Depth detection tool and detection method for open hole spiral groove

Abstract

The invention aims to overcome the defects in the prior art, and provides the depth detection tool and the detection method for the open hole spiral groove, which are accurate and reliable in positioning, convenient to adjust and simple and safe to operate. The positioning part of the base handle is inserted into the workpiece positioning hole, and the base handle is rotated and moved, so that the measuring ball head of the measuring pin falls into the spiral groove to be measured; checking whether the measuring plane of the measuring pin is positioned between the D surface and the X surface of the positioning cover plate by using a knife edge ruler or a tactile method, if the measuring plane is positioned between the D surface and the X surface, determining that the measuring plane is qualified, otherwise, determining that the measuring plane is unqualified; rotating and axially moving the base handle to enable the measuring ball head to be in contact with the rest part of the spiral groove, and repeating the steps; the base handle is rotated and axially moved to enable the measuring ball head to be close to the edge of the spiral groove, the base handle continues to be moved to enable the edge of the spiral groove to press the measuring ball head, the measuring pin is lifted, finally, the measuring pin is separated from the spiral groove, and workpiece measurement is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of inspection tools, and particularly to a depth inspection tool and inspection method for an open-hole spiral groove. Background Art

[0002] In the prior art, the spiral groove on the inner wall of the open hole is manually measured by a coordinate measuring machine. The main problems with using this method are as follows:

[0003] a. Limited by the structure and size, the coordinate inspection operation is complicated and time-consuming, and it is impossible to quickly and accurately judge whether the size is qualified, so it is not suitable for mass production.

[0004] b. The coordinate inspection cannot detect all points of the spiral groove and cannot truly reflect the actual assembly and use conditions. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a depth inspection tool and inspection method for an open-hole spiral groove, which has accurate and reliable positioning, convenient adjustment, and simple and safe operation.

[0006] The purpose of the present invention is achieved as follows:

[0007] A depth inspection tool and inspection method for an open-hole spiral groove, the workpiece to be inspected has a first section and a second section. An outer cylindrical surface is provided on the first section, and a spiral groove is provided on the outer cylindrical surface. The groove hole of the spiral groove is an open hole, and the spiral groove spirally extends along the outer cylindrical surface. A stepped shape is formed between the first section and the second section. A workpiece positioning hole is provided on the second section, and the workpiece positioning hole and the outer cylindrical surface of the first section are coaxially arranged. The depth inspection tool and inspection method include:

[0008] A base handle, the base handle includes a positioning part, a cavity part, and a rotating handle arranged in sequence. The positioning part and the cavity part are both cylindrical. The positioning part is used for inserting into the workpiece positioning hole for positioning. The positioning part and the cavity part are coaxially arranged. A stepped hole is provided in the cavity part, and the axis line of the stepped hole is perpendicular to the axis line of the positioning part. The rotating handle is used to drive the base handle to rotate;

[0009] A positioning cover plate, the positioning cover plate is fixedly screwed on the large-diameter section of the stepped hole of the base handle. A measuring pin hole is axially provided on the positioning cover plate. The outer end of the positioning cover plate is provided with a D surface and an X surface. The D surface and the X surface form a stepped surface. The D surface and the X surface are located on both sides of the measuring pin hole. The height difference between the D surface and the X surface is the tolerance of the depth of the spiral groove;

[0010] Measuring pin, one end of the measuring pin is a measuring ball head for contacting the bottom wall of the spiral groove, the other end of the measuring pin is a measuring plane, this end of the measuring pin has a clearance fit with the measuring pin hole on the positioning cover plate, a supporting boss is provided on the measuring pin, one end of the measuring pin with the measuring ball head has a clearance fit in the small diameter section of the stepped hole of the base handle, a return spring is also sleeved on this end of the measuring pin, and both ends of the return spring act on the supporting boss and the positioning cover plate respectively; the supporting boss on the measuring pin has a clearance fit in the large diameter section of the stepped hole of the base handle;

[0011] Under the action of the spring force of the return spring, when the measuring ball head of the measuring pin fits on the bottom wall of the spiral groove and the measuring plane of the measuring pin is located between the D surface and the X surface of the positioning cover plate, the depth of the spiral groove is qualified.

[0012] Preferably, the base handle is provided with a fixing threaded hole, and the positioning cover plate is correspondingly provided with a cover plate threaded hole, and the fixing threaded hole and the cover plate threaded hole are connected and fixed by a locking screw.

[0013] Preferably, a cutting plane is provided at the orifice part of the stepped hole, the positioning cover plate is in the shape of a stepped shaft, and the stepped surface of the positioning cover plate is positioned on this cutting plane. The cavity part is coaxial with the first section of the outer circular surface and can be positioned with a clearance fit.

[0014] Preferably, one end of the groove hole of the workpiece spiral groove is an inclined plane inlet, and the other end of the groove hole of the workpiece spiral groove is provided with an edge edge. The measuring ball head of the measuring pin can cooperate with the edge edge of the spiral groove to lift the measuring pin under force and disengage it from the spiral groove. It is convenient to pull out the positioning part of the base handle from the workpiece positioning hole.

[0015] A measuring method for a depth gauge based on an open-hole spiral groove, comprising the following steps:

[0016] S1. Insert the positioning part of the base handle into the workpiece positioning hole, rotate and move the base handle to make the measuring ball head of the measuring pin fall into the spiral groove to be measured;

[0017] S2. Use a knife-edge ruler or the tactile method to check whether the measuring plane of the measuring pin is located between the D surface and the X surface of the positioning cover plate. If the measuring plane is between the D surface and the X surface, it is qualified, otherwise it is unqualified;

[0018] S3. Rotate and axially move the base handle to make the measuring ball head contact the rest of the spiral groove, and repeat step S2;

[0019] S4. Rotate and axially move the base handle to make the measuring ball head close to the edge of the spiral groove, continue to move the base handle to make the edge edge of the spiral groove press the measuring ball head and lift the measuring pin, and finally the measuring pin disengages from the spiral groove to complete the workpiece measurement.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] It is small, convenient, easy to detect, the detection is more intuitive, the positioning is accurate and reliable, the adjustment is convenient, and the operation is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the workpiece;

[0023] Figure 2 It is a schematic structural diagram of the present invention;

[0024] Figure 3 It is the front view of the base handle;

[0025] Figure 4 It is the side view of the base handle;

[0026] Figure 5 It is a schematic diagram of the positioning cover plate;

[0027] Figure 6 It is the front view of the measuring pin;

[0028] Figure 7 It is a schematic diagram of the measuring pin in the free state;

[0029] Figure 8 It is a schematic diagram of the state of measuring the D end;

[0030] Figure 9 It is a schematic diagram of the state of measuring the X end;

[0031] Figure 10 It is a schematic diagram of taking out the measuring tool. DETAILED DESCRIPTION OF THE INVENTION

[0032] A depth measuring tool for an open-hole spiral groove. It is used to measure the spiral groove on a workpiece. The spiral groove to be measured on the workpiece is as Figure 1 , located in a semi-open hole, and the workpiece has a round hole (workpiece positioning hole) concentric with the spiral groove. The workpiece to be detected has a first section and a second section. An outer cylindrical surface is provided on the first section, and a spiral groove is provided on the outer cylindrical surface. The groove hole of the spiral groove is an open hole, and the spiral groove spirally extends along the outer cylindrical surface. A stepped shape is formed between the first section and the second section. A workpiece positioning hole is provided on the second section, and the workpiece positioning hole and the outer cylindrical surface of the first section are coaxially arranged. One end of the groove hole of the workpiece spiral groove is an inclined surface inlet, and an edge edge is provided at the other end of the groove hole of the workpiece spiral groove.

[0033] See Figure 2 , a depth measuring tool and a measuring method for an open-hole spiral groove, including a base handle, a positioning cover plate, a measuring pin and a return spring. The base handle is as Figures 3 - 4As shown, the base handle is a shaft-like part with a cavity. The front end of the shaft includes a cylindrical surface for positioning (i.e., the positioning part), and a rotating handle at the rear end for gripping, enabling the base to rotate around the cylinder of the positioning part and move axially under the action of the handle. There is a stepped hole in the cavity. The small hole of the stepped hole is used to cooperate with the measuring pin to limit the measuring pin to only move axially. The large stepped hole cooperates with the positioning cover plate to limit the movement of the measuring pin not exceeding the design range. The base handle also has a cover plate threaded hole and a fixing threaded hole for fixing the positioning cover plate.

[0034] As Figure 5 shown, the positioning cover plate has a measuring pin hole for limiting the measuring pin to only move axially. There are two stepped planes (plane D and plane X) on the end face of the positioning cover plate. The plane dividing line passes through the center of the measuring pin hole. The height difference ΔH between the stepped planes is the required depth tolerance of the measured spiral groove. Planes D and X cooperate with the measuring plane of the measuring pin to determine whether the depth of the spiral groove meets the requirements.

[0035] As Figure 6 shown, the measuring pin is a shaft including a supporting boss, and a supporting return spring, enabling the measuring pin to always move away from the positioning cover plate under the action of the spring force (as Figure 7 is the position of the measuring pin in the free state). One end of the measuring pin shaft is a measuring plane for cooperating with the positioning cover plate, and the other end is a measuring ball head for contacting the part. The radius R of the measuring ball head can cause the measuring pin to lift under the force at the edge of the spiral groove.

[0036] As Figures 8 - 9 , when the base handle is rotated, making the measuring ball head contact the spiral groove, pressing the measuring pin to overcome the spring force of the return spring, the measuring plane of the measuring pin lifts, for indicating the state of the measuring pin.

[0037] A method for measuring the depth of an open-hole spiral groove, using the measuring device as described above to detect the depth of the open-hole spiral groove. It includes the following steps:

[0038] S1. Insert the positioning part of the base handle into the workpiece positioning hole, rotate and move the base handle to make the measuring pin fall into the spiral groove to be measured;

[0039] S2. Use a knife-edge ruler or the tactile method to check whether the measuring plane of the measuring pin is between plane D and plane X of the positioning cover plate. If the measuring plane is between plane D and plane X, it is qualified; otherwise, it is unqualified;

[0040] S3. Rotate and move the base handle to make the measuring ball head contact other positions of the spiral groove, and repeat step S2;

[0041] S4. Rotate and move the base handle to make the measuring ball head close to the edge of the spiral groove, continue to move the base handle to make the edge of the spiral groove press the ball head R to lift the measuring pin (as Figure 10 ), and finally separate from the spiral groove to complete the measurement of the workpiece.

[0042] The present invention can be applied to the depth detection of open-hole spiral grooves, with accurate and reliable positioning, convenient adjustment, and simple and safe operation.

[0043] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An open-hole spiral groove depth gauge and a detection method. The workpiece to be detected has a first section and a second section. An outer cylindrical surface is provided on the first section, and a spiral groove is provided on the outer cylindrical surface. The groove hole of the spiral groove is an open hole, and the spiral groove spirally extends along the outer cylindrical surface. A stepped shape is formed between the first section and the second section. A workpiece positioning hole is provided on the second section, and the workpiece positioning hole and the outer cylindrical surface of the first section are coaxially arranged. It is characterized in that, include: A base handle, the base handle comprises a positioning part, a cavity part, and a rotating handle which are arranged in sequence, the positioning part and the cavity part are both cylindrical, the positioning part is used to insert into the positioning hole of the workpiece for positioning, the positioning part and the cavity part are coaxially arranged, a step hole is arranged in the cavity part, the axis of the step hole is perpendicular to the axis of the positioning part, and the rotating handle is used to drive the base handle to rotate; A positioning cover plate, the positioning cover plate is threadedly fixed on the large diameter section of the step hole of the base handle, a measuring pin hole is axially provided on the positioning cover plate, a D surface and an X surface are provided on the outer end of the positioning cover plate, the D surface and the X surface form a step surface, the D surface and the X surface are located on both sides of the measuring pin hole, and the height difference between the D surface and the X surface is the tolerance of the spiral groove depth; A measuring pin, one end of which is a measuring ball head, which is used to contact the bottom wall of the spiral groove, and the other end of which is a measuring plane. This end of the measuring pin is clearance-matched with the measuring pin hole on the positioning cover plate. A supporting boss is provided on the measuring pin. One end of the measuring pin provided with the measuring ball head is clearance-matched in the small-diameter section of the step hole of the base handle. This end of the measuring pin is also sleeved with a reset spring, and the two ends of the reset spring act on the supporting boss and the positioning cover plate respectively. The supporting boss on the measuring pin is clearance-matched in the large-diameter section of the step hole of the base handle. Under the action of the reset spring force, the measuring ball head of the measuring pin fits on the bottom wall of the spiral groove. When the measuring plane of the measuring pin is located between the D surface and the X surface of the positioning cover plate, the depth of the spiral groove is qualified.

2. The depth gauge and detection method for an open-hole spiral groove according to claim 1, characterized in that: A fixing threaded hole is provided on the base handle, and a cover plate threaded hole is correspondingly provided on the positioning cover plate. The fixing threaded hole and the cover plate threaded hole are connected and fixed by locking screws.

3. The depth gauge and detection method for an open-hole spiral groove according to claim 1 or 2, characterized in that: A cutting plane is arranged at the opening of the step hole, the positioning cover plate is in the shape of a step shaft, and the step surface of the positioning cover plate is positioned on the cutting plane.

4. The depth gauge and detection method for an open-hole spiral groove according to claim 1, characterized in that: One end of the workpiece spiral groove hole is a bevel inlet, and the other end of the workpiece spiral groove hole is provided with an edge. The measuring ball head of the measuring pin can cooperate with the edge of the spiral groove, so that the measuring pin is lifted up by force and separated from the spiral groove.

5. A method for measuring the depth of the open hole spiral groove based on the depth gauge of claim 1, comprising the following steps: S1. Insert the positioning part of the base handle into the positioning hole of the workpiece, rotate and move the base handle so that the measuring ball head of the measuring pin falls into the spiral groove to be measured; S2. Use a knife edge ruler or tactile method to check whether the measuring plane of the measuring pin is located between the D surface and the X surface of the positioning cover. If the measuring plane is located between the D surface and the X surface, it is qualified, otherwise it is unqualified; S3, rotating and axially moving the base handle so that the measuring ball head contacts the rest of the spiral groove, and repeating step S2; S4. Rotate and axially move the base handle to bring the measuring ball head close to the edge of the spiral groove. Continue to move the base handle so that the edge of the spiral groove presses the measuring ball head and lifts the measuring pin. Finally, the measuring pin is separated from the spiral groove to complete the workpiece measurement.

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