CN113333863B

CN113333863B - Drum brake block chamfering equipment

Info

Publication number: CN113333863B
Application number: CN202110633707.6A
Authority: CN
Inventors: 龙道发
Original assignee: Hubei Longyun Automobile Fittings Co ltd
Current assignee: Hubei Longyun Automobile Fittings Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-11-04
Anticipated expiration: 2041-06-07
Also published as: CN113333863A

Abstract

The invention relates to the technical field of automobile part manufacturing, and discloses drum brake pad chamfering equipment which comprises a rack, a feeding frame arranged on the rack, a conveying platform arranged on the rack, a rotating shaft rotationally connected to the rack, a driving motor driving the rotating shaft to rotate, a chamfering motor arranged on the rack, and a chamfering tool arranged on an output shaft of the chamfering motor, wherein the conveying platform is slidably connected with a material pushing seat, and the motion track of the material pushing seat is positioned below the feeding frame. The invention has the following advantages and effects: the material pushing seat pushes the drum brake pad in the material loading frame to leave the material loading frame, the feeding pressing wheel drives the drum brake pad of the conveying platform to move forwards, the pressing mechanism presses the drum brake pad downwards, the chamfering tool performs chamfering processing on the drum brake pad pressed downwards by the pressing mechanism, the automation degree is high, and the chamfering processing efficiency is high.

Description

Drum brake block chamfering equipment

Technical Field

The invention belongs to the technical field of automobile part manufacturing, and particularly relates to drum brake pad chamfering equipment.

Technical Field

The automobile brake pad is also called as automobile brake shoe, and refers to a friction material fixed on a brake drum or a brake disc rotating with a wheel, wherein a friction lining and a friction block bear external pressure to generate friction action so as to achieve the aim of reducing the speed of the automobile. From the braking type, brake pads for disc brakes, brake pads for drum brakes, brake pads for large trucks can be classified. The drum brake block needs to be chamfered in the manufacturing process so as to meet the requirements of heat dissipation and convenience in dust falling. At present, in the prior art, chamfering is carried out on the workpiece in a manual or semi-manual mode, and the processing efficiency is low.

Disclosure of Invention

The invention aims to provide chamfering equipment for a drum brake pad, which has the effects of high automation degree and high chamfering processing efficiency.

The technical purpose of the invention is realized by the following technical scheme: a drum brake pad chamfering device comprises a rack, a feeding frame arranged on the rack, a conveying platform arranged on the rack, a rotating shaft rotationally connected to the rack, a driving motor driving the rotating shaft to rotate, a chamfering motor arranged on the rack, and a chamfering cutter arranged on an output shaft of the chamfering motor, wherein the conveying platform is slidably connected with a material pushing seat, the motion track of the material pushing seat is located below the feeding frame, and the material pushing seat is linked with the rotating shaft; the frame is rotatably connected with a feeding shaft, a feeding pinch roller positioned above the conveying platform is fixed on the feeding shaft, and the feeding shaft is linked with the rotating shaft; and a pressing mechanism is fixed on the rack and used for pressing the drum brake pads on the conveying platform downwards so as to facilitate chamfering processing of the chamfering tool.

Through adopting above-mentioned technical scheme, on a plurality of drum brake block piles the material loading frame, the drum brake block diapire of below supports on conveying platform. The driving motor drives the rotating shaft to rotate, and the rotating shaft drives the material pushing seat to slide on the conveying platform in a reciprocating mode. The material pushing seat moves forwards to push the drum brake pad at the lowest position in the material loading frame to move forwards and leave the material loading frame, the material pushing seat moves backwards again, and the rest drum brake pads in the material loading frame descend under the action of gravity and abut against the conveying platform. The feeding shaft drives the feeding pressing wheel to rotate, the feeding pressing wheel is pressed on the drum brake pad on the conveying platform and conveys the drum brake pad forwards to the pressing mechanism, the pressing mechanism presses the drum brake pad, and the chamfering motor drives the chamfering tool to rotate to chamfer the drum brake pad. The degree of automation is high, and chamfer machining efficiency is high.

The invention is further provided with: the rack is rotatably connected with a transmission shaft, a first driven gear is fixed on the transmission shaft, a first driving gear is fixed on the rotating shaft, and the first driving gear is meshed with the first driven gear; the first driven gear is hinged to a first connecting rod, and the first connecting rod is hinged to the material pushing seat.

Through adopting above-mentioned technical scheme, the pivot rotates and drives the transmission shaft rotation, and the transmission shaft drives the reciprocating sliding of ejector pad through the connecting rod.

The invention is further configured as follows: and a second driving gear is fixed on the rotating shaft, a second driven gear is fixed on the feeding shaft, and the second driving gear is meshed with the second driven gear.

Through adopting above-mentioned technical scheme, the pivot rotates and drives the pay-off axle and rotate.

The invention is further configured as follows: the conveying platform is provided with a vertical mounting hole, a sliding rod is connected in the mounting hole in a sliding manner, a buffer spring is fixed at the upper end of the sliding rod, a damping guide block is fixed on the material pushing seat, a damping arc surface is formed at the upper end of the damping guide block, and the lower end of the sliding rod abuts against the damping arc surface; when the damping guide block moves along with the material pushing seat, the sliding rod and the buffer spring are guided to ascend and then contact drum brake pads in the material loading frame.

By adopting the technical scheme, when the pushing seat pushes the lowest drum brake pad to leave the feeding frame and the pushing seat leaves the lower part of the feeding frame, the rest drum brake pads in the feeding frame descend and directly descend and impact on the conveying platform, and the problems that firstly, the total weight of a plurality of drum brake pads is large, the conveying platform and the frame vibrate after impact, and the running stability of chamfering equipment is influenced exist; secondly, the conveying platform is easy to bump out of the pit and deform; and thirdly, the drum brake pad is easy to collide, and the quality of the drum brake pad is influenced.

Therefore, when the material pushing seat leaves the lower part of the material loading frame, the damping cambered surface of the damping guide block is guided to ascend towards the sliding rod, the damping guide block drives the buffer spring to ascend and then contact the drum brake pad in the material loading frame, and the drum brake pad contacts and extrudes the buffer spring. The damping cambered surface guides the sliding rod to descend to drive the buffer spring to descend, the drum brake pad in the feeding frame descends onto the conveying platform, the buffering effect is achieved in the process, and the buffer spring is separated from the drum brake pad after the buffering is finished.

The invention is further provided with: the mounting hole comprises an upper hole channel and a lower hole channel, the diameter of the upper hole channel is larger than that of the lower hole channel, the sliding rod is in threaded connection with a limiting nut, the limiting nut is located in the upper hole channel, the cross section of the limiting nut is larger than that of the lower hole channel, and the buffer spring is located in the upper hole channel.

The invention is further provided with: a sliding seat is connected below the conveying platform in a sliding manner, the rack is connected with a linkage shaft in a rotating manner, power is transmitted between the linkage shaft and the rotating shaft through a belt, a linkage crank is fixed on the linkage shaft, the linkage crank is hinged with a second connecting rod, and the second connecting rod is hinged with the sliding seat; the sliding seat is hinged with a shifting sheet, the conveying platform is provided with a notch, and the shifting sheet upwards penetrates through the notch; the sliding seat is provided with a limiting part and a retaining spring, and the retaining spring elastically drives the shifting piece to abut against the limiting part; when the sliding seat moves forwards, the poking piece pokes the drum brake pad to move forwards; when the sliding seat moves reversely, the poking sheet contacts the drum brake sheet and then turns over and slides through the bottom wall of the drum brake sheet.

By adopting the technical scheme, the thicknesses of the drum brake pads in the same batch can be the same or different. When the feeding pinch roller is used for conveying the drum brake pad, and when the feeding pinch roller cannot convey the drum brake pad forwards, the linkage shaft is driven to rotate through the rotating shaft, the linkage shaft drives the sliding seat to move through the linkage crank and the connecting rod II, and the sliding seat moves forwards and backwards in a reciprocating mode. The forward direction refers to the conveying forward direction of the drum brake pad on the conveying platform. When the sliding seat moves forwards, the poking sheet penetrates through the notch and then is abutted against the end part of the drum brake block in the front, and the back of the poking sheet is abutted against the limiting part to push the drum brake block to move forwards. When the sliding seat moves backwards, the back surface of the poking sheet is contacted with the next drum brake sheet and then overturned, the poking sheet slides through the bottom wall of the next drum brake sheet and then moves to the end part of the next drum brake sheet, the poking sheet overturns to abut against the limiting part under the action of the elastic force of the retaining spring, the front surface of the poking sheet abuts against the end part of the next drum brake sheet again, and the drum brake sheets are conveyed forwards continuously.

The invention is further configured as follows: the frame is equipped with belt straining device, belt straining device including articulate in the tensioning frame of frame, threaded connection in the adjusting screw of frame, adjusting screw one end is fixed with the lantern ring, the lantern ring cover is in on the tensioning frame.

The invention has the beneficial effects that:

1. the material pushing seat pushes the drum brake pad in the material loading frame to leave the material loading frame, the feeding pressing wheel drives the drum brake pad of the conveying platform to move forwards, the pressing mechanism presses the drum brake pad downwards, the chamfering tool performs chamfering processing on the drum brake pad pressed downwards by the pressing mechanism, the automation degree is high, and the chamfering processing efficiency is high.

2. The rotating shaft is adopted to drive the transmission shaft, the transmission shaft drives the material pushing seat to reciprocate through the first driven gear and the connecting rod, and no power mechanism is independently arranged, so that the manufacturing cost of chamfering equipment is reduced, and the energy consumption during use is saved.

3. Set up the shock attenuation guide block on the pusher seat, the motion of slide bar and buffer spring can be led to the shock attenuation guide block, play the buffering when going up work or material rest interior drum type brake block and descend, the cushioning effect, drum type brake block descends and accomplishes the back, buffer spring and drum type brake block separation, avoid disturbing the ejection of compact of last work or material rest interior drum type brake block, to the striking of conveying platform and frame, vibrations when reducing the interior drum type brake block of last work or material rest and descending, make chamfering equipment operation more steady, can also reduce the striking wearing and tearing of drum type brake block simultaneously.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a first structural diagram of the present invention.

FIG. 2 is a second structural diagram of the present invention.

FIG. 3 is a schematic view of the structural relationship among the transmission shaft, the first connecting rod, the material pushing seat and the damping guide block.

Fig. 4 is a schematic view showing the structural relationship among the mounting hole, the slide bar, and the buffer spring according to the present invention.

Fig. 5 is a schematic view of the structural relationship between the belt tensioner, the slider, the paddle, and the retaining spring of the present invention.

In the figure, 1, a frame; 11. a drive motor; 12. a feeding shaft; 121. feeding pinch rollers; 122. a driven gear II; 13. a hold-down mechanism; 131. a pressing frame; 132. a compression sheet; 133. a compression spring; 134. a limiting column; 135. a limiting hole; 14. a rotating shaft; 141. driving a gear I; 142. driving a gear II; 2. a feeding frame; 3. a conveying platform; 31. mounting holes; 311. an upper duct; 312. a lower duct; 32. a slide bar; 321. a limit nut; 33. a buffer spring; 34. a chute; 4. a material pushing seat; 41. a shock-absorbing guide block; 411. a shock absorbing arc surface; 5. a drive shaft; 51. a first driven gear; 52. a first connecting rod; 6. a linkage shaft; 61. a linkage crank; 62. a second connecting rod; 63. a belt; 64. a belt tensioning mechanism; 641. a tensioning frame; 642. adjusting the screw rod; 6421. a collar; 7. a slide base; 71. a shifting sheet; 72. a retention spring; 73. a limiting part; 8. chamfering the motor; 81. chamfering the cutter; 9. a drum brake pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

The utility model provides a drum brake block chamfer equipment, as shown in figure 1, figure 2, figure 3, includes frame 1, install in the last work or material rest 2 of frame 1, install at the conveying platform 3 of frame 1, rotate and connect in the pivot 14 of frame 1, drive pivot 14 pivoted driving motor 11, install in the chamfer motor 8 of frame 1, install the chamfer cutter 81 at the chamfer motor 8 output shaft. The conveying platform 3 is connected with a material pushing seat 4 in a sliding mode, and the motion trail of the material pushing seat 4 is located below the upper material rack 2. The lower end of the feeding frame 2 is a blanking port. The rack 1 is rotatably connected with a transmission shaft 5, a driven gear I51 is fixed on the transmission shaft 5, a driving gear I141 is fixed on the rotating shaft 14, and the driving gear I141 is meshed with the driven gear I51. The first driven gear 51 is hinged with a first connecting rod 52, and the first connecting rod 52 is hinged with the material pushing seat 4. The driving motor 11 drives the rotating shaft 14 to rotate, the rotating shaft 14 drives the transmission shaft 5 to rotate, and the driven gear I51 and the connecting rod I52 drive the material pushing seat 4 to do linear reciprocating motion.

As shown in fig. 3 and 4, the conveying platform 3 is provided with a plurality of mounting holes 31, and the mounting holes 31 are formed in the vertical direction. The mounting hole 31 includes an upper hole 311 and a lower hole 312, both the upper hole 311 and the lower hole 312 are circular holes, and the diameter of the upper hole 311 is larger than that of the lower hole 312. A sliding rod 32 is arranged in the mounting hole 31, and the lower end of the sliding rod 32 passes through the mounting hole 31 and then is positioned below the conveying platform 3. The sliding rod 32 is connected with a limiting nut 321 through a thread, the limiting nut 321 is positioned in the upper duct 311, and the cross section of the limiting nut 321 is larger than that of the lower duct 312, so that the sliding rod 32 cannot fall out of the mounting hole 31. The upper end of the sliding rod 32 is fixed with a buffer spring 33, and the buffer spring 33 is positioned in the upper hole 311. The conveying platform 3 is provided with a chute 34, and the chute 34 penetrates through the conveying platform 3. The material pushing seat 4 is slidably connected to the chute 34. The lower terminal surface of the material pushing seat 4 is fixed with a shock absorption guide block 41, the upper end of the shock absorption guide block 41 is formed with a shock absorption cambered surface 411, and the lower end of the sliding rod 32 is abutted against the shock absorption cambered surface 411.

A plurality of drum brake block 9 stack is in last work or material rest 2, and the drum brake block 9 of the bottommost is placed on conveying platform 3. The material pushing seat 4 is close to and pushes the drum brake block 9 to leave the feeding frame 2 from the side of the feeding frame 2, and then the drum brake block is reset in the reverse movement. At this time, the damping arc 411 of the damping guide block 41 guides the sliding rod 32 to ascend, drives the buffer spring 33 to ascend and then protrude out of the mounting hole 31 to contact with the rest of the drum brake pads 9 in the feeding frame 2, and the rest of the drum brake pads 9 in the feeding frame 2 descend under the action of gravity and extrude the buffer spring 33 to play a role in buffering, so that the drum brake pads 9 in the feeding frame 2 are prevented from directly impacting the conveying platform 3 when descending. The damping guide block 41 continues to move along with the material pushing seat 4, the sliding rod 32 descends to drive the buffer spring 33 to descend and then enter the mounting hole 31, and at the moment, the drum brake pad 9 in the material loading frame 2 descends to the conveying platform 3.

As shown in fig. 2, a feeding shaft 12 is rotatably connected to the frame 1, and the feeding shaft 12 is located above the conveying platform 3. The second driven gear 122 is fixed on the feeding shaft 12, the second driving gear 142 is fixed on the rotating shaft 14, and the second driving gear 142 is meshed with the second driven gear 122. A feeding pressing wheel 121 is fixed on the feeding shaft 12, and the feeding pressing wheel 121 is used for abutting against the upper wall of the drum brake pad 9 on the conveying platform 3 and conveying the drum brake pad 9 forwards. The pressing mechanism 13 is arranged on the frame 1, the pressing mechanism 13 is positioned above the conveying platform 3, the pressing mechanism 13 comprises a pressing frame 131, a pressing sheet 132 and a plurality of pressing springs 133, the pressing frames are fixed on the frame 1, the lower ends of the pressing springs 133 are fixed on the pressing sheet 132, and the upper ends of the pressing springs are fixed on the pressing frame 131. The pressing frame 131 is provided with a limiting hole 135, the pressing sheet 132 is fixed with a limiting column 134, the limiting column 134 upwards penetrates through the limiting hole 135, and the pressing spring 133 is sleeved on the limiting column 134.

After the material pushing seat 4 pushes the drum brake pad 9 to leave the material loading frame 2, the feeding pressing wheel 121 presses the drum brake pad 9 and conveys the drum brake pad forward, the drum brake pad 9 enters the pressing piece 132 and is pressed downwards by the pressing piece 132, and the chamfering motor 8 drives the chamfering tool 81 to rotate to chamfer the drum brake pad 9.

As shown in fig. 2 and 5, a sliding seat 7 is connected below the conveying platform 3 in a sliding manner, the frame 1 is rotatably connected with a linkage shaft 6, a first belt pulley is fixed on the linkage shaft 6, a second belt pulley is fixed on the transmission shaft 5, and a belt 63 for transmitting power is arranged between the first belt pulley and the second belt pulley. A linkage crank 61 is fixed on the linkage shaft 6, the linkage crank 61 is hinged with a second connecting rod 62, and the second connecting rod 62 is hinged with the sliding seat 7. The sliding seat 7 is hinged with a shifting sheet 71, the conveying platform 3 is provided with a notch, and the shifting sheet 71 upwards penetrates through the notch and then is positioned above the conveying platform 3. The slide base 7 is provided with a limiting part 73 and a holding spring 72, one end of the holding spring 72 is fixed on the slide base 7, the other end of the holding spring 72 is fixed on the shifting piece 71, and the elastic force of the holding spring 72 drives the shifting piece 71 to abut against the limiting part 73. The frame 1 is provided with a belt tensioning mechanism 64, the belt tensioning mechanism 64 comprises a tensioning frame 641 hinged to the frame 1 and an adjusting screw 642 in threaded connection with the frame 1, one end of the adjusting screw 642 is fixed with a collar 6421, and the collar 6421 is sleeved on the tensioning frame 641.

During chamfering, the drum brake pads 9 of the same batch may or may not have the same thickness. When the drum brake pads 9 on the conveying platform 3 are driven by the feeding pinch roller 121 to be conveyed forwards, once the feeding pinch roller 121 conveys the drum brake pads 9 on the fixed conveying platform 3 forwards, the adjusting screw 642 can be manually adjusted, and the belt 63 is tensioned between the first belt pulley and the second belt pulley after the tensioning frame 641 is driven by the adjusting screw 642 to be turned over. The rotating shaft 14 drives the linkage shaft 6 to rotate, the linkage shaft 6 drives the linkage crank 61 to rotate, the linkage crank 61 drives the sliding seat 7 to reciprocate through the second connecting rod 62, and the sliding seat 7 continuously moves forwards and backwards. When the sliding seat 7 moves forward, the shifting sheet 71 passes through the notch and is located at the end part of the drum brake pad 9 on the conveying platform 3, and the shifting sheet 71 abuts against the limiting part 73 to push the drum brake pad 9 to move forward. When the slide carriage 7 moves backwards, the shifting piece 71 contacts the next drum brake 9 and then turns over and slides over the bottom wall of the next drum brake 9, and the shifting piece 71 turns over and abuts against the limiting part 73 under the action of the elastic force of the retaining spring 72. When the slide 7 is moved forward again, the pusher 71 abuts the end of the next drum brake 9 and pushes it forward. When the feeding pinch roller 121 can normally convey the drum brake 9 forward, the adjusting screw 642 is adjusted to drive the tensioning frame 641 to swing, so that the belt 63 is separated from the belt 63 wheel one, and the linkage shaft 6 is not driven by the rotating shaft 14 any more.

Claims

1. The utility model provides a drum brake piece chamfer equipment which characterized in that: the automatic feeding device comprises a rack (1), a feeding frame (2) arranged on the rack (1), a conveying platform (3) arranged on the rack (1), a rotating shaft (14) rotationally connected to the rack (1), a driving motor (11) driving the rotating shaft (14) to rotate, a chamfering motor (8) arranged on the rack (1), and a chamfering cutter (81) arranged on an output shaft of the chamfering motor (8), wherein the conveying platform (3) is slidably connected with a material pushing seat (4), the movement track of the material pushing seat (4) is positioned below the feeding frame (2), and the material pushing seat (4) is linked with the rotating shaft (14); the frame (1) is rotatably connected with a feeding shaft (12), a feeding pinch roller (121) positioned above the conveying platform (3) is fixed on the feeding shaft (12), and the feeding shaft (12) is linked with the rotating shaft (14); the chamfering tool comprises a rack (1), and is characterized in that a pressing mechanism (13) is fixed on the rack (1), the pressing mechanism (13) is used for pressing a drum brake block (9) on a conveying platform (3) downwards so as to facilitate chamfering of a chamfering tool (81), the conveying platform (3) is provided with a vertical mounting hole (31), a sliding rod (32) is connected in the mounting hole (31) in a sliding mode, a buffer spring (33) is fixed at the upper end of the sliding rod (32), a damping guide block (41) is fixed on a material pushing seat (4), a damping arc surface (411) is formed at the upper end of the damping guide block (41), and the lower end of the sliding rod (32) abuts against the damping arc surface (411); when the damping guide block (41) moves along with the material pushing seat (4), the sliding rod (32) and the buffer spring (33) are guided to ascend and then contact with drum brake pads (9) in the material loading frame (2), the rack (1) is provided with a belt tensioning mechanism (64), the belt tensioning mechanism (64) comprises a tensioning frame (641) hinged to the rack (1) and an adjusting screw (642) in threaded connection with the rack (1), one end of the adjusting screw (642) is fixedly provided with a sleeve ring (6421), the sleeve ring (6421) is sleeved on the tensioning frame (641), and once the drum brake pads (9) on the conveying platform (3) are conveyed forwards under the driving of the feeding pinch roller (121), the adjusting screw (642) can be manually adjusted, and the adjusting screw (642) drives the tensioning frame (641) to overturn so that the belt (63) is tensioned between a first belt pulley and a second belt pulley.

2. The drum brake pad chamfering apparatus according to claim 1, wherein: the rack (1) is rotatably connected with a transmission shaft (5), a first driven gear (51) is fixed on the transmission shaft (5), a first driving gear (141) is fixed on the rotating shaft (14), and the first driving gear (141) is meshed with the first driven gear (51); the first driven gear (51) is hinged with a first connecting rod (52), and the first connecting rod (52) is hinged with the material pushing seat (4).

3. The drum brake pad chamfering apparatus according to claim 2, wherein: a second driving gear (142) is fixed on the rotating shaft (14), a second driven gear (122) is fixed on the feeding shaft (12), and the second driving gear (142) is meshed with the second driven gear (122).

4. The drum brake pad chamfering apparatus according to claim 1, wherein: the mounting hole (31) comprises an upper hole channel (311) and a lower hole channel (312), the diameter of the upper hole channel (311) is larger than that of the lower hole channel (312), the sliding rod (32) is in threaded connection with a limiting nut (321), the limiting nut (321) is located in the upper hole channel (311), the cross section of the limiting nut (321) is larger than that of the lower hole channel (312), and the buffer spring (33) is located in the upper hole channel (311).

5. A drum brake pad chamfering apparatus as claimed in claim 1, 2 or 3, wherein: a sliding seat (7) is connected below the conveying platform (3) in a sliding manner, the rack (1) is rotatably connected with a linkage shaft (6), power is transmitted between the linkage shaft (6) and the rotating shaft (14) through a belt (63), a linkage crank (61) is fixed on the linkage shaft (6), a second connecting rod (62) is hinged to the linkage crank (61), and the second connecting rod (62) is hinged to the sliding seat (7); the sliding seat (7) is hinged with a shifting sheet (71), the conveying platform (3) is provided with a notch, and the shifting sheet (71) upwards penetrates through the notch; the sliding seat (7) is provided with a limiting part (73) and a retaining spring (72), and the retaining spring (72) drives the shifting piece (71) to abut against the limiting part (73) through elasticity; when the sliding seat (7) moves forwards, the poking sheet (71) pokes the drum brake sheet (9) to move forwards; when the sliding seat (7) moves backwards, the poking sheet (71) is turned over after contacting the drum brake block (9) and slides through the bottom wall of the drum brake block (9).