Device and method for measuring abrasion amount of spray needle of impulse turbine

Abstract

The invention discloses a device and method for measuring the abrasion amount of a spray needle of an impulse turbine, and the device comprises a fixed platform which is used for placing the spray needle to be measured, and the spray needle to be measured is provided with a plurality of points to be measured; the inner and outer slide rails are arranged at the top of the fixed platform, are positioned on the outer side of the to-be-measured spray needle and axially coincide with the to-be-measured spray needle; the rotating platform is in sliding connection with the inner and outer sliding rails and can rotate around the to-be-measured spray needle; the telescopic platform is arranged at the top of the rotating platform, and the end, away from the rotating platform, of the telescopic platform is connected with an inclined platform; the distance measuring probe system is detachably connected to the inclined platform, and the measuring end of the distance measuring probe system faces the to-be-measured spray needle; the measuring device is combined with a multi-degree-of-freedom adjusting mechanism to realize accurate positioning and vertical alignment of the probe, then the probe system is used for reading the displacement and deducting the thickness of the sleeve to obtain the real abrasion depth, non-destructive high-precision abrasion amount detection of any point of a complex curved surface can be realized, and the measuring device is suitable for a hydropower station overhaul site.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of impulse water turbines, and particularly relates to an impulse water turbine jet needle abrasion amount measuring device and method. BACKGROUND

[0002] Impulse water turbines are widely used in high water head and high sediment water power station environments. The core component, the jet needle, is easily abraded on the surface under long-term scouring of high-speed sediment-containing water flow, thereby affecting the jet flow pattern and the operation efficiency of the unit. In order to master the abrasion state of the jet needle, the existing technology mainly relies on numerical simulation and laboratory tests. Numerical simulation usually uses simulation software to predict the abrasion of the jet needle head under high-speed jet flow conditions, and estimates the abrasion distribution by setting boundary conditions and material properties. Experimental research is mostly focused on flow characteristic analysis, but lacks high-precision and repeatable measuring means for local abrasion amount of the jet needle surface. However, due to the complexity of the actual working conditions and the strong randomness of the movement of sediment particles, the simulation model is difficult to accurately restore the real abrasion process, resulting in a large deviation between the calculation results and the actual measurement. At the same time, there is currently no special equipment that can accurately measure the abrasion depth of any point on the curved surface of the jet needle, especially in the maintenance site, there is a lack of portable and reliable quantitative detection tools, which cannot effectively support the maintenance decision of the jet needle and affect the safe and stable operation of the unit. SUMMARY

[0003] The purpose of the present application is to provide an impulse water turbine jet needle abrasion amount measuring device and method to overcome the technical defects that the existing technology cannot perform high-precision and repeatable measurement on the abrasion amount of any point on the surface of the jet needle head and the straight jet pipe.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions: The first aspect of the present application provides an impulse water turbine jet needle abrasion amount measuring device, comprising: A fixed platform for placing a jet needle to be measured, the jet needle to be measured having a plurality of measurement points to be measured thereon: Inner and outer sliding rails arranged on the top of the fixed platform and located on the outer side of the jet needle to be measured, axially coinciding with the jet needle to be measured: A rotating platform slidably connected to the inner and outer sliding rails and capable of rotating around the jet needle to be measured; A telescopic platform arranged on the top of the rotating platform, one end of the telescopic platform away from the rotating platform being connected with an inclined platform; A distance measuring needle system detachably connected to the inclined platform, a measurement end of the distance measuring needle system facing the jet needle to be measured; A transparent conical sleeve is provided with a plurality of holes which are perpendicular to the axial direction of the transparent conical sleeve. When measuring the abrasion of the spray needle, the transparent conical sleeve is sleeved on the spray needle, the height between the measuring end and the measuring point is adjusted by the telescopic platform, and the measuring end is contacted with the measuring point by the tilting platform. In an alternative embodiment, the distance measuring probe system comprises: A wide straight slide rail is detachably arranged on the tilting platform, and the wide straight slide rail is provided with a first scale line at the end away from the tilting platform. A sliding table is slidably connected to the wide straight slide rail and can displace along the longitudinal direction of the wide straight slide rail. The top of the sliding table is connected to a distance measuring probe, and the distance measuring probe is axially parallel to the sliding table. A fixing knob is arranged on the top of the sliding table and below the distance measuring probe. The end of the fixing knob is movably connected to the wide straight slide rail. When the fixing knob is rotated, the position of the sliding table on the wide straight slide rail can be locked or unlocked. A probe screw knob, a probe distance measuring differential cylinder, and a probe distance measuring section are sequentially and spacedly arranged along the longitudinal direction of the distance measuring probe. When the probe screw knob is operated, the distance measuring probe can be driven to extend towards the hole and contact the measuring point through the hole. Alternatively, when the probe screw knob is operated, the distance measuring probe can be driven to retract from the hole and separate from the measuring point. The bottom of the tilting platform is connected to a tilting support. A base plate is detachably arranged on the top of the telescopic platform. A screw is arranged in the base plate, and a sliding block is connected to the outside of the screw. The sliding block is connected to the bottom of the tilting support. A support rod is rotatably connected to the base plate and connected to the tilting support at one end. A control rod is connected to the sliding block and can drive the sliding block to displace along the longitudinal direction of the screw to adjust the inclination angle of the tilting support.

[0005] In an alternative embodiment, the tilting platform has an L-shaped structure with a vertical end and a horizontal end. The wide straight slide rail is connected to the vertical end by a height control bolt and is axially parallel to the horizontal end. When the height control bolt is operated, the height of the wide straight slide rail fixed to the vertical end can be adjusted.

[0006] In an alternative embodiment, the control rod is connected to the end of the sliding block away from the spray needle to be measured. When the control rod is operated, the tilting support can be tilted towards the spray needle to be measured with the telescopic platform as the tilting center.

[0007] In an alternative embodiment, the telescopic platform comprises: A telescopic platform body; Two groups of telescopic rods are symmetrically arranged on the telescopic platform body. The telescopic joint is connected between the two groups of telescopic rods. In an alternative embodiment, a platform lifting knob is further included, which is fixedly connected to the telescopic platform body. When the platform lifting knob is rotated, the two groups of telescopic rods can drive the telescopic platform to move up and down.

[0008] In an alternative embodiment, the rotating platform comprises: The rotating platform body is provided at the bottom with two groups of support columns. The inner and outer sliding rails comprise a first sliding rail and a second sliding rail, both of which are annular structures, and the second sliding rail is located outside the first sliding rail and axially coincides with the first sliding rail. One group of support columns is in sliding connection with the first sliding rail, and the other group of support columns is in sliding connection with the second sliding rail. In an alternative embodiment, first bolt holes are formed in the two groups of support columns, and second bolt holes are formed in the first and second sliding rails. The first bolt holes and the second bolt holes are connected by lateral fixing bolts to position the rotating platform body. In an alternative embodiment, the to-be-measured spray needle comprises a spray needle head and a straight-flow nozzle, the spray needle head is arranged at the top of the straight-flow nozzle, the straight-flow nozzle is vertically arranged at the top of the fixed platform, and is connected with the fixed platform by a fixing bolt. The second aspect of the present application provides a method for measuring the surface abrasion amount of a spray needle, which is performed by using the impact water turbine spray needle abrasion amount measuring device of any one of the above-mentioned embodiments, and comprises the following steps: S1: fixing the to-be-measured spray needle at the center of the fixed platform; S2: rotating the rotating platform to a position below the measurement position and locking the position; S3: adjusting the height of the telescopic platform according to the height of the measurement position of the to-be-measured spray needle, and judging by sight that the ranging measuring needle and the measurement position are at the same height; S4: measuring the surface abrasion amount of the spray needle head, and sleeving the transparent conical sleeve on the surface of the spray needle head; S5: adjusting the angle of the inclined platform by operating the control rod, judging by sight that the ranging measuring needle is perpendicular to the surface of the spray needle head, and fixing the inclined support by adjusting the support rod after determining the inclination angle; S6: keep the distance measuring probe in the un-extended state, at this time the extended distance is zero, control the sliding table to move on the wide straight slide rail, and move the distance measuring probe into the hole; wherein, if the distance measuring probe cannot be completely moved into the hole and vertically attached to the inner surface of the transparent conical sleeve, repeat step S5 to finely adjust the angle of the inclined platform, and simultaneously adjust the vertical distance between the wide straight slide rail and the surface of the inclined platform, until the probe head can be completely vertically attached to the surface of the spray needle head, at this time the angle of the inclined platform is determined, and the position of the sliding table on the wide straight slide rail at this time is recorded; S7: move the sliding table to move the distance measuring probe out of the hole, and simultaneously remove the transparent conical sleeve from above the spray needle head; S8: move the sliding table to the position determined by the scale line on the slide rail in step S6, and repeat steps S2-S3 to finely adjust the position of the distance measuring probe, and simultaneously adjust the height of the wide straight slide rail on the inclined platform, until the distance measuring probe can completely coincide with the measuring point after being extended; At this time, rotate the threaded knob of the probe, until the distance measuring probe completely coincides with the measuring point on the surface of the spray needle head, read the extended distance value of the distance measuring probe and the number of rotation of the differential cylinder, obtain the reading of the probe at this time, and then subtract the thickness of the inner surface of the conical sleeve, to obtain the abrasion amount value of the measuring point; S9: when measuring other measuring points of the spray needle head, keep the angle of the inclined platform unchanged, at this time the distance measuring probe can be moved by the sliding table and vertically attached to the spray needle head, repeat steps S2-S3 and adjust the vertical distance between the wide straight slide rail and the surface of the inclined platform, to realize the abrasion measurement of different measuring points of the spray needle head: S10: when measuring the abrasion amount of the surface of the DC spray pipe, since the abrasion of the DC spray pipe is small, repeat steps S1-S3; wherein, in step S2, change to select to rotate the rotating platform to below the un-abraded part and fix by the lateral fixing bolt, at this time the angle of the inclined platform is zero, keep the distance measuring probe in the un-extended state, and control the sliding table to move on the wide straight slide rail until the distance measuring probe is in vertical contact with the surface of the DC spray pipe, and record the position of the sliding table on the wide straight slide rail at this time; S11: repeat steps S2-S3, move the sliding table to the position of the sliding table on the wide straight slide rail determined in step S10, rotate the threaded knob of the distance measuring probe, until the distance measuring probe completely coincides with the surface of the DC spray pipe, read the extended distance value of the distance measuring probe and the number of rotation of the differential cylinder, obtain the reading of the probe at this time, and then subtract the thickness of the inner surface of the conical sleeve, to obtain the abrasion amount value of the measuring point of the DC spray pipe; S12: repeat step S11, to realize the abrasion measurement of different measuring points of the DC spray pipe. Compared with the prior art, the present application has the following beneficial effects: The transparent conical sleeve is provided to simulate the geometric profile of the spray needle before wearing, and a plurality of fine holes vertical to the original surface are formed on the transparent conical sleeve to guide the ranging probe to contact the initial surface reference along the normal direction, so that a high-precision measurement reference is established; the circumferential positioning is realized by the rotating platform, the height is adjusted by the telescopic platform, and the spatial direction of the ranging probe is adjusted by the tilting platform, so that the ranging probe is always perpendicular to the measured curved surface; the ranging probe system has a micron-level resolution, and the position reproduction mechanism of the sliding table is matched to realize the repeatable and non-destructive measurement of the abrasion depth of any point of the spray needle head, solve the problem that the measurement result is unreliable due to large angle deviation and low precision in the traditional method, and significantly improve the accuracy and practicability of the spray needle abrasion evaluation. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0010] Figure 1 A measuring state schematic diagram of the impact type water turbine spray needle abrasion amount measuring device provided by the present application; Figure 2 A ranging probe system schematic diagram in the impact type water turbine spray needle abrasion amount measuring device provided by the present application; Figure 3 A top view of the impact type water turbine spray needle abrasion amount measuring device provided by the present application; Figure 4 A transparent conical sleeve schematic diagram in the impact type water turbine spray needle abrasion amount measuring device provided by the present application; In the figure: 1, spray needle head; 2, straight flow nozzle; 3, transparent conical sleeve; 4, fixing bolt; 5, inner and outer sliding rails; 6, rotating platform; 7, lateral fixing bolt; 8, telescopic platform; 9, telescopic rod, telescopic joint and internal hinge; 10, platform lifting knob; 11, control rod; 12, sliding block; 13, support rod; 14, tilting platform; 15, ranging probe system; 16, probe threaded knob; 17, ranging probe; 18, probe ranging differential cylinder; 19, probe distance measuring section; 20, wide straight sliding rail; 21, sliding table; 22, height control bolt; 23, sliding table knob; 24, fine hole. DETAILED DESCRIPTION

[0011] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0013] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0014] To solve the technical defects mentioned in the background art, the present embodiment provides a measuring device and method for the erosion amount of a jet needle of an impulse water turbine.

[0015] The present application will be described in further detail below in conjunction with the accompanying drawings: As Figures 1-4 shown, the first aspect of the embodiments of the present application provides a measuring device for the erosion amount of a jet needle of an impulse water turbine, comprising: a fixed platform, on which a jet needle to be measured is placed, and the jet needle to be measured has a plurality of measurement points; inner and outer slide rails 5, which are arranged on the top of the fixed platform and located on the outer side of the jet needle to be measured and axially coincide with the jet needle to be measured; a rotating platform 6, which is slidably connected to the inner and outer slide rails 5 and can rotate around the jet needle to be measured; an extension platform 8, which is arranged on the top of the rotating platform 6, and one end of the extension platform 8 away from the rotating platform 6 is connected with an inclined platform 14; a distance measuring needle system 15, which is detachably connected to the inclined platform 14, and the measurement end thereof faces the jet needle to be measured; a transparent conical sleeve 3, which has a plurality of fine holes 24 axially perpendicular to the transparent conical sleeve 3 on the outer side thereof, wherein, when measuring the erosion amount of the jet needle to be measured, the transparent conical sleeve 3 is sleeved on the outer side of the jet needle to be measured, the height between the measurement end and the plurality of measurement points is adjusted by the extension platform 8, and the measurement end is made to contact the measurement points through the fine holes 24 by the inclined platform 14.

[0016] In the above structure, the fixed platform is made of metal material, which has sufficient rigidity and levelness to ensure that there is no obvious deformation or vibration during the measurement process. The needle to be measured is vertically installed at the center position of the platform. The needle to be measured includes a needle head 1 and a straight flow pipe 2. The inner and outer slide rails 5 are arranged on the top of the fixed platform and arranged in a ring shape around the needle to be measured, and the axis thereof coincides with the axis of the needle.

[0017] The slide rails can be made of stainless steel material and subjected to precision grinding treatment on the surface to reduce friction resistance and prolong service life, so that the rotating platform 6 can slide stably thereon to realize 360° circumferential movement around the needle, thereby facilitating approaching any measurement point from different directions.

[0018] The telescopic platform 8 is arranged on the top of the rotating platform 6 and serves as a vertical adjustment unit for adjusting the height position of the distance measuring needle system 15. The telescopic platform 8 is realized by a mechanical telescopic structure to realize continuous lifting and lowering, and the adjustment range covers all axial positions of the measurement points from the top end of the needle head 1 to the lower part of the straight flow pipe 2.

[0019] The top of the telescopic platform 8 is connected with an inclined platform 14, which constitutes the basis support of the angle adjustment module. The inclined platform 14 is connected to the end of the telescopic platform 8, and its function is to adjust the spatial direction of the distance measuring needle 17 so that it can accurately aim at the measurement point and maintain the ideal contact angle, thereby changing the posture of the distance measuring needle system 15 installed thereon. Through this mechanism, the consistency control of the measurement end of the distance measuring needle 17 with the normal direction of the complex curved surface can be realized, and the measurement accuracy can be improved.

[0020] In the implementation, the distance measuring needle system 15 is detachably connected to the inclined platform 14, and the measurement end thereof faces the needle to be measured. The transparent conical sleeve 3 is specially matched with the shape of the needle head 1 in the un-worn state, is made of high-strength transparent engineering plastic (such as polycarbonate or acrylic), has good wear resistance and optical clarity, and the inner surface shape of the sleeve completely matches the initial geometric profile of the original needle head 1. The outer surface is provided with a plurality of fine holes 24, and the axis direction of the fine holes 24 is consistent with the normal of the local surface of the transparent conical sleeve 3, that is, perpendicular to the surface of the original needle head 1.

[0021] During measurement, the transparent conical sleeve 3 is sleeved outside the needle to be measured as a direction guide and reference, and the distance measuring needle 17 needs to pass through the corresponding fine hole 24 and contact the surface of the needle head 1, so as to ensure the consistency of the direction of each measurement and eliminate the angle error caused by human judgment.

[0022] In operation, the fixed platform provides a reference position, the inner and outer slide rails 5 and the rotating platform 6 realize circumferential positioning, the telescopic platform 8 completes axial height adjustment, the tilting platform 14 is responsible for spatial posture adjustment, the distance measuring probe system 15 performs final contact measurement, and the transparent conical sleeve 3 serves as a physical reproduction of the original geometric shape and is used to establish a measurement direction reference, thereby realizing high-precision erosion amount detection of any to-be-measured point on the surface of the impinging type water turbine jet needle.

[0023] In the scheme, the distance measuring probe system 15 comprises a wide straight slide rail 20, which is detachably arranged on the tilting platform 14 and has a first scale line at an end away from the tilting platform 14; a sliding table 21, which is slidingly connected to the wide straight slide rail 20 and can displace along the length direction of the wide straight slide rail 20, and the top of the sliding table 21 is connected with a distance measuring probe 17, which is axially parallel to the sliding table 21; a sliding table knob 23, which is arranged on the top of the sliding table 21 and below the distance measuring probe 17, and the end of the sliding table knob 23 is movably connected with the wide straight slide rail 20; wherein, when the sliding table knob 23 is rotated, the position of the sliding table 21 on the wide straight slide rail 20 can be locked or unlocked; a probe screw knob 16, a probe distance measuring differential cylinder 18 and a probe distance measuring section 19, the probe distance measuring section 19 has a second scale line at an end connected with the distance measuring probe 17, and the probe screw knob 16, the probe distance measuring differential cylinder 18 and the probe distance measuring section 19 are sequentially and spacedly arranged along the length direction of the distance measuring probe 17; wherein, when the probe screw knob 16 is operated to rotate, the distance measuring probe 17 can be driven to extend towards the fine hole 24 and contact the to-be-measured point through the fine hole 24; or, when the probe screw knob 16 is operated to rotate, the distance measuring probe 17 can be driven to retract from the fine hole 24 and separate from the to-be-measured point; the bottom of the tilting platform 14 is connected with a tilting support; a base plate, which is detachably arranged on the top of the telescopic platform 8, is provided with a screw rod, the outside of the screw rod is connected with a sliding block 12, and the sliding block 12 is connected with the bottom of the tilting support; a support rod 13, which is rotatably connected with the base plate, is connected with the tilting support at one end; and a control rod 11, which is connected with the sliding block 12, can drive the sliding block 12 to displace along the length direction of the screw rod to adjust the tilting angle of the tilting support.

[0024] The wide straight slide rail 20 serves as a guiding basic structure of the distance measuring probe system 15 and is used to provide a stable linear motion path for the sliding table 21, is made of high-strength metal material such as stainless steel or aluminum alloy, has good rigidity and wear resistance and can resist deformation in long-term use, has a long strip shape and extends along the axial direction, and is detachably mounted on the tilting platform 14 for easy maintenance and replacement.

[0025] A first scale line is arranged at the end away from the inclined platform 14, which is uniformly distributed along the length direction of the slide rail and can be used to quickly identify the current position of the sliding table 21 to assist the operator to achieve preliminary positioning. The scale line can be formed by laser engraving or mechanical scribing, and the minimum graduation value is 1mm. It can also be encrypted to 0.5mm according to the need to improve the positioning accuracy.

[0026] The sliding table 21 is slidingly connected to the wide straight slide rail 20 and can smoothly move along the length direction of the slide rail under the action of an external force. The sliding table 21 is fixedly connected with the distance measuring probe 17 at the top, and the two maintain an axial parallel relationship, so as to ensure that the distance measuring probe 17 is always in a predetermined direction during the extension process, avoiding measurement errors caused by deflection.

[0027] In the scheme, the distance measuring probe 17 itself is a cylindrical probe structure, the front end is designed as a sharp end, which is convenient for accurately reaching the measured point, and the rear end is connected with the probe threaded knob 16 to form a transmission link. The sliding table knob 23 is arranged at the top of the sliding table 21 below the distance measuring probe 17, and an active connection relationship is formed between the end of the sliding table knob 23 and the wide straight slide rail 20. For example, when the sliding table knob 23 is rotated, the internal threaded pair can be driven to move close to or away from the surface of the wide straight slide rail 20, thereby realizing the position locking or unlocking of the sliding table 21 on the slide rail.

[0028] The probe threaded knob 16, the probe distance measuring differential cylinder 18 and the probe distance measuring section 19 are sequentially and spacedly arranged along the length direction of the distance measuring probe 17 to form a set of precise displacement driving and reading system. The probe threaded knob 16 is connected to the tail of the distance measuring probe 17 through threaded cooperation. When the knob is manually rotated, the distance measuring probe 17 can be driven to move forward or backward as a whole to realize millimeter-level feeding control. Each rotation corresponds to 1mm of forward or backward movement of the probe. The circumference of the probe distance measuring differential cylinder 18 is equally divided into 50 sections. Combined with the design of 1mm screw pitch, each section corresponds to a displacement of 0.02mm, thereby realizing a measurement resolution of 0.02mm.

[0029] The probe distance measuring section 19 is the actual working part of the front end of the distance measuring probe 17, and its length is sufficient to penetrate the fine hole 24 on the transparent conical sleeve 3 and contact the surface of the spray needle head 1. The surface of the probe distance measuring section 19 is provided with clear reference lines or zero position marks, which is convenient for reading the difference between the initial state and the final extension amount.

[0030] When the needle thread knob 16 is operated, the distance measuring needle 17 can be extended towards the fine hole 24 according to the measurement requirements until it passes through the fine hole 24 and contacts the point to be measured. Similarly, the needle thread knob 16 can be rotated in the opposite direction to gradually retract the distance measuring needle 17 and disengage the contact with the measured point, so that the distance measuring needle 17 can be adjusted in the non-contact state, and after confirming the correct position, the formal measurement is performed, effectively avoiding data deviation or equipment damage caused by accidental contact.

[0031] The bottom of the inclined platform 14 is connected with an inclined support, which is a load-bearing component of the angle adjusting mechanism, used to transmit the action force of the control rod 11 and drive the entire inclined platform 14 to change the angle. The inclined support is made of metal plate and has sufficient structural strength to support the weight of the upper assembly.

[0032] The base plate is detachably arranged on the top of the telescopic platform 8 and serves as the installation basis of the screw rod and the sliding block 12. The base plate is provided with a screw rod arranged in the horizontal direction, and the axis of the screw rod is parallel to the longitudinal center line of the telescopic platform 8. The sliding block 12 is threadedly connected to the outside of the screw rod, and the sliding block 12 can produce linear displacement along the axial direction of the screw rod when the screw rod rotates. The bottom of the sliding block 12 is fixedly connected with the inclined support. Therefore, when the sliding block 12 moves, it directly pushes or pulls the inclined support to make it tilt around the axial direction of the telescopic platform 8 as the tilt center.

[0033] In this embodiment, the support rod 13 is rotationally connected to the base plate, and one end of the support rod 13 is hingedly connected with the inclined support, constituting part of the three-point support structure. When the tilt angle is adjusted in place, the support rod 13 can be fixed by locking to prevent angle drift caused by vibration or self-weight during measurement.

[0034] The support rod 13 can be provided with an adjusting bolt or a quick release pin structure for easy locking and releasing. The control rod 11 is connected with the sliding block 12 and used to manually drive the sliding block 12 to displace along the longitudinal direction of the screw rod. The control rod 11 can be in the form of a handle fixed to one side of the sliding block 12. The operator can realize the forward and backward movement of the sliding block 12 by pushing and pulling the control rod 11, so as to accurately adjust the tilt angle of the inclined support, so that the inclined platform 14 can adapt to the curvature change of different regions of the spray needle head 1, and ensure that the distance measuring needle 17 can realize vertical contact consistent with the normal direction of the surface at any measurement point.

[0035] In the specific application, the control lever 11 drives the sliding block 12 to move along the screw, so as to change the spatial posture of the inclined support, and the inclined support drives the inclined platform 14 and the wide straight slide rail 20, the sliding table 21 and the distance measuring probe 17 installed thereon to incline as a whole. On this basis, the sliding table 21 moves transversely on the wide straight slide rail 20, so as to realize the position adjustment of the distance measuring probe 17 in the circumferential direction. The sliding table knob 23 is used to lock the position of the sliding table 21. Finally, the probe screw knob 16 controls the extension and retraction of the distance measuring probe 17, and the accurate displacement value is obtained by combining the reading of the probe distance measuring differential cylinder 18, so that the whole system realizes the integration of the spatial three-dimensional adjustment (radial, axial and angle) and the high-precision distance measuring function.

[0036] Meanwhile, due to the wide straight slide rail 20 with scale lines and the lockable sliding table 21, the transverse positioning of the distance measuring probe 17 is more intuitive and stable. By adjusting the inclination angle through the control lever 11, the sliding block 12 and the screw linkage mechanism, the distance measuring probe 17 can always be perpendicular to the point to be measured, so as to solve the problem that the traditional measurement method is difficult to ensure the normal contact. The combination design of the probe screw knob 16 and the probe distance measuring differential cylinder 18 significantly improves the measurement resolution, which can reach 0.02 mm at the minimum, and meets the accurate capture demand of the subtle abrasion amount.

[0037] For example, when measuring the conical surface area of the spray needle head 1, the direction of the distance measuring probe 17 can be made to coincide with the local normal line by adjusting the angle of the inclined platform 14, and then the extension amount of the distance measuring probe 17 is read by using the probe distance measuring differential cylinder 18. After deducting the wall thickness of the transparent conical sleeve 3, the real abrasion depth is obtained, so as to obtain reliable and repeatable measurement results. The system can be applied to the overhaul site of the impulse water turbine, and can also be expanded to other industrial scenes which need to evaluate the fixed-point and quantitative abrasion of the surface of special-shaped parts.

[0038] Further, the inclined platform 14 has a vertical end and a horizontal end, and the wide straight slide rail 20 is connected to the vertical end through the height control bolt 22 and is axially parallel to the horizontal end. By adjusting the height control bolt 22, the height of the wide straight slide rail 20 fixed to the vertical end can be adjusted, and the horizontal end serves as the base support surface of the whole inclined platform 14 and is connected to the top of the telescopic platform 8, so as to ensure the stability of the torque transmission and the structural rigidity.

[0039] The L-shaped structure can be made of high-strength metal materials (such as aluminum alloy or stainless steel) to ensure that it does not deform and loosen during frequent adjustment, and at the same time, the lightweight demand is considered. The wide straight slide rail 20 is detachably connected to the vertical end of the inclined platform 14 through the height control bolt 22, and the installation direction is axially parallel to the horizontal end, so that the extension direction of the wide straight slide rail 20 always maintains geometric consistency with the reference surface of the inclined platform 14, thereby ensuring the straightness and stability of the sliding table 21 when moving along the wide straight slide rail 20.

[0040] The height control bolt 22 penetrates the connecting portion of the wide straight slide rail 20 and is screwed into the corresponding threaded hole on the vertical end, allowing the wide straight slide rail 20 to slide up and down on the vertical end to adjust the position in the untightened state; when adjusted to the required height, the height control bolt 22 is tightened to achieve firm locking, preventing displacement during measurement. By operating the height control bolt 22, the installation height of the wide straight slide rail 20 on the vertical end can be adjusted steplessly.

[0041] In the scheme, the control rod 11 is connected to the end of the sliding block 12 away from the measured spray needle; wherein when the control rod 11 is operated, the sliding block 12 can drive the inclined support to tilt towards the measured spray needle with the axial direction of the telescopic platform 8 as the tilt center. By arranging the control rod 11 on the side of the sliding block 12 away from the measured spray needle, the operator has more operating space and clearer visual judgment conditions when adjusting the tilt angle.

[0042] After the control rod 11 is connected to the sliding block 12, its movement direction is along the screw axis, pushing or pulling the sliding block 12 to move linearly along the screw. The movement of the sliding block 12 further drives the connected inclined support to swing. Since the rotation support point of the inclined support is designed with the axial direction of the telescopic platform 8 as the center, the entire tilting process is a pitching movement with the central axis of the telescopic platform 8 as the rotation axis, ensuring that the distance measuring probe system 15 always remains in the radial plane passing through the axis of the measured spray needle during the tilting adjustment process.

[0043] The sliding block 12, as a transmission component, can slide freely in the axial direction on the screw. Its material can be selected from wear-resistant engineering plastics or aluminum alloy to reduce the overall weight and friction resistance. The screw adopts a precision ball screw structure to ensure the stability and repeat positioning accuracy of the movement of the sliding block 12. The control rod 11 itself can be a rigid rod, with one end fixed to the outer end of the sliding block 12 and the other end extending to the outside of the device for easy manual or tool-driven operation.

[0044] When the operator pushes the control rod 11, the sliding block 12 moves towards the spray needle, pulling the front end of the inclined support down to achieve forward tilting of the tilting platform 14. Conversely, pulling the control rod 11 makes the inclined support rebound to the initial position or tilt in the opposite direction. The rotation support structure of the inclined support can adopt a pin shaft hinged form, with the pin shaft penetrating the support and forming a rotatable connection with the support seat on the body of the telescopic platform 8. The axis of the pin shaft coincides with the axial direction of the telescopic platform 8, thereby strictly limiting the rotation center of the tilting movement.

[0045] Due to the control lever 11 acting on the slider 12 far end, and cooperating with the telescopic platform 8 axis as the center of the hinge structure, the tilt movement has good symmetry and stability; in actual measurement, when it is needed to make the ranging probe 17 perpendicular to a point on the curved surface of the spray needle head 1, the tilt angle can be adjusted by pushing and pulling the control lever 11, and the posture of the probe in the transparent conical sleeve 3 is observed, until the probe passes through the fine hole 24 and is completely perpendicular to the inner wall of the transparent conical sleeve 3; at this time, the locking support rod 13 is locked, and the current optimal tilt state is fixed, providing a consistent reference direction for subsequent multi-point measurement.

[0046] In the scheme, the telescopic platform 8 includes a telescopic platform body; two groups of telescopic rods 9 are symmetrically arranged on the telescopic platform body; and a telescopic joint is connected between the two groups of telescopic rods 9. By setting the telescopic platform body as a bearing base, the two groups of telescopic rods 9 are symmetrically arranged on both sides of the telescopic platform body to form a stable support frame, and the telescopic joint is connected between the two groups of telescopic rods 9 to constitute a linkage lifting mechanism, so that the telescopic platform 8 as a whole moves stably in the vertical direction.

[0047] The telescopic platform body is used for mounting the tilt platform 14 and the ranging probe system 15 above, and needs to have sufficient structural strength to bear the static and dynamic loads generated in the measurement process; the material thereof can be selected from high-strength aluminum alloy or stainless steel, which not only ensures rigidity but also takes into account lightweight design, and is suitable for on-site portable detection scenes; the two groups of telescopic rods 9 are symmetrically arranged on the left and right sides of the telescopic platform body respectively, each group of telescopic rods 9 can adopt a multistage sleeve type structure composed of an outer tube and an inner rod in sliding cooperation, and a guide key or a ball guide is arranged inside to prevent radial deviation, so as to ensure the straightness and stability in the lifting process; the material of the telescopic rod 9 can be selected from alloy steel with surface hardening treatment, which has good wear resistance and fatigue resistance and can be reliably operated for a long time under frequent telescopic action.

[0048] The telescopic joint is connected between the two groups of telescopic rods 9 and located below or in the middle of the telescopic platform body, and plays a role in synchronous transmission and structural connection; it can adopt a flexible metal connecting rod, a hinge mechanism or a synchronous belt structure to realize the linkage of the action of the two groups of telescopic rods 9, so as to ensure that the left and right sides are consistent in displacement during lifting, and prevent the out-of-sync phenomenon from affecting the measurement accuracy.

[0049] For example, the platform lifting knob 10 is fixedly connected to the telescopic platform body; when the platform lifting knob 10 is rotated, the two groups of telescopic rods 9 can drive the telescopic platform 8 to move up and down; when the platform lifting knob 10 is operated to drive the screw to rotate, the power is transmitted to the driving mechanism of the telescopic rod 9, and the telescopic joint maintains the coordination of the movement of the two sides, so that the telescopic platform body moves stably in the vertical direction, improving the structural stability and movement consistency of the telescopic platform body in the adjustment process.

[0050] In some variant embodiments, the telescopic rod 9 can be replaced by a hydraulic cylinder, a pneumatic cylinder or an electric push rod, etc. to realize automatic lifting control; a single set of centrally arranged telescopic mechanism can also be used to maintain stability with the aid of multi-point support guide rails. The transmission relationship between the platform lifting knob 10 and the telescopic rod 9 depends on the mechanical linkage mechanism.

[0051] In the scheme, the rotating platform 6 includes a rotating platform body, the bottom of which is provided with two groups of struts; the inner and outer slide rails 5 include a first slide rail and a second slide rail, both of which are annular structures, the second slide rail is located outside the first slide rail and axially coincides with the first slide rail; one group of struts is in sliding connection with the first slide rail, and the other group of struts is in sliding connection with the second slide rail. By setting the structure of double-ring slide rails cooperating with double groups of struts, the rotating platform 6 can realize smooth and controllable circumferential sliding on the top of the fixed platform, effectively avoiding the shaking, deviation or jamming phenomenon caused by single-point support or single-rail guidance, thereby ensuring the alignment consistency of the distance measuring needle system 15 at different measurement angles.

[0052] Among them, the rotating platform body serves as the load-bearing main body of the entire rotating assembly, used for mounting the telescopic platform 8 and the inclined platform 14 and other components above, and its overall structure is a rigid metal frame, which has sufficient strength and anti-deformation ability to withstand the weight of the upper structure and maintain geometric stability during operation.

[0053] The rotating platform body is provided at the bottom with two groups of struts, each of which can include one or more vertically downward extending struts for forming sliding connection with the slide rails below. The two groups of struts are arranged on the radial sides of the rotating platform body respectively, forming a symmetrical layout, which is conducive to torque balance and motion stability.

[0054] The inner and outer slide rails 5 are composed of a first slide rail and a second slide rail, both of which are in closed annular structure, the central axis of which coincides with the axis of the needle to be measured, ensuring that the rotating path is symmetrically distributed around the center of the needle, the first slide rail is located on the inner side, and the second slide rail is arranged on the outer periphery thereof, maintaining a certain distance therebetween to form a coaxial nesting relationship.

[0055] The slide rails can be made of stainless steel and subjected to precision grinding treatment to reduce frictional resistance and improve wear resistance. The cross sections of the slide rails can be designed as T-shaped, V-shaped or dovetail groove-shaped, and the bottom ends of the struts are provided with matching roller structures to realize low-resistance and stable sliding cooperation. One group of struts is in sliding connection with the first slide rail, and the other group of struts is in sliding connection with the second slide rail, thereby forming a motion constraint system of inner and outer double rails and four-point support, which significantly enhances the positioning stiffness of the rotating platform 6 in the horizontal plane, limits the degrees of freedom of the rotating platform 6 in the radial, axial and torsional directions, and prevents problems such as up-and-down jumping, lateral deviation or tilting instability during rotation. At the same time, the design of the annular slide rail supports 360° continuous rotation, so that the rotating platform 6 can be flexibly moved to below any circumferential position of the spray needle to meet the demand of full-circumferential multi-point measurement.

[0056] Further, first bolt holes are formed in the two groups of struts, and second bolt holes are formed in the first slide rail and the second slide rail. The first bolt holes and the second bolt holes are connected by lateral fixing bolts 7 to position the rotating platform body. The two groups of struts are arranged at the bottom of the rotating platform body to realize sliding cooperation with the inner and outer slide rails 5. First bolt holes are formed in each group of struts, and corresponding second bolt holes are formed in the first slide rail and the second slide rail. When the rotating platform 6 is moved to the desired measurement angle along the circular slide rail, the lateral fixing bolts 7 are sequentially inserted into the first bolt holes and the corresponding second bolt holes to complete mechanical connection, thereby limiting the circumferential movement freedom of the rotating platform 6 relative to the slide rail and realizing spatial positioning. The arrangement positions of the first bolt holes on the two groups of struts need to be spatially matched with the second bolt holes on the slide rail to ensure that alignment assembly can be achieved at multiple preset angles. The bolt holes can be designed as through holes for use with standard bolts and nut assemblies, or as blind holes for use with single-head bolts, depending on the convenience of installation and the strength requirements of the structure.

[0057] The number of first bolt holes and second bolt holes is not limited to one, and multiple holes can be arranged at intervals on each group of struts and the corresponding slide rail segments to form discrete angle adjustment positions, for example, a set of aligned holes is arranged every 15° or 30° to meet the spatial distribution requirements of different measurement points.

[0058] When the rotating platform 6 is slid to below a certain azimuth of the spray needle to be measured, the position of the strut corresponds to a group of second bolt holes on the slide rail. At this time, by inserting the lateral fixing bolts 7 into the first bolt holes and the second bolt holes and tightening them, the rotating platform body and the inner and outer slide rails 5 are integrally connected to eliminate the relative sliding tendency and significantly improve the static stability of the measurement system.

[0059] In the scheme, the to-be-measured spray needle includes a spray needle head 1 and a straight-flow spray pipe 2, the spray needle head 1 is arranged at the top of the straight-flow spray pipe 2, the straight-flow spray pipe 2 is vertically arranged at the top of a fixed platform and is connected with the fixed platform through a fixing bolt 4, the shape of the spray needle under the real working condition is restored and stable clamping is realized, so that the accuracy and repeatability of subsequent abrasion measurement are guaranteed.

[0060] The to-be-measured spray needle refers to a key component that is detached from a water turbine and needs to be evaluated in terms of surface abrasion, and the to-be-measured spray needle has an overall slender shaft structure and mainly includes two functional regions: the spray needle head 1 located at the upper part and the straight-flow spray pipe 2 serving as a support main body, the spray needle head 1 is a part that directly participates in jet flow regulation and is long-term in contact with high-speed water flow and is prone to local abrasion, and usually has a conical or streamlined shape, the straight-flow spray pipe 2 has a cylindrical channel structure and is used for guiding high-pressure water flow and supporting the spray needle head 1, and the surface of the straight-flow spray pipe 2 may also be slightly abraded due to sand particle impact. The fixing bolt 4 is connected with the fixed platform, that is, a flange or a base structure is arranged at the bottom of the straight-flow spray pipe 2, and at least one fixing bolt 4 is used to fasten the straight-flow spray pipe 2 in a preset mounting hole in the fixed platform. The fixing bolt 4 connection mode has the advantages of convenient assembly and disassembly, reliable clamping, high repeatability and the like, and is suitable for rapid replacement and multi-batch measurement requirements in a field maintenance environment.

[0061] In a second aspect, the application provides a method for measuring the surface abrasion amount of a spray needle, and the method is performed by using the spray needle abrasion amount measuring device of any one of the above-mentioned embodiments. S1: After the spray needle (including the spray needle head 1 and the straight-flow spray pipe 2) is detached from the water turbine, the spray needle is vertically placed at the center of the fixed platform and is fixed by using six fixing nuts 4; S2: The position of the measurement point of the spray needle head 1 is determined, the rotating platform 6 is rotated to be below the measurement point after the position is determined, and after the position of the rotating platform 6 is confirmed, the bottom of the rotating platform 6 support is connected and fixed with the circular inner and outer slide rails 5 through the lateral fixing bolts 7, so that the position of the rotating platform 6 is locked; S3: According to the height of the measurement position of the measurement point on the to-be-measured spray needle, the rotating platform lifting knob 10 controls the lifting of the telescopic platform 8 to adjust the height of the telescopic platform 8 until the distance measuring probe 17 and the measurement position of the measurement point are located at about the same height; S4: The transparent conical sleeve 3 is placed on the spray needle head 1, so that the distance measuring probe 17 and the fine hole 24 are located at the same cross-sectional position, and the abrasion amount of the surface of the spray needle head 1 is measured; S5: The tilt angle of the tilting platform 14 is adjusted by controlling the operating rod 11, and it is determined that the distance measuring probe 17 is approximately perpendicular to the spray needle head 1 by visual judgment, and after the tilt angle is determined, the tilt angle of the tilting platform 14 is kept unchanged by actuating the support rod 13; S6: Keep the distance measuring probe 17 in the un-extended state, at this time the distance measuring probe distance measuring section 19 is extended by zero; Next, loosen the slide table knob 23, control the slide table 21 to move on the wide straight slide rail 20, ensure that the distance measuring probe 17 is moved to the vertical hole 24 on the surface of the transparent conical sleeve 3; Wherein, if the distance measuring probe 17 cannot be completely moved into the hole 24 and vertically attached to the inner surface of the transparent conical sleeve 3, the angle of the inclined platform 14 can be adjusted by repeating step S5, and the vertical distance between the wide straight slide rail 20 and the surface of the inclined platform 14 can be adjusted by means of the height control bolt 22, and the lateral observation is carried out through the transparent conical sleeve 3 until the needle head of the distance measuring probe 17 can be completely vertically attached to the surface of the spray needle head 1, at this time the inclined angle of the inclined platform is fixed by rotating the support rod 13, and the slide table knob 23 is tightened, and the position of the slide table 21 on the wide straight slide rail 20 at this time is recorded; S7: Loosen the slide table knob 23, move the slide table 21, remove the distance measuring probe 17 from the hole 24, and remove the transparent conical sleeve 3 from above the spray needle head 1, then move the slide table 21 to the recorded position in step S6, and tighten the slide table knob 23; S8: Repeat steps S2-S3 to adjust the position of the distance measuring probe 17, and adjust the height of the wide straight slide rail 20 on the inclined platform 14, until the needle head of the distance measuring probe 17 can completely coincide with the measurement point after being stretched out; At this time, rotate the needle threaded knob 16 until the needle head of the distance measuring probe 17 completely coincides with the measurement point on the surface of the spray needle head 1, then read the extended distance value of the distance measuring probe distance measuring section 19 and the number of rotations of the distance measuring probe distance measuring differential cylinder 18, obtain the reading of the distance measuring probe 17 at this time, and then subtract the thickness of the inner surface of the transparent conical sleeve 3, which is 1mm, to obtain the wear amount value of the measurement point; S9: When measuring the measurement points of other parts of the spray needle head 1, repeat steps S2-S3 and adjust the vertical distance between the wide straight slide rail 20 and the surface of the inclined platform 14, keep the inclined angle of the inclined platform 14 unchanged, and the distance measuring probe 17 can be vertically attached to any position of the spray needle head 1 by moving the slide table 21, so as to realize the wear amount measurement of any position of the spray needle head 1; S10: When measuring the surface erosion amount of the straight flow nozzle 2, repeat steps S1-S3 (wherein, step S2 is changed to rotate the rotating platform 6 to the position below the non-worn part of the straight flow nozzle 2, and fix it by means of the lateral fixing bolt 7), at this time the inclined angle of the inclined platform 14 is zero, the distance measuring probe 17 is kept in the un-extended state, the slide table knob 23 is loosened, the slide table 21 is controlled to move on the wide straight slide rail 20 until the distance measuring probe 17 is in vertical contact with the surface of the straight flow nozzle 2, the slide table knob 23 is tightened, and the position of the slide table 21 on the wide straight slide rail at this time is recorded; S11: loosen the sliding table knob 23, move the sliding table 21 back a small distance, repeat steps S2-S3, move the sliding table 21 to the position of the sliding table 21 on the wide straight rail 20 determined in step S10, tighten the sliding table knob 23, rotate the measuring needle threaded knob 16 until the distance measuring needle 17 is completely perpendicular to the surface of the straight flow nozzle 2, read the distance value of the distance measuring section 19 of the measuring needle and the number of rotations of the measuring needle distance differential cylinder 18, obtain the reading of the measuring needle at this time, and obtain the wear value of the measurement point of the straight flow nozzle 2; S12: repeat step S11 to measure the abrasion value of different measurement points of the straight flow nozzle 2.

[0062] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the amount of erosion of a jet needle of a Pelton turbine, characterized in that, The utility model relates to a kind of platform for measuring the abrasion of spray needle, including: Fixed platform, for placing the spray needle to be measured on, the spray needle to be measured has a plurality of points to be measured on it; Inner and outer slide rail, set on the top of the fixed platform, and located on the outside of the spray needle to be measured, axial coincidence with the spray needle to be measured; Rotary platform, slidingly connected on the inner and outer slide rail, can rotate around the spray needle to be measured; Telescopic platform, set on the top of the rotary platform, one end of the telescopic platform away from the rotary platform is connected with inclined platform; Distance measuring probe system, detachably connected on the inclined platform, its measuring end is towards the spray needle to be measured; Transparent conical sleeve, a plurality of fine holes are opened on the outside of the transparent conical sleeve, which are perpendicular to the axis of the transparent conical sleeve, Wherein, when measuring the abrasion of the spray needle to be measured, the transparent conical sleeve is sleeved on the outside of the spray needle to be measured, the height between the measuring end and the plurality of points to be measured is adjusted by the telescopic platform, and the measuring end is contacted with the points to be measured through the fine holes by the inclined platform.

2. A device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 1, characterized in that The distance measuring probe system includes: Wide straight slide rail, detachably set on the inclined platform, one end of the wide straight slide rail away from the inclined platform has first scale line; Sliding table, slidingly connected on the wide straight slide rail, can displace along the length direction of the wide straight slide rail, the top of the sliding table is connected with distance measuring probe, the distance measuring probe is axial parallel with the sliding table; Fixed knob, set on the top of the sliding table, and located below the distance measuring probe, the end of the fixed knob is movably connected with the wide straight slide rail; Wherein, when rotating the fixed knob, the position of the sliding table on the wide straight slide rail can be locked or unlocked; Probe screw knob, probe distance measuring differential cylinder and probe distance measuring section are sequentially and spacedly set along the length direction of the distance measuring probe; Wherein, when rotating the probe screw knob, the distance measuring probe can be driven to extend towards the fine hole and contact with the points to be measured through the fine hole; Or, when rotating the probe screw knob, the distance measuring probe can be driven to retract from the fine hole and separate from the points to be measured; The bottom of the inclined platform is connected with inclined support; Base plate, detachably set on the top of the telescopic platform, the base plate is provided with screw rod, the outside of the screw rod is connected with sliding block, the sliding block is connected with the bottom of the inclined support; Supporting rod, rotatably connected on the base plate, one end of the supporting rod is connected with the inclined support; Control rod, connected with the sliding block, can drive the sliding block to displace along the length direction of the screw rod, so as to adjust the inclination angle of the inclined support.

3. A device for measuring the wear of a jet needle of a Pelton turbine according to claim 2, characterized in that The inclined platform is L-shaped structure, having vertical end and horizontal end; The wide straight slide rail is connected on the vertical end through height control bolt, and is axial parallel with the horizontal end; Wherein, when operating the height control bolt, the height of the wide straight slide rail fixed on the vertical end can be adjusted.

4. The device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 2, wherein The control rod is connected with one end of the sliding block away from the spray needle to be measured; Wherein, when operating the control rod, the sliding can drive the inclined support to incline towards the spray needle to be measured with the telescopic platform as the inclination center.

5. The device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 2, wherein The telescopic platform includes: Telescopic platform body; Two groups of telescopic rods, symmetrically set on the telescopic platform body; Telescopic joint, connected between the two groups of telescopic rods.

6. A device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 5, characterized in that It also includes platform lifting knob, the platform lifting knob is fixedly connected on the telescopic platform body; Wherein, the rotating platform lifting knob, two groups of telescopic rod can drive telescopic platform displacement.

7. The device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 1, wherein The rotating platform comprises: The rotating platform body is provided with two groups of support columns at the bottom; The inner and outer slide rails comprise a first slide rail and a second slide rail, both of which are annular structures, the second slide rail is located outside the first slide rail and axially coincides with the first slide rail; One group of the support columns is in sliding connection with the first slide rail, and the other group of the support columns is in sliding connection with the second slide rail.

8. A device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 7, characterized in that First bolt holes are formed in the two groups of support columns, and second bolt holes are formed in the first slide rail and the second slide rail; Wherein, the first bolt hole and the second bolt hole are connected by a lateral fixing bolt to position the rotating platform body.

9. The device for measuring the abrasion of a jet needle of a Pelton turbine according to claim 1, wherein The needle to be measured comprises a needle head and a straight-flow nozzle, the needle head is arranged at the top of the straight-flow nozzle, the straight-flow nozzle is vertically arranged on the top of the fixed platform and connected with the fixed platform through a fixing bolt.

10. A method of measuring the amount of surface abrasion of a spray needle, characterized by, The method is performed by using the impact water turbine needle abrasion measurement device of any one of claims 1-9, comprising: S1: fixing the needle to be measured at the center of the fixed platform; S2: rotating the rotating platform to a position below the measurement position and locking the position; S3: adjusting the height of the telescopic platform according to the height of the measurement position of the needle to be measured and judging by visual observation that the distance measuring needle and the measurement position are at the same height; S4: measuring the abrasion amount of the surface of the needle head, and sleeving the transparent conical sleeve on the surface of the needle head; S5: adjusting the angle of the inclined platform by operating the control rod, judging by visual observation that the distance measuring needle is perpendicular to the surface of the needle head, and fixing the support rod to the inclined support after determining the inclination angle; S6: keeping the distance measuring needle in the unrotated state, at this time the extension distance is zero, controlling the sliding table to move on the wide straight slide rail, and moving the distance measuring needle into the fine hole; if the distance measuring needle cannot be completely moved into the hole and vertically attached to the inner surface of the transparent conical sleeve, the inclination angle of the inclined platform can be adjusted again, and the vertical distance between the wide straight slide rail and the inclined platform surface can be adjusted at the same time until the needle head of the distance measuring needle can be completely vertically attached to the surface of the needle head, at this time the inclination angle of the inclined platform is determined, and the position of the sliding table on the wide straight slide rail at this time is recorded; S7: moving the sliding table to move the distance measuring needle out of the fine hole, and removing the transparent conical sleeve from above the needle head; S8: moving the sliding table to the position determined by the slide rail scale line in step S6, repeating steps S2-S3, and adjusting the height of the wide straight slide rail on the inclined platform to fine-tune the position of the distance measuring needle until the distance measuring needle can completely coincide with the measurement point after being extended straight; At this time, the rotating needle screw knob is rotated until the distance measuring needle completely coincides with the measurement point on the surface of the needle head, the extension distance value of the distance measuring needle and the rotation number of the differential cylinder are read, the needle reading at this time is obtained, and the thickness of the inner surface of the conical sleeve is subtracted to obtain the wear amount value of the measurement point. S9: When measuring other to-be-measured points of the spray needle head, the inclination angle of the inclined platform is kept unchanged, at this time, the distance measuring probe is moved by the sliding table and can be vertically attached to the spray needle head, steps S2-S3 are repeated, and the vertical distance between the wide straight slide rail and the surface of the inclined platform is adjusted, so that the abrasion amount measurement of different to-be-measured points of the spray needle head can be realized; S10: When measuring the abrasion amount of the surface of the DC spray pipe, since the abrasion of the DC spray pipe is small, steps S1-S3 are repeated; wherein, in step S2, the rotating platform is rotated to the position below the un-abraded part and is fixed by the lateral fixing bolt, at this time, the inclination angle of the inclined platform is zero, the distance measuring probe is kept in the un-rotated state, the sliding table is controlled to move on the wide straight slide rail until the distance measuring probe is vertically contacted with the surface of the DC spray pipe, and the position of the sliding table on the wide straight slide rail at this time is recorded; S11: Steps S2-S3 are repeated, the sliding table is moved to the position of the sliding table on the wide straight slide rail determined in step S10, the threaded knob of the distance measuring probe is rotated until the distance measuring probe is completely coincided with the surface of the DC spray pipe, the extension distance value of the distance measuring probe and the rotation number of the differential cylinder are read, the reading of the distance measuring probe at this time is obtained, and the abrasion amount value of the measurement point of the DC spray pipe is obtained; S12: Step S11 is repeated, and the abrasion amount measurement of different measurement points of the DC spray pipe can be realized.

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