High-speed balance oil cylinder mounting structure of machine tool

Abstract

The utility model discloses a high-speed balance oil cylinder installation structure of a machine tool, which comprises a two-way hinge mechanism and a spherical hinge mechanism which are respectively arranged at the middle lower part and the bottom of a balance oil cylinder, two interfaces are arranged at the bottom of a cylinder barrel of the balance oil cylinder, each interface is connected with an oil distribution block through a stainless steel pipe and a ferrule joint, and the oil distribution block is connected with the ball hinge mechanism. The oil distribution block is fixedly connected with the cylinder barrel and connected with the energy accumulator through the hydraulic hose, and the energy accumulator is installed on the side face of the saddle and close to the lower middle portion of the balance oil cylinder. The installation structure can automatically adjust the position of the balance oil cylinder, it is guaranteed that no extra lateral positive pressure is generated between the cylinder barrel and the piston rod of the balance oil cylinder, the friction force needing to be overcome when the piston rod moves is small, the abrasion loss of the cylinder barrel and the piston rod is small, the service life is long, and the installation structure is suitable for the high-speed and high-frequency use environment. The mounting structure is more suitable for high-speed operation of moving parts such as a linear motor, the speed can reach 120 m / min, and the mounting structure is particularly suitable for gravity shaft balance on an efficient machining machine tool for new energy automobile parts.

Description

Technical Field

[0001] The utility model belongs to the field of CNC machine tools for processing new energy automobile parts, and specifically relates to a high-speed balancing oil cylinder installation structure of a high-efficiency processing machine tool for new energy automobile parts. Background Art

[0002] With the growth of new energy vehicles, lightweight vehicles have become the mainstream in order to increase the driving range, and aluminum alloy materials are increasingly widely used in automotive parts. The processing allowance of aluminum alloy blanks such as die-casting and profiles is smaller, the processing cutting speed is higher, the pure cutting time is greatly reduced, and non-cutting time such as fast-moving positioning time and tool change time has become the main percentage of the total processing time of aluminum alloys. In order to improve the processing efficiency of parts, non-cutting time needs to be greatly reduced.

[0003] The traditional screw drive has a low rapid movement speed and poor dynamic performance, which cannot meet the requirements of significantly reducing non-cutting time, resulting in the inability to significantly improve the processing efficiency of aluminum alloy parts. However, linear motors can reach a rapid speed of 120m / min through direct drive, and have excellent dynamic performance. Therefore, more and more linear motors are configured on aluminum alloy parts processing machine tools in the automotive industry. For gravity axes, in order to ensure high acceleration under linear motor drive, the gravity of the moving parts needs to be balanced, and the most common way to achieve this is through a balancing cylinder. However, under high-speed and high-acceleration moving conditions, since it is difficult for the cylinder barrel of the balancing cylinder to maintain absolute parallelism with the linear guide rail of the ram movement, additional lateral positive pressure is generated between the cylinder barrel and the piston rod of the balancing cylinder, and the ordinary balancing cylinder installation structure will cause the cylinder barrel and piston rod to wear quickly, have a short life, and have large reverse friction, which reduces the acceleration and deceleration performance of the moving parts. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a high-speed balancing oil cylinder installation structure for a machine tool in view of the deficiencies of the prior art, which can automatically adjust the position of the balancing oil cylinder to ensure that no additional lateral positive pressure is generated between the cylinder barrel and the piston rod of the balancing oil cylinder, the friction force to be overcome when the piston rod moves is small, the wear of the cylinder barrel and the piston rod is small, the service life is long, and it is suitable for high-speed and high-frequency use environments. The installation structure is more suitable for high-speed operation of moving parts such as linear motors, with a speed of up to 120m / min, and is particularly suitable for gravity axis balancing on efficient processing machine tools for new energy vehicle parts.

[0005] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a high-speed balancing oil cylinder installation structure of a machine tool, the piston rod of the balancing oil cylinder is vertically arranged downward, the balancing oil cylinder is used in conjunction with an oil separator and an accumulator, the installation structure includes a two-way hinge mechanism and a ball hinge mechanism, the two-way hinge mechanism is arranged at the middle and lower part of the balancing oil cylinder, the ball hinge mechanism is arranged at the bottom of the balancing oil cylinder, the bottom of the cylinder barrel of the balancing oil cylinder is provided with two interfaces, each of the interfaces is connected to the oil separator through a stainless steel pipe and a ferrule joint, the oil separator is fixedly connected to the cylinder barrel, the oil separator is connected to the accumulator through a hydraulic hose, the accumulator is installed on the side of the saddle and close to the middle and lower part of the balancing oil cylinder, the two-way hinge mechanism is used to realize the left and right swinging and front and back swinging of the cylinder barrel relative to the ram, and the ball hinge mechanism realizes the left and right swinging and front and back swinging of the piston rod relative to the ram.

[0006] The utility model high-speed balancing oil cylinder installation structure can realize that the cylinder barrel and piston rod of the balancing oil cylinder have sufficient freedom to swing left and right and front and back by setting a two-way hinge mechanism in the middle and lower part of the balancing oil cylinder and setting a ball hinge mechanism at the bottom of the balancing oil cylinder. When the cylinder barrel of the balancing oil cylinder is not parallel to the linear guide rail of the sliding ram, the position of the balancing oil cylinder can be automatically adjusted to ensure that no additional lateral positive pressure is generated between the cylinder barrel and the piston rod of the balancing oil cylinder. The friction force that needs to be overcome when the piston rod moves is small, the wear of the cylinder barrel and the piston rod is small, the service life is long, and it is suitable for high-speed and high-frequency use environments. Under the same driving force, the linear motor matched with the balancing oil cylinder can achieve greater acceleration and smaller axial creep, so that the dynamic performance of the machine tool is better. In addition, the installation structure can reduce the installation and positioning accuracy requirements for the balancing oil cylinder, making the installation of the balancing oil cylinder more convenient.

[0007] The utility model discloses a high-speed balancing oil cylinder installation structure, in which the two-way hinge mechanism is arranged at the middle and lower part of the balancing oil cylinder, and the ball hinge mechanism is arranged at the bottom of the balancing oil cylinder. The top end of the balancing oil cylinder is not used as a fixed position, and there are few structural restrictions on the fixed position of the balancing oil cylinder. The position of the balancing oil cylinder can be flexibly adjusted to ensure that the cylinder barrel has a higher position and the two-way hinge mechanism has a relatively lower position, thereby reducing the height of the saddle and reducing the overall moving weight of the saddle component.

[0008] The accumulator is installed on the side of the saddle and close to the middle and lower part of the balancing cylinder. The connecting pipeline between the accumulator and the balancing cylinder is short, and the fluid pressure loss along the way is small. At the same time, the accumulator and the oil distributor are connected by a hydraulic hose, and no additional lateral force is generated. Two interfaces are provided at the bottom of the cylinder barrel of the balancing cylinder. The cross-sectional area and flow rate of the oil flow are large, so that the pressure fluctuation in the balancing cylinder is small enough at the moment of high-speed movement of the piston rod. At the same time, with the accumulator, the oil in the balancing cylinder can be quickly moved in and out, providing a stable balancing force, ensuring that the balancing force of the balancing cylinder remains basically unchanged during high-speed movement, and the driving load of the linear motor remains basically unchanged when moving to any position.

[0009] As a preferred embodiment, the bidirectional hinge mechanism comprises a fixed bracket, two first transition supports symmetrically arranged front and back, and two second transition supports symmetrically arranged left and right, the two first transition supports and the two second transition supports are fixed as a whole, the front and rear sides of the cylinder barrel are symmetrically arranged with two first rotating shafts, each of the first rotating shafts is installed with a first self-lubricating bearing, the outer ring of each first self-lubricating bearing is fixed on one of the first transition supports by interference fit, each of the second transition supports is installed with a second rotating shaft by interference fit, each of the second rotating shafts is installed with a second self-lubricating bearing, the outer ring of each second self-lubricating bearing is fixed on the fixed bracket by interference fit, and the fixed bracket is fixed on the top of the saddle. The bidirectional hinge mechanism has a simple structure and is easy to install. The two first rotating shafts and the two second rotating shafts are arranged at 90 degrees. In a Cartesian coordinate system with the moving direction of the balancing oil cylinder as the Z axis, the cylinder barrel, the stainless steel pipe, and the oil distribution block can realize the overall rotation and swing of the double angle around the X axis and around the Y axis, that is, the cylinder barrel can realize the left and right and front and back bidirectional swinging freedom.

[0010] Preferably, the ball hinge mechanism comprises a connecting ring, a rotating inner ring, a latch and a fixed seat, the lower end of the piston rod is threadedly connected to the connecting ring, the rotating inner ring is rotatably installed in the connecting ring, the connecting ring and the rotating inner ring are in spherical contact, the rotating inner ring is sleeved on the latch, the left and right ends of the latch are respectively installed on the fixed seat, and the fixed seat is fixed to the side of the ram. The ball hinge mechanism has a simple structure and is easy to install, and can realize the left-right and front-back bidirectional swinging freedom between the piston rod and the ram.

[0011] Preferably, the fixing seat is fixed to the side of the ram by means of a flat key and fixing screws.

[0012] Preferably, an oil filter muffler is installed at the air inlet and outlet at the upper end of the cylinder. The function of the oil filter muffler is to ensure that the air inlet and outlet at the upper end of the cylinder does not produce whistling sound during high-speed movement, that is, to eliminate the whistling sound during high-speed movement, and at the same time collect the oil and other dirt inside the cylinder, so as not to pollute the air environment of the workshop.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1) The utility model high-speed balancing oil cylinder installation structure can realize that the cylinder barrel and piston rod of the balancing oil cylinder have sufficient freedom to swing left and right and front and back in both directions. When the cylinder barrel of the balancing oil cylinder is not parallel to the linear guide rail of the ram movement, the position of the balancing oil cylinder can be automatically adjusted to ensure that no additional lateral positive pressure is generated between the cylinder barrel and the piston rod of the balancing oil cylinder. The friction force that needs to be overcome when the piston rod moves is small, the wear of the cylinder barrel and the piston rod is small, the service life is long, and it is suitable for high-speed and high-frequency use environments. Under the same driving force, the linear motor matched with the balancing oil cylinder can achieve greater acceleration and realize smaller axial creep, so that the dynamic performance of the machine tool is better. In addition, the installation structure can reduce the installation and positioning accuracy requirements for the balancing oil cylinder, making the installation of the balancing oil cylinder more convenient.

[0015] 2) The accumulator is installed on the side of the saddle and close to the middle and lower part of the balancing cylinder. The connecting pipeline between the accumulator and the balancing cylinder is short, and the fluid pressure loss along the way is small. At the same time, the accumulator and the oil distributor are connected by a hydraulic hose, which will not generate additional lateral force. Two interfaces are provided at the bottom of the cylinder barrel of the balancing cylinder. The cross-sectional area of ​​the oil flow is large and the flow rate is high, which can achieve sufficiently small pressure fluctuations in the balancing cylinder at the moment of high-speed movement of the piston rod. At the same time, with the accumulator, the oil in the balancing cylinder can move in and out quickly, providing a stable balancing force, ensuring that the balancing force of the balancing cylinder remains basically unchanged during high-speed movement, and the driving load of the linear motor remains basically unchanged when moving to any position.

[0016] 3) The high-speed balancing cylinder installation structure of the utility model is more suitable for high-speed operation of moving parts such as linear motors, with a speed of up to 120m / min, and is especially suitable for gravity axis balancing on high-efficiency processing machines for new energy vehicle parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The effect after the balance cylinder is installed in the embodiment Figure 1 ;

[0018] Figure 2 The effect after the balance cylinder is installed in the embodiment Figure 2 ;

[0019] Figure 3 To correspond to Figure 2 Side view of

[0020] Figure 4 for Figure 3 Middle II sectional view;

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0023] Figure 7 for Figure 4 II-II sectional view;

[0024] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0025] Fig. 9 for Figure 7 Enlarged view of point D in the middle;

[0026] The specific reference numerals in the figure are as follows:

[0027] 1-Balancing cylinder, 11-Piston rod, 12-Cylinder barrel, 13-Stainless steel pipe, 14-Card sleeve joint, 15-First rotating shaft, 16-First self-lubricating bearing, 17-Second rotating shaft, 18-Second self-lubricating bearing, 2-Oil distributor, 21-Fixed bracket, 22-Cylinder clamp, 23-Hydraulic hose, 3-Accumulator, 4-Oil filter muffler, 51-Fixed bracket, 52-First transition support, 53-Second transition support, 61-Connecting ring, 62-Rotating inner ring, 63-Pin, 64-Fixed seat, 65-Flat key, 66-Fixed screw, 7-Saddle, 8-Slide pillow. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] Taking the gantry type machining center used for efficient machining of new energy vehicle parts as an example, the high-speed balancing cylinder installation structure of the machine tool of the utility model is adopted. Figures 1 to 9As shown, the piston rod 11 of the balancing oil cylinder 1 is vertically arranged downward, and the balancing oil cylinder 1 is used in conjunction with the oil separator 2 and the accumulator 3. The mounting structure includes a two-way hinge mechanism and a ball hinge mechanism. The two-way hinge mechanism is arranged at the middle and lower part of the balancing oil cylinder 1, and the ball hinge mechanism is arranged at the bottom of the balancing oil cylinder 1. An oil filter muffler 4 is installed at the air inlet and outlet of the upper end of the cylinder barrel 12 of the balancing oil cylinder 1. Two interfaces are arranged at the bottom of the cylinder barrel 12, each interface is connected to the oil separator 2 through a stainless steel pipe 13 and a ferrule joint 14, and the oil separator 2 is fixedly connected to the cylinder barrel 12 through a fixing frame 21 and a cylinder clamp 22. The oil separator 2 is connected to the accumulator 3 through a hydraulic hose 23. The accumulator 3 is installed on the side of the saddle 7 and close to the middle and lower part of the balancing oil cylinder 1. The two-way hinge mechanism is used to realize the left-right swing and the front-back swing of the cylinder barrel 12 relative to the ram 8, and the ball hinge mechanism realizes the left-right swing and the front-back swing of the piston rod 11 relative to the ram 8.

[0030] Specifically, the bidirectional hinge mechanism includes a fixed bracket 51, two first transition supports 52 symmetrically arranged front and back, and two second transition supports 53 symmetrically arranged left and right. The two first transition supports 52 and the two second transition supports 53 are fixed as a whole by screws. Two first rotating shafts 15 are symmetrically arranged on the front and rear sides of the cylinder 12, respectively. A first self-lubricating bearing 16 is installed on each first rotating shaft 15. The outer ring of each first self-lubricating bearing 16 is fixed on a first transition support 52 by interference fit. A second rotating shaft 17 is installed on each second transition support 53 by interference fit. A second self-lubricating bearing 18, the outer ring of each second self-lubricating bearing 18 is fixed on the fixed bracket 51 by interference fit, and the fixed bracket 51 is fixed on the top of the saddle 7; the ball hinge mechanism includes a connecting ring 61, a rotating inner ring 62, a latch 63 and a fixed seat 64, the lower end of the piston rod 11 is threadedly connected to the connecting ring 61, the rotating inner ring 62 is rotatably installed in the connecting ring 61, the connecting ring 61 and the rotating inner ring 62 are in spherical contact, the rotating inner ring 62 is sleeved on the latch 63, the left and right ends of the latch 63 are respectively installed on the fixed seat 64, and the fixed seat 64 is fixed to the side of the slide 8 by a flat key 65 and a fixing screw 66.

[0031] After installation, the cylinder barrel 12, the stainless steel tube 13, and the oil separator 2 form a rigid connection body. When the lower end of the piston rod 11 moves up and down with the ram 8, if the cylinder barrel 12 of the balancing oil cylinder 1 is not parallel to the linear guide rail of the ram 8, which causes the piston rod 11 to inevitably move sideways, the rigid connection body composed of the cylinder barrel 12, the stainless steel tube 13, and the oil separator 2 can achieve overall swing in the left and right and front and back directions relative to the ram 8 through the two-way hinge mechanism. When the cylinder barrel 12 swings relative to the ram 8, due to the action of the ball hinge mechanism, the lower end of the piston rod 11 will produce the same relative swing relative to the ram 8, so that the piston rod 11 can avoid being affected by the lateral force, and no additional lateral force and friction caused by the non-parallelism will be generated between the cylinder barrel 12 and the piston rod 11. When the cylinder barrel 12 swings with the oil separator 2, the hydraulic hose 23 can move, so that the oil separator 2 and the accumulator 3 will not generate additional lateral force. The accumulator 3 is installed on the side of the saddle 7 and close to the middle and lower part of the balancing cylinder 1. The connecting pipeline between the accumulator 3 and the balancing cylinder 1 is short, and the fluid pressure loss along the way is small. At the same time, the accumulator 3 and the oil distributor 2 are connected by a hydraulic hose 23, and no additional lateral force will be generated. Two interfaces are provided at the bottom of the cylinder barrel 12 of the balancing cylinder 1. The cross-sectional area and flow rate of the oil flow are large, so that the pressure fluctuation in the balancing cylinder 1 is small enough at the moment of high-speed movement of the piston rod 11. At the same time, with the accumulator 3, the oil in the balancing cylinder 1 can be quickly moved in and out, providing a stable balancing force, ensuring that the balancing force of the balancing cylinder 1 remains basically unchanged during high-speed movement, and when moving to any position, the driving load of the linear motor remains basically unchanged.

Claims

1. A high-speed balancing oil cylinder installation structure for a machine tool, wherein the piston rod of the balancing oil cylinder is vertically arranged downward, and the balancing oil cylinder is used in conjunction with an oil distributor and an accumulator, and is characterized in that: The mounting structure includes a two-way hinge mechanism and a ball hinge mechanism. The two-way hinge mechanism is arranged at the middle and lower part of the balancing oil cylinder, and the ball hinge mechanism is arranged at the bottom of the balancing oil cylinder. Two interfaces are arranged at the bottom of the cylinder barrel of the balancing oil cylinder, and each of the interfaces is connected to the oil separator block through a stainless steel pipe and a ferrule joint. The oil separator block is fixedly connected to the cylinder barrel, and the oil separator block is connected to the accumulator through a hydraulic hose. The accumulator is installed on the side of the saddle and close to the middle and lower part of the balancing oil cylinder. The two-way hinge mechanism is used to realize the left and right swinging and forward and backward swinging of the cylinder barrel relative to the slide, and the ball hinge mechanism realizes the left and right swinging and forward and backward swinging of the piston rod relative to the slide.

2. The high-speed balancing cylinder installation structure for a machine tool according to claim 1, characterized in that: The bidirectional hinge mechanism includes a fixed bracket, two first transition supports symmetrically arranged front and back, and two second transition supports symmetrically arranged left and right. The two first transition supports and the two second transition supports are fixed as a whole. The front and rear sides of the cylinder are respectively symmetrically arranged with two first rotating shafts. A first self-lubricating bearing is installed on each of the first rotating shafts. The outer ring of each of the first self-lubricating bearings is fixed on one of the first transition supports by interference fit. A second rotating shaft is installed on each of the second transition supports by interference fit. A second self-lubricating bearing is installed on each of the second rotating shafts. The outer ring of each of the second self-lubricating bearings is fixed on the fixed bracket by interference fit. The fixed bracket is fixed to the top of the saddle.

3. The high-speed balancing cylinder installation structure for a machine tool according to claim 1 or 2, characterized in that: The ball hinge mechanism includes a connecting ring, a rotating inner ring, a latch and a fixed seat. The lower end of the piston rod is threadedly connected to the connecting ring. The rotating inner ring is rotatably installed in the connecting ring. The connecting ring and the rotating inner ring are in spherical contact. The rotating inner ring is sleeved on the latch. The left and right ends of the latch are respectively installed on the fixed seat. The fixed seat is fixed to the side of the slide.

4. The high-speed balancing cylinder installation structure for a machine tool according to claim 3, characterized in that: The fixing seat is fixed on the side surface of the ram through a flat key and fixing screws.

5. The high-speed balancing cylinder installation structure for a machine tool according to claim 1, characterized in that: An oil filter muffler is installed at the air inlet and outlet at the upper end of the cylinder.

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