Precision Rocker Pin Type Load Support Device

Abstract

The present invention relates to a so-called rocker pin load cell, which is used in industrial weighing technology, particularly in platform or container scales. The rocker pin load cell comprises a base plate (1) in which a cylindrical recess (2) with a flat bottom surface (3) is coaxially formed, a rocker pin bolt (4) with a spherical lower surface (5) and a spherical upper surface (6), a rocker pin part (7) with a circular recess (8) whose diameter is larger than the diameter of the top of the rocker pin bolt (4) and a recess (9) formed in the center, and a bell-shaped cover (10) made of elastic plastic. A cover (10) is airtightly connected at its upper end to the rocker pin part (7) and airtightly connected at its lower end to the base plate (1); The characteristic feature of this invention is that the condition is observed that the volume of the gas or air is greater than the sum of the volumes of the rocker pin bolt and the rocker pin part that are surrounded by the air or gas.

Description

Technical Field

[0001] The present invention relates to a so-called rocker pin type used in platform-type or container-type weighing instruments, especially in industrial weighing technology. Various structural forms are known from the prior art, as described, for example, in German Patent No. 102016118046, European Patent No. 0315846, US Patent No. 4815547 or West German Patent No. 19625821. Load support device

Background Art

Background Art

[0002] The rocker pin type Load support device has the function of blocking the lateral force from the weighing cell, so that only the force caused by the mass of the material to be weighed acts on the weighing cell.

[0003] Industrial Total weighing technology has various requirements, such as special requirements for hygienic conditions in the food industry. Here, the production equipment integrated with the weighing instrument must be frequently cleaned and disinfected. This is carried out, for example, with steam or hot water sprayed onto the equipment parts under pressure. The steam or water is also mixed with a disinfectant. It is necessary that all parts of the production equipment are designed to be easily cleaned. That is, there should be no gaps or cavities that are not accessible during cleaning, because bacteria cultivation may occur therein, which must be eliminated in the food industry. Therefore, the rocker pin type Load support device must also be able to be reliably cleaned. The conventionally designed rocker pin type Load support device does not meet these requirements.

[0004] German Patent No. 102016118046 describes a rocker pin type Load support device which, according to the inventors, is suitable for use in the food industry.

[0005] However, in the pharmaceutical industry, the requirements for sterility are, in part, even higher. Furthermore, generally, higher requirements are also imposed on dosing accuracy, i.e., each pharmaceutical ingredient must, in part, be metered or dosed with higher accuracy than in the food industry.

[0006] Locker pin type Load support device uses point-like and / or line-like supports as bearing components in order to obtain the lowest possible frictional resistance. It is known that the so-called Hertz stress phenomenon occurs at the contact points, i.e., the contacting parts flatten. The magnitude of this flattening depends, in particular, on the force acting to press the parts against each other.

[0007] It is known from conventional metering techniques how the contact points of such bearing components should be designed and which materials are suitable for this purpose.

[0008] In mechanical precision metering technology, parts with particularly small linear, ring-shaped or point-shaped contact surfaces are required. However, this results in a very high surface pressure, and the contacting material surfaces are strongly loaded and worn. In the case of mechanical precision metering devices, it is intended that the so-called pan and the blade moving therein are exchangeable. This structural intention cannot be realized in the case of the locker pin support used in industrial metering device manufacturing. Therefore, in the case of the locker pin type Load support device it must be taken into account that the mobility of the, in particular, decreases over time, especially when humidity and, in some cases, aggressive cleaning agents and disinfectants reach the bearing surface. Furthermore, in the case of a considerable number of production facilities, stoppages are not desirable, and therefore, in the case of the locker pin type Load support device there is a problem that the movable components of the should have as long a service life as possible.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0010] Therefore, an object of the present invention is to provide a locker pin type having a long life that maintains its mobility throughout its entire life even under high humidity and the influence of aggressive detergents and disinfectants. Load support device to provide.

Means for Solving the Problems

[0011] The problem is solved by the locker pin type according to claim 1. Load support device is solved.

[0012] The locker pin type Load support device is characterized by having a base plate, preferably made of stainless steel, in which a cylindrical recess having a flat bottom is provided coaxially, a locker pin bolt having a spherical lower surface and a spherical upper surface, and a locker pin component having a cylindrical recess with a diameter larger than the diameter of the upper part of the locker pin bolt. A recessed part is provided at the center on the bottom surface of this cylindrical recess. The spherical lower surface of the locker pin bolt is placed on the flat bottom surface of the recess. The locker pin component is placed on the spherical upper surface of the locker pin bolt by the recessed part at its center. A bell-shaped cover made of elastic plastic is hermetically coupled to the locker pin component at the upper end and hermetically coupled to the base plate at the lower end.

[0013] The bell shape of the cover has various advantages: depending on the requirements, materials with different elasticity, heat resistance and other desirable properties can be used. Under the cover, a free space containing air or a special gas is formed. The volume of the gas or air is larger than the sum of the volumes of the rocker pin bolt and the part of the rocker pin component surrounded by the air or gas. This allows the enclosed gas to circulate easily, and the moisture contained in the gas remains constant throughout, thereby sufficiently avoiding moisture condensation due to temperature changes at specific locations, or causing the condensed moisture to quickly vaporize again. This is advantageous as, for example, the lubricant used thereby maintains its lubricity for a longer time.

[0014] According to claim 2, the cover is made of antibacterial plastic, which has advantages especially when used in the food and pharmaceutical industries.

[0015] According to claim 3, as an alternative to the subject matter of claim 2, only the outer surface of the cover is provided with an antibacterial coating.

[0016] According to claim 4, the cover consists of at least two material layers. Two or more materials Layer enhance the flexibility of the cover. The cover is more flexible and thus does not distort the force resulting from the mass to be measured. The outer layer of the cover can consist of a material with antibacterial action.

[0017] According to claim 5, a hygroscopic substance is encapsulated in the air or gas filling, and this hygroscopic substance keeps the humidity of the gas low. Thereby, the long-term effectiveness of the lubricant is achieved.

[0018] According to claim 6, the gas filling is an inert gas. Thereby, the long-term effectiveness of the lubricant is also achieved.

[0019] The present invention will be explained in more detail below with the aid of schematic diagrams.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0021] Figure 1 shows a rocker pin type Load support device in a perspective view. Figure 2 shows a rocker pin type Load support device in a cross-sectional view. The rocker pin type Load support device comprises a base plate 1 made of stainless steel with a cylindrical recess 2 having a flat bottom 3 provided on the upper surface, a rocker pin bolt 4 having a spherical lower surface 5 and a spherical upper surface 6, and a rocker pin component 7 having a cylindrical recess 8 with a diameter larger than the diameter of the upper part of the rocker pin bolt 4 and a conical immersion part 9 formed in the center. The lower part of the rocker pin bolt 4 is accommodated in the cylindrical recess 2 of the base plate 1, and the rocker pin component 7 is placed on the Spherical upper surface of the rocker pin bolt 4.

[0022] The bell-shaped cover 10 made of elastic plastic is hermetically coupled to the rocker pin component 7 at the upper end and hermetically coupled to the base plate 1 at the lower end. Preferably, the coupling at the upper end is an adhesive bond, but if necessary, the coupling can also be a clamp. The coupling with the base plate is preferably separable, for example, a clamp by screwing. The space under the cover 10 is filled with air or gas 11.

[0023] The rocker pin type according to Figure 3Load support device In this case, only the outer surface of the cover 10 is provided with an antibacterial coating 12. This has the advantage that, although the cover can be manufactured from a particularly flexible and airtight plastic, it nevertheless has the effect of antibacterial properties.

[0024] Locker pin type according to FIG. 4 Load support device The cover 10 consists of six material layers. This configuration has various advantages. Thus, the outer material layer can be selected to be thin but resistant to aggressive detergents. The inner layer consists of a particularly soft elastic material. The individual layers are not bonded to each other.

[0025] Locker pin type according to FIG. 5 Load support device In this case, a hygroscopic substance 13 is enclosed within the air or gas filling 11. This achieves the long-term effectiveness of the lubricant.

[0026] FIG. 6 shows the mounting state in which a locker pin type load cell mounted within the facility is being cleaned by a steam jet 14. Note that this application relates to the invention described in the claims, but may also include the following as other aspects. 1. · A base plate (1) in which a cylindrical recess (2) having a flat bottom surface (3) is formed coaxially, · A rocker pin bolt (4) having a spherical lower surface (5) and a spherical upper surface (6), · A cylindrical recess (8) having a diameter larger than the diameter of the upper part of the rocker pin bolt (4), and a rocker pin component (7) having an immersion part (9) formed at the center, · A bell-shaped cover (10) made of elastic plastic, having, The rocker pin bolt (4) is supported rotatably in the cylindrical recess (2) via the spherical lower surface (5), and supports the rocker pin component (7) rotatably via the spherical upper surface (6), The cover (10) is hermetically coupled to the rocker pin component (7) at the upper end and hermetically coupled to the base plate (1) at the lower end, thereby forming a space containing an air or gas filling (11), The condition that the volume (11) of the gas or air is larger than the total volume of the portions of the rocker pin bolt and the rocker pin component surrounded by air or gas is satisfied, A rocker pin type load support device characterized by that. 2. The cover (10) is made of antibacterial plastic, The rocker pin type load support device according to 1 above, characterized in that. 3. The cover (10) is provided with an antibacterial coating (12), The rocker pin type load support device according to 1 above, characterized in that. 4. The cover (10) is composed of at least two plastic layers, The rocker pin type load support device according to 1 above, characterized in that. 5. A hygroscopic substance (13) is enclosed in the air or gas filling (11), The rocker pin type load support device according to 1 above, characterized in that. 6. The gas filling (11) is an inert gas, The rocker pin type load support device according to 1 above, characterized in that.

Explanation of Symbols

[0027] 1 Base plate 2 Cylindrical recess of the base plate 3 Flat bottom surface of the cylindrical recess 4 Rocker pin bolt 5 Spherical lower surface of the rocker pin bolt 6 Spherical upper surface of the rocker pin bolt 7 Rocker pin part 8 Cylindrical recess inside the rocker pin part 9 Conical immersion part inside the rocker pin part 10 Bell-shaped cover 11 Air or gas filling 12 Antibacterial coating 13 Hygroscopic substance 14 Cleaning device

Claims

1. - A disc-shaped base plate (1) with a cylindrical recess (2) having a flat bottom surface (3) formed at the center, - A rocker pin bolt (4) having a spherical lower surface (5) and a spherical upper surface (6), - A cylindrical recess (8) whose diameter is larger than the diameter of the upper part of the rocker pin bolt (4), and a rocker pin component (7) having a conical immersion part (9) formed at the center within this recess, - A bell-shaped cover (10) made of elastic plastic, and having, The rocker pin bolt (4) is supported rotatably within the cylindrical recess (2) via the spherical lower surface (5), and supports the rocker pin component (7) rotatably at the central immersion part (9) via the spherical upper surface (6), The cover (10) is hermetically coupled to the rocker pin component (7) at the upper end and hermetically coupled to the base plate (1) at the lower end, whereby a space containing an air or gas filling (11) is formed under this cover (10), Characterized in that the condition that the volume (11) of the gas or air is larger than the total volume of the parts of the rocker pin bolt and the rocker pin component surrounded by air or gas is observed, a rocker pin type load support device.

2. The cover (10) is made of antibacterial plastic, characterized in that the rocker pin type load support device according to claim 1.

3. The cover (10) is provided with an antibacterial coating (12), characterized in that the rocker pin type load support device according to claim 1.

4. The cover (10) is composed of at least two plastic layers, characterized in that the rocker pin type load support device according to claim 1.

5. A hygroscopic substance (13) is encapsulated within the air or gas filling (11), characterized in that the rocker pin type load support device according to claim 1.

6. The gas filling (11) is an inert gas, characterized in that the rocker pin type load support device according to claim 1.

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