Axial floating type high-pressure ejector pin device

Abstract

The utility model discloses an axial floating type high-pressure ejector pin device, relates to the technical field of high-pressure ejector pin devices, and aims to solve the essential contradiction of rigid topology that a dynamic multi-physical field problem is simplified into a static mechanical model, and a synergistic effect mechanism of stress wave propagation, thermoelastic deformation and turbulence dissipation in a high-pressure system is ignored. According to the key points of the technical scheme, the ejector pin comprises a mounting pin sleeve, an ejector pin body is detachably connected to the interior of the mounting pin sleeve, an ejector pin head is fixedly connected to the upper end of the ejector pin body, a compression spring is fixedly connected to the interior of an insertion groove, and the compression spring is fixedly connected to the interior of the insertion groove. A pressing block is movably connected to the face, away from the inserting groove, of the pressing spring, a positioning pressing block is fixedly connected to the interior of the inserting groove, and a pressing ball and a clamping positioning block are clamped between the positioning pressing block and the ejector pin body. A local stress peak value is reduced to a material safety threshold value through elastic deformation, and fatigue crack initiation is effectively inhibited.

Description

Technical Field

[0001] This utility model relates to the technical field of high-pressure ejector devices, and in particular to an axially floating high-pressure ejector device. Background Technology

[0002] In high-pressure liquid transmission systems, the core defect of traditional rigid connection needle structures stems from the conflict between their rigid constraints and the physical laws of dynamic working conditions. The design violates the basic principle of "dynamic deformation-stress dissipation" in high-pressure fluid mechanics. When the high-pressure needle body is subjected to a pressure of over 1000 kilograms of fluid, the rigid fixation causes stress waves to be superimposed and reflected at the needle root, leading to irreversible propagation of material lattice distortion and fatigue cracks.

[0003] Fixed gap structures create scale effect contradictions in turbulent evolution. The inertial dominant flow generated by high-pressure fluid interacts with the rigid boundary, inducing vortex secondary flow and cavitation chain reaction. The instantaneous impact pressure generated by bubble collapse far exceeds the material's compressive strength limit, causing surface pitting and reduction of effective load-bearing area.

[0004] At the thermodynamic level, the 30-50°C temperature rise caused by the system's viscous dissipation leads to micron-level deformation mismatch between the needle body and the actuator due to the difference in their thermal expansion coefficients. This entropy increase process exceeds the sealing gap threshold, creating a self-destructive tendency through thermo-mechanical coupling. More importantly, the micron-level vibration-induced fretting wear and material stress corrosion form a positive feedback loop, accelerating the crack propagation rate and ultimately leading to brittle fracture.

[0005] The existing technical solutions mentioned above have the following drawbacks: the essential contradiction of this rigid topology lies in simplifying the dynamic multiphysics problem into a static mechanical model, ignoring the synergistic mechanism of stress wave propagation, thermoelastic deformation and turbulent dissipation in high-pressure systems, which has become a common technical bottleneck restricting the reliability of equipment under extreme working conditions. It is also inconvenient to install and position the equipment as a whole, and the overall stability after installation is generally poor. Utility Model Content

[0006] The purpose of this invention is to provide an axially floating high-pressure ejector pin device.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An axially floating high-pressure ejector pin device includes a mounting pin sleeve, inside which an ejector pin body is detachably connected. An ejector pin head is fixedly connected to the upper end of the ejector pin body. A slot is provided inside the mounting pin sleeve for the ejector pin body and the ejector pin head to be inserted. A compression spring is fixedly connected inside the slot. A compression block is movably connected to the side of the compression spring away from the slot. A positioning compression block is fixedly connected inside the slot. A compression ball and a locking positioning block are clamped between the positioning compression block and the ejector pin body.

[0009] By adopting the above technical solution, the ejector pin body is inserted into the slot. During the insertion process, the clamping block pushes the clamping spring to move upward, thereby ensuring that the clamping ball can be inserted into a more inward position and that the clamping ball is installed in place. At the same time, after installation, the middle clamping spring drives the clamping block to press down, ensuring that the clamping ball is stably installed and fixed.

[0010] Furthermore, the outer side of the ejector pin body is provided with a locking and fixing block that is pressed and positioned against the locking and positioning block. The upper inner wall cross-section of the positioning and pressing block is a funnel-shaped structure with a diameter decreasing from top to bottom.

[0011] By adopting the above technical solution, the positioning and pressing block with a funnel-shaped structure whose diameter decreases from top to bottom on the upper inner wall can form a locking structure with the protrusion of the locking positioning block after the locking positioning block is inserted, ensuring a good installation effect of the ejector pin body.

[0012] Furthermore, the clamping block is movably connected to the slot via a clamping spring, and the lower end face of the clamping block is adapted to the shape and size of the clamping ball.

[0013] By adopting the above technical solution, the clamping ball is used to push the clamping block, thereby limiting the installation of the ejector pin body. At the same time, the locking and positioning block is used to position and clamp the clamping ball, thereby ensuring a good overall installation effect.

[0014] Furthermore, the upper outer side of the engaging positioning block has a protruding structure, and the upper surface of the engaging positioning block is in contact with the pressing ball.

[0015] By adopting the above technical solution, the outer upper end of the locking and positioning block with a protruding structure can fit and fix with the inner wall of the positioning and pressing block, thereby ensuring that the locking and positioning block and the positioning and pressing block have a structure that abuts against each other during their strokes, increasing the force points of the ejector pin body and improving the overall installation effect.

[0016] Furthermore, a mounting groove for installing the clamping balls is reserved between the engaging positioning block and the clamping block, and the clamping balls are distributed in a ring at equal intervals inside the mounting groove.

[0017] By adopting the above technical solution, the clamping balls distributed in an annular pattern at equal intervals inside the mounting groove ensure overall installation, while the clamping spring drives the clamping block to clamp the clamping balls, thereby ensuring a good overall clamping and positioning effect.

[0018] In summary, the beneficial technical effects of this utility model are as follows:

[0019] 1. A multi-stage locking mechanism of conical surface and steel ball is adopted. Through the geometric coupling of arrayed micro steel balls and the conical section of the needle body, a locking force is formed in the axial direction, while the radial dynamic compensation gap is retained, so that the needle body has the ability to float axially. This design breaks through the rigid constraints of traditional thread / interference fit. When high-pressure fluid impacts, the needle body can adaptively displace within a limited range. Through elastic deformation, the local stress peak is reduced to the material safety threshold, effectively inhibiting the initiation of fatigue cracks.

[0020] 2. When impacted by thousands of kilograms of fluid, the needle body undergoes micron-level displacement. Through multi-directional sliding of the steel ball contact surface, concentrated stress is converted into contact friction power dissipation, achieving dynamic balance in conjunction with the surface coating. This mechanism reduces the fretting wear rate to 1 / 5 of that of traditional hard connections. Simultaneously, a preset wear compensation algorithm automatically adjusts the locking force, ensuring an effective improvement in the structure's service life.

[0021] 3. The needle body can be replaced by pressing the steel ball array with a special clamp (force > 50N), with an operation time of < 3 minutes. Compared with the traditional welding / threaded connection, the efficiency is improved by 80%, and the structure has passed the high-pressure dynamic sealing test. Attached Figure Description

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

[0023] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the mounting structure of the ejector pin of this utility model.

[0025] In the diagram, 1. Installation pin sleeve; 2. Ejector pin body; 3. Ejector pin head; 4. Slot; 5. Compression spring; 6. Compression block; 7. Positioning and pressing block; 8. Compression ball; 9. Engaging positioning block; 10. Engaging fixing block; 11. Installation groove. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Reference Figure 1An axially floating high-pressure ejector pin device includes a mounting pin sleeve 1, a ejector pin body 2 detachably connected inside the mounting pin sleeve 1, an ejector pin head 3 fixedly connected to the upper end of the ejector pin body 2, a slot 4 for inserting the ejector pin body 2 and the ejector pin head 3 inside the mounting pin sleeve 1, a compression spring 5 fixedly connected inside the slot 4, a compression block 6 movably connected to the side of the compression spring 5 away from the slot 4, a positioning compression block 7 fixedly connected inside the slot 4, and a compression ball 8 and a locking positioning block 9 clamped between the positioning compression block 7 and the ejector pin body 2. A multi-stage locking mechanism of conical surface and steel ball is adopted. Through the geometric coupling of the array of micro steel balls with the conical section of the pin body, a locking force is formed in the axial direction, while maintaining a radial dynamic compensation gap, enabling the pin body to have axial floating capability. This design breaks through the rigid constraints of traditional threaded / interference fits. When impacted by high-pressure fluid, the pin body can adaptively displace within a limited range, reducing the local stress peak to the material safety threshold through elastic deformation, effectively suppressing the initiation of fatigue cracks.

[0028] Reference Figure 2 The outer side of the ejector pin body 2 is provided with a locking and fixing block 10 that is pressed and positioned against the locking and positioning block 9. The upper inner wall cross section of the positioning and pressing block 7 is a funnel-shaped structure with the diameter decreasing from top to bottom. The positioning and pressing block 7 with the upper inner wall cross section having the diameter decreasing from top to bottom can fully abut against the locking and positioning block 9, increasing the overall force and ensuring the overall stability. The pressing block 6 is movably connected to the slot 4 through the pressing spring 5. The lower end face of the pressing block 6 is adapted to the shape and size of the pressing ball 8. The pressing spring 5 drives the pressing ball 8 to press down, ensuring that the positioning and pressing block 7 can fully abut against the locking and positioning block 9, increasing the overall stability after assembly.

[0029] Reference Figure 3 The upper outer side of the locking and positioning block 9 has a raised structure. The upper surface of the locking and positioning block 9 fits against the pressing ball 8. The raised structure on the upper outer side of the locking and positioning block 9 increases the resistance effect after overall stability, thereby ensuring that the ejector body 2 has multiple force points and reducing the possibility of overall breakage. An installation groove 11 is reserved between the locking and positioning block 9 and the pressing block 6 for the installation of the pressing ball 8. The pressing ball 8 is distributed in a ring at equal intervals inside the installation groove 11. The pressing ball 8 distributed in a ring at equal intervals inside the installation groove 11 can be fully pressed and positioned to ensure a good overall installation effect.

[0030] The implementation principle of this embodiment is as follows: First, insert the ejector head 3 and ejector body 2 into the slot 4. At the same time, push the clamping block 6 into the slot 4 using a tool. When the clamping block 6 enters the slot 4, it pushes the clamping spring 5 to a deeper depth in the slot 4, ensuring that the clamping block 6 is fully installed. When the clamping block 6 is installed in the slot 4, the clamping spring 5 presses the clamping block 6, so that the clamping block 6 fully contacts the ejector body 2. Then, push the clamping ball 8 into the slot 4 using a tool, and press the clamping spring 5 against the clamping block 6 to fully clamp and position the clamping ball 8. Finally, push the engaging positioning block 9 into the slot 4, so that the outer protrusion of the engaging positioning block 9 contacts and fixes against the positioning clamping block 7, and the inner side of the engaging positioning block 9 contacts and fixes against the engaging fixing block 10. This ensures that the ejector body 2 is well installed, increases the stress points of the ejector body 2, and reduces the probability of damage to the ejector body 2.

[0031] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An axially floating high-pressure ejector pin device, comprising a mounting needle sleeve (1), wherein an ejector pin body (2) is detachably connected inside the mounting needle sleeve (1), characterized in that: The upper end of the ejector pin body (2) is fixedly connected to the ejector pin head (3). The mounting pin sleeve (1) has a slot (4) for inserting the ejector pin body (2) and the ejector pin head (3). A compression spring (5) is fixedly connected inside the slot (4). A compression block (6) is movably connected to the side of the compression spring (5) away from the slot (4). A positioning compression block (7) is fixedly connected inside the slot (4). A compression ball (8) and a locking positioning block (9) are clamped between the positioning compression block (7) and the ejector pin body (2).

2. The axially floating high-pressure ejector pin device according to claim 1, characterized in that: The outer side of the ejector pin body (2) is provided with a locking and fixing block (10) that is pressed and positioned with the locking and positioning block (9). The upper inner wall of the positioning and pressing block (7) has a funnel-shaped structure with a diameter decreasing from top to bottom.

3. The axially floating high-pressure ejector pin device according to claim 1, characterized in that: The clamping block (6) is movably connected to the slot (4) via the clamping spring (5), and the lower end face of the clamping block (6) is adapted to the shape and size of the clamping ball (8).

4. The axially floating high-pressure ejector pin device according to claim 1, characterized in that: The upper outer side of the locking positioning block (9) has a protruding structure, and the upper surface of the locking positioning block (9) is in contact with the pressing ball (8).

5. The axially floating high-pressure ejector pin device according to claim 3, characterized in that: The locking positioning block (9) and the clamping block (6) have a reserved mounting groove (11) for the installation of the clamping balls (8), and the clamping balls (8) are distributed in a ring at equal intervals inside the mounting groove (11).

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