Ventilation column assembly and seat foaming mold with same

Abstract

The utility model discloses a ventilation column assembly and a seat foaming mold with the ventilation column assembly. A ventilation column assembly belongs to the technical field of seat foaming molds and comprises an upper mold ventilation column and a lower mold ventilation column, the upper mold ventilation column is suitable for being mounted in an upper mold of the seat foaming mold, the axis of the upper mold ventilation column extends in the vertical direction, and the diameter of the upper mold ventilation column is gradually decreased from top to bottom; the risk that a foaming body of a seat interferes with the upper mold ventilation column during demolding is reduced, the lower mold ventilation column is suitable for being installed in a lower mold of the seat foaming mold, the axis of the lower mold ventilation column and the axis of the upper mold ventilation column are collinear, and the diameter of the lower mold ventilation column is gradually increased from top to bottom; the risk that the foaming body of the seat interferes with the lower mold ventilation column during demolding is reduced, so that the foaming body is smoothly demolded, and the production efficiency and the production quality of the foaming body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seat foaming moulds, in particular to a ventilation column component and a seat foaming mould having the same. Background Art

[0002] The seats with ventilation function in vehicles usually include a frame, a foam body and a seat cover. The frame is connected to the vehicle body, and the foam body is connected between the frame and the seat cover. The seat cover can be made of perforated leather. The foam body is provided with ventilation holes. A fan can be provided on the side of the foam body facing away from the occupant. The fan inhales or blows out air into the ventilation holes to form a ventilation airflow on the seat cover, which is beneficial to improving the comfort of the occupants.

[0003] In the related art, the foaming mold for making the foam body of the seat has an upper mold and a lower mold. The foaming mold also has a ventilation column for forming the ventilation holes of the foam body. The ventilation column is an inverted cone shape with a diameter gradually increasing from bottom to top. If the ventilation column is set on the upper mold, when the foaming mold is opened, the lower mold descends. After the lower mold descends to a preset position, the upper mold rotates to open the foaming mold. The distance the lower mold descends is usually less than the length of the ventilation column. At this time, a part of the ventilation column is still located in the foam body. The upper mold rotates to separate the mold, causing the ventilation column to interfere with the foam body, and the foam body is at risk of being torn by the ventilation column. If the ventilation column is set on the lower mold, when the foam body is taken out from the lower mold upward, the inverted cone-shaped ventilation column will interfere with the foam body, which is not conducive to demolding the foam body, and the production efficiency and production quality of the foam body are poor. Utility Model Content

[0004] The utility model aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the utility model proposes a ventilation column assembly for a seat foaming mold, which is conducive to reducing the risk of interference between the foam body and the ventilation column assembly.

[0005] The utility model also provides a seat foaming mold with the ventilation column assembly.

[0006] According to the ventilation column assembly for a seat foaming mold according to an embodiment of the utility model, the ventilation column assembly includes: an upper mold ventilation column and a lower mold ventilation column, the upper mold ventilation column is suitable for being installed in the upper mold of the seat foaming mold, the axis of the upper mold ventilation column extends in the up and down directions, and the diameter of the upper mold ventilation column gradually decreases from top to bottom; the lower mold ventilation column is suitable for being installed in the lower mold of the seat foaming mold, the axis of the lower mold ventilation column is colinear with the axis of the upper mold ventilation column, and the diameter of the lower mold ventilation column gradually increases from top to bottom.

[0007] According to the ventilation column assembly for the seat foaming mold according to the embodiment of the utility model, the diameter of the upper mold ventilation column gradually decreases from top to bottom, and the diameter of the lower mold ventilation column gradually increases from top to bottom, which is beneficial to reduce the risk of interference between the foam body of the seat and the upper mold ventilation column and the lower mold ventilation column during demolding, so as to facilitate smooth demolding of the foam body, which is beneficial to improving the production efficiency and production quality of the foam body.

[0008] According to some embodiments of the utility model, when the seat foaming mold is closed, the bottom surface of the upper mold ventilation column and the top surface of the lower mold ventilation column are opposite to and abut against each other.

[0009] According to some embodiments of the utility model, a sealing member is provided on the bottom surface of the upper mold ventilation column and / or the top surface of the lower mold ventilation column.

[0010] According to some embodiments of the present invention, the bottom diameter of the upper mold ventilation column is the same as the top diameter of the lower mold ventilation column.

[0011] According to some embodiments of the present invention, the top surface diameter of the upper mold ventilation column is larger than the bottom surface diameter of the lower mold ventilation column.

[0012] According to some embodiments of the utility model, the bottom diameter of the lower mold ventilation column is D1, satisfying the relationship, 18mm≤D1≤22mm; the top diameter of the lower mold ventilation column is D2, satisfying the relationship, 14mm≤D2≤18mm; the bottom diameter of the upper mold ventilation column is D3, satisfying the relationship, 14mm≤D3≤18mm; the top diameter of the upper mold ventilation column is D4, satisfying the relationship, 25mm≤D4≤30mm.

[0013] According to some embodiments of the present invention, in the up-down direction, the height of the lower mold ventilation column is smaller than the height of the upper mold ventilation column.

[0014] According to some embodiments of the utility model, the height of the lower mold ventilation column is H1, which satisfies the relationship: 10mm≤H1≤20mm.

[0015] According to another aspect of the present invention, a seat foaming mold comprises an upper mold, a lower mold and a ventilation column assembly, wherein the ventilation column assembly is the above-mentioned ventilation column assembly for the seat foaming mold.

[0016] According to the seat foaming mold of the embodiment of the utility model, the diameter of the upper mold ventilation column gradually decreases from top to bottom, and the diameter of the lower mold ventilation column gradually increases from top to bottom, which is beneficial to reduce the risk of interference between the foam body of the seat and the upper mold ventilation column and the lower mold ventilation column during demolding, so as to facilitate smooth demolding of the foam body, which is beneficial to improving the production efficiency and production quality of the foam body.

[0017] According to some embodiments of the present invention, there are multiple ventilation column assemblies.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of an upper mold, a ventilation column assembly and a foam body according to an embodiment of the utility model;

[0020] Figure 2 Schematic diagram of a seat according to an embodiment of the utility model.

[0021] Reference numerals:

[0022] Upper mold ventilation column 1; lower mold ventilation column 2; ventilation column assembly 10; upper mold 20; seat 100; foam body 1001; ventilation hole 10011; A surface 10012; B surface 10013; frame 1002; seat cover 1003. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Combine the following Figure 1-Figure 2 The ventilation column assembly 10 and the seat foaming mold having the same according to the embodiment of the present utility model are described in detail.

[0028] Reference Figure 1 and Figure 2 As shown, according to the ventilation column assembly 10 for a seat foaming mold according to an embodiment of the utility model, the ventilation column assembly 10 includes: an upper mold ventilation column 1 and a lower mold ventilation column 2, the upper mold ventilation column 1 is suitable for being installed in the upper mold 20 of the seat foaming mold, the axis of the upper mold ventilation column 1 extends in the up and down directions, and the diameter of the upper mold ventilation column 1 gradually decreases from top to bottom, the lower mold ventilation column 2 is suitable for being installed in the lower mold of the seat foaming mold, the axis of the lower mold ventilation column 2 is colinear with the axis of the upper mold ventilation column 1, and the diameter of the lower mold ventilation column 2 gradually increases from top to bottom, which is beneficial to reduce the risk of interference between the foam body 1001 of the seat 100 and the upper mold ventilation column 1 and the lower mold ventilation column 2 during demolding, so as to facilitate smooth demolding of the foam body 1001.

[0029] It can be understood that before the foam body 1001 of the seat 100 is made, the upper mold 20 and the lower mold of the seat foaming mold are spaced apart in the up and down directions. When the foam body 1001 of the seat 100 is made, the lower mold rises and closes with the upper mold 20, and the lower mold and the upper mold 20 jointly define a mold cavity. The upper mold ventilation column 1 and the lower mold ventilation column 2 are relatively arranged in the mold cavity, and the mold cavity is filled with foaming material to foam the foam body 1001. The foam body 1001 is spaced apart from the upper mold ventilation column 1 and At least part of the ventilation hole 10011 is formed at the position corresponding to the ventilation column 2 of the lower mold. Then, the lower mold descends, the upper mold 20 is fixed, and the foam 1001 descends together with the lower mold under the action of its own gravity to separate the foam 1001 from the upper mold 20. When the lower mold descends to the preset position, the upper mold 20 rotates to facilitate the removal of the foam 1001 from the lower mold. The operator or equipment can take the foam 1001 out of the lower mold upwards to complete the production of the foam 1001.

[0030] The diameter of the upper mold ventilation column 1 gradually decreases from top to bottom, and the diameter of the lower mold ventilation column 2 gradually increases from top to bottom. During the demolding process of the foam 1001, when the foam 1001 descends together with the lower mold, the foam 1001 moves in the direction of the decreasing diameter of the upper mold ventilation column 1 to avoid interference between the foam 1001 and the upper mold ventilation column 1 during separation. The length of the upper mold ventilation column 1 extending into the foam 1001 gradually shortens. When the upper mold 20 rotates, the risk of the upper mold ventilation column 1 tearing the foam 1001 can be effectively reduced. When the foam 1001 is taken out from the lower mold upward, the foam 1001 moves in the direction of the decreasing diameter of the lower mold ventilation column 2 to avoid interference between the foam 1001 and the lower mold ventilation column 2 during separation, which facilitates the demolding of the foam 1001 and avoids tearing of the foam 1001 during the demolding process, which is beneficial to improving the qualified rate of the foam 1001, thereby helping to improve the production efficiency and production quality of the production line.

[0031] The seat foaming mold can be used to make the foam body 1001 on the seat cushion and backrest of the seat 100, the ventilation column assembly 10 of the seat foaming mold is used to form the ventilation holes 10011 of the foam body 1001, the A surface 10012 of the foam body 1001 is formed in the lower mold of the seat foaming mold, and the B surface 10013 of the foam body 1001 is formed in the upper mold 20 of the seat foaming mold, the A surface 10012 is the surface of the foam body 1001 close to the occupant, and the B surface 10013 is the surface of the foam body 1001 away from the occupant. The seat 100 may also include a frame 1002 and a seat cover 1003. The frame 100 2 is connected to the vehicle body, the B surface 10013 of the foam body 1001 can be fixedly connected to the frame 1002, the A surface 10012 of the foam body 1001 can be fixedly connected to the seat cover 1003, the seat cover 1003 can be made of perforated leather, and the B surface 10013 of the foam body 1001 can be provided with a fan, and the fan sucks or blows air to the ventilation hole 10011, so that the ventilation hole 10011, the seat cover 1003 and the outside of the seat cover 1003 form a ventilation airflow to disperse the sweat on the buttocks and back of the occupant, realize the ventilation function of the seat 100, and thus help to improve the comfort of the occupant. In addition, the seat 100 may also include a heating pad, which is connected between the seat cover 1003 and the A surface 10012 of the foam body 1001, and the heating pad can be used to realize the heating function of the seat.

[0032] In the direction from the B surface 10013 to the A surface 10012, the diameter of the ventilation hole 10011 formed by the ventilation column assembly 10 first gradually decreases and then gradually increases. That is to say, the ventilation hole 10011 is constructed as a Laval nozzle structure with large diameters at both ends and a small diameter in the middle, so as to increase the flow rate of the airflow flowing through the ventilation hole 10011, which is beneficial to improving the ventilation capacity of the ventilation hole 10011, and can effectively improve the heat dissipation capacity of the seat, which is beneficial to further improve the comfort of the occupants.

[0033] According to the ventilation column assembly 10 for the seat foaming mold according to the embodiment of the utility model, the diameter of the upper mold ventilation column 1 gradually decreases from top to bottom, and the diameter of the lower mold ventilation column 2 gradually increases from top to bottom, which is beneficial to reduce the risk of interference between the foam body 1001 of the seat 100 and the upper mold ventilation column 1 and the lower mold ventilation column 2 during demolding, so as to facilitate smooth demolding of the foam body 1001, which is beneficial to improving the production efficiency and production quality of the foam body 1001.

[0034] In some embodiments of the present invention, referring to Figure 1 As shown, when the seat foaming mold is closed, the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 are opposite to each other and abut against each other. When the foam body 1001 is produced, the risk of the foaming material entering between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 during foaming can be reduced to prevent the foaming material from clogging the ventilation hole 10011. That is to say, when the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 are opposite to each other and abut against each other, the foam body 1001 can form a through ventilation hole 10011 structure at the upper mold ventilation column 1 and the lower mold ventilation column 2, and there is no need to add a process of opening the ventilation hole 10011, which is beneficial to the one-time molding of the foam body 1001, thereby helping to improve the production efficiency of the foam body 1001.

[0035] In some embodiments of the utility model, a seal is provided on the bottom surface of the upper mold ventilation column 1 and / or the top surface of the lower mold ventilation column 2, and the seal is suitable for filling the gap between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, thereby facilitating further reducing the risk of the foaming material entering between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, preventing the foaming material from clogging the ventilation hole 10011, and eliminating the need to add a process for opening the ventilation hole 10011, which is facilitating the one-time molding of the foam body 1001 and thereby facilitating improving the production efficiency of the production line.

[0036] Among them, the seal can be a high-temperature resistant plastic sheet, and the material of the seal can be polytetrafluoroethylene, polyetheretherketone and other materials. After the seat foaming mold is closed, the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 can jointly clamp the seal and make the seal elastically deform. The seal can fully fill the gap between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2. At the same time, the seal can avoid direct contact between the upper mold ventilation column 1 and the lower mold ventilation column 2, which is beneficial to reduce the wear between the bottom surface of the upper mold ventilation column 1 and the lower mold ventilation column 2, and improve the service life of the ventilation column assembly 10. In addition, the seal is cheap and can be replaced after damage. The maintenance cost of the seat foaming mold is low.

[0037] In some embodiments, a seal is provided on the bottom surface of the upper mold ventilation column 1, and the seal is suitable for filling the gap between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, thereby facilitating further reducing the risk of foaming material entering between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 to prevent the foaming material from clogging the ventilation hole 10011.

[0038] In other embodiments, a seal is provided on the top surface of the lower mold ventilation column 2, and the seal is suitable for filling the gap between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, thereby facilitating further reducing the risk of the foaming material entering between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, so as to prevent the foaming material from clogging the ventilation hole 10011.

[0039] In some other embodiments, the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2 are provided with seals, and the seals fill the gap between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, thereby helping to further reduce the risk of foaming material entering between the bottom surface of the upper mold ventilation column 1 and the top surface of the lower mold ventilation column 2, so as to prevent the foaming material from clogging the ventilation hole 10011.

[0040] In some embodiments of the utility model, the bottom diameter of the upper mold ventilation column 1 and the top diameter of the lower mold ventilation column 2 are the same to ensure that the inner wall of the ventilation hole 10011 is smooth and continuous. There is no need to add a process for cleaning the ventilation hole 10011, which is beneficial to the one-time molding of the foam 1001, thereby helping to improve the production efficiency of the foam 1001.

[0041] In some embodiments of the present invention, the top surface diameter of the upper mold ventilation column 1 is larger than the bottom surface diameter of the lower mold ventilation column 2, so that after the ventilation hole 10011 of the foam 1001 is formed, the diameter of the ventilation hole 10011 on the B surface 10013 of the foam 1001 is larger than the diameter of the ventilation hole 10011 on the A surface 10012 of the foam 1001.

[0042] It can be understood that the diameter of the ventilation hole 10011 on the B side 10013 of the foam body 1001 is larger to increase the flow area at the joint between the ventilation hole 10011 and the fan, which is beneficial to increase the ventilation volume of the ventilation hole 10011 and improve the ventilation effect of the ventilation hole 10011. The diameter of the ventilation hole 10011 on the A side 10012 of the foam body 1001 is smaller to ensure the structural strength of the foam body 1001, which is beneficial to ensure the supporting performance of the seat 100, and help the seat 100 to reliably support the occupants sitting on the seat 100, thereby improving the comfort of the occupants.

[0043] In some embodiments of the utility model, the bottom diameter of the lower mold ventilation column 2 is D1, which satisfies the relationship 18mm≤D1≤22mm, the top diameter of the lower mold ventilation column 2 is D2, which satisfies the relationship 14mm≤D2≤18mm, the bottom diameter of the upper mold ventilation column 1 is D3, which satisfies the relationship 14mm≤D3≤18mm, and the top diameter of the upper mold ventilation column 1 is D4, which satisfies the relationship 25mm≤D4≤30mm. For example, when D1 is 18mm, D2 can be 14mm, D3 can be 14mm, and D4 can be 25mm. For another example, when D1 is 20mm, D2 can be 16mm, D3 can be 16mm, and D4 can be 28mm. For another example, when D1 is 22mm, D2 can be 18m, D3 can be 18mm, and D4 can be 30mm.

[0044] It can be understood that the top surface diameter of the upper mold ventilation column 1 and the bottom surface diameter of the lower mold ventilation column 2 are larger, and the top surface diameter of the lower mold ventilation column 2 and the bottom surface diameter of the upper mold ventilation column 1 are smaller, so that the ventilation hole 10011 is formed into a Laval nozzle structure with large diameters at both ends and a small diameter in the middle, which is beneficial to increase the flow rate of the airflow flowing through the ventilation hole 10011, thereby helping to improve the ventilation effect of the ventilation hole 10011. The top surface diameter of the upper mold ventilation column 1 is larger than the bottom surface diameter of the lower mold ventilation column 2, so that the diameter of the ventilation hole 10011 on the B surface 10013 of the foam 1001 is larger than the diameter of the ventilation hole 10011 on the A surface 10012 of the foam 1001, thereby ensuring the supporting performance of the seat 100, and increasing the flow area of ​​the ventilation hole 10011 to improve the ventilation capacity of the ventilation hole 10011.

[0045] In some embodiments of the utility model, in the up and down directions, the height of the lower mold ventilation column 2 is smaller than the height of the upper mold ventilation column 1. When the foam 1001 is demolded, when the operator or equipment takes the foam 1001 upward from the lower mold and separates it from the lower mold ventilation column 2, the height of the lower mold ventilation column 2 is lower, and the foam 1001 can be separated from the lower mold ventilation column 2 by taking it upward to a smaller height, so that the foam 1001 can be taken out from the lower mold easily.

[0046] In some embodiments of the utility model, the height of the lower mold ventilation column 2 is H1, satisfying the relationship: 10mm≤H1≤20mm. For example, H1 can be 10mm, 15mm, 20mm, etc. When the foam 1001 is demolded, when the operator or equipment takes the foam 1001 upward from the lower mold and separates it from the lower mold ventilation column 2, the height of the lower mold ventilation column 2 is relatively low, and the foam 1001 can be separated from the lower mold ventilation column 2 by taking out a smaller height upward, so that the foam 1001 can be taken out from the lower mold easily.

[0047] According to another embodiment of the present invention, a seat foaming mold includes an upper mold 20, a lower mold and a ventilation column assembly 10. The ventilation column assembly 10 is the above-mentioned ventilation column assembly 10 for the seat foaming mold.

[0048] According to the seat foaming mold of the embodiment of the utility model, the diameter of the upper mold ventilation column 1 gradually decreases from top to bottom, and the diameter of the lower mold ventilation column 2 gradually increases from top to bottom, which is beneficial to reduce the risk of interference between the foam body 1001 of the seat 100 and the upper mold ventilation column 1 and the lower mold ventilation column 2 during demolding, so as to facilitate smooth demolding of the foam body 1001, which is beneficial to improving the production efficiency and production quality of the foam body 1001.

[0049] In some embodiments of the utility model, there are multiple ventilation column assemblies 10. When the foam body 1001 is manufactured, the multiple ventilation column assemblies 10 can form the foam body 1001 with multiple ventilation holes 10011. The multiple ventilation holes 10011 can together constitute a ventilation layer of the foam body 1001. The air flow can flow toward the occupants through the multiple ventilation holes 10011, which can effectively disperse the sweat on the occupants' buttocks and backs, thereby helping to enhance the occupants' comfort.

[0050] The seat foaming mold according to the embodiment of the utility model has a simple structure, is easy to operate and process, and the diameter of the upper mold ventilation column 1 gradually decreases from top to bottom, while the diameter of the lower mold ventilation column 2 gradually increases from top to bottom, which can effectively solve the tearing problem of the foam body 1001 during demolding, and is beneficial to improving the one-time mold opening pass rate of the seat foaming mold.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0052] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A ventilation column assembly for a seat foaming mold, characterized in that: The ventilation column assembly comprises: An upper mold ventilation column (1), the upper mold ventilation column (1) being suitable for being installed in the upper mold (20) of the seat foaming mold, the axis of the upper mold ventilation column (1) extending in the up-down direction, and the diameter of the upper mold ventilation column (1) gradually decreasing from top to bottom; A lower mold ventilation column (2), wherein the lower mold ventilation column (2) is suitable for being installed in the lower mold of the seat foaming mold, the axis of the lower mold ventilation column (2) is colinear with the axis of the upper mold ventilation column (1), and the diameter of the lower mold ventilation column (2) gradually increases from top to bottom.

2. The ventilation column assembly for a seat foaming mold according to claim 1, characterized in that: When the seat foaming mold is closed, the bottom surface of the upper mold ventilation column (1) and the top surface of the lower mold ventilation column (2) are opposite to and abut against each other.

3. The ventilation column assembly for a seat foaming mold according to claim 2, characterized in that: The bottom surface of the upper mold ventilation column (1) and / or the top surface of the lower mold ventilation column (2) are provided with sealing members.

4. The ventilation column assembly for a seat foaming mold according to claim 2, characterized in that: The bottom diameter of the upper mold ventilation column (1) is the same as the top diameter of the lower mold ventilation column (2).

5. The ventilation column assembly for a seat foaming mold according to claim 4, characterized in that: The top surface diameter of the upper mold ventilation column (1) is greater than the bottom surface diameter of the lower mold ventilation column (2).

6. The ventilation column assembly for a seat foaming mold according to claim 5, characterized in that: The bottom diameter of the lower mold ventilation column (2) is D1, which satisfies the relationship: 18mm≤D1≤22mm; The top surface diameter of the lower mold ventilation column (2) is D2, which satisfies the relationship 14mm≤D2≤18mm; The bottom diameter of the upper mold ventilation column (1) is D3, which satisfies the relationship: 14 mm ≤ D3 ≤ 18 mm; The top surface diameter of the upper mold ventilation column (1) is D4, which satisfies the relationship: 25mm≤D4≤30mm.

7. The ventilation column assembly for a seat foaming mold according to any one of claims 1 to 6, characterized in that: In the up-down direction, the height of the lower mold ventilation column (2) is smaller than the height of the upper mold ventilation column (1).

8. The ventilation column assembly for a seat foaming mold according to claim 7, characterized in that: The height of the lower mold ventilation column (2) is H1, which satisfies the relationship: 10mm≤H1≤20mm.

9. A seat foaming mold, characterized in that: include: An upper mold (20), a lower mold and a ventilation column assembly, wherein the ventilation column assembly is a ventilation column assembly for a seat foaming mold according to any one of claims 1-8.

10. The seat foaming mold according to claim 9, characterized in that: The number of the ventilation column assemblies is multiple.

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