KR20250001559A - stainless coil winding apparatus - Google Patents

Abstract

The present invention proposes a stainless steel double coil manufacturing device which uses a stainless steel pipe having high rigidity and elasticity to produce a double coil formed in two layers on the inner and outer sides. To this end, the present invention provides a double coil manufacturing device including: a frame; a bobbin which is installed on the frame and has a cylindrical shape for winding a pipe into a coil shape, and which is connected to a shaft of a motor and rotates; a pipe transfer unit which is installed on the frame and transfers the pipe to the bobbin; and a winding cover which is mounted on the bobbin and has a hollow cylindrical body which surrounds the outer periphery of the bobbin and a cut groove formed along the longitudinal direction of the body; After first winding the pipe on the bobbin, the winding cover is placed on the pipe so that the end of the wound pipe is exposed along the cut groove, and the winding cover is fixed to the bobbin, and the bobbin is rotated to secondarily wind the pipe on the winding cover.

Description

Double coil manufacturing apparatus {stainless coil winding apparatus}

The present invention relates to a double coil manufacturing device, and more specifically, to a stainless steel double coil manufacturing device of a type in which the inner and outer sides of a stainless steel pipe are formed continuously.

Heat exchangers require a large contact area per unit volume for heat transfer, and in order to obtain a large contact area, hollow pipes with an empty interior are manufactured by spirally winding the pipes. A double coil refers to a metal pipe having one inlet and one outlet pipe having a spiral coil shape to secure the maximum contact area per unit volume, and forming another spiral coil structure inside the spiral coil. Such a coil structure is commonly referred to as a double coil, and can reduce the size of the heat exchanger and increase the heat exchange efficiency.

However, since the dual coil used in the heat exchanger must load another spiral coil structure inside the spiral coil, the coil loaded inside cannot help but have a smaller cross-sectional diameter than the single coil. Accordingly, the dual coil is made by winding an aluminum pipe, but depending on the characteristics of the heat exchanger, corrosion resistance and strength are required, and in this case, a dual coil made of stainless steel is required instead of aluminum, which is easy to wind into a dual coil.

Pipes made of stainless steel have greater rigidity than pipes made of aluminum, so they are not easily coiled, and even during coiling, they have difficulty maintaining a spiral structure due to elasticity. Furthermore, when implementing a double coil, the diameter of the coil formed on the inner side becomes smaller than that on the outer side, so there is a problem that this tendency becomes very significant.

Republic of Korea Patent No. 10-1990481 (Flexible double tube and its manufacturing method) Republic of Korea Patent No. 10-1421135 (Metal plate winding device)

The purpose of the present invention is to provide a double coil manufacturing device that forms a stainless steel pipe having high rigidity and elasticity into an inner coil and an outer coil, that is, a double coil.

In addition, another object of the present invention is to provide a dual coil manufacturing device in which, when manufacturing a dual coil with a stainless steel material having strong rigidity and repulsive force, the pitch between each pipe forming the dual coil is implemented to be uniform and dense.

The above object is achieved by a dual coil manufacturing device including: a frame; a bobbin installed on the frame and having a cylindrical shape for winding a pipe into a coil shape, the bobbin being connected to a shaft of a motor and rotating; a pipe transfer member installed on the frame and transferring the pipe to the bobbin; and a winding cover mounted on the bobbin and having a hollow cylindrical body surrounding the outer periphery of the bobbin and a cut groove formed along the longitudinal direction of the body; and after first winding the pipe on the bobbin, the winding cover is placed on the pipe so that the end of the wound pipe is exposed along the cut groove, and the winding cover is fixed to the bobbin, and the bobbin is rotated to secondarily wind the pipe on the winding cover.

Here, the pipe is further provided with a fastening member that is coupled to the bobbin and fixes the pipe to the bobbin, and an end of the fastening member forms a curved portion having a curvature along the outer periphery of the pipe, and the curved portion can wrap around an area of the outer periphery of the pipe to prevent the pipe from being detached.

Here, after the winding cover is fastened to the bobbin, a winding cap fastened to the end of the bobbin may be further included to prevent the winding cover from coming off.

Here, it is preferable that the winding cap has a hollow cylindrical shape with an outer peripheral diameter smaller than the bobbin diameter and a diameter larger than the diameter of the pipe wound on the bobbin, with one side being open and the other side being formed with a cap.

Here, the winding cap may be configured to include a pipe groove formed in a circular shape along the inner bottom surface of the cylindrical shape to accommodate the pipe; a cap edge formed to protrude and form a step with an end of the pipe groove; and a gap formed in one area of the cap edge to discharge the pipe.

Here, the gap is preferably 4.5% to 11% in length relative to the diameter of the winding cap.

Here, it is preferable that the winding cover is placed on the pipe wound on the bobbin when the pipe reaches the end of the bobbin after being wound on the bobbin.

The above object is achieved, according to the present invention, by a step of fixing one side of a pipe to a bobbin that is connected to a shaft of a motor and rotates, and forming an inner coil by winding the pipe around the bobbin by rotating the bobbin; a step of preparing a hollow cylindrical body that wraps around the outer periphery of the bobbin and a winding cover having a cut groove formed along the longitudinal direction of the body, and covering the inner coil with the winding cover so that the end of the pipe is exposed along the cut groove and then fixing it; a step of fastening a winding cap to the end of the bobbin to prevent detachment of the winding cover; and a step of forming an outer coil by rotating the bobbin and winding the pipe around the outer periphery of the winding cover.

According to the present invention, a double coil formed in two layers on the inner and outer sides can be created using a pipe made of stainless steel having high rigidity and elasticity.

FIG. 1 is a perspective view of a stainless steel double coil manufacturing device according to one embodiment of the present invention.
Figures 2 to 15 illustrate perspective views of the process of winding a stainless steel pipe using the dual coil manufacturing device illustrated in Figure 1.
Figure 16 shows a cross-sectional view of the fastening piece.
Figure 17 shows a perspective view of a dual coil configuration.
Figure 18 shows a perspective view of the winding cover.
Figure 19 shows a detailed perspective view of the winding cap.
Figure 20 shows a photographic image of a winding cap that the applicant is currently commercializing.
Figure 21 illustrates a flow chart of a dual coil forming method of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a stainless steel double coil manufacturing device (hereinafter referred to as a double coil manufacturing device) according to one embodiment of the present invention, and FIGS. 2 to 15 are perspective views of a process of winding a stainless steel pipe using the double coil manufacturing device illustrated in FIG. 1.

Referring to FIGS. 1 to 15 together, a dual-coil manufacturing device (100) according to an embodiment comprises a frame (101), a motor (102), a motor support (103), a bobbin (110), and a pipe conveying unit (120). The pipe conveying unit (120) comprises a conveying rail (121), a conveying panel (122), and a conveying roller (123). The conveying roller (123) may comprise a first conveying roller (123a) and a second conveying roller (123b). The motor (102) is installed on the frame (101) and is fixed by the motor support (103). The end of the rotational axis (not shown) of the motor (102) may form a bobbin (110).

The bobbin (110) has a cylindrical shape, is formed with a uniform diameter, and may be hollow with an empty interior. On the other hand, the bobbin (110) may be implemented with a cylindrical shape with a non-empty interior to improve durability.

The outer peripheral area of the bobbin (110) is flat and a coil mount (111) having at least one fastening hole (111a) formed therein can be fastened. The coil mount (111) is fastened to a fastening piece (130) so that a stainless steel pipe (hereinafter referred to as a pipe) can rotate on the bobbin (110) while being fixed to the bobbin (110).

The fastening member (130) has a hole (131) formed at a position corresponding to the fastening hole (111a) and can be fixed to the coil mount (111) by screw connection.

In addition, the end of the fastening member (130) can be curved along the outer periphery of the pipe (P) and wrap around the outer periphery of the pipe (P) to prevent the pipe (P) from being detached. This will be explained with reference to FIG. 16.

Fig. 16 illustrates a cross-sectional view of a fastening member (130). Referring to Fig. 16 together, the fastening member (130) has a hole (131), and the hole (131) is formed at a position corresponding to the fastening hole (111a). Thereafter, the fastening member (130) can be fixed by a screw that fastens the hole (131) and the fastening hole (111a).

The end of the fastening member (130) has a curved portion (130a) having a curvature (RS) along the outer periphery of the pipe (P). When the pipe (P) is mounted on the curved portion (130a), an area of the outer periphery of the pipe (P) is wrapped by the curved portion (130a), and the pipe (P) does not come off the curved portion (130a). The pipe (P) is fixed to the fastening member (130) by the curved portion (130a) and rotates on the bobbin (110).

The pipe transport section (120) is installed on a frame (101) and has at least two transport rollers (123a, 123b) facing each other. A pair of transport rollers (123a, 123b) are installed on a roller support (124), and the roller support (124) can be installed vertically on the frame (101).

A pair of transport rollers (123a, 123b) are each composed of two or three or more rollers (a1 to a3, b1 to b3), and each roller (a1 to a3, b1 to b3) is arranged to face each other so that a pipe (P) can pass between the facing rollers (a1 to a3, b1 to b3) to flatten the pipe (P).

Here, when reference numeral 123a is referred to as a first transport roller and reference numeral 123b is referred to as a second transport roller, the first transport roller (123a) has two rollers (a1, a2) arranged on the upper side and one roller (a3) arranged on the lower side, and a space is provided between the upper rollers (a1, a2) and the lower roller (a3) that allows a pipe (P) to pass through.

On the other hand, the second transport roller (123b) has one roller (b1) arranged on the upper side and two rollers (b2, b3) arranged on the lower side, and a space is formed between the rollers (b1) and (b2, b3) that is large enough for a pipe (P) to pass through. As the pipe (P) passes through the space between the rollers (b1, b2, b3), any bent portions of the pipe (P) or portions that are not aligned in a straight line are flattened.

Since the first transfer roller (123a) and the second transfer roller (123b) are arranged in opposite directions, the pipe (P) receives a flattening treatment centered on the upper side when passing through the first transfer roller (123a), and receives a flattening treatment centered on the lower side when passing through the second transfer roller (123b), so that the pipe (P) can be flattened in a straight line overall.

When the pipe (P) is wound around the bobbin (110) to have a coil shape, the position at which the pipe (P) is wound from one end of the bobbin (110) to the other end changes over time.

If the positions of the first transport roller (123a) and the second transport roller (123b) are fixed, there is a risk that the pipe (P) will be wound while being pulled toward both ends of the bobbin (110) when the pipe (P) is wound on the bobbin (110). The pipe (P) is wound while the bobbin (110) rotates and moves between the ends on the inside of the bobbin (110), so the transport roller (123) needs to move according to the position where the pipe (P) is wound on the bobbin (110).

The conveying roller (123) is fixed to the roller support (124), and the roller support (124) can move along a pair of conveying rails (121). Although not shown in the drawing, the roller support (124) can move in the d1 direction or the d2 direction on the conveying rail (121) by a separate motor. When the pipe (P) is wound on the bobbin (110), the roller support (124) moves along the position where the pipe (P) is wound so that the pipe (P) facing the bobbin (110) from the conveying roller (123) is not pushed toward the end or inside of the bobbin (110).

Let us examine the process of winding the pipe (P) onto the bobbin (110) sequentially through FIGS. 2 to 15 again.

First, referring to Fig. 2, the flattened pipe (P) through the transfer roller (123) is aligned toward the winding position of the bobbin (110). When winding on the pipe (P) starts, the pipe (P) is wound from the inner direction (the direction close to the motor) of the bobbin (110) to the outer direction, so the transfer panel (122) moves in the d1 direction as shown in Fig. 3, and the transfer panel (122) can move to the initial position where the pipe (P) is initially wound on the bobbin (110).

Next, referring to FIG. 4, the pipe (P) extends into the inside of the bobbin (110) to reach the initial position, and at this time, the pipe (P) is aligned with the coil mount (111) of which one area of the cylindrical outer periphery of the bobbin (110) forms a plane. The coil mount (111) is provided with a pair of fastening holes (111a) for fastening with the fastening piece (130).

Next, referring to FIG. 5, after the pipe (P) is aligned to the initial position, a fastening piece (130) is coupled to the coil mount (111) to fix the pipe (P) to the bobbin (110). The hole (131) provided in the fastening piece (130) is formed to face the fastening hole (111a) provided in the coil mount (111) when the fastening piece (130) is mounted on the coil mount (111), and the fastening piece (130) can be fixed to the coil mount (111) by screw coupling. The form in which the fastening piece (130) is fixed to the coil mount (111) is as illustrated in FIG. 6.

Next, referring to FIGS. 7 to 9, the pipe (P) is wound on the bobbin (110) by the rotation of the bobbin (110) at the initial position of the bobbin (110). As the pipe (P) is wound on the bobbin (110), the pipe (P) is wound tightly on the bobbin (110) as shown in FIG. 8, and when the wound pipe (P) reaches the end of the bobbin (110) as shown in FIG. 9, the motor (102) temporarily stops the rotation of the bobbin (110).

Next, referring to Fig. 10, when the motor (102) stops rotating, the winding cover (140) is placed on the bobbin (110) on which the pipe (P) is wound.

The winding cover (140) is formed at the end of the cylindrical body (141) and is provided with a flange (142) for fastening with the bobbin (110). This will be described with reference to FIG. 18. Referring to FIG. 18, a flange fastening hole (143) for fastening with the motor support (103) is provided at an equal angle on the flange (142) of the winding cover (140).

Fig. 18 illustrates an example in which three flange fastening holes (143) are arranged at an angle of 120 degrees. It is obvious that more than the three illustrated in Fig. 10 may be provided.

The flange (142) is formed to be larger than the diameter of the cylindrical body (141), and an opening (OP) is formed by cutting an area in the direction of the body (141) on one side, and a cutting groove (T) can be formed along the length direction of the bobbin (110) at one end of the opening (OP). The opening (OP) exposes one end (S1) of the pipe that is not wound on the bobbin (110) when initially wound on the bobbin (110) so as not to cause interference when the pipe (P) is wound a second time to form a double coil.

The cutting groove (T) exposes the other end (S2) of the pipe (P) that starts the second winding after the pipe (P) is first wound to the end of the bobbin (110), and can guide the other end (S2) of the pipe (P) to the outer periphery of the winding cover (140).

The winding cover (140) can be placed on the bobbin (110) after the pipe (P) completes the first winding on the bobbin (110), that is, when the pipe (P) reaches the end of the bobbin (110).

When the winding cover (140) illustrated in FIG. 10 is put on the bobbin (110) on which the pipe (P) is first wound, the shape is as illustrated in FIG. 11. As illustrated in FIG. 11, the winding cover (140) exposes one end (S1) of the pipe (P) and guides the other end (S2) to the outer periphery of the winding cover (140) so that the other end (S2) can perform a second winding at the outer periphery of the winding cover (140).

Next, referring to FIG. 12, after the winding cover (140) is fastened to the bobbin (110), a winding cap (145) can be fastened to the end of the bobbin (110) to prevent the winding cover (140) from being detached from the bobbin (110).

The winding cap (145) has a cylindrical shape with an opening formed on one side, a cap (145b) formed on the other side, and the opening is inserted along the inner circumference of the bobbin (110).

In addition, a plurality of screw holes (145a) are formed in the cap (145b) and are screw-connected to the screw holes (110a) formed at the end of the bobbin (110) so that the winding cap (145) can fix the winding cover (140). Fig. 13 shows a shape in which the winding cap (145) is screw-connected to the bobbin (110) so as to fix the winding cover (140) to the bobbin (110).

The winding cap (145) has a cylindrical shape in which the outer circumferential diameter is smaller than the bobbin diameter (110) and larger than the diameter of the bobbin (110) in which the pipe (P) is first wound around the bobbin (110). Accordingly, the winding cap (145) is connected to the end of the winding cover (140) in which the pipe (P) is first wound around the bobbin (110) to prevent the winding cover (140) from being separated from the bobbin (110).

Fig. 14 shows a state in which the motor (102) starts driving again after the winding cover (140) is fastened to the bobbin (110) by the winding cap (145) and the second winding is performed on the bobbin (110). The second winding is performed on the pipe (P) on the winding cover (140), and as shown in Fig. 15, when the pipe (P) is wound toward the inside of the bobbin (110), i.e., toward the motor (102), the second winding is completed. The shape of the pipe (P) that has completed the second winding is as shown in Fig. 17. The pipe shown in Fig. 17 is composed of an inner coil (P1) that has been first wound and an outer coil (P2) that has been secondarily wound, and is referred to as a double coil. In order to form a double coil with stainless steel material, a winding cover (140) and a winding cap (145) according to an embodiment are required. This is because, when the pipe (P) is made of stainless steel, the rigidity and elasticity of the pipe (P) and the repulsive force generated during winding are strong, so that when forming a double coil with the winding cover (140), the shapes of the inner coil (P1) and the outer coil (P2) are not uniformly implemented and they spread out toward the outer periphery or try to return to their original shape. After forming the inner coil (P1), the winding cover (140) is covered to suppress the repulsion and elasticity of the inner coil (P1), and then, a second winding is performed on the winding cover (140) to suppress the repulsion and elasticity generated when winding the pipe (P) onto the bobbin (110).

Figure 19 shows a detailed perspective view of a winding cap, and Figure 20 shows a photographic image of a prototype that the applicant is currently commercializing.

Referring to FIGS. 19 and 20, the winding cap (145) has a pipe groove (145c) along the inner periphery of the cap (145b) in which a pipe (P) is to be seated. The pipe groove (145c) extends in a circular shape on the inner side of the cap, and as it approaches the cap edge (145d) that is formed by protruding with a step from the pipe groove (145c), it abruptly follows in the direction of the gap of the cap edge (145d) and changes into an elliptical shape.

A gap is formed in the cap edge (145d) for discharging the pipe (P), and the width (d3) of the gap needs to be suppressed so that it is sufficient for discharging the pipe (P) but not too long. If the length (d3) of the gap becomes long, when the pipe (P) is wound a second time on the bobbin (110), the pipe (P) may not be supported by the gap, and thus the shape of the pipe (P) may not maintain a perfect circular shape and may be deformed.

The length (d3) of the gap can be formed in a range of 4.5% to 11% of the diameter (R) of the winding cap (145). If it is smaller than this, there is a concern that the pipe (P) may become caught in the pipe groove (145c), making it difficult to remove the winding cap (145) later. On the other hand, if the length of the gap is 12% or more of the inner diameter (R) of the pipe (P) guided along , there is a concern that the shape of the double coil, especially the outer coil (P2), may be deformed during the second winding because the pipe (P) is not sufficiently supported by the gap.

Figure 21 illustrates a flow chart for a dual coil winding method according to one embodiment of the present invention.

The description of Fig. 21 will be explained with reference to Figs. 1 to 20 described above. First, in order to wind a double coil, one side of a pipe (P) is fixed to a bobbin (110) (S10), and after the pipe (P) is fixed, the bobbin is rotated to form an inner coil (P1) (S11).

The bobbin (110) may be formed in a cylindrical shape so that the pipe (P) can be wound in a circular shape, and may be formed with an empty interior or may be formed with a non-empty interior to maintain rigidity.

The pipe (P) can be fixed by a fastening member (130) that is positioned on the coil mount (111) and then screw-connected with the coil mount (111). As shown in Fig. 16, the fastening member (130) has a curved portion (130a) at the end and has a structure that surrounds an area of the outer periphery of the pipe (P). This prevents the pipe (P) from being separated from the curved portion (130a), and when the bobbin (110) rotates, the pipe (P) can be wound according to the rotation of the bobbin (110).

Next, when the inner coil (P1) is formed on the bobbin (110), the winding cover (140) can be mounted and fixed by covering the inner coil (P1) (S12). The winding cover (140) is provided to distinguish the inner coil (P1) and the outer coil (P2). The winding cover (140) has a cutting groove (T) on one side of the cylindrical outer periphery so that the pipe (P1) can be wound continuously from the inner coil (P1) to the outer coil (P2) while being wound on the bobbin (110). The inner coil (P1) that has been wound is exposed outside the winding cover (140) through the cutting groove (T), and the winding of the outer coil (P2) can start on the winding cover (140).

Next, after the winding cover (140) is placed on the inner coil (P1), the winding cap (145) is fastened to the winding cover (140) (S13). After the winding cap (145b) is fastened and fixed to the winding cover (140), the bobbin (110) rotates, and the outer coil (P2) is wound on the winding cover (140), so that a double coil of the form illustrated in Fig. 17 can be formed (S14).

100: Dual coil manufacturing device 101: Frame
102: Motor 103: Motor support
110: Bobbin 120: Pipe conveyor
121: Transfer rail 122: Transfer panel
123: Transfer roller 123a: First transfer roller
123b: Second transfer roller a1, a2, a3, b1, b2, b3: Roller

Claims (8)

frame;
A bobbin installed on the above frame, having a cylindrical shape for winding the pipe into a coil shape, and connected to the shaft of the motor to rotate;
A pipe transport unit installed on the above frame and transporting the pipe to the bobbin; and
A winding cover mounted on the bobbin and having a hollow cylindrical body that surrounds the outer circumference of the bobbin and a cutting groove formed along the length of the body;
Including,
A dual coil manufacturing device characterized in that after first winding the pipe on the bobbin, the winding cover is placed on the pipe so that the end of the wound pipe is exposed along the cutting groove, the winding cover is fixed to the bobbin, and the pipe is secondarily wound on the winding cover by rotating the bobbin. In the first paragraph,
Further comprising a fastening member coupled to the bobbin and fixing the pipe to the bobbin;
A double coil manufacturing device characterized in that the end of the above-mentioned fastening piece forms a curved portion having a curvature along the outer periphery of the above-mentioned pipe, and the curved portion wraps around a region of the outer periphery of the above-mentioned pipe to prevent the pipe from being detached. In the first paragraph,
A dual coil manufacturing device characterized by further including a winding cap that is fastened to an end of the bobbin to prevent the winding cover from coming off after the winding cover is fastened to the bobbin. In the third paragraph,
The above winding cap is,
The outer circumference diameter is smaller than the bobbin diameter, and the pipe has a hollow cylindrical shape larger than the diameter wound on the bobbin.
A dual coil manufacturing device characterized in that one side is open and the other side is formed with a cap. In paragraph 4,
The above winding cap is,
A pipe groove formed in a circular shape along the inner bottom surface of the above cylindrical shape to accommodate the pipe;
A cap edge formed by protruding and forming a step with the end of the pipe groove; and
A dual coil manufacturing device characterized by including a gap formed in one area of the cap edge for the pipe discharge. In paragraph 5,
The above gap is,
A dual coil manufacturing device characterized in that the length is 4.5% to 11% of the diameter of the above-mentioned winding cap. In the first paragraph,
The above winding cover,
A double coil manufacturing device characterized in that after the pipe is wound on the bobbin, it is covered over the pipe wound on the bobbin when it reaches the end of the bobbin. A step of forming an inner coil by fixing one end of a pipe to a bobbin that is connected to a shaft of a motor and rotates, and winding the pipe around the bobbin by rotating the bobbin;
A step of preparing a hollow cylindrical body that wraps around the outer circumference of the bobbin and a winding cover having a cut groove formed along the length of the body, and fixing the cover by covering it over the inner coil so that the end of the wound pipe is exposed along the cut groove;
A step of attaching a winding cap to the end of the bobbin to prevent the winding cover from coming off; and
A method for manufacturing a dual coil manufacturing device, comprising: a step of forming an outer coil by rotating the bobbin and winding the pipe around the outer periphery of the winding cover;

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