Weighing and stirring system
By designing a weighing and stirring system that can lift and lower weighing seats, temperature regulation and magnetic stirring in the laboratory, the denaturation and volatility of drugs when configuring the solution is solved, precise weighing and efficient stirring are achieved, and the solution quality is improved and Experimental efficiency.
Patent Information
- Application Number
- CN202420865434.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-24
AI Technical Summary
When labs configure solutions, volatile drugs and temperature-sensitive drugs are prone to denaturation or volatility when added to the volumetric flask after weighing, affecting the quality of the solution.
A weighing and agitation system is designed, including a liftable weighing seat, a temperature adjustment device, a magnetic stirrer and a flexible neck hole to ensure that the drug is not exposed to air during weighing and stirring, and achieves accurate weighing and Stir evenly.
It effectively avoids the volatility and degeneration of the drug, ensures the accuracy of solution ratio and mixing quality, and improves the efficiency and accuracy of laboratory work.
Smart Images
Figure CN222196723U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mixing devices, in particular to a weighing and stirring system. Background Art
[0002] When preparing solutions in laboratories, some solutions need to be prepared by weight, that is, after sampling, the volume is fixed. If the samples are weighed on a scale and then placed in a volumetric flask, the weight of some volatile drugs will change very quickly. There are also some drugs that are greatly affected by temperature, such as ethane, which may decompose at room temperature, while the normal storage environment should be at four degrees Celsius. Therefore, the denaturation or volatilization of drugs during solution preparation has a great impact on the quality of the solution. Utility Model Content
[0003] The utility model provides a weighing and stirring system, which solves the problem in the related art that when a solution is prepared in a laboratory and then the medicine is put into a volumetric flask after weighing, the medicine volatilizes or denatures and affects the quality of the solution.
[0004] The technical solution of the utility model is as follows:
[0005] Weighing and mixing system, including
[0006] Base,
[0007] A bottom fixing seat, the bottom fixing seat is arranged on the base, and the bottom fixing seat has a first fixing cavity,
[0008] A weighing seat, the weighing seat is lifted and arranged in the first fixed cavity, and has a weighing platform, and a temperature regulating device is arranged on the weighing platform.
[0009] A magnetic stirrer, wherein the magnetic stirrer is arranged on the weighing seat, and the weighing platform and the magnetic stirrer are respectively located on the upper and lower sides of the weighing seat.
[0010] A neck fixing piece is arranged above the bottom fixing seat and has a neck fixing hole.
[0011] As a further technical solution, the inner wall of the neck fixing hole is a flexible part.
[0012] As a further technical solution, the neck fixing member has a clamping cavity and further includes
[0013] A clamping device is arranged in the clamping cavity, and the neck hole and the clamping device are respectively located on two sides of the flexible member.
[0014] As a further technical solution, the clamping device includes
[0015] An arc-shaped clamping piece is swingably arranged in the clamping cavity, and after swinging, it approaches or moves away from the flexible member, and is arranged in a plurality of circles.
[0016] As a further technical solution, it also includes
[0017] A push ring is slidably arranged in the clamping cavity and has a through channel. The arc-shaped clamping piece passes through the through channel. An inner wall on one side of the through channel abuts against the arc-shaped clamping piece. After the push ring moves, it pushes the arc-shaped clamping piece to swing.
[0018] As a further technical solution, the solid neck hole has a smooth transition portion, a cylindrical portion and a tapered portion from top to bottom, and the cross-section of the tapered portion gradually increases from top to bottom.
[0019] As a further technical solution, it also includes
[0020] A screw rod, the screw rod is arranged in the clamping cavity, the screw rod is threadedly connected with the pushing ring,
[0021] A guide rod is arranged in the clamping cavity, and the push ring has a guide hole, and the guide rod is arranged in the guide hole.
[0022] As a further technical solution, the inner wall of the clamping cavity has a mounting portion, and further includes
[0023] The elastic member includes a plurality of elastic members, one end of which acts on the mounting portion and the other end of which acts on the outer wall of the arc-shaped clamping piece to provide a force for the arc-shaped clamping piece to approach the flexible member.
[0024] As a further technical solution, the arc-shaped clamping piece, the neck fixing piece, and the flexible piece are all transparent pieces.
[0025] As a further technical solution, the bottom fixing seat, the weighing seat and the neck fixing piece are all in plurality and are arranged in an array on the base.
[0026] The working principle and beneficial effects of the utility model are:
[0027] The utility model designs a base, which is used as the supporting foundation of the whole system, for carrying all other components and ensuring the stability of the system. The bottom fixing seat is fixedly mounted on the base, and a first fixing cavity is arranged inside the bottom fixing seat, which is used to carry and adjust the height of the weighing seat, and the first fixing cavity is also used to accommodate the volumetric flask. The weighing seat is designed as a liftable structure, which is arranged in the first fixing cavity of the bottom fixing seat. The weighing seat is equipped with a weighing platform, which is used to accurately measure the weight of the volumetric flask, solution and solute placed thereon. A temperature regulating device can also be arranged on the weighing platform, and the temperature in the volumetric flask can be controlled by the temperature regulating device to avoid the denaturation of the substance due to temperature. The magnetic stirrer is installed on the weighing seat, and is located on the upper and lower sides of the weighing seat with the weighing platform. The magnetic stirrer can drive the liquid in the volumetric flask to rotate through the magnetic field without directly contacting the solution, so as to achieve uniform stirring of the solution. The neck fixing part is arranged above the bottom fixing seat, and has a fixed neck hole, which is used to fix the bottleneck of the volumetric flask, so as to ensure that the volumetric flask remains stable during the stirring process, prevent tipping or shaking, and also ensure the accuracy of weighing. Through such a design, the weighing and stirring system can achieve accurate weighing and efficient stirring in the process of preparing the volumetric flask, greatly improving the quality and efficiency of laboratory work. Compared with the weighing and stirring system of the prior art, the temperature regulating device can pre-adjust the temperature of the volumetric flask to the mixing temperature, and then inject the solvent and solute into the volumetric flask respectively. The weighing table weighs when the medicine is added, which can effectively ensure the accuracy of the solution ratio, avoid the volatilization of the medicine in the process of adding the medicine to the volumetric flask after weighing, and avoid the medicine being exposed to the air during weighing, and the failure of the medicine caused by the ambient temperature, thereby improving the mixing quality of the solution. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.
[0029] Figure 1 It is a schematic diagram of the structure of the utility model;
[0030] Figure 2 It is a structural schematic diagram of the solid neck hole in the utility model.
[0031] In the figure: base 1, bottom fixing seat 2, first fixing cavity 201, weighing seat 3, weighing platform 301, temperature regulating device 302, magnetic stirrer 4, neck fixing part 5, neck hole 501, flexible part 502, clamping cavity 503, clamping device 6, arc clamping piece 601, pushing ring 7, through channel 701, smooth transition part 504, columnar part 505, conical part 506, screw 8, guide rod 9, guide hole 702, elastic part 10, mounting part 507. DETAILED DESCRIPTION
[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0033] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".
[0034] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0035] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0036] Reference Figure 1~Figure 2 , is an embodiment of the utility model, and proposes a weighing and stirring system, including a base 1, a bottom fixing base 2 is arranged on the base 1, the bottom fixing base 2 has a first fixing cavity 201, a weighing base 3 is raised and lowered in the first fixing cavity 201, and has a weighing platform 301, a temperature regulating device 302 is arranged on the weighing platform 301, a magnetic stirrer 4 is arranged on the weighing base 3, the weighing platform 301 and the magnetic stirrer 4 are respectively located on the upper and lower sides of the weighing base 3, and a neck fixing member 5 is arranged above the bottom fixing base 2 and has a neck fixing hole 501.
[0037] The present embodiment designs a base 1, which is used as the supporting foundation of the entire system, for carrying all other components and ensuring the stability of the system. The bottom fixing seat 2 is fixedly mounted on the base 1, and a first fixed cavity 201 is provided inside the bottom fixing seat 2, which is used to carry and adjust the height of the weighing seat 3, and the first fixed cavity 201 is also used to accommodate a volumetric flask. The weighing seat 3 is designed as a liftable structure, which is arranged in the first fixed cavity 201 of the bottom fixing seat 2. The weighing seat 3 is equipped with a weighing platform 301, which is used to accurately measure the weight of the volumetric flask, solution and solute placed thereon. A temperature regulating device 302 can also be arranged on the weighing platform 301, and the temperature in the volumetric flask is controlled by the temperature regulating device 302 to avoid the denaturation of the substance due to temperature. The magnetic stirrer 4 is installed on the weighing seat 3, and is located on the upper and lower sides of the weighing seat 3 with the weighing platform 301. The magnetic stirrer 4 can drive the liquid in the volumetric flask to rotate through the magnetic field without directly contacting the solution, so as to achieve uniform stirring of the solution. Neck fixing part 5: arranged above the bottom fixing seat 2, with a fixed neck hole 501, used to fix the bottleneck of the volumetric flask, ensure that the volumetric flask remains stable during the stirring process, prevent tipping or shaking, and also ensure the accuracy of weighing. Through such a design, the weighing and stirring system can achieve accurate weighing and efficient stirring in the process of preparing the volumetric flask, greatly improving the quality and efficiency of laboratory work. Compared with the weighing and stirring system of the prior art, the temperature regulating device 302 can pre-adjust the temperature of the volumetric flask to the mixing temperature, and then inject the solvent and the solute into the volumetric flask respectively, and the weighing platform 301 weighs when adding the medicine, which can effectively ensure the accuracy of the solution ratio, avoid the volatilization of the medicine in the process of adding the medicine to the volumetric flask after weighing, and also avoid the medicine being exposed to the air when weighing, and the failure of the medicine caused by the ambient temperature, thereby improving the mixing quality of the solution.
[0038] Furthermore, the inner wall of the neck hole 501 is a flexible member 502 .
[0039] In this embodiment, the inner wall of the neck fixing hole 501 of the neck fixing member 5 is made of a flexible material. This means that the neck fixing hole 501 can not only adapt to the shape and size of the bottleneck of different specifications of the volumetric flask to ensure a secure fixation, but also avoid damage to the bottleneck during the fixation process, especially for fragile or sensitive glass containers. The flexible inner wall can also absorb slight vibrations during the stirring process to a certain extent, further ensuring the safety and stability of the experimental operation, so that the entire weighing and stirring system can meet the requirements of accurate weighing and efficient stirring while taking into account the good protection of the experimental container.
[0040] Furthermore, the neck fixing member 5 has a clamping cavity 503 and also includes a clamping device 6 . The clamping device 6 is arranged in the clamping cavity 503 . The neck fixing hole 501 and the clamping device 6 are respectively located on both sides of the flexible member 502 .
[0041] In this embodiment, a clamping cavity 503 is designed inside the neck fixing member 5, and a clamping device 6 is also provided, and the clamping device 6 is installed inside the clamping cavity 503. The fixed neck hole 501 and the clamping device 6 are respectively located on both sides of the flexible member 502. During specific operation, the bottleneck of the volumetric flask first passes through the fixed neck hole 501, and the flexible inner wall can gently cover and adapt to the shape of the bottleneck, and then it is fixed and adjusted by the clamping device 6, so that the volumetric flask remains stable during the stirring process, and will not be displaced or loosened due to factors such as vibration during the stirring process. This design can not only better protect the volumetric flask from damage, but also ensure the precise control of the container position during the entire liquid preparation, weighing and stirring process, thereby improving the accuracy and reliability of the experimental data.
[0042] Furthermore, the clamping device 6 includes an arc-shaped clamping piece 601, which is swingably disposed in the clamping cavity 503, and moves closer to or away from the flexible member 502 after swinging, and is arranged in a plurality of circles.
[0043] In this embodiment, a clamping cavity 503 is designed inside the neck fixing member 5, and a clamping device 6 is also provided, and the clamping device 6 is installed inside the clamping cavity 503. The fixed neck hole 501 and the clamping device 6 are respectively located on both sides of the flexible member 502. During specific operation, the bottleneck of the volumetric flask first passes through the fixed neck hole 501, and the flexible inner wall can gently cover and adapt to the shape of the bottleneck, and then it is fixed and adjusted by the clamping device 6, so that the volumetric flask remains stable during the stirring process, and will not be displaced or loosened due to factors such as vibration during the stirring process. This design can not only better protect the volumetric flask from damage, but also ensure the precise control of the container position during the entire liquid preparation, weighing and stirring process, thereby improving the accuracy and reliability of the experimental data.
[0044] Furthermore, it also includes a pushing ring 7, which is slidably set in the clamping cavity 503 and has a through channel 701. The arc-shaped clamping piece 601 passes through the through channel 701. The inner wall of one side of the through channel 701 abuts against the arc-shaped clamping piece 601. After the pushing ring 7 moves, it pushes the arc-shaped clamping piece 601 to swing.
[0045] In this embodiment, a push ring 7 is designed, and the push ring 7 is slidably arranged inside the clamping cavity 503. A through channel 701 is provided on the push ring 7, so that the arc-shaped clamping piece 601 can pass through and move inside the push ring 7. When the push ring 7 moves, the inner wall of one side of the through channel 701 thereon will contact the arc-shaped clamping piece 601 and exert a force, so that the arc-shaped clamping piece 601 can swing along a predetermined trajectory. During specific operation, by adjusting the position of the push ring 7, the arc-shaped clamping piece 601 can be controlled to approach or move away from the flexible member 502, thereby achieving the clamping and release of the bottlenecks of different-sized capacity bottles. This design allows the operator to conveniently and quickly adjust the clamping device 6 flexibly according to the required fixed container size to ensure the stability of the container during the mixing process, while also avoiding the damage to the container that may be caused by excessive clamping, thereby improving the applicability and stability of the weighing and mixing system.
[0046] Furthermore, the solid neck hole 501 has a smooth transition portion 504, a cylindrical portion 505 and a tapered portion 506 from top to bottom, and the cross-section of the tapered portion 506 gradually increases from top to bottom.
[0047] In this embodiment, the solid neck hole 501 is designed as a three-layer structure from top to bottom, which is a smooth transition portion 504, a cylindrical portion 505 and a tapered portion 506. Among them, the smooth transition portion 504 is located at the uppermost end, which is used to guide the volumetric bottle cap to smoothly enter the solid neck hole 501, reducing the possibility of scratches or jams; the cylindrical portion 505 is the middle area, which has a certain diameter retention and can firmly fix the main part of the bottleneck; the tapered portion 506 is located at the lowermost end, and its characteristic is that the cross-section gradually increases from top to bottom. Such a design can adapt to the bottlenecks of volumetric bottles with slightly smaller calibers of different diameters, and provide a gradually expanding guide space when the volumetric bottle is placed, ensuring that the volumetric bottle can be more easily placed and fixed on the weighing and stirring system, while reducing the possibility of inconvenience caused by the bottleneck being stuck when taking it out. Such a solid neck hole 501 structural design greatly improves the compatibility and ease of use of the weighing and stirring system for a variety of volumetric bottles.
[0048] Furthermore, it also includes a screw rod 8, which is arranged in the clamping cavity 503 and is threadedly connected to the pushing ring 7. The guide rod 9 is arranged in the clamping cavity 503. The pushing ring 7 has a guide hole 702, and the guide rod 9 is arranged in the guide hole 702.
[0049] In this embodiment, a screw rod 8 is designed, which is arranged inside the clamping cavity 503 and is connected to the push ring 7 by a thread. By screwing the screw rod 8, the operator can control the push ring 7 to move forward and backward along the thread direction, thereby driving the arc-shaped clamping piece 601 to swing, so as to achieve the clamping or loosening of the bottleneck of the volumetric flask. A guide rod 9 is also arranged inside the clamping cavity 503, and a guide hole 702 matching the guide rod 9 is arranged on the push ring 7. The guide rod 9 is placed in the guide hole 702 to ensure that the push ring 7 moves in a straight line along a preset trajectory during the movement process to prevent deflection or shaking, thereby accurately controlling the movement of the arc-shaped clamping piece 601 and ensuring the stability and reliability of the fixing effect on the volumetric flask. Through such a design, not only the convenience and flexibility of the weighing and stirring system operation are improved, but also the stable fixation of the volumetric flask is effectively guaranteed, and the accuracy of the weighing and stirring process is ensured.
[0050] Furthermore, the inner wall of the clamping cavity 503 has a mounting portion 507 and also includes a plurality of elastic members 10 , one end of which acts on the mounting portion 507 and the other end acts on the outer wall of the arc-shaped clamping piece 601 to provide a force for the arc-shaped clamping piece 601 to approach the flexible member 502 .
[0051] In this embodiment, a mounting portion 507 is provided on the inner wall of the clamping cavity 503 for mounting a plurality of elastic members 10. One end of these elastic members 10 is fixed on the mounting portion 507, and the other end acts on the outer wall of the arc-shaped clamping piece 601. When the elastic member 10 is in a natural state, a continuous force is applied to the arc-shaped clamping piece 601, so that the arc-shaped clamping piece 601 tends to approach the flexible member 502, thereby generating a clamping force on the bottleneck of the volumetric flask inserted therein. In actual operation, the position of the push ring 7 is first adjusted to compress the elastic member 10, and the arc-shaped clamping piece 601 is away from the flexible member 502, so as to facilitate the insertion of the volumetric flask. After the bottleneck of the volumetric flask is inserted into the fixed neck hole 501, the position of the push ring 7 is adjusted so that the clamping force provided by the elastic member 10 can ensure that the volumetric flask can basically remain stable without external auxiliary clamping, thereby improving the stability and practicality of the weighing and stirring system.
[0052] Furthermore, the arc-shaped clamping piece 601, the neck fixing piece 5, and the flexible piece 502 are all transparent pieces.
[0053] In this embodiment, the arc-shaped clamping piece 601, the neck fixing piece 5 and the flexible piece 502 are all made of transparent materials, so that the whole device can provide a visual effect during operation. It can make the operator's observation more convenient: because the transparent material allows the user to clearly see whether the bottleneck of the volumetric flask is correctly placed in the flexible piece 502, and whether the arc-shaped clamping piece 601 provides the appropriate clamping force for the volumetric flask, it is easy to find and adjust possible problems in time. Safety monitoring, the transparent design allows the condition of the liquid inside the volumetric flask to be observed in real time during the stirring process, such as the degree of stirring uniformity, whether bubbles are generated, etc., which helps to improve the controllability and safety of the experiment. Cleaning inspection, the transparent material is easy to clean and inspect, and it can quickly confirm whether there are residues or stains, ensuring the cleanliness and repeatability of the experiment. Through such a design, the functionality of the entire weighing and stirring system has been significantly improved.
[0054] Furthermore, the bottom fixing seat 2 , the weighing seat 3 and the neck fixing member 5 are all in multiple numbers and are arranged on the base 1 .
[0055] In the present embodiment, the bottom fixing seat 2, the weighing seat 3 and the neck fixing member 5 are designed to be multiple and arranged on the base 1. Specifically, the bottom fixing seat 2, the weighing seat 3 and the neck fixing member 5 are arranged and combined as needed to form a multi-station weighing and stirring system, which can handle the liquid preparation tasks of multiple volumetric flasks at the same time. Each bottom fixing seat 2 is equipped with a liftable weighing seat 3, on which a magnetic stirrer 4 and a neck fixing member 5 are installed to meet the weighing and stirring requirements of a single volumetric flask. Since these components are arranged in an arranged manner, users can choose to perform single or multiple manual liquid preparation steps at the same time according to actual work needs, which greatly improves laboratory work efficiency and saves experimental time. At the same time, this modular multi-station design is also convenient for daily maintenance and overhaul of the equipment, and the number of stations can be flexibly increased or decreased according to actual conditions to meet the needs of experiments of different scales.
[0056] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. Weighing and stirring system, characterized in that: include Base (1), A bottom fixing seat (2), the bottom fixing seat (2) being arranged on the base (1), the bottom fixing seat (2) having a first fixing cavity (201), A weighing seat (3), the weighing seat (3) being arranged in a lifting manner in the first fixed cavity (201), having a weighing platform (301), and a temperature regulating device (302) being arranged on the weighing platform (301). a magnetic stirrer (4), wherein the magnetic stirrer (4) is arranged on the weighing seat (3), and the weighing platform (301) and the magnetic stirrer (4) are respectively located on the upper and lower sides of the weighing seat (3). A neck fixing piece (5), the neck fixing piece (5) being arranged above the bottom fixing seat (2) and having a neck fixing hole (501).
2. The weighing and stirring system according to claim 1, characterized in that: The inner wall of the neck fixing hole (501) is a flexible member (502).
3. The weighing and stirring system according to claim 2, characterized in that: The neck fixing member (5) has a clamping cavity (503) and further comprises A clamping device (6), wherein the clamping device (6) is arranged in the clamping cavity (503), and the neck fixing hole (501) and the clamping device (6) are respectively located on two sides of the flexible member (502).
4. The weighing and stirring system according to claim 3, characterized in that: The clamping device (6) comprises An arc-shaped clamping piece (601) is swingably arranged in the clamping cavity (503), and moves closer to or farther from the flexible member (502) after swinging, and is arranged in a plurality of circles.
5. The weighing and stirring system according to claim 4, characterized in that: Also includes A push ring (7), the push ring (7) is slidably arranged in the clamping cavity (503), and has a through channel (701), the arc-shaped clamping piece (601) passes through the through channel (701), and an inner wall of one side of the through channel (701) abuts against the arc-shaped clamping piece (601), and the push ring (7) pushes the arc-shaped clamping piece (601) to swing after moving.
6. The weighing and stirring system according to claim 2, characterized in that: The solid neck hole (501) has a smooth transition portion (504), a columnar portion (505) and a tapered portion (506) from top to bottom, and the cross-section of the tapered portion (506) gradually increases from top to bottom.
7. The weighing and stirring system according to claim 5, characterized in that: Also includes a screw rod (8), wherein the screw rod (8) is disposed in the clamping cavity (503), and the screw rod (8) is threadedly connected to the push ring (7). A guide rod (9), wherein the guide rod (9) is arranged in the clamping cavity (503); the push ring (7) has a guide hole (702), and the guide rod (9) is arranged in the guide hole (702).
8. The weighing and stirring system according to claim 4, characterized in that: The inner wall of the clamping cavity (503) has a mounting portion (507), and further includes An elastic member (10), wherein the elastic member (10) is in plurality, one end of which acts on the mounting portion (507) and the other end of which acts on the outer wall of the arc-shaped clamping piece (601), thereby providing a force for the arc-shaped clamping piece (601) to approach the flexible member (502).
9. The weighing and stirring system according to claim 4, characterized in that: The arc-shaped clamping piece (601), the neck fixing piece (5), and the flexible piece (502) are all transparent pieces.
10. The weighing and stirring system according to claim 1, characterized in that: The bottom fixing seat (2), the weighing seat (3) and the neck fixing member (5) are each in a plurality and are arranged in an arranged manner on the base (1).