Tube passing assist device, tube passing device and tube passing method

Abstract

The application relates to the technical field of pipe processing, in particular to a pipe penetrating auxiliary device, a pipe penetrating device and a pipe penetrating method, the pipe penetrating auxiliary device is used for assisting a pipe to be sleeved on a core rod, and comprises a supporting member which defines an imaginary straight line extending along a sleeving direction of the pipe; a first clamping mechanism is installed to the supporting member and is configured to elastically clamp a pipe head of the pipe in such a way that a central axis of the pipe head coincides with the imaginary straight line and allows the pipe head to move along the sleeving direction while the central axis of the pipe head keeps coinciding with the imaginary straight line; a second clamping mechanism is installed to the supporting member and is located on a downstream side of the first clamping mechanism in the sleeving direction and is configured to clamp a rod head of the core rod in such a way that a central axis of the rod head coincides with the imaginary straight line.

Description

Technical Field

[0001] This application relates to the field of pipe processing technology, and in particular to a pipe threading auxiliary device, a pipe threading device, and a pipe threading method. Background Technology

[0002] In nuclear power units, the Moisture Separator Reheater (MSR) is an indispensable key piece of equipment. The interior of the MSR contains numerous high-efficiency heat exchange tubes, each of which typically requires external fins and internal reinforced threads (or internal fins) to be machined onto its wall. In some applications, where the heat exchange tubes in the MSR can reach nearly 40 meters in length, it is necessary to pre-insert the tube blank onto a long mandrel when machining the external or internal fins. This mandrel is placed inside the tube blank, providing support for the machining of the external or internal fins.

[0003] Inserting the tube blank into the core rod is the first step in processing the heat exchange tube. Since the gap between the inner circumferential surface of the tube blank and the outer circumferential surface of the core rod is small, the key challenge in inserting the tube blank and the core rod is how to achieve a precise and rapid connection between the tube head and the rod head. This is also the first step in inserting the tube. Summary of the Invention

[0004] In view of this, this application proposes a tube-threading auxiliary device, a tube-threading device, and a tube-threading method.

[0005] In a first aspect, a tube-threading auxiliary device is provided for assisting the tube in threading onto the core rod, comprising: A support member that defines an imaginary straight line extending along the sleeve direction of the tube; A first clamping mechanism is mounted to the support member and configured to elastically clamp the tube head in such a way that the central axis of the tube head coincides with the imaginary straight line, and allows the tube head to move along the sleeve direction while its axis remains coincident with the imaginary straight line. A second clamping mechanism, which is mounted to the support member and located downstream of the first clamping mechanism in the sleeve direction, is configured to clamp the rod head of the core rod in such a way that the central axis of the rod head coincides with the imaginary straight line.

[0006] In some possible implementations, the first clamping mechanism includes: A first clamping block and a second clamping block are configured to move symmetrically with respect to an imaginary plane and have a relatively close approach state and a relatively far away state; in the close approach state, a first flared opening is formed between the first clamping block and the second clamping block for the tube head to enter; wherein the imaginary straight line extends in the imaginary plane; A first biasing member elastically biases the first clamp and the second clamp toward the proximity state; When the first clamp and the second clamp are in the close proximity state, in response to the tube head entering the first flared opening along the sleeve direction, the first clamp and the second clamp are pushed, and the first clamp and the second clamp overcome the elastic bias force of the first bias member and move symmetrically away from the imaginary plane, thereby causing the tube head to be elastically clamped by the first clamp and the second clamp.

[0007] In some possible implementations, the first clamping block has a first clamping surface and the second clamping block has a second clamping surface, the first clamping surface and the second clamping surface clamping the tube head from both radial sides, and the first clamping surface and the second clamping surface are formed as concave surfaces symmetrical about the imaginary line.

[0008] In some possible implementations, the first clamping mechanism includes: A first power element is configured to keep the first clamping block and the second clamping block in the said far-away state; When the first clamp and the second clamp are in the distanced state, the first clamp and the second clamp release the tube.

[0009] In some possible implementations, the first biasing member includes: A first spring applies a first elastic force toward the second clamping block to the first clamping block; The second spring applies a second elastic force toward the first clamping block to the second clamping block; A first adjusting screw is connected to the first spring and can be operated to adjust the magnitude of the first spring force; The second adjusting screw is connected to the second spring and can be operated to adjust the magnitude of the second spring force.

[0010] In some possible implementations, the rod head includes a distal portion facing the first clamping mechanism and a non-terminal portion continuous with the distal portion, and the second clamping mechanism includes: A third and a fourth clamping block are configured to move symmetrically with respect to an imaginary plane and have a clamping state that is relatively close to each other and a releasing state that is relatively far apart. In the clamping state, the third and fourth clamping blocks clamp the non-terminal portion from radial sides respectively, and a second flared opening is formed between the third and fourth clamping blocks, facing the first clamping mechanism, for the tube head to enter. The terminal portion is located within the second flared opening. In the releasing state, the third and fourth clamping blocks release the core rod, and a channel is formed between them for the tube to pass through. The second power component is configured to hold the third and fourth clamping blocks in the released state.

[0011] In some possible implementations, the second clamping mechanism includes: The second biasing member elastically biases the third and fourth clamping blocks toward the clamping state.

[0012] Secondly, a tube-insertion device is proposed, comprising: The tube-piercing auxiliary device as described in the first aspect; A tube support body that supports the tube to be sleeved on the upstream side of the first clamping mechanism along the sleeved direction; A core rod support body that supports the core rod on the downstream side of the second clamping mechanism along the sleeve direction; A tube feeding mechanism that drives the tube to move along the sleeve direction.

[0013] Thirdly, a tube-passing method is proposed, which is performed using the tube-passing auxiliary device as described in the first aspect, the method comprising: The tube head and the rod head are aligned by elastically clamping the tube head with the first clamping mechanism and clamping the rod head with the second clamping mechanism. The tube is moved along the sleeve direction to allow the tube head to be sleeved on the rod head; The first clamping mechanism is controlled to release the tube head to form a first channel for the tube to pass through at the first clamping mechanism, and the second clamping mechanism is controlled to release the rod head to form a second channel for the tube to pass through at the second clamping mechanism; The tube is moved sequentially through the first channel and the second channel along the sleeve direction.

[0014] According to the tube insertion auxiliary device provided in this application, the tube head and rod head can be quickly and accurately connected, which helps to quickly insert the tube to be processed onto the support rod, thereby improving the production efficiency of heat exchange tubes. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0016] Figure 1 This is a schematic diagram of the tube-piercing auxiliary device provided in one embodiment of this application.

[0017] Figure 2 yes Figure 1 A partial structural diagram.

[0018] Figure 3 yes Figure 1 The diagram shows the structure of the tube-threading auxiliary device applied to the tube-threading device.

[0019] Figure 4 yes Figure 3 A sectional view along the AA direction.

[0020] Figure 5 yes Figure 3 BB-direction sectional view.

[0021] Figure 6 yes Figure 3 A bottom view of a portion of the image.

[0022] Figure 7 yes Figure 1 A schematic diagram of the structure of the third clamping block.

[0023] Figure 8 This is a schematic flowchart of a tube-threading method provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: VF - Imaginary plane, DR1 - Sleeve direction, DR2 - Clamping direction, AX - Imaginary straight line, AX1 - First axis, AX2 - Second axis; TT - tube, TT1 - tube head; PP - Core shaft, PP1 - Club head, PP11 - Tip section, PP12 - Non-tip section; 100-Pipe insertion auxiliary device, 200-Pipe delivery mechanism, 300-Pipe support body, 400-Rod support body, 500-Rod delivery mechanism; 1-First clamping block, 1a-First clamping surface, 2-Second clamping block, 2a-Second clamping surface, 3-Third clamping block, 3a-Third clamping surface; 4-Fourth clamping block, 4a-Fourth clamping surface; 5-First movable hinge block, 5a-First elongated hole, 5b-Second elongated hole; 6-Second movable hinge block, 6a-Third elongated hole, 6b-Fourth elongated hole; 7 - First spring, 8 - Second spring, 9 - Third spring, 10 - Fourth spring; 11-First stop, 12-Second stop; 13-First adjusting screw, 14-Second adjusting screw, 15-Third adjusting screw, 16-Fourth adjusting screw; 17-First lead screw seat, 17a-First sliding cavity; 18-Second lead screw seat, 18a-Second sliding cavity; 19 - First push rod, 20 - Second push rod; 21 - First shell, 22 - Second shell; 23 - First power component, 24 - Second power component; 25-First clamping roller, 26-Second clamping roller, 27-Guide sleeve, 28-Sensor; 29-First connecting shaft, 30-Second connecting shaft, 31-Motor; 32-Third lead screw seat, 32a-Third sliding cavity; 33-Fourth lead screw seat, 33a-Fourth sliding cavity; 34 - Third connecting shaft, 35 - Fourth connecting shaft; 36 - Third push rod, 37 - Fourth push rod; 38 - First horn opening, 39 - Second horn opening, 40 - Third horn opening. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0026] In the description of this application, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects, and, for example, the term "first element" itself does not imply the existence of a "second element," nor does the term "second element" itself imply the existence of a "first element." Furthermore, words such as "a" or "one" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates not less than two.

[0027] In the description of this application, the terms "comprising" or "having" indicate the presence of the said features, numbers, operations, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, and / or combinations thereof.

[0028] In the description of this application, references to "one embodiment" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0029] Figures 1 to 7 This application illustrates a tube insertion auxiliary device 100 provided in one embodiment, which is used to assist the tube TT in being inserted into the core rod PP, so that the finning machine at the rear end can process fins on the tube wall of the tube TT with the support of the core rod PP, thereby obtaining a heat exchange tube TT with high heat exchange efficiency.

[0030] The tube insertion auxiliary device 100 includes a support member and a first clamping mechanism and a second clamping mechanism mounted on the support member. The first clamping mechanism and the second clamping mechanism are arranged sequentially along the tube insertion direction DR1 of the tube TT, that is, in the tube insertion direction DR1 of the tube TT, the second clamping mechanism is located downstream of the first clamping mechanism.

[0031] The supporting member includes a first housing 21 with a generally rectangular parallelepiped shape. The first housing 21 has an upwardly opening body portion and a cover portion that is detachably fastened to the opening by bolts. Furthermore, the first housing 21 defines a vertical imaginary plane VF and an imaginary straight line AX extending within the imaginary plane VF along the through-hole direction DR1; that is, the imaginary plane VF and the imaginary straight line AX have a fixed positional relationship with the first housing 21. Additionally, the imaginary plane VF is perpendicular to the cover portion of the first housing 21, and the imaginary straight line AX is parallel to the cover portion of the first housing 21.

[0032] The first clamping mechanism can elastically clamp the tube head TT1 of tube TT in such a way (for ease of explanation, it is referred to as mode one) that the central axis of tube head TT1 coincides with the imaginary straight line AX, and allows tube head TT1 to move along the sleeve direction DR1 while its central axis coincides with the imaginary straight line AX.

[0033] The second clamping mechanism can releasably clamp the head PP1 of the core rod PP in such a way (for ease of explanation, this will be referred to as mode two) that the central axis of the head PP1 coincides with the imaginary straight line AX.

[0034] Therefore, when the first clamping mechanism clamps the tube head TT1 in the manner described above, and the second clamping mechanism clamps the rod head PP1 in the manner described above, the tube head TT1 and the rod head PP1 are aligned in the insertion direction DR1. Furthermore, when a relevant component (such as the tube feeding mechanism 200 described later) applies a reasonably large force to the tube TT in the insertion direction DR1, the first clamping mechanism guides the tube head TT1 to move toward the rod head PP1 while maintaining alignment with the rod head PP1, thereby allowing the tube head TT1 to be inserted onto the rod head PP1.

[0035] In this embodiment, the pipe head TT1 of the pipe TT is elastically rather than rigidly clamped by the first clamping mechanism to straighten the position of the pipe head TT1. This has the following advantages: on the one hand, it is easy to clamp and position pipes TT of various diameters (outer diameters) to the same reference position, that is, it can be very easy to adapt to pipes TT of various diameters; on the other hand, even if the pipe head TT1 is in the clamped state, because the clamping mechanism has a certain elastic floating space, when a properly large force is applied to the pipe TT along the sleeve direction DR1, the pipe head TT1 can move toward the rod head PP1 while maintaining the elastic clamping state of the first clamping mechanism (thus ensuring that the pipe head TT1 is always aligned with the rod head PP1), so that it can be smoothly sleeved on the rod head PP1.

[0036] In detail, the first clamping mechanism includes a first clamping block 1, a second clamping block 2, a first transmission assembly, a first biasing member, and a first power member 23. The first clamping block 1, the second clamping block 2, and the first biasing member are all disposed on the upper exterior of the first housing 21, and the first power member 23 is disposed inside the first housing 21.

[0037] Each of the first clamping block 1 and the second clamping block 2 is capable of relative movement with respect to the first housing 21 in a clamping direction DR2 perpendicular to the aforementioned imaginary plane VF. More specifically, the first clamping block 1 and the second clamping block 2 are connected to each other via a first transmission assembly. Under the constraint of the first transmission assembly, the first clamping block 1 and the second clamping block 2 move symmetrically (centeredly) with respect to the aforementioned imaginary plane VF. That is, when the first clamping block 1 moves away from the imaginary plane VF, under the constraint of the first transmission assembly, the second clamping block 2 moves away from the imaginary plane VF at the same speed on the other side of the imaginary plane VF; when the second clamping block 2 moves closer to the imaginary plane VF, under the constraint of the first transmission assembly, the first clamping block 1 moves closer to the imaginary plane VF at the same speed on the other side of the imaginary plane VF.

[0038] Based on the relative movement of the first clamping block 1 and the second clamping block 2 in the clamping direction DR2, the first clamping block 1 and the second clamping block 2 selectively have a close state and a far state, and when the first clamping block 1 and the second clamping block 2 are in the close state, a first flared opening 38 is formed between them for the tube head TT1 to enter. The first flared opening 38 is located at the upstream end of the first clamping block 1 and the second clamping block 2 in the insertion direction DR1.

[0039] The first biasing member includes a first spring 7 and a second spring 8, wherein the first spring 7 applies a spring force to the first clamping block 1 toward the second clamping block 2, and the second spring 8 applies a spring force to the second clamping block 2 toward the first clamping block 1. Thus, the first clamping block 1 and the second clamping block 2 tend to move closer to each other under the force applied by the first spring 7 and the second spring 8, thereby elastically biasing the first clamping block 1 and the second clamping block 2 toward a close-to-close state.

[0040] In practice, when the first clamping block 1 and the second clamping block 2 are close together, the tube TT to be sleeved from the upstream side (e.g., the clamping roller pair described later) first enters the first flared opening 38 between the first clamping block 1 and the second clamping block 2 along the sleeved direction DR1. When the tube head TT1 contacts the first clamping block 1 and the second clamping block 2 and continues to move, the first clamping block 1 and the second clamping block 2, due to the force of the tube head TT1, overcome the elastic force of the first spring 7 and the second spring 8 respectively and move symmetrically away from the imaginary plane VF. That is, the forward-moving tube head TT1 symmetrically pushes the first clamping block 1 and the second clamping block 2 away along the clamping direction DR2, thereby providing clearance space for the continued movement of the tube head TT1. Furthermore, during the period when the tube head TT1 pushes away the first clamp 1 and the second clamp 2 and continues to move forward, since the elastic biasing force applied by the first biasing member to the first clamp 1 and the second clamp 2 still exists, the tube head TT1 is in a state of being elastically clamped by the first clamp 1 and the second clamp 2 (at this time, the first clamp 1 and the second clamp 2 can be understood as being in an intermediate state between the aforementioned approaching state and the away state). Under the action of this elastic clamping force, the tube head TT1, which may have been misaligned, is straightened by the centering movement of the first clamp 1 and the second clamp 2, so that the central axis of the tube head TT1 coincides with the imaginary straight line AX. In this way, the tube head TT1 moves towards the rod head PP1 while maintaining the state of being elastically clamped by the first clamp 1 and the second clamp 2.

[0041] The tube TT to be threaded from the upstream side (e.g., the clamping roller pair described later) has a positional accuracy of its tube head TT1 that is difficult to guarantee. It usually appears randomly within a certain position range. If the first clamping mechanism is omitted and the tube TT is directly pushed (e.g., pushed by the tube feeding mechanism 200 described later) forward, thereby moving its tube TT opening forward, it is very likely that the tube TT opening will not be correctly aligned with the rod head PP1, resulting in tube threading failure. Advantageously, in this embodiment, an outwardly flared first flared opening 38 is formed between the first clamping block 1 and the second clamping block 2 in a close-to-close state. The first flared opening 38 can easily receive the front end of the forward-moving tube head TT1 (even if the tube head TT1 may have a large position range), and after receiving the tube head TT1, the inner wall surface of the flared opening helps to guide the tube head TT1 to the straightening position between the first clamping block 1 and the second clamping block 2.

[0042] The inner wall surface of the first flared opening 38, the second flared opening 39, and the third flared opening 40, described later, can be a smooth conical surface.

[0043] The first clamping block 1 has a first clamping surface 1a and the second clamping block 2 has a second clamping surface 2a. The first clamping surface 1a and the second clamping surface 2a clamp the tube head TT1 from both radial sides (which are also the two sides of the imaginary plane VF), and both the first clamping surface 1a and the second clamping surface 2a are formed as concave surfaces. The shapes of these two concave surfaces are centrally symmetrical about the aforementioned imaginary line.

[0044] The first clamping surface 1a and the second clamping surface 2a can be concave arc surfaces that are symmetrical with respect to an imaginary parallel, such as concave circular arc surfaces or concave elliptical arc surfaces, wherein the elliptical arc surface is preferably an elliptical arc surface on the radial side of the major axis of an ellipse (e.g., Figure 4 Thus, when the pipe head TT1 enters between the first clamping surface 1a and the second clamping surface 2a, under the elastic biasing force applied by the first biasing member, based on the shape fit between the outer surface of the pipe head TT1 (especially when the pipe TT is circular) and the two concave clamping surfaces, the pipe head TT1 will automatically move to a position where the two ends of one diameter of the pipe head TT1 are respectively at the deepest point of the first clamping surface 1a and the deepest point of the second clamping surface 2a. In this way, pipe heads TT1 of various diameters can be easily positioned to the aforementioned position—a position where the central axis of the pipe head TT1 coincides with the imaginary straight line AX. Furthermore, since the first clamping block 1 and the second clamping block 2 are always symmetrical with respect to the imaginary plane VF, the first clamping surface 1a and the second clamping surface 2a always maintain a centrally symmetrical shape relationship about the imaginary straight line AX. When the pipe head TT1, clamped by the first clamping block 1 and the second clamping block 2, moves forward, the central axis of the pipe head TT1 can still be well maintained on the imaginary straight line AX.

[0045] The first power component 23 is specifically a cylinder, which is selectively connected to the first clamping block 1 and the second clamping block 2 via a first transmission assembly, and is configured to keep the first clamping block 1 and the second clamping block 2 in the aforementioned far-away state. In this embodiment, the first power component 23 can drive the first clamping block 1 and the second clamping block 2 to move away from each other via the first transmission assembly, and can keep the first clamping block 1 and the second clamping block 2 in the far-away state, but cannot drive the first clamping block 1 and the second clamping block 2 to move closer to each other. The closer movement of the first clamping block 1 and the second clamping block 2 is performed by the force applied by the aforementioned first biasing member.

[0046] Furthermore, when the first clamping block 1 and the second clamping block 2 are in the aforementioned distanced state, the first clamping block 1 and the second clamping block 2 release the tube TT, that is, the first clamping block 1 and the second clamping block 2 no longer apply elastic clamping force to the tube TT. Thus, even after the tube head TT1 has been threaded onto the rod head PP1 and the connection between the tube TT and the core rod PP has been completed, the first clamping block 1 and the second clamping block 2 can be in a distanced state to reduce the resistance encountered by the tube TT during the continued threading process.

[0047] Additionally, the first biasing component also includes a first adjusting screw 13 and a second adjusting screw 14 with handwheels. The first adjusting screw 13 and the second adjusting screw 14 are respectively connected to the first spring 7 and the second spring 8. In practice, the operator can rotate the first adjusting screw 13 and the second adjusting screw 14 to change their positions relative to the first housing 21 and the imaginary plane VF, thereby adjusting the initial compression of the first spring 7 and the second spring 8, and thus adjusting the elastic force applied by the first spring 7 to the first clamping block 1 and the elastic force applied by the second spring 8 to the second clamping block 2. For example, when the diameter of the tube TT to be sleeved is small, the initial elastic force of the first spring 7 and the second spring 8 is increased, while when the diameter of the tube TT to be sleeved is large, the initial elastic force of the first spring 7 and the second spring 8 is decreased, so that the first clamping block 1 and the second clamping block 2 always clamp tubes TT of different diameters with substantially the same clamping force.

[0048] In detail, a first lead screw seat 17 and a second lead screw seat 18 are fixed to the cover plate of the first housing 21. The first lead screw seat 17 has a first sliding cavity 17a opening towards the first clamping block 1, and the second lead screw seat 18 has a second sliding cavity 18a opening towards the second clamping block 2. A first adjusting lead screw 13 and a second adjusting lead screw 14 are respectively screwed into the first lead screw seat 17 and the second lead screw seat 18, and respectively extend into the first sliding cavity 17a and the second sliding cavity 18a. A first push rod 19 is slidably inserted into the first sliding cavity 17a, and one end of the first push rod 19 protrudes from the opening of the first sliding cavity 17a and is detachably fixed to the first clamping block 1. A first spring 7 abuts against the first adjusting lead screw 13 and the first push rod 19 in a compressed state within the first sliding cavity 17a. A second push rod 20 is slidably inserted into the second sliding cavity 18a, and one end of the second push rod 20 protrudes from the opening of the second sliding cavity 18a and is detachably fixed to the second clamping block 2. The second spring 8 is compressed within the second sliding cavity 18a and abuts against the fourth adjusting screw 16 and the second push rod 20.

[0049] Please see Figure 7 The aforementioned rod head PP1 of the core rod PP includes a terminal portion PP11 facing the first clamping mechanism and a non-terminal portion PP12 continuous with the terminal portion PP11. The terminal portion PP11 defines the axial end face of the core rod PP.

[0050] Similar to the first clamping mechanism, the second clamping mechanism is configured to clamp the rod head PP1 elastically rather than rigidly, and the second clamping mechanism includes a third clamping block 3, a fourth clamping block 4, a second transmission assembly, a second biasing member, and a second power member 24. The third clamping block 3, the fourth clamping block 4, and the second biasing member are all disposed on the upper exterior of the first housing 21, while the second power member 24 is disposed inside the first housing 21.

[0051] Each of the third clamping block 3 and the fourth clamping block 4 is capable of relative movement with respect to the first housing 21 in a clamping direction DR2 perpendicular to the aforementioned imaginary plane VF. More specifically, the third clamping block 3 and the fourth clamping block 4 are connected to each other via a second transmission assembly. Under the constraint of the second transmission assembly, the third clamping block 3 and the fourth clamping block 4 move symmetrically (centeredly) with respect to the aforementioned imaginary plane VF. That is, when the third clamping block 3 moves away from the imaginary plane VF, under the constraint of the second transmission assembly, the fourth clamping block 4 moves away from the imaginary plane VF at the same speed on the other side of the imaginary plane VF; when the fourth clamping block 4 moves closer to the imaginary plane VF, under the constraint of the second transmission assembly, the third clamping block 3 moves closer to the imaginary plane VF at the same speed on the other side of the imaginary plane VF.

[0052] Based on the relative movement of the third clamping block 3 and the fourth clamping block 4 in the clamping direction DR2, the third clamping block 3 and the fourth clamping block 4 can selectively have a clamping state that is relatively close and a releasing state that is relatively far apart. It should be understood that "relatively close" in the clamping state is relative to the releasing state. When the third clamping block 3 and the fourth clamping block 4 are in the aforementioned clamping state, a second flared opening 39 for the tube head TT1 to enter is formed between the third clamping block 3 and the fourth clamping block 4. The third clamping block 3 and the fourth clamping block 4 respectively clamp the non-terminal portion PP12 (not the terminal portion PP11) of the rod head PP1 from both radial sides, while the terminal portion PP11 of the rod head PP1 extends into the second flared opening 39. The second flared opening 39 is located upstream of the third clamping block 3 and the fourth clamping block 4 in the insertion direction DR1. When the third clamping block 3 and the fourth clamping block 4 are in the aforementioned releasing state, the third clamping block 3 and the fourth clamping block 4 release the core rod PP, and a channel for the tube TT to pass through is formed between them.

[0053] The second biasing member includes a third spring 9 and a fourth spring 10. The third spring 9 applies a spring force to the third clamping block 3 toward the fourth clamping block 4, and the fourth spring 10 applies a spring force to the fourth clamping block 4 toward the third clamping block 3. Thus, under the forces applied by the third spring 9 and the fourth spring 10, the third clamping block 3 and the fourth clamping block 4 tend to move closer to each other. In this way, the second biasing member elastically biases the third clamping block 3 and the fourth clamping block 4 toward the aforementioned clamping state. It should be understood that the statement that the second biasing member "elastically biases the third clamping block 3 and the fourth clamping block 4 toward the clamping state" is relative to the released state; and relative to the clamping state, the second biasing member further elastically biases the third clamping block 3 and the fourth clamping block 4 toward the second initial state described later.

[0054] The third clamping block 3 has a third clamping surface 3a and the fourth clamping block 4 has a fourth clamping surface 4a. The third clamping surface 3a and the fourth clamping surface 4a clamp the rod head PP1 from both radial sides (which are also the two sides of the imaginary plane VF), and both the third clamping surface 3a and the fourth clamping surface 4a are formed as concave surfaces. The shapes of these two concave surfaces are centrally symmetrical about the aforementioned imaginary straight line VX.

[0055] The third clamping surface 3a and the fourth clamping surface 4a can be symmetrical concave arc surfaces, such as concave circular arc surfaces or concave elliptical arc surfaces. Thus, when the shaft head TT1 is inserted between the third clamping surface 3a and the fourth clamping surface 4a, under the elastic biasing force applied by the second biasing member, based on the shape fit between the outer surface of the shaft head PP1 (especially when the core rod PP is round) and the two concave clamping surfaces, the shaft head PP1 will automatically move to a position where the two ends of one diameter of the shaft head PP1 are respectively at the deepest points of the third clamping surface 3a and the fourth clamping surface 4a. Furthermore, in this way, shaft heads PP1 of various diameters can be easily positioned to the aforementioned position—a position where the central axis of the shaft head PP1 coincides with the imaginary straight line AX.

[0056] The third clamping surface 3a and the fourth clamping surface 4a can be concave arc surfaces that are symmetrical with respect to an imaginary parallel, such as concave circular arc surfaces or concave elliptical arc surfaces, wherein the elliptical arc surface is preferably an elliptical arc surface on the radial side of the major axis of an ellipse (e.g., Figure 5 Thus, when the shaft head TT1 enters between the third clamping surface 3a and the fourth clamping surface 4a, under the elastic biasing force applied by the second biasing member, based on the shape fit between the outer surface of the shaft head PP1 (especially when the shaft head PP1 is cylindrical) and the two concave clamping surfaces, the shaft head PP1 will automatically move to a position where the two ends of one diameter of the shaft head PP1 are respectively at the deepest point of the third clamping surface 3a and the deepest point of the fourth clamping surface 4a. Furthermore, in this way, shaft heads PP1 of various diameters can be easily positioned to the aforementioned position—a position where the central axis of the shaft head PP1 coincides with the imaginary straight line AX.

[0057] The second power component 24 is specifically a cylinder, which is selectively connected to the third clamping block 3 and the fourth clamping block 4 via the second transmission assembly, and is configured to keep the third clamping block 3 and the fourth clamping block 4 in the aforementioned released state. In this embodiment, the second power component 24 can drive the third clamping block 3 and the fourth clamping block 4 to move away from each other via the second transmission assembly, and can keep the third clamping block 3 and the fourth clamping block 4 in the released state, but cannot drive the third clamping block 3 and the fourth clamping block 4 to move closer to each other; the closer movement of the third clamping block 3 and the fourth clamping block 4 is performed by the force applied by the aforementioned second biasing member.

[0058] As mentioned above, when the third clamping block 3 and the fourth clamping block 4 are in the released state, they release the core rod PP, forming a channel between them for the tube TT to pass through—the third clamping block 3 and the fourth clamping block 4 do not apply an elastic clamping force to the tube TT. Therefore, even when the tube TT opening has already been threaded onto the rod head PP1, the second power member 24 can release the third clamping block 3 and the fourth clamping block 4, reducing the resistance encountered by the tube TT during the continued threading process.

[0059] Additionally, the second biasing component includes a third adjusting screw 15 and a fourth adjusting screw 16 with handwheels. The third adjusting screw 15 and the fourth adjusting screw 16 are connected to the third spring 9 and the fourth spring 10, respectively. In practice, the operator can rotate the third adjusting screw 15 and the fourth adjusting screw 16 to change their positions relative to the first housing 21 and the imaginary plane VF, thereby adjusting the initial compression of the third spring 9 and the fourth spring 10. This, in turn, adjusts the elastic force applied by the third spring 9 to the third clamping block 3 and the elastic force applied by the fourth spring 10 to the fourth clamping block 4. For example, when the diameter of the core rod PP is small, the initial elastic force of the third spring 9 and the fourth spring 10 is increased; conversely, when the diameter is large, the initial elastic force of the third spring 9 and the fourth spring 10 is decreased. This ensures that the third clamping block 3 and the fourth clamping block 4 always clamp core rods PP of different diameters with substantially the same clamping force.

[0060] In detail, a third lead screw seat 32 and a fourth lead screw seat 33 are fixed to the cover plate of the first housing 21. The third lead screw seat 32 has a third sliding cavity 32a opening toward the third clamping block 3, and the fourth lead screw seat 33 has a fourth sliding cavity 33a opening toward the fourth clamping block 4. The third adjusting lead screw 15 and the fourth adjusting lead screw 16 are screwed into the third lead screw seat 32 and the fourth lead screw seat 33, respectively, and extend into the third sliding cavity 32a and the fourth sliding cavity 33a, respectively. The third push rod 36 is slidably inserted into the third sliding cavity 32a, and one end of the third push rod 36 extends out of the opening of the third sliding cavity 32a and is detachably fixed to the third clamping block 3. The third spring 9 abuts against the third adjusting lead screw 15 and the third push rod 36 in a compressed state within the third sliding cavity. The fourth push rod 37 is slidably inserted into the fourth sliding cavity 33a, and one end of the fourth push rod 37 extends out of the opening of the fourth sliding cavity 33a and is detachably fixed to the fourth clamping block 4. The fourth spring 10 is compressed within the fourth sliding cavity 33a and abuts against the fourth adjusting screw 16 and the fourth push rod 37.

[0061] The aforementioned first transmission assembly includes a first movable hinge block 5, a first connecting shaft 29, and a second connecting shaft 30. The first movable hinge block 5 is mounted inside the first housing 21 in a manner rotatable about a first axis AX1, and has a first elongated hole 5a and a second elongated hole 5b (or first guide hole and second guide hole) formed thereon, which are centrally symmetrical about the aforementioned first axis AX1. The upper end of the first connecting shaft 29 is fixed to the first clamping block 1, and the lower end is movably inserted into the first elongated hole 5a. The upper end of the second connecting shaft 30 is fixed to the second clamping block 2, and the lower end is movably inserted into the second elongated hole 5b. Furthermore, the first movable hinge block 5 has a downwardly extending first stop 11, and the cylinder of the first power member 23 has a cylinder shaft that moves toward and away from the first stop 11. Thus, when the cylinder shaft of the first power member 23... Figure 6 When the first movable hinge block 5 extends outward (i.e., to the left) via the first stop block 11, it rotates clockwise around the first axis AX1. Guided by the first elongated hole 5a and the second elongated hole 5b (in addition, the first clamping block 1 and the second clamping block 2 are limited by the aforementioned first push rod 19 and the second push rod 20, respectively, and can only move in a direction perpendicular to the imaginary plane VF), the first connecting shaft 29 and the second connecting shaft 30 move symmetrically away from each other relative to the imaginary plane VF, thereby causing the first clamping block 1 and the second clamping block 2 to move symmetrically away from each other relative to the imaginary plane VF, thus switching the first clamping block 1 and the second clamping block 2 to the aforementioned away state. After this, if the cylinder shaft of the first power member 23 retracts, under the force of the first spring 7 and the second spring 8 and the constraint of the first transmission assembly, the first clamping block 1 and the second clamping block 2 move symmetrically closer to each other relative to the imaginary plane VF.

[0062] Similar to the first transmission assembly, the aforementioned second transmission assembly includes a second movable hinge block 6, a third connecting shaft 34, and a fourth connecting shaft 35. The second movable hinge block 6 is mounted inside the first housing 21 in a manner rotatable about the second axis AX2, and has a third elongated hole 6a and a fourth elongated hole 6b (or third guide hole and fourth guide hole) formed thereon, which are centrally symmetrical about the aforementioned second axis AX2. The upper end of the third connecting shaft 34 is fixed to the third clamping block 3, and the lower end is movably inserted into the third elongated hole 6a. The upper end of the fourth connecting shaft 35 is fixed to the fourth clamping block 4, and the lower end is movably inserted into the fourth elongated hole 6b. Furthermore, the second movable hinge block 6 has a downwardly extending second stop 12, and the cylinder of the second power member 24 has a cylinder shaft that moves toward and away from the second stop 12. Thus, when the cylinder shaft of the second power member 24... Figure 6When the cylinder extends outward (i.e., to the left), the second movable hinge block 6 is pushed by the second stop block 12 to rotate clockwise around the second axis AX2. Guided by the third elongated hole 6a and the fourth elongated hole 6b (in addition, the third clamping block 3 and the fourth clamping block 4 are limited by the aforementioned third push rod 36 and the fourth push rod 37, respectively, and can only move in a direction perpendicular to the imaginary plane VF), the third connecting shaft 34 and the fourth connecting shaft 35 move away from each other symmetrically relative to the imaginary plane VF, thereby causing the third clamping block 3 and the fourth clamping block 4 to move away from each other symmetrically relative to the imaginary plane VF, thus changing the third clamping block 3 and the fourth clamping block 4 to the aforementioned away state. After this, if the cylinder shaft of the second power member 24 retracts, the third clamping block 3 and the fourth clamping block 4 move closer to each other symmetrically relative to the imaginary plane VF under the force of the third spring 9 and the fourth spring 10 and the constraint of the second transmission assembly.

[0063] The first axis AX1 and the second axis AX2 are also imaginary lines, each defined by a pivot that passes through the first movable hinge block 5 and the second movable hinge block 6, but the reference numerals are omitted.

[0064] In addition, the tube threading auxiliary device 100 can not only assist in threading the tube TT onto the core rod PP so that the finning machine at the rear can process the tube TT to obtain a finned heat exchange tube TT, but also is used to remove the heat exchange tube TT from the finning machine.

[0065] In detail, the tube-threading auxiliary device 100 also includes a second housing 22 fixed to the aforementioned first housing 21, and a pair of clamping rollers and a motor 31 mounted to the second housing 22. The second housing 22 also has a generally cuboid shape and includes a body portion facing the opening and a cover plate portion that is detachably fastened to the opening by bolts. In the tube-threading direction DR1, the pressure roller pair is arranged upstream of the aforementioned first clamping mechanism and second clamping mechanism, and includes a first clamping roller 25 and a second clamping roller 26. The motor 31 drives the first clamping roller 25 and the second clamping roller 26 to rotate via a gear transmission mechanism at least partially housed within the second housing 22.

[0066] During the tube insertion process, the tube TT is clamped from both radial sides by the first clamping roller 25 and the second clamping roller 26 with appropriate clamping force, thereby holding the tube TT in a predetermined position. The tube feeding mechanism 200 (which may be a trolley in a straight shape on a track) located upstream of the clamping roller pair applies a driving force to the tube TT, thereby driving the tube TT to move along the insertion direction DR1.

[0067] During the tube TT removal process, the tube TT is clamped from both radial sides by the first clamping roller 25 and the second clamping roller 26 with appropriate clamping force, and the first clamping roller 25 and the second clamping roller 26 are rotated under the drive of the motor 31, thereby driving the tube TT to exit from the fin machine.

[0068] In addition, a guide sleeve 27 with a larger inner diameter is disposed between the aforementioned clamping roller pair and the first clamping mechanism to receive the tube TT from the clamping roller pair, and the inner wall of the guide sleeve 27 blocks and limits the outer surface of the tube TT to prevent the tube TT from deflecting at a large angle during its movement toward the first clamping mechanism, so that the tube head TT1 can be successfully received by the first flared mouth 38.

[0069] Furthermore, a sensor 28, electrically connected to the first power member 23 and the second power member 24 respectively, is mounted on the guide sleeve 27. This sensor 28 is configured to detect whether the tube head TT1 of the tube TT has reached a predetermined position, which is a position near the first and second clamping mechanisms, and also a position upstream of the first and second clamping mechanisms. For example, the sensor 28 can be a photoelectric sensor 28. When the tube head TT1 moves to the position of the sensor 28, the tube head TT1 blocks the corresponding light path, thereby generating a response signal in the sensor 28. The generation of this response signal can be interpreted by the sensor 28 as the tube head TT1 having reached the predetermined position.

[0070] Furthermore, the power component is configured to: in response to the sensor 28 detecting that the tube head TT1 has reached a predetermined position, after a preset delay, switch the clamping mechanism from the clamping state to the releasing state; wherein the preset delay is not less than the time taken for the tube head TT1 to move from the aforementioned predetermined position to the rod head PP1 (more specifically, the end portion PP11 of the rod head).

[0071] Next, please combine them together. Figures 1 to 8 The method of threading the tube TT onto the mandrel PP using the aforementioned tube threading auxiliary device 100 is described in more detail. The method includes the following steps S801 to S804: S801, by having the first clamping mechanism elastically clamp the tube head TT1 of the tube TT and the second clamping mechanism clamp the rod head PP1 of the core rod PP, the tube head TT1 and the rod head PP1 are aligned in the sleeve direction DR1.

[0072] In one embodiment, firstly, the cylinder shafts of both the first motor component and the second power component 24 are in a retracted state. As a result, the first clamping block 1 and the second clamping block 2 of the first clamping mechanism are brought close to each other in a first initial state—that is, the aforementioned close state—under the elastic force of the first spring 7 and the second spring 8. The third clamping block 3 and the fourth clamping block 4 of the second clamping mechanism are brought close to each other in a second initial state under the elastic force of the third spring 9 and the fourth spring 10. A third flared opening 40 for the rod head PP1 to enter is formed between the third clamping block 3 and the fourth clamping block 4 in the second initial state. Moreover, compared with the aforementioned clamping state, the third clamping block 3 and the fourth clamping block 4 in the second initial state are closer to each other. In other words, compared with the second initial state, the third clamping block 3 and the fourth clamping block 4 in the clamping state are further away from each other. At this time, the tube TT has not yet entered between the first clamp 1 and the second clamp 2, and the core rod PP has not yet entered between the third clamp 3 and the fourth clamp 4. The second biasing member has a tendency to keep the third clamp 3 and the fourth clamp 4 in this second initial state.

[0073] Subsequently, the core rod PP moves in the opposite direction of the aforementioned sleeve-passing direction DR1 under the drive of the rod feeding mechanism 500 on the rear end side (i.e., the side where the fin machine is located). The positional accuracy of the core rod PP's head PP1 near the second clamping mechanism is difficult to guarantee (for example, due to the vibration of the core rod PP itself), and it usually appears randomly within a certain position range. Advantageously, an outwardly flared third flared opening 40 is formed between the third clamping block 3 and the fourth clamping block 4 in the second initial state. This third flared opening 40 can easily receive the forward-moving head PP1 (even if the head PP1 may have a large position range), and after receiving the head PP1, more specifically the tip portion PP11 of the head PP1, the inner wall surface of the third flared opening 40 can guide the head PP1 to the straightening position between the third clamping block 3 and the fourth clamping block 4. Furthermore, when the clubhead PP1 contacts the third clamping block 3 and the fourth clamping block 4 and continues to move, the third clamping block 3 and the fourth clamping block 4, due to the force exerted by the clubhead PP1, overcome the elastic forces of the third spring 9 and the fourth spring 10 respectively and move symmetrically away from the imaginary plane VF. That is, the moving clubhead PP1 symmetrically pushes away the third clamping block 3 and the fourth clamping block 4 along the clamping direction DR2, thereby providing clearance space for the continued movement of the clubhead PP1. Moreover, during the period when the tube head TT1 pushes away the third clamping block 3 and the fourth clamping block 4 and continues to move, since the elastic biasing force exerted by the second biasing member on the third clamping block 3 and the fourth clamping block 4 towards the second initial state still exists, the clubhead PP1 becomes a state of being elastically clamped by the third clamping block 3 and the fourth clamping block 4. Under the action of this elastic clamping force, the clubhead PP1, which may have been misaligned, is straightened by the centering movement of the third clamping block 3 and the fourth clamping block 4, and the central axis of the clubhead PP1 coincides with the imaginary straight line AX. That is, the clubhead PP1 moves toward the clubhead PP1 while being elastically clamped by the third clamping block 3 and the fourth clamping block 4. The clubhead PP1 stops moving only after its tip PP11 has moved to a predetermined position within the second flared opening 39 between the third clamping block 3 and the fourth clamping block 4. At this point, the third clamping block 3 and the fourth clamping block 4, or the second clamping mechanism, are in the aforementioned clamping state.

[0074] In addition, the tube TT moves toward the first clamping mechanism under the drive of the tube feeding mechanism 200 on the front end side. When the tube head TT1 moves through the first flared mouth 38 and is elastically clamped between the first clamping block 1 and the second clamping block 2, the central axis of the tube head TT1 also coincides with the imaginary straight line AX. The tube head TT1 and the rod head PP1 are aligned in the sleeve direction DR1.

[0075] In another embodiment, the cylinder shaft of the second power member 24 can be extended first, so that the third clamping block 3 and the fourth clamping block 4 are in a released state, far apart from each other, and a flared opening for receiving the rod head PP1 is formed between the third clamping block 3 and the fourth clamping block 4 in this released state. It is understood that this flared opening helps to better guide the rod head PP1 of the core rod PP moving toward the second clamping assembly into the clamping space between the third clamping block 3 and the fourth clamping block 4, especially when the distance between the third clamping block 3 and the fourth clamping block 4 (even when they are in the released state) is not large enough. Then, after the rod head PP1 enters the clamping space between the third clamping block 3 and the fourth clamping block 4 through the flared opening, the cylinder shaft of the second power member 24 is retracted, and the rod head PP1 is in a state of being elastically clamped and straightened by the third clamping block 3 and the fourth clamping block 4.

[0076] S802, by moving the tube TT along the sleeve direction DR1, the tube head TT1 is sleeved on the rod head PP1.

[0077] When the tube head TT1 is elastically clamped by the first clamping mechanism and the rod head PP1 is clamped by the second clamping mechanism, thereby aligning the tube head TT1 and the rod head PP1 in the sleeve direction DR1, the tube head TT1 can be easily sleeved onto the rod head PP1 by moving the tube TT along the sleeve direction DR1.

[0078] In most cases, when the tube head TT1 moves towards the rod head PP1 while being elastically clamped by the first clamp 1 and the second clamp 2, the central axis of the tube head TT1 maintains good alignment with the aforementioned imaginary straight line AX. Therefore, even if the aforementioned second flared opening 39 does not exist between the third clamp 3 and the fourth clamp 4 in the clamped state, for example, if the tip portion PP11 of the rod head PP1 is in... Figure 1 If the third clamp 3 and the fourth clamp 4 extend outwards to the left side, the tube head TT1 can also be successfully fitted onto the club head PP1, or more specifically, the tip portion PP11 of the club head PP1. Therefore, in these cases, omitting the second bell mouth 39 is also feasible.

[0079] However, an unexpected situation may occur: when the tube head TT1 moves towards the rod head PP1 while being elastically clamped by the first clamp 1 and the second clamp 2, the alignment of the central axis of the tube head TT1 with the imaginary straight line AX is not well maintained. For example, the tube head TT1 may vibrate when it is very close to the tip of the rod head PP1. In this case, it is advantageous to configure the second flare 39: the inner wall surface of the second flare 39 can contact the tip of the tube head TT1 before the tip portion PP11 of the rod head PP1, thereby using the inner wall surface of the second flare 39 to straighten the vibrating tube head TT1 to a position precisely aligned with the tip of the rod head PP1; and during this process, the elastic bias force applied by the third spring 9 and the fourth spring 10 to the third clamp 3 and the fourth clamp 4 is relatively large (usually greater than the elastic bias force applied by the first spring 7 and the second spring 8 to the first clamp 1 and the second clamp 2), so that the tip of the tube head TT1 will not push away the third clamp 3 and the fourth clamp 4, and the rod head PP1 is always in a stable clamped state.

[0080] S803, control the first clamping mechanism to release the tube head TT1 to form a first channel for the tube TT to pass through at the first clamping mechanism, and control the second clamping mechanism to release the rod head PP1 to form a second channel for the tube TT to pass through at the second clamping mechanism.

[0081] With the tube TT1 already threaded onto the rod head PP1, thus completing the connection between the tube TT and the core rod PP, the first power member 23 and the second power member 24 can be used to keep the first clamping block 1 and the second clamping block 2 in a distanced state, and to keep the third clamping block 3 and the fourth clamping block 4 in a released state, thereby reducing the resistance encountered by the tube TT during the continued threading process. The first channel can be interpreted as the gap between the first clamping block 1 and the second clamping block 2, and the second channel can be interpreted as the gap between the third clamping block 3 and the fourth clamping block 4.

[0082] For example, in response to sensor 28 detecting that tube tip TT1 has reached a predetermined position, after a preset time interval, the first power member 23 drives the first clamping block 1 and the second clamping block 2 to switch to a remote state, and the second power member 24 drives the third clamping block 3 and the fourth clamping block 4 to switch to a remote state. The aforementioned preset time interval can be determined in advance based on the moving speed of tube TT and the distance between sensor 28 and the second clamping mechanism. Generally speaking, the preset time interval should not be less than the time it takes for tube tip TT1 to move from the predetermined position to the rod tip PP1 (more specifically, the end part PP11 of the rod tip), so as to ensure that when the third clamping block 3 and the fourth clamping block 4 are switched to a remote state, tube tip TT1 has been fitted onto rod tip PP1. In some embodiments, the aforementioned preset duration is optimized so that when the second power member 24 just begins to drive the third clamp 3 and the fourth clamp 4 to switch to the release state, the tube end TT1 is just inserted into the end portion PP11 of the rod end PP1, before a relatively large thrust is applied to the third clamp 3 and the fourth clamp 4. Therefore, this helps to protect the structure of the tube TT. In other embodiments, the aforementioned preset duration may be set to a longer duration or the movement speed of the tube TT may unexpectedly increase. This results in the tube end TT1 having already pushed open the third clamp 3 and the fourth clamp 4 with the help of the second flared end 39 and moving between the third clamp 3 and the fourth clamp 4 in an elastically clamped state before the second power member 24 drives the third clamp 3 and the fourth clamp 4 to switch to the release state, thus not affecting the smooth progress of the tube insertion action. For example, the preset duration may be 2 seconds.

[0083] S804 causes tube TT to move along the sleeve direction DR1 via the first and second channels.

[0084] In some embodiments, in order to allow the core rod PP to retract to the rear finning machine so that the tube TT can be supported in the finning machine to process fins, the core rod PP can also move along the sleeve direction DR1 after the first power member 23 and the second power member 24 open the first clamping mechanism and the second clamping mechanism respectively. However, the moving speed of the core rod PP is less than the moving speed of the tube TT, thereby finally completing the sleeve operation of the tube TT on the core rod PP.

[0085] Based on the description above and see also Figure 3 This application also provides a tube-threading device, which includes a tube feeding mechanism 200, a tube support 300, a rod feeding mechanism 500, a core rod PP support, and the aforementioned tube-threading auxiliary device 100.

[0086] The tube support 300 supports the tube TT to be sleeved on the upstream side of the first clamping mechanism along the sleeve insertion direction DR1. Exemplarily, the tube support 300 may be a series of support rollers spaced apart along the length direction of the tube TT.

[0087] The core rod PP support body supports the core rod PP on the downstream side of the second clamping mechanism along the sleeve direction DR1. For example, the rod support body 400 may be a series of support rollers spaced apart along the length direction of the core rod PP.

[0088] The tube feeding mechanism 200 is used to drive the tube TT to move along the sleeve direction DR1. Exemplarily, the tube feeding mechanism 200 may be a pusher trolley that travels on a straight track that extends along the length of the tube TT.

[0089] The rod feeding mechanism 500 can drive the core rod PP to move along the sleeve insertion direction DR1 and in the opposite direction of DR1. By driving the core rod PP to move along the sleeve insertion direction DR1, the rod feeding mechanism 500 delivers the rod head PP1 of the core rod PP to the rod insertion preparation position, which is elastically held by the second clamping mechanism. By driving the core rod PP to move in the opposite direction of DR1, the rod feeding mechanism 500 retracts the core rod PP into the finning machine on the rear end side, so that fins capable of enhancing heat transfer can be processed on the tube wall in the finning machine. Exemplarily, the rod feeding mechanism 500 may include a gripper capable of selectively tightening and loosening the core rod PP, and a cylinder driving the gripper to reciprocate along the length direction of the core rod PP. By rhythmically tightening and loosening the gripper during the reciprocating movement of the gripper along the length direction of the core rod PP driven by the cylinder, the core rod PP can be selectively moved along the sleeve insertion direction DR1 or in the opposite direction of DR1.

Claims

1. A tube-threading auxiliary device for assisting in threading a tube onto a core rod, characterized in that, include: A support member that defines an imaginary straight line extending along the sleeve direction of the tube; A first clamping mechanism is mounted to the support member and configured to elastically clamp the tube head in such a way that the central axis of the tube head coincides with the imaginary straight line, and allows the tube head to move along the sleeve direction while its axis remains coincident with the imaginary straight line. A second clamping mechanism, which is mounted to the support member and located downstream of the first clamping mechanism in the sleeve direction, is configured to clamp the rod head of the core rod in such a way that the central axis of the rod head coincides with the imaginary straight line; The first clamping mechanism includes: A first clamping block and a second clamping block are configured to move symmetrically with respect to an imaginary plane and have a relatively close approach state and a relatively far away state; in the close approach state, a first flared opening is formed between the first clamping block and the second clamping block for the tube head to enter; wherein the imaginary straight line extends in the imaginary plane; A first biasing member elastically biases the first clamp and the second clamp toward the proximity state; When the first clamp and the second clamp are in the close proximity state, in response to the tube head entering the first flared opening along the sleeve direction, the first clamp and the second clamp are pushed, and the first clamp and the second clamp overcome the elastic bias force of the first bias member and move symmetrically away from the imaginary plane, thereby causing the tube head to be elastically clamped by the first clamp and the second clamp. The rod head includes a distal portion facing the first clamping mechanism and a non-terminal portion continuous with the distal portion; the second clamping mechanism includes: A third and a fourth clamping block are configured to move symmetrically with respect to an imaginary plane and have a clamping state that is relatively close to each other and a releasing state that is relatively far apart. In the clamping state, the third and fourth clamping blocks clamp the non-terminal portion from radial sides respectively, and a second flared opening is formed between the third and fourth clamping blocks, facing the first clamping mechanism, for the tube head to enter. The terminal portion is located within the second flared opening. In the releasing state, the third and fourth clamping blocks release the core rod, and a channel is formed between them for the tube to pass through. The second biasing member elastically biases the third and fourth clamping blocks toward the clamping state.

2. The tube-piercing auxiliary device according to claim 1, characterized in that, The first clamping block has a first clamping surface and the second clamping block has a second clamping surface. The first clamping surface and the second clamping surface clamp the tube head from both radial sides, and the first clamping surface and the second clamping surface are formed as concave surfaces symmetrical about the imaginary line.

3. The tube-piercing auxiliary device according to claim 1, characterized in that, The first clamping mechanism includes: A first power element is configured to keep the first clamping block and the second clamping block in the said far-away state; When the first clamp and the second clamp are in the distanced state, the first clamp and the second clamp release the tube.

4. The tube-piercing auxiliary device according to claim 1, characterized in that, The first biasing member includes: A first spring applies a first elastic force toward the second clamping block to the first clamping block; The second spring applies a second elastic force toward the first clamping block to the second clamping block; A first adjusting screw is connected to the first spring and can be operated to adjust the magnitude of the first spring force; The second adjusting screw is connected to the second spring and can be operated to adjust the magnitude of the second spring force.

5. The tube-piercing auxiliary device according to claim 1, characterized in that, The second clamping mechanism includes: The second power component is configured to hold the third and fourth clamping blocks in the released state.

6. A tube-insertion device, characterized in that, include: The tube-piercing auxiliary device as described in any one of claims 1 to 5; A tube support body that supports the tube to be sleeved on the upstream side of the first clamping mechanism along the sleeved direction; A core rod support body that supports the core rod on the downstream side of the second clamping mechanism along the sleeve direction; A tube feeding mechanism that drives the tube to move along the sleeve direction.

7. A method for threading a tube, characterized in that, The method, performed using the tube-penetrating aid as described in any one of claims 1 to 5, comprises: The tube head and the rod head are aligned by elastically clamping the tube head with the first clamping mechanism and clamping the rod head with the second clamping mechanism. The tube is moved along the sleeve direction to allow the tube head to be sleeved on the rod head; The first clamping mechanism is controlled to release the tube head to form a first channel for the tube to pass through at the first clamping mechanism, and the second clamping mechanism is controlled to release the rod head to form a second channel for the tube to pass through at the second clamping mechanism; The tube is moved sequentially through the first channel and the second channel along the sleeve direction.

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