A tensioning mechanism for brake shoe processing

Abstract

The present invention provides a tensioning mechanism for brake shoe processing, which belongs to the field of automobile brake technology. It includes a positioning plate, a bottom plate, a top block, a small positioning column, a left multi-threaded screw, a connecting rod, a left tensioning block, a clamping connecting rod, a pull rod, a right tensioning block, a clamping connecting rod pin, a large positioning column, a right multi-threaded screw, a limit plate, a sliding groove plate, a positioning pin, a support seat, a support pin, a vertical lathe spindle table, a tensioning pin and a tensioning shaft. The positioning pin is connected to the bottom plate through the positioning pin holes of the four support seats respectively, and two small positioning columns and a large positioning column are respectively installed on both sides of the bottom plate. The two ends of the clamping connecting rod are connected to the connecting rod respectively, and the middle is connected to the pull rod by the clamping connecting rod pin. The advantages are: novel structure, conversion of tensioning blocks, multi-threaded screws and connecting rods, after changing the direction of force, hydraulic clamping is used to replace the original manual clamping or other clamping methods, so that the workpiece clamping is faster, more stable and more efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile brakes, and in particular to the turning process of brake shoe friction plates in automobile brake systems with semicircular features, and occasions where axial clamping force needs to be converted into radial clamping force. Background Art

[0002] In mechanical processing, brake shoe friction pad products with semicircular features need to be turned on the outer circle. This product is usually processed on a vertical lathe. When clamping, the two brake shoes are relatively mounted on the fixture, and then the workpiece is clamped for cutting. However, due to the inherent characteristics of the brake shoe product, it is inconvenient to position and clamp. In the past, most of them used manual clamping, which was inefficient and took a long time to clamp; or used an inclined block to change the clamping direction, but at the same time, the clamping force was relatively small and the clamping process was not smooth enough. Summary of the invention

[0003] The present invention provides a tensioning mechanism for brake shoe processing to solve the problems of inconvenience in positioning and clamping caused by existing mechanical processing technology when processing brake shoes, low efficiency and long clamping time in manual clamping mode, small clamping force and insufficient smoothness of clamping process in inclined block conversion clamping mode.

[0004] The technical solution adopted by the present invention is: the locating pins are respectively connected to the base plate through the locating pin holes of the four support seats, the four support seats are placed on the positioning plate, the base plate is installed on the positioning plate through the support seats by long bolts, the center of the positioning arc surface on the support seat is concentric with the outer circle of the positioning plate, two small positioning columns and a large positioning column are respectively arranged on both sides of the base plate, a top block is arranged between the two small positioning columns, the large positioning column and the small positioning column are respectively locked by bolts through gaskets, two left-side tensioning blocks and two right-side tensioning blocks are respectively placed in the sliding grooves of the sliding groove plate, a limiting plate is installed on the sliding groove plate, the vertical limiting end of the limiting plate is arranged in the left limiting groove of the left tensioning block and the right limiting groove of the right tensioning block, so as to limit the upward movement of the tensioning block The sliding limit end on the limit plate can limit the sliding range of the tensioning block along the sliding groove. The sliding range can be adjusted by screwing the left multi-head screw and the right multi-head screw into the left tensioning block and the right tensioning block. The two ends of the left multi-head screw are respectively connected to the left multi-head threaded hole of the left tensioning block, and the two ends of the right multi-head screw are respectively connected to the right multi-head threaded hole of the right tensioning block. The structure of the left multi-head screw is the same as that of the right multi-head screw. The middle position of the left multi-head screw and the right multi-head screw is connected to the connecting rod, and the two ends of the clamping connecting rod are respectively connected to the connecting rod, and the middle is connected to the pull rod by the clamping connecting rod pin, and the support pin is connected to the support seat. The four tensioning pins are respectively installed in the left hole of the left tensioning block and the right pin hole of the right tensioning block.

[0005] The two ends of the right multi-start screw rod of the present invention are respectively left-handed threads and right-handed threads, and the middle is a polygonal structure.

[0006] The small positioning column of the present invention is provided with a small positioning column upper positioning surface and a small positioning column lower positioning surface.

[0007] The large positioning column of the present invention is provided with an upper positioning surface and a lower positioning surface.

[0008] The present invention has a bushing installed in the middle of the bottom plate.

[0009] The advantages of the present invention are: novel structure, conversion of tension block, multi-thread screw and connecting rod, etc., after changing the direction of force, hydraulic clamping is used to replace the original manual clamping or other clamping methods, so that the workpiece clamping is faster, more stable and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the present invention;

[0011] Figure 2 It is a structural schematic diagram of the left tension block of the present invention;

[0012] Figure 3 It is a structural schematic diagram of the right tension block of the present invention;

[0013] Figure 4 It is a structural schematic diagram of the sliding slot plate of the present invention;

[0014] Figure 5 It is a structural schematic diagram of the support seat of the present invention;

[0015] Figure 6 is a three-dimensional diagram of the support seat of the present invention;

[0016] Figure 7 It is a schematic diagram of the structure of the multi-head bolt of the present invention;

[0017] Figure 8 yes Figure 7 A-direction view;

[0018] Fig. 9 Schematic diagram of the limiting plate of the present invention;

[0019] Fig.10 It is a structural schematic diagram of the workpiece of the present invention;

[0020] Fig.11 It is a schematic diagram of the clamping state of a workpiece of the present invention;

[0021] Fig.12 yes Fig.11 DD cross-sectional view;

[0022] In the figure, positioning plate 1, bottom plate 2, top block 3, small positioning column 4, left multi-start screw 5, connecting rod 6, left tension block 7, clamping connecting rod 8, pull rod 9, right tension block 10, clamping connecting rod pin 11, large positioning column 12, right multi-start screw 13, limit plate 14, sliding groove plate 15, positioning pin 16, support seat 17, support pin 18, vertical lathe spindle table 19, bushing 20, tension pin 21, gasket 22, bolt 23, tension shaft 24, workpiece 25, small positioning column upper positioning surface 401, small positioning column lower positioning surface 402, left limit slot 701, left multi-start screw 13, left limit slot 702, left multi-start screw 14, right multi-start screw 15, limit plate 14, sliding groove plate 15, positioning pin 16, support seat 17, support pin 18, vertical lathe spindle table 19, bushing 20, tension pin 21, gasket 22, bolt 23, tension shaft 24, workpiece 25, small positioning column upper positioning surface 401, small positioning column lower positioning surface 402, left limit slot 701, left multi-start screw 13, left limit slot 702, left limit slot 701, left limit slot 702, left limit slot 703, left limit slot 704, left limit slot 705, left limit slot 706, left limit slot 707, left limit slot 708, left limit slot 709, left limit slot 709, left limit slot 709, left limit slot 701, left limit slot 701, left limit slot 702, left limit slot 703, left limit slot 704, left limit slot 705, left limit slot 706, left limit slot 707, left limit slot 708 Head threaded hole 702, left pin hole 703, right limiting groove 1001, right multi-threaded hole 1002, right pin hole 1003, upper positioning surface 1201, lower positioning surface 1202, left-handed thread 1301, right-handed thread 1302, sliding direction limiting end 1401, vertical direction limiting end 1402, sliding groove 1501, positioning pin hole 1701, positioning arc surface 1702, upper rib plate 2501, large semicircular arc 2502, lower rib plate 2503, hole one 2504 on the rib plate, hole two 2505 on the rib plate, small semicircular arc 2506, friction plate 2507. DETAILED DESCRIPTION

[0023] The positioning pins 16 are connected to the base plate 2 through the positioning pin holes 1701 of the four support seats 17, respectively. The four support seats 17 are placed on the positioning plate 1, and the base plate 2 is installed on the positioning plate 1 through the support seats 17 by long bolts. The center of the positioning arc 1702 on the support seat 17 is concentric with the outer circle of the positioning plate 1, which can realize rapid positioning, replacement and installation. Two small positioning columns 4 and a large positioning column 12 are respectively installed on both sides of the base plate 2, and a top block 3 is installed between the two small positioning columns 4. The large positioning column 12 and the small positioning column 4 are respectively locked by bolts 23 through gaskets 22. The two left tensioning blocks 7 and the two right tensioning blocks 10 are respectively placed in the sliding grooves 1501 of the sliding groove plate 15, and a limiting plate is installed on the sliding groove plate 15 14, the vertical limit end 1402 of the limit plate 14 is installed in the left limit groove 701 of the left tension block 7 and the right limit groove 1001 of the right tension block 10 to limit the upward movement of the tension block. The sliding limit end 1401 on the limit plate 14 can limit the sliding range of the tension block along the sliding groove 1510. The sliding range can be adjusted by screwing the left multi-threaded screw 5 and the right multi-threaded screw 13 into the left tension block 7 and the right tension block 10. The two ends of the left multi-threaded screw 5 are respectively connected to the left multi-threaded hole 702 of the left tension block 7, and the two ends of the right multi-threaded screw 13 are respectively connected to the right multi-threaded hole 1002 of the right tension block 10. The two ends of the right multi-threaded screw 13 are respectively left-handed threads 1301 and right-handed thread 1302, with a polygonal structure in the middle; the structure of the left multi-start screw 5 is the same as that of the right multi-start screw 13, and the middle position of the left multi-start screw 5 and the right multi-start screw 13 is connected to the connecting rod 6. The left-handed thread 1301 and the right-handed thread 1302 are used to realize that when the multi-start screw is rotated, the tension blocks connected at both ends can be moved inward or outward at the same time; the polygonal structure is used in the middle, one is to realize the connection with the connecting rod 6, and the other is to facilitate the adjustment of the position of the connecting rod 6. The more sides of the polygon, the smaller the adjustable angle; the multi-start screw is used to make the screw have a large lead, that is, when the connecting rod 6 rotates through a smaller angle, the multi-start screw drives the tension block to achieve a larger range of movement, and the pressure The two ends of the tightening link 8 are respectively connected to the connecting rod 6, and the middle is connected to the pull rod 9 by the tightening link pin 11. The threaded end of the pull rod 9 is connected to the tightening shaft 24, and the tightening shaft 24 is connected to the hydraulic cylinder shaft in the main shaft of the lathe. A bushing 20 is installed in the middle of the base plate 2. The function of the bushing 20 is that it can be easily replaced when it is worn, and secondly, it is to ensure that the pull rod 9 is stable and does not deviate when moving up and down. The support pin 18 is connected to the support seat 17, and the four tightening pins 21 are respectively installed in the left hole 703 of the left tightening block 7 and the right pin hole 1003 of the right tightening block 10. The small positioning column 4 has a small positioning column upper positioning surface 401 and a small positioning column lower positioning surface 402, and the large positioning column 12 has an upper positioning surface 1201 and a lower positioning surface 1202.

[0024] Working principle:

[0025] The workpiece 25 being processed has an upper rib plate 2501, a large semicircular arc 2502, a lower rib plate 2503, a hole 1 2504, a hole 2505, a small semicircular arc 2506, and a friction plate 2507. The upper rib plate 2501 and the lower rib plate 2503 each have two holes, hole 1 2504 and hole 2505. The distances between hole 1 2504 and hole 2 2505 relative to the center of the circle are unequal.

[0026] When turning the brake shoe friction plate 2507 of the workpiece 25, first install the positioning plate 1 of the clamping mechanism on the spindle worktable 19 of the vertical lathe, align the rotation center of the positioning plate 1 to be coaxial with the lathe spindle, and then install the installed clamping mechanism on the positioning plate 1. During installation, the support seat 17 is directly placed on the positioning plate 1 to quickly achieve repeated positioning and installation.

[0027] Install the two workpieces 25 onto the fixture from the outside of the fixture respectively, and place the lower edge of the workpiece 25 on the support pin 18 of the support seat 17. The large semicircular arc 2502 of the workpiece 25 contacts the upper positioning surface 1201 and the lower positioning surface 1202 of the large positioning column 12 respectively, and the small semicircular arc 2506 contacts the upper positioning surface 401 and the lower positioning surface 402 of the small positioning column 4 respectively to complete the positioning. Then, pass the two tensioning pins 21 through the hole 1 2504 on the workpiece 25 and the left hole 703 on the left tensioning block 7 respectively, and pass the two tensioning pins 21 through the hole 2 2505 on the workpiece 25 and the right pin hole 1003 on the right tensioning block 10 respectively.

[0028] When the hydraulic clamping switch is pressed, the tensioning shaft 24 drives the pull rod 9 to move downward under the action of the hydraulic tension, and the pull rod 9 drives the clamping connecting rod 8 to move downward. Under the action of the clamping connecting rod 8, the connecting rods 6 on the left and right sides rotate around the left multi-threaded screw 5 and the right multi-threaded screw 13 respectively, and slide inward along the long groove on the clamping connecting rod 8, close to the center of the clamp. Since one end of the multi-threaded screw is a left thread and the other end is a right thread, the multi-threaded screw drives the left tensioning block 7 and the right tensioning block 10 to move inward along the sliding groove plate 15. The left tensioning block 7 and the right tensioning block 10 tighten the workpiece 25 through the tensioning pin 21, completing the positioning clamping, and the friction plate 2507 on the outer surface of the brake shoe can be cut.

[0029] When releasing the workpiece 25, press the hydraulic release switch, the tensioning shaft 24 drives the pull rod 9 to move upward, and the compression connecting rod 8 drives the left and right side connecting rods 6 to rotate outward around the left multi-threaded screw 5 and the right multi-threaded screw 13 respectively, away from the center of the clamp, and the left tensioning block 7 and the right tensioning block 10 move outward along the sliding groove plate 15 under the action of the multi-threaded screw. The left tensioning block 7, the right tensioning block 10 and the tensioning pin 21 are in the released position. At this time, the workpiece 25 can be removed, the pull rod pin 21 on the rib plate of the workpiece 25 is pulled out, and the workpiece 25 is removed.

Claims

1. A tensioning mechanism for brake shoe processing, characterized in that: The locating pins are connected to the base plate through the locating pin holes of the four support seats respectively, and the four support seats are placed on the locating plate. The base plate is installed on the locating plate through the support seats by long bolts. The center of the locating arc on the support seat is concentric with the outer circle of the locating plate. Two small locating columns and a large locating column are respectively installed on both sides of the base plate. A top block is installed between the two small locating columns. The large locating column and the small locating column are respectively locked by bolts through gaskets. The two left tensioning blocks and the two right tensioning blocks are respectively placed in the sliding grooves of the sliding groove plate. A limit plate is installed on the sliding groove plate. The vertical limit end of the limit plate is installed in the left limit groove of the left tensioning block and the right limit groove of the right tensioning block to limit the upward movement of the tensioning block. The sliding on the limit plate The dynamic limit end can limit the sliding range of the tensioning block along the sliding groove, and the sliding range can be adjusted by screwing the left multi-thread screw and the right multi-thread screw into the left tensioning block and the right tensioning block. The two ends of the left multi-thread screw are respectively connected to the left multi-threaded hole of the left tensioning block, and the two ends of the right multi-thread screw are respectively connected to the right multi-threaded hole of the right tensioning block. The structure of the left multi-thread screw is the same as that of the right multi-thread screw. The middle position of the left multi-thread screw and the right multi-thread screw is connected to the connecting rod, and the two ends of the clamping connecting rod are respectively connected to the connecting rod, and the middle is connected to the pulling rod by the clamping connecting rod pin, and the support pin is connected to the support seat. The four tensioning pins are respectively installed in the left hole of the left tensioning block and the right pin hole of the right tensioning block; The two ends of the right multi-start screw are left-handed threads and right-handed threads respectively, and the middle is a polygonal structure; The small positioning column has an upper positioning surface and a lower positioning surface. The large positioning column is provided with an upper positioning surface and a lower positioning surface.

2. A tensioning mechanism for brake shoe processing according to claim 1, characterized in that: A bushing is installed in the middle of the base plate.

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