RU2143976C1 - Pneumatic moulding machine - Google Patents

Abstract

FIELD: moulding machines. SUBSTANCE: the pneumatic moulding machine has a frame, conveying device, heating device, moulder tool, pressing device with a drive for joining the half-moulds of the moulder tool, devices for length and cross cutting. The device for length cutting is located behind the moulder tool, kinematically linked with the conveying device and made for adjusting the distance of cutting, and the device for cross cutting is mounted behind the device for length cutting. The device for length cutting is made in the form of spring-loaded blades that are installed for movement in axial direction with the aid of sliding keys and fixing with the aid of nuts on the shaft kinematically linked with the shaft of the conveying device. The device for cross cutting is made in the form of blades installed from above and below of the conveying assembly and rigidly coupled to the fixed parts of the pressing device. The arrangement and inter- relation of cutting device in the pneumatic moulding machine with the other members of the construction provides for quick readjustment to standard sizes of products. EFFECT: enhanced efficiency. 3 cl, 2 dwg

Description

 The invention relates to the field of plastic processing by thermoforming from sheet materials and can be used, in particular, for the manufacture of corrections.

 Known pneumatic molding machines containing a bed, a conveying device, a heating device, a press unit, a forming tool and a protective fence. The sheet material is fed by the conveying device to the heating device, where the material is heated to a plastic state, after which the heated film by the conveying device is fed into an open form. After closing the half-molds of the forming tool, the product is formed. Further, the half-forms open and the product is pushed out (JP N 1-58061, IPC B 29 C 51/08, 1989).

 After the completion of the molding technological cycle, the finished product must be separated from the residual material. For this, additional cutting devices are used (EP N 0325036, IPC B 29 C 51/44, 1990).

 Known machines similar to the above (SU N 1466947, IPC B 29 C 51/08, 1989, DE NN 3821921, 3823189, IPC B 29 C 51/08, 1990), in which the molding operation is combined with the separation of finished products in the forming tool, which greatly complicates the latter.

 The closest in technical essence to the proposed one is the technical solution disclosed in the book of V.K. Zavgorodniy, Mechanization and automation of plastic processing, -M. , Engineering, 1970, pp. 281,283, selected as a prototype. In accordance with this technical solution, the blow molding machine comprises a bed, a transporting device, a heating device, a forming tool, a press unit with a mechanical drive for closing the half-forms of the forming tool, a pneumatic drive for controlling the drawing mandrels and a forming tool, in which molding and separation (cutting) operations are combined finished products.

 However, as mentioned above, such a technical solution leads to a significant complication and, consequently, a rise in the cost of the forming tool, and therefore it is economically impractical and cannot be used in conditions of a large assortment and small batches of manufactured products.

 The basis of the invention is the task in a pneumatic molding machine by re-positioning the longitudinal and transverse cutting devices behind the forming tool, their new relationship in the pneumatic molding machine and introducing the ability to control the cutting distance of both devices to allow readjustment to different product sizes, to expand the range of manufactured products while improving manufacturability and simplify the design and reduce the cost of the machine as a whole.

 The problem is solved in a pneumatic molding machine containing a bed, a transporting device, a heating device with lower and upper heating sections, a forming tool, a press unit with a drive for closing the half-forms of the forming tool and a pneumatic drive for controlling the pulling mandrels, a longitudinal cutting device and a transverse cutting device, that, according to the invention, the slitting device is located behind the forming tool, kinematically connected with the conveying device and ying with the possibility of adjusting the distance of cutting, and the device is pre-assembled transverse cutting device for slitting.

 Such an arrangement of longitudinal and transverse cutting devices and their relationship with other elements of the pneumatic forming machine, namely with the conveying device, make it possible to quickly change the cutting distance to different product sizes with a fairly high technological and economical design of the machine as a whole.

 To control the cutting distance, the longitudinal cutting device is made in the form of spring-loaded circular knives, which are mounted with the possibility of axial movement using sliding keys and fixing with nuts on the shaft kinematically connected with the shaft of the conveying device.

 In an embodiment, the transverse cutting device is made in the form of knives mounted above and below the conveying device, and rigidly connected with the stationary parts of the press unit.

 The causal relationship between the totality of the features of the invention and the technical result that is achieved by the invention is due to the fact that the longitudinal and transverse cutting devices removed from the pneumoforming zone of the products and their connection with the conveying device and the press assembly not only reduces the cost and increases the manufacturability of the forming tool, but also makes more technologically and economically the performance of cutting devices with the possibility of readjustment to different product sizes, consistent with the process of pneumatic molds Nia.

 An example of a specific implementation is a pneumatic molding machine, which is used for the manufacture of corrections.

 This machine is shown in figures 1 and 2.

FIG. 1 is a schematic illustration of a pneumoforming machine, general view;
FIG. 2 - section AA, which shows a slitting device.

 As an invention, a pneumatic molding machine is claimed, for example for manufacturing corrections (Fig. 1), comprising a frame 1, on which a conveying device 2 is installed, which includes shafts 3, 4, a needle chain 5 mounted on a frame 6 (Fig. 2) and equipped with a pneumatic actuator, which consists of a pneumatic cylinder 7, a gear rack 8 and a compression sleeve 9. In the area of the conveying device 2, a heating device 10 is installed, which consists of two sections - the upper and lower.

 Behind the heating device 10 is a press unit 11, on the supporting plates of which the mold half-molds 13 of the molding tool 14 are installed. The press assembly 11 is equipped with a mechanical drive 15 for closing the half-molds 13 of the molding tool 14 installed in its lower part. In the upper part of the press unit 11, a pneumatic cylinder 16 of the pneumatic drive for controlling the mandrels 17 of the mechanical drawing of the material (film) is installed.

 On the frame 6 of the transporting device 2, a longitudinal cutting device 18 is mounted (FIG. 2), which consists of spring-loaded disk knives 19, the shafts 20 of which are kinematically connected by gears 21 and 22 and the shaft 4 with a needle chain 5 of the transporting device 2. Disk knives 19 made with the possibility of axial movement using the sliding keys 23 and fixing on the shafts 20 during readjustment to a new product width using nuts 24 and springs 25.

 Behind the slitting device 18, a transverse cutting device 26 is installed (Fig. 1), rigidly connected with the stationary parts of the press unit 11. The transverse cutting device 26 consists of counter-directed knives 27, mounted on brackets 28 mounted on the fixed parts of the press unit 11.

 It is clear that the specific implementation of the devices of longitudinal and transverse cutting is not limited to the above. Other design solutions are possible. However, it is their location and relationship with the transporting device with the possibility of quick changeover to different product sizes that ensure the task and significantly increase the manufacturability of the machine as a whole in the manufacture of products of different sizes and avoids its unreasonable complication and cost.

 Pneumoforming machine operates as follows.

 The operation of the conveying device 2 is synchronized with the mechanical drive 15 of the press unit 11. The film 29 (Fig. 1) is loaded into the conveying device 2; when the half-molds 13 are opened, the pneumatic cylinder 7 is turned on and with the help of a gear rack 8 and a compression sleeve 9, the forces from the pneumatic cylinder 7 are transmitted to the needle chain 5. The film 29 is stretched one step into the zone between the upper and lower sections of the heating device 10; further, during the same subsequent beat, the film 29 in the plastic state at the time of opening of the half-molds 13 is fed into the forming zone. The pitch of the film feed 29 is adjustable. At the moment of closing the half-molds 13, the pneumatic cylinder 7 starts to move downward and the heated film 29 is preliminarily drawn by the mandrels 17, and then, when the mandrels 17 reach the lower position, the air supply to the forming cavity between the half-molds 13 from the mandrels 17 is turned on, at this time the product is formed. Next, the molded product during the next working cycle is carried out from the forming zone to the separation (cutting) zone. In this zone, longitudinal cutting is first carried out by circular knives 19 simultaneously with the transport of the film 29.

 Disk knives 19 (figure 2) using sliding dowels 23 are axially shifted on the shafts 20 and are fixed to the new product width using nuts 24 and springs 25.

 Next, the semi-finished product enters the transverse cutting device 26, where the transverse cutting is carried out (Fig. 1). The cutting step of the device 26 is consistent with the required size of the product in the molding tool 14.

 It is clear that the pneumatic molding machine can be used not only for molding corrections of various sizes, but also for other products from plastic material, depending on the forming surfaces of the molding tool.

 The location and interconnection of cutting devices, as mentioned above, with the most technologically advanced execution of the machine as a whole significantly expand its capabilities in a rapidly changing assortment depending on the needs of industry and consumers with the most economical and expedient implementation.

Claims (3)

 1. Pneumatic forming machine containing a bed, a transporting device, a heating device, a forming tool, a press unit with a drive for closing half-forms of a forming tool, a longitudinal cutting device located behind the forming tool, and a transverse cutting device, characterized in that the longitudinal cutting device is kinematically connected with transporting device and is configured to control the cutting distance, and the transverse cutting device is mounted behind the longitudinal cutting device .  2. The machine according to claim 1, characterized in that the slitting device is made in the form of spring-loaded disk knives, which are mounted with the possibility of axial movement using sliding keys and fixing with nuts on a shaft kinematically connected with the shaft of the conveying device.  3. The machine according to p. 1 or 2, characterized in that the transverse cutting device is made in the form of knives mounted above and below the transport unit and rigidly connected with the stationary parts of the press unit.

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