JPH0144298Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device that can easily replace the grinding wheel when it is necessary to handle various types of machining with an NC grinder.

Conventional technology Generally, the grinding wheel flange is attached to the grinding wheel shaft with a taper and is tightened with screws, so in order to replace the grinding wheel, it is necessary to loosen the nut and remove the grip on the tapered part, and the grinding wheel is quite heavy. Therefore, they are handled carefully using jib cranes, etc.

Problems to be Solved by the Invention For this reason, special setups and cranes were required to remove the grindstone, which was a time-consuming and labor-intensive task that required skill.

Means for Solving the Problems A first arm 11 that has a fulcrum at the upper rear side of the grindstone cover and pivots on a horizontal plane, a hook 14 that stops the first arm 11 from pivoting, and a tip of the first arm 11. The second arm 16 rotates in a vertical plane around a spindle directly above the grinding wheel, and the second arm 16 is connected to the first arm.
a pin 17 aligned with the arm 11 and held horizontally;
Two engaging arms 20 are provided at positions 180 degrees apart, each provided with a key portion 20b that engages with the engaging crest 4c of the grinding wheel flange 4, which is provided on the same axis as the center line of the grinding wheel at the tip of the second arm 16. It is equipped with a detachable holder and a push bolt 19 which is screwed into the center of the detachable holder and presses the cap nut 6 of the grindstone shaft 2. Further, if necessary, a stopper bar 21 for preventing the engagement arm 20 from coming off is removed and provided on the holder.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. The grinding wheel head of a well-known grinding machine includes a grinding wheel head 3 rotatably supporting a grinding wheel shaft 2 having a grinding wheel 1 fixed to its tip.
The grinding wheel 1 is held by a grinding wheel flange 4, the tapered hole of the grinding wheel flange 4 is fitted into the tapered end of the grinding wheel shaft 2, and a cap nut is screwed into the thread at the shaft end via a U-shaped washer 5. 6 are fitted concentrically. A whetstone cover 7 that exposes the front side of the whetstone 1 is attached to the side of the whetstone head.
The outer cover 7a of this grindstone cover 7 is opened outward by upper and lower hinges 8 on the rear side when the grindstone is replaced, and the front upper cover 7b is opened upward about the horizontal axis when the grindstone is replaced. A support shaft 9 is fixed to the rear upper part of the grindstone cover 7 by a bracket 10, and a hole in the rear end boss portion of the first arm 11 is inserted into the support shaft 9, so that the first arm 11 can rotate within a horizontal plane. A pin 12 is installed vertically downward on a plate 11a that extends horizontally from the upper surface of the arm, and a horizontal pin 12 that is supported by a pin 13 that is installed vertically on the upper surface of the whetstone cover 7. Hook 14
is engaged to hold the first arm 11 in a position parallel to the front cover 7a of the grindstone cover 7, thereby preventing inadvertent rotation. A grindstone 1 is attached to the tip of the first arm 11.
A horizontal support shaft 15 located directly above the center is protruded, and one end of a second arm 16 is pivotally supported on this. In order to hold the second arm 16 horizontally alongside the first arm 11, a pin 17 is inserted into the middle of the second arm 16 at a position on the back surface of the hook 14 so as to be movable in the axial direction. When inserted into the hole, it also extends to the back surface of the hook 14 to prevent and lock the hook 14 from rotating. Second
A hole 16a is bored at a position that is co-centered with the center of the grindstone 1 when the arm 16 hangs vertically, and a grindstone removal holder is removably fitted into this hole 16a. The removal holder is a flange cylinder 18
A push bolt 19 is screwed through the center of the boss part, an annular groove 18c is cut on the outer periphery of the boss part, and two engaging arms 20 are provided in the flange part at 180° symmetrical positions to protrude in the axial direction. There is. A key portion 20b is formed by cutting a square groove 20a in the direction perpendicular to the axis on the opposing inner sides of the ends of the two engaging arms 20 at positions of the same length. Grindstone flange 4 that this key part 20b engages with
On the side, as shown in FIGS. 5 and 7, a key portion 20b of the engaging arm 20 and a square groove 20a are formed on the outer edge of the front end surface at 180° symmetrical positions.
A recess 4a is cut to a depth into which the recess 4a is inserted.
Subsequently, a groove 4b into which the key portion 20b can be inserted is cut along the outer edge, leaving a peak portion 4c that engages with the square groove 20a. Therefore, the removal holder is attached to the hole 16a of the second arm 16 and the key part 20 of the engagement arm 20 is attached.
b is inserted into the groove 4a of the whetstone flange 4, and when the holder or the whetstone 1 is rotated, the ridge 4 on the flange side
c enters the square groove 20a of the engaging arm 20 and the key part 20
b engages. Also, the flange tube 1 of the removable holder
A long stopper rod 21 is provided on the flange portion of No. 8 so as to be slidable in the axial direction next to the engagement arm 20 located at the upper side, and protrudes toward the front side from the arcuate window 16b of the second arm 16 and serves as a tip knob. This allows the insertion and removal holder to be pivoted. The stopper rod 21 has circumferential grooves 21a, 21 at two positions in the axial direction.
A ball 23 is inserted into the flange portion of the flange tube 18 and is biased by a spring 22, and when the knob of the stopper rod 21 is pulled, the ball 23 is inserted into the circumferential groove 21b. When pushed in, it is inserted into the circumferential groove 21a, and at this time, the tip of the stopper rod 21 is inserted into the recess 4a of the grindstone flange 4, restricting the rotation of the removal holder, and the engaging arm 20 is inserted into the crest 4c of the grindstone flange 4. I'm trying to keep it from coming off. The removable holder is normally removed from the second arm 16 when the grindstone 1 is not replaced, and when installed, it can be moved forward and backward from the side of the tip of the second arm 16 toward the hole 16a, and is stroked by the pin 25. The tip of the knob 24, which has a limited diameter, is engaged with and fixed in the circumferential groove 18a of the boss portion of the flange cylinder 18.

Function The first arm 11 is locked by the hook 14 and is located parallel to the cover 7a on the outer surface of the whetstone cover 7, and the second arm 16 has a pin 17 inserted therein to be held horizontally, and the second arm 16 is held horizontally by the removal holder. is in a removed state. When replacing the whetstone, remove the clamp on the outer cover 7a, open it around the hinge 8, retract the front upper cover 7b upwards, and replace the whetstone 1.
After exposing the cap nut 6, loosen the cap nut 6 with a wrench and remove the U-shaped nut from the side. Remove the pin 17, hang the second arm 16, and attach the hook 1.
4 and leave the first arm 11 half open to open the hole 16.
Place the stopper rod 21 in the pulled out position and attach the boss part of the flange tube 18 of the removal holder to the window 1.
The knob portion of the stopper rod 21 is inserted through the hole 6b, and the knob 24 is inserted into the circumferential groove 18a and stopped. Then, the whetstone 1 is turned by hand to a position where the recess 4a of the whetstone flange 4 and the engaging arm 20 are opposed to each other, and the first arm 11
is rotated to a position parallel to the grindstone cover 4, and the distal end key portion 20b of the engaging arm 20 is inserted into the recess 4a.
Then, remove the stopper bar 21, turn the holder, and insert the square groove 20a of the engaging arm 20 into the ridge 4c of the grindstone flange 4.
Then, the key portion 20b is engaged with the groove 4b. Next, the center push bolt 19 is screwed in and its tip presses the bearing surface of the cap nut 6 of the grinding wheel shaft 2 with strong force. This operation loosens the taper of the grinding wheel flange 4 and the grinding wheel shaft 2, and when the fit is loosened, the first
When the arm 11 is slowly rotated, the grindstone 1 is held by the two engaging arms 20 and pulled out. The pulled out grindstone 1 is placed in a predetermined position, the flange of the grindstone to be replaced is held in the removal holder, and the first
Turn the arm 11 toward the grindstone shaft 2 side, insert the taper hole of the grindstone flange 4 into the taper of the grindstone shaft 2, push the grindstone 1 all the way with both hands to break it, and then attach the U-shaped washer 5 to the cap nut 6 and the end surface of the grindstone flange. Insert it from the side between the cap nut 6 and lightly tighten it with a wrench. Pull out the stopper rod 21, stop it at the position where the sphere 23 engages with the circumferential groove 21b, and rotate the removal holder to remove the key part 20b of the engaging arm 20.
is positioned in the recess 4a and disengaged from the first arm 1.
1, release it from the grinding wheel 1, pull the knob 24 and remove the holder, turn the second arm 16 to a horizontal position, hook the hook 14 onto the pin 12 of the first arm 11, and fix the pin 17. Insert and hold the second arm 16. Tighten the cap nut 6, return the opened covers 7a and 7b, and clamp them.

Effects As detailed above, in the present invention, the first arm is provided so as to rotate horizontally on the support shaft at the upper rear side of the grinding wheel cover, and the second arm is rotated vertically at the end of the first arm directly above the center of the grinding wheel. A grindstone removal holder is provided at the end of the second arm that hangs down above the center of the grindstone axis, and its two engaging arms are engaged with the peaks of the grindstone flange and the bolt at the center of the holder is tightened. Since the taper is released from the taper and the grindstone is removed and held, there is no need for a special hanging device such as a jib crane, and there is no need for a special step to remove the taper from the grinding wheel. There is no need to remove the device, it can be operated with a single touch of a wrench, and the device can be compactly stored on the side of the cover, which has the effect of reducing costs. In addition, when the second arm is lowered vertically when attaching and removing the grindstone, if there is interference due to the angular difference in the horizontal plane between the axis of the grindstone shaft 2 and the axis of the flange cylinder due to the rotation of the first arm, the vertical A fulcrum may be provided on which the second arm lowered can pivot in a horizontal plane.

[Brief explanation of the drawing]

Figure 1 is a front view of the first arm and second arm in the stored state, Figure 2 is a plan view of the same, Figure 3 is a side view of the same,
Fig. 4 is an enlarged view of the removal holder, Fig. 5 is a view taken along line A-A in Fig. 4 when the engaging arm is not engaged with the engaging ridge of the grindstone flange, Fig. 6 4 is a view taken along line BB in FIG. 4, and FIG. 7 is a diagram showing the engagement relationship between the grindstone flange and the engagement arm and the positional relationship of the stopper rod. 1... Grindstone, 2... Grindstone shaft, 4... Grindstone flange, 4a... Recess, 4c... Peak, 5... U-shaped washer, 6... Cap nut, 11... First arm, 14... Hook, 16...Second arm, 17
... Pin, 18 ... Flange cylinder, 19 ... Push bolt, 20 ... Engagement arm, 20a ... Square groove, 20b
... Key part, 21 ... Stopper stick.

Claims (1)

[Claims for Utility Model Registration] (1) A first lever pivoted to rotate in a horizontal plane about a vertical support shaft on the rear side of the upper surface of the grinding wheel cover, and a mechanism for preventing inadvertent rotation of the first lever. means, a second lever pivoting in a vertical plane about a horizontal support shaft directly above the center of the grinding wheel at the end of the first lever, and means for holding the second lever horizontally in line with the first lever; a grindstone removal holder having an engagement arm that is provided on the same axis as the center of the grindstone at the tip of the second lever and that holds the grindstone by engaging with an engagement part formed in the shaft portion of the grindstone mounting flange; A grindstone changing device comprising: a disengagement member that pushes the grindstone shaft in the direction of loosening the taper when the engaging arm engages with the grindstone flange. (2) The grindstone changing device according to claim 1, wherein the grindstone removal holder includes means for preventing the engagement arm from coming off when engaged. (3) The grindstone changing device according to claim 1, wherein the grindstone holder is detachably provided.