JPH0387210A - Gear pump type elastomer treating device - Google Patents

Abstract

PURPOSE: To rapidly vulcanize an elastomer of equal temp. to establish stability by constituting a passage part of passage means and starting the same at respective ends of gears in the engaging sections of gears and collecting the elastomer at those opposite ends to introduce the same into an outlet passage. CONSTITUTION: Flastomer mass is extruded from a gear engaging section transported along the gear grooves of two gears 2, 3. In the front surface of the engaging section of two gears 2, 3, a housing wall has a triangular space 41 and one retricted by a housing wall and engaged teeth is demarcated. The triangular space 41 becomes wide toward the ends of gears 2, 3 and the elastomer is propelled in two directions to be introduced into passages 43, 44. These grooves are finally united to enter the common outlet 45 of the housing wall.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a gear pump type enstomer processing machine.

A machine for processing elastomeric materials is known from European Patent Application No. 0062017. In this machine, which is fed with enstomer material, especially rubber, in strip form, the material consists of two meshing gears, preferably with helical sections inclined towards each other and circular towards the center of each gear. The material that terminates in the groove is supplied into the exit space. On the side where the gears engage each other, in the area where the teeth separate, a wedge is inserted into the groove and the material fed to the machine is withdrawn through the central opening.

These machines achieve good mastication of the entomer, but after a portion of the strip material has filled into the tooth groove,
Due to the fact that it is not completely masticated and is in fact only conveyed, whereas the other abrasive material that cures into a longer path and passes in the axial direction of the gear is more thoroughly masticated and heated. , the problem still exists that the temperature uniformity of the emerging material is imperfect.

For example, in the embodiment according to said European patent application no. No delivery flow occurred. It is an object of the present invention to improve this situation.

SUMMARY OF THE INVENTION The object is achieved in accordance with the present invention by a machine having the features set out in claim 1.

According to one preferred embodiment, the gear is a helical gear rather than a straight flat tJ4 gear, and the filling of the internal groove with engagement between the opposing teeth is caused by the 4J teeth at the two ends of the gear. It is oriented with respect to the direction of movement in such a way that it takes place gradually, so that the groove is finally filled. This allows for better mastication and more gradual cutting of the raw material in strip form, thus providing a more even resistance.

It is also preferred that the tongues or wedges have an adjustable insertion depth within the gear groove, thereby allowing control of flow back through leakage.

When the elastomer is extruded from the tooth space, the flow path for the elastomer is determined by the shape of the enclosed space.

In the first part of the periphery, the gap is quite critical, but in the tooth engagement area a cavity is preferred, which is triangular when viewed axially and has a cross section that increases towards the ends. has. For example, the cross section constitutes half the length and when measured around the periphery of the gear 3
may be constant over a central section corresponding to -8° and then laterally, e.g. 15° in a straight direction.
20', preferably 6° and 15°, respectively, also measured at the periphery of the gear. Q at the end
The groove portions starting at may initially be defined substantially perpendicular to the direction of the outer wall therein, and then merge to meet at the exit opening.

Passage on each side: An elastomer product that is uniformly processed and has a uniform temperature is poured into the mold by the flow extruded from the gear space to reach and pass the 'f stage. , which is heated there and, in the case of rubber, is necessarily particularly suitable for being flushed with oil at the outlet J3.

In the following, the invention will be explained in more detail with reference to non-limiting examples shown in the accompanying drawings, in which: FIG.

Embodiment FIG. 1 shows a gearbox 1e designed for rubber and other elastomer products, into which the products are fed in the form of strips 4.5 and kneaded into molds 6 or the like. Figure 2 illustrates what is emitted in the form of mass. This schematic diagram does not show the drive side, where one gear is driven via the drive shaft, but only shows the ends of the gears 2, 3.

FIG. 2 shows the two gear wheels 2.3 in an exploded view, and FIG. 3 shows a section through the circumferential groove 7 of these gear wheels. As can be seen in the drawings, the gears 2.3 are provided with circumferential grooves 7 of rectangular cross section, which are located approximately in the center of the toothed portion and are somewhat deeper than the grooves Ia. In the locking area there is a girdle defined by two cylindrical surfaces and two flat surfaces. Into this gap a tongue-beating wedge 8 is inserted in the direction opposite to the rotational movement of the gearwheel 2.3. I
! ! ! 8 is defined by two planes and two cylindrical surfaces. The wedge 8 is pressed downward by the adjusting screw 9. An adjusting screw 9 is threaded onto the wedge 8 from outside the pump housing, thus controlling the increase or decrease of the return leakage.

2 and 3 also show that the element 10 is inserted into the circumferential groove 7 slightly below the common central plane of the gear wheels 2.3. These elements 10 are made of rubber strips 4.
5 and push the separated strip portions into the tooth grooves. The elements 10 are such that they substantially fill the space defined between the cylindrical wall of the housing and the cylindrical wall of the circumferential groove 7, so that the elements 10 substantially fill the space defined between the cylindrical wall of the housing and the cylindrical wall of the circumferential groove 7, so that the space between the elements 10 and the engagement area between the teeth is maintained within the gear pump. It is designed in such a way that it can sustain the lifestyle of the people living there. Element 10 is secured in place by bolts screwed from outside the housing.

FIG. 2 shows, in particular, that the gear wheels 2, 3 are helically cut on each side of the circumferential groove 7, beveled in opposite directions. It can also be seen from FIG. 2 that the tooth portion closest to the center 1lIII or circumferential groove 7 engages first, so that the material in the tooth groove is forced outwardly towards the edges by the successive engagement of the teeth. It is also clear that the teeth are inclined so that the

As in known gear pumps for this purpose, sealing and scraping means are arranged in the space between the flat end portion of the teeth and the housing. Since such sealing and scraping means are already known, they will not be described in more detail here.

Figures 4 and 5 show that the l cystomer vXJfS is
Two gears 2, only partially shown in the figure
．． Fig. 3 shows the manner in which it is pushed out according to the invention from the tooth engagement area into which it is conveyed along the tooth groove of No. 3; gear 2
．． Immediately in front of the locking area between the third and third sides, the housing wall is adapted to define a triangular space 41 (defined by the housing wall and the engaging teeth).
As seen in the figure, the triangular space 41 is
It becomes wider towards the 3° end so that the elastomer is propelled into the passageway 43, 44 in two directions. These grooves are finally integrated into a common outlet 45 in the housing wall.

In a non-limiting example of the invention, the outer diameter of both cars 2.3 is 1
98s+r, these gears were cut with a 5IMR normal module, the helix angle was 15, the nominal] (direction was 206, and the number of teeth was 36.

The gear pump was driven by a hydraulic motor with a power output of 110 kW at about 7 Orpm, providing a rubber processing speed of about 24-25897 minutes.

The housing wall defining the triangular space 41 was located 45 am II from the common plane of the gear axes, and this distance was increased to 60 aw at the ends. The passages 43,44 had a cylindrical cross-sectional diameter of 25 m in their straight sections.

The invention allows an essentially uniform temperature elastomer to be fed into the mold under pressure and, in the case of rubber, rapidly vulcanized to establish stability. Since the elastomer processing machine is portable, it can be serially leached into a large number of different molds, thus achieving high productivity. Temperature uniformity also ensures an evenly vulcanized product. This means that if the temperature of different parts of the product is determined by the external heat through the low conductivity material and the unequal temperature distribution of the rubber during injection, This is difficult to achieve with other methods. The improvements according to the invention therefore enable both faster and more uniform vulcanization in extrusion.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the gear pump; Fig. 2 is an exploded view of the gear, the gear pump, and the model and split sealing means; Fig. 3 is a sectional view of the gear pump that fits on a plane passing through the circumferential groove of the gear; FIG. 4 is an axial sectional view of one embodiment of the present invention, and FIG. 5 is a radial sectional view of one embodiment of the present invention along line V-V of button 4. On the drawing, 1...Gear pump, 2.3...Gear, 4°5...Strip, 6...Mold, 7...Peripheral groove, 8...
... tongue or wedge, 9 ... m-section screw, 10 ... element, 11 ... bolt, 41 ... triangular space, 43.4
4...Aisle, 45...Common exit.

Claims (6)

[Claims] (1) A gear pump type elastomer processing machine comprising two interengaging gears (2) mounted in a housing.
, 3), two inlet holes for introducing a first product (4, 5) in the form of a strip into the space between said gear and the housing, and said product from the engagement area of said gear. passage means for guiding said gear, said gear being centrally provided with a circumferential groove (7) in which its teeth terminate;
) is inserted into said circumferential groove (7) between the gear wheels in the gear engagement area, said tongue (8) being oriented in a direction opposite to the direction of rotation of the gear wheels (2, 3), and a split sealing element ( 10) of the two gears (2, 3) at a location in said housing where the grooves (10) are located between the gear engagement area and the respective inlet holes.
7), in which said passage means consist of passage parts (43, 44), which passage parts are fitted with gears (43, 44);
A gear pump type elastomer processing machine characterized in that it begins at each end of the gear in the engagement zone of 2, 3) and gathers at their opposite ends to enter the outlet passage. (2) In the elastomer processing machine according to claim 1, the teeth of the gears (2, 3) are helical teeth, and the portion of each tooth closest to the respective end of the gear engages. Gear pump type elastomer processing machine characterized in that the final part of the teeth is oriented in a fletching or herringbone style. (3) An elastomer processing machine according to claim 1 or 2, characterized in that the tongue (8) is adjustable to produce an adjustable return flow. Elastomer processing machine. (4) In the elastomer processing machine according to claim 1, the gears (2, 3) engage in the tooth engagement area.
a space (41, 42) bounded on one side by and on the other hand by the wall of said housing;
A gear pump type elastomer processing machine characterized in that the cross section of the space gradually increases toward the end of the gear. (5) An elastomer processing machine according to claim 4, in which the space is a central portion (41) of essentially constant cross-section and wedge-shaped on each side (42) towards the gear end. A gear pump type elastomer processing machine characterized by having an expanded one. (6) In the elastomer processing machine according to claim 5, the central portion (41) has a constant cross section.
A gear pump type elastomer processing machine, characterized in that the gear pump has a length corresponding to approximately one-half of the length of the gears (2, 3).