A PVC sheet forming mold

Abstract

The present invention discloses a PVC sheet forming die, which relates to the technical field of dies. It includes an upper die, a lower die and a temperature control unit. The upper die includes an upper die body, a driving mechanism and a detachably connected upper die orifice block. The upper die orifice block and the upper die body can be slidably matched in the vertical direction. The forming cavity is located between the upper die orifice block and the lower die. The temperature control unit includes a die temperature control machine, a thermocouple, a first heat exchange flow channel of the upper die orifice block and a second heat exchange flow channel of the lower die. The thermocouple measures the temperature of the forming cavity and is signal-connected to the control machine. First and second electric heating plates and first and second electric heating rods are also provided to assist in temperature control. The driving mechanism controls the lifting of the upper die orifice block. This die can effectively solve the problems that traditional dies are difficult to manufacture thick PVC sheets and the raw materials are likely to flow out of the die orifice prematurely. Through precise temperature control and flexible adjustment, the forming quality and production efficiency of the product are improved, and the structure is stable and easy to maintain, which can meet the needs of multiple fields for thick PVC sheets and promote the development of the industry.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly to a PVC sheet forming mold. Background Art

[0002] In many fields such as construction and decoration, PVC sheets are widely used due to their advantages such as good chemical stability, corrosion resistance, insulation, and relatively low cost. Traditional PVC sheet forming molds have played an important role in long-term production practice, but there are also obvious limitations.

[0003] Currently, the thickness of PVC sheets manufactured by traditional molds on the market is usually limited to a relatively thin range of 3 - 15 mm. With the development of the industry and the needs of some special application scenarios, the demand for thicker PVC sheets is increasing. For example, in the protective casings of some large industrial equipment and the load-bearing components of special-structured buildings, PVC sheets with a thickness exceeding 15 mm are required to meet their performance requirements such as strength and stability. However, due to the inherent characteristics of their structural design and process parameters, if traditional molds are forcibly used to manufacture thicker PVC sheets, many problems will be faced. One of the key problems is that during the sheet forming process, the molten PVC raw material flows out through the die orifice before it is fully solidified and formed. This situation not only results in the inability to obtain qualified thick PVC sheet products, but also causes a large amount of waste of raw materials, a significant reduction in production efficiency, and an unnecessary increase in production costs, seriously restricting the application expansion of PVC sheets in a wider range of fields and the further development of the industry.

[0004] Therefore, there is an urgent need for a new type of PVC sheet forming mold that can effectively solve the above problems to meet the production requirements for different thicknesses, especially thick PVC sheets, improve production efficiency and product quality, reduce production costs, and promote the technological progress of the PVC sheet-related industries. Summary of the Invention

[0005] The purpose of the present invention is to provide a PVC sheet forming mold to solve the problems existing in the above-mentioned prior art and increase the thickness of the formed PVC sheets.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] The present invention provides a PVC sheet forming mold, including an upper mold, a lower mold, and a temperature control unit. A distribution runner and a forming cavity are formed between the upper mold and the lower mold. The feed hole of the forming mold is communicated with the feed end of the distribution runner, the discharge end of the distribution runner is communicated with the feed end of the forming cavity, and the die orifice of the forming mold is the discharge end of the forming cavity;

[0008] The upper mold includes an upper mold body, a driving mechanism, and an upper mold orifice block detachably connected to the upper mold body. The upper mold orifice block is closer to the mold orifice than the upper mold body, and the upper mold orifice block is slidably engaged with the upper mold body in the vertical direction. The driving mechanism is used to drive the upper mold orifice block to move up and down relative to the upper mold body, and the forming cavity is entirely located between the upper mold orifice block and the lower mold.

[0009] The temperature control unit includes a mold temperature control machine, a thermocouple, a plurality of first heat exchange channels arranged in the upper mold orifice block, and a plurality of second heat exchange channels arranged in the lower mold. The first heat exchange channels and the second heat exchange channels are both close to the mold orifice. One end of each of the first heat exchange channels and the second heat exchange channels is connected to the liquid outlet of the mold temperature control machine, and the other end is connected to the liquid return port of the mold temperature control machine. The thermocouple is used to measure the temperature of the forming cavity, and the thermocouple is signal-connected to the temperature controller in the mold temperature control machine.

[0010] Preferably, it further includes a first electric heating plate and a second electric heating plate. The first electric heating plate is attached to the surface of the upper mold orifice block, the second electric heating plate is attached to the surface of the lower mold, and both the first electric heating plate and the second electric heating plate are close to the mold orifice.

[0011] Preferably, the temperature sensors in the first electric heating plate and the second electric heating plate are respectively signal-connected to the temperature controller in the mold temperature control machine, and both the first electric heating plate and the second electric heating plate are controlled by the temperature controller in the mold temperature control machine.

[0012] Preferably, it further includes a plurality of first electric heating rods arranged in the upper mold orifice block and a plurality of second electric heating rods arranged in the lower mold. The first electric heating rods are located above the forming cavity and are farther from the mold orifice than the first heat exchange channels, and the second electric heating rods are located below the forming cavity and are farther from the mold orifice than the second heat exchange channels.

[0013] Preferably, both the first electric heating rods and the second electric heating rods are controlled by the temperature controller in the mold temperature control machine.

[0014] Preferably, the driving mechanism includes a fixing plate fixedly connected to the upper mold body. The fixing plate is located above the upper mold orifice block. At least two vertical first threaded holes are provided on the fixing plate, and each first threaded hole is connected to a first bolt, and the bottom end of each first bolt is threadedly connected to the upper mold orifice block.

[0015] Preferably, the upper die orifice block is connected to the upper die body by a plurality of horizontally arranged second bolts, and all the second bolts are spaced apart in the horizontal direction; the upper die orifice block is provided with a vertical long hole corresponding to each of the second bolts;

[0016] The second bolt passes through the corresponding long hole and is in sliding fit with the corresponding long hole in the vertical direction and in limiting fit in the horizontal direction.

[0017] Preferably, all the first heat exchange channels are spaced apart in the horizontal direction, and all the second heat exchange channels are spaced apart in the horizontal direction.

[0018] Preferably, all the first electric heating rods are spaced apart in the horizontal direction, and all the second electric heating rods are spaced apart in the horizontal direction.

[0019] Preferably, there are 2 each of the first heat exchange channel, the second heat exchange channel, the first electric heating rod, and the second electric heating rod.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] In the temperature control unit of the PVC sheet forming die of the present invention, the die temperature controller, the thermocouple, and the first heat exchange channel provided on the upper die orifice block and the second heat exchange channel on the lower die cooperate with each other to accurately measure and control the temperature of the forming cavity. By precisely controlling the temperature, it can ensure that the molten PVC raw material solidifies and forms in the die according to the expected state, effectively avoiding the problem of premature outflow of the raw material from the die orifice due to inappropriate temperature, thereby improving the forming quality of the product and reducing the defective rate.

[0022] Furthermore, the additional first electric heating plate and second electric heating plate are respectively attached to the surfaces of the upper die orifice block and the lower die and close to the die orifice, and the first electric heating rod above the forming cavity and the second electric heating rod below further enrich the heating methods of the die. These heating components are all controlled by the temperature controller in the die temperature control machine, and can flexibly adjust the heating intensity and area according to different production process requirements, making the temperature distribution inside the die more uniform, which is beneficial to the forming of thick plates and also helps to improve production efficiency.

[0023] Furthermore, the upper die orifice block and the upper die body are driven to move relatively up and down by the first bolts on the fixing plate. At the same time, the horizontally arranged second bolts are used in cooperation with the long holes to achieve horizontal limit and sliding fit in the vertical direction. This connection method not only ensures the stability of the upper die orifice block during the lifting process, ensuring that the thickness of the forming cavity can be adjusted, thereby facilitating the adjustment of the thickness of the formed PVC sheet; but also facilitates the disassembly and maintenance of the upper die orifice block. When local wear or failure occurs in the mold, it can be quickly replaced or repaired, reducing the equipment maintenance cost and downtime, and improving the continuity and reliability of the overall production. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of the PVC sheet forming mold of the present invention;

[0026] Figure 2 Cross-sectional view of the PVC sheet forming mold of the present invention;

[0027] Figure 3 Rear view of the PVC sheet forming mold of the present invention;

[0028] In the figure: 1, upper die body; 2, lower die; 3, distribution runner; 4, forming cavity; 5, feed hole; 6, upper die orifice block; 7, fixing plate; 8, first bolt; 9, thermocouple; 10, first heat exchange runner; 11, second heat exchange runner; 12, first electric heating plate; 13, second electric heating plate; 14, first electric heating rod; 15, second electric heating rod. Detailed Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide a PVC sheet forming mold to solve the problems existing in the above-mentioned prior art and increase the thickness of the formed PVC sheet.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] As Figures 1 to 3 shown, this embodiment provides a PVC sheet forming mold, which includes an upper mold, a lower mold 2, and a temperature control unit. A distribution runner 3 and a forming cavity 4 are formed between the upper mold and the lower mold 2. The feed hole 5 of the forming mold is communicated with the feed end of the distribution runner 3, the discharge end of the distribution runner 3 is communicated with the feed end of the forming cavity 4, and the die orifice of the forming mold is the discharge end of the forming cavity 4;

[0033] The upper mold includes an upper mold body 1, a driving mechanism, and an upper die orifice block 6 detachably connected to the upper mold body 1. The upper die orifice block 6 is closer to the die orifice than the upper mold body 1, and the upper die orifice block 6 is slidably matched with the upper mold body 1 in the vertical direction. The driving mechanism is used to drive the upper die orifice block 6 to move up and down relative to the upper mold body 1, and the entire forming cavity 4 is located between the upper die orifice block 6 and the lower mold 2;

[0034] The temperature control unit includes a mold temperature control machine, a thermocouple 9, a plurality of first heat exchange channels 10 provided in the upper die orifice block 6, and a plurality of second heat exchange channels 11 provided in the lower mold 2. The first heat exchange channels 10 and the second heat exchange channels 11 are both close to the die orifice. One end of each of the first heat exchange channels 10 and the second heat exchange channels 11 is communicated with the liquid outlet of the mold temperature control machine, and the other end is communicated with the liquid return port of the mold temperature control machine; The thermocouple 9 is used to measure the temperature of the forming cavity 4, and the thermocouple 9 is signal-connected to the temperature controller in the mold temperature control machine.

[0035] In the temperature control unit of the PVC sheet forming mold of this embodiment, the mold temperature control machine, the thermocouple 9, the first heat exchange channels 10 provided in the upper die orifice block 6, and the second heat exchange channels 11 provided in the lower mold 2 cooperate with each other to accurately measure and control the temperature of the forming cavity 4. By precisely controlling the temperature, it can ensure that the molten PVC raw material solidifies and forms in the mold according to the expected state, effectively avoiding the problem of premature outflow of the raw material from the die orifice due to inappropriate temperature, thereby improving the forming quality of the product and reducing the defective rate.

[0036] In an alternative embodiment of this embodiment, preferably, a first electric heating plate 12 and a second electric heating plate 13 are further included. The first electric heating plate 12 is attached to the surface of the upper die orifice block 6, the second electric heating plate 13 is attached to the surface of the lower mold 2, and both the first electric heating plate 12 and the second electric heating plate 13 are close to the die orifice.

[0037] In addition, the temperature sensors in the first electric heating plate 12 and the second electric heating plate 13 are respectively signal-connected to the temperature controller in the mold temperature control machine, and both the first electric heating plate 12 and the second electric heating plate 13 are controlled by the temperature controller in the mold temperature control machine.

[0038] In an alternative embodiment of the present embodiment, preferably, there are also a plurality of first electric heating rods 14 arranged in the upper die orifice block 6 and a plurality of second electric heating rods 15 arranged in the lower die 2; the first electric heating rods 14 are located above the forming cavity 4 and are farther from the die orifice than the first heat exchange flow channel 10, and the second electric heating rods 15 are located below the forming cavity 4 and are farther from the die orifice than the second heat exchange flow channel 11; both the first electric heating rods 14 and the second electric heating rods 15 are controlled by a temperature controller in the mold temperature control machine.

[0039] The first electric heating plate 12 and the second electric heating plate 13 provided in this embodiment are respectively attached to the surfaces of the upper die orifice block 6 and the lower die 2 and are close to the die orifice, as well as the first electric heating rods 14 above the forming cavity 4 and the second electric heating rods 15 below, further enriching the heating methods of the mold. These heating components are all controlled by a temperature controller in the mold temperature control machine, and can flexibly adjust the heating intensity and area according to different production process requirements, making the temperature distribution inside the mold more uniform, which is beneficial to the forming of thick plates and also helps to improve production efficiency.

[0040] In an alternative embodiment of the present embodiment, preferably, the driving mechanism includes a fixing plate 7 fixedly connected to the upper die main body 1. The fixing plate 7 is located above the upper die orifice block 6. At least two vertical first threaded holes are provided on the fixing plate 7, and each first threaded hole is connected to a first bolt 8, and the bottom end of each first bolt 8 is threadedly connected to the upper die orifice block 6. By screwing the first bolts 8 on the fixing plate 7, the lifting movement of the upper die orifice block 6 can be realized.

[0041] The connection structure between the upper die orifice block 6 and the upper die main body 1 is specifically as follows:

[0042] The upper die orifice block 6 is connected to the upper die main body 1 through a plurality of horizontally arranged second bolts. All the second bolts are spaced apart in the horizontal direction; the upper die orifice block 6 is provided with a vertical long hole corresponding to each second bolt; the second bolt passes through the corresponding long hole and is in sliding fit with the corresponding long hole in the vertical direction and in limit fit in the horizontal direction.

[0043] The upper die orifice block 6 and the upper die main body 1 realize relative lifting drive through the first bolts 8 on the fixing plate 7, and at the same time use the horizontally arranged second bolts and the long holes to realize horizontal limit and vertical sliding fit. This connection method not only ensures the stability of the upper die orifice block 6 during the lifting process, ensuring that the thickness of the forming cavity 4 can be adjusted, so as to conveniently adjust the thickness of the formed PVC plate; but also facilitates the disassembly and maintenance of the upper die orifice block 6. When local wear or failure occurs in the mold, it can be quickly replaced or repaired, reducing the equipment maintenance cost and downtime, and improving the overall production continuity and reliability.

[0044] In an alternative embodiment of the present embodiment, preferably, all the first heat exchange channels 10 are spaced apart in the horizontal direction, and all the second heat exchange channels 11 are spaced apart in the horizontal direction; all the first electric heating rods 14 are spaced apart in the horizontal direction, and all the second electric heating rods 15 are spaced apart in the horizontal direction.

[0045] In this embodiment, there are 2 first heat exchange channels 10, 2 second heat exchange channels 11, 2 first electric heating rods 14, and 2 second electric heating rods 15; it should be noted that in actual applications, the quantities of the first heat exchange channels 10, the second heat exchange channels 11, the first electric heating rods 14, and the second electric heating rods 15 can be adaptively adjusted according to needs.

[0046] The PVC sheet forming die of this embodiment controls the temperatures of the upper die and the lower die 2 near the die orifice through the temperature control unit. By reducing the temperatures of the upper die and the lower die 2 near the die orifice, the PVC molten material near the die orifice in the forming cavity 4 can be cooled faster, thereby increasing the flow resistance of the PVC molten material in the forming cavity 4, so that the PVC molten material can fill the entire forming cavity 4, and thus the forming of a sheet with a larger thickness is completed.

[0047] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A PVC sheet forming mold, characterized in that: It includes an upper mold, a lower mold and a temperature control unit. A distribution runner and a molding cavity are formed between the upper mold and the lower mold. The feed hole of the molding mold is communicated with the feed end of the distribution runner. The discharge end of the distribution runner is communicated with the feed end of the molding cavity. The mold opening of the molding mold is the discharge end of the molding cavity; The upper mold includes an upper mold body, a driving mechanism and an upper mold mouth block detachably connected to the upper mold body. The upper mold mouth block is closer to the mold opening than the upper mold body, and the upper mold mouth block is slidably matched with the upper mold body in the vertical direction. The driving mechanism is used to drive the upper mold mouth block to lift relative to the upper mold body. The entire molding cavity is located between the upper mold mouth block and the lower mold; The temperature control unit includes a mold temperature control machine, a thermocouple, a plurality of first heat exchange runners arranged in the upper mold mouth block and a plurality of second heat exchange runners arranged in the lower mold. The first heat exchange runners and the second heat exchange runners are both close to the mold opening. One end of each of the first heat exchange runners and the second heat exchange runners is communicated with the liquid outlet of the mold temperature control machine, and the other end is communicated with the liquid return port of the mold temperature control machine. The thermocouple is used to measure the temperature of the molding cavity, and the thermocouple is signal-connected to the temperature controller in the mold temperature control machine; It also includes a plurality of first electric heating rods arranged in the upper mold mouth block and a plurality of second electric heating rods arranged in the lower mold. The first electric heating rods are located above the molding cavity and are farther from the mold opening than the first heat exchange runners. The second electric heating rods are located below the molding cavity and are farther from the mold opening than the second heat exchange runners. The first electric heating rods and the second electric heating rods are both controlled by the temperature controller in the mold temperature control machine; By controlling the temperature of the parts of the upper mold and the lower mold close to the mold opening through the temperature control unit, reducing the temperature of the parts of the upper mold and the lower mold close to the mold opening can make the PVC molten material near the mold opening in the molding cavity cool faster, thereby increasing the flow resistance of the PVC molten material in the molding cavity, so that the PVC molten material can fill the entire molding cavity, and thus complete the molding of a plate with a larger thickness.

2. The PVC sheet forming die according to claim 1, wherein: It also includes a first electric heating plate and a second electric heating plate. The first electric heating plate is attached to the surface of the upper mold mouth block, and the second electric heating plate is attached to the surface of the lower mold, and both the first electric heating plate and the second electric heating plate are close to the mold opening.

3. The PVC sheet forming die according to claim 2, characterized in that: The temperature sensors in the first electric heating plate and the second electric heating plate are respectively signal-connected to the temperature controller in the mold temperature control machine, and both the first electric heating plate and the second electric heating plate are controlled by the temperature controller in the mold temperature control machine.

4. The PVC sheet forming die according to claim 1, characterized in that: The driving mechanism includes a fixing plate fixedly connected to the upper mold body. The fixing plate is located above the upper mold mouth block. At least two vertical first threaded holes are provided on the fixing plate. Each first threaded hole is connected with a first bolt, and the bottom end of each first bolt is threadedly connected to the upper mold mouth block.

5. The PVC sheet forming die according to claim 1, characterized in that: The upper die orifice block is connected to the upper die body by a plurality of horizontally arranged second bolts, and all the second bolts are spaced apart in the horizontal direction; a vertical long hole is provided in the upper die orifice block corresponding to each of the second bolts; The second bolt passes through the corresponding long hole and is in sliding fit with the corresponding long hole in the vertical direction and in limit fit in the horizontal direction.

6. The PVC sheet forming mold according to claim 1, characterized in that: All the first heat exchange channels are spaced apart in the horizontal direction, and all the second heat exchange channels are spaced apart in the horizontal direction.

7. The PVC sheet forming die according to claim 6, characterized in that: All the first electric heating rods are spaced apart in the horizontal direction, and all the second electric heating rods are spaced apart in the horizontal direction.

8. The PVC sheet forming die according to claim 7, wherein: There are 2 each of the first heat exchange channel, the second heat exchange channel, the first electric heating rod and the second electric heating rod.

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