阅读说明：本技术 一种超精密圆柱形静压数控机床导轨副 (Guide rail pair of ultra-precise cylindrical static pressure numerical control machine tool ) 是由 吴行飞 吕桂芳 邓崛华 邓光亚 于 2021-09-22 设计创作，主要内容包括：本申请涉及一种超精密圆柱形静压数控机床导轨副,涉及导轨机构,包括轨道和滑动座；所述滑动座上开设有连接孔,所述轨道穿过所述连接孔,且所述轨道与所述滑动座之间设有滑动间隙；所述滑动座的所述连接孔内壁上设有载油腔；所述载油腔围绕所述连接孔的轴线布设；所述滑动座上开设有使所述载油腔与外部油源连通的进油通道；所述滑动座的两端处均设有风幕件,风幕件用于在滑动间隙处形成风幕,风幕用于对通过滑动间隙外溢的油液进行阻挡。本申请具有可以提高机床上静压导轨油液密封性,并通过在滑动座上设置油压补偿机构使机床上使用静压导轨的各个部件在使用的过程中更为稳定的优点。(The application relates to a guide rail pair of an ultra-precise cylindrical hydrostatic numerical control machine tool, which relates to a guide rail mechanism and comprises a rail and a sliding seat; the sliding seat is provided with a connecting hole, the rail penetrates through the connecting hole, and a sliding gap is formed between the rail and the sliding seat; an oil carrying cavity is arranged on the inner wall of the connecting hole of the sliding seat; the oil carrying cavity is distributed around the axis of the connecting hole; an oil inlet channel for communicating the oil carrying cavity with an external oil source is formed in the sliding seat; the both ends department of sliding seat all is equipped with air curtain spare, and air curtain spare is used for forming the air curtain in sliding gap department, and the air curtain is used for blockking through the excessive fluid of sliding gap. This application has and can improve hydrostatic guideway fluid leakproofness on the lathe to through set up oil pressure compensation mechanism on the sliding seat and make each part that uses hydrostatic guideway on the lathe in the more stable advantage of in-process of using.)

1. The utility model provides an ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair which characterized in that: comprises a track (1) and a sliding seat (2);

a connecting hole (21) is formed in the sliding seat (2), the track (1) penetrates through the connecting hole (21), and a sliding gap (3) is formed between the track (1) and the sliding seat (2);

a plurality of oil carrying cavities (22) are arranged on the inner wall of the connecting hole (21) of the sliding seat (2); a plurality of oil carrying cavities (22) are distributed around the axis of the connecting hole (21);

an oil inlet channel (23) which enables the oil carrying cavity (22) to be communicated with an external oil source is formed in the sliding seat (2);

both ends department of sliding seat (2) all is equipped with air curtain spare (4), and air curtain spare (4) are used for forming the air curtain in sliding gap (3) department, and the air curtain is used for blockking through the excessive fluid of sliding gap (3).

2. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 1, wherein: the air curtain piece (4) is of an annular structure;

the air curtain piece (4) is sleeved on the track (1), a ventilation gap (45) is formed between the air curtain piece (4) and the track (1), and the air curtain piece (4) is installed on the sliding seat (2);

and the air curtain piece (4) is provided with an air guide channel (41) communicated with the ventilation gap (45), and the air guide channel (41) is communicated with an external air source.

3. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 2, wherein: the air guide channel (41) comprises a main channel (411), a flow dividing cavity (412) and a plurality of branch channels (413);

the branch cavity (412) is an annular cavity which is arranged inside the air curtain piece (4) and surrounds the track (1);

the main channel (411) is used for communicating the shunting cavity (412) with an external high-pressure air source; a plurality of the branch passages (413) are located between the branch chamber (412) and the ventilation gap (45), and the branch passages (413) communicate the branch chamber (412) with the ventilation gap (45).

4. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 3, wherein: an annular collecting groove (44) is formed in the air curtain piece (4), and the collecting groove (44) is arranged around the track (1); the plurality of branch passages (413) are all communicated with the collecting groove (44).

5. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 4, wherein: the opening of the collecting groove (44) is inclined towards one side of the sliding seat (2).

6. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 1, wherein: two annular oil return cavities (26) are formed in the inner wall of the connecting hole (21) of the sliding seat (2), and the oil return cavities (26) are distributed around the track (1);

the oil carrying cavity (22) is positioned between the two oil return cavities (26);

be equipped with two oil return passageways (27) on sliding seat (2), two oil return passageways (27) respectively with two oil return chamber (26) one-to-one and intercommunication, oil return passageway (27) are used for with the leading-in outside collection container of fluid in oil return chamber (26).

7. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 2, wherein: one side of the air curtain piece (4) facing the sliding seat (2) is integrally provided with a threaded pipe (43), and the threaded pipe (43) is coaxial with the connecting hole (21);

a threaded hole (25) matched with the threaded pipe (43) is formed in the sliding seat (2) at the end of the corresponding connecting hole (21), and the threaded pipe (43) is in threaded connection with the sliding seat (2) through the threaded hole (25); and a gap is arranged between the threaded pipe (43) and the track (1).

8. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 6, wherein: a plurality of oil carrying cavities (22) are arranged, and pressure monitors (221) are arranged in the oil carrying cavities (22); a plurality of groups of pressure compensation channels (28) are arranged on the sliding seat (2), and each group of pressure compensation channels (28) comprises a plurality of pressure compensation channels (28);

the pressure compensation channels (28) in the same group are communicated with an external air source, and the pressure compensation channels (28) in the same group are respectively in one-to-one correspondence with the oil carrying cavities (22);

when the load on the sliding seat (2) is uneven, the pressure monitor (221) in the oil carrying cavity (22) senses the pressure change of oil and transmits the pressure change to the control center, the control center controls the external air source to send high-pressure air into the corresponding pressure compensation channel (28), and the high-pressure air blows to the track (1) to carry out pressure compensation on the oil pressure in the oil carrying cavity (22).

9. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 8, wherein: the pressure compensation channels (28) are arranged in two groups, and the oil carrying cavity (22) is located between the two groups of pressure compensation channels (28).

10. The ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair according to claim 9, wherein: and the two groups of pressure compensation channels (28) are positioned between the two oil return cavities (26), and when the pressure compensation channels (28) do not need to perform pressure compensation on the oil pressure in the oil carrying cavity (22), gas is continuously introduced into the pressure compensation channels (28).

Technical Field

The application relates to a guide rail mechanism, in particular to a guide rail pair of an ultra-precise cylindrical hydrostatic numerical control machine.

Background

The ultra-precise cylindrical hydrostatic guideway pair is a necessary track mechanism on some numerical control machines, and the hydrostatic guideway pair is a feed motion guideway and a low-speed motion guideway on the machine tool.

Referring to fig. 1 and 2, the guide rail pair of the ultra-precise cylindrical hydrostatic numerical control machine tool in the related art comprises a track 1 with a circular cross section and a sliding seat 2. The sliding seat 2 is provided with a connecting hole 21 with a circular section, the track 1 penetrates through the connecting hole 21, a sliding gap 3 is arranged in front of the track 1 and the sliding seat 2, and the sliding gap 3 between the track 1 and the sliding seat 2 is generally not more than 0.04 mm. An oil carrying cavity 22 with a circular section is formed in a connecting hole 21 on the sliding seat 2, and the diameter of the oil carrying cavity 22 is larger than that of the connecting hole 21. Oil return cavities 26 are coaxially formed in the sliding seats 2 at the two ends of the oil bearing cavity 22.

An oil inlet channel 23 is arranged between the peripheral surface of the sliding seat 2 and the oil carrying cavity 22, and an oil pipe 24 communicated with the oil inlet channel 23 is fixedly connected to the surface of the sliding seat 2. Two oil return channels 27 are further formed in the outer peripheral surface of the sliding seat 2, and the two oil return channels 27 correspond to the two oil return cavities 26 one by one respectively; two oil return pipes 24 are fixedly connected to the outer surface of the sliding seat 2, and the two oil return pipes 24 are respectively communicated with the two oil return channels 27 in a one-to-one correspondence manner.

Oil can be injected into the oil carrying cavity 22 through the oil pipe 24 and the oil return passage 27, so that the oil carrying cavity 22 is coaxial with the connecting hole 21, and a layer of oil cushion is formed between the sliding seat 2 and the track 1, so that the resistance of the sliding seat 2 in sliding on the track 1 is reduced, and meanwhile, the oil at two ends of the oil carrying cavity 22 enters the oil return cavity 26 through a gap between the sliding seat 2 and the track 1 and is collected through the oil return passage 27.

In view of the above-mentioned related technologies, the inventor found that in actual use, due to the gap between the rail 1 and the sliding seat 2, the oil overflowing from the oil carrying chamber 22 often passes through the oil returning chamber 26 and then overflows from both ends of the sliding seat 2.

Disclosure of Invention

In order to improve the not good problem of hydrostatic guideway device fluid leakproofness on the lathe among the correlation technique, this application provides a cylindrical hydrostatic numerical control machine tool guide rail of ultraprecision pair.

The application provides a pair of cylindrical hydrostatic numerical control machine tool guide rail of ultraprecision adopts following technical scheme:

an ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair comprises a rail and a sliding seat;

the sliding seat is provided with a connecting hole, the rail penetrates through the connecting hole, and a sliding gap is formed between the rail and the sliding seat;

an oil carrying cavity is arranged on the inner wall of the connecting hole of the sliding seat; the oil carrying cavity is distributed around the axis of the connecting hole;

an oil inlet channel for communicating the oil carrying cavity with an external oil source is formed in the sliding seat;

the both ends department of sliding seat all is equipped with air curtain spare, and air curtain spare is used for forming the air curtain in the clearance department between sliding seat and track, and the air curtain is used for blockking through the excessive fluid of sliding gap.

Through adopting above-mentioned technical scheme, the both ends of sliding seat all set up air curtain spare, and air curtain spare forms the air curtain in the clearance department of sliding seat tip, and the air curtain can block the sliding gap of sliding seat tip, and the condition that reduces fluid as far as and pass through the sliding gap overflow takes place, reduces the fluid loss of lathe in the use.

Optionally, the air curtain member is of an annular structure;

the air curtain piece is sleeved on the rail, a ventilation gap is formed between the air curtain piece and the rail, and the air curtain piece is installed on the sliding seat;

and the air curtain piece is provided with an air guide channel communicated with the ventilation gap, and the air guide channel is communicated with an external air source.

By adopting the technical scheme, the external high-pressure air source can send the air flow into the ventilation gap through the air guide channel and diffuse in the ventilation gap, so that the air flow is diffused to the whole ventilation gap, the number of the external high-pressure air sources can be reduced as much as possible, and the energy is saved.

Optionally, the air guide channel includes a main channel, a diversion cavity, and a plurality of branch channels;

the flow dividing cavity is an annular cavity which is arranged inside the air curtain piece and is arranged around the track;

the main channel is used for communicating the shunting cavity with an external high-pressure air source; the plurality of branch passages are located between the branch chamber and the ventilation gap, and the branch passages communicate the branch chamber with the ventilation gap.

By adopting the technical scheme, the air guide channel has a shunting effect, so that the air flow sent into the ventilation gap by the high-pressure air source is more uniform.

Optionally, an annular collecting groove is formed in the air curtain piece, and the collecting groove is arranged around the rail; a plurality of said branch channels are all in communication with said header tank.

Through adopting above-mentioned technical scheme, the air current that high pressurized air source blew to the ventilation clearance can be to the mass flow groove diffusion after entering into the mass flow groove, and the messenger that can further like this blows to the air current in ventilation clearance more even.

Optionally, the opening of the collecting groove is inclined toward one side of the sliding seat.

Through adopting above-mentioned technical scheme, after the branch passageway case collecting tank blew out the air current, can blow to the sliding gap under the guiding action of collecting tank, can make the air curtain that the air current formed in the sliding gap like this better to the effect that blocks of fluid.

Optionally, two annular oil return cavities are formed in the inner wall of the connecting hole in the sliding seat, and the oil return cavities are distributed around the rail;

the oil carrying cavity is positioned between the two oil return cavities;

the sliding seat is provided with two oil return channels, the two oil return channels are respectively in one-to-one correspondence with the oil return cavities and communicated with the oil return cavities, and the oil return channels are used for guiding oil in the oil return cavities into an external collection container.

Through adopting above-mentioned technical scheme, the fluid that the carrier oil chamber is excessive through the sliding gap can be collected through oil return chamber at first, and oil return chamber cooperation air curtain spare can make the excessive condition of fluid be further improved between sliding seat and the track at the air curtain that the sliding seat tip formed like this.

Optionally, a threaded pipe is integrally arranged on one side of the air curtain piece facing the sliding seat, and the threaded pipe is coaxial with the connecting hole;

a threaded hole matched with the threaded pipe is formed in the sliding seat at the end of the corresponding connecting hole, and the threaded pipe is in threaded connection with the sliding seat through the threaded hole; and a gap is arranged between the threaded pipe and the track.

Through adopting above-mentioned technical scheme, realized dismantling between air curtain spare and the sliding seat and be connected, be convenient for to the category production of air curtain spare and sliding seat, it is also more convenient when air curtain spare and sliding seat transport simultaneously. Meanwhile, the air curtain piece is connected with the sliding seat through the threads, so that the air curtain piece and the sliding seat are better in sealing performance.

Optionally, a plurality of oil carrying cavities are provided, and a pressure monitor is arranged in each oil carrying cavity; a plurality of groups of pressure compensation channels are arranged on the sliding seat, and each group of pressure compensation channels comprises a plurality of pressure compensation channels;

the pressure compensation channels in the same group are communicated with an external air source, and the pressure compensation channels in the same group are respectively in one-to-one correspondence with the oil carrying cavities;

when the load is uneven on the sliding seat, the pressure monitor in the oil carrying cavity senses the pressure change of oil and transmits the pressure change to the control center, the control center controls the external air source to send high-pressure air into the corresponding pressure compensation channel, and the high-pressure air blows to the track to perform pressure compensation on the oil pressure in the oil carrying cavity.

Through adopting above-mentioned technical scheme, when load is uneven on the sliding seat, carry the oil intracavity the pressure monitor senses the pressure variation of fluid to transmit to control center, control center control outside air supply to corresponding send into high-pressure gas in the pressure compensation passageway, high-pressure gas blows to the track, carries out pressure compensation to the oil pressure of carrying the oil intracavity. Therefore, the hydrostatic guide rail used on the machine tool is more stable in the working process, and the machine tool is more stable in the using process.

Optionally, the pressure compensation channels are provided in two groups, and the two groups of pressure compensation channels are respectively arranged at two ends of the oil carrying cavity.

Through adopting above-mentioned technical scheme, two sets of pressure compensation passageways can carry out pressure compensation to the carrier oil chamber from the both ends department in carrier oil chamber for the further improvement of stability of sliding seat.

Optionally, the two sets of pressure compensation channels are located between the two oil return cavities, and when the pressure compensation channels do not need to perform pressure compensation on oil pressure in the oil carrying cavity, gas is continuously introduced into the pressure compensation channels.

Through adopting above-mentioned technical scheme, when pressure compensation need not carry out pressure compensation at the pressure compensation passageway like this, continuously let in a small amount of gas in the pressure compensation passageway, can increase the leakproofness of sliding gap, can also avoid the fluid in the sliding gap to enter into the sliding gap as far as simultaneously, further, reduced the lathe at the fluid loss on the hydrostatic guideway of during operation, reduced the loss of fluid for the lathe is higher to the rate of utilization of fluid.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the air curtain pieces are arranged at the two ends of the sliding seat, so that the air curtain pieces can be used for manufacturing air curtains for blocking oil in the oil sliding gaps at the ends of the sliding seat, the oil overflow in the sliding gaps can be reduced as much as possible by the air curtains, the oil loss of a machine tool on a hydrostatic guide rail during working is reduced, the oil loss is reduced, and the utilization rate of the machine tool on the oil is higher;

2. the air curtain piece is provided with the air inlet channel and the flow collecting groove for flow distribution, so that the oil liquid in the sliding gap can be better blocked by the air flow blown out by the air curtain piece;

3. the oil return cavity is arranged in the sliding seat, so that the condition of oil overflow is further improved. In addition, the pressure compensation channel is arranged in the sliding seat, so that the oil pressure in the oil carrying cavity can be compensated under the condition of uneven load of the sliding seat, and the stability of the sliding seat is improved.

Drawings

Fig. 1 is a schematic view of the configuration of a hydrostatic guideway in the related art.

Fig. 2 is a sectional view of a hydrostatic guideway in the related art.

Fig. 3 is a schematic structural diagram of the outer shape of the hydrostatic guideway in the embodiment of the present application.

FIG. 4 is a schematic view showing a structure of arranging the relief oil chamber on the slide seat in the embodiment of the present application.

FIG. 5 is a schematic view of the embodiment of the present application highlighting the mating configuration of the sliding seat and the air curtain member.

Fig. 6 is a partially enlarged schematic view of a portion a in fig. 5.

Description of reference numerals: 1. a track; 2. a sliding seat; 21. connecting holes; 22. an oil carrying cavity; 221. a pressure monitor; 23. an oil inlet channel; 231. a first channel; 232. a second channel; 233. a third channel; 24. an oil pipe; 25. a threaded hole; 26. an oil return cavity; 27. an oil return passage; 28. a pressure compensation channel; 29. a gas injection pipe; 3. a sliding gap; 4. an air curtain member; 41. an air guide channel; 411. a main channel; 412. a shunting cavity; 413. a branch channel; 42. an air duct; 43. a threaded pipe; 44. a collecting groove; 45. a ventilation gap.

Detailed Description

The present application is described in further detail below with reference to figures 3-6.

The embodiment of the application discloses an ultra-precise cylindrical hydrostatic numerical control machine tool guide rail pair. Referring to fig. 3, the rail device includes a rail 1 and a sliding seat 2, and the rail 1 is a rod-shaped structure having a circular cross section. The sliding seat 2 is provided with a connecting hole 21, the rail 1 passes through the connecting hole 21, and a sliding gap 3 is arranged between the rail 1 and the sliding seat 2. The sliding clearance 3 is typically less than 0.04 mm.

Referring to fig. 4, a plurality of oil loading cavities 22 are formed in the connecting hole 21 of the sliding seat 2, and one surface of each oil loading cavity 22 facing the axis of the connecting hole 21 is an arc-shaped surface. The plurality of oil-carrying chambers 22 are uniformly arranged around the axis of the connecting hole 21.

An oil inlet passage 23 is provided between the outer peripheral surface of the slide holder 2 and the plurality of oil-carrying chambers 22. An oil pipe 24 communicated with the oil inlet channel 23 is fixedly connected to the surface of the sliding seat 2, and the oil pipe 24 is communicated with an external constant pressure oil pump. The constant pressure oil pump can inject oil into the plurality of oil-carrying chambers 22 through the oil pipe 24 and the oil inlet passage 23, and make the oil in the plurality of oil-carrying chambers 22 have a certain pressure.

The oil-intake passage 23 may be an oil hole that communicates with one of the plurality of oil-carrying chambers 22 at the outer peripheral surface of the slide holder 2.

Referring to fig. 4, in the present embodiment, in order to enable the oil in the oil pipe 24 to enter the plurality of oil-carrying chambers 22 more uniformly and simultaneously. The oil inlet passage 23 includes a first passage 231, a second passage 232, and a plurality of third passages 233. The second passage 232 is an annular cavity coaxial with the connecting hole 21, and the second passage 232 surrounds the plurality of oil-carrying chambers 22. The first channel 231 is arranged between the second channel 232 and the outer surface of the sliding seat 2, and the first channel 231 enables the second channel 232 to be communicated with the oil pipe 24. The third channels 233 correspond to the oil-carrying chambers 22 one by one, and the third channels 233 communicate the oil-carrying chambers 22 with the second channels 232. Channel one 231 is offset from channel three 233.

Referring to fig. 3, air curtain members 4 are provided at both ends of the sliding seat 2, and the air curtain members 4 are provided to form an air curtain for blocking oil overflowing from the sliding gap 3 at the ends of the sliding seat 2, so as to prevent the oil in the oil-carrying chamber 22 from overflowing through the sliding gap 3 as much as possible.

Air curtain spare 4 can be by a plurality of high-pressure air nozzles constitute, high-pressure air nozzle and outside air supply intercommunication, a plurality of high-pressure air nozzles all face towards sliding gap 3. The high-pressure air ejected from the high-pressure air nozzles forms an air curtain at the sliding gap 3 at the end of the sliding seat 2.

Referring to fig. 5, in the present embodiment, the air curtain member 4 is an annular structure, the air curtain member 4 is sleeved on the periphery of the track 1, and an air guiding channel 41 is disposed between the inner wall of the air curtain member 4 and the outer peripheral surface of the air curtain member 4. The peripheral surface of the air curtain piece 4 is fixedly connected with an air duct 42 communicated with an external high-pressure air source. The air curtain piece 4 is attached to the end face of the sliding seat 2, and the air curtain piece 4 is mounted to the sliding seat 2. A ventilation gap 45 is provided between the air curtain member 4 and the rail 1.

An external oil source injects oil into the oil carrying cavities 22 through the oil pipe 24 and the oil inlet channel 23, and under the action of the oil in the oil carrying cavities 22, the rail 1 is coaxial with the connecting holes 21, and an oil pad surrounding the rail 1 is formed at the sliding gap 3, so that the friction force of the sliding seat 2 during movement on the rail 1 is reduced. In the process, high-pressure gas is injected into the ventilation gap 45 from an external high-pressure gas source through the gas guide pipe 42 and the air guide channel 41, the high-pressure gas in the ventilation gap 45 can block the excessive oil at the sliding gap 3, the oil in the sliding gap 3 is prevented from overflowing as far as possible, and the loss of the oil in the use process of the machine tool can be reduced as far as possible.

Referring to fig. 6, in order to facilitate the classified production of the air curtain member 4 and the sliding seat 2 and the classified transportation of the air curtain member 4 and the sliding seat 2. The air curtain piece 4 and the sliding seat 2 are detachably connected.

The air curtain piece 4 and the sliding seat 2 can be detachably connected through screws, namely the screws sequentially penetrate through the air curtain piece 4 and the sliding seat 2 from one side of the air curtain piece 4 far away from the sliding seat 2.

In this embodiment, one side of the air curtain member 4 facing the sliding seat 2 is integrally provided with a threaded pipe 43, the threaded pipe 43 is sleeved on the periphery of the rail 1, the corresponding sliding seat 2 is provided with a threaded hole 25 adapted to the threaded pipe 43, the threaded pipe 43 is in threaded connection with the sliding seat 2 through the threaded hole 25, and after the threaded pipe 43 is in threaded connection with the sliding seat 2, the inner wall of the threaded pipe 43 is flush with the inner wall of the connection hole 21.

The air curtain member 4 is connected with the sliding seat 2 through the threaded pipe 43, so that the sealing performance between the air curtain member 4 and the sliding seat 2 can be increased as much as possible.

The air guide passage 41 may be a straight hole formed between the outer peripheral surface of the air curtain member 4 and the inner wall of the air curtain member 4.

Referring to fig. 6, in the present embodiment, in order to more uniformly feed the air guide duct with high-pressure gas into the ventilation gap 45. The air guide passage 41 includes a main passage 411, a flow dividing chamber 412, and a plurality of branch passages 413. The branch chamber 412 is arranged in the air curtain member 4, and the branch chamber 412 is an annular chamber coaxial with the air curtain member 4; the main passage 411 communicates the branch chamber 412 with the air duct 42, the branch passages 413 communicate the branch chamber 412 with the ventilation gap 45, and the plurality of branch passages 413 are uniformly arranged around the axis of the air curtain member 4. Main channel 411 is offset from branch channel 413.

The high-pressure gas sent into the wind guide channel 41 by the wind guide pipe can be more uniformly sent into the ventilation gap 45 through the shunting action of the shunting cavity 412 and the plurality of branch channels 413.

An annular collecting groove 44 is formed in the inner wall of the air curtain piece 4, the collecting groove 44 is arranged around the axis of the air curtain piece 4, and the plurality of branch channels 413 are communicated with the collecting groove 44.

After the air flow is blown out from the branch passage 413, the air flow first enters the collecting groove 44, and the air flow is diffused into the collecting groove 44, so that the air flow blown to the ventilation gap 45 can be further more uniform.

The collection groove 44 opens toward the slide base 2. After the air flow is blown out from the branch passage 413 and flows to the sliding gap 3 under the guiding action of the collecting groove 44, the air curtain formed by the air flow in the sliding gap 3 has a better blocking effect on the oil.

Referring to fig. 5, further, two annular oil return cavities 26 are opened on the sliding seat 2 in the connecting hole 21, the oil return cavities 26 are arranged around the axis of the connecting hole 21, and the plurality of oil loading cavities 22 are all arranged between the two oil return cavities 26.

Two oil return passages 27 are seted up on the surface of sliding seat 2, and two oil return passages 27 respectively with two oil return chamber 26 one-to-one, oil return passage 27 makes oil return chamber 26 and outside intercommunication, and just for making the fluid in the oil return chamber 26 discharge more easily, oil return passage 27 is vertical to be set up in the bottom of oil return chamber 26. The oil return passage 27 communicates with an external oil collection tank.

The oil overflowing from the oil-carrying chamber 22 through the sliding gap 3 can enter the oil-returning chamber 26 and then be collected in the external oil collection tank. Meanwhile, the oil return cavity 26 is matched with an air curtain at the end part of the sliding seat 2, so that the oil overflow in the sliding process of the sliding seat 2 can be further reduced.

Referring to fig. 5, further, a pressure monitor 221 is disposed in the oil-carrying chamber 22, and a plurality of sets of pressure compensation passages 28 are disposed on the sliding seat 2, wherein each set of pressure compensation passages 28 includes a plurality of pressure compensation passages 28. The plurality of pressure compensating passages 28 in the same group correspond one-to-one to the plurality of oil-carrying chambers 22, respectively. Each pressure compensating passage 28 communicates with an external source of high pressure gas.

When the load on the sliding seat 2 is uneven, the pressure monitor 221 in the oil-carrying cavity 22 can monitor the change of the oil pressure in the oil-carrying cavity 22 and feed back the oil pressure signal to the external control center, and the external control center controls the external high-pressure air source to introduce high-pressure air into the corresponding pressure compensation channel 28 so as to compensate the oil pressure in the oil-carrying cavity 22, so that the part using the hydrostatic guideway on the machine tool is more stable in the working process.

Two sets of pressure compensating passages 28 are provided, two sets of pressure compensating passages 28 being provided at both ends of the oil-carrying chamber 22, respectively, and two sets of pressure compensating passages 28 being located between the two oil return chambers 26. When the oil carrying cavity 22 does not need pressure compensation, a small amount of gas is continuously introduced into the pressure compensation passage 28.

Therefore, when the pressure compensation channel 28 does not need to perform pressure compensation, a small amount of gas is continuously introduced into the pressure compensation channel 28, the sealing performance of the sliding gap 3 can be improved, meanwhile, oil in the sliding gap 3 can be prevented from entering the sliding gap 3 as far as possible, and the oil sealing performance of the hydrostatic guide rail on the machine tool is improved.

The implementation principle of the guide rail pair of the ultra-precise cylindrical hydrostatic numerical control machine tool in the embodiment of the application is as follows: the air current that outside air supply blew out passes through two air curtain spare 4 and continuously forms the air curtain at the both ends of sliding seat 2, and fluid in the year oil chamber 22 can enter into back oil chamber 26 at first through the in-process of the diffusion of sliding gap 3 outward to be collected in the fluid collecting box, and the cooperation of air curtain spare 4 at the air curtain that sliding gap 3 of sliding seat 2 tip formed and back oil chamber 26 can avoid fluid excessive as far as. At the same time, the pressure compensation channel 28 can compensate the oil pressure in the oil carrying chamber 22 when the load on the sliding seat 2 is uneven.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.