A quick detection device for heavy truck axle brake clearance

Abstract

In order to solve the problems of complicated process and low efficiency of vehicle axle brake gap detection, the present application provides a kind of quick detection device for heavy truck axle brake gap, comprising: a plurality of groups of stacked plug gauges, the left and right sides of the plug gauge body are provided with symmetrically distributed wing plates, the wing plates are fixedly connected with electric brushes, the included angles between the wing plates and the plug gauges on each group of plug gauges are different; sliding shell, including front cover, front shell, middle shell, rear shell and rear cover, the inner walls of the front shell and the rear shell are provided with left and right symmetrically distributed semicircular grooves, the inner wall of the middle shell is provided with a sliding resistance groove coated with a resistance material, the sliding resistance groove is correspondingly distributed with the electric brush, the electric brush can slide along the length direction of the sliding resistance groove, a compression spring is arranged between the wing plate and the rear cover; controller, the controller is electrically connected with the front end of the sliding resistance groove of the middle shell and the rear cover, respectively, can quickly detect the minimum value of the vehicle axle brake gap and the depth of the position of the minimum value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a rapid detection device for heavy automobile axle brake clearance. BACKGROUND

[0002] At present, when the automobile axle production line is detected, the clearance between the drum brake shoe and the brake drum needs to be measured by using a common caliper. The final clearance value can be obtained by adding all the caliper sizes. When the measured clearance is unqualified, the minimum depth position of the brake clearance needs to be known. The common caliper needs to be measured multiple times, and then the minimum depth position is obtained by measuring the clamped position of the caliper with a ruler. This not only has low accuracy, but also seriously affects the off-line rhythm of the automobile axle production line. SUMMARY

[0003] In order to solve the above problems, the present application provides a rapid detection device for heavy automobile axle brake clearance, which adopts the following technical scheme:

[0004] A rapid detection device for heavy automobile axle brake clearance, characterized in that it comprises:

[0005] The caliper body is provided with ten groups. The left and right sides of the caliper body are provided with symmetrically distributed wings. The wings are fixedly connected with electric brushes. The wings on each group of caliper bodies have different angles with the caliper body. The multiple groups of caliper bodies are stacked.

[0006] The sliding shell is composed of a front cover, a front shell, a middle shell, a rear shell and a rear cover connected in sequence. The front cover and the rear cover are provided with square sliding grooves at the lower ends for the multiple groups of caliper bodies to pass through. The inner walls of the front shell and the middle shell are provided with corresponding half-round grooves. The inner wall of the middle shell is provided with a sliding resistance groove coated with a resistance material. The half-round grooves and the sliding resistance groove are correspondingly distributed. In addition, a compression spring is arranged between the wings and the rear cover. When the multiple groups of caliper bodies are stacked, the multiple electric brushes are correspondingly distributed with the half-round grooves and the sliding resistance groove and can slide along the length direction of the half-round grooves and the sliding resistance groove.

[0007] The front cover, the front shell, the middle shell and the rear shell are made of insulating materials. The caliper body, the wings, the rear cover, the compression spring and the electric brush are made of conductive materials.

[0008] The controller is electrically connected with the ground wire of the controller through the first resistance at the front end of each sliding resistance groove of the middle shell. Meanwhile, the front end of each sliding resistance groove is electrically connected with the corresponding voltage test pin Pi of the controller. The high level of the controller is electrically connected with the rear cover.

[0009] The front end of the sliding resistance groove corresponding to the middle shell is electrically connected to the ground line of the controller through a resistance, and the voltage test pin P of the controller i The front end of the sliding resistance groove corresponding to the middle shell is electrically connected to the resistance R1, and the voltage at both ends of the resistance R1 is 5V when the brush is located at the front end of the sliding resistance groove corresponding to the middle shell in the initial position. Therefore, the voltage value of the voltage test pin P of the controller is 5V. i The measured voltage value is +5V. When the plug gauge body moves backward and drives the brush to move backward along the sliding resistance groove, the sliding resistance groove R2 is connected in the circuit and divides the +5V high level, so that the voltage value of the voltage test pin of the controller is reduced. The retracted distance of the plug gauge can be deduced by measuring the voltage value.

[0010] Preferably, a spring plunger is further fixedly connected to the wing plate, the length of the spring plunger is distributed along the length direction of the plug gauge body, a compression spring is sleeved outside the spring plunger, a conductive guide hole is arranged on the rear cover and distributed in front and back, the spring plunger is made of conductive material, and the spring plunger is slidably connected with the guide hole.

[0011] Preferably, in the initial state, the brush is located at the front end of the sliding resistance groove, and the compression spring is in a completely compressed state.

[0012] Preferably, in the initial state, the length of the plug gauge body exposed from the front end of the front cover is greater than the depth of the measured brake clearance of the vehicle axle.

[0013] Preferably, in the stacked state of the plurality of plug gauge bodies, the plurality of wing plates are distributed at equal angles within a range of 90° on the left and right sides of the plug gauge body.

[0014] The plug gauge body is inserted into the gap to be measured, the number of brushes kept in the initial position in the sliding resistance groove of the middle shell is detected by the controller, that is, the number of plug gauges that completely pass through the measured gap, and the thickness of a single plug gauge is multiplied by the thickness of a single plug gauge to obtain the minimum value of the brake clearance in the entire depth range of the measured brake clearance of the vehicle axle. At the same time, the position of the minimum value of the brake clearance can be determined according to the depth position information of the plug gauge, thereby solving the problems that the ordinary plug gauge needs to be measured and calculated multiple times, and the depth of the position of the minimum value of the gap can be obtained only by cooperation of the plug gauge and the ruler, and the accuracy is not high. The efficiency of the offline detection is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present application

[0016] Figure 2 It is an exploded schematic diagram of the structure of the present application

[0017] Figure 3 It is a schematic diagram of the rear cover structure

[0018] Figure 4 is a schematic view of the middle shell structure

[0019] Figure 5 is a schematic view of the controller circuit connection

[0020] Wherein: 1-front cover, 2-front shell, 3-middle shell, 4-rear shell, 5-rear cover, 6-gauge body, 7-wing plate, 8-brush, 9-spring strut, 10-compression spring, 11-guide hole, 12-square sliding slot, 13-controller, 14-sliding resistance slot, R1-first resistance, R2-sliding resistance. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0022] In the description of the invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the invention.

[0023] As shown in the device for quickly detecting the clearance of heavy truck axle brakes, comprising a sliding shell, ten sets of gauge bodies 6, a controller 13. Figures 1-5 The sliding shell is composed of a front cover 1, a front shell 2, a middle shell 3, a rear shell 4 and a rear cover 5 connected in sequence from front to back, the front cover 1 and the rear cover 5 are provided with square sliding slots 12 for the ten sets of gauge bodies 6 to pass through at the lower ends, the front shell 2, the middle shell 3 and the rear shell 4 are all shell structures distributed from front to back, the inner walls of the front shell 2 and the rear shell 4 are each provided with ten sets of semicircular sliding slots distributed along the front-to-back direction on the left and right sides, the inner walls of the middle shell 3 are also each provided with ten sets of sliding resistance slots 14 distributed along the front-to-back direction on the left and right sides, the inner walls of the sliding resistance slots 14 are coated with a resistance material, the semicircular sliding slots on the front shell 2 and the rear shell 4 and the sliding resistance slots 14 on the middle shell 3 are distributed one-to-one and communicate with each other, in addition, the rear cover 5 is also provided with guide holes 11 distributed at equal angles and penetrating from front to back on the left and right sides, the front cover 1, the front shell 2, the middle shell 3 and the rear shell 4 are all made of insulating material, and the rear cover 5 is made of conductive material.

[0024]

[0025] ​Ten groups of the thickness of the plug gauge body 6 are the same, the upper middle part of the plug gauge body 6 is symmetrically fixedly connected with the wing plate 7 on the left and right sides, the upper end of the wing plate 7 is fixedly connected with the brush 8, the rear of the brush 8 is fixedly connected with the spring plunger 9, the length of the spring plunger 9 is distributed along the length direction parallel to the plug gauge body 6, and the outer side of the spring plunger 9 is coaxially sleeved with the compression spring 10, one end of the compression spring 10 is in contact with the brush 8, and the other end is in contact with the front end face of the rear cover 5, the angle between the wing plate 7 on each group of the plug gauge body 6 and the plug gauge body 6 is different, and after the ten groups of the plug gauge body 6 are stacked from top to bottom, the wing plates 7 on the left and right sides are evenly distributed at equal angles within the range of 90°, the wing plate 7, the brush 8, the spring plunger 9 and the compression spring 10 are all conductive materials, and under the stacking state of the ten groups of the plug gauge body 6, the wing plate 7 and the brush 8 are correspondingly distributed with the sliding resistance groove 14 and the semicircular sliding groove 12, and can slide along the length direction of the semicircular sliding groove 12 and the sliding resistance groove 14.

[0026] The left and right sides of the middle shell 3 are each provided with 10 sliding resistance grooves 14, the front end of each sliding resistance groove 14 is electrically connected with the 0V ground line of the controller 13 through a 4KΩ first resistor R1, the resistance in the sliding resistance groove 14 is a sliding resistance R2, the front end of each sliding resistance groove 14 is connected with the corresponding voltage test pin Pi of the controller 13 through a wire, and the initial position of the brush 8 on the wing plate 7 is at the front end of the corresponding sliding resistance groove 14 in the middle shell 3, and the brush 8 is electrically connected with the +5V high level of the controller 13 through the spring plunger 9, the compression spring 10 and the rear cover 5.

[0027] When the plug gauge body 6 completely passes through the measured gap without moving backward, the brush 8 is at the initial position, i.e. the front end of the sliding resistance groove 14, at this time, the voltage of the corresponding test pin P i is +5V high level.

[0028] When the plug gauge body 6 does not completely pass through the measured gap and moves backward, the corresponding brush 8 moves backward in the sliding resistance groove 14 at the same time, at this time, there is no longer only one resistor R1 in the circuit, but the fixed resistance R1 and the variable resistance R2 of the sliding resistance groove 14 are connected in series to form a voltage dividing circuit, with the gradual backward movement of the brush 8, the variable resistance R2 of the sliding resistance groove 14 gradually increases, and the voltage of the voltage test pin P i of the controller 13 gradually decreases, so the voltage value of the voltage test pin P i measured by the controller 13 can be inversely deduced to the distance Li of the backward movement of the plug gauge body, and then the gap depth LDi at the top of the plug gauge body 6 is calculated by the formula LDi=L-Li, wherein L is the length of the plug gauge body 6 exposed to the front cover 1.

[0029] The controller 13 detects the number of plug gauges 6 completely passing through the measured gap, and then multiplies the thickness of a single plug gauge 6 to obtain the minimum value of the measured gap. Since the plug gauge 6 blocked by the minimum value position of the measured gap is the last blocked plug gauge 6, the distance Li of the plug gauge 6 moving backward is the smallest among the blocked plug gauges 6, and thus the gap depth LDi of the top of the plug gauge 6 is the depth position of the minimum value of the measured gap.

[0030] In the embodiment, the length of the front shell 2 is equal to the radius of the wing plate 7, which ensures that the corresponding brush 8 is at the front end of the sliding resistance groove 14 of the middle shell 3 when the plug gauge 6 is not blocked by the gap and moves backward. The length of the rear shell 4 is equal to the limit length of the compressed spring 10 after compression, which ensures that the corresponding brush 8 will not enter the groove of the rear shell 4 during the backward movement of the plug gauge 6.

[0031] The range of the quick detection device can be tested between the thickness of a single plug gauge 6 and the thickness of all plug gauges 6, and the minimum measurement accuracy is the thickness of a single plug gauge 6. The depth of the measured gap needs to be smaller than the length L of the plug gauge 6 exposed to the front cover 1, and the part of the plug gauge 6 exposed to the front cover 1 needs to be completely inserted into the measured gap during measurement, so as to ensure the accuracy of the width and minimum gap depth position data of the measured gap.

[0032] The working principle of the device is as follows:

[0033] In the initial state of the device, ten groups of plug gauges 6 are stacked from top to bottom, the wing plate 7 is located in the front shell 2, the length of the front end of the plug gauge 6 exposed to the front cover 1 is L, and the brush 8 is at the front end position of the sliding resistance groove 14 on the middle shell 3.

[0034] When the plug gauge 6 completely passes through the measured gap, since it is not blocked by the measured gap, the plug gauge 6 does not move backward, and the corresponding brush 8 is still at the initial position of the sliding resistance groove 14 of the middle shell 3. At this time, the controller 13 tests the voltage of the voltage test pin P i directly connected to the brush 8 is +5V high level.

[0035] If the plug gauge 6 is blocked at a position with a depth of L Di from the end surface of the front cover 1 and does not completely pass through, the plug gauge 6 moves backward by a distance of L i , and the corresponding brush 8 also moves backward by a distance of L i inside the corresponding sliding resistance groove 14 of the middle shell 3. At this time, the voltage of the voltage test pin Pi position is no longer +5V high level directly connected to the brush 8, and the voltage value of this position changes from originally only the resistance R1 occupying +5V high level to the resistance R2 between the brush 8 and the P i connection point and the resistance R1 sharing the +5V high level.

[0036] According to Ohm's law, the brush 8 moves backward a distance L. i The corresponding voltage test pin P i voltage value U Pi Determined by the following formula:

[0037] U Pi =IR1=[5 / (R1+R2)]R1=[5 / (R1+ρL i / S)]R1

[0038] In the formula, I is the current in the series circuit where R1 and R2 are connected in series, ρ is the resistivity of the sliding resistor R2, S is the cross-sectional area of ​​the sliding resistor R2, and L is the length of the feeler gauge body 6 protruding from the front cover 1. i The length of the sliding resistor R2 in series is given by the formula, except for U. Pi and L i Apart from the variable, all others are constants, therefore U can be measured using controller 13. Pi To calculate L i Therefore, from formula L Di =LL i Calculate the distance L between the head of the feeler gauge body 6 and the end face of the front cover 1. Di .

[0039] If the voltage value of the voltage test pin Pi corresponding to the feeler gauge body 6 of the controller 13 is found to be lower than +5V high level, it can be determined that the feeler gauge body 6 of the channel is blocked at a certain depth of the gap being measured and does not pass through the gap being measured. The controller 13 multiplies the number of feeler gauge bodies 6 that have completely passed through the gap being measured by the thickness of a single feeler gauge to obtain the minimum value of the brake clearance of the axle being measured.

[0040] When the 10-layer feeler gauge body 6 passes through the brake gap of the axle being tested, the feeler gauge body 6 that is blocked by the minimum gap position is the last feeler gauge body 6 to be blocked, that is, the feeler gauge body 6 moves backward a distance L. i It is the smallest of the blocked feeler gauge bodies 6, therefore the gap depth L at the top of the feeler gauge body 6 is... Di This refers to the depth location where the minimum value of the measured gap is located.

[0041] The controller 13 is connected to a display device, which can display the measured minimum gap and the depth L of the minimum gap from the outer end face of the front cover 1. Di The results are output to the display device.

[0042] Of course, the gap value at the location of other feeler gauge bodies 6 can also be obtained by multiplying the number of feeler gauges at the location of other feeler gauge bodies 6 by the thickness of a single feeler gauge body 6, and the depth and gap value at the location can be output to the display device to obtain the gap value of the braking gap at different depths.

[0043] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements without departing from the principles of the present application, and these improvements should also be considered as falling within the protection scope of the present application.

Claims

1. A rapid detection device for brake clearance of heavy-duty vehicle axles, characterized in that, include: The feeler gauge body is provided in multiple sets. Symmetrically distributed wing plates are provided on the left and right sides of the feeler gauge body. Brushes are fixedly connected to the wing plates. The angle between the wing plates and the feeler gauge body is different for each set of feeler gauge bodies. Multiple sets of feeler gauge bodies are stacked. The sliding housing is composed of a front cover, a middle housing, a rear housing, and a rear cover connected in sequence. The lower ends of the front cover and the rear cover are provided with square sliding grooves for multiple sets of feeler gauge bodies to pass through. The inner walls of the front housing and the middle housing are provided with correspondingly distributed semi-circular grooves. The inner wall of the middle housing is provided with sliding resistance grooves coated with resistive material. The semi-circular grooves and sliding resistance grooves are correspondingly distributed. In addition, a compression spring is provided between the wing plate and the rear cover. When multiple sets of feeler gauge bodies are stacked, multiple brushes are correspondingly distributed with the semi-circular grooves and sliding resistance grooves and can slide along the length direction of the semi-circular grooves and sliding resistance grooves. The front cover, front housing, middle housing, and rear housing are all made of insulating materials, while the feeler gauge body, wing plate, rear cover, compression spring, and brush are all made of conductive materials. The controller has its front end of each sliding resistor groove in the middle housing electrically connected to the controller's grounding wire through a first resistor. At the same time, the front end of each sliding resistor groove is electrically connected to the corresponding voltage test pin Pi of the controller. The controller's high level is electrically connected to the back cover. In the initial state, the brush is located at the front end of the sliding resistor groove. When the compression spring is fully compressed, the brush is located inside the sliding resistor groove.

2. The rapid detection device for brake clearance of heavy-duty vehicle axles according to claim 1, characterized in that, A spring tappet is also fixedly connected to the wing plate. The length of the spring tappet is distributed along the length direction of the feeler gauge body. A compression spring is sleeved on the outside of the spring tappet. Conductive guide holes are provided on the rear cover. The spring tappet is made of conductive material and is slidably connected to the guide holes.

3. The rapid detection device for brake clearance of heavy-duty vehicle axles according to claim 1, characterized in that, In the initial state, the length of the feeler gauge body protruding from the front end of the front cover is greater than the depth of the brake clearance of the axle being measured.

4. The rapid detection device for brake clearance of heavy-duty vehicle axles according to claim 1, characterized in that, When multiple feeler gauge bodies are stacked, multiple wing plates are evenly distributed within a 90° range on the left and right sides of the feeler gauge body.

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