Automatic bending equipment for circular section

Abstract

The application relates to a circular profile automatic bending equipment, which comprises a base, the upper end outer surface of the base is fixedly connected with a feeding device, the front end outer surface of the base is provided with a bending device, the lower end inner surface of the bending device is fixedly connected with a rectangular box, the lower end outer surface of the rectangular box is fixedly connected with a lubricating oil tank assembly, the rear end inner surface of the rectangular box is fixedly connected with a rectangular oil pipe, and the front end outer surface of the rectangular oil pipe is provided with a nozzle. The application effectively solves a plurality of technical problems existing in the lubricating link of traditional equipment through the innovative design of the lubricating system, the equipment adopts a closed circulating lubricating structure, the lubricating oil tank assembly is organically combined with a filtering system, the pollution problem caused by the traditional open lubricating mode is fundamentally changed, the lubricating oil is doubly filtered through a coarse filtering assembly and a fine filtering assembly, and the effect of completely removing the mixed metal scraps and machining impurities in the use process can be achieved.

Description

Technical Field

[0001] This application relates to the technical field of metal processing, and in particular to an automatic bending device for circular profiles. Background Technology

[0002] The automatic bending equipment for circular profiles is an automated processing equipment used for bending and forming circular cross-section materials such as metal pipes and bars. This equipment achieves precise bending of metal profiles through a mechanical transmission system, hydraulic or servo drive mechanism, combined with precision molds. Its core functions include automatic feeding, positioning and clamping, bending and forming, and finished product output. It can efficiently complete bending requirements of different angles and curvatures. The equipment adopts a modular design and can be adapted to molds of various specifications to meet the processing requirements of pipes of different diameters.

[0003] In traditional automatic bending equipment for circular profiles, the lubrication system design often suffers from significant deficiencies. These machines typically employ an open lubrication system, allowing metal shavings and processing impurities to easily contaminate the lubricating oil during use. The lack of an effective filtration and recovery mechanism leads to rapid oil contamination and deterioration. Without dedicated filtration devices, impurities enter critical moving parts with the lubricating oil, accelerating wear on precision components like the lead screw and affecting the equipment's operational accuracy. More seriously, traditional equipment cannot recycle the lubricating oil; used oil is often directly discharged, wasting resources and polluting the environment. Regarding lubrication methods, older equipment often uses simple dripping or brushing, resulting in uneven lubrication and difficulty in covering critical friction surfaces. Spray lubrication lacks directional spraying capabilities, failing to clean while lubricating. These problems lead to high maintenance costs, frequent parts replacements, and severely impact production efficiency and processing quality. With increasing environmental requirements and growing demands for processing precision, this crude lubrication system is no longer sufficient to meet the demands of modern manufacturing. Summary of the Invention

[0004] To improve the efficiency of lubricant use, this application provides an automatic bending device for circular profiles.

[0005] This application provides an automatic bending device for circular profiles, which adopts the following technical solution: An automatic bending device for circular profiles includes a base. A feeding device is fixedly connected to the upper outer surface of the base. A bending device is provided on the front outer surface of the base. A rectangular box is fixedly connected to the lower inner surface of the bending device. A lubricating oil tank assembly is fixedly connected to the lower outer surface of the rectangular box. A rectangular oil pipe is fixedly connected to the rear inner surface of the rectangular box. A nozzle is provided on the front outer surface of the rectangular oil pipe. A rolling resistance screw is fixedly connected to the inner cavity of the rectangular box. A filter closure structure is provided on the left outer surface of the rectangular box. An oil filter assembly is provided on the right outer surface of the filter closure structure. A pop-out structure is fixedly connected to the right outer surface of the oil filter assembly. A coarse filter assembly and a fine filter assembly are movably connected to the front outer surface of the oil filter assembly. The lubricating oil tank assembly includes a lubricating oil tank body. An oil pump assembly is fixedly connected to the left outer surface of the lubricating oil tank body.

[0006] As a preferred embodiment of this application, the filter closure structure includes a rectangular baffle, a rotating shaft is fixedly connected to the left outer surface of the rectangular baffle, and a first screw and a second screw are movably connected to the left inner surface of the filter closure structure. The coarse filter assembly includes a first mounting frame, a coarse filter screen is fixedly connected to the inner wall of the first mounting frame, and a first inner handle is fixedly connected to the upper outer surface of the first mounting frame. The fine filter assembly includes a second mounting frame, a fine filter screen is fixedly connected to the inner wall of the second mounting frame, and a second inner handle is fixedly connected to the lower inner surface of the second mounting frame. The structure includes a rectangular limiting block, a circular connecting rod fixedly connected to the left outer surface of the rectangular limiting block, the left outer surface of the circular connecting rod being connected to the right outer surface of the oil filter assembly, a movable rod movably connected to the right outer surface of the rectangular limiting block, a spring sleeved on the outer wall of the movable rod, a circular plate fixedly connected to the right outer surface of the movable rod, and a circular limiting block fixedly connected to the left outer surface of the movable rod, the circular limiting block being located to the left of the rectangular limiting block. The oil pump assembly includes a rectangular mounting box, and an oil pump is fixedly connected to the inner cavity of the rectangular mounting box.

[0007] As a preferred embodiment of this application, an oil inlet is fixedly connected to the upper outer surface of the main body of the lubricating oil tank, an oil delivery pipe is fixedly connected to the left outer surface of the oil pump assembly, one end of the oil delivery pipe is connected to a rectangular oil pipe, the oil outlet of the nozzle is located directly behind the rolling resistance screw, an inclined plate is fixedly connected to the lower inner surface of the rectangular box, and a rectangular oil outlet groove is opened in front of the lower inner surface of the rectangular box.

[0008] As a preferred embodiment of this application, the inner rear surface of the rectangular box is provided with a first mounting groove adapted to the rectangular oil pipe, and the rectangular box is fixedly connected to the rectangular oil pipe through the first mounting groove. The outer left side surface of the lubricating oil tank body is provided with a second mounting groove adapted to the oil pump assembly, and the lubricating oil tank body is fixedly connected to the oil pump assembly through the second mounting groove.

[0009] As a preferred embodiment of this application, the upper outer surface of the lubricating oil tank body is provided with a rectangular lower oil port that matches the oil inlet, and the lubricating oil tank body is fixedly connected to the oil inlet through the rectangular lower oil port.

[0010] As a preferred embodiment of this application, the front outer surface of the oil filter assembly is provided with a first limiting groove adapted to the coarse filter assembly, and the oil filter assembly is movably connected to the coarse filter assembly through the first limiting groove. The front outer surface of the oil filter assembly is provided with a second limiting groove adapted to the fine filter assembly, and the oil filter assembly is movably connected to the fine filter assembly through the second limiting groove. The first limiting groove is located at the upper end of the second limiting groove.

[0011] As a preferred embodiment of this application, the upper outer surface of the first mounting frame is provided with a first rectangular mounting groove adapted to the first inner handle, and the first mounting frame is fixedly connected to the first inner handle through the first rectangular mounting groove. The lower outer surface of the second mounting frame is provided with a second rectangular mounting groove adapted to the second inner handle, and the second mounting frame is fixedly connected to the second inner handle through the second rectangular mounting groove.

[0012] As a preferred embodiment of this application, the front outer surface of the rectangular box is provided with a first circular hole adapted to the oil pipeline, and the rectangular box is fixedly connected to the oil pipeline through the first circular hole.

[0013] As a preferred embodiment of this application, the front outer surface of the oil pump assembly is provided with a second circular hole adapted to the oil pipeline, and the oil pump assembly is fixedly connected to the oil pipeline through the second circular hole.

[0014] As a preferred embodiment of this application, the oil inlet end of the oil pump is fixedly connected to an oil inlet conduit, one end of which is located in the inner cavity of the lubricating oil tank body, and the oil outlet end of the oil pump is connected to an oil delivery pipe.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The automatic circular profile bending equipment provided in this application effectively solves several technical problems in the lubrication process of traditional equipment through its innovatively designed lubrication system. The equipment adopts a closed-loop circulating lubrication structure, organically combining the lubricating oil tank assembly with the filtration system, fundamentally changing the pollution problem caused by the traditional open lubrication method. The lubricating oil undergoes dual filtration through coarse and fine filter components, which can thoroughly remove metal shavings and processing impurities mixed in during use, ensuring that the oil returning to the lubricating oil tank is always clean. This design not only significantly extends the service life of the lubricating oil, but also avoids the wear of precision moving parts such as the rolling resistance screw caused by impurities, thereby greatly improving the stability and processing accuracy of the equipment. It is particularly worth mentioning that the nozzle of this equipment adopts a directional spray design, which can achieve precise lubrication while also using oil pressure to flush and clean the surface of key components.

[0016] The lubrication system of this equipment integrates multiple functions in its structural design, demonstrating outstanding comprehensive performance advantages. The pop-out structure makes the disassembly and assembly of the oil filter assembly exceptionally convenient, allowing operators to complete daily maintenance without the need for special tools. This user-friendly design significantly reduces the equipment's maintenance and time costs. The rational layout of the lubricating oil tank assembly and the rectangular box ensures both smooth circulation of lubricating oil and the compactness of the overall equipment structure, avoiding the problem of traditional equipment where the lubrication system occupies too much space and affects operation. The combined design of the inclined plate and the rectangular oil outlet groove allows used lubricating oil to quickly flow back to the filtration system, effectively preventing secondary pollution caused by oil stagnation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural schematic diagram of the lubricating oil tank assembly in this application; Figure 3 This is a structural schematic diagram of the oil filter assembly in this application; Figure 4 This is a structural schematic diagram of the filtering component in this application; Figure 5 This is a structural schematic diagram of the rectangular box in this application; Figure 6 This is an enlarged structural diagram of point A in this application; Figure 7 This is an enlarged structural diagram of section B in this application.

[0018] Explanation of reference numerals in the attached drawings: 1. Base; 101. Feeding device; 102. Bending device; 2. Lubricating oil tank assembly; 201. Oil supply pipe; 202. Oil pump assembly; 203. Lubricating oil tank body; 204. Oil inlet; 3. Rectangular oil pipe; 301. Nozzle; 4. Filter closure structure; 401. First screw; 402. Second screw; 403. Rotating shaft; 5. Oil filter assembly; 6. Coarse filter assembly; 601. First mounting frame; 602. Coarse filter screen; 603. First inner handle; 7. Fine filter assembly; 701. Second mounting frame; 702. Fine filter screen; 703. Second inner handle; 8. Rectangular box; 801. Inclined plate; 802. Roller resistance screw; 9. Pop-out structure; 901. Circular connecting rod; 902. Circular limit block; 903. Spring component; 904. Circular piece; 905. Movable rod. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0020] See Figure 1-7 An automatic bending device for circular profiles includes a base 1. A feeding device 101 is fixedly connected to the upper outer surface of the base 1. A bending device 102 is provided on the front outer surface of the base 1. A rectangular box 8 is fixedly connected to the lower inner surface of the bending device 102. A lubricating oil tank assembly 2 is fixedly connected to the lower outer surface of the rectangular box 8. A rectangular oil pipe 3 is fixedly connected to the rear inner surface of the rectangular box 8. A nozzle 301 is provided on the front outer surface of the rectangular oil pipe 3. A rolling resistance screw 802 is fixedly connected to the inner cavity of the rectangular box 8. A filter closure structure 4 is provided on the left outer surface of the rectangular box 8. An oil filter assembly 5 is provided on the right outer surface of the filter closure structure 4. A pop-out structure 9 is fixedly connected to the right outer surface of the oil filter assembly 5. A coarse filter assembly 6 and a fine filter assembly 7 are movably connected to the front outer surface of the oil filter assembly 5. The lubricating oil tank assembly 2 includes a lubricating oil tank body 203. An oil pump assembly 202 is fixedly connected to the left outer surface of the lubricating oil tank body 203. The filter closure structure 4 includes a rectangular baffle. A rotating shaft 403 is fixedly connected to the outer left side surface of the rectangular baffle. A first screw 401 and a second screw 402 are movably connected to the inner left side surface of the filter closure structure 4. The coarse filter assembly 6 includes a first mounting frame 601. A coarse filter screen 602 is fixedly connected to the inner wall of the first mounting frame 601. A first inner handle 603 is fixedly connected to the outer upper surface of the first mounting frame 601. The fine filter assembly 7 includes a second mounting frame 701. A fine filter screen 702 is fixedly connected to the inner wall of the second mounting frame 701. A second inner handle 703 is fixedly connected to the inner lower surface of the second mounting frame 701. The pop-out structure... The assembly 9 includes a rectangular limiting block. A circular connecting rod 901 is fixedly connected to the left outer surface of the rectangular limiting block. The left outer surface of the circular connecting rod 901 is connected to the right outer surface of the oil filter assembly 5. A movable rod 905 is movably connected to the right outer surface of the rectangular limiting block. A spring 903 is sleeved on the outer wall of the movable rod 905. A circular piece 904 is fixedly connected to the right outer surface of the movable rod 905. A circular limiting block 902 is fixedly connected to the left outer surface of the movable rod 905. The circular limiting block 902 is located to the left of the rectangular limiting block. The oil pump assembly 202 includes a rectangular mounting box. An oil pump is fixedly connected to the inner cavity of the rectangular mounting box.

[0021] When the equipment is working, the base 1 provides overall support. The feeding device 101 transports the circular profile to be processed to the processing position of the bending device 102. The bending device 102 applies force to the profile to complete the bending and forming. During this process, the lubrication system operates synchronously to ensure the smooth operation of all moving parts of the equipment. The oil pump assembly 202 draws lubricating oil from the main body of the lubricating oil tank 203 and delivers it to the rectangular oil pipe 3 through the oil delivery pipe 201. The lubricating oil is precisely sprayed onto the surface of key moving parts such as the rolling resistance screw 802 through the nozzle 301. While completing the lubrication, the oil pressure is used to flush away impurities from the surface of the parts. The lubricating oil after use flows along the inclined plate 801 to the rectangular oil outlet groove at the front end of the rectangular box 8 under the action of gravity. First, it flows into the oil filter assembly 5 through the opening of the filter closed structure 4. The lubricating oil passes through the coarse filter assembly 6 and the fine filter assembly 7 for double filtration. 02. Larger particles are intercepted, and the fine filter screen 702 further filters out smaller particles. The filtered clean lubricating oil flows back to the main body of the lubricating oil tank 203, completing the recycling. When it is necessary to clean or replace the filter screen, the operator can pull the first inner handle 603 or the second inner handle 703 to pull out the coarse filter component 6 or the fine filter component 7 from the oil filter component 5. The design of the pop-out structure 9 makes this process easier. Simply press the circular plate 904, and the spring component 903 will be compressed to remove the filter component. The filter closing structure 4 is opened and closed through the rotating shaft component 403, which facilitates the maintenance of the entire filtration system. The first screw 401 and the second screw 402 ensure the sealing of the filtration system during operation. The entire system, through this cyclic filtration working method, not only ensures the lubrication effect but also achieves efficient resource utilization, greatly improving the reliability and economy of the equipment.

[0022] An oil inlet 204 is fixedly connected to the upper outer surface of the lubricating oil tank body 203. An oil delivery pipe 201 is fixedly connected to the left outer surface of the oil pump assembly 202. One end of the oil delivery pipe 201 is connected to the rectangular oil pipe 3. The oil outlet end of the nozzle 301 is located directly behind the rolling resistance screw 802. An inclined plate 801 is fixedly connected to the lower inner surface of the rectangular box 8. A rectangular oil outlet groove is opened in front of the lower inner surface of the rectangular box 8. The inner surface of the rear end of the rectangular box 8 is provided with a first mounting groove adapted to the rectangular oil pipe 3. The rectangular box 8 is fixedly connected to the rectangular oil pipe 3 through the first mounting groove. The outer surface of the left side of the lubricating oil tank body 203 is provided with a second mounting groove adapted to the oil pump assembly 202. The lubricating oil tank body 203 is fixedly connected to the oil pump assembly 202 through the second mounting groove. The outer surface of the upper end of the lubricating oil tank body 203 is provided with a rectangular lower oil port adapted to the oil inlet 204. The lubricating oil tank body 203 is fixedly connected to the oil inlet 204 through the rectangular lower oil port. The outer surface of the front end of the oil filter assembly 5 is provided with a first limiting groove adapted to the coarse filter assembly 6. The oil filter assembly 5 is movably connected to the coarse filter assembly 6 through the first limiting groove. The outer surface of the front end of the oil filter assembly 5 is provided with a second limiting groove adapted to the fine filter assembly 7. The oil filter assembly 5 is movably connected to the fine filter assembly 7 through the second limiting groove. The first limiting groove is located at the upper end of the second limiting groove. The upper outer surface of the first mounting frame 601 is provided with a first rectangular mounting groove that matches the first inner handle 603. The first mounting frame 601 is fixedly connected to the first inner handle 603 through the first rectangular mounting groove. The lower outer surface of the second mounting frame 701 is provided with a second rectangular mounting groove that matches the second inner handle 703. The second mounting frame 701 is fixedly connected to the second inner handle 703 through the second rectangular mounting groove. The front outer surface of the rectangular box 8 is provided with a first circular hole that matches the oil supply pipe 201. The rectangular box 8 is fixedly connected to the oil supply pipe 201 through the first circular hole. The front outer surface of the oil pump assembly 202 is provided with a second circular hole that matches the oil supply pipe 201. The oil pump assembly 202 is fixedly connected to the oil supply pipe 201 through the second circular hole. The oil inlet end of the oil pump is fixedly connected with an oil inlet conduit. One end of the oil inlet conduit is located in the inner cavity of the lubricating oil tank body 203. The oil outlet end of the oil pump is connected to the oil supply pipe 201.

[0023] This application's automatic circular profile bending equipment achieves a dual improvement in equipment operating efficiency and maintenance convenience through an innovative lubrication system structural design. The core of the lubrication system lies in the adoption of a modular and detachable filter device. Through the dual-stage filtration design of the coarse filter component 6 and the fine filter component 7, the lubricating oil is ensured to remain clean during use. The combined use of the filter closure structure 4 and the pop-up structure 9 makes filter replacement and maintenance simple and quick, greatly reducing the difficulty of equipment maintenance. The reasonable layout of the lubricating oil tank component 2 and the rectangular box 8, together with the design of the inclined plate 801 and the rectangular oil outlet groove, realizes the automatic return and recycling of lubricating oil, which not only ensures the lubrication effect but also improves the resource utilization rate.

[0024] The connection methods between the various components of the equipment are carefully designed. The positioning structures such as the first mounting groove and the second mounting groove ensure the accuracy and stability of the installation of each component. The setting of the first circular hole and the second circular hole makes the installation of the oil pipe 201 more convenient and reliable. The upper and lower layout of the first limit groove and the second limit groove, together with the user-friendly design of the first inner handle 603 and the second inner handle 703, enable operators to quickly complete the disassembly and assembly of the filter components. The entire system achieves efficient circulation of lubricating oil through the optimized design of the rectangular lower oil port and the oil inlet 204. While ensuring the normal operation of the equipment, it significantly extends the service life of the lubricating oil and reduces production costs. This design concept, which integrates efficient lubrication, convenient maintenance and environmental protection and energy saving, gives this equipment a significant technical advantage in the field of circular profile processing.

[0025] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic bending device for circular profiles, comprising a base (1), characterized in that: A feeding device (101) is fixedly connected to the upper outer surface of the base (1). A bending device (102) is provided on the front outer surface of the base (1). A rectangular box (8) is fixedly connected to the lower inner surface of the bending device (102). A lubricating oil tank assembly (2) is fixedly connected to the lower outer surface of the rectangular box (8). A rectangular oil pipe (3) is fixedly connected to the rear inner surface of the rectangular box (8). A nozzle (301) is provided on the front outer surface of the rectangular oil pipe (3). A rolling resistance wire is fixedly connected to the inner cavity of the rectangular box (8). The rectangular box (8) has a filter closure structure (4) on its left outer surface and an oil filter assembly (5) on its right outer surface. The oil filter assembly (5) has a pop-out structure (9) fixedly connected to its right outer surface. The oil filter assembly (5) has a coarse filter assembly (6) and a fine filter assembly (7) movably connected to its front outer surface. The lubricating oil tank assembly (2) includes a lubricating oil tank body (203) and an oil pump assembly (202) fixedly connected to its left outer surface.

2. The automatic bending equipment for circular profiles according to claim 1, characterized in that: The filter closure structure (4) includes a rectangular baffle, a rotating shaft (403) is fixedly connected to the outer left side of the rectangular baffle, and a first screw (401) and a second screw (402) are movably connected to the inner left side of the filter closure structure (4). The coarse filter assembly (6) includes a first mounting frame (601), a coarse filter screen (602) is fixedly connected to the inner wall of the first mounting frame (601), and a first inner handle (603) is fixedly connected to the outer upper end of the first mounting frame (601). The fine filter assembly (7) includes a second mounting frame (701), a fine filter screen (702) is fixedly connected to the inner wall of the second mounting frame (701), and a second inner handle (703) is fixedly connected to the inner lower end of the second mounting frame (701). The pop-up structure (9) includes a rectangular limiting block. A circular connecting rod (901) is fixedly connected to the left outer surface of the rectangular limiting block. The left outer surface of the circular connecting rod (901) is connected to the right outer surface of the oil filter assembly (5). A movable rod (905) is movably connected to the right outer surface of the rectangular limiting block. A spring (903) is sleeved on the outer wall of the movable rod (905). A circular piece (904) is fixedly connected to the right outer surface of the movable rod (905). A circular limiting block (902) is fixedly connected to the left outer surface of the movable rod (905). The circular limiting block (902) is located to the left of the rectangular limiting block. The oil pump assembly (202) includes a rectangular mounting box. An oil pump is fixedly connected to the inner cavity of the rectangular mounting box.

3. The automatic bending equipment for circular profiles according to claim 1, characterized in that: An oil inlet (204) is fixedly connected to the upper outer surface of the main body (203) of the lubricating oil tank. An oil delivery pipe (201) is fixedly connected to the left outer surface of the oil pump assembly (202). One end of the oil delivery pipe (201) is connected to the rectangular oil pipe (3). The oil outlet end of the nozzle (301) is located directly behind the rolling resistance screw (802). An inclined plate (801) is fixedly connected to the lower inner surface of the rectangular box (8). A rectangular oil outlet groove is opened in front of the lower inner surface of the rectangular box (8).

4. The automatic bending equipment for circular profiles according to claim 1, characterized in that: The inner surface of the rear end of the rectangular box (8) is provided with a first mounting groove that is compatible with the rectangular oil pipe (3). The rectangular box (8) is fixedly connected to the rectangular oil pipe (3) through the first mounting groove. The outer surface of the left side of the lubricating oil tank body (203) is provided with a second mounting groove that is compatible with the oil pump assembly (202). The lubricating oil tank body (203) is fixedly connected to the oil pump assembly (202) through the second mounting groove.

5. The automatic bending equipment for circular profiles according to claim 1, characterized in that: The upper outer surface of the lubricating oil tank body (203) is provided with a rectangular lower oil port that is adapted to the oil inlet (204). The lubricating oil tank body (203) is fixedly connected to the oil inlet (204) through the rectangular lower oil port.

6. The automatic bending equipment for circular profiles according to claim 1, characterized in that: The front outer surface of the oil filter assembly (5) is provided with a first limiting groove that is adapted to the coarse filter assembly (6). The oil filter assembly (5) is movably connected to the coarse filter assembly (6) through the first limiting groove. The front outer surface of the oil filter assembly (5) is provided with a second limiting groove that is adapted to the fine filter assembly (7). The oil filter assembly (5) is movably connected to the fine filter assembly (7) through the second limiting groove. The first limiting groove is located at the upper end of the second limiting groove.

7. The automatic bending equipment for circular profiles according to claim 2, characterized in that: The upper outer surface of the first mounting frame (601) is provided with a first rectangular mounting groove that is adapted to the first inner handle (603). The first mounting frame (601) is fixedly connected to the first inner handle (603) through the first rectangular mounting groove. The lower outer surface of the second mounting frame (701) is provided with a second rectangular mounting groove that is adapted to the second inner handle (703). The second mounting frame (701) is fixedly connected to the second inner handle (703) through the second rectangular mounting groove.

8. The automatic bending equipment for circular profiles according to claim 1, characterized in that: The rectangular box (8) has a first circular hole on its front outer surface that is compatible with the oil pipeline (201). The rectangular box (8) is fixedly connected to the oil pipeline (201) through the first circular hole.

9. The automatic bending equipment for circular profiles according to claim 2, characterized in that: The front end outer surface of the oil pump assembly (202) is provided with a second circular hole that is compatible with the oil delivery pipe (201). The oil pump assembly (202) is fixedly connected to the oil delivery pipe (201) through the second circular hole.

10. An automatic bending device for circular profiles according to claim 2, characterized in that: The oil pump has an oil inlet pipe fixedly connected to its inlet end. One end of the oil inlet pipe is located in the inner cavity of the lubricating oil tank body (203). The oil outlet end of the oil pump is connected to the oil delivery pipe (201).

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