Chemical vending machine

Abstract

To provide an automatic chemical vending machine in which, in the storing and selling process, an impact ignition source cannot be generated due to falling of articles, automatic management of storage and selling of dangerous chemicals is achieved, and a storage chamber therein can satisfy storage requirements for the dangerous chemicals.SOLUTION: An automatic chemical vending machine comprises a cabinet body, a cabinet door, a load sensor, an explosion-proof electric appliance box and a safety partition plate. Wherein the cabinet body is provided with a storage chamber, and the storage chamber is divided into a plurality of layers of storage grids by a built-in bearing plate; the cabinet door corresponds to the opening of the storage chamber; the load sensor is correspondingly arranged in the bearing plate below each storage grid; the explosion-proof electric appliance box is arranged at the upper end of the cabinet main body and is internally provided with an electric control device of the load sensor; a safety partition plate is further arranged between the explosive-proof electric appliance box and the storage chamber.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the field of chemical storage, and more particularly to chemical vending machines. [Background technology]

[0002] Hazardous chemicals are highly toxic and other chemicals that are toxic, corrosive, explosive, flammable, or flammable, and pose a risk to humans, facilities, and the environment. Hazardous chemical storage can be divided into large-scale warehouse storage within factories and small-scale storage in laboratories or vending cabinets. For easy access, vending cabinets with relatively large openings and capable of sorting and arranging chemicals are generally used for storage. These vending cabinets must be relatively safe. In particular, for some flammable and explosive hazardous chemicals, it is necessary to ensure easy access for users while avoiding the appearance of ignition sources within the space connected to the chemical vending machine. Common ignition sources include fire, heat from chemical reactions, thermal radiation, hot surfaces, friction, and impact. Exposure to high-current electrical components, static electricity from the human body, and violent collisions can all generate ignition sources with sufficient energy.

[0003] In the prior art, several explosion-proof hazardous chemical vending machines have been proposed. For example, Patent CN214964067U proposes a double-sided explosion-proof vending machine that includes a vending cabinet consisting of a housing, a front door, and a rear door, both of which are equipped with outlets, and the cabinet is equipped with multiple explosion-proof boxes in which electrical appliances are placed, and which automatically dispenses products using spring-loaded rails.

[0004] However, the spring-loaded rails may collide with the cabinet walls when dispensing products, and the various electrical appliances inside the cabinet (such as the heating unit, explosion-proof motor, and motor drive) are all installed in the same space as the hazardous chemicals, making them potential sources of ignition. Therefore, the chemical vending machines of the prior art do not meet the requirements for storing and selling hazardous chemicals, especially flammable and explosive hazardous chemicals. Summary of the Invention

[0005] SUMMARY OF THE INVENTION The object of the present invention is to provide a chemical vending machine that can realize automatic management of inventory and sales of hazardous chemicals, and whose internal storage chamber can meet the storage requirements of hazardous chemicals.

[0006] The chemical vending machine includes a cabinet body, a cabinet door, a load sensor, an explosion-proof appliance box, and a safety partition plate, wherein the cabinet body has a storage chamber, the storage chamber is divided by a built-in load plate to form multiple storage cells, the cabinet door is provided corresponding to the opening of the storage chamber, a load sensor is provided correspondingly within the load plate below each storage cell, the explosion-proof appliance box is located at the upper end of the cabinet body and has a built-in electronic control device connected to the load sensor, and a safety partition plate is further provided between the explosion-proof appliance box and the storage chamber.

[0007] According to the technical solution of the present invention, a user can directly open the cabinet door and take chemicals from the storage cells through the opening of the storage chamber. The weight value of the corresponding load sensor of the storage cell changes. The electronic control unit receives and counts the weight change information transmitted from the load sensor in the explosion-proof appliance cabinet, obtains the type and quantity of chemicals taken by the user, and updates the inventory of chemicals in the cabinet based on the taken quantity. The user can also obtain a chemical order form based on the change in the quantity of chemicals, thereby realizing automated management of chemical storage and sales. Furthermore, during the storage and sales process, the user directly takes the chemicals, eliminating the risk of impact ignition caused by falling items. Furthermore, because the electrical components are centrally located and completely separated from the storage chamber by a safety partition, even if the explosion-proof appliance cabinet fails to seal, the electrical components will not be exposed to the storage chamber and will not create a spark ignition source in the storage chamber. This meets the storage requirements for flammable and explosive hazardous chemicals and reduces safety risks during the storage and sales of hazardous chemicals.

[0008] In a preferred technical solution, the safety partition includes two layers of explosion-proof steel plates installed in parallel, and fire-proof cotton is filled between the explosion-proof steel plates.

[0009] According to this preferred technical solution, by installing two layers of explosion-proof steel plates arranged in parallel with each other and filled with fire-proof cotton between them, the explosion-proof appliance cabinet and the storage chamber can be securely isolated. Even if the sealing of the explosion-proof appliance cabinet is lost, an effective explosion prevention effect can be achieved, and the electrical components can be prevented from being directly exposed to the storage chamber, thereby improving the safety of the chemical vending machine.

[0010] In a preferred technical solution, the load sensor is an intrinsically safe electrical device, and the load sensor and the electronic control device are connected for communication via an explosion-proof cable.

[0011] According to this preferred technical solution, by adopting spark-free intrinsically safe electrical appliances and explosion-proof electrical cables, the risk of an ignition source occurring within the storage chamber can be further reduced, and the intrinsic safety of electrical appliances that are inevitably exposed within the storage chamber can be ensured.

[0012] As a preferred technical solution, the chemical vending machine further includes an explosion-proof electromagnetic lock installed on the edge of the cabinet door, and the explosion-proof electromagnetic lock further has a mechanical lock hole for manual unlocking.

[0013] According to this preferred technical solution, the electromagnetic lock receives a control command to control the cabinet door to automatically lock and unlock, thereby achieving automatic opening and closing of the cabinet door without manual assistance; and the cylinder of the explosion-proof electromagnetic lock further has a mechanical locking hole, which can be manually unlocked to unlock the chemical vending machine in an emergency such as a power outage or malfunction.

[0014] In a preferred technical solution, the cabinet door includes a first door body and a second door body that swing open on both sides, and in the closed position, a closing slit is formed between the two end faces of the first door body and the second door body that are away from the cabinet body, and a polymerized sheet that covers the closing slit is formed on the outer surface of the first door body and / or the inner surface of the second door body.

[0015] According to this preferred technical solution, a polymer sheet with a simple structure can cover the closing slit between the first door body and the second door body, and abut against the surface of the other cabinet door to form a serpentine Z-shaped slit, thereby improving the moisture resistance and leak prevention effects of the chemical vending machine.

[0016] As a preferred technical solution, the explosion-proof electromagnetic lock includes two cylinders respectively installed on the upper and lower edges of the first door body.

[0017] According to this preferred technical solution, the closing method is such that the polymeric sheets of the first door body and the second door body are pressed against each other, so that a stable locking effect can be achieved simply by locking the first door body, and by double-locking the first door body from above and below, the sealing performance of the cabinet door when closed can be further improved in accordance with the polymeric sheets.

[0018] In a preferred technical solution, the chemical vending machine further includes an explosion-proof proximity switch, which is disposed on a surface of the cabinet body corresponding to the cabinet door, and detects the distance between the surface of the cabinet body corresponding to the cabinet door and the cabinet door.

[0019] According to this preferred technical solution, when the load sensor detection value no longer changes, it is determined that the user's use is complete, and an explosion-proof proximity switch is used to detect the distance between the cabinet door and the cabinet body to confirm whether the cabinet door is properly closed. When the chemical vending machine is operated unmanned, it can be ensured that the cabinet door reaches the locking position and is locked closed every time a sale is completed.

[0020] In a preferred technical solution, the chemical vending machine further includes a metal handle and a grounding wire, and the cabinet door surface has an insulating and anticorrosive layer. The metal handle and the cabinet door surface have corresponding through-holes, and a metal screw penetrates the insulating and anticorrosive layer and is fastened to the through-hole. One end of the grounding wire is connected to the tip of the metal screw, and the other end is connected to the ground end of the explosion-proof appliance cabinet.

[0021] According to this preferred technical solution, the static electricity dissipation path in a chemical vending machine is as follows: when a person holds the metal handle, static electricity is transferred to the metal handle by the person's hand, then conducted by the metal screw of the metal handle, through the insulating anticorrosion layer into the cabinet door, and then transferred to the grounding end of the explosion-proof appliance cabinet by the grounding conductor in the cabinet door. In this way, static electricity can be first dissipated from the person's body every time the chemical vending machine is opened, which better prevents static electricity accumulation on the person's body from forming an ignition source and causing a fire or explosion. Furthermore, because static electricity can be dissipated through the structure of the chemical vending machine itself, there is no need to install a separate static electricity dissipation device, making the structure simpler and more convenient.

[0022] In a preferred technical solution, the chemical vending machine further comprises a hollow tube, one end of which passes through the surface of the cabinet door and is hinged to the cabinet door, and the other end of which is movably installed in the position limiting groove, and the position limiting groove opens on the surface of the explosion-proof appliance cabinet facing the user.

[0023] According to this preferred technical solution, the hollow tube can limit the opening position of the cabinet door, preventing the cabinet door from colliding with adjacent storage cabinets or other objects due to excessive rotation when opening, reducing the risk of ignition caused by the impact of the cabinet door colliding. At the same time, the hollow tube can also pass electrical wires through it, preventing them from being bent and damaged during the opening and closing process of the cabinet door. Furthermore, the hollow tube separates the electrical wires from the storage chamber, improving the safety of the chemical vending machine.

[0024] In a preferred technical solution, the chemical vending machine further includes a drain slot, an inspection hatch is opened above the explosion-proof electrical appliance box, an inspection cap is provided corresponding to the inspection hatch, there is a gap between the inspection cap and the inspection hatch, and the drain slot is provided below the gap.

[0025] According to this preferred technical solution, the chemical vending machine has a drain slot correspondingly arranged below the gap between the inspection cap and the inspection hatch, which can block and straighten the liquid that seeps in through the gap, making it easier for users to inspect and maintain the electrical components in the explosion-proof electrical appliance case, and preventing liquid from directly seeping into the explosion-proof electrical appliance case and causing damage to the electrical appliances. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic diagram of the overall structure of a chemical vending machine provided in an embodiment of the present invention; FIG. [Figure 2] 1 is a rear perspective view of the internal structure of a chemical vending machine provided in an embodiment of the present invention; FIG. [Figure 3] FIG. 1 is a top view of a chemical vending machine provided in an embodiment of the present invention with the cabinet door in a closed position. [Figure 4] FIG. 2 is a structural schematic diagram of an explosion-proof electromagnetic lock of a chemical vending machine provided in an embodiment of the present invention. [Figure 5] 1 is a schematic diagram of the rear structure of a metal handle provided in an embodiment of the present invention; FIG. [Figure 6] 1 is a partial structural schematic diagram of a chemical vending machine provided in an embodiment of the present invention; FIG. [Figure 7] 1 is a top perspective structural schematic diagram of a chemical vending machine provided in an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in accordance with the drawings in the embodiments of the present invention, and it is clear that the described embodiments are only some of the embodiments of the present invention, and do not include all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0028] In the description of the present invention, terms indicating positional relationships such as "center," "upper," "lower," "left," "right," "front," and "rear" are based on the directions or positional relationships shown in the drawings, where "front" refers to the direction toward the user and "rear" refers to the direction away from the user. However, these are merely terms used to enable those skilled in the art to more clearly understand the present invention, and are not intended to indicate or suggest that a device or component must necessarily have a specific orientation or be constructed and operated in a specific orientation, and do not constitute a limitation on the present invention.

[0029] First embodiment Fig. 1 is a schematic diagram of the overall structure of a chemical vending machine provided in an embodiment of the present invention. Fig. 2 is a schematic diagram of the internal structure of a chemical vending machine provided in an embodiment of the present invention, viewed from the rear. Referring to Figs. 1 and 2, the chemical vending machine includes a cabinet body 1, a cabinet door 2, a load sensor 3, an explosion-proof appliance box 4, and a safety partition plate 5.

[0030] Here, the cabinet body 1 may be formed as a storage cabinet of any shape. Taking FIG. 1 as an example, the cabinet body 1 may be a rectangular explosion-proof frame structure. For example, the outer frame of the cabinet body 1 may be an explosion-proof case made of double explosion-proof steel plate with a thickness of 1.2 mm and filled with fire-proof cotton with a thickness of 40 mm. A cavity is formed by being surrounded by the outer frame, and an explosion-proof electrical appliance box 4 is fitted into the upper part of the cavity, and the lower part is formed as a storage chamber 11, with the two separated by a safety partition plate 5. The storage chamber 11 may be a semi-closed chamber, with an open opening on the front (facing the user) side. Preferably, the side wall of the storage chamber 11 is further provided with an automatically openable vent 13, which can be controlled to open or close according to the storage requirements of different hazardous chemicals. A load plate 12 is provided within the storage chamber 11, which divides the space within the storage chamber 11 into multiple layers of storage cells. Preferably, each layer of storage cells further has a guard plate 14 vertically provided on the load plate 12, thereby dividing each layer into more storage cells, and each storage cell can be used to store multiple chemicals of the same type, one behind the other, making it easier for users to quickly find the chemicals they need.

[0031] The cabinet door 2 is provided corresponding to the opening of the storage chamber 11, and the cabinet door 2 can be a door body that can freely open and close the opening of the storage chamber 11, such as a double door body, a sliding door body, or a single flip door body. The door body of the cabinet door 2 is generally made of metal, but cabinet doors 2 made of other materials also fall within the scope of protection of the present invention. Preferably, referring to FIG. 1 as an example, the cabinet door 2 can include a door body 21 and an explosion-proof panel 22. The outer and inner surfaces of the door body 21 are respectively covered with the explosion-proof panel 22 having a certain thickness. The interior of the door body 21 is formed as a lightening cavity with a support frame, and the lightening cavity can be filled with fire-proof cotton, which ensures the strength and explosion-proof performance of the door body and reduces the weight of the door body, making it more lightweight.

[0032] The load sensors 3 are installed inside the load plates 12 corresponding to the storage cells. For example, if two storage cells are separated by a guard plate 14 on each layer of the load plates 12, two load sensors 3 are installed on the load plates 12 of that layer corresponding to the two storage cells. Here, the detection positions of the load sensors 3 correspond to the arrangement positions of the chemicals in the storage cells. That is, the chemicals may be arranged in a front-to-back order within the storage cells. In this case, the detection positions of the load sensors 3 corresponding to the storage cells should include the front-to-back arrangement positions of the chemicals so that statistics can be performed on all the chemicals arranged in the storage cells and the quantity of chemicals in the storage cells can be counted based on weight changes. Preferably, the load sensors 3 are intrinsically safe electrical devices, and the load sensors 3 and an electronic control unit (not shown) are connected to each other via an explosion-proof electrical cable. The use of intrinsically safe electrical devices and an explosion-proof electrical cable that do not generate sparks even with low current further reduces the risk of ignition sources occurring within the storage chamber 11 and ensures the intrinsic safety of electrical components that must be installed within the storage chamber 11.

[0033] The explosion-proof appliance box 4 is provided at the top of the cabinet body 1. Specifically, the explosion-proof appliance box 4 may be a box with an open top, which is fitted and attached from the top of the cabinet body 1, thereby sealingly isolating the explosion-proof appliance box 4 from the storage chamber 11 below. Preferably, the explosion-proof appliance box 4 used in the present invention has a box wall thickness of 5 mm or more to have excellent explosion isolation performance.

[0034] In particular, a safety partition plate 5 is further provided between the explosion-proof appliance box 4 and the storage chamber 11. The safety partition plate 5 may be any partition material with explosion-proof properties, and in this embodiment, preferably, two layers of explosion-proof steel plate are installed parallel to each other with fire-proof cotton filled between them. This further separates the explosion-proof appliance box 4 from the storage chamber 11, providing effective explosion protection even if the explosion-proof appliance box is no longer sealed, preventing electrical components such as the electronic control device of the load sensor 3 from being exposed to the storage chamber 11, thereby improving the safety of the chemical vending machine.

[0035] In this embodiment, a user can directly open the cabinet door 2 and remove chemicals from the storage cells through the opening of the storage chamber 11. The weight value of the corresponding load sensor 3 for the storage cell changes. The electronic control unit receives and counts the weight change information transmitted from the load sensor 3 in the explosion-proof appliance cabinet 4, obtains the type and quantity of chemicals the user has removed, and updates the inventory of chemicals in the cabinet based on the removed quantity. The user can also obtain a chemical order form based on the change in the quantity of chemicals, thereby achieving automated management of chemical storage and sales. Furthermore, since the user directly removes chemicals during the storage and sales process, there is no risk of an impact ignition source due to falling items. Furthermore, because the electrical components are centrally located and completely separated from the storage chamber 11 by the safety partition plate 5, even if a sealing failure occurs in the explosion-proof appliance cabinet 4, the electrical components will not be exposed to the storage chamber 11, and a spark ignition source will not occur in the storage chamber 11. Therefore, the storage requirements for flammable and explosive dangerous chemicals can be met, and the safety risks during the storage and sale of dangerous chemicals can be reduced.

[0036] Second embodiment A second embodiment of the present invention provides a chemical vending machine capable of controlling automatic opening and closing of the cabinet door 2 based on the chemical vending machine of the above embodiment.

[0037] FIG. 3 is a top view of a cabinet door provided in this embodiment. Please refer to FIGS. 1 and 3 together. The cabinet door 2 is a double-hinged door consisting of a first door body 23 and a second door body 24. In the closed position, a closing slit 25 is formed between the two closing end faces of the first door body 23 and the second door body 24 that are farther from the cabinet body 1. A polymerized sheet (first polymerized sheet 231 and / or second polymerized sheet 241) covering the closing slit 25 is formed on the outer surface of the first door body 23 and / or the inner surface of the second door body 24. Here, an example will be described in which the cabinet door 2 includes both the first polymerized sheet 231 and the second polymerized sheet 241. Preferably, the first polymerized sheet 231 may be formed by extension of the explosion-proof panel 22 on the outer surface of the first door body 23, or the second polymerized sheet 241 may be formed by extension of the explosion-proof panel 22 on the inner surface of the second door body 24. Specifically, because the width of the explosion-proof panel 22 on the outer surface of the first door body 23 is greater than the width of the door body 21 of the first door body 23, the explosion-proof panel 22 on the outer surface of the first door body 23 extends from the closing end face of the door body 21 to form a first polymer sheet 231 that overlaps and abuts against the outer surface of the second door body 24. Similarly, because the width of the explosion-proof panel 22 on the inner surface of the second door body 24 is also greater than the width of the door body 21, the explosion-proof panel 22 on the inner surface of the second door body 24 extends from the closing end face of the door body 21 to form a second polymer sheet 241 that overlaps and abuts against the inner surface of the first door body 23. The installation structure of the polymer sheet is simple, and the polymer sheet formed integrally with the explosion-proof panel 22 is strong, providing better explosion protection. Furthermore, the first polymer sheet 231 and the second polymer sheet 241 cover the closing slit 25 and can abut against the surface of the other cabinet door 2, thereby improving the moisture resistance and leak prevention of the chemical vending machine.

[0038] Preferably, a seal gasket 26 is further provided on the surface of the first polymer sheet 231 and / or the second polymer sheet 241 corresponding to the closing slit 25, and when the first door body 23 and the second door body 24 are closed, the first polymer sheet 231 covers the side of the closing slit 25 facing the user, and the inner surface of the first polymer sheet 231 is in close contact with the outer surface of one closing end of the second door body 24, and the second polymer sheet 241 covers the side of the closing slit 25 away from the user, and the second polymer sheet 241 is in close contact with the outer surface of one closing end of the first door body 23. In order to closely fit the inner surface of the end, the sealing gasket 26 may preferably be provided on the surface of one end of the first polymer sheet 231 and / or the second polymer sheet 241 away from the first door body 23 or the second door body 24, i.e., the sealing gasket 26 is provided on one end of the first polymer sheet 231 and / or the second polymer sheet 241 beyond the closing slit 25, thereby further sealing the closing slit between the first polymer sheet 231 and / or the second polymer sheet 241 and the surface of the cabinet door 2.

[0039] In a preferred embodiment of the present invention, the length of the door bodies 21 of the first door body 23 and the second door body 24 is the same as the length of the opening of the storage chamber 11, but the length of the explosion-proof panels 22 on the outer surfaces of the first door body 23 and the second door body 24 is greater than the length of the opening of the storage chamber 11. When the door body 21 is matched and fitted into the opening of the storage chamber 11, the upper and lower edges of the explosion-proof panels 22 on the outer surface of the door body 21 both protrude into the opening of the storage chamber 11 and come into close contact with the surfaces of the cabinet body 1 above and below the opening of the storage chamber 11, thereby covering the slit between the door body 21 and the opening of the storage chamber 11, and further preventing gas from leaking through the slit between the door body 21 and the opening of the storage chamber 11, thereby improving the sealing performance of the chemical vending machine.

[0040] Figure 4 is a structural schematic diagram of the explosion-proof electromagnetic lock of a chemical vending machine provided in this embodiment. As can be seen by referring to Figures 1, 3, and 4, the explosion-proof electromagnetic lock 6 may include a cylinder 61, a control device, and a power supply, of which the power supply may be integrated with the control device, or may be provided as two separate electrical appliances. The power supply may also be an external power supply provided outside the chemical vending machine, and is not limited thereto. The cylinder 61 of the explosion-proof electromagnetic lock 6 may be a commercially available cylinder; here, a cylinder with a retractable bolt 611 is used as an example. The cylinder 61 of the explosion-proof electromagnetic lock 6 may be mounted on the edge of the cabinet door 2, and the cylinder 61 extends and retracts a bolt 611 from the edge of the door body, thereby forming a locking groove 18 on the inner wall of the storage chamber 11 into which the bolt 611 fits. In particular, the cylinder 61 is communicatively connected to a control device and can receive control commands from the control device to automatically lock and unlock the cabinet door 2. That is, upon receiving a lock command from the control device, the bolt 611 extends into the locking groove 18 to lock the cabinet door 2, and upon receiving an unlock command from the control device, the bolt 611 retracts and unlocks, thereby automatically opening and closing the cabinet door 2 without manual assistance. At the same time, the cylinder 61 of the explosion-proof electromagnetic lock 6 may further include a mechanical locking hole 612, which can be manually unlocked to unlock the chemical vending machine in an emergency such as a power outage or malfunction. Preferably, the cylinder 61 of the explosion-proof electromagnetic lock 6 is housed in a hollowed-out cavity in the door body 21 , and the mechanical lock hole 612 may be provided so as to protrude from the surface of the cabinet door 2 .In this embodiment, in accordance with the double-door cabinet door 2 of this embodiment, the explosion-proof electromagnetic lock 6 may include two cylinders 61 respectively installed at the upper and lower edges of the cutout cavity of the first door body 23. A stable locking effect can be achieved simply by locking the first door body 23 through a closing method in which the first polymer sheet 231 and the second polymer sheet 241 are pressed against each other. However, double locking from the top and bottom of the first door body 23 can further improve the sealing performance of the cabinet door 2 when closed in accordance with the polymer sheets. Furthermore, the power supply conductor can be directly connected to the explosion-proof electromagnetic lock 6 within the cutout cavity without being exposed on the surface of the cabinet door 2. Furthermore, the mechanical locking hole 612 protrudes from the surface of the cabinet door 2, making it easier for the user to manually unlock the door.

[0041] In addition, the control device and power supply of the explosion-proof electromagnetic lock 6 may be integrally formed and installed in the explosion-proof electrical appliance box 4, or may be independent electrical components. In a preferred embodiment, the control device and power supply are both installed in the explosion-proof electrical appliance box 4, which allows for better integration of the electrical appliances, makes the structure compact, and ensures the separation between the electrical appliances and the storage chamber 11 even within the explosion-proof electrical appliance box 4. In other preferred embodiments, the front wall and both left and right side walls of the explosion-proof appliance cabinet 4 have openings through which conductors can pass. For example, in some embodiments, a position limiting groove 41 is opened in the front wall of the explosion-proof appliance cabinet 4, and the conductors connected to the cylinders in the cabinet door 2 can enter the explosion-proof appliance cabinet 4 through the position limiting groove 41 in the front wall of the explosion-proof appliance cabinet 4. The conductors in the explosion-proof appliance cabinet 4 are led directly to the outside of the cabinet body 1 through the conductor holes 15 in the both left and right side walls. Therefore, an external power supply may be used for the explosion-proof electromagnetic lock 6, and the conductors between the control device and the external power supply may be connected through the conductor holes 15. In order to reduce costs, the external power supply may use electrical components with a low explosion-proof level. The conductors between the two do not need to pass through the storage chamber 11, but the separation between the electrical components and the storage chamber 11 can be maintained, and dangerous situations such as fires and explosions due to communication between the space where the electrical components are located and the storage chamber 11 can be avoided.

[0042] In addition, the chemical vending machine in this embodiment further has an explosion-proof proximity switch 16, which is installed on the surface of the cabinet body 1 on the side corresponding to the cabinet door 2, and can detect the distance between the surface of the cabinet body 1 on the side corresponding to the cabinet door 2 and the cabinet door 2. That is, when the detection value of the load sensor 3 stops changing, it is determined that the user's use is complete, and by further detecting the distance between the cabinet door 2 and the cabinet body 1 using the explosion-proof proximity switch 16, it can be confirmed whether the cabinet door 2 is properly closed. When the chemical vending machine is operated unmanned, it can be ensured that the cabinet door 2 reaches the locking position and is locked closed each time a sale is completed.

[0043] Third embodiment The third embodiment of the present invention is based on the chemical vending machine in the above embodiment and provides a chemical vending machine that can discharge static electricity carried by the human body before the user opens the cabinet door 2.

[0044] As shown in Figure 1, a metal handle 7 is provided on the outer surface of the cabinet door 2 of the chemical vending machine. The metal handle 7 includes a grip portion 71 facing the user and capable of being grasped by a human hand, and a fixing portion 72 at one end of the metal handle 7 facing away from the user, which has a mounting structure for fixing the metal handle 7 to the cabinet door 2. In particular, in this embodiment, the fixing portion 72 of the metal handle 7 and the surface of the cabinet door 2 have corresponding fixing holes 73 through which metal screws are fastened to the fixing holes 73 through the insulating and corrosion-resistant layer of the cabinet door 2. One end of a grounding conductor is connected to the tip of the metal screw, and the other end is connected to the grounding end of the explosion-proof appliance cabinet. Specifically, the insulating and corrosion-resistant layer can cover the entire surface of the cabinet door 2 except for the area corresponding to the fixing holes 73 of the metal handle 7. This ensures the insulating and corrosion-resistant effect of the cabinet door 2 and allows the metal handle 7 to pass through the fixing holes 73 with the metal screws to directly contact the cabinet door 2 for electrical conductivity. The metal screw penetrates the explosion-proof panel 22 of the door body 21 and enters the hollow cavity of the door body 21, and can then be connected to the grounding conductor within the hollow cavity. Preferably, an insulating and anticorrosive layer is applied to the outer surface of the metal handle 7 other than the grip portion 71, thereby ensuring the electrostatic conductivity of the metal handle 7 and preventing corrosion of the metal handle 7.

[0045] In this embodiment, the static electricity dissipation path in the chemical vending machine is as follows: when a person grips metal handle 7, static electricity is transferred to metal handle 7 by the person's hand, then transmitted by the metal screw of metal handle 7 through the insulating and corrosion-resistant layer to the grounding conductor inside cabinet door 2, and then transferred via the grounding conductor to the ground end (not shown) of explosion-proof appliance case 4. The grounding end may be a grounded conductor structure or a grounding conductor inside explosion-proof appliance case 4, but this is not limited thereto. In this way, static electricity can be first dissipated from the human body every time the chemical vending machine is opened, which better prevents static electricity accumulation on the human body from forming an ignition source and causing a fire or explosion. Furthermore, because static electricity can be dissipated within the structure of the chemical vending machine itself, there is no need to install a separate static electricity dissipation device, making the structure simpler and more convenient.

[0046] FIG. 5 is a schematic diagram of the rear structure of a metal handle 7 provided in an embodiment of the present invention. Referring to FIGS. 1 and 5 together, the fixing portion 72 of the metal handle 7 of the chemical vending machine of this embodiment may have a rectangular airtight cavity structure, and has a parallel handle mounting surface (the surface facing the user) and a cabinet door mounting surface 74 (i.e., the rear surface of the metal handle 7). The grip portion 71 is formed as a hidden handle that is fitted into the handle mounting surface. The cabinet door mounting surface 74 is in close contact with the cabinet door 2 and has corresponding fixing holes 73 that penetrate through it. Metal screws can be fastened by penetrating the cabinet door mounting surface 74 and the surface of the cabinet door 2. Preferably, four fixing holes 73 are formed at each of the four corners of the cabinet door mounting surface 74 of the fixing portion 72, thereby improving the stability of the fixing structure between the metal handle 7 and the cabinet door 2.

[0047] In this embodiment, based on the structure of the metal handle 7, the bit of the metal screw can be installed in the cavity of the fixing part 72. Therefore, after the installation of the metal handle 7 is completed, there is no need to separate the bit of the metal screw for painting, and the outer surface of the fixing part 72 of the metal handle 7 can be painted directly. In addition, the outer surface of the metal handle 7 can be formed into a single flat surface, which improves the aesthetics.

[0048] Fourth embodiment The fourth embodiment of the present invention provides a chemical vending machine based on the second or third embodiment, which can protect and separate the conductors between the cabinet door 2 and the explosion-proof electrical appliance box 4.

[0049] Figure 6 is a schematic diagram of a partial structure of a chemical vending machine provided in this embodiment. Referring to Figures 1 and 6 together, a hollow pipe 8 is further provided between the cabinet door 2 and the cabinet body 1 of the chemical vending machine. The hollow pipe 8 may be any tubular structure with a through passage, such as the hollow circular pipe structure shown in Figure 6, or may have other shapes such as a hollow cone or hollow square pipe, all of which are applicable to the present invention. One end of the hollow pipe 8 is hingedly connected to the cabinet door 2, and the other end is connected within the position limiting groove 41 of the cabinet body 1 and is movable along the position limiting groove 41. Specifically, the limiting groove 41 may have an open end 41b and a closed end 41a, with the open end 41b adjacent to the cabinet door 2 and the closed end 41a distant from the cabinet door 2. When the cabinet door 2 is closed, the flameproof hollow tube 8 is located at the closed end 41a and is in a folded state adjacent to the side wall of the explosion-proof appliance cabinet 4. When the cabinet door 2 is opened, the hollow tube 8 moves to the open end 41b within the limiting groove 41, changing from the folded state to a supporting state, and the first door body 23 rotates open around the hinged edge. When the hollow tube 8 is located at the open end 41b, the hollow tube 8 is supported by the cabinet door 2 and the side wall of the explosion-proof appliance cabinet 4, preventing the cabinet door 2 from opening any further. Preferably, when the hollow tube 8 is located at the open end 41b, the angle between the inner surface of the cabinet door 2 and the surface on which the limiting groove 41 is located is 60°-100°. This allows the hollow tube 8 to act as a stopper, preventing the cabinet door 2 from colliding with an adjacent storage cabinet or other object due to excessive reversal when opened, thereby reducing the risk of an ignition source being generated by the impact caused by the cabinet door 2 colliding.

[0050] In particular, the conductors of the electrical devices in the cabinet door 2 can be electrically connected to the electrical appliances in the explosion-proof appliance box 4 after passing through the hollow tube 8. For example, in some preferred embodiments, the power supply for the explosion-proof electromagnetic lock 6 is provided in the explosion-proof appliance box 4, and the connecting conductor between the cylinder 61 and the power supply passes through the hollow tube 8. In other preferred embodiments, the grounding conductor connected to the metal screw of the metal handle 7 also passes through the hollow tube 8 to connect to the ground end of the explosion-proof appliance box 4. This prevents the conductors from being bent and damaged during the opening and closing of the cabinet door 2, and the hollow tube 8 helps to separate the conductors from the storage chamber, improving the safety of the chemical vending machine.

[0051] Fifth embodiment The fifth embodiment of the present invention provides a chemical vending machine that can better guarantee the safe operation of electrical components in the explosion-proof electrical appliance case 4, based on any of the above embodiments.

[0052] FIG. 7 is a schematic diagram of a chemical vending machine provided in this embodiment, viewed from above. As shown in FIG. 7, the explosion-proof appliance box 4 further includes an inspection hatch 42, which is covered by an inspection cap 43 that matches the shape of the inspection hatch 42. The inspection hatch 42 and the inspection cap 43 are both located at one end of the cabinet body 1 away from the storage chamber 11, i.e., at the top of the cabinet body 1, thereby further preventing the explosion-proof appliance box 4 from communicating with the storage chamber 11. Note that the inspection cap 43 may be any lid structure that can control the opening and closing of the inspection hatch 42, such as a flip-off cap, a sliding cap, a telescopic cap, etc., but this is not limited thereto. In the closed position, even if the edge of the inspection cap 43 matches the shape and size of the edge of the inspection hatch 42 and fits snugly, it is difficult to completely seal the inspection cap 43 and the inspection hatch 42 due to the gap that results from the fit. Furthermore, in order to separate the explosion-proof electrical appliance box 4 from the storage chamber 11, the inspection hatch 42 must be located away from the storage chamber 11, i.e., at the top of the cabinet body 1. Therefore, in the event of rainfall, snowfall, etc., liquids such as rainwater are likely to seep in through the gap (not shown) between the inspection cap 43 and the inspection hatch 42.

[0053] In this embodiment, the chemical vending machine further includes a drain slot 44 correspondingly disposed below the gap between the inspection cap 43 and the inspection hatch 42. The drain slot 44 has a groove structure with both sides higher than the center, and the depth and size of the groove are not limited thereto. By providing the drain slot 44 below the gap between the inspection cap 43 and the inspection hatch 42, it is possible to block and straighten any liquid that may seep in through the gap, thereby preventing liquid from directly seeping into the explosion-proof appliance case 4 and causing damage to the appliance.

[0054] Here, "below" may be directly below or may be slightly offset, and either is within the scope of protection of the present invention as long as it is ensured that the groove opening and the gap correspond to each other.

[0055] In a preferred embodiment, the inspection cap 43 is attached to the cabinet body 1 with its long side hinged to the long side of the inspection hatch 42, allowing a user to use a handle on the inspection cap 43 to pull up one side of the inspection cap 43 and flip it open, thereby achieving convenient opening and closing of the inspection cap 43 and the inspection hatch 42. Corresponding to the inspection cap 43 and the inspection hatch 42, the drain slot 44 is formed as an endless groove structure with a shape corresponding to the edge of the inspection hatch 42. For example, for a rectangular inspection hatch 42, the drain slot 44 is formed as an endless rectangular groove surrounding the edge of the inspection hatch 42 to receive any liquid that seeps in through the annular gap between the inspection hatch 42 and the inspection cap 43. The annular groove also allows any liquid that seeps in to be quickly rectified in both directions. Furthermore, the outer peripheral groove wall 441 of the drain slot 44 is either in close contact with the inner wall of the inspection hatch 42 or is formed integrally with the inner wall of the inspection hatch 42, making the inner wall of the inspection hatch 42 the outer peripheral groove wall 441 of the recessed groove. This better receives liquid flowing down the inner wall of the inspection hatch 42 and prevents liquid from seeping into the explosion-proof electrical appliance case 4 through the gap between the inspection hatch 42 and the drain slot 44. Furthermore, the inner peripheral groove wall 442 of the drain slot 44 is flush with or slightly lower than the outer peripheral groove wall 441. That is, by being flush with or slightly lower than the inspection hatch 42, when the inspection cap 43 is closed, the upper end surface of the inner peripheral groove wall 442 abuts against the lower surface of the inspection cap 43 and is limited in position, which prevents liquid from splashing inside the drain slot 44 and promotes stable closure of the inspection cap 43 and the inspection hatch 42.

[0056] In particular, because inspection cap 43 rotates upward about the hinged side edge to open, when it is opened, water vapor, droplets, etc. adhering to inspection cap 43 slide down along the inner surface of inspection cap 43 toward the side where inspection cap 43 and inspection hatch 42 are hinged, and by locating spout 45 below the side where inspection cap 43 and inspection hatch 42 are hinged, it is possible to quickly drain any liquid that slides down when opening inspection cap 43. Preferably, the horizontal height of the bottom of drain slot 44 gradually decreases from the side away from spout 45 to spout 45, so that any liquid that enters drain slot 44 will naturally flow into spout 45 and be discharged under the guidance of the height difference, resulting in a simple structure and a stable flow straightening effect.

[0057] More preferably, as shown in Figure 2, a drain hole 17 is further opened on the rear surface of the cabinet body 1, and the drain hole 17 is provided at a position corresponding to the explosion-proof electrical appliance box 4, and is lower in horizontal height than the water outlet 45, and the water outlet 45 and the drain hole 17 are connected via a drain pipe. As a result, the liquid discharged from the water outlet of the drain slot 44 can be directly discharged outside the chemical vending machine through the drain hole 17 due to the difference in height without passing through the storage chamber 11, thereby protecting the chemicals in the storage chamber 11 from getting wet.

[0058] Those skilled in the art will understand that many technical details have been described in the above embodiments to facilitate a deeper understanding of the present application. However, even without these technical details and various changes and modifications based on the above embodiments, the technical solutions protected by the scope of protection of the present application can be essentially realized. Therefore, in actual applications, various changes in form and detail can be made to the above embodiments without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0059] 1 Cabinet body 11 Storage Chamber 12 Load plate 13 Ventilation holes 14 Guard Plate 15 Conductor hole 16 Explosion-proof proximity switch 17 Drain hole 18 Lock groove 2 cabinet doors 21 Door body 22 Explosion-proof panel 23 First door body 231 First Polymer Sheet 24 Second door body 241 Second Polymer Sheet 25 Closure slit 26 Sealing gasket 3 Load Sensor 4 Explosion-proof electrical appliance boxes 41 Position limiting groove 41a Closed end 41b open end 42 Inspection hatch 43 Inspection cap 44 Drain slot 441 Peripheral groove wall 442 Inner groove wall 45 Outlet 5 All partitions 6 Explosion-proof electromagnetic lock 61 cylinders 611 volts 612 Machine mechanism lock hole 7 Metal Handle 71 Grip 72 Fixed part 73 Fixing hole 74 Cabinet door mounting surface 8 hollow tube

Claims

1. A chemical vending machine, a cabinet body having a storage chamber partitioned by a built-in load plate to form multiple storage cells; a cabinet door provided corresponding to the opening of the storage chamber; a load sensor correspondingly provided in a load plate below each storage cell; an electrical appliance box located at an upper end of a cabinet body and containing electrical components including an electronic control device connected to at least the load sensor; a partition plate provided between the appliance box and the storage chamber; a metal handle, the surface of the cabinet door being covered with an insulating and anticorrosive layer, the metal handle and the surface of the cabinet door having corresponding through-holes, and metal screws passing through the insulating and anticorrosive layer and fastened into the through-holes; a grounding conductor having one end connected to the tip of the metal screw and the other end connected to the grounding end of the appliance box; a hollow tube, one end of which penetrates a surface of the cabinet door and is hingedly connected to the cabinet door, and the other end of which is movably provided in a position limiting groove that opens in a surface of the appliance box facing a user, the grounding conductor being connected to the ground end of the appliance box so as to penetrate the hollow tube; the position limiting groove has an open end and a closed end, the hollow tube is located at the closed end when the cabinet door is closed, the hollow tube moves to the open end within the position limiting groove when the cabinet door is opened, and when the hollow tube is located at the open end, the angle between the inner surface of the cabinet door and the surface on which the position limiting groove is located is 60° to 100°, the hollow tube is supported by the cabinet door and a side wall of the appliance box, and the cabinet door cannot be opened any further.

2. 2. The chemical vending machine according to claim 1, wherein the partition plate includes two layers of steel plates arranged in parallel, and fireproof cotton is filled between the steel plates.

3. 2. The chemical vending machine according to claim 1, wherein the load sensor is an intrinsically safe electrical appliance, and the load sensor and the electronic control device are communicatively connected via a cable.

4. 2. The chemical vending machine according to claim 1, further comprising an electromagnetic lock provided on an edge of the cabinet door, the electromagnetic lock further having a mechanical lock hole for manual unlocking.

5. The chemical vending machine according to claim 4, characterized in that the cabinet door includes a first door body and a second door body that swing open on both sides, and in a closed position, a closing slit is formed between two end faces of the first door body and the second door body that are remote from the cabinet main body, and a polymerized sheet that covers the closing slit is formed on an outer surface of the first door body and / or an inner surface of the second door body.

6. 6. The chemical vending machine according to claim 5, wherein the electromagnetic lock includes two cylinders respectively provided on the upper and lower edges of the first door.

7. the chemical vending machine further comprises a drain slot; The chemical vending machine according to claim 1, characterized in that an inspection hatch is opened above the electrical appliance box, an inspection cap is provided corresponding to the inspection hatch, there is a gap between the inspection cap and the inspection hatch, and the drain slot is provided below the gap.

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