A weighing device for materials inside a drug storage cabinet

Abstract

This utility model discloses a weighing device for materials inside a controlled substances cabinet, belonging to the field of pharmaceutical logistics. It includes an outer cabinet, an inner cabinet, and an infrared positioning substrate. A weighing component is installed between the outer and inner cabinets, and a hollow interlayer runs through the two side walls of the inner cabinet. The infrared positioning substrate passes through the hollow interlayer and is supported by the outer cabinet. The weighing component, as a weighing element, is used to sense changes in the overall or partial mass of the inner cabinet. The infrared positioning substrate senses the position of the medicines at the top of the inner cabinet within the hollow interlayer. The infrared positioning substrate is supported by the outer cabinet, achieving structural decoupling between the inner cabinet and the infrared positioning substrate. This avoids direct interference from the infrared positioning substrate hardware to the weighing component, reduces the weighing range of the weighing component, and improves weighing accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of pharmaceutical logistics, specifically a weighing device for materials inside a drug and psychotropic container. Background Technology

[0002] Drug storage cabinets, specifically designed for storing toxic drugs, narcotic drugs, and other controlled substances, are widely used in hospitals, pharmaceutical companies, and laboratories. With the continuous strengthening of drug management regulations, higher demands are being placed on the traceability and real-time monitoring of these cabinets.

[0003] To address the issue of drug positioning, some controlled substance cabinets have incorporated infrared sensor array systems. These systems automatically identify and determine the location of drug bottles by sensing their movement. While infrared arrays improve automation, their hardware components occupy a significant amount of space, requiring a large number of sensor units and control circuits to be installed within the cabinet, thus significantly increasing the structural weight of the weighing assembly. To meet the weighing requirements of additional mass, larger-range load cells must be selected. However, this increased range affects the sensor's sensitivity and resolution, leading to a decrease in overall weighing accuracy, particularly in its inability to detect minute changes in lightweight drugs.

[0004] Furthermore, the weighing components commonly used in controlled substance storage cabinets are mostly integrated weighing platforms, where an entire row of drugs or an entire compartment is set up as a single weighing area. While this structure simplifies construction and installation, it also has significant limitations: when users need to weigh individual rows or groups of drugs to accurately record the quantity used, the integrated weighing component cannot achieve regionally differentiated weighing, making it difficult to map the weighing data to specific drug categories or cell locations, thus affecting data traceability and regulatory compliance. Summary of the Invention

[0005] The purpose of this utility model is to provide a weighing device for materials inside a drug storage cabinet, so as to solve the problems mentioned in the prior art.

[0006] A weighing device for materials inside a drug storage cabinet is provided, comprising:

[0007] Outer cabinet;

[0008] The inner cabinet has a weighing component between it and the outer cabinet, and a hollow interlayer extends between the two side walls of the inner cabinet.

[0009] The infrared positioning substrate is carried by the outer cabinet after penetrating the cavity interlayer.

[0010] Furthermore, the inner cabinet includes several weighing units, and the cavity interlayers between the several weighing units are interconnected.

[0011] Multiple weighing units are independently weighed by corresponding elastomers, enabling area-based grouping and supporting drug weight monitoring by column and area. A hollow interlayer serves as a channel for the infrared positioning substrate, running through multiple weighing units to ensure integrated installation and continuous sensing capability of the infrared positioning substrate. This design gives the entire weighing system both high spatial positioning resolution and high-quality weighing resolution.

[0012] Furthermore, the weighing unit is provided with a medical clip, and the weighing unit has a through hole for sensing by an infrared positioning substrate.

[0013] The medicine clip, serving as a carrier for pharmaceutical materials, is placed along the sensing path of an infrared positioning substrate. The substrate determines the presence and location of the medicine by sensing whether it blocks infrared light, thus achieving precise sensing and recording of the medicine's location. Through-holes allow infrared light to penetrate and sense the medicine, enabling an array-based block positioning mode.

[0014] Furthermore, the medical clip and the weighing unit are detachably connected.

[0015] The medicine clips can be replaced according to the shape of the medicine bottle without changing the main structure of the weighing unit or infrared system, enabling modular installation and maintenance.

[0016] Furthermore, a spacer strip is provided between two adjacent weighing units.

[0017] The spacer bars provide lateral restraint to adjacent weighing units, enhancing the independence and identification accuracy of the weighing units and preventing weighing errors caused by weighing units crossing boundaries and coming into contact with each other.

[0018] Furthermore, the coefficient of friction of the spacer strip is less than 0.1.

[0019] To avoid the friction between the weighing unit and the spacer strip affecting the weighing accuracy when the unit is creeping.

[0020] Furthermore, the spacer extends along the entire length of the sidewall of the weighing unit.

[0021] This setup provides full-process physical limiting and guiding functions, and creates a complete seal to prevent external debris from entering the weighing assembly through the gaps between adjacent weighing units.

[0022] Furthermore, a support extending along the length of the weighing unit is provided between the weighing unit and the weighing assembly.

[0023] Because the weighing unit is long and slender, in order to avoid excessive cantilever length causing creep in the weighing unit, the support evenly distributes the load to the weighing component, preventing stress concentration and improving the stability and linear response of the weighing data.

[0024] Furthermore, the support is made of aluminum alloy.

[0025] Aluminum alloy is a lightweight and high-rigidity material. While improving structural strength, it can reduce the total weight of the support and reduce the risk of needing to upgrade the weighing range of the weighing components.

[0026] Furthermore, slide rails are provided on both sides of the outer cabinet.

[0027] The outer cabinet can be pulled out of the drug and psychotropic substance cabinet via a sliding rail, allowing the inner cabinet to be slid out for maintenance.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] The weighing assembly, as a weighing element, is used to sense changes in the overall or partial mass of the inner cabinet. The infrared positioning substrate, located within the cavity interlayer, senses the position of the medicines on the upper part of the inner cabinet. The infrared positioning substrate is supported by the outer cabinet, achieving structural decoupling between the inner cabinet and the infrared positioning substrate. This avoids direct interference from the infrared positioning substrate hardware to the weighing assembly, reduces the weighing range of the weighing assembly, and improves weighing accuracy. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is one of the schematic diagrams of the overall structure of a weighing device for materials inside a drug storage cabinet;

[0032] Figure 2 This is the second schematic diagram of the overall structure of a weighing device for materials inside a drug storage cabinet;

[0033] Figure 3 This is a partial structural diagram of a weighing device for materials inside a narcotic cabinet.

[0034] In the diagram: 1. Outer cabinet; 2. Inner cabinet; 21. Weighing unit; 22. Medical clip; 23. Through hole; 3. Infrared positioning substrate; 4. Weighing assembly; 5. Cavity interlayer; 6. Spacer; 7. Support; 8. Slide rail. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] Please see Figures 1-2 As shown in the embodiment of this utility model, a weighing device for materials inside a drug storage cabinet includes an outer cabinet 1, an inner cabinet 2, and an infrared positioning substrate 3. A weighing component 4 is disposed between the outer cabinet 1 and the inner cabinet 2, and a hollow interlayer 5 penetrates between the two side walls of the inner cabinet 2. The infrared positioning substrate 3 penetrates the hollow interlayer 5 and is supported by the outer cabinet 1.

[0038] The inner cabinet 2, the infrared positioning base plate 3, and the weighing component 4 are all installed inside the outer cabinet 1. The side wall of the outer cabinet 1 is provided with a mounting groove. The infrared positioning base plate 3 passes through the cavity interlayer 5 of the inner cabinet 2 and its two ends cooperate with the mounting groove. The infrared positioning base plate 3 is supported by the outer cabinet 1, forming a structural decoupling between it and the inner cabinet 2.

[0039] The infrared positioning substrate 3 consists of infrared emitting tubes and receiving tubes. The infrared emitting tubes are arranged in a matrix within the cavity interlayer 5 and can sense corresponding medicines through the inner cabinet 2. The receiving tubes are located inside the controlled substances cabinet to receive signals from the infrared emitting tubes. When medicine consumables, such as medicine bottles or reagent bottles, block the infrared beam, the signal from the receiving tube is blocked, indicating the presence of an item. If there is no blockage, it indicates the absence of an item. This allows for the location of items in specific compartments or areas of the shelf, achieving material positioning and traceability functions.

[0040] It should be noted that the infrared positioning substrate 3 is composed of a large number of tiny infrared detection units (pixels) arranged in rows and columns to form a two-dimensional grid. The sensing principle of the infrared detection unit mainly utilizes the thermoelectric effect. When infrared radiation irradiates the junction of a thermocouple composed of two different thermoelectric materials, the junction temperature rises, generating a voltage proportional to the temperature difference across the junction. Alternatively, it utilizes the pyroelectric effect, where the spontaneous polarization intensity of certain crystals changes with temperature, resulting in surface charges. Each pixel contains a small piece of pyroelectric material. Or, it utilizes the resistance effect, where infrared radiation heats the pixel, causing a change in pixel resistance, which is then converted into an electrical signal to sense the state of the material.

[0041] Specifically, the inner cabinet 2 includes several weighing units 21, each supported by an independent weighing component 4, forming a physically separated and functionally independent weighing area. The weighing component 4 acts as a weighing element, sensing the quality changes of the medicines within its supported area and providing an independent weighing signal output. The cavity interlayers 5 between the weighing units 21 are interconnected, forming a continuous distribution channel for the infrared positioning substrate 3, enabling continuous and seamless position sensing of multiple areas. Each weighing unit 21 weighs independently, allowing the system to accurately correspond to the column or compartment where the medicines are stored, achieving cumulative monitoring of the same medicine category or zone.

[0042] The weighing unit 21 is equipped with a medicine clip 22, which serves as a material-bearing structure for placing and fixing medicine bottles, ensuring the medicine is in a designated sensing position. A through-hole 23 passes through the weighing unit 21 for sensing by an infrared positioning substrate 3. The infrared positioning substrate 3 is located in the lower internal layer of the weighing unit 21 and emits an infrared beam upwards through the through-hole 23. After the medicine bottle is placed in the clip, its position is fixed on the infrared light path traversed by the through-hole 23. When the medicine bottle is placed, it blocks the infrared light; when not placed, the infrared light is received by the receiving tube. By detecting whether the infrared light is blocked, the presence and location of the medicine are determined. Each medicine clip 22, through-hole 23, and infrared positioning substrate 3 on the weighing unit 21 combine to form a positioning detection unit. Multiple such units form a two-dimensional array sensing layout, achieving grid-level sensing.

[0043] Furthermore, the medicine clamp 22 and the weighing unit 21 are connected in a detachable manner, such as by snap-fit, thread, or sliding groove, enabling quick replacement and independent maintenance of the clamp. The weighing unit 21 and the infrared positioning system remain structurally unchanged; only the surface clamping structure needs to be replaced to adapt to different specifications of medicines, and maintenance does not require interference with the infrared or weighing system.

[0044] A spacer strip 6 is provided between two adjacent weighing units 21 to form a physical separation boundary, preventing the weighing units 21 from crossing the boundary and contacting each other due to deformation, expansion, or assembly errors. The spacer strip 6 prevents physical contact and structural interference between the weighing units 21. More specifically, it avoids the internal stress generated between the two weighing units 21 and the adjacent weighing unit 21 when one of the weighing units 21 is compressed and displaced after contact, which would affect the weighing accuracy and eliminate the risk of force transmission and interference with the weighing signal caused by contact between adjacent weighing units 21.

[0045] Furthermore, the coefficient of friction of the spacer 6 is less than 0.1, and the material of the spacer 6 can be polytetrafluoroethylene, high molecular weight polyethylene, ceramic coating, etc. If there is a large friction between the spacer 6 and the weighing unit 21 or between the spacers 6 themselves, it will cause the weighing data to drift slowly or fluctuate, especially affecting the identification of trace amounts of medicine. By selecting the above materials, a low-friction sliding interface is formed at the structural contact point, reducing the frictional internal stress caused by the vertical relative sliding of the weighing unit 21, which would cause additional tensile force or eccentric force to the elastic body of the symmetrical weighing component 4, thus maintaining the real-time responsiveness and linear output characteristics of the high-sensitivity weighing structure.

[0046] In one specific embodiment, the spacer strip 6 is fixed to the side wall of the weighing unit 21 by adhesive or snap-fit, and two adjacent weighing units 21 are in contact with each other through the spacer strip 6.

[0047] Furthermore, the spacer strip 6 extends along the entire length of the sidewall of the weighing unit 21, forming a complete physical partition structure for the weighing unit 21 in the horizontal direction of movement. The continuous spacer strip 6 forms a full-length, close-fitting gap between the weighing units 21, effectively preventing fine impurities such as dust, powder, fibers, fragments, and liquid from falling into the cavity of the weighing component 4 through the gap, keeping the weighing area clean and the free movement space unobstructed.

[0048] Please see Figure 3 As shown, a support 7 extending along the length of the weighing unit 21 is provided between the weighing unit 21 and the weighing assembly 4. Because the weighing unit 21 is typically designed as a slender strip, if it is only supported at its ends or partially, structural cantilevering can easily occur. Under load, the slender structure may experience slight sagging, twisting, or creep, affecting the stability of the weighing data. The support 7 extending along the length direction can evenly distribute and transfer the drug load to the elastic body of the weighing assembly 4 below. The support 7 provides a continuous rigid support surface for the weighing unit 21, enhancing the overall structural rigidity of the system.

[0049] In one specific embodiment, the support 7 is made of aluminum alloy. Aluminum alloy has high specific stiffness, which can provide good structural support strength while controlling weight. The aluminum alloy support 7 can reduce additional load, avoid the need for system range upgrades, and maintain high sensitivity and measurement accuracy.

[0050] Please see Figure 1 As shown, slide rails 8 are provided on both sides of the outer cabinet 1. The slide rails 8 are provided on both sides of the outer cabinet 1 to install the outer cabinet 1 as a whole into the main cabinet of the drug and psychotropic drug cabinet. The outer cabinet 1 and the inner cabinet 2 are nested. By pulling out the outer cabinet 1 through the slide rails 8, the weighing component 4, infrared system and other internal components can be pulled out for maintenance.

[0051] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A device for weighing the contents of a poison cabinet, characterized in that include: Outer cabinet (1); The inner cabinet (2) is provided with a weighing component (4) between the outer cabinet (1) and the inner cabinet (2), and a hollow interlayer (5) is provided between the two side walls of the inner cabinet (2). The infrared positioning substrate (3) is carried by the outer cabinet (1) after penetrating the cavity interlayer (5).

2. A device for weighing the contents of a toxic chamber according to claim 1, characterized in that, The inner cabinet (2) includes several weighing units (21), and the cavity interlayer (5) between the several weighing units (21) is interconnected.

3. A device for weighing the contents of a toxic chamber according to claim 2, characterized in that, The weighing unit (21) is provided with a medical clip (22), and the weighing unit (21) has a through hole (23) for the infrared positioning substrate (3) to sense.

4. A device for weighing the contents of a toxic chamber according to claim 3, characterized in that, The medical clip (22) and the weighing unit (21) are detachably connected.

5. A weighing device for materials inside a drug storage cabinet according to claim 2, characterized in that, A spacer bar (6) is provided between two adjacent weighing units (21).

6. A device for weighing the contents of a toxic chamber according to claim 5, characterized in that, The coefficient of friction of the spacer (6) is less than 0.

1.

7. A device for weighing the contents of a toxic chamber according to claim 5, characterized in that, The spacer bar (6) extends over the entire length of the sidewall of the weighing unit (21).

8. A device for weighing the contents of a toxic chamber according to claim 2, characterized in that, A support (7) extending along the length of the weighing unit (21) is provided between the weighing unit (21) and the weighing component (4).

9. A device for weighing the contents of a narcotic safe according to claim 8, characterized in that The support (7) is made of aluminum alloy.

10. The apparatus according to claim 1, wherein, The outer cabinet (1) is provided with slide rails (8) on both sides.

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