JPS6128684Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a grinding wheel exchange device for a centerless grinding machine, and in particular to a device that vertically rotates a horizontal grinding wheel shaft removed from the grinding machine body in order to exchange the grinding wheel. .

The double-sided cartridge type grindstone shaft of a centerless grinding machine (hereinafter simply referred to as the double-sided type grindstone shaft) weighs approximately 400 to 800 kg, and the work of replacing the grindstone is as follows:
The grinding wheel shaft is first removed from the grinding machine body, rotated from a horizontal state to a vertical state, and then the grinding wheel is removed and replaced. Conventionally, this method requires manpower and time, and it also requires a lot of effort between the spindle body, which is a precision instrument, and the operator's time. Considerable effort was required to obtain sufficient guarantees in terms of safety. In other words, although double-sided grinding wheel shafts are highly desirable for centerless grinding machines in terms of rigidity and precision, one of the reasons why they are relatively rarely adopted in small and medium-sized machines is that the grinding wheel replacement process is difficult. However, compared to the cantilever type, it has the above-mentioned problems. Further, grindstone changing devices with double-sided grindstone shafts aimed at solving these problems can also be found in conventional commercially available products. but,
These conventional devices have the following drawbacks.

(1) The device is large and heavy and has poor mobility. Therefore, in reality, no equipment was used, and the work of replacing the grindstone was often done manually.

(2) When replacing the whetstone As shown in Figure 1 A and B, use a chain block or the like to change the whetstone from a horizontal position to a vertical position and from a vertical position to a horizontal position. Locations are limited.

In Fig. 1, b is the grindstone, c is the fixed side grindstone shaft support arm, d is the swinging side grindstone shaft support arm, e is the presser cover attached to the swing side support arm,
f is the hook connected to the chain block, g is the hanging skin, h is the grindstone exchange device body, 1 is the caster,
j is stoppa.

This invention was developed in view of the above-mentioned drawbacks of the conventional technology, and the structure of this invention will be described below with reference to a specific embodiment shown in FIGS. 2 and 3.

In the drawing, handle 2 and worm 2 are attached to shaft 1.
4 is fixed, and this shaft 1 is supported by bearings 23 and 25. The worm 24 is engaged with a worm wheel 7, and the worm wheel 7 is fixed to the pivot shaft 4 by a key 3, and the pivot shaft 4 is supported by the leg 9 via a gunmetal bearing 29. One base of a substantially U-shaped grindstone shaft support arm 22 is fixed to the end of the pivot shaft 4 by a key 5, and the other base of the grindstone shaft support arm 22 is also fixed to the opposite pivot shaft 17 by a pin 16. fixed, and this pivot axis 17
is also supported by the other leg 15 via a gunmetal bearing 18. The bearings 23 and 25 are connected to the housing 30
The housing 30 is fixed to the leg 9 with bolts 31. gunmetal bearing 18,
29 are press-fitted into the legs 9 and 15, respectively. One end of the double-sided type grindstone shaft 11 is fixed by a clamping bolt 21 between the grindstone shaft support arm 22 and the presser cover 20. The double-sided grindstone shaft 11 is supported by the grindstone shaft support arm 22.
So that the double-sided grindstone shaft 11 is stable when placed on the
There is a support 14 for supporting the other end of the grindstone shaft 11. Presser cover 20 and support 1 of grindstone shaft support arm 22
A rubber sheet is glued to 4 to prevent the double-sided grindstone shaft 11 from being scratched. Also, at the bottom of the main body,
Four casters 26, 26, for convenient movement.
27, 27 are attached, two of which are swing type casters 27, 27. A handle 13 is attached to the rear of the main body for when it is moved, and a box 1 for storing tools is attached below the handle.
2 is attached.

With the above structure, the device of the present invention operates as follows. That is, when the double-sided grindstone shaft 11 is fixed horizontally by the presser cover 20, bolt 21, and support 14 of the grindstone shaft support arm 22, when the handle 2 is rotated to the right when viewed from above, the shaft The worm wheel 7 is rotated counterclockwise in the drawing by the worm 24, which is fixed to the worm 24, with a reduction ratio that produces a self-locking effect.
The grindstone shaft support arm 22 is rotated from this worm wheel 7 through the shaft 4, and the double-sided grindstone shaft 1
1 stands upright. In this state, the whetstone is removed from the whetstone shaft 11, a new whetstone is attached, and the double-sided whetstone shaft 11 with the new whetstone attached is turned until it becomes horizontal by turning the handle 2 to the left. In this case, since there is a self-locking effect by the worm 24 and the worm wheel 7, the grindstone shaft support arm 22 will not rotate naturally even if the handle 2 is stopped midway. In addition, since the center of gravity of the double-sided grindstone shaft 11 and the rotational position of the grindstone shaft support arm 22 almost match, the worm 24 and the worm wheel 7
No excessive force is applied to the teeth, and the handle 2 can be turned smoothly with a small torque.

As explained above, this device is used in a centerless grinding machine with a double-sided grinding wheel shaft, and the grinding wheel is replaced by rotating the horizontal grinding wheel shaft removed from the grinding machine body into a vertical position. A pair of legs are erected on both sides of a horizontal whetstone shaft on a movable main body equipped with casters etc. at the bottom, and a pair of legs extending from the legs in the axial direction of the whetstone shaft is approximately the axial length of the whetstone shaft. A support that supports one end of the whetstone shaft in a horizontal state is erected at a distance of half a distance, and a horizontal support that is perpendicular to the whetstone shaft in a horizontal state and passes through the center of gravity of the whetstone shaft in an approximately horizontal state is attached to this pair of legs. A substantially U-shaped grindstone shaft that rotatably supports a pair of turning shafts on a line, has a rotation radius of approximately half the shaft length of the grindstone shaft, and extends in a direction opposite to the support. The base of the support arm is fixed, the other end of the grindstone shaft is held between the tip of this approximately U-shaped grindstone shaft support arm and the presser cover, and the worm wheel is fixed to one of the pair of rotating shafts. The worm that engages with this worm wheel is rotatably supported on one of the legs via a shaft with an operating handle, so when replacing the grinding wheel, simply rotating the operating handle will keep the grinding wheel shaft in a horizontal position. In particular, the above-mentioned rotation operation force can be made to rotate from a small position to a vertical position by using a worm reduction mechanism consisting of a worm with a large reduction ratio and a worm wheel. The heavy grindstone shaft can be rotated easily as described above,
Furthermore, since the worm reduction mechanism itself has a self-locking action called a worm lock, it is possible to perform the above-mentioned rotational operation of a heavy grinding wheel shaft extremely safely. By locating the rotation center of the rotation operation on the center of gravity of the whetstone shaft, the rotational balance of the whetstone shaft is kept constant, making it possible to perform stable rotation operation and minimizing the operating force. It has the advantage that no unreasonable force is applied to the worm and worm wheel, significantly reducing wear, etc. Also, the radius of rotation can be made smaller, the whole can be made smaller and more compact, and a chain block etc. can be used as before. A single worker can easily and safely replace the grinding wheel on a centerless grinding machine with this type of double-sided grinding wheel shaft, without having to move the main body, making it easy to transport. It is convenient and can be easily transported to places where space is limited.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a grinding wheel changing state using a conventional chain block type grinding wheel changing device, Fig. 2 is a plan view of the device according to this invention, Fig. 3 is a front view of the device according to this invention, and Fig. 4 is a sectional view taken along the line in FIG. 2; 1...axis, 2...handle, 3...key, 4...
...Axis, 5...Key, 7...Worm wheel, 9
... Legs, 11 ... Double-sided grindstone shaft, 12 ... Box,
13...handle, 14...support, 15...leg,
16...Pin, 17...Shaft, 18...Gunmetal bearing,
20... Holder lid, 21... Bolt, 22... Grindstone shaft support arm, 23... Bearing, 24... Worm, 25... Bearing, 26, 27... Caster,
29...Gunmetal bearing, 30...Housing, 31...
…bolt.

Claims (1)

[Scope of utility model registration request] This device is used in centerless grinding machines with a double-sided grinding wheel shaft, and is used to replace the grinding wheel by rotating the horizontal grinding wheel shaft removed from the grinding machine body into a vertical position, and is equipped with casters, etc. at the bottom. A pair of legs are erected on both sides of a horizontal grinding wheel shaft on a movable main body, and one end of the grinding wheel shaft is spaced apart from the legs by a distance of approximately half the shaft length in the axial direction of the grinding wheel shaft. A support is erected to horizontally support the
A pair of rotating shafts are rotatably supported on the pair of legs on a horizontal line that is perpendicular to the horizontal grinding wheel shaft and passing through the center of gravity of the substantially horizontal grinding wheel shaft, and the grinding wheel is mounted on the pair of rotating shafts. The base of a substantially U-shaped grindstone shaft support arm having a rotation radius approximately half of the shaft length and extending in the opposite direction to the support is fixed, and the tip of this substantially U-shaped grindstone shaft support arm and A worm wheel is fixed to one of the pair of rotating shafts, and a worm that engages with the worm wheel is connected to one of the legs through a shaft with an operating handle. A grindstone exchange device for a centerless grinding machine, characterized in that a grindstone is rotatably supported on a shaft.