Device for reducing bubbles of liquid crystal glass substrate

Abstract

The utility model discloses a device for reducing bubbles of a liquid crystal glass substrate, which comprises a sleeve I, a sleeve II and a pressure tapping buffer tube, one end of the sleeve I extends into a pressure tapping hole of a breast wall, the other end of the sleeve I is detachably fixed in the sleeve II, the other end of the sleeve II is fixed with one end of the pressure tapping buffer tube, and the other end of the sleeve II is fixed with the other end of the pressure tapping buffer tube. The casing pipe I and the casing pipe II are communicated with the pressure tapping buffer pipe; a pressure tapping pipe, a water discharging pipe and an air inlet pipe are arranged on the pressure tapping buffer pipe, a first valve is arranged on the pressure tapping pipe, the pressure tapping pipe is connected with a kiln pressure online detection device, a ball valve is arranged on the water discharging pipe, and a second valve is arranged on the air inlet pipe; the first valve, the ball valve, the second valve, the kiln pressure online detection device and the kiln pressure gate plate are electrically connected with the control system. According to the utility model, the pressure tapping path is purged at regular time, so that the blockage caused by powder accumulation and boron steam desublimation is dredged under the action of high-speed airflow, the actual kiln pressure is kept relatively stable, and the purpose of reducing the generation of bubbles is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass production, in particular to a device for reducing bubbles in a liquid crystal glass substrate. Background Art

[0002] Liquid crystal glass substrates are widely used in various display terminal devices, and their quality directly affects the display effect of the display terminal. In particular, gas inclusions in the glass need to be avoided as much as possible. In production, not only extremely high temperatures are required to melt the batch materials, but also the gaseous inclusions in the glass melt must be discharged as much as possible. The size and stability of the kiln pressure are of great significance to the discharge of bubbles.

[0003] To avoid defects of gas inclusions in glass, the main thing is to clarify the glass liquid. The clarification process is to establish a balance between the gas in the bubbles, the gas in the kiln, and the physically and chemically combined gases, and to discharge visible bubbles. If the kiln pressure is too high, it will hinder the discharge of bubbles and prolong the clarification time of the glass liquid; if the kiln pressure is too low, it will increase the cold air inhaled from the outside, causing uneven temperature distribution in the kiln and hindering the discharge of bubbles; when the kiln pressure changes continuously, the composition of the gas medium in the kiln also changes, causing changes in the local atmosphere, thereby causing changes in the surface tension of the glass liquid, causing the process of bubbles passing through the surface of the glass liquid to be unstable, and it is difficult to discharge the glass liquid under the influence of the liquid flow, thus causing the generation of bubble defects. Therefore, the size and stability of the kiln pressure are an important factor affecting the discharge of bubbles.

[0004] However, in the current production of liquid crystal glass substrates, due to the flying of batch powder under the action of airflow in the kiln, a small amount of powder accumulates in the pressure-taking hole, causing blockage; and due to the high boron content in the batch of liquid crystal glass substrates, boron volatilizes at high temperatures, and some boron vapor is condensed and sublimated in the pressure-taking pipe, causing blockage. After the pressure-taking path is blocked, the online detection value of the kiln pressure is less than the actual value. At this time, the DCS control system will control the kiln pressure gate to reduce the opening degree so that the online detection value of the kiln pressure is equal to the set value, but at this time the actual value of the kiln pressure is greater than the set value, resulting in a deviation in the actual kiln pressure.

[0005] In actual production, in order to avoid the deviation of the actual kiln pressure caused by the blockage, the kiln pressure is usually corrected by manually cleaning the blockage of the pressure-taking pipe every 2-3 hours. Since the blockage occurs gradually and slowly, the actual kiln pressure curve presents a sawtooth shape with peaks and troughs, the trough is the set value, and the peak is the offset value caused by the blockage. That is, the current method of controlling the stability of kiln pressure has the disadvantages of large actual kiln pressure offset, long offset time, and poor operability. Therefore, it is of practical significance to use a new method to stabilize the kiln pressure to reduce the generation of bubbles. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a device for reducing bubbles in liquid crystal glass substrates. By periodically purging the pressure-taking path, blockages caused by powder accumulation and boron vapor condensation are cleared under the action of high-speed air flow, so that the actual kiln pressure remains relatively stable, achieving the purpose of reducing bubble generation.

[0007] The technical solution of the utility model is as follows:

[0008] A device for reducing bubbles in liquid crystal glass substrates includes a first sleeve, a second sleeve, and a pressure-taking buffer tube. One end of the first sleeve extends into the pressure-taking hole in the breast wall, and the other end is detachably fixed in the second sleeve. The other end of the second sleeve is fixed to one end of the pressure-taking buffer tube. The first sleeve, the second sleeve, and the pressure-taking buffer tube are in communication. A pressure-taking pipe, a water discharge pipe, and an air inlet pipe are arranged on the pressure-taking buffer tube. A first valve is arranged on the pressure-taking pipe and the pressure-taking pipe is connected to the kiln pressure on-line detection device. A ball valve is arranged on the water discharge pipe, and a second valve is arranged on the air inlet pipe. The first valve, the ball valve, the second valve, the kiln pressure on-line detection device, and the kiln pressure gate are electrically connected to the control system respectively.

[0009] Preferably, a plurality of bolts are arranged on the second sleeve. After the bolts are screwed into the second sleeve, they abut against the first sleeve to fix one end of the first sleeve in the second sleeve.

[0010] Preferably, a fiberglass tape is arranged at one end of the first sleeve close to the second sleeve. The fiberglass tape is located in the second sleeve and blocks the opening at one end of the second sleeve.

[0011] Preferably, a plug is threadedly connected to the end of the pressure-taking buffer tube far from the second sleeve.

[0012] Preferably, refractory cotton is filled between the pressure-taking hole and the first sleeve, and refractory mud is covered on the outside of the refractory cotton.

[0013] Preferably, the first sleeve is made of corundum ceramic tube.

[0014] Preferably, the second sleeve is made of steel pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The device for reducing bubbles in liquid crystal glass substrates of the utility model clears blockages caused by powder accumulation and boron vapor condensation under the action of high-speed air flow by periodically purging the pressure-taking path. Due to increasing the frequency of clearing blockages, the pressure-taking path maintains a long-term stable passage state. The kiln pressure detected by the kiln pressure on-line detection device is close to the actual kiln pressure, reducing the kiln pressure deviation amount, shortening the deviation time, enhancing the operability of personnel, and finally making the actual kiln pressure remain relatively stable to achieve the purpose of reducing bubble generation. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the device for reducing bubbles in a liquid crystal glass substrate of the present utility model.

[0018] Figure 2 It is a schematic structural diagram of the first sleeve and the fiberglass tape of the present utility model.

[0019] Figure 3 It is one of the schematic diagrams when the device for reducing bubbles in a liquid crystal glass substrate of the present utility model is installed in the pressure tapping hole.

[0020] Figure 4 It is the second schematic diagram when the device for reducing bubbles in a liquid crystal glass substrate of the present utility model is installed in the pressure tapping hole.

[0021] In the figure, 1 is the first sleeve; 2 is the second sleeve; 3 is the pressure tapping buffer pipe; 4 is the breast wall; 401 is the pressure tapping hole; 5 is the pressure tapping pipe; 501 is the first valve; 6 is the water discharge pipe; 601 is the ball valve; 7 is the air inlet pipe; 701 is the second valve; 8 is the kiln pressure on-line detection device; 9 is the bolt; 10 is the fiberglass tape; 11 is the plug; 12 is the sealing clay. Specific implementation mode

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model.

[0023] Embodiment 1

[0024] As Figure 1 、 3 -4 shows, this embodiment provides a device for reducing bubbles in a liquid crystal glass substrate, including a first sleeve 1 made of corundum ceramics, a second sleeve 2 made of steel, and a pressure tapping buffer pipe 3. One end of the first sleeve 1 extends into the pressure tapping hole 401 of the breast wall 4. Three bolts 9 are provided on the second sleeve 2. After the bolts 9 are screwed into the second sleeve 2, they abut against the first sleeve 1 to fix one end of the first sleeve 1 in the second sleeve 2. The other end of the second sleeve 2 is welded to one end of the pressure tapping buffer pipe 3, and the first sleeve 1, the second sleeve 2, and the pressure tapping buffer pipe 3 are communicated. A pressure tapping pipe 5, a water discharge pipe 6, and an air inlet pipe 7 are provided on the pressure tapping buffer pipe 3. A first valve 501 (which can be an electromagnetic valve) is provided on the pressure tapping pipe 5 and the pressure tapping pipe 5 is connected to a kiln pressure on-line detection device 8 (OKANO Okano, DPC-500N12). A ball valve 601 is provided on the water discharge pipe 6, and a second valve 701 (which can be a pulse electromagnetic valve) is provided on the air inlet pipe 7; the first valve 501, the ball valve 601, the second valve 701, the kiln pressure on-line detection device 8, and the kiln pressure gate are electrically connected to the control system respectively.

[0025] Working principle:

[0026] When purging is not carried out using the device of this embodiment, valve one 501 is in the normally open state. At this time, the kiln pressure is detected by the on-line kiln pressure detection device 8 and fed back to the DCS control system. The DCS control system controls the opening of the kiln pressure gate according to the set value of the kiln pressure to correct the kiln pressure.

[0027] When it is necessary to use the device of this embodiment to purge the pressure tapping hole 401, first, the DCS control system controls the kiln pressure gate to switch from the automatic mode to the manual mode and maintains the opening before switching. After the switching is completed, Invention One is closed, and valve two 701 is opened. Compressed air enters the pressure-taking buffer pipe 3, the second sleeve 2, the first sleeve 1, and the kiln in sequence through the air inlet pipe 7. Through the high-speed air flow, the batch powder attached to the pressure tapping hole 401 and the boride condensed on the first sleeve 1, the second sleeve 2, and the pressure-taking buffer pipe 3 are separated from the pressure-taking path, thereby improving the accuracy and precision of the on-line kiln pressure detection.

[0028] After the purging is completed, valve one 501 is opened, and the kiln pressure gate switches from the manual mode to the automatic mode. The purging frequency can be controlled at once every 20 minutes, and the purging time is 2 s / time.

[0029] In addition, the drain pipe 6 on the pressure-taking buffer pipe 3 is used for discharging the condensed water precipitated after the high-temperature flue gas is cooled. The ball valve 601 on the drain pipe 6 remains normally closed and is used to isolate the pressure-taking buffer pipe 3 from the outside. The ball valve 601 discharges water regularly to prevent the accumulation of condensed water, which may cause the distortion of the kiln pressure detection.

[0030] Embodiment 2

[0031] On the basis of Embodiment 1, as Figure 2 shown, a glass fiber tape 10 is provided at one end of the first sleeve 1 close to the second sleeve 2. One end of the first sleeve 1 is rotated into the second sleeve 2, and the glass fiber tape 10 is located inside the second sleeve 2 and blocks the opening at one end of the second sleeve 2. The glass fiber tape 10 is composed of glass fibers and can withstand high temperatures, and is used for the seal between the first sleeve 1 and the second sleeve 2.

[0032] Embodiment 3

[0033] On the basis of Embodiment 1, as Figure 1 shown, a plug 11 is threadedly connected to the end of the pressure-taking buffer pipe 3 away from the second sleeve 2, which is convenient for checking whether there are solids that have not been purged inside the pressure-taking buffer pipe 3 after long-term purging after the plug 11 is unscrewed, so as to facilitate manual cleaning.

[0034] Embodiment 4

[0035] On the basis of Embodiment 1, as Figure 3As shown, refractory cotton is filled between the pressure tapping hole 401 and the first casing 1, and the outside of the refractory cotton is covered with refractory mud. The refractory cotton and the refractory mud form the sealing cotton mud 12, which is used to strengthen the seal between the inside of the kiln and the first casing.

Claims

1. Device for reducing bubbles in a liquid crystal glass substrate, characterized in that, It includes a first sleeve (1), a second sleeve (2) and a pressure-taking buffer pipe (3). One end of the first sleeve (1) extends into the pressure-taking hole (401) of the breast wall (4), and the other end is detachably fixed inside the second sleeve (2). The other end of the second sleeve (2) is fixedly connected to one end of the pressure-taking buffer pipe (3). The first sleeve (1), the second sleeve (2) and the pressure-taking buffer pipe (3) are communicated; a pressure-taking pipe (5), a water discharge pipe (6) and an air inlet pipe (7) are arranged on the pressure-taking buffer pipe (3). A first valve (501) is arranged on the pressure-taking pipe (5), and the pressure-taking pipe (5) is connected to the kiln pressure on-line detection device (8). A ball valve (601) is arranged on the water discharge pipe (6), and a second valve (701) is arranged on the air inlet pipe (7); the first valve (501), the ball valve (601), the second valve (701), the kiln pressure on-line detection device (8) and the kiln pressure gate are respectively electrically connected to the control system.

2. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, wherein, A number of bolts (9) are arranged on the second sleeve (2). After the bolts (9) are screwed into the second sleeve (2), they abut against the first sleeve (1) to fix one end of the first sleeve (1) inside the second sleeve (2).

3. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, wherein A glass fiber tape (10) is arranged at one end of the first sleeve (1) close to the second sleeve (2). The glass fiber tape (10) is located inside the second sleeve (2) and blocks the opening at one end of the second sleeve (2).

4. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, wherein, A plug (11) is threadedly connected to the end of the pressure-taking buffer pipe (3) far from the second sleeve (2).

5. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, characterized in that, Refractory cotton is filled between the pressure-taking hole (401) and the first sleeve (1), and the outside of the refractory cotton is covered with refractory mud.

6. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, wherein, The first sleeve (1) is made of corundum ceramic pipe.

7. The device for reducing bubbles in a liquid crystal glass substrate according to claim 1, characterized in that, The second sleeve (2) is made of steel pipe.

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