A pneumatic probe for measuring the diameter of blind holes.

Abstract

This utility model discloses a pneumatic probe for measuring the diameter of a blind hole, relating to the field of pneumatic probe technology. It includes an air guiding mechanism comprising a driving component and a guiding component. The guiding component is movable in a first direction perpendicular to the ground. The length of the guiding component can be changed. The driving component can drive the guiding component to move in the first direction. By setting the air guiding mechanism, when the ring gauge is inserted into the blind hole for detection, the guiding component can be controlled to slide out of the through hole, placing it in the gap between the ring gauge and the bottom surface of the blind hole. The guiding component ensures that the gap between the ring gauge and the bottom surface of the blind hole is no longer an open plane or curved surface. The guiding component can cut the compressed air, hindering its rapid impact flow and preventing it from forming a vortex-like turbulence within the blind hole, thus avoiding measurement errors caused by turbulence.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic probe technology, and in particular to a pneumatic probe for measuring the diameter of blind holes. Background Technology

[0002] Blind hole components are widely used in fields such as machinery manufacturing, automotive parts processing, and aerospace, such as oil passages in engine blocks and mounting holes in gearbox housings. The dimensional accuracy of blind holes directly affects the assembly performance, sealing performance, and service life of components; therefore, accurate measurement of blind hole diameters is one of the key aspects of ensuring product quality.

[0003] Currently, the methods for measuring the diameter of blind holes mainly include mechanical contact measurement and non-contact measurement. Non-contact measurement includes pneumatic measurement, which requires the use of pneumatic measuring instruments. When measuring with pneumatic measuring instruments, the probe needs to be inserted into the blind hole, and the hole diameter is calculated by detecting changes in air pressure or flow rate. However, when existing pneumatic measuring instruments are used to measure blind holes, because the bottom of the blind hole is a closed structure, the airflow ejected by the probe is prone to forming eddies or airflow congestion inside the blind hole, resulting in unstable pressure signals, producing large measurement errors, and affecting measurement accuracy. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a pneumatic probe for measuring the diameter of blind holes. This solves the problem that when existing pneumatic measuring instruments are used to measure blind holes, the airflow ejected by the probe easily forms eddies or airflow congestion within the blind hole, leading to unstable pressure signals, large measurement errors, and affecting measurement accuracy.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pneumatic probe for measuring the diameter of a blind hole, comprising:

[0007] An air guiding mechanism includes a driving component and a guiding component. The guiding component is movable in a first direction, which is perpendicular to the ground. The movement in the first direction includes forward and backward movement. The first direction is F1. The length of the guiding component can be changed. The driving component can drive the guiding component to move in the first direction.

[0008] The measuring mechanism is used to measure the diameter of blind holes in a workpiece. The measuring mechanism needs to be used in conjunction with an external control mechanism. The control mechanism includes a display unit, a control unit, an electrical control unit, an air source mechanism, and a detection mechanism. The control mechanism is existing technology and includes a ring gauge. The ring gauge is annular and made of stainless steel. The ring gauge has a hollow cavity inside. The hollow cavity is annular and has several through holes at its end. A guide component is located inside the hollow cavity and is axially slidably sleeved with the through holes.

[0009] Preferably, the measuring mechanism includes a connecting rod, which is in the shape of a round tube and is made entirely of stainless steel. The connecting rod is used to connect with the external air duct and is held by the operator to insert the ring gauge into the blind hole. One end of the connecting rod has a threaded interface.

[0010] Preferably, the end of the ring gauge near the connecting rod is provided with a threaded joint in an integral forming manner. The threaded joint is threadedly connected to the threaded interface. The threaded joint and the threaded interface connect the connecting rod and the ring gauge. The inner holes of the ring gauge and the connecting rod are interconnected for the circulation of compressed air.

[0011] Preferably, the ring gauge has two circular holes at the end near the connecting rod, and both circular holes are connected to the hollow cavity.

[0012] Preferably, the drive assembly includes two electric telescopic rods, which are fixedly connected to the end of the ring gauge near the connecting rod by a bolt and nut structure. The output ends of the two electric telescopic rods are slidably sleeved with two circular holes respectively. The electric telescopic rods extend into the inner side of the hollow cavity through the circular holes, controlling the connecting ring to move within the hollow cavity, thereby driving the guide assembly to move in the first direction.

[0013] Preferably, the output ends of the two electric telescopic rods are both fixedly connected to a connecting ring by adhesive. The connecting ring is circular, made of stainless steel, and located inside the hollow cavity.

[0014] Preferably, the outer circumferential surface of the connecting ring is slidably connected to the inner wall of the ring gauge, and the connecting ring is restricted by the inner wall of the ring gauge and will not tilt, thus cooperating to guide the guiding component.

[0015] Preferably, the guide assembly includes a sleeve rod and a movable rod, one end of which has a blind hole, and the movable rod is slidably sleeved in the blind hole.

[0016] Preferably, a spring is placed inside the sleeve rod, one end of which is in contact with the end of the movable rod located in the blind hole. Four limiting grooves are provided on the inner wall of the sleeve rod, and four limiting sliders are distributed on the end of the movable rod near the sleeve rod. The limiting grooves and limiting sliders guide the movable rod.

[0017] Preferably, the movable rod is fixedly connected to the connecting ring by welding, and the sleeve rod is slidably sleeved with the through hole. When the ring gauge is inserted into the blind hole to detect the blind hole, the guide component can be controlled to slide out from the through hole, so that the guide component is located in the gap between the ring gauge and the bottom surface of the blind hole. Because the bottom of the blind hole is a closed structure, the compressed air ejected by the ring gauge is prone to forming vortices or airflow congestion in the blind hole. The setting of the guide component makes the gap between the ring gauge and the bottom surface of the blind hole no longer an open plane or curved surface. The guide component can play the role of hindering the rapid impact flow of compressed air, thereby preventing the compressed air from forming vortices in the gap.

[0018] This application, by setting up an air guiding mechanism, allows the guiding component to slide out from the through hole when the ring gauge is inserted into the blind hole for inspection. The guiding component is positioned within the gap between the ring gauge and the bottom surface of the blind hole. Because the bottom of the blind hole is a closed structure, the compressed air ejected by the ring gauge easily forms vortices or airflow congestion within the blind hole. The guiding component ensures that the gap between the ring gauge and the bottom surface of the blind hole is no longer an open plane or curved surface. The guiding component can cut through the compressed air, hindering its rapid impact and preventing the formation of vortex-like turbulence within the blind hole. This avoids measurement errors caused by turbulence and solves the problem that existing pneumatic measuring instruments, when used for blind hole measurement, easily form vortices or airflow congestion within the blind hole, leading to unstable pressure signals, large measurement errors, and affecting measurement accuracy. Attached Figure Description

[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a bottom view of the structure of this utility model;

[0022] Figure 3 This is a structural diagram of the ring gauge and the electric telescopic rod in the separated state of this utility model;

[0023] Figure 4 This is a half-sectional structural diagram of the electric telescopic rod of this utility model;

[0024] Figure 5 This is a structural diagram of the air guiding mechanism of this utility model;

[0025] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A.

[0026] Legend: 100, Measuring mechanism; 101, Connecting rod; 102, Threaded interface; 103, Ring gauge; 104, Threaded joint; 105, Hollow cavity; 106, Through hole; 107, Circular hole; 200, Air guiding mechanism; 210, Drive assembly; 211, Electric telescopic rod; 212, Connecting ring; 220, Guide assembly; 221, Sleeve rod; 222, Spring; 223, Movable rod. Detailed Implementation

[0027] This application provides a pneumatic probe for measuring the diameter of blind holes, which effectively solves the problem that when existing pneumatic measuring instruments are used to measure blind holes, the airflow ejected by the probe easily forms eddies or airflow congestion in the blind hole, resulting in unstable pressure signals, large measurement errors, and affecting measurement accuracy.

[0028] Example 1

[0029] When existing pneumatic measuring instruments are used for measuring blind holes, the bottom of the blind hole is a closed structure. The airflow ejected by the probe is prone to forming eddies or airflow blockage inside the blind hole, which leads to unstable pressure signals, resulting in large measurement errors and affecting measurement accuracy.

[0030] To address the problems existing in the prior art, this utility model provides a pneumatic probe for measuring the diameter of blind holes;

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the pneumatic probe for measuring the diameter of a blind hole includes a measuring mechanism 100 and an air guiding mechanism 200. The air guiding mechanism 200 includes a driving component 210 and a guiding component 220. The guiding component 220 is movable in a first direction. The movement of the guiding component 220 in the first direction allows it to retract inside the hollow cavity 105, or extend out of the hollow cavity 105 through the through hole 106. The first direction is perpendicular to the ground. The length of the guiding component 220 can be changed. The guiding component 220 can retract when compressed, and its length changes during retraction. This change occurs passively when subjected to compression. The drive assembly 210 can drive the guide assembly 220 to move in the first direction. The measuring mechanism 100 is used to measure the diameter of the blind hole of the workpiece. It includes a ring gauge 103, which has a hollow cavity 105 inside. The hollow cavity 105 is annular. A through hole 106 is provided at the end of the ring gauge 103. The guide assembly 220 is located inside the hollow cavity 105. The guide assembly 220 is slidably sleeved with the through hole 106. The through hole 106 allows the guide assembly 220 to move out from the inside of the hollow cavity 105.

[0032] like Figure 4 , Figure 5and Figure 6 As shown, the pneumatic probe for measuring the diameter of a blind hole includes an air guiding mechanism 200, which includes a drive component 210 and a guide component 220. The guide component 220 is movable in a first direction, which is perpendicular to the ground. The movement in the first direction includes forward and backward movement, and the first direction is F1. The length of the guide component 220 can be changed. The drive component 210 can drive the guide component 220 to move in the first direction.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, the pneumatic probe for measuring the diameter of blind holes includes a measuring mechanism 100, which is used to measure the diameter of blind holes in workpieces. The measuring mechanism 100 needs to be used in conjunction with an external control mechanism. The control mechanism includes a display unit, a control unit, an electrical control unit, an air source mechanism, and a detection mechanism. The control mechanism is existing technology and includes a ring gauge 103. The ring gauge 103 is annular and made of stainless steel. A hollow cavity 105 is opened inside the ring gauge 103. The hollow cavity 105 is annular. Several through holes 106 are opened at the end of the ring gauge 103. A guide component 220 is located inside the hollow cavity 105 and is axially slidably sleeved with the through holes 106.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the measuring mechanism 100 includes a connecting rod 101, which is in the shape of a round tube and is made of stainless steel. The connecting rod 101 is used to connect with the external air duct. It is used by the operator to hold the ring gauge 103 and insert it into the blind hole. One end of the connecting rod 101 is provided with a threaded interface 102.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the end of the ring gauge 103 near the connecting rod 101 is integrally formed with a threaded connector 104. The threaded connector 104 is threadedly connected to the threaded interface 102. The threaded connector 104 and the threaded interface 102 connect the connecting rod 101 and the ring gauge 103. The inner hole of the ring gauge 103 and the connecting rod 101 are interconnected for compressed air circulation.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the ring gauge 103 has two circular holes 107 at one end near the connecting rod 101, and both circular holes 107 are connected to the hollow cavity 105.

[0037] like Figure 4 , Figure 5 and Figure 6As shown, the drive assembly 210 includes two electric telescopic rods 211. The two electric telescopic rods 211 are fixedly connected to the end of the ring gauge 103 near the connecting rod 101 by a bolt and nut structure. The output ends of the two electric telescopic rods 211 are slidably sleeved with two circular holes 107 respectively. The electric telescopic rods 211 extend into the hollow cavity 105 through the circular holes 107, controlling the connecting ring 212 to move within the hollow cavity 105, thereby driving the guide assembly 220 to move in the first direction.

[0038] like Figure 4 , Figure 5 and Figure 6 As shown, the output ends of the two electric telescopic rods 211 are both fixedly connected to a connecting ring 212 by adhesive. The connecting ring 212 is circular and made of stainless steel. The connecting ring 212 is located inside the hollow cavity 105.

[0039] like Figure 4 , Figure 5 and Figure 6 As shown, the outer circumferential surface of the connecting ring 212 is slidably connected to the inner wall of the ring gauge 103. The connecting ring 212 is restricted by the inner wall of the ring gauge 103 and will not tilt. The two work together to guide the guide component 220.

[0040] like Figure 5 and Figure 6 As shown, the guide assembly 220 includes a sleeve rod 221 and a movable rod 223. One end of the sleeve rod 221 has a blind hole, and the movable rod 223 is slidably sleeved in the blind hole.

[0041] like Figure 5 and Figure 6 As shown, a spring 222 is placed inside the sleeve rod 221. One end of the spring 222 is in contact with the end of the movable rod 223 located in the blind hole. Four limiting grooves are provided on the inner wall of the sleeve rod 221. Four limiting sliders are distributed on the end of the movable rod 223 near the sleeve rod 221. The limiting grooves and limiting sliders guide the movable rod 223. Both the sleeve rod 221 and the movable rod 223 are made of stainless steel. The sleeve rod 221 is in the shape of a round tube, one end of which is solid and the other end is open. The movable rod 223 is in the shape of a rod.

[0042] like Figure 2 , Figure 5 and Figure 6As shown, the movable rod 223 is fixedly connected to the connecting ring 212 by welding, and the sleeve rod 221 is slidably sleeved with the through hole 106. When the ring gauge 103 is inserted into the blind hole to detect the blind hole, the guide component 220 can be controlled to slide out from the through hole 106, so that the guide component 220 is located in the gap between the ring gauge 103 and the bottom surface of the blind hole. Because the bottom of the blind hole is a closed structure, the compressed air ejected by the probe is prone to form vortices or airflow congestion in the blind hole. The setting of the guide component 220 makes the gap between the ring gauge 103 and the bottom surface of the blind hole no longer an open plane or curved surface. The guide component 220 can play the role of hindering the rapid impact flow of compressed air, thereby preventing the compressed air from forming vortices in the gap.

[0043] This application, by setting up an air guiding mechanism 200, allows the guide component 220 to slide out of the through hole 106 via an electric telescopic rod 211 when the ring gauge 103 is inserted into the blind hole for testing. This allows the guide component 220 to be positioned in the gap between the ring gauge 103 and the bottom surface of the blind hole. Because the bottom of the blind hole is a closed structure, the compressed air ejected by the ring gauge 103 is prone to forming vortices or airflow congestion in the blind hole. The guide component 220 ensures that the gap between the ring gauge 103 and the bottom surface of the blind hole is no longer an open plane or curved surface. The guide component 220 can cut the compressed air, thus hindering the rapid impact flow of the compressed air and preventing the compressed air from forming vortex-like turbulence in the blind hole, thereby avoiding measurement errors caused by turbulence.

[0044] In actual production, the bottom surface of the blind hole is not completely flat; it can be conical, flat, or hemispherical. The compressed gas ejected from the ring gauge 103 will form turbulence on the conical or hemispherical surface. The guide component 220 of this application can change its length to adapt to the curved surface. Under the push of the connecting ring 212, the guide component 220 is squeezed from the through hole 106 toward the bottom surface of the blind hole. The guide component 220 located at the edge will contact the blind hole first. Under the compression of the connecting ring 212 and the bottom surface of the blind hole, the guide component 220 will contract. The guide component 220 located on the inner side will be squeezed by the connecting ring. 212 continues to push and presses against different positions on the bottom surface of the blind hole. The gap between the bottom surface of the blind hole and the ring gauge 103 is blocked by the guide component 220 through its own deformation, which hinders the flow of compressed air. The telescopic guide component 220 allows this application to be adapted to blind holes with different bottom surfaces, making this application highly applicable (in actual production, the diameter of the blind hole may vary as needed, and different sizes of ring gauge 103 and air guiding mechanism 200 can be produced at the factory, and different ring gauge 103 and guide component 220 can be replaced according to the size of the blind hole).

[0045] The above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An air-actuated probe for measuring the bore diameter of a blind hole, characterized in that, include; The air guiding mechanism (200) includes a drive component (210) and a guide component (220), the guide component (220) being movable in a first direction perpendicular to the ground, the length of the guide component (220) being changeable, and the drive component (210) being able to drive the guide component (220) to move in the first direction; A measuring mechanism (100) for measuring the diameter of a blind hole in a workpiece includes a ring gauge (103) with a hollow cavity (105) inside the ring gauge (103). The hollow cavity (105) is annular, and a through hole (106) is provided at the end of the ring gauge (103). A guide assembly (220) is located inside the hollow cavity (105) and is slidably sleeved with the through hole (106).

2. An air prober for measuring the diameter of a blind hole as claimed in claim 1, characterized in that: The measuring mechanism (100) includes a connecting rod (101), one end of which is provided with a threaded interface (102).

3. A pneumatic probe for measuring the diameter of a blind hole as described in claim 2, characterized in that: The ring gauge (103) has a threaded connector (104) integrally formed at one end near the connecting rod (101), and the threaded connector (104) is threadedly connected to the threaded interface (102).

4. A pneumatic probe for measuring the diameter of a blind hole as described in claim 3, characterized in that: The ring gauge (103) has two circular holes (107) at one end near the connecting rod (101), and both circular holes (107) are connected to the hollow cavity (105).

5. A pneumatic probe for measuring the diameter of a blind hole as described in claim 4, characterized in that: The drive assembly (210) includes two electric telescopic rods (211), which are fixedly connected to one end of the ring gauge (103) near the connecting rod (101). The output ends of the two electric telescopic rods (211) are slidably sleeved with two circular holes (107).

6. A pneumatic probe for measuring the diameter of a blind hole as described in claim 5, characterized in that: The output ends of the two electric telescopic rods (211) are all fixedly connected to a connecting ring (212), which is circular and located inside the hollow cavity (105).

7. A pneumatic probe for measuring the diameter of a blind hole as described in claim 6, characterized in that: The outer circumferential surface of the connecting ring (212) is slidably connected to the inner wall of the ring gauge (103).

8. A pneumatic probe for measuring the diameter of a blind hole as described in claim 7, characterized in that: The guide assembly (220) includes a sleeve rod (221) and a movable rod (223). One end of the sleeve rod (221) is provided with a blind hole, and the movable rod (223) is slidably sleeved in the blind hole.

9. A pneumatic probe for measuring the diameter of a blind hole as described in claim 8, characterized in that: A spring (222) is placed inside the sleeve rod (221). One end of the spring (222) is in contact with the end of the movable rod (223) located in the blind hole. Four limiting grooves are provided on the inner wall of the sleeve rod (221). Four limiting sliders are distributed on the end of the movable rod (223) near the sleeve rod (221).

10. A pneumatic probe for measuring the diameter of a blind hole as described in claim 9, characterized in that: The movable rod (223) is fixedly connected to the connecting ring (212), and the sleeve rod (221) is slidably sleeved with the through hole (106).

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