Automatic bending machine for yacht pipes and bending method thereof

Abstract

The present invention discloses an automatic bending machine for pipe materials for yachts, comprising a frame, a feeding mechanism, a positioning mechanism, a bending mechanism, a preheating mechanism and a lubricating mechanism, wherein the feeding mechanism is mounted on the frame and used for conveying pipe materials, the positioning mechanism is fixed on one side of the frame and located at the discharge end of the feeding mechanism, the bending mechanism is mounted on the driving end of the positioning mechanism, the preheating mechanism and the lubricating mechanism are sequentially mounted on the bending mechanism and located on one side of the feeding mechanism, and are respectively used for preheating and surface lubrication of pipe materials; the lubricating mechanism comprises a driving module 1, a moving plate 1, an oil barrel and an oil brushing assembly. The present invention realizes the automation of preheating and lubricating of pipe materials, and solves the problems of uneven lubrication and inadequate lubrication.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, in particular to an automatic pipe bending machine for yachts and a bending method thereof. Background Art

[0002] Yacht pipes usually refer to various pipes and fittings used in yacht manufacturing. These materials need to have good corrosion resistance, water resistance and sufficient strength, so stainless steel is very common in the application of yacht pipes. During the manufacturing process, yacht pipes may need to be bent to adapt to the structural design and spatial layout of the yacht, and the bending machine is an important equipment for bending pipes.

[0003] The bending machine includes a basic feeding mechanism and a bending mechanism. By limiting one side of the pipe material, the bending mechanism applies pressure to the other side to bend it. In order to ensure the bending quality of the pipe material, suitable lubricants and coolants are used during the bending process to reduce friction and heat generation and prevent thermal damage to the material.

[0004] The amount of lubricant used for pipe materials should be moderate. Excessive lubricant may cause delayed plasticization of materials during processing and affect the molding quality. It is generally recommended to apply an appropriate amount of lubricant on machine parts to ensure the lubrication effect and avoid excessive residues that affect subsequent processing. Therefore, the application of lubricants requires manual control, and manual application of lubricants requires positioning of the bending position, which is time-consuming and laborious. Summary of the invention

[0005] The object of the present invention is to provide an automatic bending machine for yacht pipes and a bending method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic bending machine for pipes for yachts, comprising a frame, a feeding mechanism, a positioning mechanism, a bending mechanism, a preheating mechanism and a lubricating mechanism, wherein the feeding mechanism is installed on the frame and used to transport pipes, the positioning mechanism is fixed on one side of the frame and is located at the discharge end of the feeding mechanism, the bending mechanism is installed on the driving end of the positioning mechanism, the preheating mechanism and the lubricating mechanism are sequentially installed on the bending mechanism and are located on one side of the feeding mechanism, and are used for preheating and surface lubrication of the pipes respectively;

[0007] According to the above technical solution, the lubrication mechanism includes a driving module 1, a moving plate 1, an oil barrel and an oil brushing assembly, wherein the moving plate 1 is connected to the moving end of the driving module 1, the oil barrel is fixed on the moving plate 1, and the oil brushing assembly is connected to the outlet of the oil barrel;

[0008] According to the above technical solution, the oil brushing assembly includes a switch valve and an oil delivery plate, wherein the oil delivery plate is provided with an oil delivery groove, the inlet end of the switch valve is connected to the oil barrel, the outlet end of the switch valve is connected to the oil delivery groove, a plurality of sensing grooves are provided at the bottom of the oil delivery groove, the sensing grooves are provided with pressure sensing units, a plurality of fixing plates are provided on the upper side of the oil delivery groove corresponding to the oil delivery groove cover, the sensing groove is connected with a spring 1, a plug column is passed through the fixing plate, one end of the plug column is connected to the spring 1, and the other end of the plug column is connected to a sponge block.

[0009] According to the above technical solution, the oil barrel includes a fixed outer barrel, an oil storage inner barrel and a rotating cover plate, wherein the fixed outer barrel is arranged around the outside of the oil storage inner barrel, the rotating cover plate is arranged on the oil storage inner barrel, the part of the rotating cover plate located in the oil storage inner barrel is connected to a stirring blade, and the part of the rotating cover plate located between the oil storage inner barrel and the fixed outer barrel is connected to a push plate.

[0010] According to the above technical solution, the preheating mechanism includes a driving module 2, a movable plate 2, an air box and a preheating component, wherein the movable plate 2 is connected to the movable end of the driving module 2, the air box is fixed on the movable plate 2, and the preheating component is fixed on the lower side of the movable plate 2 and connected to the air box.

[0011] According to the above technical solution, a gas input pump and two gas output pumps are provided on the gas box, a heating module is provided in the gas box, the heating module adopts electric heating, and the two gas output pumps are respectively connected to the oil barrel and the preheating component.

[0012] According to the above technical solution, the preheating assembly includes an outer arc track and an inner arc track, wherein the outer arc track and the inner arc track inner arc surface are both provided with a plurality of air holes, the outer arc track is a hollow structure and is connected to the gas output pump, and the inner arc track is slidably arranged on the inner side of the outer arc track and is connected to the outer arc track by spring 2.

[0013] According to the above technical solution, an air flow channel is opened on the bottom plate connecting the inner arc and the outer arc, a blocking block is fixed to one end of the inner arc extending out of the outer arc, and a friction block is arranged on the side of the blocking block facing the inner arc.

[0014] According to the above technical solution, a clamping block is arranged on the blocking block, a clamping groove is opened at the outer arc path corresponding to the position of the clamping block, and the clamping groove is provided with an electromagnetic module.

[0015] According to the above technical solution, the feeding mechanism includes a feeding cylinder, a feeding assembly and a screw drive module, wherein the feeding assembly is installed at the driving end of the screw drive module, the feeding cylinder is arranged in conjunction with the feeding assembly to push the pipe material into the feeding assembly, and the screw drive module is used to move the feeding assembly to the bending mechanism.

[0016] According to the above technical solution, the feeding assembly includes a moving seat, a feeding barrel, a fixed sleeve and a rotating module, wherein the feeding barrel is installed on the moving seat, the fixed sleeve is sleeved on the discharge end of the feeding barrel, one end of the fixed sleeve is provided with a claw clamp to cooperate with the pipe material processing, the other end of the fixed sleeve is provided with a locking module to cooperate with the feeding barrel, and the rotating module is connected to the feeding barrel for driving the feeding barrel to rotate.

[0017] According to the above technical solution, the bending mechanism includes a driving module, a fixed module and a movable module, wherein the movable module is connected to the driving module, and the fixed module is arranged in coordination with the movable module.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a lubrication mechanism, can apply an appropriate and uniform amount of lubricating oil to the pipe material according to the actual specifications of the pipe material, thereby avoiding the situation of too little or too much lubricating oil, and the lubricating oil is preheated and stirred before applying, thereby avoiding the situation of too low temperature of the lubricating oil and internal unevenness, thereby improving the lubrication quality; by providing a preheating mechanism, a preheating environment can be created by controlling the rotation of the pipe material, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the lubrication mechanism of the present invention;

[0022] Figure 3 It is a partial schematic diagram of the lubrication mechanism of the present invention;

[0023] Figure 4 It is a schematic diagram of the oil brushing assembly of the present invention;

[0024] Figure 5 is a partial cross-sectional view of the lubrication mechanism of the present invention;

[0025] Figure 6 is a partial cross-sectional view of an oil drum of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the preheating mechanism of the present invention;

[0027] Figure 8 is a partial cross-sectional view of a preheating assembly of the present invention;

[0028] Fig. 9 The present invention Figure 8 A magnified schematic diagram of area A;

[0029] Fig.10 The present invention Figure 8 A magnified schematic diagram of area B;

[0030] Fig.11 is a schematic diagram of a feeding assembly of the present invention;

[0031] Fig.12 is a schematic diagram of the bending mechanism of the present invention;

[0032] In the figure: 1, frame; 2, adjustment mechanism; 3, preheating mechanism; 31, drive module 2; 32, movable plate 2; 33, air box; 331, gas input pump; 332, gas output pump; 34, preheating assembly; 341, outer arc; 342, inner arc; 343, spring 2; 344, air flow channel; 345, blocking block; 346, friction block; 347, card block; 348, card slot; 35, air hole; 4, lubrication mechanism; 41, drive module 1; 42, movable plate 1; 43, oil drum; 431, fixed outer drum; 432, oil storage Inner barrel; 433, rotating cover plate; 434, stirring blade; 435, push plate; 436, partition plate; 44, oil brush assembly; 441, switch valve; 442, oil delivery plate; 443, oil delivery trough; 444, induction trough; 445, fixed plate; 446, spring 1; 447, plug; 448, sponge block; 51, feed cylinder; 52, feeding assembly; 521, moving seat; 522, feeding barrel; 523, fixed sleeve; 524, rotating module; 53, screw drive module; 61, drive module; 62, fixed module; 63, moving module. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-12The present invention provides a technical solution: an automatic bending machine for pipes for yachts, comprising a frame 1, a feeding mechanism, a positioning mechanism 2, a bending mechanism, a preheating mechanism 3 and a lubricating mechanism 4, wherein the feeding mechanism is installed on the frame 1 for conveying pipes, the positioning mechanism 2 is fixed on one side of the frame 1 and is located at the discharge end of the feeding mechanism, the bending mechanism is installed at the driving end of the positioning mechanism 2, the preheating mechanism 3 and the lubricating mechanism 4 are sequentially installed on the bending mechanism and are located on one side of the feeding mechanism, and are respectively used for preheating and surface lubrication of the pipes;

[0035] The lubrication mechanism 4 includes a driving module 41, a moving plate 42, an oil barrel 43 and an oil brushing assembly 44, wherein the moving plate 42 is connected to the moving end of the driving module 41, the oil barrel 43 is fixed on the moving plate 42, and the oil brushing assembly 44 is connected to the outlet of the oil barrel 43;

[0036] like Figure 4 As shown, the oil brushing assembly 44 includes a switch valve 441 and an oil delivery plate 442, wherein the oil delivery plate 442 is provided with an oil delivery groove 443, the inlet end of the switch valve 441 is connected to the oil barrel 43, the outlet end of the switch valve 441 is connected to the oil delivery groove 443, a plurality of sensing grooves 444 are provided at the bottom of the oil delivery groove 443, a pressure sensing unit is laid in the sensing groove 444, a plurality of fixing plates 445 are provided on the upper side of the oil delivery groove 443 corresponding to the cover of the oil delivery groove 443, the sensing groove 444 is connected to a spring 446, a plug column 447 is passed through the fixing plate 445, one end of the plug column 447 is connected to the spring 446, and the other end of the plug column 447 is connected to a sponge block 448.

[0037] The supplementary explanation based on the above structure is as follows: the driving module 41 adopts a two-axis driving structure, preferably but not limited to the form of cylinder driving, which is used to move the moving plate 42 to the position of the pipe material transported by the feeding mechanism, and the oil barrel 43 is used to transport lubricating oil to the oil delivery groove 443 of the oil delivery plate 442. A plurality of liquid grooves 449 are opened on the surface of the plug 447. Under normal conditions, the plug 447 is subjected to the pulling force of the spring 446. At this time, the height of the liquid groove 449 is lower than the oil delivery groove 443, and the plug 447 plays a blocking role; when the sponge block 448 is forced to squeeze the plug 447, the plug 447 moves up to compress the spring 446, and the liquid groove 449 is exposed to the inside of the oil delivery groove 443. The lubricating oil in the oil delivery groove 443 flows along the liquid groove 449 to the sponge block 448, and the plug 447 plays the role of conveying the lubricating oil. The sensing groove 444 is used to detect whether the plug 447 is subjected to external force. Preferably, the pressure sensing unit is connected to the switch valve 441 signal. When the pressure signal is detected, it indicates that the sponge block 448 has been pressed to the surface of the pipe material. The switch valve 441 starts to input lubricating oil to the oil delivery groove 443. When the lubrication of the pipe material surface is completed, the sponge block 448 is separated from the surface of the pipe material, the sensing groove 444 detects the tension signal, and the switch valve 441 stops conveying the lubricating oil. According to the actual lubrication needs, an appropriate amount of lubricating oil is delivered to ensure that the amount of lubricant is moderate.

[0038] like Figure 6 As shown, the oil barrel 43 includes a fixed outer barrel 431, an oil storage inner barrel 432 and a rotating cover plate 433, wherein the fixed outer barrel 431 is arranged around the outside of the oil storage inner barrel 432, the rotating cover plate 433 is covered on the oil storage inner barrel 432, the part of the rotating cover plate 433 located in the oil storage inner barrel 432 is connected to the stirring blade 434, and the part of the rotating cover plate 433 located between the oil storage inner barrel 432 and the fixed outer barrel 431 is connected to the push plate 435.

[0039] In actual operation, the fixed outer barrel 431 is provided with input and output holes for inputting high-temperature airflow. The high-temperature airflow is used to transfer heat to the lubricating oil in the oil storage inner barrel 432 to maintain good fluidity of the lubricating oil and ensure the lubrication quality. At the same time, the high-temperature airflow will push the push plate 435 to drive the rotating cover plate 433 to rotate during the input process, so that the stirring blade 434 rotates in the oil storage inner barrel 432. The stirring blade 434 stirs the lubricating oil, avoiding a large amount of precipitation at the bottom of the oil, improving the uniformity of the lubricating oil, and thus ensuring the subsequent lubrication quality.

[0040] Furthermore, in order to improve the stirring effect of the stirring blade 434, the length setting of the stirring blade 434 can be appropriately reduced, and the fixed outer barrel 431 is provided with a partition plate 436 at the bottom of the stirring blade 434 for producing the flow channel required for airflow drive, and the fixed outer barrel 431 is provided with an airflow input port and an output port respectively on the upper side and the lower side of the partition plate 436.

[0041] like Figure 7 As shown, the preheating mechanism 3 includes a driving module 2 31, a movable plate 2 32, an air box 33 and a preheating component 34, wherein the movable plate 2 32 is connected to the movable end of the driving module 2 31, the air box 33 is fixed on the movable plate 2 32, and the preheating component 34 is fixed on the lower side of the movable plate 2 32 and connected to the air box 33.

[0042] The gas box 33 is provided with a gas input pump 331 and two gas output pumps 332. A heating module is provided in the gas box 33. The heating module adopts but is not limited to electric heating. The two gas output pumps 332 are connected to the oil barrel 43 and the preheating component 34 respectively.

[0043] like Figures 8-10 As shown, the preheating assembly 34 includes an outer arc channel 341 and an inner arc channel 342, wherein the inner arc surfaces of the outer arc channel 341 and the inner arc channel 342 are both provided with a plurality of air holes 35, the outer arc channel 341 is a hollow structure and is connected to the gas output pump 332, and the inner arc channel 342 is slidably arranged on the inner side of the outer arc channel 341 and is connected to the outer arc channel 341 by a spring 2 343.

[0044] Furthermore, an air flow channel 344 is provided on the bottom plate connecting the inner arc 342 and the outer arc 341 , a blocking block 345 is fixed to one end of the inner arc 342 extending out of the outer arc 341 , and a friction block 346 is provided on the side of the blocking block 345 facing the inner arc.

[0045] In one embodiment, preferably, a clamping block 347 is provided on the blocking block 345 , a clamping groove 348 is opened at a position of the outer arc channel 341 corresponding to the clamping block 347 , and an electromagnetic module is laid in the clamping groove 348 .

[0046] In actual operation, under normal conditions, the inner arc 342 is located in the outer arc 341 under the pulling force of the spring 2 343, and the driving module 2 31 moves the preheating component 34 to one side of the pipe. It should be noted that the diameter width of the inner arc 342 and the outer arc 341 is adapted to the diameter width of the pipe. When the pipe is close to the friction block 346, the inner arc 342 is pulled away from the outer arc 341 by its own rotation, so that the clamping block 347 is inserted into the clamping groove 348. After being adsorbed and fixed by the electromagnetic module, the driving module 2 31 controls the friction block 346 to separate from the surface of the pipe, so that it is located in the sleeve composed of the outer arc 341 and the inner arc 342. The preheating airflow is input into the outer arc 341 through the air box 33, and the airflow is transported to the inner arc 342 through the airflow channel 344, and is transported to the surface of the pipe through the air holes 35 opened in the outer arc 341 and the inner arc 342, respectively, to achieve the preheating effect.

[0047] The feeding mechanism includes a feeding cylinder 51, a feeding assembly 52 and a screw drive module 53, wherein the feeding assembly 52 is installed at the driving end of the screw drive module 53, the feeding cylinder 51 is arranged in conjunction with the feeding assembly 52 to push the pipe material into the feeding assembly 52, and the screw drive module 53 is used to move the feeding assembly 52 to the bending mechanism.

[0048] It is necessary to add that: Fig.11 As shown, the feeding assembly 52 includes a moving seat 521, a feeding barrel 522, a fixed sleeve 523 and a rotating module 524, wherein the feeding barrel 522 is installed on the moving seat 521, the fixed sleeve 523 is sleeved on the discharge end of the feeding barrel 522, one end of the fixed sleeve 523 is provided with a claw clamp to cooperate with the pipe material processing, and the other end of the fixed sleeve 523 is connected to the feeding barrel 522 and provided with a locking module, and the rotating module 524 is connected to the feeding barrel 522 for driving the feeding barrel 522 to rotate.

[0049] Furthermore, in one embodiment, the rotating module 524 adopts a structure coordinated with a motor pulley, and the locking module is used for locking when the tube material does not need to be rotated, including a cylinder and shaft combination, and the feeding of the shaft is controlled by the telescopic movement of the cylinder to achieve locking between the feeding barrel 522 and the fixed sleeve 523.

[0050] The positioning mechanism 2 preferably adopts a two-axis cylinder driven structure.

[0051] like Fig.12 As shown, the bending mechanism includes a driving module 61, a fixed module 62 and a movable module 63, wherein the movable module 63 is connected to the driving module 61, and the fixed module 62 is arranged in cooperation with the movable module 63. In actual operation, the bending mechanism as a whole can be adjusted in position by the positioning mechanism 2, the fixed module 62 is connected to a cylinder for separation or attachment with the movable module 63, the fixed module 62 is used for limiting the position of the pipe material, and the movable module 63 is used for bending the pipe material.

[0052] The specific bending method is as follows:

[0053] Step 1: Feeding, the pipe material is fed into the feeding mechanism, and the positioning mechanism 2 adjusts the positions of the bending mechanism, the preheating mechanism 3 and the lubrication mechanism 4;

[0054] Step 2: Preheating: the feeding mechanism moves the pipe material to the preheating mechanism 3, and the preheating assembly 34 approaches from one side of the pipe material. The pipe material is pressed against the friction block 346 and then rotates to bring out the inner arc 342. The outer arc 341 and the inner arc 342 form a sleeve through electromagnetic adsorption. The air box 33 inputs the heated air flow into the sleeve to preheat the surface of the pipe material. After the preheating is completed, the power is released so that the inner arc 342 is pulled back into the outer arc 341.

[0055] Step 3: Lubrication. The feeding mechanism conveys the pipe material to the lubrication mechanism 4. The oil brushing assembly 44 approaches the surface of the pipe material. The pipe material squeezes the sponge block 448 to push the plug 447 upward. When the sensing groove 444 detects a pressure signal, the switch valve 441 opens, and the lubricating oil is introduced into the oil delivery groove 443. The lubricating oil infiltrates the sponge block 448 through the liquid groove 449 on the plug 447. The pipe material rotates, and the sponge block 448 applies the lubricating oil to the surface of the pipe material. After the application is completed, the oil brushing assembly 44 is separated from the surface of the pipe material, the switch valve 441 is closed, and the lubricating oil stops entering the oil delivery groove 443.

[0056] Step 4: Bending: the feeding mechanism transports the tube material to the bending mechanism for bending.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic bending machine for pipes for yachts, comprising a frame (1), a feeding mechanism, a positioning mechanism (2), a bending mechanism, a preheating mechanism (3) and a lubrication mechanism (4), characterized in that: The feeding mechanism is mounted on the frame (1) and is used to transport the pipe material. The positioning mechanism (2) is fixed to one side of the frame (1) and is located at the discharge end of the feeding mechanism. The bending mechanism is mounted on the driving end of the positioning mechanism (2). The preheating mechanism (3) and the lubricating mechanism (4) are sequentially mounted on the bending mechanism and are located on one side of the feeding mechanism, and are used to preheat the pipe material and lubricate the surface thereof, respectively. The lubrication mechanism (4) comprises a driving module (41), a movable plate (42), an oil barrel (43) and an oil brushing assembly (44), wherein the movable plate (42) is connected to the movable end of the driving module (41), the oil barrel (43) is fixed on the movable plate (42), and the oil brushing assembly (44) is connected to the outlet of the oil barrel (43); The oil brushing assembly (44) comprises an on-off valve (441) and an oil delivery plate (442), wherein the oil delivery plate (442) is provided with an oil delivery groove (443), the inlet end of the on-off valve (441) is connected to the oil barrel (43), the outlet end of the on-off valve (441) is connected to the oil delivery groove (443), a plurality of sensing grooves (444) are provided at the bottom of the oil delivery groove (443), a pressure sensing unit is laid in the sensing groove (444), a plurality of fixing plates (445) are provided on the upper side of the oil delivery groove (443) corresponding to the cover of the oil delivery groove (443), the sensing groove (444) is connected to a spring 1 (446), a plug column (447) is passed through the fixing plate (445), one end of the plug column (447) is connected to the spring 1 (446), and the other end of the plug column (447) is connected to a sponge block (448); The oil barrel (43) comprises a fixed outer barrel (431), an oil storage inner barrel (432), and a rotating cover plate (433), wherein the fixed outer barrel (431) is arranged around the outside of the oil storage inner barrel (432), the rotating cover plate (433) is arranged on the oil storage inner barrel (432), a portion of the rotating cover plate (433) located inside the oil storage inner barrel (432) is connected to a stirring blade (434), a portion of the rotating cover plate (433) located between the oil storage inner barrel (432) and the fixed outer barrel (431) is connected to a push plate (435), the fixed outer barrel (431) is provided with a partition plate (436) at the bottom of the stirring blade (434) for producing a flow channel required for air flow drive, and the fixed outer barrel (431) is provided with an air flow input port and an air flow output port respectively on the upper side and the lower side of the partition plate (436); The driving module 1 (41) adopts a two-axis driving structure and is used to move the moving plate 1 (42) to the position of the pipe material transported by the feeding mechanism. The oil barrel (43) is used to transport lubricating oil to the oil delivery groove (443) of the oil delivery plate (442). The surface of the plug (447) is provided with a plurality of liquid grooves (449); In a normal state, the plug (447) is subjected to the pulling force of the spring 1 (446). At this time, the height of the liquid groove (449) is lower than the oil delivery groove (443), and the plug (447) plays a blocking role. When the sponge block (448) is pressed against the plug (447), the plug (447) moves upward to compress the spring 1 (446), and the liquid groove (449) is exposed to the oil delivery groove (443). The lubricating oil in the oil delivery groove (443) flows along the liquid groove (449) to the sponge block (448), and the plug (447) starts to move. The sensing groove (444) is used to detect whether the piston (447) is subjected to external force. The pressure sensing unit is connected to the switch valve (441) by signal. When the pressure signal is detected, it indicates that the sponge block (448) has been pressed against the surface of the pipe material. The switch valve (441) starts to input the lubricating oil into the oil delivery groove (443). When the lubrication of the pipe material surface is completed, the sponge block (448) is separated from the pipe material surface, the sensing groove (444) detects the tension signal, and the switch valve (441) stops delivering the lubricating oil.

2. The automatic bending machine for yacht pipes according to claim 1 is characterized in that: The preheating mechanism (3) comprises a second driving module (31), a second moving plate (32), an air box (33) and a preheating assembly (34), wherein the second moving plate (32) is connected to the moving end of the second driving module (31), the air box (33) is fixed on the second moving plate (32), and the preheating assembly (34) is fixed on the lower side of the second moving plate (32) and connected to the air box (33).

3. The automatic bending machine for yacht pipes according to claim 2 is characterized by: The gas box (33) is provided with a gas input pump (331) and two gas output pumps (332). A heating module is provided in the gas box (33), and the heating module adopts an electric heating form. The two gas output pumps (332) are respectively connected to the oil barrel (43) and the preheating component (34).

4. The automatic bending machine for yacht pipes according to claim 3 is characterized by: The preheating assembly (34) comprises an outer arc track (341) and an inner arc track (342), wherein the inner arc surfaces of the outer arc track (341) and the inner arc track (342) are both provided with a plurality of air holes (35), the outer arc track (341) is a hollow structure and is connected to the gas output pump (332), and the inner arc track (342) is slidably arranged inside the outer arc track (341) and is connected to the outer arc track (341) by a second spring (343).

5. The automatic bending machine for yacht pipes according to claim 4 is characterized by: An air flow channel (344) is provided on a bottom plate connecting the inner arc channel (342) and the outer arc channel (341); a blocking block (345) is fixed to one end of the inner arc channel (342) extending out of the outer arc channel (341); and a friction block (346) is provided on the side of the blocking block (345) facing the inner arc; The blocking block (345) is provided with a clamping block (347), the outer arc path (341) is provided with a clamping groove (348) at a position corresponding to the clamping block (347), and the clamping groove (348) is provided with an electromagnetic module.

6. The automatic bending machine for yacht pipes according to claim 5, characterized in that: The feeding mechanism comprises a feeding cylinder (51), a feeding assembly (52) and a screw drive module (53), wherein the feeding assembly (52) is installed at the driving end of the screw drive module (53), the feeding cylinder (51) is arranged in conjunction with the feeding assembly (52) to push the pipe material into the feeding assembly (52), and the screw drive module (53) is used to move the feeding assembly (52) to the bending mechanism.

7. The automatic bending machine for yacht pipes according to claim 6, characterized in that: The feeding assembly (52) comprises a movable seat (521), a feeding barrel (522), a fixed sleeve (523) and a rotating module (524), wherein the feeding barrel (522) is mounted on the movable seat (521), the fixed sleeve (523) is sleeved on the discharge end of the feeding barrel (522), one end of the fixed sleeve (523) is provided with a claw clamp in cooperation with the tube material processing, the other end of the fixed sleeve (523) is provided with a locking module in cooperation with the feeding barrel (522), and the rotating module (524) is connected to the feeding barrel (522) and is used to drive the feeding barrel (522) to rotate.

8. A bending method of a bending machine, applicable to the automatic bending machine for yacht pipes according to claim 7, characterized in that: The specific bending method is as follows: Step 1: feeding the material, the pipe material is fed into the feeding mechanism, and the positioning mechanism (2) adjusts the positions of the bending mechanism, the preheating mechanism (3) and the lubrication mechanism (4); Step 2: preheating, the feeding mechanism moves the pipe material to the preheating mechanism (3), the preheating component (34) approaches from one side of the pipe material, the pipe material is pressed against the friction block (346) and then rotates to bring out the inner arc path (342), and the outer arc path (341) and the inner arc path (342) are formed into a sleeve through electromagnetic adsorption, and the air box (33) inputs the heated air flow into the sleeve to preheat the surface of the pipe material. After the preheating is completed, the power is released so that the inner arc path (342) is pulled back into the outer arc path (341); Step 3: Lubrication, the feeding mechanism conveys the pipe material to the lubrication mechanism (4), the oil brushing assembly (44) approaches the surface of the pipe material, the pipe material squeezes the sponge block (448) to push the plug (447) upward, when the sensing groove (444) detects the pressure signal, the switch valve (441) opens, the lubricating oil is introduced into the oil delivery groove (443), the lubricating oil penetrates the sponge block (448) through the liquid groove (449) on the plug (447), the pipe material rotates, and the sponge block (448) applies the lubricating oil to the surface of the pipe material. After the application is completed, the oil brushing assembly (44) is separated from the surface of the pipe material, the switch valve (441) is closed, and the lubricating oil stops being introduced into the oil delivery groove (443); Step 4: Bending: the feeding mechanism transports the tube material to the bending mechanism for bending.

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