Rotational molding lining plug for fire extinguisher tank body

Abstract

The utility model provides a fire extinguisher tank rotational moulding lining plug, including the plug main part, the plug main part includes a first cylinder part, a second cylinder part, an octagonal head part and a groove, the first cylinder part is located the one side of the second cylinder part far away from the octagonal head part, the bottom of the groove is provided with a mounting hole, the octagonal head part is located in the mounting hole, and the octagonal head part is located in the mounting hole. The side face of the first cylindrical part is provided with an external thread connected with the opening of the tank body, the side face of the second cylindrical part is provided with at least two air holes, and the air holes are communicated with the groove; and the ventilation pipe is detachably arranged in the mounting hole in a penetrating manner. According to the utility model, the phenomenon that air in a circle of gap between the bottom of the plug and the bottom of the internal thread of the tank opening cannot be smoothly discharged, so that the plastic lining part of the tank opening forms a hollow drum or a bubble pit after cooling molding is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotomolding process technical field, concretely relates to a kind of for fire extinguisher tank body rotomolding inner lining plug. BACKGROUND

[0002] Rotomolding is a common plastic forming process, in fire extinguisher tank body production, rotomolding lining is an important process to ensure the internal chemical stability and sealing of tank body, by rotomolding a layer of plastic lining inside the tank body, it can prevent fire extinguishing agent from chemical reaction with tank body metal, and avoid fire extinguishing agent leakage.

[0003] As Figure 1 As shown in the prior art rotomolding process, the tank opening is usually screwed and sealed with a plug with just the right depth, the traditional plug side is full thread, and when the plug is installed on the tank opening, the head lower end surface of the plug is completely matched with the tank opening end, the bottom of the plug and the bottom position of the tank opening inner thread have a gap, but the upper end of the tank opening is sealed, and then due to the melting and flowing of plastic powder, air is easily trapped in the gap at the bottom position of the tank opening inner thread, which cannot be smoothly discharged, resulting in hollowing or bubble pit (as shown in Figure 1 a) in the tank opening lining plastic part after cooling and forming, which will reduce the pressure-bearing performance of the tank. Therefore, it is urgent to design a rotomolding lining plug that can solve the problem of hollowing or bubble pit in the tank opening lining plastic part. SUMMARY

[0004] The utility model provides a rotomolding lining plug for fire extinguisher tank body, which can effectively solve the above problems.

[0005] The utility model is implemented as follows:

[0006] A rotomolding lining plug for fire extinguisher tank body, comprising:

[0007] The plug body comprises a first cylindrical part, a second cylindrical part, an octagonal head and a groove, the first cylindrical part is located on the side of the second cylindrical part away from the octagonal head, the bottom of the groove is provided with a mounting hole, the side surface of the first cylindrical part is provided with external threads connected with the tank opening, the side surface of the second cylindrical part is provided with at least two air vents, and the air vents are in communication with the groove;

[0008] The vent pipe is detachably arranged in the mounting hole.

[0009] As a further improvement, the side surface of the vent pipe is provided with a first boss, and the first boss is used to limit the length of the vent pipe passing through the mounting hole.

[0010] As a further improvement, a second boss is arranged inside the vent pipe and close to the lower end face, a third boss is arranged in the space between the second boss and the third boss, and the space between the second boss and the third boss is filled with filter cotton.

[0011] As a further improvement, a filter screen is arranged on the side of the third boss close to the second boss.

[0012] As a further improvement, the vent pipe is made of polytetrafluoroethylene.

[0013] As a further improvement, the plug body is made of brass.

[0014] The beneficial effects of the present application are as follows:

[0015] By arranging the first cylindrical part and the second cylindrical part on the plug body, the side surface of the first cylindrical part is provided with external threads connected with the opening of the tank body, and the side surface of the second cylindrical part is provided with at least two air vents, which are communicated with the grooves. When the tank body is in a heating and rotating state and the plastic powder starts to melt and flow, the air trapped between the bottom of the plug and the gap between the bottom of the internal threads of the opening of the tank body can flow along the gap between the thread cooperation and be discharged to the outside through the air vents on the second cylindrical part. The air cannot be smoothly discharged, which causes the plastic lining part of the opening of the tank body to form a hollow drum or a bubble pit after cooling and forming. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 is a structure diagram of the existing plug for the plastic lining part of the opening of the tank body after cooling and forming a hollow drum or a bubble pit.

[0018] Figure 2 is an explosion view of the plug provided by the embodiments of the present application.

[0019] Figure 3 is a cross-sectional structure diagram provided by the embodiments of the present application.

[0020] Figure 4 is an installation diagram provided by the embodiments of the present application.

[0021] Reference signs:

[0022] 1, plug main body; 11, first cylindrical part; 12, second cylindrical part; 121, air hole; 13, octagonal head; 14, groove;

[0023] 2, air pipe; 21, first boss; 22, second boss; 23, third boss; 24, filter cotton; 25, filter screen;

[0024] 3, tank body; 31, tank body opening. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0026] In the description of the present application, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0027] Referring to Figures 2-4 As shown in FIG. 1, a roll molding inner liner plug for fire extinguisher tank 3 includes:

[0028] The plug body 1 includes a first cylindrical part 11, a second cylindrical part 12, an octagonal head part 13, and a groove 14. When the plug is installed, the lower end face of the octagonal head part 13 is attached to the end face of the tank body opening 31, and the two are attached to facilitate positioning of the thickness of the plastic lining part of the tank body opening 31. The diameter of the second cylindrical part 12 is smaller than the diameter of the first cylindrical part 11, and the diameter of the second cylindrical part 12 is also smaller than the diameter of the internal thread of the tank body opening 31, so as to ensure that the plug can be normally assembled to the tank body opening 31. The first cylindrical part 11 is located on the side of the second cylindrical part 12 away from the octagonal head part 13. The bottom of the groove 14 is provided with a mounting hole. The side of the first cylindrical part 11 is provided with external threads for connecting with the tank body opening 31. The side of the second cylindrical part 12 is provided with at least two air vents 121, which communicate with the groove 14. When the tank body 3 is in a heated rotating state and the plastic powder begins to melt and flow, the air trapped between the bottom of the plug and the gap between the bottom of the internal thread of the tank body opening 31 can flow along the gap between the threaded connection and be discharged to the outside through the air vents 121 on the second cylindrical part 12. At least two air vents 121 are provided to avoid the accumulation of impurities in a single air vent 121 during long-term use, which can cause the air venting effect to decrease if not checked in time, affecting the rotational molding quality. The probability of both air vents 121 being blocked at the same time is relatively small. The height of the first cylindrical part 11 is affected by the height of the tank body opening 31. The height of the first cylindrical part is such that the length of the external threads can normally fix the plug to the tank body opening 31.

[0029] There is also a vent pipe 2 which is detachably arranged in the mounting hole. The length of the vent pipe 2 passing through the mounting hole is greater than the thickness of the tank body 3 that needs to be lined with plastic, and the vent pipe 2 can be replaced to ensure that the gas in the tank body 3 can be discharged during rotational molding.

[0030] Specifically, to facilitate the installation of the vent pipe 2 and position the length of the vent pipe 2 passing through the mounting hole, a first flange 21 is arranged on the side of the vent pipe 2 to limit the length of the vent pipe 2 passing through the mounting hole. After the rotational molding is completed, the plug needs to be rotated and pulled out, and the first flange 21 can also prevent the vent pipe 2 from falling off the mounting hole during disassembly.

[0031] Specifically, a second flange 22 is arranged on the inner side of the vent pipe 2 close to the lower end face, and a third flange 23 is arranged at a distance from the second flange 22. Filter cotton 24 is filled between the second flange 22 and the third flange 23. By arranging filter cotton on the inner side of the vent pipe 2, impurities can be prevented from entering the inside of the tank body 3 or plastic powder can be prevented from being poured out during rotational molding. The second flange 22 and the third flange 23 can limit the position of the filter cotton, which is not easy to fall out. The filter cotton can be replaced according to actual use.

[0032] Specifically, the filter screen 25 is arranged on the side of the third boss 23 close to the second boss 22, so that the filter cotton can be prevented from being blown out by the heated and expanded gas in the tank body 3.

[0033] Specifically, the vent pipe 2 is made of polytetrafluoroethylene, and the commonly used inner lining material is PP or PE. The surface of the polytetrafluoroethylene is highly non-stick, and most substances are difficult to adhere to the surface. The non-stick property hinders the plastic lining from being easily bonded, so that the plug is convenient to disassemble.

[0034] Specifically, the plug body 1 is made of brass. The brass has good casting and processing performance, and can be processed into a plug with precise shape through various processing methods. Whether through turning, milling or casting process, the plug meeting the requirements can be produced relatively easily.

[0035] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roll molded liner plug for fire extinguisher cylinder, characterized in that, The application relates to a vent plug, which comprises the following parts: a plug main body (1) which comprises a first cylindrical part (11), a second cylindrical part (12), an octagonal head part (13) and a groove (14), the first cylindrical part (11) being located on the side of the second cylindrical part (12) away from the octagonal head part (13), the bottom of the groove (14) being provided with a mounting hole, the side of the first cylindrical part (11) being provided with external threads which are connected with the opening (31) of a tank body, the side of the second cylindrical part (12) being provided with at least two air permeation holes (121), the air permeation holes (121) being communicated with the groove (14); an air pipe (2) which is detachably arranged in the mounting hole.

2. A roll molded liner plug for a fire extinguisher tank body according to claim 1, wherein The side of the air pipe (2) is provided with a first boss (21) which is used for limiting the length of the air pipe (2) penetrating through the mounting hole.

3. A roll molded liner plug for a fire extinguisher tank body according to claim 2, wherein The inner side of the air pipe (2) and close to the lower end face is provided with a second boss (22), a third boss (23) is arranged at intervals with the second boss (22), and filter cotton (24) is filled between the second boss (22) and the third boss (23).

4. A roll molded liner plug for a fire extinguisher tank body according to claim 3, wherein The third boss (23) is further provided with a filter screen (25) on the side close to the second boss (22).

5. A roll molded liner plug for a fire extinguisher tank body according to any one of claims 1 to 4, characterized in that, The air pipe (2) is made of polytetrafluoroethylene.

6. A roll molded liner plug for a fire extinguisher tank body according to any one of claims 1 to 4, characterized in that, The plug main body (1) is made of brass.

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