Rear counterweight structure and crawler crane

Abstract

The present invention belongs to the technical field of engineering machinery, and specifically relates to a rear counterweight structure and a crawler crane. The crawler crane includes a turntable, and the rear counterweight structure includes a counterweight frame, a counterweight support frame, and a push-pull power device. The counterweight frame is located at the end of the turntable. The counterweight support frame includes a first counterweight bracket group pivotally connected to the turntable and a second counterweight bracket group pivotally connected to the counterweight frame, and the first counterweight bracket group and the second counterweight bracket group can pivot relative to each other. The push-pull power device is installed on the turntable and connected to the counterweight frame. In the process of the push-pull power device driving the counterweight frame to expand and retract, the first counterweight bracket group and the second counterweight bracket group pivot relative to each other and make the counterweight frame maintain a curved translation. In this way, the counterweight frame is prevented from shaking during the movement, and the stability of the counterweight frame during the movement is ensured, thereby improving the stability of the crawler crane as a whole.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular, relates to a rear counterweight structure and a crawler crane. Background Art

[0002] For crawler cranes without super-lift counterweights, in order to improve the lifting capacity of such crawler cranes, a counterweight frame is fixedly installed at the end of the turntable. However, due to the fixed position of the counterweight frame, the lifting capacity of such crawler cranes is limited. In order to further improve the lifting capacity of the crawler crane, the counterweight frame is driven to be deployed or retracted relative to the turntable through the cooperation of the transmission structure and the power device. However, in the process of controlling the movement of the counterweight frame by the existing transmission structure, the counterweight frame is prone to shaking, and the stability of the counterweight frame during the movement is poor. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a rear counterweight structure and a crawler crane. During the process of extending and retracting the counterweight frame, the rear counterweight structure can enable the counterweight frame to always maintain curved translation, prevent the counterweight frame from shaking, and ensure the stability of the counterweight frame during movement.

[0004] To achieve the above object, the present invention provides a rear counterweight structure for a crawler crane in a first aspect. The crawler crane includes a turntable. The rear counterweight structure includes:

[0005] The counterweight frame is located at the end of the turntable;

[0006] A counterweight support frame, comprising a first counterweight support group pivotally connected to the turntable and a second counterweight support group pivotally connected to the counterweight frame, wherein the first counterweight support group and the second counterweight support group are capable of relatively pivoting; and

[0007] A push-pull power unit, mounted on a turntable and connected to a counterweight frame;

[0008] In the process of the push-pull power device driving the counterweight frame to expand and retract, the first counterweight bracket group and the second counterweight bracket group pivot relative to each other and make the counterweight frame maintain the curved translation.

[0009] Optionally, the counterweight support frame further includes a vertical middle bracket arranged in the vertical direction, the first counterweight bracket group is pivotally connected to the vertical middle bracket and is located on a lateral side of the vertical middle bracket, and the first counterweight bracket group, the vertical middle bracket and the turntable form a plurality of first parallelogram linkage mechanisms arranged in parallel;

[0010] The second counterweight bracket group is pivotally connected to the vertical middle bracket and is located on the other lateral side of the vertical middle bracket. The second counterweight bracket group, the vertical middle bracket and the counterweight frame form a plurality of second parallelogram linkage mechanisms arranged in parallel.

[0011] Optionally, the first parallelogram linkage mechanism is identical to the second parallelogram linkage mechanism and is symmetrically arranged on two lateral sides of the vertical center bracket.

[0012] Optionally, the vertical middle bracket includes an upper pivot shaft and a lower pivot shaft disposed below the upper pivot shaft;

[0013] Upper brackets are symmetrically arranged on both sides of the vertical middle bracket, and the upper brackets are pivotally connected to the upper pivot shaft rod. Lower brackets are also symmetrically arranged on both sides of the vertical middle bracket, and the lower brackets are pivotally connected to the lower pivot shaft rod.

[0014] The upper bracket and the lower bracket located on one lateral side of the vertical middle bracket form a first counterweight bracket group, and the upper bracket and the lower bracket located on the other lateral side of the vertical middle bracket form a second counterweight bracket group.

[0015] Optionally, two lateral sides of the end of the turntable extend toward the counterweight frame with locking mechanism mounting ears, and the locking mechanism is arranged in the locking mechanism mounting ears;

[0016] The counterweight frame is provided with two counterweight frame fixing ear seats extending toward the turntable and arranged at intervals in the transverse direction;

[0017] When the counterweight frame is retracted to the extreme position, the counterweight frame fixing ear seat is located laterally outside the locking mechanism mounting ear seat, and the locking mechanism is used to lock the counterweight frame fixing ear seat.

[0018] Optionally, the locking mechanism mounting ear seat is provided with a locking block mounting longitudinal groove and a turntable locking pin hole that transversely passes through the locking block mounting longitudinal groove;

[0019] The counterweight frame fixing ear seat is provided with a counterweight frame supporting pin shaft and a counterweight frame locking pin hole;

[0020] The locking mechanism comprises a locking block arranged in the locking block mounting longitudinal groove and a locking power device connected to the locking block, wherein the locking block is provided with a locking block locking pin hole and a counterweight frame supporting pin shaft recess at the top end;

[0021] Among them, when the counterweight frame is recovered to the extreme position, the turntable locking pin hole is coaxial with the counterweight frame locking pin hole, and the locking power device can drive the locking block to move, so that the counterweight frame support pin shaft recess is connected with the counterweight frame support pin shaft, and the locking block locking pin hole is coaxial with the counterweight frame locking pin hole and the turntable locking pin hole.

[0022] Optionally, the locking block is pivotally connected to the locking mechanism mounting ear seat, one end of the locking power device is pivotally connected to the end bottom of the turntable, and the other end is connected to the bottom end of the locking block, and the locking power device drives the locking block to pivot relative to the locking mechanism mounting ear seat.

[0023] Optionally, the locking mechanism mounting ear seat further includes a first locking block limiting plate and a second locking block limiting plate arranged in the locking block mounting longitudinal groove, and the locking block swings between the first locking block limiting plate and the second locking block limiting plate.

[0024] Optionally, a counterweight frame groove is provided on one side of the counterweight frame close to the turntable, a counterweight frame fixing ear seat is located on the inner wall of the counterweight frame groove, and a counterweight bracket connecting ear seat group located between two counterweight frame fixing ear seats is also provided on the inner wall of the counterweight frame groove;

[0025] The end of the turntable is also provided with a turntable bracket connecting ear seat group located between the two locking mechanism mounting ear seats;

[0026] When the counterweight frame is retracted to the extreme position, the counterweight support frame is located in the counterweight frame slot.

[0027] Optionally, a lifting device is further provided on the lateral outer side of the locking mechanism mounting ear seat, and when the counterweight frame is retracted to the extreme position, the lifting device is located below the counterweight frame.

[0028] Optionally, the crawler crane further comprises an A-frame arranged on the turntable, and the rear counterweight structure further comprises a counterweight frame pull plate, one end of the counterweight frame pull plate is pivotally connected to the A-frame, and the other end is pivotally connected to the counterweight frame.

[0029] Optionally, a sensor for detecting axial force is also provided on the pull plate of the counterweight frame.

[0030] A second aspect of the present invention provides a crawler crane, which comprises the above-mentioned rear counterweight structure.

[0031] In the rear counterweight structure of the present invention, the counterweight support frame is connected between the turntable and the counterweight frame, wherein the first counterweight support group is connected to the turntable, and the second counterweight support group is connected to the counterweight frame. In the process of the push-pull power device pushing and pulling the counterweight frame to move, the first counterweight support group and the second counterweight support group are pivoted relative to each other, so that the counterweight frame is deployed or retracted relative to the turntable. In particular, under the action of the counterweight support frame, the counterweight frame is ensured to maintain a curved translation, that is, the counterweight frame always remains parallel during the movement, thus avoiding the counterweight frame from shaking during the movement, ensuring the stability of the counterweight frame during the movement, and thus improving the stability of the crawler crane as a whole.

[0032] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 A front view of a crawler crane provided according to a specific embodiment of the present invention;

[0035] Figure 2 for Figure 1 A front view of the rear counterweight structure of the crawler crane;

[0036] Figure 3 for Figure 2 A partial enlarged schematic diagram of the rear counterweight structure;

[0037] Figure 4 for Figure 3 A cross-sectional view of the rear counterweight structure in FIG.

[0038] Figure 5 for Figure 4 A partial enlarged view of the rear counterweight structure;

[0039] Figure 6 A schematic diagram of a counterweight support frame provided according to a specific embodiment of the present invention;

[0040] Figure 7 for Figure 6 A front view of the counterweight support frame in FIG.

[0041] Figure 8 A schematic diagram of a counterweight frame provided according to a specific embodiment of the present invention;

[0042] Fig. 9 It is a schematic diagram of the end of a turntable provided according to a specific embodiment of the present invention.

[0043] Explanation of reference numerals: 100, turntable; 110, ear seat for mounting the locking mechanism; 111, longitudinal groove for mounting the locking block; 112, locking pin hole for the turntable; 113, limiting plate for the first locking block; 114, limiting plate for the second locking block; 115, pivoting connection hole for the turntable; 120, ear seat group for connecting the turntable bracket; 121, ear seat for connecting the bracket on the turntable; 122, ear seat for connecting the lower bracket of the turntable; 200, herringbone frame; 300, counterweight frame; 310, slot for the counterweight frame; 320, ear seat for fixing the counterweight frame; 321, support pin for the counterweight frame; 322, locking pin hole for the counterweight frame; 330, ear seat group for connecting the counterweight bracket; 331, counterweight upper bracket connecting ear seat; 332, counterweight lower bracket connecting ear seat; 340, counterweight drive connecting ear seat; 350, counterweight pull rod connecting ear seat; 400, counterweight support frame; 410, vertical middle bracket; 411, upper pivot shaft; 412, lower pivot shaft; 420, upper bracket; 430, lower bracket; 500, push-pull power device; 600, locking mechanism; 610, locking block; 611, locking block locking pin hole; 612, counterweight frame support pin shaft notch; 613, locking block pivot connection hole; 620, locking power device; 700, counterweight frame pull plate; 800, jacking device DETAILED DESCRIPTION

[0044] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0046] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationship of components with respect to the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0047] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0048] Figure 2 for Figure 1 Front view of the rear counterweight structure of the crawler crane. Figure 3 for Figure 2 A partial enlarged schematic diagram of the rear counterweight structure in FIG. Figure 2 and Figure 3As shown, in an exemplary embodiment of the present invention, a rear counterweight structure for a crawler crane is provided, the crawler crane includes a turntable 100, the rear counterweight structure includes a counterweight frame 300, a counterweight support frame 400 and a push-pull power device 500. The counterweight frame 300 is located at the end of the turntable 100. The counterweight support frame 400 includes a first counterweight bracket group pivotally connected to the turntable 100 and a second counterweight bracket group pivotally connected to the counterweight frame 300, and the first counterweight bracket group and the second counterweight bracket group can pivot relative to each other. The push-pull power device 500 is installed on the turntable 100 and connected to the counterweight frame 300. In the process of the push-pull power device 500 driving the counterweight frame 300 to expand and retract, the first counterweight bracket group and the second counterweight bracket group pivot relative to each other and make the counterweight frame 300 maintain a curved translation.

[0049] Specifically, the counterweight support frame 400 is connected between the turntable 100 and the counterweight frame 300, wherein the first counterweight support group is connected to the turntable 100, and the second counterweight support group is connected to the counterweight frame 300. In the process of the push-pull power device 500 pushing and pulling the counterweight frame 300, the first counterweight support group and the second counterweight support group are relatively pivoted, so that the counterweight frame 300 is deployed or retracted relative to the turntable 100. In particular, under the action of the counterweight support frame 400, the counterweight frame 300 is ensured to maintain a curved translation, that is, the counterweight frame 300 always remains parallel during the movement, so that the counterweight frame 300 is prevented from shaking during the movement, and the stability of the counterweight frame 300 during the movement is ensured, thereby improving the stability of the crawler crane as a whole.

[0050] It should be noted that, in the embodiment of the present invention, the push-pull power device 500 includes an existing device with a telescopic rod, such as an oil cylinder, an electric cylinder, an electro-hydraulic push rod, etc.

[0051] In order to ensure that the counterweight frame 300 always moves in a curved translation, the counterweight support frame 400 further includes a vertical middle bracket 410 arranged in the vertical direction, the first counterweight bracket group is pivotally connected to the vertical middle bracket 410 and is located on one lateral side of the vertical middle bracket 410, and the first counterweight bracket group, the vertical middle bracket 410 and the turntable 100 form a plurality of first parallelogram linkage mechanisms arranged in parallel. The second counterweight bracket group is pivotally connected to the vertical middle bracket 410 and is located on the other lateral side of the vertical middle bracket 410, and the second counterweight bracket group, the vertical middle bracket 410 and the counterweight frame 300 form a plurality of second parallelogram linkage mechanisms arranged in parallel.

[0052] Specifically, in order to ensure that the counterweight frame 300 does not shake during the movement process. Therefore, in this embodiment, the second counterweight bracket group, the vertical middle bracket 410 and the counterweight frame 300 form a plurality of second parallelogram linkage mechanisms arranged in parallel, wherein the counterweight frame 300 is driven to move by the push-pull power device 500, the counterweight frame 300 serves as a connecting rod in the second parallelogram linkage mechanism, the vertical middle bracket 410 arranged opposite to the counterweight frame 300 serves as a frame in the second parallelogram linkage mechanism, the second counterweight bracket group pivots with the vertical middle bracket 410 and forms a swing pair, the second counterweight bracket group serves as a rocker in the second parallelogram linkage mechanism, and the counterweight frame 300 serves as a connecting rod in a plurality of parallel second parallelogram linkage mechanisms, so that the counterweight frame 300 can always maintain a curved translation and has better stability during the movement process.

[0053] In order to ensure the stability of the posture of the counterweight frame 300 (the counterweight frame 300 does not rotate), the counterweight frame 300 and the vertical middle bracket 410 arranged relatively in the second parallelogram linkage mechanism always remain parallel, so it is necessary to ensure that the vertical middle bracket 410 always remains in the vertical direction. Therefore, in this embodiment, the turntable 100 serves as the frame in the first parallelogram linkage mechanism, the vertical middle bracket 410 arranged relatively to the turntable 100 serves as the connecting rod in the first parallelogram linkage mechanism, the first counterweight bracket group is pivotally connected to the turntable 100 and forms a swing pair, the first counterweight bracket group serves as the rocker in the first parallelogram linkage mechanism, and the vertical middle bracket 410 serves as the connecting rod of multiple parallel first parallelogram linkage mechanisms, which always maintains translation. In other words, the vertical middle bracket 410 always remains in the vertical direction.

[0054] It should be noted that, by using two pivotally connected brackets and arranging a structure for maintaining the posture of the counterweight frame 300 on the bracket connected to the counterweight frame 300, the counterweight frame 300 can also maintain curved translation. In other words, the present invention is not limited to a parallelogram linkage mechanism.

[0055] In this embodiment, in order to ensure that the counterweight frame 300 is deployed at a relatively stable speed, the first parallelogram linkage mechanism is identical to the second parallelogram linkage mechanism and is symmetrically arranged on both lateral sides of the vertical middle bracket 410 .

[0056] Figure 6 It is a schematic diagram of a counterweight support frame provided according to a specific embodiment of the present invention. Figure 7 for Figure 6 The front view of the counterweight support frame in FIG. Figure 6 and Figure 7As shown, specifically, the first counterweight bracket group and the second counterweight bracket group are symmetrically arranged on both sides of the vertical middle bracket 410, thereby forming a first parallelogram linkage mechanism and a second parallelogram linkage mechanism symmetrically arranged on both sides of the vertical middle bracket 410. During the unfolding process of the counterweight frame 300, the first parallelogram linkage mechanism and the second parallelogram linkage mechanism swing synchronously to ensure the stability of the moving speed of the counterweight frame 300.

[0057] Further, the vertical middle bracket 410 includes an upper pivot shaft 411 and a lower pivot shaft 412 disposed below the upper pivot shaft 411. Upper brackets 420 are symmetrically arranged on both lateral sides of the vertical middle bracket 410, and the upper brackets 420 are pivotally connected to the upper pivot shaft 411. Lower brackets 430 are also symmetrically arranged on both lateral sides of the vertical middle bracket 410, and the lower brackets 430 are pivotally connected to the lower pivot shaft 412. The upper bracket 420 and the lower bracket 430 located on one lateral side of the vertical middle bracket 410 form a first counterweight bracket group, and the upper bracket 420 and the lower bracket 430 located on the other lateral side of the vertical middle bracket 410 form a second counterweight bracket group.

[0058] like Figure 6 and Figure 7 As shown, specifically, the counterweight support frame 400 includes two upper brackets 420 and two lower brackets 430. The two upper brackets 420 are symmetrically arranged on both sides of the vertical middle bracket 410, and the upper brackets 420 are pivotally connected to both ends of the upper pivot shaft 411. The two lower brackets 430 are symmetrically arranged on both sides of the vertical middle bracket 410, and the lower brackets 430 are pivotally connected to both ends of the lower pivot shaft 412. In this way, a first counterweight bracket group and a second counterweight bracket group symmetrically arranged on both sides of the vertical middle bracket 410 are formed. Obviously, the first counterweight bracket group and the second counterweight bracket group are the same, thereby forming a first parallelogram linkage mechanism and a second parallelogram linkage mechanism symmetrically arranged on both sides of the vertical middle bracket 410 and the same.

[0059] It should be noted that if Figure 6 and Figure 7As shown, in the illustrated embodiment, the first counterweight support group is formed with a first parallelogram linkage mechanism located at the lateral ends of the vertical middle support 410, and the second counterweight support group is formed with a second parallelogram linkage mechanism located at the lateral ends of the vertical middle support 410. In other words, in the illustrated embodiment, two first parallelogram linkage mechanisms and two second parallelogram linkage mechanisms are formed on both lateral sides of the vertical middle support 410. It can be understood that the number of parallelogram linkage mechanisms can be increased by appropriately increasing the number of ear seats connected to the counterweight frame 300 and the turntable 100. Of course, in an optional embodiment, in order to further improve the moving stability of the counterweight frame 300, a plurality of counterweight support frames 400 can be arranged side by side between the counterweight frame 300 and the turntable 100.

[0060] In the embodiment of the present invention, the end of the turntable 100 has locking mechanism mounting ears 110 extending toward the counterweight frame 300 on both sides in the horizontal direction, and a locking mechanism 600 is provided in the locking mechanism mounting ears 110. The counterweight frame 300 is provided with two counterweight frame fixing ears 320 extending toward the turntable 100 and arranged at intervals in the horizontal direction. When the counterweight frame 300 is recovered to the extreme position, the counterweight frame fixing ears 320 are located in the horizontal outer side of the locking mechanism mounting ears 110, and the locking mechanism 600 is used to lock the counterweight frame fixing ears 320.

[0061] Figure 4 for Figure 3 A cross-sectional view of the rear counterweight structure in FIG. Figure 4 As shown, in the illustrated embodiment, the counterweight frame 300 is recovered to the extreme position. Specifically, when no lifting operation is required, the counterweight frame 300 can be recovered to the extreme position, and then the counterweight frame fixing ear seat 320 is locked by the locking mechanism 600, so that the counterweight frame 300 is fixed to the end of the turntable 100, so that the crawler crane can keep the counterweight frame 300 stable during the movement.

[0062] It is understandable that, in the case where the locking mechanism 600 is not provided, the counterweight frame 300 can also be locked by the push-pull power device 500. For example, in the case where the push-pull power device 500 is a cylinder, when the counterweight frame 300 is recovered to the limit position, the oil pressure in the rod chamber of the cylinder is maintained by the hydraulic oil circuit system, so that the counterweight frame 300 is always maintained at the limit position of recovery, so that the counterweight frame 300 can also be fixed to the end of the turntable 100. However, the weight of the counterweight frame 300 is relatively large, and the technical means of locking the counterweight frame 300 by the push-pull power device 500 has high performance requirements on the push-pull power device 500 and the corresponding hydraulic oil circuit system. Therefore, in comparison, the use of the locking mechanism 600 can reduce costs while ensuring that the counterweight frame 300 is stably locked.

[0063] Furthermore, the locking mechanism mounting ear seat 110 is provided with a locking block mounting longitudinal groove 111 and a turntable locking pin hole 112 that transversely passes through the locking block mounting longitudinal groove 111. The counterweight frame fixing ear seat 320 is provided with a counterweight frame support pin shaft 321 and a counterweight frame locking pin hole 322. The locking mechanism 600 includes a locking block 610 disposed in the locking block mounting longitudinal groove 111 and a locking power device 620 connected to the locking block 610, and the locking block 610 is provided with a locking block locking pin hole 611 and a counterweight frame support pin shaft recess 612 located at the top. Among them, when the counterweight frame 300 is recovered to the extreme position, the turntable locking pin hole 112 is coaxial with the counterweight frame locking pin hole 322, and the locking power device 620 can drive the locking block 610 to move, so that the counterweight frame support pin shaft recess 612 is connected with the counterweight frame support pin shaft 321, and the locking block locking pin hole 611 is coaxial with the counterweight frame locking pin hole 322 and the turntable locking pin hole 112.

[0064] Figure 5 for Figure 4 A partial enlarged view of the rear counterweight structure. Fig. 9 Schematic diagram of the end of a turntable provided according to a specific embodiment of the present invention. Figure 3 , Figure 5 as well as Fig. 9 As shown, specifically, when the counterweight frame 300 needs to be locked at the end of the turntable 100, the counterweight frame 300 needs to be retracted to the extreme position, the counterweight frame fixing ear seat 320 and the locking mechanism mounting ear seat 110 overlap each other, the turntable locking pin hole 112 is coaxial with the counterweight frame locking pin hole 322, and the locking power device 620 drives the locking block 610 to move to connect the counterweight frame support pin shaft recess 612 with the counterweight frame support pin shaft 321. At the same time, the locking block locking pin hole 611 is coaxial with the counterweight frame locking pin hole 322 and the turntable locking pin hole 112. In this way, the counterweight frame 300 can be locked by inserting a locking pin shaft into the locking block locking pin hole 611, the counterweight frame locking pin hole 322 and the turntable locking pin hole 112.

[0065] It is understandable that when the counterweight frame 300 needs to be unfolded, the lock needs to be released, so the locking pin is pulled out and the locking block 610 is driven to move so that the counterweight frame support pin recess 612 is disconnected from the counterweight frame support pin 321.

[0066] like Figure 3 As shown, it should be noted that, in the illustrated embodiment, the counterweight frame 300 has been unfolded relative to the turntable 100, and a locking pin is inserted into the counterweight frame locking pin hole 322 to prevent the locking pin from being lost. In this embodiment, the locking pin is inserted manually, and of course, the locking pin can also be inserted or extracted by a power device.

[0067] Furthermore, the locking block 610 is pivotally connected to the locking mechanism mounting ear seat 110, one end of the locking power device 620 is pivotally connected to the bottom end of the turntable 100, and the other end is connected to the bottom end of the locking block 610, and the locking power device 620 drives the locking block 610 to pivot relative to the locking mechanism mounting ear seat 110.

[0068] like Figure 5 As shown, in the illustrated embodiment, a turntable pivot connection hole 115 is also provided below the turntable locking pin hole 112, and a locking block pivot connection hole 613 is provided opposite to the locking block 610. A pivot pin is passed through the turntable pivot connection hole 115 and the locking block pivot connection hole 613 to pivotally connect the locking block 610 with the locking mechanism mounting ear seat 110. The locking block 610 is swung to a suitable position under the drive of the locking power device 620.

[0069] Furthermore, the locking mechanism mounting ear seat 110 also includes a first locking block limiting plate 113 and a second locking block limiting plate 114 arranged in the locking block mounting longitudinal groove 111 , and the locking block 610 swings between the first locking block limiting plate 113 and the second locking block limiting plate 114 .

[0070] like Figure 5 As shown, in the illustrated embodiment, the first locking block limiting plate 113 and the second locking block limiting plate 114 are arranged relatively to form a clamping interval, and the locking block 610 swings in the clamping interval, thereby limiting the locking block 610 to swing within a suitable range.

[0071] Of course, the technical means for driving the locking block 610 to move are not limited to the technical solutions in the illustrated embodiment. For example, the locking block 610 can move linearly up and down in the locking block installation longitudinal groove 111, and the locking power device 620 drives the locking block 610 to move upward so that the counterweight frame support pin shaft recess 612 is connected to the counterweight frame support pin shaft 321, and at the same time, the locking block locking pin hole 611 is coaxial with the counterweight frame locking pin hole 322 and the turntable locking pin hole 112. In comparison, the solution of swinging the locking block 610 can occupy a smaller installation space.

[0072] It should be noted that, in the embodiment of the present invention, the push-pull power device 500 includes existing devices with telescopic rods, such as oil cylinders, electric push rods, and gas cylinders, which are not listed one by one here.

[0073] In the embodiment of the present invention, a counterweight frame groove 310 is provided on one side of the counterweight frame 300 close to the turntable 100, a counterweight frame fixing ear seat 320 is located on the inner wall of the counterweight frame groove 310, and a counterweight bracket connecting ear seat group 330 located between two counterweight frame fixing ear seats 320 is also provided on the inner wall of the counterweight frame groove 310. A turntable bracket connecting ear seat group 120 located between two locking mechanism mounting ear seats 110 is also provided at the end of the turntable 100. When the counterweight frame 300 is recovered to the extreme position, the counterweight support frame 400 is located in the counterweight frame groove 310.

[0074] like Figure 3 and Figure 4 As shown, specifically, the turntable bracket connecting ear seat group 120 is connected to the first counterweight bracket group, the counterweight bracket connecting ear seat group 330 is connected to the second counterweight bracket group, the connection between the counterweight support frame 400 and the counterweight frame 300 is located between the two counterweight frame fixing ear seats 320, and the connection between the counterweight support frame 400 and the turntable 100 is located between the two locking mechanism mounting ear seats 110, so that at least part of the counterweight support frame 400 is located in the counterweight frame slot 310, in particular, when the counterweight frame 300 is recovered to the extreme position, the counterweight support frame 400 is located in the counterweight frame slot 310, so that the counterweight frame 300 is compactly connected to the turntable 100, thereby reducing the operating radius of the turntable.

[0075] Figure 8 Schematic diagram of a counterweight frame provided according to a specific embodiment of the present invention. Figure 8 As shown, in the illustrated embodiment, the counterweight support connecting ear seat group 330 includes a counterweight upper support connecting ear seat 331 connected to the upper support 420 and a counterweight lower support connecting ear seat 332 connected to the lower support 430, and a counterweight drive connecting ear seat 340 connected to the push-pull power device 500 is also provided at the bottom middle position of the counterweight frame 300. Fig. 9 As shown, in the illustrated embodiment, the turntable bracket connecting ear seat group 120 includes a turntable upper bracket connecting ear seat 121 connected to the upper bracket 420 and a turntable lower bracket connecting ear seat 122 connected to the lower bracket 430 .

[0076] In an embodiment of the present invention, a lifting device 800 is further provided on the lateral outer side of the locking mechanism mounting ear seat 110 . When the counterweight frame 300 is retracted to the extreme position, the lifting device 800 is located below the counterweight frame 300 .

[0077] It should be noted that the repeated positioning accuracy of the counterweight frame 300 when it is recovered to the extreme position cannot be guaranteed only by the cooperation between the counterweight support frame 400 and the push-pull power device 500. Specifically, when the counterweight frame 300 is recovered to the extreme position, the side wall of the counterweight frame 300 fits with the end side wall of the turntable 100, and the accuracy of the longitudinal orientation can be guaranteed when it is recovered to the extreme position. However, the vertical orientation of the counterweight frame 300 cannot meet the accuracy requirements of repeated positioning under the action of gravity. After the counterweight frame 300 is recovered to the extreme position, the counterweight frame 300 is lifted to a suitable height by the lifting device 800, so that the turntable locking pin hole 112 and the counterweight frame locking pin hole 322 can be coaxial, ensuring that the locking mechanism 600 can fix the counterweight frame fixing ear seat 320.

[0078] In an embodiment of the present invention, the lifting device 800 includes existing devices such as a cylinder, an electro-hydraulic push rod, etc., which can ensure that the counterweight frame 300 can be lifted.

[0079] In an embodiment of the present invention, the crawler crane further includes a herringbone frame 200 disposed on the turntable 100, and the rear counterweight structure further includes a counterweight frame pull plate 700, one end of the counterweight frame pull plate 700 is pivotally connected to the herringbone frame 200, and the other end is pivotally connected to the counterweight frame 300.

[0080] Specifically, the counterweight frame pull plate 700 assists in pulling up the counterweight frame 300, thereby reducing the load exerted by the counterweight frame 300 on the counterweight support frame 400. Therefore, the performance requirements for the counterweight support frame 400 can be appropriately reduced, and its structural dimensions can be appropriately reduced.

[0081] Furthermore, a sensor for detecting axial force is also provided on the counterweight frame pull plate 700. For example, a tension sensor is provided on the counterweight frame pull plate 700 to detect the axial force borne by the counterweight frame pull plate 700, or a pin sensor is provided at the pivot connection of the counterweight frame pull plate 700 to detect the axial force borne by the counterweight frame pull plate 700. Figure 8 As shown, in the illustrated embodiment, a counterweight rod connecting ear seat 350 connected to the counterweight frame pull plate 700 is provided on the counterweight frame 300.

[0082] A crawler crane is also provided in an embodiment of the present invention. The crawler crane includes the above-mentioned rear counterweight structure.

[0083] like Figure 1As shown, the crawler crane can significantly improve the lifting performance of the crawler crane by pushing the counterweight frame 300 backwards to move the center of gravity backwards without adding rear counterweight. In addition, when the working space is limited, the position of the counterweight frame 300 is adjusted to control the turning radius of the turntable 100 to ensure that the crawler crane has better passability. Of course, more importantly, the counterweight frame 300 always maintains the curve translation during the process of extension and retraction to ensure that the center of gravity of the counterweight frame 300 moves smoothly and the stability of the whole machine is ensured. Obviously, the crawler crane has all the beneficial effects brought by the above-mentioned rear counterweight structure, which will not be explained one by one here.

[0084] It should be noted that the crawler crane also includes other components that are independent of the rear counterweight structure or interact with the rear counterweight structure. For example, a control device is connected to a sensor for detecting axial force on the counterweight frame pull plate 700 and a push-pull power device 500. When the locking mechanism 600 locks the counterweight frame 300, the counterweight frame pull plate 700 is not subjected to tension. When the locking mechanism 600 disengages the counterweight frame 300, the counterweight frame pull plate 700 is subjected to a large tension. The control device controls the push-pull power device 500 to move by detecting the force applied to the counterweight frame pull plate 700, thereby improving the automation of the crawler crane.

[0085] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0086] In addition, the terms "first" and "second" 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, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] It should also be noted that the various specific technical features described in the above specific implementation methods can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will no longer separately describe various possible combinations.

[0088] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A rear counterweight structure for a crawler crane, the crawler crane comprising a turntable (100), characterized in that: The rear counterweight structure comprises: A counterweight frame (300) located at the end of the turntable (100); A counterweight support frame (400), comprising a first counterweight support group pivotally connected to the turntable (100) and a second counterweight support group pivotally connected to the counterweight frame (300), the first counterweight support group and the second counterweight support group being capable of relatively pivoting, the counterweight support frame (400) further comprising a vertical middle support (410) arranged in a vertical direction, the first counterweight support group being pivotally connected to the vertical middle support (410) and being located on one lateral side of the vertical middle support (410), the first counterweight support group, the vertical middle support (410) and the turntable (100) forming a plurality of first parallelogram linkage mechanisms arranged in parallel, the second counterweight support group being pivotally connected to the vertical middle support (410) and being located on the other lateral side of the vertical middle support (410), the second counterweight support group, the vertical middle support (410) and the counterweight frame (300) forming a plurality of second parallelogram linkage mechanisms arranged in parallel; and A push-pull power device (500) is installed on the turntable (100) and connected to the counterweight frame (300); Wherein, during the process of the push-pull power device (500) driving the counterweight frame (300) to expand and retract, the first counterweight bracket group and the second counterweight bracket group pivot relative to each other and enable the counterweight frame (300) to maintain a curved translation.

2. The rear counterweight structure according to claim 1, characterized in that: The first parallelogram linkage mechanism is identical to the second parallelogram linkage mechanism and is symmetrically arranged on both lateral sides of the vertical middle bracket (410).

3. The rear counterweight structure according to claim 2, characterized in that: The vertical middle bracket (410) comprises an upper pivot shaft (411) and a lower pivot shaft (412) arranged below the upper pivot shaft (411); Upper brackets (420) are symmetrically arranged on both lateral sides of the vertical middle bracket (410), and the upper brackets (420) are pivotally connected to the upper pivot shaft (411). Lower brackets (430) are also symmetrically arranged on both lateral sides of the vertical middle bracket (410), and the lower brackets (430) are pivotally connected to the lower pivot shaft (412); The upper bracket (420) and the lower bracket (430) located on one lateral side of the vertical middle bracket (410) form the first counterweight bracket group, and the upper bracket (420) and the lower bracket (430) located on the other lateral side of the vertical middle bracket (410) form the second counterweight bracket group.

4. The rear counterweight structure according to claim 1, characterized in that: The two lateral sides of the end of the turntable (100) extend toward the counterweight frame (300) with locking mechanism mounting ears (110), and the locking mechanism mounting ears (110) are provided with a locking mechanism (600); The counterweight frame (300) is provided with two counterweight frame fixing ear seats (320) extending toward the turntable (100) and arranged at intervals in the transverse direction; When the counterweight frame (300) is retracted to the extreme position, the counterweight frame fixing ear seat (320) is located laterally outside the locking mechanism mounting ear seat (110), and the locking mechanism (600) is used to lock the counterweight frame fixing ear seat (320).

5. The rear counterweight structure according to claim 4, characterized in that: The locking mechanism mounting ear seat (110) is provided with a locking block mounting longitudinal groove (111) and a turntable locking pin hole (112) that transversely passes through the locking block mounting longitudinal groove (111); The counterweight frame fixing ear seat (320) is provided with a counterweight frame supporting pin shaft (321) and a counterweight frame locking pin hole (322); The locking mechanism (600) comprises a locking block (610) arranged in the locking block mounting longitudinal groove (111) and a locking power device (620) connected to the locking block (610); the locking block (610) is provided with a locking block locking pin hole (611) and a counterweight frame supporting pin shaft recess (612) located at the top end; Wherein, when the counterweight frame (300) is retracted to the extreme position, the turntable locking pin hole (112) is coaxial with the counterweight frame locking pin hole (322), and the locking power device (620) can drive the locking block (610) to move, so that the counterweight frame support pin shaft recess (612) is connected with the counterweight frame support pin shaft (321), and the locking block locking pin hole (611) is coaxial with the counterweight frame locking pin hole (322) and the turntable locking pin hole (112).

6. The rear counterweight structure according to claim 5, characterized in that: The locking block (610) is pivotally connected to the locking mechanism mounting ear seat (110), one end of the locking power device (620) is pivotally connected to the bottom end of the turntable (100), and the other end is connected to the bottom end of the locking block (610), and the locking power device (620) drives the locking block (610) to pivot relative to the locking mechanism mounting ear seat (110).

7. The rear counterweight structure according to claim 6, characterized in that: The locking mechanism mounting ear seat (110) further comprises a first locking block limiting plate (113) and a second locking block limiting plate (114) arranged in the locking block mounting longitudinal groove (111), and the locking block (610) swings between the first locking block limiting plate (113) and the second locking block limiting plate (114).

8. The rear counterweight structure according to claim 4, characterized in that: A counterweight frame groove (310) is provided on one side of the counterweight frame (300) close to the turntable (100); the counterweight frame fixing ear seat (320) is located on the inner wall of the counterweight frame groove (310); and a counterweight bracket connecting ear seat group (330) is also provided on the inner wall of the counterweight frame groove (310) and is located between the two counterweight frame fixing ear seats (320); The end of the turntable (100) is also provided with a turntable bracket connecting ear seat group (120) located between the two locking mechanism mounting ear seats (110); When the counterweight frame (300) is retracted to the extreme position, the counterweight support frame (400) is located in the counterweight frame groove (310).

9. The rear counterweight structure according to claim 4, characterized in that: A lifting device (800) is also provided on the lateral outer side of the locking mechanism mounting ear seat (110); when the counterweight frame (300) is retracted to the extreme position, the lifting device (800) is located below the counterweight frame (300).

10. The rear counterweight structure according to claim 1, characterized in that: The crawler crane further comprises an A-frame (200) arranged on the turntable (100), and the rear counterweight structure further comprises a counterweight frame pull plate (700), one end of the counterweight frame pull plate (700) being pivotally connected to the A-frame (200) and the other end being pivotally connected to the counterweight frame (300).

11. The rear counterweight structure according to claim 10, characterized in that: The counterweight frame pull plate (700) is also provided with a sensor for detecting axial force.

12. A crawler crane, characterized in that: The crawler crane comprises the rear counterweight structure according to any one of claims 1 to 11.

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