Vacuum material extraction device for methyl chloroacetate production

Abstract

This utility model relates to a vacuum feeding device for the production of methyl chloroacetate, belonging to the field of chemical production technology. It includes a vacuum feeding machine body installed on a reactor, and a lifting and adjusting mechanism comprising a vertically arranged lifting drive. A fixed plate is fixed to the upper part of the cylinder of the lifting drive, and a lifting crossbeam is fixed to the telescopic end of the lifting drive. The front end of the lifting crossbeam is fixedly connected to a suction gun, and the rear end of the lifting crossbeam is fixedly connected to an optical shaft. A sliding sleeve that slides with the optical shaft is provided on the fixed plate. This utility model has the following advantages: It uses pneumatic conveying to transport the raw materials for methyl chloroacetate production from a mobile raw material storage tank to the reactor via a suction gun, suction pipe, and vacuum feeding machine body for methyl chloroacetate production. This replaces the manual suction gun method used by workers, saving labor, increasing efficiency, and significantly improving operational efficiency and safety.

Description

Technical Field

[0001] This utility model relates to a vacuum material extraction device for the production of methyl chloroacetate, belonging to the field of chemical production technology. Background Technology

[0002] In a broad sense, a reaction vessel is a stainless steel container where physical or chemical reactions occur. The structure and parameters of the vessel are designed and configured according to different process requirements. Design conditions, processes, inspection, manufacturing, and acceptance must adhere to relevant technical standards to achieve the heating, evaporation, cooling, and low-to-high-speed mixing reaction functions required by the process. Methyl chloroacetate is an important organic synthesis raw material, a crucial intermediate in the synthesis of pesticides and pharmaceuticals. Currently, methyl chloroacetate is produced by mixing and reacting in a reaction vessel. However, the production of methyl chloroacetate requires an esterification reaction between chloroacetic acid and methanol.

[0003] Utility model patent number 202320428392.6 discloses a methyl chloroacetate preparation apparatus, including a reaction vessel with chloroacetic acid inlet pipes and methanol inlet pipes respectively arranged on the upper and lower right sides of the reaction vessel, a gas outlet pipe arranged on the top left side of the reaction vessel, and a reflux pipe arranged on the left side of the reaction vessel; a drive assembly mounted on the reaction vessel; and a mixing assembly mounted on the drive assembly. This utility model has a reasonable design, allowing the lower connecting rod to move up and down while stirring, ensuring thorough mixing of the upper and lower liquid layers and reducing the preparation time.

[0004] While the aforementioned patent enables the production of methyl chloroacetate, its current technology is not comprehensive and has the following drawbacks: 1. Most companies still rely on workers to manually operate suction guns for material extraction, which is labor-intensive and inefficient. 2. The lack of a positional fine-tuning mechanism prevents vertical adjustments to the suction gun's position relative to the lifting beam. If the suction port at the bottom of the suction gun is not positioned close to the bottom of the mobile raw material storage tank, poor material extraction will occur.

[0005] To solve one of the above problems, there is an urgent need for a vacuum material extraction device for the production of methyl chloroacetate. Utility Model Content

[0006] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to solve the problem that workers have high labor intensity and low efficiency when using hand-held suction guns to suck up materials. To this end, a vacuum suction device for the production of methyl chloroacetate is provided.

[0007] The vacuum feeding device for the production of methyl chloroacetate according to this utility model includes a vacuum feeder body installed on a reaction vessel. The suction port of the vacuum feeder body is connected to a suction gun through a suction pipe, and the exhaust port of the vacuum feeder body is connected to a vacuum pump through a vacuum pipe. The device is characterized by further including a movable raw material storage tank that cooperates with the suction gun and a lifting adjustment mechanism for driving the suction gun to rise and fall. The lifting adjustment mechanism includes a vertically arranged lifting driver. A fixed plate is fixed to the upper part of the cylinder of the lifting driver. A lifting crossbeam is fixed to the telescopic end of the lifting driver. The front end of the lifting crossbeam is fixedly connected to the suction gun, and the rear end of the lifting crossbeam is fixedly connected to an optical axis. A sliding sleeve that slides with the optical axis is provided on the fixed plate.

[0008] When the mobile raw material storage tank is positioned below the suction gun, the lifting beam can be lowered from a high position to a low position via the lifting driver. As the lifting beam lowers, the suction gun gradually inserts into the interior of the mobile raw material storage tank, moving the inlet of the suction gun to the bottom of the tank. The vacuum pump is then activated, and the raw material for methyl chloroacetate production in the mobile raw material storage tank is transported to the reactor via the suction gun, suction pipe, and vacuum feeder body through pneumatic conveying. Once the material extraction is complete, the lifting driver raises the suction gun to its original position. This device replaces the manual suction gun method used by workers, saving labor, increasing efficiency, and significantly improving operational efficiency and safety.

[0009] Each component can be processed and assembled individually, simplifying the assembly process. The simple structure reduces complex processing requirements and lowers manufacturing costs.

[0010] Preferably, in any of the above embodiments, the suction pipe includes a negative pressure resistant hose connected to the suction gun, the upper end of the negative pressure resistant hose is connected to a horizontal pipe section, and the other end of the horizontal pipe section is connected to the suction port of the vacuum feeder body. The negative pressure resistant hose has high pressure resistance and flexibility to avoid rupture or air leakage due to bending or stretching when the suction gun is raised or lowered, and to avoid interference with the raising and lowering of the suction gun.

[0011] In any of the above embodiments, it is preferred that the negative pressure resistant hose is a plastic-reinforced spiral hose. The plastic-reinforced spiral structure, such as that made of PVC or PU material, significantly improves the ring stiffness of the hose through the built-in rigid plastic ribs or steel wire reinforcement layer, and can withstand negative pressures of more than 0.8 MPa, making it suitable for vacuum suction, high-pressure conveying and other scenarios.

[0012] In any of the above embodiments, it is preferred that the bottom end of the lifting drive is fixed to the base. The fixation is secure.

[0013] In any of the above embodiments, it is preferred that a pull rope sensor is fixed on the lifting drive, the pull rope sensor’s pull wire is fixed on the lifting beam, the pull rope sensor is electrically connected to the signal input terminal of the controller, the controller is electrically connected to the solenoid valve that controls the extension and retraction of the lifting drive, and the pull rope sensor detects the distance change between the pull rope sensors of the lifting beam, so as to achieve the purpose of accurately controlling the lifting of the lifting beam through the lifting drive.

[0014] In any of the above embodiments, it is preferred that the suction gun is mounted on the lifting beam via a position fine-tuning mechanism.

[0015] In any of the above embodiments, it is preferred that the lifting beam is a hollow rectangular tubular structure.

[0016] In any of the above embodiments, the preferred embodiment is that the position fine-tuning mechanism includes a clamp A and a clamp B fixed on the suction gun. An upper fixing plate and a lower fixing plate are respectively fixed on the clamp A and the clamp B. A slide rail and a height fine-tuning screw are fixed between the upper fixing plate and the lower fixing plate. The height fine-tuning screw passes through the telescopic beam. The telescopic beam is plugged into the lifting crossbeam. Nuts A and B are threaded onto the height fine-tuning screws on both sides of the telescopic beam. A slider that slides with the slide rail is provided at the end of the telescopic beam.

[0017] By adjusting the positions of nuts A and B on the height fine-tuning screw, the distance between the upper fixed plate and the telescopic beam can be adjusted, thereby fine-tuning the position of the suction gun relative to the lifting beam in the vertical direction. This ensures that when the lifting beam is lowered to its lowest position, the suction port at the bottom of the suction gun can be as close as possible to the inner bottom of the mobile raw material storage tank, optimizing the material extraction effect.

[0018] In any of the above embodiments, preferably, a vertical fixing plate B is fixed to the telescopic beam, and a horizontal fine-tuning screw is provided on the vertical fixing plate B. The horizontal fine-tuning screw passes through the vertical fixing plate A, and the vertical fixing plate A is fixed to the outer wall of the lifting beam. Nuts C and D are respectively provided on the horizontal fine-tuning screws on both sides of the vertical fixing plate A. By adjusting nuts C and D, the depth of the telescopic beam inserted into the lifting beam is adjusted, changing the horizontal position of the suction gun relative to the lifting beam, so that the suction gun is inserted as close as possible to the center of the mobile raw material storage tank. Specifically, simultaneously rotating nuts C and D clockwise causes the vertical fixing plate B to move closer to the vertical fixing plate A, and the telescopic beam to be further inserted into the lifting beam. After adjustment, nuts C and D are tightly attached to both sides of the vertical fixing plate A to prevent relative movement between the telescopic beam and the lifting beam. Simultaneously rotating nuts C and D counterclockwise causes the vertical fixing plate B to move away from the vertical fixing plate A, and the telescopic beam to be pulled out of the lifting beam. After adjustment, nuts C and D are tightly attached to both sides of the vertical fixing plate A to prevent relative movement between the telescopic beam and the lifting beam.

[0019] In any of the above embodiments, it is preferred that the pipe clamp A includes a first half-clamp and a second half-clamp arranged opposite to each other. One end of the first half-clamp is detachably connected to one end of the second half-clamp by a locking bolt one, and the other end of the first half-clamp is detachably connected to the other end of the second half-clamp by a locking bolt two. The upper fixing plate is welded to the second half-clamp. Disassembly is convenient.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The vacuum material extraction device for methyl chloroacetate production described in this utility model can drive a lifting beam from a high position to a low position via a lifting driver. As the lifting beam lowers, the suction gun is gradually inserted into the interior of the mobile raw material storage tank, so that the inlet of the suction gun moves to the bottom of the mobile raw material storage tank. The vacuum pump is turned on, and the raw materials for methyl chloroacetate production in the mobile raw material storage tank are transported to the reaction vessel through the suction gun, suction pipe, and vacuum feeder body via pneumatic conveying principle for methyl chloroacetate production. After extraction is completed, the lifting driver drives the suction gun to rise and reset. This device replaces the manual suction gun method used by workers, saving labor, increasing efficiency, and significantly improving work efficiency and safety.

[0021] The vacuum material extraction device for the production of methyl chloroacetate described in this utility model has a negative pressure resistant hose with high pressure resistance and flexibility to avoid cracking or air leakage due to bending or stretching when the suction gun is raised or lowered, and to avoid interference with the raising and lowering of the suction gun.

[0022] The vacuum material extraction device for the production of methyl chloroacetate described in this utility model can adjust the distance between the upper fixed plate and the telescopic beam by adjusting the positions of nuts A and B on the height fine-tuning screw. This allows for fine-tuning of the position of the suction gun relative to the lifting beam in the vertical direction, so that when the lifting beam is lowered to its lowest position, the suction port at the bottom of the suction gun can be as close as possible to the inner bottom of the mobile raw material storage tank, thus optimizing the material extraction effect. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. 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 to scale.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the lifting and adjusting mechanism of this utility model; Figure 3This is a schematic diagram of the position fine-tuning mechanism of this utility model; Figure 4 This is a schematic diagram of the structure of the present invention. Figure 2 ; In the diagram: 1. Reactor; 2. Vacuum feeder body; 3. Suction pipe; 3.1. Negative pressure resistant hose; 3.2. Horizontal pipe section; 4. Vacuum pipe; 5. Suction gun; 6. Vacuum pump; 7. Lifting driver; 8. Fixing plate; 9. Lifting beam; 10. Optical axis; 11. Sliding sleeve; 12. Pull rope sensor; 13. Mobile raw material storage tank; 14. Base; 15. Pipe clamp A; 16. Pipe clamp B; 17. Upper fixing plate; 18. Lower fixing plate; 19. Slide rail; 20. Slider; 21. Height fine adjustment screw; 22. Nut A; 23. Nut B; 24. Telescopic beam; 25. Horizontal fine adjustment screw; 26. Vertical fixing plate A; 27. Vertical fixing plate B; 28. Nut C; 29. ​​Nut D. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0026] Example 1, such as Figure 1-2As shown, the vacuum feeding device for the production of methyl chloroacetate includes a vacuum feeder body 2 installed on a reactor 1. The suction port of the vacuum feeder body 2 is connected to the suction gun 5 through a suction pipe 3. The exhaust port of the vacuum feeder body 2 is connected to a vacuum pump 6 through a vacuum pipe 4. It also includes a mobile raw material storage tank 13 that cooperates with the suction gun 5 and a lifting adjustment mechanism for driving the suction gun 5 to rise and fall. The lifting adjustment mechanism includes a vertically arranged lifting driver 7. A fixing plate 8 is fixed to the upper part of the cylinder of the lifting driver 7. A lifting crossbeam 9 is fixed to the telescopic end of the lifting driver 7. The front end of the lifting crossbeam 9 is fixedly connected to the suction gun 5. The tail end of the lifting crossbeam 9 is fixedly connected to the optical axis 10. A sliding sleeve 11 that cooperates with the optical axis 10 is provided on the fixing plate 8. When the mobile raw material storage tank 13 is positioned below the suction gun 5, the lifting driver 7 drives the lifting beam 9 from a high position to a low position. As the lifting beam 9 lowers, the suction gun 5 gradually inserts into the interior of the mobile raw material storage tank 13, moving the inlet of the suction gun 5 to the bottom of the tank. The vacuum pump 6 is then activated, and the raw material (chloroacetic acid or methanol) for methyl chloroacetate production in the mobile raw material storage tank 13 is transported via the suction gun 5, suction pipe 3, and vacuum feeder body 2 to the reaction vessel 1 for methyl chloroacetate production. After the material extraction is complete, the lifting driver 7 drives the suction gun 5 to rise and reset. This device replaces the manual suction gun method used by workers, saving labor, increasing efficiency, and significantly improving operational efficiency and safety. Each component can be individually processed and assembled, simplifying the assembly process. The simple structure reduces complex processing requirements and lowers manufacturing costs.

[0027] Example 2, as Figure 1-2 As shown, the vacuum feeding device for the production of methyl chloroacetate includes a vacuum feeder body 2 installed on a reactor 1. The suction port of the vacuum feeder body 2 is connected to the suction gun 5 through a suction pipe 3. The exhaust port of the vacuum feeder body 2 is connected to a vacuum pump 6 through a vacuum pipe 4. It also includes a mobile raw material storage tank 13 that cooperates with the suction gun 5 and a lifting adjustment mechanism for driving the suction gun 5 to rise and fall. The lifting adjustment mechanism includes a vertically arranged lifting driver 7. A fixing plate 8 is fixed to the upper part of the cylinder of the lifting driver 7. A lifting crossbeam 9 is fixed to the telescopic end of the lifting driver 7. The front end of the lifting crossbeam 9 is fixedly connected to the suction gun 5. The tail end of the lifting crossbeam 9 is fixedly connected to the optical axis 10. A sliding sleeve 11 that cooperates with the optical axis 10 is provided on the fixing plate 8.

[0028] Furthermore, the suction pipe 3 includes a negative pressure resistant hose 3.1 connected to the suction gun 5. The upper end of the negative pressure resistant hose 3.1 is connected to a horizontal pipe section 3.2, and the other end of the horizontal pipe section 3.2 is connected to the suction port of the vacuum feeder body 2. The negative pressure resistant hose 3.1 has high pressure resistance and flexibility to avoid breakage or air leakage due to bending or stretching when the suction gun is raised or lowered, thus avoiding interference with the raising and lowering of the suction gun 5.

[0029] Furthermore, the negative pressure resistant hose 3.1 is a plastic-reinforced spiral hose. The plastic-reinforced spiral structure, made of PVC or PU material, significantly improves the ring stiffness of the hose through the built-in rigid plastic ribs or steel wire reinforcement layer, and can withstand negative pressures of more than 0.8MPa, making it suitable for vacuum suction, high-pressure conveying and other scenarios.

[0030] Furthermore, the bottom end of the lifting drive 7 is fixed to the base 14. The fixation is secure.

[0031] Furthermore, the suction gun 5 is mounted on the lifting beam 9 via a position fine-tuning mechanism.

[0032] Furthermore, the lifting beam 9 is a hollow rectangular tubular structure.

[0033] Furthermore, referring to Figure 3 The position fine-tuning mechanism includes a pipe clamp A15 and a pipe clamp B16 fixed on the suction gun 5. An upper fixing plate 17 and a lower fixing plate 18 are respectively fixed on the pipe clamp A15 and the pipe clamp B16. A slide rail 19 and a height fine-tuning screw 21 are fixed between the upper fixing plate 17 and the lower fixing plate 18. The height fine-tuning screw 21 passes through the telescopic beam 24. The telescopic beam 24 is plugged into the lifting beam 9. Nuts A22 and B23 are threaded onto the height fine-tuning screws 21 on both sides of the telescopic beam 24. A slider 20 that slides in cooperation with the slide rail 19 is provided at the end of the telescopic beam 24. By adjusting the positions of nuts A22 and B23 on the height fine-tuning screw 21, the distance between the upper fixed plate 17 and the telescopic beam 24 can be adjusted, thereby fine-tuning the position of the suction gun 5 relative to the lifting beam 9 in the vertical direction. This ensures that when the lifting beam 9 is lowered to its lowest position, the suction port at the bottom of the suction gun 5 can be as close as possible to the inner bottom of the mobile raw material storage tank 13, thus optimizing the material extraction effect.

[0034] Furthermore, a vertical fixing plate B27 is fixed to the telescopic beam 24, and a horizontal fine-tuning screw 25 is provided on the vertical fixing plate B27. The horizontal fine-tuning screw 25 passes through the vertical fixing plate A26, and the vertical fixing plate A26 is fixed to the outer wall of the lifting beam 9. Nuts C28 and D29 are respectively provided on the horizontal fine-tuning screws 25 on both sides of the vertical fixing plate A26. By adjusting nuts C28 and D29, the depth of the telescopic beam 24 inserted into the lifting beam 9 is adjusted, changing the horizontal position of the suction gun 5 relative to the lifting beam 9, so that the suction gun 5 is inserted as close as possible to the center of the mobile raw material storage tank 13. Specifically, simultaneously rotating nuts C28 and D29 clockwise moves the vertical fixing plate B27 closer to the vertical fixing plate A26, and the telescopic beam 24 is further inserted into the lifting beam 9. After adjustment, nuts C28 and D29 are tightly attached to both sides of the vertical fixing plate A26 to prevent relative movement between the telescopic beam 24 and the lifting beam 9. Simultaneously rotating nuts C28 and D29 counterclockwise moves the vertical fixing plate B27 away from the vertical fixing plate A26, and the telescopic beam 24 is pulled out of the lifting beam 9. After adjustment, nuts C28 and D29 are tightly attached to both sides of the vertical fixing plate A26 to prevent relative movement between the telescopic beam 24 and the lifting beam 9.

[0035] Furthermore, the pipe clamp A15 includes a first half-clamp and a second half-clamp arranged opposite to each other. One end of the first half-clamp is detachably connected to one end of the second half-clamp via a locking bolt one, and the other end of the first half-clamp is detachably connected to the other end of the second half-clamp via a locking bolt two. The upper fixing plate 17 is welded to the second half-clamp. Disassembly is convenient.

[0036] Example 3, referring to Figure 4 The difference from Embodiment 2 is that a pull rope sensor 12 is fixed on the lifting drive 7, the pull wire of the pull rope sensor 12 is fixed on the lifting beam 9, the pull rope sensor 12 is electrically connected to the signal input terminal of the controller, the controller is electrically connected to the solenoid valve that controls the extension and retraction of the lifting drive 7, and the pull rope sensor 12 detects the distance change between the pull rope sensors 12 on the lifting beam 9, so as to achieve the purpose of accurately controlling the lifting beam 9 to rise and fall through the lifting drive 7.

[0037] The vacuum material extraction device for methyl chloroacetate production described in this utility model can drive a lifting beam from a high position to a low position via a lifting driver. As the lifting beam lowers, the suction gun is gradually inserted into the interior of the mobile raw material storage tank, so that the inlet of the suction gun moves to the bottom of the mobile raw material storage tank. The vacuum pump is turned on, and the raw materials for methyl chloroacetate production in the mobile raw material storage tank are transported to the reaction vessel through the suction gun, suction pipe, and vacuum feeder body via pneumatic conveying principle for methyl chloroacetate production. After extraction is completed, the lifting driver drives the suction gun to rise and reset. This device replaces the manual suction gun method used by workers, saving labor, increasing efficiency, and significantly improving work efficiency and safety.

[0038] The vacuum material extraction device for the production of methyl chloroacetate described in this utility model has a negative pressure resistant hose with high pressure resistance and flexibility to avoid cracking or air leakage due to bending or stretching when the suction gun is raised or lowered, and to avoid interference with the raising and lowering of the suction gun.

[0039] The vacuum material extraction device for the production of methyl chloroacetate described in this utility model can adjust the distance between the upper fixed plate and the telescopic beam by adjusting the positions of nuts A and B on the height fine-tuning screw. This allows for fine-tuning of the position of the suction gun relative to the lifting beam in the vertical direction, so that when the lifting beam is lowered to its lowest position, the suction port at the bottom of the suction gun can be as close as possible to the inner bottom of the mobile raw material storage tank, thus optimizing the material extraction effect.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0041] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A vacuum feeding device for the production of methyl chloroacetate, comprising a vacuum feeder body installed on a reactor, wherein the suction port of the vacuum feeder body is connected to a suction gun via a suction pipe, and the exhaust port of the vacuum feeder body is connected to a vacuum pump via a vacuum pipe, characterized in that: It also includes a mobile raw material storage tank that works with the suction gun and a lifting adjustment mechanism that drives the suction gun to rise and fall. The lifting adjustment mechanism includes a vertically arranged lifting driver. A fixed plate is fixed to the upper part of the cylinder of the lifting driver. A lifting beam is fixed to the telescopic end of the lifting driver. The front end of the lifting beam is fixedly connected to the suction gun. The rear end of the lifting beam is fixedly connected to the optical axis. A sliding sleeve that slides with the optical axis is provided on the fixed plate.

2. The vacuum material extraction device for the production of methyl chloroacetate according to claim 1, characterized in that, The suction pipe includes a negative pressure resistant hose connected to the suction gun. The upper end of the negative pressure resistant hose is connected to a horizontal pipe section, and the other end of the horizontal pipe section is connected to the suction port of the vacuum feeder body.

3. The vacuum material extraction device for the production of methyl chloroacetate according to claim 2, characterized in that, The negative pressure resistant hose is a plastic-reinforced spiral hose.

4. The vacuum material extraction device for the production of methyl chloroacetate according to claim 3, characterized in that, The bottom end of the lifting driver is fixed to the base.

5. The vacuum pumping device for the production of methyl chloroacetate according to claim 4, characterized in that, The suction gun is mounted on the lifting beam via a position fine-tuning mechanism.

6. The vacuum pumping device for the production of methyl chloroacetate according to claim 5, characterized in that, The lifting beam is a hollow rectangular tubular structure.

7. The vacuum pumping device for the production of methyl chloroacetate according to claim 6, characterized in that, The position fine-tuning mechanism includes a pipe clamp A and a pipe clamp B fixed on the suction gun. An upper fixing plate and a lower fixing plate are respectively fixed on the pipe clamp A and the lower fixing plate. A slide rail and a height fine-tuning screw are fixed between the upper fixing plate and the lower fixing plate. The height fine-tuning screw passes through the telescopic beam. The telescopic beam is plugged into the lifting crossbeam. Nuts A and B are threaded onto the height fine-tuning screws on both sides of the telescopic beam. A slider that slides with the slide rail is provided at the end of the telescopic beam.

8. The vacuum pumping device for the production of methyl chloroacetate according to claim 7, characterized in that, A vertical fixing plate B is fixed on the telescopic beam. A horizontal fine-tuning screw is provided on the vertical fixing plate B. The horizontal fine-tuning screw passes through the vertical fixing plate A. The vertical fixing plate A is fixed on the outer wall of the lifting beam. Nuts C and D are respectively provided on the horizontal fine-tuning screws on both sides of the vertical fixing plate A.

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