Clamping mechanism and pipe penetrating device

Abstract

The utility model relates to a clamping mechanism and a pipe penetrating device, and the clamping mechanism comprises two clamping blocks which are respectively provided with two clamping surfaces, and the two clamping surfaces are configured to be centrosymmetric about an imaginary straight line; the transmission assembly is connected with the two clamping blocks; the two clamping blocks symmetrically move relative to the imaginary plane under the constraint of the transmission assembly, and the imaginary straight line extends in the imaginary plane in the penetrating and sleeving direction. The biasing component is used for applying elastic force to the two clamping blocks, so that the clamping mechanism is biased towards the initial state; in an initial state, the two clamping blocks are relatively close to each other, and a horn mouth for receiving a rod head is formed between the two clamping blocks; in the clamping state, the two clamping blocks are relatively far away from each other and elastically clamp the rod head from the two radial sides respectively; in the release state, the two clamping blocks are further away from each other to release the rod head, and a channel for a pipe to pass through is formed; under the condition that the clamping mechanism is in the initial state, the rod head is guided by the horn mouth to enter the position between the two clamping blocks in the mode of pushing away the two clamping blocks, and therefore the rod head is converted into the clamping state.

Description

Technical Field

[0001] The present application relates to the technical field of machining, and in particular to a clamping mechanism and a pipe threading device for positioning a cylindrical workpiece, especially a pipe or a rod. Background Art

[0002] In nuclear power units, the Moisture Separator Reheater (MSR) is an indispensable key equipment. There are a large number of high-efficiency heat exchange tubes inside the Moisture Separator Reheater. Usually, the outer fins and inner reinforced threads (or inner fins) need to be processed on the wall of each high-efficiency heat exchange tube as required. In some application scenarios, since the length of the heat exchange tube in the Moisture Separator Reheater is nearly 40 meters, when processing the outer fins or inner fins of the heat exchange tube, it is necessary to put the tube blank on a long core rod in advance, that is, to place the core rod in the tube blank, and use the core rod to provide support for the tube blank to process the outer fins or inner fins.

[0003] In order to successfully complete the threading of the tube blank and the core rod, it is necessary to position the core rod (for example, using a positioning tool) so that it can stably receive the front end tube head of the tube blank. In addition, how to prevent the positioning tool from interfering with or hindering the threading operation of the tube blank and the core rod is a problem that needs to be studied. Summary of the invention

[0004] In view of this, the present application proposes a clamping mechanism and a pipe threading device.

[0005] In a first aspect, a clamping mechanism is provided for clamping a rod head of a core rod for a tube to be inserted into a sleeve, the clamping mechanism having an initial state, a release state, and a clamping state between the initial state and the release state, and comprising:

[0006] Two clamping blocks, each having two clamping surfaces for clamping the rod head from two radial sides, wherein the two clamping surfaces are configured to be centrally symmetrical about an imaginary straight line;

[0007] A transmission assembly, connecting the two clamping blocks; the two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly, wherein the imaginary straight line extends along the sleeve insertion direction in the imaginary plane;

[0008] a biasing member for applying an elastic force to the two clamping blocks so as to elastically bias the clamping mechanism toward the initial state;

[0009] In the initial state, the two clamping blocks are relatively close to each other, and a bell mouth for receiving the rod head is formed therebetween;

[0010] In the clamping state, the two clamping blocks are relatively far away from each other and elastically clamp the rod head from two radial sides respectively;

[0011] In the released state, the two clamps are further separated to release the rod head, and a passage is formed between the two for the tube to pass through;

[0012] Wherein, when the clamping mechanism is in the initial state, the rod head, under the guidance of the bell mouth, enters between the two clamping blocks in a manner of pushing the two clamping blocks apart, thereby switching the clamping mechanism to the clamping state.

[0013] In some possible implementations, the club head includes a distal portion and a non-distal portion continuous with the distal portion;

[0014] In the clamping state, another bell mouth corresponding to the pipe head of the pipe is formed between the two clamping blocks, the two clamping surfaces clamp the non-distal part, and the distal part extends into the bell mouth;

[0015] Wherein, the tube head is inserted onto the rod head under the guidance of the other bell mouth;

[0016] In the clamping state, another bell mouth corresponding to the pipe head of the pipe is formed between the two clamping blocks, the two clamping surfaces clamp the non-distal part, and the distal part extends into the bell mouth;

[0017] Wherein, the tube head is inserted onto the rod head under the guidance of the other bell mouth;

[0018] Preferably, the clamping surface is a concave arc surface or an elliptical arc surface.

[0019] In a second aspect, a clamping mechanism is proposed, comprising:

[0020] Two clamping blocks, each having two clamping surfaces for clamping the tube head of the tube from both radial sides, the two clamping surfaces being constructed to be centrally symmetrical about an imaginary straight line; the two clamping blocks have a close state, a far state, and an intermediate state between the close state and the far state; in the close state, the two clamping blocks are relatively close to each other, and a bell mouth for receiving the tube head is formed between the two; in the intermediate state, the two clamping blocks are relatively far away and the clamping surfaces are used to elastically clamp the tube head from both radial sides; in the far state, the two clamping blocks are further away from each other to release the tube head, and a passage for the tube to pass through is formed between the two;

[0021] A transmission assembly, connecting the two clamping blocks; the two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly, wherein the imaginary straight line extends along the sleeve insertion direction in the imaginary plane;

[0022] A biasing member applies an elastic force to the two clamping blocks, so that the two clamping blocks are elastically biased toward the close state;

[0023] Wherein, when the two clamping blocks are in the close state, the rod head enters between the two clamping blocks under the guidance of the bell mouth, thereby converting the two clamping blocks to the intermediate state.

[0024] In a third aspect, the present application provides a pipe threading device for threading a pipe onto a core rod, comprising:

[0025] A tube feeding mechanism, configured to drive the tube to move along a sleeve insertion direction;

[0026] The clamping mechanism has a clamping state and a releasing state; in the clamping state, the clamping mechanism clamps the rod head in such a way that the rod head of the core rod is aligned with the tube head of the tube; in the releasing state, the clamping mechanism releases the rod head and forms a passage for the tube to pass through;

[0027] a power member configured to actuate the clamping mechanism so as to switch the clamping mechanism from the clamping state to the releasing state;

[0028] A sensor, electrically connected to the power member, and configured to detect whether the pipe head reaches a predetermined position, wherein the predetermined position is a position near the clamping mechanism, and in the sleeve-threading direction, the predetermined position is located on the upstream side of the clamping mechanism;

[0029] The power member is configured to: in response to the sensor detecting that the tube head reaches the predetermined position, after a delay of a preset time, switch the clamping mechanism from the clamping state to the releasing state; wherein the preset time is not less than the time taken by the tube head to move from the predetermined position to the rod head.

[0030] In some possible implementations, the pipe threading device further includes a supporting member for mounting the clamping mechanism, and the clamping mechanism includes two clamping blocks that can move relatively on the supporting member;

[0031] In the clamping state, the two clamping blocks are relatively close to clamp the rod head from both radial sides, and a bell mouth for receiving the pipe head is formed between the two clamping blocks;

[0032] In the release state, the two clamping blocks are relatively separated to release the rod head and form the channel between the two.

[0033] Wherein, the tube head is inserted onto the rod head under the guidance of the bell mouth.

[0034] In some possible implementations, the club head includes a distal portion and a non-distal portion continuous with the distal portion;

[0035] In the clamping state, the two clamping blocks clamp the non-tip portion, and the tip portion extends into the bell mouth.

[0036] In some possible implementations, in the released state, another bell mouth opposite to the bell mouth is formed between the two clamping blocks, and the rod head enters between the two clamping blocks under the guidance of the other bell mouth and is elastically clamped by the two clamping blocks.

[0037] In some possible implementations, the clamping mechanism further has an initial state, and compared with the clamping state, the two clamping blocks in the initial state are closer to each other;

[0038] In the initial state, another bell mouth is formed between the two clamping blocks to receive the rod head;

[0039] The clamping mechanism comprises:

[0040] A transmission assembly, connecting the two clamping blocks;

[0041] a biasing member for applying an elastic force to the two clamping blocks so as to elastically bias the clamping mechanism toward the initial state;

[0042] The two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly;

[0043] The two clamping blocks respectively have two clamping surfaces for clamping the non-tip portion from two sides, and the two clamping surfaces are configured to be centrally symmetrical about an imaginary straight line, and the imaginary straight line extends along the sleeve insertion direction in the imaginary plane;

[0044] When the clamping mechanism is in the initial state, the rod head, under the guidance of the other bell mouth, enters between the two clamping blocks in a manner of pushing the two clamping blocks apart, thereby switching the clamping mechanism to the clamping state.

[0045] In some possible implementations, the transmission assembly includes:

[0046] A movable hinge block is mounted to the support member in a manner of rotating about a rotation axis and has two guide holes, wherein the two guide holes are configured to be centrally symmetrical about the rotation axis;

[0047] Two connecting shafts, respectively movably inserted into the two guide holes and respectively connected to the two clamping blocks;

[0048] The power member is a cylinder that drives the movable hinge block to rotate.

[0049] In some possible implementations, the biasing member includes:

[0050] two springs, respectively applying elastic force to one of the two clamping blocks toward the other of the two clamping blocks;

[0051] Two adjusting screw rods are respectively connected to the two springs and can be rotated to adjust the magnitude of the elastic force.

[0052] According to the pipe threading device provided by the present application, the core rod is clamped at different length positions by multiple clamping mechanisms, thereby ensuring the straightness of the core rod and suppressing the bending deformation of the core rod under the action of gravity. When the tube blank is inserted to the position of the corresponding clamping mechanism, the clamping mechanism correspondingly loosens the core rod, thereby leaving space for the tube blank to be inserted downstream, and the downstream clamping mechanism continues to maintain a clamping state, so that the core rod section that has not been inserted by the tube blank still maintains an ideal straightness. In this way, a long tube blank can be easily inserted outside a long core rod, so that in the subsequent processing of the tube blank, the core rod provides a supporting force for the tube blank toward the outer peripheral side. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0054] Figure 1 It is a structural schematic diagram of a pipe threading auxiliary device provided in one embodiment of the present application.

[0055] Figure 2 yes Figure 1 Schematic diagram of the structure of a part of .

[0056] Figure 3 yes Figure 1 The structure diagram of the pipe threading auxiliary device shown is applied to the pipe threading device.

[0057] Figure 4 yes Figure 2 AA section view.

[0058] Figure 5 yes Figure 2 BB section view.

[0059] Figure 6 yes Figure 3 Bottom view of a part of it.

[0060] Figure 7 yes Figure 1 Schematic diagram of the structure of the third clamping block.

[0061] Figure 8 It is a flow chart of a pipe threading method provided in one embodiment of the present application.

[0062] Description of reference numerals:

[0063] VF-imaginary plane, DR1-threading direction, DR2-clamping direction, AX-imaginary straight line, AX1-first axis, AX2-second axis;

[0064] TT-tube, TT1-tube head;

[0065] PP-core rod, PP1-rod head, PP11-distal part, PP12-non-distal part;

[0066] 1-first clamping block, 1a-first clamping surface,

[0067] 2- second clamping block, 2a- second clamping surface,

[0068] 3-third clamping block, 3a-third clamping surface;

[0069] 4-fourth clamping block, 4a-fourth clamping surface;

[0070] 5-first movable hinge block, 5a-first long hole, 5b-second long hole;

[0071] 6-second movable hinge block, 6a-third long hole, 6b-fourth long hole;

[0072] 7-first spring, 8-second spring, 9-third spring, 10-fourth spring;

[0073] 11-first stopper, 12-second stopper;

[0074] 13-first adjusting screw rod, 14-second adjusting screw rod, 15-third adjusting screw rod, 16-fourth adjusting screw rod;

[0075] 17-first screw rod seat, 17a-first sliding cavity;

[0076] 18-second screw rod seat, 18a-second sliding cavity;

[0077] 19-first top rod, 20-second top rod;

[0078] 21-first shell, 22-second shell;

[0079] 23-first power member, 24-second power member;

[0080] 25-first clamping roller, 26-second clamping roller, 27-guide sleeve, 28-sensor;

[0081] 29-first connecting shaft, 30-second connecting shaft, 31-motor;

[0082] 32-third screw rod seat, 32a-third sliding cavity;

[0083] 33- fourth screw rod seat, 33a- fourth sliding cavity;

[0084] 34- third connecting axis, 35- fourth connecting axis;

[0085] 36-third top rod, 37-fourth top rod;

[0086] 38-first bell mouth, 39-second bell mouth, 40-third bell mouth. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0088] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects, and, for example, the term "first element" itself does not mean the existence of the "second element", and the term "second element" itself does not mean the existence of the "first element". In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one, and "multiple" means not less than two.

[0089] In the description of the present application, the terms “including”, “having” indicate the existence of the described features, numbers, operations, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, numbers, operations, elements and / or their combinations.

[0090] In the description of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the present specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0091] Figures 1 to 7 A tube threading auxiliary device 100 provided in one embodiment of the present application is shown, which is used to assist the tube TT to be inserted on the core rod PP, so that the rear end fin machine can process fins on the tube wall of the tube TT under the support of the core rod PP, thereby obtaining a heat exchange tube TT with high heat exchange efficiency.

[0092] The tube threading auxiliary device 100 includes a supporting member and a first clamping mechanism and a second clamping mechanism installed on the supporting member. The first clamping mechanism and the second clamping mechanism are arranged in sequence along the threading direction DR1 of the tube TT, that is, in the threading direction DR1 of the tube TT, the second clamping mechanism is on the downstream side of the first clamping mechanism.

[0093] The supporting member includes a first shell 21 of a substantially rectangular parallelepiped shape, the first shell 21 having a main body portion opening upward and a cover portion detachably fastened to the opening by bolts. In addition, the first shell 21 defines a vertical imaginary plane VF and an imaginary straight line AX extending in the imaginary plane VF along the sleeve insertion direction DR1, that is, the imaginary plane VF and the imaginary straight line AX have a fixed positional relationship with the first shell 21. In addition, the imaginary plane VF is perpendicular to the cover portion of the first shell 21, and the imaginary straight line AX is parallel to the cover portion of the first shell 21.

[0094] The first clamping mechanism can elastically clamp the tube head TT1 of the tube TT in such a manner (referred to as manner one for convenience of explanation) that the central axis of the tube head TT1 coincides with the imaginary straight line AX, and allows the tube head TT1 to move along the insertion direction DR1 while keeping the central axis coincident with the imaginary straight line AX.

[0095] The second clamping mechanism can releasably clamp the head PP1 of the core rod PP in such a manner (referred to as the second manner for convenience of description) that the center axis of the head PP1 coincides with the imaginary straight line AX.

[0096] Therefore, when the first clamping mechanism clamps the tube head TT1 in the above-mentioned manner 1, and the second clamping mechanism clamps the rod head PP1 in the above-mentioned manner 2, the tube head TT1 is aligned with the rod head PP1 in the insertion direction DR1. Furthermore, when the relevant components (such as the tube delivery mechanism 200 described later) apply a suitably large force along the insertion direction DR1 to the tube TT, the first clamping mechanism elastically clamps the tube head TT1, guides the tube head TT1 to move toward the rod head PP1 while maintaining the alignment with the rod head PP1, so that the tube head TT1 is inserted on the rod head PP1.

[0097] In this embodiment, the position of the tube head TT1 is corrected by elastically rather than rigidly clamping the tube head TT1 of the tube TT by the first clamping mechanism, which has the following advantages: on the one hand, tubes TT of various diameters (outer diameters) can be easily clamped and positioned at the same reference position, that is, tubes TT of various diameters can be easily adapted; on the other hand, even if the tube head TT1 is in a clamped state, since the clamping mechanism has a certain elastic floating space, when an appropriately large force is applied to the tube TT along the insertion direction DR1, the tube head TT1 can move toward the club head PP1 while remaining elastically clamped by the first clamping mechanism (thereby ensuring that the tube head TT1 is always in a position aligned with the club head PP1), so that it can be smoothly inserted onto the club head PP1.

[0098] 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, wherein the first clamping block 1, the second clamping block 2 and the first biasing member are all arranged on the upper outside of the first shell 21, and the first power member 23 is arranged inside the first shell 21.

[0099] Each of the first clamp block 1 and the second clamp block 2 can move relative to the first shell 21 in the clamping direction DR2 perpendicular to the aforementioned imaginary plane VF. More specifically, the first clamp block 1 and the second clamp block 2 are connected to each other via a first transmission assembly, and under the constraint of the first transmission assembly, the first clamp block 1 and the second clamp block 2 move symmetrically (centering movement) relative to the aforementioned imaginary plane VF, that is, when the first clamp block 1 moves away from the imaginary plane VF, under the constraint of the first transmission assembly, the second clamp block 2 moves away from the imaginary plane VF on the other side of the imaginary plane VF at the same speed; when the second clamp block 2 moves close to the imaginary plane VF, under the constraint of the first transmission assembly, the first clamp block 1 moves close to the imaginary plane VF on the other side of the imaginary plane VF at the same speed.

[0100] Based on the relative movement of the first clamp block 1 and the second clamp block 2 in the clamping direction DR2, the first clamp block 1 and the second clamp block 2 selectively have a relatively close state and a relatively far state, and when the first clamp block 1 and the second clamp block 2 are in the close state, a first bell mouth 38 for the pipe head TT1 to enter is formed between the two. The first bell mouth 38 is located at the upstream end of the first clamp block 1 and the second clamp block 2 in the sleeve insertion direction DR1.

[0101] The first biasing member includes a first spring 7 and a second spring 8, wherein the first spring 7 applies an elastic force to the first clamp block 1 toward the second clamp block 2, and the second spring 8 applies an elastic force to the second clamp block 2 toward the first clamp block 1, whereby the first clamp block 1 and the second clamp block 2 have a tendency to approach each other under the forces of the first spring 7 and the second spring 8, respectively, and thus, the first spring 7 and the second spring 8 elastically bias the first clamp block 1 and the second clamp block 2 toward a close state.

[0102] In practice, when the first clamp block 1 and the second clamp block 2 are in a close state, the tube TT to be sleeved coming from the upstream side (e.g., the clamping roller pair described later) first enters the first bell mouth 38 between the first clamp block 1 and the second clamp block 2 along the sleeve-inserting direction DR1 with its tube head TT1. When the tube head TT1 contacts the first clamp block 1 and the second clamp block 2 and continues to move, the first clamp block 1 and the second clamp block 2 respectively overcome the elastic force of the first spring 7 and the second spring 8 due to the force of the tube head TT1 and move away symmetrically relative to the imaginary plane VF, that is, the tube head TT1 moving forward symmetrically pushes the first clamp block 1 and the second clamp block 2 away along the clamping direction DR2, thereby providing a space for the tube head TT1 to continue to move. Furthermore, during the period when the tube head TT1 pushes away the first clamp block 1 and the second clamp block 2 and continues to move forward, since the elastic biasing force applied by the first biasing member to the first clamp block 1 and the second clamp block 2 still exists, the tube head TT1 becomes elastically clamped by the first clamp block 1 and the second clamp block 2 (at this time, the first clamp block 1 and the second clamp block 2 can be understood as being in an intermediate state between the aforementioned approaching state and the distant state). Under the action of this elastic clamping force, the tube head TT1, which may have been displaced, is straightened by the first clamp block 1 and the second clamp block 2 that move in the center, 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 toward the club head PP1 while being elastically clamped by the first clamp block 1 and the second clamp block 2.

[0103] The position accuracy of the tube head TT1 of the tube TT to be sleeved coming from the upstream side (for example, the clamping roller pair described later) is difficult to guarantee, and it usually appears randomly within a certain position range. If the first clamping mechanism is omitted and the tube TT is directly pushed (for example, pushed by the tube feeding mechanism 200 described later) to move forward and thus the tube TT mouth moves forward, it is very likely that the tube TT mouth cannot be correctly aligned with the rod head PP1, resulting in tube insertion failure. Advantageously, in this embodiment, an outwardly expanded first bell mouth 38 is formed between the first clamping block 1 and the second clamping block 2 in a close state, and the first bell mouth 38 can easily receive the front end of the forward-moving tube head TT1 (even if the tube head TT1 may appear in a larger position range), and after receiving the tube head TT1, the inner wall surface of the bell mouth helps to guide the tube head TT1 to the straightening position between the first clamping block 1 and the second clamping block 2.

[0104] The first bell mouth 38 and the second bell mouth 39 and the third bell mouth 40 described later may each have an inner wall surface that is a smooth conical surface.

[0105] 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 respectively clamp the tube head TT1 from both radial sides (also both sides of the imaginary plane VF), and the first clamping surface 1a and the second clamping surface 2a are both formed as concave surfaces, and the shapes of the two concave surfaces are centrally symmetrical about the aforementioned imaginary line.

[0106] The first clamping surface 1a and the second clamping surface 2a may be concave arc surfaces symmetrical with respect to an imaginary parallel, for example, 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 the ellipse (such as Figure 4 ). In this way, after the tube 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 matching between the outer surface of the tube head TT1 (especially when the tube TT is a circular tube) and the two concave clamping surfaces, the tube head TT1 will automatically move to such a position: the two ends of one diameter of the tube head TT1 are respectively at the deepest part of the first clamping surface 1a and the deepest part of the second clamping surface 2a. And in this way, the tube heads TT1 of various diameters can be easily positioned to the aforementioned position-a position where the central axis of the tube head TT1 coincides with the imaginary straight line AX. In addition, since the first clamping block 1 and the second clamping block 2 are always in a symmetrical position relative to the imaginary plane VF, the first clamping surface 1a and the second clamping surface 2a always maintain a shape relationship that is centrally symmetrical about the imaginary straight line AX. When the tube head TT1 clamped by the first clamping block 1 and the second clamping block 2 moves forward, the central axis of the tube head TT1 can still be well maintained on the imaginary straight line AX.

[0107] The first power member 23 is specifically a cylinder, which is selectively connected to the first clamp block 1 and the second clamp block 2 via the first transmission assembly, and is configured to keep the first clamp block 1 and the second clamp block 2 in the aforementioned distanced state. In this embodiment, the first power member 23 can drive the first clamp block 1 and the second clamp block 2 to move away from each other via the first transmission assembly, and can keep the first clamp block 1 and the second clamp block 2 in the distanced state, but cannot drive the first clamp block 1 and the second clamp block 2 to move closer to each other, and the approaching movement of the first clamp block 1 and the second clamp block 2 is performed by the force of the aforementioned first biasing member.

[0108] Furthermore, when the first clamp block 1 and the second clamp block 2 are in the aforementioned distanced state, the first clamp block 1 and the second clamp block 2 release the tube TT, that is, the first clamp block 1 and the second clamp block 2 no longer exert elastic clamping force on the tube TT. Thus, when the tube head TT1 has been inserted into the rod head PP1 and the tube TT and the core rod PP have been connected, the first clamp block 1 and the second clamp block 2 can be in the distanced state to reduce the resistance encountered by the tube TT in the process of continuing to insert the tube TT.

[0109] In addition, the first biasing member also includes a first adjusting screw 13 and a second adjusting screw 14 with a hand wheel, and 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 implementation, the operator can change the position of the first adjusting screw 13 and the second adjusting screw 14 relative to the first housing 21 and the imaginary plane VF by rotating the first adjusting screw 13 and the second adjusting screw 14, thereby adjusting the initial compression amount of the first spring 7 and the second spring 8, and thereby adjusting the elastic force applied by the first spring 7 to the first clamp 1 and the elastic force applied by the second spring 8 to the second clamp 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, and 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 clamp 1 and the second clamp 2 always clamp the tubes TT of different diameters with substantially the same clamping force.

[0110] In detail, the first screw seat 17 and the second screw seat 18 are fixed on the cover plate of the first housing 21, the first screw seat 17 has a first sliding cavity 17a opening toward the first clamping block 1, and the second screw seat 18 has a second sliding cavity 18a opening toward the second clamping block 2. The first adjustment screw 13 and the second adjustment screw 14 are screwed with the first screw seat 17 and the second screw seat 18 respectively, and extend into the first sliding cavity 17a and the second sliding cavity 18a respectively. The first push rod 19 is slidably inserted into the first sliding cavity 17a, and one end of the first push rod 19 extends from the opening of the first sliding cavity 17a and is detachably fixed to the first clamping block 1. The first spring 7 is in a compressed state in the first sliding cavity 17a, butted between the first adjustment screw 13 and the first push rod 19. The second push rod 20 is slidably inserted into the second sliding cavity 18a, and one end of the second push rod 20 extends from the opening of the second sliding cavity 18a and is detachably fixed to the second clamping block 2. The second spring 8 abuts between the fourth adjusting screw rod 16 and the second push rod 20 in a compressed state in the second sliding cavity 18 a.

[0111] See also Figure 7 The rod head PP1 of the core rod PP includes a distal portion PP11 facing the first clamping mechanism and a non-distal portion PP12 continuous with the distal portion PP11, wherein the distal portion PP11 defines an axial end surface of the core rod PP.

[0112] Similar to the first clamping mechanism, the second clamping mechanism is configured to clamp the club 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 arranged outside the upper side of the first housing 21, and the second power member 24 is arranged inside the first housing 21.

[0113] Each of the third clamp block 3 and the fourth clamp block 4 can move relative to the first shell 21 in the clamping direction DR2 perpendicular to the aforementioned imaginary plane VF. More specifically, the third clamp block 3 and the fourth clamp block 4 are connected to each other via a second transmission assembly, and under the constraint of the second transmission assembly, the third clamp block 3 and the fourth clamp block 4 move symmetrically (centering movement) relative to the aforementioned imaginary plane VF, that is, when the third clamp block 3 moves away from the imaginary plane VF, under the constraint of the second transmission assembly, the fourth clamp block 4 moves away from the imaginary plane VF on the other side of the imaginary plane VF at the same speed; when the fourth clamp block 4 moves close to the imaginary plane VF, under the constraint of the second transmission assembly, the third clamp block 3 moves close to the imaginary plane VF on the other side of the imaginary plane VF at the same speed.

[0114] Based on the relative movement of the third clamp block 3 and the fourth clamp block 4 in the clamping direction DR2, the third clamp block 3 and the fourth clamp block 4 selectively have a clamping state of being relatively close and a releasing state of being relatively far away. It should be understood that the "relatively close" in the clamping state mentioned here is compared with the releasing state. When the third clamp block 3 and the fourth clamp block 4 are in the aforementioned clamping state, a second bell mouth 39 for the tube head TT1 to enter is formed between the third clamp block 3 and the fourth clamp block 4, and the third clamp block 3 and the fourth clamp block 4 clamp the non-tip part PP12 (not the tip part PP11) of the rod head PP1 from both sides of the radial direction, and the tip part PP11 of the rod head PP1 extends into the second bell mouth 39. The second bell mouth 39 is located at the upstream end of the third clamp block 3 and the fourth clamp block 4 in the sleeve insertion direction DR1. When the third clamp block 3 and the fourth clamp block 4 are in the aforementioned releasing state, the third clamp block 3 and the fourth clamp block 4 release the core rod PP, and a passage for the tube TT to pass through is formed between the two.

[0115] The second biasing member includes a third spring 9 and a fourth spring 10, wherein the third spring 9 applies an elastic force to the third clamp block 3 toward the fourth clamp block 4, and the fourth spring 10 applies an elastic force to the fourth clamp block 4 toward the third clamp block 3, thereby, the third clamp block 3 and the fourth clamp block 4 have a tendency to approach each other under the force of the third spring 9 and the fourth spring 10, respectively, so that the second biasing member makes the third clamp block 3 and the fourth clamp block 4 elastically biased toward the aforementioned clamping state. It should be understood that the second biasing member mentioned here makes the third clamp block 3 and the fourth clamp block 4 "elastically biased toward the clamping state" is relative to the release state; and relative to the clamping state, the second biasing member further makes the third clamp block 3 and the fourth clamp block 4 elastically biased toward the second initial state described later.

[0116] 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 respectively clamp the club head PP1 from both radial sides (which are also both sides of the imaginary plane VF), and the third clamping surface 3a and the fourth clamping surface 4a are both formed as concave surfaces, and the shapes of the two concave surfaces are centrally symmetrical about the aforementioned imaginary straight line VX.

[0117] The third clamping surface 3a and the fourth clamping surface 4a can be concave arc surfaces symmetrical to each other, for example, concave circular arc surfaces or concave elliptical arc surfaces. In this way, when the tube 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 matching between the outer surface of the club head PP1 (especially when the core rod PP is a round rod) and the two concave clamping surfaces, the club head PP1 will automatically move to such a position: the two ends of one diameter of the club head PP1 are respectively at the deepest point of the third clamping surface 3a and the deepest point of the fourth clamping surface 4a. And in this way, the club heads PP1 of various diameters can be easily positioned to the aforementioned position-a position where the central axis of the club head PP1 coincides with the imaginary straight line AX.

[0118] The third clamping surface 3a and the fourth clamping surface 4a may be concave arc surfaces with respect to the imaginary parallel symmetry, for example, concave circular arc surfaces or concave elliptical arc surfaces, wherein the elliptical arc surfaces are preferably elliptical arc surfaces on the radial side of the major axis of the ellipse (such as Figure 5 ). Thus, after the tube 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 matching between the outer surface of the club head PP1 (especially when the club head PP1 is a cylindrical shape) and the two concave clamping surfaces, the club head PP1 will automatically move to such a position: the two ends of one diameter of the club head PP1 are respectively at the deepest part of the third clamping surface 3a and the deepest part of the fourth clamping surface 4a. And in this way, the club heads PP1 of various diameters can be easily positioned to the aforementioned position - the position where the central axis of the club head PP1 coincides with the imaginary straight line AX.

[0119] The second power member 24 is specifically a cylinder, which is selectively connected to the third clamp block 3 and the fourth clamp block 4 via the second transmission assembly, and is configured to keep the third clamp block 3 and the fourth clamp block 4 in the aforementioned release state. In this embodiment, the second power member 24 can drive the third clamp block 3 and the fourth clamp block 4 to move away from each other via the second transmission assembly, and can keep the third clamp block 3 and the fourth clamp block 4 in the release state, but cannot drive the third clamp block 3 and the fourth clamp block 4 to move closer to each other, and the closer movement of the third clamp block 3 and the fourth clamp block 4 is performed by the force of the aforementioned second biasing member.

[0120] As mentioned above, when the third clamp block 3 and the fourth clamp block 4 are in the released state, the third clamp block 3 and the fourth clamp block 4 release the core rod PP, and a passage for the tube TT to pass through is formed between the third clamp block 3 and the fourth clamp block 4. The third clamp block 3 and the fourth clamp block 4 do not apply elastic clamping force to the tube TT. Therefore, when the tube TT has been inserted into the rod head PP1, the second power member 24 can put the third clamp block 3 and the fourth clamp block 4 in the released state to reduce the resistance encountered by the tube TT in the process of continuing to insert the tube TT.

[0121] In addition, the second biasing member also includes a third adjusting screw 15 and a fourth adjusting screw 16 with a hand wheel, and 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 implementation, the operator can change the position of the third adjusting screw 15 and the fourth adjusting screw 16 relative to the first housing 21 and the imaginary plane VF by rotating the third adjusting screw 15 and the fourth adjusting screw 16, thereby adjusting the initial compression amount of the third spring 9 and the fourth spring 10, and thereby adjusting 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 rod diameter of the core rod PP is small, the initial elastic force of the third spring 9 and the fourth spring 10 is increased, and when the rod diameter is large, the initial elastic force of the third spring 9 and the fourth spring 10 is decreased, so that the third clamping block 3 and the fourth clamping block 4 always clamp the core rod PP of different rod diameters with substantially the same clamping force.

[0122] In detail, the cover plate of the first housing 21 is fixed with a third screw seat 32 and a fourth screw seat 33, the third screw seat 32 has a third sliding cavity 32a opening toward the third clamping block 3, and the fourth screw seat 33 has a fourth sliding cavity 33a opening toward the fourth clamping block 4. The third adjusting screw 15 and the fourth adjusting screw 16 are screwed with the third screw seat 32 and the fourth 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 from the opening of the third sliding cavity 32a and is detachably fixed to the third clamping block 3. The third spring 9 is in a compressed state in the third sliding cavity and abuts between the third adjusting screw 15 and the third push rod 36. The fourth push rod 37 is slidably inserted into the fourth sliding cavity 33a, and one end of the fourth push rod 37 extends from the opening of the fourth sliding cavity 33a and is detachably fixed to the fourth clamping block 4. The fourth spring 10 is in a compressed state in the fourth sliding cavity 33 a and abuts between the fourth adjusting screw 16 and the fourth push rod 37 .

[0123] 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 installed inside the first shell 21 in a manner that it can rotate around the first axis AX1, and a first elongated hole 5a and a second elongated hole 5b (or a first guide hole and a second guide hole) are provided thereon, and the first elongated hole 5a and the second elongated hole 5b are centrally symmetrically arranged 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 can be 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 can be movably inserted into the second elongated hole 5b. In addition, the first movable hinge block 5 has a first stopper 11 extending downward, which serves as a cylinder of the first power member 23 and has a cylinder shaft that moves toward and away from the first stopper 11. Thus, when the cylinder shaft of the first power member 23 is in Figure 6 When the first movable hinge 5 extends outward (i.e., to the left), the first stopper 11 pushes the first movable hinge 5 to rotate clockwise around the first axis AX1. Under the guidance of the first long hole 5a and the second long hole 5b (in addition, the first clamp 1 and the second clamp 2 are also limited by the aforementioned first push rod 19 and the second push rod 20 and other components and can only move in the direction perpendicular to the imaginary plane VF), the first connecting shaft 29 and the second connecting shaft 30 are symmetrically away from each other relative to the imaginary plane VF, thereby driving the first clamp 1 and the second clamp 2 to be symmetrically away from each other relative to the imaginary plane VF, so that the first clamp 1 and the second clamp 2 are converted to the aforementioned away state. After that, if the cylinder shaft of the first power member 23 is retracted, under the force of the first spring 7 and the second spring 8 and the constraint of the first transmission assembly, the first clamp 1 and the second clamp 2 are symmetrically close to each other relative to the imaginary plane VF.

[0124] Similar to the case of 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 installed inside the first shell 21 in a manner that it can rotate around the second axis AX2, and a third elongated hole 6a and a fourth elongated hole 6b (or a third guide hole and a fourth guide hole) are provided thereon, and the third elongated hole 6a and the fourth elongated hole 6b are centrally symmetrically arranged 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 can be 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 can be movably inserted into the fourth elongated hole 6b. In addition, the second movable hinge block 6 has a second stopper 12 extending downward, which serves as the cylinder of the second power member 24 and has a cylinder shaft that moves toward and away from the second stopper 12. Therefore, when the cylinder shaft of the second power member 24 is in Figure 6When the second movable hinge 6 extends outward (i.e., to the left), the second stopper 12 pushes the second movable hinge 6 to rotate clockwise around the second axis AX2. Under the guidance of the third long hole 6a and the fourth long hole 6b (in addition, the third clamp 3 and the fourth clamp 4 are also limited by the aforementioned third push rod 36 and the fourth push rod 37 and other components and can only move in the direction perpendicular to the imaginary plane VF), the third connecting shaft 34 and the fourth connecting shaft 35 are symmetrically away from each other relative to the imaginary plane VF, thereby driving the third clamp 3 and the fourth clamp 4 to be symmetrically away from each other relative to the imaginary plane VF, so that the third clamp 3 and the fourth clamp 4 are converted to the aforementioned away state. After that, if the cylinder shaft of the second power member 24 is retracted, the third clamp 3 and the fourth clamp 4 are symmetrically close to each other 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.

[0125] The first axis AX1 and the second axis AX2 are also imaginary lines, and are respectively defined by rotation shafts that pass through the first movable hinge block 5 and the second movable hinge block 6 but whose reference numerals are omitted.

[0126] 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 rear fin machine can process the tube TT to obtain a heat exchange tube TT with fins, but is also used to withdraw the heat exchange tube TT from the fin machine.

[0127] In detail, the pipe threading auxiliary device 100 also includes a second shell 22 fixed to the aforementioned first shell 21, and a pair of clamping rollers and a motor 31 mounted to the second shell 22. The second shell 22 also has a substantially rectangular shape, and includes a main body portion facing the opening and a cover portion detachably fastened at the opening by bolts. In the threading direction DR1, the pair of pressure rollers is arranged on the upstream side of the aforementioned first clamping mechanism and the 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 accommodated in the second shell 22.

[0128] During the tube threading process, the tube TT is clamped by the first clamping roller 25 and the second clamping roller 26 from both sides of the radial direction with an appropriate clamping force, thereby maintaining the tube TT in a predetermined position. The tube delivery mechanism 200 (the tube delivery mechanism 200 may be a straight-line cart on a track) located on the upstream side of the clamping roller pair applies a driving force to the tube TT, thereby driving the tube TT to move along the threading direction DR1.

[0129] During the tube withdrawal process, the tube TT is clamped by the first and second clamping rollers 25 and 26 from both radial sides with appropriate clamping force, and the first and second clamping rollers 25 and 26 are driven by the motor 31 to rotate, thereby driving the tube TT to withdraw from the fin machine.

[0130] In addition, a guide sleeve 27 with a larger inner diameter is arranged between the aforementioned clamping roller pair and the first clamping mechanism to receive the tube TT from the clamping roller pair, and the inner hole wall of the guide sleeve 27 blocks and limits the outer surface of the tube TT to prevent the tube TT from deviating at a large angle during the movement toward the first clamping mechanism, so that the tube head TT1 can be successfully received by the first bell mouth 38.

[0131] Furthermore, a sensor 28 electrically connected to the first power member 23 and the second power member 24 is mounted on the guide sleeve 27. The 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 clamping mechanism and the second clamping mechanism, and is also a position on the upstream side of the first clamping mechanism and the second clamping mechanism. Exemplarily, the sensor 28 may be a photoelectric sensor 28. When the tube head TT1 moves to the position where the sensor 28 is located, the tube head TT1 blocks the corresponding light path, thereby generating a response signal in the sensor 28. The generation of the response signal may be interpreted by the sensor 28 as the tube head TT1 reaching the predetermined position.

[0132] Furthermore, the power member is configured as follows: in response to the sensor 28 detecting that the tube head TT1 reaches a predetermined position, after a delay of a preset time, the clamping mechanism switches from a clamping state to a releasing state; wherein the preset time is not less than the time taken by the tube head TT1 to move from the aforementioned predetermined position to the club head PP1 (in more detail, the distal part PP11 of the club head).

[0133] Next, please combine Figures 1 to 8 , a method for inserting a tube TT onto a core rod PP using the tube inserting auxiliary device 100 is described in more detail. The method includes the following steps S801 to S804:

[0134] S801, the tube head TT1 of the tube TT is elastically clamped by the first clamping mechanism, and the rod head PP1 of the core rod PP is clamped by the second clamping mechanism, so that the tube head TT1 and the rod head PP1 are aligned in the insertion direction DR1.

[0135] In one embodiment, first, the cylinder shafts of the cylinder serving as the first power member and the cylinder serving as the second power member 24 are both in a retracted state, whereby the first clamping block 1 and the second clamping block 2 of the first clamping mechanism are close to each other in a first initial state under the elastic force of the first spring 7 and the second spring 8, that is, the aforementioned close state, and the third clamping block 3 and the fourth clamping block 4 of the second clamping mechanism are close to each other in a second initial state under the elastic force of the third spring 9 and the fourth spring 10, and a third bell mouth 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, and 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 farther away from each other. At this time, the tube TT has not yet entered between the first clamp block 1 and the second clamp block 2, and the core rod PP has not yet entered between the third clamp block 3 and the fourth clamp block 4. The second biasing member has a tendency to maintain the third clamp block 3 and the fourth clamp block 4 in the second initial state.

[0136] Subsequently, the core rod PP is driven by the rod feeding mechanism 500 on the rear end side (i.e., the side where the fin machine is located) to move in the opposite direction of the aforementioned insertion direction DR1. The position accuracy of the rod head PP1 of the core rod PP coming from the rear end side near the second clamping mechanism is difficult to guarantee (for example, due to the shaking of the core rod PP itself, etc.), and it usually appears randomly within a certain position range. Advantageously, an outwardly expanded third bell mouth 40 is formed between the third clamp block 3 and the fourth clamp block 4 in the second initial state, and the third bell mouth 40 can easily receive the forward-moving rod head PP1 (even if the rod head PP1 may appear in a larger position range), and after receiving the rod head PP1, more specifically, the distal part PP11 of the rod head PP1, the inner wall surface of the third bell mouth 40 can guide the rod head PP1 to the straightening position between the third clamp block 3 and the fourth clamp block 4. Furthermore, when the club head PP1 contacts the third clamp block 3 and the fourth clamp block 4 and continues to move, the third clamp block 3 and the fourth clamp block 4 respectively overcome the elastic force of the third spring 9 and the fourth spring 10 due to the force of the club head PP1 and move away symmetrically relative to the imaginary plane VF, that is, the moving club head PP1 symmetrically pushes away the third clamp block 3 and the fourth clamp block 4 along the clamping direction DR2, thereby providing a space for the continued movement of the club head PP1. Furthermore, during the period when the tube head TT1 pushes away the third clamp block 3 and the fourth clamp block 4 and continues to move, since the elastic biasing force towards the second initial state applied by the second biasing member to the third clamp block 3 and the fourth clamp block 4 still exists, the club head PP1 becomes elastically clamped by the third clamp block 3 and the fourth clamp block 4. Under the action of the elastic clamping force, the club head PP1, which may have been displaced, is straightened by the third clamp block 3 and the fourth clamp block 4 that move in the center, and the center axis of the club head PP1 coincides with the imaginary straight line AX. That is, the club head PP1 is in a state of being elastically clamped by the third clamp block 3 and the fourth clamp block 4, and moves toward the club head PP1. And, the club head PP1 stops moving until the tip portion PP11 of the club head PP1 moves to a predetermined position in the second bell mouth 39 between the third clamp block 3 and the fourth clamp block 4. At this time, the third clamp block 3 and the fourth clamp block 4 or the second clamping mechanism are in the aforementioned clamping state.

[0137] In addition, the tube TT moves toward the first clamping mechanism driven by the tube feeding mechanism 200 on the front end side. When the tube head TT1 moves through the first bell mouth 38 to be elastically clamped between the first clamp block 1 and the second clamp block 2, the center axis of the tube head TT1 also coincides with the imaginary straight line AX, and the tube head TT1 is aligned with the rod head PP1 in the insertion direction DR1.

[0138] In another embodiment, the cylinder shaft of the second power member 24 can be controlled to extend so that the third clamp 3 and the fourth clamp 4 are in a released state away from each other, and a bell mouth for receiving the rod head PP1 is also formed between the third clamp 3 and the fourth clamp 4 in the released state. It can be understood that the bell mouth helps to better guide the rod head PP1 of the core rod PP moving toward the second clamping assembly to the clamping space between the third clamp 3 and the fourth clamp 4, especially when the distance between the third clamp 3 and the fourth clamp 4 (even if the two are in the released state) is not large enough. Then, after the rod head PP1 enters the clamping space between the third clamp 3 and the fourth clamp 4 through the bell mouth, the cylinder shaft of the second power member 24 is controlled to retract, and the rod head PP1 becomes elastically clamped and straightened by the third clamp 3 and the fourth clamp 4.

[0139] S802: The tube TT is moved along the insertion direction DR1 to insert the tube head TT1 onto the shaft head PP1.

[0140] When the tube head TT1 is elastically clamped by the first clamping mechanism and the club head PP1 is clamped by the second clamping mechanism, so that the tube head TT1 and the club head PP1 are aligned in the insertion direction DR1, the tube head TT1 can be easily inserted into the club head PP1 by moving the tube TT along the insertion direction DR1.

[0141] In most cases, when the tube head TT1 is in a state of being elastically clamped by the first clamp block 1 and the second clamp block 2 and moves toward the club head PP1, the coincidence of the central axis of the tube head TT1 and the aforementioned imaginary straight line AX is relatively good. Therefore, even if the aforementioned second flare 39 is not present between the third clamp block 3 and the fourth clamp block 4 in the clamped state, for example, the distal portion PP11 of the club head PP1 is Figure 1 If the tube head TT1 extends out of the left side of the third clamping block 3 and the fourth clamping block 4, the tube head TT1 can also be successfully put on the club head PP1, more specifically, the distal part PP11 of the club head PP1. Therefore, in these cases, it is also feasible to omit the second bell mouth 39.

[0142] However, such an unexpected situation may also occur: when the tube head TT1 is in a state of being elastically clamped by the first clamping block 1 and the second clamping block 2 and moves toward the club head PP1, the coincidence between the central axis of the tube head TT1 and the imaginary straight line AX is not well maintained, for example, the tube head TT1 shakes when it is very close to the tip of the club head PP1. In this case, it is advantageous to configure the second bell-mouth 39: the inner wall surface of the second bell-mouth 39 can contact the tip of the tube head TT1 before the tip part PP11 of the rod head PP1, so that the inner wall surface of the second bell-mouth 39 can be used to straighten the shaking tube head TT1 to a position precisely aligned with the tip of the rod head PP1; and in this process, the elastic bias force applied by the third spring 9 and the fourth spring 10 to the third clamp block 3 and the fourth clamp block 4 is relatively large (usually larger than the elastic bias force applied by the first spring 7 and the second spring 8 to the first clamp block 1 and the second clamp block 2), so that the tip of the tube head TT1 will not push away the third clamp block 3 and the fourth clamp block 4, and the rod head PP1 is always in a stably clamped state.

[0143] S803, control the first clamping mechanism to release the tube head TT1 to form a first passage 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 passage for the tube TT to pass through at the second clamping mechanism.

[0144] When the tube head TT1 has been inserted into the rod head PP1 and the tube TT and the core rod PP have been connected, 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 keep the third clamping block 3 and the fourth clamping block 4 in a released state, so as to reduce the resistance encountered by the tube TT in the process of continuing to insert the tube. 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.

[0145] For example, in response to the sensor 28 detecting that the tube head TT1 reaches the predetermined position, after a preset time interval, the first power member 23 drives the first clamp 1 and the second clamp 2 to switch to the away state, and the second power member 24 drives the third clamp 3 and the fourth clamp 4 to switch to the away state. The aforementioned set time can be predetermined based on the moving speed of the tube TT and the distance between the sensor 28 and the second clamping mechanism. In general, the preset time should not be less than the time taken for the tube head TT1 to move from the predetermined position to the club head PP1 (more specifically, the distal part PP11 of the club head), so as to ensure that when the third clamp 3 and the fourth clamp 4 are switched to the away state, the tube head TT1 has been put on the club head PP1. In some embodiments, the preset time is optimized so that when the second power member 24 starts to drive the third clamp 3 and the fourth clamp 4 to switch to the release state, the tube head TT1 is just inserted into the distal part PP11 of the rod head PP1, and a relatively large thrust is not applied to the third clamp 3 and the fourth clamp 4, thus helping to protect the structure of the tube TT; in other embodiments, the preset time may be set to be relatively long or the movement speed of the tube TT is unexpectedly accelerated, resulting in that before the second power member 24 drives the third clamp 3 and the fourth clamp 4 to switch to the release state, the tube head TT1 has already pushed the third clamp 3 and the fourth clamp 4 with the help of the second bell mouth 39 and moved between the third clamp 3 and the fourth clamp 4 in an elastically clamped state, thereby not affecting the smooth progress of the tube threading action. Exemplarily, the preset time may be 2 seconds.

[0146] S804 , moving the tube TT along the sleeve insertion direction DR1 via the first channel and the second channel.

[0147] In some embodiments, in order to allow the core rod PP to return to the rear end of the fin machine so that the tube TT can be supported in the fin machine to process the fins, the core rod PP can be moved along the insertion direction DR1 after the first power member 23 and the second power member 24 respectively open the first clamping mechanism and the second clamping mechanism. However, the moving speed of the core rod PP is less than the moving speed of the tube TT, thereby finally completing the insertion operation of the tube TT on the core rod PP.

[0148] Combined with the above description and see Figure 3 The embodiment of the present application further provides a pipe threading device, which includes a pipe feeding mechanism 200, a pipe support body 300, a rod feeding mechanism 500, a core rod PP support body and the above-mentioned pipe threading auxiliary device 100.

[0149] The tube support 300 supports the tube TT to be sleeved at the upstream side of the first clamping mechanism in the sleeve-inserting direction DR1. Exemplarily, the tube support 300 may be a series of support rollers arranged at intervals along the length direction of the tube TT.

[0150] The core rod PP support body supports the core rod PP at the downstream side of the second clamping mechanism in the sleeve insertion direction DR1. For example, the rod support body 400 can be a series of support rollers arranged at intervals along the length direction of the core rod PP.

[0151] The tube delivery mechanism 200 is used to drive the tube TT to move along the sleeve insertion direction DR1. For example, the tube delivery mechanism 200 may be a pusher that moves on a linear track, and the linear track extends along the length direction of the tube TT.

[0152] The rod feeding mechanism 500 can drive the core rod PP to move in the sleeve insertion direction DR1 and in the opposite direction of the sleeve insertion direction DR1. The rod feeding mechanism 500 drives the core rod PP to move in the sleeve insertion direction DR1, and sends the rod head PP1 of the core rod PP to the sleeve insertion preparation position elastically clamped by the second clamping mechanism. The rod feeding mechanism 500 drives the core rod PP to move in the opposite direction of the sleeve insertion direction DR1, and returns the core rod PP to the fin machine on the rear end side, so as to process fins that can enhance heat exchange on the tube wall in the fin machine. Exemplarily, the rod feeding mechanism 500 may include a clamping jaw that can selectively tighten and loosen the core rod PP, and a cylinder that drives the clamping jaw to reciprocate along the length direction of the core rod PP. In the process of the cylinder driving the clamping jaw to reciprocate along the length direction of the core rod PP, the clamping jaw is rhythmically tightened and loosened to selectively move the core rod PP in the sleeve insertion direction DR1 or in the opposite direction of the sleeve insertion direction DR1.

Claims

1. A clamping mechanism for clamping the rod head of a core rod for a tube to be inserted into a sleeve, characterized in that: The clamping mechanism has an initial state, a release state, and a clamping state between the initial state and the release state, and includes: Two clamping blocks, each having two clamping surfaces for clamping the rod head from two radial sides, wherein the two clamping surfaces are configured to be centrally symmetrical about an imaginary straight line; A transmission assembly, connecting the two clamping blocks; the two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly, wherein the imaginary straight line extends along the sleeve insertion direction in the imaginary plane; a biasing member for applying an elastic force to the two clamping blocks so as to elastically bias the clamping mechanism toward the initial state; In the initial state, the two clamping blocks are relatively close to each other, and a bell mouth for receiving the rod head is formed therebetween; In the clamping state, the two clamping blocks are relatively far away from each other and elastically clamp the rod head from two radial sides respectively; In the released state, the two clamps are further separated to release the rod head, and a passage is formed between the two for the tube to pass through; Wherein, when the clamping mechanism is in the initial state, the rod head, under the guidance of the bell mouth, enters between the two clamping blocks in a manner of pushing the two clamping blocks apart, thereby switching the clamping mechanism to the clamping state.

2. The clamping mechanism according to claim 1, characterized in that: The club head includes a distal portion and a non-distal portion continuous with the distal portion; In the clamping state, another bell mouth corresponding to the pipe head of the pipe is formed between the two clamping blocks, the two clamping surfaces clamp the non-distal part, and the distal part extends into the bell mouth; Wherein, the tube head is inserted onto the rod head under the guidance of the other bell mouth.

3. The clamping mechanism according to claim 1, characterized in that: The clamping surface is a concave arc surface or an elliptical arc surface.

4. A clamping mechanism, characterized in that: include: Two clamping blocks, each having two clamping surfaces for clamping the tube head of the tube from both radial sides, the two clamping surfaces being constructed to be centrally symmetrical about an imaginary straight line; the two clamping blocks have a close state, a far state, and an intermediate state between the close state and the far state; in the close state, the two clamping blocks are relatively close to each other, and a bell mouth for receiving the tube head is formed between the two; in the intermediate state, the two clamping blocks are relatively far away and the clamping surfaces are used to elastically clamp the tube head from both radial sides; in the far state, the two clamping blocks are further away from each other to release the tube head, and a passage for the tube to pass through is formed between the two; A transmission assembly, connecting the two clamping blocks; the two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly, wherein the imaginary straight line extends in the imaginary plane along the sleeve insertion direction of the rod; A biasing member applies an elastic force to the two clamping blocks, so that the two clamping blocks are elastically biased toward the close state; Wherein, when the two clamping blocks are in the close state, the rod head of the rod enters between the two clamping blocks under the guidance of the bell mouth, thereby converting the two clamping blocks to the intermediate state.

5. A pipe threading device, used to thread a pipe onto a core rod, characterized in that: include: A tube feeding mechanism, configured to drive the tube to move along a sleeve insertion direction; A clamping mechanism having a clamping state and a releasing state; In the clamping state, the clamping mechanism clamps the rod head of the core rod in such a way that the rod head of the core rod is aligned with the tube head of the tube; in the releasing state, the clamping mechanism releases the rod head and forms a passage for the tube to pass through; a power member configured to actuate the clamping mechanism so as to switch the clamping mechanism from the clamping state to the releasing state; A sensor, electrically connected to the power member, and configured to detect whether the pipe head reaches a predetermined position, wherein the predetermined position is a position near the clamping mechanism, and in the sleeve-threading direction, the predetermined position is located on the upstream side of the clamping mechanism; The power member is configured to: in response to the sensor detecting that the tube head reaches the predetermined position, after a delay of a preset time, switch the clamping mechanism from the clamping state to the releasing state; wherein the preset time is not less than the time taken by the tube head to move from the predetermined position to the rod head.

6. The pipe threading device according to claim 5, characterized in that: The pipe threading device further comprises a supporting member for mounting the clamping mechanism, wherein the clamping mechanism comprises two clamping blocks which can move relatively on the supporting member; In the clamping state, the two clamping blocks are relatively close to clamp the rod head from both radial sides, and a bell mouth for receiving the pipe head is formed between the two clamping blocks; In the release state, the two clamping blocks are relatively separated to release the rod head and form the channel between the two. Wherein, the tube head is inserted onto the rod head under the guidance of the bell mouth.

7. The pipe threading device according to claim 6, characterized in that: The club head includes a distal portion and a non-distal portion continuous with the distal portion; In the clamping state, the two clamping blocks clamp the non-tip portion, and the tip portion extends into the bell mouth.

8. The pipe threading device according to claim 6, characterized in that: In the released state, another bell mouth opposite to the bell mouth is formed between the two clamping blocks, and the rod head enters between the two clamping blocks under the guidance of the other bell mouth and is elastically clamped by the two clamping blocks.

9. The pipe threading device according to claim 7, characterized in that: The clamping mechanism also has an initial state, and compared with the clamping state, the two clamping blocks in the initial state are closer to each other; In the initial state, another bell mouth is formed between the two clamping blocks to receive the rod head; The clamping mechanism comprises: A transmission assembly, connecting the two clamping blocks; a biasing member for applying an elastic force to the two clamping blocks so as to elastically bias the clamping mechanism toward the initial state; The two clamping blocks are configured to move symmetrically relative to an imaginary plane under the constraint of the transmission assembly; The two clamping blocks respectively have two clamping surfaces for clamping the non-tip portion from two sides, and the two clamping surfaces are configured to be centrally symmetrical about an imaginary straight line, and the imaginary straight line extends along the sleeve insertion direction in the imaginary plane; When the clamping mechanism is in the initial state, the rod head, under the guidance of the other bell mouth, enters between the two clamping blocks in a manner of pushing the two clamping blocks apart, thereby switching the clamping mechanism to the clamping state.

10. The pipe threading device according to claim 9, characterized in that: The transmission assembly comprises: A movable hinge block is mounted to the support member in a manner of rotating about a rotation axis and has two guide holes, wherein the two guide holes are configured to be centrally symmetrical about the rotation axis; Two connecting shafts, respectively movably inserted into the two guide holes and respectively connected to the two clamping blocks; The power member is a cylinder that drives the movable hinge block to rotate.

11. The pipe threading device according to claim 9, characterized in that: The biasing member comprises: two springs, respectively applying elastic force to one of the two clamping blocks toward the other of the two clamping blocks; Two adjusting screw rods are respectively connected to the two springs and can be rotated to adjust the magnitude of the elastic force.

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