A straightening device for a valve stem

Abstract

The utility model discloses a kind of straightening devices for valve stem, it is related to valve stem production technical field, including workbench, detection assembly, fixed rotating assembly and straightening assembly are arranged on the workbench, the detection assembly includes liftable bottom plate, the bottom plate upside is provided with several fixed tubes along linear arrangement, spring is arranged in each fixed tube, the spring upside is butt-jointed with probe, the probe is slidably connected with fixed tube, the probe upper end is contacted with valve stem stem by penetrating fixed tube, the spring lower end is butt-jointed with pressure sensor, the pressure sensor signal is connected with processor, the device improves the characteristics of valve stem straightening precision.

Description

Technical Field

[0001] This utility model relates to the field of valve stem manufacturing technology, specifically to a straightening device for valve stems. Background Technology

[0002] The valve stem is responsible for feeding air into the engine and expelling exhaust gases after combustion; it is one of the key components affecting the reliability and safety of the engine. As a precision component, the valve stem has extremely high requirements for straightness.

[0003] Traditional straightening mainly relies on manual visual inspection or simple measuring tools to detect the bending position, which has problems such as low efficiency, strong subjectivity, and difficulty in guaranteeing accuracy.

[0004] After determining the bending point, the valve stem needs to be precisely rotated until the bent protrusion faces upwards, and this angle position must be maintained stably during the straightening process. Existing equipment or methods are cumbersome and inaccurate in this step, which can easily lead to poor straightening results or damage to the workpiece.

[0005] Traditional straightening relies mainly on experience to apply force, making it difficult to precisely control the straightening force and stroke. This can easily lead to over-straightening (reverse bending) or under-straightening (bending not being completely eliminated). Furthermore, the detection, positioning, fixing, and straightening processes are separated, requiring many manual operation steps, resulting in low overall efficiency, poor consistency, and unsuitability for mass production.

[0006] Therefore, it is necessary to design a valve stem straightening device to improve the straightening accuracy of the valve stem. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a straightening device for valve stems, thereby solving the problems mentioned in the background section.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a straightening device for valve stems, comprising a worktable, a detection component, a fixed rotation component, and a straightening component arranged on the worktable. The detection component includes a liftable base plate, and a plurality of fixed tubes arranged linearly are arranged on the upper side of the base plate. A spring is sleeved inside each fixed tube, and a probe abuts against the upper side of the spring. The probe is slidably connected to the fixed tube, and the upper end of the probe extends out of the fixed tube and contacts the valve stem body. A pressure sensor abuts against the lower end of the spring, and the pressure sensor signal is connected to a processor.

[0009] The present invention further describes that the fixed rotation assembly includes two fixed blocks, the detection assembly is disposed between the two fixed blocks, the center of the two fixed blocks is provided with a mounting hole, a rotatable rotating ring is sleeved in the two mounting holes, and three hydraulic telescopic cylinders are disposed in the inner ring of the rotating ring, and the output ends of the three hydraulic telescopic cylinders are all fixedly connected to clamping blocks.

[0010] The present invention further describes that an external gear ring is fixedly connected to the outer ring side of the rotating ring, an annular groove is opened on the inner wall of the mounting hole corresponding to the external gear ring, a transmission cavity is opened in the fixed block, the transmission cavity is connected to the annular groove, a drive motor is fixedly connected to one side of each of the two fixed blocks, and the output shaft of the drive motor is fixedly connected to a first gear through the transmission cavity, the first gear meshing with the external gear ring gear.

[0011] The present invention further describes that a locking cavity is provided in the fixing block, the locking cavity is connected to the annular groove, a locking assembly is provided in the locking cavity, the locking assembly includes a second gear, the second gear is rotatably connected to the inner wall of the locking cavity, the second gear meshes with the external gear ring gear, an electromagnetic brake is fixedly connected to the outside of the fixing block, and the shaft of the second gear passes through the fixing block and enters the brake of the electromagnetic brake.

[0012] This utility model further illustrates that hydraulic telescopic cylinders are provided at both ends of the lower side of the base plate along its length direction. The fixed end of the hydraulic telescopic cylinder is fixedly connected to the workbench, and the output end of the hydraulic telescopic cylinder is fixedly connected to the base plate.

[0013] The present invention further describes that the straightening component is positioned directly above the detection component, the straightening component includes a base, a hydraulic telescopic cylinder three is fixedly connected to the side of the base facing the workbench, and a top block is fixedly connected to the output end of the hydraulic telescopic cylinder three.

[0014] This utility model further illustrates that a connecting frame is fixedly connected to the upper side of the workbench, and two guide rails are fixedly connected to the side of the connecting frame opposite to the upper side of the workbench. The base has a sliding groove corresponding to the guide rail, and the sliding groove cooperates with the guide rail. A threaded hole is also provided on the base. A lead screw is provided below the connecting frame, and the lead screw is connected to a lead screw nut in the threaded hole. Connecting plates are provided at both ends of the lead screw along the axial direction, and the connecting plates are fixedly connected to the connecting frame. A second drive motor is fixedly connected to one of the connecting plates. The end of the lead screw away from the second drive motor along the axial direction is rotatably connected to the corresponding connecting plate, and the end of the lead screw close to the second drive motor along the axial direction passes through the corresponding connecting plate and is fixedly connected to the output shaft of the second drive motor.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are: by setting a fixed rotating component, this utility model can simultaneously achieve the effects of clamping and rotating the valve stem;

[0016] By fixing the rotating assembly and the detection assembly, the effect of circumferentially rotating the valve stem body to detect the bending point can be achieved.

[0017] By setting up a straightening component and cooperating with a detection component, a high-precision straightening effect on the valve stem can be achieved. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the fixed rotating component structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the disassembled structure of the fixed rotating component of this utility model;

[0022] Figure 4 This is a schematic diagram of the straightening component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of a portion of the straightening component of this utility model;

[0024] Figure 6 This is a schematic diagram of the detection component structure of this utility model;

[0025] Figure 7 This is a front cross-sectional view of a portion of the detection component structure of this utility model;

[0026] In the diagram: 1. Workbench; 2. Detection assembly; 3. Fixed rotation assembly; 4. Straightening assembly; 5. Fixing block; 6. Mounting hole; 7. Rotating ring; 8. External gear ring; 9. Annular groove; 10. Transmission cavity; 11. Drive motor one; 12. First gear; 13. Locking cavity; 14. Second gear; 15. Electromagnetic brake; 16. Hydraulic telescopic cylinder one; 17. Clamping block; 18. Base plate; 19. Hydraulic telescopic cylinder two; 20. Fixing tube; 21. Spring; 22. Probe; 23. Base; 24. Connecting frame; 25. Guide rail; 26. Slide groove; 27. Threaded hole; 28. Lead screw; 29. ​​Connecting plate; 30. Drive motor two; 31. Hydraulic telescopic cylinder three; 32. Top block. Detailed Implementation

[0027] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-7 The present invention provides a technical solution: a straightening device for valve stems, comprising a worktable 1, on which a detection component 2, a fixed rotation component 3 and a straightening component 4 are provided.

[0029] The fixed rotating assembly 3 includes two fixed blocks 5, and a mounting hole 6 is provided at the center of the two fixed blocks 5. The mounting holes 6 on the two fixed blocks 5 are coaxially arranged.

[0030] A rotating ring 7 is rotatably connected to each of the two mounting holes 6. An external gear ring 8 is fixedly connected to the outer ring side of the rotating ring 7. An annular groove 9 is opened on the inner wall of the mounting hole 6 corresponding to the external gear ring 8. A transmission cavity 10 is opened in the fixing block 5, and the transmission cavity 10 is connected to the annular groove 9.

[0031] Two fixed blocks 5 are fixedly connected to a drive motor 11 on one side of each other. The output shaft of the drive motor 11 passes through the transmission cavity 10 and is fixedly connected to a first gear 12. The first gear 12 meshes with the external gear ring 8, thereby driving the rotating ring 7 to rotate through the drive motor 11.

[0032] A locking cavity 13 is provided inside the fixing block 5. The locking cavity 13 is connected to the annular groove 9. A locking component is provided inside the locking cavity 13. The locking component is used to lock and fix the rotating ring 7.

[0033] The locking assembly includes a second gear 14, which is rotatably connected to the inner wall of the locking cavity 13. The second gear 14 meshes with the external gear ring 8. An electromagnetic brake 15 is fixedly connected to the outside of the fixing block 5. The shaft of the second gear 14 passes through the fixing block 5 and then enters the brake of the electromagnetic brake 15. The electromagnetic brake 15 is a conventional technology. The second gear 14 is braked and locked by the electromagnetic brake 15.

[0034] Three hydraulic telescopic cylinders 16 are installed in the inner ring of the rotating ring 7. The three hydraulic telescopic cylinders 16 are evenly distributed in a circle around the central axis of the rotating ring 7. The fixed ends of the three hydraulic telescopic cylinders 16 are fixedly connected to the inner ring wall of the rotating ring 7. The output ends of the three hydraulic telescopic cylinders 16 are all fixedly connected to clamping blocks 17, which are used to clamp and fix the valve stem.

[0035] The detection component 2 is set between two fixed blocks 5 and includes a base plate 18. Hydraulic telescopic cylinders 19 are provided at both ends of the lower side of the base plate 18 along its length direction. The fixed end of the hydraulic telescopic cylinder 19 is fixedly connected to the workbench 1, and the output end of the hydraulic telescopic cylinder 19 is fixedly connected to the base plate 18.

[0036] Several fixed tubes 20 are provided on the upper side of the base plate 18. The fixed tubes 20 are arranged linearly and evenly along the length of the base plate 18. A spring 21 is sleeved in each fixed tube 20. A probe 22 is abutted on the upper side of the spring 21. The probe 22 is slidably connected to the fixed tube 20. The upper end of the probe 22 passes through the fixed tube 20 and contacts the valve stem. A pressure sensor is abutted on the lower end of the spring 21. The pressure sensor is embedded in the fixed tube 20. The pressure sensor signal is connected to a processor.

[0037] The straightening assembly 4 includes a base 23, which is positioned above the detection assembly 2. A connecting frame 24 is fixedly connected to the upper side of the worktable 1. The connecting frame 24 is L-shaped, and two guide rails 25 are fixedly connected to the side of the connecting frame 24 opposite to the upper side of the worktable 1. The cross-sectional shape of the guide rails 25 is dovetail-shaped. The base 23 has a groove 26 corresponding to the guide rails 25. The groove 26 cooperates with the guide rails 25, so that the base 23 can slide along the guide rails 25.

[0038] A threaded hole 27 is provided on the base 23. A lead screw 28 is provided below the connecting frame 24. The lead screw 28 is connected to the lead screw nut in the threaded hole 27. A connecting plate 29 is provided at both ends of the lead screw 28 along the axial direction. The lead screw 28 is rotatably connected to the connecting plate 29. The connecting plate 29 is fixedly connected to the connecting frame 24. A drive motor 30 is fixedly connected to one of the connecting plates 29.

[0039] The end of the lead screw 28 away from the drive motor 30 along the axis is rotatably connected to the corresponding connecting plate 29, and the end of the lead screw 28 close to the drive motor 30 along the axis passes through the corresponding connecting plate 29 and is fixedly connected to the output shaft of the drive motor 30. In this way, the drive motor 30 drives the base 23 to move along the guide rail 25 through the lead screw 28.

[0040] A hydraulic telescopic cylinder 31 is fixedly connected to the side of the base 23 facing the workbench 1. A top block 32 is fixedly connected to the output end of the hydraulic telescopic cylinder 31. The top block 32 is used to press and straighten the bent part of the valve stem.

[0041] In this embodiment, the valve stem is inserted into two rotating rings 7, and the valve stem is clamped and fixed by the clamping blocks 17 inside the rotating rings 7.

[0042] Then, the output end of the hydraulic telescopic cylinder 19 is extended so that the probe on the base plate 18 contacts the valve stem. Subsequently, the selector ring is driven to rotate by the drive motor 11 through gear transmission. At this time, the electromagnetic brake 15 does not lock the second gear 14, and the second gear 14 rotates in conjunction with the external gear ring 8.

[0043] As the rotating ring 7 rotates, it drives the hydraulic telescopic cylinder 16 and the clamping block 17 to rotate synchronously, thereby driving the valve stem to rotate. During the rotation of the valve stem, the probe is always in contact with the valve stem body under the action of the spring 21.

[0044] After the valve stem is rotated one revolution, the processor determines, through online detection by several pressure sensors, that when the valve stem has rotated to a certain angle and the pressure value at a certain probe in the axial direction is significantly lower than the pressure at the other probes, it indicates that the valve stem has the maximum upward bending at that position.

[0045] Subsequently, the valve stem is rotated to the same angle again by the fixed rotating assembly 3, and the operation of the drive motor 11 is stopped. At the same time, the second gear 14 is locked by the electromagnetic brake 15, thereby restricting and fixing the external gear ring 8 by the second gear 14, so that the valve stem cannot rotate.

[0046] Then, control the drive motor 30 to run, so that the base 23 slides along the guide rail 25 to the axis position corresponding to the bend of the valve stem. Then, control the output end of the hydraulic telescopic cylinder 31 to extend, so that the top block 32 presses against the bend of the valve stem. When the pressure sensor at this position detects through the feedback of the probe that the pressure difference with the other probes is within the safe range, the straightening of the valve stem is completed.

[0047] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", 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 utility model 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 utility model.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A straightening device for valve stems, characterized in that: The system includes a workbench (1), on which a detection component (2), a fixed rotation component (3), and a straightening component (4) are provided. The detection component (2) includes a liftable base plate (18). Several fixed tubes (20) arranged linearly are provided on the upper side of the base plate (18). A spring (21) is sleeved in each fixed tube (20). A probe abuts against the upper side of the spring (21). The probe is slidably connected to the fixed tube (20). The upper end of the probe passes through the fixed tube (20) and contacts the valve stem. A pressure sensor abuts against the lower end of the spring (21). The pressure sensor signal is connected to a processor.

2. The straightening device for valve stems according to claim 1, characterized in that: The fixed rotating assembly (3) includes two fixed blocks (5), and the detection assembly (2) is disposed between the two fixed blocks (5). An installation hole (6) is provided at the center of the two fixed blocks (5). A rotatable rotating ring (7) is fitted inside the two installation holes (6). Three hydraulic telescopic cylinders (16) are provided in the inner ring of the rotating ring (7). The output ends of the three hydraulic telescopic cylinders (16) are all fixedly connected to clamps (17).

3. A straightening device for valve stems according to claim 2, characterized in that: An external gear ring (8) is fixedly connected to the outer ring side of the rotating ring (7). An annular groove (9) is opened in the inner wall of the mounting hole (6) corresponding to the external gear ring (8). A transmission cavity (10) is opened in the fixed block (5). The transmission cavity (10) is connected to the annular groove (9). A drive motor (11) is fixedly connected to one side of each of the two fixed blocks (5). The output shaft of the drive motor (11) passes through the transmission cavity (10) and is fixedly connected to a first gear (12). The first gear (12) meshes with the gear of the external gear ring (8).

4. A straightening device for a valve stem according to claim 3, characterized in that: A locking cavity (13) is provided inside the fixed block (5). The locking cavity (13) is connected to the annular groove (9). A locking assembly is provided inside the locking cavity (13). The locking assembly includes a second gear (14). The second gear (14) is rotatably connected to the inner wall of the locking cavity (13). The second gear (14) meshes with the external gear ring (8). An electromagnetic brake (15) is fixedly connected to the outside of the fixed block (5). The shaft of the second gear (14) passes through the fixed block (5) and then enters the brake of the electromagnetic brake (15).

5. A straightening device for a valve stem according to claim 4, characterized in that: Hydraulic telescopic cylinders (19) are provided at both ends of the lower side of the base plate (18) along its length direction. The fixed end of the hydraulic telescopic cylinder (19) is fixedly connected to the workbench (1), and the output end of the hydraulic telescopic cylinder (19) is fixedly connected to the base plate (18).

6. A straightening device for a valve stem according to claim 5, characterized in that: The straightening component (4) is positioned directly above the detection component (2). The straightening component (4) includes a base (23). A hydraulic telescopic cylinder (31) is fixedly connected to the side of the base (23) facing the workbench (1). A top block (32) is fixedly connected to the output end of the hydraulic telescopic cylinder (31).

7. A straightening device for a valve stem according to claim 6, characterized in that: A connecting frame (24) is fixedly connected to the upper side of the workbench (1). Two guide rails (25) are fixedly connected to the connecting frame (24) on the opposite side of the upper side of the workbench (1). A sliding groove (26) is provided on the base (23) corresponding to the guide rail (25). The sliding groove (26) cooperates with the guide rail (25). A threaded hole (27) is also provided on the base (23). A lead screw (28) is provided below the connecting frame (24). The lead screw (28) is connected to the lead screw nut in the threaded hole (27). The lead screw (28) is provided with connecting plates (29) at both ends along the axial direction. The connecting plates (29) are fixedly connected to the connecting frame (24). A second drive motor (30) is fixedly connected to one of the connecting plates (29). The end of the lead screw (28) away from the second drive motor (30) along the axial direction is rotatably connected to the corresponding connecting plate (29). The end of the lead screw (28) close to the second drive motor (30) along the axial direction passes through the corresponding connecting plate (29) and is fixedly connected to the output shaft of the second drive motor (30).

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