Positioning clamp

Abstract

The utility model discloses a positioning clamp, which relates to the technical field of piston processing, and specifically comprises a base, a rotating seat, a mounting seat and a lever cylinder, the rotating seat is arranged on the top surface of the base; the mounting base penetrates through the rotating base and is rotationally connected with the base, the rotating base can rotate relative to the mounting base, and the end, away from the base, of the mounting base is used for mounting a to-be-machined workpiece; the lever cylinder is installed on the side, away from the base, of the rotating base and used for pressing the workpiece to be machined. The workpiece to be machined comprises the piston, through the arrangement, the mounting base can drive the piston to rotate, after the piston rotates to the preset position, the piston is pressed through the lever cylinder, the piston can rotate along with the rotating base, and after the inclined oil hole in one side of the piston is assembled, the rotating angle of the piston can be adjusted only by rotating the rotating base; and the piston does not need to be taken down in the drilling process, so that the production efficiency of the drilling procedure of the inclined oil hole of the piston can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of piston processing, in particular to a positioning fixture. Background Art

[0002] Pistons are core components of engines, and drilling inclined oil holes is a crucial process in piston machining. Some pistons require symmetrically drilled oblique oil holes on both sides. During this drilling process, the piston is typically fixed to the machine tool. After one hole is drilled, the piston is removed, rotated 180 degrees, and re-fixed to the machine tool before the next hole is drilled. This repeated removal and repositioning of the piston results in low processing efficiency.

[0003] In view of this, it is necessary to provide a positioning fixture to solve or at least alleviate the above technical problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a positioning fixture, aiming to solve the problem of low processing efficiency in the drilling process of the inclined oil hole of the piston.

[0005] To achieve the above-mentioned purpose, the present invention provides a positioning fixture, comprising:

[0006] base;

[0007] A rotating seat, the rotating seat being arranged on the top surface of the base;

[0008] A mounting seat, the mounting seat passing through the rotating seat and being rotatably connected to the base, the rotating seat being rotatable relative to the mounting seat, and an end of the mounting seat away from the base being used for mounting the workpiece to be processed;

[0009] A lever cylinder is installed on a side of the rotating seat away from the base, and is used to press the workpiece to be processed.

[0010] In one embodiment, the base is provided with a bottom through hole and at least two positioning holes, the mounting seat is rotatably connected to the base through the bottom through hole, and the distances from at least two of the positioning holes to the center of the bottom through hole are equal;

[0011] The rotating seat is provided with a fixing hole, and the fixing hole is used to be arranged corresponding to at least part of the positioning hole;

[0012] The positioning fixture further includes a positioning pin, which passes through the fixing hole and is inserted into the positioning hole corresponding to the fixing hole to limit the rotation of the rotating seat.

[0013] In one embodiment, the number of the fixing holes is two, a connecting line of the centers of the two fixing holes intersects with the central axis of the bottom through hole, and the two fixing holes are arranged corresponding to at least part of the positioning holes;

[0014] There are two positioning pins, and the positioning pins are arranged in a one-to-one correspondence with the fixing holes.

[0015] In one embodiment, the rotating seat includes a rotating plate and a center bearing, the rotating plate is provided with a center through hole and the fixing hole, the outer circumferential surface of the center bearing is fitted with the inner circumferential surface of the center through hole, and the mounting seat is connected to the base through the center bearing.

[0016] In one embodiment, the base includes a locking piece and a bottom plate, the bottom plate is provided with the bottom through hole and the positioning hole, one end of the mounting seat is passed through the bottom through hole and connected to the locking piece, the locking piece rotates synchronously with the mounting seat, and the first projection of the locking piece projected on the bottom plate is circular, and the diameter of the first projection is larger than the diameter of the bottom through hole.

[0017] In one embodiment, the locking member includes a protruding portion and a limiting portion, both of which are cylindrical, the diameter of the protruding portion is smaller than the diameter of the limiting portion, and the protruding portion is provided on a side of the limiting portion close to the bottom plate;

[0018] The positioning fixture also includes a bottom bearing, which is coaxially arranged with the bottom through hole and arranged between the base and the locking member, and the outer side surface of the protrusion is fitted with the inner side surface of the bottom bearing.

[0019] In one embodiment, the mounting base includes a positioning platform, a center platform, an elastic member, and a pin shaft. The positioning platform passes through the rotating base and is rotatably connected to the base. The positioning platform is provided with an accommodating cavity and a first opening communicating with the accommodating cavity, and the first opening is provided away from the base.

[0020] The center platform is installed in the accommodating cavity through the first opening, and one end of the elastic member abuts against the positioning platform, and the other end abuts against the center platform;

[0021] One of the side walls of the positioning platform and the side walls of the center platform is provided with an oblong hole, and the other is provided with a through hole. The through hole is arranged corresponding to the oblong hole, and the pin shaft is passed through the oblong hole and the through hole.

[0022] In one embodiment, the positioning platform includes an axial positioning portion and a planar positioning portion, the axial positioning portion passes through the rotating seat and is rotatably connected to the base, the planar positioning portion is provided at an end of the axial positioning portion away from the base, the planar positioning portion and the axial positioning portion are projected on the base as concentric circles, and the diameter of the projection of the planar positioning portion is larger than the diameter of the projection of the axial positioning portion;

[0023] The center platform includes a mounting portion and a connecting portion, the top of the mounting portion is used to mount the workpiece to be processed, the connecting portion is arranged at one end of the mounting portion close to the base, the connecting portion is provided with a cylindrical cavity and a second opening connected to the cylindrical cavity, the second opening is arranged toward the base, one end of the elastic member is installed in the cylindrical cavity through the second opening, and the other end abuts against the bottom wall of the axial positioning portion.

[0024] In one embodiment, the lever cylinder includes a cylinder body and a lever, wherein the cylinder body is mounted on a side of the rotating seat away from the base, and the cylinder body includes a telescopic rod, one end of the lever is connected to the telescopic rod, and the other end compresses or releases the workpiece as the telescopic rod is extended or retracted;

[0025] There are two lever cylinders, which are arranged opposite to each other.

[0026] In one embodiment, the positioning fixture further includes a plane plate, the base is tiltedly arranged on the plane plate, and the plane plate is provided with a fixing port, and the fixing port is used for connecting to a machine tool.

[0027] In the technical solution provided by the present invention, the positioning fixture specifically includes a base, a rotating base, a mounting base, and a lever cylinder, wherein the rotating base is arranged on the top surface of the base; the mounting base is rotatably connected to the base through the rotating base, and the rotating base can rotate around the mounting base. The end of the mounting base away from the base is used to mount the workpiece to be processed; the lever cylinder is installed on the side of the rotating base away from the base, and the lever cylinder is used to press the workpiece to be processed. The workpiece to be processed can be a piston. Through this arrangement, the piston can be installed on the mounting base, and the mounting base can drive the piston to rotate. After the piston is rotated to a preset position, the piston is pressed by the lever cylinder so that the piston can rotate with the rotating base. After the inclined oil hole on one side of the piston is installed, the rotation angle of the piston can be adjusted by simply rotating the rotating base. During the drilling process, there is no need to remove the piston. The rotation position of the piston can be adjusted by simply rotating the rotating base or the mounting base as needed. The operation is flexible and is conducive to improving the production efficiency of the piston inclined oil hole drilling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of an embodiment of a positioning fixture provided by the present invention when connected to a workpiece to be processed;

[0030] Figure 2 for Figure 1 A structural diagram from another perspective;

[0031] Figure 3 This is an exploded schematic diagram of an embodiment of a positioning fixture provided by the utility model;

[0032] Figure 4 A partial structural diagram of an embodiment of a positioning fixture provided by the present utility model;

[0033] Figure 5 for Figure 4 A structural diagram from another perspective;

[0034] Figure 6 This is an exploded schematic diagram of a portion of the structure of an embodiment of a positioning fixture provided by the present invention;

[0035] Figure 7 This is an exploded schematic diagram of a mounting base in an embodiment of a positioning fixture provided by the present invention;

[0036] Figure 8 This is another exploded schematic diagram of the mounting seat in one embodiment of the positioning fixture provided by the utility model.

[0037] 100. Positioning fixture;

[0038] 1. Base; 11. Bottom plate; 111. Positioning hole; 112. Bottom through hole; 12. Locking member; 121. Protrusion; 122. Limiting portion; 13. Bottom bearing;

[0039] 2. Rotating seat; 21. Rotating plate; 211. Fixing hole; 212. Center through hole; 22. Center bearing;

[0040] 3. Mounting seat; 31. Positioning platform; 311. Axial positioning portion; 312. Planar positioning portion; 313. Through hole; 314. Accommodating cavity; 32. Center platform; 321. Mounting portion; 322. Connecting portion; 323. Oblong hole; 324. Cylindrical cavity; 33. Elastic member; 34. Pin;

[0041] 4. Lever cylinder;

[0042] 5. Positioning pin;

[0043] 6. Flat panel; 61. Fixing port;

[0044] 200. Parts to be processed.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The piston is one of the core components of the engine. Its repetitive movement within the cylinder converts the thermal energy of the fuel into mechanical energy, which is then transferred to the crankshaft via the connecting rod, thereby driving the vehicle. As global automobile production increases, the demand for pistons is also gradually increasing.

[0050] In the production process of the piston, after the surface treatment process of the piston is completed, it is necessary to perform an oblique oil hole drilling process, that is, drilling oblique oil holes at preset positions on both sides of the piston. According to the applicant's observation and research, in this process, since the traditional operation method is to clamp the piston on the processing platform and then use a drilling rig to drill holes, after drilling on one side is completed, the piston needs to be removed and rotated. After rotating to another preset position, the piston is clamped on the processing platform for drilling. This operation requires repeatedly removing the piston to adjust the position, which will lead to low production efficiency of the oblique oil hole drilling process in piston processing.

[0051] In view of this, the present invention proposes a positioning fixture to solve the above technical problems.

[0052] See also Figures 1 to 3 In one embodiment of the present utility model, the positioning fixture 100 includes a base 1, a rotating base 2, a mounting base 3 and a lever cylinder 4, wherein the rotating base 2 is arranged on the top surface of the base 1; the mounting base 3 is rotatably connected to the base 1 through the rotating base 2, and the rotating base 2 can rotate relative to the mounting base 3. The end of the mounting base 3 away from the base 1 is used to mount the workpiece 200 to be processed; the lever cylinder 4 is installed on the side of the rotating base 2 away from the base 1, and the lever cylinder 4 is used to press the workpiece 200 to be processed.

[0053] Specifically, the workpiece 200 to be processed includes a piston. When drilling an oblique oil hole in the workpiece 200, the workpiece 200 to be processed is placed on the top of the mounting seat 3. The rotation position of the workpiece 200 to be processed is adjusted by rotating the rotating seat 2 until the workpiece 200 to be processed is rotated to the first preset position. The workpiece 200 to be processed is pressed by the lever cylinder 4 so that the workpiece 200 to be processed can remain stable during the drilling of the oblique oil hole. Since the workpiece 200 to be processed is pressed by the lever cylinder 4, and the lever cylinder 4 is installed on the rotating seat 2, the workpiece 200 to be processed can rotate synchronously with the rotating seat 2 at this time; after the oblique oil hole is drilled in the first preset position by the drilling equipment, the rotating seat 2 is rotated to change the position of the workpiece 200 facing the drilling equipment. When the rotating seat 2 drives the workpiece 200 to rotate to the second preset position, the drilling equipment starts to drill another oblique oil hole. Among them, the first preset position and the second preset position are determined according to the position where the oblique oil hole needs to be drilled in the workpiece 200 to be processed. The lever cylinder 4 includes one of a lever air cylinder and a lever electric cylinder. The lever cylinder 4 is composed of a telescopic cylinder and a lever connected to the telescopic end of the telescopic cylinder. The middle part of the lever is rotatably connected to a fulcrum. When the telescopic end is extended, the end of the lever away from the telescopic cylinder is pressed downward. When the telescopic end is retracted, the end of the lever away from the telescopic cylinder is lifted up, thereby pressing or loosening the workpiece 200 to be processed. It should be noted that the overall shape of the mounting seat 3 is a double-cylinder structure composed of two cylinders coaxially spliced together. A part of the mounting seat 3 passes through the rotating seat 2 and is rotatably connected to the base 1. The diameter of the part of the mounting seat 3 away from the base 1 is larger than the diameter of the remaining part. The bottom surface of this part abuts against the top surface of the rotating seat 2, so that after the workpiece 200 to be processed is installed on the mounting seat 3, when the lever cylinder 4 presses the workpiece 200 to be processed, the mounting seat 3 will not undergo axial displacement.

[0054] In the technical solution provided by the present invention, the positioning fixture 100 is used to place the workpiece 200 to be processed, which specifically includes a base 1, a rotating base 2, a mounting base 3 and a lever cylinder 4, wherein the rotating base 2 is arranged on the top surface of the base 1; the mounting base 3 is rotatably connected to the base 1 through the rotating base 2, and the rotating base 2 can rotate relative to the mounting base 3, and the end of the mounting base 3 away from the base 1 is used to install the workpiece 200 to be processed; the lever cylinder 4 is installed on the side of the rotating base 2 away from the base 1, and the lever cylinder 4 is used to press the workpiece 200 to be processed. The workpiece 200 to be processed includes a piston. Through this arrangement, the workpiece 200 to be processed can be installed on the mounting seat 3, and the mounting seat 3 can drive the workpiece 200 to be processed to rotate. After the workpiece 200 to be processed is rotated to a preset position, the workpiece 200 to be processed is pressed by the lever cylinder 4 so that the workpiece 200 to be processed can rotate with the rotating seat 2. After the inclined oil hole on one side of the workpiece 200 to be processed is installed, the rotation angle of the workpiece 200 to be processed can be adjusted by rotating the rotating seat 2. During the drilling process, there is no need to remove the workpiece 200. The rotation position of the workpiece 200 to be processed can be adjusted by rotating the rotating seat 2 or the mounting seat 3 as needed. The operation is flexible, which is conducive to improving the production efficiency of the inclined oil hole drilling process of the workpiece 200 to be processed.

[0055] Furthermore, in one embodiment of the present invention, the base 1 is provided with a bottom through hole 112 and at least two positioning holes 111. The mounting base 3 is rotatably connected to the base 1 through the bottom through hole 112. The distances between the at least two positioning holes 111 and the center of the bottom through hole 112 are equal. The rotating base 2 is provided with a fixing hole 211, which is used to correspond to at least some of the positioning holes 111. The positioning fixture 100 also includes a positioning pin 5, which passes through the fixing hole 211 and is inserted into the positioning hole 111 corresponding to the fixing hole 211 to limit the rotation of the rotating base 2. For details, please refer to Figures 4 to 6At least two positioning holes 111 are provided on the base 1, and the positioning holes 111 are used to provide sockets for the positioning pins 5 to limit the rotation of the rotating base 2 set on the top surface of the base 1. The part of the mounting base 3 that passes through the rotating base 2 and is rotatably connected to the base 1 is cylindrical, and the bottom end of the part is passed through the bottom through hole 112, and the part is coaxially arranged with the bottom through hole 112; the rotating base 2 can rotate around the central axis of the mounting base 3, and the distance from each positioning hole 111 to the central axis of the mounting base 3 is equal, and the central angle of the line connecting the two adjacent positioning holes 111 and the central axis of the mounting base 3 should be the same as the processing angle between the two adjacent oblique oil holes of the workpiece 200 to be processed. For example, if the angle between the two adjacent oblique oil holes of the workpiece 200 to be processed is 60 degrees, then the central angle between the two adjacent positioning holes 111 on the rotating base 2 and the central axis of the mounting base 3 should also be 60 degrees. By inserting the positioning pin 5 into the fixing hole 211 and the positioning hole 111 , the rotation of the rotating seat 2 is restricted. At this time, the drilling process of the workpiece 200 will be more stable, which is conducive to improving the drilling accuracy.

[0056] Furthermore, in one embodiment of the present invention, there are two fixing holes 211, the connecting line of the centers of the two fixing holes 211 intersects the central axis of the bottom through hole 112, and the two fixing holes 211 are arranged correspondingly to at least part of the positioning holes 111; there are two positioning pins 5, and the positioning pins 5 are arranged one-to-one in correspondence with the fixing holes 211. Figures 4 to 6 , Normally, the workpiece 200 to be processed is drilled with two oblique oil holes, and the angle formed between the two oblique oil holes and the central axis of the workpiece 200 to be processed is 180 degrees. In order to further improve production efficiency, the number of fixing holes 211 is set to two, and the angle formed between the line connecting the centers of the two fixing holes 211 and the central axis of the bottom through hole 112 is 180 degrees. Correspondingly, the positioning holes 111 are arranged in pairs on the base 1, and the angle formed between the center line of each pair of positioning holes 111 and the central axis of the bottom through hole 112 is 180 degrees. With this arrangement, when the workpiece 200 to be processed needs to be rotated 180 degrees, it is only necessary to pull out the two positioning pins 5 from the positioning holes 111, and after the rotating base 2 is rotated 180 degrees, the positioning pins 5 are reinserted into the two positioning holes 111 corresponding to the two fixing holes 211 at this time, thereby achieving the purpose of rotating the workpiece 200 to be processed 180 degrees. In addition, by adopting two positioning pins 5, the rotating seat 2 is more stable when being fixed, which is beneficial to improving the drilling accuracy when drilling the oblique oil hole in the workpiece 200 to be processed.

[0057] In one embodiment of the present invention, the rotating base 2 includes a rotating plate 21 and a central bearing 22. The rotating plate 21 is provided with a central through hole 212 and a fixing hole 211. The outer circumference of the central bearing 22 is fitted with the inner circumference of the central through hole 212. The mounting base 3 is connected to the base 1 through the central bearing 22. Figure 3 and Figure 6 To facilitate the rotation of the mounting base 3, a central through-hole 212 is defined between the rotating plates 21, while the positioning pins 5 limit the rotation of the rotating base 2. A central bearing 22, comprised of either a sliding bearing or a ball bearing, is mounted between the inner wall of the central through-hole 212 and the mounting base 3. This arrangement facilitates relative rotation between the mounting base 3 and the rotating base 2, allowing for faster rotation of the mounting base 3. This facilitates quick adjustment of the angle of the workpiece 200 after it is mounted on the mounting base 3.

[0058] In one embodiment of the present invention, the base 1 includes a locking member 12 and a bottom plate 11. The bottom plate 11 is provided with a bottom through hole 112 and a positioning hole 111. One end of the mounting base 3 is passed through the bottom through hole 112 and connected to the locking member 12. The locking member 12 rotates synchronously with the mounting base 3. The first projection of the locking member 12 on the bottom plate 11 is circular, and the diameter of the first projection is larger than the diameter of the bottom through hole 112. Figure 3 、 Figure 5 and Figure 6 A bottom through-hole 112 is formed in the bottom plate 11 to allow the bottom of the mounting seat 3 to pass through. The locking member 12 is connected to the bottom of the mounting seat 3 by bolts, welding, or even gluing. The locking member 12 projects a circular shape onto the bottom plate 11. The central axis of the bottom through-hole 112 passes through the center of this projection, and the diameter of this projection is larger than the diameter of the bottom through-hole 112. By connecting the mounting seat 3 and the locking member 12, a clamping space is formed between the mounting seat 3 and the locking member 12. This clamping space clamps the rotating plate 21 and the bottom plate 11, forming a unified clamping device and preventing loose connections between the components.

[0059] Furthermore, in one embodiment of the present invention, the locking member 12 includes a protrusion 121 and a limiting portion 122. Both the protrusion 121 and the limiting portion 122 are cylindrical. The diameter of the protrusion 121 is smaller than that of the limiting portion 122. The protrusion 121 is arranged on the side of the limiting portion 122 close to the bottom plate 11. The positioning fixture 100 also includes a bottom bearing 13. The bottom bearing 13 is coaxially arranged with the bottom through hole 112 and is arranged between the base 1 and the locking member 12. The outer side surface of the protrusion 121 is arranged in contact with the inner side surface of the bottom bearing 13. For details, please refer to Figure 3 and Figure 5In order to prevent the connection between the locking member 12 and the mounting seat 3 from becoming loose, the locking member 12 and the mounting seat 3 need to rotate synchronously. To make the rotation process of the locking member 12 smoother, a bottom bearing 13 is installed between the locking member 12 and the base plate 11. The bottom bearing 13 includes one of a ball bearing and an angular contact bearing. The bottom bearing 13 is installed on the side of the base plate 11 close to the locking member 12. The protrusion 121 of the locking member 12 extends into the hole of the bottom bearing 13. The size of the limiting portion 122 of the locking member 12 is larger than the diameter of the circular hole on the inner side of the bottom bearing 13. Through this arrangement, the locking member 12 can rotate more smoothly when following the mounting seat 3, and the loose connection between the locking member 12 and the mounting seat 3 can be avoided.

[0060] See also Figure 3 、 Figure 7 and Figure 8 In one embodiment of the present invention, the mounting base 3 includes a positioning platform 31, a center platform 32, an elastic member 33 and a pin 34. The positioning platform 31 passes through the rotating base 2 and is rotatably connected to the base 1. The positioning platform 31 is provided with a accommodating cavity 314 and a first opening connected to the accommodating cavity 314, and the first opening is arranged away from the base 1; the center platform 32 passes through the first opening and is installed in the accommodating cavity 314, and one end of the elastic member 33 abuts against the positioning platform 31, and the other end abuts against the center platform 32; one of the side walls of the positioning platform 31 and the side walls of the center platform 32 is provided with an oblong hole 323, and the other is provided with a through hole 313, and the through hole 313 is provided corresponding to the oblong hole 323, and the pin 34 is passed through the oblong hole 323 and the through hole 313. Specifically, the mounting base 3 mainly includes two parts, the positioning platform 31 and the center platform 32. The two parts are connected by the pin 34, so that the positioning platform 31 and the center platform 32 can rotate synchronously. Please refer to Figure 7The cam 33 is pressed against the top of the workpiece 314 so that the workpiece 312 can be moved in a forward direction and the workpiece 313 can be moved in a reverse direction so that the workpiece 312 can be moved in a reverse direction so that the workpiece 312 can be moved in a reverse direction. At the same time, since the centering platform 32 can be axially displaced within a certain range, the centering platform 32 can be adapted to various types of workpieces 200 to be processed, thereby increasing the applicability of the positioning fixture 100 of this embodiment. In other embodiments, the oblong hole 323 is provided on the side wall of the positioning platform 31, and the through hole 313 is provided on the side wall of the centering platform 32.

[0061] Furthermore, in one embodiment of the present invention, the positioning platform 31 includes an axial positioning portion 311 and a planar positioning portion 312. The axial positioning portion 311 passes through the rotating seat 2 and is rotatably connected to the base 1. The planar positioning portion 312 is arranged at the end of the axial positioning portion 311 away from the base 1. The projections of the planar positioning portion 312 and the axial positioning portion 311 on the base 1 are concentric circles, and the diameter of the projection of the planar positioning portion 312 is larger than the diameter of the projection of the axial positioning portion 311. The center platform 32 includes a mounting portion 321 and a connecting portion 322. The top of the mounting portion 321 is used to mount the workpiece 200 to be processed. The connecting portion 322 is arranged at the end of the mounting portion 321 close to the base 1. The connecting portion 322 is provided with a cylindrical cavity 324 and a second opening connected to the cylindrical cavity 324. The second opening is arranged toward the base 1. One end of the elastic member 33 passes through the second opening and is installed in the cylindrical cavity 324, and the other end abuts against the bottom wall of the axial positioning portion 311. Please refer to Figure 7 and Figure 8The axial positioning portion 311 is used to pass through the central through hole 212 of the rotating seat 2 and the bottom through hole 112 of the base 1 to limit the movement of the positioning platform 31 in the plane direction of the rotating seat 2. The overall shape of the plane positioning portion 312 and the axis positioning portion 311 is cylindrical. The radial dimension of the plane positioning portion 312 is larger than the radial dimension of the axial positioning portion 311, which is used to match the size of the workpiece 200 to be processed. The smaller diameter of the axial positioning portion 311 is also conducive to reducing the friction between the axial positioning portion 311 and the base 1, which facilitates the rotation of the positioning platform 31. The center platform 32 is entirely accommodated in the positioning platform 31. The connecting portion 322 of the center platform 32 is used to abut against the elastic member 33. The diameter of the connecting portion 322 of the center platform 32 is smaller than the diameter of the mounting portion 321, so that the workpiece 200 to be processed can be installed on the top of the mounting portion 321. The connecting portion 322 of the centering platform 32 is accommodated in the inner cavity formed by the axial positioning portion 311 of the positioning platform 31. The mounting portion 321 of the centering platform 32 is accommodated in the inner cavity formed by the planar positioning portion 312 of the positioning platform 31. The outer side surface of the mounting portion 321 is arranged to abut against the inner side surface of the planar positioning portion 312, thereby limiting the radial displacement of the centering platform 32. At the same time, a portion of the elastic member 33 is disposed in the accommodating cavity 314. The elastic member 33 disposed in the accommodating cavity 314 abuts against the bottom wall of the accommodating cavity 314. A cylindrical cavity 324 is formed within the connecting portion 322 of the centering platform 32. Another portion of the elastic member 33 is disposed in the cylindrical cavity 324. The end of this portion abuts against the top wall of the cylindrical cavity 324, preventing the elastic member 33 from bending. This arrangement limits the radial displacement of the elastic member 33, thereby enabling the elastic member 33 to provide a stable elastic support force to the centering platform 32, thereby improving the installation stability of the workpiece 200 to be processed.

[0062] In one embodiment of the present invention, the lever cylinder 4 includes a cylinder body and a lever. The cylinder body is installed on the side of the rotating seat away from the base. The cylinder body includes a telescopic rod. One end of the lever is connected to the telescopic rod, and the other end compresses or releases the workpiece 200 as the telescopic rod is extended or retracted. Two lever cylinders 4 are provided, and the two lever cylinders 4 are arranged opposite each other. Figures 1 to 3 The two lever cylinders 4 are symmetrically arranged along a central axis plane of the mounting base 3, so that both sides of the workpiece 200 can be pressed tightly, avoiding the shaking of the workpiece 200 after installation caused by uneven force on both sides of the workpiece 200. This arrangement can improve the processing stability of the workpiece 200 and is conducive to improving the accuracy of drilling inclined oil holes.

[0063] In one embodiment of the present invention, the positioning fixture 100 further includes a flat plate 6, the base 1 is tiltedly disposed on the flat plate 6, and the flat plate 6 defines a fixing opening 61 for connecting to a machine tool. Figures 1 to 3The flat plate 6 is mounted on the machine tool through the fixing port 61. The bottom plate 11 in the base 1 is connected to the flat plate 6 at an angle. The specific angle of inclination needs to be determined according to the drilling angle of the inclined oil hole on the workpiece 200 to be processed. By setting the inclination between the bottom plate 11 and the flat plate 6, the drilling equipment does not need to be tilted. It only needs to be mounted horizontally on the machine tool to carry out the drilling process of the inclined oil hole, avoiding frequent adjustment of the installation angle of the drilling equipment.

[0064] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A positioning fixture, characterized in that: include: base; A rotating seat, the rotating seat being arranged on the top surface of the base; A mounting seat, the mounting seat passing through the rotating seat and being rotatably connected to the base, the rotating seat being rotatable relative to the mounting seat, and the end of the mounting seat away from the base being used for mounting a workpiece to be processed; A lever cylinder is installed on a side of the rotating seat away from the base, and is used to press the workpiece to be processed.

2. The positioning fixture according to claim 1, characterized in that: The base is provided with a bottom through hole and at least two positioning holes, the mounting seat is rotatably connected to the base through the bottom through hole, and the distances from at least two of the positioning holes to the center of the bottom through hole are equal; The rotating seat is provided with a fixing hole, and the fixing hole is used to be arranged corresponding to at least part of the positioning hole; The positioning fixture further includes a positioning pin, which passes through the fixing hole and is inserted into the positioning hole corresponding to the fixing hole to limit the rotation of the rotating seat.

3. The positioning fixture according to claim 2, characterized in that: There are two fixing holes, a connecting line between the centers of the two fixing holes intersects with the central axis of the bottom through hole, and the two fixing holes are arranged corresponding to at least part of the positioning holes; There are two positioning pins, and the positioning pins are arranged in a one-to-one correspondence with the fixing holes.

4. The positioning fixture according to claim 2, characterized in that: The rotating seat includes a rotating plate and a central bearing. The rotating plate is provided with a central through hole and the fixing hole. The outer circumference of the central bearing is fitted with the inner circumference of the central through hole. The mounting seat is connected to the base through the central bearing.

5. The positioning fixture according to claim 2, wherein: The base includes a locking piece and a bottom plate, the bottom plate is provided with the bottom through hole and the positioning hole, one end of the mounting seat is passed through the bottom through hole and connected to the locking piece, the locking piece rotates synchronously with the mounting seat, and the first projection of the locking piece projected on the bottom plate is circular, and the diameter of the first projection is larger than the diameter of the bottom through hole.

6. The positioning fixture according to claim 5, characterized in that: The locking member includes a protruding portion and a limiting portion, both of which are cylindrical, the diameter of the protruding portion is smaller than the diameter of the limiting portion, and the protruding portion is arranged on a side of the limiting portion close to the bottom plate; The positioning fixture also includes a bottom bearing, which is coaxially arranged with the bottom through hole and arranged between the base and the locking member, and the outer side surface of the protrusion is fitted with the inner side surface of the bottom bearing.

7. The positioning fixture according to claim 1, wherein: The mounting base includes a positioning platform, a center platform, an elastic member and a pin shaft. The positioning platform passes through the rotating base and is rotatably connected to the base. The positioning platform is provided with an accommodating cavity and a first opening communicating with the accommodating cavity, and the first opening is arranged away from the base. The center platform is installed in the accommodating cavity through the first opening, and one end of the elastic member abuts against the positioning platform, and the other end abuts against the center platform; One of the side walls of the positioning platform and the side walls of the center platform is provided with an oblong hole, and the other is provided with a through hole. The through hole is arranged corresponding to the oblong hole, and the pin shaft is passed through the oblong hole and the through hole.

8. The positioning fixture according to claim 7, wherein: The positioning platform includes an axial positioning portion and a planar positioning portion, the axial positioning portion passes through the rotating seat and is rotatably connected to the base, the planar positioning portion is provided at one end of the axial positioning portion away from the base, the projections of the planar positioning portion and the axial positioning portion on the base are concentric circles, and the diameter of the projection of the planar positioning portion is larger than the diameter of the projection of the axial positioning portion; The center platform includes a mounting portion and a connecting portion, the top of the mounting portion is used to mount the workpiece to be processed, the connecting portion is arranged at one end of the mounting portion close to the base, the connecting portion is provided with a cylindrical cavity and a second opening connected to the cylindrical cavity, the second opening is arranged toward the base, one end of the elastic member is installed in the cylindrical cavity through the second opening, and the other end abuts against the bottom wall of the axial positioning portion.

9. The positioning fixture according to claim 1, wherein: The lever cylinder includes a cylinder body and a lever. The cylinder body is installed on a side of the rotating seat away from the base. The cylinder body includes a telescopic rod. One end of the lever is connected to the telescopic rod, and the other end compresses or releases the workpiece as the telescopic rod is extended or retracted. There are two lever cylinders, which are arranged opposite to each other.

10. The positioning fixture according to claim 1, wherein: The positioning fixture further comprises a plane plate, the base is tiltedly arranged on the plane plate, and the plane plate is provided with a fixing opening, and the fixing opening is used for connecting with a machine tool.

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