High speed machine tool oil cavity with increased annular oil supply groove and connecting channel

Abstract

The application discloses a high-speed machine tool oil cavity with an oil sealing edge, an annular oil supply groove and a connecting channel, and belongs to the technical field of high-speed machine tool oil cavities. The oil sealing edge is connected with the top of the oil cavity. A rotary table bearing surface is rotatably connected to the top of the oil sealing edge. An annular oil groove is arranged at the top of the oil sealing edge. A guide mechanism is connected in the annular oil groove. An equalizing mechanism is arranged on the inner side of the oil sealing edge. The bottom side of the equalizing mechanism is connected with the inlet of the oil cavity at the bottom of the oil sealing edge. In the application, when the hydraulic oil is pumped, the hydraulic oil can enter the annular oil groove at the top through the connecting overflow groove, so that the hydraulic oil can fill the oil sealing edge, the hydraulic oil can be more easily and fully supplemented into the oil sealing edge, and the dry friction phenomenon caused by the insufficient supplement of the hydraulic oil in the oil sealing edge during the high-speed rotation of the rotary table bearing surface is avoided. The temperature rise and oil film collapse caused by the shearing force of the rotary table rotating wall surface on the lubricating oil flow field are solved.

Description

Technical Field

[0001] This invention belongs to the field of high-speed machine tool oil cavity technology, and particularly relates to a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the oil sealing edge. Background Technology

[0002] High-end CNC machine tool rotary tables employing hydrostatic support systems possess advantages such as high load-bearing capacity, good vibration resistance, high operating speed, long service life, and good stability. They are widely used in modern large-scale high-end CNC machine tools, becoming crucial components. Within the CNC machine tool rotary table system, the performance of the hydrostatic oil chamber is a key factor directly determining the overall performance of the rotary table system.

[0003] With the increasing processing speed of parts, the rotational speed of CNC machine tools is also constantly increasing. When the machine tool rotates at high speed, the problems of temperature rise and lubrication failure caused by hydraulic oil friction resistance and temperature viscosity effect urgently need to be solved. At present, research on the design of oil cavity structure in CNC machine tools focuses more on the macroscopic oil cavity structure to improve the oil film stiffness and load-bearing capacity. However, there is a lack of reasonable solutions for the problem of temperature rise of hydraulic oil at the sealing edge due to friction during high-speed rotation. At the same time, there is also the problem of oil film collapse caused by the shear force of the wall on the lubricating oil flow field due to the rotation of the turntable. Chinese patent application publication number: CN106439005B discloses a circular oil pad with an arc groove sealing edge for hydrostatic turntable, but the flow rate of the arc groove is small, the drag reduction effect is limited, and its structure is not easy to process, so there is room for improvement. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of insufficient lubricating oil in the sealing edge and increased shear resistance of the turntable by proposing a high-speed machine tool oil chamber with an annular oil supply groove and connecting channel added to the sealing edge.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the sealing edge includes an oil sealing edge connected to the top of the oil cavity. A turntable bearing surface is rotatably connected to the top of the oil sealing edge. An annular oil groove is provided on the top of the oil sealing edge, and a guiding mechanism is connected inside the annular oil groove. A pressure equalization mechanism is provided on the inner side of the oil sealing edge, and the bottom side of the pressure equalization mechanism is connected to the oil cavity inlet at the bottom of the oil sealing edge.

[0007] An oil overflow groove is provided on the inner side of the sealing edge, and the oil overflow groove is connected to one side of the annular oil groove to guide the oil in the oil cavity to quickly contact the turntable bearing surface through the oil overflow groove.

[0008] As a further description of the above technical solution:

[0009] The guiding mechanism includes an oil storage tank connected to the top of an annular oil tank. The inner cavity of the oil storage tank is connected to multiple liquid inlets, and the liquid inlets are connected to the top of the corresponding overflow tank. The inner cavity of the oil storage tank is connected to multiple guiding protrusions through guiding blocks to guide the distribution direction of the overflow oil.

[0010] As a further description of the above technical solution:

[0011] The guide bump has an open triangular cross-sectional shape, and multiple guide bumps are arranged in the same direction to guide the oil flow and enhance the damping resistance with the oil.

[0012] As a further description of the above technical solution:

[0013] The cross-sectional shape of the connecting oil overflow channel is circular, and the connecting oil overflow channels are arranged in an L-shape.

[0014] As a further description of the above technical solution:

[0015] The pressure equalization mechanism includes an outer sheath connected to the inner side of the oil sealing edge, and a support plate connected to the inner side of the outer sheath. The support plate has multiple overflow holes at its top, and a pressure ring is slidably connected to the inner cavity of the outer sheath. Elastic bladders are connected to the top of the pressure ring around its perimeter, and the top of the elastic bladders is connected to the inner side of the outer sheath. A plug ball is connected to the bottom side of the pressure ring and is slidably connected to the overflow hole. The oil backflow is controlled by the sliding of the plug ball in the overflow hole. The outer side of the outer sheath is connected to one end of the overflow groove.

[0016] As a further description of the above technical solution:

[0017] The elastic bladder is an elastic plastic capsule, and the cross-sectional shape of the elastic bladder is arc-shaped.

[0018] As a further description of the above technical solution:

[0019] The number of connecting oil overflow tanks is 6-12, and the diameter is 5-10mm.

[0020] As a further description of the above technical solution:

[0021] The annular oil groove has a depth of 1-2 mm and a width of 10-20 mm.

[0022] As a further description of the above technical solution:

[0023] The end of the oil overflow tank near the annular oil tank is connected to a buffer sleeve, and the inner side of the buffer sleeve is connected with equal-distance liquid equalization teeth.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In this invention, by adding an annular oil groove, when hydraulic oil is pumped in, it can enter the top annular oil groove through the connection of the overflow groove. This ensures the oil film bearing capacity while allowing the hydraulic oil to fill the sealing edge, making it easier for the hydraulic oil to fully replenish the sealing edge. This avoids the dry friction phenomenon that occurs when the hydraulic oil in the sealing edge is not fully replenished when the turntable bearing surface rotates at high speed. This solves the problem of temperature rise and oil film collapse caused by the shear force of the turntable rotating wall acting on the lubricating oil flow field.

[0026] 2. In this invention, through the designed guiding mechanism, when the oil enters the oil storage tank, the guiding protrusions can be arranged in a spiral shape to improve the fit with the bearing surface of the top turntable. Furthermore, the oil film can increase the resistance to contact through the arrangement of the guiding protrusions. In addition, the oil storage tank and the internal guiding protrusions can be pre-stamped before installation, reducing the processing difficulty and improving the guiding effect after oil replenishment.

[0027] 3. In this invention, when the oil is fed into the sealing edge through the oil cavity inlet, the oil can enter the outer sheath through the bottom pipe of the outer sheath. At this time, the oil pressure can push up the plug ball and enter the support plate to push it out. Through multiple sets of plug balls, the oil is pumped in in equal quantities, which helps to avoid uneven liquid inlet in the top annular oil groove from affecting the filling uniformity. After the oil is soaked, the elasticity of the elastic bag drives the pressure ring and the plug ball to slide into the overflow hole, sealing the overflow hole and preventing the oil from returning to its original position through the overflow hole. This helps to improve the pumping effect and the stabilization effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the sealing edge, as proposed in this invention.

[0029] Figure 2 This is an exploded structural diagram of a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the sealing edge, as proposed in this invention.

[0030] Figure 3 This is a schematic diagram of the overall structure of a guide mechanism for a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel at the sealing edge, as proposed in this invention.

[0031] Figure 4 This is a side half-section diagram of the oil cavity of a high-speed machine tool with an added annular oil supply groove and connecting channel on the oil sealing edge, as proposed in this invention.

[0032] Figure 5 The present invention proposes Figure 4 Enlarged structural diagram of part A in the middle;

[0033] Figure 6This is a schematic diagram of the lateral explosion structure of a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the sealing edge, as proposed in this invention.

[0034] Figure 7 The present invention proposes Figure 6 Enlarged structural diagram of part B.

[0035] Legend:

[0036] 1. Oil sealing edge; 2. Turntable bearing surface; 3. Guiding mechanism; 301. Oil storage tank; 302. Guide block; 303. Guide protrusion; 304. Liquid inlet; 4. Pressure equalization mechanism; 401. Outer sleeve; 402. Support plate; 403. Blocking ball; 404. Elastic bladder; 405. Overflow hole; 406. Pressure ring; 5. Buffer sleeve; 6. Liquid equalization teeth; 7. Connecting overflow tank; 8. Annular oil tank. Detailed Implementation

[0037] 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.

[0038] Please see Figure 1-7 The present invention provides a technical solution: a high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the oil sealing edge 1, including an oil sealing edge 1 connected to the top of the oil cavity, a turntable bearing surface 2 rotatably connected to the top of the oil sealing edge 1, an annular oil groove 8 provided on the top of the oil sealing edge 1, a guide mechanism 3 connected inside the annular oil groove 8, and a pressure equalization mechanism 4 provided on the inner side of the oil sealing edge 1, and the bottom side of the pressure equalization mechanism 4 connected to the bottom oil cavity inlet of the oil sealing edge 1;

[0039] The inner side of the sealing edge 1 is provided with a connecting overflow groove 7, and the connecting overflow groove 7 is connected to one side of the annular oil groove 8. It is used to guide the oil in the oil cavity to quickly contact the turntable bearing surface 2 through the connecting overflow groove 7. The connecting overflow groove 7 has a circular cross-sectional shape and is arranged in an L-shape. The number of connecting overflow grooves 7 is 6-12, and the diameter is 5-10mm. The annular oil groove 8 has a depth of 1-2mm and a width of 10-20mm.

[0040] The specific implementation method is as follows: By adding an annular oil groove 8, when hydraulic oil is pumped in, it can enter the top annular oil groove 8 through the connection of the overflow groove. This ensures the oil film bearing capacity while allowing the hydraulic oil to fill the sealing edge 1. This makes it easier for the hydraulic oil to fully replenish the sealing edge 1, avoiding the dry friction phenomenon caused by insufficient hydraulic oil replenishment in the sealing edge 1 when the turntable bearing surface 2 rotates at high speed. This solves the problem of temperature rise and oil film collapse caused by the shear force of the turntable rotating wall acting on the lubricating oil flow field.

[0041] Please see Figure 3 The guiding mechanism 3 includes an oil storage tank 301, which is connected to the top of the annular oil tank 8. The inner cavity of the oil storage tank 301 is connected to multiple liquid inlets 304, and the liquid inlets 304 are connected to the top of the corresponding overflow tank 7. The inner cavity of the oil storage tank 301 is connected to multiple guiding protrusions 303 through guiding blocks 302, which are used to guide the distribution direction of the overflow oil. The cross-sectional shape of the guiding protrusions 303 is an open triangle, and the multiple guiding protrusions 303 are arranged in the same direction, which are used to guide the distribution of oil and enhance the damping resistance with the oil.

[0042] The specific implementation method is as follows: When the oil enters the oil storage tank 301 through the designed guide mechanism 3, it can be arranged in a spiral shape by the guide protrusions 303 to improve the contact effect with the bearing surface 2 of the top turntable. The oil film can also increase the resistance to contact through the arrangement of the guide protrusions 303. Furthermore, the oil storage tank 301 and the internal guide protrusions 303 can be pre-stamped before installation, which reduces the processing difficulty and improves the guiding effect after oil replenishment.

[0043] Please see Figure 6-7 The pressure equalization mechanism 4 includes an outer sheath 401, which is connected to the inner side of the oil sealing edge 1. A support plate 402 is connected to the inner side of the outer sheath 401, and the top of the support plate 402 has multiple overflow holes 405. A pressure ring 406 is slidably connected to the inner cavity of the outer sheath 401, and elastic bladders 404 are connected to the top of the pressure ring 406 around its perimeter. The top of the elastic bladders 404 is connected to the inner side of the outer sheath 401. A ball plug 403 is connected to the bottom side of the pressure ring 406, and the ball plug 403 is slidably connected to the inner side of the outer sheath 401. The oil overflow hole 405 is dynamically connected. Due to the sliding control of the plug ball 403 in the oil overflow hole 405, the backflow of oil is controlled. The outer side of the outer sleeve 401 is connected to one end of the oil overflow groove 7. The elastic bladder 404 is an elastic plastic capsule with an arc-shaped cross-section. The end of the oil overflow groove 7 near the annular oil groove 8 is connected to a buffer sleeve 5, and the inner side of the buffer sleeve 5 is equidistantly connected with liquid equalization teeth 6. The designed buffer sleeve 5 can ensure the stability and uniformity of oil overflow.

[0044] The specific implementation method is as follows: When the oil is sent into the sealing edge 1 through the oil cavity inlet, the oil can enter the outer sheath 401 through the bottom pipe of the outer sheath 401. At this time, the oil pressure of the oil can push up the plug ball 403 and enter the support plate 402 to push it out. Thus, the oil can be pumped in in equal quantities through multiple sets of plug balls 403, which helps to avoid uneven liquid inlet of the top annular oil groove 8 affecting the filling uniformity. In addition, through the designed elastic bag 404, after the oil is wetted, the elasticity of the elastic bag 404 can drive the pressure ring 406 and the plug ball 403 to slide into the overflow hole 405, thereby sealing the overflow hole 405 and preventing the oil from returning to its original position through the overflow hole 405, which helps to improve the pumping effect and the stabilization effect.

[0045] Working principle: When the hydraulic oil is pumped in, it can enter the top annular oil groove 8 through the overflow groove. This ensures the oil film bearing capacity while filling the sealing edge 1 with hydraulic oil, making it easier for the hydraulic oil to fully replenish the sealing edge 1. This avoids the dry friction phenomenon that occurs when the hydraulic oil in the sealing edge 1 is not fully replenished when the turntable bearing surface 2 rotates at high speed.

[0046] When the oil enters the oil storage tank 301, it can be spirally arranged by the guide protrusions 303 to improve the contact effect with the bearing surface 2 of the top turntable. The oil film can also increase the resistance to contact through the arrangement of the guide protrusions 303. The oil storage tank 301 and the internal guide protrusions 303 can be pre-stamped before the device is installed.

[0047] When the oil is fed into the sealing edge 1 through the oil cavity inlet, the oil can enter the outer sheath 401 through the bottom pipe of the outer sheath 401. At this time, the oil pressure can push up the plug ball 403 and enter the support plate 402 to push it out. Through multiple sets of plug balls 403, the oil is pumped in in equal quantities, which helps to avoid uneven liquid inlet of the top annular oil groove 8 from affecting the filling uniformity. After the oil is soaked, the elasticity of the elastic bag 404 can drive the pressure ring 406 and the plug ball 403 to slide into the overflow hole 405.

[0048] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-speed machine tool oil cavity with an added annular oil supply groove and connecting channel on the sealing edge, comprising an oil sealing edge (1) connected to the top of the oil cavity, wherein a turntable bearing surface (2) is rotatably connected to the top of the oil sealing edge (1), characterized in that, The top of the sealing edge (1) is provided with an annular oil groove (8), and a guide mechanism (3) is connected inside the annular oil groove (8). The inner side of the sealing edge (1) is provided with a pressure equalization mechanism (4), and the bottom side of the pressure equalization mechanism (4) is connected to the bottom oil cavity inlet of the sealing edge (1). The inner side of the sealing edge (1) is provided with a connecting overflow groove (7), and the connecting overflow groove (7) is connected to one side of the annular oil groove (8) to guide the oil in the oil cavity to quickly contact the turntable bearing surface (2) through the connecting overflow groove (7); The guiding mechanism (3) includes an oil storage tank (301), which is connected to the top of the annular oil tank (8). The inner cavity of the oil storage tank (301) is connected to multiple liquid inlets (304), and the liquid inlets (304) are connected to the top of the corresponding oil overflow tank (7). The inner cavity of the oil storage tank (301) is connected to multiple guiding protrusions (303) through guiding blocks (302) to guide the distribution direction of the overflow oil. The pressure equalization mechanism (4) includes an outer sheath (401), which is connected to the inner side of the oil sealing edge (1). A support plate (402) is connected to the inner side of the outer sheath (401), and multiple overflow holes (405) are opened on the top of the support plate (402). A pressure ring (406) is slidably connected to the inner cavity of the outer sheath (401), and elastic bladders (404) are connected to the top of the pressure ring (406) around its perimeter. The top of the elastic bladders (404) is connected to the inner side of the outer sheath (401). A plug ball (403) is connected to the bottom side of the pressure ring (406), and the plug ball (403) is slidably connected to the overflow hole (405). Since the oil backflow is controlled by the sliding of the plug ball (403) in the overflow hole (405), the outer side of the outer sheath (401) is connected to one end of the overflow groove (7).

2. The high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel at the sealing edge according to claim 1, characterized in that, The guide bump (303) has an open triangular cross-section and multiple guide bumps (303) are arranged in the same direction to guide the oil distribution and enhance the damping resistance with the oil.

3. The high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel at the sealing edge according to claim 1, characterized in that, The cross-sectional shape of the connecting oil overflow tank (7) is circular, and the connecting oil overflow tank (7) is arranged in an L-shape.

4. The high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel on the oil sealing edge according to claim 1, characterized in that, The elastic bladder (404) is an elastic plastic capsule, and the cross-sectional shape of the elastic bladder (404) is arc-shaped.

5. A high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel at the sealing edge according to claim 1, characterized in that, The number of the connecting oil overflow tanks (7) is 6-12, and the diameter is 5-10mm.

6. The high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel on the oil sealing edge according to claim 1, characterized in that, The annular oil groove (8) has a depth of 1-2 mm and a width of 10-20 mm.

7. A high-speed machine tool oil chamber with an added annular oil supply groove and connecting channel at the sealing edge according to claim 1, characterized in that, The end of the oil overflow tank (7) near the annular oil tank (8) is connected to a buffer sleeve (5), and the inner side of the buffer sleeve (5) is connected with equal-spaced liquid equalization teeth (6).

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