Pneumatic needle valve structure of pipeline inner wall spraying machine

Abstract

The utility model discloses a pneumatic needle valve structure of a pipeline inner wall spraying machine, which comprises a fixed cap, a valve body and a feed pipe, the tail end of the feed pipe is connected with a material injection nozzle, one end of the valve body close to the fixed cap is provided with a sinking groove, a piston rod is inserted in the sinking groove, a first spring is connected with the fixed cap, the tail end of the piston rod is connected with a valve needle, and the valve needle passes through a sealing plug. A material conveying pipeline is arranged in the material injection nozzle, the head of the valve needle blocks the material conveying pipeline, a first blocking piece is fixed to the valve needle, a second spring is arranged between the first blocking piece and the sealing plug, and meanwhile the valve body is provided with an air inlet communicated with the sinking groove. The opening degree of the valve needle can be flexibly adjusted by adjusting the positions of the piston rod and the threaded cap, so that different spraying requirements are met, the flexibility and universality of equipment are improved, and when the device is not used, the valve needle blocks the through hole under the action of the second spring, so that material leakage is effectively prevented; during use, the pneumatic needle valve can be quickly opened to ensure that materials quickly enter the material conveying pipeline, so that the spraying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline spraying technology, specifically to a pneumatic needle valve structure for a pipeline inner wall spraying machine. Background Technology

[0002] Pipe interior coating machines are specialized equipment for coating the interior of pipes, widely used in petroleum, chemical, and municipal engineering fields. Their ingenious design effectively solves the problems of low efficiency and inconsistent quality associated with traditional manual coating. Pipe interior coating machines can be controlled in various ways, including using pneumatic needle valves. A pneumatic needle valve is a device that uses compressed air as a power source to control fluid flow through a precision needle valve mechanism. In coating equipment, it can precisely control the amount of paint sprayed and the start and stop of spraying, thus achieving precise control of the spraying process.

[0003] Traditional pneumatic needle valves may lack a flexible adjustment mechanism, making it difficult to adapt to different spraying needs and limiting the versatility of the equipment. Moreover, the lack of an effective leak-proof design can lead to material leakage when not in use, resulting in material waste and environmental pollution. In addition, their complex connection methods increase the difficulty of equipment maintenance, raising maintenance costs and time. Utility Model Content

[0004] The purpose of this invention is to solve the problems that traditional pneumatic needle valves may not have a flexible adjustment mechanism, making it difficult to adapt to different spraying needs and limiting the versatility of the equipment; moreover, the lack of an effective leak-proof design will lead to material leakage when not in use, resulting in material waste and environmental pollution; in addition, the complex connection method will increase the difficulty of equipment maintenance, increase maintenance costs and time.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: It provides a pneumatic needle valve structure for a pipe inner wall spraying machine, wherein the pipe inner wall spraying machine includes a column and a support adjustment seat slidably mounted on the column. A mounting bracket is connected to the support adjustment seat, and a spraying mechanism is connected to one end of the support. A pneumatic needle valve is connected between the spraying mechanism and the column. The pneumatic needle valve includes a fixing cap threadedly connected to one end of the column, a valve body threadedly connected to one end of the fixing cap, and a feed pipe threadedly connected to one end of the valve body. The threaded connection is equipped with a filling nozzle; a groove is formed at one end of the valve body near the fixed cap, a piston rod is inserted into the groove, a first spring is provided between the piston rod and the fixed cap, a valve needle is connected to one end of the piston rod, and the valve needle passes through the sealing plug provided at the inlet of the feed pipe; a feed pipe is formed inside the filling nozzle, the head of the valve needle blocks the feed pipe, a first blocking plate is fixed on the valve needle, and a second spring is installed between the first blocking plate and the sealing plug; an air inlet is formed on the valve body, and the air inlet communicates with the groove.

[0006] Furthermore, a cavity is formed at one end of the piston rod, a second blocking plate is fixedly provided at one end of the valve needle and extends into the cavity, and a threaded cap is threadedly installed at one end of the piston rod, with the valve needle passing through the threaded cap.

[0007] Furthermore, the feed pipe has a T-shaped structure, and its two ends are threadedly connected to the valve body and the injection nozzle, respectively. The feed pipe has a feed port at one end.

[0008] Furthermore, a feeding component is fitted inside the end of the injection nozzle that is connected to the feed pipe, and a through hole communicating with the conveying pipe is opened in the feeding component.

[0009] Furthermore, the valve needle penetrates the feed tube, and the head of the valve needle blocks the through hole.

[0010] Furthermore, both ends of the valve body are provided with screw-stopping holes, and screws are installed in the screw-stopping holes to prevent the valve body and the feed pipe from sliding. One end of the feed pipe is screwed with a threaded locking plate that locks itself to the valve body.

[0011] Furthermore, the injection nozzle is threadedly connected to the spraying mechanism.

[0012] Furthermore, an air nozzle is installed at the air inlet.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By adjusting the position of the piston rod and the threaded cap, the opening degree of the valve needle can be flexibly adjusted to adapt to different spraying needs, thereby improving the flexibility and versatility of the equipment.

[0015] 2. When not in use, the valve needle blocks the through hole under the action of the second spring, effectively preventing material leakage and reducing material waste and environmental pollution; when in use, the pneumatic needle valve can open quickly to ensure that the material enters the conveying pipeline quickly, thereby improving the spraying efficiency.

[0016] 3. The threaded connection design between the components makes the disassembly and maintenance of the equipment more convenient, reducing maintenance costs and time.

[0017] 4. The design of the screw stop hole and screw, as well as the use of the threaded locking plate, ensures the stability and reliability of the pneumatic needle valve structure and reduces failures caused by loosening. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is the right view of the present invention;

[0020] Figure 3 This is a schematic diagram of the valve needle blocking the through hole when no air is supplied according to this utility model;

[0021] Figure 4 This is a schematic diagram illustrating the upward movement of the valve needle for material injection under ventilated conditions according to this invention.

[0022] Figure 5 This is an exploded view of the present invention;

[0023] Figure 6 This is a schematic diagram of the pneumatic needle valve and the pipe inner wall spraying machine.

[0024] In the diagram: 1-Column, 2-Bracket Adjustment Seat, 3-Bracket, 4-Spraying Mechanism, 5-Pneumatic Needle Valve, 6-Fixing Cap, 7-Valve Body, 8-Feed Pipe, 9-Injection Nozzle, 10-Piston Rod, 11-First Spring, 12-Valve Needle, 13-Sealing Plug, 14-Second Spring, 15-Threaded Cap, 16-Feeding Component, 17-Threaded Locking Plate, 18-Air Nozzle;

[0025] 71-Settling tank, 72-Air inlet, 73-Fiber stop hole, 81-Feed inlet, 91-Feeding pipe, 101-Cavity, 121-First baffle plate, 122-Second baffle plate, 161-Through hole. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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] Combination Figures 1 to 6 The diagram shows a pneumatic needle valve structure for a pipe inner wall spraying machine, wherein the pipe inner wall spraying machine includes a column 1 and a bracket adjustment seat 2 slidably mounted on the column 1, a bracket 3 is connected and installed on the bracket adjustment seat 2, a spraying mechanism 4 is connected to one end of the bracket 3, and a pneumatic needle valve 5 is connected between the spraying mechanism 4 and the column 1.

[0029] like Figure 6 The pipe inner wall spraying machine is first placed inside the pipe during use. Then, the expansion or contraction of the support 3 is adjusted by stretching the support adjustment seat 2 on the column 1. After fixing and supporting, the rollers connected to the support 2 can roll on the inner wall of the pipe. During spraying, the operator can use ropes to pull the pipe inner wall spraying machine to move it and use the spraying mechanism 4 to spray the inner wall of the pipe. The spraying mechanism 4 includes a rotating mechanism that allows the spray gun connected to its head to rotate continuously in a circular motion, thereby spraying the inner wall of the pipe in a circular motion.

[0030] The above describes the usage of a pipe inner wall spraying machine, while this utility model relates to a pneumatic needle valve structure for a pipe inner wall spraying machine; the pneumatic needle valve 5 includes a fixing cap 6 threadedly connected to one end of a column 1, a valve body 7 threadedly connected to one end of the fixing cap 6, a feed pipe 8 threadedly connected to one end of the valve body 7, and a filling nozzle 9 threadedly connected to one end of the feed pipe 8; a groove 71 is provided at the end of the valve body 7 near the fixing cap 6, and a piston rod 10 is inserted into the groove 71. A first spring 11 is provided between the piston rod 10 and the fixed cap 6. A valve needle 12 is connected to one end of the piston rod 10. The valve needle 12 passes through the sealing plug 13 set at the opening of the feed pipe 8. A feed pipe 91 is opened in the injection nozzle 9. The head of the valve needle 12 blocks the feed pipe 91. A first blocking plate 121 is fixed on the valve needle 12. A second spring 14 is installed between the first blocking plate 121 and the sealing plug 13. An air inlet 72 is opened on the valve body 7. The air inlet 72 is connected to the settling tank 71.

[0031] A cavity 101 is opened at one end of the piston rod 10, and a second blocking plate 122 is fixedly provided at one end of the valve needle 12 and extends into the cavity 101. A threaded cap 15 is installed at one end of the piston rod 10 by thread, and the valve needle 12 passes through the threaded cap 15. The feed pipe 8 has a T-shaped structure, and its two ends are threadedly connected to the valve body 7 and the injection nozzle 9, respectively. A feed port 81 is opened at one end of the feed pipe 8. A feed element 16 is installed inside the end of the injection nozzle 9 connected to the feed pipe 8. A through hole 161 communicating with the conveying pipe 91 is opened in the feed element 16. The valve needle 12 passes through the feed pipe 8, and the head of the valve needle 12 blocks the through hole 161. The injection nozzle 9 is threadedly connected to the spraying mechanism 4. An air nozzle 18 is installed at the air inlet 72. The feed pipe 8 inputs the spraying material through the feed port 81.

[0032] Specifically, when using the pneumatic needle valve of the pipe inner wall spraying machine:

[0033] 1. For example Figure 3 As shown, when not in use, the piston rod 10 sinks into the bottom of the sink 71, and the valve needle 12 at one end is pushed down by the elastic force of the second spring, thereby blocking the through hole 161 of the feed component 16 to prevent the spraying material from entering the spraying mechanism 4 through the conveying pipe 91.

[0034] 2. For example Figure 4As shown, during use, the external air pump is started to inject gas into the settling tank 71 through the air nozzle 18. The gas then pushes the piston rod 10 upward, which drives the threaded cap 15. The threaded cap 15 drives the second blocking plate 122 to move upward, thereby pulling the valve needle 12 upward as well. At this time, the first blocking plate 121 on the valve needle 12 compresses the second spring 14 upward. As the valve needle 12 moves upward, the through hole 161 on the feed part 16 that was previously blocked is opened, and the material quickly enters the conveying pipe 91 through the through hole 161, and then enters the spraying mechanism 4 for spraying.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pneumatic needle valve structure for a pipe inner wall spraying machine, wherein the pipe inner wall spraying machine includes a column (1) and a bracket adjustment seat (2) slidably mounted on the column (1), a bracket (3) is connected to the bracket adjustment seat (2), a spraying mechanism (4) is connected to one end of the bracket (3), and a pneumatic needle valve (5) is connected between the spraying mechanism (4) and the column (1), characterized in that: The pneumatic needle valve (5) includes a fixing cap (6) threaded to one end of the column (1), a valve body (7) threaded to one end of the fixing cap (6), a feed pipe (8) threaded to one end of the valve body (7), and a filling nozzle (9) threaded to one end of the feed pipe (8). A groove (71) is provided at one end of the valve body (7) near the fixed cap (6). A piston rod (10) is inserted in the groove (71). A first spring (11) is provided between the piston rod (10) and the fixed cap (6). A valve needle (12) is connected to one end of the piston rod (10). The valve needle (12) passes through the sealing plug (13) provided at the opening of the feed pipe (8). A conveying pipe (91) is provided in the injection nozzle (9). The head of the valve needle (12) blocks the conveying pipe (91). A first blocking plate (121) is fixed on the valve needle (12). A second spring (14) is installed between the first blocking plate (121) and the sealing plug (13). An air inlet (72) is provided on the valve body (7). The air inlet (72) is connected to the groove (71).

2. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 1, characterized in that: One end of the piston rod (10) has a cavity (101), and one end of the valve needle (12) is fixedly provided with a second blocking plate (122) and extends into the cavity (101). One end of the piston rod (10) is threadedly fitted with a threaded cap (15), and the valve needle (12) passes through the threaded cap (15).

3. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 2, characterized in that: The feed pipe (8) has a T-shaped structure, and its two ends are threadedly connected to the valve body (7) and the injection nozzle (9) respectively. The feed pipe (8) has a feed port (81) at one end.

4. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 3, characterized in that: A feeding component (16) is fitted inside the end of the injection nozzle (9) that is connected to the feed pipe (8), and a through hole (161) communicating with the conveying pipe (91) is opened in the feeding component (16).

5. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 4, characterized in that: The valve needle (12) penetrates the feed tube (8), and the head of the valve needle (12) blocks the through hole (161).

6. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 5, characterized in that: Both ends of the valve body (7) are provided with screw-stopping holes (73). Screws are installed in the screw-stopping holes (73) to prevent the valve body (7) and the feed pipe (8) from sliding. One end of the feed pipe (8) is screwed with a threaded locking piece (17) that locks itself to the valve body (7).

7. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 6, characterized in that: The injection nozzle (9) is threadedly connected to the spraying mechanism (4).

8. The pneumatic needle valve structure of the pipe inner wall spraying machine according to claim 7, characterized in that: An air nozzle (18) is installed at the air inlet (72).

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