Hydraulic nut

Abstract

The invention discloses a hydraulic nut, and relates to the technical field of fan hub installation, and the hydraulic nut comprises a nut body, an oil injection port, an installation seat and a sealing pressing mechanism. The oil injection port and the installation base are arranged on the nut body. The sealing and pressing mechanism comprises a driving rod, a pressing piece, a stirring piece, a stirring cylinder and a plugging piece. The driving rod is rotationally connected to the mounting base, the pressing piece is in threaded connection with the driving rod, the shifting piece is fixedly connected to the pressing piece, the shifting cylinder is rotationally connected to the mounting base, and the plugging piece is fixedly connected to the shifting cylinder. A stirring groove is formed in the peripheral side surface of the stirring cylinder, and the stirring piece is in sliding fit with the stirring groove. According to the scheme, pollutants can be prevented from falling into the oil cavity of the hydraulic nut through the oil injection port, and the insertion depth of the injection nozzle in the oil injection port can be increased.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fan hub disc installation, in particular to a hydraulic nut. BACKGROUND

[0002] At present, the hub disc and the main shaft of the adjustable blade axial flow fan are conical connection, and the main shaft is provided with an annular diffuser oil groove. When the hub disc is installed, the hub disc needs to be pushed along the axial direction by a certain distance by means of the hydraulic nut, so as to ensure a certain interference between the hub disc and the main shaft, so that the hub disc and the main shaft will not slip during the operation of the fan equipment.

[0003] However, in the prior art, during the process that the injection nozzle of the hydraulic oil injection mechanism is inserted into the oil injection port of the hydraulic nut, the insertion depth of the injection nozzle in the oil injection port is insufficient due to insufficient pressing force, which is prone to cause leakage of hydraulic oil during the oil injection process. In addition, the oil injection port is open, and dust, impurities and other pollutants are easy to enter the inside of the oil injection port, thereby causing the oil cavity of the hydraulic nut to be polluted or corroded. SUMMARY

[0004] The application aims to provide a hydraulic nut, which aims to solve the technical problems of insufficient insertion depth of the injection nozzle in the oil injection port and easy falling of pollutants into the oil cavity of the hydraulic nut in the prior art.

[0005] To achieve the above-mentioned purpose, the application provides a hydraulic nut, which comprises a nut body, an oil injection port, a mounting seat and a sealing and pressing mechanism; the oil injection port and the mounting seat are arranged on the nut body respectively; The sealing and pressing mechanism comprises a driving rod, a pressing piece, a poking piece, a poking cylinder and a plugging piece; the driving rod is rotationally connected to the mounting seat, the pressing piece is threadedly connected with the driving rod, the poking piece is fixedly connected to the pressing piece, the poking cylinder is rotationally connected to the mounting seat, and the plugging piece is fixedly connected to the poking cylinder; The pressing piece is used for abutting and cooperating with a blocking ring of the injection nozzle, so that the pressing piece applies a pressure to the blocking ring towards the oil injection port under the driving of the driving rod; The poking cylinder is provided with a poking groove on the circumferential surface, and the poking piece is slidingly matched with the poking groove, so that the poking cylinder is rotated towards the oil injection port under the driving of the driving rod, so as to drive the plugging piece to plug the oil injection port.

[0006] In an embodiment, the knob comprises a first end, a second end and a sliding groove, the first end is close to one end of the pressing cylinder towards the oil inlet, the second end is away from one end of the pressing cylinder towards the oil inlet, the sliding groove extends from the first end to the second end, the knob and the sliding groove are in sliding fit, and the knob applies a rotating force to the pressing cylinder towards the oil inlet when the knob slides from the second end to the first end, so that the pressing cylinder drives the blocking member to block the oil inlet.

[0007] In an embodiment, the knob comprises a driving frame and a knob block connected to the driving frame, the driving frame is fixedly connected to the pressing cylinder, the knob block is in sliding fit with the sliding groove, the blocking member comprises a connecting part and a blocking part, the connecting part is fixedly connected to the pressing cylinder, and the blocking part is used for blocking the oil inlet.

[0008] In an embodiment, the number of the connecting part and the blocking part is one, the blocking part is a circular plate, and the diameter of the circular plate is greater than the inner diameter of the oil inlet.

[0009] In an embodiment, the driving frame comprises a connecting rod and a U-shaped frame, one end of the connecting rod is fixedly connected to the pressing cylinder, the other end of the connecting rod is fixedly connected to the far opening end of the U-shaped frame, the number of the knob block is two, the two knob blocks are arranged on the inner side of the opening of the U-shaped frame respectively, the number of the pressing cylinder is also two, the pressing cylinder is provided with the knob groove with opposite inclined directions on the circumferential side respectively, the two knob blocks are in sliding fit with the corresponding knob groove respectively, the number of the connecting part and the blocking part is two, the two connecting parts are connected to the two pressing cylinders respectively, the shapes of the two blocking parts are semicircular, and the two blocking parts are in interference fit to form a circular structure, and the diameter of the circular structure is greater than the inner diameter of the oil inlet.

[0010] In an embodiment, the pressing cylinder comprises a lifting block and a U-shaped resisting rod, the lifting block is connected to the driving rod through threads, the U-shaped resisting rod comprises a U-shaped tail, a U-shaped opening inner side and a U-shaped opening bottom, the U-shaped tail is fixedly connected to the lifting block, the U-shaped opening inner side is in sliding fit with the oil inlet, and the U-shaped opening bottom is in abutting fit with the blocking ring.

[0011] In an embodiment, the driving rod comprises a rod body and a knob, the knob is fixedly connected to one end of the rod body, the rod body is provided with threads, the lifting block is provided with a threaded hole corresponding to the threads, and the rod body is arranged in the threaded hole.

[0012] In an embodiment, the mounting seat is provided with a mounting groove, the lifting block is slidingly fitted in the mounting groove, and the rod body is threadedly connected with the lifting block from outside the mounting groove to inside the mounting groove.

[0013] In an embodiment, the mounting seat comprises a mounting plate and a shaft seat, the mounting groove is formed in the mounting plate, and the shaft seat is fixedly arranged on the mounting plate, and the rotating cylinder is rotationally connected with the shaft seat.

[0014] In an embodiment, the oil inlet comprises a housing and a tapered cavity formed in the housing, the housing is arranged on the nut body, and the inner diameter of the tapered cavity gradually decreases from one end away from the nut body.

[0015] The above technical solutions of the present application have at least the following beneficial technical effects: The present application has at least the following beneficial technical effects: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure schematic diagram of the hydraulic nut after the mounting of the injection nozzle according to an embodiment of the present application; Figure 2 is Figure 1 is the enlarged view of A in FIG. 4; Figure 3 is the first perspective view of the sealing and pressing mechanism according to an embodiment of the hydraulic nut provided by the present application; Figure 4 is the second perspective view of the sealing and pressing mechanism according to an embodiment of the hydraulic nut provided by the present application; Figure 5 is the cross-sectional structure schematic diagram of the oil inlet according to an embodiment of the hydraulic nut provided by the present application; Figure 6This is a schematic diagram of the overall structure of an embodiment of the hydraulic nut provided in this application without the injection nozzle installed.

[0017] Figure label: 1. Nut body; 2. Oil inlet; 21. Housing; 22. Conical cavity; 3. Mounting base; 31. Mounting groove; 32. Mounting plate; 33. Shaft seat; 4. Sealing and clamping mechanism; 41. Drive rod; 411. Rod body; 412. Knob; 42. Clamping component; 421. Lifting block; 422. U-shaped stop rod; 4221. U-shaped tail; 4222. Inner side of U-shaped opening; 4223. Bottom of U-shaped opening; 43. Actuating component; 431. Drive frame; 4311. Connecting rod; 4312. U-shaped frame; 432. Actuating block; 44. Actuating cylinder; 45. Sealing component; 451. Connecting part; 452. Sealing part; 5. Injection nozzle; 6. Retaining ring; 7. Actuating groove; 71. First groove end; 72. Second groove end; 73. Slide groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0019] The embodiments described in this application are only some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments described herein without inventive effort are within the scope of protection of this application.

[0020] Currently, the hub and main shaft of the adjustable-blade axial flow fan are connected by a conical joint, and the main shaft has an annular diffuser oil groove. During installation, the hub needs to be pushed axially a certain distance using a hydraulic nut to ensure a certain interference fit between the hub and the main shaft, so that the hub and the main shaft will not slip when the fan is running.

[0021] However, in existing technologies, during the insertion of the injection nozzle into the oil inlet of the hydraulic nut, insufficient pressure results in inadequate insertion depth of the nozzle within the oil inlet, easily leading to hydraulic oil leakage during the injection process. Furthermore, the open oil inlet allows dust, impurities, and other contaminants to easily enter, contaminating or corroding the hydraulic nut's oil cavity.

[0022] To address the aforementioned technical problems, this application provides a hydraulic nut.

[0023] In one embodiment of this application, please refer to Figures 1 to 4The hydraulic nut includes a nut body 1, an oil inlet 2, a mounting base 3, and a sealing and clamping mechanism 4. The oil inlet 2 and the mounting base 3 are respectively disposed on the nut body 1. Specifically, the oil inlet 2 and the mounting base 3 are fixedly installed on the periphery of the nut body 1. The oil inlet 2 and the mounting base 3 can be distributed radially or axially along the nut body 1, without limitation. The sealing and clamping mechanism 4 includes a drive rod 41, a clamping element 42, a toggle element 43, a toggle cylinder 44, and a sealing element 45. Specifically, the clamping element 42 can be a long bar or a U-shaped bar 422. If a long bar is used, it applies pressure from one side of the retaining ring 6. If a U-shaped bar 422 is used, its opening extends towards the injection nozzle 5, so that the U-shaped bar 422 applies pressure to both sides of the retaining ring 6. It can also be other shapes of objects capable of applying pressure, without limitation. The sealing element 45 can be a circular plate with a diameter larger than the inner diameter of the oil inlet 2, or it can be two semi-circular plates that fit together to form a single circular plate. The radii of the two semi-circular plates are equal and both larger than the inner diameter of the oil inlet 2; no specific limitation is imposed. The drive rod 41 is rotatably connected to the mounting base 3. The clamping element 42 is threadedly connected to the drive rod 41. The actuating element 43 is fixedly connected to the clamping element 42. The actuating cylinder 44 is rotatably connected to the mounting base 3. The sealing element 45 is fixedly connected to the actuating cylinder 44. The clamping element 42 abuts against the retaining ring 6 of the injection nozzle 5, so that the clamping element 42, driven by the drive rod 41, applies pressure towards the oil inlet 2 to the retaining ring 6, thereby increasing the insertion depth of the injection nozzle 5 within the oil inlet 2. This results in the injection nozzle 5 forming different depths of compression and adhesion within the oil inlet 2, using mechanical pressure to enhance the sealing effect and ensure that hydraulic oil is not prone to leakage during the injection process. This ensures injection efficiency while reducing oil waste and environmental pollution. The circumferential surface of the actuating cylinder 44 is provided with an actuating groove 7. The actuating element 43 slides in the actuating groove 7 so that the actuating cylinder 44 rotates toward the oil inlet 2 under the drive of the drive rod 41, thereby driving the sealing element 45 to seal the oil inlet 2, thus preventing contaminants from falling into the oil cavity of the hydraulic nut through the oil inlet 2, which helps to reduce the contamination rate of the hydraulic nut oil cavity.

[0024] The technical solution of this application involves creating a sliding groove 7 on the circumferential surface of the actuating cylinder 44, allowing the actuating member 43 to slide within the groove 7. This causes the actuating cylinder 44 to rotate towards the oil inlet 2 under the drive of the drive rod 41, which in turn drives the sealing member 45 to seal the oil inlet 2. This prevents contaminants from falling into the oil cavity of the hydraulic nut through the oil inlet 2, thus reducing the contamination rate of the hydraulic nut's oil cavity. Furthermore, the clamping member 42 is threadedly connected to the drive rod 41, so that the clamping member 42, under the drive of the drive rod 41, applies pressure to the retaining ring 6 towards the oil inlet 2. This increases the insertion depth of the injection nozzle 5 within the oil inlet 2, creating varying depths of compression and adhesion within the oil inlet 2. This mechanical pressure enhances the sealing effect, ensuring that hydraulic oil is less prone to leakage during the oil injection process. This approach guarantees oil injection efficiency while reducing oil waste and environmental pollution. In addition, the hydraulic nut operation process is simple and efficient, and can be completed manually without the need for electrical equipment, which helps to save energy and manufacturing costs. The operation steps are simple and easy to understand, and can be completed without professional skills, which greatly reduces the difficulty of operation for operators and improves the overall efficiency of oil injection.

[0025] In one implementation, please refer to Figure 2 The actuating groove 7 includes a first groove end 71, a second groove end 72, and a sliding groove 73. The first groove end 71 is near the end of the actuating cylinder 44 facing the pressing member 42, and the second groove end 72 is away from the end of the actuating cylinder 44 facing the pressing member 42. The sliding groove 73 extends obliquely from the first groove end 71 to the second groove end 72. The actuating member 43 slides in conjunction with the sliding groove 73, so that as the actuating member 43 slides from the second groove end 72 to the first groove end 71, it applies a rotational force toward the oil inlet 2 to the actuating cylinder 44, causing the actuating cylinder 44 to drive the sealing member 45 to seal the oil inlet 2. This embodiment can clearly define the sliding path and direction of the actuating member 43, which is beneficial to achieve a stable and precise rotational force applied by the actuating member 43 to the actuating cylinder 44, thereby improving the reliability and consistency of the sealing action of the oil inlet 2.

[0026] In one implementation, please refer to Figure 3 The actuating component 43 includes a drive frame 431 and an actuating block 432 connected to the drive frame 431. The drive frame 431 is fixedly connected to the clamping component 42, and the actuating block 432 is slidably engaged with the slide groove 73. The sealing component 45 includes a connecting part 451 and a sealing part 452. The connecting part 451 is fixedly connected to the actuating cylinder 44, and the sealing part 452 is used to seal the oil inlet 2. This embodiment can ensure the stability of the actuating component 43 and reliable force transmission during the sliding process, which is beneficial to improving the rotational force transmission efficiency of the actuating cylinder 44, and ensuring that the sealing component 45 can accurately and reliably seal the oil inlet 2, thereby enhancing the system's sealing performance and operational accuracy.

[0027] In one implementation, please refer to Figure 2The number of connecting parts 451 and sealing parts 452 is one each. The sealing part 452 is a circular plate with a diameter larger than the inner diameter of the oil inlet 2. By setting a circular plate as the sealing part 452 with a diameter larger than the inner diameter of the oil inlet 2, this embodiment can ensure tight coverage during sealing, which is beneficial to improving the sealing effect of the oil inlet 2 and preventing lubricating oil leakage.

[0028] In one implementation, please refer to Figure 3 The drive frame 431 includes a connecting rod 4311 and a U-shaped frame 4312. One end of the connecting rod 4311 is fixedly connected to the clamping member 42, and the other end of the connecting rod 4311 is fixedly connected to the end of the U-shaped frame 4312 away from the opening. There are two actuating blocks 432, which are respectively set inside the opening of the U-shaped frame 4312. There are also two actuating cylinders 44. The two actuating cylinders 44 are respectively provided with actuating grooves 7 with opposite inclination directions on their circumferences. The two actuating blocks 432 are respectively slidably engaged with the corresponding actuating grooves 7. There are two connecting parts 451 and two sealing parts 452. The two connecting parts 451 are respectively connected to the two actuating cylinders 44. The two sealing parts 452 are semi-circular in shape. The two sealing parts 452 are interference-fitted to form a circular structure. The diameter of the circular structure is larger than the inner diameter of the oil inlet 2. This embodiment, by setting two actuating blocks 432 to cooperate with the actuating cylinder 44 having oppositely inclined actuating grooves 7, can achieve synchronous rotation control of the two semi-circular sealing parts 452 to form a sealing structure, which is beneficial to improving the stability and sealing reliability of the oil injection port 2. In addition, by setting the sealing part 452 as two semi-circular structures, when the injection port is unsealed, the two semi-circular sealing parts 452 are respectively distributed on both sides of the injection port. Compared with a single circular sealing part 452, this saves space, facilitates assembly in space-constrained environments, and improves assembly flexibility and equipment maintenance efficiency.

[0029] In one implementation, please refer to Figure 3 The clamping component 42 includes a lifting block 421 and a U-shaped abutment 422. The lifting block 421 is threadedly connected to the drive rod 41. The U-shaped abutment 422 includes a U-shaped tail 4221, an inner side of the U-shaped opening 4222, and a bottom of the U-shaped opening 4223. The U-shaped tail 4221 is fixedly connected to the lifting block 421. The inner side of the U-shaped opening 4222 is used for sliding engagement with the injection nozzle 5, and the bottom of the U-shaped opening 4223 is used for abutting engagement with the retaining ring 6. This embodiment, through the combination of the lifting block 421 and the U-shaped abutment 422, not only achieves adjustable clamping of the structure, but also provides stable three-dimensional positioning through the wrapping design of the U-shaped abutment 422, which helps to ensure that the injection nozzle 5 is not easily loosened or displaced during operation.

[0030] In one implementation, please refer to Figure 2 and Figure 3The drive rod 41 includes a rod body 411 and a knob 412. The knob 412 is fixedly connected to one end of the rod body 411. The rod body 411 is threaded, and the lifting block 421 has a threaded hole corresponding to the thread. The rod body 411 passes through the threaded hole. This embodiment drives the lifting block 421 to move through the knob 412 and the threaded rod body 411, which can achieve precise lifting and lowering adjustment of the structure, and is beneficial to improving the control accuracy and ease of use of the clamping operation.

[0031] In one implementation, please refer to Figure 3 and Figure 4 The mounting base 3 has a mounting groove 31, and the lifting block 421 is slidably fitted into the mounting groove 31. The rod 411 passes from the outside of the mounting groove 31 into the inside of the mounting groove 31 and is threadedly connected to the lifting block 421. This embodiment, by sliding the lifting block 421 in the mounting groove 31 and controlling it with an external drive rod 41 threaded connection, can achieve stable guidance and convenient adjustment of the sealing and pressing mechanism 4, which is beneficial to improving assembly accuracy and structural compactness.

[0032] In one implementation, please refer to Figure 3 and Figure 4 The mounting base 3 includes a mounting plate 32 and a bearing 33. A mounting groove 31 is formed in the mounting plate 32, and the bearing 33 is fixedly mounted on the mounting plate 32. The actuating cylinder 44 is rotatably connected to the bearing 33. This embodiment, by rotatably connecting the actuating cylinder 44 to the bearing 33 and fixing it as a whole to the mounting plate 32, can achieve stable support and reliable rotation of the actuating mechanism, which is beneficial to improving the smoothness of operation and the assembly firmness of the structure.

[0033] In one implementation, please refer to Figure 5 The oil inlet 2 includes a housing 21 and a conical cavity 22 opened in the housing 21. The housing 21 is set on the nut body 1. The inner diameter of the conical cavity 22 decreases sequentially from the end away from the nut body 1, which can easily adapt to the hydraulic oil injection nozzle 5 of different diameter specifications. There is no need to replace the special docking parts for the specific diameter injection nozzle 5. This effectively solves the problem of single docking and poor versatility of traditional devices, which helps to reduce the cost of equipment use and improve the applicability of the hydraulic nut in different scenarios.

[0034] The specific implementation process of this application embodiment is as follows: Please refer to... Figure 1 , Figure 2 and Figure 6When the hydraulic oil injection mechanism is needed to inject oil into the nut body 1, first, turn the knob 412 by hand, so that the rod 411 drives the lifting block 421 and the drive frame 431 to descend, thereby causing the actuating block 432 to slide along the actuating groove 7. Since the two actuating grooves 7 are inclined in opposite directions, the actuating block 432 will generate a circumferential rotational force on the actuating cylinder 44 while driving it to descend. Under the action of this rotational force, the actuating cylinder 44 rotates away from the oil injection port 2, thereby driving the two sealing parts 45 to move towards each other and move away from each other, thus unsealing the oil injection port 2. When the oil injection port 2 is unsealed, stop turning the knob 412, insert the injection nozzle 5 of the hydraulic oil injection mechanism into the oil injection port 2, and position the injection nozzle 5 in the U-shaped opening of the U-shaped abutment rod 422, so that the inner side 4222 of the U-shaped opening and the injection nozzle 5 slide together, and the retaining ring 6 at the bottom 4223 of the U-shaped opening abuts together. Then, continue to rotate knob 412 in the same direction, causing rod 411 to drive lifting block 421 to continue descending, thereby driving U-shaped abutment 422 to apply pressure to retaining ring 6 toward oil inlet 2, increasing the insertion depth of injection nozzle 5 in oil inlet 2. After oil injection is completed, pull out injection nozzle 5, and then rotate knob 412 in the opposite direction, causing rod 411 to drive drive frame 431 to rise, thereby causing toggle block 432 to generate a circumferential rotational force on toggle cylinder 44 in the opposite direction while driving toggle cylinder 44 to rise. Under the action of this rotational force, toggle cylinder 44 rotates toward the direction closer to oil inlet 2, thereby driving the two sealing parts 45 to move closer to each other, and finally sealing oil inlet 2.

[0035] This application aims to protect a hydraulic nut. The technical solution of this application involves creating a turning groove 7 on the circumferential surface of a turning cylinder 44, allowing the turning member 43 to slide within the turning groove 7. This causes the turning cylinder 44 to rotate towards the oil inlet 2 under the drive of the drive rod 41, which in turn drives the sealing member 45 to seal the oil inlet 2. This prevents contaminants from falling into the oil cavity of the hydraulic nut through the oil inlet 2, thus reducing the contamination rate of the hydraulic nut's oil cavity. Furthermore, the clamping member 42 is threadedly connected to the drive rod 41, so that the clamping member 42, driven by the drive rod 41, applies pressure to the retaining ring 6 towards the oil inlet 2. This increases the insertion depth of the injection nozzle 5 within the oil inlet 2, creating varying depths of compression and adhesion within the oil inlet 2. The mechanical pressure enhances the sealing effect, ensuring that hydraulic oil is less prone to leakage during the injection process. This guarantees injection efficiency while reducing oil waste and environmental pollution. In addition, the hydraulic nut operation process is simple and efficient, and can be completed manually without the need for electrical equipment, which helps to save energy and manufacturing costs. The operation steps are simple and easy to understand, and can be completed without professional skills, which greatly reduces the difficulty of operation for operators and improves the overall efficiency of oil injection.

[0036] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this application and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this application should be included within the protection scope of this application. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A hydraulic nut, characterized in that, It includes a nut body (1), an oil inlet (2), a mounting base (3), and a sealing and clamping mechanism (4); the oil inlet (2) and the mounting base (3) are respectively disposed on the nut body (1); The sealing and pressing mechanism (4) includes a drive rod (41), a pressing member (42), a toggle member (43), a toggle cylinder (44), and a sealing member (45); the drive rod (41) is rotatably connected to the mounting base (3), the pressing member (42) is threadedly connected to the drive rod (41), the toggle member (43) is fixedly connected to the pressing member (42), the toggle cylinder (44) is rotatably connected to the mounting base (3), and the sealing member (45) is fixedly connected to the toggle cylinder (44). The clamping member (42) is used to abut against the retaining ring (6) of the injection nozzle (5) so that the clamping member (42) applies pressure toward the oil injection port (2) to the retaining ring (6) under the drive of the drive rod (41); The actuating cylinder (44) has an actuating groove (7) on its peripheral surface. The actuating member (43) slides in the actuating groove (7) so that the actuating cylinder (44) rotates toward the oil inlet (2) under the drive of the driving rod (41) so as to drive the sealing member (45) to seal the oil inlet (2).

2. The hydraulic nut according to claim 1, characterized in that, The actuating groove (7) includes a first groove end (71), a second groove end (72), and a sliding groove (73). The first groove end (71) is close to the end of the actuating cylinder (44) facing the clamping member (42), and the second groove end (72) is away from the actuating cylinder (44) facing the clamping member (42). The sliding groove (73) extends obliquely from the first groove end (71) to the second groove end (72). The actuating member (43) slides in cooperation with the sliding groove (73) so that the actuating member (43) applies a rotational force toward the oil inlet (2) to the actuating cylinder (44) during the process of sliding from the second groove end (72) to the first groove end (71), so that the actuating cylinder (44) drives the sealing member (45) to seal the oil inlet (2).

3. The hydraulic nut according to claim 2, characterized in that, The actuating component (43) includes a drive frame (431) and an actuating block (432) connected to the drive frame (431). The drive frame (431) is fixedly connected to the clamping component (42). The actuating block (432) is slidably engaged with the slide groove (73). The sealing component (45) includes a connecting part (451) and a sealing part (452). The connecting part (451) is fixedly connected to the actuating cylinder (44). The sealing part (452) is used to seal the oil inlet (2).

4. The hydraulic nut according to claim 3, characterized in that, The number of the connecting part (451) and the sealing part (452) is one. The sealing part (452) is a circular plate with a diameter larger than the inner diameter of the oil inlet (2).

5. The hydraulic nut according to claim 3, characterized in that, The drive frame (431) includes a connecting rod (4311) and a U-shaped frame (4312). One end of the connecting rod (4311) is fixedly connected to the clamping member (42), and the other end of the connecting rod (4311) is fixedly connected to the end of the U-shaped frame (4312) away from the opening. There are two actuating blocks (432), and the two actuating blocks (432) are respectively disposed inside the opening of the U-shaped frame (4312). There are also two actuating cylinders (44). The two actuating blocks (432) are respectively provided with actuating grooves (7) with opposite inclination directions on their periphery. The two actuating blocks (432) are respectively slidably engaged with the corresponding actuating grooves (7). There are two connecting parts (451) and two sealing parts (452). The two connecting parts (451) are respectively connected to the two actuating cylinders (44). The two sealing parts (452) are semi-circular in shape. The two sealing parts (452) are interference-fitted to form a circular structure. The diameter of the circular structure is larger than the inner diameter of the oil inlet (2).

6. The hydraulic nut according to any one of claims 1 to 5, characterized in that, The clamping component (42) includes a lifting block (421) and a U-shaped abutment (422). The lifting block (421) is connected to the drive rod (41) by a thread. The U-shaped abutment (422) includes a U-shaped tail (4221), an inner side of the U-shaped opening (4222), and a bottom of the U-shaped opening (4223). The U-shaped tail (4221) is fixedly connected to the lifting block (421). The inner side of the U-shaped opening (4222) is used to slide with the injection nozzle (5). The bottom of the U-shaped opening (4223) is used to abut with the retaining ring (6).

7. The hydraulic nut according to claim 6, characterized in that, The drive rod (41) includes a rod body (411) and a knob (412). The knob (412) is fixedly connected to one end of the rod body (411). The rod body (411) is provided with threads. The lifting block (421) has a threaded hole corresponding to the threads. The rod body (411) passes through the threaded hole.

8. The hydraulic nut according to claim 7, characterized in that, The mounting base (3) has a mounting groove (31) inside, the lifting block (421) is slidably fitted in the mounting groove (31), and the rod (411) passes through the outside of the mounting groove (31) and enters the inside of the mounting groove (31) and is threadedly connected to the lifting block (421).

9. The hydraulic nut according to claim 8, characterized in that, The mounting base (3) includes a mounting plate (32) and a bearing seat (33). The mounting groove (31) is formed on the mounting plate (32). The bearing seat (33) is fixedly mounted on the mounting plate (32). The actuating cylinder (44) is rotatably connected to the bearing seat (33).

10. The hydraulic nut according to any one of claims 1 to 5, characterized in that, The oil inlet (2) includes a housing (21) and a conical cavity (22) opened in the housing (21). The housing (21) is located on the nut body (1). The inner diameter of the conical cavity (22) decreases sequentially from the end away from the nut body (1).

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