Pipeline inner diameter measuring tool

Abstract

The utility model relates to the technical field of measuring tools, and discloses a pipeline inner diameter measuring tool which comprises a main ruler, one end of the main ruler is provided with a depth gauge, the bottom of the other end of the main ruler is provided with an outer diameter measuring claw, and the top of the other end of the main ruler is fixedly connected with an inner diameter measuring fixing claw. According to the utility model, the measurement digital display is arranged, the circuit board is arranged inside the shell of the measurement digital display, the circuit board is provided with the two groups of moving grids, the moving grids and the fixed grids move relatively, and the capacitance between the moving grids and the fixed grids changes along with the relative displacement according to a certain rule. Under the action of driving alternating voltage, an alternating voltage signal is output on the circuit board, and the phase of the alternating voltage signal is a function of mechanical displacement x and is an approximate linear function under certain precision, so that accurate length measurement is realized in the phase modulation and demodulation process, readings are displayed on the display screen, and the effect of conveniently, quickly and accurately measuring numerical values is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a pipeline inner diameter measuring tool. Background Art

[0002] A pipeline is a device connected by pipes, pipe connectors and valves for conveying gas, liquid or fluid with solid particles. Usually, the fluid flows from the high pressure part of the pipeline to the low pressure part after being pressurized by blowers, compressors, pumps and boilers. It can also be conveyed by the fluid's own pressure or gravity. Pipelines are widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices.

[0003] At present, when measuring the inner diameter of a pipe, a vernier caliper is used to measure the size. The measurement parameters are relatively accurate and the required data can be measured accurately and quickly. However, the previous vernier caliper can accurately measure the outer diameter of the pipe, but for some pipes that need to accurately measure the inner diameter of the pipe, when using a vernier caliper to measure the inner diameter, it is often impossible to accurately find the maximum value of the inner diameter of the pipe, or because of the friction between the vernier caliper measuring claws and the inner diameter of the pipe, it is impossible to confirm whether the caliper measuring part is the inner diameter value of the pipe, which leads to inaccurate measurement of the inner diameter of the pipe. For this reason, we provide a pipe inner diameter measurement tool. Utility Model Content

[0004] The utility model aims to provide a pipeline inner diameter measuring tool to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipeline inner diameter measuring tool, comprising a main ruler, a depth gauge is arranged at one end of the main ruler, an outer diameter measuring claw is arranged at the bottom of the other end of the main ruler, and an inner diameter measuring fixed claw is fixedly connected to the top of the other end of the main ruler; two groups of fixed grids are arranged on the front of the main ruler, and they are outer diameter measuring fixed grids and inner diameter measuring fixed grids respectively, a measuring structure is arranged on the main ruler, and sliding grooves are opened on the top and bottom of the main ruler.

[0006] Preferably, the measuring structure includes: a tooth plate fixedly connected to a sliding groove at the bottom of the main scale; a gear meshingly connected to the tooth plate and located below the tooth plate; a sliding block slidably connected to the sliding groove at the top of the main scale; and a pressing plate fixedly connected to the top of the main scale.

[0007] Preferably, the gear is movably connected to the outer diameter measuring claw on the right side, a return spring is fixedly connected between the sliding block and the sliding groove located at the top of the main scale, an inner diameter measuring movable claw is fixedly installed on the top of the sliding block, one side of the inner diameter measuring movable claw is integrally connected with a tail block, and the tail block and the pressing plate are fastened and installed by a fastening screw.

[0008] Preferably, a measurement digital display structure is provided on the tail block.

[0009] Preferably, the measurement digital display structure includes:

[0010] The measuring digital display housing has a circuit board disposed inside the housing and two sets of moving grids disposed on the circuit board; the fixing plate is integrally connected to the top of the measuring digital display housing and fixedly connected to the tail block by screws.

[0011] Preferably, the front of the measurement digital display housing is provided with a foot-millimeter switching unit button, a display screen, an "ON / OFF" button, and a return to zero button, and the foot-millimeter switching unit button, the display screen, the "ON / OFF" button, and the return to zero button are all electrically connected to the circuit board.

[0012] Preferably, a battery compartment is provided on the front side of the housing of the measurement digital display, and a button battery is arranged in the battery compartment, and the button battery is installed in the battery compartment through a button battery installation shell.

[0013] The utility model provides a pipeline inner diameter measuring tool, which has the following beneficial effects:

[0014] (1) The utility model allows the user to move the outer diameter measuring claw on the right side, and the gear inside it slides on the toothed plate, thereby measuring the outer diameter of the pipeline; by screwing and loosening the fastening screw, the inner diameter measuring movable claw on the sliding block can be moved under the rebound characteristics of the reset spring, thereby measuring the inner diameter of the pipeline, thereby achieving the effect of measuring the inner diameter of the pipeline.

[0015] (2) The utility model is provided with a measuring digital display. A circuit board is provided inside the housing of the measuring digital display. The circuit board is provided with two sets of moving grids. The moving grids move relative to the fixed grids. The capacitance between the moving grids and the fixed grids changes according to a certain rule as the relative displacement thereof. Under the action of the driving AC voltage, an AC voltage signal is outputted on the circuit board. The phase thereof is a function of the mechanical displacement x. It is approximately a linear function under a certain accuracy. Thus, accurate length measurement is realized in the process of phase modulation and demodulation, and the reading is displayed on the display screen, achieving the effect of convenient, fast and accurate measurement of numerical values. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0017] Figure 2 This is a front view of the overall structure of the utility model;

[0018] Figure 3 This is a cross-sectional view of the overall structure of the utility model;

[0019] Figure 4 For this utility model Figure 3 A magnified view of center.

[0020] In the figure: 111 main ruler, 112 depth gauge, 113 outer diameter measuring claw, 114 inner diameter measuring fixed claw, 2 measuring structure, 211 tooth plate, 212 gear, 213 sliding block, 214 return spring, 215 inner diameter measuring movable claw, 216 tail block, 217 fastening screw, 218 pressing piece, 3 measuring digital display structure, 311 measuring digital display housing, 312 fixing plate, 313 foot-millimeter unit switching button, 314 display screen, 315 "ON / OFF" button, 316 return to zero button, 317 button battery installation shell. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Example 1

[0024] A preferred embodiment of a pipeline inner diameter measuring tool provided by the utility model is as follows: Figure 1-4 As shown: a pipeline inner diameter measuring tool, comprising a main ruler 111, a depth gauge 112 is arranged at one end of the main ruler 111, an outer diameter measuring claw 113 is arranged at the bottom of the other end of the main ruler 111, and an inner diameter measuring fixed claw 114 is fixedly connected to the top of the other end of the main ruler 111; two sets of fixed grids are arranged on the front of the main ruler 111, and they are outer diameter measuring fixed grids and inner diameter measuring fixed grids respectively, a measuring structure 2 is arranged on the main ruler 111, and sliding grooves are opened on the top and bottom of the main ruler 111;

[0025] The measuring structure 2 includes: a tooth plate 211, fixedly connected to the sliding groove at the bottom of the main scale 111; a gear 212, meshingly connected with the tooth plate 211 and located below the tooth plate 211; a sliding block 213, slidably connected to the sliding groove at the top of the main scale 111; a pressing plate 218, fixedly connected to the top of the main scale 111; the gear 212 is movably connected to the outer diameter measuring claw 113 on the right side, a return spring 214 is fixedly connected between the sliding block 213 and the sliding groove at the top of the main scale 111, an inner diameter measuring movable claw 215 is fixedly installed on the top of the sliding block 213, and a tail block 216 is integrally connected to one side of the inner diameter measuring movable claw 215, and the tail block 216 and the pressing plate 218 are fastened and installed by a fastening screw 217;

[0026] Furthermore, in this embodiment, by the user moving the outer diameter measuring claw 113 on the right side, the gear 212 inside thereof slides on the tooth plate 211, thereby measuring the outer diameter of the pipe;

[0027] Furthermore, in this embodiment, by screwing and loosening the fastening screw 217 and utilizing the rebound characteristics of the reset spring 214 , the inner diameter measuring movable claw 215 on the sliding block 213 can be moved, thereby measuring the inner diameter of the pipeline.

[0028] Example 2

[0029] Based on Example 1, a preferred embodiment of a pipeline inner diameter measuring tool provided by the utility model is as follows: Figure 1-4 As shown: a measuring digital display structure 3 is arranged on the tail block 216; the measuring digital display structure 3 includes: a measuring digital display housing 311, a circuit board is arranged inside the measuring digital display housing 311, and two sets of moving grids are arranged on the circuit board; a fixing plate 312 is integrally connected to the top of the measuring digital display housing 311, and is fixedly connected to the tail block 216 by screws; a foot-millimeter switching unit button 313, a display screen 314, an "ON / OFF" button 315, and a return to zero button 316 are arranged on the front of the measuring digital display housing 311, and the foot-millimeter switching unit button 313, the display screen 314, the "ON / OFF" button 315, and the return to zero button 316 are all electrically connected to the circuit board; a battery compartment is opened on the front of the measuring digital display housing 311, and a button battery is arranged in the battery compartment, and the button battery is installed in the battery compartment through a button battery installation shell 317.

[0030] Furthermore, in this embodiment, by moving the outer diameter measuring claw 113 and the inner diameter measuring movable claw 215 on the sliding block 213 back and forth, since a circuit board is provided inside the measuring digital display housing 311, and the circuit board is provided with two sets of moving grids, the moving grids and the fixed grids move relative to each other, and the capacitance between the moving grids and the fixed grids changes according to a certain rule as the relative displacement thereof. Under the action of the driving AC voltage, an AC voltage signal is outputted on the circuit board, and its phase is a function of the mechanical displacement x, which is approximately a linear function under a certain accuracy, thereby realizing accurate length measurement in the phase modulation and demodulation process, and displaying the reading on the display screen 314, wherein the unit switching is performed through the foot and millimeter switching unit button 313, the measuring digital display is turned on or off through the "ON / OFF" button 315, and the data is returned to zero through the return to zero button 316.

[0031] When in use, by moving the outer diameter measuring claw 113 and the inner diameter measuring movable claw 215 on the sliding block 213 back and forth, since a circuit board is provided inside the measuring digital display housing 311, and the circuit board is provided with two sets of moving grids, the moving grids and the fixed grids move relative to each other, and the capacitance between the moving grids and the fixed grids changes according to a certain rule as the relative displacement thereof. Under the action of the driving AC voltage, an AC voltage signal is outputted on the circuit board, and its phase is a function of the mechanical displacement x, which is approximately a linear function under a certain accuracy, thereby realizing accurate length measurement in the process of phase modulation and demodulation, and displaying the reading on the display screen 314.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pipeline inner diameter measuring tool, comprising a main ruler (111), characterized in that: A depth gauge (112) is provided at one end of the main ruler (111), an outer diameter measuring claw (113) is provided at the bottom of the other end of the main ruler (111), and an inner diameter measuring fixed claw (114) is fixedly connected to the top of the other end of the main ruler (111); two groups of fixed grids are provided on the front of the main ruler (111), which are outer diameter measuring fixed grids and inner diameter measuring fixed grids respectively; a measuring structure (2) is provided on the main ruler (111), and sliding grooves are provided at the top and bottom of the main ruler (111).

2. A pipeline inner diameter measuring tool according to claim 1, characterized in that: The measuring structure (2) comprises: A tooth plate (211) is fixedly connected to a sliding groove at the bottom of the main scale (111); A gear (212) meshingly connected with the tooth plate (211) and located below the tooth plate (211); A sliding block (213) is slidably connected to a sliding groove located at the top of the main ruler (111); The pressing sheet (218) is fixedly connected to the top of the main ruler (111).

3. A pipeline inner diameter measuring tool according to claim 2, characterized in that: The gear (212) is movably connected to the outer diameter measuring claw (113) on the right side; a return spring (214) is fixedly connected between the sliding block (213) and the sliding groove located at the top of the main scale (111); an inner diameter measuring movable claw (215) is fixedly installed on the top of the sliding block (213); a tail block (216) is integrally connected to one side of the inner diameter measuring movable claw (215); and the tail block (216) and the pressing plate (218) are fastened and installed by a fastening screw (217).

4. A pipeline inner diameter measuring tool according to claim 3, characterized in that: The tail block (216) is provided with a measurement digital display structure (3).

5. A pipeline inner diameter measuring tool according to claim 4, characterized in that: The measurement digital display structure (3) comprises: A measurement digital display housing (311), wherein a circuit board is arranged inside the measurement digital display housing (311), and two sets of moving grids are arranged on the circuit board; The fixing plate (312) is integrally connected to the top of the measuring digital display housing (311), and is fixedly connected to the tail block (216) by screws.

6. A pipeline inner diameter measuring tool according to claim 5, characterized in that: The front of the measurement digital display housing (311) is provided with a foot-millimeter switching unit button (313), a display screen (314), an "ON / OFF" button (315), and a return to zero button (316), and the foot-millimeter switching unit button (313), the display screen (314), the "ON / OFF" button (315), and the return to zero button (316) are all electrically connected to the circuit board.

7. A pipeline inner diameter measuring tool according to claim 5, characterized in that: A battery compartment is provided on the front of the measurement digital display housing (311), and a button battery is arranged in the battery compartment. The button battery is installed in the battery compartment via a button battery installation shell (317).

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