A valve needle fixing structure

Abstract

The utility model relates to the technical field of valve needle fixing, and discloses a valve needle fixing structure, including a piston body, a plug hole is provided on the piston body, the plug hole penetrates the piston body in the axial direction, and a valve needle base is embedded in the plug hole, one end of the valve needle base is provided with a mounting groove for mounting the valve needle body, and the other end is provided with a detachable fixing component for fixing the valve needle base in the plug hole. The valve needle body is connected to the valve needle base through the mounting groove, the valve needle base can be connected to the piston body through the plug hole, and the fixing state of the valve needle base in the plug hole can be adjusted by using the fixing component; the structure is simple in principle and easy to operate. Without disassembling the internal structure of the cylinder, the valve needle body and the piston can be quickly disassembled and assembled, which simplifies the original disassembly and assembly process and greatly improves the work efficiency of disassembly and assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of valve needle fixing, in particular to a valve needle fixing structure. Background Art

[0002] The hot runner system is a molten plastic delivery unit used in injection molds. The hot runner system is generally composed of a main nozzle, a cylinder, a manifold, a hot nozzle, a valve needle, etc. These components introduce the molten plastic from the barrel of the injection molding machine into the mold cavity; the valve needle needs to realize the output of the molten plastic through the reciprocating motion of the piston fixed in the cylinder.

[0003] One end of the existing cylinder housing is a removable cover plate. After the valve needle body is fixedly installed on the piston, the piston is placed in the housing so that one end of the valve needle body can pass through the housing to its outside, and then the cover plate is installed in the housing opposite to the end of the valve needle body to complete the assembly of the overall structure.

[0004] The existing valve needle fixing structure currently uses a corresponding installation groove to be machined on the piston, and then one end of the valve needle body is directly fixed in the installation groove, so as to achieve the clamping and fixing between the valve needle body and the piston. However, this fixing method has complicated steps, and during the assembly and disassembly of the valve needle body, the internal structure of the cylinder needs to be disassembled as a whole before the piston and the valve needle body can be disassembled. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a valve needle fixing structure, in which the valve needle body can be connected to the valve needle base through a mounting groove opened at the end of the valve needle base, and a socket for installing the valve needle base is opened on the piston body, and then the fixing assembly is used to adjust the fixing state of the valve needle base in the socket; in this way, it is only necessary to open the cover plate of the cylinder, release the installation of the valve needle base in the socket through the fixing assembly, and then pull the valve needle base out of the socket from one end of the valve needle body, so as to quickly complete the disassembly between the valve needle body and the piston body without removing the internal structure of the cylinder.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A valve needle fixing structure includes a piston body, a socket is formed on the piston body, the socket passes through the piston body axially, and a valve needle base is embedded in the socket, one end of the valve needle base is provided with a mounting groove for mounting the valve needle body, and the other end is provided with a detachable fixing component for fixing the valve needle base in the socket.

[0008] In a preferred embodiment of the present invention, the insertion hole comprises a mounting portion and an embedding portion which are interconnected, and the mounting portion and the embedding portion are both coaxial with the piston body.

[0009] In a preferred embodiment of the utility model, the fixing assembly includes a nut and a spring retaining ring coaxially sleeved on the valve needle base, the nut is screwed together with the valve needle base, and the spring retaining ring is located at one end of the nut close to the bottom surface of the mounting portion.

[0010] In a preferred embodiment of the utility model, a spacer ring for supporting the spring retaining ring is arranged on the inner side of the mounting portion, a gasket is arranged between the spring retaining ring and the nut, and the spacer ring and the gasket are both sleeved on the valve needle base.

[0011] In a preferred embodiment of the present invention, the inner diameter of the mounting portion is larger than the inner diameter of the embedding portion, and one end of the spacer ring opposite to the spring retaining ring abuts against the bottom surface of the mounting portion and the valve needle base at the same time.

[0012] In a preferred embodiment of the present invention, a sealing ring is fixedly sleeved on the outer circumferential surface of the valve needle base, and the outer circumferential surface of the sealing ring is in contact with the inner side surface of the embedded portion.

[0013] In a preferred embodiment of the utility model, a groove for installing the spring retaining ring is formed on the inner circumferential surface of the mounting portion.

[0014] In a preferred embodiment of the utility model, a driving groove for driving the valve needle base to rotate around its own axis is formed at one end of the valve needle base close to the nut. Beneficial Effects

[0015] In the utility model, the valve needle body is connected to the valve needle base through the installation groove, and the valve needle base is connected to the piston body through the socket, and the fixing assembly can be used to adjust the fixing state of the valve needle base in the socket; when the fixing assembly releases the fixation of the valve needle base in the socket, the valve needle base can be pulled out of the socket from one end of the valve needle body, thereby completing the disassembly between the valve needle body and the piston body; the structural principle is simple and the operation is convenient. Without disassembling the internal structure of the cylinder, the disassembly and assembly between the valve needle body and the piston can be quickly completed, thereby simplifying the original disassembly and assembly process and greatly improving the disassembly and assembly work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of the piston of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the valve needle base and the nut of the utility model;

[0019] Among them, 1. piston body; 2. socket; 21. mounting part; 22. embedded part; 3. valve needle base; 31. drive groove; 4. mounting groove; 5. nut; 6. gasket; 7. spring retaining ring; 71. groove; 8. spacer ring; 9. sealing ring. DETAILED DESCRIPTION

[0020] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] like Figure 1-Figure 3 As shown, a valve needle fixing structure includes a piston body 1, a socket 2 is formed on the piston body 1, the socket 2 penetrates the piston body 1 axially, and a valve needle base 3 is embedded in the socket 2, one end of the valve needle base 3 is provided with a mounting groove 4 for mounting the valve needle body, and the other end is provided with a detachable fixing component for fixing the valve needle base 3 in the socket 2.

[0022] When assembling the valve needle body and the piston body 1, the end of the valve needle base 3 opposite to the installation groove 4 is embedded in the hole 2 from bottom to top, and the valve needle base 3 is fixed in the hole 2 by a detachable fixing component to realize the fixed connection between the valve needle base 3 and the piston body 1; because the valve needle body can be fixedly connected to the valve needle base 3 through the installation groove 4, the assembly between the valve needle body and the piston body 1 can be realized by assembling the valve needle base 3 and the piston body 1.

[0023] When disassembling the valve needle body and the piston body 1, first release the fixation of the valve needle base 3 in the socket 2 through the fixing assembly, and then directly pull the valve needle base 3 out of the socket 2 from one end of the valve needle body, thereby completing the disassembly between the valve needle body and the piston body 1.

[0024] Since the valve needle base 3 can be directly pulled out of the piston body 1 from one end of the valve needle body, when the valve needle body and the piston body 1 are disassembled and assembled, it is only necessary to open the cover plate of the cylinder housing and adjust the fixing state of the valve needle base 3 and the piston body 1 through the fixing assembly, so as to realize the rapid disassembly and assembly between the valve needle body and the piston body 1; and there is no need to disassemble the entire structure inside the cylinder to disassemble and assemble the piston body 1 and the valve needle body.

[0025] As mentioned above, in order to facilitate the positioning and installation of the valve needle base 3, the valve needle base 3 is flush with the corresponding end surface of the piston body 1, one end of the valve needle body can be embedded in the installation groove 4 at the end of the valve needle base 3, and the fixed connection between the two is completed by welding, and the other end protrudes from the end surface of the piston body 1, and can pass through to the outside of the cylinder with the movement of the piston body 1 to perform corresponding opening and closing operations.

[0026] Furthermore, the socket 2 includes a mounting portion 21 and an embedding portion 22 which are interconnected, and the mounting portion 21 and the embedding portion 22 are both coaxial with the piston body 1; the socket 2 is opened at the center position of the piston body 1, the fixing assembly is located on the inner side of the mounting portion 21 of the socket 2, the mounting groove 4 is located on the inner side of the embedding portion 22 of the socket 2, and the mounting groove 4 is also coaxial with the valve needle base 3; through this structure, the coaxial accuracy of the valve needle body moving with the piston body 1 can be ensured, thereby ensuring that the opening and closing work of the valve needle body can be carried out accurately.

[0027] As mentioned above, the fixing assembly includes a nut 5 and a spring retaining ring 7 which are coaxially sleeved on the valve needle base 3 . The nut 5 is screwed together with the valve needle base 3 , and the spring retaining ring 7 is located at one end of the nut 5 close to the bottom surface of the mounting portion 21 .

[0028] The nut 5 is screwed onto the valve needle base 3, and the spring retaining ring 7 is located below the nut 5. Through this structure, the valve needle base 3 can be fixed in the socket 2, and the spring retaining ring 7 can also be used to prevent the valve needle base 3 from axial or radial movement or sliding while ensuring a tight connection.

[0029] Furthermore, a spacer ring 8 for supporting the spring collar 7 is provided on the inner side of the mounting portion 21, a gasket 6 is provided between the spring collar 7 and the nut 5, and both the spacer ring 8 and the gasket 6 are sleeved on the valve needle base 3. The gasket 6 can increase the stability between the nut 5 and the spring collar 7, and the spacer ring 8 can increase the stability between the spring collar 7 and the piston body 1.

[0030] Specifically, the nut 5, gasket 6, spring retaining ring 7 and spacer ring 8 are in contact in sequence along the axial direction, and one end of the spacer ring 8 abuts against the bottom surface of the mounting portion 21, and the other end contacts with the spring retaining ring 7; as the nut 5 rotates relative to the valve needle base 3, the valve needle base 3 will be displaced along the axial direction; and the valve needle base 3 adopts a stepped shaft structure, which causes one of the axial diameter end surfaces of the valve needle base 3 to move with the valve needle base 3 until it contacts the end surface of the spacer ring 8 and remains flush with the bottom surface of the mounting portion 21, thereby realizing the axial positioning of the valve needle base 3 in the socket 2; that is, one end of the spacer ring 8 opposite to the spring retaining ring 7 abuts against the bottom surface of the mounting portion 21 and the valve needle base 3 at the same time, and the inner hole of the spacer ring 8 contacts the valve needle base 3, and the outer circumferential surface of the spacer ring 8 contacts the inner circumferential surface of the mounting portion 21, thereby realizing the radial positioning of the valve needle base 3 in the socket 2.

[0031] Among them, a groove 71 for installing the spring retaining ring 7 is opened on the inner circumferential surface of the mounting portion 21, and the width of the groove 71 is greater than the thickness of the spring retaining ring 7, so that the spacer ring 8 can firmly support the spring retaining ring 7, so that the end face of the spring retaining ring 7 opposite to the spacer ring 8 abuts against one of the side faces of the groove 71; in order to facilitate the disassembly and assembly of the fixing component in the socket 2, the inner diameter of the mounting portion 21 can be set to be larger than the inner diameter of the embedded portion 22, that is, the inner diameter of the mounting portion 21 is larger than the outer diameter of the nut 5, so as to facilitate the disassembly and assembly of the nut 5 using external tools.

[0032] Furthermore, a sealing ring 9 is fixedly sleeved on the outer circumferential surface of the valve needle base 3, and the outer circumferential surface of the sealing ring 9 is in contact with the inner side surface of the embedded portion 22. A sealing groove is provided on the valve needle base 3 at a position corresponding to the sealing ring 9, and the sealing ring 9 is installed in the sealing groove. The sealing ring 9 here can be an O-type structure to ensure the sealing between the air cavities at both ends of the piston body 1 in the cylinder.

[0033] In addition, a driving groove 31 for driving the valve needle base 3 to rotate around its own axis is formed at one end of the valve needle base 3 close to the nut 5. The cross section of the driving groove 31 is a square or regular hexagon. When removing, a tool can be inserted into the driving groove 31 to allow the valve needle base 3 to move axially. At the same time, a corresponding wrench can be used to twist the valve needle base 3 so that it can rotate around its own axis, which facilitates the removal work in the socket 2.

[0034] Working principle:

[0035] When assembling the valve needle body and the piston body 1, the end of the valve needle base 3 opposite to the installation groove 4 is inserted into the insertion hole 2 from bottom to top, so that the upper end of the valve needle base 3 is located inside the installation portion 21, and then the spacer ring 8, the spring retaining ring 7, and the gasket 6 are sequentially inserted into the valve needle base 3, and finally the nut 5 is screwed on and sleeved, and the valve needle base 3 is positioned and installed in the insertion hole 2 by screwing the nut 5;

[0036] When disassembling the valve needle body and the piston body 1, it is only necessary to open the cover plate at one end of the cylinder housing, then use an external tool to loosen the nut 5 to separate it from the valve needle base 3, and then remove the gasket 6 and the spring retaining ring 7 from the mounting portion 21 in turn to release the fixation of the valve needle base 3 in the socket 2. Finally, by pulling at one end of the valve needle body, the valve needle base 3 can be pulled out of the socket 2, and the disassembly work between the valve needle body and the piston body 1 is completed.

[0037] To sum up, this structure improves the flexibility of fixing and disassembling the valve needle in the cylinder in the prior art, avoiding the problems of complicated valve needle fixing steps and difficult disassembly; that is, the disassembly and assembly between the valve needle body and the piston body can be quickly completed without disassembling the internal structure of the cylinder, which simplifies the original disassembly and assembly process and greatly improves the disassembly and assembly work efficiency.

[0038] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A valve needle fixing structure, comprising a piston body (1), characterized in that: The piston body (1) is provided with a socket (2), the socket (2) axially passes through the piston body (1), and a valve needle base (3) is embedded in the socket (2), one end of the valve needle base (3) is provided with a mounting groove (4) for mounting the valve needle body, and the other end is provided with a detachable fixing component for fixing the valve needle base (3) in the socket (2); The fixing assembly comprises a nut (5) and a spring retaining ring (7) which are coaxially sleeved on the valve needle base (3); the nut (5) is screwed together with the valve needle base (3), and the spring retaining ring (7) is located at one end of the nut (5) close to the bottom surface of the mounting portion (21).

2. The valve needle fixing structure according to claim 1, characterized in that: The socket (2) comprises a mounting portion (21) and an embedding portion (22) which are connected to each other, and the mounting portion (21) and the embedding portion (22) are both coaxial with the piston body (1).

3. The valve needle fixing structure according to claim 2, characterized in that: A spacer ring (8) for supporting the spring retaining ring (7) is arranged on the inner side of the mounting portion (21), a gasket (6) is arranged between the spring retaining ring (7) and the nut (5), and the spacer ring (8) and the gasket (6) are both sleeved on the valve needle base (3).

4. The valve needle fixing structure according to claim 3, characterized in that: The inner diameter of the mounting portion (21) is greater than the inner diameter of the embedded portion (22), and one end of the spacer ring (8) opposite to the spring retaining ring (7) abuts against the bottom surface of the mounting portion (21) and the valve needle base (3) at the same time.

5. The valve needle fixing structure according to claim 4, characterized in that: A sealing ring (9) is fixedly sleeved on the outer circumferential surface of the valve needle base (3), and the outer circumferential surface of the sealing ring (9) fits the inner side surface of the embedded portion (22).

6. The valve needle fixing structure according to claim 5, characterized in that: A groove (71) for mounting the spring retaining ring (7) is provided on the inner circumferential surface of the mounting portion (21).

7. The valve needle fixing structure according to any one of claims 1 to 6, characterized in that: A driving groove (31) for driving the valve needle base (3) to rotate around its own axis is provided at one end of the valve needle base (3) close to the nut (5).

Images