A lower ejector cylinder with automatic lubrication
Patent Information
- Application Number
- CN202522311843.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-31
AI Technical Summary
[0003]传统的下顶料气缸在长期使用过程中，普遍存在润滑依赖人工操作的缺点，由于气缸活塞轴与缸体之间、相关传动部件之间需要持续保持润滑以减少摩擦，传统技术下需要工作人员定期停机，手动拆解气缸外部防护结构后添加润滑油，这种方式不仅增加了人工劳动强度，还会因停机导致生产线中断，降低整体生产效率；同时，人工添加润滑油难以精准控制用量，易出现润滑不足或过量的情况，润滑不足会加剧部件磨损，过量则会造成润滑油浪费与环境污染，为此我们提出了一种带自动润滑的下顶料气缸
该带自动润滑的下顶料气缸，通过定位固定组件实现可靠连接，组件中滑块定位件与辅助弹簧配合，借助气缸主体的定位块与第一定位框的定位槽插接，再经滑块定位件穿定位滑腔与定位块固定孔连接，可牢牢锁定气缸主体与第一定位框，同时第一定位框和第二定位框四角通过螺栓固定，确保整体结构在运行中不易松动；同时润滑腔与滚珠槽连通，润滑油经进料口注入后，能顺畅流至滚珠槽包裹辅助滚珠，当气缸活塞轴往复滑动时，辅助滚珠滚动可将润滑油均匀涂抹在气缸活塞轴表面并形成稳定油膜，实现自动润滑，无需频繁人工添加润滑油，大幅降低维护工作量与人力成本；辅助滚珠与气缸活塞轴摩擦配合，将滑动摩擦转化为滚动摩擦，本身已能降低阻力，加之润滑油的润滑作用，进一步减小气缸活塞轴运动时的摩擦阻力，减少气缸活塞轴与相关部件的磨损，同时密封圈槽内的密封橡胶圈与润滑油进料口的防漏塞配合，可有效防止润滑油泄漏，保证润滑效果持久稳定，避免因润滑不足导致的部件损坏，最终显著提升气缸工作效率，延长气缸整体使用寿命。
Smart Images
Figure CN224835642U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of top-loading cylinder technology, specifically a bottom-loading cylinder with automatic lubrication. Background Technology
[0002] Lower ejector cylinders are commonly used actuators in industrial production. They are mainly used in automated production lines such as stamping, forging, and assembly to lift, push, or position workpieces. They are one of the key components to ensure the continuous and efficient operation of the production line. In actual production, the processing and transfer of workpieces often require precise and timely material position adjustment. With its fast response speed and stable output force, the lower ejector cylinder can quickly complete the ejection operation of the workpiece, avoiding the inefficiency caused by manual intervention. Therefore, the demand for lower ejector cylinders is increasing in industries such as automobile manufacturing, electronic component processing, and hardware product manufacturing. Its performance directly affects the production rhythm and product quality of the entire production line.
[0003] Traditional bottom-mounted cylinders generally suffer from the drawback of relying on manual lubrication during long-term use. Because the piston shaft and cylinder body, as well as related transmission components, require continuous lubrication to reduce friction, traditional methods necessitate periodic shutdowns to manually disassemble the cylinder's external protective structure and add lubricating oil. This not only increases labor intensity but also disrupts the production line, reducing overall production efficiency. Furthermore, manual lubrication makes precise control of the amount of lubricating oil required, easily leading to insufficient or excessive lubrication. Insufficient lubrication exacerbates component wear, while excessive lubrication wastes lubricating oil and causes environmental pollution. Therefore, we propose a bottom-mounted cylinder with automatic lubrication. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a bottom ejector cylinder with automatic lubrication, which solves the aforementioned problems.
[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a lower ejector cylinder with automatic lubrication, comprising: The cylinder body comprises a cylinder piston shaft, a first positioning frame, and a second positioning frame. The cylinder piston shaft is disposed inside one end of the cylinder body and is slidably engaged. One end of the cylinder body is provided with a first positioning frame, and one end of the first positioning frame is provided with a second positioning frame. The cylinder piston shaft is inserted through the inner sides of the second positioning frame and the first positioning frame. A lubrication cavity is provided between the first positioning frame and the second positioning frame. Multiple annularly distributed auxiliary balls are provided between the two, and the auxiliary balls are in frictional engagement with the cylindrical surface of the cylinder piston shaft. The positioning and fixing component, which is located on the inner side of the back of the first positioning frame, consists of a slider positioning component and an auxiliary spring, and is used to fix the connection between the cylinder body and the first positioning frame.
[0006] Preferably, the cylinder body has four symmetrically distributed positioning blocks on one end face of the cylinder piston shaft. The positioning blocks are rectangular and have fixing holes at their adjacent ends.
[0007] Preferably, the back of the first positioning frame is provided with four symmetrically distributed positioning grooves, and the four ends of the first positioning frame are provided with symmetrically distributed positioning sliding cavities. The positioning sliding cavities and the positioning grooves are interconnected. The first positioning frame is located at one end of the cylinder body located on the cylinder piston shaft, and the positioning block is inserted into the inside of the positioning groove.
[0008] Preferably, the slider positioning component has a slider on one side and an auxiliary spring at its end. The auxiliary spring and the slider positioning component are disposed inside the positioning cavity, and the slider passes through the first positioning frame and slides in cooperation with it. The front end of the slider positioning component passes through the positioning cavity and is fixedly connected to the fixing hole on the end face of the positioning block.
[0009] Preferably, the inner side of the end face where the first positioning frame and the second positioning frame are connected is provided with a plurality of annularly distributed ball grooves, the two ball grooves form a complete spherical shape, and auxiliary balls are rolled and installed on the inner side.
[0010] Preferably, a lubrication cavity is provided on the inner side of the end face where the first positioning frame and the second positioning frame are connected. The lubrication cavity is located outside the ball groove and is connected to the ball groove. A ring-shaped sealing groove is provided on the outer side of the lubrication cavity, and a sealing rubber ring is installed on the inner side of the sealing groove.
[0011] Preferably, the four corners of the first positioning frame and the second positioning frame are fixedly connected by bolts, and one end of the connection between the first positioning frame and the second positioning frame is provided with a lubricating oil inlet communicating with the lubrication cavity, and a leak-proof plug is inserted inside the lubricating oil inlet.
[0012] Compared with the prior art, this utility model provides a bottom ejector cylinder with automatic lubrication, which has the following advantages: This self-lubricated bottom-feeding cylinder achieves reliable connection through a positioning and fixing assembly. The assembly includes a slider positioning component that works with an auxiliary spring. The positioning block of the cylinder body is inserted into the positioning groove of the first positioning frame, and then the slider positioning component passes through the positioning cavity and connects to the fixing hole of the positioning block, firmly locking the cylinder body to the first positioning frame. Simultaneously, the four corners of the first and second positioning frames are fixed with bolts to ensure the overall structure is not easily loosened during operation. The lubrication chamber is connected to the ball groove. After lubricating oil is injected through the inlet, it flows smoothly into the ball groove to coat the auxiliary balls. When the cylinder piston shaft reciprocates, the rolling of the auxiliary balls evenly coats the surface of the cylinder piston shaft with lubricating oil. A stable oil film is formed on the surface, achieving automatic lubrication without the need for frequent manual addition of lubricating oil, significantly reducing maintenance workload and labor costs. The auxiliary ball bearings and cylinder piston shaft frictionally engage, converting sliding friction into rolling friction, which already reduces resistance. Combined with the lubricating oil, this further reduces the frictional resistance of the cylinder piston shaft during movement, reducing wear on the cylinder piston shaft and related components. At the same time, the sealing rubber ring in the sealing groove cooperates with the anti-leakage plug of the lubricating oil inlet to effectively prevent lubricating oil leakage, ensuring a long-lasting and stable lubrication effect, avoiding component damage caused by insufficient lubrication, and ultimately significantly improving cylinder working efficiency and extending the overall service life of the cylinder. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram showing the structural breakdown of this utility model; Figure 3 This is a cross-sectional view of the structure of this utility model; Figure 4 This is a schematic diagram of the first positioning frame structure of this utility model; Figure 5 This is a schematic diagram of the second positioning frame structure of this utility model.
[0014] In the diagram: 1. Cylinder body; 2. Cylinder piston shaft; 3. First positioning frame; 4. Slider positioning component; 5. Auxiliary spring; 6. Second positioning frame; 7. Sealing rubber ring; 8. Auxiliary ball; 9. Leakage plug; 10. Lubrication chamber; 11. Positioning block; 12. Positioning groove; 13. Positioning slide cavity; 14. Sealing ring groove; 15. Ball groove; 16. Lubricating oil inlet. Detailed Implementation
[0015] 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.
[0016] Please see Figure 1-5 A bottom ejector cylinder with automatic lubrication, comprising: The cylinder body 1, cylinder piston shaft 2, first positioning frame 3 and second positioning frame 6 are provided. The cylinder piston shaft 2 is located inside one end of the cylinder body 1 and is slidably engaged. One end of the cylinder body 1 is provided with the first positioning frame 3 and one end of the first positioning frame 3 is provided with the second positioning frame 6. The cylinder piston shaft 2 is inserted through the inner side of the second positioning frame 6 and the first positioning frame 3. A lubrication cavity 10 is opened between the first positioning frame 3 and the second positioning frame 6. Multiple annularly distributed auxiliary balls 8 are provided between the two. The auxiliary balls 8 are in frictional engagement with the cylindrical surface of the cylinder piston shaft 2. The positioning and fixing component is located on the inner side of the back of the first positioning frame 3. The positioning and fixing component consists of a slider positioning component 4 and an auxiliary spring 5, and is used to fix the connection between the cylinder body 1 and the first positioning frame 3.
[0017] Furthermore, the cylinder body 1 has four symmetrically distributed positioning blocks 11 on the end face of one end of the cylinder piston shaft 2. The positioning blocks 11 are rectangular and have fixing holes at their adjacent ends, providing a structural basis for the precise connection and fixation of the cylinder body 1 and the first positioning frame 3.
[0018] Furthermore, four symmetrically distributed positioning grooves 12 are provided on the back of the first positioning frame 3, and symmetrically distributed positioning sliding cavities 13 are provided at the four ends of the first positioning frame 3. The positioning sliding cavities 13 and the positioning grooves 12 are interconnected. The first positioning frame 3 is set at one end of the cylinder body 1 located at the cylinder piston shaft 2, and the positioning block 11 is inserted into the inside of the positioning groove 12, thereby realizing the initial accurate positioning of the first positioning frame 3 and the cylinder body 1 at the cylinder piston shaft 2 end.
[0019] Furthermore, a slider is provided on one side of the slider positioning component 4, and an auxiliary spring 5 is provided at its end. The auxiliary spring 5 and the slider positioning component 4 are located inside the positioning slide cavity 13, and the slider passes through the first positioning frame 3 and slides in cooperation. The front end of the slider positioning component 4 passes through the positioning slide cavity 13 and is fixedly connected to the fixing hole on the end face of the positioning block 11. The front end of the slider positioning component 4 passes through the positioning slide cavity 13 and is connected to the fixing hole on the end face of the positioning block 11, further securing and locking the first positioning frame 3 and the cylinder body 1.
[0020] Furthermore, multiple annularly distributed ball grooves 15 are provided on the inner side of the end face where the first positioning frame 3 and the second positioning frame 6 are connected. The two ball grooves 15 form a complete spherical shape, and auxiliary balls 8 are rolled on the inner side, which can frictionally cooperate with the cylindrical surface of the cylinder piston shaft 2, thus creating conditions for reducing the frictional resistance when the cylinder piston shaft 2 moves.
[0021] Furthermore, a lubrication cavity 10 is provided on the inner side of the end face where the first positioning frame 3 and the second positioning frame 6 are connected. The lubrication cavity 10 is located outside the ball groove 15 and is connected to the ball groove 15. A ring-shaped sealing groove 14 is provided on the outer side of the lubrication cavity 10. A sealing rubber ring 7 is installed on the inner side of the sealing groove 14 to provide space for the storage of lubricating oil and its flow to the ball groove 15, and to prevent the lubricating oil from leaking.
[0022] Furthermore, the four corners of the first positioning frame 3 and the second positioning frame 6 are fixedly connected by bolts, and one end of the connection between the first positioning frame 3 and the second positioning frame 6 is provided with a lubricating oil inlet 16 that communicates with the lubrication cavity 10. The lubricating oil inlet 16 is fitted with a leak-proof plug 9, which not only ensures that the two positioning frames are tightly connected, but also facilitates the replenishment of lubricating oil and prevents leakage.
[0023] Structural Description: Cylinder body 1: It is the basic load-bearing structure of the cylinder. One end is internally for sliding cooperation with the cylinder piston shaft 2. The end face is provided with four axisymmetric rectangular positioning blocks 11 with fixing holes, which are used to accurately connect with the first positioning frame 3 and provide installation support for the whole component. Cylinder piston shaft 2: It is inserted inside the cylinder body 1, the first positioning frame 3 and the second positioning frame 6, and slides with the cylinder body 1. It can slide back and forth to realize the material ejection action. It frictionally engages with the auxiliary ball 8 and relies on the lubrication system to reduce the movement resistance. First positioning frame 3: Located at one end of cylinder body 1, with four positioning grooves 12 on the back that cooperate with positioning block 11, and positioning slide cavities 13 at the four ends with slider positioning component 4 and auxiliary spring 5 installed inside, and one end connected to second positioning frame 6, together supporting piston shaft and constructing lubrication structure. Slider positioning component 4: It has a slider on one side and an auxiliary spring 5 at the end. It is located in the positioning slide cavity 13. The slider passes through the first positioning frame 3 and slides in fit. The front end passes through the positioning slide cavity 13 and connects to the fixing hole of the positioning block 11 to achieve a stable lock between the cylinder body 1 and the first positioning frame 3. Auxiliary spring 5: It is installed in the positioning cavity 13 in cooperation with the slider positioning component 4. It pushes the slider positioning component 4 with its own elastic force so that its front end can be stably inserted into the fixing hole of the positioning block 11, ensuring the reliable realization of the positioning function of the slider positioning component 4. The second positioning frame 6 is connected to the first positioning frame 3. The cylinder piston shaft 2 is inserted inside. The inner side of the end face is provided with a ball groove 15 with auxiliary balls 8 and a lubrication cavity 10. The four corners are fixed to the first positioning frame 3 by bolts, which together form a lubrication system and a piston shaft support structure. Sealing rubber ring 7: Installed inside the sealing ring groove 14. The sealing ring groove 14 is located outside the lubrication chamber 10. It can seal the lubrication chamber 10, prevent the lubricating oil in the chamber from leaking, and ensure that the lubrication system can continuously provide lubrication to the auxiliary ball 8 and piston shaft. Auxiliary ball 8: Rollingly installed in the ball groove 15 of the first and second positioning frames, it frictionally engages with the cylindrical surface of the cylinder piston shaft 2, converting sliding friction into rolling friction, reducing the movement resistance of the piston shaft, and assisting in the transmission of lubricating oil; Leak-proof plug 9: It is snapped into the inside of the lubricating oil inlet 16, which is connected to the lubrication chamber 10. When there is no need to add lubricating oil, the leak-proof plug 9 can seal the inlet to prevent the lubricating oil in the lubrication chamber 10 from leaking and to ensure the lubrication effect. Lubrication chamber 10: It is located inside the connecting end face of the first and second positioning frames, outside the ball groove 15 and connected to it. It is used to store lubricating oil and can deliver lubricating oil to the ball groove 15 to provide lubrication medium for the auxiliary ball 8 and cylinder piston shaft 2. Positioning block 11: Located on the corresponding end face of the cylinder body 1, it is in the form of four axisymmetric rectangles with fixing holes at adjacent ends, and can be inserted into the positioning groove 12 of the first positioning frame 3, providing a preliminary positioning and fixing basis for the connection between the cylinder body 1 and the first positioning frame 3; Positioning groove 12: It is opened on the back of the first positioning frame 3 and is distributed symmetrically on four axes. It matches the positioning block 11 of the cylinder body 1. The positioning block 11 is inserted into it to achieve the initial accurate positioning of the first positioning frame 3 and the cylinder body 1 at the piston shaft end. Positioning cavity 13: It is opened at the four ends of the first positioning frame 3, symmetrically distributed and connected to the positioning groove 12. The slider positioning component 4 and the auxiliary spring 5 are installed inside, providing installation space for the two, and allowing the slider positioning component 4 to slide to achieve the positioning function. Sealing groove 14: It is formed on the outside of the lubrication cavity 10 and is distributed in a ring. It is used to install the sealing rubber ring 7. By accommodating the sealing rubber ring 7, it provides a fixed position for it, ensuring that the sealing rubber ring 7 can effectively seal the lubrication cavity 10 and prevent oil leakage. Ball grooves 15: Multiple annularly distributed on the inner side of the connecting end face of the first and second positioning frames, the grooves of the two positioning frames form a complete sphere, used for rolling installation of auxiliary balls 8, providing a stable rolling trajectory for the auxiliary balls 8, and ensuring their cooperation with the piston shaft; Lubricating oil inlet 16: It is located at one end of the connection between the first and second positioning frames and communicates with the lubrication chamber 10. Lubricating oil can be injected into the lubrication chamber 10 through this inlet. The anti-leakage plug 9 is inserted inside, which can facilitate oil replenishment and prevent lubricating oil leakage when not replenishing oil.
[0024] Working principle: First, the cylinder piston shaft 2 is located inside one end of the cylinder body 1, forming a sliding fit. To further enhance the support and positioning of the cylinder piston shaft 2, a first positioning frame 3 is provided at one end of the cylinder body 1 located at the cylinder piston shaft 2, and a second positioning frame 6 is installed at one end of the first positioning frame 3. The cylinder piston shaft 2 passes through the inner sides of the first positioning frame 3 and the second positioning frame 6. The three together constitute the core motion and positioning frame of the cylinder. The positioning and fixing component ensures the stability of the connection between the components. This component consists of a slider positioning component 4 and an auxiliary spring 5, and is located on the inner side of the back of the first positioning frame 3. This is used to fix the connection between the cylinder body 1 and the first positioning frame 3. Specifically, during the connection, the cylinder body 1 has four symmetrically distributed rectangular positioning blocks 11 on the end face of one end of the cylinder piston shaft 2, and fixing holes are opened at adjacent ends of the positioning blocks 11. Correspondingly, the back of the first positioning frame 3 has four symmetrically distributed positioning grooves 12, and the four ends also have symmetrically distributed positioning sliding cavities 13 that communicate with the positioning grooves 12. When the first positioning frame 3 is installed at the corresponding end of the cylinder body 1, the positioning blocks 11 are inserted into the positioning grooves 12. At this time, the slider on one side of the slider positioning component 4 and the auxiliary spring 5 at the end are placed together in the positioning position. Inside the sliding cavity 13, the slider passes through the first positioning frame 3 and forms a sliding fit. Under the elastic force of the auxiliary spring 5, the front end of the slider positioning piece 4 passes through the positioning sliding cavity 13 and is fixedly connected to the fixing hole on the end face of the positioning block 11, thereby firmly locking the first positioning frame 3 and the cylinder body 1. To achieve the lubrication function, multiple annularly distributed ball grooves 15 are opened on the inner side of the end face where the first positioning frame 3 and the second positioning frame 6 are connected. Two ball grooves 15 combine to form a complete spherical shape, and auxiliary balls 8 are rolled on the inner side. The auxiliary balls 8 form a friction fit with the cylindrical surface of the cylinder piston shaft 2, which can reduce the friction during piston shaft movement. The frictional resistance is reduced, and a lubrication cavity 10 is also opened on the inner side of the connection end face of the two. The lubrication cavity 10 is located outside the ball groove 15 and is interconnected with the ball groove 15, providing space for the storage and flow of lubricating oil. To prevent lubricating oil leakage, a ring-shaped sealing groove 14 is opened on the outer side of the lubrication cavity 10, and a sealing rubber ring 7 is installed on the inner side. Furthermore, a lubricating oil inlet 16 communicating with the lubrication cavity 10 is opened at one end of the connection between the first positioning frame 3 and the second positioning frame 6, and a leak-proof plug 9 is snapped in inside. In addition, the four corners of the first positioning frame 3 and the second positioning frame 6 are fixedly connected by bolts to ensure that the lubrication system components are tightly connected.During cylinder operation, when lubricating oil needs to be replenished, the leak-proof plug 9 at the lubricating oil inlet 16 is opened, and lubricating oil is injected. The lubricating oil enters the lubrication chamber 10 through the inlet. Since the lubrication chamber 10 is connected to the ball groove 15, the lubricating oil flows into the ball groove 15 and wraps around the auxiliary balls 8. When the cylinder piston shaft 2 reciprocates within the cylinder body 1, the auxiliary balls 8 roll accordingly. The lubricating oil on the surface of the balls is evenly coated on the cylindrical surface of the cylinder piston shaft 2. At the same time, the friction between the balls and the piston shaft also causes the lubricating oil to form a stable oil film on the contact surface, achieving automatic lubrication of the cylinder piston shaft 2. The leak-proof plug 9 in the sealing ring groove 14 effectively prevents the lubricating oil in the lubrication chamber 10 and the ball groove 15 from leaking, ensuring a long-lasting and stable lubrication effect, thereby improving the cylinder's working efficiency and service life.
[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A bottom ejector cylinder with automatic lubrication, characterized in that, include: The cylinder body (1), cylinder piston shaft (2), first positioning frame (3) and second positioning frame (6) are provided. The cylinder piston shaft (2) is located inside one end of the cylinder body (1) and is slidably fitted. One end of the cylinder body (1) is provided with a first positioning frame (3), and one end of the first positioning frame (3) is provided with a second positioning frame (6). The cylinder piston shaft (2) is inserted through the inner side of the second positioning frame (6) and the first positioning frame (3). A lubrication cavity (10) is opened between the first positioning frame (3) and the second positioning frame (6). Multiple ring-shaped auxiliary balls (8) are arranged between them. The auxiliary balls (8) are in frictional fit with the cylindrical surface of the cylinder piston shaft (2). The positioning and fixing component is set on the inner side of the back of the first positioning frame (3). The positioning and fixing component consists of a slider positioning component (4) and an auxiliary spring (5) and is used to fix the connection between the cylinder body (1) and the first positioning frame (3).
2. The lower ejector cylinder with automatic lubrication according to claim 1, characterized in that, The cylinder body (1) has four symmetrically distributed positioning blocks (11) on the end face of one end of the cylinder piston shaft (2). The positioning blocks (11) are rectangular and have fixing holes at their adjacent ends.
3. A lower ejector cylinder with automatic lubrication according to claim 1, characterized in that, The back of the first positioning frame (3) is provided with four symmetrically distributed positioning grooves (12), and the four ends of the first positioning frame (3) are provided with symmetrically distributed positioning sliding cavities (13). The positioning sliding cavities (13) and the positioning grooves (12) are interconnected. The first positioning frame (3) is located at one end of the cylinder body (1) located on the cylinder piston shaft (2), and the positioning block (11) is inserted into the inside of the positioning groove (12).
4. A lower ejector cylinder with automatic lubrication according to claim 1, characterized in that, The slider positioning component (4) has a slider on one side and an auxiliary spring (5) at its end. The auxiliary spring (5) and the slider positioning component (4) are located inside the positioning cavity (13). The slider passes through the first positioning frame (3) and slides in cooperation. The front end of the slider positioning component (4) passes through the positioning cavity (13) and is fixedly connected to the fixing hole on the end face of the positioning block (11).
5. A lower ejector cylinder with automatic lubrication according to claim 1, characterized in that, Multiple annularly distributed ball grooves (15) are provided on the inner side of the end face where the first positioning frame (3) and the second positioning frame (6) are connected. The two ball grooves (15) form a complete spherical shape, and auxiliary balls (8) are rolled on the inner side.
6. A lower ejector cylinder with automatic lubrication according to claim 5, characterized in that, Lubrication chambers (10) are provided on the inner side of the end face where the first positioning frame (3) and the second positioning frame (6) are connected. The lubrication chambers (10) are located outside the ball groove (15) and are connected to each other. A ring-shaped sealing groove (14) is provided on the outer side of the lubrication chamber (10), and a sealing rubber ring (7) is installed on the inner side of the sealing groove (14).
7. A lower ejector cylinder with automatic lubrication according to claim 6, characterized in that, The four corners of the first positioning frame (3) and the second positioning frame (6) are fixedly connected by bolts, and one end of the connection between the first positioning frame (3) and the second positioning frame (6) is provided with a lubricating oil inlet (16) that communicates with the lubrication cavity (10). A leak-proof plug (9) is snapped into the inside of the lubricating oil inlet (16).