Narrow space gap measuring device

Abstract

A narrow space gap measuring device comprises a piston type measuring head, a cable tube bundle and an operation display terminal. The piston type measuring head comprises a cylinder, a grating ruler is installed on a piston cylinder of the cylinder in the length direction, and a grating reading head of the grating ruler is connected with the end of a piston rod of the cylinder through a rod piece and telescopically slides along with the piston rod. One end of the cable tube bundle is connected with the piston type measuring head, the other end of the cable tube bundle is connected with the operation display terminal, and an LED lamp is fixed outside the cable tube bundle; a micro pneumatic pump is arranged in the operation display terminal and connected with the air cylinder through an air inlet pipe. The narrow space gap measuring device provided by the utility model can accurately measure a gap value.

Description

Technical Field

[0001] The utility model relates to a measuring device, in particular to a narrow space gap measuring device. Background Art

[0002] The hydroelectric generator set in the hydropower industry is composed of rotating parts and fixed parts. The rotating parts and fixed parts are designed with matching clearances. These clearances need to be controlled within a certain range during installation. The gaps that need to be measured in the hydroelectric generator set include leak-proof ring clearance, guide vane clearance, air gap, etc. Among them, the air gap (17~33mm) uses a plug gauge to insert the wedge-tight gap, mark the relative position marks on the two inclined wedges on the plug gauge, take out the plug gauge from the gap and restore the position of the two inclined wedges according to the marks, and then use a vernier caliper to measure the thickness of the wedge and record it as the gap value at the measuring point. In the above measurement process, there are errors such as inaccurate restoration of the position according to the marks and indirect measurement of the plug gauge measurement. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a narrow space gap measuring device, which is simple to operate, is not limited by the depth of the air gap, and can accurately measure the air gap value.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A narrow space gap measuring device, comprising a piston probe, a cable bundle, and an operation display terminal;

[0006] The piston probe comprises a cylinder, a grating ruler is installed on the piston of the cylinder along the length direction, and the grating reading head of the grating ruler is connected to the piston rod end of the cylinder through a rod and slides with the extension and contraction of the piston rod;

[0007] One end of the cable bundle is connected to the piston probe, and the other end is connected to the operation display terminal, and an LED light is fixed outside the cable bundle;

[0008] A micro pneumatic pump is arranged in the operation display terminal, and the micro pneumatic pump is connected to the cylinder through an air inlet pipe.

[0009] The rod is an L-shaped pull rod.

[0010] An LED lamp is installed on the cylinder.

[0011] A spring is installed at the bottom of the piston cylinder, the spring is connected to the piston rod, and an air inlet hole is arranged on one end of the piston cylinder away from the spring, and the air inlet hole is communicated with the air inlet pipe.

[0012] A limiting ring is provided in the cavity located on one side of the spring in the piston cylinder. When the piston rod contacts the limiting ring, the grating reading head of the grating ruler 1 is reset.

[0013] The inner length of the piston cylinder matches the length of the piston rod; when the piston rod contacts the inner bottom surface of the piston cylinder, the grating reading head of the grating ruler is reset.

[0014] The cable bundle is coated with a braided layer.

[0015] The utility model provides a narrow space gap measuring device, which has the following technical effects:

[0016] 1) The air gap measurement accuracy can be improved to micron level as needed.

[0017] 2) The size of the measuring device is reduced by using an ingenious structure, so that the measurement of narrow gaps does not require indirect measurement methods, and the gap value at each point deep in the gap can be measured, so that the gap at each point in the narrow gap can be truly reflected.

[0018] 3) The device is a set of flexible combined instruments, which is easy to carry and can be used to carry out gap measurements in a small space, overcoming the difficulty of entering a small space to carry out deep gap measurements.

[0019] 4) The measuring head is integrated with an LED light, which illuminates the vicinity of the measured point at a close distance, allowing the surveyor to observe the situation of the measured point more clearly and judge the accuracy of the measurement data. In addition, the internal situation of the gap can be checked while the measuring head is sent to the measuring point. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a working schematic diagram of the utility model.

[0022] Figure 2 It is a schematic diagram of the utility model.

[0023] Figure 3 This is a schematic diagram of the first state of the utility model.

[0024] Figure 4 This is a schematic diagram of the second state of the utility model.

[0025] In the figure: scale grating 1, piston cylinder 2, spring 3, operation display terminal 4, cable bundle 5, air inlet 6, piston rod 7, LED light 8, L-shaped pull rod 9, limit ring 10. DETAILED DESCRIPTION

[0026] like Figure 1-4 As shown, a narrow space gap measuring device is divided into three parts, namely a piston probe, a cable bundle, and an operation display terminal.

[0027] The piston type probe consists of a grating ruler 1, a piston cylinder 2, a spring 3, an air inlet hole 6, a piston rod 7, and an LED lamp 8.

[0028] The bottom of the piston cylinder 2 is hollow, the cross-shaped center supports and fixes the spring 3, the piston bottom of the piston rod 7 is hollow, and the spring 3 is inserted into the piston bottom of the piston rod 7. The front of the piston of the piston rod 7 is a plane center connecting rod body, and the rod body of the piston rod 7 passes through the top of the piston cylinder 2.

[0029] The grating ruler 1 is mounted on the piston cylinder 2 and arranged along the length direction of the piston cylinder 2. The grating reading head of the grating ruler 1 (composed of a scale grating and a grating reading head) is connected to the rod end of the piston rod 7 through an L-shaped pull rod 9.

[0030] An air inlet 6 is provided at one end of the piston of the piston rod 7 on the piston cylinder 2, and the air inlet 6 is connected to a micro pneumatic pump through an air inlet pipe. The micro pneumatic pump supplies air to control the contraction of the piston rod 7. After the piston rod 7 is contracted and reset, the piston of the piston rod 7 is restricted by the limit ring 10 in the piston cylinder 2 and stops, and the grating reading head of the grating ruler 1 is also reset.

[0031] In the present technical solution, the limit ring 10 can also be omitted, and the length of the piston cylinder 2 can be reasonably designed so that after the piston rod 7 is retracted and reset, the piston of the piston rod 7 is restricted by the bottom surface of the piston cylinder 2 and stops, and the grating reading head of the grating ruler 1 is also reset.

[0032] like Figure 3 As shown, when the piston rod 7 is retracted and restored, the overall length of the piston cylinder 2 and the piston rod 7 is L1.

[0033] LED lights 8 are distributed outside the piston cylinder 2 to illuminate the deep part of the gap, making it easier to select a suitable measuring point.

[0034] The cable bundle 5 is composed of an air inlet pipe, a data acquisition cable, an LED light power supply cable, and an LED light 8. The cable bundle is wrapped with a braid to increase the tensile strength of the cable bundle. The upper end of the cable bundle 5 is connected to the operation display terminal 4, and the lower end is connected to the piston probe. The air inlet pipe supplies air to the piston chamber in the piston cylinder 2; the data acquisition cable is connected to the grating ruler 1 to transmit the data collected by the grating ruler 1 to the operation display terminal; the LED light cable supplies power to the piston probe and the LED light 8 on the cable bundle to illuminate the measured gap. The braid on the outside of the cable bundle is reliably connected to the outside of the piston to bear the weight of the piston probe.

[0035] The operation display terminal 4 includes a micro pneumatic pump, a display / input module, a power module, a Bluetooth transmission module, a control module, and the like.

[0036] The operation display terminal is also provided with a raster processor and a storage unit;

[0037] The power module is respectively connected to the micro pneumatic pump, the display / input module, the storage unit, the Bluetooth transmission module, the grating processor, the control module, and the LED lamp 8;

[0038] The grating processor is connected to the grating ruler 1;

[0039] The control module is respectively connected to the micro pneumatic pump, the display / input module, and the Bluetooth transmission module;

[0040] The micro pneumatic pump is connected to the air inlet pipe, an exhaust valve is arranged on the air inlet pipe, the exhaust valve is closed, the micro pneumatic pump is turned on, and the micro pneumatic pump inflates the piston cylinder 2 to push the piston rod 7 to contract;

[0041] The display / input module can manually input the measurement point number, manually confirm and delete data, and combine with the Bluetooth transmission module to output measurement data to a mobile phone or tablet computer; the power module provides power for the micro pneumatic pump and LED light.

[0042] The power module adopts lithium battery;

[0043] The grating processor adopts KERUY DP3000 grating processor.

[0044] The grating processor is integrated and installed in the operation display terminal to form an industrial control terminal, and the industrial control terminal realizes the functions of grating data display, data storage, data editing, and data Bluetooth transmission.

[0045] Working principle and process:

[0046] 1) Start the micro pneumatic pump on the operation display terminal 4, the piston rod 7 contracts and resets, and drives the grating ruler 1 to reset. At this time, the value displayed on the display / input module of the operation display terminal 4 is L1.

[0047] 2) Turn on the LED light 8, pull the cable bundle 5 into the gap to be measured, or put the piston probe into the gap to be measured with the help of the support rod; turn off the micro pneumatic pump, open the exhaust valve, and push the piston rod 7 to move rightward under the action of the spring 3 (the spring 3 should be of greater elasticity) to discharge the gas inside the right piston chamber of the piston cylinder 2. The grating reading head will also move rightward during the movement of the piston rod 7 to the right. Finally, the piston probe is pressed against the objects at both ends of the gap to be measured. At this time, the value displayed on the display / input module of the operation display terminal 4 is L1+L2. L1+L2= L0 (the width of the gap to be measured).

[0048] 3) Then, the exhaust valve can be closed and the micro starter pump can be turned on. The gas enters the right piston chamber of the piston cylinder 2 through the air inlet pipe and pushes the piston rod 7 to contract. In this way, the piston probe can be easily moved in the measured gap. The cable bundle 5 can be pulled or the piston probe can be moved to the next measuring point with the help of the support rod.

[0049] 4) According to the gap measurement depth requirements, cable bundles of different lengths can be selected for installation. By changing the length of the cable bundle, the gap values ​​at different depths can be measured.

Claims

1. A narrow space gap measurement device, characterized in that: It includes a piston probe, a cable bundle (5), and an operation display terminal (4); The piston type measuring head comprises a cylinder, a grating ruler (1) is installed on the piston cylinder (2) of the cylinder along the length direction, and the grating reading head of the grating ruler (1) is connected to the end of the piston rod (7) of the cylinder through a rod and slides with the piston rod (7); One end of the cable bundle (5) is connected to the piston probe, and the other end is connected to the operation display terminal (4); an LED lamp (8) is fixed outside the cable bundle (5); The operation display terminal (4) is provided with a micro pneumatic pump, which is connected to the cylinder via an air inlet pipe.

2. A narrow space gap measurement device according to claim 1, characterized in that: The rod member is an L-shaped pull rod (9).

3. The narrow space gap measuring device according to claim 1, characterized in that: An LED lamp (8) is installed on the cylinder.

4. The narrow space gap measuring device according to claim 1, characterized in that: A spring (3) is installed at the bottom of the piston cylinder (2), the spring (3) is connected to the piston rod (7), and an air inlet hole (6) is provided at one end of the piston cylinder (2) away from the spring (3), and the air inlet hole (6) is connected to the air inlet pipe.

5. The narrow space gap measuring device according to claim 1, characterized in that: A limiting ring (10) is provided in a cavity located on one side of the spring (3) in the piston cylinder (2); when the piston rod (7) contacts the limiting ring (10), the grating reading head of the grating ruler (1) is reset.

6. The narrow space gap measuring device according to claim 1, characterized in that: The inner length of the piston cylinder (2) matches the length of the piston rod (7); when the piston rod (7) contacts the inner bottom surface of the piston cylinder (2), the grating reading head of the grating ruler (1) is reset.

7. The narrow space gap measuring device according to claim 1, characterized in that: The cable bundle (5) is coated with a braided layer.

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