Intelligent limiting end face seal static ring automatic installation tool and use method

Abstract

The application discloses an automatic installation tool for intelligent limiting end face sealing static ring and a use method, and belongs to the technical field of end face sealing installation. The tool comprises a sleeve, a pressure head, a driving assembly and a limiting and measurement control unit. The sleeve is radially positioned by meshing the inner spline of the large end with the outer spline of the gear; the pressure head is sleeved on the sleeve and can axially slide, and the large end is provided with a shaft shoulder for accommodating the static ring and a stop edge for limiting; the driving assembly pushes the pressure head through a threaded nut mechanism or a linear driving device; the limiting and measurement control unit comprises a pressure sensor and / or a mechanical limiting structure. The use method comprises the steps of tool positioning, static ring prepositioning, driving and pressing, and in-place determination. The application realizes automatic centering, accurate limiting and intelligent control of pressing force during the installation process, solves the problems of static ring deflection, uneven stress and difficult control of pre-tightening force caused by traditional manual installation, significantly improves the installation quality and efficiency, and is particularly suitable for the maintenance of precision equipment such as helicopter reducers.

Description

Technical Field

[0001] This invention relates to the field of mechanical assembly technology, specifically to a tool and method for installing end-face sealing stationary rings in precision mechanical equipment, which is particularly suitable for the maintenance of equipment with extremely high sealing performance requirements, such as aero engines and helicopter gearboxes. Background Technology

[0002] Face seals (also known as mechanical seals) are critical components in rotating machinery to prevent fluid leakage and are widely used in aerospace, shipbuilding, and chemical industries. Taking a helicopter main gearbox as an example, its face seal typically consists of a rotating dynamic ring and a stationary static ring (usually a graphite ring). The two end faces are tightly fitted together under spring or medium pressure to form a dynamic seal. The installation quality of the static ring directly determines the reliability and lifespan of the seal. During installation, the static ring must be perfectly coaxial with the mounting hole (usually located on the bearing housing), and a suitable preload must be maintained after press-fitting. Insufficient preload will lead to leakage during operation; excessive preload will accelerate graphite ring wear, causing premature seal failure.

[0003] Currently, at equipment maintenance sites, stationary rings are mostly installed using simple manual pressing tools. For example... Figure 2 As shown, traditional tools typically consist of only a simple pressure head. This installation method has significant drawbacks:

[0004] 1. Poor positioning accuracy: The tool lacks an effective radial positioning mechanism. In the narrow space of the machine, it is difficult for the operator to ensure that the axis of the pressure head is completely aligned with the axis of the mounting hole, which can easily cause the stationary ring to be misaligned, resulting in an initial misalignment.

[0005] 2. No precise limit: The pressing depth depends entirely on the operator's "feel" and experience, and it is impossible to accurately control the final axial position of the stationary ring, that is, it is impossible to accurately control the initial clamping amount (preload) between the end faces of the moving and stationary rings.

[0006] 3. Uneven stress: Due to misalignment, the force applied to the end face of the stationary ring during press-fitting is uneven, which may cause excessive local stress on the stationary ring and damage it, or cause the auxiliary seals such as the O-ring on its back to be twisted and damaged.

[0007] 4. Lack of process monitoring: There is no quantitative feedback throughout the entire pressing process, and the consistency of installation quality cannot be guaranteed, which may lead to oil leakage during equipment operation.

[0008] Therefore, there is an urgent need to develop an intelligent installation tool that can achieve automatic centering, precise positioning, and monitoring of the pressing process, in order to improve the installation quality, reliability, and maintenance efficiency of end face seals. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing manual installation tools and provide an intelligent, limit-positioning, automatic installation tool and method for the stationary ring of the end face seal. This tool aims to achieve automatic centering, precise axial positioning, and intelligent control of the pressing force during the installation process, fundamentally solving the problems of stationary ring installation misalignment and inaccurate preload control, improving the standardization and intelligence of installation operations, and ensuring the long-term reliable operation of the sealing components.

[0010] To achieve the above objectives, the technical solution of the present invention is implemented as follows: In a first aspect, the present invention provides an intelligent limit end face sealing stationary ring automatic installation tool.

[0011] The core design concept of this tool is to use the precision features (external spline) of the component being installed (gear) as a positioning reference, and to achieve the first precise positioning through the matching structure on the tool (internal spline sleeve); then to use the guide mechanism inside the tool (clearance fit between the sleeve and the pressure head) to ensure the straightness of the pressing process; finally, to achieve dual precise control of the pressing endpoint and preload through a combination of mechanical limit structure and pressure sensor feedback.

[0012] Specifically, the tool includes the following components: 1. Sleeve: Serves as the tool's base and main positioning component. It is designed as a stepped shaft with a precision internal spline machined at the large end. The specifications of this internal spline perfectly match the external spline on the shaft end of the gear to be mounted. During installation, the internal spline of the sleeve is fitted onto the external spline of the gear, achieving high-precision radial positioning (centering) between the tool and the workpiece. Simultaneously, the end face of the large end of the sleeve is designed to mate with the end face of a shoulder of the gear, thus achieving initial axial positioning. The sleeve has a hollow internal structure, and its internal cavity dimensions must ensure sufficient space to accommodate protrusions such as the gear's shoulder to avoid interference. To further enhance rigidity, reinforcing ribs can be added to the inner wall of the small end of the sleeve.

[0013] 2. Press Head: This is the actuator that directly contacts and pushes the stationary ring. The press head is also designed in a stepped shape and coaxially fits around the small end of the sleeve. A precise clearance fit (e.g., H7 / g6) is used between the press head and the sleeve, allowing the press head to slide smoothly along the sleeve axis while also receiving good radial guidance from the sleeve, ensuring a straight pressing path. The large end of the press head is the key functional part. Shoulder: A ring-shaped groove or step is machined in the shoulder, the diameter of which matches the outer diameter of the end-face sealing stationary ring or a specific mounting structure, to accommodate and preliminarily position the stationary ring before press-fitting. The depth (δ1) of the shoulder is a critical design dimension.

[0014] Shoulder: A raised annular shoulder is designed around the shaft shoulder. The outer diameter of the shoulder is slightly smaller than the inner diameter of the bearing housing mounting hole. The distance (δ2) from the front end face of the shoulder to the large end face of the pressure head is another key design dimension.

[0015] Dimension chain design: δ1 and δ2 are not arbitrary values, but are precisely calculated based on an axial dimension chain composed of "gear shoulder position," "bearing housing end face position," and "theoretical position of the stationary ring after installation." The design goal is that when the pressure head is pushed until its flange is tightly fitted with the bearing housing end face (mechanical hard stop), the stationary ring is precisely pressed into its theoretically designed position. At this point, the shoulder depth δ1 ensures no gap between the back of the stationary ring and the pressure head end face, while the flange distance δ2 determines the final stroke of the press-fit.

[0016] 3. Drive Components: Used to provide smooth and controllable axial pressing force. A preferred embodiment employs a "rotation-linear" conversion mechanism. Specifically: an external thread is machined on the outer cylindrical surface of the small end of the sleeve; a nut that mates with this external thread is provided; and an intelligent electric drive device (such as a servo motor or stepper motor with a reducer) is used to drive the nut to rotate. When the nut rotates, it moves axially along the sleeve under the action of the thread. The front end face of the nut contacts the small end face of the press head, thereby converting the rotational motion into the linear pushing motion of the press head. This threaded drive method has advantages such as smooth feed, easy control, and the ability to provide a large driving force. Alternative solutions may also use linear motors, electric actuators, etc., to directly drive the press head.

[0017] 4. Limit and Control Unit: This is the core component embodying the tool's "intelligence." It consists of two parts: Mechanical limit: This refers to the contact between the flange on the aforementioned pressure head and the end face of the bearing housing. This is a hard limit of absolute position, ensuring repeatable positioning accuracy for each installation.

[0018] Pressure sensing and feedback control: Multiple miniature pressure sensors (such as piezoelectric or strain gauge types) are uniformly embedded circumferentially on the end face of the large end of the press head (i.e., the surface in contact with the back of the stationary ring). These sensors can monitor the magnitude and uniformity of the pressure acting on the stationary ring during the press-fitting process in real time. The pressure signal is transmitted to the control system (which can be integrated into an intelligent electric drive device).

[0019] The intelligent electric drive device receives signals from the pressure sensor and can achieve two control modes: Reaching Mode: When the pressure value reaches the preset target preload range, the drive unit automatically stops, even if the flange has not yet contacted the bearing housing. This is suitable for applications with strict preload requirements and where a small amount of overtravel is permissible in the installation space.

[0020] Monitoring mode: The drive unit continues to run until the flange contacts the bearing housing (mechanical limit). During this process, the system continuously records the pressure curve. After installation, the operator can check whether the final stable pressure value is within the acceptable range to determine whether the installation was successful. If the pressure is abnormal (too high or too low), it indicates that there may be other problems with the installation (such as dimensional errors, foreign objects, etc.).

[0021] Secondly, the present invention provides a method for using the above-described installation tool.

[0022] This method has a standardized process, which greatly reduces reliance on human experience, and includes the following steps: S1: Installation and Positioning Steps. Clean the external spline of the gear and the shoulder of the shaft. Pick up the sleeve portion of the tool, carefully align its internal spline with the external spline of the gear, and then smoothly insert it until the large end face of the sleeve is completely against the gear shoulder. This step completes the precise "zeroing" positioning of the tool on the workpiece.

[0023] S2: Stationary Ring Pre-installation Step. Gently place the end face sealing stationary ring (usually equipped with O-rings and other accessories) into the shoulder of the large end of the pressure head, and make slight adjustments by hand or with auxiliary tools to ensure that the back of the stationary ring is flat and in close contact with the bottom surface of the shoulder.

[0024] S3: Drive Press Fitting Step. Start the intelligent electric drive device. The device drives the nut to rotate, and the nut pushes the press head forward smoothly and uniformly along the sleeve. The press head drives the stationary ring inside its shoulder to advance together into the mounting hole on the bearing housing.

[0025] S4: Position determination step. This step has two parallel or selective determination mechanisms: 1. Mechanical limit judgment: When the pressure head advances to the point where its stop edge contacts the end face of the bearing seat and the resistance increases sharply, the drive device detects the current rise or receives a torque signal, judges that the mechanical end point has been reached, and then stops or reverses slightly to release stress.

[0026] 2. Pressure Feedback Detection: During the press-fitting process, the control system reads the pressure sensor values ​​in real time. When the pressure reaches the preset "installation position pressure threshold," the drive unit immediately stops, regardless of whether the flange is in contact.

[0027] Operators can select the appropriate judgment mode based on the operating conditions. After installation, the final pressure value and uniformity index can be read from the control panel as data records indicating successful installation.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Extremely high installation accuracy, eliminating misalignment: The high-precision feature of the gear external spline is used for positioning, which fundamentally ensures the coaxiality of the installation tool and the installation hole. This ensures that the stationary ring always moves along the correct axis during the pressing process, completely solving the misalignment problem caused by the difficulty of manual installation alignment.

[0029] 2. Precise and quantifiable preload control: Through a dual approach of "mechanical dimension chain limiting" and "real-time pressure monitoring," the axial position and end face preload after the stationary ring is press-fitted can be precisely controlled. This ensures that the preload is within the ideal range and allows for the recording and traceability of installation data for each unit, achieving controllable and traceable installation quality.

[0030] 3. Automated and intelligent operation, reducing human error: The entire pressing process is completed automatically by an electrically driven device, ensuring uniform feeding speed and avoiding manual impact. Combined with sensor feedback, process monitoring and intelligent judgment are achieved, reducing the skill and experience requirements for operators and improving the standardization and consistency of operations.

[0031] 4. Ingenious structure and high reliability: The tool has a simple structure; the sleeve, pressure head, nut, etc., are all machined parts, making them sturdy and durable. Mechanical limit switches provide the final guarantee, ensuring high reliability. The clearance fit guiding method ensures accuracy while allowing for minor compensation, preventing jamming.

[0032] 5. Improved maintenance efficiency and safety: This tool is easy to operate, with quick preparation and pressing processes, significantly improving the efficiency of field or workshop maintenance. At the same time, automated pressing reduces the risk of workplace injuries caused by improper force applied by operators.

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0034] Figure 1 This is a partial sectional view of the gear and bearing housing assembly to be installed, showing the installation position relationship of the end face sealing stationary ring.

[0035] Figure 2 This is a schematic diagram of the structure and usage of a manual pressing tool in the prior art.

[0036] Figure 3 This is a cross-sectional view of the overall structure of an embodiment of the intelligent limit end face sealing stationary ring automatic installation tool of the present invention.

[0037] Figure 4 This is a schematic diagram illustrating the usage state of the tool of the present invention before and after installation.

[0038] The following are the labels in the attached diagram: 1. Sleeve; 2. Pressure head; 3. Nut; 4. Intelligent electric drive device; 5. Pressure sensor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some embodiments of this invention, but not all embodiments.

[0040] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0041] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0042] The following is in conjunction with the appendix Figure 1-4 The embodiments of the present invention will be described in detail below.

[0043] Example 1: Smart tool for installing graphite sealing rings in helicopter main gearboxes This embodiment uses the installation of a critical end face graphite sealing ring (stationary ring) on ​​the main gearbox of a certain type of helicopter as an application scenario.

[0044] I. Detailed Explanation of Tool Structure (See) Figure 3 ) This intelligent installation tool mainly consists of the following components: Sleeve 1: Made of 40Cr alloy steel through quenching and tempering, it has good strength and toughness.

[0045] The shaft has a two-step stepped shape. The outer diameter of the large end is Φ85mm, and the inner hole is machined with a precision internal spline with the specifications of "module 2, number of teeth 38, pressure angle 30°". The parameters of this spline are completely consistent with the external spline on the end of a specific gear shaft on the reducer.

[0046] The large end face is precision ground to serve as axial positioning reference A.

[0047] The small end has an outer diameter of Φ60mm and is milled with a precision external thread of M56×2.

[0048] Sleeve 1 has a total length of 150mm and an internal through hole with a diameter of Φ52mm. This dimension is larger than the maximum outer diameter of the gear shaft shoulder (Φ50mm) to ensure no interference during assembly.

[0049] Two axial reinforcing ribs are symmetrically milled into the inner hole of the small end to resist the bending stress that may be generated during press fitting.

[0050] Pressure head 2: Made of GCr15 bearing steel, which has high hardness and wear resistance after quenching.

[0051] It also features a stepped structure with a total length of 0mm. Its central through-hole has a diameter of Φ60.05mm, forming an H7 / g6 clearance fit with the outer diameter (Φ60mm) of the small end of sleeve 1. The clearance is approximately 0.02-0.05mm. This clearance ensures smooth sliding of the pressure head 2 while providing effective radial guidance.

[0052] The large-end design is used as the core functional area: Shoulder: A ring-shaped step with a depth of δ1=5.0±0.01mm is machined out. The inner diameter of the step is Φ72h7, which forms a clearance fit with the outer diameter (Φ72f7) of the graphite stationary ring to accommodate the stationary ring.

[0053] Flange: A raised ring is machined around the outer edge of the shaft shoulder as a flange, with an outer diameter of Φ79.8mm (smaller than the bearing housing mounting hole Φ80H8). The distance from the front end face of the flange to the large end face of the pressure head is δ2=10.2±0.02mm.

[0054] Dimension chain calculation: Based on measurements and design drawings, the axial distance from the gear shoulder to the bearing housing end face is L1 = 45.0 mm. After the stationary ring is press-fitted into place, the theoretical distance from its back surface to the bearing housing end face is L2 = 35.0 mm. Therefore, the press-fit stroke should be S = L1 - L2 = 10.0 mm. To ensure no gap between the back surface of the stationary ring and the end face of the press head after press-fitting, and to compensate for minor errors, δ1 = 5.0 mm (slightly larger than the stationary ring thickness of 4.8 mm) is set, and δ2 = S + (δ1 - stationary ring thickness) = 10.0 + (5.0 - 4.8) = 10.2 mm.

[0055] The small end face of the pressure head 2 serves as the bearing surface of the nut 3.

[0056] Nut 3: Made of brass, it mates with the sleeve thread, serving to push and transmit force, while also providing self-lubrication to the threads. One end can be connected to the interface of an electric drive device.

[0057] Intelligent electric drive device 4: In this embodiment, a servo electric tightening shaft with an integrated controller is used. Its output shaft is connected to nut 3 via a quick-change interface. This device has torque control, angle control, and speed control functions, and is equipped with a communication interface.

[0058] Pressure sensor 5: Four miniature thin-film pressure sensors are embedded at 90° intervals in the annular groove on the large end face of the pressure head 2. Wires are led out from small holes on the side of the pressure head and connected to the controller of the drive unit 4. The sensor range is 0-0N, and the accuracy is ±1%FS.

[0059] II. Usage Instructions (see...) Figure 4 ) Preparation: Clean the relevant parts of the reducer. Fix the intelligent electric drive device 4 to the portable bracket or robotic arm. Set the pressing parameters on the controller: Select "Torque + Angle Monitoring Mode"; set the target torque to 150 N·m (corresponding to the force pushing the pressure head); set the maximum allowable angle to the theoretical number of rotations corresponding to the δ2 ​​stroke (in this example, the pitch is 2 mm, the stroke is 10.2 mm, approximately 5.1 rotations).

[0060] S1: Installation and Positioning: The operator holds the assembled sleeve 1 and pressure head 2 (with the pressure head at the rear end), carefully aligns the internal spline of sleeve 1 with the external spline of the gear, and then gently pushes it in until a slight "click" is heard, indicating that the large end face of sleeve 1 is fully engaged with the gear shaft shoulder. At this point, the tool has achieved precise radial and axial positioning.

[0061] S2: Stationary Ring Preset: Carefully place the new graphite stationary ring and its sealing ring into the shoulder of the large end of the pressure head 2, and gently rotate it to ensure that it sits smoothly and that the back is in close contact with the bottom surface of the shoulder.

[0062] S3: Drive Press Fitting: Connect and lock the output head of the electric drive device 4 to the nut 3. Press the start button on the controller. The servo motor starts working, driving the nut 3 to rotate at a constant low speed (e.g., 2 r / min). The nut 3 rotates forward, and after its end face contacts the small end face of the press head 2, it begins to push the entire press head 2 smoothly forward along the sleeve 1.

[0063] S4: Position Determination and Recording During the pressing process, the controller reads the values ​​from the four pressure sensors 5 in real time and calculates the average and difference values. The average value displays the real-time pressing force, and the difference value is used to determine whether there is an off-center load (an alarm is triggered if the difference value is too large).

[0064] When nut 3 rotates to the preset 5.1 turns (corresponding to a theoretical stroke of 10.2 mm), the flange of pressure head 2 contacts the end face of the bearing housing, and the resistance increases sharply. The drive device 4 detects that the torque has increased instantaneously beyond the set value (150 N·m) and immediately executes the "stop" command.

[0065] At this point, the controller screen displays "Installation Complete". The final stable pressure sensor average reading is 00N, and the pressure value deviation at the four points is less than 5%, so the system determines "Installation is qualified, pressure is uniform". The torque-angle curve, final pressure value, and other data from this installation are automatically saved to the log.

[0066] The operator reverses the drive mechanism and removes the nut to easily remove the entire installation tool. Inspect the stationary ring to confirm it is flush and properly seated within the bearing housing bore.

[0067] III. Effect Verification After using this tool, the maintenance rework rate of this type of reducer's seal decreased from approximately 15% (mainly due to oil leakage) to nearly 0%. Installation time was reduced from about 20 minutes, which previously relied on experienced technicians' feel and involved repeated adjustments, to a stable and reliable 5 minutes. The traceability of installation data also provides valuable information for subsequent fault analysis and lifespan prediction.

[0068] Example 2 See Figure 3-4 The present invention provides an intelligent limit end face sealing stationary ring automatic installation tool, which includes: sleeve 1, pressure head 2, nut 3, intelligent electric drive device 4 and pressure sensor 5.

[0069] Sleeve 1 adopts a stepped structure design, with its large end engaging with the external spline on the gear for centering; The pressure head adopts a stepped structure design, is sleeved on the sleeve 1, and can move linearly relative to the sleeve 1; The intelligent electric drive device 4 can drive the pressure head 2 to move linearly relative to the sleeve 1.

[0070] Furthermore, at the point where the pressure head 2 fits against the end face sealing ring, several pressure sensors 5 are evenly distributed circumferentially.

[0071] Furthermore, the sleeve 1 has an internal spline at its large end, which engages with the external spline on the gear for centering.

[0072] Furthermore, a reinforcing rib is provided in the inner cavity of the small end of the sleeve 1.

[0073] Furthermore, the sleeve 1 and the pressure head 2 are fitted with a clearance fit, and the length of the larger end of the pressure head 2 is greater than the length of the larger end of the sleeve 1.

[0074] Furthermore, it also includes a nut 3, which has an external thread on the outer surface of the small end of the sleeve 1 to fit the nut 3. The intelligent electric drive device 4 drives the nut 3 to screw in, so that the end face of the nut 3 fits against the small end face of the pressure head 2, thereby driving the pressure head 2.

[0075] Furthermore, a shoulder and a flange are provided on the large end of the pressure head 2, and the shoulder depth δ1 and the flange distance δ2 are calculated according to the axial dimension chain.

[0076] Furthermore, the internal space of the sleeve 1 must be able to accommodate the gear shaft shoulder and must not interfere with it.

[0077] The pressure head 2 is equipped with a shoulder and a flange. The shoulder depth δ1 and the flange distance δ2 are calculated according to the axial dimension chain. The large end of the sleeve 1 is equipped with an internal spline, which mates with the external spline on the gear for centering. The fit between the sleeve 1 and the pressure head 2 is a clearance fit, ensuring that the sleeve 1 provides axial guidance to the pressure head 2 during use. The small end of the sleeve 1 is equipped with an external thread. The intelligent electric drive device 4 drives the nut 3 to screw in, so that the end face of the nut 3 fits against the small end face of the pressure head 2, thereby driving the pressure head 2. At the contact point between the pressure head 2 and the end face sealing ring, four pressure sensors 5 are evenly distributed circumferentially, ensuring that the stationary ring is pressed into the specified position that meets the preload during tool use.

[0078] Secondary invention point 1: It can realize dual axial centering and axial intelligent limiting functions during use.

[0079] Secondary invention point 2: The shoulder depth δ1 and the flange distance δ2 are calculated according to the axial dimension chain.

[0080] Secondary invention point 3: The large end of sleeve 1 is provided with an internal spline.

[0081] Secondary invention point 4: The fit between sleeve 1 and pressure head 2 is a clearance fit.

[0082] Secondary invention point 5: Sleeve 1 provides axial guidance for pressure head 2.

[0083] Secondary invention point 6: The intelligent electric drive device 4 drives the nut 3 to engage.

[0084] Secondary invention point 7: At the contact point between the pressure head 2 and the end face sealing ring, four pressure sensors 5 are evenly distributed circumferentially.

[0085] 1. This application combines the structural characteristics of gear and bearing housing assemblies to design a novel automatic installation tool for a double-centering intelligent limit end face sealing stationary ring. This tool can prevent oil leakage and sealing failure caused by end face misalignment, inadequate pressing, or excessive pressing preload during installation of the stationary ring.

[0086] 2. This application is simple to operate and easy to use, which can improve the efficiency of field maintenance.

[0087] 3. This application can achieve both dual axial centering during use and intelligent axial limit function.

[0088] Example 3 See Figure 4 This invention provides a method for using an intelligent limit end face sealing stationary ring automatic installation tool, which includes the following steps: Align and install the inner spline of sleeve 1 with the outer spline of the gear, and abut it against the shoulder of the gear shaft to ensure axial centering; Install the end face sealing stationary ring onto the shoulder of the pressure head 2, and adjust the stationary ring to ensure that its end face is in contact with the shoulder of the pressure head 2; After the above adjustments are completed, the intelligent electric drive device 4 drives the nut 3 to screw in, so that the pressure head 2 moves forward evenly along the sleeve 1 until the flange of the pressure head 2 is in contact with the end face of the bearing seat. At this point, the reading of the pressure sensor 5 at the contact point between the pressure head 2 and the end face sealing ring is used to determine whether the end face sealing ring has been installed in place.

[0089] Thus, the objective of this invention has been achieved.

[0090] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent limit end face sealing stationary ring automatic installation tool, used to press-fit the end face sealing stationary ring onto a gear assembly, characterized in that, include: Sleeve (1), the sleeve (1) has a stepped structure, and its large end is provided with an internal spline for meshing with the external spline on the gear to be installed, so as to achieve radial positioning; The pressure head (2) has a stepped structure and is coaxially sleeved on the outer periphery of the sleeve (1), and can slide axially relative to the sleeve (1); the large end of the pressure head (2) is provided with a shoulder for accommodating and abutting the end face sealing ring; A drive assembly is provided to provide driving force to drive the pressure head (2) to move axially along the sleeve (1) to perform a pressing action; The limit and control unit is used to provide axial limit and / or pressure feedback during the press-fitting process.

2. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 1, characterized in that, The driving component includes: The external thread is provided on the outer surface of the small end of the sleeve (1); Nut (3) that is adapted to the external thread; And an intelligent electric drive device (4), which is driven to connect with the nut (3) and is used to drive the nut (3) to rotate; when the nut (3) is screwed forward, its end face engages with the small end face of the pressure head (2), thereby pushing the pressure head (2) to move axially along the sleeve (1).

3. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 2, characterized in that, The limiting and control unit includes an axial mechanical limiting structure, specifically: The large end of the pressure head (2) is also provided with an annular retaining edge; The stop is configured to form a hard stop for the advance of the pressure head (2) when the pressure head (2) is driven forward to the point where the stop fits against the fixed end face of the bearing seat or gear assembly.

4. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 3, characterized in that, The depth δ1 of the shoulder and the distance δ2 from the flange to the large end face of the pressure head (2) are calculated based on the axial dimension chain of the gear, bearing seat, and end face sealing ring to ensure that when the flange is in contact with the fixed end face, the end face sealing ring is pressed to the set axial preload position.

5. The intelligent limit end face sealing stationary ring automatic installation tool according to any one of claims 1 to 4, characterized in that, The limiting and control unit includes a pressure sensing module; The pressure sensing module includes multiple pressure sensors (5), which are evenly distributed circumferentially on the end face of the large end of the pressure head (2) to detect the pressure distribution and / or pressure magnitude acting on the end face sealing ring in real time during the pressing process.

6. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 5, characterized in that, The intelligent electric drive device (4) is connected to the pressure sensing module and can automatically control the rotation of the nut (3) according to the pressure value fed back by the pressure sensor (5) to achieve closed-loop control of the pressing force.

7. The intelligent limit end face sealing stationary ring automatic installation tool according to claim 1, characterized in that, The sleeve (1) and the pressure head (2) are clearance fit, which allows the sleeve (1) to guide the axial movement of the pressure head (2) while allowing slight radial float to compensate for alignment errors.

8. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 1 or 7, characterized in that, The sleeve (1) has a reinforcing rib in the inner cavity of the small end to improve the structural rigidity of the sleeve (1).

9. The intelligent limiting end face sealing stationary ring automatic installation tool according to claim 1, characterized in that, The internal axial space of the sleeve (1) is configured to accommodate the shoulder of the gear to be installed, thus avoiding interference during installation.

10. A method for automatically installing an intelligent limiting end face sealing stationary ring using any one of claims 1-9, characterized in that, Includes the following steps: S1: Installation and positioning steps: Align and mesh the inner spline of the sleeve (1) with the outer spline of the gear, so that the large end face of the sleeve (1) abuts against the gear shaft shoulder, and complete the initial radial and axial positioning of the tool. S2: Static ring pre-setting step, place the end face sealing static ring in the shoulder of the large end of the pressure head (2), and adjust its position so that its end face is in contact with the bottom surface of the shoulder; S3: Drive pressing step, start the drive assembly, drive the press head (2) to move smoothly forward axially along the sleeve (1) and press the end face sealing ring toward the installation position; S4: Position determination step, the limit and control unit determines whether the end face sealing ring is pressed into place; wherein, the basis for position determination includes: the mechanical limit signal of the flange of the pressure head (2) contacting the end face of the bearing seat, and / or the pressure value detected by the pressure sensor (5) reaching the preset target range.

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