Moulding and setting device for PTFE piston rings

Abstract

The utility model relates to a kind of moulding setting devices, specifically a kind of moulding setting device of PTFE piston ring, including moulding setting seat and the lower pressure driving cylinder and guide pillar being set in the top of moulding setting seat, the bottom fixed mounting of lower pressure driving cylinder has upper die and the lower die being set in the top of moulding setting seat and being set in the lower side of upper die, the die cavity of upper die and lower die is all set with aperture and the demoulding mechanism being set in the rear side of upper die and lower die, the utility model;Innovatively, the die cavity of upper die and lower die is all set with the demoulding ejector rod flush with die cavity, after completing setting process, with upper die moving away from lower die upwards, the demoulding ejector rod on the die cavity of upper die and lower die is synchronously ejected, can synchronously eject the material in upper die and lower die;This design can effectively avoid the situation that piston ring appears after completing setting, adhere in the die cavity of upper die or lower die, improve demoulding efficiency, reduce the piston ring damage risk possibly caused by adhering.

Description

Technical Field

[0001] This utility model relates to a molding and shaping device, specifically a molding and shaping device for PTFE piston rings. Background Technology

[0002] PTFE piston rings are ring-shaped parts made primarily of polytetrafluoroethylene. They are typically installed in piston ring grooves and are mainly used to seal the gap between the piston and the cylinder to prevent gas or fluid leakage. PTFE's resistance to high and low temperatures, corrosion resistance, and low coefficient of friction also allow it to adapt to various complex working conditions.

[0003] The piston ring molding and shaping device is a device that uses a mold to apply pressure and coordinates with temperature control to press the PTFE raw material of the piston ring into a specific ring size and achieve structural shaping. It mainly consists of a molding mold, a pressure drive component, and a temperature control module. Its working process is roughly as follows: First, the prepared raw material is filled into the mold cavity; then the pressure component is activated to apply the set pressure, so that the raw material is densely formed in the mold; at the same time, the temperature control module regulates the mold temperature to help stabilize the material and shape it; after holding the pressure for a period of time, the pressure is released, the mold is opened, and the formed piston ring blank is taken out, completing the molding and shaping.

[0004] Due to the inherent viscosity of PTFE material, there is a risk of blanks sticking to the mold cavity. In traditional devices, piston rings may stick inside the upper or lower mold cavity during demolding, often leading to demolding difficulties. In addition, traditional demolding ejector pins are mostly independently set on one side and lack a synchronous telescopic structure that links with the upper and lower molds. During the process of the upper mold being raised and the lower mold being stationary after molding, the timing of the ejector pin extension and retraction is prone to deviation. This results in the ejector pin not being able to accurately return to a flush state with the mold cavity when retracting, which can lead to incomplete mold cavity surfaces, indentations during the molding process, and affect the dimensional accuracy and surface quality of the piston rings. Utility Model Content

[0005] The purpose of this invention is to provide a molding and shaping device for PTFE piston rings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A molding and shaping device for PTFE piston rings includes a molding and shaping base, a pressing drive cylinder and a guide column disposed on the top of the molding and shaping base, an upper mold and a lower mold disposed below the upper mold and on the top of the molding and shaping base are fixedly installed at the bottom of the pressing drive cylinder, and the mold cavities of the upper mold and the lower mold are provided with openings and demolding mechanisms disposed on the rear side of the upper mold and the lower mold, and a rotating column and a transmission mechanism for executing the demolding mechanism to move are rotatably mounted on the molding and shaping base; The transmission mechanism includes a helical transmission mechanism slidably mounted on the top of the rotating column and a threaded transmission mechanism disposed at the bottom of the rotating column, wherein the helical transmission mechanism and the threaded transmission mechanism cooperate with each other.

[0007] The PTFE piston ring molding and shaping device described above: the demolding mechanism includes multiple springs disposed inside the upper and lower molds, and a fixing member disposed on the top of the multiple springs. The bottom of the fixing member is provided with multiple demolding ejector rods, and the demolding ejector rods cooperate with the opening.

[0008] The PTFE piston ring molding and shaping device described above: one end of each of the two fixing members is provided with a first connecting ring and a second connecting ring, and the first connecting ring and the second connecting ring are respectively disposed inside the upper mold and the lower mold.

[0009] The PTFE piston ring molding and shaping device described above: a connecting frame and a limiting pressure plate disposed at the bottom of the connecting frame are fixedly installed on the guide post, and the top end of the rotating post is rotatably connected to the connecting frame.

[0010] The PTFE piston ring molding and shaping device described above: the helical transmission mechanism includes a sliding sleeve slidably mounted on the rotating column and a helical groove formed inside the sliding sleeve, the helical groove slidingly engaging with a ball disposed at one end of the rotating column.

[0011] The PTFE piston ring molding and shaping device described above: The threaded transmission mechanism includes an external threaded cylinder fixedly sleeved at the bottom end of the rotating column and an internal threaded block threadedly connected to the external threaded cylinder, and the second connecting ring is rotatably sleeved on the outer wall of the internal threaded block.

[0012] The PTFE piston ring molding and shaping device described above: the first connecting ring is rotatably sleeved on the outer wall of the sliding sleeve, and the sliding sleeve is squeezed into the limiting pressure plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: innovatively, both the upper and lower mold cavities are provided with ejector pins flush with the mold cavities. After the shaping process is completed, as the upper mold moves upward away from the lower mold, the ejector pins on the upper and lower mold cavities are ejected synchronously, which can simultaneously eject the material in the upper and lower molds. This design can effectively avoid the piston rings from sticking to the inside of the upper or lower mold cavity after shaping, improve demolding efficiency, and reduce the risk of piston ring damage caused by sticking.

[0014] This utility model also effectively avoids the problem of blank sticking to the mold cavity due to the viscous properties of PTFE material through a synchronous ejection mechanism, reduces the risk of workpiece damage caused by manual peeling, and the design of the ejector rod being flush with the mold cavity can ensure the integrity of the mold cavity surface during the molding process, avoid indentation caused by the ejector rod protrusion, and ensure the dimensional accuracy and surface quality of the piston ring. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the molding and shaping device for PTFE piston rings.

[0016] Figure 2 This is a schematic diagram of the overall front structure of the molding and shaping device for PTFE piston rings.

[0017] Figure 3 This is a schematic diagram of the internal structure of the molding and shaping device for PTFE piston rings.

[0018] Figure 4 This is a schematic diagram of the internal structure of the molding and shaping device for PTFE piston rings, viewed from below.

[0019] Figure 5 This is a schematic diagram of the guide post, upper mold, lower mold, demolding mechanism, and transmission mechanism in the molding and shaping device for PTFE piston rings.

[0020] Figure 6 This is a schematic diagram of the transmission mechanism in the molding and shaping device for PTFE piston rings.

[0021] Figure 7 This is a disassembled structural diagram of the rotating column, helical drive mechanism, and threaded drive mechanism in the molding and shaping device for PTFE piston rings.

[0022] Figure 8 This is a cross-sectional schematic diagram of the screw drive mechanism in the molding and shaping device for PTFE piston rings.

[0023] Figure 9 This is a schematic diagram of the demolding mechanism in the molding and shaping device for PTFE piston rings.

[0024] Figure 10 This is a disassembled structural diagram of the demolding mechanism in the molding and shaping device for PTFE piston rings.

[0025] In the diagram: 1. Molding and shaping base; 2. Downward pressure drive cylinder; 3. Guide pillar; 4. Upper mold; 5. Lower mold; 6. Opening; 7. Spring; 8. Fixing component; 9. Demolding ejector pin; 10. First connecting ring; 11. Second connecting ring; 12. Rotating column; 13. Connecting frame; 14. Limiting pressure plate; 15. Ball; 16. Sliding sleeve; 17. Spiral groove; 18. External threaded cylinder; 19. Internal threaded block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Please see Figures 1-10 As an embodiment of the present utility model, the PTFE piston ring molding and shaping device includes a molding and shaping base 1 and a pressing drive cylinder 2 and a guide post 3 disposed on the top of the molding and shaping base 1. An upper mold 4 and a lower mold 5 disposed below the upper mold 4 and on the top of the molding and shaping base 1 are fixedly installed at the bottom of the pressing drive cylinder 2. An opening 6 is provided on the mold cavity of the upper mold 4 and the lower mold 5, and a demolding mechanism is disposed on the rear side of the upper mold 4 and the lower mold 5. A rotating column 12 and a transmission mechanism for executing the demolding mechanism to move are rotatably mounted on the molding and shaping base 1. The transmission mechanism includes a helical transmission mechanism slidably mounted on the top of the rotating column 12 and a threaded transmission mechanism disposed at the bottom of the rotating column 12, wherein the helical transmission mechanism and the threaded transmission mechanism cooperate with each other.

[0028] In this embodiment, the molding and shaping device is equipped with demolding mechanisms on both the upper mold 4 and the lower mold 5. After the shaping process is completed, as the upper mold 4 moves upward away from the lower mold 5, the transmission mechanism works in conjunction with the demolding mechanism. This allows the demolding mechanisms on the upper mold 4 and the lower mold 5 to eject synchronously after the upper mold 4 moves upward away from the lower mold 5. This synchronously ejects the material from the upper mold 4 and the lower mold 5, effectively preventing the piston rings from sticking to the inside of the upper mold 4 or the lower mold 5 after shaping, thus improving demolding efficiency.

[0029] As a further embodiment of this utility model, the demolding mechanism includes a plurality of springs 7 disposed inside the upper mold 4 and the lower mold 5, and a fixing member 8 disposed on the top of the plurality of springs 7. The bottom of the fixing member 8 is provided with a plurality of demolding ejector rods 9, and the demolding ejector rods 9 cooperate with the opening 6.

[0030] In this embodiment, multiple springs 7 are provided inside both the upper mold 4 and the lower mold 5. One end of each spring 7 is connected to the same fixing member 8. Multiple ejector pins 9 fixed below the fixing member 8 fit into the openings 6 on the mold cavities of the upper mold 4 and the lower mold 5. The design of the ejector pins 9 being flush with the mold cavity can ensure the integrity of the mold cavity surface during the molding process, avoid indentations caused by the protrusion of the ejector pins, and ensure the dimensional accuracy and surface quality of the piston ring.

[0031] As a further embodiment of this utility model, one end of each of the two fixing members 8 is provided with a first connecting ring 10 and a second connecting ring 11, and the first connecting ring 10 and the second connecting ring 11 are respectively disposed inside the upper mold 4 and the lower mold 5.

[0032] In this embodiment, the first connecting ring 10 and the second connecting ring 11 are respectively disposed on one side of the upper and lower fixing members 8.

[0033] As a further embodiment of this utility model, a connecting frame 13 and a limiting pressure plate 14 are fixedly installed on the guide post 3, and the top end of the rotating post 12 is rotatably connected to the connecting frame 13.

[0034] In this embodiment, the connecting frame 13 is fixedly installed on the top of the guide post 3, and the limiting pressure plate 14 at its bottom plays a limiting role in the movement of the upper mold 4. The rotating post 12 is rotatably connected to the bottom of the connecting frame 13.

[0035] As a further embodiment of this utility model, the helical transmission mechanism includes a sliding sleeve 16 slidably mounted on the rotating column 12 and a helical groove 17 formed inside the sliding sleeve 16, wherein the helical groove 17 is slidably engaged with a ball 15 disposed at one end of the rotating column 12.

[0036] In this embodiment, the sliding sleeve 16 is fitted onto the rotating column 12, and its internal spiral groove 17 is spirally engaged with the sphere 15.

[0037] As a further embodiment of this utility model, the threaded transmission mechanism includes an external threaded cylinder 18 fixedly sleeved at the bottom end of the rotating column 12 and an internal threaded block 19 threadedly connected to the external threaded cylinder 18, wherein the second connecting ring 11 is rotatably sleeved on the outer wall of the internal threaded block 19.

[0038] In this embodiment, the outer wall of the external threaded cylinder 18 is provided with external threads, and the internal threaded block 19 is threadedly connected to the outer wall of the external threaded cylinder 18.

[0039] As a further embodiment of this utility model, the first connecting ring 10 is rotatably sleeved on the outer wall of the sliding sleeve 16, and the sliding sleeve 16 is in a compression fit with the limiting pressure plate 14.

[0040] In this embodiment, after the shaping process is completed, the upper mold 4 moves upward away from the lower mold 5. Subsequently, the upper mold 4 drives the sliding sleeve 16 to move upward through the first connecting ring 10. Then, the sliding sleeve 16 passes over the ball 15 on one side of the rotating column 12. At this time, the spiral groove 17 inside the sliding sleeve 16 limits the path of the ball 15, causing the ball 15 to move spirally along the spiral groove 17, thereby driving the rotating column 12 to rotate. During the rotation of the rotating column 12, the external threaded cylinder 18 will engage with the internal threaded block 19. In conjunction, the internal threaded block 19 moves upward, causing the second connecting ring 11 to move. Simultaneously, as the upper mold 4 continues to move upward, the sliding sleeve 16 moves below the limiting pressure plate 14. Subsequently, the sliding sleeve 16 is squeezed by the limiting pressure plate 14, causing the sliding sleeve 16 and the first connecting ring 10 on one side to move downward. At this time, the first connecting ring 10 and the second connecting ring 11 each drive the fixing part 8 to move and compress the spring 7, so that the ejector pins 9 on the upper mold 4 and the lower mold 5 are ejected synchronously, realizing the synchronous ejection of the material in the upper mold 4 and the lower mold 5.

[0041] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A molding and shaping device for a PTFE piston ring, comprising a molding and shaping seat (1) and a pressing drive cylinder (2) and a guide post (3) disposed on the top of the molding and shaping seat (1), characterized in that, The bottom of the pressing drive cylinder (2) is fixedly installed with an upper mold (4) and a lower mold (5) located below the upper mold (4) and on the top of the molding base (1). The upper mold (4) and the lower mold (5) are both provided with openings (6) and demolding mechanisms located on the rear side of the upper mold (4) and the lower mold (5). The molding base (1) is rotatably installed with a rotating column (12) and a transmission mechanism on the rotating column (12) for executing the demolding mechanism to move. The transmission mechanism includes a helical transmission mechanism that is slidably mounted on the top of the rotating column (12) and a threaded transmission mechanism that is disposed at the bottom of the rotating column (12), the helical transmission mechanism and the threaded transmission mechanism cooperating with each other.

2. The molding and shaping device for a PTFE piston ring according to claim 1, characterized in that, The demolding mechanism includes multiple springs (7) disposed inside the upper mold (4) and the lower mold (5), and a fixing member (8) disposed on the top of the multiple springs (7). Multiple demolding ejector rods (9) are disposed at the bottom of the fixing member (8), and the demolding ejector rods (9) cooperate with the opening (6).

3. The molding and shaping device for a PTFE piston ring according to claim 2, characterized in that, One end of each of the two fixing members (8) is provided with a first connecting ring (10) and a second connecting ring (11), and the first connecting ring (10) and the second connecting ring (11) are respectively disposed inside the upper mold (4) and the lower mold (5).

4. The molding and shaping device for a PTFE piston ring according to claim 3, characterized in that, A connecting frame (13) and a limiting pressure plate (14) are fixedly installed on the guide column (3). The top end of the rotating column (12) is rotatably connected to the connecting frame (13).

5. The molding and shaping device for a PTFE piston ring according to claim 4, characterized in that, The helical transmission mechanism includes a sliding sleeve (16) slidably mounted on the rotating column (12) and a helical groove (17) formed inside the sliding sleeve (16). The helical groove (17) is slidably engaged with a ball (15) disposed at one end of the rotating column (12).

6. The molding and shaping device for a PTFE piston ring according to claim 5, characterized in that, The threaded transmission mechanism includes an external threaded cylinder (18) fixedly sleeved at the bottom end of the rotating column (12) and an internal threaded block (19) threadedly connected to the external threaded cylinder (18). The second connecting ring (11) is rotatably sleeved on the outer wall of the internal threaded block (19).

7. The molding and shaping device for a PTFE piston ring according to claim 6, characterized in that, The first connecting ring (10) is fixedly sleeved on the outer wall of the sliding sleeve (16), and the sliding sleeve (16) is squeezed into the limiting pressure plate (14).

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