Flange bolt hole detection tool

Abstract

The utility model relates to the technical field of flange detection, and particularly discloses a flange bolt hole detection tool, which comprises a circular supporting disc, the upper end of the supporting disc is connected with a handle, a plurality of detection arms are uniformly arranged along the edge of the supporting disc, and each detection arm comprises a detachable supporting sleeve connected with the supporting disc. A telescopic rod is connected in the supporting sleeve, the end part of the telescopic rod is connected with a detachable detection rod, and the diameter of a flange bolt hole is detected through the detection rod; according to the utility model, all bolt holes on a flange can be detected at one time, and the detection efficiency is high; the device is simple to use, can be operated by common workers, has no skill requirements, and is reliable in detection result and low in personnel cost; the whole device is low in manufacturing cost, so that the flange bolt hole detection cost is reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of flange inspection technology, specifically a flange bolt hole inspection fixture. Background Technology

[0002] A flange, often simply called a flange, is typically a disc-shaped metal body with several holes around its perimeter for fastening other components. It is widely used in machinery. The machining quality of the flange bolt holes is crucial, directly affecting the sealing performance, load-bearing capacity, and safety of the flange connection; misalignment of the holes leads to uneven bolt preload, causing media leakage.

[0003] Currently, the common method for inspecting the diameter of flange bolt holes is to use an inside micrometer to measure the hole diameter (to check whether the diameter of the bolt hole meets the required size, as there is often a problem where the diameter of the machined bolt hole is smaller than the standard bolt hole diameter). While the inside micrometer has high accuracy, its measurement efficiency is low. Each bolt hole needs to be inspected one by one, and each flange typically has 6 or 8 bolt holes. Measuring them one by one is slow, and delays in inspection can lead to production line shutdowns and losses. Furthermore, prolonged measurement can cause eye fatigue, affecting both the quality and efficiency of the inspection. Utility Model Content

[0004] This utility model addresses the aforementioned shortcomings of existing technologies by providing a flange bolt hole inspection fixture that can inspect all bolt holes on a flange at once, resulting in high inspection efficiency. The device is simple to use, can be operated by ordinary workers without skill requirements, provides reliable inspection results, and has low personnel costs. Furthermore, the overall manufacturing cost of the device is low, thereby reducing the cost of flange bolt hole inspection and improving inspection efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A flange bolt hole inspection fixture includes a circular support plate with a handle connected to the upper end of the support plate. Multiple inspection arms are evenly arranged along the edge of the support plate. Each inspection arm includes a detachable support sleeve connected to the support plate. A telescopic rod is connected inside the support sleeve, and a detachable inspection rod is connected to the end of the telescopic rod. The diameter of the flange bolt hole is inspected by the inspection rod.

[0007] Preferably, the handle is provided with a retaining ring.

[0008] Preferably, the upper and lower sidewalls of the support plate are respectively provided with positioning holes and positioning grooves, one end of the support sleeve is provided with a clamping groove that cooperates with the support plate, and the sidewall of the clamping groove is respectively provided with an insertion hole corresponding to the position of the positioning hole and a guide block that cooperates with the positioning groove. The insertion hole and the positioning hole are connected by a fixing pin.

[0009] Preferably, the upper end of the fixing pin is provided with an end cap, and the bottom of the end cap is provided with a magnet that attracts the support sleeve.

[0010] Preferably, the telescopic rod has scale lines on its side wall, and the support sleeve has positioning bolts for fixing the telescopic rod on its side wall.

[0011] Preferably, the end of the telescopic rod is provided with a connecting sleeve, and the upper end of the detection rod is provided with a stud that mates with the connecting sleeve.

[0012] Preferably, a limiting ring is provided on the side wall of the detection rod, and the length of the detection rod below the limiting ring is not less than the thickness of the flange.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model can inspect all bolt holes on a flange at once, with high inspection efficiency; the device is simple to use, can be operated by ordinary workers, requires no skills, the inspection results are reliable, and the personnel cost is low; the overall manufacturing cost of the device is low, thereby reducing the inspection cost of flange bolt holes and improving inspection efficiency.

[0015] 2. Both the detection rod and the detection arm of this utility model are detachable, making maintenance convenient and cost-effective.

[0016] 3. The detection rod of this utility model is replaceable and its position is adjustable, enabling it to detect flange bolt holes of different models, and it has high versatility. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 Schematic diagram of the support plate Figure 1 ;

[0019] Figure 3 Schematic diagram of the support plate Figure 2 ;

[0020] Figure 4 Schematic diagram of the detection arm Figure 1 ;

[0021] Figure 5 Schematic diagram of the detection arm Figure 2 ;

[0022] Figure 6 Schematic diagram of the detection rod;

[0023] Figure 7 This is a structural diagram of the fixing pin;

[0024] Figure 8 This is a schematic diagram of the structure of this utility model in use;

[0025] In the diagram: 1-Support plate; 101-Positioning hole; 102-Retaining ring; 103-Handle; 104-Positioning groove; 2-Detection arm; 201-Support sleeve; 202-Insertion hole; 203-Clamping groove; 204-Guide block; 205-Positioning bolt; 206-Scale line; 207-Telescopic rod; 208-Connecting sleeve; 3-Detection rod; 301-Limiting ring; 302-Stud; 4-Fixing pin; 401-Magnet; 402-End cap; 5-Flange. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1 As shown, a flange bolt hole inspection fixture, which simultaneously inspects the diameter of all bolt holes, includes a circular support plate 1, as shown. Figure 2 As shown, a handle 103 is connected to the upper end of the support plate 1, and multiple detection arms 2 are evenly arranged along the edge of the support plate 1, the number of which can be 6, 8, 12, 16, etc.; Figure 4 , Figure 5 As shown, the detection arm 2 includes a detachable support sleeve 201 connected to the support plate 1. A telescopic rod 207 is connected inside the support sleeve 201. A detachable detection rod 3 is connected to the end of the telescopic rod 207. The diameter of the bolt hole of the flange 5 is detected by the detection rod 3.

[0028] The handle 103 is equipped with a retaining ring 102, which can limit the gripping position of the hand.

[0029] like Figure 2 , Figure 3 As shown, the upper and lower side walls of the support plate 1 are respectively provided with positioning holes 101 and positioning grooves 104. One end of the support sleeve 201 is provided with a clamping groove 203 that cooperates with the support plate 1. The side wall of the clamping groove 203 is respectively provided with an insertion hole 202 corresponding to the position of the positioning hole 101 and a guide block 204 that cooperates with the positioning groove 104. The insertion hole 202 and the positioning hole 101 are connected by a fixing pin 4. The fixing pin 4 is detachable, which allows the support arm to be disassembled and replaced.

[0030] like Figure 7 As shown, the upper end of the fixing pin 4 is provided with an end cap 402, and the bottom of the end cap 402 is provided with a magnet 401 that is attracted to the support sleeve 201. The pin is fixed by the magnet 401, and the assembly and disassembly are simple and quick.

[0031] The telescopic rod 207 has a scale line 206 on its side wall, and the support sleeve 201 has a positioning bolt 205 on its side wall to fix the telescopic rod 207. The position of the detection rod 3 can be adjusted according to the flange 5 of different diameters, increasing the versatility of use.

[0032] like Figure 5 As shown, the end of the telescopic rod 207 is provided with a connecting sleeve 208, such as... Figure 6 As shown, the upper end of the detection rod 3 is provided with a stud 302 that mates with the connecting sleeve 208. The detection rod 3 is detachable and replaceable, and different diameter and length detection rods 3 are used according to different diameter bolt holes.

[0033] A limiting ring 301 is provided on the side wall of the detection rod 3. The length of the detection rod 3 below the limiting ring 301 is not less than the thickness of the flange 5, ensuring that the detection rod 3 can completely penetrate the entire flange 5.

[0034] like Figure 8 As shown, in use, first select the corresponding test rod 3 according to the diameter of the bolt hole. After connecting the test rod 3 to the connecting sleeve 208, adjust the length of the telescopic rod 207 according to the position of the bolt hole of the standard flange 5 so that each test rod 3 can fit perfectly with the bolt hole of the standard flange 5. After adjustment, use the handle 103 to grip the device and test each flange 5 one by one. During testing, if the test rod 3 can be fully inserted into the bolt hole of the flange 5, it means that the bolt hole diameter meets the standard bolt hole size. If the test rod 3 cannot be inserted into the bolt hole, it means that the bolt hole is too small and the machining is unqualified.

[0035] Of course, the maximum and minimum dimensions of the bolt holes can also be checked, that is, by using two sets of test bars of different diameters, one set as a go gauge and the other set as a stop gauge, for example:

[0036] If the flange bolt hole design diameter is Φ20H9 (tolerance zone +0.052 / 0):

[0037] The diameter of the go gauge bar is 20.000 mm (lower tolerance limit).

[0038] The diameter of the stop gauge bar is 20.052 mm (upper tolerance limit).

[0039] When using a go gauge bar for testing, the mark of pass is: the go gauge bar falls freely to the bottom under its own weight.

[0040] When using a stop gauge bar for inspection, insert the stop gauge bar vertically into the borehole. A pass / fail result is when the stop gauge bar gets stuck in the borehole and cannot be inserted (even when a light pressure of 5N is applied).

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A flange bolt hole inspection fixture, characterized in that: The device includes a circular support plate with a handle connected to its upper end. Multiple detection arms are evenly arranged along the edge of the support plate. Each detection arm includes a detachable support sleeve connected to the support plate. A telescopic rod is connected inside the support sleeve, and a detachable detection rod is connected to the end of the telescopic rod. The diameter of the flange bolt hole is detected by the detection rod.

2. The flange bolt hole inspection fixture as described in claim 1, characterized in that: The handle is equipped with a retaining ring.

3. The flange bolt hole inspection fixture as described in claim 1, characterized in that: The upper and lower side walls of the support plate are respectively provided with positioning holes and positioning grooves. One end of the support sleeve is provided with a clamping groove that cooperates with the support plate. The side wall of the clamping groove is respectively provided with an insertion hole corresponding to the position of the positioning hole and a guide block that cooperates with the positioning groove. The insertion hole and the positioning hole are connected by a fixing pin.

4. The flange bolt hole inspection fixture as described in claim 3, characterized in that: The upper end of the fixing pin is provided with an end cap, and the bottom of the end cap is provided with a magnet that attracts the support sleeve.

5. The flange bolt hole inspection fixture as described in claim 1, characterized in that: The telescopic rod has scale lines on its side wall, and the support sleeve has positioning bolts for fixing the telescopic rod on its side wall.

6. The flange bolt hole inspection fixture as described in claim 1, characterized in that: The telescopic rod is provided with a connecting sleeve at its end, and the upper end of the detection rod is provided with a stud that mates with the connecting sleeve.

7. The flange bolt hole inspection fixture as described in claim 1, characterized in that: The side wall of the detection rod is provided with a limiting ring, and the length of the detection rod below the limiting ring is not less than the thickness of the flange.

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