An apparatus for producing an internally threaded metal pipe

Abstract

This utility model relates to the field of metal pipe processing technology, and in particular to a production equipment for internally threaded metal pipes. The equipment includes an unwinding device, a head-making machine, an internal thread forming machine, a multi-wedge belt drawing machine, and a winding device arranged sequentially. The internal thread forming machine includes a frame and a horizontal straightening machine, a spinning die device, and a cooling and sizing device mounted on the frame. Before forming the internal thread, the end of the metal pipe is processed by the head-making machine to narrow its diameter, thus facilitating subsequent internal thread processing by the spinning die device. After internal thread processing, the metal pipe is cooled and sizing by the cooling and sizing device. Finally, the multi-wedge belt drawing machine draws the internally threaded metal pipe to obtain a metal pipe with uniform wall thickness and excellent mechanical properties.

Description

Technical Field

[0001] This utility model relates to the field of metal pipe processing technology, and in particular to a production equipment for internally threaded metal pipes. Background Technology

[0002] Internally threaded tubes, also known as dry evaporator tubes, internally finned tubes, or internally ribbed tubes, are high-efficiency heat exchange elements used in dry evaporators of central air conditioning systems, and also in refrigeration and air conditioning, heat exchangers, and computer heat sinks. The inner wall of this tube features a spirally rising rectangular groove structure, which maintains a water film on the tube wall by enhancing fluid turbulence and centrifugal force, preventing film boiling and increasing the convective heat transfer coefficient. Its inner surface area is 1.5-2 times that of smooth copper tubes, its heat transfer coefficient is increased to 1.5-2.4 times, and its flow resistance only increases by 3-5%. However, the metal tubes require special treatment before and after the internal thread forming mechanism to ensure that the resulting internally threaded metal tubes are easy to form and meet the required diameter requirements. Therefore, there is a need for an internally threaded metal tube production equipment to process the metal tubes. Utility Model Content

[0003] This utility model solves the problems in related technologies and proposes a production equipment for internally threaded metal tubes. Before the internal thread is formed, the end of the metal tube is processed by a head-making machine to narrow the diameter of the end, so as to facilitate the subsequent internal thread processing by a spinning die device. After the internal thread is processed, the metal tube is cooled and sized by a cooling and sizing device. Finally, it is drawn by a multi-wedge belt drawing machine to obtain an internally threaded metal tube with uniform wall thickness and excellent mechanical properties.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a production equipment for internally threaded metal pipes, comprising an unwinding device, a head-making machine, an internal thread forming machine, a multi-wedge strip drawing machine, and a winding device arranged in sequence. The internal thread forming machine includes a frame and a horizontal straightening machine, a rotary die device, and a cooling and sizing device mounted on the frame.

[0005] As a preferred embodiment, the head-making machine includes a motor, a belt drive assembly, and a head-making mold. The head-making mold is mounted on a rotating shaft via bearings, and the motor drives the rotating shaft via the belt drive assembly to rotate the head-making mold. The head-making mold includes a mold block, impact blocks, and a mold block cover. The inner hole of the mold block is tapered. At least two impact blocks are installed inside the housing and located on the outer periphery of the mold block. Rollers are provided on the outer periphery of the impact blocks. The mold block is pressed by the mold block cover, and the housing is pressed by an end cap.

[0006] As a preferred embodiment, the spinning die device includes a high-speed motor spindle and an internal thread die assembly. The high-speed motor spindle is mounted on a motor die base. The internal thread die assembly includes a pre-reduction die, a reduction die, a spinning die, a mandrel, a first guide die, and a sizing die. The pre-reduction die and the sizing die are located at the beginning and end of the spinning die device, respectively. The reduction die and the spinning die are sleeved on the mandrel. The spinning die includes a spinning ring and a steel ball. A threaded mandrel is provided at the end of the mandrel near the spinning die.

[0007] As a preferred embodiment, the system also includes a worm gear drive mechanism, which includes a meshing worm wheel and a worm. The worm wheel is threadedly connected to the outer cylinder, and an inner cylinder is provided inside the outer cylinder, with a spring provided between the outer cylinder and the inner cylinder.

[0008] As a preferred embodiment, the system also includes a linear guide rail, a motor cover is installed at one end of the high-speed motor spindle, the spinning die is located inside the mold housing and the mold housing is detachably connected to the motor cover, and the mold housing is mounted on the linear guide rail via a bracket and a slider.

[0009] As a preferred embodiment, the cooling and sizing device includes a support and a sizing housing mounted on the support. A sprayer is provided inside the sizing housing, and a first mold base and a second mold base are respectively provided at both ends of the sizing housing. A second guide mold is provided at the end of the second mold base.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: Before the internal thread forming of the metal tube, the end of the metal tube is processed by a head-making machine to narrow its diameter, thereby facilitating the subsequent internal thread processing by the spinning die device. After the internal thread processing, the metal tube is cooled and sized by a cooling and sizing device, and finally drawn by a multi-wedge belt drawing machine to obtain an internally threaded metal tube with uniform wall thickness and excellent mechanical properties. The motor cover and the mold housing are detachably connected by a snap-fit, and the mold housing is slidably mounted on a linear guide rail by a bracket and a slider. When the spinning die is worn, the mold housing is pushed on the linear guide rail manually or electrically to separate the mold housing from the motor cover, thereby facilitating the replacement of the spinning die. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the head-making machine of this utility model; Figure 3 This is a cross-sectional view of the rotary die device of this utility model; Figure 4 This is a structural schematic diagram of the internal thread mold assembly of this utility model; Figure 5This is a schematic diagram of the cooling and sizing device of this utility model; Figure 6 This is a schematic diagram showing the positional relationship between the mold block, the impact block, and the rollers of this utility model.

[0012] In the picture: 1. Unwinding device; 2. Heading machine; 21. Motor; 22. Belt drive assembly; 23. Die block; 24. Rotating shaft; 25. Impact block; 26. Die block cover; 27. Housing; 28. End cover; 29. ​​Roller; 3. Internal thread forming machine; 31. Frame; 32. Unwinding looper; 33. Horizontal straightener; 34. Spinning die assembly; 341. High-speed motor spindle; 3411. Motor sleeve cover; 342. Internal thread die assembly; 3421. Pre-reduction die; 3422. Reduction die; 3423. Spinning die; 3424. 3425. Core rod, 3426. First guide mold, 3427. Sizing mold, 343. Motor mold base, 344. Worm gear drive mechanism, 3441. Worm gear, 3442. Worm, 345. Linear guide rail, 3451. Bracket, 3461. Outer cylinder, 3462. Inner cylinder, 3463. Spring, 35. Cooling sizing device, 351. Support, 352. Sizing housing, 353. Sprayer, 354. First mold base, 355. Second mold base, 356. Second guide mold, 4. Multi-wedge belt drawing machine, 5. Winding device. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0014] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0015] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0016] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0017] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0018] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0019] like Figures 1 to 6 As shown, a production equipment for internally threaded metal tubes includes an unwinding device 1, a head-making machine 2, an internal thread forming machine 3, a multi-wedge strip drawing machine 4, and a winding device 5 arranged sequentially. The internal thread forming machine 3 includes a frame 31 and a horizontal straightener 33, a spinning die device 34, and a cooling and sizing device 35 mounted on the frame 31. The metal tube in the unwinding device 1 first passes through the head-making machine 2 to process the end of the metal tube, making its end diameter slightly narrower. Then it passes through the horizontal straightener 33 for horizontal straightening, and then through the spinning die device. 34. The internal thread is processed. The metal tube after internal thread processing is cooled and sized by the cooling and sizing device 35. Finally, it is drawn by the multi-wedge belt drawing machine 4 to obtain a metal tube with uniform wall thickness and excellent mechanical properties. Finally, it is wound up by the winding device 5. The structure of the multi-wedge belt drawing machine 4 can refer to the published patent CN223276951U. The horizontal straightening machine 33 is also the prior art. The unwinding device 1 and the winding device 5 are both driven by the unwinding or winding motor to rotate the unwinding or winding disc.

[0020] In one embodiment, the head-making machine 2 includes a motor 21, a belt drive assembly 22, and a head-making mold. The head-making mold is mounted on a rotating shaft 24 via bearings, and the motor 21 drives the rotating shaft 24 via the belt drive assembly 22 to rotate the head-making mold. Specifically, the head-making mold includes a mold block 23, impact blocks 25, and a mold block cover 26. The inner hole of the mold block 23 is conical. Four impact blocks 25 are installed inside the housing 27 and located on the outer periphery of the mold block 23. Rollers 29 are provided on the outer periphery of the impact blocks 25. The mold block 23 is pressed by the mold block cover 26, and the housing 27 is pressed by the end cover 28. Specifically, the end cover 28 is hinged to the housing 27 and can be locked to the housing 27 by a latch. Then, the motor 21 causes the rotating shaft 24 to rotate via the belt drive assembly 22. At this time, the impact blocks 25 impact the rollers 29 under the action of centrifugal force, and then rebound to impact the mold.

[0021] In one embodiment, an unwinding looper 32 is also installed at one end of the frame 31 near the head-making machine 2. The structure and working principle of the unwinding looper 32 can be referred to the published patent CN220717262U. It mainly guides the movement direction of the metal tube, facilitates the feeding and movement of the metal tube coil, facilitates the insertion of the metal tube, saves workers' physical strength, and improves production efficiency.

[0022] In one embodiment, the spinning die device 34 includes a high-speed motor spindle 341 and an internal thread die assembly 342. The high-speed motor spindle 341 is mounted on a motor die base 343. The internal thread die assembly 342 includes a pre-reduction die 3421, a reduction die 3422, a spinning die 3423, a core rod 3424, a first guide die 3425, and a sizing die 3426. The pre-reduction die 3421 and the sizing die 3426 are located at the beginning and end of the spinning die device 34, respectively. The reduction die 3422 and the spinning die 3423 are fitted around the core rod 3424. The spinning die 3423 includes a spinning ring and a steel ball. A threaded core head is provided at one end of the core rod 3424 near the spinning die 3423. After the straightened metal tube is reduced in diameter by the pre-reduction die 3421 and the reduction die 3422, it is then spun by the spinning die 3423 to obtain an internal thread, and then sizing is achieved by the sizing die 3426.

[0023] In one embodiment, a worm gear drive mechanism 344 is also included. The worm gear drive mechanism 344 includes a meshing worm gear 3441 and a worm 3442. The worm gear 3441 is threadedly connected to the outer cylinder 3461. An inner cylinder 3462 is provided inside the outer cylinder 3461, and a spring 3463 is provided between the outer cylinder 3461 and the inner cylinder 3462. The worm 3442 is driven by a handwheel or a motor, which in turn causes the worm gear 3441 to rotate, thereby enabling the outer cylinder 3461 to move towards or away from the inner cylinder 3462.

[0024] In one embodiment, a linear guide rail 345 is also included. A motor cover 3411 is installed at one end of the high-speed motor spindle 341. The spinning die 3423 is located inside the die housing, and the die housing and the motor cover 3411 are detachably connected by a snap-fit. The die housing is mounted on the linear guide rail 345 via a bracket 3451 and a slider. When the spinning die 3423 is worn and needs to be replaced, the die housing is pushed manually or electrically to slide on the linear guide rail 345, thereby separating the die housing from the motor cover 3411, thus facilitating the replacement of the spinning die 3423.

[0025] In one embodiment, the cooling and sizing device 35 includes a support 351 and a sizing housing 352 mounted on the support 351. A sprayer 353 is provided inside the sizing housing 352. The sprayer 353 is a cylindrical structure with multiple spray nozzles. Each spray nozzle can be fixed with a spray head. The spray head is connected to a water source to spray and cool the metal pipe. Therefore, an inlet and an outlet need to be reserved on the sizing housing 352. A first mold base 354 and a second mold base 355 are respectively provided at both ends of the sizing housing 352. A second guide mold 356 is provided at the end of the second mold base 355. The second guide mold 356 sizing the metal pipe.

[0026] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A production equipment for internally threaded metal pipes, characterized in that: The assembly includes, in sequence, an unwinding device (1), a head-making machine (2), an internal thread forming machine (3), a multi-wedge belt drawing machine (4), and a winding device (5). The internal thread forming machine (3) includes a frame (31) and a horizontal straightening machine (33), a spinning die device (34), and a cooling and sizing device (35) mounted on the frame (31). The head-making machine (2) includes a motor (21), a belt drive assembly (22), and a head-making die. The head-making die is mounted on a rotating shaft (24) via bearings, and the motor (21) is driven by a belt drive assembly (22). The belt drive assembly (22) drives the rotating shaft (24) to rotate the head mold. The head mold includes a mold block (23), a striking block (25) and a mold block cover (26). The inner hole of the mold block (23) is conical. At least two striking blocks (25) are installed in the housing (27) and located on the outer periphery of the mold block (23). Rollers (29) are provided on the outer periphery of the striking blocks (25). The mold block (23) is pressed by the mold block cover (26) and the housing (27) is pressed by the end cover (28).

2. The internally threaded metal tube production equipment according to claim 1, characterized in that: The spinning device (34) includes a high-speed motor spindle (341) and an internal thread mold assembly (342). The high-speed motor spindle (341) is mounted on a motor mold base (343). The internal thread mold assembly (342) includes a pre-reduction mold (3421), a reduction mold (3422), a spinning mold (3423), a core rod (3424), a first guide mold (3425), and a sizing mold (3426). The pre-reduction mold (3421) and the sizing mold (3426) are located at the beginning and end of the spinning device (34), respectively. The reduction mold (3422) and the spinning mold (3423) are fitted around the core rod (3424). The spinning mold (3423) includes a spinning ring and a steel ball. A threaded core head is provided at the end of the core rod (3424) near the spinning mold (3423).

3. The internally threaded metal tube production equipment according to claim 2, characterized in that: It also includes a worm gear drive mechanism (344), which includes a meshing worm gear (3441) and a worm (3442). The worm gear (3441) is threadedly connected to the outer cylinder (3461). An inner cylinder (3462) is provided inside the outer cylinder (3461), and a spring (3463) is provided between the outer cylinder (3461) and the inner cylinder (3462).

4. The internally threaded metal tube production equipment according to claim 2, characterized in that: It also includes a linear guide rail (345), one end of the high-speed motor spindle (341) is equipped with a motor cover (3411), the spinning die (3423) is located inside the die housing and the die housing is detachably connected to the motor cover (3411), and the die housing is mounted on the linear guide rail (345) by a bracket (3451) and a slider.

5. The internally threaded metal tube production equipment according to claim 1, characterized in that: The cooling sizing device (35) includes a support (351) and a sizing housing (352) mounted on the support (351). A sprayer (353) is provided inside the sizing housing (352), and a first mold base (354) and a second mold base (355) are respectively provided at both ends of the sizing housing (352). A second guide mold (356) is provided at the end of the second mold base (355).

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