A hydraulic bending apparatus, a hydraulic control system and a bending method

Abstract

The application discloses a hydraulic bending equipment, a hydraulic control system and a bending method, relates to the technical field of hydraulic bending, and comprises a mounting seat, a clamping assembly, a horizontal bending assembly and a vertical bending assembly. The horizontal bending assembly is used for bending one or two end heads of a traction coil in a horizontal direction until the two end heads of the traction coil are parallel to each other. The middle parts of the two end heads are defined by a limiting structure, and the limiting structure is formed by cooperation of the horizontal bending assembly and the mounting seat. The vertical bending assembly is used for simultaneously bending the two end heads defined by the limiting structure in a vertical direction until the extension directions of the two end heads are parallel to the vertical direction. The horizontal bending assembly and the vertical bending assembly are both driven by hydraulic pressure. The hydraulic bending equipment has a simple structure, and can complete two bending actions of horizontal bending and vertical bending only by once clamping, so that positioning errors are reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic bending technology, and more particularly to a hydraulic bending device, a hydraulic control system, and a bending method. The hydraulic bending device is specifically designed for use with traction coils of outdoor transmission units. Background Technology

[0002] The digital track circuit outdoor transmission unit is a new product based on the digital upgrade of the choke transformer. Its basic characteristics and production are consistent with the original choke transformer. Currently, there are two methods for bending the traction coil of the choke transformer: manual bending and mechanical bending. Manual bending has low production efficiency, while mechanical bending has problems such as complex operation and easy breakage of the coil end. Taking the patent with publication number CN217858548U as an example, the bending of the two ends of the coil is completed by two different bending components, and the horizontal bending and vertical bending are also independent of each other. The horizontal bending is carried out on the bending platform, and the vertical bending is carried out on the bending seat. Therefore, the coil needs to be positioned and installed twice, which increases the probability of positioning error. Furthermore, the vertical bending in this patent is done by clamping the end of the coil with a protrusion and a groove and then pressing it down directly through the bending plate. This bending method is likely to cause the end of the coil to break.

[0003] In conclusion, with economic development and rapid advancements in rail construction, national standards and regulations have become increasingly stringent. Existing methods and production processes are clearly inconvenient and outdated, urgently requiring improvement. Developing a coil bending machine that is small in size, easy to operate, stable in operation, low in production cost, and highly efficient is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] To address the technical problems of existing coil bending equipment, such as complex operation, large positioning errors, and easy coil breakage, this invention provides a hydraulic bending device, a hydraulic control system, and a bending method to solve the above problems.

[0005] This invention proposes a hydraulic bending device, including a mounting base, a clamping assembly, a horizontal bending assembly, and a vertical bending assembly. The mounting base is used to position a traction coil so that the axial direction of the traction coil is parallel to the vertical direction. The clamping assembly is used to press the traction coil axially. The horizontal bending assembly is used to bend one or both ends of the traction coil horizontally until the two ends of the traction coil are parallel to each other. At this time, the middle part of the two ends is limited by a limiting structure, and the limiting structure is formed by the cooperation of the horizontal bending assembly and the mounting base. The vertical bending assembly is used to simultaneously bend the two ends limited by the limiting structure vertically until the extension direction of the two ends is parallel to the vertical direction. Both the horizontal bending assembly and the vertical bending assembly are hydraulically driven.

[0006] In an optional embodiment of the invention, the horizontal bending assembly bends one end of the traction coil in a horizontal direction, making that end parallel to the other end.

[0007] In an optional embodiment of the present invention, the mounting base has a columnar groove for accommodating the traction coil, and the side of the columnar groove has an opening for the two ends of the traction coil to extend out. The horizontal bending assembly cooperates with the mounting base to form a first limiting structure for limiting the lower end of the traction coil. The first limiting structure includes a lower limit that fits against the lower surface of the lower end and a side plate that fits against the side of the lower end. The horizontal bending assembly bends the upper end of the traction coil in a horizontal direction.

[0008] In an optional embodiment of the present invention, the horizontal bending assembly includes a first hydraulic cylinder and a horizontal push rod. The front end of the horizontal push rod has a groove for inserting the upper end. One side wall of the opening is directly opposite the groove. When the upper end is parallel to the lower end, the groove and the side wall of the opening cooperate to form a second limiting structure that limits the upper end. The first limiting structure also includes an L-shaped plate located at the bottom of the horizontal push rod and in contact with the upper surface and side of the lower end.

[0009] In an optional embodiment of the present invention, the sidewall of the opening forming the second limiting structure is a plane, and the sidewall facing the columnar groove and the sidewall of the pressure groove facing the sidewall are both chamfered.

[0010] In an optional embodiment of the present invention, the horizontal bending assembly further includes a horizontal limiting block and a horizontal guide strip, the horizontal guide strip being slidably engaged with the bottom groove of the horizontal push rod, and the horizontal limiting block being in contact with the top surface and side surface of the horizontal push rod.

[0011] In an optional embodiment of the present invention, the vertical bending assembly includes a second hydraulic cylinder, a vertical push rod, and a vertical limiting block. The second hydraulic cylinder is connected to the vertical push rod, and the mounting base has a sliding groove that slides with the vertical push rod. The vertical push rod is located between the sliding groove and the vertical limiting block.

[0012] In an optional embodiment of the present invention, the vertical bending assembly bends the two ends from bottom to top, and the outer edge of the upper surface of the pressure groove, the inner edge of the upper surface of the vertical push rod, and the outer edge of the lower surface of the L-shaped plate are all chamfered.

[0013] This invention also proposes a hydraulic control system for controlling the start-up and shutdown of the horizontal bending assembly and the vertical bending assembly in the hydraulic bending equipment described above. The system includes an oil tank, a gear pump, an electromagnetic directional valve, and a solenoid valve. The electromagnetic directional valve is connected to the horizontal bending assembly and the vertical bending assembly in a one-to-one correspondence. One end of the gear pump is connected to the oil tank, and the other end is connected to the solenoid valve. The solenoid valve is connected to two electromagnetic directional valves. The two oil ports of the horizontal bending assembly and the two oil ports of the vertical bending assembly are respectively connected to the two ports of the corresponding electromagnetic directional valves.

[0014] The present invention also proposes a bending method, which uses the hydraulic bending equipment described above and includes the following steps: S1: The traction coil is fixed by a mounting base and clamping assembly.

[0015] S2: A horizontal bending assembly is used to bend the end of the traction coil horizontally, and the horizontal bending assembly cooperates with the mounting base to form a limiting structure that limits the middle of the end.

[0016] S3: The ends of the traction coil are vertically bent using a vertical bending assembly.

[0017] S4: Reset the vertical bending assembly and the horizontal bending assembly, loosen the clamping assembly, and remove the traction coil.

[0018] The beneficial effects of this invention are: (1) The hydraulic bending equipment described in this invention has a simple structure. Since the horizontal bending component can cooperate with the mounting base to limit the end, it only needs to be clamped once to complete the two bending actions of horizontal bending and vertical bending, thereby reducing positioning error and improving processing efficiency.

[0019] (2) The present invention uses one end of the traction coil as a reference, and only one end needs to be bent horizontally, thereby simplifying the structure of the horizontal bending assembly and reducing bending accuracy error.

[0020] (3) The present invention adopts a compact hydraulic drive, which reduces the space occupied by the equipment, and uses a hydraulic control system to control the start and stop of the horizontal bending component and the vertical bending component. The bending operation can be completed by simply pressing the electric control button, which reduces labor intensity. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of a traction coil bent using the hydraulic bending equipment described in this invention; Figure 2 This is a first-view perspective perspective view of the hydraulic bending device described in this invention; Figure 3yes Figure 2 Enlarged view of point a in the middle; Figure 4 This is a second-view perspective perspective view of the hydraulic bending device described in this invention; Figure 5 This is a front view of the hydraulic bending equipment described in this invention; Figure 6 This is a top view of the hydraulic bending equipment described in this invention; Figure 7 yes Figure 6 CC-direction sectional view; Figure 8 yes Figure 5 DD section view; Figure 9 This is a perspective view of the horizontal push rod in this invention; Figure 10 yes Figure 9 The front view of the horizontal push rod shown; Figure 11 This is a perspective view of the vertical push rod in this invention; Figure 12 This is a schematic diagram of the driving principle of the hydraulic control system described in this invention.

[0023] In the diagram, 1. Mounting base; 2. Clamping assembly; 201. Pressure plate; 202. Quick clamp; 3. Horizontal bending assembly; 301. First hydraulic cylinder; 302. Horizontal push rod; 303. Horizontal limit block; 304. Horizontal guide bar; 4. Vertical bending assembly; 401. Second hydraulic cylinder; 402. Vertical push rod; 403. Vertical limit block; 5. Traction coil; 501. Upper end; 502. Lower end; 6. Vertical bending point; 7. Columnar groove; 8. Opening; 9. First limiting structure; 901. Lower limiting plate; 902. Side plate; 903. L-shaped plate; 10. Second limiting structure; 10 01. Pressure groove; 1002. First sidewall; 11. Slide groove; 12. Bottom groove; 13. Pin hole; 14. Chamfer; 15. First surface; 16. Second surface; 17. Third surface; 18. Fourth surface; 19. Base plate; 20. Stud; 21. Gear pump; 22. Motor; 23. Oil tank; 24. Solenoid valve; 25. First solenoid directional valve; 26. Second solenoid directional valve; KY1. First coil; KY2. Second coil; KY3. Third coil; KY4. Fourth coil; KY5. Fifth coil; 27. Check valve; 28. Hydraulic lock; 29. ​​One-way throttle valve; 30. Relief valve. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figures 2-8 As shown, a hydraulic bending device includes a mounting base 1, a clamping assembly 2, a horizontal bending assembly 3, and a vertical bending assembly 4. The mounting base 1 is used to position a traction coil 5, making the axial direction of the traction coil 5 parallel to the vertical direction. The clamping assembly 2 is used to press the traction coil 5 axially. The horizontal bending assembly 3 is used to bend one or both ends of the traction coil 5 horizontally until the two ends of the traction coil 5 are parallel to each other. At this time, the middle part of the two ends is limited by a limiting structure, which is formed by the cooperation of the horizontal bending assembly 3 and the mounting base 1. The limiting structure limits the middle part of the ends in both the horizontal and vertical directions. The vertical bending assembly 4 is used to simultaneously bend the two ends limited by the limiting structure in the vertical direction until the extension direction of the two ends is parallel to the vertical direction. Both the horizontal bending assembly 3 and the vertical bending assembly 4 are hydraulically driven. Using hydraulic drive can make the structure more compact, reduce the equipment footprint, and improve the response speed.

[0026] like Figure 1 The diagram shows the structure of the traction coil 5, which can be bent using the hydraulic bending equipment described in this invention. The traction coil 5 has two protruding ends at both ends, which extend tangentially and are not parallel to each other. When bending, the two ends need to be bent horizontally until they are parallel to each other, and then bent vertically until they are parallel to the axial direction of the traction coil 5. The horizontal direction mentioned in this invention refers to the bending direction that can change the extension direction of the ends in a plane perpendicular to the axial direction of the traction coil 5, that is, the direction that has an angle with the extension direction of the ends in the horizontal plane, preferably the direction perpendicular to the extension direction of the ends.

[0027] For ease of description, the two ends of the traction coil 5 are named the upper end 501 and the lower end 502 respectively. When the traction coil 5 is placed on the mounting base 1, the upper end 501 is located at the top.

[0028] Since the position of the end of the traction coil 5 changes after horizontal bending, it is necessary to limit the middle of the end after horizontal bending. This limiting point is the vertical bending point 6. Only then can vertical bending be performed along the vertical bending point 6. In traditional bending equipment, the end of the traction coil 5 is often placed in a fixed clamping structure by transferring the traction coil 5, which makes the operation process complicated. This invention uses the structure of the horizontal bending component 3 itself and the mounting base 1 to form a limiting structure for limiting the end, so that it is not necessary to transfer the traction coil 5. After horizontal bending, vertical bending can be performed directly, resulting in higher processing accuracy and improved product size consistency.

[0029] Furthermore, in this invention, the horizontal bending component 3 can bend both ends horizontally at once, and the vertical bending component 4 can bend both ends vertically at once, thus simplifying the bending equipment.

[0030] It should be noted that the horizontal bending component 3 in this invention can bend both ends simultaneously or only one end. When bending both ends simultaneously, it means bending both ends to the same parallel line. The case of bending only one end will be described in detail in the following embodiments.

[0031] The bending method of the hydraulic bending equipment of the present invention includes the following steps: S1: The traction coil 5 is fixed by mounting base 1 and clamping assembly 2.

[0032] S2: The end of the traction coil 5 is bent horizontally by the horizontal bending component 3, and the horizontal bending component 3 cooperates with the mounting base 1 to form a limiting structure that limits the middle of the end.

[0033] S3: The ends of the traction coil 5 are vertically bent using the vertical bending assembly 4.

[0034] S4: Reset the vertical bending assembly 4 and the horizontal bending assembly 3, loosen the clamping assembly 2, and remove the traction coil 5.

[0035] Example 1 like Figures 2-4 As shown, a hydraulic bending device includes a mounting base 1, a clamping assembly 2, a horizontal bending assembly 3, and a vertical bending assembly 4. Both the horizontal bending assembly 3 and the vertical bending assembly 4 are hydraulically driven.

[0036] Mounting base 1 is used to position traction coil 5, ensuring that the axial direction of traction coil 5 is parallel to the vertical direction. The upper end 501 of traction coil 5 is located at the top, and the lower end 502 is located at the bottom. Clamping assembly 2 is used to press traction coil 5 axially. In this embodiment, the bending scheme is to use the lower end 502 as a reference and bend the upper end 501 horizontally. The horizontal bending assembly 3 bends the upper end 501 until it is parallel to the lower end 502.

[0037] The mounting base 1 and the clamping assembly 2 work together to fix the traction coil 5. The fixing mainly refers to fixing the columnar body of the traction coil 5 without affecting the bending deformation of the end.

[0038] The lower end 502 can be limited by the horizontal bending assembly 3 cooperating with the mounting base 1, or it can be directly formed on the mounting base 1. In this embodiment, the horizontal bending assembly 3 and the mounting base 1 cooperate to form a first limiting structure 9 that limits the lower end 502 of the traction coil 5 and a second limiting structure 10 that limits the upper end 501. The second limiting structure 10 limits the upper end 501 in both the horizontal and vertical directions, and the first limiting structure 9 limits the lower end 502 in both the horizontal and vertical directions. The horizontal limiting is to limit the horizontal bending endpoint of the end, and the vertical limiting is to limit the vertical bending point 6 of the end.

[0039] The first limiting structure 9 is preferably a frame-shaped structure surrounding the lower end 502, and the second limiting structure 10 is preferably a frame-shaped structure surrounding the upper end 501.

[0040] Mounting base 1 may, but is not limited to, adopting the following structure: Mounting base 1 has a columnar groove 7 for accommodating traction coil 5, the columnar groove 7 surrounding the outer periphery of traction coil 5, and the side of the columnar groove 7 having openings 8 for the two ends of traction coil 5 to extend out. The first limiting structure 9 includes a lower limiting plate 901 that abuts against the lower surface of the lower end 502 and a side plate 902 that abuts against the side of the lower end 502. Figure 3 and Figure 7 As shown, the lower limit plate 901 is the base plate of the mounting base 1, which is used to position the lower surface of the lower end head 502, and the side plate 902 is used to position one side of the lower end head 502.

[0041] For the movement of the horizontal bending component 3 and the vertical bending component 4, the end of the traction coil 5 is usually driven by linear motion. This linear motion can be driven directly by the driving component, or it can be achieved by a transmission structure such as a gear rack, a lead screw and nut. When hydraulic drive is used, the most conventional hydraulic cylinder can be connected to the push rod. The specific structure is as follows.

[0042] Horizontal bending component 3: like Figures 4-7As shown, the horizontal bending assembly 3 includes a first hydraulic cylinder 301 and a horizontal push rod 302. The first hydraulic cylinder 301 drives the horizontal push rod 302 to reciprocate linearly. The front end of the horizontal push rod 302 has a groove 1001 for inserting the upper end head 501. One side wall of the opening 8 is directly opposite the groove 1001. When the upper end head 501 is parallel to the lower end head 502, the groove 1001 and the side wall of the opening 8 cooperate to form a second limiting structure 10 that limits the upper end head 501. The first limiting structure 9 also includes an L-shaped plate 903 located at the bottom of the horizontal push rod 302 and in contact with the upper surface and side surface of the lower end head 502. Figure 3 , Figure 4 and Figure 7 As shown, the sidewall of the opening 8 directly opposite the pressure groove 1001 is the first sidewall 1002. When the horizontal push rod 302 extends and reaches the upper end 501, the side of the upper end 501 inserts into the pressure groove 1001, and the horizontal push rod 302 pushes the upper end 501 from the side, causing it to bend and deform only in the horizontal direction. When the horizontal push rod 302 abuts against the first sidewall 1002, the pressure groove 1001 and the first sidewall 1002 form a frame structure. The L-shaped plate 903 is integrally formed with the horizontal push rod 302. When the horizontal push rod 302 abuts against the first sidewall 1002, the L-shaped plate 903, the lower limit plate 901, and the side plate 902 also form a frame structure, that is... Figure 7 The top surface of the lower limit plate 901, the right side surface of the side plate 902, and the horizontal and vertical surfaces of the L-shaped plate 903 together form a frame structure.

[0043] The first sidewall 1002 is preferably a plane parallel to the extending direction of the lower end 502. When the upper end 501 is bent to fit against the first sidewall 1002, the upper end 501 is parallel to the lower end 502.

[0044] Vertical bending component 4: The vertical bending assembly 4 includes a second hydraulic cylinder 401, a vertical push rod 402, and a vertical limiting block 403. The second hydraulic cylinder 401 is connected to the vertical push rod 402. The mounting base 1 has a sliding groove 11 that slides with the vertical push rod 402. The vertical push rod 402 is located between the sliding groove 11 and the vertical limiting block 403. Figure 6 and Figure 8 As shown, the slide groove 11 extends vertically, and the vertical limiting block 403 is used to press down on the outer side of the vertical push rod 402, so that the vertical push rod 402 will not disengage from the slide groove 11, ensuring the straightness of the translation of the vertical push rod 402. In this invention, the "outer side" of each component refers only to the side of the component facing away from the columnar groove 7, and the "inner side" refers to the side of the component facing the columnar groove 7. The vertical bending assembly 4 bends the two ends from bottom to top.

[0045] In a further design, a base plate 19 is provided below the mounting base 1, and the second hydraulic cylinder 401 is placed on the base plate 19. The base plate 19 and the mounting base 1 can be fixed by studs 20.

[0046] Clamping component 2: The clamping assembly 2 is used to press the traction coil 5 downward in a vertical direction, and may include, but is not limited to, a pressure plate 201 and multiple quick clamps 202. The pressure plate 201 is placed on top of the traction coil 5, and the quick clamps 202 are fixed on the mounting base 1, with the clamps of the quick clamps 202 pressing against the pressure plate 201.

[0047] The bending method of the hydraulic bending equipment described in this embodiment includes the following steps: S1: The traction coil 5 is fixed using the mounting base 1 and the clamping assembly 2. First, the traction coil 5 is placed in the columnar groove 7 of the mounting base 1, so that the lower end 502 is located in the receiving groove 901. At this time, the lower end 502 is located in the first limiting structure 9. Then, the pressure plate is placed on top of the traction coil 5, and finally, the quick clamp 202 is used to clamp it.

[0048] S2: The upper end 501 of the traction coil 5 is bent horizontally by the horizontal bending component 3, and the horizontal bending component 3 cooperates with the mounting base 1 to form a second limiting structure 10 that limits the middle part of the upper end 501.

[0049] S3: The upper end 501 and lower end 502 of the traction coil 5 are vertically bent using the vertical bending assembly 4.

[0050] S4: Reset the vertical bending assembly 4 and the horizontal bending assembly 3, loosen the clamping assembly 2, and remove the traction coil 5.

[0051] Example 2 Based on the above embodiments, to ensure the straightness of the translation of the horizontal push rod 302, as follows: Figure 4 , Figure 5 and Figure 9 As shown, the horizontal bending assembly 3 also includes a horizontal limiting block 303 and a horizontal guide strip 304. The horizontal guide strip 304 slides in conjunction with the bottom groove 12 of the horizontal push rod 302, and the horizontal limiting block 303 is in contact with the top and side surfaces of the horizontal push rod 302. The horizontal guide strip 304 extends within the translational stroke range of the horizontal push rod 302 and has a clearance gap (such as...) above the lower end 502. Figure 3 As shown, there are two separated horizontal guide bars 304. The horizontal guide bars 304 are used to guide the horizontal push rod 302. The horizontal limiting block 303 is used to press the horizontal push rod 302 in the vertical direction and at the same time stabilize the horizontal push rod 302 laterally to prevent the horizontal push rod 302 from shaking.

[0052] In further design, such as Figure 4 and Figure 9 As shown, the horizontal push rod 302 and the mounting base 1 can be provided with corresponding pin holes 13. When the upper end 501 is bent into place horizontally, the two pin holes 13 are connected by a positioning pin to fix the horizontal bending assembly 3 to the mounting base 1.

[0053] Example 3 Based on the above embodiments, to avoid excessive stress concentration at the bending points of the ends during bending, which could cause end breakage, this embodiment provides chamfers 14 at the bending points of both the horizontal bending assembly 3 and the vertical bending assembly 4. Specifically, this includes anti-breakage measures for the horizontal bending point of the upper end 501 and anti-breakage measures for the two vertical bending points 6 of the ends. The anti-breakage measures for the horizontal bending point of the upper end 501 are as follows: Figure 4 , Figure 6 and Figure 9 As shown, the surface of the pressure groove 1001 facing the first sidewall 1002 is the first surface 15. The side of the first sidewall 1002 facing the columnar groove 7 and both sides of the first surface 15 are provided with chamfers 14. The anti-breakage measures for the two vertical bending points 6 at the ends are as follows: Figures 8-11 As shown, the upper surface of the pressure groove 1001 is the second surface 16, the upper surface of the vertical push rod 402 is the third surface 17, and the lower surface of the L-shaped plate 903 is the fourth surface 18. The outer edges of the second surface 16, the inner edges of the third surface 17, and the outer edges of the fourth surface 18 are all chamfered 14. These chamfers 14 prevent stress concentration caused by contact between the bent end and the right-angled edges.

[0054] Example 4 A hydraulic control system is provided for controlling the start-up and shutdown of the horizontal bending assembly 3 and the vertical bending assembly 4 in the hydraulic bending equipment described above. The system includes an oil tank 23, a gear pump 21, a solenoid directional valve, and a solenoid valve 24. The solenoid directional valve is connected to the horizontal bending assembly 3 and the vertical bending assembly 4 in a one-to-one correspondence. For ease of description, the solenoid directional valve connected to the first hydraulic cylinder 301 is named the first solenoid directional valve 25, and the solenoid directional valve connected to the second hydraulic cylinder 401 is named the second solenoid directional valve 26.

[0055] like Figure 12 As shown, the gear pump 21 is driven to rotate by the motor 22. One end of the gear pump 21 is connected to the oil tank 23 and the other end is connected to the solenoid valve 24. The outlet of the solenoid valve 24 is connected to both the first solenoid directional valve 25 and the second solenoid directional valve 26. The two oil ports of the first hydraulic cylinder 301 are respectively connected to the first solenoid directional valve 25, and the two oil ports of the second hydraulic cylinder 401 are respectively connected to the two ports of the second solenoid directional valve 26.

[0056] In this embodiment, both the first electromagnetic directional valve 25 and the second electromagnetic directional valve 26 are three-position five-way electromagnetic directional valves. The first electromagnetic directional valve 25 controls different operating states by switching on and off the first coil KY1 and the second coil KY2. The second electromagnetic directional valve 26 controls different operating states by switching on and off the third coil KY3 and the fourth coil KY4. The electromagnetic valve 24 controls the opening and closing of the pipeline by switching on and off the fifth coil KY5. In a preferred embodiment, a check valve 27 is provided at the outlet of the gear pump 21. A hydraulic lock 28 and a one-way throttle valve 29 are also connected between the electromagnetic directional valves and the hydraulic cylinder. The hydraulic lock 28 is used to precisely lock the hydraulic cylinder at any position when the oil circuit is cut off, and to prevent it from drifting or settling due to external forces (such as gravity or load). An overflow valve 30 is also provided at the outlet of the gear pump 21 to protect the motor 22. When the cylinder stroke is in place, the overflow valve 30 works to keep the motor 22 working at the set output force, preventing the motor 22 from stalling. At the same time, it limits the output force of the cylinder.

[0057] Taking the first hydraulic cylinder 301 as an example, the principle of hydraulic control is as follows (the control of the second hydraulic cylinder 401 is similar): the motor 22 rotates, driving the gear pump 21 to rotate, generating negative pressure. The hydraulic oil in the oil tank 23 will be drawn into the gear pump 21. The gear pump 21 has the advantage of high anti-pollution. The hydraulic pressure oil flows to the first solenoid directional valve 25 through the one-way valve 27. The extension and retraction of the first hydraulic cylinder 301 are controlled by controlling the first coil KY1 and the second coil KY2 on the left and right sides of the first solenoid directional valve 25.

[0058] The first hydraulic cylinder 301 extends: When the first coil KY1 and the fifth coil KY5 are energized, pressurized oil flows from the one-way valve 27 in the hydraulic lock 28 to port A of the one-way throttle valve 29, and then to the rodless chamber of the first hydraulic cylinder 301. At this time, the piston rod in the first hydraulic cylinder 301 extends. The hydraulic oil in the rod chamber flows back to the one-way throttle valve 29 through port B. The extension speed of the piston rod can be adjusted by changing the size of the throttle opening 8. The hydraulic oil then flows back to the oil tank 23 through the hydraulic lock 28 and the first solenoid directional valve 25.

[0059] The second hydraulic cylinder 401 retracts: When the second coil KY2 and the fifth coil KY5 are energized, the pressure oil flows from the hydraulic lock 28 to the oil port B of the one-way throttle valve 29, and then flows to the rod chamber in the second hydraulic cylinder 401. At this time, the piston rod retracts; the hydraulic oil in the rodless chamber flows back to the one-way throttle valve 29 through the oil port A, and then flows back to the oil tank 23 through the hydraulic lock 28 and the first solenoid directional valve 25.

[0060] The fifth coil KY5 is de-energized, and motor 22 and pump are unloaded.

[0061] The hydraulic control system allows for direct control of horizontal and vertical bending via electronic buttons, reducing labor intensity. Furthermore, the use of the electromagnetic directional valve in conjunction with the electromagnetic valve 24 prevents lag in the movement of the first hydraulic cylinder 301 and the second hydraulic cylinder 401, eliminating the need for frequent starting of the gear pump 21.

[0062] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0063] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0064] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0065] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic bending device, characterized in that, include: Mounting base is used to position the traction coil so that the axial direction of the traction coil is parallel to the vertical direction; Clamping assembly for axially clamping the traction coil; A horizontal bending assembly is used to bend one or both ends of a traction coil in a horizontal direction until the two ends of the traction coil are parallel to each other. At this time, the middle part of the two ends is limited by a limiting structure, and the limiting structure is formed by the horizontal bending assembly and the mounting base. A vertical bending assembly for simultaneously bending two ends defined by a limiting structure in a vertical direction until the extending directions of the two ends are parallel to the vertical direction; Both the horizontal bending assembly and the vertical bending assembly are hydraulically driven. The horizontal bending assembly bends one end of the traction coil horizontally, making that end parallel to the other end. The mounting base has a columnar groove for accommodating the traction coil, and the side of the columnar groove has openings for the two ends of the traction coil to extend out. The horizontal bending assembly cooperates with the mounting base to form a first limiting structure that limits the lower end of the traction coil. The first limiting structure includes a lower limit that fits against the lower surface of the lower end and a limit that fits against the side surface of the lower end. The side plate of the traction coil is combined, and the horizontal bending assembly bends the upper end of the traction coil in the horizontal direction. The horizontal bending assembly includes a first hydraulic cylinder and a horizontal push rod. The front end of the horizontal push rod has a pressure groove for the upper end to be inserted. One side wall of the opening is directly opposite the pressure groove. When the upper end is parallel to the lower end, the pressure groove and the side wall of the opening cooperate to form a second limiting structure for limiting the upper end. The first limiting structure also includes an L-shaped plate located at the bottom of the horizontal push rod and in contact with the upper surface and side of the lower end.

2. The hydraulic bending equipment according to claim 1, characterized in that: The sidewall of the opening forming the second limiting structure is flat, and the sidewall facing the columnar groove and the sidewall of the pressure groove facing the sidewall are both chamfered.

3. The hydraulic bending equipment according to claim 1, characterized in that: The horizontal bending assembly also includes a horizontal limiting block and a horizontal guide strip. The horizontal guide strip slides in conjunction with the bottom groove of the horizontal push rod, and the horizontal limiting block is in contact with the top and side surfaces of the horizontal push rod.

4. The hydraulic bending equipment according to claim 1, characterized in that: The vertical bending assembly includes a second hydraulic cylinder, a vertical push rod, and a vertical limiting block. The second hydraulic cylinder is connected to the vertical push rod, and the mounting base has a sliding groove that slides with the vertical push rod. The vertical push rod is located between the sliding groove and the vertical limiting block.

5. The hydraulic bending equipment according to claim 4, characterized in that: The vertical bending assembly bends the two ends from bottom to top, and the outer edge of the upper surface of the pressure groove, the inner edge of the upper surface of the vertical push rod, and the outer edge of the lower surface of the L-shaped plate are all chamfered.

6. A hydraulic control system, characterized in that: The control system is used to control the start and stop of the horizontal bending component and the vertical bending component in the hydraulic bending equipment according to any one of claims 1-5, and includes an oil tank, a gear pump, an electromagnetic directional valve, and a solenoid valve. The electromagnetic directional valve is connected to the horizontal bending component and the vertical bending component in a one-to-one correspondence. One end of the gear pump is connected to the oil tank and the other end is connected to the solenoid valve. The solenoid valve is connected to two electromagnetic directional valves. The two oil ports of the horizontal bending component and the two oil ports of the vertical bending component are respectively connected to the two ports of the corresponding electromagnetic directional valves.

7. A bending method, characterized in that: The method employs the hydraulic bending equipment described in any one of claims 1-5, and includes the following steps: S1: The traction coil is fixed using a mounting base and clamping assembly; S2: A horizontal bending assembly is used to bend the end of the traction coil horizontally, and the horizontal bending assembly cooperates with the mounting base to form a limiting structure that limits the middle of the end. S3: The end of the traction coil is vertically bent using a vertical bending assembly; S4: Reset the vertical bending assembly and the horizontal bending assembly, loosen the clamping assembly, and remove the traction coil.

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