CLAMPING SYSTEM CONSISTING OF A CLAMPING DEVICE AND A COMBINATION BOLT

Description

[0001] The invention relates to a clamping system comprising a clamping device and a combination bolt according to claim 1, wherein the clamping device houses at least one annular piston and at least three clamping elements in the housing and also has an automatically closable receiving recess for temporarily receiving the combination bolt, wherein the combination bolt has two frustoconical clamping surfaces whose surfaces are inclined towards each other, wherein the housing base body and the clamping elements each have a frustoconical centering clamping or enveloping clamping surface whose surfaces are turned away from each other. The housing has a housing cover that abuts the housing base body.

[0002] To clamp a workpiece, for example, on the machine table of a machining center with repeatable accuracy and efficiency, at least one zero-point clamping system can usually be used. Instead of the workpiece, vises, pallets, or similar devices can also be fixed using this system.

[0003] A clamping system called "vb Dock Lock AirLine," published in September 2018 by Vischer & Bolli AG, a tool and clamping technology company from Dübendorf, Switzerland, is described in a brochure. The clamping device features a complexly shaped ring piston with a conical inner wall that acts on clamping segments mounted in a support ring. During the clamping process, these segments clamp onto a combination bolt that can be inserted into a receiving bore. When the clamping system is not in use, the receiving bore is sealed with a cap.

[0004] DE 10 2015 206 590 B3 describes a clamping module and a clamping system, in particular a zero-point clamping system, in which a clamping bolt can be clamped in a receiving bore. For this purpose, three slides arranged radially movable around the centerline of the clamping system are positioned in the clamping module, which support the clamping bolt so as to be laterally displaceable via flat wedge surfaces.

[0005] From DE 10 2016 116 282 A1, a movable holding mechanism for fixing a workpiece carrier to a clamping head is known. A combination bolt arranged on the workpiece carrier is inserted into the central bore of the clamping head for docking, where it is locked in place by means of a locking unit. The locking unit has several locking elements as clamping elements. The bolt-like clamping elements sit in bores of an upwardly open ball clamping sleeve, which receives the combination bolt when clamped.

[0006] In CH 691 042 A5, a clamping system according to the preamble of claim 1 for clamping various docking units onto a carrier plate is described. A combination bolt arranged on the docking unit is inserted into the central bore of the carrier plate for docking, where it is locked in place by means of a locking unit. The locking unit, designed in the form of a sleeve, has several locking balls as clamping elements.

[0007] The present invention is based on the problem of developing a clamping system consisting of a clamping device and a combination bolt, the components of which ensure high wear resistance, very good operational reliability with easy adaptability and a high pull-in force in a small installation space.

[0008] This problem is solved by the features of claim 1. A support tube is integrally formed on the housing body and a stop tube on the housing cover. The clamping elements are arranged as parts of a clamping ring, axially adjustable between the end face of the support tube and the end face of the stop tube. For the displacement of the clamping elements, the annular piston has a frustoconical annular groove wedge surface, which is spatially located between the upper and lower piston inner seals.

[0009] The invention provides a clamping system in which the clamping elements arranged in the clamping device make full contact with the combination bolt with their clamping surfaces. This results in relatively low surface pressures even under high tensile forces. The large contact areas guarantee high rigidity of the overall system, enabling the clamping device to easily support even large load moments via the combination bolt.

[0010] The clamping elements, which are components of a clamping ring assembled via elastomer bodies, together with an annular piston, form a wedge mechanism in which the axial stroke of the annular piston generates radial clamping forces acting on the clamping ring. The segment-like clamping elements are elastically coupled circumferentially via the elastomer bodies of the clamping ring. In the exemplary embodiment, the annular piston is moved into the clamping position of the clamping device by spring force and held there. If necessary, the clamping process is assisted by compressed air. Compressed air is used to release the tension on the clamping ring and to retract the annular piston—thus releasing the combination bolt. Additionally, the interior of the clamping device is pressurized with compressed air to prevent the ingress of chips, coolant, or lubricant during workpiece machining. Optionally, hydraulic oil can also be used to move the annular piston.

[0011] Further details of the invention will become apparent from the dependent claims and the following description of at least one schematically illustrated embodiment. Figure 1: Perspective view of a clamping system; Figure 2: Section through the unpressurized closed clamping system; Figure 3: Section through the closed clamping system with a pressurized annular piston base; Figure 4: as Figure 3 , however with the cleaning piston extended; Figure 5: Section through the clamping system with pressure-loaded ring piston front and with the combination bolt partially immersed; Figure 6: as Figure 5 , however with the combination bolt fully immersed but unlocked; Figure 7: how Figure 6, however, with the combination bolt locked by means of the spring tension of the ring piston; Figure 8: Tension ring from an oblique top view; Figure 9: Tension ring from an oblique bottom view; Figure 10: Top view of the tension ring; Figure 11: Perspective view of a closure cap from an oblique bottom view with the cleaning piston extended; Figure 12: as Figure 11 , but at an angle from the side; Figure 13: perspective view of the clamping system from below.

[0012] The Figure 1Figure 1 shows a clamping system (1) consisting of a clamping device (10) and a combination bolt (130). The clamping device (10) is integrated into a machine table, for example, to hold a workpiece. The workpiece to be clamped typically has at least one combination bolt (130) attached, which allows the workpiece to be adapted to the machine table. The housing (11) of the clamping device (10) contains a mechanism that positions the combination bolt (130) in the clamping device (10) with repeatable accuracy. This mechanism includes a wedge drive (63, 111) whose drive element is a ring piston (40).

[0013] The in Figure 2 The illustrated housing (11) essentially consists of a flange-like housing base (12) and a housing cover (31) located in the underside of the housing base (12). Both parts are made, for example, of the rust-, acid- and heat-resistant steel X90CrMoV18.

[0014] The one-piece housing body (12), e.g., 44 mm high, consists of a flange plate (13) and a cylinder (27) integrally formed thereon. The flange plate (13) has a diameter of 112 mm and a wall thickness of 10 mm. The cylinder (27) has an outer diameter of 86 mm and a maximum wall thickness of 6 mm. The flange plate (13) and the cylinder (27) share a common centerline (9). In the transition area between the cylinder (27) and the bottom of the flange plate (13), a chamfer (42), e.g., 5.5 mm wide and with a cone angle of 120 degrees, is provided to increase the rigidity of the housing body (12).

[0015] The flange plate (13) has, in its outer area that projects beyond the cylinder (27), for example eight countersunk holes distributed equidistantly around its circumference for receiving fastening screws (15), by means of which the clamping device (10) can be rigidly attached to the machine table. The countersunk holes are sealed dust-tight with plastic caps. Between each pair of countersunk holes, two precision-machined positioning slots (14), for example 17 mm long and 5.8 mm deep, are machined into the flange plate (13) from the outside. The single positioning slot (14) serves to lock the degree of rotational freedom about the center line (9) when using only one combination bolt (130).

[0016] After Figure 2The flange plate (13) has a channel system (24) on its left side, through which any back pressure present between the flange plate (13) and the workpiece can be fed to a measuring device via a contact port (25) to check that the workpiece is correctly supported. For this purpose, the flange plate (13) has an axial ring groove (29) on its upper surface, which, in the exemplary embodiment, has a depth of 0.3 mm with an inner diameter of, for example, 48 mm and an outer diameter of, for example, 74 mm. If the workpiece resting on the flange plate (13) completely covers the axial ring groove (29), the back pressure present in the latter can be used for verification. The area of ​​the axial ring groove (29) is at least 25% of the workpiece-bearing upper surface of the flange plate (13).

[0017] The flange plate (13), on whose upper surface the respective workpiece rests, has a central receiving recess (20) which is enclosed by a support tube (16) integrally formed on the flange plate (13). The inwardly projecting support tube (16) has a finely machined end face and a length of 9.5 mm. The wall of the support tube (16) facing away from the receiving recess (20) is a finely machined cylindrical surface for the internal guidance of the annular piston (40).

[0018] The receiving recess (20) has a truncated cone-shaped centering clamping surface (21) in its upper region, the cone angle of which is, for example, 30 degrees. The height of the centering clamping surface (21) measures, for example, 5.6 mm. In its lower region, the receiving recess (20) has a rear grip shoulder (23) that is widened in diameter by, for example, 1 mm.

[0019] The finely machined outer inner wall of the cylinder (27) has a circumferential venting groove (28) in the middle area.

[0020] The housing cover (31) is centered and sealed within the housing body (12) over the inner wall of the cylinder (27). It has a stop tube (32) projecting into the housing body (12) at its center, which surrounds a blind-hole-like recess for the closure cap (33). The latter has a diameter of 28 mm and a depth of 19.3 mm. The center lines of the stop tube (32) and the closure cap recess (33) lie on the center line (9). The stop tube (32) has at least one finely machined end face.

[0021] The outer wall of the stop tube (32) has a finely machined cylindrical outer wall, measuring 11.5 mm in height, which also serves to guide the annular piston (40) internally. The cover wall adjoining the stop tube (32) has a wall thickness of, for example, 10.5 mm. In this area, the housing cover (31) has twelve blind holes (34) arranged in a circle around the center line (9) for mounting and guiding helical compression springs (69). The blind holes (34) have a diameter of 10.6 mm and a depth of 7.3 mm.

[0022] With the clamping device (10) mounted, the distance between the end faces of the support tube (16) and the stop tube (32) is, for example, 6 mm. A clamping ring (100) is arranged between these end faces.

[0023] The clamping ring (100), see. Figures 8 and 9The clamping ring (100) is a ring assembled, for example, from three clamping elements (101) and three spring elements (121), whose cross-section is constant over the entire clamping ring (100). The segment-like clamping elements (101) are made of X90CrMoV18 steel. The spring elements are elastomer bodies (121) made of rubber or a rubber substitute material. Each clamping element (101) individually covers an angle of 85 degrees within the clamping ring (100), while the elastomer bodies (121) cover 35 degrees. In its undeformed state, the clamping ring (100) has an inner diameter of 23 mm and an outer diameter of 35 mm. Its axially measurable width is 0.015 mm smaller than the distance measured between the end faces of the support tube (16) and the stop tube (32). The inner diameter of the clamping ring (100) can be elastically expanded to, for example, 27 mm if required, cf. Figure 5 .

[0024] According to Figure 5The clamping ring (100) has a heptagonal cross-section (102). Its width and height are at least nearly identical. The cross-section (102) is bounded at the top by a flat clamping surface (105), at the bottom by a flat bearing surface (106), internally by a cylindrical inner surface (109), and externally by a frustoconical wedge surface (111) of the clamping ring; see also Figures 8 and 9 . The clamping ring wedge surface (111) has a cone angle of 12 degrees.

[0025] Between the inner surface (109) and the bearing surface (106) is a chamfered, frustoconical clamping surface (108) with a cone angle of 120 degrees. Between the upper clamping surface (105) and the inner surface (109) is a chamfered sliding wedge surface (107) with a cone angle of 90 degrees. In the outer region, the bearing surface (106) transitions into the clamping ring wedge surface (111) via the clamping ring return surface (112), which has a wedge angle of 105 degrees.

[0026] Neglecting the edge rounding, the clamping surface (108) has a chamfer length of, for example, 2.2 mm, the sliding wedge surface (107) of, for example, 2.8 mm, and the clamping ring return stroke surface (112) of, for example, 2.5 mm. Taking the edge rounding and chamfers into account, the effective width of the clamping ring wedge surface (111) is 2.9 mm.

[0027] As the Figures 8 and 9As shown, an elastomer body (121) is positively engaged between each pair of clamping elements (101). For this purpose, the individual clamping element (101) has, in the area of ​​its flat end face, cf. Figure 10 , a recess for rear gripping (115) into which a front-side clamping pin (122) of the adjacent elastomer body (121) engages.

[0028] The rear grip recess (115) is partially a bore (116). It has a diameter of 3 mm and is located, for example, 2.3 mm from the nearest end face of the clamping element (101). Its centerline is parallel to the centerline (9). The centerlines of the bores (116) are located 3 mm from the inner surface (109). An opening, for example, 2 mm wide, is provided between the bore (116) and the end face to form two rear grips (117). The respective clamping pin (122) of the elastomer body (121) has a geometric shape complementary to the rear grip recess (115). The diameter of each clamping pin (122) is slightly larger than that of the bore (116) to securely hold the six parts of the clamping ring (100) together after assembly.

[0029] Inside the clamping device (10) sits the annular piston (40), which can be displaced by, for example, 5.5 mm. The piston has an outer diameter of 70 mm and a piston width of 21.5 mm. The annular piston (40) has a central piston bore (51) with a minimum inner diameter of 33 mm. The front face (41) of the annular piston is chamfered in the outer area to match the base of the flange plate (13). The flat base (45) of the annular piston contains twelve spring guide bores (46), which are arranged opposite the blind bores (34) of the housing cover (31). The outer wall (47) of the annular piston (40) has two sealing ring grooves for receiving sealing rings.

[0030] The piston bore (51) is divided into three areas. The front upper area is the upper sealing zone (52), in which a sealing ring (54) is arranged in a sealing ring groove (53). The sealing ring (54) rests against the outer wall of the support tube (16). The rear lower area is the lower sealing zone (55), in which a sealing ring (57) is also located in a sealing ring groove (56). The lower sealing ring (57) contacts the outer wall of the stop tube (32) of the housing cover (31). All sealing rings are, for example, quad rings.

[0031] In the central area of ​​the piston bore (51), located between the two sealing zones (52, 55), there is an annular groove (61) consisting of a working section (62) and an immersion section (65). The working section (62) has a frustoconical annular groove wedge surface (63) against which the clamping ring (100) is radially supported when the combination bolt (130) is tightened. The annular groove wedge surface (63) has a cone angle of 12 degrees. It extends in the annular groove (61) over a length of, for example, 4 mm.

[0032] After Figure 4The immersion section (65) adjoins the upper end of the immersion section. The latter has a cylindrical groove base with a groove depth of, for example, 3.5 mm. The lower, frustoconical flank of the immersion section forms a return stroke surface (66) with a cone angle of 105 degrees. The immersion section (65) completely accommodates the clamping ring (100) when the end cap (70), moving into the end cap recess (33) of the housing cover (31), passes the clamping ring (100) – beneath its expansion. The transition between the annular groove wedge surface (63) and the return stroke surface (66) is rounded.

[0033] Naturally, the outer wall (47) of the ring piston (40) can have an oval, elliptical, polygonal, or polygonal contour. The same applies to the contour of the inner wall (48).

[0034] The closure cap (70) is an essentially rotationally symmetrical, piston-like component which closes the receiving recess (20) when the clamping device (10) is not in use, cf. Figures 1 to 4 It is also made of X90CrMoV18 stainless steel. Its end face is recessed by 0.3 mm, leaving a 0.9 mm wide rim. The end cap (70) has a cylindrical outer wall with a wave-like collar (71) in its lower section, which, in the closed position, rests against the rear grip shoulder (23) of the receiving recess (20). A stepped bore (72) penetrates the center of the cap, tapering in several stages towards the front end face.

[0035] After Figure 4The lower portion of the stepped bore (72) is a cylindrical section (73) with a diameter of 15 mm. The wall of the cylindrical section (73) contains an annular groove for a retaining ring and at least two overflow notches (74). Adjoining the cylindrical section (73) is an air distribution section (75), from which, for example, eight purge bores (76) extend to the radial outer wall of the closure cap (70). The purge bores (76) all lie in the same plane. They terminate tangentially in the air distribution section (75), with their center lines tangent to a circle centered on the center line (9), for example, with a diameter of 10.4 mm. This arrangement of the purge bores (76) creates a helically winding purge flow in the upwardly widening centering gap (22) during purge operation. The air distribution area (75) is followed by a guide bore (77) with a diameter of 6 mm.

[0036] Between the outer wall of the closure cap (70) and the stepped bore (72), a spring guide ring groove (81) is machined into the lower half of the closure cap (70). A closing spring (82), for example a helical compression spring with five coils, sits in this groove and is supported on the bottom of the closure cap recess (33) of the housing cover (31).

[0037] The lower end face of the closure cap (70) has a 1.4 x 45° chamfer according to DIN 406-11 as a spreading chamfer (78). The guide clearance of the closure cap (70) in the receiving recess (20) is less than 0.1 mm.

[0038] The stepped bore (72) is axially secured by a retaining ring, cf. Figure 11, a cleaning piston (85). Its piston, mounted in the cylinder area (73), is guided in the guide bore (77) by its piston rod (86), which is sealed. The piston rod (86) has a through bore (87) which is closed in the piston area, e.g., by means of a threaded pin. An axially discharged nozzle bore (89) is located in the free end face of the piston rod (86). For example, 1 mm below the free end face, there are, for example, eight further radially discharged nozzle bores (89), see also Figure 12 . In the air distribution area (75) the piston rod (86) has at least one radial bore (88) through which the through bores (87) are supplied with compressed air.

[0039] In the Figures 1 to 4The combination bolt (130), not yet inserted into the receiving recess (20), is shown above the clamping device (10). It is also made of the stainless steel X90CrMoV18 and, like the clamping elements (101), hardened to 56 + 3 HRC. The combination bolt (130) serves to clamp the workpiece to the clamping device (10) and simultaneously to precisely center it within the device. It is, for example, a 30 mm long turned part with a central through-hole (139) with an M10 thread. The through-hole (139) has a 3 mm deep countersink with a diameter of, for example, 10.5 mm on the workpiece side. At its opposite end, it has a 90° countersink.

[0040] At the workpiece-side end, the combination bolt (130) is equipped with a locating cylinder section (131) with a diameter of, for example, 18 mm and a height of, for example, 5 mm. It terminates in a flat axial contact surface (132). The part of the combination bolt (130) that, according to the Figure 6 and7 The clamping section (133), which is fully immersed in the receiving recess (20), essentially consists of three areas. The front area is the clamping area (133), and the rear area is the centering area (137). The waist area (136) lies between these two areas. The clamping area (133), which has a diameter of, for example, 26.8 mm in a cylindrical section 1.5 mm wide, serves, among other things, as a rear grip when clamping the workpiece, bearing against the clamping ring (100). For this purpose, it has a frustoconical inner clamping surface (134) with which, in the clamped state, it bears over a large area against the outer clamping surface (108) of the clamping ring (100). The effective flank length of the inner clamping surface (134), taking into account the rounding and radii, is at least 2.4 mm.

[0041] Between the cylindrical section and the front face of the clamping area (133) is a clamping ring return stroke chamfer (135) with a cone angle of 90 degrees. This facilitates the passage of the expanded clamping ring (100) when the combination bolt (130) is inserted into the receiving recess (20).

[0042] The centering area (137) of the combination bolt (130) has a finely machined outer clamping surface (138) facing the inner clamping surface (134), which is used for centering on the centering clamping surface (21) of the receiving recess (20) - according to the Figure 6 and 7 - has a large contact area. The effective flank length, taking into account the rounding and radii, is at least 5.4 mm. The maximum diameter of the outer clamping surface (138) measures, for example, 29.8 mm.

[0043] The waist area (136) has a diameter of, for example, 22 mm. Within this area are two opposing flattened areas, cf. Figure 1, in order to have two attack surfaces for an open-end wrench with a wrench size of 20.

[0044] After Figure 2 The clamping device (10) is in its unpressurized, unactuated initial state. The sealing cap (70) is in its closed position. Simultaneously, the annular piston (40) rests against the base of the cylinder (27) due to the action of the helical compression springs (69). The clamping ring (100) contacts the annular groove wedge surface (63) of the annular piston (40). The clamping ring (100) projects approximately halfway into the receiving recess (20). The sealing cap (70) rests with its expanding chamfer (78) at a distance of approximately 0.1 mm in front of the sliding wedge surface (107), thus preventing the sealing cap (70) from being opened by means of a positive locking mechanism. The cleaning piston (85) is located in its retracted position inside the sealing cap (70).

[0045] According to Figure 3The target pneumatic pressure is present at the rear piston base (45) of the annular piston (40). Simultaneously, compressed air enters the receiving recess (20) via the transverse bore (35). There, it acts on the cleaning piston (85) in the end cap (70), forcing it upwards in the stepped bore (72). The compressed air then flows through the overflow notches (74), across the air distribution area (75), into the purge bores (76), and through the through-bore (87) of the piston rod (86) into the extended nozzle bores (89) to purge the face of the end cap (70). The clamping ring (100) and the annular piston (40) seal the gap between the support tube (16) and the stop tube (32).

[0046] After Figure 4Compressed air is applied to the front face (41) of the annular piston, causing the annular piston (40) to seat itself on the housing cover (31) by compressing the helical compression springs (69). This brings the immersion section (65) to the level of the clamping ring (100). Simultaneously, the compressed air supply to the receiving recess (20) is interrupted. The cleaning piston (85), assisted by its closing spring (91), retracts into the sealing cap (70). The receiving recess (20) is now prepared for the insertion of the combination bolt (130).

[0047] According to Figure 5The combination bolt (130) is already largely immersed in the receiving recess (20) as the locking cap (70) is pushed forward against the force of the closing spring (82). The clamping area (133) of the combination bolt (130) presses the locking ring (100) into the immersion section (65) of the ring piston (40) by stretching the elastomer bodies (121) of the clamping ring (100). The clamping cap (70) was also stretched by the stretching of the elastomer bodies (121) shortly beforehand.

[0048] After Figure 6The combination bolt (130) has come into full contact with the centering clamping surface (21) of the flange plate (13) with its outer clamping surface (138). The axial contact surface (132) of the combination bolt (130) now lies in the plane in which the contact points of the upper surface of the flange plate (13) facing the workpiece are located. The clamping ring (100) has contracted to its initial position, whereby it has largely left the immersion section (65) of the ring piston (40) and its outer clamping surface (108) rests against the inner clamping surface (134) of the piston bolt (130). The end cap (70) is positioned a short distance, e.g. 0.1 mm, from the bottom of the end cap recess (33) of the housing cover (31).

[0049] According to Figure 7After the cylinder chamber located in front of the annular piston face (41) is vented, the annular piston (40) is pushed upwards by the action of the helical compression springs (69) – possibly with compressed air assistance – thereby moving the annular groove wedge surface (63) behind the clamping ring (100) to finally fix the combination bolt (130) in the clamping device (10) and press its clamping elements (101) against the inner clamping surface (134) of the clamping area (133) of the combination bolt (130). A tensile force acting on the combination bolt (130) is introduced into the clamping ring (100) via the clamping area (133) and from there transmitted via the flat clamping surface (105) into the end face of the stop tube (32) and thus into the housing (11).

[0050] If the clamping ring (100) has not yet fully engaged with the inner clamping surface (134) of the clamping area (133) of the combination bolt (130), see below. Figure 6, the parts (101, 121) still protruding into the immersion section (65) are pushed against the combination bolt (130) by means of the frustoconical return stroke surface (66) by contact with the clamping ring return stroke surface (112) of the clamping ring (100).

[0051] The measurement deviation from one clamping operation to the next is less than 5 µm. The clamping force is in the range of 18 kN.

[0052] Releasing the combination bolt (130) is essentially the reverse of the process. The annular piston (40) is pressed against the housing cover (31) with compressed air, causing the clamping ring (100) to be displaced into the immersion section (65) of the annular piston (40) when the piston bolt (130) is withdrawn. The frustoconical clamping surface (108) of the combination bolt (130) facilitates this process.

[0053] The Figure 13Figure 1 shows the rear of the clamping device (10). Compressed air can be introduced into the clamping device (10) in two different housing areas of this clamping system (1). The usual housing area is the underside of the housing cover (31), where, for example, four connections for compressed air hoses are provided. On the underside, in the area marked "1", there is a release compressed air connection (37). Through this connection, the compressed air is conveyed within the housing (11) to the front of the annular piston (41). In the area marked "3", there is a sealing air connection (39). Through this connection, the compressed air passes, for example, radially through the annular piston (40) into the immersion section (65), and from there along the clamping ring (100) between the support tube (16) and the stop tube (32) into the receiving recess (20).Next to the number "2" is a compressed air connection (36) through which compressed air can be supplied to the annular piston base (45) to assist the clamping movement of the annular piston (40). The blow-out connection (38) is only used if the clamping device (10) is not equipped with a sealing cap (70). In this case, compressed air is blown from the bottom of the sealing cap recess (33) towards the receiving recess (20) to expel any dirt particles located there.

[0054] For hoseless compressed air connection, five connections (17, 18, 19, 26, 25) are provided on the rear of the flange or flange plate (13). These connections are supplied from bores located in the support of the clamping device (10). The connections are the release compressed air connection (17), the blow-off connection (18), the sealing air connection (19), the clamping compressed air connection (26), and a support control connection (25), see [reference]. Figure 2 . Reference symbol list:

[0055] 1 clamping system 9 center line 10 Clamping device, assembly 11 Housing 12 Housing base, housing part 13 Flange plate, flange 14 Positioning slots 15 Fastening screws 16 Support tube 17 Release compressed air connection at (13) 18 Blow-off connection at (13) 19 Sealing air connection at (13) 20 Recess 21 Centering clamping surface, frustoconical 22 Centering gap 23 Rear grip shoulder 24 Channel system 25 Support control connection at (13) 26 Clamping compressed air connection at (13), optional 27 Cylinder 28 Venting groove 29 Axial ring groove 31 Housing cover, housing part 32 Stop tube 33 Recess for locking cap 34 Blind holes 35 Transverse hole 36 Clamping compressed air connection at (31), optional 37 Release compressed air connection at (31) 38 Blow-out connection at (31) 39 Sealing air connection at (31) 40 Ring piston 41 Ring piston front, top 42 Piston chamfer, chamfer 45 Ring piston base, piston base 46 Spring guide bores 47 Outer wall 48 Inner wall 51 Piston bore, central 52 Sealing zone, top, part of the piston seal 53 Sealing ring groove, top, part of the piston seal 54 Sealing ring, top, part of the piston seal 55 Sealing zone, bottom, part of the piston seal 56 Sealing ring groove, bottom, part of the piston seal 57 Sealing ring, bottom, part of the piston seal 61 Ring groove, working ring groove 62 Working section 63 Ring groove wedge surface, frustoconical, wedge gear part 65 Immersion section 66 Return stroke surface, frustoconical 69 Coil springs, return springs, spring elements 70 Closure cap 71 Wave collar 72 Stepped bore 73 Cylinder area 74 Overflow notches 75 Air distribution area 76 Blow-out holes 77 Guide bore 78 Expanding chamfer 81 Spring guide ring groove 82 Closing spring, helical compression spring 85 Cleaning piston 86 Piston rod 87 Through bore 88 Radial bore 89 Nozzle bore 91 Closing spring, helical compression spring 100 Clamping ring 101 Segmented clamping elements 102 Individual cross-section 105 Top clamping surface, flat 106 Bottom bearing surface, flat 107 Top sliding wedge surface, inside 108 Bottom enveloping clamping surface, inside 109 Cylindrical inner surface 111 Clamping ring wedge surface, wedge gear part 112 Clamping ring return stroke surface 115 Rear grip recess 116 Bore 117 Rear grips 121 Segmented elastomer spring elements 122 Clamping pin 130 Combination bolt, assembly 131 Fitting cylinder section 132 Axial contact surface, contact surface 133 Clamping area 134 Inner clamping surface, clamping surface 135 Clamping ring return stroke chamfer 136 Waist area 137 Centering area 138 Outer clamping surface, clamping surface 139 Through hole

Claims

1. A tensioning system consisting of a tensioning device (10) and a combination bolt (130), - wherein the tensioning device (10) mounts at least one annular piston (40) and at least three tensioning elements (101) in the housing (11), and also comprises an automatically closable receiving recess (20) for temporarily receiving the combination bolt (130), - wherein the combination bolt (130) has two tensioning faces (134, 138) in the shape of the conical surface of a truncatedcone, the surfaces of which are inclined towards one another, - wherein the housing (11) comprises a housing cover (31) lying on the housing main body (12), characterised in that the housing main body (12) of the housing (11) and the tensioning elements (101) each have a centring tensioning face or a shell tensioning face (21, 108) in the shape of the conical surface of a truncated cone, the surfaces of which face away from one another, - that a support tube (16) is integrally moulded on the housing main body (12) and a stop tube (32) is integrally moulded on the housing cover (31), - that the tensioning elements (101), as parts of a tensioning ring (100), are arranged radially advanceable in the axial direction between the end face of the support tube (16) and the end face of the stop tube (32) and - that the annular piston (40) comprises - for the displaceability of the tensioning elements (101) - an annular groove wedge face (63) in the shape of the conical surface of a truncated cone, which lies spatially between the upper (52-54) and lower piston inner seal (55-56).

2. The tensioning system according to claim 1, characterised in that the annular piston (40) sitting in a cylinder (27) of the tensioning device (10) comprises a cylindrical outer wall (47) in sections and a cylindrical inner wall (48) in sections.

3. The tensioning system according to claim 2, characterised in that the inner wall (48) of the annular piston (40) comprises between an upper and lower sealing zone (52, 55), each of which mounts a sealing ring (54, 57), an annular groove (61) consisting of at least two regions, the lower region whereof - viewed in the axial direction - has, as the groove base, the annular groove wedge face (63) in the shape of the conical surface of a truncated cone, whilst the upper region is an immersion section (65).

4. The tensioning system according to claim 1, characterised in that a spring element (121) is arranged in the tensioning device (10) between each two adjacent tensioning elements (101).

5. The tensioning system according to claim 4, characterised in that the tensioning elements (101) are coupled with the spring elements (121) in a form-fitting and captive manner for traction, compression and bending.

6. The tensioning system according to claim 5, characterised in that the spring elements (121) are elastomer bodies, the cross-section of each of which coincides with that of a tensioning element (101).

7. The tensioning system according to claim 1, characterised in that the annular piston (40) is part of a single-acting cylinder, for the clamping return movement of which the annular piston (40) is springloaded.

8. The tensioning system according to claims 1 and 2, characterised in that the housing main body (12), in the region of the main body upper side, comprises a flange (13) which projects radially beyond the cylinder (27) .

9. The tensioning system according to claim 8, characterised in that, for the separate feeding of unlocking compressed air, blow-out compressed air, tensioning compressed air and sealing air, the tensioning device (10) comprises corresponding connections (17, 18, 19, 26) and (36-39) both on the rear side of the flange (13) and also on the underside of the housing (11).