Roundness measuring walking trolley

Abstract

The utility model discloses a roundness measurement walking trolley, including bottom plate, rotary motor and test subassembly, the bottom of bottom plate is equipped with gyro wheel, the output shaft of rotary motor is with the coaxial of the pipe of being measured, and test subassembly includes connecting rod, sleeve pipe and test head, and the output shaft of rotary motor is fixed perpendicularly to connecting rod, and one end of sleeve pipe is connected with connecting rod, and the other end is connected with test head, and connecting rod and sleeve pipe are telescopic cooperation, when test head is pressed, sleeve pipe contracts to connecting rod direction, when pressure is relieved, sleeve pipe can reset. The utility model discloses the roundness measurement walking trolley can walk in the pipe, completes the independent measurement of the pipe inner circle, and the telescopic design of sleeve pipe can make test head close to the inner wall of pipe, and guarantee the smooth rotation of test subassembly, and the test precision is high, and the working strength of staff is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting measurement technology, and in particular to a roundness measurement trolley. Background Technology

[0002] For tubular products with high requirements for cylindrical roundness, a roundness measuring device is needed to check whether the surface roundness meets the standard. Existing roundness measuring devices are mainly used to measure the outer circular surface of the product. The device itself is fixed, and the laser detector measures the entire circle of the outer circular surface by rotating the product. However, such devices cannot be used to measure the roundness of the inner circular surface of large-sized products, such as a launch tube. Due to its large inner diameter, the inner circular surface is formed by a stretching process. After forming, the roundness of the inner circular surface needs to be checked. Existing technology requires manual hand-held device insertion into the tube for measurement, which has problems such as low measurement accuracy, high labor intensity, and low safety. Utility Model Content

[0003] To address the technical problems of existing roundness measuring devices being used only for testing the outer circular surface of products, while the inner circular surface can only be measured manually, resulting in low measurement accuracy, high workload, and low safety, this utility model provides a roundness measuring trolley to solve the above problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a roundness measuring trolley, including a base plate, a rotary motor and a testing assembly, wherein the bottom of the base plate is provided with rollers; the output shaft of the rotary motor is coaxial with the round tube to be tested; the testing assembly includes a connecting rod, a sleeve and a testing head, wherein the connecting rod is fixed perpendicularly to the output shaft of the rotary motor, one end of the sleeve is connected to the connecting rod and the other end is connected to the testing head, and the connecting rod and the sleeve are telescopically compatible. When the testing head is subjected to pressure, the sleeve retracts towards the connecting rod, and when the pressure is released, the sleeve can return to its original position.

[0005] In an optional embodiment of this utility model, a spring is provided inside the sleeve, and one end of the spring abuts against the connecting rod.

[0006] In an optional embodiment of this utility model, the side of the sleeve is provided with a sliding groove, and the connecting rod is provided with a sliding pin that passes through the sliding groove.

[0007] In an optional embodiment of this utility model, the test head has a spherical structure, and the test head is connected to the sleeve through a ball-head sleeve connector.

[0008] In an optional embodiment of this utility model, an electric push rod is installed on the base plate. The extension and retraction direction of the electric push rod is perpendicular to the output shaft of the rotary motor. The electric push rod is connected to the adapter plate. The rotary motor is installed on the adapter plate, and the output shaft of the rotary motor passes through the adapter plate and is connected to the connecting rod.

[0009] In an optional embodiment of this utility model, at least two guide shafts are fixed on the base plate, the guide shafts are parallel to the extension and retraction direction of the electric push rod, and the adapter plate is slidably engaged with the guide shafts.

[0010] In an optional embodiment of this utility model, the rollers are symmetrical on both sides of the base plate, and the output shaft of the rotary motor is located at the center of symmetry of the rollers.

[0011] In an optional embodiment of this utility model, a wheel seat is fixed below the base plate, and the roller is rotatably connected to the wheel seat via a wheel axle.

[0012] In an optional embodiment of this utility model, the central axis of the wheel axle is inclined to the surface of the base plate so that the rollers on both sides of the base plate are arranged in a figure-eight shape.

[0013] The beneficial effects of this utility model are: (1) The roundness measuring trolley described in this utility model can travel inside the pipe and complete the autonomous measurement of the inner circular surface of the pipe. The telescopic design of the sleeve can make the test head fit tightly against the inner wall of the circular pipe and ensure the smooth rotation of the test components. The test accuracy is high and the workload of the staff is greatly reduced.

[0014] (2) The height of the rotation center of the test component can be adjusted by an electric push rod, making it suitable for measuring round tubes of different sizes.

[0015] (3) The present invention increases the contact area between the roller and the inner wall of the circular tube by tilting the roller, thereby improving the straightness of the traveling trolley. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a perspective view of a specific embodiment of the roundness measuring trolley described in this utility model; Figure 2 This is a front view of a specific embodiment of the roundness measuring trolley described in this utility model; Figure 3 This is a right view of a specific embodiment of the roundness measuring trolley described in this utility model; Figure 4 yes Figure 3 A sectional view along line AA.

[0018] In the diagram, 1. Base plate, 2. Adapter plate, 3. Rotary motor, 4. Test assembly, 401. Connecting rod, 402. Sleeve, 403. Test head, 404. Spring, 405. Ball head sleeve connector, 5. Roller, 6. Output shaft, 7. Slide groove, 8. Sliding pin, 9. Electric push rod, 10. Guide shaft, 11. Wheel seat, 12. Wheel axle, 13. Control box. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] Example 1 like Figures 1-4 As shown, a roundness measuring trolley includes a base plate 1, a rotary motor 3, and a testing assembly 4. The bottom of the base plate 1 is equipped with rollers 5 to facilitate the movement of the trolley inside the tube. The output shaft 6 of the rotary motor 3 is coaxial with the round tube to be tested. The testing assembly 4 includes a connecting rod 401, a sleeve 402, and a testing head 403. The connecting rod 401 is fixed perpendicularly to the output shaft 6 of the rotary motor 3. One end of the sleeve 402 is connected to the connecting rod 401, and the other end is connected to the testing head 403. The connecting rod 401 and the sleeve 402 are telescopically compatible. When the testing head 403 is subjected to pressure, the sleeve 402 retracts towards the connecting rod 401. When the pressure is released, the sleeve 402 can return to its original position.

[0021] The rollers 5 of the traveling trolley can be driven by electricity or pulled by the staff from the outside. Since the output shaft 6 of the rotary motor 3 is coaxial with the tube under test, the test component 4 can rotate around the center of the tube under test when the rotary motor 3 is started, no matter where the traveling trolley is inside the tube under test.

[0022] The telescopic movement of the sleeve 402 and the connecting rod 401 is to ensure that the test head 403 rolls smoothly along the surface of the tube to be tested. Under normal conditions, the distance from the test head 403 to the center of rotation is slightly larger than the inner diameter of the tube to be tested. When the traveling trolley enters the tube to be tested, the sleeve 402 retracts towards the connecting rod 401, so that the test head 403 just touches the tube to be tested.

[0023] Connection method between sleeve 402 and connecting rod 401: A spring 404 is installed inside the sleeve 402, and one end of the spring 404 abuts against the connecting rod 401, such as Figure 4As shown, the upper end of the spring 404 is fixed, and the lower end abuts against the connecting rod 401. The spring 404 is used to keep the sleeve 402 and the connecting rod 401 in a taut state. When the test head 403 at the upper end is subjected to pressure, the sleeve 402 slides relative to the connecting rod 401.

[0024] To prevent relative rotation between the sleeve 402 and the connecting rod 401 and to make the structure more stable, in a further design, the sleeve 402 is provided with a sliding groove 7 on its side, and the connecting rod 401 is provided with a sliding pin 8 that passes through the sliding groove 7. The sliding pin 8 can realize the circumferential limitation of the sleeve 402 and the connecting rod 401, and the length of the sliding groove 7 can also serve as the limit of the sliding stroke of the sleeve 402.

[0025] To reduce friction between the test head 403 and the tube under test, in a preferred embodiment, the test head 403 has a spherical structure, and the test head 403 is connected to the sleeve 402 via a ball-head sleeve connector 405. Figure 4 As shown, the ball head sleeve connector 405 is a tubular structure with threads at both ends.

[0026] Roller 5: The rollers 5 are symmetrical on both sides of the base plate 1. To ensure that the output shaft 6 of the rotary motor 3 is always located at the center of the tube under test when the trolley is at any position inside the tube under test, the output shaft 6 of the rotary motor 3 needs to be located at the center of symmetry of the rollers 5. A wheel seat 11 is fixed below the base plate 1. The rollers 5 are rotatably connected to the wheel seat 11 through the wheel axle 12. The rollers 5 can only roll along the direction perpendicular to the wheel axle 12, so that the trolley can move as straight as possible inside the tube under test.

[0027] The test head 403 can be a laser detector. During the test, a laser tracker is placed outside one end of the tube to be tested. The trolley is moved to a certain test position and then stopped. The rotary motor 3 is started to make the test head 403 rotate along the inner wall of the tube to be tested. The laser tracker traces the rotation trajectory and calculates the roundness of the inner wall of the tube to be tested at that position. Then the trolley is moved to the next test position and the same method is used to continue the measurement.

[0028] An automatic braking device can also be installed on roller 5 to ensure stability during testing.

[0029] Example 2 Based on Embodiment 1, an electric push rod 9 is installed on the base plate 1. The extension and retraction direction of the electric push rod 9 is perpendicular to the output shaft 6 of the rotary motor 3. The electric push rod 9 is connected to the adapter plate 2. The rotary motor 3 is installed on the adapter plate 2, and the output shaft 6 of the rotary motor 3 passes through the adapter plate 2 and is connected to the connecting rod 401.

[0030] In this embodiment, the height of the output shaft 6 of the rotary motor 3 can be adjusted according to the inner diameter of the tube to be tested, so that the output shaft 6 of the rotary motor 3 is located at the center of the tube to be tested.

[0031] In a further design, at least two guide shafts 10 are fixed on the base plate 1. The guide shafts 10 are parallel to the extension and retraction direction of the electric push rod 9, and the adapter plate 2 is slidably engaged with the guide shafts 10. The guide shafts 10 provide stable support and guidance for the adapter plate 2, preventing the adapter plate 2 from shaking and causing a decrease in test accuracy.

[0032] Example 3 Based on the above embodiments, such as Figure 1 and Figure 3 As shown, the central axis of the axle 12 is inclined to the surface of the base plate 1, so that the rollers 5 on both sides of the base plate 1 are arranged in a V-shape. Since the inner surface of the tube to be tested is arc-shaped, if the axle 12 is parallel to the surface of the base plate 1, the rollers 5 will travel along the horizontal plane. The contact surface between the traveling surface of the rollers 5 and the tube to be tested is small, which can easily lead to slippage. In this embodiment, by tilting the rollers 5, the traveling surface of the rollers 5 is made to fully contact the inner surface of the tube to be tested. When the rollers 5 are in contact with the tube to be tested, the trolley can travel in a straight line along the contact surface.

[0033] This utility model can also install a control box 13 on the base plate 1, place the controller and battery in the control box 13, and directly connect it to the rotary motor 3, electric push rod 9 and test head 403.

[0034] In the description of this utility model, it should be understood that the terms "center", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A roundness measuring trolley, characterized in that, include: The base plate has rollers at its bottom. A rotary motor, the output shaft of which is coaxial with the circular tube to be measured; The test assembly includes a connecting rod, a sleeve, and a test head. The connecting rod is fixed perpendicularly to the output shaft of the rotary motor. One end of the sleeve is connected to the connecting rod, and the other end is connected to the test head. The connecting rod and the sleeve are telescopically compatible. When the test head is subjected to pressure, the sleeve retracts towards the connecting rod. When the pressure is released, the sleeve can return to its original position.

2. The roundness measuring trolley according to claim 1, characterized in that: A spring is installed inside the sleeve, and one end of the spring abuts against the connecting rod.

3. The roundness measuring trolley according to claim 2, characterized in that: The sleeve has a sliding groove on its side, and the connecting rod has a sliding pin that passes through the sliding groove.

4. The roundness measuring trolley according to claim 1, characterized in that: The test head has a spherical structure and is connected to the sleeve through a ball-head sleeve connector.

5. The roundness measuring trolley according to claim 1, characterized in that: An electric push rod is installed on the base plate. The extension and retraction direction of the electric push rod is perpendicular to the output shaft of the rotary motor. The electric push rod is connected to the adapter plate. The rotary motor is installed on the adapter plate, and the output shaft of the rotary motor passes through the adapter plate and is connected to the connecting rod.

6. The roundness measuring trolley according to claim 5, characterized in that: At least two guide shafts are fixed on the base plate. The guide shafts are parallel to the extension and retraction direction of the electric push rod, and the adapter plate is slidably engaged with the guide shafts.

7. The roundness measuring trolley according to claim 1, characterized in that: The rollers are symmetrical on both sides of the base plate, and the output shaft of the rotary motor is located at the center of symmetry of the rollers.

8. The roundness measuring trolley according to claim 1, characterized in that: A wheel seat is fixed below the base plate, and the roller is rotatably connected to the wheel seat via an axle.

9. The roundness measuring trolley according to claim 8, characterized in that: The central axis of the wheel axle is inclined to the surface of the base plate so that the rollers on both sides of the base plate are arranged in a figure-eight shape.

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