Double-beam lifting device

Abstract

The utility model discloses a double-beam lifting device, which belongs to the technical field of lifting devices and comprises longitudinal beams fixedly arranged on the upper portions of two sides of a workshop, a first vehicle rail is fixedly arranged on the upper end face of each longitudinal beam, and two ends of a vehicle frame are slidably connected with the corresponding first vehicle rails through first rollers. Second vehicle rails are fixedly arranged on the upper end face of the vehicle frame in the left-right direction, and the two ends of the hoisting trolley are slidably connected with the corresponding second vehicle rails through second rolling wheels. A winch drum and a power motor are arranged on the hoisting trolley, an output shaft of the power motor and the winch drum are fixedly arranged, and a steel wire rope is wound on the winch drum; the steel wire rope is provided with hooks. By arranging the frame and the hoisting trolleys, when the device is used, the hoisting trolleys can be selected nearby according to materials to be hoisted on site, so that the left-right moving time of the hoisting trolleys is effectively shortened, the hoisting efficiency is improved, and meanwhile, the two hoisting trolleys can be independently and simultaneously used and do not interfere with each other; and the production efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hoisting device, especially a double-beam hoisting device. BACKGROUND

[0002] A crane refers to a multi-motion hoisting machine for vertically lifting and horizontally transporting heavy objects within a certain range. It is also known as a overhead crane or a cargo crane. A bridge crane is a hoisting device that is horizontally placed above a workshop, warehouse, or material yard to transport materials. It is supported by tall concrete columns or metal supports at both ends, leaving a wide space below for hoisting. The bridge of the crane runs longitudinally along the tracks on both sides, allowing for efficient use of the space below for hoisting without obstruction from ground equipment.

[0003] In a wide space, the hoisting device has only one trolley, which moves a long distance in the width direction when hoisting materials. The moving speed of the trolley is between 20m-60m / min, which is relatively slow, increasing the waiting time and reducing the production efficiency. SUMMARY

[0004] The utility model discloses a double-beam hoisting device that has a short waiting time for the movement of the trolley and a fast hoisting speed. It effectively solves the problem of long waiting time for the movement of the trolley in a wide space such as a workshop or warehouse, which reduces the hoisting efficiency.

[0005] The utility model discloses a double-beam hoisting device, including fixed setting in the upper part of workshop both sides longitudinal beam, the upper end surface of each longitudinal beam all fixedly set with first car track, the both ends of car frame all are with corresponding first car track sliding connection through first gyro wheel;The upper end surface of car frame is fixedly set with second car track along left and right direction, the both ends of hoisting trolley are with corresponding second car track sliding connection through second gyro wheel;Hoisting trolley is provided with winch and power motor, and the output shaft of power motor is fixedly set with winch, and winch is wound with steel wire rope;Steel wire rope is provided with lifting hook.

[0006] Further, the hoisting trolley is provided with two.

[0007] Further, the lower end surface of the left hoisting trolley is fixedly provided with a sleeve, the lower end surface of the right hoisting trolley is fixedly provided with an inner rod, the inner rod is sleeved in the sleeve, the left end of the inner rod is provided with a locking structure for realizing the position fixing and mutual sliding of the inner rod and the sleeve, when the locking structure is opened, the inner rod and the sleeve keep position fixed to form a whole, when the locking structure is closed, the inner rod and the sleeve are released from position fixing to realize mutual sliding, and the right end of the sleeve extends to the right relative to the hoisting trolley by a set length.

[0008] Further, the locking structure comprises three outer petals and three inner petals connected to the left end surface of the inner rod in a radial sliding manner, the three outer petals and the three inner petals are staggered, a mandrel is slidingly arranged along the axis of the inner rod between the three outer petals, the outer surface of the mandrel is provided with six inclined surfaces, the inner side surface of each outer petal is adapted to the corresponding inclined surface of the mandrel and is slidingly connected along the inclined direction of the inclined surface, and the inner side surface of each inner petal is adapted to the corresponding inclined surface of the mandrel and is slidingly connected along the inclined direction of the inclined surface; the radial angle between the inclined surface and the left end surface of the inner rod is a, and the angle a of the inclined surface of the mandrel adapted to the outer petal is greater than the angle a of the inclined surface of the mandrel adapted to the inner petal.

[0009] Further, the inner part of the left end of the inner rod is fixedly provided with a hydraulic telescopic rod, the output shaft of the hydraulic telescopic rod protrudes from the left end surface of the inner rod and is fixedly arranged with the bottom surface of the mandrel.

[0010] Further, the inclined surface of the mandrel is fixedly provided with a dovetail guide rail, the inner side surface of each inner petal and each outer petal is provided with a dovetail groove, each inner petal is slidingly connected with the mandrel through the cooperation of the dovetail groove and the corresponding dovetail guide rail, and each outer petal is slidingly connected with the mandrel through the cooperation of the dovetail groove and the corresponding dovetail guide rail.

[0011] Further, the left end surface of the inner rod is fixedly provided with six sliding rails in a radial direction, the inner side surface of each inner petal and outer petal near the inner rod is provided with a sliding groove, and each inner petal and outer petal is slidingly connected with the inner rod through the cooperation of its own sliding groove and the corresponding sliding rail.

[0012] Further, the frame comprises two cross beams and a first L-shaped rod fixedly arranged at the two ends of the cross beam, a mounting seat fixedly arranged with the two first L-shaped rods on the same side is arranged above each first rail, a first roller is rotatably connected to the lower end surface of the corresponding mounting seat, a first motor is fixedly arranged on the inner side surface of the mounting seat, the output shaft of the first motor is fixedly arranged with the corresponding first roller, and the mounting seat is slidingly connected with the corresponding first rail through the first roller.

[0013] Further, the hoisting trolley comprises two base rods and a second L-shaped rod fixedly arranged at the two ends of the base rod, a sliding seat fixedly arranged with the two second L-shaped rods on the same side is arranged above the second rail, a second roller is rotatably connected to the lower end surface of the corresponding sliding seat, a second motor is fixedly arranged on the inner side surface of the sliding seat, the output shaft of the second motor is fixedly arranged with the corresponding second roller, and the sliding seat is slidingly connected with the corresponding second rail through the second roller; a power motor is fixedly arranged on the upper end surface of one of the base rods; a fixed block is fixedly arranged on the upper end surface of the other base rod, one end of the rotating shaft of the winch is rotatably connected with the fixed block, and the other end of the rotating shaft of the winch is fixedly arranged with the output shaft of the power motor.

[0014] The utility model discloses a vehicle frame and hoist trolley are set up, in the use of the device, can choose hoist trolley nearby according to the material of on -the -spot hoisting, effectively shorten the time of hoist trolley left and right movement, improve hoisting efficiency, simultaneously, two hoist trolleys can be used simultaneously alone, do not interfere with each other, further improve the production efficiency.

[0015] The utility model discloses a sleeve, inner rod and locking structure are set up, in the use of the device, when locking structure opens, inner rod and sleeve keep position fixed and form a whole, when moving left hoist trolley or right hoist trolley, two hoist trolleys are all simultaneously synchronous left and right movement, when locking structure closes, inner rod and sleeve realize mutual sliding, when two hoist trolleys are regarded as two separate individuals, can be operated respectively two hoist trolleys and carry out hoisting operation, if two hoist trolleys move close to each other when the right -end of sleeve and right hoist trolley abut, two hoist trolleys 6 are limited, can not further close to each other, prevent when two hoist trolleys operate alone, two hoist trolleys produce the collision. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is whole three -dimensional structure schematic diagram of the utility model;

[0017] Figure 2 It is front view structure schematic diagram of the utility model;

[0018] Figure 3 It is three -dimensional structure schematic diagram of vehicle frame in the utility model;

[0019] Figure 4 It is three -dimensional structure schematic diagram of second vehicle rail in the utility model;

[0020] Figure 5 It is three -dimensional structure schematic diagram of power motor in the utility model;

[0021] Figure 6 It is front view structure schematic diagram of power motor in the utility model;

[0022] Figure 7 It is three -dimensional structure schematic diagram of sleeve interior in the utility model;

[0023] Figure 8 It is three -dimensional structure schematic diagram of the utility model in Figure 7 It is the structure amplification schematic diagram of A in the utility model;

[0024] Figure 9 It is three -dimensional structure schematic diagram of outer petal and inner petal in the utility model;

[0025] Figure 10 It is three -dimensional structure schematic diagram of mandrel in the utility model;

[0026] Figure 11 It is the overhead structure schematic view of the mandrel in the utility model.

[0027] In the figure, 1, longitudinal beam; 2, first track; 3, frame; 4, first roller; 5, second track; 6, hoist trolley; 7, second roller; 8, winding drum; 9, power motor; 10, wire rope; 11, lifting hook; 12, sleeve; 13, inner rod; 14, outer petal; 15, inner petal; 16, mandrel; 17, inclined plane; 18, hydraulic telescopic rod; 19, dovetail guide rail; 20, slide rail; 21, crossbeam; 22, first L rod; 23, mounting seat; 24, first motor; 25, bottom rod; 26, second L rod; 27, sliding seat; 28, second motor; 29, fixed block. DETAILED DESCRIPTION

[0028] Please refer to Figures 1-11 , the following will be described in detail with the utility model in combination with the drawings and examples:

[0029] The double-beam hoisting device, comprising longitudinal beams 1 fixedly arranged on the upper portions of both sides of a workshop, first tracks 2 fixedly arranged on the upper end faces of each longitudinal beam 1, the two ends of a frame 3 slidably connected with the corresponding first tracks 2 through first rollers 4, second tracks 5 fixedly arranged on the upper end faces of the frame 3 in the left-right direction, the two ends of a hoist trolley 6 slidably connected with the corresponding second tracks 5 through second rollers 7, a winding drum 8 and a power motor 9 arranged on the hoist trolley 6, the output shaft of the power motor 9 fixedly arranged with the winding drum 8, a wire rope 10 wound on the winding drum 8, the power motor 9 driving the winding drum 8 to rotate, the winding drum 8 releasing or winding the wire rope 10, and then lifting a lifting hook 11.

[0030] In use, the frame 3 can move forward and backward on the longitudinal beams 1, and the hoist trolley 6 can move left and right on the frame 3, so that the hoist trolley 6 can quickly move to the upper portion of the material to be lifted during operation, the power motor 9 drives the winding drum 8 to release the wire rope 10, so that the lifting hook 11 falls to lift the material, and then the frame 3 moves forward and backward and the hoist trolley 6 moves left and right to hoist and transport the material to the set position.

[0031] In the embodiment, the hoist trolley 6 is provided with two hoist trolleys 6; the two hoist trolleys 6 can jointly complete the hoisting and transporting of the material, or can be used separately to hoist and transport the material; in use, the hoist trolley 6 on which side is used to hoist and transport the material to be transferred, effectively shortening the time of left and right movement of the hoist trolley 6 and improving the hoisting efficiency, and at the same time, the two hoist trolleys 6 can be used simultaneously and independently without interference, further improving the production efficiency.

[0032] In daily production, two lifting trolleys 6 are used, and due to the negligence of workers or improper operation, accidents of mutual collision occur. Meanwhile, when two lifting trolleys 6 simultaneously hoist the same material, the two lifting trolleys 6 need to be synchronously moved, and the operation is difficult. In order to solve this problem:

[0033] In the embodiment, the lower end surface of the left lifting trolley 6 is fixedly provided with a sleeve 12, and the lower end surface of the right lifting trolley 6 is fixedly provided with an inner rod 13. The inner rod 13 is sleeved in the sleeve 12. The left end of the inner rod 13 is provided with a locking structure for realizing the position fixing and mutual sliding of the inner rod 13 and the sleeve 12. When the locking structure is opened, the inner rod 13 and the sleeve 12 are positionally fixed to form an integral whole. When the locking structure is closed, the inner rod 13 and the sleeve 12 are positionally released to realize mutual sliding. The right end of the sleeve 12 extends to the right relative to the lifting trolley 6 by a set length.

[0034] In use, when the locking structure is opened, the inner rod 13 and the sleeve 12 are positionally fixed to form an integral whole. At this time, the left lifting trolley 6 or the right lifting trolley 6 is moved, and the two lifting trolleys 6 are simultaneously and synchronously moved left and right. When the locking structure is closed, the inner rod 13 and the sleeve 12 realize mutual sliding. At this time, the two lifting trolleys 6 are regarded as two separate individuals, and the two lifting trolleys 6 can be operated respectively for hoisting operation. At this time, if the two lifting trolleys 6 are moved to approach each other, when the right end of the sleeve 12 abuts against the right lifting trolley 6, the two lifting trolleys 6 are limited and cannot further approach each other, thereby preventing the two lifting trolleys 6 from colliding when the two lifting trolleys 6 are operated separately.

[0035] The simultaneous and synchronous left and right movement of the two lifting trolleys 6 is mostly used when the two lifting trolleys 6 hoist the same material through the lifting hooks 11. First, the two lifting trolleys 6 are independently moved to adjust the position. After the two lifting hooks 11 fix the same material, the locking structure is opened, the two lifting trolleys 6 are fixed to form an integral whole, the frame 3 is moved forward and backward to a set position, and then the two lifting trolleys 6 are synchronously moved left and right to adjust the position of the material. After the position is adjusted, the material is released and placed at the set position.

[0036] Through the sleeve 12, the inner rod 13 and the locking structure, the simultaneous movement of the two lifting trolleys 6 is realized, and the purpose of preventing the mutual collision of the two lifting trolleys 6 as two individuals is also realized.

[0037] In the embodiment, the locking structure comprises three outer petals 14 and three inner petals 15 connected to the left end surface of the inner rod 13 in a radial sliding manner, the three outer petals 14 and the three inner petals 15 are arranged alternately, a mandrel 16 is arranged between the three outer petals 14 in a sliding manner along the axis of the inner rod 13, six inclined surfaces 17 are formed on the outer surface of the mandrel 16, the inner side surface of each outer petal 14 is adapted to the corresponding inclined surface 17 of the mandrel 16 and is connected in a sliding manner along the inclined direction of the inclined surface 17, and the inner side surface of each inner petal 15 is adapted to the corresponding inclined surface 17 of the mandrel 16 and is connected in a sliding manner along the inclined direction of the inclined surface 17; the included angle a between the inclined surface 17 and the radial direction of the left end surface of the inner rod 13, the included angle a of the inclined surface 17 of the mandrel 16 adapted to the inner petal 15 is greater than the included angle a of the inclined surface 17 of the mandrel 16 adapted to the outer petal 14; in use, the mandrel 16 is driven to move in the direction of the inner rod 13, that is, the mandrel 16 moves to the right, since the mandrel 16 is connected to each inner petal 15 and each outer petal 14 in a sliding manner, the mandrel 16 forces each inner petal 15 and each outer petal 14 to move inward along the radial direction of the inner rod 13, since the inclination of the inclined surface 17 of the mandrel 16 matched with the inner petal 15 is greater than the inclination of the inclined surface 17 of the mandrel 16 matched with the outer petal 14, the moving speed of the inner petal 15 inward is greater than the moving speed of the outer petal 14 inward, when all the outer petals 14 move inward, the gap between each adjacent two outer petals 14 is reduced, the inner petal 15 moves inward at a faster speed, does not interfere with the inward movement of the outer petal 14, and achieves the purpose of moving all the inner petals 15 and the outer petals 14 inward, when the inner petal 15 and the outer petal 14 move inward, the outer surface of each inner petal 15 and each outer petal 14 is separated from the inner side wall of the sleeve 12, the locking structure is closed, and the inner rod 13 and the sleeve 12 are arranged in a sliding manner; when the mandrel 16 moves away from the left side surface of the inner rod 13, the mandrel 16 forces each inner petal 15 and each outer petal 14 to move outward, so that the outer surface of each inner petal 15 and each outer petal 14 is in contact with the inner side wall of the sleeve 12, and the inner rod 13 and the sleeve 12 are kept in a fixed position, at this time, the inner rod 13 and the sleeve 12 form an integral whole, and the two lifting trolleys 6 move synchronously and simultaneously.

[0038] In order to achieve the purpose of driving the mandrel 16 to move left and right along the axis of the inner rod 13, in the embodiment, a hydraulic telescopic rod 18 is fixedly arranged in the inner part of the left end of the inner rod 13, the output shaft of the hydraulic telescopic rod 18 protrudes from the left end surface of the inner rod 13 and is fixedly arranged with the bottom surface of the mandrel 16; the hydraulic telescopic rod 18 drives the mandrel 16 to move left and right through the output shaft; the oil inlet and outlet pipes of the hydraulic telescopic rod 18 can be arranged in the inner rod 13 and protrude from the right end of the inner rod 13 to be connected with the total oil pipe.

[0039] When in use, the existing double-beam lifting device is provided with a controller, the controller is provided with a left lifting trolley 6 moving key, a right lifting trolley 6 moving key and a synchronization key, and when the synchronization key is pressed, the left lifting trolley 6 and the right lifting trolley 6 are synchronously moved no matter the left lifting trolley 6 moving key or the right lifting trolley 6 moving key is pressed.

[0040] In the embodiment, the dovetail guide rails 19 are fixedly arranged on the inclined surfaces 17 of the mandrels 16, the inner sides of each inner petal 15 and each outer petal 14 are provided with dovetail grooves, each inner petal 15 is slidably connected with the corresponding mandrel 16 through the dovetail groove and the corresponding dovetail guide rail 19, and each outer petal 14 is slidably connected with the corresponding mandrel 16 through the dovetail groove and the corresponding dovetail guide rail 19; when the mandrels 16 move left and right, the mandrels 16 drive each inner petal 15 and each outer petal 14 to move inward or outward along the radial direction of the inner rod 13 through the dovetail guide rails 19.

[0041] In the embodiment, the left end surface of the inner rod 13 is fixedly provided with six slide rails 20 along the radial direction, and the side surface close to the inner rod 13 of each inner petal 15 and outer petal 14 is provided with a sliding groove, and each inner petal 15 and outer petal 14 is slidably connected with the inner rod 13 through the sliding groove and the corresponding slide rail 20.

[0042] In the embodiment, the frame 3 includes two cross beams 21 and first L-shaped rods 22 fixedly arranged at the two ends of the cross beams 21, the upper side of each first trolley rail 2 is provided with a mounting seat 23 fixedly arranged with the two first L-shaped rods 22 on the same side, the first roller 4 is rotationally connected to the lower end surface of the corresponding mounting seat 23, the inner side surface of the mounting seat 23 is fixedly provided with a first motor 24, the output shaft of the first motor 24 is fixedly arranged with the corresponding first roller 4, and the mounting seat 23 is slidably connected with the corresponding first trolley rail 2 through the first roller 4; the first motor 24 drives the corresponding first roller 4 to rotate, so that the first roller 4 rolls on the first trolley rail 2 to drive the mounting seat 23 to move back and forth, thereby driving the two cross beams 21 to move back and forth.

[0043] In the embodiment, the lifting trolley 6 comprises two bottom rods 25 and second L rods 26 fixedly arranged at both ends of the bottom rods 25, the upper portion of the second trolley rail 5 is provided with sliding seats 27 fixedly arranged with the two second L rods 26 on the same side, the second rollers 7 are rotationally connected to the lower end faces of the corresponding sliding seats 27, the inner side faces of the sliding seats 27 are fixedly provided with second motors 28, the output shafts of the second motors 28 are fixedly arranged with the corresponding second rollers 7, and the sliding seats 27 are slidingly connected with the corresponding second trolley rails 5 through the second rollers 7; the second motor 28 drives the corresponding second roller 7 to rotate, so that the second roller 7 rolls on the second trolley rail 5, and then drives the sliding seat 27 to slide left and right on the second trolley rail 5, and then drives the bottom rod 25 to move left and right; the power motor 9 is fixedly arranged on the upper end face of one of the bottom rods 25; the upper end face of the other bottom rod 25 is fixedly provided with a fixed block 29, one end of the rotating shaft of the winch 8 is rotationally connected with the fixed block 29, and the other end of the rotating shaft of the winch 8 is fixedly arranged with the output shaft of the power motor 9.

[0044] The first motor 24 drives the corresponding first roller 4 to rotate, so that the first roller 4 rolls on the first trolley rail 2 to drive the mounting seat 23 to move forward and backward, and then drives the two cross beams 21 to move forward and backward, and the two cross beams 21 drive the winch 8 to move forward and backward through the bottom rod 25; the second motor 28 drives the corresponding second roller 7 to rotate, so that the second roller 7 rolls on the second trolley rail 5 to drive the sliding seat 27 to slide left and right on the second trolley rail 5, and then drive the bottom rod 25 to move left and right, and the bottom rod 25 drives the winch 8 to move left and right; and then the winch 8 drives the material to move forward and backward and left and right through the lifting hook 11, so as to realize the lifting of the material.

[0045] The working principle of the utility model is: when two lifting trolleys 6 lift the same material through the lifting hooks 11, first, the two lifting trolleys 6 move independently to adjust the position, after the two lifting hooks 11 fix the same material, the hydraulic telescopic rod 18 drives the mandrel 16 to move left, so that each outer petal 14 and each inner petal 15 move outward to abut against the inner side wall of the sleeve 12, realize the mutual fixation of the inner rod 13 and the sleeve 12, the two lifting trolleys 6 are fixedly formed into a whole, the frame 3 moves forward and backward to the set position, then the two lifting trolleys 6 move left and right synchronously, adjust the position of the material, and then release the material after the position is adjusted and place it in the set position.

Claims

1. A double-beam lifting device, comprising longitudinal beams (1) fixedly installed on the upper part of both sides of a workshop, characterized in that: Each longitudinal beam (1) has a first rail (2) fixedly installed on its upper end face. Both ends of the frame (3) are slidably connected to the corresponding first rail (2) via first rollers (4). A second rail (5) is fixedly installed on the upper end face of the frame (3) in the left-right direction. Both ends of the crane trolley (6) are slidably connected to the corresponding second rail (5) via second rollers (7). The crane trolley (6) is equipped with a winch (8) and a power motor (9). The output shaft of the power motor (9) is fixedly installed with the winch (8). A wire rope (10) is wound on the winch (8). The wire rope (10) is equipped with a hook (11). There are two crane trolleys (6).

2. The double-beam lifting device according to claim 1, characterized in that: A sleeve (12) is fixedly installed on the lower end face of the left trolley (6), and an inner rod (13) is fixedly installed on the lower end face of the right trolley (6). The inner rod (13) is sleeved inside the sleeve (12). A locking structure is provided at the left end of the inner rod (13) to realize the switching between two states of fixed position and mutual sliding between the inner rod (13) and the sleeve (12). When the locking structure is open, the inner rod (13) and the sleeve (12) remain fixed in position and form a whole. When the locking structure is closed, the inner rod (13) and the sleeve (12) are released from fixed position and realize mutual sliding. The right end of the sleeve (12) extends to the right by a set length relative to the trolley (6).

3. The double-beam lifting device according to claim 2, characterized in that: The locking structure includes three outer lobes (14) and three inner lobes (15) that are radially slidably connected to the left end face of the inner rod (13). The three outer lobes (14) and three inner lobes (15) are staggered. A spindle (16) is slidably arranged between the three outer lobes (14) along the axis of the inner rod (13). The outer surface of the spindle (16) has six inclined surfaces (17). The inner surface of each outer lobe (14) is adapted to the inclined surface (17) corresponding to the spindle (16). The inner surface of each inner lobe (15) is adapted to the inclined surface (17) of the mandrel (16) and is slidably connected along the inclined direction of the inclined surface (17); the radial angle between the inclined surface (17) and the left end face of the inner rod (13) is a, and the angle a of the inclined surface (17) of the mandrel (16) adapted to the outer lobe (14) is greater than the angle a of the inclined surface (17) of the mandrel (16) adapted to the inner lobe (15).

4. The double-beam lifting device according to claim 3, characterized in that: A hydraulic telescopic rod (18) is fixedly installed inside the left end of the inner rod (13). The output shaft of the hydraulic telescopic rod (18) protrudes from the left end face of the inner rod (13) and is fixedly installed with the bottom surface of the spindle (16).

5. The double-beam lifting device according to claim 3, characterized in that: The mandrel (16) is fixedly provided with dovetail guide rails (19) on its inclined surface (17). Each inner lobe (15) and each outer lobe (14) has a dovetail groove on its inner side. Each inner lobe (15) is slidably connected to the mandrel (16) through the dovetail groove and the corresponding dovetail guide rail (19). Each outer lobe (14) is slidably connected to the mandrel (16) through the dovetail groove and the corresponding dovetail guide rail (19).

6. The double-beam lifting device according to claim 3, characterized in that: The left end face of the inner rod (13) is fixed with six slide rails (20) along the radial direction. Each inner lobe (15) and outer lobe (14) has a sliding groove on the side of the inner rod (13) that is close to it. Each inner lobe (15) and outer lobe (14) is slidably connected to the inner rod (13) through its own sliding groove and the corresponding slide rail (20).

7. The double-beam lifting device according to claim 1, characterized in that: The frame (3) includes two crossbeams (21) and first L rods (22) fixedly installed at both ends of the crossbeams (21). Each first rail (2) is provided with a mounting seat (23) fixedly installed above the two first L rods (22) on the same side. A first roller (4) is rotatably connected to the lower end face of the corresponding mounting seat (23). A first motor (24) is fixedly installed on the inner side of the mounting seat (23). The output shaft of the first motor (24) is fixedly installed with the corresponding first roller (4). The mounting seat (23) is slidably connected to the corresponding first rail (2) through the first roller (4).

8. The double-beam lifting device according to claim 1, characterized in that: The lifting trolley (6) includes two base rods (25) and two second L rods (26) fixedly installed at both ends of the base rods (25). A slide (27) is fixedly installed above the second rail (5) and fixedly installed with the two second L rods (26) on the same side. A second roller (7) is rotatably connected to the lower end face of the corresponding slide (27). A second motor (28) is fixedly installed on the inner side of the slide (27). The output shaft of the second motor (28) is fixedly installed with the corresponding second roller (7). The slide (27) is slidably connected with the corresponding second rail (5) through the second roller (7). A power motor (9) is fixedly installed on the upper end face of one of the base rods (25). A fixing block (29) is fixedly installed on the upper end face of the other base rod (25). One end of the rotating shaft of the winch (8) is rotatably connected with the fixing block (29). The other end of the rotating shaft of the winch (8) is fixedly installed with the output shaft of the power motor (9).

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