A hydraulic control system for a friction welding machine of aluminum guide rods and steel claws

Abstract

The present invention relates to the technical field of friction welding, and more specifically, to a hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw. It includes a welding device, an oil supply device, a driving device, a clamping device and a moving device. The welding device is connected to the driving device, and the driving device, the clamping device and the moving device are all connected to the oil supply device; the oil supply device includes an oil tank, a hydraulic pump, a main oil supply pipeline and a main oil return pipeline. The main oil supply pipeline is connected to the hydraulic pump, and the main oil return pipeline is communicated with the oil tank; the welding device includes a frame, an upper main pressure oil cylinder and a lower main pressure oil cylinder. The hydraulic rods of the upper main pressure oil cylinder and the lower main pressure oil cylinder are arranged oppositely. There are two driving devices, and the two driving devices are respectively connected to the upper main pressure oil cylinder and the lower main pressure oil cylinder. There are two clamping devices, and the two clamping devices are arranged oppositely. The present invention has reliable performance and stable operation, and is suitable for friction welding of large-section aluminum-iron parts.

Description

Technical Field

[0001] The present invention relates to the technical field of friction welding, and more specifically, to a hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw. Background Art

[0002] Friction welding refers to a welding method that uses the heat generated by the friction of the workpiece contact surface as the heat source to cause plastic deformation of the workpiece under pressure for welding.

[0003] At present, most of the aluminum-iron friction welding equipment on the market is for welding aluminum and iron with small cross-sections. For the welding of aluminum and iron with a cross-section larger than 140mm * 140mm, the existing equipment on the market cannot complete it.

[0004] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0005] In order to overcome the deficiencies in the prior art, a hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw suitable for friction welding of large cross-section workpieces is provided.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw includes a welding device, an oil supply device, a driving device, a clamping device and a moving device. The welding device is connected to the driving device, and the driving device, the clamping device and the moving device are all connected to the oil supply device;

[0008] The oil supply device includes an oil tank, a hydraulic pump, a main oil supply pipeline and a main oil return pipeline. The main oil supply pipeline is connected to the hydraulic pump, and the main oil return pipeline is communicated with the oil tank;

[0009] The welding device includes a frame, an upper main pressure oil cylinder and a lower main pressure oil cylinder. The hydraulic rods of the upper main pressure oil cylinder and the lower main pressure oil cylinder are arranged oppositely. There are two driving devices, and the two driving devices are respectively connected to the upper main pressure oil cylinder and the lower main pressure oil cylinder. There are two clamping devices, and the two clamping devices are arranged oppositely.

[0010] Further, it further includes a brake device. The brake device includes an electromagnetic directional valve I, a stacked hydraulic control check valve, a left brake oil cylinder, a right brake oil cylinder and a voltage stabilizing device. The oil inlet and outlet of the electromagnetic directional valve I are respectively communicated with the main oil supply pipeline and the main oil return pipeline of the oil supply device. The two working ports of the electromagnetic directional valve I are respectively communicated with the stacked hydraulic control check valve. The left brake oil cylinder and the right brake oil cylinder are arranged in parallel and communicated with the stacked hydraulic control check valve. The voltage stabilizing device is communicated with the rodless cavities of the left brake oil cylinder and the right brake oil cylinder.

[0011] Furthermore, the hydraulic pump is connected to a shock-absorbing motor. A high-pressure oil filter and a direction valve are sequentially arranged between the hydraulic pump and the main oil supply pipeline, and a pressure regulating valve group is arranged between the high-pressure oil filter and the main oil supply pipeline.

[0012] Furthermore, the hydraulic pump includes a piston pump and a vane pump. The pressure regulating valve group in the oil circuit where the piston pump is located is a high-pressure pressure regulating valve group, and the pressure regulating valve group in the oil circuit where the vane pump is located is a low-pressure pressure regulating valve group.

[0013] Furthermore, the high-pressure pressure regulating valve group includes cartridge valve I, relief valve I, relief valve II, and solenoid directional valve II. The main oil port A of the cartridge valve I is communicated with the main oil port A of the direction valve. The control oil ports of the cartridge valve I are respectively communicated with the inlet oil ports of the relief valve I, the relief valve II, and the solenoid directional valve II. The outlet oil port of the relief valve I is communicated with the working port of the solenoid directional valve II. The main oil port B of the cartridge valve I, the oil return port of the solenoid directional valve II, and the outlet oil port of the relief valve II are all communicated with the main oil return pipeline;

[0014] The low-pressure pressure regulating valve group includes cartridge valve II, relief valve III, and solenoid directional valve III. The main oil port A of the cartridge valve II is communicated with the main oil port A of the direction valve. The control oil ports of the cartridge valve II are respectively communicated with the inlet oil ports of the relief valve III and the solenoid directional valve III. The main oil port B of the cartridge valve II, the oil return port of the solenoid directional valve III, and the outlet oil port of the relief valve III are all communicated with the main oil return pipeline.

[0015] Furthermore, the driving device includes an oil supply mechanism and a control mechanism. The oil supply mechanism includes the first cartridge valve, the second cartridge valve, the third cartridge valve, and the fourth cartridge valve. The main oil port B of the first cartridge valve is communicated with the main oil supply pipeline, and the main oil port B of the fourth cartridge valve is communicated with the main oil return pipeline. The main oil port B of the first cartridge valve and the second cartridge valve, the main oil port A of the second cartridge valve and the third cartridge valve, the main oil port B of the third cartridge valve and the fourth cartridge valve, and the main oil port A of the fourth cartridge valve and the first cartridge valve are sequentially communicated. The main oil port A of the first cartridge valve is communicated with the rodless cavity of the upper main pressure oil cylinder. A sequence valve is arranged on the pipeline where the main oil port A of the first cartridge valve is communicated with the rodless cavity of the upper main pressure oil cylinder. The main oil port A of the second cartridge valve is communicated with the rodless cavity of the upper main pressure oil cylinder;

[0016] The control mechanism includes a first electromagnetic reversing valve, a second electromagnetic reversing valve, and a third electromagnetic reversing valve. The oil inlets of the first electromagnetic reversing valve, the second electromagnetic reversing valve, and the third electromagnetic reversing valve are all unidirectionally connected to the main oil port A, the main oil port B of the first cartridge valve, and the main oil port A of the second cartridge valve. The oil return ports of the first electromagnetic reversing valve, the second electromagnetic reversing valve, and the third electromagnetic reversing valve are all connected to the main oil return pipeline. The working port of the first electromagnetic reversing valve is connected to the control oil port of the second cartridge valve. The working port of the third electromagnetic reversing valve is connected to the control oil port of the fourth cartridge valve. The working port of the second electromagnetic reversing valve is respectively connected to the control oil ports of the first cartridge valve and the third cartridge valve.

[0017] Further, the driving device further includes a pressure regulating mechanism. The pressure regulating mechanism includes a main valve, a switching valve, and a fourth electromagnetic reversing valve. Both the main valve and the switching valve are cartridge valves. The main oil port A of the switching valve is connected to the main oil port A of the second cartridge valve. The main oil port A of the main valve is connected to the main oil port B of the switching valve. The main oil port B of the main valve is connected to the main oil port B of the third cartridge valve. A proportional overflow valve is provided between the control oil port of the main valve and the oil return port of the fourth electromagnetic reversing valve. The working port of the fourth electromagnetic reversing valve is connected to the control port of the switching valve. The oil inlet of the fourth electromagnetic reversing valve is unidirectionally connected to the main oil port A, the main oil port B of the first cartridge valve, and the main oil port A of the second cartridge valve.

[0018] Further, the clamping device includes a solenoid reversing valve Ⅳ, a stacked pilot-operated check valve Ⅰ, a stacked one-way throttle valve Ⅰ, and a clamping cylinder that are connected in sequence. The oil inlet and the oil outlet of the solenoid reversing valve Ⅳ are respectively connected to the main oil supply pipeline and the main oil return pipeline.

[0019] Further, the moving device includes a solenoid reversing valve Ⅴ, a stacked pilot-operated check valve Ⅱ, a stacked one-way throttle valve Ⅱ, and a positioning cylinder that are connected in sequence. The oil inlet and the oil outlet of the solenoid reversing valve Ⅴ are respectively connected to the main oil supply pipeline and the main oil return pipeline.

[0020] Further, a pressure gauge is provided between the high-pressure oil filter and the direction valve, and a pressure transmitter and a pressure gauge are provided on the main oil supply pipeline.

[0021] The beneficial effects of the present invention compared with the prior art are as follows:

[0022] 1. The oil supply device of the present invention provides low-pressure oil through a vane pump and a low-pressure pressure regulating valve group, and provides high-pressure oil through a plunger pump and a high-pressure pressure regulating valve group, which can meet the multi-level oil pressure requirements of the hydraulic control system.

[0023] 2. The hydraulic cylinder driving device of the present invention is composed of four cartridge valves and three solenoid valves. The extension and contraction movements of the hydraulic cylinder are realized by switching the solenoid valves, and the pressure of the hydraulic rod is changed to keep the pressure between the steel claws and the aluminum guide rod constant when in the friction state through the pressure regulating mechanism.

[0024] 3. The present invention is provided with a moving device, a clamping device and a brake device, and controls multiple hydraulic devices through a set of hydraulic control systems, with a compact structure and reasonable design.

[0025] 4. The present invention uses multiple cartridge valves as control valves and switching valves, which can achieve high-power control, with small pressure loss, little heat generation, and high switching reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following will further elaborate on the specific embodiments of the present invention with reference to the drawings.

[0027] Figure 1 It is the schematic diagram of the hydraulic control system of the present invention;

[0028] Figure 2 It is the hydraulic schematic diagram of the driving device of the present invention;

[0029] Figure 3 It is the hydraulic schematic diagram of the clamping device of the present invention;

[0030] Figure 4 It is the hydraulic schematic diagram of the moving device of the present invention;

[0031] Figure 5 It is the hydraulic schematic diagram of the brake device of the present invention;

[0032] Figure 6 It is the hydraulic schematic diagram of the pressure regulating valve group of the present invention.

[0033] In the figure: 1 - welding device, 11 - frame, 12 - upper main pressing oil cylinder, 13 - lower main pressing oil cylinder, 2 - oil supply device, 21 - oil tank, 22 - main oil supply pipeline, 23 - main oil return pipeline, 24 - shock-absorbing motor, 25 - high-pressure oil filter, 26 - direction valve, 27 - pressure regulating valve group, 271 - cartridge valve I, 272 - overflow valve I, 273 - overflow valve II, 274 - electromagnetic reversing valve II, 275 - cartridge valve II, 276 - overflow valve III, 277 - electromagnetic reversing valve III, 28 - plunger pump, 29 - vane pump, 3 - driving device, 311 - first cartridge valve, 312 - second cartridge valve, 313 - third cartridge valve, 314 - fourth cartridge valve, 315 - sequence valve, 321 - first electromagnetic reversing valve, 322 - second electromagnetic reversing valve, 323 - third electromagnetic reversing valve, 331 - main valve, 332 - switch valve, 333 - fourth electromagnetic reversing valve, 334 - proportional overflow valve, 4 - clamping device, 41 - electromagnetic reversing valve IV, 42 - stacked pilot-operated check valve I, 43 - stacked one-way throttle valve I, 44 - clamping oil cylinder, 5 - moving device, 51 - electromagnetic reversing valve V, 52 - stacked pilot-operated check valve II, 53 - stacked one-way throttle valve II, 54 - positioning oil cylinder, 6 - brake device, 61 - electromagnetic reversing valve I, 62 - stacked pilot-operated check valve, 63 - left brake oil cylinder, 64 - right brake oil cylinder, 65 - voltage stabilizing device. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0035] As Figures 1 to 6 shown, a hydraulic control system for a friction welding aluminum guide rod and steel claw welding machine includes a welding device 1, an oil supply device 2, a driving device 3, a clamping device 4, a moving device 5 and a brake device 6. The welding device 1 is connected to the driving device 3. The driving device 3, the clamping device 4, the moving device 5 and the brake device 6 are all connected to the oil supply device 2. The oil supply device 2 provides pressure oil for the driving device 3, the clamping device 4, the moving device 5 and the brake device 6. The driving device 3 drives the welding device 1 to perform pressure welding. The moving device 5 is used to move the workpiece to be welded onto the welding device 1. The clamping device 4 is used to clamp the workpiece to be welded. The brake device 6 is used for the emergency stop of the rotating component.

[0036] The oil supply device 2 includes an oil tank 21, a plunger pump 28, a vane pump 29, a main oil supply pipeline 22 and a main oil return pipeline 23. The plunger pump 28 and the vane pump 29 are both connected with a shock-absorbing motor 24. The plunger pump 28 and the vane pump 29 are connected to the main oil supply pipeline 22. A high-pressure oil filter 25 and a direction valve 26 are sequentially arranged between the plunger pump 28, the vane pump 29 and the main oil supply pipeline 22. The direction valve 26 adopts a cartridge valve. The main oil port B of the direction valve 26 is communicated with the control oil port. The main oil return pipeline 23 is communicated with the oil tank 21. A pressure regulating valve group 27 is arranged between the high-pressure oil filter 25 and the main oil supply pipeline 22.

[0037] The pressure regulating valve group 27 is divided into a low-pressure pressure regulating valve group and a high-pressure pressure regulating valve group. The pressure regulating valve group in the oil circuit where the plunger pump 28 is located is the high-pressure pressure regulating valve group, and the pressure regulating valve group in the oil circuit where the vane pump 29 is located is the low-pressure pressure regulating valve group.

[0038] The high-pressure pressure regulating valve group includes a cartridge valve I 271, a relief valve I 272, a relief valve II 273 and a solenoid directional valve II 274. The main oil port A of the cartridge valve I 271 is communicated with the main oil port A of the direction valve. The control oil port of the cartridge valve I 271 is respectively communicated with the oil inlets of the relief valve I 272, the relief valve II 273 and the solenoid directional valve II 274. The oil outlet of the relief valve I 272 is communicated with the working port of the solenoid directional valve II 274. The main oil port B of the cartridge valve I 271, the oil return port of the solenoid directional valve II 274 and the oil outlet of the relief valve II 273 are all communicated with the main oil return pipeline 23.

[0039] The set pressure of the relief valve I 272 is less than the set pressure of the relief valve II 273. In this embodiment: the set pressure P1 of the relief valve I 272 = 12 MPa, and the set pressure P2 of the relief valve II 273 = 20 MPa.

[0040] The solenoid directional valve II 274 is a three-position four-way directional valve. When the solenoid directional valve II 274 is in the middle position, the cartridge valve I 271 is opened, the oil supply pipeline is communicated with the oil return pipeline, and the plunger pump does not supply oil to the main oil supply pipeline. When the solenoid directional valve II 274 is in the left position, the relief valve I 272 is communicated with the oil return pipeline, and the maximum oil supply pressure of the plunger pump is the set pressure of the relief valve I 272. When the solenoid directional valve II 274 is in the right position, the relief valve I 272 is disconnected from the oil return pipeline, and the maximum oil supply pressure of the plunger pump is the set pressure of the relief valve II 273.

[0041] The low-pressure pressure regulating valve group includes a cartridge valve II 275, a relief valve III 276 and a solenoid directional valve III 277. The main oil port A of the cartridge valve II 275 is communicated with the main oil port A of the direction valve. The control oil port of the cartridge valve II 275 is respectively communicated with the oil inlets of the relief valve III 276 and the solenoid directional valve III 277. The main oil port B of the cartridge valve II 275, the oil return port of the solenoid directional valve III 277 and the oil outlet of the relief valve III 276 are all communicated with the main oil return pipeline 23.

[0042] The set pressure of the overflow valve Ⅲ 276 is less than that of the overflow valve Ⅰ 272. In this embodiment: the set pressure P3 of the overflow valve Ⅲ 276 is 8 MPa. When the electromagnetic directional valve Ⅲ 277 is in the left position, the oil supply pipeline is connected to the oil return pipeline, and the vane pump does not supply oil to the main oil supply pipeline. When the electromagnetic directional valve Ⅲ 277 is in the right position, the oil supply pipeline is disconnected from the oil return pipeline, and the maximum oil supply pressure of the vane pump 29 is the set pressure of the overflow valve Ⅲ 276.

[0043] A pressure gauge is provided between the high-pressure oil filter 25 and the directional valve 26.

[0044] The driving device 3 includes an oil supply mechanism, a control mechanism, and a pressure regulating mechanism. The oil supply mechanism includes a first cartridge valve 311, a second cartridge valve 312, a third cartridge valve 313, and a fourth cartridge valve 314. The main oil port B of the first cartridge valve 311 is connected to the main oil supply pipeline 22, and the main oil port B of the fourth cartridge valve 314 is connected to the main oil return pipeline 23. The main oil ports B of the first cartridge valve 311 and the second cartridge valve 312, the main oil ports A of the second cartridge valve 312 and the third cartridge valve 313, the main oil ports B of the third cartridge valve 313 and the fourth cartridge valve 314, and the main oil ports A of the fourth cartridge valve 314 and the first cartridge valve 311 are connected in sequence. The main oil port A of the first cartridge valve 311 is connected to the rodless cavity of the upper main pressure cylinder 12, and a sequence valve 315 is provided on the pipeline connecting the main oil port A of the first cartridge valve 311 to the rodless cavity of the upper main pressure cylinder 12. The main oil port A of the second cartridge valve 312 is connected to the rodless cavity of the upper main pressure cylinder 12;

[0045] The control mechanism includes a first electromagnetic directional valve 321, a second electromagnetic directional valve 322, and a third electromagnetic directional valve 323. The oil inlets of the first electromagnetic directional valve 321, the second electromagnetic directional valve 322, and the third electromagnetic directional valve 323 are all connected unidirectionally to the main oil ports A and B of the first cartridge valve 311 and the main oil port A of the second cartridge valve 312. The oil return ports of the first electromagnetic directional valve 321, the second electromagnetic directional valve 322, and the third electromagnetic directional valve 323 are all connected to the main oil return pipeline 23. The working port of the first electromagnetic directional valve 321 is connected to the control oil port of the second cartridge valve 312. The working port of the third electromagnetic directional valve 323 is connected to the control oil port of the fourth cartridge valve 314. The working port of the second electromagnetic directional valve 322 is connected to the control oil ports of the first cartridge valve 311 and the third cartridge valve 313 respectively.

[0046] When the first electromagnetic directional valve 321, the second electromagnetic directional valve 322 and the third electromagnetic directional valve 323 lose power, the control oil ports of the first cartridge valve 311, the second cartridge valve 312, the third cartridge valve 313 and the fourth cartridge valve 314 are connected to the high-pressure oil, the cartridge valves are closed, the oil passage of the upper main pressure cylinder 12 is locked, and the cylinder is in the pressure-holding state; when the first electromagnetic directional valve 321 and the third electromagnetic directional valve 323 are energized, the second cartridge valve 312 and the fourth cartridge valve 314 are opened, the pressure oil enters the rodless cavity of the upper main pressure cylinder 12 through the second cartridge valve 312, and the rod chamber of the upper main pressure cylinder 12 is connected to the main oil return pipeline 23 through the fourth cartridge valve 314; when the second electromagnetic directional valve 322 is energized and the first electromagnetic directional valve 321 and the third electromagnetic directional valve 323 lose power, the first cartridge valve 311 and the third cartridge valve 313 are opened, the pressure oil enters the rod chamber of the upper main pressure cylinder 12 through the first cartridge valve 311, and the rodless cavity of the upper main pressure cylinder 12 is connected to the main oil return pipeline 23 through the third cartridge valve 313.

[0047] The pressure regulating mechanism includes a main valve 331, a switching valve 332 and a fourth electromagnetic directional valve 333. Both the main valve 331 and the switching valve 332 are cartridge valves. The main oil port A of the switching valve 332 is connected to the main oil port A of the second cartridge valve 312. The main oil port A of the main valve 331 is connected to the main oil port B of the switching valve 332. The main oil port B of the main valve 331 is connected to the main oil port B of the third cartridge valve 313. A proportional relief valve 334 is provided between the control oil port of the main valve 331 and the oil return port of the fourth electromagnetic directional valve 333. The working port of the fourth electromagnetic directional valve 333 is connected to the control port of the switching valve 332. The oil inlet port of the fourth electromagnetic directional valve 333 is unidirectionally connected to the main oil port A, the main oil port B of the first cartridge valve 311 and the main oil port A of the second cartridge valve 312.

[0048] A pressure transmitter is connected to the main oil port B of the switching valve 332. A proportional directional valve is connected to the main oil port B of the second cartridge valve 312. The main oil port B of the second cartridge valve 312 is connected to the oil inlet port of the proportional directional valve. The oil outlet port of the proportional directional valve is connected to the fuel tank. The working port of the proportional directional valve is connected to the pressure transmitter.

[0049] During the friction process of the workpiece to be welded, the switching valve 332 is opened and the proportional relief valve 334 works. Since the friction coefficient is a variable during the friction process as the temperature rises, the proportional relief valve 334 changes the pressure according to the feedback signal with the change of the friction coefficient to make the friction force between the workpieces to be welded constant. When the workpiece to be welded is in the non-friction state, the switching valve 332 is closed and the proportional relief valve 334 is in the non-working state.

[0050] The welding device 1 includes a frame 11, an upper main pressing oil cylinder 12, and a lower main pressing oil cylinder 13. The hydraulic rods of the upper main pressing oil cylinder 12 and the lower main pressing oil cylinder 13 are arranged oppositely. There are two driving devices 3 with exactly the same structure, and the two driving devices 3 are respectively connected to the upper main pressing oil cylinder 12 and the lower main pressing oil cylinder 13.

[0051] There are two clamping devices 4, and the two clamping devices 4 are arranged oppositely. The clamping device 4 includes a solenoid directional valve IV 41, a stacked pilot-operated check valve I 42, a stacked one-way throttle valve I 43, and a clamping oil cylinder 44 that are connected in sequence. The oil inlet and oil outlet of the solenoid directional valve IV 41 are respectively connected to the main oil supply pipeline 22 and the main oil return pipeline 23. The two working oil ports of the solenoid directional valve IV 41 are respectively connected to the two oil inlets of the stacked pilot-operated check valve I 42. The two oil outlets of the stacked pilot-operated check valve I 42 are respectively connected to the two oil inlets of the stacked one-way throttle valve I 43. The two oil outlets of the stacked one-way throttle valve I 43 are respectively connected to the rodless cavity and the rod cavity of the clamping oil cylinder 44.

[0052] When the solenoid directional valve IV 41 is in the middle position, the clamping oil cylinder 44 is in the pressure-holding state; when the solenoid directional valve IV 41 is in the left position, the clamping oil cylinder 44 is in the extended state; when the solenoid directional valve IV 41 is in the right position, the clamping oil cylinder 44 is in the contracted state.

[0053] The moving device 5 includes a solenoid directional valve V 51, a stacked pilot-operated check valve II 52, a stacked one-way throttle valve II 53, and a positioning oil cylinder 54 that are connected in sequence. The oil inlet and oil outlet of the solenoid directional valve V 51 are respectively connected to the main oil supply pipeline 22 and the main oil return pipeline 23.

[0054] When the solenoid directional valve V 51 is in the middle position, the positioning oil cylinder 54 is in the pressure-holding state; when the solenoid directional valve V 51 is in the left position, the positioning oil cylinder 54 is in the extended state; when the solenoid directional valve V 51 is in the right position, the positioning oil cylinder 54 is in the contracted state.

[0055] The brake device 6 includes a solenoid directional valve I 61, a stacked pilot-operated check valve 62, a left brake oil cylinder 63, a right brake oil cylinder 64, and a voltage stabilizing device 65. The oil inlet and oil outlet of the solenoid directional valve I 61 are respectively connected to the main oil supply pipeline 22 and the main oil return pipeline 23 of the oil supply device 2. The two working ports of the solenoid directional valve I 61 are respectively connected to the stacked pilot-operated check valve 62. The left brake oil cylinder 63 and the right brake oil cylinder 64 are arranged in parallel and connected to the stacked pilot-operated check valve 62. The voltage stabilizing device 65 is connected to the rodless cavities of the left brake oil cylinder 63 and the right brake oil cylinder 64.

[0056] When the electromagnetic directional valve Ⅰ 61 is in the middle position, the left brake cylinder 63 and the right brake cylinder 64 are in the pressure-holding state; when the electromagnetic directional valve Ⅰ 61 is in the left position, the left brake cylinder 63 and the right brake cylinder 64 are in the clamping state; when the electromagnetic directional valve Ⅰ 61 is in the right position, the left brake cylinder 63 and the right brake cylinder 64 are in the relaxed state.

[0057] A pressure transmitter and a pressure gauge are provided on the main oil supply pipeline 22.

[0058] The main oil port A of the cartridge valve described in the present invention refers to the port at the top of the cartridge valve, and the main oil port B refers to the port on the side of the cartridge valve.

[0059] Operation steps:

[0060] 1) The length of the aluminum busbar to be welded is about 2200 mm, and the height of the steel claw is about 600 mm. Pass the aluminum busbar through the middle of the gearbox connected to the rotating motor (the rotating motor and the gearbox are not shown in the figure). Set the claw head of the steel claw upward and align and clamp the welding surfaces of the busbar and the steel claw through the clamping cylinder 44. Then move the workpiece to be welded to the coaxial position of the upper main pressure cylinder and the lower main pressure cylinder through the positioning cylinder 54.

[0061] 2) Energize the first electromagnetic directional valve 321 and the third electromagnetic directional valve 323, open the second cartridge valve 312 and the fourth cartridge valve 314. The pressure oil enters the rodless cavities of the upper main pressure cylinder 12 and the lower main pressure cylinder 13 through the second cartridge valve 312, and the hydraulic rods extend to pre-press the busbar and the steel claw.

[0062] 3) The rotating motor rotates, thereby driving the aluminum busbar to rotate and rub against the steel claw. To ensure a constant friction force between the aluminum busbar and the steel claw during the friction process, the lower main pressure cylinder 13 holds pressure, and the upper main pressure cylinder 12 continues to pressurize. At the same time, the switching valve 332 opens, and the proportional relief valve 334 works. The proportional relief valve 334 adjusts the pressure of the upper main pressure cylinder 12 according to the change of the friction coefficient, so that the friction force between the aluminum busbar and the steel claw is constant during the friction heating process.

[0063] 4) When the aluminum busbar and the steel claw reach the welding temperature, the clutch of the rotating motor and the gearbox is opened. The gearbox and the aluminum busbar will continue to rotate under the action of inertia. Control the left brake cylinder 63 and the right brake cylinder 64 to clamp the rotating gearbox through the electromagnetic directional valve Ⅰ 61 to stop the busbar from rotating. At the same time, the upper main pressure cylinder 12 and the lower main pressure cylinder 13 pressurize simultaneously, squeezing the aluminum busbar and the steel claw for 10 s - 12 s to weld the steel claw and the aluminum busbar under high temperature and high pressure.

[0064] 5) Release the clamping cylinder and the brake cylinder, and take out the welded workpiece through the positioning cylinder 54.

[0065] The above only describes in detail the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention, and all such changes should be included within the scope of protection of the present invention.

Claims

1. A hydraulic control system for a friction welding machine of an aluminum guide rod and a steel claw, characterized in that: It includes a welding device (1), an oil supply device (2), a driving device (3), a clamping device (4) and a moving device (5). The welding device (1) is connected to the driving device (3), and the driving device (3), the clamping device (4) and the moving device (5) are all connected to the oil supply device (2); The oil supply device (2) includes an oil tank (21), a hydraulic pump, a main oil supply pipeline (22) and a main oil return pipeline (23). The main oil supply pipeline (22) is connected to the hydraulic pump, and the main oil return pipeline (23) communicates with the oil tank (21); The welding device (1) includes a frame (11), an upper main pressing oil cylinder (12) and a lower main pressing oil cylinder (13). The hydraulic rods of the upper main pressing oil cylinder (12) and the lower main pressing oil cylinder (13) are arranged oppositely. There are two driving devices (3), and the two driving devices (3) are respectively connected to the upper main pressing oil cylinder (12) and the lower main pressing oil cylinder (13). There are two clamping devices (4), and the two clamping devices (4) are arranged oppositely; The hydraulic pump is connected to a shock-absorbing motor (24). A high-pressure oil filter (25) and a direction valve (26) are sequentially arranged between the hydraulic pump and the main oil supply pipeline (22). A pressure regulating valve group (27) is arranged between the high-pressure oil filter (25) and the main oil supply pipeline (22); The driving device (3) includes an oil supply mechanism and a control mechanism. The oil supply mechanism includes a first cartridge valve (311), a second cartridge valve (312), a third cartridge valve (313) and a fourth cartridge valve (314). The main oil port B of the first cartridge valve (311) communicates with the main oil supply pipeline (22), and the main oil port B of the fourth cartridge valve (314) communicates with the main oil return pipeline (23). The main oil port B of the first cartridge valve (311) and the main oil port B of the second cartridge valve (312), the main oil port A of the second cartridge valve (312) and the main oil port A of the third cartridge valve (313), the main oil port B of the third cartridge valve (313) and the main oil port B of the fourth cartridge valve (314), the main oil port A of the fourth cartridge valve (314) and the main oil port A of the first cartridge valve (311) are sequentially communicated. The main oil port A of the first cartridge valve (311) communicates with the rod chamber of the upper main pressing oil cylinder (12). A sequence valve (315) is arranged on the pipeline where the main oil port A of the first cartridge valve (311) communicates with the rod chamber of the upper main pressing oil cylinder (12). The main oil port A of the second cartridge valve (312) communicates with the rodless chamber of the upper main pressing oil cylinder (12); The control mechanism includes a first electromagnetic reversing valve (321), a second electromagnetic reversing valve (322) and a third electromagnetic reversing valve (323). The oil inlets of the first electromagnetic reversing valve (321), the second electromagnetic reversing valve (322) and the third electromagnetic reversing valve (323) are all unidirectionally communicated with the main oil port A, the main oil port B of the first cartridge valve (311) and the main oil port A of the second cartridge valve (312). The oil return ports of the first electromagnetic reversing valve (321), the second electromagnetic reversing valve (322) and the third electromagnetic reversing valve (323) are all communicated with the main oil return pipeline (23). The working port of the first electromagnetic reversing valve (321) is communicated with the control oil port of the second cartridge valve (312). The working port of the third electromagnetic reversing valve (323) is communicated with the control oil port of the fourth cartridge valve (314). The working port of the second electromagnetic reversing valve (322) is respectively communicated with the control oil ports of the first cartridge valve (311) and the third cartridge valve (313).

2. The hydraulic control system of a friction welding aluminum guide rod and steel claw welding machine according to claim 1, characterized in that: It further includes a brake device (6). The brake device (6) includes an electromagnetic reversing valve I (61), a stacked pilot check valve (62), a left brake cylinder (63), a right brake cylinder (64) and a voltage stabilizing device (65). The oil inlet and the oil outlet of the electromagnetic reversing valve I (61) are respectively communicated with the main oil supply pipeline (22) and the main oil return pipeline (23) of the oil supply device (2). The two working ports of the electromagnetic reversing valve I (61) are respectively communicated with the stacked pilot check valve (62). The left brake cylinder (63) and the right brake cylinder (64) are arranged in parallel and are communicated with the stacked pilot check valve (62). The voltage stabilizing device (65) is communicated with the rodless cavities of the left brake cylinder (63) and the right brake cylinder (64).

3. The hydraulic control system of a friction welding aluminum guide rod and steel claw welding machine according to claim 1, characterized in that: The hydraulic pump includes a piston pump (28) and a vane pump (29). The pressure regulating valve group in the oil circuit where the piston pump (28) is located is a high-pressure pressure regulating valve group. The pressure regulating valve group in the oil circuit where the vane pump (29) is located is a low-pressure pressure regulating valve group.

4. A hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw according to claim 3, characterized in that: The high-pressure pressure regulating valve group includes a cartridge valve I (271), a relief valve I (272), a relief valve II (273) and an electromagnetic reversing valve II (274). The main oil port A of the cartridge valve I (271) is communicated with the main oil port A of the direction valve. The control oil port of the cartridge valve I (271) is respectively communicated with the oil inlets of the relief valve I (272), the relief valve II (273) and the electromagnetic reversing valve II (274). The oil outlet of the relief valve I (272) is communicated with the working port of the electromagnetic reversing valve II (274). The main oil port B of the cartridge valve I (271), the oil return port of the electromagnetic reversing valve II (274) and the oil outlet of the relief valve II (273) are all communicated with the main oil return pipeline (23). The low-pressure pressure regulating valve group includes a cartridge valve II (275), a relief valve III (276) and a solenoid directional valve III (277). The main oil port A of the cartridge valve II (275) is communicated with the main oil port A of the directional valve. The control oil ports of the cartridge valve II (275) are respectively communicated with the oil inlets of the relief valve III (276) and the solenoid directional valve III (277). The main oil port B of the cartridge valve II (275), the oil return port of the solenoid directional valve III (277) and the oil outlet of the relief valve III (276) are all communicated with the main oil return pipeline (23).

5. The hydraulic control system of a friction welding aluminum guide rod and steel claw welding machine according to claim 1, characterized in that: The driving device (3) further includes a pressure regulating mechanism. The pressure regulating mechanism includes a main valve (331), a switching valve (332) and a fourth solenoid directional valve (333). Both the main valve (331) and the switching valve (332) are cartridge valves. The main oil port A of the switching valve (332) is communicated with the main oil port A of the second cartridge valve (312). The main oil port A of the main valve (331) is communicated with the main oil port B of the switching valve (332). The main oil port B of the main valve (331) is communicated with the main oil port B of the third cartridge valve (313). A proportional relief valve (334) is arranged between the control oil port of the main valve (331) and the oil return port of the fourth solenoid directional valve (333). The working port of the fourth solenoid directional valve (333) is communicated with the control port of the switching valve (332). The oil inlet of the fourth solenoid directional valve (333) is unidirectionally communicated with the main oil port A, the main oil port B of the first cartridge valve (311) and the main oil port A of the second cartridge valve (312).

6. A hydraulic control system for a friction welding machine for welding an aluminum guide bar and a steel claw according to claim 1, characterized in that: The clamping device (4) includes a solenoid directional valve IV (41), a stacked pilot-operated check valve I (42), a stacked one-way throttle valve I (43) and a clamping oil cylinder (44) which are communicated in sequence. The oil inlet and the oil outlet of the solenoid directional valve IV (41) are respectively communicated with the main oil supply pipeline (22) and the main oil return pipeline (23).

7. A hydraulic control system for a friction welding machine for welding an aluminum guide rod and a steel claw according to claim 1, characterized in that: The moving device (5) includes a solenoid directional valve V (51), a stacked pilot-operated check valve II (52), a stacked one-way throttle valve II (53) and a positioning oil cylinder (54) which are communicated in sequence. The oil inlet and the oil outlet of the solenoid directional valve V (51) are respectively communicated with the main oil supply pipeline (22) and the main oil return pipeline (23).

8. The hydraulic control system of a friction welding machine for welding aluminum guide rods and steel claws according to claim 1, characterized in that: A pressure gauge is arranged between the high-pressure oil filter (25) and the directional valve (26). A pressure transmitter and a pressure gauge are arranged on the main oil supply pipeline (22).

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