A local box type arm head structure, a limiting device and a lifting arm

Abstract

The utility model relates to a kind of local box type arm head structure, limiting device and hoist arm, the local box type arm head structure contains and is set in the local box type device in the left and right sides of upper vertical plate each;The box type device is the rectangular box body structure spliced into by upper vertical plate, cylinder reinforcing plate, upper seal plate, lower seal plate, rear seal plate and side seal plate;The limiting device contains arm head backing plate installed on upper vertical plate, several adjusting washers, stop block, fastening screw and top screw thread plate, and the buffer block sleeved on the stop block;The hoist arm is equipped with above-mentioned local box type arm head structure and local box type arm head limiting device.The utility model sets up box type structure in the local part of single board arm head, so that hoist arm head structure has both the load capacity of box type arm head and can also consider light weight level.

Description

Technical Field

[0001] This utility model relates to a partial box-shaped boom head structure, a limiting device, and a lifting boom, belonging to the field of crane technology. Background Technology

[0002] A crane boom is a telescopic, box-shaped boom structure used for lifting on a crane. It consists of multiple boom sections assembled together, and its extension and retraction are achieved through internal cylinders and a rope mechanism. A double-cylinder, rope-driven five-section crane boom consists of a base boom, second-section boom, third-section boom, fourth-section boom, fifth-section boom, and a telescopic mechanism (located inside the boom). See [link / details]. Figure 1 The boom head is a crucial component of each boom section, located at the very front of the main boom structure. It is used for assembling and securing the boom head's telescopic slider, baffles, and other components. It also acts as a limit stop when the boom section is retracted to its extreme position. Furthermore, when all boom sections are fully retracted, the boom head bears the load, transmitting the load from the preceding boom section. However, due to the significant impact force during boom retraction, the boom head is frequently subject to damage.

[0003] Currently, boom heads mainly come in two structural forms: box-type and single-plate.

[0004] 1. Box-type boom head structure: such as Figure 3 As shown, there are two upright plates at the front and rear, and top and bottom, with internal supporting ribs. The centering plate below the boom head, together with the front lower upright plate, the rear lower upright plate, and the supporting ribs, forms a closed box-shaped structure. The boom head itself has a limiting function; the main structure of the boom section, in conjunction with the stop blocks, pads, and adjusting shims of the rear boom section, plays a limiting role. Threaded plates are welded to the top and sides of the box-shaped boom head for fixing accessories such as telescopic sliders and baffles. The front and rear upright plates of the box-shaped boom head contain multiple reinforcing ribs and have side sealing plates on both sides, providing strong load-bearing and deformation resistance. It can withstand large impacts and will not crack or deform under long-term loads and collisions.

[0005] 2. Single-board arm head structure: such as Figure 2 As shown, it is composed of an upper vertical plate 303 and a lower vertical plate 304 welded together, and also includes a limit block 301, a centering plate 302, an upper top screw threaded plate 306, and a side top screw threaded plate 305, etc., for assembling and fixing the telescopic slider, and its function is the same as that of the box-type boom head. The single-plate boom head has a simple structure and is lighter than the box-type boom head. However, the limit block of the single-plate boom head is only connected to the lower vertical plate of the boom head and the contact part of the boom cylinder body through welds, and its load-bearing and impact resistance is lower than that of the box-type boom head. When the two-section boom is in the extended state and about to retract to the fully retracted state, the telescopic cylinder I drives the two-section boom to generate a large impact. In addition, due to various reasons, such as poor sealing, the telescopic cylinder will still pop out a small distance after fully retracting, and the actual number of adjusting shims between the boom sections will be more than the design requirements, further increasing the impact load between the boom sections.

[0006] Existing box-type boom heads have high strength and rigidity, strong load-bearing capacity, and will not crack or deform under long-term load and impact. However, they account for a large proportion of structural weight, have a low level of lightweighting, and have a small overlap ratio between adjacent boom sections. On the other hand, single-plate boom heads have a simple structure and a high level of lightweighting, but poor load-bearing and impact resistance. When the boom is subjected to harsh working conditions and improper operation for a long time, problems such as cracking of the weld at the connection between the limit block and the cylinder, deformation and cracking of the base material below the cylinder may occur.

[0007] Patent CN204324761U discloses a single-plate boom head structure and a lifting boom. The single-plate boom head structure includes an upper vertical plate and a lower vertical plate, with the vertical plates inserted into the cylinder and welded to the cylinder front and rear. Centering plates are provided at both the upper and lower parts of the boom head structure to prevent torsion between adjacent cylinder sections. A limit block is provided below the boom head for mechanical limiting when the boom section is retracted to its limit state. The lifting boom includes the aforementioned single-plate boom head structure. This technical solution simplifies the overall weight of the boom head structure, increases the overlap ratio of each telescopic boom section, and improves the lifting performance of the lifting boom, while ensuring the fixation of components such as sliders and baffles. However, this single-plate boom head structure is simple and has poor load-bearing and impact resistance. In particular, the limit block is only connected by a weld at the contact point between the cylinder and the boom head. Under harsh, heavy-load conditions or improper boom retraction, problems such as weld cracking at the connection between the limit block and the cylinder or deformation of the base material below the cylinder may occur.

[0008] In response to the aforementioned problems with the boom head, there is an urgent need for a new type of boom head structure and lifting boom to resolve the contradiction between having the load-bearing capacity of a box-type boom head and achieving a lightweight design. Summary of the Invention

[0009] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a partial box-shaped boom head structure, a limiting device and a lifting boom. By setting a box-shaped structure in a part of the single-plate boom head, the lifting boom head structure can have both the load-bearing capacity of a box-shaped boom head and a lightweight level.

[0010] The purpose of this utility model is achieved as follows:

[0011] A partial box-shaped boom head structure includes an upper upright plate and a lower upright plate installed on the boom head, with a box-shaped device partially installed on each of the left and right sides of the upper upright plate; the box-shaped device is a rectangular box structure spliced ​​from the upper upright plate, a cylindrical reinforcing plate, an upper sealing plate, a lower sealing plate, a rear sealing plate, and a side sealing plate; the upper upright plate and the cylindrical reinforcing plate are both welded to the boom cylinder.

[0012] Furthermore, a reinforcing rib is connected between the upper upright plate and the rear sealing plate.

[0013] Furthermore, the cylinder reinforcing plate has a stepped structure, with its inner end face flush with the process hole of the lifting arm cylinder, and its outer end face protruding from the cylinder and extending to the outer surface of the cylinder.

[0014] Furthermore, observation holes are provided on both the side sealing plate and the rear sealing plate; and water leakage holes are provided at the connection points of the upper sealing plate, the lower sealing plate, the side sealing plate, and the rear sealing plate.

[0015] Furthermore, the bottom of the lower plate is provided with an insert-type limiting block and a centering plate; the limiting block includes a limiting plate with a stepped structure and a transition curved plate provided on the upper part of the limiting plate.

[0016] Furthermore, the outer arc of the transition plate contacts the stepped surface of the limiting plate, and the inner arc matches the outer circle of the lifting boom cylinder.

[0017] A partial box-type boom head limiting device includes a boom head pad plate, several adjusting shims, a stop block, fastening screws, and a set screw threaded plate mounted on an upper upright plate, as well as a buffer block fitted on the stop block; the boom head pad plate, several adjusting shims, and the stop block are sequentially stacked and fixed on the upper upright plate by fastening screws; an adjusting bolt is screwed into the threaded hole of the set screw threaded plate to tighten the side of the buffer block.

[0018] Furthermore, the buffer block is made of metal-reinforced rubber, and a square process hole is provided on one side of the buffer block for nesting on the stop block.

[0019] A partially box-shaped boom lifting arm is provided, which is equipped with any of the aforementioned partially box-shaped boom head structures and any of the aforementioned partially box-shaped boom head limiting devices; wherein, the partially box-shaped boom head limiting devices and the box-shaped device are respectively located on the left and right sides of the upper upright plate, and the fastening screws are screwed onto the upper upright plate and extend into the inner cavity of the box-shaped device.

[0020] Furthermore, the partial box-shaped boom head is a five-section boom with double cylinders and ropes, and the rear sealing plate of the box-shaped device of the front boom section contacts the front end face of the buffer block of the rear boom section.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] The partial box-shaped boom head structure of this utility model, without changing the original boom head spacing, adds box-shaped devices to the left and right sides, so that the main structure of the boom section has high strength and rigidity. It has both the load-bearing capacity of the box-shaped boom head and the lightweight level, reducing the risk of deformation and cracking, and solving the problems of insufficient strength and poor impact resistance of the existing limit blocks.

[0023] The partial box-shaped boom head limiting device of this utility model cooperates with the partial box-shaped boom head structure to realize the limiting function between the booms. It has the load-bearing capacity of the box-shaped boom head while taking into account the level of lightweight, reducing the risk of deformation and cracking, and at the same time solving the problems of insufficient strength and poor impact resistance of existing limiting blocks.

[0024] The partially box-shaped boom of this utility model, by installing the partially box-shaped boom structure and the partially box-shaped boom limiting device on the front and rear sides of the upper plate of the single-plate boom respectively, achieves a buffer protection function when the boom section is retracted from the extended state to the fully retracted state. At the same time, the boom section has both the load-bearing capacity of the box-shaped boom and the lightweight level, which effectively solves the contradiction between the load-bearing capacity and the lightweight level of the boom. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the existing double-cylinder rope conveyor boom head limiting system.

[0026] Figure 2 This is a schematic diagram of a single-board arm head structure in the prior art.

[0027] Figure 3 This is a schematic diagram of a box-type boom head structure in the prior art.

[0028] Figure 4 This is a schematic diagram of a partial box-shaped arm head structure according to the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of a partial box-shaped arm head limiting device of this utility model.

[0030] Figure 6 This is a schematic diagram of the structure of a partial box-shaped arm head limiting device of this utility model.

[0031] Figure 7 This is a schematic diagram of the structure of a partially box-shaped boom of the present invention.

[0032] in:

[0033] One-section arm 1, two-section arm 2, three-section arm 3, four-section arm 4, five-section arm 5;

[0034] Box-type device 300, limiting block 301, centering plate 302, upper upright plate 303, lower upright plate 304, side top screw threaded plate 305, upper top screw threaded plate 306, top screw threaded plate 307, cylinder reinforcing plate 308, upper sealing plate 309, reinforcing rib plate 310, lower sealing plate 311, rear sealing plate 312, side sealing plate 313, observation hole 314;

[0035] Limiting plate 3011, transition bending plate 3012;

[0036] 51. Arm head pad, 52. Adjusting shim I, 53. Adjusting shim II, 54. Adjusting shim III, 55. Stop block, 56. Spring washer, 57. Fastening screw, 58. Buffer block, 59. Adjusting bolt. Detailed Implementation Example 1

[0037] See Figure 4 The present invention relates to a partial box-shaped boom head structure, comprising an upper upright plate 303 and a lower upright plate 304 installed on the boom head, and a box-shaped device 300 partially provided on the left and right sides of the upper upright plate 303; the box-shaped device 300 is a rectangular box structure formed by welding together the upper upright plate 303, the cylindrical reinforcing plate 308, the upper sealing plate 309, the lower sealing plate 311, the rear sealing plate 312, and the side sealing plate 313.

[0038] Specifically, the upper plate 303 serves as the front sealing plate of the box structure. Both the upper plate 303 and the cylindrical reinforcing plate 308 are welded to the boom cylinder. The cylindrical reinforcing plate 308 has a stepped structure, with its inner end face flush with the process hole of the boom cylinder and its outer end face protruding from the cylinder and extending to the outer surface of the cylinder, increasing the contact area with the cylinder, dispersing stress, and avoiding stress concentration at the connection point. A reinforcing rib plate 310 is connected between the upper plate 303 and the rear sealing plate 312 to further improve the structural strength. During welding, the upper sealing plate 309, the lower sealing plate 311, and the reinforcing rib plate 310 are first connected to the cylindrical reinforcing plate 308 and the upper plate 303 respectively through welds. Finally, the rear sealing plate 312 and the side sealing plate 313 are welded.

[0039] The bottom of the lower support plate 304 is provided with an insert-type limiting block 301 and a centering plate 302. The limiting block 301 includes a limiting plate 3011 with a stepped structure and a transition curved plate 3012 disposed on the upper part of the limiting plate 3011. The outer arc of the transition curved plate 3012 contacts the surface of the limiting plate 3011, and the inner arc matches the outer circle of the crane boom cylinder. The transition curved plate 3012 has a square hole. At the same time, the limiting plate 3011 has a step, and the outer arc of the transition curved plate 3012 contacts the stepped surface of the limiting plate 3011, improving the adaptability of the contact surface and evenly distributing stress. The limiting block 301 is strengthened by changing the original limiting block to an insert-type structure and adding a transition curved plate 3012 above the limiting plate 3011 to improve its own load-bearing capacity and reduce stress concentration at the contact position with the cylinder.

[0040] Both the side sealing plate 313 and the rear sealing plate 312 have observation holes 314 for periodic inspection of the quality of the internal welds of the box-type structure during later use; the upper sealing plate 309, the lower sealing plate 311, the side sealing plate 313, the reinforcing rib plate 310 and the rear sealing plate 312 are all provided with drainage holes to drain water in time and reduce the risk of corrosion of the semi-enclosed box-type structure.

[0041] The partial box-shaped boom head structure of this embodiment, without changing the original boom head spacing, adds box-shaped devices 300 on the left and right sides, so that the main structure of the boom section has high strength and rigidity. It has both the load-bearing capacity of the box-shaped boom head and the lightweight level, reducing the risk of deformation and cracking, and solving the problems of insufficient strength and poor impact resistance of the existing limit blocks. Example 2

[0042] See Figures 5-6 This utility model relates to a partial box-type arm head limiting device, comprising an arm head pad 51, several adjusting shims, a stop block 55, a fastening screw 57, and a set screw threaded plate 307 mounted on an upper upright plate 303, and a buffer block 58 fitted on the stop block 55; the arm head pad 51, several adjusting shims, and the stop block 55 are sequentially stacked and fixed on the upper upright plate 303 by fastening screws 57 and spring washers 56; an adjusting bolt 59 is screwed into the threaded hole of the set screw threaded plate 307 to tighten the side of the buffer block 58;

[0043] The adjusting shims include adjusting shim I 52, adjusting shim II 53, and adjusting shim III 54. The appropriate number of adjusting shims is selected according to the required adjustment distance. The buffer block 58 is made of metal-reinforced rubber, which has high strength, fatigue resistance, and impact resistance, and can better withstand impact and cyclic loads. A square process hole is provided on one side of the buffer block 58 for nesting on the stop block 55. It is located at the front end of the fastening screw 57 and the stop block 55 of this arm section, and plays a buffering and protective role when a certain arm section is retracted from the extended state to the fully retracted state.

[0044] When the buffer block 58 needs to be replaced, simply loosen the adjusting bolt 59; there is no need to remove the fastening screw 57, making the operation easier.

[0045] The partial box-shaped boom head limiting device of this embodiment cooperates with the partial box-shaped boom head structure of Embodiment 1 to achieve the limiting function between the booms. It has the load-bearing capacity of the box-shaped boom head while also taking into account the level of lightweighting, reducing the risk of deformation and cracking, and solving the problems of insufficient strength and poor impact resistance of the existing limiting blocks. Example 3

[0046] See Figure 7This utility model relates to a partially box-shaped boom, which is a five-section boom with double cylinder ropes and is equipped with the partially box-shaped boom head structure of Embodiment 1 and the partially box-shaped boom head limiting device of Embodiment 2. The partially box-shaped boom head limiting device and the box-shaped device 300 are respectively located on the left and right sides of the upper upright plate 303, and the fastening screws 57 are screwed on the upper upright plate 303 and extend into the inner cavity of the box-shaped device 300. The installation status of the fastening screws 57 inside the box can be observed through the observation holes 314 on the side sealing plate 313 and the rear sealing plate 312. Between two adjacent boom sections, the rear sealing plate 312 of the box-shaped device 300 of the previous boom section contacts the front end face of the buffer block 58 of the subsequent boom section, which plays a buffering and protective role when the previous boom section is retracted from the extended state to the fully retracted state.

[0047] In actual fully retracted boom configurations, the distance between boom heads (the horizontal distance between the front end face of the boom head of the current boom section and the front end face of the boom head of the preceding boom section) is usually greater than the theoretical design value. Therefore, the number of adjusting shims II 53 or III 54 is increased to adjust the distance between boom heads, ensuring that the rear sealing plate 312 of the side box-shaped device 300 of the current boom section contacts the front end face of the buffer block 58 of the following boom section. This allows the side box-shaped structure and the buffer block 58 to jointly provide limiting and load-bearing functions. Figure 7 As shown, the arm head limiting system consists of a basic arm and a two-section arm.

[0048] In this embodiment, the partially box-shaped boom head is equipped with the partially box-shaped boom head structure and the partially box-shaped boom head limiting device installed on the front and rear sides of the upper plate 303 of the single-plate boom. The two work together to provide buffer protection when the boom section is retracted from the extended state to the fully retracted state. At the same time, the boom section head has both the load-bearing capacity of the box-shaped boom head and the lightweight level, which effectively solves the contradiction between the load-bearing capacity and the lightweight level of the boom head, and has good economic and social benefits.

[0049] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A partial box-shaped boom head structure, comprising an upper upright plate (303) and a lower upright plate (304) mounted on the boom head, characterized in that: A box-shaped device (300) is partially installed on each of the left and right sides of the upper upright plate (303); the box-shaped device (300) is a rectangular box structure spliced ​​together by the upper upright plate (303), the cylindrical reinforcing plate (308), the upper sealing plate (309), the lower sealing plate (311), the rear sealing plate (312) and the side sealing plate (313); the upper upright plate (303) and the cylindrical reinforcing plate (308) are both welded to the boom cylinder.

2. The partial box-shaped arm head structure according to claim 1, characterized in that: A reinforcing rib (310) is connected between the upper upright plate (303) and the rear sealing plate (312).

3. The partial box-shaped arm head structure according to claim 1, characterized in that: The cylinder reinforcing plate (308) has a stepped structure, with its inner end face flush with the process hole of the lifting arm cylinder and its outer end face protruding from the cylinder and extending to the outer surface of the cylinder.

4. The partial box-shaped arm head structure according to claim 1, characterized in that: Observation holes (314) are provided on both the side sealing plate (313) and the rear sealing plate (312); water leakage holes are provided at the connection between the upper sealing plate (309), the lower sealing plate (311), the side sealing plate (313) and the rear sealing plate (312).

5. The partial box-shaped arm head structure according to claim 1, characterized in that: The bottom of the lower plate (304) is provided with a plate-type limiting block (301) and a centering plate (302); the limiting block (301) includes a limiting plate (3011) with a stepped structure and a transition bending plate (3012) provided on the upper part of the limiting plate (3011).

6. The partial box-shaped arm head structure according to claim 5, characterized in that: The outer arc of the transition bend plate (3012) contacts the step surface of the limiting plate (3011), and the inner arc matches the outer circle of the lifting boom cylinder.

7. A partial box-type arm head limiting device, characterized in that: It includes an arm head pad (51), several adjusting shims, a stop block (55), a fastening screw (57), and a set screw thread plate (307) mounted on the upper plate (303), as well as a buffer block (58) fitted on the stop block (55); the arm head pad (51), several adjusting shims, and the stop block (55) are stacked and fixed on the upper plate (303) in sequence by fastening screws (57); an adjusting bolt (59) is screwed into the threaded hole of the set screw thread plate (307) to tighten the side of the buffer block (58).

8. The partial box-type arm head limiting device according to claim 7, characterized in that: The buffer block (58) is made of metal-reinforced rubber, and a square process hole is provided on one side of the buffer block (58) for nesting on the stop block (55).

9. A partially box-shaped boom lifting arm, characterized in that: The device is equipped with any one of the partial box-shaped boom head structures of claims 1 to 6, and the partial box-shaped boom head limiting device of claim 7 or 8; wherein the partial box-shaped boom head limiting device and the box-shaped device (300) are respectively disposed on the left and right sides of the upper upright plate (303), and the fastening screw (57) is screwed on the upper upright plate (303) and extends into the inner cavity of the box-shaped device (300).

10. The partially box-type boom head crane boom according to claim 9 is a five-section double-cylinder rope-driven boom, characterized in that: The rear end plate (312) of the box-shaped device (300) of the front arm contacts the front end face of the buffer block (58) of the rear arm.

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