High-precision dispensing device for chemical reference materials

Abstract

The utility model discloses a high accuracy partial shipment device of chemical reference substance relates to chemical reference substance partial shipment technical field, including the first L type spare of top mounted frame, the bottom of first L type spare is provided with mounting panel, the bottom of mounting panel is provided with two guide members to symmetrical inclination, a plurality of ball bearings are rotatably arranged in the guide member, part of ball bearings is located outside the guide member, the other side of guide member is provided with box, the box is stored with lubricating oil, both sides of guide member all are fixed and are inserted with two L type pipes. In the utility model, the friction between the capacity container and the guide member is reduced by the ball bearings, thereby reducing the probability of the capacity container pouring. When the surface of the ball bearings is short of oil, the user only needs to open the air valve and then close it, which can supplement the oil for the ball bearings. On the one hand, it can be operated manually without the aid of external tools, realizing convenient operation. On the other hand, the elastic force of the negative pressure balance spring can be used to avoid the leakage of lubricating oil.

Description

Technical Field

[0001] This utility model relates to the field of chemical reference standard dispensing technology, specifically a high-precision dispensing device for chemical reference standards. Background Technology

[0002] Chemical reference standards are a class of special chemical substances with specific characteristics, purity, or content, and whose quality has been strictly calibrated and verified; while dispensing machines are used to dispense centrally stored chemical reference standards (such as solid powders, liquids, and viscous substances) into volumetric containers.

[0003] In existing technologies, conveyor belts and guide structures are commonly used to transport the capacity container to the bottom of the dispensing machine. Driven by the conveyor belt, the capacity container can slide along the guide structure, thereby moving precisely to the bottom of the dispensing machine's discharge end (so that the top opening of the capacity container is aligned with the dispensing machine's discharge end; if it cannot be aligned, leakage will occur, which will lead to a reduction in the dispensing accuracy).

[0004] Friction is generated when the guide structure slides into contact with the container. On one hand, the guide structure exerts a frictional force on the top of the container, and on the other hand, the conveyor belt exerts a frictional force on the top of the container, but the two frictional forces are in opposite directions; therefore, the container is prone to tipping over. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision dispensing device for chemical reference standards to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-precision dispensing device for chemical reference standards, including a frame with a first L-shaped component mounted on the top, a mounting plate at the bottom of the first L-shaped component, two guides symmetrically and obliquely arranged at the bottom of the mounting plate, a plurality of balls rotatably disposed inside the guides, with parts of the balls located outside the guides, a housing disposed on the other side of the guides, the housing storing lubricating oil, and an L-shaped tube disposed on the side of the guides, one end of the L-shaped tube communicating with an oil cavity storing the lubricating oil, and the other end fixedly inserted into the guides and abutting against the balls.

[0007] Furthermore, the guide member has multiple mounting cavities and fixing ports on its interior and one side, respectively. The mounting cavities are connected to the fixing ports. The ball bearings are rotatably disposed in the mounting cavities and partially located outside the fixing ports. The end of the L-shaped tube away from the housing extends into the mounting cavity.

[0008] Furthermore, a partition plate is fixedly installed in the center of the box, and springs are provided on both sides of the partition plate. A piston is fixedly installed at the other end of the spring, and the piston is slidably connected to the box.

[0009] Furthermore, the number of springs on one side of the partition plate is 4; the springs on both sides of the partition plate are arranged symmetrically.

[0010] Furthermore, telescopic rods are provided on both sides of the partition plate, the number of which corresponds to the number of springs, and the springs are movably sleeved on the telescopic rods.

[0011] Furthermore, two one-way inlet valves communicating with the interior are symmetrically arranged on one side of the housing, and the two pistons are located between the two one-way inlet valves.

[0012] Furthermore, an electric push rod is fixedly installed on the top of the first L-shaped component in the vertical direction. The driving end of the electric push rod slides through the first L-shaped component and is fixedly connected to the top of the mounting plate.

[0013] Furthermore, it also includes a conveying assembly, which includes two rotating rollers. The top of the frame has a horizontally oriented mounting groove. The two rotating rollers are symmetrically rotated and mounted in the mounting groove. A belt is tensioned and sleeved on both rotating rollers. The belt is located directly below two guide members. A first motor is provided on the rear side of the frame. The drive shaft of the first motor extends rotatably into the mounting groove and is connected to one end of one of the rotating rollers.

[0014] Furthermore, it also includes a dispensing and filling assembly, which includes a second L-shaped component. The second L-shaped component is fixedly installed on the top of the frame. A storage box is provided on the top of the second L-shaped component, and a discharge valve is provided at the bottom of the storage box. The discharge valve passes through the second L-shaped component and is located directly above the belt.

[0015] Compared with the prior art, the beneficial effects of this utility model are: (1) By using ball bearings to reduce the friction between the capacity container and the guide, the probability of the capacity container tipping over is reduced.

[0016] (2) When the surface of the ball is lacking oil, the user only needs to open the air valve and then close it to replenish the oil to the ball. On the one hand, it can be operated manually without the need for external tools, which makes the operation convenient; on the other hand, the elasticity of the negative pressure balance spring can be used to avoid a large amount of lubricating oil leakage, thereby reducing waste.

[0017] (3) Turn on the electric push rod, which will cause the drive end of the electric push rod to extend and retract, thereby moving the mounting plate and guide components up and down. This will adjust the height of the guide components, thus enabling the guidance of containers of different heights. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the front exterior of this utility model; Figure 2 This is a three-dimensional structural diagram of the exterior of the back of this utility model; Figure 3 This is a top view and a semi-sectional view of the internal structure of the guide component of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a cross-sectional top view of the box structure in this utility model; Figure 6 This is a schematic diagram of the ball bearing arrangement of this utility model.

[0019] In the diagram: 1. Frame; 2. First L-shaped component; 3. Mounting plate; 4. Guide component; 5. Ball bearing; 6. Housing; 7. L-shaped tube; 8. Mounting cavity; 9. Fixing port; 10. Divider plate; 11. Spring; 12. Piston; 120. Rubber layer; 13. Telescopic rod; 14. One-way liquid inlet valve; 15. Electric push rod; 16. Mounting groove; 17. Rotating roller; 18. Belt; 19. First motor; 20. Second L-shaped component; 21. Storage box; 22. Discharge valve; 23. Air valve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4 This utility model provides a technical solution: a high-precision dispensing device for chemical reference standards, including a frame 1 with a first L-shaped component 2 mounted on the top, a mounting plate 3 at the bottom of the first L-shaped component 2, two guide components 4 symmetrically and obliquely arranged at the bottom of the mounting plate 3, a plurality of ball bearings 5 ​​rotatably disposed inside the guide components 4, with parts of the ball bearings 5 ​​located outside the guide components 4, a housing 6 disposed on the other side of the guide components 4, the housing 6 storing lubricating oil, and an L-shaped tube 7 disposed on the side of the guide components 4, one end of the L-shaped tube 7 communicating with the oil cavity storing the lubricating oil, and the other end fixedly inserted into the guide components 4 and abutting against the ball bearings 5.

[0022] Please see Figures 1-2It also includes a conveying assembly, which includes two rotating rollers 17. The top of the frame 1 has a horizontally oriented mounting groove 16. The two rotating rollers 17 are symmetrically rotated and installed in the mounting groove 16. The two rotating rollers 17 are respectively inserted into the two ends of the inner cavity of the belt 18. The two rotating rollers 17 together tension the belt 18. The belt 18 is located directly below the two guide members 4. A first motor 19 is provided on the rear side of the frame 1. The drive shaft of the first motor 19 extends rotatably into the mounting groove 16 and is connected to one end of one of the rotating rollers 17.

[0023] Please see Figures 1-2 The housing of the first motor 19 is fixedly connected to the outer wall of the frame 1 by bolts, and the drive shaft of the first motor 19 is coaxially arranged with one of the rotating rollers 17 and fixedly connected by bolts.

[0024] Several rotatable auxiliary support rollers are provided between the two rotating rollers 17, and the auxiliary support rollers are arranged parallel to the rotating rollers 17. The two ends of the auxiliary support rollers are rotatably connected to the side walls of the mounting groove 16 (a central shaft is inserted and fixed at the center of the auxiliary support roller, and the end of the central shaft is connected to the side wall of the mounting groove 16 through a bearing and bearing seat). The spacing between adjacent auxiliary support rollers is 20 cm to 50 cm, used to support the weight of the capacity container and prevent the belt 18 from sinking due to pressure from the capacity container. The belt 18 is sleeved on the outer circumference of the auxiliary support rollers; the top surface of the auxiliary support rollers is pressed against the top surface of the inner cavity of the belt 18; the top surface of the auxiliary support rollers is at the same height as the top surface of the rotating rollers 17. The diameter of the auxiliary support rollers is smaller than the diameter of the rotating rollers 17.

[0025] Please see Figures 1-2 The system also includes a dispensing and filling assembly, which includes a second L-shaped component 20. The second L-shaped component 20 is bolted to the top of the frame 1. A storage tank 21 is located on the top of the second L-shaped component 20, and a discharge valve 22 is located at the bottom of the storage tank 21. The discharge valve 22 passes through the second L-shaped component 20 and is located directly above the belt 18. The discharge valve 22 is a solenoid valve, and the opening time of the solenoid valve is controlled by an external controller (such as a computer or a PLC programmable logic controller), which can control the amount of chemical reference material discharged in a single operation, i.e., the amount of chemical reference material falling into a single volumetric container.

[0026] In practice, the volumetric container is placed on top of the belt 18, and then the first motor 19 is turned on. The drive shaft of the first motor 19 drives one of the rotating rollers 17 to rotate, so that the belt 18 moves on the two rotating rollers 17 and transports the volumetric container (the volumetric container is pressed against the top surface of the belt 18 at this time). During this process, when the volumetric container comes into contact with the ball 5 on one of the guide members 4, it can drive the ball 5 to rotate, so that the volumetric container slides along the guide member 4 to the position of the top center line of the belt 18, so that the volumetric container is finally transported to the bottom of the discharge valve 22, achieving the effect of dispensing and canning chemical reference standards.

[0027] The first motor 19 is a controllable motor (such as a servo motor or a stepper motor). By inputting electrical signals to the controllable motor through an external controller (such as a computer or a PLC programmable logic controller), the speed, number of rotations, and start / stop timing of the controllable motor can be controlled.

[0028] Please see Figures 1-4 In addition, since the lubricating oil inside the housing 6 is applied to the ball bearings 5 ​​through the L-shaped tube 7, the friction between the capacity container and the ball bearings 5, as well as the friction of the ball bearings 5 ​​in the mounting cavity 8, is reduced. This allows the capacity container to slide more smoothly along the guide 4 to the center of the conveyor belt, thus improving the problem of frequent tipping of the capacity container.

[0029] Please see Figures 1-4 Finally, when the volumetric container is transported directly below the discharge valve 22, the discharge valve 22 is opened, allowing the discharge valve 22 to pour the chemical reference material stored in the storage tank 21 into the volumetric container. Based on the above principle, multiple volumetric containers can be dispensed with high precision in sequence.

[0030] It should be noted that, in order to pause the movement of the volumetric container when it reaches the discharge valve 22, an infrared detector can be installed on the front side of the second L-shaped component 20. The infrared detector is equipped with a switch and is located diagonally below the discharge valve 22. The infrared detector can be used to detect the transport position of the volumetric container. Both the infrared detector and the switch are electrically connected to the first motor 19. When the volumetric container reaches directly below the discharge valve 22, the infrared detector and the volumetric container are at the same horizontal level, so that the switch on the infrared detector controls the first motor 19 to close. At this time, the discharge valve 22 is convenient for filling the container with chemical reference materials. It should also be noted that we need to control the conveying speed of the belt 18 to avoid the problem of inertial movement of the volumetric container when the belt 18 stops suddenly. Since the infrared detector and the switch are existing technologies, they will not be elaborated on further.

[0031] Please see Figures 3-4The guide member 4 has multiple mounting cavities 8 and fixing ports 9 on its interior and one side, respectively. The mounting cavities 8 and fixing ports 9 correspond one-to-one and are connected to each other. The ball bearings 5 ​​are rolled in the mounting cavities 8 and part of them are located outside the fixing ports 9. The end of the L-shaped tube 7 away from the housing 6 extends into the mounting cavity 8; that is, the end of the L-shaped tube 7 away from the oil cavity is connected to the mounting cavity 8.

[0032] Please see Figures 3-4 To facilitate the installation of the ball bearing 5 inside the guide member 4, the guide member 4 can be divided into two halves. This allows for the creation (e.g., machined) of an installation cavity 8 and a fixing port 9 within the guide member 4, enabling the ball bearing 5 to be easily rotated and installed inside the guide member 4. Finally, the two halves of the guide member 4 can be closed and fixed (e.g., using bolts and sealing rings to achieve a sealed and fixed connection).

[0033] Please see Figures 3-4 A partition plate 10 is fixedly installed at the center of the inner cavity of the housing 6. Springs 11 are installed on both sides of the partition plate 10, and pistons 12 are fixedly installed at the other end of each spring 11. The pistons 12 are slidably connected inside the housing 6. (Please refer to...) Figures 3-4 Telescopic rods 13 are also provided on both sides of the partition plate 10. The number of telescopic rods 13 corresponds to the number of springs 11, and the springs 11 are movably sleeved on the telescopic rods 13.

[0034] In practical implementation, based on the above, the cooperation between spring 11 and telescopic rod 13 allows spring 11 to push piston 12 away from partition plate 10 due to its own elasticity, actively pushing lubricating oil into L-shaped tube 7, thereby improving the effect of applying lubricating oil to ball bearing 5. Telescopic rod 13 is a multi-section sleeve; both ends of telescopic rod 13 are vertically fixedly connected to piston 12 and partition plate 10 respectively (e.g., by bolts); spring 11 is sleeved on the outer circumference of telescopic rod 13, and telescopic rod 13 guides spring 11, ensuring that spring remains perpendicular to piston 12. When spring 11 extends or retracts, telescopic rod 13 extends or retracts synchronously. Spring 11 is a compression spring.

[0035] Please see Figures 3-5 The partition plate 10 is a rectangular plate structure; there are 4 springs 11 on one side of the partition plate 10 (these 4 springs 11 are respectively set at the four right angle positions of the partition plate 10 to apply thrust to the piston 12 evenly and avoid uneven load on the piston 12); the springs (11) on both sides of the partition plate 10 are arranged symmetrically. A total of 8 springs 11 are provided on the side of the partition plate 10.

[0036] Please see Figures 3-5Two one-way inlet valves 14, connected to the interior, are symmetrically arranged on one side of the housing 6. The one-way inlet valves 14 are sealed and fixedly connected to the side wall of the housing 6 (e.g., via bolts and sealing rings). The one-way inlet valves 14 are located on the outer side wall of the housing 6, and two pistons 12 are located between the two one-way inlet valves 14. Two oil chambers are located at opposite ends of the inner cavity of the housing 6, i.e., on the side of the pistons 12 furthest from the partition plate 10. The two one-way inlet valves 14 are connected to the two oil chambers respectively, and the two oil chambers are isolated from each other. The user can connect the external oil supply pipe of the external oil gun to the one-way inlet valves 14 to replenish lubricating oil into the oil chambers. When the user needs to replenish lubricating oil, the one-way inlet valves 14 need to be opened; after replenishing the lubricating oil, the one-way inlet valves 14 are closed.

[0037] Please see Figures 4-5 An air chamber is provided between the piston 12 and the partition plate 10. The inner cavity of the housing 6 has two air chambers, located on either side of the partition plate 10 and corresponding to two oil chambers. The two air chambers are not interconnected. Two air valves 23 are installed on the outer wall of the housing 6, each communicating with one of the two air chambers. The air valves 23 are installed on the side wall of the housing 6 near the partition plate 10, thus communicating with the ends of the air chambers near the partition plate 10.

[0038] An oil valve is installed in the middle of the L-shaped pipe.

[0039] During the oil replenishment operation: ① The user first closes the oil valve, opens the one-way liquid inlet valve 14, and opens the air valve 23; ② Then, the lubricating oil is pressed into the oil chamber, which can push the piston 12 (overcoming the elastic force of the spring 11) to move closer to the partition plate 10 (during the process, the air in the air chamber is discharged to the outside through the air valve 23); ③ After the oil chamber is filled with a sufficient amount of lubricating oil, the user needs to first close the air valve 23, then close the one-way liquid inlet valve 14, and then remove the oil gun and open the oil valve.

[0040] Balance principle: When the air valve 23 is closed, the air chamber is in a sealed state; the spring 11 can slightly push the piston 12 away from the partition plate 10, so the volume of the air chamber increases slightly and a negative pressure is formed in the air chamber; the negative pressure will balance the elastic force of the spring 11, so the spring 11 cannot move and cannot push the lubricating oil to flow out of the L-shaped pipe 7 in large quantities (to avoid a large amount of lubricating oil leakage).

[0041] Oiling principle: When the user (with the naked eye) observes that the surface of the ball bearing 5 is lacking oil, the air valve 23 can be slightly opened and then quickly closed; during the opening of the air valve 23, outside air enters the air chamber through the air valve 23, and the negative pressure disappears. The spring 11 can push the piston 12 to move to discharge the lubricating oil, thereby replenishing the oil to the ball bearing 5; after the air valve 23 is closed, the spring 11 pushes the piston 12 slightly outward again to form a negative pressure, until the negative pressure and the spring force are balanced, and the piston 12 is brought to a standstill again.

[0042] This utility model has a simple structure and reliable function. When the surface of the ball bearing 5 is lacking oil, the user only needs to open the air valve 23 and then close it to replenish the oil to the ball bearing 5. On the one hand, it can be operated manually without the need for external tools, which makes the operation convenient; on the other hand, it can avoid a large amount of lubricating oil leakage.

[0043] Please see Figure 5 The piston 12 is covered with a rubber layer 120. The piston 12 and the housing 6 are squeezed together from the inside and outside to increase the sealing between the piston 12 and the inner wall of the housing 6, so as to prevent oil leakage and air leakage.

[0044] Please see Figures 4-5 An electric push rod 15 is fixedly mounted vertically on the top of the first L-shaped component 2. The drive end of the electric push rod 15 slides through the first L-shaped component 2 and is fixedly connected to the top of the mounting plate 3. The housing of the electric push rod 15 is fixedly connected to the top of the first L-shaped component 2 by bolts.

[0045] In specific implementation, based on the above implementation, the electric push rod 15 is activated, which allows the drive end of the electric push rod 15 to extend and retract, driving the mounting plate 3 and the guide member 4 to move up and down, thereby adjusting the height of the guide member 4, and thus guiding containers of different heights.

[0046] Before use, all electrical appliances involved in the dispensing device need to be connected to an external power source, or a battery pack needs to be installed in an area outside the frame 1 that does not obstruct other components. Then, the battery pack and electrical appliances are connected by wiring. It is also necessary to avoid the wiring from getting tangled due to the movement of the components. Wiring needs to be buried and planned and organized to provide power to the electrical appliances, thereby ensuring their normal operation and switching. Since connecting the electrical appliances to an external power source or setting up a battery pack for power supply are existing technologies and are not problems that need to be solved in the background technology of this manual, they will not be explained in detail.

[0047] Working principle: In use, the capacity container is first placed on top of the belt 18, and then the first motor 19 is turned on. The drive shaft of the first motor 19 drives one of the rotating rollers 17 to rotate, so that the belt 18 moves on the two rotating rollers 17 to transport the capacity container. During this process, when the capacity container comes into contact with the ball 5 on one of the guide members 4, the ball 5 can rotate, so that the capacity container slides along the guide member 4 to the position of the top center line of the belt 18. This allows the capacity container to be transported to the position directly below the discharge valve 22, achieving the effect of high-precision dispensing and filling of chemical reference materials into the capacity container. In addition, since the lubricating oil in the housing 6 is applied to the ball 5 through the L-shaped tube 7, the friction between the capacity container and the ball 5 and the friction of the ball 5 in the mounting cavity 8 are reduced. This allows the capacity container to slide more smoothly along the guide member 4 to the center position of the conveyor belt, avoiding the problem of the capacity container easily tipping over.

[0048] In addition, the cooperation between the spring 11 and the telescopic rod 13 allows the spring 11 to push the piston 12 away from the partition plate 10 along the telescopic end of the telescopic rod 13 due to its own elastic force, which can actively push the lubricating oil into the L-shaped tube 7, thereby improving the effect of applying lubricating oil to the ball bearing 5.

[0049] When the electric push rod 15 is activated, the drive end of the electric push rod 15 can extend and retract, causing the mounting plate 3 and the guide member 4 to move up and down. This allows the height of the guide member 4 to be adjusted, thereby providing a guiding function for containers of different heights.

[0050] Finally, when the volumetric container is transported to the bottom of the discharge valve 22, the discharge valve 22 is opened, allowing the discharge valve 22 to pour the chemical reference material stored in the storage tank 21 into the volumetric container. Based on the above principle, multiple volumetric containers can be dispensed with high precision.

[0051] Reference Figure 6 The guide member 4 has several ball bearings 5 ​​arranged in a matrix on its side wall to evenly support the capacity container laterally. Each ball bearing 5 corresponds to a mounting cavity 8, and each mounting cavity 8 is connected to the oil cavity through an L-shaped pipe 7. When the user opens the air valve 23 corresponding to a certain air cavity, oil can be supplied to the oil cavity, L-shaped pipe 7, and mounting cavity 8 corresponding to that air cavity.

Claims

1. A high-precision dispensing device for chemical reference standards, comprising a frame (1) with a first L-shaped component (2) mounted on top, characterized in that, The first L-shaped part (2) has a mounting plate (3) at its bottom. The mounting plate (3) has two guides (4) symmetrically inclined at its bottom. Multiple balls (5) are rotatably arranged inside the guides (4). Part of the balls (5) are located outside the guides (4). A box (6) is provided on the other side of the guides (4). Lubricating oil is stored in the box (6). An L-shaped tube (7) is provided on the side of the guides (4). One end of the L-shaped tube (7) is connected to the oil cavity storing the lubricating oil, and the other end is fixedly inserted into the guides (4) and abuts against the balls (5).

2. The high-precision dispensing device for chemical reference standards as described in claim 1, characterized in that: The guide (4) has multiple mounting cavities (8) and fixing ports (9) on its interior and one side, respectively. The mounting cavities (8) are connected to the fixing ports (9). The ball bearing (5) is rotatably disposed in the mounting cavity (8) and part of it is located outside the fixing port (9). The end of the L-shaped tube (7) away from the box body (6) extends into the mounting cavity (8).

3. The high-precision dispensing device for chemical reference standards as described in claim 1, characterized in that: A partition plate (10) is fixedly installed in the center of the box (6). Springs (11) are provided on both sides of the partition plate (10). A piston (12) is fixedly installed at the other end of the spring (11). The piston (12) is slidably connected inside the box (6).

4. The high-precision dispensing device for chemical reference standards as described in claim 3, characterized in that: The number of springs (11) on one side of the partition plate (10) is 4; the springs (11) on both sides of the partition plate (10) are arranged symmetrically.

5. The high-precision dispensing device for chemical reference standards as described in claim 4, characterized in that: Telescopic rods (13) are also provided on both sides of the partition plate (10). The number of telescopic rods (13) corresponds to the number of springs (11). The springs (11) are movably sleeved on the telescopic rods (13).

6. The high-precision dispensing device for chemical reference standards as described in claim 3, characterized in that: Two one-way inlet valves (14) that communicate with the interior are symmetrically arranged on one side of the housing (6), and the two pistons (12) are located between the two one-way inlet valves (14).

7. The high-precision dispensing device for chemical reference standards as described in claim 1, characterized in that: An electric push rod (15) is fixedly installed on the top of the first L-shaped part (2) in the vertical direction. The driving end of the electric push rod (15) slides through the first L-shaped part (2) and is fixedly connected to the top of the mounting plate (3).

8. The high-precision dispensing device for chemical reference standards as described in claim 1, characterized in that: It also includes a conveying assembly, which includes two rotating rollers (17). The top of the frame (1) is provided with a horizontal mounting groove (16). The two rotating rollers (17) are symmetrically rotated and installed in the mounting groove (16). A belt (18) is tensioned and sleeved on both rotating rollers (17). The belt (18) is located directly below the two guide members (4). A first motor (19) is provided on the rear side of the frame (1). The drive shaft of the first motor (19) extends rotatably into the mounting groove (16) and is connected to one end of one of the rotating rollers (17) for transmission.

9. The high-precision dispensing device for chemical reference standards as described in claim 1, characterized in that: It also includes a dispensing and filling assembly, which includes a second L-shaped component (20), which is fixedly installed on the top of the frame (1). A storage box (21) is provided on the top of the second L-shaped component (20), and a discharge valve (22) is provided at the bottom of the storage box (21). The discharge valve (22) passes through the second L-shaped component (20) and is located directly above the belt (18).

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