A tapered thread taper measuring device

Abstract

This application belongs to the field of measuring instruments, specifically relating to a tapered measuring device for an external tapered thread, including a guide rod, a fixed side rod, and a movable measuring rod. The fixed side rod is located at one end of the guide rod and is equipped with a dial indicator. The movable measuring rod includes a sliding seat slidably fitted onto the guide rod, a support column mounted on the sliding seat, and a fixed contact mounted on the support column and opposite to the measuring contact of the dial indicator. At least one positioning washer is embedded inside the sliding seat. By tightening the fastening screw, the positioning washer can be compressed to fit tightly against the guide rod, thus fixing the movable measuring rod relatively stably on the guide rod. By loosening the fastening screw, the movable measuring rod can slide freely on the guide rod. The contact between the positioning washer and the guide rod is greater than the direct contact between the fastening screw and the guide rod. Only a few operations are needed to tighten or loosen, or even just one fastening screw, to complete the position adjustment of the movable measuring rod, making the operation simpler and improving measurement efficiency.

Description

Technical Field

[0001] This application belongs to the field of measuring instruments, and specifically relates to a tapered measuring device for external tapered threads. Background Technology

[0002] Currently, tapered thread connections are a common choice in the field of industrial pipeline connections. The taper of the external tapered thread is a very important parameter affecting the interchangeability of threaded connections. Since the taper tolerance is very small, accurate measurement is necessary and essential.

[0003] Existing taper measuring devices consist of multiple components, including a fixed rod, a movable measuring rod, a fixed measuring rod, a dial indicator, a spring, and a lever. The movable measuring rod moves along the fixed rod to adjust its position. The movable measuring rod is fixed to the fixed rod only by the end of a screw, which is prone to slippage and instability. Multiple screws are needed to reduce slippage, making the process cumbersome and resulting in low measurement efficiency. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a taper measuring device for external tapered threads, which optimizes the fixing mechanism of the movable side rod, makes the operation simpler, and helps to improve the measurement efficiency.

[0005] This application provides a taper measuring device for external tapered threads, comprising:

[0006] Guide rod;

[0007] A fixed side rod is provided at one end of the guide rod, and a dial indicator is provided on the fixed side rod;

[0008] The movable measuring rod includes a sliding seat slidably sleeved on the guide rod, a support column disposed on the sliding seat, and a fixed contact disposed on the support column and opposite to the measuring contact of the dial indicator. At least one positioning washer is embedded in the inner side of the sliding seat, and the sliding seat is fixed by screwing at least one positioning washer to the guide rod by pressing the friction force generated between the positioning washer and the guide rod through the fastening screw.

[0009] Optionally, at least three positioning pads are embedded inside the sliding seat, and are respectively located opposite to both sides of the guide rod and the side near the support column, and the fastening screw is screwed to the side of the sliding seat.

[0010] Optionally, a ball screw is screwed onto the side of the sliding seat away from the support column, and one end of the ball screw rolls into the guide rod for fine adjustment and support of the movable measuring rod.

[0011] Optionally, the outer contour of the sliding seat is a cuboid or cube structure.

[0012] Optionally, the circumferential surface of the guide rod includes four positioning planes and four arc surfaces spaced apart from each other. The four positioning planes respectively cooperate with a plurality of positioning washers and ball screws. The positioning plane that cooperates with the ball screw has an arc groove, which is consistent with the arc of the ball screw. The four arc surfaces are clearance-fitted with the inner hole of the sliding seat.

[0013] Optionally, the positioning pad is rectangular in shape.

[0014] Optionally, the guide rod is screwed, snapped, or plugged with a limiting member to prevent the movable measuring rod from sliding out.

[0015] Optionally, a conversion connector is connected between the support column and the fixed contact, and the fixed contact is screwed or plugged into the conversion connector.

[0016] Optionally, the outer periphery of the fixed side bar and the support column are both covered with a first anti-slip layer and a second anti-slip layer.

[0017] Optionally, the fixed side rod has a through hole, a fastening sleeve is provided in the through hole, the fastening sleeve is fixed by a fixing screw screwed to the fixed side rod, the measuring rod of the dial indicator is screwed to the fastening sleeve, an operating handle is provided on the measuring rod, and the measuring contact is provided at the end of the measuring rod.

[0018] Optionally, a protective plate is provided on one side of the fixed side rod, and the protective plate blocks the back and upper and lower parts of the dial indicator.

[0019] The beneficial effect of this application is that by tightening the fastening screw, the positioning shim can be compressed and tightly fitted to the guide rod. The resulting resistance can stably fix the movable measuring rod on the guide rod. Conversely, loosening the fastening screw allows the movable measuring rod to slide freely on the guide rod. Compared to the direct contact between the fastening screw and the guide rod, the positioning shim has a larger contact area. Only a few screws, or even just one, need to be tightened or loosened to complete the position adjustment of the movable measuring rod, making the operation simpler and improving measurement efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the taper measuring device provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the front view structure of the taper measuring device provided in the embodiments of this application;

[0022] Figure 3 A schematic diagram of the cross-sectional structure of the guide rod provided in an embodiment of this application;

[0023] Figure 4This is a schematic diagram illustrating the usage state of the taper measuring device provided in the embodiments of this application.

[0024] In the diagram: 100, guide rod; 110, positioning plane; 120, arc surface; 130, limiting component; 140, arc groove; 200, fixed side rod; 210, first anti-slip layer; 220, fastening sleeve; 230, fixing screw; 310, sliding seat; 320, support column; 330, fixed contact; 340, fastening screw; 350, positioning washer; 360, ball screw; 370, adapter; 380, second anti-slip layer; 400, dial indicator; 410, measuring rod; 420, measuring contact; 430, operating handle; 500, protective plate. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] like Figure 1-4 As shown, this application provides a tapered measuring device for an external tapered thread, comprising: a guide rod 100, a fixed side rod 200, and a movable measuring rod; wherein, the fixed side rod 200 is disposed at one end of the guide rod 100, and a dial indicator 400 is disposed on the fixed side rod 200; the movable measuring rod includes a sliding seat 310 slidably sleeved on the guide rod 100, a support column 320 disposed on the sliding seat 310, and a fixed contact 330 disposed on the support column 320 and opposite to the measuring contact 420 of the dial indicator 400; at least one positioning washer 350 is embedded in the inner side of the sliding seat 310, and the sliding seat 310 is fixed by the frictional force generated between the positioning washer 350 and the guide rod 100 through the compression of the at least one positioning washer 350 by the fastening screw 340.

[0027] Compared with the prior art, the tapered thread taper measuring device provided in this application allows the positioning shim 350 to be tightly fitted against the guide rod 100 by tightening the fastening screw 340 to compress it. The resulting resistance stably fixes the movable measuring rod to the guide rod 100. Conversely, loosening the fastening screw 340 allows the movable measuring rod to slide freely on the guide rod 100. The positioning shim 350 has a larger contact area with the guide rod 100 compared to the direct contact between the fastening screw 340 and the guide rod 100. Only a few screws (or even just one) need to be tightened or loosened to adjust the position of the movable measuring rod, making operation simpler and improving measurement efficiency.

[0028] It should be noted that the fastening screw 340 can be a hand-tightening screw or a wing screw; the positioning washer 350 can be made of rubber material, and the positioning washer 350 can also be a layered composite structure composed of rubber and metal, which can be a rubber layer-metal layer-rubber layer structure or a rubber layer-metal layer structure. Among them, the rubber includes, but is not limited to, one or more of the following composites: nitrile rubber, silicone rubber, neoprene rubber, EPDM rubber and fluororubber.

[0029] In one possible implementation, at least three positioning washers 350 are embedded inside the sliding seat 310, respectively positioned opposite each other on both sides of the guide rod 100 and on the side near the support column 320, and fastening screws 340 are screwed onto the side of the sliding seat 310. Specifically, by tightening the fastening screws 340, the positioning washers 350 on one side are compressed, causing the positioning washers 350 on the other side to fit tightly against the guide rod 100 along with the sliding seat 310, achieving a double-sided fixation effect and improving the stability of the movable measuring rod.

[0030] It should be noted that when the fastening screw 340 is not tightened, the positioning washer 350 and the guide rod 100 have slight contact and the direct interaction force is negligible, and will not hinder the free sliding of the sliding seat 310; after tightening the fastening screw 340, only a very small displacement is required.

[0031] In one possible implementation, a ball screw 360 is screwed onto the side of the sliding seat 310 away from the support 320. One end of the ball screw 360 rolls into the guide rod 100 for fine-tuning and supporting the movable measuring rod. Specifically, after sliding the sliding seat 310 to its approximate position according to the pipe specifications, very fine adjustments can be made through the rolling engagement of the ball screw 360 and the guide rod 100, which can improve the positional accuracy of the fixed contact 330. Then, the fastening screw 340 is tightened to fix the movable measuring rod. This setup not only supports precise positional adjustments of the movable measuring rod but also provides the necessary support to ensure the stability of the measuring rod during operation.

[0032] In one possible implementation, the outer contour of the slide block 310 is a cuboid or cubic structure. Specifically, the mounting slots of multiple positioning pads 350 correspond to the three circumferential sides of the cuboid or cubic slide block 310, and the ball screws 360 are respectively located on the remaining side. Thus, the cuboid or cubic shape is a regular geometric form with good spatial symmetry and structural rigidity, effectively resisting deformation caused by external loads. This shape helps to keep the overall center of gravity of the slide block 310 centered, reducing the risk of deflection or tilting and improving operational stability.

[0033] In one possible implementation, such as Figure 2 and Figure 3As shown, the circumferential surface of the guide rod 100 includes four locating planes 110 and four arc surfaces 120 spaced apart from each other. The four locating planes 110 respectively mate with multiple locating washers 350 and ball screws 360. The locating plane 110 mates with the ball screw 360 has an arc groove 140, which is consistent with the arc of the ball of the ball screw 360. The four arc surfaces 120 are clearance-fitted with the inner hole of the sliding seat 310. Specifically, the guide rod 100 can be a solid structure or a tubular structure. Understandably, from its cross-sectional structure, the four locating planes 110 are evenly distributed circumferentially, restricting the sliding seat 310 from rotating, and respectively mate with the corresponding locating washers 350. The inner hole of the sliding seat 310 also has four corresponding arc surfaces that are clearance-fitted with the four arc surfaces 120, increasing the contact area between the sliding seat 310 and the guide rod 100, which is beneficial for the movable side rod to slide stably along the guide rod 100.

[0034] In one possible implementation, the positioning pad 350 is rectangular in shape. This provides a more uniform surface, allowing it to fit snugly against the guide rod 100, which helps improve the stability of the movable side rod.

[0035] In one possible implementation, the guide rod 100 is screwed, snapped, or plugged with a limiting member 130 to prevent the movable probe from sliding out. Specifically, the end of the guide rod 100 away from the fixed side rod 200 has a threaded hole, a slot, or a blind hole, and the limiting member 130 can be a screw or a limiting pin, thereby selectively screwing in a screw, snapping in a limiting pin, or plugging in a limiting pin to prevent the movable probe from sliding out.

[0036] In one possible implementation, a transition joint 370 connects the support 320 and the fixed contact 330, with the fixed contact 330 screwed or plugged into the transition joint 370. Specifically, the transition joint 370 is a threaded sleeve or annular sleeve screwed or welded to the support 320. The fixed contact 330 can then have external threads for screwing into the transition joint 370, or it can be plugged into the transition joint 370 via an interference fit. Screwing the fixed contact 330 into the transition joint 370 facilitates the replacement of the fixed contact 330.

[0037] In one possible implementation, both the fixed side bar 200 and the support column 320 are wrapped with a first anti-slip layer 210 and a second anti-slip layer 380. Specifically, the first anti-slip layer 210 and the second anti-slip layer 380 can be made of sponge adhesive, which can increase friction and anti-slip performance, provide a comfortable grip experience, and help improve the stability and safety of use.

[0038] In one possible implementation, the fixed side rod 200 has a through hole, and a fastening sleeve 220 is disposed in the through hole. The fastening sleeve 220 is fixed by a fixing screw 230 screwed to the fixed side rod 200. The measuring rod 410 of the dial indicator 400 is screwed to the fastening sleeve 220. An operating handle 430 is provided on the measuring rod 410, and a measuring contact 420 is disposed at the end of the measuring rod 410. Specifically, the fastening sleeve 220 has an opening and an internal thread. The fixed side rod 200 has a through hole for installing the fastening sleeve 220, providing guidance and installation space for the measuring rod 410. The fastening sleeve 220 is inserted into the through hole, and the measuring rod 410 is locked from the outside by compressing the fastening sleeve 220 with the fixing screw 230, thereby achieving axial and circumferential fixation of the measuring rod 410. The fastening sleeve 220 is designed with an internal thread for threaded engagement with the measuring rod 410.

[0039] In one possible implementation, a protective plate 500 is provided on one side of the fixed side rod 200, which covers the back and top and bottom parts of the dial indicator 400. Specifically, the protective plate 500 is installed on one side of the fixed side rod 200 by screws to prevent the dial indicator 400 from being impacted and bumped from the bottom and four sides.

[0040] like Figure 4 As shown, during use, first loosen the fastening screw 340 and the ball screw 360 so that the sliding seat 310 can slide freely along the guide rod 100. Then adjust the sliding seat 310 so that the measuring contact 420 and the fixed contact 330 are fully engaged with the first thread of the tapered thread of the workpiece being measured. Then tighten the ball screw 360 for positioning. Then tighten the fastening screw 340 to press the positioning washer 350 so that the fixed side rod 200 is firmly fixed to the guide rod 100.

[0041] Next, hold the support 320 with your left hand, making the fixed contact 330 tightly cut into both sides of the first complete thread of the tapered thread. Hold the fixed side rod 200 with your right hand, making the measuring contact 420 tightly cut into both sides of the first complete thread of the tapered thread. Press down with your left hand to ensure that the fixed contact 330 is not moving, and ensure that the measuring contact 420 is in the engaged state. Rotate your right hand in an upward or downward circumferential direction to find the maximum indicated value displayed by the dial indicator 400 and then zero it.

[0042] Next, press the operating handle 430 of the dial indicator 400 with your right thumb, and then move it 8 teeth (1 inch) along the external thread axis. Following the above steps, hold the support 320 with your left hand, so that the fixed contact 330 is tightly engaged with both sides of the thread after moving 8 teeth. Release the operating handle 430 with your right thumb, so that the measuring contact 420 is tightly engaged with both sides of the thread after moving 8 teeth. Then, press down with your left hand to ensure that the fixed contact 330 is not moving, and ensure that the measuring contact 420 is in the engaged state. Rotate your right hand in an upward or downward circumferential direction to find the maximum indication value displayed by the dial indicator 400. The maximum indication value is the external thread taper at the measurement point, that is, the increase in the thread root diameter by moving the external thread 1 inch along the axial direction is 0.0625 inch / inch.

[0043] It should be noted that, according to the GB9253.2-2022 standard, the definition of external thread taper is: the increase in the thread pitch diameter or root diameter per unit thread length along the axial direction; the taper unit is mm / mm or in / in.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0045] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. An apparatus for measuring the taper of external taper thread, characterized by, include: Guide rod (100); A fixed side rod (200) is provided at one end of the guide rod (100), and a dial indicator (400) is provided on the fixed side rod (200). The movable measuring rod includes a sliding seat (310) slidably sleeved on the guide rod (100), a support column (320) disposed on the sliding seat (310), and a fixed contact (330) disposed on the support column (320) and opposite to the measuring contact (420) of the dial indicator (400). At least one positioning washer (350) is embedded in the inner side of the sliding seat (310). The sliding seat (310) is fixed by screwing at least one positioning washer (350) against the friction force generated between the guide rod (100) and the guide rod (100) by fastening screw (340).

2. The taper measuring device of claim 1, wherein, At least three positioning pads (350) are embedded in the inner side of the sliding seat (310), and are respectively located on both sides of the guide rod (100) and on the side near the support column (320). The fastening screw (340) is screwed to the side of the sliding seat (310).

3. The taper measuring device of claim 2, wherein, A ball screw (360) is screwed onto the side of the sliding seat (310) away from the support column (320). One end of the ball screw (360) is in rolling engagement with the guide rod (100) for fine adjustment and support of the movable measuring rod.

4. The taper measuring device of claim 3, wherein, The outer contour of the sliding seat (310) is a cuboid or cube structure.

5. The taper measuring device of claim 4, wherein, The guide rod (100) has four positioning planes (110) and four arc surfaces (120) spaced apart from each other. The four positioning planes (110) respectively cooperate with a plurality of positioning pads (350) and ball screws (360). The positioning plane (110) that cooperates with the ball screws (360) has an arc groove (140). The arc groove (140) is consistent with the arc of the ball screws (360). The four arc surfaces (120) are clearance-fitted with the inner hole of the sliding seat (310).

6. The taper measuring device of claim 4, wherein, The positioning pad (350) is rectangular in shape.

7. The taper measuring device of any one of claims 1-6, wherein, The guide rod (100) is screwed, snapped, or plugged with a limiting member (130) to prevent the movable measuring rod from sliding out.

8. The taper measuring device according to any one of claims 1-6, characterized in that, A conversion connector (370) is connected between the support column (320) and the fixed contact (330), and the fixed contact (330) is screwed or plugged into the conversion connector (370); And / or, the outer periphery of the fixed side bar (200) and the support column (320) is covered with a first anti-slip layer (210) and a second anti-slip layer (380).

9. The taper measuring device of any one of claims 1-6, wherein, The fixed side rod (200) has a through hole, and a fastening sleeve (220) is provided in the through hole. The fastening sleeve (220) is fixed by a fixing screw (230) screwed to the fixed side rod (200). The measuring rod (410) of the dial indicator (400) is screwed to the fastening sleeve (220). An operating handle (430) is provided on the measuring rod (410). The measuring contact (420) is provided at the end of the measuring rod (410).

10. The taper measuring device of claim 9, wherein, A protective plate (500) is provided on one side of the fixed side rod (200), and the protective plate (500) blocks the back and upper and lower parts of the dial indicator (400).

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