Articulated arm coordinate measuring machine

Abstract

The application belongs to the technical field of measuring machines, and particularly relates to a joint arm coordinate measuring machine. In view of the problem that the existing joint arm coordinate measuring machine is prone to causing poor measurement accuracy, the following scheme is proposed. The joint arm coordinate measuring machine comprises a base, a circular pipe rotatably installed on the base, a horizontal groove formed in the base, and an extension mechanism arranged in the horizontal groove. The extension mechanism comprises a double-shaft motor, two extension screws fixedly installed on an output shaft of the double-shaft motor, two extension seats threadedly connected to the two extension screws, two first wheel frames arranged on the two extension seats, four first rollers arranged on the four first wheel frames, two support foot plates rotatably installed on the two extension seats, two torque springs arranged on the two support foot plates, and two baffle plates arranged on one side of the two support foot plates. The joint arm coordinate measuring machine can stably measure, can avoid that the arm span is too heavy to cause the gravity center to deviate, has high stability, can ensure that the measurement accuracy is higher, is simple to use, and is convenient to operate.

Description

Technical Field

[0001] This invention relates to the field of measuring machine technology, and more particularly to an articulated arm coordinate measuring machine. Background Technology

[0002] There is a demand for high-precision position measurement of points on the surface of objects and high-precision measurement of the geometric dimensions of objects in many technical fields. Especially for the manufacturing industry, product measurement and quality control are crucial. For these fields, there are many measuring devices developed for these applications, commonly known as coordinate measuring machines (CMMs). Compared with traditional orthogonal coordinate system CMMs, CMMs have a spatial serial structure, thus offering advantages such as greater freedom, a wider measurement space, relatively flexible and convenient operation, and suitability for on-site measurement. The patent announcement number CN210220890U discloses a glove-type articulated arm CMM, including a fixed base. A rotating base is located on one side of the top of the fixed base, and a first articulated arm is pinned to one side of the outer end of the rotating base. A cylinder is fixedly installed on the top of the rotating base near the first articulated arm, and the rotating base is connected to the first articulated arm through the cylinder. However, this device cannot effectively adjust the distance and has poor stability, easily swaying due to the weight of the robotic arm, causing the measuring machine to operate unbalanced, thus resulting in decreased measurement accuracy. Therefore, we propose an articulated arm CMM. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies that easily lead to decreased measurement accuracy, and to propose an articulated arm coordinate measuring machine.

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

[0005] A coordinate measuring machine for an articulated arm includes a base on which a circular tube is rotatably mounted. A transverse groove is cut into the base, and an extension mechanism is disposed within the groove. The extension mechanism includes a dual-axis motor, with two extension screws fixedly mounted on the output shaft of the dual-axis motor. Each extension screw is threadedly connected to an extension seat. Each extension seat has two first wheel frames, and each of the four first wheel frames has a first roller. Each extension seat has rotatably mounted support feet, and each support foot has a torque spring. A baffle is provided on one side of each support foot. A first motor is installed inside the circular tube. A column is fixedly installed on the circular tube and is fixedly connected to the output shaft of the first motor. A vertical groove is opened inside the column, and a second motor is installed inside the vertical groove. A lifting screw is fixedly installed on the output shaft of the second motor. A lifting plate is threadedly connected to the lifting screw. The lifting plate is slidably connected to the inner wall of the vertical groove. A first rotary seat is fixedly installed on the lifting plate. A receiving box is rotatably installed on the first rotary seat. A first rotating shaft motor is installed on the receiving box. A third motor is installed inside the receiving box. A push screw is fixedly installed on the machine, and a first arm plate is threadedly connected to the push screw. An auxiliary support mechanism is provided on the column, the auxiliary support mechanism including a telescopic rod, which is rotatably connected to the first arm plate. A connecting plate is fixedly installed on the column, and a support leg is slidably installed on the connecting plate. A wheel seat is rotatably installed on the support leg, and a second wheel frame is fixedly installed on the wheel seat. A second roller is provided on the second wheel frame. A second rotary seat is provided on the first arm plate, and a second rotating shaft motor is provided on the second rotary seat. The second arm plate is fixedly installed on the output shaft of the second rotating shaft motor. The second arm plate is rotatably connected to the second rotary seat. A third rotary seat is provided on the second arm plate. A third rotary motor is provided on the third rotary seat. An angle box is fixedly installed on the output shaft of the third rotary motor. A clamping mechanism is provided on the angle box. The clamping mechanism includes a fourth motor. A motor compartment is opened inside the angle box. The fourth motor is fixedly connected to the inner wall of the motor compartment. A clamping seat is fixedly installed on the output shaft of the fourth motor. A bidirectional screw is rotatably installed inside the clamping seat. A handle is fixedly installed on the bidirectional screw. Two clamping plates are threadedly connected to the bidirectional screw. The two clamping plates cooperate with each other.

[0006] Preferably, the clamping seat is provided with a slide rail, and both clamping plates are slidably connected to the slide rail.

[0007] Preferably, the support leg is provided with a square groove, which is slidably connected to the connecting plate.

[0008] Preferably, the base is provided with a circular rail, which is slidably connected to the circular tube.

[0009] Preferably, the corner box is provided with an annular rail, which is slidably connected to the clamping seat.

[0010] Preferably, a vertical rail is provided in the vertical groove, and the vertical rail is slidably connected to the lifting plate.

[0011] Preferably, two horizontal rails are provided in the horizontal groove, and the two horizontal rails are slidably connected to two extension seats.

[0012] The beneficial effects of the articulated arm coordinate measuring machine of the present invention are as follows: the extension mechanism can increase the effective support area of ​​the base and increase stability; the cooperation of the second motor, the lifting screw and the lifting plate can adjust the height and facilitate coordinate measurement; the cooperation of the third motor, the push screw and the first arm plate can extend the detection distance and improve the applicability of the measuring machine; the auxiliary support mechanism can move with the movement of the first arm plate to avoid the articulated arm being too heavy when extended, causing the center of gravity to shift and resulting in measurement errors; the clamping mechanism can stably clamp the detector and facilitate maintenance measurement.

[0013] This invention provides stable measurement, avoids center of gravity shift caused by excessive arm length, and has high stability, thus ensuring higher measurement accuracy. It is also simple to use and easy to operate. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the base of an articulated arm coordinate measuring machine proposed in this invention;

[0015] Figure 2 This is a cross-sectional structural schematic diagram of an articulated arm coordinate measuring machine proposed in this invention;

[0016] Figure 3 This invention proposes a coordinate measuring machine for an articulated arm. Figure 2 A magnified structural diagram of part A in the middle;

[0017] Figure 4 This invention proposes a coordinate measuring machine for an articulated arm. Figure 2 A magnified structural diagram of part B in the middle section;

[0018] Figure 5 This invention proposes a coordinate measuring machine for an articulated arm. Figure 2 A partial top-view structural diagram.

[0019] In the diagram: 1. Base; 2. Round tube; 3. Horizontal slot; 4. Dual-axis motor; 5. Extension screw; 6. Extension seat; 7. First wheel frame; 8. First roller; 9. First motor; 10. Column; 11. Vertical slot; 12. Second motor; 13. Lifting screw; 14. Lifting plate; 15. First rotating seat; 16. Receiving box; 17. First rotating shaft motor; 18. Third motor; 19. Push screw; 20. First arm plate; 21. Telescopic rod ; 22. Connecting plate; 23. Support leg; 24. Wheel seat; 25. Second wheel frame; 26. Second roller; 27. Second rotary seat; 28. Second rotating shaft motor; 29. ​​Second arm plate; 30. Third rotary seat; 31. Third rotating shaft motor; 32. Angle box; 33. Motor compartment; 34. Fourth motor; 35. Clamping seat; 36. Handle; 37. Two-way screw; 38. Clamping plate; 39. Support foot plate; 40. Torque spring; 41. Baffle. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Example 1

[0022] Reference Figure 1-5 A coordinate measuring machine for articulated arms includes a base 1, on which a circular tube 2 is rotatably mounted. A horizontal groove 3 is cut into the base 1, and an extension mechanism is disposed within the horizontal groove 3. A first motor 9 is disposed within the circular tube 2. A column 10 is fixedly mounted on the circular tube 2 and is fixedly connected to the output shaft of the first motor 9. A vertical groove 11 is cut into the column 10, and a second motor 12 is disposed within the vertical groove 11. A lifting screw 13 is fixedly mounted on the output shaft of the second motor 12. A lifting plate 14 is threadedly connected to the lifting screw 13 and is slidably connected to the inner wall of the vertical groove 11. A first rotating seat 15 is fixedly mounted on the lifting plate 14, and a receiving box 16 is rotatably mounted on the first rotating seat 15. The receiving box 16 is provided with... There is a first rotating shaft motor 17, a third motor 18 is installed in the receiving box 16, a push screw 19 is fixedly installed on the third motor 18, a first arm plate 20 is threadedly connected to the push screw 19, an auxiliary support mechanism is installed on the column 10, a second rotating seat 27 is installed on the first arm plate 20, a second rotating shaft motor 28 is installed on the second rotating seat 27, a second arm plate 29 is fixedly installed on the output shaft of the second rotating shaft motor 28, the second arm plate 29 is rotatably connected to the second rotating seat 27, a third rotating seat 30 is installed on the second arm plate 29, a third rotating shaft motor 31 is installed on the third rotating seat 30, a corner box 32 is fixedly installed on the output shaft of the third rotating shaft motor 31, and a clamping mechanism is installed on the corner box 32.

[0023] Reference Figure 2-3The extension mechanism includes a dual-axis motor 4, on which two extension screws 5 are fixedly mounted. Each of the two extension screws 5 is threadedly connected to an extension seat 6. Each of the two extension seats 6 is provided with two first wheel frames 7. Each of the four first wheel frames 7 is provided with a first roller 8. Each of the two extension seats 6 is rotatably mounted with a support foot plate 39. Each of the two support foot plates 39 is provided with a torque spring 40. Each of the two support foot plates 39 has a baffle 41 on one side.

[0024] Reference Figure 2 The auxiliary support mechanism includes a telescopic rod 21, which is rotatably connected to the first arm plate 20. A connecting plate 22 is fixedly installed on the column 10. A support leg 23 is slidably installed on the connecting plate 22. A wheel seat 24 is rotatably installed on the support leg 23. A second wheel frame 25 is fixedly installed on the wheel seat 24. A second roller 26 is provided on the second wheel frame 25.

[0025] Reference Figure 4 The clamping mechanism includes a fourth motor 34. A motor compartment 33 is provided inside the corner box 32. The fourth motor 34 is fixedly connected to the inner wall of the motor compartment 33. A clamping seat 35 is fixedly installed on the output shaft of the fourth motor 34. A bidirectional screw 37 is rotatably installed inside the clamping seat 35. A handle 36 is fixedly installed on the bidirectional screw 37. Two clamping plates 38 are threadedly connected to the bidirectional screw 37, and the two clamping plates 38 cooperate with each other.

[0026] Reference Figure 2 Two horizontal rails are provided in the horizontal groove 3. The two horizontal rails are slidably connected to the two extension seats 6. The two horizontal rails enable the two extension seats 6 to slide in a fixed position without rotating.

[0027] Reference Figure 2 A vertical rail is provided inside the vertical groove 11. The vertical rail is slidably connected to the lifting plate 14. The vertical rail enables the lifting plate 14 to rise and fall in a fixed position without rotating.

[0028] Reference Figure 1 The base 1 is equipped with a circular rail, which is slidably connected to the circular tube 2. The circular rail allows the circular tube 2 to rotate in a fixed position, thereby ensuring the stable rotation of the column 10.

[0029] Reference Figure 4 The clamping base 35 is equipped with a slide rail, and both clamping plates 38 are slidably connected to the slide rail. The slide rail allows the two clamping plates 38 to slide in a fixed position for easy clamping.

[0030] Reference Figure 2 The support leg 23 is provided with a square groove, which is slidably connected to the connecting plate 22. The square groove allows the support leg 23 to slide on the connecting plate 22 without detaching.

[0031] Reference Figure 4An annular rail is provided on the corner box 32, and the annular rail is slidably connected to the clamping seat 35. The annular rail enables the clamping seat 35 to rotate stably on the corner box 32, which facilitates measurement.

[0032] In this embodiment, during use, the probe is placed between the two clamping plates 38, and the handle 36 is rotated, which in turn drives the bidirectional screw 37 to rotate. The rotation of the bidirectional screw 37 causes the two clamping plates 38 to move closer together and clamp the probe, facilitating measurement. The dual-axis motor 4 can be started, which drives the two extension screws 5 to rotate. The rotation of the two extension screws 5 causes the two extension seats 6 to slide, facilitating support for the measuring machine. The size can be adjusted according to specific needs. When the two extension seats 6 slide outward, the two support feet 39 slide out of the transverse groove 3. Under the elastic force of the torque spring 40, the two support feet 39 rotate to the vertical direction and, with the cooperation of the baffle 41, are stably supported on the extension seats 6, increasing stability. This can be achieved by the first motor 9. Rotating the column allows the measuring machine to rotate as a whole. When lifting or lowering is required, the second motor 12 can be activated, which in turn drives the lifting screw 13 to rotate, allowing the lifting plate 14 to rise or fall, thus improving its applicability. Similarly, the third motor 18 can be activated, which drives the push screw 19 to rotate, which in turn causes the first arm plate 20 to slide and extend, further increasing its applicability. With the cooperation of the telescopic rod 21, the first arm plate 20 slides, which in turn moves the support leg 23 for convenient support and increased stability. Similarly, the arm plates of the measuring machine can be adjusted by the first rotating shaft motor 17, the second rotating shaft motor 28, and the third rotating shaft motor 31, respectively, to facilitate measurement. The rotation of the fourth motor 34 can drive the probe head to rotate and measure the object to be measured in different positions.

[0033] Example 2

[0034] The difference between this embodiment and embodiment one is that: a controller and an emergency stop button are provided on the base 1, and multiple sensors are provided on the clamping seat 35. The emergency stop button and multiple sensors are electrically connected to the controller. When the measuring machine moves, if the sensor detects that the probe head is close to the object on the side, it sends a signal to the controller. The controller controls the emergency stop button to start, shutting down the measuring machine to avoid collision and damage to the measuring machine, thereby improving safety.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coordinate measuring machine for articulated arms, comprising a base (1), characterized in that, A circular tube (2) is rotatably mounted on the base (1). A horizontal groove (3) is cut into the base (1). An extension mechanism is provided in the horizontal groove (3). A first motor (9) is provided in the circular tube (2). A column (10) is fixedly mounted on the circular tube (2). The column (10) is fixedly connected to the output shaft of the first motor (9). A vertical groove (11) is cut into the column (10). A second motor (12) is provided in the vertical groove (11). A lifting screw (13) is fixedly mounted on the output shaft of the second motor (12). A lifting plate (14) is threaded onto the lifting screw (13). The lifting plate (14) is slidably connected to the inner wall of the vertical groove (11). A first rotating seat (15) is fixedly mounted on the lifting plate (14). A receiving box (16) is rotatably mounted on the first rotating seat (15). A first rotating seat (16) is provided on the receiving box (16). A rotating shaft motor (17) is provided. A third motor (18) is provided in the receiving box (16). A push screw (19) is fixedly installed on the third motor (18). A first arm plate (20) is threadedly connected to the push screw (19). An auxiliary support mechanism is provided on the column (10). A second rotating seat (27) is provided on the first arm plate (20). A second rotating shaft motor (28) is provided on the second rotating seat (27). A second arm plate (29) is fixedly installed on the output shaft of the second rotating shaft motor (28). The second arm plate (29) is rotatably connected to the second rotating seat (27). A third rotating seat (30) is provided on the second arm plate (29). A third rotating shaft motor (31) is provided on the third rotating seat (30). A corner box (32) is fixedly installed on the output shaft of the third rotating shaft motor (31). A clamping mechanism is provided on the corner box (32). The extension mechanism includes a dual-axis motor (4), on which two extension screws (5) are fixedly installed. Each of the two extension screws (5) is threadedly connected to an extension seat (6). Each of the two extension seats (6) is provided with two first wheel frames (7). Each of the four first wheel frames (7) is provided with a first roller (8). Each of the two extension seats (6) is rotatably mounted with a support foot plate (39). Each of the two support foot plates (39) is provided with a torque spring (40). Each of the two support foot plates (39) is provided with a baffle (41) on one side. The auxiliary support mechanism includes a telescopic rod (21), which is rotatably connected to the first arm plate (20). A connecting plate (22) is fixedly installed on the column (10), a support leg (23) is slidably installed on the connecting plate (22), a wheel seat (24) is rotatably installed on the support leg (23), a second wheel frame (25) is fixedly installed on the wheel seat (24), and a second roller (26) is provided on the second wheel frame (25).

2. The articulated arm coordinate measuring machine according to claim 1, characterized in that, The clamping mechanism includes a fourth motor (34), a motor compartment (33) is provided inside the corner box (32), the fourth motor (34) is fixedly connected to the inner wall of the motor compartment (33), a clamping seat (35) is fixedly installed on the output shaft of the fourth motor (34), a bidirectional screw (37) is rotatably installed inside the clamping seat (35), a handle (36) is fixedly installed on the bidirectional screw (37), and two clamping plates (38) are threadedly connected to the bidirectional screw (37), and the two clamping plates (38) cooperate with each other.

3. The articulated arm coordinate measuring machine according to claim 1, characterized in that, Two horizontal rails are provided in the horizontal groove (3), and the two horizontal rails are slidably connected to two extension seats (6).

4. The articulated arm coordinate measuring machine according to claim 1, characterized in that, A vertical rail is provided inside the vertical groove (11), and the vertical rail is slidably connected to the lifting plate (14).

5. The articulated arm coordinate measuring machine according to claim 1, characterized in that, The base (1) is provided with a circular rail, which is slidably connected to the circular tube (2).

6. The articulated arm coordinate measuring machine according to claim 2, characterized in that, The clamping seat (35) is provided with a slide rail, and both clamping plates (38) are slidably connected to the slide rail.

7. The articulated arm coordinate measuring machine according to claim 1, characterized in that, The support leg (23) is provided with a square groove, which is slidably connected to the connecting plate (22).

8. The articulated arm coordinate measuring machine according to claim 2, characterized in that, The corner box (32) is provided with a ring rail, which is slidably connected to the clamping seat (35).

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