A device for measuring the perpendicularity of a recess of a compressor piston

Abstract

The utility model relates to a kind of perpendicularity measuring devices of recess of compressor piston, including rack, datum platform, measuring spindle, pneumatic instrument, the datum platform is horizontally arranged on the rack, the measuring spindle is vertically arranged on the datum platform, the inside of the measuring spindle is provided with airflow channel along the axial direction, one end of the measuring spindle is provided with the air inlet interface that is connected with the airflow channel, gas nozzle that is connected with the airflow channel is provided on the outside wall of the measuring spindle, the end of the measuring spindle away from the air inlet interface is used for the recess of piston is inserted therein and forms clearance fit, the pneumatic instrument is connected with the end of the measuring spindle away from the air inlet interface by hose. The perpendicularity measuring device of recess of compressor piston of the utility model can efficiently and accurately measure the perpendicularity of recess of compressor piston, greatly improve the detection efficiency, and ensure the quality of compressor piston.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic measurement equipment technology, and in particular to a device for measuring the perpendicularity of the groove of a compressor piston. Background Technology

[0002] In the development of compressors, as the energy efficiency requirements of product structures become increasingly stringent, the assembly precision of compressor pump body components directly affects product energy efficiency. The piston is the core component used to compress gas during compressor operation. A common compressor piston is a ring-shaped structure with a central through-hole, primarily driven by a crankshaft to rotate, which in turn pushes a slider against the piston's outer periphery to perform compression. The outer periphery of the piston has radially recessed grooves that extend through both axial ends. These grooves are cylindrical, approximately 3mm in diameter, and require high perpendicularity accuracy. Current methods for testing the perpendicularity of piston grooves typically involve direct insertion of the workpiece for approximate measurement, resulting in coarse measurements that cannot meet high-precision requirements. Utility Model Content

[0003] Based on this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a device for measuring the perpendicularity of the groove of a compressor piston, which can efficiently and accurately measure the perpendicularity of the groove of the compressor piston, greatly improve the detection efficiency, and ensure the quality of the compressor piston.

[0004] To achieve the above objectives, this utility model provides a device for measuring the perpendicularity of the groove of a compressor piston, including a frame, a reference platform, a measuring spindle, and a gas-electric meter. The reference platform is horizontally mounted on the frame, and the measuring spindle is vertically mounted on the reference platform. An airflow channel is axially arranged inside the measuring spindle. One end of the measuring spindle has an air inlet that communicates with the airflow channel. An air nozzle that communicates with the airflow channel is provided through the outer wall of the measuring spindle. The end of the measuring spindle away from the air inlet is used for the groove of the piston to be inserted into it and form a clearance fit. The gas-electric meter is connected to the end of the measuring spindle away from the air inlet via a flexible hose.

[0005] Therefore, according to the compressor piston groove perpendicularity measuring device of this utility model, the perpendicularity of the piston groove can be measured by the cooperation between the measuring spindle, piston, reference platform, and gas-electric meter. Specifically, the piston groove is inserted into the measuring spindle, and the outer wall of the measuring spindle and the inner wall of the piston groove form a clearance fit. An air supply device is connected at the air inlet so that the airflow enters the airflow channel of the measuring spindle from the air inlet and is ejected from the air nozzle of the measuring spindle. Due to the clearance fit between the measuring spindle and the piston groove, the airflow from the air nozzle forms... The intermittent airflow passes through the upper end of the measuring spindle and enters the gas-electric meter via a flexible hose. The pneumatic converter inside the gas-electric meter converts the airflow flow and pressure values ​​into measured values ​​in real time and displays them on the gas-electric meter. During the measurement process, the piston can be rotated so that the piston slowly rotates around the measuring spindle, so that different areas of the piston groove correspond to the air nozzles, thereby making the measurement values ​​more accurate. In other words, the perpendicularity measuring device for the groove of the compressor piston of this utility model can efficiently and accurately measure the perpendicularity of the groove of the compressor piston, greatly improving the detection efficiency and ensuring the quality of the compressor piston.

[0006] In one embodiment, the lower end of the measuring spindle passes through the reference platform and the frame and is provided with the air inlet. The upper end of the measuring spindle extends vertically upward above the reference platform, and the height of the measuring spindle extending above the reference platform is greater than the length of the groove of the piston.

[0007] In one embodiment, an exhaust groove is recessed on the outer wall of the portion of the measuring spindle that extends out of the reference platform. The length direction of the exhaust groove is parallel to the axial direction of the measuring spindle, and the lower end of the exhaust groove extends through the reference platform, while the upper end of the exhaust groove extends through the top end of the measuring spindle.

[0008] In one embodiment, two exhaust grooves are arranged relatively parallel to each other on the outer side wall of the measuring spindle, and the two exhaust grooves are respectively symmetrically arranged on both sides of the air nozzle.

[0009] In one embodiment, a connecting groove connecting the two exhaust grooves is provided on the outer wall of the measuring spindle.

[0010] In one embodiment, two air nozzles are spaced apart along the axial direction on the outer wall of the portion of the measuring spindle extending out of the reference platform.

[0011] In one embodiment, an auxiliary limiting block is provided on the frame, the auxiliary limiting block is located on one side of the reference platform, and the height of the auxiliary limiting block is higher than the height of the reference platform.

[0012] In one embodiment, the frame includes a plurality of support legs and a base disposed on the plurality of support legs, wherein the auxiliary limiting block and the reference platform are respectively horizontally disposed on the base.

[0013] In one embodiment, the auxiliary limiting block is disposed on the rear side of the reference platform, and anti-collision rubber blocks are disposed around the reference platform.

[0014] In one implementation, the upper surface of the reference platform is recessed to form several elongated grooves, which are distributed in parallel at intervals.

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the piston of the compressor according to an embodiment of the present utility model;

[0017] Figure 2 This is a second schematic diagram of the piston structure of the compressor according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the verticality measuring device for the groove of the compressor piston according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 An enlarged schematic diagram of part A shown;

[0020] Figure 5 This is a cross-sectional schematic diagram of the perpendicularity measuring device for the groove of the compressor piston according to an embodiment of the present invention;

[0021] Figure 6 This is a cross-sectional schematic diagram of the piston being measured by the perpendicularity measuring device of the groove of the compressor piston according to an embodiment of the present invention.

[0022] Figure 7 This is a top view of the compressor piston when the verticality measuring device for the groove of the compressor piston in this embodiment of the present invention is measuring the piston.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Frame; 11. Support feet; 12. Base; 20. Reference platform; 21. Long slot; 22. Anti-collision rubber block; 30. Measuring spindle; 31. Air inlet; 32. Airflow channel; 33. Air nozzle; 34. Exhaust channel; 40. Piston; 50. Hose; 60. Auxiliary limit block; 61. Limit sensor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0027] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In related technologies, during the development of compressors, as the energy efficiency requirements of product structures become increasingly stringent, the assembly precision of the compressor pump body components directly affects product energy efficiency. The piston is the core component used to compress gas during compressor operation. Common compressor pistons are circular structures with a central through-hole, primarily driven by a crankshaft to rotate, which in turn pushes a slider against the piston's outer periphery to perform compression. For example... Figure 1 and Figure 2 As shown, the outer peripheral wall of piston 40 has a radially recessed groove that runs through both ends of its axial direction. The groove is a cylindrical through-slot structure with a notch, with a diameter of about 3 mm. The perpendicularity accuracy requirement of the groove is high. The existing perpendicularity test of piston groove is generally carried out by directly inserting the workpiece for rough measurement. The measurement results are relatively rough and cannot meet the high precision requirements.

[0029] Therefore, this utility model provides a device for measuring the perpendicularity of the groove of a compressor piston. The device for measuring the perpendicularity of the groove of a compressor piston according to this utility model can efficiently and accurately measure the perpendicularity of the groove of the compressor piston, greatly improving detection efficiency and ensuring the quality of the compressor piston.

[0030] Please see Figures 1 to 7 This utility model embodiment provides a device for measuring the verticality of the groove of a compressor piston 40, including a frame 10, a reference platform 20, a measuring spindle 30, and a gas-electric meter. The reference platform 20 is horizontally arranged on the frame 10, and the measuring spindle 30 is vertically arranged on the reference platform 20. An airflow channel 32 is arranged axially inside the measuring spindle 30. One end of the measuring spindle 30 has an air inlet 31 that communicates with the airflow channel 32. An air nozzle 33 that communicates with the airflow channel 32 is arranged through the outer wall of the measuring spindle 30. The end of the measuring spindle 30 away from the air inlet 31 is used for the groove of the piston 40 to be inserted into it and form a clearance fit. The gas-electric meter is connected to the end of the measuring spindle 30 away from the air inlet 31 through a hose 50.

[0031] Therefore, according to the perpendicularity measuring device for the groove of the compressor piston 40 of this utility model, the perpendicularity of the groove of the piston 40 can be measured by the cooperation between the measuring spindle 30, the piston 40, the reference platform 20, and the gas-electric meter. Specifically, the groove of the piston 40 is inserted into the measuring spindle 30, and the outer wall of the measuring spindle 30 forms a clearance fit with the inner wall of the groove of the piston 40. An air supply device is connected at the air inlet 31 so that the airflow enters the airflow channel 32 of the measuring spindle 30 from the air inlet 31 and is ejected from the air nozzle 33 of the measuring spindle 30. Due to the clearance fit between the measuring spindle 30 and the groove of the piston 40, the airflow from the air nozzle 33... The airflow from the 3rd stage forms an intermittent airflow and enters the gas-electric meter through the upper end of the measuring spindle 30 and the hose 50. The pneumatic converter inside the gas-electric meter converts the airflow flow rate and pressure value into a measured value in real time and displays it on the gas-electric meter. During the measurement process, the piston 40 can be rotated so that the piston 40 slowly rotates around the measuring spindle 30 so that different areas of the groove of the piston 40 correspond to the air nozzle 33, thereby making the measurement value more accurate. In other words, the perpendicularity measuring device of the groove of the compressor piston 40 of this utility model can efficiently and accurately measure the perpendicularity of the groove of the compressor piston 40, greatly improving the detection efficiency and ensuring the quality of the compressor piston 40.

[0032] Specifically, in this embodiment of the invention, the lower end of the measuring spindle 30 penetrates the reference platform 20 and the frame 10 and is provided with an air inlet 31. The upper end of the measuring spindle 30 extends vertically upward above the reference platform 20, and the height of the measuring spindle 30 extending above the reference platform 20 is greater than the length of the groove of the piston 40. Furthermore, in this embodiment of the invention, an auxiliary limiting block 60 is provided on the frame 10. The auxiliary limiting block 60 is located on one side of the reference platform 20, and its height is higher than that of the reference platform 20. The frame 10 includes several support legs 11 and a base 12 disposed on the support legs 11. The auxiliary limiting block 60 and the reference platform 20 are horizontally disposed on the base 12. The auxiliary limiting block 60 is disposed on the rear side of the reference platform 20, and anti-collision rubber blocks 22 are provided around the reference platform 20.

[0033] Optionally, in some embodiments of this invention, an exhaust groove 34 is recessed on the outer wall of the portion of the measuring spindle 30 extending from the reference platform 20. The length direction of the exhaust groove 34 is parallel to the axial direction of the measuring spindle 30, and the lower end of the exhaust groove 34 extends through the reference platform 20, while the upper end of the exhaust groove 34 extends through the top of the measuring spindle 30. In other words, in these embodiments, by providing an exhaust groove 34 on the outer wall of the measuring spindle 30, the exhaust of the airflow can be made smoother. When the groove of the piston 40 to be tested is inserted into the measuring spindle 30, one end of the flexible hose 50 connecting the gas-electric meter is sleeved on the measuring spindle 30, and the opening of the flexible hose 50 abuts against the edge of the groove of the piston 40 to be tested for measurement.

[0034] Furthermore, in these embodiments, two exhaust grooves 34 are arranged relatively parallel on the outer wall of the measuring spindle 30. The two exhaust grooves 34 are symmetrically arranged on both sides of the air nozzle 33. A connecting groove connecting the two exhaust grooves 34 is provided on the outer wall of the measuring spindle 30. In addition, two air nozzles 33 are spaced apart along the axial direction on the outer wall of the portion of the measuring spindle 30 extending from the reference platform 20. That is to say, in these embodiments, by providing two air nozzles 33 and two axial exhaust grooves 34 on the measuring spindle 30, the exhaust of airflow can be made smoother.

[0035] Optionally, in some embodiments of the present invention, the upper surface of the reference platform 20 is recessed to form a plurality of elongated grooves 21, which are distributed in parallel at intervals.

[0036] The following is combined with Figures 1 to 7 The following is a detailed description of a specific embodiment of the perpendicularity measuring device for the groove of a compressor piston according to the present invention. It is worth understanding that the following is merely an illustrative description and should not be construed as a limitation of the present invention.

[0037] This embodiment provides a device for measuring the perpendicularity of the groove of a compressor piston 40, including a frame 10, a reference platform 20, a measuring spindle 30, and a gas-electric meter. The reference platform 20 is horizontally mounted on the frame 10, and the measuring spindle 30 is vertically mounted on the reference platform 20. An airflow channel 32 is axially arranged inside the measuring spindle 30. One end of the measuring spindle 30 has an air inlet 31 that communicates with the airflow channel 32. An air nozzle 33 that communicates with the airflow channel 32 is provided through the outer wall of the measuring spindle 30. The end of the measuring spindle 30 away from the air inlet 31 is used for the groove of the piston 40 to be inserted into and form a clearance fit. The gas-electric meter is connected to the end of the measuring spindle 30 away from the air inlet 31 via a flexible hose 50. The air supply device in this embodiment can be a conventional air supply device in the art, and the gas-electric meter can also be a conventional measuring instrument in the art, which will not be described in detail here.

[0038] Specifically, in this embodiment of the invention, the lower end of the measuring spindle 30 penetrates the reference platform 20 and the frame 10 and is provided with an air inlet 31. The upper end of the measuring spindle 30 extends vertically upward above the reference platform 20, and the height of the measuring spindle 30 extending above the reference platform 20 is greater than the length of the groove of the piston 40. Furthermore, in this embodiment of the invention, an auxiliary limiting block 60 is provided on the frame 10. The auxiliary limiting block 60 is located on one side of the reference platform 20, and its height is higher than that of the reference platform 20. The frame 10 includes several support legs 11 and a base 12 disposed on the support legs 11. The auxiliary limiting block 60 and the reference platform 20 are horizontally disposed on the base 12. The auxiliary limiting block 60 is disposed on the rear side of the reference platform 20, and anti-collision rubber blocks 22 are provided around the reference platform 20.

[0039] Therefore, according to the perpendicularity measuring device for the groove of the compressor piston 40 in this embodiment, the perpendicularity of the groove of the piston 40 can be measured by measuring the fit between the measuring spindle 30, the piston 40, the reference platform 20, and the gas-electric meter. Specifically, the groove of the piston 40 is inserted into the measuring spindle 30, and the outer wall of the measuring spindle 30 forms a clearance fit with the inner wall of the groove of the piston 40. The bottom of the piston 40 abuts against the reference platform 20. An air supply device is connected at the air inlet 31 so that the airflow enters the airflow channel 32 of the measuring spindle 30 from the air inlet 31 and is ejected from the air nozzle 33 of the measuring spindle 30. Since a clearance fit is formed between the measuring spindle 30 and the groove of the piston 40, the airflow from the air nozzle 33 forms a gap airflow and passes through the measuring spindle 30. The upper end of the measuring spindle 30 enters the gas-electric meter via a flexible hose 50. The pneumatic converter within the gas-electric meter converts the airflow and pressure values ​​into measured values ​​in real time and displays them on the meter. During measurement, the piston 40 can be rotated, causing it to slowly rotate around the measuring spindle 30 so that different areas of the piston 40's groove correspond to the air nozzle 33, thus making the measurement more accurate. Furthermore, for better comparison, when measuring the piston 40 part to be tested, a standard calibration piston 40 can be measured first in the above manner to obtain the standard value range of the calibration piston 40. Then, the piston 40 part to be tested is measured, and the measured value is compared with the standard value to determine whether the perpendicularity of the groove of the piston 40 part to be tested meets the standard requirements. In other words, the perpendicularity measuring device for the groove of the compressor piston 40 in this embodiment can efficiently and accurately measure the perpendicularity of the groove of the compressor piston 40, greatly improving detection efficiency and ensuring the quality of the compressor piston 40.

[0040] The following is combined with Figures 1 to 7 The following is a detailed description of a specific embodiment of the perpendicularity measuring device for the groove of a compressor piston according to the present invention. It is worth understanding that the following is merely an illustrative description and should not be construed as a limitation of the present invention.

[0041] This embodiment provides a device for measuring the perpendicularity of the groove of a compressor piston 40, including a frame 10, a reference platform 20, a measuring spindle 30, and a gas-electric meter. The reference platform 20 is horizontally mounted on the frame 10, and the measuring spindle 30 is vertically mounted on the reference platform 20. An airflow channel 32 is axially arranged inside the measuring spindle 30. One end of the measuring spindle 30 has an air inlet 31 that communicates with the airflow channel 32. An air nozzle 33 that communicates with the airflow channel 32 is provided through the outer wall of the measuring spindle 30. The end of the measuring spindle 30 away from the air inlet 31 is used for the groove of the piston 40 to be inserted into and form a clearance fit. The gas-electric meter is connected to the end of the measuring spindle 30 away from the air inlet 31 via a flexible hose 50. The air supply device in this embodiment can be a conventional air supply device in the art, and the gas-electric meter can also be a conventional measuring instrument in the art, which will not be described in detail here.

[0042] Specifically, in this embodiment of the invention, the lower end of the measuring spindle 30 passes through the reference platform 20 and the frame 10 and is provided with an air inlet 31. The upper end of the measuring spindle 30 extends vertically upward above the reference platform 20, and the height of the measuring spindle 30 extending above the reference platform 20 is greater than the length of the groove of the piston 40. Furthermore, in this embodiment of the invention, an auxiliary limiting block 60 is provided on the frame 10. The auxiliary limiting block 60 is located on one side of the reference platform 20, and its height is higher than that of the reference platform 20. Additionally, limit sensors 61 are symmetrically arranged relative to the measuring spindle 30 on the side of the auxiliary block 60 facing the measuring spindle 30. The two limit sensors 61 are electrically connected to the gas-electric meter, and are used to sense whether the outer wall of the piston 40 abuts against the side of the auxiliary block 60 facing the measuring spindle 30.

[0043] In this embodiment, the frame 10 includes a plurality of support legs 11 and a base 12 disposed on the plurality of support legs 11. An auxiliary limiting block 60 and a reference platform 20 are respectively horizontally disposed on the base 12; and the auxiliary limiting block 60 is disposed on the rear side of the reference platform 20, and anti-collision rubber blocks 22 are disposed around the reference platform 20. Furthermore, a plurality of elongated grooves 21 are recessed on the upper surface of the reference platform 20, and the plurality of elongated grooves 21 are distributed parallel to each other at intervals.

[0044] Furthermore, in this embodiment, an exhaust groove 34 is recessed on the outer wall of the portion of the measuring spindle 30 extending from the reference platform 20. The length direction of the exhaust groove 34 is parallel to the axial direction of the measuring spindle 30, and the lower end of the exhaust groove 34 extends through the reference platform 20, while the upper end of the exhaust groove 34 extends through the top of the measuring spindle 30. Two exhaust grooves 34 are arranged relatively parallel on the outer wall of the measuring spindle 30, and the two exhaust grooves 34 are symmetrically arranged on both sides of the air nozzle 33. A connecting groove connecting the two exhaust grooves 34 is provided on the outer wall of the measuring spindle 30. In addition, two air nozzles 33 are spaced apart along the axial direction on the outer wall of the portion of the measuring spindle 30 extending from the reference platform 20.

[0045] In specific measurements, this embodiment first measures the compliant calibration piston 40 to determine the standard value range. Specifically, the groove of the calibration piston 40 is inserted into the measuring spindle 30, with the bottom of the calibration piston 40 abutting against the reference platform 20. Then, a hose 50 connects the top of the measuring spindle 30 to the gas-electric meter, and a hose 50 also connects the air inlet 31 of the measuring spindle 30 to an external air supply device. The calibration piston 40 is rotated so that its outer side wall abuts against one of the limit sensors 61 of the auxiliary limit block 60. When the limit sensor 61 senses the calibration piston 40, it sends a start signal to the gas-electric meter. The gas-electric meter will only start working after receiving the start signal from the limit sensor 61, activating the air supply device. Airflow enters the airflow channel 32 of the measuring spindle 30 from the air inlet 31 and is ejected from the two air nozzles 33 of the measuring spindle 30. The airflow enters the flexible tube 50 at the top of the measuring spindle 30 through the gap formed by the exhaust groove 34 of the measuring spindle 30 and the groove between the measuring spindle 30 and the calibration piston 40, and finally enters the gas-electric meter. The pneumatic converter in the gas-electric meter converts the airflow flow and pressure values ​​into measured values ​​in real time and displays them on the gas-electric meter. During the measurement process, the calibration piston 40 is slowly rotated so that it slowly rotates 180° around the measuring spindle 30. After that, the outer wall of the calibration piston 40 abuts against another limit sensor 61 of the auxiliary limit block 60. The limit sensor 61 sends a stop signal to the gas-electric meter. After receiving the stop signal, the gas-electric meter stops the measurement. Thus, the measurement of the calibration piston 40 is completed and the standard value range of the calibration piston 40 is obtained. Then, the above steps are repeated for the piston to be tested 40 to measure the perpendicularity of the groove of the piston to be tested 40. The measured value is compared with the standard value range to determine whether the piston to be tested 40 meets the standard requirements. In other words, the perpendicularity measuring device of the groove of the compressor piston 40 in this embodiment can efficiently and accurately measure the perpendicularity of the groove of the compressor piston 40, greatly improving the detection efficiency and ensuring the quality of the compressor piston 40.

[0046] Among them, two limit sensors 61 are used to identify whether the piston 40 is in position and provide detection signals to the gas-electric meter so that the piston 40 can rotate 180°. By effectively identifying the start and end positions of the piston 40, the defects such as missed operation and incorrect operation of the piston 40 are prevented, and the control logic of "no measurement without parts, measurement only when parts are in position" is realized.

[0047] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the perpendicularity measuring device for the groove of the compressor piston 40 of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A device for measuring the perpendicularity of the groove of a compressor piston, characterized in that: The device includes a frame, a reference platform, a measuring spindle, and a gas-electric meter. The reference platform is horizontally mounted on the frame, and the measuring spindle is vertically mounted on the reference platform. An airflow channel is axially arranged inside the measuring spindle. One end of the measuring spindle has an air inlet that communicates with the airflow channel. An air nozzle that communicates with the airflow channel is arranged through the outer wall of the measuring spindle. The end of the measuring spindle away from the air inlet is used for a piston groove to be inserted therein to form a clearance fit. The gas-electric meter is connected to the end of the measuring spindle away from the air inlet via a flexible hose.

2. The perpendicularity measuring device for the groove of the compressor piston according to claim 1, characterized in that: The lower end of the measuring spindle passes through the reference platform and the frame and is provided with the air inlet. The upper end of the measuring spindle extends vertically upward above the reference platform, and the height of the measuring spindle extending above the reference platform is greater than the length of the groove of the piston.

3. The perpendicularity measuring device for the groove of the compressor piston according to claim 2, characterized in that: An exhaust groove is recessed on the outer wall of the portion of the measuring spindle that extends out of the reference platform. The length direction of the exhaust groove is parallel to the axial direction of the measuring spindle, and the lower end of the exhaust groove extends through the reference platform, while the upper end of the exhaust groove extends through the top of the measuring spindle.

4. The perpendicularity measuring device for the groove of the compressor piston according to claim 3, characterized in that: Two exhaust grooves are arranged relatively parallel to each other on the outer wall of the measuring spindle, and the two exhaust grooves are respectively symmetrically arranged on both sides of the air nozzle.

5. The perpendicularity measuring device for the groove of the compressor piston according to claim 4, characterized in that: The outer wall of the measuring spindle is provided with a connecting groove that connects the two exhaust grooves.

6. The perpendicularity measuring device for the groove of the compressor piston according to claim 2, characterized in that: Two air nozzles are spaced apart along the axial direction on the outer wall of the portion of the measuring spindle that extends out of the reference platform.

7. The perpendicularity measuring device for the groove of the compressor piston according to claim 1, characterized in that: An auxiliary limiting block is provided on the frame. The auxiliary limiting block is located on one side of the reference platform, and the height of the auxiliary limiting block is higher than the height of the reference platform.

8. The perpendicularity measuring device for the groove of the compressor piston according to claim 7, characterized in that: The frame includes several support legs and a base disposed on the several support legs, and the auxiliary limiting block and the reference platform are respectively horizontally disposed on the base.

9. The perpendicularity measuring device for the groove of the compressor piston according to claim 8, characterized in that: The auxiliary limiting block is located on the rear side of the reference platform, and anti-collision rubber blocks are provided around the reference platform.

10. The perpendicularity measuring device for the groove of the compressor piston according to claim 1, characterized in that: The upper surface of the reference platform is recessed to form several elongated grooves, which are distributed in parallel at intervals.

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