Heating coil preparation apparatus and method

Abstract

The application discloses a heating coil preparation device and a preparation method. The heating coil preparation device comprises a pipe material unwinding mechanism, a traction pipe cutting mechanism, a first conveying table, a pipe lifting mechanism, a second conveying table and a coil workbench which are sequentially arranged. The pipe material unwinding mechanism comprises a material roll mounting roller. The traction pipe cutting mechanism is used for conveying and cutting the unwound pipe material. The first conveying table is provided with a conveying belt. The pipe lifting mechanism and the second conveying table are oppositely arranged and respectively located at two sides of the first conveying table. The second conveying table is provided with a guide groove which is perpendicular to the conveying direction of the conveying belt. The inlet of the guide groove is opposite to the pipe lifting mechanism, and the end of the guide groove extends to the coil workbench. The pipe lifting mechanism is used for bending the pipe material on the conveying belt and lifting the pipe material into the guide groove. The coil workbench is provided with a rotating disc. A pair of spaced pipe winding columns are arranged on the rotating disc. The pipe winding columns are located in the central region of the rotating disc and protrude from the surface of the rotating disc. The application reduces the working strength and improves the efficiency.

Description

Technical Field

[0001] This invention belongs to the field of medical device manufacturing equipment technology, specifically relating to a preparation device and method for a heating coil used in blood purification equipment. Background Technology

[0002] Blood purification involves using blood purification equipment, tubing, and consumables to purify blood. During the process, blood is introduced into the body through the tubing, purified by the purification module, and then returned to the body. To ensure the returned blood reaches a safe temperature, a heating device is used. This heating device primarily consists of a heating coil and a heating plate. The heating coil has a planar spiral structure; blood is introduced into the coil, and the heating plate heats the blood within.

[0003] Currently, heating coils are mainly manufactured manually by operators. The operator folds a pre-cut circular PVC plastic hose in half, then rotates it outwards from the bend at the fold to form a planar spiral coil. Adhesive is then applied between adjacent coils to bond them together. This manual coiling method is cumbersome, labor-intensive, and inefficient. Furthermore, the existing coiling process involves folding the hose in half and then coiling it. Because the inner and outer layers of the coil have different diameters, the lengths of the two coils at the end of the heating coil are inconsistent, requiring the excess material to be cut off, resulting in material waste. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for preparing a heating coil for use in blood purification equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A heating coil preparation apparatus includes: a pipe unwinding mechanism, a traction pipe cutting mechanism, a first conveying platform, a pipe jacking mechanism, a second conveying platform, and a coil worktable arranged sequentially; the pipe unwinding mechanism includes a material roll mounting roller for placing coiled hose raw materials; the traction pipe cutting mechanism is used to convey the unwound pipe forward and cut the pipe; a conveyor belt is provided on the first conveying platform, and the conveyor belt conveys the pipe along the traction direction of the traction pipe cutting mechanism; the pipe jacking mechanism and the second conveying platform are arranged opposite each other and are respectively located on both sides of the first conveying platform, and a guide groove is provided on the second conveying platform with an extension direction perpendicular to the conveying direction of the conveyor belt, the inlet of the guide groove is opposite to the pipe jacking mechanism, and the end extends to the coil worktable; the pipe jacking mechanism is used to bend the pipe on the conveyor belt and push the pipe into the guide groove; a turntable for winding the pipe is provided on the coil worktable, and a pair of spaced-apart winding posts are provided on the turntable, the winding posts being located in the central area of ​​the turntable and protruding from the surface of the turntable.

[0007] As can be seen from the above technical solutions, the heating coil preparation device of the present invention can automatically complete a series of operations such as traction, cutting, and winding. One operator can complete the above steps, reducing workload and improving efficiency.

[0008] As described above, in the heating coil preparation device, optionally, the traction cutting mechanism includes a straightening assembly composed of several pairs of straightening rollers and a cutter disposed after the straightening assembly. The straightening rollers are arranged in pairs facing each other, and the pipe passes between the vertically opposite straightening rollers. When the straightening rollers rotate, they transport the pipe forward.

[0009] In the heating coil preparation apparatus described above, optionally, the jacking mechanism includes a jacking rod and a jacking rod driving unit that drives the jacking rod to move horizontally. The moving direction of the jacking rod is perpendicular to the conveying direction of the conveyor belt. When the jacking rod extends, it pushes the tube into the guide groove. The setting position of the jacking mechanism is adjustable. The distance between the jacking rod and the cutter is D = (L - ΔL) / 2, where L is the total length L of the heating coil tube, and ΔL is the difference in tube length between the inlet and outlet of the heating coil.

[0010] The difference in pipe length between the inlet and outlet of the heating coil prepared by symmetrical bending at the midpoint is obtained. Based on the difference in pipe length between the inlet and outlet of the heating coil, the position of the jacking mechanism from the cutter is set. The difference in length between the bend and the beginning and end of the pipe is changed during pipe production to make up for the difference in pipe length after coiling. This makes the inlet and outlet of the prepared coiled pipe flush, eliminating the need for secondary cutting and avoiding material waste.

[0011] Optionally, in the heating coil preparation apparatus described above, a branch pipe pile located on the centerline of the guide groove is provided at the inlet of the guide groove. The branch pipe pile can be raised and lowered in the vertical direction, thereby protruding from the bottom surface of the guide groove or lowered to at least be flush with the bottom surface of the guide groove.

[0012] The guide groove is equipped with branch pipe piles, which allows the bent pipe to move along a fixed direction to the coiling workbench, avoiding knots at the end of the pipe and facilitating subsequent coiling operations.

[0013] In the heating coil preparation apparatus described above, optionally, the turntable is provided with a spiral coil guide groove, and the tube is located in the coil guide groove.

[0014] The guide grooves on the turntable limit the movement of the pipe, ensuring that the pipe is always coiled around the center on the same plane to achieve the desired coil shape.

[0015] In the heating coil preparation apparatus described above, optionally, at least two adsorption grooves extending radially along the turntable are provided on the turntable, the adsorption grooves are evenly spaced along the circumference of the turntable, and the adsorption grooves are connected to an air pump via an air pipe.

[0016] An adsorption tank is set on the turntable. The adsorption tank is connected to an air pump through an air pipe. By evacuating the air in the tank to create negative pressure, the coil is adsorbed onto the turntable, preventing the tube from spreading out and ensuring the fit and shape of the coil tube.

[0017] The heating coil preparation apparatus described above may optionally include a pressure plate that can completely cover the turntable. The lower surface of the pressure plate is provided with a groove that cooperates with the winding column, and the depth of the groove is adjustable.

[0018] The pressure plate limits the movement of the pipe, ensuring it remains coiled around the center on the same plane to achieve the desired coil shape.

[0019] The present invention also provides a method for preparing a heating coil using the aforementioned heating coil preparation apparatus, comprising the following steps:

[0020] The rolled hose material is installed onto the roll mounting roller, and the head of the hose is pulled by the traction cutting mechanism, which pulls the hose forward.

[0021] The pipe jacking mechanism bends the cut pipes on the conveyor belt and pushes them into the guide groove;

[0022] Hold the bend in the pipe and guide it along the guide groove to the coiling workbench. Place the bend onto one of the winding columns of the turntable and start the turntable to rotate. The pipe is coiled around the bend as the center and along the winding column to form a heating coil.

[0023] The heating coil preparation method described above further includes the following steps:

[0024] The position of the jacking mechanism is set such that the distance from the tail of the cut pipe to the jacking rod is (L-ΔL) / 2. The difference in pipe length ΔL between the inlet and outlet of the heating coil is determined in advance using the following method:

[0025] After the cut pipe is folded in half from the midpoint, the heating coil is obtained by winding around the folded position. The length difference between the tail ends of the inner and outer layers of the heating coil is taken as the pipe length difference ΔL between the inlet and outlet of the heating coil. The length of the cut pipe is equal to the total length L of the pipe of a heating coil.

[0026] The traction speed v of the traction pipe cutting mechanism and the time interval t for the pipe cutting operation are set so that the length v×t of the pipe obtained after each cutting action is equal to the total length L of the pipe of a heating coil.

[0027] The heating coil preparation method described above further includes the following steps:

[0028] After the winding is completed, the PVC film is covered on the heating coil, the welding machine is started, and the welding head mold is lowered to press the PVC film.

[0029] The outlet of the heating coil is clamped, the inlet is connected to a compressed air source, and sufficient air is injected into the pipeline of the heating coil. The welding machine welds the heating coil to the PVC diaphragm.

[0030] Raise the welding head mold, turn off the suction pump, and remove the welded heating coil to complete the preparation of the heating coil. Attached Figure Description

[0031] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the heating coil preparation device according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the traction pipe cutting mechanism according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram showing the positions of the pipe jacking mechanism and the guide groove in an embodiment of the present invention;

[0035] Figure 4This is a schematic diagram of the structure of the coil workbench according to an embodiment of the present invention;

[0036] Figure 5 This is a top view of the turntable according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the pressure plate structure according to an embodiment of the present invention;

[0038] Figure 7 This is a structural schematic diagram of the pressure plate from another angle in an embodiment of the present invention.

[0039] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings. In the detailed description of the embodiments of the present invention, for ease of explanation, the drawings illustrating the device structure will be partially enlarged without adhering to the general scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of the present invention. It should be noted that the drawings are in a simplified form and use non-precise scales, solely for the purpose of conveniently and clearly illustrating the embodiments of the present invention. Additionally, in the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Terms such as "positive," "negative," "bottom," "upper," and "lower" indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] like Figure 1 As shown, the heating coil preparation device in this embodiment includes a pipe unwinding mechanism 1, a traction pipe cutting mechanism 2, a pipe jacking mechanism 3, a first conveying table 4, a second conveying table 5, and a coil worktable 6.

[0043] The pipe unwinding mechanism 1 is used to unwind the hose material. The pipe unwinding mechanism 1 includes a frame 1-1 and a material roll mounting roller 1-2 set on the frame 1-1. The coiled hose material is mounted on the material roll mounting roller 1-2. The material roll mounting roller 1-2 can rotate around its own axis, thereby realizing the unwinding of the pipe.

[0044] The traction and cutting mechanism 2 is located at the discharge end of the pipe unwinding mechanism 1, and is used to provide horizontal support for the unwound pipe. Figure 2 The traction force (in the direction indicated by the middle arrow) propels the pipe to the first conveyor platform 4. Combined with... Figure 1 and Figure 2 The traction pipe cutting mechanism 2 in this embodiment includes a cabinet 2-1, straightening rollers 2-2, and a cutter 2-3. A control console 2-4 is also provided on the cabinet 2-1, allowing the operator to control the start and stop of the equipment and set its operating parameters. The cabinet 2-1 has several pairs of straightening rollers 2-2, each pair positioned vertically opposite each other. The pipe can pass between the vertically opposite rollers 2-2. Each roller is driven by a roller rotation drive unit (not shown) and can rotate around its own axis. These pairs of straightening rollers form a straightening assembly. When the straightening rollers 2-2 rotate, the friction between them and the pipe causes the pipe to move forward and straightens it while driving the pipe horizontally, preventing bending and deformation that could affect the quality of the coil. The cutter 2-3 is positioned after the straightening assembly (straightening rollers) in the pipe's moving direction. That is, the pipe is first straightened by the straightening rollers 2-2, and then cut by the cutter 2-3. The cutting action of the cutter 2-3 can be achieved by a conventional drive unit such as a cylinder or motor. To accommodate pipes of different diameters, preferably, the distance between the vertically opposed straightening rollers 2-3 is adjustable. For pipes with larger diameters, the distance between the vertically opposed straightening rollers 2-3 is larger, and for pipes with smaller diameters, the distance is smaller.

[0045] The first conveyor platform 4 is located at the discharge end of the traction pipe cutting mechanism 2, and its extension direction is consistent with the direction in which the traction pipe cutting mechanism 2 pulls the pipe. A conveyor belt 4-1 is installed on the first conveyor platform 4, and the conveyor belt 4-1 is driven by a motor to convey the pipe along the extension direction of the first conveyor platform 4. Figure 3 As shown, the pipe 100 falls onto the conveyor belt 4-1, and is then transported by the conveyor belt 4-1 in the traction direction of the traction pipe cutting mechanism 2.

[0046] The pipe jacking mechanism 3 and the second conveyor platform 5 are respectively located on both sides of the first conveyor platform 4, with the pipe jacking mechanism 3 and the second conveyor platform 5 facing each other, and the second conveyor platform 5 and the first conveyor platform 4 being perpendicular. Figure 1 and Figure 3As shown, the pipe jacking mechanism 3 includes a jacking rod 3-1 and a jacking rod drive unit 3-2 that drives the jacking rod 3-1 to move horizontally. The moving direction of the jacking rod 3-1 is perpendicular to the conveying direction of the conveyor belt 4-1. A guide groove 5-1 is provided on the second conveyor table 5. The extension direction of the guide groove 5-1 is perpendicular to the conveying direction of the conveyor belt 4-1. The inlet of the guide groove 5-1 is opposite to the jacking rod 3-1, and the end of the guide groove 5-1 extends to the coil worktable 6. The guide groove 5-1 is used to guide the movement of the pipe.

[0047] When the push rod 3-1 extends forward under the control of the push rod drive unit 3-2, it can press against the pipe 100 on the conveyor belt 4-1, causing the pipe 100 to bend and push it into the guide groove 5-1. The bending angle of the pipe 100 after being pressed by the push rod 3-1 is 180°, thus bending the pipe 100 from one pipe into two parallel pipe sections. The position where the push rod 3-1 presses against the pipe 100 is the bending point of the pipe when winding the coil. When winding the coil, it rotates outward from this bending point to form a planar spiral heating coil. After the push rod 3-1 pushes the pipe 100 into the guide groove 5-1, the push rod drive unit 3-2 controls the push rod 3-1 to retract, without affecting the conveying of the next section of pipe. In this embodiment, the push rod drive unit 3-2 is a cylinder.

[0048] To accommodate the winding operation of pipes of different lengths, preferably, the position of the jacking mechanism 3 is adjustable and can be set at any position in the conveying direction of the conveyor belt 4-1 according to production needs. That is, the distance D from the tail of the cut pipe to the jacking rod 3-1 can be adjusted as needed (D is also the distance between the jacking rod 3-1 and the cutter 2-3). When the position of the jacking mechanism 3 changes, the position of the second conveying table 5 also changes accordingly, so that the jacking rod 3-1 can push the pipe into the guide groove 5-1.

[0049] To prevent the pipe 100 from tangling or knotting while moving within the guide groove 5-1, preferably, a branch pipe post 7 is provided within the guide groove 5-1. The branch pipe post 7 is located on the centerline of the guide groove 5-1. When the bent pipe 100 moves along the guide groove 5-1, it can be separated by the branch pipe post 7, thereby preventing the pipe from tangling or knotting. In this embodiment, the branch pipe post 7 is located at the entrance of the guide groove 5-1 and can move vertically to achieve lifting and lowering. After the pipe 100 is cut, the push rod 3-1 pushes the pipe 100 into the guide groove 5-1. At this time, the branch pipe post 7 is in a descending and retracting state, lowered to at least flush with the bottom surface of the guide groove 5-1, without affecting the operation of the push rod 3-1 to bend the pipe 100 and push it into the guide groove. After the pipe 100 is pushed into the guide groove 5-1, the branch pipe pile 7 rises and protrudes from the bottom surface of the guide groove 5-1, thereby separating the two bent pipes and preventing the pipe ends from getting tangled due to excessive length. The raising and lowering of the branch pipe pile 7 can be controlled by conventional drive units such as cylinders and motors.

[0050] Combination Figure 1 , Figure 4 and Figure 5 In this embodiment, a turntable 6-1 is provided on the coil workbench 6. The turntable 6-1 is rotatably mounted on the coil workbench 6 around its own axis. The rotation of the turntable 6-1 is driven by a turntable rotation drive unit 6-2 located inside the coil workbench 6 cabinet. In this embodiment, the turntable rotation drive unit 6-2 is a motor. The output shaft of the motor is connected to the rotating shaft 6-1a of the turntable 6-1 through a transmission structure, thereby driving the turntable 6-1 to rotate.

[0051] A pair of spaced-apart winding posts 6-1b are provided on the turntable 6-1. The winding posts 6-1b protrude from the surface of the turntable 6-1 and are located in the central area of ​​the turntable 6-1. When winding the tube, the bend of the tube is placed on one of the winding posts 6-1b. Then the turntable 6-1 rotates, and the winding posts 6-1b rotate with the turntable, so that the tube is wound around the two winding posts 6-1b layer by layer with the bend as the center, thus realizing the operation of winding the tube.

[0052] In order to ensure uniform gaps between the layers of pipes in the heating coil and to ensure the aesthetics of the coil, preferably, a spiral coil guide groove 6-1c is provided on the turntable 6-1. When the turntable 6-1 rotates, the pipe is located in the coil guide groove 6-1c and coils along the coil guide groove 6-1c, thereby ensuring uniform gaps between the layers of the coil.

[0053] The plastic tubing used in coiling typically has a certain degree of elasticity. When coiling on the same horizontal plane, the tubing may not adhere properly, resulting in unevenness and an inability to maintain its shape, making it prone to unraveling. To prevent the tubing from unraveling during coiling, a preferred embodiment includes an adsorption groove 6-1d on the turntable 6-1. The adsorption groove 6-1d is connected to an air pump 6-4 via an air pipe 6-3. When the air pump 6-4 operates, it creates a negative pressure in the adsorption groove 6-1d, thereby firmly adsorbing the tubing onto the turntable 6-1, preventing it from unraveling and maintaining its flatness and tightness. Optionally, at least two adsorption grooves 6-1d are provided on the turntable 6-1, extending radially along the turntable 6-1. In this embodiment, three radially extending adsorption grooves 6-1d are provided on the turntable 6-1, evenly spaced around the circumference of the turntable, which can apply a uniform adsorption force to the tubing, preventing it from unraveling. Adsorption tanks can also be replaced by adsorption holes, but adsorption tanks have a large adsorption area and can have a stronger adsorption force on pipes.

[0054] To prevent the tubing from overlapping vertically during the coil winding process, this embodiment preferably includes a pressure plate 8. The size of the pressure plate 8 is adapted to the size of the turntable 6-1, and can completely cover the turntable 6-1. The pressure plate 8 can be placed on top of the turntable 6-1 during coil winding. Figure 6 and Figure 7 As shown, the upper surface of the pressure plate 8 in this embodiment is provided with a handle 8-1 for easy placement and removal of the pressure plate 8, and the lower surface of the pressure plate 8 is provided with a groove 8-2 that mates with the winding pipe column 6-1b. When the pressure plate 8 is placed on the turntable 6-1, the winding pipe column 6-1b extends into the groove 8-2, allowing the pressure plate 8 to rotate with the turntable 6-1. The distance between the bottom surface of the pressure plate 8 and the turntable 6-1 is controlled by the depth of the groove 8-2, ensuring that only a single pipe can pass through, thus preventing pipe stacking. The depth of the groove 8-2 is adjustable; for example, pads of different thicknesses can be placed in the groove 8-2 to change the distance between the pressure plate 8 and the turntable 6-1, accommodating pipes of different diameters and enabling the production of coils of different diameters.

[0055] The heating coil preparation apparatus further includes a welding machine (not shown), which can be a high-frequency welding machine, used to weld PVC film onto the heating coil obtained after the coiling operation. Before welding, sufficient air is first filled into the heating coil, and then the PVC film is welded onto the surface of the heating coil.

[0056] The following describes the method for preparing heating coils using the heating coil preparation apparatus of the present invention. The preparation method includes the following steps:

[0057] The rolled hose material is installed onto the material roll mounting roller 1-2 of the pipe unwinding mechanism 1, and the head of the hose is pulled by the traction cutting mechanism 2. After the equipment is started, the traction cutting mechanism 2 pulls the pipe forward to perform cutting, bending, and coiling operations to prepare a heating coil. Specifically, after the pipe is cut, the push rod 3-1 extends forward, causing the cut pipe to bend and be pushed into the guide groove 5-1. Then the branch pipe pile 7 is raised to prevent the two sections of pipe after bending from tangling or knotting. The operator manually or with a robot pulls the bend of the pipe and pulls the pipe along the guide groove 5-1 to the coiling worktable 6. The bend is then placed on a winding column 6-1b of the turntable 6-1. The turntable 6-1 is then started to rotate, and the pipe is coiled layer by layer along the periphery of the winding column with the bend as the center, finally completing the coiling. Using the heating coil preparation device of the present invention to produce heating coils, only one person is needed to complete the assembly line hose coiling operation, saving costs and improving efficiency.

[0058] Furthermore, if the traction speed of the traction cutting mechanism 2 is set to v, and the time interval for the cutter to cut the pipe is t, then the length of the pipe obtained after each cutting action is v×t, which should be equal to the total length L of the pipe used to prepare a heating coil. In production, the total length L of the pipe used to prepare a heating coil is determined based on the heating power of the blood purification equipment. L is affected by the heating power P of the blood purification equipment and the diameter Φ of the heating coil, where L=α1×P+β1×Φ+ε, α1 is the heating power influence coefficient, P is the heating power, β1 is the diameter influence coefficient, Φ is the diameter of the heating coil, and ε is a constant factor.

[0059] The existing coiling process involves folding the cut tubing in half at its midpoint. The two folded sections are then coiled around the fold. During coiling, one section is on the inner layer, and the other on the outer layer. The inner section is closer to the geometric center of the heating coil, while the outer section is further away. Because the two sections are the same length but have different coiling diameters, a length difference ΔL exists between the ends of the two layers after processing. For clarity, this length difference (ΔL) between the ends of the inner and outer layers of tubing produced using the conventional process (folding in half at the midpoint) is defined as the inlet / outlet length difference (ΔL) of the heating coil. To eliminate this inlet / outlet length difference and make the ends of the inner and outer layers flush, the excess portion (ΔL) of one layer needs to be cut off, resulting in material waste. Since the total length L of the pipe is affected by the heating power P and the diameter Φ of the heating coil, ΔL is also affected by the heating power P and the diameter Φ of the heating coil, ΔL=α2×P+β2×Φ+ε. The difference in pipe length (ΔL) between the inlet and outlet of the heating coil can be determined before the formal fabrication of the heating coil by prefabricating the heating coil in the conventional process of folding it in half at the midpoint, and then based on the length difference between the tail ends of the inner and outer layers of the heating coil.

[0060] To avoid a length difference between the inner and outer layers of the pipe after coiling, this invention does not bend the pipe at the midpoint after cutting. The bending position in this invention is the distance D from the tail of the cut pipe to the top rod 3-1 (D is also the distance between the top rod 3-1 and the cutter 2-3), where D = (L - ΔL) / 2. This allows the distance difference between the two ends of the pipe to the bending point to compensate for the length difference ΔL (the difference in pipe length between the inlet and outlet of the heating coil) required for the inner and outer layers of the pipe after coiling, so that the opening of the finished coiled pipe is flush and does not need to be cut.

[0061] Based on the relationship between the length (L, ΔL) of the tube, the heating power P, and the diameter Φ of the heating coil, the following steps are also included in the preparation of the heating coil:

[0062] The total length L of the heating coil (i.e., the total length of the heating coil tubing) and the length difference ΔL between the inlet and outlet of the heating coil prepared by symmetrical bending at the midpoint of the cut tubing length are used to determine the setting position of the top rod 3-1, so that the distance from the tail of the cut tubing to the top rod is (L-ΔL) / 2, that is, the distance D between the top rod 3-1 and the cutter 2-3 is (L-ΔL) / 2.

[0063] Taking the production of a 5.9mm diameter heating coil as an example, the heating power of the blood purification equipment using this heating coil is 80W. The total length L of the cut tube is 6m. The length difference ΔL between the inlet and outlet of the heating coil obtained by bending it at the midpoint of 6m and then coiling it is 0.2m. The traction speed v of the traction cutting mechanism 2 and the time interval t between the cutter and the tube should satisfy v×t=6m. The traction speed v of the traction cutting mechanism 2 is set to 12m / s, the time interval t between the cutter and the tube is set to 0.5s, and the distance D between the top rod 3-1 and the cutter 2-3 is 2.9m. This ensures that the length difference ΔL between the inlet and outlet of the heating coil is 15~20cm (15~20cm is the test result and is related to the diameter and total length of the coil).

[0064] After the top rod position is set, the top rod works once every 0.5 seconds when the conveyor belt runs, pushing the pipe into the guide groove, then moving the bent pipe along the guide groove, and putting the bent part on the winding column, covering it with the pressure plate, starting the turntable, and winding the pipe into a disc-shaped pipeline.

[0065] During the winding process, the suction pump is started to create a negative pressure around the adsorption tank, which sucks the tube onto the turntable and fixes the shape of the disc tube.

[0066] After winding, remove the pressure plate and cover the disc-shaped tube (heating coil) with the PVC diaphragm. Start the welding machine, lowering the welding head mold to press against the diaphragm. Clamp the outlet of the disc-shaped tube (heating coil) and connect the inlet to a compressed air source, filling the tube with sufficient air. The welding machine then welds the tube and diaphragm together. Finally, raise the welding head mold, turn off the suction pump, and remove the welded heating coil, completing the preparation of the heating coil.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heating coil preparation apparatus, characterized in that, include: The pipe unwinding mechanism, traction pipe cutting mechanism, first conveying platform, pipe jacking mechanism, second conveying platform and pipe coiling worktable are arranged in sequence. The pipe unwinding mechanism includes a coil mounting roller for placing coiled hose raw material; The traction pipe cutting mechanism is used to transport the unwound pipe forward and cut the pipe. The traction pipe cutting mechanism includes a cutter. The first conveyor platform is equipped with a conveyor belt, which conveys the pipe material along the traction direction of the traction pipe cutting mechanism; The pipe jacking mechanism and the second conveying platform are arranged opposite each other and are located on both sides of the first conveying platform. The second conveying platform is provided with a guide groove whose extension direction is perpendicular to the conveying direction of the conveyor belt. The inlet of the guide groove is opposite to the pipe jacking mechanism and the end extends to the coil worktable. The pipe jacking mechanism is used to bend the pipe on the conveyor belt and push the pipe into the guide groove. The pipe jacking mechanism includes a jacking rod and a jacking rod driving unit that drives the jacking rod to move horizontally. The moving direction of the jacking rod is perpendicular to the conveying direction of the conveyor belt. When the jacking rod extends, it pushes the pipe into the guide groove. The setting position of the pipe jacking mechanism is adjustable. The distance D between the jacking rod and the cutter is D=(L-ΔL) / 2, where L is the total length L of the pipe of a heating coil, and ΔL is the difference in pipe length between the inlet and outlet of the heating coil. The coiling workbench is equipped with a turntable for winding tubes. A pair of spaced-apart winding posts are arranged on the turntable. The winding posts are located in the central area of ​​the turntable and protrude from the surface of the turntable.

2. The heating coil preparation apparatus as described in claim 1, characterized in that: The traction pipe cutting mechanism includes a straightening assembly consisting of several pairs of straightening rollers and a cutter located after the straightening assembly. The straightening rollers are arranged in pairs facing each other, and the pipe passes between the vertically opposite straightening rollers. When the straightening rollers rotate, they transport the pipe forward.

3. The heating coil preparation apparatus as described in claim 1, characterized in that: The entrance of the guide channel is provided with a branch pipe pile located on the center line of the guide channel. The branch pipe pile can be raised and lowered in the vertical direction, thereby protruding from the bottom surface of the guide channel or lowering to at least be flush with the bottom surface of the guide channel.

4. The heating coil preparation apparatus as described in claim 1, characterized in that: The turntable is provided with a spiral-shaped coil guide groove, and the tube is located in the coil guide groove.

5. The heating coil preparation apparatus as described in claim 1, characterized in that: The turntable is provided with at least two adsorption grooves extending radially along the turntable. The adsorption grooves are evenly spaced along the circumference of the turntable and are connected to an air pump via an air pipe.

6. The heating coil preparation apparatus as described in claim 1, characterized in that: It also includes a pressure plate that can completely cover the turntable. The lower surface of the pressure plate is provided with a groove that cooperates with the winding column, and the depth of the groove is adjustable.

7. A method for preparing a heating coil using the heating coil preparation apparatus as described in any one of claims 1 to 6, comprising the following steps: The rolled hose material is installed onto the roll mounting roller, and the head of the hose is pulled by the traction cutting mechanism, which pulls the hose forward. The pipe jacking mechanism bends the cut pipes on the conveyor belt and pushes them into the guide groove; Hold the bend in the pipe and guide it along the guide groove to the coiling workbench. Place the bend onto one of the winding columns of the turntable and start the turntable to rotate. The pipe is coiled around the bend as the center and along the winding column to form a heating coil.

8. The method for preparing a heating coil as described in claim 7, characterized in that: It also includes the following steps: The position of the jacking mechanism is set such that the distance from the tail of the cut pipe to the jacking rod is (L-ΔL) / 2. The difference in pipe length ΔL between the inlet and outlet of the heating coil is determined in advance using the following method: After the cut pipe is folded in half from the midpoint, the heating coil is obtained by winding around the folded position. The length difference between the tail ends of the inner and outer layers of the heating coil is taken as the pipe length difference ΔL between the inlet and outlet of the heating coil. The length of the cut pipe is equal to the total length L of the pipe of a heating coil. The traction speed v of the traction pipe cutting mechanism and the time interval t for the pipe cutting operation are set so that the length v×t of the pipe obtained after each cutting action is equal to the total length L of the pipe of a heating coil.

9. The method for preparing a heating coil as described in claim 7 or 8, characterized in that: It also includes the following steps: After the winding is completed, the PVC film is covered on the heating coil, the welding machine is started, and the welding head mold is lowered to press the PVC film. The outlet of the heating coil is clamped, the inlet is connected to a compressed air source, and sufficient air is injected into the pipeline of the heating coil. The welding machine welds the heating coil to the PVC diaphragm. Raise the welding head mold, turn off the suction pump, and remove the welded heating coil to complete the preparation of the heating coil.

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