Three-section movable supporting leg telescopic system

Abstract

The utility model discloses a three-section movable supporting leg telescopic system which comprises a fixed supporting leg, three sections of movable supporting legs arranged in the fixed supporting leg in a sleeved mode and a horizontal telescopic cylinder pushing the first section of movable supporting leg to stretch out or retract back. The tail end of the second section of movable supporting leg is connected with the fixed supporting leg and the horizontal telescopic cylinder through a first rope row mechanism and is driven by the horizontal telescopic cylinder to extend out; the tail end of the third section of movable supporting leg is connected with the front ends of the first section of movable supporting leg and the second section of movable supporting leg through a second rope row mechanism and is driven by the second section of movable supporting leg to extend out; the tail end of the third section of movable supporting leg is connected with the rear end of the first supporting leg and the front end of the fixed supporting leg through a third rope row mechanism and is driven by the first section of movable supporting leg to retract; and the second section of movable supporting leg is driven by the third section of movable supporting leg to retract through a second rope row mechanism. When the whole body stretches out, the second rope row mechanism drives the third section of movable supporting leg to stretch out, when the whole body retracts, the third section of movable supporting leg drives the second rope row mechanism to retract, the structure is dual-purpose, and the rope row structure is simplified.

Description

Technical Field

[0001] The utility model relates to an outrigger system, in particular to a three-section movable outrigger telescopic system. Background Art

[0002] Mobile cranes are generally equipped with four movable outriggers. During lifting operations, the four outriggers extend to support the entire crane and bear the entire weight of the crane during lifting operations. As the tonnage of the wheeled crane increases, the outrigger span requirement to meet the stability of the entire vehicle also increases. In order to improve the stability of the crane during lifting, the outrigger span needs to be increased as much as possible, which requires increasing the unfolded length of the movable outriggers when in use. However, due to the restrictions of transfer, the length of the movable outriggers themselves cannot be increased indefinitely.

[0003] In the prior art, the utility model patent with publication number CN217921202U discloses a multi-section boom synchronous telescopic mechanism and a crane, and the invention patent with publication number CN118083815A discloses a lifting arm, a six-section telescopic arm and a crane, which adopts a rope row and a section arm matching scheme. The non-working mechanism is retracted and the volume is reduced to meet the transfer requirements, and the working mechanism is extended to meet the span requirements. However, CN217921202U has multiple sets of fixed pulleys and movable pulleys wound back and forth, which is complex in structure. The rope row of A is distributed at various parts of the telescopic arm, the load of the telescopic arm / section arm itself increases, and the height of the telescopic arm decreases; the utility model patent with publication number CN220056136U discloses a telescopic mechanism of a single-cylinder multi-section arm and a telescopic arm crane including the same, although the rope row configuration method is simplified, there is still the problem of reduced section arm height, and the rope row is located inside the section arm, occupying most of the space in the lower middle part of the fixed leg shape. The rope row moves with the extension and retraction of the legs all the time, and it is extremely difficult to arrange the pipes or wire harnesses connecting the vertical telescopic cylinder inside the fixed leg type. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a three-section movable leg telescopic system with a simplified structure.

[0005] Technical solution: The utility model describes a three-section movable leg telescopic system, comprising a fixed leg, a three-section movable leg sleeved in the fixed leg, and a horizontal telescopic cylinder for pushing the first section of the movable leg to extend or retract; the tail end of the second section of the movable leg is connected to the fixed leg and the horizontal telescopic cylinder through a first rope row mechanism, and is driven to extend by the horizontal telescopic cylinder; the tail end of the third section of the movable leg is connected to the first section of the movable leg and the front end of the second section of the movable leg through a second rope row mechanism, and is driven to extend by the second section of the movable leg; the tail end of the third section of the movable leg is connected to the rear end of the first leg and the front end of the fixed leg through a third rope row mechanism, and is driven to retract by the first section of the movable leg; the second section of the movable leg is retracted by the third section of the movable leg through the second rope row mechanism.

[0006] In the utility model, the connection structure is simplified. The second rope arrangement structure is used to drive the third section of the movable leg to extend when the three sections of the movable leg are extended, and is used to drive the second section of the movable leg to retract when the three sections of the movable leg are retracted. One structure realizes two functions, and the rope arrangement structure is simplified.

[0007] Preferably, the first rope row mechanism includes a first rope row and a first movable pulley, the first movable pulley is directly arranged at the front end of the horizontal telescopic cylinder barrel, one end of the first rope row is connected to the middle part of the inner side of the fixed leg, and the other end bypasses the first movable pulley and is connected to the tail end of the second movable leg. The horizontal telescopic cylinder barrel directly drives the first movable pulley to extend, and then drives the second movable leg to extend through the rope row.

[0008] Preferably, the first rope row mechanism includes a first rope row and a first movable pulley, wherein the first movable pulley is arranged at the outer wall of the front end of the first movable leg, and is connected to the cylinder barrel of the horizontal telescopic cylinder through the first movable leg, and one end of the first rope row is connected to the outer wall of the front end of the fixed leg, and the other end bypasses the first movable pulley and is connected to the tail end of the second movable leg. When the horizontal telescopic cylinder drives the first movable leg to extend, it drives the first movable pulley arranged at the front end of the first movable leg to extend, and then drives the second movable leg to extend through the first rope row. Arranging the first movable pulley at the front end of the first movable leg not only shortens the amount of rope row, but also reduces the installation space required for extending the pulley, effectively ensuring the height / width of the movable leg and the bearing capacity of the movable leg.

[0009] Preferably, the second rope row mechanism includes a second rope row and a second movable pulley, the second movable pulley is arranged on the front end outer wall of the second movable leg, one end of the second rope row is connected to the front end outer wall of the first movable leg, and the other end passes around the second movable pulley and is connected to the tail end of the third movable leg.

[0010] Preferably, the third rope row mechanism comprises a third rope row, a fixed pulley and a third movable pulley, one end of the third rope row is connected to the tail end of the third movable leg, and the other end is connected to the tail end of the first movable leg by passing through the third movable pulley and the fixed pulley in sequence. When the three movable legs are retracted, the horizontal telescopic cylinder drives the first movable leg to retract, and drives the third movable leg to retract through the third movable pulley. At the same time, the second rope row mechanism is transformed from a mechanism for driving the third movable leg to extend to a mechanism for driving the second movable leg to retract, and drives the second movable leg to retract. Thus, the three movable legs are retracted simultaneously through the rope row mechanism and the horizontal telescopic rod.

[0011] Preferably, the top cover plate of the fixed leg is inclined and provided with a process hole, one end of the third rope row is connected to the tail end of the third movable leg, and the other end passes around the third movable pulley, passes through the process hole, passes around the fixed pulley and is connected to the tail end of the first movable leg.

[0012] Preferably, the second rope row mechanism and the third rope row mechanism are arranged on opposite sides of the telescopic legs to increase stability.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. Simplified structure: on the basis of the traditional oil cylinder telescopic system, only one rope-row mechanism is added to realize the synchronous telescopic of three-section movable legs; 2. Improved bearing capacity: the rope-row mechanism is partially arranged on the outside of the movable legs, and the space between the side walls of the movable legs is fully utilized to maximize the height of the movable legs, improve the bearing capacity, and reduce the amount of rope-rows; 3. Light weight and low cost; 4. High reliability of pipelines / wiring harnesses inside the legs: the telescopic system maximizes the layout space of pipelines / wiring harnesses inside the leg box type, and improves the reliability of pipelines / wiring harnesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the fixed leg structure of the first embodiment of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the fixed supporting leg to the two-section movable supporting leg in the first embodiment of the utility model;

[0017] Figure 4 It is a partial structural schematic diagram of the first embodiment of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the second embodiment of the utility model. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0020] Example 1: Figure 1 As shown, the telescopic legs are mainly composed of: a fixed leg 1, a horizontal telescopic cylinder 2, a first section of a movable leg 3, a second section of a movable leg 4, a third section of a movable leg 5, a vertical telescopic cylinder 6, a first rope arrangement mechanism 7, a third rope arrangement mechanism 8, and a second rope arrangement mechanism 9.

[0021] like Figure 2 As shown, the fixed leg body 11 is a box-type structure with one end open. The lower lap block 13 at the bottom of the box and the door panel 14 at the top of the box are the bearing parts of the fixed leg 1. The inner cover plate 15 at the top of the box is tilted downward at a certain angle to facilitate the extension and retraction of the movable leg. The side wall of the fixed leg body 11 is installed with a horizontal telescopic cylinder seat 12 for connecting the piston rod of the horizontal telescopic cylinder 2.

[0022] With the extending direction of the movable leg as the front / head end, the tail end of the cylinder barrel of the horizontal telescopic cylinder 2 is connected to the tail end of the first section of the movable leg 3, so as to push the first section of the movable leg 3 to extend or retract. Correspondingly, a horizontal telescopic cylinder seat (existing technology, not shown) is arranged at the tail of the first section of the movable leg 3, so as to fix the cylinder barrel part of the horizontal telescopic cylinder 2.

[0023] like Figure 3 As shown, the first rope row mechanism 7 includes a first rope row 71 and a first movable pulley 72. The first movable pulley 72 is fixed to the front end of the cylinder barrel of the horizontal telescopic cylinder 2 and has a plurality of pulley grooves. One end of the first rope row 71 is fixed to the middle part of the inner side of the fixed leg 1, and the other end passes through the middle pulley groove of the first movable pulley 72 and is fixed to the tail of the second movable leg 4. The function of the first rope row mechanism 7 is to drive the extension of the second movable leg 4 through the extension of the horizontal telescopic cylinder 2.

[0024] like Figure 4As shown, the third rope row mechanism 8 includes a third rope row 81, a fixed pulley 82 and a third movable pulley 83. The fixed pulley 82 is embedded in the inner cover plate 15 of the fixed leg 1, and the third movable pulley 83 is fixed to the tail of the first movable leg 3. One end of the third rope row 81 is fixed to the cover plate / joint plate at the tail of the first movable leg 3, and the other end bypasses the third movable pulley 83, passes through the process hole set above the inner cover plate 15, bypasses the fixed pulley 82, and is finally fixed to the tail joint plate of the first movable leg 3, so as to make full use of the gap between the upper part of the lap plate of the first movable leg 3 and the lower part of the inner cover plate 15 of the fixed leg 1, and ensure the box-shaped height of the first movable leg 3. The function of the rope row mechanism 8 is that the first movable leg 3 retracts inwards under the drive of the retraction of the horizontal telescopic cylinder 2, thereby driving the third movable leg 5 to retract inwards. During retraction, if the first movable leg 3 is retracted to a length of L relative to the fixed leg 1, the third movable leg 5 is retracted to a length of 3L relative to the fixed leg 1. The movable pulley 83 is designed so that when the first movable leg 3 is retracted to a length of L, the third movable leg 5 is retracted to a length of 2L relative to the first movable leg 3. At the same time, due to the provision of the movable pulley 83, the inward retraction speed of the third movable leg 5 is 3 times the retraction speed of the horizontal telescopic cylinder 2.

[0025] The second rope row mechanism 9 includes a second rope row 91 and a second movable pulley 92. The second movable pulley 92 is embedded in the bottom plate outside the front end of the second movable leg 4. One end of the second rope row 91 is fixedly connected to the lower bottom plate outside the front end of the first movable leg 3, and the other end passes around the second movable pulley 92 and connects to the lower overlap block at the tail end of the third movable leg 5, making full use of the gap between the side wall of the second movable leg 4 and the side wall of the third movable leg 5 to ensure the height of the third movable leg 5. The function of the second rope row mechanism 9 is to drive the third movable leg 5 to extend through the second movable leg 4 during the leg extension process; and to drive the second movable leg 4 to retract through the third movable leg 5 during the leg retraction process.

[0026] The process and principle of extending the telescopic legs are as follows:

[0027] (1) Full extension process: First, the horizontal telescopic cylinder 2 extends outward, driving the first movable leg 3 to extend, and the first movable pulley 72 of the first rope mechanism 7 follows the cylinder barrel of the horizontal telescopic cylinder 2 to drive the second movable leg 4 to extend outward, thereby the second movable pulley 92 and the second rope row 91 fixed on the second movable leg 4 drive the third movable leg 5 to extend, and the third movable leg 5 is synchronously extended until it is in a fully extended state, reaching the maximum lateral span.

[0028] (2) Full retraction process: When the horizontal telescopic cylinder 2 retracts, it drives the first movable leg 3 to retract. When the first movable leg 3 retracts to a length of L relative to the fixed leg 1, the third movable leg 5 retracts to a length of 2 times L relative to the first movable leg 3. The first movable leg 3 drives the third movable leg 5 to retract through the third rope arrangement mechanism 8 and adjusts the retraction speed of the three movable legs 5. The three movable legs 5 drive the second movable leg 4 to retract through the second rope arrangement mechanism 9 fixed at the tail end of the third movable leg 5. The third movable pulley 92 drives the second movable leg 4 to retract to a length of L relative to the first movable leg 3. The three movable legs retract synchronously until the door panel of the first movable leg 3 contacts the door panel of the fixed leg 1. The three movable legs are all in a fully retracted state, and the overall width of the movable legs does not exceed the outermost end of the vehicle.

[0029] Embodiment 2: Based on Embodiment 1, this embodiment may also have the following variations:

[0030] The first rope arrangement mechanism 7 is arranged similarly to the second rope arrangement mechanism 9. Figure 5 As shown, the first movable pulley 72 is fixed on the bottom plate outside the first movable leg 3, one end of the first rope row 71 is fixed on the fixed leg 1, and the other end passes around the first movable pulley 72 and is fixed on the lap plate at the tail end of the second movable leg 4.

Claims

1. A three-section movable leg telescopic system, characterized in that: The invention comprises a fixed leg (1), three movable legs sleeved in the fixed leg, and a horizontal telescopic cylinder (2) for pushing the first movable leg (3) to extend or retract; the tail end of the second movable leg (4) is connected to the fixed leg (1) and the horizontal telescopic cylinder (2) through a first rope arrangement mechanism (7), and is driven to extend by the horizontal telescopic cylinder (2); the tail end of the third movable leg (5) is connected to the first movable leg (3) and the front end of the second movable leg (4) through a second rope arrangement mechanism (9), and is driven to extend by the second movable leg (4); the tail end of the third movable leg (5) is connected to the rear end of the first leg (3) and the front end of the fixed leg (1) through a third rope arrangement mechanism (8), and is driven to retract by the first movable leg (3); the second movable leg (4) is driven to retract by the third movable leg (5) through the second rope arrangement mechanism (9).

2. The three-section movable leg extension system according to claim 1 is characterized in that: The first rope row mechanism (7) comprises a first rope row (71) and a first movable pulley (72). The first movable pulley (72) is directly arranged at the front end of the cylinder barrel of the horizontal telescopic cylinder (2). One end of the first rope row (71) is connected to the middle part of the inner side of the fixed leg (1), and the other end passes around the first movable pulley (72) and is connected to the tail end of the second movable leg (4).

3. The three-section movable leg extension and retraction system according to claim 1 is characterized in that: The first rope row mechanism (7) comprises a first rope row (71) and a first movable pulley (72); the first movable pulley (72) is arranged on the front end outer wall of the first movable leg (3) and is connected to the cylinder barrel of the horizontal telescopic cylinder (2) through the first movable leg (3); one end of the first rope row (71) is connected to the front end outer wall of the fixed leg (1), and the other end passes around the first movable pulley (72) and is connected to the rear end of the second movable leg (4).

4. The three-section movable leg extension and retraction system according to claim 2 or 3, characterized in that: The second rope row mechanism (9) comprises a second rope row (91) and a second movable pulley (92); the second movable pulley (92) is arranged on the front end outer wall of the second movable leg (4); one end of the second rope row (91) is connected to the front end outer wall of the first movable leg (3), and the other end passes around the second movable pulley (92) and is connected to the rear end of the third movable leg (5).

5. The three-section movable leg telescopic system according to claim 2 or 3, characterized in that: The third rope row mechanism (8) comprises a third rope row (81), a fixed pulley (82) and a third movable pulley (83); one end of the third rope row (81) is connected to the tail end of the third movable leg (5), and the other end of the third rope row passes through the third movable pulley (83) and the fixed pulley (82) in sequence and is connected to the tail end of the first movable leg (3).

6. The three-section movable leg extension and retraction system according to claim 5 is characterized in that: The top cover plate (15) of the fixed leg (1) is inclined and provided with a process hole. One end of the third rope row (81) is connected to the tail end of the third movable leg (5), and the other end passes through the third movable pulley (83), passes through the process hole, passes through the fixed pulley (82), and is connected to the tail end of the first movable leg (3).

7. The three-section movable leg extension and retraction system according to claim 1 is characterized in that: The second rope arrangement mechanism (9) and the third rope arrangement mechanism (8) are arranged on opposite sides of the telescopic legs.

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