WO2014077789A1

WO2014077789A1 - A locking mechanism for telescopic booms

Info

Publication number: WO2014077789A1
Application number: PCT/TR2013/000336
Authority: WO
Inventors: Memiş KÜTÜKÇÜ
Original assignee: Hi̇drokon Konya Hi̇droli̇k Maki̇na Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇
Priority date: 2012-11-13
Filing date: 2013-11-04
Publication date: 2014-05-22

Abstract

The present invention is related to a locking mechanism enabling telescopic booms [1, 2, 3, 4, 5, 6] to be fixed to each other and to the extension cylinder [8] and to be released from said cylinder in a secured manner during the back and forth motion of telescopic booms and when they are not in use in the telescopic boom crane systems.

Description

DESCRIPTION

A LOCKING MECHANISM FOR TELESCOPIC BOOMS TECHNICAL FIELD

The present invention is related to a locking mechanism enabling telescopic booms to be fixed to each other and to extension cylinder and to be released from the cylinder in a secured manner during the back and forth motion of telescopic booms and when they are not in use in the telescopic boom crane systems.

PRIOR ART

The telescopic booms used in crane systems are required to be fixed in their current positions when they are in use and out of use. Telescopic booms remain in telescoped manner while the crane is moving. During the motion of the crane in traffic, it is highly important to prevent the booms from being opened in terms of security. Furthermore, in the case that booms are opened at certain lengths and orders, they are required to be fixed in their current positions. Different locking methods are used for fixing the booms to each other. However, the locking mechanisms used generally have lower resistance and the locks become unusable because of deformation in time.

The locks enabling the telescopic booms to be interlocked and fixed penetrate into lock housings and are removed from said housings thanks to different mechanisms used. However, said mechanisms are subject to bending and fractures in time because of high pressure applied on the locking points of booms and they become unusable. Thus, the locking system is not activated and the booms cannot be fixed at their current positions and cannot be released from there in a secured manner. In addition, the mechanisms enabling the locks to penetrate into their housings and to be removed therefrom run on by being attached to the crane system. In case that the energy arriving to said mechanisms is cut, the locks cannot be removed from the housings manually and the booms cannot be released from their current positions. BRIEF DESCRIPTION OF THE INVENTION

The locking mechanism according to the present invention has been developed by our experts in order for the booms in mobile cranes to be extended telescopically and to be withdrawn and for the telescopic booms to be interlocked. Hydraulic cylinders, lever mechanisms driven by said cylinders and auxiliary mechanisms attached thereof are included in the locking mechanism developed. Under normal conditions, telescopic booms are interlocked via locking pins. While lifting load via mobile crane, all telescopic booms are again required to be in locked position. Said locking pins are supposed to be released from the locked position in order for telescopic booms to be extended or withdrawn. The telescopic booms passing from locked position to the released position are fixed to the extension cylinder and can be extended to the desired position from their current positions or be withdrawn therefrom by means of cylinder. The telescopic booms reaching the desired position are released from extension cylinders and are fixed by being interlocked again. Thanks to the locking mechanism according to the present invention, telescopic booms are both interlocked and fixed on the extension cylinder. Furthermore, the locking pins used in the locking mechanism developed enter into lock housings and are removed from housings in an hydraulic manner, and locking pins have been developed so as to enable the locking pins to be released from the housings manually in case of any malfunction that may occur in the mechanism.

DESCRIPTION OF THE FIGURES

Figure 1. The overall view of telescopic booms

Figure 2. The sectional view of telescopic booms

Figure 3. The overall view of locking mechanism

Figure 4. The sectional view of telescopic booms with locking mechanism

Figure 5(a). The sectional view of lock pin in the boom lock housing Figure 5(b). The sectional view of lock pin removed from boom lock housing Figure 6. The sectional inner detail view of telescopic booms

Figure 7(a). The sectional view of extension cylinder locked to the boom

Figure 7(b). The sectional view of the extension cylinder released from the boom

Figure 8(a). The view of the locking mechanism while the pin holders are inside

Figure 8(b). The view of the locking mechanism while the pin holders are outside

Figure 9. The bottom view of the pin holder of locking mechanism

Figure 10(a). The bottom view of the locking mechanism while the pin holders are outside

Figure 10(b). The bottom view of the locking mechanism while the pin holders are inside

Figure 1 1 (a). The sectional view of the pin holder of locking mechanism

Figure 1 1 (b). The sectional view of the pin holder of locking mechanism

Figure 12(a). The sectional view of the locking mechanism while the pin holders are outside

Figure 12(b). The sectional view of the locking mechanism while the pin holders are inside

The equivalents of part numerals indicated in the figures are given below.

1 . Main boom body

2. The telescopic boom body

3. The telescopic boom body

4. The telescopic boom body

5. The telescopic boom body

6. The telescopic boom body

7. Hydraulic cylinder head

8. Hydraulic extension cylinder 9. Centering pipe

10. Centering pipe

11. Centering pipe

12. Centering pipe

13. Centering pipe

14. Locking pin

5. Locking pin

16. Locking pin

17. Locking pin

18. Locking pin

9. Pin holder

20. Cylindrical lock pin head

21. Locking pin center shaft

22. Lubrication nipple

23. Bearing lid

24. Lock housing plate

25. Cylindrical rotation preventer

26. Stay bolt

27. Spring

28. Lock housing plate

29. Lock housing plate

30. Lock housing plate

31. Lock housing plate

32. Lock housing plate

33. Extension cylinder upper bearing member

34. Extension cylinder upper bearing member

35. Extension cylinder upper bearing member

36. Extension cylinder upper bearing member

37. Extension cylinder upper bearing member

38. Extension cylinder lower bearing member

39. Extension cylinder lower bearing member

40. Extension cylinder lower bearing member 41. Extension cylinder lower bearing member

42. Extension cylinder lower bearing member

43. Hydraulic cylinder

44. Hydraulic cylinder rod

45. Connection pin

46. Bend

47. Connection pin

48. Lever

49. Locking pin

50. Intermediate Lever

51. Connection pin

52. Connection pin

53. Mobile transfer head

54. Connection pin

55. Hydraulic cylinder

56. Hydraulic cylinder rod

57. Hydraulic oil inlet

58. Connection pin

59. Main lever

60. Connection pin

61. Connection pin

62. Connection pin

63. Connection plate

64. Connection body

65. Pin holder connection plate

66. Pin holder connection plate

67. Cylinder locking pin bearing

DETAILED DESCRIPTION OF THE INVENTION

The present invention is related to locking mechanism for telescopic booms, which enables the booms (1 , 2, 3, 4, 5, 6) to be interconnected by controlling the motion of locking pins (14, 15, 16, 17, 18) centered via centering pipes (9, 10, 1 1 , 12, 13) provided on main boom (1 ) and telescopic booms (2, 3, 4, 5, 6) positioned therein, between the booms (1 , 2, 3, 4, 5, 6), enables the booms (1 , 2, 3, 4, 5, 6) to be locked to the hydraulic extension cylinder (8) for back and forth motion, and is located on the hydraulic cylinder head (7).

Telescopic booms (2, 3, 4, 5, 6) to be used for lifting load on the crane are located inside the main boom (1 ). Housings that provide the telescopic booms (2, 3, 4, 5, 6) to be extended and withdrawn as much as 50%, 90% and 100% of their own lengths are provided on the main boom (1 ) and telescopic booms (2, 3, 4, 5, 6). The locking pins (14, 15, 16, 17, 18) enable the booms (1 , 2, 3, 4, 5) to be interconnected at predetermined points by means of centering pipes (9, 10, 1 1 , 12, 13) located on said housings. The locking pins (14, 15, 16, 17, 18) are removed from lock housings and located into the housings by means of locking mechanism located onto the hydraulic cylinder head (7) provided on hydraulic extension cylinder (8). Moreover, back and forth motion is enabled by fixing the booms (1 , 2, 3, 4, 5, 6) to hydraulic extension cylinder (8) via locking mechanism located again onto the hydraulic cylinder head, and by means of extension cylinder (8). Each telescopic boom (2, 3, 4, 5, 6) comprises locking pin (14, 15, 16, 17, 18) that enables to be locked to the former boom thereon.

Cylindrical pin head (20) provided on each locking pin (14, 15, 16, 17, 18) is hold by means of pin holders (19) included in the locking mechanism according to the present invention, which is located on the hydraulic cylinder head (7) connected to hydraulic extension cylinder (8), and is pulled towards to the center and motion is given to the locking pins (14, 15, 16, 17, 18). Said motion is driven by single-acting hydraulic cylinder (55) provided on the locking mechanism. The motion received from the hydraulic cylinder (55) is transferred to the main lever (59) by means of hydraulic cylinder rod (56). The connection between the main lever (59) and hydraulic cylinder rod (56) is provided by connection pin (58). Hydraulic oil inlet (57) is also provided on the hydraulic cylinder (55). The motion transferred to the main lever (59) is transmitted to the connection levers (60) by means of connection pins (62) provided at the end of main lever (59) and from here, is transmitted to the connection plates (65, 66) to which pin holders (19) are connected, by means of connection pins (61 ). At the point where the telescopic booms (2, 3, 4, 5, 6) are desired to be locked to a former boom, hydraulic cylinder (55) located on the extension cylinder (8) gives motion to the rod (56) in the direction + shown in Figure 1 1 (a), and enables the pin holders (19) clutching the cylindrical pin head (20) to be pulled towards center (in the direction b in Figure 10(a)) and the locking pins (14, 15, 16, 17, 18) to be removed from the lock housings. Thus, locking between the booms (1 , 2, 3, 4, 5, 6) is eliminated and telescopic booms (2, 3, 4, 5, 6) can move backwards and forwards. Then, hydraulic cylinder (55) moves in the direction - shown in Figure 1 1 (a) in order for the telescopic booms (2, 3, 4, 5, 6) to be locked again to a former boom, and outward motion (in the direction a in Figure 10(a)) of pin holders (19) is realized and locking pins (14, 15, 16, 17, 18) are enabled to penetrate into lock housings again. Thus, telescopic booms (2, 3, 4, 5, 6) are allowed to be locked to a former boom.

Locking is performed by means of locking pins (14, 15, 16, 17, 18) between the booms (1 , 2, 3, 4, 5, 6) in the locking mechanism according to the present invention. Centering each one of the locking pin (14, 15, 16, 17, 18) is achieved by means of centering pipes (9, 0, 1 1 , 12, 13). In addition, a center shaft (21 ) connected to each one of locking pins (14, 15, 16, 17, 18) and cylindrical pin head (20) connected to said shaft (21 ) and to be grasped by the pin holders (19) are provided. Again, lubrication nipple (22) is provided for each one of locking pin (14, 15, 16, 17, 18) in order to perform lubrication. Moreover, cylindrical rotation preventer (25) is also used in order to enable the locking pins (14, 15, 16, 17, 18) to perform only linear motion, and to prevent them from rotating around their own axes in the centering pipe (9, 10, 1 1 , 12, 13). Again, a stay bolt (26) is located between the cylindrical locking pin head (20) and center shaft (21 ) in order to prevent said members from unfastening in time. The center shaft (21 ) is embedded by means of a bearing lid (23) closing the inner section of centering pipes (9, 10, 1 , 12, 13). The spring (27) attached by performing preloading in the mechanism applies pressure on locking pins (14, 15, 16, 17, 18) constantly. Thus, the locking pins (14, 15, 16, 17, 18) remain in locked position constantly. Said spring (27) is stretched in the locking pins (14, 15, 16, 17, 18) pulled towards the center via pin holders (19) and when the pin holders (19) move outwards, the locking pins (14, 15, 16, 17, 18) again perform locking thanks to spring (27). The locking pins (14, 15, 16, 17, 18) are removed from the lock housings manually in case of any malfunction by means of groove-sets provided between the locking pins (14, 15, 16, 17, 18) and center shaft (21 ). The center shaft (21 ) is rotated from its end via an appropriate wrench and the locking pins (14, 15, 16, 17, 18) are enabled to move towards the center and the pins (14, 15, 16, 17, 18) are removed from lock housings. While the view of locking pin (18) locked to a former boom is given in Figure 5(a), the view of locking pin (18) removed from boom lock housing is given in Figure 5(b).

Moreover, telescopic booms (2, 3, 4, 5, 6) are fixed onto the extension cylinder (8) by means of the locking mechanism according to the present invention. When the interlocking of telescopic booms (2, 3, 4, 5, 6) is eliminated, the booms (2, 3, 4, 5, 6) are fixed to the extension cylinder (8) again by means of locking mechanism according to the present invention and back and forth motion of booms (2, 3, 4, 5, 6) is provided by means of extension cylinder (8). The motion is transferred to the lever (48) by means of hydraulic cylinder rod (44) thanks to driving the hydraulic cylinder (43) included in the locking mechanism and connected to the mechanism through the connection point (54). The connection of lever (48) with hydraulic cylinder rod (44) is provided by means of connection pins (45, 47) and the bend (46). The lever (48) transfers the motion it receives from the hydraulic cylinder (43) by pulling the cylinder rod (44) towards center, to the locking pin (49) via intermediate lever (50), connection pins (51 , 52) and mobile transfer head (53). Telescopic booms (2, 3, 4, 5, 6) are fixed to the extension cylinder (8) thanks to the fact that locking pin (49) is fit to the lock housing plates (28, 29, 30, 31 , 32) provided on the telescopic booms (2, 3, 4, 5, 6). Thus, back and forth motion of booms (2, 3, 4, 5, 6) is provided by means of extension cylinder (8). When telescopic booms (2, 3, 4, 5, 6) are desired to be released from the extension cylinder (8), hydraulic cylinder (43) pushes the cylinder rod (44) outwards and the lever (48) pulls the locking pin (49) inwards. Thus, the locking pin (49) is released from lock housing plates (28, 29, 30, 31 , 32) and locking is eliminated. Bearing the locking pin is performed by means of cylinder locking pin bearing (67). Figure 7(a) shows the locking pin (49) locked to the lock housing plate (32) provided on the telescopic boom (6). However, Figure 7(b) shows that the locking pin (49) is removed from the lock housing plate (32) and locking is eliminated.

In order for the locking mechanism according to the present invention to function properly, centering and bearing of the hydraulic extension cylinder (8) are required to be performed properly. Bearing of the extension cylinder (8) both vertically and horizontally is performed by means of upper bearing members (33, 34, 35, 36, 37) and extension cylinder lower bearing members (38, 39, 40, 41 , 42) provided at the inner sections of telescopic booms (2, 3, 4, 5, 6).

Claims

1. Locking mechanism for telescopic booms, characterized in that it comprises locking mechanism which enables the booms (1 , 2, 3, 4, 5, 6) to be interconnected by controlling the motion of locking pins (14, 15, 16, 17, 18) centered via centering pipes (9, 10, 1 1 , 12, 13) provided on main boom (1) and telescopic booms (2, 3, 4, 5, 6) positioned therein, between the booms (1 , 2, 3, 4, 5, 6), enables the booms (1 , 2, 3, 4, 5, 6) to be locked to the hydraulic extension cylinder (8) for back and forth motion, and is located on the hydraulic cylinder head (7).

2. Locking mechanism according to Claim 1 , characterized in that said locking mechanism comprises locking pins (14, 15, 16, 17, 18) centered by means of centering pipes (9, 10, 1 1 , 12, 13) provided on telescopic booms (2, 3, 4, 5, 6).

3. Locking mechanism according to Claim 1 , characterized in that said locking pins (14, 15, 16, 17, 18) comprise cylindrical lock pin head (20), center shaft (21 ), lubrication nipple (22), bearing lid (23), cylindrical rotation preventer (25), stay bolt (26) and spring (27).

4. Locking mechanism according to Claim 1 , characterized in that said locking mechanism comprises hydraulic cylinder (55), hydraulic cylinder rod (56), hydraulic oil inlet (57), connection pin (58), main lever (59), connection levers (60), connection pins (61 , 62), pin holders (19) and connection plates (65, 66).

5. Locking mechanism according to Claim 1 , characterized in that said locking mechanism comprises hydraulic cylinder (43), hydraulic cylinder rod (44), connection pins (45, 47), bend (46), lever (48), locking pin (49), intermediate lever (50), connection pins (51 , 52), mobile transfer head (53) and cylinder locking pin bearing (67).

6. Locking mechanism according to Claim 1 , characterized in that said locking pins (14, 15, 16, 17, 18) comprise groove-sets enabling the locking pins to be removed from the lock housings manually in case any malfunction and provided between the locking pins (14, 15,, 17, 18) and center shaft (21 ).