Camshaft clamping device

Abstract

The application relates to the technical field of clamping devices, and discloses a camshaft clamping device which comprises a base, a connecting seat fixedly connected to the top of the base, a rotating table fixedly connected to the outer wall of the connecting seat, a camshaft fixedly connected to the inside of the rotating table, and a placing mechanism fixedly connected to the top of the base. The placing mechanism comprises a first push rod, the outer wall of the first push rod is fixedly connected to the base, the top of the first push rod is fixedly connected to a connecting frame, and the inner wall of the connecting frame is fixedly connected to a fixing assembly. The placing mechanism is arranged, the first push rod is used for driving the connecting frame to drive the whole fixing assembly to adjust the height, the corresponding fixing assembly can be adjusted to a suitable height according to the actual position of a machining part, the tool feeding path or the approach area of a grinding wheel is avoided, interference and collision between a clamp and a machining executing component are effectively avoided, and the operation convenience and process arrangement flexibility of the equipment are improved.

Description

Technical Field

[0001] This invention relates to the field of clamping device technology, specifically a camshaft clamping device. Background Technology

[0002] The camshaft is a component in a piston engine. Its function is to control the opening and closing of the valves. Although the camshaft rotates at half the speed of the crankshaft in a four-stroke engine, its speed is still usually very high, and it needs to withstand a large torque. Therefore, the design of the camshaft requires high strength and support, and its material is generally high-quality alloy steel or alloy steel. Because the valve movement pattern is related to the power and operating characteristics of an engine, the camshaft design plays a very important role in the engine design process.

[0003] Patent application CN202220271524.4 discloses a camshaft clamping device, specifically relating to the field of clamping device technology. The device includes a base plate with a groove at its top centerline. Two moving mechanisms are located on the top of the base plate, and an auxiliary mechanism is housed within the groove. Each moving mechanism includes a support plate with an L-shaped cross-section. A first electrically operated telescopic rod is located on one side of the support plate, and a movable plate is located on the other side of the first electrically operated telescopic rod. The device's ability to clamp camshafts of various sizes is enhanced by the coordinated arrangement of the support plate, the first electrically operated telescopic rod, the movable plate, and the fixed ring within the moving mechanism. Furthermore, the auxiliary mechanism's coordinated arrangement of a sliding rod, a first sliding block, a sliding plate, a limiting plate, and a second sliding block ensures smoother movement during camshaft clamping, thus improving the device's practicality.

[0004] In existing equipment, the camshaft is generally held by two centers or chucks, leaving the middle section of the camshaft suspended in the air during machining, lacking effective auxiliary support. Because the camshaft itself has a large length-to-diameter ratio and the cam profile needs to withstand large radial cutting and grinding forces during machining, the long suspension span makes the shaft body prone to radial vibration and bending deformation during machining, affecting the machining accuracy and surface quality of key profiles such as the cam tip and journal. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a camshaft clamping device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a camshaft clamping device, comprising a base, a connecting seat fixedly connected to the top of the base, a rotating platform fixedly connected to the outer wall of the connecting seat, a camshaft fixedly connected to the inside of the rotating platform, and a placement mechanism fixedly connected to the top of the base; The placement mechanism includes: The first push rod has its outer wall fixedly connected to the base, and a connecting frame is fixedly connected to its top. A fixing component is fixedly connected to the inner wall of the connecting frame. The first push rod is used to control the height of the fixing component. By setting up a placement mechanism, the first push rod drives the connecting frame to adjust the height of the entire fixing component. This allows the equipment to adjust the corresponding fixing component to a suitable height according to the actual position of the processing part, avoiding the tool feed path or the area where the grinding wheel is close. This effectively avoids interference and collision between the fixture and the processing execution part, improving the ease of operation and the flexibility of process arrangement.

[0007] According to the above technical solution, the fixing component includes a first connecting plate, the outer wall of the first connecting plate is fixedly connected to the connecting frame, and rails are fixedly connected to both the left and right sides of the first connecting plate. Movable components are movably connected to the inner walls of both rails, wherein the rails are used to limit the range of motion of the movable components. By setting the fixing component, while retaining the rotary table for clamping the camshaft end, an auxiliary clamping station is added in the middle of the camshaft. A first arc-shaped plate and a second arc-shaped plate matching the outer contour of the camshaft are used to wrap around and clamp the shaft, increasing the clamping contact area and allowing the clamping force to be distributed circumferentially along the shaft, effectively avoiding shaft deformation or surface damage caused by local stress concentration. Simultaneously, the auxiliary clamping shortens the camshaft's overhang span during processing, suppressing vibration and bending deformation caused by cutting or grinding forces, and ensuring the machining accuracy and surface quality of the camshaft.

[0008] According to the above technical solution, a first arc-shaped groove is fixedly connected to the top of the first connecting plate. A first through hole is provided inside the first arc-shaped groove. The first through hole passes through the first arc-shaped groove and extends to the bottom of the first connecting plate. The first through hole is used for the entry of light from the infrared ranging probe. It cooperates with the second through hole to determine whether the first arc-shaped plate has moved to the corresponding position by measuring the distance. If the distance measurement value is too short, it indicates that the first arc-shaped plate has not reached the predetermined position. At this time, the movable component must not be opened to prevent jamming and collision.

[0009] According to the above technical solution, the movable component includes a right-angle plate, a slider is fixedly connected to the bottom of the right-angle plate, the outer wall of the slider is movably connected to the track, a second push rod is fixedly connected to the bottom of the first connecting plate, and the movable end of the second push rod is fixedly connected to the right-angle plate. The second push rod is used to control the overall position of the movable component. When the second push rod extends, it drives the right-angle plate to move the third arc plate and the second arc plate away from the camshaft, thereby opening the clamping space. When the second push rod retracts, it drives the second arc plate to move closer to the first arc plate, thereby achieving the wrapping and clamping of the camshaft.

[0010] According to the above technical solution, a third arc-shaped plate is fixedly connected to the top of the right-angle plate, a second connecting plate is fixedly connected to the top of the third arc-shaped plate, and a locking component is fixedly connected to the bottom of the second connecting plate on the side away from the third arc-shaped plate.

[0011] According to the above technical solution, a second arc-shaped groove is provided on the front side of the third arc-shaped plate, and a through groove is provided on the inner side of the second arc-shaped groove. The through groove passes through the second arc-shaped groove and extends to the outer wall of the third arc-shaped plate. The through groove is used to limit the range of motion of the locking component body.

[0012] According to the above technical solution, a second arc-shaped plate is movably connected to the inner wall of the second arc-shaped groove, and a first arc-shaped plate is movably connected to the inner wall of the first arc-shaped groove. A second through hole is opened on the inner side of the first arc-shaped plate. The first arc-shaped plate and the second arc-shaped plate are used to wrap the camshaft. By setting the first arc-shaped plate and the second arc-shaped plate, an openable and closable wrap-around positioning structure is formed. The arc-shaped plate has a contour guiding function. Relying on the guiding effect of the arc-shaped surface, the workpiece is quickly pushed to the predetermined position to achieve rapid positioning without relying on the operator's visual judgment or additional measuring tools for repeated correction. This structure effectively shortens the clamping auxiliary time of a single workpiece and improves production efficiency in mass production.

[0013] According to the above technical solution, the locking component includes a first connecting block, the top of which is fixedly connected to a second connecting plate, a third push rod fixedly connected to the inner wall of the first connecting block, a second connecting block fixedly connected to the movable end of the third push rod, a fixing plate fixedly connected to the end of the second connecting block away from the third push rod, and the outer wall of the fixing plate movably connected to the through groove. The first connecting block is used to control the position of the through groove. By setting the locking component, the position of the arc-shaped plate is fixed, effectively preventing the second arc-shaped plate from loosening or slipping due to vibration or impact during cutting, ensuring the continuous and reliable tightness of the wrap-around clamping; and improving the long-term stability and anti-interference capability of the clamping state.

[0014] Compared with the prior art, the present invention provides a camshaft clamping device, which has the following advantages: 1. This invention, by setting a fixed component, adds an auxiliary clamping station in the middle of the camshaft while retaining the rotary table for clamping the end of the camshaft. It uses a first arc-shaped plate and a second arc-shaped plate that match the outer contour of the camshaft to wrap around and clamp the shaft, increasing the clamping contact area and allowing the clamping force to be distributed along the circumference of the shaft, effectively avoiding shaft deformation or surface damage caused by local stress concentration. At the same time, the auxiliary clamping shortens the suspension span of the camshaft during the processing, suppresses vibration and bending deformation caused by cutting or grinding forces, and ensures the processing accuracy and surface quality of the camshaft.

[0015] 2. By setting a locking component, the present invention fixes the position of the arc plate, effectively preventing the second arc plate from loosening or slipping due to vibration or impact during cutting, ensuring the tightness and reliability of the wrap-around clamping; and improving the long-term stability and anti-interference ability of the clamping state.

[0016] 3. By setting up a placement mechanism, the present invention uses the first push rod to drive the connecting frame to adjust the height of the entire fixed component. This allows the device to adjust the corresponding fixed component to a suitable height according to the actual position of the processing part, avoiding the tool feed path or the area close to the grinding wheel. This effectively avoids interference and collision between the fixture and the processing execution part, and improves the ease of operation and flexibility of process arrangement.

[0017] 4. This invention forms an openable and closable enveloping positioning structure by setting a first arc-shaped plate and a second arc-shaped plate. The arc-shaped plate has a contour-guided function. Relying on the guiding effect of the arc-shaped surface, the workpiece is quickly pushed to the predetermined position to achieve rapid positioning without relying on the operator's visual judgment or additional measuring tools for repeated correction. This structure effectively shortens the clamping auxiliary time of a single workpiece and improves production efficiency in mass production. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the placement mechanism of the present invention; Figure 3 Schematic diagram of the fixing component of the present invention Figure 1 ; Figure 4 Schematic diagram of the fixing component of the present invention Figure 2 ; Figure 5 Schematic diagram of the fixing component of the present invention Figure 3 ; Figure 6 Schematic diagram of the active components of the present invention Figure 1 ; Figure 7 Schematic diagram of the active components of the present invention Figure 2 ; Figure 8 This is a schematic diagram of the locking component of the present invention.

[0019] In the diagram: 1. Base; 101. Connecting seat; 102. Rotary table; 103. Camshaft; 2. Placement mechanism; 201. First push rod; 202. Connecting frame; 21. Fixing component; 211. First connecting plate; 212. Track; 213. First arc groove; 214. First through hole; 215. First arc plate; 216. Second through hole; 217. Second arc plate; 22. Movable component; 221. Right angle plate; 222. Third arc plate; 223. Second arc groove; 224. Second connecting plate; 225. Through groove; 226. Slider; 227. Second push rod; 23. Locking component; 231. First connecting block; 232. Third push rod; 233. Second connecting block; 234. Fixing plate. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Example 1: See Figures 1-5 The present invention provides a technical solution: a camshaft clamping device, including a base 1, a connecting seat 101 fixedly connected to the top of the base 1, a rotating platform 102 fixedly connected to the outer wall of the connecting seat 101, a camshaft 103 fixedly connected to the inside of the rotating platform 102, and a placement mechanism 2 fixedly connected to the top of the base 1. The placement mechanism 2 includes: a first push rod 201, the outer wall of the first push rod 201 is fixedly connected to the base 1, a connecting frame 202 is fixedly connected to the top of the first push rod 201, and a fixing component 21 is fixedly connected to the inner wall of the connecting frame 202. The first push rod 201 is used to control the height of the fixing component 21. When it is necessary to lower the corresponding fixing component 21, its locking state is first released, and then the first push rod 201 drives it to lower as a whole.

[0024] The fixing component 21 includes a first connecting plate 211, the outer wall of which is fixedly connected to the connecting frame 202. Tracks 212 are fixedly connected to both the left and right sides of the first connecting plate 211. Movable components 22 are movably connected to the inner walls of the two tracks 212. The tracks 212 are used to limit the range of motion of the movable components 22. A first arc-shaped groove 213 is fixedly connected to the top of the first connecting plate 211. A first through hole 214 is opened inside the first arc-shaped groove 213. The first through hole 214 passes through the first arc-shaped groove 213 and extends to the bottom of the first connecting plate 211. The first through hole 214 is used for the entry of light from the infrared ranging probe. In the initial state, the first push rod 201 is in the extended position, the fixing component 21 is in the open state, and the second arc-shaped plate 217 is separated from the first arc-shaped plate 215 to form a placement space for the camshaft 103, so that the operator can easily place the camshaft 103 onto the first arc-shaped plate 215.

[0025] The inner wall of the second arc-shaped groove 223 is movably connected to a second arc-shaped plate 217, and the inner wall of the first arc-shaped groove 213 is movably connected to a first arc-shaped plate 215. A second through hole 216 is provided on the inner side of the first arc-shaped plate 215. The first arc-shaped plate 215 and the second arc-shaped plate 217 are used to wrap the camshaft 103, while the first through hole 214 is used for the light from the external detector to pass through. It works in conjunction with the second through hole 216. Only when the first arc-shaped plate 215 is in the predetermined lower position can the light path be unobstructed, and the detector outputs an allow signal, so that the movable component 22 can perform the opening action, effectively avoiding jamming caused by misalignment.

[0026] It should be noted that the wrap-around clamping requires the first arc plate 215 and the second arc plate 217 to be closed. Therefore, the closing and unfolding actions are only allowed when the first arc plate 215 and the second arc plate 217 are in corresponding positions; otherwise, the first arc plate 215 and the second arc plate 217 will cross and get stuck between the movable component 22 and the fixed component 21, causing the device to be unable to open and close normally.

[0027] Example 2: Please refer to Figures 6-8Based on Embodiment 1, the present invention provides a technical solution: the movable component 22 includes a right-angle plate 221, a slider 226 fixedly connected to the bottom of the right-angle plate 221, the outer wall of the slider 226 being movably connected to the track 212, a second push rod 227 fixedly connected to the bottom of a first connecting plate 211, the movable end of the second push rod 227 being fixedly connected to the right-angle plate 221, wherein the second push rod 227 is used to control the overall position of the movable component 22, a third arc-shaped plate 222 fixedly connected to the top of the right-angle plate 221, a second connecting plate 224 fixedly connected to the top of the third arc-shaped plate 222, and the bottom of the second connecting plate 224 on the side away from the third arc-shaped plate 222 being fixed. The locking assembly 23 is connected to the third arc plate 222. A second arc groove 223 is provided on the front side of the third arc plate 222. A through groove 225 is provided on the inner side of the second arc groove 223. The through groove 225 passes through the second arc groove 223 and extends to the outer wall of the third arc plate 222. The through groove 225 is used to limit the range of motion of the main body of the locking assembly 23. After the camshaft 103 is placed on the first arc plate 215, the second push rod 227 drives the right angle plate 221 to retract, which in turn drives the third arc plate 222 and the second arc plate 217 to move closer to the shaft body until the second arc plate 217 and the first arc plate 215 close together, forming a complete wrap-around clamping of the camshaft 103.

[0028] The locking assembly 23 includes a first connecting block 231, the top of which is fixedly connected to a second connecting plate 224. A third push rod 232 is fixedly connected to the inner wall of the first connecting block 231. A second connecting block 233 is fixedly connected to the movable end of the third push rod 232. A fixing plate 234 is fixedly connected to the end of the second connecting block 233 away from the third push rod 232. The outer wall of the fixing plate 234 is movably connected to the through groove 225. The first connecting block 231 is used to control the position of the through groove 225. When the movable assembly 22 is extended outward to a non-clamping state, or when the camshaft 103 needs to be processed in a stationary state without rotation, the locking assembly 23 must perform a locking action to maintain the stability of the current posture and prevent accidental displacement or loosening.

[0029] When locking is required, the third push rod 232 is activated, and its movable end extends to push the second connecting block 233 and the fixing plate 234 to move along the direction of the through groove 225. The fixing plate 234 slides in the through groove 225 until the fixing plate 234 passes through the second arc groove 223 and abuts against the outer wall of the second arc plate 217, pressing it firmly and fixing it in the current position, thereby achieving locking.

[0030] It should be noted that during processing, because the wrap-around clamping mechanism needs to avoid repeated opening and closing after clamping, the first arc-shaped plate 215 and the second arc-shaped plate 217 can rotate with the camshaft 103; however, this rotation can cause vibration during processing. Therefore, when driving the camshaft 103 to rotate, the locking component 23 does not perform clamping, allowing the equipment to rotate normally; while during processing, the locking component 23 performs clamping to avoid vibration. Furthermore, when the movable component 22 unfolds, as the second arc-shaped plate 217 is in place, the locking component 23 also secures it, preventing the second arc-shaped plate 217 from detaching during unfolding and causing the movable component 22 to fail to reset properly.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] 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 camshaft clamping device, comprising a base (1), a connecting seat (101) fixedly connected to the top of the base (1), a rotating platform (102) fixedly connected to the outer wall of the connecting seat (101), and a camshaft (103) fixedly connected inside the rotating platform (102), characterized in that: The top of the base (1) is fixedly connected to a placement mechanism (2); The placement mechanism (2) includes: The first push rod (201) has its outer wall fixedly connected to the base (1), and a connecting frame (202) is fixedly connected to the top of the first push rod (201). A fixing component (21) is fixedly connected to the inner wall of the connecting frame (202). The first push rod (201) is used to control the height of the fixing component (21). The fixing component (21) includes a first connecting plate (211), the outer wall of the first connecting plate (211) is fixedly connected to the connecting frame (202), the top of the first connecting plate (211) is fixedly connected to a first arc groove (213), the interior of the first arc groove (213) is provided with a first through hole (214), and movable components (22) are provided on the left and right sides of the top of the first connecting plate (211). The active component (22) includes a right-angle plate (221), and a third arc-shaped plate (222) is fixedly connected to the top of the right-angle plate (221). A second arc-shaped groove (223) is provided on the front side of the third arc-shaped plate (222). The inner wall of the second arc groove (223) is movably connected to a second arc plate (217), and the inner wall of the first arc groove (213) is movably connected to a first arc plate (215). The inner side of the first arc plate (215) is provided with a second through hole (216). The first arc plate (215) and the second arc plate (217) are used to wrap the camshaft (103).

2. The camshaft clamping device according to claim 1, characterized in that: The first connecting plate (211) is fixedly connected to rails (212) on both the left and right sides. The inner walls of the two rails (212) are movably connected to the movable component (22). The rails (212) are used to limit the range of motion of the movable component (22).

3. The camshaft clamping device according to claim 2, characterized in that: The first through hole (214) passes through the first arc-shaped groove (213) and extends to the bottom of the first connecting plate (211), wherein the first through hole (214) is used for the entry of light from the infrared ranging probe.

4. The camshaft clamping device according to claim 3, characterized in that: The bottom of the right-angle plate (221) is fixedly connected to a slider (226), the outer wall of the slider (226) is movably connected to the track (212), the bottom of the first connecting plate (211) is fixedly connected to a second push rod (227), the movable end of the second push rod (227) is fixedly connected to the right-angle plate (221), wherein the second push rod (227) is used to control the overall position of the movable component (22).

5. A camshaft clamping device according to claim 4, characterized in that: The top of the third arc plate (222) is fixedly connected to a second connecting plate (224), and the bottom of the second connecting plate (224) on the side away from the third arc plate (222) is fixedly connected to a locking component (23).

6. A camshaft clamping device according to claim 5, characterized in that: The inner side of the second arc-shaped groove (223) is provided with a through groove (225), which penetrates the second arc-shaped groove (223) and extends to the outer wall of the third arc-shaped plate (222). The through groove (225) is used to limit the range of motion of the main body of the locking component (23).

7. A camshaft clamping device according to claim 6, characterized in that: The locking component (23) includes a first connecting block (231), the top of which is fixedly connected to a second connecting plate (224), a third push rod (232) is fixedly connected to the inner wall of the first connecting block (231), a second connecting block (233) is fixedly connected to the movable end of the third push rod (232), a fixing plate (234) is fixedly connected to the end of the second connecting block (233) away from the third push rod (232), and the outer wall of the fixing plate (234) is movably connected to the through groove (225). The first connecting block (231) is used to control the position of the through groove (225).

Images