Reach stacker mechanical legs and lightweight reach stacker

Abstract

The present invention provides a reach crane mechanical leg and a lightweight reach crane, which relate to the technical field of port engineering machinery, and include a leg mounting frame having a leg fixing frame with a cavity structure connected to the front end of the reach crane frame; a lifting mechanism with one end connected to the leg mounting frame by utilizing the cavity structure of the leg fixing frame; a leg mechanism connected to the lifting mechanism and changing with the leg mounting frame at multiple angles; the present invention utilizes the reach crane mechanical leg connected to the front of the reach crane frame as the torque balance center of the reach crane, so that the torque balance center of the front wheel of the reach crane is moved forward to realize long-row lifting without counterweight or with less counterweight, and in addition, the reach crane mechanical leg can also be contracted in a semicircular arc and swing back and forth, shortening the duration of conventional support operations, so that the reach crane has the advantages of small dead weight and low operating energy consumption, greatly saving costs and having wide universality.

Description

Technical Field

[0001] The invention belongs to the technical field of port engineering machinery, and in particular relates to a reach stacker mechanical leg and a lightweight reach stacker. Background Art

[0002] At port terminals, railway freight stations, and logistics container yards, container reach stackers are often used as heavy-duty container loading and unloading equipment. Ordinary reach stackers have the function of lifting multiple rows of boxes in sequence. In order to meet the function of lifting multiple rows of boxes, a large-tonnage balancing counterweight is usually set at the rear of the frame. A general-purpose 45-ton reach stacker often needs to be equipped with a rear counterweight of about 18 tons to meet the operating requirements of the reach stacker with multiple rows or long forward reach. Therefore, the general-purpose 45-ton reach stacker has a deadweight of more than 70 tons and must be equipped with a high-power engine and its gearbox and drive axle. In addition, the equipment has a heavy deadweight, high manufacturing cost, and high operating fuel consumption.

[0003] In order to solve the conflicting problems between large outreach hoisting boxes and lightweight equipment in the technical field of this industry, domestic and foreign manufacturers have proposed a variety of technical solutions and products, including the reach loader technology with flat-supported front legs and the variable wheelbase reach loader patent. The former has a simple structure and low cost, but the support operation time of the front legs is long and the efficiency is low, so it has not been popularized; the latter has a good improvement effect, but the solution is more complicated and the cost is higher.

[0004] Therefore, the market in this industry needs a reach stacker with fast and flexible maneuverability, universal front reach lifting capacity, lightweight design and light power configuration. Summary of the invention

[0005] In order to solve the problems of existing reach cranes such as heavy deadweight, high operating fuel consumption, and supporting operation of front legs, the present invention provides a lightweight reach crane that requires no or less counterweight. The lightweight reach crane provided by the present invention utilizes the reach crane mechanical legs connected to the front of the reach crane frame as the torque balance center of the reach crane, so that the torque balance center of the front wheels of the reach crane is moved forward to achieve long-row lifting without counterweight or with less counterweight. Moreover, the reach crane mechanical legs provided by the present invention can be contracted in a semicircular arc and swing back and forth, shortening the duration of conventional supporting operations. It has the advantages of small deadweight and low operating energy consumption, and greatly saves costs.

[0006] To achieve the purpose of the present invention, on the one hand, the present invention provides a front crane mechanical leg, including a leg mounting frame connected to the front end of the front crane frame and having a leg fixing frame with a cavity structure; a lifting mechanism connected to the leg mounting frame at one end by utilizing the cavity structure of the leg fixing frame, and a leg mechanism connected to the lifting mechanism and capable of changing at multiple angles therewith.

[0007] Wherein, the leg mounting frame is in an inverted "L" shape.

[0008] Specifically, one end of the leg mounting frame is fixedly connected to the front side of the front crane frame, and the other end extends downward in an inverted "L" shape to form a leg fixing frame with a cavity structure.

[0009] Wherein, a lifting cylinder mounting seat is provided above one end of the outrigger mounting frame.

[0010] Among them, the lifting mechanism includes a lifting cylinder, one end of which passes through the cavity structure of the leg fixing frame and is connected to the lifting cylinder mounting seat, and the other end is connected to the sliding leg frame and a crossbeam connected to the lower end of the sliding leg frame.

[0011] The sliding leg frame can slide up and down in the inner cavity of the leg fixing frame. One end of the lifting cylinder is hinged to the leg fixing frame through the upper pin of the lifting cylinder. The sliding leg frame is hinged to the lifting cylinder through the lower pin of the lifting cylinder. The crossbeam is hinged to the leg fixing frame through the crossbeam pin.

[0012] Specifically, the leg mechanism includes a middle leg mechanism hinged on the sliding leg frame through a crossbeam pin, an outer leg mechanism and an inner leg mechanism hinged on both ends of the crossbeam respectively, and an arc swing mechanism.

[0013] Among them, the middle leg mechanism includes a middle leg outer sleeve, one end of which is hinged on the sliding leg frame through a crossbeam pin, a middle leg inner sleeve sleeved in the middle leg outer sleeve, a middle leg connected to the middle leg inner sleeve, and an elastic component sleeved on the outer surface of the middle leg inner sleeve and located between the middle leg outer sleeve and the middle leg.

[0014] Specifically, the middle leg outer cover has a hollow structure for sleeve connection with the middle leg inner cover. The middle leg outer cover has waist-shaped holes on both sides, and the middle leg inner cover is provided with a sliding key, which slides up and down within the range of the waist-shaped holes, making the middle leg mechanism more flexible and improving its adaptability to the road surface.

[0015] Furthermore, the bottom of the middle leg inner sleeve is a supporting ball head, which is matched with the connecting ball head arranged on the middle leg, so that the middle leg ball is connected to the lower end of the middle leg inner sleeve.

[0016] Furthermore, the elastic component is any commercially available elastic body, such as a spring, and the present invention does not impose any limitation thereto.

[0017] Specifically, the outer leg mechanism includes an outer leg connecting member connected to the outer side of the crossbeam, and an outer leg connected to the outer leg connecting member.

[0018] Specifically, the outer side of the cross beam is hinged to the outer leg connecting piece through an outer upper pin, and the outer leg connecting piece and the outer leg are hinged to each other through an outer lower pin.

[0019] Specifically, the inner leg mechanism includes an inner leg connector connected to the inner side of the crossbeam, and an inner leg connected to the inner leg connector.

[0020] Specifically, the inner side of the cross beam is hinged to the inner leg connecting piece through an inner upper pin, and the inner leg connecting piece and the inner leg are hinged to each other through an inner lower pin.

[0021] Furthermore, the middle leg is hinged to the outer leg and the inner leg respectively through the leg mounting seat.

[0022] Wherein, the inner leg connecting member is a connecting rod or an oil cylinder or an air cylinder.

[0023] Wherein, the outer leg connecting member is a connecting rod or an oil cylinder or an air cylinder.

[0024] Among them, the arc swing mechanism includes a swing cylinder connected between the sliding leg frame and the inner leg connecting piece, a swing cylinder mounting rod hinged to one end of the swing cylinder on the sliding leg frame, and a swing cylinder mounting seat hinged to one end of the swing cylinder on the inner leg connecting piece.

[0025] Among them, the middle leg, the outer leg and the inner leg are all provided with reinforcing plate ribs, the reinforcing plate ribs are parallel to the length direction of the middle leg, the outer leg and the inner leg, and are only provided on the side close to the main machine.

[0026] In order to achieve the technical purpose of the present invention, the present invention provides a lightweight reach stacker on the other hand, including a reach stacker frame and the reach stacker mechanical legs as described above installed at the front end of the reach stacker frame.

[0027] There are two front crane mechanical legs, which are symmetrically installed on both sides of the front end of the front crane frame.

[0028] Beneficial effects:

[0029] 1. The lightweight reach crane provided by the present invention utilizes the reach crane mechanical legs connected to the front of the reach crane frame as the torque balance center of the reach crane, so that the torque balance center of the front wheel of the reach crane is moved forward to realize long-distance lifting without / less counterweight. It has small dead weight and low operating energy consumption, which can reduce the weight of the entire equipment by about 20%, reduce fuel consumption by 20% when driving without load, and reduce fuel consumption by more than 14% when driving with heavy load. In addition, the power transmission system can be optimized accordingly, reducing the engine power and gearbox specifications, further reducing the inherent fuel consumption of the equipment power system and the equipment cost, saving energy and reducing emissions, and being low in cost.

[0030] 2. The reach crane without counterweight or with greatly reduced rear counterweight provided by the present invention can greatly reduce the wheel pressure of the rear wheels of the reach crane. According to the inverse relationship between the number of times a vehicle passes on a hardened road surface and the wheel pressure to the Nth power, the rear wheel pressure of the reach crane using the patented reach crane product is about 73% of that of an ordinary reach crane, which can increase the service life of the site road surface by 2.5-3.3 times.

[0031] 3. Since the multiple leg plates of the mechanical legs of the reach crane provided by the present invention can be changed into an arc shape, the whole vehicle can be safely moved by only fine-tuning the height and direction. At this time, the oil cylinder lifting speed is about 50-100mm / second, that is, the reach crane provided by the present invention can complete the retraction and extension of the legs 1 within 0.5 to 1 second, realizing rapid retraction and extension.

[0032] 4. When using the reach crane mechanical legs provided by the present invention to carry out multi-row container lifting operations, the boom can be extended forward while the legs are activated to quickly descend to a position close to the ground to avoid road obstacles. When the reach crane reaches the target container position, the bottom of the legs are unfolded into a straight plane, so that the front wheels are off the ground until the pressure of the main oil cylinder matches the load of the lifting container. When the boom reaches the operating container position, the container can be lifted and placed. Moreover, the force on each support plane of the front legs is about 1 / 3 of the entire leg, so the force on each support plane is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic cross-sectional structure diagram of a front crane mechanical leg provided in Example 1 of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the leg mechanism of the front crane mechanical leg provided in Example 1 of the present invention;

[0035] Figure 3 1 is a schematic structural diagram of an arc swing mechanism of a front crane mechanical leg provided in Example 1 of the present invention;

[0036] Figure 4 is a schematic diagram of the structure of a front crane mechanical leg provided in Example 1 of the present invention;

[0037] Figure 5 is a schematic structural diagram of a lightweight reach stacker provided in Example 3 of the present invention;

[0038] Figure 6 This is a state diagram of the mechanical legs of the lightweight reach loader provided by Application Example 1 of the present invention when they are retracted at 90 degrees;

[0039] Figure 7 1 is a schematic diagram of the structure of the mechanical legs of the lightweight reach crane in different states provided in Example 1 of the present invention, wherein the right side is a state diagram of the curved surface in the stopped state or the walking state;

[0040] Figure 8 Schematic diagram of the distance relationship between the lightweight front crane frame provided by the application embodiment 2 of the present invention and the containers H beyond the 2nd and 3rd rows;

[0041] Fig. 9 This is a state diagram of the front crane mechanical legs provided by Application Example 2 of the present invention being in a semi-arc shape.

[0042] In the figure, 1, front crane frame; 2, outrigger mounting frame; 21, outrigger fixing frame; 22, lifting cylinder mounting seat; 3, lifting mechanism; 31, lifting cylinder; 32, sliding outrigger frame; 33, upper pin shaft of lifting cylinder; 34, lower pin shaft of lifting cylinder; 35, crossbeam; 36, crossbeam pin shaft. 4. Leg mechanism; 41. Middle leg mechanism; 411. Middle leg outer sleeve; 4111. Waist-shaped hole; 4121. Slide key; 412. Middle leg inner sleeve; 413. Middle leg; 414. Elastic component; 415. Support ball head; 416. Connecting ball head; 42. Outer leg mechanism; 421. Outer leg connector; 422. Outer leg; 423. Outer upper pin; 424. Outer lower pin; 43. Inner leg mechanism; 431. Inner leg connector; 432. Inner leg; 433. Inner upper pin; 44. Arc swing mechanism; 441. Swing cylinder; 442. Swing cylinder mounting rod; 443. Swing cylinder mounting seat; 45. Leg mounting seat; 46. Strengthening plate ribs.

[0043] H. Container.

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0046] The following is combined with Figure 1-9 The specific embodiments of the present disclosure are described in detail.

[0047] Example 1: Front crane mechanical legs

[0048] like Figure 1-4As shown, a front crane mechanical leg provided by the present invention comprises a leg mounting frame 2 having a leg fixing frame 21 with a cavity structure connected to the front end of a front crane frame 1; a lifting mechanism 3 connected to the leg mounting frame at one end by utilizing the cavity structure of the leg fixing frame 21, and a leg mechanism 4 connected to the lifting mechanism 3 and capable of changing at multiple angles therewith.

[0049] Further, one end of the leg mounting frame 2 is fixedly connected to the front side of the front crane frame, and the other end extends downward in an inverted "L" shape to form a leg mounting frame 21 with a cavity structure. Among them, a lifting cylinder mounting seat 22 is provided above one end of the leg mounting frame 2.

[0050] Further, such as Figure 1 As shown, the lifting mechanism 3 includes a lifting cylinder 31, one end of which passes through the cavity structure of the leg fixing frame 21 and is connected to the lifting cylinder mounting seat 22, and the other end is connected to the sliding leg frame 32, and a crossbeam 35 connected to the lower end of the sliding leg frame.

[0051] Specifically, the sliding leg frame 32 can slide up and down in the inner cavity of the leg fixing frame 21. One end of the lifting cylinder 31 is hinged to the leg fixing frame 21 through the lifting cylinder upper pin 33. The sliding leg frame 32 is hinged to the lifting cylinder 31 through the lifting cylinder lower pin 34. The crossbeam 35 is hinged to the leg fixing frame 21 at its middle through the crossbeam pin 36.

[0052] Specifically, the leg mechanism 4 includes a middle leg mechanism 41 hinged on the sliding leg frame 32 through a crossbeam pin 36 , an outer leg mechanism 42 and an inner leg mechanism 43 hinged on both ends of the crossbeam 35 , and an arc swing mechanism 44 .

[0053] Further, such as Figure 2 As shown, the middle leg mechanism 41 includes a middle leg outer sleeve 411, one end of which is hinged on the sliding leg frame 32 through a crossbeam pin 36, a middle leg inner sleeve 412 sleeved in the middle leg outer sleeve 411, a middle leg 413 connected to the middle leg inner sleeve 412, and an elastic component 414 sleeved on the outer surface of the middle leg inner sleeve 412 and located between the middle leg outer sleeve 411 and the middle leg 413.

[0054] Specifically, the middle leg outer cover 411 has a hollow structure for sleeve connection with the middle leg inner cover 412. The middle leg outer cover 411 has waist-shaped holes 4111 on both sides, and the middle leg inner cover 412 has a sliding key 4121, which slides up and down within the range of the waist-shaped hole 4111, making the middle leg mechanism more flexible and improving its adaptability to the road surface.

[0055] Furthermore, the bottom of the middle leg inner sleeve 412 is a supporting ball head 415 , which is matched with the connecting ball head 416 set on the middle leg 413 , so that the middle leg 413 is ball-connected to the lower end of the middle leg inner sleeve 412 .

[0056] Furthermore, the elastic component 414 is any commercially available elastic body, such as a spring, and the present invention does not limit this.

[0057] Specifically, the outer leg mechanism 42 includes an outer leg connector 421 connected to the outer side of the cross beam 36 , and an outer leg 422 connected to the outer leg connector 421 .

[0058] Specifically, the outer side of the cross beam 36 is hinged to the outer leg connecting piece 421 via an outer upper pin shaft 423 , and the outer leg connecting piece 421 and the outer leg 422 are hinged via an outer lower pin shaft 424 .

[0059] Specifically, the inner supporting leg mechanism 43 includes an inner supporting leg connecting member 431 connected to the inner side of the cross beam 36 , and an inner supporting leg 432 connected to the inner supporting leg connecting member 431 .

[0060] Specifically, the inner side of the cross beam 36 is hinged to the inner leg connecting piece 431 via an inner upper pin shaft 433 , and the inner leg connecting piece 431 and the inner leg 432 are hinged via an inner lower pin shaft 434 .

[0061] Furthermore, the middle leg 413 is hinged to the outer leg 422 and the inner leg 432 respectively through the leg mounting seat 45 .

[0062] The outer leg connecting member 421 and the inner leg connecting member 431 are connecting rods. Figure 3 As shown, the arc swing mechanism 44 includes a swing cylinder 441 connected between the sliding leg frame 32 and the inner leg connecting piece 431, a swing cylinder mounting rod 442 hingedly connecting one end of the swing cylinder 441 to the sliding leg frame 32, and a swing cylinder mounting seat 443 hingedly connecting one end of the swing cylinder 441 to the inner leg connecting piece 431.

[0063] Furthermore, the middle leg 413, the outer leg 422 and the inner leg 432 are all provided with reinforcing ribs 46, such as Figure 4 As shown, the reinforcing plate rib 46 is parallel to the length direction of the middle leg 413, the outer leg 422 and the inner leg 432, and is only provided on the side close to the main machine.

[0064] Example 2: Front crane mechanical legs

[0065] Except that the outer leg connecting member 421 and the inner leg connecting member 431 are oil cylinders or air cylinders, the rest is the same as that of the first embodiment.

[0066] The present invention utilizes an oil cylinder to connect the crossbeam and the inner supporting leg, and utilizes an oil cylinder to connect the crossbeam and the outer supporting leg, thereby accelerating the retraction and extension speed of the supporting leg mechanism, making the activity more flexible, and the retraction and extension of the mechanical leg can be completed within 0.1 to 0.6 seconds.

[0067] Example 3 Lightweight reach stacker

[0068] like Figure 5 As shown, the lightweight reach stacker provided by the present invention comprises a reach stacker frame 1 and two reach stacker mechanical legs A described in Embodiment 1 installed at the front end of the reach stacker frame 1 .

[0069] Application Example 1: Shutdown State

[0070] Before the lightweight front crane provided by the present invention performs a lifting operation, the lifting mechanism 3 and the leg mechanism 4 are at an angle of 90° or less than 90°, which is a recovery state. Figure 6 or Figure 7 The outrigger mechanism on the right is shown.

[0071] Application Example 2 Operation Status

[0072] When the lightweight reach stacker provided by the present invention is performing the operation of lifting the first row of containers, the state of the mechanical legs remains unchanged and is still in the retracted state.

[0073] When lifting containers beyond the 2nd and 3rd rows, the operator can extend the boom and start the mechanical legs at the same time. The specific operation process is as follows:

[0074] When the boom is extended, the lifting cylinder 31 is controlled to extend, driving the sliding leg frame 32 to descend, and the cross beam 35 is lowered accordingly, and the outer leg connecting member 421 and the inner leg connecting member 431 connected to the cross beam 35 move, so that the outer leg 422 and the inner leg 432 are extended and unfolded to the ground into a supporting plane state (such as Figure 4 As shown in the figure, the pressure provided by the pressure chamber of the lifting cylinder 31 makes the swing cylinder 441 synchronously support downward and automatically bear 1 / 3 of the support force of the entire leg, so that the front wheel of the front crane is lifted off the ground until the pressure of the lifting cylinder matches the load of the lifting container. When the boom reaches the operating container position, the container can be placed. Since the support plane of the two mechanical legs is subjected to about 1 / 3 of the entire leg, the force on each support plane is uniform.

[0075] When the lightweight reach stacker provided by the present invention is used for lifting operations, mechanical calculations are performed, such as Figure 8 As shown:

[0076] By using the two mechanical legs provided by the present invention as the torque balance center of the reach crane, without using a counterweight, the deadweight of the reach crane is reduced, and the torque balance center of the front wheel of the reach crane is increased forward by about 550 mm.

[0077] According to the moment balance principle of the front crane working moment and the equipment stability moment, it is calculated as follows:

[0078] Assume: G is the deadweight of the reach stacker (72 tons): G2 is the working load (31 tons) + the weight of the spreader (8 tons)

[0079] L1 = distance from the center of gravity of the equipment to the center of moment balance, L2 = distance from the load to the center of moment balance

[0080] Reach loader without mechanical legs: G = G2 × L2 / L1

[0081] Front gantry with mechanical legs: G1 = G2 × (L2-550mm) / (L1 + 550mm)

[0082] Ordinary 45 ton reach stacker, L1 = 3500mm, L2 = 4600mm

[0083] Then (G-G1) / G=0.23%

[0084] The above calculation shows that the deadweight of the reach stacker with front outriggers is 23% less than that of the ordinary reach stacker. Considering that the spreader cannot be reduced in weight, the actual weight reduction is approximately:

[0085] (72-8)×23% / 72=20%.

[0086] 4. The boom extension operation is completed.

[0087] When the 2nd and 3rd rows of cranes are lifted and pulled back to the 1st row, the lifting cylinder 31 can be retracted and the swing cylinder 441 can be retracted at the same time, so that the outrigger mechanism 4 swings inwards and forms a 90° or more angle with the lifting mechanism, so that the passing height of the mechanical legs reaches the designed ground clearance value, and the reach crane can move normally. The specific operations are as follows:

[0088] The lifting cylinder 31 retracts, driving the sliding leg frame 32 to rise (for example 50mm). The sliding leg frame 32 drives the crossbeam 35 to rise. The crossbeam 35 drives the outer leg connector 421, the inner leg connector 431 and the middle leg jacket 411 to rise. Since the middle leg inner jacket 412 remains motionless on the ground under the action of the elastic component 414, the rise of the outer leg connector 421 and the inner leg connector 431 will cause the outer legs 422 and the outer legs 432 to flip up, while the middle leg 413 remains unchanged. When the sliding key 4121 on the middle leg inner jacket 412 moves downward along the waist-shaped hole 4111 on the middle leg jacket 411 to the lowest limit position, the middle leg 413, the outer leg 422 and the inner leg 432 form an arc surface, and the entire leg mechanism is as shown in FIG. Fig. 9 As shown, the lifting cylinder 31 continues to retract, and the entire leg is Fig. 9 The posture shown rises, and the swing cylinder 441 is controlled to retract while rising. The present invention simultaneously performs posture change, rising and swinging of the outrigger mechanism, thereby improving the rapid retraction of the outrigger mechanism.

[0089] At this time, the lifting speed of the cylinder is about 50-100 mm / s. It can be seen that the reach loader provided by the present invention can complete the retraction and extension of the mechanical legs within 0.5 to 1 second, with high efficiency, which is equivalent to the operating efficiency of the conventional reach loader.

[0090] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A front loader mechanical leg, characterized in that: include: An outrigger mounting frame having an outrigger fixing frame with a hollow structure connected to the front end of the front crane frame; A lifting mechanism connected to the leg mounting frame at one end by utilizing the cavity structure of the leg fixing frame, wherein the lifting mechanism comprises a sliding leg frame, and the sliding leg frame can slide up and down in the cavity inside the leg fixing frame; A leg mechanism connected to the lifting mechanism and capable of changing angles with the lifting mechanism; Wherein, the leg mechanism comprises: A middle outrigger mechanism hinged to the sliding outrigger frame through a crossbeam pin; An outer outrigger mechanism and an inner outrigger mechanism respectively hinged at both ends of the crossbeam, and An arc swing mechanism connected between the sliding leg frame and the inner leg connecting piece; The middle leg mechanism is hinged to the outer leg mechanism and the inner leg mechanism respectively.

2. The reach loader mechanical leg according to claim 1, characterized in that: The leg mounting frame is in an inverted "L" shape.

3. The reach loader mechanical leg according to claim 1, characterized in that: The lifting mechanism comprises: One end of the lifting cylinder passes through the cavity structure of the leg fixing frame and is connected to the lifting cylinder mounting seat, and the other end is connected to the sliding leg frame and the crossbeam connected to the lower end of the sliding leg frame.

4. The reach loader mechanical leg according to claim 1, characterized in that: The middle leg mechanism comprises: A middle leg jacket having one end hinged to the sliding leg frame through a crossbeam pin; A mid-leg inner jacket that fits inside the mid-leg outer jacket; a middle leg connected to the middle leg inner sleeve, and An elastic component sleeved on the outer surface of the middle leg inner sleeve and located between the middle leg outer sleeve and the middle leg; The middle leg outer sleeve is provided with waist-shaped holes on both sides, and the middle leg inner sleeve is provided with a sliding key, which is within the range of the waist-shaped holes. Inward and downward sliding; Wherein, the middle leg ball is connected to the lower end of the middle leg inner sleeve.

5. The reach crane mechanical leg according to claim 4, characterized in that: The outer leg mechanism comprises: an outboard leg connector connected to the outboard side of the crossbeam; and An outboard leg connected to the outboard leg connector.

6. The reach loader mechanical leg according to claim 5, characterized in that: The inner leg mechanism comprises: an inboard leg connector connected to the inboard side of the cross member; and An inner leg connected to the inner leg connector.

7. The reach crane mechanical leg according to claim 6, characterized in that: The outer leg connecting piece is connected The inner leg connecting piece is a connecting rod, oil cylinder or air cylinder.

8. The reach loader mechanical leg according to claim 1, characterized in that: The arc swing mechanism comprises: A swing cylinder connected between the sliding outrigger frame and the inner outrigger connector; Hinging one end of the swing cylinder to the swing cylinder mounting rod on the sliding leg frame; and One end of the swing cylinder is hinged to the swing cylinder mounting base on the inner leg connecting piece.

9. The reach crane mechanical leg according to claim 6 or 7, characterized in that: The middle leg is hinged to the outer leg and the inner leg through the leg mounting seat to form a movable whole.

10. The reach loader mechanical leg according to claim 6 or 7, characterized in that: The middle supporting leg, the outer supporting leg and the inner supporting leg are all provided with reinforcing plate ribs in the length direction, and are only provided on one side close to the front crane frame.

11. A lightweight reach stacker, comprising a reach stacker frame, characterized in that: Also includes installation on the front end of the front crane frame The reach crane mechanical leg according to any one of claims 1 to 10; in, There are two front crane mechanical legs, which are symmetrically arranged on both sides in front of the front crane frame.

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