Automatic processing equipment for gas valve body

Abstract

The invention discloses gas valve body automatic machining equipment, and relates to the technical field of valve bodies, and the gas valve body automatic machining equipment comprises a rack used for supporting the device; the grinding mechanism is used for grinding the gas valve body and comprises a first supporting frame, and the first supporting frame is fixedly connected to the side of the upper surface of the rack; the angle adjusting device is used for adjusting the angle of the outer surface of the gas valve body, the angle adjusting device comprises a first circular plate, the first circular plate is fixedly connected to the axis of the upper surface of the rack, and a damper is fixedly connected to the side of the upper surface of the first circular plate; the rotating device is used for driving to generate a rotating effect, the rotating device comprises a servo motor, and the output end of the servo motor is fixedly connected with a rotating column; and the supporting device plays a supporting role, the supporting device comprises a fourth circular plate, the fourth circular plate is fixedly connected to the upper surface of the rotating device, and the effect that the outer surface of the valve body is evenly ground is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve bodies, and specifically to an automatic processing device for gas valve bodies. Background Art

[0002] A gas valve is used to cut off, connect, and regulate the gas in a pipeline, and has good control characteristics and closing and sealing performance. It is applicable to various gas medium pipelines such as city gas, liquefied petroleum gas, natural gas, and oxygen. The gas valve is widely used in various gas medium pipelines such as city gas supply network systems, liquefied petroleum gas, natural gas, and oxygen. The driving forms include manual, worm gear drive, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can achieve remote control and automated operation; In this regard, Chinese Patent Publication No.: CN105364563B relates to a general processing fixture for valve bodies, mainly including a workbench and positioning pins. Sliding grooves are distributed around the workbench, and pressing plates and hinge seats are slidably installed in the sliding grooves; a planar four-bar mechanism is connected between the pressing plates and the hinge seats; the lower end of the leftmost pressing plate is hinged with a long connecting rod, a control frame is provided at the left part of the long connecting rod, a circular groove is provided at the front end of the control frame, a screw is threadedly installed in the circular groove, a transfer wheel is rotatably installed in the circular groove, and the transfer wheel is hinged to the long connecting rod at any peripheral edge end; a ring groove is provided at the central position of the transfer wheel, a clamping groove is provided at the arc end of the transfer wheel, a ring insertion block is fixedly installed on the screw, a square groove is communicated with the front end of the circular groove, a pin is slidably installed in the square groove, and a support frame is connected to the central position of the control frame. The present invention can control the horizontal sliding distance of two pressing plates through the connection mode between the transfer wheel and the control frame, so as to achieve the effect of clamping valve bodies of different sizes and models, and has a wide application range.

[0003] In the comparative document, after clamping the gas valve body to fix it, the grinding operation is carried out. During the grinding process, it is necessary to manually adjust the angle of the grinding disc to achieve the grinding operation on the outer surface of the valve body. During the grinding process, the outer surface of the valve body will be unevenly ground due to the unstable adjustment of the angle of the grinding disc. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention is realized through the following technical solutions: an automatic processing device for gas valve bodies, including a frame for supporting the device; a grinding mechanism for grinding the gas valve body, the grinding mechanism including a first support frame fixedly connected to the side of the upper surface of the frame; an angle adjustment device for adjusting the angle of the outer surface of the gas valve body, the angle adjustment device including a first circular plate fixedly connected to the center of the upper surface of the frame, and a damper fixedly connected to the side of the upper surface of the first circular plate; A rotating device for driving to produce a rotating effect. The rotating device includes a servo motor, and a rotating column is fixedly connected to the output end of the servo motor; A supporting device for playing a supporting role. The supporting device includes a fourth circular plate, and the fourth circular plate is fixedly connected to the upper surface of the rotating device; A pre-fixing device for playing a pre-fixing effect on the gas valve body. The pre-fixing device includes a bottom plate.

[0005] Preferably, a fixing frame is fixedly connected to one end of the first support frame away from the frame. A first fixing block is fixedly connected to one side of the outer surface of the fixing frame away from the first support frame. A grinding piece is fixedly connected to one end of the first fixing block away from the fixing frame.

[0006] Preferably, a limiting frame is fixedly connected to the center of the upper surface of the first circular plate. A rotating ball is slidably connected to the inner cavity of the limiting frame, and the rotating ball is frictionally adapted to the inner wall of the limiting frame.

[0007] Preferably, a second fixing block is fixedly connected to the upper surface of the rotating ball. A second circular plate is fixedly connected to one end of the second fixing block away from the rotating ball. An extrusion plate is fixedly connected to the side surface of the second circular plate.

[0008] Preferably, the number of the extrusion plates is four, and the four extrusion plates are all fixedly connected to the outer surface of the second circular plate. The number of the dampers is four, and the four dampers are all fixedly connected to the side of the upper surface of the first circular plate. The extrusion plate is extrusionally adapted to the damper.

[0009] Preferably, the rotating device includes a second support frame. The second support frame is fixedly connected to the upper surface of the second circular plate. The servo motor is fixedly connected to the outer surface of the second support frame. A third support frame is fixedly connected to one side of the outer surface of the second support frame away from the servo motor. A spherical ball is fixedly connected to the end of the third support frame. A third circular plate is fixedly connected to the top end of the rotating column. A limiting slide rail is fixedly connected to the side of the lower surface of the third circular plate. The spherical ball is frictionally adapted to the lower surface of the limiting slide rail.

[0010] Preferably, the number of the supporting devices is five, and the five supporting devices are all fixedly connected to the side of the upper surface of the third circular plate. A limiting tube is fixedly connected to the upper surface of the fourth circular plate. A first spring is fixedly connected to the center of the upper surface of the fourth circular plate. One end of the first spring is fixedly connected to a movable block. A movable column is fixedly connected to the upper surface of the movable block. A fixing ring is fixedly connected to the outer surface of the movable column. A clamping device is fixedly connected to the outer surface of the movable column away from the movable block.

[0011] Preferably, the clamping device includes a fourth support frame fixedly connected to the outer surface of the movable column. A third fixing block is fixedly connected to the end of the fourth support frame. A first fixing rod is fixedly connected to the lower surface of the third fixing block. An elastic frame is fixedly connected to one end of the third fixing block away from the fourth support frame. An extrusion soft plate is fixedly connected to one end of the elastic frame away from the third fixing block. A second fixing rod is fixedly connected to the lower surface of the extrusion soft plate. A second spring is fixedly connected between the opposite surfaces of the first fixing rod and the second fixing rod.

[0012] Preferably, the bottom plate is fixedly connected to the center of the upper surface of the third circular plate. A cylinder is fixedly connected to the upper surface of the bottom plate. A top plate is fixedly connected to the top end of the cylinder. A shrapnel is fixedly connected to the upper surface of the bottom plate.

[0013] Preferably, limiting rods are fixedly connected to the upper surface of the bottom plate and the lower surface of the top plate. An elastic ring is movably connected to the outer surface of the limiting rod. The elastic ring is in extrusion fit with the limiting rod. A support block is fixedly connected to one end of the elastic ring away from the cylinder. The support block is in extrusion fit with the shrapnel.

[0014] The present invention provides an automatic processing device for a gas valve body, having the following beneficial effects: First, in this automatic processing device for a gas valve body, by setting an angle adjustment device, the inclination angle of the gas valve body can be changed, so that the outer surface of the gas valve body can be polished comprehensively during polishing. When the gas valve body needs to be polished, the operator only needs to press the extrusion plate. Under the action of the rotating ball and the limiting frame, the second circular plate starts to tilt. The setting of the four dampers can stabilize the second circular plate.

[0015] Second, in this automatic processing device for a gas valve body, by setting a rotating device, a rotating effect can be generated, so that the gas valve body rotates and cooperates with the grinding disc, achieving the grinding effect on the gas valve body. During use, the operator connects the servo motor to the power supply and turns on the switch of the servo motor. The servo motor drives the rotating column to rotate. During the rotation process, the rotating column drives the third circular plate to rotate, so that the supporting device rotates. The setting of the limiting slide rail can cooperate with the spherical ball, supporting the third circular plate while reducing the friction generated by rotation.

[0016] Third, in this automatic processing device for a gas valve body, by setting a supporting device, the gas valve body can be supported and clamped. While supporting the gas valve body, it can clamp and fix the gas valve body to prevent the gas valve body from shifting during rotational grinding. The setting of the limiting tube, the movable block and the first spring can make the clamping device tightly contact the lower surface of the gas valve body, thereby increasing the clamping effect of the clamping device on the gas valve body.

[0017] IV. This automatic processing equipment for gas valve bodies can clamp the groove on the lower surface of the gas valve body through the clamping device, thus achieving the fixation effect of the gas valve body. When the first spring presses upward, the clamping device contacts the lower surface of the gas valve body. During the contact process, the extrusion soft plate will tightly contact the groove wall on the lower surface of the gas valve body. The setting of the second spring and the elastic frame can make the extrusion soft plate contact the groove wall more closely.

[0018] V. This automatic processing equipment for gas valve bodies can pre - fix the gas valve body through the pre - fixing device, so that the supporting device can better support and clamp the gas valve body. During use, the operator sleevs the circular hole at the axis of the gas valve body on the outer surface of the top plate, and then places the gas valve body down, so that the lower surface of the gas valve body contacts and presses against the supporting block. The elastic ring is sleeved on the outer surface of the limiting rod, which can pull and limit the supporting block. Under the action of the elastic ring, the supporting block plays a supporting role for the gas valve body. The setting of the elastic sheet can prevent the supporting block from directly pressing against the bottom plate. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the external structure of an automatic processing equipment for a gas valve body of the present invention; Figure 2 It is a schematic diagram of the disassembled structure of the present invention; Figure 3 It is a schematic diagram of the detailed structure of the present invention; Figure 4 It is a schematic diagram of the angle - adjusting device structure of the present invention; Figure 5 It is a schematic diagram of the rotating device structure of the present invention; Figure 6 It is a schematic diagram of the cross - sectional structure of the supporting device of the present invention; Figure 7 It is a schematic diagram of the clamping device structure of the present invention; Figure 8 It is a schematic diagram of the pre - fixing device structure of the present invention.

[0020] In the figure: 1, frame; 2, first support frame; 3, fixed frame; 4, first fixing block; 5, grinding disc; 6, angle adjustment device; 7, rotating device; 8, supporting device; 9, pre-fixing device; 61, first circular plate; 62, limiting frame; 63, rotating ball; 64, second fixing block; 65, second circular plate; 66, pressing plate; 67, damping; 71, second support frame; 72, servo motor; 73, rotating column; 74, third circular plate; 75, third support frame; 76, spherical ball; 77, limiting slide rail; 81, fourth circular plate; 82, first spring; 83, limiting tube; 84, movable block; 85, movable column; 86, fixing ring; 87, clamping device; 871, fourth support frame; 872, third fixing block; 873, first fixing rod; 874, second spring; 875, elastic frame; 876, pressing soft plate; 877, second fixing rod; 91, bottom plate; 92, cylinder; 93, top plate; 94, elastic sheet; 95, limiting rod; 96, elastic ring; 97, supporting block. Detailed implementation mode

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and the detailed implementation mode. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0022] The first embodiment is as Figure 1 - Figure 4 shown. The present invention provides a technical solution: an automatic processing device for a gas valve body, including a frame 1 for supporting the device; a grinding mechanism for grinding the gas valve body. The grinding mechanism includes a first support frame 2, and the first support frame 2 is fixedly connected to the side of the upper surface of the frame 1; an angle adjustment device 6 for adjusting the angle of the outer surface of the gas valve body. The angle adjustment device 6 includes a first circular plate 61, the first circular plate 61 is fixedly connected to the center of the upper surface of the frame 1, and a damping 67 is fixedly connected to the side of the upper surface of the first circular plate 61; a rotating device 7 for driving a rotating effect. The rotating device 7 includes a servo motor 72, and the output end of the servo motor 72 is fixedly connected to a rotating column 73; a supporting device 8 for playing a supporting role. The supporting device 8 includes a fourth circular plate 81, and the fourth circular plate 81 is fixedly connected to the upper surface of the rotating device 7; The pre-fixing device 9 has a pre-fixing effect on the gas valve body. The pre-fixing device 9 includes a bottom plate 91. One end of the first support frame 2 far from the machine frame 1 is fixedly connected with a fixing frame 3. One side of the outer surface of the fixing frame 3 far from the first support frame 2 is fixedly connected with a first fixing block 4. One end of the first fixing block 4 far from the fixing frame 3 is fixedly connected with a grinding sheet 5. The center of the upper surface of the first circular plate 61 is fixedly connected with a limiting frame 62. A rotating ball 63 is slidably connected in the inner cavity of the limiting frame 62. The rotating ball 63 is frictionally adapted to the inner wall of the limiting frame 62. The upper surface of the rotating ball 63 is fixedly connected with a second fixing block 64. One end of the second fixing block 64 far from the rotating ball 63 is fixedly connected with a second circular plate 65. The side surface of the second circular plate 65 is fixedly connected with a pressing plate 66. The number of the pressing plates 66 is four, and the four pressing plates 66 are all fixedly connected to the outer surface of the second circular plate 65. The number of the dampers 67 is four, and the four dampers 67 are all fixedly connected to the side of the upper surface of the first circular plate 61. The pressing plate 66 is in pressing fit with the damper 67.

[0023] During use, by setting the grinding sheet 5, it can cooperate with the rotating device 7, the supporting device 8 and the pre-fixing device 9, so as to produce the effect that the gas valve body rotates while the grinding sheet 5 does not rotate, thereby improving the grinding efficiency. By setting the angle adjustment device 6, the inclination angle of the gas valve body can be changed, so that the outer surface of the gas valve body can be ground comprehensively during grinding. When it is necessary to grind the gas valve body, the operator only needs to press the pressing plate 66. Under the action of the rotating ball 63 and the limiting frame 62, the second circular plate 65 starts to tilt. The setting of the four dampers 67 can play a stabilizing effect on the second circular plate 65.

[0024] The second embodiment is as Figure 5 shown. The rotating device 7 includes a second support frame 71. The second support frame 71 is fixedly connected to the upper surface of the second circular plate 65. A servo motor 72 is fixedly connected to the outer surface of the second support frame 71. One side of the outer surface of the second support frame 71 far from the servo motor 72 is fixedly connected with a third support frame 75. The end of the third support frame 75 is fixedly connected with a spherical ball 76. The top of the rotating column 73 is fixedly connected with a third circular plate 74. The side of the lower surface of the third circular plate 74 is fixedly connected with a limiting slide rail 77. The spherical ball 76 is frictionally adapted to the lower surface of the limiting slide rail 77.

[0025] During use, by setting the rotating device 7, a rotating effect can be generated, so that the gas valve body rotates and cooperates with the grinding disc 5, achieving the grinding effect on the gas valve body. During use, the operator connects the servo motor 72 to the power supply and turns on the switch of the servo motor 72. The servo motor 72 drives the rotating column 73 to rotate. During the rotation process, the rotating column 73 drives the third circular plate 74 to rotate, thereby causing the supporting device 8 to rotate. The setting of the limiting slide rail 77 can cooperate with the spherical ball 76 to support the third circular plate 74 while reducing the frictional force generated by the rotation.

[0026] The third embodiment is as Figure 6 - Figure 8 shown. The number of the supporting devices 8 is five, and the five supporting devices 8 are all fixedly connected to the side of the upper surface of the third circular plate 74. A limiting tube 83 is fixedly connected to the upper surface of the fourth circular plate 81. A first spring 82 is fixedly connected to the center of the upper surface of the fourth circular plate 81. The end of the first spring 82 is fixedly connected to a movable block 84. A movable column 85 is fixedly connected to the upper surface of the movable block 84. A fixed ring 86 is fixedly connected to the outer surface of the movable column 85. A clamping device 87 is fixedly connected to the outer surface of the movable column 85 at a position far from the movable block 84. The clamping device 87 includes a fourth support frame 871 fixedly connected to the outer surface of the movable column 85. A third fixing block 872 is fixedly connected to the end of the fourth support frame 871. A first fixing rod 873 is fixedly connected to the lower surface of the third fixing block 872. An elastic frame 875 is fixedly connected to one end of the third fixing block 872 far from the fourth support frame 871. An extrusion soft plate 876 is fixedly connected to one end of the elastic frame 875 far from the third fixing block 872. A second fixing rod 877 is fixedly connected to the lower surface of the extrusion soft plate 876. A second spring 874 is fixedly connected between the opposite surfaces of the first fixing rod 873 and the second fixing rod 877. A bottom plate 91 is fixedly connected to the center of the upper surface of the third circular plate 74. A cylinder 92 is fixedly connected to the upper surface of the bottom plate 91. A top plate 93 is fixedly connected to the top of the cylinder 92. A spring plate 94 is fixedly connected to the upper surface of the bottom plate 91. A limiting rod 95 is fixedly connected between the upper surface of the bottom plate 91 and the lower surface of the top plate 93. An elastic ring 96 is movably connected to the outer surface of the limiting rod 95. The elastic ring 96 is adapted to be extruded with the limiting rod 95. A support block 97 is fixedly connected to one end of the elastic ring 96 far from the cylinder 92. The support block 97 is adapted to be extruded with the spring plate 94.

[0027] During use, by setting the support device 8, the gas valve body can be supported and clamped. While supporting the gas valve body, it can be clamped and fixed to prevent the gas valve body from shifting during rotation and grinding. The settings of the limit tube 83, the movable block 84, and the first spring 82 can make the clamping device 87 closely contact the lower surface of the gas valve body, thereby increasing the clamping effect of the clamping device 87 on the gas valve body. By setting the clamping device 87, it can clamp the groove on the lower surface of the gas valve body, thereby completing the fixing effect on the gas valve body. When the first spring 82 is squeezed upward, the clamping device 87 contacts the lower surface of the gas valve body. During the contact process, the extrusion soft plate 876 will closely contact the groove wall on the lower surface of the gas valve body. The settings of the second spring 874 and the elastic frame 875 can make the extrusion soft plate 876 contact the groove wall more closely. By setting the pre-fixing device 9, the gas valve body can be pre-fixed, so that the support device 8 can better support and clamp the gas valve body. During use, the operator sleeved the circular hole at the axis of the gas valve body on the outer surface of the top plate 93, and then placed the gas valve body down, so that the lower surface of the gas valve body is squeezed and contacted with the support block 97. The elastic ring 96 is sleeved on the outer surface of the limit rod 95, which can pull and limit the support block 97. Under the action of the elastic ring 96, the support block 97 plays a supporting role for the gas valve body. The setting of the elastic piece 94 can prevent the support block 97 from directly squeezing the bottom plate 91.

[0028] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. An automatic processing equipment for a gas valve body, characterized in that, Including: A frame (1) for supporting the device; A grinding mechanism for grinding the gas valve body. The grinding mechanism includes a first support frame (2), and the first support frame (2) is fixedly connected to the side of the upper surface of the frame (1); An angle adjustment device (6) for adjusting the angle of the outer surface of the gas valve body. The angle adjustment device (6) includes a first circular plate (61), and the first circular plate (61) is fixedly connected to the center of the upper surface of the frame (1). A damper (67) is fixedly connected to the side of the upper surface of the first circular plate (61); A rotating device (7) for driving a rotating effect. The rotating device (7) includes a servo motor (72), and the output end of the servo motor (72) is fixedly connected to a rotating column (73); A support device (8) for providing support. The support device (8) includes a fourth circular plate (81), and the fourth circular plate (81) is fixedly connected to the upper surface of the rotating device (7); A pre-fixing device (9) for pre-fixing the gas valve body. The pre-fixing device (9) includes a bottom plate (91).

2. The automatic processing equipment for the gas valve body according to claim 1, wherein: One end of the first support frame (2) away from the frame (1) is fixedly connected to a fixing frame (3). One side of the outer surface of the fixing frame (3) away from the first support frame (2) is fixedly connected to a first fixing block (4). One end of the first fixing block (4) away from the fixing frame (3) is fixedly connected to a grinding disc (5).

3. The automatic processing equipment for the gas valve body according to claim 1, wherein: A limiting frame (62) is fixedly connected to the center of the upper surface of the first circular plate (61). A rotating ball (63) is slidably connected to the inner cavity of the limiting frame (62), and the rotating ball (63) is frictionally adapted to the inner wall of the limiting frame (62).

4. The automatic processing equipment for gas valve bodies according to claim 3, characterized in that: A second fixing block (64) is fixedly connected to the upper surface of the rotating ball (63). One end of the second fixing block (64) away from the rotating ball (63) is fixedly connected to a second circular plate (65). An extrusion plate (66) is fixedly connected to the side surface of the second circular plate (65).

5. The automatic processing equipment for the gas valve body according to claim 4, characterized in that: The number of the extrusion plates (66) is four, and the four extrusion plates (66) are all fixedly connected to the outer surface of the second circular plate (65). The number of the dampers (67) is four, and the four dampers (67) are all fixedly connected to the side of the upper surface of the first circular plate (61). The extrusion plate (66) is extrusionally adapted to the damper (67).

6. The automatic processing equipment for the gas valve body according to claim 4, characterized in that: The rotating device (7) includes a second support frame (71). The second support frame (71) is fixedly connected to the upper surface of the second circular plate (65). The servo motor (72) is fixedly connected to the outer surface of the second support frame (71). A third support frame (75) is fixedly connected to one side of the outer surface of the second support frame (71) away from the servo motor (72). A spherical ball (76) is fixedly connected to the end of the third support frame (75). A third circular plate (74) is fixedly connected to the top end of the rotating column (73). A limiting slide rail (77) is fixedly connected to the side of the lower surface of the third circular plate (74). The spherical ball (76) is frictionally adapted to the lower surface of the limiting slide rail (77).

7. The automatic processing equipment for gas valve bodies according to claim 6, characterized in that: The number of the supporting devices (8) is five, and the five supporting devices (8) are all fixedly connected to the side of the upper surface of the third circular plate (74). A limiting tube (83) is fixedly connected to the upper surface of the fourth circular plate (81). A first spring (82) is fixedly connected to the center of the upper surface of the fourth circular plate (81). The end of the first spring (82) is fixedly connected to a movable block (84). A movable column (85) is fixedly connected to the upper surface of the movable block (84). A fixing ring (86) is fixedly connected to the outer surface of the movable column (85). A clamping device (87) is fixedly connected to the outer surface of the end of the movable column (85) away from the movable block (84).

8. The automatic processing equipment for a gas valve body according to claim 7, characterized in that: The clamping device (87) includes a fourth support frame (871). The fourth support frame (871) is fixedly connected to the outer surface of the movable column (85). A third fixing block (872) is fixedly connected to the end of the fourth support frame (871). A first fixing rod (873) is fixedly connected to the lower surface of the third fixing block (872). An elastic frame (875) is fixedly connected to the end of the third fixing block (872) away from the fourth support frame (871). An extrusion soft plate (876) is fixedly connected to the end of the elastic frame (875) away from the third fixing block (872). A second fixing rod (877) is fixedly connected to the lower surface of the extrusion soft plate (876). A second spring (874) is fixedly connected between the opposite surfaces of the first fixing rod (873) and the second fixing rod (877).

9. The automatic processing equipment for a gas valve body according to claim 6, wherein: The bottom plate (91) is fixedly connected to the center of the upper surface of the third circular plate (74). A cylinder (92) is fixedly connected to the upper surface of the bottom plate (91). A top plate (93) is fixedly connected to the top of the cylinder (92). A elastic sheet (94) is fixedly connected to the upper surface of the bottom plate (91).

10. The automatic processing equipment for the gas valve body according to claim 9, wherein: Limit rods (95) are fixedly connected to the upper surface of the bottom plate (91) and the lower surface of the top plate (93). An elastic ring (96) is movably connected to the outer surface of the limit rods (95). The elastic ring (96) is adapted to be extruded with the limit rods (95). A support block (97) is fixedly connected to the end of the elastic ring (96) away from the cylinder (92). The support block (97) is adapted to be extruded with the elastic sheet (94).

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