Valve rod straightness detection device

Abstract

The utility model discloses a valve rod straightness detection device, which comprises a horizontal operation platform, two clamping assemblies and a detection assembly, the two clamping assemblies are oppositely arranged, each clamping assembly comprises a fixed clamping piece and a movable clamping piece, the fixed clamping pieces are fixedly connected with the operation platform, the movable clamping pieces are slidably connected with the operation platform, and the detection assembly is arranged on the operation platform. An elastic piece is telescopically arranged between the movable clamping piece and the operation platform in the moving direction of the movable clamping piece, the two ends of the valve rod are clamped between the fixed clamping piece and the movable clamping piece, the detection assembly is installed on the operation platform and located on one side of the movable clamping piece, and the detection assembly comprises a dial indicator. The measuring head of the dial indicator abuts against the surface of the valve rod and can move in the axial direction of the valve rod, the valve rod is transversely arranged, the two ends of the valve rod are clamped and fixed, the clamping stability of the valve rod is improved, the accuracy of the detection result is high, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of valve detection devices, and in particular to a valve stem straightness detection device. Background Art

[0002] Valves are used to input air into the engine and discharge the exhaust gas after combustion. A valve includes a valve head and a valve stem. To ensure the production quality of the valve, it is usually necessary to detect the straightness of the valve stem after the valve is produced. Currently, the detection methods for the straightness of the valve stem mainly include using a dial indicator for detection and a flat plate for detection. The dial indicator detection method is to slide the dial indicator on the surface of the valve stem, and measure the straightness of the valve stem through the swing difference of the dial indicator. The flat plate detection method is to roll the valve stem on the edge of the flat plate, and at the same time use a feeler gauge to measure the gap between the valve stem and the flat plate. The size of this gap directly reflects the straightness of the valve stem. Compared with the flat plate detection method, the dial indicator detection method is simple to operate and has high efficiency, and has gradually become the main detection method in this industry.

[0003] The Chinese utility model patent document with the publication number CN215114367U discloses a device for detecting the straightness of a valve stem, which records a valve fixing assembly including a clamping piece and a placing table. A clamping groove is provided at the top of the placing table and is fixedly connected to the support table; a guiding hole is provided in the placing table, and the clamping piece is located at the top of the placing table and is matched with the placing table through a guiding column; a stop piece is installed at the bottom of the guiding column, and a spring is installed between the stop piece and the placing table. During operation, after the valve head is pushed into the clamping groove, it can be clamped and fixed by the clamping piece, and further a micrometer is used to measure the straightness of the valve stem. In the above method of fixing the valve, the valve is in a vertical state, and only the lower valve head is clamped and fixed. During actual detection, when there are large machining and assembly errors in the parts clamping and fixing the valve head part, under the resistance of the micrometer, it may cause the bottom valve head to move, resulting in a decrease in the clamping stability of the valve head, and the valve stem is prone to move, thus affecting the accuracy of the detection result. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that in the prior art, the valve stem is prone to move during the straightness detection, resulting in low detection accuracy. Based on this, the utility model provides a valve stem straightness detection device with high detection accuracy.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows: A valve stem straightness detection device includes a horizontal operation platform, a clamping assembly, and a detection assembly. There are two clamping assemblies which are arranged oppositely. The clamping assembly includes a fixed clamping piece and a movable clamping piece. The fixed clamping piece is fixedly connected to the operation platform. The movable clamping piece is slidably connected to the operation platform. An elastic member is telescopically arranged between the movable clamping piece and the operation platform along the moving direction of the movable clamping piece. Both ends of the valve stem are clamped between the fixed clamping piece and the movable clamping piece. The detection assembly is installed on the operation platform and is located on one side of the movable clamping piece. The detection assembly includes a dial indicator, and the measuring head of the dial indicator abuts against the surface of the valve stem and can move along the axial direction of the valve stem.

[0006] Further, a chute is provided on the operation platform, and the movable clamping piece is slidably arranged in the chute. Convex strips protrude outward from opposite sides of the movable clamping piece, and guide grooves are formed on the groove walls of the chute. The convex strips are slidably connected to the guide grooves.

[0007] Further, one end of the elastic member elastically abuts against the side wall of the chute, and the other end of the elastic member elastically abuts against the side of the movable clamping piece away from the fixed clamping piece.

[0008] Further, arc-shaped grooves are formed on the opposite surfaces of the fixed clamping piece and the movable clamping piece, and the arc-shaped grooves are adapted to the circumferential surface of the valve stem.

[0009] Further, inclined surfaces are provided above the arc-shaped grooves on the opposite surfaces of the fixed clamping piece and the movable clamping piece, and the arc-shaped grooves are smoothly connected to the inclined surfaces.

[0010] Further, the valve stem straightness detection device further includes a first limiting plate and a second limiting plate which are parallel to each other. The two clamping assemblies are arranged between the first limiting plate and the second limiting plate. The first limiting plate is fixedly connected to the operation platform. The second limiting plate is slidably connected to the operation platform. Both ends of the valve abut against the first limiting plate and the second limiting plate respectively.

[0011] Further, a U-shaped block is fixedly connected to the upper surface of the operation platform. The opening of the U-shaped block faces the first limiting plate. The second limiting plate is slidably arranged in the opening of the U-shaped block, and a spring is provided between the second limiting plate and the U-shaped block.

[0012] Further, the detection assembly further includes a slider. The dial indicator is installed on the slider, and the slider is slidably arranged on the operation platform along the axial direction of the valve stem.

[0013] Further, a fixed sleeve is fixedly installed on the slider. The central axis of the fixed sleeve is perpendicular to the axis of the valve stem. The sleeve of the dial indicator is slidably inserted through the fixed sleeve. A locking bolt is threadedly connected to the side wall of the fixed sleeve. One end of the locking bolt passes through the fixed sleeve and abuts against the sleeve on the dial indicator.

[0014] The beneficial effects of the present utility model are as follows: For the valve stem straightness detection device provided by the present utility model, both ends of the valve stem are clamped and fixed between the fixed clip and the movable clip, which improves the clamping stability of the valve stem and avoids the situation where the valve stem moves easily. At the same time, the valve stem is clamped and fixed by the elastic force of the elastic member, and the operation is simple and convenient, which is beneficial for the user to quickly clamp the valve stem. In addition, the detection component is located on one side of the movable clip. In this way, when the detection head of the dial indicator abuts against the valve stem, the valve stem will press against the fixed clip, without affecting the position of the movable clip, thereby further ensuring the clamping stability of the valve stem, with strong use reliability and high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is a perspective view of the valve stem straightness detection device of the present utility model;

[0017] Figure 2 is Figure 1 the top view of the shown valve stem straightness detection device.

[0018] In the figure: 1, operating platform, 11, chute, 111, guide groove, 12, U-shaped block, 13, spring, 14, groove, 2, clamping assembly, 21, fixed clip, 210, arc groove, 220, inclined surface, 22, movable clip, 221, rib, 23, elastic member, 3, first limit plate, 4, second limit plate, 5, detection assembly, 51, dial indicator, 52, slider, 53, fixed sleeve, 54, locking bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Now the present utility model will be described in detail in conjunction with the drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic manner, so it only shows the components related to the present utility model.

[0020] Please refer to Figure 1 , Figure 2, the present utility model provides a device for detecting the straightness of a valve stem, which includes an operation platform 1, a clamping assembly 2, a first limiting plate 3, a second limiting plate 4 and a detection assembly 5. There are two clamping assemblies 2 which are arranged oppositely and are located between the first limiting plate 3 and the second limiting plate 4. The two ends of the valve are respectively abutted against the first limiting plate 3 and the second limiting plate 4. The clamping assembly 2 includes a fixed clip 21 and a movable clip 22. The fixed clip 21 is fixedly connected to the operation platform 1, and the movable clip 22 is slidably connected to the operation platform 1. An elastic member 23 is telescopically arranged between the movable clip 22 and the operation platform 1 along the moving direction of the movable clip 22. The two ends of the valve stem are clamped between the fixed clip 21 and the movable clip 22. The detection assembly 5 is installed on the operation platform 1 and is located on one side of the movable clip 22. The detection assembly 5 includes a dial indicator 51, and the measuring head of the dial indicator 51 abuts against the surface of the valve stem and can move along the axial direction of the valve stem.

[0021] When using the device for detecting the straightness of the valve stem of the present utility model, place the valve horizontally. Under the action of an external force, the movable clip 22 compresses the elastic member 23 and moves away from the fixed clip 21, and finally the two ends of the valve stem are clamped between the fixed clip 21 and the movable clip 22. Then adjust the position of the dial indicator 51 so that the measuring head of the dial indicator 51 abuts against the surface of the valve stem. Next, move the dial indicator 51 along the axial direction of the valve stem. During this process, judge whether the straightness of the valve stem meets the usage requirements by observing the swing difference of the dial indicator 51.

[0022] During the above detection process, the two ends of the valve stem are clamped and fixed between the fixed clip 21 and the movable clip 22, which improves the clamping stability of the valve stem and avoids the situation that the valve stem moves easily. At the same time, the valve stem is clamped and fixed by the elastic force of the elastic member 23, and the operation is simple and convenient, which is beneficial for the user to quickly clamp the valve stem. In addition, the detection assembly 5 is located on one side of the movable clip 22. In this way, when the detection head of the dial indicator 51 abuts against the valve stem, the valve stem will press against the fixed clip 21 and will not affect the position of the movable clip 22, thereby further ensuring the clamping stability of the valve stem, with strong use reliability and high detection accuracy.

[0023] In this embodiment, a chute 11 is opened on the operation platform 1, and the movable clip 22 is slidably arranged in the chute 11. Convex strips 221 protrude outward from the opposite sides of the movable clip 22. Guide grooves 111 are opened on the groove walls of the chute 11, and the convex strips 221 are slidably connected to the guide grooves 111. When the movable clip 22 slides along the chute 11, the convex strips 221 can simultaneously slide along the guide grooves 111. The cooperation between the convex strips 221 and the guide grooves 111 can prevent the movable clip 22 from disengaging from the chute 11.

[0024] Further, one end of the elastic member 23 elastically abuts against the groove side wall of the sliding groove 11, and the other end of the elastic member 23 elastically abuts against the side of the movable clip 22 away from the fixed clip 21. In a specific embodiment, the elastic member 23 is a spring. In other embodiments, the elastic member 23 can also be, for example, a stainless steel shrapnel or a copper shrapnel, which is not limited herein.

[0025] Arc-shaped grooves 210 are formed on the opposite surfaces of the fixed clip 21 and the movable clip 22. The arc-shaped grooves 210 are adapted to the circumferential surface of the valve stem to be measured, so that the valve stem can be fully clamped between the fixed clip 21 and the movable clip 22. Further, inclined surfaces 220 are provided above the arc-shaped grooves 210 on the opposite surfaces of the fixed clip 21 and the movable clip 22. The arc-shaped grooves 210 and the inclined surfaces 220 are smoothly connected in a transitional manner. In this way, when the valve stem is not clamped, the user presses down the valve stem, and the valve stem will force the movable clip 22 to move under the action of the inclined surface 220, so that the fixed clip 21 and the movable clip 22 gradually move away, and finally the valve stem is clamped between the two. When it is necessary to remove the valve stem after the detection is completed, the user directly lifts the valve stem upward in a straight line, which can force the movable clip 22 to move, and thus the valve stem can be taken out. In the above process, the automatic picking and placing of the valve stem can be realized through the pressing and lifting actions, the operation is simple, and the detection efficiency is improved.

[0026] The first limiting plate 3 is fixedly connected to the operation platform 1, the second limiting plate 4 is slidably connected to the operation platform 1, the first limiting plate 4 and the second limiting plate 3 are parallel to each other, and the second limiting plate 4 can move away from or close to the first limiting plate 3. When the two ends of the valve stem are clamped between the fixed clip 21 and the movable clip 22, the user can move the second limiting plate 4 to make the second limiting plate 4 move towards the first limiting plate 3, so as to clamp the valve between the first limiting plate 3 and the second limiting plate 4. The first limiting plate 3 and the second limiting plate 4 act together to limit the valve from moving along its own axial direction, ensuring that the valve will not move easily during the detection process.

[0027] Further, a U-shaped block 12 is fixedly connected to the upper surface of the operation platform 1. The opening of the U-shaped block 12 faces the first limiting plate 3. The second limiting plate 4 is slidably installed in the opening of the U-shaped block 12. A spring 13 is arranged between the second limiting plate 4 and the U-shaped block 12. The spring 13 can expand and contract along the moving direction of the second limiting plate 4. One end of the spring 13 is fixedly connected to the second limiting plate 4, and the other end of the spring 13 is fixedly connected to the side wall of the opening of the U-shaped block 12. In this way, under the elastic force of the spring 13, the second limiting plate 4 can be pushed to push the valve against the first limiting plate 3, thus facilitating the user's operation.

[0028] The detection component 5 further includes a slider 52, and the dial indicator 51 is installed on the slider 52. The slider 52 is slidably arranged on the operation platform 1 along the axial direction of the valve stem. When the slider 52 moves, it can drive the dial indicator 51 thereon to move. In this embodiment, a groove 14 is formed on the upper surface of the operation platform 1. The groove 14 is in a long strip structure, and the slider 52 is slidably arranged in the groove 14 along the length direction of the groove 14. Specifically in implementation, the slider 52 can be moved by relying on the pushing action of a cylinder connected to the operation platform 1, or can be moved by relying on a screw drive mechanism, which is not limited herein.

[0029] Further, a fixed sleeve 53 is fixedly installed on the slider 52. The central axis of the fixed sleeve 53 is perpendicular to the axis of the valve stem. The sleeve of the dial indicator 51 is slidably penetrated through the fixed sleeve 53. A locking bolt 54 is threadedly connected to the side wall of the fixed sleeve 53. One end of the locking bolt 54 passes through the fixed sleeve 53 and abuts against the sleeve on the dial indicator 51, so as to fix the dial indicator 51 on the fixed sleeve 53. When in use, the user can loosen the locking bolt 54, adjust the position of the dial indicator 51 to make the measuring head of the dial indicator 51 abut against the surface of the valve stem, and then lock the locking bolt 54 to lock the dial indicator 51 on the fixed sleeve 53.

[0030] Taking the above ideal embodiment according to the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A valve stem straightness detection device, characterized in that: It includes a horizontal operating platform, a clamping assembly and a detection assembly. The clamping assembly has two and is arranged opposite to each other. The clamping assembly includes a fixed clip and a movable clip. The fixed clip is fixedly connected to the operating platform, and the movable clip is slidably connected to the operating platform. An elastic member is telescopically provided between the movable clip and the operating platform along the movable direction of the movable clip. Both ends of the valve stem are clamped between the fixed clip and the movable clip. The detection assembly is installed on the operating platform and is located on one side of the movable clip. The detection assembly includes a dial indicator. The measuring head of the dial indicator is abutted against the surface of the valve stem and can move along the axial direction of the valve stem.

2. The valve stem straightness detection device according to claim 1, characterized in that: The operating platform is provided with a slide groove, the movable clamp is slidably arranged in the slide groove, the movable clamp has convex strips protruding outwards on two opposite sides, a guide groove is opened on the groove wall of the slide groove, and the convex strip is slidably connected to the guide groove.

3. The valve stem straightness detection device according to claim 2, characterized in that: One end of the elastic member is elastically pressed against the groove side wall of the sliding groove, and the other end of the elastic member is elastically pressed against a side of the movable clip away from the fixed clip.

4. The valve stem straightness detection device according to claim 1, characterized in that: The fixed clip and the movable clip are both provided with arc grooves on their opposite surfaces, and the arc grooves are matched with the circumferential surface of the valve stem.

5. The valve stem straightness detection device according to claim 4, characterized in that: Inclined surfaces are provided on the opposite surfaces of the fixed clip and the movable clip and are located above the arc-shaped groove, and the arc-shaped groove and the inclined surface are smoothly transitionally connected.

6. The valve stem straightness detection device according to claim 1, characterized in that: The valve stem straightness detection device also includes a first limit plate and a second limit plate parallel to each other, the two clamping assemblies are arranged between the first limit plate and the second limit plate, the first limit plate is fixedly connected to the operating platform, and the second limit plate is slidably connected to the operating platform, and the two ends of the valve are respectively abutted against the first limit plate and the second limit plate.

7. The valve stem straightness detection device according to claim 6, characterized in that: A U-shaped block is fixedly connected to the upper surface of the operating platform, the opening of the U-shaped block faces the first limiting plate, the second limiting plate is slidably disposed in the opening of the U-shaped block, and a spring is disposed between the second limiting plate and the U-shaped block.

8. The valve stem straightness detection device according to claim 1, characterized in that: The detection assembly also includes a sliding block, the dial indicator is mounted on the sliding block, and the sliding block is slidably disposed on the operating platform along the axial direction of the valve stem.

9. The valve stem straightness detection device according to claim 8, characterized in that: A fixing sleeve is fixedly installed on the sliding block, the central axis of the fixing sleeve is perpendicular to the axis of the valve stem, the sleeve of the dial indicator can be slidably passed through the fixing sleeve, a locking bolt is threadedly connected to the side wall of the fixing sleeve, and one end of the locking bolt passes through the fixing sleeve and abuts against the sleeve on the dial indicator.

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