JPS586579B2 - Yukagoushi no Seizouhouhou Oyobi Sonosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a floor lattice consisting of longitudinal strips standing on their edges relative to the lattice plane and crossbars welded to the strips.

More particularly, the invention relates to a method in which a strip is longitudinally advanced through a welding station where crossbars are successively placed across and welded to the longitudinal strip.

In existing plants operating in this way, steel strips with the same cross-sectional area as the longitudinal strips of the grid are advanced from the coil to the shearer, which cuts the steel strips into sections of the same length. disconnected.

The strip sections are placed one after another on the carrier to form an array of parallel strips standing on the edges.

The carrier is moved to a position in front of the welding station such that each piece of the group is advanced to the welding station.

In the improved method according to the invention, a sheet 2 having an overall width corresponding to the overall width of all the strips in the longitudinal direction of the grid is gradually unwound from one or more coils of strip material; A mat of continuous strips is formed which are advanced in parallel.

The flat surfaces of the strips are parallel to the plane of the mat, and each strip is twisted into an edge position relative to the plane of the mat sequentially before entering the welding station.

This method offers several important advantages.

cutting the strip material into sections of a predetermined length (which must be equal to the length of the finished grid or an integral multiple thereof to avoid loss of material); It is no longer necessary to place the carrier on top and move the carrier to and from the operating position in front of the welding station.

The strip material is fed in a continuous flow to the welding station,
Therefore, the capacity can be fully utilized.

The amount of material contained within the coil is sufficient for long-term continuous operation, for example several hours of operation.

The strip material is provided, for example, as a number of coils equal to the number of strips of the grid to be trimmed, each coil comprising strips of the same cross-sectional area as the strips of the grid.

In a preferred embodiment of the invention, the required strip material is provided in the form of a single coiled sheet or wide strip, which, during its advancement, provides the necessary narrow width for the grid. It is divided into a number of strips.

The invention also includes an apparatus for carrying out the above method, comprising a welding station having means for advancing a group of parallel strips in sequence, the flat surfaces of the strips facing each other, and Means are included for successively disposing and welding the crossbars on said group of parallel strips, and means for feeding said strips to a welding station.

According to the invention, the means for feeding the strips to the welding station comprises a rotatably supported coiled strip or sheet material having an overall width sufficient to simultaneously draw material to all of the strips in the group. equipment, means for conveying a continuous length of material from the equipment to a welding station, the continuous length of material being arranged into a mat of parallel strips having a flat surface parallel to the plane of the mat; and guiding means for twisting each strip of the mat into a raised position.

In a preferred embodiment of the device, shearing means are provided which are arranged to divide a sheet or wide strip provided by a single coil fixture into a plurality of strips of the required width.

Embodiments of the invention will now be described in detail with reference to the drawings.

The floor lattice to be manufactured in FIG. 1 consists of support bars 1 and cross bars 2.

The support rods 1 are steel strips that stand on their edges against the plane of the grid.

The cross bar 2 usually has a circular or square cross section and is connected to the support rod by welding and pressing operations, respectively, where the cross rod is pressed into the support rod so that it lies in the same plane as the support rod.

To increase strength, the grid may be provided with crossbars on both sides.

The finished grid usually has an angular or grooved iron frame.

The equipment shown in FIGS. 2 and 3 is a strip feed station 3, a straightening table 4, a dividing mechanism 5 in combination with a strip advancement mechanism 6, a feed table 7, a pit 8, an upright table 9, a welding station 10. , a cutting station 11 and a roller table 12 with an overhead crane 13.

The strip feed station has two conveyors 14, 15 which can be moved laterally along a common track 18.

Each carrier consists of a coil 16 of sheet or wide strip material having a width slightly exceeding the total width of all the pieces of the grid to be manufactured.
17 is rotatably supported.

Each coil is large enough to last for extended periods of equipment operation, preferably several hours or a full day of operation.

As soon as the coil is used up, its carrier moves onto track 18
, and another carrier carrying the new coil is moved into the operating position.

An advancing mechanism 6 sequentially moves the sheet or strip of material into a coil 16.
It is untangled and pulled through guide and straightening rolls 19, 20, 21 provided on the straightening table 4.

A pair of horizontal rolls 22 mounted on the table 4 primarily serve to keep the sheet material at the correct height as it passes the straightening rolls 19, 20, 21.

Leaving the advancing mechanism 6, the material enters a dividing mechanism 5 consisting of a set of rotating shears 23.

This divides the sheet or wide strip into the required number of narrow strips of equal width and also cleans the edges of the sheet.

These parts are wound on a fragment reel 26 (FIG. 3).

Guide rolls 24, 25 are provided to control the transfer of the edge strips from the shears 23 to the fragment reel.

The other strip slides along the feed table 7, the rear end 7a of the table being the part of the strip supported by the table 7;
It is curved downward to provide smooth movement between the rear end 7a of the feeding table 7 and a corresponding curved lip member 42 provided above the other end of the pit 8.

A hanging strip section with a length that can vary within a certain range comprises a strip section to the left of the pit 8 which is advanced at a constant speed and a pit 8 which is propelled forward by the advancing mechanism of the welding station. Acts as a buffer or interference remover between the right strip section of the

The strip pulled forward from the curved lip 42 under the action of the advance mechanism of the welding station is first engaged by a pair of brake blocks 31 and, on exiting between the brake blocks, by a pair of horizontal guide rolls. 32.

The advancing group of strips here constitutes a mat or planar arrangement, the planes of which are parallel to the flat sides of the strips.

A spacing member 34 (fourth a
, 4b) are provided.

During its passage along the upright table 9, each strip is moved by a pair of vertical guide rolls 33 (4a, 4) that engage the flat surface of the strip.
b) is progressively twisted through an angle of 90° into a position on the edge.

The distance between the horizontal guide roll 32 and the vertical guide roll 33 is sufficient to ensure that the thread of the strip does not undergo permanent deformation.

The strip thus assumes its planar shape once it leaves the guide roll 33.

The welding station is equipped with a supply 35 of cross rods cut to length and means for feeding one cross rod at a time through a chute 36 to the welding position.

Two crossbars are welded to the strips at a time.

Advancement of the strips and welded grid is accomplished by a pair of pawls actuated by a fluid cylinder 37, which are arranged to engage the crossbars of the welded grid.

This mechanism, along with the construction of welding electrodes, etc., is well known and does not require further explanation.

The cutting station 11 has shearing means 38 by means of which the continuous length grid produced by the welding machine is cut into sections of desired length.

The cut parts are gradually moved to the rear of the roller table 12 and removed by the overhead crane 13.

As previously mentioned, the strip section or loop suspended above the bottom of the pit 8 absorbs the difference between the continuous advance made by the advancement mechanism 6 and the incremental advance made by the welding machine. do the work.

This loop exhibits not only periodic oscillations corresponding to the operating cycle of the stepwise advance mechanism of the welding machine, but also oscillations due to the unavoidable difference between the advance speed of the mechanism 6 and the average advance speed provided by the welding machine.

In order to ensure that this loop does not fall below the minimum value indicated by line 29 (FIG. 2) nor exceed the maximum value indicated by line 30, monitoring means 27.39 and 2.
8.40 is configured to generate a signal when the loop deviates from the range defined by the upper and lower limits.

Each monitoring means consists of a tactile member 27, 28 arranged to be actuated by a loop and a signal device 39, 40 actuated by the tactile member.

Preferably, the signals generated by the signaling device are used to automatically adjust the forward speed of the mechanism 6 in such a direction that the loop is within an acceptable range.

Alternatively, a signal may be used to activate an alarm to alert the operator that the forward speed of mechanism 6 requires adjustment.

To facilitate the introduction of material from a new coil into the welding station, platform 41, normally in an inactive position next to pit 8 (FIG. 3), is moved to a position above the pit.

The top surface of the table is in the same plane as the surface of the feeding table 7 or slightly below it.

The advancement mechanism 6 is used to push the strip forward along the feed table 7, platform 41 and upright table 9 into the welding machine.

As soon as the first pair of crossbars are welded, the platform 41 is returned to the inactive position and the equipment operates in the normal manner described above.

Alternatively, the new sheet and the used sheet may be joined end to end by welding.

In that case, the stand 41 is of course redundant.

Although it is preferred to operate the installation with a single coiled sheet or wide strip of material as described above, it is also possible to use multiple coils of strips of the required dimensions for the grid.

The coils may rotate about a common horizontal axis or about individual horizontal axes.

In that case, the cutting station 5 would of course be redundant.

In the installation described with respect to figures 1 to 4b, the guide roll 33, which serves to twist the strip into the raised position, is supported stationary by an axis in the upright table 9.

When the front ends of the group of strips emanating from the new coil of material are pushed forward by the advancement mechanism 6 and reach the guide rolls 33, they are fitted with special gripping tools in order to be able to enter the vertical spacing between the rolls 33. twisted into position on the edge.

Figures 53 and 5b show a variation of the guide member that obviates manual twisting movements.

The guide fingers 52,53 correspond to the guide rolls of FIGS. 4a and 4b.

In the operating position shown in FIG. 5b, each pair of guide fingers 52,53 defines a guide groove 54 or vertical spacing for the strip 51.

In the above position, the guide finger has the same function as the guide roll 33.

However, the guide members 52, 53 are displaced relative to each other in a direction parallel to the groove of the guide groove 54 and at right angles to the direction of advancement of the strip from the operating position of FIG. 5b to the inoperative or extended position of FIG. 5a. is mounted so that the guide fingers 52 . The spacing of 53 exceeds the thickness of the strip.

When a set of strips provided by a new coil of material is passing through the installation, the guide fingers 52, 53 are withdrawn until the leading edge of the strip in the flat position enters the space between the guide fingers. (Fig. 5a).

The guide finger is then moved into the operating position (FIG. 5b), so that the strip is twisted into the on-edge position and remains in this position during further operation of the installation.

Each group of guide fingers 52,53 is attached to a carrier (not shown) operated by suitable power means, such as a compressed air cylinder.

The mechanism shown in Figures 5a and 5b produces strips that are twisted from side to side alternately.

This action has a useful effect when the strip 51 is obtained by dividing a single sheet or wide strip of material, as described with respect to Figures 1 to 4b.

The splitting action releases internal stresses in the material that tend to bend the strip into its own plane.

The resulting bending moment varies depending on the location of the strip within the original sheet or wide strip, but generally has the same direction with respect to adjacent strips.

The above-described mechanism therefore at least partially cancels out the bending moments for each pair of adjacent strips at a location on the edge, so that deflection of the grid from the desired surface shape is minimized.

The guide device shown in Figures 6 to 8 operates on the principles described in connection with Figures 5a and 5b.

Individual guide members 57. 58 is pressure cylinder 59.6
The upper guide rod 55 and the lower guide rod 56 are structurally combined to be moved toward and away from each other with the aid of zero.

The strip 61 is pushed forward towards the pair of guide rods 55, 56 through a guide tube 62 of square cross section.

A ramp 63 provided between the guide tube 62 and the guide rods 55, 56 serves to raise the portion of the strip intersecting the area between the rods 55, 56 to a suitable level in the center of the guide tube 62. .

The ridges 64,65 serve to guide the strip laterally during its forward movement along the ramp 63.

The guide rod is shown in an extended or inactive position, and the front end of the strip can be retracted while remaining in a flat position.

When the guide rods 55-56 are moved to the operating position, the strips move into the guide member 5.
7.58 into a position on the edge defined by the vertical groove between the sides.

[Brief explanation of the drawing]

1a and 1b are end views and top views of the welded lattice, FIG. 2 is a schematic side view of a floor lattice manufacturing installation according to the invention, FIG. 3 is a plan view of the installation of FIG. Figures 4a and 4b are side views (including a partial cross section) of certain parts of the equipment in Figures 1 and 2 and their corresponding plan views; Figures 53 and 5b are
Figure 6 is a front view of a particular type of strip guide in two different positions, with the strip shown in section; Figure 6 is a front view of another type of strip guide, with the strip shown in section; Figure 7
The figure is a cross-sectional view along the line ■-■ in Figure 6, and Figure 8 is a cross-sectional view on the line ■ in Figure 6.
It is a sectional view on line -■. DESCRIPTION OF SYMBOLS 1...Support rod, 2...Cross rod, 3...Strip material supply station, 5...Dividing mechanism, 10...Welding station,
11... Cutting station, 16, 17... Coil.

Claims (1)

[Scope of Claims] 1. In manufacturing a floor lattice consisting of longitudinal force-directing strips standing on the edges with respect to the plane of the lattice and cross bars welded to the strips, the cross bars are A method of producing a longitudinal strip by longitudinally advancing the strip through welding stations that weld progressively across the strip.
A sheet or strip of material having a width corresponding to the total width of all longitudinal strips of the lattice is progressively unwound from one or more coils and is advanced in parallel with a flat surface parallel to the plane of the mat. A method for manufacturing a floor grating, characterized in that a mat of continuous strips is formed, and each strip forming the mat is progressively twisted into a raised position with respect to the plane of the mat before entering a welding station. 2. characterized in that the material for all longitudinal strips is unwound from the coil as a single sheet or wide strip, and that the strips are progressively divided into the number of strips required for the grid during the forward movement. The method according to claim 1. 3. A welding station comprising means for successively advancing a group of parallel strips with flat faces facing each other and means for placing and welding a crossbar in succession on said group of parallel strips; and means for supplying said strips to a welding station, said means for supplying said strips to a welding station having a total diameter sufficient to simultaneously draw out material for all conditions of said group. a rotatably supported receptacle of coiled strips or sheets of material having a rotatably supported coiled strip or sheet material, and means for conveying the continuous length of material from said receptacle to a welding station, and further comprising: Claim 1, characterized in that it comprises means for shaping the mat into a mat of parallel strips with a flat surface parallel to , and guide means for twisting each strip of the mat into a raised position. Apparatus for carrying out the described method. 4. The container shall consist of a single coiled sheet or wide strip, and shall have shearing means for dividing the sheet or wide strip unwound from the coil into a plurality of strips of the required width. 4. The device of claim 3, characterized in that: