Device for pressing shell blanks

FIELD: wood working industry.

SUBSTANCE: device comprises die mounted on the base and pressing unit mounted on the traverse, which can move vertically with the actuating mechanism of the press and interacts with the article blank inside the die, and pivoting-rod unit mounted on the traverse and made of two pivotally interconnected sides provided with pivoting supports for the rods connected with the traverse. The rods form groups arranged along the traverse. Each of the groups is made of a vertical rod secured to the traverse and a pair of rods inclined to the vertical and pivotally connected with the traverse. The bottom section of the vertical rods is pivotally connected with the sides through a pair of the rods forming a gentle angle between them. The common pivot is mounted on the vertical rod for permitting slight movement over the vertical to change simultaneously their total length during operation. The vertical rods are sectional and interconnected via a screw junction that allows the total length of each vertical rod to be changed individually.

EFFECT: enhanced quality of pressing.

1 cl, 5 dwg

 

The present invention relates to a device for pressing articles of wood-fibre mixtures, in particular of workpieces shell in the form of thin (5-6 mm) curved in cross section of products with a semi-cylindrical surfaces.

The known device is stacked presses for molding products from these mixtures, containing flat metal plate, can be used on the first stage of compression, in which the mixture is compacted to the condition that, without mechanical damage to put it in a pan with a semi-cylindrical configuration of the surface.

A device for pressing wood carpet, comprising a frame, a closed upper and lower pressing the tape guides and the actuator, which is provided above the upper conveyor belt mechanism of the uniform distribution on the carpet. This mechanism is made with continuous rows of rollers (11 and 12)that are installed with the inner sides of the working of the branches of the conveyor belts, and a drive Cam profile of the Cam (16) and interacts with the host (13) and driven rollers (14 and l5) and base plate with adjustable along the length of the rods, which at one end radially fixed with base plate (17)and the other with the guide rail (4) ...(see the description of the auth. the certificate of the USSR No. 1595641 A1, 27 N 3/08, published the. 30.09.90. Bull. No. 36).

This device does not provide sufficient reliability when pressing with a high degree of compaction (at high pressure to the surface “wood carpet”. A weak point of the device is the presence of excessively large contact stresses of metal where the interaction of the roller 13 with the Cam 16 and the rollers 14 and 15.

The known device is characterized by great complexity and lack in the manufacture compared with the widely known presses with flat plates. This raises doubts about the appropriateness of the use, because after pressing depicts the output of "carpet" flat again.

A significant drawback of the known device is the following.

When the device, in which in the process of pressing the wall thickness of the semi-cylindrical articles is reduced, for example, two or three times, and the configuration of the working surface of the press elements, interacting with the product remains unchanged, it is impossible to get a quality product. The side parts of the product during the extrusion will experience more shear than compression. This will lead to uneven density and the difference in the physical properties (strength properties) in the Central area, within the arc of a circle 60-90°and at the edges of the product, near the longitudinal edges.

The essential substance of the diamonds of the present invention is that the device, includes installed on the frame of the press matrix and mounted in the guide pressing the node that is moved vertically by power mechanism of the press and interacting with placed in the matrix preparation of the product performed as follows.

The device is equipped with a hinge-rod plunger hub mounted on the traverse and is made in the form of two articulated between a side attached to them articulated supports long rods. Rods node form spaced along the traverse group, each of which is made of a vertical rod attached to the traverse, and a pair of rods placed inclined to the vertical and articulated with traverse hinge. Thus the bottom part of the vertical rod pivotally connected to the side walls of the inclined rods with the possibility of changing the total length of the rod. This provides an alternate switching energy pressing the Central part of the unit on a side part thereof, and Vice versa, with the side parts at the Central part of the product.

1 shows a device for pressing, a view along the axis of the compression of the workpiece; figure 2 - section a-a in figure 1; figure 3 is a cross-section B-B in figure 2; figure 4 shows a vertical rod with a screw joint; figure 5 - a section b-b In figure 4.

The device contains is it installed on the base frame 1, fixed on the matrix 2 with semi-cylindrical working surface, and the yoke 3 is fixed on the rod 4 connected with the power mechanism (not shown).

In the working position in the matrix posted by procurement of compressible articles 5, placed in trays 6 and 7. Pallets made in the form of thin metal sheets, curved on the arc of a circle 180°. The upper tray 7 is made of two parts connected by a thin, elastic steel tape (not shown).

The device is equipped with a plunger, hinge-core node 8, the working surface which interacts with the pressing surface of the pallet 7. This site is made in the form interconnected by hinges 9 of arcuate side walls 10 forming at the final stage of pressing the semi-cylindrical convex surface. On each side is fixed pivot bearing 11 and 12 for the rods. Rods node 8 form spaced along the traverse group 13, each of which is made of a single vertical rod 14 and a pair of rods 15. A vertical rod mounted on the cross beam and connected on swivel bearings 11 of the side walls by a pair of rods 16, placed obliquely to the Central angle between the rods approximately 20°. Total for the pair of hinge rods 17 are made in the form of a Cam that allows you turn it on 18° to change the overall length of the rod. The rotation is performed using a fixed on the axis of the hinge arm 18, is equipped with it screw clamp 19.

The axis of the hinges 17 kinematically connected with the shaft (or shafts 20 and coupling 21.

Near vertical rod group on traverse fixed pivot 22 for the pair of rods 15, the lower ends of which are pivotally connected to the supports 12 of the side walls. The rods 15 are placed obliquely to the Central angle between 90-100°.

To ensure the order of interaction of the rods 14 and 15 with the side walls during rotation of the hinge Cam disc 17 and the lower holes in the rods is made in the form of grooves.

On the rods 15 attached the hooks 23 for springs 24, bringing the upper part of the sidewalls and the vertical plane of symmetry of the pressure node.

On the working surface of the die, near the ends of the pallets fixed Central and lateral lugs 25, which interact with the side walls at the end of the stroke when the desired wall thickness of the product.

To expand the technical capabilities of the device and ensure uniform loading of all rods node 8 of the upper and lower parts of the rods 14 are interconnected by means of a screw joint. This joint is made in the form of a screw rod 26 and sleeve 27, which is made with the shoulder and the mouth is attached to the upper part 28 of the rod 14 to rotate. The sleeve 27 is adjacent to the mounted on the tubular rod 28 of the sleeve 29, which is made with a flange and connected to the sleeve 27 split collar 30.

Device for pressing workpieces shell works as follows.

In the initial position before pressing the traverse with the pressure node is located in the extreme upper position, the package pallets of product blank is installed in the matrix between the stops 25 and the rods 14, the maximum elongated rotation of the hinge Cam disc 17 into position.

Switching mechanism presses down the site prior to its contact with the upper pallet and increasing the pressing force, compress the billet products. At the initial stage of compression is exposed to the Central part of the billet, as work to compress only the rods 14. Then according to the technological regime pressing the pressure buildup on the workpiece through the rods 14 cease and the swivel-eccentric reduce the length of the rods, i.e. transform them into non-operating position. When you turn the power mechanism work to compress the workpiece only a pair of rods 15. This is because under the influence of forces transmitted traverse rods 15, the sidewalls 10 are rotated around the hinges 9 and compress the sides of the billet to a greater extent than the Central part.

After vyravnivanie the thickness in the Central and lateral parts of the workpiece to produce the re-elongation of the rods 14, and further the process of pressing the workpiece proceeds as described above.

At the final stage of compression of the Central and side parts of the side walls 10 are in contact with all the stops 25, which indicates the achievement of the desired wall thickness over the entire surface of the product.

If there is to be non-simultaneous contacting work surfaces and sidewalls with stops 25 located on opposite ends of the matrix, the alignment of the wall thickness at both ends use the tuning control the length of one of the rods 14, which is achieved by rotation of the sleeve 27.

After climbing site in the off position and remove from the matrix package pallets it install another package with the workpiece and produce extrusion, as described above.

The source of information

Auth. the certificate of the USSR 1595641 A1, CL 27 N 3/08, published. 30.09.1990. Bull. No. 36.

1. Device for pressing workpieces shell containing installed on the frame of the press die with a concave semi-cylindrical working surface, mounted on the lower side of the bar pressing the node that is moved in the guide rails vertical power mechanism of the device and interacting with placed in the matrix product blank, characterized in that the device has articulated the core node is executed in the form of two pivotally interconnected arcuate sidewalls attached to them articulated supports for rods, forming spaced along the longitudinal axis of the billet groups, each of which is made of a vertical rod attached to cross beam and pivotally connected to the side walls by a pair of rods, and a pair of inclined to the vertical rods, articulated with the head plate and sidewalls, with the constituent elements of the vertical rods are connected with the possibility of changing the total length of the rods.

2. The device according to claim 1, characterized in that the connecting elements of the vertical rods is made in the form of a hinge-eccentrics with simultaneous change of the total length of the rods and screw coupling elements with the possibility of changing the length of each vertical rod separately.



 

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