High-precision hydraulic center frame

Abstract

The invention relates to the technical field of hydraulic center frames, and provides a high-precision hydraulic center frame which comprises a shell, and a clamping structure is arranged in the shell. By arranging a lubricating structure, when a supporting arm drives a first rolling wheel to be folded towards the center, the supporting arm can extrude an air bag, a first one-way valve and a third one-way valve are opened, a second one-way valve is closed, a reset spring is compressed, and air can enter an oil tank through an exhaust pipe; when the rotating shaft rotates, oil in the oil tank enters the supporting seat through the oil inlet pipe and the connecting pipe, so that the rotating shaft can be conveniently lubricated, absolutely smooth, accurate and non-lagging movement of the supporting arm can be ensured, and long-term stable repeated positioning accuracy is realized; when the first one-way valve and the third one-way valve are closed and the second one-way valve is opened, the reset plate drives the air bag to reset under the elastic action of the reset spring, and air enters the air bag after being filtered by the conical filter screen, so that the stability of oil supply is conveniently maintained.

Description

Technical Field

[0001] This invention relates to the field of hydraulic center support technology, and in particular to a high-precision hydraulic center support. Background Technology

[0002] A hydraulic center rest is a precision auxiliary support device installed on a machine tool. It uses a hydraulic system to drive the support components to center and stabilize long shaft and slender shaft workpieces, thereby improving machining accuracy, suppressing machining vibration, and preventing workpiece deformation. Therefore, a high-precision hydraulic center rest is used. To this end, patent CN119566999A discloses a hydraulic center support device, relating to the technical field of workpiece holding devices. It comprises two parts: a holding device and a displacement adjustment device. The holding device is mounted on the machine tool and holds the workpiece from both horizontal and downward directions. The displacement adjustment device is located behind the holding device and adjusts the position of the holding device on the workpiece from both horizontal and downward directions. This changes the holding force in both directions to reduce workpiece deformation during holding, increasing workpiece rigidity and rotational accuracy. When installing a workpiece, this device allows for rapid workpiece centering; when unloading the workpiece, releasing the device causes the workpiece to be unloaded, ensuring the machining accuracy and efficiency of the machine tool. While the hydraulic center support device mentioned above ensures the machining accuracy and efficiency of the machine tool, its applicability is limited because it is inconvenient to lubricate the rotating shaft of the support arm, making it difficult to guarantee the absolutely smooth, precise, and unhindered movement of the support arm. Consequently, it is difficult to ensure that the support force output by the hydraulic system can be accurately and losslessly transmitted to the workpiece and achieve long-term stable repeatability of positioning accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a high-precision hydraulic center frame to solve the problem that existing high-precision hydraulic center frames are inconvenient for lubricating the rotating shaft of the support arm.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-precision hydraulic center frame, including a housing; The housing is provided with a clamping structure inside; An adjustment structure is fixed at the bottom of the housing; A lubrication structure is fixed to one side of the top of the housing. The lubrication structure includes an oil tank fixed to one side of the top of the housing. An airbag is fixed to one side of the top of the housing. A reset plate is fixed to the bottom of the airbag. A reset spring is evenly fixed to the top of the reset plate. Exhaust pipes are fixed to both sides of the top of the oil tank. Intake pipes are fixed to both ends of one side of the airbag.

[0005] Preferably, the clamping structure includes an electric push rod, a middle arm, a support arm, a first roller, a second roller, a support base, a rotating shaft, a push block, and a movable wheel. The electric push rod passes through one side of the housing. One end of the electric push rod is fixed to the middle arm. One end of the middle arm extends to the outside of the housing and is rotatably connected to the second roller. A push block is fixed to the outer side of the middle arm near the end of the electric push rod. Support arms are provided inside the housing at both ends of the middle arm. One end of each support arm extends to the outside of the housing and is rotatably connected to the first roller. The other end of each support arm is rotatably connected to a movable wheel. Support bases are fixed on the outer walls of the housing on both sides of the support arm. Rotating shafts are fixed on both sides of the support arm.

[0006] Preferably, one end of the rotating shaft extends into the interior of the support base and forms a rotating structure with the support base. When the electric push rod drives the middle arm to move, the middle arm will drive the second roller to move, and at the same time, it will drive the support arm to move through the push block and the movable wheel. The support arm will drive the rotating shaft to rotate inside the support base, thereby causing the support arm to drive the first roller to open outward or close towards the center, thus facilitating the support of the workpiece.

[0007] Preferably, one side of the movable wheel is in contact with one side of the push block. When the workpiece rotates, the first roller and the second roller roll synchronously with the workpiece, greatly reducing friction loss while maintaining support for the workpiece.

[0008] Preferably, the top of each air intake pipe extends to the outside of the housing and is threaded with a protective cover, and oil inlet pipes are fixed on both sides of the bottom of the oil tank, with connecting pipes provided below each oil inlet pipe.

[0009] Preferably, the end of the exhaust pipe furthest from the oil tank is connected to the top of the airbag. A first one-way valve is installed inside the exhaust pipe near the oil tank, and a second one-way valve is installed at the top of the intake pipe. The top of the return spring is fixedly connected to the top of the airbag. When the support arm drives the first roller to retract towards the center, the support arm compresses the airbag, opening the first and third one-way valves and closing the second one-way valve. The return spring is compressed, and gas enters the oil tank through the exhaust pipe. The oil inside the oil tank enters the support base through the oil inlet pipe and connecting pipe, facilitating lubrication of the rotating shaft. This ensures absolutely smooth, precise, and unhindered movement of the support arm and achieves long-term stable repeatability.

[0010] Preferably, a conical filter screen is fixed to the top of the protective cover, the bottom end of the oil inlet pipe is connected to the top of the support base, a third one-way valve is provided at the top of the oil inlet pipe, and both ends of the connecting pipe are connected to one end of the support base. When the first and third one-way valves are closed and the second one-way valve is open, the reset plate moves the airbag to reset under the elastic force of the reset spring. Gas enters the airbag after being filtered by the conical filter screen, thereby facilitating the maintenance of stable oil supply.

[0011] Preferably, the adjustment structure includes a fixed frame, a servo motor, a movable seat, a support plate, a movable plate, a threaded column, a handle, a movable rod, a threaded rod, and a support rod. The fixed frame is located on one side below the housing. A threaded rod is provided on one side inside the fixed frame. The movable seat is threadedly connected to the outer side of the threaded rod. A support rod passes through one side inside the movable seat. A servo motor is installed on the outer wall of the fixed frame at one end of the threaded rod. The top of the movable seat extends to the outside of the fixed frame and is fixed to the support plate. A threaded column passes through the interior of the support plate. The movable plate is rotatably connected to one end of the threaded column. A handle is fixed to the other end of the support plate. Movable rods pass through the interiors of the support plates on both sides of the threaded column.

[0012] Preferably, the top end of the movable plate is fixedly connected to the bottom end of the housing, the threaded column and the support plate are threadedly connected, the movable rod and the support plate form a sliding structure, and one end of the movable rod is fixedly connected to one side of the movable plate. When the threaded rod rotates inside the fixed frame, it drives the movable seat to move. Under the action of the support rod, the movable seat is prevented from rotating with the threaded rod. After moving, the movable seat drives the movable plate to move through the support plate, and the movable plate drives the housing to move, thereby facilitating the adjustment of the housing's position in the front-back direction.

[0013] Preferably, the movable seat and the support rod form a sliding structure. Both ends of the support rod are fixedly connected to the inner wall of the fixed frame, and one end of the threaded rod extends to the outside of the fixed frame and is fixedly connected to the output end of the servo motor. When the threaded rod drives the movable plate to move, the stability of the movable plate during movement is enhanced under the action of the movable rod. The moved movable plate will drive the housing to move, thereby facilitating the adjustment of the housing's position in the left and right directions, and thus facilitating precise support for different positions of the workpiece.

[0014] The high-precision hydraulic center support provided by this invention has the following advantages: With a lubrication structure, when the support arm drives the first roller to retract towards the center, the support arm will compress the air bladder, the first and third one-way valves will open, the second one-way valve will close, the return spring will be compressed, and the gas will enter the oil tank through the exhaust pipe. The oil inside the oil tank will enter the support seat through the oil inlet pipe and the connecting pipe, which facilitates the lubrication of the rotating shaft. This ensures that the movement of the support arm is absolutely smooth, precise and without any sticking, and achieves long-term stable repeatability accuracy. Furthermore, when the first and third check valves are closed and the second check valve is open, the reset plate moves the airbag to reset under the elastic force of the reset spring. The gas enters the airbag after being filtered by the conical filter, thus facilitating the maintenance of stable oil supply. With a clamping structure, when the electric push rod moves the middle arm, the middle arm will move the second roller. At the same time, it will move the support arm through the push block and movable wheel. The support arm will drive the rotating shaft to rotate inside the support seat, thereby causing the support arm to drive the first roller to open outward or close towards the center, thus facilitating the support of the workpiece. Furthermore, when the workpiece rotates, the first and second rollers roll synchronously with the workpiece, which greatly reduces friction loss while maintaining the supporting force on the workpiece. With the adjustment structure, when the threaded rod rotates inside the fixed frame, the threaded rod will drive the moving seat to move. Under the action of the support rod, the moving seat can be prevented from rotating with the threaded rod. After moving, the moving seat will drive the moving plate to move through the support plate, and the moving plate will drive the housing to move, thus facilitating the adjustment of the position of the housing in the front and back directions. Furthermore, when the threaded column drives the moving plate to move, the stability of the moving plate is enhanced under the action of the movable rod. After moving, the moving plate will drive the housing to move, which makes it convenient to adjust the position of the housing in the left and right directions, and thus facilitates precise support for different positions of the workpiece. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional schematic diagram of the front cross-section of the present invention; Figure 3 This is a three-dimensional schematic diagram of the main cross-sectional view of the lubrication structure of the present invention; Figure 4 This is a three-dimensional enlarged schematic diagram of the main cross-sectional view of the lubrication structure of the present invention; Figure 5 This is a three-dimensional side view cross-sectional diagram of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7This is a three-dimensional schematic diagram of the front cross-section of the clamping structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the main cross-sectional view of the adjustment structure of the present invention; Figure 9 This is a three-dimensional schematic diagram of the top cross-section of the adjustment structure of the present invention; Figure 10 This is a three-dimensional side view cross-sectional diagram of the lubrication structure of the present invention.

[0016] The following are the annotations in the diagram: 1. Housing; 2. Clamping structure; 21. Electric push rod; 22. Middle arm; 23. Support arm; 24. First roller; 25. Second roller; 26. Support seat; 27. Rotating shaft; 28. Push block; 29. ​​Movable wheel; 3. Lubrication structure; 31. Oil tank; 32. Exhaust pipe; 33. Protective cover; 34. Air inlet pipe; 35. Airbag; 36. Reset plate; 37. Reset spring; 38. Oil inlet pipe; 39. Connecting pipe; 4. Adjustment structure; 41. Fixed frame; 42. Servo motor; 43. Moving seat; 44. Support plate; 45. Moving plate; 46. Threaded column; 47. Handle; 48. Movable rod; 49. Threaded rod; 410. Support rod. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-10 The present invention provides a high-precision hydraulic center frame, comprising a housing 1, wherein a clamping structure 2 is provided inside the housing 1. The clamping structure 2 includes an electric push rod 21, a middle arm 22, a support arm 23, a first roller 24, a second roller 25, a support base 26, a rotating shaft 27, a push block 28, and a movable wheel 29. The electric push rod 21 extends through one side of the housing 1, and a middle arm 22 is fixed to one end of the electric push rod 21. One end of the middle arm 22 extends to the outside of the housing 1 and is rotatably connected to the second roller 25. The end of the middle arm 22 is close to the electric push rod 21. A push block 28 is fixed on the outside of the middle arm 22. Support arms 23 are provided inside the housings 1 at both ends of the middle arm 22. One end of each support arm 23 extends to the outside of the housing 1 and is rotatably connected to a first roller 24. The other end of each support arm 23 is rotatably connected to a movable wheel 29. Support seats 26 are fixed on the outer walls of the housings 1 on both sides of the support arm 23. Rotating shafts 27 are fixed on both sides of the support arm 23. One end of the rotating shaft 27 extends into the interior of the support seat 26 and forms a rotating structure with the support seat 26. One side of the movable wheel 29 is in contact with one side of the push block 28.

[0019] Reference Figure 2 , Figure 5 and Figure 7 As shown, when the electric push rod 21 is activated, it will drive the middle arm 22 to move, which in turn will drive the second roller 25 to move. Simultaneously, it will drive the support arm 23 to move via the push block 28 and the movable wheel 29. The support arm 23 will drive the rotating shaft 27 to rotate inside the support base 26, thereby causing the support arm 23 to drive the first roller 24 to open outward or close towards the center, thus facilitating the support of the workpiece. When the workpiece rotates, the first roller 24 and the second roller 25 will roll synchronously with the workpiece, greatly reducing friction loss while maintaining the supporting force on the workpiece.

[0020] An adjustment structure 4 is fixed to the bottom of the housing 1. The adjustment structure 4 includes a fixed frame 41, a servo motor 42, a movable seat 43, a support plate 44, a movable plate 45, a threaded column 46, a handle 47, a movable rod 48, a threaded rod 49, and a support rod 410. The fixed frame 41 is located on one side below the housing 1. A threaded rod 49 is provided on one side inside the fixed frame 41. The movable seat 43 is threaded to the outer side of the threaded rod 49. A support rod 410 passes through one side inside the movable seat 43. A servo motor 42 is installed on the outer wall of the fixed frame 41 at one end of the threaded rod 49. The top of the movable seat 43 extends to the outside of the fixed frame 41 and is fixed to the support plate 44. A support rod 410 passes through the interior of the support plate 44. A threaded column 46 has a movable plate 45 rotatably connected to one end, and a handle 47 fixed to the other end of a support plate 44. Movable rods 48 pass through the interior of the support plates 44 on both sides of the threaded column 46. The top end of the movable plate 45 is fixedly connected to the bottom end of the housing 1. The threaded column 46 and the support plate 44 are designed with a threaded connection. The movable rod 48 and the support plate 44 form a sliding structure. One end of the movable rod 48 is fixedly connected to one side of the movable plate 45. The movable seat 43 and the support rod 410 form a sliding structure. Both ends of the support rod 410 are fixedly connected to the inner wall of the fixed frame 41. One end of the threaded rod 49 extends to the outside of the fixed frame 41 and is fixedly connected to the output end of the servo motor 42.

[0021] Reference Figure 2 , Figure 3 and Figure 8 , Figure 9As shown, starting the servo motor 42 causes the threaded rod 49 to rotate inside the fixed frame 41. The threaded rod 49 drives the movable seat 43 to move, and the movable seat 43 moves outside the support rod 410. Under the action of the support rod 410, the movable seat 43 is prevented from rotating with the threaded rod 49. After moving, the movable seat 43 drives the movable plate 45 to move through the support plate 44. The movable plate 45 drives the housing 1 to move, thus facilitating the adjustment of the position of the housing 1 in the front-back direction. Turning the handle 47 causes the threaded column 46 to rotate inside the support plate 44. The threaded column 46 drives the movable plate 45 to move, and the movable plate 45 drives the movable rod 48 to move inside the support plate 44. Under the action of the movable rod 48, the stability of the movable plate 45 during movement is enhanced. After moving, the movable plate 45 drives the housing 1 to move, thus facilitating the adjustment of the position of the housing 1 in the left-right direction, and thus facilitating precise support for different positions of the workpiece.

[0022] A lubrication structure 3 is fixed to one side of the top of the housing 1. The lubrication structure 3 includes an oil tank 31 fixed to one side of the top of the housing 1, an airbag 35 fixed to one side of the top of the housing 1, a reset plate 36 fixed to the bottom of the airbag 35, and reset springs 37 evenly fixed to the top of the reset plate 36. Exhaust pipes 32 are fixed to both sides of the top of the oil tank 31, and air inlet pipes 34 are fixed to both ends of one side of the airbag 35. The tops of the air inlet pipes 34 extend to the outside of the housing 1 and are threadedly connected to protective covers 33. Oil inlet pipes 38 are fixed to both sides of the bottom of the oil tank 31. A connecting pipe 39 is provided below each of the pipes 38. The end of the exhaust pipe 32 away from the fuel tank 31 is connected to the top of the airbag 35. A first one-way valve is provided inside the exhaust pipe 32 near the fuel tank 31. A second one-way valve is provided at the top of the intake pipe 34. The top of the return spring 37 is fixedly connected to the top of the airbag 35. A conical filter screen is fixed at the top of the protective cover 33. The bottom of the oil inlet pipe 38 is connected to the top of the support base 26. A third one-way valve is provided at the top of the oil inlet pipe 38. Both ends of the connecting pipe 39 are connected to one end of the support base 26.

[0023] Reference Figure 3 , Figure 4 and Figure 5 , Figure 6As shown, when the support arm 23 drives the first roller 24 to retract towards the center, the support arm 23 will compress the air bladder 35, the first and third one-way valves will open, the second one-way valve will close, the return spring 37 will be compressed, and the gas will enter the interior of the oil tank 31 through the exhaust pipe 32. The oil inside the oil tank 31 will enter the interior of the support seat 26 through the oil inlet pipe 38 and the connecting pipe 39, thereby facilitating the lubrication of the rotating shaft 27, thus ensuring the absolute smoothness, precision and lack of sticking of the support arm 23, and achieving long-term stable repeatability positioning accuracy. When the first and third one-way valves are closed and the second one-way valve is open, under the elastic force of the return spring 37, the return plate 36 drives the air bladder 35 to return to its original position. The gas enters the interior of the air bladder 35 after being filtered by the conical filter screen, thereby facilitating the maintenance of stable oil supply.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision hydraulic center frame, comprising a housing (1); Its features are: The housing (1) is provided with a clamping structure (2) inside; An adjustment structure (4) is fixed at the bottom of the housing (1). A lubrication structure (3) is fixed on one side of the top of the housing (1). The lubrication structure (3) includes an oil tank (31) fixed on one side of the top of the housing (1). An airbag (35) is fixed on one side of the top of the housing (1). A reset plate (36) is fixed at the bottom of the airbag (35). A reset spring (37) is evenly fixed at the top of the reset plate (36). An exhaust pipe (32) is fixed on both sides of the top of the oil tank (31). An air inlet pipe (34) is fixed at both ends of one side of the airbag (35).

2. The high-precision hydraulic center frame according to claim 1, characterized in that: The clamping structure (2) includes an electric push rod (21), a middle arm (22), a support arm (23), a first roller (24), a second roller (25), a support base (26), a rotating shaft (27), a push block (28), and a movable wheel (29). The electric push rod (21) extends through one side of the housing (1). One end of the electric push rod (21) is fixed to the middle arm (22). One end of the middle arm (22) extends to the outside of the housing (1) and is rotatably connected to the second roller (25). The middle arm (22) rests against... A push block (28) is fixed on the outer side of one end of the electric push rod (21). Support arms (23) are provided inside the housings (1) at both ends of the middle arm (22). One end of the support arm (23) extends to the outside of the housing (1) and is rotatably connected to a first roller (24). The other end of the support arm (23) is rotatably connected to a movable wheel (29). Support seats (26) are fixed on the outer walls of the housings (1) on both sides of the support arm (23). Rotating shafts (27) are fixed on both sides of the support arm (23).

3. A high-precision hydraulic center frame according to claim 2, characterized in that: One end of the rotating shaft (27) extends into the interior of the support base (26) and forms a rotating structure with the support base (26).

4. A high-precision hydraulic center support according to claim 2, characterized in that: One side of the movable wheel (29) is in contact with one side of the push block (28).

5. A high-precision hydraulic center frame according to claim 2, characterized in that: The top of each air intake pipe (34) extends to the outside of the housing (1) and is threaded with a protective cover (33). Both sides of the bottom of the oil tank (31) are fixed with oil inlet pipes (38), and a connecting pipe (39) is provided below each oil inlet pipe (38).

6. A high-precision hydraulic center support according to claim 1, characterized in that: The end of the exhaust pipe (32) away from the fuel tank (31) is connected to the top of the airbag (35). A first one-way valve is provided inside the exhaust pipe (32) near the fuel tank (31). A second one-way valve is provided at the top of the air intake pipe (34). The top of the return spring (37) is fixedly connected to the top of the airbag (35).

7. A high-precision hydraulic center frame according to claim 5, characterized in that: The top of the protective cover (33) is fixed with a conical filter screen, the bottom of the oil inlet pipe (38) is connected to the top of the support base (26), the top of the oil inlet pipe (38) is provided with a third one-way valve, and both ends of the connecting pipe (39) are connected to one end of the support base (26).

8. A high-precision hydraulic center frame according to claim 1, characterized in that: The adjustment structure (4) includes a fixed frame (41), a servo motor (42), a movable seat (43), a support plate (44), a movable plate (45), a threaded column (46), a handle (47), a movable rod (48), a threaded rod (49), and a support rod (410). The fixed frame (41) is located on one side below the housing (1). A threaded rod (49) is provided on one side inside the fixed frame (41). The movable seat (43) is threaded to the outer side of the threaded rod (49). A support rod (410) passes through one side inside the movable seat (43). The support rod (410) has a servo motor (42) installed on the outer wall of the fixed frame (41) at one end of the threaded rod (49). The top of the movable seat (43) extends to the outside of the fixed frame (41) and is fixed with a support plate (44). A threaded column (46) runs through the inside of the support plate (44). A movable plate (45) is rotatably connected to one end of the threaded column (46). A handle (47) is fixed to the other end of the support plate (44). Movable rods (48) run through the inside of the support plates (44) on both sides of the threaded column (46).

9. A high-precision hydraulic center support according to claim 8, characterized in that: The top end of the movable plate (45) is fixedly connected to the bottom end of the housing (1). The threaded column (46) and the support plate (44) are designed with a threaded connection. The movable rod (48) and the support plate (44) form a sliding structure. One end of the movable rod (48) is fixedly connected to one side of the movable plate (45).

10. A high-precision hydraulic center frame according to claim 8, characterized in that: The movable seat (43) and the support rod (410) form a sliding structure. Both ends of the support rod (410) are fixedly connected to the inner wall of the fixed frame (41). One end of the threaded rod (49) extends to the outside of the fixed frame (41) and is fixedly connected to the output end of the servo motor (42).

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