Pre-production device of composite heat exchange tube and working method of pre-production device

Abstract

The invention relates to the technical field of pipe blank welding, in particular to a composite heat exchange pipe pre-production device and a working method thereof.The composite heat exchange pipe pre-production device comprises a measuring assembly, a welding gun, conveying bottom wheels and a pressing side portion, and the multiple conveying bottom wheels are arranged in a row and used for driving a straight seam pipe blank to axially move; the measuring assembly and the welding gun are both arranged on the upper side of the conveying bottom wheel, and the pressing side parts are symmetrically arranged on the two sides of the straight seam pipe blank. The measuring assembly is used for measuring the outer diameter of the straight seam pipe blank and feeding back the outer diameter to the pressing side parts, and the pair of pressing side parts adjust the distance till the pressing side parts are clamped on the two sides of the straight seam pipe blank. And the welding gun is used for welding a welding straight seam of the clamped straight seam pipe blank, a guide wheel is arranged on the upper side of the conveying bottom wheel, a separation ring piece is arranged on the middle side of the guide wheel, and the separation ring piece is clamped and inserted into the welding straight seam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe welding, in particular to a pre-production device of composite heat exchange pipe and a working method thereof. BACKGROUND

[0002] The composite heat exchange pipe is a new product with strong corrosion resistance, high thermal conductivity and low price, which combines the advantages of high strength of metal pipe and good corrosion resistance of non-metal pipe. The composite material is coated on the outer surface of the steel pipe through a hollow spiral extruder. The composite material is in a molten state in the extruder, and a dense cladding layer is formed through the strong extrusion of the spiral, thereby producing a composite heat exchange pipe with a steel pipe inner layer and a composite material outer layer.

[0003] In the pre-production process of the composite heat exchange pipe, the straight seam pipe blank needs to be welded by an automatic welding machine. Argon arc automatic welding is usually used for one-time forming. In the existing straight seam welding equipment, the work personnel need to sleeve the straight seam pipe blank on the welding tool of the corresponding length, and then clamp the welding seam through the clamping blocks on both sides, and then weld along the welding seam by the welding gun. This processing method causes the length of the equipment to correspond to the length of the straight seam pipe blank. When the length of the straight seam pipe blank is much larger than the clamping tool of the equipment, the clamping and welding cannot be performed. Therefore, the longer straight seam pipe blank needs a corresponding length of clamping tool, and the longer tool will cause the equipment to occupy a large area, resulting in additional site costs.

[0004] Therefore, it is necessary to provide a pre-production device of composite heat exchange pipe and a working method thereof, which can have strong universality. SUMMARY

[0005] The present application aims to provide a pre-production device of composite heat exchange pipe and a working method thereof to solve the problems in the background art.

[0006] In order to solve the above technical problems, the present application provides the following technical scheme: a pre-production device of composite heat exchange pipe and a working method thereof, comprising a measuring assembly, a welding gun, a conveying bottom wheel and a pressing side,

[0007] The conveying bottom wheels are arranged in a row and used to drive the axial displacement of the straight seam pipe blank;

[0008] The measuring assembly and the welding gun are arranged on the upper side of the conveying bottom wheel, and the pressing side is provided with at least one pair of pressing sides, which are symmetrically arranged on both sides of the straight seam pipe blank;

[0009] The measuring assembly is used to measure the outer diameter of the straight seam pipe blank and feed back to the pressing side. The distance between the pair of pressing sides is adjusted until the straight seam pipe blank is clamped on both sides;

[0010] The welding gun is used to weld the welding straight seam of the clamped straight seam pipe blank.

[0011] In one embodiment, the upper side of the conveying bottom wheel is provided with a guide wheel, the middle side of the guide wheel is provided with a partition ring, and the partition ring is clamped into the welded straight seam.

[0012] In one embodiment, the two sides of the conveying bottom wheel are provided with support bases, the upper end of the support base is fixedly connected with a concave frame, the inner side of the concave frame is provided with a vertical slot, the vertical slot is slidably connected with a wheel frame, the guide wheel is rotatably connected in the wheel frame, the upper end of the wheel frame is fixedly connected with a threaded column, the upper end of the threaded column is fixedly connected with a cover plate, the upper end of the concave frame is rotatably connected with a rotating cover disc, and the threaded column penetrates through the rotating cover disc and is threadedly connected therewith.

[0013] In one embodiment, the pressing side includes a pair of vertical rod wheels, the two ends of the vertical rod wheel are rotatably connected with a moving plate, a pair of moving plates are fixedly connected with a concave plate, the concave plate is fixedly connected with a guide rod one, the outer side of the guide rod one is sleeved with a spring, the outer side of the guide rod one penetrates through and is slidably connected with a protective side plate, the two ends of the protective side plate are provided with an adaptive square hole, and the outer end of the guide rod one is fixedly connected with a closed cover plate.

[0014] In one embodiment, the measuring assembly includes a measuring plate, the lower end surface of the measuring plate is at the same horizontal line as the highest point of the conveying bottom wheel, the two ends of the measuring plate are fixedly connected with a sliding rail block, one end of the sliding rail block is slidably connected with a sliding rail strip, one side of the sliding rail strip is provided with a limiting vertical slot, and the outer end of the sliding rail block is fixedly connected with a limiting rod.

[0015] The outer side of the sliding rail strip is provided with an L-shaped plate, the L-shaped plate is fixedly connected with the protective side plate, the middle side of the L-shaped plate is provided with a limiting inclined slot, the limiting rod moves along the limiting vertical slot and the limiting inclined slot at the same time, one end of the sliding rail strip is fixedly connected with a pair of guide rods two, the guide rods two penetrate through the short side of the L-shaped plate and are slidably connected therewith, and one end of the L-shaped plate is fixedly connected with a stop block.

[0016] In one embodiment, the upper and lower ends of the sliding rail strip are fixedly connected with a rack one, one side of the rack one is meshingly connected with a gear one, one side of the gear one is provided with a gear two and coaxially fixed, one side of the moving plate is provided with a rack two, and the gear two and the rack two are meshingly connected with each other.

[0017] In one embodiment, the diameter of the gear one is greater than the diameter of the gear two.

[0018] The number of teeth of the gear one is equal to twice the number of teeth of the gear two.

[0019] In one embodiment, the measuring plate is provided with a grid plate.

[0020] In one embodiment, the lower end of the grid plate is provided with a roller.

[0021] Compared with the prior art, the present application has the beneficial effects that: the present application places the straight seam pipe blank to be welded at the starting end of the conveying bottom wheel by artificial, and the conveying bottom wheel is driven to rotate by the motor assembly, so as to axially transport the straight seam pipe blank into the measuring assembly; the outer diameter of the straight seam pipe blank is measured by the measuring assembly, and the measurement data is fed back to the pressing side; a pair of pressing sides are adjusted in distance according to the feedback data, so as to accurately clamp the two ends of the straight seam pipe blank, and the welded straight seam is clamped and combined; the clamped straight seam pipe blank passes through the lower end of the welding gun, the welding gun welds and fixes the clamped welded straight seam, the straight seam pipe blank completely welded is taken down by the worker, and the welding work is completed; the straight seam pipe blank is axially displaced by itself, the welding seam is clamped and combined and welded, the equipment itself occupies a fixed area, but the straight seam pipe blank with a length much longer than the equipment body can be welded, the equipment versatility is improved, and the site cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The technical solutions and other beneficial effects of the present application will be apparent from the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0023] In the drawings:

[0024] Figure 1 is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 is a schematic diagram of the front view of the present application;

[0026] Figure 3 is a schematic diagram of the guide wheel of the present application;

[0027] Figure 4 is a schematic diagram of the measuring assembly of the present application;

[0028] Figure 5 is a schematic diagram of the inside of the measuring assembly of the present application;

[0029] Figure 6 is a schematic diagram of the inside of the L-shaped plate of the present application;

[0030] Figure 7 is a schematic diagram of the grid plate of the present application;

[0031] Figure 8 is a schematic diagram of the A area of Figure 2

[0032] ​In the figure: 1, measurement assembly; 101, measurement plate; 102, sliding rail block; 103, sliding rail strip; 104, limiting rod; 105, L-shaped plate; 106, guide rod two; 107, stop block; 108, rack one; 109, gear one; 110, gear two; 111, rack two;

[0033] 2, vertical rod wheel; 201, moving plate; 202, concave plate; 203, guide rod one;

[0034] 302, grid plate; 303, roller;

[0035] 4, concave frame; 401, guide wheel; 402, separation ring piece; 403, wheel frame; 404, threaded column; 405, screw cap disc;

[0036] 5, conveying bottom wheel; 501, support base;

[0037] 7, welding gun;

[0038] 8, straight seam pipe blank;

[0039] 9, protective side plate. DETAILED DESCRIPTION

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of the specific examples in the following description are described. Of course, they are only examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0041] Please refer to Figures 1-8 The present application provides a technical solution: a pre-production device for composite heat exchange pipe and its working method, comprising a measurement assembly 1, a welding gun 7, a conveying bottom wheel 5 and a pressing side,

[0042] A number of conveying bottom wheels 5 are arranged in a row and used to drive the axial displacement of the straight seam pipe blank 8;

[0043] The measurement assembly 1 and the welding gun 7 are arranged on the upper side of the conveying bottom wheel 5, and the pressing side is provided with at least one pair, and the pair of pressing sides is symmetrically arranged on both sides of the straight seam pipe blank 8;

[0044] The measurement assembly 1 is used to measure the outer diameter of the straight seam pipe blank 8 and feedback to the pressing side, and the pair of pressing sides adjusts the interval until clamping on both sides of the straight seam pipe blank 8;

[0045] The welding gun 7 is used for welding the welded straight seam of the clamped straight seam pipe blank 8.

[0046] The straight seam pipe blank 8 to be welded is placed at the starting end of the conveying base wheel 5 by artificial, the conveying base wheel 5 is driven to rotate by a motor assembly (not shown in the figure), so as to transport the straight seam pipe blank 8 axially into the measuring assembly 1; the outer diameter of the straight seam pipe blank 8 is measured by the measuring assembly 1, and the measurement data is fed back to the pressing side; a pair of pressing sides are adjusted in distance according to the feedback data, so as to be accurately clamped at both ends of the straight seam pipe blank 8, and the welded straight seam is clamped and combined; the clamped straight seam pipe blank 8 passes through the lower end of the welding gun 7, the welding gun 7 welds and fixes the clamped welded straight seam, and the completely welded straight seam pipe blank 8 can be taken down by the worker, and the welding work is completed; the straight seam pipe blank 8 is axially displaced by itself, the clamped combination and welding of the welding seam are carried out, so that the equipment itself occupies a fixed area, but the straight seam pipe blank 8 with a length much longer than the equipment body can be welded, the universality of the equipment is improved, and the site cost is saved;

[0047] Optionally, the measuring assembly 1 includes but is not limited to a laser scanning sensor or an optical internal diameter measuring system, etc., which can all measure the diameter of the straight seam pipe blank 8. Specifically, the laser scanning sensor is used to calculate the internal diameter / external diameter of the straight seam pipe blank 8 by combining multi-point laser ranging with angle calibration, and the optical internal diameter measuring system is used to extend the measuring head of the integrated optical probe into the straight seam pipe blank 8, and obtain the internal wall 3D geometric data by rotating scanning. The above technical solutions are all prior art, and thus will not be described in detail here.

[0048] The upper side of the conveying base wheel 5 is provided with a guide wheel 401, the middle side of the guide wheel 401 is provided with a separation ring piece 402, and the separation ring piece 402 is clamped into the welded straight seam.

[0049] Preferably, the separation ring piece 402 is arranged to guide the transported straight seam pipe blank 8. Specifically, the guide wheel 401 is pressed on the upper end of the straight seam pipe blank 8, and cooperates with the conveying base wheel 5 to form clamping transportation, so as to improve the conveying stability of the straight seam pipe blank 8, and the separation ring piece 402 is clamped into the welding seam, so as to ensure that the welding seam faces upward and is aligned with the welding gun 7, and the circumferential position accuracy of the straight seam pipe blank 8 during transportation is improved.

[0050] The two sides of the conveying base wheel 5 are provided with a support base 501, the upper end of the support base 501 is fixedly connected with a concave frame 4, the inner side of the concave frame 4 is provided with a vertical groove, a wheel frame 403 is slidably connected in the vertical groove, the guide wheel 401 is rotatably connected in the wheel frame 403, the upper end of the wheel frame 403 is fixedly connected with a threaded column 404, the upper end of the threaded column 404 is fixedly connected with a cover plate, the upper end of the concave frame 4 is rotatably connected with a rotary cover disc 405, and the threaded column 404 penetrates through the rotary cover disc 405 and is threadedly connected therewith.

[0051] Preferably, when the height of the guide wheel 401 needs to be adjusted, the height is adjusted by rotating the cap disc 405, driving the threaded column 404 through the threaded connection, lifting the wheel frame 403 and the guide wheel 401, and guiding the vertical slot, so that the height can be adjusted according to the outer diameter of the straight seam pipe blank 8, and the universality is high.

[0052] The pressing side comprises a pair of vertical rod wheels 2, the two ends of the vertical rod wheel 2 are rotatably connected with a moving plate 201, a pair of moving plates 201 are fixedly connected with a concave plate 202, the concave plate 202 is fixedly connected with a guide rod one 203, the outer side of the guide rod one 203 is sleeved with a spring, the outer side of the guide rod one 203 penetrates and is slidably connected with a protective side plate 9, the two ends of the protective side plate 9 are provided with an adaptive square opening, and the outer end of the guide rod one 203 is fixedly connected with a closed cover plate.

[0053] Preferably, compared with the traditional pipe seam welding equipment, the straight seam pipe blank 8 is relatively moved for welding while the equipment itself remains unchanged, so that in order to avoid that the straight seam pipe blank 8 cannot be axially displaced while the traditional clamp block tool is clamped and combined at the butt weld, the vertical rod wheel 2 is arranged, the two vertical rod wheels 2 are combined and contacted with each other under the elastic force of the springs on the two sides in the initial state, the two vertical rod wheels 2 are relatively separated by the moving plate 201 according to the feedback of the outer diameter of the straight seam pipe blank 8, so as to accommodate the straight seam pipe blank 8 to enter, then the two vertical rod wheels 2 are relatively clamped at the two ends of the straight seam pipe blank 8 under the reset action of the spring, and then the welds are combined, the vertical rod wheel 2 is relatively rolled while keeping the state of clamping the straight seam pipe blank 8, so that the straight seam pipe blank 8 is continuously fed in the state of keeping the welds combined, and the welding is completed, and the straight seam pipe blank 8 with different outer diameters can be clamped and fed, and the universality is high.

[0054] The measuring assembly 1 comprises a measuring plate 101, the lower end surface of the measuring plate 101 is on the same horizontal line as the highest point of the conveying bottom wheel 5, the two ends of the measuring plate 101 are fixedly connected with a sliding rail block 102, one end of the sliding rail block 102 is slidably connected with a sliding rail strip 103, one side of the sliding rail strip 103 is provided with a limiting vertical slot, and the outer end of the sliding rail block 102 is fixedly connected with a limiting rod 104.

[0055] The outer side of the sliding rail strip 103 is provided with an L-shaped plate 105, the L-shaped plate 105 is fixedly connected with the protective side plate 9, the middle side of the L-shaped plate 105 is provided with a limiting inclined slot, the limiting rod 104 moves along the limiting vertical slot and the limiting inclined slot at the same time, one end of the sliding rail strip 103 is fixedly connected with a pair of guide rods two 106, the guide rods two 106 penetrate the short side of the L-shaped plate 105 and are slidably connected therewith, and one end of the L-shaped plate 105 is fixedly connected with a stop block 107.

[0056] Although the sensors based on laser scanning and optical internal diameter measurement can achieve the measurement and feedback of the straight-seam pipe blank 8, there are indeed some disadvantages and limitations that cannot be ignored in actual industrial production applications, such as high cost, high-precision laser sensors (such as ZLDS100 / ZLDS103 series) or complex optical internal diameter measurement systems (such as ZID100 / AAHI20) have high initial purchase cost, and are susceptible to environmental light interference. Strong environmental light can interfere with the receiving signal of the laser sensor, affecting the measurement accuracy. Therefore, it is necessary to produce in a specific light environment, and the dust, oil mist, steam, condensate and the like commonly seen in the production site will pollute the sensor lens or optical window, reduce the measurement accuracy or block the signal, thus causing additional protection cost.

[0057] Therefore, according to the above, the present application provides an embodiment from a purely mechanical point of view, which realizes stable outer diameter measurement and feedback action in the welding production of the straight-seam pipe blank 8. Optionally, in the initial state, the lower end surface of the measurement plate 101 is on the same horizontal line as the highest point of the conveying bottom wheel 5. The straight-seam pipe blank 8 is pushed by the conveying bottom wheel 5 to make its head end contact with the measurement plate 101. The two ends of the measurement plate 101 are provided with limit rods 104, so that the measurement plate 101 displaces along the limit inclined chute. The measurement plate 101 displaces upward along the limit inclined chute while displacing backward under the pushing of the straight-seam pipe blank 8, until the upward displacement distance is equal to the outer diameter of the straight-seam pipe blank 8. The straight-seam pipe blank 8 can pass through the measurement plate 101. Since the lowermost end of the straight-seam pipe blank 8 is at the highest point of the conveying bottom wheel 5, the measurement plate 101 displaces upward from the highest point of the conveying bottom wheel 5 as the starting point. The vertical rising distance is the outer diameter of the straight-seam pipe blank 8. The straight-seam pipe blank 8 with different outer diameters can be measured, and the outer diameter of the straight-seam pipe blank 8 can be accurately measured. The structure is simple and has strong practicality.

[0058] Preferably, the slide rail block 102 is provided to vertically displace for guidance, and the guide rod two 106 is provided to horizontally displace for guidance, so as to ensure the stability of the measurement plate 101 itself when it displaces obliquely.

[0059] The upper and lower ends of the slide rail strip 103 are fixedly connected with a rack one 108. One side of the rack one 108 is meshingly connected with a gear one 109. One side of the gear one 109 is provided with a gear two 110 and coaxially fixed with the gear two 110. One side of the moving plate 201 is provided with a rack two 111. The gear two 110 and the rack two 111 are meshed with each other.

[0060] Preferably, after the measuring plate 101 measures the outer diameter of the straight seam pipe blank 8, it is necessary to accurately feed it back to the vertical rod wheel 2, so that a pair of vertical rod wheels 2 are relatively displaced to develop a suitable interval, and the straight seam pipe blank 8 is welded and clamped together. Specifically, the straight seam pipe blank 8 drives the measuring plate 101 to displace, drives the sliding rail strip 103 and the rack one 108 to horizontally displace, drives the gear one 109 and the gear two 110 to rotate through gear meshing transmission, and the gear two 110 drives the rack two 111 to displace, so that a pair of merged vertical rod wheels 2 are separated from each other, so that the straight seam pipe blank 8 enters, and the vertical rod wheel 2 clamps and transports it. That is, through the axial transportation of the straight seam pipe blank 8, the automatic opening and closing control of the vertical rod wheel 2 is realized, the interval is adjusted to clamp the straight seam pipe blank 8, the automatic merging of the weld is realized, and the subsequent welding is facilitated.

[0061] The diameter of the gear one 109 is greater than the diameter of the gear two 110.

[0062] The number of teeth of the gear one 109 is equal to twice the number of teeth of the gear two 110.

[0063] Preferably, according to the above embodiment, the outer diameter size fed back by the measuring plate 101 is needed to accurately control the distance of a pair of vertical rod wheels 2 to develop, in order to improve the accuracy of the feedback action and avoid that the vertical rod wheel 2 develops too large to effectively clamp the weld. The limit inclined groove is set to be 45 degrees inclined, so that when the measuring plate 101 is obliquely displaced, the horizontal displacement distance is equal to the vertical displacement distance, both of which are the outer diameter size of the current straight seam pipe blank 8, and the diameter of the gear one 109 is greater than the diameter of the gear two 110, and the number of teeth Z of the gear one 109 is equal to twice the number of teeth z of the gear two 110. When the measuring plate 101 moves horizontally or vertically by a distance S, the rotation angle calculation formula of the gear one 109 is:

[0064]

[0065] Since the gear two 110 is coaxially arranged with the gear one 109, the same angle θ is rotated, and the one-side vertical rod wheel 2 moves a distance s:

[0066]

[0067] Substituting the above θ, the final displacement relationship is:

[0068]

[0069] Therefore, it is concluded that the displacement distance of the one-side vertical rod wheel 2 is half of the displacement of the measuring plate 101, that is, the distance of a pair of vertical rod wheels 2 relatively separated is just equal to the outer diameter of the straight seam pipe blank 8, so that the data measured by the measuring plate 101 can be accurately fed back and control the vertical rod wheel 2 to clamp.

[0070] The grid plate 302 is arranged in the measuring plate 101.

[0071] The lower end of the grid plate 302 is provided with a roller 303.

[0072] Preferably, in order to reduce the friction force between the measuring plate 101 and the straight seam pipe blank 8, the grid plate 302 is arranged, specifically, the head end of the straight seam pipe blank 8 is in contact with the grid plate 302, a plurality of vertical grooves are arranged to reduce the contact area with the head end surface of the straight seam pipe blank 8, reduce the friction force therebetween, and the roller 303 is arranged, so that when the grid plate 302 is pressed on the upper side of the transported straight seam pipe blank 8, the friction force therebetween is reduced.

[0073] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected, or can be in communication with each other; can be directly connected, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] The above describes in detail the pre-production device of the composite heat exchange pipe and the working method thereof provided by the embodiments of the present application. In this paper, specific examples are applied to explain the principles and implementation modes of the present application. The above embodiment is only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pre-production device of composite heat exchange tube, comprising a measuring assembly (1), a welding gun (7), a conveying base wheel (5) and a pressing side, characterized in that: a plurality of conveying base wheels (5) are arranged in a row and used to drive the axial displacement of a straight seam tube blank (8); the measuring assembly (1) and the welding gun (7) are arranged on the upper side of the conveying base wheel (5), and at least one pair of pressing sides is arranged symmetrically on both sides of the straight seam tube blank (8); the measuring assembly (1) is used to measure the outer diameter of the straight seam tube blank (8) and feed back to the pressing side, and a pair of pressing sides adjusts the interval until clamping on both sides of the straight seam tube blank (8); the welding gun (7) is used to weld the welding straight seam of the clamped straight seam tube blank (8); the upper side of the conveying base wheel (5) is provided with a guide wheel (401), the middle side of the guide wheel (401) is provided with a partition ring (402), and the partition ring (402) is clamped into the welding straight seam; the both sides of the conveying base wheel (5) are provided with a supporting base (501), the upper end of the supporting base (501) is fixedly connected with a concave frame (4), the inner side of the concave frame (4) is provided with a vertical groove, the vertical groove is slidably connected with a wheel frame (403), the guide wheel (401) is rotatably connected in the wheel frame (403), the upper end of the wheel frame (403) is fixedly connected with a threaded column (404), the upper end of the threaded column (404) is fixedly connected with a cover plate, the upper end of the concave frame (4) is rotatably connected with a rotating cover disc (405), the threaded column (404) penetrates through the rotating cover disc (405) and is threadedly connected therewith. The pressing side comprises a pair of vertical rod wheels (2), both ends of the vertical rod wheel (2) are rotatably connected with a moving plate (201), a pair of moving plates (201) are fixedly connected with a concave plate (202), the concave plate (202) is fixedly connected with a guide rod one (203) inside, the outer side of the guide rod one (203) is sleeved with a spring, the outer side of the guide rod one (203) penetrates and slidably connects with a protective side plate (9), both ends of the protective side plate (9) are provided with an adaptive square opening, and the outer end of the guide rod one (203) is fixedly connected with a closed cover plate. The measuring assembly (1) comprises a measuring plate (101), the lower end surface of the measuring plate (101) is on the same horizontal line as the highest point of the conveying base wheel (5), both ends of the measuring plate (101) are fixedly connected with a sliding rail block (102), one end of the sliding rail block (102) is slidably connected with a sliding rail strip (103), one side of the sliding rail strip (103) is provided with a limiting vertical groove, and the outer end of the sliding rail block (102) is fixedly connected with a limiting rod (104). ​ ​ 2. The pre-production device of a composite heat exchange tube according to claim 1, characterized in that: ​ 3. The pre-production device of a composite heat exchange tube according to claim 2, characterized in that: ​ 4. The pre-production device of a composite heat exchange tube according to claim 1, characterized in that: ​ 5. The pre-production device of a composite heat exchange tube according to claim 4, characterized in that: ​ The outer side of the slide rail strip (103) is provided with an L-shaped plate (105), which is fixedly connected with the protective side plate (9), the middle side of the L-shaped plate (105) is provided with a limiting inclined groove, the limiting rod (104) moves along the limiting vertical groove and the limiting inclined groove at the same time, one end of the slide rail strip (103) is fixedly connected with a pair of guide rods two (106), the guide rods two (106) penetrate through the short side of the L-shaped plate (105) and are in sliding fit with the same, and one end of the L-shaped plate (105) is fixedly connected with a stop block (107).

6. The pre-production device of a composite heat exchange tube according to claim 5, characterized in that: The upper and lower ends of the slide rail strip (103) are fixedly connected with a rack one (108), one side of the rack one (108) is meshedly connected with a gear one (109), one side of the gear one (109) is provided with a gear two (110) and both are coaxially fixed, one side of the moving plate (201) is provided with a rack two (111), and the gear two (110) and the rack two (111) are in meshing with each other.

7. The pre-production device of a composite heat exchange tube according to claim 6, characterized in that: The diameter of the gear one (109) is greater than that of the gear two (110). The number of teeth of the gear one (109) is equal to twice the number of teeth of the gear two (110).

8. The pre-production device of a composite heat exchange tube according to claim 5, characterized in that: The measuring plate (101) is provided with a grid plate (302) therein.

9. The pre-production device of a composite heat exchange tube according to claim 5, characterized in that: The lower end of the grid plate (302) is provided with a roller (303).

10. A working method of a pre-production device of a composite heat exchange tube according to claim 1, characterized in that The method comprises the following steps: S1, the straight seam pipe blank (8) to be welded is placed at the starting end of the conveying bottom wheel (5) by manual operation, and the conveying bottom wheel (5) transports the straight seam pipe blank (8) into the measuring assembly (1); S2, the diameter of the straight seam pipe blank (8) is measured by the measuring assembly (1), and the measurement data is fed back to the pressing side; S3, the pair of pressing sides adjusts the distance according to the feedback data, so as to clamp the two ends of the straight seam pipe blank (8) and clamp the straight seam to be welded; S4, the clamped straight seam pipe blank (8) passes through the lower end of the welding gun (7), and the welding gun (7) welds and fixes the clamped straight seam.

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