CN115351595A

CN115351595A - Feedback type throttling device applied to machine tool and machine tool

Info

Publication number: CN115351595A
Application number: CN202211292196.7A
Authority: CN
Inventors: 吕鹤; 姜超; 刘文志; 陈洪; 薛松海; 占稳; 林鸿榕; 黄丰强; 朱亨锋
Original assignee: China National Machinery Institute Group Haixi Fujian Branch Co ltd
Current assignee: China National Machinery Institute Group Haixi Fujian Branch Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2022-11-18
Anticipated expiration: 2042-10-21
Also published as: CN115351595B

Abstract

The application discloses be applied to feedback formula throttling arrangement and lathe of lathe. The feedback type throttling device applied to the machine tool comprises a shell component, a first metal sheet and a second metal sheet. The shell component is surrounded to form a pressure stabilizing cavity, a regulating cavity and an annular throttling groove, and the first metal sheet is arranged in the pressure stabilizing cavity; the second metal sheet is arranged in the annular cavity; the shell assembly is further provided with an oil inlet channel, a communication channel, an oil outlet channel, a communication cavity and the like, the oil inlet channel is communicated with the first throttling section of the annular throttling groove, the communication channel is used for communicating the pressure stabilizing cavity with the second throttling section of the annular throttling groove, the oil outlet channel is communicated with the pressure stabilizing cavity and the second throttling section, the communication cavity is used for communicating the adjusting cavity with the pressure stabilizing cavity, and the communication position of the communication cavity and the pressure stabilizing cavity is located on one side, away from the annular throttling boss, of the first metal sheet. The feedback type throttling device has a compact and simple structure, and can replace a film deformation feedback type throttling device to be applied to a machine tool with high requirements on oil film bearing capacity and rigidity.

Description

Feedback type throttling device applied to machine tool and machine tool

Technical Field

The application relates to the technical field of machining tools, in particular to a feedback type throttling device applied to a machine tool and the machine tool.

Background

The machine tool for processing wood, metal or polyester materials and the like mainly comprises a lathe bed, a guide rail assembly, a rotating shaft assembly, a rotary table assembly, a cutter structure and the like. In the process of actually designing the machine tool, a hydrostatic pressure technology is often adopted to improve the service life and the motion sensitivity of the guide rail assembly, the rotating shaft assembly and the rotating table assembly.

Hydrostatic pressure is a sliding bearing technique that supports a load by means of hydrostatic pressure input between the bearing faces. Compared with the traditional rolling bearing, the hydrostatic bearing has the advantages of long service life, sensitive and stable motion and the like, and simultaneously reduces the influence of manufacturing errors due to the error homogenization of a bearing oil film. The oil film bearing capacity and rigidity are key technical parameters in the hydrostatic pressure technology, and the oil film of the hydrostatic bearing system is mainly controlled by a restrictor, namely, the restrictor for controlling the thickness of the oil film is a core element in the hydrostatic pressure system.

In the prior art, the throttler mainly comprises a capillary, a small hole, a multi-head pump type throttler and a film feedback type throttler. However, the capillary tube and the small-hole type throttler cannot be changed correspondingly with the change of the load, have no feedback effect, and have poor bearing capacity and rigidity; the multi-head pump type throttler is complex to manufacture, long in oil path, large in compression and inertia influence of lubricating oil, and poor in bearing capacity and rigidity; the film deformation feedback type throttler is difficult to design and high in processing and detection precision requirements.

Disclosure of Invention

The main purpose of the application is to provide a feedback type throttling device applied to a machine tool and the machine tool, wherein the throttling device has a feedback effect, is compact and simple in structure, is convenient to design and process, and can be applied to the machine tool with high requirements on oil film bearing capacity and rigidity instead of a film deformation feedback type throttling device.

According to an aspect of an embodiment of the present application, there is provided a feedback type throttling device applied to a machine tool, the feedback type throttling device including:

the device comprises a shell assembly, a pressure stabilizing cavity, an adjusting cavity and an annular throttling groove are formed in the shell assembly in a surrounding mode, an annular throttling boss is arranged in the pressure stabilizing cavity, the adjusting cavity is an annular cavity arranged around the periphery of the pressure stabilizing cavity, the annular throttling groove is an annular groove arranged around the periphery of the adjusting cavity, the annular throttling groove comprises a first throttling section and a second throttling section, the flow area of the first throttling section is larger than that of the second throttling section, and a reserved passage communicated with the adjusting cavity is formed in the side wall of the first throttling section;

the first metal sheet is arranged in the pressure stabilizing cavity and can reciprocate along the direction close to or far away from the annular throttling boss; and

the second metal sheet is an annular metal sheet matched with the annular cavity, and is arranged in the annular cavity and can reciprocate along the height direction of the annular cavity;

the oil outlet passage is communicated with the pressure stabilizing cavity and the second throttling section, the communicating cavity is communicated with the adjusting cavity and the pressure stabilizing cavity, the communicating position of the reserved passage and the adjusting cavity is located on the first side of the second metal sheet, the communicating position of the communicating cavity and the adjusting cavity is located on the second side of the second metal sheet, the communicating position of the communicating cavity and the pressure stabilizing cavity is located on one side, away from the annular throttling boss, of the first metal sheet, and the oil filling port is communicated with the communicating cavity.

Further, the housing assembly comprises a first housing and a second housing which are fitted and fixedly connected with each other, wherein,

a first cavity and a first annular cavity are arranged on the side surface, close to the second shell, of the first shell, the first annular cavity is arranged around the periphery of the first cavity, and the annular throttling boss is arranged in the first cavity;

the side face, close to the first shell, of the second shell is provided with a second cavity and a second annular cavity, the second annular cavity surrounds the periphery of the second cavity, the first cavity and the second cavity are arranged in a surrounding mode to form the pressure stabilizing cavity, and the first annular cavity and the second annular cavity are arranged in a surrounding mode to form the adjusting cavity.

Further, the annular throttle groove is arranged on the side surface of the first shell close to the second shell; alternatively, the first and second electrodes may be,

the annular throttling groove is arranged on the side surface of the second shell close to the first shell.

Further, the oil inlet channel the communicating channel and the oil outlet channel are arranged on the first shell, and the communicating cavity and the oil filling opening are arranged on the second shell.

Further, the reserve channel is a reserve groove provided on the first housing and/or the second housing.

Furthermore, one side of the first shell, which is close to the second shell, is provided with an annular limiting bulge, and the annular limiting bulge is embedded in the second annular cavity.

Further, the periphery of first sheetmetal with the second sheetmetal all overlaps and is equipped with the sealing washer.

Further, a plugging piece is arranged at the oil injection port.

Further, the plugging piece is a jackscrew or a sealant.

On the other hand, the embodiment of the application also discloses a machine tool, wherein the machine tool is a milling machine tool or a grinding and polishing machine tool, and the machine tool comprises the feedback throttling device.

Compared with the prior art, the technical scheme of the application has at least the following technical effects:

the feedback throttling device integrally comprises a shell component, a first metal sheet and a second metal sheet, various flow channels are formed on the shell component through processing, and the first metal sheet and the second metal sheet are matched, so that the feedback throttling device which can replace a thin film deformation feedback throttling device can be applied to a machine tool with high requirements on oil film bearing capacity and rigidity, and the feedback throttling device is compact and simple in structure and convenient to design and process.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is an exploded view of a feedback throttle device disclosed in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first housing of a feedback throttling device according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of the area N in FIG. 2;

FIG. 4 is a schematic structural diagram of a feedback throttling device according to an embodiment of the present disclosure;

FIG. 5 isbase:Sub>A sectional view taken along line A-A of FIG. 4;

FIG. 6 is an enlarged view of region M of FIG. 5;

FIG. 7 is a sectional view taken along line B-B of FIG. 4;

fig. 8 is a schematic diagram of an operation of a feedback-type throttling device disclosed in an embodiment of the present application.

Wherein the figures include the following reference numerals:

10. a housing assembly; 11. a first housing; 111. a first cavity; 112. a first annular cavity; 113. an annular limiting bulge; 12. a second housing; 121. a second cavity; 122. a second annular cavity; 101. a voltage stabilizing cavity; 1011. an annular throttling boss; 102. an adjustment chamber; 103. an annular throttling groove; 1031. a first throttle section; 1032. a second throttle section; 104. reserving a channel; 105. an oil inlet channel; 106. an oil outlet channel; 107. an oil filling port; 108. a communicating cavity; 109. a communication channel; 20. a first metal sheet; 30. a second metal sheet; 40. a seal ring; 50. a first seal member; 60. a second seal member; 70. and (5) jacking the screw.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to fig. 1 to 4, according to an embodiment of the present application, a feedback type throttling device applied to a machine tool is provided, and the feedback type throttling device is particularly suitable for machine tools such as a milling machine tool and a grinding and polishing machine tool.

The feedback type throttling device in the present embodiment includes a housing assembly 10, a first metal sheet 20, and a second metal sheet 30.

As shown in fig. 1, 2, and 4 to 7, the housing assembly 10 in this embodiment encloses a pressure stabilizing cavity 101, a regulating cavity 102, and a ring-shaped throttling groove 103. The annular throttling boss 1011 is arranged in the pressure stabilizing cavity 101, the adjusting cavity 102 is an annular cavity arranged around the periphery of the pressure stabilizing cavity 101, the annular throttling groove 103 is an annular groove arranged around the periphery of the adjusting cavity 102, the annular throttling groove 103 comprises a first throttling section 1031 and a second throttling section 1032, the flow area of the first throttling section 1031 (the area of the longitudinal section of the first throttling section 1031) is larger than that of the second throttling section 1032 (the area of the longitudinal section of the second throttling section 1032), that is, the throttling effect of the second throttling section 1032 is larger than that of the first throttling section 1031, and the reserved passage 104 communicated with the adjusting cavity 102 is arranged on the side wall of the first throttling section 1031, so that oil liquid in the first throttling section 1031 can be conveniently conveyed into the adjusting cavity 102.

Referring to fig. 1, 2, and 5 to 7, the housing assembly 10 in the present embodiment includes a first housing 11 and a second housing 12 attached to each other and fixedly connected together.

Specifically, the first housing 11 and the second housing 12 may be fixedly connected together by bolts, or may be fixedly connected together by snapping or welding, etc. A first cavity 111 and a first annular cavity 112 are arranged on the side surface of the first shell 11 close to the second shell 12, the first annular cavity 112 is arranged around the periphery of the first cavity 111, and the annular throttling boss 1011 is arranged in the first cavity 111; the side surface of the second shell 12 close to the first shell 11 is provided with a second cavity 121 and a second annular cavity 122, the second annular cavity 122 is arranged around the periphery of the second cavity 121, when the first shell 11 and the second shell 12 are assembled together, the first cavity 111 and the second cavity 121 are enclosed to form a pressure stabilizing cavity 101, and the first annular cavity 112 and the second annular cavity 122 are enclosed to form an adjusting cavity 102.

That is, in the present embodiment, by providing the housing assembly 10 as the first housing 11 and the second housing 12 and machining the first cavity 111, the first annular cavity 112, the second cavity 121, and the second annular cavity 122 on the sides of the first housing 11 and the second housing 12 that are close to each other, the surge chamber 101 and the adjustment chamber 102 can be enclosed and formed after the first housing 11 and the second housing 12 are assembled together, the structure is simple, and machining and assembling are facilitated.

Of course, in other embodiments of the present application, the housing assembly 10 may also include three or more housings as long as the surge chamber 101 and the adjustment chamber 102 can be enclosed.

In this embodiment, the pressure stabilizing cavity 101 is a cylindrical cavity, and the adjusting cavity 102 is a circular ring cavity, but of course, in other embodiments of the present application, the pressure stabilizing cavity 101 may be set as a prism or other special-shaped cavity, and the adjusting cavity 102 may be set as a prism ring or other special-shaped ring cavity, as long as other deformation modes under the concept of the present application are within the protection scope of the present application.

Alternatively, the annular throttle groove 103 may be provided on the side of the first housing 11 close to the second housing 12, or may be provided on the side of the second housing 12 close to the first housing 11; the reserve channel 104 is a reserve groove provided on the first housing 11 and/or the second housing 12, and has a simple structure and is more convenient to process. For example, the annular throttling groove 103 in this embodiment is an annular throttling groove, and the first throttling section 1031 and the second throttling section 1032 on the annular throttling groove 103 are both semicircular annular throttling sections, which may be specifically selected and designed according to actual throttling requirements, and are not specifically limited in this application.

In order to prevent the oil from streaming, a first sealing element 50 and a second sealing element 60 are arranged between the first shell 11 and the second shell 12, wherein the first sealing element 50 is positioned on the periphery of the annular throttling groove 103 to prevent the oil in the annular throttling groove 103 from streaming to the outside of the housing assembly 10, the second sealing element 60 is positioned between the first cavity 111 and the first annular cavity 112 to prevent the oil from streaming between the surge chamber 101 and the regulating chamber 102, and the annular throttling groove 103 and the regulating chamber 102 are sealed by surfaces. Optionally, the first sealing element 50 and the second sealing element 60 in this embodiment are both sealing rings.

Furthermore, one side of the first housing 11 close to the second housing 12 is provided with an annular limiting protrusion 113, the annular limiting protrusion 113 is located between the annular throttling groove 103 and the first annular cavity 112, and in the actual assembling process, the annular limiting protrusion 113 is embedded in the second annular cavity 122, so that the relative position between the first housing 11 and the second housing 12 can be limited, and the assembling efficiency of the first housing 11 and the second housing 12 can be improved.

Referring again to fig. 1, 2, 4 to 7, the first metal sheet 20 in this embodiment is disposed in the plenum 101 and can reciprocate in a direction approaching or departing from the ring-shaped throttling boss 1011; the second metal sheet 30 is an annular metal sheet adapted to the annular cavity, the second metal sheet 30 is disposed in the annular cavity and can reciprocate along the height direction of the annular cavity (the direction consistent with the height direction of the annular throttling boss 1011), and the communication position of the reserved passage 104 and the adjusting cavity 102 is located on the first side of the second metal sheet 30.

Preferably, the outer peripheries of the first metal sheet 20 and the second metal sheet 30 are both sleeved with a sealing ring 40, and through the action of the sealing ring 40, the oil in the chambers on both sides of the first metal sheet 20 and the second metal sheet 30 can be prevented from streaming mutually. The first metal sheet 20 and the second metal sheet 30 are each a copper sheet or an aluminum sheet. When the feedback type throttling device works, the first metal sheet 20 and the second metal sheet 30 can respectively reciprocate between the pressure stabilizing cavity 101 and the adjusting cavity 102 to realize the throttling effect, and can replace a film deformation feedback type throttling device to be applied to a machine tool with higher requirements on oil film bearing capacity and rigidity.

Further, the housing assembly 10 is provided with an oil inlet passage 105, a communication passage 109, an oil outlet passage 106, a communication chamber 108, and an oil filling port 107. The oil inlet passage 105 is communicated with the first throttling section 1031, the communicating passage 109 is used for communicating the pressure stabilizing cavity 101 with the second throttling section 1032, the oil outlet passage 106 is communicated with the pressure stabilizing cavity 101 and the second throttling section 1032, the communicating cavity 108 is used for communicating the adjusting cavity 102 with the pressure stabilizing cavity 101, the communicating position of the communicating cavity 108 and the adjusting cavity 102 is located on the second side of the second metal sheet 30, the communicating position of the communicating cavity 108 and the pressure stabilizing cavity 101 is located on one side, away from the annular throttling boss 1011, of the first metal sheet 20, and the oil injection port 107 is communicated with the communicating cavity 108. During practical machining, the oil inlet channel 105, the communication channel 109 and the oil outlet channel 106 are arranged on the first shell 11, and the communication cavity 108 and the oil injection port 107 are arranged on the second shell 12, so that the space on the shell assembly 10 can be reasonably utilized, and the machining and design difficulty of the feedback type throttling device can be simplified.

In the actual machining of the communication passage 109, a pilot hole is formed in the edge of the first housing 11, and a structure such as a jack screw 70 is provided in the pilot hole in order to prevent oil from leaking.

Before use, a fixed volume of non-pressurized hydraulic oil is injected into the communicating chamber 108 through the oil injection port 107, after the oil injection is completed, the first metal piece 20 and the second metal piece 30 are ensured to be at the middle position of the movement stroke, and then the oil injection port 107 is sealed. For sealing the oil filling opening 107, a closure element (not shown) is provided at the oil filling opening 107, which closure element can be, for example, a screw or a sealant.

Referring to fig. 1 to 8, in operation, after hydraulic oil with pressure Ps enters the feedback type throttling device from the oil inlet passage 105, the oil first enters the first throttling section 1031, a part of the oil entering the first throttling section 1031 enters the adjusting chamber 102 through the reserved passage 104 on the first housing 11, the other part of the oil continues to be divided into two parts after entering the second throttling section 1032, one part of the oil enters the pressure stabilizing chamber 101 through the communicating passage 109, and then flows into the static pressure chamber on the machine tool through the annular throttling boss 1011 and the oil outlet passage 106, and the other part of the oil in the second throttling section 1032 intersects with the oil throttled by the annular throttling boss 1011 and simultaneously enters the static pressure chamber on the machine tool.

In the working process, under the combined action of the pressure Ps1 of the regulating cavity 102, the pressure Ps2 of the pressure stabilizing cavity 101, the pressure Pr of the oil outlet channel 106 and the communication cavity 108, the first metal sheet 20 and the second metal sheet 30 can move in the corresponding cavities. Specifically, when the external load is increased, the pressure of the static pressure cavity is high, that is, pr is increased, the balance in the feedback type throttling device is broken, the relative positions of the first metal sheet 20 and the second metal sheet 30 are changed, the throttling gap between the annular throttling boss 1011 and the first metal sheet 20 is increased, the liquid resistance is reduced, the flow entering the oil outlet channel 106 through the gap is increased, the change of the external load is adapted, the thickness of an oil film of the static pressure cavity on a machine tool can be approximately maintained unchanged, and the film deformation feedback type throttling device can be applied to the machine tool with high requirements on the oil film bearing capacity and rigidity instead of a film deformation feedback type throttling device.

On the other hand, the embodiment of the application also discloses a machine tool, and the machine tool can be a milling machine tool or a grinding and polishing machine tool and the like. The machine tool comprises the feedback throttling device in the above embodiment, so that the machine tool comprises all the technical effects of the feedback throttling device in the above embodiment, and since the technical effects of the feedback throttling device have been described in detail in the foregoing, the details are not described here.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, so that the scope of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A feedback-type throttling device for a machine tool, the feedback-type throttling device comprising:

the device comprises a shell assembly (10), wherein the shell assembly (10) is surrounded to form a pressure stabilizing cavity (101), an adjusting cavity (102) and an annular throttling groove (103), an annular throttling boss (1011) is arranged in the pressure stabilizing cavity (101), the adjusting cavity (102) is an annular cavity arranged around the periphery of the pressure stabilizing cavity (101), the annular throttling groove (103) is an annular groove arranged around the periphery of the adjusting cavity (102), the annular throttling groove (103) comprises a first throttling section (1031) and a second throttling section (1032), the flow area of the first throttling section (1031) is larger than that of the second throttling section (1032), and a reserved passage (104) communicated with the adjusting cavity (102) is arranged on the side wall of the first throttling section (1031);

the first metal sheet (20) is arranged in the pressure stabilizing cavity (101) and can reciprocate in a direction close to or far away from the annular throttling boss (1011); and

the second metal sheet (30) is an annular metal sheet matched with the annular cavity, and the second metal sheet (30) is arranged in the annular cavity and can reciprocate along the height direction of the annular cavity;

the oil inlet passage (105), the communication passage (109), the oil outlet passage (106), the communication cavity (108) and the oil filling port (107) are arranged on the housing assembly (10), the oil inlet passage (105) is communicated with the first throttling section (1031), the communication passage (109) is used for communicating the pressure stabilizing cavity (101) with the second throttling section (1032), the oil outlet passage (106) is communicated with the pressure stabilizing cavity (101) and the second throttling section (1032), the communication cavity (108) is used for communicating the adjusting cavity (102) with the pressure stabilizing cavity (101), the communication position of the reserved passage (104) and the adjusting cavity (102) is located on the first side of the second metal sheet (30), the communication position of the communication cavity (108) and the adjusting cavity (102) is located on the second side of the second metal sheet (30), the communication position of the communication cavity (108) and the pressure stabilizing cavity (101) is located on the side, far away from the first metal sheet (20), and the boss (1011) is communicated with the oil filling port (107).

2. A feedback throttling arrangement according to claim 1, wherein the housing assembly (10) comprises a first housing (11) and a second housing (12) engaging each other and fixedly connected together,

a first cavity (111) and a first annular cavity (112) are arranged on the side surface, close to the second shell (12), of the first shell (11), the first annular cavity (112) is arranged around the periphery of the first cavity (111), and the annular throttling boss (1011) is arranged in the first cavity (111);

a second cavity (121) and a second annular cavity (122) are arranged on the side face, close to the first shell (11), of the second shell (12), the second annular cavity (122) is arranged around the periphery of the second cavity (121), the first cavity (111) and the second cavity (121) are arranged in a surrounding mode to form the pressure stabilizing cavity (101), and the first annular cavity (112) and the second annular cavity (122) are arranged in a surrounding mode to form the adjusting cavity (102).

3. The feedback throttle device of claim 2, characterized in that the annular throttle groove (103) is provided on the side of the first housing (11) close to the second housing (12); alternatively, the first and second electrodes may be,

the annular throttling groove (103) is arranged on the side surface of the second shell (12) close to the first shell (11).

4. The feedback type throttling device according to claim 2, wherein the oil inlet passage (105), the communication passage (109) and the oil outlet passage (106) are all disposed on the first housing (11), and the communication chamber (108) and the oil filling port (107) are all disposed on the second housing (12).

5. The feedback throttle device of claim 2, characterized in that the reserve channel (104) is a reserve groove provided on the first housing (11) and/or the second housing (12).

6. The feedback-type throttling device of claim 2, wherein an annular limiting protrusion (113) is disposed on one side of the first housing (11) close to the second housing (12), and the annular limiting protrusion (113) is embedded in the second annular cavity (122).

7. The feedback throttle device according to any one of claims 1 to 6, characterized in that the outer peripheries of the first and second metal sheets (20, 30) are each sheathed with a sealing ring (40).

8. The feedback throttle device of any one of claims 1 to 6, characterized in that a block is provided at the oil filling port (107).

9. The feedback flow restriction of claim 8, wherein the closure member is a jackscrew or a sealant.

10. A machine tool which is a milling machine or a polishing machine, characterized in that it comprises a feedback throttling device according to any one of claims 1 to 9.