Rapid oil return system of static pressure rotary table

Abstract

The invention discloses a rapid oil return system of a static pressure rotary table. The rapid oil return system of the static pressure rotary table comprises an oil tank, a workbench, a base and a Venturi tube assembly. Wherein the workbench is provided with an oil cavity and a mounting channel, the oil cavity is arranged at the bottom of the workbench in the circumferential direction of the workbench, and the oil cavity is communicated with the oil tank through a liquid inlet pipe; an annular flow guide groove is formed in the base, the workbench is rotatably installed on the base, and the annular flow guide groove is used for collecting oil overflowing from the oil cavity; the Venturi tube assembly is arranged in the mounting channel, and the Venturi tube assembly enables oil in the annular flow guide groove to flow back to the oil tank rapidly by generating negative pressure. The problem that in the prior art, the oil return speed of a hydrostatic pressure rotary table cannot be matched with large-flow oil supply, oil is left on the surface of a lathe bed, thermal deformation of the lathe bed is caused, and then precision machining precision is affected can be solved at least.

Description

Technical Field

[0001] This invention relates to the field of hydrostatic technology, and more specifically, to a rapid oil return system for a hydrostatic rotary table. Background Technology

[0002] In existing technologies, the oil return system of hydrostatic rotary tables mostly adopts a design of natural reflux + simple guide channel, relying solely on the gravity of the oil to achieve oil return. However, this oil return method suffers from slow return speed, which cannot match the large oil supply flow. A large amount of unrecovered oil remains on the surface and in the gaps of the rotary table bed. During rotary table operation, the temperature of this retained oil continues to rise due to the combined effects of frictional power consumption and the power consumption of the oil supply system. This heat is transferred to the bed body through heat conduction, leading to a high risk of thermal deformation of the bed and affecting the precision machining accuracy. In addition, the untimely oil return also results in redundant design volume of the oil tank, high cost, and occupation of equipment installation space. Summary of the Invention

[0003] The main objective of this invention is to provide a rapid oil return system for hydrostatic rotary tables, which at least solves the problem in the prior art that the oil return speed of hydrostatic rotary tables cannot match the large flow rate of oil supply, resulting in oil stagnation on the bed surface and causing thermal deformation of the bed, thus affecting the precision machining accuracy.

[0004] According to one aspect of the present invention, a rapid oil return system for a hydrostatic rotary table is provided, comprising: tank; A workbench is provided with an oil cavity and an installation channel. The oil cavity is located at the bottom of the workbench along the circumferential direction and is connected to the oil tank through an inlet pipe. A base is provided with an annular guide groove, and the worktable is rotatably mounted on the base. The annular guide groove is used to collect the oil overflowing from the oil chamber. A venturi tube assembly is disposed within the installation channel. The venturi tube assembly generates negative pressure to cause the oil in the annular guide groove to flow back quickly to the oil tank.

[0005] Furthermore, the venturi assembly includes: The main body is provided with a jet channel and an oil suction channel. The jet channel is arranged to extend through the main body along the axial direction. The oil suction channel is arranged on the side wall of the main body near the annular guide groove and communicates with the jet channel. The outlet end of the jet channel is connected to the oil tank. A nozzle is connected to the inlet end of the jet channel and is used to inject gas into the jet channel to generate negative pressure.

[0006] Furthermore, the jet channel includes an oil inlet channel section, a throat section, and an oil outlet channel section connected in sequence. The cross-sectional area of ​​the oil inlet channel section gradually decreases near the end of the throat section and extends along the length of the throat section. The cross-sectional area of ​​the throat section remains unchanged. The cross-sectional area of ​​the oil outlet channel section gradually increases. The nozzle is connected to the oil inlet channel section, and the oil inlet channel section is connected to the oil suction channel.

[0007] Furthermore, the nozzle is provided with an air delivery channel, and the cross-sectional area of ​​the air delivery channel gradually decreases along the direction close to the throat section.

[0008] Furthermore, the main body includes an oil inlet pipe and an oil outlet pipe connected to the oil inlet pipe. The oil inlet channel section is disposed inside the oil inlet pipe and communicates with the oil suction channel. The throat section and the oil outlet channel section are disposed inside the oil outlet pipe.

[0009] Furthermore, the nozzle is connected to the oil inlet pipe, and the oil inlet pipe is connected to the oil outlet pipe via threads.

[0010] Furthermore, the hydrostatic rotary table rapid oil return system also includes an air source, which is connected to the air inlet of the nozzle via a pipeline.

[0011] Furthermore, the workbench is provided with at least one mounting channel extending radially along the workbench, and two Venturi tube assemblies are provided in the mounting channel. The air source is connected to the mounting channel through a pipe, and the pipe is located between the air inlet ends of the nozzles of the two Venturi tube assemblies.

[0012] Furthermore, the hydrostatic rotary table rapid oil return system also includes an air filter, which is disposed between the air source and the venturi tube assembly; and / or, The hydrostatic rotary table rapid oil return system also includes a pressure reducing valve, which is disposed between the air filter and the venturi tube assembly; and / or, The hydrostatic rotary table rapid oil return system also includes a pressure gauge, which is installed on the pipeline between the pressure reducing valve and the Venturi tube assembly.

[0013] Furthermore, the hydrostatic rotary table rapid oil return system also includes an oil-gas separation device, which is installed inside the oil tank and is used to separate the oil-gas mixture ejected from the outlet end of the Venturi tube assembly.

[0014] In this invention, the negative pressure generated by the Venturi effect of the Venturi tube assembly set on the worktable accelerates the return of oil, which can quickly remove the oil stagnating in the annular guide groove on the base. This not only matches the large flow rate of oil supply, but also avoids thermal deformation caused by the heat conducted to the base due to the oil heating up, thereby improving the machining accuracy of the hydrostatic turntable. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a cross-sectional view of the overall structure of the hydrostatic rotary table rapid oil return system disclosed in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a portion of region A in the middle; Figure 3 for Figure 1 A magnified view of a portion of region B in the middle; Figure 4 This is a flowchart illustrating the rapid oil return system of the hydrostatic rotary table disclosed in an embodiment of the present invention.

[0016] The above figures include the following reference numerals: 10. Oil tank; 20. Workbench; 21. Oil chamber; 22. Installation channel; 30. Base; 31. Annular guide groove; 40. Venturi tube assembly; 41. Main body; 411. Jet channel; 4111. Oil inlet channel section; 4112. Throat section; 4113. Oil outlet channel section; 412. Oil suction channel; 413. Oil inlet pipe; 414. Oil outlet pipe; 42. Nozzle; 421. Air supply channel; 50. Air source; 51. Pipeline; 52. Air filter; 53. Pressure reducing valve; 54. Pressure gauge; 60. Liquid inlet pipe. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] As mentioned in the background section, in existing technologies, the oil return speed of a hydrostatic rotary table cannot match the large-flow oil supply, causing oil to stagnate on the bed surface and leading to thermal deformation of the bed, thus affecting precision machining accuracy. To address this, this application provides a rapid oil return system for a hydrostatic rotary table. This system uses a Venturi tube assembly on the worktable to generate negative pressure, causing the oil in the guide grooves on the bed to quickly flow back to the oil tank. This avoids oil stagnation on the bed surface and prevents thermal deformation, thereby improving precision machining accuracy. The rapid oil return system of this application will be described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 4 As shown in the embodiment of this application, a hydrostatic rotary table rapid oil return system is provided, which includes: an oil tank 10, a worktable 20, a base 30, and a venturi tube assembly 40.

[0022] Specifically, the workbench 20 is provided with an oil chamber 21 and an installation channel 22. The oil chamber 21 is located at the bottom of the workbench 20 along the circumferential direction of the workbench 20 and is connected to the oil tank 10 through an inlet pipe 60. The base 30 is provided with an annular guide groove 31. The workbench 20 is rotatably mounted on the base 30. The annular guide groove 31 is used to collect the oil overflowing from the oil chamber 21. The Venturi tube assembly 40 is located in the installation channel 22. The Venturi tube assembly 40 generates negative pressure to make the oil in the annular guide groove 31 flow back to the oil tank 10 quickly.

[0023] In actual operation, the annular guide groove 31 on the base 30 is height-matched to the bottom of the worktable 20. Oil overflowing circumferentially from the oil chamber 21 can directly fall into the annular guide groove 31, preventing disorderly diffusion of oil on the surface of the base 30 and improving collection efficiency. Simultaneously, this application utilizes a Venturi tube assembly 40 on the worktable 20 to generate directional suction through negative pressure, rapidly drawing oil out of the annular guide groove 31. This not only improves the return flow rate, meeting the demands of high-flow-rate oil supply, but also reduces oil retention in the annular guide groove 31, preventing deformation of the base 30 due to increased temperature of retained oil, thus affecting precision machining accuracy. Furthermore, by employing the Venturi tube assembly 40 for rapid oil return, this application ensures a smooth oil outlet path in the oil chamber 21, keeping the pressure in the oil chamber 21 consistently within the design range, guaranteeing oil film stability, and consequently ensuring the operational accuracy of the worktable 20. Furthermore, this application embeds the Venturi tube assembly 40 into the mounting channel 22 of the worktable 20, eliminating the need for piping outside the base 30 or the worktable 20, thus achieving integrated installation and reducing the volume of the hydrostatic turntable.

[0024] Furthermore, in actual operation, the core of the hydrostatic turntable relies on the stable thickness of the oil film in the oil chamber 21. Current technology relies on gravity for oil return, which is slow. To address the potential issue of insufficient oil in the oil tank 10 due to delayed oil return, it is necessary to increase the volume of the oil tank 10 to "buffer" the amount of oil retained—that is, to reserve more space in the oil tank 10 to store the oil needed to maintain system circulation even when oil return is delayed. However, an excessively large oil tank 10 increases manufacturing costs and occupies equipment installation space, hindering the miniaturization and integration of precision machining equipment. Moreover, an increased volume in the oil tank 10 reduces the oil's heat dissipation efficiency, exacerbating the oil temperature rise problem and creating a vicious cycle of "slow oil return → larger oil tank 10 → higher oil temperature." This application achieves rapid oil return by using a Venturi tube assembly 40 to generate negative pressure. Rapid oil return under negative pressure significantly reduces oil retention, eliminating the need to increase the volume of the oil tank 10 for oil buffering, and thus significantly reducing the design size of the oil tank 10. Understandably, this design not only reduces material consumption in the manufacture of the oil tank 10, lowering equipment production costs, but also saves equipment installation space, better meeting the demands of precision heavy-duty machining equipment towards integration and miniaturization, and improving the flexibility of equipment in workshop layout.

[0025] In other words, this application uses the Venturi effect of the Venturi tube assembly 40 set on the worktable 20 to form a negative pressure to accelerate oil return, which can quickly remove the oil stagnating in the annular guide groove 31 on the base 30. This not only matches the large flow rate of oil supply, but also avoids thermal deformation caused by the heat conducted to the base 30 due to the oil heating, thereby improving the machining accuracy of the hydrostatic turntable.

[0026] like Figure 2 and Figure 3 As shown, the Venturi tube assembly 40 includes a main body 41 and a nozzle 42. The main body 41 is provided with a jet channel 411 and an oil suction channel 412. The jet channel 411 extends through the main body 41 along its axial direction. The oil suction channel 412 is located on the side wall of the main body 41 near the annular guide groove 31 and communicates with the jet channel 411. The outlet end of the jet channel 411 is connected to the oil tank 10. The nozzle 42 is connected to the inlet end of the jet channel 411 and is used to inject gas into the jet channel 411 to generate negative pressure.

[0027] Understandably, the Venturi tube assembly 40 maximizes the efficiency and stability of negative pressure generation through directional jetting via nozzle 42 and smooth flow guidance via jet channel 411. Specifically, nozzle 42 is connected to the inlet end of jet channel 411, which can "concentrate and accelerate" compressed air (or other gases). After the gas passes through the constricted flow channel of nozzle 42, the flow velocity is greatly increased, forming a high-speed jet that enters jet channel 411. Compared to "direct airflow without nozzle 42", nozzle 42 can avoid airflow diffusion, ensuring that the airflow enters jet channel 411 in a state of "high kinetic energy and low disturbance", providing a stable high-speed airflow basis for negative pressure generation. Jet channel 411 runs through the main body 41 axially without unnecessary bends or abrupt changes in cross-section. The high-speed airflow can maintain a streamlined flow within jet channel 411, avoiding the generation of vortices due to obstruction by jet channel 411. According to Bernoulli's principle, when the high-speed airflow flows through the jet channel 411, the static pressure in the jet channel 411 is significantly reduced. Because the jet channel 411 is unobstructed and the airflow is not stagnant, the negative pressure intensity and coverage are stable, and there will be no situation where the negative pressure is sometimes present and sometimes absent. This ensures that the oil suction channel 412 continuously generates suction and ensures the reliability of oil suction.

[0028] Furthermore, in this application, the oil suction channel 412 is located on the side wall of the main body 41 near the annular guide groove 31. The oil suction channel 412 is close to the oil, shortening the suction distance. Moreover, the oil suction channel 412 is directly connected to the jet channel 411, allowing the negative pressure within the jet channel 411 to be transmitted to the inlet of the oil suction channel 412 without attenuation. Compared to the oil suction channel 412 being indirectly connected via multiple joints, this avoids pressure loss at the joints, ensuring that the suction force at the oil suction port is sufficient for the oil. Even if the amount of oil in the annular guide groove 31 is small, it can be completely sucked away without residue, improving the efficiency and thoroughness of oil return. Simultaneously, the jet channel 411 and the oil suction channel 412 are integrated onto a single main body 41, reducing space occupation and adapting to the installation space of the hydrostatic turntable.

[0029] like Figure 3As shown, the jet channel 411 includes an oil inlet channel section 4111, a throat section 4112, and an oil outlet channel section 4113 connected in sequence. The cross-sectional area of ​​the oil inlet channel section 4111 near the end of the throat section 4112 gradually decreases and extends along the length of the throat section 4112. The cross-sectional area of ​​the throat section 4112 remains unchanged. The cross-sectional area of ​​the oil outlet channel section 4113 gradually increases. The nozzle 42 is connected to the oil inlet channel section 4111, and the oil inlet channel section 4111 is connected to the oil suction channel 412.

[0030] Specifically, the cross-sectional area of ​​the oil inlet channel section 4111 gradually decreases at the end near the throat section 4112. According to the fluid mechanics "continuity equation" (flow rate = velocity × cross-sectional area; when the flow rate is constant, a decrease in cross-sectional area leads to an increase in velocity), the compressed air injected by the nozzle 42 will gradually accelerate as the cross-sectional area decreases after entering the contracting oil inlet channel section 4111. At the same time, according to Bernoulli's principle, the increase in velocity is accompanied by a decrease in static pressure, creating a preliminary low-pressure zone within the oil inlet channel section 4111. This low-pressure zone is connected to the oil suction channel 412, which can generate preliminary suction force on the oil in the annular guide groove 31 in advance, preventing oil from accumulating at the oil suction port. The oil suction channel 412 is connected to the oil inlet channel section 4111 (rather than directly connected to the throat section 4112). After the oil is initially sucked in, it will first undergo preliminary atomization and mixing in the accelerated airflow of the contraction section before entering the throat section 4112. This can prevent high-viscosity oil from agglomerating due to sudden changes in flow rate, which could lead to blockage of the throat section 4112. The premixing in the oil inlet channel section 4111 can significantly reduce the risk of blockage and ensure a continuous and smooth return of oil.

[0031] Furthermore, after the airflow accelerated by the oil inlet channel section 4111 enters the throat section 4112, the cross-sectional area reaches its minimum and remains constant, the flow velocity reaches its maximum, and the corresponding static pressure drops to its minimum. The peak negative pressure is transmitted to the annular guide groove 31 through the oil suction channel 412, generating a strong and stable suction force. Even if there are a small amount of impurities in the oil in the annular guide groove 31, they can be sucked in, avoiding oil residue. Extending along the length of the throat section 4112, the cross-sectional area of ​​the throat section 4112 remains unchanged, ensuring that the airflow forms a uniform streamline flow in this area, without eddies or backflow caused by abrupt changes in cross-section. This, in turn, forms a stable negative pressure to ensure stable oil suction, preventing the oil from stagnating and heating up in the annular guide groove 31, and ensuring the stability of the oil film on the hydrostatic turntable. Specifically, in the actual design process, the minimum cross-sectional area of ​​the throat section 4112 can be designed according to the oil viscosity.

[0032] Furthermore, the gradually increasing cross-sectional area of ​​the oil outlet section 4113 allows the velocity of the high-speed oil-gas mixture exiting the throat section 4112 to gradually decrease, enabling synchronous recovery of static pressure, reducing transport resistance, and ensuring smooth flow of the oil-gas mixture along the pipeline without splashing or stagnation. Moreover, as the velocity of the oil-gas mixture decreases in the diffuser section, oil droplets undergo initial settling due to gravity (larger droplets separate from the airflow first and flow along the wall). After entering the oil tank 10, only fine oil mist needs to be processed, significantly reducing the load on the oil-gas treatment device within the oil tank 10 and minimizing oil loss. Simultaneously, the gradually increasing cross-sectional area of ​​the oil outlet section 4113 also significantly reduces the impact of airflow on the pipeline, minimizing vibration and ensuring that the operating accuracy of the hydrostatic turntable is not affected by the return oil system.

[0033] In other words, the sequentially connected oil inlet channel section 4111, throat section 4112, and oil outlet channel section 4113 of the jet channel 411 work together to construct a complete oil return link that achieves efficient oil suction, stable mixing, and smooth delivery.

[0034] See you again Figure 3 As shown, an air delivery channel 421 is provided inside the nozzle 42. The cross-sectional area of ​​the air delivery channel 421 gradually decreases along the direction near the throat section 4112. This design allows the converging air delivery channel 421 to efficiently convert the pressure energy of compressed air into kinetic energy, providing a prerequisite for the formation of a strong negative pressure in the subsequent throat section 4112. Simultaneously, the gradual contraction of the air delivery channel 421 optimizes the airflow direction and flow field stability, preventing negative pressure fluctuations from affecting the return oil speed; it also reduces compressed air waste and lowers air source energy consumption through precise acceleration. Furthermore, the high-speed airflow output from the gradually converging air delivery channel 421 has stronger shearing force. When the airflow enters the oil inlet section 4111 and comes into contact with the oil sucked in by the oil suction channel 412, it can quickly tear the oil into tiny droplets, achieving premixing. If the air delivery channel 421 were a straight channel, the airflow velocity would be low and the shearing force weak, making it easy for the oil to form oil strands or clumps. Upon entering the throat section 4112, this could lead to blockage due to the smallest cross-section (especially for high-viscosity oils).

[0035] like Figure 3As shown, the main body 41 includes an oil inlet pipe 413 and an oil outlet pipe 414 connected to the oil inlet pipe 413. An oil inlet channel section 4111 is disposed within the oil inlet pipe 413 and communicates with an oil suction channel 412. A throat section 4112 and an oil outlet channel section 4113 are disposed within the oil outlet pipe 414. It is understood that in this application, by adopting a split design for the Venturi tube assembly 40, the complex channel can be broken down into simple units, significantly reducing the processing difficulty. Specifically, only the oil inlet channel section 4111 (contraction type) and the oil suction channel 412 need to be processed on the oil inlet pipe 413, while the throat section 4112 (equal diameter minimum cross-section) and the oil outlet channel section 4113 (diffusion type) need to be processed on the oil outlet pipe 414, reducing processing difficulty and ensuring the accuracy of the channel. Simultaneously, the split design allows for partial replacement and reduces the maintenance cost of the Venturi tube assembly 40. Furthermore, in this application, the Venturi tube assembly 40 is installed in the mounting channel 22 on the workbench 20. The space is narrow, and the integrated structure, due to its long length, may interfere with the inner wall of the mounting channel 22 during assembly. The split design allows for segmented assembly, which is suitable for the limited space of the workbench 20.

[0036] Furthermore, the nozzle 42 and the oil inlet pipe 413, as well as the oil inlet pipe 413 and the oil outlet pipe 414, are all connected by threads. Understandably, threaded connections allow for quick assembly and disassembly, significantly reducing maintenance costs and downtime. In actual engineering, threaded connections can achieve double sealing through a spiral seal and an auxiliary seal, preventing compressed air leakage at the connection point and thus ensuring negative pressure failure. This ensures that the airflow is fully used for negative pressure production, preventing oil return interruption and oil stagnation on the annular guide groove 31 due to leakage. Moreover, the performance of the Venturi tube assembly 40 (negative pressure strength, airflow stability) is highly dependent on the coaxiality of each channel section. If the nozzle 42 and the oil inlet channel section 4111 are not coaxial, the airflow will deflect upon entry, causing turbulent flow and negative pressure fluctuations in the throat section 4112. If the oil suction channel 412 of the oil inlet pipe 413 is not aligned with the annular guide groove 31, "oil suction port misalignment" will occur, making efficient oil collection impossible. Threaded connections allow for fine-tuning during assembly, ensuring channel coaxiality and oil suction alignment accuracy. In this application, the use of threaded connections achieves a compact and low-cost structure, adaptable to the limited installation space of hydrostatic turntables. Specifically, threaded connections eliminate the need for additional flanges or snap-fit ​​structures, allowing for easy installation into narrow passages; furthermore, threading is a mature technology with low processing costs.

[0037] like Figure 4As shown, the hydrostatic rotary table rapid oil return system also includes an air source 50, which is connected to the air inlet of the nozzle 42 via a pipe 51. For example, the air source 50 can be an air compressor, a compressed air tank, etc. The air source 50 can continuously output compressed air at a stable pressure, which is directionally delivered to the nozzle 42 via the pipe 51, ensuring that the nozzle 42 always has a sufficient flow and pressure of airflow to ensure stable negative pressure generation and achieve rapid oil return. Furthermore, the independent air source 50 ensures that the oil return system is independent of the main hydraulic system, avoiding mutual interference.

[0038] like Figure 1 and Figure 2 As shown, the workbench 20 has at least one mounting channel 22 extending radially along the workbench 20. Two Venturi tube assemblies 40 are installed within the mounting channel 22. An air source 50 is connected to the mounting channel 22 via a pipe 51, which is positioned between the air inlet ends of the nozzles 42 of the two Venturi tube assemblies 40. It is understood that in some applications, only one mounting channel 22 can be provided on the workbench 20, and only one Venturi tube assembly 40 can be installed within this mounting channel 22 to generate negative pressure for rapid oil return. In other embodiments, multiple mounting channels 22 can be provided on the workbench 20 at predetermined intervals, and only one or two Venturi tube assemblies 40 can be installed within each of the multiple mounting channels 22. When multiple mounting channels 22 are provided on the workbench 20, rapid oil return can be achieved by supplying air through only one air source 50. In actual production, setting multiple mounting channels 22 and installing multiple Venturi tube assemblies 40 within each mounting channel 22 increases production costs and results in design redundancy. Therefore, in actual production, the quantity of installation channels 22 and venturi tube assemblies 40 is adjusted according to actual needs.

[0039] In this application, Figure 1 and Figure 2 The diagram shows a configuration where only one mounting channel 22 is provided on the worktable 20, and two Venturi tube assemblies 40 are arranged within this mounting channel 22. The mounting channel 22 extends radially along the worktable 20, which facilitates the installation of the Venturi tube assemblies 40 and oil return.

[0040] Specifically, in actual operation, the annular guide groove 31 is distributed circumferentially along the worktable 20, and due to the centrifugal force of the rotating worktable 20, the oil will naturally shift radially outward (especially during high-speed rotation). A single Venturi tube assembly 40 is insufficient to cover the "full radial range" (inner and outer rings) of the annular guide groove 31. In this application, two Venturi tube assemblies 40 are arranged in the radial mounting channel 22 along the radial direction of the worktable 20 (one near the inner ring of the annular guide groove 31 and one near the outer ring of the annular guide groove 31), respectively corresponding to the "inner ring oil area" and "outer ring oil area" of the annular guide groove 31—avoiding that a single Venturi tube assembly 40 can only adsorb local oil, achieving full-area oil absorption without dead corners in the annular guide groove 31, and improving the oil return coverage rate. The two Venturi tube assemblies 40 generate negative pressure simultaneously, forming a "radially continuous negative pressure zone". The oil will flow radially towards the two oil suction channels 412 in the annular guide groove 31, avoiding the oil from stagnating in a certain area due to viscosity or centrifugal force. The return oil speed is increased, which is especially suitable for the high flow rate return oil demand when the turntable rotates at high speed.

[0041] Meanwhile, the worktable 20 rotates during operation, and the oil within the annular guide groove 31 is subjected to centrifugal force, moving radially outward. The radially extending installation channel 22 allows the two Venturi tube assemblies 40 to cover the centrifugal force offset zone. Furthermore, the two Venturi tube assemblies 40 are arranged radially, and the negative pressure field generated during rotation rotates synchronously with the worktable 20, forming a "dynamic full-area negative pressure zone." The oil remains within the negative pressure coverage area throughout the rotation process, preventing interruption of oil suction due to changes in rotation direction (forward or reverse) or speed. If the hydrostatic rotary table's oil return system relies solely on a single Venturi tube assembly 40, the oil return function will completely fail if the assembly fails. Using at least two Venturi tube assemblies 40 improves system reliability and reduces downtime losses.

[0042] Furthermore, the pipe 51 of the air source 50 is located between the air inlet ends of the nozzles 42 of the two Venturi tube assemblies 40. Specifically, the internal space of the static pressure turntable is limited. If separate pipes 51 for the air source 50 are provided for the two Venturi tube assemblies 40, it would result in pipe intersections, occupying a large space and increasing air consumption. In this application, using a single air source 50 to supply air to the two Venturi tube assemblies 40 not only simplifies the number of equipment and optimizes the pipe layout, but also reduces production costs.

[0043] like Figure 4As shown, the hydrostatic rotary table's rapid oil return system also includes an air filter 52, which is located between the air source 50 and the Venturi tube assembly 40. This air filter 52 can purify the compressed air output from the air source 50, removing dust, oil mist, moisture, etc., thereby preventing blockage and wear of the Venturi tube assembly 40 and extending its service life. It also ensures the cleanliness of the return oil, preventing impurities from entering the oil circulation and indirectly protecting the core precision of the hydrostatic rotary table.

[0044] Furthermore, the hydrostatic rotary table's rapid oil return system also includes a pressure reducing valve 53, which is located between the air filter 52 and the Venturi tube assembly 40. During actual operation, the negative pressure intensity of the Venturi tube assembly 40 is directly related to the intake pressure. The pressure reducing valve 53 can stabilize the airflow pressure passing through the air filter 52 at the set value required by the Venturi tube assembly 40, achieving controllable negative pressure and system safety. Specifically, according to the Venturi principle, the negative pressure intensity is positively correlated with the intake pressure. The pressure reducing valve 53 can reduce the fluctuating pressure of the air source 50 to a constant set value, ensuring no fluctuation in negative pressure intensity and thus guaranteeing a consistent oil absorption rate. The pressure reducing valve 53 can limit the maximum output pressure, preventing abnormal overpressure of the air source 50 from damaging the Venturi tube assembly 40 (such as nozzle 42 rupture or pipe 51 collapse); simultaneously, reducing the pressure to the set value can reduce compressed air consumption and lower the operating load of the air compressor.

[0045] Furthermore, the hydrostatic rotary table's rapid oil return system also includes a pressure gauge 54, which is installed on the pipe 51 between the pressure reducing valve 53 and the venturi tube assembly 40. Located downstream of the pressure reducing valve 53, the pressure gauge 54 verifies the pressure stabilizing effect of the valve, provides early warning of abnormal pressure, and assists in system debugging. In some applications, this pressure gauge 54 can be configured as a feedback-enabled pressure gauge, allowing for automatic adjustment based on detection results, ensuring the stability and safety of the system operation.

[0046] In other words, in this application, the air filter 52, pressure reducing valve 53, and pressure gauge 54 form a collaborative link of "pretreatment → control → monitoring", which can improve the negative pressure stability of the venturi tube assembly 40, reduce the failure rate, and indirectly ensure the oil film stability (no impurities contaminating the oil) and processing accuracy (no thermal deformation caused by oil accumulation) of the hydrostatic turntable.

[0047] Furthermore, the hydrostatic rotary table's rapid oil return system also includes an oil-gas separator (not shown in the figure). This separator is located inside the oil tank 10 and is used to separate the oil-gas mixture ejected from the outlet of the Venturi tube assembly 40. Understandably, during actual operation, the oil drawn in by the Venturi tube assembly 40 under negative pressure mixes with compressed air to form an oil-gas mixture. If this mixture is directly discharged into the oil tank 10 without separation, a large amount of oil will be discharged with the air, resulting in waste. This oil-gas separator uses principles such as inertial impaction, centrifugal separation, or filtration to cause the oil to settle to the bottom of the oil tank 10 and re-enter the hydraulic circulation system, while the separated air is discharged through the exhaust port of the oil tank 10, achieving both oil recycling and gas emission. This design not only achieves efficient oil recycling and reuse, reducing operating costs, but also avoids oil mist accumulation, ensuring system safety and environmental cleanliness. In addition, the oil-water separator can reduce the contact time and area between the oil and air, delay oil oxidation, and ensure the performance of the hydraulic system; it can also avoid cavitation and oil film instability, thereby ensuring the accuracy of the hydrostatic turntable.

[0048] like Figure 4 As shown in this application, when the hydrostatic rotary table is started, the working process of the hydrostatic rotary table rapid oil return system is as follows: Oil supply to oil chamber 21 and levitation of worktable 20: A constant flow hydraulic source (such as a multi-head pump) continuously supplies pressurized oil to oil chamber 21. The pressurized oil forms a stable oil film within oil chamber 21, smoothly leviting worktable 20 and creating a contactless gap between worktable 20 and base 30, meeting the basic requirements for high-precision rotation of the turntable. During this process, some pressurized oil overflows along the sealing edge of oil chamber 21 and flows naturally into the annular guide groove 31, forming stagnant oil to be recovered.

[0049] Air source 50 start-up and airflow pretreatment: At the same time as oil supply to oil chamber 21 begins, the control system triggers the start-up of air source 50. The compressed air output by air source 50 passes through air filter 52 and pressure reducing valve 53 in sequence. Air filter 52 removes impurities in the airflow, and pressure reducing valve 53 stabilizes the air pressure to the working pressure required by venturi tube assembly 40.

[0050] Negative pressure adsorption and oil delivery: Reduced pressure compressed air enters the Venturi tube assembly 40, where it accelerates in the contraction section, creating negative pressure in the oil inlet channel section 4111. This negative pressure generates directional suction through the oil suction channel 412 of the worktable 20, rapidly drawing the stagnant oil in the annular guide groove 31 into the suction channel 412. After entering the Venturi tube assembly 40, the oil mixes with the high-speed airflow to form an oil-gas mixture. This mixture is further accelerated through the throat section 4112 and the oil outlet channel section 4113 of the Venturi tube assembly 40, and then delivered to the oil tank 10 through the oil outlet pipe 414. Inside the oil tank 10, the oil-gas mixture is separated by an oil-gas separator. The lubricating oil settles to the bottom of the oil tank 10 and re-enters the hydraulic circulation system, while the separated air is discharged through the exhaust port of the oil tank 10, achieving oil recycling and gas discharge.

[0051] As can be seen from the above embodiments, the hydrostatic rotary table rapid oil return system provided in this application has at least the following technical effects: (1) This application sets up an installation channel 22 on the workbench 20 and sets up a Venturi tube assembly 40 in the installation channel 22. The negative pressure is formed by the Venturi effect to accelerate the return of oil and quickly remove the oil that is stuck on the surface of the base 30. This avoids the heat from the oil temperature rise being conducted to the base 30 and causing thermal deformation, thereby ensuring the structural stability of the base 30.

[0052] (2) This application uses a venturi tube assembly 40 to generate negative pressure to achieve rapid oil return in the annular guide channel 31. The rapid oil return under negative pressure can significantly reduce the amount of oil retained, eliminating the need to increase the volume of the oil tank 10 for oil buffering, and significantly reducing the design size of the oil tank 10. In this way, not only is the material consumption for manufacturing the oil tank 10 reduced, thus lowering the equipment production cost, but also the equipment installation space is saved, making it more suitable for the demand for integration and miniaturization of precision heavy-duty machining equipment, and improving the flexibility of the equipment in the workshop layout.

[0053] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0054] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid oil return system for a hydrostatic rotary table, characterized in that, include: Fuel tank (10); A workbench (20) is provided with an oil cavity (21) and an installation channel (22). The oil cavity (21) is located at the bottom of the workbench (20) along the circumferential direction. The oil cavity (21) is connected to the oil tank (10) through an inlet pipe (60). The base (30) is provided with an annular guide groove (31), and the worktable (20) is rotatably mounted on the base (30). The annular guide groove (31) is used to collect the oil overflowing from the oil chamber (21). Venturi tube assembly (40), which is disposed in the installation channel (22), generates negative pressure to cause the oil in the annular guide groove (31) to flow back to the oil tank (10) quickly.

2. The hydrostatic rotary table rapid oil return system according to claim 1, characterized in that, The Venturi tube assembly (40) includes: The main body (41) is provided with a jet channel (411) and an oil suction channel (412). The jet channel (411) is provided through the main body (41) along the axial direction. The oil suction channel (412) is provided on the side wall of the main body (41) near the annular guide groove (31) and is connected to the jet channel (411). The outlet end of the jet channel (411) is connected to the oil tank (10). Nozzle (42), which is connected to the inlet end of the jet channel (411), is used to inject gas into the jet channel (411) to generate negative pressure.

3. The hydrostatic rotary table rapid oil return system according to claim 2, characterized in that, The jet channel (411) includes an oil inlet channel section (4111), a throat section (4112), and an oil outlet channel section (4113) connected in sequence. The cross-sectional area of ​​the oil inlet channel section (4111) near the end of the throat section (4112) gradually decreases and extends along the length of the throat section (4112). The cross-sectional area of ​​the throat section (4112) remains unchanged. The cross-sectional area of ​​the oil outlet channel section (4113) gradually increases. The nozzle (42) is connected to the oil inlet channel section (4111). The oil inlet channel section (4111) is connected to the oil suction channel (412).

4. The hydrostatic rotary table rapid oil return system according to claim 3, characterized in that, The nozzle (42) is provided with an air delivery channel (421), and the cross-sectional area of ​​the air delivery channel (421) gradually decreases along the direction close to the throat section (4112).

5. The hydrostatic rotary table rapid oil return system according to claim 3, characterized in that, The main body (41) includes an oil inlet pipe (413) and an oil outlet pipe (414) connected to the oil inlet pipe (413). The oil inlet channel section (4111) is disposed in the oil inlet pipe (413) and communicates with the oil suction channel (412). The throat section (4112) and the oil outlet channel section (4113) are disposed in the oil outlet pipe (414).

6. The hydrostatic rotary table rapid oil return system according to claim 5, characterized in that, The nozzle (42) and the oil inlet pipe (413), and the oil inlet pipe (413) and the oil outlet pipe (414) are all connected by threads.

7. The hydrostatic rotary table rapid oil return system according to claim 2, characterized in that, The hydrostatic turntable rapid oil return system also includes an air source (50), which is connected to the air inlet of the nozzle (42) through a pipe (51).

8. The hydrostatic rotary table rapid oil return system according to claim 7, characterized in that, The workbench (20) is provided with at least one installation channel (22) extending radially along the workbench (20), and two Venturi tube assemblies (40) are provided in the installation channel (22). The air source (50) is connected to the installation channel (22) through a pipe (51), and the pipe (51) is located between the air inlet ends of the nozzles (42) of the two Venturi tube assemblies (40).

9. The hydrostatic rotary table rapid oil return system according to claim 8, characterized in that, The hydrostatic rotary table rapid oil return system also includes an air filter (52), which is disposed between the air source (50) and the venturi assembly (40); and / or, The hydrostatic rotary table rapid oil return system also includes a pressure reducing valve (53), which is disposed between the air filter (52) and the venturi assembly (40); and / or, The hydrostatic turntable rapid oil return system also includes a pressure gauge (54), which is installed on the pipeline (51) between the pressure reducing valve (53) and the venturi tube assembly (40).

10. The hydrostatic rotary table rapid oil return system according to any one of claims 1 to 9, characterized in that, The hydrostatic turntable rapid oil return system also includes an oil-gas separation device, which is installed inside the oil tank (10). The oil-gas separation device is used to separate the oil-gas mixture ejected from the outlet end of the Venturi tube assembly (40).

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