JPS6356830B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a sieving machine as defined in the preamble of claim 1.

The fact that the rods holding the stabbing pieces and the rocking levers are supported rotatably around a longitudinal axis in the sieving box and that these rotating support pieces are constructed as rubber torsion pressure springs is disclosed in German Patent No.
It is known from the specification No. 2016199. Furthermore, each rod can be vibrated by means of an electromagnetic drive, but this results in relatively high production costs.

Furthermore, sieving machines are known in which the swing levers of all the rods holding the stab strips are connected via a common push rod, which push rod can be vibrated via a single vibrator. An electrically drivable crank transmission is provided as the vibrator, and a connecting rod of the crank transmission is pivotally connected to the push rod.

In this case, compared to the sieving machine according to German Patent No. 2016199, the number of vibrators required is significantly reduced and thus also the manufacturing costs are reduced, but nevertheless, in any case Also requires an articulated connecting rod, i.e. to be able to cancel out the vertical vibrations of the push rod that inevitably occur during the reciprocating oscillation of the oscillating lever, and an electrically driveable crank transmission. This is also necessary if an electromagnetic drive has to be provided as a vibrator instead of the vibrator.

Furthermore, these known screening machines have the following drawbacks. That is, by means of the rods provided below the sifting fabric surface and the rotating support pieces of these rods fixedly held on the pedestal, the protruding pieces are inclined with respect to the sifting fabric surface and hit the sifting fabric surface, In this case, it is moved along the surface of the sieving fabric with frictional contact, resulting in considerable wear of the sieving fabric.

The problem of the present invention is to improve the sieving machine as described in the preamble of claim 1,
The present invention consists in that all rods holding the tabs can be driven by a common vibrator via a common push rod. The production is improved by maintaining the advantages already obtained in the prior art and also by better adapting the sieving machine to the sieving characteristics of the respective sieving material, at least by maintaining quiet operation and reducing wear. The goal is to make it even simpler and cheaper.

The solution to this problem has the following characteristics. That is, the rod holding the protrusion piece is supported in the region of both ends by a vertically elongated metal flexure spring which is provided along the surface of the sifting fabric and is arranged at least approximately at the same height as the surface of the sifting fabric; One end of these flexure springs is attached to the screening box, the other free end is attached to the bar, and as a vibrator an electromagnetic spring acts linearly on the push bar and is adjustable in frequency and amplitude. A vibrator is provided.

By this means the screened fabric surface is protected to a degree hitherto unreachable. This is because the swing axis of the rod that holds the stabbing pieces can be installed at the same height as the sieving fabric surface using a simple, trouble-free, and maintenance-free bending spring.
This is because the sifting strips are oriented approximately at right angles to the sieving fabric surface during their impact, impinging on this sieving fabric surface and thereby avoiding abrasive lateral components that would promote wear of the sieving fabric surface. .

Furthermore, the elastic holding piece of the rod that holds the thrust piece is
The omission of the hitherto necessary connecting rods makes it possible to connect the vibrator and the push rod directly, which greatly simplifies the production, and also because of the aforementioned flexure spring, the rotary support piece is configured as a rubber torsion push spring. A larger spring stroke is also obtained in the vertical direction, so that vertical vibrations of the push rod can be canceled out. Furthermore, the separation effect is increased by the abutment perpendicular to the sieving fabric surface and, if necessary, a possible variation of the frequency and/or amplitude, and the risk of clogging of the sieving fabric surface by the sieving material is also significantly reduced. be done. Furthermore, electromagnetic drives are cheaper than crank transmissions that can be driven by electric motors.

In this case, it is advantageous if the free end of the flexure spring, which serves for the attachment of the rod, faces towards the sifting material input on the sifting fabric surface.

In particular, an arrangement which further improves the quiet operation of the sieving machine described above is that the rod is connected to the push rod via a rocking lever by a metal flexure spring which is attached to the push rod on the one hand and to the rocking lever on the other hand. It consists in being.

For this purpose, a preferred and advantageous embodiment in the sense of the subject is that at the free end of each rocking lever on the push rod side, at least one swivel lever is oriented at right angles to the longitudinal extension of this rocking lever. a generally linear flexure spring is retained approximately in the center of the longitudinal extension;
each flexure spring is held on the push rod with its ends oriented approximately in the same direction as the longitudinal extension of the push rod, preferably with one end of the flexure spring fixedly attached to the push rod; Preferably, the other end is supported so as to be movable in the vertical direction.

This makes it possible to dispense with rotary joints, which hitherto were considered necessary and which are subject to wear, especially due to the sieving material, and which, due to the widening of the support piece clearance caused by wear, can be omitted in the sieving machine. make the noise level higher and higher.

In order to relieve the load of the above-mentioned flexure springs serving the movable connection of the push rod and the rocking lever, it is advantageous to support the push rod on the frame by means of a guide piece oriented in approximately the same direction as the rocking lever. Preferably, these guide pieces have approximately the same effective length as the rocking lever.

The guide piece is constructed as a flexible rod which is attached to the frame on the one hand and to the push rod on the other hand and is oriented at right angles to the longitudinal extension of the push rod.

A further advantageous embodiment of the above-mentioned object, in which the superposition of vibrations on the sifting fabric surface which would impair the sifting process is largely prevented, is that the push rod is fixedly held in the frame by a linear guide, which prevents this push. This consists in that the rod is movably supported only in the direction of its longitudinal extension.

An embodiment of the invention is shown in the drawing and will be explained in detail below.

This sifting machine includes a rectangular sifting box 1 in which a sifting fabric surface 2 of approximately the same area is held exchangeably, so that the short edges of this sifting fabric surface are The tightening mechanism 3 is provided in a tightening mechanism 3 extending parallel to the short side of the holder.

In the position of use, the sieving box 1 and the sieving fabric surface 2 are provided with an inclination to the left.
A sieved material inlet hopper can be provided above the upper right sieving box end, and a sieved material outlet, not shown, must be provided at the lower end of the sieving box 1 and below the sieving fabric surface 2.

In the sifting box 1, below the sifting fabric surface 2, a plurality of bars are oriented at right angles to the feeding direction of the sifting material and to the longitudinal extension of the sifting box 1 and extend parallel to the sifting fabric surface 2. 4 is supported. All bars 4 are fitted with a plurality of laterally supported shock levers 5 which are distributed over the entire length of these bars and which are connected to the sifting fabric surface 2.
It holds a protruding piece 6 that can come into contact with the lower surface of. These tabs can be configured as strips that can extend over substantially the entire width of the sieving fabric surface 2.

Each bar 4 is provided with another laterally supported rocking lever 7, this rocking lever pointing downwards. All the swing levers 7 of the rods 4 are pivotally connected to a common push rod 8. Push rod 8 is sieving box 1
It is provided to extend along the push rod 8
The sifted material inlet side end of is connected via a leaf spring 9 to a vibrating armature of an electromagnetic drive device 10 held in the sifting box and acting in the direction of the push rod 8, and the vibration frequency of this armature is and/or the amplitude can be selectively varied during operation by means of well-known electrical controls.

Each rod 4 is supported in the sieving box 1 in the region of both ends by an elongated steel flexure spring 101 which is provided along the plane of the sieving fabric and is arranged at least approximately at the same height as the plane of the sieving fabric. Each of these flexure springs is attached at one end to the screening box 1 and at its other free end to the rod 4. In this case, the free end of the flexure spring 101, which serves for the attachment of the rod 4, is directed towards the sifting material input of the sifting fabric surface 2. A steel flexure spring 102 is used to movably connect the push rod 8 with the rocking lever 7.
is provided. These flexure springs are each arranged to extend at right angles to the oscillating lever 7 and parallel to the push rod 8 , each of these oscillating levers 7 being approximately at the center of the longitudinal extension of the flexure spring 102 . are provided to engage these flexure springs at. The end of the flexure spring 102 is attached to the push rod 8. However, each flexure spring 102 can only be attached at one end to the push rod 8, the other end of which is guided in a movable manner along the push rod. Further, the push rod 8 is suspended from a guide piece 103. These guide pieces 103 are oriented in substantially the same direction as the swing lever 7 and have substantially the same effective length as the swing lever 7. The upper ends of the guide pieces 103 are attached to columns 104, which are attached to the sieving box 1 facing in the same direction as the longitudinal extension of the sieving box 1. Further information piece 1
03 are constructed as flexible rods, the ends of which are fixed to the struts 104 or push rods 8. The flexure spring 101 can also be provided outside the sieving box 1, for which purpose a cutout must also be provided in the side wall of the sifting box 1, through which the rod 4 can pass. In any case,
Advantageously, these recesses are closed by flexible sealing pieces. In some cases, it may be advantageous to provide the push rod 8 also outside the sieving box 1. Flexure springs 101 and 102 can be constructed as single-layer or multi-layer leaf springs.

All new individual features and combinations of features disclosed in this specification and/or drawings are considered essential to the invention.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the sieving machine, and FIG. 2 is a plan view of the sieving machine. 2... Screening fabric surface, 4... Rod, 6... Push piece, 8... Push rod, 10... Vibrator, 101...
...bending spring.

Claims (1)

[Claims] 1. A sifting box having at least one sifting fabric surface inclined from a sifting material inlet to a sifting material outlet; Direct excitation is possible by means of protruding pieces distributed over the entire surface of the sieving fabric and vibrating up and down, and these protruding pieces are held by impact levers provided below the surface of the sieving fabric. These impact levers are grouped together and supported on rods held on a pedestal and oriented at right angles to the feed direction of the sieved material, these rods having swing levers, which swing levers In a sieving machine in which the sifting fabric surface 2 can be vibrated by means of a vibrator on a common push rod, a bar 4 carrying the sifting strips 6 is provided in the region of both ends along the sifting fabric surface 2 and this sifting fabric surface supported by elongated metal flexure springs 101 arranged at least approximately at the same height as , one end of these flexure springs 101 is attached to the screening box and the other free end is attached to the bar 4; A sieving machine characterized in that an electromagnetic vibrator 10 is provided as a vibrator, which acts linearly on the push rod 8 and whose frequency and amplitude can be adjusted. 2. Screening machine according to claim 1, characterized in that the free end of the flexure spring 101 serving for the attachment of the rod 4 is directed towards the sifting material charge of the sifting fabric surface 2. 3 Patent, characterized in that the rod 4 is connected to the push rod 8 via a swing lever 7 by a metal flexure spring 102 which is attached to the push rod 8 on the one hand and to the swing lever 7 on the other hand. Claim 1
or the sieving machine described in paragraph 2. 4 At the free end of each pivoting lever 7 on the push rod 8 side, at least one substantially linear flexure spring 102 oriented perpendicularly to the longitudinal extension of this Claim 3, characterized in that each flexure spring 102 is held centrally and held on the push rod with both ends oriented substantially in the same direction as the longitudinal extension of the push rod. sieving machine. 5. According to claim 4, one end of the bending spring 102 is fixedly attached to the push rod 8, and the other end is supported so as to be movable in the vertical direction. sieving machine. 6. According to one of claims 1 to 5, the push rod 8 is supported by a pedestal by a guide piece 103 oriented in substantially the same direction as the swing lever 7. sieving machine. 7. The sieving machine according to claim 6, wherein the guide piece 103 has approximately the same effective length as the swing lever 7. 8. The guide piece 103 is constructed as a flexible rod which is attached on the one hand to the frame and on the other hand to the push rod 8 and is oriented at right angles to the longitudinal extension of this push rod. A sieving machine according to scope 6 or 7. 9. Claim 1, characterized in that the push rod 8 is supported so as to be movable only in the direction of the vertically extending portion of the push rod by a linear guide portion fixedly held on the frame. Items 1 to 8
The sieving machine described in .