Methyl methacrylate recovery device and use method

Abstract

The invention relates to the technical field of chemical engineering, in particular to a methyl methacrylate recovery device and a using method.The methyl methacrylate recovery device comprises a chemical barrel and a barrel cover, the barrel cover is fixedly connected to the top end of the chemical barrel, a methyl methacrylate solution is stored in the chemical barrel, and the methyl methacrylate recovery device further comprises a supporting mechanism, a volume detection mechanism and a display mechanism; the supporting mechanisms are fixedly connected to the outer edge of the bottom of the lower surface of the chemical barrel at equal intervals in the circumferential direction. The volume detection mechanism is fixedly connected to the left end of the upper surface of the barrel cover; the display mechanism is mounted at the front end of the upper surface of the can cover; a base is vertically and fixedly connected to the lower surface of the chemical barrel, and a through hole is formed in the right side wall of the base. The device has a chemical barrel positioning function, collision between chemical barrels is prevented, fire or explosion is prevented, the purpose of accurate polymerization inhibition is achieved, a methyl methacrylate solution is prevented from losing efficacy, the storage date of methyl methacrylate is marked, and the methyl methacrylate solution is prevented from being stored beyond the expiration date.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, in particular to a methyl methacrylate recovery device and a use method thereof. Background Art

[0002] Methyl methacrylate (MMA), also known as methyl methacrylate, is an organic compound with the chemical formula C5H8O2. It is a colorless liquid, slightly soluble in water, and soluble in most organic solvents such as ethanol. It is mainly used as a monomer for organic glass, and is also used to manufacture other resins, plastics, coatings, adhesives, lubricants, wood and cork impregnation agents, paper polishes, etc. The storage conditions of methyl methacrylate include storage in a dry, clean, sealed container. The container material should be suitable for the storage of organic compounds, such as glass or stainless steel. In addition, the storage area should be away from fire sources, heat sources and direct sunlight to avoid decomposition caused by high temperature, which can reduce the purity and quality. Chemical barrels are used as recovery containers for methyl methacrylate. During the transportation of chemical barrels, they are often displaced due to the inertia of the transfer vehicle. Collisions occur between chemical barrels, and friction can cause the chemical barrels to heat up, posing a risk of fire or explosion. During the storage of methyl methacrylate, in order to prevent the polymerization of methyl methacrylate, it is necessary to add an inhibitor to the methyl methacrylate solution. However, since methyl methacrylate chemical barrels are light-proof chemical barrels, the addition of the inhibitor is not accurate enough, which can easily cause the methyl methacrylate to fail. In addition, the shelf life of methyl methacrylate is short. If the shelf life of methyl methacrylate cannot be recorded, it is very easy for methyl methacrylate to be overdue. Based on the outstanding problems caused by the properties of methyl methacrylate, it is necessary to propose a methyl methacrylate recovery device that can be reasonably stored. Summary of the invention

[0003] The purpose of the present invention is to solve the problems that the existing chemical barrel cannot be positioned, the polymerization inhibitor cannot be accurately added, and the methyl methacrylate is easily overstorable, and a methyl methacrylate recovery device and a use method are provided.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: a methyl methacrylate recovery device, comprising a chemical barrel and a barrel cover, wherein the barrel cover is fixedly connected to the top of the chemical barrel, and the methyl methacrylate solution is stored in the chemical barrel. The device also comprises a supporting mechanism, a volume detection mechanism and a display mechanism. The number of the supporting mechanisms is at least four, which are fixedly connected to the outer edge of the bottom of the lower surface of the chemical barrel at equal intervals along the circumferential direction; the volume detection mechanism is fixedly connected to the left end of the upper surface of the barrel cover; and the display mechanism is installed at the front end of the upper surface of the barrel cover.

[0005] Specifically, the purpose is to position the chemical barrel to prevent displacement during transportation. The supporting mechanism includes a base, a lifting column, a connecting rod, a negative pressure cylinder, a suction cup, a piston and a piston rod. The base is vertically fixedly connected to the lower surface of the chemical barrel, and a through hole is opened on the right side wall of the base; the lifting column can be slid up and down and inserted into the inner cavity of the base; one end of the connecting rod is installed on the top of the lifting column; the negative pressure cylinder is fixedly connected to the right side wall of the base; the suction cup is installed at the bottom end of the negative pressure cylinder; the piston can be slid up and down and inserted into the bottom end of the inner cavity of the negative pressure cylinder, the piston moves upward along the inner wall of the negative pressure cylinder, the air pressure in the negative pressure cylinder drops, and the suction cup is positioned; one end of the piston rod is installed on the top of the piston, and the other end of the piston rod is connected to the other end of the connecting rod.

[0006] Specifically, an exhaust valve is installed at the bottom end of the outer wall of the negative pressure cylinder.

[0007] Specifically, the purpose is to measure the volume of recovered methyl methacrylate to achieve accurate addition of inhibitors. The volume detection mechanism includes a detection box, a guide rod, a floating block, a dial, an annular groove, a magnetic strip, a slider, a first rotating shaft, a pointer, a first gear, a second rotating shaft, a second gear, a first connecting rod and a second connecting rod. The detection box is fixedly connected to the left end of the upper surface of the barrel cover; the guide rod is vertically installed at the left end of the lower surface of the detection box; the floating block can be slid up and down and sleeved on the outer wall of the guide rod, and the floating block can float on the liquid surface of the methyl methacrylate solution by its own buoyancy; the dial is embedded in the front of the detection box, and the dial is provided with a volume scale according to the volume of the chemical barrel; the annular groove is opened at The front of the detection box and the annular groove are located on the outside of the dial; the magnetic strip is embedded in the inner cavity of the annular groove; the slider is inserted in the inner cavity of the magnetic strip, and the slider and the magnetic strip are magnetically attracted to each other; the first rotating shaft is installed on the top of the inner cavity of the detection box through a bearing that can rotate around its own axis; the pointer and the first gear are respectively installed on the front and rear ends of the outer wall of the first rotating shaft; the second rotating shaft is installed on the bottom of the inner cavity of the detection box through a bearing that can rotate around its own axis; the second gear and the first connecting rod are respectively installed on the front and rear ends of the second rotating shaft, and the second gear is meshed with the first gear; one end of the second connecting rod is connected to the bottom end of the first connecting rod through a pin, and the other end of the second connecting rod is connected to the right end of the floating block through a pin.

[0008] Specifically, the bottom of the guide rod is located at the bottom end of the inner cavity of the chemical barrel.

[0009] Specifically, a transmission ratio between the first gear and the second gear is greater than 1.

[0010] Specifically, the purpose is to record the storage date and prevent the methyl methacrylate solution from being stored beyond the validity period. The display mechanism includes a display box, a display window, a support rod, a turntable, a worm wheel, a worm, a knob, a brake disc and a brake assembly. The display box is installed at the front end of the upper surface of the barrel cover, and a plurality of display windows are equidistantly provided on the upper surface of the display box from left to right; the support rod is installed horizontally at the center of the display box; the number of turntables is the same as the display windows, and they are installed on the outer wall of the support rod from left to right so that they can rotate around their own axes through bearings; the worm wheel is installed on the right side wall of the turntable; the worm is installed on the bottom of the front side of the display box so that it can rotate around its own axis through bearings in the front and rear directions, and the worm is meshed with the worm wheel; the knob and the brake disc are respectively installed at the front and rear ends of the worm, and the worm can be rotated by driving the knob to make the worm wheel drive the turntable to rotate; the brake assembly is installed at the bottom end of the rear side of the inner cavity of the display box, and the worm is braked by the cooperation of the brake assembly and the brake disc.

[0011] Specifically, the side wall of the turntable is provided with numbers 0-9 along the circumferential direction.

[0012] Specifically, the brake assembly includes a limit cylinder, a friction plate and a spring. The limit cylinder is installed at the bottom end of the rear side of the inner cavity of the display box. The friction plate and the spring are inserted into the inner cavity of the limit cylinder from front to back. Under the action of the spring elastic force, the friction plate is pushed to contact the brake disc to brake the worm.

[0013] A method for using a methyl methacrylate recovery device comprises the following steps: Step 1: Transfer of chemical barrels. Place the chemical barrels on the carrying equipment. The lifting column and the suction cup will contact the bottom of the carrying equipment first, causing the lifting column and the piston to move upward. The space formed by the negative pressure cylinder and the suction cup will gradually increase, and a negative pressure state will be formed in the negative pressure cylinder until the base supports the chemical barrels. The suction cups are attached to the bottom of the carrying equipment to prevent the chemical barrels from sliding sideways during transfer and avoid collisions between chemical barrels. Step 2: When the methyl methacrylate solution is recovered, the methyl methacrylate solution is poured into a chemical barrel. As the liquid level of the methyl methacrylate solution rises, the floating block gradually rises due to its own buoyancy. At the same time, the angle between the first connecting rod and the second connecting rod gradually decreases. The first connecting rod drives the second rotating shaft to rotate counterclockwise. Under the transmission of the second gear and the first gear, the first rotating shaft drives the pointer to rotate clockwise. The volume of the methyl methacrylate solution is read by the position of the pointer pointing to the dial. A polymerization inhibitor is added according to the volume of the methyl methacrylate to prevent the methyl methacrylate from being polymerized and failing, and the methyl methacrylate solution is stored. Step three, drive the worm to rotate clockwise or counterclockwise through the knob, rotate the turntable under the transmission of the worm and worm wheel, switch the numbers on the turntable until the numbers displayed in the display window can represent the storage date of the methyl methacrylate solution, push the friction plate to contact the brake disc under the action of the spring force, brake the worm, and mark the storage date of the methyl methacrylate solution.

[0014] The beneficial effects of the present invention are: 1. The present invention can make the lifting column and the piston rise at the same time through the connection of the connecting rod, so that the negative pressure cylinder reaches a negative pressure state, the suction cup sucks the bottom of the bearing device, the base supports the chemical barrel, and the suction cup can prevent the chemical barrel from being displaced due to inertia during transportation. Therefore, it has the function of positioning the chemical barrel, preventing collisions between chemical barrels, and preventing fire or explosion; 2. The floating block of the present invention rises as the liquid level of the methyl methacrylate solution rises, so that the angle between the first connecting rod and the second connecting rod becomes smaller. Under the rotation of the first gear and the second gear, the first rotating shaft drives the pointer to rotate clockwise, and the reading on the dial is read. According to the volume of methyl methacrylate, an appropriate amount of polymerization inhibitor is added to prevent the polymerization reaction of methyl methacrylate, thereby achieving the purpose of accurate polymerization inhibition and preventing the methyl methacrylate solution from failing; 3. The present invention drives the worm to rotate clockwise or counterclockwise through a knob, and the turntable rotates under the transmission of the worm and the worm wheel to perform digital switching. The friction plate contacts the brake disc under the push of the spring elastic force, and the rotating worm is braked to achieve the methyl methacrylate storage date marking, thereby preventing the methyl methacrylate solution from being stored beyond the validity period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the supporting mechanism structure of the present invention; Figure 3 It is a front cross-sectional view of the negative pressure cylinder of the present invention; Figure 4 It is a structural schematic diagram of the volume detection mechanism of the present invention; Figure 5 for Figure 4 A in the enlarged view; Figure 6 It is a right side cross-sectional view of the detection box of the present invention; Figure 7 It is a schematic diagram of the display mechanism structure of the present invention; Figure 8 It is a right side cross-sectional view of the display mechanism of the present invention.

[0016] In the figure: 1, chemical barrel; 2, barrel cover; 3, support mechanism; 4, volume detection mechanism; 5, display mechanism; 31, base; 32, through hole; 33, lifting column; 34, connecting rod; 35, negative pressure cylinder; 36, suction cup; 37, piston; 38, piston rod; 39, exhaust valve; 41, detection box; 42, guide rod; 43, floating block; 44, dial; 45, annular groove; 46, magnetic strip; 47, slider; 4 8. First rotating shaft; 49. Pointer; 410. First gear; 411. Second rotating shaft; 412. Second gear; 413. First connecting rod; 414. Second connecting rod; 51. Display box; 52. Display window; 53. Support rod; 54. Turntable; 55. Worm gear; 56. Worm; 57. Knob; 58. Brake disc; 59. Brake assembly; 591. Limiting cylinder; 592. Friction plate; 593. Spring. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the preferred implementation scheme of the present invention is further described below in conjunction with specific implementation schemes and accompanying drawings.

[0018] See also Figure 1-Figure 8 The present invention provides a methyl methacrylate recovery device, comprising a chemical barrel 1 and a barrel cover 2, the barrel cover 2 is fixedly connected to the top of the chemical barrel 1, the chemical barrel 1 is used to store methyl methacrylate solution, at least four supporting mechanisms 3 are fixedly connected to the outer side of the lower surface of the chemical barrel 1 at equal intervals along the circumferential direction, a volume detection mechanism 4 is fixedly connected to the left end of the upper surface of the barrel cover 2, and a display mechanism 5 is installed on the front end of the upper surface of the barrel cover 2; The supporting mechanism 3 includes a base 31 fixedly connected to the lower surface of the chemical barrel 1, a through hole 32 is opened on the right side wall of the base 31, a lifting column 33 capable of sliding up and down is inserted into the inner cavity of the base 31, one end of a connecting rod 34 is installed on the top of the lifting column 33, and a space for the connecting rod 34 to move up and down is provided through the through hole 32, a negative pressure cylinder 35 is fixedly connected to the right side wall of the base 31, a suction cup 36 is installed at the bottom of the negative pressure cylinder 35, the suction cup 36 is made of rubber and has a telescopic function, and the inner cavity of the negative pressure cylinder 35 is inserted There is a piston 37 that can slide up and down, and the top of the piston 37 is connected to the other end of the connecting rod 34. The connecting rod 34 can make the lifting column 33 and the piston 37 rise or fall synchronously. When the piston 37 rises, the bottom space of the negative pressure cylinder 35 expands, and negative pressure is formed in the negative pressure cylinder 35, so that the suction cup 36 sucks the bottom of the storage space to position the chemical barrel 1. The bottom end of the outer wall of the negative pressure cylinder 35 is installed with an exhaust valve 39. When the exhaust valve 39 is opened, gas enters the negative pressure cylinder 35, and the suction cup 36 no longer has suction; When transferring the chemical barrel 1, place the chemical barrel 1 on the carrying device, and the lifting column 33 and the suction cup 36 will contact the bottom of the carrying device first, prompting the lifting column 33 and the piston 37 to move upward, and the space formed by the negative pressure cylinder 35 and the suction cup 36 will gradually become larger, and a negative pressure state will be formed in the negative pressure cylinder 35 until the base 31 supports the chemical barrel 1, and the suction cup 36 is adsorbed on the bottom of the carrying device to prevent the chemical barrel 1 from sliding sideways during the transfer process and avoid collisions between chemical barrels 1.

[0019] As a preferred embodiment, further, the volume detection mechanism 4 includes a detection box 41 fixedly connected to the left end of the upper surface of the barrel cover 2, a guide rod 42 is vertically installed at the left end of the lower surface of the detection box 41, and a floating block 43 that can slide up and down is sleeved on the outer wall of the guide rod 42. The floating block 43 can float on the liquid surface of the methyl methacrylate solution by its own buoyancy. The bottom of the guide rod 42 contacts the bottom of the inner cavity of the chemical barrel 1 to ensure that the floating block 43 can drop to the bottom of the chemical barrel 1. A dial 44 is embedded in the front of the detection box 41, and a volume scale matching the volume of the chemical barrel 1 is provided on the dial 44 to facilitate the measurement of the volume of the methyl methacrylate solution in the chemical barrel 1. An annular groove 45 is provided on the front of the detection box 41, and a magnetic strip 46 is embedded in the inner cavity of the annular groove 45. A slider 47 that is magnetically attracted to the magnetic strip 46 is inserted in the annular groove 45, and a punctuation mark is provided on the front of the slider 47 for marking the scale of the dial 44. The top of the inner cavity of the detection box 41 is connected to the outer surface of the dial 44. A first rotating shaft 48 capable of rotating around its own axis is installed through a bearing, and a pointer 49 and a first gear 410 are installed at the front and rear ends of the first rotating shaft 48 respectively. A second rotating shaft 411 capable of rotating around its own axis is installed through a bearing along the front and rear directions at the bottom of the inner cavity of the detection box 41. A second gear 412 and one end of a first connecting rod 413 are installed at the front and rear ends of the second rotating shaft 411 respectively, and the second gear 412 is meshed and connected with the first gear 410. The transmission ratio of the first gear 410 and the second gear 412 is greater than 1, which increases the angular velocity of the first gear 410, amplifies the moving distance during volume measurement, and makes the volume measurement more accurate. One end of a second connecting rod 414 is installed at the other end of the first connecting rod 413 through a pin shaft, and the other end of the second connecting rod 414 is connected to the right end of the floating block 43 through a pin shaft. As the floating block 43 rises or falls, the angle between the first connecting rod 413 and the second connecting rod 414 becomes smaller or larger, thereby causing the second rotating shaft 411 to rotate counterclockwise or clockwise. When the methyl methacrylate solution is recovered, the methyl methacrylate solution is poured into the chemical barrel 1. As the liquid level of the methyl methacrylate solution rises, the floating block 43 gradually rises due to its own buoyancy. At the same time, the angle between the first connecting rod 413 and the second connecting rod 414 gradually decreases. The first connecting rod 413 drives the second rotating shaft 411 to rotate counterclockwise. Under the transmission of the second gear 412 and the first gear 410, the first rotating shaft 48 drives the pointer 49 to rotate clockwise. The volume of the methyl methacrylate solution is read by the pointer 49 pointing to the position of the dial 44. The polymerization inhibitor is added according to the volume of the methyl methacrylate to prevent the methyl methacrylate from being polymerized and failing, so as to preserve the methyl methacrylate solution. The slider 47 is moved to slide on the annular groove 45 to change the position of the dial 44 pointed by the slider 47, and the pointer 49 can be rotated again. When the methyl methacrylate solution is recovered in multiple times, the recovered volume of the methyl methacrylate solution can be repeatedly measured.

[0020] As a preferred solution, further, the display mechanism 5 includes a display box 51 installed on the front end of the upper surface of the barrel cover 2, and a plurality of display windows 52 are opened on the upper surface of the display box 51 at equal distances from left to right. A support rod 53 is installed horizontally at the center of the inner cavity of the display box 51, and a turntable 54 corresponding to the display window 52 is installed on the outer wall of the support rod 53 from left to right through a bearing, and ten numbers 0-9 are arranged on the side wall of the turntable 54 along the circumferential direction. The numbers are displayed through the display window 52 to realize the storage date marking of the methyl methacrylate solution. The turntable 54 A worm wheel 55 is installed on the right side wall. A worm 56 capable of rotating around its own axis is installed on the front side of the display box 51 from left to right along the front and rear direction through a bearing, and the worm 56 is meshed and connected with the worm wheel 55. A knob 57 and a brake disc 58 are installed at the front and rear ends of the worm 56 respectively. The worm 56 is driven to rotate by the knob 57. Under the transmission of the worm 56 and the worm wheel 55, the turntable 54 can rotate clockwise or counterclockwise. A brake assembly 59 is installed at the bottom end of the rear side of the inner cavity of the display box 51. The brake assembly 59 cooperates with the brake disc 58 to brake the worm 56. The brake assembly 59 includes a limit cylinder 591 fixedly connected to the bottom end of the rear side of the inner cavity of the display box 51. The front and rear ends of the inner cavity of the limit cylinder 591 are respectively plugged with a friction plate 592 and a spring 593. The friction plate 592 is pushed to contact the brake disc 58 under the elastic force of the spring 593 to brake the worm 56. The worm 56 is driven to rotate clockwise or counterclockwise by the knob 57, and the turntable 54 is rotated under the transmission of the worm 56 and the worm wheel 55, and the numbers on the turntable 54 are switched until the numbers displayed in the display window 52 can represent the storage date of the methyl methacrylate solution. Under the elastic force of the spring 593, the friction plate 592 is pushed to contact the brake disc 58, and the worm 56 is braked, so as to mark the storage date of the methyl methacrylate solution.

[0021] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A methyl methacrylate recovery device, comprising a chemical barrel (1) and a barrel cover (2), wherein the barrel cover (2) is fixedly connected to the top of the chemical barrel (1), and a methyl methacrylate solution is stored in the chemical barrel (1), characterized in that: The methyl methacrylate recovery device also includes: Support mechanisms (3), the number of which is at least four, fixedly connected to the outer edge of the bottom of the lower surface of the chemical barrel (1) at equal intervals along the circumferential direction; A volume detection mechanism (4) fixedly connected to the left end of the upper surface of the barrel cover (2); A display mechanism (5) mounted on the front end of the upper surface of the barrel cover (2); The supporting mechanism (3) comprises: A base (31) is vertically fixedly connected to the lower surface of the chemical barrel (1), and a through hole (32) is formed on the right side wall of the base (31); A lifting column (33) which is inserted into the inner cavity of the base (31) so as to be able to slide up and down; A connecting rod (34), one end of which is mounted on the top of the lifting column (33); A negative pressure cylinder (35) fixedly connected to the right side wall of the base (31); A suction cup (36) mounted on the bottom end of the negative pressure cylinder (35); The piston (37) is inserted into the bottom end of the inner cavity of the negative pressure cylinder (35) so as to be able to slide up and down. The piston (37) moves upward along the inner wall of the negative pressure cylinder (35), the air pressure in the negative pressure cylinder (35) decreases, and the suction cup (36) is positioned; One end of a piston rod (38) is mounted on the top end of the piston (37), and the other end of the piston rod (38) is connected to the other end of the connecting rod (34).

2. A methyl methacrylate recovery device according to claim 1, characterized in that: An exhaust valve (39) is installed at the bottom end of the outer wall of the negative pressure cylinder (35).

3. A methyl methacrylate recovery device according to claim 2, characterized in that: The volume detection mechanism (4) comprises: A detection box (41) fixedly connected to the left end of the upper surface of the barrel cover (2); A guide rod (42) vertically mounted on the left end of the lower surface of the detection box (41); A floating block (43) is sleeved on the outer wall of the guide rod (42) so as to be able to slide up and down, and the floating block (43) can float on the liquid surface of the methyl methacrylate solution by its own buoyancy; A dial (44) is embedded in the front of the detection box (41), and a volume scale is provided on the dial (44) according to the volume of the chemical barrel (1); An annular groove (45) is formed on the front side of the detection box (41), and the annular groove (45) is located outside the dial (44); A magnetic strip (46) embedded in the inner cavity of the annular groove (45); A slider (47) is inserted into the inner cavity of the magnetic strip (46), and the slider (47) and the magnetic strip (46) are magnetically attracted to each other; A first rotating shaft (48) is mounted on the top of the inner cavity of the detection box (41) via a bearing so as to be rotatable about its own axis; The pointer (49) and the first gear (410) are respectively mounted on the front and rear ends of the outer wall of the first rotating shaft (48); A second rotating shaft (411) is mounted on the bottom of the inner cavity of the detection box (41) via a bearing so as to be rotatable around its own axis; The second gear (412) and the first connecting rod (413) are respectively mounted on the front and rear ends of the second rotating shaft (411), and the second gear (412) is meshingly connected with the first gear (410); One end of the second connecting rod (414) is connected to the bottom end of the first connecting rod (413) through a pin, and the other end of the second connecting rod (414) is connected to the right end of the floating block (43) through a pin.

4. A methyl methacrylate recovery device according to claim 3, characterized in that: The bottom of the guide rod (42) is located at the bottom end of the inner cavity of the chemical barrel (1).

5. A methyl methacrylate recovery device according to claim 4, characterized in that: The transmission ratio between the first gear (410) and the second gear (412) is greater than 1.

6. A methyl methacrylate recovery device according to claim 5, characterized in that: The display mechanism (5) comprises: A display box (51) is mounted on the front end of the upper surface of the barrel cover (2), and a plurality of display windows (52) are provided on the upper surface of the display box (51) at equal intervals from left to right; A support rod (53) is installed transversely at the center of the display box (51); The number of turntables (54) is the same as that of the display windows (52), and they are mounted on the outer wall of the support rod (53) from left to right via bearings so as to be rotatable around their own axes; A worm gear (55) is mounted on the right side wall of the rotating disk (54); A worm (56) is mounted on the front bottom of the display box (51) via a bearing so as to be rotatable around its own axis in the front-rear direction, and the worm (56) is meshingly connected with the worm wheel (55); A knob (57) and a brake disc (58) are respectively mounted on the front and rear ends of the worm (56). The worm (56) is driven to rotate by the knob (57), so that the worm wheel (55) drives the rotating disc (54) to rotate; A brake assembly (59) is mounted on the bottom end of the rear side of the inner cavity of the display box (51), and the brake assembly (59) cooperates with the brake disc (58) to brake the worm (56).

7. A methyl methacrylate recovery device according to claim 6, characterized in that: The side wall of the rotating disk (54) is provided with numbers from 0 to 9 along the circumferential direction.

8. A methyl methacrylate recovery device according to claim 7, characterized in that: The brake assembly (59) comprises: A limiting cylinder (591) is mounted on the bottom end of the rear side of the inner cavity of the display box (51); The friction plate (592) and the spring (593) are inserted into the inner cavity of the limiting cylinder (591) from front to back, and the friction plate (592) is pushed to contact the brake disc (58) under the elastic force of the spring (593), thereby braking the worm (56).

9. The method for using a methyl methacrylate recovery device according to claim 8, characterized in that: The following steps are involved: Step 1: Transferring the chemical barrel (1). The chemical barrel (1) is placed on the carrying device. The lifting column (33) and the suction cup (36) are preferentially in contact with the bottom of the carrying device, so that the lifting column (33) and the piston (37) move upward. The space formed by the negative pressure cylinder (35) and the suction cup (36) gradually becomes larger, and a negative pressure state is formed in the negative pressure cylinder (35) until the base (31) supports the chemical barrel (1) and the suction cup (36) is adsorbed on the bottom of the carrying device to prevent the chemical barrel (1) from sliding sideways during the transfer process and avoid collision between chemical barrels (1). Step 2: When the methyl methacrylate solution is recovered, the methyl methacrylate solution is poured into the chemical barrel (1). As the liquid level of the methyl methacrylate solution rises, the float (43) gradually rises due to its own buoyancy. At the same time, the angle between the first connecting rod (413) and the second connecting rod (414) gradually decreases. The first connecting rod (413) drives the second rotating shaft (411) to rotate counterclockwise. Under the transmission of the second gear (412) and the first gear (410), the first rotating shaft (48) drives the pointer (49) to rotate clockwise. The volume of the methyl methacrylate solution is read by the pointer (49) pointing to the dial (44). A polymerization inhibitor is added according to the volume of the methyl methacrylate to prevent the methyl methacrylate from being polymerized and becoming ineffective, thereby storing the methyl methacrylate solution. Step 3, the worm (56) is driven to rotate clockwise or counterclockwise by the knob (57), and the turntable (54) is rotated under the transmission of the worm (56) and the worm wheel (55), and the numbers on the turntable (54) are switched until the numbers displayed in the display window (52) can represent the storage date of the methyl methacrylate solution, and the friction plate (592) is pushed to contact the brake disc (58) under the elastic force of the spring (593), so that the worm (56) is braked, and the storage date of the methyl methacrylate solution is marked.

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