Auxiliary tool for overhauling rotary joint of unloading arm

Abstract

The utility model belongs to the technical field of petrochemical engineering, and discloses an auxiliary tool for overhauling a rotary joint of a discharging arm, which comprises a hoisting component and a clamping and fixing component, and is fixed above a steel frame body through a supporting piece and positioned above the rotary joint to form a stable hoisting fulcrum; the position of the hoisting piece can be flexibly adjusted along the supporting piece so as to adapt to the actual position of a hoisting hole of the rotary joint, the rotary joint is prevented from deviating in the disassembly and assembly process, the risk of equipment damage is reduced, and it can be ensured that the rotary joint is always kept at the correct centering position; meanwhile, the first fixing piece is fixed to the steel frame body and can be connected with a second fixing block on the steel frame in a clamped mode, and a stable datum point is formed; the length, penetrating out of the first fixing piece, of the second fixing piece can be adjusted, so that the position of the inner arm or the outer arm is locked, displacement and even falling of the inner arm or the outer arm in the dismounting and mounting process are prevented, the centering precision and the assembling precision are improved, and the overhauling efficiency and the overhauling quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of petroleum chemical industry especially relates to a kind of unloading arm swivel joint overhauling auxiliary tooling. BACKGROUND

[0002] The floating production storage and offloading device is a kind of floating production system for offshore oil and gas field development, which integrates oil and gas production, storage, processing and transportation functions, and is widely used in the exploitation of far sea or ultra-deep water oil fields. The unloading arm is an important part of the floating production storage and offloading device, which can unload the stored crude oil to the equipment of tanker or other transportation device. The unloading arm includes a swivel joint, which is mainly installed on a dedicated offloading platform. There is a fluid passage inside the swivel joint for transporting crude oil, natural gas or cooling medium to ensure smooth unloading process without leakage. The swivel joint allows the unloading arm to rotate in multiple directions to adapt to the relative movement between the floating production storage and offloading device and the unloading ship, avoiding damage caused by rigid connection. Since the swivel joint is in a harsh marine environment for a long time and needs to withstand high mechanical stress and medium pressure, regular maintenance of the swivel joint is required.

[0003] As shown in Figure 1 When overhauling the swivel joint of the unloading arm, the lifting hole and fixing block provided on the unloading arm are usually used to lift and disassemble the swivel joint. However, this method has many problems, such as the lifting hole position of the unloading arm deviating, causing the swivel joint to shift during disassembly, thereby damaging the equipment; the centering accuracy is insufficient during installation, making it difficult to ensure the correct position of the swivel joint and the unloading arm, affecting the assembly accuracy; in addition, the bolt holes of the inner and outer arm fixing blocks of the unloading arm are offset, making it difficult to securely fix the unloading arm, increasing the installation difficulty and affecting the operation safety. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of unloading arm swivel joint overhauling auxiliary tooling, can adjust lifting position according to the actual position of swivel joint lifting hole, ensure that swivel joint does not shift during disassembly, can also ensure the centering accuracy of swivel joint and the inner and outer arms of unloading arm, effectively fix the position of inner and outer arms of unloading arm, prevent its shift to increase the installation difficulty of swivel joint, improve assembly accuracy, improve maintenance efficiency and improve maintenance quality.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The unloading arm rotary joint maintenance auxiliary tool, the unloading arm includes a steel frame body, an inner arm, an outer arm and a rotary joint, the inner arm and the outer arm are respectively arranged on both sides of the steel frame body, and are respectively connected with the rotary joint flange, the inner arm and the outer arm are provided with a first fixed block, the steel frame body is provided with a second fixed block, the first fixed block and the second fixed block are opposite in position, wherein the unloading arm rotary joint maintenance auxiliary tool further comprises:

[0007] The lifting assembly comprises a support and a lifting piece, the support is arranged above the rotary joint and is detachably fixedly connected with the steel frame body, and is used for supporting the lifting piece; the lifting piece can be displaced along the support towards the steel frame body or away from the steel frame body, and is used for lifting the rotary joint.

[0008] The clamping and fixing assembly comprises a first fixing piece and a second fixing piece, the first fixing piece is detachably fixed to the steel frame body and can be clamped with the second fixed block on the steel frame body; the second fixing piece is arranged on one side of the first fixing piece, one end of the second fixing piece is slidably penetrated through the top end of the first fixing piece, and the other end can be clamped with the second fixed block and the first fixing piece; the second fixing piece can adjust and lock the length of the second fixing piece penetrating through the first fixing piece, so as to limit the displacement of the inner arm and / or the outer arm relative to the steel frame body.

[0009] Further, the first fixing piece comprises a fixed frame, a support frame and a fixed plate, the support frame is arranged on the top of the fixed frame, the outer edge of the second fixing piece on one side of the support frame protrudes outward from the outer edge of the fixed frame, the second fixing piece is slidably penetrated through the support frame, and the fixed plate is detachably fixed to one side of the fixed frame facing the steel frame body and connected with the steel frame body; the fixed frame is matched with the shape of the second fixed block and can be sleeved on the second fixed block.

[0010] Further, the second fixing piece comprises a first limiting portion and a locking rod, the first limiting portion is arranged at a position close to the bottom of the fixed frame and can be clamped with the bottom of the fixed frame and the bottom of the first fixed block, one end of the locking rod away from the first limiting portion penetrates through the support frame, and the locking rod can adjust and lock the length of the locking rod penetrating through the support frame, so as to fix the relative position of the first fixed block and the fixed frame.

[0011] Further, the locking rod comprises a locking rod body and a bolt, the locking rod body is arranged on one side of the fixed frame, the top end of the locking rod body penetrates through the support frame, the locking rod is provided with an external thread, and the bolt is threadedly connected with the locking rod body and can abut against the top end of the support frame.

[0012] Further, the locking rod is provided with a second limiting part, the second limiting part is arranged on the threaded bottom, the second limiting part can abut against the support frame to limit the axial displacement of the locking rod.

[0013] Further, the fixed frame bottom is provided with a third limiting part, one end of the first limiting part can pass through the third limiting part and be clamped with the fixed frame bottom, the first limiting part can move axially in the third limiting part to limit the axial displacement distance of the first limiting part.

[0014] Further, the support includes a cross bar, the cross bar is arranged above the rotary joint and is detachably fixed to the steel frame body, a plurality of positioning holes are arranged on the cross bar, the positioning holes are arranged at intervals along the length direction of the cross bar, and the hoisting member is selectively arranged in any positioning hole.

[0015] Further, the support further includes a reinforcing rib, the reinforcing rib is connected at an angle with the cross bar and the steel frame body.

[0016] Further, one end of the cross bar close to the steel frame body is provided with a fastener, the fastener is connected with the steel frame body to fasten the cross bar and the steel frame body.

[0017] Further, the hoisting member includes a hand-operated hoist, the hand-operated hoist is selectively arranged in any positioning hole and is connected with the rotary joint.

[0018] The utility model discloses the beneficial effect:

[0019] The utility model provides a kind of unloading arm rotary joint overhauling auxiliary tool, and it is fixed in the upper portion of steel frame body and located the upper portion of rotary joint by support piece, forms stable lifting fulcrum;Lifting piece can be flexibly adjusted position along support piece, to adapt to the actual position of rotary joint lifting hole, to ensure that hoisting process is more accurate, avoid the deviation of rotary joint in dismounting process, reduce the risk of equipment damage;At the same time, first fixed part is fixed with steel frame body, and can be connected with the second fixed block on steel frame, forms a stable reference point;Second fixed piece can adjust the length of its passing through first fixed piece, to lock the position of inner arm or outer arm, prevent its displacement even drop in dismounting process.In regular maintenance to rotary joint, the auxiliary tool is detachably connected with steel frame body and the inner arm or outer arm of unloading arm, installation is convenient, easy to operate.Before overhauling, operator can quickly fix tool to unloading arm, and through the cooperation of lifting assembly and clamping fixed assembly, so that lifting assembly can accurately butt joint the lifting hole of rotary joint, and ensure that rotary joint always remains in correct centering position.In addition, clamping fixed assembly can effectively prevent the displacement of inner arm or outer arm due to uneven stress, so that dismounting and overhauling process are more smooth, improve centering accuracy and assembly accuracy, improve overhauling efficiency and overhauling quality.After overhauling is completed, the tool can be quickly disassembled, without affecting the normal operation of unloading arm. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the outer arm of unloading arm and steel frame body connection schematic diagram in prior art;

[0021] Figure 2 It is the lifting assembly structure schematic diagram in the utility model;

[0022] Figure 3 It is the clamping fixed assembly structure schematic diagram in the utility model.

[0023] In the drawing:

[0024] 100, rotary joint;200, steel frame body;300, outer arm;400, first fixed block;500, second fixed block;

[0025] 1, lifting assembly;11, support piece;111, cross bar;112, positioning hole;113, reinforcing rib;12, lifting piece;

[0026] 2, clamping fixed assembly;21, first fixed part;211, fixed frame;212, support frame;213, fixed plate;214, third limiting portion;22, second fixed piece;221, first limiting portion;222, locking rod;2221, locking rod body;2222, bolt;2223, second limiting portion. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0028] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0031] Please refer to Figures 1 to 3The utility model provides a kind of unloading arm rotary joint overhauling auxiliary tool, can be according to the actual position of rotary joint 100 hoisting hole, adjust hoisting position, ensure that rotary joint 100 does not occur deviation in the process of disassembly and assembly, it can simultaneously ensure the centring accuracy of rotary joint 100 and the inner arm or outer arm 300 of unloading arm, effectively fix the position of unloading arm inner arm or outer arm 300, prevent its deviation increase the installation difficulty of rotary joint 100, improve assembly accuracy, improve overhauling efficiency, improve overhauling quality.Unloading arm includes steel frame body 200, inner arm, outer arm 300 and rotary joint 100, inner arm or outer arm 300 is located at steel frame body 200 both sides respectively, and all is connected with the flange of rotary joint 100, and first fixed block 400 is all equipped on inner arm or outer arm 300, second fixed block 500 is equipped on steel frame body 200, and the position of first fixed block 400 and second fixed block 500 is opposite;Unloading arm rotary joint overhauling auxiliary tool includes hoisting assembly 1 and clamping fixed assembly 2, hoisting assembly 1 includes support piece 11 and hoisting piece 12, support piece 11 is located above rotary joint 100, and is detachably fixed with steel frame body 200, for supporting hoisting piece 12;Hoisting piece 12 can be displaced along support piece 11 towards the direction of approaching or away from steel frame body 200, for hoisting rotary joint 100;Clamping fixed assembly 2 includes first fixed piece 21 and second fixed piece 22, first fixed piece 21 is detachably fixed on steel frame body 200, and can be engaged with second fixed block 500 on steel frame body 200;Second fixed piece 22 is located at one side of first fixed piece 21, one end of second fixed piece 22 can be slidably penetrated in the top end of first fixed piece 21, and the other end can be engaged with second fixed block 500 and first fixed piece 21, second fixed piece 22 can adjust and lock the length of its penetration first fixed piece 21, to limit the displacement of inner arm and / or outer arm 300 relative to steel frame body 200.

[0032] The discharging arm rotary joint maintenance auxiliary tool is fixed above the steel frame body 200 and above the rotary joint 100 through the support 11, forming a stable hoisting fulcrum; the hoisting piece 12 can be flexibly adjusted in position along the support 11 to adapt to the actual position of the hoisting hole of the rotary joint 100, so as to ensure that the hoisting process is more accurate, avoid the rotary joint 100 from being offset during disassembly and assembly, and reduce the risk of equipment damage; at the same time, the first fixing piece 21 is fixed with the steel frame body 200 and can be clamped with the second fixing block 500 on the steel frame, forming a stable reference point; the second fixing piece 22 can adjust the length of the first fixing piece 21, so as to lock the position of the inner arm or the outer arm 300, preventing it from being displaced or even falling off during disassembly and assembly. When the rotary joint 100 is regularly maintained, the auxiliary tool is detachably connected with the steel frame body 200 and the inner arm or the outer arm 300 of the discharging arm, and is convenient to install and easy to operate. Before maintenance, the operator can quickly fix the tool to the discharging arm, and through the cooperation of the hoisting assembly 1 and the clamping and fixing assembly 2, the hoisting assembly 1 can be accurately connected with the hoisting hole of the rotary joint 100, and the rotary joint 100 can always be kept in the correct centering position. In addition, the clamping and fixing assembly 2 clamps the first fixing block 400 on the inner arm or the outer arm 300 through the second fixing piece 22 and clamps the second fixing block 500 on the steel frame body 200 through the first fixing piece 21, and locks and fixes the two, so as to realize the relative clamping and fixing of the inner arm or the outer arm 300 and the steel frame body 200, which can effectively prevent the inner arm or the outer arm 300 from being offset due to uneven force, so that the disassembly and maintenance process is more smooth, the centering accuracy and assembly accuracy are improved, and the maintenance efficiency and quality are improved. After the maintenance is completed, the tool can be quickly disassembled, without affecting the normal operation of the discharging arm.

[0033] As Figure 3As shown, in order to improve the stability of the first fixing part 21, in some embodiments, the first fixing part 21 comprises a fixing frame 211, a supporting frame 212 and a fixing plate 213, the supporting frame 212 is arranged at the top of the fixing frame 211, the outer edge of the supporting frame 212 facing the second fixing part 22 protrudes outward from the outer edge of the fixing frame 211, the second fixing part 22 can be slidably penetrated through the supporting frame 212, the fixing plate 213 is detachably fixed to the side of the fixing frame 211 facing the steel frame body 200 and connected with the steel frame body 200; the fixing frame 211 is matched in shape with the second fixing block 500 and can be sleeved on the second fixing block 500; wherein, by matching the shape of the fixing frame 211 with the second fixing block 500, the sleeve can be fixed, which ensures that the clamping and fixing assembly 2 can be quickly and accurately docked with the second fixing block 500 during installation, reduces assembly errors and ensures that the clamping and fixing assembly 2 forms a stable connection with the steel frame body 200; the fixing plate 213 can be connected with the steel frame body 200 by bolts, so that the first fixing part 21 is more stable in connection with the steel frame body 200; the supporting frame 212 is arranged at the top of the fixing frame 211 and protrudes outward from the outer edge of the fixing frame 211, avoiding installation position conflicts, so that the second fixing part 22 can be more stably slid and locked, preventing the deformation or stress failure of the fixing part.

[0034] Further, the second fixing part 22 comprises a first limiting part 221 and a locking rod 222, the first limiting part 221 is arranged at the position close to the bottom of the fixing frame 211 of the locking rod 222 and can be clamped with the bottom of the fixing frame 211 and the bottom of the first fixing block 400, the end of the locking rod 222 away from the first limiting part 221 penetrates through the supporting frame 212, the locking rod 222 can adjust and lock the length penetrating out of the supporting frame 212 to fix the relative position of the first fixing block 400 and the fixing frame 211; wherein, by arranging the first limiting part 221 at the position close to the bottom of the fixing frame 211 of the locking rod 222, it means that when the locking rod 222 is inserted into the supporting frame 212, by adjusting the length of the locking rod 222, it can adapt to different unloading arm tolerances or installation requirements, so that the inner arm or the outer arm 300 can be reliably fixed under different working conditions, the first limiting part 221 can be in contact with the bottom of the fixing frame 211 and the bottom of the first fixing block 400 at the same time, clamped with each other, forming a stable positioning reference; since the first fixing block 400 is arranged on the inner arm or the outer arm 300 respectively, and the second fixing block 500 is arranged on the steel frame body 200, the first and second positioning blocks are opposite in position, the clamping action of the first limiting part 221 can ensure that the first fixing block 400 and the second fixing block 500 always maintain a corresponding relationship and do not deviate in position.

[0035] In order to improve the adjustability of the locking rod 222, in some embodiments, the locking rod 222 comprises a locking rod body 2221 and a bolt 2222, the locking rod body 2221 is arranged on one side of the fixed frame 211, the top end penetrates the support frame 212, the locking rod 222 is provided with external threads, the bolt 2222 is threadedly connected with the locking rod body 2221 and can abut against the top end of the support frame 212; wherein, by providing external threads on the locking rod body 2221, the position of the threaded adjusting bolt 2222 is adjusted, the extension length of the locking rod body 2221 is controlled, and the fixing position is accurately adjusted; when the bolt 2222 is tightened to the top end of the support frame 212, a locking limiting mechanism is formed, which can prevent the locking rod 222 from loosening due to vibration or external force, and ensure long-term reliable fixing effect.

[0036] In order to improve the stability of the locking rod 222, in some embodiments, the locking rod 222 is provided with a second limiting portion 2223, the second limiting portion 2223 is arranged at the bottom of the thread, and the second limiting portion 2223 can abut against the support frame 212 to limit the axial displacement of the locking rod 222; wherein, by providing the second limiting portion 2223 at the bottom of the thread, it can be ensured that the locking rod 222 will not be pulled out of the support frame 212 due to excessive rotation during the adjustment of the bolt 2222, and the stability of the locking rod 222 is improved. It should be noted that the second limiting portion 2223 can be but is not limited to a limiting protrusion, which is not limited here.

[0037] In order to prevent the first fixing member 21 and the second fixing member 22 from separating or falling off during disassembly, in some embodiments, the bottom of the fixed frame 211 is provided with a third limiting portion 214, one end of the first limiting portion 221 can penetrate the third limiting portion 214 and be clamped with the bottom of the fixed frame 211, and the first limiting portion 221 can move axially in the third limiting portion 214 along the locking rod 222 to limit the axial displacement distance of the first limiting portion 221; wherein, by providing the third limiting portion 214, the third limiting portion 214 provides a limiting channel, so that the first limiting portion 221 can penetrate therein and move axially along the locking rod 222 and be clamped with the bottom of the fixed frame 211, which ensures that it will not easily slide out, while allowing limited axial adjustment of the first limiting portion 221, ensuring that the first limiting portion 221 can move within a certain range, but will not completely separate from the fixed frame 211, thereby maintaining the connection relationship between the fixing members, thereby simplifying the installation and disassembly process, so that the operator does not need to worry about the loosening of the components, and the work efficiency is improved.

[0038] As Figure 2As shown, in order to flexibly adjust the hoisting piece 12, in some embodiments, the support piece 11 comprises a crossbar 111 which is arranged above the rotary joint 100 and is detachably fixed on the steel frame body 200, a plurality of positioning holes 112 are arranged on the crossbar 111, and the plurality of positioning holes 112 are arranged along the length direction of the crossbar 111, and the hoisting piece 12 can be selectively arranged in any positioning hole 112; wherein, by arranging the crossbar 111 above the rotary joint 100 and detachably fixing it on the steel frame body 200, the position of the crossbar 111 can be flexibly adjusted or the crossbar 111 can be replaced under different working conditions, so as to adapt to different types of rotary joints 100; a plurality of positioning holes 112 are arranged on the crossbar 111, and the plurality of positioning holes 112 are arranged along the length direction of the crossbar 111, so that the operator can select the appropriate positioning hole 112 according to the actual hoisting hole position of the rotary joint 100, thereby avoiding installation deviation caused by mismatching of the hoisting point, and ensuring that the rotary joint 100 is always in the correct position.

[0039] In order to enhance the strength of the support piece 11, in some embodiments, the support piece 11 further comprises a reinforcing rib 113 which is connected at an angle with the crossbar 111 and the steel frame body 200; wherein, by designing the reinforcing rib 113 to be inclined and connecting the crossbar 111 and the steel frame body 200, a triangular support structure is formed, effectively dispersing stress through three support surfaces, avoiding the problem of excessive local stress, improving bending and torsional resistance, effectively dispersing load, and ensuring the stability of the structure.

[0040] In order to improve the connection firmness, in some embodiments, one end of the crossbar 111 close to the steel frame body 200 is provided with a fastener which is connected with the steel frame body 200 to fasten the crossbar 111 and the steel frame body 200; wherein, by providing the fastener at one end of the crossbar 111 close to the steel frame body 200, the connection between the crossbar 111 and the steel frame body 200 can be effectively fixed, avoiding loosening or deviation of the crossbar 111 due to external force during hoisting, and the fastener ensures the stable connection between the crossbar 111 and the steel frame body 200, thereby improving the firmness of the overall structure.

[0041] Optionally, the fastener can be but is not limited to a clamp structure and a bolt, the clamp structure is arranged at one end of the crossbar 111 close to the steel frame body 200 and can be arranged around the steel frame body 200, and the bolt can fix the clamp structure with the steel frame body 200; in this way, the crossbar 111 and the steel frame body 200 can be quickly connected, the clamp is fixed by using the bolt, and quick fixing or dismounting can be achieved, thereby saving installation time and operation complexity.

[0042] In order to improve the hoisting precision, in some embodiments, the hoisting piece 12 comprises a hand chain block, which is selectively arranged in any positioning hole 112 and connected with the rotary joint 100; wherein the hand chain block is selectively arranged in any positioning hole 112, and different positioning holes 112 provide multiple choices, so that the hoisting operation is more flexible, and the hoisting point can be adjusted according to the specific position of the rotary joint 100; in addition, the hand chain block is connected with the rotary joint 100, the precise control of the movement of the hand chain block can realize the precise hoisting of the rotary joint 100, and the control ability of the hand chain block makes the hoisting process more precise, which helps to ensure that the rotary joint 100 is always in the correct position during the installation and disassembly process.

[0043] In other embodiments, the hoisting piece 12 can also be but not limited to an electric chain block, which is not limited here.

[0044] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A maintenance auxiliary tool for a discharge arm rotary joint, the discharge arm comprising a steel frame body (200), an inner arm and an outer arm (300), the inner arm and the outer arm (300) being respectively arranged on both sides of the steel frame body (200) and being respectively connected with a flange of the rotary joint (100), the inner arm and the outer arm (300) being respectively provided with a first fixing block (400), the steel frame body (200) being provided with a second fixing block (500), the first fixing block (400) and the second fixing block (500) being opposite to each other, characterized in that, The unloading arm rotary joint maintenance auxiliary tool further comprises: The lifting assembly (1) comprises a support (11) and a lifting piece (12), the support (11) is arranged above the rotary joint (100) and is detachably fixedly connected with the steel frame body (200) to support the lifting piece (12); the lifting piece (12) can be displaced along the support (11) towards the steel frame body (200) or away from the steel frame body (200) to lift the rotary joint (100); The clamping and fixing assembly (2) comprises a first fixing piece (21) and a second fixing piece (22), the first fixing piece (21) is detachably fixed to the steel frame body (200) and can be clamped with the second fixing block (500) on the steel frame body (200); the second fixing piece (22) is arranged on one side of the first fixing piece (21), one end of the second fixing piece (22) is slidably penetrated through the top end of the first fixing piece (21), and the other end can be clamped with the second fixing block (500) and the first fixing piece (21); the second fixing piece (22) can adjust and lock the length of the second fixing piece (22) penetrating through the first fixing piece (21) to limit the displacement of the inner arm and / or the outer arm (300) relative to the steel frame body (200).

2. The swing joint servicing aid for a discharge arm according to claim 1, characterized in that The first fixing piece (21) comprises a fixing frame (211), a support frame (212) and a fixing plate (213), the support frame (212) is arranged on the top of the fixing frame (211), the outer edge of the side of the support frame (212) facing the second fixing piece (22) protrudes outward from the outer edge of the fixing frame (211), the second fixing piece (22) is slidably penetrated through the support frame (212), and the fixing plate (213) is detachably fixed to the side of the fixing frame (211) facing the steel frame body (200) and connected with the steel frame body (200); the fixing frame (211) is matched in shape with the second fixing block (500) and can be sleeved on the second fixing block (500).

3. The swing joint servicing aid for a discharge arm according to claim 2, characterized in that The second fixing piece (22) comprises a first limiting portion (221) and a locking rod (222), the first limiting portion (221) is arranged at a position close to the bottom of the fixing frame (211) of the locking rod (222) and can be clamped with the bottom of the fixing frame (211) and the bottom of the first fixing block (400), one end of the locking rod (222) away from the first limiting portion (221) is penetrated through the support frame (212), and the locking rod (222) can adjust and lock the length of the locking rod (222) penetrating through the support frame (212) to fix the relative position of the first fixing block (400) and the fixing frame (211).

4. The swing joint servicing aid of claim 3, wherein, The locking rod (222) comprises a locking rod body (2221) and a bolt (2222), the locking rod body (2221) is arranged on one side of the fixed frame (211), the top end of the locking rod body (2221) penetrates the support frame (212), the locking rod (222) is provided with external threads, and the bolt (2222) is threadedly connected with the locking rod body (2221) and can abut against the top end of the support frame (212).

5. The swing joint servicing aid for a discharge arm according to claim 4, characterized in that The locking rod (222) is provided with a second limiting portion (2223), the second limiting portion (2223) is arranged at the bottom of the thread, and the second limiting portion (2223) can abut against the support frame (212) to limit the axial displacement of the locking rod (222).

6. The swing joint servicing aid for a discharge arm according to claim 5, characterized in that The bottom of the fixed frame (211) is provided with a third limiting portion (214), one end of the first limiting portion (221) can penetrate the third limiting portion (214) and be clamped with the bottom of the fixed frame (211), and the first limiting portion (221) can move axially in the third limiting portion (214) along the locking rod (222) to limit the axial displacement distance of the first limiting portion (221).

7. The swing joint servicing aid for a discharge arm according to claim 1, characterized in that The support member (11) comprises a cross rod (111), the cross rod (111) is arranged above the rotary joint (100) and is detachably fixed to the steel frame body (200), a plurality of positioning holes (112) are formed in the cross rod (111), the plurality of positioning holes (112) are arranged at intervals along the length direction of the cross rod (111), and the hoisting member (12) is selectively arranged in any positioning hole (112).

8. The swing joint servicing aid for a discharge arm according to claim 7, characterized in that The support member (11) further comprises a reinforcing rib (113), the reinforcing rib (113) is connected at an angle with the cross rod (111) and the steel frame body (200).

9. The swing joint servicing aid for a discharge arm according to claim 8, characterized in that One end of the cross rod (111) close to the steel frame body (200) is provided with a fastener, the fastener is connected with the steel frame body (200) to fasten the cross rod (111) and the steel frame body (200).

10. The swing joint servicing aid for a discharge arm according to claim 9, characterized in that The hoisting member (12) comprises a hand-operated hoist, the hand-operated hoist is selectively arranged in any positioning hole (112) and is connected with the rotary joint (100).

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