Horizontal moving device and horizontal moving method for large-tonnage gantry type rack

Abstract

The invention relates to a horizontal moving device and method for a large-tonnage gantry type rack, and belongs to the technical field of gantry type racks. The horizontal moving device comprises a gantry state switching mechanism, a hydraulic system, a moving transmission mechanism and a gantry working platform; the portal frame state switching mechanism is arranged at the bottoms of stand columns of the gantry type rack and comprises jacking oil cylinders and rolling blocks, the rolling blocks are placed in through grooves in the bottoms of the stand columns and fall on a portal frame working platform below under the action of self weight, and idler wheels are arranged at the bottoms of the rolling blocks. The jacking oil cylinder is positioned above the rolling block; the hydraulic system controls the jacking oil cylinder to stretch out and draw back. The moving transmission mechanism is used for driving the gantry type rack to horizontally move on the gantry frame working platform; and the portal frame state switching mechanism is used for switching a stable supporting state and a rolling translation state of the gantry type rack. The horizontal moving method is carried out through the device, and the problems that in the prior art, a large-tonnage gantry type mechanical structure is difficult to move horizontally, and a moving platform is prone to being scratched are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of gantry frames, and in particular relates to a horizontal moving device and a horizontal moving method for a large-tonnage gantry frame. Background Art

[0002] With the rapid development of industrialization in my country, non-standard equipment used in various industries has gradually shown the characteristics of diversity, high automation and high precision. The large-scale application of non-standard equipment can effectively reduce the labor intensity of workers and improve the production efficiency of enterprises.

[0003] Large-tonnage non-standard equipment is mostly used in agricultural machinery, engineering machinery, mining machinery, etc. The weight of such non-standard equipment is generally tens of tons or even hundreds of tons, among which gantry-type mechanical structures are used more. In layman's terms, the gantry-type mechanical structure is a crossbeam connecting two legs and fastening them to the ground to form a structure like a door frame. The design of the moving mechanism of such non-standard equipment is very different from the design principles of those simple and lightweight non-standard equipment. For example, the friction mode of the moving mechanism must be considered when designing the horizontal moving mechanism and the large-tonnage gantry-type mechanical structure. Such horizontal moving mechanism, due to the heavy weight of the gantry-type mechanical structure, if there is sliding friction during movement, it will cause scratches or high-temperature sintering problems on the moving guide rails and sliders. For example, the utility model patent application "Tractor protection device test bench" published by the State Intellectual Property Office on May 29, 2018, with the announcement number: CN207423518U, provides a tractor protection device test bench, including: a gantry frame assembly, a cast iron plate assembly, a hydraulic station, etc. in the mechanical structure system. The main mechanical structure of the test bench is a gantry mechanical structure. This structure can slide on a cast iron plate fixed on the ground, and the sliding friction method is sliding friction. After actual installation testing, this design method is very easy to scratch the cast iron plate when moving, and long-term (about five minutes) movement will also cause problems such as heating, sintering of the contact surface, and even jamming.

[0004] Therefore, a rolling friction mechanism must be used for the horizontal movement mechanism of a large-tonnage gantry-type mechanical structure.

[0005] However, due to the large tonnage gantry mechanical structure, the self-weight, large force, high stability and deformation requirements, and the rolling friction mechanism due to its small contact surface area, it is difficult to meet the use requirements of the gantry mechanical structure, and it is inconvenient to use. At this time, it is necessary to increase the contact surface to ensure the force, that is, the rolling friction mechanism must be replaced to increase the contact surface. Therefore, the horizontal movement of the large tonnage gantry mechanical structure is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a horizontal moving device and method for a large-tonnage gantry frame, which solves the problem in the prior art that a large-tonnage gantry mechanical structure is difficult to move horizontally and is prone to scratching a moving platform.

[0007] In order to achieve the above-mentioned object, the first technical solution adopted by the present invention is: a horizontal moving device of a large-tonnage gantry frame, including a gantry state switching mechanism, a hydraulic system, a moving transmission mechanism and a gantry working platform; The gantry state switching mechanism is arranged at the bottom of the column of the gantry frame, and includes a lifting cylinder and a rolling block. The rolling block is movably placed in the through groove at the bottom of the column and can fall on the gantry working platform below under the action of its own weight. The rolling block is a square block, and a roller capable of rolling contact with the gantry working platform is arranged at the bottom thereof, and the roller rotates freely on the rolling block; the lifting cylinder is arranged above the rolling block; The hydraulic system is used to control the extension and retraction of the jacking cylinder; The mobile transmission mechanism is arranged between the upright column and the gantry working platform, and is used to drive the gantry frame to move horizontally on the gantry working platform; The gantry frame has a stable support state and a rolling translation state. When the gantry frame is in the stable support state, the bottom surface of the column is in contact with the gantry working platform, the cylinder rod of the jacking cylinder is retracted, and a gap is left between the cylinder rod and the upper surface of the rolling block; when the gantry frame is in the rolling translation state, the bottom surface of the column is out of contact with the gantry working platform, and the cylinder rod of the jacking cylinder is extended and pressed against the rolling block.

[0008] The beneficial effects are as follows: the present invention realizes the switching between the stable support state and the rolling translation state of the gantry frame by the gantry state switching mechanism, which can take into account the rolling friction required for the translation of the gantry frame and the large area of ​​stable support required for work; and the gantry state switching mechanism is composed of a lifting cylinder and a rolling block, has a simple structure, and is easy to control; the state switching can be realized by controlling the extension and retraction of the lifting cylinder by the hydraulic system.

[0009] Furthermore, the length and width of the through slot are greater than the length and width of the rolling block.

[0010] The beneficial effect is that the length and width of the through slot are larger than the size of the rolling block, which can ensure that the rolling block can be smoothly placed in the through slot and can smoothly move up and down relative to the column during the state switching of the gantry frame, avoiding the rolling block from rising and falling with the column, so that it always falls on the gantry working platform under its own weight.

[0011] Furthermore, the lifting cylinder and the rolling block are both installed at the center position of the column width direction of the gantry frame.

[0012] The beneficial effect is that when the gantry frame is jacked up, the jacking force of the jacking cylinder is coaxial with the center of the gantry frame column, thereby ensuring the optimization of the force direction.

[0013] Furthermore, the gantry state switching mechanism is arranged at the front and rear ends of the column.

[0014] The beneficial effect is that the gantry can be guaranteed to be stable when being lifted up.

[0015] Furthermore, a rolling block and a plurality of lifting cylinders are provided in the gantry state switching mechanism, and the plurality of lifting cylinders are arranged along the moving direction of the gantry frame.

[0016] The beneficial effect is that the arrangement of multiple lifting cylinders can provide sufficient force to lift the gantry frame.

[0017] Furthermore, the mobile transmission mechanism includes a motor reducer, a gear and a rack, the motor reducer is fixed to the side of the column, the gear is installed on the output shaft of the motor reducer, the rack is fixed on the gantry working platform, and the gear and the rack are meshed.

[0018] The beneficial effect is that the meshing of the gear and rack can ensure the smooth horizontal movement of the gantry frame and the precise control of the moving distance, and the meshing of the gear and rack also has a self-locking effect, which can avoid accidental sliding of the gantry frame.

[0019] Furthermore, the hydraulic system includes a hydraulically controlled one-way valve, a first throttle valve, a second throttle valve, a three-position four-way electromagnetic reversing valve, a filter, a one-way valve, a motor pump, a relief valve, a proportional relief valve and an oil tank; the oil outlet of the motor pump is connected to the filter through the one-way valve, the oil outlet of the filter is connected to the P port of the three-position four-way electromagnetic reversing valve, the oil inlet of the relief valve and the oil inlet of the proportional relief valve, the oil outlet of the relief valve and the oil outlet of the proportional relief valve are connected to the oil tank. The oil tank is connected to the oil outlet of the first throttle valve, the oil outlet of the hydraulically controlled one-way valve is connected to the rodless chamber of the lifting cylinder, and the oil outlet of the second throttle valve is connected to the rod chamber of the lifting cylinder and the control oil circuit of the hydraulically controlled one-way valve.

[0020] The beneficial effects are: through the design of the hydraulic system, the lifting cylinder can be accurately controlled to ensure the reliability of the lifting cylinder, and it is easy to realize the automatic control of the horizontal movement of the gantry frame.

[0021] Furthermore, a guide locking mechanism is provided between the column and the gantry working platform, and the guide locking mechanism includes a guide nut, a screw rod and a locking nut; two slide grooves are provided on the upper surface of the gantry working platform, and the two slide grooves are located on both sides of the moving track of the rolling block, the guide nut is slidably set in the slide groove, and the guide nut can be supported on the inner side of the notch of the slide groove, the lower end of the screw rod passes through the mounting hole on the bottom surface of the column and is connected to the guide nut, and the locking nut is installed on the upper end of the screw rod, and the length of the screw rod is greater than the height of the gantry frame being lifted.

[0022] The beneficial effects are as follows: the guide locking mechanism can provide guidance for the horizontal movement of the gantry frame through the sliding of the guide nut along the slide groove, and can also enhance the connection reliability between the gantry frame and the gantry frame working platform. In addition, when the gantry frame is lifted up, the screw rod can also provide vertical guidance for the gantry frame.

[0023] Furthermore, the upper surface of the gantry working platform is also provided with a wear-resistant steel plate, and the rollers on the rolling blocks roll on the wear-resistant steel plate.

[0024] The beneficial effect is that the wear-resistant steel plate can prevent the roller of the rolling block from direct contact and friction with the gantry working platform.

[0025] The present invention also proposes a method for horizontal movement of a large-tonnage gantry frame. The method adopts the horizontal movement device described above. First, the hydraulic system controls the cylinder rod of the lifting cylinder to extend and press on the rolling block, and further lifts the gantry frame so that the column is out of contact with the gantry working platform; then, the gantry frame is driven to translate under the rolling support of the rolling block through the mobile transmission mechanism. During the translation process, the hydraulic system maintains the pressure of the lifting cylinder to lock the lifting cylinder; finally, after the translation is in place, the hydraulic system controls the cylinder rod of the lifting cylinder to retract, and the gantry frame gradually falls back until the column is supported on the gantry working platform.

[0026] The beneficial effect is that the method realizes the switching of the gantry frame between the stable support state and the rolling translation state through the cooperation of the gantry frame state switching mechanism and the hydraulic system, so as to meet the rolling friction between the gantry frame and the gantry frame working platform during the translation process, and the gantry frame can be stably supported on the gantry frame working platform during work. It effectively solves the problems of large-tonnage gantry mechanical structures being difficult to move horizontally, easy to scratch the moving platform, and weak supporting capacity of the rolling friction mechanism.

[0027] The beneficial effects of the present invention are as follows: the present invention provides a device and method for converting sliding friction into rolling friction for the horizontal movement of a large-tonnage gantry frame. The device has an ingenious structure, the method is simple to operate, and the degree of automation is high. It effectively solves the problem that the large-tonnage gantry mechanical structure is difficult to move horizontally and easily scratches the moving platform, and the problem that the rolling friction mechanism has weak supporting capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of the gantry frame in the present invention; Figure 2 It is a structural schematic diagram of the horizontal moving device in the present invention; Figure 3 It is the principle diagram of the hydraulic system in the present invention; Figure 4 It is a schematic diagram of the arrangement of the moving transmission mechanism in the gantry-type frame horizontal moving device of the present invention; Markings in the figure: 1. Gantry frame, 1-1. Column, 2. Lifting cylinder, 3. Rolling block, 4. Gantry working platform, 5. Wear-resistant steel plate, 6. Guide nut, 7. Screw, 8. Locking nut, 9. Hydraulic control one-way valve, 10-1. First throttle valve, 10-2. Second throttle valve, 11. Three-position four-way solenoid reversing valve, 12. Filter, 13. One-way valve, 14. Motor pump, 15. Overflow valve, 16. Proportional overflow valve, 17. Oil tank, 18. Pressure sensor, 19. Motor reducer, 20. Gear, 21. Rack, 22. Gantry state switching mechanism, 23. Guide locking mechanism, 24. Slide. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0031] Example 1: Figure 1-4As shown, a horizontal moving device of a large-tonnage gantry frame includes a gantry frame 1, a gantry frame state switching mechanism 22 and a hydraulic system. The gantry frame state switching mechanism 22 is arranged in the installation cavity at the bottom of the column 1-1 of the gantry frame 1, and the gantry frame 1 is switched between a stable support state and a rolling translation state through the cooperation of the gantry frame state switching mechanism 22 and the hydraulic system, so as to meet the rolling friction between the gantry frame 1 and the gantry frame working platform 4 during the translation process, and the gantry frame 1 can be stably supported on the gantry frame working platform 4 during work. The gantry fixed platform 4 plays a guiding role in the translation of the gantry frame 1, and supports and fixes the gantry frame 1 after the translation. The translation of the gantry frame 1 is driven by a mobile transmission mechanism.

[0032] like Figure 2 As shown, the gantry state switching mechanism 22 includes a lifting cylinder 2 and a rolling block 3. The lifting cylinder 2 is arranged at the lower end of the column 1-1 of the gantry frame 1, and the cylinder body of the lifting cylinder 2 is fixed on the column 1-1, and the cylinder rod is vertically extended downward. The rolling block 3 is arranged at the bottom of the column 1-1 and is located below the lifting cylinder 2, and under the action of the deadweight of the rolling block 3, the rolling block 3 naturally falls on the gantry working platform 4. Specifically, a roller mounting groove is arranged on the bottom surface of the rolling block 3, and a row or double rows of rollers are installed in the roller mounting groove. The rollers can rotate freely in the roller mounting groove to ensure that when the gantry frame 1 moves, there is rolling friction between the rolling block 3 and the gantry working platform 4.

[0033] Preferably, a through groove is provided in the installation cavity at the bottom end of the column 1-1 and is located below the lifting cylinder 2. The top and bottom of the through groove are open, and the length and width of the through groove are slightly larger than the length and width of the rolling block 3, so that the rolling block 3 can be smoothly placed in the through groove and can ensure that the rolling block 3 can move up and down smoothly relative to the through groove. For example, the length and width of the through groove are 2 mm larger than the length and width of the rolling block 3.

[0034] Preferably, there is a certain gap between the upper plane of the rolling block 3 and the lifting cylinder 2, for example, a gap of 5 mm. That is, when the cylinder rod of the lifting cylinder 2 is in a fully retracted state, there is a gap between the cylinder rod and the rolling block 3 below, ensuring that when the gantry frame 1 is working, the rolling block 3 in the vertical direction will not be subjected to additional bearing force.

[0035] The gantry frame 1 is in a stable supporting state when working. At this time, the column 1-1 is supported on the gantry work platform 4, and the bottom surface of the column 1-1 is in contact with the upper surface of the gantry work platform 4, with a sufficiently large contact area to ensure the stability of the support of the gantry frame 1. When the gantry frame 1 needs to be moved, the cylinder rod of the jacking cylinder 2 is extended, and the cylinder rod is pressed against the top of the rolling block 3, and then the hydraulic system gradually increases the pressure until the jacking force of the jacking cylinder 2 completely overcomes the weight of the gantry frame 1, and the cylinder rod of the jacking cylinder 2 continues to extend until it is fully extended. At this time, the bottom surface of the column 1-1 of the gantry frame 1 is out of contact with the gantry work platform 4, and the weight of the gantry frame 1 is all on the rolling block 3. At this time, the gantry frame 1 is in a rolling translation state, which can be translated along the gantry work platform 4 under the drive of the mobile transmission mechanism, and the rolling block 3 and the gantry work platform 4 are rolling friction during the translation process.

[0036] The structure of the mobile transmission mechanism is as follows: Figure 4 As shown, it includes a motor reducer 19, a gear 20 and a rack 21. The motor reducer 19 is fixed to the bottom of the gantry frame 1 by screws, the gear 20 is installed on the output shaft of the motor reducer 19, and the rack 21 is fixed to the gantry work platform 4 by screws, and the gear 20 is meshed with the rack 21. The motor reducer 19 drives the gear 20 to rotate along the rack 21, driving the gantry frame 1 to roll and translate on the gantry work platform 4.

[0037] Furthermore, the lifting cylinder 2 and the rolling block 3 are both installed at the center position of the width direction of the column 1-1 of the gantry frame 1, so as to ensure that when the gantry frame 1 is lifted up, the lifting force of the lifting cylinder 2 is coaxial with the center of the column 1-1 of the gantry frame 1, thereby ensuring the optimization of the force direction.

[0038] Further, for the column 1-1 of the gantry frame 1, a gantry state switching mechanism 22 is respectively provided at the front and rear ends of the column 1-1, and the motor reducer 19 and the gear 20 of the mobile transmission mechanism are located between the two gantry state switching mechanisms 22. The jacking cylinder 2 in the gantry state switching mechanism 22 can be set not only as one, but also as multiple, and preferably multiple, and the multiple jacking cylinders 2 are arranged in sequence along the rolling direction of the rolling block 3, that is, arranged along the moving direction of the gantry frame 1. The provision of multiple gantry state switching mechanisms 22 and multiple jacking cylinders 2 can ensure that the jacking cylinder 2 has sufficient jacking force to jack up the gantry frame 1.

[0039] Furthermore, in order to ensure the stability and safety of the gantry frame 1 during the lifting process and the working process, a guide locking mechanism 23 is also provided between the gantry work platform 4 and the column 1-1 of the gantry frame 1. The guide locking mechanism 23 includes a guide nut 6, a screw rod 7 and a locking nut 8. Two slide grooves 24 are provided on the upper surface of the gantry work platform 4. Both slide grooves 24 are T-shaped slide grooves and are distributed on both sides of the rolling block 3. The guide nut 6 is slidably arranged in the slide groove 24, and the guide nut 6 can be pushed against the inner side of the notch of the slide groove 24. The lower end of the screw rod 7 passes through the mounting hole on the bottom surface of the column 1-1 and is connected to the guide nut 6 in the slide groove 24. The upper end of the screw rod 7 is connected to the locking nut 8. The length of the screw rod 7 is greater than the height of the gantry frame 1 being lifted. When the gantry frame 1 needs to be translated, the locking nut 8 is loosened to release the fixed relationship between the gantry frame 1 and the gantry work platform 4, and it is ensured that the distance between the locking nut 8 and the gantry work platform 4 is greater than the height of the gantry frame 1 being lifted. When the translation is completed, or the gantry frame 1 does not need to be translated, the locking nut 8 is tightened to ensure a reliable fixed connection between the gantry frame 1 and the gantry work platform 4.

[0040] Furthermore, the guide nut 6 is a self-made extended T-nut, and a M36 threaded hole is designed in the center of the nut. The length of the nut is 3-5 times that of a standard ordinary T-nut. In this design, the guide nut 6 can not only fix the gantry frame 1, but also has a guiding function to ensure that the gantry frame 1 can move in a straight line along the gantry work platform 4.

[0041] In this embodiment, the gantry work platform 4 is a cast iron platform. In order to reduce the wear between the rolling block 3 and the cast iron platform, a wear-resistant steel plate 5 is fixed on the upper surface of the cast iron platform by screws, and the rolling block 3 rolls on the wear-resistant steel plate 5. By replacing the wear-resistant steel plate 5, the replacement frequency of the gantry work platform 4 can be reduced.

[0042] In this embodiment, the hydraulic system includes a hydraulically controlled one-way valve 9, a first throttle valve 10-1, a second throttle valve 10-2, a three-position four-way electromagnetic reversing valve 11, a filter 12, a one-way valve 13, a motor pump 14, a relief valve 15, a proportional relief valve 16, an oil tank 17, and a pressure sensor 18. Among them, the oil outlet of the motor pump 14 is connected to the filter 12 through the one-way valve 13, the oil outlet of the filter 12 is connected to the P port of the three-position four-way electromagnetic reversing valve 11, the oil inlet of the relief valve 15, and the oil inlet of the proportional relief valve 16, and the oil outlet of the relief valve 15 and the oil outlet of the proportional relief valve 16 are connected to the oil tank 17. The proportional relief valve 16 mainly plays the role of regulating the pressure of the hydraulic system, and a pressure sensor is connected to the proportional relief valve 16. The relief valve 15 mainly plays the role of protecting the components in the hydraulic system to prevent the components from being subjected to pressure exceeding their own pressure resistance. The A port of the three-position four-way electromagnetic reversing valve 11 is connected to the oil inlet of the first throttle valve 10-1, the B port of the three-position four-way electromagnetic reversing valve 11 is connected to the oil inlet of the second throttle valve 10-2, the T port of the three-position four-way electromagnetic reversing valve 11 is connected to the oil tank, the oil outlet of the first throttle valve 10-1 is connected to the oil inlet of the hydraulically controlled one-way valve 9, the oil outlet of the hydraulically controlled one-way valve 9 is connected to the rodless chamber of the jacking cylinder 2, and the oil outlet of the second throttle valve 10-2 is connected to the rod chamber of the jacking cylinder 2 and the control oil circuit of the hydraulically controlled one-way valve 9. The main function of the hydraulically controlled one-way valve 9 is to maintain the pressure of the rodless chamber of the jacking cylinder 2 when the gantry frame 1 moves. The main function of the first throttle valve 10-1 and the second throttle valve 10-2 is to adjust the oil supply flow and oil outlet flow of the jacking cylinder 2, thereby adjusting the extension and retraction speed of the cylinder rod of the jacking cylinder 2.

[0043] The lifting cylinder 2 extends and retracts the cylinder rod under the control of the hydraulic system. (1) When the cylinder rod of the lifting cylinder 2 extends, the lifting cylinder 2 first contacts the rolling block 3, and then the hydraulic system gradually increases the pressure until the lifting force of the lifting cylinder 2 completely overcomes the weight of the gantry frame 1, and the cylinder rod of the lifting cylinder 2 continues to extend until it is fully extended. At this time, the weight of the gantry frame 1 is fully applied to the rolling block 3. (2) When the cylinder rod of the lifting cylinder 2 retracts, the hydraulic system motor pump 14 does not start, and the three-position four-way electromagnetic reversing valve 11 is energized, so that the rodless chamber of the lifting cylinder 2 is connected to the oil tank 17 of the hydraulic system. At this time, the dead weight of the gantry frame 1 will compress the hydraulic oil in the rodless chamber of the lifting cylinder 2 to gradually and slowly flow back to the oil tank 17, so that the gantry frame 1 slowly descends until the gantry frame 1 is completely in contact with the gantry work platform 4. In this process, the bearing capacity of the rolling block 3 gradually decreases until it is 0.

[0044] Example 2 A method for horizontally moving a large-tonnage gantry frame, the method adopts the horizontal moving device described in Example 1. First, under the premise of loosening the locking nut 8, the hydraulic system controls the cylinder rod of the jacking cylinder 2 to extend and press on the rolling block 3, and further lifts the gantry frame 1 to break contact with the gantry work platform 4; then, the motor reducer 19 is started to drive the gear 20 to roll along the rack 21, and then the gantry frame 1 is translated under the rolling support of the rolling block 3. During the translation process, the hydraulic system maintains the pressure of the jacking cylinder 2 and locks the jacking cylinder 2; finally, after the translation is in place, the hydraulic system controls the cylinder rod of the jacking cylinder 2 to retract, and the gantry frame 1 gradually falls back until it contacts with the gantry work platform 4, and the locking nut 8 is tightened.

[0045] The specific steps of the above method are as follows: 1. According to the theoretical weight of the gantry frame 1 G 理 , the number of lifting cylinders 2 N, the diameter of the rodless cavity of the lifting cylinder 2 D 1. Calculate the minimum pressure P required by the hydraulic system according to the following formula, where the theoretical weight G 理 The design weight of the gantry frame 1 can be used; .

[0046] 2. The control system of the hydraulic system automatically adjusts the voltage of the proportional relief valve 16 according to the calculated minimum pressure P, thereby adjusting the pressure provided by the hydraulic system to the jacking cylinder 2.

[0047] Note that the pressure at this time is the theoretically calculated pressure. In actual use, the voltage of the proportional relief valve 16 can be controlled to be slightly larger than the theoretically calculated voltage, that is, the pressure actually adjusted by the proportional relief valve 16 is slightly larger than the calculated minimum pressure P.

[0048] 3. The three-position four-way electromagnetic reversing valve 11 in the hydraulic system is energized to supply oil to the rodless chamber of the jacking cylinder 2, thereby controlling the cylinder rod of the jacking cylinder 2 to slowly extend. When the front section of the cylinder rod contacts the upper plane of the rolling block 3, the pressure of the hydraulic system begins to rise to the pressure adjusted by the proportional relief valve 16. At this time, because the total lifting force of the jacking cylinder 2 is greater than the total weight of the gantry frame 1, the cylinder rod of the jacking cylinder 2 will continue to extend, thereby lifting the gantry frame 1 and making the gantry frame 1 disengaged from the gantry work platform 4. Note that at this time, the locking nut 8 should be in a loose state, and the distance between the locking nut 8 and the gantry work platform 4 should be greater than the height of the gantry frame 1 being lifted.

[0049] 4. After the gantry frame 1 is lifted, the motor reducer 19 starts to rotate, driving the gear 20 to rotate. The gear 20 and the rack 21 mesh with each other, driving the gantry frame 1 to move. At this time, the gantry frame 1 moves with rolling friction, low friction coefficient and small resistance. When moving, the three-position four-way electromagnetic reversing valve 11 is powered off, the hydraulically controlled one-way valve 9 is closed, and the rodless chamber of the lifting cylinder 2 is locked, thereby maintaining the pressure of the lifting cylinder 2.

[0050] 5. After the gantry frame 1 moves into position, the three-position four-way electromagnetic reversing valve 11 is energized to supply oil to the rod chamber of the jacking cylinder 2, the hydraulically controlled one-way valve 9 is opened, and the cylinder rod of the jacking cylinder 2 is retracted. At this time, the cylinder rod of the jacking cylinder 2 is out of contact with the rolling block 3, and the gantry frame 1 gradually falls under the action of gravity as the cylinder rod of the jacking cylinder 2 is retracted until the gantry frame 1 contacts the gantry work platform 4.

[0051] 6. After the gantry frame 1 contacts the gantry working platform 4, tighten the locking nut 8.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Those skilled in the art should understand that the specific implementation modes of the present invention may be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A horizontal moving device for a large-tonnage gantry frame, characterized in that: It includes a gantry state switching mechanism (22), a hydraulic system, a mobile transmission mechanism and a gantry working platform (4); The gantry state switching mechanism (22) is arranged at the bottom of the column (1-1) of the gantry frame (1), and comprises a lifting cylinder (2) and a rolling block (3); the rolling block (3) is movably placed in a through groove at the bottom of the column (1-1) and can fall onto the gantry working platform (4) below under the action of its own weight; the rolling block (3) is a square block, and a roller capable of rolling contact with the gantry working platform (4) is arranged at the bottom thereof, and the roller rotates freely on the rolling block (3); the lifting cylinder (2) is arranged above the rolling block (3); The hydraulic system is used to control the extension and retraction of the lifting cylinder (2); The moving transmission mechanism is arranged between the upright column (1-1) and the gantry working platform (4), and is used to drive the gantry frame (1) to move horizontally on the gantry working platform (4); The gantry frame (1) has a stable support state and a rolling translation state. When the gantry frame (1) is in the stable support state, the bottom surface of the column (1-1) is in contact with the gantry working platform (4), the cylinder rod of the jacking cylinder (2) is retracted, and a gap is left between the cylinder rod and the upper surface of the rolling block (3); when the gantry frame (1) is in the rolling translation state, the bottom surface of the column (1-1) is out of contact with the gantry working platform (4), and the cylinder rod of the jacking cylinder (2) is extended and pressed against the rolling block (3).

2. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The length and width of the through slot are greater than the length and width of the rolling block (3).

3. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The lifting cylinder (2) and the rolling block (3) are both installed at the center position of the column (1-1) of the gantry frame (1) in the width direction.

4. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The gantry state switching mechanism (22) is arranged at the front and rear ends of the column (1-1).

5. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: A rolling block (3) and a plurality of lifting cylinders (2) are provided in the gantry state switching mechanism (22); the plurality of lifting cylinders (2) are arranged along the moving direction of the gantry frame (1).

6. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The mobile transmission mechanism comprises a motor reducer (19), a gear (20) and a rack (21); the motor reducer (19) is fixed to a side surface of the column (1-1); the gear (20) is mounted on an output shaft of the motor reducer (19); the rack (21) is fixed to the gantry working platform (4); and the gear (20) and the rack (21) are meshed.

7. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The hydraulic system comprises a hydraulically controlled one-way valve (9), a first throttle valve (10-1), a second throttle valve (10-2), a three-position four-way electromagnetic reversing valve (11), a filter (12), a one-way valve (13), a motor pump (14), a relief valve (15), a proportional relief valve (16) and an oil tank (17); the oil outlet of the motor pump (14) is connected to the filter (12) via the one-way valve (13); the oil outlet of the filter (12) is connected to the P port of the three-position four-way electromagnetic reversing valve (11), the oil inlet of the relief valve (15) and the oil inlet of the proportional relief valve (16); the oil outlet of the relief valve (15) and the oil inlet of the proportional relief valve (16) are connected to the oil outlet of the relief valve (15) and the oil inlet of the proportional relief valve (16); ) is connected to the oil tank (17), the A port of the three-position four-way electromagnetic reversing valve (11) is connected to the oil inlet of the first throttle valve (10-1), the B port of the three-position four-way electromagnetic reversing valve (11) is connected to the oil inlet of the second throttle valve (10-2), the T port of the three-position four-way electromagnetic reversing valve (11) is connected to the oil tank (17), the oil outlet of the first throttle valve (10-1) is connected to the oil inlet of the hydraulically controlled one-way valve (9), the oil outlet of the hydraulically controlled one-way valve (9) is connected to the rodless chamber of the lifting cylinder (2), and the oil outlet of the second throttle valve (10-2) is connected to the rod chamber of the lifting cylinder (2) and the control oil circuit of the hydraulically controlled one-way valve (9).

8. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: A guide locking mechanism (23) is also provided between the column (1-1) and the gantry working platform (4), and the guide locking mechanism (23) comprises a guide nut (6), a screw rod (7) and a locking nut (8); two slide grooves (24) are provided on the upper surface of the gantry working platform (4), and the two slide grooves (24) are located on both sides of the moving track of the rolling block (3); the guide nut (6) is slidably arranged in the slide groove (24), and the guide nut (6) can be supported on the inner side of the notch of the slide groove (24); the lower end of the screw rod (7) passes through the mounting hole on the bottom surface of the column (1-1) and is connected to the guide nut (6); the locking nut (8) is installed on the upper end of the screw rod (7); the length of the screw rod (7) is greater than the height of the gantry frame (1) being lifted up.

9. The horizontal moving device of the large-tonnage gantry frame according to claim 1 is characterized in that: The upper surface of the gantry working platform (4) is also provided with a wear-resistant steel plate (5), and the roller on the rolling block (3) rolls on the wear-resistant steel plate (5).

10. A method for horizontal movement of a large-tonnage gantry frame, characterized in that: The method adopts the horizontal moving device described in any one of claims 1 to 9. First, the hydraulic system controls the cylinder rod of the lifting cylinder (2) to extend and press against the rolling block (3), and further lifts the gantry frame (1) so that the column (1-1) is out of contact with the gantry working platform (4); then, the gantry frame (1) is driven to translate under the rolling support of the rolling block (3) by the mobile transmission mechanism. During the translation process, the hydraulic system maintains the pressure of the lifting cylinder (2) to lock the lifting cylinder (2); finally, after the translation is in place, the hydraulic system controls the cylinder rod of the lifting cylinder (2) to retract, and the gantry frame (1) gradually falls back until the column (1-1) is supported on the gantry working platform (4).

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