Efficient assembling device for high-pressure hydraulic plug

Abstract

The utility model belongs to the technical field of mechanical assembly, and particularly relates to an efficient assembly device for a high-pressure hydraulic plug. Comprising a mounting base (1), a guide bush (2) and a pressing pin (3), a part mounting hole D1 is formed in the end face of one end of the mounting base (1), and a guide step is arranged on the outer circle of the mounting base (1); an inner hole in one end of the guide bushing (2) is matched with the outer side of the guide step in a smooth fit manner, and a via hole D2 is formed in the other end of the guide bushing (2); one end of the pressing pin (3) is provided with a limiting step, and the other end plane of the pressing pin (3) is vertical to the axis; the outer circle of the guide step of the mounting base (1) is coaxial with the part mounting hole D1; an inner hole of the guide bushing (2) is coaxial with the via hole D2; in the assembling process, the blocking cup (5) is installed in the part installation hole D1, and the guide bush (2) is installed on the outer circle of the guide step of the installation base (1); the plug core (4) is installed in the via hole D2, and the plug core (4) is pressed into the plug cup (5) through one end of the pressing pin (3).

Description

Technical Field

[0001] This utility model belongs to the field of mechanical assembly technology, and in particular relates to a high-efficiency assembly device for high-pressure hydraulic plugs. Background Technology

[0002] Currently, the plugs that are pre-placed, positioned, and pressed into place using this device are single-structure components. Only the alignment between the part and the copper tube needs to be ensured; there is no control over the fit between the parts. The coaxiality of the cylindrical shape of the plug part with the copper tube opening is controlled by an internal steel ball. However, the elastic rubber of the non-metallic material is prone to changes in the alignment between the part and the tube opening under the radial compression of the steel ball, leading to insufficient coaxial alignment. The assembly process has low precision requirements and is cumbersome and inefficient. Furthermore, the device assembles the plug by applying force to it using a pin and piston rod. Due to the deformation of the non-metallic parts, the pin may become embedded in the part after pressing, potentially damaging the part.

[0003] Furthermore, the plugs currently designed for high-pressure testing methods to adapt to and resist sealing tests after assembly are also single-structure objects. They have a common sealing fit structure with the housing hole, and the parts are clearance fits. The sealing requirements between the plug and the housing hole are achieved by using two sealing rings. Utility Model Content

[0004] The purpose of this utility model is to provide a high-efficiency assembly device for high-pressure hydraulic plugs, solving the problems of inconvenient handling and low assembly efficiency of hydraulic plug parts due to their small geometric shape, as well as abnormal situations such as excessive pressing force, pressing damage, and inability to install the plug core during the assembly process due to low coaxiality control accuracy of the plug cup and plug core parts. These abnormal situations lead to plug assembly failure and sealing leakage failure in aviation hydraulic system products. The device aims to improve the assembly efficiency and quality of hydraulic plugs, ensure coaxiality control and parameter control during the assembly process, meet the assembly quality and efficiency requirements of matching plugs in hydraulic system products, and meet the assembly and testing verification needs of new plug research and development and technology exploration stages.

[0005] Technical solution:

[0006] A high-efficiency assembly device for high-pressure hydraulic plugs includes: a mounting base 1, a guide bushing 2, and a pressure pin 3, wherein...

[0007] One end face of the mounting base 1 is provided with a part mounting hole D1, and the outer circle of the mounting base 1 is provided with a guide step; the inner hole of one end of the guide bushing 2 is slidably matched with the outer circle of the guide step, and the other end of the guide bushing 2 is provided with a through hole D2; one end of the pressure pin 3 is provided with a limit step, and the plane of the other end of the pressure pin 3 is perpendicular to the axis; the outer circle of the guide step of the mounting base 1 and the part mounting hole D1 are coaxial; the inner hole of the guide bushing 2 is coaxial with the through hole D2;

[0008] During assembly, the plug cup 5 is inserted into the part mounting hole D1, the guide bushing 2 is installed onto the outer circle of the guide step of the mounting base 1, the plug core 4 is installed into the through hole D2, and the plug core 4 is pressed into the plug cup 5 through one end of the pressure pin 3.

[0009] Furthermore, a connection hole is provided at the other end of the mounting base 1.

[0010] Furthermore, the mounting base 1 is provided with a hexagonal structure.

[0011] Furthermore, the mounting hole D1 is a through hole, and a chamfered support shoulder is provided inside the through hole for axial positioning and centering of the plug cup 5.

[0012] Furthermore, the guide step of the mounting base 1 is located below the chamfered support shoulder.

[0013] Furthermore, the axial dimension of the limiting step of the pressure pin 3 is equal to the axial displacement of the plug core 4 into the plug cup 5.

[0014] Beneficial effects:

[0015] This utility model features a compact structure, convenient operation, excellent design, and good applicability. It can adapt to the design requirements of verification devices during the development of hydraulic plugs of different sizes and structures, as well as the coaxial assembly requirements during the assembly of plugs for hydraulic system products. Through the cooperation of a high-precision guide bushing and the functional guide step of the mounting base, the coaxiality of the plug core during press-fitting into the plug cup is ensured, preventing axial misalignment during plug core press-fitting into the plug cup, interference damage between parts or between parts and the base, and thus press-fitting failure. The internal cavity structure designed on the mounting base accommodates the slight increase in outer diameter caused by material deformation after the plug core is pressed into the plug cup, enabling convenient disassembly of the guide bushing. Furthermore, while meeting the basic assembly requirements of the plug, it can be easily connected to testing equipment (or testing fixtures), expanding its functionality.

[0016] By using this device, the coaxial alignment of the plug cup and plug core can be improved, the assembly efficiency and quality of the plug can be enhanced, and the testing requirements such as hydraulic pressure test and sealing test after plug assembly can be met simultaneously, thus expanding the scope of application of the device and creating beneficial effects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the device structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the mounting base 1 of this utility model.

[0019] Figure 3 This is a structural schematic diagram of the guide bushing 2 of this utility model.

[0020] Figure 4 This is a schematic diagram of the experimental connection of this utility model.

[0021] The components include: mounting base 1, guide bushing 2, pressure pin 3, plug core 4, plug cup 5, sealing ring 2′, and test interface device 3′. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0023] This invention primarily addresses the efficient assembly and testing of metal plugs with minute geometric structures featuring conical surfaces. By designing a high-precision guide bushing, it achieves coaxial alignment between the plug core and the plug cup component, eliminating the risk of altered coaxial alignment during the process. This improves the precision control of the assembly process. Furthermore, the internal structure design of the bushing prevents the bushing from jamming due to material deformation during plug assembly. Simultaneously, the invention utilizes a pressure pin structure to ensure uniform force on the end face of the plug core component during assembly, and the axial limiting structure of the pressure pin achieves mechanical restraint after pressing, avoiding the risk of over-pressing or damage to the surface quality of the component due to abnormal stress at a single point. Moreover, this invention allows for the picking, positioning, and installation of plugs and devices through manual or automated operation. It also features a threaded structure for connecting to testing equipment, improving the convenience of connecting assembly and testing processes, broadening its applicability, effectively reducing the labor intensity of operators, increasing production efficiency, and lowering production costs.

[0024] The technical solution of this utility model is to design a high-efficiency assembly and testing device that can accurately install, position, and axially guide plug parts. Specifically, a mounting base with guiding and positioning functions is designed, ensuring a precise fit between it and the guide bushing, improving the coaxial control accuracy between the two, and laying the foundation for coaxial alignment during the pre-assembly of plug cup and plug core parts. Furthermore, this base has the function of simulating the plug mounting hole of an aerospace hydraulic system product, which can meet the reliable installation requirements of the new plug cup part. A positioning plane with hexagonal nut structure is designed, realizing reliable axial positioning between the mounting base and the guide bushing, bearing the axial force acting on the guide bushing, avoiding direct action on the positioning plane of the mounting base, and preventing the potential impact on the plug assembly quality. A chamfered inner hole is also proposed. The proposed support shoulder structure meets the initial support and positioning requirements after the plug cup part is inserted into the mounting hole of the base. It absorbs the internal and external conical surface clamping forces and axial forces generated during assembly, preventing scratches on the mounting hole surface caused by axial movement of the part and its impact on the plug assembly quality. A high-precision guide bushing adapted to the mounting base was designed to provide axial guidance during the plug core press-fitting process into the plug cup, ensuring the coaxiality of the plug core and the plug cup and avoiding the misalignment caused by the circumferential instability of manually placed plug cores. A guide hole structure design with circumferential positioning was proposed, matching the conical surface characteristics of the plug core part, achieving circumferential positioning during the initial assembly process. Axial guidance is used to avoid the risk of unreliable positioning and guidance of the plug core or scratches on its surface during initial assembly, which could lead to problems with the fit of the inner and outer conical surfaces. A design scheme is proposed to facilitate easy disassembly of the tooling after the plug core is pressed into the plug cup. This involves designing a functional guide step on the mounting base and a cavity in the inner hole area of ​​the guide bushing to accommodate base deformation. Based on the vertical guidance and pre-assembly of the plug core into the plug cup, this design adapts to the circumferential dimensional changes of the mounting base after the plug core is pressed into the plug cup, avoiding the defects and shortcomings of difficult disassembly of the guide bushing after the plug core is pressed into the plug cup. A pressing pin structure with axial pressing and limiting function is also proposed, based on the protrusion of the plug core after pre-assembly into the plug cup and the guide hole of the guide bushing. The depth dimension and relative displacement relationship during the pressing process are considered. A mechanical limit step with a certain height is designed at the working end of the special pressing pin to meet the axial displacement requirements, realize axial displacement control, improve the accuracy control of the pressing process, and avoid pressing exceeding the limit and damage to the end face of the mounting base. A connection structure that meets the requirements for hydraulic testing after plug assembly is proposed. A connection end with a threaded connection structure and a sealing installation structure is designed at the end of the mounting base. After the plug assembly is completed, the device can be directly connected to the interface of the test equipment (or test fixture) through the threaded structure, and the connection is sealed by the sealing ring, which meets the test requirements such as hydraulic pressure test and sealing test verification.Ultimately, this device can not only complete the coaxial guidance and efficient assembly of the plug core pressing into the plug cup, but also be directly used for hydraulic testing after plug assembly, demonstrating excellent functionality and wide applicability.

[0025] During operation, the plug cup is pre-installed into the mounting hole of the mounting base. The guide bushing is vertically installed into the mounting base along the axis and slids into the functional guide step of the base to complete circumferential guidance and axial positioning. Then, the plug core is installed along the part guide hole on the guide bushing to complete the vertical pre-installation of the small end of the plug core and the hole of the plug cup. The parts and devices in this state are placed together on the worktable (or assembly worktable) of the precision servo press. The precision servo press is started, and the spindle equipped with the special pressing pin moves downward along the axis to contact the upper end face of the plug core. The initial pressing position is defined, and pressing parameters such as pressing force, pressing speed, and axial displacement are set. The program controls the application of force to the plug head along the axis until the axial displacement is completed. After the plug core is pressed into the plug cup, the press spindle is reset, the high-precision guide bushing is removed along the axis, and the assembly quality of the plug head is checked. The plug head assembly is complete.

[0026] To further verify whether the quality of the plug assembly meets the operating conditions requirements of aviation hydraulic system products, after the plug assembly and inspection are completed and found to be correct, the mounting base with the plug is connected to the interface of the test equipment (or test fixture) through a threaded structure. Then, the hydraulic pressure test and sealing test, including tests for rated pressure, withstand pressure, test pressure and pressure pulse, can be started.

[0027] The structure and specifications of this device can be parametrically designed according to the dimensions and structure of the hydraulic plug, improving its applicability. Simultaneously, the threaded connection structure expands its application range, allowing for simultaneous verification tests of the hydraulic plug. This reduces development costs and improves development and verification efficiency while meeting the requirements of new product development. A further detailed description of this utility model device is provided with specific examples, but this is not intended to limit the scope of the utility model.

[0028] The main technical protection points of this utility model include,

[0029] (1) A guide-type mounting base design is provided. Functional guide steps are designed on the mounting base to ensure precise fit with the guide bushing, achieve effective fit between the two, improve the coaxial control accuracy between the two, and lay the foundation for coaxial alignment during the pre-assembly of the plug cup and plug core parts. At the same time, mounting bases of different specifications are designed according to the geometry of the hydraulic plug to meet the reliable installation of the parts and the simulation of the plug mounting hole of the aviation hydraulic system product.

[0030] (2) The positioning function and load-bearing structure design of the mounting base propose a positioning plane with hexagonal nut structure features. When the guide bushing slides along the guide step of the mounting base, it accurately contacts the positioning plane, realizing the axial positioning between the mounting base and the guide bushing. At the same time, according to the force characteristics of the plug assembly process, after the plug core is pressed into the plug cup, the planar structure can be used to bear the force acting on the guide bushing, avoiding the axial force acting on the positioning plane of the mounting base through the guide bushing.

[0031] (3) The design scheme of the chamfered support shoulder of the inner hole of the base proposes a support shoulder structure with chamfered features. According to the geometric shape characteristics of the plug cup parts of different specifications, the geometric structure of the support shoulder is designed to meet the initial support positioning formed after the plug cup parts are installed into the mounting hole of the base. At the same time, during the process of pressing the plug core into the plug cup, the support shoulder bears the inner and outer conical surface pressing force and axial force generated during the pressing process, avoiding longitudinal scratches on the surface of the mounting hole caused by axial movement and the resulting plug sealing failure.

[0032] (4) Coaxial guide structure design scheme: A high-precision guide bushing adapted to the mounting base is designed. Based on the functional guide steps of the mounting base, the high-precision guide bushing is matched with the mounting base during installation. On the basis of ensuring reliable contact between the guide bushing and the positioning plane of the mounting base to achieve axial positioning, circumferential positioning is achieved through the cooperation between the two, ensuring the coaxiality of the split device, and thus ensuring the coaxiality of the plug cup and plug core during pre-installation.

[0033] (5) The design scheme of the circumferential positioning guide hole in the installation process of the plug core part: Based on the conical surface feature structure of the plug core part and its requirement for coaxial alignment during the press-fitting into the plug cup hole, a small hole matching the conical surface structure of the plug core is machined on the plane of the high-precision guide bushing. This realizes the circumferential positioning and axial guidance of the plug core part during the initial installation into the plug cup hole, avoiding the risk of unreliable positioning and guidance due to the small hole size (precision) being too large or the plug core being too small, causing the plug core to be stuck and scratching the outer surface of the part, resulting in the risk of the inner and outer conical surfaces matching after the plug core is press-fitted into the plug cup.

[0034] (6) Micro-deformation adaptation structure and design scheme of the base: A design scheme for easy disassembly of the tooling after the plug core is pressed into the plug cup is proposed. Based on the design scheme of the coaxial guide structure, according to the relationship between its axial positioning dimension with the mounting base, the circumferential fit dimension with the mounting base and the plug installation position, a cavity adapted to the deformation of the base is designed in the inner hole area of ​​the high-precision guide bushing. After the plug core is pre-installed into the plug cup, it can adapt to the micro-deformation of the mounting base after the plug core is fully pressed into the plug cup, avoiding the defects and shortcomings of the guide bushing being difficult to disassemble and decompose after the plug core is pressed into the plug cup.

[0035] (7) Axial press-fit limiting structure design: A press pin structure with axial press-fit limiting function is proposed. During the press-fitting of the plug core into the plug cup, based on the protrusion of the plug core after pre-installation into the plug cup, the depth of the guide bushing guide hole, and the displacement change relationship during the press-fitting process, a special press pin with mechanical limiting steps is designed to avoid the press-fitting force after press-fitting being directly applied to the end face of the mounting base, causing end face damage. At the same time, the mechanical limiting steps realize the control of axial press-fitting displacement, improve the accurate control of the press-fitting process, and avoid press-fitting exceeding the limit.

[0036] (8) A connection conversion structure design scheme for plug assembly verification and hydraulic test verification is proposed. A connection structure that meets the requirements of hydraulic test after plug assembly is proposed. A threaded structure and a sealing ring installation groove structure are designed at the end of the mounting base. This satisfies the convenience of the interface connection between the plug and the test equipment (or test tooling) after the plug is assembled to the mounting base, improves the convenience of the connection between the assembly process and the test process, and enhances the functionality and applicability of the device.

[0037] (9) This utility model uses a precision servo press to automatically apply axial force by setting process parameters such as pressing force and pressing speed on the basis of accurate pre-positioning of parts, thereby realizing the reliable and accurate pressing of the plug core into the plug cup and completing the plug assembly based on process parameter control.

[0038] (10) This utility model can also replace the precision servo press to apply force to the pressure pin by manual means. The device’s mechanical structure enables accurate positioning of the pre-assembly and pressing process of the plug parts, thus completing the efficient assembly of the plug.

[0039] To make the technical functions, objectives, and work benefits of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0040] (1) Plug assembly process

[0041] See Figures 1 to 4 The high-pressure hydraulic plug high-efficiency assembly device includes a mounting base 1, a guide bushing 2, a pressure pin 3, a plug core 4, and a plug cup 5.

[0042] Based on the installation requirements of hydraulic system products for plugs, and combined with the structural features and principles of this utility model, during the plug assembly process, the plug cup 5 is pre-installed into the D1 hole of the mounting base 1 to form initial support positioning with the chamfered support shoulder at the bottom of the hole. The guide bushing 2 is moved along the axial direction of the mounting base 1 and slides against the outer circle of its functional guide step to its positioning plane to complete axial and circumferential positioning. Then, the plug core 4 is installed into the D2 hole of the guide bushing 2, ensuring that it is coaxial with the plug cup 5. Through servo control, the pressure pin 3 is moved above the axis of the plug core 4 and contacts the upper end face of the plug core 4. After moving downwards coaxially to a specified displacement, it stops, realizing the pressure installation of the plug core into the plug cup, thus completing the plug assembly.

[0043] (2) Hydraulic pressure test and sealing test verification process after plug assembly

[0044] See Figure 4 The illustration of this utility model shows a mounting base 1, a sealing ring 2′, a test interface device 3′, a plug 4, and a plug cup 5.

[0045] According to the requirements of hydraulic pressure test and sealing test of hydraulic plug, and combined with the structural features and principle of this utility model, after the plug assembly is completed, the sealing ring 2′ is installed to the sealing groove position of the connecting end of the mounting base 1, and then tightened to the test interface device 3′ through the threaded structure of the connecting end of the mounting base 1.

[0046] The hydraulic pressure test method for the plug is to conduct a hydraulic test with specified parameters according to the requirements of hydraulic pressure test and sealing test. The working medium with the required test pressure is supplied to the P port of the device, and the specified test temperature, pressure waveform curve and other parameters are set. After the test pressure stabilizes, the timing is started. Within the specified time, check whether there is oil leakage at the plug installation end position (the mating surface between the plug cup 5 and the mounting base 1), whether the plug core 4 has abnormal axial displacement from the plug cup 5, and whether the mounting base 1 has abnormal deformation, etc., to confirm whether the plug assembly quality meets the operating conditions requirements of the aviation hydraulic system product.

Claims

1. A high-efficiency assembly device for high-pressure hydraulic plugs, characterized in that, include: Mounting base (1), guide bushing (2), and pressure pin (3), wherein, The mounting base (1) has a part mounting hole D1 on one end face and a guide step on the outer circle of the mounting base (1); the inner hole of the guide bushing (2) is slidably matched with the outer circle of the guide step, and the other end of the guide bushing (2) is provided with a through hole D2; the pressure pin (3) has a limit step on one end and the plane of the other end of the pressure pin (3) is perpendicular to the axis; the outer circle of the guide step of the mounting base (1) and the part mounting hole D1 are coaxial; the inner hole of the guide bushing (2) is coaxial with the through hole D2; During assembly, the plug cup (5) is inserted into the part mounting hole D1, and the guide bushing (2) is installed on the outer circle of the guide step of the mounting base (1); the plug core (4) is installed into the through hole D2, and the plug core (4) is pressed into the plug cup (5) through one end of the pressure pin (3).

2. The high-pressure hydraulic plug high-efficiency assembly device according to claim 1, characterized in that, The other end of the mounting base (1) is provided with a connection hole.

3. The high-pressure hydraulic plug high-efficiency assembly device according to claim 2, characterized in that, The mounting base (1) is provided with a hexagonal structure.

4. The high-pressure hydraulic plug high-efficiency assembly device according to claim 3, characterized in that, The mounting hole D1 is a through hole, and a chamfered support shoulder is provided inside the through hole for axial positioning and centering of the plug cup (5).

5. The high-pressure hydraulic plug high-efficiency assembly device according to claim 3, characterized in that, The guide step of the mounting base (1) is located below the chamfered support shoulder.

6. The high-pressure hydraulic plug high-efficiency assembly device according to claim 3, characterized in that, The axial dimension of the limiting step of the pressure pin (3) is equal to the axial displacement of the plug core (4) into the plug cup (5).

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