Improved bullet shell wall thickness difference detection tool

Abstract

The utility model discloses an improved bullet shell wall thickness difference detection tool which comprises an outer arc claw and an inner arc claw, two claw arms corresponding to the outer arc claw and the inner arc claw are hinged together in a scissor-shaped structure, a spring is connected between the two claw arms of the inner arc claw, the end part of one claw arm of the inner arc claw is provided with a graduated scale, and the end part of the other claw arm of the inner arc claw is provided with a clamping groove. And an adjusting needle is arranged at the end part of the other claw arm of the inner arc-shaped claw. The tool is manufactured in a split mode, combined and assembled into a whole, flexible adjustment can be carried out according to the target size, the problems that a bullet shell wall thickness difference detection tool is low in universality, high in use cost, tedious in calibration and maintenance, long in time and the like are solved, maintenance and calibration are easy and convenient, and the universality is high.

Description

Technical Field

[0001] The utility model relates to a detection tool, in particular to an improved version of a projectile and arrow shell wall thickness difference detection tool, which is a tool suitable for measuring the wall thickness difference of a large-scale deep blind hole projectile and arrow shell. Background Art

[0002] During the stamping production process of missile shells, the wall thickness difference of each product needs to be detected (the wall thickness difference is the size of the maximum wall thickness and the minimum wall thickness of the same circumference caused by the different axes of the inner and outer surfaces of the rotating body workpiece) in order to timely control the shell size and improve the stamping quality in time. Due to the special requirements of the missile shell structure, most of the shells have a large aspect ratio, deep inner bore, and blind hole. At the same time, due to the characteristics of the shell hot stamping production, high production efficiency and fast pace, the wall thickness difference detection tooling requires simple, convenient, accurate measurement, high efficiency, and low cost. In terms of maintenance and calibration, it requires simple, convenient and effective maintenance and debugging.

[0003] In the prior art, ordinary wall thickness difference measuring instruments can only measure the mouth, and cannot enter the inner bore of the shell for operation and measurement. Therefore, the wall thickness difference of other positions such as the inner wall needs to be manufactured according to the target size. Special wall thickness difference detection tooling is mainly used for wall thickness difference calipers. When measuring, the caliper is manually inserted into the measured shell to quickly locate and align. The wall thickness difference is determined by the range of the pointer crossing the reference line when the caliper rotates one circle in the shell. The wall thickness difference detection work can be quickly completed within three seconds.

[0004] However, this technology still has certain defects in practical applications: the universality of detection tooling is low, and special detection tooling needs to be designed for products with different lengths and inner diameter structures, resulting in high tooling manufacturing costs; due to the fast pace of hot stamping production, large batches, harsh environment and other factors, there are many problems such as deformation of measuring tooling, falling off of parts, and deviation of pointers from the target line. The calibration cycle is short and the maintenance frequency is high. Each calibration will cause the pointer to deviate from the reference scale due to problems such as loose components and deformation, resulting in frequent repairs. The repairs require continuous grinding of the reference line and re-marking of the line. Sometimes, the re-marked line deviates from the pointer, resulting in repeated repairs due to unqualified inspections. There are also problems such as cumbersome and time-consuming calibration and maintenance operations, which seriously affect the test results and production progress of the shell. Summary of the invention

[0005] The purpose of the utility model is to solve the problems of low versatility, high cost of use, complicated calibration and maintenance, and long time required for projectile and arrow shell wall thickness difference detection tools, and to provide an improved version of the projectile and arrow shell wall thickness difference detection tooling, which is improved on the basis of the original detection tooling, by adding an adjustable positioning rod and an adjustment pointer, and without changing the original working structure, the working size of the detection tooling can be adjusted according to the length, diameter and wall thickness of the measured workpiece, thereby improving the versatility of the tooling detection and the ease of calibration and maintenance.

[0006] The technical solution adopted by the utility model is: an improved version of a tool for detecting the wall thickness difference of a projectile or arrow shell, comprising an outer arc-shaped claw and an inner arc-shaped claw, wherein two claw arms corresponding to the outer arc-shaped claw and the inner arc-shaped claw are hinged together in a scissor-shaped structure, a spring is connected between the two claw arms of the inner arc-shaped claw, a scale is provided at the end of one claw arm of the inner arc-shaped claw, and an adjustment needle is provided at the end of the other claw arm of the inner arc-shaped claw.

[0007] One end of the adjusting needle points to the scale, and the other end is arranged on the arc plate. The position of the adjusting needle on the arc plate can be adjusted, and the arc plate is arranged at the end of the claw arm corresponding to the inner arc claw.

[0008] A fixing rod is arranged at the hinged position of the two claw arms corresponding to the outer arc-shaped claw and the inner arc-shaped claw, and an adjusting rod is arranged at the other end of the fixing rod. One end of the adjusting rod extends into the cavity at the end of the fixing rod and the extending degree can be adjusted.

[0009] A positioning plate is arranged on the fixing rod.

[0010] The utility model adopts an improved version of the missile shell wall thickness difference detection tool designed by the above technical solution. According to the requirements of the workpiece wall thickness difference measurement, the tool is directly grasped and inserted into the workpiece, so that the tool is quickly rotated around the shell for one circle, and the wall thickness difference is determined by the range of the pointer passing between the scale lines. The utility model uses split manufacturing and combined assembly as one, and can be flexibly adjusted according to the target size, solving the problems of low versatility of the missile shell wall thickness difference inspection tool, high cost of use, and cumbersome calibration and maintenance. It makes maintenance and calibration simple and convenient, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the assembly of an embodiment of the utility model;

[0012] Figure 2 This is a cross-sectional view of the adjustment rod and the fixing rod of the utility model;

[0013] Figure 3 This is a diagram of an application embodiment of the utility model after the tooling pointer is adjusted when changing the measurement target size.

[0014] In the figure: 1-adjusting rod, 2-screw and nut, 3-fixing rod, 4-positioning plate, 5-rivet, 6-outer arc-shaped claw, 7-pin shaft, 8-inner arc-shaped claw, 9-rivet, 10-spring, 11-arc plate, 12-adjusting needle, 13-scale, 14-scale line, 15-screw, nut, 16-workpiece. DETAILED DESCRIPTION

[0015] The following is a detailed description of an improved version of the projectile and arrow shell wall thickness difference detection tooling of the utility model in conjunction with the accompanying drawings.

[0016] The utility model is an improved version of the projectile shell wall thickness difference detection tool, see Figures 1 to 3 , including an outer arc claw 6 and an inner arc claw 8, wherein the two claw arms corresponding to the outer arc claw 6 and the inner arc claw 8 are respectively an integral structure, and are hinged together by a pin 7 to form a scissor-shaped structure. A spring 10 is connected between the two claw arms of the inner arc claw 8, and the spring 10 is riveted to the claw arm by a rivet 9. The spring 10 can ensure that the change of the wall thickness difference of the shell parts between the outer arc claw 6 and the inner arc claw 8 is synchronously reflected in the change of the adjustment needle 12 during measurement. A scale 13 is set at the end of one claw arm of the inner arc claw 8, and a scale line 14 is engraved on the scale 13. An adjustment needle 12 is set at the end of the other claw arm of the inner arc claw 8. One end of the adjustment needle 12 of the utility model points to the scale 13, and the other end is set on the arc plate 11, and the arc plate 11 is provided with an arc groove. The adjustment needle 12 is fixed on the arc plate 11 by a screw nut 15, and the position of the adjustment needle 12 can be adjusted. The arc plate 11 is set at the corresponding claw arm end of the inner arc claw 8. The adjusting needle 12 can be adjusted according to the requirements of different wall thicknesses of different workpieces, so that the calibration and alignment between the pointer and the reference line can be completed without reworking and re-marking the scale 13.

[0017] The utility model is provided with a fixing rod 3 at the hinge pin shaft 7 of the two claw arms corresponding to the outer arc claw 6 and the inner arc claw 8, and an adjusting rod 1 is provided at the other end of the fixing rod 3, one end of the adjusting rod 1 is inserted into the cavity at the end of the fixing rod 3, and a plurality of screw holes are arranged at equal intervals on the adjusting rod 1 and the fixing rod 3, and the adjusting rod 1 and the fixing rod 3 are fixed together by screws and nuts 2, and the degree of the adjusting rod 1 extending into the fixing rod 3 is adjusted by changing the fixing position of the screws and nuts 2, so that the adjusting rod 1 can be adjusted in height according to the measurement requirements of the wall thickness difference of the measured workpiece at different heights. The utility model is provided with a positioning plate 4 on the fixing rod 3, and the positioning plate 4 is riveted to the fixing rod 3 by rivets 5, and the positioning plate 3 can ensure that the tooling has a good positioning when it probes into the workpiece, thereby ensuring the accuracy of the measurement.

[0018] The utility model assembles various components into one body and is suitable for detecting the wall thickness difference of missile shell parts. When working, the rods of the inner arc claw 8 and the outer arc claw 6 are grasped and inserted into the target workpiece 16. The arc claws tightly clamp the inner and outer walls of the workpiece 16 under the action of the spring 10. The manual grasping tool quickly rotates around the workpiece 16. During the rotation, the range of the adjustment needle 12 between the scale lines 14 is visually adjusted to determine the wall thickness difference of the workpiece.

[0019] When the target workpiece is replaced, due to the change in the height and diameter of the measured workpiece, the matching height of the adjusting rod 1 and the fixing rod 3 can be adjusted by the screw and nut 2. The adjusting rod 1 can be freely extended and retracted in the fixing rod 3 to the required height, and the height adjustment is completed after being fixed by the screw and nut 2. Due to the change in the diameter and wall thickness of the workpiece, by adjusting the position of the adjusting needle 12 connected to the positioning plate 4 and the arc plate 11, even if the wall thickness of the measured workpiece changes, the adjusting needle 12 is still aligned with the reference line of the scale line 14, avoiding the work of processing and testing tooling and repeatedly engraving the scale line 14. When the tooling needs to be calibrated and verified regularly, the verification personnel will adjust the direction of the adjusting needle 12 in time according to the calibration results, simplifying the calibration and maintenance process.

Claims

1. An improved version of the projectile shell wall thickness difference detection tool, including an outer arc claw and an inner arc claw, characterized in that The two claw arms corresponding to the outer arc claw and the inner arc claw are hinged together in a scissor-shaped structure, a spring is connected between the two claw arms of the inner arc claw, a scale is set at the end of one claw arm of the inner arc claw, and an adjustment needle is set at the end of the other claw arm of the inner arc claw.

2. The improved version of the projectile and arrow shell wall thickness difference detection tool according to claim 1 is characterized by: One end of the adjusting needle points to the scale, and the other end is arranged on the arc plate. The position of the adjusting needle on the arc plate can be adjusted, and the arc plate is arranged at the end of the claw arm corresponding to the inner arc claw.

3. The improved version of the projectile and arrow shell wall thickness difference detection tool according to claim 1 is characterized in that A fixing rod is arranged at the hinged position of the two claw arms of the outer arc-shaped claw and the inner arc-shaped claw, and an adjusting rod is arranged at the other end of the fixing rod. One end of the adjusting rod extends into the cavity at the end of the fixing rod and the extending degree can be adjusted.

4. The improved version of the projectile and arrow shell wall thickness difference detection tool according to claim 3 is characterized by: A positioning plate is arranged on the fixing rod.

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