Tool changing mechanism of numerical control bamboo splitting machine

Abstract

The invention discloses a tool changing mechanism of a numerical control bamboo splitting machine. The tool changing mechanism is characterized in that a central blind hole is formed in the front endof a cutter head shaft; a U-shaped groove is formed in the tail part close to the blind hole and perpendicular to the central blind hole; a cutter head, a disc baffle and a compression spring are sequentially installed from the front end of the cutter head shaft until the cutter head is tightly closed to a shaft ring on the cutter head shaft; a sucker shaft is inserted into the central blind holeof the cutter head shaft; after a cylindrical pin penetrates through the disc baffle, the cutter head shaft and the sucker shaft respectively, the disc baffle is fastened on the cutter head by two screws; a magnet mounting seat is arranged in front of the sucker shaft; a disc magnet is fixed on the magnet mounting seat; the distance between the end face of the mounted disc magnet and the end faceof the sucker shaft is L2; a friction element support and an electric push rod are arranged on a frame on the left side of the cutter head; an arc friction element is arranged in a hole of the friction element support; one end of the arc friction element is hinged with the electric push rod; the other end of the arc friction element is opposite to an outer circle of the cutter head; a cutter headblocking piece is arranged on the back face, right opposite to a bamboo tube, of the cutter head; and the distance between the cutter head blocking piece and the back face of the cutter head is L1.

Description

[0001] Technical field: [0002] The invention relates to a tool changing mechanism of a numerically controlled bamboo splitting machine in the field of bamboo processing, specifically: under the requirement of cutting the width of bamboo strips, according to the measured diameter of the small head of the bamboo tube, different bamboo tube centering mechanisms and bamboo splitting mechanisms can be replaced. When combining the knives, it can not only make the knife change convenient and accurate positioning, but also can not deform the cutter head under the action of huge impact force when cutting bamboo. [0003] Background technique: [0004] A schematic diagram of an existing numerically controlled bamboo splitting machine is as follows: figure 1 As shown, its working principle is: the push plate 1 stops at the rear of the frame, and the bamboo tube is sent into the two V-shaped supports 4 from the left side of the frame by the conveying mechanism. During the process of send...

AI Technical Summary

Problems solved by technology

However, the cutter head of the existing CNC bamboo cutting machine is easily deformed during use, which greatly reduces the service life of the cutter head, and the bamboo cutting process cannot be completed once in 8.5 seconds. The main reason is: due to machining errors It always exists (if the back of the cutter head and the cutter head stopper are processed according to the requirements of grade 8 precision, the flatness errors are 80um and 50um respectively), plus the installation error and the slight deformation of the cutter head after initial use, the total error It may reach 200um; and because the position of the cutter head stopper is fixed after installation, when the back of the cutter head of six combined bamboo cutting knives with different blade numbers is turned to the position opposite to the cutter head stopper, it may appear The most common situation is: either the back of the cutter head is only in close contact with the cutter head stopper once, and the remaining 5 times have poor fit or gaps; or the friction resistance is large when the cutter head rotates or it cannot rotate at all.

If it is the former, when cutting bamboo, under the action of a huge impact force, the cutter head will be deformed and shorten the service life of the cutter head; if it is the latter, the time for changing the blade will be prolonged or the cutter head will not be able to rotate at all.

In order to solve the above problems, before changing the tool, it is better to keep the back of the cutter head out of contact with the stopper of the cutter head, and leave a certain gap between the two ends. After the cutting of the bamboo is completed, the cutter head is returned to the position before the axial movement of the cutter head, so that the back of the cutter head of the 6 combined bamboo cutting knives with different blade numbers can be turned to the same position as the knife head respectively. The relative position of the disk stopper can be close to the cutterhead stopper, which can not only solve the deformation problem of the cutterhead under the action of huge impact force, but also make the back of the cutterhead have no friction resistance when changing the tool; however, because the cutterhead The diameter is 1000mm, and the mass is large. After rotating at a speed of 12r / min and reaching the designated position, the stepping motor stops rotating. Although the stepping motor has a braking function and the single-stage worm reducer also has a self-locking function, due to the quality of the cutter head It is large, and suddenly stops after turning at 12r / min, which will generate a large inertial force, coupled with the small gap in the transmission mechanism, so the cutter head cannot stop immediately after rotating in place, and will slowly swing back and forth several times before stopping , It takes about 3-5 seconds to swing slowly for many times like this, and it will take 3-5 seconds to cut a bamboo tube, which greatly reduces the productivity of the bamboo splitter (because it can only be cut after the cutter head stops swinging, Cutting the bamboo can start), therefore, after the knife change is in place, a locking device is required to lock the cutter head instantly, and release it after a delay, and then the cutter head moves axially

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