JPS6039236Y2 - Deburring device for hollow bodies of plastic materials - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a deburring device for hollow bodies made of plastic material.

Hollow bodies of plastic material manufactured by blow molding generally have flash attached to the top of the neck of the hollow body, and it is desirable to remove this flash.

So, for example, in the case of a hollow body produced by blow molding with a hollow needle pierced through a sealed parison in a mold, it is clear that the marks left by the needle will not appear in the finished hollow body. is necessary.

For this purpose, when the hollow body is a bottle, a device is made for making a hole in the parison at a point beyond the part that constitutes the neck of the bottle.

By means of a small part of the parison, a bottle can be obtained in this case after removal from the mould, with a neck which is elongated and which may or may not be squeezed, and is also known as a false neck, and this part of the parison is used for blowing needles. It has a mark left by.

In order to obtain a ready-to-use bottle, parts of the parison must be removed afterwards.

Another technique, which is particularly useful for the manufacture of small capacity bottles, uses a hollow mold that reproduces the shape of two bottles with opposing necks.

In this case, a device is constructed for blowing by means of a hollow needle which pierces the parison in the area between the necks of the bottle to be blown, and this area is cut in such a way as to produce two bottles ready for use. It will be removed later by double deburring.

Finally, most blow molding techniques, which involve forcing a blow nozzle into the open end of the parison, result in a hollow body with an uneven top neck that requires debobbing.

The removal of these unnecessary parts above the useful parts of the neck of hollow bodies produced by the various methods described above can be carried out manually, but due to the high production rate of this molding machine, this operation is considerable and therefore very difficult. requires expensive labor.

The possibility of performing this task with mechanical devices has been investigated and various solutions have been proposed in the past.

A first solution is to equip the mold with a device that can carry out this cutting operation during molding.

Nevertheless, this effect is very subtle and results in an increase in the cost of the mold.

Furthermore, the deburring device must rely on molding technology.
It is therefore not possible to obtain a solution that is generally applicable.

A second solution is to have a separate deburring device to treat the hollow bodies as they exit the molding machine.

Nevertheless, devices developed for this purpose often have drawbacks.

Some of these devices are then unable to obtain processing speeds high enough to process hollow bodies with outputs equal to those of molding machines.

Other devices are difficult to control, prone to periodic failures, or very expensive.

The problem that the invention seeks to solve The applicant of this application has already proposed a deburring device which is very simple to manufacture and which can give very satisfactory results in many cases.

This device is installed on the hollow bodies to be treated and grips the hollow bodies between them at the level of the neck, and at the same time imparts a lateral movement of the hollow bodies to rotational movements about their longitudinal axes. In addition, it has a drive device constituted by a fixed guide and a movable guide, and an adjustable cutting device placed obliquely to a trajectory drawn by the longitudinal axes of the hollow bodies and perpendicular to their longitudinal axes.

This device, which has proven to be very economical due to its simplicity, nevertheless has several drawbacks.

During deburring, the neck of the rotating hollow body rolls along the cutting device, i.e. the knife, and the hollow body to be processed is caught between the cutting device and the movable guide, thereby disrupting the normal operation of the production line. happens.

The applicant has further discovered that the speed of movement of the hollow body through the device is not equal to the speed of movement of the movable guide and that the difference between these speeds can vary according to the hollow body.

The speed with which each successive hollow body passes through the deburring device actually depends on the resistance to cutting provided by the neck.

This means that if the hollow bodies to be processed are introduced into the pick-up device at regular intervals, the hollow bodies will not come out of the pick-up device according to these gaps, and this may in some cases affect the subsequent packing. Harmful to the good functioning of the machine.

Finally, the applicant has discovered that this stamping device does not make it possible to obtain very high production rates.

The applicant has developed a deburring device which makes it possible to eliminate all of these drawbacks.

This skimming device makes it possible in particular to obtain very high production rates without risk of interfering with its operation.

In particular, the deburring device according to the invention is designed in such a way that the treated hollow body does not become clogged during its deburring.

In addition, the scraping device of this invention allows complete synchronization of operations with other locations on the production line.

Means for Solving the Problems The device for deburring a hollow body made of plastic material according to this invention has a first drive device that continuously drives the hollow body along a cutting device for cutting off burrs, and this first drive device is provided with a device for successively grasping the hollow body by the neck and placing the hollow body in the correct position for deburring, and further acts similarly on the neck of the hollow body and when the hollow body is in contact with the cutting device. A second drive device is provided for applying an independent rotational movement to the hollow body about the longitudinal axis of the hollow body.

With the deburring device according to this invention, the rotational speed of the hollow body during deburring no longer depends on the speed of movement of the hollow body along the cutting device, and therefore in order to obtain an optimal degree of deburring operation, i.e. the cutting device It is possible to control this speed of rotation of the hollow body in such a way as to avoid undesirable jamming of the hollow body between the drive and the drive device.

The drive device has the function of bringing each hollow body into continuous contact with the cutting device for deburring.

The drive is provided with a device designed to receive the neck of the hollow body to be deburred and to rotate the hollow body about its own axis.

Therefore, hollow bodies of any shape can be processed.

The drive device does not actuate simply by contact; the drive device has hooks, notches, etc. that push the hollow body through the deburring device, even if the hollow body is accidentally caught between the cutting device and the drive device. equipment shall be provided.

Furthermore, the speed of movement of the drive is preferably adjustable.

Since the speed of movement of the hollow body is absolutely equal to the speed of movement of the drive, it is ensured that perfect synchronization of the skimming device with other elements on the production line is obtained.

This drive device is equipped with a device for accurately positioning the neck of a continuous hollow body for the purpose of deburring, and these devices are capable of positioning the circular groove or circular rib provided in the neck of the hollow body to be deburred. It works with elements like

In this way, deburring is always performed at the same height, which facilitates work at filling areas, stopping areas, etc.

The drive device may be a rotating disc, chain, belt, or other device capable of moving the hollow body through the deburring device.

In a preferred embodiment, the drive device is a rotating disk provided with hooks fixed to the edge surface for the arrest of the hollow body and surrounded by rollers freely rotating about its own axis;
The end faces of these rollers are contoured in such a way that, by acting in conjunction with elements, such as circular grooves or circular ribs, provided in the hollow body to be processed, the rollers provide accurate positioning of the hollow body relative to the cutting device.

Furthermore, these rollers are placed so that each hollow body held by a hook is in contact with successive rollers.

The second drive serves to impose a discrete rotational movement on the hollow bodies about their axis.

This second drive generally acts by friction between the drive element and the neck of the hollow body.

This second drive is placed upstream of the cutting device, so that when the hollow body approaches the cutting device, the hollow body is preferably already rotating.

The second drive device is, for example, endless with an edge surface coated with an elastic material that comes into contact with the neck of the hollow body at the moment when the neck of the hollow body approaches the cutting device and during the passage of the hollow body along the second cutting device. It may be a belt or wheels.

This second drive device is provided with a device capable of adjusting its speed of movement and the pressure applied to the neck of the hollow body to be deburred.

The second drive device is designed in such a way that it acts in conjunction with an element provided in the neck of the hollow body, such as a circular groove or a circular rib, so as to serve for precise positioning of the hollow body at the moment of scooping it out.

The cutting device may have a linear fixed blade, a circular fixed blade, or a cutting roller, and the cutting roller may be fixed or freely rotated about its own axis.

In a variant embodiment, the cutting blade is fixed and its corner is doubly beveled.

In this case, in order to increase the abrasion resistance of the cutting blade, the tip of this corner may be rounded.

This type of blade is obtained by slanting the edge of the blade perpendicular to the cutting tip on the side that engages the hollow body to be scraped.

It may be inclined in this manner over the entire length or part of this side.

A device may optionally be provided for heating the cutting device to facilitate its insertion into the plastic to be cut.

This heating may be obtained by heating the support block by Joule heating or by circulation of a heat retaining fluid.

A deburring device according to this invention may be designed for depriving ordinary hollow bodies.

In this case, the driving and rotational elements and the cutting device are preferably placed on a horizontal plane, and the hollow body is held vertically during the deburring operation.

A deburring device according to the invention may be designed for depriving and separating an assembly consisting of two hollow bodies connected by a neck.

In this case, the driving and rotating element and the cutting element are preferably placed in a vertical plane, and the hollow body assembly is held in a horizontal position during deburring.

In this particular case, the cutting device is clearly constituted by two parallel blades separated by a distance equal to the length of the central part to be removed.

In this case, it is preferable to provide two elements for rotating the hollow body, one on each side of the cutting device.

In order to move the hollow body to be processed to the driving element,
In order to remove the hollow bodies on leaving the deburring device and also to remove unnecessary material, the deburring device according to the invention is further provided with devices known per se.

The deprivation device according to the invention will become clear from the following description of two examples of practical embodiments.

However, it should be understood that this description in no way limits the scope of the invention.

For this idea can have variations that do not depart from its scope or spirit.

The first embodiment relates to a deburring device which is particularly suitable for separating pairs of two hollow bodies with opposing necks, while the second embodiment relates to a deburring device for separating the necks of ordinary hollow bodies. The present invention relates to a defiltration device particularly suitable for the purpose of decontamination.

In the following description, reference is made to the accompanying drawings.

As shown in the drawings of the first embodiment, the deburring device is made of an iron part 2 and supports a rotating shaft 3, and a first driving device cut out from a disk 4 is fixed to the rotating shaft 3.

A device, not shown, imparts to this disc 4 a rotational circumferential speed that is the same as the rotational speed of the conveyor element 5, which traverses the set of hollow bodies 6 to be treated coming from a forming installation, also not shown. Support it in the correct position.

Rollers 7 are fixed on each side of the circumference of the disc 4 and at the same time serve as guiding and rolling support elements for the neck of the hollow body 6.

These rollers 7 rotate freely about their axes.

The number of rollers on the same side of the disk 4 is preferably an even number,
It is therefore possible without difficulty to increase the distance between two adjacent axes of rotation of a hollow body 6, for example a bottle, by removing one roller from each two.

It is thus possible to process hollow bodies with necks with highly variable diameters with the same deburring device without substantial deformation.

The diameter of the roller 7 is 1.5 to 2.5 times larger than the diameter of the neck of the hollow body to be hollowed out so as to ensure a sufficient rotation seat for the neck of the hollow body. Equal to compensation as much as possible.

The contours of the edge surfaces of the rollers 7 must furthermore be adapted to the shape of the necks of the hollow bodies to be treated in order to work together with the elements provided in these necks, these necks being continuous for deburring purposes. For example, a circular groove or a circular rib for positioning the hollow body.

For the treatment of hollow bodies with necks provided with external threads, recesses facing the external threads are provided in the edge surfaces of the rollers 7, in order to prevent this external thread from influencing the position occupied by the hollow bodies. is normal.

A hook 8 having a shape corresponding to the shape of the neck of the hollow body to be processed is further provided on the edge surface of the disk 4.

These hooks 8 and 7 are placed so that the neck of each hollow body that engages with the hook rests on two adjacent pairs of rollers 7.

The deburring device also has a second drive for rotating the neck of the hollow body to be deburred.

This second drive consists of two endless belts 9 extending between a drive pulley 10 and a return pulley 11.

With the help of a chain wheel 14 keyed to the rotating shaft 3 of the disc 4 and a transmission chain 13, the drive pulley 10 can be rotationally driven by the chain wheel 12 keyed to the shaft.

However, it will be appreciated that the drive pulley 10 may be rotated by an energy source that is separate from the energy source that drives the disc.

The driving pulley 10 and the return pulley 11 are placed so that the endless belt 9 contacts the neck of the hollow body during movement of the hollow body created by the disk 4.

The force with which these endless belts 9 are pressed against the neck of the hollow body 6 can be further adjusted by means of a tension pulley 15, and the tension cover IJ 15 can be adjusted by means of a spring 16 and a tension spring 17.

Furthermore, these endless belts 9 are placed so as to touch the neck of the hollow body at each location where the burr is to be cut.

The contour and arrangement of these endless belts is preferably designed so that they work together to accurately position the neck of the hollow body that is to be finally carved out.

Finally, the deburring device has a cutting device constituted by two parallel blades 18 mounted on a support block 19 which is removably and adjustably fastened to the frame 1.

The distance of these blades 18 and the position of the blades are obviously chosen so as to make two cuts at the desired locations in the neck of the hollow body.

When the hollow body is driven by the disc 4, these blades are placed as much as possible so as to slightly cut the trajectory defined by the neck of the hollow body.

The operation of the deburring device described above is very simple and very reliable.

The hollow body 6 fed by the conveyor element 5 is continuously gripped by the neck by the hook 8 of the disc 4 rotating in the direction of the arrow 20 and correctly positioned by the rollers 7 .

At the moment when the neck approaches the cutting device, the endless belt 9 moving in the direction of the arrow 21 contacts the neck and applies a rapid rotational movement to the neck in the direction of the arrow 22, during which the blade 18 makes the desired cut. .

During the cutting operation, it is impossible for the hollow body to become wedged between the disk 4 and the blade 18 due to the hook 8, and furthermore, the speed of movement of the hollow body through the deburring device is kept constant. , so that the pick-up equipment can be fully synchronized with other elements of the production line, either before or after it.

One of the advantages of the deburring device according to this invention is that the speed of the drive can be selected to best couple the deburring device on the production line, and the rotation of the hollow body can be adjusted to obtain optimum cutting conditions. It's about choosing speed.

When tested with a set of two hollow bodies made of polyvinyl chloride with opposing necks, it was possible to obtain climbing speeds of more than 2000@71 per hour.

As a comparative example, using a known deburring device with fixed guides and movable guides and with the same set of hollow bodies, it is possible to produce more than 60 cuts per hour without encountering any serious difficulties during operation. It was impossible to obtain speed.

Second Embodiment For the sake of clarity, only the elements necessary to better understand the structure and operation of the deburring device are shown in FIGS. 3 and 4.

As is clear from Figures 3 and 4, the scraping device is a disk 33.
The frame 31 supports a rotating shaft 32 that fixes a first drive device consisting of a frame 31.

A rotation peripheral speed synchronized with the speed of a conveyor element 34 provided with blades 35 is applied to the disc 33, on which the hollow bodies 36 to be processed are placed in a vertical position, and these hollow bodies 36 are placed in a forming equipment. It comes from (not shown).

A roller 37 that rotates freely around its own axis is attached to a disk 3.
Fix it around 3.

These rollers 37 serve as guiding and rolling support elements for the neck of the hollow body to be stripped.

The diameter of the rollers must be sufficient to provide sufficient rotational seating against the neck of the hollow body.

The contour of the edge surface of the rollers 37 is further adapted to the shape of the neck of the hollow body to be treated so as to work together with elements provided in the neck, such as circular grooves or circular ribs, for positioning the continuous hollow body for deburring purposes. Must fit the mold.

For the treatment of hollow bodies with necks provided with external threads, the edge surfaces of the rollers are provided with indentations facing the external threads, in order to prevent the external threads from influencing the position occupied by the hollow bodies. That is a good thing.

A hook 38 is further provided around the disk 33, and the shape of the hook 38 is adapted to the shape of the neck of the hollow body to be treated.

The hooks 38 and 37 are placed so that the neck of each hollow body that engages within the hook contacts a pair of adjacent rollers.

The deburring device also has a second drive device for rotating the neck of the hollow body to be deprived.

This second drive is separated from the endless belt 39 extending between the drive pulley 40 and the return pulley 41.

Chain wheel 42 keyed to the shaft and transmission chain 4
3 and a chain wheel 44 keyed to the shaft of the disc 33, the drive pulley 40 can be rotationally driven from the shaft of the disc 33.

However, it is quite clear that the drive pulley 40 is driven by an energy source that is separate from the energy source that drives the disc 33.
can be rotated.

so that during a portion of the period when the hollow body is being moved by the disc 33, the endless belt 39 contacts the neck of the hollow body;
Place the drive pulley 40 and return boob IJ41.

A device (not shown) is provided to adjust the force with which the endless belt is brought into contact with the neck of the hollow body.

Furthermore, the endless belt 39 is placed so as to come into contact with the neck of the hollow body at a position as close as possible to the position where the scraping is to be performed.

The contour and positioning of the endless belt are preferably designed to cooperate in precisely positioning the neck of the hollow body that is to be finally skived.

According to this invention, the deburring device has a straight fixed blade 4.
A cutting device consisting of 8 is provided and a blade 48 is provided on a support block 49 which is removably and adjustably fixed to the frame.

This blade 48 may have the profile shown in FIGS.

As is clear from these figures, the blade 48 has a beveled cutting edge 50 and a bevel along the edge perpendicular to the cutting edge 50 on the side that engages the hollow body from which the blade 48 is to be scraped. Either it is partially inclined at 51 or it is entirely inclined at inclined part 52.

The leading edges 53 of these blades 48 are preferably rounded to increase resistance to wear.

Finally, the bevel of the blade may be made to obtain a tip 53 that projects beyond the cutting edge of the blade, as shown in FIG.

The blade 48 is adapted to the deburring device in such a way that when the hollow body is driven by the disk 34, the trajectory drawn by the neck of the hollow body is slightly cut and that the cutting of the burr to be removed begins at the burr 53. put it in position.

The operation of the deburring device described above with respect to FIGS. 3-6 is very simple.

The hollow body 36 fed by the conveyor device 35 is gripped at the neck by the hook 38 of the disc 33 rotating in the direction of the arrow 54 and correctly positioned by the rollers 37 .

At the moment when the neck of the hollow body approaches the blade 48, the endless belt 39 moving in the direction of the arrow 55 contacts the neck of the hollow body and applies a rapid rotational movement to the neck in the direction of the arrow 56, while the blade 48
Cut the gap.

The cut is initiated by piercing the tip 53 of the blade into the neck of the hollow body at the point where it is desired to make the cut.

Due to the hook 38, it is impossible to sandwich the hollow body between the disk 33 and the blade 48 during the cutting operation.

Furthermore, the speed of the movement of the hollow bodies through the pick-up device can be kept constant, so that it can be perfectly synchronized with other equipment in the production line, either before or after the pick-up device.

It has been found that good cutting performance can be obtained by using a blade with a double beveled cutting edge.

Furthermore, it is possible to process high-temperature hollow bodies at high speed without undergoing deformation at the point of cutting.

Finally, it is possible to work with short blades that have the advantage of being rigid.

This idea can be implemented as follows.

(1) In order to grasp the hollow body only by the neck and place the neck in the correct position, the device provided in the first drive device together with an element such as a circular groove or circular rib provided in the neck of the hollow body to be ripped off. 1. A device for removing a hollow body of a plastic material as claimed in the claims of the utility model registration.

(2) A device for removing a hollow body made of plastic material as claimed in the claims of the utility model registration, characterized in that the first drive device is provided with a hook-like device for reliably driving the hollow body.

(3) A device for removing a hollow body made of plastic material as claimed in the claims of the utility model registration, characterized in that the first driving device is a disk.

(4) The disk according to the above item 3, characterized in that the disc is provided with a hook that drives the hollow body and the surrounding ribs that act together with the ribs and grooves provided on the neck of the hollow body to be removed. A device for removing hollow bodies made of plastic materials.

(5) A device for removing a hollow body made of plastic material as claimed in the claims for registration of a utility model, characterized in that the first drive device has a chain.

(6) A hollow body scraping device made of plastic material as claimed in the claims for utility model registration, characterized in that the first drive device has a belt.

(7) A hollow body scraping device made of plastic material as claimed in the claims for utility model registration, characterized in that the second drive device has a belt.

(8) A deburring device for a hollow body made of plastic material as claimed in the utility model registration claim, characterized in that the second drive device has a wheel having a periphery covered with an elastic material.

(9) The device for removing a hollow body made of plastic material as claimed in the utility model registration claim, characterized in that the second drive device has a device that can adjust its moving speed.

(10) An apparatus for scraping hollow bodies made of plastic material as claimed in the utility model registration claim, characterized in that the second drive device has a device that can adjust the pressure applied to the neck of the hollow body to be scraped.

(11) A device for removing hollow bodies made of plastic material as claimed in the claims of the utility model registration, characterized in that the cutting device is a fixed straight blade.

(12) The deburring device for a hollow body made of plastic material according to item 11 above, wherein the blade has a doubly inclined corner portion.

(13) The device for scraping a hollow body made of plastic material according to the above-mentioned item 1, characterized in that the tip of the corner of the blade is rounded.

(17g) A device for cutting off a hollow body made of plastic material as claimed in the claims for registration of a utility model, characterized in that the cutting device is a circular fixed blade.

(15) A device for removing hollow bodies made of plastic material as claimed in the claims of the utility model registration, characterized in that the cutting device is a rotating circular blade.

(16) A device for cutting off hollow bodies made of plastic material as claimed in the claims of the utility model registration, characterized in that the cutting device is provided with a device for heating the cutting device.

[Brief explanation of the drawing]

FIG. 1 is a side view of the deburring device of this invention for the first embodiment, and FIG. 2 is a sectional view taken along line A-A' in FIG. 1.
Fig. 3 is a front view of the defrauding device of this invention for the second embodiment, Fig. 4 is a plan view of the depriving device shown in Fig. 3, and Figs. 5 and 6 are shown in Figs. 3 and 4. It is a perspective view of the blade provided in the deburring device. In the figure, 4 is a first drive device, 6 is a hollow body, 9 is a second drive device, 18 is a cutting device, 33 is a first drive device, 36 is a hollow body, 39 is a second drive device, and 48 is a cutting device. It is a cutting device.

Claims (1)

[Claims for Utility Model Registration] A cutting blade 48 attached to cut the burr has a first drive device installed to push the hollow body in turn,
This first drive device is a rotating disk 33 having a plurality of rollers 37 on its periphery, each roller 37 having an outer shape that cooperates with a circular groove present in the neck of the hollow body to be cut out; The endless belt 39 is thereby adapted to ensure a precise positioning of the hollow body relative to the cutting blade and which acts on the neck of the hollow body and rotates the hollow body about its longitudinal axis in contact with the cutting blade. In the device for removing the neck of a hollow body made of plastic material having a second drive device, the first drive device further includes a hook 38 on its periphery that acts on the neck of the hollow body to push the hollow body. A device for removing hollow bodies made of plastic material.