A riveting tool for assembling a piston

Abstract

The utility model relates to solenoid valve technical field especially relates to a riveting pressure frock for piston assembly, include: bottom plate, top plate is parallel to bottom plate setting and is connected with bottom plate through connecting column group, middle plate is located between top plate and bottom plate, drive assembly sets up top plate top, and its drive rod passes through top plate and is connected on middle plate, moulding assembly sets up between middle plate and bottom plate, including moulding head and die holder, moulding head is fixed on middle plate, die holder is fixed on bottom plate, and die holder and moulding head coaxial arrangement are set up, be equipped with the positioning structure of moulding head end for piston one end to place, riveting structure of moulding head end is used for to the piston pressure equipment end carries out inwards extrusion or outward expansion to seal the block with gasket installation fixed in piston. Through the setting of die holder and moulding head, convert from the fixed mode of assembly force fit to the lock of structural deformation, provide durable guarantee for solenoid valve sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and in particular to a riveting fixture for piston assembly. Background Technology

[0002] As a key component that relies on electromagnetic control to open and close fluid passages, the core working mechanism of a solenoid valve is to drive a piston through a valve needle, thereby opening or closing the valve port and ultimately achieving precise control of the flow path. To ensure sealing performance, the piston structure of this type of solenoid valve is equipped with two sealing components: a first sealing gasket is installed on the end face of the piston that contacts the valve needle, and a second sealing gasket is installed on the end face of the piston that contacts the valve port.

[0003] When the first and second sealing gaskets are installed into the piston, they are manually pressed in, relying on the operator's hand strength and experience. However, in long-term continuous operation, operators are prone to fatigue, leading to uneven pressing pressure and misalignment of the pressing angle, which in turn causes the sealing gaskets to be improperly installed. If the sealing gaskets are not properly installed, the solenoid valve may fail to open or leak internally, affecting the reliability and service life of the solenoid valve. Utility Model Content

[0004] This invention provides a riveting fixture for piston assembly, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A riveting fixture for piston assembly, comprising: Base plate; The top plate is set parallel to the bottom plate and is connected to the bottom plate via a group of connecting columns; An intermediate plate is located between the top plate and the bottom plate; A drive assembly is disposed above the top plate, and its drive rod passes through the top plate and connects to the intermediate plate; A molding assembly, disposed between the intermediate plate and the base plate, includes a molding head and a mold base. The molding head is fixed on the intermediate plate, and the mold base is fixed on the base plate. The mold base and the molding head are coaxially arranged. The mold base is provided with a positioning structure for placing one end of the piston; The riveting structure at the end of the molding head is used to press the piston end inward or expand it outward to install and fix the sealing block and gasket inside the piston.

[0006] Furthermore, two sets of the molding assemblies are provided on the intermediate plate; One set of the molding assemblies is used to press a gasket abutting one end of the valve port into a piston, and another set of the molding assemblies is used to press a gasket abutting one end of the valve needle into a piston. Furthermore, two drive components are provided on the top plate corresponding to the two sets of molding components.

[0007] Furthermore, the positioning structure is configured as a protrusion, which is embedded in the mounting groove of the gasket; The riveting structure is configured with a concave surface. The bottom surface of the concave surface is used to press the sealing block into the central groove, while the inclined surface of the concave surface at the edge is used to press the sidewall of the central groove inward.

[0008] Furthermore, the positioning structure is configured as a groove for the end with the sealing block to be embedded; The riveting structure is configured with a top point, which uses a conical surface to expand the inner wall of the gasket mounting groove outward.

[0009] Furthermore, the drive rod of the drive assembly is collinear with the axis of the molding head; The drive rod of the drive assembly is connected to the top surface of the intermediate plate via a quick-connect structure, and the molding head is fixed to the bottom surface of the intermediate plate.

[0010] Furthermore, the quick-connect structure includes a transition shaft and a limiting plate; The limiting plate is fixed to the intermediate plate, and the limiting plate is provided with a through T-shaped groove; The end of the transition shaft is provided with a boss. One end of the transition shaft with the boss is connected to the T-shaped slide groove, and the other end is threadedly connected to the drive rod of the drive assembly.

[0011] Furthermore, guide components are symmetrically provided on both sides of the molding assembly.

[0012] Furthermore, guide components are provided on both sides of the drive component.

[0013] Furthermore, the guide assembly includes a guide rod and a linear bearing slidably mounted on the guide rod; The linear bearing is slidably disposed along the axial direction of the guide rod.

[0014] Furthermore, the drive assembly is either an electric cylinder or a pneumatic cylinder.

[0015] The following technical effects can be achieved through the technical solution of this utility model: By using a mold base to quickly position and fix the piston, and then using a riveting operation to press the piston end inward or outward under the drive of the drive assembly, the piston is transformed into a rigid constraint caused by the deformation of its own structure. This changes the fixing method from the fit of assembly force to the locking of structural deformation, providing a lasting guarantee for the sealing performance of the solenoid valve. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of the riveting fixture; Figure 2 This is a structural schematic diagram and a partial enlarged view of the press-fit sealing block; Figure 3 A schematic diagram and some enlarged views of the press-fit gasket structure; Figure 4 This is a schematic diagram of the quick-connect structure installation; Figure 5 This is a schematic diagram of the layout of a dual-station riveting fixture.

[0018] Reference numerals: 10, piston; 20, sealing block; 30, gasket; 1, base plate; 2, top plate; 3, intermediate plate; 4, drive assembly; 5, molding head; 5a, concave surface; 5b, center point; 6, mold base; 6a, protrusion; 6b, groove; 7, quick-connect structure; 71, transition shaft; 72, limiting plate; 8, guide assembly. Detailed Implementation

[0019] 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.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figures 1-5 As shown, this application provides a riveting fixture for assembling a piston 10, including a base plate 1; Top plate 2 is set parallel to bottom plate 1 and is connected to bottom plate 1 through connecting column group; The middle plate 3 is located between the top plate 2 and the bottom plate 1; The drive assembly 4 is located above the top plate 2, and its drive rod passes through the top plate 2 and is connected to the middle plate 3. The molding assembly is set between the intermediate plate 3 and the base plate 1, and includes a molding head 5 and a mold base 6. The molding head 5 is fixed on the intermediate plate 3, and the mold base 6 is fixed on the base plate 1. The mold base 6 and the molding head 5 are coaxially arranged. The mold base 6 is provided with a positioning structure for placing one end of the piston 10; The riveting structure at the end of the molding head 5 is used to press the piston 10 inward or expand it outward to install and fix the sealing block 20 and the gasket 30 inside the piston 10.

[0022] When installing the sealing block 20, after fixing the piston 10 through the positioning structure, the sealing block 20 is first installed. The molding head 5 is used to press the mounting hole wall of the piston 10 inward. The end of the hole wall will undergo plastic deformation, forming a locking point or locking ring that shrinks towards the center, directly pressing and limiting the periphery of the sealing block 20, so that the sealing block 20 and the piston 10 form a mechanical interlocking relationship. When installing the sealing gasket, after fixing the piston 10 through the positioning structure, the gasket 30 is installed. The mounting hole wall of the piston 10 is expanded outward, so that the end of the hole wall forms a retaining edge larger than the inner diameter of the gasket 30, which limits the gasket 30 axially, so that the gasket 30 is locked in the mounting groove.

[0023] The piston 10 is quickly positioned and fixed in posture by the mold base 6. Under the drive of the drive component 4, the piston 10 is subjected to riveting operation by pressing inward or expanding outward at the press end. This is transformed into rigid constraint brought about by the deformation of the piston 10's own structure. The fixing method is changed from the fit of assembly force to the locking of structural deformation, which provides a lasting guarantee for the sealing performance of the solenoid valve.

[0024] In a preferred embodiment, two sets of molding assemblies are provided on the intermediate plate 3; one set of molding assemblies is used to press the gasket 30 abutting against one end of the valve port into the piston 10, and the other set of molding assemblies is used to press the gasket 30 abutting against one end of the valve needle into the piston 10; and two drive assemblies 4 are provided on the top plate 2 corresponding to the two sets of molding assemblies.

[0025] Each drive assembly 4 has a drive rod connected to the intermediate plate 3, which can independently or synchronously control the riveting action of the corresponding molding head 5, ensuring the precise control of the two assembly operations. The two molding assemblies can operate synchronously on the same intermediate plate 3. After the operator positions the piston 10, the gasket 30 and the sealing block 20 can be placed at the same time. Through the synchronous control of the two drive assemblies 4, the gaskets 30 at both ends can be clamped and riveted synchronously in one go. Compared with step assembly, the assembly time of a single piston 10 is shortened.

[0026] When pressing the sealing block 20, the positioning structure is set as a protrusion 6a, which is embedded in the mounting groove of the gasket 30; the riveting structure is set as a concave surface 5a, the bottom surface of the concave surface 5a is used to press the sealing block 20 into the central groove, and the inclined surface of the concave surface 5a at the edge is used to press the side wall of the central groove inward.

[0027] The protrusion 6a can be precisely embedded into the mounting groove of the gasket 30 of the piston 10, achieving deep positioning of the piston 10 and the mold base 6. The concave surface 5a consists of a bottom surface and an edge inclined surface. The bottom surface of the concave surface 5a is a flat plane that matches the top surface of the sealing block 20. During riveting, it can form full-area contact with the sealing block 20, uniformly transmitting the pressure of the drive component 4 to the sealing block 20, ensuring that the sealing block 20 is smoothly and completely pressed into the central groove of the piston 10. During the riveting process, the edge inclined surface will generate an inward component force along the inclined direction on the side wall of the central groove of the piston 10, forcing the groove wall material to undergo plastic deformation towards the center, forming a ring-shaped protrusion 6a around the periphery of the sealing block 20. This protrusion 6a is directly stuck on the outer periphery of the sealing block 20, firmly locking the sealing block 20 in the central groove, completely preventing the sealing block 20 from loosening or shifting due to vibration or fluid impact during subsequent use.

[0028] When pressing the sealing block 20, the positioning structure is set as a groove 6b so that one end of the sealing block 20 is inserted; the riveting structure is set as a tip 5b, which uses a conical surface to expand the inner wall of the gasket 30 mounting groove outward.

[0029] The groove 6b structure forms a complete fit with the end of the piston 10 with the sealing block 20. This all-dimensional positioning ensures that the mounting groove of the gasket 30 of the piston 10 is completely coaxial with the tip 5b, providing a reference for the precise application of force during the subsequent expansion of the tip 5b and avoiding uneven expansion of the mounting groove sidewall due to piston 10 offset. During riveting, the conical surface contacts the inner sidewall of the mounting groove in an annular manner. The pressure of the drive component 4 is converted into an outward radial expansion force through the conical surface, causing the sidewall of the mounting groove to deform uniformly along the circumference, forming an expansion locking edge that matches the outer circumference of the gasket 30. This not only achieves mechanical fixation but also enhances the sealing effect.

[0030] In this invention, the drive rod of the drive assembly 4 is collinear with the axis of the molding head 5; the drive rod of the drive assembly 4 is connected to the top surface of the intermediate plate 3 through the quick-connect structure 7, and the molding head 5 is fixed to the bottom surface of the intermediate plate 3, forming a rigid power transmission chain of drive rod, intermediate plate 3, and molding head 5, so that all the power of the drive assembly 4 is transmitted along the axis of the molding head 5, without additional lateral force, and the molding head 5 and piston 10 only bear axial pressure, reducing the wear rate of both and extending the service life of the tooling and piston 10.

[0031] As a preferred embodiment of the above, the quick-connect structure 7 includes a transition shaft 71 and a limiting plate 72; the limiting plate 72 is fixed on the intermediate plate 3 and has a through T-shaped groove; the end of the transition shaft 71 is provided with a boss, one end of the transition shaft 71 with the boss is connected to the T-shaped groove, and the other end is threadedly connected to the drive rod of the drive assembly 4.

[0032] One end of the transition shaft 71 is integrally formed with a boss, the size of which matches the large end of the T-shaped slide groove, and the other end is provided with an external thread. During assembly, the end of the transition shaft 71 with the boss slides into the T-shaped slide groove and moves along the groove to the preset position, so as to achieve axial limiting engagement with the limiting plate 72. The threaded end is threadedly connected to the drive rod of the drive assembly 4, forming a rigid rod-shaped power transmission path without flexible connection links. It can withstand large axial pressure without bending deformation, ensuring structural stability during riveting.

[0033] In the preferred embodiment of this utility model, guide components 8 are symmetrically provided on both sides of the molding assembly, and guide components 8 are also provided on both sides of the driving assembly 4. The guide components 8 on both sides can counteract the eccentric force, ensuring that the intermediate plate 3 always moves in a straight line in a direction perpendicular to the base plate 1, and preventing the molding head 5 from tilting.

[0034] Preferably, the guide assembly 8 includes a guide rod and a linear bearing slidably mounted on the guide rod; the linear bearing is slidably mounted along the axial direction of the guide rod. This ensures that the axis of the molding head 5 remains parallel to the axis of the guide rod during the movement of the intermediate plate 3, guaranteeing that the molding head 5 accurately aligns with the piston 10 mounting position within the mold base 6 each time it descends. This controls the coaxiality of the seal assembly and prevents problems such as seal misalignment or incomplete compaction caused by insufficient guiding accuracy.

[0035] In this invention, the drive assembly 4 is either an electric cylinder or a pneumatic cylinder. By adjusting the drive air pressure or setting the stroke of the electric cylinder, the deformation of the piston 10 bore wall can be precisely controlled, ensuring that the deformation is sufficient to form an effective lock while avoiding excessive deformation that could damage the piston 10.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A riveting fixture for piston assembly, characterized in that, include: Base plate; The top plate is set parallel to the bottom plate and is connected to the bottom plate via a group of connecting columns; An intermediate plate is located between the top plate and the bottom plate; A drive assembly is disposed above the top plate, and its drive rod passes through the top plate and connects to the intermediate plate; A molding assembly, disposed between the intermediate plate and the base plate, includes a molding head and a mold base. The molding head is fixed on the intermediate plate, and the mold base is fixed on the base plate. The mold base and the molding head are coaxially arranged. The mold base is provided with a positioning structure for placing one end of the piston; The riveting structure at the end of the molding head is used to press the piston end inward or expand it outward to install and fix the sealing block and gasket inside the piston.

2. The riveting fixture for piston assembly according to claim 1, characterized in that, Two sets of the molding assemblies are disposed on the intermediate plate; One set of the molding assemblies is used to press a gasket abutting one end of the valve port into a piston, and another set of the molding assemblies is used to press a gasket abutting one end of the valve needle into a piston. Furthermore, two drive components are provided on the top plate corresponding to the two sets of molding components.

3. The riveting fixture for piston assembly according to claim 1, characterized in that, The positioning structure is configured as a protrusion, which is embedded in the mounting groove of the gasket; The riveting structure is configured as a concave surface. The bottom surface of the concave surface is used to press the sealing block into the central groove, while the inclined surface of the concave surface at the edge is used to press the sidewall of the central groove inward.

4. The riveting fixture for piston assembly according to claim 1, characterized in that, The positioning structure is configured as a groove for the end with the sealing block to be inserted; The riveting structure is configured with a top point, which uses a conical surface to expand the inner wall of the gasket mounting groove outward.

5. The riveting fixture for piston assembly according to claim 1, characterized in that, The drive rod of the drive assembly is collinear with the axis of the molding head; The drive rod of the drive assembly is connected to the top surface of the intermediate plate via a quick-connect structure, and the molding head is fixed to the bottom surface of the intermediate plate.

6. The riveting fixture for piston assembly according to claim 5, characterized in that, The quick-connect structure includes a transition shaft and a limiting plate; The limiting plate is fixed to the intermediate plate, and the limiting plate is provided with a through T-shaped groove; The end of the transition shaft is provided with a boss. One end of the transition shaft with the boss is connected to the T-shaped slide groove, and the other end is threadedly connected to the drive rod of the drive assembly.

7. The riveting fixture for piston assembly according to claim 1, characterized in that, The molding assembly is provided with guide components on both sides symmetrically.

8. The riveting fixture for piston assembly according to claim 1, characterized in that, The drive assembly has guide components on both sides.

9. The riveting fixture for piston assembly according to claim 7 or 8, characterized in that, The guide assembly includes a guide rod and a linear bearing slidably mounted on the guide rod; The linear bearing is slidably disposed along the axial direction of the guide rod.

10. The riveting fixture for piston assembly according to claim 1, characterized in that, The drive assembly is either an electric cylinder or a pneumatic cylinder.

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