Self-adaptive positioning clamp for high-precision boring of center hole of propeller

Abstract

The invention relates to the technical field of propeller machining clamps, discloses a high-precision boring self-adaptive positioning clamp for a propeller center hole, and solves the problems that in the using process of a positioning clamp for high-precision boring machining of the propeller center hole, the propeller cannot be quickly positioned and clamped, and the machining efficiency is high. The positioning and clamping device comprises a mounting bottom plate, fixing mounting holes are formed in the four corners of the mounting bottom plate in a penetrating mode, a control switch is fixedly mounted at the top of one end of the mounting bottom plate, an adjusting and moving assembly is mounted in the middle of the top end of the mounting bottom plate, and a positioning and clamping assembly is mounted at the top of the adjusting and moving assembly; the positioning and clamping assembly comprises a circular frame; according to the positioning clamp for high-precision boring machining of the center hole of the propeller, in the using process, the positioning clamp for high-precision boring machining of the center hole of the propeller can rapidly conduct positioning and clamping operation on the propeller, the position can be adjusted after positioning and clamping, it is ensured that machining operation can be better conducted, and therefore the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of propeller processing clamps, in particular to a high-precision boring self-adaptive positioning clamp for propeller holes. BACKGROUND

[0002] A propeller is a device that converts rotary motion from a propeller shaft into thrust to propel a vehicle in the air or water, and can have two or more blades connected to the hub, and the rear surface of the blade is a spiral surface or a kind of propeller approximating to a spiral surface, propellers are divided into many types and are widely used, such as propellers of aircraft and ships, etc., in the process of propeller processing, a positioning clamp is used to position and clamp the propeller, and then a high-precision boring method is used to process the hole of the propeller, but the positioning clamp for high-precision boring of propeller holes cannot quickly position and clamp the propeller during use, and cannot adjust the position after positioning and clamping, which leads to poor processing operation and reduces the work efficiency. SUMMARY

[0003] In view of the above problems, the application provides a high-precision boring self-adaptive positioning clamp for propeller holes, which effectively solves the problem that the positioning clamp for high-precision boring of propeller holes cannot quickly position and clamp the propeller during use, and cannot adjust the position after positioning and clamping, which leads to poor processing operation and reduces the work efficiency.

[0004] To achieve the above purpose, the application provides the following technical scheme: a high-precision boring self-adaptive positioning clamp for propeller holes, comprising a mounting bottom plate, four corners of the mounting bottom plate are provided with fixed mounting holes, one end of the mounting bottom plate is provided with a control switch, a top end of the mounting bottom plate is provided with an adjusting and moving assembly, a top of the adjusting and moving assembly is provided with a positioning and clamping assembly, the positioning and clamping assembly comprises a circular frame, the circular frame is fixedly installed on the top of the adjusting and moving assembly, a top of the circular frame is provided with a circular table plate, four positioning and clamping seats are symmetrically arranged on the top of the circular table plate, and each of the four positioning and clamping seats is provided with a toothed rubber plate close to the center of the circular table plate.

[0005] Preferably, the bottom end of the circular platform is fixedly provided with an adjusting motor A, the bottom of the output shaft of the adjusting motor A is rotatably connected to the inner bottom end of the circular frame, the outer side of the output shaft of the adjusting motor A is fixedly provided with a retractable reel, the outer side of the retractable reel is fixedly provided with four steel wire pull ropes, the ends of the steel wire pull ropes away from the retractable reel are fixedly provided with movable seats, the top of each movable seat is fixedly provided with a movable sleeve, a positioning cross bar is slidably arranged in the movable sleeve, the two ends of the positioning cross bar are fixedly provided with connecting blocks, the top of each connecting block is fixedly connected to the bottom of the circular platform, the top of the movable sleeve is fixedly provided with a sliding block, four sliding grooves are symmetrically formed in the inner part of the circular platform, and the four sliding blocks are slidably arranged in the four sliding grooves, respectively.

[0006] Preferably, the inner wall of the movable sleeve is symmetrically fixedly provided with a positioning sliding strip, and the outer side of the positioning cross bar is symmetrically provided with a positioning sliding groove, and the positioning sliding strip is slidably arranged in the positioning sliding groove.

[0007] Preferably, the side of the movable sleeve close to the retractable reel is fixedly provided with a movable ring, the side of the movable ring away from the movable sleeve is fixedly provided with a compression spring, the end of the compression spring away from the movable ring is fixedly provided with a positioning ring, the positioning ring is fixedly arranged on the outer side of the positioning cross bar, and the compression spring and the movable ring are movably arranged on the outer side of the positioning cross bar.

[0008] Preferably, the adjusting moving assembly comprises a strip-shaped frame A, the strip-shaped frame A is fixedly arranged on the top middle part of the mounting bottom plate, one end of the strip-shaped frame A is fixedly provided with an adjusting motor B, an adjusting screw is rotatably arranged in the strip-shaped frame A, the output shaft of the adjusting motor B is movably arranged in one end of the strip-shaped frame A and fixedly connected to one end of the adjusting screw, a threaded sleeve is threadedly arranged in the inner part of the strip-shaped frame A and located on the outer side of the adjusting screw, a strip-shaped frame B is arranged above the strip-shaped frame A, the strip-shaped frame B and the strip-shaped frame A are arranged in a cross shape, and the threaded sleeve is fixedly arranged on the bottom middle part of the strip-shaped frame B.

[0009] Preferably, the two sides of the strip-shaped frame A are provided with positioning sliding rods A, the two ends of each positioning sliding rod A are fixedly provided with positioning blocks A, the positioning blocks A are fixedly arranged on the outer side of the strip-shaped frame A, positioning sliding sleeves A are slidably arranged on the outer side of the positioning sliding rods A, and the two positioning sliding sleeves A are symmetrically fixedly arranged on the bottom of the strip-shaped frame B.

[0010] Preferably, the inner middle part of the strip-shaped frame B is fixedly provided with a double-shaft motor, two ends of the double-shaft motor are fixedly provided with adjusting shaft rods, one end of the adjusting shaft rod away from the double-shaft motor is rotatably provided with a positioning shaft seat, the positioning shaft seat is fixedly provided on the inner wall of the strip-shaped frame B, the outer side of the adjusting shaft rod is fixedly provided with a transmission gear, the top of the transmission gear is meshedly connected with a transmission rack, the top of the transmission rack is fixedly provided with a connecting strip, and the top of the connecting strip is fixedly connected with the bottom of the circular frame.

[0011] Preferably, the two top ends of the strip-shaped frame B are symmetrically provided with openings, the size of the opening is matched with the cross-sectional size of the transmission rack, and the two ends of the transmission rack are movably provided in the opening.

[0012] Preferably, the outer side of the strip-shaped frame B is symmetrically provided with a positioning sliding rod B, the two ends of the positioning sliding rod B are fixedly provided with positioning blocks B, the positioning blocks B are fixedly provided on the outer side of the strip-shaped frame B, the outer side of the positioning sliding rod B is symmetrically fixedly provided with positioning sliding sleeves B, and the two positioning sliding sleeves B are symmetrically fixedly provided on the bottom of the circular frame.

[0013] Compared with the prior art, the beneficial effects of the present application are:

[0014] 1) In work, through the mutual action of the installed base plate, the fixed mounting hole, the adjusting and moving assembly and the positioning and clamping assembly, the positioning clamp for high-precision boring of the propeller hole can quickly position and clamp the propeller during use, and the position can be adjusted after positioning and clamping, so that better machining operation is facilitated, thereby improving the work efficiency.

[0015] 2) In work, through the mutual action of the positioning sliding bar and the positioning sliding groove, the movable sleeve can achieve better stability during movement, thereby ensuring that the positioning and clamping assembly can work stably.

[0016] 3) In work, through the mutual action of the positioning block A, the positioning sliding rod A and the positioning sliding sleeve A, the strip-shaped frame B can achieve better stability during movement, thereby ensuring that the adjusting and moving assembly can work stably.

[0017] 4) In work, through the mutual action of the positioning block B, the positioning sliding rod B and the positioning sliding sleeve B, the circular frame can achieve better stability during movement, thereby ensuring that the positioning and clamping assembly can move and adjust stably. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, but do not constitute a limitation of the present application.

[0019] In the drawings:

[0020] Figure 1 It is the structural schematic drawing of adaptive positioning fixture for high-precision boring of propeller middle hole of the application;

[0021] Figure 2 It is the structural schematic drawing of positioning and clamping assembly of the application;

[0022] Figure 3 It is the internal structure schematic drawing of circular frame of the application;

[0023] Figure 4 It is the split structure schematic drawing of movable sleeve and positioning crossbar of the application;

[0024] Figure 5 It is the structural schematic drawing of adjusting and moving assembly of the application;

[0025] Figure 6 It is the internal structure schematic drawing of strip-shaped frame B of the application.

[0026] In the drawings: 1, mounting bottom plate; 2, fixed mounting hole; 3, control switch; 4, adjusting and moving assembly; 5, positioning and clamping assembly; 6, circular frame; 7, circular table plate; 8, positioning and clamping seat; 9, toothed rubber plate; 10, adjusting motor A; 11, winding and unwinding wheel; 12, steel wire pull rope; 13, movable seat; 14, movable sleeve; 15, positioning crossbar; 16, connecting block; 17, sliding block; 18, sliding groove; 19, positioning sliding bar; 20, positioning sliding groove; 21, movable ring; 22, compression spring; 23, positioning ring; 24, strip-shaped frame A; 25, adjusting motor B; 26, adjusting screw; 27, threaded sleeve; 28, strip-shaped frame B; 29, positioning sliding rod A; 30, positioning block A; 31, positioning sliding sleeve A; 32, double-shaft motor; 33, adjusting shaft; 34, positioning shaft seat; 35, transmission gear; 36, transmission rack; 37, connecting strip; 38, opening; 39, positioning sliding rod B; 40, positioning block B; 41, positioning sliding sleeve B. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0028] Embodiment one, by Figure 1 , Figure 2 , Figure 3 , Figure 4 ,Figure 5 And Figure 6 Given, the application includes installation of the base plate 1, the four corners of the installation of the base plate 1 are provided with fixed mounting hole 2, one end of the installation of the base plate 1 is provided with control switch 3, the top of the installation of the base plate 1 is provided with adjusting movement assembly 4, in use, through the interaction of the installation of the base plate 1, the fixed mounting hole 2, the adjusting movement assembly 4 and the positioning and clamping assembly 5, the positioning fixture for high-precision boring of propeller hole can quickly position and clamp the propeller during use, and the position can be adjusted after positioning and clamping, ensuring better processing operation, thereby improving the work efficiency;

[0029] The top of the adjusting movement assembly 4 is provided with the positioning and clamping assembly 5, the positioning and clamping assembly 5 includes a circular frame 6, and the circular frame 6 is fixedly installed on the top of the adjusting movement assembly 4, the top of the circular frame 6 is fixedly provided with a circular table plate 7, the top of the circular table plate 7 is symmetrically provided with four positioning and clamping seats 8, and the side close to the center of the circular table plate 7 is fixedly provided with a toothed rubber plate 9, the bottom end of the circular table plate 7 is fixedly provided with an adjusting motor A 10, the output shaft of the adjusting motor A 10 is rotatably connected to the inner bottom of the circular frame 6, the outer side of the output shaft of the adjusting motor A 10 is fixedly provided with a retractable wheel 11, and the outer side of the retractable wheel 11 is fixedly provided with four steel wire pull ropes 12, and the end away from the retractable wheel 11 of the steel wire pull rope 12 is fixedly provided with a movable seat 13.

[0030] The top of the movable seat 13 is fixedly provided with a movable sleeve 14, the inside of the movable sleeve 14 is slidably provided with a positioning cross bar 15, the two ends of the positioning cross bar 15 are fixedly provided with a connecting block 16, and the top of the connecting block 16 is fixedly connected to the bottom of the circular table plate 7, the inner wall of the movable sleeve 14 is symmetrically fixedly provided with a positioning sliding strip 19, the outer side of the positioning cross bar 15 is symmetrically provided with a positioning sliding groove 20, and the positioning sliding strip 19 is slidably installed in the positioning sliding groove 20, which can ensure that the movable sleeve 14 is moved to achieve better stability, the side close to the retractable wheel 11 of the movable sleeve 14 is fixedly provided with a movable ring 21, the side away from the movable sleeve 14 of the movable ring 21 is fixedly provided with a compression spring 22, the end away from the movable ring 21 of the compression spring 22 is fixedly provided with a positioning ring 23, and the positioning ring 23 is fixedly installed on the outer side of the positioning cross bar 15, the compression spring 22 and the movable ring 21 are movably installed on the outer side of the positioning cross bar 15, the top of the movable sleeve 14 is fixedly provided with a sliding block 17, the inside of the circular table plate 7 is symmetrically provided with four sliding grooves 18, and the four sliding blocks 17 are respectively slidably installed in the four sliding grooves 18, and the top of the four positioning and clamping seats 8 is respectively fixedly provided with the four sliding blocks 17.

[0031] The adjusting moving assembly 4 comprises a strip-shaped frame A 24, and the strip-shaped frame A 24 is fixedly installed at the middle of the top end of the mounting bottom plate 1. One end of the strip-shaped frame A 24 is fixedly installed with an adjusting motor B 25. An adjusting screw rod 26 is rotatably installed in the strip-shaped frame A 24. The output shaft of the adjusting motor B 25 is movably penetrated through one end of the strip-shaped frame A 24 and is fixedly connected with one end of the adjusting screw rod 26. A threaded sleeve 27 is screwedly installed in the inside of the strip-shaped frame A 24 and at the outside of the adjusting screw rod 26. A strip-shaped frame B 28 is arranged above the strip-shaped frame A 24, and the strip-shaped frame B 28 is arranged in a cross shape with the strip-shaped frame A 24. The threaded sleeve 27 is fixedly installed at the bottom middle of the strip-shaped frame B 28. Positioning sliding rods A 29 are arranged at the two sides of the strip-shaped frame A 24. Positioning blocks A 30 are fixedly installed at the two ends of the positioning sliding rods A 29 and at the outside of the strip-shaped frame A 24. Positioning sliding sleeves A 31 are slidably installed at the outside of the positioning sliding rods A 29, and the two positioning sliding sleeves A 31 are symmetrically fixedly installed at the bottom of the strip-shaped frame B 28, so that the strip-shaped frame B 28 can be conveniently stabilized during movement.

[0032] A double-shaft motor 32 is fixedly installed at the inside middle of the strip-shaped frame B 28. Adjusting shaft rods 33 are fixedly installed at the two end output shafts of the double-shaft motor 32. Positioning shaft seats 34 are rotatably installed at the ends of the adjusting shaft rods 33 away from the double-shaft motor 32 and are fixedly installed on the inner wall of the strip-shaped frame B 28. Transmission gears 35 are fixedly installed at the outside of the adjusting shaft rods 33. Transmission racks 36 are meshingly connected with the top portions of the transmission gears 35. Openings 38 are symmetrically arranged at the two top ends of the strip-shaped frame B 28 and are adapted in size to the cross-sectional size of the transmission racks 36. The two ends of the transmission racks 36 are movably installed in the openings 38. Connecting strips 37 are fixedly installed at the top portions of the transmission racks 36 and are fixedly connected with the bottom of the circular frame 6. Positioning sliding rods B 39 are symmetrically arranged at the outside of the strip-shaped frame B 28. Positioning blocks B 40 are fixedly installed at the two ends of the positioning sliding rods B 39 and at the outside of the strip-shaped frame B 28. Positioning sliding sleeves B 41 are symmetrically fixedly installed at the outside of the positioning sliding rods B 39 and at the bottom of the circular frame 6, so that the circular frame 6 can be better stabilized during movement, thereby ensuring that the positioning and clamping assembly 5 can be stably moved and adjusted.

[0033] Working principle: when working, first, the fixed bolt matched with the diameter of the fixed installation hole 2 is used to fix and install the installation base plate 1, so as to realize the fixed installation of the whole positioning clamp, then the propeller to be positioned and clamped is placed on the top of the circular table plate 7, then the adjusting motor A10 is started to work, the adjusting motor A10 drives the winding and unwinding wheel 11 to rotate, the winding and unwinding wheel 11 rotates to simultaneously wind the four steel wire ropes 12, the four steel wire ropes 12 drive the four movable seats 13 to move respectively, the movable seat 13 drives the movable sleeve 14 to move outside the positioning cross rod 15, the movable sleeve 14 drives the positioning sliding bar 19 to slide inside the positioning sliding groove 20, which can ensure that the movable sleeve 14 moves more stably, at the same time, the movable sleeve 14 drives the movable ring 21 to move, the movable ring 21 moves to extrude the compression spring 22, so that the compression spring 22 elastically deforms, at the same time, the movable sleeve 14 drives the sliding block 17 to slide inside the sliding groove 18, the sliding block 17 drives the positioning and clamping seat 8 to move, at this time, the four positioning and clamping seats 8 move towards the center of the circular table plate 7, the four movable positioning and clamping seats 8 position and clamp the propeller placed on the top of the circular table plate 7, after the positioning and clamping of the propeller is completed, the adjusting motor A10 is stopped;

[0034] Then the double-shaft motor 32 is started to work, the double-shaft motor 32 drives the two adjusting shaft rods 33 to rotate simultaneously, the adjusting shaft rod 33 drives the transmission gear 35 to rotate, the transmission gear 35 drives the transmission rack 36 to move, the transmission rack 36 drives the connecting strip 37 to move, the connecting strip 37 drives the circular frame 6 to move horizontally, the circular frame 6 drives the positioning sliding sleeve B41 to slide outside the positioning sliding rod B39, which can ensure that the circular frame 6 moves more stably, at the same time, the circular frame 6 drives the circular table plate 7 to move, the circular table plate 7 drives the propeller positioned and clamped on the top to move, after the propeller moves to the required position in the horizontal position, the double-shaft motor 32 is stopped;

[0035] Then the adjusting motor B25 is started to work, the adjusting motor B25 drives the adjusting screw rod 26 to rotate, the adjusting screw rod 26 drives the threaded sleeve 27 to move longitudinally, the threaded sleeve 27 drives the strip-shaped frame B28 to move longitudinally, the circular frame 6 on the top of the strip-shaped frame B28 also moves, the propeller positioned and clamped on the top of the circular table plate 7 also moves, after the propeller moves to the required position in the longitudinal position, the adjusting motor B25 is stopped, then the center hole of the propeller can be bored, so that the positioning clamp for high-precision boring of the propeller center hole can quickly position and clamp the propeller during use, and the position can be adjusted after positioning and clamping, which ensures that the machining operation is more convenient, thereby improving the working efficiency.

Claims

1. A high-precision adaptive positioning fixture for boring a hole in a propeller, comprising a mounting base plate (1), characterized in that: The mounting base plate (1) has fixed mounting holes (2) through all four corners. A control switch (3) is fixedly installed on the top of one end of the mounting base plate (1). An adjustment and moving assembly (4) is installed in the middle of the top of the mounting base plate (1). A positioning clamping assembly (5) is installed on the top of the adjustment and moving assembly (4). The positioning clamping assembly (5) includes a circular frame (6), and the circular frame (6) is fixedly installed on the top of the adjustment and moving assembly (4). A circular platform (7) is fixedly installed on the top of the circular frame (6). Four positioning clamping seats (8) are symmetrically arranged on the top of the circular platform (7). A toothed rubber plate (9) is fixedly installed on the side of the four positioning clamping seats (8) near the center of the circular platform (7).

2. The high-precision boring adaptive positioning fixture for a propeller bore according to claim 1, characterized in that: An adjusting motor A (10) is fixedly installed at the bottom center of the circular platform (7). The bottom of the output shaft of the adjusting motor A (10) is rotatably connected to the inner bottom center of the circular frame (6). A take-up and release wheel (11) is fixedly installed on the outside of the output shaft of the adjusting motor A (10). Four steel wire ropes (12) are fixedly installed on the outside of each take-up and release wheel (11). A movable seat (13) is fixedly installed at the end of the steel wire rope (12) away from the take-up and release wheel (11). A movable sleeve (14) is fixedly installed on the top of the movable seat (13). A positioning crossbar (15) is installed through the interior. Connecting blocks (16) are fixedly installed at both ends of the positioning crossbar (15). The top of the connecting blocks (16) is fixedly connected to the bottom of the circular platform (7). A sliding block (17) is fixedly installed on the top of the movable sleeve (14). Four sliding grooves (18) are symmetrically opened through the interior of the circular platform (7). The four sliding blocks (17) are slidably installed through the interior of the four sliding grooves (18). The tops of the four sliding blocks (17) are fixedly installed on the four positioning clamps (8).

3. The high-precision boring adaptive positioning fixture for a propeller bore according to claim 2, characterized in that: The inner wall of the movable sleeve (14) is symmetrically fixed with positioning slides (19), and the outer side of the positioning crossbar (15) is symmetrically provided with positioning grooves (20), and the positioning slides (19) are slidably installed inside the positioning grooves (20).

4. The high-precision boring adaptive positioning fixture for a propeller bore according to claim 2, characterized in that: A movable ring (21) is fixedly installed on the side of the movable sleeve (14) near the take-up and release wheel (11). A compression spring (22) is fixedly installed on the side of the movable ring (21) away from the movable sleeve (14). A positioning ring (23) is fixedly installed on the end of the compression spring (22) away from the movable ring (21). The positioning ring (23) is fixedly installed on the outside of the positioning crossbar (15). Both the compression spring (22) and the movable ring (21) are movably installed on the outside of the positioning crossbar (15).

5. The high-precision boring adaptive positioning fixture for a propeller bore according to claim 1, characterized in that: The adjustment and movement assembly (4) includes a strip frame A (24), which is fixedly installed at the top center of the mounting base plate (1). An adjustment motor B (25) is fixedly installed at one end of the strip frame A (24). An adjustment screw (26) is rotatably installed inside the strip frame A (24). The output shaft of the adjustment motor B (25) passes through one end of the strip frame A (24) and is fixedly connected to one end of the adjustment screw (26). A threaded sleeve (27) is threadedly installed inside the strip frame A (24) and outside the adjustment screw (26). A strip frame B (28) is provided above the strip frame A (24), and the strip frame B (28) and the strip frame A (24) are arranged in a cross shape. The threaded sleeve (27) is fixedly installed at the bottom center of the strip frame B (28).

6. The high-precision boring adaptive positioning fixture for a propeller bore according to claim 5, characterized in that: Both sides of the strip frame A (24) are provided with positioning slide rods A (29), and both ends of the positioning slide rods A (29) are fixedly installed with positioning blocks A (30). The positioning blocks A (30) are fixedly installed on the outside of the strip frame A (24). The positioning slide sleeves A (31) are slidably installed on the outside of the positioning slide rods A (29), and the two positioning slide sleeves A (31) are symmetrically fixedly installed at the bottom of the strip frame B (28).

7. A high-precision boring adaptive positioning fixture for a propeller bore according to claim 5, characterized in that: A dual-axis motor (32) is fixedly installed in the middle of the inner part of the strip frame B (28). An adjusting shaft (33) is fixedly installed on both ends of the output shaft of the dual-axis motor (32). A positioning shaft seat (34) is rotatably installed on the end of the adjusting shaft (33) away from the dual-axis motor (32). The positioning shaft seat (34) is fixedly installed on the inner wall of the strip frame B (28). A transmission gear (35) is fixedly installed on the outer side of the adjusting shaft (33). A transmission rack (36) is meshed with the top of the transmission gear (35). A connecting strip (37) is fixedly installed on the top of the transmission rack (36). The top of the connecting strip (37) is fixedly connected to the bottom of the circular frame (6).

8. A high-precision boring adaptive positioning fixture for a propeller bore according to claim 7, characterized in that: The top two sides of the strip frame B (28) are symmetrically provided with openings (38), and the size of the openings (38) is adapted to the cross-sectional size of the transmission rack (36). Both ends of the transmission rack (36) are movably installed inside the openings (38).

9. A high-precision boring adaptive positioning fixture for a propeller bore according to claim 5, characterized in that: The outer side of the strip frame B (28) is symmetrically provided with positioning slide rods B (39), and positioning blocks B (40) are fixedly installed at both ends of the positioning slide rods B (39). The positioning blocks B (40) are fixedly installed on the outer side of the strip frame B (28). Positioning sleeves B (41) are symmetrically fixedly installed on the outer side of the positioning slide rods B (39), and the two positioning sleeves B (41) are symmetrically fixedly installed at the bottom of the circular frame (6).

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