A displacement balancing weight mechanism

Abstract

A displacing counterweight mechanism relates to the field of engineering machinery, wherein the first-level telescopic mechanism is arranged at the lower part of the counterweight bracket, one end of the swing bracket is connected to the first-level telescopic mechanism, the other end of the swing bracket is connected to the counterweight bracket, and the counterweight block is placed on the counterweight bracket; the present invention drives the swing bracket to swing through the movement of the first-level telescopic mechanism, and the swing bracket drives the counterweight bracket to move together, and the counterweight block is placed on the counterweight bracket, thereby changing the counterweight rotation radius and the center of gravity position; further, a second-level telescopic device can be added between the counterweight bracket and the swing bracket, and the movement of the second-level telescopic device drives the counterweight bracket to further swing, thereby achieving a larger displacement distance; the present invention solves the technical problem of limited counterweight displacement distance, and the tilting performance of the crane is further improved; it also solves the problem of time-consuming and labor-intensive disassembly and assembly of the counterweight bracket in the transfer state, thereby improving efficiency and saving costs.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a displacement balancing weight mechanism. Background Art

[0002] Cranes are widely used in hoisting operations in wind farms, large petrochemical projects, large bridges, and other projects. They are also increasingly being used in urban and factory construction, leading to increasingly demanding crane performance and adaptability. To improve crane lifting performance, counterweights must be added to increase the crane's anti-overturning moment. This increases manufacturing and transportation costs, and more importantly, limits the crane's ability to operate in many confined spaces.

[0003] Currently, the most widely used variable counterweight connected to a turntable is a rotating swing counterweight structure. This structure includes a counterweight bracket, a rotating shaft, a swing cylinder, a rotating frame, and a counterweight block. The left and right rotating frames are connected to the counterweight bracket via a rotating shaft. The left and right swing cylinders are connected to the counterweight bracket and the rotating frame. The left and right counterweight blocks are placed on the rotating frame. Driven by the swing cylinder, the counterweight blocks in this structure can be swung back and forth around the rotating shafts on both sides to change the position of the counterweight. Due to the layout of the rotating frame and the swing cylinder, the swing distance of the left and right rotating frames is limited, and the displacement distance of the counterweight is limited, which restricts further improvement of the crane's tilting performance. The transfer state is restricted by factors such as the width of the road and the width of the transport vehicle. The counterweight block and the entire structure of the counterweight bracket connected to the turntable in the above solution must be removed, which is time-consuming and labor-intensive, reducing the operating efficiency of the crane. Summary of the Invention

[0004] In order to solve the existing technical difficulties of using as little counterweight as possible to maximize lifting performance and adapt to more narrow working spaces, the present invention designs a counterweight displacement mechanism and method, which can reduce the weight of the counterweight and the slewing radius of the crane under the same conditions to adapt to operations in narrow spaces.

[0005] A shifting counterweight mechanism comprises a counterweight bracket, a first-stage telescopic mechanism, a swing bracket, a counterweight support and a counterweight block;

[0006] The first-stage telescopic mechanism is arranged at the lower part of the counterweight bracket, one end of the swing bracket is connected to the first-stage telescopic mechanism, and the other end of the swing bracket is connected to the counterweight bracket, and the counterweight block is placed on the counterweight bracket;

[0007] The counterweight bracket includes a counterweight bracket body, a slide rail fixing device is fixedly provided at one end of the bottom surface of the counterweight bracket body, a shifting slide rail is fixedly provided on the slide rail fixing device, a telescopic device mounting hole is provided on the slide rail fixing device, the shifting slide rail is nested and connected with the slider in the first-level telescopic mechanism; the telescopic device mounting hole is connected to the telescopic device fixed shaft in the first-level telescopic mechanism;

[0008] The first-stage telescopic mechanism includes two sliders, a telescopic device, a telescopic device fixed shaft, and two swing bracket connecting shafts. The telescopic device fixed shaft is arranged in the middle of the telescopic device, the two swing bracket connecting shafts are arranged at both ends of the telescopic device, and the two sliders are fixedly arranged on the sides of the two swing bracket connecting shafts; the telescopic device fixed shaft is connected to the telescopic device mounting hole for fixing the telescopic device; the swing bracket connecting shaft is connected to the swing bracket to transmit the power provided by the telescopic device to the swing bracket;

[0009] The swing bracket is composed of a first swing bracket body, a second swing bracket body, and a centering connection block. The centering connection block connects the first swing bracket body and the second swing bracket body together. The first swing bracket body and the second swing bracket body are both provided with a first connection hole at the same side end, and the second swing bracket body and the second swing bracket body are provided with a second connection hole and a third connection hole at the other side end; the first connection hole is connected to the swing bracket connecting shaft; the second connection hole is connected to the secondary telescopic device; the third connection hole is connected to the counterweight bracket; the centering connection block is connected to the centering slide rail to prevent the mechanism from eccentric movement;

[0010] The counterweight bracket comprises a counterweight bracket body, a first connecting shaft and a second connecting shaft. The first connecting shaft and the second connecting shaft are arranged on the same side of the counterweight bracket body, and the first connecting shaft is connected to the swing bracket.

[0011] A secondary telescopic device is arranged between the counterweight bracket and the swing bracket, one end of the swing bracket is connected to the primary telescopic mechanism, the other end of the swing bracket is respectively connected to the secondary telescopic device and the counterweight bracket, the other end of the secondary telescopic device is connected to the other end of the counterweight bracket, the counterweight block is placed on the counterweight bracket, and the second connecting shaft is the secondary telescopic device.

[0012] The first-level telescopic mechanism and the second-level telescopic device are oil cylinders.

[0013] The first-level telescopic mechanism is a double oil cylinder.

[0014] A centering slide rail is provided in the middle of the bottom surface of the counterweight support body, and the centering slide rail is connected to the swing support to prevent the swing support from eccentric movement;

[0015] The displacement slide rail is a linear rail or a circular rail.

[0016] The swing bracket is arranged in a left-right manner or an up-down manner.

[0017] The ends of the first swing bracket body and the second swing bracket body where the second connecting hole and the third connecting hole are opened are single-layer board or multi-layer board structures.

[0018] The working process and working principle of the present invention:

[0019] The present invention uses a primary telescopic mechanism to drive the swing bracket to swing, which in turn drives the counterweight bracket to move with it. The counterweight is placed on the counterweight bracket, thereby changing the counterweight's rotation radius and center of gravity. Furthermore, a secondary telescopic device can be added between the counterweight bracket and the swing bracket. This secondary telescopic device can further drive the counterweight bracket to swing, achieving a greater displacement distance.

[0020] The movement of the telescopic device in the primary telescopic mechanism drives the slider to slide back and forth on the counterweight bracket. This movement of the slider drives the swing bracket to swing. At this time, the secondary telescopic device, the counterweight bracket, the counterweight block, and the swing bracket swing together to achieve the swing displacement of the counterweight block. After the swing displacement is completed, the movement of the secondary telescopic device drives the counterweight bracket to swing, achieving further displacement of the counterweight block.

[0021] The method of changing the balance weight in working state is as follows:

[0022] Before work begins, the counterweight system is in the first position, at which point the primary telescopic mechanism is in a fully extended state and the secondary telescopic device is in an initial state.

[0023] At the start of operation, the primary telescopic mechanism retracts, driving the swing bracket to swing toward the rear of the counterweight bracket. At this point, the secondary telescopic mechanism, counterweight bracket, and counterweight block swing together with the swing bracket. When the primary telescopic mechanism reaches full retraction, the counterweight system swings to the second position, achieving the swing shift of the counterweight system. Once in the second position, the secondary telescopic mechanism extends, pushing the counterweight bracket to continue swinging toward the rear of the counterweight bracket. When the secondary telescopic mechanism reaches full extension, the counterweight system swings to the third position, achieving further shifting of the counterweight system. The reverse sequence can be used to swing the counterweight system from the third position to the first position.

[0024] The method of changing the balance weight in transition state is as follows:

[0025] Before starting work, remove the counterweight blocks from the counterweight system. If the counterweight system is in the first position, move it to the second position using the counterweight shifting method described above for the working state. If it is in the second or third position, move it directly to the transition state.

[0026] Beneficial effects of the present invention:

[0027] 1. The present invention solves the technical problem of limited displacement distance of the counterweight, and the tilting performance of the crane is further improved.

[0028] 2. The present invention solves the problem of time-consuming and labor-intensive disassembly and assembly of the counterweight bracket during transfer, thereby improving efficiency and saving costs.

[0029] Crane: A multi-action machine that lifts heavy objects vertically and moves them horizontally within a certain range.

[0030] Turntable: The structural component on the crane used for the rotation of the upper vehicle, and is the main force-bearing structure when the crane is lifting.

[0031] Counterweight: Installed at the tail of the turntable, it is mainly used to balance the tipping moment generated when the crane is lifting weights, and maintain the stability of the entire machine.

[0032] Center of gravity position: The position of the center of gravity of the counterweight relative to the center of rotation directly affects the overturning moment of the crane.

[0033] Distance of displacement: the distance that the center of gravity of the balance weight changes.

[0034] Turning radius: The distance between the farthest point of the counterweight and the turntable's rotation axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention.

[0036] Figure 2 Schematic diagram of the structure of the counterweight bracket according to an embodiment of the present invention.

[0037] Figure 3 Schematic diagram of the structure of the first-stage telescopic mechanism according to an embodiment of the present invention.

[0038] Figure 4 Schematic diagram of the structure of the swing bracket according to an embodiment of the present invention.

[0039] Figure 5 Schematic diagram of the structure of a counterweight bracket according to an embodiment of the present invention.

[0040] Figure 6 This is a structural schematic diagram of a counterweight system in a first position according to an embodiment of the present invention.

[0041] Figure 7 This is a structural diagram of the counterweight system in the second position according to an embodiment of the present invention.

[0042] Figure 8 This is a structural diagram of the counterweight system of an embodiment of the present invention located at the third position.

[0043] Figure 9This is a structural diagram of the counterweight system of an embodiment of the present invention at the fourth position DETAILED DESCRIPTION

[0044] See also Figures 1 to 9 Shown is an embodiment of the present invention.

[0045] A shifting counterweight mechanism, comprising a counterweight bracket 1, a primary telescopic mechanism 2, a swing bracket 3, a secondary telescopic device 4, a counterweight bracket 5 and a counterweight block 6;

[0046] The counterweight bracket 1 is the basic structure connecting the counterweight system and the turntable. The primary telescopic mechanism 2 is set at the lower part of the counterweight bracket 1. One end of the swing bracket 3 is connected to the primary telescopic mechanism 2. The other end of the swing bracket 3 is connected to the secondary telescopic device 4 and the counterweight bracket 5 respectively. The other end of the secondary telescopic device 4 is connected to the other end of the counterweight bracket 5. The counterweight block 6 is placed on the counterweight bracket 5.

[0047] The counterweight support 1 includes a counterweight support body 11, a centering slide rail 12 is provided in the middle of the bottom surface of the counterweight support body 11, a side plate 13 is fixedly provided at one end of the bottom surface of the counterweight support body 11, a shifting slide rail 14 is fixedly provided on the side plate 13, and a telescopic device mounting hole 15 is provided on the side plate 13. The shifting slide rail 14 is nested and connected with the slider 21 in the first-level telescopic mechanism 2; the telescopic device mounting hole 15 is connected to the telescopic device fixed shaft 23 in the first-level telescopic mechanism 2; the centering slide rail 12 is connected to the swing support 3 to prevent the swing support 3 from eccentric movement;

[0048] The first-level telescopic mechanism 2 includes two sliders 21, a telescopic device 22, a telescopic device fixed shaft 23 and two swing bracket connecting shafts 24. The telescopic device fixed shaft 23 is arranged in the middle of the telescopic device 22, and the two swing bracket connecting shafts 24 are arranged at both ends of the telescopic device 22. The two sliders 21 are respectively fixed on the sides of the two swing bracket connecting shafts 24; the telescopic device fixed shaft 23 is connected to the telescopic device mounting hole 12 for fixing the telescopic device 22; the swing bracket connecting shaft 24 is connected to the swing bracket 3 to transmit the power provided by the telescopic device 22 to the swing bracket 3, thereby realizing the swing displacement of the counterweight system; the slider 21 is connected to the displacement slide rail 14 and can slide relative to each other; the telescopic device 22 is the power mechanism of the displacement counterweight system and provides power for the displacement of the counterweight system;

[0049] The swing bracket 3 is X-shaped and consists of a first swing bracket body 31, a second swing bracket body 32, and a centering connection block 33. The centering connection block 33 superimposes the first swing bracket body 31 and the second swing bracket body 32 together. The first swing bracket body 31 and the second swing bracket body 32 have a first connection hole 34 on the same side end, and a second connection hole 35 and a third connection hole 36 on the other side end of the first swing bracket body 31 and the second swing bracket body 32; the first connection hole 34 is connected to the swing bracket connecting shaft 24; the second connection hole 35 is connected to the secondary telescopic device 4; the third connection hole 36 is connected to the counterweight bracket 5; the centering connection block 33 is connected to the centering slide rail 12 to prevent the mechanism from eccentric movement

[0050] The counterweight bracket 5 includes a counterweight bracket body 51, a first connecting shaft 52 and a second connecting shaft 53. The first connecting shaft 52 and the second connecting shaft 53 are arranged on the same side of the counterweight bracket body 51. The first connecting shaft 52 and the second connecting shaft 53 are respectively connected to the swing bracket 3 and the secondary telescopic device 4.

[0051] The first-stage telescopic mechanism 2 and the second-stage telescopic device 4 are oil cylinders.

[0052] The shifting slide rail 14 is a linear rail.

[0053] The swing bracket 3 is arranged in left and right directions.

[0054] The ends of the first swing bracket body 31 and the second swing bracket body 32 where the second connection hole 35 and the third connection hole 36 are opened are multi-layer board structures.

[0055] The working process and working principle of this embodiment:

[0056] The movement of the telescopic device 22 in the primary telescopic mechanism 2 drives the slider 21 to slide back and forth on the counterweight bracket 1. The sliding of the slider 21 drives the swing bracket 3 to swing. At this time, the secondary telescopic device 4, the counterweight bracket 5, and the counterweight 6 swing together with the swing bracket 3 to achieve the swing displacement of the counterweight 6. After the swing displacement is completed, the movement of the secondary telescopic device 4 drives the counterweight bracket 5 to swing, achieving further displacement of the counterweight 6.

[0057] The method of changing the balance weight in working state is as follows:

[0058] Before the start of work, the counterweight system is in the first position, at which time the first-stage telescopic mechanism 2 is in a fully extended state, and the second-stage telescopic device 4 is in an initial state.

[0059] At the start of operation, the primary telescopic mechanism 2 retracts, driving the swing bracket 3 to swing toward the rear of the counterweight bracket 1. At this point, the secondary telescopic device 4, counterweight bracket 5, and counterweight block 6 swing together with the swing bracket 3. When the primary telescopic mechanism 2 reaches its fully retracted state, the counterweight system swings to its second position, achieving the swing displacement of the counterweight system. After reaching the second position, the secondary telescopic device 4 begins to extend, pushing the counterweight bracket 5 to continue swinging toward the rear of the counterweight bracket 1. When the secondary telescopic device 4 reaches its fully extended state, the counterweight system swings to its third position, achieving further displacement of the counterweight system. The counterweight system can be swung from the third position to the first position by following the reverse sequence.

[0060] The method of changing the balance weight in transition state is as follows:

[0061] Before starting work, remove the counterweight block 6 in the counterweight system. If the counterweight system is in the first position, shift the counterweight system to the second position according to the above working state counterweight shifting method; if it is in the second position / third position, it can be directly shifted to the transition state.

[0062] At the beginning of work, the first-level telescopic mechanism 2 is fixed, and the second-level telescopic device 4 retracts, pushing the counterweight bracket 5 to swing toward the front side of the counterweight bracket 1. When the second-level telescopic device 4 reaches the fully retracted state, the counterweight system swings to the fourth position. At this time, the width of the counterweight system meets the road driving requirements, realizing the transition state displacement of the counterweight system.

[0063] The counterweight system can be swung from the fourth position to the previous position in the reverse order.

Claims

1. A displacement counterweight mechanism, characterized in that: It includes a counterweight bracket (1), a first-stage telescopic mechanism (2), a swing bracket (3), a counterweight bracket (5) and a counterweight block (6); The first-stage telescopic mechanism (2) is arranged at the lower part of the counterweight bracket (1), one end of the swing bracket (3) is connected to the first-stage telescopic mechanism (2), the other end of the swing bracket (3) is connected to the counterweight bracket (5), and the counterweight block (6) is placed on the counterweight bracket (5); The counterweight bracket (1) includes a counterweight bracket body (11), a slide rail fixing device (13) is fixedly provided at one end of the bottom surface of the counterweight bracket body (11), a shifting slide rail (14) is fixedly provided on the slide rail fixing device (13), a telescopic device mounting hole (15) is provided on the slide rail fixing device (13), the shifting slide rail (14) is nested and connected with a slider (21) in the first-level telescopic mechanism (2); the telescopic device mounting hole (15) is connected with the telescopic device fixing shaft (23) in the first-level telescopic mechanism (2); The first-stage telescopic mechanism (2) includes two sliders (21), a telescopic device (22), a telescopic device fixing shaft (23) and two swing bracket connecting shafts (24), wherein the telescopic device fixing shaft (23) is arranged in the middle of the telescopic device (22), the two swing bracket connecting shafts (24) are arranged at both ends of the telescopic device (22), and the two sliders (21) are fixedly arranged on the side surfaces of the two swing bracket connecting shafts (24); the telescopic device fixing shaft (23) is connected to the telescopic device mounting hole (12) for fixing the telescopic device (22); the swing bracket connecting shaft (24) is connected to the swing bracket (3) for transmitting the power provided by the telescopic device (22) to the swing bracket (3); The swing bracket (3) is composed of a first swing bracket body (31), a second swing bracket body (32), and a centering connection block (33). The centering connection block (33) connects the first swing bracket body (31) and the second swing bracket body (32) together. The first swing bracket body (31) and the second swing bracket body (32) have a first connection hole (34) at the same side end, and a second connection hole (35) and a third connection hole (36) are formed at the other side end of the first swing bracket body (31) and the second swing bracket body (32). The first connection hole (34) is connected to the swing bracket connecting shaft (24); the second connection hole (35) is connected to the secondary telescopic device (4); the third connection hole (36) is connected to the counterweight bracket (5); the centering connection block (33) is connected to the centering slide rail (12) to prevent the mechanism from performing eccentric movement. The counterweight bracket (5) comprises a counterweight bracket body (51), a first connecting shaft (52) and a second connecting shaft (53), wherein the first connecting shaft (52) and the second connecting shaft (53) are arranged on the same side of the counterweight bracket body (51), and the first connecting shaft (52) is connected to the swing bracket (3).

2. A displacement counterweight mechanism according to claim 1, characterized in that: A secondary telescopic device (4) is provided between the counterweight bracket (5) and the swing bracket (3), one end of the swing bracket (3) is connected to the primary telescopic mechanism (2), the other end of the swing bracket (3) is connected to the secondary telescopic device (4) and the counterweight bracket (5), the other end of the secondary telescopic device (4) is connected to the other end of the counterweight bracket (5), the counterweight block (6) is placed on the counterweight bracket (5), and the second connecting shaft (53) is connected to the secondary telescopic device (4).

3. The shifting counterweight mechanism according to claim 2, characterized in that: The first-stage telescopic mechanism (2) and the second-stage telescopic device (4) are oil cylinders.

4. The shifting counterweight mechanism according to claim 1, characterized in that: The first-stage telescopic mechanism (2) is a double oil cylinder.

5. The shifting counterweight mechanism according to claim 1, characterized in that: A centering slide rail (12) is provided in the middle of the bottom surface of the counterweight bracket body (11), and the centering slide rail (12) is connected to the swing bracket (3) to prevent the swing bracket (3) from eccentric movement.

6. The shifting counterweight mechanism according to claim 1, characterized in that: The shifting slide rail (14) is a linear rail or a circular rail.

7. The shifting counterweight mechanism according to claim 1, characterized in that: The swing bracket (3) is arranged in a left-right manner or an up-down manner.

8. The shifting counterweight mechanism according to claim 1, characterized in that: One end of the first swing bracket body (31) and the second swing bracket body (32) where the second connection hole (35) and the third connection hole (36) are opened is a single-layer board or a multi-layer board structure.

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