A double V-shaped hydrostatic guide with film feedback throttling

Abstract

The present invention discloses a double V-shaped liquid hydrostatic guide rail for diaphragm feedback throttling, comprising a base, a fixed guide rail, a first sliding guide rail, a slider, a double diaphragm feedback throttle, a valve seat, and a second sliding guide rail; the fixed guide rail is fixed on the base, and a first sliding guide rail and a second sliding guide rail slidably connected to the fixed guide rail are respectively arranged on both sides of the fixed guide rail, and the surfaces of the first sliding guide rail and the second sliding guide rail matching with the fixed guide rail are V-shaped, and an oil cavity is arranged on the V-shaped matching surfaces of the first sliding guide rail and the second sliding guide rail; the first sliding guide rail and the second sliding guide rail are fixedly connected to the slider, and the valve seat is fixed on the side of the slider, the left and right ends of the valve seat are connected to the first double diaphragm feedback throttle, and the right end is connected to the second double diaphragm feedback throttle; a total oil inlet hole is arranged on the valve seat, and the total oil inlet hole simultaneously supplies oil to the first and second double diaphragm feedback throttles, and the first and second double diaphragm feedback throttles jointly supply oil to the oil cavity.

Description

Technical Field

[0001] The invention belongs to the field of liquid hydrostatic guide rails, and in particular relates to a double V-shaped liquid hydrostatic guide rail with film feedback throttling. Background Art

[0002] As the main component of machine tools, the design and processing quality of the guide rail system have an important impact on the overall machine tool. At present, most of the high-level ultra-precision machine tools at home and abroad use liquid hydrostatic guide rails. Liquid hydrostatic guide rails are divided into open hydrostatic guide rails and closed hydrostatic guide rails according to their structural form. Compared with open hydrostatic guide rails, closed hydrostatic guide rails have higher oil film stiffness, stronger anti-overturning ability and higher precision stability.

[0003] At present, domestic and foreign enterprises focus on analyzing and improving the dynamic and static characteristics of hydrostatic guideways. The research methods generally combine traditional engineering design methods and computer simulation technology, and verify and improve the research plan through experiments. The research directions mainly include oil pad structure, oil pad size, throttle form and oil supply system design, etc. The content involves optimizing the form and size of each component to improve the stiffness and bearing capacity of the guideway. The stiffness and bearing capacity of the guideway have an important influence on the mechanical system. High-rigidity guideways can reduce the elastic deformation caused by load, thereby maintaining the precise relative position between mechanical components, which is especially important for machine tools and equipment that require high-precision positioning; under dynamic load or vibration conditions, high-rigidity guideways can reduce the vibration amplitude of the system and improve the stability of the overall structure, thereby ensuring stable and precise processing.

[0004] In patent CN202410056578.2, a preloaded open static pressure guide rail and a control method are disclosed, which include a bed, on which a planar fixed guide rail and a V-shaped fixed groove are horizontally arranged, and the planar fixed guide rail and the V-shaped fixed groove are parallel to each other; a workbench is connected with a planar floating guide rail and a V-shaped floating guide rail, the planar floating guide rail is located above the planar fixed guide rail, and the V-shaped floating guide rail is embedded in the V-shaped fixed groove and can slide along the V-shaped fixed groove; a static pressure device is used to input hydraulic oil into the gap between the V-shaped floating guide rail and the V-shaped fixed groove, and to input hydraulic oil into the gap between the planar floating guide rail and the planar fixed guide rail. The invention adopts an open hydrostatic guide rail, in which there is only hydrostatic support at the bottom of the guide rail. The lack of hydrostatic support at the top will inevitably reduce the vertical stiffness of the guide rail and reduce the movement accuracy. Although it compensates for this deficiency to a certain extent by controlling the magnetic force of the magnets, the large number of magnets makes the assembly and control system of the guide rail more complicated, the cost increases and it cannot completely make up for the disadvantages brought by the open hydrostatic guide rail; in addition, the invention adopts an integrated throttle, and each oil chamber requires an integrated throttle, which is complicated to manufacture and cannot quickly respond to changes in the guide rail load; the throttle is located at the head and tail of the guide rail. The two different positions increase the difficulty of the hydraulic station to supply oil to the throttle, and also make the oil circuit in the guide rail too long, which increases the difficulty of guide rail processing and manufacturing. Moreover, the too long oil circuit will cause the oil pressure and oil film thickness to be unevenly distributed on the guide rail, affecting the load-bearing performance of the guide rail.

[0005] In patent CN202122786257.2, a double V-shaped liquid hydrostatic guide rail is disclosed. The utility model only describes the general appearance structure of the guide rail and the slider, and does not mention the throttling form and the circulation of lubricating oil. Although each oil chamber can provide support in the vertical and horizontal directions, compared with the conventional liquid hydrostatic guide rail, the double V-shaped structure provides better anti-overturning ability while reducing the vertical rigidity and load-bearing capacity of the guide rail; the utility model adopts an inner slider structure, which is less rigid, stable and adjustable than the outer slider structure, and is difficult to process. Summary of the invention

[0006] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a double V-shaped liquid hydrostatic guide rail with film feedback throttling.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A double V-shaped liquid static pressure guide rail for film feedback throttling, comprising a base, a fixed guide rail, a first sliding guide rail, a slider, a double film feedback throttle, a valve seat, and a second sliding guide rail;

[0009] The fixed guide rail is fixed on the base, and a first sliding guide rail and a second sliding guide rail are respectively arranged on both sides of the fixed guide rail to be slidably connected thereto, and the surfaces where the first sliding guide rail and the second sliding guide rail match the fixed guide rail are V-shaped, and an oil cavity is arranged on the V-shaped matching surfaces of the first sliding guide rail and the second sliding guide rail;

[0010] The first sliding guide rail and the second sliding guide rail are fixedly connected to the slider, and a valve seat is fixed on the side of the slider, one end of the valve seat is connected to the first double-film feedback throttle, and the other end is connected to the second double-film feedback throttle; an oil inlet hole is provided on the valve seat, and the oil inlet hole supplies oil to the first and second double-film feedback throttles at the same time, and the oil chamber of the first sliding guide rail is jointly supplied with oil by the oil circuits in the first double-film feedback throttle and the second double-film feedback throttle, and the oil chamber of the second sliding guide rail is also jointly supplied with oil by the oil circuits in the first double-film feedback throttle and the second double-film feedback throttle.

[0011] As a further technical solution, the two oil outlet holes close to the valve seat in the first and second double diaphragm feedback throttles supply oil to the oil chamber of the first sliding guide rail through the first oil circuit on the slider; the two oil outlet holes away from the valve seat in the first and second double diaphragm feedback throttles supply oil to the oil chamber of the second sliding guide rail through the second oil circuit on the slider.

[0012] As a further technical solution, the middle part of the slider is a hollow structure, and the second oil circuit includes two sections, one section is located on the side where the first oil circuit is located, and the other section is located on the opposite side, and the two oil circuits are connected by a high-pressure oil pipe.

[0013] As a further technical solution, four oil chambers are arranged on the V-shaped surface of the first sliding guide rail, two of which are located on the upper V-shaped surface, and the other two are located on the lower V-shaped surface, and the oil chambers on the upper and lower V-shaped surfaces are symmetrically arranged.

[0014] As a further technical solution, four oil chambers are arranged on the V-shaped surface of the second sliding guide rail, two of which are located on the upper V-shaped surface, and the other two are located on the lower V-shaped surface, and the oil chambers on the upper and lower V-shaped surfaces are symmetrically arranged.

[0015] As a further technical solution, in the first sliding guide rail and the second sliding guide rail, the two oil chambers symmetrical in vertical direction are supplied with oil by the same double-film feedback throttle.

[0016] As a further technical solution, the oil chamber is in the shape of a triangular prism.

[0017] As a further technical solution, each double-diaphragm feedback throttle includes a first film and a second film, and the double-diaphragm feedback throttle is divided into three parts with the first film and the second film as the boundary, and the three parts are connected into a whole by bolts; an oil inlet hole connected to the oil inlet hole is arranged at one end of the double-diaphragm feedback throttle, and four oil outlet holes are arranged on the side of the double-diaphragm feedback throttle, two symmetrically arranged regulating chambers are formed on both sides of the first film, and two symmetrically arranged regulating chambers are formed on both sides of the second film, and a connecting oil circuit is arranged inside the double-diaphragm feedback throttle, and the lubricating oil entering from the oil inlet hole enters the four regulating chambers through the connecting oil circuit and flows out from the four oil outlet holes.

[0018] As a further technical solution, the two adjustment chambers on both sides of the same film correspond to a set of upper and lower oil chambers of a sliding guide rail.

[0019] As a further technical solution, each double membrane feedback throttle is a cylindrical throttle.

[0020] The control method of the above-mentioned double V-shaped liquid hydrostatic guide rail with film feedback throttling is as follows:

[0021] The diaphragm feedback throttle is mainly composed of a diaphragm, an adjustment chamber and a throttling gap. When the fluid passes through the throttle, the deformation degree of the diaphragm is related to the pressure difference of the lubricating oil in the adjustment chambers on both sides of the diaphragm, and the oil pressure depends on the pressure of the guide rail oil chamber connected to the adjustment chamber; the greater the pressure on the guide rail, the greater the pressure difference on the diaphragm, and the greater the deformation degree. The deformation of the diaphragm in turn affects the opening of the throttling gap. Therefore, the diaphragm feedback throttle adjusts the deformation of the diaphragm and the size of the throttling gap in real time according to the load of the guide rail, thereby controlling the pressure and flow of the lubricating oil flowing into the guide rail oil chamber, balancing the guide rail load, and keeping its movement in a stable state.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention aims to solve the technical problems existing in the current technology and proposes a double V-shaped liquid hydrostatic guide rail with film feedback throttling; its two double film feedback throttles are fixed on the side of the guide rail and connected through a valve seat; this design simplifies the oil circuit for the hydraulic station to supply oil to the throttle, shortens the distance for the throttle to supply oil to the oil chamber, and the oil circuit is short and direct, ensuring uniform distribution of oil pressure and oil film thickness, and enabling the film feedback throttle to better exert its rapid response capability; at the same time, by designing the oil circuits of the two double film feedback throttles and the first sliding guide rail and the second sliding guide rail, the oil in the two double film feedback throttles can be The holes cross to supply oil to the two slide rails (that is, the two oil outlet holes near the valve seat in the first and second double film feedback throttles supply oil to the oil cavity of the first sliding guide rail through the first oil circuit on the slider; the two oil outlet holes away from the valve seat in the first and second double film feedback throttles supply oil to the oil cavity of the second sliding guide rail through the second oil circuit on the slider), rather than one double film feedback throttle corresponding to one slide rail, which greatly simplifies the oil circuit in the slider, allows the lubricating oil to quickly reach the oil cavity, and ensures uniform distribution of oil pressure and oil film thickness and the rapid response capability of the film feedback throttle. If a double film feedback throttle corresponds to one slide rail, the length of the four oil circuits will increase, the number of turns will increase, which not only increases the difficulty of processing and design, but also has an adverse effect on the performance of the guide rail.

[0024] At the same time, the lubricating oil of the second sliding guide rail in the present invention is not delivered by drilling holes in the slider, but by hollowing out the middle area of ​​the slider to connect the high-pressure oil pipe to deliver the lubricating oil. This method reduces the distance of the lubricating oil flowing through the metal material, thereby reducing the friction between the impurities in the oil film and the guide rail, thereby ensuring the accuracy of the guide rail movement; at the same time, the total mass of the outer slider structure is reduced, further improving the guide rail bearing capacity.

[0025] 2. The outer slider structure adopted by the guide rail of the present invention further improves the rigidity, adjustability and overall load-bearing capacity of the guide rail compared to the inner slider structure; the guide rail adopts a closed liquid hydrostatic guide rail structure, which has better rigidity in the vertical direction, better torque bearing capacity, better stability and motion accuracy than the open guide rail. The diaphragm feedback throttle of the present invention can respond quickly according to the load of the guide rail, provide the guide rail with higher rigidity and motion accuracy, solve the problem of insufficient vertical rigidity of the double V-type guide rail, and make it have excellent anti-overturning ability and rigidity at the same time; compared to configuring an integrated throttle for each oil chamber, the use of a diaphragm feedback throttle has a faster response, and each double diaphragm feedback throttle can supply oil to four oil chambers at the same time, which facilitates the design and processing of the oil circuit, reduces manufacturing cost and maintenance cost, and is convenient for installation.

[0026] 3. The double-film feedback throttle abandons the traditional square structure and adopts a circular structure. While ensuring its excellent throttling ability, it optimizes the process and is easier to process.

[0027] 4. The oil chamber structure of the present invention does not adopt the conventional rectangular oil chamber parallel to the fixed guide rail, but is designed as a triangular prism-like oil chamber structure. This structure can ensure the bearing capacity, rigidity and motion accuracy of the guide rail, while optimizing the manufacturing process and making it more convenient to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 The double V-shaped liquid static pressure guide rail with film feedback throttling disclosed in the embodiment of the present invention

[0030] Schematic diagram;

[0031] Figure 2 It is a schematic diagram of a thin film feedback throttle disclosed in the embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the structure of the double-film feedback throttle disclosed in the embodiment of the present invention (the red arrow represents the flow direction of the lubricating oil);

[0033] Figure 4 It is a schematic diagram of the oil circuit structure of the slider disclosed in the embodiment of the present invention;

[0034] FIG5( a ) and FIG5( b ) are schematic diagrams of a first sliding guide rail partially disclosed in an embodiment of the present invention;

[0035] Figure 6 (a), Figure 6 (b) is a schematic diagram of a first sliding guide rail disclosed in part of an embodiment of the present invention;

[0036] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for illustration only.

[0037] 1. Base, 2. Fixed guide rail, 3. Second sliding guide rail, 4. Slider, 5. Valve plate, 6. Double membrane reaction

[0038] Feed throttle, 7. valve seat, 8. first sliding guide rail;

[0039] 71. Oil inlet hole, 72 threaded hole;

[0040] 61. first film, 62. second film, 63. bolt, 64. sealing ring, 65. sealing ring, 66. oil inlet hole, 67. oil outlet hole, 68. adjusting chamber A, 69. adjusting chamber B, 610. adjusting chamber C, 611. adjusting chamber D;

[0041] 41. First oil circuit, 42. Oil outlet hole A, 43. Second oil circuit, 44. Third oil circuit, 45. Oil outlet hole B, 46. Threaded hole;

[0042] 31. Oil chamber A, 32. Oil outlet hole A, 33. Oil outlet hole B, 34. Oil inlet hole, 35. Oil drain groove, 36. Oil chamber B

[0043] 81. Oil chamber A, 82. Oil outlet hole A, 83. Oil outlet hole B, 84. Oil inlet hole, 85. Oil drain groove, 86. Oil chamber B DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0046] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0047] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0048] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present invention proposes a double V-shaped liquid hydrostatic guide rail with film feedback throttling.

[0049] In a typical embodiment of the present invention, Figure 1 As shown in the figure, a double V-type hydrostatic guide rail with film feedback throttling is proposed. The V-type guide rail has certain advantages and disadvantages. The advantage is that it has good anti-overturning ability, and the disadvantage is that its oil film carries the guide rail in both horizontal and vertical directions. Compared with the traditional oil film mainly carrying the guide rail in the vertical direction, the vertical bearing capacity of the V-type guide rail is weak. The film feedback throttle has good rigidity. After the V-type guide rail is combined with the throttle, the rigidity of the guide rail itself can be improved, and the performance of the guide rail can be improved, so that it has excellent rigidity and anti-overturning ability. In addition, the present invention reduces the weight of the guide rail as a whole and optimizes the oil circuit structure, thereby further improving the rigidity of the guide rail. Generally speaking, the throttle is divided into a fixed throttle and a variable throttle. The liquid resistance of the former remains unchanged during the support process, while the liquid resistance of the latter changes adaptively with the change of the external load during the support process. Although the former has a simple structural design, the latter has greater support rigidity and bearing capacity. The film feedback throttle used in this design belongs to a variable throttle.

[0050] The present invention proposes a double V-shaped liquid hydrostatic guide rail in the form of film feedback throttling, such as Figure 1 The core components of the guide rail system are shown. The double V-shaped guide rail structure designed by the present invention can provide better rigidity and anti-overturning ability compared to conventional square guide rails, and improve the ability to cope with complex load conditions. Although the inner slider is compact and has a smaller mass, the outer slider structure adopted by the present invention has a higher load-bearing capacity and is more adjustable. The guide rail includes a base 1, a fixed guide rail 2, a first sliding guide rail 3, a slider 4, a valve plate 5, a double film feedback throttle 6, a valve seat 7, and a second sliding guide rail 8; the movement form of the guide rail is that the base 1 and the fixed guide rail 2 are fixed parts, and the driving component drives the first sliding guide rail 3, the slider 4 and the second sliding guide rail 8 to move on the fixed guide rail 2; there are two double film feedback throttles 6 on both sides of the valve seat 7, and the two double film feedback throttles 6 deliver lubricating oil of a certain pressure to the guide rail, and can adjust the oil pressure of the oil chamber in the first sliding guide rail 3 and the second sliding guide rail 8 in real time according to the load condition of the guide rail, thereby increasing the stability of the guide rail system. The valve plate 5 is a connecting piece between the slider 4 and the valve seat 7 . The valve plate 5 is fixed to the side of the slider 4 . The valve seat 7 is fixed to the valve plate 5 . The double-film feedback throttle 6 is fixed to the valve seat 7 .

[0051] Furthermore, in this embodiment, the top and the upper half of the outer surface of the first sliding guide rail 3 and the second sliding guide rail 8 are wrapped by the slider 4, forming an outer slider structure and a closed liquid hydrostatic guide rail structure, which further improves the rigidity, adjustability and overall load-bearing capacity of the guide rail compared to the inner slider structure; the closed liquid hydrostatic guide rail structure has better rigidity in the vertical direction, better ability to withstand torque, and better stability and movement accuracy than the open guide rail.

[0052] Further, the film feedback throttle of the present invention, such as Figure 2 As shown, it consists of a valve seat 7 and two double-film feedback throttles 6 (a first double-film feedback throttle and a second double-film feedback throttle), the left end of the valve seat 7 is connected to a double-film feedback throttle 6, and the right end is connected to another double-film feedback throttle 6; each double-film feedback throttle 6 adopts a circular structure, which optimizes the process and is more convenient to process compared with the traditional square structure; an oil inlet hole 71 and a threaded hole 72 are provided on the valve seat 7; the lubricating oil enters the valve seat 7 through the oil inlet hole 71, and then branches and flows into the two double-film feedback throttles, and the valve seat is fixed on the valve plate through the threaded hole 72; the diaphragm feedback throttle designed by the present invention consists of a valve seat and two double-film feedback throttles, and the two double-film feedback throttles can be connected together through the valve seat 7 and uniformly supplied with oil to ensure consistent oil pressure at the throttle inlet.

[0053] Each of the above-mentioned double film feedback throttles 6 is divided into three parts with the first film 61 and the second film 62 as the boundary. Figure 2 The four bolts 63 are connected into a whole, and sealing rings 64 are arranged on the contact surfaces of the three components, and a sealing ring 65 is arranged on the end surface of one of the components, which is used to seal the double-film feedback throttle 6 and the valve seat to prevent oil leakage; an oil inlet hole 66 connected with the oil inlet hole 71 on the valve seat 7 is arranged on the double-film feedback throttle 6; four oil outlet holes 67 are arranged on the side of the double-film feedback throttle, and two symmetrically arranged regulating chambers (regulating chamber A68, regulating chamber B69) are formed on both sides of the first film, and two symmetrically arranged regulating chambers (regulating chamber C610, regulating chamber D611) are formed on both sides of the second film. A connecting oil circuit is arranged inside the double-film feedback throttle, and the lubricating oil entering the oil inlet hole 66 enters the four regulating chambers through the connecting oil circuit and flows out from the four oil outlet holes 67. That is, there are four oil outlet holes 67, two of which are located on the middle component, and the other two are located on the two outer components;

[0054] The lubricating oil flows into the throttle from the oil inlet hole 71 to both sides, and enters the four regulating chambers separated by the first film 61 and the second film 62 through the lower oil path. The throttle uses the throttling gap formed between the film and the left and right cones to throttle, and adjusts the deformation of the film and the size of the throttling gap according to the oil pressure in the oil chamber in real time, thereby controlling the oil pressure in the regulating chamber and the output of the oil outlet hole 67. During the adjustment process, it is necessary to ensure that the guide rail oil chambers corresponding to the adjustment chambers on both sides of each film are in a strict upper and lower position correspondence relationship; for example, the adjustment chamber A68 and the adjustment chamber B69 correspond to the oil chamber B36 and the oil chamber A31 respectively, and the adjustment chamber C610 and the adjustment chamber D611 correspond to the oil chamber B86 and the oil chamber A81 respectively. This design ensures that the adjustment chambers on both sides of each film adjust the pressure of the upper and lower oil chambers at the same guide rail position, thereby ensuring the precise movement and high rigidity of the entire guide rail.

[0055] Specific oil circuit design such as Figure 4 As shown, Figure 4 for Figure 1 A bottom view of the middle slider 4 shows that eight oil passages (four first oil passages 41 and four second oil passages 43 ) are arranged on one side surface of the slider 4 , and each oil passage corresponds to the oil supply of one oil chamber. Figure 4 The two first oil circuits 41 and the two second oil circuits 43 on the left side correspond to the four oil outlet holes 67 of one of the double diaphragm feedback throttles 6, and are connected to each other through a high-pressure oil pipe; the two first oil circuits 41 and the two second oil circuits 43 on the right side correspond to the four oil outlet holes 67 of another of the double diaphragm feedback throttles 6.

[0056] When designing the size of the double-film feedback throttle and the oil circuit position of the slider, it is ensured that each oil outlet hole 67 of the throttle and the oil circuit entrance of the corresponding slider are on the same vertical plane, so as to facilitate the connection of the high-pressure oil pipe; in addition, the eight oil circuits (four first oil circuits 41 and four second oil circuits 43) arranged on the side of the slider are strictly located on the same horizontal plane, ensuring that there is no mutual interference between the oil circuits when conveying high-pressure lubricating oil. The lubricating oil in the four first oil circuits 41 flows out from the oil outlet hole A42 into the first sliding guide rail, and the lubricating oil in the four second oil circuits 43 flows into the four third oil circuits 44 through the high-pressure oil pipe, and finally flows out from the oil outlet hole B45 into the second sliding guide rail. That is, the first sliding guide is supplied with oil by the right two oil circuits of the left double film feedback throttle and the left two oil circuits of the right double film feedback throttle, and the second sliding guide is supplied with oil by the left two oil circuits of the left double film feedback throttle and the right two oil circuits of the right double film feedback throttle, ensuring that both slides are supplied with oil by two double film feedback throttles, and the two double film feedback throttles cross-supply oil to the two slides, rather than one double film feedback throttle corresponding to one slide. The purpose and reason of such design are mainly: to simplify the oil circuit in the slider to the greatest extent, so that the lubricating oil can quickly reach the oil chamber, ensuring the uniform distribution of oil pressure and oil film thickness and the rapid response capability of the film feedback throttle. If the oil supply method of one double film feedback throttle corresponding to one slide is adopted, the length of the four oil circuits will increase, and the number of turns will increase, which will not only increase the difficulty of processing design, but also have an adverse effect on the performance of the guide.

[0057] The second oil circuit 43 and the third oil circuit 44 of the present invention are not connected by drilling holes in the slider, but by hollowing out the middle area of ​​the slider to connect the high-pressure oil pipe to transport the lubricating oil. This can achieve the purpose of reducing the weight of the guide rail, and the weight reduction of the slider can improve the bearing capacity of the guide rail; at the same time, the use of high-pressure oil pipes reduces the travel of the lubricating oil through the metal material, thereby reducing the impurities in the oil film and the friction between the guide rail, thereby ensuring the accuracy of the guide rail movement. The ten threaded holes 46 in the figure are used to connect the slider and the sliding guide rail.

[0058] The first sliding guide rail 3 of the present invention is shown in FIG5 . The side surface of the first sliding guide rail 3 is V-shaped, and four oil chambers are arranged on the V-shaped surface, wherein two oil chambers A31 are located on the upper V-shaped surface, and the other two oil chambers B32 are located on the lower V-shaped surface. An oil outlet hole is arranged on the wall of each oil chamber. Specifically, the two oil chambers A31 on the upper V-shaped surface are provided with oil outlet holes 32; the two oil chambers B32 on the lower V-shaped surface are provided with oil outlet holes 33; and the oil outlet holes 33 and the oil outlet holes 32 are both connected to the oil inlet hole 34. Figure 4The lubricating oil flowing out of the four oil outlet holes A42 flows into the first sliding guide rail 3 through the oil inlet hole 34, and then flows out from the oil outlet hole A32 and the oil outlet hole B33 respectively, forming an upper oil film and a lower oil film between the sliding guide rail and the fixed guide rail to support the movement of the guide rail; the two inner oil outlet holes of the four oil outlet holes A42 correspond to the two oil chambers on the lower V-shaped surface of the sliding guide rail 3, and the two outer oil outlet holes correspond to the two oil chambers on the upper V-shaped surface.

[0059] As shown in FIG6 , the side surface of the second sliding guide rail 8 is V-shaped, and four oil chambers are arranged on the V-shaped surface, of which two oil chambers A81 are located on the upper V-shaped surface, and the other two oil chambers B86 are located on the lower V-shaped surface. An oil outlet hole is arranged on the wall of each oil chamber. Specifically, the two oil chambers A81 on the upper V-shaped surface are provided with oil outlet holes 82; the two oil chambers B86 on the lower V-shaped surface are provided with oil outlet holes 83; and the oil outlet holes 83 and the oil outlet holes 82 are both connected to the oil inlet hole 84; Figure 4 The lubricating oil flowing out of the four oil outlet holes A45 flows into the second sliding guide rail 8 through the oil inlet hole 84, and then flows out from the oil outlet holes 82 and the oil outlet holes 83 respectively, forming an oil film between the second sliding guide rail 8 and the fixed guide rail to support the movement of the guide rail; the two inner oil outlet holes of the four oil outlet holes A45 correspond to the two oil chambers on the upper V-shaped surface of the sliding guide rail 8, and the two outer oil outlet holes correspond to the two oil chambers on the lower V-shaped surface. The second sliding guide rail 8 and the first sliding guide rail 3 together form a double V-shaped oil film between the fixed guide rails to support the movement of the guide rails.

[0060] Furthermore, the above-mentioned oil chamber A81, oil chamber B86, oil chamber A31, and oil chamber B32 do not adopt conventional rectangular oil chambers parallel to the fixed guide rail, but are designed as oil chamber structures similar to triangular prisms. This structure can ensure the bearing capacity, rigidity, and motion accuracy of the guide rail, while optimizing the manufacturing process and making it more convenient to process.

[0061] The double V-shaped hydrostatic guide rail with film feedback throttling proposed by the present invention adopts a double V-shaped structure between the fixed guide rail and the first sliding guide rail and the second sliding guide rail, which has good rigidity in both the vertical and horizontal directions. Compared with the conventional square structure, it can improve its ability to resist overturning and adapt to complex load conditions. The guide rail adopts an outer slider structure, and the slider is optimized to reduce the mass of the slider, further improving the adjustability and overall load-bearing capacity of the guide rail.

[0062] The double V-shaped guide rail in the present invention has an oil chamber at a certain angle to the horizontal plane. Each oil chamber can provide support in the vertical and horizontal directions, and the number is reduced to 8. The oil chamber is the core structure of the liquid hydrostatic guide rail and requires rigorous design and precise processing. Therefore, reducing the number of oil chambers also means reducing the difficulty of designing and manufacturing the guide rail.

[0063] The advantage of the double V-shaped guide rail in the present invention is that each oil chamber can provide support in the vertical and horizontal directions. However, compared with conventional liquid hydrostatic guide rails, the double V-shaped structure will reduce the vertical bearing capacity of the guide rail while providing better anti-overturning ability. The small hole throttle is currently a more common throttling method because of its low manufacturing cost, simple structure and manufacturing process, and good rigidity for the guide rail. Although the film feedback throttle has a high manufacturing cost, it can provide the guide rail with higher rigidity and motion accuracy. Therefore, the present invention abandons the most commonly used small hole throttling form and adopts a combination of film feedback throttling and double V-shaped guide rails. This design makes up for the shortcomings of the double V-shaped guide rail, which can not only optimize the rigidity and bearing capacity of the guide rail, but also provide the guide rail with excellent anti-overturning ability.

[0064] The present invention designs a complete oil circuit, and the lubricating oil passes through the valve seat, the double film feedback throttle, the slider and the sliding guide rail in sequence. At the same time, the lubricating oil of the second sliding guide rail is not delivered by drilling holes in the slider, but by hollowing out the middle part of the slider to connect the high-pressure oil pipe to deliver the lubricating oil. This method reduces the stroke of the lubricating oil flowing through the metal material, thereby reducing the friction between the impurities in the oil film and the guide rail, thereby ensuring the accuracy of the guide rail movement.

[0065] Finally, it should be noted that relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double V-shaped liquid hydrostatic guide rail with film feedback throttling, characterized in that: It includes a base, a fixed guide rail, a first sliding guide rail, a slider, a double-film feedback throttle, a valve seat, and a second sliding guide rail; The fixed guide rail is fixed on the base, and a first sliding guide rail and a second sliding guide rail are respectively arranged on both sides of the fixed guide rail to be slidably connected thereto, and the surfaces where the first sliding guide rail and the second sliding guide rail match the fixed guide rail are V-shaped, and an oil cavity is arranged on the V-shaped matching surfaces of the first sliding guide rail and the second sliding guide rail; The first sliding guide rail and the second sliding guide rail are fixedly connected to the slider, and a valve seat is fixed on the side of the slider, one end of the valve seat is connected to the first double-film feedback throttle, and the other end is connected to the second double-film feedback throttle; an oil inlet hole is provided on the valve seat, and the oil inlet hole supplies oil to the first and second double-film feedback throttles at the same time, and the two oil outlet holes close to the valve seat in the first and second double-film feedback throttles supply oil to the oil cavity of the first sliding guide rail through the first oil circuit on the slider; the two oil outlet holes away from the valve seat in the first and second double-film feedback throttles supply oil to the oil cavity of the second sliding guide rail through the second oil circuit on the slider; the middle part of the slider is a hollow structure, and the second oil circuit includes two sections, one section is located on the side where the first oil circuit is located, and the other section is located on the other opposite side, and the two sections of the oil circuit are connected by a high-pressure oil pipe; Four oil chambers are arranged on the V-shaped surface of the first sliding guide rail, two of which are located on the upper V-shaped surface, and the other two are located on the lower V-shaped surface, and the oil chambers on the upper and lower V-shaped surfaces are symmetrically arranged. Four oil chambers are arranged on the V-shaped surface of the second sliding guide rail, two of which are located on the upper V-shaped surface, and the other two are located on the lower V-shaped surface, and the oil chambers on the upper and lower V-shaped surfaces are symmetrically arranged.

2. The double V-shaped hydrostatic guide rail with film feedback throttling as claimed in claim 1, characterized in that: In the first sliding guide rail and the second sliding guide rail, two oil chambers symmetrical up and down are supplied with oil by the same double-film feedback throttle.

3. The double V-shaped hydrostatic guide rail with film feedback throttling as claimed in claim 1, characterized in that: The oil chamber is in the shape of a triangular prism.

4. The double V-shaped hydrostatic guide rail with film feedback throttling as claimed in claim 1, characterized in that: Each double-diaphragm feedback throttle includes a first membrane and a second membrane. The double-diaphragm feedback throttle is divided into three parts with the first membrane and the second membrane as the boundary, and the three parts are connected into a whole by bolts; an oil inlet hole connected to the oil inlet hole is arranged at one end of the double-diaphragm feedback throttle, and four oil outlet holes are arranged on the side of the double-diaphragm feedback throttle, two symmetrically arranged regulating chambers are formed on both sides of the first membrane, and two symmetrically arranged regulating chambers are formed on both sides of the second membrane, and a connecting oil circuit is arranged inside the double-diaphragm feedback throttle, and the lubricating oil coming in from the oil inlet hole enters the four regulating chambers through the connecting oil circuit and flows out from the four oil outlet holes.

5. The double V-shaped hydrostatic guide rail with film feedback throttling as claimed in claim 4, characterized in that: The two adjustment chambers on both sides of the same film correspond to a group of upper and lower oil chambers of a sliding guide rail.

6. The double V-shaped hydrostatic guide rail with film feedback throttling as claimed in claim 1, characterized in that: Each double membrane feedback throttle is a cylindrical throttle.

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