Feeding device and crystal bar drawing equipment

Abstract

The utility model provides a feeding device and crystal bar drawing equipment. The feeding device comprises a charging barrel, a feeding device and a discharging device, a containing cavity is formed in the charging barrel, and the containing cavity is used for containing silicon materials; the cover plate is detachably connected to the top of the charging barrel, a guide conical surface is arranged on the edge of the cover plate, and a concave cavity is formed in the top of the cover plate. According to the feeding device, clamping stagnation caused by interference between the feeding device and the auxiliary chamber can be avoided, the feeding device can conveniently enter the auxiliary chamber from the main furnace body, the workload of manual participation is reduced, and the feeding efficiency is improved. In addition, the concave cavity is further formed in the top of the cover plate, so that metal impurities can be collected; and the magnetic part is arranged in the concave cavity and can be used for adsorbing metal impurities, so that metal pollution caused by the fact that the metal impurities fall into the silicon liquid below is avoided, and the drawing quality of the silicon single crystal rod can be improved.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic technology, and specifically relates to a feeding device and a crystal rod pulling device. Background Art

[0002] As the photovoltaic industry strives to reduce costs and increase efficiency, continuous crystal pulling technology is now widely used in the production of single-crystal silicon ingots to reduce production costs and improve efficiency. This involves repeatedly feeding the single-crystal furnace with a feeding cylinder during the production process, increasing production capacity and reducing production costs.

[0003] However, when the existing feeding barrel is being fed into and out of the single crystal furnace, especially during the lifting process, there is a risk that the upper edge of the feeding barrel will interfere with the lower edge of the auxiliary chamber of the single crystal furnace and become stuck. Therefore, the lifting process of the feeding barrel usually requires manual intervention, which greatly increases the workload and reduces production efficiency. Moreover, during the feeding process, metal debris that falls along the tungsten wire rope can easily settle on the top of the feeding barrel and fall into the silicon liquid under the disturbance of the argon gas flow, causing metal contamination and significantly reducing the quality of the single crystal silicon rods. Utility Model Content

[0004] The present application aims to provide a feeding device and a crystal rod pulling device to at least solve some or all of the above-mentioned problems existing in the existing feeding device.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a feeding device, comprising:

[0007] A barrel, wherein a receiving cavity is provided in the barrel, and the receiving cavity is used to receive silicon material;

[0008] A cover plate is detachably connected to the top of the barrel, a guide slope is provided on the edge of the cover plate, and a concave cavity opening along the axial direction of the barrel is provided on the top of the cover plate.

[0009] In the embodiment of the present application, the edge of the cover plate on the feeding device is provided with a guiding slope. When the feeding device is lifted from the main furnace body to the auxiliary chamber, the guiding effect of the guiding slope can prevent the feeding device from interfering with the auxiliary chamber and getting stuck, making it easier for the feeding device to enter the auxiliary chamber.

[0010] In the process of feeding, the workload of manual participation is reduced and the feeding efficiency is improved. Moreover, since a concave cavity is provided on the top of the cover plate, metal impurities can be collected.

[0011] Optionally, the cover plate includes at least two sub-cover plates distributed along its circumference, and the cavity is enclosed by the sub-cover plates. That is, the cover plate is composed of at least two parts, so that the cover plate can be easily installed on the top of the barrel or removed from the top of the barrel.

[0012] Optionally, the feeding device also includes: a protective cover; wherein the protective cover is fixedly connected to the barrel and fixed between the barrel and the cover plate; the cover plate is sleeved on the side of the protective cover away from the barrel to facilitate the installation and removal of the cover plate 2; at the same time, the protective cover can play a further protective role on the end of the barrel.

[0013] Optionally, the feeding device also includes: a crossbeam and a connecting rod; wherein, the crossbeam is detachably connected to the top of the barrel, the cover plate covers the crossbeam, and a through hole is provided on the crossbeam; the connecting rod is passed through the barrel along the axial direction of the barrel, and one end of the connecting rod is connected to the bottom of the barrel, and the other end of the connecting rod passes through the through hole on the crossbeam and the cover plate, and extends out from the top of the cover plate.

[0014] In specific applications, the connecting rod can be used to bear the weight of the barrel and the silicon material within it. The portion of the connecting rod that extends from the top of the cover plate can be connected to a tungsten wire rope. The connecting rod can rise or fall with the movement of the tungsten wire rope, thereby driving the barrel up or down. The crossbeam can be used to limit the position of the connecting rod and support it, preventing it from wobbling within the barrel. This improves the stability of the barrel as it rises or falls.

[0015] Optionally, the outer surface of the connecting rod is provided with a wear-resistant layer, the wear-resistant layer comprising at least one of a rubber coating, a silicon carbide coating, and a silicon carbide nitride coating. The wear-resistant layer can be used to prevent the metal connecting rod from directly contacting the silicon material, thereby reducing the risk of introducing metal impurities into the silicon material.

[0016] Optionally, the feeding device further comprises: a connecting rod isolation tube, the connecting rod isolation tube being arranged in the accommodating cavity and sleeved outside the connecting rod; wherein,

[0017] The crossbeam is provided with a groove at a position corresponding to the connecting rod isolation tube, and the top of the connecting rod isolation tube extends into the groove. This prevents the silicon material from entering the gap between the connecting rod isolation tube and the connecting rod during the process of adding the silicon material to the barrel, thereby preventing wear and material jamming caused by the silicon material entering the gap between the connecting rod isolation tube and the connecting rod.

[0018] Optionally, the guiding inclined surface is a guiding conical surface, and the angle between the guiding conical surface and the axis of the barrel is 30°-60°.

[0019] Optionally, the feeding device is further provided with a magnetic member connected to the top of the cover plate, and configured to adsorb metal impurities. The magnetic member adsorbs the metal impurities onto the cover plate, preventing them from entering the silicon liquid in the crucible under the influence of an inert gas such as argon, thereby preventing metal contamination of the silicon liquid by the metal impurities.

[0020] Optionally, the magnetic member is connected to the concave cavity. The concave cavity can be used to accommodate the metal impurities adsorbed by the magnetic member, further preventing the metal impurities from falling into the silicon liquid in the crucible.

[0021] Optionally, the magnetic member is an annular magnetic member, and the annular magnetic member is an integral structure or a segmented structure.

[0022] In a second aspect, the present application further discloses a silicon rod drawing device, the silicon rod drawing device comprising: any one of the above-mentioned feeding devices

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic structural diagram of a feeding device described in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 A schematic cross-sectional view of the feeding device shown;

[0027] Figure 3 This is a structural schematic diagram of a cover plate according to an embodiment of the present application;

[0028] Figure 4 This is a structural schematic diagram of a beam described in an embodiment of the present application.

[0029] Reference numerals: 1-barrel, 11-accommodation chamber, 12-cone, 2-cover plate, 21-guide cone, 22-

[0030] Concave cavity, 23-mounting hole, 24-grasping groove, 3-magnetic part, 4-crossbeam, 41-groove, 5-connecting rod, 6-connecting rod isolation tube, 7-protective cover. DETAILED DESCRIPTION

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] An embodiment of the present application provides a feeding device that can be used in a crystal ingot pulling apparatus. Specifically, before or during the crystal ingot pulling process, when silicon material needs to be added, the feeding device is first hoisted into a secondary chamber of the crystal ingot pulling apparatus using a pulling device. The device is then lowered from the secondary chamber of the crystal ingot pulling apparatus into the main furnace body to add the silicon material to the crucible in the main furnace body. After the silicon material is added, the feeding device can be raised from the main furnace body into the secondary chamber until it exits the main furnace body.

[0036] Reference Figure 1 , shows a schematic structural diagram of a feeding device according to an embodiment of the present application, referring to Figure 2 , showing Figure 1 The cross-sectional structural diagram of the feeding device shown in FIG. Figure 3 , shows a schematic structural diagram of a cover plate according to an embodiment of the present application, referring to Figure 4 , showing a structural schematic diagram of a beam described in an embodiment of the present application.

[0037] like Figure 1 、 Figure 2 As shown, the feeding device may specifically include: a barrel 1, with a chamber 11 disposed therein for accommodating silicon material; a cover plate 2, detachably attached to the top of the barrel 1, with an edge provided with a guide ramp; and a top portion of the cover plate provided with a concave cavity 22 opening along the barrel's axial direction. Optionally, the guide ramp may be a guide conical surface 21. In other alternative embodiments, the guide ramp may also be a guide arc surface, provided with an inclined direction to prevent interference between the barrel and the secondary chamber.

[0038] In the embodiment of the present application, a guide cone 21 is provided on the edge of the cover plate 2 on the feeding device. During the process of lifting the feeding device from the main furnace body to the auxiliary chamber, or during the process of lifting it from the outside of the furnace body to the auxiliary chamber, the guiding effect of the guide cone 21 can prevent the feeding device from interfering with the auxiliary chamber and getting stuck, making it easier for the feeding device to enter the auxiliary chamber, reducing the workload of manual participation, and improving the feeding efficiency. Moreover, since a concave cavity 22 is also provided on the top of the cover plate 2, the concave cavity 22 can be used to receive metal impurities, preventing metal contamination caused by metal impurities falling into the silicon liquid below, thereby improving the drawing quality of the single crystal silicon rod.

[0039] Optionally, the cover plate 2 includes at least two sub-cover plates distributed along its circumference, and the sub-cover plates enclose a concave cavity 22. That is, the cover plate 2 is composed of at least two parts, so that the cover plate 2 can be easily installed on the top of the barrel 1, or the cover plate 2 can be removed from the top of the barrel 1. In this embodiment, the side wall of the concave cavity 22 is a guide cone 21. Therefore, the cover plate 2 of this embodiment can not only play a guiding role, but also prevent the feeding device from

[0040] It gets stuck when entering the sub-chamber, and can also absorb metal impurities to prevent them from entering the silicon melt.

[0041] Alternatively, as Figure 1 and Figure 2 As shown, the material removal device may further include a protective cover 7, which can be fixed to the top of the barrel 1, and the cover plate 2 can be mounted on the protective cover 7 to facilitate installation and removal of the cover plate 2. The protective cover 7 is fixedly mounted to the end of the barrel 1, which can further protect the end of the barrel 1; in addition, at least part of the side surface of the protective cover 7 can also be a tapered surface, further serving as a guide.

[0042] Alternatively, as Figure 3 As shown, the cover plate 2 is further provided with a gripping groove 24, which can be used for a user's hand or a mechanical gripper to extend into, so as to facilitate taking and placing the cover plate 2. In this embodiment, the gripping groove 24 opens in the radial direction of the cover plate 2.

[0043] Optionally, the included angle between the guide conical surface 21 and the axis of the barrel 1 is 30°-60°, so that the guide conical surface 21 has a better guiding effect. At the same time, there is sufficient space on the top of the cover plate 2 to set the cavity 22, so that the metal impurities are fully deposited in the cavity 22, thereby improving the collection effect of the cavity 22 on the metal impurities. For example, the included angle between the guide conical surface 21 and the axis of the barrel 1 can be 30°, 35°, 42°, 45°, 56°, or 60°, etc., which is not limited in the embodiments of the present application.

[0044] Alternatively, as Figure 1 、 Figure 2 As shown, the feeding device may further include: a crossbeam 4 and a connecting rod 5; wherein the crossbeam 4 is detachably connected to the top of the barrel 1; specifically, the ends of the crossbeam 4 are bolted to the protective cover 7. The cover plate 2 covers the crossbeam 4 and is provided with a through hole; the connecting rod 5 extends through the barrel 1 axially, with one end of the connecting rod 5 connected to the bottom of the barrel 1, and the other end of the connecting rod 5 passes through the through hole in the crossbeam 4 and the cover plate 2, and extends from the top of the cover plate 2. Specifically, one end of the connecting rod 5 is connected to the cone 12 at the bottom of the barrel 1.

[0045] In specific applications, the connecting rod 5 can be used to support the weight of the barrel 1 and the silicon material inside. The portion of the connecting rod 5 that extends from the top of the cover plate 2 can be connected to a tungsten wire rope. The connecting rod 5 can rise or fall with the movement of the tungsten wire rope, thereby driving the barrel 1 up or down. The crossbeam 4 can limit the position of the connecting rod 5 and support it, preventing it from shaking in the barrel 1. This improves the stability of the barrel 1 during its ascent or descent.

[0046] In a specific application, the accommodating cavity 11 in the barrel 1 can be used to accommodate silicon material that needs to be added to the crucible. The cover plate 2 on the top of the barrel 1 is detachably connected to the top of the barrel 1.

[0047] When the silicon material is added to the receiving cavity 11, the cover plate 2 can be removed from the barrel 1. After the silicon material is added to the receiving cavity 11 of the barrel 1, the cover plate 2 can be connected to the barrel 1. A cone 12 is provided at the bottom of the barrel 1, which can be used to seal the barrel 1 from the bottom.

[0048] Specifically, during the charging process of the feeding device, driven by the connecting rod 5, the barrel 1 can descend from the secondary chamber into the main furnace body and add silicon material to the crucible. Then, driven by the connecting rod 5, the barrel 1 can ascend from the main furnace body into the secondary chamber until it leaves the main furnace body. In actual applications, the movement of the tungsten wire rope and connecting rod 5 during the ascent or descent of the barrel 1 can easily generate metallic impurities, which can easily deposit on the top of the cover plate 2. Therefore, the concave cavity 22 provided on the top of the cover plate 2 can be used to collect metallic impurities and prevent them from entering the silicon melt.

[0049] Optionally, a magnetic part 3 can be provided on the cover plate 2. Through the adsorption effect of the magnetic part 3 on metal impurities, the metal impurities can be adsorbed on the cover plate 2, thereby preventing the metal impurities from entering the silicon liquid in the crucible under the blowing of inert gases such as argon, thereby preventing the metal impurities from causing metal contamination to the silicon liquid.

[0050] like Figure 1 and Figure 2 As shown, a cavity 22 is provided on the top of the cover plate 2, and the magnetic member 3 is connected to the cavity 22. The cavity 22 can be used to accommodate the metal impurities adsorbed by the magnetic member 3, further preventing the metal impurities from falling into the silicon liquid in the crucible.

[0051] In a specific application, by setting the magnetic part 3 in the cavity 22, the metal impurities can be reliably deposited in the cavity 22 through the adsorption effect of the magnetic part 3 and the deposition effect of the cavity 22, further reducing the possibility of the metal impurities entering the silicon liquid.

[0052] Optionally, the magnetic member 3 may be an annular magnetic member, which may be disposed within the concave cavity 22 as needed to increase the adsorption area for metal impurities. The annular magnetic member may be an integral structure or a segmented structure, and the specific structure of the annular magnetic member is not limited in this embodiment of the present application.

[0053] It should be noted that, in actual applications, the number of magnetic members 3 can be one or more, and the embodiment of the present application does not limit the number of magnetic members 3. Moreover, in addition to the ring shape, the shape of the magnetic member 3 can also be rectangular, circular, etc., and the embodiment of the present application does not limit the shape of the magnetic member 3.

[0054] body limited.

[0055] In a specific application, the magnetic member 3 can be detachably connected to the cover plate 2 by means of fasteners such as screws and bolts. Figure 3 As shown, a mounting hole 23 is provided in the concave cavity 22 , and the mounting hole 23 can be used for passing a fastener so as to connect the magnetic member 3 in the concave cavity 22 through the fastener.

[0056] Specifically, in order to ensure that the connecting rod 5 has sufficient strength, the connecting rod 5 can be made of metal materials such as stainless steel. Since the connecting rod 5 needs to pass through the accommodating cavity 11 of the barrel 1, wear may occur between the connecting rod 5 and the silicon material, introducing metal impurities into the silicon material.

[0057] In the above embodiments and other optional embodiments of the present application, the outer surface of the connecting rod 5 can be provided with a wear-resistant layer, which can be used to prevent the metal connecting rod 5 from directly contacting the silicon material, thereby avoiding the risk of introducing metal impurities into the silicon material.

[0058] Optionally, the wear-resistant layer includes at least one of a rubber coating, a silicon carbide coating, and a silicon nitride coating. If the wear-resistant layer is a rubber coating, the rubber coating can be tightly fitted over the connecting rod 5. The rubber coating can be made of a wear-resistant plastic or plastic material such as polytetrafluoroethylene. If the wear-resistant layer is a silicon carbide coating or a silicon nitride coating, the silicon carbide coating or silicon nitride coating can be deposited on the outer surface of the connecting rod 5 by vapor deposition.

[0059] It should be noted that in actual applications, those skilled in the art may select the rubber coating, silicon carbide coating, or silicon nitride coating as the wear-resistant layer based on actual needs. Alternatively, the rubber coating, silicon carbide coating, and silicon nitride coating may all be selected as the wear-resistant layer. That is, a layer of silicon carbide coating or silicon nitride coating is deposited on the outer surface of the connecting rod 5, and then the rubber coating is applied. The embodiment of this application does not specifically limit the implementation method of the wear-resistant layer.

[0060] In the above embodiment and other optional embodiments of the present application, the feeding device may further include: a connecting rod isolation tube 6, which is disposed in the accommodating chamber 11 and sleeved on the outside of the connecting rod 5. The connecting rod isolation tube 6 can be used to separate the silicon material from the connecting rod 5 to prevent the silicon material from being contaminated by contact and friction between the silicon material and the connecting rod 5. In actual applications, the connecting rod isolation tube 6 can be a whole structure or divided into multiple sections from top to bottom. The embodiment of the present application does not specifically limit the structure of the connecting rod isolation tube 6. The connecting rod isolation tube 6 can be any one or more of a quartz tube, a silicon tube, or a polytetrafluoroethylene tube.

[0061] In the embodiment of this application, Figure 4 As shown, the crossbeam 4 is set at a position corresponding to the connecting rod isolation tube 6

[0062] A groove 41 is provided, and the top of the connecting rod isolation tube 6 extends into the groove 41. In this way, the silicon material can be prevented from entering the gap between the connecting rod isolation tube 6 and the connecting rod 5 during the process of adding the silicon material to the barrel 1, thereby avoiding the wear and material jamming caused by the silicon material entering the gap between the connecting rod isolation tube 6 and the connecting rod 5.

[0063] Specifically, in order to facilitate the connecting rod isolation tube 6 to fully extend into the groove 41, the depth of the groove 41 can be 8-15 mm, and the diameter of the groove 41 is 2-4 mm larger than the connecting rod isolation tube 6.

[0064] In summary, the feeding device described in this application can at least include the following advantages:

[0065] In an embodiment of the present application, a guide cone is provided on the edge of the cover plate on the feeding device. During the process of lifting the feeding device from the main furnace body to the auxiliary chamber, the guiding effect of the guide cone can prevent the feeding device from interfering with the auxiliary chamber and getting stuck, making it easier for the feeding device to enter the auxiliary chamber, reducing the workload of manual participation, and improving the feeding efficiency. Moreover, since a concave cavity is also provided on the top of the cover plate, metal impurities can be collected; a magnetic part is provided in the concave cavity, and the magnetic part can be used to absorb metal impurities to avoid metal contamination caused by metal impurities falling into the silicon liquid below, thereby improving the drawing quality of the single crystal silicon rod.

[0066] An embodiment of the present application further provides a crystal rod pulling device, which may specifically include the feeding device described in any of the above embodiments.

[0067] It should be noted that in the embodiment of the present application, the structure of the feeding device is the same as that of the feeding device described in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A feeding device, characterized in that: The feeding device comprises: A barrel, wherein a receiving cavity is provided in the barrel, and the receiving cavity is used to receive silicon material; A cover plate is detachably connected to the top of the barrel, and a guide slope is provided on the edge of the cover plate; and a concave cavity opening along the axial direction of the barrel is provided on the top of the cover plate.

2. The feeding device according to claim 1, characterized in that The cover plate includes at least two sub-cover plates distributed along its circumference, and the concave cavity is formed by enclosing the sub-cover plates.

3. The feeding device according to claim 1, characterized in that The guiding inclined surface is a guiding conical surface, and the angle between the guiding conical surface and the axis of the barrel is 30°-60°.

4. The feeding device according to claim 1, characterized in that The feeding device further comprises: a protective cover; wherein, The protective cover is fixedly connected to the barrel and is located between the barrel and the cover plate; the cover plate is sleeved on the side of the protective cover away from the barrel.

5. The feeding device according to claim 1, characterized in that The feeding device further comprises: a crossbeam and a connecting rod; wherein, The crossbeam is detachably connected to the top of the barrel, the cover plate covers the crossbeam, and a through hole is provided on the crossbeam; The connecting rod is arranged in the barrel along the axial direction of the barrel, and one end of the connecting rod is connected to the bottom of the barrel, and the other end of the connecting rod passes through the through hole on the beam and the cover plate, and extends from the top of the cover plate.

6. The feeding device according to claim 5, characterized in that The outer surface of the connecting rod is provided with a wear-resistant layer, and the wear-resistant layer includes at least one of a rubber coating, a silicon carbide coating, and a silicon nitride coating.

7. The feeding device according to claim 5, characterized in that The feeding device further comprises: a connecting rod isolation tube, which is arranged in the accommodating cavity and sleeved outside the connecting rod; wherein, The crossbeam is provided with a groove at a position corresponding to the connecting rod isolation tube, and the top of the connecting rod isolation tube extends into the groove.

8. The feeding device according to any one of claims 1 to 7, characterized in that: The feeding device is further provided with a magnetic component, which is connected to the top of the cover plate and is used to absorb metal impurities.

9. The feeding device according to claim 8, characterized in that The magnetic component is an annular magnetic component, and the annular magnetic component is an integral structure or a segmented structure.

10. A silicon rod drawing device, characterized in that: The silicon rod drawing equipment comprises: the feeding device according to any one of claims 1 to 9.

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