Measuring device for inner diameter of deep hole

Abstract

The utility model provides a device for measuring the inner diameter of a deep hole, which relates to the technical field of measuring tools for measuring parts, and comprises a connecting cylinder, two ends of which are respectively communicated with a first mounting cylinder and a second mounting cylinder; a first through hole is formed in the first mounting cylinder, a guide cylinder communicated with the first through hole is arranged, and a second through hole is formed in the guide cylinder; a spring piece is arranged on the connecting cylinder; an induction coil is arranged in the first mounting cylinder, and a connecting socket electrically connected with the induction coil is arranged on the second mounting cylinder; the measuring shaft is in sliding connection with the first through hole, the outer wall of the measuring shaft is fixedly connected with the spring piece, and an opening is formed in the induction coil; the display is inserted into the connecting socket through a cable; wherein the two guide cylinders and the two measuring shafts are symmetrically arranged on the first mounting cylinder in a one-to-one correspondence manner. According to the utility model, the inner diameter of the deep hole measured by the measuring tool can be fed back in time, the measuring period is shortened, and part scrapping caused by the fact that the measuring tool is clamped in the deep hole can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools for parts measurement, in particular to a measuring device for the inner diameter of a deep hole. Background Art

[0002] During the production, processing and use of deep hole workpieces, problems such as processing errors, wear and tear, and local corrosion will affect their inner diameter, thus affecting their normal use. Therefore, during the delivery and use of the workpiece, the inner diameter of the deep hole of the workpiece must be measured at different locations to determine whether its inner diameter meets the requirements. Currently, the main methods for measuring the inner diameter of deep holes are rod-type internal diameter dial indicators and go / no-go gauges. Among them, rod-type internal diameter dial indicators are mainly used to measure short deep holes (generally less than 1.5m in length). When the length is longer, the measuring stem itself is thin and will bend during the measurement process, which will make it more difficult to measure the deep hole and the size is inaccurate. In addition, the dial indicator is a pointer type, so the human error is large during the calibration before measurement, and the results obtained after the measurement need to be averaged multiple times, which increases the complexity of the measurement and reduces the efficiency. The go / no-go gauge is generally used to measure shallower holes and longer hole openings. When using the go / no-go gauge to measure deeper holes, there is a risk of the gauge getting stuck in the inner hole, causing the part to be scrapped, and the inner hole diameter size cannot be fed back. In summary, the existing measuring tools for deep hole workpieces have the problems of untimely feedback of measurement results, long measurement cycles, and the risk of the measuring tool getting stuck in the deep hole. Utility Model Content

[0003] In order to solve the problems of the existing deep hole inner diameter measuring device, such as the untimely feedback of measurement results, the long measurement cycle and the easy occurrence of the measuring tool getting stuck in the deep hole, the utility model provides a measuring device for the deep hole inner diameter, which can timely feed back the deep hole inner diameter size measured by the measuring tool, shorten the measurement cycle, and also prevent the measuring tool from getting stuck in the deep hole and causing the parts to be scrapped.

[0004] The technical solution adopted in this utility model is:

[0005] A device for measuring the inner diameter of a deep hole is provided, comprising:

[0006] A connecting tube, wherein both ends of the connecting tube are respectively connected to the first mounting tube and the second mounting tube, a first through hole is provided on the side wall of the first mounting tube, a guide tube connected to the first through hole is provided on the outer wall of the first mounting tube, and a second through hole is provided on the side wall of the guide tube; a spring sheet is provided on the outer wall of the connecting tube, and the free end of the spring sheet passes through the second through hole; an induction coil is provided inside the first mounting tube, and a connection socket electrically connected to the induction coil is provided on the free end of the second mounting tube;

[0007] A measuring shaft is slidably connected to the first mounting cylinder through the first through hole, an outer wall of the measuring shaft is fixedly connected to the spring sheet, and an opening for the measuring shaft to pass through is formed on the side wall of the induction coil;

[0008] Monitor, which is plugged into a connection socket via a cable;

[0009] There are two guide cylinders and two measuring shafts, and there is a one-to-one correspondence between the guide cylinders and the measuring shafts. The guide cylinders are symmetrically arranged along the central axis of the first mounting cylinder.

[0010] In some embodiments of the present invention, the inner diameter of the induction coil is equal to the outer diameter of the measuring shaft.

[0011] In some embodiments of the present invention, a first guide ring is sleeved on the outer wall of the first mounting tube, and a nut is threadedly connected to the free end of the first mounting tube; a support ring is circumferentially provided on the outer wall of the connecting tube, and a spiral coil is threadedly connected to the outer wall of the connecting tube, and a second guide ring sleeved on the connecting tube is provided between the support ring and the spiral coil.

[0012] In some embodiments of the present invention, a bearing is provided between the second mounting tube and the connecting tube, the bearing is sleeved on the second mounting tube, the bearing is provided with a stud sleeved on the connecting tube, a connecting rod is threadedly connected to the stud, the interior of the connecting rod is hollow, and the inner diameter of the connecting rod is larger than the outer diameter of the second mounting tube.

[0013] In some embodiments of the present invention, a hollow extension rod is threadedly connected to the free end of the connecting rod.

[0014] In some embodiments of the present invention, a curved sliding block is provided on the end of the measuring block that contacts the part.

[0015] In some embodiments of the present invention, a third through hole is formed on both the first guide ring and the second guide ring.

[0016] In some embodiments of the present invention, an outer wall of the first guide ring is provided with an inclined surface inclined toward the central axis of the connecting tube.

[0017] The beneficial effects of the utility model are:

[0018] 1. First turn on the display and record the maximum distance between the two measuring axes when the spring sheet is in a free state. Then manually adjust the measuring axes at both ends of the side wall of the first mounting tube so that the measuring axes move toward the inside of the first mounting tube, allowing the whole to enter the deep hole to be measured. After entering the deep hole, the measuring axis will contact the inner wall of the part in the deep hole, and as the whole moves toward the deep hole on the part, the inner diameter of the deep hole changes, and the measuring axis will also change accordingly, that is, the inner diameter of the deep hole becomes smaller, and the measuring axes at both ends of the first mounting tube will slide toward the central axis of the first mounting tube. Since the induction coil and the connecting socket are electrically connected, the induction coil will be energized to generate a magnetic field. When the measuring axis moves, it will cut the magnetic field generated by the induction coil, thereby changing the magnetic flux passing through the two measuring axes. According to the formula for magnetic flux It can be seen that the current magnitude remains unchanged, the magnetic induction intensity B remains unchanged, and when the measuring axis moves, the area S perpendicular to the magnetic field line will change, resulting in the magnetic flux changes, so the processor in the display can convert the changing magnetic flux Record and amplify the data into numerical values, so as to measure the aperture of deep holes in parts. The measurement results are fed back in time, shortening the measurement cycle.

[0019] 2. As the measuring device goes deeper, the aperture of the deep hole of the part changes, and the two measuring shafts on the first mounting cylinder will also be displaced relative to each other. When the inner diameter of the deep hole of the part is too small to continue the in-depth detection, the spring sheet connected to the measuring shaft can prevent the measuring shaft from getting stuck in the deep hole of the part, thereby preventing the part from being scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a diagram of the composition of the measuring device;

[0022] Figure 2 It is a structural diagram of the two ends of the connecting tube in the measuring device;

[0023] Figure 3 This is a front view of the induction coil in the measuring device;

[0024] Figure 4 Schematic diagram of the structure of the extension rod in the measuring device.

[0025] Reference numerals:

[0026] 1-connecting cylinder, 10-spring sheet, 11-support ring, 2-first mounting cylinder, 20-first through hole, 21-guide cylinder, 22-second through hole, 23-measuring shaft, 24-arc slider, 25-induction coil, 26-nut, 3-second mounting cylinder, 30-connecting socket, 31-bearing, 32-stud, 4-display, 40-cable, 5-first guide ring, 6-second guide ring, 60-third through hole, 7-connecting rod, 8-extension rod, 80-fixing ring. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0028] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0029] The embodiments of the utility model are described in detail below with reference to the accompanying drawings. Example

[0030] like Figure 1 and Figure 2 As shown, this embodiment provides a device for measuring the inner diameter of a deep hole, comprising:

[0031] Connecting tube 1, with the first and second mounting tubes 2 and 3 connected at both ends. A first through-hole 20 is formed in the side wall of the first mounting tube 2. A guide tube 21 is formed on the outer wall of the first mounting tube 2, communicating with the first through-hole 20. A second through-hole 22 is formed in the side wall of the guide tube 21. A spring piece 10 is provided on the outer wall of the connecting tube 1, with the free end of the spring piece 10 passing through the second through-hole 22. An induction coil 25 is provided inside the first mounting tube 2, and a connection socket 30 electrically connected to the induction coil 25 is provided on the free end of the second mounting tube 3.

[0032] The measuring shaft 23 is slidably connected to the first mounting cylinder 2 through the first through hole 20. The outer wall of the measuring shaft 23 is fixedly connected to the spring sheet 10. The side wall of the induction coil 25 is provided with an opening for the measuring shaft 23 to pass through.

[0033] Display 4, which is plugged into the connection socket 30 via a cable 40;

[0034] There are two guide cylinders 21 and two measuring shafts 23 , and there is a one-to-one correspondence between the guide cylinders 21 and the measuring shafts 23 . The guide cylinders 21 are symmetrically arranged along the central axis of the first mounting cylinder 2 .

[0035] The connection between the first mounting tube 2, the connecting tube 1 and the second mounting tube 3 is threaded. The connection between the spring sheet 10 and the outer wall of the connecting tube 1 is bolted, which facilitates the disassembly and replacement of the spring sheet 10. When the display 4 is in use, in order to improve the measurement accuracy and facilitate quick reading of data, a calibration gauge can be used to calibrate (reset to zero) the measurement signal and value of the display 4. The inner diameter of the connecting tube 1 becomes smaller in the direction of the second mounting tube 3, and the inner diameter of the second mounting tube 3 becomes smaller in the direction of the connecting tube 1. The purpose is to make the size difference between the various parts of the overall measuring device not much different, so as to avoid affecting the measuring device from entering the deep hole of the part. The first through hole 20 opened on the guide tube 21 faces one end of the connecting tube 1. It is worth noting that the connecting tube 1, which is threadedly connected to the first mounting tube 2, does not block the first through hole 20 and the second through hole 22, so as to avoid affecting the movement of the measuring shaft 23. There are two guide cylinders 21, and the measuring shafts 23 are arranged in positions corresponding to the number of guide cylinders 21. The guide cylinders 21 are 180° apart, that is, the two guide cylinders 21 are symmetrically arranged with the central axis of the first mounting cylinder 2 as the axis of symmetry. An opening is opened in the middle of the induction coil 25 to allow the measuring shaft 23 to pass through. The remaining portion of the induction coil 25 on the same side wall as the opening of the induction coil 25 is cut off. This remaining portion of the induction coil 25 extends closely along the opening toward the central axis of the induction coil 25, and then continues to wind in the same direction at the other end of the induction coil 25 that has not been cut off. In addition, the outer diameter of the induction coil 25 is equal to the inner diameter of the first mounting cylinder 2. When the measuring shaft 23 is in a free state, a portion of the measuring shaft 23 is located within the induction coil 25, which can support the induction coil 25 and prevent it from displacement.

[0036] During use, the measuring shaft 23 will move according to the different inner diameters of the deep hole in the part. During the movement of the measuring shaft 23, the spring piece 10 set on it will be driven to move. Since the spring piece 10 is fixedly connected to the measuring shaft 23, and the interpolation of the inner diameter size change inside the deep hole of the part will not be too large, the spring piece 10 is within the range of deformation recovery. When the inner diameter of the hole becomes smaller, the measuring shaft 23 moves toward the inside of the first mounting tube 2, and the gap between the two measuring shafts 23 becomes smaller. The magnetic flux of the magnetic field generated by the power supply of the induction coil 25 will decrease. By recording the change in magnetic flux, the gap area between the two measuring shafts 23 is obtained, and the distance moved by the measuring shaft 23 is converted. Finally, the length of the measuring shaft 23 is added to obtain the inner diameter of the hole. When the inner diameter of the hole becomes larger, it can be intuitively displayed on the display 4 as in the above process, and the value of the inner diameter of the hole that can be measured by the measuring shaft 23 at any position is obtained.

[0037] Further, such as Figure 2 and Figure 4 As shown, the inner diameter of the induction coil 25 is equal to the outer diameter of the measuring shaft 23 .

[0038] The measuring shaft 23 will pass through the induction coil 25. The measuring shaft 23 inside the induction coil 25 fits in with the inner wall of the induction coil 25, that is, the outer diameter of the measuring shaft 23 is equal to the inner diameter of the induction coil 25. When the measuring shaft 23 moves, the gap area between the measuring shafts 23 inside the induction coil 25 will change. The calculation of this part of the changed area is relatively convenient. If the two measuring shafts 23 are in contact with each other in the induction coil 25, the two measuring shafts 23 at this time divide the induction coil 25 into two, and the induction coil 25 is completely enclosed by the measuring shaft 23, and no magnetic flux passes through. When the measuring shaft 23 starts to move and change, a gap will be generated between the two measuring shafts 23, and a magnetic field will pass through the gap. The magnetic flux of this gap can be recorded and the moving distance of the measuring shaft 23 can be calculated using the formula.

[0039] During use, the measuring shaft 23 and the inner wall of the induction coil 25 are in close contact with each other, so as to avoid a gap between the measuring shaft 23 and the inner wall of the induction coil 25, which would make the measured magnetic flux conversion process more complicated.

[0040] Further, such as Figure 1 and Figure 2 As shown, a first guide ring 5 is sleeved on the outer wall of the first mounting tube 2, and a nut 26 is threadedly connected to the free end of the first mounting tube 2; a support ring 11 is circumferentially provided on the outer wall of the connecting tube 1, and a spiral coil is threadedly connected on the outer wall of the connecting tube 1, and a second guide ring 6 sleeved on the connecting tube 1 is provided between the support ring 11 and the spiral coil.

[0041] The first guide ring 5 is fixed to the free end of the first mounting tube 2 by a nut 26. The nut 26 threaded onto the first mounting tube 2 seals the first mounting tube 2, preventing debris from deep holes in the parts from entering the interior of the first mounting tube 2 when the measuring device is measuring, thereby preventing the induction coil 25 and the measurement results of the measuring head from being affected. The support plate is arranged on the outer wall of the connecting tube 1 and is an integrally formed structure with the connecting tube 1. The support ring 11 is used to place the second guide ring 6, which serves as an auxiliary guide for the entire measuring device. The support ring 11 is fixed by a screw threaded onto the outer wall of the connecting tube 1 to prevent the second guide ring 6 from moving.

[0042] During use, as the measuring device enters the hole on the part, the first guide ring 5 and the second guide ring 6 can guide and stabilize the entire measuring device. When only the measuring shafts 23 at both ends of the first mounting cylinder 2 in the measuring device are in contact with the inner wall of the part, the measuring device is prone to tilt, which will cause the data measured by the measuring shaft 23 to be inaccurate. After setting the first guide ring 5 and the second guide ring 6, it can prevent the measuring device from offsetting during measurement, which may cause inaccurate measurement results.

[0043] Further, such as Figure 1 and Figure 2 As shown, a bearing 31 is provided between the second mounting tube 3 and the connecting tube 1. The bearing 31 is sleeved on the second mounting tube 3. A stud 32 sleeved on the connecting tube 1 is provided on the bearing 31. A connecting rod 7 is threadedly connected to the stud 32. The interior of the connecting rod 7 is hollow, and the inner diameter of the connecting rod 7 is larger than the outer diameter of the second mounting tube 3.

[0044] The bearing 31 is located between the connecting tube 1 and the second mounting tube 3, and the bearing 31 is sleeved on the second mounting tube 3. A stud 32 is provided on the side of the bearing 31 facing the first mounting tube 2. The stud 32 is hollow and sleeved on the connecting tube 1. The outer wall of the stud 32 is connected to the connecting rod 7 through an external thread. The connecting rod 7 is a hollow rod body, and the inner hole diameter of the connecting rod 7 is larger than the outer diameter of the second mounting tube 3. The bearing 31 and the connecting socket 30 are located inside the connecting rod 7, that is, the connecting rod 7 is used to protect the connecting socket 30 and the bearing 31, etc., and to increase the length of the entire measuring device.

[0045] When in use, the connecting rod 7 is connected by the threaded connection of the stud 32 so that the connecting rod 7 can protect the connecting socket 30 and the bearing 31 located on the second mounting tube 3 when the length of the measuring device is increased.

[0046] Further, such as Figure 1 、 Figure 2 and Figure 4 As shown, a hollow extension rod 8 is threadedly connected to the free end of the connecting rod 7.

[0047] An internal thread is provided on the inner wall of the end of the connecting rod 7 away from the connecting tube 1, and is threadedly connected to an extension rod 8. The extension rod 8 is a hollow rod body, with an external thread provided on the end where it is threadedly connected to the connecting rod 7. The free end of the extension rod 8 is provided with an internal thread located on its own inner wall. The number of extension rods 8 can be multiple, and each extension rod 8 is 1 meter long, which can be extended according to the length of the deep hole on the part being measured. A fixing ring 80 is circumferentially provided on the outer wall of the extension rod 8. When the extension rod 8 is added, the overall length of the measuring device increases, and the fixing ring 80 can provide support for the entire measuring device.

[0048] During use, the extension rod 8 is threadedly connected to the connecting rod 7, extending the overall length of the measuring device, facilitating the measurement of the inner diameter of deeper holes in components. Since multiple extension rods 8 are provided, the overall length of the measuring device can be increased by adding more extension rods 8. Adjacent extension rods 8 are connected by threading, with the internal threads of one extension rod 8 connecting to the external threads of the next extension rod 8, thereby increasing the overall length of the measuring device.

[0049] It is worth noting that when the measuring device is located inside the deep hole of the part, if the measuring device is to be lengthened by connecting the extension rod 8 to achieve the measurement of the inner diameter of the deeper hole of the part, it is necessary to open a through groove on the side wall of the extension rod 8, and the through groove is opened on the side wall of the extension rod 8 along the central axis direction of the extension rod 8, so as to facilitate the placement of the cable 40 wire into the interior of the extension rod 8, thereby avoiding the cable 40 wire being squeezed and damaged during the measurement process, thereby affecting the measurement of the inner diameter of the deep hole of the part.

[0050] Further, such as Figure 1 and Figure 2 As shown, a curved sliding block 24 is provided on the end of the measuring block that contacts the part.

[0051] The arc-surface slider 24 is arranged at the end where the measuring shaft 23 contacts the inner wall of the part in the deep hole. The outer diameter of the arc-surface slider 24 is smaller than the outer diameter of the measuring shaft 23, and the arc surface on the arc-surface slider 24 is arranged toward the side of the part, thereby enhancing the mobility between the measuring shaft 23 and the inner wall of the part in the deep hole.

[0052] When in use, the measuring shaft 23 contacts the inner wall of the deep hole of the part through the arc-surface slider 24 at the end, thereby improving the mobility of the measuring shaft 23 on the inner wall of the deep hole of the part and avoiding movement jamming.

[0053] Further, such as Figure 2 As shown, the first guide ring 5 and the second guide ring 6 are both provided with a third through hole 60 .

[0054] There are multiple third through holes 60 , which are respectively opened along the circumferential direction on the first guide ring 5 with the central axis of the first mounting cylinder 2 as the center, and on the second guide ring 6 with the central axis of the connecting cylinder 1 as the center.

[0055] When in use, the plurality of third through holes 60 provided on the first guide ring 5 and the second guide ring 6 can reduce the weight of the entire measuring device while having a guiding function, and can also achieve the purpose of saving materials.

[0056] Further, such as Figure 1 and Figure 2 As shown, an inclined surface inclined toward the central axis of the connecting tube 1 is provided on the outer wall of the first guide ring 5 .

[0057] The inclined surface is provided on the outer wall of the first guide ring 5 , and an extension line of the inclined surface and a central axis of the first mounting tube 2 are aligned at a point.

[0058] When in use, the inclined surface on the first guide ring 5 is closer to the inside of the deep hole on the part than the measuring shaft 23, which enables the first guide ring 5 to contact the part where the inner diameter of the deep hole of the part changes before the measuring shaft 23. The setting of the inclined surface on the first guide ring 5 facilitates improving the mobility of the first mounting tube 2 in the deep hole of the part.

[0059] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. The embodiments and features of the embodiments of this application may be combined arbitrarily without conflict. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A device for measuring the inner diameter of a deep hole, characterized in that: include: A connecting cylinder, wherein both ends of the connecting cylinder are respectively connected with a first mounting cylinder and a second mounting cylinder, a first through hole is provided on the side wall of the first mounting cylinder, a guide cylinder connected with the first through hole is provided on the outer wall of the first mounting cylinder, and a second through hole is provided on the side wall of the guide cylinder; a spring sheet is provided on the outer wall of the connecting cylinder, and the free end of the spring sheet passes through the second through hole; an induction coil is provided inside the first mounting cylinder, and a connection socket electrically connected with the induction coil is provided on the free end of the second mounting cylinder; A measuring shaft, wherein the measuring shaft is slidably connected to the first mounting cylinder through the first through hole, an outer wall of the measuring shaft is fixedly connected to the spring sheet, and an opening for the measuring shaft to pass through is formed on the side wall of the induction coil; A display, the display being plugged into the connection socket via a cable; There are two guide cylinders and two measuring shafts, and there is a one-to-one correspondence between the guide cylinders and the measuring shafts. The guide cylinders are symmetrically arranged along the central axis of the first mounting cylinder.

2. The deep hole inner diameter measuring device according to claim 1, characterized in that: The inner diameter of the induction coil is equal to the outer diameter of the measuring shaft.

3. The device for measuring the inner diameter of a deep hole according to claim 2, characterized in that: A first guide ring is sleeved on the outer wall of the first mounting tube, and a nut is threadedly connected to the free end of the first mounting tube; a support ring is circumferentially provided on the outer wall of the connecting tube, and a spiral coil is threadedly connected to the outer wall of the connecting tube, and a second guide ring sleeved on the connecting tube is provided between the support ring and the spiral coil.

4. The device for measuring the inner diameter of a deep hole according to claim 3, characterized in that: A bearing is provided between the second mounting tube and the connecting tube, the bearing is sleeved on the second mounting tube, the bearing is provided with a stud sleeved on the connecting tube, a connecting rod is threadedly connected to the stud, the interior of the connecting rod is hollow, and the inner hole diameter of the connecting rod is larger than the outer diameter of the second mounting tube.

5. The device for measuring the inner diameter of a deep hole according to claim 4, characterized in that: A hollow extension rod is threadedly connected to the free end of the connecting rod.

6. The device for measuring the inner diameter of a deep hole according to claim 5, characterized in that: An end of the measuring shaft that contacts the part is provided with a curved sliding block.

7. The device for measuring the inner diameter of a deep hole according to claim 3, characterized in that: The first guide ring and the second guide ring are both provided with a third through hole.

8. The device for measuring the inner diameter of a deep hole according to claim 3, characterized in that: An inclined surface inclined toward the central axis of the connecting tube is formed on the outer wall of the first guide ring.

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