Portable blind hole depth measuring tool

Abstract

The utility model discloses a portable blind hole depth measuring tool, and mainly relates to the technical field of hole depth measurement. Comprising a plurality of feeler lever units which are sequentially connected from top to bottom, every two adjacent feeler lever units are detachably connected, a control module is arranged on the top of the feeler lever unit at the uppermost end, a laser reflecting plate is arranged on the feeler lever unit at the uppermost end in a sliding mode, and a laser distance measuring sensor is arranged above the laser reflecting plate. The laser distance measuring sensor is fixed at the bottom of the control module, each probe rod unit comprises a metal shell, a conductor and a resistor are arranged in the metal shell, the resistors in all the probe rod units are connected in parallel or in series, and an insulating filling layer is filled between the inner wall of the metal shell and the outer wall of the conductor; the depth of the reserved blind hole in the equipment can be conveniently measured, the precision is high, the efficiency is high, and the operation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hole depth measurement, in particular to a portable blind hole depth measurement tool. Background Art

[0002] At present, blind holes are reserved on some equipment used in power engineering, but the reserved blind holes often do not match the on-site conditions. Therefore, when using them, it is necessary to measure the depth of the reserved blind holes on these equipment. If the blind hole is shallow, a vernier caliper is often used on-site to measure it. In this case, the measurement result is relatively accurate. However, if the blind hole is deep, a steel bar or other long object is often used on-site to penetrate the hole for comparison, and then the depth of the steel bar is measured. This measurement method is very prone to errors and has low accuracy. There are also rope measurement and laser rangefinder measurement methods for measuring hole depth. The rope measurement method is: manually put the rope at the bottom of the hole, read the scale on the rope, and then extract the rope. This method has low measurement efficiency, takes a long time, and has low measurement efficiency. When using a laser rangefinder for direct measurement, it is difficult to ensure that the propagation direction of the laser is parallel to the hole wall, so that the laser easily hits the hole wall and returns and cannot reach the bottom of the hole directly, resulting in inaccurate measurement results, requiring multiple measurements, and low measurement efficiency. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art and provide a portable blind hole depth measuring tool, which can facilitate the measurement of the depth of the blind hole reserved on the equipment, has high precision, high efficiency and is easy to operate.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A portable blind hole depth measuring tool comprises a plurality of probe rod units connected in sequence from top to bottom, two adjacent probe rod units are detachably connected, a control module is provided on the top of the uppermost probe rod unit, a laser reflection plate is slidably provided on the uppermost probe rod unit, a laser ranging sensor is provided above the laser reflection plate, and the laser ranging sensor is fixed to the bottom of the control module, the probe rod unit comprises a metal shell, a conductor and a resistor are provided in the metal shell, all the resistors in the probe rod units are connected in parallel or in series, and an insulating filling layer is filled between the inner wall of the metal shell and the outer wall of the conductor.

[0006] Preferably, one end of the probe rod unit is provided with an external threaded metal connection structure, and the other end is provided with an internal threaded metal connection structure adapted to the external threaded metal connection structure.

[0007] Preferably, the metal shell is a stainless steel shell.

[0008] Preferably, one end of the resistor is connected to the conductor, and the other end is connected to the metal casing. When the probe rod units are connected as one, the resistors in all the probe rod units are connected in parallel. The total resistance value of the parallel resistors is detected by the control module to determine how many probe rod units are used.

[0009] Preferably, the resistance of the resistor is 1000 ohms.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. High precision: The utility model adopts a high-precision laser distance sensor, which makes the measurement more intuitive and avoids the errors caused by many manual measurements.

[0012] 2. High efficiency and easy operation: This utility model can measure and read directly with one button, which saves manpower and is more efficient than the traditional method.

[0013] 3. Higher digitization: The utility model can also add a data processing and storage module, which can number and archive the measured data. After the measurement is completed, the series of data measured this time can be exported in TXT format through the USB data port prefabricated on the control module, which is convenient for subsequent data processing and report generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the uppermost probe unit of the utility model;

[0015] Figure 2 It is a structural schematic diagram of a common probe rod unit of the utility model.

[0016] Numbers in the attached drawings: 1. probe unit; 11. metal casing; 12. conductor; 13. resistor; 14. insulating filling layer; 15. external thread metal connection structure; 16. internal thread metal connection structure; 2. control module; 3. laser reflection plate; 4. laser ranging sensor. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0018] Example: As shown in the attached Figure 1-2The utility model is a portable blind hole depth measuring tool, comprising a plurality of probe rod units 1 connected in sequence from top to bottom, each probe rod unit 1 has the same length, two adjacent probe rod units 1 can be detachably connected, two adjacent probe rod units 1 can be connected in a plug-in manner, a plug connector can be provided at one end of the probe rod unit 1, and a plug hole can be provided at the other end. Preferably, in order to ensure the stability of the connection between the two adjacent probe rod units, one end of the probe rod unit 1 is provided with an external threaded metal connection structure 15, the external threaded metal connection structure 15 is a metal threaded column, and the other end is provided with an internal threaded metal connection structure 16 adapted to the external threaded metal connection structure 15, the internal threaded metal connection structure 16 is a metal threaded sleeve.

[0019] A control module 2 is provided on the top of the probe rod unit 1 at the uppermost end, and a laser reflector plate 3 is slidably provided on the probe rod unit 1 at the uppermost end. The probe rod composed of several probe rod units 1 is inserted into the blind hole, and the laser reflector plate 3 can slide up and down along the uppermost probe rod unit 1 to adjust the position of the laser reflector plate 3 so that the laser reflector plate 3 is located at the top of the blind hole.

[0020] A laser ranging sensor 4 is provided above the laser reflecting plate 3 and fixed at the bottom of the control module 2. The laser ranging sensor 4 is used to measure the distance between the laser reflecting plate 3 and the laser ranging sensor 4, and then the length of the portion of the probe rod located outside the blind hole is obtained. The depth of the blind hole can be obtained by subtracting the length of the portion of the probe rod located outside the blind hole from the total length of the probe rod unit 1 used.

[0021] The probe unit 1 includes a metal shell 11. Preferably, in order to ensure the service life, the metal shell 11 is a stainless steel shell.

[0022] The metal shell 11 is provided with a conductor 12 and a resistor 13. The resistors 13 in all the probe rod units 1 are connected in parallel or in series. An insulating filling layer 14 is filled between the inner wall of the metal shell 11 and the outer wall of the conductor 12. The total resistance value of all the probe rod units 1 is measured by the control module 2 to determine how many probe rod units 1 are used.

[0023] Preferably, in order to facilitate the determination of the number of probe rod units, one end of the resistor 13 is connected to the conductor 12, and the other end is connected to the metal shell 11. When the adopted probe rod units 1 are connected as one, the resistors 13 in all adopted probe rod units 1 are connected in parallel. By detecting the total resistance value of the parallel resistors 13 by the control module 2, it can be determined how many probe rod units 1 are adopted.

[0024] Preferably, the resistance of the resistor 13 is 1000 ohms.

[0025] Measurement method;

[0026] The aperture of the blind hole reserved for the equipment is often relatively small, perhaps only a dozen millimeters. If laser or guided wave radar is used for direct measurement, large errors are very likely to occur. Therefore, the utility model chooses to use a probe rod to measure the depth of the blind hole. A probe rod composed of several probe rod units 1 is extended to the bottom of the blind hole, and a slidable laser reflector plate 3 is set on the probe rod. The distance from the laser ranging sensor 4 to the laser reflecting plate 3 is measured by a high-precision laser ranging sensor 4, and then the depth of the blind hole is calculated.

[0027] The probe unit 1 is one of the core components of the utility model. In order to meet the characteristics of the small aperture of the blind hole on site, the probe unit 1 of the utility model is designed with a diameter of 6mm. The probe unit 1 adopts a stainless steel shell on the outside, and a full-length conductor 12 is inside. The conductor 12 and the stainless steel shell are filled with insulating materials. The conductor 12 is connected with the external thread metal connection structure 15 and the internal thread metal connection structure 16 at the corresponding end. A 1000-ohm resistor 13 is set between the conductor 12 and the stainless steel shell. The stainless steel shell and the internal conductor 12 of the uppermost probe unit 1 are connected to the control module 2. The control module 2 determines the number of connected probe units 1 by measuring the resistance value in the loop. The uppermost probe unit 1 is used as the main probe, and the other probe units 1 are used as probe accessories. If the resistance in the loop is 1000 ohms, it means that no probe accessory is connected, and only one probe unit 1 is used. If it is 500 ohms, it means that one probe accessory is connected, that is, two probe units 1 are used. The more probe units 1 are connected, the smaller the resistance will be.

[0028] The control flow of control module 2 is:

[0029] 1) Start measurement: Start measurement by pressing the start button on the control module.

[0030] 2) Probe circuit resistance measurement: measure the resistance value in the probe circuit.

[0031] 3) Range selection: Determine the range by measuring the resistance value in the circuit to determine the number of probe units connected.

[0032] 4) Calculation of blind hole depth: The controller reads the data of the laser distance sensor 4 and calculates the blind hole depth based on the range.

[0033] 5) Data storage: number and archive the measurement results;

[0034] 6) Data output: Select the data to be output and generate the output in TXT document format.

Claims

1. A portable blind hole depth measuring tool, characterized in that: The invention comprises a plurality of probe rod units (1) connected in sequence from top to bottom, wherein two adjacent probe rod units (1) are detachably connected, a control module (2) is arranged on the top of the uppermost probe rod unit (1), a laser reflection plate (3) is slidably arranged on the uppermost probe rod unit (1), a laser distance measuring sensor (4) is arranged above the laser reflection plate (3), and the laser distance measuring sensor (4) is fixed to the bottom of the control module (2), the probe rod unit (1) comprises a metal shell (11), a conductor (12) and a resistor (13) are arranged in the metal shell (11), and all the resistors (13) in the probe rod units (1) are connected in parallel or in series, and an insulating filling layer (14) is filled between the inner wall of the metal shell (11) and the outer wall of the conductor (12).

2. A portable blind hole depth measuring tool according to claim 1, characterized in that: One end of the probe rod unit (1) is provided with an external thread metal connection structure (15), and the other end is provided with an internal thread metal connection structure (16) adapted to the external thread metal connection structure (15).

3. A portable blind hole depth measuring tool according to claim 1, characterized in that: The metal shell (11) is a stainless steel shell.

4. A portable blind hole depth measuring tool according to claim 1, characterized in that: One end of the resistor (13) is connected to the conductor (12), and the other end is connected to the metal housing (11). When the probe rod units (1) are connected as one, the resistors (13) in all the probe rod units (1) are connected in parallel. The total resistance value of the parallel resistors (13) is detected by the control module (2), so that it can be determined how many probe rod units (1) are used.

5. The portable blind hole depth measuring tool according to claim 1, characterized in that: The resistance of the resistor (13) is 1000 ohms.

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