JPH0685936B2 - Cross fin coil bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention forms an L-shape or a U-shape by bending one or two portions of a cubic cross fin coil as a primary product while sandwiching it from the front and rear. The present invention relates to a bending device for obtaining a finished cross fin coil.

(Prior Art) A plurality of heat transfer tubes are arranged in a multi-row, multi-row arrangement so as to cross a fin that is arranged in parallel at a narrow pitch of a predetermined dimension, and is penetrated, and a tube plate is provided near both ends of the heat transfer tube. And the heat transfer tubes adjacent to each other are connected by a U-shaped tube so that the cross fin coil is bent into an L-shape or a U-shape so that the air circulation surface becomes two or three surfaces. This is often used as the heat source side coil of the outdoor unit, but the conventional bending apparatus has a structure as shown in FIG. 7 and is as described below.

An inner radius bending die (1) having a curved surface and fixed so as not to move in the vertical direction (vertical direction in FIG. 7) and provided with the curved surface facing forward and outward, and this bending die (1 )
A pair of molds for bending with a flat plate-shaped outer radius bending plate (4) arranged in front of the bending mold (1) in parallel with a reference plane in contact with the inner end of the curved surface of The bending die (1) and the bending plate (4) are used as members and have an interval corresponding to the maximum fin depth dimension of the cross fin coil to be processed.
This bending plate (4) is held between the bending die (1) and
The diameter of the curved surface of the
The structure is such that it can be circumscribed by two virtual arcs, and a predetermined position of the cross fin coil (7) is sandwiched between the bending die (1) and the bending plate (4), and the fluid (oil ) While pressing the bending plate (4) with a pressure cylinder, rotate the bending plate (4) from the horizontal position shown in FIG. 7 to the vertical position to make the cross fin coil (7) L-shaped. It is bent into.

(Problems to be solved by the invention) The device shown in the drawing is a device for processing a U-shaped product, and has two pairs of left and right symmetrical die members. Has an integrated structure with a special jig (35) for connection.

In the conventional device described above, since the space between the bending die (1) and the bending plate (4) is constant, the number of rows of the heat transfer tubes is reduced, so that a cross fin coil having a small fin depth is bent. In this case, it is necessary to attach a spacer (36) having a thickness commensurate with the reduction in the depth dimension to the pressing surface side of the bending plate (4), and the worker must add a high weight each time the type of processed product changes. Since the spacer (36) must be replaced and set up, it is not only complicated but also there is a problem of reduced efficiency due to lost time.

Furthermore, when performing a right-angled bending, the cross fin coil (7) has elasticity in the restoring direction with respect to bending,
Since this elasticity varies depending on the number of rows of heat transfer tubes, the turning end point of the bending plate (4) needs to be changed depending on the depth dimension of the cross fin coil (7), and therefore the turning end point is defined. Another problem was that the stopper had to be adjusted each time.

Further, in the case of processing into a U-shape, when it is desired to change the finished width of the coil (distance between the outer surfaces of both rounded portions), it is necessary to replace the dedicated jig (35), and at the same time, the bending plate ( The rotation center of 4) had to be adjusted, which was also undesirable because it also caused complication.

In view of such an actual situation, the present invention has been devised in order to solve the conventional problems, in which the presser plate is pivotally supported on the support base for linear movement in a predetermined direction,
The holding plate itself is rotatably provided with one end thereof as a central axis so that a predetermined relationship is maintained between the linear movement amount of the support base and the turning angle of the holding plate. It is possible to easily perform various bending processes with different depth dimensions by omitting the spacers and eliminating the need for jig replacement, by simply controlling the operation. It is an object of the invention to realize improvement of processing efficiency by reducing loss time.

(Means for Solving the Problems) However, as is apparent from the drawings showing the embodiments of the present invention, the inner radius bending die (1) having a curved surface, and the curved surface of the bending die (1) A support base (2) provided in linear motion in a direction parallel to a reference plane in contact with one end, a drive device (3) for linearly driving the support base (2), and a flat plate-shaped one end thereof A bending plate (4) for outer radius, which is rotatably provided so as to face the curved surface of the bending die (1) by being pivotally supported by the support base (2) and can be brought into contact with and separated from the curved surface (4). 4) is attached to the support base (2) by being connected to it, and rotating means (5) for rotating the bending plate (4), and the drive device (3) according to the operation of the rotating means (5). The bending plate (4) is parallel to the reference plane. The bending die (1) and the bending plate (4) are composed of a control means (6) for linearly moving the support base (2) by a predetermined amount determined by a rotation angle (θ) when displaced with respect to a position. By sandwiching a predetermined part of the cross fin coil (7) by and the bending plate (4) is moved around the bending die (1), the cross section is L
The apparatus is configured to mold a cross fin coil (7) having a U shape or a U shape.

(Operation) The present invention provides an outer radius bending plate (hereinafter abbreviated as bending plate) (4), which has one end supported by a support base (2) and is rotatable in a direction perpendicular to a pressing plane. Support base (2)
After setting the cross fin coil along this bending plate (4) by setting it to the reference position where the pressing surface is parallel to the linear movement direction of, the inner radius bending die (hereinafter abbreviated as bending die)
(1) is moved closer to the bending plate (4) so that the bending die (1) and the bending plate (4) hold a predetermined portion of the cross fin coil (7).

The bending means is started by operating the control means (6) from this sandwiched state, and while gradually rotating the bending plate (4) by operating the rotating means (5), for example, the hydraulic cylinder (5). The rotation angle (θ) with respect to the reference position is detected moment by moment, and the support base (2) is driven by driving the servo motor as the drive device (3) by a predetermined amount determined from the relationship with the rotation angle (θ). ) Is moved linearly, the bending plate (4) is concentric with the curved surface of the bending die (1), and the depth dimension (fin width dimension) of the cross fin coil (7) is added to the radius of the curved surface. The bending plate (4) can be moved while always in contact with a cylindrical surface having a radius, and when the bending plate (4) is moved by a rotation angle in consideration of elasticity of the cross fin coil (7) in a restoring direction against bending. ) Is returned to the original state.

Thus, the bending of the cross fin coil (7) is completed,
Regardless of the size of the fin width, it is sandwiched between the bending die (1) and the bending plate (4), and the servo motor (3) can be operated by the hydraulic cylinder (5) by the control means (6). Bending can be easily performed by a simple operation of simply driving it.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

FIGS. 1 and 2 relate to an embodiment of the present invention. A U-shaped cross fin coil (7) in which the cross fin coil (7) is bent at two symmetrical points at the same time so that the air flows in three directions. However, the present invention may be an apparatus for forming an L-shaped device having a structure having only one side and air flowing in two directions at right angles.

In both figures, (8) is a base installed on the floor surface, which extends horizontally in the left-right direction (left-right direction in FIG. 1) and has a pair of screw rods (9) in a front-rear parallel arrangement, (9) is rotatably supported and connected to a slide motor (10) to reversibly rotate the screw rods (9), (9).

(11) is a slide base mounted on the base (8) in a symmetrical pair, and has two or four blocks on the lower surface, each of which has a threaded hole therethrough. , When the slide motor (10) is driven by screwing this block into the threaded rods (9), (9),
The pair of slide bases (11), (11) are linearly moved in the leftward or rightward direction synchronously, so that the pair of slide bases (1), (1) can be aligned with each other. No

To each slide base (11), a pair of straight rails (12), (12) extending left and right and arranged in parallel in the front and rear are fixed, and these straight rails (12), ( 12) A support base (2) is provided so as to extend over and slidably placed.

Each of the support bases (2) integrally has a block having a threaded hole, and a screw rod (13) screwed into the block is horizontally extended in the left-right direction so that one end of the drive device is driven. The axis of the servo motor as (3) is connected through a speed reducer, and the frame of the servo motor (3) is fixed to the support base (2). When the servo motor (3) is driven, each support base is fixed. (2) is moved horizontally in the horizontal direction.

A bending plate frame (14) and a cylinder frame (15) are erected as a pair in the front-rear direction on the upper surface of the support base, and the bending plate frame (14) is provided in the cylinder frame (15). ) Is provided near the center line of the entire bending apparatus.

The upper ends of the pair of bending plate frames (14) are bridged to rotatably support both sides of one end of the bending plate (4), while the pair of cylinder frames (15) are rotated. The main body of the hydraulic cylinder as the means (5) is rotatably supported in an upright plane in the left-right direction, and the rod of the hydraulic cylinder (5) is attached to the free side end of the bending plate (4). It is connected through a rotating joint.

With this structure, the bending plate (4) is rotated about the one end supported by the upper end of the bending plate frame (14) by the rod advancing and retracting of the hydraulic cylinder (5), and the bending plate (4) moves horizontally. The other end is pushed upward from the reference position, and is provided so as to be able to rotate about the horizontal axis in a rotation angle range in which it passes the upright from the horizontal and slightly tilts.

(16) is a suspension main body fixed to a pair of left and right bending plates (4), (4) above a central position which is a distribution center thereof, and is used for bending the cross fin coil (7). It has sufficient strength to withstand the pressure at the time and to support the bending die (1) described later so as not to move.

This suspension main body (16) has a large pressure receiving area and a high-capacity hydraulic cylinder (17) fixed downward, and a horizontal support frame (18) is horizontally attached to the lower end of the rod of the cylinder (17). It is held and connected so that it can move up and down.

The horizontal support frame (18) is fixed upright from the frame 2
The rods (19), (19) are fixed to the suspension main body (16), and the guides (20), having vertical through holes,
It is slidably fitted to the (20), can be moved up and down as described above, and is formed so as to maintain a horizontal state and withstand pressure.

The horizontal support frame (18) having the above structure is provided with a parallel motion mechanism and a pair of bending dies (1), (1) as shown in FIG. 3, and this structure will be described below. )
Is a screw shaft, and screws are engraved from the center part to the left and right with one pitch in the forward direction and the other in the opposite direction. Both ends are axially supported by the horizontal support frame (18) via bearings. The slide motor (22) is connected to the center through a speed reducer, for example.

(23) has a screw hole corresponding to the screw shaft (21) 2
Individual blocks, each of which is screwed into the screw shaft (21), cantilever the linear motion rail (24), and
It is supported so as to extend at a right angle to the screw shaft (21).

Reference numeral (25) is a parallel movement mechanism, and is a pair of levers (26), which are of equal length to each other and have a fulcrum for inserting a pin at a midpoint
(26) engages in a corner-to-corner relationship through the pin at the fulcrum, and linear motion bearing blocks (27) are fixed to both ends of the levers (26) and (26). ), (26) opposite linear motion bearing block (2
7), (27) as a set, each linear motion rail (24),
The structure is slidably fitted to (24).

When the slide motor (22) is rotationally driven, for example, in the clockwise direction, the parallel movement mechanism thus constructed is arranged so that both blocks (2
As a result of the movements of 3) and (23) moving away from each other at a constant speed, the linear motion rails (24) and (24) facing each other in parallel move away from each other while maintaining the changed state. .

On the other hand, when the slide motor (22) is rotationally driven in the counterclockwise direction, the rails (24) and (24) move in a direction in which they approach each other while keeping the parallel.

The bending die (1) is fixed so as to extend over the other end side of the linear motion rail (24) and the block (23). The bending die (1) and the rail (24) are to be processed. The bending die (1) is formed into a long solid body having a fan-shaped cross section having a curved surface of an arc of 1/4 of a circle by forming the bending die (1) sufficiently long compared to the length of the fins in the cross fin coil (7). (See FIG. 4).

The bending die (1) having the above-described shape is arranged so that one side of a plane orthogonal to each other extends horizontally and the other side extends vertically, and is in a state of being parallel to the linear motion rail (24),
Fix it as described above.

Thus, the curved surface of the bending die (1) and the flat surface of the bending plate (4) face each other vertically, and the bending plate (4) shown in FIG.
Has an arrangement configuration in which it is held parallel to an imaginary reference plane circumscribing one end of the curved surface of the bending die (1).

In FIG. 1, reference numeral (28) is a bending angle detecting encoder provided on a shaft portion supporting one end of the bending plate (4) at the upper end of the bending plate frame (14). ) Detects the rotation angle (θ) with respect to the horizontal reference position and issues an electric signal.

On the other hand, (29) is a bending plate displacement detection encoder connected to the screw rod (13), and detects the amount of linear movement of the bending plate (4) from the origin position immediately before moving for bending. It is designed to emit an electric signal.

In addition, the position of the cross fin coil (7) and the detector that detects the distance between the pair of bending molds (1) and (1), the detector that detects the level of both bending molds (1) and (1), Although a detector for detecting is provided, the description thereof is omitted.

In FIG. 1, (30) is a work pushing cylinder for pushing up the cross fin coil (7) and separating it from the bending plates (4), (4).

The bending device having the above-described structure is the control means (6).
Servo motor (3), hydraulic cylinders (5), control valves for hydraulic cylinders (17), slide motors (10), (22), work lifting cylinder (30)
The control valve, other related motors and actuators are electrically connected.

The control means (6) includes the encoders (28), (2
9), a control device (31) that receives an electric signal from each detector and issues a command based on the calculation and the calculation result, and the controllers (32), (3) of the motors (3), (10), (22).
3), (34) and control valve relays, etc.
This operation will be clarified by the following explanation of the bending operation.

A pair of bending plates (4), (4) in which a cubic cross fin coil (7), which is a temporary product, is set at a horizontal reference position and origin by a transfer device such as a conveyor and a lifter.
After being transported to a fixed position straddling the carriage, the control means (6) is operated to operate the hydraulic cylinder (17) and the slide motor (2
2) is driven and the pair of bending dies (1) and (1) are moved and stopped at a position where they are almost in contact with the cross fin coil (7).

After that, by driving a total of four hydraulic cylinders (5), (5), ... Composed of one set of hydraulic cylinders (5), (5) on both sides in synchronization, as shown in FIG. ,
The pair of bending plates (4) and (4) are rotated in the elevation direction about the fulcrum of the end.

The rotation angle (θ) at this time is detected by the encoder (28), and the horizontal length (L) of the bending plates (4) and (4) determined by the rotation angle (θ) is the above-mentioned. The calculation circuit in the control device (31) calculates each time it is detected, and the output corresponding to the calculated value is given to the servomotors (3) and (3). The bending plates (4), (4) are moved in a direction away from each other by a predetermined distance.

As a result, as shown in FIG. 5, the bending plate (4) is bent to the outside radius of the cross fin coil (7) to be bent, that is, to the radius of the curved surface of the bending die (1). The pressing surface of the bending plate (4) is always in contact with the set arc having a radius of a value obtained by adding the widths, and thus the bending plate (4) is rotated and horizontally moved in accordance with it. The closed loop is carried out sequentially according to commands from the control device (31), with a limit of a rotation angle slightly larger than 90 ° and a horizontal movement amount substantially corresponding to the radius of the set arc in consideration of the restoring elasticity. The U-shaped cross fin coil (7) having a required bending diameter is machined by automatically performing the control method.

The data to be written in the storage unit of the sequencer (31) is apparent with reference to FIG. 6, but the horizontal movement distance (L) with respect to the turning angle (θ) of the bending plate (4) is L = It becomes ▲ ▼-(▲ ▼ + ▲ ▼).

However, in FIG. 6, (P) and (P) 'are the rotation centers of the bending plate (4), and these rotation centers are supposed to move horizontally on the line AA.

Where ▲ ▼ = (r + w) sinθ ▲ ▼ = lsinθ Then, M = (r + w−1) + l cosθ− (r + w) cosθ = (r + w−1) (1-cosθ) Becomes

Therefore (L) is So, summarizing this, The relational expression of is established.

The fin width (w) of the cross fin coil (7) to be processed beforehand based on the above relational expression (a), and the bending die (1)
Since the curved surface radius (r) is known, the predetermined horizontal movement distance (L) with respect to the rotation angle (θ) can be easily obtained.

If the bending center of the bending die (1) is positioned on the center line of the cross direction of 45 ° with respect to the horizontal plane at the reference position of the bending plate (4) as shown in FIG. There is an advantage that the outer width dimension of (7) can be bent so that it can be kept constant regardless of the change in the fin width, that is, the difference in the number of rows of the heat transfer tubes.

(Effect of the invention) The present invention provides a bending plate (4) having a pressing flat surface for bending work,
While rotating from a reference position that is parallel to the reference plane,
By controlling the bending plate (4) to move forward in parallel with the reference plane by a preset movement amount according to the change of the rotation angle (θ), the cross fin coil (7) is irrespective of the difference in fin width. Since it can be pressed against the curved surface of the bending die (1) to perform bending, the setup can be simplified and the operation can be simplified compared to the conventional one that required a spacer having a different thickness each time the fin width was changed. It has the advantage of being easy and improves the processing efficiency.

In addition, according to the present invention, since the bending plate (4) is always in contact with the outer curved surface of the cross fin coil (7) to be bent, it is possible to obtain a bent portion having an accurate dimension without distortion. You can

[Brief description of drawings]

FIG. 1 is a front view of a bending apparatus according to an example of the present invention, FIG. 2 is a perspective view of an essential part in FIG. 1, and FIGS. 3 and 4 are plan views showing the same bending die support mechanism. Front view, No. 5
FIG. 6 and FIG. 6 are operation explanatory views of the bending plate in FIG. 1, and FIG. 7 is a schematic structural view of a conventional bending apparatus. (1) …… Bending die for inner radius, (2) …… Support base, (3) …… Drive device, (4) …… Bending plate for outer radius, (5) …… Rotating means, (6) ...... Control means (7) …… Cross fin coil.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 58-47318 (JP, U) Rikai 60-11117 (JP, U) Japanese Patent Sho 52-9551 (JP, B2)

Claims (1)

[Claims] 1. A bending die (1) for an inner radius having a curved surface (1)
A support base (2) provided for linear movement in a direction parallel to a reference plane in contact with one end of the curved surface of the bending die (1), and a drive device (3) for linearly driving the support base (2). ), And a rotatably provided outer radius which is formed in a flat plate shape, one end of which is pivotally supported by the support base (2) to face the curved surface of the bending die (1) and which can be brought into and out of contact with Bending plate (4), rotating means (5) for connecting the bending plate (4) to the supporting base (2) and rotating the bending plate (4), and the rotating means (5). ) By driving the drive device (3) to move the bending plate (4) with respect to a reference position parallel to the reference plane by a predetermined amount determined by a rotation angle (θ). The control means (6) for linearly moving the support base (2), A predetermined position of the cross fin coil (7) is sandwiched between the bending die (1) and the bending plate (4), and the bending plate (4) is moved around the bending die (1) to have an L-shaped cross section. Alternatively, a cross fin coil bending device characterized by molding a U-shaped cross fin coil (7).