A gas meter case inner profile measuring device

Abstract

The application discloses a kind of gas meter shell inner contour measuring devices, belong to gas meter processing measurement technical field, the gas inlet of shell includes straight pipe and arc pipe, the side of positioning assembly is provided with measuring head, positioning pipe is connected to the one end of telescopic rod by air bag, the other end of telescopic rod is connected to the output end of telescopic device installed on workbench, and still be connected with elastic connecting component between positioning pipe and telescopic rod, the inside of positioning pipe is provided with rotary drive device, rotary drive device can drive measuring head to rotate around the axis of positioning pipe;Air bag is connected with inflator equipment by pipeline, inflator equipment is installed on workbench, and the inside of telescopic rod forms the passage of pipeline passing;Inflator equipment is used to inflate air bag, and the radian after air bag is inflated is consistent with the radian of arc pipe.The present application can drive measuring head to displace along the axis of arc pipe, to realize the measurement of the diameter of each place of arc pipe inner wall, and perfect the demand of measuring equipment.

Description

Technical Field

[0001] This invention belongs to the field of gas meter processing and measurement technology, specifically relating to a gas meter casing inner contour measuring device. Background Technology

[0002] During the manufacturing of gas meter housings, human error or equipment malfunction can cause deviations in the diameters of the inlet and outlet. These diameter errors directly affect the accuracy of the gas meter's flow rate. With the diversification of gas meter designs, existing gas meter housing inlets include curved pipes, which have a certain curvature. While some existing measuring devices can move linearly to measure the manufacturing quality of the housing along a straight line, these devices cannot measure the inner diameter error of curved pipes. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a gas meter housing inner contour measuring device, which can solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention discloses a gas meter casing inner contour measuring device, comprising a worktable, a boss disposed on the worktable, and a positioning component fixed on the boss for positioning the casing. The gas inlet of the casing includes a straight pipe and an arc-shaped pipe. A measuring head is disposed on one side of the positioning component, and the measuring head is coaxially rotatably connected to the positioning pipe. The positioning pipe is connected to one end of a telescopic rod via an air bladder, and the other end of the telescopic rod is connected to the output end of a telescopic device mounted on the worktable. An elastic connecting component is also connected between the positioning pipe and the telescopic rod. A rotation driving device is disposed on the inner side of the positioning pipe, which can drive the measuring head to rotate around the axis of the positioning pipe. The air bladder is connected to an inflation device via a pipe, and the inflation device is mounted on the worktable. The inner side of the telescopic rod forms a channel through which the pipe passes. The inflation device is used to inflate the air bladder, and the air bladder, after expansion, forms an arc consistent with the arc of the arc-shaped pipe.

[0006] Furthermore, the measuring head includes a rotating cylinder, which is rotatably mounted on the outside of the positioning tube. A hinged support and a sliding support are simultaneously mounted on the rotating cylinder. The hinged support is hinged to one end of a support rod, and the other end of the support rod extends obliquely outward and connects to a contact. The outer side of the contact contacts the inner wall of the casing. The middle part of the support rod is connected to one end of a connecting rod, and the other end of the connecting rod is hinged to a slide rod. The slide rod is slidably disposed within the sliding support, and the axis of the sliding support is parallel to the axis of the positioning tube. The slide rod is also connected to a displacement measuring assembly.

[0007] Furthermore, the displacement measuring assembly includes a limiting plate, an arc-shaped push plate, and a displacement gauge. The limiting plate is fixed on the slide rod, one end of the arc-shaped push plate is provided with a through hole that cooperates with the slide rod, and the other end of the arc-shaped push plate is connected to the displacement gauge, which is fixed on the rotating drum.

[0008] Furthermore, the contact is spherical, and the diameter of the contact is larger than the diameter of the support rod. The contact has a through hole, and the through holes of each contact are connected in series by a pull rope. The two ends of the pull rope are connected to the pull rope tightening mechanism after wrapping around the measuring head once. The pull rope mechanism is located inside the rotating drum.

[0009] Furthermore, a guide wheel support is fixed to the outer side of the rotating drum. The guide wheel support is rotatably connected to the guide wheel. A guide groove is provided on the outer side of the guide wheel to guide the pull rope.

[0010] Furthermore, the rope tightening mechanism includes a drum, a rotating shaft, and a first motor. The rotating shaft is fixed at the center of the drum and is arranged radially along the drum. The rotating shaft is rotatably engaged with the drum and is connected to the first motor, which is fixed on the outside of the drum. One end of the rope is fixedly connected to the drum, and the other end of the rope is wound around the outside of the drum.

[0011] Furthermore, the rotation drive device includes an internal gear ring, a gear, and a second motor. The internal gear ring is fixed on the inner side of the rotating drum, and the internal gear ring meshes with the gear. The gear is connected to the output end of the second motor, and the second motor is fixed on the inner side of the positioning tube.

[0012] Furthermore, a convex ring is provided on the outer side of the positioning tube, and an annular groove corresponding to the convex ring is opened on the inner side of the rotating cylinder, with the convex ring rotatably disposed in the annular groove.

[0013] Furthermore, a pin is fixed on the boss, and the boss is rotatably connected to the worktable via the pin.

[0014] Furthermore, the telescopic device includes an L-shaped slide, a threaded sleeve, a threaded rod, a motor support, a third motor, a bearing seat, and a guide rail. The guide rail is fixed on the worktable, the base plate of the L-shaped slide is slidably mounted on the guide rail, the threaded sleeve is fixed to the vertical plate of the L-shaped slide, the threaded sleeve is threadedly connected to the threaded rod, the threaded sleeve is connected to the output end of the third motor, and the threaded sleeve is also supported by the bearing seat mounted on the worktable; the telescopic rod is connected to the vertical plate of the L-shaped slide.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention discloses a gas meter casing inner contour measuring device. A rotary drive device rotates the measuring head, and simultaneously, through a telescopic device, the measuring head can measure the diameter at different locations within the gas inlet of the casing. To accommodate the curvature of the arc-shaped tube, this invention incorporates an air bladder. The air bladder is smaller than the arc-shaped tube, but both have the same curvature. The air bladder has a prefabricated structure and can inflate according to a predetermined shape. Therefore, after inflating, the air bladder can drive the measuring head to move along the axis of the arc-shaped tube, thereby achieving the measurement of the diameter at various points on the inner wall of the arc-shaped tube, thus fulfilling the requirements of the measuring equipment.

[0017] In the device disclosed in this invention, when the airbag is deflated, under the prestress of the elastic connecting component, the positioning tube can drive the measuring head to return to its original position, so as to realize the measurement of the inner diameter of the straight tube.

[0018] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0020] Figure 1 This is a schematic diagram of the measuring device of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view at point A;

[0022] Figure 3 This is a front view of the measuring device of the present invention;

[0023] Figure 4 This is a schematic diagram of the rope structure;

[0024] Figure 5 This is a schematic diagram of the rotation drive device;

[0025] Figure 6 This is a schematic diagram of the airbag during deflation.

[0026] Figure 7 This is a schematic diagram of the structure of the airbag after it has inflated.

[0027] The following components are labeled in the attached diagram: 1. Workbench; 2. Boss; 3. Case; 4. Positioning assembly; 5. Straight tube; 6. Arc-shaped tube; 7. Measuring head; 8. Positioning tube; 9. Airbag; 10. Telescopic rod; 11. Telescopic device; 12. Elastic connection assembly; 13. Pipe; 14. Inflation device; 15. Channel; 16. Rotary drum; 17. Hinge support; 18. Sliding support; 19. Support rod; 20. Contact; 21. Connecting rod; 22. Slide rod; 23. Limiting plate; 24. Arc-shaped push plate; 25. Displacement rod; 26. Through hole; 27. Pull rope; 28. Guide wheel support; 29. ​​Guide wheel; 30. Drum; 31. Rotating shaft; 32. First motor; 33. Internal gear ring; 34. Gear; 35. Second motor; 36. Convex ring; 37. Ring groove; 38. Pin shaft; 39. L-shaped slide; 40. Threaded sleeve; 41. Threaded rod; 42. Motor support; 43. Third motor; 44. Bearing seat; 45. Guide rail. Detailed Implementation

[0028] like Figures 1 to 7 As shown, this invention discloses a gas meter casing inner contour measuring device, including a worktable 1, a boss 2 disposed on the worktable 1, and a positioning component 4 fixed on the boss 2 for positioning the casing 3. The worktable 1 is square, and its upper surface is horizontal. The positioning component 4 is used to position the gas meter casing 3, ensuring that the axis of the gas meter casing 3 is located in a horizontal plane. All of the above belong to the prior art, and those skilled in the art will understand.

[0029] The air inlet of the housing 3 includes a straight pipe 5 and an arc-shaped pipe 6. The straight pipe 5 is located at the outer end of the arc-shaped pipe 6, and the airflow reaches the arc-shaped pipe 6 after passing through the straight pipe 5. A measuring head 7 is provided on one side of the positioning component 4. The measuring head 7 can be an existing measuring device, such as a dial indicator. Furthermore, in this embodiment, the measuring head 7 is coaxially rotatably connected to the positioning pipe 8. The measuring head 7 is located outside the positioning pipe 8, and the measuring head 7 can rotate around the axis of the positioning pipe 8.

[0030] Specifically, the inner end of the positioning tube 8 is connected to one end of the telescopic rod 10 via an airbag 9. The airbag 9 is sealed, so after inflation, it can move the positioning tube 8 connected to it. The airbag 9 is connected to an inflation device 14 via a pipe 13, which is used to inflate or deflate the airbag 9. The other end of the telescopic rod 10 is connected to the output end of the telescopic device 11 installed on the workbench 1. The telescopic device 11 can move the telescopic rod 10, causing it to move axially closer to or away from the gas meter housing 3.

[0031] Furthermore, an elastic connecting component 12 is connected between the positioning tube 8 and the telescopic rod 10. When the airbag 9 is deflated, under the prestress of the elastic connecting component 12, the positioning tube 8 can drive the measuring head 7 to return to its original position, thereby realizing the measurement of the inner diameter of the straight pipe 5. A rotation drive device is provided on the inner side of the positioning tube 8. The rotation drive device can drive the measuring head 7 to rotate around the axis of the positioning tube 8, so as to realize the measurement of different positions around the gas meter housing 3 on the same cross section. The inflation device 14 disclosed in this invention is installed on the workbench 1. The inner side of the telescopic rod 10 forms a channel 15 through which the pipe 13 passes, which can facilitate the movement of the pipe. The inflation device 14 is used to inflate the airbag 9. After the airbag 9 is inflated, it forms an arc that matches the arc of the arc-shaped pipe 6. After the airbag 9 is inflated, it can drive the measuring head 7 to move along the axis of the arc-shaped pipe 6, thereby realizing the measurement of the diameter at various points on the inner wall of the arc-shaped pipe 6, thus improving the requirements of the measuring device.

[0032] In this embodiment, the measuring head 7 includes a rotating cylinder 16, which is rotatably mounted on the outside of the positioning tube 8. The rotating cylinder 16 is coaxially arranged with the positioning tube 8. A hinged support 17 and a sliding support 18 are simultaneously mounted on the rotating cylinder 16. The hinged support 17 is located at the end of the rotating cylinder 16 away from the telescopic rod 10. The hinged support 17 is hinged to one end of the support rod 19. The other end of the support rod 19 extends outward at an angle and connects to the contact 20. The angle is also towards the side where the telescopic rod 10 is located, which facilitates the insertion of the contact 20. The outer side of the contact 20 contacts the inner wall of the housing 3. The middle part of the support rod 19 is connected to one end of the connecting rod 21. The other end of the connecting rod 21 is hinged to the slide rod 22. The slide rod 22 is slidably disposed in the sliding support 18. The axis of the sliding support 18 is parallel to the axis of the positioning tube 8. The slide rod 22 is also connected to the displacement measuring assembly. When measuring the diameter of the dial case 3, the inner wall of the dial case 3 acts on the contact 20, causing the support rod 19 to deflect around the hinge of the hinge support 17. After the support rod 19 deflects, it acts on the slide rod 22 through the connecting rod 21, allowing the slide rod 22 to move axially. After the slide rod 22 moves axially, it acts on the displacement measuring component, which can display the displacement value of the contact 20, facilitating diameter measurement. By adopting the above device, the structure can be compacted, which not only facilitates the insertion of the device into dial cases 3 with different pipe diameters, but also facilitates the installation and reading of the displacement measuring component. Under the action of the rotation drive device, it is convenient to measure the diameter in the entire circumference.

[0033] In this embodiment, the displacement measuring assembly includes a limiting plate 23, an arc-shaped push plate 24, and a displacement meter 25. The limiting plate 23 is fixed to the slide rod 22. One end of the arc-shaped push plate 24 is provided with a through hole 26 that mates with the slide rod 22, and the other end of the arc-shaped push plate 24 is connected to the displacement meter 25. The displacement meter 25 is fixed to the rotating cylinder 16. When the slide rod 22 is displaced, the limiting plate 23 on the slide rod 22 can push the arc-shaped push plate 24 along the axis, and the arc-shaped push plate 24 can drive the measuring end of the displacement meter 25 to move, so as to realize the measurement. The displacement meter 25 of the present invention adopts the prior art and is equipped with a return spring, which can restore the contact 20 to its original position when the contact 20 is not in action, so as to facilitate the next measurement.

[0034] In this embodiment, the contact 20 is spherical, and its diameter is larger than that of the support rod 19. A through hole 26 is provided on the contact 20. The through holes 26 of each contact 20 are connected in series by a pull rope 27. Both ends of the pull rope 27 are connected to a pull rope 27 tightening mechanism after wrapping around the measuring head 7. The pull rope 27 mechanism is located inside the rotating drum 16. When the pull rope 27 tightening mechanism is activated, the annularly arranged pull rope 27 can be tightened. After the pull rope 27 is tightened circumferentially, each contact 20 can be retracted inward, bringing the contact 20 as close as possible to the surface of the rotating drum 16. By using the above device, it is convenient to pull out the measuring head 7 after the measurement is completed, reducing the possibility of wear after the contact 20 comes into contact with the tube wall.

[0035] In this embodiment, a guide wheel support 28 is fixed on the outer side of the rotating drum 16. The guide wheel support 28 is rotatably connected to the guide wheel 29. A guide groove is provided on the outer side of the guide wheel 29. The guide groove is used to guide the pull rope 27, making it easier to tighten or loosen the pull rope 27.

[0036] In this embodiment, the tightening mechanism for the pull rope 27 includes a drum 30, a rotating shaft 31, and a first motor 32. The rotating shaft 31 is fixed at the center of the drum 30 and is arranged radially along the drum 16. The rotating shaft 31 is rotatably engaged with the drum 16 and is connected to the first motor 32, which is fixed to the outside of the drum 16. One end of the pull rope 27 is fixedly connected to the drum 30, and the other end of the drum 30 is wound around its outside. After the first motor 32 is started, it can drive the drum 30 to rotate, which can wind the pull rope 27, thereby tightening the pull rope 27. Of course, the rotating shaft 31 can also be connected to the drum 16 via a return torsion spring, which allows the drum 30 to be easily reset after the measuring head 7 is pulled out.

[0037] In this embodiment, the rotation drive device includes an internal gear ring 33, a gear 34, and a second motor 35. The internal gear ring 33 is fixed to the inner side of the rotating drum 16 and meshes with the gear 34. The gear 34 is connected to the output end of the second motor 35, which is fixed to the inner side of the positioning tube 8. By adopting the above device, not only are external support rods 19 and other equipment avoided, but the structure is also compacted. The entire device is simple and effective, avoiding interference between cables and equipment.

[0038] In this embodiment, a convex ring 36 is provided on the outer side of the positioning tube 8, and an annular groove 37 corresponding to the convex ring 36 is provided on the inner side of the rotating cylinder 16. The convex ring 36 is rotatably disposed in the annular groove 37 and is axially limited. A pin 38 is fixed on the boss 2, and the boss 2 is rotatably connected to the worktable 1 through the pin 38. After the measurement of the air inlet is completed, the boss 2 can be rotated 90° to facilitate the measurement of the air outlet. By adopting the above method, the re-clamping of the case 3 can be avoided, the repeated calibration process can be reduced, and the measurement efficiency can be improved.

[0039] In this embodiment, the telescopic device 11 includes an L-shaped slide 39, a threaded sleeve 40, a threaded rod 41, a motor support 42, a third motor 43, a bearing seat 44, and a guide rail 45. The guide rail 45 is fixed on the workbench 1. The bottom plate of the L-shaped slide 39 is slidably disposed on the guide rail 45. The threaded sleeve 40 is fixed on the vertical plate of the L-shaped slide 39. The threaded sleeve 40 is threadedly connected to the threaded rod 41. The threaded sleeve 40 is connected to the output end of the third motor 43. The threaded sleeve 40 is also supported by the bearing seat 44 installed on the workbench 1. The telescopic rod 10 is connected to the vertical plate of the L-shaped slide 39.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. 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 detail without departing from the scope defined by the claims of the present invention.

Claims

1. A gas meter housing inner contour measuring device, comprising a worktable (1), a boss (2) disposed on the worktable (1), and a positioning component (4) fixed on the boss (2) for positioning the meter housing (3), wherein the gas inlet of the meter housing (3) comprises a straight pipe (5) and an arc-shaped pipe (6), characterized in that: A measuring head (7) is provided on one side of the positioning component (4). The measuring head (7) is coaxially rotatably connected to a positioning tube (8). The positioning tube (8) is connected to one end of a telescopic rod (10) via an airbag (9). The other end of the telescopic rod (10) is connected to the output end of a telescopic device (11) installed on the workbench (1). An elastic connecting component (12) is also connected between the positioning tube (8) and the telescopic rod (10). A rotation drive device is provided on the inner side of the positioning tube (8). The rotation drive device can drive the measuring head (4). 7) Rotate around the axis of the positioning tube (8); the airbag (9) is connected to an inflation device (14) through a pipe (13), the inflation device (14) is installed on the workbench (1), and the inner side of the telescopic rod (10) forms a channel (15) through which the pipe (13) passes; the inflation device (14) is used to inflate the airbag (9), and the airbag (9) forms an arc that matches the arc of the arc tube (6) after expansion; the measuring head (7) includes a rotating cylinder (16), which is rotatably installed on the positioning tube (8). On the outside of the rotating cylinder (16), a hinged support (17) and a sliding support (18) are installed simultaneously. The hinged support (17) is hinged to one end of the support rod (19). The other end of the support rod (19) extends outward at an angle and connects to the contact (20). The outer side of the contact (20) contacts the inner wall of the case (3). The middle part of the support rod (19) is connected to one end of the connecting rod (21). The other end of the connecting rod (21) is hinged to the slide rod (22). The slide rod (22) is slidably mounted on the sliding support (18). Inside the slide support (18), the axis of the sliding support (18) is parallel to the axis of the positioning tube (8); the slide rod (22) is connected to the displacement measuring component; the displacement measuring component includes a limiting plate (23), an arc-shaped push plate (24) and a displacement meter (25). The limiting plate (23) is fixed on the slide rod (22). One end of the arc-shaped push plate (24) is provided with a through hole (26) that cooperates with the slide rod (22). The other end of the arc-shaped push plate (24) is connected to the displacement meter (25). The displacement meter (25) is fixed on the rotating drum (16).

2. The gas meter housing inner contour measuring device according to claim 1, characterized in that: The contact (20) is spherical and its diameter is larger than that of the support rod (19). The contact (20) has a through hole (26). The through holes (26) of each contact (20) are connected in series by a pull rope (27). The two ends of the pull rope (27) are connected to the pull rope (27) tightening mechanism after wrapping around the measuring head (7) once. The pull rope (27) mechanism is located inside the rotating drum (16).

3. The gas meter housing inner contour measuring device according to claim 2, characterized in that: The outer side of the rotating drum (16) is fixed with a guide wheel support (28), which is rotatably connected to the guide wheel (29). The outer side of the guide wheel (29) is provided with a guide groove, which is used to guide the pull rope (27).

4. The gas meter housing inner contour measuring device according to claim 2, characterized in that: The rope (27) tightening mechanism includes a drum (30), a rotating shaft (31), and a first motor (32). The rotating shaft (31) is fixed at the center of the drum (30). The rotating shaft (31) is arranged radially along the drum (16). The rotating shaft (31) is rotatably engaged with the drum (16). The rotating shaft (31) is connected to the first motor (32). The first motor (32) is fixed on the outside of the drum (16). One end of the rope (27) is fixedly connected to the drum (30), and the other end of the drum (30) is wound around the outside of the drum (30).

5. A gas meter housing inner contour measuring device according to any one of claims 2-4, characterized in that: The rotation drive device includes an internal gear ring (33), a gear (34), and a second motor (35). The internal gear ring (33) is fixed on the inner side of the rotating drum (16). The internal gear ring (33) meshes with the gear (34). The gear (34) is connected to the output end of the second motor (35). The second motor (35) is fixed on the inner side of the positioning tube (8).

6. The gas meter housing inner contour measuring device according to claim 5, characterized in that: The outer side of the positioning tube (8) is provided with a convex ring (36), and the inner side of the rotating cylinder (16) is provided with an annular groove (37) corresponding to the convex ring (36). The convex ring (36) is rotatably disposed in the annular groove (37).

7. A gas meter housing inner contour measuring device according to any one of claims 2-4, characterized in that: A pin (38) is fixed on the boss (2), and the boss (2) is rotatably connected to the worktable (1) through the pin (38).

8. A gas meter housing inner contour measuring device according to any one of claims 2-4, characterized in that: The telescopic device (11) includes an L-shaped slide (39), a threaded sleeve (40), a threaded rod (41), a motor support (42), a third motor (43), a bearing seat (44), and a guide rail (45). The guide rail (45) is fixed on the workbench (1). The bottom plate of the L-shaped slide (39) is slidably mounted on the guide rail (45). The vertical plate of the L-shaped slide (39) is fixed with a threaded sleeve (40). The threaded sleeve (40) is threadedly connected to the threaded rod (41). The threaded sleeve (40) is connected to the output end of the third motor (43). The threaded sleeve (40) is also supported by the bearing seat (44) installed on the workbench (1). The telescopic rod (10) is connected to the vertical plate of the L-shaped slide (39).

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