Air cylinder locking mechanism
The combined structure of the anti-rotation locking washer and the locking joint solves the problem of loose connection between the cylinder piston rod and the movable plate, achieves a stable and reliable connection, avoids loosening caused by return impact and rotation, and ensures the normal operation and equipment life of the molding machine.
Patent Information
- Application Number
- CN202422089499.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In the prior art, the connection between the cylinder piston rod and the movable plate is easily loosened during frequent extension and retraction movements, resulting in position changes, affecting the normal operation of the molding machine and the life of the equipment.
A combined structure of an anti-rotation locking washer and a locking joint is adopted. The small diameter section of the piston rod is connected to the thread of the locking joint, and the anti-rotation locking washer is tightly attached to the inner side of the movable plate. The three are connected into one with a locking bolt to prevent loosening and rotation.
A stable connection between the cylinder piston rod and the movable plate is achieved, loosening due to return impact and rotation is avoided, the uniqueness of the position and the reliability of the connection are ensured, the structure is simple and space-saving.
Smart Images
Figure CN223306057U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a cylinder locking mechanism, belonging to the technical field of powder metallurgy equipment. Background Art
[0002] In powder metallurgy equipment, the molding machine mainly applies huge pressure to the powder through the hydraulic system or mechanical pressure system of the machine, so that it is compressed and molded in the mold, and maintains a certain pressure for a period of time to ensure that the powder material forms a stable molding structure in the mold.
[0003] When the upper punch reaches the bottom dead center position on the forming machine, the upper punch pressure holding function will be activated, that is: when the upper slider drives the corresponding fixed plate to return upward, the cylinder piston rod extends out of the movable plate to keep the upper punch stationary, and the cylinder body and the fixed plate return upward. When they reach a certain position, the cylinder piston rod drives the movable plate to retract, and the movable plate returns upward to contact the fixed plate (there will be a certain impact between the movable plate and the fixed plate during the return).
[0004] In the prior art, the connection between the cylinder piston rod and the movable plate mostly adopts a nut tightening structure or a stop screw structure. During frequent extension and retraction movements, the connection between the cylinder piston rod and the movable plate will become loose; and the piston rod may produce slight rotation in the axial direction. Once rotation occurs, the thread between the cylinder piston rod and the movable plate will loosen, and the position of the movable plate and the cylinder will change, thereby causing other functions to fail or even abnormal damage. Therefore, a connection device with a simple structure, small space occupancy, and the ability to ensure long-term locking in the moving state is needed to ensure that the position of the cylinder piston rod and the connected movable plate does not change. Utility Model Content
[0005] The purpose of the utility model is to provide a cylinder locking mechanism to prevent the connection between the cylinder piston rod and the movable plate from loosening during the upward punching and pressure maintaining process of the forming machine, and to ensure that the position of the cylinder piston rod and the connected movable plate does not change.
[0006] The technical solution of the utility model is as follows: A cylinder locking mechanism, characterized by comprising: a cylinder body, a piston rod, a fixed plate, a movable plate, an anti-rotation locking washer, a locking joint, and a locking bolt; the piston rod is a stepped shaft, comprising a large-diameter section connected to the piston and a small-diameter section connected to the large-diameter section; the fixed plate is mounted on the front end surface of the cylinder body, and the fixed plate is provided with a through hole A for the piston rod to pass through;
[0007] The movable plate is provided with a through hole B, the locking joint is placed in the through hole B, and the center hole of the locking joint is provided with an internal thread, the small diameter section of the piston rod is provided with an external thread, and the small diameter section of the piston rod and the center hole of the locking joint are threadedly connected; the anti-rotation locking gasket is placed on the end of the large diameter section of the piston rod, and the locking bolt passes through the locking joint, the movable plate, and the anti-rotation locking gasket in sequence to connect the three into one.
[0008] The cam is secured to the piston rod by means of a locking bolt which connects the piston rod, the cam, and the locking plate to the cam, and the cam is secured to the piston rod by means of a locking bolt which connects the piston rod, the cam, and the locking plate to the cam.
[0009] Furthermore, the central hole wall of the anti-rotation locking washer is formed by four staggered flat surfaces and four smoothly connected circular arc surfaces; the side wall of the end of the large-diameter section of the piston rod matches the central hole wall of the anti-rotation locking washer (i.e., the outer wall of the end of the large-diameter section of the piston rod near the small-diameter section is also formed by four staggered flat surfaces and four smoothly connected circular arc surfaces). The four flat surfaces form a square frame around the central hole of the anti-rotation locking washer, making it less likely for the anti-rotation locking washer to rotate relative to the piston rod; the four circular arc surfaces eliminate the four sharp corners of the square frame, dispersing the stress between the anti-rotation locking washer and the piston rod.
[0010] Furthermore, the wall of through hole A in the fixed plate is provided with a stepped surface that matches the anti-rotation locking washer. The stepped surface in the wall of through hole A matches the shape of the anti-rotation locking washer. When the cylinder piston rod drives the movable plate to retract, the anti-rotation locking washer can be placed in through hole A without interfering with the contact between the fixed plate and the movable plate. The wall of through hole B and the outer side wall of the locking joint are respectively provided with mating stepped surfaces. The stepped surface of through hole B and the stepped surface of the locking joint match and limit each other, and the locking joint does not extend beyond the outer side surface of the movable plate.
[0011] Furthermore, the anti-rotation locking washer has four evenly distributed threaded holes (evenly distributed along the circumference of the center hole), the locking joint has a stepped through-hole that matches the locking bolt (matching the head of the locking bolt), and the movable plate has a through-hole C at a position corresponding to the stepped through-hole. The locking bolt passes through the stepped through-hole of the locking joint and through-hole C of the movable plate, and then is threadedly connected to the threaded hole of the anti-rotation locking washer. This design further ensures a secure connection between the piston rod and the movable plate, effectively connecting the related components and preventing relative rotation between the piston rod and the movable plate.
[0012] The utility model has a simple and reasonable structure and is easy to manufacture. While ensuring a reliable and stable connection, the structure is optimized, space is saved, the locking effect is good, and the device does not loosen during movement. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a structural diagram of the utility model (the cylinder piston rod drives the movable plate to retract);
[0014] Figure 2 This is a structural diagram of the utility model (the cylinder piston rod drives the movable plate to extend);
[0015] Figure 3 This is a schematic diagram of the structure of the piston rod in the utility model (with a piston);
[0016] Figure 4 It is a top view of the anti-rotation locking washer in the utility model;
[0017] Figure 5 for Figure 4 sectional view of
[0018] Figure 6 It is a top view of the locking connector in the present invention;
[0019] Figure 7 for Figure 6 sectional view of
[0020] Figure 8 This is a schematic structural diagram of the fixing plate in the present utility model;
[0021] Figure 9 It is a structural diagram of the movable plate in the utility model;
[0022] In the figure: cylinder body 1, piston rod 2, large diameter section 2-1, small diameter section 2-2, flat surface 2-3, arc surface 2-4, fixed plate 3, through hole A 3-1, movable plate 4, through hole B 4-1, through hole C 4-2, anti-rotation locking washer 5, flat surface 5-1, arc surface 5-2, threaded hole 5-3, locking joint 6, center hole 6-1, stepped through hole 6-2, locking bolt 7, piston 8. DETAILED DESCRIPTION
[0023] A cylinder locking mechanism comprises: a cylinder body 1, a piston rod 2, a fixed plate 3, a movable plate 4, an anti-rotation locking washer 5, a locking joint 6, and a locking bolt 7.
[0024] like Figure 3 As shown, the piston rod 2 adopts a stepped shaft, including a large diameter section 2-1 connected to the piston 8 and a small diameter section 2-2 connected to the large diameter section. The large diameter section of the piston rod is near the end of the small diameter section, and its outer side wall is formed by four staggered flat surfaces 2-3 and four arc surfaces 2-4 that are smoothly connected. The small diameter section of the piston rod is provided with an external thread.
[0025] like Figure 8 As shown, the fixing plate 3 is installed on the front end surface of the cylinder body 1, and the fixing plate is provided with a through hole A 3-1 for the piston rod to pass through. The step surface provided in the wall of the through hole A matches the shape of the anti-rotation locking gasket, so that when the cylinder piston rod is retracted, the anti-rotation locking gasket is placed in the through hole A and does not extend beyond the outer surface of the fixing plate.
[0026] like Figure 9 As shown, the movable plate 4 is provided with a through hole B 4-1, and the hole wall of the through hole B and the outer side wall of the locking joint are respectively provided with step surfaces that cooperate with each other. The movable plate is also provided with a through hole C 4-2, and the through hole C corresponds one-to-one with the step through hole of the locking joint and the threaded hole of the anti-rotation locking gasket.
[0027] like Figure 4 、 Figure 5 As shown, the anti-rotation locking gasket 5 has a center hole wall formed by four staggered flat surfaces 5-1 and four arc surfaces 5-2 smoothly connected to form a square frame, which matches the corresponding position of the large diameter section of the piston rod; the anti-rotation locking gasket is provided with four threaded holes 5-3 evenly distributed along the circumference of the center hole.
[0028] like Figure 6 、 Figure 7 As shown, the locking joint 6 is placed in the through hole B, and the center hole 6-1 of the locking joint is provided with an internal thread, and the small diameter section of the piston rod and the center hole of the locking joint are connected by threads; the locking joint is provided with a stepped through hole 6-2 that matches the head of the locking bolt.
[0029] When installing, if Figure 1 、 2 As shown:
[0030] The cylinders are arranged in pairs, with one movable plate and one fixed plate. The cylinder body is fixed to the fixed plate, and the piston rod is extended. An anti-rotation locking washer is inserted into the end of the large diameter section of the piston rod. The inner hole of this washer is a square frame, which matches the corresponding position on the piston rod.
[0031] Place a movable plate under the anti-rotation locking washer, pass the small diameter section of the piston rod through the movable plate, screw the locking joint into the lower part of the piston rod, place the locking joint in the through hole B of the movable plate, and make the end face of the locking joint close to the movable plate. Align the stepped through hole on the locking joint with the through hole C on the movable plate and the threaded hole on the anti-rotation locking washer, and then lock it with the locking bolt;
[0032] At this time, the locking joint, movable plate, anti-rotation locking washer and piston rod are tightly fixed together, and all parts cannot produce rotational movement independently. The positions of the piston rod and movable plate in the vertical direction are unique and will not change.
Claims
1. A cylinder locking mechanism, characterized in that: include: Cylinder body, piston rod, fixed plate, movable plate, anti-rotation locking washer, locking joint, locking bolt; The piston rod is a stepped shaft, comprising a large diameter section connected to the piston and a small diameter section connected to the large diameter section; the fixing plate is mounted on the front end surface of the cylinder body, and the fixing plate is provided with a through hole A for the piston rod to pass through; The movable plate is provided with a through hole B, the locking joint is placed in the through hole B, and the center hole of the locking joint is provided with an internal thread, the small diameter section of the piston rod is provided with an external thread, and the small diameter section of the piston rod is threadedly connected to the center hole of the locking joint; the anti-rotation locking washer is placed on the end of the large diameter section of the piston rod, and the locking bolt passes through the locking joint, the movable plate, and the anti-rotation locking washer in sequence to connect the three into one.
2. A cylinder locking mechanism according to claim 1, characterized in that: The center hole wall of the anti-rotation locking gasket is formed by four staggered planes and four arc surfaces that are smoothly connected; the end side wall of the large-diameter section of the piston rod matches the center hole wall of the anti-rotation locking gasket.
3. The cylinder locking mechanism according to claim 1, wherein: The through hole A of the fixing plate has a hole wall provided with a step surface matching the anti-rotation locking washer.
4. The cylinder locking mechanism according to claim 1, wherein: The hole wall of the through hole B and the outer side wall of the locking joint are respectively provided with step surfaces that match each other.
5. The cylinder locking mechanism according to claim 1, wherein: The anti-rotation locking gasket is provided with four evenly distributed threaded holes, the locking joint is provided with a stepped through hole matching the locking bolt, and the movable plate is provided with a through hole C at a position corresponding to the stepped through hole; the locking bolt passes through the stepped through hole of the locking joint and the through hole C of the movable plate in turn, and is threadedly connected with the threaded hole of the anti-rotation locking gasket.