Shaft part inner hole measuring device

Abstract

The utility model discloses a kind of shaft parts inner hole measuring devices, it is related to inner hole measuring device technical field, including pneumatic measuring head, it is used to measure shaft parts inner hole, pneumatic measuring head can be moved in first direction, first direction is parallel with the axial line of the inner hole of the measured part, the end of the shaft part is sleeved by the connecting sleeve in the application, avoid that pneumatic measuring head cannot align part inner hole, then staff separates from measuring rod with limit bolt, at this time, measuring rod can slide in sleeve hole, ring gauge is inserted into the predetermined measurement section of part, reading head is cooperated with grating scale in the process of measuring rod sliding, the length of ring gauge inserted into inner hole is detected, and the display unit of external control mechanism is used to display the length of insertion, intuitive and explicit, solve the problem that existing handheld pneumatic measuring tool is not easy to align predetermined measurement section when detecting the inner hole of shaft part, resulting in error between final measurement result and actual value.

Description

Technical Field

[0001] This utility model relates to the technical field of internal hole measuring devices, and in particular to an internal hole measuring device for shaft parts. Background Technology

[0002] Shafts are fundamental components widely used in the mechanical manufacturing field. Their structure typically includes a shaft body and an inner bore along the shaft's axis. This inner bore is often used to facilitate the installation of the shaft with other components, and to allow for the connection of oil or air passages. The dimensional accuracy of the inner bore (such as diameter, roundness, and cylindricity) directly affects the assembly performance and operational reliability of the shaft. Therefore, accurate measurement of the inner bore dimensions is a crucial step in ensuring product quality during the manufacturing process of shafts.

[0003] Currently, existing methods for measuring the internal diameter of shaft parts include contact measurement, non-contact measurement, and automated intelligent measurement. Non-contact measurement includes optical measurement, pneumatic measurement, and ultrasonic measurement. Pneumatic measurement requires pneumatic measuring tools. When measuring shaft parts with existing handheld pneumatic measuring tools, workers need to manually control the measuring head to extend into the hole. When the measuring head is inserted into the hole, workers mostly observe the depth of the measuring head by observing the scale marks on the surface of the measuring head. However, visual observation of the scale marks is easy to misread due to their small size, resulting in inaccurate alignment with the predetermined measurement section of the internal diameter (depending on customer needs, the diameter of the internal diameter of shaft parts is not necessarily uniform; it can be conical, corrugated, continuously contracting, or enlarging, and the shape of the internal diameter detected by different measurement sections will differ). This will lead to errors between the final measurement result and the actual value, easily causing qualified parts to be misjudged as unqualified, or vice versa. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a device for measuring the inner hole of shaft parts, which solves the problem that existing handheld pneumatic measuring tools are not easy to align with the predetermined measurement section when measuring the inner hole of shaft parts, resulting in errors between the final measurement result and the actual value.

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

[0006] A device for measuring the internal hole of a shaft-type part, comprising:

[0007] A pneumatic measuring head is used to measure the inner hole of shaft parts, including measuring dimensional parameters, form tolerance parameters, and position tolerance parameters. It needs to be used in conjunction with an external control mechanism. The control mechanism is existing technology and includes an air source processing unit, a pneumatic sensor, a signal processing and display unit, and control and adjustment components. The pneumatic measuring head can move in a first direction, which is parallel to the axis of the inner hole of the measured part. The first direction is F1, and the movement in the first direction includes forward and backward movement.

[0008] The mounting mechanism is used to mount the pneumatic measuring head. When the pneumatic measuring head moves in a first direction, the mounting mechanism can detect the moving distance of the pneumatic measuring head. The mounting mechanism includes a limit bolt, which is in contact with the pneumatic measuring head and is used to fix the position of the pneumatic measuring head.

[0009] The connecting mechanism includes a connecting sleeve, which is annular and made of stainless steel. Two protrusions are distributed on the inner wall of the connecting sleeve. The protrusions are integrally formed with the connecting sleeve. The connecting sleeve is used to fit the end of the shaft part, and the mounting mechanism is simply fixed on the shaft part (the worker needs to hold the pneumatic measuring head with one hand). The connecting sleeve can be machined into any hole diameter as needed at the factory to adapt to shaft parts of different sizes.

[0010] Preferably, the pneumatic measuring head includes a measuring rod, one end of which is fixedly connected to an air tube by an adhesive. A baffle is fixedly installed at the end of the measuring rod near the air tube to prevent the pneumatic measuring head from detaching from the mounting mechanism. A threaded joint is fixedly installed at the end of the measuring rod away from the air tube in an integral forming manner. The measuring rod and the threaded joint are tubular structures made of stainless steel and have through holes for compressed gas to flow through.

[0011] Preferably, the pneumatic measuring head also includes a ring gauge. The ring gauge has a threaded interface on the side near the measuring rod. The ring gauge is threadedly connected to the threaded connector through the threaded interface. The ring gauge is a steel structure made of stainless steel. It has a through hole for compressed air to flow through, so that the compressed air can be introduced into the inner hole of the shaft part to achieve the effect of detecting the inner hole of the shaft part.

[0012] Preferably, the side wall of the measuring rod is fixedly provided with a limit slide rail by integral molding, and a groove is provided on the side of the measuring rod away from the limit slide rail. A grating scale is fixedly provided on the inner side of the groove by adhesive.

[0013] Preferably, the installation mechanism includes a support member, which is a U-shaped structure made of stainless steel. A sleeve hole is provided at the symmetrical center of the support member, and a limiting groove is also provided on the surface of the sleeve hole.

[0014] Preferably, the sleeve hole and the measuring rod are slidably connected, the limiting slide groove and the limiting slide rail are slidably connected, the pneumatic measuring head can move within the sleeve hole, and the limiting slide rail cooperates with the limiting slide groove to prevent the pneumatic measuring head from rotating.

[0015] Preferably, a reading head is fixedly connected to the top surface of the support member by screws. The reading head is adapted to the grating scale in the groove. The reading head is electrically connected to the control mechanism of the external device through a flexible circuit. Mounting holes are opened at both ends of the support member.

[0016] Preferably, an L-shaped plate is fixedly connected to the side wall of the support member by welding. A nut is fixedly installed on the surface of the L-shaped plate by welding. The nut is threadedly connected to a limit bolt. A handwheel is fixedly connected to one end of the limit bolt by welding, and a rubber pad is provided at the other end. The rubber pad is pressed and connected to the measuring rod to fix the measuring rod. The limit bolt can be controlled to rotate on the nut by the handwheel, which will cause the rubber pad to be pressed or separated from the measuring rod.

[0017] Preferably, both ends of the connecting sleeve are fixedly connected to connecting blocks by welding, and the bottom surfaces of the two connecting blocks are fixedly connected to fixing bolts by welding.

[0018] Preferably, the two fixing bolts are respectively fitted into the two mounting holes, and the ends of the two fixing bolts that pass through the mounting holes are threaded with nuts.

[0019] This application uses a connecting sleeve to connect with the end of a shaft-like part, preventing the pneumatic measuring head from being misaligned with the inner hole of the part. The operator then separates the limiting bolt from the measuring rod, allowing the measuring rod to slide within the sleeve hole. This allows the ring gauge to be inserted into the predetermined measurement section of the part. During the sliding of the measuring rod, the reading head cooperates with the grating scale to detect the length of the ring gauge inserted into the inner hole. The insertion length is displayed intuitively and clearly through the display unit of the external control mechanism. This solves the problem that existing handheld pneumatic measuring tools are difficult to align with the predetermined measurement section when measuring the inner hole of shaft-like parts, leading to errors between the final measurement result and the actual value. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a structural diagram of the pneumatic measuring head and mounting mechanism of this utility model in a separated state;

[0023] Figure 3This is a structural diagram of the pneumatic measuring head of this utility model;

[0024] Figure 4 This is a structural diagram of the installation mechanism and the connection mechanism of this utility model in their separated states.

[0025] Legend: 100, Pneumatic measuring head; 101, Measuring rod; 102, Air tube; 103, Baffle; 104, Limiting slide rail; 105, Groove; 106, Threaded joint; 107, Ring gauge; 108, Threaded interface; 200, Mounting mechanism; 201, Support; 202, Sleeve hole; 203, Limiting slide groove; 204, Reading head; 205, Mounting hole; 206, L-shaped plate; 207, Limiting bolt; 300, Connecting mechanism; 301, Connecting sleeve; 302, Connecting block; 303, Fixing bolt. Detailed Implementation

[0026] This application provides a device for measuring the inner hole of shaft parts, which effectively solves the problem that existing handheld pneumatic measuring tools are not easy to align with the predetermined measurement section when measuring the inner hole of shaft parts, resulting in errors between the final measurement result and the actual value.

[0027] Example 1

[0028] When a handheld pneumatic measuring head is inserted into a hole, workers usually observe the depth of the measuring head by looking at the scale markings on the surface of the measuring head. However, visual observation of the scale is prone to errors due to the small size of the markings, which can lead to misalignment with the intended measurement section of the inner hole. This can result in errors between the final measurement result and the actual value, and may cause qualified parts to be misjudged as unqualified or vice versa.

[0029] To address the problems existing in the prior art, this utility model provides a device for measuring the inner hole of shaft parts;

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the internal hole measuring device for shaft parts includes a pneumatic measuring head 100, a mounting mechanism 200, and a connecting mechanism 300. The pneumatic measuring head 100 is used to measure the internal hole of the shaft part. The pneumatic measuring head 100 can move in a first direction, which is parallel to the axis of the internal hole of the part being measured. The mounting mechanism 200 is used to mount the pneumatic measuring head 100. When the pneumatic measuring head 100 moves in the first direction, the mounting mechanism 200 can detect the moving distance of the pneumatic measuring head 100. The mounting mechanism 200 includes a limiting bolt 207, which is in pressing contact with the pneumatic measuring head 100. The connecting mechanism 300 includes a connecting sleeve 301, which is annular in shape. Two protrusions are distributed on the inner wall of the connecting sleeve 301.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the pneumatic measuring head 100 is used to measure the inner hole of shaft-type parts, including measuring dimensional parameters, form tolerance parameters, and position tolerance parameters. It needs to be used in conjunction with an external control mechanism, which is existing technology. This control mechanism includes an air source processing unit, a pneumatic sensor, a signal processing and display unit, and control and adjustment components. The pneumatic measuring head 100 can move in a first direction, which is parallel to the axis of the inner hole of the measured part. Figure 4 As shown, the first direction is F1, and movement in the first direction includes moving forward and backward;

[0032] like Figure 2 and Figure 4 As shown, the mounting mechanism 200 is used to mount the pneumatic measuring head 100. When the pneumatic measuring head 100 moves in a first direction, the mounting mechanism 200 can detect the moving distance of the pneumatic measuring head 100. The mounting mechanism 200 includes a limiting bolt 207, which is in pressing contact with the pneumatic measuring head 100. The limiting bolt 207 is used to fix the position of the pneumatic measuring head 100.

[0033] like Figure 2 and Figure 4 As shown, the connecting mechanism 300 includes a connecting sleeve 301, which is annular and made of stainless steel. Two protrusions are distributed on the inner wall of the connecting sleeve 301. The protrusions are integrally formed with the connecting sleeve 301. The connecting sleeve 301 is used to fit the end of the shaft part, so that the mounting mechanism 200 can be simply fixed on the shaft part (the worker needs to hold the pneumatic measuring head 100 with one hand). The connecting sleeve 301 can be machined into any hole diameter as needed at the factory to adapt to shaft parts of different sizes.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the pneumatic measuring head 100 includes a measuring rod 101. One end of the measuring rod 101 is fixedly connected to an air tube 102 by adhesive. A baffle 103 is fixedly provided at the end of the measuring rod 101 near the air tube 102. The baffle 103 is used to prevent the pneumatic measuring head 100 from detaching from the mounting mechanism 200. A threaded connector 106 is fixedly provided at the end of the measuring rod 101 away from the air tube 102 by integral forming. The measuring rod 101 and the threaded connector 106 are tubular structures made of stainless steel, and have through holes for compressed gas to flow through.

[0035] like Figure 1 , Figure 2 and Figure 3As shown, the pneumatic measuring head 100 also includes a ring gauge 107. The ring gauge 107 has a threaded interface 108 on the side near the measuring rod 101. The ring gauge 107 is threadedly connected to the threaded connector 106 through the threaded interface 108. The ring gauge 107 is a steel structure made of stainless steel. It has a through hole for compressed air to flow through, so that the compressed air can be introduced into the inner hole of the shaft part to achieve the effect of detecting the inner hole of the shaft part.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the side wall of the measuring rod 101 is fixedly provided with a limiting slide rail 104 by integral molding. A groove 105 is provided on the side of the measuring rod 101 away from the limiting slide rail 104. A grating scale is fixedly provided on the inner side of the groove 105 by adhesive.

[0037] like Figure 2 and Figure 4 As shown, the installation mechanism 200 includes a support member 201, which is a U-shaped structure made of stainless steel. A sleeve hole 202 is provided at the symmetrical center position of the support member 201, and a limiting groove 203 is also provided on the surface of the sleeve hole 202.

[0038] like Figure 2 and Figure 4 As shown, the sleeve hole 202 is slidably connected to the measuring rod 101, and the limiting slide groove 203 is slidably connected to the limiting slide rail 104. The pneumatic measuring head 100 can move within the sleeve hole 202, and the limiting slide rail 104 cooperates with the limiting slide groove 203 to prevent the pneumatic measuring head 100 from rotating.

[0039] like Figure 2 and Figure 4 As shown, a reading head 204 is fixedly connected to the top surface of the support member 201 by screws. The reading head 204 is adapted to the grating scale in the groove 105. The reading head 204 is electrically connected to the control mechanism of the external device through a flexible circuit. Mounting holes 205 are provided at both ends of the support member 201.

[0040] like Figure 2 and Figure 4 As shown, an L-shaped plate 206 is fixedly connected to the side wall of the support member 201 by welding. A nut is fixedly installed on the surface of the L-shaped plate 206 by welding. The nut is threadedly connected to the limiting bolt 207. A handwheel is fixedly connected to one end of the limiting bolt 207 by welding, and a rubber pad is provided at the other end. The rubber pad is pressed and connected to the measuring rod 101 to fix the measuring rod 101. The limiting bolt 207 can be rotated on the nut by the handwheel, which will cause the rubber pad to be pressed or separated from the measuring rod 101.

[0041] like Figure 2 and Figure 4As shown, both ends of the connecting sleeve 301 are fixedly connected to the connecting block 302 by welding, and the bottom surfaces of the two connecting blocks 302 are fixedly connected to the fixing bolt 303 by welding.

[0042] like Figure 2 and Figure 4 As shown, the two fixing bolts 303 are respectively fitted into the two mounting holes 205, and the ends of the two fixing bolts 303 that pass through the mounting holes 205 are threaded with nuts.

[0043] This application uses a pneumatic measuring head 100 to measure the inner hole of shaft-like parts. First, the connecting sleeve 301 is fitted onto the end of the shaft-like part to prevent the pneumatic measuring head 100 from misaligning with the inner hole. Then, the operator separates the limiting bolt 207 from the measuring rod 101. At this point, the measuring rod 101 can slide within the sleeve hole 202. The ring gauge 107 is then inserted into the predetermined measurement section of the part. During the sliding of the measuring rod 101, the reading head 204 cooperates with the grating scale to detect the length of the ring gauge 107 inserted into the inner hole (the distance between the connecting sleeve 301 and the ring gauge 107 is fixed; only the value detected by the reading head 204 needs to be subtracted). The distance between the connecting sleeve 301 and the ring gauge 107 can be used to obtain the length of the ring gauge 107 extending into the inner hole of the part. The extension length is displayed by the display unit of the external control mechanism, which is intuitive and clear. After the ring gauge 107 reaches the predetermined measurement section, the limit bolt 207 is tightened to squeeze the measuring rod 101 and fix the measuring rod 101 to prevent the measuring rod 101 from slipping. At this time, the inner hole of the shaft part can be detected. The detection method of this application is the same as that of the prior art. It utilizes the flow characteristics of compressed air and indirectly reflects the size of the gap between the inner hole and the probe by measuring the pressure or flow rate change of the airflow, and then calculates the actual size deviation of the inner hole.

[0044] 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. A device for measuring the inner hole of shaft-type parts, characterized in that, include; A pneumatic measuring head (100) is used to measure the inner hole of a shaft-type part. The pneumatic measuring head (100) is movable in a first direction, which is parallel to the axis of the inner hole of the part being measured. Mounting mechanism (200) for mounting pneumatic measuring head (100), which can detect the moving distance of pneumatic measuring head (100) when the pneumatic measuring head (100) moves in a first direction, the mounting mechanism (200) includes a limiting bolt (207) that is in compressive contact with the pneumatic measuring head (100); The connecting mechanism (300) includes a connecting sleeve (301) which is annular and has two protrusions distributed on its inner wall.

2. The device for measuring the inner hole of a shaft-type part as described in claim 1, characterized in that: The pneumatic measuring head (100) includes a measuring rod (101), one end of which is fixedly connected to an air tube (102). A baffle (103) is fixedly provided at the end of the measuring rod (101) near the air tube (102), and a threaded joint (106) is fixedly provided at the end of the measuring rod (101) away from the air tube (102).

3. The device for measuring the inner hole of a shaft-type part as described in claim 2, characterized in that: The pneumatic measuring head (100) also includes a ring gauge (107), which has a threaded interface (108) on the side near the measuring rod (101). The ring gauge (107) is threadedly connected to the threaded connector (106) through the threaded interface (108).

4. The device for measuring the inner hole of a shaft-type part as described in claim 3, characterized in that: The measuring rod (101) has a limiting slide rail (104) fixedly installed on its side wall. A groove (105) is provided on the side of the measuring rod (101) away from the limiting slide rail (104). A grating scale is fixedly installed on the inner side of the groove (105).

5. The device for measuring the inner hole of a shaft-type part as described in claim 4, characterized in that: The installation mechanism (200) includes a support member (201), and a sleeve hole (202) is provided at the symmetrical center position of the support member (201). A limit groove (203) is also provided on the surface of the sleeve hole (202).

6. The device for measuring the inner hole of a shaft-type part as described in claim 5, characterized in that: The sleeve hole (202) is slidably sleeved with the measuring rod (101), and the limiting slide groove (203) is slidably connected with the limiting slide rail (104).

7. The device for measuring the inner hole of a shaft-type part as described in claim 6, characterized in that: The top surface of the support member (201) is fixedly connected to a reading head (204), which is adapted to the grating scale in the groove (105). Both ends of the support member (201) are provided with mounting holes (205).

8. The device for measuring the inner hole of a shaft-type part as described in claim 7, characterized in that: The side wall of the support member (201) is fixedly connected to an L-shaped plate (206), and a nut is fixedly installed on the surface of the L-shaped plate (206). The nut is threadedly connected to a limiting bolt (207). A handwheel is fixedly connected to one end of the limiting bolt (207), and a rubber pad is provided at the other end.

9. The device for measuring the inner hole of a shaft-type part as described in claim 8, characterized in that: Both ends of the connecting sleeve (301) are fixedly connected to connecting blocks (302), and the bottom surfaces of the two connecting blocks (302) are fixedly connected to fixing bolts (303).

10. The device for measuring the inner hole of a shaft-type part as described in claim 9, characterized in that: The two fixing bolts (303) are respectively fitted into the two mounting holes (205), and the ends of the two fixing bolts (303) that pass through the mounting holes (205) are threaded with nuts.

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