An inner arm driving structure

Abstract

The utility model discloses an inner arm drive structure, including the loading and unloading arm body, is installed on the loading and unloading arm body and has the inner arm, still include the drive structure of drive inner arm loading and unloading movement, and the drive structure includes the trunnion box of installing on the loading and unloading arm body, and the inner arm is rotatably connected on the trunnion box, the trunnion box is assembled and is connected with the hydraulic drive structure of drive inner arm swing, and the hydraulic drive structure includes the double plunger hydraulic cylinder of fixed mounting in the trunnion box bevel edge position, and the plunger rod of double plunger hydraulic cylinder two ends is installed respectively with the push wheel, still include the steel cable of pulling inner arm, the steel cable is wound on the inner arm in the staggered mode, and the steel cable is pushed through the push wheel, and the free end anchoring of steel cable is set up. Through above -mentioned structure realizes the drive structure of inner arm not only simplifies, and the complexity of loading and unloading arm inner arm's hydraulic system has been reduced. Meanwhile, the simplification on the structure leads to the inner arm space occupation reduction, and in the operation process, the flexibility is higher.

Description

Technical Field

[0001] This utility model belongs to the field of loading and unloading arm technology, and in particular relates to an inner arm drive structure. Background Technology

[0002] Loading and unloading arms, such as marine loading and unloading arms, are specialized equipment mainly used in ports and wharves to connect pipelines with ships for loading and unloading liquids.

[0003] During operation, the loading boom needs to adjust its posture according to the loading and unloading activities to complete the operation. Therefore, the main structure of the loading boom includes an outer boom and an inner boom, which work together to complete the operation. Among them, the inner boom is the part of the loading boom that moves the most during operation, including various movements such as tilting the boom up and down.

[0004] Therefore, the flexibility of the inner boom operation is extremely important. Currently, the drive structure of the inner boom mainly uses a relatively complex hydraulic cylinder system, requiring at least two hydraulic cylinders to achieve tilting or lowering. This results in insufficient flexibility of the inner boom during actual operation, and the hydraulic system becomes more complex to operate.

[0005] Meanwhile, the complex hydraulic system installed on the inner arm structure restricts the spatial position of the inner arm's movements. For example, during the retraction process, the hydraulic system obstructs the space, preventing the inner arm from fully retracting. The retracted posture still occupies a large amount of space, which increases the risk of contact with obstacles in complex environments such as ports and docks due to the obstructed working space. Overall, the flexibility and safety of the operation are relatively low. Utility Model Content

[0006] Based on the above background, the purpose of this utility model is to provide an inner arm drive structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An inner arm drive structure includes a loading and unloading arm body, an inner arm mounted on the loading and unloading arm body, and a drive structure for driving the loading and unloading movement of the inner arm. The drive structure includes a trunnion box mounted on the loading and unloading arm body, and the inner arm is rotatably connected to the trunnion box.

[0009] The trunnion box shown is equipped with a hydraulic drive structure for driving the inner arm to swing. The hydraulic drive structure includes a double-plunger hydraulic cylinder that is fixedly installed at the inclined side of the trunnion box.

[0010] Push rollers are installed on the piston rods at both ends of the double-plunger hydraulic cylinder;

[0011] It also includes a steel cable that pulls the inner arm, the steel cable being wound around the inner arm in an interlaced manner and being pushed by a pusher.

[0012] The free end of the steel cable is anchored.

[0013] Preferably, the inner arm includes an inner arm body and a rope pulley fixedly installed on the inner arm body, wherein the rope pulley is provided with a rope groove for winding a steel cable.

[0014] The pulley is rotatably connected to the trunnion box.

[0015] Preferably, the trunnion box has a bearing mounting groove, a bearing is fixedly installed in the bearing mounting groove, and the rope pulley is fixedly installed on the bearing.

[0016] Preferably, the cylinder barrel of the dual-plunger hydraulic cylinder is obliquely and fixedly mounted on the outer wall of the trunnion box by a cylinder barrel bracket;

[0017] The dual-plunger hydraulic cylinder is inclined and positioned on the outer side of the inner arm.

[0018] Preferably, an inclined mounting seat is welded to the outer wall of the trunnion box, and the cylinder support is fixedly mounted on the inclined mounting seat.

[0019] Preferably, the piston rods at both ends of the dual-plunger hydraulic cylinder are respectively fixedly mounted with a first pusher and a second pusher;

[0020] Both the first pusher and the second pusher include a pusher bracket fixedly mounted on the plunger rod and a wheel body rotatably connected to the pusher bracket;

[0021] The wheel body has a cable groove for limiting the steel cable.

[0022] Preferably, the push wheel bracket is fixedly connected with anti-derailment brackets to prevent the steel cable from derailing. The inner end of the anti-derailment bracket is fixed on the push wheel bracket, and the outer end of the anti-derailment bracket is the anti-derailment end, which is blocked on the outside of the steel cable.

[0023] Preferably, the anti-detachment bracket is L-shaped.

[0024] Preferably, anchor brackets for anchoring steel cables are fixedly connected to both sides of the cylinder support, and the two ends of the steel cables are fixed on the anchor brackets.

[0025] This utility model has the following beneficial effects:

[0026] 1. During operation, the two plunger rods of the dual-plunger hydraulic cylinder work together. For example, when the hydraulic system pumps hydraulic oil into one independent oil chamber, the plunger rod in that chamber extends, pushing the first or second pusher wheel to move. Because the steel cable is wound around the pulley on the inner arm body, the pulley rotates the inner arm body under the pull of the steel cable (at this time, the steel cable on that side is in an unwinding position). Simultaneously, the hydraulic oil in the other oil chamber is drawn back into the hydraulic system (hydraulic tank), at which point the plunger rod on that side retracts, cooperating with the steel cable to wind up. Conversely, when the inner arm body needs to reset or rotate in the opposite direction, the reverse process is followed.

[0027] 2. Through the ingenious structural design described above, a single hydraulic cylinder, in conjunction with a steel cable wound around the inner arm's pulley, enables flexible rotation of the inner arm. This structure simplifies the inner arm's drive mechanism, reducing the complexity of the hydraulic system. Furthermore, the simplified drive structure allows for greater flexibility in adjusting the inner arm's posture during operation. More importantly, the structural simplification reduces the space occupied by the inner arm, resulting in greater flexibility during operation.

[0028] 3. By fixing the dual-plunger hydraulic cylinder to the outside of the trunnion box (i.e., the outside of the inner arm), the inner arm can retract more fully when it is retracted, thus solving the technical defects of the existing technology where the inner arm still occupies a large space after retraction and has low operational flexibility. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the inner arm structure in an embodiment of the present utility model;

[0031] Figure 2 This is a schematic diagram of the trunnion box rotating connecting rope pulley in an embodiment of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the double-plunger hydraulic cylinder tilted on the trunnion box in an embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the installation structure between the double-plunger hydraulic cylinder, push wheel, rope wheel, and steel cable in an embodiment of this utility model;

[0034] Figure 5This is a schematic diagram of the structure of the inner arm mounted on the loading and unloading arm body in an embodiment of this utility model.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0038] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0039] Example 1

[0040] like Figure 1-5 As shown, an inner arm drive structure includes a loading and unloading arm body 7, wherein the loading and unloading arm body 7 is a conventional loading and unloading arm disclosed in the prior art, and its main structure includes an outer arm and an inner arm. The inner arm is installed in the same way as the existing loading and unloading arm. A trunnion box 1 is fixedly installed on the loading and unloading arm body 7, and the inner arm is rotatably connected to the trunnion box.

[0041] Those skilled in the art can learn about the specific structure and working principle of the loading and unloading arm body 7, as well as the inner and outer arms, disclosed in this utility model by consulting technical manuals and dictionaries.

[0042] To increase the flexibility of the inner arm's operation and simplify the hydraulic system that drives the inner arm, this utility model makes the following improvements:

[0043] It also includes a drive structure for driving the loading and unloading movement of the inner arm. The drive structure includes a trunnion box 1 mounted on the loading and unloading arm body 7, and the inner arm is rotatably connected to the trunnion box 1. The specific rotatable connection method is as follows:

[0044] The trunnion housing 1 is equipped with a hydraulic drive structure for driving the inner arm to swing. The hydraulic drive structure includes a double-plunger hydraulic cylinder 2 fixedly installed at the inclined side of the trunnion housing 1. Push wheels are respectively installed on the plunger rods at both ends of the double-plunger hydraulic cylinder 2.

[0045] Specifically, the piston rods at both ends of the dual-plunger hydraulic cylinder 2 are respectively fixedly equipped with a first pusher 21 and a second pusher 22. It also includes a steel cable 3 for pulling the inner arm. The steel cable 3 is wound in a staggered manner around the inner arm on the following rope wheel 5 (i.e., one strand of steel cable 3 is wound around the rope wheel 5 twice, forming two winding sections, which are staggered on the rope wheel 5). The steel cable 3 is pushed by the pusher. The free ends of the steel cable 3 are anchored (specifically, the two free ends of the steel cable 3 are fixed to the cylinder support 24 of the dual-plunger hydraulic cylinder 2, and anchoring brackets 41 for anchoring the steel cable 3 are fixed to both ends of the cylinder support 24).

[0046] Specifically, the inner arm includes an inner arm body 6 and a rope pulley 5 fixedly mounted on the inner arm body 6. The rope pulley 5 has a winding groove for winding the steel cable 3, and the rope pulley 5 is rotatably connected to the trunnion box 1. Similar to existing rotatable connection methods, the trunnion box 1 has a bearing mounting groove, in which a bearing is fixedly mounted, and the rope pulley 5 is fixedly mounted on the bearing (bearing inner ring).

[0047] The aforementioned dual-plunger hydraulic cylinder 2 is a conventional structure disclosed in the prior art, with a single cylinder barrel and two independent oil chambers inside the cylinder barrel, each oil chamber being fitted with a hydraulic rod of a plunger.

[0048] During operation, the two plunger rods of the dual-plunger hydraulic cylinder 2 (model: YGF-220 / 110×107, indicating cylinder diameter / rod diameter × stroke) work together. When the hydraulic circuit system pumps hydraulic oil into an independent oil chamber, the plunger rod in that chamber extends, pushing either the first pusher wheel 21 or the second pusher wheel 22 to move. Because the steel cable 3 is wound around the sheave 5 on the inner arm body 6, the sheave 5 rotates the inner arm body 6 under the pull of the steel cable 3 (at this time, the steel cable 3 on that side is in an unwinding position). Simultaneously, the hydraulic oil in the other oil chamber is drawn back into the hydraulic circuit system (hydraulic oil tank), at which point the plunger rod on that side retracts, cooperating with the steel cable 3 to wind up.

[0049] Conversely, when the inner arm body 6 needs to be reset or rotated in the opposite direction, the reverse working process is followed.

[0050] Through the above ingenious structural design, the inner arm can be flexibly rotated by a single hydraulic cylinder in conjunction with the steel cable 3 wound on the inner arm body 6 pulley 5.

[0051] The aforementioned structure simplifies the drive mechanism of the inner arm, reducing the complexity of the hydraulic system. Simultaneously, due to the complexity of the drive structure, the inner arm offers greater flexibility in adjusting its posture during operation. Furthermore, the structural simplification reduces the space occupied by the inner arm, resulting in greater flexibility during operation.

[0052] The aforementioned dual-plunger hydraulic cylinder 2 employs two independent oil chambers, a conventional method disclosed in the prior art. For example, within the cylinder barrel, two independently operating oil chambers are formed by a partition separating the oil chambers. Those skilled in the art can understand the specific structure and working principle of how a single hydraulic cylinder achieves two independent oil chambers and independent operation of the two plunger rods by consulting technical manuals, dictionaries, and combining general knowledge.

[0053] Similarly, the hydraulic circuit system that pumps oil into two independent oil chambers is also a conventional method disclosed in the prior art.

[0054] Example 2

[0055] like Figure 1-5 As shown, in this embodiment, based on the structure of embodiment 1, in order to further avoid the hydraulic cylinder affecting the retraction posture of the inner arm and forming a spatial obstruction, the double plunger hydraulic cylinder 2 is fixed on the outside of the trunnion box 1 (i.e., the outside of the inner arm), so that the inner arm can retract more fully when it retracts, thus solving the technical defect in the prior art that the inner arm still occupies a large space after retraction.

[0056] Specifically, the cylinder barrel of the double plunger hydraulic cylinder 2 is obliquely fixedly installed on the outer wall of the trunnion box 1 by the cylinder barrel bracket 24; specifically, the double plunger hydraulic cylinder 2 is obliquely set on the outer side of the inner arm.

[0057] The installation method is as follows: an inclined mounting seat 4 is welded to the outer side wall of the trunnion box 1, and the cylinder support 24 is fixedly installed on the inclined mounting seat 4.

[0058] Example 3

[0059] like Figure 1-5 As shown, based on the structure of Embodiment 1, this embodiment improves upon the following to prevent the steel cable 3 from slipping out of the groove, since the steel cable 3 is confined on the first pusher 21 and the second pusher 22:

[0060] Both the first pusher 21 and the second pusher 22 mentioned above include a pusher bracket fixedly installed on the plunger rod and a wheel body rotatably connected to the pusher bracket; a cable groove for limiting the steel cable 3 is provided on the wheel body.

[0061] To further prevent the steel cable 3 from slipping out of the groove, anti-slip brackets 23 are fixedly connected to the aforementioned push wheel brackets. The inner end of the anti-slip bracket 23 is fixed to the push wheel bracket, and the outer end of the anti-slip bracket 23 is the anti-slip end, which blocks the outside of the steel cable 3. The anti-slip bracket 23 is L-shaped.

[0062] The anti-detachment bracket 23 further reduces the risk of the steel cable 3 coming off the groove.

[0063] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An inner arm drive structure, comprising a loading / unloading arm body, an inner arm mounted on the loading / unloading arm body, and a drive structure for driving the loading / unloading movement of the inner arm, characterized in that, The drive structure includes a trunnion box mounted on the loading and unloading arm body, and an inner arm is rotatably connected to the trunnion box. The trunnion box shown is equipped with a hydraulic drive structure for driving the inner arm to swing. The hydraulic drive structure includes a double-plunger hydraulic cylinder that is fixedly installed at the inclined side of the trunnion box. Push rollers are installed on the piston rods at both ends of the double-plunger hydraulic cylinder; It also includes a steel cable that pulls the inner arm, the steel cable being wound around the inner arm in an interlaced manner and being pushed by a pusher. The free end of the steel cable is anchored.

2. The inner arm drive structure according to claim 1, characterized in that, The inner arm includes an inner arm body and a rope wheel fixedly installed on the inner arm body. The rope wheel has a winding groove for winding steel cable. The pulley is rotatably connected to the trunnion box.

3. The inner arm drive structure according to claim 2, characterized in that, The trunnion box is provided with a bearing mounting groove, and a bearing is fixedly installed in the bearing mounting groove. The rope pulley is fixedly installed on the bearing.

4. The inner arm drive structure according to claim 1, characterized in that, The cylinder barrel of the dual-plunger hydraulic cylinder is fixedly mounted on the outer wall of the trunnion box by means of a cylinder barrel bracket. The dual-plunger hydraulic cylinder is inclined and positioned on the outer side of the inner arm.

5. The inner arm drive structure according to claim 4, characterized in that, An inclined mounting base is welded to the outer wall of the trunnion box, and the cylinder support is fixedly mounted on the inclined mounting base.

6. The inner arm drive structure according to claim 1, characterized in that, The piston rods at both ends of the dual-plunger hydraulic cylinder are respectively fixedly mounted with a first push wheel and a second push wheel; Both the first pusher and the second pusher include a pusher bracket fixedly mounted on the plunger rod and a wheel body rotatably connected to the pusher bracket; The wheel body has a cable groove for limiting the steel cable.

7. The inner arm drive structure according to claim 6, characterized in that, The push wheel bracket is fixedly connected with anti-detachment brackets to prevent the steel cable from derailing. The inner end of the anti-detachment bracket is fixed to the push wheel bracket, and the outer end of the anti-detachment bracket is the anti-detachment end, which is blocked on the outside of the steel cable.

8. The inner arm drive structure according to claim 7, characterized in that, The anti-detachment bracket is L-shaped.

9. The inner arm drive structure according to claim 4, characterized in that, Anchor brackets for anchoring steel cables are fixedly connected to both sides of the cylinder support, and the two ends of the steel cables are fixed on the anchor brackets.

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