Exhaust cylinder for PUR foaming mold
By designing exhaust cylinders for PUR foaming molds, the problem of low efficiency of traditional exhaust methods is solved, and more efficient and reliable gas discharge is achieved, improving the quality of foamed products and reducing production costs.
Patent Information
- Application Number
- CN202421247776.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-03
AI Technical Summary
Traditional PUR foaming molds are inefficient during the exhaust process, making it difficult to ensure the continuity and uniformity of the exhaust, resulting in defects in foamed products.
An exhaust cylinder for PUR foaming mold is designed, including a cylinder block, a cylinder liner and a cylinder head rod, and an air inlet, an air inlet, an air inlet and an air inlet and exhaust port are provided. The opening and closing of the air outlet is controlled through a valve to ensure that the air in the cylinder can be effectively discharged.
Through the use of this exhaust cylinder, the quality of foamed products can be significantly improved, ensuring that the back appearance of the product meets the mass production quality needs, reducing labor investment and reducing production costs.
Smart Images
Figure CN222662429U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PUR foaming moulds, in particular to an exhaust cylinder used on a PUR foaming mould. Background Art
[0002] PUR (polyurethane) foam products have good sound absorption and resilience, and are widely used in automotive parts, such as engine hood sound insulation pads, fender sound insulation pads, etc., which play a role in noise reduction and improve the comfort of car riding. PUR foam molding is a common process. The PUR foam molding process requires that two or more liquid components be mixed in a mixing head and then quickly injected into a closed mold. A chemical reaction occurs inside the mold to generate polyurethane and form foam at the same time. The PUR foam mold includes an upper mold and a lower mold. Generally, the lower mold is the front of the cotton-composite product, and the upper mold is the back of the cotton-composite product.
[0003] During the manufacturing process of PUR foam products, the foam products are foamed and molded in a closed mold. The raw materials increase in volume during the foaming process and fill the mold. If there are many small concave features on the upper mold cavity surface, part of the air will be trapped in these small concave features during the process of the foaming material filling the mold cavity from bottom to top, so that there is no foaming material filling the concave features, and the foaming material will be missing at the highest point of these small convex features of the product, resulting in defective products. In this process, in order to ensure the quality of the molded product, the gas discharge in the mold cavity must be controlled to avoid defects caused by the gas being enclosed inside the mold.
[0004] Traditional PUR foaming molds usually use natural exhaust or simple manual exhaust methods, which are often inefficient and difficult to ensure the continuity and uniformity of exhaust. With the improvement of production efficiency and product quality requirements, a more efficient and reliable exhaust device is needed to meet the needs of modern PUR foaming molds. Utility Model Content
[0005] The utility model aims to provide an exhaust cylinder for a PUR foaming mould, so as to solve the problem that the gas in the PUR foaming mould cannot be exhausted, resulting in defects in the PUR foaming product.
[0006] The utility model provides an exhaust cylinder used for a PUR foaming mold, comprising a cylinder body, a cylinder sleeve and a cylinder ejector rod.
[0007] The cylinder body is provided with an exhaust port and an inlet and exhaust port, and the position of the inlet and exhaust port is higher than the position of the exhaust port;
[0008] The cylinder liner is fixedly mounted on the bottom of the cylinder body, the inner cavity of the cylinder liner is communicated with the inner cavity of the cylinder body, an air inlet is provided on the cylinder liner, the position of the air inlet is lower than the position of the exhaust port, and the cylinder liner is mounted on a PUR foaming mold;
[0009] The cylinder push rod is arranged in a communicating cavity formed by the cylinder sleeve and the cylinder body, and a piston is arranged at the end of the cylinder push rod.
[0010] In some embodiments of the present application, the air inlet, the exhaust port, and the inlet and exhaust ports are all provided with valves, and the valves are used to control the opening and closing of the air inlet, the exhaust port, and the inlet and exhaust ports.
[0011] In some embodiments of the present application, a gap of 0.1 mm is provided between the cylinder liner and the cylinder top rod, and the air in the PUR foaming mold is discharged through the gap.
[0012] In some embodiments of the present application, a limiting member is provided at the bottom of the cylinder liner, and the limiting member is used to limit the cylinder top rod on the central axis inside the cylinder liner.
[0013] In some embodiments of the present application, the piston is disposed in the cylinder body.
[0014] In some embodiments of the present application, the valves of the air inlet and outlet and the air outlet are in a normally open state;
[0015] When the exhaust cylinder is exhausting, the valve of the air inlet is in a closed state;
[0016] When the exhaust cylinder stops exhausting and resetting, the valve of the air inlet is in an open state.
[0017] In some embodiments of the present application, an external thread is provided at the bottom of the cylinder liner, and the cylinder liner is connected to the PUR foaming mold through the external thread.
[0018] In some embodiments of the present application, the cylinder body and the cylinder liner are sealedly connected.
[0019] In some embodiments of the present application, the air inlet is connected to an external air source.
[0020] Compared with the prior art, the beneficial effects of the utility model are: by setting the air inlet, the exhaust port and the air inlet and exhaust port, the exhaust of the cylinder can be guaranteed, and the foaming material entering the cylinder can be discharged; and a cylinder sleeve is provided to be connected with the PUR foaming mold, so as to facilitate the discharge of the air in the PUR foaming mold; by using this new cylinder, the appearance of the back of the foamed product can be significantly improved compared with the original, and it is more in line with the quality requirements of mass production; this structure can be adapted to the production equipment to realize automation, reduce labor input, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0022] Figure 1 It is a schematic diagram of the structure of the exhaust cylinder used on the PUR foaming mold in the embodiment of the utility model;
[0023] Figure 2 It is a schematic diagram of the installation of the exhaust cylinder and the PUR foaming mold in the embodiment of the utility model;
[0024] Figure 3 It is a schematic diagram of the installation of the limiting member in the embodiment of the utility model.
[0025] Among them, 100, exhaust cylinder; 10, cylinder body; 11, exhaust port; 12, inlet and exhaust port; 20, cylinder liner; 21, inlet port, 22, limiting part; 30, cylinder top rod; 31, piston; 40, upper mold; 50, lower mold; 60, PUR foam product. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] During the manufacturing process of PUR foam products, the foam products are foamed and molded in a closed mold. The raw materials increase in volume during the foaming process and fill the mold. If there are many small concave features on the upper mold cavity surface, part of the air will be trapped in these small concave features during the process of the foaming material filling the mold cavity from bottom to top, so that there is no foaming material filling the concave features, and the foaming material will be missing at the highest point of these small convex features of the product, resulting in defective products. In this process, in order to ensure the quality of the molded product, the gas discharge in the mold cavity must be controlled to avoid defects caused by the gas being enclosed inside the mold.
[0028] Traditional PUR foaming molds usually use natural exhaust or simple manual exhaust methods, which are often inefficient and difficult to ensure the continuity and uniformity of exhaust. With the improvement of production efficiency and product quality requirements, a more efficient and reliable exhaust device is needed to meet the needs of modern PUR foaming molds.
[0029] like Figure 1-Figure 3 As shown, the utility model provides an exhaust cylinder for a PUR foaming mold, comprising: a cylinder body 10, a cylinder sleeve 20 and a cylinder push rod 30.
[0030] The cylinder block 10 is provided with an exhaust port 11 and an intake and exhaust port 12, and the position of the intake and exhaust port 12 is higher than the position of the exhaust port 11; the cylinder liner 20 is fixedly installed at the bottom of the cylinder block 10, and the inner cavity of the cylinder liner 20 is connected with the inner cavity of the cylinder block 10, and the cylinder liner 20 is provided with an intake port 21, and the position of the intake port 21 is lower than the position of the exhaust port 11, and the cylinder liner 20 is installed on the PUR foaming mold; the cylinder top rod 30 is arranged in the connecting cavity formed by the cylinder liner 20 and the cylinder block 10, and a piston 31 is arranged at the end of the cylinder top rod 30.
[0031] In this embodiment, the air inlet 21 is used to introduce air into the connecting cavity formed by the cylinder sleeve 20 and the cylinder body 10, the air outlet 11 is used to discharge the air entering the connecting cavity in the PUR foaming mold, and the air inlet and outlet 12 is used to maintain the stability of the air pressure in the upper part of the piston 31 in the cylinder body 10. When exhausting, the air in the PUR foaming mold can be discharged into the atmosphere through the exhaust cylinder 100, thereby improving the quality of the PUR foaming product 60.
[0032] Specifically, the exhaust port 11 is disposed at the bottom of the cylinder block 10 , and the intake and exhaust ports 12 are disposed at the top of the cylinder block 10 .
[0033] In some embodiments of the present application, valves are provided at the air inlet 21 , the exhaust port 11 , and the air inlet and exhaust port 12 to control the opening and closing of the air inlet 21 , the exhaust port 11 , and the air inlet and exhaust port 12 .
[0034] In this embodiment, when exhausting, different air ports have different functions and different action times at the air inlet 21, the exhaust port 11 and the air inlet and exhaust port 12. Therefore, valves are provided at the air inlet 21, the exhaust port 11 and the air inlet and exhaust port 12 to control the opening and closing of the air inlet 21, the exhaust port 11 and the air inlet and exhaust port 12 to ensure the normal operation of the exhaust cylinder 100.
[0035] In some embodiments of the present application, a gap of 0.1 mm is provided between the cylinder liner 20 and the cylinder top rod 30, and the air in the PUR foaming mold is discharged through the gap.
[0036] In this embodiment, the main purpose of this application is to discharge the air in the PUR foaming mold. A gap is provided between the cylinder liner 20 and the cylinder top rod 30, and the air in the PUR foaming mold can be discharged through the gap. At the same time, the width of the gap is set to 0.1 mm, which can ensure the circulation of air. Moreover, due to the small width of the gap, a large amount of foaming material in the PUR foaming mold will not be discharged into the gap and enter the cylinder.
[0037] In some embodiments of the present application, a limiting member 22 is provided at the bottom of the cylinder liner 20 , and the limiting member 22 is used to limit the cylinder top rod 30 on the central axis inside the cylinder liner 20 .
[0038] In this embodiment, since there is a gap between the cylinder sleeve 20 and the cylinder top rod 30, if the cylinder top rod 30 is not limited, the cylinder top rod 30 may shake left and right, affecting the exhaust effect of the exhaust cylinder 100. Therefore, the present application provides a limiting member 22 at the bottom of the cylinder sleeve 20 to ensure that the line of the cylinder top rod 30 when moving in the vertical direction is the central axis of the cylinder sleeve 20.
[0039] In some embodiments of the present application, the piston 31 is disposed in the cylinder body 10 .
[0040] In this embodiment, the piston 31 is fixedly mounted on the end of the cylinder top rod 30, and the cross section of the piston 31 is consistent with the cross section of the inner cavity of the cylinder body 10. When the piston 31 is installed in the cylinder body 10, the inner cavity of the cylinder body 10 is divided into two parts that are not connected to each other. When the exhaust cylinder 100 is reset, the position of the piston 31 is higher than the position of the exhaust port 11, at the bottom of the cylinder body 10, and just leaks out the exhaust port 11.
[0041] In some embodiments of the present application, the valves of the intake and exhaust ports 12 and the exhaust port 11 are normally open; when the exhaust cylinder 100 is exhausting, the valve of the intake port 21 is closed; when the exhaust cylinder 100 stops exhausting and resets, the valve of the intake port 21 is open.
[0042] In this embodiment, when the exhaust cylinder 100 is exhausting, the valve of the air inlet 21 is closed, and the air in the PUR foaming mold enters the gap between the cylinder top rod 30 and the cylinder sleeve 20. At this time, the pressure in the gap increases, while the pressure in the upper part of the piston 31 remains unchanged, thereby pushing the cylinder top rod 30 and the piston 31 to move upward. Since the valves of the air inlet and outlet ports 12 and the air outlet port 11 are normally open at this time, the upward movement of the cylinder top rod 30 and the piston 31 can be realized. The piston 31 moves upward, and the air outlet port 11 is connected to the gap between the cylinder top rod 30 and the cylinder sleeve 20, so that the air in the PUR foaming mold is discharged along the air outlet port 11. When the exhaust cylinder 100 stops exhausting and resets, the cylinder top rod 30 and the piston 31 are in a raised state, and a small amount of foaming material enters the gap. High-speed air is introduced through the air inlet 21 to blow out the foaming material entering the gap, and air is introduced through the air inlet and outlet ports 12 to reset the cylinder top rod 30 and the piston 31.
[0043] In some embodiments of the present application, an external thread is provided at the bottom of the cylinder liner 20, and the cylinder liner 20 is connected to the PUR foaming mold through the external thread.
[0044] In this embodiment, in order to ensure that the exhaust cylinder can be fixedly connected to the PUR foaming mold, an external thread is provided at the bottom of the cylinder sleeve 20, and the exhaust cylinder 100 is connected to the PUR foaming mold upper mold 40 through the external thread at the bottom of the cylinder sleeve 20.
[0045] In some embodiments of the present application, the cylinder block 10 and the cylinder liner 20 are sealedly connected.
[0046] In this embodiment, in order to ensure that the air in the gap can only be discharged through the exhaust port 11, the connection between the cylinder body 10 and the cylinder liner 20 is a sealed connection to ensure the tightness of the exhaust cylinder 100.
[0047] In some embodiments of the present application, the air inlet 21 is connected to an external air source.
[0048] In this embodiment, the air inlet 21 is connected to an external air source to provide high-speed air to the exhaust cylinder 100, so that the foaming material in the gap is discharged. In addition, since a valve is provided at the air inlet 21, the valve is closed when high-speed air is not needed.
[0049] To further illustrate the utility model, the working principle of the utility model is first explained: the exhaust cylinder 100 is installed on the upper mold 40 of the PUR foaming mold through the external thread at the bottom of the cylinder sleeve 20, and the valve at the air inlet 21 is kept closed, and the air in the upper mold 40 enters the gap between the cylinder push rod 30 and the cylinder sleeve 20, so that the pressure in the gap is higher than the pressure in the upper part of the piston 31, thereby pushing the cylinder push rod 30 and the piston 31 to move upward, and the air in the gap is discharged through the exhaust port 11, so that the foaming material can completely fill the concave features on the mold. When the air in the upper mold 40 enters, a small amount of foaming material also enters the gap. After the mold is opened, the valve of the air inlet 21 is opened, and high-speed air is introduced to blow out the foaming material in the gap, and air is introduced through the air inlet and exhaust ports 12 to reset the cylinder push rod 30 and the piston 31 for the next round of production.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.
Claims
1. An exhaust cylinder for a PUR foaming mold, characterized in that: include: A cylinder body, wherein an exhaust port and an inlet and exhaust port are provided on the cylinder body, and the inlet and exhaust port is located higher than the exhaust port; A cylinder liner, the cylinder liner is fixedly mounted on the bottom of the cylinder body, the inner cavity of the cylinder liner is communicated with the inner cavity of the cylinder body, an air inlet is provided on the cylinder liner, the position of the air inlet is lower than the position of the exhaust port, and the cylinder liner is mounted on a PUR foaming mold; A cylinder push rod is arranged in a connecting cavity formed by the cylinder sleeve and the cylinder body, and a piston is arranged at the end of the cylinder push rod.
2. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: The air inlet, the exhaust port and the inlet and exhaust ports are all provided with valves, and the valves are used to control the opening and closing of the air inlet, the exhaust port and the inlet and exhaust ports.
3. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: A gap of 0.1 mm is provided between the cylinder sleeve and the cylinder top rod, and the air in the PUR foaming mold is discharged through the gap.
4. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: A limiting member is provided at the bottom of the cylinder sleeve, and the limiting member is used to limit the cylinder top rod on the central axis inside the cylinder sleeve.
5. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: The piston is arranged in the cylinder body.
6. The exhaust cylinder for a PUR foaming mold according to claim 2, characterized in that: The valves of the inlet and outlet ports and the exhaust port are in a normally open state; When the exhaust cylinder is exhausting, the valve of the air inlet is in a closed state; When the exhaust cylinder stops exhausting and resetting, the valve of the air inlet is in an open state.
7. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: The bottom of the cylinder sleeve is provided with an external thread, and the cylinder sleeve is connected to the PUR foaming mold through the external thread.
8. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: The cylinder body and the cylinder liner are sealed.
9. The exhaust cylinder for a PUR foaming mold according to claim 1, characterized in that: The air inlet is connected to an external air source.