A brake shoe riveting machine

Abstract

The present invention provides a brake shoe riveting machine, comprising a frame, a riveting device for riveting rivets on the brake shoe, and a tooling device for fixing the brake shoe, the riveting device comprising a riveting frame, a feeding mechanism, a pressing mechanism and a translation mechanism, the tooling device comprising a positioning mechanism, a rotating mechanism and a lifting mechanism; the translation mechanism comprises a transverse slide rail horizontally fixed on the frame, a translation motor fixed on the back of the frame, a driven wheel rotatably connected to the frame and a driving wheel fixed on the output shaft of the translation motor, the driving wheel and the driven wheel are sleeved with an annular belt for power connection, synchronization blocks are respectively fixed on the upper and lower sides of the belt, the riveting frame has two and both are embedded in the transverse slide rail and slide horizontally along the transverse slide rail, and the two riveting frames are respectively fixed to one end of their respective synchronization blocks. Fully automatic riveting, high degree of automation, the two riveting frames are automatically moved closer or farther from each other through the translation mechanism, and two riveting holes can be riveted at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting machines and relates to a brake shoe riveting machine. Background Art

[0002] The brake shoe is one of the brake parts of the car. It refers to the accessories that are pushed outward by the action of the brake cam or push rod to press the brake drum to brake. The brake shoe is shaped like a half-moon. When the brake is applied, the two half-moon-shaped brake shoes are stretched outward under the action of the brake wheel cylinder, supporting the brake shoes and rubbing against the inner wall of the brake drum to slow down or stop the car. The brake shoe is composed of a friction plate and a brake pad riveted together. The friction plate and the brake pad have riveting holes at corresponding positions. Usually, a brake shoe device is used to punch rivets into the rivet holes to rivet the friction plate and the brake pad together.

[0003] Since the brake shoe is arc-shaped, it is not easy to rivet all the rivets at one time. Therefore, the existing brake shoe riveting device places the shoe at the riveting position and rivets it one by one using a press head. The riveting positions are uneven and the riveting speed is slow. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide a brake shoe riveting machine with high riveting speed and high automation.

[0005] The object of the present invention can be achieved by the following technical solutions: A brake shoe riveting machine, comprising a frame, a riveting device for riveting rivets on the brake shoe, and a tooling device for fixing the brake shoe, characterized in that the riveting device comprises a riveting frame, a feeding mechanism, a pressing mechanism and a translation mechanism, and the tooling device comprises a positioning mechanism, a rotating mechanism and a lifting mechanism;

[0006] The feeding mechanism comprises a silo vibrating plate fixed on the top of the riveting frame, a feeding slideway embedded in the riveting frame, a discharge cylinder and a discharge clamp, the upper end of the feeding slideway is connected to the discharge port of the silo vibrating plate, the discharge cylinder is fixed on the riveting frame, the push rod of the discharge cylinder is connected to the discharge clamp, the discharge clamp is embedded in the feeding slideway to prevent the rivet from continuing to slide, and the rivet can slide down along the feeding slideway when the discharge clamp moves;

[0007] The pressing mechanism comprises a pressing cylinder fixed on the top of the riveting frame, a pressing rod, and a rivet clamping assembly, the upper end of the pressing rod is connected to the push rod of the pressing cylinder, the rivet clamping assembly comprises a clamping seat, a left clamping block, a right clamping block and an elastic pressing sheet, the clamping seat is provided with a through hole for the pressing rod to pass through, the left clamping block and the right clamping block are swingably connected to the clamping seat, the upper ends of the two elastic pressing sheets are respectively fixed on both sides of the clamping seat, the lower ends of the two elastic pressing sheets are respectively against the outer sides of the left clamping block and the right clamping block and drive the left clamping block and the right clamping block to approach each other, the inner sides of the left clamping block and the right clamping block are provided with clamping grooves, and the outlet of the feeding slideway faces the clamping grooves;

[0008] The translation mechanism includes a transverse slide rail horizontally fixed on the frame, a translation motor fixed on the back of the frame, a driven wheel rotatably connected to the frame, and a driving wheel fixed on the output shaft of the translation motor. The driving wheel and the driven wheel are covered with an annular belt for power connection. Synchronous blocks are respectively fixed on the upper and lower sides of the belt. The riveting frame has two riveting frames, both of which are embedded in the transverse slide rail and slide horizontally along the transverse slide rail. The two riveting frames are respectively fixed to one end of their respective synchronous blocks.

[0009] The positioning mechanism includes a rotating wheel, a clamping cylinder and a positioning column that can be inserted into the positioning hole on the brake shoe, the positioning column is fixed on the wheel surface of the rotating wheel, the clamping cylinder has two and is fixed on the rotating wheel, and a clamping block is fixed on the push rod of the clamping cylinder, and the clamping block can abut against the surface of the brake shoe; the rotating mechanism includes a lifting seat, a rotating motor and a rotating shaft, the rotating motor is fixed on the lifting seat, a rotating seat is vertically fixed on the lifting seat, the rotating shaft is penetrated on the rotating seat and is rotatably connected to the rotating seat, one end of the rotating shaft is fixed to the output shaft of the rotating motor, and the other end of the rotating shaft is fixed to the center hole of the rotating wheel; the lifting mechanism includes a lifting cylinder fixed to the bottom of the frame, a longitudinal guide rail vertically fixed to the frame, and the lifting seat is embedded in the longitudinal guide rail and slides up and down along the longitudinal guide rail.

[0010] Furthermore, the lifting mechanism also includes a travel limit seat, an adjustment handle, an adjustment seat, a screw and a limit block. The travel limit seat is fixed to the upper end of the lifting seat, the travel limit seat has a limit groove for the limit block to slide up and down, the frame has a guide hole for the limit block to slide up and down, the adjustment seat is fixed to the back of the frame, the screw is rotatably connected to the adjustment seat, the upper end of the screw is fixedly connected to the adjustment handle, and the lower end of the screw is threadedly connected to the limit block.

[0011] Furthermore, the pressing mechanism also includes a push rod that can pass through the riveting hole of the brake shoe, the push rod is fixed to the lower end of the riveting frame, and the push rod is located directly below the pressing rod.

[0012] Furthermore, a T-slot is provided on the wheel surface of the rotating wheel, and a positioning block is embedded in the T-slot, and the positioning block abuts against the inner side of the brake shoe. Positioning blocks of different sizes can be replaced according to the size and specification of the brake shoe, so that the positioning block is better clamped with the brake shoe.

[0013] Furthermore, a groove is formed on the wheel surface of the rotating wheel, and the clamping cylinder is fixed in the groove, and the angle between the two clamping cylinders is 140° to 170°.

[0014] Furthermore, the travel limit seat includes two Z-shaped pieces, which are fixed to the upper end of the lifting seat and are arranged opposite to each other.

[0015] Furthermore, the limit stopper is cross-shaped, and guide bolts are fixedly connected to both sides of the limit stopper respectively. The guide hole is strip-shaped, and the guide bolts are inserted into the guide hole and slide along the guide hole.

[0016] Working principle: First, place the brake shoe on the rotating wheel, and position it through the positioning block and the positioning column, then start the clamping cylinder to press the clamping block against the surface of the brake shoe to fix the brake shoe to the rotating wheel. Start the rotating motor to drive the rotating wheel to rotate, so that the rotating wheel rotates to the correct position to ensure that the rivet hole on the brake shoe is aligned with the push rod, and the lifting cylinder drives the lifting seat to descend so that the push rod extends into the rivet hole. The rivets in the silo vibrating plate slide down through the feeding slide, and the discharge cylinder pushes the discharge clamp to move, so that a single rivet slides along the feeding and falls into the rivet clamping assembly. The downward pressure cylinder drives the pressure rod to move downward, squeezes the rivet out of the rivet clamping assembly and rivets it to the brake shoe. Since there are two sets of riveting racks, two rivets can be riveted at the same time. After riveting, the pressure rod moves up, and the discharge cylinder continues to discharge. The lifting cylinder pushes the lifting seat upward to make the brake shoe separate from the push rod, and the rotating cylinder rotates the wheel to a certain angle to align the next riveting hole with the push rod, and repeat the riveting action. When the two middle rows of holes on the inner side are all riveted, the translation motor can be started at this time, and the two riveting frames can be moved away from each other through the linkage of the belt and the synchronous block, and the distance between the two push rods is adjusted to the same as the distance between the outer riveting holes, and the riveting action is repeated.

[0017] Compared with the existing technology, this brake shoe riveting machine has the following advantages:

[0018] 1. Fully automatic riveting, with a high degree of automation, can rivet two riveting holes at the same time. The last two rows can be riveted first, and then the two riveting frames can be automatically moved closer or farther away from each other through the translation mechanism, and the other two rows of riveting holes can be riveted after they are in place.

[0019] 2. Only by slightly rotating the rotating shaft can you switch to the next riveting hole to the riveting station, and the lifting cylinder drives the lifting seat up and down to make the brake shoe detach from or sleeve on the top rod, with high riveting accuracy and fast riveting speed.

[0020] 3. The lifting seat is moved up and down by the lifting cylinder. At the same time, the lifting cylinder is responsible for the rebound of the brake shoe, the wheel and the lifting seat after the downward riveting pressure, so that the lifting seat returns to its original position, replacing the rebound of the ordinary spring, and the rebound effect is better.

[0021] 4. Through the positioning mechanism, the positioning column, the clamping block and the positioning block work together to tightly position the brake shoe on the runner. During the riveting process, the brake shoe and the runner are locked, which greatly improves the riveting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front structural schematic diagram of the brake shoe riveting machine.

[0023] Figure 2 It is a schematic diagram of the back structure of the brake shoe riveting machine.

[0024] Figure 3 It is a schematic diagram of the front structure of the riveting device.

[0025] Figure 4 It is a schematic diagram of the back structure of the riveting device.

[0026] Figure 5 It is a structural schematic diagram of a rivet clamping assembly.

[0027] Figure 6 It is a structural schematic diagram of the tooling device.

[0028] Figure 7 It is a structural diagram of the lifting seat.

[0029] In the figure, 1, frame; 2, brake shoe; 3, riveting frame;

[0030] 4. Feeding mechanism; 41. Bin vibration plate; 42. Feeding slide; 43. Discharging cylinder; 44. Discharging fixture;

[0031] 5. Pressing mechanism; 51. Pressing cylinder; 52. Pressing rod; 53. Clamping seat; 54. Left clamping block; 55. Right clamping block; 56. Elastic pressing sheet; 57. Clamping groove; 58. Ejector rod;

[0032] 6. Translation mechanism; 61. Translation motor; 62. Driven wheel; 63. Driving wheel; 64. Belt; 65. Synchronous block; 66. Horizontal slide rail;

[0033] 7. Positioning mechanism; 71. Rotating wheel; 72. Clamping cylinder; 73. Positioning column; 74. Pressing block; 75. Positioning block;

[0034] 8. Rotating mechanism; 81. Lifting seat; 82. Rotating motor; 83. Rotating shaft; 84. Rotating seat;

[0035] 9. Lifting mechanism; 91. Lifting cylinder; 92. Longitudinal guide rail; 93. Travel limit seat; 931. Limit groove; 932. Z-shaped part; 94. Adjustment handle; 95. Adjustment seat; 96. Screw; 97. Limit block; 98. Guide hole; 99. Guide bolt. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] like Figure 1 , Figure 2 As shown, the present brake shoe 2 riveting machine comprises a frame 1, a riveting device for riveting rivets on the brake shoe 2, and a tooling device for fixing the brake shoe 2. The riveting device comprises a riveting frame 3, a feeding mechanism 4, a pressing mechanism 5, and a translation mechanism 6, and the tooling device comprises a positioning mechanism 7, a rotating mechanism 8, and a lifting mechanism 9.

[0038] The feeding mechanism 4 includes a silo vibration plate 41 fixed on the top of the riveting frame 3, a feeding slide 42 embedded in the riveting frame 3, a discharge cylinder 43 and a discharge clamp 44. The upper end of the feeding slide 42 is connected to the discharge port of the silo vibration plate 41. The discharge cylinder 43 is fixed on the riveting frame 3. The push rod of the discharge cylinder 43 is connected to the discharge clamp 44. The discharge clamp 44 is embedded in the feeding slide 42 to prevent the rivet from continuing to slide. When the discharge clamp 44 moves, the rivet can slide down along the feeding slide 42. The discharge clamp 44 has an inclined chute. The discharge cylinder 43 quickly pushes the discharge clamp 44 forward and backward. During this period, a rivet above the feeding slide 42 can be released, so that the rivet continues to slide down.

[0039] The pressing mechanism 5 includes a pressing cylinder 51 fixed on the top of the riveting frame 3, a pressing rod 52, and a rivet clamping assembly. The upper end of the pressing rod 52 is connected to the push rod of the pressing cylinder 51. The rivet clamping assembly includes a clamping seat 53, a left clamping block 54, a right clamping block 55 and an elastic pressing piece 56. The clamping seat 53 is provided with a through hole for the pressing rod 52 to pass through. The left clamping block 54 and the right clamping block 55 are swingably connected to the clamping seat 53. The upper ends of the two elastic pressing pieces 56 are respectively fixed on both sides of the clamping seat 53. The lower ends of the two elastic pressing pieces 56 respectively abut against the outer sides of the left clamping block 54 and the right clamping block 55 and drive the left clamping block 54 and the right clamping block 55 to approach each other. The inner sides of the left clamping block 54 and the right clamping block 55 are provided with clamping grooves 57, and the outlet of the feeding slide 42 is opposite to the clamping grooves 57. The pressing mechanism 5 further comprises a push rod 58 which can pass through the riveting hole of the brake shoe 2, the push rod 58 is fixed to the lower end of the riveting frame 3, and the push rod 58 is located directly below the pressure rod 52. The rivet slides all the way along the feeding slide 42 into the clamping groove 57, the pressure rod 52 descends and extends into the rivet clamping assembly, pushes the rivet in the clamping groove 57, and at the same time pushes the left clamp block 54 and the right clamp block 55 to both sides, so that the rivet falls smoothly into the riveting hole, the pressure rod 52 and the push rod 58 cooperate to rivet the rivet onto the brake shoe 2; the pressure rod 52 rises, and the elastic pressure sheet 56 closes the left clamp block 54 and the right clamp block 55 again.

[0040] The translation mechanism 6 includes a transverse slide rail 66 horizontally fixed on the frame 1, a translation motor 61 fixed on the back of the frame 1, a driven wheel 62 rotatably connected to the frame 1, and a driving wheel 63 fixed on the output shaft of the translation motor 61. The driving wheel 63 and the driven wheel 62 are sleeved with an annular belt 64 for power connection. Synchronous blocks 65 are respectively fixed on the upper and lower sides of the belt 64. The riveting frame 3 has two and both are embedded in the transverse slide rail 66 and slide horizontally along the transverse slide rail 66. The two riveting frames 3 are respectively fixed to one end of their respective synchronous blocks 65.

[0041] The positioning mechanism 7 includes a rotating wheel 71, a clamping cylinder 72 and a positioning column 73 that can be inserted into the positioning hole on the brake shoe 2. The positioning column 73 is fixed on the wheel surface of the rotating wheel 71. The clamping cylinder 72 has two and is fixed on the rotating wheel 71. A clamping block 74 is fixed on the push rod of the clamping cylinder 72, and the clamping block 74 can abut against the surface of the brake shoe 2; the rotating mechanism 8 includes a lifting seat 81, a rotating motor 82 and a rotating shaft 83. The rotating motor 82 is fixed on the lifting seat 81. A rotating seat 84 is vertically fixed on the lifting seat 81. The rotating shaft 83 is penetrated by the rotating seat 84 and is rotatably connected to the rotating seat 84. One end of the rotating shaft 83 is fixed to the output shaft of the rotating motor 82, and the other end of the rotating shaft 83 is fixed to the center hole of the rotating wheel 71.

[0042] The wheel surface of the rotating wheel 71 is provided with a T-shaped groove, and a positioning block 75 is embedded in the T-shaped groove, and the positioning block 75 abuts against the inner side of the brake shoe 2. The positioning blocks 75 of different sizes can be replaced according to the size and specification of the brake shoe 2, so that the positioning block 75 can be better clamped with the brake shoe 2. The wheel surface of the rotating wheel 71 is provided with a groove, and the clamping cylinder 72 is fixed in the groove, and the angle between the two clamping cylinders 72 is 140° to 170°.

[0043] The lifting mechanism 9 includes a lifting cylinder 91 fixed to the bottom of the frame 1, a longitudinal guide rail 92 vertically fixed to the frame 1, and a lifting seat 81 is embedded in the longitudinal guide rail 92 and slides up and down along the longitudinal guide rail 92. The lifting mechanism 9 also includes a travel limit seat 93, an adjustment handle 94, an adjustment clamping seat 95, a screw 96 and a limit stopper 97. The travel limit seat 93 is fixed to the upper end of the lifting seat 81, and the travel limit seat 93 has a limit groove 931 for the limit stopper 97 to slide up and down. The frame 1 is provided with a guide hole 98 for the limit stopper 97 to slide up and down. The adjustment clamping seat 95 is fixed to the back of the frame 1, and the screw 96 is rotatably connected to the adjustment clamping seat 95. The upper end of the screw 96 is fixedly connected to the adjustment handle 94, and the lower end of the screw 96 is threadedly connected to the limit stopper 97.

[0044] The travel limit seat 93 includes two Z-shaped Z-shaped pieces 932, which are fixed to the upper end of the lifting seat 81 and are arranged opposite to each other. The limit stopper 97 is cross-shaped, and guide bolts 99 are fixedly connected to both sides of the limit stopper 97. The guide hole 98 is strip-shaped, and the guide bolt 99 is inserted into the guide hole 98 and slides along the guide hole 98. By turning the adjustment handle 94, the limit stopper 97 is driven up and down by the screw 96, thereby changing the stroke length of the travel limit seat 93. The lifting cylinder 91 pushes the lifting seat 81, and when the lifting seat 81 rises, it stops until the upper edge of the lifting seat 81 abuts against the lower end surface of the limit stopper 97, and when the lifting seat 81 descends, it stops until the Z-shaped piece 932 abuts against the limit stopper 97.

[0045] Working principle: First, place the brake shoe 2 on the rotating wheel 71, and position it through the positioning block 75 and the positioning column 73, then start the clamping cylinder 72 to press the clamping block 74 against the surface of the brake shoe 2, so that the brake shoe 2 is fixed to the rotating wheel 71. Start the rotating motor 82 to drive the rotating wheel 71 to rotate, so that the rotating wheel 71 rotates to the correct position to ensure that the rivet hole on the brake shoe 2 is aligned with the push rod 58, and the lifting cylinder 91 drives the lifting seat 81 to descend, so that the push rod 58 extends into the riveting hole. The rivet in the silo vibration plate 41 slides downward through the feeding slide 42, and the discharge cylinder 43 pushes the discharge clamp 44 to move, so that a single rivet slides along the feeding and falls into the rivet clamping assembly. The pressing cylinder 51 drives the pressing rod 52 to move downward, squeezes the rivet out of the rivet clamping assembly and rivets it to the brake shoe 2. Since there are two sets of riveting frames 3, two rivets can be riveted at the same time. After riveting, the pressure rod 52 moves upward, and the discharge cylinder 43 continues to discharge. The lifting cylinder 91 pushes the lifting seat 81 upward to make the brake shoe 2 separate from the push rod 58, and the rotating cylinder rotates the wheel 71 to a certain angle to align the next riveting hole with the push rod 58, and repeat the riveting action. When the two middle rows of holes on the inner side are all riveted, the translation motor 61 can be started at this time, and the two riveting frames 3 are moved away from each other through the linkage of the belt 64 and the synchronous block 65, and the distance between the two push rods 58 is adjusted to the same as the distance between the outer riveting holes, and then the riveting action is repeated.

[0046] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A brake shoe riveting machine, comprising a frame, a riveting device for riveting rivets to the brake shoe, and a tooling device for fixing the brake shoe, characterized in that: The riveting device includes a riveting frame, a feeding mechanism, a pressing mechanism and a translation mechanism, and the tooling device includes a positioning mechanism, a rotating mechanism and a lifting mechanism; The feeding mechanism comprises a silo vibrating plate fixed on the top of the riveting frame, a feeding slideway embedded in the riveting frame, a discharge cylinder and a discharge clamp, the upper end of the feeding slideway is connected to the discharge port of the silo vibrating plate, the discharge cylinder is fixed on the riveting frame, the push rod of the discharge cylinder is connected to the discharge clamp, the discharge clamp is embedded in the feeding slideway to prevent the rivet from continuing to slide, and the rivet can slide down along the feeding slideway when the discharge clamp moves; The pressing mechanism comprises a pressing cylinder, a pressing rod and a rivet clamping assembly fixed on the top of the riveting frame, the upper end of the pressing rod is connected to the push rod of the pressing cylinder, the rivet clamping assembly comprises a clamping seat, a left clamping block, a right clamping block and an elastic pressing sheet, the clamping seat is provided with a through hole for the pressing rod to pass through, the left clamping block and the right clamping block are swingably connected to the clamping seat, the upper ends of the two elastic pressing sheets are respectively fixed on both sides of the clamping seat, the lower ends of the two elastic pressing sheets are respectively against the outer sides of the left clamping block and the right clamping block and drive the left clamping block and the right clamping block to approach each other, the inner sides of the left clamping block and the right clamping block are provided with clamping grooves, and the outlet of the feeding slideway is opposite to the clamping grooves; the pressing mechanism also comprises a push rod that can pass through the riveting hole of the brake shoe, the push rod is fixed to the lower end of the riveting frame, and the push rod is located directly below the push rod; The translation mechanism includes a transverse slide rail horizontally fixed on the frame, a translation motor fixed on the back of the frame, a driven wheel rotatably connected to the frame, and a driving wheel fixed on the output shaft of the translation motor. The driving wheel and the driven wheel are covered with an annular belt for power connection. Synchronous blocks are respectively fixed on the upper and lower sides of the belt. The riveting frame has two riveting frames, both of which are embedded in the transverse slide rail and slide horizontally along the transverse slide rail. The two riveting frames are respectively fixed to one end of their respective synchronous blocks. The positioning mechanism includes a rotating wheel, a clamping cylinder and a positioning column that can be inserted into the positioning hole on the brake shoe, the positioning column is fixed on the wheel surface of the rotating wheel, the clamping cylinder has two and is fixed on the rotating wheel, and a clamping block is fixed on the push rod of the clamping cylinder, and the clamping block can abut against the surface of the brake shoe; the rotating mechanism includes a lifting seat, a rotating motor and a rotating shaft, the rotating motor is fixed on the lifting seat, a rotating seat is vertically fixed on the lifting seat, the rotating shaft is penetrated on the rotating seat and is rotatably connected to the rotating seat, one end of the rotating shaft is fixed to the output shaft of the rotating motor, and the other end of the rotating shaft is fixed to the center hole of the rotating wheel; the lifting mechanism includes a lifting cylinder fixed to the bottom of the frame, a longitudinal guide rail vertically fixed to the frame, and the lifting seat is embedded in the longitudinal guide rail and slides up and down along the longitudinal guide rail.

2. A brake shoe riveting machine according to claim 1, characterized in that: The lifting mechanism also includes a travel limit seat, an adjustment handle, an adjustment clamping seat, a screw and a limit block. The travel limit seat is fixed to the upper end of the lifting seat, the travel limit seat is provided with a limit groove for the limit block to slide up and down, the frame is provided with a guide hole for the limit block to slide up and down, the adjustment clamping seat is fixed to the back of the frame, the screw is rotatably connected to the adjustment clamping seat, the upper end of the screw is fixedly connected to the adjustment handle, and the lower end of the screw is threadedly connected to the limit block.

3. A brake shoe riveting machine according to claim 1, characterized in that: A T-shaped groove is formed on the wheel surface of the rotating wheel, a positioning block is embedded in the T-shaped groove, and the positioning block abuts against the inner side surface of the brake shoe.

4. A brake shoe riveting machine according to claim 3, characterized in that: The wheel surface of the rotating wheel is provided with a groove, the clamping cylinder is fixed in the groove, and the included angle between the two clamping cylinders is 140° to 170°.

5. A brake shoe riveting machine according to claim 2, characterized in that: The travel limit seat includes two Z-shaped pieces, which are fixed on the upper end of the lifting seat and are arranged opposite to each other.

6. A brake shoe riveting machine according to claim 5, characterized in that: The limit stopper is in a cross shape, and guide bolts are fixedly connected to both sides of the limit stopper respectively. The guide hole is in a strip shape, and the guide bolts are penetrated in the guide hole and slide along the guide hole.

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