A clamping and positioning device for a rack block

Abstract

The present invention discloses a clamping and positioning device for a rack block, comprising a horizontally distributed base; a laterally distributed bent plate is provided on the front and rear sides of the top surface of the base; two laterally distributed pressure plates are provided between the two bent plates; each pressure plate is connected to a bent plate; a rack block blank is placed between each pressure plate and the adjacent bent plate; the pressure plate is used to cooperate with the bent plate to longitudinally clamp the rack block blank; a positioning block is provided at the left and right ends of the top of the base; a positioning pin is provided through each positioning block; the two positioning pins are used to respectively abut the tooth surfaces on both sides of the center V-shaped tooth groove on the rack block blank. The present invention adopts a spherical positioning pin to position the center V-shaped tooth groove in the rack block blank as a positioning reference, thereby achieving precise positioning of the center V-shaped tooth groove, which is conducive to improving the processing accuracy of the rack block.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a pressing and positioning device for a rack block. Background Art

[0002] See also Figure 1a 、 Figure 1b As shown, the rack block 1 is the motion transmission component of the switch machine product. It has a rectangular appearance. Four racks 1-1 are provided on the upper end surface of the rack block 1. A central V-shaped tooth groove 2 is provided at the center of the upper end surface of the rack block 1. The four racks 1-1 are symmetrically distributed around the central V-shaped tooth groove 2 (i.e., there are two racks 1-1 on each side of the central V-shaped tooth groove 2).

[0003] Two arc portions 3 with a radius of R are respectively provided on both sides of the rack block 1, i.e., there are four arc portions 3 in total, and the distance between the centers of the two arc portions 3 on the same side (i.e., the eccentricity) is a;

[0004] The distance between the center line of the central V-shaped tooth groove 2 and the center of the adjacent arc parts 3 on its left and right sides is L;

[0005] The distance L between the center of the arc portion 3 and the center V-shaped tooth groove 2, and the sum L+a of the center spacing (ie, eccentricity) a and the distance L, are the key to ensuring the operation accuracy of the switch machine.

[0006] In order to obtain high-precision rack block 1, the process requirements of the workpiece are: the workpiece (ie Figure 1c The rack block blank 1-0) shown has a bottom positioning surface 4, a left positioning surface 5, a right positioning surface 6 and a center V-shaped tooth groove 2 as positioning references, and the above-mentioned four arc portions 3 are processed.

[0007] See also Figure 1c As shown, the rack block blank 1-0 before grinding has four blank arc portions, namely, four blank arc portions 3-0 with machining allowances R. That is, the distance between the center of the blank arc portion 3-0 and the center line of the center V-shaped tooth groove 2 is L+a / 2, and the radius of the blank arc portion 3-0 is R′, which is smaller than the finished size R (that is, the radius R of the arc portion 3 on the finished rack block 1) (specifically, it is 0.2 mm smaller).

[0008] However, the currently available general positioning and clamping devices cannot meet the positioning requirements for the rack block blank, so that the four arc portions 3 cannot be accurately machined on the rack block blank, and thus a finished rack block with high machining accuracy cannot be obtained. Summary of the Invention

[0009] The purpose of the present invention is to provide a rack block pressing and positioning device in view of the technical defects in the prior art.

[0010] To this end, the present invention provides a rack block pressing and positioning device, comprising a horizontally distributed base;

[0011] A transversely distributed curved plate is provided on both the front and rear sides of the top surface of the base;

[0012] The two bent plates are parallel to each other and symmetrically distributed front to back;

[0013] Two laterally distributed pressing plates are provided between the two bent plates;

[0014] Each pressing plate is connected to a bent plate;

[0015] The rack block blank to be processed is placed on the top surface of the base between each pressing plate and the adjacent bending plate;

[0016] The pressing plate is used to cooperate with the bending plate to longitudinally press the rack block blank between the two;

[0017] There is a positioning block at the left and right ends of the top of the base respectively;

[0018] Each positioning block is provided with a positioning pin running through it longitudinally;

[0019] The two locating pins are used to respectively abut the tooth surfaces on both sides of the center V-shaped tooth groove on the adjacent rack block blanks.

[0020] It can be seen from the technical solution provided by the present invention above that, compared with the prior art, the present invention provides a clamping and positioning device for a rack block, which has a scientific structural design and adopts a spherical positioning pin to position the center V-shaped tooth groove in the rack block blank as a positioning reference. The axis of the positioning spherical surface of the positioning pin is the center of the center V-shaped tooth groove, which realizes the precise positioning of the center V-shaped tooth groove, thereby effectively avoiding the positioning error caused by the machining error of the center V-shaped tooth groove on the rack block blank, which is beneficial to improving the machining accuracy of the rack block, so that the arc portion can be accurately machined on the rack block blank by the machining equipment, and finally a finished rack block with high machining accuracy is obtained, which has great practical significance.

[0021] In addition, the present invention relates to an auxiliary positioning device for machining eccentric arc surfaces symmetrical to the central V-shaped tooth grooves of the rack block blank. The present invention realizes grinding (i.e., grinding) of the eccentric arc portions located on both sides of the rack block blank by adopting an adjustable positioning structure combining a positioning block and a positioning key, thereby ensuring machining accuracy and reducing workpiece machining costs.

[0022] By applying the present invention, the problem of how to use the V-shaped tooth groove of the workpiece for positioning to perform grinding of the eccentric arc part is solved. The use of the device of the present invention significantly improves work efficiency. The present invention has a scientific structure, convenient and fast operation, and accurate and reliable processing accuracy, which plays a role in reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1a Schematic diagram 1 of the three-dimensional structure of the finished rack block;

[0024] Figure 1b Schematic diagram of the three-dimensional structure of the finished rack block Figure 2 ;

[0025] Figure 1c Schematic diagram of the three-dimensional structure of the rack block blank to be processed;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of a rack block pressing and positioning device provided by the present invention in working state;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of a rack block pressing and positioning device provided by the present invention, when the pressing plate and the pressing plate supporting structure located on the front side are removed;

[0028] Figure 4a A top view of the base of a rack block pressing and positioning device provided by the present invention;

[0029] Figure 4b A left side cross-sectional view of the base of a rack block pressing and positioning device provided by the present invention;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of a base of a rack block pressing and positioning device provided by the present invention when viewed from the bottom side;

[0031] Figure 6a Schematic diagram 1 of the three-dimensional structure of the bent plate in the rack block pressing and positioning device provided by the present invention;

[0032] Figure 6b In the rack block pressing and positioning device provided by the present invention, the three-dimensional structure of the bent plate is shown as follows: Figure 2 ;

[0033] Figure 7a A top view of a positioning block in a rack block pressing and positioning device provided by the present invention;

[0034] Figure 7b A cross-sectional view of a positioning block in a rack block pressing and positioning device provided by the present invention;

[0035] Figure 7cA front view of a positioning block in a rack block pressing and positioning device provided by the present invention;

[0036] Figure 8 A schematic diagram of the three-dimensional structure of a positioning block in a rack block pressing and positioning device provided by the present invention;

[0037] Figure 9 A schematic diagram of the three-dimensional structure of a pressing plate in a rack block pressing and positioning device provided by the present invention;

[0038] Figure 10 A schematic diagram of the three-dimensional structure of a clamping bolt in a clamping and positioning device for a rack block provided by the present invention;

[0039] Figure 11 A schematic diagram of the three-dimensional structure of a support rod in a rack block pressing and positioning device provided by the present invention;

[0040] Figure 12 A schematic diagram of the three-dimensional structure of a base positioning plate in a rack block pressing and positioning device provided by the present invention;

[0041] Figure 13 A schematic diagram of the three-dimensional structure of a cover plate in a rack block pressing and positioning device provided by the present invention;

[0042] Figure 14 A schematic diagram of the three-dimensional structure of a positioning pin in a rack block pressing and positioning device provided by the present invention;

[0043] Figure 15 A schematic structural diagram of a spring in a rack block pressing and positioning device provided by the present invention;

[0044] Figure 16 A schematic diagram of the three-dimensional structure of a positioning key in a rack block pressing and positioning device provided by the present invention;

[0045] Figure 17a A schematic diagram of the front structure of an adjusting bolt in a rack block pressing and positioning device provided by the present invention;

[0046] Figure 17b A schematic side view of the structure of an adjusting bolt in a rack block pressing and positioning device provided by the present invention;

[0047] Figure 18 A schematic diagram of the three-dimensional structure of a fixing frame in a rack block pressing and positioning device provided by the present invention;

[0048] Figure 19 A schematic diagram of the three-dimensional structure of a threaded sleeve in a rack block pressing and positioning device provided by the present invention;

[0049] Figure 20 A schematic diagram of the three-dimensional structure of a bent plate positioning plate in a rack block pressing and positioning device provided by the present invention;

[0050] In the figure, 1. rack block, 1-0. rack block blank, 1-1. rack, 2. center V-shaped tooth groove, 3. arc portion, 3-0. blank arc portion, 4. bottom positioning surface, 5. left positioning surface;

[0051] 6. Right positioning surface, 7. Base, 8. Bend plate, 9. Positioning block, 10. Press plate;

[0052] 11. Clamping bolt, 12. Support rod, 13. Base positioning plate, 14. Cover plate, 15. Positioning pin;

[0053] 16. Spring, 17. Positioning key, 18. Adjusting bolt, 19. Fixing bracket, 20. Threaded sleeve;

[0054] 21. Round table, 22. Stopper, 23. Screw hole, 24. Cutting hole, 25. Groove;

[0055] 26. Bend plate screw mounting hole, 27. Base positioning plate mounting hole, 28. Bend plate boss, 29. Vertical surface, 30. Bend plate positioning plate;

[0056] 31. Bend plate mounting hole, 32. Bend plate positioning plate mounting hole, 33. Threaded sleeve mounting hole, 34. Threaded sleeve mounting portion, 35. Round table;

[0057] 36. Anti-rotation hole, 37. Reinforcement rib, 38. Threaded sleeve threaded hole, 39. Long round hole, 40. Pressing platform;

[0058] 41. Support hole, 42. Round head, 43. Keyway, 44. Positioning block mounting hole, 45. Fixing bracket mounting hole;

[0059] 46. Positioning block keyway, 47. Cutting edge, 48. Step hole, 49. Cover plate mounting hole, 50. Positioning pin mounting hole;

[0060] 51. Cover plate boss, 52. Guide end, 53. Positioning end, 54. Clamping table, 55. Positioning spherical surface;

[0061] 56. Adjustment bolt mounting hole, 57. Adjustment bolt end, 58. Adjustment bolt slot, 59. Adjustment bolt hole, 60. Fixed frame shaft;

[0062] 61. Fixed frame flat, 62. Fixed frame flat threaded hole, 63. Positioning block oblong hole, 64. Clamping bolt flat part, 65. Clamping bolt thread DETAILED DESCRIPTION

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood broadly. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on specific circumstances.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0067] See also Figures 2 to 3 、 Figures 4a to 4b 、 Figure 5 、 Figure 6a 、 Figure 6b 、 Figures 7a to 7c 、 Figures 8 to 16 、 Figure 17a 、 Figure 17b as well as Figures 18 to 20 , the present invention provides a rack block pressing and positioning device, comprising a horizontally distributed base 7;

[0068] A transversely distributed curved plate 8 is provided on both the front and rear sides of the top surface of the base 7;

[0069] The two bent plates 8 are parallel to each other and symmetrically distributed front to back;

[0070] Two laterally distributed pressing plates 10 are provided between the two bent plates 8;

[0071] Each pressing plate 10 is connected to a bent plate 8;

[0072] On the top surface of the base 7, between each pressing plate and the adjacent bent plate 8, a rack block blank 1-0 to be processed is placed;

[0073] The pressing plate 10 is used to cooperate with the bending plate 8 to longitudinally press the rack block blank 1-0 between the two;

[0074] It should be noted that, as described in the background technology section, the rack block blank 1-0 has a bottom positioning surface 4, a left positioning surface 5, a right positioning surface 6 and a center V-shaped tooth groove 2. It is necessary to use the bottom positioning surface 4, the left positioning surface 5, the right positioning surface 6 and the center V-shaped tooth groove 2 as positioning references to process the four arc portions 3.

[0075] See also Figure 4a 、 Figure 4b As shown, a positioning block 9 is provided at the left and right ends of the top of the base 7;

[0076] Each positioning block 9 is provided with a positioning pin 15 running through it longitudinally;

[0077] The positioning spherical surfaces 55 at one end of the two positioning pins 15 are respectively used to abut (i.e., press tightly) the tooth surfaces on both sides of the center V-shaped tooth groove 2 on the adjacent rack block blank 1-0 (i.e., the tooth surfaces in the opposite directions of the two adjacent racks 1-1 on both sides of the center V-shaped tooth groove 2).

[0078] In the present invention, the specific implementation is as follows: Figure 4a As shown, a groove 25 is provided on both the front and rear sides of the top surface of the base 7;

[0079] The two grooves 25 are symmetrically distributed front to back;

[0080] A bent plate 8 is vertically arranged on each groove 25;

[0081] The two bent plates 8 are symmetrically distributed front to back.

[0082] For specific implementation, see Figure 6a As shown, the bottom rear end of the bent plate 8 is provided with a plurality of vertically penetrating bent plate mounting holes 31;

[0083] The base 7 is provided with a bent plate screw mounting hole 26 at a position corresponding to each bent plate mounting hole 31;

[0084] The bent plate 8 is fixed to the top of the base 7 by a plurality of screws;

[0085] Each screw passes through the bent plate mounting hole 31 from top to bottom and is screwed and fixedly connected with the bent plate screw mounting hole 26 at the corresponding position;

[0086] For specific implementation, see Figure 6a As shown, the lower end surface of the bent plate 8 is provided with a bent plate boss 28;

[0087] The shape and size of the bent plate boss 28 correspond to the shape and size of the groove 25 (i.e., the shape and size match);

[0088] It should be noted that the bent plate boss 28 is used for longitudinal positioning of the bent plate 8 on the base 7 .

[0089] For specific implementation, see Figure 3 As shown, two base positioning plates 13 are respectively provided on the inner sides of the two bent plates 8 (which are also the inner sides of the two grooves 25 on the base 7);

[0090] The base positioning plate 13 is fixed to the top of the base 7;

[0091] Furthermore, each base positioning plate 13 is provided with a base positioning plate countersunk hole 13 - 0 at both ends;

[0092] On the top of the base 7, a base positioning plate mounting hole 27 is provided at a position corresponding to each base positioning plate mounting countersunk hole 13-0;

[0093] The base positioning plate 13 is fixed to the top of the base 7 by countersunk screws;

[0094] After the countersunk screw passes through the countersunk hole 13 - 0 of the base positioning plate, it is threadedly fixedly connected with the corresponding mounting hole 27 of the base positioning plate.

[0095] In the present invention, the specific implementation is as follows: Figure 3 As shown, the two opposite sides of the bent plates 8 each have a facade 29;

[0096] On each facade 29, there are two vertically distributed bent plate positioning plates 30;

[0097] Each bent plate positioning plate 30 is respectively arranged corresponding to a base positioning plate 13 on the top surface of the base 7;

[0098] The base positioning plate 13 is used to support the bottom positioning surface 4 of the rack block blank 1-0;

[0099] The bent plate positioning plate 30 is used to abut against the left positioning surface 5 of the rack block blank 1-0;

[0100] It should be noted that, for the present invention, through the base positioning plate 13 and the bent plate positioning plate 30, the bottom positioning surface 4 and the left positioning surface 5 of the workpiece rack block to be processed (i.e., the rack block blank 1-0) can be respectively offset against the base positioning plate 13 and the bent plate positioning plate 30, thereby realizing the positioning of the two positioning end faces of the rack block blank 1-0.

[0101] In a specific implementation, the projection of the center point of the bent plate positioning plate 30 on the horizontal plane is located on the longitudinal center axis of the base positioning plate 13 .

[0102] In specific implementation, the bent plate positioning plate 30 is mounted on the bent plate 8 by countersunk screws;

[0103] A bent plate positioning plate countersunk hole 30 - 0 is provided at each end of the bent plate positioning plate 30 ;

[0104] The bent plate 8 is provided with a bent plate positioning plate mounting hole 32 at a position corresponding to each bent plate positioning plate countersunk hole 30-0;

[0105] After the countersunk screw passes through the countersunk hole 30 - 0 of the bent plate positioning plate, it is threadedly fixedly connected with the corresponding mounting hole 32 of the bent plate positioning plate.

[0106] In the present invention, the specific implementation is as follows: Figure 2 As shown, a longitudinally distributed threaded sleeve 20 is provided at the center of each bent plate 8;

[0107] Regarding the structural design of the threaded sleeve 20, see Figure 19 The specific instructions are as follows:

[0108] A threaded sleeve mounting hole 33 is provided at the center of each bent plate 8;

[0109] The threaded sleeve 20 includes a truncated cone 35 and a threaded sleeve mounting portion 34 located at the center of the rear side of the truncated cone 35;

[0110] The threaded sleeve mounting portion 34 is embedded in the threaded sleeve mounting hole 33;

[0111] The frustum 35 is located at the front side of the bent plate 8 .

[0112] In specific implementation, the sizes of the threaded sleeve mounting portion 34 and the threaded sleeve mounting hole 33 are transition fit.

[0113] Specifically, an anti-rotation hole 36 is provided on the radial outer side of the hole wall of the threaded sleeve mounting hole 33;

[0114] The anti-rotation hole 36 is connected to the threaded sleeve mounting hole 33;

[0115] The anti-rotation hole 36 is used to screw in a screw. The screw is located between the threaded sleeve mounting portion 34 of the threaded sleeve 20 and the wall of the threaded sleeve mounting hole 33, thereby preventing the threaded sleeve 20 from rotating.

[0116] It should be noted that after the threaded sleeve mounting portion 34 of the threaded sleeve 20 is installed in the threaded sleeve mounting hole 33, an anti-rotation hole 36 is provided at the arc where the threaded sleeve mounting hole 33 and the threaded sleeve mounting portion 34 abut, and a screw is screwed in to prevent the threaded sleeve 20 from rotating.

[0117] Specifically, the threaded sleeve 20 is provided with a threaded sleeve threaded hole 38 that passes through the longitudinal direction (the threaded sleeve threaded hole 38 passes through the truncated cone 35 and the threaded sleeve mounting portion 34);

[0118] The threaded sleeve is used to install the clamping bolt 11 in the threaded hole 38;

[0119] The pressing plate 10 is provided with a longitudinally penetrating oblong hole 39 at a position corresponding to the adjacent threaded sleeve threaded hole 38;

[0120] See also Figure 2 、 Figure 9 As shown, the clamping bolt 11 is threadedly connected with the threaded sleeve threaded hole 38 in the threaded sleeve 20 after passing through the oblong hole 39 in the middle of the pressure plate 10 .

[0121] Furthermore, one end of the clamping bolt 11 (specifically the end with a smaller diameter, i.e., the small end) is provided with a clamping bolt threaded portion 65 that is threadedly connected to the threaded sleeve 20.

[0122] The other end of the clamping bolt 11 (specifically the end with a larger diameter, i.e., the large end) is provided with a clamping bolt flat portion 64 for easy screwing.

[0123] For specific implementation, see Figure 9 As shown, a press platform 40 is provided at the lower end of each pressing plate 10;

[0124] A pressing platform 40 is used to press the rack 1-1 on the adjacent rack block blank 1-0;

[0125] A support hole 41 is provided at the upper end of each pressing plate 10;

[0126] The two support holes 41 are provided with one end of two support rods 12.

[0127] The rounded heads 42 at the other ends of the two support rods 12 abut against the opposite sides (i.e., inner sides) of the two bent plates 8 respectively.

[0128] Furthermore, the two pressing plates 10 are centrally symmetrically distributed.

[0129] In the present invention, the specific implementation is as follows: Figure 2As shown, two symmetrically distributed reinforcing ribs 37 are respectively arranged at intervals on opposite sides of the two bent plates 8 .

[0130] The bottom of the reinforcing rib 37 is connected to the bottom of the bent plate 8;

[0131] It should be noted that the reinforcing rib 37 and the bent plate 8 are preferably formed in one piece.

[0132] In the present invention, the specific implementation is as follows: Figure 5 As shown, a circular truncated table 21 is provided at the center of the bottom surface of the base 7;

[0133] The inner cavity of the truncated cone 21 is surrounded by side walls with stoppers 22;

[0134] The stopper 22 is used to connect with the accessories (specifically the grinding machine spindle) located on the external grinding machine workbench, that is, to be installed in a coordinated manner;

[0135] The bottom surface of the truncated table 21 is provided with a plurality of (not limited to three) screw holes 23 at intervals.

[0136] A vertically penetrating knife hole 24 is provided at the center of the base 7 and the truncated table 21;

[0137] In the present invention, in a specific implementation, a fixing frame 19 is provided at the left and right ends of the top of the base 7;

[0138] The two positioning blocks 9 and the two fixing brackets 19 are both symmetrically distributed on the left and right sides;

[0139] Two fixing brackets 19 are located outside the two positioning blocks 9;

[0140] Each fixing bracket 19 is connected to the adjacent positioning block 9 via an adjusting bolt 18;

[0141] In a specific implementation, the two positioning blocks 9 and the two fixing brackets 19 are symmetrically distributed with the cutter hole 24 at the center of the base 7 as the center.

[0142] In specific implementation, the lower end surface of each positioning block 9 is provided with a laterally distributed positioning block keyway 46 (a groove);

[0143] A key slot 43 is provided on the top of the base 7 at a position corresponding to each positioning block key slot 46;

[0144] Each keyway 43 is provided with a positioning key 17;

[0145] The positioning key 17 is connected in a mating manner with the positioning block keyway 46 (specifically, a transverse sliding mating connection);

[0146] Furthermore, the lower end surface of each positioning block 9 is provided with two positioning block oblong holes 63;

[0147] On the top of the base 7, a positioning block mounting hole 44 is provided at a position corresponding to each positioning block oblong hole 63;

[0148] The positioning block 9 is fixed to the top of the base 7 by screws;

[0149] After the screw passes through the oblong hole 63 of the positioning block from top to bottom, it is threadedly fixed with the corresponding positioning block mounting hole 44;

[0150] It should be noted that the positioning block 9 is installed in the positioning block mounting hole 44 by screws, and the positioning key 17 on the key slot 43 is matched with the positioning block key slot 46 on the lower end surface of the positioning block 9 to achieve the positioning installation of the positioning block 9 on the base 7.

[0151] In specific implementation, a fixing bracket mounting hole 45 is provided on the top of the base 7 at a position corresponding to each fixing bracket 19;

[0152] The lower end of each fixing frame 19 is provided with a fixing frame shaft 60;

[0153] The fixing frame shaft 60 at the lower end of each fixing frame 19 is respectively disposed in (i.e., plugged into) a fixing frame mounting hole 45;

[0154] Furthermore, the upper ends of the two fixing frames 19 respectively have fixing frame flats 61;

[0155] A horizontally penetrating threaded hole 62 is provided at the center of each fixing bracket 61;

[0156] On opposite sides of the two positioning blocks 9, adjustment bolt mounting holes 56 are provided at positions corresponding to the fixing frame flat threaded holes 62 on the adjacent fixing frames 19;

[0157] After the adjusting bolt 18 passes horizontally through the flat threaded hole 62 of the fixing frame, it connects with the adjusting bolt mounting hole 56 on the positioning block 9;

[0158] The adjusting bolt 18 is threadedly connected to the flat threaded hole 62 of the fixing frame;

[0159] Furthermore, the adjusting bolt 18 passes through the flat threaded hole 62 of the fixing frame horizontally and connects with the adjusting bolt mounting hole 56 on the positioning block 9. The specific structure is as follows:

[0160] The adjusting bolt 18 has an adjusting bolt end portion 57 at its end, which is mounted in the adjusting bolt mounting hole 56 of the positioning block 9;

[0161] The adjusting bolt end portion 57 is provided with an inwardly concave adjusting bolt retaining groove 58 in a circumferential manner;

[0162] The positioning block 9 is provided with an adjusting bolt hole 59 which passes vertically through the positioning block 9 at a position corresponding to the adjusting bolt slot 58;

[0163] The end of the adjusting bolt 18 is connected to the positioning block 9 through a pin;

[0164] The pin passes through the adjusting bolt hole 59 and the adjusting bolt slot 58 from top to bottom.

[0165] It should be noted that the adjusting bolt end portion 57 at the end of the adjusting bolt 18 is installed in the adjusting bolt mounting hole 56 of the positioning block 9, and is passed through the adjusting bolt hole clamping hole 59 and the adjusting bolt clamping groove 58 from top to bottom by a pin. This design can prevent the adjusting bolt 18 from coming out of the adjusting bolt mounting hole 56 when the adjusting bolt 18 is restricted from rotating.

[0166] It should be noted that the adjusting bolt 18 passes through the flat threaded hole 62 of the fixing frame and is rotated to adjust the horizontal left and right position of the positioning block 9, thereby achieving left and right adjustment of the position of the positioning pin 15 installed in the positioning block 9.

[0167] In specific implementation, each positioning block 9 is provided with a concave cutter-releasing arc surface 47 at one end close to the cutter-releasing hole 24;

[0168] A longitudinally penetrating stepped hole 48 is provided at the middle of each positioning block 9, which is biased toward one side of the knife-releasing arc surface 47;

[0169] A positioning pin 15 is longitudinally provided in the stepped hole 48 .

[0170] Furthermore, the positioning block 9 is provided with an adjustment bolt mounting hole 56 at one end away from the cutter hole 24 (i.e., the other end face away from the cutter arc surface 47);

[0171] Furthermore, the radius of the cutter arc surface 47 is larger than the radius of the cutter hole 24 , for example, 1 mm larger.

[0172] Furthermore, the diameter of the openings on the opposite sides of the two stepped holes 48 is larger than the diameter of the openings on the opposite sides.

[0173] Furthermore, two cover plate mounting holes 49 are respectively provided on the end faces of the two positioning blocks 9 on the opposite side (i.e. the end faces on the side with the larger opening of the step hole 48);

[0174] Two cover plate mounting holes 49 are symmetrically distributed on both sides of the step hole 48;

[0175] The end surfaces on opposite sides of the two positioning blocks 9 are respectively connected to a cover plate 14;

[0176] It is installed in the cover plate mounting hole 49 of the positioning block 9 by screws.

[0177] Furthermore, a cover plate boss 51 is provided at the middle position of each cover plate 14;

[0178] A longitudinally penetrating positioning pin mounting hole 50 is provided at the center of the cover boss 51;

[0179] The cover plate boss 51 is located in the stepped hole 48 (specifically, located at the large end of the stepped hole 48);

[0180] Furthermore, the two ends of the positioning pin 15 respectively have a positioning end 53 and a guide end 52;

[0181] The positioning end 53 and the guide end 52 are located on the same central axis;

[0182] The guide end 52 of the positioning pin 15 is slidably engaged with the small end of the stepped hole 48;

[0183] The positioning end 53 of the positioning pin 15 is located in the cover plate boss 51 (specifically, in the positioning pin mounting hole 50 on the cover plate boss 51);

[0184] The outer wall of the guide end 52 is sheathed with a spring;

[0185] A clamping platform 54 is provided in the middle of the positioning pin 15 , and the clamping platform 54 is used to be clamped in the position between the step of the step hole 48 and the spring 16 mounted on the guide end 52 , thereby preventing the positioning pin 15 from falling out of the step hole 48 .

[0186] It should be noted that the cover boss 51 is built into the large end of the step hole 48 and is used to guide the longitudinal movement of the guide end 52 of the positioning pin 15. At the same time, the positioning end 53 coaxial with the guide end 52 is sized to slide with the small end of the step hole 48.

[0187] Furthermore, the distal end of the positioning end 53 of the positioning pin 15 is a positioning spherical surface 55;

[0188] The positioning spherical surface 55 on the positioning pin 15 faces the direction of the adjacent bent plate 8;

[0189] In order to more clearly understand the technical solution of the present invention, the working principle of the present invention is described below.

[0190] First, install the device of the present invention on the external grinding machine spindle, adjust the adjusting bolt 18, and move the positioning block 9 horizontally to the position where the distance between the axis of the positioning pin 15 and the center of the machine tool (i.e., the central axis of the grinding machine spindle) is L (this can be measured with the aid of a ruler), tighten the screws on the positioning block 9, and place the workpiece rack block to be processed (i.e., the rack block blank 1-0) on the top of the base 1 of the device.

[0191] Then, the bottom positioning surface 4 and the left positioning surface 5 of the workpiece rack block to be processed (i.e., the rack block blank 1-0) are respectively against the base positioning plate 13 and the bent plate positioning plate 30, so as to realize the positioning of the two positioning end surfaces of the rack block blank 1-0.

[0192] Then, adjust the position of the rack block blank 1-0 left and right so that the positioning spherical surface 55 of the positioning pin 15 is against the tooth surfaces on both sides of the center V-shaped tooth groove 2 (i.e., the tooth surfaces of the two adjacent racks 1-1 in opposite directions on both sides of the center V-shaped tooth groove 2). The positioning spherical surface 55 presses the tooth surfaces on both sides of the center V-shaped tooth groove 2 of the rack block blank 1-0 under the pressure of the spring 16.

[0193] Among them, since the positioning spherical surface 55 is symmetrical about the center line of the positioning pin 15, and the center line of the center V-shaped tooth groove 2 is the symmetry center of the rack block blank 1-0, the left and right positioning of the rack block blank 1-0 is achieved. At this time, the positioning of the rack block blank 1-0 in the device is completed.

[0194] Then, the pressing platforms 40 of the two pressing plates 10 are pressed against the opposite end faces of the racks of the two rack block blanks 1-0, the clamping bolts 11 are tightened, and the grinding machine is started. The tool (such as a milling cutter) installed on the grinding machine spindle can complete the processing of the arc portion 3 (the first arc portion 3) at a distance L from the center of the machine tool (i.e., the central axis of the grinding machine spindle);

[0195] Then, loosen the clamping bolt 11 so that the pressing platform 40 of the pressing plate 10 no longer presses the rack block blank 1-0, thereby removing the rack block blank 1-0 and rotating the rack block blank 1-0 horizontally by 180°. Then, the arc portion 3 (the second arc portion 3) at a distance L between the other side of the rack block blank 1-0 and the center of the machine tool (i.e., the central axis of the grinding machine spindle) can be machined.

[0196] Then, remove the rack block blank 1-0, adjust the adjusting bolt 18, and move the positioning block 9 horizontally until the distance between the axis of the positioning pin 15 and the center of the machine tool is L+a, and the processing of an arc portion 3 (the third arc portion 3) on the outer side of the workpiece can be completed;

[0197] Then, the adjusting bolt 18 is adjusted again to move the positioning block 9 horizontally until the distance between the axis of the positioning pin 15 and the center of the machine tool is L+a, and the processing of the fourth arc portion 3 is completed.

[0198] To sum up, compared with the prior art, the clamping and positioning device for a rack block provided by the present invention has a scientific structural design, and adopts a spherical positioning pin to position the center V-shaped tooth groove in the rack block blank as a positioning reference. The axis of the positioning spherical surface of the positioning pin is the center of the center V-shaped tooth groove, which realizes the precise positioning of the center V-shaped tooth groove, thereby effectively avoiding the positioning error caused by the machining error of the center V-shaped tooth groove on the rack block blank, which is beneficial to improving the machining accuracy of the rack block, so that the arc portion can be accurately machined on the rack block blank by the machining equipment, and finally a finished rack block with high machining accuracy is obtained, which has great practical significance.

[0199] In addition, the present invention relates to an auxiliary positioning device for machining eccentric arc surfaces symmetrical to the central V-shaped tooth grooves of the rack block blank. The present invention realizes grinding (i.e., grinding) of the eccentric arc portions located on both sides of the rack block blank by adopting an adjustable positioning structure combining a positioning block and a positioning key, thereby ensuring machining accuracy and reducing workpiece machining costs.

[0200] By applying the present invention, the problem of how to use the V-shaped tooth groove of the workpiece for positioning to perform grinding of the eccentric arc part is solved. The use of the device of the present invention significantly improves work efficiency. The present invention has a scientific structure, convenient and fast operation, and accurate and reliable processing accuracy, which plays a role in reducing costs and increasing efficiency.

[0201] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A rack block pressing and positioning device, characterized in that: comprising a horizontally distributed base (7); A curved plate (8) is provided on both the front and rear sides of the top of the base (7) and is laterally distributed; The two bent plates (8) are parallel to each other and symmetrically distributed front to back; Two laterally distributed pressing plates (10) are provided between the two bent plates (8); Each pressing plate (10) is connected to a bent plate (8); A rack block blank (1-0) to be processed is placed on the top surface of the base (7) between each pressing plate and the adjacent bent plate (8); The pressing plate (10) is used to cooperate with the bending plate (8) to longitudinally press the rack block blank (1-0) therebetween; A positioning block (9) is provided at the left and right ends of the top of the base (7); Each positioning block (9) is provided with a positioning pin (15) running through it longitudinally; Two positioning pins (15) are used to respectively abut the tooth surfaces on both sides of the center V-shaped tooth groove (2) on adjacent rack block blanks (1-0); A groove (25) is provided on the front and rear sides of the top surface of the base (7); The two grooves (25) are symmetrically distributed front to back; A bent plate (8) is vertically arranged on each groove (25); The two bent plates (8) are symmetrically distributed front and back; Two base positioning plates (13) are respectively provided on the inner sides of the two bent plates (8); Each base positioning plate (13) is provided with a base positioning plate countersunk hole (13-0) at both ends; A base positioning plate mounting hole (27) is provided on the top of the base (7) at a position corresponding to each base positioning plate countersunk hole (13-0); The base positioning plate (13) is fixed to the top of the base (7) by countersunk screws; After the countersunk screw passes through the countersunk hole (13-0) of the base positioning plate, it is threadedly fixedly connected with the mounting hole (27) of the base positioning plate corresponding to the position; The two bent plates (8) have respective vertical surfaces (29) on opposite sides; Two vertically distributed bent plate positioning plates (30) are provided on each facade (29); Each bent plate positioning plate (30) is respectively arranged correspondingly to a base positioning plate (13) on the top surface of the base (7); A base positioning plate (13) is used to support the left positioning surface (5) of the rack block blank (1-0); A bent plate positioning plate (30) is used to abut against a bottom positioning surface (4) of the rack block blank (1-0); The lower end surface of each positioning block (9) is provided with a positioning block keyway (46) distributed laterally; A key slot (43) is provided on the top of the base (7) at a position corresponding to each positioning block key slot (46); A positioning key (17) is provided on each keyway (43); The positioning key (17) is connected to the positioning block keyway (46) in a transverse sliding manner; The lower end surface of each positioning block (9) is provided with two positioning block oblong holes (63); A positioning block mounting hole (44) is provided on the top of the base (7) at a position corresponding to each positioning block oblong hole (63); A positioning block (9) is fixed to the top of the base (7) by screws; After the screw passes through the oblong hole (63) of the positioning block from top to bottom, it is threadedly fixedly connected with the positioning block mounting hole (44) corresponding to the position.

2. The rack block pressing and positioning device according to claim 1, characterized in that: The bottom rear end of the bent plate (8) is provided with a plurality of bent plate mounting holes (31) extending vertically therethrough; The base (7) is provided with a bent plate screw mounting hole (26) at a position corresponding to each bent plate mounting hole (31); A bent plate (8) is fixed to the top of the base (7) by a plurality of screws; Each screw, after passing through the bent plate mounting hole (31) from top to bottom, is threadedly fixedly connected with the bent plate screw mounting hole (26) at the corresponding position; and / or, a bent plate boss (28) is provided on the lower end surface of the bent plate (8); The shape and size of the bent plate boss (28) correspond to the shape and size of the groove (25).

3. The rack block pressing and positioning device according to claim 1, characterized in that: A longitudinally distributed threaded sleeve (20) is provided at the center of each bent plate (8); A longitudinally penetrating threaded sleeve mounting hole (33) is provided at the center of each bent plate (8); The threaded sleeve (20) includes a first truncated cone (35) and a threaded sleeve mounting portion (34) located at the center of the rear side of the first truncated cone (35); The threaded sleeve mounting portion (34) is embedded in the threaded sleeve mounting hole (33); A first frustum (35) is located on the front side of the bent plate (8); And / or, an anti-rotation hole (36) is provided on the radial outer side of the hole wall of the threaded sleeve mounting hole (33); The anti-rotation hole (36) is connected to the threaded sleeve mounting hole (33); an anti-rotation hole (36) for screwing in a screw; and / or, a threaded sleeve threaded hole (38) is provided in the threaded sleeve (20) and extends longitudinally therethrough; The threaded sleeve is used to install the clamping bolt (11) in the threaded hole (38); The pressing plate (10) is provided with a longitudinally penetrating oblong hole (39) at a position corresponding to the adjacent threaded sleeve threaded hole (38); The clamping bolt (11) is threadedly connected with the threaded sleeve threaded hole (38) in the threaded sleeve (20) after passing through the oblong hole (39) in the middle of the pressing plate (10).

4. The rack block pressing and positioning device according to claim 1, characterized in that: A pressing platform (40) is provided at the lower end of each pressing plate (10); A pressing platform (40) is used for pressing the rack (1-1) on the adjacent rack block blank (1-0); A support hole (41) is provided at the upper end of each pressing plate (10); Two support holes (41) are provided with one end of two support rods (12) The other ends of the two support rods (12) have round heads (42) which respectively abut against opposite sides of the two bent plates (8); The two pressing plates (10) are centrally symmetrically distributed.

5. The rack block pressing and positioning device according to claim 1, characterized in that: A second circular truncated cone (21) is provided at the center of the bottom surface of the base (7); The side walls of the inner cavity of the second truncated cone (21) are surrounded by stoppers (22); A stopper (22) for connecting to an accessory located on an external grinding machine workbench; The bottom surface of the second truncated cone (21) is provided with a plurality of screw holes (23) at intervals; A vertically penetrating knife hole (24) is provided at the center of the base (7) and the second truncated table (21); A fixing frame (19) is provided at the left and right ends of the top of the base (7); The two positioning blocks (9) and the two fixing frames (19) are both symmetrically distributed on the left and right sides; Two fixing frames (19) are located outside the two positioning blocks (9); Each fixing frame (19) is connected to an adjacent positioning block (9) via an adjusting bolt (18).

6. The rack block pressing and positioning device according to claim 5, characterized in that: A fixing bracket mounting hole (45) is provided on the top of the base (7) at a position corresponding to each fixing bracket (19); A fixing frame shaft (60) is provided at the lower end of each fixing frame (19); The fixing frame shaft (60) at the lower end of each fixing frame (19) is respectively arranged in a fixing frame mounting hole (45); The upper ends of the two fixing frames (19) are respectively provided with fixing frame flats (61); A horizontally penetrating threaded hole (62) is provided at the center of each fixing bracket (61); Adjustment bolt mounting holes (56) are provided on opposite sides of the two positioning blocks (9) at positions corresponding to the fixing frame flat threaded holes (62) on the adjacent fixing frames (19); After the adjusting bolt (18) passes through the flat threaded hole (62) of the fixing frame horizontally, it is connected with the adjusting bolt mounting hole (56) on the positioning block (9); The adjusting bolt (18) is threadedly connected to the flat threaded hole (62) of the fixing frame; Among them, after the adjusting bolt (18) passes through the flat threaded hole (62) of the fixing frame horizontally, it is connected with the adjusting bolt mounting hole (56) on the positioning block (9). The specific structure is as follows: The adjusting bolt (18) has an adjusting bolt terminal portion (57) at its terminal end, which is mounted in the adjusting bolt mounting hole (56) of the positioning block (9); An inwardly concave adjusting bolt clamping groove (58) is circumferentially provided on the adjusting bolt end portion (57); The positioning block (9) is provided with an adjusting bolt hole (59) which vertically penetrates the positioning block (9) at a position corresponding to the adjusting bolt slot (58); The end of the adjusting bolt (18) is connected to the positioning block (9) via a pin; The pin passes through the adjusting bolt hole (59) and the adjusting bolt groove (58) from top to bottom.

7. The rack block pressing and positioning device according to claim 5 or 6, characterized in that: Each positioning block (9) is provided with a concave cutter-allowing arc surface (47) at one end close to the cutter-allowing hole (24); A longitudinally penetrating step hole (48) is provided at the middle of each positioning block (9), which is biased toward one side of the knife-releasing arc surface (47); A positioning pin (15) is longitudinally provided in the stepped hole (48); The diameter of the openings on the opposite sides of the two stepped holes (48) is larger than the diameter of the openings on the opposite sides; A cover plate boss (51) is provided at the middle position of each cover plate (14); A positioning pin mounting hole (50) is provided at the center of the cover plate boss (51); A cover plate boss (51) is located in the step hole (48); The two ends of the positioning pin (15) respectively have a positioning end (53) and a guide end (52); The positioning end (53) and the guide end (52) are located on the same central axis; The guide end (52) of the positioning pin (15) is slidably engaged with the small end of the stepped hole (48); The positioning end (53) of the positioning pin (15) is located in the positioning pin mounting hole (50) on the cover plate boss (51); The outer wall of the guide end (52) is sleeved with a spring; A clamping platform (54) is provided in the middle of the positioning pin (15).

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