Dynamic load test device and test method

Abstract

The present invention relates to a dynamic load test device. The present invention comprises a lower bearing assembly, an intermediate bearing body, an upper bearing assembly, a pull rod, and a track plate. The lower bearing assembly is arranged with a passively rotating rotating wheel, the upper bearing assembly is provided with a downward pressing loading cylinder, the intermediate bearing body supports and connects the lower bearing assembly and the upper bearing assembly, the pull rod connects the lower bearing assembly, the intermediate bearing body, and the upper bearing assembly, the upper bearing assembly is above the lower bearing assembly and a space cavity for accommodating a heavy-load drive device is provided between the two, the track plate is placed on the rotating wheel, and the track plate has a space cavity for free entry and exit. The present invention can obtain the following technical effects: the test device occupies a small area, can carry out high-load loading tests, the loading force is steplessly adjustable, the test device has a strong load-bearing capacity, can simulate the real heavy-load working condition adjustment, and the test function is powerful and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of load test equipment, in particular to a dynamic load test device. Background Art

[0002] In modern industrial production, there are displacement drives for large-load components, and a heavy-duty drive device with high torque and compactness is often used for load-carrying displacement. For example, a heavy-duty drive device disclosed in CN112777537A generally requires high technology and high safety requirements, and needs to be tested for loads. However, simply performing a static load test is often not enough, and the use of theory and numerical calculations to evaluate the dynamic load performance of the load-carrying device is far from enough. Therefore, it is necessary to perform a dynamic load test on the heavy-duty drive device to explore the change law of the load-carrying device under different loads, different driving speeds, and different road surfaces or track surface flatness through experiments. However, due to the constraints of the heavy-duty drive device on the load amount and the test environment, ordinary laboratories are currently unable to carry out heavy load or overweight load testing in a small space. Therefore, a dynamic load test device is needed to solve the above problems. Summary of the invention

[0003] In order to solve the problem of dynamic load test of a heavy-load drive device under limited environmental conditions, the present invention invents a dynamic load test device.

[0004] The present invention adopts the following technical solutions:

[0005] The dynamic load testing device includes a lower bearing assembly, an intermediate bearing body, an upper bearing assembly, a pull rod, and a track plate. The lower bearing assembly is arranged with a passively rotating wheel, the upper bearing assembly is provided with a downward pressing loading cylinder, the intermediate bearing body supports and connects the lower bearing assembly and the upper bearing assembly, the pull rod connects the lower bearing assembly, the intermediate bearing body, and the upper bearing assembly, the upper bearing assembly is above the lower bearing assembly and a space cavity for accommodating a heavy-load drive device is provided between the two, the track plate is placed on the wheel, and the track plate has a space cavity for free entry and exit.

[0006] The lower bearing assembly includes: an axle, a long frame, a bearing, and a short frame plate. The two long frames are arranged in parallel, and the front and rear ends of the two long frames are fixedly connected by short frame plates respectively. Multiple groups of rotating wheels parallel to the short frame plates are arranged between the two long frames. The rotating wheels specifically include: the two long frames are respectively provided with symmetrical and coaxial shaft holes, and the axles are adapted to be installed in the symmetrical shaft holes. A middle platform with an outer circular protrusion is arranged in the middle of the wheel axle, and bearings are respectively arranged on both sides of the middle platform. The two bearings are symmetrically arranged, and a limit sleeve is arranged on the wheel axle sleeve between the inner ring of the bearing and the inner side of the long frame. The two long frames are symmetrically provided with pull rod holes that pass through from top to bottom.

[0007] The upper bearing assembly includes: side beams, square tubes, inner beams, and a bottom plate. Two side beams are arranged side by side on the outside, and two inner beams are arranged side by side inside the two side beams. The two side beams and the two inner beams are arranged in parallel and a certain distance is reserved. Square tubes are welded and arranged at intervals around the side beams and the inner beams. A bottom plate is arranged at the bottom of the above-mentioned welded assembly. The bottom plate is provided with a through hole, and the through hole is located in the middle of the interval between the two side beams and the two inner beams. The loading cylinder flange with the rod end facing downward is connected to the through hole. The side beams and the inner beams are provided with pull rod holes that pass through from top to bottom at the ends. The pull rod holes provided on the side beams and the inner beams, the middle bearing body, the long frame, and the upper, middle and lower parts are matched and connected, and pull rods are provided in the distributed pull rod holes. Threads are provided at the upper and lower ends of the pull rods and are locked with nuts.

[0008] A guide wheel group is arranged on the ground in the inlet and outlet directions of the space cavity. The guide wheel group comprises a wheel frame and a roller shaft. A plurality of roller shafts with the same rolling direction are arranged on the wheel frame. The moving direction of the roller shaft of the guide wheel group is consistent with the inlet and outlet directions of the space cavity.

[0009] The intermediate carrier includes an intermediate carrier 1 and an intermediate carrier 2. The intermediate carrier 1 and the intermediate carrier 2 are matched with the length and width of the long frame respectively. The intermediate carrier 1 and the intermediate carrier 2 are respectively arranged on the long frame. The side walls of the intermediate carrier 1 and the intermediate carrier 2 are respectively provided with through holes. The through hole of the intermediate carrier 1 3 is coaxial with the through hole of the intermediate carrier 2 4.

[0010] The center of the through hole is close to the axis of the load wheel of the tested heavy-load driving device, and the aperture of the through hole on the side wall of the intermediate carrier is larger than the axis diameter of the load wheel of the tested device.

[0011] The side beams and inner beams are forged from steel.

[0012] The middle carrier is formed by hexagonal butt welding of thin plates.

[0013] The upper bearing assembly is provided with a plurality of loading cylinders, and the plurality of loading cylinders are aligned with the rotating wheels arranged in an arranged manner up and down.

[0014] The test method of the dynamic load test device comprises the following steps:

[0015] Step 1: The heavy-load drive device to be tested is placed on the track plate and guided by the guide wheel group into the space cavity between the lower bearing component and the upper bearing component. The gravity of the track plate acts on the rotating wheel of the lower bearing component. The axis of the load-bearing wheel of the heavy-load drive device to be tested corresponds to the through hole of the side wall of the middle bearing body, and has the condition for observation from the outside to the inside.

[0016] Step 2: The loading cylinder is loaded, and the piston rod is extended downward. The loading force acts on the heavy-load drive device, and the gravity of the heavy-load drive device acts on the track plate.

[0017] Step three, the heavy-load drive device works, the load-carrying wheel of the tested heavy-load drive device rotates, and friction is generated with the track plate, the rotating wheel of the lower load-bearing assembly rotates passively, the loading force of the loading cylinder increases or decreases according to the test requirements, and the driving torque and wheel speed of the tested heavy-load drive device increase or decrease according to the test requirements. According to the test requirements, the load-carrying wheel axle of the tested heavy-load drive device is observed through the through hole in the side wall of the middle load-bearing body. A connecting shaft can be added in the through hole in the side wall of the middle load-bearing body to connect the load-carrying wheel axle of the heavy-load drive device to prevent it from forward and backward displacement.

[0018] In step four, the load wheel of the tested heavy-load drive device rotates, generating friction with the track plate, and the rotating wheel of the lower load-bearing component rotates passively. The track plate between the two is guided out from the guide wheel group at the inlet of the space cavity to the guide wheel group at the outlet of the space cavity. Multiple track plates are successively introduced into the tested space cavity front and back to keep the tested heavy-load drive device in its original loading position.

[0019] Compared with the prior art, the present invention can achieve the following technical effects: the test device occupies a small area, can carry out high-load loading tests, the loading force is steplessly adjustable, the test device has a strong load-bearing capacity, the speed test range is wide, the track plate roughness can be set to simulate real heavy-load working conditions, the test function is powerful and stable, and a variety of sensors can be supported.

[0020] The present invention realizes efficient, safe and stable testing of heavy-load drive devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0022] Figure 2 It is a half-section schematic diagram of the present invention in a forward direction;

[0023] Figure 3 yes Figure 2 AA section diagram;

[0024] Figure 4 It is a working schematic diagram of the present invention.

[0025] Among them, 1-support, 2-lower bearing assembly, 3-intermediate bearing body one, 4-intermediate bearing body two, 5-upper bearing assembly, 6-pull rod, 7-guide wheel group, 8-heavy-load drive device, 9-track plate, 201-wheel axle, 202-long frame, 203-bearing, 204-sleeve wheel, 205-outer wheel cover, 206-inner wheel cover, 207-axle baffle, 208-short frame plate, 501-side beam, 502-square tube, 503-inner beam, 504-loading cylinder, 505-lifting ear, 506-bottom plate, 504-1-flange, 504-2-cylinder, 504-3-piston rod, 504-4-guide sleeve. DETAILED DESCRIPTION

[0026] like Figure 1-4As shown, the dynamic load test device includes a support 1, a lower bearing assembly 2, an intermediate bearing body, an upper bearing assembly 5, a pull rod 6, and a guide wheel group 7, wherein the lower bearing assembly 2 includes: an axle 201, a long frame 202, a bearing 203, a sleeve wheel 204, an outer wheel cover 205, an inner wheel cover 206, an axle baffle 207, and a short frame plate 208. The two long frames 202 are arranged in parallel, and the front and rear ends of the two long frames 202 are respectively fixedly connected by short frame plates 208. A plurality of groups of rotating wheels parallel to the short frame plates 208 are arranged between the two long frames 202. The rotating wheels specifically include: the two long frames 202 are respectively provided with symmetrical and coaxial shaft holes, and the axles 201 are adapted to be installed in the symmetrical shaft holes, and the axle baffle 207 is arranged outside the axle 201 and connected to the long frames. A middle platform with a raised outer circle is set in the middle of the wheel axle 201, and bearings 203 are respectively set on both sides of the middle platform. The two bearings 203 are symmetrically arranged, and the outer circle clearance of the two bearings 203 is matched to set symmetrical sleeve wheels 204. The two sleeve wheels 204 are respectively connected with outer wheel covers 205 and inner wheel covers 206 by screws on both sides. The wheel axle 201 between the inner ring of the bearing 203 and the inner side of the long frame 202 is sleeved with a limit sleeve, and the two long frames 202 are symmetrically provided with pull rod holes that pass through from top to bottom. The bottom of the lower bearing component 2 is distributed with a support 1, and the upper bearing component 5 includes: side beams 501, square tubes 502, inner beams 503, loading cylinders 504, lifting ears 505, and bottom plates 506. Two side beams are arranged in parallel on the outside, and two inner beams are arranged in parallel inside the two side beams. The two side beams and the two The inner beams are arranged in parallel and a certain distance is reserved. Square tubes 502 are welded at intervals around the side beams and the inner beams. A bottom plate 506 is arranged at the bottom of the welded assembly. The bottom plate 506 is provided with a through hole. The through hole is located in the middle of the interval between the two side beams and the two inner beams. The ends of the side beams and the inner beams are provided with pull rod holes that pass through from top to bottom. The intermediate bearing body includes an intermediate bearing body 1 3 and an intermediate bearing body 2 4. The length and width of the lower bearing assembly 2 match those of the upper bearing assembly 5. The long frame 202 of the lower bearing assembly 2 is respectively provided with an intermediate bearing body 1 3 and an intermediate bearing body 2 4. The intermediate bearing body 1 3 and the intermediate bearing body 2 4 match the length and width of the long frame 202 respectively. The intermediate bearing body 1 3 and the intermediate bearing body 2 4 have a certain height. The intermediate bearing body 1 3 and the intermediate bearing body 2 4 have a certain height. , an upper bearing assembly 5 is provided on the middle bearing body 2 4, and a pull rod hole penetrating from top to bottom is provided on the middle bearing body 1 3 and the middle bearing body 2 4 respectively. The pull rod holes provided on the side beam and the inner beam, the middle bearing body, the long frame 202, and the upper, middle and lower parts are matched and penetrated, and a pull rod 6 is provided in the distributed pull rod holes. Threads are provided at the upper and lower ends of the pull rod 6 and nuts are used to lock them, so that the lower bearing assembly 2, the middle bearing body and the upper bearing assembly 5 are integrated to form a space cavity for accommodating the heavy-load drive device to enter. A guide wheel group 7 is provided on the ground in the inlet and outlet directions of the space cavity. The guide wheel group 7 includes a wheel frame and a roller shaft. A plurality of roller shafts with the same rolling direction are provided on the wheel frame. The roller shaft of the guide wheel group 7 has the same moving direction as the inlet and outlet directions of the space cavity.The loading cylinder 504 includes a flange 504-1, a cylinder barrel 504-2, a piston rod 504-3 with a piston and a rod integrated, and a guide sleeve 504-4. The flange 504-1 is provided at the mouth of the cylinder barrel 504-2, the piston rod 504-3 is installed in the cylinder barrel 504-2, and the guide sleeve 504-4 is screwed on the cylinder barrel for guidance. The outer circle of the cylinder barrel of the loading cylinder 504 passes through the through hole of the bottom plate 506, the piston rod 504-3 faces downward, and the flange 504-1 is connected and fixed to the bottom plate 506.

[0027] Preferably, the side beams and the inner beams are forged from steel and have relatively high strength.

[0028] Preferably, the intermediate carrier is formed by six-sided butt welding of thin plates, which has a certain mechanical tensile strength and also has a weight reduction effect. Figure 3 .

[0029] Further preferably, the side walls of the intermediate carrier 1 3 and the intermediate carrier 2 4 are respectively provided with through holes, and the through hole of the intermediate carrier 1 3 is coaxial with the through hole of the intermediate carrier 2 4 .

[0030] Preferably, the center of the through hole in the side wall of the intermediate carrier is close to the axis of the load wheel of the tested heavy-load driving device, and the aperture of the through hole in the side wall of the intermediate carrier is larger than the axis diameter of the load wheel of the tested device.

[0031] The working method is:

[0032] Step 1, such as Figure 4 The heavy-load drive device under test is placed on the track plate 9 and is guided by the guide wheel group 7 into the space cavity between the lower bearing component 2 and the upper bearing component 5. The gravity of the track plate 9 acts on the rotating wheel of the lower bearing component 2. The axis of the load wheel of the heavy-load drive device under test corresponds to the through hole of the side wall of the intermediate bearing body, and has the condition of observation from the outside to the inside.

[0033] Step 2, such as Figure 1-4 The loading cylinder 504 is loaded, and the piston rod 504 - 3 is extended downward. The loading force acts on the heavy-load drive device, and the gravity of the heavy-load drive device acts on the track plate 9.

[0034] Step three, such as Figure 1-4 The heavy-load drive device works, the load wheel of the tested heavy-load drive device rotates, generating friction with the track plate 9, the rotating wheel of the lower bearing assembly 2 rotates passively, the loading force of the loading cylinder 504 increases or decreases according to the test requirements, and the driving torque and wheel speed of the tested heavy-load drive device increase or decrease according to the test requirements.

[0035] Step 4: Figure 1-4The load wheel of the tested heavy-load drive device rotates, generating friction with the track plate 9, and the rotating wheel of the lower bearing assembly 2 rotates passively. The track plate 9 between the two is led out from the guide wheel group at the inlet of the space cavity to the guide wheel group at the outlet of the space cavity. Multiple track plates are successively introduced into the tested space cavity, so that the tested heavy-load drive device maintains the original loading position.

[0036] The upper surface of the track plate 9 in contact with the load wheels of the heavy-duty drive device can be set to different roughnesses according to the working conditions to meet the test requirements.

[0037] In step three, according to the test requirements, the load-carrying wheel axle of the tested heavy-duty driving device can be observed from the through hole in the side wall of the intermediate carrier body. A connecting shaft can also be added in the through hole in the side wall of the intermediate carrier body to connect the load-carrying wheel axle of the heavy-duty driving device to prevent it from forward and backward displacement.

[0038] The side wall of the middle carrier can be attached and clamped with various types of sensors, such as vibration, photoelectric, rotation speed, pressure, etc., to conduct very convenient testing of the device under test.

Claims

1. Dynamic load test device, characterized in that: The invention comprises a lower bearing assembly (2), an intermediate bearing body, an upper bearing assembly (5), a pull rod (6), and a track plate (9); the lower bearing assembly (2) is provided with passively rotating wheels arranged in an array; the upper bearing assembly (5) is provided with a downward pressing loading cylinder (504); the intermediate bearing body supports and connects the lower bearing assembly (2) and the upper bearing assembly (5); the pull rod (6) connects the lower bearing assembly (2), the intermediate bearing body, and the upper bearing assembly (5); the upper bearing assembly (5) is provided with a space cavity for accommodating a heavy-load drive device to be tested above the lower bearing assembly (2) and between the two; the track plate (9) is placed on the wheel; the track plate (9) can freely enter and exit the space cavity; The lower bearing assembly (2) comprises: a wheel axle (201), a long frame (202), a bearing (203), and a short frame plate (208). The two long frames (202) are arranged in parallel. The front and rear ends of the two long frames (202) are respectively fixedly connected by the short frame plate (208). A plurality of groups of passively rotating wheels parallel to the short frame plate (208) are arranged between the two long frames (202). The wheels specifically comprise: the two long frames (202) are respectively provided with symmetrical and coaxial shaft holes, the wheel axles (201) are adapted to be installed in the symmetrical shaft holes, a middle platform with an outer circular protrusion is arranged in the middle of the wheel axle (201), and bearings (203) are respectively arranged on both sides of the middle platform. The two bearings are symmetrically arranged, and a limiting sleeve is arranged between the inner ring of the bearing (203) and the inner side of the long frame (202) and the wheel axle (201) is sleeved with a limiting sleeve. The two long frames (202) are symmetrically provided with pull rod holes that pass through from top to bottom. The upper bearing assembly (5) comprises: a side beam, a square tube (502), an inner beam, and a bottom plate (506). Two side beams are arranged in parallel on the outside, and two inner beams are arranged in parallel inside the two side beams. The two side beams and the two inner beams are arranged in parallel and a certain distance is reserved. The square tubes (502) are welded and arranged at intervals around the side beams and the inner beams. A bottom plate (506) is arranged at the bottom of the welded assembly consisting of the two side beams, the two inner beams, and the square tubes (502). The bottom plate (506) is provided with a through hole, and the through hole is located in the middle of the interval between the two side beams and the two inner beams. A loading cylinder (504) with a rod end facing downward is flange-connected in the through hole. The end portions of the side beams and the inner beams are provided with pull rod holes that penetrate up and down. The pull rod holes provided on the side beams, the inner beams, the middle bearing body, the long frame (202), and the upper, middle, and lower parts are matched and penetrated. Pull rods (6) are arranged in the distributed pull rod holes. The pull rods (6) are provided with threads at both ends and are locked with nuts.

2. The dynamic load test device according to claim 1, characterized in that: A guide wheel group (7) is arranged on the ground at the inlet and outlet sides of the space cavity, the guide wheel group (7) comprising a wheel frame and a roller shaft, a plurality of roller shafts with the same rolling direction are arranged on the wheel frame, and the travel direction of the roller shafts of the guide wheel group (7) is consistent with the extension direction of the inlet and outlet of the space cavity.

3. The dynamic load test device according to claim 2, characterized in that: The intermediate carrier comprises an intermediate carrier 1 (3) and an intermediate carrier 2 (4); the intermediate carrier 1 (3) and the intermediate carrier 2 (4) are respectively matched with the length and width of the long frame (202); the intermediate carrier 1 (3) and the intermediate carrier 2 (4) are respectively arranged on the long frame (202); the side walls of the intermediate carrier 1 (3) and the intermediate carrier 2 (4) are respectively provided with through holes; the through hole of the intermediate carrier 1 (3) is coaxial with the through hole of the intermediate carrier 2 (4).

4. The dynamic load test device according to claim 3, characterized in that: The center of the through hole is close to the axis of the load wheel of the tested heavy-load drive device, and the aperture of the through hole on the side wall of the intermediate carrier is larger than the axis diameter of the load wheel of the tested heavy-load drive device.

5. The dynamic load test device according to claim 4, characterized in that: The side beams and inner beams are forged from steel.

6. The dynamic load test device according to claim 4, characterized in that: The upper bearing assembly (5) is provided with a plurality of loading cylinders (504), and the plurality of loading cylinders (504) are aligned with the rotating wheels arranged in an arranged manner up and down.

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