Split piston for rtm injection machine

Abstract

The utility model discloses a kind of split type pistons for RTM injection machine, belong to composite material production technical field, including piston main body and sealing ring, the number of sealing ring is N, the piston main body includes N+1 split units arranged along axial direction, each the split unit is detachably connected through connecting piece, and there is sealing groove matched with the sealing ring between the adjacent two split units. The utility model does not need to force installation by means of auxiliary tool when assembling sealing ring, ensures that sealing ring is not damaged, and then ensure that piston and cylinder body have good sealing property.

Description

Technical Field

[0001] This utility model relates to the field of composite material production technology, and in particular to a split piston for an RTM injection molding machine. Background Technology

[0002] In composite material production, RTM injection molding machines employ an injection method that combines a cylinder and a piston to achieve precise resin delivery.

[0003] To ensure the sealing of the RTM injection molding machine cavity, a sealing ring needs to be installed on the contact surface between the piston and the inner wall of the cylinder. Since the sealing ring needs to withstand high temperatures of 300-400℃ and its material is relatively hard, it is necessary to use auxiliary tools such as screwdrivers to insert it into the sealing groove on the piston surface. However, the above assembly method is prone to damage to the sealing ring due to improper operation, or to cause permanent deformation of the sealing ring, resulting in poor sealing between the piston and the cylinder. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a split-type piston for RTM injection machines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A split-type piston for an RTM injection molding machine includes a piston body and N sealing rings. The piston body comprises N+1 axially arranged split units, each of which is detachably connected via a connector. Adjacent split units have sealing grooves that mate with the sealing rings. By configuring the piston body as multiple axially detachable split units, the sealing rings are directly installed in the sealing grooves between adjacent split units, thus avoiding the negative impact of applying force to the sealing rings using auxiliary tools and ensuring good sealing between the piston and the cylinder after the sealing rings are installed.

[0007] The piston body is provided with a piston rod at its tail end, and each of the split units is fixed with a connecting part that extends to the tail end of the piston body and is detachably connected to the piston rod.

[0008] The connecting part is a threaded sleeve, and the end of the piston rod is formed with an external thread that mates with the threaded sleeve.

[0009] An annular step is provided on the outer edge of the mating surface of one of the two adjacent split units, and the annular step and the mating surface of the other split unit form the sealing groove.

[0010] The annular stepped portion is located on the side of the adjacent two split units closest to the piston body's head. The single-sided opening of the annular stepped portion reduces the machining difficulty of the split unit, and its proximity to the piston body's head facilitates the installation of the sealing ring during vertical assembly.

[0011] One of the two adjacent split units has a boss fixed in the middle of its mating surface, while the other split unit has a groove in the middle of its mating surface that mates with the boss. The engagement of the boss and the groove enables positioning of each split unit during assembly, preventing misalignment between adjacent units and ensuring the consistency of the assembled piston body in the axial direction.

[0012] The connector includes multiple shoulder bolts. Multiple first internal threads are provided on the mating surface of the split unit located at the front end of the piston body along the circumference. Multiple through holes are provided on the remaining split units along the circumference. Each shoulder bolt passes through the through hole from the rear end of the piston body and is connected to the first internal thread.

[0013] The sealing rings are at least two in number, and the connectors include multiple shoulder bolts divided into at least two groups. Multiple first internal threads are provided circumferentially on the mating surface of the split unit located at the first end of the piston body. Multiple countersunk holes are provided circumferentially on at least one split unit located in the middle of the piston body. Multiple second internal threads are provided circumferentially on the mating surface located on one side of the countersunk end of the countersunk hole. Multiple through holes are provided circumferentially on the remaining split units. One group of shoulder bolts passes through the through hole from the countersunk end of the countersunk hole and is connected to the first internal thread. Another group of shoulder bolts passes through the through hole from the tail end of the piston body and is connected to the second internal thread.

[0014] This utility model has the following beneficial effects:

[0015] This invention sets the piston body as multiple axially detachable split units, and the sealing ring is directly installed in the sealing groove between adjacent split units, thereby avoiding the negative impact of using auxiliary tools to apply force to the sealing ring, achieving non-destructive installation, and maintaining good sealing between the piston and cylinder after the sealing ring is installed. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0019] Figure 3 This is a cross-sectional view of Embodiment 2 of this utility model;

[0020] Figure 4 This is a cross-sectional view of Embodiment 2 of this utility model after removing the shoulder bolt and the sealing ring;

[0021] Figure 5 This is a disassembly diagram of the present invention;

[0022] Figure 6 This is a disassembly diagram of the present invention from another angle.

[0023] 1. Split unit; 101. First split unit; 1011. First stepped portion; 1012. First boss portion; 1013. First internal thread portion; 102. Second split unit; 1021. Second stepped portion; 1022. Second boss portion; 1023. First through hole; 1024. First groove portion; 103. Third split unit; 1031. Third stepped portion; 1032. Second groove portion; 1033. Countersunk hole; 1034. Second internal thread portion; 1035. Third groove portion; 104. Fourth split unit; 1041. Second through hole; 1042. Third boss portion; 2. Sealing ring; 3. Connector; 301. First shoulder bolt group; 302. Second shoulder bolt group; 4. Threaded sleeve; 5. Sealing groove; 6. Through hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 1 As shown, this utility model provides a split-type piston for an RTM injection machine, including a piston body and sealing rings 2. The number of sealing rings 2 is N, where N is a positive integer. The piston body includes N+1 split units 1 arranged axially, such as... Figure 2 As shown, in this scheme, the number of sealing rings 2 is three, and the ends furthest from the piston body along the axial direction are marked as first sealing ring 2, second sealing ring 2, and third sealing ring 2. There are four split units 1, and the ends furthest from the piston body along the axial direction are marked as first split unit 101, second split unit 102, third split unit 103, and fourth split unit 104. Each split unit 1 is detachably connected via a connector 3, and there is a sealing groove 5 between adjacent split units 1 that mates with the sealing rings 2. Figure 1 and Figure 2 As shown in Embodiment 1, the connector 3 includes multiple shoulder bolts, with the number of shoulder bolts being 4-6. Specifically, 6 shoulder bolts are used. The upper surface of the first split unit 101 has 6 first internal thread portions 1013 along the circumferential direction. The second split unit 102, the third split unit 103, and the fourth split unit 104 have 6 through holes 6 along the circumferential direction. Each shoulder bolt passes through the through holes 6 of the fourth split unit 104, the third split unit 103, and the second split unit 102 in sequence and is connected to the first internal thread portion 1013. The head of the shoulder bolt abuts against the surface of the fourth split unit 104.

[0029] The piston body is composed of multiple detachable split units 1 arranged along the axial direction. When assembling the piston, the split units 1 are stacked one by one. During this process, the sealing ring 2 can be directly installed in the sealing groove 5 between adjacent split units 1, thereby avoiding the negative impact caused by using auxiliary tools to apply force to the sealing ring 2, achieving non-destructive installation, and ensuring good sealing between the piston and the cylinder after the sealing ring 2 is installed.

[0030] The piston body has a piston rod (not shown in the figure) at its tail end. The piston rod is connected to the drive unit of the RTM injection machine. Each of the split units 1 has a connecting part fixed in the middle, extending to the tail end of the piston body and detachably connected to the piston rod. Specifically, the connecting part is a threaded sleeve 4. The end of the piston rod is formed with an external thread that mates with the threaded sleeve 4. The upper end of the threaded sleeve 4 has a clamping part for a wrench. In this solution, as... Figure 2 and Figure 5 As shown, the threaded sleeve 4 is formed in the middle of the second split unit 102, and the middle of the third split unit 103 and the fourth split unit 104 have through-hole structures for the threaded sleeve 4 to pass through. In other embodiments, the threaded sleeve 4 can also be formed in the middle of the first split unit 101, and the middle of the second split unit 102, the third split unit 103 and the fourth split unit 104 have through-hole structures. Of course, the threaded sleeve 4 can also be formed in the middle of the third split unit 103, in which case the middle of the fourth split unit 104 has a through-hole structure. If the threaded sleeve 4 is directly formed in the middle of the fourth split unit 104, then there is no need to open through-hole structures on other split units.

[0031] An annular step is formed on the outer edge of the mating surface of one of the two adjacent split units 1. This annular step, together with the mating surface of the other split unit 1, forms the sealing groove 5. The annular step on one side of the two adjacent split units 1, compared to having it on both sides, reduces the machining difficulty of the entire piston body to some extent. Furthermore, to facilitate the installation of the sealing ring 2 during vertical assembly, the annular step is located on the split unit closest to the head end of the piston body. Figure 5 As shown, the upper surface of the first split unit 101 has a first step portion 1011, the upper surface of the second split unit 102 has a second step portion 1021, and the upper surface of the third split unit 103 has a third step portion 1031. During assembly, the first sealing ring 2, the second sealing ring 2 and the third sealing ring 2 are placed on the first step portion 1011, the second step portion 1021 and the third step portion 1031 in sequence. In order to improve the sealing effect of the sealing ring 2 in the sealing groove 5, the thickness of the sealing ring 2 is slightly higher than the height of the step portion, so that the sealing ring 2 is pressed tightly between the two adjacent split units 1.

[0032] Further preferably, to further ensure the consistency of each sub-unit 1 in the axial direction, a boss is fixed in the middle of the mating surface of one of two adjacent sub-units 1, and a groove is provided in the middle of the mating surface of the other sub-unit 1 to mate with the boss. The adjacent sub-units 1 are assembled and positioned by the cooperation of the boss and the groove, thereby avoiding misalignment between adjacent sub-units 1; specifically, as shown... Figure 5 and Figure 6 As shown, the upper surface of the first split unit 101 is machined to form a first boss portion 1012, and the lower surface of the second split unit 102 is machined to form a first groove portion 1024; the upper surface of the second split unit 102 is machined to form a second boss portion 1022, the lower surface of the third split unit 103 is machined to form a second groove portion 1032; the upper surface of the third split unit 103 is machined to form a third groove portion 1035, and the lower surface of the fourth split unit 104 is machined to form a third boss portion 1042. During assembly, the first groove portion 1024 is placed on the first boss portion 1012, the second groove portion 1032 is placed on the second boss portion 1022, and the third boss portion 1042 is placed inside the third groove portion 1035. In this embodiment, for ease of processing, the boss portion is an annular boss and the groove portion is an annular groove.

[0033] Because each sub-unit 1 needs to meet certain thickness requirements, the length of a single set of shoulder bolts will increase with the number of sub-units 1. To avoid the use of excessively long shoulder bolts, especially for piston bodies assembled with more than three sub-units 1, in embodiment 2, the connecting member 3 includes multiple shoulder bolts divided into at least two groups. Taking two groups of shoulder bolts as an example, they are labeled as the first shoulder bolt group 301 and the second shoulder bolt group 302. Figure 3 As shown, the first shoulder bolt group 301 has 6 shoulder bolts, used to connect the first split unit 101, the second split unit 102, and the third split unit 103. The second shoulder bolt group 302 has 4 shoulder bolts, used to connect the third split unit 103 and the fourth split unit 104. Specifically, as shown... Figure 4 and Figure 5As shown, the first split unit 101 has six first internal threads 1013 circumferentially formed on its upper surface; the third split unit 103 has six countersunk holes 1033 circumferentially formed on its upper surface; four second internal threads 1034 circumferentially formed on the mating surface on one side of the countersunk end of the countersunk holes 1033; the second split unit 102 has six first through holes 1023 circumferentially formed on its upper surface; and the fourth split unit 104 has four second through holes 1041 circumferentially formed on its upper surface; a first shoulder bolt assembly is also included. Each shoulder bolt of the first shoulder bolt group 301 passes through the countersunk end of the countersunk hole 1033 and is connected to the first internal thread portion 1013 after passing through the first through hole 1023. The head height of each shoulder bolt of the first shoulder bolt group 301 is not higher than the countersunk end depth of the countersunk hole 1033. Each shoulder bolt of the second shoulder bolt group 302 passes through the second through hole 1041 and is connected to the second internal thread portion 1034. The head of each shoulder bolt of the second shoulder bolt group 302 abuts against the surface of the fourth split unit 104.

[0034] Taking Embodiment 2 as an example, when assembling the piston, the first split unit 101 is placed on the mounting platform, the first sealing ring 2 is fitted onto the outside of the first step portion 1011, the second split unit 102 engages with the first boss portion 1012 of the first split unit 101 through the first groove portion 1024, the second sealing ring 2 is fitted onto the outside of the second step portion 1021, the third split unit 103 engages with the second boss portion 1022 of the second split unit 102 through the second groove portion 1032, and the first split unit 103 is connected by the shoulder bolts of the first shoulder bolt group 301, so that the first sealing ring 2 and the second sealing ring 2 are connected. The third sealing ring 2 is securely installed in the corresponding sealing groove 5; the third sealing ring 2 is fitted on the outside of the third step portion 1031; the fourth split unit 104 cooperates with the third groove portion 1035 of the third split unit 103 through the third boss portion 1042; the shoulder bolts of the first shoulder bolt group 301 connect the fourth split unit 104 and the third split unit 103 to ensure that the third sealing ring 2 is securely installed in the corresponding sealing groove 5; at this time, the threaded sleeve 4 passes through the fourth split unit 104 and is threadedly connected to the piston rod. During the entire assembly process, the sealing ring 2 does not need to be installed with the help of auxiliary tools, ensuring that the sealing ring 2 is not damaged, thereby ensuring good sealing between the piston and the cylinder.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A split-type piston for an RTM injection molding machine, comprising a piston body and a sealing ring, characterized in that, The number of sealing rings is N, and the piston body includes N+1 split units arranged along the axial direction. Each split unit is detachably connected by a connector, and there is a sealing groove between two adjacent split units that cooperates with the sealing ring.

2. The split piston for an RTM injection machine according to claim 1, characterized in that, The piston body is provided with a piston rod at its tail end, and each of the split units is fixed with a connecting part that extends to the tail end of the piston body and is detachably connected to the piston rod.

3. The split piston for an RTM injection machine according to claim 2, characterized in that, The connecting part is a threaded sleeve, and the end of the piston rod is formed with an external thread that mates with the threaded sleeve.

4. The split piston for an RTM injection machine according to claim 1, characterized in that, An annular step is provided on the outer edge of the mating surface of one of the two adjacent split units, and the annular step and the mating surface of the other split unit form the sealing groove.

5. The split piston for an RTM injection machine according to claim 4, characterized in that, The annular stepped portion is located on the side of the two adjacent split units near the head end of the piston body.

6. The split piston for an RTM injection machine according to any one of claims 1-5, characterized in that, One of the two adjacent split units has a boss fixed in the middle of its mating surface, and the other split unit has a groove in the middle of its mating surface that mates with the boss.

7. The split piston for an RTM injection machine according to any one of claims 1-5, characterized in that, The connector includes multiple shoulder bolts. Multiple first internal threads are provided on the mating surface of the split unit located at the front end of the piston body along the circumference. Multiple through holes are provided on the remaining split units along the circumference. Each shoulder bolt passes through the through hole from the rear end of the piston body and is connected to the first internal thread.

8. The split piston for an RTM injection machine according to any one of claims 1-5, characterized in that, The sealing rings are at least two in number, and the connectors include multiple shoulder bolts divided into at least two groups. Multiple first internal threads are provided circumferentially on the mating surface of the split unit located at the first end of the piston body. Multiple countersunk holes are provided circumferentially on at least one split unit located in the middle of the piston body. Multiple second internal threads are provided circumferentially on the mating surface located on one side of the countersunk end of the countersunk hole. Multiple through holes are provided circumferentially on the remaining split units. One group of shoulder bolts passes through the through hole from the countersunk end of the countersunk hole and is connected to the first internal thread. Another group of shoulder bolts passes through the through hole from the tail end of the piston body and is connected to the second internal thread.

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