A high sealing rotary joint

Abstract

This utility model relates to the field of rotary joint technology, specifically to a high-sealing rotary joint, comprising: a fixed shell, a rotating shaft tube rotatably connected to the inner wall of the fixed shell, an airtight groove formed on the inner wall of the fixed shell, and a sealing gasket fixedly connected to the outer wall of the rotating shaft tube. The sealing gasket is made of a modified material with added permanent magnet powder. This utility model includes a detection component inside the sealing gasket. When the diameter of the sealing gasket decreases due to wear, the circumference of the strain gauge increases under the elastic action of the sealing gasket. The resistance of the strain gauge changes with stretching. According to the principle of strain effect, when the strain gauge is stretched, its length increases and its cross-sectional area decreases. According to the law of resistance, the resistance of the strain gauge increases, and the current through the strain gauge decreases. After the PLC controller detects the current change, it increases the current flowing into the electromagnetic coil. The magnetic field strength generated by the electromagnetic coil is proportional to the current flowing into the coil, according to Ampere's law.

Description

Technical Field

[0001] This utility model relates to the field of rotary joint technology, and specifically to a high-sealing rotary joint. Background Technology

[0002] A rotary joint is a device used to connect relatively rotating equipment components, enabling the transmission of fluids (such as liquids and gases) while rotating. A rotary joint typically consists of a housing, a rotating shaft, and seals. The housing primarily serves to fix and protect the internal components; it is generally stationary and installed on fixed equipment or pipelines. The rotating shaft connects to the rotating component and rotates with the equipment. The seals are the key components of the rotary joint; their function is to prevent fluid leakage and ensure stable fluid transmission from the stationary part to the rotating part during rotation. Therefore, the sealing performance of the rotary joint is crucial. For example, a high-sealing rotary joint disclosed in application number CN201410395636.0 is designed with improved sealing performance in mind.

[0003] Existing high-sealing rotary joints typically use a spring to compress a compression plate, which in turn compresses the seal. Although the spring force ensures a tight contact between the compression plate and the seal, thus achieving a sealing effect, the seal rotates with the rotating shaft (this is existing technology). As a result, strong friction occurs between the seal and the compression plate, which accelerates the wear of the seal. Once the seal wears out, its sealing performance decreases, and it requires frequent replacement. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a high-sealing rotary joint, which can effectively solve the problems of rapid wear of the sealing components, decreased sealing performance and frequent replacement required by the existing technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a high-sealing rotary joint, comprising:

[0007] A fixed shell, wherein a rotating shaft tube is rotatably connected to the inner wall of the fixed shell, an airtight groove is provided on the inner wall of the fixed shell, and a sealing gasket is fixedly connected to the outer wall of the rotating shaft tube, wherein the sealing gasket is made of a material modified with the addition of permanent magnet powder.

[0008] An adaptive sealing adjustment mechanism is provided, which is disposed inside a fixed housing. The inner wall of the fixed housing is provided with a placement groove, and the placement groove and the airtight groove are at the same level. An electromagnetic coil is fixedly disposed inside the placement groove. The adaptive sealing adjustment mechanism also includes a detection component for detecting the sealing performance.

[0009] The lubrication adding mechanism is set inside a fixed shell. The fixed shell has two lubrication chambers, upper and lower, for storing lubricating fluid. Each lubrication chamber has a pressure ring for squeezing the lubricating fluid, which is airtightly slidably installed inside the lubrication chamber. The lubrication chamber and the airtight groove share a liquid inlet, and a pressure valve is installed inside the liquid inlet.

[0010] Preferably, the detection assembly further includes a detection cavity opened inside the sealing gasket. A fixing ring is fixedly connected to the inner wall of the detection cavity. A plurality of fixing rods are fixedly connected to the inner circumferential wall of the fixing ring in a fixed circumferential array. The other end of the fixing rod passes through the sealing gasket and is fixedly connected to the rotating shaft tube. A strain ring is fixedly sleeved on the outer circumferential wall of the fixing ring. The outer circumferential wall of the strain ring is fixedly connected to the inner circumferential wall of the detection cavity. The strain ring and the electromagnetic coil are electrically connected to a PLC controller to form an adjustment circuit. The electromagnetic coil and the sealing gasket are magnetically attracted to each other.

[0011] Preferably, the lubrication adding mechanism further includes an electromagnetic ring fixedly connected to the inner wall of the two lubrication chambers on the side away from the sealing gasket, a plastic spring fixedly connected to the outer wall of the electromagnetic ring, and a permanent magnet ring that repels the magnetism of the electromagnetic ring fixedly connected to the other end of the plastic spring. The outer wall of the permanent magnet ring is fixedly connected to the extrusion ring, and the extrusion ring has magnetic shielding.

[0012] Preferably, the inner peripheral wall of the fixed shell is fixedly connected with an annular groove, and the bottom end of the annular groove is airtightly rotatably connected to the top end of the rotating shaft tube. An infrared transmitter and an infrared receiver with corresponding positions are fixedly connected to the inner peripheral wall of the annular groove. A blocking rod is fixedly connected to the top end of the rotating shaft tube, and the blocking rod passes between the infrared transmitter and the infrared receiver during the movement. The infrared transmitter, the infrared receiver, the electromagnetic ring and the PLC controller are electrically connected to form a lubrication circuit.

[0013] Preferably, it further includes a cooling mechanism, which includes a plurality of negative temperature coefficient thermistors fixedly connected to one side of the two lubrication chambers near the sealing gasket. The outer wall of the negative temperature coefficient thermistors is fitted with a protective cover. The inner wall of the rotating shaft tube is embedded with a temperature-conducting ring, which extends into the interior of the rotating shaft tube. The outer peripheral wall of the temperature-conducting ring is fixedly connected to the inner peripheral wall of the sealing gasket. The negative temperature coefficient thermistors are electrically connected to the temperature-conducting ring to form a cooling circuit.

[0014] Preferably, the interior of the fixed shell has two symmetrical extrusion grooves that communicate with the airtight groove. Multiple electromagnetic telescopic rods are fixedly connected to the inner wall of the extrusion groove away from the sealing gasket. The telescopic end of the electromagnetic telescopic rod is fixedly connected to an extrusion sealing ring that is airtightly slidably connected to the inner peripheral wall of the extrusion groove. The sides of the two extrusion sealing rings that are close to each other are in contact with the sealing gasket.

[0015] Preferably, a plurality of porous varistors are embedded on the side of the extrusion sealing ring that contacts the sealing gasket. The porous varistors, the electromagnetic telescopic rod, and the PLC controller are electrically connected to form an extrusion circuit.

[0016] Preferably, the outer wall of the fixed shell has a replenishment port that communicates with two lubrication chambers respectively, and the inner wall of the replenishment port is provided with a sealing plug.

[0017] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0018] This invention incorporates a detection component inside the sealing gasket. When the diameter of the sealing gasket decreases due to wear, the circumference of the strain gauge increases under the elastic action of the gasket. The resistance of the strain gauge changes with stretching. According to the principle of strain effect, when the strain gauge is stretched, its length increases and its cross-sectional area decreases. According to the law of resistance, the resistance of the strain gauge increases, and the current through the strain gauge decreases. After the PLC controller detects the current change, it increases the current flowing into the electromagnetic coil. The magnetic field strength generated by the electromagnetic coil is proportional to the current flowing into the coil. According to Ampere's law, under the condition that other conditions such as the number of turns remain unchanged, this further increases the magnetic attraction force on the sealing gasket, making the outer peripheral wall of the sealing gasket in close contact with the inner peripheral wall of the airtight groove. Simultaneously, when the sealing gasket becomes thinner, and the squeezing force of the porous structure varistor on the sealing gasket is insufficient, the resistance of the porous structure varistor decreases. After the PLC controller detects the current change, it increases the current flowing into the electromagnetic telescopic rod, causing the electromagnetic telescopic rod to push the squeezing sealing ring to continue squeezing the sealing gasket, maintaining good sealing performance.

[0019] The rotating shaft drives the blocking rod to rotate in the annular groove. Each rotation blocks the infrared light emitted by the infrared transmitter, preventing the infrared receiver from receiving the infrared light. The PLC controller calculates the rotation speed of the rotating shaft based on this. When the lubricant is insufficient, the rotation speed of the rotating shaft decreases due to increased friction. Pre-testing shows that when the rotation speed is reached, more lubricant needs to be added. The PLC controller increases the current supplied to the electromagnetic ring, which generates a repulsive force on the permanent magnet ring, causing the permanent magnet ring to push the extrusion ring to squeeze the lubricant. The lubricant is squeezed out to the top and bottom of the sealing gasket. The rotation of the sealing gasket allows the lubricant to spread evenly, effectively reducing the friction between the sealing gasket and the airtight groove and the extrusion sealing ring, thereby reducing the wear of the sealing gasket.

[0020] Because the friction between the gasket, the airtight groove, and the squeezed sealing ring causes the temperature to gradually increase, the negative temperature coefficient thermistor detects the temperature rise and its resistance changes, thereby increasing the current flowing into the temperature-conducting ring. The temperature-conducting ring, made of solid conductive polymer, has increased thermal conductivity after being energized. The fluid transmitted through the rotating shaft tube cools the temperature-conducting ring, thereby achieving the effect of cooling the gasket and preventing excessive temperature from causing adverse effects on the gasket and other components. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a top view of the three-dimensional cross-sectional structure of the present invention.

[0024] Figure 3 This is a side view of the three-dimensional structure of the present invention. Figure 1 ;

[0025] Figure 4 This is a side view of the three-dimensional structure of the present invention. Figure 2 ;

[0026] Figure 5 This is a cross-sectional three-dimensional structural diagram of the present invention. Figure 1 ;

[0027] Figure 6 This is a cross-sectional three-dimensional structural diagram of the present invention. Figure 2 ;

[0028] Figure 7 This is a cross-sectional three-dimensional structural diagram of the present invention. Figure 3 ;

[0029] Figure 8 This utility model Figure 2 Enlarged view of section A in the middle;

[0030] Figure 9 This utility model Figure 5 Enlarged view of section B;

[0031] Figure 10 This is a three-dimensional structural diagram of the extrusion sealing ring of this utility model.

[0032] Reference numerals: 1. Fixed shell; 2. Rotating shaft tube; 3. Airtight groove; 4. Sealing gasket; 5. Adaptive sealing adjustment mechanism; 51. Placement groove; 52. Electromagnetic coil; 53. Detection component; 531. Detection chamber; 532. Fixed ring; 533. Fixed rod; 534. Strain gauge ring; 6. Lubrication addition mechanism; 61. Lubrication chamber; 62. Extrusion ring; 63. Liquid inlet; 64. Electromagnetic ring; 65. Plastic spring; 66. Permanent magnet ring; 67. Circular groove; 68. Infrared emitter; 69. Infrared receiver; 610. Shielding rod; 7. Cooling mechanism; 71. Negative temperature coefficient thermistor; 72. Protective cover; 73. Temperature-conducting ring; 8. Extrusion groove; 9. Electromagnetic telescopic rod; 10. Extrusion sealing ring; 11. Porous structure varistor. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Example: Refer to Figures 1 to 10 A high-sealing rotary joint, comprising:

[0036] A fixed shell 1 is rotatably connected to a rotating shaft tube 2 on its inner wall. An airtight groove 3 is provided on the inner wall of the fixed shell 1. A sealing gasket 4 is fixedly connected to the outer wall of the rotating shaft tube 2. The sealing gasket 4 is made of a material modified with the addition of permanent magnet powder and has a certain degree of elasticity.

[0037] The sealing performance is adaptively adjusted by the adaptive sealing adjustment mechanism 5, referring to... Figure 6 , Figure 7 The adaptive sealing adjustment mechanism 5 is set inside the fixed shell 1. The inner wall of the fixed shell 1 is provided with a placement groove 51, and the placement groove 51 is at the same level as the airtight groove 3. An electromagnetic coil 52 is fixedly installed inside the placement groove 51. The adaptive sealing adjustment mechanism 5 also includes a detection component 53 for detecting the sealing performance.

[0038] When the electromagnetic coil 52 is energized, it generates an external magnetic field. This external magnetic field will affect the molecular current in the material, causing the orientation of the molecular current to tend to be consistent ("orientation" refers to the direction of the molecular current, which determines the direction of the magnetic field it generates). Just like a small compass needle will deflect in a magnetic field, the magnetic fields generated by these molecular currents with consistent orientation are superimposed, thus making the electromagnetic coil 52 exhibit magnetism.

[0039] The sealing performance of the sealing gasket 4 is monitored in real time through the following specific structure, refer to... Figure 7 The detection assembly 53 also includes a detection cavity 531 opened inside the sealing gasket 4. A fixing ring 532 is fixedly connected to the inner wall of the detection cavity 531. A plurality of fixing rods 533 are fixedly connected to the inner circumferential wall of the fixing ring 532 in a fixed circumferential array. The other end of the fixing rods 533 passes through the sealing gasket 4 and is fixedly connected to the rotating shaft tube 2. A strain ring 534 is fixedly sleeved on the outer circumferential wall of the fixing ring 532. The outer circumferential wall of the strain ring 534 is fixedly connected to the inner circumferential wall of the detection cavity 531. The strain ring 534 and the electromagnetic coil 52 are electrically connected to a PLC controller and form an adjustment circuit. The electromagnetic coil 52 and the sealing gasket 4 are magnetically attracted to each other.

[0040] The direction of the magnetic field of the electromagnetic coil 52 is determined by using Ampere's law. The direction of the magnetic poles is ensured to be correct by changing the winding direction of the coil or the direction of the current, so that the magnetic poles generated by the electromagnetic coil 52 attract each other with the magnetic poles of the sealing gasket 4.

[0041] Lubricant is added around the sealing gasket 4 via the lubrication addition mechanism 6, as per [reference]. Figure 2 , Figure 3 , Figure 8 The lubrication adding mechanism 6 is set inside the fixed shell 1. The fixed shell 1 is provided with two lubrication chambers 61 for storing lubricating fluid. The lubrication chamber 61 is airtightly slidably provided with a squeezing ring 62 for squeezing the lubricating fluid. The lubrication chamber 61 and the airtight groove 3 are provided with a liquid inlet 63, and a pressure valve is provided in the liquid inlet 63.

[0042] The lubrication adding mechanism 6 also includes an electromagnetic ring 64 fixedly connected to the inner wall of the two lubrication chambers 61 on the side away from the sealing gasket 4, a plastic spring 65 fixedly connected to the outer wall of the electromagnetic ring 64, and a permanent magnet ring 66 fixedly connected to the other end of the plastic spring 65, which is magnetically repelled by the electromagnetic ring 64. The outer wall of the permanent magnet ring 66 is fixedly connected to the extrusion ring 62, and the extrusion ring 62 has magnetic shielding.

[0043] A circular groove 67 is fixedly connected to the inner peripheral wall of the fixed shell 1, and the bottom end of the circular groove 67 is airtightly rotatably connected to the top end of the rotating shaft tube 2. An infrared transmitter 68 and an infrared receiver 69 with corresponding positions are fixedly connected to the inner peripheral wall of the circular groove 67. A blocking rod 610 is fixedly connected to the top end of the rotating shaft tube 2, and the blocking rod 610 passes between the infrared transmitter 68 and the infrared receiver 69 during the movement. The infrared transmitter 68, the infrared receiver 69, the electromagnetic ring 64 are electrically connected to the PLC controller and form a lubrication circuit.

[0044] The temperature of the sealing gasket 4 is controlled by the cooling mechanism 7, referring to... Figures 2 to 5 The cooling mechanism 7 includes multiple negative temperature coefficient thermistors 71 fixedly connected to one side of the two lubrication chambers 61 near the sealing gasket 4. The outer wall of the negative temperature coefficient thermistors 71 is fitted with a protective cover 72. The inner wall of the rotating shaft tube 2 is embedded with a temperature conducting ring 73, and the temperature conducting ring 73 extends into the interior of the rotating shaft tube 2. The outer peripheral wall of the temperature conducting ring 73 is fixedly connected to the inner peripheral wall of the sealing gasket 4. The negative temperature coefficient thermistors 71 and the temperature conducting ring 73 are electrically connected to form a cooling circuit.

[0045] As the temperature increases, the carrier concentration in the semiconductor material of the negative temperature coefficient thermistor 71 increases, and the carrier mobility also increases, thereby reducing the resistance value.

[0046] The thermal conductive ring 73 is made of a solid conductive polymer. Solid conductive polymers typically exhibit increased thermal conductivity after being energized, and their thermal conductivity increases with increasing current. However, their thermal conductivity is relatively poor when no current is applied. The reasons for this are as follows:

[0047] Unlike metals, which rely on free electrons, and inorganic non-metals, which rely on phonons for heat conduction, ordinary polymers have disordered molecular chains with weak interactions, making them difficult to effectively transfer heat. They have low thermal conductivity and are poor conductors of heat, such as common plastics and rubber. When solid conductive polymers are not energized, they have few charge carriers with low mobility, contributing little to heat transfer. Heat conduction mainly relies on the movement of molecular chain segments and nodes, but the transfer effect is poor, resulting in poor thermal conductivity.

[0048] When an electric current is passed through a solid conductive polymer, more charge carriers are activated and their migration speed increases with the increase of the current. During their movement, the charge carriers collide with surrounding molecules or ions, transferring heat. At the same time, the increase in current leads to the Joule heating effect, which raises the internal temperature of the polymer. The increased temperature further enhances the thermal motion of molecules, making the movement of molecular chain segments and units more active, and may also excite more charge carriers. These factors combined result in the thermal conductivity of the solid conductive polymer increasing with the increase of the current.

[0049] The sealing gasket 4 is further sealed through the following specific structure, as shown in the reference. Figure 9 , Figure 10The interior of the fixed shell 1 has two symmetrical extrusion grooves 8 that communicate with the airtight groove 3. Multiple electromagnetic telescopic rods 9 are fixedly connected to the inner wall of the extrusion grooves 8 away from the sealing gasket 4. The telescopic ends of the electromagnetic telescopic rods 9 are fixedly connected to extrusion sealing rings 10 that are airtightly slidably connected to the inner circumferential wall of the extrusion grooves 8. The sides of the two extrusion sealing rings 10 that are close to each other are in contact with the sealing gasket 4. Multiple porous varistors 11 are embedded on the side of the extrusion sealing rings 10 that are in contact with the sealing gasket 4. The porous varistors 11, the electromagnetic telescopic rods 9 and the PLC controller are electrically connected to form an extrusion circuit. The porous varistors 11 are varistors with porous microstructures. When the pressure decreases, the flow and distribution of the medium in the pores change, which reduces their resistance, such as metal oxide porous varistors.

[0050] The outer wall of the fixed shell 1 has a replenishment port that communicates with two lubrication chambers 61 respectively. The inner wall of the replenishment port is equipped with a sealing plug, and lubricant is replenished through the replenishment port.

[0051] The working principle of this utility model is as follows:

[0052] Before using the rotary joint, the electromagnetic coil 52 is energized first. The electromagnetic coil 52 attracts the outer peripheral wall of the sealing gasket 4. Since the sealing gasket 4 is elastic, the outer peripheral wall of the sealing gasket 4 can be in close contact with the inner peripheral wall of the airtight groove 3, thereby achieving a sealing effect. The operator then energizes the electromagnetic telescopic rod 9, which pushes the compression sealing ring 10 to compress the sealing gasket 4, further achieving a sealing effect.

[0053] As the rotating shaft tube 2 rotates, it will drive the sealing gasket 4 to rotate, which will cause friction between the sealing gasket 4 and the airtight groove 3 and the squeeze sealing ring 10, causing the sealing gasket 4 to gradually become thinner and its diameter to gradually become smaller.

[0054] As the sealing ring begins to wear, its diameter gradually decreases, and the sealing gap tends to increase. At this time, the inner circumferential wall of the strain ring 534 is fixedly connected by the fixing ring 532, while the outer circumferential wall is fixedly connected to the inner wall of the sealing gasket 4. Therefore, under the elastic action of the sealing gasket 4, the strain ring 534 will be pulled outward. The resistance of the strain ring 534 will change with strain (tension or compression). According to the principle of strain effect, when the strain ring 534 is stretched, its length increases and its cross-sectional area decreases. According to the resistance law (where is the resistivity), the resistance of the strain ring 534 will increase. The current in the strain gauge 534 decreases, and then the PLC controller detects the current through the strain gauge 534. The PLC controller then increases the current flowing into the electromagnetic coil 52. The current flowing into the electromagnetic coil 52 is inversely proportional to the current flowing into the strain gauge. By increasing the current flowing into the electromagnetic coil 52, the magnetic attraction force on the sealing gasket 4 is further increased (according to Ampere's law, for an electromagnetic coil 52, the magnetic field strength it generates is proportional to the current flowing into the coil, provided that other conditions such as the number of turns remain unchanged), thereby achieving the effect of adaptively adjusting the seal.

[0055] Meanwhile, when the sealing gasket 4 becomes thinner, the squeezing sealing ring 10 causes insufficient squeezing force on the sealing gasket 4 by the porous structure varistor 11, resulting in insufficient sealing. At this time, the resistance of the porous structure varistor 11 will decrease. Therefore, the PLC controller detects the current through the porous structure varistor 11 and increases the current flowing into the electromagnetic telescopic rod 9 (the current through the porous structure varistor 11 is proportional to the current flowing into the electromagnetic telescopic rod 9). This causes the electromagnetic telescopic rod 9 to push the squeezing sealing ring 10 to continue squeezing the sealing gasket 4. When the resistance value of the porous structure varistor 11 recovers, the current flowing into the electromagnetic telescopic rod 9 will be maintained (neither increasing nor decreasing).

[0056] Meanwhile, since the friction between the sealing gasket 4 and the airtight groove 3 and the compression sealing ring 10 will gradually consume the lubricant, it is necessary to monitor the consumption of lubricant in real time and replenish it in time.

[0057] The rotating shaft tube 2 drives the blocking rod 610 to rotate in the annular groove 67. Each rotation of the blocking rod 610 blocks the infrared light emitted by the infrared transmitter 68 once, so the infrared receiver 69 will not receive the infrared light at this moment. Then, the PLC controller calculates the rotation speed of the rotating shaft tube 2. When the lubricant is insufficient, the rotation speed of the rotating shaft tube 2 will decrease due to the increased friction (pre-testing shows that when the rotation speed reaches the preset value x, the lubricant needs to be added). Then, the PLC controller increases the current flowing into the electromagnetic ring 64 (this current is determined based on the actual rotation speed of the rotating shaft tube 2). Therefore, the electromagnetic ring 64 generates a magnetic repulsion force on the permanent magnet ring 66, causing the permanent magnet ring 66 to push the extrusion ring 62 to squeeze the lubricant, thereby squeezing the lubricant to the upper and lower parts of the sealing gasket 4. Through the rotation of the sealing gasket 4, the lubricant is fully diffused on the sealing gasket 4 to achieve the effect of lubricant replenishment.

[0058] Meanwhile, the temperature gradually increases due to friction between the sealing gasket 4, the airtight groove 3, and the compression sealing ring 10. Therefore, the temperature is detected by the negative temperature coefficient thermistor 71. When the negative temperature coefficient thermistor 71 detects the temperature increase, it changes its resistance value, thereby increasing the current flowing into the temperature conducting ring 73, which in turn increases the thermal conductivity of the temperature conducting ring 73. Thus, the fluid transmitted through the rotating shaft tube 2 cools the temperature conducting ring 73, thereby achieving the effect of cooling the sealing gasket 4.

[0059] It should be noted that the temperature-conducting ring 73 can only be used when conveying fluids at normal or low temperatures.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-sealing rotary joint, characterized in that, include: A fixed shell (1) is rotatably connected to a rotating shaft tube (2) on the inner wall of the fixed shell (1). An airtight groove (3) is opened on the inner wall of the fixed shell (1). A sealing gasket (4) is fixedly connected to the outer wall of the rotating shaft tube (2). The sealing gasket (4) is made of a material modified with permanent magnet powder. An adaptive sealing adjustment mechanism (5) is provided inside a fixed shell (1). The inner wall of the fixed shell (1) is provided with a placement groove (51), and the placement groove (51) and the airtight groove (3) are on the same horizontal plane. An electromagnetic coil (52) is fixedly provided inside the placement groove (51). The adaptive sealing adjustment mechanism (5) also includes a detection component (53) for detecting the sealing performance. The lubrication adding mechanism (6) is set inside the fixed shell (1). The fixed shell (1) is provided with two lubrication chambers (61) for storing lubricating fluid. The lubrication chamber (61) is provided with an airtight sliding extrusion ring (62) for extruding the lubricating fluid. The lubrication chamber (61) and the airtight groove (3) are provided with a liquid inlet (63), and a pressure valve is provided in the liquid inlet (63).

2. The high-sealing rotary joint according to claim 1, characterized in that, The detection assembly (53) also includes a detection cavity (531) opened inside the sealing gasket (4). A fixing ring (532) is fixedly connected to the inner wall of the detection cavity (531). A plurality of fixing rods (533) are fixedly connected to the inner circumferential wall of the fixing ring (532). The other end of the fixing rod (533) passes through the sealing gasket (4) and is fixedly connected to the rotating shaft tube (2). A strain ring (534) is fixedly sleeved on the outer circumferential wall of the fixing ring (532). The outer circumferential wall of the strain ring (534) is fixedly connected to the inner circumferential wall of the detection cavity (531). The strain ring (534) is electrically connected to the electromagnetic coil (52) and a PLC controller to form an adjustment circuit. The electromagnetic coil (52) is magnetically attracted to the sealing gasket (4).

3. A high-sealing rotary joint according to claim 1, characterized in that, The lubrication adding mechanism (6) further includes an electromagnetic ring (64) fixedly connected to the inner wall of the two lubrication chambers (61) on the side away from the sealing gasket (4), a plastic spring (65) fixedly connected to the outer wall of the electromagnetic ring (64), and a permanent magnet ring (66) that is magnetically repulsive to the electromagnetic ring (64) fixedly connected to the other end of the plastic spring (65). The outer wall of the permanent magnet ring (66) is fixedly connected to the extrusion ring (62), and the extrusion ring (62) has magnetic shielding.

4. A high-sealing rotary joint according to claim 3, characterized in that, The inner circumferential wall of the fixed shell (1) is fixedly connected with an annular groove (67), and the bottom end of the annular groove (67) is airtightly rotatably connected to the top end of the rotating shaft tube (2). The inner circumferential wall of the annular groove (67) is fixedly connected with an infrared transmitter (68) and an infrared receiver (69) corresponding to the position. The top end of the rotating shaft tube (2) is fixedly connected with a shielding rod (610), and the shielding rod (610) passes between the infrared transmitter (68) and the infrared receiver (69) during the movement. The infrared transmitter (68), the infrared receiver (69), the electromagnetic ring (64) are electrically connected to the PLC controller and form a lubrication circuit.

5. A high-sealing rotary joint according to claim 1, characterized in that, It also includes a cooling mechanism (7), which includes multiple negative temperature coefficient thermistors (71) fixedly connected to the side of the two lubrication chambers (61) near the sealing gasket (4). The outer wall of the negative temperature coefficient thermistors (71) is fitted with a protective cover (72). The inner wall of the rotating shaft tube (2) is embedded with a temperature-conducting ring (73), and the temperature-conducting ring (73) extends into the interior of the rotating shaft tube (2). The outer peripheral wall of the temperature-conducting ring (73) is fixedly connected to the inner peripheral wall of the sealing gasket (4). The negative temperature coefficient thermistors (71) are electrically connected to the temperature-conducting ring (73) to form a cooling circuit.

6. A high-sealing rotary joint according to claim 1, characterized in that, The fixed shell (1) has two symmetrical extrusion grooves (8) that communicate with the airtight groove (3). Multiple electromagnetic telescopic rods (9) are fixedly connected to the inner wall of the extrusion groove (8) away from the sealing gasket (4). The telescopic end of the electromagnetic telescopic rod (9) is fixedly connected to an extrusion sealing ring (10) that is airtightly slidably connected to the inner circumferential wall of the extrusion groove (8). The two extrusion sealing rings (10) are in contact with the sealing gasket (4) on their sides that are close to each other.

7. A high-sealing rotary joint according to claim 6, characterized in that, On the side of the compression sealing ring (10) that contacts the sealing gasket (4), multiple porous structure varistors (11) are embedded. The porous structure varistors (11), the electromagnetic telescopic rod (9) are electrically connected to the PLC controller to form a compression circuit.

8. A high-sealing rotary joint according to claim 3, characterized in that, The outer wall of the fixed shell (1) is provided with a replenishment port that communicates with two lubrication chambers (61) respectively, and the inner wall of the replenishment port is provided with a sealing plug.

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