Sampling mechanism of diethyl allylmalonate production reaction kettle

Abstract

A sampling mechanism of an allyl diethyl malonate production reaction kettle relates to the technical field of reaction kettle sampling and comprises a reaction kettle body, a supporting L-shaped plate is fixedly arranged on the upper outer wall of the reaction kettle body, a horizontally-arranged fixing pipe is fixedly arranged at the end of the supporting L-shaped plate, rotating cylinders are coaxially arranged on the two sides of the fixing pipe in a rotating mode, and the rotating cylinders are coaxially arranged on the upper outer wall of the reaction kettle body. The opening ends of the two rotating cylinders are oppositely arranged, the opening ends of the two rotating cylinders respectively extend into two ports of the fixed pipe and are rotatably and hermetically connected with the fixed pipe, pressure control circular plates which are slidably and hermetically connected with the rotating cylinders are coaxially arranged in the rotating cylinders, and horizontally arranged control telescopic cylinders are fixedly arranged on the inner walls of the rotating cylinders. The reaction kettle sampling device for diethyl allymalonate production solves the problems that during sampling, normal reaction is affected, materials are prone to being polluted, and the sampling procedure is tedious in an existing reaction kettle sampling device for diethyl allymalonate production. The sampling process is low in convenience and long in sampling period; safety risks exist in the sampling process. And the sampling materials are wasted.

Description

Technical Field

[0001] The invention relates to the technical field of reactor sampling, in particular to a sampling mechanism for a reactor for producing diethyl allyl malonate. Background Art

[0002] Diethyl allylmalonate is an organic compound, a colorless liquid with a weak ethereal odor. Diethyl allylmalonate can be used as a solvent for paints, inks, and varnishes. Diethyl allylmalonate is usually prepared by reacting diethyl acrylate with propylene anhydride.

[0003] The preparation of diethyl allyl malonate needs to be carried out in a reactor. In order to better view the reaction status of the materials in the reactor, sampling and testing are required during the reaction.

[0004] The existing sampling device for the reactor of diethyl allyl malonate production gradually exposed its shortcomings during use, which are mainly manifested in the following aspects: First, sampling requires destroying the original reaction environment in the reactor, which affects the normal progress of the reaction. In addition, the materials in the reactor are easily contaminated during the sampling process, which affects the purity of the product. In addition, the sampling process is cumbersome. Specifically, the interior of the reactor is a high-temperature and high-pressure environment during the chemical reaction. High temperature and high pressure can increase the rate and selectivity of the chemical reaction and optimize the reaction conditions. When sampling the materials in the reactor, the reactor needs to be depressurized. After the internal air pressure of the reactor drops to normal pressure, the reactor is opened and the material is sampled using a sampling device. Therefore, when sampling the materials, the original high-pressure environment in the reactor needs to be destroyed, which in turn affects the normal progress of the reaction. In the process of sampling the materials, external air will enter the reactor through the valve port, and the materials in the reactor react with the air to produce impurities, which in turn affects the purity of the product. Moreover, after the material sampling is completed, the reactor needs to be pressurized. The depressurization and pressurization operations increase the operating procedures of the sampling process, resulting in a cumbersome sampling process.

[0005] Second, the sampling process is inconvenient and the sampling cycle is long. Specifically, as mentioned in the first question point, the interior of the reactor is a high-temperature and high-pressure environment. After the reactor is depressurized, the material inside still has a relatively high temperature. The staff need to wear heat-insulating tools and take protective measures when using the sampling device to take samples and transfer the materials in the sampling device to the test tube. Therefore, the staff's operations during the sampling process are easily restricted by the heat-insulating tools, resulting in the sampling process being inconvenient. After the sampled materials are transferred to the test tube, they need to stand at room temperature, and it takes a long time for the materials to completely cool down, resulting in a long sampling cycle.

[0006] Third, materials are prone to leakage during the sampling process, which not only causes waste of materials but also poses safety risks. Specifically, diethyl acrylate in the material has high volatility. When the valve port of the reactor is opened for sampling, diethyl acrylate evaporates to the outside through the valve port, thus causing waste. In addition, diethyl acrylate is toxic and can be easily inhaled by staff when it evaporates to the external environment, thus posing a safety risk.

[0007] Fourth, the sampling dosage is not controlled during the sampling process, resulting in the waste of excess sampling materials. Specifically, when sampling materials, in order to avoid multiple sampling due to insufficient sampling dosage, the staff measures the material far in excess of the required amount, and the excess sampling materials are easily contaminated in the external environment. In order to prevent the contaminated sampling materials from being added to the reactor again and causing contamination of the materials in the reactor, the staff usually handles the excess sampling materials, which leads to the waste of this part of the materials.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0009] In view of the defects in the prior art, the technical problem to be solved by the present invention is to provide a sampling mechanism for a reactor for producing diethyl allyl malonate, wherein the device can realize sampling without releasing the pressure of the reactor, and the sampling process does not affect the normal progress of the reaction in the reactor. During the sampling process, the material in the reactor does not contact the external environment, which effectively prevents the material in the reactor from being contaminated. When the device samples the material, the reactor does not need to release or increase the pressure, which simplifies the sampling process. The device can also significantly reduce the number of operations performed by staff during the sampling process, and the staff does not need to wear heat-insulating tools during the operation, which improves the convenience of the sampling process. The device can quickly cool the material during the sampling process, significantly shortening the sampling cycle. The device does not have the problem of material leakage during the sampling process, which reduces material waste and improves the safety of the sampling process; The device can prevent the sampled material from being contaminated during the sampling process, and the excess sampled material can be added into the reactor again, thus reducing the waste of the sampled material.

[0010] To solve the above problems, the present invention provides the following technical solutions: A sampling mechanism for a reactor for producing diethyl allyl malonate comprises a reactor body, an upper outer wall of the reactor body is fixedly provided with a supporting L-shaped plate, an end of the supporting L-shaped plate is fixedly provided with a horizontally arranged fixed tube, both sides of the fixed tube are coaxially provided with a rotatable rotating cylinder, the open ends of the two rotating cylinders are arranged facing each other, the open ends of the two rotating cylinders respectively extend into two ports of the fixed tube and are rotatably sealed and connected to the fixed tube, a pressure control circular plate is coaxially provided in the rotating cylinder and is connected to the fixed tube in a sliding seal, a horizontally arranged control telescopic cylinder is fixedly provided on the inner wall of the rotating cylinder, the telescopic end of the control telescopic cylinder is fixedly connected to the pressure control circular plate, a constant pressure hole is penetrated at the end of the rotating cylinder, the outer wall of the rotating cylinder is covered with a cooling assembly, and a pressure gauge for monitoring the internal pressure of the fixed tube is fixedly provided on the outer wall of the fixed tube. A fixed cylinder with an open end downwardly arranged is fixedly provided on the top of the reactor body, and a sample transfer component for transferring materials is arranged in the fixed cylinder; a vertically arranged external liquid pipe and external ventilation pipe are arranged at a position located in the fixed cylinder at the top of the reactor body; the lower ends of the external liquid pipe and the external ventilation pipe are both sealed, and the upper ends of the external liquid pipe and the external ventilation pipe extend upward through the reactor body into the fixed cylinder; the external liquid pipe and the external ventilation pipe are both rotatably sealed and connected with the reactor body, and the external liquid pipe and the external ventilation pipe are synchronously rotated, and the internal parts of the external liquid pipe and the external ventilation pipe are coaxially fixed with an internal liquid pipe and an internal ventilation pipe, respectively, and the internal liquid pipe and the internal ventilation pipe correspond to the rotation of the external liquid pipe and the external ventilation pipe Dynamic sealing connection, the lower ends of the inner liquid tube and the inner ventilation tube are both sealed and frictionally abutted against the inner bottoms of the outer liquid tube and the outer ventilation tube, the upper end of the inner liquid tube extends upward into the fixed cylinder and is fixedly connected to the sample transfer component, the upper end of the inner ventilation tube extends upward into the fixed cylinder and passes through the fixed cylinder to be connected to the inner cavity of the fixed tube, the inner ventilation tube is fixedly connected to the fixed cylinder, the lower outer walls of the outer liquid tube and the inner liquid tube are respectively penetrated with an outer liquid hole and an inner liquid hole, the lower outer wall of the outer ventilation tube is circumferentially provided with two outer ventilation holes, the lower outer wall of the inner ventilation tube is penetrated with an inner ventilation hole, when the inner liquid hole overlaps with the outer liquid hole, the inner ventilation hole overlaps with one of the outer ventilation holes, A connecting pipe connected to its inner cavity is fixedly provided on the lower outer wall of the fixed tube, a transition pipe connected to the sample transfer assembly is provided in the fixed cylinder, one end of the transition pipe extends to the outside through the fixed cylinder, a fixed drainage pipe is vertically penetrated through the top of the supporting L-shaped plate, a three-way valve is provided above the supporting L-shaped plate, and the three ports of the three-way valve are correspondingly connected to the connecting pipe, the transition pipe and the drainage pipe.

[0011] As an optimized solution, the sample transfer assembly includes a liquid extraction cylinder vertically fixed to the top of the fixed cylinder, the bottom of the liquid extraction cylinder is opened and extends downward through the fixed cylinder to the inside, an upper rotating circular plate is coaxially arranged in the lower port of the liquid extraction cylinder and is connected to the upper rotating circular plate with a rotatable seal therewith, a supporting circular plate is fixedly arranged in the fixed cylinder and is coaxially arranged with the liquid extraction cylinder, a circular groove is coaxially arranged on the top of the supporting circular plate, a lower rotating circular plate is coaxially arranged in the circular groove and is connected to the inner wall of the supporting circular plate with a rotatable seal therewith, the lower rotating circular plate is frictionally abutted against the bottom of the circular groove, two upper through holes are uniformly distributed along the circumferential direction on the top of the lower rotating circular plate, two lower through holes are uniformly distributed along the circumferential direction on the bottom of the circular groove, and the bottom of the upper rotating circular plate is fixed Two connecting tubes connected to the inner cavity of the liquid extraction cylinder are provided, and the lower ends of the two connecting tubes are fixedly connected to the lower rotating circular plate and correspondingly connected to the two upper through holes. The two connecting tubes are respectively provided with a liquid inlet check valve and a liquid outlet check valve. The upper end of the inner liquid connecting tube is fixedly connected to the bottom of the supporting circular plate and connected to one of the lower through holes, and one end of the transition tube is fixedly connected to the bottom of the supporting circular plate and connected to the other lower through hole. A liquid extraction circular plate connected to the upper rotating circular plate is coaxially provided inside the liquid extraction cylinder and slidingly sealed therewith. A vertically arranged electrically controlled telescopic cylinder is fixedly provided on the inner top of the liquid extraction cylinder, and the telescopic end of the electrically controlled telescopic cylinder is fixedly connected to the liquid extraction circular plate. A constant pressure groove is provided through the top of the liquid extraction cylinder.

[0012] As an optimized solution, the cooling assembly includes a cooling pipe sleeved on the outer wall of the rotating cylinder, the cooling pipe is fixedly connected to the end of the supporting L-shaped plate, the rotating cylinder is rotatably connected to the cooling pipe, an annular cooling groove is provided inside the cooling pipe, and a water inlet pipe and a water outlet pipe connected to both ends of the annular cooling groove are fixedly provided on the outer wall of the cooling pipe, and one of the ports of the water inlet pipe and the water outlet pipe passes through the supporting L-shaped plate and is connected to an external circulating cold water source.

[0013] As an optimized solution, the outer wall of the rotating cylinder is fixedly sleeved with a driven gear, and the end of the supporting L-shaped plate is fixedly provided with two vertically arranged limit plates, and a transmission shaft arranged to rotate along a horizontal line is provided between the two limit plates, and the two ends of the transmission shaft are correspondingly connected to the two limit plates for rotation, and the outer wall of the transmission shaft is fixedly sleeved with two driving gears, and the two driving gears are correspondingly meshed with two driven gears.

[0014] As an optimized solution, a driving motor is fixedly provided at the end of one of the limit plates, and the output end of the driving motor passes through the limit plate and is fixedly connected to the transmission shaft.

[0015] As an optimized solution, the outer walls of the external liquid pipe and the external air pipe are located in the fixed cylinder and are respectively fixed with a direction adjustment gear and a transition gear, the direction adjustment gear is meshed with the transition gear, and the top of the reactor body is located in the fixed cylinder and is rotatably provided with a driving gear that meshes with the transition gear.

[0016] As an optimized solution, a driving shaft rotatable along a plumb line is provided at the top of the reactor body located inside the fixed cylinder, the driving gear is fixedly sleeved on the driving shaft, a servo motor is fixedly provided on the top of the fixed cylinder, and the output end of the servo motor passes through the fixed cylinder and is fixedly connected to the driving shaft.

[0017] As an optimized solution, the top of the reactor body is located in a fixed cylinder and is rotatably provided with a rotating shaft coaxially arranged with the supporting circular plate. The top of the rotating shaft passes upward through the supporting circular plate and the lower rotating circular plate and is fixedly connected to the upper rotating circular plate. The lower rotating circular plate is fixedly connected to the rotating shaft, and the supporting circular plate is rotatably connected to the rotating shaft.

[0018] As an optimized solution, a driving rod arranged to rotate along a plumb line is provided at a position on the top of the reactor body located inside the fixed cylinder, a driving wheel is fixedly mounted on the outer wall of the driving rod, a driven wheel is fixedly mounted on the lower outer wall of the rotating shaft, and the driving wheel is connected to the driven wheel through a transmission belt.

[0019] As an optimized solution, a control motor is fixedly provided on the top of the fixed cylinder, and the output end of the control motor passes through the fixed cylinder and is fixedly connected to the driving rod.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. When sampling the material in the reactor body, the three-way valve is adjusted to connect the connecting pipe with the transition pipe, the servo motor drives the driving shaft to rotate, and then drives the driving gear, the transition gear and the direction adjustment gear to rotate, thereby driving the external liquid pipe and the external ventilation pipe to rotate until the internal ventilation hole overlaps with one of the external ventilation holes. At this time, the external liquid hole and the internal liquid hole do not overlap, the interior of the reactor body is connected with the interior of the fixed pipe, and the interior of the reactor body and the interior of the fixed pipe are at the same pressure. The servo motor drives the external ventilation pipe to rotate until the internal ventilation hole overlaps with another external ventilation hole. At this time, the external liquid hole and the internal liquid hole overlap, the electric-controlled telescopic cylinder drives the liquid extraction circular plate to slide upward, and the material in the internal liquid pipe enters the liquid extraction cylinder in one direction through the lower through hole, the upper through hole, the liquid inlet one-way valve and the connecting pipe, and the electric-controlled telescopic cylinder drives the liquid extraction circular plate to slide downward, and the material in the liquid extraction cylinder enters the liquid extraction cylinder in one direction through the connecting pipe, the liquid outlet one-way valve, the upper through hole, the lower through hole, the transition pipe and the connecting pipe After entering the fixed tube and extracting a certain amount of material, the servo motor drives the external liquid pipe and the external air pipe to reset, controls the telescopic end of the telescopic cylinder to contract, and the two pressure-controlled circular plates slide back to back. The air pressure in the closed space formed by the fixed tube and the two rotating cylinders decreases until it decreases to normal pressure. The staff puts the test tube on the lower port of the discharge pipe, adjusts the three-way valve to connect the connecting pipe with the discharge pipe, controls the extension of the telescopic end of the telescopic cylinder, and under the pressure of the pressure-controlled circular plate, the material in the fixed tube enters the test tube through the connecting pipe and the discharge pipe until the sampling is completed. The device can realize sampling without releasing the pressure on the reactor body, and the sampling process does not affect the normal reaction in the reactor body. During the sampling process, the material in the reactor body does not contact the external environment, which effectively prevents the material in the reactor body from being contaminated. When the device samples the material, the reactor body does not need to release or increase the pressure, which simplifies the sampling process. 2. After sampling, the three-way valve is adjusted to connect the connecting pipe with the transition pipe, the telescopic cylinder is controlled to drive the pressure control circular plate to reset, the servo motor drives the external ventilation pipe to rotate again until the inner ventilation hole overlaps with one of the outer ventilation holes, at this time the outer liquid hole and the inner liquid hole do not overlap, the interior of the reactor body is connected with the interior of the fixed pipe, the interior of the reactor body and the interior of the fixed pipe are under the same pressure again, the servo motor drives the external ventilation pipe to rotate until the inner ventilation hole overlaps with another outer ventilation hole, at this time the outer liquid hole and the inner liquid hole overlap, the control motor drives the driving rod, driving wheel, transmission belt, driven wheel, rotating shaft, upper rotating circular plate and lower rotating circular plate to rotate until the liquid outlet check valve is installed The connecting pipe is connected with the inner liquid pipe, the electric control telescopic cylinder drives the liquid extraction circular plate to slide upward, the material in the fixed pipe enters the liquid extraction cylinder in one direction through the connecting pipe, the transition pipe, the lower through hole, the upper through hole, the liquid inlet one-way valve and the connecting pipe, the electric control telescopic cylinder drives the liquid extraction circular plate to slide downward, the material in the liquid extraction cylinder enters the reactor body in one direction through the connecting pipe, the liquid outlet one-way valve, the upper through hole, the lower through hole and the inner liquid pipe, the sampled material extracted during the whole sampling process does not contact the external environment, so the device can prevent the sampled material from being contaminated during the sampling process, and the excess sampled material can be added to the reactor body again, reducing the waste of sampled material; 3. During the sampling process of the device, the transfer and storage of materials are carried out in a closed environment, so there is no problem of volatilization and leakage of materials, which not only reduces the waste of materials but also improves the safety of the sampling process; 4. When the cold water passes through the annular cooling groove, it can cool the cooling pipe, and the cooling pipe can cool the rotating cylinder. When the sampled material is released from pressure, the two pressure-controlled circular plates slide back to back, which can not only reduce the pressure, but also increase the contact area between the sampled material and the rotating cylinder, thereby increasing the cooling area of ​​the sampled material. In the process of cooling the sampled material, the drive motor drives the transmission shaft and the two drive gears to rotate, thereby driving the driven gear and the rotating cylinder to rotate. During the rotation of the rotating cylinder, different areas of its inner wall contact with the sampled material in turn and cool it, thereby accelerating the cooling speed of the sampled material. The device can quickly cool the sampled material during the sampling process, greatly shortening the sampling cycle, and the device can greatly reduce the operation of the staff during the entire sampling process, and the staff does not need to wear heat insulation tools during the operation, thereby improving the convenience of the sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the end portion of the L-shaped plate supported by the present invention; Figure 3 It is a schematic diagram of the structure inside the rotating drum of the present invention; Figure 4 It is a schematic diagram of the structure inside the fixed cylinder of the present invention; Figure 5 This is a schematic diagram of the structure of the top of the reactor body of the present invention; Figure 6 It is a schematic diagram of the structure of the external liquid pipe and the external air pipe of the present invention; Figure 7 It is a schematic diagram of the structure of the internal liquid pipe and the internal ventilation pipe of the present invention; Figure 8 It is a structural schematic diagram of the sample transfer assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the cooling assembly of the present invention; Fig.10 It is a schematic diagram of the structure inside the cooling tube of the present invention.

[0023] In the figure: 1-reactor body; 2-drain pipe; 3-three-way valve; 4-connecting pipe; 5-rotating cylinder; 6-support L-shaped plate; 7-cooling assembly; 8-fixed pipe; 9-pressure gauge; 10-fixed cylinder; 11-transmission shaft; 12-driving gear; 13-limiting plate; 14-constant pressure hole; 15-control telescopic cylinder; 16-driven gear; 17-pressure control circular plate; 18-driving motor; 19-positioning plate; 20-transition pipe; 21-driven wheel; 22-sample transfer assembly; 23-constant pressure tank; 24-control motor; 25-driving rod; 26-driving wheel; 27-transmission belt; 28-external liquid hole; 29-external liquid pipe; 30- Adjusting gear; 31-internal liquid pipe; 32-transition gear; 33-driving shaft; 34-servo motor; 35-internal ventilation pipe; 36-driving gear; 37-external ventilation hole; 38-external ventilation pipe; 39-internal liquid hole; 40-internal ventilation hole; 41-lower through hole; 42-lower rotating circular plate; 43-upper through hole; 44-liquid outlet one-way valve; 45-upper rotating circular plate; 46-liquid extraction circular plate; 47-electrically controlled telescopic cylinder; 48-liquid extraction cylinder; 49-rotating shaft; 50-connecting pipe; 51-liquid inlet one-way valve; 52-circular groove; 53-supporting circular plate; 54-cooling pipe; 55-annular cooling groove; 56-water inlet pipe; 57-water outlet pipe. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0025] like Figures 1 to 10 As shown, a sampling mechanism for a reactor for producing diethyl allyl malonate comprises a reactor body 1, an upper outer wall of the reactor body 1 is fixedly provided with a supporting L-shaped plate 6, an end of the supporting L-shaped plate 6 is fixedly provided with a horizontally arranged fixed tube 8, both sides of the fixed tube 8 are coaxially provided with a rotatable rotating cylinder 5, the open ends of the two rotating cylinders 5 are arranged opposite to each other, the open ends of the two rotating cylinders 5 respectively extend into the two ports of the fixed tube 8 and are rotatably sealed and connected to the fixed tube 8, a pressure control circular plate 17 is coaxially provided in the rotating cylinder 5 and is slidably sealed and connected thereto, a horizontally arranged control telescopic cylinder 15 is fixedly provided on the inner wall of the rotating cylinder 5, the telescopic end of the control telescopic cylinder 15 is fixedly connected to the pressure control circular plate 17, a constant pressure hole 14 is penetrated at the end of the rotating cylinder 5, the outer wall of the rotating cylinder 5 is covered with a cooling assembly 7, and the outer wall of the fixed tube 8 is fixedly provided with a pressure gauge 9 for monitoring the internal pressure thereof, A fixed cylinder 10 with an open end downwardly disposed is fixedly disposed on the top of the reactor body 1, and a sample transfer assembly 22 for transferring materials is disposed in the fixed cylinder 10. A vertically disposed external liquid pipe 29 and an external ventilation pipe 38 are disposed at a position located in the fixed cylinder 10 at the top of the reactor body 1. The lower ends of the external liquid pipe 29 and the external ventilation pipe 38 are both sealed, and the upper ends of the external liquid pipe 29 and the external ventilation pipe 38 extend upward through the reactor body 1 into the fixed cylinder 10. The external liquid pipe 29 and the external ventilation pipe 38 are both rotationally sealed and connected to the reactor body 1, and the external liquid pipe 29 and the external ventilation pipe 38 are synchronously rotated, and an internal liquid pipe 31 and an internal ventilation pipe 35 are coaxially fixedly disposed inside the external liquid pipe 29 and the external ventilation pipe 38, and the internal liquid pipe 31 and the internal ventilation pipe 35 correspond to the external liquid pipe 29 and the external ventilation pipe 38. Rotationally sealed connection, the lower ends of the inner liquid tube 31 and the inner ventilation tube 35 are both sealed and frictionally abutted against the inner bottoms of the outer liquid tube 29 and the outer ventilation tube 38, the upper end of the inner liquid tube 31 extends upward into the fixed cylinder 10 and is fixedly connected with the sample transfer assembly 22, the upper end of the inner ventilation tube 35 extends upward into the fixed cylinder 10 and passes through the fixed cylinder 10 to communicate with the inner cavity of the fixed tube 8, the inner ventilation tube 35 is fixedly connected with the fixed cylinder 10, the lower outer walls of the outer liquid tube 29 and the inner liquid tube 31 are respectively penetrated with an outer liquid hole 28 and an inner liquid hole 39, the lower outer wall of the outer ventilation tube 38 is circumferentially provided with two outer ventilation holes 37 penetrated, the lower outer wall of the inner ventilation tube 35 is penetrated with an inner ventilation hole 40, when the inner liquid hole 39 overlaps with the outer liquid hole 28, the inner ventilation hole 40 overlaps with one of the outer ventilation holes 37, A connecting tube 4 connected to the inner cavity of the fixed tube 8 is fixedly provided on the lower outer wall thereof, a transition tube 20 connected to the sample transfer assembly 22 is provided in the fixed tube 10, one end of the transition tube 20 passes through the fixed tube 10 and extends to the outside, a fixed drainage tube 2 is vertically penetrated through the top of the supporting L-shaped plate 6, a three-way valve 3 is provided above the supporting L-shaped plate 6, and the three ports of the three-way valve 3 are connected to the connecting tube 4, the transition tube 20 and the drainage tube 2 correspondingly; When sampling the material in the reactor body 1, the three-way valve 3 is adjusted to the connection pipe 4 and the transition pipe 20, the external ventilation pipe 38 is rotated to the internal ventilation hole 40 and overlaps with one of the external ventilation holes 37, at this time, the external liquid hole 28 and the internal liquid hole 39 do not overlap, the interior of the reactor body 1 is connected to the interior of the fixed tube 8, the interior of the reactor body 1 and the interior of the fixed tube 8 are at the same pressure, the external ventilation pipe 38 is rotated to the internal ventilation hole 40 and overlaps with another external ventilation hole 37, at this time, the external liquid hole 28 and the internal liquid hole 39 overlap, the material in the reactor body 1 can be extracted into the fixed tube 8 through the sample transfer component 22, after a certain amount of material is extracted, the external liquid pipe 29 and the external ventilation pipe 38 are reset, the telescopic end of the telescopic cylinder 15 is controlled to contract, the two pressure control circular plates 17 slide back to back, and the fixed tube 8 is fixed. The air pressure in the closed space formed by the fixed tube 8 and the two rotating cylinders 5 decreases until it decreases to normal pressure. The staff puts the test tube at the lower end of the discharge tube 2, adjusts the three-way valve 3 to connect the connecting tube 4 with the discharge tube 2, controls the extension of the telescopic end of the telescopic cylinder 15, and under the pressure of the pressure control circular plate 17, the material in the fixed tube 8 enters the test tube through the connecting tube 4 and the discharge tube 2 until the sampling is completed. The device can realize sampling without releasing the pressure on the reactor body 1. The sampling process does not affect the normal progress of the reaction in the reactor body 1. During the sampling process, the material in the reactor body 1 does not contact the external environment, which effectively prevents the material in the reactor body 1 from being contaminated. When the device samples the material, the reactor body 1 does not need to release or increase the pressure, which simplifies the sampling process. After the sampling is completed, the three-way valve 3 is adjusted to the connecting pipe 4 and the transition pipe 20 are connected, the telescopic cylinder 15 is controlled to drive the pressure control circular plate 17 to reset, and the external ventilation pipe 38 is rotated again until the internal ventilation hole 40 overlaps with one of the external ventilation holes 37. At this time, the external liquid hole 28 and the internal liquid hole 39 do not overlap, and the interior of the reactor body 1 is connected to the interior of the fixed tube 8. The interior of the reactor body 1 and the interior of the fixed tube 8 are under the same pressure again, and the external ventilation pipe 38 is rotated until the internal ventilation hole 40 overlaps with another external ventilation hole 37. At this time, the external liquid hole 28 and the internal liquid hole 39 overlap, and the excess sampling material in the fixed tube 8 is extracted into the reactor body 1 through the sample transfer component 22. The extracted sampling material does not contact the external environment during the entire sampling process. Therefore, the device can prevent the sampling material from being contaminated during the sampling process, and the excess sampling material can be added to the reactor body 1 again, reducing the waste of sampling material. During the sampling process of the device, the transfer and storage of materials are carried out in a closed environment, so there is no problem of volatilization and leakage of materials, which not only reduces the waste of materials but also improves the safety of the sampling process.

[0026] The sample transfer assembly 22 includes a liquid extraction cylinder 48 vertically fixed to the top of the fixed cylinder 10, the bottom of the liquid extraction cylinder 48 is open and extends downward through the fixed cylinder 10 to the inside, an upper rotating circular plate 45 is coaxially provided in the lower port of the liquid extraction cylinder 48 and is rotatably sealed therewith, a supporting circular plate 53 is fixedly provided in the fixed cylinder 10 and is coaxially provided with the liquid extraction cylinder 48, a circular groove 52 is coaxially provided on the top of the supporting circular plate 53, a lower rotating circular plate 42 is coaxially provided in the circular groove 52 and is rotatably sealed therewith with its inner wall, the lower rotating circular plate 42 is frictionally abutted against the bottom of the circular groove 52, two upper through holes 43 are uniformly distributed along the circumferential direction on the top of the lower rotating circular plate 42, two lower through holes 41 are uniformly distributed along the circumferential direction on the bottom of the circular groove 52, and two lower through holes 41 are fixedly provided at the bottom of the upper rotating circular plate 45 and are connected to the liquid extraction cylinder The connecting pipes 50 are connected to the inner cavity of 48, the lower ports of the two connecting pipes 50 are fixedly connected to the lower rotating circular plate 42 and are correspondingly connected to the two upper through holes 43, and the two connecting pipes 50 are respectively provided with a liquid inlet check valve 51 and a liquid outlet check valve 44, the upper port of the inner liquid pipe 31 is fixedly connected to the bottom of the supporting circular plate 53 and is connected to one of the lower through holes 41, and one port of the transition pipe 20 is fixedly connected to the bottom of the supporting circular plate 53 and is connected to the other lower through hole 41, and the position above the upper rotating circular plate 45 inside the liquid pumping cylinder 48 is coaxially provided with a liquid pumping circular plate 46 connected to the upper rotating circular plate 45 with a sliding seal, and the inner top of the liquid pumping cylinder 48 is fixedly provided with a vertically arranged electric control telescopic cylinder 47, and the telescopic end of the electric control telescopic cylinder 47 is fixedly connected to the liquid pumping circular plate 46, and the top of the liquid pumping cylinder 48 is penetrated by a constant pressure groove 23; When extracting materials into the fixed pipe 8, the upper rotating circular plate 45 and the lower rotating circular plate 42 rotate until the connecting pipe 50 equipped with the liquid inlet check valve 51 is connected to the inner liquid pipe 31, and the telescopic end of the electric control telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide upward, and the materials in the inner liquid pipe 31 enter the liquid extraction cylinder 48 in one direction through the lower through hole 41, the upper through hole 43, the liquid inlet check valve 51 and the connecting pipe 50, and the electric control telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide downward, and the materials in the liquid extraction cylinder 48 enter the transition pipe 20 in one direction through the connecting pipe 50, the liquid outlet check valve 44, the upper through hole 43 and the lower through hole 41; When extracting excess sampling material into the reactor body 1, the upper rotating circular plate 45 and the lower rotating circular plate 42 rotate until the connecting pipe 50 equipped with the liquid outlet one-way valve 44 is connected to the internal liquid pipe 31, and the liquid extraction circular plate 46 slides upward, and the material in the transition pipe 20 enters the liquid extraction cylinder 48 in one direction through the lower through hole 41, the upper through hole 43, the liquid inlet one-way valve 51 and the connecting pipe 50, and the liquid extraction circular plate 46 slides downward, and the material in the liquid extraction cylinder 48 enters the reactor body 1 in one direction through the connecting pipe 50, the liquid outlet one-way valve 44, the upper through hole 43 and the lower through hole 41.

[0027] The cooling assembly 7 includes a cooling pipe 54 sleeved on the outer wall of the rotating cylinder 5, the cooling pipe 54 is fixedly connected to the end of the supporting L-shaped plate 6, the rotating cylinder 5 is rotatably connected to the cooling pipe 54, an annular cooling groove 55 is arranged inside the cooling pipe 54, and an inlet pipe 56 and an outlet pipe 57 connected to both ends of the annular cooling groove 55 are fixedly arranged on the outer wall of the cooling pipe 54, and one of the ports of the inlet pipe 56 and the outlet pipe 57 passes through the supporting L-shaped plate 6 and is connected to an external circulating cold water source; When the cold water passes through the annular cooling groove 55, it can cool the cooling tube 54, and the cooling tube 54 can cool the rotating cylinder 5. When the sampled material is released from pressure, the two pressure-control circular plates 17 slide back to back, which can not only reduce the pressure, but also increase the contact area between the sampled material and the rotating cylinder 5, thereby increasing the cooling area of ​​the sampled material. In the process of cooling the sampled material, the rotating cylinder 5 rotates, and different areas of the inner wall of the rotating cylinder 5 contact and cool the sampled material in turn, thereby accelerating the cooling speed of the sampled material. The device can quickly cool the sampled material during the sampling process, greatly shortening the sampling cycle, and the device can greatly reduce the operation of the staff during the entire sampling process, and the staff does not need to wear heat insulation tools during the operation, thereby improving the convenience of the sampling process.

[0028] A driven gear 16 is fixedly mounted on the outer wall of the rotating cylinder 5, and two vertically arranged limit plates 13 are fixedly mounted on the end of the supporting L-shaped plate 6. A transmission shaft 11 is arranged to rotate along a horizontal line between the two limit plates 13, and both ends of the transmission shaft 11 are correspondingly connected to the two limit plates 13 for rotation. Two driving gears 12 are fixedly mounted on the outer wall of the transmission shaft 11, and the two driving gears 12 are correspondingly meshed with the two driven gears 16.

[0029] A driving motor 18 is fixedly mounted on one end of one of the limiting plates 13 , and an output end of the driving motor 18 passes through the limiting plate 13 and is fixedly connected to the transmission shaft 11 .

[0030] The outer walls of the external liquid pipe 29 and the external ventilation pipe 38 are located in the fixed cylinder 10 and are respectively fixedly mounted with a direction adjustment gear 30 and a transition gear 32, the direction adjustment gear 30 is meshed with the transition gear 32, and the top of the reactor body 1 is located in the fixed cylinder 10 and is rotatably provided with a driving gear 36 that is meshed with the transition gear 32.

[0031] A driving shaft 33 is provided at the top of the reactor body 1 located inside the fixed cylinder 10 and is rotatably arranged along a plumb line. A driving gear 36 is fixedly sleeved on the driving shaft 33. A servo motor 34 is fixedly arranged at the top of the fixed cylinder 10. The output end of the servo motor 34 passes through the fixed cylinder 10 and is fixedly connected to the driving shaft 33.

[0032] The top of the reactor body 1 is located in the fixed cylinder 10 and is rotatably provided with a rotating shaft 49 coaxially arranged with the supporting circular plate 53. The top of the rotating shaft 49 passes upward through the supporting circular plate 53 and the lower rotating circular plate 42 and is fixedly connected to the upper rotating circular plate 45. The lower rotating circular plate 42 is fixedly connected to the rotating shaft 49, and the supporting circular plate 53 is rotatably connected to the rotating shaft 49.

[0033] A driving rod 25 rotatably arranged along a vertical line is provided at the top of the reactor body 1 located inside the fixed cylinder 10. A driving wheel 26 is fixedly sleeved on the outer wall of the driving rod 25. A driven wheel 21 is fixedly sleeved on the lower outer wall of the rotating shaft 49. The driving wheel 26 is connected to the driven wheel 21 via a transmission belt 27.

[0034] A control motor 24 is fixedly provided on the top of the fixed cylinder 10 , and an output end of the control motor 24 passes through the fixed cylinder 10 and is fixedly connected to the driving rod 25 .

[0035] The supporting circular plate 53 is fixedly connected to the reactor body 1 through a plurality of positioning plates 19 .

[0036] The working principle of this device is: When sampling the material in the reactor body 1, the three-way valve 3 is adjusted to connect the connecting pipe 4 with the transition pipe 20, and the servo motor 34 drives the driving shaft 33 to rotate, thereby driving the driving gear 36, the transition gear 32 and the adjustment gear 30 to rotate, thereby driving the external liquid pipe 29 and the external ventilation pipe 38 to rotate until the internal ventilation hole 40 overlaps with one of the external ventilation holes 37. At this time, the external liquid hole 28 and the internal liquid hole 39 do not overlap, and the interior of the reactor body 1 is connected to the interior of the fixed pipe 8. At the same pressure, the servo motor 34 drives the outer ventilation pipe 38 to rotate until the inner ventilation hole 40 overlaps with another outer ventilation hole 37. At this time, the outer liquid hole 28 overlaps the inner liquid hole 39, and the electric-controlled telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide upward, and the material in the inner liquid tube 31 enters the liquid extraction cylinder 48 in one direction through the lower through hole 41, the upper through hole 43, the liquid inlet one-way valve 51 and the connecting pipe 50. The electric-controlled telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide downward, and the material in the liquid extraction cylinder 48 passes through the connecting pipe 50, the liquid outlet one-way valve 44, the upper through hole 43, the liquid inlet one-way valve 51 and the connecting pipe 50. The hole 43, the lower through hole 41, the transition pipe 20 and the connecting pipe 4 enter the fixed pipe 8 in one direction. After a certain amount of material is extracted, the servo motor 34 drives the external liquid pipe 29 and the external air pipe 38 to reset, controls the telescopic end of the telescopic cylinder 15 to contract, and the two pressure control circular plates 17 slide back to back. The air pressure in the closed space formed by the fixed pipe 8 and the two rotating cylinders 5 decreases until it decreases to normal pressure. The staff puts the test tube at the lower end of the discharge pipe 2, adjusts the three-way valve 3 to connect the connecting pipe 4 with the discharge pipe 2, and controls the extension of the telescopic end of the telescopic cylinder 15. Under the pressure of the pressure control circular plate 17, the material in the fixed tube 8 enters the test tube through the connecting tube 4 and the discharge tube 2 until the sampling is completed. The device can realize sampling without releasing the pressure of the reactor body 1. The sampling process does not affect the normal reaction in the reactor body 1. During the sampling process, the material in the reactor body 1 does not contact the external environment, which effectively prevents the material in the reactor body 1 from being contaminated. When the device samples the material, the reactor body 1 does not need to release or increase the pressure, which simplifies the sampling process. After the sampling is completed, the three-way valve 3 is adjusted to the connection between the connecting pipe 4 and the transition pipe 20, the telescopic cylinder 15 is controlled to drive the pressure control circular plate 17 to reset, and the servo motor 34 drives the external ventilation pipe 38 to rotate again until the internal ventilation hole 40 overlaps with one of the external ventilation holes 37. At this time, the external liquid hole 28 and the internal liquid hole 39 do not overlap, and the interior of the reactor body 1 is connected to the interior of the fixed pipe 8. The interior of the reactor body 1 and the interior of the fixed pipe 8 are under the same pressure again, and the servo motor 34 drives the external ventilation pipe 38 to rotate until the internal ventilation hole 40 overlaps with another external ventilation hole 37. At this time, the external liquid hole 28 and the internal liquid hole 39 overlap, and the control motor 24 drives the driving rod 25, the driving wheel 26, the transmission belt 27, the driven wheel 21, the rotating shaft 49, the upper rotating circular plate 45 and the lower rotating circular plate 42 to rotate until the outlet is installed. The connecting pipe 50 of the liquid check valve 44 is connected with the internal liquid pipe 31, and the electrically controlled telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide upward, and the material in the fixed tube 8 enters the liquid extraction cylinder 48 in one direction through the connecting pipe 4, the transition pipe 20, the lower through hole 41, the upper through hole 43, the liquid inlet one-way valve 51 and the connecting pipe 50, and the electrically controlled telescopic cylinder 47 drives the liquid extraction circular plate 46 to slide downward, and the material in the liquid extraction cylinder 48 enters the reactor body 1 in one direction through the connecting pipe 50, the liquid outlet one-way valve 44, the upper through hole 43, the lower through hole 41 and the internal liquid pipe 31. The sampled material extracted during the entire sampling process does not contact the external environment. Therefore, the device can prevent the sampled material from being contaminated during the sampling process, and the excess sampled material can be added to the reactor body 1 again, reducing the waste of sampled material; During the sampling process of the device, the transfer and storage of materials are carried out in a closed environment, so there is no problem of volatilization and leakage of materials, which not only reduces the waste of materials but also improves the safety of the sampling process; When the cold water passes through the annular cooling groove 55, it can cool the cooling tube 54, and the cooling tube 54 can cool the rotating cylinder 5. When the sampled material is released from pressure, the two pressure control circular plates 17 slide back to back, which can not only reduce the pressure, but also increase the contact area between the sampled material and the rotating cylinder 5, thereby increasing the cooling area of ​​the sampled material. In the process of cooling the sampled material, the driving motor 18 drives the transmission shaft 11 and the two driving gears 12 to rotate, thereby driving the driven gear 16 and the rotating cylinder 5 to rotate. During the rotation of the rotating cylinder 5, different areas of its inner wall contact with the sampled material in turn and cool it, thereby accelerating the cooling speed of the sampled material. The device can quickly cool the sampled material during the sampling process, greatly shortening the sampling cycle, and the device can greatly reduce the operation of the staff during the entire sampling process, and the staff does not need to wear heat insulation tools during the operation, thereby improving the convenience of the sampling process.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A sampling mechanism for a reactor for producing diethyl allyl malonate, characterized in that: The invention comprises a reactor body (1), wherein a supporting L-shaped plate (6) is fixedly provided on the upper outer wall of the reactor body (1), a horizontally arranged fixed tube (8) is fixedly provided on the end of the supporting L-shaped plate (6), a rotating cylinder (5) is coaxially provided on both sides of the fixed tube (8), the open ends of the two rotating cylinders (5) are arranged facing each other, the open ends of the two rotating cylinders (5) respectively extend into the two ports of the fixed tube (8) and are rotationally sealed with the fixed tube (8), a pressure control circular plate (17) is coaxially provided in the rotating cylinder (5) and is slidingly sealed with the rotating cylinder (5), a horizontally arranged control telescopic cylinder (15) is fixedly provided on the inner wall of the rotating cylinder (5), the telescopic end of the control telescopic cylinder (15) is fixedly connected to the pressure control circular plate (17), a constant pressure hole (14) is penetrated at the end of the rotating cylinder (5), the outer wall of the rotating cylinder (5) is sleeved with a cooling assembly (7), and a pressure gauge (9) for monitoring the internal pressure of the rotating cylinder (8) is fixedly provided on the outer wall of the fixed tube (8), A fixed cylinder (10) with an open end facing downward is fixedly provided on the top of the reactor body (1), and a sample transfer assembly (22) for transferring materials is provided in the fixed cylinder (10). A vertically arranged external liquid pipe (29) and an external ventilation pipe (38) are provided at a position located in the fixed cylinder (10) at the top of the reactor body (1), and the lower ends of the external liquid pipe (29) and the external ventilation pipe (38) are both sealed, and the upper ends of the external liquid pipe (29) and the external ventilation pipe (38) are both upwardly facing. The outer liquid pipe (29) and the outer ventilation pipe (38) are both rotatably sealed and connected to the reactor body (1), and the outer liquid pipe (29) and the outer ventilation pipe (38) are synchronously rotatably arranged. The inner parts of the outer liquid pipe (29) and the outer ventilation pipe (38) are coaxially fixed with an inner liquid pipe (31) and an inner ventilation pipe (35), respectively. The inner liquid pipe (31) and the inner ventilation pipe (35) are correspondingly connected to the outer liquid pipe (29) and the outer ventilation pipe (35). 8) a rotationally sealed connection, the lower ends of the inner liquid tube (31) and the inner ventilation tube (35) are both sealed and frictionally abut against the inner bottoms of the outer liquid tube (29) and the outer ventilation tube (38), the upper end of the inner liquid tube (31) extends upward into the fixed cylinder (10) and is fixedly connected to the sample transfer assembly (22), the upper end of the inner ventilation tube (35) extends upward into the fixed cylinder (10) and passes through the fixed cylinder (10) to communicate with the inner cavity of the fixed tube (8), and the inner ventilation tube (35) ) is fixedly connected to the fixed cylinder (10), the lower outer walls of the external liquid pipe (29) and the internal liquid pipe (31) are respectively penetrated with an external liquid hole (28) and an internal liquid hole (39), the lower outer wall of the external ventilation pipe (38) is provided with two external ventilation holes (37) penetrated along the circumferential direction, the lower outer wall of the internal ventilation pipe (35) is penetrated with an internal ventilation hole (40), when the internal liquid hole (39) overlaps with the external liquid hole (28), the internal ventilation hole (40) overlaps with one of the external ventilation holes (37), A connecting pipe (4) connected to the inner cavity of the fixed tube (8) is fixedly provided on the lower outer wall thereof; a transition pipe (20) connected to the sample transfer assembly (22) is provided in the fixed cylinder (10); one end of the transition pipe (20) passes through the fixed cylinder (10) and extends to the outside; a drainage pipe (2) is fixedly provided on the top of the supporting L-shaped plate (6) and vertically penetrated; a three-way valve (3) is provided above the supporting L-shaped plate (6); the three ports of the three-way valve (3) are correspondingly connected to the connecting pipe (4), the transition pipe (20) and the drainage pipe (2).

2. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 1, characterized in that: The sample transfer assembly (22) comprises a liquid extraction cylinder (48) vertically fixed to the top of the fixed cylinder (10), the bottom of the liquid extraction cylinder (48) is open and extends downward through the fixed cylinder (10) to the inside, an upper rotating circular plate (45) is coaxially provided in the lower port of the liquid extraction cylinder (48) and is rotatably sealed therewith, a supporting circular plate (53) is fixedly provided in the fixed cylinder (10) and is coaxially provided with the liquid extraction cylinder (48), a circular groove (52) is coaxially provided on the top of the supporting circular plate (53), a lower rotating circular plate (42) is coaxially provided in the circular groove (52) and is rotatably sealed therewith its inner wall, the lower rotating circular plate (42) is frictionally abutted against the bottom of the circular groove (52), two upper through holes (43) are uniformly distributed along the circumferential direction on the top of the lower rotating circular plate (42), two lower through holes (41) are uniformly distributed along the circumferential direction on the bottom of the circular groove (52), and two fixing holes (41) are fixedly provided at the bottom of the upper rotating circular plate (45) and are connected to the liquid extraction cylinder. (48) a connecting pipe (50) connected to the inner cavity, the lower ends of the two connecting pipes (50) are fixedly connected to the lower rotating circular plate (42) and are correspondingly connected to the two upper through holes (43), the two connecting pipes (50) are respectively provided with a liquid inlet check valve (51) and a liquid outlet check valve (44), the upper end of the inner liquid connecting pipe (31) is fixedly connected to the bottom of the supporting circular plate (53) and is connected to one of the lower through holes (41), and one end of the transition pipe (20) is fixedly connected to The bottom of the supporting circular plate (53) is connected to another lower through hole (41); a liquid extraction circular plate (46) is coaxially provided inside the liquid extraction cylinder (48) and is slidably and sealably connected to the upper rotating circular plate (45); a vertically arranged electric-controlled telescopic cylinder (47) is fixedly provided on the inner top of the liquid extraction cylinder (48); the telescopic end of the electric-controlled telescopic cylinder (47) is fixedly connected to the liquid extraction circular plate (46); and a constant pressure groove (23) is penetrated through the top of the liquid extraction cylinder (48).

3. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 1, characterized in that: The cooling assembly (7) comprises a cooling pipe (54) sleeved on the outer wall of the rotating cylinder (5), the cooling pipe (54) being fixedly connected to the end of the supporting L-shaped plate (6), the rotating cylinder (5) being rotatably connected to the cooling pipe (54), an annular cooling groove (55) being provided inside the cooling pipe (54), a water inlet pipe (56) and a water outlet pipe (57) being fixedly provided on the outer wall of the cooling pipe (54) and being connected to both ends of the annular cooling groove (55), one of the ports of the water inlet pipe (56) and the water outlet pipe (57) passing through the supporting L-shaped plate (6) and being connected to an external circulating cold water source.

4. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 1, characterized in that: The outer wall of the rotating cylinder (5) is fixedly sleeved with a driven gear (16); the end of the supporting L-shaped plate (6) is fixedly provided with two vertically arranged limit plates (13); a transmission shaft (11) is arranged between the two limit plates (13) and is rotatably arranged along a horizontal line; the two ends of the transmission shaft (11) are correspondingly rotatably connected to the two limit plates (13); the outer wall of the transmission shaft (11) is fixedly sleeved with two driving gears (12); the two driving gears (12) are correspondingly meshed with the two driven gears (16).

5. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 4, characterized in that: A drive motor (18) is fixedly provided at the end of one of the limit plates (13), and an output end of the drive motor (18) passes through the limit plate (13) and is fixedly connected to the transmission shaft (11).

6. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 1, characterized in that: The outer walls of the external liquid pipe (29) and the external air pipe (38) are respectively fixedly mounted with a direction-adjusting gear (30) and a transition gear (32) at positions located in the fixed cylinder (10), and the direction-adjusting gear (30) is meshed with the transition gear (32). The top of the reactor body (1) is rotatably mounted with a driving gear (36) meshed with the transition gear (32) at a position located in the fixed cylinder (10).

7. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 6, characterized in that: A driving shaft (33) is provided at a position on the top of the reactor body (1) located inside the fixed cylinder (10) and is arranged to rotate along a vertical line. The driving gear (36) is fixedly sleeved on the driving shaft (33). A servo motor (34) is fixedly provided on the top of the fixed cylinder (10). The output end of the servo motor (34) passes through the fixed cylinder (10) and is fixedly connected to the driving shaft (33).

8. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 2, characterized in that: The top of the reactor body (1) is located in a position inside the fixed cylinder (10) and is rotatably provided with a rotating shaft (49) coaxially arranged with the supporting circular plate (53); the top of the rotating shaft (49) passes upward through the supporting circular plate (53) and the lower rotating circular plate (42) and is fixedly connected to the upper rotating circular plate (45); the lower rotating circular plate (42) is fixedly connected to the rotating shaft (49); and the supporting circular plate (53) is rotatably connected to the rotating shaft (49).

9. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 8, characterized in that: A driving rod (25) is provided at a position located at the top of the reactor body (1) in the fixed cylinder (10) and is rotatably arranged along a vertical line. A driving wheel (26) is fixedly sleeved on the outer wall of the driving rod (25). A driven wheel (21) is fixedly sleeved on the lower outer wall of the rotating shaft (49). The driving wheel (26) is connected to the driven wheel (21) via a transmission belt (27).

10. The sampling mechanism for the reaction kettle for producing diethyl allyl malonate according to claim 9, characterized in that: A control motor (24) is fixedly provided on the top of the fixed cylinder (10), and an output end of the control motor (24) passes through the fixed cylinder (10) and is fixedly connected to a driving rod (25).

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