An automatic marking device for timing line of camshaft end parts

Abstract

The present invention provides a device for automatically marking the timing line of a camshaft end piece, and relates to the technical field of camshaft processing equipment. The device comprises a marking machine and a clamping seat fixed on a workbench of the marking machine and capable of adjusting the clamping tightness. A mandrel is rotatably arranged in the clamping seat, an end piece connecting portion is arranged at one end of the mandrel, and an electric rotating mechanism for driving the end piece to rotate is arranged on the outer side of the mandrel. The mandrel is evenly distributed with a plurality of slots along the circumference, and a limit block capable of being embedded in the slot is connected to the clamping seat through an elastic slide bar, an electromagnetic adsorption device is arranged at one end of the elastic slide bar away from the limit block, a power-off delay device is connected to the electromagnetic adsorption device, a state detector is arranged on the elastic slide bar, and the marking machine, the electric rotating mechanism, the power-off delay device and the state detector are all connected to a controller. The problem of using a dividing head to determine the angle in marking the timing line on the camshaft end piece in the prior art, which is complicated and inefficient, is solved.

Description

Technical Field

[0001] The invention relates to the technical field of camshaft processing equipment, in particular to an automatic marking device for timing lines of camshaft end pieces. Background Art

[0002] When the combined camshaft is installed in the engine, in order to ensure the angle between the cam of each cylinder of the camshaft and the timing gear, a positioning pin hole is generally provided at the camshaft end piece position. By ensuring the angle between the cam of each cylinder of the camshaft and the pin hole, and then connecting the end piece pin hole and the timing gear through the positioning pin, the angle between the cam of each cylinder of the camshaft and the timing gear is ensured. When the camshaft is installed in the engine, in order to ensure the angle between the cam and the timing gear mentioned above, it is also necessary to engrave the timing line at the end piece position to ensure that the assembly line can identify the timing of the cam of each cylinder of the camshaft.

[0003] Generally speaking, the cam angle of each cylinder of a three-cylinder engine camshaft is 120°, the cam angle of each cylinder of a four-cylinder engine camshaft is 90°, and the cam angle of each cylinder of a six-cylinder engine camshaft is 60°. In the prior art, a dividing head is usually used to determine the angle, and the dividing head needs to be manually cranked or controlled by electromechanical control to separate the angles. After the angle is determined, the timing line is marked, and the entire operation process is complicated and inefficient. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention provides a camshaft end piece timing line automatic marking device, which solves the problem that marking the timing line on the camshaft end piece using a dividing head to determine the angle is complicated and inefficient.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] Provided is a camshaft end piece timing line automatic marking device, which comprises a marking machine and a clamping seat fixed on a workbench of the marking machine and capable of adjusting the clamping tightness, wherein a core shaft is rotatably arranged in the clamping seat, an end piece connecting portion is arranged at one end of the core shaft, and an electric rotating mechanism for driving the end piece to rotate is arranged on the outer side of the core shaft.

[0007] The core shaft is evenly distributed with multiple slots along the circumference, and the clamping seat is connected with a limit block that can be embedded in the slot through an elastic slide rod. An electromagnetic adsorption device is arranged at the end of the elastic slide rod away from the limit block, and a power-off delay device is connected to the electromagnetic adsorption device. A state detector is arranged on the elastic slide rod, and the marking machine, electric rotating mechanism, power-off delay device and state detector are all connected to the controller.

[0008] The invention has the following beneficial effects: the mandrel can be fixedly connected to the end piece of the camshaft through the end piece connection part, and the mandrel is pre-processed with circumferentially evenly distributed slots, the interval angle between adjacent slots is equal to the cam angle of each cylinder of the camshaft to be marked with the timing line, the number of slots is equal to the number of cylinders, and the mandrel is rotated, and one slot corresponds to marking a timing line on the end piece. When marking the timing line, it is no longer necessary to use a dividing head to separate the angles, which simplifies the operation steps and greatly improves the production efficiency.

[0009] The card slot is used to clamp the limit block, which is connected to the elastic slide bar. The electromagnetic adsorption device is powered on to generate magnetic force to adsorb the elastic slide bar so that the limit block can be removed from the card slot. The controller controls the electric rotating mechanism to rotate the end piece. The power-off delay device rotates the card slot out from under the limit block and then the electromagnetic adsorption device is powered off. The elastic slide bar that loses adsorption slides down under the elastic force. The limit block abuts against the outer wall of the core shaft until it slides into the next card slot and is clamped. The core shaft no longer rotates. The state detector feeds back to the controller that the limit block falls into the card slot, and then the controller controls the marking machine to mark the timing line on the end piece. The entire process of marking the timing line only requires the end piece to be installed on the device. Other separation angles, rotating end pieces, and marking are all controlled by the controller and the action time points are mastered, which reduces labor intensity, saves labor costs, and improves efficiency and processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the camshaft end piece timing line automatic marking device after removing the marking machine.

[0011] Figure 2 It is an axonometric view of the clamping seat clamping the end piece.

[0012] Figure 3 for Figure 1 Axonometric view of the central shaft.

[0013] Figure 4 for Figure 1 Axonometric view of the center limit block.

[0014] Figure 5 for Figure 2 Axonometric view of the middle jacket body.

[0015] Figure 6 and Figure 7 for Figure 2 Axonometric view of the middle U-shaped support plate.

[0016] Figure 8 for Figure 1 Side view of the adjustable pipe clamp.

[0017] Fig. 9 This is a front view of the end piece.

[0018] Among them, 1. Clamping seat; 11. Bottom plate; 12. U-shaped support plate; 13. Jacket; 131. Jacket body; 132. Front baffle; 133. Rear baffle; 134. Opening; 135. Axis hole; 136. Fracture; 137. Connecting piece; 2. Mandrel; 21. Slot; 22. End piece connecting part; 221. Limit groove; 222. Limit pin; 3. Elastic slide bar; 31. Slide seat; 32. Slide bar; 33. Magnetic plate; 34. First spring; 4. Limit block; 5. Electromagnetic adsorption device; 6. Electric rotating mechanism; 61. Adjustable pipe clamp; 611. First retaining ring; 612. Second retaining ring; 613. Reinforcement ring; 614. Adjusting screw; 615. Second spring; 616. Buffer pad; 62. Motor; 7. End piece; 71. Timing line. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0020] like Figure 1 , Figure 2 As shown, the camshaft end piece timing line automatic marking device includes a marking machine and a clamping seat 1 fixed on the marking machine workbench and with adjustable clamping tightness, a core shaft 2 is rotatably arranged in the clamping seat 1, an end piece connecting portion 22 is arranged at one end of the core shaft 2, and an electric rotating mechanism 6 for driving the end piece to rotate is arranged on the outer side of the core shaft 2.

[0021] The core shaft 2 is evenly distributed with multiple slots 21 along the circumference. The clamping seat 1 is connected to a limit block 4 that can be embedded in the slot 21 through an elastic slide rod 3. An electromagnetic adsorption device 5 is provided at the end of the elastic slide rod 3 away from the limit block 4. The electromagnetic adsorption device 5 is connected to a power-off delay device. A state detector is provided on the elastic slide rod 3. The marking machine, the electric rotating mechanism 6, the power-off delay device and the state detector are all connected to the controller.

[0022] For a three-cylinder engine camshaft, the number of the slots 21 is 3, and the interval angle between adjacent slots 21 is 120°; for a four-cylinder engine camshaft, the number of the slots 21 is 4, and the interval angle between adjacent slots 21 is 90°, and so on. One mandrel 2 can only be used to mark the timing line on a camshaft end piece of one specification. A set of corresponding mandrels 2 and clamping seats 1 can be made according to camshaft end pieces of different specifications, or a set can be shared and only the mandrel 2 can be replaced.

[0023] like Figure 1 and Figure 3 As shown, Figure 3 The spindle 2 is used to mark the end piece of the camshaft of a six-cylinder engine. The spindle 2 is cylindrical, and the end piece connection portion 22 is arranged at one end of the spindle 2. The end piece connection portion 22 includes a limiting groove 221 for the end of the end piece to be inserted, and a limiting pin 222 vertically fixed on the bottom surface of the limiting groove 221. The end of the limiting pin 222 extends out of the bottom surface of the limiting groove, and the limiting groove 221 is a cylindrical countersunk hole. The part of the limiting pin 222 protruding from the bottom surface of the limiting groove is inserted into the end piece, so that the end piece is fixedly connected to the spindle 2. Six slots 21 are evenly distributed on the cylindrical surface of the spindle 2. The slots 21 preferably penetrate along the axial direction, and the cross-section of the slots 21 is preferably a circular arc surface. As shown in FIG. Figure 4 As shown, the bottom surface of the limiting block 4 is a convex strip corresponding to the shape of the slot 21 , and the convex strip can be inserted into the slot 21 to limit the rotation of the core shaft 2 relative to the clamping seat 1 .

[0024] The elastic slide bar 3 includes a slide seat 31 fixed on the clamping seat 1 and a slide bar 32 vertically slidably connected to the slide seat 31. A circular hole is provided on the slide seat 31 in the vertical direction for the slide bar 32 to pass through. The top and bottom ends of the slide bar 32 are respectively fixedly connected to the magnetic plate 33 and the limit block 4 after passing through the slide seat 31. A first spring 34 sleeved on the slide bar 32 is connected between the limit block 4 and the slide seat 31. The first spring 34 is a compression spring, and both ends of the first spring 34 are fixedly connected to the limit block 4 and the slide seat 31.

[0025] When the upper end of the slide bar 32 is adsorbed and moved upward by the electromagnetic adsorption device 5, the first spring 34 will be compressed, causing the first spring 34 to deform. After the electromagnetic adsorption device 5 loses its magnetic force, the slide bar 32 moves downward under the elastic force of the first spring 34, so that the bottom surface of the limit block 4 abuts against the outer surface of the core shaft 2. During the rotation process of the core shaft 2, if it encounters a slot 21, it will directly slide into the slot 21, so that the end piece fixedly connected to the core shaft 2 can automatically stop rotating at each slot 21 and can provide a feedback signal to the controller to start the marking machine for marking, making the processing process faster and smoother.

[0026] like Figure 2 As shown, the clamping seat 1 includes a bottom plate 11 and a U-shaped support plate 12 fixed on the bottom plate 11. The bottom plate 11 is used to connect with the workbench of the marking machine. Two U-shaped support plates 12 are spaced apart on the bottom plate 11 through threaded fasteners to support the jacket 13 and the end piece respectively. One of the U-shaped support plates 12 is used to install the jacket 13. Figure 6 Another U-shaped support plate 12 is used to support the outer end of the end member 7, such as Figure 7 shown.

[0027] like Figure 1 , Figure 2 and Figure 5As shown, the jacket 13 includes a jacket body 131, and the jacket body 131 is provided with an axial hole 135 that is clearance-matched with the core shaft 2. The axial ends of the axial hole 135 are detachably connected with a front baffle 132 and a rear baffle 133 through threaded fasteners. The rear baffle 133 is penetrated with an opening 134 for the end piece to be inserted into the end piece connecting portion 22. The jacket body 131 is provided with at least one break 136 in the circumferential direction of the axial hole 135. The break 136 refers to the side wall of the axial hole 135 being broken at one place to form two free ends. A connecting piece 137 is vertically fixed on each free end, and the two connecting pieces 137 are adjustably connected by a set screw. The spacing between the two connecting pieces is controlled by adjusting the tightness of the set screw to achieve the purpose of adjusting the inner diameter of the axial hole 135.

[0028] like Figure 1 As shown, the electric rotating mechanism 6 includes an adjustable pipe clamp 61 that can be radially sleeved and fixed to the end piece and a motor 62 that is transmission-connected to the adjustable pipe clamp 61, and the motor 62 is mounted on the bottom plate 11. Preferably, as Figure 8 As shown, the adjustable pipe clamp 61 includes a first clamp ring 611 and a second clamp ring 612 that are arranged opposite to each other, and the first clamp ring 611 and the second clamp ring 612 can enclose a full circle. The first clamp ring 611 and the second clamp ring 612 are pivotally connected at one end and detachably connected at the other end, similar to the clamp style, and a reinforcement ring 613 is elastically connected to the clamping surface (inner arc surface) of the first clamp ring 611 and the second clamp ring 612, and the reinforcement ring 613 is in the shape of a fan ring concentric with the first clamp ring 611 or the second clamp ring 612.

[0029] An adjusting screw 614 is connected between the first clamping ring 611 or the second clamping ring 612 and the corresponding reinforcement ring 613. The adjusting screw 614 is threadedly connected to the first clamping ring 611 or the second clamping ring 612 in the radial direction. The end of the adjusting screw 614 abuts against the reinforcement ring 613. The reinforcement ring 613 is connected to the first clamping ring 611 or the second clamping ring 612 through a second spring 615. The second spring 615 is symmetrically distributed on both sides of the adjusting screw 614. A buffer pad 616 is fixedly connected to the clamping surface of the reinforcement ring 613. The buffer pad 616 is a rubber pad, which is used to increase the friction at the clamping position and prevent the reinforcement ring 613 from excessively squeezing the end piece and affecting the surface quality of the end piece.

[0030] The second spring 615 is a tension spring. By turning the adjusting screw 614, the first retaining ring 611 and the second retaining ring 612 can be pushed toward the center of the circle to tighten the end piece and pull the second spring 615 to deform. When the adjusting screw 614 is loosened, the first retaining ring 611 and the second retaining ring 612 move away from the center of the circle under the elastic force of the second spring 615.

[0031] A connecting ring is fixedly sleeved on the output shaft of the motor 62, and the connecting ring is fixedly connected to the second clamping ring 612 located below through a connecting block. The output shaft of the motor 62 is coaxially arranged with the adjustable pipe clamp 61. The motor 62 is a reduction motor, and the high speed of the motor is converted into a cam angle rotation of the adjustable pipe clamp 61 through a reducer. The motor 62 only drives the end piece to rotate a certain angle, and the speed is very slow, so it does not require too good rotation accuracy.

[0032] The state detector is a pressure sensor installed on the top of the slide 31 and below the magnetic plate 33, and the top surface of the pressure sensor is flush with the top surface of the slide 31. The preferred model of the pressure sensor is the SK-MH102 membrane box tension pressure sensor of SK-MH102. The preferred model of the controller is the stm32f103zet6 single chip microcomputer. The marking machine is preferably the HG LSF20Y cabinet laser marking machine. The start and stop circuit of the marking machine is connected to the output end of the controller, and the start and stop of the marking machine is controlled by the controller.

[0033] The electromagnetic adsorption device 5 is a suction cup type electromagnet, which generates magnetic force when powered on and disappears when powered off. The controller controls the power on of the electromagnet, and after power on, the power off is delayed by the power off delay device, which is implemented by a delay relay. The power off delay time is to prevent the electromagnet from being powered off too quickly, and the limit block 4 will fall into the same slot. The delay time only needs to ensure that the outer wall surface of the core shaft 2 rotates to the bottom of the limit block 4. After losing the adsorption of the electromagnet, the limit block 4 falls and abuts against the outer cylindrical surface of the core shaft 2. As the core shaft 2 continues to rotate, the next slot 21 is rotated to the bottom of the limit block 4 and the limit block 4 is allowed to slide in.

[0034] The process of using the device to mark the timing line on the camshaft end piece is as follows: insert one end of the end piece into the end piece connecting portion 22 and fix it, and the other end of the end piece is located in the second retaining ring 612, and the first retaining ring 611 and the second retaining ring 612 are covered and fixed, and the adjusting screw 614 is rotated to tighten the end piece. Adjust the laser port of the marking machine to align with the outer cylindrical surface of the cam of the end piece. In the initial state, the limit block 4 is stuck in one of the slots 21. After pressing the start button, the marking machine performs the first timing line marking. The timer in the controller starts to work and counts. After the preset time is reached, the controller controls the electromagnet to energize and adsorb the magnetic plate 33 to make the limit block 4 escape from the slot 21. After the controller energizes the electromagnet, it immediately energizes the motor 62, so that the limit block 4 just escapes from the slot 21 and the core shaft 2 starts to rotate. Under the action of the power-off delay device and the elastic slide bar 3, the limit block 4 is pressed against the outer cylindrical surface of the core shaft 2 until it slides into the next slot 21. After the limit block 4 slides into the slot 21, the magnetic plate 33 will move down and the extrusion pressure sensor will generate an electrical signal to the controller. The controller then controls the motor 62 to stop working and controls the marking machine to mark. Then the above process is repeated until the number of markings of the marking machine reaches the preset value. Fig. 9As shown, it is a front view after the end piece 7 is marked, the timing line 71 is a horizontal line, the number on the horizontal line represents the timing line of the 5-cylinder camshaft, and the number "3" represents the timing line of the 3-cylinder camshaft.

Claims

1. A camshaft end piece timing line automatic marking device, characterized in that: It comprises a marking machine and a clamping seat (1) fixed on a workbench of the marking machine and capable of adjusting the clamping tightness, wherein a core shaft (2) is rotatably arranged in the clamping seat (1), an end piece connecting portion (22) is arranged at one end of the core shaft (2), and an electric rotating mechanism (6) for driving the end piece to rotate is arranged on the outer side of the core shaft (2); The core shaft (2) is evenly distributed with a plurality of slots (21) along the circumference; the clamping seat (1) is connected to a limit block (4) capable of being embedded in the slot (21) via an elastic slide bar (3); an electromagnetic adsorption device (5) is provided at one end of the elastic slide bar (3) away from the limit block (4); a power-off delay device is connected to the electromagnetic adsorption device (5); a state detector is provided on the elastic slide bar (3); and the marking machine, the electric rotating mechanism (6), the power-off delay device and the state detector are all connected to a controller; The elastic slide bar (3) comprises a slide seat (31) fixed on the clamping seat (1) and a slide bar (32) vertically slidably connected to the slide seat (31); the top and bottom ends of the slide bar (32) penetrate the slide seat (31) and are respectively fixedly connected to the magnetic plate (33) and the limit block (4); a first spring (34) sleeved on the slide bar (32) is connected between the limit block (4) and the slide seat (31); The clamping seat (1) comprises a base plate (11) and a U-shaped support plate (12) fixed to the base plate (11); a jacket (13) is detachably connected to the U-shaped support plate (12); the core shaft (2) is rotatably connected to the jacket (13); and an opening (134) is provided at one end of the jacket (13) for inserting an end piece into the end piece connecting portion (22); The jacket (13) comprises a jacket body (131), the jacket body (131) is provided with an axial hole (135) which is clearance-matched with the core shaft (2), the axial ends of the axial hole (135) are detachably connected with a front baffle (132) and a rear baffle (133), the opening (134) is arranged on the rear baffle (133), the jacket body (131) is provided with at least one break (136) in the circumferential direction of the axial hole (135), connecting plates (137) are respectively fixed on both sides of the break (136), and the two connecting plates (137) are adjustably connected via fasteners; The end piece connecting portion (22) comprises a limiting groove (221) for the end of the end piece to be inserted into, and a limiting pin (222) vertically fixed on the bottom surface of the limiting groove (221), and the end of the limiting pin (222) extends out of the bottom surface of the limiting groove; The electric rotating mechanism (6) comprises an adjustable pipe clamp (61) capable of radially sleeve-engaging and fixing the end piece, and a motor (62) drivingly connected to the adjustable pipe clamp (61); The state detector is a pressure sensor mounted on the top of the slide seat (31) and located below the magnetic plate (33).

2. The camshaft end piece timing line automatic marking device according to claim 1, characterized in that: The adjustable pipe clamp (61) comprises a first clamping ring (611) and a second clamping ring (612) which are arranged opposite to each other, wherein one end of the first clamping ring (611) and the second clamping ring (612) are pivotally connected and the other end is detachably connected, and a reinforcing ring (613) is elastically connected to the clamping surface of the first clamping ring (611) and the second clamping ring (612), and an adjusting screw (614) is connected between the reinforcing ring (613) and the first clamping ring (611) or the second clamping ring (612).

3. The camshaft end piece timing line automatic marking device according to claim 2, characterized in that: The adjusting screw (614) is threadedly connected to the first clamping ring (611) or the second clamping ring (612) along a radial direction, and an end of the adjusting screw (614) abuts against the reinforcing ring (613). The reinforcing ring (613) is connected to the first clamping ring (611) or the second clamping ring (612) via a second spring (615).

4. The camshaft end piece timing line automatic marking device according to claim 2 or 3, characterized in that: A buffer pad (616) is fixedly connected to the clamping surface of the reinforcement ring (613).

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