screwed into the outer fixing holes in sequence, and then the end of the flattening plate away from the flattening hole is placed on the top surface of the outer bolt, and the end of the flattening plate close to the flattening hole is placed on the workpiece, and the position of the outer bolt is adjusted to make the flattening plate in a horizontal state, and then the inner bolts are screwed into the inner fixing holes through the flattening holes in sequence In the fixed hole, the flat plate is pressed to press the workpiece for processing, and the flat plate is in a horizontal state. Then the circular runout and axial runout of the workpiece are checked to ensure that they meet the standards. Then the CNC spray melting equipment can be used to spray melt the top of the workpiece. The CNC indexing table can adjust the base angle to complete the indexing process. The base uses internal bolts, external bolts and the flat plate to press and fix the workpiece, which will not damage the workpiece and has a good fixing effect. The length of the base and the rotary support ring are much greater than the width, so they can support slender workpieces. Compared with the existing technology that only provides support at both ends of the tooling, using multiple roller brackets to provide support in the middle of the rotary support ring can better prevent the workpiece from sagging due to gravity, which is more conducive to processing. Therefore, the present invention has a good processing effect.

[0028] 2. In a rotary indexing fixture for a slender workpiece with a partial circular arc in the cross section of the present invention, the base further comprises a plurality of ribs, two ribs symmetrically distributed along the vertical center line of the base form a group, and the plurality of ribs are evenly distributed along the length direction of the base; the ribs are vertically connected to the upper support plate, the vertical plate and the lower support plate; the side of the rib close to the outside of the base presents a trend of being larger at the top and smaller at the bottom; two support blocks are provided at the bottom of the lower support plate, and the support blocks are provided with block fixing holes that pass through the support blocks, and the same lower bolt passes through the lower fixing hole and the block fixing hole. When used, the ribs are connected to the upper support plate, the vertical plate and the lower support plate by welding. The lower support plate increases the overall rigidity of the base and provides better support for the workpiece. Since the gap in the middle of the slewing support ring is larger at the top and smaller at the bottom, the rib plate is also designed to be larger at the top and smaller at the bottom, which can reduce the diameter of the slewing support ring, not only reducing the weight of the slewing support ring but also saving materials. The addition of a support block component ensures that the positioning support position of the base assembly itself during processing is consistent with the positioning support position when the base is used to process the workpiece, avoiding inconsistent deflection caused by inconsistent support and preventing the lower support plate from being accidentally processed during base processing, which would affect the overall rigidity of the tooling. Therefore, the present invention has excellent support effect and saves materials.

[0029] 3. In a rotary indexing fixture for a slender workpiece with a partial arc cross section according to the present invention, a left fixing hole and a right fixing hole are provided at the top of both sides of the rotary support ring, a base groove is provided at the bottom of the rotary support ring, and two bottom fixing holes are provided at the bottom of the base groove; a side fixing hole is provided on one side of the bottom of the rotary support ring; a left bolt is screwed into the left fixing hole, and the exposed end of the left bolt is connected to the upper support plate, and a left nut is screwed between the left bolt and the upper support plate; the right fixing A right bolt is screwed into the hole, and the end of the right bolt exposed to the outside is connected to the upper support plate, and a right nut is screwed between the right bolt and the upper support plate; the lower support plate extends into the base groove, and the same lower bolt passes through the lower fixing hole and is screwed into the bottom fixing hole; a side bolt is screwed into the side fixing hole, and the side bolt extends into one side of the base groove and is connected to the lower support plate. When used, first hoist the base into the slewing support ring, and then screw the side bolt into the side fixing hole until the end of the side bolt exposed to the outside is connected to the lower support plate, and the side The bolt and the side wall of the base groove away from the side bolts support the lower support plate from both sides of the lower support plate to fix the lower support plate, and the side bolts leave a gap between the base groove and the lower support plate on the side of the side bolts, so that the coaxiality between the swivel support ring can be better ensured; then the lower bolts are passed through the lower fixing holes in sequence and screwed into the bottom fixing holes until the lower fixing holes are all filled with the lower bolts, and the lower bolts fix the lower support plate to the bottom wall of the base groove; then the left bolt is screwed into the left fixing hole to connect with the upper support plate, and then the left nut is fixed, and then the right bolt is screwed into the right fixing hole to connect with the upper support plate, and then the right nut is fixed, and the left bolt and the right bolt are clamped and fixed to the upper support plate from both sides of the upper support plate, and the left nut and the right nut can fix or loosen the positions of the left bolt and the right bolt, and when fixing, the left bolt and the right bolt are prevented from moving from the left fixing hole and the right fixing hole to the outside of the swivel support ring, thereby causing the base position to move, and when loosening, the position of the base can be fine-tuned to achieve a better clamping effect; therefore, the coaxiality between the components of the present invention is high.

[0030] 4. The rotary indexing tool of the present invention is a slender workpiece with a partial arc cross-section, wherein the roller is provided with a support shaft, and the support shaft extends from both sides of the roller; the roller bracket includes a roller mounting groove and a bracket seat, and the roller mounting groove also includes a groove front wall and a groove rear wall, and the groove front wall and the groove rear wall are correspondingly arranged and have the same structure, the groove front wall is provided with a support groove and a pressure cover at the top, and the pressure cover is located on both sides of the support groove, and the support shaft is arranged in the support groove; the bracket seat is provided with two bracket fixing holes at the parts on both sides of the roller mounting groove, the bracket fixing holes are screwed with T-shaped screws, the bolt heads of the T-shaped screws are located below the bracket fixing holes, the bolt bodies of the T-shaped screws are connected with the bracket fixing holes, and the bolt bodies are connected with the bracket nut on the exposed parts, and the bottom of the bracket seat is also provided with a fixing block; the base is provided with an open groove, a lead screw is provided in the open groove, and a sliding groove is provided on both sides of the open groove along the length direction of the base. The bolt head extends into the sliding groove; a screw hole is respectively provided on the left and right walls of the base, and both ends of the screw pass through the screw hole. A bearing seat is also provided outside the screw hole, and a bearing hole is provided on the bearing seat. Both ends of the screw pass through the screw hole and the bearing hole to reach the outside of the base; the screw is fixedly connected to the fixed block; two screw support brackets are also provided in the base, and the screw support brackets are vertically connected to the screw. When used, the roller bracket is first installed and fixed on the ground platform, and then all the bracket nuts are loosened so that the adjustment roller bracket can move laterally on the base, and then one end of the screw is turned to rotate the screw to drive the fixed block to move axially. The fixed block drives the roller bracket to move, and the roller bracket can move toward the center of the roller bracket or away from the center of the roller bracket at the same time. After the roller bracket reaches the appropriate position, the bearing seat is used to fix the screw to prevent the screw from continuing to rotate, and then all the bracket nuts are tightened to fix the roller bracket. Only the screw needs to be turned to adjust the position of the two roller brackets at the same time. Therefore, the present invention is convenient for adjusting the roller position. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a front view of the present invention.

[0033] Figure 3 yes Figure 1 Front view of the center base.

[0034] Figure 4 yes Figure 1 Schematic diagram of the front structure of the middle base.

[0035] Figure 5 yes Figure 1 Schematic diagram of the reverse structure of the middle base.

[0036] Figure 6 yes Figure 1 Schematic diagram of the structure of the central slewing support ring.

[0037] Figure 7 yes Figure 1 Cross-section of the mid-slewing support ring.

[0038] Figure 8 yes Figure 1 Front view of the middle slewing support ring.

[0039] Figure 9 yes Figure 1 Schematic diagram of the structure of the middle roller bracket.

[0040] Figure 10 yes Figure 1 Cross-section of the middle roller bracket.

[0041] Figure 11 yes Figure 1 Left side view of the middle roller bracket.

[0042] Figure 12 yes Figure 2 Front view of the machined workpiece.

[0043] In the figure: base 1, slewing support ring 2, left fixing hole 21, left bolt 211, left nut 212, right fixing hole 22, right bolt 221, right nut 222, base groove 23, bottom fixing hole 24, side fixing hole 25, side bolt 251, roller bracket 3, upper support plate 4, workpiece groove 41, outer fixing hole 42, inner fixing hole 43, outer bolt 44, flat pressure plate 45, flat pressure hole 46, inner bolt 47, vertical plate 5, lower support plate 6, lower fixing hole 61, lower bolt 62, support block 63, block fixing Fixed hole 64, roller 7, support shaft 71, base 8, opening groove 81, sliding groove 82, left side wall 83, right side wall 84, screw hole 85, bearing seat 86, bearing hole 87, screw support frame 88, roller bracket 9, roller mounting groove 91, groove front wall 911, groove side wall 912, groove rear wall 913, support groove 914, pressure cover 915, bracket seat 92, bracket fixing hole 921, T-screw 922, bracket nut 923, fixing block 93, fixing device 10, rib plate 11, screw 12. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] See Figure 1 — Figure 12 A rotary indexing fixture for a slender workpiece with a partial arc cross section, the fixture comprising a base 1, a rotary support ring 2 and a roller bracket 3;

[0046] The base 1 includes an upper support plate 4, a vertical plate 5 and a lower support plate 6; the middle part of the upper support plate 4 is vertically connected to one end of the two vertical plates 5, and the other end of the two vertical plates 5 is vertically connected to the middle of the lower support plate 6; a workpiece groove 41 is provided on the upper support plate 4 near the center line, and the workpiece groove 41 is a groove with a one-way opening above the upper support plate 4, and an external fixing hole 42 and an internal fixing hole 43 are respectively provided at both ends of the workpiece groove 41, the external fixing hole 42 is located on the outer side of the upper support plate 4, and the internal fixing hole 43 is located on the outer side of the upper support plate 4. Between the external fixing hole 42 and the workpiece slot 41; an external bolt 44 is screwed into the external fixing hole 42, and a flat pressing plate 45 is vertically connected to the top of the external bolt 44. A flat pressing hole 46 is provided on the flat pressing plate 45 corresponding to the internal fixing hole 43, and the same internal bolt 47 passes through the flat pressing hole 46 and is screwed into the internal fixing hole 43; two lower fixing holes 61 are provided at the bottom of the lower support plate 6, and the two lower fixing holes 61 are symmetrically distributed along the center of the lower support plate 6. The lower fixing hole 61 is a through hole, and a lower bolt 62 is screwed into the lower fixing hole 61;

[0047] The slewing support ring 2 is a semicircular ring, which is wrapped around the outside of the base 1. The tops of both sides of the slewing support ring 2 are connected to the upper support plate 4, and the bottom of the slewing support ring 2 is connected to the lower support plate 6;

[0048] The center lines of the multiple roller brackets 3 are parallel to the center line of the slewing support ring 2. The roller bracket 3 includes two rollers 7 and a base 8. The outer surfaces of the multiple rollers 7 are connected to the outer surface of the slewing support ring 2. The rollers 7 are connected to the base 8 through roller brackets 9. The movement stroke of the roller bracket 9 is horizontal movement on the base 8. The roller bracket 9 is fixed to the base 8 through a fixing device 10.

[0049] The base 1 also includes a plurality of ribs 11, wherein two ribs 11 form a group, and the plurality of groups of ribs 11 are evenly distributed along the length direction of the base 1, and each group of ribs 11 is symmetrically distributed along the vertical center line of the base 1; the top of the rib 11 is vertically connected to the bottom of the upper support plate 4, the end of the rib 11 close to the inside of the base 1 is vertically connected to the vertical plate 5, and the bottom of the rib 11 is vertically connected to the top of the lower support plate 6; the side of the rib 11 close to the outside of the base 1 presents a trend of being larger at the top and smaller at the bottom.

[0050] Two support blocks 63 are provided at the bottom of the lower support plate 6 , and the support blocks 63 are close to the outer side of the lower support plate 6 . Block fixing holes 64 passing through the support blocks are provided on the support blocks 63 , and the same lower bolt 62 passes through the lower fixing hole 61 and the block fixing hole 64 .

[0051] A left fixing hole 21 and a right fixing hole 22 are provided at the top of both sides of the slewing support ring 2, a base groove 23 is provided at the bottom of the slewing support ring 2, and two bottom fixing holes 24 are provided at the bottom of the base groove 23; a side fixing hole 25 is provided on one side of the bottom of the slewing support ring 2.

[0052] The left fixing hole 21 is a through hole opening from the outside of the slewing support ring 2 toward the center of the slewing support ring 2. The diameter of the end of the left fixing hole 21 close to the outside of the slewing support ring 2 is larger than the diameter of the end of the left fixing hole 21 close to the inside of the slewing support ring 2. A left bolt 211 is screwed into the left fixing hole 21. The end of the left bolt 211 that passes through the left fixing hole 21 and is exposed to the inside of the slewing support ring 2 is connected to the side wall of the upper support plate 4. A left nut 212 is screwed on the end of the left bolt 211 that passes through the left fixing hole 21 and is exposed to the inside of the slewing support ring 2.

[0053] The right fixing hole 22 is a through hole opening from the outside of the slewing support ring 2 toward the center of the slewing support ring 2. The diameter of the end of the right fixing hole 22 close to the outside of the slewing support ring 2 is larger than the diameter of the end of the right fixing hole 22 close to the inside of the slewing support ring 2. A right bolt 221 is screwed into the right fixing hole 22. The end of the right bolt 221 that passes through the right fixing hole 22 and is exposed to the inside of the slewing support ring 2 is connected to the side wall of the upper support plate 4. A right nut 222 is screwed on the end of the right bolt 221 that passes through the right fixing hole 22 and is exposed to the inside of the slewing support ring 2.

[0054] The lower support plate 6 extends into the base groove 23, and the bottom fixing hole 24 is provided corresponding to the lower fixing hole 61. The bottom fixing hole 24 is a countersunk hole with a one-way opening toward the top of the base groove 23. The same lower bolt 62 passes through the lower fixing hole 61 and is screwed into the bottom fixing hole 24;

[0055] The side fixing hole 25 is a through hole that opens from the outside of the slewing support ring 2 toward the base groove 23. The diameter of the side fixing hole 25 at one end close to the outside of the slewing support ring 2 is larger than the diameter of the side fixing hole 25 at one end close to the inside of the slewing support ring 2. A side bolt 251 is screwed into the side fixing hole 25, and the side bolt 251 extends into one side of the base groove 23 and is connected to the side wall of the lower support plate 6.

[0056] A support shaft 71 is provided on the roller 7 along the axis direction of the roller 7 . The support shaft 71 extends from both sides of the roller 7 . The diameter of the support shaft 71 is smaller than the diameter of the roller 7 .

[0057] The roller bracket 9 includes a roller mounting groove 91 and a bracket seat 92, wherein the roller mounting groove 91 is located on the bracket seat 92; the roller mounting groove 91 also includes a groove front wall 911, a groove side wall 912 and a groove rear wall 913 which are vertically connected in sequence, wherein the groove front wall 911 and the groove rear wall 913 are arranged correspondingly, and the groove front wall 911 and the groove rear wall 913 have the same structure, and a support groove 914 and a pressure cover 915 are provided on the top of the groove front wall 911, wherein the pressure cover 915 is located on both sides of the support groove 914, and the inner surface of the support groove 914 is connected to the outer surface of the support shaft 71;

[0058] The fixing device 10 consists of a bracket fixing hole 921 and a T-shaped screw 922; the bracket fixing hole 921 is located on both sides of the roller mounting groove 91, and the four bracket fixing holes 921 are symmetrically arranged along the center of the support shaft 71. The bracket fixing hole 921 is a through hole, and a T-shaped screw 922 is screwed into the bracket fixing hole 921. The bolt head of the T-shaped screw 922 is located below the bracket fixing hole 921, and the bolt body of the T-shaped screw 922 is connected to the bracket fixing hole 921. The bolt body passes through the bracket fixing hole 921 and is connected to a bracket nut 923 on the exposed part. A fixing block 93 is also provided at the bottom of the bracket seat 92.

[0059] The base 8 is provided with an open groove 81, which is a groove that opens in one direction toward the roller bracket 9. A lead screw 12 is transversely arranged in the open groove 81. A sliding groove 82 is provided on both sides of the open groove 81 along the length direction of the base 8. The sliding groove 82 is a groove that opens in one direction toward the top of the base 8, and the bolt head extends into the sliding groove 82.

[0060] A screw hole 85 is provided on the left side wall 83 and the right side wall 84 of the base 8, respectively. The screw holes 85 have the same structure. The screw holes 85 are through-holes. The two ends of the screw 12 pass through the screw holes 85. A bearing seat 86 is further provided on the outside of the screw hole 85. The bearing seat 86 is provided with a bearing hole 87. The bearing hole 87 is a through-hole. The two ends of the screw 12 pass through the screw hole 85 and the bearing hole 87 in sequence to reach the outside of the base 8.

[0061] The lead screw 12 passes through the fixing block 93 , and the lead screw 12 is connected to the fixing block 93 .

[0062] Two screw support frames 88 are also provided in the base 8 , with a gap between adjacent screw support frames 88 , one end of the screw support frame 88 is vertically connected to the screw 12 , and the other end of the screw support frame 88 is vertically connected to the bottom wall of the base 8 .

[0063] The supplementary description of the present invention is as follows:

[0064] The indexing of the present invention means that a chuck with an indexing and positioning function is first used to fix the shaft part, then a center frame or a bracket is used to support the shaft part, and then the chuck is used to rotate the shaft part to complete the indexing.

[0065] The purpose of the present invention is to realize the indexing of the processed workpiece and perform full-length spray melting construction on the processed workpiece at the same time.

[0066] The manufacturing scheme of the present invention is as follows: first, a base 1 is welded to support a workpiece with a large radius, and then a workpiece groove 41, the installation position of the slewing support ring 2, and the transition reference of the slewing axis at both ends are milled on the base 1. Then, multiple roller brackets 3 are welded, and the roller brackets 3 are processed after overall annealing to eliminate stress. Then, four dedicated slewing support rings 2 are processed. In order to ensure that the spraying gun does not interfere during the spraying construction, the slewing support ring 2 adopts a non-circular structure. The blank of the slewing support ring 2 is cast to improve the rigidity of the slewing support ring 2. Then, four roller brackets 3 of the same specification are used to support the base 1. The roller bracket 3 can adjust the axis height to achieve the same height as the chuck (the power end of the indexing). Then, a set of CNC indexing table (positioner) that can realize the rotation function is configured. The CNC indexing table is a general-purpose equipment that can be locked after indexing. The specifications can meet the working conditions and there are no special requirements. After the above equipment is configured, the rotation indexing of the workpiece can be realized, and the present invention is a complete set of tooling solutions, which can realize the rotation indexing of slender parts with partial arcs in cross-section.

[0067] Example 1:

[0068] See Figure 1 — Figure 12, a rotary indexing tool for a slender workpiece with a local arc cross-section, the tooling comprises a base 1, a rotary support ring 2 and a roller bracket 3; the base 1 comprises an upper support plate 4, a vertical plate 5 and a lower support plate 6; the middle part of the upper support plate 4 is vertically connected to one end of the two vertical plates 5, and the other end of the two vertical plates 5 is vertically connected to the middle of the lower support plate 6; a workpiece slot 41 is provided on the upper support plate 4 near the center line, and the workpiece slot 41 is a groove with a one-way opening above the upper support plate 4, and the two ends of the workpiece slot 41 are respectively provided with an external fixing hole 42 and an internal fixing hole 43, and the external fixing hole 42 is located at the outer position of the upper support plate 4, and the internal fixing hole 43 is located between the external fixing hole 42 and the workpiece slot 41; an external bolt 44 is screwed into the external fixing hole 42, and a flat pressing plate 45 is vertically connected to the top of the external bolt 44, and a flat pressing hole 46 is provided on the flat pressing plate 45 corresponding to the internal fixing hole 43, An inner bolt 47 passes through the flat pressure hole 46 and is screwed into the inner fixing hole 43; two lower fixing holes 61 are provided at the bottom of the lower support plate 6, and the two lower fixing holes 61 are symmetrically distributed along the center of the lower support plate 6. The lower fixing holes 61 are through-holes, and lower bolts 62 are screwed into the lower fixing holes 61; the slewing support ring 2 is a semicircular ring, and the slewing support ring 2 is wrapped around the outside of the base 1. The tops of both sides of the slewing support ring 2 are connected to the upper support plate 4, and the bottom of the slewing support ring 2 is connected to the lower support plate 6; the center lines of the multiple roller brackets 3 are parallel to the center line of the slewing support ring 2, and the roller bracket 3 includes two rollers 7 and a base 8. The outer surfaces of the multiple rollers 7 are connected to the outer surface of the slewing support ring 2, and the roller 7 is connected to the base 8 through a roller bracket 9. The movement stroke of the roller bracket 9 is to move laterally on the base 8, and the roller bracket 9 is fixed to the base 8 by a fixing device 10.

[0069] The present invention is particularly suitable for indexing, positioning and processing of elongated parts with irregular cross-sections, e.g. Figure 12 The cross-section of the slender workpiece shown has a partial arc. The workpiece is longer than 8 meters and weighs about 1 ton. The top cross-section of the workpiece contains an 80° partial arc, and the bottom of the workpiece is a flat structure with a groove. The workpiece needs to undergo full-length surface strengthening treatment (spray melting) on ​​the top arc. During the strengthening treatment process, the workpiece needs to undergo a rotary indexing process, that is, the angle of the spray melting equipment remains stationary while the workpiece rotates. When spraying the arc of the workpiece, the surface strengthening layer must not be discontinuous in the middle (no seams are generated, and each pass needs to be sprayed along the entire length).

[0070] When in use, first fix the top of the base 1 to the inner surface of the top of the slewing support ring 2, and then fix the bottom of the base 1 to the bottom of the inner side of the slewing support ring 2, and then line up multiple roller brackets 3, place the assembled base 1 and slewing support ring 2 on the roller bracket 3, connect the outer surface of the slewing support ring 2 to the outer surface of the roller 7, and then connect one end of the base 1 to the CNC indexing table, and then use the CNC indexing table to adjust the workpiece installation axis of the tooling so that it is coaxial with the rotation center of the indexing chuck of the CNC indexing table, and then fix all the roller brackets 3 to the floor surface in turn, and then make the distance between the two rollers 7 on the same roller bracket 3 appropriate, and then fix the position of the roller 7, and then start the CNC indexing table to Trial run. After the trial run is completed, the workpiece is hoisted and placed in the workpiece slot 41, and the workpiece is adjusted to the theoretical installation position. Then, the outer bolts 44 are screwed into all the outer fixing holes 42 in turn, and then the flattening plate 45 is connected to the top of all the outer bolts 44 in turn, so that the end of the flattening plate 45 close to the flattening hole 46 is placed on the top of the workpiece, so that the flattening plate 45 remains horizontal. Then, all the inner bolts 47 are screwed into the inner fixing holes 43 through the flattening holes 46 in turn, so that the flattening plate 45 presses the workpiece tightly; then check the circular runout and axial runout of the workpiece to ensure that they meet the requirements; then use the CNC indexing table to adjust the angle of the base 1 to complete the indexing process, and turn on the spray melting equipment to spray melt the top of the workpiece.

[0071] Example 2:

[0072] The basic content is the same as Example 1, except that:

[0073] See Figure 1 — Figure 4 The base 1 also includes a plurality of ribs 11, the two ribs 11 forming a group, and the multiple groups of ribs 11 are evenly distributed along the length direction of the base 1, and each group of ribs 11 is symmetrically distributed along the vertical center line of the base 1; the top of the rib 11 is vertically connected to the bottom of the upper support plate 4, the end of the rib 11 close to the inside of the base 1 is vertically connected to the vertical plate 5, and the bottom of the rib 11 is vertically connected to the top of the lower support plate 6; the side of the rib 11 close to the outside of the base 1 presents a trend of being larger at the top and smaller at the bottom; two support blocks 63 are provided at the bottom of the lower support plate 6, the support block 63 is close to the outside of the lower support plate 6, and a block fixing hole 64 is provided on the support block 63 that passes through the support block, and the same lower bolt 62 passes through the lower fixing hole 61 and the block fixing hole 64.

[0074] When in use, the rib plate 11 vertically connects the upper support plate 4, the lower support plate 6 and the vertical plate 5, thereby increasing the rigidity of the base 1 and providing a better support effect for processing the workpiece; because the rotary support ring 2 is a circular ring, the gap inside it is larger at the top and smaller at the bottom, so the rib plate 11 is also designed to be larger at the top and smaller at the bottom, and in conjunction with the gap, the design diameter of the rotary support ring 2 can be reduced; two support blocks 63 are provided at the bottom of the lower support plate 6, so that the positioning support position of the base 1 during processing and when the base 1 is used to support the processed workpiece is consistent, thereby avoiding inconsistent deflection caused by inconsistent support.

[0075] Example 3:

[0076] The basic content is the same as Example 1, except that:

[0077] See Figure 1 — Figure 7, a left fixing hole 21 and a right fixing hole 22 are provided at the top of both sides of the slewing support ring 2, a base groove 23 is provided at the bottom of the slewing support ring 2, and two bottom fixing holes 24 are provided at the bottom of the base groove 23; a side fixing hole 25 is provided on one side of the bottom of the slewing support ring 2; the left fixing hole 21 is a through hole opening from the outside of the slewing support ring 2 toward the center of the slewing support ring 2, and the diameter of the end of the left fixing hole 21 close to the outside of the slewing support ring 2 is larger than the diameter of the left fixing hole 21 close to the slewing support ring 2, a left bolt 211 is screwed into the left fixing hole 21, and the end of the left bolt 211 exposed inside the slewing support ring 2 is connected to the side wall of the upper support plate 4. A left nut 212 is screwed on the end of the left bolt 211 exposed inside the slewing support ring 2 through the left fixing hole 21; the right fixing hole 22 is a through hole opening from the outside of the slewing support ring 2 toward the center of the slewing support ring 2, and the diameter of the end of the right fixing hole 22 close to the outside of the slewing support ring 2 is greater than The right fixing hole 22 is close to the diameter of one end of the interior of the slewing support ring 2, and a right bolt 221 is screwed into the right fixing hole 22. The end of the right bolt 221 exposed to the interior of the slewing support ring 2 passes through the right fixing hole 22 and is connected to the side wall of the upper support plate 4. The right bolt 221 passes through the right fixing hole 22 and is exposed to the interior of the slewing support ring 2. A right nut 222 is screwed on the end; the lower support plate 6 extends into the base groove 23, and the bottom fixing hole 24 is arranged corresponding to the lower fixing hole 61, and the bottom fixing hole 24 is facing The countersunk hole with a one-way opening above the base groove 23, the same lower bolt 62 passes through the lower fixing hole 61 and is screwed into the bottom fixing hole 24; the side fixing hole 25 is a through hole opening from the outside of the slewing support ring 2 toward the base groove 23, and the diameter of the end of the side fixing hole 25 close to the outside of the slewing support ring 2 is larger than the diameter of the end of the side fixing hole 25 close to the inside of the slewing support ring 2. A side bolt 251 is screwed into the side fixing hole 25, and the side bolt 251 extends into one side of the base groove 23 and is connected to the side wall of the lower support plate 6.

[0078] When in use, first hoist the base 1 into the slewing support ring 2, and then screw the side bolts 251 into the side fixing holes 25 in turn, so that the side bolts 251 and the base grooves 23 clamp the lower support plate 6 from both sides of the lower support plate 6. The side bolts 251 are set on one side of the lower support plate 6, that is, the position of the base 1 can only be adjusted from one side, so that the coaxiality between the bases 1 is better; then all the lower bolts 62 are passed through the lower fixing holes 61 in turn and screwed into the bottom fixing holes 24 to fix the lower support plate 6 and the bottom wall of the base groove 23; then screw the left bolt 211 into the left fixing hole 21 And connected to the upper support plate 4, then screw the right bolt 221 into the right fixing hole 22 and connect it to the upper support plate 4, so that the left bolt 211 and the right bolt 221 support the upper support plate 4 from both sides of the upper support plate 4 to fix the upper support plate 4; the left bolt 211 and the right bolt 221 are also respectively provided with a left nut 212 and a right nut 222, and the position of the base can be fine-tuned when the left nut 212 and the right nut 222 are loosened. When the left nut 212 and the right nut 222 are fixed, the position of the left bolt 211 and the right bolt 221 are fixed, thereby fixing the position of the base 1.

[0079] Example 4:

[0080] The basic content is the same as Example 1, except that:

[0081] See Figure 1 — Figure 11, a support shaft 71 is provided on the roller 7 along the axis direction of the roller 7, and the support shaft 71 extends from both sides of the roller 7, and the diameter of the support shaft 71 is smaller than the diameter of the roller 7; the roller bracket 9 includes a roller mounting groove 91 and a bracket seat 92, and the roller mounting groove 91 is located on the bracket seat 92; the roller mounting groove 91 also includes a groove front wall 911, a groove side wall 912 and a groove rear wall 913 vertically connected in sequence, the groove front wall 911 and the groove rear wall 913 are correspondingly arranged, and the groove front wall 911 and the groove rear wall 913 have the same structure, and a support groove 914 and a pressure cover 915 are provided on the top of the groove front wall 911, and the pressure cover 9 15 is located on both sides of the support groove 914, and the inner surface of the support groove 914 is connected to the outer surface of the support shaft 71; the fixing device 10 is a bracket fixing hole 921 and a T-shaped screw 922; the bracket fixing hole 921 is located on both sides of the roller mounting groove 91, and the four bracket fixing holes 921 are symmetrically arranged along the center of the support shaft 71. The bracket fixing hole 921 is a through hole, and a T-shaped screw 922 is screwed into the bracket fixing hole 921. The bolt head of the T-shaped screw 922 is located below the bracket fixing hole 921, and the bolt body of the T-shaped screw 922 is connected to the bracket fixing hole 921, and the bolt body passes through the bracket fixing hole 9 21 is connected to the exposed part of the bracket nut 923, and the bottom of the bracket seat 92 is also provided with a fixing block 93; the base 8 is provided with an open groove 81, the open groove 81 is a groove that opens in one direction toward the roller bracket 9, and a screw 12 is arranged horizontally in the open groove 81. A sliding groove 82 is provided on both sides of the open groove 81 along the length direction of the base 8, and the sliding groove 82 is a groove that opens in one direction toward the top of the base 8, and the bolt head extends into the sliding groove 82; a screw hole 85 is provided on the left side wall 83 and the right side wall 84 of the base 8, respectively. The screw hole 85 has the same structure and is a through hole. Through hole, both ends of the screw 12 pass through the screw hole 85, and a bearing seat 86 is also provided on the outside of the screw hole 85, and a bearing hole 87 is provided on the bearing seat 86. The bearing hole 87 is a through hole, and the two ends of the screw 12 pass through the screw hole 85 and the bearing hole 87 in sequence to reach the outside of the base 8; the screw 12 passes through the fixed block 93, and the screw 12 is connected to the fixed block 93; two screw support frames 88 are also provided in the base 8, and there is a gap between the adjacent screw support frames 88, one end of the screw support frame 88 is vertically connected to the screw 12, and the other end of the screw support frame 88 is vertically connected to the bottom wall of the base 8.

[0082] When in use, first fix the roller bracket 3 on the ground platform in turn, then loosen all the bracket nuts 923 so that the roller bracket 9 can move laterally on the base 8, and then turn one end of the screw 12 to drive the fixing block 93 to move axially to enable the roller bracket 9 to move axially. The roller bracket 9 can move toward the center of the base 8 or the outside of the base 8 at the same time. After the roller bracket 9 reaches the appropriate position, the roller bracket 9 is fixed; the two pressure covers 915 fix the support shaft 71 from both sides of the support shaft 71 to prevent the support shaft 71 from falling off; the screw support frame 88 provides a supporting effect for the screw 12 to prevent the screw 12 from deforming after long-term use, affecting the subsequent use of the tooling.

[0083] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A rotary indexing fixture for a slender workpiece with a partial arc cross section, characterized by: The tooling comprises a base (1), a rotary support ring (2) and a roller bracket (3); The base (1) comprises an upper support plate (4), a vertical plate (5) and a lower support plate (6); the middle portion of the upper support plate (4) is vertically connected to one end of the two vertical plates (5), and the other end of the two vertical plates (5) is vertically connected to the middle portion of the lower support plate (6); a workpiece groove (41) is provided on the upper support plate (4) at a position close to the center line, and the workpiece groove (41) is a groove with a one-way opening toward the upper side of the upper support plate (4); an external fixing hole (42) and an internal fixing hole (43) are respectively provided at both ends of the workpiece groove (41), the external fixing hole (42) is located on the outer side of the upper support plate (4), and the internal fixing hole (43) is located on the inner side of the upper support plate (4). Between the external fixing hole (42) and the workpiece groove (41); an external bolt (44) is screwed into the external fixing hole (42), and a flattening plate (45) is vertically connected to the top of the external bolt (44), and a flattening hole (46) is provided on the flattening plate (45) corresponding to the internal fixing hole (43), and the same internal bolt (47) passes through the flattening hole (46) and is screwed into the internal fixing hole (43); two lower fixing holes (61) are provided at the bottom of the lower support plate (6), and the two lower fixing holes (61) are symmetrically distributed along the center of the lower support plate (6), and the lower fixing hole (61) is a through hole, and a lower bolt (62) is screwed into the lower fixing hole (61); The slewing support ring (2) is a semicircular ring, and the slewing support ring (2) is wrapped around the outside of the base (1). The tops of both sides of the slewing support ring (2) are connected to the upper support plate (4), and the bottom of the slewing support ring (2) is connected to the lower support plate (6); The center lines of the plurality of roller brackets (3) are parallel to the center line of the rotary support ring (2); the roller brackets (3) include two rollers (7) and a base (8); the outer surfaces of the plurality of rollers (7) are connected to the outer surface of the rotary support ring (2); the rollers (7) are connected to the base (8) via roller brackets (9); the movement stroke of the roller brackets (9) is transverse movement on the base (8); the roller brackets (9) are fixed to the base (8) via fixing devices (10); A left fixing hole (21) and a right fixing hole (22) are provided at the tops of both sides of the slewing support ring (2); a base groove (23) is provided at the bottom of the slewing support ring (2); and two bottom fixing holes (24) are provided at the bottom of the base groove (23); and a side fixing hole (25) is provided on one side of the bottom of the slewing support ring (2); The left fixing hole (21) is a through hole opening from the outside of the slewing support ring (2) toward the center of the slewing support ring (2); the diameter of the end of the left fixing hole (21) close to the outside of the slewing support ring (2) is larger than the diameter of the end of the left fixing hole (21) close to the inside of the slewing support ring (2); a left bolt (211) is screwed into the left fixing hole (21); the end of the left bolt (211) exposed inside the slewing support ring (2) is connected to the side wall of the upper support plate (4); and a left nut (212) is screwed on the end of the left bolt (211) exposed inside the slewing support ring (2) through the left fixing hole (21); The right fixing hole (22) is a through hole opening from the outside of the slewing support ring (2) toward the center of the slewing support ring (2); the diameter of the end of the right fixing hole (22) close to the outside of the slewing support ring (2) is larger than the diameter of the end of the right fixing hole (22) close to the inside of the slewing support ring (2); a right bolt (221) is screwed into the right fixing hole (22); the end of the right bolt (221) exposed inside the slewing support ring (2) is connected to the side wall of the upper support plate (4); and a right nut (222) is screwed on the end of the right bolt (221) exposed inside the slewing support ring (2) through the right fixing hole (22).

2. The rotary indexing fixture for a slender workpiece with a partial arc cross section according to claim 1, characterized in that: The base (1) further comprises a plurality of ribs (11), two ribs (11) form a group, the plurality of groups of ribs (11) are evenly distributed along the length direction of the base (1), and each group of ribs (11) is symmetrically distributed along the vertical center line of the base (1); the top of the ribs (11) is vertically connected to the bottom of the upper support plate (4), the end of the ribs (11) close to the inside of the base (1) is vertically connected to the vertical plate (5), and the bottom of the ribs (11) is vertically connected to the top of the lower support plate (6); the side of the ribs (11) close to the outside of the base (1) presents a trend of being larger at the top and smaller at the bottom.

3. The rotary indexing fixture for a slender workpiece with a partial arc cross section according to claim 2, characterized in that: Two support blocks (63) are provided at the bottom of the lower support plate (6), and the support blocks (63) are close to the outer side of the lower support plate (6). The support blocks (63) are provided with block fixing holes (64) that pass through the support blocks, and the same lower bolt (62) passes through the lower fixing hole (61) and the block fixing hole (64).

4. The rotary indexing fixture for an elongated workpiece with a partial arc cross section according to claim 1, characterized in that: The lower support plate (6) extends into the base groove (23), the bottom fixing hole (24) is arranged corresponding to the lower fixing hole (61), the bottom fixing hole (24) is a countersunk hole with a one-way opening toward the top of the base groove (23), and the same lower bolt (62) passes through the lower fixing hole (61) and is screwed into the bottom fixing hole (24); The side fixing hole (25) is a through hole opening from the outside of the slewing support ring (2) toward the base groove (23); the diameter of one end of the side fixing hole (25) close to the outside of the slewing support ring (2) is larger than the diameter of one end of the side fixing hole (25) close to the inside of the slewing support ring (2); a side bolt (251) is screwed into the side fixing hole (25); the side bolt (251) extends into one side of the base groove (23) and is connected to the side wall of the lower support plate (6).

5. The rotary indexing fixture for a slender workpiece with a partial arc cross section according to claim 1, characterized in that: A support shaft (71) is provided on the roller (7) along the axis direction of the roller (7), and the support shaft (71) extends from both sides of the roller (7). The diameter of the support shaft (71) is smaller than the diameter of the roller (7).

6. The rotary indexing fixture for an elongated workpiece with a partial arc cross section according to claim 5, characterized in that: The roller bracket (9) includes a roller mounting groove (91) and a bracket seat (92), wherein the roller mounting groove (91) is located on the bracket seat (92); the roller mounting groove (91) also includes a groove front wall (911), a groove side wall (912) and a groove rear wall (913) which are vertically connected in sequence, wherein the groove front wall (911) and the groove rear wall (913) are arranged correspondingly, and the groove front wall (911) and the groove rear wall (913) have the same structure, and a support groove (914) and a pressure cover (915) are provided on the top of the groove front wall (911), wherein the pressure cover (915) is located on both sides of the support groove (914), and the inner surface of the support groove (914) is connected to the outer surface of the support shaft (71); The fixing device (10) comprises a bracket fixing hole (921) and a T-shaped screw (922); the bracket fixing hole (921) is located on both sides of the roller mounting groove (91), and the four bracket fixing holes (921) are symmetrically arranged along the center of the support shaft (71); the bracket fixing hole (921) is a through hole, and a T-shaped screw (922) is screwed into the bracket fixing hole (921); the bolt head of the T-shaped screw (922) is located below the bracket fixing hole (921), the bolt body of the T-shaped screw (922) is connected to the bracket fixing hole (921), and the portion of the bolt body exposed to the outside through the bracket fixing hole (921) is connected to a bracket nut (923), and a fixing block (93) is also provided at the bottom of the bracket seat (92).

7. The rotary indexing fixture for a slender workpiece with a partial arc cross section according to claim 6, characterized in that: The base (8) is provided with an open groove (81), the open groove (81) is a groove that opens in one direction toward the roller bracket (9), a lead screw (12) is transversely arranged in the open groove (81), and a sliding groove (82) is respectively provided on both sides of the open groove (81) along the length direction of the base (8), the sliding groove (82) is a groove that opens in one direction toward the top of the base (8), and the bolt head extends into the sliding groove (82); A screw hole (85) is provided on the left side wall (83) and the right side wall (84) of the base (8), respectively. The screw holes (85) have the same structure. The screw holes (85) are through-holes. The two ends of the screw (12) pass through the screw holes (85). A bearing seat (86) is provided outside the screw hole (85). The bearing seat (86) is provided with a bearing hole (87). The bearing hole (87) is a through-hole. The two ends of the screw (12) pass through the screw hole (85) and the bearing hole (87) in sequence to reach the outside of the base (8); The lead screw (12) passes through the fixed block (93), and the lead screw (12) is connected to the fixed block (93).

8. The rotary indexing fixture for an elongated workpiece with a partial arc cross section according to claim 7, characterized in that: Two screw support frames (88) are also provided in the base (8), with a gap between adjacent screw support frames (88), one end of the screw support frame (88) is vertically connected to the screw (12), and the other end of the screw support frame (88) is vertically connected to the bottom wall of the base (8).

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