JPH0639879Y2 - Surface plate turning mechanism in valve seat lapping machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a surface plate turning mechanism in a wrapping machine for a sluice valve, and more particularly, to enable eccentric motion by making the rotation of the surface plate a single axis configuration. The above-mentioned surface plate is pressed against the valve seat surface with uniform surface pressure during polishing, which can significantly improve the sliding accuracy and at the same time reduce the size and weight of the entire mechanism. This is a technical feature.

[Conventional technology and its problems]

In the conventional lapping machine of this kind of lapping machine, in order to eccentrically rotate the lapping plate, the arm itself supporting the lapping plate is swung, or the rotating shaft of the lapping plate has an inner-outer two-axis structure. However, it was inevitable that multiple drive motors were required, the mechanism was complicated, and the size and weight of the device were inevitable, and the surface plate was pressed against the valve seat surface accurately. In this case, it was difficult to obtain the evenness of the surface pressure, and there was a problem that the sliding precision was insufficient.

[Means for solving problems]

Therefore, the present invention, at the lower end of the reducer connected to the motor,
A gear box with a built-in planetary gear mechanism driven by a drive shaft can be attached and detached, and a surface plate attached to one end of the main spindle of the planetary gear mechanism can be rotated to rotate on the other hand, while the main spindle, gear box and fixed gear can be rotated. The angle between the board and the drive shaft is set in advance to 90 ° + α (tilt angle of the valve seat), and at least these can be inserted into the valve box. It has been resolved.

[Action]

The present invention exerts a special action of performing polishing in a state in which the surface plate which is eccentrically moved by the main shaft is uniformly pressed against the valve seat surface.

〔Example〕

The structure will be described in more detail below with reference to an embodiment shown in the drawings. In the drawing, 1 is a partition box having a valve seat 1'having an inclination angle (α), and 2 is a planetary gear described below. A gear box having a built-in mechanism, or 3 is a surface plate having a main shaft 4 of the planetary gear mechanism attached to one end portion which penetrates the gear box 2, and which rotates by the action of the planetary gear mechanism. It is a circular motion.

Further, 5 is a speed reducer for the motor (M), which is detachably fixed to the lower end of the sleeve 5'at the lower end of the machine casing so as to detachably attach the upper end of the gear box 2 to the inside of the sleeve 5 '. The drive shaft 6 drives the planetary gear mechanism on the gearbox side.

Thus, in the mechanism of the present invention, the angle formed by the drive shaft 6 and the main shaft 4, the gear box 2 and the surface plate 3 is set in advance.
While setting to 90 ° + α, it is a requirement that at least the gear box 2 in the configuration of each of the above-mentioned parts is sized so that it can be inserted into the valve box together with the surface plate 3.

Next, the planetary gear mechanism will be described in detail. As shown in FIG. 2, the drive shaft 6 in which one of the pair of carriers 7 and 8 connected at a constant interval meshes with each other. Bevel gear 6'at the bottom
7'to rotate through both carriers 7
One or a plurality of planetary gears 9 are rotatably supported between the eight gears 8, and the planetary gears 9 are meshed with internal teeth 10 'of a ring gear 10 provided surrounding the other carrier 8 and This is an eccentric type planetary gear mechanism in which the main shaft 4 is eccentrically passed through both carriers 7 and 8 and a gear 4'fixed on the support shaft is meshed with the planetary gear 9. In other words, the center of rotation of the main shaft 4 and the center of rotation of the gear 4'are deviated by a certain amount from the center of rotation of the planetary gear 9 and the center of rotation of the ring gear 10 which are concentric with each other. Is.

Therefore, according to the planetary gear mechanism, the bevel gears 6'and 7'are driven by first driving the drive shaft 6.
Rotates, and the planetary gear 9 between the carriers 7 and 8 moves around the main shaft 4 and meshes with the internal teeth 10 'of the ring gear 10 to rotate about its own axis. Accordingly, the gear meshing with the planetary gear 9 is accompanied. The spindle 4 rotates through 4'and simultaneously performs a circular motion (revolution) of a fixed trajectory. As a result, the eccentric polishing motion of the surface plate 3 can be obtained.

In this case, by making the ratio of the number of revolutions of the main spindle 3 to the number of revolutions a non-integer, the tool locus during the sliding machining can be changed infinitely.

The means for pressing the platen 3 into and out of contact with the valve seat 1'is not particularly limited. For example, the one shown in FIG. 1 is a lever attached to the tip of the piston 11 'of the air cylinder 11. The rod 12 allows the casing of the speed reducer to be pushed.

For sluice valves having valve seats with different inclination angles,
Remove the gear box 2 from the lower end of the speed reducer 5,
This is to be replaced with a separate surface plate turning unit of the present invention, which has been specially prepared in advance.

[Effect of device]

As described above, the surface plate turning mechanism in the valve seat lapping machine of the present invention is one in which the surface plate can be directly rotated by a single drive source, and the rotation and rotation of the surface plate can be obtained by one axis. It is greatly simplified and can be inserted into the valve box together with the surface plate at the time of work.Compared with the one that could not be placed outside the valve box except the surface plate as before. The size and weight of the wrapping machine as a whole can be significantly reduced, which is especially effective for work in tight spaces.

Further, in the proposed mechanism, the platen is attached to the drive shaft in advance in accordance with the inclination angle of the valve seat,
Compared to the conventional universal joints and angle adjustment type, it is possible to perform polishing with the contact pressure with the valve seat surface being even at all parts, which makes it possible to perform extremely efficient and highly accurate sliding. Have an advantage.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state of use of a valve seat lapping machine equipped with a platen turning mechanism of the present invention, and FIG. 2 is a partial cross-sectional view showing an enlarged interior of a gear box of the present mechanism. In the figure, 1 ... Valve box, 2 ... Gear box, 3 ... Surface plate, 4 ... Spindle, 5 ... Reducer, 6 ... Drive shaft, 7.8 ... Carrier, 9 ... Planet Gear, 10 ... Ringi gear.

Claims (1)

[Scope of utility model registration request] 1. A rotation center of a ring gear 10 in which a gear box 2 is detachably connected to a lower end of a drive shaft of a speed reducer 5 connected to a motor (M), and a planet gear 9 is inscribed in the gear box 2. On the other hand, an eccentric type planetary gear mechanism provided by displacing the center of rotation of the main shaft 4 and its gear 4'is built in, and the surface plate 3 attached to one end of the main shaft 4 of the planetary gear mechanism is rotated.ゝ While allowing rotation,
A platen turning mechanism in a valve seat lapping machine, wherein an angle formed by the drive shaft 6 and the main shaft 4, the gear box 2, the platen 3 and the drive shaft 6 is set in advance.