A signal disc error-proof detection system and a detection method

Abstract

The present application relates to a kind of signal disc error-proof detection system and detection method, detection system includes the positioning disc and detection disc of relative arrangement, positioning disc and detection disc are all rotationally arranged, and axis is consistent, positioning disc and detection disc are equipped with bracket between, bracket is used to place the camshaft to be detected;The axis of positioning disc and detection disc is provided with through-hole, retractable conical center pin is arranged in through-hole, conical center pin is used to cooperate with the inner hole of camshaft;The end surface of positioning disc is equipped with positioning pin, positioning pin is used to cooperate with the positioning hole of camshaft, the end surface of detection disc is equipped with profiling groove, profiling groove is used to cooperate with the signal disc of camshaft;Positioning disc is driven connected with first motor, and detection disc is driven connected with second motor;The detection system of the present application can realize the on-line continuous detection of camshaft signal disc installation precision, improve detection efficiency, realize camshaft full detection, reduce camshaft defective rate.

Description

Technical Field

[0001] This invention belongs to the field of camshaft manufacturing technology, specifically relating to a signal disc error prevention detection system and detection method. Background Technology

[0002] The installation accuracy of the camshaft signal disc plays a crucial role in the safe operation of the engine. Generally, the angular accuracy of the signal disc is required to be no greater than ±0.5°. The installation accuracy of the signal disc is usually checked using a coordinate measuring machine (CMM) to measure the angular relationship between the locating hole at one end of the camshaft and the signal disc at the other end. However, this method is inefficient. For example, on a production line with an annual output of 5 million camshafts, the CMM method can only perform random sampling.

[0003] Patent 201410567901.9 discloses a camshaft signal disk angle detection fixture. When detecting the angle of the camshaft signal disk, the fixture requires manually fixing the camshaft to the bracket. During fixing, the reference hole (positioning hole) at the rear end of the camshaft needs to be manually aligned with the angle positioning pin to achieve positioning.

[0004] Therefore, this inspection tool must be operated manually and cannot be integrated with the production line to achieve automatic inspection, thus limiting the improvement in inspection efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention first provides a signal disk error prevention and detection system, the specific solution of which is as follows:

[0006] A signal disk error-proofing detection system includes a positioning disk and a detection disk arranged opposite each other. Both the positioning disk and the detection disk are rotatable and have the same axis. A bracket is provided between the positioning disk and the detection disk to hold the camshaft to be detected. A through hole is provided at the axis of the positioning disk and the detection disk, and a retractable tapered pin is provided in the through hole to cooperate with the inner hole of the camshaft. A positioning pin is provided on the end face of the positioning disk to cooperate with the positioning hole of the camshaft. A contour groove is provided on the end face of the detection disk to cooperate with the signal disk of the camshaft. The positioning disk is driven by a first motor, and the detection disk is driven by a second motor. The structure of both the positioning disk and the detection disk includes a turntable and a base. The turntable and the base are slidably connected, and a return spring is provided between the turntable and the base. The positioning pin and the contour groove are both provided on the base.

[0007] The positioning plate and the detection plate are rotatably mounted on the base, which is mounted on the slide rail. The slide rail is perpendicular to the camshaft conveyor line, and the base is driven by the second cylinder.

[0008] The positioning pin is equipped with a first pressure sensor, which is used to control the first motor. The contour groove is equipped with a second pressure sensor, which is used to control the second motor.

[0009] Furthermore, the conical ejector pin is driven by a first cylinder.

[0010] Furthermore, both the first and second motors are servo motors.

[0011] Furthermore, the turntable and the base are slidably connected by ball bearing guides.

[0012] Furthermore, the base is set on both sides of the camshaft conveyor line, and the bracket is set on the camshaft conveyor line; the base is equipped with a crossbeam, and the crossbeam is equipped with a photoelectric switch, which is used to sense the position of the camshaft and control the camshaft conveyor line.

[0013] A signal disk error prevention detection method, which uses a signal disk error prevention detection system of the present invention, includes the following steps:

[0014] 61) Place the camshaft to be tested on the bracket, with the side of the assembly signal disk facing the detection disk. Start the second cylinder, push the base into place, and the positioning disk and detection disk contact the end of the camshaft, causing the reset spring to deform.

[0015] 62) The first cylinder starts, and the conical ejector pin presses against the camshaft;

[0016] 63) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angles of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate;

[0017] 64) After the test is completed, the first cylinder resets and the conical pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset.

[0018] A signal disk error prevention detection system, which is another signal disk error prevention detection system using the present invention, includes the following steps:

[0019] 71) Place the camshaft to be tested on the bracket of the camshaft conveyor line, with the side of the assembly signal disk facing the detection disk. Start the camshaft conveyor line. When the photoelectric switch senses the signal, the camshaft conveyor line stops.

[0020] 72) The second cylinder starts, the base moves into place, the positioning plate and the detection plate contact the end of the camshaft, and the reset spring deforms;

[0021] 73) The first cylinder starts, and the conical ejector pin presses against the camshaft;

[0022] 74) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angle of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate.

[0023] 75) After the test is completed, the first cylinder resets and the conical ejector pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset.

[0024] 76) Start the camshaft conveyor line.

[0025] Furthermore, in step 74), when the detection disk rotates 360° and the second pressure sensor does not detect a signal, it is determined that the signal disk is installed backwards.

[0026] The detection system of this invention can be used on an assembly line to realize online continuous detection of the installation accuracy of the camshaft signal disc, improve detection efficiency, achieve full inspection of the camshaft, and reduce the defect rate of the camshaft. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the signal disk.

[0028] Figure 2 A photo of the actual tooling used to prevent errors.

[0029] Figure 3 This is a schematic diagram of the detection system in Example 1.

[0030] Figure 4 This is a right-side view of the positioning disk in Example 1.

[0031] Figure 5 This is a front view schematic diagram of the positioning disk in Example 1.

[0032] Figure 6 This is a schematic diagram of the detection system in Example 2. Detailed Implementation

[0033] The present invention will now be clearly described in conjunction with specific embodiments. This description is merely illustrative and is not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or improvements made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the scope of protection of the present invention.

[0034] Example

[0035] Example 1

[0036] The assembly angle of the camshaft signal disc is a crucial characteristic required by customers; deviations beyond this tolerance can affect engine ignition timing. Prior to this invention, the angle difference of the signal disc was detected using a coordinate measuring machine, which was inefficient. With an annual production of 5 million camshafts, only random sampling was possible, not full inspection, leading to the easy leakage of defective products.

[0037] The outline of the camshaft signal disk is as follows: Figure 1 As shown, the device includes four protruding teeth of different sizes and exhibits asymmetrical characteristics. During the pressing and mounting of the signal disk, issues such as angular errors and reverse mounting of the signal disk may occur. The inventors first designed a fault-prevention tooling with a contour groove, as shown in the image. Figure 2 As shown, the contour of the contour groove matches the contour of the signal disk. The end of the camshaft with the signal disk is aligned with the error-proofing fixture at a fixed angle. If the signal disk falls into the contour groove of the error-proofing fixture, the angle difference of the signal disk is acceptable; if the signal disk cannot fall into the contour groove of the error-proofing fixture, the angle of the signal disk is out of tolerance or installed backwards, and it is unacceptable. This method is still inefficient and cannot accurately measure the magnitude of the angle difference, which is not conducive to the quantitative control of the quality of the signal disk pressing process.

[0038] Based on this, a signal disk error prevention detection system was further designed, such as... Figures 3-5 Two sliding bases 2 are mounted on a slide rail 1, positioned opposite each other. A second cylinder 3 connected to the bases pushes the bases to slide along the slide rail. A limit block at the front of the slide rail controls the travel of the bases. A bracket 4 for placing a camshaft is positioned between the bases. The top of the bracket has a V-groove, in which the camshaft 5 can be placed laterally. A positioning plate 6 is mounted on one base, and a detection plate 7 is mounted on the other. Both the positioning plate and the detection plate are rotatable and have the same axis. A through hole is provided at the axis of the positioning plate and the detection plate, and a retractable conical ejector pin 8 is installed inside the through hole. The conical ejector pin is driven by a first cylinder 9 fixed to the base and is used to mate with the inner hole of the camshaft. When the conical ejector pin extends, it can center and tighten the camshaft.

[0039] The end face of the positioning plate is provided with a positioning pin 10, which is used to mate with the positioning hole of the camshaft. The end face of the detection plate is provided with a contour groove, which can be referenced. Figure 2 The contoured groove is used to mate with the signal disk of the camshaft; the positioning disk 6 is driven by a first motor 11, and the detection disk 7 is driven by a second motor 12. The positioning pin is equipped with a first pressure sensor, which controls the first motor; the contoured groove is equipped with a second pressure sensor, which controls the second motor. Both the first and second motors are servo motors. The servo motors can precisely control and record the rotation angle, and the rotation angles of the positioning disk and the detection disk are obtained through the transmission ratio of the gear set.

[0040] Both the positioning plate and the detection plate include a turntable 13 and a base 14. The turntable and the base are slidably connected, and a return spring 15 is provided between the turntable and the base. The positioning pin and the contour groove are both provided on the base. The turntable and the base are slidably connected by a ball guide rail 16. The ball guide rail is a type of rolling guide rail, which can improve the accuracy of the linear movement of the base compared to ordinary slide rails.

[0041] On the base of the inspection disc, a tooling with a contoured groove is detachably connected to the base using bolts. The tooling structure can be referenced. Figure 2 Different tooling can be used to produce different models of camshafts.

[0042] The signal disk error prevention detection system in this embodiment performs the following steps when detecting the installation accuracy of the camshaft signal disk:

[0043] 1) Place the camshaft 5 to be tested on the bracket, with one side of the assembly signal disk 17 facing the detection disk. Start the second cylinder, push the base into place, and the positioning disk and detection disk contact the end of the camshaft, causing the reset spring to deform.

[0044] 2) The first cylinder starts, and the conical ejector pin presses against the camshaft;

[0045] 3) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angle of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate;

[0046] 4) After the test is completed, the first cylinder resets and the conical pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset.

[0047] Example 2

[0048] Based on Example 1, the detection system in this example is integrated with a continuous camshaft production line to achieve online continuous detection of the installation accuracy of the camshaft signal disc. For example... Figure 6 In this embodiment, the base is set on both sides of the camshaft conveyor line, the bracket 4 is set on the camshaft conveyor line, the conveyor line is a chain conveyor 18, and the bracket with V-groove is connected to the chain conveyor; the base is provided with a crossbeam 19, and the crossbeam is provided with a photoelectric switch 20. The photoelectric switch is used to sense the position of the camshaft and control the camshaft conveyor line.

[0049] The detection system in this embodiment performs the following steps when detecting the installation accuracy of the camshaft signal disc:

[0050] 1) Place the camshaft to be tested on the bracket of the camshaft conveyor line, with the side of the assembly signal disk facing the detection disk. Start the camshaft conveyor line. When the photoelectric switch senses the signal, the camshaft conveyor line stops.

[0051] 2) The second cylinder starts, the base moves into place, the positioning plate and the detection plate contact the end of the camshaft, and the reset spring deforms;

[0052] 3) The first cylinder starts, and the conical ejector pin presses against the camshaft;

[0053] 4) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angle of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate;

[0054] 5) After the test is completed, the first cylinder resets and the conical ejector pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset.

[0055] 6) The camshaft conveyor line restarts, and the above steps are repeated after the next camshaft is delivered.

[0056] In addition to angle errors causing defects during signal disc pressing, reversed signal disc installation can also lead to defects. Therefore, during the testing process, the signal disc may not fall into the contour groove when the testing disc rotates. To address this, in step 4), if the second pressure sensor does not detect a signal when the testing disc rotates 360°, the signal disc is determined to be reversed.

[0057] In this embodiment, the detection system can be linked with a program-controlled robotic arm to select out defective camshafts downstream of the conveyor line. Alternatively, the detection system can be linked with an automatic marking system to mark the detection results on the corresponding camshafts, and the process control of the signal disc pressing step can be adjusted based on the feedback of the results.

[0058] Through testing, this system can accurately measure the signal disc angle difference of 6-10 camshafts within 1 minute, meeting the requirements for full inspection of camshafts.

Claims

1. A signal disk error prevention detection system, characterized in that: The device includes a positioning plate and a detection plate arranged opposite each other, both of which are rotatable and aligned on the same axis. A bracket is provided between the positioning plate and the detection plate to hold the camshaft to be tested. A through hole is provided at the axis of both the positioning plate and the detection plate, and a retractable tapered pin is installed within the through hole to engage with the inner hole of the camshaft. A positioning pin is provided on the end face of the positioning plate to engage with the positioning hole of the camshaft, and a contour groove is provided on the end face of the detection plate to engage with the signal plate of the camshaft. A first motor is driven to the positioning plate, and a second motor is driven to the detection plate. Both the positioning plate and the detection plate include a turntable and a base, which are slidably connected. A return spring is provided between the turntable and the base, and the positioning pin and the contour groove are both located on the base. The positioning plate and the detection plate are rotatably mounted on the base, which is mounted on the slide rail. The slide rail is perpendicular to the camshaft conveyor line, and the base is driven by the second cylinder. The positioning pin is equipped with a first pressure sensor, which is used to control the first motor. The contour groove is equipped with a second pressure sensor, which is used to control the second motor.

2. The signal disk error prevention and detection system according to claim 1, characterized in that: The conical ejector pin is driven by a first cylinder.

3. The signal disk error prevention detection system according to claim 2, characterized in that: Both the first and second motors are servo motors.

4. The signal disk error prevention and detection system according to claim 3, characterized in that: The turntable and the base are slidably connected by ball bearing guides.

5. The signal disk error prevention and detection system according to claim 4, characterized in that: The base is set on both sides of the camshaft conveyor line, and the bracket is set on the camshaft conveyor line; the base is equipped with a crossbeam, and the crossbeam is equipped with a photoelectric switch, which is used to sense the position of the camshaft and control the camshaft conveyor line.

6. A signal disk error prevention detection method, characterized in that: It uses the signal disk error prevention detection system as described in claim 4, and includes the following steps: 61) Place the camshaft to be tested on the bracket, with the side of the assembly signal disk facing the detection disk. Start the second cylinder, push the base into place, and the positioning disk and detection disk contact the end of the camshaft, causing the reset spring to deform. 62) The first cylinder starts, and the conical ejector pin presses against the camshaft; 63) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angles of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate; 64) After the test is completed, the first cylinder resets and the conical pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset.

7. A signal disk error-proofing detection method, characterized in that: It uses the signal disk error prevention detection system as described in claim 5, and includes the following steps: 71) Place the camshaft to be tested on the bracket of the camshaft conveyor line, with the side of the assembly signal disk facing the detection disk. Start the camshaft conveyor line. When the photoelectric switch senses the signal, the camshaft conveyor line stops. 72) The second cylinder starts, the base moves into place, the positioning plate and the detection plate contact the end of the camshaft, and the reset spring deforms; 73) The first cylinder starts, and the conical ejector pin presses against the camshaft; 74) The first motor starts, the positioning plate rotates, and when the positioning pin falls into the positioning hole at the end of the camshaft, the first pressure sensor senses the signal and the first motor stops; the second motor starts, the detection plate rotates, and when the camshaft signal plate falls into the contour groove, the second pressure sensor senses the signal and the second motor stops; record the rotation angles of the positioning plate and the detection plate, and the difference between the two is the angle difference of the signal plate. 75) After the test is completed, the first cylinder resets and the conical ejector pin is released; the second cylinder resets and the base moves backward; the first motor and the second motor start, and the positioning plate and the detection plate reset. 76) Camshaft conveyor line starts.

8. The signal disk error prevention detection method according to claim 7, characterized in that: In step 74), when the detection disk rotates 360° and the second pressure sensor does not detect a signal, it is determined that the signal disk is installed backwards.

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