Lightweight and efficient combined pipe expander

Abstract

This utility model relates to the field of tube expander technology, and in particular to a lightweight and efficient combined tube expander. It includes: a frame assembly; a worktable assembly for supporting and limiting the workpiece while slidingly mounted on the frame assembly; a tailstock clamping assembly for limiting the end of the workpiece away from the expansion head assembly; a jaw assembly and a tube expander assembly, both mounted on the frame assembly. The jaw assembly clamps and fixes the copper tube of the workpiece to cooperate with the tube expander assembly in expanding the copper tube. The number of rows of jaws and expansion heads in the tube expander assembly is consistent with the number of rows of workpieces. The sliding direction of the worktable assembly is perpendicular to the tube expander direction of the workpiece. The jaw assembly and the tube expander assembly are slidably mounted on the frame assembly, and their sliding direction is perpendicular to the sliding direction of the worktable assembly. This invention solves the technical problems commonly found in existing combined tube expanders, such as large equipment weight, poor consistency of expansion rate, and poor stability of expansion quality due to rigidity and strength requirements.

Description

Technical Field

[0001] This utility model relates to the field of tube expander technology, and in particular to a lightweight and efficient combined tube expander. Background Technology

[0002] Heat exchangers are commonly used in air conditioning and refrigeration industries. They mainly consist of fins and copper tubes. After installation, there are gaps between the copper tubes and the inner holes of the heat exchanger fins. The copper tubes need to be expanded to achieve an interference fit and tight contact with the heat exchanger fins, resulting in better heat dissipation and increased structural strength. A tube expander is an automated, multi-functional industrial device primarily used in the connection process between tube sheets and heat exchanger tubes during heat exchanger manufacturing. It uses mechanical or hydraulic methods to evenly expand the heat exchanger tubes into the tube holes of the tube sheet, forming a strong, sealed connection. Conventional tube expanders include integral tube expanders and combined tube expanders. Integral tube expanders expand tubes in one pass, offering high efficiency. However, to ensure tube expansion quality and equipment strength, the base is heavy, resulting in high cost—sometimes several million dollars per unit. Combined tube expanders, on the other hand, use multiple expansion stages, significantly reducing the number of expansion devices. Furthermore, the reduced number of tubes expanded at one time significantly lowers the strength requirements of the base, resulting in a substantial reduction in equipment weight and facilitating assembly and transportation.

[0003] A horizontal tube expander is disclosed in the prior art, according to a utility model patent with publication number CN217121514U. It discloses a machine frame, a worktable, an expanding device, and a positioning device. The worktable is used to place the workpiece and is mounted on the machine frame. The expanding device is mounted on the machine frame and includes an expanding component that can extend into the tube of the workpiece for expanding. A fixing device is mounted on the machine frame and moves towards the expanding device to adjust the fixed position of the workpiece. The positioning device includes a first positioning component on both sides of the worktable and a second positioning component above the worktable. The first positioning component positions the workpiece along the X-axis, and the second positioning component positions the workpiece along the Y-axis, so that the tube opening of the workpiece corresponds to the position of the expanding component on the expanding device. However, related technologies, including the above-mentioned technical solutions, still have many problems, such as: ① Conventional combined tube expanders generally use a method of first fixing the workpiece... The expansion device is then moved to achieve batch expansion of the same workpiece. Depending on the requirements, the expansion head needs to move along the XYZ axes, each requiring a power assembly. The expansion machine is quite heavy, generating significant inertial force during high-speed positioning and start-up, leading to vibration, overshoot, and positioning errors. These problems indirectly affect the consistency of the expansion rate. Therefore, the existing combined expansion machines still suffer from inconsistent expansion rates due to their heavy weight. Secondly, conventional combined expansion machines expand tubes row by row. Each expansion of the copper tube generates a tightening force on the heat exchanger tube sheet, causing indirect deformation. Expanding tubes row by row results in increasingly smaller shrinkage in the mounting holes of the remaining copper tubes, leading to accumulated deformation and residual stress, resulting in poor consistency in the expansion rate of the tube ends and affecting the expansion quality. Utility Model Content

[0004] The purpose of this utility model is to provide a lightweight and efficient combined tube expander to solve the technical problems of existing combined tube expanders, such as large equipment weight, poor expansion rate consistency, and poor expansion quality stability, which are caused by the need to meet rigidity and strength requirements.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lightweight and efficient combined tube expander includes:

[0007] Rack components;

[0008] The worktable assembly is used to support and limit the workpiece while slidingly mounted on the frame assembly;

[0009] The tailstock clamping assembly is used to limit the end of the workpiece away from the expansion head assembly;

[0010] Both the gripper assembly and the tube expansion assembly are mounted on the frame assembly. The gripper assembly is used to clamp and fix the copper tube of the workpiece in order to cooperate with the tube expansion assembly to expand the copper tube. The number of rows of grippers and expansion heads of the tube expansion assembly is the same as the number of rows of workpieces.

[0011] The sliding direction of the worktable assembly is perpendicular to the expansion direction of the workpiece, and the gripper assembly and the expansion assembly are slidably mounted on the frame assembly with their sliding direction perpendicular to the sliding direction of the worktable assembly.

[0012] Furthermore, the rack assembly includes:

[0013] Main beam;

[0014] The longitudinal beam assembly, which spans across the main crossbeam, has its bottom at the same level as the bottom of the main crossbeam. The longitudinal beam assembly is configured as an H-shaped structure and is used for sliding installation of the workbench assembly.

[0015] The upper door panel assembly is installed above the main crossbeam to support the upper door panel frame, which is used to install the upper pressure assembly, which is used to limit the top of the workpiece to be expanded.

[0016] The sub-beam is mounted above the main beam via several support columns at its bottom and is used for sliding installation of the gripper assembly and the expansion tube assembly.

[0017] Furthermore, the longitudinal beam assembly includes:

[0018] The first longitudinal beam is installed on the ground at both ends of its bottom via adjusting columns;

[0019] The second longitudinal beam is installed on the ground at both ends of its bottom via adjusting columns;

[0020] There are at least two connecting beams, and the two ends of each connecting beam are installed perpendicularly to the ends of the first longitudinal beam and the second longitudinal beam, respectively.

[0021] The bottom center of both the first and second longitudinal beams is fixedly installed relative to the main crossbeam. The upper surfaces of both the first and second longitudinal beams are equipped with slide rails extending along their lengths. Screws for guiding the sliding of the workbench assembly are installed between the connecting crossbeams at both ends of the longitudinal beam assembly. The extension direction of the screws is consistent with the extension direction of the slide rails on the first and second longitudinal beams.

[0022] Furthermore, the upper door panel assembly includes:

[0023] There are two upper door panel uprights, and their bottoms are installed on the main crossbeam via support columns;

[0024] The upper door panel frame is installed at both ends on the top of the upper door panel column. Several upper pressing components are slidably installed on the upper door panel frame. Each upper pressing component includes a sliding support plate slidably installed on the upper door panel frame. An upper pressing power unit is installed on the sliding support plate. An upper pressing plate is installed at the power end of the upper pressing power unit. The upper pressing plate is driven by the upper pressing power unit to descend and limit the top of the workpiece.

[0025] Furthermore, the length of the main crossbeam is L and the width is W, the length of the upper door panel frame is V and the width is X, the distance between the first longitudinal beam and the second longitudinal beam is H, the length of the first longitudinal beam and the second longitudinal beam is Z, the distance between the two connecting crossbeams located at both ends of the first longitudinal beam and the second longitudinal beam is Y, the two connecting crossbeams are symmetrically arranged about the main crossbeam, and the distance of the first longitudinal beam from the far end of the main crossbeam is M, wherein: L = (1.85~1.95)V, V = (1.5~1.7)H, H = (2.5~4.5)M, Z = (1.25~1.45)Y = (5.5~7.5)X = (14.5~16.5)T, L = (36.5~38.5)T.

[0026] Furthermore, the workbench assembly includes:

[0027] Workbench frame;

[0028] The workbench crossbeam is set along the length of the workbench frame and is located in the middle of the workbench frame;

[0029] The tailstock screw is set parallel to the workbench beam along the length of the workbench frame and is rotatably mounted on the workbench frame at both ends.

[0030] The workpiece positioning plate comprises several plates that extend along the width of the worktable frame, with both ends of each plate mounted on the worktable frame for limiting the position of the workpiece.

[0031] Furthermore, the workpiece positioning plate includes:

[0032] plate body;

[0033] Side baffles are vertically installed on both sides of the upper surface of the plate to block and limit the workpiece from both sides.

[0034] Side columns, located on both sides of the lower surface of the plate, are used to mount the plate on both sides of the workbench frame;

[0035] The plate is provided with several sets of positioning holes, which are used for the detachable installation of one side baffle.

[0036] Furthermore, two parallel reinforcing plates are installed on the lower surface of the plate. The reinforcing plates are located between two rows of positioning holes and the center distance between the two rows of positioning holes is K. The width of the plate is Q and the length of the plate is P, where Q = (2~3)K and P = (10~11)Q.

[0037] Furthermore, the tailstock clamping assembly is slidably mounted on the frame assembly along the expansion tube direction or on the worktable assembly along the expansion tube direction.

[0038] Furthermore, the tailstock clamping assembly includes:

[0039] The bracket body is slidably mounted on the upper door panel frame;

[0040] U-shaped tube clamps, in the same number as the expansion heads, are used to limit and fix the U-shaped tubes to be expanded. The U-shaped tube clamps are regularly arranged and installed on the support body, and the support body is provided with a clamping drive unit. The clamping drive unit is used to drive the clamping claws to clamp and release the U-shaped tubes.

[0041] Furthermore, the tailstock clamping assembly includes:

[0042] The support body is slidably mounted on the workbench frame;

[0043] U-tube clamps include several sets of different models to accommodate U-shaped tubes with different arrangement rules, and the number of U-shaped tubes in the clamps is the same as the number of U-shaped tubes to be expanded.

[0044] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0045] (1). This utility model, by setting up the workbench assembly and the tube expansion assembly in cooperation, abandons the workpiece fixing commonly used in traditional combined tube expansion machines. The tube expansion assembly is moved in three axes to realize the tube expansion operation of the workpiece in a row. Because conventional three-axis movement requires three sets of power drive components, the tube expansion machine is heavy and costly. When the high-speed positioning starts and stops, huge inertial forces are generated, resulting in vibration, overshoot and positioning errors, which leads to poor consistency of the expansion rate of the equipment. However, this application limits the action mode of the tube expansion assembly and only adopts a one-axis movement structure. At the same time, the structure of the workbench assembly is set to realize the tube expansion operation by moving the workpiece in cooperation with the tube expansion assembly when expanding tubes in stages. The movement setting of the workbench assembly also has multiple functions such as workpiece loading, step-by-step tube expansion workpiece displacement, and reducing the complex three-axis structure of the tube expansion assembly. This greatly reduces the overall weight of the equipment, improves the tube expansion efficiency of the equipment, and effectively ensures the consistency of the expansion rate.

[0046] (2). This utility model adopts a partitioned method when expanding the tubes in the tube expansion assembly, which is different from the conventional row expansion method. The conventional row expansion method is prone to geometric and dimensional deformation of adjacent unexpanded holes when expanding a certain row of tubes. This leads to the accumulation of residual stress in the tube sheet during subsequent expansion operations, resulting in different output results for the same input pressure. Specifically, this manifests as inconsistency in the expansion rate. However, this application sets the number of rows of expansion heads of the tube expansion assembly to be consistent with the number of rows of copper tubes in the workpiece, changing the row expansion to partition expansion. This reduces the probability of residual stress accumulation and the degree of tube sheet deformation. At the same time, by limiting the structure of the frame assembly, the structure of the worktable assembly, and the dimensional relationship of each assembly, the loading and unloading efficiency is improved. The force flow transmission path is short and direct, the structural efficiency is high, and the required rigidity is achieved with less material. This achieves a balance between lightweight and high rigidity while ensuring the consistency of the expansion rate. Attached Figure Description

[0047] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model;

[0048] Figure 2 This is a three-dimensional structural diagram of the frame assembly in Embodiment 1 of this utility model;

[0049] Figure 3 This is a schematic diagram of the main structure of the rack assembly in Embodiment 1 of this utility model;

[0050] Figure 4 This is a top view of the frame assembly of Embodiment 1 of this utility model;

[0051] Figure 5 This is a three-dimensional structural diagram of the workbench assembly and tailstock clamping assembly in Embodiment 1 of this utility model;

[0052] Figure 6 This is a bottom view of the workbench assembly and tailstock clamping assembly of Embodiment 1 of this utility model;

[0053] Figure 7 This is a three-dimensional structural diagram of the workbench assembly in Embodiment 1 of this utility model;

[0054] Figure 8 This is a top view of the workpiece positioning plate in Embodiment 1 of this utility model.

[0055] Figure 9 This is a bottom view of the workpiece positioning plate in Embodiment 1 of this utility model;

[0056] Figure 10 This is a three-dimensional structural diagram of the workpiece positioning plate in Embodiment 1 of this utility model;

[0057] Figure 11 This is a three-dimensional structural diagram of the tailstock clamping assembly of Embodiment 1 of this utility model;

[0058] Figure 12 This is a schematic diagram of the main structure of Embodiment 2 of this utility model;

[0059] Figure 13 This is a three-dimensional structural diagram of the tailstock clamping assembly from the rear angle in Embodiment 2 of this utility model;

[0060] Figure 14 This is a three-dimensional structural diagram of the front angle of the tailstock clamping assembly in Embodiment 2 of this utility model.

[0061] In the diagram: 100. Frame assembly; 101. First longitudinal beam; 102. Connecting crossbeam; 103. Second longitudinal beam; 104. Main crossbeam; 105. Upper pressure plate; 106. Upper door panel frame; 107. Sub-crossbeam; 108. Upper door panel upright; 109. Support column; 200. Workbench assembly; 201. Workbench frame; 202. Workbench crossbeam; 203. Tailstock screw; 204. Workbench slider. ; 205. Worktable sliding nut; 206. Workpiece positioning plate; 2061. Plate body; 2062. Side baffle; 2063. Side column; 2064. Positioning hole; 2065. Reinforcing plate; 300. Tailstock clamping assembly; 301. Support body; 302. U-tube clamp; 303. Tailstock nut; 304. Clamping drive unit; 400. Workpiece; 500. Gripper assembly; 600. Tube expansion assembly. Detailed Implementation

[0062] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0063] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0064] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0065] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0066] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0068] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0069] This utility model discloses a lightweight and efficient combined tube expander, mainly addressing some common technical problems in existing technologies. These problems include: high weight and cost, and poor consistency in expansion rate affecting tube expansion quality. The high weight indirectly leads to high cost, with a single unit costing millions, which is prohibitively expensive for users. Furthermore, the excessively heavy components have significant inertia during movement, generating enormous inertial forces during high-positioning start-stop operations. The servo system struggles to quickly suppress these large inertial vibrations, causing slight vibrations in the moving parts, overshoot, and positioning errors, thus affecting the consistency of the expansion rate. Additionally, the large size and weight of the equipment generate heat during movement. The large mass also results in high thermal inertia, leading to slow heating and cooling. Therefore, the equipment requires a longer preheating time to reach stability. Poor thermal stability also contributes to poor consistency in the expansion rate.

[0070] Example 1

[0071] See appendix Figure 1A lightweight and efficient combined tube expander includes: a frame assembly 100, which serves as the base of the entire device to support other components; a worktable assembly 200, which supports and limits the workpiece 400 and is slidably mounted on the frame assembly 100. This slidable mounting is a key technical feature distinguishing this invention from existing technologies, as it facilitates the loading and unloading of the workpiece 400 and allows for the movement of the workpiece 400 to different positions during step-by-step tube expansion, thereby cooperating with the tube expander assembly 600 to complete the tube expansion operation; and a tailstock clamping assembly 300, which is used to clamp the workpiece 400... The end furthest from the expansion head assembly is used for limiting the movement. Here, the tailstock clamping assembly 300 primarily bears the impact force of the tube expansion assembly 600 when expanding the workpiece 400. Both the gripper assembly 500 and the tube expansion assembly 600 are mounted on the frame assembly 100. The gripper assembly 500 is used to clamp and fix the copper tube of the workpiece 400 to cooperate with the tube expansion assembly 600 in expanding the copper tube. It is understood that the specific structure and working principle of the gripper assembly 500 and the tube expansion assembly 600 are conventional techniques in this field and will not be elaborated upon here. Further details are omitted; the number of rows of jaws and expansion heads in the expansion assembly 600 is the same as the number of rows of workpiece 400. The innovation here, differing from existing technologies, is that the workpiece 400 is expanded in stages by dividing it into sections. That is, each expansion operation applies expansion to a portion of all rows, rather than expanding each row of copper tubes individually as in existing technologies. This application, by employing regional expansion, effectively avoids the problems of easy deformation and residual stress accumulation that easily occur in row-by-row expansion in existing technologies, thereby ensuring… The expansion ratio is consistent; the sliding direction of the worktable assembly 200 is perpendicular to the expansion direction of the workpiece 400, and the gripper assembly 500 and the expansion assembly 600 are slidably mounted on the frame assembly 100 and their sliding direction is perpendicular to the sliding direction of the worktable assembly 200. It can be understood that the sliding direction of the workpiece 400 is perpendicular to the expansion direction. On the one hand, it can complete the loading and unloading, and on the other hand, the movement of the workpiece 400 and the movement of the expansion assembly 600 can be completed synchronously, which helps to speed up the working cycle of the expansion machine and improve the working efficiency.

[0072] See appendix Figure 2-4The frame assembly 100 includes: a main crossbeam 104, which is the fundamental load-bearing beam running through the entire tube expander, and adopts a square tube structure, serving as the final bearer and transmitter of all loads; a longitudinal beam assembly, which spans the main crossbeam 104, and its bottom is located on the same horizontal plane as the bottom of the main crossbeam 104. Here, "bottom" refers to the lowest point of the component, and "same horizontal plane" refers to the ground or a platform used to store and install the entire tube expander. The longitudinal beam assembly is set with an H-shaped structure and is used for sliding installation of the workbench assembly 200; an upper door panel assembly, which is installed above the main crossbeam 104 to support and install the upper door panel frame 106. The upper door panel frame 106 is used to install the upper pressure assembly, which is used to limit the top of the workpiece 400 to be expanded; and a sub-crossbeam 107, whose bottom is installed above the main crossbeam 104 through several support columns 109 and is used for sliding installation of the gripper assembly 500 and the tube expander assembly 600. It can be understood here that the main crossbeam 104, as the main load-bearing component, has a very large moment of inertia in the vertical direction, which can effectively resist the bending deformation caused by all the loads above, thus helping to ensure the rigidity of the overall equipment. At the same time, combined with the H-shaped longitudinal beam assembly, it provides the maximum bending rigidity and strength with the least amount of material. Meanwhile, the workpiece 400 is subjected to a distributed load on the H-shaped longitudinal beam assembly, and then the force is concentrated and transferred to the main crossbeam 104 below it, thereby efficiently transferring the load, preventing the equipment from bending and deforming, and thus ensuring the consistency of the expansion joint rate.

[0073] Specifically, refer to the appendix Figure 2The longitudinal beam assembly includes: a first longitudinal beam 101, whose bottom ends are mounted on the ground via adjusting columns; a second longitudinal beam 103, whose bottom ends are mounted on the ground via adjusting columns. It is understood that the adjusting columns are used to adjust the height of the first and second longitudinal beams 101 and 103 from the ground, thereby ensuring the flatness requirements of the upper surface of the longitudinal beam assembly, and thus ensuring the flatness requirements of the workpiece 400; and connecting crossbeams 102, of which at least two are provided (this application provides two), respectively located near the ends of the first and second longitudinal beams 101 and 103. The ends of each connecting crossbeam 102 are perpendicularly mounted to the ends of the first and second longitudinal beams 101 and 103, respectively. It is understood that the purpose of the connecting crossbeams 102 is to connect the first and second longitudinal beams 101 and 103, while simultaneously improving the strength and rigidity of the longitudinal beam assembly. The bottom center of the first longitudinal beam 101 and the second longitudinal beam 103 are both fixedly installed relative to the main crossbeam 104. The upper surfaces of the first longitudinal beam 101 and the second longitudinal beam 103 are each equipped with slide rails extending along their length. A screw for guiding the sliding of the workbench assembly 200 is installed between the connecting crossbeams 102 at both ends of the longitudinal beam assembly. The extension direction of the screw is consistent with the extension direction of the slide rails on the first longitudinal beam 101 and the second longitudinal beam 103. It can be understood that the slide rails on the upper surfaces of the first longitudinal beam 101 and the second longitudinal beam 103 are intended to provide sliding guidance for the workbench assembly 200. At the same time, the screws are used to enable the workbench assembly 200 to slide along the first longitudinal beam 101 and the second longitudinal beam 103. It should be noted that the installation of the slide rails and screws can further enhance the overall strength and rigidity of the frame assembly 100, which has multiple beneficial effects.

[0074] Specifically, see Appendix Figure 2 The upper door panel assembly includes: upper door panel uprights 108, which comprises two sets, located on both sides of the longitudinal beam assembly, with two uprights in each set and mounted on the main crossbeam 104 via support columns 109 at their bottom; and an upper door panel frame 106, with both ends mounted on the top of the upper door panel uprights 108. Several upper pressing components are slidably mounted on the upper door panel frame 106. Each upper pressing component includes a sliding support plate slidably mounted on the upper door panel frame 106, with an upper pressing power unit mounted on the sliding support plate. An upper pressing plate 105 is mounted on the power end of the upper pressing power unit. The upper pressing plate 105 is driven by the upper pressing power unit to descend and limit the top of the workpiece 400. It can be understood that the bottom of the sliding support plate slides on the upper door panel frame 106 through a combination of slide rails and sliders. The upper pressing power unit can be either a cylinder or a motor. The sliding installation of the sliding support plate can achieve adjustment of different positions, thus making it suitable for workpieces 400 of different lengths.

[0075] Specifically, see Appendix Figure 3 and 4The length of the main beam 104 is L and the width is W. The length of the upper door panel frame 106 is V and the width is X. The distance between the first longitudinal beam 101 and the second longitudinal beam 103 is H. The length of the first longitudinal beam 101 and the second longitudinal beam 103 is Z. The distance between the two connecting beams 102 located at both ends of the first longitudinal beam 101 and the second longitudinal beam 103 is Y. The two connecting beams 102 are symmetrically arranged about the main beam 104. The distance between the first longitudinal beam 101 and the far end of the main beam 104 is M. Wherein, L = (1.85~1.95)V, V = (1.5~1.7)H, H = (2.5~4.5)M, Z = (1.25~1.45)Y = (5.5~7.5)X = (14.5~16.5)T, L = (36.5~38.5)T. Here, by limiting the aspect ratios of key components in the frame assembly 100, such as the main crossbeam 104 and the upper door panel frame 106, the dimensional relationships of the components in the longitudinal beam assembly, and the relative positional relationships of the longitudinal beam assembly on the main crossbeam 104, while achieving greater strength and rigidity for each component itself, the upper pressing component on the upper door panel frame 106 applies a downward pressing force to the workpiece 400, and simultaneously transmits the force through the workpiece 400 to the H-shaped longitudinal beam assembly, and then to the main crossbeam 104. At the same time, the upper pressing component receives an upward reaction force. The force and reaction force act on the upper door panel frame 106. Since the upper door panel frame 106 is fixedly installed relative to the main crossbeam 104, the reaction force is guided back to the main crossbeam 104 by the bracket, so that the holding force forms a complete force cycle through the closed frame inside the equipment. The internal force circulation path is extremely short, resulting in excellent deformation performance and ensuring the stability of the holding force. At the same time, it reduces the foundation load. The foundation only needs to support the weight of the equipment and external interference forces, without having to resist the huge holding reaction force, thus reducing the requirements for the foundation. Moreover, the internal force circulation helps to isolate the vibration of the pressing process inside the equipment, without affecting the external environment. By limiting the size matching ratio of the above-mentioned components, both strength and material waste are ensured, greatly reducing the overall weight and cost of the equipment. At the same time, the clear force flow path avoids unpredictable stress concentration. The frame assembly 100 is set as a whole frame, eliminating the flexible links that may exist in bolted connections, greatly improving the overall rigidity, ensuring that the deformation of the entire equipment is minimal and the strength is high while bearing huge working loads. Lightweighting is achieved through optimized material distribution.

[0076] See appendix Figure 5-7The workbench assembly 200 includes: a workbench frame 201, formed by welding square tubing; a workbench crossbeam 202, arranged along the length of the workbench frame 201 and located at the middle of the workbench frame 201; a tailstock screw 203, arranged parallel to the workbench crossbeam 202 along the length of the workbench frame 201 and rotatably mounted on the workbench frame 201 at both ends; and several workpiece positioning plates 206, extending along the width of the workbench frame 201, with both ends respectively mounted on the workbench frame 201 for limiting the workpiece 400. It is understood that each workbench frame 201 is equipped with a slide rail along its length, and a workbench slider 204 is mounted on the slide rail. A workbench sliding nut 205 is installed in the middle of the workbench crossbeam 202, which is threadedly engaged with the screw mounted on the longitudinal beam assembly. The workbench slider 204 is slidably engaged with the slide rails on the upper surfaces of the first longitudinal beam 101 and the second longitudinal beam 103.

[0077] See appendix Figure 8-10 The workpiece positioning plate 206 includes: a plate body 2061; side baffles 2062, vertically installed on both sides of the upper surface of the plate body 2061 for blocking and limiting the workpiece 400 on both sides; side columns 2063, located on both sides of the lower surface of the plate body 2061 for fixing the plate body 2061 to both sides of the workbench frame 201; the plate body 2061 is provided with several sets of positioning holes 2064, which are used for the detachable installation of one side baffle 2062. Two parallel reinforcing plates 2065 are installed on the lower surface of the plate body 2061, which are located between the two rows of positioning holes 2064 and the center distance between the two rows of positioning holes 2064 is K. The width of the plate body 2061 is Q, and the length of the plate body 2061 is P, where Q = (2~3)K and P = (10~11)Q. By limiting the length-to-width ratio of the workpiece positioning plate 206 and the center distance of the positioning holes 2064, the strength and bending resistance of the workpiece positioning plate 206 can be guaranteed to the maximum extent, thereby effectively positioning the workpiece 400 and helping to ensure the consistency of the expansion joint rate.

[0078] Specifically, see Appendix Figure 11The tailstock clamping assembly 300 is slidably mounted on the workbench assembly 200 along the tube expansion direction. Specifically, the tailstock clamping assembly 300 includes: a support body 301, slidably mounted on the workbench frame 201; specifically, two tailstock nuts 303 are fixedly mounted on the bottom of the support body 301, and the tailstock nuts 303 are threadedly installed with tailstock screws 203 on the workbench frame 201; at the same time, a slider is mounted on the bottom of the support body 301 and slidably engaged with a slide rail on the upper surface of the workbench frame 201; and U-tube clamps 302, the number of which is consistent with the number of U-shaped tubes of the workpiece to be expanded, for one-time limiting of the workpiece 400 U-shaped tube. The U-shaped tube clamps 302 are regularly arranged and installed on the bracket body 301, and the bracket body 301 is provided with a clamping drive unit 304. The clamping drive unit 304 is used to drive the clamping claws to clamp and release the U-shaped tubes. It can be understood that the fixing and limiting method of the U-shaped tubes of the copper tubes by the U-shaped tube clamps 302 is a conventional technical means, which will not be elaborated on here. The number of U-shaped tube clamps 302 is the same as the number of U-shaped tubes of the copper tubes of the workpiece 400 in order to realize that the tailstock clamping assembly 300 can limit the workpiece 400 at one time.

[0079] When using the tube expander of this utility model to expand the workpiece 400, the workpiece 400 is placed on the workpiece positioning plate 206 of the worktable assembly 200. The worktable assembly 200 moves to move the workpiece 400 to the designated position. The tailstock clamping assembly 300 moves to fix and limit the U-shaped tube at the tail end of the workpiece 400 in one go. The gripper assembly 500 works to clamp the copper tube at the top of the workpiece 400. The tube expander assembly 600 moves to expand the copper tube. Then the workpiece 400 moves with the worktable assembly 200 to complete the tube expander operations of different zones in sequence.

[0080] Example 2

[0081] See appendix Figure 12-14The tailstock clamping assembly 300 is slidably mounted on the frame assembly 100 along the expansion tube direction. Specifically, the tailstock clamping assembly 300 includes: a bracket body 301, which is slidably mounted on the upper door panel frame 106. It can be understood that the bracket body 301 is slidably mounted on a slide rail on the side of the upper door panel frame 106 via a slider. A tailstock nut 303 is also mounted on the bracket body 301. The tailstock nut 303 is slidably mounted on the upper door panel frame 106 via a screw. The screw is fixedly mounted on the upper door panel frame 106 and extends in the same direction as the expansion tube. The screw is driven to rotate by a motor mounted on the upper door panel frame 106. This allows the support body 301 to slide; the U-shaped clamp 302 includes several sets of different models to adapt to U-shaped tubes with different arrangement rules, and the number of U-shaped clamps 302 is the same as the number of expansion heads. It can be understood that the U-shaped clamp 302's method of fixing and limiting the copper tube U-shaped tube is a conventional technical means, which will not be elaborated on here. The U-shaped clamp 302 is set to several sets of different models, and combined with the installation form of the tailstock clamping assembly 300, the tailstock clamping assembly 300 and the tube expansion assembly 600 cooperate to partially limit the U-shaped tube. Different types of U-shaped clamps 302 can be installed on the support body 301 to adapt to workpieces 400 of different specifications and expand the scope of application.

[0082] When using the tube expander of this utility model to expand the workpiece 400, the workpiece 400 is placed on the workpiece positioning plate 206 of the worktable assembly 200. The worktable assembly 200 moves to move the workpiece 400 to the designated position. The tailstock clamping assembly 300 moves to fix and limit the partial U-shaped tube at the tail end of the workpiece 400. The gripper assembly 500 works to clamp the copper tube at the top of the workpiece 400. The tube expander assembly 600 moves to expand the copper tube. Then the workpiece 400 moves with the worktable assembly 200. The tailstock clamping assembly 300 fixes and limits the U-shaped tube in the next section. The tube expander operations of different sections are completed in sequence.

[0083] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0084] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lightweight and efficient combined tube expander, characterized in that, include: Rack assembly (100); The worktable assembly (200) is used to support and limit the workpiece (400) while slidingly mounted on the frame assembly (100); Tailstock clamping assembly (300) is used to limit the end of the workpiece (400) away from the expansion head assembly; The gripper assembly (500) and the tube expansion assembly (600) are both mounted on the frame assembly (100). The gripper assembly (500) is used to clamp and fix the copper tube of the workpiece (400) to cooperate with the tube expansion assembly (600) to expand the copper tube. The number of rows of grippers and expansion heads of the tube expansion assembly (600) is the same as the number of rows of the workpiece (400). The sliding direction of the worktable assembly (200) is perpendicular to the expansion direction of the workpiece (400), and the gripper assembly (500) and the expansion assembly (600) are slidably mounted on the frame assembly (100) and their sliding direction is perpendicular to the sliding direction of the worktable assembly (200).

2. The lightweight and efficient combined tube expander according to claim 1, characterized in that, The rack assembly (100) includes: Total crossbeam (104); The longitudinal beam assembly, which spans across the main crossbeam (104), has its bottom at the same level as the bottom of the main crossbeam (104). The longitudinal beam assembly is configured as an H-shaped structure and is used for sliding installation of the workbench assembly (200). The upper door panel assembly is installed above the main crossbeam (104) to support the upper door panel frame (106), which is used to install the upper pressure assembly, which is used to limit the top of the workpiece (400) to be expanded. The sub-beam (107) is mounted above the main beam (104) by several support columns (109) at its bottom and is used for sliding installation of the gripper assembly (500) and the expansion tube assembly (600).

3. The lightweight and efficient combined tube expander according to claim 2, characterized in that, The longitudinal beam assembly includes: The first longitudinal beam (101) is installed on the ground at both ends of its bottom via adjusting columns; The second longitudinal beam (103) is installed on the ground at both ends of its bottom via adjusting columns; There are at least two connecting beams (102), and the two ends of each connecting beam (102) are respectively installed perpendicularly to the ends of the first longitudinal beam (101) and the second longitudinal beam (103); The bottom center of the first longitudinal beam (101) and the second longitudinal beam (103) are fixedly installed relative to the main crossbeam (104). The upper surfaces of the first longitudinal beam (101) and the second longitudinal beam (103) are each equipped with slide rails extending along their length. A screw for sliding guide of the worktable assembly (200) is installed between the connecting crossbeams (102) at both ends of the longitudinal beam assembly. The extension direction of the screw is consistent with the extension direction of the slide rails on the first longitudinal beam (101) and the second longitudinal beam (103).

4. The lightweight and efficient combined tube expander according to claim 3, characterized in that, The upper door panel assembly includes: The upper door panel uprights (108) are two in number and are installed on the main crossbeam (104) at the bottom via support columns (109); The upper door panel frame (106) is installed at both ends on the top of the upper door panel column (108). Several upper pressing components are slidably installed on the upper door panel frame (106). The upper pressing components include a sliding support plate slidably installed on the upper door panel frame (106). An upper pressing power unit is installed on the sliding support plate. An upper pressing plate (105) is installed at the power end of the upper pressing power unit. The upper pressing plate (105) is driven by the upper pressing power unit to descend and limit the top of the workpiece (400).

5. A lightweight and efficient combined tube expander according to claim 4, characterized in that, The length of the main crossbeam (104) is L and the width is W. The length of the upper door panel frame (106) is V and the width is X. The distance between the first longitudinal beam (101) and the second longitudinal beam (103) is H. The length of both the first longitudinal beam (101) and the second longitudinal beam (103) is Z. The distance between the two connecting crossbeams (102) located at both ends of the first longitudinal beam (101) and the second longitudinal beam (103) is Y. 102) The main beam (104) is symmetrically arranged. The distance between the first longitudinal beam (101) and the far end of the main beam (104) is M, where: L = (1.85~1.95)V, V = (1.5~1.7)H, H = (2.5~4.5)M, Z = (1.25~1.45)Y = (5.5~7.5)X = (14.5~16.5)T, L = (36.5~38.5)T.

6. The lightweight and efficient combined tube expander according to claim 1, characterized in that, The workbench assembly (200) includes: Workbench frame (201); The workbench crossbeam (202) is set along the length of the workbench frame (201) and is located in the middle of the workbench frame (201); The tailstock screw (203) is set parallel to the workbench beam (202) along the length of the workbench frame (201) and both ends are rotatably mounted on the workbench frame (201); The workpiece positioning plate (206) includes several plates that extend along the width direction of the workbench frame (201), and both ends of the plates are respectively installed on the workbench frame (201) to limit the workpiece (400).

7. A lightweight and efficient combined tube expander according to claim 6, characterized in that, The workpiece positioning plate (206) includes: Plate(2061); Side baffles (2062) are vertically installed on both sides of the upper surface of the plate (2061) to block and limit the workpiece (400) on both sides; Side columns (2063), located on both sides of the lower surface of the plate (2061), are used to mount the plate (2061) on both sides of the workbench frame (201); The plate (2061) is provided with several sets of positioning holes (2064), which are used for the detachable installation of a side baffle (2062). Two parallel reinforcing plates (2065) are installed on the lower surface of the plate (2061). The reinforcing plates (2065) are located between the two rows of positioning holes (2064) and the center distance between the two rows of positioning holes (2064) is K. The width of the plate (2061) is Q and the length of the plate (2061) is P, where Q = (2~3)K and P = (10~11)Q.

8. The lightweight and efficient combined tube expander according to claim 1, characterized in that, The tailstock clamping assembly (300) is slidably mounted on the frame assembly (100) along the tube expansion direction or on the worktable assembly (200) along the tube expansion direction.

9. A lightweight and efficient combined tube expander according to claim 8, characterized in that, The tailstock clamping assembly (300) includes: The bracket body (301) is slidably mounted on the upper door panel frame (106); U-shaped tube clamps (302), the number of which is the same as the number of expansion heads, are used to limit and fix the U-shaped tube to be expanded on the workpiece (400). The U-shaped tube clamps (302) are regularly arranged and installed on the support body (301), and the support body (301) is provided with a clamping drive unit (304). The clamping drive unit (304) is used to drive the clamping claw to perform clamping and releasing actions on the U-shaped tube.

10. A lightweight and efficient combined tube expander according to claim 8, characterized in that, The tailstock clamping assembly (300) includes: The support body (301) is slidably mounted on the workbench frame (201); U-tube clamp (302) includes several sets of different models to accommodate U-shaped tubes with different arrangement rules, and the number of U-shaped tubes of the U-tube clamp (302) is consistent with the number of U-shaped tubes to be expanded.

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