CN108213231B

CN108213231B - Inflatable flanging machine

Info

Publication number: CN108213231B
Application number: CN201810011265.XA
Authority: CN
Inventors: 张宇
Original assignee: SHENZHEN NEW CANGHAI MACHINERY CO Ltd
Current assignee: SHENZHEN NEW CANGHAI MACHINERY CO Ltd
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2024-04-26
Anticipated expiration: 2038-01-05
Also published as: US20200360982A1; CN108213231A; JP2020506055A; WO2019134282A1

Abstract

The invention discloses an inflatable flanging machine, which comprises a spinning flanging device for flanging a workpiece, wherein the spinning flanging device comprises a spinning mechanism, the spinning mechanism comprises a spinning wheel provided with an inclined plane position and a spinning position, the inclined plane position is used for pressing down the inclined plane corresponding to the inclined plane position of the workpiece to plate out the inclined plane, the spinning position is used for carrying out straight plane flattening on the workpiece with the inclined plane pulled out, and the spinning wheel can be controlled by the external force applied to the spinning mechanism to generate axial displacement, so that the working face opposite to the workpiece is switched between the inclined plane position and the spinning position. Therefore, the rotating wheel can generate axial displacement, so that the working face opposite to the workpiece can be switched between the inclined plane position and the rotation flat position, the workpiece is pulled out of the inclined plane first, then the inclined plane is flattened, and the workpiece can be turned over by needing smaller pressure compared with the traditional flanging machine.

Description

Inflatable flanging machine

Technical Field

The invention relates to the field of shock absorber processing, in particular to an inflatable flanging machine.

Background

At present, the inflation and flanging of the shock absorber are respectively finished on different machines, flanging is firstly carried out and then the shock absorber is inflated, the production efficiency is low, and an inserting sheet is required to be inserted from a sealing ring of the shock absorber to be processed during inflation, so that the sealing ring is easy to damage during operation, the sealing performance of the shock absorber assembly is affected, and in addition, the existing flanging machine needs to load larger pressure for flanging a workpiece.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention needs to provide an inflatable flanger.

The invention provides an inflatable flanging machine, which comprises a spinning flanging device for flanging a workpiece, wherein the spinning flanging device comprises a spinning mechanism, the spinning mechanism comprises a spinning wheel provided with an inclined plane position and a spinning flat position, the inclined plane position is used for being pressed down to pull out the inclined plane corresponding to the inclined plane position of the workpiece, the spinning flat position is used for carrying out straight plane flattening on the workpiece with the inclined plane pulled out, and the spinning wheel can be controlled by the external force applied to the spinning mechanism to generate axial displacement, so that a working surface opposite to the workpiece is switched between the inclined plane position and the spinning flat position.

Preferably, the spinning mechanism further comprises a first bearing, a second bearing and a pressure spring, the spinning roller comprises a spinning part and a spinning shaft connected with the spinning part, the spinning part comprises a first end, a second end opposite to the first end and a spinning surface connected with the first end and the second end, the spinning surface is used for spinning the workpiece, the spinning surface is formed with a linear spinning section and an arc spinning section connected with the linear spinning section, the linear spinning section is formed with a spinning position, the arc spinning section is formed with an inclined plane position, the front end of the spinning shaft is connected with the second end, the first bearing, the second bearing and the pressure spring are sleeved on the spinning shaft, the pressure spring is clamped between the first bearing and the second bearing, and the spinning roller can move along the axial direction of the spinning shaft.

Preferably, an adjusting pad is sandwiched between the first end and the first bearing.

Preferably, a lock nut is fixed at the rear end of the spinning shaft.

Preferably, the spinning flanging device comprises a sealing wheel mounting disc and a guide mechanism, wherein the guide mechanism and the spinning mechanism are mounted in the sealing wheel mounting disc, and the guide mechanism is used for righting the workpiece so that the workpiece and the spinning flanging device are coaxially arranged.

Preferably, the first bearing, the second bearing and the pressure spring are located between the rear end of the spinning shaft and the second end, a spinning shaft end cover is fixed on the outer side surface of the sealing wheel mounting disc, and the locking nut and the rear end of the spinning shaft are exposed out through the spinning shaft end cover.

Preferably, the sealing wheel mounting plate is cylindrical, the number of the spinning mechanisms is three, and the three spinning mechanisms are uniformly distributed along the circumferential direction of the sealing wheel mounting plate.

Preferably, the spinning shaft is arranged along the radial direction of the sealing wheel mounting disc, and the first end of the spinning part faces to the circle center of the sealing wheel mounting disc.

Preferably, the number of the guide mechanisms is three, the three guide mechanisms are uniformly distributed along the circumferential direction of the sealing wheel mounting disc, and the spinning mechanisms and the guide mechanisms are distributed at intervals.

Preferably, each guide mechanism comprises a guide shaft, a guide wheel and a guide bearing, wherein the guide shaft is fixed in the sealing wheel mounting disc, the guide wheel is mounted on the guide shaft, and the guide bearing is clamped between the guide wheel and the guide shaft.

According to the inflatable flanging machine disclosed by the embodiment of the invention, as the rotating wheel can generate axial displacement, the working surface opposite to the workpiece can be switched between the inclined surface position and the rotation flat position, so that the workpiece is firstly pulled out of the inclined surface and then the inclined surface is flattened, and the workpiece can be flanged by needing smaller pressure compared with the traditional flanging machine.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a schematic perspective view of an inflatable flanger of an embodiment of the present invention.

Fig. 2 is another schematic perspective view of an inflatable flanger of an embodiment of the present invention.

Fig. 3 is a further schematic perspective view of an inflatable flanger of an embodiment of the present invention.

Fig. 4 is a schematic view of the structure of the work piece.

Fig. 5 is an enlarged schematic view of the v portion of the workpiece of fig. 4.

Fig. 6 is a schematic structural view of a fixing device of an air-inflation flanger according to an embodiment of the present invention.

Fig. 7 is a perspective view of a spinning flanging device of an inflatable flanging machine according to an embodiment of the present invention.

Fig. 8 is a schematic view showing a state of pre-flanging of the spinning flanging device of the gas-filled flanging machine in the embodiment of the present invention.

Fig. 9 is a schematic view showing a state of flanging molding of the spinning flanging device of the inflation flanging machine in the embodiment of the present invention.

Fig. 10 is a cross-sectional view of a spin-flanging device of an inflatable flanging machine in accordance with an embodiment of the present invention.

Fig. 11 is an enlarged schematic view of the XI portion of the spinning flanging device in fig. 9.

Fig. 12 is a schematic structural view of an inflator and a rotary seal device of an inflation flanger according to an embodiment of the present invention.

Fig. 13 is a plan view of an inflator and a rotary seal device of an inflation flanger according to an embodiment of the present invention.

Fig. 14 is a cross-sectional view of the inflator of fig. 13 taken along the line XIV-XIV.

Fig. 15 is a partial cross-sectional view of an inflatable flanger in accordance with an embodiment of the present invention in relation to a rotary sealing device.

Fig. 16 is an enlarged schematic view of the xvi portion of fig. 15.

Fig. 17 is a schematic perspective view of a twin wire rod pressure feed apparatus of an inflatable flanger of an embodiment of the present invention.

Fig. 18 is a top view of a dual wire rod pressure feed apparatus of an inflatable flanger of an embodiment of the present invention.

Fig. 19 is a schematic structural view of a double wire rod pressure feed device of an air-inflation flanger of an embodiment of the present invention.

Fig. 20 is a schematic perspective view of a screw assembly of an inflatable flanger of an embodiment of the present invention.

Fig. 21 is a cross-sectional view of a screw assembly of an inflatable flanger of an embodiment of the present invention.

Fig. 22 is another cross-sectional view of a screw assembly of an inflatable flanger of an embodiment of the present invention.

Fig. 23 is a perspective view of a drawbar mechanism of an inflatable flanger of an embodiment of the invention.

Fig. 24 is a schematic structural view of a stem pulling mechanism of an air-inflation flanger according to an embodiment of the present invention.

Fig. 25 is a schematic view showing a state of a rod pulling mechanism of an air-filled flanger according to an embodiment of the present invention.

FIG. 26 is an enlarged schematic view of the XXVI portion of FIG. 25.

FIG. 27 is an enlarged schematic view of the XXVII portion of FIG. 25.

Fig. 28 is a schematic view showing a state of a pneumatic flanger piston rod according to an embodiment of the present invention.

Fig. 29 is a schematic view showing an uncontacted state of the pneumatic flanger with respect to the anti-refutation force measuring mechanism according to the embodiment of the present invention.

FIG. 30 is a schematic view showing a contact state of the pneumatic flanger with respect to the anti-refutation force measuring mechanism according to the embodiment of the present invention.

Fig. 31 is a perspective view of a spinning and flanging device of an inflatable flanging machine in accordance with another embodiment of the present invention.

FIG. 32 is a partial cross-sectional view of a spin-flanging device of an inflatable flanger in accordance with another embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 8 to 11, an inflatable flanging machine 10 according to an embodiment of the present invention includes a spinning flanging device 12 for flanging a workpiece 20, the spinning flanging device 12 includes a spinning mechanism 123, the spinning mechanism 123 includes a spinning wheel 123a formed with a bevel position and a spin level position, the bevel position is used for pulling out a bevel corresponding to a tilting position of the workpiece 20, the spin level position is used for carrying out straight face flattening on the workpiece 20 pulling out the bevel, the spinning wheel 123a can be controlled by an external force applied to the spinning mechanism 123 to generate axial displacement, so that a working face facing the workpiece 20 is switched between the bevel position and the spin level position.

According to the inflatable flanging machine 10 disclosed by the embodiment of the invention, as the spinning roller 123a can generate axial displacement, the working surface opposite to the workpiece 20 can be switched between the inclined surface position and the spinning position, so that the workpiece 20 is firstly inclined and then the inclined surface is flattened, and the workpiece 20 can be flanged by needing smaller pressure compared with the traditional flanging machine.

The spinning mechanism 123 further includes a first bearing 123b, a second bearing 123c and a pressure spring 123d, the spinning roller 123a includes a spinning portion 123h and a spinning shaft 123i connected to the spinning portion 123h, the spinning portion 123h includes a first end 123j, a second end 123k opposite to the first end 123j, and a spinning surface 123l connecting the first end 123j and the second end 123k, the spinning surface 123l is used for spinning the workpiece 20, the spinning surface 123l is formed with a linear spinning section 123m and a circular arc spinning section 123n connected to the linear section 123m, the linear spinning section 123m is formed with a spinning position, the circular arc spinning section 123n is formed with an inclined plane position, the front end of the spinning shaft 123i is connected to the second end 123k, the spinning shaft 123i is sleeved with the first bearing 123b, the second bearing 123c and the pressure spring 123d, the pressure spring 123d is sandwiched between the first bearing 123b and the second bearing 123c, and the roller 123a can move along the axial direction of the spinning shaft 123 i.

In this way, since the spinning roller 123a can move along the axial direction of the spinning shaft 123i, the spinning points of the spinning surface 123l and the workpiece 20 can be changed from the circular arc spinning section 123n to the linear spinning end, so that the workpiece 20 is turned into a slope and then turned into a plane, and the workpiece 20 can be turned over with a smaller pressure than that of the conventional flanging machine.

Referring to fig. 1 to 5, an inflatable flanger 10 according to an embodiment of the present invention inflates a workpiece 20 and then flares the workpiece 20 to manufacture a shock absorber. The workpiece 20 comprises a cylindrical oil storage cylinder 21, a piston rod 22, a guide 23 and an oil seal 24, wherein the oil storage cylinder 21 comprises a bottom end and a top end opposite to the bottom end, the bottom end is a closed end, the piston rod 22 extends into the oil storage cylinder 21 from the top end of the oil storage cylinder 21 and is partially exposed out of the oil storage cylinder 21, the guide 23 is arranged at the top end of the oil storage cylinder 21 in a sleeved mode, the guide 23 is arranged on the piston rod 22 in a sleeved mode, the guide 23 is clamped between the oil storage cylinder 21 and the piston rod 22, the top end of the oil storage cylinder 21 is provided with the oil seal 24, the oil seal 24 is used for sealing the top end of the oil storage cylinder 21, the oil seal 24 is sleeved on the piston rod 22 and is abutted to the guide 23, and after the workpiece 20 is turned over by the inflation flanging machine 10, the top end of the oil storage cylinder 21 is folded to compress the oil seal 24.

The inflation flanger 10 comprises a fixing device 11, a spinning flanging device 12, an inflation device 13, a rotary sealing device 14 and a double-wire-rod pressure feeding device 15. The fixing device 11 is used for fixing the workpiece 20, the inflating device 13 is used for inflating the workpiece 20, the spinning flanging device 12 is used for flanging the workpiece 20, and the rotary sealing device 14 is used for ensuring tightness when the workpiece 20 is inflated and flanging. The double wire rod pressure feeding device 15 is used for controlling the lifting of the spinning flanging device 12.

Referring to fig. 6 in combination, in the present embodiment, the fixing device 11 includes a base 111, a mounting frame 112, a positioning block 113, a swinging rod 114, a pressing rod 115, an air cylinder 116, and a connecting rod 117. The base 111 is used for installing the workpiece 20, the base 111 comprises a bottom plate 111a and a cylindrical fixing position 111b arranged on the bottom plate 111a, and the fixing position 111b is used for installing the workpiece 20. The mounting frame 112 is fixed on the bottom plate 111a, the positioning block 113 is fixed on the mounting frame 112, the positioning block 113 is semi-annular, and the positioning block 113 is positioned above the fixing position 111 b. The cylinder 116 is used for driving the connecting rod 117, the cylinder 116 is fixed on the mounting frame 112, the cylinder 116 is connected with the connecting rod 117, the swinging rod 114 is rotatably arranged on the mounting frame 112, the swinging rod 114 is L-shaped, the swinging rod 114 comprises a first swinging rod 114a and a second swinging rod 114b connected with the first swinging rod 114a, one end of the first swinging rod 114a is connected with the connecting rod 117, the second swinging rod 114b is connected with the pressing rod 115, and the pressing rod 115 is used for pressing the workpiece 20 on the positioning block 113. Specifically, the second swing link 114b is formed with a mounting groove 114c, the pressing rod 115 includes a cylindrical abutting portion 115a and a cylindrical portion 115b connected to the abutting portion 115a, the abutting portion 115a is coaxially disposed with the cylindrical portion 115b, the diameter of the abutting portion 115a is larger than the diameter of the cylindrical portion 115b, the cylindrical portion 115b is inserted into the mounting groove 114c, the fixing nut 11a is mounted on the cylindrical portion 115b, and the second swing link 114b is located between the abutting portion 115a and the fixing nut 11 a. When the inflation flanging machine 10 works, the bottom end of the workpiece 20 is mounted on the fixed position 111b, the positioning part wraps the outer side face of the workpiece 20, and the air cylinder 116 drives the connecting rod 117 to move forwards so that the second swing rod 114b is tightly pressed on the abutting part 115a, and therefore the abutting part 115a tightly presses the workpiece 20 on the positioning block 113. After the inflation flanger 10 has completed its work, the cylinder 116 drives the connecting rod 117 to move backwards so that the presser bar 115 releases the work piece 20.

Referring to fig. 7 to 11 in combination, in the present embodiment, the spinning flanging device 12 is a horizontal spinning flanging device, and the spinning flanging device 12 includes a sealing wheel mounting plate 121, a guide mechanism 122 and a spinning mechanism 123. A guide mechanism 122 and a spinning mechanism 123 are installed in the sealing wheel installation disc 121, and the guide mechanism 122 is used for righting the workpiece 20 so that the workpiece 20 and the spinning flanging device 12 are coaxially arranged. The spinning mechanism 123 is used for spinning the workpiece 20 so as to realize flanging of the workpiece 20. The sealing wheel mounting plate 121 has a cylindrical shape, and a cylindrical processing chamber 121a is formed at the center of the sealing wheel mounting plate 121. The guide mechanisms 122 are arranged in the sealing wheel mounting plate 121, the number of the guide mechanisms 122 is three, the three guide mechanisms 122 are uniformly distributed along the circumferential direction of the sealing wheel mounting plate 121, each guide mechanism 122 comprises a guide shaft 122a, a guide wheel 122b and a guide bearing 122c, the guide shafts 122a are fixed in the sealing wheel mounting plate 121, the guide wheels 122b are sleeved on the guide shafts 122a, and the guide bearings 122c are clamped between the guide wheels 122b and the guide shafts 122 a.

In the present embodiment, the number of spinning mechanisms 123 is three, the three spinning mechanisms 123 are uniformly distributed along the circumferential direction of the sealing wheel mounting disc 121, and one guide mechanism 122 is sandwiched between two adjacent spinning mechanisms 123. The spinning mechanism 123 includes a spinning roller 123a, a first bearing 123b, a second bearing 123c, a compression spring 123d, an adjusting pad 123e, a lock nut 123f, and a spinning shaft cover 123g. The spinning wheel 123a includes a spinning portion 123h and a spinning shaft 123i connected to the spinning portion 123h, the spinning portion 123h is basically in a shape of a circular truncated cone, the spinning portion 123h includes a first end 123j, a second end 123k opposite to the first end 123j, and a spinning surface 123l connecting the first end 123j and the second end 123k, the spinning surface 123l is formed with a linear spinning section 123m and a circular arc spinning section 123n connected to the linear spinning section 123m, a front end of the spinning shaft 123i is connected to the second end 123k, the spinning shaft 123i is disposed along a radial direction of the sealing wheel mounting disc 121, and the first end 123j of the spinning portion 123h faces a circle center of the sealing wheel mounting disc 121. The spinning shaft 123i is sleeved with a first bearing 123b, a second bearing 123c and a pressure spring 123d, the pressure spring 123d is clamped between the first bearing 123b and the second bearing 123c, an adjusting pad 123e is clamped between a first end 123j of the spinning part 123h and the first bearing 123b, a locking nut 123f is fixed at the rear end of the spinning shaft 123i, the first bearing 123b, the second bearing 123c and the pressure spring 123d are positioned between a second end 123k of the spinning part 123h and the rear end of the spinning shaft 123i, a spinning shaft end cover 123g is fixed on the outer side surface of the sealing wheel mounting disc 121, and the locking nut 123f and the rear end of the spinning shaft 123i are exposed to the outside through the spinning shaft end cover 123g.

The spinning flanging device 12 comprises two working processes, namely pre-flanging and flanging forming, wherein during pre-flanging, the position of the workpiece 20 to be flanged is positioned in a processing cavity 121a of a sealing installation plate, three uniformly distributed guide wheels 122b straighten the workpiece 20, the sealing installation plate rotates at a high speed and is pressed down, and an arc spinning section 123n of a spinning wheel 123a spins the top end of an oil storage cylinder 21 of the workpiece 20 into an inclined plane. When the flanging is formed, the sealing wheel mounting plate 121 rotates at a high speed and simultaneously presses downwards, the flanging pressure is increased, the spinning shaft 123i is forced to drive the adjusting pad 123e and the first bearing 123b to move backwards to compress the pressure spring 123d, at the moment, the spinning point is changed, the arc spinning section 123n is changed into a linear spinning section 123m, the linear spinning section 123m of the spinning wheel 123a spin-bends the top end of the oil storage cylinder 21 of the workpiece 20 into a flanging part 211 parallel to the linear spinning section 123m, and the flanging part 211 is tightly pressed on the oil seal 24 of the oil storage cylinder 21 and seals the top end of the oil storage cylinder 21.

Referring to fig. 31 and 32, in another embodiment, the spinning flanging device 12 is a vertical spinning flanging device, and the spinning flanging device 12 includes a sealing wheel mounting plate 121, a guide mechanism and a spinning mechanism 123. A straightening mechanism for straightening the workpiece 20 so that the workpiece 20 is coaxially disposed with the spinning flanging device 12 and a spinning mechanism 123 are installed in the sealing wheel installation plate 121. The spinning mechanism 123 is used for spinning the workpiece 20 so as to realize flanging of the workpiece 20. The sealing wheel mounting plate 121 is cylindrical, and a cylindrical processing chamber is formed at the center of the sealing wheel mounting plate 121. The number of the spinning mechanisms 123 is three, the three spinning mechanisms 123 are axially distributed at intervals around the sealing roller mounting disc 121, and each spinning mechanism 123 comprises a spinning roller 123a, a first bearing 123b, a second bearing, a pressure spring, an adjusting pad, a locking nut and a spinning shaft end cover. The spinning roller 123a includes a spinning portion 123h and a spinning shaft 123i connected to the spinning portion 123h, the spinning portion 123h is substantially in a circular truncated cone shape, a spinning surface is formed on an outer peripheral surface of the spinning portion 123h, the spinning surface 123l is formed with a linear spinning section 123m and a circular arc spinning section 123n connected to the linear spinning section 123m, and an axial direction of the spinning shaft 123i is parallel to an axial direction of the sealing roller mounting disc 121. The spinning shaft 123i is sleeved with a first bearing 123b, a second bearing and a pressure spring, the pressure spring is clamped between the first bearing 123b and the second bearing, an adjusting pad is clamped between one end of the spinning portion 123h and the first bearing 123b, a locking nut is fixed at the upper end of the spinning shaft 123i, the first bearing 123b, the second bearing and the pressure spring are located between one end of the spinning portion 123h and the upper end of the spinning shaft 123i, and the spinning portion 123h penetrates through the bottom surface of the sealing wheel mounting disc 121 to be exposed to the outside.

Referring to fig. 12 to 14 in combination, in the present embodiment, the inflator 13 includes a first clamping block 131, a second clamping block 132, a first clamping mechanism 133 and a second clamping mechanism 134, wherein the first clamping block 131 and the second clamping block 132 are used for enclosing to form a sealing cavity 13a, and the spinning flanging device 12 is accommodated in the sealing cavity 13 a. The first clamping mechanism 133 includes a first clamping cylinder 133a, a first cylinder block 133b, and a first clamp block 133c. The first clamping cylinder 133a is mounted on the first cylinder base 133b, and the left and right ends of the first clamping block base 133c are respectively connected with the first clamping cylinder 133a and the first clamping block 131, and the first clamping cylinder 133a drives the first clamping block 131 to move through the first clamping block base 133c. The second clamping mechanism 134 comprises a second clamping cylinder 134a, a second cylinder seat 134b and a second clamping block seat 134c, the second clamping cylinder 134a is mounted on the second cylinder seat 134b, the left end and the right end of the second clamping block seat 134c are respectively connected with a second clamping block 132 and the second clamping cylinder 134a, the second clamping cylinder 134a drives the second clamping block 132 to move through the second clamping block seat 134c, the second clamping block seat 134c is provided with an air inlet nozzle 13b, and the air inlet nozzle 13b is communicated with the sealing cavity 13 a.

Specifically, the first clamping block seat 133c is substantially rectangular, the left end of the first clamping block seat 133c is connected to the first clamping cylinder 133a, the right end of the first clamping block seat 133c is abutted to the left side surface of the first clamping block 131, two first hooks 133d are disposed at the right end of the first clamping block seat 133c, the two first hooks 133d are respectively fixed to the upper surface and the lower surface of the first clamping block seat 133c, two first clamping grooves 131a are correspondingly formed on the left side surface of the first clamping block 131, and each first hook 133d is clamped in one first clamping groove 131 a. The second clamping block seat 134c is basically rectangular, the left end of the second clamping block seat 134c is abutted against the right side surface of the second clamping block 132, the right end of the second clamping block seat 134c is connected with the second clamping cylinder 134a, two second clamping hooks 134d are arranged at the left end of the second clamping block seat 134c, the two second clamping hooks 134d are respectively fixed on the upper surface and the lower surface of the second clamping block seat 134c, two second clamping grooves 132a are correspondingly formed on the right side surface of the second clamping block 132, and each second clamping hook 134d is clamped in one second clamping groove 132 a.

In the present embodiment, the air inlet nozzle 13b is disposed on the upper surface of the second clamping block seat 134c, and the air inlet channel 13c is formed by the second clamping block seat 134c and the second clamping block 132 together, and the air inlet channel 13c communicates with the air inlet nozzle 13b and the sealing cavity 13 a. The right side of the first clamping block 131 is formed with a first edge, the left side of the second clamping block 132 is formed with a second edge, the first edge can be abutted with the second edge to form a sealing cavity 13a, and sealing layers are arranged at the first edge and the second edge to ensure the sealing performance when the first clamping block 131 and the second clamping block 132 are enclosed. The first semicircular grooves are formed in the upper surfaces of the first clamping block 131 and the second clamping block 132, the two first semicircular grooves are symmetrically arranged, the two first semicircular grooves can be enclosed to form a first sleeving position 13d, the first sleeving position 13d is used for being jointed with the rotary sealing device 14, the second semicircular grooves are formed in the lower surfaces of the first clamping block 131 and the second clamping block 132, the two second semicircular grooves are symmetrically arranged, the two second semicircular grooves can be enclosed to form a second sleeving position 13e, the second sleeving position 13e is used for being jointed with the oil storage cylinder 21 of the workpiece 20, and the first sleeving position 13d and the second sleeving position 13e are both provided with sealing rings 13f to ensure the tightness of joints.

The operation of the inflator 13 is as follows: after the workpiece 20 is placed, the first clamping cylinder 133a drives the first clamping block 131 through the first clamping block seat 133c, the second clamping cylinder 134a drives the second clamping block 132 through the second clamping block seat 134c, the first clamping block 131 and the second clamping block 132 hold the workpiece 20, the first clamping block 131 and the second clamping block 132 are in butt joint to form a sealing cavity 13a, and air is filled into the inner cavity of the workpiece 20 along the air inlet channel 13c through the air inlet nozzle 13 b.

Referring to fig. 15 and 16 in combination, in the present embodiment, the rotary sealing device 14 is coaxially disposed with the spinning flanging device 12, the rotary sealing device 14 includes a fixing mechanism 141 and a rotating mechanism 142, the rotating mechanism 142 can rotate relative to the fixing mechanism 141, and the rotating mechanism 142 is connected with the spinning flanging device 12 to drive the spinning flanging device 12 to rotate.

Specifically, the rotary seal device 14 is substantially cylindrical in shape as a whole, and a part of the rotary seal device 14 extends from the first socket 13d into the seal chamber 13a of the inflator 13, and another part of the rotary seal device 14 is exposed. The rotary sealing device 14 comprises an inflatable rotary sleeve 141b, a rear end cover 141a, an outer rotary sealing gland 141c, a spinning main shaft 142a, a transitional flange 142b and a pressing cylinder connecting rod 14a, the inflatable rotary sleeve 141b is basically cylindrical, the rear end cover 141a and the outer rotary sealing gland 141c are respectively fixed at the upper end and the lower end of the inflatable rotary sleeve 141b, the spinning flanging device 12 is positioned below the outer rotary sealing gland 141c, a transitional flange 142b is clamped between the spinning flanging device 12 and the outer rotary sealing gland 141c, the spinning main shaft 142a is arranged in the inflatable rotary sleeve 141b in a penetrating manner, the spinning main shaft 142a is fixedly connected with the transitional flange 142b, the transitional flange 142b is fixedly connected with the pressing cylinder connecting rod 14a, the pressing cylinder connecting rod 14a is arranged in the inflatable rotary sleeve 141b in a penetrating manner, the pressing cylinder connecting rod 14b is coaxially arranged with the inflatable rotary sleeve 141b, a follow-up sealing ring 14f is arranged on the follow-up sealing ring seat 14b, a first rotary sealing ring 14f is arranged on the follow-up sealing ring 14b, a first rotary sleeve 14c is arranged between the spinning flanging device 12 and the spinning main shaft 142a, a first rotary sleeve 14c is arranged in a first rotary bearing 14c and a rotary sealing ring 142c is arranged in a second bearing seat 142d, a pressing seal ring 142d is arranged in a pressing manner, a pressing cylinder connecting rod 142d is arranged in a pressing cylinder connecting rod 142d is arranged between the first and a first sealing ring 142b and a second sealing ring 142d, a is arranged in a pressing sealing ring 142d, a pressing sealing ring 142d is arranged in a pressing sealing ring 142b and a pressing sealing ring 14b and a pressing sealing ring and a 14b is arranged in a pressing sealing ring 142 b. The fixing mechanism 141 includes a rear end cover 141a, an inflatable swivel sleeve 141b, and an outer rotary seal gland 141c, and the rotary mechanism 142 includes a spinning spindle 142a, a transition flange 142b, a first inner seal ring seat 142c, and a second inner seal ring seat 142d.

The rotary sealing device 14 works as follows: when the air charging device 13 charges the workpiece 20, the first clamping cylinder 133a and the second clamping cylinder 134a respectively drive the first clamping block 131 and the second clamping block 132 to move oppositely, butt joint and clamp each other, the spinning main shaft 142a drives the spinning flanging device 12 to rotate at a high speed and press down through the transition flange 142b, the rear end cover 141a, the air charging swivel sleeve 141b and the outer rotating sealing gland 141c are connected together and do not rotate, and the spinning main shaft 142a, the transition flange 142b, the first inner sealing ring seat 142c and the second inner sealing ring seat 142d rotate together, so that the spinning main shaft 142a can rotate through the first swivel bearing 14c and the second swivel bearing 14 e.

In the present embodiment, the inflation flanger 10 further includes a mounting plate 10a and an elastic member 10b connecting the mounting plate 10a and the rear end cap 141 a. The elastic member 10b is disposed in a direction parallel to the axial direction of the spinning-flanging device 12, one end of the elastic member 10b is fixedly connected with the mounting plate 10a, and the other end of the elastic member 10b is connected with the rear end cap 141 a. Preferably, the elastic members 10b are two springs, and the two springs are respectively disposed at the left and right sides of the spinning flanging device 12 in the axial direction. The rotary sealing device 14 is fixed on the mounting plate 10a, the spinning flanging device 12 is fixed on the rotary sealing device 14, the rotary sealing device 14 and the spinning flanging device 12 are coaxially arranged, and the rotary sealing device 14, the spinning flanging device 12 and the inflating device 13 are axially symmetrical. The first clamping block seat 133c is provided with a first axial limiting clamping piece 10c, the second clamping block seat 134c is provided with a second axial limiting clamping piece 10d, the first axial limiting clamping piece 10c and the second axial limiting clamping piece 10d are used for realizing axial limiting on the flanging device 12, the first axial limiting clamping piece 10c and the second axial limiting clamping piece 10d are basically in a shape like a Chinese character 'yi', the first axial limiting clamping piece 10c comprises a first fixing part 10e, a first clamping part 10f and a first extending part 10g for connecting the first fixing part 10e and the first clamping part 10f, and the second axial limiting clamping piece 10d comprises a second fixing part 10h, a second clamping part 10i and a second extending part 10j for connecting the second fixing part 10h and the second clamping part 10 i. The first axial limit clip 10c and the second axial limit clip 10d are symmetrical with respect to the axial direction. The first fixing portion 10e is fixedly connected with the first clamping block seat 133c, the second fixing portion 10h is fixedly connected with the second clamping block seat 134c, and the first clamping portion 10f and the second clamping portion 10i are used for clamping the rear end cover 141a, so that the spinning flanging device 12 is limited in the axial direction.

When the inflator 13 works, the first clamping block 131 and the second clamping block 132 form a sealing cavity 13a, and the pressure rise forces the spinning flanging device 12 to overcome the pressure rise of the elastic piece 10b, and the first axial limiting clamping piece 10c and the second axial limiting clamping piece 10d buckle the rear end cover 141a, so that the spinning flanging device 12 is limited in the axial direction, and the spinning flanging device 12 is not raised any more.

Referring to fig. 17 to 19 in combination, in the present embodiment, the dual screw pressure feeding device 15 includes a feeding motor 151, a first transmission mechanism 152, a second transmission mechanism 153, a first screw 154, a second screw 155, a first screw nut 156, a first screw nut seat 157, a second screw nut 158, a second screw nut seat 159, a lifting plate 15a, and a fixing plate 15b. The first transmission mechanism 152 includes a first driving pulley 152a, a first driven pulley 152b, and a first belt 152c connecting the first driving pulley 152a and the first driven pulley 152b, and the first driven pulley 152b is connected to a first screw 154. The second transmission mechanism 153 includes a second driving pulley 153a, a second driven pulley 153b, and a second belt 153c connecting the second driving pulley 153a and the second driven pulley 153b, the second driven pulley 153b is connected with a second screw rod 155, the feeding motor 151 is used for driving the first driving pulley 152a and the second driving pulley 153a, the first driving pulley 152a is located above the second driving pulley 153a, the first driving pulley 152a and the second driving pulley 153a are coaxially arranged, and the first screw rod 154 and the second screw rod 155 are used for driving the lifting plate 15a to move up and down. The lifting plate 15a is fixed with a first screw nut base 157 and a second screw nut base 159, the first screw 154 is connected to the first screw nut base 157 by a first screw nut 156, and the second screw 155 is connected to the second screw nut base 159 by a second screw nut 158. The rotary sealing device 14 and the spinning flanging device 12 are installed on the bottom surface of the lifting plate 15a, the spinning flanging device 12 is located below the rotary sealing device 14, the first screw rod 154 and the second screw rod 155 are located on two sides of the axis of the spinning flanging device 12 respectively, the first screw rod 154 and the second screw rod 155 are parallel and opposite, the first screw rod nut seat 157 is close to the left side edge of the lifting plate 15a, the second screw rod nut seat 159 is close to the right side edge of the lifting plate 15a, the lifting plate 15a and the fixing plate 15b are parallel, the feeding motor 151, the first transmission mechanism 152 and the second transmission mechanism 153 are installed on the top surface of the fixing plate 15b, and two ends of the first screw rod 154 and the second screw rod 155 penetrate through the fixing plate 15b and the lifting plate 15a respectively. Preferably, the first driving pulley 152a and the second driving pulley 153a are of a unitary structure. In this way, the first screw rod 154 and the second screw rod 155 balance the downward pressure, and the transmission is more stable.

The working process of the double wire rod pressure feeding device 15 is as follows: the feeding motor 151 rotates to drive the first driving pulley 152a and the second driving pulley 153a, the first driving pulley 152a drives the first driven pulley 152b through the first belt 152c, the first driven pulley 152b drives the first screw rod 154, the first screw rod 154 and the first screw rod nut 156 convert the rotary motion into the linear motion, the second driving pulley 153a drives the second driven pulley 153b through the second belt 153c, the second driven pulley 153b drives the second screw rod 155, the second screw rod 155 and the second screw rod nut 158 convert the rotary motion into the linear motion, and the lifting plate 15a moves up and down synchronously.

Referring to fig. 20 to 22 in combination, in the present embodiment, the inflation flanging machine 10 further includes a screw assembly 16, and the screw assembly 16 includes a driving mechanism 161, a screw rod 162, a universal joint 163, and a screw head 164. The driving mechanism 161 is used for driving the screwing rod 162 to rotate. The driving mechanism 161 includes a screw driving motor 161a, a screw driving tooth 161b and a screw driven tooth 161c, the screw driving motor 161a is connected with the screw driving tooth 161b, the screw driving tooth 161b is meshed with the screw driven tooth 161c, the screw 162 includes a first connection end 162a and a second connection end 162b opposite to the first connection end 162a, the first connection end 162a of the screw 162 is connected with the screw driven tooth 161c, a universal joint 163 is provided on the screw 162, the universal joint 163 is located between the first connection end 162a and the second connection end 162b and is located near the second connection end 162b, and the second connection end 162b of the screw 162 is fixedly connected with the screw head 164. The first connecting end 162a of the screw rod 162 is sleeved with a rotating sleeve 16a, and a rotating bearing 16b is arranged between the rotating sleeve 16a and the screw rod 162. The driving mechanism 161 is mounted on the connecting plate 16c, the turning gear lever driving teeth 161b and the turning gear lever driven teeth 161c are located on the top surface of the connecting plate 16c, the body of the turning gear lever motor 161a is located below the connecting plate 16c, the bottom surface of the connecting plate 16c is provided with a motor adjusting plate 16d, the body of the turning gear lever motor 161a is fixed on the motor adjusting plate 16d, the driving shaft of the turning gear lever motor 161a passes through the connecting plate 16c to be connected with the turning gear driving teeth, the turning gear lever 162 passes through the connecting plate 16c to be connected with the turning gear lever driven teeth 161c, the universal joint 163 and the turning gear head 164 are located below the connecting plate 16c, and the turning gear head 164 is formed with internal threads to be in threaded connection with the piston rod 22 of the workpiece 20.

The turning gear lever motor 161a drives the turning gear lever 162 to rotate through the turning gear lever driving teeth 161b and the turning gear lever driven teeth 161c, and then drives the turning gear head 164 to be screwed with the threads on the workpiece 20 through the universal joint 163. In this way, the screw head 164 is flexibly connected in both directions X, Y axis by the universal joint 163, thereby ensuring that the screw head 164 can be screwed into threaded connection with the workpiece 20 even when the screw rod 162 is not concentric with the thread of the workpiece 20.

Referring to fig. 23 to 27 in combination, in the present embodiment, the inflation flanging machine 10 further includes a pulling rod mechanism 17, and the pulling rod mechanism 17 includes a pulling rod power device 171, a lifting frame 172, a moving plate 173, a threading screw 174, and a threading screw nut 175. The movable plate 173 is provided with the screw assembly 16, the movable plate 173 is slidably mounted on the lifting frame 172, the screw 174 is connected with the movable plate 173 through the screw nut 175, and the screw power device 171 is used for driving the screw 174 to rotate so as to realize the up-and-down movement of the movable plate 173 along the lifting frame 172. The rod pulling power device 171 comprises a tooth screwing motor 171a, a tooth screwing driving wheel 171b and a tooth screwing driven wheel 171c, wherein the tooth screwing motor 171a is connected with the tooth screwing driving wheel 171b, the tooth screwing driving wheel 171b is connected with the tooth screwing driven wheel 171c, and the tooth screwing driven wheel 171c is connected with the tooth screwing screw 174. The pulling rod mechanism 17 is mounted on the lifting plate 15a, the lifting frame 172 comprises two opposite side vertical plates 172a, the two side vertical plates 172a are fixed on the lifting plate 15a, a wire rail 172b is arranged on each side vertical plate 172a, a movable plate 173 is slidably mounted between the two wire rails 172b, one end of a tooth screwing screw 174 is fixed at the top end of the lifting frame 172, and the other end of the tooth screwing screw 174 is connected with a tooth screwing driven wheel 171 c.

When the inflator 13 is required to inflate the workpiece 20, it is necessary to first pull out the piston rod 22 of the workpiece 20 so that a gap is formed between the guide 23 fixed to the piston rod 22 and the oil reservoir 21 to allow air to enter. The process of pulling the piston rod 22 by the inflation flanging machine 10 is as follows: first, the screw motor 171a drives the screw rod 174 to rotate through the screw driving wheel 171b and the screw driven wheel 171c, and the screw rod nut 175 converts the rotational motion into linear motion to drive the moving plate 173 to move downward, thereby realizing the downward motion of the screw rod 162. Then, the turning gear lever motor 161a drives the turning gear lever 162 to rotate through the turning gear lever driving teeth 161b and the turning gear lever driven teeth 161c, and drives the screw threads of the screw head 164 and the piston rod 22 of the workpiece 20 to be screwed together through the universal joint 163. The threading motor 171a is reversed to drive the moving plate 173 to move upward, thereby realizing the pulling-up of the piston rod 22 on the workpiece 20.

Referring to fig. 28 in combination, in the present embodiment, the inflation flanging machine 10 further includes a compression bar power device 18, the compression bar power device 18 includes a compression cylinder 181, a compression connecting rod 182 and a compression bar 183, the compression cylinder 181 is mounted on the lifting frame 172, after the piston rod 22 is pulled up to be inflated, the cylinder rod of the compression cylinder 181 extends and presses down, the cylinder rod of the compression cylinder 181 abuts against the compression connecting rod 182, the compression bar 183 abuts against the oil seal 24 of the oil storage cylinder 21 of the workpiece 20, and the oil seal 24 abuts against the guide 23 of the oil storage cylinder 21, thereby pressing the guide 23 into the oil storage cylinder 21.

Referring to fig. 29 and 30 in combination, in the present embodiment, the inflation flanging machine 10 further includes an anti-refuting force measuring mechanism 19, the anti-refuting force measuring mechanism 19 includes a weighing sensor 191, a sensor pressure head 192 and a sensor pressure head 193, the sensor pressure head 193 is disposed on the driven tooth 161c of the screwing tooth bar, a taper groove 162c is formed along the axial indent of the first connecting end 162a of the screwing tooth bar 162, the sensor pressure head 193 faces the taper groove 162c, the sensor pressure head 192 is located right above the sensor pressure head 193, the weighing sensor 191 is electrically connected with the sensor pressure head 192, and the weighing sensor 191 is located right above the sensor pressure head 192.

After the inflation flanging of the inflation flanging machine 10 is completed, the screwing rod 162 is withdrawn from the thread of the workpiece 20, the piston rod 22 rises due to the air pressure, the piston rod 22 props against the screwing rod 162 to drive the screwing rod driven tooth 161c and the sensor push rod 193 to rise until the screwing rod driven tooth is pushed onto the sensor pressure head 192, and thus the thrust data of the piston rod 22 can be read on the weighing sensor 191.

The working process of the inflation flanging machine 10 of the present invention is as follows: the workpiece 20 is inflated and then turned over, and finally the thrust of the piston rod 22 is measured, wherein the inflation device 13 and the spinning turn-over device 12 are completed at the same station, inflation and turn-over are completed in the sealing cavity 13a, the oil seal 24 is not damaged, and the sealing performance of the manufactured shock absorber is ensured.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The inflation flanging machine is used for inflation flanging of a shock absorber, and comprises a spinning flanging device, an inflation device and a rotary sealing device, wherein the spinning flanging device comprises a spinning mechanism, the spinning mechanism comprises a spinning wheel with a bevel position and a spinning position, the bevel position is used for pressing down the bevel position of the workpiece to plate out the bevel, the spinning position is used for carrying out straight face flattening on the workpiece with the bevel, and the spinning wheel can be controlled by the magnitude of external force applied to the spinning mechanism to generate axial displacement so as to enable a working face opposite to the workpiece to be switched between the bevel position and the spinning position;

The air charging device comprises a first clamping block, a second clamping block, a first clamping mechanism and a second clamping mechanism, wherein the first clamping block and the second clamping block are used for enclosing to form a sealing cavity, and the spinning flanging device is accommodated in the sealing cavity;

The first clamping mechanism comprises a first clamping oil cylinder, a first oil cylinder seat and a first clamping block seat; the first clamping cylinder is arranged on the first cylinder seat, the left end and the right end of the first clamping block seat are respectively connected with the first clamping cylinder and the first clamping block, and the first clamping cylinder drives the first clamping block to move through the first clamping block seat;

The second clamping mechanism comprises a second clamping cylinder, a second cylinder seat and a second clamping block seat, the second clamping cylinder is arranged on the second cylinder seat, the left end and the right end of the second clamping block seat are respectively connected with a second clamping block and the second clamping cylinder, the second clamping cylinder drives the second clamping block to move through the second clamping block seat, an air inlet nozzle is arranged on the second clamping block seat, and the air inlet nozzle is communicated with the sealing cavity;

The rotary sealing device is used for ensuring the tightness when the workpiece is inflated and turned;

When the air charging device charges a workpiece, firstly, a piston rod of the workpiece is pulled up, so that a gap is formed between a guide fixed on the piston rod and the oil storage cylinder for air intake;

The spinning mechanism further comprises a first bearing, a second bearing and a pressure spring, the spinning roller comprises a spinning part and a spinning shaft connected with the spinning part, the spinning part comprises a first end, a second end opposite to the first end and a spinning surface connected with the first end and the second end, the spinning surface is used for spinning the workpiece, the spinning surface is formed with a linear spinning section and an arc spinning section connected with the linear spinning section, the linear spinning section is formed with a spinning flat position, the arc spinning section is formed with an inclined surface position, the front end of the spinning shaft is connected with the second end, the first bearing, the second bearing and the pressure spring are sleeved on the spinning shaft, the pressure spring is clamped between the first bearing and the second bearing, and the spinning roller can move along the axial direction of the spinning shaft;

an adjusting pad is clamped between the first end and the first bearing.

2. The inflatable flanger of claim 1, wherein a lock nut is secured to a rear end of the spinning shaft.

3. The inflatable flanger of claim 2 wherein said spin-flanging device comprises a sealing wheel mounting plate and a guide mechanism mounted within said sealing wheel mounting plate with said spin-down mechanism for centering said workpiece such that said workpiece is coaxially disposed with said spin-flanging device.

4. The gas-filled flanger of claim 3, wherein said first bearing, said second bearing and said compression spring are located between the rear end of said spinning shaft and said second end, the outer side of said sealing wheel mounting plate being secured with a spinning shaft end cap, the rear ends of said lock nut and said spinning shaft being exposed through said spinning shaft end cap.

5. The gas-filled flanger of claim 4, wherein said sealing wheel mounting plate is cylindrical, said number of spinning mechanisms is three, and said spinning mechanisms are uniformly distributed along the circumferential direction of said sealing wheel mounting plate.

6. The gas-filled flanger of claim 5, wherein the spinning shaft is disposed radially of the sealing wheel mounting plate, a first end of the spinning portion being oriented toward a center of the sealing wheel mounting plate.

7. The gas-filled flanger of claim 6 wherein the number of said guide means is three, said guide means being evenly distributed along the circumferential direction of said sealing wheel mounting plate, said spinning means being spaced from said guide means.

8. The gas-filled flanger of claim 7, wherein each of said guide mechanisms comprises a guide shaft, a guide wheel and a guide bearing, said guide shaft being fixed in said sealing wheel mounting plate, said guide wheel being mounted on said guide shaft, said guide bearing being interposed between said guide wheel and said guide shaft.