Double-trolley bridge crane

Abstract

The utility model discloses a double-trolley bridge crane, which belongs to the technical field of cranes and comprises two longitudinal beams arranged in parallel and a movable chassis arranged on the longitudinal beams and capable of moving back and forth, two movable trolleys capable of moving left and right are arranged on the movable chassis, and a lifting device and a lifting hook are arranged on each movable trolley. Limiting plates are arranged on the left side and the right side of the movable chassis correspondingly. When the anti-collision device is used, the movable trolley moves leftwards and rightwards to the limiting plates on the left side and the right side, so that the movable trolley collides with the limiting plates, and when the movable trolley moves leftwards and rightwards to the outer side to collide with the limiting plates, the movable trolley collides with the limiting plates through the anti-collision device; the anti-collision device can counteract most impact force of collision, so that the mobile trolley is prevented from being directly and rigidly impacted; damage caused by rigid impact on the moving trolley is reduced, and the service life of the moving trolley is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cranes, especially a kind of double-trolley bridge crane. BACKGROUND

[0002] Crane refers to the vertical lifting and horizontal transport of heavy objects in a certain range Multi-action hoisting machinery. Also known as overhead crane, hang, crane. Transport heavy objects to move horizontally is completed by trolley set on crane, trolley can move left and right, and trolley is provided with winch and lifting hook, realizes the hoisting of heavy objects.

[0003] Part of crane is provided with two trolleys, two trolleys can realize synchronous lifting, synchronous transverse movement, synchronous front and back movement, and transport the same target together, can also run independently, work respectively, when trolley moves left and right, limit plate is arranged at the limit position of left side and the limit position of right side, when trolley moves to limit plate, moving trolley is blocked by limit plate to stop moving continuously, prevent trolley from moving out of limit, in normal use, trolley often collides with limit plate when moving left and right, long time, easy to cause damage of trolley. UTILITARY MODEL CONTENT

[0004] The utility model aims at providing a kind of double-trolley bridge crane, with the advantage that rigid impact suffered by trolley is reduced when trolley collides with limit plate, effectively solve the problem of reducing service life of trolley because of trolley collides with limit plate in prior art.

[0005] The utility model adopts the following technical scheme: a kind of double-trolley bridge crane, including one parallelly arranged longitudinal beam and the mobile chassis that can move back and forth being arranged on longitudinal beam, mobile chassis is provided with two movable trolleys that can move left and right, each movable trolley is provided with lifting device and lifting hook, lifting device is used to lift lifting hook, the left and right sides of mobile chassis are provided with limit plate, the outside of each movable trolley is provided with anti-collision device, anti-collision device is used to prevent movable trolley and limit plate from directly contacting and producing rigid impact when movable trolley moves to the limit plate of outside.

[0006] Further, the anti-collision device includes a cylinder body fixedly arranged outside the movable trolley, a collision rod is slidably arranged in the cylinder body along the left-right direction, an anti-collision block is fixedly arranged at the outer end of the collision rod, and a spring is sleeved on the collision rod between the anti-collision block and the cylinder body.

[0007] Further, the cylinder body is provided with a damping device connected with the inner end of the collision rod.

[0008] Further, the damping device comprises a piston slidingly arranged in the cylinder along the left-right direction, the outer side of the piston is fixedly arranged with the anti-collision rod, and the piston divides the internal space of the cylinder into a left space and a right space; the cylinder is filled with hydraulic oil, the outer surface of the cylinder is provided with a communication pipe, one end of the communication pipe is communicated with the left space of the cylinder, the other end of the communication pipe is communicated with the right space of the cylinder, and a damping hole is arranged in the communication pipe.

[0009] Further, the communication pipe comprises two hydraulic oil pipe joints respectively communicated with the left space and the right space of the cylinder, the top end of each hydraulic oil pipe joint is fixedly arranged with an elbow, a damping pipe assembly is fixedly arranged between the two elbows, and the damping hole is arranged in the communication pipe assembly.

[0010] Further, the damping pipe assembly comprises a connecting pipe, the inside of the connecting pipe is provided with a damping block, and the damping hole is arranged in the damping block.

[0011] Further, a valve cavity is coaxially arranged in the inside of the connecting pipe, the right side wall of the valve cavity forms a valve seat, the right side of the damping block can seal the valve seat, the left side of the damping block is fixedly arranged with a valve rod, the valve rod is slidingly arranged in a fixed ring along the left-right direction, the fixed ring is fixedly arranged with the inner side wall of the connecting pipe through a connecting rod; a valve spring is sleeved on the valve rod between the damping block and the fixed ring, the valve spring always drives the damping hole to move rightward to seal the valve seat; a plurality of windows communicated with the left end of the damping hole are arranged at the position where the valve rod contacts the damping hole.

[0012] Further, the cylinder is provided with a first cavity and a second cavity, the first cavity is communicated with the left hydraulic pipe joint, and the second cavity is communicated with the right hydraulic pipe joint; the left side of the piston is coaxially fixedly arranged with a plunger, the piston is slidingly arranged in the second cavity along the left-right direction, and the plunger is slidingly arranged in the first cavity along the left-right direction; when the piston moves leftward and rightward, the volume change of the first cavity and the volume change of the part of the second cavity located on the right side of the piston are equal.

[0013] Further, the outer surface of the cylinder is provided with a vent hole communicated with the second cavity, and the vent hole is located on the left side of the second cavity.

[0014] Further, the moving chassis comprises two cross beams arranged between the two longitudinal beams along the left-right direction, and the two cross beams are fixedly arranged through two limiting plates; two moving trolleys are slidingly arranged between the two cross beams along the left-right direction; and the moving chassis further comprises a driving device, which is used to drive the cross beams to move forward and backward along the longitudinal beams.

[0015] The utility model discloses a movable trolley and anti -collision device, in the use of the device, when movable trolley moves left and right, will appear the situation of moving to the limiting plate at both sides, causes movable trolley and limiting plate to produce the impact, through the setting anti -collision device makes movable trolley left and right move to the outside and limiting plate impact, through anti -collision device and limiting plate impact, and anti -collision device can offset most of the impact of the impact, and then avoided the direct rigid impact of movable trolley, reduced the damage of movable trolley and received rigid impact, improved the service life of movable trolley.

[0016] The utility model discloses a movable trolley and anti -collision device, in the use of the device, when movable trolley moves left and right, will appear the situation of moving to the limiting plate at both sides, causes movable trolley and limiting plate to produce the impact, through the setting anti -collision device makes movable trolley left and right move to the outside and limiting plate impact, through anti -collision device and limiting plate impact, and anti -collision device can offset most of the impact of the impact, and then avoided the direct rigid impact of movable trolley, reduced the damage of movable trolley and received rigid impact, improved the service life of movable trolley. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole three -dimensional structure schematic diagram of the utility model;

[0018] Figure 2 It is the front view structure schematic diagram of the utility model;

[0019] Figure 3 It is the three -dimensional structure schematic diagram of movable chassis in the utility model;

[0020] Figure 4 It is the three -dimensional structure schematic diagram of crossbeam in the utility model;

[0021] Figure 5 It is the three -dimensional structure schematic diagram of winding drum in the utility model;

[0022] Figure 6 It is the three -dimensional structure schematic diagram of cylinder in the utility model;

[0023] Figure 7 It is the front view structure schematic diagram of cylinder in the utility model;

[0024] Figure 8 It is the internal structure schematic diagram of cylinder in the utility model;

[0025] Figure 9 It is the internal three -dimensional structure schematic diagram of connecting pipe in the utility model;

[0026] Figure 10 It is a valve spring three-dimensional structure schematic view in the utility model;

[0027] Figure 11 It is a damping block and valve rod three-dimensional structure schematic view in the utility model.

[0028] In the figure, 1, longitudinal beam;2, mobile chassis;3, mobile trolley;4, lifting hook;5, limiting plate;6, anti-collision device;7, cylinder body;8, anti-collision rod;9, anti-collision block;10, spring;11, piston;12, communication pipe;13, damping hole;14, hydraulic oil pipe joint;15, elbow;16, connecting pipe;17, damping block;18, valve cavity;19, valve rod;20, fixed ring;21, connecting rod;22, valve spring;23, window;24, first chamber;25, second chamber;26, plunger;27, air hole;28, crossbeam;29, moving block;30, support rod;31, roller;32, first guide rail;33, servo motor;34, vertical rod;35, mobile cover;36, mobile wheel;37, second guide rail;38, transverse moving motor;39, winding drum;40, lifting motor;41, speed reducer gear box;42, end plate;43, steel wire rope;44, movable pulley. DETAILED DESCRIPTION

[0029] Please refer to Figures 1-11 , the following will be described in detail with the utility model in combination with the drawings and examples:

[0030] The double-trolley bridge crane, comprising two parallel longitudinal beams 1 and a mobile chassis 2 movably arranged on the longitudinal beams 1, two mobile trolleys 3 movably arranged on the mobile chassis 2, a lifting device and a lifting hook 4 arranged on each mobile trolley 3, the lifting device being used for lifting the lifting hook 4, a limiting plate 5 arranged on the left and right sides of the mobile chassis 2, and an anti-collision device 6 arranged on the outer side of each mobile trolley 3, the anti-collision device 6 being used for preventing the mobile trolley 3 from directly contacting the limiting plate 5 and producing rigid impact when the mobile trolley 3 moves to the limiting plate 5 on the outer side.

[0031] When in use, the two longitudinal beams 1 are fixedly arranged on the upper side of the two sides of the workshop along the length direction of the workshop, the moving chassis 2 moves forward and backward, moves to the upper side of the material to be hoisted, the lifting device lowers the hook 4 to hook the material, then the lifting device lifts the hook 4, then the moving chassis 2 moves forward and backward, hoists the material to the set position and lowers the material, and the hoisting of the material is completed; in normal use, when the moving trolley 3 moves left and right, the moving trolley 3 may move to the position of the limiting plate 5 on the left and right sides, so that the moving trolley 3 collides with the limiting plate 5, and after long use, the moving trolley 3 may be damaged. In order to solve this problem, the anti-collision device 6 is arranged, so that when the moving trolley 3 moves left and right to the outside and collides with the limiting plate 5, the anti-collision device 6 collides with the limiting plate 5, the anti-collision device 6 can offset most of the impact force of the collision, and the direct and rigid impact on the moving trolley 3 is avoided.

[0032] In the embodiment, the anti-collision device 6 comprises a cylinder body 7 fixedly arranged on the outer side of the moving trolley 3, an anti-collision rod 8 slidingly arranged in the cylinder body 7 along the left and right directions, an anti-collision block 9 fixedly arranged on the outer end of the anti-collision rod 8, and a spring 10 sleeved on the anti-collision rod 8 between the anti-collision block 9 and the cylinder body 7; when in use, when the moving trolley 3 moves to the position of the limiting plate 5, the anti-collision block 9 first collides with the limiting plate 5, the anti-collision block 9 is impacted to move the anti-collision rod 8 inward and compress the spring 10, so that the spring 10 buffers the rigid impact generated by the collision between the anti-collision block 9 and the limiting plate 5, and the moving trolley 3 is prevented from being impacted rigidly, thereby avoiding damage to the moving trolley 3.

[0033] In the above scheme, the spring 10 can only buffer and store the impact force generated by the collision between the moving trolley 3 and the limiting plate 5, and cannot eliminate the impact. In order to solve this problem:

[0034] In the embodiment, the cylinder body 7 is provided with a damping device, and the damping device is connected with the inner end of the anti-collision rod 8; when in use, when the moving trolley 3 moves to the position of the limiting plate 5, the anti-collision block 9 first collides with the limiting plate 5, the anti-collision block 9 is impacted to move the anti-collision rod 8 inward and compress the spring 10, so that the spring 10 buffers the rigid impact generated by the collision between the anti-collision block 9 and the limiting plate 5, the anti-collision rod 8 moves inward to act on the damping device, the damping device consumes the kinetic energy generated by the inward movement of the anti-collision rod 8, reduces the vibration generated when the moving trolley 3 collides, and improves the stability.

[0035] In this embodiment, the damping device includes a piston 11 that slides horizontally within the cylinder 7. The outer side of the piston 11 is fixedly mounted to the anti-collision rod 8. The piston 11 divides the internal space of the cylinder 7 into a left space and a right space. When the anti-collision block 9 is impacted, the anti-collision block 9 drives the piston 11 to move left and right within the cylinder 7 via the anti-collision rod 8. The cylinder 7 is filled with hydraulic oil, and a connecting pipe 12 is provided on the outer surface of the cylinder 7. One end of the connecting pipe 12 is connected to the left space of the cylinder 7, and the other end of the connecting pipe 12 is connected to the right space of the cylinder 7. A damping hole 13 is provided inside the connecting pipe 12, and the diameter of the damping hole 13 is 0.5-1.5mm. In use, when the anti-collision block 9 is impacted by the limiting plate 5, the anti-collision block 9 is forced to the left (within a certain range). Figure 8 As the spring 10 is compressed, the anti-collision block 9 pushes the piston 11 to the left via the anti-collision rod 8. The piston 11 squeezes the hydraulic oil in the left space of the cylinder 7 through the connecting pipe 12 to the right space of the cylinder 7. When the hydraulic oil flows through the connecting pipe 12, it needs to pass through the damping hole 13. Since the diameter of the damping hole 13 is very small, with a diameter of 0.5-1.5mm, when the hydraulic oil passes through the damping hole 13, the friction generated when the hydraulic oil flows between the holes of the damping hole 13, as well as the internal friction inside the oil, will form a damping force. This force will convert the vibration energy into heat energy and release it into the atmosphere, thereby achieving the purpose of offsetting the impact kinetic energy received by the anti-collision block 9.

[0036] In this embodiment, the connecting pipe 12 includes two hydraulic oil pipe joints 14 that are respectively connected to the left and right spaces of the cylinder body 7. Each hydraulic oil pipe joint 14 has a fixed elbow 15 at its top end, and a damping pipe assembly is fixedly arranged between the two elbows 15. A damping hole 13 is located within the connecting pipe 12 assembly. In use, when the anti-collision block 9 is impacted by the limiting plate 5, the anti-collision block 9 is forced to the left (within...). Figure 8 As the piston moves (for reference), the compression spring 10 is moved, and the anti-collision block 9 pushes the piston 11 to the left through the anti-collision rod 8. The hydraulic oil pressure in the left space of the cylinder body 7 increases and flows into the right space of the cylinder body 7 through the hydraulic oil pipe joint 14, elbow 15 and damping pipe assembly. When the hydraulic oil flows through the damping pipe assembly, it needs to pass through the damping hole 13. Since the diameter of the damping hole 13 is very small, with a diameter of 0.5-1.5mm, when the hydraulic oil passes through the damping hole 13, the friction generated when the hydraulic oil flows between the holes of the damping hole 13 and the internal friction inside the oil will form a damping force. This force will convert the vibration energy into heat energy and release it into the atmosphere.

[0037] In this embodiment, the damping tube assembly includes a connecting tube 16, and a damping block 17 is disposed inside the connecting tube 16, with a damping hole 13 formed inside the damping block 17.

[0038] In use, when the anti-collision block 9 is impacted to move left, the moving trolley 3 is in contact with the limiting plate 5, the anti-collision block 9 is moved right under the pushing force of the spring 10, the hydraulic oil in the right side of the cylinder 7 flows back to the left side of the cylinder 7 through the connecting pipe 12, similarly, the hydraulic oil is throttled by the damping hole 13, so that the anti-collision block 9 moves right slowly, resulting in slow resetting of the anti-collision block 9, in order to solve this problem:

[0039] With Figure 10 In the embodiment, the valve cavity 18 is coaxially arranged in the connecting pipe 16, the right side wall of the valve cavity 18 forms a valve seat, the right side surface of the damping block 17 can seal the valve seat, the valve rod 19 is fixedly arranged on the left side surface of the damping block 17, the valve rod 19 is slidably arranged in the fixed ring 20, the fixed ring 20 is fixedly arranged on the inner side wall of the connecting pipe 16 through the connecting rod 21; the valve spring 22 is sleeved on the valve rod 19 between the damping block 17 and the fixed ring 20, the valve spring 22 always drives the damping hole 13 to move right to seal the valve seat; a plurality of windows 23 are arranged on the valve rod 19, which are in communication with the left end of the damping hole 13; in use, when the anti-collision block 9 is impacted by the limiting plate 5, the anti-collision block 9 is forced to move left, the hydraulic oil flows from the left side space of the cylinder 7 to the right side space of the cylinder 7 through the connecting pipe 12, the hydraulic oil flows into the damping hole 13 through the windows 23 of the valve rod 19 and then flows into the right side space of the cylinder 7, so as to consume the kinetic energy of the anti-collision block 9 moving left; when the moving trolley 3 is separated from the limiting plate 5, the anti-collision block 9 is no longer in contact with the limiting plate 5, the spring 10 pushes the anti-collision block 9 to move right, at this time, the hydraulic oil in the right side of the cylinder 7 is squeezed to flow into the connecting pipe 16, at this time, the hydraulic oil flows from the right side to the left side of the damping block 17, because the damping hole 13 limits the flow rate of the hydraulic oil, so the hydraulic oil pushes the damping block 17 to move left to overcome the pushing force of the valve spring 22, so that the damping block 17 opens the valve seat, at this time, the hydraulic oil enters the valve cavity 18 and flows into the left side space of the cylinder 7, because the damping block 17 opens the valve seat, so the flow rate of the hydraulic oil is changed, therefore, when the anti-collision block 9 moves right to reset, it will not be damped, so that the anti-collision block 9 can be quickly reset.

[0040] With Figure 8For the sake of ensuring that the volume of the space of the cylinder body 7 on the left and right sides of the piston 11 changes equally, in the embodiment, the cylinder body 7 is provided with a first chamber 24 and a second chamber 25, the first chamber 24 is in communication with the hydraulic oil pipe joint 14 on the left side, and the second chamber 25 is in communication with the hydraulic oil pipe joint 14 on the right side; the left side of the piston 11 is coaxially provided with a plunger 26, the plunger 26 is slidably arranged in the first chamber 24 along the left-right direction, and the piston 11 is slidably arranged in the second chamber 25 along the left-right direction; when the piston 11 moves left and right, the volume change of the first chamber 24 and the volume change of the part of the second chamber 25 on the right side of the piston 11 are equal; in use, when the anti-collision block 9 is impacted and pushes the piston 11 to move left, the piston 11 drives the plunger 26 to move left, so that the volume of the first chamber 24 is compressed, and at the same time, the volume of the part of the second chamber 25 on the right side of the piston 11 is increased, the decreased volume of the first chamber 24 is equal to the increased volume of the second chamber 25; the hydraulic oil in the first chamber 24 enters the second chamber 25 through the communication pipe 12.

[0041] When the piston 11 moves left and right, the space on the left side of the piston 11 in the second chamber 25 also changes from large to small, forming a vacuum or high pressure, in order to solve this problem, the outer surface of the cylinder body 7 is provided with a vent hole 27 in communication with the second chamber 25, and the vent hole 27 is located on the left side of the second chamber 25; when the piston 11 moves left and right to make the space of the second chamber 25 on the left side of the piston 11 become large or small, the air outside will enter or exit the second chamber 25 on the left side of the piston 11 through the vent hole 27, preventing high pressure or vacuum from being generated in the second chamber 25 on the left side of the piston 11, preventing affecting the movement of the piston 11.

[0042] In the embodiment, the moving chassis 2 comprises two cross beams 28 arranged between the two longitudinal beams 1 along the left-right direction, and the two cross beams 28 are fixedly arranged through two limiting plates 5; the two moving trolleys 3 are slidably arranged between the two cross beams 28 along the left-right direction; further comprising a driving device, the driving device is used for driving the cross beam 28 to move forward and backward along the longitudinal beam 1; the driving device comprises two moving blocks 29, the inner side surface of each moving block 29 is fixedly provided with a supporting rod 30, and the bottom end of each supporting rod 30 is fixedly arranged with the corresponding cross beam 28; the lower end surface of each moving block 29 is rotatably connected with a plurality of rollers 31, the upper end surface of each longitudinal beam 1 is fixedly provided with a first guide rail 32 along the front-rear direction, and further comprising a servo motor 33 fixedly arranged with the inner side surface of the moving block 29, and the output shaft of each servo motor 33 is fixedly arranged with the corresponding roller 31; the moving chassis 2 moves forward and backward on the longitudinal beam 1 through the cooperation of the rollers 31 at both ends and the first guide rails 32; in use, the servo motor 33 drives the roller 31 to rotate, so that the moving block 29 drives the two cross beams 28 to move forward and backward through the connecting rod 21, and further drives the two moving trolleys 3 to move forward and backward between the two longitudinal beams 1, achieving the purpose of lifting and transporting materials.

[0043] In this embodiment, the moving trolley 3 comprises longitudinal rods 34 arranged between the two cross beams 28 in the front-rear direction, both ends of the two longitudinal rods 34 are fixedly arranged through the moving covers 35, a plurality of moving wheels 36 are rotationally connected in each moving cover 35, the inner side of each cross beam 28 is fixedly arranged with a second guide rail 37 matched with the moving wheel 36, the moving trolley 3 moves left and right between the two cross beams 28 through the cooperation of the moving wheel 36 and the second guide rail 37, the moving trolley 3 is further fixedly arranged with a transverse moving motor 38, the output shaft of the transverse moving motor 38 is fixedly arranged with the corresponding moving wheel 36, the transverse moving motor 38 drives the corresponding moving wheel 36 to rotate to drive the moving trolley 3 to move left and right between the two cross beams 28; the lifting device comprises a winding drum 39 arranged in the front-rear direction and a lifting motor 40 fixedly arranged on the moving trolley 3, the output shaft of the lifting motor 40 is fixedly arranged with the input shaft of a speed reducer gear box 41, the output shaft of the speed reducer gear box 41 is coaxially fixedly arranged with the winding drum 39, the front end of the winding drum 39 is rotationally connected with the front moving cover 35 through an end plate 42; a steel wire rope 43 is wound on the winding drum 39, the free end of the steel wire rope 43 is fixedly arranged on the moving trolley 3 through a movable pulley 44 on the lifting hook 4, and the steel wire rope 43 is in transmission connection with the movable pulley 44 on the lifting hook 4; during use, the lifting motor 40 drives the winding drum 39 to rotate through the speed reducer gear box 41, the winding drum 39 winds or releases the steel wire rope 43, so that the lifting hook 4 is lifted through the steel wire rope 43, and the movable pulley 44 is driven to rotate by the steel wire rope 43 when the lifting hook 4 is lifted.

[0044] The working principle of the utility model is: the lifting motor 40 drives the winding drum 39 to rotate through the speed reducer gear box 41, the winding drum 39 winds or releases the steel wire rope 43, so that the lifting hook 4 is lifted through the steel wire rope 43, after the lifting hook 4 lifts the material, the roller 31 is driven to rotate through the servo motor 33, the moving block 29 drives the two cross beams 28 to move forward and backward through the connecting rod 21, and then drives the two moving trolleys 3 to move forward and backward between the two longitudinal beams 1, so that the material is lifted and transported, when the transverse moving motor 38 drives the corresponding moving wheel 36 to rotate and then drives the moving trolley 3 to move left and right between the two cross beams 28, the moving trolley 3 collides with the limiting plates 5 on the left and right sides, at this time, the anti-collision block 9 is impacted, the kinetic energy generated by the impact is offset, the moving trolley 3 is prevented from being directly impacted by the rigid impact, and damage is caused.

Claims

1. A twin-trolley bridge crane characterized by: The utility model provides an anti -collision device of movable trolley, including a parallelly arranged longitudinal beam (1) and the movable chassis (2) of setting on longitudinal beam (1) can move forward and backward, movable chassis (2) is provided with two movable trolley (3) that can move left and right on it, every movable trolley (3) is provided with lifting device and lifting hook (4) on it, lifting device is used for lifting lifting hook (4), the left and right sides of movable chassis (2) are provided with the limiting plate (5) of every movable trolley (3) outside is provided with anti -collision device (6), anti -collision device (6) is used for when movable trolley (3) moves to the limiting plate (5) of outside side, prevents movable trolley (3) with limiting plate (5) direct contact and produces rigid impact.

2. Double-trolley bridge crane according to claim 1, characterized in that The anti-collision device (6) includes a cylinder (7) fixedly arranged outside the movable trolley (3), an anti-collision rod (8) slidably arranged in the cylinder (7) along the left-right direction, an anti-collision block (9) fixedly arranged at the outer end of the anti-collision rod (8), and a spring (10) sleeved on the anti-collision rod (8) between the anti-collision block (9) and the cylinder (7).

3. Double-trolley bridge crane according to claim 2, characterized in that The cylinder (7) is provided with a damping device connected with the inner end of the anti-collision rod (8).

4. Double-trolley bridge crane according to claim 3, characterized in that The damping device includes a piston (11) slidably arranged in the cylinder (7) along the left-right direction, the outer side surface of the piston (11) is fixedly arranged with the anti-collision rod (8), and the piston (11) divides the internal space of the cylinder (7) into a left space and a right space; the cylinder (7) is filled with hydraulic oil, the outer surface of the cylinder (7) is provided with a communication pipe (12), one end of the communication pipe (12) is communicated with the left space of the cylinder (7), the other end of the communication pipe (12) is communicated with the right space of the cylinder (7), and a damping hole (13) is arranged in the communication pipe (12).

5. Double-trolley bridge crane according to claim 4, characterized in that The communication pipe (12) includes two hydraulic oil pipe joints (14) respectively communicated with the left space and the right space of the cylinder (7), the top end of each hydraulic oil pipe joint (14) is fixedly provided with an elbow (15), a damping pipe assembly is fixedly arranged between the two elbows (15), and the damping hole (13) is arranged in the communication pipe (12) assembly.

6. Double-trolley bridge crane according to claim 5, characterized in that The damping pipe assembly includes a connecting pipe (16), the inside of the connecting pipe (16) is provided with a damping block (17), and the damping hole (13) is arranged in the damping block (17).

7. Double-trolley bridge crane according to claim 6, characterized in that The inside of the connecting pipe (16) is coaxially provided with a valve cavity (18), the right side wall of the valve cavity (18) forms a valve seat, the right side surface of the damping block (17) can seal the valve seat, the left side surface of the damping block (17) is fixedly provided with a valve rod (19), the valve rod (19) is slidably arranged in a fixed ring (20) along the left-right direction, the fixed ring (20) is fixedly arranged with the inner side wall of the connecting pipe (16) through a connecting rod (21); a valve spring (22) is sleeved on the valve rod (19) between the damping block (17) and the fixed ring (20), the valve spring (22) always drives the damping hole (13) to move right to seal the valve seat; a plurality of windows (23) communicated with the left end of the damping hole (13) are arranged at the position where the valve rod (19) contacts the damping hole (13).

8. Double-trolley bridge crane according to claim 6, characterized in that The cylinder (7) is internally provided with a first chamber (24) and a second chamber (25), the first chamber (24) is communicated with the left hydraulic oil pipe joint (14), the second chamber (25) is communicated with the right hydraulic oil pipe joint (14); the left side surface of the piston (11) is coaxially fixedly provided with a plunger (26), the piston (11) is slidably arranged in the second chamber (25) along the left-right direction, and the plunger (26) is slidably arranged in the first chamber (24) along the left-right direction; when the piston (11) moves left and right, the volume change of the first chamber (24) and the volume change of the part of the second chamber (25) located on the right side of the piston (11) are equal.

9. Double-trolley bridge crane according to claim 8, characterized in that The outer surface of the cylinder (7) is provided with a vent hole (27) communicated with the second chamber (25), and the vent hole (27) is located on the left side of the second chamber (25).

10. Double-trolley bridge crane according to claim 1, characterized in that The moving chassis (2) comprises a cross beam (28) arranged between the two longitudinal beams (1) along the left-right direction, the two cross beams (28) are fixedly arranged through two limiting plates (5); the two moving trolleys (3) are slidably arranged between the two cross beams (28) along the left-right direction; further comprising a driving device, the driving device is used for driving the cross beam (28) to move along the longitudinal beam (1) back and forth.

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