A precise positioning gantry crane and a method of using the same

Abstract

The present invention belongs to the technical field of cranes, and specifically discloses a precisely positioned gantry crane and a method for using the gantry crane, comprising a mounting frame, both sides of the bottom of the mounting frame are fixedly connected to support frames, the outside of the mounting frame is slidably connected to a moving mechanism, the bottom of the moving mechanism is provided with a winding and hoisting mechanism, the outside of the winding and hoisting mechanism is provided with a protective mechanism, the top of the protective mechanism is provided with a positioning auxiliary mechanism, the moving mechanism comprises a sliding groove, the sliding groove is opened at the top of the mounting frame, the inside of the sliding groove is slidably connected to a sliding plate, and one side of the sliding plate is fixedly connected to a reducer. Through the cooperation of the winding and hoisting mechanism and the protective mechanism, the steel rope can be isolated from the outside air by using anti-rust grease, so that the steel rope can be prevented from rusting, and then the service life of the crane steel rope can be increased to avoid economic losses.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and specifically discloses a precisely positioned gantry crane and a use method thereof. Background Art

[0002] Gantry crane is a kind of lifting equipment widely used in outdoor cargo yards, material yards, ports and other places. Its metal structure is similar to a door-shaped frame and can travel directly on the ground track. Gantry crane has the characteristics of high site utilization, large operating range, wide adaptability and strong versatility. According to the different structures and uses, gantry cranes can be divided into many types, such as full gantry cranes, semi-gantry cranes, double-cantilever gantry cranes, single-cantilever gantry cranes, etc. In addition, gantry cranes can also be divided into single-girder and double-girder structures according to the main beam form, and divided into ordinary gantry cranes, hydropower station gantry cranes, shipbuilding gantry cranes and container gantry cranes according to the use form.

[0003] Cranes in the prior art generally use a power mechanism to drive the steel rope to reel in, so that it can play the role of lifting objects and then achieve the purpose of lifting. However, current cranes generally do not have the function of protecting the steel rope. After being used in places with heavy humidity, the steel rope is prone to rust, resulting in a reduction in service life, thereby causing economic losses. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a precisely positioned gantry crane and a method of using the same, so as to solve the problem in the prior art that the steel rope of the crane has no protective function, reduces the service life of the steel rope, and causes economic losses.

[0005] In order to achieve the above objectives, the present invention provides a precisely positioned gantry crane, comprising an installation frame, support frames are fixedly connected to both sides of the bottom of the installation frame, a moving mechanism is slidably connected to the outside of the installation frame, a winding and lifting mechanism is arranged at the bottom of the moving mechanism, a protective mechanism is arranged at the outside of the winding and lifting mechanism, a positioning auxiliary mechanism is arranged at the top of the protective mechanism, two moving wheels are fixedly connected to the bottom of the support frame, and two stabilizing bars are fixedly connected to the outer bottom end of the support frame.

[0006] The transmission gear of the present invention is a gear selected from the group consisting of a gearbox and a gearbox, wherein the gearbox is connected to a gearbox on a top side of the gearbox and a gearbox is connected to the gearbox on a bottom side thereof.

[0007] In the above technical solution, preferably, the winding and lifting mechanism includes a mounting frame, sliding grooves are provided on the inner sides of both ends of the mounting frame, and sliding blocks are slidably connected inside the sliding grooves, wherein an electric motor is fixedly connected to the outer side of one of the sliding blocks, and a winding cotton surface roller is rotatably connected between the two sliding blocks, the output end of the motor is fixedly connected to one side of the winding cotton surface roller, and a clamping rod is fixedly connected to the outside of the winding cotton surface roller.

[0008] The top of the oil filling tank is fixedly connected with a mounting cylinder, and a plurality of through holes are provided on the top of the outer circumference of the mounting cylinder. A sealing plug is slidably connected to the inside of the mounting cylinder, and an oil through hole is provided on the inside of the sealing plug. The bottom of the sealing plug is fixedly connected with an oil leakage pipe, and the outer sleeve of the oil leakage pipe is sleeved with a strong tension spring 1, the bottom of the oil leakage pipe is fixedly connected with an electric valve, the bottom of the electric valve is fixedly connected with an oil passing elbow, the bottom of the oil passing elbow is rotatably connected to the side of the winding cotton surface roller away from the motor, the bottom of the reducer is fixedly connected with a fixing cylinder, the inside of the fixing cylinder is fixedly connected with a strong tension spring 2, the bottom of the strong tension spring 2 is fixedly connected with a limiting block, the bottom of the limiting block is fixedly connected with a connecting column, the bottom of the connecting column is fixedly connected to the top of the motor, and the top of the oil filling tank is fixedly connected with an oil filling pipe.

[0009] In the above technical solution, preferably, the positioning auxiliary mechanism includes a bending frame, which is rotatably connected to the top of the mounting frame, a clamp is fixedly connected to the top of one side of the bending frame, a reset spring is fixedly connected to one side of the bottom of the bending frame, the bottom of the reset spring is fixedly connected to the top of the mounting frame, and a plurality of scale slots are provided at the bottom of the mounting frame, and the clamp is engaged with the scale slots.

[0010] In the above technical solution, preferably, the bottom of the high-force tension spring 1 is fixedly connected to the inner bottom end of the mounting tube, and the top of the high-force tension spring 1 is fixedly connected to the bottom of the sealing plug.

[0011] In the above technical solution, preferably, the limit block is slidably connected to the inside of the fixed cylinder, and the through hole is arranged inside the oil tank.

[0012] In the above technical solution, preferably, a closing cap is threadedly connected to the top of the oil filling pipe, and a rubber sleeve is provided on the outer sleeve of the closing plug.

[0013] A method for using a precisely positioned gantry crane, according to a precisely positioned gantry crane according to any one of claims 1 to 8, characterized in that it includes the following method of use:

[0014] Step 1: Start the motor to make the steel rope on the cotton winding roller fall down, and after lifting the object, start the motor again to move the object upward;

[0015] Step 2: When the object moves upward in step 1, the weight of the winding cotton roller increases, so the protective mechanism can be used to drip lubricating oil, so as to oil the steel rope and prevent the steel rope from rusting and damage;

[0016] Step 3: Start the motor to allow the crane to move the object. The design of the helical gear makes the movement smoother and the moving distance more accurate. The positioning auxiliary mechanism is used to achieve precise positioning.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention cooperates with the winding hoisting mechanism and the protective mechanism, thereby achieving the goal of soaking the winding cotton surface roller with rust-proof grease when lifting heavy objects, and then applying the grease to the steel rope through the winding of the steel rope, so that the steel rope can be isolated from the outside air by the rust-proof grease, thereby preventing the steel rope from rusting, and then increasing the service life of the crane steel rope and avoiding economic losses.

[0019] The present invention can move smoothly through the cooperation of the helical gear and the helical rack. At the same time, through the clamping head and the scale clamping slot, the clamping head can be continuously engaged with the scale clamping slot during movement to check whether it has moved into place, and the moving position can be checked through the scale to achieve accurate positioning, thereby improving the efficiency and safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the helical gear in the present invention;

[0022] Figure 3 It is a structural schematic diagram of the clamping wheel in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the stabilizing wheel in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the positioning auxiliary mechanism in the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the sealing plug in the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the limit block in the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the scale slot in the present invention.

[0028] In the figure: 1, mounting frame; 2, support frame; 3, moving mechanism; 301, sliding groove; 302, sliding plate; 303, speed reducer; 304, motor; 305, rotating column; 306, clamping wheel; 307, helical gear; 308, mounting stabilizer bar; 309, stabilizing wheel; 310, helical rack; 311, sliding clamping groove; 4, winding lifting mechanism; 401, mounting frame; 402, sliding groove; 403, sliding block; 404, motor; 405, winding cotton roller; 406, clamping rod; 5, anti- Protection mechanism; 501, oil tank; 502, installation cylinder; 503, through hole; 504, sealing plug; 505, oil hole; 506, strong tension spring 1; 507, oil leakage pipe; 508, oil elbow; 509, electric valve; 510, fixing cylinder; 511, strong tension spring 2; 512, limit block; 513, connecting column; 514, oil filling pipe; 6, positioning auxiliary mechanism; 601, bending frame; 602, clamping head; 603, reset tension spring; 604, scale slot; 7, moving wheel; 8, stabilizer bar. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1-Figure 8 A precisely positioned gantry crane is shown, comprising an installation frame 1, which plays a role in installation. Both sides of the bottom of the installation frame 1 are fixedly connected with support frames 2, which can play a role in installation support. The outside of the installation frame 1 is slidably connected with a moving mechanism 3, and a winding and hoisting mechanism 4 is provided at the bottom of the moving mechanism 3, which can wind up the steel rope. A protective mechanism 5 is provided on the outside of the winding and hoisting mechanism 4, which can grease the steel rope to prevent rust. A positioning auxiliary mechanism 6 is provided on the top of the protective mechanism 5, which can play a role in positioning. Two moving wheels 7 are fixedly connected to the bottom of the support frame 2, and the moving wheels 7 facilitate the movement of the device. Two stabilizing bars 8 are fixedly connected to the outer bottom end of the support frame 2, and the stabilizing bars 8 play a role in stabilizing the device.

[0032] The moving mechanism 3 includes a sliding groove 301, which is opened on the top of the installation frame 1. The sliding groove 301 is slidably connected to a sliding plate 302. The sliding plate 302 slides inside the sliding groove 301, so that it can play a role in installation without delaying sliding. A reducer 303 is fixedly connected to one side of the sliding plate 302. A motor 304 is fixedly connected to the side of the reducer 303 away from the sliding groove 301. The output end of the motor 304 is fixedly connected to the input end of the reducer 303. The output end of the reducer 303 is fixedly connected to a rotating column 305. The rotating column 305 can play a role in transmitting power. The outside of the rotating column 305 is fixedly connected to a card wheel 306. The card wheel 306 can slide inside the sliding card groove 311. The outside of the rotating column 305 is located on one side of the card wheel 306 and is fixedly connected to a helical gear 307. The outside of the rotating column 305 and the outside of the reducer 303 are both fixed Two mounting stabilizer bars 308 are connected, and a stabilizing wheel 309 is fixedly connected to the opposite side of the mounting stabilizer bar 308. The mounting stabilizer bar 308 and the stabilizing wheel 309 cooperate to play the role of installation and can reduce the burden of the sliding groove 301 and the sliding plate 302. The stabilizing wheel 309 is slidably connected to the inner bottom end of the mounting frame 1, and a helical rack 310 is fixedly connected to the inner bottom end of the mounting frame 1. The helical gear 307 is engaged with the helical rack 310. A sliding card slot 311 is provided in the middle of the mounting frame 1, and the middle part of the card wheel 306 is slidably connected to the inside of the sliding card slot 311. The motor 304 is started. After the motor 304 is started, the power can be transmitted to the reducer 303, and the speed is adjusted by the reducer 303, and then the helical gear 307 is driven to rotate by the reducer 303. After the helical gear 307 rotates, it cooperates with the helical rack 310 to move, thereby driving the suspended object to move.

[0033] The winding hoisting mechanism 4 includes a mounting frame 401, which serves the purpose of installation. Sliding grooves 402 are provided on the inner sides of both ends of the mounting frame 401. Sliding blocks 403 are slidably connected inside the sliding grooves 402. The sliding blocks 403 can slide in the sliding grooves 402, so that they can drive the sliding blocks 403 to move downward under the pressure of lifting the heavy objects. A motor 404 is fixedly connected to the outer side of one of the sliding blocks 403, and the motor 404 serves as the power for lifting. A winding cotton roller 405 is rotatably connected between the two sliding blocks 403, and the winding cotton roller 405 can serve as the function of winding the steel rope and can oil the steel rope. The output end of the motor 404 is fixedly connected to one side of the winding cotton roller 405, and a clamping rod 406 is fixedly connected to the outside of the winding cotton roller 405, and the clamping rod 406 can serve as the function of installing the steel rope. First, the steel rope is wound The rope is wound around the winding cotton surface roller 405. After the steel rope lifting object is fixed with the steel rope, the motor 404 is started. After the motor 404 rotates, it can drive the winding cotton surface roller 405 to rotate. After the winding cotton surface roller 405 rotates, the steel rope can be wound, so that the heavy object can be lifted. When the heavy object is lifted, due to the increase in weight, the winding cotton surface roller 405 moves downward, thereby driving the sliding block 403 to slide downward inside the sliding groove 402. Therefore, the protective mechanism 5 can be used to inject anti-rust oil into the interior of the winding cotton surface roller 405, which can be absorbed by the cotton cloth layer on the winding cotton surface roller 405, and then the steel rope wound on the winding cotton surface roller 405 can be oiled to prevent rust. When a lot of oil is injected into the winding cotton surface roller 405, it will drip from the winding cotton surface roller 405, so that grease can be applied to the outer steel rope to prevent the steel rope from rusting.

[0034] The protection mechanism 5 includes an oil tank 501, which can be filled with oil. The two sides of the bottom of the oil tank 501 are respectively fixedly connected to the top of the reducer 303 and the rotating column 305. The bottom of the oil tank 501 is fixedly connected with a mounting cylinder 502, which can play a role of installation. The top of the outer periphery of the mounting cylinder 502 is provided with a plurality of through holes 503, which can play a role of passing oil. The interior of the mounting cylinder 502 is slidably connected with a sealing plug 504, which plays a role of sealing. The interior of the sealing plug 504 is provided with an oil through hole 505, which can The bottom of the sealing plug 504 is fixedly connected with an oil leakage pipe 507, and the oil leakage pipe 507 serves to connect the oil circuit. The outer sleeve of the oil leakage pipe 507 is provided with a strong tension spring 506. The bottom of the oil leakage pipe 507 is fixedly connected with an electric valve 509. The bottom of the electric valve 509 is fixedly connected with an oil elbow 508. The oil elbow 508 serves as a connection. The bottom of the oil elbow 508 is rotatably connected to the side of the winding cotton roller 405 away from the motor 404. The bottom of the reducer 303 is fixedly connected with a fixed cylinder 510. The inside of the fixed cylinder 510 is fixedly connected with a strong tension spring 506. Spring 2 511, the bottom of the strong tension spring 2 511 is fixedly connected to the limit block 512, the bottom of the limit block 512 is fixedly connected to the connecting column 513, the connecting column 513 plays a connecting role, the bottom of the connecting column 513 is fixedly connected to the top of the motor 404, the top of the oil tank 501 is fixedly connected to the oil filling pipe 514, the oil filling pipe 514 plays the role of oil filling, the bottom of the strong tension spring 1 506 is fixedly connected to the inner bottom end of the installation cylinder 502, the top of the strong tension spring 1 506 is fixedly connected to the bottom of the sealing plug 504, the limit block 512 is slidably connected to the inside of the fixed cylinder 510, The through hole 503 is arranged inside the oil tank 501, and the top of the oil filling pipe 514 is threadedly connected with a closing cover. The outer sleeve of the sealing plug 504 is provided with a rubber sleeve. When the sliding block 403 moves downward, it will drive the oil elbow pipe 508, the electric valve 509 and the oil leakage pipe 507 to move downward, and then drive the sealing plug 504 to move downward. When the sealing plug 504 moves to the through hole 503, the anti-rust oil in the oil tank 501 will enter the interior of the oil leakage pipe 507 through the oil hole 505, and fall onto the winding cotton roller 405 through the oil elbow pipe 508, thereby realizing automatic oiling to prevent the steel rope from rusting.

[0035] The positioning auxiliary mechanism 6 includes a bending frame 601, which can play a role in installation. The bending frame 601 is rotatably connected to the top of the mounting frame 401. A clamping head 602 is fixedly connected to the top of one side of the bending frame 601. A reset spring 603 is fixedly connected to one side of the bottom of the bending frame 601. The reset spring 603 can drive the bending frame 601 to reset. The bottom of the reset spring 603 is fixedly connected to the top of the mounting frame 401. A plurality of scale slots 604 are provided at the bottom of the mounting frame 1. The clamping head 602 can be clamped in the inside of the scale slot 604 to play a role in clamping and positioning. The clamping head 602 is engaged with the scale slot 604. When the mounting bracket 401 moves, when the clamping head 602 passes through one of the scale slots 604, the clamping head 602 moves downward. When the clamping head 602 moves to the groove of the scale slot 604, the clamping head 602 can be tilted and reset under the pull of the reset spring 603, so that it can be engaged. The stop position can be determined according to the scale slot 604, and the sound of the engagement can be used to judge whether the clamping head 602 is inside the scale slot 604, thereby judging whether the stop position is accurate, thereby playing a role in precise positioning.

[0036] A method for using a precisely positioned gantry crane includes the following methods:

[0037] Step 1: Start the motor 404 to make the steel rope on the cotton winding roller 405 fall down, and after the object is lifted, start the motor 404 again to move the object upward;

[0038] Step 2: When the object moves upward in step 1, the weight of the winding cotton roller 405 increases, so the protective mechanism 5 can drip out lubricating oil, thereby oiling the steel rope to prevent the steel rope from rusting and damage;

[0039] Step 3: Start the motor 304 to make the crane drive the object to move, and due to the design of the helical gear, the movement is smoother and the moving distance is more accurate, and the positioning auxiliary mechanism 6 is used to achieve precise positioning.

[0040] Working principle: firstly, the steel rope is wound on the winding cotton roller 405, and after the steel rope lifting object is fixed with the steel rope, the motor 404 is started, and after the motor 404 rotates, it can drive the winding cotton roller 405 to rotate, and after the winding cotton roller 405 rotates, the steel rope can be wound, so that the heavy object can be lifted. When the heavy object is lifted, due to the increase in weight, the winding cotton roller 405 moves downward, thereby driving the sliding block 403 to slide downward inside the sliding groove 402, so that the protective mechanism 5 can be used to inject anti-rust oil into the winding cotton roller 405, which can be absorbed by the cotton cloth layer on the winding cotton roller 405, and then the steel rope wound on the winding cotton roller 405 can be oiled to prevent rust. When the oil injected into the winding cotton roller 405 is large, it will drip from the winding cotton roller 405, so that grease can be applied to the outer steel rope to prevent the steel rope from rusting.

[0041] When the sliding block 403 moves downward, it will drive the oil elbow 508, the electric valve 509 and the oil leakage pipe 507 to move downward, and then drive the sealing plug 504 to move downward. When the sealing plug 504 moves to the through hole 503, the anti-rust oil in the oil tank 501 will enter the interior of the oil leakage pipe 507 through the oil hole 505, and fall onto the winding cotton roller 405 through the oil elbow 508, so as to realize automatic oiling to prevent the steel rope from rusting.

[0042] When the mounting bracket 401 moves, when the clamping head 602 passes through one of the scale slots 604, the clamping head 602 moves downward, and when the clamping head 602 moves to the groove of the scale slot 604, the clamping head 602 can be tilted up and reset under the pull of the reset spring 603, so that it can be engaged. The stop position can be determined according to the scale slot 604, and the sound of the engagement can be used to judge whether the clamping head 602 is inside the scale slot 604, thereby judging whether the stop position is accurate, thereby playing a role in precise positioning.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A precisely positioned gantry crane, comprising a mounting frame (1), characterized in that: Both sides of the bottom of the installation frame (1) are fixedly connected to a support frame (2); the outside of the installation frame (1) is slidably connected to a moving mechanism (3); the bottom of the moving mechanism (3) is provided with a winding and lifting mechanism (4); the outside of the winding and lifting mechanism (4) is provided with a protection mechanism (5); the top of the protection mechanism (5) is provided with a positioning auxiliary mechanism (6); the bottom of the support frame (2) is fixedly connected to two moving wheels (7); and the outer bottom end of the support frame (2) is fixedly connected to two stabilizing rods (8); The winding and lifting mechanism (4) comprises a mounting frame (401), the inner sides of both ends of the mounting frame (401) are provided with sliding grooves (402), the interior of the sliding grooves (402) is slidably connected with sliding blocks (403), the outer side of one of the sliding blocks (403) is fixedly connected with a motor (404), a winding cotton surface roller (405) is rotatably connected between the two sliding blocks (403), the output end of the motor (404) is fixedly connected to one side of the winding cotton surface roller (405), and the outside of the winding cotton surface roller (405) is fixedly connected with a clamping rod (406); The protection mechanism (5) comprises an oil tank (501), the bottom sides of which are fixedly connected to the reducer (303) and the top of the rotating column (305), respectively; the bottom of the oil tank (501) is fixedly connected to a mounting cylinder (502), the top of the outer periphery of the mounting cylinder (502) is provided with a plurality of through holes (503); the interior of the mounting cylinder (502) is slidably connected to a sealing plug (504), the interior of the sealing plug (504) is provided with an oil through hole (505); the bottom of the sealing plug (504) is fixedly connected to an oil leakage pipe (507), the outer surface of the oil leakage pipe (507) is provided with a strong tension spring (506), and the bottom of the oil leakage pipe (507) is fixedly connected to an electric valve. (509), the bottom of the electric valve (509) is fixedly connected to an oil-passing elbow (508), the bottom of the oil-passing elbow (508) is rotatably connected to the side of the cotton-winding roller (405) away from the motor (404), the bottom of the reducer (303) is fixedly connected to a fixing cylinder (510), the interior of the fixing cylinder (510) is fixedly connected to a second strong tension spring (511), the bottom of the second strong tension spring (511) is fixedly connected to a limit block (512), the bottom of the limit block (512) is fixedly connected to a connecting column (513), the bottom of the connecting column (513) is fixedly connected to the top of the motor (404), and the top of the oil tank (501) is fixedly connected to an oil filling pipe (514); The positioning auxiliary mechanism (6) comprises a bending frame (601), the bending frame (601) is rotatably connected to the top of the mounting frame (401), a clamping head (602) is fixedly connected to the top of one side of the bending frame (601), a reset spring (603) is fixedly connected to one side of the bottom of the bending frame (601), the bottom of the reset spring (603) is fixedly connected to the top of the mounting frame (401), a plurality of scale slots (604) are provided at the bottom of the mounting frame (1), and the clamping head (602) is engaged with the scale slots (604); The bottom of the strong tension spring 1 (506) is fixedly connected to the inner bottom end of the installation tube (502), and the top of the strong tension spring 1 (506) is fixedly connected to the bottom of the sealing plug (504); The limiting block (512) is slidably connected to the interior of the fixing cylinder (510), and the through hole (503) is arranged inside the oil tank (501).

2. A precisely positioned gantry crane according to claim 1, characterized in that: The moving mechanism (3) comprises a sliding groove (301), wherein the sliding groove (301) is provided at the top of the installation frame (1), a sliding plate (302) is slidably connected inside the sliding groove (301), a reducer (303) is fixedly connected to one side of the sliding plate (302), a motor (304) is fixedly connected to the side of the reducer (303) away from the sliding groove (301), an output end of the motor (304) is fixedly connected to the input end of the reducer (303), a rotating column (305) is fixedly connected to the output end of the reducer (303), a clamping wheel (306) is fixedly connected to the outside of the rotating column (305), and the outside of the rotating column (305) is located at the clamping wheel (306) A helical gear (307) is fixedly connected to one side of the mounting frame (306); the outside of the rotating column (305) and the outside of the reducer (303) are both fixedly connected to two mounting stabilizing bars (308); a stabilizing wheel (309) is fixedly connected to the opposite side of the mounting stabilizing bar (308); the stabilizing wheel (309) is slidably connected to the inner bottom end of the mounting frame (1); a helical rack (310) is fixedly connected to the inner bottom end of the mounting frame (1); the helical gear (307) is engaged with the helical rack (310); a sliding slot (311) is provided in the middle of the mounting frame (1); and the middle of the clamping wheel (306) is slidably connected to the inside of the sliding slot (311).

3. The precise positioning gantry crane according to claim 1, characterized in that: The top of the oil filling pipe (514) is threadedly connected with a closing cap, and the outer sleeve of the closing plug (504) is provided with a rubber sleeve.

4. A method for using a precisely positioned gantry crane, according to the precisely positioned gantry crane of claim 2, characterized in that: Including the following usage: Step 1: Start the motor (404) to make the steel rope on the cotton winding roller (405) fall down, and after the object is lifted, start the motor (404) again to make the object move upward; Step 2: When the object moves upward in step 1, the weight of the cotton winding roller (405) increases, so the protective mechanism (5) can drip out lubricating oil, thereby oiling the steel rope to prevent the steel rope from rusting and damage; Step 3: Start the motor (304) to enable the crane to drive the object to move. Due to the design of the helical gear, the movement is smoother and the moving distance is more accurate. The positioning auxiliary mechanism (6) is used to achieve precise positioning.

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