Self-rotating discharge door

Abstract

The utility model discloses a self-rotating discharge door, which belongs to the technical field of stirrers and comprises a supporting seat and a door body rotatably mounted on the supporting seat. The supporting seat is hinged to the stirrer through a rotating shaft arranged at one end of the supporting seat, the rotating shaft is connected with an opening and closing motor mounted on the stirrer, and the supporting seat swings up and down under the driving of the opening and closing motor; a discharging door shaft arranged on the door body penetrates into the supporting seat and is connected with a driver arranged in the supporting seat, so that the driver drives the door body to rotate at the same rotating speed as the stirring barrel through the discharging door shaft; and a scraping plate is mounted on the unloading door shaft, is positioned between the door body and the supporting seat and is used for scraping materials falling on the upper surface of the supporting seat when rotating along with the door body. According to the device, materials accumulated on the surface of the door body can be thrown off through rotation of the door body, the situation that the materials are accumulated on the discharging door to block the discharging opening when the discharging opening is semi-opened or opened at a small angle is avoided, discharging of the materials accumulated on the door body can be accelerated through rotation of the door body, it is guaranteed that stirring and discharging are conducted at the same time, and therefore continuous operation is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mixers, and particularly relates to a self-rotating discharge door for a barrel-rotating mixer. Background Art

[0002] In the existing mixing method, all materials need to be put into the mixer first. After mixing is completed, the mixed materials are discharged from the discharge door. When there are a large number of materials to be mixed, the above steps need to be repeated multiple times, and the material turnover efficiency is low. The discharge door installed in this mixing method has only two states: closed and open. When the discharge door is opened, the materials will be directly discharged completely, and continuous operation of feeding and discharging at the same time cannot be achieved. Even if the discharge door is flipped by a certain angle through a limiting device such as a limiting arm and fixed on one side below the discharge port to make the discharge port half-open or open at a small angle, so that part of the materials can be slowly sent out, and the remaining materials can still stay in the mixing barrel for a period of time to be fully mixed, in order to achieve the purpose of continuous operation of material mixing and output. However, due to the short distance between the discharge door and the discharge port, and the discharge door loses its driving effect after being separated from the mixing barrel and is in a static state, the falling materials will accumulate on the discharge door and finally block the discharge port, making it impossible to discharge the subsequent materials, and continuous operation still cannot be effectively achieved. Summary of the Utility Model

[0003] In view of the deficiencies in the related art, the utility model provides a self-rotating discharge door to solve the problem that current material mixing and discharging cannot be carried out synchronously and continuous operation cannot be effectively achieved.

[0004] The utility model provides a self-rotating discharge door, which is applied to a mixer and includes a support seat and a door body. The mixer has a mixing barrel that can rotate. The door body is rotatably installed on the support seat to make the door body rotate coaxially with the mixing barrel when the door body closes the discharge port provided at the bottom surface of the mixing barrel.

[0005] One end of the support seat is hinged to the mixer through a rotating shaft, and the rotating shaft is connected to an opening and closing motor installed on the mixer. The support seat swings up and down under the drive of the opening and closing motor to open or close the discharge port by the door body.

[0006] Further, the opening and closing motor is a servo motor, which is used to control the distance between the door body and the discharge port when the door body opens the discharge port.

[0007] The discharge door shaft installed on the door body penetrates into the support seat and is connected to a driver installed in the support seat, so that the driver drives the door body to rotate at the same speed as the mixing barrel through the discharge door shaft.

[0008] A scraping plate is installed on the discharge door shaft. The scraping plate is located between the door body and the support seat and is used to scrape the materials falling on the upper surface of the support seat when rotating with the door body.

[0009] In this technical solution, the driving of the door body is realized by a servo motor, and the moving stroke of the door body is controllable. Thus, when the door body opens the discharge door, the distance between the door body and the discharge door can be controlled, so as to control the opening degree of the discharge door, enabling the stirred material to slowly discharge through the discharge port. At the same time, new materials can be input for stirring, and the input materials will not be quickly discharged, and can stay in the stirring barrel for a period of time to be fully stirred, realizing the synchronous progress of material stirring and discharging, and thus realizing the continuous stirring and output of materials; the driver drives the discharge door shaft connected to it to rotate, so as to throw off the materials staying on the surface of the door body, avoiding the accumulation of materials on the door body causing blockage of the discharge port and enabling the continuous stirring and smooth output of materials; secondly, the door body and the stirring barrel rotate synchronously, making them relatively stationary to each other, avoiding the splashing of materials or the blockage of the discharge port caused by the speed difference between the two; in addition, since the door body is in a rotating state, the materials falling on the upper surface of the door body are also easily thrown to the support seat close to the rotating shaft side under the action of centrifugal force. By arranging a scraping plate on the discharge door shaft, the scraping plate rotates synchronously when the discharge door shaft rotates, so as to automatically clean the materials falling or splashing on the side of the door body and the upper surface of the support seat as the door body rotates, further preventing the accumulation and blockage of materials, ensuring long-term continuous production without manual cleaning, and improving the efficiency of stirring and discharging.

[0010] In some of the embodiments, a wear-resistant plate is installed on the top surface of the door body. The wear-resistant plate is in the shape of a frustum of a cone and is inserted into the discharge port to close the discharge port.

[0011] In this technical solution, a wear-resistant plate in the shape of a frustum of a cone is arranged on the top surface of the door body. The shape of the frustum of the cone can match the discharge port, thus realizing the closing of the discharge port. At the same time, the arranged wear-resistant plate has excellent wear resistance and can resist the wear caused by the materials to it, avoiding the direct contact between the materials and the door body and damaging the surface of the door body.

[0012] In some of the embodiments, the wear-resistant plate is a rubber part.

[0013] In this technical solution, the wear-resistant plate is made of a rubber part. The rubber part has good wear resistance and oxidation resistance, stable structure and long service life. At the same time, the rubber part has a certain elastic deformation and can better fit with the discharge port, thus enhancing the sealing performance of the discharge port.

[0014] In some of the embodiments, there is a gap between the lower edge of the scraping plate and the upper surface of the support seat.

[0015] In this technical solution, there is a gap between the lower edge of the scraping plate and the upper surface of the support seat, avoiding the direct contact and friction between the scraping plate and the support seat when scraping the materials scattered on the support seat, thus avoiding damage to the scraping plate.

[0016] In some embodiments, an extension portion is provided on the side of the support seat close to the rotating shaft, and a side wall of the extension portion away from the rotating shaft is an inclined guide surface.

[0017] In this technical solution, the support seat is provided with an extension part with an inclined guide surface, which can make the material splashed on the extension part slide down along the guide surface to avoid the accumulation of materials, and also facilitate the cleaning with the scraper plate.

[0018] In some embodiments, one side edge of the door body is located on the extension line of the guide surface.

[0019] In this technical solution, one side edge of the door body is located on the extension line of the guide surface, and the door body can shield the guide surface to prevent the support seat from swinging too far and directly pouring materials onto the inclined surface, resulting in excessive material accumulation and inability to be cleaned up in time.

[0020] In some embodiments, the scraper plate is provided with a notch matching the extended portion.

[0021] In this technical solution, the shape of the scraper plate notch matches the shape of the extension part, which can quickly clean the material on the surface of the extension part and improve the cleaning effect of the scraper plate.

[0022] In some embodiments, two bearings are installed at intervals above and below the unloading door shaft, and the bearings are located in a support seat. The support seat has an oil path, and the oil path is connected to the space between the bearings. The oil path discharges oil to lubricate the bearings.

[0023] In this technical solution, two bearings are installed at intervals on the discharge door shaft. The rotation of the discharge door shaft in the bearing can reduce friction and energy loss, extend the service life of the discharge door shaft, and reduce energy consumption. At the same time, an oil circuit is set in the support seat and the space between the bearings is connected to lubricate the bearings and the discharge door shaft, further reducing the wear of the rotation of the discharge door shaft. The built-in oil circuit is self-lubricated, and there is no need to disassemble the support seat, which can increase the service life of the device and save manpower and material resources.

[0024] In some embodiments, the support seat is provided with an oil drain port, and the oil drain port is connected to the space between the bearing.

[0025] In this technical solution, an oil drain port is provided to discharge the lubricating oil from the support seat, so as to realize the circulation of the lubricating oil in the support seat, and the heat generated by the rotation of the discharge door shaft is taken away by the lubricating oil, and the heat is dissipated while lubricating, so as to avoid the discharge door shaft from overheating due to long-term rotation, which will affect the service life of the device.

[0026] In some embodiments, a sealing ring is provided between the support seat and the door body.

[0027] In this technical solution, when the device is in operation, the door body rotates relative to the support base, and the friction between the two is likely to cause damage. By setting a sealing ring, direct contact between the door body and the support base can be avoided, and at the same time, the discharge door shaft provided below the door body can be sealed to prevent materials from splashing into the gap between the discharge door shaft and the support base and causing blockage. At the same time, using a sealing ring also facilitates quick replacement. After wear, it is not necessary to process the door body and the support base, and only the sealing ring needs to be replaced, saving manpower and material resources.

[0028] Based on the above technical solution, when the materials are being stirred, the mixing barrel starts to rotate. The driver installed in the support base drives the door body to rotate at the same speed as the mixing barrel through the discharge door shaft, so that when the door body is inserted into the discharge port, it remains relatively stationary with the mixer. When the materials are stirred and discharged, the mixing barrel and the door body continue to rotate. At this time, the servo motor on the mixer starts to drive the rotating shaft to rotate, and the support base connected to the rotating shaft starts to swing downward, so that the door body is separated from the discharge port, the discharge port opens, and part of the materials fall onto the upper surface of the door body and then continue to fall. At this time, since the door body is still rotating, the materials falling onto the upper surface of the door body can be quickly thrown off, reducing the accumulation of materials on the upper surface of the discharge door during the discharging process. In addition, since the door body is rotating, the materials falling onto the upper surface of the door body are also likely to be scattered onto the support base near the rotating shaft under the action of centrifugal force. By setting a scraping plate on the discharge door shaft, the scraping plate rotates synchronously when the discharge door shaft rotates to automatically clean the materials that fall or adhere to the upper surface of the support base when rotating with the door body. There is also an extension part on the support base near the rotating shaft, and the side wall on the side away from the rotating shaft of the extension part is an inclined guiding surface. The guiding surface guides the materials to flow towards the scraping plate, and in cooperation with the scraping plate whose notch shape matches the shape of the extension part, the cleaning speed of the materials is thus increased, ensuring long-term continuous production without manual cleaning and improving the efficiency of stirring and discharging. Description of the Drawings

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0030] Figure 1 It is the front sectional view of an embodiment of the self-rotating discharge door of the present invention.

[0031] Figure 2 It is the overall schematic diagram of an embodiment of the self-rotating discharge door of the present invention.

[0032] Reference numerals: 1, support base; 101, rotating shaft; 2, door body; 201, discharge door shaft; 3, driver; 4, scraping plate; 5, wear-resistant plate; 6, extension part; 7, guiding surface; 8, bearing; 9, oil circuit; 10, sealing ring. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0035] The terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] As shown in the figure, in a schematic embodiment of the self-rotating discharge door of the present utility model, the self-rotating discharge door is applied to a mixer. The mixer has a rotatable mixing barrel. The door body 2 is rotatably installed on the support base 1 so that when the door body 2 closes the discharge port provided at the bottom surface of the mixing barrel, the door body 2 rotates coaxially with the mixing barrel;

[0038] One end of the support base 1 is hinged to the mixer through a rotating shaft 101. The rotating shaft 101 is connected to an opening and closing motor installed on the mixer. The support base 1 swings up and down under the drive of the opening and closing motor to open or close the discharge port by the door body 2;

[0039] Further, the opening and closing motor is a servo motor for controlling the distance between the door body 2 and the discharge port when the door body 2 opens the discharge port;

[0040] The discharge door shaft 201 installed on the door body 2 penetrates into the support seat 1 and is connected to the driver 3 installed in the support seat 1, so that the driver 3 drives the door body 2 to rotate at the same speed as the mixing barrel through the discharge door shaft 201;

[0041] A scraping plate 4 is installed on the discharge door shaft 201. The scraping plate 4 is located between the door body 2 and the support seat 1 and is used to scrape the material falling on the upper surface of the support seat 1 when rotating with the door body 2.

[0042] In the above-mentioned exemplary embodiment, the self-rotating discharge door realizes the driving of the door body 2 through a servo motor, and the moving stroke of the door body 2 is controllable. Therefore, when the door body 2 opens the discharge door, the distance between the door body 2 and the discharge door can be controlled, so as to control the opening degree of the discharge door, so that the stirred material slowly discharges through the discharge port. At the same time, new materials can be put in for stirring, and the put-in materials will not be quickly discharged and can stay in the mixing barrel for a period of time to be fully stirred, realizing the synchronous progress of material stirring and discharging, and thus realizing continuous stirring and output of materials; the driver 3 drives the discharge door shaft 201 connected to it to rotate, so as to throw off the material remaining on the surface of the door body 2, avoiding the blockage of the discharge port caused by the accumulation of materials on the door body 2 and making the continuous stirring and output of materials proceed smoothly.

[0043] The driver 3 is an existing power device such as a motor or a hydraulic motor that can provide rotational driving force for the shaft.

[0044] When the material leaves the mixing barrel and falls on the door body 2, if there is a rotational speed difference between the mixing barrel and the door body 2, the material will accelerate or decelerate. Accelerating will cause the material to splash rapidly and be not easy to collect; decelerating will slow down the speed at which the material is thrown off the door body 2, and the material will still accumulate on the door body 2, easily causing blockage of the discharge port.

[0045] Therefore, the door body 2 and the mixing barrel rotate synchronously to make them relatively stationary to each other, avoiding the splashing of materials or the blockage of the discharge port caused by the speed difference between the two, making the materials fall stably for easy collection and use, and at the same time making the continuous stirring and output of materials proceed smoothly.

[0046] In addition, since the door body 2 is in a rotating state, the materials falling onto the upper surface of the door body 2 are also likely to be scattered onto the support seat close to the side of the rotating shaft 101 under the action of centrifugal force. By arranging a scraping plate 4 on the discharging door shaft 201, the scraping plate 4 rotates synchronously when the discharging door shaft 201 rotates, so as to automatically clean the materials falling or scattered on the side of the door body 2 and the upper surface of the support seat 1 when rotating with the door body 2, further preventing the accumulation and blockage of materials, ensuring continuous production for a long time without manual cleaning, and improving the efficiency of stirring and discharging.

[0047] In some embodiments, when the driver 3 is a motor, the door body 2 inserted into the discharging port rotates following the stirring barrel under the action of friction, and the discharging door shaft 201 installed on the door body 2 rotates synchronously. The discharging door shaft 201 drives the output shaft of the motor, making the motor act as a generator to generate electric energy and supply power to the driver of the stirring barrel, realizing the recycling of kinetic energy and improving the energy utilization efficiency.

[0048] In some embodiments, a wear-resistant plate 5 is installed on the top surface of the door body 2. The wear-resistant plate 5 is in the shape of a frustum of a cone and is inserted into the discharging port to close the discharging port. The wear-resistant plate 5 in the shape of a frustum of a cone is arranged on the top surface of the door body 2, and the shape of the frustum can match the discharging port, thus realizing the closing of the discharging port. At the same time, the set wear-resistant plate 5 has excellent wear resistance and can resist the wear caused by the materials to it, avoiding the direct contact between the materials and the door body 2 and damaging the surface of the door body 2.

[0049] In some embodiments, the wear-resistant plate 5 is a rubber part. The wear-resistant plate 5 is made of a rubber part, which has good wear resistance and oxidation resistance, stable structure and long service life. At the same time, the rubber part has a certain elastic deformation and can better fit with the discharging port, thus enhancing the sealing performance of the discharging port.

[0050] In some embodiments, there is a gap between the lower edge of the scraping plate 4 and the upper surface of the support seat 1. There is a gap between the lower edge of the scraping plate 4 and the upper surface of the support seat 1, which avoids the direct contact and friction between the scraping plate 4 and the support seat 1 when scraping the materials scattered on the support seat 1, thus avoiding damage to the scraping plate 4.

[0051] In some embodiments, an extension part 6 is provided on one side of the support seat 1 close to the rotating shaft 101, and the side wall on the side of the extension part 6 far from the rotating shaft 101 is an inclined guiding surface 7. The support seat 1 is provided with an extension part 6 with an inclined guiding surface 7, which can make the materials falling from the discharging port and the materials scattered by the rotation of the door body 2 on the extension part 6 slide down along the guiding surface 7, avoiding the accumulation of materials and facilitating the cleaning in cooperation with the scraping plate 4.

[0052] In some embodiments, one side edge of the door body 2 is located on the extension line of the guiding surface 7. When one side edge of the door body 2 is located on the extension line of the guiding surface 7, the door body 2 can block the guiding surface 7, preventing the support base 1 from swinging at too large an angle and causing excessive accumulation of materials on the inclined surface, which cannot be cleaned in time.

[0053] In some embodiments, the scraping plate 4 is provided with a notch matching the extension part 6. The shape of the notch of the scraping plate 4 matching the shape of the extension part 6 can quickly clean the materials on the surface of the extension part 6, improving the cleaning effect of the scraping plate 4.

[0054] In some embodiments, two bearings 8 are installed at intervals up and down on the discharging door shaft 201. The bearings 8 are located inside the support base 1. The support base 1 has an oil passage 9, and the oil passage 9 communicates with the space between the bearings 8. The oil discharged from the oil passage 9 lubricates the bearings 8. Two bearings 8 are installed at intervals on the discharging door shaft 201. The discharging door shaft 201 rotates inside the bearings 8, which can reduce friction and energy loss, extend the service life of the discharging door shaft 201, reduce energy consumption. At the same time, the oil passage 9 is arranged inside the support base 1 and communicates with the space between the bearings 8, which can lubricate the bearings 8 and the discharging door shaft 201, further reducing the wear of the discharging door shaft 201 during rotation. The built-in oil passage 9 performs self-lubrication without disassembling the support base 1, which can improve the service cycle of the device and save manpower and material resources.

[0055] In some embodiments, an oil drain port is provided on the support base 1, and the oil drain port communicates with the space between the bearings 8. The oil drain port can discharge the lubricating oil from the support base 1, realizing the circulation of the lubricating oil inside the support base 1. The lubricating oil takes away the heat generated by the rotation of the discharging door shaft 201, dissipating heat while lubricating, and preventing the discharging door shaft 201 from overheating during long-term rotation, which affects the service life of the device.

[0056] In some embodiments, a sealing ring 10 is provided between the support base 1 and the door body 2. The sealing ring 10 is arranged around the discharging door shaft 201 in a ring shape. During the operation of the device, the door body 2 rotates relative to the support base 1, and the two rub against each other easily causing damage. By setting the sealing ring 10, the direct contact between the door body 2 and the support base 1 can be avoided. At the same time, it can also seal the discharging door shaft 201 arranged below the door body 2, preventing materials from splashing into the gap between the discharging door shaft 201 and the support base 1 and causing blockage. At the same time, using the sealing ring 10 is also convenient for quick replacement. After wear, it is not necessary to process the door body 2 and the support base 1, and only the sealing ring 10 needs to be replaced, saving manpower and material resources.

[0057] In the above-described exemplary embodiments, the housing 2 includes a connecting portion 201 and an assembling portion 202. The bottom of the discharge door shaft 2014 is connected to a driver 33 provided in the chamber of the assembling portion 202. The top and the side of the discharge door shaft 2014 are respectively provided with a wear-resistant plate 55 of the discharge door and a scraping plate 46 of the discharge door. In addition, a rotating shaft 1011 is provided at the bottom of the mixer. The housing 2 is connected to the rotating shaft 1011 through the connecting portion 201. When the discharge door starts to discharge, the rotating shaft 1011 rotates, driving the housing 2 connected thereto to swing downward. The wear-resistant plate 55 of the discharge door synchronously descends, and the discharge port is opened. At the same time, the driver 33 drives the discharge door shaft 2014 to rotate, thereby driving the wear-resistant plate 55 of the discharge door and the scraping plate 46 of the discharge door connected to the discharge door shaft 2014 to rotate. The wear-resistant plate 55 of the discharge door is coaxially connected to the discharge door shaft 2014, and the wear-resistant plate 55 of the discharge door rotates rapidly, throwing off and scattering the materials adhering to the wear-resistant plate 55 of the discharge door during the fall. The scraping plate 46 of the discharge door rotates around the discharge door shaft 2014 to clean the materials accumulated around the side of the discharge door shaft 2014. Through the rotation and cleaning of the wear-resistant plate 55 of the discharge door and the scraping plate 46 of the discharge door, the adhesion and accumulation of materials on the surface and the side of the discharge door are avoided, and there is no need to stop stirring for manual cleaning, ensuring that the mixer can continuously stir and discharge, and at the same time, it can also prevent materials from accumulating between the discharge door and the mixing barrel, resulting in poor sealing.

[0058] Finally, it should be noted that the embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A self-rotating discharge door, used in mixers, The mixer comprises a support base (1) and a door body (2), wherein the mixer has a rotatable mixing barrel, and the door body (2) is rotatably mounted on the support base (1) so as to enable the door body (2) to rotate coaxially with the mixing barrel when the door body (2) closes a discharge port provided on the bottom surface of the mixing barrel; The support seat (1) is hinged to the mixer via a rotating shaft (101) arranged at one end thereof, the rotating shaft (101) is connected to an opening and closing motor installed on the mixer, and the support seat (1) swings up and down under the drive of the opening and closing motor, so as to enable the door body (2) to open or close the discharge port; It is characterized in that The opening and closing motor is a servo motor, which is used to control the distance between the door body (2) and the discharge port when the door body (2) opens the discharge port; The discharge door shaft (201) installed on the door body (2) penetrates into the support seat (1) and is connected to the driver (3) installed in the support seat (1), so that the driver (3) drives the door body (2) to rotate at the same speed as the mixing barrel through the discharge door shaft (201); A scraper plate (4) is installed on the discharge door shaft (201), and the scraper plate (4) is located between the door body (2) and the support seat (1), and is used to scrape off materials that fall on the upper surface of the support seat (1) when the door body (2) rotates.

2. The self-rotating discharge door according to claim 1 is characterized in that: A wear-resistant plate (5) is installed on the top surface of the door body (2), and the wear-resistant plate (5) is in the shape of a cone. The wear-resistant plate (5) is inserted into the discharge port to close the discharge port.

3. The self-rotating discharge door according to claim 2 is characterized in that: The wear-resistant plate (5) is a rubber piece.

4. The self-rotating discharge door according to claim 1 is characterized in that: There is a gap between the lower edge of the scraper plate (4) and the upper surface of the support seat (1).

5. The self-rotating discharge door according to claim 1 is characterized in that: An extension portion (6) is provided on a side of the support seat (1) close to the rotating shaft (101), and a side wall of the extension portion (6) away from the rotating shaft (101) is an inclined guide surface (7).

6. The self-rotating discharge door according to claim 5, characterized in that: One side edge of the door body (2) is located on the extension line of the guide surface (7).

7. The self-rotating discharge door according to claim 5, characterized in that: The scraper plate (4) is provided with a notch matching the extended portion (6).

8. The self-rotating discharge door according to claim 1, characterized in that: The unloading door shaft (201) is provided with two bearings (8) spaced apart from each other in the upper and lower parts. The bearings (8) are located in the support seat (1). The support seat (1) has an oil passage (9) which communicates with the space between the bearings (8).

9. The self-rotating discharge door according to claim 8, characterized in that: The support seat (1) is provided with an oil drain port, and the space between the oil drain port and the bearing (8) is communicated.

10. The self-rotating discharge door according to claim 1, characterized in that: A sealing ring (10) is provided between the support seat (1) and the door body (2).

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