Metering device for phenylhydrazine production and metering method thereof

Abstract

The invention belongs to the technical field of phenylhydrazine production, and discloses a metering device for phenylhydrazine production and a metering method thereof.The metering device comprises a metering tank, a feeding port is formed in the bottom end of the metering tank, the outer side face of the metering tank is fixedly sleeved with a rack, and a quantitative limiting assembly is movably sleeved with the metering tank; the top end of the quantitative limiting assembly is movably clamped with a quantitative adjusting assembly, and the bottom end of the quantitative adjusting assembly is provided with an auxiliary measuring assembly. The quantitative limiting assembly and the quantitative adjusting assembly are matched and utilized, that is, after pre-adjustment is carried out through the quantitative adjusting assembly, the maximum rising distance of the piston plate is limited through buoyancy provided by injected raw materials and the effect of the quantitative adjusting assembly, and the quantitative limiting assembly and the quantitative adjusting assembly are matched and used for limiting the maximum rising distance of the piston plate. According to the device, the overall volume of the metering tank can be adaptively adjusted, the quantitative feeding requirements in different scenes are met, quantitative feeding can be completed without replacing metering tanks of different specifications, and the overall practicability of the device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of phenylhydrazine production, and specifically relates to a metering device for phenylhydrazine production and a metering method thereof. Background Art

[0002] Phenylhydrazine is an important organic chemical widely used in the production of synthetic drugs, dyes, pesticides, and other chemicals. Phenylhydrazine is primarily produced by reacting aniline with hydrogen, typically using catalytic hydrogenation reduction. The specific process involves reacting aniline with hydrogen in the presence of a suitable catalyst (such as nickel, palladium, etc.) to reduce the amino group (–NH2) in the aniline to a hydrazine group (–NHNH2). This reaction typically requires controlled temperature, pressure, and reaction time to ensure product yield and purity. Precise metering of the raw materials is essential during the production process, and metering devices are used for this purpose.

[0003] Conventional metering devices are mainly composed of transparent metering tanks. The raw materials are injected into the inside of the metering tanks and the metering process is realized through the scale on the metering tanks. Although this metering method can achieve certain metering operations, when the volume of the metering tanks is limited and quantitative delivery is required, different metering tanks need to be replaced, and the volume of the metering tanks cannot be adjusted, which makes it insufficiently practical.

[0004] At the same time, the method of measuring by the scale on the metering tank is limited by the injection process of the raw materials. At this time, the liquid surface of the raw materials will shake to a certain extent. At this time, the scale cannot be read. It is necessary to wait until the liquid surface is calm before reading. The overall measurement is relatively cumbersome and cannot achieve fast measurement. Summary of the Invention

[0005] The object of the present invention is to provide a metering device for phenylhydrazine production and a metering method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a metering device for phenylhydrazine production, comprising a metering tank, a feed port being provided at the bottom end of the metering tank, a frame being fixedly sleeved on the outer side of the metering tank, a quantitative limiting component being movably sleeved on the inside of the metering tank, a quantitative adjustment component being movably clamped on the top end of the quantitative limiting component, an auxiliary measuring component being installed at the bottom end of the quantitative adjustment component, the left and right ends of the auxiliary measuring component being connected to the left and right sides of the quantitative limiting component near the top, and one side of the quantitative adjustment component being fixedly connected to the frame;

[0007] The quantitative limiting component changes its state due to the rising liquid level inside the metering tank, and at the same time acts on the auxiliary measuring component and completes the measurement through the auxiliary measuring component. The quantitative adjustment component is used to adjust the maximum stroke on the left and right sides of the quantitative limiting component, and acts on the metering tank to change its maximum volume.

[0008] Before using the device, the bottom end of the feed port must be connected to the raw material injection pipe, and the device must be stably fixed using a frame. At the same time, ensure that there is no residual raw material inside the metering tank, completing the preparation process before raw material injection and metering.

[0009] As a further technical solution of the present invention, the quantitative limiting component includes a piston plate, which is movably connected to the metering tank. An extension rod is fixedly installed on the top of the piston plate, and a first fixed seat is fixedly installed on the left and right sides of the top of the extension rod. The end of the first fixed seat away from the extension rod is movably connected to a connecting rod through a rotating shaft.

[0010] As a further technical solution of the present invention, the end of the connecting rod away from the first fixed seat is movably connected to the second fixed seat through a rotating shaft, and the top of the second fixed seat is fixedly installed with a guide block, which is movably engaged with the quantitative adjustment component.

[0011] The piston plate is made of lightweight material and can float and rise with the rising liquid level. The distance between the bottom end of the piston plate and the bottom end of the inner cavity of the metering tank is the current maximum volume of the metering tank.

[0012] As a further technical solution of the present invention, the quantitative adjustment component includes a limiting guide rail, one side of which is connected to the top of the frame, and locking rings are fixedly installed on the left and right sides of the bottom end of the limiting guide rail, and the locking rings are fixedly connected to the auxiliary measurement component.

[0013] As a further technical solution of the present invention, the left and right sides of the inner cavity of the limiting guide rail are movably connected to the guide block, a bidirectional screw rod is provided above the limiting guide rail, and a turning handle is fixedly sleeved in the middle of the bidirectional screw rod.

[0014] As a further technical solution of the present invention, a locking frame is fixedly installed in the middle of the top end of the limiting guide rail, and the locking frame is movably connected to the turning handle, and the turning handle rotates relative to the locking frame.

[0015] As a further technical solution of the present invention, the left and right sides of the inner cavity of the limiting guide rail are movably connected with a blocking seat located on the outer side of the guide block, and the blocking seat is threadedly connected to the outer side surface of the bidirectional screw rod. The thread direction on the left and right sides of the bidirectional screw rod is the same as the direction of the thread groove inside the corresponding blocking seat.

[0016] When quantitative feeding is carried out, the quantitative adjustment component needs to be adjusted according to the quantitative feeding amount. That is, by rotating the handle, the bidirectional screw rod can be driven to rotate. At this time, the left and right blocking seats will move closer or farther away from each other. When the distance between the two blocking seats is adjusted to the specified position, the adjustment of the quantitative adjustment component and the preparation work before filling can be completed.

[0017] At this time, the raw materials are injected into the metering tank through the feed port, and as the raw materials are injected, the liquid level inside the metering tank rises, the buoyancy of the piston plate increases, and drives the extension rod to move upward. At this time, the connecting rod deflects, that is, it deflects away from the middle, and applies thrust to the two guide blocks, and the two guide blocks move away from each other until a collision occurs between the guide blocks and the blocking seat, at which time the limit is completed, and the quantitative weighing process is completed.

[0018] By utilizing the coordination between the quantitative limiting component and the quantitative adjustment component, that is, after pre-adjustment through the quantitative adjustment component, the maximum rising distance of the piston plate is limited by the buoyancy provided by the injected raw material and the action of the quantitative adjustment component, the device can adaptively adjust the overall volume of the metering tank to meet the quantitative delivery requirements in different scenarios. Quantitative delivery can be completed without replacing metering tanks of different specifications, thereby improving the overall practicality of the device.

[0019] As a further technical solution of the present invention, the auxiliary measuring component includes a measuring glass tube, the outer side surface of the measuring glass tube is fixedly sleeved with a locking ring, and the left and right sides of the inner cavity of the measuring glass tube are movably sleeved with limit plates, and the ends of the two limit plates away from each other are fixedly installed with limit rods, and the end of the limit rod away from the limit plate passes through one side of the measuring glass tube and is connected to the blocking seat.

[0020] As a further technical solution of the present invention, a bend is fixedly connected to one side of the middle of the measuring glass tube, and an end of the bend away from the measuring glass tube is fixedly connected to an oil storage tank. The outer side of the oil storage tank is connected to the limiting guide rail through a mounting frame. The interior of the oil storage tank is filled with a colored indicator liquid and a scale is provided on the outer side of the oil storage tank.

[0021] When injecting raw materials, the two guide blocks move away from each other, which can drive the two limit rods to move away from each other. At this time, the two limit plates move away from each other, and negative pressure is generated inside the measuring glass tube. At the same time, the colored indicator liquid inside the oil storage tank falls freely due to gravity and enters the interior of the measuring glass tube, filling the position between the two limit plates. As the piston plate rises, the indicator liquid inside the oil storage tank decreases. At this time, the raw material inside the metering tank can be measured by reading the scale outside the oil storage tank, completing the metering process.

[0022] By utilizing the cooperation between the quantitative limiting component and the auxiliary measuring component, the device can change the distance between the two limit plates by changing the height of the piston plate when injecting raw materials, and use the flow of the indicator liquid to perform indirect readings. Since direct reading is not used, the entire metering process is not affected by liquid surface shaking, which can avoid the problems of long measurement time and inaccurate measurement caused by liquid surface shaking, and significantly improve the metering accuracy.

[0023] A metering method for a metering device for phenylhydrazine production, comprising the following steps:

[0024] S1: Before metering, turn the handle according to the quantitative requirements, causing the bidirectional screw to rotate accordingly. At this time, the distance between the left and right blocking seats is adjusted. When the blocking seats are adjusted to the appropriate position, the quantitative adjustment process is completed;

[0025] S2: The raw material is injected through the feed port. At this time, the raw material rises inside the metering tank. As the liquid level increases, the piston plate rises and drives the extension rod to rise. At this time, the connecting rod deflects and drives the two guide blocks to move away from each other until the guide blocks are blocked by the blocking seat, completing the quantitative injection process.

[0026] S3: When the two guide blocks move away from each other, the two limit rods move away from each other. At this time, the two limit plates move away from each other, and the indicating liquid inside the oil storage tank enters the inside of the measuring glass tube. The indicating liquid inside the oil storage tank decreases accordingly. At this time, the raw materials inside the metering tank can be measured through the scale.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) The present invention utilizes the coordination between the quantitative limiting component and the quantitative adjusting component, that is, after pre-adjustment by the quantitative adjusting component, the maximum rising distance of the piston plate is limited by the buoyancy provided by the injected raw material and the action of the quantitative adjusting component, so that the device can adaptively adjust the overall volume of the metering tank to meet the quantitative delivery requirements in different scenarios. Quantitative delivery can be completed without replacing metering tanks of different specifications, thereby improving the overall practicality of the device.

[0029] (2) The present invention utilizes the cooperation between the quantitative limiting component and the auxiliary measuring component, so that when the device injects the raw material, the height change of the piston plate can change the distance between the two limit plates, and the flow of the indicator liquid can be used for indirect reading. Since direct reading is not adopted, the entire metering process is not affected by the liquid surface shaking, which can avoid the problems of long measurement time and inaccurate measurement caused by liquid surface shaking, and significantly improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the coordination between the metering tank and the rack structure of the present invention;

[0032] Figure 3 It is a cross-sectional schematic diagram of the internal structure of the metering tank of the present invention;

[0033] Figure 4 This is a schematic diagram of the coordination of the quantitative limiting component, the quantitative adjustment component, and the auxiliary measurement component structure of the present invention;

[0034] Figure 5 A separate schematic diagram of the quantitative restriction module structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the decomposition of the quantitative adjustment component structure of the present invention;

[0036] Figure 7 It is a partial cross-sectional schematic diagram of the auxiliary measurement component structure of the present invention.

[0037] In the figure: 1. Measuring tank; 2. Frame; 3. Feed port; 4. Quantitative limiting assembly; 401. Piston plate; 402. Extension rod; 403. First fixed seat; 404. Second fixed seat; 405. Connecting rod; 406. Guide block; 5. Quantitative adjustment assembly; 501. Limiting guide rail; 502. Locking ring; 503. Locking frame; 504. Turning handle; 505. Bidirectional screw; 506. Blocking seat; 6. Auxiliary measuring assembly; 601. Measuring glass tube; 602. Limiting plate; 603. Limiting rod; 604. Oil storage tank; 605. Bend pipe. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] like Figures 1 to 7 As shown, in an embodiment of the present invention, a metering device for phenylhydrazine production includes a metering tank 1, a feed port 3 is opened at the bottom end of the metering tank 1, a frame 2 is fixedly sleeved on the outer side of the metering tank 1, a quantitative limiting component 4 is movably sleeved inside the metering tank 1, a quantitative adjustment component 5 is movably connected to the top of the quantitative limiting component 4, an auxiliary measuring component 6 is installed at the bottom end of the quantitative adjustment component 5, the left and right ends of the auxiliary measuring component 6 are connected to the left and right sides near the top of the quantitative limiting component 4, and one side of the quantitative adjustment component 5 is fixedly connected to the frame 2;

[0040] The quantitative limiting component 4 changes its state due to the rising liquid level inside the metering tank 1, and at the same time acts on the auxiliary measuring component 6 and completes the measurement through the auxiliary measuring component 6. The quantitative adjustment component 5 is used to adjust the maximum stroke on the left and right sides of the quantitative limiting component 4, and acts on the metering tank 1 to change its maximum volume.

[0041] Before using the device, the bottom end of the feed port 3 needs to be connected to the raw material injection pipe, and the device needs to be stably fixed using the frame 2. At the same time, ensure that there is no residual raw material inside the metering tank 1, completing the preparation process before raw material injection and metering.

[0042] like Figure 1 and Figure 4 as well as Figure 5 As shown, the quantitative limiting component 4 includes a piston plate 401, which is movably connected to the metering tank 1. An extension rod 402 is fixedly installed on the top of the piston plate 401, and a first fixed seat 403 is fixedly installed on the left and right sides of the top of the extension rod 402. The end of the first fixed seat 403 away from the extension rod 402 is movably connected to a connecting rod 405 through a rotating shaft, and the end of the connecting rod 405 away from the first fixed seat 403 is movably connected to a second fixed seat 404 through a rotating shaft. A guide block 406 is fixedly installed on the top of the second fixed seat 404, and the guide block 406 is movably connected to the quantitative adjustment component 5.

[0043] The piston plate 401 is made of lightweight material and can float and rise with the rising liquid level. The distance between the bottom end of the piston plate 401 and the bottom end of the inner cavity of the metering tank 1 is the current maximum volume of the metering tank 1.

[0044] like Figure 1 and Figure 4 as well as Figure 6 As shown, the quantitative adjustment component 5 includes a limit guide rail 501, one side of the limit guide rail 501 is connected to the top of the frame 2, and the left and right sides of the bottom end of the limit guide rail 501 are fixedly installed with a locking ring 502, the locking ring 502 is fixedly sleeved with the auxiliary measurement component 6, and the left and right sides of the inner cavity of the limit guide rail 501 are movably connected with the guide block 406. A two-way screw rod 505 is provided above the limit guide rail 501, and a turning handle 504 is fixedly sleeved in the middle of the two-way screw rod 505. A locking frame 503 is fixedly installed in the middle of the top of the positioning guide rail 501, and the locking frame 503 is movably connected to the turning handle 504. The turning handle 504 rotates relative to the locking frame 503. The left and right sides of the inner cavity of the limiting guide rail 501 are movably connected with the blocking seat 506 located on the outer side of the guide block 406. The blocking seat 506 is threadedly connected to the outer side surface of the bidirectional screw rod 505, and the thread direction on the left and right sides of the bidirectional screw rod 505 is the same as the direction of the corresponding thread groove inside the blocking seat 506.

[0045] Example: When quantitative feeding is performed, the quantitative adjustment component 5 needs to be adjusted according to the quantitative feeding amount. That is, the bidirectional screw rod 505 can be driven to rotate by rotating the handle 504. At this time, the left and right blocking seats 506 will move closer or farther away from each other. When the distance between the two blocking seats 506 is adjusted to the specified position, the adjustment of the quantitative adjustment component 5 and the preparation work before filling are completed.

[0046] At this time, raw materials are injected into the interior of the metering tank 1 through the feed port 3, and as the raw materials are injected, the liquid level inside the metering tank 1 rises, the buoyancy of the piston plate 401 increases, and drives the extension rod 402 to move upward. At this time, the connecting rod 405 deflects, that is, deflects in the direction away from the middle, and applies thrust to the two guide blocks 406, and the two guide blocks 406 move away from each other until a collision occurs between the guide blocks 406 and the blocking seat 506, at which time the limit is completed, and the quantitative weighing process is completed.

[0047] By utilizing the cooperation between the quantitative limiting component 4 and the quantitative adjustment component 5, that is, after pre-adjustment by the quantitative adjustment component 5, the maximum rising distance of the piston plate 401 is limited by the buoyancy provided by the injected raw material and the action of the quantitative adjustment component 5, the device can adaptively adjust the overall volume of the metering tank 1 to meet the quantitative delivery requirements in different scenarios. Quantitative delivery can be completed without replacing metering tanks 1 of different specifications, thereby improving the overall practicality of the device.

[0048] like Figure 1 and Figure 4 as well as Figure 7 As shown, the auxiliary measuring component 6 includes a measuring glass tube 601, the outer side surface of the measuring glass tube 601 is fixedly sleeved with the locking ring 502, and the left and right sides of the inner cavity of the measuring glass tube 601 are movably sleeved with limit plates 602, and the ends of the two limit plates 602 away from each other are fixedly installed with limit rods 603, and the end of the limit rod 603 away from the limit plate 602 passes through one side of the measuring glass tube 601 and is connected to the blocking seat 506. One side of the middle part of the measuring glass tube 601 is fixedly connected with a bend pipe 605, and the end of the bend pipe 605 away from the measuring glass tube 601 is fixedly connected with an oil storage tank 604, and the outer side surface of the oil storage tank 604 is connected to the limit guide rail 501 through a mounting frame. The interior of the oil storage tank 604 is filled with colored indicator liquid and the outer side surface of the oil storage tank 604 is provided with a scale.

[0049] Embodiment: When the raw materials are injected, the two guide blocks 406 move away from each other, and the two limit rods 603 can be driven away from each other at the same time. At this time, the two limit plates 602 also move away from each other, and then a negative pressure is generated inside the measuring glass tube 601. At the same time, the colored indicator liquid inside the oil storage tank 604 falls freely due to gravity, and enters the interior of the measuring glass tube 601, filling the position between the two limit plates 602. As the piston plate 401 rises, the indicator liquid inside the oil storage tank 604 decreases. At this time, the raw material inside the metering tank 1 can be measured by reading the scale outside the oil storage tank 604, completing the metering process.

[0050] By utilizing the cooperation between the quantitative limiting component 4 and the auxiliary measuring component 6, when the device injects raw materials, the height change of the piston plate 401 can change the distance between the two limit plates 602, and the flow of the indicator liquid can be used for indirect reading. Since direct reading is not adopted, the entire metering process is not affected by the liquid surface shaking, which can avoid the problems of long measurement time and inaccurate measurement caused by liquid surface shaking, and significantly improve the metering accuracy.

[0051] A metering method for a metering device for phenylhydrazine production, comprising the following steps:

[0052] S1: Before metering, the handle 504 is rotated according to the quantitative requirements, so that the bidirectional screw rod 505 rotates accordingly. At this time, the distance between the left and right blocking seats 506 is adjusted. When the blocking seats 506 are adjusted to the appropriate position, the quantitative adjustment process is completed;

[0053] S2: The raw material is injected through the feed port 3. At this time, the raw material rises inside the metering tank 1. As the liquid level increases, the piston plate 401 rises and drives the extension rod 402 to rise. At this time, the connecting rod 405 deflects and drives the two guide blocks 406 to move relatively away from each other until the guide blocks 406 are blocked by the blocking seat 506. The quantitative injection process is completed.

[0054] S3: When the two guide blocks 406 move away from each other, the two limit rods 603 move away from each other. At this time, the two limit plates 602 move away from each other, and the indicator liquid inside the oil storage tank 604 enters the inside of the measuring glass tube 601. The indicator liquid inside the oil storage tank 604 decreases accordingly. At this time, the raw materials inside the measuring tank 1 can be measured through the scale.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A metering device for phenylhydrazine production, comprising a metering tank (1), characterized in that: The bottom end of the metering tank (1) is provided with a feed port (3), the outer side surface of the metering tank (1) is fixedly sleeved with a frame (2), the interior of the metering tank (1) is movably sleeved with a quantitative limiting component (4), the top end of the quantitative limiting component (4) is movably clamped with a quantitative adjustment component (5), the bottom end of the quantitative adjustment component (5) is installed with an auxiliary measurement component (6), the left and right ends of the auxiliary measurement component (6) are connected to the left and right sides of the quantitative limiting component (4) near the top, and one side of the quantitative adjustment component (5) is fixedly connected to the frame (2); The quantitative limiting component (4) changes its state due to the rising liquid level inside the metering tank (1), and simultaneously acts on the auxiliary measuring component (6) and completes the measurement through the auxiliary measuring component (6). The quantitative adjustment component (5) is used to adjust the maximum strokes on the left and right sides of the quantitative limiting component (4), and acts on the metering tank (1) to change its maximum volume.

2. A metering device for producing phenylhydrazine according to claim 1, characterized in that: The quantitative limiting component (4) includes a piston plate (401), which is movably connected to the metering tank (1), and an extension rod (402) is fixedly installed on the top of the piston plate (401). First fixing seats (403) are fixedly installed on the left and right sides of the top of the extension rod (402), and the end of the first fixing seat (403) away from the extension rod (402) is movably connected to a connecting rod (405) via a rotating shaft.

3. A metering device for producing phenylhydrazine according to claim 2, characterized in that: The end of the connecting rod (405) away from the first fixed seat (403) is movably connected to the second fixed seat (404) via a rotating shaft, and the top of the second fixed seat (404) is fixedly installed with a guide block (406), and the guide block (406) is movably connected to the quantitative adjustment component (5).

4. A metering device for phenylhydrazine production according to claim 3, characterized in that: The quantitative adjustment component (5) comprises a limiting guide rail (501), one side of the limiting guide rail (501) is connected to the top of the frame (2), and locking rings (502) are fixedly installed on both the left and right sides of the bottom end of the limiting guide rail (501), and the locking rings (502) are fixedly sleeved with the auxiliary measurement component (6).

5. A metering device for producing phenylhydrazine according to claim 4, characterized in that: The left and right sides of the inner cavity of the limiting guide rail (501) are movably connected to the guide block (406), and a bidirectional screw rod (505) is provided above the limiting guide rail (501), and a turning handle (504) is fixedly sleeved in the middle of the bidirectional screw rod (505).

6. A metering device for phenylhydrazine production according to claim 5, characterized in that: A locking frame (503) is fixedly mounted in the middle of the top end of the position-limiting guide rail (501), and the locking frame (503) is movably sleeved with the turning handle (504), and the turning handle (504) rotates relative to the locking frame (503).

7. A metering device for phenylhydrazine production according to claim 6, characterized in that: The left and right sides of the inner cavity of the position-limiting guide rail (501) are movably connected with a blocking seat (506) located on the outer side of the guide block (406), and the blocking seat (506) is threadedly connected to the outer side surface of the bidirectional screw rod (505). The thread direction of the left and right sides of the bidirectional screw rod (505) is the same as the direction of the thread groove inside the corresponding blocking seat (506).

8. A metering device for phenylhydrazine production according to claim 7, characterized in that: The auxiliary measuring assembly (6) comprises a measuring glass tube (601), the outer side surface of the measuring glass tube (601) is fixedly sleeved with a locking ring (502), the left and right sides of the inner cavity of the measuring glass tube (601) are movably sleeved with limit plates (602), and the ends of the two limit plates (602) that are away from each other are fixedly mounted with limit rods (603), and the end of the limit rod (603) that is away from the limit plate (602) passes through one side of the measuring glass tube (601) and is connected to the blocking seat (506).

9. A metering device for phenylhydrazine production according to claim 8, characterized in that: A curved tube (605) is fixedly connected to one side of the middle of the measuring glass tube (601), and an end of the curved tube (605) away from the measuring glass tube (601) is fixedly connected to an oil storage tank (604). The outer side of the oil storage tank (604) is connected to the limiting guide rail (501) via a mounting frame. The interior of the oil storage tank (604) is filled with a colored indicator liquid, and a scale is provided on the outer side of the oil storage tank (604).

10. The metering method of a metering device for phenylhydrazine production according to claim 9, characterized in that: The following steps are involved: S1: Before metering, the handle (504) is rotated according to the quantitative requirements, so that the bidirectional screw (505) rotates accordingly. At this time, the distance between the left and right blocking seats (506) is adjusted. When the blocking seats (506) are adjusted to the appropriate position, the quantitative adjustment process is completed; S2: The raw material is injected through the feed port (3). At this time, the raw material rises inside the metering tank (1). As the liquid level increases, the piston plate (401) rises and drives the extension rod (402) to rise. At this time, the connecting rod (405) deflects and drives the two guide blocks (406) to move relatively away from each other until the guide block (406) is blocked by the blocking seat (506). The quantitative injection process is completed. S3: When the two guide blocks (406) move away from each other, the two limit rods (603) move away from each other. At this time, the two limit plates (602) move away from each other, and the indicator liquid inside the oil storage tank (604) enters the inside of the measuring glass tube (601). The indicator liquid inside the oil storage tank (604) decreases accordingly. At this time, the raw material inside the measuring tank (1) can be measured through the scale.

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