Positioning tool for gear cylindrical grinding machine

Abstract

The positioning tool for the gear cylindrical grinding machine comprises an inner pipe, a fixing ring and a positioning column, the inner pipe, the fixing ring and the positioning column are coaxially arranged, one end of the positioning column is connected with a baffle ring, one end of the fixing ring is fixedly connected with one end of the baffle ring through the inner pipe, and a supporting pipe composed of three identical arc-shaped plates is arranged on the outer side of the inner pipe in a sleeved mode. One end of the arc-shaped plate is a necking end, the diameter of the other end of the arc-shaped plate is larger than that of the fixing ring, the necking end and the other end of the arc-shaped plate are slidably connected to one end face of the fixing ring and one end face of the baffle ring in the radial direction of the inner pipe, and a screw sleeved with the inner pipe is rotationally connected between the fixing ring and the positioning column; one end of the screw penetrates through the fixing ring and is fixedly connected with a rotating handle, the outer side of the screw is in threaded connection with a set of threaded rings, a plurality of first compression springs are connected between the arc-shaped plate and the inner pipe, the inner side of the arc-shaped plate is fixedly connected with a set of push plates, and first connecting rods are hinged between the push plates and the threaded rings; the other end of the fixing ring is detachably and fixedly connected with a butt joint sleeve; and the whole device has the advantages of high universality and low cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylindrical grinders, and more specifically relates to a positioning tool for gear cylindrical grinders. Background Art

[0002] Cylindrical grinding machine is a grinding machine for machining the outer surface of cylindrical, conical or other shapes of workpieces and the shoulder end surface. It is the most widely used of all grinding machines. Cylindrical grinding machine for gear machining is a kind of equipment that uses grinding method to machine the outer surface of gear. It has been widely used in the field of gear machining machinery. Figure 1 As shown, when the existing external cylindrical grinder positions the gear, it is necessary to first insert the positioning shaft 1 into the inner hole of the gear to satisfy the function of fixing the gear, and then the positioning shaft 1 with the inserted gear is connected and positioned at both ends of the shaft through two grinding machine tips 2, and then the bolt 4 on the side of one end of the positioning shaft 1 is driven by the rotating screw 3 of the grinder to rotate around the connecting line between the two grinding machine tips 2; however, because the sizes of the existing positioning shafts are fixed, the user needs to replace a positioning shaft of a different size every time a gear with a different inner diameter is processed, which has poor versatility and high processing costs. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a positioning fixture for a gear cylindrical grinder, which is suitable for gears with different inner hole diameters and has the advantages of high versatility and low cost.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A positioning fixture for a gear external cylindrical grinder, comprising a positioning column and a fixing ring, both of which are coaxially arranged, one end of the positioning column is connected to a retaining ring, one end of the fixing ring and one end of the retaining ring are coaxially fixedly connected with an inner tube, a support tube for supporting the inner hole wall of the gear is sleeved on the outer side of the inner tube, and the support tube is composed of three identical arc-shaped plates; one end of the arc-shaped plate is a constricted end, and the diameter of the other end is larger than the diameter of the fixing ring, and the constricted end and the other end of the arc-shaped plate are respectively slidably connected to one end face of the fixing ring and one end face of the retaining ring along the radial direction of the inner tube, A plurality of first compression springs are connected between the arc plate and the inner tube, a screw is rotatably connected between the fixing ring and the positioning column, and the screw is sleeved in the inner tube; one end of the screw passes through the fixing ring and is fixedly connected to a rotating handle, a group of threaded rings are connected to the external thread of the screw, a push plate is fixedly connected to the inner side of the arc plate, a first connecting rod is hinged between the push plate and the threaded ring, a limiting hole for the movement of the first connecting rod is opened in the inner tube, and a docking sleeve for docking with the top of the grinding machine is detachably and fixedly connected to the other end of the fixing ring.

[0006] Further configuration: the support tube is provided with several groups of expansion mechanisms for supporting the inner hole wall of the gear, the expansion mechanisms include a threaded sleeve, a second connecting rod located between adjacent first connecting rods and an elastic sleeve arranged in an inverted cone shape, the threaded sleeve is threadedly connected to the outer peripheral surface of the screw rod, three groups of second connecting rods are evenly distributed along the circumference of the threaded sleeve, the inner side of the elastic sleeve and the outer side of the threaded sleeve are hinged through the second connecting rod, one end of the elastic sleeve is fixed to the outer side surface of the inner tube, the three side surfaces of the other end of the elastic sleeve are provided with notches located between adjacent second connecting rods, three groups of second compression springs are connected between the inner side of the other end of the elastic sleeve and the inner tube, each group of the second compression springs is located on both sides of the second connecting rod on the same side, the inner tube is provided with a limiting through groove for the second connecting rod to rotate through and a group of makeshift grooves for the second compression springs to be placed, and a third compression spring is connected between adjacent second connecting rods in the same group.

[0007] It is further provided that: a wedge-shaped protrusion is fixedly arranged on the outer side surface of the elastic sleeve.

[0008] It is further configured that: a plurality of blocking plates for blocking the threaded ring are connected inside the inner tube, and the blocking plates are located between the two ends of the first connecting rod in the same group.

[0009] Further configuration: the retaining ring and the positioning column are integrally formed, one end face of the retaining ring and one end face of the fixing ring are provided with a middle slide groove arranged along the radial direction and side slide grooves located on both sides of the middle slide groove, the middle of the two end faces of the arc plate are connected with a T-shaped middle slider, the middle slider is slidably connected in the middle slide groove, the two end faces of the arc plate are connected with a T-shaped side slider on both sides, the side slider is slidably connected in the side slide groove.

[0010] It is further provided that the other end of the positioning column is connected with a handle for easy grasping, and both the handle and the docking sleeve are provided with a rotating groove for the grinding machine top to dock and rotate, and the rotating groove is arranged in a conical shape coaxial with the inner tube.

[0011] In summary, the utility model uses a fixing ring, a supporting tube, a shrinking end and a retaining ring to align the inner hole of the gear with the shrinking end, and moves the gear on the supporting tube until one end face of the gear abuts against one end face of the retaining ring, thereby playing a role in preliminary positioning of the gear; through a screw rod, a threaded ring, a rotating handle, a first connecting rod and a push plate, and the supporting tube is configured to be composed of three arc plates connected along the radial sliding connection of the inner tube, it is only necessary to manually rotate the rotating handle to drive the screw rod to rotate, thereby driving the threaded ring to move in a direction away from the retaining ring, and then driving the first connecting rod to rotate and push the corresponding push plate and the arc plate radially outward along the inner tube until all the arc plates respectively abut against the inner hole side walls of the gear, and then stop rotating the rotating screw rod to achieve alignment of different inner hole diameters. The function of preliminarily positioning and fixing gears with different inner hole diameters is to increase the supporting force of other positions of the arc plate on the inner hole of the gear through the first compression spring, so that the arc plate fits tightly with the side wall of the inner hole of the gear, avoiding the gear shaking and affecting the positioning and fixing effect of the tooling on gears with different inner hole diameters, thereby further positioning and fixing the gears and further improving the overall versatility; by setting the number of arc plates to three, the good stability of the triangle is utilized to further improve the supporting stability of the inner hole of the gear; the utility model does not need to replace tooling of different sizes back and forth, and only needs one tooling to achieve the positioning and fixing of gears with multiple different inner hole diameters, and the operation is simple and stable, with the advantages of high versatility and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall structural schematic diagram of the existing positioning structure;

[0013] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0014] Figure 3 A cross-sectional view of an embodiment of the utility model;

[0015] Figure 4 for Figure 3 A partial enlarged view of middle A;

[0016] Figure 5 An exploded view of an embodiment of the utility model;

[0017] Figure 6 It is a partial structural schematic diagram of an embodiment of the utility model;

[0018] Figure 7 for Figure 6 Sectional view along the section line AA.

[0019] In the figure: 1. positioning shaft; 2. top; 3. rotating screw; 4. bolt; 5. positioning column; 6. inner tube; 7. fixing ring; 8. retaining ring; 9. support tube; 10. arc plate; 11. constricted end; 12. screw; 13. rotating handle; 14. threaded ring; 15. first compression spring; 16. push plate; 17. first connecting rod; 18. limiting hole; 19. docking sleeve; 20. threaded sleeve; 21. second connecting rod; 22. elastic sleeve; 23. notch; 24. second compression spring; 25. limiting through groove; 26. giving way groove; 27. third compression spring; 28. wedge-shaped protrusion; 29. ​​blocking plate; 30. middle slide groove; 31. side slide groove; 32. middle slider; 33. side slider; 34. grip; 35. rotating groove. DETAILED DESCRIPTION

[0020] In order to explain the technical content, purpose and effect of the utility model in detail, the following is a description of the embodiments and the accompanying drawings. It should be noted that the words "upper" and "lower" used in the following description refer to the attached Figure 3 In the directions, the words "bottom" and "top" refer to the Figure 3 The direction towards the geometric center of a specific component.

[0021] The most critical concept of the utility model is that the gear is initially positioned by the fixing ring 7, the supporting tube 9, the constricted end 11 and the retaining ring 8; the screw 12, the threaded ring 14, the rotating handle 13, the first connecting rod 17 and the push plate 16, and the arc plate 10 is set to be radially slidingly connected along the inner tube 6, the rotating handle 13 is rotated, and the threaded ring 14 is driven to move away from the retaining ring 8 by the rotation of the screw 12, thereby driving the first connecting rod 17 to push the push plate 16 and the arc plate 10 radially outward along the inner tube 6 until all the arc plates 10 are against the inner hole side wall of the gear, and the rotation of the rotating screw 12 is stopped, so that the gears with different inner hole diameters can be positioned and fixed; the first compression spring 15 is used to increase the supporting force of the other positions of the arc plate 10 on the inner hole of the gear, so that the arc plate 10 is closely fitted with the inner hole side wall of the gear, thereby further improving the overall versatility; by setting the arc plate 10 to three, the good stability of the triangle is used to further improve the support stability of the inner hole of the gear;

[0022] The utility model does not need to replace tooling of different sizes back and forth, and only needs one tooling to realize the positioning and fixing of gears with various inner hole diameters, and the operation is simple and stable, and has the advantages of high versatility and low cost.

[0023] Please refer to Figures 2 to 7As shown, a positioning fixture for a gear external cylindrical grinder includes a positioning column 5 and a fixing ring 7 which are coaxially arranged. One end of the positioning column 5 is connected to a retaining ring 8. An inner tube 6 is coaxially fixedly connected between one end of the fixing ring 7 and one end of the retaining ring 8. A support tube 9 for supporting the inner hole wall of the gear is sleeved on the outer side of the inner tube 6. The support tube 9 is composed of three identical arc-shaped plates 10. One end of the arc-shaped plate 10 is a constricted end 11, and the diameter of the other end is larger than the diameter of the fixing ring 7. The constricted end 11 and the other end of the arc-shaped plate 10 are respectively slidably connected to one end face of the fixing ring 7 and one end face of the retaining ring 8 along the radial direction of the inner tube 6. A plurality of first compression springs 15 are connected between the plate 10 and the inner tube 6, a screw 12 is rotatably connected between the fixing ring 7 and the positioning column 5, and the screw 12 is sleeved in the inner tube 6; one end of the screw 12 passes through the fixing ring 7 and is fixedly connected to a rotating handle 13, a group of threaded rings 14 are connected to the external thread of the screw 12, a push plate 16 is fixedly connected to the inner side of the arc plate 10, a first connecting rod 17 is hinged between the push plate 16 and the threaded ring 14, the inner tube 6 is provided with a limiting hole 18 for the movement of the first connecting rod 17, and the other end of the fixing ring 7 is detachably and fixedly connected to a docking sleeve 19 for docking with the top of the grinding machine.

[0024] From the above description, it can be seen that when it is necessary to grind and position gears with different inner hole diameters, first, the docking sleeve 19 can be removed from the other end of the fixing ring 7, and then the inner hole of the gear is aligned with the constricted end 11 of the arc plate 10, and the gear is pushed toward the arc plate 10. The inner hole of the gear first passes through the fixing ring 7 and the constricted end 11 of the arc plate 10, until one end face of the gear abuts against one end face of the retaining ring 8. After that, the rotating handle 13 is manually rotated through the screw 12, the threaded ring 14, the rotating handle 13, the first connecting rod 17 and the push plate 16, and the screw 12 rotates, driving a group of threaded rings 14 to move in the direction away from the retaining ring 8, and each threaded ring 14 drives the same side The three first hinged connecting rods 17 rotate in the limiting holes 18 and respectively push the corresponding three push plates 16 radially outward along the inner tube 6, thereby driving the three arc plates 10 to move radially away from the inner tube 6 along the fixing ring 7, and the support tube 9 is opened until the three arc plates 10 respectively abut against the three side walls of the inner hole of the gear, and the rotation of the rotating handle 13 is stopped, and the docking sleeve 19 is re-fixed on the other end of the fixing ring 7, which plays a role in preliminary positioning and fixing of gears with different inner hole diameters. There is no need to replace tooling of different sizes back and forth, and only one tooling is needed to realize positioning and fixing of gears with multiple different inner hole diameters, with high overall versatility and low use cost;

[0025] In addition, during the movement of the arc plate 10, the first compression spring 15 is used, and under the elastic force of the first compression spring 15, the supporting force of the arc plate 10 at other positions except the push plate 16 on the inner hole of the gear is increased, so that the arc plate 10 is tightly fitted with the side wall of the inner hole of the gear, avoiding the gear shaking and affecting the positioning and fixing effect of the tooling on gears with different inner hole diameters, thereby further improving the overall versatility; by setting the arc plate 10 to three, the good stability of the triangle is utilized to further improve the supporting stability of the gear inner hole; and providing a tapered end 11 to facilitate the rapid insertion of the gear into the support tube 9.

[0026] Furthermore, the support tube 9 is provided with several groups of expansion mechanisms for supporting the inner hole wall of the gear, the expansion mechanisms include a threaded sleeve 20, a second connecting rod 21 located between adjacent first connecting rods 17 and an elastic sleeve 22 arranged in an inverted frustum shape, the threaded sleeve 20 is threadedly connected to the outer peripheral surface of the screw 12, three groups of second connecting rods 21 are evenly arranged along the circumference of the threaded sleeve 20, the inner side of the elastic sleeve 22 and the outer side of the threaded sleeve 20 are hinged through the second connecting rod 21, one end of the elastic sleeve 22 is fixed to the outer side surface of the inner tube 6, and the three side surfaces of the other end of the elastic sleeve 22 are provided with notches 23 located between adjacent second connecting rods 21, three groups of second compression springs 24 are connected between the inner side of the other end of the elastic sleeve 22 and the inner tube 6, each group of second compression springs 24 is located on both sides of the second connecting rod 21 on the same side, the inner tube 6 is provided with a limiting through groove 25 for the second connecting rod 21 to rotate through and a group of make way grooves 26 for the second compression springs 24 to be placed, and a third compression spring 27 is connected between the adjacent second connecting rods 21 of the same group.

[0027] As can be seen from the above description, during the rotation of the screw 12, the support tube 9 opens. Since the threaded sleeve 20 is also threadedly connected to the outer peripheral surface of the screw 12, under the limiting action of the limiting groove 25 and the second connecting rod 21, the rotation of the screw 12 drives the threaded sleeve 20 to move away from the retaining ring 8 along the length direction of the screw 12, thereby driving the three second connecting rods 21 to rotate in the limiting groove 25 and push the movable parts of the three elastic sleeves 22 between the adjacent notches 23 toward the inner hole wall of the gear. After the screw 12 stops rotating, the support tube 9 opens, and the third compression spring 2 Under the elastic force of 7, the first connecting rod 17 continues to drive the movable part of the elastic sleeve 22 to move until the elastic sleeve 22 is against the other three side walls of the gear inner hole, thereby further positioning and fixing the inner hole of the gear; because the second connecting rod 21 is located between adjacent first connecting rods 17, each notch 23 is provided between adjacent second connecting rods 21, it can be seen that the three side walls of the gear inner hole acted by the support plate and the other three side walls of the gear inner hole acted by the expansion mechanism are staggered with each other, ensuring the uniformity of the tooling supporting and fixing the inner hole wall of the gear, thereby further ensuring the fixing effect of the gear.

[0028] Furthermore, a wedge-shaped protrusion 28 is fixedly arranged on the outer side surface of the elastic sleeve 22 .

[0029] From the above description, it can be seen that through the setting of the wedge-shaped protrusion, because the elastic sleeve 22 is elastic, it ensures that the inner hole wall of the gear is not damaged, while further increasing the friction between the outer side surface of the elastic sleeve 22 and the inner hole of the gear, avoiding the gear from sliding, and playing a role in improving the supporting force of the expansion mechanism on the inner hole of the gear.

[0030] Furthermore, a plurality of blocking plates 29 for blocking the threaded ring 14 are connected to the inner tube 6 , and the blocking plates 29 are located between the two ends of the first connecting rod 17 of the same group.

[0031] From the above description, it can be seen that by setting a blocking plate 29 between the two ends of the first connecting rod 17, it is avoided that during the process of fixing the gear, the threaded ring 14 is rotated and moved to the angle between the two first connecting rods 17 in the same group exceeds 180°, which causes the push plate 16 and the arc plate 10 to reset toward the inner tube 6, causing the arc plate 10 to be unable to open and abut against the inner hole side wall of the gear, thereby ensuring the fixation of the gear by the arc plate 10 and the overall versatility.

[0032] Furthermore, the retaining ring 8 and the positioning column 5 are integrally formed, and one end face of the retaining ring 8 and one end face of the fixing ring 7 are provided with a radially arranged middle slide groove 30 and side slide grooves 31 located on both sides of the middle slide groove 30. The middle of the two end faces of the arc plate 10 are connected with a T-shaped middle slider 32, and the middle slider 32 is slidably connected in the middle slide groove 30. The two end faces of the arc plate 10 are connected with a T-shaped side slider 33 on both sides, and the side slider 33 is slidably connected in the side slide groove 31.

[0033] From the above description, it can be seen that by setting the retaining ring 8 and the positioning column 5 as an integral part, the connection stability between the retaining ring 8 and the positioning column 5 is improved, and by providing the middle slider 32 and the side slider 33 which are respectively slidably connected to the middle slide groove 30 and the side slide groove 31, it is avoided that the arc plate 10 shakes during the radial outward sliding process along the inner tube 6, thereby affecting the fixation of the gear, thereby further ensuring the stability of the radial sliding of the two arc plates 10 and improving the positioning and fixing effect of the gear.

[0034] Furthermore, the other end of the positioning column 5 is connected to a handle 34 for easy grasping. The handle 34 and the docking sleeve 19 are both provided with a rotating groove 35 for the grinding machine top to dock and rotate. The rotating groove 35 is arranged in a conical shape coaxial with the inner tube 6.

[0035] From the above description, it can be seen that by setting the handle 34, it is convenient to manually grasp the entire tooling. When the gear that needs to be processed and positioned is placed on the top of the grinder, the handle 34 and the rotating groove 35 of the docking sleeve 19 are used to facilitate the docking and rotation limiting of the two tops of the grinder.

[0036] Reference Figures 2 to 7 , the embodiments provided by the utility model are:

[0037] A positioning fixture for a gear external cylindrical grinder comprises a positioning column 5 and a fixing ring 7, the positioning column 5 and the fixing ring 7 are coaxially arranged, one end of the positioning column 5 is connected to a retaining ring 8, one end of the fixing ring 7 and one end of the retaining ring 8 are coaxially fixedly connected to an inner tube 6, the outer side of the inner tube 6 is sleeved with a support tube 9 for supporting the inner hole wall of the gear, and the support tube 9 is provided with a plurality of groups of expansion mechanisms for supporting the inner hole wall of the gear, and the other end of the fixing ring 7 is detachably fixedly connected with a docking sleeve 19 for docking with the top of the grinder, and the docking sleeve 19 of this embodiment is connected to the other end of the fixing ring 7 by bolts, and can also be snap-fitted or plug-in (not shown in the figure), and is not limited to these detachable methods, and other detachable methods that are convenient for quick disassembly and assembly of the docking sleeve 19 are all possible; the other end of the positioning column 5 is connected to a handle 34 for easy grasping, and the handle 34 and the docking sleeve 19 are both provided with a rotating groove 35 for docking and rotating with the top of the grinder, and the rotating groove 35 is conically arranged coaxially with the inner tube 6;

[0038] The retaining ring 8 is integrally formed with the positioning column 5. One end face of the retaining ring 8 and one end face of the fixing ring 7 are provided with a radially arranged middle slide groove 30 and side slide grooves 31 located on both sides of the middle slide groove 30. The middle of the two end faces of the arc plate 10 are connected with a T-shaped middle slider 32, and the middle slider 32 is slidably connected in the middle slide groove 30. The two end faces of the arc plate 10 are connected with a T-shaped side slider 33 on both sides, and the side slider 33 is slidably connected in the side slide groove 31.

[0039] The support tube 9 is composed of three identical arc plates 10; one end of the arc plate 10 is a constricted end 11, and the diameter of the other end is larger than the diameter of the fixing ring 7. The constricted end 11 and the other end of the arc plate 10 are respectively slidably connected to one end face of the fixing ring 7 and one end face of the retaining ring 8 along the radial direction of the inner tube 6. A plurality of first compression springs 15 are connected between the arc plate 10 and the inner tube 6. A push plate 16 is fixedly connected to the inner side of the arc plate 10. A screw 12 is rotatably connected between the fixing ring 7 and the positioning column 5, and the screw 12 is sleeved in the inner tube 6; one end of the screw 12 passes through the fixing ring 7 and is fixedly connected to a rotating handle 13. A group of threaded rings 14 are externally threadedly connected to the screw 12. A first connecting rod 17 is hinged between the push plate 16 and the threaded ring 14. The inner tube 6 is provided with a limiting hole 18 for the movement of the first connecting rod 17. A plurality of blocking plates 29 for blocking the threaded ring 14 are connected to the inner tube 6. The blocking plate 29 is located between the two ends of the first connecting rod 17 of the same group.

[0040] The expansion mechanism includes a threaded sleeve 20, a second connecting rod 21 located between adjacent first connecting rods 17, and an elastic sleeve 22 arranged in an inverted frustum cone shape. The threaded sleeve 20 is threadedly connected to the outer circumferential surface of the screw rod 12. Three groups of second connecting rods 21 are evenly arranged along the circumference of the threaded sleeve 20. The inner side of the elastic sleeve 22 and the outer side of the threaded sleeve 20 are hinged through the second connecting rod 21. One end of the elastic sleeve 22 is fixed to the outer side surface of the inner tube 6. The three side surfaces of the other end of the elastic sleeve 22 are all provided with notches 23 located between adjacent second connecting rods 21. Three groups of second compression springs 24 are connected between the inner side of the other end of the elastic sleeve 22 and the inner tube 6. Each group of second compression springs 24 is located on both sides of the second connecting rod 21 on the same side. The inner tube 6 is provided with a limiting through groove 25 for the second connecting rod 21 to rotate through and a group of giving way grooves 26 for the second compression springs 24 to be placed. A third compression spring 27 is connected between the adjacent second connecting rods 21 in the same group; a wedge-shaped protrusion 28 is fixedly arranged on the outer side surface of the elastic sleeve 22.

[0041] In summary, compared with the prior art, the utility model has the advantages of high versatility and low cost; through the fixing ring 7, the support tube 9, the necking end 11 and the retaining ring 8, the inner hole of the gear is aligned with the necking end 11, and the gear is moved on the support tube 9 until one end face of the gear abuts against one end face of the retaining ring 8, thereby playing a role in preliminary positioning of the gear; through the screw 12, the threaded ring 14, the rotating handle 13, the first connecting rod 17 and the push plate 16, and the support tube 9 is set to be composed of three arc-shaped plates 10 connected along the radial sliding connection of the inner tube 6, it is only necessary to manually rotate the rotating handle 13 to drive the screw 12 to rotate, thereby driving the threaded ring 14 to move in the direction away from the retaining ring 8, and then driving the first connecting rod 17 to rotate and push the corresponding The push plate 16 and the arc plate 10 are pushed radially outward along the inner tube 6 until all the arc plates 10 respectively abut against the inner hole side wall of the gear, and the rotation of the rotating screw 12 is stopped, so that the gears with different inner hole diameters can be initially positioned and fixed; the supporting force of the arc plate 10 at other positions on the inner hole of the gear is increased by the first compression spring 15, so that the arc plate 10 and the inner hole side wall of the gear are closely fitted, and the gear shaking is avoided to affect the positioning and fixing effect of the tooling on the gears with different inner hole diameters, so as to further position and fix the gear and further improve the overall versatility; by setting the number of arc plates 10 to three and utilizing the good stability of the triangle, the supporting stability of the inner hole of the gear is further improved.

[0042] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A positioning fixture for a gear cylindrical grinder, characterized in that: The invention comprises a positioning column and a fixing ring which are coaxially arranged, one end of the positioning column is connected to a retaining ring, one end of the fixing ring and one end of the retaining ring are coaxially fixedly connected with an inner tube, a support tube for supporting the inner hole wall of the gear is sleeved on the outer side of the inner tube, and the support tube is composed of three identical arc-shaped plates; one end of the arc-shaped plate is a constricted end, and the diameter of the other end is larger than the diameter of the fixing ring, the constricted end and the other end of the arc-shaped plate are respectively slidably connected to one end face of the fixing ring and one end face of the retaining ring along the radial direction of the inner tube, and the arc-shaped plate is connected to the inner tube by the inner tube. A plurality of first compression springs are connected between the tubes, a screw is rotatably connected between the fixing ring and the positioning column, and the screw is sleeved in the inner tube; one end of the screw passes through the fixing ring and is fixedly connected to a rotating handle, a group of threaded rings are connected to the external thread of the screw, a push plate is fixedly connected to the inner side of the arc plate, a first connecting rod is hinged between the push plate and the threaded ring, a limiting hole for the movement of the first connecting rod is opened in the inner tube, and a docking sleeve for docking with the top of the grinder is detachably and fixedly connected to the other end of the fixing ring.

2. The positioning fixture for a gear cylindrical grinder according to claim 1, characterized in that: The support tube is provided with several groups of expansion mechanisms for supporting the inner hole wall of the gear, and the expansion mechanisms include a threaded sleeve, a second connecting rod located between adjacent first connecting rods and an elastic sleeve arranged in an inverted cone shape, the threaded sleeve is threadedly connected to the outer peripheral surface of the screw rod, and three groups of second connecting rods are evenly distributed along the circumference of the threaded sleeve, the inner side of the elastic sleeve and the outer side of the threaded sleeve are hinged through the second connecting rod, one end of the elastic sleeve is fixed to the outer side surface of the inner tube, and the three side surfaces of the other end of the elastic sleeve are provided with notches located between adjacent second connecting rods, and three groups of second compression springs are connected between the inner side of the other end of the elastic sleeve and the inner tube, and each group of the second compression springs is located on both sides of the second connecting rod on the same side, and the inner tube is provided with a limiting through groove for the second connecting rod to rotate through and a group of makeshift grooves for the second compression springs to be placed, and a third compression spring is connected between the adjacent second connecting rods in the same group.

3. The positioning fixture for a gear cylindrical grinding machine according to claim 2, characterized in that: The outer side surface of the elastic sleeve is fixedly provided with wedge-shaped protrusions.

4. The positioning fixture for a gear cylindrical grinding machine according to claim 1, characterized in that: A plurality of blocking plates for blocking the threaded ring are connected inside the inner tube, and the blocking plates are located between the two ends of the first connecting rod in the same group.

5. The positioning fixture for a gear cylindrical grinding machine according to claim 1, characterized in that: The retaining ring and the positioning column are formed integrally, and one end face of the retaining ring and one end face of the fixing ring are provided with a radially arranged middle slide groove and side slide grooves on both sides of the middle slide groove, and the middle of the two end faces of the arc plate are connected with a T-shaped middle slider in the middle, and the middle slider is slidably connected in the middle slide groove, and the two end faces of the arc plate are connected with a T-shaped side slider on both sides, and the side slider is slidably connected in the side slide groove.

6. The positioning fixture for a gear cylindrical grinder according to claim 1, characterized in that: The other end of the positioning column is connected with a handle for easy grasping. The handle and the docking sleeve are both provided with a rotating groove for the grinding machine top to dock and rotate. The rotating groove is arranged in a conical shape coaxial with the inner tube.

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