Special gauge for detecting coaxiality of threaded hole and stepped hole of hydraulic valve body

Abstract

The invention relates to a special detection tool for detecting the coaxiality of a threaded hole and a stepped hole of a hydraulic valve body. The special detection tool comprises a detection tool main body which is used for being matched and tightened with a threaded hole of a detected part; the guide sleeve penetrates through the checking fixture main body along the central axis and is in clearance fit with the checking fixture main body; the transmission shaft penetrates through the side wall of the bottom of the guide sleeve and is in sliding fit with the guide sleeve, one end of the transmission shaft is an inclined slope surface, and the other end of the transmission shaft is provided with a coaxiality gauge measuring head used for being in contact with the inner wall of a stepped hole of a measured part; the guide rod and the dial indicator are sequentially arranged in the guide sleeve from bottom to top, the bottom of the guide rod abuts against the inclined slope surface of the transmission shaft, and the top of the guide rod abuts against a measuring head, fixed to the guide sleeve, of the dial indicator. Compared with the prior art, the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body and the like can be simply, conveniently, rapidly and accurately detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of coaxiality detection, and relates to a special inspection tool for detecting the coaxiality of a threaded hole and a stepped hole of a hydraulic valve body. Background Art

[0002] In the processing of a hydraulic valve body, the most common one is the valve seat assembly threaded hole. Due to the assembly accuracy requirements, the coaxiality between the pitch diameter of the threaded hole and the inner diameter of the stepped hole is required to be about 0.02 mm. It is already very difficult to detect the pitch diameter of the threaded hole, and then it is necessary to detect the coaxiality between the pitch diameter of the thread and the stepped hole. The difficulty can be imagined. At present, most of the methods use the three-coordinate spiral sampling method to measure the side of the thread to replace the pitch diameter method, and the coaxiality is evaluated by the three-coordinate. However, this method has low detection efficiency and low detection accuracy. Therefore, there is an urgent need for a simple, convenient and reliable detection method to solve the problem of rapid detection of the coaxiality of the thread and the stepped hole in the product production process. Summary of the Invention

[0003] The purpose of the present invention is to provide a special inspection tool for detecting the coaxiality of a threaded hole and a stepped hole of a hydraulic valve body, which can simply, quickly and accurately detect the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body and the like.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A special inspection tool for detecting the coaxiality of a threaded hole and a stepped hole of a hydraulic valve body, comprising:

[0006] An inspection tool main body for being screwed and tightened with the threaded hole of the part to be measured;

[0007] A guide sleeve penetrating through the inspection tool main body along the central axis and having a clearance fit therewith;

[0008] A transmission shaft passing through the bottom side wall of the guide sleeve and slidingly cooperating with the guide sleeve, one end of which is an inclined slope surface, and the other end is provided with a coaxiality gauge probe for contacting the inner wall of the stepped hole of the part to be measured;

[0009] And a guide rod and a dial indicator sequentially arranged in the guide sleeve from bottom to top. Wherein, the bottom of the guide rod abuts against the inclined slope surface of the transmission shaft, and the top abuts against the probe of the dial indicator fixed to the guide sleeve.

[0010] Further, the bottom end of the guide sleeve is closed and the upper part is open.

[0011] Further, the coaxiality gauge probe is spherical and is rotatably connected to the transmission shaft, so that the coaxiality gauge probe is in rolling contact with the inner wall of the stepped hole of the part to be measured.

[0012] Furthermore, the central axis of the guide sleeve coincides with the central axis of the gauge body.

[0013] Furthermore, the top of the guide sleeve extends out of the gauge body, and a positioning sleeve is fixedly sleeved on the part of the guide sleeve extending out of the gauge body. A positioning nut for positioning the positioning sleeve in the vertical direction is also provided on the top of the gauge body.

[0014] Even further, a flange protrusion extends outward from the bottom of the positioning sleeve. The positioning sleeve is arranged on the top of the gauge body in a threaded manner and presses against the flange protrusion.

[0015] More preferably, a through hole for the upper part of the positioning sleeve to pass through is also machined in the central area of the positioning sleeve.

[0016] Even further, the pressing degree of the positioning nut on the positioning sleeve satisfies that when the gauge body and the threaded hole of the part to be measured are tightened until the gap is eliminated, the guide sleeve and the gauge body can rotate relative to each other.

[0017] Even further, locking screw holes are provided at corresponding positions on the side walls of the positioning sleeve and the guide sleeve, and locking screws for relatively fixing the positioning sleeve and the guide sleeve are also provided at the locking screw holes.

[0018] Furthermore, a convex platform for easy screwing is also machined on the side of the gauge body.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. Good economy: The invention has a simple structure, small size, and low production cost. Compared with a coordinate measuring machine, the investment cost is greatly saved, and the economy is very good.

[0021] 2. Simple operation: The present invention does not require a high skill level for inspectors. General inspection skills can be mastered to independently complete the inspection. There is no need for a coordinate measuring machine inspection certificate and complex training. The inspector only needs to look at the operation instructions to perform the inspection. During operation, only tighten the thread and then rotate the dial indicator one week and read the value. The operation is simple and convenient.

[0022] 3. Efficiency improvement: The present invention greatly improves the inspection time of similar products, saving 80% of the inspection time compared with a coordinate measuring machine, and is suitable for large-scale inspection and full inspection work.

[0023] 4. Wide application range: The present invention is applicable to the detection of different stepped hole sizes of the same thread. When the stepped hole size changes greatly, only the coaxiality gauge probe with the corresponding length needs to be replaced, and it can be widely promoted and applied to various hole diameters. For different threaded holes, only the gauge body with the corresponding thread needs to be replaced to achieve the detection. Description of the Drawings

[0024] Figure 1 Schematic structural diagram of the inspection fixture of the present invention;

[0025] Explanation of the markings in the figure:

[0026] 1 - Inspection fixture main body; 2 - Guide sleeve; 3 - Guide rod; 4 - Part to be measured; 5 - Transmission shaft; 6 - Coaxiality gauge probe; 7 - Probe; 8 - Positioning nut; 9 - Positioning sleeve; 10 - Locking screw; 11 - Dial indicator; 12 - Boss; 13 - Flange protrusion. Specific embodiments

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0028] In the following embodiments or examples, if there is no special description of the functional components or structures, it means that they are all conventional components or conventional structures adopted in the art to achieve the corresponding functions.

[0029] To simply, quickly, and accurately detect the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body, etc., the present invention provides a special inspection fixture for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body, and its structure can be seen Figure 1 as shown, including:

[0030] An inspection fixture main body 1 for being screwed tightly with the threaded hole of the part 4 to be measured;

[0031] A guide sleeve 2 penetrating through the inspection fixture main body 1 along the central axis and having a clearance fit therewith;

[0032] A transmission shaft 5 passing through the bottom side wall of the guide sleeve 2 and slidingly cooperating with the guide sleeve 2, one end of which has an inclined slope surface, and the other end is provided with a coaxiality gauge probe 6 for contacting the inner wall of the stepped hole of the part 4 to be measured;

[0033] And a guide rod 3 and a dial indicator 11 sequentially arranged in the guide sleeve 2 from bottom to top. Among them, the bottom of the guide rod 3 abuts against the inclined slope surface of the transmission shaft 5, and the top abuts against the probe 7 of the dial indicator 11 fixed to the guide sleeve 2.

[0034] In some specific embodiments, the bottom end of the guide sleeve 2 is closed and the upper part is open.

[0035] In some specific embodiments, the coaxiality gauge probe 6 is spherical, and it is rotatably connected to the transmission shaft 5, so that the coaxiality gauge probe 6 makes rolling contact with the inner wall of the stepped hole of the part 4 to be measured.

[0036] In some specific embodiments, the central axis of the guide sleeve 2 coincides with the central axis of the gauge body 1.

[0037] In some specific embodiments, the top of the guide sleeve 2 extends out of the gauge body 1, and a positioning sleeve 9 is fixedly sleeved on the part of the guide sleeve 2 extending out of the gauge body 1. A positioning nut 8 for positioning the positioning sleeve 9 in the vertical direction is further provided at the top of the gauge body 1.

[0038] In a more specific embodiment, the bottom of the positioning sleeve 9 further extends outward to form a flange protrusion 13. The positioning sleeve 9 is arranged on the top of the gauge body 1 in a threaded manner and presses against the flange protrusion 13.

[0039] In a more preferred embodiment, a through hole through which the upper part of the positioning sleeve 9 passes is also machined in the central area of the positioning sleeve 9.

[0040] In a more specific embodiment, the pressing degree of the positioning nut 8 on the positioning sleeve 9 satisfies that when the gauge body 1 and the threaded hole of the part 4 to be measured are tightened until the gap is eliminated, the guide sleeve 2 and the gauge body 1 can rotate relative to each other.

[0041] In a more specific embodiment, locking screw holes are also provided at corresponding positions on the side walls of the positioning sleeve 9 and the guide sleeve 2, and locking screws 10 for making the positioning sleeve 9 and the guide sleeve 2 relatively fixed are also provided at the locking screw holes.

[0042] In some specific embodiments, a boss 12 convenient for screwing is also machined on the side surface of the gauge body 1.

[0043] The above embodiments can be implemented separately, or any two or more of them can be combined for implementation.

[0044] The above embodiments will be described in more detail below in combination with specific examples.

[0045] Example 1:

[0046] To simply, quickly and accurately detect the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body, etc., this example provides a special gauge for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body. Please refer to Figure 1 as shown, including:

[0047] A gauge body 1 for being screwed and matched with the threaded hole of the part 4 to be measured;

[0048] A guide sleeve 2 penetrating through the gauge body 1 along the central axis and having a clearance fit with it;

[0049] A transmission shaft 5 passes through the bottom side wall of the guide sleeve 2 and is in sliding fit with the guide sleeve 2. One end of the transmission shaft 5 has an inclined slope surface, and a coaxiality gauge probe 6 for contacting the inner wall of the stepped hole of the measured part 4 is provided at the other end.

[0050] A guide rod 3 and a dial indicator 11 are sequentially arranged in the guide sleeve 2 from bottom to top. Among them, the bottom of the guide rod 3 abuts against the inclined slope surface of the transmission shaft 5, and the top abuts against the probe 7 of the dial indicator 11 fixed to the guide sleeve 2. At the same time, an inclined surface structure matching the inclined slope surface of the transmission shaft 5 is also machined at the bottom of the guide rod 3.

[0051] The bottom end of the guide sleeve 2 is closed and the upper part is open. The coaxiality gauge probe 6 is spherical and is rotatably connected to the transmission shaft 5, so that the coaxiality gauge probe 6 makes rolling contact with the inner wall of the stepped hole of the measured part 4. The central axis of the guide sleeve 2 coincides with the central axis of the gauge body 1. The top of the guide sleeve 2 extends out of the gauge body 1, and a positioning sleeve 9 is fixedly sleeved on the part where the guide sleeve 2 extends out of the gauge body 1. A positioning nut 8 for positioning the positioning sleeve 9 in the vertical direction is also provided at the top of the gauge body 1. Exemplarily, a flange protrusion 13 extends outward from the bottom of the positioning sleeve 9, and a through hole for the upper part of the positioning sleeve 9 to pass through is machined in the central area of the positioning sleeve 9. The positioning sleeve 9 is threadedly arranged at the top of the gauge body 1 and presses the flange protrusion 13. The pressing degree of the positioning nut 8 on the positioning sleeve 9 satisfies that when the gauge body 1 and the threaded hole of the measured part 4 are tightened until the gap is eliminated, the guide sleeve 2 and the gauge body 1 can rotate relative to each other. Locking screw holes are also provided at the corresponding positions of the side walls of the positioning sleeve 9 and the guide sleeve 2, and locking screws 10 for making the positioning sleeve 9 and the guide sleeve 2 relatively fixed are provided at the locking screw holes. A convex platform 12 for convenient screwing is also machined on the side of the gauge body 1.

[0052] The working process of this embodiment is as follows:

[0053] As Figure 1As shown, screw the fixture body 1 into the threaded hole of the part to be measured 4 to achieve full tightening, eliminate the detection gap, and achieve the reference conversion to the center of the fixture body 1. At the same time, the guide sleeve 2 extends into the stepped hole below the threaded hole. Since the probe 7 of the dial indicator 11 presses downward against the guide rod 3 at this time, the coaxiality gauge probe 6 installed on the guide sleeve 2 contacts the inner wall of the stepped hole. Then, by rotating the positioning sleeve 9, the dial indicator 11 and the guide sleeve 2 are driven to rotate, and further drive the transmission shaft 5 and the coaxiality gauge probe 6 to rotate together. During the rotation of the coaxiality gauge probe 6, it will be compressed to different positions due to the change in the distance between the inner wall of the stepped hole and the rotation center of the fixture, thereby driving the guide rod 3 to move up and down through its inclined slope, and then transmitting this movement to the probe 7 of the dial indicator 11, and the reading of the dial indicator 11 is achieved according to the compression amount of the probe. Subtract the minimum value from the maximum value during a uniform rotation of one week, and that is the coaxiality value of the stepped hole of this product with respect to the reference of the threaded hole.

[0054] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body, characterized in that, Comprising: A gauge body for being screwed and tightened in cooperation with a threaded hole of a part to be measured; A guide sleeve penetrating through the gauge body along the central axis and having a clearance fit with the gauge body; A transmission shaft passing through the bottom side wall of the guide sleeve and having a sliding fit with the guide sleeve, one end of which is an inclined slope surface, and the other end is provided with a coaxiality gauge head for contacting the inner wall of a stepped hole of the part to be measured; And a guide rod and a dial indicator sequentially arranged in the guide sleeve from bottom to top, wherein the bottom of the guide rod abuts against the inclined slope surface of the transmission shaft, and the top abuts against the probe of the dial indicator fixed to the guide sleeve.

2. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 1, wherein, The bottom end of the guide sleeve is closed and the upper part is open.

3. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 1, wherein, The coaxiality gauge head is spherical and is rotatably connected to the transmission shaft, so that the coaxiality gauge head makes rolling contact with the inner wall of the stepped hole of the part to be measured.

4. A special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body according to claim 1, characterized in that, The central axis of the guide sleeve coincides with the central axis of the gauge body.

5. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 1, wherein, The top of the guide sleeve extends out of the gauge body, and a positioning sleeve is fixedly sleeved on the part where the guide sleeve extends out of the gauge body, and a positioning nut for positioning the positioning sleeve in the vertical direction is further provided on the top of the gauge body.

6. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 5, characterized in that The bottom of the positioning sleeve further extends outward to form a flange protrusion, and the positioning sleeve is threadedly arranged on the top of the gauge body and presses the flange protrusion.

7. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 6, characterized in that, A through hole for the upper part of the positioning sleeve to pass through is further machined in the central area of the positioning sleeve.

8. The special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of the hydraulic valve body according to claim 5, characterized in that The pressing degree of the positioning nut on the positioning sleeve satisfies that: when the gauge body and the threaded hole of the part to be measured are tightened until the clearance is eliminated, the guide sleeve and the gauge body can rotate relative to each other.

9. A special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body according to claim 5, characterized in that, Locking screw holes are further provided at corresponding positions on the side walls of the positioning sleeve and the guide sleeve, and locking screws for relatively fixing the positioning sleeve and the guide sleeve are further provided at the locking screw holes.

10. A special inspection tool for detecting the coaxiality of the threaded hole and the stepped hole of a hydraulic valve body according to claim 1, characterized in that, A convex platform for facilitating screwing is further machined on the side surface of the gauge body.

Images