Double closed loop variable form hydraulic machine

Abstract

The application relates to the technical field of hydraulic machines, in particular to a double-closed-loop deformation hydraulic machine which comprises a base, an upper die fixing base, a lower die fixing base, a main hydraulic cylinder, an auxiliary hydraulic cylinder, a lower hydraulic cylinder, a quick oil supply device and a hydraulic oil supply system, the upper die fixing base is driven to ascend and descend through the auxiliary hydraulic cylinder, the working cavity of the auxiliary hydraulic cylinder is smaller than that of the main hydraulic cylinder, the telescopic shaft of the auxiliary hydraulic cylinder has a higher telescopic efficiency, the ascending and descending speed of the upper die fixing base is high, the upper die fixing base can be quickly moved to a specified position in work, the telescopic shaft of the main hydraulic cylinder is quickly extended to a specified position to abut against the upper die fixing base through the quick oil supply device, and the quick oil supply device is favorable to accelerating the machining efficiency of workpiece hydraulic deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic machines, more specifically, it relates to a double closed loop deformation hydraulic machine. BACKGROUND

[0002] Hydraulic machines are important forming equipment, driven by electric motors to generate high-pressure liquid, through hydraulic cylinders to generate linear motion to work, because of the wide adaptability of hydraulic machine processing, it is widely used in metal and non-metal forming processing occasions. As a kind of better hydraulic machine, double closed loop deformation servo hydraulic machine is popular in the market because of its high precision and convenient operation, double closed loop deformation servo hydraulic machine refers to pressure closed loop control and displacement closed loop control, pressure closed loop control: through the sensor to monitor the pressure change in the hydraulic system in real time, keep in the preset pressure range, this kind of closed loop control ensures the stability and consistency in the forming process; Displacement closed loop control: using servo system to control the position and movement of the piston, to achieve accurate displacement and speed control, this control method can ensure the accurate forming and repeatability of workpiece.

[0003] In related technology, the double closed loop hydraulic machine is provided with a main hydraulic cylinder, the main hydraulic cylinder is connected with the upper die fixed seat to drive the upper die fixed seat to rise and fall and provide pressure to deform the workpiece. In order to provide larger pressure, the cylinder body of the main hydraulic cylinder is generally set larger, and the liquid inlet and outlet efficiency of the main hydraulic cylinder is lower, which leads to slow stroke speed of the telescopic shaft, so that the efficiency of workpiece processing is slow. SUMMARY

[0004] In order to solve the problem that the liquid inlet and outlet efficiency of the main hydraulic cylinder of the double closed loop deformation hydraulic machine in related technology is low, which leads to slow stroke speed of the telescopic shaft, so that the efficiency of workpiece processing is slow, the present application provides a double closed loop deformation hydraulic machine.

[0005] The utility model provides a double closed loop deformation hydraulic machine, including base, upper die fixed base, lower die fixed base, main hydraulic cylinder, auxiliary hydraulic cylinder, lower hydraulic cylinder, quick oil supply device, hydraulic oil supply system, the base is provided with stand, the lower hydraulic cylinder is fixedly upwards in the base bottom and penetrates the base, the lower hydraulic cylinder is connected with the lower die fixed base and drives lower die fixed base to lift, the upper die fixed base sets up in the lower die fixed base's top and with the stand sliding connection, the auxiliary hydraulic cylinder is fixedly upwards in the base's side wall and is connected with the upper die fixed base and supports upper die fixed base and drives its lift, the main hydraulic cylinder is fixedly downwards in the stand top for to the upper die fixed base pressure, the working chamber of main hydraulic cylinder is greater than the working chamber of auxiliary hydraulic cylinder, the quick oil supply device is fixed to the cylinder body outer wall of main hydraulic cylinder and is communicated with the working chamber of main hydraulic cylinder and makes the working chamber quick oil supply and makes the telescopic axle of main hydraulic cylinder fast stretch and abut the upper die fixed base, the main hydraulic cylinder, auxiliary hydraulic cylinder, lower hydraulic cylinder are communicated with the hydraulic oil supply system and get the oil supply of hydraulic oil supply system and through the hydraulic oil supply system control its telescopic axle movement stroke.

[0006] Preferably, the quick oil supply device includes an upper oil tank, a communication pipe, an electromagnetic liquid filling valve, and a vacuum pump. The upper oil tank is fixed to the cylinder body outer wall of the main hydraulic cylinder for storing hydraulic oil. The cylinder body of the main hydraulic cylinder is provided with an opening communicating with the internal working chamber. One end of the communication pipe is connected to the opening and communicates with the working chamber of the main hydraulic cylinder. The other end of the communication pipe penetrates into the upper oil tank and communicates with the inside of the upper oil tank. The vacuum pump is connected to the communication pipe to vacuumize the inside of the communication pipe and the working chamber of the main hydraulic cylinder, so that the hydraulic oil in the upper oil tank is driven into the working chamber of the main hydraulic cylinder to drive the telescopic axle of the main hydraulic cylinder to extend. The electromagnetic liquid filling valve is arranged in the communication pipe to control the flow of hydraulic oil.

[0007] Preferably, the hydraulic oil supply system includes a main oil tank, a first oil pump, a second oil pump, a first oil circuit integrated plate, a second oil circuit integrated plate, an electric control box, and a plurality of oil guide pipes. The main oil tank is located on one side of the base. The first oil pump and the second oil pump are both fixed to the tank body of the main oil tank and communicate with the inside of the main oil tank for pumping hydraulic oil. The first oil circuit integrated plate and the second oil circuit integrated plate are both fixed to the tank body of the main oil tank. The first oil circuit integrated plate communicates with the output end of the first oil pump, and the lower hydraulic cylinder is connected to the first oil circuit integrated plate through the oil guide pipe. The second oil circuit integrated plate communicates with the output end of the second oil pump, and the auxiliary hydraulic cylinder and the main hydraulic cylinder are connected to the second oil circuit integrated plate through the oil guide pipe. The first oil pump, the second oil pump, the first oil circuit integrated plate, the second oil circuit integrated plate, the vacuum pump, and the electromagnetic liquid filling valve are all electrically connected to the electric control box.

[0008] Preferably, the quick oil supply device further comprises an overflow pipe, one end of the overflow pipe penetrating from the top of the side wall of the upper oil tank to the inside, the other end of the overflow pipe communicating with the inside of the main oil tank so that the hydraulic oil in the upper oil tank exceeding the reserved depth flows back to the main oil tank.

[0009] Preferably, the number of the columns is four, the four columns are distributed and arranged at the four corners of the base, the four columns are connected and support the main hydraulic cylinder, the upper die fixing seat is provided with through holes at the four corners and a sliding sleeve is arranged in each through hole, and the four sliding sleeves are sleeved on the four columns for sliding.

[0010] Preferably, the number of the auxiliary hydraulic cylinders is two, the two auxiliary hydraulic cylinders are distributed and fixed on the opposite sides of the base and are connected with the opposite sides of the upper die fixing seat.

[0011] The beneficial technical effects of the present application are:

[0012] 1. The upper die fixing seat is driven to ascend and descend by the auxiliary hydraulic cylinder, the working cavity of the auxiliary hydraulic cylinder is smaller than that of the main hydraulic cylinder, the extension and retraction efficiency of the extension and retraction shaft of the auxiliary hydraulic cylinder is faster, the ascending and descending speed of the upper die fixing seat is fast, the upper die fixing seat is conveniently moved to a specified position in work, the working cavity of the main hydraulic cylinder is quickly supplied with oil by the quick oil supply device, the extension and retraction shaft of the main hydraulic cylinder is quickly extended to a specified position to abut against the upper die fixing seat, and the processing efficiency of the hydraulic deformation of the workpiece is accelerated.

[0013] 2. The upper oil tank is fixed on the outer wall of the cylinder body of the main hydraulic cylinder and is close to the main hydraulic cylinder, a negative pressure environment is realized by the vacuum pump, the hydraulic oil in the upper oil tank is quickly flushed into the working cavity of the main hydraulic cylinder through the communication pipe to drive the extension and retraction shaft of the main hydraulic cylinder to quickly extend, the movement stroke of the extension and retraction shaft of the main hydraulic cylinder is controlled by the electromagnetic liquid filling valve to control the extension and retraction shaft of the hydraulic cylinder to extend to a specified position.

[0014] 3. The hydraulic cylinder is precisely supplied with oil and returns oil by the control of the oil pump machine and the oil way integrated plate by the electric control box to control the supply pressure and the driving stroke of the hydraulic cylinder, which is beneficial to the high forging precision of the workpiece and the guarantee of the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of a double closed loop deformation hydraulic machine of the present embodiment.

[0016] Figure 2 It is a structure schematic view of another angle of a double closed loop deformation hydraulic machine of the present embodiment.

[0017] Reference numerals: 1, base; 11, stand column; 2, upper die fixing seat; 21, sliding sleeve; 3, lower die fixing seat; 4, main hydraulic cylinder; 5, auxiliary hydraulic cylinder; 6, lower hydraulic cylinder; 7, quick oil supply device; 71, upper oil tank; 72, communication pipe; 73, electromagnetic liquid filling valve; 74, vacuum pump; 75, overflow pipe; 8, hydraulic oil supply system; 81, main oil tank; 82, first oil pump; 83, second oil pump; 84, first oil path integrated plate; 85, second oil path integrated plate; 86, electric control box; 87, oil guide pipe; 88, photoelectric switch; 89, first grating sensor; 810, second grating sensor. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0019] Reference Figure 1 and Figure 2The utility model provides a kind of double closed loop deformation hydraulic machine, including pedestal 1, upper die fixed seat 2, lower die fixed seat 3, main hydraulic cylinder 4, auxiliary hydraulic cylinder 5, lower hydraulic cylinder 6, quick oil supply device 7, hydraulic oil supply system 8, pedestal 1 is provided with column 11, the number of column 11 is four, four column 11 is distributed and is set to the four corners of pedestal 1, lower hydraulic cylinder 6 is vertically upwards fixed in the bottom of pedestal 1 and penetrates pedestal 1, lower die fixed seat 3 is between four column 11 and is connected with lower hydraulic cylinder 6, lower die fixed seat 3 is driven by lower hydraulic cylinder 6 to lift, lower die fixed seat 3 is used to install the lower die of mould, workpiece is fixed in the cavity of lower die, the four corners of upper die fixed seat 2 are provided with through hole and are provided with sliding sleeve 21 in each through hole, four sliding sleeves 21 are respectively sleeved into four column 11 and slide to make upper die fixed seat 2 stably slide along the length direction of column 11, the number of auxiliary hydraulic cylinder 5 is two, two auxiliary hydraulic cylinders 5 are respectively fixed on the opposite sides of pedestal 1 and are respectively connected with the opposite sides of upper die fixed seat 2 to support upper die fixed seat 2 and drive upper die fixed seat 2 to lift, upper die fixed seat 2 is driven more stably by two auxiliary hydraulic cylinders 5, upper die fixed seat 2 is used to fix the upper die of mould, workpiece is formed by upper die and lower die cooperation forging pressure workpiece, upper die is driven to descend by auxiliary hydraulic cylinder 5 and drives it to descend, lower die is driven to ascend by lower hydraulic cylinder 6 and drives it to ascend, the common movement of upper die and lower die is conducive to shortening single stroke, saves the butt joint time of the movement of upper die and lower die, main hydraulic cylinder 4 is vertically downwards and vertically fixed on the top of four column 11, the telescopic shaft of main hydraulic cylinder 4 is between four column 11, the telescopic shaft of main hydraulic cylinder 4 is pressed out and presses upper die fixed seat 2, realizes the pressure of upper die fixed seat 2 to make upper die forging pressure workpiece, the working cavity of main hydraulic cylinder 4 is set to be greater than the working cavity of auxiliary hydraulic cylinder 5 to provide greater pressure to upper die fixed seat 2, quick oil supply device 7 is fixed on the outer wall of the cylinder body of main hydraulic cylinder 4 and is communicated with the working cavity of main hydraulic cylinder 4 to quickly supply oil to the working cavity, and the telescopic shaft of main hydraulic cylinder 4 is quickly extended to abut to upper die fixed seat 2, the telescopic shaft of main hydraulic cylinder 4 realizes high efficiency of quick extension stroke, and the processing efficiency of workpiece hydraulic deformation is accelerated, main hydraulic cylinder 4, auxiliary hydraulic cylinder 5, lower hydraulic cylinder 6 are communicated with hydraulic oil supply system 8, and are supplied with oil by hydraulic oil supply system 8, and the movement stroke of the telescopic shaft is controlled by hydraulic oil supply system 8, so that workpiece forging precision is high, and product quality is guaranteed.

[0020] Refer to Figure 1 And Figure 2The quick oil supply device 7 comprises an oil tank 71, a communicating pipe 72, an electromagnetic liquid filling valve 73, and a vacuum pump 74. The oil tank 71 is fixed to the outer wall of the cylinder body of the main hydraulic cylinder 4 for storing hydraulic oil. The cylinder body of the main hydraulic cylinder 4 is provided with an opening communicating with the working chamber inside the cylinder body. One end of the communicating pipe 72 is connected to the opening and communicates with the working chamber of the main hydraulic cylinder 4. The other end of the communicating pipe 72 penetrates into the oil tank 71 and communicates with the inside of the oil tank 71. The vacuum pump 74 (not shown in the figure) is connected to the communicating pipe 72 to vacuumize the inside of the communicating pipe 72 and the working chamber of the main hydraulic cylinder 4, so that the hydraulic oil in the oil tank 71 is rushed into the working chamber of the main hydraulic cylinder 4 to drive the telescopic shaft of the main hydraulic cylinder 4 to extend. The electromagnetic liquid filling valve 73 is arranged in the communicating pipe 72 for controlling the flow of hydraulic oil. The oil tank 71 is fixed to the outer wall of the cylinder body of the main hydraulic cylinder 4 and is close to the main hydraulic cylinder 4. A negative pressure environment is created by the vacuum pump 74 to realize that the hydraulic oil in the oil tank 71 is quickly rushed into the working chamber of the main hydraulic cylinder 4 through the communicating pipe 72 to drive the telescopic shaft of the main hydraulic cylinder 4 to quickly extend. The flow of hydraulic oil is controlled by the electromagnetic liquid filling valve 73 to realize the control of the moving stroke of the telescopic shaft of the main hydraulic cylinder 4, so that the telescopic shaft of the hydraulic cylinder is extended to a specified position.

[0021] With reference to Figure 2, the hydraulic oil supply system 8 includes a main oil tank 81, a first oil pump 82, a second oil pump 83, a first oil circuit integrated plate 84, a second oil circuit integrated plate 85, an electric control box 86, a plurality of oil guide pipes 87 (not shown in the figure), a main oil line is located on one side of the base 1, the first oil pump 82 and the second oil pump 83 are both fixed on the tank body of the main oil tank 81 and communicate with the inside of the main oil tank 81 for pumping hydraulic oil, the first oil circuit integrated plate 84 and the second oil circuit integrated plate 85 are both fixed on the tank body of the main oil tank 81, the first oil circuit integrated plate 84 and the second oil circuit integrated plate 85 are both fixed on the tank body of the main oil tank 81, the first oil circuit integrated plate 84 communicates with the output end of the first oil pump 82, the lower hydraulic cylinder 6 is connected with the first oil circuit integrated plate 84 through the oil guide pipe 87, the second oil circuit integrated plate 85 communicates with the output end of the second oil pump 83 and the auxiliary hydraulic cylinder 5 and the main hydraulic cylinder 4 are both connected with the second oil circuit integrated plate 85 through the oil guide pipe 87, the first oil pump 82, the second oil pump 83, the first oil circuit integrated plate 84, the second oil circuit integrated plate 85, the vacuum pump 74 and the electromagnetic liquid filling valve 73 are all electrically connected with the electric control box 86, the first oil circuit integrated plate 84 and the second oil circuit integrated plate 85 are both pressure and flow control valve plates integrated with pressure valves and flow valves, the first oil pump 82 pumps the hydraulic oil in the main oil tank 81 to flow into the working cavity of the lower hydraulic cylinder 6 through the first oil circuit integrated plate 84 to drive the telescopic shaft of the lower hydraulic cylinder 6 to perform telescopic movement and control the hydraulic oil supply pressure and flow through the first oil circuit integrated plate 84 so that the telescopic amount and telescopic speed of the telescopic shaft of the lower hydraulic cylinder 6 are controllable, the second oil pump 83 pumps the hydraulic oil in the main oil tank 81 to flow into the working cavities of the auxiliary hydraulic cylinder 5 and the main hydraulic cylinder 4 through the second oil circuit integrated plate 85 to drive the telescopic shaft of the auxiliary hydraulic cylinder 5 to perform telescopic movement and the telescopic shaft of the main hydraulic cylinder 4 to perform telescopic movement and control the hydraulic oil supply pressure and flow through the second oil circuit integrated plate 85 so that the telescopic amount and telescopic speed of the telescopic shafts of the auxiliary hydraulic cylinder 5 and the main hydraulic cylinder 4 are controllable.

[0022] With reference to Figure 1 And Figure 2 , the hydraulic oil supply system 8 further includes a photoelectric switch 88, a first grating sensor 89 and a second grating sensor 810, the photoelectric switch 88 is fixed on the side surface of the upper die fixed base 2 for detecting the distance between the upper die fixed base 2 and the base 1, the first grating sensor 89 is fixed on the outer wall of the cylinder body of the main hydraulic cylinder 4 for detecting the active stroke of the telescopic shaft of the main hydraulic cylinder 4, the second grating sensor 810 is fixed on the outer wall of the cylinder body of the lower hydraulic cylinder 6 for detecting the active stroke of the telescopic shaft of the lower hydraulic cylinder 6, the photoelectric switch 88, the first grating sensor 89 and the second grating sensor 810 are all electrically connected with the electric control box 86.

[0023] With reference to Figure 2Further, the quick oil supply device 7 further comprises an overflow pipe 75, one end of the overflow pipe 75 penetrating from the top of the side wall of the upper oil tank 71 to the inside, and the other end of the overflow pipe 75 communicating with the inside of the main oil tank 81, so that the hydraulic oil exceeding the reserved depth in the upper oil tank 71 flows back to the main oil tank 81, which is beneficial to reduce the pollution of the environment caused by the overflow of the hydraulic oil from the upper oil tank 71 due to the excessive accumulation of the hydraulic oil in the upper oil tank 71.

[0024] The working principle of the double closed loop deformation hydraulic machine is as follows: in the initial state, the telescopic shaft of the lower hydraulic cylinder 6 is in the retracted state, the lower die fixed seat 3 abuts against the top surface of the base 1, the telescopic shaft of the main hydraulic cylinder 4 is in the retracted state, the telescopic shaft of the auxiliary hydraulic cylinder 5 is in the extended state, the upper die fixed seat 2 abuts against the telescopic shaft of the main hydraulic cylinder 4, the workpiece is fixed into the cavity of the lower die, the electric control box 86 controls the first oil pump 82 and the second oil pump 83 to work simultaneously to supply hydraulic oil into the working chambers of the lower hydraulic cylinder 6 and the auxiliary hydraulic cylinder 5, so that the lower hydraulic cylinder 6 drives the lower die fixed seat 3 to rise, and the auxiliary hydraulic cylinder 5 drives the upper die fixed seat 2 to descend, when the second grating sensor 810 senses that the lower die fixed seat 3 moves to the specified position, the signal is fed back to the electric control box 86, the electric control box 86 controls the first oil way integrated plate 84 to make the telescopic shaft of the lower hydraulic cylinder 6 stop, and the lower die fixed seat 3 stops at the specified position, when the photoelectric switch 88 senses that the upper die fixed seat 2 moves to the first specified position, the signal is fed back to the electric control box 86, the electric control box 86 controls the first oil way integrated plate 84 to make the oil supply speed of the auxiliary hydraulic cylinder 5 smaller, and the upper die fixed seat 2 slowly descends, the first specified position is the distance between the upper die and the lower die which can guarantee the distance of the hand movement, the process has reflection time which is beneficial to guarantee the personal safety of the staff, in the process of slowly descending of the upper die fixed seat 2, when the photoelectric switch 88 senses that the upper die fixed seat 2 reaches the second specified position, the electric control box 86 controls the vacuum pump 74 to pump vacuum, and the hydraulic oil in the oil tank 71 flows into the working chamber of the main hydraulic cylinder 4 through the communication pipe 72 quickly to make the telescopic shaft of the main hydraulic cylinder 4 extend quickly, after the telescopic shaft of the main hydraulic cylinder 4 reaches the specified position through the first grating sensor 89, the electric control box 86 controls the electromagnetic liquid filling valve 73 to close the communication pipe 72 to make the telescopic shaft of the main hydraulic cylinder 4 stop extending, the second specified position refers to the position that the upper die just contacts the workpiece, the telescopic shaft of the main hydraulic cylinder 4 reaches the specified position, which refers to the position that the telescopic shaft of the main hydraulic cylinder 4 just abuts against the upper die fixed seat 2, after the telescopic shaft of the main hydraulic cylinder 4 abuts against the upper die fixed seat 2, the first grating sensor 89 feeds back the signal to the electric control box 86, the electric control box 86 controls the second oil way integrated plate 85 to make the auxiliary hydraulic cylinder 5 and the main hydraulic cylinder 4 supply oil simultaneously, and the oil supply speed of the main hydraulic cylinder 4 is faster than that of the auxiliary hydraulic cylinder 5, so that the telescopic shafts of the auxiliary hydraulic cylinder 5 and the main hydraulic cylinder 4 move by the same amount to act on the upper die fixed seat 2 to make the upper die fixed seat 2 slowly press the workpiece to deform the workpiece, and then the photoelectric switch 88 detects that the upper die fixed seat 2 is at the fourth specified position, at this time, the workpiece is finished, the pressure closed loop control and the displacement closed loop control make the precision of the workpiece forging deformation high, the repeatability is good, and the stroke of the telescopic shaft of the main hydraulic cylinder 4 is fast, so that the processing efficiency of the workpiece hydraulic deformation is high.

[0025] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary and that changes can be made in detail without departing from the principles and spirit of the application. The scope of the application is therefore defined by the appended claims and their equivalents.

Claims

1. A double closed loop variable form hydraulic press characterized by: The utility model provides a quick oil supply device, a hydraulic oil supply system and a hydraulic die-casting machine, and relates to the technical field of die-casting machines. The utility model provides a quick oil supply device, a hydraulic oil supply system and a hydraulic die-casting machine, and relates to the technical field of die-casting machines.

2. A dual closed loop variable hydraulic machine according to claim 1, characterized in that: The utility model provides a quick oil supply device, a hydraulic oil supply system and a hydraulic die-casting machine, and relates to the technical field of die-casting machines.

3. A dual closed loop variable hydraulic machine according to claim 2, characterized in that: The utility model provides a quick oil supply device, a hydraulic oil supply system and a hydraulic die-casting machine, and relates to the technical field of die-casting machines. The utility model provides a quick oil supply device, a hydraulic oil supply system and a hydraulic die-casting machine, and relates to the technical field of die-casting machines.

4. A dual closed loop variable hydraulic machine according to claim 1, wherein: The number of the columns is four, four columns are arranged at four corners of the base, four columns are connected with the main hydraulic cylinder to support the main hydraulic cylinder, four corners of the upper mold fixing base are provided with through holes, and a sliding sleeve is arranged in each through hole, and four sliding sleeves are sleeved on four columns to slide.

5. A dual closed loop variable hydraulic machine according to claim 1, wherein: The number of the auxiliary hydraulic cylinders is two, two auxiliary hydraulic cylinders are arranged on opposite sides of the base, and are connected with opposite sides of the upper mold fixing base.

Images