Burr prevention mechanism for die casting of automobile shoe block

Abstract

The invention relates to the technical field of die-casting burr treatment, and discloses an automobile shoe block die-casting burr-preventing mechanism which comprises a die-casting machine, a die-casting die is fixedly installed on a workbench of the die-casting machine, and a burr removing assembly is installed at the position, close to the rear side of the die-casting die, of the workbench of the die-casting machine. A moving assembly is installed at the position, close to the outer side of the deburring assembly, of a workbench of the die-casting machine, a discharging sliding way is fixedly arranged on the side, corresponding to the deburring assembly, of the inner side of the die-casting machine, the deburring assembly comprises a fixing frame fixedly installed at the upper end of the workbench of the die-casting machine, and two first sliding rail sleeves are fixedly installed at the upper end of the fixing frame. According to the automobile shoe die-casting burr-preventing mechanism, through overall cooperative use, the edge of a rotating brake shoe can make comprehensive contact with the two sets of polishing wheels for polishing, comprehensive treatment work on the brake shoe is achieved, and burrs are effectively prevented from being left on a produced die-casting brake shoe finished product.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting burr treatment, and particularly relates to an anti-burr mechanism for die-casting automotive brake shoes. Background Art

[0002] Automotive brake shoes are one of the core components of the automotive braking system, mainly used in drum brake systems, and achieve vehicle deceleration or stop through friction with the brake drum. Its structure usually consists of a brake shoe body and a friction plate, and the material and design directly affect braking performance, durability, and safety. Automotive brake shoes are also called brake shoes, brake pads, brake linings, and brake shoe linings. As die-cast parts, burrs are generated during their production process, and the burrs will reduce the molding quality of the products. In addition, relying on workers to manually operate tools such as files and sandpapers is inefficient and difficult to handle. The labor cost increases significantly with the expansion of the production scale, and the quality stability is easily affected by the skill level of the workers. Summary of the Invention

[0003] The main object of the present invention is to provide an anti-burr mechanism for die-casting automotive brake shoes, which can effectively solve the problems in the background art.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: An anti-burr mechanism for die-casting automotive brake shoes includes a die-casting machine. A die-casting mold is fixedly installed on the workbench of the die-casting machine. A deburring component is installed on the workbench of the die-casting machine near the rear side of the die-casting mold. A moving component is installed on the workbench of the die-casting machine near the outer side of the deburring component. A blanking chute is fixedly arranged inside the die-casting machine corresponding to one side of the deburring component. The deburring component includes a fixed frame fixedly installed at the upper end of the workbench of the die-casting machine. Two groups of first slide rail sleeves are fixedly installed at the upper end of the fixed frame. A partition block is fixedly arranged between the two groups of first slide rail sleeves. Activity openings are provided at the middle positions near the inner sides of the two groups of first slide rail sleeves and the fixed frame. First sliders are movably arranged inside the two groups of first slide rail sleeves. A first return spring is fixedly arranged between the first slider and the inner wall of one side of the first slide rail sleeve. Cavities are provided inside the front and rear sides of the first slider. Four groups of first pulleys are rotatably arranged inside the two cavities. A connecting frame is fixedly arranged at the lower end of the first slider. A first motor is fixedly installed at the lower end of the connecting frame. A transmission rod is fixedly arranged at the upper end of the rotating shaft of the first motor. A grinding wheel is fixedly arranged at the upper end of the transmission rod. A shaft seat is rotatably arranged at the middle position of the partition block.

[0005] Preferably, a first synchronous pulley is fixedly arranged at the lower end of the shaft seat, a second synchronous pulley is fixedly arranged at the lower side of the transmission rod, second slide rail sleeves are fixedly installed at positions near the front and rear sides of the lower end of the fixed frame, a second slide block is movably arranged inside the second slide rail sleeve, second pulleys are rotatably arranged on both sides of the second slide block, a second return spring is fixedly arranged between the second slide block and the inner wall of the second slide rail sleeve, a fixed shaft is fixedly arranged at the lower side of the second slide block, a third synchronous pulley is rotatably arranged outside the fixed shaft, and a synchronous belt is sleeved outside the first synchronous pulley, the second synchronous pulley and the two groups of third synchronous pulleys.

[0006] Preferably, the moving assembly includes two groups of electric slide tables fixedly installed at positions near the front and rear sides of the upper end of the die-casting machine workbench close to the deburring assembly, an activity frame is fixedly installed at the upper end of the movable seats of the two groups of electric slide tables, a cylinder is fixedly installed at the upper end of the activity frame close to one side of the die-casting mold, a clamp is fixedly arranged at the lower end of the cylinder telescopic rod, a mounting plate is fixedly installed at one end of the clamp, a bearing is fixedly arranged at the upper end of the mounting plate, and a shoe pressing rod is rotatably arranged inside the rotating shaft of the bearing.

[0007] Preferably, the fixed frame corresponds to the activity openings formed in the first slide rail sleeve, the upper and lower sides of the four groups of first pulleys respectively protrude from the inner side of the cavity to the first slide rail sleeve, and the connecting frame passes through the inside of the activity openings.

[0008] Preferably, the transmission rod passes through the inside of the first slide block and the activity openings, the width and height of one group of the two grinding wheels close to the die-casting mold are both smaller than those of the other group, and the two grinding wheels are correspondingly arranged at the upper and lower stratified positions of the brake shoe.

[0009] Preferably, the second synchronous pulley is arranged on a group of transmission rods in the direction close to the die-casting mold, the two groups of second slide rail sleeves are located between the first synchronous pulley and the second synchronous pulley, and a moving opening is formed in the lower side of the second slide rail sleeve.

[0010] Preferably, the upper and lower sides of the second pulley both protrude from the inside of the second slide block to contact the inner wall of the second slide rail sleeve, and the fixed shaft is movably arranged with the second slide rail sleeve.

[0011] Preferably, the clamp is located inside the die-casting mold corresponding to the die-cast automotive shoe, the shoe pressing rod is fixedly connected with the inner ring of the bearing, and the shoe pressing rod and the shaft seat are arranged on the same straight line.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By using two sets of electric sliding tables, the movable frame, cylinder, and fixture are moved towards the inner side of the die-casting mold. After the fixture is driven by the cylinder to move downward to clamp the brake shoe, the clamped brake shoe is conveyed to the upper end of the shaft seat by the two sets of electric sliding tables. Then, the shoe block pressure rod is moved to the upper end of the brake shoe, and it is clamped and fixed up and down with the shaft seat. In cooperation with the deburring component, the deburring work is carried out. Secondly, after deburring, it is clamped and placed on the discharge chute to be discharged, and the feeding work for the brake shoes to be processed and those that have been processed is automatically carried out, improving the overall processing efficiency. After clamping the brake shoe, by starting two sets of first motors to drive two sets of transmission rods and grinding wheels to rotate. At the same time, the transmission rods will drive the connected second synchronous wheels to rotate, and the synchronous belts respectively drive the first synchronous wheels and the shaft seat to rotate, driving the clamped brake shoe to rotate. During the rotation of the brake shoe, the first slider drives the first pulley to slide in the first slide rail sleeve, squeezing the first return spring. Under the elastic action of the first return spring, the grinding wheel is attached to the edge of the rotating brake shoe, enabling the edge of the rotating brake shoe to fully contact the two grinding wheels for grinding, achieving a comprehensive processing of the brake shoe and effectively preventing burrs from remaining on the finished die-cast brake shoe after production. When the first synchronous wheel is driven to rotate by the synchronous belt, when cooperating with the movement of the transmission rod and the grinding wheel, it will pull two sets of third synchronous wheels, causing the second slider to slide in the second slide rail sleeve, squeezing the second return spring. While cooperating with the movement of the second synchronous wheel, the synchronous belt can be directly sleeved outside the second synchronous wheel, the first synchronous wheel, and the two sets of third synchronous wheels, meeting the requirement that the shaft seat and the brake shoe can continue to rotate when the second synchronous wheel moves to different positions, and the interconnection reduces the use of driving equipment. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention; Figure 2 It is a schematic diagram of a partial structure of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention Figure 1 ; Figure 3 It is a schematic diagram of a partial structure of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention Figure 2 ; Figure 4 It is a schematic diagram of the structure of the deburring component and the moving component of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention; Figure 5 It is a schematic diagram of the structure of the deburring component of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention; Figure 6 It is a schematic diagram of the partial cross-sectional structure of the deburring component of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention Figure 1 ; Figure 7 Partial sectional view structure schematic of the deburring component of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention Figure 2 ; Figure 8 Partial sectional view structure schematic of the deburring component of an anti-burr mechanism for die-casting of automotive shoe blocks according to the present invention Figure 3 。

[0014] In the figure: 1, die-casting machine; 2, die-casting mold; 3, deburring component; 31, fixed frame; 32, first slide rail sleeve; 33, spacer block; 34, movable opening; 35, first slider; 36, first return spring; 37, cavity; 38, first pulley; 39, connecting frame; 310, first motor; 311, transmission rod; 312, grinding wheel; 313, shaft seat; 314, first synchronous pulley; 315, second synchronous pulley; 316, second slide rail sleeve; 317, second slider; 318, second pulley; 319, second return spring; 320, fixed shaft; 321, third synchronous pulley; 322, synchronous belt; 4, moving component; 41, electric slide table; 42, movable frame; 43, cylinder; 44, fixture; 45, mounting plate; 46, bearing; 47, shoe block pressing rod; 5, blanking chute. Specific embodiments

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0016] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is the relative relationship of the orientation or position, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0017] Please refer to Figures 1-8, an embodiment provided by the present invention: an anti-burr mechanism for die-casting automotive shoe blocks, including a die-casting machine 1. A die-casting mold 2 is fixedly installed on the workbench of the die-casting machine 1. A deburring component 3 is installed at a position near the rear side of the die-casting mold 2 on the workbench of the die-casting machine 1. A moving component 4 is installed at a position near the outer side of the deburring component 3 on the workbench of the die-casting machine 1. A blanking chute 5 is fixedly arranged inside the die-casting machine 1 corresponding to one side of the deburring component 3. The deburring component 3 includes a fixed frame 31 fixedly installed at the upper end of the workbench of the die-casting machine 1. Two groups of first slide rail sleeves 32 are fixedly installed at the upper end of the fixed frame 31. A partition block 33 is fixedly arranged between the two groups of first slide rail sleeves 32. Activity openings 34 are provided at positions near the middle inside the two groups of first slide rail sleeves 32 and the fixed frame 31. First sliders 35 are movably arranged inside the two groups of first slide rail sleeves 32. A first return spring 36 is fixedly arranged between the first slider 35 and the inner wall of one side of the first slide rail sleeve 32. Cavities 37 are provided inside the front and rear sides of the first slider 35. Four groups of first pulleys 38 are rotatably arranged inside the two groups of cavities 37. A connecting frame 39 is fixedly arranged at the lower end of the first slider 35. A first motor 310 is fixedly installed at the lower end of the connecting frame 39. A transmission rod 311 is fixedly arranged at the upper end of the rotating shaft of the first motor 310. A grinding wheel 312 is fixedly arranged at the upper end of the transmission rod 311. A shaft seat 313 is rotatably arranged at the middle position of the partition block 33.

[0018] The activity openings 34 provided on the fixed frame 31 and the first slide rail sleeves 32 correspond to each other. The upper and lower sides of the four groups of first pulleys 38 protrude from the inside of the cavity 37 to the first slide rail sleeve 32 respectively. The connecting frame 39 passes through the inside of the activity opening 34. The transmission rod 311 passes through the first slider 35 and the inside of the activity opening 34. The width and height of one of the two groups of grinding wheels 312 that are closer to the die-casting mold 2 are smaller than those of the other group. The two groups of grinding wheels 312 correspond to the upper and lower stratified positions of the brake shoe.

[0019] After clamping the brake shoe, by starting the two groups of first motors 310 to drive the two groups of transmission rods 311 and the grinding wheels 312 to rotate. At the same time, the transmission rod 311 will drive the connected second synchronous wheel 315 to rotate. The first synchronous wheel 314 and the shaft seat 313 are respectively driven to rotate by the synchronous belt 322, driving the clamped brake shoe to rotate. During the rotation of the brake shoe, the first slider 35 drives the first pulley 38 to slide in the first slide rail sleeve 32, squeezing the first return spring 36. Under the elastic action of the first return spring 36, the grinding wheel 312 fits on the edge of the rotating brake shoe, enabling the edge of the rotating brake shoe to fully contact the two groups of grinding wheels 312 for grinding, realizing a comprehensive processing work for the brake shoe, and effectively preventing burrs from remaining on the finished die-cast brake shoe after production.

[0020] A first synchronous pulley 314 is fixedly arranged at the lower end of the shaft seat 313, a second synchronous pulley 315 is fixedly arranged on the lower side of the transmission rod 311, second slide rail sleeves 316 are fixedly installed near the front and rear sides at the lower end of the fixed frame 31, a second slider 317 is movably arranged inside the second slide rail sleeve 316, second pulleys 318 are rotatably arranged on both sides of the second slider 317, a second return spring 319 is fixedly arranged between the second slider 317 and the inner wall of the second slide rail sleeve 316, a fixed shaft 320 is fixedly arranged on the lower side of the second slider 317, a third synchronous pulley 321 is rotatably arranged outside the fixed shaft 320, and a synchronous belt 322 is sleeved outside the first synchronous pulley 314, the second synchronous pulley 315 and the two groups of third synchronous pulleys 321.

[0021] The second synchronous pulley 315 is arranged on a group of transmission rods 311 close to the die-casting mold 2, the two groups of second slide rail sleeves 316 are located between the first synchronous pulley 314 and the second synchronous pulley 315, a moving port is formed in the lower side of the second slide rail sleeve 316, the upper and lower sides of the second pulley 318 protrude from the inside of the second slider 317 and are in contact with the inner wall of the second slide rail sleeve 316, and the fixed shaft 320 is movably arranged with the second slide rail sleeve 316.

[0022] When the first synchronous pulley 314 is driven to rotate by the synchronous belt 322, when cooperating with the movement of the transmission rod 311 and the grinding wheel 312, the two groups of third synchronous pulleys 321 will be pulled, so that the second slider 317 slides in the second slide rail sleeve 316, squeezing the second return spring 319. While cooperating with the movement of the second synchronous pulley 315, the synchronous belt 322 can be directly sleeved outside the second synchronous pulley 315, the first synchronous pulley 314 and the two groups of third synchronous pulleys 321, so as to satisfy that the second synchronous pulley 315 can drive the brake shoe of the shaft seat 313 to rotate continuously at different positions, and the interconnection and linkage can reduce the use of driving equipment.

[0023] The moving assembly 4 includes two electric sliding tables 41 fixedly installed at the upper end of the workbench of the die-casting machine 1 near the front and rear sides of the deburring assembly 3, an activity frame 42 is fixedly installed at the upper end of the movable seats of the two electric sliding tables 41, a cylinder 43 is fixedly installed on the upper end of the activity frame 42 near one side of the die-casting mold 2, a clamp 44 is fixedly arranged at the lower end of the telescopic rod of the cylinder 43, a mounting plate 45 is fixedly installed at one end of the clamp 44, a bearing 46 is fixedly arranged at the upper end of the mounting plate 45, and a shoe pressing rod 47 is rotatably arranged inside the rotating shaft of the bearing 46.

[0024] The clamp 44 is located on the corresponding die-cast automotive shoe inside the die-casting mold 2, the shoe pressing rod 47 is fixedly connected with the inner ring of the bearing 46, and the shoe pressing rod 47 and the shaft seat 313 are arranged on the same straight line.

[0025] By using two sets of electric slides 41, the movable frame 42, the cylinder 43, and the fixture 44 are moved towards the inside of the die-casting mold 2. After the cylinder 43 drives the fixture 44 to move downward to clamp the brake shoe, the clamped brake shoe is conveyed to the upper end of the shaft seat 313 by the two sets of electric slides 41. Then, the shoe block pressure rod 47 is moved to the upper end of the brake shoe, and it is clamped and fixed up and down with the shaft seat 313, and the deburring component 3 is coordinated to perform the deburring work. Secondly, after the deburring, it is clamped and placed on the discharge chute 5, and the feeding work for the brake shoes to be processed and the processed brake shoes is automatically carried out, improving the overall processing efficiency.

[0026] Working principle: During use, by using two sets of electric slides 41, the movable frame 42, the cylinder 43, and the fixture 44 are moved towards the inside of the die-casting mold 2. After the cylinder 43 drives the fixture 44 to move downward to clamp the brake shoe, the clamped brake shoe is conveyed to the upper end of the shaft seat 313 by the two sets of electric slides 41. Then, the shoe block pressure rod 47 is moved to the upper end of the brake shoe, and it is clamped and fixed up and down with the shaft seat 313, and the deburring component 3 is coordinated to perform the deburring work. Secondly, after the deburring, it is clamped and placed on the discharge chute 5, and the feeding work for the brake shoes to be processed and the processed brake shoes is automatically carried out, improving the overall processing efficiency. In addition, after clamping the brake shoe, two sets of first motors 310 are started to drive two sets of transmission rods 311 and grinding wheels 312 to rotate. At the same time, the transmission rod 311 will drive the connected second synchronous wheel 315 to rotate. The first synchronous wheel 314 and the shaft seat 313 are respectively driven by the synchronous belt 322 to rotate, driving the clamped brake shoe to rotate. During the rotation of the brake shoe, the first slider 35 drives the first pulley 38 to slide in the first slide rail sleeve 32, squeezing the first return spring 36. Under the elastic action of the first return spring 36, the grinding wheel 312 is attached to the edge of the rotating brake shoe, so that the edge of the rotating brake shoe can fully contact the two grinding wheels 312 for grinding, realizing the comprehensive processing of the brake shoe and effectively preventing burrs from remaining on the finished die-cast brake shoe after production. In addition, when the synchronous belt 322 drives the first synchronous wheel 314 to rotate, when cooperating with the movement of the transmission rod 311 and the grinding wheel 312, two sets of third synchronous wheels 321 will be pulled, so that the second slider 317 slides in the second slide rail sleeve 316, squeezing the second return spring 319. While cooperating with the movement of the second synchronous wheel 315, the synchronous belt 322 can be directly sleeved outside the second synchronous wheel 315, the first synchronous wheel 314, and the two sets of third synchronous wheels 321, meeting the requirement that the second synchronous wheel 315 can drive the shaft seat 313 and the brake shoe to continuously rotate at different positions, and the interconnection and linkage reduce the use of driving equipment.

[0027] The die-casting machine 1, die-casting mold 2, first motor 310, electric slide table 41, fixture 44, and electrical components in the present invention are existing structures in the art, and the usage and connection methods between other components belong to the common knowledge in this field. Their working principles are already well-known technologies, and the models are selected according to actual use. Therefore, no further detailed explanation will be provided.

[0028] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-burr mechanism for die-casting automotive brake shoes, comprising a die-casting machine (1), characterized in that: A die-casting mold (2) is fixedly installed on the workbench of the die-casting machine (1). A deburring component (3) is installed on the workbench of the die-casting machine (1) near the rear side of the die-casting mold (2). A moving component (4) is installed on the workbench of the die-casting machine (1) near the outer side of the deburring component (3). A blanking chute (5) is fixedly arranged inside the die-casting machine (1) corresponding to one side of the deburring component (3). The deburring component (3) includes a fixed frame (31) fixedly installed at the upper end of the workbench of the die-casting machine (1). Two groups of first slide rail sleeves (32) are fixedly installed at the upper end of the fixed frame (31). A partition block (33) is fixedly arranged between the two groups of first slide rail sleeves (32). Activity openings (34) are formed in the middle positions near the inner sides of the two groups of first slide rail sleeves (32) and the fixed frame (31). First sliders (35) are movably arranged inside the two groups of first slide rail sleeves (32). A first return spring (36) is fixedly arranged between the first slider (35) and the inner wall of one side of the first slide rail sleeve (32). Cavities (37) are formed inside the front and rear sides of the first slider (35). Four groups of first pulleys (38) are rotatably arranged inside the two groups of cavities (37). A connecting frame (39) is fixedly arranged at the lower end of the first slider (35). A first motor (310) is fixedly installed at the lower end of the connecting frame (39). A transmission rod (311) is fixedly arranged at the upper end of the rotating shaft of the first motor (310). A grinding wheel (312) is fixedly arranged at the upper end of the transmission rod (311). A shaft seat (313) is rotatably arranged at the middle position of the partition block (33).

2. The deburring mechanism for die-casting automotive brake shoes according to claim 1, characterized in that: A first synchronous pulley (314) is fixedly arranged at the lower end of the shaft seat (313). A second synchronous pulley (315) is fixedly arranged at the lower side of the transmission rod (311). Second slide rail sleeves (316) are fixedly installed at the lower end of the fixed frame (31) near the front and rear sides. Second sliders (317) are movably arranged inside the second slide rail sleeves (316). Second pulleys (318) are rotatably arranged on both sides of the second slider (317). A second return spring (319) is fixedly arranged between the second slider (317) and the inner wall of the second slide rail sleeve (316). A fixed shaft (320) is fixedly arranged at the lower side of the second slider (317). A third synchronous pulley (321) is rotatably arranged on the outer side of the fixed shaft (320). A synchronous belt (322) is sleeved on the outer sides of the first synchronous pulley (314), the second synchronous pulley (315), and the two groups of third synchronous pulleys (321).

3. A deburring mechanism for die-casting automotive brake shoes according to claim 2, characterized in that: The moving component (4) includes two sets of electric sliding tables (41) fixedly installed at the front and rear sides near the deburring component (3) on the upper end of the workbench of the die-casting machine (1). The upper ends of the movable seats of the two sets of electric sliding tables (41) are fixedly installed with a movable frame (42). One side of the upper end of the movable frame (42) close to the die-casting mold (2) is fixedly installed with a cylinder (43). The lower end of the telescopic rod of the cylinder (43) is fixedly provided with a clamp (44). One end of the clamp (44) is fixedly installed with a mounting plate (45). The upper end of the mounting plate (45) is fixedly provided with a bearing (46). The inner side of the rotating shaft of the bearing (46) is rotatably provided with a shoe pressing rod (47).

4. The deburring mechanism for die-casting of automotive brake shoes according to claim 1, characterized in that: The fixed frame (31) corresponds to the movable opening (34) opened on the first slide rail sleeve (32). The upper and lower sides of the four sets of first pulleys (38) respectively protrude from the inner side of the cavity (37) to the first slide rail sleeve (32), and the connecting frame (39) passes through the inside of the movable opening (34).

5. A deburring mechanism for die-casting automotive brake shoes according to claim 1, characterized in that: The transmission rod (311) passes through the first slider (35) and the inside of the movable opening (34). The width and height of one set of the two grinding wheels (312) close to the die-casting mold (2) are both smaller than those of the other set. The two grinding wheels (312) are correspondingly located at the upper and lower stratified positions of the brake shoe.

6. The deburring mechanism for die-casting automotive brake shoes according to claim 2, characterized in that: The second synchronous wheel (315) is arranged on a set of transmission rods (311) in the direction close to the die-casting mold (2). The two sets of second slide rail sleeves (316) are located between the first synchronous wheel (314) and the second synchronous wheel (315). A moving opening is opened on the lower side of the second slide rail sleeve (316).

7. A deburring mechanism for die-casting automotive shoe blocks according to claim 2, characterized in that: The upper and lower sides of the second pulley (318) both protrude from the inside of the second slider (317) and are in contact with the inner wall of the second slide rail sleeve (316). The fixed shaft (320) is movably arranged with the second slide rail sleeve (316).

8. The anti-burr mechanism for die-casting of automotive brake shoes according to claim 3, wherein: The clamp (44) is located inside the die-casting mold (2) corresponding to the die-cast automotive shoe. The shoe pressing rod (47) is fixedly connected to the inner ring of the bearing (46). The shoe pressing rod (47) and the shaft seat (313) are arranged on the same straight line.

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