A grinding positioning device for brake shoes

Abstract

The present application relates to a grinding and positioning device for a brake shoe, which includes a processing table, a grinding module, a fixture module and a gauge module, wherein the fixture module includes: a support block; a fixed column; a positioning column; a fastening mechanism for pressing the brake shoe onto the support block; a pressing mechanism for pressing the brake shoe onto the fixed column; a locking mechanism for locking the brake shoe onto the positioning column; the gauge module includes: a vertical displacement probe, two of which are provided and mounted on the positioning column; a horizontal displacement probe, which is rotatably mounted on the processing table, and the rotation axis of the horizontal displacement probe coincides with the center of the arc surface of the brake shoe to be processed, and the needle of the horizontal displacement probe is pressed against the arc surface and / or the axial side of the brake shoe to be processed; a first driving mechanism for driving the horizontal displacement probe to rotate; and a general controller configured to output the three-axis positioning displacement difference of the brake shoe to be processed. The present application can accurately detect the three-axis positioning of the brake shoe to be processed to ensure the consistency of grinding processing accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of grinding processing equipment, and in particular to a grinding positioning device for a brake shoe. Background Art

[0002] Drum brakes are commonly used automotive brake components, especially in commercial vehicles. They are actuators that slow down or stop the vehicle. The brake shoe is a major component of the drum brake. It is riveted together with the friction plate to provide support for the friction plate. When the brake is working, the friction plate is pressed against the brake drum to generate friction, thereby achieving the purpose of slowing down or stopping the vehicle. The brake shoe is required to have good strength and rigidity. During the processing of the brake shoe, boring, milling, grinding and other processes need to be carried out in sequence. In the grinding process, the shaft holes and grooves at both ends of the brake shoe need to be ground to the required precision.

[0003] In the related art, a Chinese patent application with publication number CN116442017A proposes a drum brake pad combined grinder, which includes: a frame, a conveying device is provided on the frame, an inner arc grinding device and a trimming device are provided above the conveying device, the inner arc grinding device is provided with an inner arc grinding feeding device, the inner arc grinding feeding device is connected to the inner arc grinding power head, and the trimming device is provided with a trimming feeding device, and the trimming feeding device is connected to the power head. It enables one device to perform both inner arc grinding and trimming, greatly improving the grinding efficiency and grinding progress.

[0004] The above-mentioned related technologies have the following defects: the machining accuracy requirements for the axial holes or axial grooves on the two supporting ends of the brake shoe are extremely high, and the machining error is generally required to be less than 0.05mm. However, for the current machining lathes and homemade fixtures, it is not enough to ensure a high positioning machining accuracy for the workpiece after multiple machining. Therefore, in actual production, the fixture is still self-checked once every 10-20 batches, and the machining accuracy of each workpiece cannot be guaranteed; once the machining accuracy of the axial holes or axial grooves at both ends of the brake shoe deviates, it will cause the flipping angle of the brake shoe when it is braked. Once the machining accuracy of the two brake shoe supporting ends in the brake drum is inconsistent, it will cause abnormal wear of the brake pad on one side, and may even cause a braking accident in severe cases. Summary of the invention

[0005] In order to improve the problem that it is difficult to ensure high-precision consistency in the machining accuracy of the axial holes or axial grooves at both ends of the brake shoe, the present application provides a grinding positioning device for the brake shoe.

[0006] The present application provides a brake shoe grinding and positioning device that adopts the following technical solution:

[0007] A grinding and positioning device for a brake shoe comprises a processing table, wherein a grinding module, a fixture module and a checking fixture module are arranged on the processing table.

[0008] The fixture module comprises:

[0009] A plurality of support blocks are arranged at intervals along the arc-shaped contour of the brake shoe to be processed;

[0010] There are two fixing columns, which are distributed on the outer arc sides of both ends of the brake shoe to be processed;

[0011] A positioning column is arranged at one end of the brake shoe to be processed;

[0012] A fastening mechanism, used to press the axial side of the brake shoe to be processed onto the support block;

[0013] A clamping mechanism, used for pressing the arc surface side of the brake shoe to be processed onto the fixing column; and

[0014] A locking mechanism, used to lock the end of the brake shoe to be processed on the positioning column;

[0015] The inspection tool module comprises:

[0016] Two vertical displacement measuring needles are provided and installed on the positioning column, and the needles of the vertical displacement measuring needles penetrate the positioning column and abut against the end of the brake shoe to be processed;

[0017] A horizontal displacement measuring needle is rotatably mounted on the processing table, and the rotation axis of the horizontal displacement measuring needle coincides with the center of the arc surface of the brake shoe to be processed, and the needle portion of the horizontal displacement measuring needle is tightly pressed against the arc surface and / or axial side surface of the brake shoe to be processed;

[0018] A first driving mechanism, used for driving the horizontal displacement measuring needle to rotate; and

[0019] The main controller is connected to both the vertical displacement measuring needle and the horizontal displacement measuring needle, and is configured to output the three-axis positioning displacement difference of the brake shoe to be processed.

[0020] Furthermore, the needle portion of the horizontal displacement measuring needle comprises a horizontal portion and a vertical portion fixedly connected to each other, the horizontal portion and the vertical portion are arranged orthogonally, and a reinforcing rib is fixedly connected to both of them;

[0021] When the gauge module is working, the needle of the horizontal part abuts against the axial side surface of the brake shoe to be processed, and the needle of the vertical part abuts against the arc surface of the brake shoe to be processed.

[0022] Furthermore, a slide is vertically slidably provided on the positioning column, the two vertical displacement measuring needles are installed on the slide, a slide groove for the slide to slide is provided on the positioning column, and a lifting drive component for driving the slide to rise and fall is provided on the positioning column.

[0023] Furthermore, the horizontal displacement measuring needle is connected to a first controller, and the first controller is controllably connected to the fastening mechanism;

[0024] The first controller is configured to control the clamping mechanism to release and re-clamp the brake shoe to be processed when the horizontal displacement probe detects that the measured axial surface or arc surface of the brake shoe to be processed does not conform to the set position plane, and then allow the horizontal displacement probe to continue detection. After repeating the above control steps several times, the positioning displacement difference of the axial surface and / or arc surface of the brake shoe to be processed is output to the main controller.

[0025] Furthermore, the vertical displacement measuring needle is connected to a second controller, and the second controller is control-connected to the fastening mechanism, the clamping mechanism and the locking mechanism;

[0026] The second controller is configured to control the clamping mechanism and the pressing mechanism to fix the brake shoe to be tested, and then control the locking mechanism to release the lock of the brake shoe to be tested and re-lock it, and then control the clamping mechanism and the pressing mechanism to fix the brake shoe to be tested and allow the vertical displacement probe to continue testing, and after repeating the above control steps several times, output the positioning displacement difference of the end face of the brake shoe to be processed to the main controller.

[0027] Furthermore, the vertical displacement probe and the horizontal displacement probe both include a probe body and a probe seat, the probe body is slidably mounted on the probe seat, a front baffle plate and a rear limit plate arranged along the sliding direction of the probe body are fixedly connected to the probe seat, and the probe body is arranged between the front baffle plate and the rear limit plate;

[0028] The stylus seat is provided with a detection driving member for driving the stylus body to slide. When the stylus body abuts against the front baffle, the stylus body is in a detection state.

[0029] Furthermore, the detection drive component includes a first electromagnet installed on the rear limit plate, and a first magnet is fixedly connected to a side of the probe body close to the rear limit plate; when the first electromagnet is energized, it generates the same magnetism as the first magnet, and the probe body is in a detection state; when the current direction of the first electromagnet is changed, the first electromagnet generates magnetism opposite to that of the first magnet, and the probe body retracts.

[0030] Furthermore, a shielding cover for shielding the first magnet is provided on the probe body.

[0031] Furthermore, a vertically arranged positioning cylinder is fixedly connected to the processing table, a rotating rod is rotatably arranged in the positioning cylinder, one end of the rotating rod extending out of the positioning cylinder is fixedly connected to a shaft rod perpendicular to the rotating rod, and the horizontal displacement measuring needle is installed on the shaft rod;

[0032] The first driving mechanism includes a driving motor, a driving gear fixed to the output end of the driving motor, and a transmission gear fixed to the rotating rod. The driving gear is meshed with the transmission gear, and a notch is provided on the positioning tube for the driving gear to extend into the positioning tube.

[0033] Furthermore, the clamping mechanism includes a plurality of first rotary lifting cylinders vertically arranged on the processing table and a clamping block fixed to the piston rod thereof, the locking mechanism includes a second rotary lifting cylinder horizontally arranged on the processing table and a locking block fixed to the piston rod thereof, and the clamping mechanism includes two linear cylinders corresponding to the two fixed columns and a clamping block fixed to the piston rod thereof.

[0034] In summary, the beneficial technical effects of this application are:

[0035] 1. After the fixture module fixes the brake shoe to be processed, the needles of the horizontal displacement probe and the vertical displacement probe are driven to press against the outer surface of the brake shoe to be processed. By setting two vertical displacement probes, the verticality of the end face of the support end of the brake shoe to be processed can be positioned and detected at one time; and by setting a horizontal part and a vertical part on the needle of the horizontal displacement probe, the lower side surface of the needle of the horizontal part can be pressed against the axial upper side surface of the brake shoe to be processed, so that the z-axis position of the brake shoe to be processed can be positioned and detected; and the head end of the needle of the vertical part can be pressed against the inner arc surface of the brake shoe to be processed. When the first driving mechanism drives the horizontal displacement probe to rotate, the horizontal displacement probe rotates with an axis passing through the center of the arc surface of the brake shoe to be processed, and the vertical part can detect the curvature of the arc surface of the brake shoe to be processed, and at the same time, with the in-position indication of the vertical displacement probe, the position of the processed brake shoe on the x-axis and y-axis can be positioned and detected, thereby achieving the positioning self-check effect of the brake shoe to be processed before grinding, and effectively ensuring the consistency of the grinding accuracy of each batch of brake shoes;

[0036] 2. When the slide table and the two vertical displacement probes on it are driven to rise and fall by the lifting drive, the positioning of the x-axis and y-axis on the three-axis coordinates of the end face can be accurately detected; and when the movement direction of the two vertical displacement probes is inconsistent with the arrangement direction of the two, the positioning of the x-axis, y-axis and z-axis on the three-axis coordinates of the end face can be further comprehensively and accurately detected, and the detection result is highly accurate;

[0037] 3. When the inspection fixture module is started, the first electromagnet is energized to generate a non-contact magnetic repulsion force between the first electromagnet and the first magnet, thereby pushing the probe body to slide on the probe seat until it is fully pressed against the front baffle, so that the probe body enters the detection state; compared with the conventional mechanical brake structure that pushes the probe body out, the non-contact magnetic repulsion in the present application can effectively avoid defects such as inconsistent machining accuracy of parts in the mechanical brake structure, slight deviations in the braking action, and environmental influences on the braking accuracy, and can effectively ensure that each time the brake is applied to push the probe body to the detection station, the probe body can maintain a high consistency in the detection position. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0039] Figure 2 is a top view of the overall structure of an embodiment of the present application;

[0040] Figure 3 is a schematic diagram of the structure of the embodiment of the present application after the grinding module is hidden;

[0041] Figure 4 yes Figure 1 A partial enlarged schematic diagram of part A;

[0042] Figure 5 yes Figure 3 A partial enlarged schematic diagram of part B.

[0043] Description of reference numerals:

[0044] 1. Processing table; 11. Grinding module;

[0045] 21. support block; 22. fixing column; 23. positioning column; 231. slideway; 232. slide table;

[0046] 311, first rotary lifting cylinder; 312, fastening block; 321, linear cylinder; 322, pressing block; 331, second rotary lifting cylinder; 332, locking block;

[0047] 41. Vertical displacement probe; 42. Horizontal displacement probe;

[0048] 5. probe body; 51. horizontal part; 52. vertical part;

[0049] 6. Probe seat; 61. Front baffle; 62. Rear limit plate;

[0050] 71. first electromagnet; 72. first magnet; 73. shielding cover;

[0051] 81, positioning cylinder; 811, notch; 82, rotating rod; 83, shaft rod; 841, driving motor; 842, driving gear; 843, transmission gear;

[0052] 9. Brake shoe. DETAILED DESCRIPTION

[0053] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0054] The present application embodiment discloses a grinding and positioning device for a brake shoe. Figure 1 , Figure 2 and Figure 3 The grinding and positioning device for brake shoes includes a processing table 1, on which a grinding module 11, a fixture module and a gauge module are arranged. The grinding module 11 includes a mechanical arm arranged on the processing table 1 and a grinding head installed on the mechanical arm, wherein the mechanical arm is provided with a tool changing module to automatically replace the corresponding tool head for different shaft holes and shaft grooves to ensure the grinding efficiency. The specific setting is a conventional technical means and will not be repeated here.

[0055] In addition, the fixture module includes:

[0056] The support block 21 is bolted and fixed on the processing table 1, and a plurality of support blocks 21 are arranged at intervals along the arc-shaped contour of the brake shoe 9 to be processed, and the top of the support block 21 is a flat surface;

[0057] Two fixing columns 22 are provided and are distributed on the outer arc sides of both ends of the brake shoe 9 to be processed. They are made of hard metal or hard plastic and their outer surfaces are smooth.

[0058] The positioning column 23 is provided at one end of the brake shoe 9 to be processed, and can be flush with the end surface of the support end of the brake shoe 9 to be processed;

[0059] A clamping mechanism, used to press the axial side of the brake shoe 9 to be processed onto the support block 21;

[0060] A clamping mechanism, used to clamp the arc surface side of the brake shoe 9 to be processed onto the fixing column 22; and

[0061] A locking mechanism, used to lock the end of the brake shoe 9 to be processed on the positioning column 23;

[0062] In addition, see Figure 3 , Figure 4 and Figure 5 , the inspection fixture module includes:

[0063] Two vertical displacement measuring needles 41 are provided and mounted on the positioning column 23. The needles of the vertical displacement measuring needles 41 penetrate the positioning column 23 and abut against the end of the brake shoe 9 to be processed;

[0064] A horizontal displacement measuring needle 42 is rotatably mounted on the machining table 1, and the rotation axis of the horizontal displacement measuring needle 42 coincides with the center of the arc surface of the brake shoe 9 to be machined, and the needle portion of the horizontal displacement measuring needle 42 is tightly pressed against the arc surface and / or axial side surface of the brake shoe 9 to be machined;

[0065] A first driving mechanism, used to drive the horizontal displacement measuring needle 42 to rotate; and

[0066] The main controller is connected to both the vertical displacement measuring needle 41 and the horizontal displacement measuring needle 42, and is configured to output the three-axis positioning displacement difference of the brake shoe 9 to be processed. For ease of understanding, the three axes are set here as the vertical z-axis and the horizontal x-axis and y-axis.

[0067] Furthermore, in this embodiment, in order to improve the accuracy of a single detection, the horizontal displacement probe 42 is selected to detect both the arc surface of the brake shoe 9 to be processed and the axial side surface when rotating; specifically, referring to Figure 3 and Figure 5 The needle portion of the horizontal displacement measuring needle 42 is set as a horizontal portion 51 and a vertical portion 52 that are fixedly connected to each other. The horizontal portion 51 and the vertical portion 52 are set orthogonally, and reinforcing ribs are fixedly connected to the two. When the gauge module is working, the needle head of the horizontal portion 51 abuts against the axial side surface of the brake shoe 9 to be processed, and the needle head of the vertical portion 52 abuts against the arc surface of the brake shoe 9 to be processed.

[0068] After such arrangement, when it is necessary to grind the axial hole and axial groove of the supporting end of the brake shoe 9, the brake shoe 9 to be processed can be placed on the multiple support blocks 21 on the processing table 1, and the outer arc side of the brake shoe 9 to be processed is manually pressed against the two fixed columns 22 and one of the ends is pressed against the positioning column 23, and then the end of the brake shoe 9 to be processed is locked on the positioning column 23 by the locking mechanism, and the arc surface side and axial side of the brake shoe 9 to be processed are fixed on the support block 21 and the fixed column 22 in turn by the clamping mechanism and the fastening mechanism. At this time, the clamping module completes the positioning and fixing of the brake shoe 9 to be processed, which can facilitate the grinding module 11 to perform high-precision processing.

[0069] However, in order to ensure that the brake shoe 9 can maintain a highly uniform processing accuracy after processing during multiple batches, the inspection fixture module can be randomly started before the grinding module 11 is started to conduct random inspections on the three-axis positioning accuracy of the brake shoe 9 to be processed; or the inspection fixture module can be started for self-inspection before each grinding module 11 is started to reduce the processing scrap rate.

[0070] Specifically, after the fixture module fixes the brake shoe 9 to be processed, it can simultaneously drive the needles of the horizontal displacement probe 42 and the vertical displacement probe 41 to press against the outer surface of the brake shoe 9 to be processed, wherein, by setting two vertical displacement probes 41, the verticality of the end surface of the supporting end of the brake shoe 9 to be processed can be positioned and detected at one time, that is, the vertical plane posture of the brake shoe 9 to be processed can be positioned and detected. By arranging a horizontal portion 51 and a vertical portion 52 on the needle portion of the horizontal displacement measuring needle 42, when the needle portion contacts the brake shoe 9 to be processed, the lower side surface of the needle head of the horizontal portion 51 abuts against the axial upper side surface of the brake shoe 9 to be processed, so that the vertical height of the brake shoe 9 to be processed can be positioned and detected, that is, the z-axis position of the brake shoe 9 to be processed can be positioned and detected; and the needle head end of the vertical portion 52 abuts against the inner arc surface of the brake shoe 9 to be processed. When the first driving mechanism drives the horizontal displacement measuring needle 42 to rotate, the horizontal displacement measuring needle 42 rotates about the axis passing through the center of the arc surface of the brake shoe 9 to be processed, and the vertical portion 52 can detect the curvature of the arc surface of the brake shoe 9 to be processed, and at the same time, in conjunction with the in-position indication of the vertical displacement measuring needle 41, it can also position and detect the position of the processed brake shoe 9 on the x-axis and y-axis, thereby achieving a positioning self-check effect of the brake shoe 9 to be processed before grinding, and can effectively ensure the consistency of the grinding accuracy of each batch of brake shoes 9.

[0071] To this end, the inspection fixture module needs to ensure the accuracy of self-inspection while also speeding up the operation rhythm to reduce the impact on normal processing.

[0072] Therefore, on the one hand, in the embodiments of the present application, reference is made to Figure 1 and Figure 4 A slide 232 is provided on the positioning column 23 for vertical sliding. Two vertical displacement probes 41 are installed on the slide 232. The vertical displacement probes 41 are arranged horizontally, and the two vertical displacement probes 41 are arranged in the vertical direction. A slide groove 231 for the slide 232 to slide is provided on the positioning column 23. A lifting drive member for driving the slide 232 to move up and down is provided on the positioning column 23. The lifting drive member can be a linear drive member such as a cylinder, an electric cylinder, and a linear motor. Moreover, when the lifting drive member drives the slide 232 to move up and down, the slide 232 can be driven to move up and down vertically, or it can be slightly tilted and moved up and down at a certain inclination angle on the contact surface of the positioning column 23, so that the two vertical displacement probes 41 do not exceed the end surface of the support end of the brake shoe 9 to be processed during the movement.

[0073] In this way, when the slide 232 and the two vertical displacement probes 41 thereon are driven to rise and fall by the lifting drive component, the positioning of the x-axis and the y-axis on the three-axis coordinates of the end face can be accurately detected; and when the movement direction of the two vertical displacement probes 41 is controlled to be inconsistent with the arrangement direction of the two, the positioning of the x-axis, y-axis and z-axis on the three-axis coordinates of the end face can be further comprehensively and accurately detected, and the detection result has a high accuracy.

[0074] On the other hand, refer to Figure 4 and Figure 5 The vertical displacement probe 41 and the horizontal displacement probe 42 both include a probe body 5 and a probe seat 6. The probe body 5 is slidably mounted on the probe seat 6. A front baffle plate 61 and a rear limit plate 62 arranged along the sliding direction of the probe body 5 are fixedly connected to the probe seat 6. The probe body 5 is arranged between the front baffle plate 61 and the rear limit plate 62. The probe seat 6 is provided with a detection drive member for driving the probe body 5 to slide. When the probe body 5 is against the front baffle plate 61, the probe body 5 is in a detection state.

[0075] Specifically, the detection drive member includes a first electromagnet 71 mounted on the rear limit plate 62, and a first magnet 72 is fixedly connected to one side of the probe body 5 close to the rear limit plate 62; when the first electromagnet 71 is energized, it generates the same magnetism as the first magnet 72, and the probe body 5 is in a detection state; when the current direction of the first electromagnet 71 is changed, the first electromagnet 71 generates magnetism opposite to the first magnet 72, and the probe body 5 retreats. A shielding cover 73 for shielding the first magnet 72 is provided on the probe body 5 to reduce the influence of the magnetic field of the first magnet 72 on the detection accuracy of the probe body 5.

[0076] In this way, when the inspection fixture module is started, the first electromagnet 71 is energized, and magnetism that repels the first magnet 72 is generated on the first electromagnet 71, so that a non-contact magnetic repulsion force is generated between the first electromagnet 71 and the first magnet 72, thereby pushing the probe body 5 to slide on the probe holder 6 until it is fully in contact with the front baffle 61, so that the probe body 5 enters the detection state; compared with the conventional mechanical braking structure that pushes the probe body 5 out, the non-contact magnetic repulsion force in the present application can effectively avoid the defects of inconsistent machining accuracy of parts in the mechanical braking structure, slight deviations in the braking action, and braking accuracy being affected by the environment, and can effectively ensure that each time the brake is applied to push the probe body 5 to the detection station, the probe body 5 can maintain a high consistency in the detection position.

[0077] When the inspection of the inspection fixture module is completed, a current in the opposite direction is passed through the first electromagnet 71, so that the first electromagnet 71 generates magnetism opposite to that of the first magnet 72. The first electromagnet 71 attracts the first magnet 72 to make the probe body 5 retreat, which can effectively prevent the next batch of brake shoes 9 to be processed from causing damage to the needle part of the probe body 5 during installation and affecting the inspection accuracy of the inspection fixture module.

[0078] Furthermore, in other feasible embodiments, the front baffle 61 can be bolted and fixed on the probe holder 6, and the position of the front baffle 61 on the probe holder 6 can be adjusted, so that when grinding brake shoes 9 of different sizes, the detection position of the probe body 5 can be adjusted for detection adaptation.

[0079] In addition, the horizontal displacement probe 42 is connected to a first controller, and the first controller is connected to the clamping mechanism control; the first controller is configured to control the clamping mechanism to release the clamping of the brake shoe 9 to be processed and re-clamp it when the horizontal displacement probe 42 detects that the measured axial surface or arc surface of the brake shoe 9 to be processed does not conform to the set position plane, and then the horizontal displacement probe 42 continues to detect. After repeating the above control steps several times, the clamping mechanism can automatically repeat the clamping of the brake shoe 9 to be processed to reduce the influence of artificial unstable placement; and if the detection result of the horizontal displacement probe 42 still shows that it does not meet the standard after the clamping mechanism has been automatically repaired for many times, the positioning displacement difference of the axial surface and / or arc surface of the brake shoe 9 to be processed is output to the main controller.

[0080] The vertical displacement measuring needle 41 is connected to a second controller, and the second controller is controlled and connected with the clamping mechanism, the clamping mechanism and the locking mechanism; the second controller is configured to control the clamping mechanism and the clamping mechanism to fix the brake shoe 9 to be tested, and then control the locking mechanism to release the lock of the brake shoe 9 to be processed and re-lock it, and then control the clamping mechanism and the clamping mechanism to fix the brake shoe 9 to be tested and allow the vertical displacement measuring needle 41 to continue testing. After repeating the above control steps several times, the clamping mechanism, the clamping mechanism and the locking mechanism are also automatically repaired for multiple times on the brake shoe 9 to be processed to reduce the impact of artificial unstable placement; and if the detection result of the horizontal displacement measuring needle 42 still shows that it does not meet the standard after multiple automatic repairs, the detection result of the displacement measuring needle still shows that it does not meet the standard, and then the positioning displacement difference of the end face of the brake shoe 9 to be processed is output to the main controller.

[0081] Therefore, with the help of the settings of the first controller and the second controller, after the inspection fixture module performs the first inspection on the brake shoe 9 to be processed and finds that it does not meet the standards, the placement form of the brake shoe 9 to be processed can be automatically repaired to reduce the impact of artificial unstable placement. If it is still unqualified after multiple repairs and re-self-inspection, the three-axis positioning displacement difference of the brake shoe 9 to be processed is output to the main controller, which can reduce the interference of human factors in the grinding positioning device of the present application, and also reduce the dependence on manual operation, so that it can basically run automatically.

[0082] Furthermore, in order to ensure the stable rotation of the horizontal displacement probe 42 on the processing table 1, refer to Figure 1 , Figure 2 and Figure 3 A vertically arranged positioning cylinder 81 is fixedly connected to the processing table 1, a rotating rod 82 is rotatably arranged in the positioning cylinder 81, and an end of the rotating rod 82 extending out of the positioning cylinder 81 is fixedly connected to a shaft rod 83 perpendicular to the rotating rod 82, and the horizontal displacement measuring needle 42 is installed on the shaft rod 83; and a rib is fixedly connected between the shaft rod 83 and the rotating rod 82, wherein the shaft rod 83 can be a square tube, a round tube or a C-shaped groove rod, etc., which has a strong anti-bending performance.

[0083] The first driving mechanism includes a driving motor 841, a driving gear 842 fixed to the output end of the driving motor 841, and a transmission gear 843 fixed to the rotating rod 82. The driving gear 842 is meshed with the transmission gear 843. The positioning cylinder 81 is provided with a notch 811 for the driving gear 842 to extend into the positioning cylinder 81. The driving motor 841 is fixed to the outer wall of the positioning cylinder 81. In other feasible embodiments, the positioning cylinder 81 can be further bolted and fixed to the processing table 1, so that the position of the positioning cylinder 81 on the processing table 1 is adjustable, so that the present application can be applied to the grinding of brake shoes 9 with different curvatures.

[0084] In this way, when the driving motor 841 drives the driving gear 842 thereon to rotate, it can drive the transmission gear 843 and the rotating rod 82 to rotate in the positioning cylinder 81, and then the shaft 83 on the rotating rod 82 and the corresponding horizontal displacement measuring needle 42 can be swung. By controlling the angle and rotation direction of the driving gear 842 driven by the driving motor 841, the needle part of the horizontal displacement measuring needle 42 can be made to slide back and forth on the arc surface of the brake shoe 9 to be processed, thereby providing a stable detection effect.

[0085] In addition, refer to Figure 1 , Figure 2 and Figure 3The clamping mechanism includes a plurality of first rotary lifting cylinders 311 vertically arranged on the processing table 1 and a clamping block 312 fixedly connected to its piston rod, and the piston rod drives the clamping block 312 to approach and press the brake shoe 9 to be processed and move away from the area where the brake shoe 9 to be processed is located when rotating and telescoping; the locking mechanism includes a second rotary lifting cylinder 331 horizontally arranged on the processing table 1 and a locking block 332 fixedly connected to its piston rod, and the piston rod drives the locking block 332 to approach and lock the brake shoe 9 to be processed and move away from the supporting end of the brake shoe 9 to be processed when rotating and telescoping; the clamping mechanism includes two linear cylinders 321 corresponding to the two fixed columns 22 and a clamping block 322 fixedly connected to its piston rod, and the piston rod drives the clamping block 322 to press the brake shoe 9 to be processed and move away from the brake shoe 9 to be processed when telescoping.

[0086] The implementation principle of the grinding and positioning device for brake shoes in the embodiment of the present application is:

[0087] When it is necessary to grind the axial hole and axial groove of the supporting end of the brake shoe 9, the brake shoe 9 to be processed can be placed on a plurality of support blocks 21 on the processing table 1, and the outer arc side of the brake shoe 9 to be processed can be manually pressed against the two fixing columns 22 and one of the ends can be pressed against the positioning column 23. Then, the end of the brake shoe 9 to be processed can be locked on the positioning column 23 through the locking mechanism, and the arc surface side and axial side of the brake shoe 9 to be processed can be fixed on the support block 21 and the fixing column 22 respectively through the clamping mechanism and the fastening mechanism. At this time, the fixture module completes the positioning and fixing of the brake shoe 9 to be processed, which can facilitate the grinding module 11 to perform high-precision processing.

[0088] After the fixture module fixes the brake shoe 9 to be processed, it can simultaneously drive the needles of the horizontal displacement probe 42 and the vertical displacement probe 41 to press against the outer surface of the brake shoe 9 to be processed, wherein, by setting two vertical displacement probes 41, the verticality of the end surface of the supporting end of the brake shoe 9 to be processed can be positioned and detected at one time, that is, the vertical plane posture of the brake shoe 9 to be processed can be positioned and detected. By arranging a horizontal portion 51 and a vertical portion 52 on the needle portion of the horizontal displacement measuring needle 42, when the needle portion contacts the brake shoe 9 to be processed, the lower side surface of the needle head of the horizontal portion 51 abuts against the axial upper side surface of the brake shoe 9 to be processed, so that the vertical height of the brake shoe 9 to be processed can be positioned and detected, that is, the z-axis position of the brake shoe 9 to be processed can be positioned and detected; and the needle head end of the vertical portion 52 abuts against the inner arc surface of the brake shoe 9 to be processed. When the first driving mechanism drives the horizontal displacement measuring needle 42 to rotate, the horizontal displacement measuring needle 42 rotates about the axis passing through the center of the arc surface of the brake shoe 9 to be processed, and the vertical portion 52 can detect the curvature of the arc surface of the brake shoe 9 to be processed, and at the same time, in conjunction with the in-position indication of the vertical displacement measuring needle 41, it can also position and detect the position of the processed brake shoe 9 on the x-axis and y-axis, thereby achieving a positioning self-check effect of the brake shoe 9 to be processed before grinding, and can effectively ensure the consistency of the grinding accuracy of each batch of brake shoes 9.

[0089] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0090] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A grinding and positioning device for a brake shoe, comprising a processing table (1), wherein the processing table (1) is provided with a grinding module (11), a fixture module and a gauge module, wherein: The fixture module comprises: A plurality of support blocks (21) are arranged at intervals along the arc-shaped contour of the brake shoe (9) to be processed; Two fixing columns (22) are provided and are distributed on the outer arc sides of both ends of the brake shoe (9) to be processed; A positioning column (23) is arranged at one end of the brake shoe (9) to be processed; A clamping mechanism, used for pressing the axial side of the brake shoe (9) to be processed onto the support block (21); A clamping mechanism, used for pressing the arc surface side of the brake shoe (9) to be processed onto the fixing column (22); and A locking mechanism, used for locking the end of the brake shoe (9) to be processed on the positioning column (23); The inspection tool module comprises: Two vertical displacement measuring needles (41) are provided and mounted on the positioning column (23), wherein the needle portion of the vertical displacement measuring needle (41) penetrates the positioning column (23) and abuts against the end of the brake shoe (9) to be processed; A horizontal displacement measuring needle (42) is rotatably mounted on the processing table (1), and the rotation axis of the horizontal displacement measuring needle (42) coincides with the center of the arc surface of the brake shoe (9) to be processed, and the needle portion of the horizontal displacement measuring needle (42) is tightly pressed against the arc surface and / or axial side surface of the brake shoe (9) to be processed; A first driving mechanism, used for driving the horizontal displacement measuring needle (42) to rotate; and A main controller connected to both the vertical displacement measuring needle (41) and the horizontal displacement measuring needle (42), and configured to output a three-axis positioning displacement difference of the brake shoe (9) to be processed; The needle portion of the horizontal displacement measuring needle (42) comprises a horizontal portion (51) and a vertical portion (52) which are fixedly connected to each other, the horizontal portion (51) and the vertical portion (52) being arranged orthogonally, and reinforcing ribs are fixedly connected to both. When the inspection tool module is in operation, the needle of the horizontal portion (51) contacts the axial side surface of the brake shoe (9) to be processed, and the needle of the vertical portion (52) contacts the arc surface of the brake shoe (9) to be processed; A slide table (232) is vertically slidably provided on the positioning column (23), the two vertical displacement measuring needles (41) are both mounted on the slide table (232), a slide groove (231) for the slide table (232) to slide is provided on the positioning column (23), and a lifting drive member for driving the slide table (232) to move up and down is provided on the positioning column (23); The horizontal displacement measuring needle (42) is connected to a first controller, and the first controller is controllably connected to the fastening mechanism; The first controller is configured to control the clamping mechanism to release the clamping of the brake shoe (9) to be processed and then re-clamp it when the horizontal displacement probe (42) detects that the measured axial surface or arc surface of the brake shoe (9) to be processed does not conform to the set position plane, and then allow the horizontal displacement probe (42) to continue detection, and after repeating the control steps several times, output the positioning displacement difference of the axial surface and / or arc surface of the brake shoe (9) to be processed to the main controller; The vertical displacement measuring needle (41) is connected to a second controller, and the second controller is controllably connected to the fastening mechanism, the pressing mechanism and the locking mechanism; The second controller is configured to control the clamping mechanism and the pressing mechanism to fix the brake shoe (9) to be processed, and then control the locking mechanism to release the locking of the brake shoe (9) to be processed and re-lock it, and then control the clamping mechanism and the pressing mechanism to fix the brake shoe (9) to be processed and allow the vertical displacement probe (41) to continue detection, and after repeating the control steps several times, output the positioning displacement difference of the end face of the brake shoe (9) to be processed to the main controller.

2. The brake shoe grinding and positioning device according to claim 1, characterized in that: The vertical displacement measuring needle (41) and the horizontal displacement measuring needle (42) both comprise a measuring needle body (5) and a measuring needle seat (6); the measuring needle body (5) is slidably mounted on the measuring needle seat (6); a front baffle plate (61) and a rear limit plate (62) arranged along the sliding direction of the measuring needle body (5) are fixedly connected to the measuring needle seat (6); the measuring needle body (5) is arranged between the front baffle plate (61) and the rear limit plate (62); The stylus base (6) is provided with a detection drive member for driving the stylus body (5) to slide; when the stylus body (5) abuts against the front baffle (61), the stylus body (5) is in a detection state.

3. The brake shoe grinding and positioning device according to claim 2, characterized in that: The detection drive component comprises a first electromagnet (71) mounted on the rear limit plate (62), and a first magnet (72) is fixedly connected to a side of the probe body (5) close to the rear limit plate (62); when the first electromagnet (71) is energized, it generates the same magnetism as the first magnet (72), and the probe body (5) is in a detection state; when the current direction of the first electromagnet (71) is changed, the first electromagnet (71) generates the opposite magnetism to the first magnet (72), and the probe body (5) retreats.

4. The brake shoe grinding and positioning device according to claim 3, characterized in that: The measuring needle body (5) is provided with a shielding cover (73) for shielding the first magnet (72).

5. The brake shoe grinding and positioning device according to claim 1, characterized in that: A vertically arranged positioning cylinder (81) is fixedly connected to the processing table (1), a rotating rod (82) is rotatably arranged in the positioning cylinder (81), an end of the rotating rod (82) extending out of the positioning cylinder (81) is fixedly connected to a shaft (83) perpendicular to the rotating rod (82), and the horizontal displacement measuring needle (42) is mounted on the shaft (83); The first driving mechanism comprises a driving motor (841), a driving gear (842) fixedly connected to an output end of the driving motor (841), and a transmission gear (843) fixedly connected to the rotating rod (82); the driving gear (842) is meshingly connected with the transmission gear (843); and a notch (811) is provided on the positioning tube (81) for the driving gear (842) to extend into the positioning tube (81).

6. The brake shoe grinding and positioning device according to claim 1, characterized in that: The fastening mechanism comprises a plurality of first rotary lifting cylinders (311) vertically arranged on the processing table (1) and a fastening block (312) fixedly connected to the piston rod of the first rotary lifting cylinder (311); the locking mechanism comprises a second rotary lifting cylinder (331) horizontally arranged on the processing table (1) and a locking block (332) fixedly connected to the piston rod of the second rotary lifting cylinder (331); and the pressing mechanism comprises two linear cylinders (321) corresponding to the two fixed columns (22) and a pressing block (322) fixedly connected to the piston rod thereof.

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