CN103557818B - A kind of probe conversion device for three coordinate measuring machine - Google Patents

Abstract

The utility model relates to a measuring head conversion device for a three-coordinate measuring machine, relating to the three-coordinate measuring machine. It is equipped with a base, a measuring head installation platform, a stepping motor, a driving shaft, a curved groove wheel mechanism driving part, a curved groove wheel mechanism follower part, a driven shaft, a bearing, a positioning mechanism and a winding ring; the base and the measuring head installation platform Fixed connection, the output shaft of the stepper motor is connected with the driving shaft, the driving shaft is set on the active part of the curved groove wheel mechanism, the driven shaft is set on the follower part of the curved groove wheel mechanism, and the upper end of the driven shaft is fixedly connected with the probe mounting platform , the bearing is set on the driven shaft, the bearing is installed on the base, the positioning mechanism is equipped with a positioning rod, 2 positioning balls and a spring, the middle part of the positioning rod is screwed with the driven shaft, the spring is set on the positioning rod, and 2 positioning The balls are respectively arranged at one end of the positioning rod, and the inner wall of the base is provided with at least 4 positioning holes, the positioning balls are embedded in the positioning holes, and the winding ring is arranged on the driven shaft. The structure is simple, the positioning is accurate, and the work efficiency can be significantly improved.

Description

A Measuring Head Conversion Device Used in Three Coordinate Measuring Machine

technical field

The invention relates to a three-coordinate measuring machine, in particular to a measuring head conversion device for a three-coordinate measuring machine.

Background technique

The three-coordinate measuring machine is a new type of high-efficiency precision measuring instrument developed in the past 30 years. It is widely used in industries such as machinery manufacturing, electronics, automobiles and aerospace. It can detect the size, shape and mutual position of parts and components, such as the measurement of space profiles such as boxes, guide rails, turbines and blades, cylinders, cams, gears, and shapes. In addition, it can also be used for scribing, centering holes, lithography integrated circuits, etc., and can scan continuous surfaces and prepare machining programs for CNC machine tools. Because of its strong versatility, large measurement range, high precision, high efficiency, good performance, and the ability to connect with flexible manufacturing systems, it has become a type of large-scale precision instrument, so it is called "measurement center". As a modern large-scale precision instrument, the three-coordinate measuring machine has increasingly shown its importance and broad development prospects (see literature: 1, Zhang Guoxiong. Three-coordinate measuring machine. Tianjin University Press, 1999.7).

Due to the different functions and application occasions of different types of probes, in practical applications, it is often necessary to replace different probes to realize the application in different occasions. The old way of changing probes is to do it manually, which is time-consuming and labor-intensive. Now this problem has attracted everyone's attention, and solutions to this problem have emerged one after another, such as the way of using a tool magazine for lathe tool replacement, but this structure is complicated and the cost is high.

Contents of the invention

The object of the present invention is to provide a three-coordinate measuring machine measuring head conversion device with simple structure, accurate positioning and significantly improved work efficiency.

The invention is provided with a base, a measuring head installation platform, a stepping motor, a driving shaft, a driving part of a curved groove wheel mechanism, a driven part of a curved groove wheel mechanism, a driven shaft, a bearing, a positioning mechanism and a winding ring;

The base is fixedly connected with the measuring head installation platform, the output shaft of the stepping motor is connected with the driving shaft, the driving shaft is set on the active part of the curved sheave mechanism, the driven shaft is set on the driven part of the curved sheave mechanism, and the upper end of the driven shaft is connected to the The measuring head mounting table is fixedly connected, the bearing is set on the driven shaft, the bearing is installed on the base, the positioning mechanism is equipped with a positioning rod, 2 positioning balls and a spring, the middle part of the positioning rod is screwed with the driven shaft, and the spring is set on the On the rod, two positioning balls are respectively arranged at one end of the positioning rod, and the inner wall of the base is provided with at least four positioning holes, the positioning balls are embedded in the positioning holes, and the winding ring is arranged on the driven shaft.

The output shaft of the stepping motor is preferably connected with the drive shaft through a coupling.

The positioning hole is preferably a conical positioning hole, and the conical positioning hole can better cooperate with the positioning ball to realize the function of accurate positioning.

Preferably, the base is provided with a lead guide port of the base, and the lead wire of the measuring head can be connected with external equipment through the lead guide port of the base.

The number of the winding rings is preferably provided with at least 4, and each winding ring is used to respectively guide the data lines of each measuring head, and the data lines of the measuring heads are guided through the winding rings, and then the bases arranged on the base The wire guide exits.

It is better to have 2 sets of positioning mechanism, each set of positioning mechanism is equipped with a positioning rod, 2 positioning balls and a spring, the middle part of the positioning rod is screwed with the driven shaft, the spring is sleeved on the positioning rod, and the 2 positioning balls are connected by a spring They are respectively arranged at one end of the positioning rod.

Working principle of the present invention and beneficial effect are as follows:

During installation, the probe is fixed on the probe installation platform through bolts, and the base is fixed on the coordinate measuring machine through bolts and nuts. When the stepper motor is ordered to rotate, it will drive the active part of the curved sheave mechanism on the driving shaft to rotate, and then drive the movement of the driven part of the curved sheave mechanism, and drive the driven part through the track set by the curved sheave The shaft and the measuring head mounting table rotate to realize the switching of different measuring head (sensor) positions. Fast switching of sensors is realized, which significantly improves work efficiency. Since the positioning rod of the positioning mechanism is fixedly connected to the driven shaft, when the driven shaft rotates, the positioning rod will also move accordingly. The positioning ball will enter the tapered hole to achieve positioning. When the circumferential force is less than the set spring support force, the ball will be fixed in the hole and will not pop out, ensuring the positioning of the mechanism; when the stepping motor is driven, the circumferential force is greater than the set When the support force of the spring is applied, the ball pops out of the taper hole and moves along the inner side of the base. The positioning mechanism can ensure accurate positioning after switching stations, and the positioning accuracy is high. The invention adopts the cooperation of a stepping motor and a curved groove wheel mechanism, has a simple structure, can realize switching of different measuring heads in a short time, and has high working efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of an embodiment of the present invention.

Fig. 2 is a schematic diagram of the internal structure of the embodiment of the present invention.

Fig. 3 is a schematic diagram of a part of the internal structure of an embodiment of the present invention.

Fig. 4 is a schematic diagram of the positioning mechanism of the embodiment of the present invention.

The marks in Figures 1 to 4 indicate:

1. Bolt, 2. First probe, 3. Second probe, 4. Bolt, 5. Probe mounting platform, 6. Base, 7. Base wire guide, 8. Third probe, 9. Bolt , 10. The fourth probe, 11. Bolt, 12. Positioning hole, 13. Probe mounting table wire guide, 14. Bolt, 15. Stepping motor, 16. Driven shaft, 17. Nut, 18. Winding Wire ring, 19. spring, 20. positioning ball, 21. positioning rod, 22. curved groove wheel mechanism follower, 23. bearing, 24. bolt, 25. elastic circlip, 26. driving shaft, 27. nut, 28. Bolt, 29. Nut, 30. Active part of curved groove wheel mechanism, 31. Set screw, 32. Nut, 33. Coupling, 34. Nut.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

Referring to Figures 1 to 4, this embodiment includes a base 6, a measuring head mounting table 5, a stepping motor 15, a driving shaft 26, an active part 30 of a curved sheave mechanism, a driven part 22 of a curved sheave mechanism, a driven shaft 16, Bearing 23, positioning mechanism and winding ring 18.

The base 6 is fixedly connected with the measuring head installation platform 5 . The output shaft of the stepping motor 15 is connected with the driving shaft 26 through a coupling 33 . The driving shaft 26 is arranged on the driving part 30 of the curved sheave mechanism, and the driven shaft 16 is arranged on the driven part 22 of the curved sheave mechanism. The upper end of the driven shaft 16 is fixedly connected with the measuring head installation platform 5, the bearing 23 is arranged on the driven shaft 16, the bearing 23 is installed on the base 6, and the positioning mechanism is provided with 2 sets, and each set of positioning mechanism is provided with a positioning rod 21, 2 A positioning ball 20 and a spring 19, the middle part of the positioning rod 21 is screwed with the driven shaft 16, the spring 19 is sleeved on the positioning rod 21, and the two positioning balls 20 are connected to one end of the positioning rod 21 by the spring 19. The inner wall of the base 6 is provided with four positioning holes 12 , and each positioning ball 20 is respectively embedded in one positioning hole 12 , and the winding ring 18 is sheathed on the driven shaft 16 .

The positioning hole 12 is a conical positioning hole, and the conical positioning hole 12 can better cooperate with the positioning ball 20 to realize the function of accurate positioning.

The base 6 is provided with a base wire guide port 7, and the number of the winding rings 18 is 4, and each winding ring 18 is used to guide the data lines of each measuring head respectively, and the data lines of each measuring head pass through the measuring head. The wire guide ports 13 of the head mounting table are respectively guided through respective winding rings 18, and then lead out from the base wire guide port 7 provided on the base 6 to connect with external equipment.

Provide the concrete installation of present embodiment and the explanation of work process below:

The first measuring head 2 , the second measuring head 3 , the third measuring head 8 and the fourth measuring head 10 are fixedly connected to the measuring head installation platform 5 by bolts 1 , 4 , 9 , 11 respectively. The bearing 23 is connected with the base 6 through bolts 24 and nuts 34 . There is an interference fit between the driven shaft 16 and the bearing 23 . The follower 22 of the curved sheave mechanism is in interference fit with the driven shaft 16 , and its axial movement is fixed by an elastic circlip 25 . The positioning rod 21 is fixed on the driven shaft 16 by thread fit, and the positioning ball 20 is fixedly connected on the spring 19 . The winding ring 18 is placed between the positioning shaft 21 and the measuring head installation platform 5 , and the winding ring 18 and the driven shaft 16 are transitionally fitted. The measuring head mounting table 5 is fastened on the driven shaft 16 by a nut 17 . The wires of different probes go around different winding rings to ensure that the wires will not be entangled with each other, and are connected to external equipment through the wire guide port 7 of the base and the wire guide port 13 of the probe mounting table.

When the stepper motor 15 receives the order to rotate, it will drive the curved sheave mechanism active part 30 on the driving shaft 26 to rotate, and then drive the movement of the curved sheave mechanism follower 22; It is interference fit with the driven shaft 16, so it will drive the rotation of the driven shaft 16; and the worktable 5 is fixedly connected with the driven shaft 16 through the nut 17, so the driven shaft 16 will drive the workbench 5 to rotate, thereby realizing different Switching of the probe (sensor) position.

The positioning rod 21 of the positioning mechanism is fixedly connected to the driven shaft 16, so when the driven shaft 16 rotates, the positioning rod 21 will also move accordingly. The positioning ball 20 will enter the positioning hole 12 to achieve positioning. When the force in the circumferential direction was less than the force of the support of the set spring 19, the positioning ball 20 would be fixed in the positioning hole 12 and would not pop out, ensuring the positioning of the positioning mechanism; when the stepping motor 15 was driven, the circumferential direction When the force is greater than the set supporting force of the spring 19 , the positioning ball 20 pops out of the positioning hole 12 and moves along the inner side of the base 6 .

The rest of the symbols that are not specifically described in each figure have been reflected in the description part of the drawings.

Claims (6)

1. A measuring head conversion device for a three-coordinate measuring machine, characterized in that it is provided with a base, a measuring head installation platform, a stepping motor, a driving shaft, a curved groove wheel mechanism active part, and a curved groove wheel mechanism follower , driven shaft, bearing, positioning mechanism and winding ring; The base is fixedly connected with the measuring head installation platform, the output shaft of the stepping motor is connected with the driving shaft, the driving shaft is set on the active part of the curved sheave mechanism, the driven shaft is set on the driven part of the curved sheave mechanism, and the upper end of the driven shaft is connected to the The measuring head mounting table is fixedly connected, the bearing is set on the driven shaft, the bearing is installed on the base, the positioning mechanism is equipped with a positioning rod, 2 positioning balls and a spring, the middle part of the positioning rod is screwed with the driven shaft, and the spring is set on the On the rod, two positioning balls are respectively arranged on one end of the positioning rod through a spring connection, and the inner wall of the base is provided with at least four positioning holes, the positioning balls are embedded in the positioning holes, and the winding ring is arranged on the driven on axis. 2. A measuring head conversion device for a three-coordinate measuring machine according to claim 1, wherein the output shaft of the stepping motor is connected to the driving shaft through a coupling. 3. A measuring head conversion device for a three-coordinate measuring machine according to claim 1, wherein the positioning hole is a conical positioning hole. 4. A measuring head conversion device for a three-coordinate measuring machine according to claim 1, wherein the base is provided with a guide port for wires. 5. A measuring head conversion device for a three-coordinate measuring machine according to claim 1, wherein the number of said winding rings is at least four. 6. A kind of measuring head conversion device for coordinate measuring machine as claimed in claim 1, it is characterized in that, described positioning mechanism is provided with 2 sets, and each set of positioning mechanism is provided with positioning bar, 2 positioning balls and spring , the middle part of the positioning rod is screwed with the driven shaft, the spring is sleeved on the positioning rod, and the two positioning balls are respectively arranged at one end of the positioning rod through a spring connection.