An integrated self-balancing hydraulic slewing device

Abstract

The invention discloses an integrated self-balancing hydraulic rotary device, comprising a shell, a motor in the shell, and the motor drives a supporting panel to rotate through a transmission shaft; a hydrostatic bearing matched with the transmission shaft is also arranged in the shell, the hydrostatic bearing is an internal feedback closed hydrostatic bearing, and the hydrostatic bearing is composed of three functional structures of an upper thrust bearing, a radial bearing and a lower thrust bearing; an oil film layer is formed between the functional structural surfaces of the hydrostatic bearing, the transmission shaft and the supporting panel corresponding to each other, and an oil storage tank is formed between the hydrostatic bearing, the shell and the transmission shaft; an oil circuit hole system is integrated on the shell, and the oil circuit hole system is connected to an external hydraulic system, and the oil circuit hole system is connected to an external hydraulic system and can supply oil to the oil film layer and the oil storage tank through the oil circuit hole system; the invention reduces the number of parts and components and the external oil circuit pipe, and uses liquid friction instead of mechanical friction, thereby improving the rotation accuracy and running stability of the rotary supporting panel, avoiding the wear of mechanical parts, and extending the service life of the product.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic rotary devices, and in particular to an integrated self-balancing hydraulic rotary device. Background Art

[0002] At present, the main turntable products of turntable development manufacturers in the world still basically use rolling bearings as the turntable rotation support, which has low precision, and rolling bearings are easy to wear, heat, and poor precision retention. At the same time, the drive is mostly motors through gear transmission or worm gear transmission, with low transmission efficiency and reverse clearance. At present, there are also many hydraulic turntable products in China, and whether it is external throttling, feedback throttling or constant current, multiple pipes are required to connect to each oil chamber, the oil circuit is complicated and cumbersome, the oil circuit is long, the response speed is slow, and it is easy to leak.

[0003] For a hydraulic rotary device, its housing usually needs to be connected to various pipelines to provide hydraulic oil and coolant through the pipelines when the hydraulic rotary device is working. However, a large number of pipelines connected to the housing will result in too many parts in the housing, which will lead to a complicated structure of the hydraulic rotary device and difficulty in ensuring sealing. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an integrated self-balancing hydraulic rotary device with only one oil supply and one oil return, a simple and beautiful oil circuit structure, good sealing and high stability.

[0005] Technical solution: To achieve the above-mentioned purpose, an integrated self-balancing hydraulic rotary device of the present invention includes a shell, a motor is arranged in the shell, and the motor drives the support panel to rotate through the transmission shaft; there is also a hydrostatic bearing in the shell that cooperates with the transmission shaft, and the hydrostatic bearing is an internal feedback closed hydrostatic bearing, and the hydrostatic bearing is composed of three functional structures of an upper thrust bearing, a radial bearing and a lower thrust bearing; an oil film layer is formed between the corresponding functional structural surfaces of the hydrostatic bearing, the transmission shaft and the support panel, and an oil storage tank is formed between the hydrostatic bearing, the shell and the transmission shaft; an oil path hole system is integrated on the shell, and the oil path hole system is connected to an external hydraulic system, and the oil path hole system is connected to the external hydraulic system and can supply oil to the oil film layer and the oil storage tank through the oil path hole system.

[0006] Furthermore, the oil storage tank includes an upper oil storage tank, a middle oil storage tank and a lower oil storage tank which are distributed in the upper, middle and lower parts;

[0007] The upper oil storage tank and the lower oil storage tank supply oil to the oil film layer of the upper thrust bearing and the lower thrust bearing of the hydrostatic bearing respectively through the throttle; the hydraulic oil in the middle oil storage tank supplies oil to the oil film layer of the radial bearing of the hydrostatic bearing through the throttle.

[0008] Furthermore, the oil circuit hole system includes an oil inlet circuit hole, a conducting oil circuit hole and an oil outlet circuit hole; the oil inlet circuit hole extends upward from the bottom of the shell to connect to the upper oil storage tank, the upper oil storage tank is connected to the middle oil storage tank and the lower oil storage tank through the conducting oil circuit hole in the shell, the lower oil storage tank is connected to the oil outlet circuit hole, and the oil outlet circuit hole extends downward out of the bottom of the shell.

[0009] Furthermore, a labyrinth seal is provided between the lower end surface edge of the support panel and the upper end surface edge of the shell to prevent the oil in the upper oil storage tank from leaking out; a skeleton oil seal is provided between the transmission shaft and the shell to prevent the oil in the lower oil storage tank from leaking out.

[0010] Furthermore, the motor is a torque motor, which consists of a stator and a rotor; there is a heat dissipation pipe in the stator, and there are water inlet loop holes and water outlet loop holes on the shell. The water inlet loop holes and the water outlet loop holes are externally connected to a water cooling device, and the water cooling device can provide circulating water to the heat dissipation pipe through the water inlet loop holes and the water outlet loop holes.

[0011] Furthermore, a support seat is provided at the bottom of the shell, and the motor is located in a cavity between the shell and the support seat; a transmission disc is connected to the rotor, and is connected to the transmission shaft through the transmission disc.

[0012] Furthermore, an outer ring portion is provided on the transmission shaft, the static pressure bearing is sandwiched between the outer ring portion and the support panel, and the outer ring portion is correspondingly located in the lower oil storage tank.

[0013] Furthermore, it also includes an oil circuit hole system externally connected to a hydraulic system, the oil inlet oil circuit hole and the oil outlet oil circuit hole are respectively connected to the oil outlet end of the hydraulic oil supply system and the oil return end of the hydraulic oil supply system; the oil circuit hole system externally connected to a hydraulic system includes an oil tank, and the oil supply oil circuit of the hydraulic oil supply system includes an oil outlet pump, a one-way valve, a solenoid valve, and a pressure reducing valve in sequence from the oil tank to the oil outlet end; the oil return circuit of the hydraulic oil supply system includes an oil return pump; the oil inlet end of the oil outlet pump is connected to the oil tank, the oil outlet end is connected to the oil inlet end of the one-way valve, the oil outlet end of the one-way valve is connected to the oil inlet end of the solenoid valve, and the solenoid valve is connected to the oil outlet end. The oil outlet end of the magnetic valve is connected to the oil inlet end of the pressure reducing valve, and the oil outlet end of the pressure reducing valve is the oil outlet end of the hydraulic oil supply system; it also includes a hydraulic accumulator, a pressure relay and b pressure relay, the pressure end of the hydraulic accumulator is connected to the oil pipe between the solenoid valve and the one-way valve through a pressure pipe bypass; the pressure end of the a pressure relay is bypassed and connected to the pressure pipe, the pressure end of the b pressure relay is bypassed and connected to the oil pipe connected to the oil outlet end of the pressure reducing valve, the a pressure relay is connected to the solenoid valve in linkage control, and the b pressure relay is connected to the return oil pump in linkage control.

[0014] Beneficial effect: The integrated self-balancing hydraulic slewing device of the present invention has an oil hole system and a water hole system integrated on the shell, which provides hardware support for the slewing device, reduces the number of parts and external pipes of the whole machine, makes the whole structure more compact and beautiful, and avoids the overflow of static oil and coolant due to too many pipes and joints, improves the slewing accuracy and running stability of the slewing bearing panel, avoids the wear of mechanical parts, and extends the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the overall structure of the hydraulic rotary device of the present invention;

[0016] Attached Figure 2 It is a bottom schematic diagram of the hydraulic rotary device of the present invention;

[0017] Attached Figure 3 for Figure 2 A cross-sectional view of the hydraulic rotary device at section AA, i.e., a schematic diagram of the oil outlet hole and the water outlet hole;

[0018] Attached Figure 4 for Figure 2 A cross-sectional view of the middle shell at section B, which is also a schematic diagram of the water inlet loop hole;

[0019] Attached Figure 5 for Figure 2 A cross-sectional view of the middle housing at section C, which is also a schematic diagram of the oil inlet hole;

[0020] Attached Figure 6 for Figure 2 A cross-sectional view of the middle housing at section D, which is also a schematic diagram of the oil passage hole;

[0021] Attached Figure 7 The oil circuit hole system is an external hydraulic system diagram. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] As attached Figures 1 to 7The integrated self-balancing hydraulic rotary device comprises a shell 1, in which there is a motor 2, the motor 2 drives the support panel 4 to rotate through the transmission shaft 3, and the support panel 4 is used to drive the workpiece to rotate, position and process precisely or even ultra-precisely; the shell 1 also has a hydrostatic bearing 5 matched with the transmission shaft 3, the hydrostatic bearing 5 is an internal feedback closed hydrostatic bearing, and the hydrostatic bearing 5 is composed of three functional structures: an upper thrust bearing, a radial bearing and a lower thrust bearing; an oil film layer is formed between the functional structural surfaces of the hydrostatic bearing 5, the transmission shaft 3 and the support panel 4 that correspond to each other, and an oil storage tank is formed between the hydrostatic bearing 5, the shell 1 and the transmission shaft 3; an oil circuit hole system is integrated on the shell 1, and the oil circuit hole system is externally connected to a hydraulic system, and the oil circuit hole system is externally connected to a hydraulic system that can supply oil to the oil film layer and the oil storage tank through the oil circuit hole system.

[0024] Since the housing 1 has an oil passage hole system, the pipelines that originally need to be outside are integrated inside the housing 1, thereby streamlining the entire machine structure and achieving a better sealing effect.

[0025] The oil storage includes an upper oil storage tank 6, a middle oil storage tank 100 and a lower oil storage tank 7 which are distributed in the upper, middle and lower parts. The upper oil storage tank 6 and the lower oil storage tank 7 are both annular tanks. The upper oil storage tank 6 and the lower oil storage tank 7 supply oil to the oil film layer of the upper thrust bearing and the lower thrust bearing of the hydrostatic bearing 5 respectively through a variable throttle. The hydraulic oil in the middle oil storage tank 100 supplies oil to the oil film layer of the radial bearing of the hydrostatic bearing 5 through a variable throttle. Specifically, each variable throttle makes opposite changes with the change of load to realize throttling and feedback, and there is an oil film layer between the radial bearing and the transmission shaft 3. The specific step end face on the transmission shaft 3 is equivalent to the tightening ring of the upper and lower thrust bearings, and the specific cylindrical surface is equivalent to the inner ring of the radial bearing. Under the action of fluid pressure, there is no mechanical contact between the working surface of the hydrostatic bearing 5 and the support panel 4 and the transmission shaft 3, so that the bearing and the shaft always remain relatively centered in the slewing bearing structure.

[0026] Taking the thrust bearing oil chamber as an example, when the support panel 4 is subjected to downward pressure, a gap change occurs, and the pressure in the upper thrust bearing oil chamber decreases due to the increase in the gap value. At the same time, the pressure loss in the throttle of the lower thrust bearing oil chamber increases due to the decrease in the gap value, which further reduces the pressure entering the upper thrust bearing oil chamber, thus achieving a feedback effect; similarly, the pressure in the lower thrust bearing oil chamber increases due to the decrease in the gap value. At the same time, the pressure loss in the throttle of the upper thrust bearing oil chamber decreases due to the increase in the gap, which further increases the pressure entering the lower thrust bearing oil chamber, thus achieving a feedback effect, which always allows the slewing bearing unit to automatically reach a balanced state. The radial bearing feedback working principle is the same and will not be repeated here.

[0027] Since the internal feedback hydrostatic bearing and its working principle are already mature technical theories, this patent will no longer describe in detail the working principle of the hydrostatic bearing and its feedback mechanism and the various performance advantages of the internal feedback hydrostatic bearing.

[0028] Therefore, no matter what the viscosity of the hydraulic oil and the manufacturing tolerances of the slewing device components are, when subjected to external loads, the self-balancing hydraulic slewing device of the present invention can always adjust to the optimal oil film layer pressure, so that the slewing support structure parts always remain relatively centered and automatically adjust to a balanced and stable state. The support panel 4 can ensure high-precision and high-smoothness operation under the action of the internal feedback closed static pressure slewing support mechanism.

[0029] The housing 1 has a support seat 17 at the bottom, and the motor 2 is located in a cavity between the housing 1 and the support seat 17. The rotor 14 is fixedly connected with a transmission plate 18. Figure 3 As shown in , the upper end of the transmission disc 18 is fixedly connected to the third step end surface of the lower end of the transmission shaft 3, so that the rotor 14 can be connected to the transmission shaft 3 through the transmission disc 18, and then the rotor 14 drives the transmission shaft 3 to rotate.

[0030] The oil passage hole system includes an oil inlet hole 8, a conducting oil passage hole 9 and an oil outlet hole 10. Figure 5 As shown in FIG, the oil inlet hole 8 extends upward from the bottom of the housing 1 to connect to the upper oil storage tank 6. Figure 6 As shown in FIG, the upper oil storage tank 6 is connected to the middle oil storage tank 100 and the lower oil storage tank 7 through the oil passage hole 9 in the housing 1. Figure 3 As shown in the figure, the lower oil storage tank 7 is connected to the oil outlet hole 10, and the oil outlet hole 10 extends downward from the bottom of the housing 1. Figure 3 , 5 As shown in 6, radial holes intersecting the oil outlet hole 10, the oil inlet hole 8 and the conducting hole 9 are provided in the housing 1. When the hydraulic rotary device is working, a sealing plug is used to block the openings of these radial holes distributed on the outer cylindrical surface of the housing 1.

[0031] In addition, a positioning fit with a very small clearance and slight interference is adopted between the outer diameter of the internal feedback closed hydrostatic bearing and the inner diameter of the upper chamber of the housing 1 .

[0032] When the hydraulic rotary device is working, the hydraulic oil enters the oil inlet hole 8 in the housing 1 from the inlet on the bottom surface of the support seat 17, and one path of oil is injected into the upper oil storage tank 6; the other path of oil is injected into the oil storage tank 100 on the inner cylindrical surface of the housing 1 that cooperates with the hydrostatic bearing 5 through the radial hole. The pressure oil in the upper oil storage tank 6 enters the lower oil storage tank 7 through the conducting oil path hole 9. Due to the friction in the hydrostatic output and the bearing groove, the oil temperature rises. In order to keep the entire device at the same temperature level, the hydraulic oil in the lower oil storage tank 7 flows through the oil outlet hole 10 and flows back to the oil tank from the outlet on the support seat 17. The oil in the oil tank is pumped out of the oil tank by a circulating pump, and then sent back to the oil tank after passing through the cooler.

[0033] The support panel 4 is separated from the upper thrust bearing by a gap, and the gap between the support panel 4 and the upper thrust bearing is connected to the upper oil storage tank 6, so that an oil film layer can also be formed in the gap between the support panel 4 and the upper thrust bearing. In addition, the support panel 4 is fastened to the upper end of the transmission shaft 3 through a threaded pair.

[0034] A labyrinth seal 11 is provided between the lower end edge of the support panel 4 and the upper end edge of the housing 1 to prevent the oil in the upper oil reservoir 6 from leaking out. A skeleton oil seal 12 is provided between the transmission shaft 3 and the housing 1 to prevent the oil in the lower oil reservoir 7 from leaking out. Figure 3 As shown in FIG. 1 , the skeleton oil seal 12 is installed between the fourth step end surface area at the lower end of the transmission shaft 3 and the housing 1 .

[0035] The motor 2 is a torque motor, which is composed of a stator 13 and a rotor 14. The torque motor has the advantages of low speed, high torque, strong overload capacity, fast response, good linearity, small torque fluctuation, etc. The torque motor is rigidly connected to the transmission shaft 3, does not require a reduction mechanism, and runs smoothly with high precision.

[0036] The stator 13 has a heat dissipation pipe inside. Figure 3 and 4 As shown in the figure, the shell 1 has a water inlet loop hole 15 and a water outlet loop hole 16, and the water inlet loop hole 15 and the water outlet loop hole 16 are connected to an external water cooling device, and the water cooling device can provide circulating water to the heat pipe through the water inlet loop hole 15 and the water outlet loop hole 16. Specifically, the heat pipe is laid in the groove on the outer cylindrical surface of the torque motor stator 13, and the external water cooling device will pump cooling water from the water inlet on the bottom surface of the support seat 17 into the water inlet loop hole 15, and the water inlet loop hole 15 is connected with the inlet of the heat pipe. When the cooling water passes through the heat pipe, it takes away the heat generated by the motor 2, and the heated water flows out from the outlet at the other end of the heat pipe. The outlet of the heat pipe is connected with the water outlet loop hole 16. After the cooling water enters the water outlet loop hole 16, it flows back to the external water cooling device from the water outlet on the bottom surface of the bottom support seat 17, completing a cooling water circulation process to solve the heat dissipation problem of the motor 2.

[0037] In addition, radial holes intersecting the water inlet loop hole 15 and the water outlet loop hole 16 are also provided in the shell 1. When the hydraulic rotary device is working, sealing plugs are also used to block the openings of these radial holes distributed on the outer cylindrical surface of the shell 1.

[0038] As attached Figure 3 As shown in the figure, there is an outer ring portion 19 on the transmission shaft 3, the hydrostatic bearing 5 is sandwiched between the outer ring portion 19 and the support panel 4, and the outer ring portion 19 is correspondingly located in the lower oil storage tank 7, and there is a certain gap between the upper end surface of the outer ring portion 19 and the lower end surface of the hydrostatic bearing 5.

[0039] The present invention integrates the support panel 4 with the transmission shaft 3 and the motor 2 in structure. It integrates liquid static pressure technology, cooling and sealing control technology, torque motor technology, etc., to realize the functions of driving the workpiece to rotate, position and process precisely or even ultra-precisely. The housing 1 with integrated oil circuit integrates various pipelines that originally need to be connected externally into the parts of the housing 1 by using a cross hole system that intersects axially and radially, thereby streamlining the whole machine structure and achieving a better sealing effect. The present invention can provide functional components with high precision, stable operation and strong anti-overturning ability for various types of precision machine tools and testing equipment, such as gear hobbing machines, vertical lathes, machining centers, vertical grinders, three-coordinate measuring machines, etc.

[0040] like Figure 7 As shown, the present scheme also designs an oil circuit hole system for the rotary device to be externally connected to a hydraulic system 90, and the oil inlet oil circuit hole 8 and the oil outlet oil circuit hole 10 are respectively connected to the oil outlet end 29 of the hydraulic oil supply system and the oil return end 30 of the hydraulic oil supply system; the oil circuit hole system is externally connected to the hydraulic system 90 and includes an oil tank 70, and the oil supply oil circuit of the hydraulic oil supply system includes an oil outlet pump 40, a one-way valve 36, a solenoid valve 35, and a pressure reducing valve 33 from the oil tank 70 to the oil outlet end 29; the oil return oil circuit of the hydraulic oil supply system includes an oil return pump 45; the oil inlet end of the oil outlet pump 40 is connected to the oil tank 70, and the oil outlet end is connected to the oil inlet end of the one-way valve 36, and the oil outlet end of the one-way valve 36 is connected to the oil inlet end of the solenoid valve 35, and the oil outlet end of the solenoid valve 35 is connected to the oil inlet end of the pressure reducing valve 33, and the oil outlet end of the pressure reducing valve 33 is a hydraulic supply The oil system oil outlet 29; also includes a hydraulic accumulator 34, a pressure relay 28 and b pressure relay 31, the pressure end of the hydraulic accumulator 34 is bypassed and connected to the oil pipe between the solenoid valve 35 and the one-way valve 36 through a pressure pipe 1000; the pressure end of the a pressure relay 28 is bypassed and connected to the pressure pipe 1000, the pressure end of the b pressure relay 31 is bypassed and connected to the oil pipe connected to the oil outlet end of the pressure reducing valve 33, the a pressure relay 28 is connected to the solenoid valve 35 in linkage control, and the b pressure relay 31 is connected to the oil return pump 45 in linkage control; also includes a relief valve 44 and b relief valve 37, the a relief valve 44 is connected in parallel with the oil return pump 45; the oil inlet end of the b relief valve 37 is connected to the oil inlet end of the one-way valve 36, and the oil outlet end is connected to the oil tank 70;

[0041] The working principle of the external hydraulic system of the oil passage hole system: in the initial state, the solenoid valve 35 and the return oil pump 45 are both in the closed state, and then the oil outlet pump 40 is started. Under the drive of the oil outlet pump 40, the hydraulic oil in the oil tank 70 passes through the oil outlet pump 40 and the one-way valve 36 upward in turn. Since the solenoid valve 35 is in the closed state, the hydraulic oil flowing out of the one-way valve 36 is gradually pressed into the hydraulic accumulator 34 through the pressure pipe 1000, so that the hydraulic accumulator 34 is gradually charged, thereby gradually increasing the pressure at the pressure end of the hydraulic accumulator 34, and then the pressure at the pressure end of the a pressure relay 28 gradually increases synchronously with the pressure at the pressure end of the hydraulic accumulator 34; as the hydraulic accumulator 34 is continuously charged, when the pressure at the pressure end of the a pressure relay 28 rises to P1, it means that the hydraulic accumulator 34 has been fully charged, and the a pressure relay 28 controls the solenoid valve 35 to open, and then the hydraulic oil is pressed into the oil storage tank in the self-balancing hydraulic rotary device through the solenoid valve 35 and the pressure reducing valve 33, so that the oil in the closed hydrostatic bearing rotary device The oil hole system, the oil film layer and the oil storage tank are gradually filled with oil and pressurized. When the oil pressure in the self-balancing hydraulic rotary device rises to P2, the self-balancing hydraulic rotary device enters the working state and starts to rotate. At the same time, after the pressure at the pressure end of the b pressure relay 31 rises to more than P2, the b pressure relay 31 controls the return oil pump 45 to operate, and makes the pumping oil flow of the return oil pump 45 basically consistent with the pumping oil flow of the oil outlet pump 40, so that on the basis of maintaining the oil hole system, the oil film layer and the pressure in the oil storage tank in the closed hydrostatic bearing rotary device stable, the hydraulic oil in the oil hole system, the oil film layer and the oil storage tank in the self-balancing hydraulic rotary device is continuously discharged, so as to achieve the purpose of continuously cooling and discharging the heat in the self-balancing hydraulic rotary device; when the pressure of the b pressure relay 31 drops to the preset value, the b pressure relay 31 controls the return oil pump 45 to close. In this case, P1 is greater than P2, and P2 is the hydraulic working pressure of the oil storage tanks 6, 100, and 7 in the self-balancing hydraulic rotary device;When the oil outlet pump 40 stops running due to a fault, the hydraulic accumulator 34 will continue to supply oil to the pressure reducing valve 33, thereby maintaining the normal operation of the self-balancing hydraulic rotary device. If the oil outlet pump 40 can eliminate the fault in a short time, the system will automatically continue to operate stably. If the fault of the oil outlet pump 40 is not eliminated in a short time, the pressure at the pressure end of the hydraulic accumulator 34 will gradually decrease with the release of oil, and the pressure at the pressure end of the hydraulic accumulator 34 will gradually decrease from P1 to P2, so that the inlet and outlet ends of the pressure reducing valve 33 are consistent, and the pressure continues to decrease synchronously. When the pressure of the b pressure relay 31 begins to drop below P2, the b pressure relay 31 controls the return oil pump 45 to close, thereby sealing the return oil. Pipeline, thereby avoiding further reduction of hydraulic oil pressure in the oil circuit hole system, oil film layer and oil storage tank in the self-balancing hydraulic rotary device, thereby ensuring that the self-balancing hydraulic rotary device can basically maintain normal operation and avoid damage due to internal wear. At this time, since the oil circuit circulation has been suspended, the heat in the self-balancing hydraulic rotary device is not easy to discharge, so the self-balancing hydraulic rotary device needs to be gradually suspended. This process reserves sufficient buffer time for the stopping process of the self-balancing hydraulic rotary device to avoid the problem that when the oil circuit hole system external hydraulic system fails, the pressure in the self-balancing hydraulic rotary device drops rapidly, and the rotating structure in the self-balancing hydraulic rotary device cannot stop immediately due to inertia, causing wear and damage. Although the above scheme solves the problem of instantaneous failure of the hydraulic device when the oil outlet pump 40 stops running due to a fault, it cannot ensure that the device continues to operate normally. For this purpose, the following improvement scheme is provided: the return oil pump 45 of this case is a bidirectional liquid pump, and the pressure reducing valve 33 is a pressure reducing valve that allows reverse flow. The pressure reducing valve 33 does not have a pressure reducing function during reverse flow, and the return oil pump 45 acts as a normal oil return function when it is running in the forward direction; when the return oil pump 45 runs in the reverse direction, the liquid in the return oil pipe connected to the return oil pump 45 flows in the reverse direction and continuously extracts the hydraulic oil in the oil tank 70 and presses it into the closed hydrostatic rotary device through the return oil end 30 of the hydraulic oil supply system; on the basis of the normal operation of the external hydraulic system of the oil passage hole system, once the oil outlet pump 40 stops running due to a fault, the return oil pump 45 is immediately controlled to periodically alternate forward and reverse operation, so that the hydraulic accumulator 34 follows and performs periodic release and energy storage actions, ensuring that a certain hydraulic pressure and flow are still maintained in the closed hydrostatic rotary device, thereby maintaining the temporary normal operation of the system in a short period of time. ;

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated self-balancing hydraulic rotary device, characterized in that: The invention comprises a housing (1), wherein a motor (2) is arranged in the housing (1), and the motor (2) drives a support panel (4) to rotate via a transmission shaft (3); the housing (1) also comprises a hydrostatic bearing (5) matched with the transmission shaft (3), wherein the hydrostatic bearing (5) is an internal feedback closed hydrostatic bearing, and the hydrostatic bearing (5) is composed of three functional structures, namely an upper thrust bearing, a radial bearing and a lower thrust bearing; an oil film layer is formed between the functional structural surfaces of the hydrostatic bearing (5), the transmission shaft (3) and the support panel (4), which correspond to each other, and an oil storage tank is formed between the hydrostatic bearing (5), the housing (1) and the transmission shaft (3); an oil path hole system is integrated on the housing (1), and the oil path hole system is externally connected to a hydraulic system (90), and the oil path hole system is externally connected to the hydraulic system (90) and can supply oil to the oil film layer and the oil storage tank via the oil path hole system; The oil storage tank comprises an upper oil storage tank (6), a middle oil storage tank (100) and a lower oil storage tank (7) which are arranged in an upper, middle and lower position; The upper oil storage tank (6) and the lower oil storage tank (7) supply oil to the oil film layer of the upper thrust bearing and the lower thrust bearing of the hydrostatic bearing (5) respectively through the throttle; the hydraulic oil in the middle oil storage tank (100) supplies oil to the oil film layer of the radial bearing of the hydrostatic bearing (5) through the throttle; The oil passage hole system comprises an oil inlet passage hole (8), a conducting passage hole (9) and an oil outlet passage hole (10); the oil inlet passage hole (8) extends upward from the bottom of the housing (1) to connect to the upper oil storage tank (6); the upper oil storage tank (6) is connected to the middle oil storage tank (100) and the lower oil storage tank (7) through the conducting passage hole (9) in the housing (1); the lower oil storage tank (7) is connected to the oil outlet passage hole (10); and the oil outlet passage hole (10) extends downward out of the bottom of the housing (1).

2. The integrated self-balancing hydraulic rotary device according to claim 1, characterized in that: A labyrinth seal (11) is provided between the lower end surface edge of the support panel (4) and the upper end surface edge of the shell (1) to prevent the oil in the upper oil storage tank (6) from leaking out; and a skeleton oil seal (12) is provided between the transmission shaft (3) and the shell (1) to prevent the oil in the lower oil storage tank (7) from leaking out.

3. The integrated self-balancing hydraulic rotary device according to claim 2, characterized in that: The motor (2) is a torque motor, which is composed of a stator (13) and a rotor (14); a heat dissipation pipe is arranged in the stator (13); a water inlet loop hole (15) and a water outlet loop hole (16) are arranged on the housing (1); the water inlet loop hole (15) and the water outlet loop hole (16) are externally connected to a water cooling device, and the water cooling device can provide circulating water to the heat dissipation pipe through the water inlet loop hole (15) and the water outlet loop hole (16).

4. The integrated self-balancing hydraulic rotary device according to claim 3, characterized in that: The housing (1) has a support seat (17) at the bottom, and the motor (2) is located in a cavity between the housing (1) and the support seat (17); the rotor (14) is connected to a transmission disc (18) and is connected to a transmission shaft (3) via the transmission disc (18).

5. The integrated self-balancing hydraulic rotary device according to claim 4, characterized in that: The transmission shaft (3) has an outer ring portion (19), the static pressure bearing (5) is sandwiched between the outer ring portion (19) and the support panel (4), and the outer ring portion (19) is correspondingly located in the lower oil storage tank (7).

6. The integrated self-balancing hydraulic rotary device according to claim 5, characterized in that: The oil circuit hole system is also provided to be connected to an external hydraulic system (90), wherein the oil inlet oil circuit hole (8) and the oil outlet oil circuit hole (10) are connected to the oil outlet end (29) of the hydraulic oil supply system and the oil return end (30) of the hydraulic oil supply system respectively; the oil circuit hole system is connected to the external hydraulic system (90) and includes an oil tank (70); the oil supply circuit of the hydraulic oil supply system includes an oil outlet pump (40), a one-way valve (36), an electromagnetic valve (35), and a pressure reducing valve (33) from the oil tank (70) to the oil outlet end (29); the oil return circuit of the hydraulic oil supply system includes an oil return pump (45); the oil inlet end of the oil outlet pump (40) is connected to the oil tank (70), the oil outlet end is connected to the oil inlet end of the one-way valve (36), the oil outlet end of the one-way valve (36) is connected to the oil inlet end of the electromagnetic valve (35), and the electromagnetic valve (35) ) an oil outlet end is connected to an oil inlet end of a pressure reducing valve (33), and the oil outlet end of the pressure reducing valve (33) is an oil outlet end (29) of a hydraulic oil supply system; it also includes a hydraulic accumulator (34), a pressure relay (28) and a pressure relay (31), the pressure end of the hydraulic accumulator (34) is bypass-connected to an oil pipe between a solenoid valve (35) and a one-way valve (36) through a pressure pipe (1000); the pressure end of the pressure relay (28) is bypass-connected to the pressure pipe (1000), the pressure end of the pressure relay (31) is bypass-connected to an oil pipe connected to the oil outlet end of the pressure reducing valve (33), the pressure relay (28) is connected to the solenoid valve (35) in a linkage control manner, and the pressure relay (31) is connected to an oil return pump (45) in a linkage control manner.

Images