JP2008272798A - Apparatus for manufacturing independent-type truss - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing an independent-type truss which can automatically correspond to the change of the pitch of a lattice streak and/or the whole length of a truss. <P>SOLUTION: This manufacturing apparatus includes; a bending device 2 for being changeable to the lattice streak 91 pitch; a first movable clamp 32 and a second movable clamp 33 for being movable in the transport direction and for fixing a lower side bending part 95 of the bent lattice streak 91; a first welding mechanism 41, being shiftable in the carrying direction, linked with the two movable clamps 32, 33 and disposed at almost center between two movable clamps 32, 33 and for welding the upper side bent part 92 of the lattice streak 91 with an upper string streak 93; a second welding mechanism 5 being shiftable in the carrying direction and forming the truss 9 by welding the lower part of the lattice streak 91 welding the upper side bent part 92 with the upper string streak 93 with a lower string streak 94; and a controlling instrument having memory stored while shifting the positioned data of the lower side bent part 95 of the bent lattice streak 91 as the basis at the position of the static clamp 31 and for controlling the first movable clamp 32, the second movable clamp 33 and the welding mechanisms 41, 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for manufacturing a self-supporting truss used for a structural material including a steel plate on which grooves are used for construction of a concrete slab and a self-supporting truss.

  In the construction of a conventional concrete floor slab, as shown in the perspective view of FIG. 7, a wire rod is bent into a wave shape at a constant pitch (for example, 200 mm) to form a lattice stripe 91, and the upper side of these two lattice stripes 91. A self-supporting truss 9 is formed by welding the bent portion 92 so as to sandwich one upper chord muscle 93 and welding the lower chord muscle 94 to the lower part of each of the two lattice muscles 91.

  The self-supporting truss 9 is cut to a certain length, and then placed on the iron plate 8 formed with parallel grooves such as a deck plate, a keystone plate, a rib plate, and the lower bent portion 95 of the lattice muscle 91. A construction method has been conventionally practiced in which a steel sheet 9 is welded to make a structural material, the structural material is bridged between receiving beams, and concrete is cast using the steel plate 8 as a discarded formwork.

  7, when the lower bent portion 95 of the lattice bar 91 is welded to the iron plate 9, the L-shaped channel 97 is used to weld the horizontal surface of the L-shaped channel 97 to the iron plate 9. 1 is welded to the side surface of the lower bent portion 95 of the lattice bar 91. However, the lower bent portion 95 of the lattice bar 91 may be directly welded to the iron plate 9.

  According to this construction method, the temporary load of the concrete placed by the self-supporting truss 9 can be supported, so that a support member for supporting the formwork from the lower side is unnecessary, and therefore, after the concrete is placed. No need to dismantle the formwork. Further, after the concrete is hardened, the self-supporting truss 9 serves as the main reinforcing bar of the reinforced concrete.

  In a conventional truss manufacturing apparatus that manufactures a self-supporting truss, one upper chord 93 and two lower chords 94 are supplied and arranged in a triangular shape while the wire is bent into a wave at a constant pitch. The self-supporting truss 9 is manufactured by welding the upper bent portion 92 of the bent lattice muscle 91 to the upper chord muscle 93 and welding the lower portion of the lattice muscle 91 to the lower chord muscle 94.

When the manufactured self-supporting truss 9 is cut, if the portion to be cut does not cut at the lower bent portion 95 of the lattice muscle 91, the allowable load is reduced, so the pitch of the lattice muscle 91 to be manufactured is reduced. Patent Document 1 below proposes a lattice bending apparatus that is configured to change an integer multiple of the pitch of the lattice stripe 91 to match a desired dimension.
Japanese Patent No. 3801492

  Multi-story buildings have a variety of room layouts and corridor shapes, so when constructing a concrete floor slab using steel plates and self-supporting trusses, the length will match the span of the receiving beam. Different types of structural materials must be prepared.

  According to such a conventional lattice bending device, it is possible to bend the lattice with a pitch that matches the span of the receiving beam, but when the lattice pitch and the total length of the truss are switched, the wire is fed out. 1 tact feed length setting, changing the position of the clamp that holds the lower bent part of the bent wire, changing the position of the welding device that welds the lattice to the upper and lower chords 93, 94, and the position of the cutting device Changes must be made.

  This switching operation is a task that requires skill and labor, and a useless truss that does not become a useable item is generated when the operation after switching is resumed.

  Therefore, the self-supporting truss manufacturing apparatus of the present invention was conceived to solve the problems of such a conventional apparatus, automatically changing the pitch of the lattice and the total length of the truss, and The configuration is such that a useless truss is not generated.

  The self-supporting truss manufacturing apparatus according to the present invention includes a step conveyor for feeding the wire material of the upper chord, the lower chord and the lattice, a moving clamp and a stationary clamp for holding the wire of the lattice at an interval, It moves in the same direction at half speed, and has a bending head that forms the upper bending part by pushing the wire rod in the crossing direction at almost the center of the stationary clamp and can change the length of one pitch of the lattice muscle Movable bending device, a first movable clamp and a second movable clamp that are movable in the conveyance direction and fix the lower bent portion of the bent lattice muscle, and move in the conveyance direction in conjunction with the two movable clamps. A first welding mechanism that is arranged at approximately the center of the two movable clamps and welds the upper bent portion of the lattice muscle to the upper chord, and is movable in the conveying direction, The second welding mechanism that forms the truss by welding the lower part of the lattice to the lower chord to weld the part to the upper chord, the cutting mechanism that can move in the transport direction and cut the truss, and the position of the stationary clamp as a reference And a control device having a memory for storing the position data of the lower bent portion of the latticed muscle bent while shifting it every tact.

  The control device has a memory for storing the position data of the lower bent portion of the bent lattice muscle while shifting it by one tact with reference to the position of the stationary clamp. The first movable clamp, the second movable clamp, the first welding mechanism, the second welding mechanism, and the change of the intervals of the cutting mechanism with respect to the stationary clamp and the operation thereof are controlled.

  According to the self-supporting truss manufacturing apparatus of the present invention, it has a memory for storing the position data of the lower bent portion of the bent lattice muscle while shifting it every tact with respect to the position of the stationary clamp. Based on this position data, the control device can automatically change the intervals of the first movable clamp, the second movable clamp, the first welding mechanism, the second welding mechanism, and the cutting mechanism with respect to the stationary clamp, The operations of the first welding mechanism, the second welding mechanism, and the cutting mechanism can also be controlled.

  According to the self-supporting truss manufacturing apparatus of the present invention, even if the length of one pitch of the lattice muscle is changed during manufacturing by changing the length of the truss, the first movable clamp, 2 The movable clamp, the first welding mechanism, the second welding mechanism, and the control for changing the position of the cutting mechanism are performed, so that a truss having a different pitch and / or a different full length can be continued without any waste. Can be manufactured.

  According to the self-supporting truss manufacturing apparatus of the present invention, it is also possible to manufacture a truss in which straight wires that are not bent at any length are projected at both ends of the truss.

(First embodiment)
As shown in the side view of FIG. 1 and the principle diagram of FIG. 2, the self-supporting truss manufacturing apparatus of the present invention includes a moving clamp 11 that intermittently feeds a wire rod at a constant length in the conveying direction. The conveyor 1, the bending mechanism 2 for bending the wire 90 into the lattice line 91, the first welding mechanism 41 for forming the truss 9 by welding the bent lattice line 91 to the upper chord line 93 and the lower chord line 94, and the second welding machine 42 and a cutting mechanism 5 for cutting the formed truss 9 to a predetermined length.

  The step conveyor 1 includes a hydraulic motor 12 and a moving clamp 11 that is driven by the hydraulic motor 12 to grip the wire 90 and move in the conveying direction along the base A. The step conveyor 1 includes a conveyor for feeding the upper chords 93 and the lower chords 94 in addition to the conveyor for feeding the wire 90 of the lattice 91, but in order to make the drawing easier to see, the wire 90 of the lattice 91 is used. Only the conveyor provided with the moving clamp 11 is shown.

  As shown in the side view of FIG. 1 and the principle diagram of FIG. 2, the bending apparatus 2 includes a step conveyor 1 that moves along a rail 16 on the base A, a screw conveyor 13a and a screw 13b. 1, a hydraulic motor 12 that drives 1, a moving clamp 11 that is provided on the step conveyor 1 and is driven by a hydraulic device and a rod 15, and a base A that holds and holds the lower bent portion 95 of the bent wire 90. It moves in the same direction at half the speed of the moving clamp 11 in conjunction with the moving clamp 11 and always forms the upper bent portion 92 located almost in the center of the moving clamp 11 and the stationary clamp 31. And the bending head 21 to be configured.

  The moving clamp 11 moves forward by grabbing the wire 90 when the step conveyor 1 moves forward and releases the wire 90 when the step conveyor 1 moves backward. In order to detect the moving distance of the moving clamp 11, an encoder 14 is provided on the step conveyor 1.

  The bending device 2 includes a rod 23 that moves up and down in the vertical direction, a bending head 21 that is mounted so as to protrude from the rod 23 in the horizontal direction and pushes up the central portion of the wire 90 to form an upper bent portion 92; The servo motor 24 drives the rod 23 in the vertical direction.

  As shown in FIG. 2, the base A is provided with a first movable clamp 32 and a second movable clamp 33 behind the stationary clamp 31 (on the right side in the drawing). A first welding mechanism 41 that is always located in the center is provided. The two movable clamps 32 and 33 are separately movable in the front-rear direction in accordance with the pitch of the bent lattice muscle 91, fix the position of the lower bent portion 95 of the lattice muscle 91, and The positioning operation in the welding operation of the welding mechanism 41 is performed.

  The first movable clamp 32, the second movable clamp 33, and the first welding mechanism 41 are each provided with a drive mechanism (not shown) for moving in the front-rear direction (left-right direction in the figure), and further an encoder (not shown). Are provided so as to detect a distance based on the position of the stationary clamp 31.

  The first welding mechanism 41 welds the upper chords 93 from both sides at the upper bent portion 92 of the two lattices 91 to fix the two lattices 91 to the one upper chord 93.

  Behind the two movable clamps 32 and 33, a second welding mechanism 42 for welding the two lower chords 94 to the lower part of the two lattices 91 to form the self-supporting truss 9 is provided. The second welding mechanism 42 also includes a drive mechanism (not shown) that moves to a position that hits the lower bent portion 95 of the lattice muscle 91 and an encoder (not shown) that detects a distance based on the position of the stationary clamp 31. ) Is provided.

  Behind the second welding mechanism 41, there is provided a cutting device 5 for cutting the formed self-supporting truss 9 to a desired length at the lower bent portion 95 of the lattice muscle 91. The cutting device 5 also has a drive mechanism (not shown) that moves to a position that hits the lower bent portion 95 of the lattice muscle 91 and an encoder (not shown) that detects a distance based on the position of the stationary clamp 31. Is provided.

  Next, a process of manufacturing a self-supporting truss by the self-supporting truss manufacturing apparatus configured as described above will be described with reference to FIG.

  When a truss having a length L is manufactured using a lattice muscle having a standard pitch p (for example, 200 mm), the length L to be manufactured is divided by the standard pitch p to obtain an integer n and a positive / negative fraction h, and a negative fraction h Is smaller than half of the standard pitch p (100 mm) (the positive fraction is larger than half of the standard pitch p), the fraction h is divided by an integer n and added to the standard pitch of 200 mm, respectively. = P + h / n.

  Similarly, the length L to be manufactured is divided by the standard pitch p to obtain an integer n and a positive / negative fraction h, and the positive fraction h is smaller than half (100 mm) of the standard pitch p (the negative fraction is the standard pitch p). In the case of greater than half), the fraction h is divided by the integer n and subtracted to the standard pitch of 200 mm to make one pitch P = p−h / n.

  Processing conditions such as the material of the wire 90, the wire diameter, the finished pitch P of the lattice stripe 91, the finished height of the lattice stripe 91, and the curvature of the bent portion are input to the computer of the control device. This processing condition is set so as to correct the amount of spring back that is restored by elastic deformation when the constraint during bending is released.

  The controller sets the distance between the stationary clamp 31 and the first movable clamp 32 and the distance between the first movable clamp 32 and the second movable clamp 33 to one pitch (P = p ± h / n). At this time, the first welding mechanism 41 is also moved to the center of the first movable clamp 32 and the second movable clamp 33 in conjunction with each other. At the same time, the second welding mechanism 42 and the cutting mechanism 5 are moved from the stationary clamp 31 to a position that is an integral multiple of 1 pitch P.

  As shown in (1) of FIG. 2, after the wire rod 90 is inserted into the released first moving clamp 11 and the distal end portion of the wire rod 90 is pressed and fixed by the stationary clamp 31, the moving clamp 11 is released. Then, the step conveyor 1 is moved, stopped at a position away from the stationary clamp 31 by a distance T, and the wire 90 is gripped by the moving clamp 11. This distance T is the length T of the wire 90 corresponding to one pitch of the finished dimension obtained by bending the wire 90.

  As shown in FIG. 2 (2), the rod 23 is driven in the vertical direction by the servo motor 24, the center portion of the wire 90 is pushed up to the set height by the bending head 21, and provided on the step conveyor 1 by the hydraulic motor 12. The moved moving clamp 11 is advanced from the stationary clamp 31 to the position of the distance P.

  At this time, since the bending head 21 also moves forward at half the speed of the moving clamp 11, the portion of the wire rod 90 pushed up by the bending head 21 always hits substantially the center of the moving clamp 11 and the stationary clamp 31.

  As shown in (3) of FIG. 2, the bending head 21 is lowered while the lower bending portion 95 already bent by the stationary clamp 31 is pressed and fixed, and the moving clamp 11 is released. The first moving clamp 11 is retracted together with the conveyor 1, and the stationary clamp is made so that the finished dimension is the sum of the length T of the wire 90 corresponding to one pitch and the length P of one pitch (T + P). Stop at a position away from 31 by a distance (T + P). At this time, the bending head 21 also moves backward at half speed in conjunction with it.

  At the stop position of the stationary clamp 31, the wire 90 is gripped by the moving clamp 11, and the stationary clamp 31 is released. Then, as shown in (4) of FIG. 2, the step conveyor 1 is advanced by a distance corresponding to one pitch P. At this time, the wire material of the upper chord line 93 and the lower chord line 94 is also sent out by the length corresponding to one pitch P at the same time. When the advance for one pitch P is completed, the stationary clamp 31 is operated to fix the already bent lower bent portion 95.

  Then, a series of operations shown in (1) to (3) of FIG. 2 are repeatedly performed to bend the wire 90 into a latticed line 91 having a desired pitch and a desired height.

  Each time the bent lattice 91 is advanced by one pitch P, the lower bent portion 95 that is bent by the stationary clamp 31, the first movable clamp 32, and the second movable clamp 33 is fixed. During the fixing, the first welding mechanism 41 is operated to weld the upper chord 93 with the upper bent portions 92 of the two lattices 91 from both sides.

  In this way, the two lattice muscles 91 fixed to the one upper chord muscle 93 are then welded to the lower part of each lattice muscle 91 by the second welding mechanism 42, and the two lower chord muscles 94 are respectively welded. 9 is formed.

  Since the formed self-supporting truss 9 passes through the cutting mechanism 5 by one pitch every tact, the cutting mechanism 5 is operated when the passed length reaches a predetermined length L (predetermined number of pitches). Then, the self-supporting truss 9 is cut to a predetermined length L at the lower bent portion 95 of the lattice muscle 91.

(Second Embodiment)
Next, after producing a self-supporting truss length L ₁ at a pitch P ₁ by a predetermined number, a description will be given of a step of changing the production of self-supporting truss length L ₂ at a pitch P ₂ in FIG.

  During the manufacture of the self-supporting truss, the control device stores the arrangement state of the lower bent portion 95 of the lattice muscle 91 with the stationary clamp 31 as a reference in the memory of the computer while shifting it every tact.

When the lower bent portion 95 at the end of the last lattice 91 of the self-supporting truss with the pitch P ₁ and the length L ₁ reaches the stationary clamp 31, the controller makes a long operation with the pitch P ₂ to be manufactured next. Corresponding to the self-supporting truss having the length L ₂ , the moving clamp 11 is stopped at a position separated from the stationary clamp 31 by a distance T ₂ as shown in FIG. This distance T ₂ is the length of the wire 90 in which the finished dimension obtained by bending the wire 90 corresponds to the pitch P ₂ .

As shown in (2) of FIG. 3, when the bending of the first tact is finished at the pitch P ₂ , the first movable clamp 32 and the second movable clamp as shown in (3) of FIG. 33, the first welding mechanism 41, the second welding mechanism 42 and the cutting mechanism 5 are simultaneously translated by the difference between the pitch P ₁ and the pitch P ₂ (P ₁ -P ₂ ), and the pitch P ₁ to the pitch P ₂ The lower bent portion 951 of the boundary changed to is fixed by the first movable clamp 32.

When the second tact bending process is completed at the pitch P ₂ , as shown in FIG. 3 (4), the control unit removes the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, and The second welding mechanism 42 is simultaneously translated by the difference (P ₁ −P ₂ ) between the pitch P ₁ and the pitch P _2, and the lower bent portion 951 at the boundary changed from the pitch P ₁ to the pitch P ₂ is formed. 2 Fix with movable clamp 33. At this time, the distance between the stationary clamp 31 and the spacing and the first movable clamp 32 of the first movable clamp 32 and the second movable clamp 33 is respectively changed to the pitch P _2.

By repeating a series of operations at a pitch P _2, as shown in (5) in FIG. 3, the boundary of the lower bent portion 951 has been changed from the pitch P ₁ to the pitch P ₂ reaches the second welding mechanism 42, The second welding mechanism 42 is moved from the stationary clamp 31 to a position that is an integral multiple (nP ₂ ) of the pitch P ₂ , and a welding operation is performed on the two lower chords 94.

As shown in FIG. 3 (6), before the lower bent portion 951 of the boundary changed from the pitch P ₁ to the pitch P ₂ reaches the cutting mechanism 5, the cutting mechanism 5 is moved from the stationary clamp 31 to the pitch P ₂ . It moved to the position of an integral multiple (nP ₂ ) and waited, and as shown in (7) of FIG. 3, the lower bent portion 951 at the boundary changed from pitch P ₁ to pitch P ₂ reached the cutting mechanism 5. when, cutting the final book end freestanding truss length L ₁ at a pitch P ₁ by operating the cutting mechanism 5 (the first tip of the free-standing truss pitch P ₂ in the length L _2).

  During the manufacture of the self-supporting truss 9, the control device shifts the arrangement state of the lower bending portion 951 corresponding to the boundary where the pitch of the lower bending portion 95 and the pitch of the lattice muscle 91 with respect to the stationary clamp 31 is changed every tact Stored in memory.

  Accordingly, the pitch and length of the self-supporting truss 9 to be manufactured are changed based on the stored data based on the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, the second welding mechanism 42, and the cutting. Since the operation time of each device of the mechanism 5 can be recognized in advance by the control device, each device can be arranged at a predetermined position in accordance with the passage time of the lower bent portion 951 of the boundary.

Thereafter, the self-supporting type having the length L ₂ in the production mode of the pitch P ₂ without changing the positions of the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, the second welding mechanism 42, and the cutting mechanism 5. The truss 9 is manufactured. Thus, even if the pitch and length of the self-supporting truss 9 to be manufactured are changed, it can be continuously manufactured without any waste.

(Third embodiment)
Next, in order to make it easier to connect the rebar assembly of the cross beam and the self-supporting truss, a straight portion that does not bend the lattice wire of the lattice bars protrudes by one pitch at both ends of the self-supporting truss of a certain length. The process of manufacturing the self-supporting truss made will be described with reference to FIG.

  In order to project the linear part by one pitch at both ends of the self-supporting truss, a straight part of two pitches must be formed in advance between two self-supporting trusses, and the center must be cut. I must.

  As shown in (1) of FIG. 4, the first implementation is performed without changing the positions of the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, the second welding mechanism 42, and the cutting mechanism 5. A truss having a length L is manufactured at a pitch P through the same steps as described in the embodiment.

  As shown in (2) of FIG. 4, when the lower bent portion 95 at the end of the first truss 91 reaches the stationary clamp 31 and is fixed, the moving clamp 11 is released and the step conveyor 1 is moved. Thus, the wire 90 is stopped from the stationary clamp 31 by a distance corresponding to two pitches, and the wire 90 is gripped by the moving clamp 11.

  As shown in FIG. 4 (2), the first movable clamp 32 and the second movable clamp 33 are opened, and the movable clamp 11 is advanced by one pitch, so that the wire 90 of the lattice muscle not to be bent is equivalent to one pitch. While moving forward, the upper and lower chords 93 and 94 are also advanced by one pitch.

  Then, as shown in (3) of FIG. 4, after fixing the lattice rod 96 of the lattice muscle which is not bent by the first movable clamp 32 and fixing the lower bent portion 95 of the lattice muscle by the second movable clamp 33, The upper bent portion 95 of the lattice muscle 91 is welded to the upper chord muscle 93 by the first welding mechanism 41, and the lower portion of the lattice muscle is welded to the lower chord muscle 94 by the second welding mechanism 42.

  The moving clamp 11 is released again, the step conveyor 1 is moved, stopped at a position separated from the stationary clamp 31 by a distance of one pitch, and the wire 90 is held by the moving clamp 11 and waited.

  As shown in (3) of FIG. 4, the wire rod 90 of the lattice muscle 91 is bent by opening the first movable clamp 32 and the second movable clamp 33 again and moving the moving clamp 11 forward by one pitch. The first chord line 93 and the lower chord line 94 are also moved forward by one pitch. By this operation, lattice pitch wire 96 that is not bent between adjacent trusses 9 can be present for two pitches.

  Then, after fixing two pitches of the lattice wire 96 which is not bent by the stationary clamp 31, the first movable clamp 32 and the second movable clamp 33, the second welding mechanism 42 welds the lower part of the lattice 91 to the lower chord 94. To do.

  As shown in (3) of FIG. 4, the moving clamp 11 is released and the step conveyor 1 is moved, and the bent dimension is the length T of the wire 90 corresponding to one pitch. The wire 90 is stopped at a distant position, and the wire 90 is gripped by the moving clamp 11, and the production of the next truss 9 is started.

  As shown in (5) to (8) of FIG. 4, during the manufacture of the next truss 9, when the lattice rod wire 96 that is not bent passes through the first welding mechanism 41 and the second welding mechanism 42. , Stop the welding operation.

  As shown in FIG. 4 (9), the center of the wire 96 for two pitches of the unlatched lattice muscle (one pitch from the end of the previous lattice and one pitch from the tip of the subsequent lattice) is cut. When the mechanism 5 is reached, the cutting mechanism 5 is operated to cut the lattice.

  In this way, it is possible to manufacture a self-supporting truss in which straight portions 96 that do not bend the lattice material of the lattice are protruded by one pitch at both ends of the self-supporting truss 9 having a predetermined length.

(Fourth embodiment)
In the self-supporting truss manufacturing apparatus of the present invention, the positions of the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, the second welding mechanism 42, and the cutting mechanism 5 are controlled with respect to the stationary clamp 31. Each of the devices can be changed separately, and during the manufacture of the truss, the arrangement state of the lower bending portion 95 of the lattice muscle 91 with respect to the stationary clamp 31 is determined in the control device. Since the data is stored in the memory while being shifted every tact, the wire rod 96 of the lattice stripe 91 having an arbitrary length N which is not an integral multiple of one pitch is formed in a straight line at both ends of the self-supporting truss having a predetermined length. be able to.

  A fourth embodiment of the present invention will be described with reference to FIGS. 5 shows the first half steps (1 to 8) of all steps, FIG. 6 shows the second half steps (8 to 14) of all steps, and step (8) is shown in both figures. It is shown redundantly.

  The length N of the linear wire 96 protruding from both ends of the self-supporting truss is compared with an integer multiple nP of 1 pitch P to determine the fraction s. Hereinafter, a case where n = 1, that is, a case where N = P + s will be described as an example.

  As shown in (1) of FIG. 5, the first implementation is performed without changing the positions of the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, the second welding mechanism 42, and the cutting mechanism 5. A truss having a length L is manufactured at a pitch P through the same steps as described in the embodiment.

  As shown in FIG. 5 (2), when a truss having a length L is manufactured at a pitch P and the lower bent portion 95 at the end of one truss reaches the stationary clamp 31 and is fixed, it moves. The clamp 11 is released and the step conveyor 1 is moved to stop the clamp 11 at a position 2 pitch P away from the stationary clamp 31 and the wire clamp 90 is gripped by the moving clamp 11.

  As shown in (3) of FIG. 5, the first movable clamp 32 and the second movable clamp 33 are opened, and the movable clamp 11 is advanced by one pitch, so that the wire 90 of the lattice muscle 1 is not bent. While moving forward by the pitch, the upper and lower chords 93 and 94 are also moved forward by one pitch.

  Then, the lattice rod wire 96 which is not bent by the first movable clamp 32 is fixed, the lower bending portion 95 of the lattice muscle is fixed by the second movable clamp 33, and then the upper bending portion of the lattice muscle 91 is bent by the first welding mechanism 41. The portion 92 is welded to the upper chord 93 and the lower portion of the lattice 91 is welded to the lower chord 94 by the second welding mechanism 42.

  As shown in (4) of FIG. 5, the first movable clamp 32 and the second movable clamp 33 are opened, and the movable clamp 11 is advanced by one pitch, so that the wire 90 of the lattice muscle is not bent. While moving forward by the pitch, the upper and lower chords 93 and 94 are also moved forward by one pitch.

  Then, the lattice rod 96 that is not bent by the first movable clamp 32 is fixed, the lower bent portion 95 of the lattice muscle is fixed by the second movable clamp 33, and the lower portion of the lattice 91 is lowered by the second welding mechanism 42. Weld to the lower chord 94.

  When the length N of the linear wire 96 projecting from both ends of the self-supporting truss is equal to or more than one pitch, the moving clamp 11 is released multiple times and the step conveyor 1 is moved to start from the stationary clamp 31. Stop the wire 90 by a distance of one pitch distance, grab the wire 90 with the moving clamp 11, open the first movable clamp 32 and the second movable clamp 33, and advance the moving clamp 11 by one pitch. As a result, the lattice wire 90 is advanced by one pitch without bending, and the upper and lower chords 93 and 94 are also advanced by one pitch. Then, the upper bent portion 95 of the lattice bar 91 is welded to the upper chord line 93 by the first welding mechanism 41, and the lower part of the lattice bar 91 is welded to the lower chord line 94 by the second welding mechanism 42.

  Since the fraction s of the linear wire 96 length N to be projected and the integer multiple nP of 1 pitch P is calculated first, the moving clamp 11 is released as shown in (5) of FIG. The step conveyor 1 is moved and stopped at a position separated from the stationary clamp 31 by a distance (P + 2s) that is 2 s times the fraction s and 1 pitch, and the wire rod 90 is gripped by the moving clamp 11.

  As shown in FIG. 5 (6), the first movable clamp 32 and the second movable clamp 33 are opened, and the moving clamp 11 is advanced by the fraction s, so that the fraction 90 is not bent. While moving forward by s, the upper and lower chords 93 and 94 are also advanced by the fraction s. By this operation, it is possible to make the lattice rod 96 that is not bent between the adjacent trusses 9 twice as long as the length N (nP + s) (see (14) in FIG. 6).

  At this time, as shown in FIG. 5 (6), the first movable clamp 32, the second movable clamp 33, the first welding mechanism 41, and the second welding mechanism 42 are simultaneously paralleled by the distance of the fraction s by the control device. Move.

  As shown in (7) of FIG. 5, the moving clamp 11 is released and the step conveyor 1 is moved, and the folded dimension is separated from the stationary clamp 31 by the length T of the wire 90 corresponding to one pitch. The wire rod 90 is stopped at the position, and the wire 90 is gripped by the moving clamp 11, and the production of the next truss 9 is started as shown in (8) of FIG.

  Before the first lower bent portion 95 of the next lattice muscle 91 is fixed by the stationary clamp 31, the position of the first movable clamp 32 is one pitch from the stationary clamp 31 as shown in FIG. The first lower bent portion 95 is fixed by the stationary clamp 31, the first movable clamp 32, and the second movable clamp 33, and the lower portion of the lattice muscle 91 is lowered by the second welding mechanism 42 to the lower chord muscle. Weld to 94.

  As shown in FIG. 6 (10), before the second lower bent portion 95 of the lattice muscle 91 formed in the next tact is fixed by the stationary clamp 31, the position of the second movable clamp 32 is set to the stationary clamp 31. The first and second lower bent portions 95 are fixed by the stationary clamp 31, the first movable clamp 32, and the second movable clamp 33, and the first welding mechanism 41 is used to return the upper chord line. The upper bent portion 92 of the lattice muscle 91 is welded to 93, and the lower portion of the lattice muscle 91 is welded to the lower chord muscle 94 by the second welding mechanism 42.

  After the steps (10) and (11) in FIG. 6, the process proceeds to the step (12) in FIG. 6, and the first lower bent portion 95 of the lattice muscle 91 reaches the second welding mechanism 42. At this time, the position of the second welding mechanism 42 is returned to the integral multiple of one pitch from the stationary clamp 31, and the lower part of the lattice 91 is welded to the lower chord 94.

  As shown in (8) to (12) of FIG. 6, during the manufacture of the next truss 9, when the lattice material wire 96 which is not bent passes through the first welding mechanism 41 and the second welding mechanism 42. , Stop the welding operation.

  After the step (13) in FIG. 6, as shown in (14) in FIG. 6, when the lattice wire 96 that is not bent reaches the cutting mechanism 5, the lattice 96 is in a position that hits the center of the lattice wire 96. A cutting operation is performed by moving the cutting mechanism 5 by a distance s.

  The position of the cutting mechanism 5 shown in (14) of FIG. 6 does not need to be changed unless the specifications of the self-supporting truss to be manufactured are changed.

  In this way, it is possible to manufacture a self-supporting truss in which a straight portion 96 that does not bend the lattice material of the lattice is protruded by an arbitrary length N (nP + s) at both ends of the self-supporting truss 9 having a predetermined length. .

The side view which shows the lattice muscle bending process part in the manufacturing apparatus of the self-supporting truss of this invention, Process drawing explaining operation | movement of 1st Embodiment of the manufacturing apparatus of the self-supporting truss of this invention, Process drawing explaining operation | movement of 2nd Embodiment of the manufacturing apparatus of the self-supporting truss of this invention, Process drawing explaining operation | movement of 3rd Embodiment of the manufacturing apparatus of the self-supporting truss of this invention, The process drawing of the first half explaining operation | movement of 4th Embodiment of the manufacturing apparatus of the self-supporting truss of this invention, Process drawing of the latter half explaining operation | movement of 4th Embodiment of the manufacturing apparatus of the self-supporting truss of this invention, It is a perspective view which shows an example which welded the conventional self-supporting truss to the iron plate.

Explanation of symbols

A base 1 step conveyor
11 Moving clamp
12 Hydraulic motor
14 Encoder
15 Rod 2 bending device
21 Bending head
23 Rod
24 Servo motor
31 Static clamp
32, 33 Movable clamp 5 Cutting mechanism 9 Self-supporting truss
90 Lattice muscle wire
91 Lattice muscle
92 Upper bend
93 First String
94 Lower chord
95 Lower bend
96 Non-bending wire

Claims (4)

One upper chord and two lower chords are arranged in a triangular shape, the upper chord is welded to the upper bent portion of the latticed bend, and the lower chord is welded to the lower portion of the lattice. A self-supporting truss manufacturing apparatus that constitutes a self-supporting truss,
A step conveyor for feeding the wire of the upper chord, lower chord and lattice;
A moving clamp and a stationary clamp that hold the wire of the lattice muscle at an interval, and move in the same direction at almost half the speed of the moving clamp, and the wire in the crossing direction at the approximate center of the moving clamp and the stationary clamp. A bending device that includes a bending head that pushes to form an upper bent portion, and is capable of changing the length of one pitch of the lattice muscle;
A first movable clamp and a second movable clamp that are movable in the conveying direction and fix a lower bent portion of the bent lattice muscle;
A first welding mechanism that is movable in the conveying direction in conjunction with the two movable clamps and is arranged at substantially the center of the two movable clamps and welds the upper bent portion of the lattice muscle to the upper chord;
A second welding mechanism that is movable in the transport direction and welds the lower bent portion of the upper bent portion to the upper chord to weld the lower chord to the lower chord;
A cutting mechanism that is movable in the conveying direction and cuts the truss;
A control device having a memory for storing the position data of the lower bent portion of the bent lattice muscle while shifting it every tact with respect to the position of the stationary clamp;
An apparatus for producing a self-supporting truss, comprising: When the length of one pitch of the lattice muscle is changed in the bending device, the control device controls the first movable relative to the stationary clamp based on the position data of the lower bent portion stored in the memory while shifting every tact. The apparatus for producing a self-supporting truss according to claim 1, wherein intervals between the clamp, the second movable clamp, the first welding mechanism, the second welding mechanism, and the cutting mechanism are sequentially changed. Positions of the lower bent portion and the linear portion stored in the memory while being shifted every tact when a linear portion that does not bend the lattice in the bending apparatus is formed to have a length that is an integral multiple of one pitch. 2. The self-supporting truss manufacturing apparatus according to claim 1, wherein when the linear portion passes through the first welding mechanism and the second welding mechanism, the welding operation is stopped by the control device based on the data. In a bending apparatus, when a linear portion that does not bend the lattice is formed with an integral multiple of one pitch and a fraction length, the lower bent portion and the linear portion that are stored in the memory while being shifted every tact On the basis of the position data, the control device sequentially changes the intervals of the first movable clamp, the second movable clamp, the first welding mechanism, the second welding mechanism, and the cutting mechanism relative to the stationary clamp, and the linear portion is the first. The self-supporting truss manufacturing apparatus according to claim 1, wherein the welding operation is stopped when passing through the welding mechanism and the second welding mechanism.

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