A high-precision anisotropic vertical bushing quick positioning assembly mechanism and its use method

Abstract

The present invention belongs to the field of machine tool fixtures, specifically a high-precision, quick positioning and assembly mechanism for anisotropic vertical bushings and its use method. The mechanism comprises a positioning pin, a threaded positioning pin, a split screw, a curved pressure block, a guide key, and a positioning screw. The mechanism addresses the coaxiality of coaxial bushings mounted on four-frame workpieces, as well as the coaxiality of threaded bushings coaxially mounted on a bushing sidewall hole. It also addresses the coaxiality of threaded bushings and reference holes in four-frame workpieces, as well as the precise positioning and assembly of anisotropic bushings.

Description

Technical Field

[0001] The invention belongs to the field of machine tool fixtures, and in particular relates to a high-precision anisotropic vertical bushing rapid positioning and assembly mechanism and a use method thereof. Background Art

[0002] Machined parts are commonly used structural components in various industries. In helicopters, the frame rib is a commonly used structural component. In order to ensure assembly requirements and prevent scratches, bushings are usually installed in the holes of the frame to protect the workpiece. The coaxiality requirement of bushing 1 and bushing 2 assembled in the four frames is not greater than 0.05mm. In addition, the coaxiality requirement of the inner hole of the threaded bushing and the reference hole on the main body of the four frames is also within 0.05mm, and the coaxiality requirement between it and the hole on the side wall of bushing 2 is not greater than 0.2mm. In the actual assembly process, the traditional press It is easy to ensure the coaxiality of bushing one and bushing two during the assembly process, but the hole on the side wall of bushing two cannot be positioned with the reference hole, and the four-frame structure and press-fitting make it impossible to effectively observe the positioning during the actual operation, and the internal thread of the threaded bushing cannot be directly positioned by the traditional positioning pin, resulting in the inability to assemble bushing two and the threaded bushing in place, causing serious deviations in the four-frame assembly, complicated assembly process, and difficulty in adjustment in the later stage. Therefore, a high-precision anisotropic vertical bushing rapid positioning assembly mechanism is needed for the rapid positioning and assembly of each bushing. Summary of the Invention

[0003] Technical Solution

[0004] A high-precision axial vertical bushing quick positioning assembly mechanism, including a positioning pin 1, a threaded positioning pin 2, an open screw 3, a curved pressure block 4, a guide key 5, and a positioning screw 6; the positioning pin 1 is provided with a handle on one side and a three-section cylindrical boss on the other side, a chamfer is provided between the large cylindrical boss and the middle cylindrical boss, the chamfer is used for transfer guidance, a tool backing groove is provided between the middle cylinder and the small cylindrical platform to prevent the middle cylindrical boss from interfering with the four frames 7, the end face of the small cylindrical boss is provided with a chamfer for guidance, and a plane cut is provided on the side, the plane cut is provided with a T-slot in the vertical direction, and the plane A threaded through hole is provided on the incision, an avoidance hole is provided on the side of the threaded through hole close to the plane incision, and a positioning hole is provided on the side of the threaded through hole away from the plane incision. The guide key 5 is installed in the T-slot, and the positioning screw 6 passes through the arc surface pressure block 4 and is installed on the positioning hole. The open screw 3 is provided in the threaded through hole, and the threaded section of the positioning screw 6 is screwed with the open screw 3; the guide key 5 is clearance-matched with the guide groove provided on the arc surface pressure block 4, and the arc surface pressure block 4 slides up and down along the vertical direction of the guide key 5. The curvature of the end face of the arc surface pressure block 4 should match the outer circle of the bushing B of the four frames 7;

[0005] One side of the threaded positioning pin 2 is a handle, and the other side is a cylindrical boss. The large cylindrical boss is provided with an external thread, and a chamfer is provided between the small cylindrical boss and the large cylindrical boss for guiding. The end face of the small cylindrical boss is provided with a chamfer guide. The threaded positioning pin 2 is used to position the threaded bushing on the four frame 7 so that the threaded bushing is coaxial with the reference hole on the four frame 7.

[0006] The threaded positioning pin 2 enters the avoidance hole to ensure that the hole on the side wall of the bushing B of the four frame 7 is coaxial with the reference hole on the four frame 7.

[0007] Furthermore, a countersunk hole is provided at the arc surface end of the arc surface pressure block 4, so that the cylindrical head with a groove of the positioning screw 6 is completely sunk into the countersunk hole at one end of the arc surface of the arc surface pressure block 4, so as to prevent the cylindrical head of the slotted end of the positioning screw 6 from interfering with the side wall of the mounting hole of the bushing B on the four frames 7, thereby affecting the assembly;

[0008] Furthermore, the positioning screw 6 is a three-junction cylindrical structure of large, medium and small, wherein the small cylindrical surface is provided with an external thread, the diameter of the middle cylinder is smaller than the through hole in the arc surface pressing block 4, and the height of the middle cylinder is greater than the height of the small hole of the countersunk hole in the arc surface pressing block 4 by 1 mm, to prevent the arc surface pressing block 4 from being locked after assembly, and to facilitate the arc surface pressing block 4 to move up and down along the axial direction;

[0009] Furthermore, the open screw 3 is a fully externally threaded structure, one end of which is provided with an opening to facilitate installation and adjustment of the open screw 3, and the other end is provided with an internally threaded hole for threading with the small cylindrical threaded end of the positioning screw 6;

[0010] Furthermore, during the manufacturing process of the threaded positioning pin 2, the coaxiality of the two cylindrical surfaces at the positioning end of the threaded positioning pin 2 must be tested before the threads are processed. After passing the test, the threads can be further processed to ensure the coaxiality requirements of the bushing B on the four-frame 7 and the reference hole on the four-frame 7.

[0011] Furthermore, an outer circular shoulder is directly provided between the handle side of the threaded positioning pin 2 and the cylindrical boss side, and a back-off groove is provided between the shoulder close to the cylindrical boss and the shoulder, for installing the bushing C of the four-frame 7 and preventing the threaded positioning pin shoulder from interfering with the bushing C of the four-frame 7;

[0012] Furthermore, the depth of the positioning hole on the other side of the small cylindrical convex balcony plane cutout of the positioning pin 1 is greater than the maximum height of the arc surface pressing block 4 by 1mm to 2mm, so that the arc surface pressing block 4 can be completely sunk into the positioning hole on the other side of the small cylindrical convex balcony plane cutout of the positioning pin 1 when moving along its axial direction, thereby preventing interference with the assembly of the bushing B on the four frames 7;

[0013] A method for using a high-precision anisotropic vertical bushing rapid positioning assembly mechanism comprises the following steps:

[0014] Directions:

[0015] 1. Turn the opening screw 3 to drive the arc surface pressure block 4 to move along the axial direction, and make one end of the arc surface completely sink into the positioning hole on the other side of the flat cutout of the small cylindrical boss of the positioning pin 1;

[0016] 2. Further, insert one end of the small cylindrical boss of the positioning pin 1 of the adjusted high-precision vertical bushing rapid positioning assembly mechanism through the inner hole on one side of the boss of bushing A on the fourth frame 7, and align the top surface of the boss of bushing A on the fourth frame 7 with the interface between the large cylindrical boss of the positioning pin 1 and the handle side;

[0017] 3. Further adjust the high-precision anisotropic vertical bushing quick positioning assembly mechanism so that one end of the small cylindrical boss of positioning pin 1 passes through the inner hole on one side of the shoulder of bushing 2 on four-frame 7, and make bushing B on four-frame 7 fit with the mating surface of the middle cylindrical boss and small cylindrical boss on positioning pin 1;

[0018] 4. Further, insert a flat-head screwdriver into the opening on one side of the opening of the open screw 3, and turn the open screw 3 to drive the arc-surface pressure block 4 to move outward toward the side of the small cylindrical boss of the positioning pin 1, and at the same time adjust the bushing 2 on the four-frame 7 so that the hole on the side wall corresponds to the positioning hole on the small cylindrical boss of the positioning pin 1; 5. Further, adjust the open screw 3 so that one end of the arc-surface pressure block 4 protrudes from the side of the small cylindrical boss of the positioning pin 1 and enters the bushing 2 on the four-frame 7 so that it is in the hole on the side wall, and does not protrude from the outer circle of the side wall of the bushing 2 on the four-frame 7, so that the bushing 2 on the four-frame 7 and the positioning pin 1 are completely positioned;

[0019] 6. After installing the bushing, install the bushing installed on one end of the small cylindrical boss of the positioning pin 1 through the bushing installation hole on the fourth frame 7, so that the bushing B and bushing A on the fourth frame 7 are installed in sequence into the corresponding bushing installation holes of the fourth frame 7;

[0020] 7. Further, rotate the positioning pin 1 so that the avoidance hole on the side of the flat cutout of the small cylindrical boss corresponds to the bushing C of the fourth frame 7 and the reference hole on the fourth frame 7;

[0021] 8. Next, pass one end of the small cylinder of the threaded positioning pin 2 through the inner hole of the shoulder of the bushing C on the four-frame 7, and screw the internal thread of the bushing C on the four-frame 7 to the external thread on the large cylindrical surface of the threaded positioning pin 2;

[0022] 9. After the installation is completed, remove the small cylindrical end of the threaded positioning pin 2 from the bushing C on the four frame 7.

[0023] The corresponding bushing mounting holes are installed in the four frames 7;

[0024] 10. Further, the small cylindrical end of the threaded positioning pin 2 is further inserted into the reference hole on the four-frame 7. At the same time, the positioning pin 1 is rotated and adjusted so that the small cylindrical boss of the threaded positioning pin 2 enters the avoidance hole on the side of the flat cutout of the small cylindrical boss of the positioning pin 1.

[0025] 11. Further, the handle end faces of the positioning pin 1 and the threaded positioning pin 2 are knocked in the same manner so that the bushings A, B and C on the four frames 7 are fully installed in place;

[0026] 12. After installation, manually rotate the threaded positioning pin 2 to remove it from the bushing C, the reference hole, and the avoidance hole on the side of the flat cutout of the small cylindrical boss of the positioning pin 1 on the four-frame 7. Then place it in the tooling storage location for the next installation.

[0027] 13. Next, insert a flat-head screwdriver into the opening on one side of the opening of the opening screw 3, and turn the opening screw 3 to drive the arc-surface pressure block 4 to completely sink into the positioning hole on the other side of the flat cutout of the small cylindrical boss of the positioning pin 1;

[0028] 14. Further, manually hold the handle of the positioning pin 1, and completely withdraw the inner holes of the bushings A and B on the four frames 7 along the axis direction of the positioning pin 1, and place the withdrawn positioning pin 1 in the corresponding tooling storage position for the next installation. The bushings A and B on the four frames 7 are now complete.

[0029] And installation of bushing C.

[0030] Technical Effects

[0031] 1. Solve the coaxiality problem of the coaxial bushing installed on the four-frame workpiece and the coaxiality problem of the threaded bushing installed coaxially in the hole on the side wall of a bushing;

[0032] 2. Solve the problem of coaxiality between the threaded bushing and the four-frame workpiece reference hole and the problem of precise positioning and assembly of the anisotropic bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a high-precision anisotropic vertical bushing rapid positioning and assembly mechanism;

[0034] Figure 2 Schematic diagram of the cross section of the four frames 7 along the axis;

[0035] Figure 3 A high-precision anisotropic vertical bushing quick positioning assembly mechanism is shown in an axonometric exploded view.

[0036] Figure 4 A partially exploded schematic diagram of a high-precision, anisotropic vertical bushing rapid positioning and assembly mechanism;

[0037] Figure 5 A partial top view of the end face of a high-precision anisotropic vertical bushing rapid positioning assembly mechanism;

[0038] Figure 6 A partial bottom view of the end face of a high-precision, anisotropic vertical bushing rapid positioning and assembly mechanism. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the following embodiments. The following are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] A method for quickly locating and assembling a high-precision anisotropic vertical bushing includes the following steps:

[0041] Assembly method:

[0042] 1. Press the guide key 5 tightly into the T-slot on the small cylindrical boss of the positioning pin 1 from the other side of the flat cutout of the small cylindrical boss of the positioning pin 1. Make sure the guide key 5 is completely sunk into the T-slot on the small cylindrical boss of the positioning pin 1, and the distance between its end face and the cylindrical surface on the other side of the flat cutout of the cylindrical boss of the positioning pin 1 is about 1 to 3 mm.

[0043] 2. Further, install one end of the curved surface pressing block 4 into the positioning hole on the other side corresponding to the flat cutout of the small cylindrical boss of the positioning pin 1, and match the guide groove on the side wall of the curved surface pressing block 4 with the guide key on the small end of the guide key 5, so that the curved surface pressing block 4 slides smoothly along the direction of the guide key 5;

[0044] 3. Further, open the other end of the open screw 3 and pass it through the avoidance hole on one side of the flat cutout of the small cylindrical boss of the positioning pin 1, and screw it into the threaded hole on the small cylindrical boss of the positioning pin 1. The open screw 3 should be opened so that one end does not protrude from the bottom plane of the positioning hole on the other side of the flat cutout of the small cylindrical boss of the positioning pin 1;

[0045] 4. Further, one end of the thread of the positioning screw 6 is passed through the countersunk through hole at one end of the arc surface of the arc surface pressure block 4 through the inner hole of the arc surface pressure block 4, and the large circle end of the positioning screw 6 is sunk into the countersunk hole at one end of the arc surface of the arc surface pressure block 4; 5. Further, one end of the thread of the positioning screw 6 is screwed into the internal threaded hole at the other end of the opening of the open screw 3, and the butt joint surface between the cylinder in the positioning screw 6 and the small cylindrical surface of the external thread is aligned with the bottom plane of the other end of the opening of the open screw 3;

[0046] 6. Furthermore, insert a flat-head screwdriver into the opening on one side of the opening of the open screw 3 and turn the open screw 3 to further verify whether the arc surface pressure block 4 moves smoothly. After verifying that the arc surface pressure block 4 moves smoothly up and down along the axis of the arc surface pressure block 4, the assembly of all parts can be completed.

[0047] Figure 1 The figure shows a schematic diagram of a high-precision, vertically oriented bushing rapid positioning assembly mechanism, including a positioning pin 1, a threaded positioning pin 2, a cotter screw 3, a curved pressure block 4, a guide key 5, a positioning screw 6, and a four-frame 7. The structure shown is a cross-sectional diagram of bushings A, B, and C installed on the four-frame 7, as well as the positions of the various components of the high-precision, vertically oriented bushing rapid positioning assembly mechanism. Figure 2 The figure shows a cross-sectional view of the four-frame 7 along the axis, including the main body of the four-frame 7 and the bushings A, B and C assembled on the four-frame 7, and through Figure 2 Indicates the specific positions of bushing A, bushing B and bushing C on the four frames 7, their mutual assembly relationship and the assembly requirements between the bushings;

[0048] Figure 3 The figure shows an axonometric exploded view of the structure of a high-precision anisotropic vertical bushing rapid positioning assembly mechanism. The figure includes all the components that make up a high-precision anisotropic vertical bushing rapid positioning assembly mechanism: positioning pin 1, threaded positioning pin 2, open screw 3, arc surface pressure block 4, guide key 5, positioning screw 6. Figure 3 shows the assembly direction and mutual assembly relationship between the various components of a high-precision anisotropic vertical bushing rapid positioning assembly mechanism, and through Figure 3 The diagram shows the structure of the various components of a high-precision, anisotropic vertical bushing rapid positioning assembly mechanism, as well as the following: the positioning pin 1, threaded positioning pin 2, open screw 3, arc-surface pressure block 4, guide key 5, and positioning screw 6 during installation;

[0049] Figure 4 The diagram shows a partially exploded view of a high-precision, vertically oriented bushing rapid positioning assembly mechanism. The diagram includes all components that make up the mechanism: positioning pin 1, threaded positioning pin 2, open screw 3, arc-surface pressure block 4, guide key 5, and positioning screw 6. The diagram further illustrates the installation and structural form of each component of the high-precision, vertically oriented bushing rapid positioning assembly mechanism by enlarging the schematic diagram.

[0050] Figure 5 The figure shows a partial top view of the end face of a high-precision anisotropic vertical bushing quick positioning assembly mechanism, including a positioning pin 1, an open screw 3, and a guide key 5. The figure shows a partial schematic diagram of the installation after the positioning pin 1 is installed from the direction of the flat cut of the small cylindrical end. Figure 5The installation form of the open screw 3 and the guide key 5 in the T-slot and the through hole in the small cylindrical end of the positioning pin 1 is further clearly expressed;

[0051] Figure 6 This is a partial bottom view of the end face of a high-precision anisotropic vertical bushing rapid positioning assembly mechanism, including a positioning pin 1, a curved pressure block 4, a guide key 5, and a positioning screw 6. Figure 6 The diagram shows a partial diagram after the installation is completed, looking up from the other side of the small cylindrical end plane cutout. Figure 6 The installation form of the arc surface pressure block 4, the guide key 5, and the positioning screw 6 in the T-slot and the through hole in the small cylindrical end of the positioning pin 1 is further clearly expressed.

[0052] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with that in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein. The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism, characterized in that: It includes a positioning pin, a threaded positioning pin, an open screw, a cambered pressure block, a guide key, and a positioning screw; the positioning pin is provided with a handle on one side and three cylindrical bosses on the other side, a chamfer is provided between the large cylindrical boss and the middle cylindrical boss, the chamfer is used for transfer guidance, a back-off groove is provided between the middle cylinder and the small cylindrical platform to prevent the middle cylindrical boss from interfering with the four frames, the end face of the small cylindrical boss is provided with a chamfer for guidance, a plane cut is provided on the side, a T-slot is provided in the vertical direction of the plane cut, and a thread is provided on the plane cut A through hole is provided, wherein the threaded through hole is provided with an avoidance hole on the side close to the plane incision, and a positioning hole is provided on the side of the threaded through hole away from the plane incision. The guide key is installed in the T-slot, and the positioning screw passes through the arc surface pressure block and is installed on the positioning hole. The open screw is provided in the threaded through hole, and the threaded section of the positioning screw is screwed with the open screw. The guide key is loosely matched with the guide groove provided on the arc surface pressure block, and the arc surface pressure block slides up and down along the vertical direction of the guide key. The curvature of the end face of the arc surface pressure block should match the outer circle of the four-frame bushing B. One side of the threaded positioning pin is a handle, and the other side is a cylindrical boss. The large cylindrical boss is provided with an external thread, and a chamfer is provided between the small cylindrical boss and the large cylindrical boss for guidance. The end face of the small cylindrical boss is provided with a chamfer guide. The threaded positioning pin is used to position the threaded bushing on the four frames so that the threaded bushing is coaxial with the reference hole on the four frames; The threaded positioning pin enters the avoidance hole to ensure that the hole on the side wall of the four-frame bushing B is coaxial with the reference hole on the four-frame.

2. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 1, characterized in that: A countersunk hole is provided at the arc surface end of the arc surface pressing block, so that the cylindrical head with a groove of the positioning screw is completely sunk into the countersunk hole at one end of the arc surface of the arc surface pressing block.

3. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 2, characterized in that: The positioning screw is a three-node cylindrical structure of large, medium and small. The small cylindrical surface is provided with an external thread, the diameter of the middle cylinder is smaller than the through hole in the arc surface pressure block, and the height of the middle cylinder is 1mm greater than the height of the countersunk hole in the arc surface pressure block, to prevent the arc surface pressure block from locking after assembly and facilitate the arc surface pressure block to move up and down along the axial direction.

4. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 3, characterized in that: The open screw has a full external thread structure, with an opening at one end to facilitate the installation and adjustment of the open screw, and an internal threaded hole at the other end for threading with the small cylindrical threaded end of the positioning screw.

5. A high-precision, anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 4, characterized in that: During the manufacturing process of threaded locating pins, the coaxiality of the two cylindrical surfaces at one end of the threaded locating pin must be tested before processing the threads. After passing the test, the threads can be further processed to ensure the coaxiality requirements of the bushing B on the four-frame and the reference hole on the four-frame.

6. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 5, characterized in that: An external circular shoulder is directly provided on one side of the threaded positioning pin handle and one side of the cylindrical boss, and a back-off groove is provided between the shoulder and the side close to the cylindrical boss, which is used for installing the four-frame bushing C and preventing the threaded positioning pin shoulder from interfering with the four-frame bushing C.

7. A high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 6, characterized in that: The depth of the positioning hole on the other side of the small cylindrical convex balcony plane cutout of the positioning pin is 1mm to 2mm greater than the maximum height of the arc surface pressure block, so that the arc surface pressure block can be completely sunk into the positioning hole on the other side of the small cylindrical convex balcony plane cutout of the positioning pin when moving along its axial direction, thereby preventing interference in the assembly of the bushing B on the four frames.

8. The method for using a high-precision anisotropic vertical bushing rapid positioning and assembly mechanism according to claim 1, characterized in that: The steps include: 1) Turn the opening screw to drive the arc surface pressure block to move along the axial direction, and make one end of the arc surface completely sink into the positioning hole on the other side of the flat cutout of the small cylindrical boss of the positioning pin; 2) Pass one end of the small cylindrical boss of the positioning pin of the high-precision anisotropic vertical bushing quick positioning assembly mechanism through the inner hole on one side of the bushing A shoulder on the four frames, and align the top surface of the bushing A shoulder on the four frames with the joint surface of the large cylindrical boss of the positioning pin and the handle side; 3) Adjust the high-precision anisotropic vertical bushing quick positioning assembly mechanism into place, and pass one end of the small cylindrical boss of the positioning pin through the inner hole on one side of the bushing shoulder on the four frames, and make the bushing B on the four frames fit with the mating surface of the middle cylindrical boss and the small cylindrical boss on the positioning pin; 4) Insert a flat-head screwdriver into the opening on one side of the split screw and turn the split screw to move the arc-surface pressure block toward the outside of the small cylindrical boss of the positioning pin. At the same time, adjust the bushings on the four frames so that the holes on the side walls correspond to the positioning holes on the small cylindrical boss of the positioning pin. 5) Adjust the opening screw so that one end of the arc surface of the arc surface pressure block protrudes from the side of the small cylindrical boss of the positioning pin and enters the hole on the side wall of the bushing on the four frames, without protruding from the outer circle of the side wall of the bushing on the four frames, so that the bushing on the four frames and the positioning pin are completely positioned; 6) After installing the No. bushing, install the bushing installed on one end of the small cylindrical boss of the positioning pin into the bushing installation hole on the four frames, so that the bushing B and bushing A on the four frames are installed in the corresponding bushing installation holes of the four frames in sequence; 7) Turn the positioning pin so that the avoidance hole on the side of the flat cutout of the small cylindrical boss corresponds to the reference hole on the four-frame bushing C and the four-frame; 8) Pass one end of the small cylindrical threaded positioning pin through the inner hole on the shoulder of the bushing C on the four frames, and screw the internal thread of the bushing C on the four frames to the external thread on the large cylindrical surface of the threaded positioning pin; 9) After installation is complete, install one end of the small cylindrical threaded positioning pin into the four frames through the bushing mounting hole corresponding to bushing C on the four frames; 10) Continue to insert one end of the small cylindrical threaded positioning pin into the reference hole on the four frames, and at the same time rotate and adjust the positioning pin so that the small cylindrical boss of the threaded positioning pin enters the avoidance hole on one side of the flat cut of the small cylindrical boss of the positioning pin; 11) Isomorphically strike the positioning pin and the end face of the threaded positioning pin handle to fully install the bushings A, B and C on the four frames; 12) After installation, manually rotate the threaded positioning pin to make it exit from the bushing C, reference hole and avoidance hole on the side of the flat cut of the small cylindrical boss of the positioning pin on the four frames, and then place it in the tooling storage position. For next installation use; 13) Insert a flat-head screwdriver into the opening on one side of the opening of the opening screw, and turn the opening screw to drive the arc surface pressure block to completely sink into the positioning pin so that the positioning pin is positioned in the positioning hole on the other side of the flat cutout of the small cylindrical boss; 14) Manually hold the handle of the positioning pin and completely withdraw the inner holes of the bushings A and B on the four frames along the axis of the positioning pin, and place the withdrawn positioning pins in the corresponding tooling storage position for the next installation. This completes the installation of bushings A, B, and C on the four frames.

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