A method of adjusting the stroke of a cam using a variable cam

Abstract

This invention discloses a method for adjusting the stroke using a variable cam. It includes a variable cam body, characterized in that the variable cam body consists of a fixed cam component and a movable cam component. By moving the movable cam component on the fixed cam component, the perimeter of the variable cam body's contour line is changed, thereby adjusting the length of the stroke trajectory. The variable cam obtained by this invention, using a variable cam to adjust the stroke, only requires adjusting the stroke adjustment screw during operation to change the perimeter of the variable cam body's contour line. This allows for changing the cam's contour line without replacing the cam, thereby altering the motion trajectory or reciprocating linear motion stroke of the follower moving on the cam. This replaces the cam replacement procedure in existing technologies, significantly saving working time and greatly improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of mechanical technology, and in particular to a method for adjusting the stroke using a variable cam. Background Technology

[0002] In the field of mechanics, reciprocating linear motion is often achieved by the oscillation of cams or the movement of rollers along the cam's contour. However, in current technology, because the contour of each cam is fixed, changing the stroke of reciprocating linear motion requires replacing different cams. But replacing cams requires disassembling most of the cam-related components, such as cam rocker arms and forks, and may also require crane assistance for lifting and removing machine covers, making the replacement very difficult and troublesome.

[0003] Chinese patent application CN2012103267848 discloses a cam device for adjusting the stroke of a coating and marking apparatus. It adjusts the stroke trajectory of the cam by adjusting the relative position of the adjusting slider and the drive shaft, so that the shape of the marking can be conveniently and quickly adjusted according to different production requirements. This stroke adjustment can only adjust the position of the cam stroke, and cannot adjust the length of the linear stroke distance caused by the cam swinging or rotating.

[0004] Chinese patent application CN2019222690981 also discloses a reciprocating motion mechanism that changes the stroke and working point through reversal. The reciprocating motion mechanism includes a body, a cam ring, a follower ring, a connecting rod, and a power source connected to the cam ring. The follower ring is disposed on the body, and the cam ring has a receiving groove, with the follower ring slidably connected to the receiving groove. The body has an arc-shaped limiting groove, and one end of the connecting rod is connected to the follower ring, while the other end is slidably connected to the limiting groove. The two opposite ends of the limiting groove are the first working point and the second working point, respectively. The cam ring has an asymmetrical structure, and the inner wall of the receiving groove has multiple spaced V-shaped grooves, with an arc-shaped protrusion between two adjacent V-shaped grooves. The power source is used to drive the cam ring to rotate toward the first working point or the second working point, the cam ring is used to drive the follower ring to rotate, and the follower ring is used to drive the connecting rod to reciprocate. This type of device uses a follower ring to drive the connecting rod to reciprocate, and changes the stroke through multiple spaced V-grooves and a fixed asymmetrical cam ring. The structure is extremely complex, and once the device is fixed, the position of its working point is fixed, and the stroke length cannot be adjusted arbitrarily.

[0005] Chinese patent CN2020227243281 also discloses a reciprocating mechanism with adjustable stroke. It uses a cam, movable rod, guide structure, connecting rod, and slide rod as structural components. To change the stroke of the movable rod 6, it is moved upwards a certain distance to ensure a sufficient gap between its lower end and the cam 4. Then, a fixing sleeve 702 is installed at the lower end of the movable rod 6 and secured with a fastening screw 705. Next, the slide rod 704 is inserted into the round hole at the lower end of the connecting rod 703, ensuring a fixed connection between the slide rod 704 and the connecting rod 703. At this point, the end of the slide rod 704 is engaged in the sliding groove 701. The mechanism is then activated, and the cam 4 rotates, causing the movable rod 6 to reciprocate through the connecting structure 7. The reciprocating stroke is reduced, thus changing the stroke length. This change in stroke distance also requires adjusting the position of the movable rod before a series of installation and fixing steps, making the structure similarly complex. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method for adjusting the stroke using a variable cam, which can change the cam curve profile without replacing the cam, thereby altering the follower's motion trajectory or the stroke of reciprocating linear motion.

[0007] To achieve the above objectives, the present invention provides a method for adjusting the stroke using a variable cam, which includes a variable cam body. The variable cam body is characterized by being composed of a fixed cam component and a movable cam component. By moving the movable cam component on the fixed cam component, the perimeter of the contour line of the variable cam body is changed, thereby adjusting the length of the stroke trajectory.

[0008] Preferably, the method of changing the perimeter of the variable cam body's outline by moving the movable cam component on the fixed cam component is that the movable cam component includes part of the outline of the variable cam body, and a first groove is provided on the fixed cam component along the outline of its variable cam body. The edge of the first groove is part of the outline of the variable cam body. The part of the movable cam component containing the outline of the variable cam body and the first groove as the edge part of the outline of the variable cam body form an openable and movable structure. When the two are closed, the outline of the variable cam body is the shortest. As the two are opened, the outline of the variable cam body gradually extends, making the length of the outline of the variable cam body adjustable.

[0009] Preferably, the structure in which the contour line part of the variable cam body and the first groove in the movable cam component form an openable and closable moving structure is as follows: The movable cam component is placed in the first groove. A horizontally arranged slideway is provided in the movable cam component. A through hole corresponding to the position of the slideway is horizontally penetrated in the fixed cam component. A stroke adjustment screw rod connected to the slideway is provided in the through hole. A thread adapted to the stroke adjustment screw rod is provided in the slideway. The relative displacement between the movable cam component and the fixed cam component is adjusted by the threaded screw rod of the stroke adjustment screw rod in the slideway.

[0010] Preferably, a longitudinally positioned groove in the shape of a "convex" character is provided on the movable cam component. A locking slide piece is provided on the longitudinally positioned groove. A longitudinal fixing screw rod penetrating the fixed cam component longitudinally is connected to the locking slide piece. A fixing nut is provided on the longitudinal fixing screw rod. This serves to longitudinally fix the movable cam component and ensure that the cam contour line on the movable cam component and the cam contour line on the fixed cam component are smoothly opened and closed and docked on the same horizontal plane.

[0011] Preferably, a second groove is provided at the port of the through hole along the side of the contour line of the variable cam body. A counterbore coaxial with the through hole is provided in the second groove. An adjusting nut is provided in the counterbore. A pressing plate is provided outside the counterbore. A pressing plate fixing bolt is provided on the pressing plate to fix the adjusting nut and the stroke adjustment screw rod.

[0012] Preferably, a stroke scale is provided at the lower ends of the fixed cam component and the movable cam component to timely master the stroke adjustment scale.

[0013] A method for adjusting the stroke by using a variable cam provided by the present invention only needs to adjust the stroke adjustment screw rod to change the contour line perimeter of the variable cam body, thereby realizing changing the cam contour line without replacing the cam, and then changing the motion trajectory of the follower moving on the cam or the stroke of the reciprocating linear motion, so as to replace the cam replacement procedure in the prior art, greatly saving working time and greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the variable cam body in the embodiment;

[0015] Figure 2 is a schematic structural view of another perspective of the variable cam body in the embodiment;

[0016] Figure 3 is Figure 1 an enlarged structural view of part A of

[0017] Figure 4 is a schematic structural view of the closed state of the movable cam component and the fixed cam component.

[0018] The components include: fixed cam component 1, first groove 11, second groove 12, through hole 13, movable cam component 2, slide rail 21, longitudinal positioning groove 22, countersunk hole 23, roller 3, stroke adjustment screw 4, adjusting nut 41, pressure plate 5, pressure plate fixing bolt 51, longitudinal fixing screw 6, fixing nut 61, locking slide 7, and stroke scale 8. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Example 1

[0021] This embodiment provides a method for adjusting the stroke using a variable cam. It includes a variable cam body, which consists of a fixed cam component 1 and a movable cam component 2. The length of the stroke trajectory is adjusted by changing the circumference of the contour line of the variable cam body through the movement of the movable cam component 2 on the fixed cam component 1. Figure 1 , Figure 2 As shown, in the implementation process, the method of changing the perimeter of the contour line of the variable cam body by moving the movable cam component 2 on the fixed cam component 1 is that the movable cam component 2 includes part of the contour line of the variable cam body, and a first groove 11 is provided on the fixed cam component 1 along its variable cam body contour line. The edge of the first groove 11 is part of the contour line of the variable cam body. The part of the movable cam component 2 containing the contour line of the variable cam body and the first groove 11 as the edge part of the contour line of the variable cam body form an openable and movable structure, such as... Figure 4 As shown, when both are closed, the profile of the variable cam body is shortest; as they are opened, the profile changes as follows: Figure 2As shown, the contour line of the variable cam body is gradually extended, so that the length of the contour line of the variable cam body is adjustable. The structure of the movable cam component 2, in which the contour line part of the variable cam body and the first groove 11 form an openable and closable movable structure as the edge part of the contour line of the variable cam body, is as follows: The movable cam component 2 is placed in the first groove 11. A horizontally arranged slideway 21 is provided in the movable cam component 2. A through hole 13 corresponding to the position of the slideway 21 is horizontally penetrated on the fixed cam component 1. A stroke adjustment screw 4 connected to the slideway 21 is provided in the through hole 13. A thread adapted to the stroke adjustment screw 4 is provided in the slideway 21. The relative displacement between the movable cam component 2 and the fixed cam component 1 is adjusted by the threaded screw of the stroke adjustment screw 4 in the slideway 21. In this embodiment, the position of the movable cam component 2 is adjusted by the stroke adjustment screw 4, so that the whole adjustment process is relatively stable, the adjustment amplitude is small, and the adjustment accuracy is high. The corresponding setting of the slideway 21 and the through hole 13 also plays a certain limiting role in the adjustment process of the movable cam component 2, so that the movable cam component 2 is always in a suitable adjustment position.

[0022] Embodiment 2:

[0023] A method for adjusting the stroke by using a variable cam provided in this embodiment, on the basis of Embodiment 1, a vertically arranged positioning groove 22 in the shape of a "convex" character is provided on the movable cam component 2. A locking sliding piece 7 is provided on the vertically arranged positioning groove 22. A vertically penetrating fixed screw 6 of the fixed cam component 1 is connected to the locking sliding piece 7. A fixing nut 61 is provided on the vertically fixed screw 6. Thus, the movable cam component 2 is vertically fixed, ensuring that the cam contour line on the movable cam component 2 and the cam contour line on the fixed cam component 1 are smoothly opened and closed and docked on the same horizontal plane, so that the roller 3 walking on the contour line of the variable cam body keeps stable walking. The vertically arranged positioning groove 22 in the shape of a "convex" character prevents the locking sliding piece 7 from shifting up and down, and always keeps a perpendicular connection state with the vertically fixed screw 6. The fixing nut 61 can adjust the position of the cam fixing screw 6. Tightening the fixing nut 61 can make the vertically fixed screw 6 drive the locking sliding piece 7 to move up, so that the movable cam component 2 is tightly fitted with the upper surface of the first groove 11, thus achieving the effect of locking and fixing the movable cam component 2. As Figure 2 shown, the width of the lower surface of the movable cam component 2 and the fixed cam component 1 in this embodiment is the same as the width of the roller 3. The same width prevents the roller 3 from getting stuck in the gap between the fixed cam component 1 and the movable cam component 2 during the movement process. Of course, the vertical positioning of the movable cam component 2 on the fixed cam component 1 is not limited to the structure of this embodiment, and the protection scope of the present invention is not limited to the preferred cases of this embodiment.

[0024] Embodiment 3:

[0025] This embodiment provides a method for adjusting the stroke using a variable cam. Based on embodiment 1 or 2, a second groove 12 is provided on the port of the through hole 13 along the contour line of the variable cam body, such as... Figure 3 As shown, a countersunk hole 23, coaxial with the through hole 13, is provided in the second groove 12. An adjusting nut 41 is provided in the countersunk hole 23, and a clamping plate 5 is provided on the outside of the countersunk hole 23. A clamping plate fixing bolt 51 is provided on the clamping plate 5 to fix the adjusting nut 41 and the stroke adjusting screw 4. A stroke scale 8 is provided at the lower end of the fixed cam component 1 and the movable cam component 2 to promptly grasp the stroke adjustment scale. The variable cam body obtained in this embodiment can easily adjust and change the contour line of the variable cam body, thereby conveniently and accurately adjusting or changing the stroke of the roller 3 or the reciprocating linear motion along the cam contour line. Here, the countersunk hole 23 facilitates the installation of the adjusting nut 41 and limits the adjusting nut 41 to prevent it from deviating from the working position. The clamping plate 5 further limits and fixes the adjusting nut 41, thereby fixing and limiting the stroke adjusting screw 4. In addition, the stroke scale 8 can specify the position adjustment of the movable cam component 2, and can accurately grasp the position of the movable cam component 2.

[0026] During operation, when it is necessary to adjust the stroke of the variable cam body, first loosen the fixing nut 61 to loosen the longitudinal fixing screw 6 and locking slide 7 to release the movable cam component 2. Then loosen the clamping plate fixing bolt 51, thereby rotating the stroke adjusting screw 4 to move the movable cam component 2. The displacement distance of the movable cam component 2 is controlled according to the stroke scale 8. After the movable cam component 2 moves to the designated position, tighten the clamping plate fixing bolt 51 and fixing nut 61 in sequence to lock and fix the movable cam component 2 in the designated working position, completing the profile change of the cam and causing the roller 3 to move along the new path.

[0027] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for adjusting stroke using a variable cam, comprising employing a variable cam body, characterized in that... The variable cam body consists of a fixed cam component (1) and a movable cam component (2). By moving the movable cam component (2) on the fixed cam component (1), the perimeter of the contour line of the variable cam body is changed, so as to adjust the length of the stroke trajectory. The method of changing the perimeter of the contour line of the variable cam body by moving the movable cam component (2) on the fixed cam component (1) is that the movable cam component (2) includes a part of the contour line of the variable cam body. A first groove (11) is arranged on the fixed cam component (1) along the contour line of the variable cam body. The edge of the first groove (11) is a part of the contour line of the variable cam body. The part of the contour line of the variable cam body included in the movable cam component (2) and the first groove (11) form an openable and closable moving structure as the edge part of the contour line of the variable cam body. When the two are closed, the contour line of the variable cam body is the shortest. As the two are pulled apart, the contour line of the variable cam body gradually extends, so that the length of the contour line of the variable cam body can be adjusted. The part of the contour line of the variable cam body included in the movable cam component (2) and the first groove (11) form an openable and closable moving structure as the edge part of the contour line of the variable cam body in the following way: The movable cam component (2) is placed in the first groove (11). A horizontally arranged slideway (21) is arranged in the movable cam component (2). A through hole (13) corresponding to the position of the slideway (21) is horizontally penetrated on the fixed cam component (1). A stroke adjustment screw (4) connected to the slideway (21) is arranged in the through hole (13). A thread adapted to the stroke adjustment screw (4) is arranged in the slideway (21). The relative displacement between the movable cam component (2) and the fixed cam component (1) is adjusted by the threaded screw of the stroke adjustment screw (4) in the slideway (21). A longitudinally positioned groove (22) in the shape of a "convex" character is arranged on the movable cam component (2). A locking slide (7) is arranged on the longitudinally positioned groove (22). A longitudinal fixing screw (6) longitudinally penetrating the fixed cam component (1) is connected to the locking slide (7). A fixing nut (61) is arranged on the longitudinal fixing screw (6).

2. A method for adjusting the stroke by using a variable cam according to claim 1, characterized in that a second groove (12) is arranged at the port of the through hole (13) along the side of the contour line of the variable cam body. A counterbore (23) coaxial with the through hole (13) is arranged in the second groove (12). An adjusting nut (41) is arranged in the counterbore (23). A pressing plate (5) is arranged outside the counterbore (23). A pressing plate fixing bolt (51) is arranged on the pressing plate (5) to fix the adjusting nut (41) and the stroke adjustment screw (4).

3. A method for adjusting the stroke by using a variable cam according to claim 1, characterized in that a stroke scale (8) is arranged at the lower ends of the fixed cam component (1) and the movable cam component (2).

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