CN215447651U - Special inspection tool for guide cylinder - Google Patents

Abstract

The utility model discloses a special checking tool for a guide cylinder, which comprises a fixed support, wherein 24 pin gauge pins are detachably arranged on the fixed support, the positions of the pin gauge pins correspond to the positions of guide holes on an internal component of the guide cylinder, each pin gauge pin comprises a cylindrical detection section and a verification section coaxially arranged at the end part of the detection section, the outer diameter of the detection section is matched with the aperture of the guide hole, and the outer diameter of the verification section is smaller than that of the detection section, so that a shoulder is formed between the verification section and the detection section. The utility model can accurately detect whether the aperture, the position and the like of the guide hole meet the design requirements, thereby ensuring the precision of the guide cylinder and being beneficial to improving the detection efficiency of the guide cylinder.

Description

Special inspection tool for guide cylinder

Technical Field

The utility model relates to the technical field of detection tools, in particular to a special inspection tool for a guide cylinder.

Background

The control rod guide cylinder is a key component of the reactor, and has the main function of providing reliable positioning and guiding for the up-and-down movement of the control rod assembly and ensuring that the control rod can be quickly and accurately inserted into the fuel assembly to realize emergency shutdown under the accident condition.

The prior art guiding cylinder structure is shown in fig. 1, and comprises an inner assembly (not shown in the figure) and flanges 1 arranged at two ends of the inner assembly, wherein the inner assembly is provided with 8 groups of double holes and 8 groups of single holes, the double holes comprise two guiding holes 2 arranged along the radial direction, the single hole comprises one guiding hole, and the single hole and the double holes are sequentially distributed at intervals in the circumferential direction. The guide holes are numerous, and the position precision of the guide holes is required to be less than 0.025 mm. Therefore, not only the processing difficulty is high, but also the detection after the processing is very difficult.

In the prior art, the parameters such as the bore diameter of each guide hole on the inner component and the distance between adjacent guide holes are detected by a measuring tool such as a caliper to determine whether the guide cylinder is qualified. However, the above detection method has the following technical defects: first, since the inner member needs to be welded to the flanges at both ends, the inner member is easily deformed during welding, thereby causing a positional deviation of the guide hole. That is, even if the inspected inner member is qualified after being welded into the guide sleeve, the guide hole position accuracy may not meet the design requirement. Secondly, the aperture of measuring the guiding hole with measuring tool such as slide caliper rule has "contingency", makes the shape of guiding hole have slight deformation easily after the internal component welding, that is to say, even the aperture of a direction is qualified, can not get rid of the guiding hole and warp to the elliptical aperture yet if carry out the measurement of a plurality of directions apertures to the guiding hole, again greatly reduced detection efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a special checking tool for a guide cylinder, which can accurately detect whether the aperture, the position and the like of a guide hole meet the design requirements, so that the precision of the guide cylinder is ensured, and the detection efficiency of the guide cylinder is improved.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a special inspection tool of guide cylinder, includes the fixed bolster, detachably is equipped with 24 bullet gauge pins on the fixed bolster, and each guiding hole position on the position of each bullet gauge pin and the guide cylinder internal component corresponds, bullet gauge pin includes columniform detection section, the coaxial calibration section that sets up at detection section tip, the external diameter and the guiding hole aperture phase-match of detection section, the external diameter of calibration section is less than and detects the section external diameter to form the shoulder between calibration section and detection section.

When the hole diameter and the position precision of each guide hole on the guide cylinder need to be detected to meet the design requirements, each pin gauge pin on the fixed support can be inserted into the corresponding guide hole, if the pin gauge pin can be smoothly inserted into the guide hole, the hole diameter and the position precision of the guide hole meet the design requirements, otherwise, the hole diameter or the position of the guide hole is deviated, and the guide cylinder is an unqualified product.

Different from the prior art, the utility model utilizes the cylindrical detection section to detect the aperture of the guide hole, and the function of the utility model is equal to that of the existing plug gauge, thereby being capable of accurately measuring the aperture of the whole guide hole. In particular, when the inner member is welded to the flanges at both ends, once the guide hole is slightly oval due to deformation, the diameter of the guide hole at a portion position is constant even if the circumference of the guide hole is constant, but the diameter of the guide hole at a portion position is necessarily smaller than the design size, so that the entry of the detection section into the guide hole is difficult; or, the detection section cannot enter the guide hole due to the position deviation of a certain guide hole.

In addition, when the inner assembly and the flange are welded, the detection can be carried out step by step, namely, when part of welding is completed, the tool can be used for measuring each guide hole, and when the aperture, the position precision and the like of the guide holes meet the design requirements, the subsequent welding assembly is continued, so that 'useless work' can be effectively avoided when the guide cylinder is welded and assembled. In addition, because the pin gauge and the fixed support are detachably connected, pin gauge pins with different specifications and sizes can be prepared so as to measure guide cylinders with different models and specifications; or the guide holes in different processing stages of rough machining, finish machining, integral assembly and the like are measured, and the guide holes of the guide cylinder in each process stage can meet the design requirements, so that unnecessary waste is reduced, and the use efficiency of the measuring tool is improved.

Preferably, the circumferential surface of the detection section is a spherical surface, and the calibration section is a cylindrical surface connected with the circumferential surface of the detection section.

Because the outer circumference of the detection section is a spherical surface, when the detection section is inserted into the guide hole of the guide cylinder, the detection section and the guide hole can form line contact, so that the contact area is greatly reduced, the detection section can be conveniently inserted into the guide hole, the detection section can be favorably contacted with the guide hole, and the detection precision is improved.

It can be understood that the pin gauge is assembled on the fixed support, assembly errors can be generated in the assembly process, and the detection section with the spherical outer circumferential surface is inconvenient to measure, so that the utility model utilizes the cylindrical calibration section to detect whether the position of the assembled pin gauge on the fixed support meets the design requirements. The pin gauge pin can be manufactured by turning, so that the cylindrical calibration section can be used as a short-time clamping section for turning detection, the clamping and turning are convenient, and the calibration section and the detection section can be kept coaxial. In addition, we can also verify the position of the detection segment by measuring the position of the verification segment.

In particular, the checking section is made into a cylindrical surface connected with the circumferential surface of the detection section, so that the connecting line of the coaxially arranged checking section and the detection section is a horizontal circle. When the position of the detection section needs to be verified, a verification sleeve can be sleeved on the verification section firstly, and then the distance between the verification sleeve and the connecting line is observed. If the detection section and the calibration section are in accordance with the coaxial design, the calibration sleeve should be attached to the connecting line. Conversely, if there is an irregular gap between the calibration sleeve and the connecting line, i.e., the connecting line is not a horizontal circle, it indicates that the test section is not coaxial with the test section. Therefore, the maximum gap between the check sleeve and the connecting line can be obtained by calculation.

Preferably, the fixed support comprises a middle circular body and 16 cantilever sections which are integrally and radially extended from the edge of the circular body and distributed at intervals, connecting through holes are formed in the cantilever sections, an integral connecting section is arranged at one end, away from the calibration section, of the spring gauge pin, external threads are arranged at the end part of the connecting section, and the connecting section penetrates through the connecting through holes and then is in threaded connection with the fastening nut.

Because circular body and cantilever section are made integratively, consequently, be favorable to increasing the rigidity of cantilever section, can alleviate the weight of fixed bolster then, make things convenient for the measurement to the guiding hole.

Particularly, the connecting section of the pin gauge pin is conveniently matched with the connecting through hole in the cantilever section, so that the pin gauge pin has high positioning precision. And the pin gauge is fixed on the cantilever section through the fastening nut, so that the pin gauge is convenient to disassemble and assemble, and the pin gauge is convenient to finely adjust, so that the position precision of the pin gauge meets the design requirement.

Preferably, the connecting section comprises a fixing section integrally connected with the detection section, and the circumferential surface of the fixing section is a conical surface with the taper of 0.15-0.18.

When the connecting section is inserted into the connecting through hole of the cantilever section, the circumferential surface of the fixing section is a conical surface with the taper of 0.15-0.18, so that the fixing section and the connecting through hole are convenient to form good fit and a tiny fit clearance, and the positioning accuracy of the pin gauge is improved.

When the taper of the circumferential surface of the fixed section is less than 0.15, the connecting section is easy to form self-locking in the connecting through hole, so that the connecting section is inconvenient to disassemble and replace. When the circumferential taper of the fixing section is greater than 0.18, the connecting section is easily installed in the connecting through hole.

Preferably, an adjusting gasket sleeved on the connecting section is arranged between the detection section and the cantilever section.

It can be understood that, when the connecting section is inserted into the connecting through hole of the cantilever section, since the circumferential surface of the fixing section is a conical surface, if the outer diameter of the fixing section exceeds the maximum positive tolerance, the fixing section may not be completely installed in place, whereas if the outer diameter of the fixing section is less than the maximum negative tolerance, the positioning accuracy of the fixing section may be affected. The adjusting gaskets sleeved on the connecting sections are creatively arranged between the detection sections and the cantilever sections, so that the fixing sections can be designed to have positive tolerance as much as possible, and then the minimum fit clearance is formed between the fixing sections and the connecting through holes on the premise of ensuring that the fixing sections are completely installed in place by properly increasing and decreasing the number of the adjusting gaskets or changing the thickness of the adjusting gaskets, thereby being beneficial to improving the position precision of the spring gauge pin.

Preferably, a positioning ring coaxial with the circular body is arranged on one side, close to the fastening nut, of the fixing support, 16 positioning notches are arranged on the positioning ring at intervals, and the cantilever section is clamped in the positioning notches.

Because the cantilever section may form certain deformation relative to the circular body, the position accuracy of the pin gauge of the spring is affected, and therefore 16 positioning notches with high positioning accuracy can be machined in the positioning circular ring through numerical control machining and the like. When the fixed support is assembled and the position accuracy of the pin gauge pin is measured, the 16 cantilever sections of the fixed support can be clamped in the positioning notches corresponding to the positioning circular rings in sequence, and if the cantilever sections cannot be clamped in the corresponding positioning notches, the cantilever sections can be bent or have machining errors; on the contrary, if the cantilever section can be smoothly clamped into the corresponding positioning notch, the cantilever section meets the design requirement, and at the moment, the positioning ring can play a role in reinforcing each cantilever section, so that the rigidity of the cantilever section is improved.

Therefore, the utility model has the following beneficial effects: both can accurately detect whether aperture, position etc. of guiding hole accord with the design requirement, ensure the precision of guide cylinder then, be favorable to promoting the detection efficiency of guide cylinder simultaneously.

Drawings

Fig. 1 is a schematic view of a guide cylinder.

Fig. 2 is a first structural diagram of the present invention.

Fig. 3 is a side sectional view of fig. 1.

Fig. 4 is a partial structural view of the utility model at a pin gauge pin in a second configuration.

Fig. 5 is a second structural schematic of the present invention.

In the figure: 1. the device comprises a flange 2, a guide hole 3, a fixing support 31, a circular body 32, a cantilever section 321, a connecting through hole 4, a pin gauge pin 41, a detection section 42, a verification section 43, a connecting section 431, a fixing section 5, a fastening nut 6, an adjusting gasket 7, a positioning ring 71 and a positioning notch.

Detailed Description

The utility model is further described with reference to the following detailed description and accompanying drawings.

As shown in fig. 2 and 3, the inspection tool special for the guide cylinder is suitable for measuring the hole diameter, particularly the position precision, of 24 guide holes on the inner assembly of the guide cylinder shown in fig. 1. The device specifically comprises a fixed support 3, wherein 24 pin gauges 4 are detachably arranged on the fixed support, and the positions of the pin gauges correspond to the positions of guide holes in an internal component of the guide cylinder. The bullet gauge pin includes detection section 41, and the lower extreme of detection section is connected on the fixed bolster, and the external diameter and the guiding hole aperture phase-match of detection section.

When the pore diameter and the position precision of each guide hole on the internal assembly of the guide cylinder are required to be detected to meet the design requirements, each pin gauge on the fixed support can be inserted into the corresponding guide hole, if the detection section of the pin gauge can be smoothly inserted into the guide hole, the pore diameter and the position precision of the guide hole meet the design requirements, and the function of the detection section is equal to that of the existing plug gauge; otherwise, the diameter or position of the guide hole is deviated, and the guide cylinder is a defective product. Because the pin gauge is detachably arranged on the fixed support, the pin gauge can be changed by different pin gauges to adapt to the measurement of guide cylinders with guide holes with different hole diameters.

It should be noted that, the aperture of the guiding hole can be detected by a measuring tool of the plug gauge after the completion of the processing, that is, it is not practical novel mainly to measure whether the position of each guiding hole meets the design requirement, and at the same time, it is measured "along with" whether the guiding hole is smaller than the designed minimum aperture.

In addition, when the inner assembly and the flange are welded, the guide holes can be detected step by step, namely, when part of welding is completed, the tool can be used for measuring each guide hole, and when the aperture, the position precision and the like of the guide holes meet the design requirements, subsequent welding assembly is continued, so that 'useless work' can be effectively avoided when the guide cylinder is welded and assembled.

It will be appreciated that in order to improve the accuracy of the measurement, the inspection tool of the utility model itself requires extremely high dimensional and positional accuracy, and in particular, the pin gauges. Because the pin gauge is detachably arranged on the fixed support, certain assembly errors can be generated when the pin gauge is assembled. Therefore, after the pin gauge pin is assembled, the position precision of the pin gauge pin needs to be detected, and the precision of an inspection tool can meet the measurement requirement of the guide sleeve.

Preferably, an integrated calibration segment 42 is coaxially disposed at the upper end of the detection segment, on one hand, the coaxially disposed calibration segment can be used for turning the clamping end of the detection segment, and on the other hand, the position accuracy of the calibration segment is measured, that is, the position accuracy of the detection segment is equal to the position accuracy of the detection segment.

Furthermore, the outer circumferential surface of the detection section can be set to be a spherical surface, and the detection section is in a convex drum shape at the moment, so that when the detection section is inserted into the guide hole of the guide cylinder, the detection section and the guide hole can form line contact, the contact area is greatly reduced, the detection section can be conveniently inserted into the guide hole, the detection section can be favorably contacted with the guide hole, and the detection precision is improved.

In addition, the checking section can be arranged as a cylindrical surface connected with the circumferential surface of the detection section, and at the moment, the connecting line of the coaxially arranged checking section and the detection section is a horizontal circle. Because the detection section with the spherical outer circumference surface is inconvenient to measure, when the position of the detection section needs to be checked, a checking sleeve matched with the checking section can be sleeved on the checking section firstly, and then the distance between the checking sleeve and the connecting line is observed. If the detection section and the calibration section are in accordance with the coaxial design, the calibration sleeve should be attached to the connecting line. Conversely, if there is an irregular gap between the calibration sleeve and the connecting line, i.e., the connecting line is not a horizontal circle, it indicates that the test section is not coaxial with the test section. Therefore, the maximum gap between the check sleeve and the connecting line can be obtained by calculation.

On the basis of ensuring that the checking section is coaxial with the detection section, 24 checking holes can be formed in one measuring sample plate through high-precision machining processes such as wire cutting, numerical control machining and the like, and then the checking holes of the measuring sample plate are sleeved on the corresponding checking section. If the checking section can smoothly enter the checking hole, the position accuracy of each pin gauge meets the design requirement, otherwise, the position accuracy of the pin gauge and the design requirement have larger deviation.

As a preferable scheme, the fixing bracket comprises a middle circular body 31 and 16 cantilever sections 32 which are integrally and radially extended from the edge of the circular body and are distributed at intervals, the cantilever sections are provided with connecting through holes 321, the lower end of the spring gauge pin, which is far away from the calibration section, is provided with an integral connecting section 43, the end part of the connecting section is provided with external threads, and the connecting section downwards penetrates through the connecting through holes and then is in threaded connection with a fastening nut 5, so that the spring gauge pin is in threaded connection with the cantilever sections. Of course, the position of each connecting through hole on the cantilever section should correspond to the position of each guide hole on the inner assembly. Because the circular body and the cantilever section are integrally manufactured, the rigidity of the cantilever section is favorably increased, the weight of the fixed support can be reduced, and the measurement of the guide hole is convenient.

Further, as shown in fig. 3 and 4, the connection section includes a fixing section 431 integrally connected with the detection section, and an outer diameter of the fixing section is adapted to an aperture of the connection through hole. When the connecting section is inserted into the connecting through hole of the cantilever section for assembly, the fixing section and the connecting through hole form good matching so as to ensure the accurate positioning of the connecting section and the pin gauge. Certainly, the circumferential surface of the fixing section can also be a conical surface with the taper of 0.15-0.18, so that the fixing section can be conveniently inserted into the connecting through hole to form a tiny fit clearance, and the positioning precision of the pin gauge is improved.

It should be noted that the diameter of the large end of the fixed section and the connecting through hole can form a transition fit of H6/k7, and at this time, a plurality of adjusting gaskets 6 sleeved on the connecting section can be arranged between the detecting section and the cantilever section.

Therefore, when the connecting section is inserted into the connecting through hole of the cantilever section, if the maximum outer diameter of the fixing section is at the maximum tolerance value or even exceeds the maximum tolerance value, the fixing section can not be completely installed in place in the axial direction of the connecting through hole, the number of the adjusting gaskets can be increased or decreased properly or the thickness of the adjusting gaskets can be changed, and the minimum fit clearance is formed between the fixing section and the connecting through hole on the premise that the fixing section is ensured to be completely installed in place, namely the detection section can be completely attached to the adjusting gaskets, so that the position accuracy of the spring gauge pin is improved.

It will be appreciated that the cantilevered section may be deformed or machined out of tolerance relative to the circular body, thereby affecting the positional accuracy of the pin gauge. Of course, one could increase the cross-sectional size of the cantilever section to increase its rigidity, but correspondingly increase the weight of the inspection tool.

Therefore, as shown in fig. 5, a positioning ring 7 coaxial with the circular body may be further disposed on the fixing bracket on a side close to the fastening nut, 16 positioning notches 71 are disposed on the positioning ring at intervals, and each cantilever section of the fixing bracket is locked in the corresponding positioning notch. Thus, when the fixed support is assembled and the position accuracy of the pin gauge pin is measured, the 16 cantilever sections of the fixed support can be clamped in the positioning notches corresponding to the positioning rings in sequence, and if the cantilever sections cannot be clamped in the corresponding positioning notches, the cantilever sections can be bent and deformed or have machining errors; on the contrary, if the cantilever section can be smoothly clamped into the corresponding positioning notch, the cantilever section meets the design requirement. In addition, the positioning ring can also play a role in reinforcing each cantilever section, so that the rigidity of the cantilever section is improved.

Claims (6)

1. The utility model provides a special inspection tool of guide cylinder, includes the fixed bolster, characterized by, detachably is equipped with 24 bullet gauge pins on the fixed bolster, and the position of each bullet gauge pin corresponds with each guiding hole position on the guide cylinder inner assembly, bullet gauge pin includes columniform detection section, the coaxial check-up section that sets up at detection section tip, the external diameter and the guiding hole aperture phase-match of detection section, the external diameter of check-up section is less than the detection section external diameter to form the shoulder between check-up section and detection section.

2. The inspection tool special for the guide cylinder as claimed in claim 1, wherein the circumferential surface of the detection section is a spherical surface, and the calibration section is a cylindrical surface connected with the circumferential surface of the detection section.

3. The inspection tool special for the guide cylinder as claimed in claim 2, wherein the fixing bracket comprises a middle circular body and 16 cantilever sections which are integrally and radially extended from the edge of the circular body and are distributed at intervals, the cantilever sections are provided with connecting through holes, one end of the spring gauge pin, which is far away from the calibration section, is provided with an integral connecting section, the end part of the connecting section is provided with external threads, and the connecting section is in threaded connection with the fastening nut after passing through the connecting through holes.

4. The inspection tool special for the guide cylinder as claimed in claim 3, wherein the connecting section comprises a fixing section integrally connected with the detection section, and the circumferential surface of the fixing section is a conical surface with the taper of 0.15-0.18.

5. The inspection tool of claim 3, wherein an adjusting washer is disposed between the detecting section and the cantilever section and is disposed on the connecting section.

6. The inspection tool special for the guide cylinder as claimed in claim 3, wherein the fixing bracket is provided with a positioning ring coaxial with the circular body on a side close to the fastening nut, the positioning ring is provided with 16 positioning notches at intervals, and the cantilever section is clamped in the positioning notches.

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