A loading device and loading method for a large-scale precision weak-rigidity turntable

Abstract

A loading device for testing a large-scale precision weak rigidity turntable includes a support frame, a support chassis, a test frame, a central shaft, a bearing, and a loading assembly; the support frame is a portal frame structure, the support chassis is fixed to a ground rail platform or the ground at the center of the support frame, the central shaft is vertically arranged at the center of the support chassis and the test frame, and the bearing is arranged on the outer edge of the upper end of the central shaft; the loading assembly includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope, and a counterweight block. The structure of the present invention is simple, safe and reliable, and has high test accuracy. The counterweight gravity is loaded onto the rotating platform through the pulley group, which is easy to operate and has a lower manufacturing cost than other loading methods; the test turntable drives the test frame to rotate around the central axis, and applies axial force, radial force, and overturning moment in the rotating state, which can simulate the stress state of the test turntable under actual working conditions and provide reliable test data support for actual users of the test turntable.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale rotating device loading experiments, and in particular to a loading device for testing a large-scale precision weak-rigidity turntable and a method for using the same. Background Art

[0002] Some large turntables usually use slewing supports as the rotating body. There are usually two driving modes for turntables, namely worm gear drive and gear drive. There are also usually two rotation modes for turntables, namely inner ring fixed and outer ring rotating and outer ring fixed and inner ring rotating.

[0003] For some high-precision weak-rigidity turntables, high requirements are placed on the accuracy of the slewing support, and high requirements are placed on the processing and assembly accuracy of the products. For applications that require both a large load-bearing capacity and high rotation accuracy of the turntable, in order to verify that the weak-rigidity turntable can output parameters that meet the requirements under more complex stress conditions, it is necessary to conduct actual working condition stress simulation tests on the weak-rigidity turntable. The traditional test method is to use a hydraulic cylinder to load the force based on the angle and position of the loading force. However, for a weak-rigidity turntable, due to the deformation of the turntable itself, the loading force of the hydraulic cylinder is unstable and the test data is unreliable, so this method does not work. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a loading device and method for testing a large precision weak rigidity turntable, which is simple to operate, low in cost, and can reliably simulate the actual stress state of a precision weak rigidity turntable.

[0005] The technical solution adopted in the present invention is:

[0006] A loading device for testing a large precision weak rigidity turntable, comprising a support frame, a support chassis, a test frame, a central shaft, a bearing and a loading assembly;

[0007] The support frame is a portal frame structure, and the support frame is fixed on the ground rail platform or the ground;

[0008] The support chassis is a disc-shaped structure, with fixing holes evenly arranged on the circumference of the support chassis. The support chassis is fixed to the ground rail platform or the ground at the center of the support frame by bolts through the fixing holes. A square mounting hole is provided at the center of the support chassis, and a step ring concentric with the support chassis is provided on the support chassis. Bolt holes for connecting to the inner ring of the turntable to be tested are evenly arranged on the ring surface of the step ring;

[0009] The test frame is a frustum-shaped frame structure, comprising an annular lower base, a circular top cover, and a plurality of connecting plates arranged between the annular lower base and the circular top cover. Bolt holes for connecting to the outer ring of the turntable to be tested are evenly arranged on the annular surface of the annular lower base, a bearing mounting hole is arranged in the center of the circular top cover, and a connecting hole for loading the overturning moment is arranged near the circumferential edge of the circular top cover.

[0010] The central shaft is vertically arranged at the center of the support chassis and the test frame, the lower end of the central shaft is arranged as a square connecting portion that matches the square mounting hole in the center of the support chassis, the bearing is arranged on the outer edge of the upper end of the central shaft, the bearing is located in the bearing mounting hole of the circular top cover, the upper end of the central shaft extends out of the circular top cover of the test frame, and the protruding part is respectively provided with connection holes for loading axial force and radial force;

[0011] The loading assembly includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope and a counterweight; the axial load loading pulley group includes a fixed pulley A, a fixed pulley B and a movable pulley A, the fixed pulley A is arranged at the center position of the top of the support frame, the fixed pulley B is arranged in the middle of the right side of the support frame, one end of the wire rope is connected to the connecting hole at the upper end of the central shaft through a shackle, and then passes through the movable pulley A, the fixed pulley A and the fixed pulley B in sequence, and the other end is connected to the counterweight through a shackle; the overturning moment loading pulley group includes a fixed pulley C and a movable pulley Pull B and fixed pulley C are arranged on the top of the support frame to the right of the fixed pulley A, and the position corresponds to the position of the connecting hole on the circular top cover. One end of the wire rope is connected to the connecting hole on the circular top cover through a shackle, and then passes through the movable pulley B, fixed pulley C and fixed pulley B in sequence, and the other end is connected to the counterweight through a shackle; the radial load loading pulley group includes a fixed pulley D and a movable pulley C. The fixed pulley D is arranged in the middle of the left side of the support frame. One end of the wire rope is connected to the connecting hole at the upper end of the central shaft through a shackle, and then passes through the movable pulley C and fixed pulley D in sequence and is connected to the counterweight through a shackle.

[0012] Specifically, the circular top cover and the connecting plate of the test stand are both provided with reinforcing ribs.

[0013] A method for using a loading device for testing a large precision weak rigidity turntable, comprising the following steps:

[0014] Step 1: First, fix the supporting chassis to the ground rail platform or the ground with bolts and level it; then place the turntable to be tested on the supporting chassis, and fix the inner ring of the turntable to be tested to the step ring of the supporting chassis with bolts;

[0015] Step 2: Insert the square connection part at the lower end of the central shaft into the square mounting hole in the middle of the supporting chassis, and install the bearing on the central shaft; place the test frame on the turntable to be tested, and connect the annular lower base of the test frame to the outer ring of the turntable to be tested with bolts; install the seal and bearing end cover between the bearing and the test frame;

[0016] Step 3: Align the middle of the support frame with the middle of the connected test frame, fix the support frame with bolts, install fixed pulleys A and C on the top of the support frame, and install fixed pulleys B and D on both sides respectively;

[0017] Step 4: Select to perform axial force loading, overturning moment loading or radial force loading test on the test turntable; specifically:

[0018] a: When axial force loading is selected, select a suitable counterweight according to the required loading force of the test. Connect one end of the wire rope to the connection hole at the upper end of the central shaft, and then connect the counterweight through the axial load loading pulley. Drive the outer ring of the test turntable to rotate through the hydraulic motor, and the test frame rotates with the test turntable. Use the detection device to detect the deformation of the test turntable during the test.

[0019] b: When overturning moment loading is selected, select an appropriate counterweight according to the required loading torque of the test. Connect one end of the wire rope to the connection hole on the circular top cover of the test frame, and then connect the counterweight through the overturning moment loading pulley block and fixed pulley B. During the overturning moment loading test, the test turntable and the test frame do not rotate, and the deformation of the test turntable when the overturning moment is loaded is directly detected;

[0020] c: When radial force loading is selected, select an appropriate counterweight according to the required loading force of the test. Connect one end of the wire rope to the connection hole at the upper end of the central shaft, and then connect the counterweight through the radial load loading pulley. Drive the outer ring of the test turntable to rotate through the hydraulic motor, and the test frame rotates with the test turntable. Use the detection device to detect the deformation of the test turntable during the test.

[0021] d: You can choose to perform axial force loading and radial force loading at the same time. Perform axial force loading and radial force loading at the same time according to steps a and b, and use the detection device to detect the deformation of the test turntable during the test.

[0022] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0023] The present invention has a simple structure, is safe and reliable, and has high test accuracy. The counterweight gravity is loaded onto the rotating platform through a pulley set, which is easy to operate and has a low manufacturing cost compared to other loading methods. The test turntable drives the test frame to rotate around the central axis, and applies axial force, radial force and overturning moment in the rotating state, which can simulate the stress state of the test turntable under actual working conditions and provide reliable test data support for actual users of the test turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial cross-sectional schematic diagram of the overall structure of the present invention.

[0025] Figure 2It is a three-dimensional schematic diagram of the present invention.

[0026] Figure 3 Schematic diagram of the support chassis of the present invention.

[0027] Figure 4 It is a schematic diagram of the test stand of the present invention.

[0028] Figure 5 It is a schematic diagram of the central axis of the present invention.

[0029] In the figure: 1-support frame, 2-support chassis, 21-square mounting hole, 22-step ring, 3-test frame, 31-annular lower base, 32-circular top cover, 33-connecting plate, 4-center axis, 5-bearing, 6-loading assembly, 61-fixed pulley A, 62-fixed pulley B, 63-movable pulley A, 64-fixed pulley C, 65-movable pulley B, 66-fixed pulley D, 67-movable pulley C, 68-counterweight, 7-test turntable. DETAILED DESCRIPTION

[0030] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0031] Combined with attachment Figure 1-5 The loading device shown is for testing a large-scale precision weak-rigidity turntable, and includes a support frame 1, a support chassis 2, a test frame 3, a central shaft 4, a bearing 5 and a loading assembly 6.

[0032] The support frame 1 is a portal frame structure, and the support frame 1 is fixed on a ground rail platform or the ground.

[0033] The support chassis 2 is a disc-shaped structure. Fixing holes are evenly arranged on the circumference of the support chassis 2. The support chassis 2 is fixed to the ground rail platform or the ground at the center of the support frame 1 by means of bolts through the fixing holes. A square mounting hole 21 is provided at the center of the support chassis 2. A step ring 22 concentric with the support chassis 2 is provided on the support chassis 2. Bolt holes for connecting to the inner ring of the turntable 7 to be tested are evenly arranged on the annular surface of the step ring 22.

[0034] The test frame 3 is a frustoconical frame structure, including an annular lower base 31, a circular top cover 32 and several connecting plates 33 arranged between the annular lower base 31 and the circular top cover 32. Bolt holes for connecting to the outer ring of the turntable 7 to be tested are evenly arranged on the annular surface of the annular lower base 31, a bearing 5 mounting hole is set in the center of the circular top cover 32, and a connecting hole for loading overturning torque is set near the circumferential edge of the circular top cover 32; reinforcing ribs are provided on the circular top cover 32 and the connecting plates 33.

[0035] The central shaft 4 is vertically arranged at the center of the supporting chassis 2 and the test frame 3. The lower end of the central shaft 4 is arranged as a square connecting portion that matches the central square mounting hole 21 of the supporting chassis 2. The bearing 5 is arranged on the outer edge of the upper end of the central shaft 4. The bearing 5 is located in the bearing 5 mounting hole of the circular top cover 32. The upper end of the central shaft 4 extends out of the circular top cover 32 of the test frame 3, and the protruding part is respectively provided with connection holes for loading axial force and radial force.

[0036] The loading assembly 6 includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope and a counterweight 68; the axial load loading pulley group includes a fixed pulley A61, a fixed pulley B62 and a movable pulley A63, the fixed pulley A61 is set at the top center position of the support frame 1, and the fixed pulley B62 is set at the middle of the right side of the support frame 1. One end of the wire rope is connected to the connecting hole at the upper end of the central shaft 4 through a shackle, and then passes through the movable pulley A63, the fixed pulley A61 and the fixed pulley B62 in sequence, and the other end is connected to the counterweight 68 through a shackle; the overturning moment loading pulley group includes a fixed pulley C64 and a movable pulley B65. The fixed pulley C64 is arranged at the top of the support frame 1 on the right side of the fixed pulley A61, and its position corresponds to the position of the connecting hole on the circular top cover 32. One end of the wire rope is connected to the connecting hole on the circular top cover 32 through a shackle, and then passes through the movable pulley B65, the fixed pulley C64 and the fixed pulley B62 in sequence, and the other end is connected to the counterweight 68 through a shackle; the radial load loading pulley group includes a fixed pulley D66 and a movable pulley C67. The fixed pulley D66 is arranged in the middle of the left side of the support frame 1. One end of the wire rope is connected to the connecting hole at the upper end of the central shaft 4 through a shackle, and then passes through the movable pulley C67 and the fixed pulley D66 in sequence and is connected to the counterweight 68 through a shackle.

[0037] A method for using a loading device for testing a large precision weak rigidity turntable, comprising the following steps:

[0038] Step 1: First, fix the supporting chassis 2 to the ground rail platform or the ground with bolts and level it; place the turntable 7 to be tested on the supporting chassis 2, and fix the inner ring of the turntable 7 to be tested to the step ring 22 of the supporting chassis 2 with bolts;

[0039] Step 2: Insert the square connection portion at the lower end of the central shaft 4 into the square mounting hole 21 in the middle of the supporting chassis 2, and install the bearing 5 on the central shaft 4; place the test frame 3 on the turntable 7 to be tested, and connect the annular lower base 31 of the test frame 3 to the outer ring of the turntable 7 to be tested with bolts; install the seal between the bearing 5 and the test frame 3 and the end cover of the bearing 5;

[0040] Step 3: Align the middle of the support frame 1 with the middle of the connected test frame 3, fix the support frame 1 with bolts, install fixed pulleys A61 and C64 on the top of the support frame 1, and install fixed pulleys B62 and D66 on both sides respectively;

[0041] Step 4: Select to perform axial force loading, overturning moment loading or radial force loading test on the test turntable 7; specifically:

[0042] a: When axial force loading is selected, a suitable counterweight 68 is selected according to the required loading force of the test. One end of the wire rope is connected to the connection hole at the upper end of the central shaft 4, and then connected to the counterweight 68 through the axial load loading pulley. The outer ring of the test turntable 7 is driven to rotate by the hydraulic motor, and the test frame 3 rotates with the test turntable 7. The deformation of the test turntable 7 during the test is detected by the detection device;

[0043] b: When overturning moment loading is selected, a suitable counterweight 68 is selected according to the required loading torque of the test. One end of the wire rope is connected to the connection hole on the circular top cover 32 of the test frame 3, and then connected to the counterweight 68 through the overturning moment loading pulley block and the fixed pulley B62. During the overturning moment loading test, the test turntable 7 and the test frame 3 do not rotate, and the deformation of the test turntable 7 when the overturning moment is loaded is directly detected;

[0044] c: When radial force loading is selected, a suitable counterweight 68 is selected according to the required loading force of the test. One end of the wire rope is connected to the connection hole at the upper end of the central shaft 4, and then connected to the counterweight 68 through the radial load loading pulley. The outer ring of the test turntable 7 is driven to rotate by the hydraulic motor, and the test frame 3 rotates with the test turntable 7. The deformation of the test turntable 7 during the test is detected by the detection device;

[0045] d: Axial force loading and radial force loading can be performed simultaneously. Axial force loading and radial force loading are performed simultaneously in the manner of steps a and b, and the deformation of the test turntable 7 during the test is detected by a detection device.

[0046] The detection device adopts an inclination sensor and a displacement sensor.

[0047] The parts not described in detail in this invention are prior art.

[0048] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A loading device for testing a large precision weak rigidity turntable, characterized in that: Includes support frame, support chassis, test frame, center shaft, bearings and loading components; The support frame is a portal frame structure, and the support frame is fixed on the ground rail platform or the ground; The support chassis is a disc-shaped structure, with fixing holes evenly arranged on the circumference of the support chassis. The support chassis is fixed to the ground rail platform or the ground at the center of the support frame by bolts through the fixing holes. A square mounting hole is provided at the center of the support chassis, and a step ring concentric with the support chassis is provided on the support chassis. Bolt holes for connecting to the inner ring of the turntable to be tested are evenly arranged on the ring surface of the step ring; The test frame is a frustum-shaped frame structure, comprising an annular lower base, a circular top cover, and a plurality of connecting plates arranged between the annular lower base and the circular top cover. Bolt holes for connecting to the outer ring of the turntable to be tested are evenly arranged on the annular surface of the annular lower base, a bearing mounting hole is arranged in the center of the circular top cover, and a connecting hole for loading the overturning moment is arranged near the circumferential edge of the circular top cover. The central shaft is vertically arranged at the center of the support chassis and the test frame, the lower end of the central shaft is arranged as a square connecting portion that matches the square mounting hole in the center of the support chassis, the bearing is arranged on the outer edge of the upper end of the central shaft, the bearing is located in the bearing mounting hole of the circular top cover, the upper end of the central shaft extends out of the circular top cover of the test frame, and the protruding part is respectively provided with connection holes for loading axial torque and radial torque; The loading assembly includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope and a counterweight; the axial load loading pulley group includes a fixed pulley A, a fixed pulley B and a movable pulley A, the fixed pulley A is arranged at the center position of the top of the support frame, the fixed pulley B is arranged in the middle of the right side of the support frame, one end of the wire rope is connected to the connecting hole at the upper end of the central shaft through a shackle, and then passes through the movable pulley A, the fixed pulley A and the fixed pulley B in sequence, and the other end is connected to the counterweight through a shackle; the overturning moment loading pulley group includes a fixed pulley C and a movable pulley Pull B and fixed pulley C are arranged on the top of the support frame to the right of the fixed pulley A, and the position corresponds to the position of the connecting hole on the circular top cover. One end of the wire rope is connected to the connecting hole on the circular top cover through a shackle, and then passes through the movable pulley B, fixed pulley C and fixed pulley B in sequence, and the other end is connected to the counterweight through a shackle; the radial load loading pulley group includes a fixed pulley D and a movable pulley C. The fixed pulley D is arranged in the middle of the left side of the support frame. One end of the wire rope is connected to the connecting hole at the upper end of the central shaft through a shackle, and then passes through the movable pulley C and fixed pulley D in sequence and is connected to the counterweight through a shackle.

2. The large-scale precision weak rigidity turntable testing loading device according to claim 1 is characterized in that: The circular top cover and the connecting plate of the test frame are both provided with reinforcing ribs.

3. A method for using the large-scale precision weak rigidity turntable testing loading device according to any one of claims 1-2, comprising the following steps: Step 1: First, fix the supporting chassis to the ground rail platform or the ground with bolts and level it; then place the turntable to be tested on the supporting chassis, and fix the inner ring of the turntable to be tested to the step ring of the supporting chassis with bolts; Step 2: Insert the square connection part at the lower end of the central shaft into the square mounting hole in the middle of the supporting chassis, and install the bearing on the central shaft; place the test frame on the turntable to be tested, and connect the annular lower base of the test frame to the outer ring of the turntable to be tested with bolts; install the seal and bearing end cover between the bearing and the test frame; Step 3: Align the middle of the support frame with the middle of the connected test frame, fix the support frame with bolts, install fixed pulleys A and C on the top of the support frame, and install fixed pulleys B and D on both sides respectively; Step 4: Select to perform axial force loading, overturning moment loading or radial force loading test on the test turntable; specifically: a: When axial force loading is selected, select a suitable counterweight according to the required loading force of the test. Connect one end of the wire rope to the connection hole at the upper end of the central shaft, and then connect the counterweight through the axial load loading pulley. Drive the outer ring of the test turntable to rotate through the hydraulic motor, and the test frame rotates with the test turntable. Use the detection device to detect the deformation of the test turntable during the test. b: When overturning moment loading is selected, select an appropriate counterweight according to the required loading torque of the test. Connect one end of the wire rope to the connection hole on the circular top cover of the test frame, and then connect the counterweight through the overturning moment loading pulley block and fixed pulley B. During the overturning moment loading test, the test turntable and the test frame do not rotate, and the deformation of the test turntable when the overturning moment is loaded is directly detected; c: When radial force loading is selected, select an appropriate counterweight according to the required loading force of the test. Connect one end of the wire rope to the connection hole at the upper end of the central shaft, and then connect the counterweight through the radial load loading pulley. Drive the outer ring of the test turntable to rotate through the hydraulic motor, and the test frame rotates with the test turntable. Use the detection device to detect the deformation of the test turntable during the test. d: You can choose to perform axial force loading and radial force loading at the same time. Perform axial force loading and radial force loading at the same time according to steps a and b, and use the detection device to detect the deformation of the test turntable during the test.

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