Positioning device and method suitable for special inner hole part

Abstract

The invention provides a positioning device and method suitable for parts with special inner bores, a positioning seat is fixedly mounted in the center of the top of a base, a positioning steel ball is movably mounted on the positioning seat through a steel ball mounting hole, a support is fixed on the periphery of the positioning seat, and a hook-shaped pressing plate is rotatably mounted on a lug of the support through a supporting shaft. The bottom end of the hook-shaped pressing plate is movably matched with the top end of the guide column, the guide column is installed on the base in a sliding mode, the bottom end of the guide column is matched with a ball head of the ball connecting rod, the tail end of the ball connecting rod is connected with the connecting plate in a matched mode through the locating pin shaft, and the connecting plate is fixedly installed on the locating shaft. When the positioning shaft moves downwards, the positioning steel ball moves outwards in the radial direction to position an inner hole in the middle of a part, meanwhile, when the positioning shaft moves downwards, the connecting plate series part drives the hook-shaped pressing plate to rotate around the supporting shaft, and after the positioning steel ball enters the straight face of the positioning shaft to position the part, the hook-shaped pressing plate tightly presses the part.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a positioning device and method suitable for special inner hole parts. Background Art

[0002] Usually, when locating parts with small inner holes at both ends and large in the middle, the large middle hole is needed for positioning. There is no suitable method for positioning and clamping, and the only way to locate is by datum conversion, such as using the outer circle of the part or the small holes at both ends for positioning. Such datum conversion will produce certain clamping errors. At the same time, the inconsistency between the design datum and the clamping datum will have a great impact on the final processing accuracy of the part, directly reducing the accuracy of the finished product of the part. Summary of the invention

[0003] The purpose of the present invention is to provide a positioning device and method suitable for special inner hole parts. When the positioning shaft moves downward, the positioning steel ball will gradually transition from the conical surface contact of the positioning shaft to the straight surface contact with the positioning shaft. At the same time, the positioning steel ball moves radially outward to position the inner hole in the middle of the part. At the same time, when the positioning shaft moves downward, the hook-shaped pressure plate is driven to rotate around the supporting shaft through the connecting plate series parts. After the positioning steel ball enters the straight surface of the positioning shaft to position the part, the hook-shaped pressure plate presses the part. The entire positioning device is easy to use, more accurate, and more efficient.

[0004] In order to realize the above-mentioned technical features, the purpose of the present invention is realized as follows: a positioning device suitable for special inner hole parts comprises a base, a positioning seat is fixedly installed on the top center part of the base, a positioning steel ball is movably installed on the positioning seat through the steel ball mounting hole, a support is fixed on the periphery of the positioning seat and located on the top of the base, a hook-shaped pressure plate is rotatably installed on the ear seat of the support through a supporting shaft, the bottom end of the hook-shaped pressure plate forms a movable fit with the top end of the guide column, the guide column is slidably installed on the base, the bottom end of the guide column cooperates with the ball head of the ball joint rod, the tail end of the ball joint rod is connected with the connecting plate through a positioning pin shaft, the connecting plate is fixedly installed on the positioning shaft, and the upper part of the positioning shaft passes through the positioning seat and cooperates with the positioning steel ball.

[0005] The positioning seat includes an annular seat body, an upper positioning cylinder is arranged at the top center of the annular seat body, and steel ball mounting holes are evenly processed at a certain height and in a circumferential direction on the upper positioning cylinder; a lower positioning cylinder is arranged at the bottom center of the annular seat body, a center hole is arranged at the center of the annular seat body, and first bolt stepped holes are evenly processed on the annular seat body; and a plurality of arc-shaped notches are processed on the outer wall of the annular seat body.

[0006] The positioning seat is fixedly connected to the base through a first bolt installed on the first bolt stepped hole; the lower positioning cylinder is positioned and matched with the central positioning hole of the base; the end of the steel ball installation hole adopts a tapered hole to prevent the positioning steel ball from falling off.

[0007] During clamping, the positioning steel ball is tightly matched with the inner hole of the part.

[0008] The top of the positioning shaft is a top cylindrical section, which cooperates with the upper positioning cylinder and tightens the positioning steel ball; the lower part of the top cylindrical section is transitionally connected to a conical section, and the lower part of the conical section is transitionally connected to a middle cylindrical section, and the middle cylindrical section forms a sliding fit with the center hole; the lower part of the middle cylindrical section is filtered and connected to a first threaded section, and the first threaded section is used to install a connecting plate; the lower part of the first threaded section is transitionally connected to a second threaded section, and the second threaded section is used to be connected to a power device that provides vertical power.

[0009] The support includes a support body, a plurality of ear seats are evenly arranged on the top of the support body, a pin hole is processed on the ear seat, the pin hole matches with the supporting shaft, a plurality of second bolt stepped holes are processed on the support body, and a support positioning stepped hole is processed on the bottom end of the support body, and the support positioning stepped hole is positioned and matched with the base.

[0010] The support is fixedly connected to the base via a second bolt passing through a second bolt stepped hole.

[0011] The hook-shaped pressure plate includes a hook body, a through hole for installing a supporting shaft is processed on the hook body, a hook is arranged at the top of the hook body, the hook is pressed tightly against the top of the outer boss of the part, and a sliding column is arranged at the bottom of the hook body.

[0012] The guide column includes a guide column body, which forms a sliding fit with the base. The top of the guide column body is processed with a top matching hole for matching with the sliding column. The bottom end of the guide column body is a square column, and the square column is processed with a bottom matching hole for matching with the ball head of the ball joint rod.

[0013] A method for using a positioning device suitable for special inner hole parts includes the following steps: Step 1: Positioning and installation of the positioning seat: The positioning seat is fixedly installed on the base; Step 2, positioning and installation of the support: The support rail can be installed on the base; Step 3, ball joint installation: Install the ball joint into the connecting plate and position it with the locating pin; Step 4, installation of guide column: Connect the three guide posts to the ball joint rods respectively. The ball heads of the ball joint rods can move in the holes of the guide posts. The base has three holes that match the guide posts respectively. Install the three guide posts into the three holes on the base for standby use. Step 5, installation of positioning steel ball: Install the positioning steel ball into the positioning seat, put the positioning shaft into the inner hole of the positioning seat, and screw it into the thread on the connecting plate to the required position; there is a rib outside the hole for installing the positioning steel ball on the positioning seat, so that the positioning steel ball will not fall out; Step 6, installation of hook-shaped pressure plate: The ball head of the hook-shaped pressure plate is installed into the guide column and connected to the support through the support shaft. The hook-shaped pressure plate can rotate around the support shaft, and the ball head of the hook-shaped pressure plate can move in the hole of the guide column; Step 7, positioning and clamping of parts: Put the part into the positioning seat, and the positioning shaft moves downward. The positioning steel ball will gradually transition from the contact with the conical surface of the positioning shaft to the contact with the straight surface of the positioning shaft. At the same time, the positioning steel ball moves radially outward to position the inner hole in the middle of the part. At the same time, when the positioning shaft moves downward, the ball connecting rod is driven by the connecting plate, the guide column is driven by the ball connecting rod, and the hook-shaped pressure plate is driven by the guide column. The hook-shaped pressure plate rotates around the supporting shaft. After the positioning steel ball cooperates with the straight surface of the positioning shaft to position the part, the hook-shaped pressure plate presses the part tightly. Step 8, loosening of parts: On the contrary, when the locating shaft moves upward, the hook-shaped pressure plate will first loosen the part, and the locating steel ball will gradually transition from the straight surface contact with the locating shaft to the conical surface contact with the locating shaft. At the same time, the locating steel ball can move radially inward, and the part can be directly taken out.

[0014] The present invention has the following beneficial effects: 1. When the positioning shaft of the present invention moves downward, the positioning steel ball will gradually transition from the contact with the conical surface of the positioning shaft to the contact with the straight surface of the positioning shaft. At the same time, the positioning steel ball moves radially outward to position the inner hole in the middle of the part. At the same time, when the positioning shaft moves downward, the hook-shaped pressure plate is driven to rotate around the supporting shaft through the connecting plate series parts. After the positioning steel ball enters the straight surface of the positioning shaft to position the part, the hook-shaped pressure plate presses the part tightly. The entire positioning device is easy to use, more accurate, and more efficient.

[0015] 2. The positioning seat can be used to limit the positioning shaft and simultaneously install the positioning steel ball. The arc-shaped notch can be used to limit the top of the guide column later.

[0016] 3. The end of the steel ball installation hole adopts a tapered hole to prevent the positioning steel ball from falling off. The positioning seat can be reliably fixed by the first bolt.

[0017] 4. Through the above-mentioned tight fit, the inner hole positioning of the parts can be achieved, thereby realizing the coaxial arrangement of the parts.

[0018] 5. Through the cooperation between the above-mentioned tapered section and the positioning steel ball, it is ensured that the positioning shaft can gradually press the positioning steel ball during the downward pressing process, and then the positioning steel ball is axially driven and pressed. At the same time, the tapered section facilitates the subsequent loosening of the parts.

[0019] 6. The above-mentioned support can be used to rotatably install the hook-shaped pressure plate, thereby facilitating the subsequent clamping and fixing of the parts through the hook-shaped pressure plate.

[0020] 7. The second bolt mentioned above can realize reliable fixed installation of the support.

[0021] 8. The parts can be pressed tightly by the hook-shaped pressing plate.

[0022] 9. Through the guide column mentioned above, power can be transmitted from the connecting plate to the ball joint, and then from the ball joint to the guide column, and finally to the hook-shaped pressure plate through the guide column, and then the parts are pressed by the hook-shaped pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is the main sectional view of the present invention.

[0025] Figure 2 It is a partial diagram of the cooperation between the positioning steel ball and parts of the present invention.

[0026] Figure 3 It is a sectional view of parts of the present invention.

[0027] Figure 4 It is a three-dimensional diagram of the positioning seat of the present invention from the first perspective.

[0028] Figure 5 It is a three-dimensional diagram of the positioning seat of the present invention from a second viewing angle.

[0029] Figure 6 It is a three-dimensional diagram of the guide post of the present invention.

[0030] Figure 7 It is a three-dimensional diagram of the hook-shaped pressing plate of the present invention.

[0031] Figure 8 It is a three-dimensional diagram of the support of the present invention.

[0032] In the figure: base 1, positioning shaft 2, second bolt 3, positioning seat 4, positioning steel ball 5, connecting plate 6, positioning pin shaft 7, ball joint rod 8, guide column 9, first bolt 10, supporting shaft 11, support seat 12, hook-shaped pressure plate 13, part 14; Top cylindrical section 201, conical section 202, first threaded section 203, middle cylindrical section 204, second threaded section 205; Annular seat body 401, arc-shaped notch 402, first bolt stepped hole 403, upper positioning cylinder 404, steel ball mounting hole 405, lower positioning cylinder 406, center hole 407; Square column 901, bottom matching hole 902, guide column body 903, top matching hole 904; The second bolt stepped hole 1201, the support positioning stepped hole 1202, the support body 1203, the ear seat 1204, and the pin hole 1205; Sliding column 1301, through hole 1302, hook body 1303, hook 1304; Inner hole 1401 and outer boss 1402. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0034] Embodiment 1: See also Figure 1-8 A positioning device suitable for special inner hole parts includes a base 1, a positioning seat 4 is fixedly installed at the top center of the base 1, a positioning steel ball 5 is movably installed on the positioning seat 4 through a steel ball mounting hole 405, a support 12 is fixed on the periphery of the positioning seat 4 and located on the top of the base 1, a hook-shaped pressure plate 13 is rotatably installed on the ear seat 1204 of the support 12 through a supporting shaft 11, the bottom end of the hook-shaped pressure plate 13 forms a movable fit with the top end of a guide column 9, the guide column 9 is slidably installed on the base 1, the bottom end of the guide column 9 cooperates with the ball head of a ball joint rod 8, the tail end of the ball joint rod 8 is connected to a connecting plate 6 through a positioning pin shaft 7, the connecting plate 6 is fixedly installed on the positioning shaft 2, and the upper part of the positioning shaft 2 passes through the positioning seat 4 and cooperates with the positioning steel ball 5. When the positioning shaft of the present invention moves downward, the positioning steel ball will gradually transition from the conical contact of the positioning shaft to the direct contact with the positioning shaft, and at the same time, the positioning steel ball moves radially outward to position the inner hole in the middle of the part. At the same time, when the positioning shaft moves downward, the hook-shaped pressure plate is driven to rotate around the support shaft through the connecting plate series parts. After the positioning steel ball enters the direct surface of the positioning shaft to position the part, the hook-shaped pressure plate presses the part tightly; the entire positioning device is easy to use, more accurate, and more efficient. In the specific working process, an axial pulling force is generated by the positioning shaft 2, and then the positioning steel ball 5 is driven to move radially through the upper part of the positioning shaft 2, and then the part 14 is axially positioned and initially squeezed, and then the ball connecting rod 8, the guide column 9 and the hook-shaped pressure plate 13 are driven to rotate through the positioning shaft 2, and then the top edge of the part 14 is pressed, and finally the part is pressed and fixed.

[0035] Further, the positioning seat 4 includes an annular seat body 401, an upper positioning cylinder 404 is provided at the top center of the annular seat body 401, a steel ball mounting hole 405 is uniformly processed at a certain height and in a circumferential direction on the upper positioning cylinder 404, a lower positioning cylinder 406 is provided at the bottom center of the annular seat body 401, a center hole 407 is provided at the center of the annular seat body 401, and a first bolt stepped hole 403 is uniformly processed through the annular seat body 401; and a plurality of arc-shaped notches 402 are processed on the outer wall of the annular seat body 401. The positioning seat 4 described above can be used to limit the positioning shaft 2 and simultaneously cooperate with the positioning steel ball 5. The arc-shaped notch 402 can be used to limit the top of the guide column 9 later.

[0036] Furthermore, the positioning seat 4 is fixedly connected to the base 1 by the first bolt 10 installed on the first bolt stepped hole 403; the lower positioning cylinder 406 is positioned and matched with the central positioning hole of the base 1; the end of the steel ball installation hole 405 is a tapered hole to prevent the falling of the positioning steel ball 5. The positioning seat 4 can be reliably fixed by the above-mentioned first bolt 10.

[0037] Furthermore, during clamping, the positioning steel ball 5 is tightly matched with the inner hole 1401 of the part 14. Through the above-mentioned tight fit, the inner hole positioning of the part 14 can be achieved, thereby achieving the coaxial arrangement of the part 14.

[0038] Further, the top of the positioning shaft 2 is a top cylindrical section 201, which cooperates with the upper positioning cylinder 404 and fixes the positioning steel ball 5; the lower transition of the top cylindrical section 201 is connected with a conical section 202, the lower transition of the conical section 202 is connected with a middle cylindrical section 204, the middle cylindrical section 204 and the center hole 407 form a sliding fit, the lower filtering connection of the middle cylindrical section 204 is connected with a first threaded section 203, the first threaded section 203 is used to install the connecting plate 6, the lower transition of the first threaded section 203 is connected with a second threaded section 205, the second threaded section 205 is used to connect with the power device providing vertical power. Through the cooperation between the above-mentioned conical section 202 and the positioning steel ball 5, it is ensured that the positioning shaft 2 can gradually press the positioning steel ball 5 during the downward pressing process, and then the positioning steel ball 5 is axially driven and pressed, and at the same time, the conical section 202 is convenient for subsequent loosening of the parts. In addition, the top cylindrical section 201 can cooperate with the positioning steel ball 5 to thereby press the positioning steel ball 5 to achieve compression of the parts.

[0039] The above-mentioned middle cylindrical section 204 facilitates the cooperation with the positioning seat 4, thereby realizing the axial movement of the positioning shaft 2. The first threaded section 203 facilitates the rapid positioning and installation of the connecting plate 6, and facilitates the adjustment of the installation height of the connecting plate 6. The second threaded section 205 facilitates the connection with the power device, thereby realizing the axial movement of the positioning shaft.

[0040] Further, the support 12 includes a support body 1203, a plurality of ear seats 1204 are evenly arranged at the top of the support body 1203, a pin hole 1205 is processed on the ear seat 1204, the pin hole 1205 is matched with the support shaft 11, a plurality of second bolt stepped holes 1201 are processed on the support body 1203, a support positioning stepped hole 1202 is processed at the bottom of the support body 1203, and the support positioning stepped hole 1202 is positioned and matched with the base 1. The support 12 can be used to rotatably install the hook-shaped pressure plate 13, so as to facilitate the subsequent clamping and fixing of the parts through the hook-shaped pressure plate 13.

[0041] Furthermore, the support 12 is fixedly connected to the base 1 by means of the second bolt 3 passing through the second bolt stepped hole 1201. The support 12 can be reliably fixedly installed by means of the second bolt 3.

[0042] Furthermore, the hook-shaped pressing plate 13 includes a hook body 1303, on which a through hole 1302 for mounting the support shaft 11 is processed, a hook 1304 is arranged at the top of the hook body 1303, the hook 1304 is pressed against the top of the outer boss 1402 of the part 14, and a sliding column 1301 is arranged at the bottom of the hook body 1303. The part 14 can be pressed by the hook-shaped pressing plate 13.

[0043] Furthermore, the guide post 9 includes a guide post body 903, which is in sliding cooperation with the base 1, and a top cooperation hole 904 for cooperation with the sliding post 1301 is processed at the top of the guide post body 903, and a bottom cooperation hole 902 for cooperation with the ball head of the ball joint rod 8 is processed on the bottom of the guide post body 903, which is a square post 901. The power can be transmitted from the connecting plate 6 to the ball joint rod 8 through the guide post 9, and then transmitted from the ball joint rod 8 to the guide post 9, and finally transmitted to the hook-shaped pressure plate 13 through the guide post 9, and then the parts are pressed by the hook-shaped pressure plate 13.

[0044] Embodiment 2: A method for using a positioning device suitable for special inner hole parts includes the following steps: Step 1, positioning and installation of the positioning seat 4: The positioning seat 4 is fixedly installed on the base 1; Step 2: Positioning and installation of the support 12: The support 12 track can be installed on the base 1; Step 3, installation of ball joint 8: Install the ball connecting rod 8 into the connecting plate 6 and position it through the positioning pin 7; Step 4, installation of guide column 9: Connect three guide posts 9 to the ball joint rod 8 respectively. The ball head of the ball joint rod 8 can move in the hole of the guide post 9. There are three holes on the base that match the guide posts 9 respectively. Install the three guide posts 9 into the three holes on the base 1 for standby use. Step 5, installation of positioning steel ball 5: Install the positioning steel ball 5 into the positioning seat 4, and at the same time put the positioning shaft 2 into the inner hole of the positioning seat 4, and screw it into the thread on the connecting plate 6 to the required position; there is a rib outside the hole for installing the positioning steel ball 5 on the positioning seat 4, so that the positioning steel ball 5 will not fall out; Step 6, installation of hook-shaped pressing plate 13: The ball head of the hook-shaped pressing plate 13 is installed into the guide column 9 and connected to the support 12 through the support shaft 11. The hook-shaped pressing plate 13 can rotate around the support shaft 11, and the ball head of the hook-shaped pressing plate 13 can move in the hole of the guide column 9; Step 7, positioning and clamping of part 14: Put the part 14 into the positioning seat 4, the positioning shaft 2 moves downward, and the positioning steel ball 5 gradually transitions from the contact with the conical surface of the positioning shaft 2 to the contact with the straight surface of the positioning shaft, and at the same time, the positioning steel ball 5 moves radially outward to position the inner hole 1401 in the middle of the part; at the same time, when the positioning shaft 2 moves downward, the ball connecting rod 8 is driven by the connecting plate 6, the guide column 9 is driven by the ball connecting rod 8, and the hook-shaped pressing plate 13 is driven by the guide column 9, and the hook-shaped pressing plate 13 rotates around the supporting shaft 11. After the positioning steel ball 5 cooperates with the straight surface of the positioning shaft to position the part 14, the hook-shaped pressing plate 13 presses the part 14 tightly; Step 8, loosening of part 14: On the contrary, when the positioning shaft 2 moves upward, the hook-shaped pressure plate 13 first releases the part 14, and the positioning steel ball 5 gradually transitions from the straight surface contact with the positioning shaft 2 to the conical surface contact with the positioning shaft. At the same time, the positioning steel ball 5 can move radially inward, and the part can be directly taken out.

[0045] Working principle of the present invention: Usually, when locating parts with small inner holes at both ends and large in the middle, the large middle hole is needed for positioning. There is no suitable method for positioning and clamping, and the only way to locate is by datum conversion, such as using the outer circle of the part or the small holes at both ends for positioning. Such datum conversion will produce certain clamping errors. At the same time, the inconsistency between the design datum and the clamping datum will have a great impact on the final processing accuracy of the part, directly reducing the accuracy of the finished product of the part. Based on this, in order to further ensure the processing accuracy of parts, it is necessary to ensure that the clamping datum is consistent with the design datum to reduce the error caused by part clamping; therefore, the positioning device and method of the special inner hole part of the present invention are adopted, and the positioning shaft moves downward under the action of the pulling force F of the automatic cylinder, and two actions are generated. One is that the positioning steel ball gradually transitions from the conical surface contact of the positioning shaft to the direct surface contact with the positioning shaft to position the inner hole in the middle of the part, and the other is to drive the hook-shaped pressure plate to rotate around the supporting shaft through the connecting plate, the ball connecting rod, and the guide column to press the part. After the positioning steel ball enters the direct surface of the positioning shaft to position the part, the hook-shaped pressure plate presses the part; conversely, when the positioning shaft moves upward, the hook-shaped pressure plate first loosens the part, and the positioning steel ball gradually transitions from the direct surface contact with the positioning shaft to the conical surface contact with the positioning shaft, and the positioning steel ball can move radially inward at the same time, so that the part can be directly taken out; the entire positioning device is easy to use, more accurate, and more rigid.

Claims

1. A positioning device suitable for special inner hole parts, characterized in that: The invention comprises a base (1), wherein a positioning seat (4) is fixedly mounted at the top center of the base (1), a positioning steel ball (5) is movably mounted on the positioning seat (4) through a steel ball mounting hole (405), a support (12) is fixedly mounted on the periphery of the positioning seat (4) and located at the top of the base (1), a hook-shaped pressing plate (13) is rotatably mounted on the ear seat (1204) of the support (12) through a supporting shaft (11), the bottom end of the hook-shaped pressing plate (13) is movably matched with the top end of a guide column (9), the guide column (9) is slidably mounted on the base (1), the bottom end of the guide column (9) is matched with the ball head of a ball joint rod (8), the tail end of the ball joint rod (8) is matched with a connecting plate (6) through a positioning pin shaft (7), the connecting plate (6) is fixedly mounted on the positioning shaft (2), the upper part of the positioning shaft (2) passes through the positioning seat (4) and is matched with the positioning steel ball (5).

2. A positioning device suitable for special inner hole parts according to claim 1, characterized in that: The positioning seat (4) comprises an annular seat body (401), an upper positioning cylinder (404) is arranged at the top center of the annular seat body (401), a steel ball mounting hole (405) is uniformly processed at a certain height and in a circumferential direction on the upper positioning cylinder (404), a lower positioning cylinder (406) is arranged at the bottom center of the annular seat body (401), a center hole (407) is arranged at the center of the annular seat body (401), and first bolt stepped holes (403) are uniformly processed through the annular seat body (401); and a plurality of arc-shaped notches (402) are processed on the outer wall of the annular seat body (401).

3. A positioning device suitable for special inner hole parts according to claim 2, characterized in that: The positioning seat (4) is fixedly connected to the base (1) via a first bolt (10) mounted on the first bolt stepped hole (403); the lower positioning cylinder (406) is positioned and matched with the central positioning hole of the base (1); the end of the steel ball mounting hole (405) is a tapered hole to prevent the positioning steel ball (5) from falling off.

4. A positioning device suitable for special inner hole parts according to claim 3, characterized in that: During clamping, the positioning steel ball (5) is tightly fitted with the inner hole (1401) of the part (14).

5. A positioning device suitable for special inner hole parts according to claim 3, characterized in that: The top of the positioning shaft (2) is a top cylindrical section (201), which cooperates with the upper positioning tube (404) and fixes the positioning steel ball (5); the bottom of the top cylindrical section (201) is transitionally connected with a conical section (202), the bottom of the conical section (202) is transitionally connected with a middle cylindrical section (204), the middle cylindrical section (204) and the center hole (407) form a sliding fit, the bottom of the middle cylindrical section (204) is filtered and connected with a first threaded section (203), the first threaded section (203) is used to install the connecting plate (6), the bottom of the first threaded section (203) is transitionally connected with a second threaded section (205), the second threaded section (205) is used to be connected to a power device that provides vertical power.

6. A positioning device suitable for special inner hole parts according to claim 3, characterized in that: The support (12) comprises a support body (1203), a plurality of ear seats (1204) are evenly arranged at the top of the support body (1203), a pin hole (1205) is processed on the ear seat (1204), the pin hole (1205) is matched with the support shaft (11), a plurality of second bolt stepped holes (1201) are processed on the support body (1203), and a support positioning stepped hole (1202) is processed at the bottom of the support body (1203), and the support positioning stepped hole (1202) is positioned and matched with the base (1).

7. A positioning device suitable for special inner hole parts according to claim 6, characterized in that: The support (12) is fixedly connected to the base (1) via a second bolt (3) passing through a second bolt stepped hole (1201).

8. A positioning device suitable for special inner hole parts according to claim 6, characterized in that: The hook-shaped pressure plate (13) comprises a hook head body (1303), a through hole (1302) for mounting the support shaft (11) is processed on the hook head body (1303), a hook head (1304) is arranged at the top end of the hook head body (1303), the hook head (1304) is pressed against the top end of the outer boss (1402) of the part (14), and a sliding column (1301) is arranged at the bottom end of the hook head body (1303).

9. A positioning device suitable for special inner hole parts according to claim 8, characterized in that: The guide column (9) comprises a guide column body (903), the guide column body (903) and the base (1) form a sliding fit, the top end of the guide column body (903) is processed with a top matching hole (904) for matching with the sliding column (1301), and the bottom end of the guide column body (903) is a square column (901), and the square column (901) is processed with a bottom matching hole (902) for matching with the ball head of the ball joint rod (8).

10. A method for using a positioning device for special inner hole parts according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Positioning and installation of the positioning seat (4): The positioning seat (4) is fixedly mounted on the base (1); Step 2: Positioning and installation of the support (12): The support (12) track can be installed on the base (1); Step 3, installation of ball joint (8): The ball connecting rod (8) is installed into the connecting plate (6) and positioned by the positioning pin (7); Step 4, installation of guide post (9): The three guide posts (9) are connected to the ball joint rod (8) respectively, the ball head of the ball joint rod (8) can move in the hole of the guide post (9), the base has three holes respectively matched with the guide posts (9), and the three guide posts (9) are respectively installed in the three holes on the base (1) for standby use; Step 5, installation of positioning steel ball (5): Install the positioning steel ball (5) into the positioning seat (4), and at the same time, insert the positioning shaft (2) into the inner hole of the positioning seat (4), and screw it into the thread on the connecting plate (6) to the required position; a retaining edge is left outside the hole for installing the positioning steel ball (5) on the positioning seat (4), so that the positioning steel ball (5) will not fall out; Step 6, installation of hook-shaped pressure plate (13): The ball head of the hook-shaped pressure plate (13) is installed into the guide column (9) and connected to the support (12) through the support shaft (11), the hook-shaped pressure plate (13) can rotate around the support shaft (11), and the ball head of the hook-shaped pressure plate (13) can move in the hole of the guide column (9); Step 7, Positioning and clamping of part (14): The part (14) is placed in the positioning seat (4), and the positioning shaft (2) moves downward. The positioning steel ball (5) gradually transitions from the contact with the conical surface of the positioning shaft (2) to the contact with the straight surface of the positioning shaft. At the same time, the positioning steel ball (5) moves radially outward to position the inner hole (1401) in the middle of the part; at the same time, when the positioning shaft (2) moves downward, the ball connecting rod (8) is driven by the connecting plate (6), the guide column (9) is driven by the ball connecting rod (8), and the hook-shaped pressure plate (13) is driven by the guide column (9). The hook-shaped pressure plate (13) rotates around the support shaft (11). After the positioning steel ball (5) cooperates with the straight surface of the positioning shaft to position the part (14), the hook-shaped pressure plate (13) presses the part (14) tightly; Step 8, loosening of part (14): On the contrary, when the positioning shaft (2) moves upward, the hook-shaped pressure plate (13) first releases the part (14), and the positioning steel ball (5) gradually transitions from the straight surface contact with the positioning shaft (2) to the conical surface contact with the positioning shaft. At the same time, the positioning steel ball (5) can move radially inward, and the part can be directly taken out.

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