Drum brake pad hole depth testing fixture

Abstract

The invention provides a drum brake pad hole depth gauge, which comprises a base, a row of detection mechanisms corresponding to a row of riveting holes of a drum brake pad, and a force application mechanism, and is characterized in that each detection mechanism comprises a pressure sensor and an elastic member, and the pressure sensor is movably arranged at the outer side of the base and can move along the radial direction of the arc-shaped reference surface of the base; one end of the elastic piece is fixedly connected with a measuring head of the pressure sensor; and the distance between the end part of the measuring head of one pressure sensor and the far end of the elastic piece is greater than the distance between the end parts of the measuring heads of other pressure sensors and the far end of the corresponding elastic piece, so that only the measuring head of the pressure sensor is supported on the step surface of the corresponding riveting hole when the force applying mechanism applies pressure. The drum brake pad hole depth gauge can measure the hole depths of a plurality of riveting holes in a row of riveting holes of a drum brake pad at the same time, and compared with the prior art that only one hole can be measured at a time, the drum brake pad hole depth gauge greatly improves the detection efficiency of the riveting holes of the drum brake pad.

Description

Technical Field

[0001] The invention relates to the technical field of brake pad measurement, in particular to a drum brake pad hole depth inspection tool. Background Art

[0002] After the drum brake pads are produced and processed, it is usually necessary to measure the riveting holes on the brake pads. Figure 1 Shows the distribution of riveting holes on a drum brake pad cross section ( Figure 1 The cross section of the drum brake pad shows 4 holes, which are arranged in a row along the arc direction of the drum brake pad. The depth of the small diameter holes of the 4 riveted holes, i.e. H1, H2, H3, and H4, needs to be measured. The traditional drum brake pad hole depth detection method uses visual comparison, making a round rod that matches the hole and visually checking whether the round rod is higher or lower than the hole. This rough detection method cannot accurately determine the hole depth data, and the measurement error is as high as 0.15-0.30mm.

[0003] Patent publication number CN216115798 discloses a brake pad measuring device, which can only measure one hole at a time when used to measure the depth of a riveted hole. After measuring one hole, the brake pad needs to be removed and then repositioned before measuring the next hole, resulting in very low measurement efficiency. Summary of the invention

[0004] Based on the above-mentioned problems existing in the prior art, the present invention aims to solve the technical problem that the brake pad measuring device in the prior art can only measure one hole at a time, and after measuring one hole, the brake pad needs to be removed and then replaced and positioned again before measuring the next hole, resulting in very low measurement efficiency.

[0005] The present invention provides a drum brake pad hole depth inspection tool, which comprises:

[0006] A base, the surface of which is formed with an arc-shaped reference surface for placing a drum brake pad;

[0007] A plurality of detection mechanisms corresponding to the plurality of riveting holes of the drum brake pad, the detection mechanisms comprising a pressure sensor and an elastic member, the detection mechanisms being movably arranged on the outer side of the base and being movable along the radial direction of the arc-shaped reference surface of the base; one end of the elastic member being fixedly connected to the measuring head of the pressure sensor;

[0008] A force-applying mechanism, used to apply the same pressure to all the detection mechanisms at the same time, so that the distal ends of all the elastic members extend into the corresponding riveting holes and are supported on the stepped surface;

[0009] The distance between the end of one of the pressure sensor measuring head and the distal end of the elastic member is greater than the distance between the end of the other pressure sensor measuring head and the distal end of the corresponding elastic member.

[0010] According to an embodiment of the present invention, the drum brake pad hole depth gauge further comprises a brake pad positioning and adjusting mechanism, and the brake pad positioning and adjusting mechanism comprises a material blocking component and a material pushing component;

[0011] The material blocking assembly comprises a first rotating driving member and an L-shaped blocking arm, wherein the first rotating driving member is used to drive the L-shaped blocking arm to rotate along an extending direction parallel to an arc-shaped reference plane of the base;

[0012] The pusher assembly comprises a second rotating driving member and a push arm, wherein the second rotating driving member is used to drive the push arm to rotate along an extending direction parallel to the arc-shaped reference surface of the base;

[0013] When the L-shaped blocking arm and the pushing arm move toward each other or move away from each other, they can respectively clamp or release the drum brake pad placed on the arc-shaped reference surface of the base.

[0014] According to an embodiment of the present invention, the first rotation driving member and the second rotation driving member respectively drive the L-shaped blocking arm and the push arm to rotate synchronously and in the same direction, so as to switch the riveting holes to be inspected.

[0015] According to an embodiment of the present invention, a side wall of the push arm facing the L-shaped blocking arm extends obliquely toward the outside of the base to cooperate with the arc-shaped reference surface of the base to form a V-shaped groove.

[0016] According to one embodiment of the present invention, when the push arm and the L-shaped stop arm are closed, they can enclose and form a U-shaped groove or a "mouth"-shaped groove for clamping and positioning the drum brake pad placed on the arc-shaped reference surface of the base.

[0017] According to an embodiment of the present invention, when the push arm and the L-shaped stop arm are closed, a U-shaped groove is formed; the drum brake pad hole depth inspection tool also includes a loading mechanism for loading the drum brake pad to be inspected onto the base; the loading mechanism includes:

[0018] A buffering table, fixedly arranged on one side of the base and located in the opening direction of the U-shaped groove;

[0019] A material frame is fixedly arranged on the surface of the material buffering platform and enclosed with the material buffering platform to form a material discharge area with an open top, and drum brake pads can be stacked and placed in the material discharge area;

[0020] A material pushing cylinder is fixedly arranged on a side of the material buffer table away from the base;

[0021] A push plate is fixedly connected to the piston rod; when the piston rod of the push cylinder is extended, the bottom drum brake pad in the material frame can be pushed into the U-shaped groove through the push plate.

[0022] According to one embodiment of the present invention, the surface of the cache material table is formed with an arc-shaped base surface for placing drum brake pads, the push plate is an arc-shaped push plate with a thickness less than the thickness of the drum brake pads, and the bottom of the push plate is slidably matched with the arc-shaped base surface of the cache material table; the material frame is provided with an arc-shaped discharge port on the side wall facing the base, and the height of the arc-shaped discharge port is less than the thickness of the drum brake pads.

[0023] According to one embodiment of the present invention, the drum brake pad hole depth gauge also includes a fixing frame fixedly arranged on the outside of the base and a mounting frame slidably connected to the fixing frame, the mounting frame can slide radially along the arc-shaped reference surface of the base on the fixing frame, and the plurality of pressure sensors are fixedly arranged on the mounting frame; the output end of the force-applying mechanism is fixedly connected to the mounting frame.

[0024] According to an embodiment of the present invention, the plurality of pressure sensors are located directly above the arc-shaped reference surface of the base, and the mounting bracket is slidably disposed on the fixing bracket along a vertical direction.

[0025] According to an embodiment of the present invention, the force applying mechanism comprises:

[0026] A counterweight block is detachably fixed on the mounting frame;

[0027] An operating rod, one end of which is hinged to the top of the fixing frame, and a strip groove is provided in the middle of the operating rod;

[0028] A connecting rod has one end hinged to the counterweight or the mounting frame, and the other end movably connected to the strip groove via a pin.

[0029] The beneficial effects of the present invention are:

[0030] The drum brake pad hole depth inspection tool provided by the present invention can simultaneously measure the hole depths of multiple riveting holes of the drum brake pad. Compared with the prior art that can only measure one hole at a time, the inspection efficiency of the riveting holes of the drum brake pad is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the distribution position of the riveting holes on the cross section of the drum brake pad;

[0033] Figure 2 It is a structural schematic diagram of a drum brake pad hole depth inspection tool provided by an embodiment of the present invention;

[0034] Figure 3 It is a left view of a drum brake pad hole depth inspection tool provided by an embodiment of the present invention;

[0035] Figure 4 yes Figure 3 A schematic cross-sectional view of the middle part;

[0036] Figure 5 is a structural schematic diagram of a brake pad positioning and adjusting mechanism in an embodiment of the present invention;

[0037] Figure markings: 100-brake pad; 1-base; 2-detection mechanism; 21-pressure sensor; 210-measuring head; 22-elastic member; 23-pressure block; 3-force-applying mechanism; 31-counterweight block; 32-operating rod; 320-strip groove; 33-connecting rod; 4-brake pad positioning and adjustment mechanism; 41-material blocking assembly; 411-first rotating drive member; 412-L-shaped blocking arm; 42-pushing assembly; 421-second rotating drive member; 422-pushing arm; 4220-V-shaped groove; 5-feeding mechanism; 51-cache table; 52-material frame; 53-pushing cylinder; 54-pushing plate; 6-fixed frame; 7-mounting frame. DETAILED DESCRIPTION

[0038] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented.

[0039] The present invention provides a drum brake pad hole depth inspection tool, the structure of which is as follows: Figure 2 and Figure 3As shown, it includes a base 1, a plurality of detection mechanisms 2 corresponding to a plurality of riveting holes of a drum brake pad 100, and a force-applying mechanism 3, wherein the surface of the base 1 is formed with an arc-shaped reference surface for placing the drum brake pad 100; generally, the outer arc surface of the drum brake pad 100 has a plurality of stepped riveting holes distributed in an array, wherein each row of riveting holes is arranged along the arc direction of the drum brake pad 100, and each column of riveting holes is arranged in a straight line along the width direction of the drum brake pad 100; the plurality of detection mechanisms 2 are arranged in a row in a direction parallel to the column of the array riveting holes, preferably, in order to reduce the number of the detection mechanisms 2 as much as possible while ensuring the detection efficiency, so as to simplify the structure of the inspection fixture, in a column of detection mechanisms 2, the number of the detection mechanisms 2 is equal to the number of riveting holes in a column of the drum brake pad 100. The detection mechanism 2 includes a pressure sensor 21 and an elastic member 22. The detection mechanism 2 is movably arranged on the outer side of the base 1 and can move radially along the arc-shaped reference surface of the base 1. One end of the elastic member 22 is fixedly connected to the measuring head 210 of the pressure sensor 21. Specifically, the elastic member 22 is a spring, and the top end of the measuring head of the pressure sensor 21 is located inside the spring. The force-applying mechanism 3 is used to apply the same pressure to all the detection mechanisms 2 at the same time, so that the distal ends of all the elastic members 22 extend into the corresponding riveting holes and are supported on the stepped surface.

[0040] like Figure 4 Shown is Figure 3 In the partial cross-sectional schematic diagram A, the distance between the end of the measuring head 210 of one of the pressure sensors 21 and the distal end of the elastic member 22 is greater than the distance between the end of the measuring head 210 of the other pressure sensors 21 and the distal end of the corresponding elastic member 22, so that when the force-applying mechanism 3 applies pressure, only the measuring head 210 of the pressure sensor 21 is supported on the stepped surface of the corresponding riveting hole.

[0041] It is not difficult to understand that in actual measurement, the longest measuring head 210 and the elastic member 22 belonging to the same detection mechanism 2 will abut against the corresponding stepped surface of the same riveting hole. According to the elastic force formula: F=kX, the pressure reading of the pressure sensor 21 in the detection mechanism 2 is read out at this time, and the deformation X of the elastic member 22 is calculated according to the known elastic coefficient k of the elastic member 22, which is the depth of the small diameter hole of the riveting hole (the elastic member 22 is in the original length state, and the reading of the pressure sensor 21 is zero). Because:

[0042] ΔF=k·ΔX

[0043] Wherein, ΔF represents the difference between the indication of the pressure sensor 21 with the longest measuring head 210 and the indication of other pressure sensors 21, and ΔX represents the difference between the hole depth measured by the pressure sensor 21 with the longest measuring head 210 and the hole depth measured by other pressure sensors 21;

[0044] While reading the indication of the pressure sensor 21 with the longest measuring head 210, the indications of other pressure sensors 21 are read out. According to the above formula, the difference in depth between the riveted hole and other riveted holes can be obtained. The measured hole depth of the riveted hole is subtracted from the difference in hole depth to obtain the hole depth of other riveted holes (i.e., the depth of the small-diameter holes of other riveted holes).

[0045] The drum brake pad hole depth inspection tool provided by the present invention can simultaneously measure the hole depths of multiple rivet holes in a row of rivet holes of the same drum brake pad. Compared with the prior art that can only measure one hole at a time, the inspection efficiency of the rivet holes of the drum brake pad is greatly improved.

[0046] Please refer to Figure 1 and Figure 5 In order to position the drum brake pad 100 placed on the arc-shaped reference surface of the base 1 to ensure the hole depth detection accuracy, according to an embodiment of the present invention, the drum brake pad hole depth gauge further includes a brake pad positioning and adjustment mechanism 4, and the brake pad positioning and adjustment mechanism 4 includes a material blocking assembly 41 and a material pushing assembly 42. The material blocking assembly 41 includes a first rotating driving member 411 and an L-shaped blocking arm 412, and the output end of the first rotating driving member 411 is fixedly connected to the L-shaped blocking arm 412, and is used to drive the L-shaped blocking arm 412 to rotate along a direction parallel to the arc-shaped reference surface of the base 1; the material pushing assembly 42 includes a second rotating driving member 421 and a push arm 422, and the output end of the second rotating driving member 421 is fixedly connected to the push arm 422, and is used to drive the push arm 422 to rotate along a direction parallel to the arc-shaped reference surface of the base 1. It is not difficult to understand that when the L-shaped retaining arm 412 and the push arm 422 move toward or away from each other, they can respectively clamp or release the drum brake pad 100 placed on the arc-shaped reference surface of the base 1. Specifically, when the push arm 422 and the L-shaped retaining arm 412 are closed, they can enclose a U-shaped groove or a "mouth"-shaped groove to clamp and position the drum brake pad 100 placed on the arc-shaped reference surface of the base 1.

[0047] In order to be able to adjust the position of the drum brake pad 100 on the arc-shaped reference surface of the base 1 so that the next row of riveted holes to be inspected corresponds to the inspection mechanisms 2 arranged in a row, when the push arm 422 and the L-shaped stop arm 412 are closed, the first rotating drive member 411 and the second rotating drive member 421 respectively drive the L-shaped stop arm 412 and the push arm 422 to rotate synchronously and in the same direction, thereby switching the riveted holes to be inspected.

[0048] It can be understood that when the detection mechanism 2 needs to detect different columns of riveted holes, it is only necessary to rotate the drum brake pad 100 to adjust its position on the arc-shaped reference plane of the base 1 to switch the column of riveted holes to be detected; and the L-shaped stop arm 412 and the push arm 422 rotate synchronously and in the same direction, that is, one column of riveted holes can be switched at a time, which is more convenient to adjust and has higher accuracy.

[0049] Please continue to refer to Figure 5 According to an embodiment of the present invention, the push arm 422 extends obliquely toward the outer side of the base 1 toward a side wall of the L-shaped blocking arm 412 to cooperate with the arc-shaped reference surface of the base 1 to form a V-shaped groove 4220.

[0050] It can be understood that when the L-shaped stop arm 412 and the push arm 422 cooperate to clamp and position the drum brake pad 100 placed on the arc-shaped reference surface of the base 1, the V-shaped groove 4220 formed between the side wall of the push arm 422 and the arc-shaped reference surface of the base 1 can press the drum brake pad 100 against the arc-shaped reference surface of the base 1 from the thickness direction of the drum brake pad 100, thereby improving the hole depth detection accuracy.

[0051] According to an embodiment of the present invention, when the push arm 422 and the L-shaped stop arm 412 are closed and enclosed to form a U-shaped groove, the drum brake pad hole depth inspection tool further includes a loading mechanism 5 for loading the drum brake pad 100 to be inspected onto the base 1; please continue to refer to Figure 2 or Figure 3 The feeding mechanism 5 includes a buffering table 51, a material frame 52, a pushing cylinder 53 and a pushing plate 54, wherein the buffering table 51 is fixedly arranged on one side of the base 1 and is located in the opening direction of the U-shaped groove; the material frame 52 is fixedly arranged on the surface of the buffering table 51, and together with the buffering table 51, forms a discharge area with an open top, and the drum brake pads 100 can be stacked and placed in the discharge area; the pushing cylinder 53 is fixedly arranged on the side of the buffering table 51 away from the base 1; the pushing plate 54 is fixedly connected to the piston rod of 53; when the piston rod of the pushing cylinder 53 is extended, the drum brake pad at the bottom layer of the material frame 52 can be pushed into the U-shaped groove through the pushing plate 54.

[0052] It can be understood that by using the feeding mechanism 5 to replace the traditional manual feeding, in actual operation, it is only necessary to put a stack of drum brake pads 100 (multiple drum brake pads 100 are stacked to form a stack) into the material frame 52, and the piston rod of the pushing cylinder 53 can be extended to drive the pushing plate 54 to push the bottom piece of the stack of brake pads to the surface of the base 1. The feeding operation is safer and can avoid safety accidents caused by the operation of the brake pad positioning and adjustment mechanism 4 during manual feeding.

[0053] Furthermore, the surface of the cache material storage table 51 is formed with an arc-shaped base surface for placing drum brake pads, so as to adapt to the inner arc surface of the drum brake pad 100; in order to ensure that the feeding mechanism 5 only feeds the bottom layer of drum brake pad 100 at a time, the push plate 54 is an arc-shaped push plate with a thickness less than the thickness of the drum brake pad 100, and the bottom of the push plate 54 is slidably matched with the arc-shaped base surface of the cache material storage table 51; the material frame 52 is provided with an arc-shaped discharge port toward the side wall of the base 1, and the height of the arc-shaped discharge port is less than the thickness of the drum brake pad 100.

[0054] According to an embodiment of the present invention, in order to realize the radial movement of the detection mechanism 2 along the arc-shaped reference surface of the base 1, the drum brake pad hole depth gauge also includes a fixing frame 6 fixedly arranged on the outside of the base 1 and a mounting frame 7 slidably connected to the fixing frame 6, the mounting frame 7 can slide radially along the arc-shaped reference surface of the base 1 on the fixing frame 6, and the plurality of pressure sensors 21 are fixedly arranged on the mounting frame 7; the output end of the force-applying mechanism 3 is fixedly connected to the mounting frame 7. As a specific embodiment, the plurality of pressure sensors 21 are located directly above the arc-shaped reference surface of the base 1, and the mounting frame 7 is slidably arranged on the fixing frame 6 along the vertical direction.

[0055] It should be noted that arranging a plurality of the pressure sensors 21 directly above the arc-shaped reference surface of the base 1 is only a preferred embodiment of the present invention, so that the force-applying mechanism 3 can be provided with a counterweight block to apply pressure to the detection mechanism 2 by gravity.

[0056] Please continue to refer to Figure 2 Specifically, the force-applying mechanism 3 includes a counterweight block 31, an operating rod 32 and a connecting rod 33, wherein the counterweight block 31 is detachably fixed on the mounting frame 7; one end of the operating rod 32 is hinged to the top of the fixing frame 6, and a strip groove 320 is opened in the middle of the operating rod 32; one end of the connecting rod 33 is hinged to the counterweight block 31 or the mounting frame 7, and the other end is movably connected to the strip groove 320 through a pin.

[0057] It can be understood that, in the force-applying mechanism 3, a gravity block 31 is arranged on the mounting frame 7, and gravity is applied to make the bottom end of the measuring head 210 of the pressure sensor 21 or the bottom end of the elastic member 22 press against the stepped surface of the riveting hole of the drum brake pad 100, so as to facilitate the force-applying operation and ensure that the multiple detection mechanisms 2 are subjected to force simultaneously and equally.

[0058] In order to facilitate the understanding of the present invention, the following Figure 1-Figure 5 The working principle of this solution is described in detail:

[0059] In the first step, a stack of drum brake pads 100 to be tested is placed into the material frame 52 on the buffer material platform 51 .

[0060] In the second step, the pushing cylinder 53 is started to push the brake pad at the bottom of the stack to the arc-shaped reference surface of the base 1 through the pushing plate 54, and the piston rod of the pushing cylinder 53 is retracted.

[0061] The third step is to lift the counterweight 31 through the operating rod 32 .

[0062] In the fourth step, the second rotating drive member 421 is started to drive the push arm 422 to rotate toward the direction approaching the L-shaped stop arm 412. During the rotation of the push arm 422, the drum brake pad 100 is pushed to move on the arc-shaped reference surface of the base 1 until the drum brake pad 100 abuts against the L-shaped stop arm 412 (the initial position of the L-shaped stop arm 412 is set so that when the drum brake pad 100 abuts against the L-shaped stop arm 412, the first row of riveting holes on the drum brake pad 100 is just below a row of the detection mechanisms 2). At this time, the drum brake pad 100 is confined in the U-shaped groove formed when the L-shaped stop arm 412 and the push arm 422 are closed.

[0063] The fifth step is to operate the operating rod 32 to slowly lower the counterweight 31, the mounting frame 7 and the detection mechanism 2 until the measuring head 210 or the elastic member 22 of a row of the pressure sensors 21 abuts against the riveting holes in the row, and release the operating rod 32 to stabilize the reading of the pressure sensor 21.

[0064] The sixth step is to read the readings of all the pressure sensors in a row of detection mechanisms 2 at the same time, and calculate the depth of the small-diameter hole of the riveted hole corresponding to the longest measuring head 210 by the spring elastic formula, and then calculate the difference between the depth of the riveted hole and the depth of other riveted holes according to the difference between the reading of the pressure sensor 21 with the longest measuring head 210 and the readings of other pressure sensors 21. By subtracting the depth difference from the depth of the riveted hole, the depth of the small-diameter hole of other riveted holes in the row can be obtained.

[0065] In the seventh step, the counterweight block 31 is lifted by the operating rod 32 to remove the pressure on the detection mechanism 2. The first rotating drive member 411 and the second rotating drive member 421 respectively drive the L-shaped blocking arm 412 and the push arm 422 to rotate synchronously and in the same direction to switch the riveting holes to be detected, so that the second column of riveting holes is moved to the bottom of a column of the detection mechanism 2.

[0066] Step 8, repeat steps 5 to 7 until the hole depth detection of all riveting holes on the drum brake pad 100 is completed, and the detected drum brake pad 100 is removed.

[0067] In the ninth step, the second to eighth steps are repeated to realize batch operation of hole depth detection of a stack of drum brake pads 100.

[0068] To sum up, in a drum brake pad hole depth inspection tool provided by the present invention, a plurality of the inspection mechanisms 2 arranged in a row can simultaneously inspect the depths of a plurality of rivet holes in a row of rivet holes on a drum brake pad 100, and the brake pad positioning and adjustment mechanism 4 can adjust the position of the drum brake pad 100 on the arc-shaped reference plane of the base 1, thereby realizing the hole depth measurement of the rivet holes in different rows on the drum brake pad 100, which greatly improves the hole depth detection efficiency of the rivet holes on the drum brake pad 100.

[0069] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A drum brake pad hole depth inspection tool, It is characterized in that include: A base (1) having a surface formed with an arc-shaped reference surface for placing a drum brake pad (100); A plurality of detection mechanisms (2) corresponding to the plurality of riveting holes of the drum brake pad (100), the detection mechanisms (2) comprising a pressure sensor (21) and an elastic member (22), the detection mechanisms (2) being movably arranged on the outside of the base (1) and being movable along the radial direction of the arc-shaped reference surface of the base (1); one end of the elastic member (22) being fixedly connected to a measuring head (210) of the pressure sensor (21); A force-applying mechanism (3) is used to apply the same pressure to all the detection mechanisms (2) at the same time, so that the distal ends of all the elastic members (22) extend into the corresponding riveting holes and are supported on the stepped surface; The distance between the end of the measuring head (210) of one of the pressure sensors (21) and the distal end of the elastic member (22) is greater than the distance between the end of the measuring head (210) of the other pressure sensors (21) and the distal end of the corresponding elastic member (22).

2. A drum brake pad hole depth inspection tool according to claim 1, It is characterized in that It also includes a brake pad positioning and adjusting mechanism (4), wherein the brake pad positioning and adjusting mechanism (4) includes a material blocking component (41) and a material pushing component (42); The material blocking assembly (41) comprises a first rotating driving member (411) and an L-shaped blocking arm (412), wherein the first rotating driving member (411) is used to drive the L-shaped blocking arm (412) to rotate along an extension direction parallel to an arc-shaped reference plane of the base (1); The pusher assembly (42) comprises a second rotating driving member (421) and a push arm (422), wherein the second rotating driving member (421) is used to drive the push arm (422) to rotate along an extension direction parallel to an arc-shaped reference surface of the base (1); When the L-shaped blocking arm (412) and the pushing arm (422) move toward or away from each other, they can respectively clamp or release the drum brake pad (100) placed on the arc-shaped reference surface of the base (1).

3. A drum brake pad hole depth inspection tool according to claim 2, It is characterized in that The first rotating driving member (411) and the second rotating driving member (421) respectively drive the L-shaped blocking arm (412) and the pushing arm (422) to rotate synchronously and in the same direction, so as to switch the riveting holes to be inspected.

4. A drum brake pad hole depth inspection tool according to claim 2, It is characterized in that The push arm (422) extends obliquely toward the outer side of the base (1) toward a side wall of the L-shaped blocking arm (412) to cooperate with the arc-shaped reference surface of the base (1) to form a V-shaped groove (4220).

5. A drum brake pad hole depth inspection tool according to claim 2, It is characterized in that When the push arm (422) and the L-shaped stop arm (412) are closed together, a U-shaped groove or a "mouth"-shaped groove can be formed to clamp and position the drum brake pad (100) placed on the arc-shaped reference surface of the base (1).

6. A drum brake pad hole depth inspection tool according to claim 5, wherein when the push arm (422) and the L-shaped stop arm (412) are closed together, a U-shaped groove is formed; It is characterized in that It also includes a loading mechanism (5) for loading the drum brake pad (100) to be tested onto the base (1); the loading mechanism (5) includes: A buffer storage table (51) is fixedly arranged on one side of the base (1) and is located in the opening direction of the U-shaped groove; A material frame (52) is fixedly arranged on the surface of the buffer material platform (51) and is enclosed with the buffer material platform (51) to form a material discharge area with an open top, and drum brake pads (100) can be stacked and placed in the material discharge area; A material pushing cylinder (53) is fixedly arranged on a side of the material buffering platform (51) away from the base (1); A push plate (54) is fixedly connected to the piston rod of the (53); when the piston rod of the push cylinder (53) is extended, the bottom drum brake pad in the material frame (52) can be pushed into the U-shaped groove through the push plate (54).

7. A drum brake pad hole depth inspection tool according to claim 6, It is characterized in that The surface of the buffer material table (51) is formed with an arc-shaped base surface for placing drum brake pads, the push plate (54) is an arc-shaped push plate with a thickness less than the thickness of the drum brake pads, and the bottom of the push plate (54) is slidably matched with the arc-shaped base surface of the buffer material table (51); the material frame (52) is provided with an arc-shaped discharge port on the side wall facing the base (1), and the height of the arc-shaped discharge port is less than the thickness of the drum brake pads (100).

8. A drum brake pad hole depth inspection tool according to claim 1, It is characterized in that It also includes a fixing frame (6) fixedly arranged on the outside of the base (1) and a mounting frame (7) slidably connected to the fixing frame (6); the mounting frame (7) can slide on the fixing frame (6) along the radial direction of the arc-shaped reference surface of the base (1); and a plurality of pressure sensors (21) are fixedly arranged on the mounting frame (7); and the output end of the force-applying mechanism (3) is fixedly connected to the mounting frame (7).

9. A drum brake pad hole depth inspection tool according to claim 8, It is characterized in that The plurality of pressure sensors (21) are located directly above the arc-shaped reference surface of the base (1), and the mounting frame (7) is slidably arranged on the fixing frame (6) in a vertical direction.

10. A drum brake pad hole depth inspection tool according to claim 8, It is characterized in that The force applying mechanism (3) comprises: A counterweight block (31) is detachably fixed on the mounting frame (7); An operating rod (32), one end of which is hinged to the top end of the fixing frame (6), and a strip groove (320) is provided in the middle of the operating rod (32); A connecting rod (33) has one end hinged to the counterweight (31) or the mounting frame (7), and the other end movably connected to the strip groove (320) via a pin.

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