Step roller fatigue testing machine

Abstract

The utility model discloses a step roller fatigue testing machine. The step roller fatigue testing machine comprises a contact wheel, a first connector, a guide supporting device, a pressure sensor, a second connector, a force loading device and a rotation driving device, the output end of the rotation driving device is provided with a to-be-tested step roller, and a contact wheel is installed beside the output end of the rotation driving device. The contact wheel is rotatably installed on the first connector, the first connector is connected to one side of the pressure sensor, the pressure sensor is not supported by the guide supporting device, the second connector is installed on the other side of the pressure sensor, and the first connector and the second connector are both supported by the guide supporting device. The guide supporting device guides the first connector and the second connector to move in the radial direction of the output end of the rotary driving device. The step roller fatigue testing machine solves the problem that an extension arm and a roller are inclined downwards after long-term use due to the fact that the extension arm and the roller which are connected through a screw of a force loading device in the prior art are not supported.

Description

Technical Field

[0001] The utility model relates to the field of step roller testing, in particular to a step roller fatigue testing machine. Background Art

[0002] Step rollers are the core components of escalators. Their primary function is to drive the steps smoothly along the guide rails through rolling friction. The guide rails also constrain the steps' motion path, ensuring smooth and safe operation. Therefore, the wear resistance of step rollers is crucial for escalators. This application discusses how to test the wear resistance of step rollers.

[0003] A Chinese patent discloses an escalator step roller test device with application number CN201420316333.0. The escalator step roller test device includes a frame with a mounting panel installed on the frame, a drive pulley installed in front of the mounting panel, and a drive device installed behind the mounting panel. The drive device is connected to the drive pulley through a transmission shaft and drives the drive pulley to perform circular motion. A plurality of groups of roller fixing seats arranged in a radial direction are evenly distributed on the circumference with the drive pulley as the center in front of the mounting panel. Each group of roller fixing seats is provided with a clamping device to fix the roller to one end of the radial line near the center of the circle. The clamping device and the roller can move as a whole relative to the roller fixing seat in a direction perpendicular to the mounting panel. Each group of roller fixing seats is provided with a force loading device to drive the roller to move radially along the drive pulley.

[0004] Although the step roller testing device of the escalator can realize the wear resistance test of the step roller, the step roller testing device of the escalator still has the following disadvantages: since the extension arm and the roller are suspended in the air without support in the prior art, the connection between the screw and the pressure sensor bears a large load, which makes the connection between the screw and the pressure sensor easy to deform. After deformation, the extension arm cannot maintain a position parallel to the horizontal plane, and the end of the extension arm where the roller is installed is tilted downward, causing the pressure sensor to bear the weight of the extension arm and the step roller, resulting in inaccurate pressure sensor detection results. Utility Model Content

[0005] The utility model provides a step roller fatigue testing machine, which solves the problem in the prior art that the extension arm and the roller connected by the screw of the force loading device have no support, resulting in the extension arm and the roller tilting downward after long-term use.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a step roller fatigue testing machine comprising: a contact wheel, a first connecting head, a guide support device, a pressure sensor, a second connecting head, a force loading device and a rotary drive device; the step roller to be tested is installed at the output end of the rotary drive device, the contact wheel is installed next to the output end of the rotary drive device, and the contact wheel contacts the step roller to be tested; the contact wheel is rotatably installed on the first connecting head, the first connecting head is connected to one side of the pressure sensor, the pressure sensor is not supported by the guide support device, and the second connecting head is installed on the other side of the pressure sensor, the first connecting head and the second connecting head are both supported by the guide support device, and the guide support device guides the first connecting head and the second connecting head to move radially at the output end of the rotary drive device; a force loading device is installed next to the second connecting head, the output end of the force loading device acts on the second connecting head, and the force loading device is used to pull the contact wheel, the first connecting head, the pressure sensor and the second connecting head to move.

[0008] Preferably, a fixed support seat is provided beside the force loading device, the fixed support seat fixes the housing of the force loading device, and the output end of the force loading device is hinged to the second connector.

[0009] Preferably, a first hinge hole is provided at the output end of the force loading device, and a second hinge hole is provided at the second connecting head. The angle between the axis of the second hinge hole and the moving direction of the second connecting head on the guide support device is 85°-95°. The first hinge hole and the second hinge hole are both passed through by the hinge shaft, and the diameter of the first hinge hole is larger than the diameter of the hinge shaft.

[0010] Preferably, both ends of the hinge shaft are threadedly connected with anti-drop caps, and the two anti-drop caps clamp the second connector.

[0011] Preferably, the rotary drive device includes: a rotary motor, a rotary disk, a rotary shaft and a nut, the output end of the rotary motor is fixed with a rotary disk, the rotary disk is fixed with a rotary shaft, the axis line of the rotary shaft and the axis line of the rotary motor are in a straight line, the output end of the rotary shaft is threadedly connected with a nut, the rotary shaft passes through the step roller to be detected, the rotary shaft is threadedly connected with a nut, and the nut presses the step roller to be detected onto the rotary disk.

[0012] Preferably, a guide shaft is fixed on the second connecting head, the guide shaft passes through the contact wheel, a nut is threadedly connected to the guide shaft, and the nut presses the contact wheel tightly on the second connecting head.

[0013] Preferably, the contact wheel, the first connector, the guide support device, the pressure sensor, the second connector, the force loading device, the rotating disk, the rotating shaft and the nut are all installed on the top surface of the test box, and the rotating motor is installed in the test box.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The idea in the prior art is that after the force loading device is installed in the test box, the contact wheel, the contact wheel mounting location and the pressure sensor are directly suspended, and the output end of the force loading device is made of metal materials, etc., then after long-term use, there is a disadvantage that the contact wheel falls down, that is, the extension arm of the prior art is tilted downward, and the extension arm and the contact wheel are not in a horizontal direction. Moreover, the end of the extension arm where the contact wheel is mounted is relatively low, and the pressure sensor detects not only the pushing force, but also the gravity of the contact wheel and the extension arm, which will affect the test results and cause inaccurate test results. The idea of ​​this application is to break the traditional idea of ​​first fixing the force loading device, and it is necessary to first support and guide the first connector and the second connector, and then install the force loading device; then, as long as the output end of the force loading device can pull the second connector, the pressure sensor and the first connector, it is not necessary to strictly keep the pushing force direction of the force loading device and the moving direction of the second connector in a straight line. The first connector must be supported and guided because the first connector and the contact wheel cannot be left suspended in the air, preventing the first connector from being subjected to the weight of the contact wheel for a long period of time and causing downward tilt and deformation. This prevents the pressure sensor from being subjected to the weight of the first connector and the contact wheel due to downward tilt and deformation of the first connector, thereby improving the detection accuracy of the pressure sensor. The second connector must be supported and guided because the second connector needs to receive the pushing force of the force-applying device. If the pushing force of the force-applying device is not strictly horizontal, the force applied to the second connector also has a vertical component. Therefore, the first and second connectors must be supported and guided to prevent the vertical component from causing the second connector and the pressure sensor to break. Furthermore, because the movement of the second connector is strictly guided by the guide support device, the second connector only experiences force in the direction of the guide support device relative to the pressure sensor, and does not transmit the vertical component of the force applied by the force-applying device to the pressure sensor, further improving the detection accuracy of the pressure sensor. Because the second connector is strictly supported and guided by the guide support device, subsequent installation of the force-applying device is less difficult because the driving direction of the force-applying device does not need to be strictly horizontal; slight deviations are acceptable.

[0016] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the step roller fatigue testing machine.

[0018] Figure 2 It is a structural diagram of the contact wheel, the first connecting head, the guide support device, the pressure sensor, the second connecting head, and the force loading device.

[0019] Figure numerals: contact wheel 1, first connecting head 2, guide shaft 21, nut 22, guide support device 3, pressure sensor 4, second connecting head 5, articulated shaft 51, protective cap 52, force loading device 6, rotation drive device 7, rotating disk 71, rotating shaft 72, nut 73, test box 8, step roller to be tested 9, fixed support seat 10. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and functions achieved by the present invention easier to understand, the present invention is further explained below with reference to the accompanying drawings and specific implementation methods.

[0021] like Figure 1 as well as Figure 2 As shown, the utility model discloses a step roller fatigue testing machine comprising: a contact wheel 1, a first connecting head 2, a guide support device 3, a pressure sensor 4, a second connecting head 5, a force loading device 6 and a rotary drive device 7; the output end of the rotary drive device 7 is installed with a step roller 9 to be tested, and the contact wheel 1 is installed next to the output end of the rotary drive device 7, and the contact wheel 1 is in contact with the step roller 9 to be tested; the contact wheel 1 is rotatably installed on the first connecting head 2, the first connecting head 2 is connected to one side of the pressure sensor 4, the pressure sensor 4 is not supported by the guide support device 3 (that is, the pressure sensor 4 is suspended), and the second connecting head 5 is installed on the other side of the pressure sensor 4, the first connecting head 2 and the second connecting head 5 are both supported by the guide support device 3, and the guide support device 3 guides the first connecting head 2 and the second connecting head 5 to move in the radial direction of the output end of the rotary drive device 7; a force loading device 6 is installed next to the second connecting head 5, and the output end of the force loading device 6 acts on the second connecting head 5, and the force loading device 6 is used to pull the contact wheel 1, the first connecting head 2, the pressure sensor 4 and the second connecting head 5 to move. The force loading device 6 can be a cylinder, a hydraulic rod, or other linear drive devices.

[0022] In this embodiment, the guiding support device 3 is a guide rail, which not only guides the movement of the first connector 2 and the second connector 5, but also supports the first connector 2 and the second connector 5. The same group of first connectors 2 and second connectors 5 are on the same guide rail, so that the first connector 2 and the second connector 5 can move very accurately in one direction.

[0023] In this embodiment, a fixed support base 10 is provided next to the force loading device 6. The fixed support base 10 fixes the housing of the force loading device 6. The output end of the force loading device 6 is hinged to the second connector 5. The fixed support base 10 realizes the installation and fixing of the housing of the force loading device 6.

[0024] In the present application, a first hinge hole is formed at the output end of the force-loading device 6, and a second hinge hole is formed at the second connector 5. The angle between the axis of the second hinge hole and the direction of movement of the second connector 5 on the guide support device 3 is 85°-95°. The first hinge hole and the second hinge hole are both passed through by a hinge shaft 51, and the diameter of the first hinge hole is larger than the diameter of the hinge shaft 51. Since the second connector 5 is supported by the guide support device 3, the guide support device 3 can support the vertical component of the force applied by the force-loading device 6. The second connector 5 has a tendency to move relative to the pressure sensor 4 only in the direction guided by the guide support device 3, thereby allowing the force applied by the force-loading device 6 to be not strictly in the horizontal direction. Based on this reason (allowing the force-loading device 6 to apply force not strictly in the horizontal direction), the present application designs a first hinge hole with a diameter larger than that of the hinge shaft 51 at the output end of the force-loading device 6. The hinge shaft 51 needs to pass through the second hinge hole before passing through the first hinge hole. However, due to the installation accuracy of the housing of the force-loading device 6, the axis of the first hinge hole and the axis of the second hinge hole cannot be strictly aligned. Therefore, the diameter of the first hinge hole is designed to be larger than the diameter of the hinge shaft 51, so that the hinge shaft 51 can pass through the first hinge hole and the second hinge hole. Since the force-loading device 6 is allowed to apply force not strictly in the horizontal direction, the installation requirements for the force-applying device are reduced, and the installation difficulty is also reduced.

[0025] In the present application, both ends of the hinge shaft 51 are threadedly connected with anti-drop caps, and the two anti-drop caps clamp the second connector 5. The anti-drop caps prevent the hinge shaft 51 from being detached from the second connector 5.

[0026] Preferably, the rotary drive device 7 includes: a rotary motor (not shown), a rotary disk 71, a rotary shaft 72, and a nut 73. The output end of the rotary motor is fixed with the rotary disk 71, the rotary disk 71 is fixed with the rotary shaft 72, the axis of the rotary shaft 72 is aligned with the axis of the rotary motor, the output end of the rotary shaft 72 is threadedly connected with the nut 73, the rotary shaft 72 passes through the step roller to be tested, the rotary shaft 72 is threadedly connected with the nut 73, and the nut 73 presses the step roller to be tested against the rotary disk 71. The rotary disk 71 supports the bottom surface of the step roller to be tested to prevent the bottom surface of the step roller to be tested from being damaged by friction supported by the top surface of the test box 8.

[0027] In this application, a guide shaft 21 is fixed to the second connector 5, and the guide shaft 21 passes through the contact wheel 1. A nut 22 is threadedly connected to the guide shaft 21, and the nut 22 presses the contact wheel 1 onto the second connector 5, thereby achieving rotatable mounting of the contact wheel 1.

[0028] The contact wheel 1 , the first connector 2 , the guide support device 3 , the pressure sensor 4 , the second connector 5 , the force loading device 6 , the rotating disk 71 , the rotating shaft 72 and the nut 73 are all installed on the top surface of the test box 8 , and the rotating motor is installed inside the test box 8 .

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Step roller fatigue testing machine, characterized in that, include: A contact wheel (1), a first connecting head (2), a guide support device (3), a pressure sensor (4), a second connecting head (5), a force loading device (6), and a rotation drive device (7); The output end of the rotary drive device (7) is installed with a step roller (9) to be tested, and a contact wheel (1) is installed next to the output end of the rotary drive device (7), and the contact wheel (1) contacts the step roller (9) to be tested; The contact wheel (1) is rotatably mounted on a first connector (2). The first connector (2) is connected to one side of a pressure sensor (4). The pressure sensor (4) is not supported by a guide support device (3). A second connector (5) is mounted on the other side of the pressure sensor (4). Both the first connector (2) and the second connector (5) are supported by the guide support device (3). The guide support device (3) guides the first connector (2) and the second connector (5) to move radially at the output end of the rotary drive device (7). A force loading device (6) is installed next to the second connecting head (5), and the output end of the force loading device (6) acts on the second connecting head (5). The force loading device (6) is used to pull the contact wheel (1), the first connecting head (2), the pressure sensor (4) and the second connecting head (5) to move.

2. The step roller fatigue testing machine according to claim 1, characterized in that: A fixed support seat (10) is provided beside the force loading device (6), the fixed support seat (10) fixes the housing of the force loading device (6), and the output end of the force loading device (6) is hinged to the second connector (5).

3. The step roller fatigue testing machine according to claim 2, characterized in that: The output end of the force loading device (6) is provided with a first hinge hole, and the second connector (5) is provided with a second hinge hole. The angle between the axis of the second hinge hole and the moving direction of the second connector (5) on the guide support device (3) is 85°-95°. The hinge shaft (51) passes through both the first hinge hole and the second hinge hole. The diameter of the first hinge hole is larger than the diameter of the hinge shaft (51).

4. The step roller fatigue testing machine according to claim 3, characterized in that: Both ends of the hinge shaft (51) are threadedly connected with anti-drop caps, and the two anti-drop caps clamp the second connector (5).

5. The step roller fatigue testing machine according to any one of claims 1 to 4, characterized in that: The rotary drive device (7) comprises a rotary motor, a rotary disk (71), a rotary shaft (72) and a nut (73). The rotary disk (71) is fixed to the output end of the rotary motor. The rotary disk (71) is fixed to the rotary shaft (72). The axis of the rotary shaft (72) and the axis of the rotary motor are on a straight line. The output end of the rotary shaft (72) is threadedly connected to the nut (73). The rotary shaft (72) passes through the step roller to be detected. The nut (73) is threadedly connected to the rotary shaft (72). The nut (73) presses the step roller to be detected onto the rotary disk (71).

6. The step roller fatigue testing machine according to claim 5, characterized in that: A guide shaft (21) is fixed on the second connector (5), the guide shaft (21) passes through the contact wheel (1), a nut (22) is threadedly connected on the guide shaft (21), and the nut (22) presses the contact wheel (1) onto the second connector (5).

7. The step roller fatigue testing machine according to claim 6, characterized in that: The contact wheel (1), the first connector (2), the guide support device (3), the pressure sensor (4), the second connector (5), the force loading device (6), the rotating disk (71), the rotating shaft (72) and the nut (73) are all installed on the top surface of the test box (8), and the rotating motor is installed in the test box (8).

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