The lifting platform of the economical CNC lifting table milling machine is driven by a stepping motor. Since the stepping motor does not have a brake device, in the power failure state, the lifting platform will automatically move down due to its own weight, so it is necessary to use the lifting platform balancing mechanism for control. . This paper proposes a new type of lifting platform balancing mechanism. The design of the vertical self-locking mechanism has the characteristics of simple structure, low cost, high precision and easy assembly.
1. Traditional lifting platform balancing mechanism
As shown in Fig. 1, the drive motor 1 transmits the motion to the shaft II by the timing pulleys 2, 3, and the right-end bevel gear 4 of the shaft II drives the large bevel gear 7 to rotate the ball screw III, and the lifting platform rises or falls. The right end of the figure is the balance mechanism, which consists of an overrunning clutch and a self-locking device. The working principle is that the lead screw drives the star wheel 15 of the one-way overrunning clutch through the bevel gear 8 and the shaft IV. When the elevator is raised, the star wheel 15 turns to disengage the roller 17 from the outer ring 11 of the overrunning clutch. The outer ring 11 does not rotate with the star wheel 15, and the self-locking device does not function. When the lifting platform is lowered, the star wheel 15 is turned to wedge the roller 17 between the star wheel 15 and the outer ring 11, so that the outer ring 11 rotates together with the shaft IV, and the outer ring 11 and the friction rings 10 and 12 which are fixed at both ends The relative movement is formed, and under the action of the disc spring 13, a frictional force is generated, the lowering resistance of the lifting platform is increased, and the self-locking action is exerted. Rotating the nut 14 changes the amount of friction.
This conventional mechanism has the following problems: 1 The power and locking mechanism is divided into two parts. There are two holes that are perpendicular to each other and have high positional requirements. The structure is complicated and the processing is difficult. 2 There are gear gaps in the pair of bevel gear pairs, and the transmission precision is low. 3 There are more than 20 kinds of parts, and the production cost is high.
figure 1
1. Motor 2, 3. Timing pulley 4, 7, 8. Bevel gear 5. Bearing block 6. Bearing 9. Shaft 10, 12. Friction ring 11. Outer ring 13. Disc spring 14. Nut 15. Star wheel 16, 18. Screws 17. Rollers 19. Sleeve
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