Piston wing core hanging protection tool
By designing a protective fixture for lifting the piston core, and using protective components made of alloy steel and stainless steel to wrap the core, the problem of easy damage to the sand core during lifting was solved, achieving stable and efficient lifting and transportation, and improving casting quality and production efficiency.
Patent Information
- Application Number
- CN202423028047.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-09
AI Technical Summary
The large area of the recessed area on the end face of the piston pin hole makes the sand core susceptible to external forces during hoisting, positioning and transportation, and it is also prone to friction and collision with the mold, resulting in sand core damage and scrap of core assembly, affecting the yield and casting quality.
Design a piston core lifting protective fixture, including upper and lower positioning sleeves, protective rods and locking rings. The core is wrapped with protective components made of alloy steel and stainless steel to ensure stability and protection during the lifting process and avoid friction and collision.
It effectively prevents core assembly from being damaged during hoisting and transportation, improves hoisting efficiency and quality, ensures production stability, and reduces core assembly scrap rate.
Smart Images
Figure CN223866155U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of piston core lifting protection technology, and in particular to a piston core lifting protection tooling. Background Technology
[0002] The engine piston is one of the key moving parts in an engine, and its performance directly affects the engine's operational stability and service life. The piston pin bore end face is typically designed to be 1.5-2mm recessed from the outer diameter. This design serves two important purposes: First, during the high-speed reciprocating motion of the piston within the engine cylinder, the presence of a lubricating oil film on the cylinder wall effectively prevents direct contact or scraping between the piston pin bore end face and the cylinder wall, reducing wear and extending the piston-cylinder wall mating life. Second, the recessed design also helps regulate the pressure balance of the gases inside and outside the cylinder during piston operation, preventing abnormal operation or damage caused by excessive pressure differences. This design principle is "easier to be large than small," meaning that internal pressure is more easily released, thus maintaining a stable operating state.
[0003] While this design offers significant functional advantages, it also presents several challenges, particularly during production and sand core assembly. The large concave area on the piston pin hole end face creates a weak point, making the sand core highly susceptible to external forces during hoisting, positioning, and transportation. Furthermore, this area often rubs against or bumps against the outer mold wall during hoisting, leading to sand core breakage or even scrapping of the core assembly, severely impacting the yield of sand cores and the subsequent casting quality. Utility Model Content
[0004] To overcome the above deficiencies, this utility model provides a piston core lifting protective fixture, which aims to improve the existing technology where the large area of the recessed area on the piston pin hole end face forms a weak link, making the sand core extremely susceptible to external forces during lifting, positioning and transportation. In addition, this area often rubs and bumps against the outer wall of the mold during the lifting process, which can lead to sand core damage or even scrapping of the core assembly.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A piston core lifting protective fixture includes a core assembly, and a protective component is provided on the outside of the core assembly;
[0007] The protective component includes an upper positioning sleeve, which is disposed on the upper part of the core assembly. A lower positioning sleeve is disposed on the lower part of the core assembly. Protective rods are inserted into the inner sides of the upper and lower positioning sleeves. A lower locking ring is disposed at the bottom of each of the multiple protective rods. Locking nuts are threadedly connected to the outside of each of the multiple lower locking rings. An upper center positioning pin is installed in the middle of the upper positioning sleeve.
[0008] Furthermore, the core assembly consists of ten sand cores.
[0009] Furthermore, the number of protective rods is four, evenly distributed between the upper positioning sleeve and the lower positioning sleeve.
[0010] Furthermore, the upper center positioning pin is used for center positioning of the core assembly to ensure the coaxiality of the core assembly in the protective fixture.
[0011] Furthermore, the protective rod is made of alloy steel.
[0012] Furthermore, both the upper positioning sleeve and the lower positioning sleeve are made of stainless steel.
[0013] This utility model has the following beneficial effects:
[0014] In this invention, during installation, after the core assembly is lifted by a crane, the upper positioning sleeve and the upper center positioning pin are installed. Then, four protective rods are inserted and their stability is checked. The height is adjusted to make the lower end moderate. The lower positioning sleeve is placed on the pad, and the lower end of the protective rod is inserted. The lower locking ring is installed and the locking nut is tightened. After adjusting the position of the protective rod, the tooling installation is completed. The crane lifts the core assembly and moves it above the middle box. After adjusting the position, it is slowly placed into the middle box. Then, the locking nut is loosened, and the lower locking ring, lower positioning sleeve, protective rod, upper center positioning pin, and upper positioning sleeve are disassembled to complete the disassembly. The protective tooling effectively prevents damage to the core assembly, improves lifting efficiency and quality, and ensures production stability. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the planar structure of a piston core lifting protective fixture proposed in this utility model;
[0016] Figure 2 This is a schematic diagram of the protective rod structure of a piston core lifting protective fixture proposed in this utility model;
[0017] Figure 3 This is a schematic diagram of the locking nut structure of a piston core lifting protective fixture proposed in this utility model.
[0018] Legend:
[0019] 1. Protective rod; 2. Upper positioning sleeve; 3. Lower positioning sleeve; 4. Upper center positioning pin; 5. Locking nut; 6. Lower locking ring; 7. Core assembly. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a piston core lifting protective fixture, including a core assembly 7. A protective component is provided on the outside of the core assembly 7. The protective component, by firmly wrapping the outside of the core assembly 7, serves as a buffer and isolation mechanism, effectively preventing the core assembly 7 from directly contacting other objects (such as the outer wall of the mold) during lifting, transportation, and assembly, and avoiding damage to the sand core due to friction or impact. The core assembly 7 consists of ten sand cores and is mainly used for casting the complex internal structure of the piston (such as the pin hole end face, cavity, etc.).
[0022] The protective assembly includes an upper positioning sleeve 2, which is located on the upper part of the core 7. A lower positioning sleeve 3 is located on the lower part of the core 7. Protective rods 1 are inserted into the inner sides of the upper and lower positioning sleeves 2 and 3. Each of the multiple protective rods 1 has a lower locking ring 6 at its bottom, and each of the multiple lower locking rings 6 is threaded with a locking nut 5. An upper center positioning pin 4 is installed in the middle of the upper positioning sleeve 2. There are four protective rods 1, evenly distributed between the upper and lower positioning sleeves 2 and 3. The upper center positioning pin 4 is used to center the core 7. Positioning is used to ensure the coaxiality of core 7 in the protective fixture. The protective rod 1 is made of alloy steel. The high toughness and good impact resistance of alloy steel can effectively absorb external impact forces and protect the sand core from damage. The upper positioning sleeve 2 and the lower positioning sleeve 3 are both made of stainless steel. Stainless steel has excellent corrosion resistance and can be used for a long time in humid, dusty or corrosive gas environments (such as foundry workshop environments) without rusting, ensuring the stability and service life of the upper positioning sleeve 2 and the lower positioning sleeve 3 in complex environments.
[0023] Specifically, after lifting the core assembly 7 with a crane, the upper positioning sleeve 2 needs to be installed on the upper part of the core assembly 7. During installation, it is necessary to ensure that the upper positioning sleeve 2 and the core assembly 7 are precisely aligned, and the upper center positioning pin 4 is inserted into the upper positioning sleeve 2 to achieve coaxial and concentric positioning of the upper positioning sleeve 2 and the core assembly 7, thereby ensuring balance and stability during the lifting process. Subsequently, the four protective rods 1 are inserted into the corresponding holes of the upper positioning sleeve 2 in sequence, ensuring that each protective rod 1 is firmly connected to the positioning sleeve. After installation, the firmness and positional accuracy of each protective rod 1 need to be checked one by one to ensure that there will be no loosening or displacement in subsequent operations. Next, the height of the crane is adjusted so that the lower end of the core assembly 7 is appropriately above the ground. In the middle stage, sufficient space is reserved for the installation of the lower positioning sleeve 3. A wooden block is placed on the ground to support and fix the lower positioning sleeve 3. After placing the lower positioning sleeve 3 on the wooden block, two people work together to insert the lower end of the protective rod 1 into the flat hole of the lower positioning sleeve 3, ensuring that the protective rod 1 is inserted smoothly and perpendicular to the positioning sleeve. After the insertion is completed, the lower locking ring 6 is installed and the locking nut 5 is tightened to make the lower end of the protective rod 1 firmly connected to the lower positioning sleeve 3. At this time, the position of the four protective rods 1 needs to be visually checked and adjusted to ensure that each protective rod 1 is vertical and the entire protective fixture is installed firmly and stably. After completing this series of operations, it can be confirmed that the fixture has been assembled and is ready for hoisting. After the tooling is installed, use a crane to slowly lift the core assembly 7, ensuring that it remains balanced and stable with the cooperation of the upper positioning sleeve 2 and the lower positioning sleeve 3. The crane operator should slowly move the core assembly 7 above the middle box, visually checking its position and orientation to ensure alignment. Once correctly positioned, use the crane to slowly lower the core assembly 7 and smoothly place it into the middle box, avoiding damage or misalignment due to excessive speed. After successfully placing the core assembly 7 into the middle box, the crane needs to lift the middle box again to disassemble the protective tooling. During this process, the operator should hold the lower positioning sleeve 3 and gradually loosen the locking nut 5, then remove the lower locking ring 6 and the lower... Positioning sleeve 3, then carefully pull out the four protective rods 1, taking care to avoid collisions with core assembly 7 or the middle box. After completing the lower disassembly, remove the upper center positioning pin 4 and the upper positioning sleeve 2 in sequence. At this point, the disassembly process of the protective fixture is complete. After using the protective fixture, the entire hoisting process of core assembly 7 achieves comprehensive safety and stability protection. Especially for the fragile sand core, the protective fixture effectively avoids damage to the core body caused by collisions, friction or shaking during hoisting and transportation, fundamentally solving the problem of high scrap rate of core assembly 7 in the past. At the same time, the fixture greatly improves the efficiency and quality of hoisting operations, reduces production stoppages and rework caused by damage to core assembly 7, and ensures the stability and efficiency of the production process.
[0024] Working Principle: During installation, after lifting the core assembly 7 with a crane, first install the upper positioning sleeve 2 onto the upper part of the core assembly 7, and insert the upper center positioning pin 4 into the upper positioning sleeve 2 to ensure that the upper positioning sleeve 2 and the core assembly 7 are coaxial and concentric. Then, insert the four protective rods 1 into the corresponding holes of the upper positioning sleeve 2 in sequence, and check their firmness and positional accuracy. Next, adjust the crane height so that the lower end of the core assembly 7 is at a moderate distance from the ground. Place wooden blocks on the ground, and place the lower positioning sleeve 3 on the blocks. With the cooperation of two people, insert the lower end of the protective rod 1 into the flat hole of the lower positioning sleeve 3, install the lower locking ring 6, and tighten the locking nut 5. Then, visually check the position of the four protective rods 1, adjust and align them to ensure that the overall fixture is installed and stable. After the installation is completed, lift the core assembly 7 with the crane and move it above the middle box. After visually checking and adjusting the position and posture of the core assembly 7 and the middle box, slowly and steadily place the core assembly 7 into the middle box. When the crane lifts the middle box, hold the lower positioning sleeve 3, loosen the locking nut 5 in sequence, remove the lower locking ring 6 and the lower positioning sleeve 3, pull out the four protective rods 1, and remove the upper center positioning pin 4 and the upper positioning sleeve 2 to complete the disassembly of the protective fixture. After using the protective fixture, the entire core assembly 7 lifting process is safely and stably protected, avoiding core damage caused by collisions during the lifting process, greatly improving the efficiency and quality of the core lifting operation, and ensuring the stability and efficiency of production.
[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A piston core lifting protective fixture, comprising a core assembly (7), characterized in that: The core (7) is provided with a protective component on its exterior; The protective assembly includes an upper positioning sleeve (2), which is located on the upper part of the core (7). A lower positioning sleeve (3) is located on the lower part of the core (7). Protective rods (1) are inserted into the inner sides of the upper positioning sleeve (2) and the lower positioning sleeve (3). A lower locking ring (6) is provided at the bottom of each of the multiple protective rods (1). Locking nuts (5) are threaded onto the outside of each of the multiple lower locking rings (6). An upper center positioning pin (4) is installed in the middle of the upper positioning sleeve (2).
2. The piston core lifting protective fixture according to claim 1, characterized in that: The core assembly (7) consists of ten sand cores.
3. The piston core lifting protective fixture according to claim 1, characterized in that: The number of the protective rods (1) is four, which are evenly distributed between the upper positioning sleeve (2) and the lower positioning sleeve (3).
4. The piston core lifting protective fixture according to claim 1, characterized in that: The upper center positioning pin (4) is used for center positioning of the core assembly (7) to ensure the coaxiality of the core assembly (7) in the protective fixture.
5. The piston core lifting protective fixture according to claim 1, characterized in that: The protective rod (1) is made of alloy steel.
6. The piston core lifting protective fixture according to claim 1, characterized in that: The upper positioning sleeve (2) and the lower positioning sleeve (3) are both made of stainless steel.