Positioning fixture for pipeline surface inspection

Abstract

The utility model discloses a kind of positioning clamps for pipeline surface detection, belong to pipeline positioning equipment technical field, including guide structure, multiple sets of clamping structure, drive structure and multiple sets of locking structure;The guide structure includes base, fixed type guide disc fixed in the top of base, simultaneously penetrating the transmission shaft of base and fixed type guide disc and being fixed in the top of transmission shaft and being located in the top of fixed type guide disc movable guide disc, the movable guide disc and fixed type guide disc are all set up on and have multiple circumferential array distribution and the guide groove of opposite direction, each clamping structure is sequentially concentrically located in the intersection groove formed by movable guide disc guide groove and fixed type guide disc guide groove, all clamping structures can be driven along guide groove synchronous sliding by rotating movable guide disc.The positioning clamp is optimized by guide structure and drive mode, realizes the synchronous contraction or expansion of all clamping structures, improves clamping efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline positioning equipment, specifically a positioning fixture for pipeline surface inspection. Background Technology

[0002] In pipeline surface inspection (such as weld flaw detection), it is often necessary to fix and adjust the pipeline to a suitable position using clamps so that the inspection equipment can scan and inspect the pipeline surface. In existing technologies, pipeline clamps mostly adopt single-point or multi-point independent clamping structures, requiring individual adjustment of the position of each clamp to fit the pipeline size, which has the following drawbacks: Low adjustment efficiency: Each gripper needs to be operated individually, which is time-consuming, especially in scenarios involving multiple pipe diameters or multiple batches of testing, which seriously affects work efficiency; Poor synchronization: Independent adjustment can easily lead to deviations in the position of each gripper, causing the pipe to be clamped at an angle and affecting the detection accuracy; Complex operation: Additional tools (such as wrenches) are required to tighten each clamp individually, making it difficult to complete the clamping action quickly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a positioning fixture for pipeline surface inspection. By optimizing the guiding structure and driving method, the synchronous contraction or expansion of all clamping structures is achieved, thereby improving clamping efficiency and accuracy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A positioning fixture for pipe surface inspection includes a guide structure, multiple sets of clamping structures that slide within the guide structure, a drive structure concentrically connected to the bottom of the guide structure, and multiple sets of locking structures installed on the sides of the guide structure and acting on the guide structure. The guide structure includes a base, a fixed guide plate fixed above the base, a drive shaft passing through both the base and the fixed guide plate, and a movable guide plate fixed at the top of the drive shaft and directly above the fixed guide plate. Both the movable and fixed guide plates have multiple circumferentially arrayed guide grooves in completely opposite directions. Each set of clamping structures is concentrically located within an intersecting groove formed by the guide grooves of the movable and fixed guide plates. By rotating the movable guide plate, all clamping structures can be driven to slide synchronously along the guide grooves.

[0005] By adopting the above scheme, the positioning fixture uses the intersecting guide grooves of the movable guide plate and the fixed guide plate to guide the synchronous sliding of all clamping structures by rotating the movable guide plate, thereby achieving synchronous contraction or expansion of the clamping structures. By optimizing the guide structure and driving method, synchronous adjustment of all clamping structures can be achieved, thus greatly improving clamping efficiency and accuracy.

[0006] In a preferred embodiment of a positioning clamp for pipe surface inspection, the guide groove on the movable guide plate is an arc-shaped guide groove one, with at least four arc-shaped guide grooves, all of which are arranged in a clockwise circumferential array along the movable guide plate; the guide groove on the fixed guide plate is an arc-shaped guide groove two, with the same number of arc-shaped guide grooves as the arc-shaped guide groove one, all of which are arranged in a counterclockwise circumferential array along the fixed guide plate; the directions of the above arc-shaped guide grooves are opposite to ensure that the clamping structure slides synchronously inward or outward during rotation.

[0007] As a preferred embodiment of a positioning fixture for pipe surface inspection, the clamping structure includes a vertical shaft that is vertically confined within a guide groove, a limiting nut threaded onto the vertical shaft, and at least two clamping wheels arranged in an array along the axial direction of the vertical shaft and rotatably mounted on the vertical shaft. The limiting nut helps the vertical shaft maintain a vertical state when sliding along the guide groove, thereby preventing the vertical shaft from tilting. The sides of the clamping wheels are covered with anti-slip sleeves (such as rubber sleeves). The upper and lower parts of each clamping wheel are respectively threaded onto the vertical shaft with adjusting nuts to fix the position of the clamping wheel on the vertical shaft and prevent it from sliding vertically.

[0008] As a preferred embodiment of a positioning fixture for pipeline surface inspection, the drive structure includes a driven gear concentrically connected to the bottom end of the drive shaft, a driving gear meshing with the driven gear, and a drive wheel (such as a handwheel) concentrically connected to the driving gear; wherein the diameter of the driving gear is smaller than the diameter of the driven gear, and the driving gear and the driven gear together constitute a reduction gear set, which amplifies the torque and facilitates manual operation.

[0009] As a preferred embodiment of a positioning clamp for pipe surface inspection, the locking structure includes multiple sets of locking blocks fixed to the side of a fixed guide plate and arranged in a circumferential array, and set screws threaded through the locking blocks. The top of the set screw can abut against the side of a movable guide plate. By rotating the set screw to abut against the movable guide plate, the movable guide plate can be fixed. The side of the movable guide plate is provided with multiple circumferentially arrayed anti-slip textures to increase the friction during contact, prevent the set screw from slipping, and improve the stability of fixing the movable guide plate.

[0010] The beneficial effects of this utility model are: 1. Synchronous adjustment: Through the intersecting arc-shaped guide groove design of the movable guide plate and the fixed guide plate, rotating the movable guide plate can drive all clamping structures to slide synchronously, realizing the synchronous adjustment of multiple clamping wheels and greatly improving the adjustment efficiency. 2. Adaptive clamping: The clamping wheel and the vertical shaft are rotatably connected, which can adapt to the circumferential direction of the pipe. With the help of the anti-slip sleeve, the friction is enhanced and the damage to the pipe surface is avoided. 3. Stable and reliable: The locking structure uses a set screw and anti-slip texture to prevent the movable guide plate from loosening, and the nut is raised to lock the position of the clamping wheel to ensure stable clamping process; 4. Easy to operate: The drive structure uses a reduction gear set to amplify torque, and can be operated manually or electrically, reducing labor intensity. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional structural diagram of the positioning fixture; Figure 2 A three-dimensional structural diagram of the pipeline to be inspected after it has been fixed in place by the positioning fixture; Figure 3 A three-dimensional structural diagram to guide the structure; Figure 4 To hide Figure 3 A three-dimensional structural diagram of the central movable guide plate; Figure 5 To hide Figure 4 Three-dimensional structural diagram of the fixed guide plate in the middle; Figure 6 A three-dimensional structure for clamping Figure 1 ; Figure 7 A three-dimensional structure for clamping Figure 2 ; Figure 8 A three-dimensional structural diagram of the driving structure; Figure 9 for Figure 3 A magnified view of a section at point A in the middle; In the diagram, the markings are as follows: 1-Guiding structure; 101-Base; 102-Fixed guide plate; 103-Drive shaft; 104-Modible guide plate; 105-Arc-shaped guide groove one; 106-Arc-shaped guide groove two; 2-Clamping structure; 201-Vertical shaft; 202-Limit nut; 203-Clamping wheel; 204-Anti-slip sleeve; 205-Height adjustment nut; 3-Drive structure; 301-Driven gear; 302-Drive gear; 303-Drive wheel; 4-Locking structure; 401-Locking block; 402-Setting screw; 5-Pipe. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figures 1 to 5 As shown, a positioning fixture for pipe surface inspection is provided, which is used for positioning during the inspection of the outer surface of pipe 5 (weld flaw detection). Specifically, it includes a guide structure 1, multiple sets of clamping structures 2 that slide and are limited within the guide structure 1, a drive structure 3 concentrically connected to the bottom of the guide structure 1, and multiple sets of locking structures 4 installed on the sides of the guide structure 1 and acting on the guide structure 1. The guide structure 1 includes a base 101, a fixed guide plate 102 fixed above the base 101, and a clamp penetrating both the base 101 and the fixed guide plate 102. The fixture comprises a drive shaft 103 and a movable guide disk 104 fixed at the top of the drive shaft 103 and directly above the fixed guide disk 102. Both the movable guide disk 104 and the fixed guide disk 102 have multiple circumferentially arrayed guide grooves in opposite directions. Each clamping structure 2 is concentrically located within the intersecting groove formed by the guide grooves of the movable guide disk 104 and the fixed guide disk 102. Rotating the movable guide disk 104 drives all clamping structures 2 to slide synchronously along the guide grooves. This positioning fixture, through the intersecting guide design of the guide grooves of the movable guide disk 104 and the fixed guide disk 102, allows all clamping structures 2 to slide synchronously by rotating the movable guide disk 104, achieving synchronous contraction or expansion of the clamping structures 2. By optimizing the guide structure 1 and the driving method, synchronous adjustment of all clamping structures 2 is achieved, thereby greatly improving clamping efficiency and accuracy.

[0015] like Figures 3 to 5 As shown, the guide grooves on the movable guide plate 104 are arc-shaped guide grooves 105, with at least four arc-shaped guide grooves 105 (a total of four arc-shaped guide grooves 105 are shown in the figure). All arc-shaped guide grooves 105 are arranged in a clockwise circumferential array along the movable guide plate 104. The guide grooves on the fixed guide plate 102 are arc-shaped guide grooves 106, with the same number of arc-shaped guide grooves 106 as the number of arc-shaped guide grooves 105. All arc-shaped guide grooves 106 are arranged in a counterclockwise circumferential array along the fixed guide plate 102. The directions of the above arc-shaped guide grooves are opposite to ensure that the clamping structure 2 slides inward or outward synchronously during rotation.

[0016] like Figures 6 to 7As shown, the clamping structure 2 includes a vertical shaft 201 that is vertically limited within the guide groove, a limiting nut 202 that is threaded onto the vertical shaft 201, and at least two clamping wheels 203 arranged in an array along the axial direction of the vertical shaft 201 and rotatably mounted on the vertical shaft 201 (there are two clamping wheels 203 in the figure). The limiting nut 202 helps the vertical shaft 201 to remain vertical when sliding along the guide groove, thereby preventing the vertical shaft 201 from tilting to the side. The sides of the clamping wheels 203 are covered with anti-slip sleeves 204 (rubber sleeves). The upper and lower parts of each clamping wheel 203 are respectively threaded onto the vertical shaft 201 with adjusting nuts 205 to fix the position of the clamping wheel 203 on the vertical shaft 201 and prevent it from sliding vertically.

[0017] like Figure 8 As shown, the drive structure 3 includes a driven gear 301 concentrically connected to the bottom end of the transmission shaft 103, a drive gear 302 meshing with the driven gear 301, and a drive wheel 303 (handwheel) concentrically connected to the drive gear 302. The diameter of the drive gear 302 is smaller than the diameter of the driven gear 301. In this case, the drive gear 302 and the driven gear 301 together form a reduction gear set. The torque is amplified by the reduction gear set to achieve labor-saving adjustment. If automatic control is required, the drive wheel 303 can be replaced with an electric drive head (servo motor) to precisely control the rotation angle through the controller.

[0018] like Figure 9 As shown, the locking structure 4 includes multiple sets of locking blocks 401 fixed to the side of the fixed guide plate 102 and arranged in a circumferential array, and a set screw 402 threaded through the locking block 401. The top of the set screw 402 can abut against the side of the movable guide plate 104. By rotating the set screw 402 to abut against the movable guide plate 104, the movable guide plate 104 can be fixed, preventing the movable guide plate 104 from loosening due to the weight of the pipe 5 or the detection force. The side of the movable guide plate 104 is provided with multiple anti-slip textures arranged in a circumferential array to increase the friction when abutting, prevent the set screw 402 from sliding, and improve the stability of fixing the movable guide plate 104.

[0019] The working principle of this utility model: Initial positioning: Fix the base 101 on the testing platform, place the pipe 5 to be tested vertically between all the clamping rollers 203, manually or electrically rotate the drive wheel 303, and through the meshing transmission of the drive gear 302 and the driven gear 301, make the movable guide plate 104 rotate slowly. Through the intersection constraint of the arc guide groove 105, all the clamping rollers 203 are driven to contract or expand synchronously, and finally the clamping rollers 203 initially contact the outer wall of the pipe 5. The clamping rollers 203 adapt to the circumferential direction of the pipe 5 through the anti-slip sleeve 204, and the pressure is dispersed by multiple points of contact, ensuring that the pipe 5 is stably clamped and undamaged.

[0020] Synchronous locking: Rotate the set screw 402 to abut against the side of the fixed movable guide plate 104 to prevent the movable guide plate 104 from becoming loose.

[0021] Inspection operation: After clamping, the inspection equipment (ultrasonic flaw detector) can move or rotate along the 5-axis of the pipeline to perform a comprehensive inspection of the surface.

[0022] The above-mentioned methods achieve synchronous adjustment of multiple clamping wheels 203 through the intersection constraint of the arc-shaped guide groove, ensure clamping stability through the self-adaptive and multi-level locking structure 4 of the clamping wheels 203, reduce operating force and support precise control through gear transmission, and finally solve the problems of low adjustment efficiency, poor synchronization and complicated operation of traditional clamps.

[0023] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for pipeline surface inspection, comprising a guide structure, multiple sets of clamping structures that slide within the guide structure, a drive structure concentrically connected to the bottom of the guide structure, and multiple sets of locking structures installed on the side of the guide structure and acting on the guide structure; Its features are: The guiding structure includes a base, a fixed guide plate fixed above the base, a drive shaft passing through both the base and the fixed guide plate, and a movable guide plate fixed at the top of the drive shaft and located directly above the fixed guide plate. Both the movable and fixed guide plates have multiple circumferentially arrayed guide grooves in completely opposite directions. Each set of clamping structures is concentrically located in the intersecting groove formed by the guide grooves of the movable and fixed guide plates. By rotating the movable guide plate, all clamping structures can be driven to slide synchronously along the guide grooves.

2. The positioning fixture for pipeline surface inspection according to claim 1, characterized in that: The guide groove on the movable guide plate is an arc-shaped guide groove, and there are at least four arc-shaped guide grooves. All the arc-shaped guide grooves are arranged in a clockwise circumferential array along the movable guide plate.

3. The positioning fixture for pipe surface inspection according to claim 2, characterized in that, The guide groove on the fixed guide plate is an arc-shaped guide groove II. The number of arc-shaped guide groove II is the same as the number of arc-shaped guide groove I. All arc-shaped guide groove II are arranged in a counterclockwise circumferential array along the fixed guide plate.

4. The positioning fixture for pipeline surface inspection according to claim 1, characterized in that: The clamping structure includes a vertical shaft that is vertically limited within a guide groove, a limiting nut that is threaded onto the vertical shaft, and at least two clamping wheels that are arranged in an array along the axial direction of the vertical shaft and rotatably mounted on the vertical shaft.

5. The positioning fixture for pipe surface inspection according to claim 4, characterized in that, The sides of the clamping wheel are covered with anti-slip sleeves.

6. The positioning fixture for pipeline surface inspection according to claim 5, characterized in that, Each clamping wheel is threaded onto the vertical shaft with an adjusting nut at the top and bottom.

7. The positioning fixture for pipe surface inspection according to claim 1, characterized in that, The drive structure includes a driven gear concentrically connected to the bottom end of the transmission shaft, a driving gear meshing with the driven gear, and a drive wheel concentrically connected to the driving gear.

8. The positioning fixture for pipeline surface inspection according to claim 7, characterized in that, The diameter of the driving gear is smaller than the diameter of the driven gear.

9. The positioning fixture for pipe surface inspection according to claim 1, characterized in that, The locking structure includes multiple sets of locking blocks fixed to the side of the fixed guide plate and arranged in a circumferential array, and a set screw threaded through the locking blocks, wherein the top of the set screw can abut against the side of the movable guide plate.

10. The positioning fixture for pipeline surface inspection according to claim 9, characterized in that, The side of the movable guide plate is provided with multiple circumferentially arrayed anti-slip textures.

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