CN215242383U - Roller and mould for forming sponge layer of roller - Google Patents

Abstract

The utility model provides a cylinder and the fashioned mould of sponge layer that is used for the cylinder. The mold comprises: the bottom cover comprises a first connecting part, a first chamfer forming part, a second connecting part and a base which are sequentially connected, wherein the first connecting part is used for fixing one end of the hard plastic inner pipe; the cylinder body comprises a cylinder body and a first axial cavity penetrating through the cylinder body, and one end of the first axial cavity is detachably sleeved outside the second connecting part; the shaft center cover comprises a shaft center cover body and a second axial cavity penetrating through the shaft center cover body, the shaft center cover body comprises a second chamfer forming part and a fixing groove, and the other end of the first axial cavity is detachably fixed in the fixing groove; the fixing plug comprises a fixing plug body, the fixing plug body comprises a third connecting portion and a fourth connecting portion, the third connecting portion is detachably sleeved in the second axial cavity, and the fourth connecting portion is used for fixing the other end of the hard plastic inner tube. The utility model discloses a simple, the readily removable washing of mould structure, the cylinder performance of preparing is very superior.

Description

Roller and mould for forming sponge layer of roller

Technical Field

The utility model belongs to the technical field of cleaning device, specifically, relate to a fashioned mould of polyethylene sponge layer of cylinder and be used for the cleaning cylinder.

Background

The application of roller type cleaning tools is very extensive, and the roller surface of the existing roller type cleaning tool is generally provided with a layer of water-absorbing material. The water absorbing material may be nylon, dacron, acrylic fiber, imitation cashmere, polyethylene, etc. The nylon, the terylene, the acrylic and the imitated cashmere are mostly fixed with the hard rotating shaft tube by an adhesion process, and the polyethylene is basically fixed on the surface of the hard interlayer by the adhesion process after injection molding.

The polyethylene has good water absorption and is more suitable for manufacturing cleaning rollers. However, the process of firstly performing injection molding and then bonding easily causes the eccentric condition when the polyethylene pipe sleeve subjected to injection molding is sleeved on the surface of the hard interlayer, and the bonding part is hardened due to the use of a large amount of glue, so that the cleaning efficiency of the roller is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first purpose provides a fashioned mould of polyethylene sponge layer that is used for this cleaning cylinder.

The second purpose of the utility model is to provide a novel cleaning roller.

The third purpose of the utility model is to provide a method for preparing the cleaning roller.

A fourth object of the present invention is to provide a cleaning tool including the drum.

The utility model provides a fashioned mould of sponge layer for cylinder, the cylinder include stereoplasm plastic inner tube with the sponge layer, its characterized in that, the mould includes:

the bottom cover comprises a first connecting part, a first chamfer forming part, a second connecting part and a base which are sequentially connected, wherein the first connecting part is used for fixing one end of the hard plastic inner pipe;

the cylinder body comprises a cylinder body and a first axial cavity penetrating through the cylinder body, and one end of the first axial cavity is detachably sleeved outside the second connecting part;

the shaft center cover comprises a shaft center cover body and a second axial cavity penetrating through the shaft center cover body, the shaft center cover body comprises a second chamfer forming part and a fixing groove, and the other end of the first axial cavity is detachably fixed in the fixing groove;

the fixing plug comprises a fixing plug body, the fixing plug body comprises a third connecting portion and a fourth connecting portion, the third connecting portion is detachably sleeved in the second axial cavity, and the fourth connecting portion is used for fixing the other end of the hard plastic inner tube.

According to some embodiments of the invention, the fixed plug further comprises a third axial cavity running through the fixed plug body.

According to some embodiments of the invention, the third axial chamber comprises a first chamber and a second chamber communicating with each other, the first chamber being provided with an exhaust gap.

According to some embodiments of the invention, the diameter of the second chamber is smaller than the diameter of the first chamber.

According to some embodiments of the invention, the one end of the first connecting portion is equipped with the direction section.

According to some embodiments of the utility model, the second connecting portion are equipped with first sealing washer holding tank.

According to some embodiments of the invention, the fixed slot is provided with a first cut edge.

According to some embodiments of the utility model, the third connecting portion are equipped with second sealing washer holding tank.

According to some embodiments of the utility model, the fixed stopper body is equipped with the second side cut.

According to some embodiments of the invention, the first chamfer forming portion comprises a first straight section and a first tapered section.

According to some embodiments of the invention, the angle of the first conical section is between 30 ° and 70 °.

According to some embodiments of the invention, the second chamfer forming section comprises a second straight section and a second tapered section.

According to some embodiments of the invention, the angle of the second conical section is between 30 ° and 70 °.

The utility model provides a roller, including stereoplasm plastic inner tube and the sponge layer that adopts above-mentioned mould molding.

According to some embodiments of the utility model, the sponge layer is the polyethylene sponge layer, the both ends on polyethylene sponge layer are equipped with respectively that length is 1 ~ 5mm, the angle is the interior chamfer of 30 ~ 70.

According to some embodiments of the invention, the porosity of the polyethylene sponge layer is 75-95%.

According to some embodiments of the invention, the polyethylene sponge layer has a pore size of 0.1-0.7 mm.

According to some embodiments of the utility model, the surface cloth of polyethylene sponge layer has the convex granule highly to be 0.2 ~ 0.5mm, clearance between the convex granule is 0.2 ~ 1.0 mm.

According to some embodiments of the utility model, the thickness of polyethylene sponge layer is 7 ~ 30mm, length is 180 ~ 300 mm.

The utility model provides a method for preparing cleaning roller, include:

providing a hard plastic inner pipe;

molding a polyethylene sponge layer on the outer surface of the hard plastic inner pipe, wherein two ends of the polyethylene sponge layer are respectively provided with an inner chamfer;

and polishing the polyethylene sponge layer.

The utility model provides a cleaning tool, including above-mentioned cylinder.

The utility model provides a polyethylene sponge layer both ends of cylinder for cleaning have interior chamfer, can be with the inside water route dynamic seal in polyethylene sponge layer, and the condition of infiltration can not take place for sewage in the better parcel sponge layer. Moreover, the convex particles on the surface of the cleaning agent reduce the friction force between the polyethylene sponge layer and the ground, and improve the cleaning capability. The polyethylene sponge layer of the utility model has high porosity, small pore size and very strong water absorption capacity.

The preparation method provided by the utility model is very simple, and the prepared roller has very superior performance.

The utility model provides a simple, the readily removable washing of mould structure, and the cylinder performance of preparing is very superior.

The utility model discloses utilize "water dirt circulation" clean technique can realize the automatically cleaning of cylinder, will sweep moreover, drag, wash, twist and combine together, very big convenient to use person, and can realize very good clean effect.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic longitudinal sectional view of a cleaning roller according to an embodiment of the present invention.

Fig. 2 is an exploded view of a mold according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of a bottom cover of the mold shown in fig. 2.

Fig. 4 is a schematic structural view of a cylinder of the mold shown in fig. 2, wherein (a) is a perspective view, (b) is a front view, and (c) is a left view.

Fig. 5 is a schematic structural view of a core cover of the mold shown in fig. 2, wherein (a) is a perspective view, (b) is a sectional view taken along a-a section, and (c) is a plan view.

Fig. 6 is a schematic structural view of a fixing plug of the mold shown in fig. 2, wherein (a) is a perspective view, (b) is a sectional view taken along a-a section, and (c) is a plan view.

Fig. 7 is a flowchart illustrating a process for manufacturing a drum according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a surface of the polyethylene sponge layer before and after polishing the roller according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of an internal structure of a polyethylene sponge layer according to an embodiment of the present invention.

Fig. 10 is a longitudinal sectional view of a cleaning tool according to an embodiment of the present invention.

Detailed Description

In the present disclosure, only certain exemplary embodiments have been described briefly. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The present disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described in the present invention. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

The utility model relates to a cleaning tool, which can be used for cleaning the ground, in particular to a smooth and flat small-area ground, such as a household and a kitchen ground. The utility model discloses burnisher is particularly suitable for the clean mixed rubbish that has dry rubbish, wet rubbish and such as the ropy such as noodless, congee, tomato ketchup.

The dry garbage of the utility model refers in particular to granular garbage, such as pericarp, melon seed shell, rice grain, scraps of paper, etc.

The wet garbage is liquid garbage, such as water, beverage, etc.

The viscous garbage (or viscous garbage) includes garbage with certain viscosity such as soup, thick soup, porridge, tomato sauce, chocolate sauce, etc.

Other rubbish is like dust, ground seal of a government organization in old china etc. also is the clean object of the utility model.

Fig. 1 shows a cleaning roller 1000 according to an embodiment of the present invention, which includes a hard plastic inner tube 1100 and a polyethylene sponge layer 1200. Wherein the polyethylene sponge layer 1200 is attached to the outer surface of the rigid plastic inner tube 1100. The polyethylene sponge layer 1200 is provided with inner chamfers 1210 at both ends thereof. Preferably, the length is 1-5 mm, and the angle is 30-70 degrees.

Fig. 2 to 6 show a mold 2000 for forming a roller sponge layer provided by the present invention. It includes bottom cap 2100, barrel 2200, axle center lid 2300 and fixed stopper 2400.

As shown in fig. 3, the bottom cover 2100 includes a first coupling portion 2110, a first chamfer forming portion 2120, a second coupling portion 2130, and a base 2140, which are connected in sequence. In this embodiment, the first connection portion 2110, the first chamfer forming portion 2120, the second connection portion 2130 and the base 2140 are all cylinders, and the diameters thereof are gradually increased.

The first connection portion 2110 is used to fix one end of the hard plastic inner tube 1100. The first connection portion 2110 is provided at one end with a guide portion 2111 to facilitate the insertion of the rigid plastic inner tube 1100 into the first connection portion 2110.

The first chamfer forming part 2120 is used for forming an inner chamfer 1210 at one end of the sponge layer 1200. The first chamfer forming portion 2120 includes a first straight section 2121 and a first tapered section 2122. The angle of the first tapered section 2122 directly determines the angle of the internal chamfer 1210 of the sponge layer 1200. As before, the angle of the first conical section 2122 is preferably between 30 ° and 70 °. The length of the first tapered section 2122 is equal to or greater than the length of the inner chamfer 1210. The length of the first straight line 2121 is not limited (but should not be too long), and it is convenient for the end of the demolded sponge layer 1200 to be cut and shaped at a later time.

The second connecting portion 2130 is used for fixing one end of the cylinder 2300, that is, the cylinder 2300 is sleeved on the second connecting portion 2130. In this embodiment, the second connecting portion 2130 is provided with two first sealing ring receiving grooves 2131 and 2132. The first sealing ring receiving grooves 2131 and 2132 are used for receiving sealing rings, and not only have a sealing function, but also enable the cylinder 2300 to be tightly fitted with the bottom cover 2100.

As shown in fig. 4, the cartridge 2200 includes a cartridge body 2210 and a first axial chamber 2220 extending through the cartridge body 2210. One end of the first axial cavity 2220 is detachably sleeved on the outer surface of the second connecting portion 2130.

As shown in fig. 5, the hub cover 2300 includes a hub cover body 2310 and a second axial chamber 2320 extending through the hub cover body 2310. The shaft center cover body 2310 includes a second chamfer forming part 2311 and a fixing groove 2312.

The second chamfer forming part 2311 is used to form the inner chamfer 1210 of the other end of the sponge layer 1200. Like the first chamfer molding 2120, the second chamfer molding 2311 includes a second straight section 2311a and a second tapered section 2131 b. As before, the angle of the second conical section 2131b is preferably 30 ° to 70 °. The length of the second conical section 2131b is equal to or greater than the length of the inner chamfer 1210. The length of the second straight line segment 2311a is not limited (but should not be too long), so that the end of the demolded sponge layer 1200 can be cut and shaped at a later time.

The fixing groove 2312 serves to fix the cylinder 2200, and the other end of the first axial chamber 2220 of the cylinder 2200 is detachably fixed in the fixing groove 2312. In this embodiment, the fixing groove 2312 is provided with first tangential edges 2312a and 2312b, wherein the first tangential edges 2312a and 2312b are symmetrical to each other. The first cut edges 2312a and 2312b are used for observing the molding condition and overflowing excessive polyethylene liquid during molding.

As shown in fig. 6, the fixed plug 2400 includes a fixed plug body 2410 and a third axial cavity 2420 extending through the fixed plug body 2410.

The fixing plug body 2410 includes a third connection part 2411 and a fourth connection part 2412. The third connecting portion 2411 is detachably disposed in the second axial chamber 2320. The fourth connection portion 2412 is used to fix the other end of the hard plastic inner tube 1210 of the sponge layer 1200. In this embodiment, the third connection portion 2411 is provided with a second sealing ring receiving groove 2411 a. The first packing receiving grooves 2131 and 2132 not only provide a sealing function, but also enable the fixing plug 2400 and the shaft cover 2300 to be tightly fitted together. In this embodiment, the fixing plug body 2410 is further provided with a second cut 2413, which is convenient for fixing the fixing plug 2400 and other devices together. In addition, the second cut 2413 can be used as an acting point during demolding, so that the second cut can be conveniently clamped and pulled out by a tool.

The third axial chamber 2420 includes a first chamber 2421 and a second chamber 2422 that communicate. Wherein the first chamber 2421 is provided with a vent gap 2421a and the second chamber 2422 has a diameter smaller than the first chamber 2421. At the fashioned in-process in polyethylene sponge layer, can produce a large amount of bubbles, the utility model discloses a mould 2000 is equipped with exhaust gap 2421a, and the bubble can be followed this exhaust gap 2421a and volatilized away, can not only improve the porosity on polyethylene sponge layer, enables its inside hole more even moreover, is favorable to improving the water-absorbing capacity on sponge layer. The third axial cavity 2420 is used to secure the fixation plug 2400 with other devices.

The utility model discloses in, bottom 2100, barrel 2200, axle center lid 2300 and fixed stopper 2400 can dismantle the connection, make things convenient for the drawing of patterns, also convenient the washing.

In operation, the inner tube 1100 of the rigid plastic of the bottom cap 2100 is inserted into the bottom cap 2100, the barrel 2200, the axial cap 2300 and the fixing plug 2400 are then coupled together as shown in fig. 2, a polyethylene fluid is then added into the barrel 2200 from the third axial cavity 2420, and the fixing plug 2400 is finally fixed to a device. Excess polyethylene liquid can spill over the first cut edges 2312a and 2312 b. After molding, the bottom cover 2100, the cylinder 2200, the shaft cover 2300 and the fixing plug 2400 are respectively disassembled. The utility model provides a mould simple structure, easy unpicking and washing.

Fig. 7 shows a method for manufacturing a drum according to an embodiment of the present invention, which includes the following steps:

s701: preparing a hard plastic inner tube.

The hard plastic inner pipe can be made by self or purchased and can be selected according to the requirement.

S702: and molding a polyethylene sponge layer on the surface of the hard plastic inner pipe.

Preferably, the polyethylene sponge layer is molded on the surface of the hard plastic inner pipe by using the grinding tool. The specific process is not described in detail.

S702: and polishing the polyethylene sponge layer.

After the product demolding, the surface can form the membrane skin of one deck thickness 0.2 ~ 0.5mm, and this membrane skin has increased the area of contact with ground, and then under the unit pressure such as, makes the frictional force grow, exceeds the required frictional force of normally mopping the dirty ground clean, and then has increased the burden of user and machine itself in the cleaning process. Further, the membrane has strong tension and thickness, so that the inner sponge layer is extruded in a closed space, and the elasticity of part of the bound material is reduced, thereby reducing the cleaning effect.

The utility model discloses after the polyethylene sponge layer demolding, polish it. After polishing, the epidermis is partially worn out to expose the inner layer, and finally convex particles are distributed on the outer surface of the polyethylene sponge layer (as shown in figure 8). Preferably, the entire outer surface is covered with the convex particles. At this time, the contact area is reduced, the friction coefficient is reduced, and the internal elasticity is released. Preferably, the height of the convex particles is 0.2-0.5 mm, and the gaps between the convex particles are 0.2-1.0 mm.

The utility model discloses a preparation method is direct at the surface shaping polyethylene sponge layer of stereoplasm plastic inner tube, has avoided prior art's bonding process, and the condition that the bonding part is hardened not only can not appear, has avoided sponge layer and inside stereoplasm plastic inner tube to appear eccentric condition moreover. Further, after demolding, only partial finishing (at most, only the part formed by cutting the gap between the first straight line segment 2121, the second straight line segment 2311a and the barrel 2200) needs to be performed on the polyethylene sponge layer, and excessive cutting does not occur.

The utility model discloses the polyethylene sponge layer that makes is porous sponge layer (as shown in fig. 9), and its porosity can reach 75 ~ 95%. Preferably, the size of the pores of the polyethylene sponge layer is 0.1-0.7 mm. The utility model discloses the polyethylene sponge layer that makes absorbs water and lock the water effect very good. And because the existence of the interior chamfer at the both ends on polyethylene sponge layer, can be with the inside water route dynamic seal in polyethylene sponge layer, the sewage in the better parcel sponge layer can not take place the condition of infiltration. Preferably, the thickness of the polyethylene sponge layer is 7-30 mm, and the length of the polyethylene sponge layer is 180-300 mm.

Further, the present invention provides a cleaning tool comprising the aforementioned roller.

Fig. 10 shows a cleaning tool including the drum according to an embodiment of the present invention, which includes a drum 1000, a housing 3000, a trash can 4000, a clean water tank (not shown), and a sewage tank 5000.

The shell 3000 is provided with a shovel strip 3100 and a water sealing member 3200, wherein the shovel strip 3100 is provided with an arc-shaped working surface, one end of the shovel strip is in contact with the ground during working, and the other end of the shovel strip is connected with the dustbin 4000. A garbage passage is formed between the arc-shaped working surface and the outer circumferential surface of the drum 1000, and garbage cleaned by the drum 1000 enters the garbage bin 4000 through the garbage passage.

In addition, a first water pressurizing plate 3300 and a second water pressurizing plate 3400 are provided on the housing 3000. The water seal 3200, the first water pressure plate 3300, and the second water pressure plate 3400 respectively interfere with (i.e., press) the drum 1000. The water sealing member 3200, the first water pressing plate 3300, and the drum 1000 together form a first water tank a, and the first water pressing plate 3300, the second water pressing plate 3400, and the drum 1000 together form a second water tank B.

Above the sink, the housing 3000 is provided with a sink upper cover 3500, which is conveniently used for cleaning the sink. The upper cover 3500 of the water tank is further provided with a clear water inlet 3510, and the clear water inlet 3510 is connected with a clear water tank (not shown in the figure). In this embodiment, the clean water inlet 3510 is located above the second tub B, and clean water enters the second tub B from the clean water inlet 3510, thereby washing the drum 1000. In other embodiments of the present invention, the clean water inlet 3510 may be disposed above the first water tank a, and of course, may be disposed above the first water tank a and the second water tank B at the same time.

The housing 3000 further includes a first water outlet (not shown) and a second water outlet (not shown) corresponding to the first water tank a and the second water tank B. The first and second water tank outlets are connected to the sewage tank 5000. Alternatively, the side wall of the housing 3000 is provided with an inclined sewage passage (not shown in the drawings), and the sewage in the first and second sinks flows from the sewage passage into the sewage tank 5000 by its own weight. The sewage channel can be provided with a sewage channel upper cover, so that a user can clean the sewage channel conveniently.

The drum 1000 is greatly interfered at the first water pressurizing plate 3300, and the contaminated water in the drum 1000 is squeezed out. The roller 1000 rotates continuously, clear water is sprayed out from the clear water inlet 3510 to clean the roller 1000, the roller 1000 rotates to the position of the second water pressing plate 3400 and is interfered again greatly to clean the roller 1000 for the second time, and sewage in the first water tank A and the second water tank B flows into the sewage tank 5000. Through the arrangement of two stages of water tanks and two times of extrusion, the roller can be cleaned very cleanly in the process of supporting and sweeping, and the roller does not need to be cleaned frequently by adopting a special cleaning program.

It should be noted that the cleaning tool provided by the present invention is not limited to the structure of the above embodiments, as long as the cleaning tool includes the roller provided by the present invention, and can clean.

Because the polyethylene sponge layer both ends of cylinder have interior chamfer, can be with the inside water route dynamic seal in polyethylene sponge layer, the sewage in the better parcel sponge layer can not take place the condition of infiltration. Moreover, the convex particles on the surface of the cleaning agent reduce the friction force between the polyethylene sponge layer and the ground, and improve the cleaning capability. The polyethylene sponge layer of the utility model has high porosity, small pore size and very strong water absorption capacity. Therefore, the utility model provides a cleaning tool can clean the rubbish of various forms, especially very good to the clean effect of gluing thick rubbish.

It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims (10)

1. A fashioned mould of sponge layer for cylinder, the cylinder include stereoplasm plastic inner tube with the sponge layer, its characterized in that, the mould includes:

the bottom cover comprises a first connecting part, a first chamfer forming part, a second connecting part and a base which are sequentially connected, wherein the first connecting part is used for fixing one end of the hard plastic inner pipe;

the cylinder body comprises a cylinder body and a first axial cavity penetrating through the cylinder body, and one end of the first axial cavity is detachably sleeved outside the second connecting part;

the shaft center cover comprises a shaft center cover body and a second axial cavity penetrating through the shaft center cover body, the shaft center cover body comprises a second chamfer forming part and a fixing groove, and the other end of the first axial cavity is detachably fixed in the fixing groove;

the fixing plug comprises a fixing plug body, the fixing plug body comprises a third connecting portion and a fourth connecting portion, the third connecting portion is detachably sleeved in the second axial cavity, and the fourth connecting portion is used for fixing the other end of the hard plastic inner tube.

2. The mold of claim 1, wherein the fixed plug further comprises a third axial cavity extending through the fixed plug body.

3. The mold of claim 2, wherein the third axial cavity comprises first and second cavities in communication, the first cavity being provided with a vent gap.

4. The die of claim 3, wherein the diameter of the second cavity is smaller than the diameter of the first cavity.

5. The mold according to claim 1, wherein one end of the first connecting portion is provided with a guide section.

6. The mold of claim 1, wherein the second connecting portion is provided with a first seal receiving groove.

7. The mold of claim 1, wherein the retaining groove is provided with a first cut edge.

8. The mold of claim 1, wherein the third connecting portion is provided with a second seal receiving groove.

9. The mold of claim 1, wherein the fixed plug body is provided with a second cutting edge.

10. A roller comprising a rigid plastic inner tube and a foam layer molded using the mold of any one of claims 1-9.

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