Straight-arm truck-mounted crane telescopic hydraulic cylinder capable of freely stretching out and drawing back

Abstract

The utility model provides a telescopic hydraulic cylinder of a freely telescopic straight-arm truck-mounted crane. The telescopic hydraulic cylinder comprises an outer cylinder barrel, an inner cylinder sleeve, a guide sleeve, a piston rod, a piston and a central shaft, the piston rod is arranged on an outer ring of the inner cylinder sleeve in a sleeved mode, the inner cylinder sleeve is arranged on an outer ring of the center shaft in a sleeved mode, the piston is arranged at one end of the piston rod and one end of the inner cylinder sleeve in a sleeved mode, the inner cylinder sleeve, the piston rod and the piston are all contained in the outer cylinder barrel, a center channel is formed in the center shaft, the center shaft penetrates through the piston, and the piston is arranged in the center channel. A gap between the piston rod and the inner cylinder sleeve serves as a rod cavity channel, a gap between the inner cylinder sleeve and the center shaft serves as a rodless cavity channel, the center channel, the rod cavity channel and the rodless cavity channel are in a separated state, and the rodless cavity channel is communicated with a rodless cavity channel of a next-stage telescopic hydraulic cylinder. And the central channel is communicated with the oil channel of the next stage of telescopic hydraulic cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a telescopic hydraulic cylinder of a straight-arm truck crane which can be freely telescopic. Background Art

[0002] As the core working element of the telescopic boom of a truck-mounted crane, the telescopic hydraulic cylinder plays a key role in lifting and loading, so the stability and reliability of the telescopic hydraulic cylinder are particularly important. At present, most telescopic cylinders of truck-mounted cranes are designed with sequential valves, which can realize the sequential extension and retraction of 2 or 3 telescopic cylinders, that is, first extend 1 cylinder, then extend 2 cylinders, and finally extend 3 cylinders. When retracting, first retract 3 cylinders, then retract 2 cylinders, and finally retract 1 cylinder. Sequential extension is suitable for heavy lifting, when 1 arm must be extended first and then the other telescopic arms, but when the user is lifting a lighter weight, it cannot be satisfied when he wants to extend 2 arms first.

[0003] In view of this, it is necessary to provide a novel freely retractable straight arm truck crane telescopic hydraulic cylinder to overcome the above-mentioned defects. Utility Model Content

[0004] The utility model aims to provide a telescopic hydraulic cylinder of a straight-arm truck crane which can be freely extended and retracted, and the oil supply mode can be freely selected so that the telescopic hydraulic cylinder or the hydraulic oil cylinder of the next level can complete the telescopic action successively, and the telescopic hydraulic cylinder can be freely and flexibly selected for use.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is implemented as follows: a freely retractable straight-arm truck crane telescopic hydraulic cylinder comprises an outer cylinder barrel, an inner cylinder sleeve, a guide sleeve, a piston rod, a piston and a center shaft; the piston rod is sleeved on the outer ring of the inner cylinder sleeve, the inner cylinder sleeve is sleeved on the outer ring of the center shaft, the piston sleeve is sleeved on one end of the piston rod and the inner cylinder sleeve, the inner cylinder sleeve, the piston rod and the piston are all accommodated in the outer cylinder barrel, a center channel is opened on the center shaft, and the center shaft passes through the piston, the gap between the piston rod and the inner cylinder sleeve serves as a rod cavity channel, and the gap between the inner cylinder sleeve and the center shaft serves as a rodless cavity channel, the center channel, the rod cavity channel and the rodless cavity channel are in a separated state, the rodless cavity channel is connected to the rodless cavity channel of the telescopic hydraulic cylinder of the next level, and the center channel is connected to the oil channel of the telescopic hydraulic cylinder of the next level.

[0006] Preferably, the inner wall of the outer cylinder is in contact with the outer ring of the piston, and the outer ring of the piston is provided with a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are distributed at intervals.

[0007] Preferably, the inner ring of the piston contacts the outer wall of the central shaft, and the inner ring of the piston is provided with a third sealing ring and a fourth sealing ring, and the third sealing ring and the fourth sealing ring are distributed at intervals.

[0008] Preferably, a rod chamber oil inlet, a rodless chamber oil inlet and a center oil inlet are provided at one end of the inner cylinder sleeve, the rod chamber oil inlet is connected to the rod chamber channel, the rodless chamber oil inlet is connected to the rodless chamber channel, and the center oil inlet is connected to the center channel.

[0009] Preferably, the outer ring sleeve of the inner cylinder sleeve is provided with a support sleeve.

[0010] Preferably, a connecting pipe is provided on the outer cylinder, and the connecting pipe is connected to the central channel.

[0011] Compared with the prior art, the beneficial effect lies in that when oil is supplied to the central channel, the hydraulic oil in the central channel flows into the telescopic hydraulic cylinder of the next level. When oil is first supplied to the hydraulic oil pipe of the next level through the central channel, the hydraulic cylinder of the next level completes the telescopic action first. The oil supply method can be freely selected so that the telescopic hydraulic cylinder or the hydraulic cylinder of the next level can complete the telescopic action successively, and can be freely and flexibly selected for use.

[0012] Other features and advantages of the utility model will be stated in the following description, and some will be apparent from the description, or can be understood through the implementation of the utility model. The features and advantages of the utility model can be realized and obtained by the elements and combinations specifically pointed out in the attached application scope. These and other features of the utility model will become more clearly understood according to the following description and the attached claims, or can be understood through the implementation of the embodiments described in the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 The utility model provides a cross-sectional view of a telescopic hydraulic cylinder of a freely telescopic straight-arm truck crane in a first state.

[0015] Figure 2 for Figure 1 A cross-sectional view of the second state of the telescopic hydraulic cylinder of the freely retractable straight-arm truck crane is shown.

[0016] Figure numerals: 1. outer cylinder; 11. connecting pipe; 2. inner cylinder sleeve; 21. rod chamber oil inlet; 22. rodless chamber oil inlet; 23. center oil inlet; 3. guide sleeve; 4. piston rod; 41. first sealing ring; 42. second sealing ring; 43. third sealing ring; 44. fourth sealing ring; 5. piston; 6. center axis; 61. center channel; 7. rod chamber channel; 8. rodless chamber channel; 9. support sleeve. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and beneficial technical effect of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the utility model, and are not intended to limit the utility model.

[0018] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of 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 constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] It should also be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be determined according to the specific circumstances.

[0020] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" refers to two or more, unless otherwise clearly and specifically defined.

[0021] See also Figure 1 to Figure 2The utility model provides a telescopic hydraulic cylinder of a straight-arm truck crane that can be freely extended and retracted, comprising an outer cylinder barrel 1, an inner cylinder sleeve 2, a guide sleeve 3, a piston rod 4, a piston 5 and a central shaft 6; the piston rod 4 is sleeved on the outer ring of the inner cylinder sleeve 2, the inner cylinder sleeve 2 is sleeved on the outer ring of the central shaft 6, the piston 5 is sleeved on one end of the piston rod 4 and the inner cylinder sleeve 2, the inner cylinder sleeve 2, the piston rod 4 and the piston 5 are all accommodated in the outer cylinder barrel 1, a central channel 61 is opened on the central shaft 6, and the central shaft 6 passes through the piston 5, the gap between the piston rod 4 and the inner cylinder sleeve 2 is used as a rod cavity channel 7, and the gap between the inner cylinder sleeve 2 and the central shaft 6 is used as a rodless cavity channel 8, the central channel 61, the rod cavity channel 7 and the rodless cavity channel 8 are in a separated state, the rodless cavity channel 8 is connected with the rodless cavity channel 8 of the telescopic hydraulic cylinder of the next stage, and the central channel 61 is connected with the oil channel of the telescopic hydraulic cylinder of the next stage.

[0022] In this way, when oil is supplied to the rodless chamber channel 8, the hydraulic oil flows into the rodless chamber 12 of the outer cylinder barrel 1 along the rodless chamber channel 8, and the hydraulic oil squeezes the inner cylinder sleeve 2, the piston rod 4 and the piston 5 to extend out of the outer cylinder barrel 1. When oil is supplied to the rod chamber channel 7, the hydraulic oil flows into the rod chamber 13 of the outer cylinder barrel 1 along the rod chamber channel 7, and the hydraulic oil squeezes the inner cylinder sleeve 2, the piston rod 4 and the piston 5 to shrink into the outer cylinder barrel 1.

[0023] Or when oil is supplied to the central channel 61, the hydraulic oil in the central channel 61 flows into the telescopic hydraulic cylinder of the next stage. When oil is first supplied to the hydraulic oil pipe of the next stage through the central channel 61, the hydraulic oil cylinder of the next stage completes the telescopic action first. In this way, the oil supply method can be freely selected to make the telescopic hydraulic cylinder or the hydraulic oil cylinder of the next stage complete the telescopic action successively, and the use can be freely and flexibly selected.

[0024] In a preferred embodiment, the inner wall of the outer cylinder 1 contacts the outer ring of the piston 5, and the outer ring of the piston 5 is provided with a first sealing ring 41 and a second sealing ring 42. The first sealing ring 41 and the second sealing ring 42 are distributed at intervals. The first sealing ring 41 and the second sealing ring 42 can make the inner wall of the outer cylinder 1 in close contact with the outer ring of the piston 5, thereby enhancing the sealing of the rodless chamber 13 of the outer cylinder 1.

[0025] In a preferred embodiment, the inner ring of the piston 5 contacts the outer wall of the central shaft 6, and the inner ring of the piston 5 is provided with a third sealing ring 43 and a fourth sealing ring 44, and the third sealing ring 43 and the fourth sealing ring 44 are distributed at intervals, and the third sealing ring 43 and the fourth sealing ring 44 can make the inner wall of the piston 5 in close contact with the outer ring of the central shaft 6.

[0026] In a preferred embodiment, one end of the inner cylinder sleeve 2 is provided with a rod chamber oil inlet 21, a rodless chamber oil inlet 22 and a center oil inlet 23. The rod chamber oil inlet 21 is connected to the rod chamber channel 7, the rodless chamber oil inlet 22 is connected to the rodless chamber channel 8, and the center oil inlet 23 is connected to the center channel 61, so as to facilitate separate oil supply.

[0027] In a preferred embodiment, the outer ring of the inner cylinder sleeve 2 is provided with a support sleeve 9, which can prevent the inner cylinder sleeve 2 and the center axis 6 from tilting during movement and ensure the concentricity of the inner cylinder sleeve 2 and the center axis 6 in the outer cylinder barrel 1.

[0028] In a preferred embodiment, a connecting pipe 11 is provided on the outer cylinder 1 , and the connecting pipe 11 is connected to the central channel 61 , so as to facilitate communication with the oil passage of the telescopic hydraulic cylinder of the next stage through the connecting pipe 11 .

[0029] During use, when oil is supplied to the rodless chamber channel 8, the hydraulic oil flows into the rodless chamber 12 of the outer cylinder barrel 1 along the rodless chamber channel 8, and the hydraulic oil squeezes the inner cylinder sleeve 2, the piston rod 4 and the piston 5 to extend out of the outer cylinder barrel 1; when oil is supplied to the rod chamber channel 7, the hydraulic oil flows into the rod chamber 13 of the outer cylinder barrel 1 along the rod chamber channel 7, and the hydraulic oil squeezes the inner cylinder sleeve 2, the piston rod 4 and the piston 5 to retract into the outer cylinder barrel 1.

[0030] Or when oil is supplied to the central channel 61, the hydraulic oil in the central channel 61 flows into the telescopic hydraulic cylinder of the next stage. When oil is first supplied to the hydraulic oil pipe of the next stage through the central channel 61, the hydraulic oil cylinder of the next stage completes the telescopic action first. In this way, the oil supply method can be freely selected to make the telescopic hydraulic cylinder or the hydraulic oil cylinder of the next stage complete the telescopic action successively, and the use can be freely and flexibly selected.

[0031] The present invention is not limited to what is described in the specification and implementation modes, and therefore, additional advantages and modifications can be easily realized by those familiar with the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A telescopic hydraulic cylinder for a freely retractable straight-arm truck crane, characterized in that: The invention comprises an outer cylinder (1), an inner cylinder sleeve (2), a guide sleeve (3), a piston rod (4), a piston (5) and a central shaft (6); the piston rod (4) is sleeved on the outer ring of the inner cylinder sleeve (2), the inner cylinder sleeve (2) is sleeved on the outer ring of the central shaft (6), the piston (5) is sleeved on one end of the piston rod (4) and the inner cylinder sleeve (2), the inner cylinder sleeve (2), the piston rod (4) and the piston (5) are all accommodated in the outer cylinder (1), and the central shaft (6) is provided with a central channel (61) ), and the central axis (6) passes through the piston (5), the gap between the piston rod (4) and the inner cylinder sleeve (2) serves as a rod chamber channel (7), and the gap between the inner cylinder sleeve (2) and the central axis (6) serves as a rodless chamber channel (8), the central channel (61), the rod chamber channel (7) and the rodless chamber channel (8) are in a separated state, the rodless chamber channel (8) is connected to the rodless chamber channel (8) of the telescopic hydraulic cylinder of the next stage, and the central channel (61) is connected to the oil channel of the telescopic hydraulic cylinder of the next stage.

2. The telescopic hydraulic cylinder of the freely retractable straight-arm truck crane according to claim 1, characterized in that: The inner wall of the outer cylinder (1) contacts the outer ring of the piston (5), and the outer ring of the piston (5) is provided with a first sealing ring (41) and a second sealing ring (42), and the first sealing ring (41) and the second sealing ring (42) are distributed at intervals.

3. The telescopic hydraulic cylinder of the freely retractable straight-arm truck crane according to claim 1, characterized in that: The inner ring of the piston (5) contacts the outer wall of the central shaft (6), and the inner ring of the piston (5) is provided with a third sealing ring (43) and a fourth sealing ring (44), and the third sealing ring (43) and the fourth sealing ring (44) are distributed at intervals.

4. The telescopic hydraulic cylinder of the freely telescopic straight-arm truck crane according to claim 1, characterized in that: One end of the inner cylinder sleeve (2) is provided with a rod chamber oil inlet (21), a rodless chamber oil inlet (22) and a central oil inlet (23); the rod chamber oil inlet (21) is connected to the rod chamber channel (7), the rodless chamber oil inlet (22) is connected to the rodless chamber channel (8), and the central oil inlet (23) is connected to the central channel (61).

5. The telescopic hydraulic cylinder of the freely telescopic straight-arm truck crane according to claim 1, characterized in that: The outer ring sleeve of the inner cylinder sleeve (2) is provided with a support sleeve (9).

6. The telescopic hydraulic cylinder of the freely telescopic straight-arm truck crane according to claim 1, characterized in that: The outer cylinder (1) is provided with a connecting pipe (11), and the connecting pipe (11) is connected to the central channel (61).

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