Pretreatment device of spacing paper for photovoltaic glass raw sheet

Abstract

The utility model provides a pretreatment device for spacing paper for a photovoltaic glass sheet. The pretreatment device comprises a spacing paper roll frame, a spacing paper heating device and a paper laying machine which are sequentially arranged from left to right, the spacer paper heating device comprises a supporting base, a first vertical supporting rod, a second vertical supporting rod, a hot air cylinder and a paper direction adjusting piece, wherein the first vertical supporting rod and the second vertical supporting rod are vertically installed at the two ends of the supporting base. According to the pretreatment device for the spacing paper for the photovoltaic glass raw sheet, the independent spacing paper heating device is arranged, the spacing paper is controlled by the spacing paper heating device to evenly pass through the surface of the hot air cylinder before entering a paper laying machine, drying pretreatment is carried out, and each layer of spacing paper for the photovoltaic glass raw sheet can be accurately dried.

Description

Technical Field

[0001] This disclosure relates to the field of glass substrate processing and manufacturing technology, and in particular to a pretreatment apparatus for spacer paper used in photovoltaic glass substrates. Background Technology

[0002] Photovoltaic glass is a key component of solar photovoltaic modules, requiring characteristics such as high light transmittance, low reflectance, and high strength. In the photovoltaic power generation field, high-transmittance glass sheets are an indispensable raw material for photovoltaic modules. During the production of these glass sheets, spacer paper is often used as a protective material to prevent friction between the glass panes, which could lead to defects. This protective measure ensures that the quality and performance of the photovoltaic glass remain unaffected.

[0003] However, spacer paper is typically attached to the surface via electrostatic adsorption. Since the size of photovoltaic wafers is much larger than the cutting dimensions of existing cover glass, the electrostatic adsorption is difficult to control if the spacer paper is not pre-treated and dried. Excessive static electricity causes the spacer paper to wrinkle and become difficult to remove, while insufficient static electricity leads to inadequate adsorption, resulting in paper leakage and friction defects.

[0004] Due to the increased thickness and size of photovoltaic glass sheets, the pressure between them increases. Furthermore, the post-processing and cleaning of photovoltaic glass is relatively simple, often using flatbed cleaning machines. Excessive moisture content in the spacer paper can easily leave paper marks on the glass sheets, making post-processing cleaning difficult. Controlling the humidity in the production line environment is also challenging; therefore, pre-drying the spacer paper before laying it is necessary.

[0005] The prior art proposes a spacer paper placement mechanism for TFT-LCD glass substrates (CN 114148809 A), which includes a spacer paper conveying frame, a spacer paper guide frame, and a glass plate storage frame arranged sequentially. The spacer paper conveying frame includes a supporting base plate and a first mounting plate vertically installed at both ends of the supporting base plate. A rotating column is installed on the front side of the first mounting plate, and a storage cylinder is fixedly installed at the rear end of the rotating column; a baking rack is fixedly installed on the upper end of the first mounting plate.

[0006] As can be seen from the above-mentioned prior art, the baking rack and the spacer paper rolling mechanism in the prior art spacer paper laying mechanism are placed together. However, because multiple layers of spacer paper are rolled together, it is impossible to achieve precise drying of each layer of spacer paper and to adjust the drying area and time.

[0007] To improve the shortcomings of the spacer paper laying mechanism and optimize its use in production, a pretreatment device for the spacer paper of photovoltaic glass substrates that can accurately dry and adjust the drying area and time is still needed. Utility Model Content

[0008] One of the technical problems this disclosure aims to solve is how to accurately dry the spacer paper and adjust the drying area and time of the spacer paper.

[0009] To address the aforementioned technical problems, this disclosure provides a pretreatment apparatus for spacer paper used in photovoltaic glass substrates. The pretreatment apparatus includes: a spacer paper roll holder, a spacer paper heating device, and a paper laying machine arranged sequentially from left to right; the spacer paper extends from the spacer paper roll holder, is heated and dried on the spacer paper heating device, and then enters the paper laying machine; wherein,

[0010] The spacer paper heating device includes:

[0011] Support base;

[0012] A first vertical support rod and a second vertical support rod are vertically installed at both ends of the support base; the first vertical support rod is provided with an air inlet and an air inlet pipe for conveying hot air, and the second vertical support rod is provided with an air outlet and an air outlet pipe for discharging hot air.

[0013] A hot air cylinder is disposed between a first vertical support rod and a second vertical support rod; the air inlet pipe of the first vertical support rod and the air outlet pipe of the second vertical support rod are connected to the interior of the hot air cylinder to supply heat to the hot air cylinder; and

[0014] The paper orientation adjustment component is located between the first vertical support rod and the second vertical support rod and above the hot air cylinder. The paper passes through the gap between the paper orientation adjustment component and the hot air cylinder and enters the paper laying machine (4) through the paper orientation adjustment component.

[0015] In some embodiments, the paper orientation adjustment member includes a fixing part and an adjusting part; the fixing part is fixed between the first vertical support rod and the second vertical support rod, and the adjusting part is connected to the fixing part through a rotating device, and the adjusting part is rotatable relative to the fixing part about the rotating device as an axis.

[0016] In some embodiments, the spacer paper passes through the gap between the fixing part of the paper orientation adjustment member and the hot cylinder and enters the paper laying machine through the adjustment part. The rotatable adjustment part adjusts the relative distance between the spacer paper and the hot cylinder to adjust the contact area between the spacer paper and the hot cylinder.

[0017] In some embodiments, the hot cylinder is cylindrical; the interior of the hot cylinder includes a cylindrical air supply channel concentric with the outer shell of the hot cylinder, and the air inlet pipe of the first vertical support rod and the air outlet pipe of the second vertical support rod are connected to the cylindrical air supply channel of the hot cylinder.

[0018] In some embodiments, the hot cylinder is cylindrical; the interior of the hot cylinder includes a spirally advancing air delivery channel fixed to the outer shell of the hot cylinder, and the air inlet pipe of the first vertical support rod and the air outlet pipe of the second vertical support rod are connected to the spirally advancing air delivery channel of the hot cylinder.

[0019] In some embodiments, a waste heat gas inlet valve is provided at the air inlet of the first vertical support rod; and a waste heat gas exhaust valve is provided at the air outlet of the output hot gas of the second vertical support rod.

[0020] In some embodiments, the hot cylinder is made of a material with good thermal conductivity, which is selected from copper, silicon carbide, and aluminum.

[0021] In some embodiments, a spacer paper pressing device is also provided between the spacer paper roll holder and the spacer paper heating device.

[0022] In some embodiments, the spacer paper pressing device includes:

[0023] Support base;

[0024] Two vertical support rods are installed at both ends of the support base; a first drive device is installed inside one of the vertical support rods;

[0025] A paper-pressing crossbar is positioned between two vertical support rods; a first drive device is connected to the paper-pressing crossbar so that the paper-pressing crossbar is rotatable.

[0026] In some embodiments, the spacer paper roll holder includes:

[0027] A supporting base plate and two vertical mounting components installed at both ends of the supporting base plate; a second driving device is installed inside one of the vertical mounting components;

[0028] A rotating column is positioned between two vertical mounting components; a second drive unit is connected to the rotating column so that the rotating column is rotatable; a spacer paper roll is wound around the outside of the rotating column.

[0029] According to the above technical solution, this disclosure provides a pretreatment device for spacer paper for photovoltaic glass substrates. The spacer paper pretreatment device is equipped with a separate spacer paper heating device. The spacer paper is controlled by the spacer paper heating device to pass evenly on the surface of the hot air cylinder before entering the paper laying machine for drying pretreatment. This can accurately dry each layer of spacer paper for photovoltaic glass substrates. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1This is a general schematic diagram of the pretreatment apparatus for spacer paper for photovoltaic glass substrates disclosed in this embodiment;

[0032] Figure 2 This is a schematic diagram from another perspective of the pretreatment apparatus for spacer paper for photovoltaic glass substrates disclosed in this embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Spacer paper roll holder; 11. Vertical mounting component; 12. Second drive unit; 13. Rotating column;

[0035] 2. Spacer paper pressing device; 21. Vertical support rod; 22. First driving device; 23. Paper pressing crossbar;

[0036] 3. Spacer paper heating device; 31. First vertical support rod; 32. Second vertical support rod; 33. Hot air cylinder; 34. Paper direction adjustment component; 35. Fixing part; 36. Adjusting part; 37. Rotating device; 38. Waste heat gas inlet valve; 39. Air inlet; 310. Air outlet;

[0037] 4. Paper laying machine. Detailed Implementation

[0038] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0039] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0040] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0042] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0043] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0044] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0045] As mentioned in the background section above, in existing spacer paper laying mechanisms, the baking rack and the spacer paper winding mechanism are placed together. However, because multiple layers of spacer paper are rolled together, it is impossible to accurately dry each layer of spacer paper, and the drying area and time cannot be adjusted. To improve the shortcomings of the spacer paper laying mechanism and optimize its use in production, there is still a need for a pretreatment device for photovoltaic glass substrate spacer paper that can accurately dry and adjust the drying area and time. Based on the existing spacer paper laying mechanism, designing a separate drying device that can accurately dry each layer of spacer paper and adjust the drying area and time is believed to solve one or more problems in the existing technology.

[0046] To address the aforementioned technical problems, this utility model provides a pretreatment device for spacer paper used in photovoltaic glass substrates, such as... Figure 1-2As shown, the pretreatment device includes, from left to right, a spacer paper roll holder 1, a spacer paper heating device 3, and a paper laying machine 4. The spacer paper extends from the spacer paper roll holder 1, is heated and dried on the spacer paper heating device 3, and then enters the paper laying machine 4 for laying. In this art, the paper laying machine 4 is an automated device used to lay paper flat on a board during the packaging process to protect the board surface from scratches.

[0047] Among them, such as Figure 1-2 As shown, the spacer paper heating device 3 includes: a support base; a first vertical support rod 31 and a second vertical support rod 32 vertically installed at both ends of the support base; the first vertical support rod 31 is provided with an air inlet 39 for conveying hot air and an air inlet pipe, and the second vertical support rod 32 is provided with an air outlet 310 for outputting hot air and an air outlet pipe; a hot air cylinder 33, which is disposed between the first vertical support rod 31 and the second vertical support rod 32; the air inlet pipe of the first vertical support rod 31 and the air outlet pipe of the second vertical support rod 32 are connected to the interior of the hot air cylinder 33 to supply heat to the hot air cylinder 33; and a paper orientation adjustment component 34, which is disposed between the first vertical support rod 31 and the second vertical support rod 32 and located above the hot air cylinder 33, through which the spacer paper passes through the gap between the paper orientation adjustment component 34 and the hot air cylinder 33 and enters the paper laying machine 4.

[0048] According to the above technical solution, the pretreatment device for the spacer paper is equipped with a separate spacer paper heating device 3. The spacer paper is controlled by the spacer paper heating device 3 to pass evenly on the surface of the hot air cylinder 33 before entering the paper laying machine 4 for drying pretreatment. This can accurately dry each layer of spacer paper used for photovoltaic glass substrate.

[0049] In some embodiments, a spacer paper pressing device 2 is further provided between the spacer paper roll holder 1 and the spacer paper heating device 3. The spacer paper pressing device 2 includes: a support base; two vertical support rods 21 vertically installed at both ends of the support base; a first driving device 22 is provided in one of the vertical support rods 21; a pressing crossbar 23 is disposed between the two vertical support rods 21; the first driving device 22 is connected to the pressing crossbar 23 so that the pressing crossbar 23 is rotatable.

[0050] Specifically, the spacer paper passes through the pressure bar 23. The main function of the pressure bar 23 is to provide support for the spacer paper to change direction, so that the spacer paper can then be tightly attached to the surface of the hot cylinder 33. The first drive device 22 makes the speed of the pressure bar 23 synchronize with the paper laying machine 4 to avoid the paper being pulled apart.

[0051] In some embodiments, the spacer paper roll holder 1 includes: a supporting base plate and two vertical mounting members 11 vertically mounted at both ends of the supporting base plate; a second driving device 12 is disposed in one of the vertical mounting members 11; a rotating column 13 is disposed between the two vertical mounting members 11; the second driving device 12 is connected to the rotating column 13 so that the rotating column 13 is rotatable; and a spacer paper roll is wound around the outside of the rotating column 13.

[0052] Specifically, the production line takes out rolls of spacer paper and loads them onto the spacer paper roll holder 1. The rotating column 13 passes through the spacer paper core and is driven by the second drive device 12. The second drive speed is set synchronously with the paper laying machine 4 to prevent the paper from breaking.

[0053] In some embodiments, the paper orientation adjustment member 34 includes a fixing part 35 and an adjusting part 36; the fixing part 35 is fixed between the first vertical support rod 31 and the second vertical support rod 32, and the adjusting part 36 is connected to the fixing part 35 through a rotating device 37, and the adjusting part 36 is rotatable relative to the fixing part 35 about the rotating device 37 as an axis.

[0054] In some embodiments, the spacer paper passes through the gap between the fixing part 35 of the paper orientation adjustment member 34 and the hot air cylinder 33 and enters the paper laying machine 4 through the adjustment part 36. The rotatable adjustment part 36 adjusts the relative distance between the spacer paper and the hot air cylinder 33 to adjust the contact area between the spacer paper and the hot air cylinder 33.

[0055] By controlling the area of ​​the spacer paper and the cylinder wrap angle through the spacer paper heating device 3, the drying time is easy to control and the process is easy to adjust.

[0056] In some embodiments, the hot cylinder 33 is cylindrical; the interior of the hot cylinder 33 includes a cylindrical air supply channel concentric with the outer shell of the hot cylinder 33, and the air inlet pipe of the first vertical support rod 31 and the air outlet pipe of the second vertical support rod 32 are connected to the cylindrical air supply channel of the hot cylinder 33.

[0057] In some embodiments, the hot cylinder 33 is cylindrical; the interior of the hot cylinder 33 includes a spiral air supply channel that is fixed to the outer shell of the hot cylinder 33 and moves forward in a spiral manner. The air inlet pipe of the first vertical support rod 31 and the air outlet pipe of the second vertical support rod 32 are connected to the spiral air supply channel of the hot cylinder 33.

[0058] In some embodiments, a waste heat gas inlet valve 38 is provided at the air inlet 39 of the first vertical support rod 31; and a waste heat gas exhaust valve is provided at the air outlet 310 of the output hot gas of the second vertical support rod 32.

[0059] In some embodiments, the hot cylinder 33 is made of a material with good thermal conductivity, selected from metallic copper, silicon carbide, and metallic aluminum. The material with good thermal conductivity can be a material with a thermal conductivity greater than 240 W / m•K, for example, copper has a thermal conductivity of 398 W / m•K, silicon carbide has a thermal conductivity of 270 W / m•K, and aluminum has a thermal conductivity of 247 W / m•K.

[0060] Specifically, the spacer paper is supported by the paper-pressing crossbar 23 and passes through the upper surface of the hot air cylinder 33, ensuring that the lower surface of the spacer paper is in full contact with the surface of the hot air cylinder 33. Waste heat recovery gas from the production line is forced into the hot air cylinder 33 through the waste heat gas inlet valve 38. Specifically, the waste heat from the production line enters the hot air cylinder 33 through the inlet pipe of the first vertical support rod 31. The hot air cylinder 33 uses a material with good thermal conductivity to heat its surface, and the high temperature on the surface of the hot air cylinder 33 causes the moisture in the spacer paper to evaporate rapidly. The hot air inside the hot air cylinder 33 is discharged through the outlet pipe of the second vertical support rod 32 and flows back to the production line hot air pipe through the waste heat gas exhaust valve and the outlet 310. This return of hot air to the production line hot air pipe allows for further use while maintaining stable hot air pressure within the cavity. Furthermore, the rotatable adjusting part 36 includes a paper-pressing crossbar and two curved arms. The paper-pressing crossbar is connected to the fixed part 35 via the two curved arms and is located at the opposite end of the fixed part 35. The arc surface of the curved arms can correspond to the surface shape of the hot air cylinder 33. By rotating the device 37, the adjusting part 36 can be moved downward to increase the contact area between the spacer paper and the surface of the hot air cylinder 33, or it can be moved upward to reduce the contact area, thereby increasing or decreasing the drying time and adjusting the moisture content of the spacer paper to achieve the optimal process effect. The spacer paper passes through the gap between the fixed part 35 of the paper direction adjusting part 34 and the hot air cylinder 33, passes through the curved arms, and is supported by the paper-pressing crossbar of the adjusting part 36 before entering the paper laying machine 4.

[0061] This pretreatment device utilizes the preheating and recovery of heat energy from the glass production line furnace, making the process easy to implement. The device controls the spacer paper to pass evenly over the surface of the hot air cylinder 33 before entering the paper laying machine 4, performing a drying pretreatment; the preheating is recovered and supplied through the glass production line, making the process easy to implement.

[0062] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0063] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A pretreatment device for spacer paper used in photovoltaic glass substrates, characterized in that, The pre-processing device comprises a spacer paper roll stand (1), a spacer paper heating device (3) and a paper laying machine (4) arranged in sequence from left to right; the spacer paper is stretched out from the spacer paper roll stand (1), heated and dried on the spacer paper heating device (3) and then enters the paper laying machine (4); wherein, The spacer paper heating device (3) comprises: a support base; a first vertical support rod (31) and a second vertical support rod (32) vertically installed at both ends of the support base; the first vertical support rod (31) is provided with an air inlet (39) and an air inlet pipe for conveying hot air, and the second vertical support rod (32) is provided with an air outlet (310) and an air outlet pipe for outputting hot air; a hot air cylinder (33) arranged between the first vertical support rod (31) and the second vertical support rod (32); the air inlet pipe of the first vertical support rod (31) and the air outlet pipe of the second vertical support rod (32) are in communication with the inside of the hot air cylinder (33) to supply heat to the hot air cylinder (33); and a paper direction adjusting member (34) arranged between the first vertical support rod (31) and the second vertical support rod (32) and located at the upper part of the hot air cylinder (33); the spacer paper passes through the gap between the paper direction adjusting member (34) and the hot air cylinder (33) and enters the paper laying machine (4) through the paper direction adjusting member (34).

2. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The paper direction adjusting member (34) comprises a fixed part (35) and an adjusting part (36); the fixed part (35) is fixed between the first vertical support rod (31) and the second vertical support rod (32), the adjusting part (36) is connected with the fixed part (35) through a rotating device (37), and the adjusting part (36) is rotatable relative to the fixed part (35) with the rotating device (37) as the axis.

3. The pretreatment apparatus for the spacer paper of photovoltaic glass raw sheet according to claim 2, characterized in that, The spacer paper passes through the gap between the fixed part (35) of the paper direction adjusting member (34) and the hot air cylinder (33) and enters the paper laying machine (4) through the adjusting part (36); the rotatable adjusting part (36) adjusts the relative distance between the spacer paper and the hot air cylinder (33) to adjust the contact area between the spacer paper and the hot air cylinder (33).

4. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The hot air cylinder (33) is cylindrical; the inside of the hot air cylinder (33) comprises a cylindrical gas conveying passage concentric with the shell of the hot air cylinder (33); the air inlet pipe of the first vertical support rod (31) and the air outlet pipe of the second vertical support rod (32) are in communication with the cylindrical gas conveying passage of the hot air cylinder (33).

5. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The hot air cylinder (33) is cylindrical; the inside of the hot air cylinder (33) comprises a helical gas conveying passage fixed to the shell of the hot air cylinder (33) and advancing spirally; the air inlet pipe of the first vertical support rod (31) and the air outlet pipe of the second vertical support rod (32) are in communication with the helical gas conveying passage of the hot air cylinder (33).

6. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The first vertical support rod (31) is provided with a waste heat gas inlet valve (38) at an air inlet (39) of the first vertical support rod (31); and the second vertical support rod (32) is provided with a waste heat gas exhaust valve at an output hot gas outlet (310) of the second vertical support rod (32).

7. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The material of the hot gas cylinder (33) is a good heat-conducting material selected from copper, silicon carbide and aluminum.

8. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The spacer paper pressing device (2) is arranged between the spacer paper roll frame (1) and the spacer paper heating device (3).

9. The pretreatment apparatus for the spacer paper of photovoltaic glass raw sheet according to claim 8, characterized in that, The spacer paper pressing device (2) comprises: a support base; two vertical support rods (21) vertically mounted at both ends of the support base; one of the vertical support rods (21) is provided with a first driving device (22); a paper pressing cross rod (23) arranged between the two vertical support rods (21); the first driving device (22) is connected with the paper pressing cross rod (23) so that the paper pressing cross rod (23) is rotatable.

10. The apparatus for pretreating a separator paper for photovoltaic glass substrates according to claim 1, characterized in that, The spacer paper roll frame (1) comprises: a support base plate and two vertical mounting members (11) vertically mounted at both ends of the support base plate; one of the vertical mounting members (11) is provided with a second driving device (12); a rotating column (13) arranged between the two vertical mounting members (11); the second driving device (12) is connected with the rotating column (13) so that the rotating column (13) is rotatable; and the rotating column (13) is externally wound with a spacer paper roll.

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