An automated brake drum balance detection device

Abstract

The present invention discloses an automated brake drum dynamic balance detection device, which belongs to the technical field of dynamic balance detection. Through the provided pushing mechanism and locking mechanism, when the thickness of the inner wall of the brake drum body changes due to deformation, some clamps cannot abut against the inner wall of the brake drum body when moving the same distance. After the electric control push rod is extended, it can drive the slide to move through the threaded sleeve until the slide drives the clamp to abut against the inner wall of the brake drum body after deformation. When the clamp can move a second time, it can be determined that the thickness of the inner wall of the brake drum body has changed due to deformation, and dynamic balance cannot be achieved simply by adding a balance block, thereby avoiding the safety hazards caused by misjudgment of defects.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic balance detection, and in particular to an automatic brake drum dynamic balance detection device. Background Art

[0002] The brake drum is the friction component of a drum brake. It is usually cylindrical in shape and is fixed to the tire and rotates at the same speed as the tire. When braking is required, the oil pressure pushes the brake shoe into contact with the inner edge of the brake drum. The friction generated by the contact inhibits the rotation of the tire, thereby achieving the braking purpose.

[0003] To ensure the dynamic balance of the brake drum, the wheels and brake system should be inspected and maintained regularly to detect and resolve potential problems in a timely manner. The dynamic balance test of the brake drum requires the use of a dedicated instrument for measuring dynamic balance. The instrument uses sensors and data processing systems to detect the vibration and imbalance of the brake drum during rotation, thereby helping technicians determine whether adjustments are needed.

[0004] In actual operation, if the thickness of the inner and outer walls of the brake drum are significantly deformed, this deformation will also cause imbalance during rotation, which will be detected by the passive balancing tester. Since it does not have the function of detecting changes in the thickness of the inner and outer walls, in this case, the dynamic balancing tester will display the result of imbalance, which may easily cause technicians to make incorrect judgments on the defects of the brake drum.

[0005] Workers may achieve dynamic balance by adding balancing blocks at a position symmetrical to the unstable point. Since the addition of balancing blocks will change the mass distribution of the brake drum, thereby generating additional torque, after this torque offsets or reduces the original unbalanced torque caused by uneven mass distribution, it is easy to pass the dynamic balance test during the secondary inspection, resulting in the problem of change in brake drum wall thickness being ignored, leaving a safety hazard. Summary of the Invention

[0006] The purpose of the present invention is to propose an automated brake drum dynamic balance detection device in order to solve the problem that existing dynamic balance detection equipment does not have the function of detecting changes in inner and outer wall thickness, which easily leads to technicians making incorrect judgments on brake drum defects.

[0007] In order to achieve the above objectives, the present invention adopts the following technologies: an automated brake drum balance detection device:

[0008] It includes a power source, a placement frame mounted on the power source, and a brake drum body. The placement frame is provided with a rotating mechanism connected to the output end of the power source. The rotating mechanism includes a rotating disk driven to rotate by the power source, and a clamping mechanism is installed on the rotating disk.

[0009] The clamping mechanism comprises a housing mounted on a rotating disk, a clamp is provided on the housing and a movable rod that can be raised and lowered is provided at the bottom of the clamp;

[0010] A plurality of positioning plates are provided in the middle of the housings, and a positioning groove for the movable rod to be inserted is provided on the surface of the positioning plates. When the rotating plates rotate, the clamp moves horizontally along the center line until it fits into the inner wall of the brake drum body;

[0011] After the movable rod is moved out of the positioning slot by lifting, the clamp can also be moved by a pushing mechanism. The pushing mechanism includes an electrically controlled push rod installed in the shell. The electrically controlled push rod pushes the clamp to continue moving to fit the deformed position of the brake drum body.

[0012] As a further description of the above technology, an automated brake drum balance detection device:

[0013] The rotating mechanism also includes a rotating chamber mounted on the placement frame, the rotating disk is rotatably arranged inside the rotating chamber, a mounting shaft penetrating the middle of the rotating disk is installed in the middle of the rotating chamber, and the positioning disk is fixedly mounted on the mounting shaft;

[0014] A transmission rod is installed at the output end of the power source, and the transmission rod and the rotating disk are engaged with each other. When the power source rotates, the transmission rod drives the rotating disk to rotate with the installation shaft as the axis.

[0015] As a further description of the above technology, an automated brake drum balance detection device:

[0016] The housing further comprises a slide rail mounted in the accommodating cavity and a slide table slidably embedded on the slide rail, wherein a straight groove is provided in the middle of the slide rail for the positioning rod to move;

[0017] The clamp and the positioning rod are respectively installed on the top and bottom of the slide, and the movable rod is movably sleeved on the surface of the positioning rod and is lifted and lowered by an adjusting mechanism.

[0018] As a further description of the above technology, an automated brake drum balance detection device:

[0019] The adjusting mechanism includes a rotating shaft rotatably mounted on the positioning rod and a limiting shaft mounted on the movable rod, an eccentric wheel is mounted on the rotating shaft and a connecting rod is sleeved on the limiting shaft, the connecting rod and the eccentric wheel are rotatably connected through a hinge shaft, and when the eccentric wheel rotates, the connecting rod is pushed and pulled to drive the movable rod to rise and fall.

[0020] As a further description of the above technology, an automated brake drum balance detection device:

[0021] The pushing mechanism further includes a mounting seat provided at the end of the accommodating cavity, wherein an outer surface of the mounting seat is configured to be arc-shaped and has the same curvature as the outer wall of the housing;

[0022] A threaded sleeve rod is installed on the mounting seat, and a thread engaged with the threaded sleeve rod is provided in the middle of the slide.

[0023] As a further description of the above technology, an automated brake drum balance detection device:

[0024] A measuring piece that penetrates the mounting seat is installed at the end of the output end of the electric control push rod, and a scale is engraved on the surface of the measuring piece.

[0025] As a further description of the above technology, an automated brake drum balance detection device:

[0026] A locking mechanism that engages with the threaded sleeve is provided inside the slide, and the locking mechanism includes a rotating groove opened in the middle of the slide, a collar is rotatably provided in the rotating groove, and the collar includes an internal threaded ring with a thread that engages with the threaded sleeve on the inner wall, and the internal threaded ring is rotatably embedded in the rotating groove through an engaging ring provided on the outer edge.

[0027] As a further description of the above technology, an automated brake drum balance detection device:

[0028] The positioning rod has an inner cavity, and a pusher is rotatably provided in the middle of the inner cavity. A contact-avoiding cavity is provided at the junction of the positioning rod and the rotating groove, and a lifting rod is provided through the middle.

[0029] The upper and lower ends of the lifting rod are respectively provided with a limiting rack meshing with the teeth and an abutting piece abutting with the pushing piece.

[0030] As a further description of the above technology, an automated brake drum balance detection device:

[0031] A through hole is provided in the middle of the pushing member, and a rotating shaft is provided through the middle of the through hole;

[0032] When the rotating shaft rotates and pulls the movable rod to lift up to release the connection with the positioning plate, the pushing member rotates with the rotating shaft and pushes the abutment member to rise. The abutment member pushes the limiting rack to rise through the lifting rod. After the limiting rack reaches the highest point, it engages with the teeth.

[0033] As a further description of the above technology, an automated brake drum balance detection device:

[0034] A driving motor is also installed on the positioning rod, and the end of the rotating shaft close to the driving motor is connected to the output end of the driving motor.

[0035] In summary, due to the use of the above-mentioned technology in an automated brake drum balance detection device, the beneficial effects of the present invention are:

[0036] 1. Through the provided rotating mechanism and clamping mechanism, when the brake drum body needs to be inspected, the brake drum body is placed on a circular table composed of multiple shells with the installation axis as the center, and the preferred number of shells is , and at this time the power source is started again, so that the power source drives the transmission rod to rotate and transmits the torque to the rotating disk, so that the rotating disk can drive the shell to rotate under the limitation of the rotating cavity; because the positioning disk is fixed and the movable rod is inserted into the positioning groove at this time, the shell will contact the positioning groove during the rotation process and move under the push of the inner wall of the positioning groove, and the movable rod drives the slide to move under the guidance of the slide rail through the positioning rod, and the slide can drive the clamp to move and fit on the inner wall of the brake drum body. When the wall thickness of the brake drum body does not change due to deformation, the multiple clamps are tightly fitted with the inner wall of the brake drum body until the clamp cannot move, the rotating disk and the shell cannot continue to rotate, the brake drum body is fixed, and the power source temporarily stops;

[0037] 2. Through the setting adjustment mechanism, the restriction of the positioning disk on the rotation of the rotating disk is released through the adjustment mechanism. As shown in the figure and the figure, the adjustment mechanism includes a rotating shaft rotatably installed on the positioning rod and a limiting shaft installed on the movable rod. An eccentric wheel is installed on the rotating shaft and a connecting rod is sleeved on the limiting shaft. The connecting rod and the eccentric wheel are rotatably connected through a hinge shaft. When the eccentric wheel rotates, the connecting rod is pushed and pulled to drive the movable rod to rise and fall; by rotating the rotating shaft, the rotating shaft drives the hinge shaft to rotate with the rotating shaft as the axis through the eccentric wheel. During the rotation process, the hinge shaft pushes and pulls the rotating shaft through the connecting rod, so that the rotating shaft can drive the movable rod to rise and fall on the surface of the positioning rod. After the movable rod is moved out of the positioning groove, the contact is restricted, and the positioning disk no longer restricts the rotation of the rotating disk. At this time, the power source is started again to perform the dynamic balancing test.

[0038] 3. Through the provided pushing mechanism and locking mechanism, when the thickness of the inner wall of the brake drum body changes due to deformation, some clamps cannot abut against the inner wall of the brake drum body when moving the same distance. At this time, the movable rod needs to be moved out of the positioning groove; the pushing member abuts the abutment member by rotating and pushes the lifting rod to rise, and the limit rack is ejected from it and contacts and meshes with the teeth. At this time, under the restriction of the limit rack and the teeth, the internal threaded ring cannot rotate in the rotation groove. At this time, the electric control push rod is started to extend the output end of the electric control push rod. Since the threaded sleeve is engaged with the internal threaded ring and the internal threaded ring cannot rotate, the threaded sleeve and the internal threaded ring are in a mutually locked state at this time. After the electric control push rod is extended, it can drive the slide to move through the threaded sleeve until the slide drives the clamp to abut against the deformed inner wall of the brake drum body. When the clamp can move a second time, it can be judged that the thickness of the inner wall of the brake drum body has changed due to deformation. Dynamic balance cannot be achieved simply by adding a balancing block, thereby avoiding the safety hazards caused by misjudgment of defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the three-dimensional structure of an automated brake drum balance detection device is shown;

[0040] Figure 2 shows a schematic diagram of a top cross-sectional structure of a rotating mechanism;

[0041] Figure 3 shows a schematic diagram of the three-dimensional structure of the clamping mechanism;

[0042] Figure 4 A schematic diagram of a partial three-dimensional structure of the clamping mechanism is shown;

[0043] Figure 5 shows a schematic diagram of a top cross-sectional structure of the clamping mechanism;

[0044] Figure 6 A partial three-dimensional cross-sectional structural diagram of the clamping mechanism and the pushing mechanism is shown;

[0045] Figure 7 A schematic diagram of the front cross-sectional structure of the clamping mechanism and the pushing mechanism is shown;

[0046] Figure 8 Shown Figure 7 Schematic diagram of the enlarged structure at A in the middle;

[0047] Figure 9 A partial three-dimensional structural diagram of the adjustment mechanism on the clamping mechanism is shown;

[0048] Figure 10 A schematic diagram of the three-dimensional cross-sectional structure of the slide and the positioning rod is shown;

[0049] Figure 11 A schematic diagram of the three-dimensional structure of the measuring piece in the pushed-out state is shown;

[0050] Figure 12 A schematic diagram of the three-dimensional disassembled structure of the electric control push rod, the measuring piece and the threaded sleeve is shown;

[0051] Figure 13 A schematic diagram of the front cross-sectional structure of the locking mechanism is shown;

[0052] Figure 14 Shown Figure 13 Schematic diagram of the enlarged structure at B in the middle;

[0053] Figure 15 A schematic diagram of the three-dimensional structure of the collar is shown.

[0054] Legend:

[0055] 10. Power source; 20. Placement rack; 30. Brake drum body;

[0056] 40. Rotating mechanism; 41. Rotating chamber; 42. Rotating disk; 43. Transmission rod; 44. Mounting shaft;

[0057] 50. Clamping mechanism; 51. Positioning plate; 511. Positioning groove; 52. Housing; 521. Accommodating cavity; 522. Slide rail; 523. Slide table; 53. Clamp; 54. Positioning rod; 541. Inner cavity; 55. Movable rod;

[0058] 60. Pushing mechanism; 61. Electric push rod; 62. Threaded sleeve; 63. Mounting seat; 64. Measuring piece;

[0059] 70. Adjustment mechanism; 71. Limiting shaft; 72. Connecting rod; 73. Articulated shaft; 74. Eccentric wheel; 75. Rotating shaft;

[0060] 80. Locking mechanism; 81. Rotating groove; 82. Collar; 821. Internal threaded ring; 822. Engaging ring; 823. Tooth; 83. Pushing member; 84. Abutting member; 85. Lifting rod; 86. Position-limiting rack; 87. Contact-avoiding cavity;

[0061] 90. Drive motor. DETAILED DESCRIPTION

[0062] The following will clearly and completely describe the technology of an automated brake drum balance detection device according to the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0063] In order to solve the problem that the existing dynamic balance detection equipment does not have the function of detecting the thickness change of the inner and outer walls, which easily leads to the technicians making wrong judgments on the brake drum defects, the present invention proposes an automated brake drum dynamic balance detection equipment, such as Figure 1 - Figure 14 As shown:

[0064] The power source 10 is comprised of a mounting frame 20 mounted on the power source 10 and a brake drum body 30. The mounting frame 20 is provided with a rotating mechanism 40 connected to the output end of the power source 10. Figure 2 As shown, the rotating mechanism 40 includes a rotating disk 42 driven to rotate by the power source 10, and the rotating mechanism 40 also includes a rotating chamber 41 mounted on the placement frame 20. The rotating disk 42 is rotatably arranged inside the rotating chamber 41. A mounting shaft 44 that passes through the middle of the rotating disk 42 is mounted in the middle of the rotating chamber 41, and the positioning plate 51 is fixedly mounted on the mounting shaft 44.

[0065] A transmission rod 43 is installed at the output end of the power source 10, and the transmission rod 43 and the rotating disk 42 are meshed with each other. When the power source 10 rotates, the transmission rod 43 drives the rotating disk 42 to rotate around the mounting shaft 44.

[0066] A clamping mechanism 50 is mounted on the rotating disk 42. Figure 3 and Figure 4 As shown, the clamping mechanism 50 includes a housing 52 mounted on the rotating disk 42. A plurality of housings 52 are combined into a truncated table for placing the brake drum body 30. A clamp 53 is provided on the housing 52 and a movable rod 55 that can be raised and lowered is provided at the bottom of the clamp 53.

[0067] A positioning plate 51 is provided in the middle of the plurality of housings 52. Figure 5 As shown, a positioning groove 511 is provided on the surface of the positioning disk 51 for the movable rod 55 to be inserted. When the rotating disk 42 rotates, the positioning groove 511 pushes the movable rod 55 to move and drives the multiple clamps 53 to move horizontally along the center line of the truncated cone synchronously until they are in contact with the inner wall of the brake drum body 30.

[0068] The housing 52 further includes a slide rail 522 mounted in the accommodating cavity 521 and a slide platform 523 slidably embedded in the slide rail 522. Figure 6 As shown, a straight groove is provided in the middle of the slide rail 522 for the positioning rod 54 to move;

[0069] The clamp 53 and the positioning rod 54 are respectively installed on the top and bottom of the slide 523, and the movable rod 55 is movably sleeved on the surface of the positioning rod 54 and is raised and lowered by the adjustment mechanism 70;

[0070] When the brake drum body 30 needs to be inspected, the brake drum body 30 is placed on a circular platform consisting of multiple shells 52 with the mounting shaft 44 as the center. The preferred number of shells 52 is 8. At this time, the power source 10 is started again, so that the power source 10 drives the transmission rod 43 to rotate and transmits torque to the rotating disk 42, so that the rotating disk 42 can drive the eight shells 52 to rotate within the limitation of the rotating chamber 41.

[0071] Since the positioning disk 51 is fixed and the movable rod 55 is inserted into the positioning groove 511 at this time, during the rotation of the shell 52, the movable rod 55 will contact the positioning groove 511 and move under the push of the inner wall of the positioning groove 511. The movable rod 55 drives the slide 523 to move under the guidance of the slide rail 522 through the positioning rod 54. The slide 523 can drive the clamp 53 to move and fit on the inner wall of the brake drum body 30. When the wall thickness of the brake drum body 30 does not change due to deformation, the multiple clamps 53 are tightly fitted with the inner wall of the brake drum body 30 until the clamp 53 cannot move, the rotating disk 42 and the shell 52 cannot continue to rotate, the brake drum body 30 is fixed, and the power source 10 temporarily stops.

[0072] At this time, the restriction of the positioning plate 51 on the rotation of the rotating plate 42 is released by the adjusting mechanism 70. Figure 8 and Figure 9 As shown, the adjustment mechanism 70 includes a rotating shaft 75 rotatably mounted on the positioning rod 54 and a limiting shaft 71 mounted on the movable rod 55. An eccentric wheel 74 is mounted on the rotating shaft 75, and a connecting rod 72 is sleeved and mounted on the limiting shaft 71. The connecting rod 72 is rotatably connected to the eccentric wheel 74 via a hinge shaft 73. When the eccentric wheel 74 rotates, the connecting rod 72 is pushed and pulled to drive the movable rod 55 to rise and fall.

[0073] By rotating the rotating shaft 75, the rotating shaft 75 drives the hinge shaft 73 to rotate around the rotating shaft 75 through the eccentric wheel 74. During the rotation process, the hinge shaft 73 pushes and pulls the rotating shaft 75 through the connecting rod 72, so that the rotating shaft 75 can drive the movable rod 55 to rise and fall on the surface of the positioning rod 54. After the movable rod 55 is moved out of the positioning groove 511, the contact is limited, and the positioning disk 51 no longer restricts the rotation of the rotating disk 42. At this time, the power source 10 is started again to perform a dynamic balancing test.

[0074] At the same time, a locking mechanism 80 is provided inside the slide 523 and is engaged with the threaded sleeve 62. Figure 10 As shown, the locking mechanism 80 includes a rotation groove 81 provided in the middle of the slide 523, and a collar 82 is rotatably provided in the rotation groove 81. The collar 82 includes an internal threaded ring 821 having an inner wall provided with threads that mesh with the threaded sleeve 62. The internal threaded ring 821 is rotatably embedded in the rotation groove 81 through an interlocking ring 822 provided on the outer edge.

[0075] The positioning rod 54 defines an inner cavity 541 , and a pusher 83 is rotatably disposed in the middle of the inner cavity 541 . A contact-avoiding cavity 87 is defined at the junction of the positioning rod 54 and the rotating slot 81 , and a lifting rod 85 is disposed through the middle of the contact-avoiding cavity 87 .

[0076] The upper and lower ends of the lifting rod 85 are respectively equipped with a limit rack 86 that meshes with the teeth 823 and an abutment member 84 that abuts against the pushing member 83;

[0077] When the movable rod 55 is moved out of the positioning groove 511 by lifting, the clamp 53 can also be moved by the pushing mechanism 60. Figure 6 As shown, the pushing mechanism 60 includes an electrically controlled push rod 61 installed in the housing 52 , and the electrically controlled push rod 61 pushes the clamp 53 to continue moving to fit the deformed position of the brake drum body 30 ;

[0078] The pushing mechanism 60 further includes a mounting seat 63 disposed at the end of the accommodating cavity 521 , wherein an outer surface of the mounting seat 63 is configured to be arc-shaped and has the same curvature as the outer wall of the housing 52 ;

[0079] A threaded sleeve 62 is mounted on the mounting seat 63, and a thread engaging with the threaded sleeve 62 is provided in the middle of the slide 523;

[0080] When the movable rod 55 is inserted into the positioning groove 511, the positioning rod 54 and the movable rod 55 move along the inner wall track of the positioning groove 511. At the same time, since the abutment member 84 is not abutted by the pushing member 83, the lifting rod 85 drives the abutment member 84 and the limiting rack 86 to descend under the action of gravity, and the limiting rack 86 is disengaged from the engagement with the teeth 823 and is retracted into the contact avoidance cavity 87. At this time, since there is no restriction of the limiting rack 86, the internal threaded ring 821 can rotate in the rotating groove 81 under the cooperation of the fitting ring 822. When the slide 523 moves horizontally under the restriction of the slide rail 522, the internal threaded ring 821 moves with the slide 523 on the surface of the threaded sleeve 62. At this time, since the internal threaded ring 821 is not restricted, the internal threaded ring 821 only rotates inside the rotating groove 81 when it is engaged with the threaded sleeve 62, thereby not affecting the normal movement of the slide 523.

[0081] When the thickness of the inner wall of the brake drum body 30 changes due to deformation, part of the clamp 53 cannot abut against the inner wall of the brake drum body 30 when moving the same distance. In this case, the movable rod 55 needs to be removed from the positioning groove 511.

[0082] When the push rod 83 is extended, the sliding plate 523 is moved forward, and the sliding plate 523 is moved forward, so that the inner wall of the brake drum body 30 is not moved.

[0083] In order to record the deformation degree, Figure 11 and 12 As shown, a measuring piece 64 is installed at the end of the output end of the electric control push rod 61 and passes through the mounting seat 63. The surface of the measuring piece 64 is engraved with a scale. According to the length of the part of the measuring piece 64 extending from the mounting seat 63, the deformation of the inner wall of the brake drum body 30 can be obtained.

[0084] At the same time, in order to synchronize the rise of the movable rod 55 and the engagement of the limiting rack 86 with the collar 82, a through hole is opened in the middle of the pusher 83, and a rotating shaft 75 is provided through the middle of the through hole;

[0085] When the rotating shaft 75 rotates and pulls the movable rod 55 to lift up and release the connection with the positioning plate 51, the pushing member 83 rotates with the rotating shaft 75 and pushes the abutting member 84 to rise. The abutting member 84 pushes the limiting rack 86 to rise through the lifting rod 85. After the limiting rack 86 reaches the highest point, it meshes with the teeth 823, thereby realizing the switching of the movement mode of the slide 523 and the release of the fixation of the slide 523.

[0086] A driving motor 90 is also mounted on the positioning rod 54 , and the end of the rotating shaft 75 close to the driving motor 90 is connected to the output end of the driving motor 90 .

[0087] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited to this. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes to an automated brake drum balance detection device and its inventive concept according to the technology of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. An automated brake drum balance detection device, comprising a power source (10), a placement frame (20) mounted on the power source (10), and a brake drum body (30), characterized in that: The placement rack (20) is provided with a rotating mechanism (40) connected to the output end of the power source (10), the rotating mechanism (40) includes a rotating disk (42) driven to rotate by the power source (10), and a clamping mechanism (50) is installed on the rotating disk (42); The clamping mechanism (50) includes a plurality of housings (52) mounted on the rotating disk (42), the housings (52) including a receiving cavity (521), a slide rail (522) mounted in the receiving cavity (521), and a slide table (523) slidably embedded on the slide rail (522), and a clamp (53) and a movable rod (55) that can be lifted and lowered are provided on the slide table (523); A pushing mechanism (60) is provided in the housing (52), and the pushing mechanism (60) includes an electric push rod (61) installed in the housing (52) and a mounting seat (63) provided at the end of the accommodating cavity (521). A measuring piece (64) penetrating the mounting seat (63) is installed at the end of the output end of the electric push rod (61), and a scale is engraved on the surface of the measuring piece (64). A threaded sleeve (62) is installed on the mounting seat (63), and the connection between the slide (523) and the threaded sleeve (62) is controlled by a locking mechanism (80); The locking mechanism (80) includes a collar (82) rotatably arranged in a slide (523) and meshing with a threaded sleeve (62), the collar (82) being provided with teeth (823), an inner cavity (541) being provided inside a positioning rod (54), a contact-avoiding cavity (87) being provided at a junction between the positioning rod (54) and the rotating groove (81), a lifting rod (85) being provided through the middle of the contact-avoiding cavity (87), and a limiting rack (86) being provided at the upper end of the lifting rod (85) and meshing with the teeth (823); A positioning disk (51) is provided in the plurality of accommodating cavities (521). When the movable rod (55) is inserted into the positioning groove (511) provided on the surface of the positioning disk, the rotating disk (42) rotates to push the plurality of clamps (53) to move horizontally along the center line until they are in contact with the inner wall of the brake drum body (30), and the positions of the electric control push rod (61) and the threaded sleeve rod (62) remain unchanged. When the collar (82) and the limiting rack (86) are engaged, the electric control push rod (61) extends and drives the slide (523) to move through the threaded sleeve (62) until the slide (523) drives the clamp (53) to abut against the inner wall of the deformed brake drum body (30).

2. The automatic brake drum balance detection device according to claim 1, characterized in that: The rotating mechanism (40) further comprises a rotating chamber (41) mounted on the placement frame (20), a rotating disk (42) rotatably arranged inside the rotating chamber (41), a mounting shaft (44) penetrating the middle of the rotating disk (42) is mounted in the middle of the rotating chamber (41), and a positioning disk (51) is fixedly mounted on the mounting shaft (44); A transmission rod (43) is installed at the output end of the power source (10), and the transmission rod (43) and the rotating disk (42) are meshed with each other. When the power source (10) rotates, the transmission rod (43) drives the rotating disk (42) to rotate with the installation shaft (44) as the axis.

3. The automatic brake drum balance detection device according to claim 1, characterized in that: A positioning rod (54) is provided at the bottom of the slide (523), a straight groove for the positioning rod (54) to move is provided in the middle of the slide rail (522), and a movable rod (55) is movably sleeved on the surface of the positioning rod (54) and is lifted and lowered by an adjusting mechanism (70).

4. The automatic brake drum balance detection device according to claim 3, characterized in that: The adjusting mechanism (70) includes a rotating shaft (75) rotatably mounted on the positioning rod (54) and a limiting shaft (71) mounted on the movable rod (55). An eccentric wheel (74) is mounted on the rotating shaft (75), and a connecting rod (72) is sleeved and mounted on the limiting shaft (71). The connecting rod (72) and the eccentric wheel (74) are rotatably connected via a hinge shaft (73). When the eccentric wheel (74) rotates, the connecting rod (72) is pushed and pulled to drive the movable rod (55) to rise and fall.

5. The automatic brake drum balance detection device according to claim 1, characterized in that: An outer side of the mounting seat (63) is configured to be arc-shaped and has the same arc as the outer wall of the housing (52).

6. The automatic brake drum balance detection device according to claim 1, characterized in that: The locking mechanism (80) further comprises a rotation groove (81) provided in the middle of the slide (523), a collar (82) being rotatably arranged in the rotation groove (81), the collar (82) comprising an internal threaded ring (821) having a threaded surface provided on the inner wall thereof and meshing with the threaded sleeve rod (62), the internal threaded ring (821) being rotatably embedded in the rotation groove (81) via an engaging ring (822) provided on the outer edge thereof, and teeth (823) being provided on the internal threaded ring (821).

7. The automatic brake drum balance detection device according to claim 6, characterized in that: An inner cavity (541) is provided inside the positioning rod (54), and a pushing member (83) is rotatably provided in the middle of the inner cavity (541). A contact-avoiding cavity (87) is provided at the junction of the positioning rod (54) and the rotating groove (81). The lifting rod (85) is provided through the contact-avoiding cavity (87), and an abutting member (84) abutting against the pushing member (83) is further provided on the lifting rod (85).

8. The automatic brake drum balance detection device according to claim 7, characterized in that: A through hole is provided in the middle of the pushing member (83), and a rotating shaft (75) is provided through the middle of the through hole; When the rotating shaft (75) is lifted by rotating and pulling the movable rod (55) to release the connection with the positioning plate (51), the pushing member (83) rotates with the rotating shaft (75) and pushes the abutting member (84) to rise, and the abutting member (84) pushes the limiting rack (86) to rise and engage with the teeth (823) through the lifting rod (85).

9. The automatic brake drum balance detection device according to claim 8, characterized in that: A driving motor (90) is also mounted on the positioning rod (54), and the end of the rotating shaft (75) close to one side of the driving motor (90) is connected to the output end of the driving motor (90).

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