Auxiliary temperature adjusting device for glass overflow down-draw forming

Abstract

The application discloses an auxiliary temperature adjusting device for glass overflow down-draw forming, which comprises a cooling pipe, the cooling pipe is sequentially arranged by a plurality of pipe units, the pipe unit is composed of an outer pipe and an inner pipe, the inner pipe is located in the outer pipe to divide the outer pipe into an inner flow channel located in the inner pipe and an outer flow channel located between the outer wall of the inner pipe and the inner wall of the outer pipe, and a valve assembly is arranged between any two adjacent pipe units to enable the liquid in the inner flow channel / outer flow channel in the pipe unit to flow into the inner flow channel or the outer flow channel of the adjacent pipe unit by the action of the valve assembly. The auxiliary temperature adjusting device for glass overflow down-draw forming is connected with the two adjacent pipe units by the valve assembly, the valve assembly is actuated according to the temperature adjusting requirements of different parts of the glass, the cooling liquid sequentially passes through the outer flow channel or the inner flow channel in the plurality of pipe units, and the cooling liquid and the glass are adjacent to each other in the flowing process to cool the glass.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, and in particular to an auxiliary temperature control device for glass overflow pull-down forming. Background Technology

[0002] In the process of producing glass substrates using the overflow down-draw method, molten glass flows down through the outlet of the overflow down-draw forming equipment, then cools and solidifies into a solid glass sheet. It is then pulled down by traction rollers to form a glass sheet of a certain thickness. However, during the glass cooling process, different parts of the glass cool at different rates. For example, the middle part cools slower, the edge part cools faster, the thicker part cools slower, and the thinner part cools faster. As the glass temperature increases, glass molecules will move from the hotter part to the colder part, resulting in uneven glass thickness and affecting the glass quality. Therefore, it is necessary to adjust the glass temperature.

[0003] However, existing temperature control devices typically use cooling pipes to directly cool the glass. The glass adjacent to the cooling pipes exchanges heat with them for temperature control. However, for glass of different thicknesses, the temperature control part of the cooling pipe cannot be adjusted according to specific usage needs. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes an auxiliary temperature control device for glass overflow pull-down forming.

[0005] The present invention proposes an auxiliary temperature control device for glass overflow drawing forming, comprising a cooling pipe, which is composed of multiple pipe units arranged sequentially. Each pipe unit consists of an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe to divide the outer pipe into an inner flow channel located inside the inner pipe and an outer flow channel located between the outer wall of the inner pipe and the inner wall of the outer pipe. A valve assembly is installed between any two adjacent pipe units so that the operation of the valve assembly can allow the liquid in the inner / outer flow channel of the pipe unit to flow into the inner or outer flow channel of the adjacent pipe unit.

[0006] Preferably, "a valve assembly is installed between any two adjacent pipe units" specifically means:

[0007] Two adjacent pipe units are designated as a first pipe unit and a second pipe unit. The first pipe unit has a first internal flow channel and a first external flow channel, and the second pipe unit has a second internal flow channel and a second external flow channel. A valve assembly is connected between the first pipe unit and the second pipe unit. The valve assembly specifically includes a first three-way valve and a second three-way valve. The inlet of the first three-way valve is connected to the first internal flow channel, the first outlet of the first three-way valve is connected to the second internal flow channel, and the second outlet of the first three-way valve is connected to the second external flow channel. The inlet of the second three-way valve is connected to the first external flow channel, the first outlet of the second three-way valve is connected to the second external flow channel, and the second outlet of the second three-way valve is connected to the second internal flow channel.

[0008] Preferably, "the second outlet of the first three-way valve is connected to the second external flow channel" specifically means:

[0009] The second outlet of the first three-way valve is connected to the second three-way valve so that the second outlet of the first three-way valve is connected to the second external flow channel through the second outlet of the second three-way valve.

[0010] Preferably, "the second outlet of the second three-way valve is connected to the second internal flow channel" specifically means:

[0011] The second outlet of the second three-way valve is connected to the first three-way valve so that the second outlet of the second three-way valve is connected to the second internal flow channel through the second outlet of the first three-way valve.

[0012] This invention proposes an auxiliary temperature control device for glass overflow pull-down forming, which also includes a third three-way valve. The inlet of the third three-way valve is connected to the outlet of the external coolant circulation system. The first outlet of the third three-way valve is connected to the outer pipe in the cooling pipe inlet end pipe unit. The second outlet of the third three-way valve is connected to the inner pipe in the cooling pipe inlet end pipe unit. Both the inner pipe and the outer pipe in the cooling pipe outlet end pipe unit are connected to the inlet of the external coolant circulation system.

[0013] Preferably, the inner tube is made of heat-insulating material and the outer tube is made of heat-conducting material.

[0014] Preferably, a check valve is installed in the inlet of both the first three-way valve and the second three-way valve.

[0015] The auxiliary temperature control device for glass overflow pull forming proposed in this invention has a valve assembly that connects two adjacent pipe units. The valve assembly operates according to the temperature control requirements of different parts of the glass, causing the coolant to sequentially pass through the outer or inner channels of multiple pipe units. When the coolant passes through the outer channel, it is adjacent to the glass and cools the glass during the flow process. When the coolant passes through the inner channel, it is adjacent to the outer channel, and the outer channel isolates the glass from the coolant, preventing the glass from being cooled and allowing the coolant to enter the next outer channel for cooling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an auxiliary temperature control device for glass overflow pull-down forming proposed in this invention;

[0017] Figure 2 This is a schematic cross-sectional view of the internal structure of the valve assembly in an auxiliary temperature control device for glass overflow pull-down forming proposed in this invention. Detailed Implementation

[0018] Reference Figure 1 The present invention proposes an auxiliary temperature control device for glass overflow drawing forming, including a cooling pipe, which is composed of multiple pipe units 1 arranged in sequence. Each pipe unit consists of an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe to divide the outer pipe into an inner flow channel located inside the inner pipe and an outer flow channel located between the outer wall of the inner pipe and the inner wall of the outer pipe. A valve assembly 2 is installed between any two adjacent pipe units 1 so that the operation of the valve assembly can allow the liquid in the inner / outer flow channel of the pipe unit to flow into the inner or outer flow channel of the adjacent pipe unit 1.

[0019] Specifically, "a valve assembly 2 is installed between any two adjacent pipe units 1" means:

[0020] Two adjacent pipe units 1 are respectively a first pipe unit 11 and a second pipe unit 12. The first pipe unit 11 has a first inner flow channel 111 and a first outer flow channel 112. The second pipe unit 12 has a second inner flow channel 121 and a second outer flow channel 122. A valve assembly 2 is connected between the first pipe unit 11 and the second pipe unit 12. The valve assembly 2 specifically includes a first three-way valve 21 and a second three-way valve 22. The inlet of the first three-way valve 21 is connected to the first inner flow channel 111. The first outlet of the first three-way valve 21 is connected to the second inner flow channel 121. The second outlet of the first three-way valve 21 is connected to the second outer flow channel 122. The inlet of the second three-way valve 22 is connected to the first outer flow channel 112. The first outlet of the second three-way valve 22 is connected to the second outer flow channel 122. The second outlet of the second three-way valve 22 is connected to the second inner flow channel 121.

[0021] In the above embodiment, the inlet of the third three-way valve is connected to the outlet of the external coolant circulation system, the first outlet of the third three-way valve is connected to the outer pipe in the cooling pipe inlet end pipe unit, the second outlet of the third three-way valve is connected to the inner pipe in the cooling pipe inlet end pipe unit, and both the inner and outer pipes in the cooling pipe 1 outlet end pipe unit are connected to the inlet of the external coolant circulation system.

[0022] The auxiliary temperature control device for glass overflow pull-down forming proposed in this invention is horizontally arranged between the overflow pull-down forming equipment and the traction roller. There are two sets of devices arranged symmetrically, and the water inlet end of the cooling pipe is set corresponding to the edge of the glass. It is used to control the temperature of the glass passing through the outlet of the overflow pull-down forming equipment.

[0023] In the existing technology, when the traction roller assembly drives the glass to move, it clamps the edge of the glass. When the glass mass at the edge is reduced to a certain extent (when the thickness of the clamping area at the edge of a 0.5mm thick glass plate is ≤0.4mm), the traction roller is prone to crushing the edge of the glass plate. Due to the cohesive force (surface tension) of the glass, the glass molecules at the edge will concentrate towards the center, resulting in a reduction in the amount of glass material at the edge. When the traction roller assembly clamps the glass, it is easy for the glass to break, making production impossible.

[0024] To solve the above problems, the auxiliary temperature control device proposed in this invention specifically cools down the edge of the glass. The working process of the auxiliary cooling device is as follows:

[0025] Coolant enters the first external flow channel 111 in the outermost pipe unit 1 (first pipe unit 11) through the first outlet of the third three-way valve. The first external flow channel 111 is adjacent to the glass and carries away the heat on the glass during the flow to cool it down. Then, when it enters the next pipe unit 1 (second pipe unit 12) through the valve assembly 2, if the glass in the corresponding second pipe unit 12 does not need to be cooled, the second outlet of the second three-way valve 22 is opened and the first outlet of the second three-way valve 22 is closed. Coolant enters through the inlet of the second three-way valve 22 and enters the second internal flow channel 121 of the second pipe unit 12 through the first outlet. At this time, the second external flow channel 111 in the second pipe unit 12 isolates the glass from the second internal flow channel 121. In order to avoid heat exchange between the fluid passing through the second internal flow channel 121 and the glass, the inner tube is made of heat-insulating material and the outer tube is made of heat-conducting material. The fluid enters the external or internal flow channel in the next pipe unit 1 through the second internal flow channel 121 and the valve assembly 2.

[0026] As the glass gradually cools to near its softening point (950°C), the outermost pipe unit 1 (first pipe unit 11) cools the edge of the effective surface of the glass plate, while the middle area remains uncooled. Since the glass molecules are still active and mobile near the softening point, the glass material that has gathered towards the center due to the cohesive force of the glass will move to both sides as the temperature rises. This results in a decrease in the mass of the glass plate in the middle and an increase in the mass of the glass material on both sides, thereby increasing the thickness of the glass in the clamping area of ​​the traction roller. This reduces the possibility of the glass plate breaking due to its thinness and thus improves the product yield.

[0027] In the above embodiment, "the second outlet of the first three-way valve 21 is connected to the second external flow channel 122" can be specifically defined as follows:

[0028] The second outlet of the first three-way valve 21 is connected to the second three-way valve 22 so that the second outlet of the first three-way valve 21 is connected to the second external flow channel 122 through the second outlet of the second three-way valve 22.

[0029] Similarly, "the second outlet of the second three-way valve 22 is connected to the second internal flow channel 121" specifically means:

[0030] The second outlet of the second three-way valve 22 is connected to the first three-way valve 21 so that the second outlet of the second three-way valve 22 is connected to the second internal flow channel 121 through the second outlet of the first three-way valve 21.

[0031] In the above embodiments, in order to prevent fluid from flowing back through the inlets of the first three-way valve 21 and the second three-way valve 22, a one-way valve is installed in the inlet of both the first three-way valve 21 and the second three-way valve 22.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An auxiliary temperature control device for glass overflow pull-down forming, characterized in that, The cooling pipe is composed of multiple pipe units (1) arranged in sequence. Each pipe unit (1) includes an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe to divide the outer pipe into an inner flow channel located inside the inner pipe and an outer flow channel located between the outer wall of the inner pipe and the inner wall of the outer pipe. A valve assembly (2) is installed between any two adjacent pipe units (1) so that the valve assembly can be activated to allow liquid in the inner or outer flow channel of the pipe unit to flow into the inner or outer flow channel of the adjacent pipe unit (1).

2. The auxiliary temperature control device for glass overflow drawing forming according to claim 1, characterized in that, "A valve assembly (2) is installed between any two adjacent pipe units (1)" specifically means: Two adjacent pipe units (1) are a first pipe unit (11) and a second pipe unit (12), respectively. The first pipe unit (11) has a first internal flow channel (111) and a first external flow channel (112), and the second pipe unit (12) has a second internal flow channel (121) and a second external flow channel (122). A valve assembly (2) is connected between the first pipe unit (11) and the second pipe unit (12). The valve assembly (2) specifically includes a first three-way valve (21) and a second three-way valve (22). The inlet of the first three-way valve (21) is connected to the first inner flow channel (111), the first outlet of the first three-way valve (21) is connected to the second inner flow channel (121), the second outlet of the first three-way valve (21) is connected to the second outer flow channel (122), the inlet of the second three-way valve (22) is connected to the first outer flow channel (112), the first outlet of the second three-way valve (22) is connected to the second outer flow channel (122), and the second outlet of the second three-way valve (22) is connected to the second inner flow channel (121).

3. The auxiliary temperature control device for glass overflow pull-down forming according to claim 2, characterized in that, "The second outlet of the first three-way valve (21) is connected to the second external flow channel (122)" specifically means: The second outlet of the first three-way valve (21) is connected to the second three-way valve (22) so that the second outlet of the first three-way valve (21) is connected to the second external flow channel (122) through the second outlet of the second three-way valve (22).

4. The auxiliary temperature control device for glass overflow pull-down forming according to claim 2, characterized in that, "The second outlet of the second three-way valve (22) is connected to the second internal flow channel (121)" specifically means: The second outlet of the second three-way valve (22) is connected to the first three-way valve (21) so that the second outlet of the second three-way valve (22) is connected to the second internal flow channel (121) through the second outlet of the first three-way valve (21).

5. The auxiliary temperature control device for glass overflow pull-down forming according to claim 1, characterized in that, It also includes a third three-way valve, the inlet of which is connected to the outlet of the external coolant circulation system, the first outlet of which is connected to the outer pipe in the inlet pipe unit of the cooling pipe (1), the second outlet of which is connected to the inner pipe in the inlet pipe unit of the cooling pipe (1), and both the inner and outer pipes in the outlet pipe unit of the cooling pipe (1) are connected to the inlet of the external coolant circulation system.

6. The auxiliary temperature control device for glass overflow pull-down forming according to claim 1, characterized in that, The inner tube is made of heat-insulating material, and the outer tube is made of heat-conducting material.

7. The auxiliary temperature control device for glass overflow pull-down forming according to claim 1, characterized in that, One-way valves are installed in the inlets of both the first three-way valve (21) and the second three-way valve (22).

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