Hot bending furnace for hot bending forming of glass by self-weight method and method for hot bending forming of glass

Abstract

The invention relates to a hot bending furnace for glass hot bending forming through a self-weight method and a glass hot bending forming method. The hot bending furnace comprises a hearth, a hot bending mold is arranged in the hearth, the upper portion of the hot bending mold is used for containing glass, and a lifting movable unit is arranged below the hot bending mold and used for controlling the height of one side of the hot bending mold. The invention also provides a glass hot bending forming method which comprises the following steps: placing glass on the hot bending grinding tool, feeding the hot bending grinding tool into the hearth through the trolley, enabling the glass to be positioned below the infrared heating pipe, starting the infrared heating pipe to heat the glass until the glass is softened, and according to the fitting condition of the glass and different positions of the hot bending mold, carrying out hot bending forming on the glass. And the height of the lifting movable unit is adjusted, so that the glass in an unattached area is quickly attached to the hot bending mold, and finally hot bending forming of the glass in a vertically downward state is completed. By adopting the hot bending furnace disclosed by the invention, the number of defects such as pits and indentations caused by hot bending of glass is reduced.

Description

Technical Field

[0001] The invention relates to the field of glass hot bending, in particular to a hot bending furnace for hot bending glass using a self-weight method and a method for hot bending glass. Background Art

[0002] Self-weight glass bending is to bend the flat glass to the required curved surface by using its own weight while heating. The traditional process is to design a contoured bending mold according to the final shape of the glass. The bending mold is generally made of cast iron, ceramic or graphite. The mold is placed in a bending furnace, and then the cut and edged glass is placed on the bending mold. The infrared heating bending furnace is used to heat the glass until it softens, so that the glass and the bending mold fit completely, achieving the purpose of glass bending.

[0003] The traditional heat bending furnace includes a furnace, above which is arranged an infrared heating tube, and in the furnace below the heating tube is a furnace trolley for loading the heat bending mold and the glass.

[0004] For glass with small curvature, this traditional glass bending method is feasible. However, for glass with large curvature, when forming by self-weight method, it is often difficult to fit the mold in the area far from the center of gravity of the glass because it needs to fit normally with the bending mold. In this way, the time difference between each position of the glass fitting the mold is large. In order to achieve the final forming, it is often necessary to increase the glass bending temperature or extend the bending time. This will cause the area that fits first to form defects such as pitting and indentation to varying degrees on the glass surface. Summary of the invention

[0005] The main purpose of the present invention is to provide a heat bending furnace for glass heat bending by a self-weight method, which can reduce pitting and indentation defects caused by glass heat bending.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A heat bending furnace for glass heat bending by a self-weight method comprises a furnace chamber in which a heat bending mold is arranged. The top of the heat bending mold is used to place glass. A lifting movable unit is arranged under the heat bending mold to control the height of one side of the heat bending mold.

[0008] There are more than two lifting movable units, each of which includes a lifting rod, and the lifting rods are arranged below the hot bending mold at a distance; each lifting rod can independently and automatically control its lifting.

[0009] The lifting rod is lifted and lowered by hydraulic pressure or pneumatic pressure;

[0010] The lifting modes of the lifting rod also include screw drive, rack and pinion drive, chain drive, frying fork drive or worm gear drive.

[0011] One end of the lifting movable unit is fixed to the bottom of the trolley, and the top end of the lifting rod is against the bottom of the hot bending mold.

[0012] The hot bending mold can be adjusted in a state within a range of 360° with a bottom point of the hot bending mold as the center under the adjustment of the lifting movable unit.

[0013] Below the hot bending mold, a transverse lifting rod is arranged at a certain distance along the length direction of the glass.

[0014] Below the hot bending mold, at least one row of longitudinal lifting movable units is provided in a longitudinal direction perpendicular to the length direction of the glass. Adjacent longitudinal lifting movable units in each row are arranged at a certain distance. When there are more than two rows of longitudinal lifting movable units, a certain distance is set between each adjacent row of longitudinal lifting rods.

[0015] The minimum spacing between each adjacent row of longitudinal lifting movable units is based on the fact that the lifting rods do not interfere with each other.

[0016] A heating tube is arranged in the furnace above the glass.

[0017] The heating tube is an infrared heating tube.

[0018] The present invention also provides a method for hot bending of glass, comprising the following steps:

[0019] Place the glass on the hot bending mold, and send the hot bending mold into the furnace through a trolley so that the glass is located under the infrared heating tube. Turn on the infrared heating tube to heat the glass until it softens. According to the fit between the glass and the hot bending mold at different positions, adjust the height of the lifting and lowering movable unit to quickly fit the glass in the unfitted area with the hot bending mold, and finally complete the hot bending of the glass in a vertical downward position.

[0020] By means of the above technical solution, the present invention has at least the following advantages:

[0021] The present invention provides an independently controllable lifting movable unit at the bottom of the heat bending mold. During the glass heat bending process, the height of the independently controllable lifting movable unit is adjusted at any time according to the bonding conditions of the glass and the heat bending mold at different positions, and the shape of the heat bending mold is adjusted to quickly bond the glass in the unbonded area with the heat bending mold, thereby reducing the number of defects such as pitting and indentation caused by the heat bending of the glass and reducing the severity of the defects.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a hot bending furnace provided in an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the working state of the hot bending furnace provided by an embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of the arrangement of the lifting activity unit provided in an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the lifting state after the lifting movable unit provided by an embodiment of the present invention is arranged.

[0027] In the figure:

[0028] 1-furnace;

[0029] 2-Hot bending mold;

[0030] 3- Glass;

[0031] 4-lateral lifting activity unit, 40-hydraulic lifting rod;

[0032] 5-Heating tube.

[0033] 6- Longitudinal lifting activity unit; DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0035] like Figure 1 and Figure 2 As shown, a hot bending furnace for hot bending glass by the self-weight method includes a furnace chamber 1, in which a hot bending mold 2 is arranged, and a glass 3 is placed above the hot bending mold 2. A lifting movable unit 4 is provided below the hot bending mold 2 for controlling the height of one side of the hot bending mold 2.

[0036] By controlling the height of one side of the heat bending mold and adjusting the shape of the heat bending mold, the purpose of quickly bonding the glass in the unbonded area with the heat bending mold can be achieved, thereby reducing the number of defects such as pitting and indentation caused by heat bending of the glass.

[0037] Preferably, there are more than two lifting movable units 4, each of which includes a lifting rod 40, and the lifting rods 40 of each lifting movable unit are arranged below the hot bending mold 2 at a distance; each lifting rod 40 can independently and automatically control its lifting.

[0038] Preferably, the lifting rod 40 is lifted and lowered by hydraulic lifting or pneumatic lifting; the lifting rod of the present invention is equivalent to a piston rod;

[0039] Hydraulic lifting uses the pressure of hydraulic oil to achieve the telescopic movement of the piston rod; the working principle of hydraulic lifting is: when the hydraulic pump presses the hydraulic oil into the hydraulic cylinder, the piston moves upward due to the pressure of the hydraulic oil, thereby pushing the piston rod load up. When the hydraulic pump stops supplying oil, the hydraulic oil in the hydraulic cylinder flows back to the oil tank through the control valve, and the piston moves downward under the gravity of the load, and the piston rod and the load fall accordingly. By controlling the oil supply pressure and flow of the hydraulic pump, the lifting speed and position of the hydraulic lifting rod can be accurately controlled.

[0040] The air pressure lift is to realize the telescopic movement of the piston rod by controlling the pressure difference of the gas in the cylinder; the working principle of the air pressure lift is:

[0041] When the control lever or button is operated to open the air valve, the external gas enters the lower chamber of the cylinder under the action of the pressure difference, increasing the gas pressure in the lower chamber. The through hole on the piston keeps the gas pressure in the upper and lower chambers balanced, and the cross-sectional area of ​​the lower end of the piston rod is smaller than that of the upper end. According to the pressure formula F=PxS (where F is pressure, P is pressure intensity, and S is force area), under the same gas pressure, the pressure on the lower end is smaller than the pressure on the upper end, thereby generating an upward force, pushing the piston and the piston rod upward to achieve the rise of the gas pressure lift rod; when the control lever is pressed or pulled to open the air valve to discharge the gas in the cylinder, the gas pressure in the lower chamber of the cylinder decreases. At this time, the gas pressure in the upper chamber is greater than the gas pressure in the lower chamber, and the piston and the piston rod move downward under the action of the pressure difference, thereby achieving the descent of the gas pressure lift rod; maintain stability: when the control lever is released, the air valve is closed, the gas in the cylinder no longer circulates, the gas pressure at the upper and lower ends of the piston remains balanced, the piston rod and the connected object will remain in the current position to achieve stable support.

[0042] The lifting modes of the lifting rod also include screw drive, rack and pinion drive, chain drive, frying fork drive or worm gear drive.

[0043] Screw drive: The lifting function is achieved by converting the rotational motion of the screw into the linear motion of the nut. Screw drive has the characteristics of high precision and strong load-bearing capacity, and is suitable for occasions with high lifting precision requirements.

[0044] Gear rack type: It is composed of a gear and a rack. The rotation of the gear drives the linear motion of the rack to achieve lifting. The gear rack type has a simple structure and high transmission efficiency. It is suitable for high-speed and heavy-load lifting occasions.

[0045] Chain drive type: lifting and lowering is achieved through the transmission of the chain, which has the characteristics of simple structure and high reliability. Chain drive type is suitable for various industrial fields, such as cranes, hoists, etc.

[0046] Scissor type: It is composed of crossed rods, and the lifting is achieved by the extension and contraction of the rods. The scissor type has a simple structure and occupies a small space. It is suitable for various occasions that require lifting, such as stages, lifting platforms, etc.

[0047] Worm gear type: It consists of a worm wheel and a worm. The rotation of the worm wheel drives the linear motion of the worm, thereby achieving lifting. The worm gear type has a self-locking function and is suitable for occasions where the position needs to be kept stable.

[0048] In addition to the transmission method of the lifting rod defined in the present invention, any method that can push the lifting rod of the present invention to move up and down, thereby driving the hot bending mold to move up and down, falls within the protection scope of the present invention.

[0049] Preferably, one end of the lifting movable unit 4 is fixed to the bottom of the trolley, and the top end of the lifting rod 40 is against the bottom of the hot bending mold 2.

[0050] In order to achieve a full fit between the glass and the hot bending mold, the hot bending mold 2 can be adjusted within a 360° range with the bottom point of the hot bending mold as the center under the adjustment of the lifting movable unit.

[0051] Preferably, below the hot bending mold 2, a transverse lifting movable unit 4 is arranged at a certain distance along the length direction of the glass 3.

[0052] See also Figure 2 and Figure 3 Below the hot bending mold 2, at least one row of longitudinal lifting movable units 6 is provided in the longitudinal direction perpendicular to the length direction of the glass 3. Adjacent longitudinal lifting movable units 6 in each row are arranged at a certain distance. When there are more than two rows of longitudinal lifting movable units 6, a certain spacing a is set between each adjacent row of longitudinal lifting rods.

[0053] Preferably, the minimum spacing a between each adjacent row of longitudinal lifting movable units is based on the fact that the lifting rods do not interfere with each other.

[0054] The lifting activity unit of the present invention is Figure 3 The bending mold is arranged below the bending mold in the manner shown in the figure. According to the bending condition of the glass, the lifting movable unit at any position below the bending mold can be adjusted at any time, so that the bending mold can be adjusted in the direction of 360°. The longitudinal lifting movable unit 6 and the transverse lifting movable unit 4 can be arbitrarily combined into the following Figure 4 The adjustment straight line shown in the figure is used to adjust the heat bending mold along one side of the adjustment straight line, and finally the state of the heat bending mold can be adjusted arbitrarily according to the heat bending condition of the glass, so as to achieve the purpose of rapid bonding of the glass in the unbonded area with the heat bending mold. Figure 4 The oblique straight line in the figure indicates the lifting movable unit that needs to be lifted and lowered, and the state of the hot bending mold is adjusted on this oblique straight line.

[0055] See also Figure 2 A heating tube 5 is provided in the furnace above the glass 3.

[0056] Preferably, the heating tube 5 is an infrared heating tube.

[0057] The present invention provides a method for hot bending of glass, comprising the following steps:

[0058] Place the glass on the hot bending mold, and send the hot bending mold into the furnace through a trolley so that the glass is located under the infrared heating tube. Turn on the infrared heating tube to heat the glass until it softens. According to the fit between the glass and the hot bending mold at different positions, adjust the height of the lifting and lowering movable unit to quickly fit the glass in the unfitted area with the hot bending mold, and finally complete the hot bending of the glass in a vertical downward position.

[0059] The present invention designs a plurality of independently controllable lifting movable units at the lower part of the trolley in the furnace hall. During the process of hot bending of glass, the shape of the hot bending mold is adjusted at any time according to the glass hot bending condition, so that the glass in the unbonded area can be hot bent in a vertical downward shape, thereby reducing the severity of defects in the hot bending of glass by the self-weight method.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A heat bending furnace for heat bending glass by self-weight method, comprising a furnace chamber, a heat bending mold is arranged in the furnace chamber, and glass is placed above the heat bending mold, characterized in that: A lifting movable unit is provided below the hot bending mold to control the height of one side of the hot bending mold.

2. The heat bending furnace for glass heat bending by self-weight method according to claim 1, characterized in that: There are more than two lifting movable units, each of which includes a lifting rod, and the lifting rods are arranged below the hot bending mold at a distance; each lifting rod can independently and automatically control its lifting.

3. The heat bending furnace for heat bending glass by self-weight method according to claim 2, characterized in that: The lifting rod is lifted and lowered by hydraulic pressure or pneumatic pressure; The lifting modes of the lifting rod also include screw drive, rack and pinion drive, chain drive, frying fork drive or worm gear drive.

4. The heat bending furnace for heat bending glass by self-weight method according to claim 2, characterized in that: One end of the lifting movable unit is fixed to the bottom of the trolley, and the top end of the lifting rod is against the bottom of the hot bending mold.

5. The heat bending furnace for heat bending glass by self-weight method according to claim 4, characterized in that: The hot bending mold can be adjusted in a state within a range of 360° with a bottom point of the hot bending mold as the center under the adjustment of the lifting movable unit.

6. The heat bending furnace for heat bending glass by self-weight method according to claim 5, characterized in that: Below the heat bending mold, a transverse lifting movable unit is arranged at a certain distance along the length direction of the glass.

7. The heat bending furnace for heat bending glass by self-weight method according to claim 6, characterized in that: Below the hot bending mold, in the longitudinal direction perpendicular to the length direction of the glass, there is provided at least one row of longitudinal lifting movable units, and adjacent longitudinal lifting movable units in each row are arranged at a certain distance. When the longitudinal lifting movable units are more than two rows, a certain spacing is set between the longitudinal lifting rods of each adjacent row; the minimum spacing between the longitudinal lifting movable units in each adjacent row is based on the principle that the operation of the lifting rods does not interfere with each other.

8. The heat bending furnace for glass heat bending by self-weight method according to any one of claims 1 to 7, characterized in that: A heating tube is arranged in the furnace above the glass.

9. The heat bending furnace for heat bending glass by self-weight method according to claim 8, characterized in that: The heating tube is an infrared heating tube.

10. A method for hot bending of glass, characterized in that: The following steps are involved: Place the glass on the hot bending mold, and send the hot bending mold into the furnace through a trolley so that the glass is located under the infrared heating tube. Turn on the infrared heating tube to heat the glass until it softens. According to the fit between the glass and the hot bending mold at different positions, adjust the height of the lifting and lowering movable unit to quickly fit the glass in the unfitted area with the hot bending mold, and finally complete the hot bending of the glass in a vertical downward position.

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