Internal taper thread taper measuring device

Abstract

The utility model belongs to the technical field of measuring instruments, and particularly relates to an internal taper thread taper measuring device, which is characterized in that a main rod is hollow, a lever is arranged in the main rod, a measuring meter is arranged on the side surface of one end of the main rod, and the measuring end of the measuring meter penetrates into the main rod and faces one end of the lever; the movable contact is movably arranged on the side face of the other end of the main rod in the radial direction of the main rod, a through hole is formed in the side face of the end of the main rod, the bottom of the movable contact is arranged towards the other end of the lever along the through hole, the elastic piece is used for driving the movable contact to move towards the direction where the lever is located, and the fixed contact is fixed to the side face of the other end of the main rod. The end, corresponding to the measuring meter, of the lever is further provided with a handle, and the handle extends out of the main rod along the side face of the main rod. The internal taper thread taper measuring tool is not easy to scratch or crush parts, and can be better suitable for measuring the internal taper thread taper of parts made of relatively soft materials.

Description

Technical Field

[0001] This utility model belongs to the field of measuring instrument technology, specifically relating to a device for measuring the taper of an internal tapered thread. Background Technology

[0002] Currently, tapered thread connections are a common choice in the field of industrial pipeline connections. The taper of the tapered internal thread is a very important parameter that affects the interchangeability of threaded connections, and it affects the interchangeability and assembly of parts. Therefore, accurate measurement is necessary and essential.

[0003] Some existing internal tapered thread measuring instruments use a beveled fit to convert the radial movement of the measuring head into the axial movement of the measuring end of the measuring instrument. Due to the bevel angle and the friction of the beveled fit, the measuring head of this structure generates a relatively large force during measurement. Furthermore, when the measuring head is inserted into the threaded hole, the thread-pressing moving contact overcomes its elasticity, which can easily scratch parts made of relatively soft materials (such as aluminum alloys). Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an internal tapered thread taper measuring device, which is designed to avoid scratching or damaging parts and is better suited for measuring the internal tapered thread taper of parts with relatively soft materials.

[0005] This utility model includes a main rod, a lever, a measuring gauge, and a measuring head assembly. The main rod is hollow, the lever is located inside the main rod, and the measuring gauge is located on one side of the main rod. The measuring end of the measuring gauge passes through the main rod and faces one end of the lever. The measuring head assembly includes a movable contact, a fixed contact, and an elastic element. The movable contact is movably located on the side of the other end of the main rod along the radial direction, and a through hole is provided on the side of the main rod at that end. The bottom of the movable contact is located along the through hole and faces the other end of the lever. The elastic element is used to drive the movable contact to move in the direction of the lever. The fixed contact is fixed on the side of the other end of the main rod, and the axes of the fixed contact and the movable contact are located on the same radial straight line passing through the axis of the main rod. A handle is also provided on the end of the lever corresponding to the measuring gauge. The handle is located on the side of the lever away from the measuring gauge and extends out of the main rod along the side of the main rod.

[0006] Furthermore, it also includes a support fixedly installed inside the main rod, the support having a movable hole, the lever passing through the movable hole, and the middle part of the lever being rotatably connected to the support via a positioning pin to form the fulcrum of the lever's rotation.

[0007] Furthermore, it also includes a positioning seat disposed on the side of the other end of the main rod. The positioning seat is coaxially provided with positioning hole one and positioning hole two. The diameter of positioning hole one is smaller than the diameter of positioning hole two. Positioning hole two is oriented towards the through hole. The movable contact passes through positioning hole one, positioning hole two and the through hole. A limiting member is provided on the side of the movable contact. The limiting member is located in positioning hole two, and the length or width of the limiting member is greater than the diameter of positioning hole one and the through hole.

[0008] Furthermore, the elastic element is a spring, which is sleeved on the movable contact and located inside the second positioning hole, and the spring is located between the limiting element and the end of the second positioning hole facing the first positioning hole.

[0009] Furthermore, the movable contact includes a contact body and a movable rod, the movable rod passing through a positioning hole, a positioning hole, and a through hole, with the bottom of the movable rod facing the other end of the lever, and the contact body being threadedly connected to the top of the movable rod.

[0010] Furthermore, the fixing contact is detachably fixed to the side of the other end of the main rod.

[0011] Furthermore, it also includes a fixing seat disposed on the side of the other end of the main rod, wherein the fixing contact is threadedly connected to the fixing seat so that the fixing contact is detachably fixed to the side of the other end of the main rod.

[0012] Furthermore, the fixed contact includes a second contact body and a connecting rod, one end of the connecting rod being threadedly connected to the fixed seat, and the second contact body being threadedly connected to the other end of the connecting rod.

[0013] Furthermore, the tops of both the movable and fixed contacts are pointed structures, and the ends of the pointed structures are spherical; the bottoms of the movable contact and the measuring end of the measuring instrument are also spherical.

[0014] Furthermore, a handle is provided at the end of the main rod that is away from the measuring head assembly.

[0015] The beneficial effects of this invention are as follows: The handle design facilitates the operator's ability to drive the lever rotation. When performing taper measurements, the lever can be pre-driven to rotate towards the measuring instrument via the handle. The movable contact, under the action of the elastic element, maintains maximum retraction, allowing the measuring head assembly to directly insert into the threaded hole without requiring the thread to compress the movable contact and retract it. This avoids scratching the threads with the movable contact, making it less likely to damage components and better suited for measuring the taper of internal tapered threads on relatively soft materials. Simultaneously, the handle also acts as a counterweight. After the measuring head assembly is inserted into the threaded hole, the lever resets and rotates towards the movable contact, causing it to extend and contact the thread tooth side. Furthermore, because this invention transmits the extension and retraction displacement of the movable contact via a lever, the resulting force is smaller than that transmitted via an inclined plane, making it less likely to damage components. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal tapered thread taper measuring device of this utility model.

[0017] Figure 2 This is a longitudinal sectional view of the internal tapered thread taper measuring device of this utility model.

[0018] Figure 3 This is a longitudinal sectional view of the measuring head assembly of this utility model.

[0019] Figure 4 This is a first schematic diagram of another embodiment of the fixed contact of this utility model.

[0020] Figure 5 This is a second schematic diagram illustrating another embodiment of the fixed contact of this utility model.

[0021] Figure 6 This is a schematic diagram of the first state when measuring the taper of this utility model.

[0022] Figure 7 This is a schematic diagram of the second state when measuring the taper according to this utility model.

[0023] Figure 8 This is a schematic diagram of the outside micrometer being zeroed using this utility model.

[0024] Figure 9 This is a schematic diagram of the aperture measurement process of this utility model.

[0025] In the diagram: 1. Main rod; 11. Positioning seat; 111. Positioning hole one; 112. Positioning hole two; 12. Fixed seat; 2. Lever; 21. Handle; 3. Measuring gauge; 4. Movable contact; 41. Contact body one; 42. Movable rod; 43. Limiting element; 5. Fixed contact; 51. Contact body two; 52. Connecting rod; 6. Elastic element; 7. Support; 71. Positioning pin; 8. Handle; 9. Outside micrometer. Detailed Implementation

[0026] like Figures 1-9 As shown, this utility model provides a device for measuring the taper of an internal tapered thread, including a main rod 1, a lever 2, a measuring gauge 3, and a measuring head assembly. The main rod 1 is hollow, and the lever 2 is disposed inside the main rod 1 and can rotate around its pivot point under the action of external force. The pivot point is located in the middle of the lever 2. The measuring gauge 3 is fixed to one end of the main rod 1 by bolts. A through groove is provided on the side of the main rod 1 at this end. The measuring end of the measuring gauge 3 passes through the through groove inside the main rod 1 and faces one end of the lever 2. The measuring head assembly includes a movable contact 4, a fixed contact 5, and an elastic element 6. The movable contact 4 is movably disposed on the side of the other end of the main rod 1, and the movable contact 4 is movable in the radial direction of the main rod 1. A through hole is provided on the side of the main rod 1 at this end, and the bottom of the movable contact 4 faces the other end of the lever 2 along the through hole. The elastic element 6 is used to drive the movable contact 4 to move in the direction of the lever 2. That is, when the movable contact 4 is not subjected to external force, the elastic element 6 can drive the movable contact 4 to retract inward towards the main rod 1. The fixed contact 5 is fixedly disposed on the side of the other end of the main rod 1, and the axes of the fixed contact 5 and the movable contact 4 are located on the same radial straight line passing through the axis of the main rod 1. The lever 2 is also provided with a handle 21 at one end corresponding to the measuring gauge 3. The handle 21 is located on the side of the lever 2 away from the measuring gauge 3, and the handle 21 extends along the side of the main rod 1 to the outside of the main rod 1.

[0027] In use, the handle 21 allows the operator to easily drive the lever 2 to rotate. When measuring taper, the handle 21 can be used to pre-drive the lever 2 to rotate towards the measuring gauge 3. Under the action of the elastic element 6, the movable contact 4 can maintain maximum retraction, allowing the measuring head assembly to directly extend into the threaded hole without needing to retract it by squeezing it through the thread. This avoids the movable contact 4 scratching the thread, making it less likely to scratch parts and better suited for measuring the taper of internal tapered threads on relatively soft materials. Simultaneously, the handle 21 also acts as a counterweight. After the measuring head assembly enters the threaded hole, the lever 2 resets and rotates towards the movable contact 4, causing it to extend and contact the thread tooth side. Because this invention transmits the extension and retraction displacement of the movable contact 4 through the lever 2, the resulting force is smaller than that transmitted through an inclined plane, making it less likely to damage parts.

[0028] Among them, the measurement table 3 is selected to use as follows: Figure 1 and Figure 4 The mechanical dial indicator or micrometer shown can also be used as... Figure 5 The electronic digital dial indicator or micrometer shown can be selected according to actual needs.

[0029] The lever 2 is specifically configured as follows: This utility model also includes a support 7, which is fixedly installed inside the main rod 1 by bolts. The support 7 has a movable hole that extends through the support 7 along the axial direction of the main rod 1. The lever 2 passes through the movable hole, and the middle part of the lever 2 is rotatably connected to the support 7 by a positioning pin 71 to form the fulcrum of the lever 2. The height of the movable hole is greater than the thickness of the lever 2 to ensure that the lever 2 can rotate normally around the fulcrum within the movable hole.

[0030] This utility model also includes a positioning seat 11, which is fixed to the side of the other end of the main rod 1 by bolts. The positioning seat 11 has a first positioning hole 111 and a second positioning hole 112 coaxially arranged on it. The diameter of the first positioning hole 111 is smaller than the diameter of the second positioning hole 112, meaning the second positioning hole 112 has a larger diameter. A stepped surface can be formed between the second positioning hole 112 and the first positioning hole 111. The second positioning hole 112 faces the through hole. The movable contact 4 passes through the first positioning hole 111, the second positioning hole 112, and the through hole. A limiting member 43 is provided on the side of the movable contact 4. The limiting member 43 is located inside the second positioning hole 112, and its length or width is greater than the diameter of the first positioning hole 111 and the through hole. Based on this arrangement, the maximum movable stroke of the movable contact 4 is effectively limited while allowing it to be movably installed radially along the main rod 1.

[0031] The elastic element 6 is specifically a spring, which is sleeved on the movable contact 4 and located within the second positioning hole 112. The spring is positioned between the limiting element 43 and the end of the second positioning hole 112 facing the first positioning hole 111. In its natural state, the spring extends, driving the movable contact 4 to move towards the lever 2. Based on this configuration, the movable contact 4 can form a guide rod during the extension and retraction of the spring, ensuring the reliability of the spring's extension and retraction.

[0032] The movable contact 4 specifically includes a contact body 41 and a movable rod 42. The movable rod 42 passes through the positioning hole 111, the positioning hole 112, and the through hole, with its bottom facing the other end of the lever 2. Specifically, in the movable contact 4, the bottom of the movable rod 42 faces the lever 2. The contact body 41 is threaded to the top of the movable rod 42. Based on this configuration, the contact body 41 can be easily replaced according to usage requirements or wear, without replacing the entire movable contact 4, thus improving the efficiency and convenience of replacing the contact body 41. In this configuration, the preferred limiting member 43 is radially inserted through the middle of the movable rod 42 and fixed thereto. The two sides of the positioning hole 112 are also recessed with limiting grooves, the dimensions of which are the same as those of the positioning hole 112 along the radial direction of the main rod 1. The two ends of the limiting member 43 are correspondingly inserted into the limiting grooves on both sides of the positioning hole 112, thus limiting the limiting member 43 circumferentially along the positioning hole 112 and restricting the rotation of the movable rod 42, facilitating the threaded connection to the contact body 41. When replacing the contact body 41, the lever 2 can be held in position by the handle 21, thereby holding the movable rod 42 in position, making it easier to disassemble and replace the contact body 41.

[0033] The fixed contact 5 is detachably fixed to the side of the other end of the main rod 1. When used for measuring the taper of internal tapered threads of parts with different hole diameters, only the fixed contact 5 of the corresponding length needs to be replaced, which can reduce the manufacturing cost of different models of measuring head assemblies. Moreover, the measuring gauge 3 is far from the measuring head assembly and does not occupy the space between the movable contact 4 and the fixed contact 5. Therefore, combined with the replaceable fixed contact 5, compared with the structure where the measuring gauge 3 is set between the fixed contact 5 and the movable contact 4, this utility model can be applied to the measurement of the taper of internal tapered threads of parts with a larger range of hole diameters.

[0034] This utility model also includes a fixing seat 12, which is disposed on the side of the other end of the main rod 1. The fixing contact 5 is threadedly connected to the fixing seat 12, so that the fixing contact 5 is detachably fixed to the side of the other end of the main rod 1. Based on this configuration, the fixing contact 5 is easy to assemble and disassemble and the connection is stable and reliable.

[0035] The fixed contact 5 specifically includes a contact body 51 and a connecting rod 52. One end of the connecting rod 52 is threadedly connected to the fixed base 12, and the other end of the contact body 51 is threadedly connected to the connecting rod 52. This design facilitates not only the replacement of the fixed contact 5 as a whole or the connecting rod 52, but also the replacement of the contact body 51 according to usage requirements or wear.

[0036] like Figure 3As shown, the tops of both the movable contact 4 and the fixed contact 5 are pointed structures, meaning the ends of both contact body 41 and contact body 51 are pointed structures, and the ends of these pointed structures are spherical. Based on this design, scratches on components are reduced while ensuring that contact body 41 and contact body 51 can extend between adjacent threads. Preferably, the bottom of the movable contact 4 and the bottom of the measuring end of the gauge 3 are both spherical, resulting in less contact friction with the lever 2.

[0037] The main rod 1 has a handle 8 at the end opposite to the measuring head assembly for easy gripping by the operator. The handle 8 is made of sponge rubber. Based on the structural design of this utility model, when the operator grips the handle 8, their thumb can directly press the handle 21.

[0038] According to GB9253.2-2022 standard, the taper of an internal tapered thread is defined as: the increase in the thread diameter or root diameter per unit length along the axial direction; the unit of taper is mm / mm or in / in. Figure 6 and Figure 7 The following are operating instructions for measuring the taper of the internal tapered thread of the component shown in this utility model. The internal tapered thread of this component is a 1:16 tapered thread with a pitch of 6 threads / in. An imperial dial indicator (range 0-1in) is selected. The specific operation is as follows:

[0039] First, select a connecting rod 52 of appropriate length and contact body 41 and contact body 51 with a ball diameter of 1.57mm at the end. Hold the handle 8 with your right hand and press the handle 21 down with your thumb to move the lever 2 towards the test gauge, causing the movable contact 4 to retract. Move the whole unit so that the end of the fixed contact 5 is engaged with the first complete thread side of the internal tapered thread. Then release the handle 21 so that the end of the movable contact 4 is engaged with the first complete thread side of the internal tapered thread. While keeping the end of the fixed contact 5 engaged with the thread side, rotate the whole unit so that the measuring contact is engaged with the thread side and rotates. Find the maximum indicated value displayed on the measuring gauge 3 and reset it to zero.

[0040] Next, grasp handle 8 with your right hand and press down on handle 21 with your thumb again, moving lever 2 towards the test gauge and causing movable contact 4 to retract. Then, move the entire assembly six threads (1 inch) axially along the threaded hole, so that fixed contact 5 engages with the seventh thread of the internal tapered thread. Release handle 21, so that the end of movable contact 4 engages with the seventh thread of the internal tapered thread. While keeping the end of fixed contact 5 engaged with the thread thread, rotate the entire assembly to rotate the measuring contact in contact with the thread thread. Find the maximum indicated value displayed on the measuring gauge 3, which is the measured internal thread taper. Figure 7 As shown, the increase in the thread pitch diameter of the internal tapered thread by 1 inch of movement along the axial direction is 0.0625 inch / inch.

[0041] Based on the above, this utility model can be used for taper measurement of NPT threads, API oil well pipe threads, and special-specification internal tapered threads. Furthermore, this utility model can also be used for measuring the inner diameter of parts and the diameter of internal grooves. Figure 9 Taking the component shown as an example, the diameter of the inner groove to be measured is 69.24mm. The specific operation is as follows:

[0042] First, adjust the distance between the anvil and the micrometer screw of the calibrated outside micrometer 9 to 69.240mm. This invention selects contact body 1 41 and contact body 2 51 with a ball diameter of 1-5mm at the end. Hold the handle 8 with your right hand and press the handle 21 down with your thumb to move the lever 2 towards the test gauge, causing the movable contact 4 to retract, so that the end of the fixed contact 5 is engaged with the anvil of the outside micrometer 9. Release the handle 21, so that the end of the movable contact 4 is engaged with the micrometer screw of the outside micrometer 9. Keep the fixed contact 5 stationary and adjust the reading of the measuring gauge 3 to zero.

[0043] Next, hold handle 8 with your right hand and press down on handle 21 with your thumb to move lever 2 towards the test gauge, causing movable contact 4 to retract. Move the whole assembly until the measuring head assembly is deep enough to reach the depth of the inner groove, so that fixed contact 5 is tangent to the circumference of the inner groove. Then release handle 21 so that movable contact 4 is tangent to the circumference of the inner groove. While keeping the end of fixed contact 5 tangent to the circumference of the inner groove, rotate the whole assembly so that movable contact 4 rotates tangent to the circumference of the inner groove. Find the maximum indicated value displayed on the measuring gauge 3. If it is +0.01mm, then the diameter of the inner groove of the component is 69.24 + 0.01 = 69.25mm.

[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. A device for measuring the taper of an internal tapered thread, characterized in that, The device includes a main rod (1), a lever (2), a measuring gauge (3), and a measuring head assembly. The main rod (1) is hollow, the lever (2) is located inside the main rod (1), and the measuring gauge (3) is located on one side of the main rod (1). The measuring end of the measuring gauge (3) passes through the main rod (1) and faces one end of the lever (2). The measuring head assembly includes a movable contact (4), a fixed contact (5), and an elastic element (6). The movable contact (4) is movably located on the side of the other end of the main rod (1) along the radial direction of the main rod (1), and the side of the main rod (1) at that end has a through hole. The bottom of the head (4) is set along the through hole toward the other end of the lever (2). The elastic element (6) is used to drive the movable contact (4) to move in the direction of the lever (2). The fixed contact (5) is fixed on the side of the other end of the main rod (1). The axis of the fixed contact (5) and the movable contact (4) are located on the same radial straight line passing through the axis of the main rod (1). The lever (2) is also provided with a handle (21) at one end corresponding to the measuring gauge (3). The handle (21) is located on the side of the lever (2) away from the measuring gauge (3). The handle (21) extends along the side of the main rod (1) to the outside of the main rod (1).

2. The internal tapered thread taper measuring device as described in claim 1, characterized in that, It also includes a support (7) fixedly installed inside the main rod (1), the support (7) is provided with a movable hole, the lever (2) passes through the movable hole, and the middle part of the lever (2) is rotatably connected to the support (7) through a positioning pin (71) to form the fulcrum of the lever (2).

3. The internal tapered thread taper measuring device as described in claim 1 or 2, characterized in that, It also includes a positioning seat (11) set on the side of the other end of the main rod (1). The positioning seat (11) is coaxially provided with a positioning hole one (111) and a positioning hole two (112). The diameter of the positioning hole one (111) is smaller than the diameter of the positioning hole two (112). The positioning hole two (112) is set towards the through hole. The movable contact (4) passes through the positioning hole one (111), the positioning hole two (112) and the through hole. The side of the movable contact (4) is provided with a limiting member (43). The limiting member (43) is located in the positioning hole two (112), and the length or width of the limiting member (43) is greater than the diameter of the positioning hole one (111) and the through hole.

4. The internal tapered thread taper measuring device as described in claim 3, characterized in that, The elastic element (6) is a spring, which is sleeved on the movable contact (4) and located in the second positioning hole (112). The spring is located between the limiting element (43) and the end of the second positioning hole (112) facing the first positioning hole (111).

5. The internal tapered thread taper measuring device as described in claim 3, characterized in that, The movable contact (4) includes a contact body (41) and a movable rod (42). The movable rod (42) passes through a positioning hole (111), a positioning hole (112) and a through hole, and the bottom of the movable rod (42) is positioned facing the other end of the lever (2). The contact body (41) is threaded to the top of the movable rod (42).

6. The internal tapered thread taper measuring device as described in any one of claims 1, 2, 4, and 5, characterized in that, The fixed contact (5) is detachably fixed to the side of the other end of the main rod (1).

7. The internal tapered thread taper measuring device as described in claim 6, characterized in that, It also includes a fixing seat (12) disposed on the side of the other end of the main rod (1), wherein the fixing contact (5) is threadedly connected to the fixing seat (12) so that the fixing contact (5) is detachably fixed to the side of the other end of the main rod (1).

8. The internal tapered thread taper measuring device as described in claim 7, characterized in that, The fixed contact (5) includes a second contact body (51) and a connecting rod (52). One end of the connecting rod (52) is threadedly connected to the fixed seat (12), and the other end of the second contact body (51) is threadedly connected to the connecting rod (52).

9. The internal tapered thread taper measuring device as described in any one of claims 1, 2, 4, 5, 7, and 8, characterized in that, The tops of the movable contact (4) and the fixed contact (5) are both pointed structures, and the ends of the pointed structures are spherical; the bottom of the movable contact (4) and the bottom of the measuring end of the measuring instrument (3) are both spherical.

10. The internal tapered thread taper measuring device as described in any one of claims 1, 2, 4, 5, 7, and 8, characterized in that, The main rod (1) has a handle (8) at the end opposite to the measuring head assembly.

Images