Signal tooth detection machine and detection method

Abstract

The invention discloses a signal tooth detection machine and a detection method, and relates to the technical field of online automatic detection, and the signal tooth detection machine comprises a frame, a pressing mechanism, a positioning mechanism and a detection mechanism. The frame comprises a lower frame and an upper frame; the pressing mechanism is fixedly installed on the lower frame and comprises a pressing air cylinder and a pressing head. The positioning mechanism is located under the pressing head and installed on the lower frame. The positioning mechanism comprises a tensioning clamp and an elastic positioning pin. The detection mechanism is installed on the lower frame and located on the side face of the positioning mechanism, the detection mechanism comprises correlation sensors and a lifting sliding table, the multiple sets of correlation sensors are used, the upper portion, the middle portion and the lower portion of the teeth are measured respectively, the size of burrs can be detected according to the measurement results of the sensors, and the straight edge straightness of the signal teeth can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line automatic detection, and specifically relates to a signal tooth detector and a detection method. Background Art

[0002] In modern industrial manufacturing, signal teeth are applied in more and more occasions, especially in automobiles and automation equipment, and are widely used in engine timing ignition and position sensing, etc. Since signal teeth affect the position accuracy and ignition time, thus affecting the emission index, with the tightening of emission requirements, the indexing accuracy (angle accuracy and position accuracy) requirements for relevant signal teeth are also getting higher and higher. Affected by manufacturing accuracy and various fitting clearances, the cost of using existing general mechanical inspection tools is higher with the improvement of accuracy. At the same time, the existing mechanical inspection tools often rely on manual inspection, making it difficult to conduct 100% full inspection on dozens of teeth, resulting in low efficiency and prone to missed inspection and misjudgment. Using inspection tools such as coordinate measuring machines takes a long time and has a higher cost. Moreover, due to the high precision of signal teeth, they are often processed by cutting, stamping, milling, etc., which easily generates burrs on the edges of signal teeth, affecting the signal accuracy of signal tooth sensors. Once generated, due to the large number of teeth, it is difficult to identify and remove them in subsequent inspections.

[0003] To avoid these problems, it is often necessary to significantly improve the accuracy of equipment, tooling and comprehensive process capabilities in the production process, and investing in better equipment, more precise tooling, etc. requires a large amount of initial investment, high risks, and it is difficult to avoid the mixing of unqualified products caused by debugging and incorrect parameters.

[0004] Aiming at the deficiencies of the existing technology, the present invention aims to provide an automatic detector with automatic on-line signal tooth detection. Summary of the Invention

[0005] The purpose of the present invention is to provide a signal tooth detector and a detection method to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A signal tooth detector includes a frame, a pressing mechanism, a positioning mechanism, and a detection mechanism;

[0007] The frame includes a lower frame and an upper frame, and the upper frame is fixedly installed on the lower frame;

[0008] The pressing mechanism is fixedly installed on the lower frame, and the pressing mechanism includes a pressing cylinder and a pressing head, and the pressing head is fixedly installed at the end of the output shaft of the pressing cylinder;

[0009] The positioning mechanism is located directly below the pressing head and is installed on the lower frame. The positioning mechanism includes a tensioning fixture and an elastic positioning pin, and the tensioning fixture is used for fixedly installing on a flywheel;

[0010] The detection mechanism is installed on the lower frame and is located on the side of the positioning mechanism. The detection mechanism includes an opposed sensor and a lifting slide table. The opposed sensor is arranged on the lifting slide table and can be driven by the lifting slide table to move up and down.

[0011] Preferably, a display panel is provided on the upper frame.

[0012] Preferably, the pressing cylinder is fixedly installed on the support frame, and the support frame is fixedly installed on the lower frame.

[0013] Preferably, the tensioning clamp is installed on the wear-resistant pad through an elastic positioning pin. The wear-resistant pad is fixedly installed on the bearing seat. The bearing seat is installed on the mounting bracket, and the mounting bracket is installed on the lower frame. A main shaft is provided inside the tensioning clamp. The tensioning clamp will generate expansion and contraction changes when the main shaft moves up and down. An optical encoder is provided below the bearing seat.

[0014] Preferably, a cylinder is installed at the bottom of the mounting bracket. The output shaft of the cylinder passes through the synchronous pulley set. The top of the synchronous pulley set is connected to the bearing seat and the side is connected to the output shaft of the rotary motor. The rotary motor is installed inside the lower frame. The main shaft is connected to the main shaft. An optical encoder is provided below the synchronous pulley set.

[0015] Preferably, several groups of opposed sensors are provided and are all fixedly installed inside the sensor bracket. The sensor bracket is installed on the slider of the lifting slide table. The slider of the lifting slide table is connected to the output shaft of the detection cylinder. The lifting slide table is connected to the transverse slide table through a connecting plate.

[0016] A method for detecting the signal teeth of a flywheel includes the following steps:

[0017] S1. Set parameters: Set the number of teeth of the workpiece to be inspected, the angular tolerance or positional tolerance of each tooth, and the angular tolerance or positional tolerance between the tooth and the positioning pin; Set the various results to be displayed;

[0018] S2. Load the workpiece;

[0019] S3. Preparation action: Give a signal to start measurement. The signal is sent to the industrial control computer to control the PLC to output an action signal, and control the following steps:

[0020] a. The cylinder pulls down, tightens the tensioning clamp downward to expand, and tightens the center hole of the workpiece;

[0021] b. The cylinder pulls down, and makes the reference surface of the workpiece closely adhere to the bearing seat downward;

[0022] c. The detection cylinder acts, the lifting slide table descends, and the opposed sensor is in place;

[0023] d. After the above three are in place, the rotating motor rotates to drive the workpiece to rotate;

[0024] S4. Measurement: With the workpiece rotating, the opposed sensors start to measure all tooth parameters;

[0025] After rotating a complete circle, stop;

[0026] Calculation: Input the measurement data into the industrial control computer and perform relevant calculations according to the requirements of the preset parameters;

[0027] Display: Display the calculation results on the monitor;

[0028] S5. Reset: The industrial control computer controls the PLC to output an action signal to control the following steps:

[0029] e. The rotating motor stops rotating, driving the workpiece to stop rotating;

[0030] f. The output shaft of the cylinder drives the main shaft to move upward, and the tensioning fixture contracts to release the workpiece;

[0031] g. The tensioning fixture contracts to release the workpiece, and the reference surface of the workpiece disengages from the bearing seat;

[0032] h. Detect the cylinder action, the lifting slide rises, and the opposed sensors leave the measurement position;

[0033] S6. Repeat measurement: Repeat steps S4 and S5.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. The present invention uses multiple groups of opposed sensors to measure the upper, middle, and lower parts of the teeth respectively. According to the measurement results of the sensors, the size of the burrs can be detected, and the straightness of the straight edge of the signal teeth can be controlled;

[0036] 2. The present invention can program the measurement and display of related specific tooth items, etc., and can adapt to the automatic detection and screening of items such as the circumferential full tooth angle, position degree, burrs, etc. of similar products. It has the characteristics of fast detection beat and high accuracy, and can be widely used in the self-inspection of components related to rotary signal teeth, greatly improving production efficiency and avoiding product quality risks. Description of the Drawings

[0037] Figure 1 It is the front view of the present invention;

[0038] Figure 2 It is the side view of the present invention;

[0039] Figure 3 It is the diagram of the positioning mechanism and detection mechanism of the present invention;

[0040] Figure 4It is a flow chart of the detection method.

[0041] In the figure: 1 - frame; 11 - lower frame; 12 - upper frame;

[0042] 2 - pressing mechanism; 21 - pressing cylinder; 22 - pressing head; 23 - support frame;

[0043] 3 - positioning mechanism; 31 - tensioning fixture; 32 - elastic positioning pin; 33 - wear-resistant pad; 34 - bearing seat; 35 - mounting bracket; 36 - cylinder; 37 - synchronous pulley set; 38 - rotating motor; 311 - main shaft;

[0044] 4 - detection mechanism; 41 - opposed sensor; 42 - lifting slide; 43 - sensor bracket; 44 - detection cylinder; 45 - connecting plate; 46 - transverse slide. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Please refer to Figures 1 to 4 , the present invention provides a technical solution: a signal tooth detector, including a frame 1, a pressing mechanism 2, a positioning mechanism 3 and a detection mechanism 4;

[0047] The frame 1 includes a lower frame 11 and an upper frame 12, and the upper frame 12 is fixedly installed on the lower frame 11;

[0048] The pressing mechanism 2 is fixedly installed on the lower frame 11. The pressing mechanism 2 includes a pressing cylinder 21 and a pressing head 22, and the pressing head 22 is fixedly installed at the end of the output shaft of the pressing cylinder 21;

[0049] The positioning mechanism 3 is located directly below the pressing head 22 and is installed on the lower frame 11. The positioning mechanism 3 includes a tensioning fixture 31 and an elastic positioning pin 32, and the tensioning fixture 31 is used for fixedly installing on the flywheel;

[0050] The detection mechanism 4 is installed on the lower frame 11 and is located on the side of the positioning mechanism 3. The detection mechanism 4 includes an opposed sensor 41 and a lifting slide 42. The opposed sensor 41 is arranged on the lifting slide 42 and can be driven by the lifting slide 42 to move up and down.

[0051] In this embodiment, a display panel is provided on the upper frame 12 for displaying various information about the operation of the device.

[0052] In this embodiment, the pressing cylinder 21 is fixedly installed on the support frame 23, and the support frame 23 is fixedly installed on the lower frame 11. By pressing down the pressing cylinder 21, the position of the flywheel is fixed on the positioning mechanism 3, facilitating detection.

[0053] In this embodiment, the tensioning fixture 31 is installed on the wear-resistant pad 33 through the elastic positioning pin 32. The wear-resistant pad 33 is fixedly installed on the bearing seat 34. The bearing seat 34 is installed on the mounting frame 35, and the mounting frame 35 is installed on the lower frame 11. The tensioning fixture 31 is internally provided with a main shaft 311. When the main shaft 311 moves up and down, the tensioning fixture 31 will produce expansion and contraction changes. By moving the main shaft 311 up and down, the tensioning fixture 31 is driven to expand and contract, thereby realizing the clamping and loosening of the workpiece.

[0054] In this embodiment, a cylinder 36 is installed at the bottom of the mounting frame 35. The output shaft of the cylinder 36 passes through the synchronous pulley set 37. The top of the synchronous pulley set 37 is connected to the bearing seat 34 and the side is connected to the output shaft of the rotary motor 38. The rotary motor 38 is installed inside the lower frame 11. The main shaft 311 is connected to the main shaft 311. By the cylinder 36, the main shaft 311 can be driven to move up and down, and by the motor 38, the bearing seat 34 can be driven to rotate, thereby realizing the rotation of the flywheel workpiece.

[0055] In this embodiment, there are three groups of opposed sensors 41, and all are fixedly installed inside the sensor bracket 43. The sensor bracket 43 is installed on the slider of the lifting slide table 42. The slider of the lifting slide table 42 is connected to the output shaft of the detection cylinder 44. The lifting slide table 42 is connected to the transverse slide table 46 through the connecting plate 45. By the transverse slide table 46, the lifting slide table 42 can be driven to move left and right, and by the lifting slide table 42, the opposed sensor 41 can be driven to move up and down, facilitating the detection of the flywheel workpiece.

[0056] A method for detecting the signal teeth of a flywheel includes the following steps:

[0057] S1. Set parameters: Set the number of teeth of the workpiece to be inspected, the angular tolerance or positional tolerance of each tooth, and the angular tolerance or positional tolerance between the tooth and the positioning pin; Set the various results to be displayed;

[0058] S2. Load the workpiece;

[0059] S3. Preparation action: Give a signal to start measurement. The signal is sent to the industrial control computer to control the PLC to output an action signal, and control the following steps:

[0060] a. The cylinder 36 pulls down, and the tensioning fixture 31 is tightened downward to expand and tighten the center hole of the workpiece;

[0061] b. The cylinder 36 moves downward, pressing the reference surface of the workpiece tightly against the bearing block 34;

[0062] c. The detection cylinder 44 operates, the lifting slide 42 descends, and the opposed sensor 41 is in place;

[0063] d. After the above three are in place, the rotating motor 38 rotates, driving the workpiece to rotate;

[0064] S4. Measurement: The workpiece rotates, and the opposed sensor 41 starts to measure all tooth parameters;

[0065] After the rotation is completed for a full circle, stop;

[0066] Calculation: The measured data is input into the industrial control computer, and relevant calculations are performed according to the needs of the preset parameters;

[0067] Display: Display the calculation result on the display;

[0068] S5. Reset: The industrial control computer controls the PLC to output an action signal, and controls the following steps:

[0069] e. The rotating motor 38 stops rotating, driving the workpiece to stop rotating;

[0070] f. The output shaft of the cylinder 36 drives the main shaft 311 to move upward, and the tensioning fixture 31 contracts to release the workpiece;

[0071] g. The tensioning fixture 31 contracts to release the workpiece, and the reference surface of the workpiece disengages from the bearing block 34;

[0072] h. The detection cylinder 44 operates, the lifting slide 42 rises, and the opposed sensor 41 leaves the measurement position;

[0073] S6. Repeat measurement: Repeat steps S4 and S5.

[0074] Working principle

[0075] 1. The center hole of the workpiece is introduced along the tensioning fixture 31 until the workpiece is in contact with the wear-resistant pad, and the pressing cylinder 21 extends to drive the pressing head 22 to press the workpiece;

[0076] 2. The positions of the 3 groups of opposed sensors 41 are determined according to the first signal tooth position and the encoder angle at the signal tooth hole position to determine the detection position of the mounting surface sensor;

[0077] 3. The rotating motor 38 drives the workpiece to rotate. According to the on / off of the opposed sensor 41 and the photoelectric encoder below the main shaft, the angle of the workpiece is determined. According to the calibration piece, the angle of the 20th tooth is compared to determine whether the workpiece is qualified;

[0078] 4. The equipment determines whether the signal teeth are abnormal and whether there is any burr influence according to the detection values of the 3 groups of sensors.

[0079] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A signal tooth detection machine, characterized in that: It comprises a frame (1), a pressing mechanism (2), a positioning mechanism (3) and a detection mechanism (4); The frame (1) comprises a lower frame (11) and an upper frame (12), wherein the upper frame (12) is fixedly mounted on the lower frame (11); The clamping mechanism (2) is fixedly mounted on the lower frame (11), and the clamping mechanism (2) comprises a clamping cylinder (21) and a clamping head (22), and the clamping head (22) is fixedly mounted on the end of the output shaft of the clamping cylinder (21); The positioning mechanism (3) is located directly below the pressing head (22) and is mounted on the lower frame (11). The positioning mechanism (3) comprises a tensioning clamp (31) and an elastic positioning pin (32). The tensioning clamp (31) is used for being fixedly mounted on the flywheel. The detection mechanism (4) is installed on the lower frame (11) and is located on the side of the positioning mechanism (3). The detection mechanism (4) comprises a beam sensor (41) and a lifting slide (42). The beam sensor (41) is arranged on the lifting slide (42) and can be driven by the lifting slide (42) to move up and down.

2. A signal tooth detection machine according to claim 1, characterized in that: A display panel is provided on the upper frame (12).

3. A signal tooth detection machine according to claim 1, characterized in that: The pressing cylinder (21) is fixedly mounted on a support frame (23), and the support frame (23) is fixedly mounted on a lower frame (11).

4. A signal tooth detection machine according to claim 1, characterized in that: The tensioning clamp (31) is mounted on a wear-resistant pad (33) via an elastic positioning pin (32); the wear-resistant pad (33) is fixedly mounted on a bearing seat (34); the bearing seat (34) is mounted on a mounting frame (35); the mounting frame (35) is mounted on a lower frame (11); a main shaft (311) is provided inside the tensioning clamp (31); when the main shaft (311) moves up and down, the tensioning clamp (31) will expand and contract; and a photoelectric encoder is provided below the bearing seat (34).

5. A signal tooth detection machine according to claim 4, characterized in that: A cylinder (36) is installed at the bottom of the mounting frame (35), and the output shaft of the cylinder (36) passes through a synchronous pulley group (37). The top of the synchronous pulley group (37) is connected to a bearing seat (34) and the side is connected to the output shaft of a rotating motor (38). The rotating motor (38) is installed in the lower frame (11), and the main shaft (311) is connected to the main shaft (311). A photoelectric encoder is provided below the synchronous pulley group (37).

6. A signal tooth detection machine according to claim 1, characterized in that: The said beam sensors (41) are provided in several groups and are all fixedly mounted in a sensor bracket (43). The said sensor bracket (43) is mounted on a slider of a lifting slide (42). The slider of the lifting slide (42) is connected to an output shaft of a detection cylinder (44). The lifting slide (42) is connected to a transverse slide (46) via a connecting plate (45).

7. A method for detecting flywheel signal teeth using a signal tooth detection machine according to claims 1-6, characterized in that: The following steps are involved: S1. Set parameters: set the number of teeth of the workpiece to be inspected, the angle tolerance of each tooth or the position tolerance of each tooth, the angle tolerance or position tolerance between the tooth and the positioning pin; set the results to be displayed; S2. Load the workpiece; S3. Preparatory action: Give a signal to start measuring, and send the signal to the industrial computer to control the PLC to output the action signal, and control the following steps: a. The cylinder (36) is pulled down to tighten the tensioning fixture (31) downward to expand and tighten the center hole of the workpiece; b. The cylinder (36) pulls downward to make the reference surface of the workpiece close to the bearing seat (34); c. The detection cylinder (44) moves, the lifting slide (42) descends, and the corresponding sensor (41) is in place; d. After the above three are in place, the rotary motor (38) rotates, driving the workpiece to rotate; S4. Measurement: The workpiece rotates, and the beam sensor (41) starts measuring all tooth parameters; After completing a full rotation, stop; Calculation: The measured data is input into the industrial computer, and relevant calculations are performed according to the needs of the preset parameters; Display: Display the calculation results on the display; S5. Reset: The industrial computer controls the PLC to output an action signal and control the following steps: e. The rotating motor (38) stops rotating, driving the workpiece to stop rotating; f. The output shaft of the cylinder (36) drives the main shaft (311) to move upward, and the tensioning fixture (31) contracts to release the workpiece; g. The tensioning fixture (31) contracts and releases the workpiece, and the reference surface of the workpiece is separated from the bearing seat (34); h. The detection cylinder (44) is activated, the lifting slide (42) rises, and the beam sensor (41) leaves the measuring position; S6. Repeat measurement: Repeat steps S4 and S5.

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