A tower crane jib welding aid

Abstract

The application discloses a tower crane jib welding auxiliary device and relates to the technical field of hoisting machinery manufacturing. The device comprises a mobile base, a mounting plate fixedly arranged on the surface of the mobile base, a fixing frame fixedly arranged on the side of the mounting plate away from the mobile base, a jib fixedly arranged on the top of the fixing frame, and a supporting device. The supporting device comprises a carrying pipe, a sliding rod, a connecting frame, a hollow pipe, a supporting leg, a first spring and a handle. The carrying pipe is fixedly penetrated through the surface of the fixing frame. The sliding rod is slidingly arranged on the inner wall of the carrying pipe. The connecting frame is fixedly arranged on the side of the sliding rod close to the jib. The hollow pipe is fixedly arranged on the bottom of the connecting frame. The position of the connecting frame can be quickly adjusted, the position of the connecting frame for providing support for the jib can be flexibly changed, and the stability of the jib itself is enhanced in the welding process.

Description

Technical Field

[0001] This invention relates to the field of lifting machinery manufacturing technology, specifically to a welding auxiliary device for the boom of a tower crane. Background Technology

[0002] The welding auxiliary device for tower crane booms consists of a support device, a positioning device, and a welding platform.

[0003] Patent publication number CN212122230U relates to a welding auxiliary device for a tower crane boom, comprising a boom, an active seat, and a driven seat. The boom is mounted on the active and driven seats, and several fixed plates are welded and fixed to the boom. Clamping components for clamping the fixed plates are welded to both the active and driven seats. A first turntable is fixedly connected to the output end of a rotary motor via a first coupling shaft, and the first turntable is also fixedly connected to the clamping components, so that the rotary motor drives the first turntable to rotate the boom. A second turntable is fixedly connected to the clamping components, so that the boom drives the second turntable to rotate. This tower crane boom welding auxiliary device uses clamping components to fix the boom in place, and then uses two rotating components to drive the boom to rotate, or uses two lifting components to drive the boom to adjust its position up and down, making the boom welding more convenient and improving the welding quality.

[0004] The aforementioned patent has the effect of improving welding quality. The lifting arm can be rotated by two rotating components, and the lifting arm can be adjusted up and down by two lifting components, making the welding of the lifting arm more convenient. However, in actual operation, the two sides of the lifting arm are usually fixedly supported. This support method results in insufficient support force at the center position of the lifting arm. Therefore, during the welding process, the center position of the lifting arm is prone to shaking or shifting, which will have an adverse effect on the welding quality. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a welding auxiliary device for the boom of a tower crane, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tower crane boom welding auxiliary device, comprising a movable base, an mounting plate fixedly mounted on the surface of the movable base, a fixed frame fixedly mounted on the side of the mounting plate away from the movable base, a boom fixedly mounted on the top of the fixed frame, and a support device; wherein, the support device comprises a mounting tube, a sliding rod, a connecting frame, a hollow tube, a support foot, a first spring, and a handle, the support foot compressing the first spring during movement, causing the first spring to deform under compression, the mounting tube being fixedly inserted through the surface of the fixed frame, and the sliding rod... The rod is slidably installed on the inner wall of the mounting tube. The connecting frame is fixedly installed on the side of the sliding rod near the lifting arm. The hollow tube is fixedly installed at the bottom of the connecting frame. The support foot slides through the bottom of the hollow tube. The first spring is disposed between the support foot and the connecting frame. The grip is fixedly installed on the circumferential surface of the support foot. The grip slides through the circumferential surface of the hollow tube. The connecting frame has a sliding groove on the side near the lifting arm. The sliding groove contacts the bottom of the lifting arm. The support foot provides support for the lifting arm through the connecting frame, so that the connecting frame can apply an upward supporting force to the bottom of the lifting arm during the welding process.

[0007] According to the above technical solution, the top of the mounting tube slides through a limiting rod, a second spring is provided between the limiting rod and the mounting tube, and several circular grooves are opened on the circumferential surface of the sliding rod. The bottom of the limiting rod contacts the inner wall of the circular groove, and the contact surface between the limiting rod and the circular groove separates, so that the limiting rod releases the limiting force applied to the sliding rod.

[0008] According to the above technical solution, a support frame is fixedly installed on the side of the fixed frame near the sliding rod. A circular hole is opened on the support frame. The circumferential surface of the sliding rod contacts the inner wall of the circular hole. When the sliding rod moves, the fixed frame provides support for the sliding rod, ensuring that the sliding rod moves more smoothly.

[0009] According to the above technical solution, the hollow tube is equipped with a locking device for locking the grip, and the locking device is equipped with a protective device to improve safety; the locking device includes a hollow plate, a lifting frame, a portal frame, a sliding block, a telescopic block, a first spring piece, a rotating rod, a stop block, and a circular block. The telescopic block compresses the first spring piece during movement, causing the first spring piece to deform under pressure. The hollow plate is fixedly installed on the circumferential surface of the hollow tube, the lifting frame slides through the inner and outer walls of the hollow plate, the portal frame is fixedly installed on the side of the hollow plate away from the hollow tube, and the sliding block slides on the inner wall of the portal frame. The telescopic block slides through the side of the sliding block near the hollow plate. The first spring is disposed between the telescopic block and the sliding block. The rotating rod is rotatably mounted on the side of the sliding block away from the hollow plate. The abutment is fixedly mounted on the circumferential surface of the rotating rod. The circular block is fixedly mounted on the surface of the lifting frame. A rectangular groove is formed on the side of the hollow plate near the telescopic block. The telescopic block contacts the inner wall of the rectangular groove. The annular inner wall of the lifting frame contacts the circumferential surface of the handle. The movement of the handle causes the lifting frame to move upward. The movement of the lifting frame causes the circular block to move upward. A slot is formed on the side of the lifting frame near the telescopic block.

[0010] According to the above technical solution, the side of the telescopic block away from the sliding block is provided with an arc surface, and the top of the lifting frame is provided with an inclined surface. The inclined surface of the lifting frame contacts the arc surface of the telescopic block during movement, so that the lifting frame moves and squeezes the arc surface of the telescopic block.

[0011] According to the above technical solution, a first spiral spring is provided between the rotating rod and the sliding block. The rotating rod stretches the first spiral spring during rotation, and the first spiral spring deforms due to stretching. The abutment is fan-shaped, and the fan surface of the abutment contacts the inner wall of the door frame. The side of the abutment away from the sliding block contacts the inner wall of the door frame.

[0012] According to the above technical solution, the protective device includes a C-shaped frame, a rubber plate, a second spring sheet, a connecting frame, a rotating shaft, an arc-shaped piece, and a rectangular block. The rubber plate moves and compresses the second spring sheet, causing the second spring sheet to deform under pressure. The C-shaped frame is fixedly installed on the side of the hollow plate near the circular block. The rubber plate slides through the side of the C-shaped frame near the circular block. The second spring sheet is disposed between the rubber plate and the C-shaped frame. The connecting frame is fixedly installed on the surface of the C-shaped frame. The rotating shaft is rotatably installed on the inner wall of the connecting frame. The arc-shaped piece is fixedly installed on the circumferential surface of the rotating shaft. The rectangular block is fixedly installed on the side of the connecting frame near the circular block. A corrugated groove is provided on the side of the rubber plate away from the second spring sheet. The corrugated groove contacts the circumferential surface of the circular block. When the circular block moves upward, the contact surface between the circular block and the corrugated groove of the rubber plate separates, causing the deformed second spring sheet to begin to recover. An inclined surface is provided on the side of the rubber plate near the arc-shaped piece.

[0013] According to the above technical solution, a second spiral spring is provided between the rotating shaft and the connecting frame. During the rotation of the rotating shaft, the second spiral spring is stretched and deformed. The rectangular block and the side of the arc-shaped piece close to the rubber plate are in contact.

[0014] This invention provides a welding auxiliary device for the boom of a tower crane, which has the following advantages: (1) The tower crane boom welding auxiliary device moves the support foot upward by moving the lever. The support foot separates from the ground during the movement. By raising the position of the support foot, the adjustment process can be made smoother and the friction between the support foot and the ground during the movement can be effectively prevented, thereby extending the service life of the support foot. At the same time, the support foot provides support for the boom. By quickly adjusting the position of the connecting frame, the position of the connecting frame providing support for the boom can be flexibly changed, thereby enhancing the stability of the boom itself during the welding process.

[0015] (2) The tower crane boom welding auxiliary device has a telescopic block that contacts the slot to limit the lifting frame. The telescopic block automatically limits the lifting frame, which effectively simplifies the operation process, reduces the workload of the operator, and improves the overall work efficiency. At the same time, the contact surface between the abutment block and the gate frame is separated during the rotation. By setting the abutment block to contact the gate frame, it can effectively prevent the telescopic block from separating from the slot due to improper operation, thereby improving the safety of the welding process.

[0016] (3) The welding auxiliary device for the boom of the tower crane, the arc plate vibrates when it collides with the rectangular block during the reset process. The vibration generated by the collision between the arc plate and the rectangular block can not only effectively prevent the lifting frame from getting stuck during movement, but also ensure that the telescopic block can smoothly contact the slot. At the same time, the speed of the circular block moving downward is slowed down by the reaction force. By applying additional resistance when the circular block moves downward, the impact force generated when the support foot resets downward and contacts the ground can be effectively reduced, thereby effectively improving the stability of the welding process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fixing frame structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the support device of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram showing the position and structure of the locking device and the protective device of the present invention; Figure 6This is a schematic diagram of the internal structure of the locking device of the present invention; Figure 7 This is a schematic diagram of the position and structure of the first spring piece of the present invention; Figure 8 This is a schematic diagram of the internal structure of the protective device of the present invention.

[0018] In the diagram: 1. Movable base; 2. Mounting plate; 3. Fixing frame; 4. Lifting arm; 5. Mounting tube; 6. Sliding rod; 7. Connecting frame; 8. Hollow tube; 9. Support leg; 10. Spring No. 1; 11. Handle; 12. Limiting rod; 13. Spring No. 2; 141. Hollow plate; 142. Lifting frame; 143. Gate frame; 144. Sliding block; 145. Telescopic block; 146. Spring No. 1; 147. Rotating rod; 148. Abutment block; 149. Round block; 151. C-shaped frame; 152. Rubber plate; 153. Spring No. 2; 154. Connecting frame; 155. Rotating shaft; 156. Arc-shaped piece; 157. Rectangular block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-4 One embodiment of the present invention is: a welding auxiliary device for a tower crane boom, comprising a movable base 1, an mounting plate 2 fixedly mounted on the surface of the movable base 1, a fixing frame 3 fixedly mounted on the side of the mounting plate 2 away from the movable base 1, a boom 4 fixedly mounted on the top of the fixing frame 3, and a support device; wherein the support device comprises a mounting tube 5, a sliding rod 6, a connecting frame 7, a hollow tube 8, a support foot 9, a first spring 10, and a gripping rod 11, the mounting tube 5 being fixedly inserted through the surface of the fixing frame 3, the sliding rod 6 being slidably mounted on the inner wall of the mounting tube 5, and the connecting frame 7 being fixedly mounted through the surface of the fixing frame 3. The hollow tube 8 is fixedly installed on the side of the sliding rod 6 near the lifting arm 4. The support foot 9 slides through the bottom of the hollow tube 8. The first spring 10 is set between the support foot 9 and the connecting frame 7. The handle 11 is fixedly installed on the circumferential surface of the support foot 9 and slides through the circumferential surface of the hollow tube 8. The side of the connecting frame 7 near the lifting arm 4 has a sliding groove that contacts the bottom of the lifting arm 4. By raising the position of the support foot 9, the adjustment process can be made smoother, and the friction between the support foot 9 and the ground can be effectively prevented when it moves.

[0021] The top of the mounting tube 5 slides through the limiting rod 12. A second spring 13 is provided between the limiting rod 12 and the mounting tube 5. Several circular grooves are opened on the circumferential surface of the sliding rod 6. The bottom of the limiting rod 12 contacts the inner wall of the circular groove. By quickly adjusting the position of the connecting frame 7, the position of the connecting frame 7 providing support for the lifting arm 4 can be flexibly changed, thereby enhancing the stability of the lifting arm 4 itself during the welding process.

[0022] A support frame is fixedly installed on the side of the fixed frame 3 near the sliding rod 6. The support frame has a circular hole, and the circumferential surface of the sliding rod 6 contacts the inner wall of the circular hole. By setting up the support frame, the stability of the welding process is effectively improved.

[0023] In this embodiment, during operation, the support leg 9 provides support for the lifting arm 4 through the connecting frame 7, enabling the connecting frame 7 to apply an upward supporting force to the bottom of the lifting arm 4 during the welding process, thereby improving the stability of the lifting arm 4 itself. When it is necessary to adjust the position of the connecting frame 7, the limiting rod 12 is manually pulled upward. During the movement, the limiting rod 12 compresses the second spring 13, causing the second spring 13 to deform under compression. At the same time, the surface of the limiting rod 12 that contacts the circular groove separates, thus releasing the limiting effect of the limiting rod 12 on the sliding rod 6. Then, the sliding rod 6 is controlled to move towards the lifting arm. The sliding rod 6 moves in four directions, causing the connecting frame 7 to move away from the fixed frame 3. During this movement, the lifting arm 4 provides necessary support to ensure smooth movement of the connecting frame 7. Simultaneously, the movement of the connecting frame 7 causes the hollow tube 8 to move away from the fixed frame 3, which in turn causes the support leg 9 to move away from the fixed frame 3. When the connecting frame 7 moves below the welding position, the limiting rod 12 is released, causing the deformed second spring 13 to return to its original state and move the limiting rod 12 downwards. During movement, the connecting rod 6 contacts the corresponding groove, restricting further movement. By quickly adjusting the position of the connecting frame 7, the position in which the connecting frame 7 provides support for the lifting arm 4 can be flexibly changed, thereby enhancing the stability of the lifting arm 4 during welding. During the adjustment of the position of the connecting frame 7, another operator can pull the handle 11 upward. The movement of the handle 11 causes the support foot 9 to move upward. The bottom of the support foot 9 separates from the ground during movement. At the same time, the support foot 9 compresses the first spring 10 during movement. The first spring 10 deforms under compression. The deformed first spring 10 applies an upward thrust to the connecting frame 7, ensuring that the connecting frame 7 maintains stable contact with the lifting arm 4 during movement. When the connecting frame 7 moves to the designated position, the handle 11 is controlled to return downward. The movement of the handle 11 causes the support foot 9 to move downward and re-contact the ground. At the same time, the deformed first spring 10 gradually returns to its original shape. By raising the position of the support foot 9, not only can the adjustment process be made smoother, but the friction between the support foot 9 and the ground during movement can also be effectively prevented, thereby extending the service life of the support foot 9.

[0024] Please see Figures 1-8 Based on the above embodiments, in another embodiment of the present invention, a locking device for locking the grip bar 11 is provided on the hollow tube 8, and a protective device for improving safety is provided on the locking device; the locking device includes a hollow plate 141, a lifting frame 142, a gate-shaped frame 143, a sliding block 144, a telescopic block 145, a first spring piece 146, a rotating rod 147, a stop block 148, and a round block 149. The hollow plate 141 is fixedly installed on the circumferential surface of the hollow tube 8, the lifting frame 142 slides through the inner and outer walls of the hollow plate 141, the gate-shaped frame 143 is fixedly installed on the side of the hollow plate 141 away from the hollow tube 8, the sliding block 144 is slidably installed on the inner wall of the gate-shaped frame 143, and the telescopic block 145 slides through the sliding block 144. On the side near the hollow plate 141, a first spring piece 146 is disposed between the telescopic block 145 and the sliding block 144. A rotating rod 147 is rotatably mounted on the side of the sliding block 144 away from the hollow plate 141. A stop block 148 is fixedly mounted on the circumferential surface of the rotating rod 147. A circular block 149 is fixedly mounted on the surface of the lifting frame 142. A rectangular groove is provided on the side of the hollow plate 141 near the telescopic block 145. The telescopic block 145 contacts the inner wall of the rectangular groove. The annular inner wall of the lifting frame 142 contacts the circumferential surface of the handle 11. A slot is provided on the side of the lifting frame 142 near the telescopic block 145. The telescopic block 145 automatically applies a limiting effect to the lifting frame 142, effectively simplifying the operation process and reducing the workload of the operator.

[0025] The side of the telescopic block 145 away from the sliding block 144 has an arc surface, and the top of the lifting frame 142 has an inclined surface. By opening the inclined surface, it is ensured that when the lifting frame 142 contacts the telescopic block 145, it can smoothly squeeze the telescopic block 145 to move.

[0026] A spiral spring is provided between the rotating rod 147 and the sliding block 144. The abutment block 148 is fan-shaped, with the fan surface of the abutment block 148 contacting the inner wall of the door frame 143. The side of the abutment block 148 away from the sliding block 144 is in contact with the inner wall of the door frame 143. By setting the abutment block 148 to contact the door frame 143, the telescopic block 145 can be effectively prevented from disengaging from the slot due to improper operation, thereby improving the safety of the welding process.

[0027] The protective device includes a C-shaped frame 151, a rubber plate 152, a second spring clip 153, a connecting frame 154, a rotating shaft 155, an arc-shaped piece 156, and a rectangular block 157. The C-shaped frame 151 is fixedly installed on the side of the hollow plate 141 near the circular block 149. The rubber plate 152 slides through the side of the C-shaped frame 151 near the circular block 149. The second spring clip 153 is disposed between the rubber plate 152 and the C-shaped frame 151. The connecting frame 154 is fixedly installed on the surface of the C-shaped frame 151. The rotating shaft 155 is rotatably installed on the inner wall of the connecting frame 154. The shaped piece 156 is fixedly installed on the circumferential surface of the rotating shaft 155, and the rectangular block 157 is fixedly installed on the side of the connecting frame 154 near the round block 149. The side of the rubber plate 152 away from the second spring piece 153 has a corrugated groove, which contacts the circumferential surface of the round block 149. The side of the rubber plate 152 near the arc-shaped piece 156 has a slope. The vibration generated by the collision between the arc-shaped piece 156 and the rectangular block 157 can not only effectively prevent the lifting frame 142 from getting stuck during movement, but also ensure that the telescopic block 145 can smoothly contact the groove.

[0028] A second spiral spring is provided between the rotating shaft 155 and the connecting frame 154. The rectangular block 157 and the side of the arc plate 156 that is close to the rubber plate 152 are in contact. By applying additional resistance when the circular block 149 moves downward, the impact force generated when the support foot 9 returns to its original position and contacts the ground can be effectively reduced, thereby effectively improving the stability of the welding process.

[0029] In this embodiment, when the lever 11 moves, it causes the lifting frame 142 to move upward. The movement of the lifting frame 142 causes the circular block 149 to move upward. Simultaneously, the inclined surface of the lifting frame 142 contacts the arc surface of the telescopic block 145 during the movement, causing the lifting frame 142 to press against the arc surface of the telescopic block 145. The telescopic block 145 is pressed and moves towards the sliding block 144. During the movement, the telescopic block 145 presses against the first spring piece 146, causing the first spring piece 146 to deform under pressure. The lifting frame 142 continues to move and contact the telescopic block. When the contact surfaces of 145 separate, the deformed first spring piece 146 returns to its original shape, causing the telescopic block 145 to move away from the sliding block 144. During this movement, the telescopic block 145 contacts the inner wall of the slot, thus limiting the lifting frame 142. The lifting frame 142 is thus prevented from resetting downwards, ensuring that the support leg 9 remains at the set height. By automatically limiting the lifting frame 142 through the telescopic block 145, the operation process is effectively simplified, the workload of the operator is reduced, and overall efficiency is improved. To improve the efficiency of the work, when the limit needs to be released, first control the rotating rod 147 to rotate clockwise. During rotation, the rotating rod 147 stretches the first spiral spring, causing it to deform. Simultaneously, the rotation of the rotating rod 147 drives the stop block 148 to rotate clockwise. During this rotation, the surface of the stop block 148 that contacts the portal frame 143 separates, thus releasing the limit imposed by the portal frame 143 on the rotating rod 147. This pulls the rotating rod 147 away from the hollow plate 141, and the movement of the rotating rod 147 drives the stop block... 148 moves away from the hollow plate 141, while the rotating rod 147 moves, causing the sliding block 144 to move away from the hollow plate 141. The sliding block 144 moves, causing the telescopic block 145 to move away from the hollow plate 141. During the movement, the telescopic block 145 separates from the slot, thereby releasing the limit on the lifting frame 142. By setting the stop block 148 to contact the door frame 143, the telescopic block 145 can be effectively prevented from separating from the slot due to improper operation, thereby improving the safety of the welding process. As the circular block 149 moves upward, the surface of the circular block 149 that contacts the corrugated groove of the rubber plate 152 separates, causing the deformed second spring piece 153 to recover and move the rubber plate 152 closer to the circular block 149. Meanwhile, the circular block 149 continues to move and contacts the curved surface of the arc-shaped piece 156, causing the arc-shaped piece 156 to rotate upward. During this rotation, the surface of the arc-shaped piece 156 that contacts the rectangular block 157 separates. Simultaneously, the rotation of the arc-shaped piece 156 causes the rotating shaft 155 to rotate upward. During this rotation, the rotating shaft 155 stretches the second spiral spring, causing it to deform. The deformed second spiral spring... Energy is stored under its own elasticity. When the contact surface between the circular block 149 and the arc-shaped piece 156 separates, the deformed second spiral spring returns to its original state, causing the rotating shaft 155 to quickly reset. The rotation of the rotating shaft 155 causes the arc-shaped piece 156 to quickly reset as well. During the reset process, the arc-shaped piece 156 collides with the rectangular block 157, generating vibration. The rectangular block 157 transmits the vibration to the moving lifting frame 142, making the movement of the lifting frame 142 smoother. The vibration generated by the collision between the arc-shaped piece 156 and the rectangular block 157 not only effectively prevents the lifting frame 142 from jamming during movement, but also ensures that the telescopic block 145 smoothly engages with the obstruction block. When the circular block 149 returns to its original position, it contacts the concave surface of the arc-shaped piece 156 during its movement. Because the arc-shaped piece 156 is blocked by the rectangular block 157 and cannot rotate downwards, the circular block 149 compresses the arc-shaped piece 156 during its movement. The arc-shaped piece 156 deforms under this pressure, and the deformed arc-shaped piece 156 exerts a reaction force on the moving circular block 149. The downward movement speed of the circular block 149 is slowed by this reaction force. When the contact surfaces of the circular block 149 and the arc-shaped piece 156 separate, the deformed arc-shaped piece 156 quickly returns to its initial state, while the circular block 149 continues to move and contact the rubber plate 1. When the inclined plane 149 of the circular block 149 moves and presses against the inclined plane 149, the rubber plate 152 is pressed and moves away from the circular block 149. The rubber plate 152 presses against the second spring piece 153, which deforms under pressure. The deformed second spring piece 153 exerts a reaction force on the rubber plate 152, so that the corrugated groove of the rubber plate 152 keeps in close contact with the circular block 149, thereby improving the stability of the circular block 149. By applying additional resistance when the circular block 149 moves downward, the impact force generated when the support foot 9 returns to its original position and contacts the ground can be effectively reduced, thereby effectively improving the stability of the welding process.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding auxiliary device for the boom of a tower crane, comprising a movable base (1), characterized in that: The surface of the mobile base (1) is fixedly mounted with an installation plate (2), and a fixed frame (3) is fixedly mounted on the side of the installation plate (2) away from the mobile base (1). A lifting arm (4) is fixedly mounted on the top of the fixed frame (3), and a support device is also included. The support device includes a mounting tube (5), a sliding rod (6), a connecting frame (7), a hollow tube (8), a support foot (9), a first spring (10), and a gripping rod (11). The mounting tube (5) is fixedly inserted through the surface of the fixed frame (3). The sliding rod (6) is slidably installed on the inner wall of the mounting tube (5). The connecting frame (7) is fixedly installed on the side of the sliding rod (6) near the lifting arm (4). The hollow tube (8) is fixedly installed at the bottom of the connecting frame (7). The support foot (9) is slidably inserted through the bottom of the hollow tube (8). The first spring (10) is located between the support foot (9) and the connecting frame (7). The gripping rod (11) is fixedly installed on the circumferential surface of the support foot (9). The gripping rod (11) is slidably inserted through the circumferential surface of the hollow tube (8). The connecting frame (7) has a sliding groove on the side near the lifting arm (4). The sliding groove is in contact with the bottom of the lifting arm (4). The hollow tube (8) is provided with a locking device for locking the grip (11), and the locking device is provided with a protective device to improve safety. The locking device includes a hollow plate (141), a lifting frame (142), a portal frame (143), a sliding block (144), a telescopic block (145), a first spring (146), a rotating rod (147), a stop block (148), and a round block (149). The hollow plate (141) is fixedly installed on the circumferential surface of the hollow tube (8). The lifting frame (142) slides through the inner and outer walls of the hollow plate (141). The portal frame (143) is fixedly installed on the side of the hollow plate (141) away from the hollow tube (8). The sliding block (144) slides through the inner wall of the portal frame (143). The telescopic block (145) slides through the sliding block (144) near the hollow plate (141). On one side of the hollow plate (141), the first spring piece (146) is disposed between the telescopic block (145) and the sliding block (144). The rotating rod (147) is rotatably mounted on the side of the sliding block (144) away from the hollow plate (141). The abutment block (148) is fixedly mounted on the circumferential surface of the rotating rod (147). The circular block (149) is fixedly mounted on the surface of the lifting frame (142). A rectangular groove is provided on the side of the hollow plate (141) near the telescopic block (145). The telescopic block (145) contacts the inner wall of the rectangular groove. The annular inner wall of the lifting frame (142) contacts the circumferential surface of the handle (11). A slot is provided on the side of the lifting frame (142) near the telescopic block (145).

2. The tower crane boom welding auxiliary device according to claim 1, characterized in that: The top of the mounting tube (5) slides through a limiting rod (12), and a second spring (13) is provided between the limiting rod (12) and the mounting tube (5). Several circular grooves are opened on the circumferential surface of the sliding rod (6), and the bottom of the limiting rod (12) contacts the inner wall of the circular groove.

3. The tower crane boom welding auxiliary device according to claim 2, characterized in that: The fixed frame (3) has a support frame fixedly installed on the side near the sliding rod (6). The support frame has a circular hole, and the circumferential surface of the sliding rod (6) is in contact with the inner wall of the circular hole.

4. The tower crane boom welding auxiliary device according to claim 3, characterized in that: The telescopic block (145) has an arc surface on the side away from the sliding block (144), and the top of the lifting frame (142) has an inclined surface.

5. The tower crane boom welding auxiliary device according to claim 4, characterized in that: A spiral spring is provided between the rotating rod (147) and the sliding block (144). The abutment (148) is fan-shaped. The fan surface of the abutment (148) contacts the inner wall of the door frame (143). The side of the abutment (148) away from the sliding block (144) contacts the inner wall of the door frame (143).

6. The tower crane boom welding auxiliary device according to claim 5, characterized in that: The protective device includes a C-shaped frame (151), a rubber plate (152), a second spring clip (153), a connecting frame (154), a rotating shaft (155), an arc-shaped piece (156), and a rectangular block (157). The C-shaped frame (151) is fixedly installed on the side of the hollow plate (141) near the circular block (149). The rubber plate (152) slides through the side of the C-shaped frame (151) near the circular block (149). The second spring clip (153) is disposed between the rubber plate (152) and the C-shaped frame (151). The connecting frame (154) The rotating shaft (155) is rotatably mounted on the inner wall of the connecting frame (154), the arc-shaped piece (156) is fixedly mounted on the circumferential surface of the rotating shaft (155), the rectangular block (157) is fixedly mounted on the side of the connecting frame (154) near the round block (149), the rubber plate (152) has a corrugated groove on the side away from the second spring piece (153), the corrugated groove is in contact with the circumferential surface of the round block (149), and the rubber plate (152) has a bevel on the side near the arc-shaped piece (156).

7. The tower crane boom welding auxiliary device according to claim 6, characterized in that: A second spiral spring is provided between the rotating shaft (155) and the connecting frame (154), and the rectangular block (157) and the side of the arc-shaped piece (156) close to the rubber plate (152) are in contact.

Images