A contact displacement measuring mechanism

Abstract

A contact displacement measuring mechanism. The present invention relates to the technical field of rail vehicle detection. The present invention is to solve the problem of low accuracy of measurement results when detecting the roundness of wheels of existing rail vehicles. The present invention comprises a pressure-bearing component, a displacement sensor, an elastic reset member and a base component. The lower end of the pressure-bearing component is slidably connected with the upper end of the base component in the height direction. An elastic reset member is provided between the pressure-bearing component and the base component. A displacement sensor is vertically arranged on the base component. The top end of the measuring rod of the displacement sensor contacts and cooperates with the lower end of the pressure-bearing component. The present invention is used for displacement measurement.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicle detection, and in particular to a contact type displacement measuring mechanism. Background Art

[0002] When testing the roundness of wheels on existing rail vehicles, the roundness of the tread is indirectly measured by testing the height of the wheel rim. Traditional roundness testing equipment usually uses a long rod to continuously measure the circumference of the wheel rim, which has a slow dynamic response speed and low structural accuracy, so the measurement result is not accurate. In order to improve the measurement accuracy, a contact displacement measurement mechanism is designed. Summary of the invention

[0003] The present invention aims to solve the problem of low measurement accuracy of wheel roundness detection in existing rail vehicles, and further proposes a contact type displacement measurement mechanism.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: the present invention includes a pressure-bearing component, a displacement sensor, an elastic reset component and a base component. The lower end of the pressure-bearing component is slidably connected with the upper end of the base component along the height direction. An elastic reset component is provided between the pressure-bearing component and the base component. A displacement sensor is vertically arranged upward on the base assembly, and the top end of the measuring rod of the displacement sensor contacts and cooperates with the lower end of the pressure-bearing component.

[0005] The beneficial effects of the present invention are:

[0006] The present invention proposes a contact displacement measuring mechanism, which can measure the displacement amount and the displacement information of the tread of the rail vehicle wheel in the height direction, with high measurement accuracy and fast response speed. When performing wheel roundness detection, multiple contact displacement measuring mechanisms can be used in parallel combination to measure the displacement information curve in the height direction when the wheel rolls on the pressure measuring plate for one circle, and the wheel roundness information can be obtained through the displacement information curve, thereby realizing the detection of wheel roundness. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a front cross-sectional view of the overall structure of the present invention;

[0008] Figure 2 It is an axonometric diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0009] Specific implementation method 1: Combination Figure 1 to Figure 2Description: A contact displacement measuring mechanism described in this embodiment includes a pressure-bearing component, a displacement sensor 3, an elastic reset member 6 and a base component. The lower end of the pressure-bearing component is slidably connected to the upper end of the base component along the height direction. An elastic reset member 6 is provided between the pressure-bearing component and the base component. The displacement sensor 3 is vertically arranged on the base assembly, and the top end of the measuring rod 311 of the displacement sensor 3 is in contact with the lower end of the pressure-bearing component.

[0010] Specific implementation method 2: Combination Figure 1 to Figure 2 Description: The pressure-bearing assembly described in this embodiment includes a pressure-bearing measuring plate 1 and a sliding sleeve 2. The pressure-bearing measuring plate 1 is horizontally arranged, and the sliding sleeve 2 is vertically fixed to the middle of the lower end surface of the pressure-bearing measuring plate 1. The base assembly includes a sliding bearing 7 and a bottom plate 9. The sliding bearing 7 is arranged on the upper end surface of the bottom plate 9. The lower end of the sliding sleeve 2 is inserted into the inner hole of the sliding bearing 7, and the outer circumferential side wall of the sliding sleeve 2 is slidably connected with the inner circumferential side wall of the sliding bearing 7 along the height direction. The displacement sensor 3 is arranged in the middle of the upper end surface of the bottom plate 9, and the top end of the measuring rod 311 is in contact with the center of the lower end surface of the pressure-bearing measuring plate 1. The elastic reset member 6 is arranged between the lower end of the sliding sleeve 2 and the upper end surface of the bottom plate 9. Other components and connection methods are the same as those of the first specific embodiment.

[0011] In this embodiment, when the pressure-bearing measuring plate 1 is under pressure, the pressure-bearing measuring plate 1 and the sliding sleeve 2 move downward, and the lower end of the sliding sleeve 2 is inserted into the inner hole of the sliding bearing 7 and moves downward along the inner circumferential side wall of the inner hole of the sliding bearing 7. The pressure-bearing measuring plate 1 presses the measuring rod 311 of the displacement sensor 3 and moves downward. The displacement sensor 3 measures the amount of downward displacement and transmits the output signal to the display panel to obtain the displacement.

[0012] The sliding sleeve 2 presses the upper end of the elastic reset member 6 to move downward, the compression of the elastic reset member 6 increases, and the elastic force increases. During the measurement process, the elastic force of the elastic reset member 6 pushes the pressure measuring plate 1 upward, so that the pressure surface of the upper end face of the pressure measuring plate 1 always maintains close contact with the surface to be measured, thereby ensuring the measurement accuracy.

[0013] When the pressure-bearing measuring plate 1 stops being compressed, the elastic force of the elastic reset member 6 pushes the pressure-bearing measuring plate 1 and the sliding sleeve 2 upward to return to the initial position to prepare for the next measurement.

[0014] When performing wheel roundness detection, multiple contact displacement measuring mechanisms can be used in parallel combination to measure the displacement information curve in the height direction when the wheel rolls one circle on the pressure measuring plate 1. The wheel roundness information can be obtained through the displacement information curve, thereby realizing the wheel roundness detection.

[0015] In this embodiment, the displacement sensor 3 is a linear displacement sensor, and the elastic reset element 6 is a spring.

[0016] Specific implementation method three: Combination Figure 1 to Figure 2 Note that the contact displacement measuring mechanism described in this embodiment further includes a sensor fixing seat 4 and a sensor base 8. The sensor fixing seat 4 is in a "T" shape. The horizontal end of the sensor fixing seat 4 is arranged on the inner side of the sliding sleeve 2, and the outer circumferential side wall of the horizontal end of the sensor fixing seat 4 is slidably connected to the inner circumferential side wall of the sliding sleeve 2. The displacement sensor 3 is installed inside the vertical end of the sensor fixing seat 4. The lower end surface of the vertical end of the sensor fixing seat 4 is connected to the sensor base 8, and the sensor base 8 is fixedly connected to the middle part of the upper end surface of the bottom plate 9. Other components and connection methods are the same as those of the second specific embodiment.

[0017] In this embodiment, the arrangement of the sensor fixing seat 4 and the sensor base 8 can ensure that the displacement sensor 3 is fixed vertically upward. The horizontal end of the sensor fixing seat 4 is arranged on the inner side of the sliding sleeve 2, and the outer circumferential side wall of the horizontal end of the sensor fixing seat 4 is slidably connected with the inner circumferential side wall of the sliding sleeve 2 in a height manner, so that the displacement sensor 3 can maintain a vertical state during the measurement process.

[0018] In this embodiment, the displacement sensor 3 is fixed inside the vertical end of the sensor fixing seat 4 by screws.

[0019] Specific implementation method four: Combination Figure 1 to Figure 2 Note that in this embodiment, a limiting ring 5 is provided between the sensor fixing seat 4 and the sliding sleeve 2, the limiting ring 5 is fixed to the lower end of the inner circumferential side wall of the sliding sleeve 2, the limiting ring 5 is arranged at the lower part of the horizontal end of the sensor fixing seat 4, the vertical end of the sensor fixing seat 4 is inserted in the limiting ring 5, and the outer circumferential side wall of the vertical end of the sensor fixing seat 4 is slidably connected to the inner circumferential side wall of the limiting ring 5. Other components and connection methods are the same as those of the specific embodiment 3.

[0020] In this embodiment, the setting of the limit ring 5 can prevent the sliding sleeve 2 from being pushed out of the sliding bearing 7 due to excessive elastic force or inertia of the elastic reset member 6 when the pressure measuring plate 1 stops being pressurized;

[0021] On the other hand, the pressure measuring plate 1, the sliding sleeve 2, and the limit ring 5 are fixed together, wherein the limit ring 5 is fixed on the inner side of the sliding sleeve 2 by screws; when the pressure measuring plate 1 is under pressure, the pressure measuring plate 1, the sliding sleeve 2, and the limit ring 5 move downward together, at which time the outer circumferential side wall of the lower end of the sliding sleeve 2 is in sliding contact with the inner hole of the sliding bearing 7, and the inner circumferential side wall of the limit ring 5 is in sliding contact with the outer circumferential side wall of the vertical end of the sensor fixing seat 4, ensuring that the pressure measuring plate 1, the sliding sleeve 2, and the limit ring 5 move in the height direction, ensuring the position accuracy, and thus making the measurement more accurate; when the pressure measuring plate 1 stops being under pressure, the elastic force of the elastic reset member 6 pushes the pressure measuring plate 1, the sliding sleeve 2, and the limit ring 5 to move upward until the upper end surface of the limit ring 5 contacts the lower end surface of the horizontal end of the sensor fixing seat 4, ensuring the reset position of the pressure measuring plate 1.

[0022] In this embodiment, the limiting ring 5 is fixed on the sliding sleeve 2 by screws.

[0023] Specific implementation method five: Combination Figure 1 to Figure 2 Note that, in this embodiment, the inner circumferential side wall of the limit ring 5 is provided with a group of inner vertical plane cut surfaces, the outer circumferential side wall of the vertical end of the sensor fixing seat 4 is provided with a group of outer vertical plane cut surfaces, each inner vertical plane cut surface corresponds to an outer vertical plane cut surface, the outer circumferential side wall of the limit ring 5 is provided with a group of outer vertical plane cut surfaces, the inner circumferential side wall of the sliding sleeve 2 is provided with a group of inner vertical plane cut surfaces, each outer vertical plane cut surface corresponds to an inner vertical plane cut surface. Other components and connection methods are the same as those of the fourth embodiment.

[0024] Such a design can prevent relative rotation between the pressure-bearing measuring plate 1 , the sliding sleeve 2 and the displacement sensor 3 .

[0025] Specific implementation method six: Combination Figure 1 to Figure 2 Note that the elastic reset member 6 described in this embodiment is sleeved on the vertical end of the sensor fixing seat 4 and the outer side of the sensor base 8, the lower end of the inner circumferential side wall of the sliding sleeve 2 is provided with a limiting ring groove 211, the limiting ring 5 is arranged above the limiting ring groove 211, and the upper end of the elastic reset member 6 is arranged in the limiting ring groove 211. Other components and connection methods are the same as those of the specific embodiment 5.

[0026] Such design facilitates effective positioning of the upper end of the elastic reset member 6 .

[0027] Specific implementation method seven: Combination Figure 1 to Figure 2 Note that, in this embodiment, a limiting ring 911 is provided on the upper end surface of the bottom plate 9, the bottom of the inner hole of the sliding bearing 7 is sleeved on the outer side of the limiting ring 911, and the lower end of the elastic reset member 6 is arranged on the inner side of the limiting ring 911. Other components and connection methods are the same as those of the second, third, fourth, fifth or sixth embodiments.

[0028] Such a design can realize the positioning of the sliding bearing 7 on the bottom plate 9, and facilitate the effective positioning of the lower end of the elastic reset member 6.

[0029] Specific implementation method eight: Combination Figure 1 to Figure 2 It is explained that the bottom of the sliding bearing 7 described in this embodiment is fixedly connected to the upper end surface of the bottom plate 9, the bottom of the outer circumferential side wall of the sliding bearing 7 is provided with a limiting flange 711 along the circumferential direction, the upper part of the outer circumferential side wall of the sliding bearing 7 is sleeved with a bearing fixing seat 10, the bearing fixing seat 10 is arranged at the upper end of the limiting flange 711, and both sides of the bearing fixing seat 10 extend downward and are fixedly connected to the upper end surface of the bottom plate 9. Other components and connection methods are the same as those of the specific embodiment seven.

[0030] This design is used to achieve effective fixation of the sliding bearing 7 on the base plate 9 .

[0031] In this embodiment, the bottom of the sliding bearing 7 is fixed to the bottom plate 9 by screws, and the bottoms of both sides of the bearing fixing seat 10 are fixed to the bottom plate 9 by screws.

[0032] Specific implementation method nine: Combination Figure 1 to Figure 2 Note that a plug fixing seat 11 is fixedly connected to one side of the bearing fixing seat 10 in this embodiment, a waterproof plug 12 is fixedly connected to the plug fixing seat 11, and a signal output line of the displacement sensor 3 is connected to the waterproof plug 12. Other components and connection methods are the same as those of the eighth embodiment.

[0033] The plug fixing seat 11 designed in this way is fixed on the bearing fixing seat 10 by screws, the waterproof plug 12 is installed on the plug fixing seat, and the signal output line of the displacement sensor 3 is connected to the waterproof plug 12 inside the mechanism, so that the signal output of the displacement sensor 3 is transmitted to the display panel, realizing the transmission and collection of signals.

[0034] In this embodiment, a process groove is provided on the upper end surface of the bottom plate 9 below the waterproof plug 12 , and the process groove is used for positioning the plug fixing seat 11 during installation and avoiding the waterproof plug 12 .

[0035] Specific implementation method ten: Combination Figure 1 to Figure 2 Note that the middle of the lower end surface of the pressure measuring plate 1 in this embodiment is provided with a limiting circular groove 111, and the upper end of the sliding sleeve 2 is fixedly connected in the limiting circular groove 111. Other components and connection methods are the same as those of the second, third, fourth, fifth, sixth, eighth or ninth embodiments.

[0036] Such design is used to achieve the position limiting and fixation of the sliding sleeve 2 on the pressure-bearing measuring plate 1 .

[0037] How it works

[0038] The pressure measuring plate 1, the sliding sleeve 2 and the limit ring 5 are fixed together, wherein the limit ring 5 is fixed on the inner side of the sliding sleeve 2 by screws; when the pressure measuring plate is under pressure, the pressure measuring plate 1, the sliding sleeve 2 and the limit ring 5 move downward together, at which time the outer circumferential side wall of the lower end of the sliding sleeve 2 is in sliding contact with the inner hole of the sliding bearing 7, and the inner circumferential side wall of the limit ring 5 is in sliding contact with the outer circumferential side wall of the vertical end of the sensor fixing seat 4; the pressure measuring plate 1 presses the measuring rod 311 of the displacement sensor 3 and moves downward, the displacement sensor 3 measures the amount of downward displacement, and the output signal is transmitted to the waterproof plug 12.

[0039] The sliding sleeve 2 and the limiting ring 5 press the upper end of the elastic reset member 6 to move downward, the compression amount of the elastic reset member 6 increases, and the elastic force increases;

[0040] When the pressure measuring plate 1 stops being compressed, the elastic force of the elastic reset member 6 pushes the pressure measuring plate 1, the sliding sleeve 2 and the limit ring 5 upward until the upper end surface of the limit ring 5 contacts the lower end surface of the horizontal end of the sensor fixing seat 4.

[0041] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A contact displacement measuring mechanism, characterized in that: The contact type displacement measuring mechanism comprises a pressure bearing assembly, a displacement sensor (3), an elastic reset member (6) and a base assembly, wherein the lower end of the pressure bearing assembly is slidably connected to the upper end of the base assembly along a height direction, an elastic reset member (6) is provided between the pressure bearing assembly and the base assembly, a displacement sensor (3) is vertically arranged on the base assembly, and the top end of a measuring rod (311) of the displacement sensor (3) contacts and cooperates with the lower end of the pressure bearing assembly; The pressure-bearing component comprises a pressure-bearing measuring plate (1) and a sliding sleeve (2), wherein the pressure-bearing measuring plate (1) is arranged horizontally, and the sliding sleeve (2) is vertically fixed to the middle of the lower end surface of the pressure-bearing measuring plate (1); the base component comprises a sliding bearing (7) and a bottom plate (9), wherein the sliding bearing (7) is arranged on the upper end surface of the bottom plate (9), the lower end of the sliding sleeve (2) is inserted into the inner hole of the sliding bearing (7), and the outer circumferential side wall of the sliding sleeve (2) is slidably connected to the inner circumferential side wall of the sliding bearing (7) along the height direction; the displacement sensor (3) is arranged in the middle of the upper end surface of the bottom plate (9), the top end of the measuring rod (311) is in contact with the center of the lower end surface of the pressure-bearing measuring plate (1), and the elastic reset member (6) is arranged between the lower end of the sliding sleeve (2) and the upper end surface of the bottom plate (9).

2. A contact displacement measuring mechanism according to claim 1, characterized in that: The contact type displacement measuring mechanism further comprises a sensor fixing seat (4) and a sensor base (8); the sensor fixing seat (4) is in a T-shape; the horizontal end of the sensor fixing seat (4) is arranged on the inner side of the sliding sleeve (2); the outer circumferential side wall of the horizontal end of the sensor fixing seat (4) is slidably connected to the inner circumferential side wall of the sliding sleeve (2); the displacement sensor (3) is mounted inside the vertical end of the sensor fixing seat (4); the lower end surface of the vertical end of the sensor fixing seat (4) is connected to the sensor base (8); and the sensor base (8) is fixedly connected to the middle part of the upper end surface of the bottom plate (9).

3. A contact displacement measuring mechanism according to claim 2, characterized in that: A limiting ring (5) is provided between the sensor fixing seat (4) and the sliding sleeve (2), the limiting ring (5) being fixedly connected to the lower end of the inner circumferential side wall of the sliding sleeve (2), the limiting ring (5) being arranged at the lower part of the horizontal end of the sensor fixing seat (4), the vertical end of the sensor fixing seat (4) being inserted into the limiting ring (5), and the outer circumferential side wall of the vertical end of the sensor fixing seat (4) being slidably connected to the inner circumferential side wall of the limiting ring (5).

4. A contact displacement measuring mechanism according to claim 3, characterized in that: The inner circumferential side wall of the limiting ring (5) is provided with a group of inner vertical plane cut surfaces, the outer circumferential side wall of the vertical end of the sensor fixing seat (4) is provided with a group of outer wall vertical plane cut surfaces, each inner vertical plane cut surface corresponds to an outer wall vertical plane cut surface, the outer circumferential side wall of the limiting ring (5) is provided with a group of outer vertical plane cut surfaces, the inner circumferential side wall of the sliding sleeve (2) is provided with a group of inner wall vertical plane cut surfaces, each outer vertical plane cut surface corresponds to an inner wall vertical plane cut surface.

5. A contact displacement measuring mechanism according to claim 4, characterized in that: The elastic reset member (6) is sleeved on the vertical end of the sensor fixing seat (4) and the outer side of the sensor base (8); a limiting ring groove (211) is provided at the lower end of the inner circumferential side wall of the sliding sleeve (2); the limiting ring (5) is arranged above the limiting ring groove (211); and the upper end of the elastic reset member (6) is arranged in the limiting ring groove (211).

6. A contact displacement measuring mechanism according to claim 1, 2, 3, 4 or 5, characterized in that: A limiting ring (911) is provided on the upper end surface of the bottom plate (9), the bottom of the inner hole of the sliding bearing (7) is sleeved on the outer side of the limiting ring (911), and the lower end of the elastic reset member (6) is arranged on the inner side of the limiting ring (911).

7. A contact displacement measuring mechanism according to claim 6, characterized in that: The bottom of the sliding bearing (7) is fixedly connected to the upper end surface of the bottom plate (9); a limiting flange (711) is provided at the bottom of the outer circumferential side wall of the sliding bearing (7) along the circumferential direction; a bearing fixing seat (10) is sleeved on the upper part of the outer circumferential side wall of the sliding bearing (7); the bearing fixing seat (10) is arranged at the upper end of the limiting flange (711); and both sides of the bearing fixing seat (10) extend downwardly and are fixedly connected to the upper end surface of the bottom plate (9).

8. A contact displacement measuring mechanism according to claim 7, characterized in that: A plug fixing seat (11) is fixedly connected to one side of the bearing fixing seat (10), a waterproof plug (12) is fixedly connected to the plug fixing seat (11), and a signal output line of the displacement sensor (3) is connected to the waterproof plug (12).

9. A contact type displacement measuring mechanism according to claim 1, 2, 3, 4, 5, 7 or 8, characterized in that: A limiting circular groove (111) is provided in the middle of the lower end surface of the pressure-bearing measuring plate (1), and the upper end of the sliding sleeve (2) is fixedly connected in the limiting circular groove (111).

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