Bridge construction equipment

Abstract

The present invention relates to the technical field of construction equipment, specifically a bridge construction equipment, comprising a tower body, a balancing arm is fixedly installed on the left side of the upper part of the tower body, a control room and a counterweight are fixedly installed on the upper part of the tower body, a counterweight is fixedly installed on the left end of the balancing arm, a balancing rod and a boom are fixedly installed between the upper left end of the balancing arm and the top of the tower body, a boom is fixedly installed on the right side of the upper part of the tower body, a fulcrum wheel is fixedly installed on the left end of the boom, a pull rod is fixedly installed between the upper right end of the boom and the top of the tower body, and a luffing car is movably installed on the lower part of the boom, and a winch is fixedly installed on the left side of the lower part of the boom. The present invention drives the limit shaft to squeeze switch one and switch two by contacting the limit wheel through the sling. When performing illegal oblique lifting operations, the switch one and switch two limit the winch from retracting the sling. At the same time, the sensitivity of the switch one and switch two can be flexibly and conveniently adjusted, and it can quickly and conveniently adapt to the use scenarios of lifting different heights or different weights.

Description

Technical Field

[0001] The present invention relates to the technical field of construction equipment, in particular to bridge construction equipment. Background Art

[0002] During the bridge construction process, tower cranes are an indispensable equipment on the construction site. The tower cranes of existing technology are already equipped with relatively complete safety devices, but the mainstream tower crane equipment still lacks restrictions on extremely dangerous illegal oblique lifting operations. The mainstream safety devices currently used for anti-oblique lifting are not well coordinated with the lifting ropes. The technical solutions are mostly to use the lifting ropes to directly contact the rigid safety devices, which will aggravate the wear of the lifting ropes and the wear of the safety devices themselves to a certain extent, and easily increase new safety hazards. Since the tower crane anti-oblique lifting devices of existing mainstream technology basically directly monitor the inclination angle of the hoisted objects as the basis for anti-oblique judgment and the monitored inclination angle is fixed, when lifting heavier objects, the object's inclination angle range will be required to be smaller. On the contrary, when the hoisted objects are lighter, the object's inclination angle range will be allowed within the safe operating range. If the weight of the object is too large and exceeds the set range, the anti-tilt device will start to work and limit the lifting of the object. The mainstream technical solution often requires the replacement of tilt sensing parts with different sensitivities for different lifting objects and different lifting heights. Frequent replacement of parts for high-altitude tower cranes increases construction costs and adds new hidden dangers for high-altitude operations. It cannot be widely promoted in practical applications due to its low reliability, poor durability and small application range. To this day, accidents caused by illegal tilt lifting at construction sites still occur from time to time.

[0003] Therefore, a bridge construction device is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge construction equipment, which ensures that the winch can be automatically shut down and the lifting can be stopped in the oblique lifting state through the tower crane luffing trolley and the oblique lifting limit mechanism on the hook, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bridge construction device comprising:

[0007] A tower body, a balance arm is fixedly installed on the left side of the upper part of the tower body, and a control room is fixedly installed on the upper part of the tower body;

[0008] A counterweight is fixedly installed on the left end of the balance arm, and a balance rod is fixedly installed between the upper part of the left end of the balance arm and the top of the tower body;

[0009] A boom is fixedly mounted on the right side of the upper part of the tower body, a fulcrum wheel is fixedly mounted on the right end of the boom, a pull rod is fixedly mounted between the upper part of the right end of the boom and the top of the tower body, a luffing car is movably mounted on the lower part of the boom, and a winch is fixedly mounted on the left side of the lower part of the boom;

[0010] Fixed pulley, two fixed rods are fixedly installed at the lower part of the luffing vehicle, and fixed pulleys are movably installed at the lower part of the two fixed rods;

[0011] The hoist and the fulcrum wheel are commonly connected with a sling, and the sling passes through two fixed pulleys. A hanging wheel is movably installed on the sling, and the hanging wheel is suspended between the two fixed pulleys. A hook is movably installed on the hanging wheel.

[0012] Also includes:

[0013] The tilting limit mechanism is installed on the luffing vehicle, and the tilting limit mechanism can automatically shut down the winch and stop lifting when the tower crane tilts to lift heavy objects.

[0014] The cam is secured to the bottom of the two legs and has an L-shaped limit rod at its lower end for locking when the cam is unlocked.

[0015] Preferably, each of the limiting shafts is fixedly mounted with two limiting plates, the limiting plates are located between the limiting wheel and the limiting rod, springs three are sleeved and mounted on both ends of the limiting shaft, the springs three are located between the limiting plates and the limiting rod, and two switches two are installed on each limiting rod facing the limiting plates, the switches two cooperate with the limiting plates, and the switches two are electrically connected to the winch.

[0016] Preferably, the electric slide controls the limit rod to move left and right, and the limit rod moves left and right to control the contact angle between the sling and the limit wheel.

[0017] Preferably, two limit blocks are installed on the left and right sides of the lower hook of the hanging wheel.

[0018] Preferably, a lifting weight limiter is installed on the winch, and the lifting weight limiter is electrically connected to the switch and cooperates with each other.

[0019] Preferably, a switch three is installed on the lower part of the limit block facing the hook, an alarm is installed on the upper part of the limit block, and the switch three is electrically connected to the alarm.

[0020] Preferably, the spring is made of 60Si2Mn.

[0021] Preferably, the limiting rod is a two-section structure, and the horizontal section and the vertical section are connected by a coil spring hinge.

[0022] Preferably, the limiting shaft has a two-layer structure, the outer layer of the limiting shaft is made of wear-resistant copper alloy, and the inner layer of the limiting shaft is made of high-strength steel.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses a lifting rope to squeeze and contact the limiting wheel installed under the fixed pulley during the lifting process. The limiting wheel drives the limiting shaft to squeeze switch 1 and switch 2. When switch 1 and switch 2 for sensing whether the lifting is oblique are triggered, switch 1 and switch 2 limit the winch from retracting the lifting rope. When illegal oblique lifting operations are performed, the winch will not retract the lifting rope. During the entire working process, the lifting rope is completely restricted by the limiting wheel within a safe range of movement. The limiting wheel and the lifting rope are in rolling friction cooperation. The limiting wheel can also guide the lifting rope. The lifting rope does not directly contact the oblique lifting trigger sensing device. Under the premise of ensuring the normal operation of the entire tower crane structure, the illegal operation of oblique lifting is restricted, thereby ensuring operational safety.

[0025] 2. The electric slide can be remotely controlled in the control room to adjust the horizontal displacement of the two limit rods. Without replacing related parts, the contact angle between the limit rod and the sling can be changed, thereby changing the horizontal squeezing force of the sling on the limit wheel, thereby adjusting the trigger sensitivity of switch 1 and switch 2, quickly and conveniently adapting to the use scenarios of lifting different heights or different weights, and improving the practicality and reliability of safety facilities.

[0026] 3. Installing a limit block on the lifting wheel can reduce the tilting angle of the hook and the lifting object during the lifting and fixing process, avoid the occurrence of oblique lifting when the lifting object is fixed on the hook on the ground, and limit the rotation angle of the hook relative to the lifting wheel during the suspension process. The switch installed on the limit block can cause the alarm on the limit block to send out an oblique lifting danger alarm signal when the hook and the lifting wheel rotate significantly, so as to remind ground personnel to evacuate in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the appearance of the present invention;

[0028] Figure 2 For the present invention Figure 1 Enlarged view of part A in the middle;

[0029] Figure 3 For the present invention Figure 2 Enlarged cross-sectional view of part B in the middle;

[0030] Figure 4 For the present invention Figure 2 Enlarged partial cross-sectional view of the middle C part;

[0031] Figure 5 For the present invention Figure 2 Middle FF cross-sectional view;

[0032] Figure 6 For the present invention Figure 5 Enlarged view of the middle D part;

[0033] Figure 7 It is a cross-sectional view of the limiting shaft of the present invention.

[0034] In the figure: 1. Tower body; 2. Balance arm; 3. Counterweight; 4. Balance rod; 5. Control room; 6. Pull rod; 7. Boom; 8. Fulcrum wheel; 9. Lifting rope; 10. Luffing car; 11. Electric slide; 12. Fixed pulley; 13. Fixed rod; 14. Limit rod; 1401. Limit groove; 1402. Spring 1; 1403. Ball head rod; 1404. Spring 2; 1405. Switch 1; 1406. Switch 2; 15. Limit shaft; 1501. Limit plate; 1502. Spring 3; 16. Limit wheel; 17. Hoisting wheel; 1701. Limit block; 1702. Alarm; 1703. Switch 3; 18. Hook; 19. Winch. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figures 1 to 7 The present invention provides a bridge construction equipment, the technical solution is as follows:

[0037] A bridge construction device comprising:

[0038] The tower body 1, a balance arm 2 is fixedly installed on the left side of the upper part of the tower body 1, and a control room 5 is fixedly installed on the upper part of the tower body 1;

[0039] A counterweight 3 is fixedly installed on the left end of the balance arm 2, and a balance rod 4 is fixedly installed between the upper left end of the balance arm 2 and the top of the tower body 1;

[0040] The boom 7 is fixedly mounted on the right side of the upper part of the tower body 1, a fulcrum wheel 8 is fixedly mounted on the right end of the boom 7, a pull rod 6 is fixedly mounted between the upper right end of the boom 7 and the top of the tower body 1, a luffing car 10 is movably mounted on the lower part of the boom 7, and a winch 19 is fixedly mounted on the left side of the lower part of the boom 7;

[0041] The fixed pulley 12 and the lower part of the luffing vehicle 10 are fixedly mounted with two fixed rods 13, and the lower parts of the two fixed rods 13 are movably mounted with fixed pulleys 12;

[0042] The sling 9, the winch 19 and the fulcrum wheel 8 are connected to the sling 9, and the sling 9 passes through the two fixed pulleys 12. The sling wheel 17 is movably installed on the sling 9. The sling wheel 17 is suspended between the two fixed pulleys 12, and the sling wheel 17 is movably installed with a hook 18;

[0043] Also includes:

[0044] The tilting limiting mechanism is installed on the luffing vehicle 10, and the tilting limiting mechanism can automatically close the winch 19 to stop lifting when the tower crane tilts to lift heavy objects.

[0045] The operator in the control room 5 moves the hook 18 to the top of the construction material to be lifted by the luffing car 10, and then controls the winch 19 to loosen the sling 9 and lower the rear hook 18 to the construction material. After the ground operator hangs the construction material on the hook 18, the operator in the control room 5 controls the winch 19 to retract the sling 9. The sling 9 lifts the construction material on the hanging wheel 17 and the hook 18 vertically. After the vertical lifting reaches a certain height, the luffing car 10 can be used to slide in the axial direction of the boom 7 to control the suspended construction material. The material moves axially along the boom 7 to lift the construction materials to the required place. When the hook 18 hooking the construction material is not lifted vertically but tilted, the boom 7 will bear a load far exceeding that during vertical lifting. At the same time, the lifted construction materials will produce greater inertia, and dangerous accidents are likely to occur at this time. The luffing car 10 is equipped with an oblique lifting limit mechanism, which can limit the winch 19 from retracting the sling 9 during oblique lifting, thereby limiting the lifting of the hanging wheel 17 and the construction materials on the hook 18 during oblique lifting, and cutting off the illegal operation of oblique lifting from the equipment mechanism to ensure construction safety.

[0046] As an embodiment of the present invention, refer to Figures 2 to 4The oblique lifting limit mechanism includes two electric slides 11 fixedly installed at the left and right ends of the lower part of the variable-length vehicle 10. An L-shaped limit rod 14 is movably installed at the lower part of the two electric slides 11. A limit shaft 15 is fixedly installed on the other end of the limit rod 14. A limit groove 1401 is provided between the limit shaft 15 and the limit rod 14 in the horizontal direction. A spring 1402 is installed at the end of the limit groove 1401 away from the sling 9. The spring 1402 cooperates with the limit shaft 15 to push the limit shaft 15 toward one end of the sling 9. The limit groove 1401 near the sling 9 A ball head rod 1403 is movably installed at one end, and a spring 2 1404 is installed on the ball head rod 1403. Switch 1 1405 is fixedly installed on the inner wall of multiple limit grooves 1401 near the sling 9. Switch 1 1405 is electrically connected to the winch 19. Switch 1 1405 cooperates with the ball head rod 1403, the limit shaft 15 cooperates with the ball head rod 1403, the ball head rod 1403 cooperates with the spring 2 1404, and the limit shaft 15 is fixedly installed with a limit wheel 16. The two limit wheels 16 cooperate with the sling 9.

[0047] When the construction materials on the lifting wheel 17 and the hook 18 are lifted perpendicular to the axial direction of the boom 7, the sling 9 can simultaneously squeeze the limiting wheels 16 installed on the left and right sides of the luffing vehicle 10, and the limiting wheels 16 drive the limiting shaft 15 to overcome the thrust of spring 1402 and move along the limiting groove 1401 in the direction away from the lifting cable 9. At this time, the limiting shaft 15 is released from the squeezing of the ball head rod 1403, and the spring 2 1404 pushes the ball head rod 1403 in the direction away from the lifting cable 9. The ball head rod 1403 no longer squeezes and contacts the switch 1405. When the switch 1405 is not squeezed and triggered, the winch 19 can freely retract the sling 9 to lift the lifting wheel 17 and the construction materials on the hook 18. When the lifting wheel 17 and the construction materials on the hook 18 are not perpendicular When the boom 7 is lifted axially, the sling 9 cannot squeeze the limiting wheels 16 installed on the left and right sides of the boom trolley 10 at the same time. The limiting shaft 15 corresponding to the limiting wheel 16 that is not squeezed moves along the limiting groove 1401 toward the direction close to the sling 9 under the thrust of the corresponding spring 1402 until the ball head rod 1403 is completely pushed toward the direction close to the sling 9. The ball head rod 1403 squeezes and contacts the switch 1405. When the switch 1405 is squeezed and triggered, the winch 19 cannot freely retract the sling 9, so that the winch 19 cannot lift the construction materials on the lifting wheel 17 and the hook 18. The lifting wheel 17 and the hook 18 need to be readjusted to be directly above the construction materials to be lifted. Only then can the construction materials be lifted vertically.

[0048] As an embodiment of the present invention, refer to Figure 6 and Figure 7Each limiting shaft 15 is fixedly installed with two limiting plates 1501, and the limiting plates 1501 are located between the limiting wheel 16 and the limiting rod 14. Spring three 1502 is installed on both ends of the limiting shaft 15, and the spring three 1502 is located between the limiting plate 1501 and the limiting rod 14. Two switches 1406 are installed on each limiting rod 14 facing the limiting plate 1501. The switch 1406 cooperates with the limiting plate 1501, and the switch 1406 is electrically connected to the winch 19.

[0049] When the construction materials located directly below the boom 7 in the direction of looking down are being hoisted, the limiting piece 1501 is kept in balance by the action of the two springs 1502, and neither of them is in contact with the inner walls of the limiting rod 14. At this time, the winch 19 can freely retract the sling 9 to lift the construction materials on the lifting wheel 17 and the hook 18. When the construction materials being hoisted are not located directly below the boom 7 in the direction of looking down, the sling 9 forms an angle with the limiting wheel 16, and the construction materials on the lifting wheel 17 and the hook 18 are lifted, giving the limiting wheel 16 an angle along the limiting axis 15. The axial component of force pushes the limiting wheel 16 and the limiting shaft 15 toward the side wall of the limiting rod 14. At this time, the limiting piece 1501 fixedly installed on the limiting shaft 15 will contact and activate the switch 2 1406 installed on the side wall of the limiting rod 14. When the switch 2 1406 is contacted and activated, the winch 19 cannot freely retract the sling 9, so that the winch 19 cannot lift the construction materials on the lifting wheel 17 and the hook 18. The lifting wheel 17 and the hook 18 need to be readjusted to be directly above the construction materials to be lifted, and then vertical lifting can be used to lift the construction materials.

[0050] As an embodiment of the present invention, refer to Figure 3 The electric slide 11 controls the limit rod 14 to move left and right, and the limit rod 14 moves left and right to control the contact angle between the sling 9 and the limit wheel 16.

[0051] When the boom 7 lifts construction materials of different heights or weights, the electric slide 11 can be remotely controlled in the control room 5 to adjust the horizontal displacement of the two limit rods 14, change the contact angle between the limit rod 14 and the sling 9, and thus adjust the trigger sensitivity of switch 1 1405 and switch 2 1406. When the two limit rods 14 move toward each other, the limit wheel 16 is subjected to a greater force of squeezing the sling 9 in the horizontal direction on both sides. When the sling 9 is tilted and lifted, switch 1 1405 and switch 2 1406 are more sensitive and easier to be triggered. When the two limit rods 14 move back and forth, the limit wheel 16 is subjected to a smaller force of squeezing the sling 9 in the horizontal direction on both sides. When the sling 9 is tilted and lifted, switch 1 1405 and switch 2 1406 are more sensitive and easier to be triggered. 5 and switch 2 1406 are not easily triggered. By adjusting the horizontal displacement of the two limit rods 14, the sensitivity of switch 1 1405 and switch 2 1406 can be changed as needed according to the use environment and use requirements. For example, when lifting heavier objects, the danger of oblique lifting is greater when the lifting object is heavier, and switch 1 1405 and switch 2 1406 need to be adjusted to be more sensitive to ensure safety. When lifting lighter objects, the degree of inclination allowed within the safety range is greater, and the danger of oblique lifting is smaller when the lifting object is lighter, and switch 1 1405 and switch 2 1406 need to be adjusted to be less sensitive to reduce misjudgment and improve production efficiency, so that the present invention can be applied to a wider range of usage scenarios, thereby improving the practicality and reliability of the present invention.

[0052] As an embodiment of the present invention, refer to Figure 3 Two limit blocks 1701 are respectively installed on the left and right sides of the lower hook 18 of the hanging wheel 17.

[0053] The limit block 1701 on the lifting wheel 17 can limit the rotation angle of the hook 18 relative to the lifting wheel 17, thereby reducing the probability of the ground operator fixing the construction materials to be lifted on the hook 18 at an angle. It can also reduce the amplitude of the hook 18's inertial swing caused by the lifted object when the lifted object and the hook 18 are not fixed properly during the lifting process, thereby improving the safety of the entire lifting operation.

[0054] As an embodiment of the present invention, refer to Figure 1 and Figure 2 A lifting weight limiter is installed on the winch 19, and the lifting weight limiter is electrically connected to the switch 1405 and cooperates with each other.

[0055] The weight limiter installed on the winch 19 is a necessary safety facility for tower cranes as required by laws and regulations. It is used to detect the lifting weight and ensure that the winch 19 is limited from retracting the sling 9 when the lifting exceeds the limit. In the present invention, when the winch 19 lifts the hook 18 with no load, the weight of the lifting wheel 17 and the hook 18 is relatively light, the contact area between the sling 9 and the limiting wheel 16 is small, and the thrust of the sling 9 on the limiting shaft 15 is insufficient. At this time, the switch 1405 is easily triggered by mistake, causing the winch 19 to be unable to lift the no-load hook 18. When the weight limiter detects that the lifting load of the sling 9 is small, the weight limiter can shield the switch 1405 from mistakenly sending the oblique lifting signal when the hook 18 is no-load, thereby ensuring that the winch 19 can normally lift the no-load hook 18.

[0056] As an embodiment of the present invention, refer to Figure 3 and Figure 5 A switch three 1703 is installed on the lower part of the side of the limit block 1701 facing the hook 18, and an alarm 1702 is installed on the upper part of the limit block 1701. The switch three 1703 is electrically connected to the alarm 1702.

[0057] During the lifting process, the hook 18 is relatively displaced from the lifting wheel 17 due to tilting or other reasons. When the hook 18 rotates to the set angle with the center of the lifting wheel 17 as the center, the hook 18 rotates and touches the switch three 1703 installed on the limit block 1701. The switch three 1703 controls the activation of the alarm 1702, and the alarm 1702 sends a signal to the outside that the hook 18 is tilted.

[0058] As an embodiment of the present invention, refer to Figure 3 The material of the spring 1402 is 60Si2Mn.

[0059] Spring 1402 needs to extrude the limit shaft 15 for a long time, and during the working process, the limit shaft 15 will frequently rotate with spring 1402. The rotational friction will generate a large amount of heat. The elastic modulus of springs made of ordinary materials will gradually decrease when they are in a high-friction and high-temperature environment for a long time, resulting in a decrease in stiffness and a decrease in bearing capacity. The wear and shortening of spring 1402 and continuous heating can easily cause spring 1402 to falsely alarm. 60Si2Mn, as the material of spring 1402, has both excellent thermal stability and high stress wear resistance, which can greatly improve the service life of limit spring 1402, thereby improving the safety and reliability of the entire equipment.

[0060] As another embodiment of the present invention, refer to Figure 3 The limiting rod 14 is a two-section structure, and the connection between the horizontal section and the vertical section is a coil spring hinge.

[0061] When the lifting object suddenly shakes to one side due to the displacement of the center of gravity of the lifting object or other accidents during the lifting process, the sling 9 produces a large impact on the limit rod 14, and the limit rod 14 and the movable structure of the electric slide 11 are easily damaged by the impact. The coil spring hinge structure of the horizontal section and the vertical section of the limit rod 14 can automatically fold through the coil spring hinge structure when the limit rod 14 is subjected to a large horizontal impact generated by the sling 9, ensuring that the limit rod 14 and the movable structure of the electric slide 11 are not damaged by the impact. It is worth noting that the elastic coefficient of the coil spring is greater than the spring coefficient of spring 1 1402, spring 2 1404 and spring 3 1502.

[0062] As an embodiment of the present invention, refer to Figure 3 The limiting shaft 15 is a two-layer structure, the outer layer of the limiting shaft 15 is made of wear-resistant copper alloy, and the inner layer of the limiting shaft 15 is made of high-strength steel.

[0063] The limit shaft 15 is a rotating structure and is in a state of being squeezed by spring 1402 for a long time. At the same time, it needs to maintain a high strength. Therefore, the limit shaft 15 has a two-layer structure. The outer layer of wear-resistant copper alloy can effectively reduce the wear of the limit shaft 15 caused by the long-term squeezing and rotation of spring 1402. Compared with the outer layer of copper alloy material, the inner layer of high-strength steel provides higher strength, ensuring that the limit shaft 15 is not easy to deform during long-term use and has sufficient strength to avoid damage and breakage.

[0064] Working principle: The sling 9 squeezes and contacts the limit wheel 16 installed under the fixed pulley 12 during the lifting process, and the limit wheel 16 drives the limit shaft 15 to squeeze switch 1 1405 and switch 2 1406. When switch 1 1405 and switch 2 1406 for sensing whether oblique lifting is performed are triggered, switch 1 1405 and switch 2 1406 limit the winch 19 from retracting the sling 9. When an illegal oblique lifting operation is performed, the winch 19 will not retract the sling 9, thereby limiting the illegal operation of oblique lifting in terms of mechanism. The horizontal displacement of the two limit rods 14 can be adjusted by the electric slide 11, and the contact angle between the limit rod 14 and the sling 9 can be changed, thereby adjusting the trigger sensitivity of switch 1 1405 and switch 2 1406, so that the present invention can be applied to a wider range of usage scenarios, thereby improving the practicality and reliability of the present invention.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bridge construction device comprising: A tower body (1), a balance arm (2) is fixedly installed on the left side of the upper portion of the tower body (1), and a control room (5) is fixedly installed on the upper portion of the tower body (1); A counterweight (3), the left end of the balancing arm (2) is fixedly mounted with the counterweight (3), and a balancing rod (4) is fixedly mounted between the upper portion of the left end of the balancing arm (2) and the top of the tower body (1); A boom (7), the right side of the upper part of the tower body (1) is fixedly mounted with the boom (7), the right end of the boom (7) is fixedly mounted with a fulcrum wheel (8), a pull rod (6) is fixedly mounted between the upper right end of the boom (7) and the top of the tower body (1), a luffing vehicle (10) is movably mounted on the lower part of the boom (7), and a winch (19) is fixedly mounted on the left side of the lower part of the boom (7); A fixed pulley (12), two fixed rods (13) are fixedly mounted on the lower portion of the luffing vehicle (10), and a fixed pulley (12) is movably mounted on the lower portion of the two fixed rods (13); A sling (9), the hoist (19) and the fulcrum wheel (8) are connected to the sling (9), and the sling (9) passes through two fixed pulleys (12). A hanging wheel (17) is movably installed on the sling (9), and the hanging wheel (17) is suspended between the two fixed pulleys (12). A hook (18) is movably installed on the hanging wheel (17); It is characterized by further comprising: The tilting limit mechanism is installed on the luffing vehicle (10), and the tilting limit mechanism can automatically shut down the hoist (19) to stop lifting when the tower crane tilts to lift heavy objects; The oblique lifting limit mechanism comprises two electric slides (11) fixedly mounted on the left and right ends of the lower part of the variable-length vehicle (10), an L-shaped limit rod (14) is movably mounted on the lower part of the two electric slides (11), a limit shaft (15) is fixedly mounted on the other end of the limit rod (14), a limit slot (1401) is provided between the limit shaft (15) and the limit rod (14) in the horizontal direction, a spring (1402) is mounted at one end of the limit slot (1401) away from the sling (9), the spring (1402) cooperates with the limit shaft (15) to push the limit shaft (15) toward one end of the sling (9), and the limit slot (1401) is close to the sling (9). A ball head rod (1403) is movably installed at one end, and a spring 2 (1404) is installed on the ball head rod (1403). A plurality of limit grooves (1401) are fixedly installed with a switch 1 (1405) on the inner wall near the sling (9). The switch 1 (1405) is electrically connected to the winch (19). The switch 1 (1405) and the ball head rod (1403) cooperate with each other. The limit shaft (15) and the ball head rod (1403) cooperate with each other. The ball head rod (1403) and the spring 2 (1404) cooperate with each other. The limit shaft (15) is fixedly installed with a limit wheel (16). The two limit wheels (16) cooperate with the sling (9).

2. A bridge construction equipment according to claim 1, characterized in that: Two limiting plates (1501) are fixedly installed on each limiting shaft (15), and the limiting plates (1501) are located between the limiting wheel (16) and the limiting rod (14). Spring three (1502) is installed on both ends of the limiting shaft (15), and the spring three (1502) is located between the limiting plate (1501) and the limiting rod (14). Two switches (1406) are installed on each limiting rod (14) in the direction facing the limiting plate (1501). The switch (1406) cooperates with the limiting plate (1501), and the switch (1406) is electrically connected to the winch (19).

3. The bridge construction equipment according to claim 1, characterized in that: The electric slide (11) controls the limit rod (14) to move left and right, and the limit rod (14) moves left and right to control the contact angle between the sling (9) and the limit wheel (16).

4. The bridge construction equipment according to claim 1, characterized in that: Two limit blocks (1701) are respectively installed on the left and right sides of the lower hook (18) of the hanging wheel (17).

5. The bridge construction equipment according to claim 1, characterized in that: The hoist (19) is provided with a lifting weight limiter, which is electrically connected to the switch 1 (1405) and cooperates with each other.

6. The bridge construction equipment according to claim 4, characterized in that: A switch three (1703) is installed on the lower part of the side of the limit block (1701) facing the hook (18), and an alarm (1702) is installed on the upper part of the limit block (1701). The switch three (1703) is electrically connected to the alarm (1702).

7. The bridge construction equipment according to claim 6, characterized in that: The material of the spring 1 (1402) is 60Si2Mn.

8. The bridge construction equipment according to claim 1, characterized in that: The limiting rod (14) is a two-section structure, and the connection mode of the horizontal section and the vertical section is a coil spring hinge.

9. The bridge construction equipment according to claim 1, characterized in that: The limiting shaft (15) has a two-layer structure, the outer layer of the limiting shaft (15) is made of a wear-resistant copper alloy, and the inner layer of the limiting shaft (15) is made of high-strength steel.

Images