Special inching valve for two-component coating

Abstract

The inching valve comprises a valve seat and a valve body shell, a piston is installed in the valve body shell through a compression spring, the left end of the piston is connected with a piston rod extending out of the valve body shell, and an organ sealing plug assembly is arranged at the output end of the piston rod; the organ sealing plug assembly comprises a front end sealing plug, an organ structure connecting section and a rear end sealing gasket which are sequentially arranged from left to right, the organ sealing plug assembly is arranged in a matching cavity of the valve seat, and the rear end sealing gasket is assembled at the left end of the valve body shell; according to the inching valve, paint or a curing agent is thoroughly isolated from the piston rod and the valve body shell, damage to a sealing ring caused by particles and adhesion after the paint is cured is avoided, sealing of the piston rod is effectively protected, and the service life of the whole inching valve is prolonged.

Description

Technical Field

[0001] This invention relates to the field of micro-valve structure technology, and in particular to a novel micro-valve specifically for two-component coatings, which is used for the on / off control of the curing agent and the on / off control of the mixed coating in two-component coating. Background Technology

[0002] The micro valve controls the movement of the piston by switching compressed air on and off, thereby controlling the paint coating process.

[0003] Currently, two-component coatings are widely used in the coating industry, commonly referred to as "two-component paints." These paints consist of two parts: a base agent and a hardener, which are mixed together. The base agent forms the paint film, achieving the desired color, corrosion resistance, and other properties; the hardener acts as a catalyst, allowing the base agent to cure quickly and form a film rapidly.

[0004] The intermediate curing agent in two-component coatings has high viscosity and is very easy to cure and deteriorate when exposed to air, which can cause poor paint film quality and equipment blockage.

[0005] In two-component paint spraying, an automatic mixing device is generally included, and the main agent and the curing agent have independent flow control systems. In previous designs, the main agent and the curing agent usually used the same control method and the same control mechanism. Due to the special nature of the curing agent, its control system is prone to problems such as blockage and adhesion at the valve position, which can lead to the failure of the micro valve seal, damage to the micro valve, and even affect the operation of the system.

[0006] For example, attached Figure 3 In the conventional micro-valve structure shown, the left end face of the valve body and part of the piston rod are in direct contact with the coating in the assembly cavity of the valve seat. Point A is usually the position of the piston rod sealing ring, where the cured coating tends to accumulate. Cured coating entering the Y-shaped sealing ring cavity at this position is easily damaged. Cured coating tends to adhere to the piston rod at point B. Cured coating tends to accumulate in the corner of the sealing plug at point C. After curing, the coating will enter the sealing gap with the reciprocating motion of the piston rod, and the piston rod seal will quickly fail.

[0007] In summary, there is a need to invent a micro-valve for use with curing agents to solve the above problems. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an improved micro valve for two-component coatings in order to overcome the shortcomings of the prior art.

[0009] The technical scheme of the present application is as follows: a micro valve special for two-component coating, comprising a valve seat and a valve body shell, a piston is installed in the valve body shell through a compression spring, a piston rod extending out of the valve body shell is connected to the left end of the piston, and an organ seal plug assembly is arranged on the output end of the piston rod;

[0010] The organ seal plug assembly comprises a front end seal plug, an organ structure connecting section and a rear end seal pad arranged in sequence from left to right, the organ seal plug assembly is arranged in a matching cavity of the valve seat, and the rear end seal pad is assembled at the left end of the valve body shell.

[0011] The valve seat is provided with a coating inlet and a coating outlet, the coating outlet is communicated with the left end of the matching cavity, the coating inlet is communicated with the lower end of the matching cavity, and the front end seal plug blocks the coating outlet in the initial state.

[0012] The valve body shell is provided with a compressed air flow channel, the compressed air flow channel comprises a central flow channel arranged in the valve body shell, the central flow channel is communicated with a preset directional flow channel in the left piston, and the right end of the central flow channel is communicated with a compressed air interface at the right end of the valve body shell.

[0013] During operation, compressed air enters from the compressed air interface, sequentially passes through the central flow channel and the directional flow channel, then exerts a rightward thrust on the left end face of the piston, the piston and the piston rod make the compression spring elastically deform and then move rightward, finally drive the front end seal plug to move rightward and open the coating outlet; after the compressed air is interrupted, the compression spring restores the deformation, pushes the piston and the piston rod to move leftward, and makes the front end seal plug block the coating outlet again.

[0014] Further, the front end seal plug, the organ structure connecting section and the rear end seal pad are integrally formed.

[0015] Further, the front end seal plug, the organ structure connecting section and the rear end seal pad cover the part of the piston rod extending out of the left end of the valve body shell.

[0016] By adopting the above technical scheme, the direct contact between the coating and the piston rod and the valve body shell is completely blocked, and the damage of the sealing ring caused by the particles and adhesion of the solidified coating is avoided.

[0017] Further, the front end seal plug, the organ structure connecting section and the rear end seal pad are made of PTFE polytetrafluoroethylene material.

[0018] By adopting the above technical scheme, the PTFE polytetrafluoroethylene material has excellent hydrophobic property, can ensure that the coating is not easy to absorb and is easy to clean, and is not easy to accumulate the solidified coating.

[0019] Further, the left end face of the piston leaves a gap space with the inner wall of the valve body shell, and the gap space is communicated with the pointing flow channel;

[0020] By adopting the above technical scheme, the pointing flow channel can be obliquely arranged to communicate with the gap space, so that the compressed air can be directly forced from the left end face of the piston, thereby making the air thrust more direct and the switch action more efficient compared with the prior art in which the compressed air is introduced from the middle of the piston.

[0021] Further, the piston is further provided with a state indicating rod;

[0022] By adopting the above technical scheme, the state indicating rod moves with the piston to indicate the closing or opening state of the micro valve.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The present application adopts an integrated organ seal plug assembly structure, which can block the paint and curing agent after assembly, so that the paint or curing agent is completely isolated from the piston rod and the valve body shell, avoiding damage to the sealing ring caused by particles and adhesion of the cured paint, effectively protecting the seal of the piston rod, and prolonging the service life of the entire micro valve.

[0025] 2. The integrated organ seal plug assembly is made of PTFE (polytetrafluoroethylene) material, which has excellent hydrophobic properties to ensure that the paint is not easily adsorbed and is easy to clean, and is not easy to accumulate cured paint.

[0026] 3. The compressed air flow channel directly passes through the gap space between the left end face of the piston and the inner wall of the valve body shell, so that the pushing force of the compressed air is more direct, and the switch action is more efficient.

[0027] 4. The overall assembly structure and layout of the present application are more reasonable, easy to assemble, maintain and operate. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the present application;

[0029] Figure 2 is a structural schematic diagram of the organ seal plug assembly in the present application;

[0030] Figure 3 is a structural schematic diagram of the existing ordinary micro valve in the background art.

[0031] The figure shows the following: 1. valve seat, 2. valve body shell, 3. compression spring, 4. piston, 5. piston rod, 6. front end sealing plug, 7. organ structure connecting section, 8. rear end sealing gasket, 9. matching cavity, 10. coating inlet, 11. coating outlet, 12. central flow channel, 13. directional flow channel, 14. compressed air interface, 15. state indicating rod. DETAILED DESCRIPTION

[0032] The following detailed description of the embodiments of the present application is given on the premise of the technical solutions of the present application, and detailed implementation manners and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0033] As shown in the drawings, a two-component coating special micro valve comprises a valve seat 1 and a valve body shell 2, a piston 4 is installed in the valve body shell 2 through a compression spring 3, a piston rod 5 extending out of the valve body shell 2 is connected to the left end of the piston 4, and an organ sealing plug assembly is arranged on the output end of the piston rod 5. Figure 1 Figure 2 The organ sealing plug assembly comprises a front end sealing plug 6, an organ structure connecting section 7 and a rear end sealing gasket 8 arranged in sequence from left to right, the organ sealing plug assembly is arranged in a matching cavity 9 of the valve seat 1, and the rear end sealing gasket 8 is assembled at the left end of the valve body shell 2.

[0034] The organ sealing plug assembly comprises a front end sealing plug 6, an organ structure connecting section 7 and a rear end sealing gasket 8 arranged in sequence from left to right, the organ sealing plug assembly is arranged in a matching cavity 9 of the valve seat 1, and the rear end sealing gasket 8 is assembled at the left end of the valve body shell 2.

[0035] The valve seat 1 is provided with a coating inlet 10 and a coating outlet 11, the coating outlet 11 is in communication with the left end of the matching cavity 9, and the coating inlet 10 is in communication with the lower end of the matching cavity 9.

[0036] The valve body shell 2 is provided with a compressed air flow channel, the compressed air flow channel comprises a central flow channel 12 arranged in the valve body shell 2, the central flow channel 12 is in communication with a directional flow channel 13 prearranged in the left piston 4, and the right end of the central flow channel 12 is in communication with a compressed air interface 14 at the right end of the valve body shell 2.

[0037] The front end sealing plug 6, the organ structure connecting section 7 and the rear end sealing gasket 8 are integrally formed.

[0038] The front end sealing plug 6, the organ structure connecting section 7 and the rear end sealing gasket 8 cover the part of the piston rod 5 extending out of the left end of the valve body shell 2.

[0039] The front end sealing plug 6, the organ structure connecting section 7 and the rear end sealing gasket 8 are made of PTFE polytetrafluoroethylene material.

[0040] A gap space is left between the left end face of the piston 4 and the inner wall of the valve body shell 2, and the gap space is in communication with the directional flow channel 13. A state indicating rod 15 is further arranged on the piston 4. ​

[0041] Working principle:

[0042] In the initial state, the front end sealing plug 6 blocks the paint outlet 11, and the paint flows into the matching cavity 9 from the paint inlet 10.

[0043] In operation, compressed air enters from the compressed air interface 14, passes through the central flow channel 12 and the directional flow channel 13 in turn, and then enters the gap space between the left end face of the piston 4 and the inner wall of the valve body shell 2. Then, the rightward thrust is applied to the left end face of the piston 4, the piston 4 and the piston rod 5 make the compression spring 3 elastically deformed and move rightward, and finally drive the front end sealing plug 6 to move rightward to open the paint outlet 11. At this time, the paint in the matching cavity 9 flows out from the paint outlet 11;

[0044] After the compressed air is interrupted, the compression spring 3 restores the deformation and pushes the piston 4 and the piston rod 5 to move leftward, so that the front end sealing plug 6 blocks the paint outlet 11 again. The paint stops flowing out, and thus the on-off control of the paint is realized.

Claims

1. A microvalve for two-component coating applications, characterized by: The utility model relates to a valve seat (1) and valve body shell (2), the piston (4) is installed in the valve body shell (2) through compression spring (3), the piston rod (5) of the piston (4) left end is connected and projects the valve body shell (2), the output end of piston rod (5) is provided with the organ seal plug assembly; The organ seal plug assembly includes front end seal plug (6), organ structure connecting section (7) and rear end sealing pad (8) arranged in sequence from left to right, the organ seal plug assembly is arranged in the matching cavity (9) of the valve seat (1), and the rear end sealing pad (8) is assembled in the left end of the valve body shell (2). The valve seat (1) is provided with paint inlet (10) and paint outlet (11), the paint outlet (11) is communicated with the left end of the matching cavity (9), the paint inlet (10) is communicated with the lower end of the matching cavity (9), and the front end seal plug (6) blocks the paint outlet (11) in the initial state. The valve body shell (2) is provided with a compressed air flow channel, the compressed air flow channel includes a central flow channel (12) arranged in the valve body shell (2), the central flow channel (12) is communicated with a preset directional flow channel (13) in the left piston (4), and the right end of the central flow channel (12) is communicated with the compressed air interface (14) at the right end of the valve body shell (2). During operation, compressed air enters from the compressed air interface (14), sequentially passes through the central flow channel (12) and the directional flow channel (13), then exerts a rightward thrust on the left end face of the piston (4), the piston (4) moves rightward together with the piston rod (5) after the elastic deformation of the compression spring (3), and finally drives the front end seal plug (6) to move rightward and open the paint outlet (11); after the interruption of compressed air, the compression spring (3) restores the deformation, pushes the piston (4) and the piston rod (5) to move leftward, so that the front end seal plug (6) blocks the paint outlet (11) again.

2. A microvalve for two-component coating applications as claimed in claim 1, characterized in that: The front end seal plug (6), the organ structure connecting section (7) and the rear end sealing pad (8) are integrally formed.

3. A microvalve for two-component coating applications as claimed in claim 1, characterized in that: The front end seal plug (6), the organ structure connecting section (7) and the rear end sealing pad (8) cover the part of the piston rod (5) that projects out of the left end of the valve body shell (2).

4. A microvalve for two-component coating applications as claimed in claim 1, characterized in that: The front end seal plug (6), the organ structure connecting section (7) and the rear end sealing pad (8) are made of PTFE polytetrafluoroethylene material.

5. A microvalve for two-component coating applications as claimed in claim 1, characterized in that: The left end face of the piston (4) and the inner wall of the valve body shell (2) leave a gap space, and the gap space is communicated with the directional flow channel (13).

6. A microvalve for two-component coating applications as claimed in claim 1, characterized in that: The piston (4) is further provided with a state indicating rod (15).

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