A high speed hydraulic rotary union

Abstract

A high-speed hydraulic rotary joint includes a rotary inlet pipe and a bearing coaxially arranged with the rotary inlet pipe; the right end of the rotary inlet pipe is fixedly connected to the left side of the outer ring of the bearing, and a rotary outlet pipe is coaxially fixed to the right side of the inner ring of the bearing; a quick-release unit is coaxially arranged at the left end of the rotary inlet pipe, the quick-release unit including a rotary joint, a rotation limiting sleeve, and a translation limiting sleeve; the right end of the rotary joint is coaxially fixed with the rotary inlet pipe and its inner cavity is connected; a rotation limiting sleeve is sleeved on the outer side of the left end of the rotary joint, and a rotation limiting groove with an opening at the right end is formed axially on the cylindrical wall of the rotation limiting sleeve; a translation limiting sleeve is sleeved on the outer side of the rotation limiting sleeve. It is slidably connected to the rotating limiting sleeve, and the cylindrical wall of the translation limiting sleeve is inclined along the circumference with a translation limiting groove with an opening at the right end; the circumferential surface of the rotary joint is provided with a cylindrical limiting pin along the radial direction; the limiting pin passes through the limiting space formed by the intersection of the rotating limiting groove and the translation limiting groove; it can not only filter and clean the fluid medium in the high-speed hydraulic rotary joint and collect solid impurities in the fluid medium; but also cut off the unfiltered fluid medium from entering the equipment after the solid impurities in the filter unit reach a certain amount, and at the same time prompt the filter unit to be replaced to prevent solid impurities from entering the equipment through the fluid medium.

Description

Technical Field

[0001] This invention relates to the field of rotary joint technology, and more particularly to high-speed hydraulic rotary joints. Background Technology

[0002] Rotary joints are typically used to introduce oil or air into rotating mechanisms to control and distribute the oil or air within the rotating mechanism. Rotary joints can be classified into single-channel rotary joints and multi-channel rotary joints according to the number of delivery channels. Multi-channel rotary joints are the most commonly used because they can be used to introduce two or more different media into a high-speed rotating shaft through different channels.

[0003] Currently, when using high-speed hydraulic rotary joints connected to oil or air circuits, the long-term flow of the medium in the oil or air circuits causes wear on the pipelines. The debris generated by the wear is carried into the pipelines by the flowing medium and eventually enters the equipment and control unit, causing equipment damage or a decrease in the control accuracy of the control unit.

[0004] A high-speed hydraulic rotary joint (202310316238.4) known to the inventor includes a housing, a spindle end cover, a tail cover, a rear cover, a front cover, and a spindle. The rear cover and front cover are threaded onto both ends of the housing, respectively. The spindle end cover and tail cover are mounted on the end of the rear cover furthest from the housing. The spindle end cover is located between the tail cover and the rear cover. A first O-ring seal is provided between the rear cover and the tail cover. A tail cover oil seal is provided between the spindle end cover and the tail cover. A fourth O-ring seal and a fifth O-ring seal are provided between the rear cover and the front cover and the housing. The fourth O-ring seal is located within the housing. On the inner wall of the housing, the fifth O-ring seal is located on the outer surfaces of both ends of the housing. A spindle is rotatably mounted inside the housing. A left bearing and a right bearing are respectively interference-fitted at both ends of the spindle. The right bearing is located inside the rear cover and the right bearing is located inside the front cover. One end of the spindle near the spindle end cap moves through the housing and is located inside the rear cover. The other end of the spindle away from the spindle end cap moves through both the housing and the front cover and is located outside the front cover. Cooling water flanges are threaded onto the top of both the housing and the front cover. Two oil port flanges are threaded onto the bottom of the housing. An oil drain flange is threaded onto the side of the housing. However, in implementing the technical solutions in the above-mentioned embodiments, the inventors discovered that the above technology has at least the following technical problems:

[0005] Because the fluid medium flowing through the high-speed hydraulic rotary joint contains certain solid impurities, and these solid impurities are not easily detected, it is time-consuming and laborious to replace the fluid medium regularly. After the solid impurities accumulate to a certain amount, they can easily damage the equipment and shorten its service life. Summary of the Invention

[0006] The purpose of this invention is to provide a high-speed hydraulic rotary joint that can filter and clean the fluid medium in the high-speed hydraulic rotary joint, collecting solid impurities in the fluid medium; and can also cut off the unfiltered fluid medium from entering the equipment when the solid impurities in the filter unit reach a certain amount, while prompting to replace the filter unit to prevent solid impurities from entering the equipment through the fluid medium.

[0007] The present invention adopts the following technical solution:

[0008] A high-speed hydraulic rotary joint includes a rotary inlet pipe and a bearing coaxially arranged with the rotary inlet pipe; the right end of the rotary inlet pipe is fixedly connected to the left side of the outer ring of the bearing, and a rotary outlet pipe is coaxially fixed to the right side of the inner ring of the bearing; a quick-release unit is coaxially arranged at the left end of the rotary inlet pipe, the quick-release unit including a rotary joint, a rotation limiting sleeve, and a translation limiting sleeve; the right end of the rotary joint is coaxially fixed with the rotary inlet pipe and its inner cavity is connected; a rotation limiting sleeve is sleeved on the outer side of the left end of the rotary joint, and a rotation limiting groove with an opening at the right end is formed axially on the cylindrical wall of the rotation limiting sleeve; a translation limiting sleeve is sleeved on the outer side of the rotation limiting sleeve and slidably connected with the rotation limiting sleeve, and a translation limiting groove with an opening at the right end is formed obliquely in the circumferential direction on the cylindrical wall of the translation limiting sleeve; a cylindrical limiting pin is radially arranged on the circumferential surface of the rotary joint; the limiting pin passes through the limiting groove formed by the intersection of the rotation limiting groove and the translation limiting groove. Within the space, a filter unit coaxial with the rotary joint is also installed in the inner cavity of the translational limiting sleeve on the left side of the rotating limiting sleeve. The filter unit includes a filter structure, a flow divider plate, and a first oil outlet pipe. The first oil outlet pipe passes through the left end face of the rotating limiting sleeve and contacts the left end face of the rotary joint. The filter structure is fixedly connected to the left end of the first oil outlet pipe, and the filter structure is coaxially arranged with the first oil outlet pipe. The flow divider plate is coaxially fixed to the left end of the filter structure. The flow divider plate is located inside the translational limiting sleeve and is fixedly connected with the translational limiting sleeve. A moving track is also provided on the outer surface of the first oil outlet pipe. The moving track is located on the outer surface of the left-side boss located on the left end of the first oil outlet pipe. The pressure change inside the translational limiting sleeve drives the rotating limiting sleeve to move along the track, driving the limiting space to disengage from the limiting pin. An oil pipe pressure holding device is coaxially arranged with the left end of the translational limiting sleeve, and the oil pipe pressure holding device is threadedly connected to the translational limiting sleeve.

[0009] Furthermore, the inner cavity of the rotary joint is a stepped circular hole with a tapered hole at the left end. A second pressure-stabilizing structure is coaxially arranged inside the circular hole. This second pressure-stabilizing structure includes a second guide plate, a second return spring, and a second plug. The second guide plate is coaxially arranged with the rotary joint and fixedly connected to its inner cavity. The second plug, in a frustum shape, is inserted into the tapered hole at the left end of the rotary joint's inner cavity. The right end of the second plug is fixedly connected to a second guide rod, which coaxially passes through the second guide plate and is slidably connected to it. One end of the second return spring is connected to the second plug, and the other end is connected to the second guide plate. This design ensures that the second pressure-stabilizing structure prevents oil flow after the high-speed hydraulic rotary joint is disconnected, thus maintaining pressure.

[0010] Furthermore, the first pressure stabilizing structure includes a first plug, a first guide plate, a first reset spring, and a first guide rod. The first guide plate is coaxially fixed with the first oil outlet pipe, and a plurality of oil guide holes are opened on the first guide plate. The first plug is frustum-shaped and inserted into the tapered hole at the right end of the inner cavity of the first oil outlet pipe. The left end of the first plug is fixedly connected to the first guide rod. The first guide rod is coaxially inserted through the first guide plate to the inner cavity of the pressure holding unit, and its left end contacts the right surface of the ball valve. The first guide rod is slidably connected to the first guide plate.

[0011] Furthermore, the pressure-holding unit includes a accommodating chamber disposed within the inner cavity. The accommodating chamber includes a mounting plate distributed at the second oil outlet pipe on the right end. The mounting plate is coaxially fixed within the inner cavity of the pressure-holding unit. A first guide hole is provided at the center of the mounting plate. A hollow boss is fixed at the left end of the mounting plate. A second guide hole is provided at the center of the left end face of the boss. A third return spring is provided on the left end face of the inner cavity of the boss. The left end of the third return spring is fixed to the left end face of the inner cavity of the boss. A circular ball valve is fixedly connected to the right end of the third return spring. The ball valve is in contact with the first guide hole. The outer surface of the right end of the ball valve is in contact with the left end face of the second guide rod passing through the first guide hole. During replacement, the pressure-holding unit and the translation limit sleeve are disconnected, allowing the oil to remain inside the pressure-holding unit for easy replacement.

[0012] Furthermore, the filter structure includes a fixed frame and an annular filter element. The fixed frame has a cylindrical structure in the middle, with several filter holes evenly distributed around the cylindrical wall. An annular filter element is coaxially arranged on the outer side of the cylindrical structure. Filter element end caps are respectively provided at the left and right ends of the fixed frame. The cross-section of the filter element end cap is U-shaped. The inner surface of the U-shaped opening and the outer surface of the cylindrical structure in the middle of the fixed frame form a space for accommodating the annular filter element. The left end cap of the filter structure is fixedly connected to a flow divider plate, and the right end cap is fixedly connected to a first oil outlet pipe.

[0013] Furthermore, the flow divider is shaped like a frustum, which effectively and evenly distributes the oil flowing out of the second oil outlet pipe to the circumference of the flow divider; the flow divider is also evenly provided with 6 sets of drainage holes along the circumference, and a circular one-way valve is coaxially provided on the right side. The one-way valve has a frustum-shaped cross-section and a diameter equal to that of the flow divider.

[0014] Furthermore, a circular through hole is provided on the left end face of the rotating limiting sleeve, and a hemispherical limiting block is provided circumferentially at the opening.

[0015] Furthermore, the moving track is provided on the outer surface of the left boss of the first oil outlet pipe, including a horizontal track and a circumferential track. The circumferential track is arranged circumferentially along the outer surface of the boss, and the horizontal track is axial and passes through the left boss of the first oil outlet pipe. The cross-sections of the horizontal track and the circumferential track are hemispherical, which are used to cooperate with the movement of the limiting block. When the rotating limiting sleeve is located in the horizontal track of the moving track, the rotating limiting sleeve and the translational limiting sleeve are slidably connected in the left and right directions. When the rotating limiting sleeve is located in the circumferential track of the moving track, the rotating limiting sleeve and the horizontal translational limiting sleeve can rotate relative to each other.

[0016] Furthermore, the right end face of the first plug is fitted to the left end face of the second plug.

[0017] Furthermore, the angle formed by the translational limiting groove and the rotational limiting groove is an acute angle.

[0018] This invention can both filter and clean the fluid medium in a high-speed hydraulic rotary joint, collecting solid impurities from the fluid medium; and when the amount of solid impurities in the filter unit reaches a certain level, it can cut off the unfiltered fluid medium from entering the equipment, while simultaneously prompting the replacement of the filter unit to prevent solid impurities from entering the equipment through the fluid medium. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-speed hydraulic rotary joint in this invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of the high-speed hydraulic rotary joint in this invention;

[0021] Figure 3 This is a schematic diagram of the limiting space in this invention;

[0022] Figure 4 This is a schematic diagram of the rotary joint in this invention;

[0023] Figure 5 This is a schematic diagram of the rotating limiting sleeve in this invention;

[0024] Figure 6 This is a schematic diagram of the translational limiting sleeve in this invention;

[0025] Figure 7 This is a schematic diagram of the structure of the filter unit in this invention;

[0026] Figure 8 This is a cross-sectional schematic diagram of the filter structure in this invention;

[0027] Figure 9 This is a schematic diagram of the second voltage stabilizing structure in this invention;

[0028] Figure 10 This is a schematic diagram of the structure of the first oil outlet pipe in this invention;

[0029] Figure 11 This is a schematic diagram of the pressure-holding unit of the present invention. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0031] like Figures 1 to 11 As shown, the high-speed hydraulic rotary joint of the present invention includes a rotary oil inlet pipe 3 and a bearing 2 coaxially arranged with the rotary oil inlet pipe 3; the right end of the rotary oil inlet pipe 3 is fixedly connected to the left side of the outer ring of the bearing 2, and the rotary oil outlet pipe 1 is coaxially fixed to the right side of the inner ring of the bearing 2; during operation, the oil at the input end is pumped to the rotary oil inlet pipe 3 and reaches the designated output end device through the rotary oil outlet pipe 1. With the input end fixed, the output end device adjusts its working posture by rotating relative to the input end through the bearing 2.

[0032] Because solid impurities exist inside the oil during circulation, they reduce the service life of the output equipment, and regular oil replacement is time-consuming and laborious. In this invention, a quick-release unit 4 is coaxially arranged at the left end of the rotary oil inlet pipe 3. The quick-release unit 4 includes a rotary joint 4-1, a rotation limiting sleeve 4-3, and a translation limiting sleeve 4-4. The right end of the rotary joint 4-1 is coaxially fixed with the rotary oil inlet pipe 3 and its inner cavity is connected. A rotation limiting sleeve 4-3 is sleeved on the outer side of the left end of the rotary joint 4-1. A rotation limiting groove 4-3-1 with an opening at the right end is axially opened on the cylinder wall of the rotation limiting sleeve 4-3. The translation limiting sleeve 4-4... -4 is fitted outside the rotating limiting sleeve 4-3 and is slidably connected to the rotating limiting sleeve 4-3 in the left and right directions. The cylindrical wall of the translation limiting sleeve 4-4 is inclined with a translation limiting groove 4-4-1 with an opening at the right end along the circumferential direction. The circumferential surface of the rotary joint 4-1 is provided with a cylindrical limiting pin 4-1-2 along the radial direction. The limiting pin 4-1-2 passes through the limiting space 4-5 formed by the intersection of the rotating limiting groove 4-3-1 and the translation limiting groove 4-4-1. When the high-speed hydraulic rotary joint is working normally, the limiting pin 4-1-2 cannot be disengaged from the limiting space, and the quick-release unit 4 is tightly connected to the rotary oil inlet pipe 3.

[0033] A filter unit 5, coaxial with the rotary joint 4-1, is also provided in the inner cavity of the translational limiting sleeve 4-4 on the left side of the rotation limiting sleeve 4-3. The filter unit 5 includes a filter structure 5-6, a flow divider 5-2, and a first oil outlet pipe 5-5. The first oil outlet pipe 5-5 passes through the left end face of the rotation limiting sleeve 4-3 and contacts the left end face of the rotary joint 4-1. The filter structure 5-6 is fixedly connected to the left end of the first oil outlet pipe 5-5, and the filter structure 5-6 is coaxially arranged with the first oil outlet pipe 5-5. The flow divider 5-2 is coaxially fixed to the left end of the filter structure 5-6. The flow divider 5-2 is disposed inside the translational limiting sleeve 4-4 and fixedly connected to the translational limiting sleeve 4-4. In this invention, the oil enters the translational limiting sleeve 4-4 and passes through the flow divider 5-6. -2 is diverted and filtered by the filter structure 5-6 before entering the inner cavity of the first oil outlet pipe 5-5; the outer surface of the first oil outlet pipe 5-5 is also provided with a moving track 5-5-1, which is located on the outer surface of the left boss at the left end of the first oil outlet pipe 5-5. The moving track 5-5-1 includes a horizontal track 5-5-1-1 and a circumferential track 5-5-2-2. The circumferential track 5-5-2-2 is arranged circumferentially along the outer surface of the boss, and the horizontal track 5-5-1-1 is axial and passes through the left boss of the first oil outlet pipe 5-5; the cross-section of the horizontal track 5-5-1-1 and the circumferential track 5-5-2-2 is hemispherical, which is used to cooperate with the movement of the limiting block 4-3-2 and the change in hydraulic pressure inside the translational limiting sleeve 4-4. The drive rotation limiting sleeve 4-3 moves axially. A circular through hole is provided on the left end face of the rotation limiting sleeve 4-3. A hemispherical limiting block 4-3-2 is circumferentially positioned at the opening. The rotation limiting sleeve 4-3 is slidably connected to the first oil outlet pipe 5-5 through the cooperation of the limiting block 4-3-2 and the horizontal track 5-5-1-1. The rotation limiting sleeve 4-3 is rotatably connected to the first oil outlet pipe 5-5 through the cooperation of the limiting block 4-3-2 and the circumferential track 5-5-2-2. During normal operation of the high-speed hydraulic rotary joint, the hydraulic pressure of the oil flowing through the translation limiting sleeve 4-4 is normal. The limiting block 4-3-2 of the rotation limiting sleeve 4-3 is located within the horizontal track 5-5-1-1, and the limiting pin 4-1-2 is located in the rotation limiting groove 4-3. Within -1, and the horizontal track 5-5-1-1 restricts the rotation of the rotation limit sleeve 4-3; due to the pressure inside the rotary joint 4-1 during the normal flow of oil, the rotary joint 4-1 with the fixed limit pin 4-1-2 has a tendency to move to the right. Since the limit pin 4-1-2 passes through the inclined translation limit groove 4-4-1, the translation limit groove 4-4-1 also restricts the rightward movement of the rotary joint 4-1, so that the left end of the rotary joint 4-1 cannot be separated from the right end of the first oil outlet pipe 5-5, thus ensuring the normal flow of oil; the left end of the translation limit sleeve 4-4 is coaxially provided with an oil pipe pressure holding unit 6, and the oil pipe pressure holding unit 6 is threadedly connected to the translation limit sleeve 4-4.

[0034] During operation, the oil at the input end enters the inner cavity of the pressure holding unit 6 through the threaded hole at the left end of the pressure holding unit 6. The pressure holding unit 6 includes a receiving chamber 6-4 disposed in the inner cavity. The receiving chamber 6-4 includes a mounting plate 6-3 distributed at the second oil outlet pipe 6-1 on the right end. The mounting plate 6-3 is coaxially fixed in the inner cavity of the oil pipe pressure holding unit 6. A first guide hole 6-8 is provided at the center of the mounting plate 6-3. A hollow boss 6-6 is fixed at the left end of the mounting plate 6-3. A second guide hole 6-9 is provided at the center of the left end face of the boss 6-6. A third return spring 6-5 is provided on the left end face of the inner cavity of the boss 6-6. The left end of the third return spring 6-5 is fixed to the left end face of the inner cavity of the boss 6-6. A circular ball valve 6-7 is fixedly connected to the right end of the third return spring 6-5. The ball valve 6-7 is in contact with the hole of the first guide 6-8. 7. The outer surface of the right end contacts the left end face of the first guide rod 8-4, which passes through the first guide hole 6-8; at this time, the third return spring 6-5 is in a compressed state, the ball valve 6-7 is located to the left of the first guide hole 6-8, and the oil enters the accommodating chamber 6-4 through the second guide hole 6-9 and flows out through the first guide hole 6-8 into the inner cavity of the translation limiting sleeve 4-4; a filter unit 5 is coaxially arranged in the inner cavity of the translation limiting sleeve 4-4; the filter structure 5-6 in the filter unit 5 includes a fixed frame 5-4 and an annular filter element 5-1. The middle part of the fixed frame 5-4 is a cylindrical structure, and several filter holes 5-4-2 are evenly distributed around the cylindrical structure. An annular filter element 5-1 is coaxially arranged on the outer side of the cylindrical structure. Filter element end caps 5-4-1 are respectively arranged at the left and right ends of the fixed frame 5-4. The cross-section of the filter element end caps 5-4-1 is U-shaped. The inner surface of the U-shaped opening and the outer surface of the cylindrical structure in the middle of the fixing frame 5-4 form a space for the annular filter element 5-1. The filter element end cap 5-4-1 at the left end of the filter structure 5-6 is fixedly connected to the diverter plate 5-2, and the filter element end cap 5-4-1 at the right end is fixedly connected to the first oil outlet pipe 5-5.The flow divider 5-2 is frustum-shaped, effectively and evenly diverting the oil flowing from the second oil outlet pipe 6-1 to the circumference of the flow divider 5-2. The flow divider 5-2 also has six sets of drainage holes 5-2-1 evenly arranged circumferentially. A circular one-way valve 5-3 is coaxially arranged on the right side. The one-way valve 5-3 has a frustum-shaped cross-section with a diameter equal to that of the flow divider 5-2. This prevents the oil in the inner cavity of the translational limiting sleeve 4-4 from flowing backwards into the pressure-holding unit 6 due to excessive pressure. During normal operation, the oil is diverted by the flow divider 5-2 and passes through the one-way valve 5-3 into the space formed by the outer surface of the annular filter element 5-1 and the inner cavity of the translational limiting sleeve 4-4. The oil passes through the annular filter element 5-1, causing solid impurities in the oil to be retained within the annular filter element 5-1. -1 Surface and interior, filtered oil flows through the filter hole 5-4-2 and the first oil outlet pipe 5-5 into the rotary joint 4-1, flowing towards the output end; a limiting step 4-1-1 is provided on the left side of the rotary joint 4-1. In this invention, in order to make the rotating limiting sleeve 4-3 move to the right under a certain critical pressure, a damping spring 4-2 is coaxially provided on the left side of the limiting step 4-1-1. The left end of the damping spring 4-2 is connected to the rotating limiting sleeve 4-3, and the right end is connected to the limiting step 4-1-1; during normal operation, the pressure of the oil in the cavity of the translation limiting sleeve 4-4 cannot compress the damping spring 4-2, the rotating limiting sleeve 4-3 is in the leftmost position, and the first oil outlet pipe 5-5 is tightly connected to the rotary joint 4-1.

[0035] In this invention, because the oil flowing through the high-speed hydraulic rotary joint contains certain solid impurities, during the repeated flow of the oil, more and more solid impurities accumulate on the surface and inside of the annular filter element 5-1, causing blockage of the filter holes 5-4-2. The oil accumulates in the space formed by the inner cavity of the translational limiting sleeve 4-4 and the left end face of the rotating limiting sleeve 4-3, preventing it from entering the first oil outlet pipe 5-5. The one-way valve 5-3 also prevents the oil from flowing back. The continuous increase in oil pressure drives the rotating limiting sleeve 4-3 to move to the right. When the oil pressure is greater than the elastic force of the damping spring 4-2, the damping spring 4- 2. Compression begins. The rotating limiting sleeve 4-3 moves to the right along the horizontal track 5-5-1-1 to the circumferential track 5-5-2-2 in the direction of compression of the damping spring 4-2. At this time, the rotating limiting sleeve 4-3, which has entered the circumferential track 5-5-2-2, is released from the rotation limit. Under the action of hydraulic pressure, the limiting pin 4-1-2 moves along the translation limiting groove 4-4-1. The angle formed by the inclined translation limiting groove 4-4-1 and the horizontal direction is an acute angle, which causes the rotary joint 4-1 to move to the right and rotate relative to the rotary oil outlet pipe 1, until the rotary joint 4-1 disengages from the first oil outlet pipe 5-5.

[0036] To ensure that the oil in the first oil outlet pipe 5-5 and the inner cavity of the rotary joint 4-1 are in a pressure-holding and sealed state after the first oil outlet pipe 5-5 is disengaged, a first pressure-stabilizing structure 8 is provided in the inner cavity of the first oil outlet pipe 5-5. The first pressure-stabilizing structure 8 includes a first plug 8-1, a first guide plate 8-3, a first return spring 8-2, and a first guide rod 8-4. The first guide plate 8-3 is coaxially fixed to the first oil outlet pipe 5-5 and has several oil guide holes. The first plug 8-1 is frustoconical and inserted into the conical hole at the right end of the inner cavity of the first oil outlet pipe 5-5. The left end of the first plug 8-1 is fixedly connected to the first guide rod 8-4. The first guide rod 8-4 is coaxially inserted through the first guide plate 8-3 into the inner cavity of the pressure-holding unit 6 and its left end contacts the right surface of the ball valve 6-7. -4 is slidably connected to the first guide plate 8-3; the inner cavity of the rotary joint 4-1 is a stepped circular hole, the left end of which is a conical hole, and a rotary joint 7 is coaxially arranged inside the stepped circular hole. The second pressure stabilizing structure 7 includes a second guide plate 7-3, a second return spring 7-2, and a second plug 7-1. The second guide plate 7-3 is coaxially arranged with the rotary joint 4-1 and fixedly connected to the inner cavity of the rotary joint 4-1. The second plug 7-1 is frustum-shaped and inserted into the conical hole at the left end of the inner cavity of the rotary joint 4-1. The right end of the second plug 7-1 is fixedly connected to the second guide rod 7-4. The second guide rod 7-4 is coaxially passed through the second guide plate 7-3 and slidably connected to the second guide plate 7-3. One end of the second return spring 7-2 is connected to the second plug 7-1, and the other end is connected to the second guide plate 7-3. During normal operation, the right end face of the first plug 8-1 contacts the left end face of the second plug 7-1, the first return spring 8-2 is in a compressed state, the first plug 8-1 moves to the left and releases the seal on the right end of the tapered hole in the inner cavity of the first oil outlet pipe 5-5, at which point the tapered hole is in an open state; the second return spring 7-2 connected to the second plug 7-1 is pushed to the right by the left end of the first plug 8-1 and is in a compressed state, the second plug 7-1 moves to the right and releases the seal on the left end of the tapered hole in the inner cavity of the rotary joint 4-1, at which point the tapered hole is in an open state, and the oil enters the rotary joint 4-1 along the first oil outlet pipe 5-5.

[0037] After the first oil outlet pipe 5-5 disengages from the rotary joint 4-1, the second return spring 7-2 in the second pressure stabilizing structure 7 loses its thrust and returns to its initial length. The second return spring 7-2 pushes the second plug 7-1 to the left to block the tapered hole at the left end of the inner cavity of the rotary joint 4-1, thus closing the tapered hole at the left end of the inner cavity of the rotary joint 4-1. At the same time, the first return spring 8-2 in the first pressure stabilizing structure 8 also loses its thrust and returns to its initial length. The first return spring 8-2 pushes the first plug 8-1 to the right to block the tapered hole at the right end of the inner cavity of the first oil outlet pipe 5-5, thus closing the tapered hole.

[0038] In this invention, after the first oil outlet pipe 5-5 is disconnected from the rotary joint 4-1, the filter unit 5 needs to be replaced; when the connection between the second oil outlet pipe 6-1 and the translation limit sleeve 4-4 in the pressure holding unit 6 is disconnected, the first guide hole 6-8 needs to be sealed. When the first oil outlet pipe 5-5 is disconnected from the rotary joint 4-1, the first return spring 8-2 in the first pressure stabilizing structure 8 pushes the first plug 8-1 to move to the right. The left end of the first plug 8-1 is coaxially fixedly connected to the first guide rod 8-4. The first guide rod 8-4 passes through the first guide plate 8-3 to the inner cavity of the pressure holding unit 6 and contacts the right surface of the ball valve 6-7. At this time, because the first guide rod 8-4 moves to the right, the third return spring 6-5 connected to the left end of the ball valve 6-7 returns to its initial length and seals with the first guide hole 6-8, so that the oil cannot flow out of the inner cavity of the pressure holding unit 6.

[0039] During the operation of the high-speed hydraulic rotary joint, the oil flows into the receiving chamber 6-4 through the second guide hole 6-9. Because the first guide rod 8-4 presses against the right side of the ball valve 6-7, the ball valve 6-7 is positioned to the left of the first guide hole 6-8. The oil then flows into the receiving chamber 6-4 through the second guide hole 6-9. From there, the oil flows to the second oil outlet pipe 6-1 and enters the translational limiting sleeve 4-4 connected to the right end of the second oil outlet pipe 6-1. The oil is then diverted by the flow divider 5-2 and evenly enters the space formed between the outer surface of the annular filter element 5-1 and the inner cavity of the translational limiting sleeve 4-4 through the guide hole 5-2-1. During normal operation, the oil enters the first oil outlet pipe 5-5 through the filter holes 5-4-2 on the outer surface of the annular filter element 5-1. The oil is under pressure, which acts on the right side of the rotating limit sleeve 4-3 inside the translational limit sleeve 4-4. The leftward elastic force of the damping spring 4-2 located inside the rotating limit sleeve 4-3 is greater than the pressure exerted by the oil on the right side of the rotating limit sleeve 4-3, thus maintaining the rotating limit sleeve 4-3 on the left side of the first oil outlet pipe 5-5. At this time, the limit block 4-3-2 on the rotating limit sleeve 4-3 is located on the horizontal track 5-5-1. On the left side, the relative rotation between the rotation limiting sleeve 4-3 and the first oil outlet pipe 5-5 is restricted. The limiting pin 4-1-2, located circumferentially on the rotary joint 4-1, is situated within the rotation limiting groove 4-3-1, restricting its circumferential rotation. Simultaneously, the limiting pin 4-1-2 passes through the rotation limiting groove 4-3-1. The rotation limiting groove 4-3-1, located circumferentially on the right end of the translation limiting sleeve 4-4, restricts the left and right movement of the limiting pin 4-1-2, thus confining it within the limiting space 4-5. The rotary joint 4-1-2 is fixed to the limiting pin 4-1-2. 1. It is tightly connected to the first oil outlet pipe 5-5; at the same time, the right end face of the first plug 8-1 set in the inner cavity of the first oil outlet pipe 5-5 is in close contact with the left end face of the second plug 7-1 set in the inner cavity of the rotary joint 4-1. The first plug 8-1 is pushed to the left and the seal on the tapered hole at the right end of the inner cavity of the first oil outlet pipe 5-5 is released. The second plug 7-1 is pushed to the right and the seal on the tapered hole at the left end of the inner cavity of the rotary joint 4-1 is released. The oil enters the rotary joint 4-1 through the first oil outlet pipe 5-5 and then reaches the rotary outlet pipe 1 through the rotary inlet pipe 3 to reach the designated output end device.

[0040] Because the oil flowing through the high-speed hydraulic rotary joint contains certain solid impurities, after these impurities accumulate to a certain amount, more and more solid impurities accumulate on the surface and inside of the annular filter element 5-1, causing blockage of the filter holes 5-4-2. The oil accumulates in the space formed by the inner cavity of the translational limiting sleeve 4-4 and the left end face of the rotating limiting sleeve 4-3, preventing it from entering the first oil outlet pipe 5-5. The one-way valve 5-3 also prevents the oil from flowing back. The continuous increase in oil pressure drives the rotating limiting sleeve 4-3 to move to the right. When the oil pressure exceeds the elastic force of the damping spring 4-2... When the damping spring 4-2 begins to compress, the rotating limiting sleeve 4-3 moves to the right along the horizontal track 5-5-1-1 to the circumferential track 5-5-2-2 in the direction of the damping spring compression. At this time, the rotating limiting sleeve 4-3, which has entered the circumferential track 5-5-2-2, is released from its rotational limitation. Under the action of hydraulic pressure, the limiting pin 4-1-2 moves along the translational limiting groove 4-4-1. The angle formed by the inclined translational limiting groove 4-4-1 and the horizontal direction is an acute angle, causing the rotary joint 4-1 to move to the right while rotating relative to the rotary oil outlet pipe 1. The head 4-1 is disengaged from the first oil outlet pipe 5-5; to ensure that the oil in the inner cavity of the first oil outlet pipe 5-5 and the rotary joint 4-1 is in a pressure-sealing state after the first oil outlet pipe 5-5 is disengaged from the rotary joint 4-1, the second return spring 7-2 in the second pressure stabilizing structure 7 loses its thrust and returns to its initial length. The second return spring 7-2 pushes the second plug 7-1 to the left to block the tapered hole at the left end of the inner cavity of the rotary joint 4-1, thus closing the tapered hole at the left end of the inner cavity of the rotary joint 4-1; at the same time, the first pressure stabilizing structure 8 The first return spring 8-2 simultaneously loses its thrust and returns to its initial length. The first return spring 8-2 pushes the first return spring 8-2 to the right to block the tapered hole at the right end of the inner cavity of the first oil outlet pipe 5-5, thus closing the tapered hole. After the first oil outlet pipe 5-5 is disengaged from the rotary joint 4-1, in order to facilitate the replacement of the filter unit 5, in this invention, the first guide rod 8-4 moves to the right so that the third return spring 6-5 connected to the left end of the ball valve 6-7 returns to its initial length and makes sealing contact with the first guide 6-8 hole, so that the oil cannot flow out of the inner cavity of the pressure holding unit 6.

Claims

1. A high-speed hydraulic rotary joint, comprising a rotary inlet pipe and a bearing coaxially arranged with the rotary inlet pipe; the right end of the rotary inlet pipe is fixedly connected to the left side of the outer ring of the bearing, and a rotary outlet pipe is coaxially fixed to the right side of the inner ring of the bearing; characterized in that: The left end of the rotary oil inlet pipe is coaxially equipped with a quick-release unit, which includes a rotary joint, a rotation limiting sleeve, and a translation limiting sleeve. The right end of the rotary joint is coaxially fixed to the rotary oil inlet pipe and its inner cavity is connected. A rotation limiting sleeve is fitted on the outer side of the left end of the rotary joint. A rotation limiting groove with an opening at the right end is formed axially on the cylindrical wall of the rotation limiting sleeve. A translation limiting sleeve is fitted on the outer side of the rotation limiting sleeve and is slidably connected to the rotation limiting sleeve. A translation limiting groove with an opening at the right end is formed circumferentially on the cylindrical wall of the translation limiting sleeve. A cylindrical limiting pin is radially arranged on the circumferential surface of the rotary joint. The limiting pin passes through the limiting space formed by the intersection of the rotation limiting groove and the translation limiting groove. A filter unit coaxial with the rotary joint is also provided in the inner cavity of the translation limiting sleeve on the left side of the rotary limiting sleeve. The filter unit includes a filter structure, a flow divider, and a first oil outlet pipe. A filter structure is fixedly connected to the left end of the first oil outlet pipe, which is inserted through the left end face of the rotating limiting sleeve and contacts the left end face of the rotary joint. The filter structure is coaxially arranged with the first oil outlet pipe. A flow divider plate is coaxially fixed to the left end of the filter structure. The flow divider plate is arranged inside the translation limiting sleeve and is fixedly connected with the translation limiting sleeve. A moving track is also provided on the outer surface of the first oil outlet pipe. The moving track is located on the outer surface of the left-side boss at the left end of the first oil outlet pipe. The pressure change inside the translation limiting sleeve drives the rotating limiting sleeve to move along the moving track. When the rotating limiting sleeve is located on the left side of the moving track, the rotating limiting sleeve and the translation limiting sleeve are slidably connected in the left and right directions. When the rotating limiting sleeve is located on the right side of the moving track, the rotating limiting sleeve and the translation limiting sleeve rotate relative to each other. An oil pipe pressure holding device is coaxially arranged with the left end of the translation limiting sleeve. The oil pipe pressure holding device is connected to the translation limiting sleeve by threads.

2. A high speed hydraulic rotary union according to claim 1, characterized in that: The rotary joint has a stepped circular hole in its inner cavity, with a tapered hole at the left end. A second pressure stabilizing structure is coaxially arranged inside the stepped circular hole. The second pressure stabilizing structure includes a second guide plate, a second return spring, and a second plug. The second guide plate is coaxially arranged with the rotary joint and fixedly connected to the inner cavity of the rotary joint. The second plug is frustum-shaped and inserted into the tapered hole at the left end of the inner cavity of the rotary joint. The right end of the second plug is fixedly connected to the second guide rod. The second guide rod is coaxially inserted through the second guide plate and slidably connected to the second guide plate. One end of the second return spring is connected to the second plug, and the other end is connected to the second guide plate.

3. A high speed hydraulic rotary union according to claim 2, wherein: The first pressure stabilizing structure includes a first plug, a first guide plate, a first reset spring, and a first guide rod. The first guide plate is coaxially fixed with the first oil outlet pipe, and several oil guide holes are opened on the first guide plate. The first plug is truncated and inserted into the tapered hole at the right end of the inner cavity of the first oil outlet pipe. The left end of the first plug is fixedly connected to the first guide rod. The first guide rod is coaxially inserted through the first guide plate to the inner cavity of the pressure holding unit, and its left end contacts the right surface of the ball valve. The first guide rod is slidably connected to the first guide plate.

4. A high speed hydraulic rotary union according to claim 3, wherein: The pressure-holding unit includes a accommodating chamber disposed within the inner cavity. The accommodating chamber includes a mounting plate distributed at the second oil outlet pipe on the right end. The mounting plate is coaxially fixedly disposed within the inner cavity of the pressure-holding unit. A first guide hole is disposed at the center of the mounting plate. A hollow boss is fixed at the left end of the mounting plate. A second guide hole is disposed at the center of the left end face of the boss. A third return spring is disposed on the left end face of the inner cavity of the boss. The left end of the third return spring is fixed to the left end face of the inner cavity of the boss. A circular ball valve is fixedly connected to the right end of the third return spring. The ball valve is in contact with the first guide hole. The outer surface of the right end of the ball valve is in contact with the left end face of the second guide rod passing through the first guide hole.

5. A high speed hydraulic rotary union as defined in claim 1, wherein: The filter structure includes a fixed frame and an annular filter element. The fixed frame has a cylindrical structure in the middle, with several filter holes evenly distributed around the cylindrical wall. An annular filter element is coaxially arranged on the outer side of the cylindrical structure. Filter element end caps are respectively provided at the left and right ends of the fixed frame. The cross-section of the filter element end cap is U-shaped. The inner surface of the U-shaped opening and the outer surface of the cylindrical structure in the middle of the fixed frame form a space for accommodating the annular filter element. The filter element end cap at the left end of the filter structure is fixedly connected to a flow divider plate, and the filter element end cap at the right end is fixedly connected to the first oil outlet pipe.

6. A high speed hydraulic rotary union according to claim 1, characterized in that: The manifold is shaped like a frustum, which effectively and evenly distributes the oil flowing from the second oil outlet pipe to the circumference of the manifold. The manifold is also evenly provided with a set of drainage holes along the circumference, and a circular one-way valve is coaxially arranged on the right side. The one-way valve has a frustum-shaped cross-section and a diameter equal to that of the manifold.

7. A high-speed hydraulic rotary joint according to claim 1, characterized in that: The rotating limiting sleeve has a circular through hole on its left end face, and a hemispherical limiting block is provided around the hole in the circumferential direction.

8. A high speed hydraulic rotary union according to claim 7, characterized in that: The moving track is provided on the outer surface of the left boss of the first oil outlet pipe, including a horizontal track and a circumferential track. The circumferential track is arranged circumferentially along the outer surface of the boss, and the horizontal track is axial and passes through the left boss of the first oil outlet pipe. The cross-sections of the horizontal track and the circumferential track are hemispherical, which are used to cooperate with the movement of the limiting block. When the rotating limiting sleeve is located in the horizontal track of the moving track, the rotating limiting sleeve and the translational limiting sleeve are slidably connected in the left and right directions. When the rotating limiting sleeve is located in the circumferential track of the moving track, the rotating limiting sleeve and the horizontal translational limiting sleeve can rotate relative to each other.

9. A high speed hydraulic rotary union according to claim 3, wherein: The right end face of the first plug is attached to the left end face of the second plug.

10. A high speed hydraulic rotary union according to claim 1, characterized in that: The angle formed by the translational limiting groove and the rotational limiting groove is an acute angle.

Images