Wedge block structure and method for improving stress relation between frame and swing leg

Abstract

The invention discloses a wedge block structure for improving the stress relation between a frame and a swing leg, which comprises a wedge-shaped tension device, the wedge-shaped tension device comprises two wedge blocks, the inner side of each wedge block is provided with a threaded hole, the wedge blocks are connected through a long bolt, and the distance between the wedge blocks is adjusted by screwing the long bolt in the threaded holes. The distance between the swing leg and the frame main body structure is reduced by adjusting the screwing-in length of the long bolt between the two wedge-shaped blocks, force on the frame can be dispersed and transmitted to the swing leg structure through the method, and therefore the stress condition of the root of the swing leg, the pin shaft and the shaft hole is effectively improved, and meanwhile the welding seam cracking risk caused by the poor stress condition is reduced.

Description

Technical Field

[0001] The present invention relates to the field of crawler cranes, and in particular to a wedge block structure and method for improving the force relationship between a frame and a swing leg. Background Art

[0002] Crawler cranes, as lifting equipment, are characterized by their high lifting capacity and ability to travel with loads. Currently, there is strong demand in the crawler crane market for variable-gauge crawler cranes. Compared to traditional crawler cranes, these cranes offer advantages such as ease of transport and improved maneuverability. Variable-gauge crawler cranes often use swing legs as the connecting structure between the vehicle frame and the crawler frame. During operation, the swing legs extend to support the vehicle and transmit force to the crawler frame. During transport, the swing legs are retracted to adjust the overall machine size to meet transportation requirements.

[0003] However, the stress conditions of the swing leg structure are harsh. Due to the limitations of processing economy and assembly processability, the traditional swing leg structure often has a large distance from the main frame structure. The swing leg of the variable gauge chassis and the main frame structure are often directly connected by a pin shaft, which seriously affects the transmission of force, causing the pin shaft and the root of the swing leg to become the main load-bearing structure, resulting in stress concentration at the root of the swing leg and the shaft hole, and increasing the risk of weld cracking due to unreasonable stress.

[0004] Therefore, it is necessary to develop a new force-bearing structure between the frame and the swing leg to overcome the above problems. Summary of the Invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the existing technology, the present invention provides a wedge block structure and method for improving the force relationship between the frame and the swing leg. By adjusting the screw-in length of the long bolt between the two wedge blocks, the distance between the swing leg and the main structure of the frame is reduced. Through this method, the force on the frame can be dispersed and transmitted to the swing leg structure, thereby effectively improving the force conditions at the root of the swing leg, the pin shaft and the shaft hole, and at the same time reducing the risk of weld cracking due to poor force conditions.

[0006] Technical solution: The present invention provides a wedge block structure for improving the force relationship between the frame and the swing leg, which is characterized by comprising a wedge-shaped tensioning device, the wedge-shaped tensioning device comprising two wedge blocks, threaded holes being provided on the inner sides of the wedge blocks, the wedge blocks being connected by long bolts, and the distance between the wedge blocks being adjusted by screwing the long bolts into the threaded holes.

[0007] Wherein, the two wedge blocks of the wedge-shaped tensioning device are respectively installed in the gaps between the upper end surfaces of the two swing legs and the upper cover plate of the frame.

[0008] The present invention provides a method for improving the force relationship between a vehicle frame and a swing leg, which is characterized in that: two wedge blocks are respectively installed at the gaps between the upper end surfaces of the two swing legs and the upper cover plate of the frame, and threaded holes are provided on the inner sides of the wedge blocks. The two wedge blocks are connected by using long bolts, and the screw-in length of the long bolts is adjusted to tighten the two wedge blocks, thereby filling the gap between the upper end surface of the swing leg and the upper cover plate of the frame, so that the force on the frame can be transmitted to the swing leg through the structure, thereby improving the force relationship between the frame and the swing leg.

[0009] Among them, the wedge block is used to supplement the gap between the upper end surface of the swing leg and the upper cover plate of the frame. When the swing leg swings to the working position, the wedge block is installed in the gap between the swing leg and the frame and tightened with a long bolt to ensure that the wedge block is in close contact with the frame and the swing leg.

[0010] Wherein, the wedge-shaped tensioning device has its swing leg retracted and fixed on the crawler frame of the crawler crane in the transport state, and the wedge-shaped tensioning device is installed on the swing leg bent plate.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention reduces the distance between the swing leg and the main structure of the frame by adjusting the screw-in length of the long bolt between the two wedge blocks. This method can disperse the force on the frame and transmit it to the swing leg structure, thereby effectively improving the stress conditions at the root of the swing leg, the pin shaft and the shaft hole, while reducing the risk of weld cracking due to poor stress conditions. The present invention has a simple structure, strong operability and good versatility. The wedge block form can adapt to the problem of different spacing caused by processing errors to a certain extent; the structure effectively improves the stress condition of the swing leg, so that the force on the frame can be directly transmitted to the upper cover plate of the swing leg through the structure, reducing the risk of cracking of the swing leg weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a structural schematic diagram of the working state of the present invention;

[0014] Figure 3 It is a structural schematic diagram of the present invention in a non-working state;

[0015] In the figure, 1 is a wedge block; 2 is a long bolt; 3 is a wedge-shaped tensioning device; 4 is a frame; and 5 is a swing leg. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] The wedge-shaped tensioning device of the present invention consists of two wedge-shaped blocks and a long bolt. It is installed in the gap between the swing leg and the frame structure when the crawler crane is in operation. The swing leg, usually a box-shaped structure, is the main connecting component between the frame and the crawler frame when the crawler crane is in operation, responsible for transmitting the force on the frame to the crawler frame.

[0018] Existing variable-gauge crawler crane chassis usually use a pin shaft to directly connect the swing leg to the swing leg seat of the frame. This connection method creates a large gap between the upper end surface of the swing leg and the upper cover plate of the frame, resulting in poor stress conditions for the swing leg and a high risk of cracking in the weld at the root of the swing leg.

[0019] In this regard, Figure 1 、 Figure 2 The wedge block structure of the present invention, used to improve the force relationship between the vehicle frame and the swing leg, includes a wedge-shaped tensioning device 3. The wedge-shaped tensioning device 3 comprises two wedge blocks 1, each having a threaded hole formed inside. The wedge blocks 1 are connected by long bolts 2, and the distance between the wedge blocks 1 is adjusted by screwing the long bolts 2 into the threaded holes. The two wedge blocks 1 of the wedge-shaped tensioning device 3 are respectively installed in the gap between the upper end surfaces of the two swing legs 5 and the upper cover plate of the vehicle frame 4.

[0020] The method for improving the force relationship between the frame and the swing leg of the present invention is as follows: two wedge blocks 1 are respectively installed at the gaps between the upper end surfaces of the two swing legs 5 and the upper cover plate of the frame 4; a threaded hole is opened on the inner side of the wedge block 1; the two wedge blocks 1 are connected by using a long bolt 2, and the screw-in length of the long bolt 2 is adjusted to tighten the two wedge blocks 1, thereby filling the gap between the upper end surface of the swing leg 5 and the upper cover plate of the frame 4, so that the force on the frame 4 can be transmitted to the swing leg 5 through the structure, thereby improving the force relationship between the frame 4 and the swing leg 5.

[0021] This device has a simple structure and is easy to operate. By adjusting the screw-in length of the long bolt 2, the wedge block 1 can be used to fill the gap between the main structure of the frame 4 and the swing leg 5, thereby improving the transmission and distribution of force.

[0022] like Figure 1 , use the wedge block 1 to fill the gap between the upper end surface of the swing leg 5 and the upper cover of the frame 4. When the swing leg 5 swings to the working position, install the wedge block 1 into the gap between the swing leg 5 and the frame 4 and tighten it with the long bolt 2 to ensure that the wedge block 1 is in close contact with the frame 4 and the swing leg 5. Figure 2 This structure is simple and reliable. This structure effectively improves the original situation where only the pin and the root of the swing leg are subjected to concentrated force, so that the force on the frame is more evenly transmitted to the swing leg structure, reducing the risk of weld cracking. Figure 3 When the wedge-shaped tensioning device 3 is in the transport state, the swing leg 5 is retracted and fixed on the crawler frame of the crawler crane, and the wedge-shaped tensioning device 3 is installed to the bent plate of the swing leg 5.

[0023] The present invention reduces the spacing between the swing leg and the main structure of the frame by adjusting the screw-in length of the long bolt between the two wedge-shaped blocks. This method can disperse the force on the frame and transmit it to the swing leg structure, thereby effectively improving the stress conditions at the swing leg root, pin shaft, and shaft hole, while reducing the risk of weld cracking due to poor stress conditions. The present invention has a simple structure, strong operability, and good versatility. The wedge-shaped block form can, to a certain extent, adapt to the problem of different spacing caused by processing errors. This structure effectively improves the stress conditions of the swing leg, allowing the force on the frame to be directly transmitted to the upper cover plate of the swing leg through this structure, reducing the risk of cracking in the swing leg weld.

Claims

1. A wedge-shaped block structure for improving the force relationship between the frame and the swing leg, characterized by: The invention comprises a wedge-shaped tensioning device (3), wherein the wedge-shaped tensioning device (3) comprises two wedge-shaped blocks (1), threaded holes are provided on the inner sides of the wedge-shaped blocks (1), the wedge-shaped blocks (1) are connected by long bolts (2), and the distance between the wedge-shaped blocks (1) is adjusted by screwing the long bolts (2) into the threaded holes.

2. The wedge-shaped block structure for improving the force relationship between the frame and the swing leg according to claim 1, characterized in that: The two wedge-shaped blocks (1) of the wedge-shaped tensioning device (3) are respectively installed in the gaps between the upper end surfaces of the two swing legs (5) and the upper cover plate of the vehicle frame (4).

3. A method for improving the force relationship between the frame and the swing leg, characterized by: Two wedge blocks (1) are respectively installed at the gaps between the upper end surfaces of the two swing legs (5) and the upper cover plate of the vehicle frame (4). A threaded hole is opened on the inner side of the wedge block (1). The two wedge blocks (1) are connected by using a long bolt (2). The screwing length of the long bolt (2) is adjusted to make the two wedge blocks (1) plugged tightly, thereby filling the gap between the upper end surface of the swing leg (5) and the upper cover plate of the vehicle frame (4). The force on the vehicle frame (4) can be transmitted to the swing leg (5) through the structure, thereby improving the force relationship between the vehicle frame (4) and the swing leg (5).

4. The method for improving the force relationship between the frame and the swing leg according to claim 3, characterized in that: The wedge block (1) is used to fill the gap between the upper end surface of the swing leg (5) and the upper cover plate of the vehicle frame (4). When the swing leg (5) swings to the working position, the wedge block (1) is installed in the gap between the swing leg (5) and the vehicle frame (4) and is tightened by the long bolt (2) to ensure that the wedge block (1) is in close contact with the vehicle frame (4) and the swing leg (5).

5. The method for improving the force relationship between the frame and the swing leg according to claim 3, characterized in that: When the wedge-shaped tensioning device (3) is in the transport state, the swing leg (5) is retracted and fixed on the crawler frame of the crawler crane, and the wedge-shaped tensioning device (3) is installed on the bent plate of the swing leg (5).

Images