Feeding device applied to levodopa production

Abstract

A kind of application is used in the feeding device of levodihydrophenylglycine production, it is related to feeding equipment field, including shell, filter screen is installed in shell interior, gas outlet is set up with the space above filter screen on shell, and feed inlet is set up with the space below filter screen, filter screen is woven from elastic silk thread;Support, support in the upside of filter screen, so that keep the position of filter screen stable when airflow passes;Nut, fixed in the center of filter screen;Screw rod, pass through the center of nut, and spiral connection with nut;Motor, fixedly installed on the top of shell, the output shaft of motor is fixedly connected with the upper end of screw rod, to drive screw rod rotation.In the application, filter screen is woven from elastic fiber, when needing to clean filter screen, make filter screen stretch downward under the drive of motor, after stretching, the material of agglomeration and filter screen between loose, so that more easily be blown off by backflow airflow.

Description

Technical Field

[0001] This invention belongs to the field of feeding equipment, and particularly relates to a feeding device for the production of L-dihydrophenylglycine. Background Technology

[0002] In the production of L-dihydrophenylglycine, a vacuum feeding device is needed to transport the powdered raw material into the reactor. The working principle of the vacuum feeding device is that the airflow generated by the blower draws the powdered material to the top of the reactor, and then the material is separated from the air by a filter screen. After separation, the material falls into the reactor, thus achieving feeding.

[0003] In production practice, filter screens become clogged with material after a period of use, requiring regular cleaning. Current cleaning methods primarily involve using high-pressure air to backflush the filter screen from above, removing powder adhering to the filter element. However, this method only partially removes material particles from the filter screen, and it is difficult to remove already clumped particles. Furthermore, with long-term use, frequent disassembly and cleaning of the filter screen are still necessary.

[0004] Therefore, it is necessary to design a new type of feeding device to improve the cleaning effect of the filter screen. Summary of the Invention

[0005] This invention provides a feeding device for the production of L-dihydrophenylglycine, with the aim of improving the cleaning effect of the filter screen in a vacuum feeder.

[0006] The technical problem solved by the present invention is achieved by the following technical solution: The present invention provides a feeding device for the production of L-dihydrophenylglycine, including a shell, a filter screen installed inside the shell, an air outlet corresponding to the space above the filter screen on the shell, and a feed inlet corresponding to the space below the filter screen;

[0007] The filter screen is made of woven elastic threads;

[0008] A support component is placed on top of the filter screen to keep the filter screen in a stable position as airflow passes through;

[0009] The nut is fixed in the center of the filter screen;

[0010] The screw passes through the center of the nut and is screwed into the nut;

[0011] The motor is fixedly mounted on the top of the housing, and the output shaft of the motor is fixedly connected to the upper end of the screw, thereby driving the screw to rotate;

[0012] After the motor starts, the rotating screw can move the nut downward, thereby pulling the filter screen downward. This causes the elastic threads that make up the filter screen to stretch. After stretching, the clumps of material loosen from the filter screen, making them easier to be blown off by the backflow.

[0013] As a preferred option, the support body is conical in shape, and in use, the filter screen adheres to the lower surface of the support body under its own elasticity.

[0014] As a preferred embodiment, in its natural state, the filter screen is woven into a three-dimensional cone shape, and the taper is the same as that of the support.

[0015] As a preferred embodiment, the nut is provided with a guide pin on its side, which is inserted into the helical groove at the lower end of the screw, thereby realizing the helical connection between the nut and the screw.

[0016] As a preferred embodiment, the lower end of the screw is machined with a retraction slit located at the end of the spiral groove. During the rotation of the screw, when the guide pin on the nut slides to the end of the spiral groove, after further sliding, the nut and guide pin will retract to the previous turn of the spiral groove under the elastic restoring force provided by the filter screen. As the screw continues to rotate, the guide pin slides to the end of the spiral groove again, and then retracts to the previous turn of the spiral groove again. This process repeats, converting the rotational motion of the screw into the vertical vibration of the nut. The vertical vibration makes it easier for the material attached to the filter screen to fall off.

[0017] As a preferred embodiment, the support member is a metal mesh or a perforated metal plate.

[0018] This invention improves upon existing technologies, resulting in the following advantages:

[0019] 1. In this invention, the filter screen is made of elastic fiber. When the filter screen needs to be cleaned, the filter screen is stretched downward under the drive of the motor. After stretching, the clumps of material loosen between the filter screen and the filter screen, making it easier to be blown off by the backflow.

[0020] 2. In this invention, after the filter screen is stretched and tightened, the nut can perform high-frequency vertical vibration under the drive of the motor and screw (high-frequency vibration and airflow backflushing can be carried out simultaneously), thereby making it easy for the material attached to the filter screen to fall off. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the upper part of the present invention.

[0023] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0024] Figure 4 This is a schematic diagram of the structure of the filter screen after it has been stretched.

[0025] In the diagram, 1 is the motor, 2 is the air outlet, 3 is the outer casing, 4 is the feed inlet, 5 is the discharge outlet, 6 is the retraction cut, 7 is the filter screen, 8 is the support component, 9 is the nut, 10 is the guide pin, and 11 is the spiral groove. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] like Figure 1 As shown, this embodiment includes a housing 3, inside which a filter screen 7 is installed. An air outlet 2 is provided on the housing 3 corresponding to the space above the filter screen 7, and a feed inlet 4 is provided on the housing 3 corresponding to the space below the filter screen 7. A discharge outlet 5 is provided at the lower end of the housing 3. This is a conventional structure in the prior art and will not be described in detail here.

[0028] In this embodiment, the filter screen 7 is woven from elastic threads. The woven elastic threads form tiny mesh holes, through which airflow can pass, while particulate material cannot pass, thereby separating the material from the airflow.

[0029] like Figure 2 , 3 As shown, in this embodiment, the support member 8 is supported on the upper side of the filter screen 7. The support member 8 can be made of a high-density metal mesh, a perforated metal plate, or a non-elastic fabric with a skeleton support, thereby keeping the filter screen 7 stable when airflow passes through. At the same time, the dense support can prevent the airflow from stretching the elastic threads in the filter screen 7, thus preventing the mesh of the filter screen 7 from being enlarged by the airflow. Since the airflow comes from the lower side of the filter screen 7, the filter screen 7 only needs to be supported on the upper side.

[0030] like Figure 2 , 3 As shown in Figure 4, in this embodiment, the nut 9 is fixed at the center of the filter screen 7. The nut 9 is disc-shaped, and the filter screen 7 is fixed on the periphery of the disc-shaped structure, which is beneficial for uniformly pulling the filter screen 7.

[0031] like Figure 2 , 3 As shown in Figure 4, in this embodiment, the screw passes through the center of the nut 9 and is helically connected to the nut 9. The rotational motion of the screw can be converted into the linear motion of the nut 9 through the helical connection structure.

[0032] like Figure 1 , 2As shown in Figures 1 and 3, in this embodiment, the motor 1 is fixedly installed on the top of the housing 3, and the output shaft of the motor 1 is fixedly connected to the upper end of the screw, thereby driving the screw to rotate.

[0033] like Figure 3 , 4 As shown, in this embodiment, the support body is conical. In use, the filter screen 7 adheres to the lower surface of the support body under its own elasticity, thus tautning the filter screen 7. Simultaneously, in its natural state, the filter screen 7 is woven into a three-dimensional conical shape, with the same taper as the support body. With this structure, the mesh density of the filter screen 7 is more uniform, and the mesh size is more stable, which helps ensure the filtration effect.

[0034] like Figure 3 As shown, in this embodiment, a guide pin 10 is provided on the side of the nut 9. The guide pin 10 is inserted into the spiral groove 11 at the lower end of the screw, thereby realizing the spiral connection between the nut 9 and the screw. Compared with ordinary spiral connection (i.e., threaded connection), the pitch of this connection method can be made larger, so that the nut 9 and the filter screen 7 respond more quickly to the power of the motor 1.

[0035] like Figure 2 As shown, in this embodiment, the lower end of the screw is machined with a retraction cut 6, which is located at the end of the spiral groove 11.

[0036] Working principle:

[0037] When the filter screen 7 needs cleaning, start the motor 1. The rotating screw can move the nut 9 downward, thereby pulling the filter screen 7 downward and causing the elastic threads that make up the filter screen 7 to stretch. After stretching, the clumps of material loosen from the filter screen 7. At this time, use high-pressure air to blow the filter screen 7 downward from the top side. The clumps on the filter screen 7 are more easily blown off by the back airflow.

[0038] In addition, during the rotation of the screw, when the guide pin 10 on the nut 9 slides to the end of the spiral groove 11, the filter screen 7 is tightened, but does not exceed the limit of elastic deformation. After continuing to slide, the nut 9 and the guide pin 10 will retract to the previous turn of the spiral groove 11 under the action of the elastic restoring force provided by the filter screen 7. The screw continues to rotate, and the guide pin 10 slides to the end of the spiral groove 11 again, and then retracts to the previous turn of the spiral groove 11 again. This process is repeated, so that the rotational motion of the screw is converted into the vertical vibration of the nut 9 (high-frequency vibration and airflow backflushing can be carried out simultaneously). In practice, the speed of the motor 1 can reach hundreds or even thousands of times, that is, hundreds or even thousands of high-frequency vibrations can be generated per minute, which makes the material attached to the filter screen 7 easy to fall off.

Claims

1. A feeding device for the production of L-dihydrophenylglycine, comprising a shell (3), a filter screen (7) installed inside the shell (3), an air outlet (2) corresponding to the space above the filter screen (7) on the shell (3), and a feed inlet (4) corresponding to the space below the filter screen (7), characterized in that: The filter screen (7) is woven from elastic threads; The support (8) is supported on the upper side of the filter (7) to keep the filter (7) stable when airflow passes through; Nut (9) is fixed in the center of filter screen (7); The screw passes through the center of the nut (9) and is screwed to the nut (9); The motor (1) is fixedly installed on the top of the housing (3), and the output shaft of the motor (1) is fixedly connected to the upper end of the screw, thereby driving the screw to rotate; After the motor (1) starts, the rotating screw can move the nut (9) downward, thereby pulling the filter screen (7) downward, causing the elastic threads that make up the filter screen (7) to stretch. After stretching, the clump of material loosens between itself and the filter screen (7), making it easier to be blown off by the backflow. The nut (9) is provided with a guide pin (10) on its side. The guide pin (10) is inserted into the spiral groove (11) at the lower end of the screw, thereby realizing the spiral connection between the nut (9) and the screw.

2. The feeding device for the production of L-dihydrophenylglycine according to claim 1, characterized in that: In its natural state, the filter (7) is woven into a three-dimensional cone shape, and the taper is the same as that of the support member.

3. The feeding device for the production of L-dihydrophenylglycine according to claim 1, characterized in that: The lower end of the screw is machined with a retraction cut (6), which is located at the end of the spiral groove (11). During the rotation of the screw, when the guide pin (10) on the nut (9) slides to the end of the spiral groove (11), after continuing to slide, the nut (9) and the guide pin (10) will retract to the upper turn of the spiral groove (11) under the action of the elastic restoring force provided by the filter screen (7). The screw continues to rotate, and the guide pin (10) slides to the end of the spiral groove (11) again, and then retracts to the upper turn of the spiral groove (11) again. This process is repeated, so that the rotational motion of the screw is converted into the vertical vibration of the nut (9). The vertical vibration makes the material attached to the filter screen (7) easy to fall off.

4. The feeding device for the production of L-dihydrophenylglycine according to claim 1, characterized in that: The support member (8) is a metal mesh or a perforated metal plate.

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