Holding device

Abstract

To provide a gripping device for gripping an aerosol can material with uniform surface pressure.SOLUTION: The invention relates to a gripping device (1) for gripping a thin-walled aerosol can material, having a base body (3) which is manufactured from a form-stable material and which has a bore (14) passing through the bore along a central axis (12). An inner surface of a bore portion (14) is provided with a circumferential groove (5) extending radially outward, and has a gripping ring (4) received in the circumferential groove (5) and manufactured from a rubber-elastic material, the gripping ring has a radially inner gripping surface and a radially outer working surface. The working surface has mutually facing axial surfaces (34) in the radial groove (5) and a radially outer circumferential surface (44) of the radial groove (5), and delimits a fluid working chamber (45). An integrally formed circumferential sealing portion is formed on the gripping ring (4) adjacent to the working surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention provides The present invention relates to a gripping device for gripping thin-walled aerosol can semi-finished products, The gripping device has a base body, Made from shape-stable materials And , and Along the central axis hand hole Department penetrates death , at that time , hole The inner surface of the portion extends radially outward. Radial groove There is a , Moreover, this gripping device is housed in a groove hand, A gripping ring made of an elastomeric material have , this gripping ring is air Zoe L Semi-finished cans and a radially inner gripping surface and a radially outer working surface for abutting against the this The action surface is Radial the opposing axial faces of the groove and Radial Radial outer side of the groove of peripheral surface With a fluid working chamber, in particular a compressed air working chamber, Define R , gripping device is. [Background technology]

[0002] Patent Document 1 (JPH0919731A) discloses a container holding element. In this container holding element, a base body has a ring-shaped groove on the inner periphery. Department The ring-shaped groove is provided with a container holding member. element This container is housed in element is elastic Ingredients and is radially movable, with the container holding element and the groove Defined by By supplying air into the passage, the outer inner side of the container holding element ,half Acts radially inward Pressure is applied to fix the container . [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-19731 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of this invention is to provide a uniform surface pressure Zoe L Semi-finished cans The present invention provides a gripping device for gripping a [Means for solving the problem]

[0005] This issue is Adjacent to the surface of action To the gripping ring is one body Target Molded Surrounding This is achieved by the formation of a sealing contour. The sealing contour ensures a sealed accommodation of the gripping ring. In the radial groove Protected by It is proved, This will , the fluid actuation chamber Define In this case, , grip Holding ring to Together Target molding The sealed contours ensure Reduces the number of sealing surfaces required The advantage is that can be, this is , from the prior art known So that, In separately formed sealing devices, the radial Between the groove and the gripping ring Sealed surface It must be established This is because what was previously needed is no longer needed here. . therefore , the compressive force acting on the working surface of the gripping ring The advantageous transmission of , temporarily fixed will be Should Air Zoe L Bring to can semi-finished products In particular, the gripping ring teeth, The contour of the holding ring is removed by air from the holding ring. Zoe L Semi-finished cans The outer surface of the bearing can be formed to ensure a desired uniform force transmission to the outer surface of the bearing.

[0006] Advantageous developments of the invention are the subject of the dependent claims.

[0007] Sealed contour but In the case of having two contour regions arranged symmetrically with respect to a symmetry plane, Suitable wherein the plane of symmetry is oriented transversely to the central axis, and each contoured region is at least essentially oriented in the axial direction to ensure a desired sealing effect between the base body and the gripping ring. Radial Seal on the side of the groove Engage Preferably, Radial Grooves facing each other do The sides are oriented parallel to each other and the respective contoured areas are sealed. Engage It is contemplated that the axially extending portions of the axially extending portion ...

[0008] Preferably, the working surface but an extension portion that is larger than the gripping surface in the axial direction; and The partial area of ​​the working surface which projects beyond the gripping surface along the central axis forms, together with the contoured area, an annular portion which is formed coaxially with respect to the central axis. It is set up so that On the other hand, such a gripping ring structure Now, let us consider the expanded working surface relative to the gripping surface as follows: on the one hand, On the gripping surface Transfers compression forces in an advantageous way On the other hand, Surface of action Protruding beyond the gripping surface in the axial direction Ru Department The division region transmits compressive force. To be able to , and therefore, each contour region against , radially inward to Power Communication Used to It is set up so that It is possible.

[0009] In a further development of the invention, the contoured region has at least one sealing surface facing radially inwards. It is designed to , this sealing surface But, Base body Radially outward, especially cylindrical On the support surface , seal engagement It is formed to do.In this case, the sealing effect between the respective contoured region and the base body is advantageously caused by a compressive force acting radially inwards. ,workman a Zoe L For semi-finished cans release position (In this released position the sealing ring has a larger inner diameter) and ,workman a Zoe L Locking for semi-finished cans position (In this locked position the sealing ring has a small inner diameter) Between in relative to the sealing ring luck The movement is only slightly, or preferably not at all, affected by frictional forces. , pressure of contraction influence By Locked from released position Movement to a position, at least mostly, without friction Can do , in which case the complete sealing effect for the sealing ring on the base body is rock However, when the sealing ring is moved from the release position rock Move to position line Considering the small amount of fluid required to achieve this, this is not really important. This form of sealing ring provides a kind of valve function, because: The fluid pressure in the fluid actuation chamber is When it decreases , the sealing ring rock elastic from the released position to the At the stage where reverse deformation begins , the sealing effect between the inward sealing surface of the sealing ring and the outward supporting surface of the base body but is released, and thus, reverse Transform By and released Ta Sealing ring and base Suhon body and Through the gap between The working fluid Fluid actuation chamber Rasa and others to leakage There is a possibility that R Because This behavior is particularly advantageous when compressed air is used as the working fluid.

[0010] In a further embodiment of the invention, the contour region comprises ,half a first sealing surface facing radially inward; the first sealing surface having a first inner diameter. and ,half a second sealing surface facing radially inward the second sealing surface having a second inner diameter.wherein the first inner diameter is greater than the second inner diameter; and The base body is designed to define a first support surface facing radially outward opposite the first sealing surface and a second support surface facing radially outward opposite the second sealing surface, thereby allowing the fluid working chamber to receive the pressurized working fluid. case Between the sealing ring and the base body in The resulting sealing effect also reduces the working fluid in the working chamber. of If the pressure drops to , between the sealing ring and the base body action The sealing effect can also be preset in an advantageous manner. Based on the release position of the sealing ring, When pressurizing the fluid working chamber To, First, From the gripping surface In the axial direction Come on The second sealing surface, which is located at a greater distance from the gripping surface, contacts the oppositely located end surface, while the first sealing surface, which is located at a closer distance from the gripping surface, contacts the oppositely located end surface when the fluid actuation chamber is subjected to increasing pressure. Finally , opposite In the position In this case, the second sealing surface ensures a temporary seal of the fluid actuation chamber, while the central region of the sealing ring, including the gripping surface, contacts the end surface of the sealing ring. luck Preferably, the first sealing surface and the support surface facing the base body, as well as the gripping surface and the air to be gripped, are Zoe L Semi-finished cans The gripping surface and air Zoe L Semi-finished cans Between Noha face whole To ensure as uniform a surface pressure as possible across the seal ring Garo When approaching the lock position, the smallest possible expansion is required for the gripping surface. occurs They are coordinated with each other so that

[0011] It is preferably provided that the axial extension of the first sealing surface is greater than the axial extension of the first support surface and / or the axial extension of the second sealing surface is less than the axial extension of the second support surface. By measures , the sealing ring is in the release position and rock This is to ensure that it is always possible to move between positions and vice versa with near-frictionless precision.

[0012] Radial It is advantageous if the distance between the opposing axial faces of the groove is greater than the distance between the opposing axial ring faces of the gripping ring that are adjacent to the gripping face and that face the axial face, respectively. Measures By That , the sealing ring, the release position and rock Essentially frictionless relative movement between positions is guaranteed.

[0013] The present invention in the era alternative 1st In an embodiment, each wheel The contoured region includes an expansion ring extending radially outward from the working surface; Expanding Ring Radially outward Distributed to With the retaining ring placed In doing so, Expansion and Retaining Rings and are arranged coaxially with respect to the central axis, At that time, Expanding Ring Extends along the central axis The extension of the retaining ring Extends along the central axis less than 50 percent of the extension, And at that time, Retaining ring teeth , at least one support surface of the base body facing radially outward Some In particular, it is fixed immovably to the base body. do. In this embodiment of the gripping device, the gripping ring has an inner ring. It is designed to , this an inner surface of the inner ring forming a gripping surface; Inner ring of the cutlet The outer surface of the do. Preferably, the inner ring is Radial groove to having an axial extension that is less than the distance between the opposing axial faces It is set up so that On the one hand, to ensure a reliable centering of the inner ring of the base body, and on the other hand, to Radial To ensure the necessary seal between the groove and the work surface, two spaced apart expansion rings extend from the work surface, each connected to a retaining ring located radially outward, which in turn secures the gripping ring to the base body. And The expansion ring is secured to the base body by a retaining ring, which is preferably fixed to the base body, and the expansion ring is secured to the base body by a retaining ring, which is preferably fixed to the base body. luck This serves to provide a flexible connection between the inner ring and the movably arranged inner ring.

[0014] The present invention in the era alternative 1st In a further development of the embodiment, the expansion ring and the retaining ring and The contour area formed by but , T-shaped in the cross-sectional plane containing the central axis of having a contoured portion, and / or contour area but , housed in a circumferential groove in the base body It is designed to The circumferential groove is T-shaped in a cross-sectional plane including the central axis. of having a contoured portion, mosquito along the central axis Extend, Spaced apart from each other R, Radially outward of , two cylindrical support surfaces teeth , support ring In , radially inward 、 Cylindrical support surface of, To abut in a meshing engagement manner do. T-shaped contour area of T-shaped to fit the contour and the circumferential groove in the base body of By contour , Be Base body against Gripping ring Certain This is because the inner ring is supported by the expansion ring. handThe tension force acting on each associated retaining ring is transmitted from the retaining ring to the opposing cylinder of the base body. shape Condition of At least approximately symmetrical on the support surface target In this way, the L-shaped retaining ring of At the contour Likely to occur The desired shape of the retaining ring is asymmetrically shaped. Shiku There is no tilt prevention will be done.

[0015] In a second alternative embodiment of the present invention, the contoured region in a cross-sectional plane containing the central axis tapers radially outward in a wedge-like manner. Rini Formed and Grasping Ring Gu In the radial direction, was established , special half circular Condition The grooves that define the contour of the mosquito It is Radial Groove Located on the opposite side configured for sealing engagement with axial surfaces It is set up so that In this case, the contour area is It is formed in a shape similar to a lip seal. , This lip seal is Inner ring to It is integrally formed, mosquito When pressure is applied to the fluid actuation chamber, the The swirling motion of the radially outer end region is Action , which allows them to be placed adjacent to each other. Also, radial The sealing engagement of the contoured area with the axial surface of the groove is ensured. Setting The groove , grip Use the holding device as prescribed. If you do, Guangdong area Radially outward For edge regions do The desired pivoting motion is designed to provide a reliable sealing effect for the fluid actuation chamber. for From the surface Each contour area Remove it role There is.

[0016] All embodiments of the present invention inThe base body preferably has an interface portion formed rotationally symmetrically with respect to the central axis, Interface section However, the storage area of ​​the workpiece turntable of the processing machine, especially the suction machine, Concatenation It is formed to case It is advantageous to

[0017] Advantageous embodiments of the invention are illustrated in the drawings. [Brief explanation of the drawings]

[0018] [Figure 1] 1 shows a schematic cross-sectional view of a first embodiment of a gripping device. [Figure 2] 10 shows a detailed view of the contour of the gripping ring. [Figure 3] 1 shows a schematic cross-sectional view of a portion of a second embodiment of a gripping device. [Figure 4] 10 shows a schematic view of a portion of a third embodiment of a gripping device. DETAILED DESCRIPTION OF THE INVENTION

[0019] The first embodiment of the gripping device 1, which is only diagrammatically shown in FIG. 1, is an air gripping device, which is only diagrammatically and partially shown. Zoe L Semi-finished cans 2. Preferably, air Zoe L Semi-finished cans 2 is manufactured from aluminum alloy as a cylindrical sleeve with a bottom on one side and is well below 0.1 mm wall Such an air Zoe L Semi-finished cans 2 is plastically deformed in the open end region, for example, on a suction machine, so that after the plastic deformation is complete, a spray valve (not shown) can be attached. To perform such a plastic deformation process on a suction machine, an air Zoe L Semi-finished cans 2 must be securely fixed so that it can support the processing forces generated during processing. Modern air Zoe L Semi-finished cans2 The wall thickness is extremely Because it is thin ,air Zoe L Semi-finished cans 2 and the gripping device 1 So, OK As much as possible low As much surface pressure as possible wide across the area , and the transmission of force It is necessary. This means: air Zoe L Semi-finished cans Avoid the collapse of 2 It is possible.

[0020] The gripping device 1 is a single to example Show The gripping device 1 comprises a base body 3 made up of a plurality of components, as an example. The components of the base body 3, which will be described in detail below, are made of materials that are dimensionally stable in the intended use of the gripping device 1. Typically, metal materials such as steel and aluminum, as well as synthetic resin materials such as POM (polyoxymethylene) or PEEK (polyetheretherketone), are used for the components of the base body 3. Furthermore, the gripping device 1 comprises a gripping ring 4 made of a rubber-elastic material, such as NBR (acrylonitrile butadiene rubber), which is formed on the base body 3. Radial It is housed in a groove 5 and is supplied with a pressurized fluid. Radial When supplying air to the groove 5, the air is moved from the stop position shown in FIG. Zoe L Semi-finished cans 2 in the gripping device 1 is secured.

[0021] single to example Show As a result, the base body 3 of the gripping device 1 includes a connecting portion 6, an intermediate ring 7, an outer ring 8, a guide ring 9, and a bottom ring 10. In this case, the intermediate ring 7, the guide ring 9, the bottom ring, and the gripping ring 4 are connected to the outer ring 8 (the outer ring 8 is a single ring). to example Show The clamping ring 4 is held in place by the intermediate ring 7, the outer ring 8 and the guide ring 9. Defined was Radial The base body 3 is accommodated with a certain degree of mobility in the groove 5. As a result, the base body 3 has a recess or hole 14 Define Furthermore, the base body 3 has an interface part 55 formed in the coupling part 6, and this interface part 55 is formed for fixing the gripping device to a workpiece rotating table (not shown) of a processing machine, in particular a suction machine.

[0022] As can be seen from the diagram in Figure 1, Radial Both the groove 5 and the gripping ring 4 have respective contours in a cross-sectional plane containing the central axis 12, which coincides with the plane of view in FIG. 1, and which can be described in the broadest sense as W-shaped. It should be noted here that the contours of the gripping ring 4 and Radial The contour of the groove 5 is formed at least approximately geometrically identical to the contour of the gripping ring 4. Radial The geometrical differences between the contours of the grooves 5 will be explained in detail below.

[0023] For example, the gripping ring 4 shown in detail in FIG. , within Side ring 15 and L-shaped of Contour Ring 17 This can be explained as a combination of Inner ring 15 has a rectangular cross section, and this contour ring 17 is attached to the inner ring 15 in a mirror-symmetrical manner with respect to the mirror surface 16. In this case, the contour area of ​​the gripping ring 4 Also called The contour rings 17 are of L-shaped inward radial direction Legs , forming a sealing contour 43.

[0024] single to example Show As, As shown in Figures 1 and 2, Gripping ring 4 of In the release position And grab Inner surface 19 of retaining ring 4 (This inner surface 19 is also called the gripping surface.) The inner diameter 18 of the air Zoe L Semi-finished cans The outer diameter of 2 is slightly larger than 60 It is set up so that This allows When the gripping ring 4 is in the release position, air Zoe L Semi-finished cans2 is pushed into the holding ring 4 ,ho It can be done with almost no friction.

[0025] The outer surface 20 of the clamping ring 4, which is radially outward, is also called the working surface and has an outer diameter 21, as shown in FIG. Diameter 21 but, Radial grooves 5 The outer surface 20 corresponds to the first (smaller) inner diameter 22 of the peripheral surface 44 of the cylinder. Radial The second inner diameter 23 of the peripheral surface 44 of the groove 5 is larger than the outer diameter 21 of the outer surface 20, thereby Solution Release position Leave too 、 Zhou Surrounding The ring groove 24 Intermediate ring 7 Outer surface 20 and It is spaced apart from the side surface 25.

[0026] Each of the contour rings 17 has a single to example Show as yen Cylindrical The first sealing surface 26 is formed on the to example Show as yen Cylindrical and a second sealing surface 27 formed thereon. And, In this case, the first inner diameter 28 of the first sealing surface 26 is larger than the second inner diameter 29 of the second sealing surface 27. Ku 2, the inner ring 15 has an axial extension 30. The first sealing surface 26 has an axial extension 31. The second sealing surface 27 has an axial extension 32.

[0027] For example, it is formed geometrically in the same way as the contour of the gripping ring 4. Radial Groove 5 is The gripping ring 4 is radial direction In accordance with versus luck motion If you do It is intended that the friction loss is minimized as much as possible. Intermediate ring 7 Axially oriented hand opposite each other existThis is ensured by the fact that the distance 33 between the ring surfaces 34 is greater than the axial extension 30 of the inner ring 15. ,half a first radially outward support surface 36 (The first support surface 36 is formed in the same manner on both the intermediate ring 7 and the guide ring 9.) Axial extension 35 teeth , is selected to be smaller than the axial extension 31 of the first sealing surface 26. ,half a second radially outward supporting surface 38 (This second support surface 3 is formed in the same manner on both the intermediate ring 7 and the guide ring 9.) It is contemplated that the axial extension 37 of the first sealing surface 27 is selected to be greater than the axial extension 32 of the first sealing surface 27 .

[0028] In addition, as can be seen from FIGS. 1 and 2, the intermediate ring 7 and the guide ring 9 each It is contemplated that the first outer diameter 40 of the first support surface 36, which is formed in a similar manner, is selected to be smaller than the first inner diameter 28 of the first sealing surface 26. Additionally or alternatively, the intermediate ring 7 and the guide ring 9 may have a first outer diameter 40, which is smaller than the first inner diameter 28 of the first sealing surface 26, as can be seen from the views of FIGS. each It is contemplated that the second outer diameter 41 of the second support surface 38 , which is similarly formed, is selected to be smaller than the second inner diameter 29 of the second sealing surface 27 .

[0029] this Measures By That , Radial Groove 5 and , grip Outer surface 20 of retaining ring 4 (This outer surface 20 is also called the working surface.) and by Defined R attitude A fluid working chamber 45 Pressurize Ta case First, the gripping ring 4 is for the base body 3 As little friction as possible Few Good phase Against Luck motion Do , this relative motion is Tightening motion can be considered as , diameter of the gripping ring 4 but reduction vinegar To can be sure In this case, the holding ring 4 and Radial Based on the geometric shape of the groove 5, a certain amount of leakage arisingAs a result, the pressurized working fluid entering the fluid working chamber 45 teeth, At least partially radially inward Out However, the original As a rule , some leakage There is Nevertheless, it is assumed that the desired radial displacement of the retaining ring 4 and the associated reduction in the diameter of the retaining ring 4 occur. Radial The geometric shape of the groove 5 is Diameter reduction In the process, figure, The second sealing surfaces 27 are adjusted to each other so that they are in sealing engagement with the second support surface 38. This prevents the pressurized fluid from flowing radially inward. interval to More flow Body actuation chamber 45 Inside The fluid pressure of moreover As it rises, it allows radial inward displacement of the inner ring 15. , within Inner surface 19 of side ring 15 (This inner surface 19 is also called the gripping surface.) No undesirable bulging occurs. This , the inner surface 19 is the air Zoe L Semi-finished cans 2 outer surface 61 and flat Furthermore Contact and therefore air Zoe L Semi-finished cans 2 is fixed in the gripping device 1 by frictional engagement. Can do.

[0030] However, the air in the gripping device 1 Zoe L Semi-finished cans This frictional engagement of the two is typically achieved by air Zoe L Semi-finished cans This is only possible when the bottom area 62 of the bottom ring 10 is frictionally received within the bottom ring 10, and this bottom ring is to example Show 4, which is rotatably accommodated in the intermediate ring 7, and which is supported for rotational movement at the axial end 50 of the connecting part 6 via a needle roller bearing 49, not shown in detail.

[0031] air Zoe L Semi-finished cans It is intended to create a pressure drop in the fluid working chamber 45 in order to release 2. For this purpose, a ventilation valve (not shown) connected in fluid communication with the fluid working chamber 45 is provided to allow the pressurized working fluid, in particular compressed air, to escape from the fluid working chamber 45. allocation It can be envisaged that the device is operated by a control device (also not shown) provided therein.

[0032] The rubber elasticity of the gripping ring 4 twist , not shown rock From the position in Figs. Solution To the released position, the gripping ring 4 undergoes an elastic recovery, which is equal to the diameter of the gripping ring 4. expands . Accordingly And air Zoe L Semi-finished cans 2 is released so that it can be removed from the gripping device 1 by means of a pull-out tool (not shown). , Canada Pressure on the compressed working fluid When the pressure is lowered in the fluid actuation chamber , The geometrical characteristics of the gripping ring 4 and the radial grooves 5, as described in more detail above, allow for allocation the second sealing surface 27 from the second support surface 38 but Lifting Gari , an additional gap is opened through which pressurized working fluid can flow radially inward from the fluid working chamber 45, thereby enabling even faster reverse deformation of the gripping ring 4.

[0033] In a development not shown in detail in the gripping device according to FIG. 1, it is provided that at least one radially inward recess is formed on the outer surface of the gripping ring 4 in order to ensure a stop against rotation relative to the gripping ring 4, into which a pin connected to the outer ring engages.

[0034] It should be noted that in a variant not shown in detail in FIG. 1, the bottom ring is machined integrally with the intermediate ring, in which case the rotatable bearing for the bottom ring is omitted.

[0035] In the second embodiment of the gripping device 71 shown in FIG. 3, the base body 81 is basically the same as the base body 3. Na structure and As a result, for the individual components of the base body 81, repetition To avoid confusion, the clamping ring 4 will not be described in more detail. as well as , the gripping ring 72 is omitted Rectangular cross section have Inner ring 73 Preparation In the axial end regions of the gripping ring 72, contoured regions 76 are arranged mirror-symmetrically with respect to the mirror surface 75, and adjoin the outer surface 73, also called the working surface. death, The contoured region extends radially outward and forms a sealing profile 88. Each contoured region 76 includes an expansion ring 77 directly connected to the inner ring 73 and a retaining ring 78 attached to the outside of the expansion ring 77. As an example, The radial extension of the expansion ring 77 is Raise the outer surface 74 As a point hand, Approximately coincident with the radial extension of the inner ring 73 It is set up so that Furthermore, to example Show As the axial extension of the expansion ring 77 teeth , which corresponds to less than 10% of the axial extension of the inner ring 73 It is set up so that In contrast, the axial extension of the retaining ring 78 is selected to correspond to at least twice the axial extension of the expansion ring 77. Particularly preferably, the retaining ring 78 is essentially centrally arranged relative to the expansion ring 77. And, As a result, the contour area 76 for, basically T-shaped of The outline formation The base body 81 is used to accommodate the gripping ring 72. Radial The groove 87 is shaped to be geometrically similar to the gripping ring 72, at least in certain areas.

[0036] As can be seen from the drawing in FIG. 3, the first and second radially inward sealing surfaces of the retaining ring 78 belong to the base body 81 of the gripping device 71; OppositeThe support is supported by first and second support surfaces disposed thereon. child This ,figure 3 show Solution release position Even in , ensuring a sealing effect on the fluid working chamber 84. The geometrical shapes of the expansion ring 77 and the retaining ring 78 allow pressure to be applied to the fluid working chamber 84, so that a reduction in the diameter of the inner ring 73 essentially leads to an elastic deformation of the expansion ring 77, while the retaining ring 78 remains dimensionally stable, at least to a large extent. Due to its geometrical shape, the expansion ring 77 is significantly smaller than the inner ring 73. expensive Because of its elasticity, the fluid actuation chamber 84 is pressurized, and This As the inner diameter 85 of the gripping ring 71 becomes smaller, the gripping ring 72 rotates in a circular motion relative to the inner surface 86 thereof. Cylindrical form of Since it is maintained, As a result, the inner surface 86 comes into surface contact with the semi-finished aerosol can (not shown), Inner surface 86 and air Zoe L Semi-finished cans Undesirable non-uniformity in the surface pressure between There is no .

[0037] In the third embodiment of the gripping device 91 shown in Fig. 4, the gripping ring 92 comprises an inner ring 93 with a substantially rectangular cross section, corresponding to the gripping ring 4 according to Figs. 1 and 2. The axial end regions of the cylindrical outer surface 94 of the gripping ring 92 are provided with radially inwardly directed circumferential grooves 96, which are arranged mirror-symmetrically with respect to a mirror surface 95. By way of example only, the circumferential grooves 96 each have a semicircular cross section. In this case, the circumferential grooves 96 are provided in the axial end regions of the gripping ring 92 so as to form wedge-shaped tapered contoured regions 97, which, due to their reduced material thickness, have a significantly higher flexibility than the remaining regions of the gripping ring 92 and form sealing contours 103. When pressure is applied to the fluid actuation chamber 100 formed between the gripping ring 92 and the radial grooves 99 in the base body 98, the contoured regions 97 sealingly engage with the adjacent ring surfaces 101 of the radial grooves 99, which, by way of example, are formed in the shape of circular rings. This ensures a sealed fluid actuation chamber 100. Further pressure builds up in the fluid actuation chamber 100, which causes an elastic deformation of the gripping ring 92. This elastic deformation is accompanied by a reduction in the inner diameter 101 of the gripping ring 92, thereby securing the aerosol can blank to the inner surface 102 of the gripping ring 92 (also referred to as the gripping surface) in the desired frictional engagement manner. As can be seen from the view in FIG. 4, the radial grooves 99 have a rectangular cross section in the plane of the view in FIG. 4. As a result, the base body 98 can be manufactured at particularly low cost. This is equally valid for gripping rings 92 that do not have a complex geometric shape. The present application relates to the invention described in the claims, but also includes the following as other aspects. 1. A gripping device (1; 71; 91) for gripping a thin-walled aerosol can semi-finished product (1), The gripping device (1; 71; 91) comprises a base body (3; 81; 98) made of a shape-stable material and having a hole (14) extending therethrough along a central axis (12); the inner surface of the hole (14) is provided with radial grooves (5; 87; 99) extending radially outward, and a gripping ring (4; 72; 72) made of a rubber-elastic material is housed in the radial grooves (5; 87; 99), the gripping ring having a radially inner gripping surface (19; 86; 102) and a radially outer working surface (20; 74; 94) for abutting against the aerosol can blank (2); said working surfaces (20; 74; 94), together with the mutually facing axial faces (34) of said radial grooves (5; 87; 99) and with the radially outer peripheral faces (44) of said radial grooves (5; 87; 99), define fluid working chambers (45; 84; 100), in particular compressed air working chambers; In the gripping device (1; 71; 91), the gripping ring (4; 72; 72) has an integrally formed circumferential sealing contour (43; 88; 103) adjacent to the working surface (20; 74; 94); A gripping device (1; 71; 91) characterized by: 2. the sealing profile (43; 88; 103) has two profile regions (17; 76; 97) arranged symmetrically with respect to a plane of symmetry (16; 75; 95), the plane of symmetry (16; 75; 95) being oriented transversely with respect to the central axis (12); The gripping device (1; 71; 91) according to item 1 above, characterized in that 3. The working surface (20) has an axially longer extension than the gripping surface (19), and a partial region of the working surface (20) together with the contoured region (17) forms an annular portion that is coaxial with the central axis (12), and this partial region projects beyond the gripping surface (19) along the central axis (12); 3. The gripping device (1) according to item 2 above. 4. the contoured region (17) has at least one radially inwardly facing sealing surface (26, 27) which is adapted to sealingly abut against a radially outwardly facing, in particular cylindrical, support surface (36, 38) of the base body (3); The gripping device (1) described in 3 above is characterized in that 5. The contoured region (17) has a first radially inwardly facing sealing surface (26) having a first inner diameter (28) and a second radially inwardly facing sealing surface (27) having a second inner diameter (29), wherein the first inner diameter (28) is larger than the second inner diameter (29); and The base body (3; 81; 98) is formed with a first support surface (36) facing radially outward and opposite the first sealing surface (26), and a second support surface (38) facing radially outward and opposite the second sealing surface (27). The gripping device (1) described in 3 above is characterized in that 6. the axial extension (31) of the first sealing surface (26) is greater than the axial extension (35) of the first support surface (36); and / or the axial extension (32) of the second sealing surface (27) is smaller than the axial extension (37) of the second support surface (38); 6. The gripping device (1) according to item 5 above. 7. The spacing (33) between the opposing axial surfaces (34) of the radial grooves (5) is the spacing (30) between the axial ring surfaces adjacent to the gripping surface (19) and facing the axial surfaces of the gripping rings (4; 72; 72), respectively, is greater than the spacing (30) between the axial ring surfaces not facing each other; 7. The grip ring (1) according to any one of the above items 3 to 6. 8. Each contoured region (76) has an expansion ring (77) extending radially outward from the working surface (74) and a retaining ring (78) disposed radially outward of the expansion ring (77); The expansion ring (77) and the retaining ring (78) are arranged coaxially with respect to the central axis (12), the extension of the expansion ring (77) along the central axis is less than 50 percent of the extension of the retaining ring (78) along the central axis; The retaining ring (78) at least partially abuts against radially outwardly facing support surfaces (82, 83) of the base body (81) and is in particular fixed to the base body (81). 3. The gripping device (71) according to item 2 above. 9. the contoured region (76) formed by the expansion ring (77) and the retaining ring (78) has a T-shaped contour in a cross-sectional plane containing the central axis (12); and / or The contoured region (76) is accommodated in a circumferential groove (87) of the base body (81), and the circumferential groove has a T-shaped contour in a cross-sectional plane including the central axis (12); and Two cylindrical support surfaces (82, 83) extending along the central axis (12), spaced apart from each other, and facing radially outward are The support ring (78) has radially inwardly facing cylindrical support surfaces (79, 80), Provided for mating engagement; 9. The gripping device (71) according to item 8 above. 10. In a cross-sectional plane including the central axis (12), the contoured region (97) has: tapered radially outward in a wedge shape; and the gripping ring (92) is separated from the working surface (94) by a groove (96) radially inwardly provided, in particular of semicircular contour; and formed for sealing engagement with an axial surface opposite the radial groove (99); 3. The gripping device (91) according to item 2 above. 11. the base body (3; 81; 98) has an interface part (55) which is preferably formed rotationally symmetrically with respect to the central axis, and which is designed for connection with a receiving part of a workpiece turntable of a processing machine, in particular a suction machine; The gripping device (1; 71; 91) according to any one of 1 to 10 above, characterized in that:

Claims

1. A gripping device (91) for gripping an aerosol can semi-finished product (2), The gripping device (91) has a base body (98) made of a shape-stable material and having a hole (14) extending therethrough along a central axis (12); the inner surface of the hole (14) is provided with a radial groove (99) extending radially outward, and a gripping ring (92) housed in the radial groove (99) and made of a rubber-elastic material, the gripping ring having a radially inner gripping surface (102) and a radially outer working surface (94) for abutting the aerosol can blank (2); the working surface (94) together with the opposing axial faces (34) of the radial grooves (99) and the radially outer peripheral surface (44) of the radial grooves (99) define a fluid working chamber (100); The gripping ring (92) has an integrally formed circumferential sealing contour (103) adjacent the working surface (94); The sealing profile (103) has two profile regions (97) arranged symmetrically with respect to a plane of symmetry (95), said plane of symmetry (95) being oriented transversely to the central axis (12); Each contoured region (97) is formed to sealingly engage with a side surface of the radial groove (99) arranged at least along the axial direction, thereby ensuring a desired sealing effect between the base body (98) and the gripping ring (92). In the gripping device (91), In a cross-sectional plane containing the central axis (12), the contoured region (97) has: (a) tapered radially outward in a wedge shape; and (b) separated from the working surface (94) by a radially inward groove (96) in the gripping ring (92); and (c) configured for sealing engagement with an axial surface opposite the radial groove (99); A gripping device (91) characterized in that

2. The base body (98) has an interface portion (55) which is configured to connect with a receiving portion of a workpiece rotating table of a processing machine.

2. The gripping device (91) according to claim 1 .

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