SU1256982A1 - Injection assembly for moulding machines - Google Patents

Abstract

The assembly comprises a hydraulic unit 19, a plasticiser unit having a plasticiser cylinder 16 and a worm located therein, an injection unit including an injection cylinder 9 and an injection nozzle 39, a plasticiser drive 36 and a support construction for these components. The support construction includes a base 34 and a support 18 to which the base 34 is detachably secured and which is resistant to bending and torsion. The plasticiser drive 36, which comprises a motor 1, a gearing 2 and a coupling 3 with an intermediate shaft, is rigidly disposed on the base 34. The injection cylinder 9 and the plasticiser cylinder 16 are disposed so as to be axially displaceable on the support 18 and are connected to the plasticiser drive 36 via a shaft-hub connection. <IMAGE>

Description

2. The node according to A.1, is different. and with the fact that the injection cylinder is connected by a sleeve connected at one end to the screw and the other to the sleeve of the 1PARK coupling, which is made in the protrusion of the day shaft and the sleeve surrounding it, and the sleeve is mounted movably relative to the intermediate shaft.

 3, The assembly in accordance with Claim 1, in connection with the fact that the supporting surfaces of the upper plate are located, horizontally in the same plane with the formation of sliding guides.

The invention relates to Bpr1; 1ska devices, in particular, to a special arrangement of elements of this unit containing a plasticizing cylinder and mHeixOM, an injection cylinder and the water of a kneading unit, and can be used in the chemical industry and mechanical engineering.

In order to ensure reliable wear-resistant operation of the sub-lacquer elements of the injection unit and to transfer reactive forces and moments to balance the workload and the own weight of machine parts, a strong, precise connection is necessary between the plastification cylinder, the injection cylinder and the plasticity actuators.

The injection unit temporarily approaches the injection mold and then retracts from it to thermally separate the hot nozzle from the cooled mold.

In addition, during assembly work, it is necessary to exit the end of the plasticizing cylinder and the injection nozzles from the base plate. For this, the injection unit shifts forward and forward, overcoming a large distance.

For this reason, the injection unit must be very compact and sub-specific.

Known constructions (patent DE 2227133, cl. B 29 F 1/02, published in 1980) have a plasticization drive rigidly fixed on piston-made in the form of guide tracks, each each has a horizontal sliding surface and a side surface inclined to it. slip.

4. A unit according to Clause 3, characterized in that it is equipped with cup springs for tensioning the sliding guides.

5. The knot on item Z. characterized by the fact that the top plate

with sliding guides connected to the support by means of screws.

the injection rod of the cylinder, i.e. the actuator travels with the piston during injection, as well as during the nozzle inlet and outlet.

The disadvantage of these structures is that the plasticization drive performs each movement along with a sub screw and an injection unit.

Other constructions (Patent DE No. 1908530, cl. B 29 F 1/02, published 1977) have a kneading drive directly coupled to the body of the injection cylinder, the screw being rotated by an axially axially oriented key shaft or using a special hollow shaft. For other devices, drive movement is characteristic only in the case of nozzle approaching or retracting. During the translational twin-gapping of the auger, such an interchange 1 is not necessary.

Also known injection unit injection molding machines (patent No. 135876, CL, B 29 F 1/00, published in 1979, fng.2) 5 contains a cap;, its hydraulic unit, a kneading cylinder, a kneading drive in the engine, coupling and gearbox, wherein the injection cylinder and the plasticization cinder are mounted for movement on a support, and the hydraulic cylinders, the hydraulic unit, have a supply pipe in the form of telescopic pipes. In this solution, movement is provided

the injection cylinder and the plasticizing cylinder are supported on the support, and the engine and clutch are fixed to the stand by the Hydraulic unit, the engine is fixed inside the supporting structure, and the gearbox, injection and plasticization cylinders are mounted for movement on the support and are connected to the fixed group of assemblies using a key sleeve, which provides for the supply of the injection nozzle. Between the piston of the injection cylinder and the gearbox, a second key coupling is necessary to ensure the movement of the auger for the injection.

However, the known injection site is characterized by insufficient reliability and complexity of the design.

To ensure reliable operation of the injection unit, i.e. in order to make a strong coaxial connection of all its components, it must be made in the form of a compact unit containing all moving parts of the machine.

To meet such high demands, all of the above inventions are characterized by high material costs. The drive as an integral part of the injection unit is designed in a special design, which does not allow the use of standard gearboxes and engines. This will be costly for small-scale production of large injection molding machines.

Interchangeability or change of drive, i.e. its assembly from unified nodes is difficult. Access to the injection cylinder, which forms the central unit of a single unit, is conditional.

The large weight and large dimensions of the moving parts of the machine result in high material and structural costs in the manufacture of -direction slides.

The purpose of the invention is to increase the reliability of the site and simplify its design,

The object of the invention is to reduce the number of moving parts of the injection unit and to use standardized units to ensure interchangeability or change of the drive using standard gears and engines, and the injection unit should have good access to all design elements.

Easy connection for easy installation and noise control.

The problem is solved by means of an injection and kneading unit, consisting mainly of an engine, a gearbox and a coupling coupling. It is rigidly connected to the stand, which is attached to the common foundation of the machine. The injection cylinder and the kneading cylinder are jointly moved relative to the support for the length of the maximum stroke of the key coupling - the key shaft, and the support is fixed on the stand by a detachable connection.

The stroke of the key coupling - the key shaft corresponds to the maximum stroke of the inlet and outlet of the plasticization cylinder, which is fixed on the support and. moves using displacement cylinders; and, moreover, corresponds to the maximum stroke of the injection cylinder. The stroke of the key shaft is greater than the maximum stroke of the screw during injection into the cylinder of the plastic -: - tication.

In the c1-1-cylinder of the injection, a sleeve is placed, which at one end is attached to the engine by means of a coupling ml ft, the other end, where the actuator 5 is attached to the key sleeve hub. The sleeve can move relatively rigid j of the intermediate shaft along the length j shchindra plasticization. The base of the injection cylinder “POD1-GOE plasticization cylinder” and rigidly fixed sub-shaft of the intermediate shaft, driven by the movement of the plasticizer, are mounted on the support. The support has a rather large cross section for stiffness. The hollow spaces of this cross section, in the form of cells or pipes, partially or fully, can be of an A-F tank with a capacity for storing oil.

The bearing surfaces of the injection cylinder caps and the plasticization cylinder support stand are leveled horizontally and the o6pa3inoT, along with the common bearing surface, is a backlash-free sliding guide. Sliding guides consist of two guiding tracks, KJ and a lane has two glide planes, one of which is mounted horizontally. One surface of the slip is subjected to additional tension, for example by means of a cup-shaped spring,

The guided tracks and the slab of the oil tank constitute a single knot. The guide tracks in the area above the oil tank are in the form of caps that can be unscrewed. The supply of the two working cavities of the injection cylinder is provided with hydraulic oil by two telescopic tubes installed parallel to the injection axis. The connecting plug-in hydraulic units are directly flanged to the corresponding jN1P1Dr iJnpucKa clamps, and the fixed connected unit is fixed on a common support.

In fig-. 1 shows the injection unit, side view; figure 2 is the same, the type of reconciliation; in FIG. 3 - section A-L in FIG. PA 4 - the section in Fig.2.

Figures 1 to 4 show one example from among the possible ispolienny injection unit according to the invention.

The plasticization drive, for example, has an engine 1 with an adjustable PD: BREAKHOUSE revolutions and a standard spur gearbox 2, which prevents plastic-plastic cylinders from entering and discharging plastic cylinders through the base plate. The plasticization drive 36 is located at the end of the injection unit on the stand 34 and thus can conveniently be replaced by another drive. The plasticization cylinder 16 and the injection cylinder 9 are located on a box-shaped or tubular support 185 which aeptically stands on the bottom 20 of the machine. The cross-sectional dimensions of the support 18 are rather large so that the workforce and the disposition on support 18 are balanced. Deforming the support 18 is small, so all the injection unit remains in one line and are kept in a coaxial state. The reactive torque caused by the torque of the kneading drive 36 ,, is transmitted from the support 50 18 to the stand 34. Therefore, the stand 34 is rigidly fixed to 18 by means of a plug connection. This ordering of the bearing elements

an open Ti-55 injection unit is produced making an internal profile

PA with a relatively low material consumption, consisting mainly of the center of plasticization 16, cylinder

bushings 24, 24. When wiring 24, 24 with sleeve 22 is required, precise installation is required without any distortions

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injection 9 and a kneading drive 36. The assembly is characterized by xopometi availability during repair work or during installation. The reaction force 5 alone, which balances the injection force, is transmitted from the support post 15 of the plastic cylinder 16 directly onto the injection cylinder 9 by means of clamping bolts 42. (O The support 18 is designed as a box. The boxed shape ends in the zone where the support post 15. To provide the necessary rigidity, the support 18 has a rather large tS cross section. The hollow space of the support 18 can be used under the oil tank 26.

In the area under the support post 17, the support 18 has the form of an i-shaped pro 20 fil with a constriction.

Between the substandard plastichi drive: ation 36 and the MOVING injection cylinder 9, there is an axially movable keyway coupling 37 25 (sleeve and key shaft) for transferring torque from the plastication drive 36 and to the screw 21. The key shaft moves from one side with respect to drive 36 during

TsNN-1 16 and injection 9 and on the other hand relative to the screw 21 while the screw 21 is moving in the plasticizing station 16. The axially movable keyway coupling 37 consists of a profiled intermediate shaft 25 and a sleeve 24, which, for example, can be manufactured with an involute gearing. Inside the injection cylinder 9 there is a sleeve 22, which is fixed at one end on the sleeve 14 of the screw 21. At the other end of the sleeve 22, the sleeve 24, 24 of the movable key sleeve 37 is fixed, the sleeve 22 passes through the cylinder 11 of the injection cylinder 9 which is located on the drive side. The sleeve 22 is mounted, sealed in the cover 11, and has the possibility of axial movement and rotation of the screw. On the sleeve 22, a ring-shaped rotary piston 23 is fixed, which is located on the tubular piston rod 13. A precise

bushings 24, 24. When connecting the sleeve 24 ,, 24 with the sleeve 22 requires precise installation without bias with respect to

alignment. For this reason, the CBH jb between the sleeve 22 and the sleeve 24, 24 is preferably in the form of an adhesive bond, a solder joint, or a press fit. The connection between the sleeve 22 and the screw coupling 14 of the screw 21 is likewise carried out. The intermediate shaft 25 of the axially movable key sleeve 37 near the drive is mounted on the bearing 4, which also prevents the axial movement of this shaft. The bearing 4 is rigidly connected to the support 18. The bearing design provides a wear-resistant, reliable operation of the key couplings 37. The intermediate shaft 25 is connected to the plastification 36, a standard quick-release coupling coupling 3, which should align a certain displacement of the axes. Due to the use of the support bearing 4 and the coupling coupling 3, a quick-release plastification drive 36 is obtained. Particularly great accuracy in mounting the drive is not needed, in addition, various variants of its execution are allowed.

A particular advantage of the described construction of the movable key sleeve 37 is that its stroke along the length is measured according to the movements of other movements, the supply and discharge of the injection nozzle 39 and the auger stroke 21 in the plasticization cylinder 16, and the stroke length of the nozzle is usually longer than the auger stroke length 21 The stroke of the nozzle and the screw 21 is carried out without providing additional construction length of the machine.

In this way, various technology and installation requirements are met.

In order to provide movement of the inlet and outlet, the kneading cylinder 16 and the injection cylinder 9 are connected to the support 18 by means of sliding guides. In manufacturing these yushdh directions, high accuracy is required. The coaxiality of the moving elements of the injection unit depends on it, i.e. reliability and durability of the entire machine. Therefore, the connection of the cylinders 16, 9c with the support 18 takes the form of tight, backlash-free sliding guides. The slideways are the two guide tracks 30; Each track 30 has two sliding surfaces of 29 ° and 296,

one

1236982

,eight

five

0

five

moreover, one surface is mounted horizontally. Thus, one support column has four sliding surfaces: three rigid and one pre-elastic to compensate for the change in distance due to temperature expansion. Pre-tensioning is provided by the cupral blue 27. The movement of the entire injection unit relative to the support 18 along the sliding guides is necessary for retracting and supplying the injection nozzle 39, which is a basic requirement of the process technology. In addition, this movement is necessary during installation and repair. The injection unit is advanced by a known method using displacement cylinders 40. The support 18 must have a large opening if it is an oil tank 26. For this, the upper cover plate 28 and both guide tracks 30 are made in a bi-screw cap mounted on screws. This results in the need for an even, flat construction of the sealing bearing surface 41 of the oil tank 26,

to ensure reliable operation of the slide guides. For the same reason, the deviation of the distance between the horizontal guiding surfaces of the slide 29a and the supporting surface 41 should be minimal.

For precise coaxial mounting of all nodes, the surfaces of the slide 29a and 29b are provided with regulating attachments. The simplest method is you,

the leveling of the moving parts consists in the installation of metal sheet gaskets between the bearing elements (for example, post 15, fig. 3) and the sliding surfaces 29a i-i 29c fixed on them. The alignment of the entire injection unit with respect to the assembly is made by moving retaining wedges 31 and 32. They can move one relative to the other and are under the base of the support 18. The injection cylinder 9 is equipped with telescopic pipes 7 and 6 that are parallel to the injection axis next to the injection cylinder 9 on the side where there is

hydraulic unit 19. The movable connecting blocks 5 and 10 are attached directly to the corresponding clamps 6 and 11 of the injection cylinder 9. The fixed connection unit 12 of the hydraulic unit 19 is rigidly connected to the fixed support 18 with the help of the rack 38. In this way, a compact design is obtained with short pipelines

The device works as follows.

In working condition, the kneading cylinder 16 together with the injection cylinder 9 moves towards the locking unit using the displacement cylinders 40. The cylinders 9 and 16 will make only a small stroke when the injection nozzle 39 is fed and retracted to thermally decouple the C1-shinder of the plasticization 16 and the casting forms. In this state, the stroke hd of the secondary key coupling 37 provides movement of the screw 21 during the plasticization of the injection.

In order to completely retract the plasticization cylinder 16 and the injection cylinder 9 of the closing unit for the purpose of mounting or repairing the machine, the screw auger 21 inside the plasticization cylinder 16 first moves to the extreme forward position. Thus, the entire stroke of the movable 1x sleeve 37 can allow the plastic cylinder, AI 16 and the injection cylinder 9 to retract. In the fully retracted state, the cylinder does not have the ability to move the screw 21 in the plasticization cylinder 16, however, such movement is not necessary in this case. In the partially withdrawn condition of the cylinders 16 and 9, the possibility of moving the screw 21 inside the plasticization cylinder 16 is fully preserved as long as the equation

h hd - hs, where h is the path already set aside;

hd - move the movable key sleeve 37;

hs is the maximum stroke of the screw 21 in the plasticization cylinder 16.

Further, the ability to move the screw 21 is limited depending on the stroke length when the plasticizing cylinder 16 is retracted. Thus, depending on the position of the plasticizing cylinder retracted 16, the injection unit function, i.e., is fully or partially retained. You can experiment during installation.

Thus, the key coupling 37 provides movement of the cylinders 16 and 9 and the course of the screw 21, which simplifies the design, improves its reliability while maintaining the same dimensions along the length, and simultaneously simplifies the function and performs a double function.

fig- 3

 g5 7A 33 tt gz gz 9

-TKSH P

J7 i

Editor A. Gulko

Compiled by L. Koltsova

Tehred L. Serdyukova Proofreader A, Zimokosov

Order 4872/14 Edition 640 Subscription

VISH SHI USSR State Committee

for inventions and discoveries 113035, Moscow, F - 35, Raugska nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (5)

1. INJECTION OF INJECTION OF INJECTION MACHINES, containing a support, a hydraulic unit, a plasticizing cylinder with a screw installed in it with a possibility of movement, an injection cylinder mounted together with a gear reducer is mounted on a stand, which is located in line with the support, and the length of the keyway couplings are selected corresponding to the maximum g travel of the plasticization and injection cylinders and exceeding the auger travel. ND SP O » C © OO er 2. A knot according to π.1, about t and h and u, u. The reason is that the injection cylinder is equipped with a sleeve connected at one end to the screw and the other with a keyway sleeve, which is made in the form of an intermediate shaft and covers the sleeve, the sleeve being mounted with the possibility of movement relative to the intermediate shaft. '' 3. The node according to claim 1, characterized in that the supporting surfaces of the upper plate are horizontally in the same plane with the formation of sliding guides made in the form of guide tracks having each one horizontally arranged sliding surface and a lateral sliding surface arranged obliquely to it. 4. The node according to p. 3, characterized in that it is equipped with Belleville springs for tensioning the slide rails. 5. The node according to p.Z. characterized in that the upper plate with slide rails is connected to the support by screws.