An electric motor lifting system based on box beam static load test system

Abstract

The invention provides a motor lifting system based on a box beam static load test system, comprising: a counterweight steel ingot, a pressure sensor, an automatic screw jack, a gasket group, a reaction frame, a winding observation instrument, a lower support steel frame and a control system; the automatic screw jack comprises: a top plate, a sawtooth screw, a sleeve, a jack main frame, a copper nut, a worm shaft, a lifting handle, a ratchet mechanism, a copper worm wheel, a thrust ball bearing, a radial ball bearing, a chassis, a driving connecting rod and a servo electric cylinder; the control system is electrically connected to the automatic screw jack, the pressure sensor and the winding observation instrument respectively, and the control system is used to control a group of automatic screw jacks to act synchronously; the invention has the advantages that: the reaction frame is supported by the automatic screw jack instead of the hydraulic jack, so that the requirements for recording the static load test force of the dedicated railway ballastless track simply supported box beam can be met, and the invention has the advantages of low cost, simple use, stable and reliable performance, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and in particular relates to a motor lifting system based on a box beam static load test system. Background Art

[0002] The bridges used in the railway laying process need to be tested by static load experiments with simply supported box girders. The actual load-bearing capacity of the bridge can be seen from the working conditions and dynamic performance of the experiment. The data obtained through static load experiments and theoretical analysis can be used to make a comprehensive analysis of the laid bridge and derive the load level of the bridge. A jack is required in this static load experiment. However, when the hydraulic jack is used to load the track, the main disadvantages are that it requires a hydraulic pump station, which is large in size and weight, inconvenient, and the oil pipe needs to be longer. The overall configuration of the jack used in bridge inspection is too heavy. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide an electric motor lifting system based on a box girder static load test system, which is used to replace the hydraulic jack to carry out static load tests on simply supported box girders of ballastless tracks of dedicated railways, so as to overcome the deficiencies of the above-mentioned prior art.

[0004] The electric motor lifting system based on the box beam static load test system provided by the present invention comprises: a counterweight steel ingot, a pressure sensor, an automatic screw jack, a gasket group, a reaction frame, a winding observation instrument, a lower support steel frame and a control system;

[0005] Wherein, the counterweight steel ingot is installed at the center of the top of the reaction frame, the two ends of the reaction frame are located on the top end surface of the lower support steel frame, a group of automatic screw jacks are installed between the reaction frame and the lower support steel frame, the bottom of the automatic screw jack is installed on the lower support steel frame, and its top is supported on the bottom of the reaction frame, the pressure sensor is installed at the position where the automatic screw jack contacts the reaction frame, the gasket group is installed at the connection between the bottom of the automatic screw jack and the lower support steel frame, and the winding observation instrument is installed at the position close to the bottom of the lower support steel frame;

[0006] The automatic screw jack includes: a top plate, a serrated screw, a sleeve, a jack main frame, a copper nut, a worm shaft, a lifting handle, a ratchet mechanism, a copper worm wheel, a thrust ball bearing, a radial ball bearing, a chassis, a driving connecting rod and a servo electric cylinder; the top plate is installed at the top position of the serrated screw, the jack main frame fixes the sleeve to the chassis in the vertical direction, the copper nut is fixed to the inner wall of the sleeve, the serrated screw is threadedly connected to the inside of the copper nut, the length of the copper nut is consistent with the spiral height of the serrated screw, the copper worm wheel thread is sleeved on the serrated screw, and a The thrust ball bearing is installed in the mounting groove on the chassis, the copper worm wheel is installed on the thrust ball bearing through a buffer gasket, the radial ball bearing is sleeved on the bottom of the sawtooth screw and installed on the chassis, the ratchet mechanism is installed on one side of the jack main frame, the worm shaft is installed on the ratchet of the ratchet mechanism, the ratchet mechanism drives the copper worm wheel through the worm shaft, and the copper worm wheel drives the sawtooth screw to reciprocate up and down in the copper nut, the lifting handle is installed on the jack main frame and is located on the same side of the ratchet mechanism, and the servo electric cylinder is connected to the lifting handle through a driving connecting rod and drives the ratchet mechanism;

[0007] The control system is electrically connected to the automatic screw jack, the pressure sensor and the winding observation instrument respectively, and the control system is used to control a group of automatic screw jacks to act synchronously.

[0008] Preferably, a group of automatic screw jacks is five automatic screw jacks, and the five automatic screw jacks are evenly installed on the lower supporting steel frame, and the five automatic screw jacks are used to synchronously lift the reaction frame.

[0009] Preferably, a set of thrust ball bearings consists of two thrust ball bearings, which are symmetrically arranged on both sides of the sawtooth screw, and the buffer gasket is a rubber gasket, which is installed between the thrust ball bearing and the copper worm gear.

[0010] Preferably, the sawtooth screw has an unequally spherical trapezoidal sawtooth thread.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. The electric motor lifting system of the present invention makes up for the shortcomings of hydraulic jacks, such as large size, inconvenient use, sensitivity to temperature changes, high manufacturing precision requirements, complex processes, and inability to ensure the smoothness and correctness of movement. The present application uses an automatic screw jack to replace the hydraulic jack to support the reaction frame, which can meet the requirements of static load test recording force for the simply supported box girder of the ballastless track of the dedicated railway line, and has the advantages of low cost, simple use, stable and reliable performance, etc.

[0013] 2. The automatic screw jack of the present invention utilizes a lever (servo electric cylinder) to drive the screw jack to achieve the purpose of applying an external force load. Multiple groups of servo electric cylinders can be synchronously controlled through a control system, resulting in a better lifting effect and ensuring a more accurate experiment.

[0014] 3. The transmission of the screw jack of the present invention is completed by the cooperation of the screw and the nut to form a threaded pair. It converts the rotational motion of the nut into the linear motion of the screw. The threaded pair has the advantages of stable and reliable motion, compact and convenient structure, and convenient self-locking.

[0015] 4. The root strength of the trapezoidal thread of the serrated screw of the present invention is higher than that of other threads, and the trapezoidal thread has better processability than other threads.

[0016] 5. The turbine and worm of the present invention together form a screw drive. The turbine and worm transfer power between the staggered axes of motion to ensure a more stable transmission.

[0017] 6. The copper nut of the present invention adopts a full-stroke long nut, which can ensure that the serrated screw is more stable during the rising process and help the serrated screw to better withstand pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the automatic screw jack of the present invention.

[0021] The accompanying drawings are marked as follows: counterweight steel ingot 1, pressure sensor 2, automatic screw jack 3, top plate 301, serrated screw 302, sleeve 303, jack main frame 304, copper nut 305, worm shaft 306, lifting handle 307, ratchet mechanism 308, copper worm wheel 309, thrust ball bearing 310, radial ball bearing 311, chassis 312, drive connecting rod 313, servo electric cylinder 314, buffer gasket 315, gasket group 4, reaction frame 5, winding observation instrument 6, lower support steel frame 7. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution and advantages of the present invention, the present application is described in detail below in conjunction with the accompanying drawings, but it is not intended to limit the protection scope of the present invention.

[0023] See also Figure 1 to Figure 2 As shown: the electric motor lifting system based on the box beam static load test system in this embodiment includes: a counterweight steel ingot 1, a pressure sensor 2, an automatic screw jack 3, a gasket group 4, a reaction frame 5, a winding observation instrument 6, a lower support steel frame 7 and a control system.

[0024] The counterweight steel ingot 1 in this embodiment is installed at the center of the top of the reaction frame 5, and the two ends of the reaction frame 5 are located on the top end surface of the lower support steel frame 7. A group of five automatic screw jacks 3 are installed between the reaction frame 5 and the lower support steel frame 7. The bottom of the automatic screw jack 3 is installed on the lower support steel frame 7, and its top is supported at the bottom of the reaction frame 5. The pressure sensor 2 is installed at the position where the top plate of the automatic screw jack 3 contacts the reaction frame 5, the gasket group 4 is installed at the connection between the bottom plate of the automatic screw jack 3 and the lower support steel frame 7, and the winding observation instrument 6 is installed near the bottom of the lower support steel frame 7.

[0025] The automatic screw jack 3 in this embodiment includes: a top plate 301, a sawtooth screw 302, a sleeve 303, a jack main frame 304, a copper nut 305, a worm shaft 306, a lifting handle 307, a ratchet mechanism 308, a copper worm wheel 309, a thrust ball bearing 310, a radial ball bearing 311, a chassis 312, a driving connecting rod 313 and a servo electric cylinder 314; the top plate 301 is installed at the top position of the sawtooth screw 302, the jack main frame 304 fixes the sleeve 303 to the chassis 312 in the vertical direction, the copper nut 305 is fixed to the inner wall of the sleeve 303, the sawtooth screw 302 is threadedly connected to the inside of the copper nut 305, the length of the copper nut 305 is consistent with the spiral height of the sawtooth screw 302, and the copper worm wheel 309 is threadedly sleeved on the sawtooth screw 302. A group of two thrust ball bearings 310 are installed in the mounting groove on the chassis 312, the copper worm wheel 309 is installed on the thrust ball bearing 310 through the buffer gasket 315, the radial ball bearing 311 is sleeved on the bottom of the serrated screw 302 and installed on the chassis 312, the ratchet mechanism 308 is installed on one side of the jack main frame 304, the worm shaft 306 is installed on the ratchet of the ratchet mechanism 308, the ratchet mechanism 308 drives the copper worm wheel 309 through the worm shaft 306, the copper worm wheel 309 drives the serrated screw 302 to reciprocate up and down in the copper nut 305, the lifting handle 307 is installed on the jack main frame 304 and is located on the same side of the ratchet mechanism 308, and the servo electric cylinder 314 is connected to the lifting handle 307 through the driving connecting rod 313 and drives the ratchet mechanism 308.

[0026] The control system (general purpose processor) in this embodiment is respectively connected to the automatic screw jack 3, the pressure sensor 2 and the winding observation instrument 6, and the control system is used to control a group of automatic screw jacks 3 to act synchronously.

[0027] A group of automatic screw jacks 3 in this embodiment includes five automatic screw jacks 3 , and the five automatic screw jacks 3 are evenly installed on the lower supporting steel frame 7 , and the five automatic screw jacks 3 are used to synchronously lift the reaction frame 5 .

[0028] In this embodiment, there are two thrust ball bearings 310 symmetrically arranged on both sides of the sawtooth screw 302 . The buffer gasket 315 is a rubber gasket installed between the thrust ball bearing 310 and the copper worm gear 309 .

[0029] Preferably, the sawtooth screw 302 is an isosceles trapezoidal sawtooth thread.

[0030] Working principle: The static load test of the railway ballastless track simply supported box girder is carried out by driving the reaction frame 5 with the winding observation instrument 6 through five automatic screw jacks 3. The automatic screw jack 3 mainly drives the lifting handle 307 reciprocatingly through the servo electric cylinder 314 by driving the connecting rod 313, and then drives the ratchet mechanism 308 through the lifting handle 307, and the ratchet mechanism 308 drives the worm shaft 306 and the copper worm wheel 309, thereby realizing the lifting and lowering of the serrated screw 302.

[0031] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electric motor lifting system based on a box beam static load test system, characterized in that: include: Counterweight steel ingot, pressure sensor, automatic screw jack, gasket set, reaction frame, winding observation instrument, lower support steel frame and control system; Wherein, the counterweight steel ingot is installed at the center of the top of the reaction frame, the two ends of the reaction frame are located on the top end surface of the lower support steel frame, a group of automatic screw jacks are installed between the reaction frame and the lower support steel frame, the bottom of the automatic screw jack is installed on the lower support steel frame, and its top is supported on the bottom of the reaction frame, the pressure sensor is installed at the position where the automatic screw jack contacts the reaction frame, the gasket group is installed at the connection between the bottom of the automatic screw jack and the lower support steel frame, and the winding observation instrument is installed at a position close to the bottom of the lower support steel frame; The automatic screw jack includes: a top plate, a serrated screw, a sleeve, a jack main frame, a copper nut, a worm shaft, a lifting handle, a ratchet mechanism, a copper worm wheel, a thrust ball bearing, a radial ball bearing, a chassis, a driving connecting rod and a servo electric cylinder; the top plate is installed at the top position of the serrated screw, the jack main frame fixes the sleeve to the chassis in the vertical direction, the copper nut is fixed to the inner wall of the sleeve, the serrated screw is threadedly connected to the inside of the copper nut, the length of the copper nut is consistent with the spiral height of the serrated screw, the copper worm wheel is threadedly sleeved on the serrated screw, and a set of The thrust ball bearing is installed in a mounting groove on the chassis, the copper worm wheel is installed on the thrust ball bearing through a buffer gasket, the radial ball bearing is sleeved on the bottom of the sawtooth screw and installed on the chassis, the ratchet mechanism is installed on one side of the jack main frame, the worm shaft is installed on the ratchet of the ratchet mechanism, the ratchet mechanism drives the copper worm wheel through the worm shaft, the copper worm wheel drives the sawtooth screw to reciprocate up and down in the copper nut, the lifting handle is installed on the jack main frame and is located on the same side of the ratchet mechanism, and the servo electric cylinder is connected to the lifting handle through a driving connecting rod and drives the ratchet mechanism; Wherein, the control system is electrically connected to the automatic screw jack, the pressure sensor and the winding observation instrument respectively, and the control system is used to control a group of the automatic screw jacks to act synchronously; The group of automatic screw jacks is five automatic screw jacks, the five automatic screw jacks are evenly installed on the lower support steel frame, and the five automatic screw jacks are used to synchronously lift the reaction frame; A group of thrust ball bearings consists of two, which are symmetrically arranged on both sides of the sawtooth screw. The buffer gasket is a rubber gasket installed between the thrust ball bearing and the copper worm gear.

2. The electric motor lifting system based on the box beam static load test system according to claim 1 is characterized in that: The sawtooth screw rod adopts an unequally spherical trapezoidal sawtooth thread.

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