Automatic detection device for assembled super-long camshaft

Abstract

The automatic detection device comprises a base, a horizontal detection table top is arranged on the top face of the base, a track A and a track B which are arranged along the X axis are installed on the detection table top, a rotary driving mechanism is fixedly installed at one end of the track A, a sliding seat A is installed on the track A, an ejector pin support is installed on the sliding seat A, and a sliding seat B is installed on the track B; a cam detection mechanism is installed on the sliding seat B, the sliding seat B is connected with a first linear driving mechanism, the cam detection mechanism and the first linear driving mechanism are both connected to an upper computer control system, at least one set of self-adaptive supporting mechanism is installed on the track A and located between the ejector pin support and the rotary driving mechanism, and the self-adaptive supporting mechanism comprises a sliding plate. The bottom of the sliding plate is slidably connected with the track A. The top of the sliding plate is provided with a sliding bracket, the top of the sliding bracket is provided with a plurality of rotating shafts, and the axes of the rotating shafts are arranged along the X axis. According to the invention, automatic detection of the assembled overlong camshaft is realized.

Description

Technical Field

[0001] The invention relates to the technical field of camshaft production, in particular to an automatic detection device for assembled extra-long camshafts. Background Art

[0002] The camshaft is an important component inside the engine or generator. Common camshafts are used in automobile engines and are generally short in length. However, the camshafts used in some large diesel generator sets can be up to 2-3 meters long. At present, some units use assembled camshafts, which are 2-3 camshafts of about 1 meter in length coaxially assembled to form an extra-long camshaft. The end faces of the camshafts are connected by flanges and bolts. The assembled camshafts also need to be inspected, mainly to detect the outer contours of each cam and the angle between the cam centerline and the positioning reference line. At present, there is no detection equipment suitable for extra-long camshafts in China. Traditional cam profile detection equipment clamps the two ends of the camshaft, drives the camshaft to rotate, and then contacts the cam through a probe. During the rotation of the cam, the probe drives the probe to extend and retract. The probe uploads the detection signal to the host computer system, and the host computer system automatically draws the contour line and center line of the cam based on the detection data. The probe can measure the angle between the cam centerline and the positioning reference line by finding the positioning reference line of the camshaft. However, traditional cam profile detection equipment cannot be applied to extra-long camshafts. The main problem is that the camshaft is too long, resulting in a certain degree of bending deflection in the middle part due to its own weight after being clamped at both ends. Some models of extra-long camshafts are also equipped with helical gears. The gear inspection mainly tests its runout, which is not possible with existing inspection equipment. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide an automatic detection device for an assembled extra-long camshaft.

[0004] The specific solution of the present invention is: an automatic detection device for assembled super-long camshafts, comprising a base, a horizontal detection table surface on the top surface of the base, a track A and a track B arranged along the X-axis, a rotary drive mechanism fixedly mounted on one end of track A, a slide A mounted on track A, a pin support mounted on slide A, a slide B mounted on track B, a cam detection mechanism mounted on slide B, slide B connected to a first linear drive mechanism, the cam detection mechanism and the first linear drive mechanism are both connected to a host computer control system, at least one set of adaptive support mechanisms is mounted on track A between the pin support and the rotary drive mechanism, the adaptive support mechanism comprises a slide, the bottom of the slide is slidably connected to track A, a sliding bracket is mounted on the top of the slide, a plurality of rotating shafts are mounted on the top of the sliding bracket, the axis of the rotating shaft is arranged along the X-axis, a roller bracket is placed on the top of the rotating shaft, and two rollers are symmetrically mounted on the top of the roller bracket.

[0005] Furthermore, a leveling bolt is installed between the sliding bracket and the slide plate. The leveling bolt is composed of a drawing wire and a top wire. The support height of the sliding bracket and the horizontality of the sliding bracket are adjusted by twisting the drawing wire and the top wire.

[0006] Furthermore, the detection table is also equipped with a track C arranged along the X-axis, a slide C is installed on the track C, the slide C is connected to a second linear drive mechanism, and a gear runout detection mechanism is installed on the top of the slide C. The gear runout detection mechanism is used to detect the processing accuracy of the gears on the camshaft. The second linear drive mechanism and the gear runout detection mechanism are both connected to the host computer control system signal.

[0007] Furthermore, the second linear drive mechanism includes a servo motor, the output end of the servo motor is equipped with a screw arranged along the X-axis direction, the screw is threadedly connected to the slide C, and the structure of the first linear drive mechanism is the same as that of the second linear drive mechanism.

[0008] Furthermore, the gear runout detection mechanism includes a guide rail arranged along the Y-axis direction, the guide rail is fixedly connected to the slide C, a sliding bracket is installed on the guide rail, a support shaft arranged along the Z-axis is installed on the end of the sliding bracket close to the camshaft, a replaceable standard gear is installed on the support shaft, a cylinder is installed at the other end of the sliding bracket, the cylinder body of the cylinder is fixedly connected to the slide C, a push plate is installed at the end of the piston rod of the cylinder, a compression spring is installed between the push plate and the sliding bracket, and a displacement sensor is installed on the slide C, which is used to detect the displacement of the sliding bracket along the Y-axis direction.

[0009] Furthermore, a key is provided on the side wall of the upper end of the support shaft, a mounting hole is provided at the center of the standard gear, and a keyway matching the key is provided on the inner wall of the mounting hole.

[0010] Furthermore, the upper ends of the rotary drive mechanism and the ejector support are both equipped with rotating shafts, the two rotating shafts are coaxially arranged, the outer ends of the rotating shafts are equipped with ejectors, and the inner ends of the rotating shafts are rotatably connected to the rotary drive mechanism / ejector support through bearings.

[0011] Furthermore, the rotary drive mechanism includes a motor, a reduction gearbox is installed at the output end of the motor, the rotating shaft is installed at the output end of the reduction gearbox, the side wall of the rotating shaft is equipped with a toggle frame, the toggle frame is equipped with a clamping sleeve, and the clamping sleeve is locked to the camshaft by a bolt.

[0012] The present invention has the following beneficial effects: 1. It overcomes the influence of deflection and realizes automatic detection of the cam profile and angle of the super-long camshaft; 2. It realizes automatic detection of the gear runout of the super-long camshaft provided with gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2yes Figure 1 The main view; Figure 3 yes Figure 2 A top view of Figure 4 yes Figure 2 BB view; Figure 5 is a three-dimensional view of the adaptive support mechanism of the present invention; Figure 6 yes Figure 5 A top view of Figure 7 yes Figure 6 AA view; Figure 8 This is a three-dimensional view of the supporting wheel bracket of the present invention; In the figure: 1. base; 2. slide B; 3. cam detection mechanism; 4. track B; 5. gear runout detection mechanism; 51. standard gear; 52. guide rail; 53. sliding bracket; 54. cylinder; 55. compression spring; 56. support shaft; 57. displacement sensor; 6. ejector support; 7. first linear drive mechanism; 8. track A; 9. adaptive support mechanism; 91. slide; 92. sliding bracket; 93. leveling bolt; 94. rotating shaft; 95. roller bracket; 96. roller; 10. track C; 11. slide A; 12. rotation drive mechanism; 13. slide C; 14. second linear drive mechanism. DETAILED DESCRIPTION

[0014] See also Figure 1-8This embodiment is an automatic detection device for an assembled super-long camshaft, comprising a base 1, a horizontal detection table provided on the top surface of the base 1, a track A8 and a track B4 arranged along the X-axis being mounted on the detection table, a rotary drive mechanism 12 being fixedly mounted on one end of the track A8, a slide A11 being mounted on the track A8, a thimble support 6 being mounted on the slide A11, a slide B2 being mounted on the track B4, a cam detection mechanism 3 being mounted on the slide B2, a first linear drive mechanism 7 being connected to the slide B2, the cam detection mechanism 3 and the first linear drive mechanism 7 being connected to the slide B2. Each linear drive mechanism 7 is connected to the host computer control system. At least one set of adaptive support mechanisms 9 is installed on the track A8 between the ejector support 6 and the rotary drive mechanism 12. The adaptive support mechanism 9 includes a slide 91, the bottom of which is slidably connected to the track A8. A sliding bracket 92 is installed on the top of the slide 91. A plurality of rotating shafts 94 are installed on the top of the sliding bracket 92. The axes of the rotating shafts 94 are arranged along the X-axis. A roller bracket 95 is placed on the top of the rotating shaft 94, and two rollers 96 are symmetrically installed on the top of the roller bracket 95. The two rollers 96 are used to support the camshaft. The roller bracket 95 is supported by multiple rotating shafts 94, so that the roller bracket 95 can slide in the Y-axis direction. The friction between the roller bracket 95 and the sliding bracket 92 is reduced by rolling friction between the rotating shaft 94 and the roller bracket 95.

[0015] Furthermore, a leveling bolt 93 is installed between the sliding bracket 92 and the slide plate 91. The leveling bolt 93 is composed of a drawing wire and a top screw. The support height of the sliding bracket 92 and the horizontality of the sliding bracket 92 are adjusted by twisting the drawing wire and the top screw.

[0016] Furthermore, the inspection table is equipped with a track C10 arranged along the X-axis, on which a slide C13 is mounted. Slide C13 is connected to a second linear drive mechanism 14. A gear runout detection mechanism 5 is mounted on top of slide C13. Gear runout detection mechanism 5 is used to detect the machining accuracy of the gears on the camshaft. Both the second linear drive mechanism 14 and the gear runout detection mechanism 5 are connected to the host computer control system through signal connections. The host computer control system automatically controls the required measurement operations.

[0017] Furthermore, the second linear drive mechanism 14 includes a servo motor, the output end of the servo motor is equipped with a screw arranged along the X-axis direction, and the screw is threadedly connected to the slide C13. The structure of the first linear drive mechanism 7 is the same as that of the second linear drive mechanism 14.

[0018] Furthermore, the gear runout detection mechanism 5 includes a guide rail 52 arranged along the Y-axis direction, the guide rail 52 is fixedly connected to the slide C13, a sliding bracket 53 is installed on the guide rail 52, and a support shaft 56 arranged along the Z-axis is installed on the end of the sliding bracket 53 close to the camshaft, and a replaceable standard gear 51 is installed on the support shaft 56. The other end of the sliding bracket 53 is equipped with a cylinder 54, the cylinder body of the cylinder 54 is fixedly connected to the slide C13, and a push plate is installed at the end of the piston rod of the cylinder 54. A compression spring 55 is installed between the push plate and the sliding bracket 53, and a displacement sensor 57 is installed on the slide C13. The displacement sensor 57 is used to detect the displacement of the sliding bracket 53 along the Y-axis direction.

[0019] In this embodiment, a protruding detection portion is provided on one side of the sliding bracket 53 , and the detection portion is aligned with the displacement sensor 57 in the Y-axis direction, so that the displacement distance of the detection portion measured in real time by the displacement sensor 57 is equivalent to the displacement distance of the sliding bracket 53 .

[0020] Furthermore, the upper sidewall of the support shaft 56 is provided with a key. The center of the master gear 51 has a mounting hole, and the inner wall of the mounting hole is provided with a keyway that matches the key. The parameters of the helical gears on different camshaft models may also vary. Each helical gear is equipped with a master gear 51. During testing, the master gear 51 corresponding to the workpiece is rotated and mounted on the support shaft 56. The bottom end of the support shaft 56 is rotatably connected to the sliding bracket 53, and the upper end of the support shaft 56 is fixedly connected to the master gear 51 via a key.

[0021] Furthermore, the upper ends of the rotary drive mechanism 12 and the ejector support 6 are both equipped with rotating shafts, the two rotating shafts are coaxially arranged, the outer ends of the rotating shafts are equipped with ejectors, and the inner ends of the rotating shafts are rotatably connected to the rotary drive mechanism 12 / ejector support 6 through bearings.

[0022] By setting the ejector pin to rotate, the tip of the pin rotates synchronously with the camshaft, thereby avoiding friction between the ejector pin and the center hole of the workpiece end face. This prevents the extra-long camshaft from being scratched by the ejector pin during the inspection process due to the high friction caused by its excessive weight.

[0023] Furthermore, the rotary drive mechanism 12 includes a motor, a reduction gear box is installed at the output end of the motor, the rotating shaft is installed at the output end of the reduction gear box, the side wall of the rotating shaft is installed with a toggle frame, the toggle frame is installed with a clamping sleeve, the clamping sleeve is locked to the camshaft by a bolt, and a copper sheet can be placed between the locking bolt and the outer cylindrical surface of the camshaft to prevent the bolt from crushing the outer cylindrical surface of the camshaft.

[0024] When the rotary drive mechanism 12 is in motion, the motor drives the reduction gear box, the reduction gear box drives the shifting frame to rotate, the shifting frame drives the ferrule, and the ferrule finally drives the camshaft to rotate.

[0025] The reason for setting up the adaptive support mechanism 9 in the present invention is as follows: Due to the excessive length of the assembled super-long camshaft, its coaxiality inevitably has a certain degree of processing error. During the detection process, the camshaft rotates continuously. Due to the influence of coaxiality, there is actually a slight displacement in the Y-axis direction. The rotation positions of different points on its axis at the same time may be inconsistent. If the support mechanism is fixed in the Y-axis direction, the camshaft will be subjected to lateral external forces in the Y-axis and Z-axis planes, thereby affecting the accuracy of the cam contour line detection and centerline angle detection. The present invention specifically sets up an adaptive support mechanism 9, so that the camshaft is allowed to have local reciprocating displacement in the Y-axis direction during the detection process, so as to ensure that the cam detection data is more accurate and true.

[0026] When the present invention is working, the operation is as follows: first, move the slide A11 to the appropriate position according to the length of the camshaft, then select 2-4 groups of adaptive support mechanisms 9 and move them to the appropriate position, and then place the camshaft to be tested on the support roller 96 of the support mechanism, one end is locked by the sleeve of the rotary drive mechanism 12, and the thimble of the rotary drive mechanism 12 is inserted into the center hole of the corresponding end face, and the thimble of the thimble support 6 is inserted into the corresponding center hole at the other end to clamp the two ends of the camshaft, and then appropriately adjust the position of each group of adaptive support mechanisms 9 to make it match the reference outer cylindrical surface on the camshaft; then use a micrometer to detect the height of multiple points of the same diameter on the camshaft from the detection table to see if the height is consistent. If it is consistent, it means that the camshaft has been adjusted to a level as a whole and measurement can be started; if the height of a local position exceeds or is lower than other points, adjust the leveling bolt 93 of the adaptive centering mechanism near the point accordingly, and adjust the support height of the support roller 96 by adjusting the wire drawing / thrusting, so as to achieve a state where the height of each point is consistent.

[0027] When the measurement starts, the upper computer control system starts the rotary drive mechanism 12 and the first linear drive mechanism 7, so that the cam detection mechanism 3 moves to the positioning reference of the camshaft. The rotary drive mechanism 12 drives the camshaft to rotate at a certain speed. The cam detection mechanism 3 automatically measures the positioning reference surface. Then, according to the measurement program, the cam detection mechanism 3 is automatically moved to the corresponding cam position one by one, and the contour line of each cam and the angle of the cam center line relative to the positioning reference surface are automatically measured.

[0028] If the camshaft to be tested is equipped with a helical gear, the second linear drive mechanism 14 is activated by the host computer control system to move the slide C13 to the position of the helical gear so that the standard gear 51 of the gear runout detection mechanism 5 is aligned with the helical gear of the camshaft. Then the system controls the cylinder 54 to extend to make the sliding bracket 53 approach the helical gear, so that the standard gear 51 is engaged with the helical gear. At this time, the compression spring 55 is subjected to a certain pressure, and the pressure of the compression spring keeps the standard gear 51 engaged with the helical gear. At the same time, the sliding bracket 53 is allowed to have a certain displacement in the Y-axis direction. During the rotation of the camshaft, the helical gear rotates with the standard gear 51 at the same time. If the runout phenomenon is caused by processing error, the standard gear 51 will produce a small displacement in the Y-axis direction, thereby driving the entire sliding bracket 53 to produce a small displacement on the guide rail 52. At this time, the distance of the sliding bracket 53 is continuously detected by the displacement sensor 57 and the measurement data is uploaded to the host computer, so that the runout amplitude of the helical gear during operation can be measured.

Claims

1. An automatic inspection device for assembled extra-long camshafts, comprising a base, the top surface of which is provided with a horizontal inspection table, the inspection table being provided with track A and track B arranged along the X-axis, one end of track A being fixedly provided with a rotary drive mechanism, track A being provided with a slide A, which is provided with an ejector support, track B being provided with a slide B, which is provided with a cam inspection mechanism, slide B being connected to a first linear drive mechanism, and both the cam inspection mechanism and the first linear drive mechanism being connected to a host computer control system. The device is characterized by: At least one set of adaptive support mechanisms is installed on the track A between the ejector support and the rotary drive mechanism. The adaptive support mechanism includes a slide. The bottom of the slide is slidably connected to the track A. A sliding bracket is installed on the top of the slide. Several rotating shafts are installed on the top of the sliding bracket. The axes of the rotating shafts are arranged along the X-axis. A roller bracket is placed on the top of the rotating shaft, and two rollers are symmetrically installed on the top of the roller bracket.

2. The automatic detection device for assembled extra-long camshafts according to claim 1, characterized in that: A leveling bolt is installed between the sliding bracket and the slide plate. The leveling bolt consists of a drawing wire and a top wire. The support height of the sliding bracket and the horizontality of the sliding bracket can be adjusted by twisting the drawing wire and the top wire.

3. The automatic detection device for an assembled extra-long camshaft according to claim 1, characterized in that: The detection table is also equipped with a track C arranged along the X-axis, a slide C is installed on the track C, the slide C is connected to a second linear drive mechanism, and a gear runout detection mechanism is installed on the top of the slide C. The gear runout detection mechanism is used to detect the processing accuracy of the gears on the camshaft. The second linear drive mechanism and the gear runout detection mechanism are both connected to the host computer control system signal.

4. The automatic detection device for an assembled extra-long camshaft according to claim 3, characterized in that: The second linear drive mechanism includes a servo motor, the output end of the servo motor is equipped with a screw arranged along the X-axis direction, and the screw is threadedly connected to the slide C. The structure of the first linear drive mechanism is the same as that of the second linear drive mechanism.

5. The automatic detection device for an assembled extra-long camshaft according to claim 3, characterized in that: The gear runout detection mechanism includes a guide rail arranged along the Y-axis direction, the guide rail is fixedly connected to the slide C, a sliding bracket is installed on the guide rail, a support shaft arranged along the Z-axis is installed on the end of the sliding bracket close to the camshaft, a replaceable standard gear is installed on the support shaft, a cylinder is installed at the other end of the sliding bracket, the cylinder body of the cylinder is fixedly connected to the slide C, a push plate is installed at the end of the piston rod of the cylinder, a compression spring is installed between the push plate and the sliding bracket, and a displacement sensor is installed on the slide C, which is used to detect the displacement of the sliding bracket along the Y-axis direction.

6. The automatic detection device for an assembled extra-long camshaft according to claim 5, characterized in that: A key is provided on the side wall of the upper end of the support shaft, a mounting hole is provided at the center of the standard gear, and a key groove matching the key is provided on the inner wall of the mounting hole.

7. The automatic detection device for an assembled extra-long camshaft according to claim 1, characterized in that: The upper ends of the rotary drive mechanism and the ejector support are both equipped with rotating shafts, which are coaxially arranged. The outer ends of the rotating shafts are equipped with ejectors, and the inner ends of the rotating shafts are rotatably connected to the rotary drive mechanism / ejector support through bearings.

8. The automatic detection device for an assembled extra-long camshaft according to claim 7, characterized in that: The rotary drive mechanism includes a motor, a reduction gear box is installed at the output end of the motor, the output end of the reduction gear box is installed at the rotating shaft, a toggle frame is installed on the side wall of the rotating shaft, a clamping sleeve is installed on the toggle frame, and the clamping sleeve is locked with the camshaft by a bolt.

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