Flange flatness gauge

Abstract

The application provides a flange flatness testing tool, which comprises a testing tool mechanism box, the testing tool mechanism box is in circumferential motion around the flange disc axis, a micrometer and a flange hole detection block are arranged in the testing tool mechanism box in a lifting mode, the flange hole detection block is fixedly connected with a first piston through a lifting rod, an extrusion spring is further arranged in a piston cylinder where the first piston is located, the extrusion spring extrudes the first piston downward under no external force, the flange hole detection block drives the lifting piston rod to move synchronously in the lifting process, the application is designed according to the special hole structure of the flange disc, which directly avoids the radial extrusion or axial large floating expansion vibration of the measuring rod of the micrometer after the measuring rod passes through the pit hole area, and the measuring rod always measures the flatness along the smearing track of the lubricating oil in the measuring process, so that the micrometer can accurately measure any position of the flange disc.

Description

Technical Field

[0001] This invention relates to the field of flange flatness testing devices, specifically a flange flatness inspection tool. Background Technology

[0002] The prior art, disclosed in patent number "CN110186363A", discloses a flatness measuring device and method. The measuring device mainly includes a linear motor, a mechanical dial indicator, a camera, a connecting rod, and a control processor. The linear motor is placed next to the surface to be measured, and the slider of the linear motor moves parallel to the surface to be measured. The mechanical dial indicator and the camera are mounted on the slider of the linear motor via the connecting rod. The contact of the mechanical dial indicator extends to the surface to be measured. The measurement method and steps include: dividing the surface to be measured into equally spaced parallel strips using multiple straight lines; drawing a straight line perpendicular to the parallel strips; the control processor controlling the linear motor to move the lever indicator and camera on the slider; the mechanical lever indicator providing displacement change values ​​relative to the measured position; and the camera synchronously recording the dial pointer position of the mechanical lever indicator. By measuring the relative displacement changes on all straight lines, the flatness of the surface to be measured is obtained. This device can efficiently and automatically achieve flatness measurement.

[0003] However, the aforementioned flatness measuring device still has some obvious defects in use: the object to be tested based on the dial indicator needs to have a smooth surface without pits or grooves. This is because the dial indicator, as a precision mechanical instrument, cannot be subjected to radial resistance during the translational sliding process of its measuring rod, otherwise it may cause radial displacement of the measuring rod and permanent failure. At the same time, the measuring rod of the dial indicator cannot undergo large axial extension and contraction vibration to ensure the measurement accuracy of the dial indicator. However, in large flange workpieces, the flange plate is provided with several flange holes around the axis. Due to the presence of these flange holes, the aforementioned flatness measuring device cannot smoothly perform flatness testing of the flange hole position. In addition, during the dial indicator measurement process, the flange plate surface may cause wear of the measuring rod during friction with the measuring rod pin, thereby affecting the testing accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a flange flatness inspection tool to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A flange flatness inspection tool includes an inspection mechanism box that rotates in a circular motion around the flange axis. A dial indicator and a flange hole detection block are vertically mounted inside the inspection mechanism box. The flange hole detection block is fixedly connected to a first piston via a lifting rod. The dial indicator is fixedly connected to a second piston via a lifting frame. The first and second pistons are respectively located in a pair of piston cylinders within the inspection mechanism box, and the piston cylinders are connected by an oil passage. A compression spring is also provided in the piston cylinder containing the first piston to press it downwards without external force. The first and second pistons move in opposite directions. The measuring rod of the dial indicator rests against the flange surface to inspect its flatness.

[0007] A lifting piston rod is also fixedly connected to the flange hole detection block. The lifting piston rod is inserted into the oil supply cylinder body of the inspection tool mechanism box. A coating block is also provided at the bottom of the flange hole detection block. The coating block is connected to the oil supply cylinder body through a channel opened inside the flange hole detection block. During the lifting and lowering process, the flange hole detection block drives the lifting piston rod to move synchronously. During the synchronous lifting and lowering process of the lifting piston rod, the lubricating oil stored inside the oil supply cylinder body flows unidirectionally from the oil supply cylinder body to the coating block side. The oil supply cylinder body is connected to the sealed oil supply chamber provided in the inspection tool mechanism box. The measuring rod of the dial indicator is located at the rear of the contact path between the coating block and the flange.

[0008] Preferably, the inspection tool mechanism box is located on both sides of the smear block and is also movably mounted with mating wheels via a rotating shaft.

[0009] Preferably, the dial indicator is a mechanical dial indicator or an electronic digital dial indicator.

[0010] Preferably, the dial indicator is detachably installed in the mating slot of the lifting frame via mating blocks on both sides.

[0011] Preferably, a flow control block is also provided in the oil passage in a lifting manner. The flow control block is fixedly connected to the lifting screw. The inspection mechanism box is also provided with a threaded sleeve that cooperates with the lifting screw. During the rotation of the lifting screw, the flow control block is driven to move up and down, thereby controlling the flow rate of hydraulic oil in the oil passage.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This invention can not only perform flatness inspection on conventional flat workpieces, but also has a special design for the special hole structure of flanges. This allows the probe of the dial indicator to automatically rise and skip the opening area when it passes through the flange hole, and then maintain contact with the flange surface again after passing through the opening area. This directly avoids the radial compression or large axial floating and stretching vibration of the dial indicator probe after passing through the grooved hole area, ensuring that the dial indicator can accurately measure any position of the flange.

[0014] 2. This invention pumps lubricating oil during the lifting and lowering process of the gauge mechanism box, ensuring that the measuring rod always follows the lubricating oil application path during the measurement process to measure flatness. This effectively prevents long-term friction and wear between the measuring rod pin and the flange surface, thereby further ensuring measurement accuracy.

[0015] This invention is specifically designed for the special perforated structure of flanges, directly avoiding the radial compression or large axial floating and expansion vibrations that the dial indicator's probe suffers after passing through the perforated area. At the same time, the probe always measures the flatness along the lubricant application path during the measurement process, ensuring that the dial indicator can accurately measure any position of the flange. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flange hole detection block and the lifting process of the measuring rod according to the present invention;

[0017] Figure 2 This is a cross-sectional view of the inspection tool mechanism box of the present invention;

[0018] Figure 3 This is a schematic diagram of the enlarged structure of region A of the present invention;

[0019] Figure 4 This is a schematic diagram of the dial indicator connection structure of the present invention;

[0020] Figure 5 This is a schematic diagram showing the installation position of the coating block according to the present invention;

[0021] Figure 6 This is a schematic diagram illustrating the principle of the measuring rod avoiding the flange hole in this invention.

[0022] In the diagram: 1 Inspection tool box, 2 Flange, 3 Dial indicator, 4 Flange hole inspection block, 5 Lifting rod, 6 First piston, 7 Lifting frame, 8 Second piston, 9 Piston cylinder, 10 Oil passage, 11 Compression spring, 12 Lifting piston rod, 13 Oil supply cylinder body, 14 Spreading block, 15 Measuring rod, 16 Fitting wheel, 17 Fitting block, 18 Fitting groove, 19 Flow control block, 20 Lifting screw, 21 Threaded sleeve, 22 Flange hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-6 The present invention provides a technical solution:

[0025] Example 1:

[0026] A flange flatness inspection tool includes an inspection mechanism box 1, which rotates around the axis of a flange 2. A dial indicator 3 and a flange hole detection block 4 are installed in the inspection mechanism box 1 in a lifting manner. The flange hole detection block 4 is fixedly connected to a first piston 6 via a lifting rod 5. The dial indicator 3 is fixedly connected to a second piston 8 via a lifting frame 7. The first piston 6 and the second piston 8 are respectively installed in a pair of piston cylinders 9 opened in the inspection mechanism box 1. The piston cylinders 9 are connected to each other via an oil passage 10. A compression spring 11 is also installed in the piston cylinder 9 where the first piston 6 is located, which presses the first piston 6 downward without external force. The movement directions of the first piston 6 and the second piston 8 are opposite. The measuring rod 15 of the dial indicator 3 abuts against the surface of the flange 2 to detect its flatness.

[0027] A lifting piston rod 12 is also fixedly connected to the flange hole detection block 4. The lifting piston rod 12 is inserted into the oil supply cylinder 13 in the inspection tool mechanism box 1. A coating block 14 is also provided at the bottom of the flange hole detection block 4. The coating block 14 is connected to the oil supply cylinder 13 through a channel opened inside the flange hole detection block 4. During the lifting and lowering process, the flange hole detection block 4 drives the lifting piston rod 12 to move synchronously. During the synchronous lifting and lowering process of the lifting piston rod 12, the lubricating oil stored inside the oil supply cylinder 13 flows unidirectionally from the oil supply cylinder 13 to the coating block 14. The oil supply cylinder 13 is connected to the sealed oil supply chamber in the inspection tool mechanism box 1. The measuring rod 15 of the dial indicator 3 is located at the rear of the contact path between the coating block 14 and the flange 2.

[0028] In this embodiment, the fixture mechanism box 1 serves as the flange flatness detection mechanism. During the detection process, this mechanism can be fixedly set, and the flange 2 is rotated around the axis under the drive of the drive mechanism to complete the flatness detection. Alternatively, the flange 2 can be fixed and connected to the fixture mechanism box 1 through a rotating mechanism. The rotating mechanism drives the fixture mechanism box 1 to move, thereby completing the flatness measurement of the flange 2. The relevant drive mechanism is a commonly used structural form in the prior art, and will not be described in detail again. The difference from the prior art is that, in addition to setting the dial indicator 3, this application also sets a flange detection block 4. The flange detection block 4 is used to detect the flange hole 22, thereby adjusting the position of the dial indicator 3 to ensure that the measuring rod 15 of the dial indicator 3 can pass the flange hole in time, preventing the axial and radial of the measuring rod 15 from being squeezed or vibrated, which would affect the normal use of the dial indicator 3. Specifically, this is achieved by the lifting and lowering of the first piston 6 and the second piston 8 in the piston cylinder 9, as shown in the appendix of the specification. Figure 2 and 3 When the first piston 6 rises, the hydraulic oil inside the piston cylinder 9 enters the hydraulic cylinder 9 containing the second piston 8 through the oil passage 10. At this time, the second piston 8 descends. In addition, due to the expansion coefficient of the internally stored hydraulic oil and the certain lag in the hydraulic oil passing through the oil passage 10, there is a certain lag between the rise of the first piston 8 and the descent of the second piston 8, and vice versa. Therefore, when the inspection mechanism box 1 passes through the flange hole 22, after the flange hole detection block 4 is fully inserted into the flange hole 22, the first piston 6 moves down under the push of the compression spring 11. At this time, due to the influence of the flow rate of the oil passage 10 and the resistance of the hydraulic oil viscosity, the movement of both the first and second pistons is relatively slow, thus ensuring that the measuring rod 15 can move slowly upward and pass smoothly when passing above the flange hole 22. This avoids the radial compression or large axial floating and contraction vibration that the dial indicator's probe suffers after passing through the pitted area, ensuring that the dial indicator can accurately measure any position of the flange. When the flange hole detection block 4 is pushed out of the flange hole 22, the flange hole detection block 4 moves upward rapidly. At this time, the hydraulic oil pressure in the piston cylinder 9 where the first piston 6 is located increases rapidly. Since its flow through the oil passage 10 is limited, the descent of the second piston 8 is still relatively slow. The flow rate of the oil passage 10 is adjusted according to the linear speed of the drive mechanism and the flow rate of the drive mechanism, so that when the probe 15 passes over the flange hole 22, it can quickly return to its original position. At this time, the probe 15 is again in contact with the flange 2. In the above manner, multiple flange hole 22 positions can be skipped continuously until the complete circumferential flatness measurement of the entire flange 2 is completed.

[0029] Meanwhile, in order to minimize the wear between the probe area of ​​the probe 15 and the surface of the flange 2 during the flatness measurement process, the lifting piston rod 12 moves up and down with the flange hole detection block 4 during each lifting and lowering process. The lifting piston rod 12 moves up and down within the oil supply cylinder 13. By setting a one-way liquid inlet valve in the lifting piston rod 12, and cooperating with the one-way air inlet valve in the sealed oil supply tank, the lubricating oil stored in the sealed oil supply tank flows unidirectionally from the oil supply cylinder 13 to the coating block 14 during each lifting and lowering process. This allows the front end of the probe 15's movement path to be lubricated in advance. After lubrication, the coefficient of friction can be greatly reduced, thereby reducing the wear at the head of the probe 15. In order to reduce the friction between the gauge mechanism box 1 and the surface of the flange 2, the gauge mechanism box 1 is also equipped with mating wheels 16 on both sides of the coating block 14 via rotating shafts.

[0030] Example 2:

[0031] The dial indicator 3 is either a mechanical dial indicator or an electronic digital dial indicator. The dial indicator 3 is detachably installed in the mating groove 18 of the lifting frame 7 via mating blocks 17 on both sides. In this embodiment, the dial indicator 3 can be selected from two commonly used structural forms in the prior art, preferably an electronic digital dial indicator. By connecting the dial indicator to a computer, the flatness parameter measurement data can be transmitted to the computer in real time, thereby ensuring the intuitive presentation of the measurement results. Furthermore, in order to ensure the accuracy of the dial indicator 3 and facilitate its daily maintenance, the dial indicator 3 is detachably installed on the inspection mechanism box 1. The close cooperation between the mating blocks 17 and the mating groove 18 ensures the accuracy of the dial indicator 3 during the measurement process.

[0032] Example 3:

[0033] A flow control block 19 is also installed in the oil passage 10 in a lifting manner. The flow control block 19 is fixedly connected to the lifting screw 20. The inspection mechanism box 1 is also provided with a threaded sleeve 21 that cooperates with the lifting screw 20. During the rotation of the lifting screw 20, it drives the flow control block 19 to move up and down, thereby controlling the flow rate of hydraulic oil in the oil passage 10. By rotating the lifting screw 20, the flow control block 19 is moved up and down, thereby adjusting the cross-sectional area of ​​the oil passage 10. This adjustment method can adjust the lifting hysteresis interval between the first piston 6 and the second piston 8, ensuring that the measuring rod 15 can pass smoothly through the flange hole 22.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flange flatness inspection tool, comprising an inspection tool mechanism box, characterized in that: The inspection fixture mechanism box revolves around the flange axis. A dial indicator and a flange hole detection block are installed in the inspection fixture mechanism box in a lifting manner. The flange hole detection block is fixedly connected to the first piston through a lifting rod. The dial indicator is fixedly connected to the second piston through a lifting frame. The first piston and the second piston are respectively installed in a pair of piston cylinders opened in the inspection fixture mechanism box. The piston cylinders are connected to each other through an oil passage. The piston cylinder where the first piston is located is also equipped with a compression spring that presses the first piston downward without external force. The first piston and the second piston move in opposite directions. The measuring rod of the dial indicator abuts against the surface of the flange to detect its flatness. A lifting piston rod is also fixedly connected to the flange hole detection block. The lifting piston rod is inserted into the oil supply cylinder body of the inspection tool mechanism box. A coating block is also provided at the bottom of the flange hole detection block. The coating block is connected to the oil supply cylinder body through a channel opened inside the flange hole detection block. During the lifting and lowering process, the flange hole detection block drives the lifting piston rod to move synchronously. During the synchronous lifting and lowering process of the lifting piston rod, the lubricating oil stored inside the oil supply cylinder body flows unidirectionally from the oil supply cylinder body to the coating block side. The oil supply cylinder body is connected to the sealed oil supply chamber provided in the inspection tool mechanism box. The measuring rod of the dial indicator is located at the rear of the contact path between the coating block and the flange.

2. The flange flatness inspection tool according to claim 1, characterized in that: The inspection tool mechanism box is located on both sides of the smear block and is also equipped with mating wheels via a rotating shaft.

3. The flange flatness inspection tool according to claim 1, characterized in that: The dial indicator is either a mechanical dial indicator or an electronic digital dial indicator.

4. The flange flatness inspection tool according to claim 3, characterized in that: The dial indicator is detachably installed in the groove of the lifting frame via mating blocks on both sides.

5. A flange flatness inspection tool according to any one of claims 1 or 4, characterized in that: A flow control block is also installed in the oil passage in a lifting manner. The flow control block is fixedly connected to the lifting screw. The inspection mechanism box is also provided with a threaded sleeve that cooperates with the lifting screw. During the rotation of the lifting screw, the flow control block is driven to move up and down, thereby controlling the flow rate of hydraulic oil in the oil passage.

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