KR20040083345A - Device for stretching a tie-rod - Google Patents

Abstract

PURPOSE: A stretching device of a tie rod is provided to realize the strong tensile force and a compact structure and to secure the excellent assembling property. CONSTITUTION: Both pistons(6,7) and the lowest piston(6) are combined with a tie rod(1) to be detachable by a center bolt. A screw hole(13) is formed in the lower part of the lowest piston to be combined with the tie rod. The screw hole is formed in the lower part of the piston(7) to be combined with a screw pin to be protruded from the piston(6). Cylinder portions(8,9) are combined to be detachable by a moving device(27).

Description

Tie rod stretching device {DEVICE FOR STRETCHING A TIE-ROD}

The present invention relates to a device for elongation of a tie rod for receiving a nut, the apparatus comprising: a plurality of pistons arranged in series including a piston head each connected to one shaft, a piston device coupled to the tie rod, and each of the corresponding pistons. By enclosing the piston head at the bottom, it defines a pressure chamber filled with pressurized medium, has a collar projecting radially inward, and a plurality of cylinder parts arranged in series in which the piston is accommodated, and the nut can be wrapped to tighten the nut. A tie rod (TIE-ROD), in particular applied to a cylinder of a large engine, comprising a cylinder arrangement supported by a support on which a through-window for the insertion of a tool is formed.

Devices of the above-mentioned type are known from DE 93 16 464 U1. This known device is equipped with a tie bar which is connected to the tie rod, which has a sleeve which can be tightened to the tie rod at the bottom thereof, and at the top there is a radially protruding crown. The crown is supported by a top piston of a piston device disposed between the sleeve and the crown. The pistons arranged in series of the piston device do not rigidly engage with each other, but are only supported in a relaxed state. In contrast, the cylinder units arranged in series of the cylinder arrangement are bolted together and form a rigid housing unit. The piston device can be configured in a multi-piece form to generate a strong force in a narrow structure. However, the tie bars required by known devices result in a relatively high structure. In addition, the weight of the tie bars, which also accommodates all the pistons of the piston device, is also relatively increased. The same applies to cylinder arrangements formed as rigid units, including cylinder portions rigidly coupled to one another. This disadvantage makes it difficult to manipulate the assembly and disassembly of the device according to the invention.

In DE 196 13 444 C1 a device is known for the extension of a tie rod comprising a nut, in which no tie bar is required as the piston device is directly connected to the tie rod. However, in such a known device, since the piston device has only one piston, a relatively large diameter is required in order to achieve sufficient force, which inevitably increases the volume of the entire structure and requires a high space. Have a problem.

It is therefore an object of the present invention to provide a device of the type described above simply and inexpensively so that not only strong tensile forces can be achieved, but also thin and compact structures can be realized, and excellent assembly is ensured.

1 is a cross-sectional view of a device according to the invention in a loaded state.

FIG. 2 is a sectional view of the apparatus according to FIG. 1 with no load applied; FIG.

3 is an enlarged view of a moving device of the device according to FIGS. 1 and 2.

-Explanation of symbols for the main parts of the drawings-

1: tie rod 2: head

3: nut 4: parts

5: Traction device 6, 7: Piston

8, 9: cylinder portion 10: support portion

11: window 12: hall

13: hole 14: screw pin

15 shaft 16 head

17 contact surface 18 color

19, 20: pressure chamber 21: ring

22 bore system 23 connection ripple

24: engaging portion 25: radial support surface

26: net 27: mobile device

28: radial hole 29: connecting pin

30: inserting device 31: return spring

32: blind hole 33: stop surface

34: slot 35: support pin

36: cover 37: spring device

38, 39: clearance 40: pressure reducing valve

41: Bore 42: Pushbutton

43: noise

The object of the present invention is a screw in which the pistons arranged in series of the piston device and the lowermost piston are respectively detachable from the tie rod by one central bolting, and the lowermost piston is opened downward and is coupled with the tie rod. Each of the cylinders arranged in series has a bore, and each of the other pistons is coupled to a threaded pin that protrudes from the piston present at its lower end, and has a threaded hole which is coaxial with and opens downwardly. By engaging in a form that is separable from each other by an acceptable mobile device.

In the assembled state, the piston device forms a unit that is directly coupled to the tie rod and capable of continuously applying a tensile load. No tie bar is required in the device according to the invention. Thus, preferably the lowest pressure chamber can be arranged at a very low position, thereby reducing the overall height of the structure. In addition, the pistons of the piston device, which are bolted to each other, are capable of separate transport and manipulation, thereby facilitating easy transport, assembly and disassembly of the device according to the invention. The same applies to the cylinder section. In operation, only the cylinder is pressurized, and the mobile device does not have any function. The mobile device functions only in the depressurized state. Thereby, it is possible to raise a cylinder apparatus entirely from a support part by a restoring apparatus in a decompression state. The moving device only carries the weight of the cylinder part. Therefore, a simple lightweight structure of the mobile device can be realized. Excellent assembly is ensured because the cylinder parts can be individually operated for transport, assembly and disassembly of the device according to the invention.

Preferred forms and variations of the device according to the invention are specified in the dependent claims. Preferably the diameter of the piston side threaded pin is formed smaller than the diameter of the tie rod. By doing this, the collar of each upper cylinder part can be expanded larger than the collar of the lowest cylinder part. Therefore, when the piston heads have the same outer diameter, the effective cross-sectional area of each upper pressure chamber exceeds the cross-sectional area of the lowermost pressure chamber, and thus a strong force can be realized even with a relatively small number of pistons. In this way, even with two pistons in general, sufficient force can be obtained, and thus a very compact structure can be obtained.

In another preferred measure, the moving device has at least one connecting pin disposed in the radial hole of each lower cylinder portion, which connecting pin counters the force of the return spring by means of an insertion device attached in a form operable at the upper cylinder portion. It is inserted into the bore of the neck of the upper cylinder part in contact with the lower cylinder part. If the insertion device does not come into contact with the connecting pin, the cylinder part is automatically separated, thereby facilitating the operation.

Preferably the insertion device is formed as a ring that wraps around. The insertion device can operate a plurality of connecting pins at the same time. Therefore, the moving device preferably has a plurality of connecting pins distributed evenly around.

In another preferred measure, the insertion device is attached in an axially movable form and can be moved to the contact position by virtue of its weight, which weight is sufficient to move each corresponding connecting pin against the Greton spring. Therefore, when the upper cylinder portion is mounted on the lower cylinder portion is automatically engaged, thereby ensuring excellent stability.

In another embodiment of the present invention, a cover attachable to the uppermost cylinder portion is mounted, and a return spring device that cooperates with the uppermost piston is supported by the cover. This enables the ventilation of the cylinder device upon depressurization of the pressure chamber.

In another highly preferred measure, a pressure reducing valve is received in the piston head of the uppermost piston, which is connected to the pressure chamber via a bore through the piston head and is actuated by a push button, which push cover Can be squeezed from below. Therefore, excessive extension of the tie rods is reliably suppressed.

Preferred forms and modifications of the device according to the invention are specified in the other dependent claims and are explained in detail in the following description of the embodiments based on the drawings.

Examples

The main field of application of the present invention is a large engine, such as a two-stroke large engine, in which a cylinder is engaged with the frame by a tie rod or each frame part is fastened by such a tie rod, each comprising a nut. to be. 1 and 2 show a tie rod 1 with a threaded head 2 fastened to a nut 3. This nut 3 is arranged on a component 4, for example a cylinder cover, which is penetrated by the tie rod 1.

To tighten the nut 3 the tie rod 1 is elongated by a pulling device 5 so that the desired initial stress is retained. The nut 3 is then tightened downwards until it is fully in contact with the part 4. The traction device 5 is then relaxed to squeeze the nut 3 onto the part 4 with the initial stress of the tie rod 1.

This traction device 5 comprises a piston device which is coupled with a tie rod 1, here consisting of two pistons 6, 7 arranged in series in the axial direction, which piston device is in the axial direction. It is accommodated in the cylinder device which consists of the cylinder parts 8 and 9 arranged in series. The number of cylinder portions corresponds to the number of pistons mounted. The cylinder device formed by these cylinder parts 8, 9 is seated on the part 4 which houses the nut 3, surrounds the nut 3, and is substantially spacer between the part 4 and the cylinder device. It is supported by the support 10 that serves as. This support can be formed as an annular ring. In the illustrated embodiment, the support 10 is formed as a rectangular frame, whereby a strong stability against deformation is achieved. The support 10 has a plurality of windows 11 at its perimeter, through which a tool that engages the nut 3 to rotate the nut 3 can be guided through this window. In the illustrated embodiment, a radial hole 12 into which a bar is inserted is formed in the circumferential surface of the nut 3.

The lower piston 6 can be released in the end direction of the threaded head 2 of the tie rod 1 protruding from the nut 3. Also, the upper piston 7 can be released from the lower piston 6. The screw fastening has a tolerability and compression resistance and forms a detachable fastening. Correspondingly, both pistons 6, 7 are coupled to each other to have traction and compression resistance, and the entire piston device is also coupled to the tie rod 1 with traction and compression resistance. Can be. To this end, a screw hole 13 is formed in the center lower portion of the lower piston 6 to be aligned with the tie rod 1, so that the upper end of the threaded head 2 of the tie rod 1 can be fastened. The upper piston 7 is likewise aligned side by side with the tie rod 1, and is formed with a screw hole 13 which opens to the lower center. A threaded pin 14 protruding upward from the lower piston 6 can be fastened to this screw hole. The pistons 6, 7 have one shaft 15 each having a corresponding threaded hole 13, one piston head 16 abutting the shaft. The screw hole 13 also extends to the piston head 16.

The cylinder parts 8, 9 have one contact surface 17 each slidably in contact with the circumferential surface of the piston head 16, which contact surface projects radially inward and the corresponding piston head 16. ) Is in contact with a collar 18 wrapping at the bottom. The diameters of the contact surfaces 17 of the upper and lower cylinders 8, 9 and the circumferential diameters of the piston head 16 of the upper and lower pistons 6, 7, which cooperate with it, are also the same. However, the diameter of the threaded pin 14 of the lower piston 6 is smaller than the diameter of the threaded head 2 of the tie rod 1. Therefore, when the wall thickness is the same in the section of the piston shaft 15, the collar 18 of the upper cylinder 9 may be wider than the collar 18 of the lower cylinder 8.

The piston 18 and the piston head 16 of each piston-cylinder pair in cooperation each define one pressure chamber. Accordingly, the lower pressure chamber 19 and the upper pressure chamber 20 are formed. The pressure chambers 19 and 20 are sealed to the contact surface 17 of the cylinder part and the contact surface of the shaft 15 by the sealing ring 21 which wraps around. As noted above, the wider width of the upper collar 18 causes the upper pressure chamber 20 to have a larger cross sectional area than the lower pressure chamber 19.

These pressure chambers 19, 20 are connected via a connection nipple 23 for supplying pressurized medium formed on the upper surface of the upper piston 7 and a bore system 22 formed in the pistons 6, 7. do. The piston device in contact with the tie rod 1 is exerted with a force directed upwards due to the pressure rise in the pressure chambers 19, 20, by which the tie rod 1 is extended. A force directed downward is applied to the cylinder device, which is transmitted to the part 4 via the support 10. Due to the direct contact of the piston device in the tie rod 1, the lower boundary of the piston head of the lower piston and the lower pressure chamber 19 can be arranged relatively low. This boundary may be significantly lower than the upper end of the threaded head 2 of the tie rod 1 inserted into the piston head 16 of the lower piston 6.

The cylinder parts 8, 9 arranged in series, which are pressurized during operation, are in contact with the radial support surfaces 25 facing each other. The upper cylinder portion 9 has a neck 26 in contact with the upper end of the lower cylinder portion 8 for fixing in the radial direction. The cylinder parts 8, 9 are coupled in the axial direction by a carrier device 27. As will be described in detail in the following description, this coupling is made only upon depressurization of the pressure chambers 19, 20. A detachable pin-slot coupling 24 can be mounted for rotational fixation between the piston device and the cylinder device.

As shown in detail in FIG. 3, the moving device 27 has at least one connecting pin 29 arranged in the radial hole 28 of the lower cylinder 8. This connecting pin is concentric with the bore 28 against the force of the return spring 31 in contact with the tooth insertion device via an insertion device 30 operatively attached to the top and bottom of the upper cylinder 9. It can be inserted into the blind hole 32 of the neck 26 of the upper cylinder 9, formed in the. As can be seen in Figures 1 and 2, in the illustrated embodiment, this insertion device 30 is formed as a ring that wraps around. The insertion device thus comprises a plurality of connecting pins 29. Preferably, the plurality of connecting pins are arranged to be evenly distributed around the lower cylinder portion 8.

The ring forming the insertion device 30 has a stop face 33 which is inclined at its lower edge, which stops each connecting pin 29 in contact with the axial movement of the insertion device 30. Switch to radial motion. The ring forming the insertion device 30 has a slot 34 running in the axial direction, and since the support pin 35 attached to the upper cylinder portion 9 is inserted into this slot, the shaft of the insertion device 30 Pin-slot coupling is made to enable directional operation. The ring forming the insertion device 30 moves each connecting pin 29 in contact with the inclined stop face 33 radially inwards and makes contact with the corresponding blind hole 32, thereby moving to a fixed position. Have enough weight to make.

The upper cylinder portion 9 has a cover 36 that is detachable. A return spring arrangement 37, denoted as a coil spring, is supported on this cover, which also cooperates with the upper piston 7 of the piston arrangement. As already mentioned above, when pressure is applied to the pressure chambers 19 and 20, the upward force is applied to the piston device, and the downward force is applied to the cylinder device. The piston device operates upward relative to the cylinder device supported on the support 10, and the return spring device 37 is compressed. Further, the tie rod 1 extends in the longitudinal direction, and the nut 3 rises from the part 4 by the gap 38 as shown in FIG.

The nut 3 is then tightened to the bottom until it is fully in contact with the part 4. After this, the pressure chambers 19 and 20 are depressurized. The piston device in direct contact with the tie rod 1 is held in a position corresponding to the extended tie rod 1. As shown in Fig. 2, the return spring device 37 supported here raises the cylinder device correspondingly until the pressure chambers 19, 20 are reduced to their minimum volume. As can be seen through the gap 39 in FIG. 2, the cylinder device is lifted from the support 10. As shown in Fig. 2, when the collars 18 and the shoulders of the piston head 16, which face each other, come into contact with each other, the minimum volume state of the pressure chambers 19, 20 is reached. On the other hand, the cylinder device as well as the upper cylinder part 9 can be lifted by the above-mentioned moving device 27.

In order to limit the stroke of the piston device and the corresponding extension of the tie rod 1 to the desired extent, a stroke limiting device is fitted. The piston head 16 of the upper piston 7 is equipped with a pressure reducing valve 40 for this purpose, which pressure reducing valve 40 is provided with at least one pressure chamber through the bore 41 passing through the piston head 16. In the embodiment it is connected with the upper pressure chamber 20, which also can be operated by a push button 42, which acts as a stopper when the desired extension of the tie rod 1 is reached. The cover 36 is brought into contact with and pushed downward from the cover. This enables self control and high stability is achieved.

The traction device 5 allows for quick assembly and disassembly due to the multi-piece form of the piston device and the cylinder device. When assembling, the support 10 is first placed. Then mount the lower cylinder part 8 thereon. The lower cylinder portion can be adapted to the rectangular cross-sectional structure of the support 10 at its lower end and is inserted into the support 10 and has a nose 43 that interlocks with the edge inside the upper end. The lower piston 6 is then assembled and the threaded head 2 of the tie rod 1 is tightened until the lower pressure chamber 19 reaches the stop position where the minimum volume condition is reached. Then, the rotation fixing part 24 is coupled.

The upper cylinder part 9 is then placed on the lower cylinder part 8 without the cover 36. At this time, the ring functioning as the insertion device 30 automatically moves the connecting pin 29 to the blocking position, whereby the lower and upper cylinders 8 and 9 are coupled. Then mount the upper piston 7 and tighten it onto the screw pin 14 until it reaches the stop position.

The individual parts of the piston device and the cylinder device are light in weight and relatively short in axial length, which allows for simple operation and easy assembly even in tight space conditions. In addition, strong forces are generated due to the pressure chambers 19 and 20 arranged in series, and due to the relatively large cross-sectional area of the upper pressure chamber 20, only two pistons 6 and 7 can function sufficiently. .

The present invention not only achieves a high tensile force, but also can realize a thin and compact structure, and the device of the type described above is simple and inexpensive so that excellent assembly is ensured.

Claims (17)

A device for elongation of a tie rod 1 for receiving a nut 3, A plurality of pistons 6, 7 arranged in series comprising a piston head 16 connected to one shaft 15, a piston device coupled with the tie rod 1, and the corresponding pistons 6, 7. The piston heads 16 are respectively wrapped at the bottom to thereby define pressure chambers 19 and 20 which are filled with pressurized medium, and have a collar 18 projecting inward in the radial direction, the pistons 6 and 7 A plurality of cylinders 8, 9 arranged in series to receive the support, and a support 10 formed with a through-window 11 for inserting a tool that can tighten the nut 3 while surrounding the nut 3. In the tie rod (1) which includes a cylinder arrangement, in particular applied to a cylinder of a large engine, The pistons 6 and 7 arranged in series and the lowermost piston 6 are coupled to each other in a form that is detachable from the tie rod 1 by one central bolt, and the lower portion of the lowermost piston 6 A coaxial screw hole which has a screw hole 13 engaged with the tie rod 1, and which engages with a screw pin protruding from the piston 6 present at its lower end under the other piston 7 13), characterized in that the cylinder portion (8, 9) arranged in series are coupled in a form that can be separated from each other by a moving device (27) capable of insertion and removal. 2. A tie rod stretching device according to claim 1, wherein said piston device has two said pistons (6, 7) and said cylinder device has two said cylinder parts (8, 9). 3. A tie rod stretching device according to claim 1 or 2, characterized in that the collar (18) of the upper cylinder portion (9) is wider than the collar (18) of the lowermost cylinder portion (8). The tie rod according to any one of claims 1 to 3, characterized in that the outer diameter of the piston head (16) of the piston (6, 7) is the same in the sections of the corresponding pressure chambers (19, 20). Stretching device. 5. The lower edge of the piston head 16 of the lowermost piston 6 is lower than the upper end of the tie rod 1 inserted into the lowermost piston 6. A tie rod stretching device characterized in that. The tie rod according to any one of claims 1 to 5, wherein the diameter of the threaded pin (14) projecting upwardly from the lower piston (6) is smaller than the diameter of the tie rod (1). Stretching device. 7. A moving device (27) according to any one of the preceding claims, wherein the moving device (27) has at least one connecting pin (29) arranged in the radial hole (28) of each of the lower cylinder portions (8), The connecting pin is in contact with the lower cylinder portion 8 against the force of the return spring 31 by an insertion device 30 attached in a form operable in the upper cylinder portion 9. Tie rod stretching device, characterized in that inserted into the blind hole (32) of the neck (26). 8. The tie rod according to claim 7, wherein the insertion device (30) is formed as a ring surrounding the circumference, and the moving device (27) has a plurality of the connecting pins (29) uniformly distributed around the tie rod. Stretching device. 9. A tie rod stretching device according to claim 7 or 8, characterized in that the insertion device (30) has an inclined stop face (33). 10. The insertion device 30 according to any one of claims 7 to 9, wherein the insertion device 30 is arranged in an axially movable form, and is moved to the insertion position by its weight, and the respective connecting pins 29 are excited. Tie rod stretching device, characterized in that the weight is sufficient to move against the force of the return spring (31) in contact with. The upper cylinder portion (9) is equipped with a removable cover (36), and the cover has a return spring device (37) which cooperates with the uppermost piston (7). Tie rod stretching device characterized in that the support. 12. A pressure reducing valve (40) is mounted to the uppermost piston (7), the pressure reducing valve being at least one of which passes through a bore through the corresponding piston head (16). A tie rod stretching device, which is connected to the pressure chamber and is operated by a push button 42 which is pressed downward from a corresponding stopper at start-up. 13. The tie rod stretching device according to claim 11 or 12, wherein the cover (36) is configured to act as a stopper of the push button (42). 14. A connection nipple (23) for pressurized medium supply pipe, according to any one of the preceding claims, connected to the respective pressure chambers (19, 20) by a bore system (22). Tie rod stretching device characterized in that it is accommodated in). The tie rod stretching apparatus according to any one of claims 1 to 14, wherein the support portion (10) is formed as a rectangular frame. The tie rod stretching apparatus according to claim 15, wherein the lower cylinder portion (8) supported at least under the support portion (10) has a cross sectional structure corresponding to the cross sectional structure of the support portion (10). The tie according to any one of the preceding claims, characterized in that the lower cylinder portion (8) received on the support portion (10) has a nose (43) inserted into the support portion (10). Rod stretching device.