Composite material front fork fatigue test heating device

Abstract

The utility model discloses a composite material front fork fatigue test heating device, which comprises a heating device main body, and the right end of the heating device main body is connected with a composite material front fork main body. The device is used for heating the brake seat to a specified temperature so as to consider whether the composite material front fork is obviously degraded under the influence of brake heat, and is used for solving the technical problems that in the prior art, when an existing front fork fatigue testing machine is used for carrying out a composite material disc brake front fork brake seat fatigue test, the brake seat is difficult to heat, and the brake seat is difficult to deform. Therefore, whether the composite material front fork is obviously degraded under the influence of brake heat is difficult to consider. By arranging the single-head electric heating tube, the power of the single-head electric heating tube ensures that the base can be heated to 100 DEG C within 10 minutes (or a slightly long time) at room temperature after the front fork body and the clamp are mounted.

Description

Technical Field

[0001] The utility model relates to the field of front fork fatigue test, in particular to a composite material front fork fatigue test heating device. Background Art

[0002] Front fork fatigue test is a test method used to evaluate and verify the strength and fatigue performance of bicycle front forks during long-term use. Bicycle front forks are an important part connecting the front wheel and the frame, and they bear the impact and load during riding. Therefore, their strength and fatigue performance are crucial to riding safety.

[0003] In the prior art, when using an existing front fork fatigue testing machine to conduct a fatigue test on a composite material disc brake fork brake seat, it is difficult to heat the brake seat, and therefore it is difficult to consider whether the composite material front fork will significantly deteriorate under the influence of brake heat. For this reason, we propose a heating device for fatigue testing of a composite material front fork. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a heating device for fatigue test of composite material front fork. When using the existing front fork fatigue testing machine to conduct fatigue test of composite material disc brake front fork brake seat, the device is used to heat the brake seat to a specified temperature to consider whether the composite material front fork will deteriorate significantly under the influence of brake heat.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A composite material front fork fatigue test heating device, comprising a heating device body, wherein the right end of the heating device body is connected to the composite material front fork body;

[0007] The heating device body comprises a base, the upper end of the base is fixedly connected with a clamp, a single-head electric heating tube is installed inside the base, an M6 screw thermocouple is installed inside the clamp, and the outer end of the base is threadedly connected with an M6 top screw.

[0008] By setting a single-head electric heating tube, the power of which ensures that after the front fork body and the clamp are installed, the base can be heated to 100°C within 10 minutes (or a little longer) at room temperature, and can be heated to a maximum of 120°C, maintaining a temperature tolerance of ±5°C. The M6 ​​screw thermocouple is used to measure the temperature of the base and the clamp.

[0009] Furthermore, the M6 ​​top screw is threadedly connected to the single-head electric heating tube, and a pair of wire holes are provided at the bottom of the base.

[0010] The setting of the wire hole is convenient for the wires of the M6 ​​screw thermocouple and the wires of the single-head electric heating tube to pass through the wire hole and be connected to the temperature controller.

[0011] Furthermore, a temperature controller is movably connected to the outside of the base, and the single-head electric heating tube and the M-screw thermocouple are both electrically connected to the temperature controller.

[0012] By setting the thermostat, the temperature can be automatically controlled. The heating temperature should ensure that the temperature of the measuring point in the middle of the gate seat is (100±5)℃, and the temperature is displayed in real time.

[0013] Furthermore, the composite material front fork body comprises a front fork body, a left end of the front fork body is fixedly connected to a front fork riser, and an outer portion of the front fork riser is rotatably connected to a rigid support.

[0014] Furthermore, the rigid support passes through the clamp, and the rigid support and the clamp are connected via a front fork joint.

[0015] Furthermore, a rotating shaft 1 is rotatably connected to the inner side of the front fork body, a loading arm is fixedly connected to the outer end of the rotating shaft 1, and a tongue-shaped disc is connected to the inner side of the front fork body.

[0016] Furthermore, the outer thread of the tongue-shaped disc is connected with a shoulder bolt, and the tongue-shaped disc is connected to the front fork body through the shoulder bolt.

[0017] In summary, the utility model has the following beneficial effects:

[0018] 1. When using an existing front fork fatigue tester to conduct a fatigue test on a composite material disc brake front fork brake seat, the device is used to heat the brake seat to a specified temperature to consider whether the composite material front fork will deteriorate significantly under the influence of brake heat;

[0019] 2. By setting a single-head electric heating tube, the power of the single-head electric heating tube ensures that after the front fork body and the clamp are installed, the base can be heated to 100°C within 10 minutes (or a little longer) at room temperature, and can be heated to a maximum of 120°C, maintaining a temperature tolerance of ±5°C. The M6 ​​screw thermocouple is used to measure the temperature of the base and the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0021] Figure 2 Schematic diagram of the structure of the main body of the heating device in this embodiment;

[0022] Figure 3 is a schematic structural diagram of a side section of the main body of the heating device in this embodiment;

[0023] Figure 4 is a schematic structural diagram of the bottom of the base in this embodiment;

[0024] Figure 5 is a structural schematic diagram of another viewing angle of this embodiment;

[0025] Figure 6 is a schematic structural diagram of a composite material front fork body in this embodiment;

[0026] Figure 7 It is a table diagram of the arm length in this embodiment;

[0027] Figure 8 It is a table diagram of the test cycle and test temperature in this embodiment.

[0028] In the figure, 1. heating device body; 101. base; 102. clamp; 103. single-head electric heating tube; 104. M6 screw thermocouple; 105. M6 top screw; 106. wire hole; 107. temperature controller; 2. composite material front fork body; 201. front fork body; 202. front fork stem; 203. rigid support; 204. front fork assembly; 205. rotating shaft 1; 206. loading arm; 207. tongue-shaped disc; 208. shoulder bolt. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0030] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0031] Reference Figure 1-Figure 8 As shown, a composite material front fork fatigue test heating device in a preferred embodiment of the utility model comprises a heating device body 1, and a composite material front fork body 2 is connected to the right end of the heating device body 1;

[0032] Reference Figure 1-Figure 5 As shown, the heating device body 1 includes a base 101, the upper end of the base 101 is fixedly connected with a clamp 102, a single-head electric heating tube 103 is installed inside the base 101, an M6 screw thermocouple 104 is installed inside the clamp 102, and the outer end of the base 101 is threadedly connected with an M6 top screw 105.

[0033] By setting a single-head electric heating tube 103, the power of the single-head electric heating tube 103 ensures that after the front fork body 201 and the clamp 102 are installed, the base 101 can be heated to 100°C within 10 minutes (or a little longer) at room temperature, and can be heated to a maximum of 120°C, maintaining a temperature tolerance of ±5°C. The M6 ​​screw thermocouple 104 is used to measure the temperature of the base 101 and the clamp 102.

[0034] Reference Figure 1-Figure 5 As shown, the M6 ​​top screw 105 is threadedly connected to the single-head electric heating tube 103, and a pair of wire holes 106 are provided at the bottom of the base 101.

[0035] The setting of the wire hole 106 facilitates the wires of the M6 ​​screw thermocouple 104 and the wires of the single-head electric heating tube 103 to pass through the wire hole 106 and connect with the temperature controller 107, and the M6 ​​top screw 105 facilitates the fixing of the single-head electric heating tube 103.

[0036] Reference Figure 1-Figure 5 As shown, the outside of the base 101 is movably connected to a temperature controller 107 , and the single-head electric heating tube 103 and the M-screw thermocouple are both electrically connected to the temperature controller 107 .

[0037] By setting the temperature controller 107, the temperature can be automatically controlled. The heating temperature should ensure that the temperature of the measuring point in the middle of the gate seat is (100±5)°C, and the temperature is displayed in real time.

[0038] Reference Figure 1 , Figure 5 and Figure 6 As shown, the composite front fork body 2 comprises a front fork body 201 , a front fork stem 202 is fixedly connected to the left end of the front fork body 201 , and a rigid support 203 is rotatably connected to the outside of the front fork stem 202 .

[0039] Reference Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown, the rigid support 203 passes through the clamp 102 , and the rigid support 203 and the clamp 102 are connected via a front fork joint 204 .

[0040] The front fork is mounted in the clamp 102 and clamped with a standard front fork fitting 204. The clamp 102 used to mount the front fork stem 202 prevents the front fork from rotating, but at the same time allows the front fork stem 202 to extend on the load-bearing surface. For a front fork intended for mounting a disc brake, the clamp 102 used has a lever arm length of L2 (see Figure 7 ), if the wheel size is not in Figure 7 If L2 is half the wheel diameter, then

[0041] Reference Figure 1 , Figure 5 , Figure 6 As shown, the inner side of the front fork body 201 is rotatably connected to a rotating shaft 1 205 , the outer end of the rotating shaft 1 205 is fixedly connected to a loading arm 206 , and the inner side of the front fork body 201 is connected to a tongue-shaped disc 207 .

[0042] Reference Figure 1 , Figure 5 , Figure 6 As shown, the outer thread of the tongue-shaped disc 207 is connected with a shoulder bolt 208 , and the tongue-shaped disc 207 is connected to the front fork body 201 via the shoulder bolt 208 .

[0043] The connection point between the shoulder bolt 208 and the tongue-shaped disc 207 should be at a distance R from the hub axle, and its value should reproduce the distance from the hub axle to the force center of the brake pad as much as possible. This connection should only be at the shoulder of the shoulder bolt 208 (for example, not the head of the shoulder bolt 208). The support surface for loading the tongue-shaped disc 207 should be the ray direction of the wheel axle. For the above two types of front forks, in order to measure the fork offset and permanent deformation in the direction of the wheel plane and perpendicular to the axis of the front fork stem 202, an offset measuring device is installed at the front fork axle. In the wheel plane, perpendicular to the axis of the front fork stem 202, a 100N backward static preload is applied to the end of the force arm. After the load is removed, it is repeatedly applied until a constant offset is obtained. The offset measuring device is reset to zero. In the wheel plane, perpendicular to the axis of the front fork stem 202, a 1000N backward force is applied to the end of the force arm, and the force is maintained for 1 minute. The force was then reduced to 100 N and the permanent deformation was recorded.

[0044] Specific implementation process: The test is carried out in two stages, and the maximum test frequency shall comply with the provisions of 4.5 of ISO 4210-3:2023;

[0045] Phase 1:

[0046] At the temperature specified in the first stage, a repeated dynamic force F9600N is applied to the end of the lever arm in the wheel plane, perpendicular to the axis of the front fork seat tube 202, for a specified period;

[0047] Note: The setting of 100℃ is based on the assumption that the gate seat temperature rises due to the heat generated by the disc brake, and the heat generated by the disc brake cannot clearly determine the upper limit of the gate seat temperature. When the composite material exceeds its glass transition temperature, a state change will occur, so heating is used for testing.

[0048] Phase 2

[0049] After the first stage of the test, the heating device is turned off. At the temperature specified in the second stage, a repeated dynamic force F9600N is applied to the end of the force arm in the wheel plane, perpendicular to the axis of the front fork stem 202, and continued for a specified period.

[0050] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A heating device for fatigue testing of composite front forks, characterized in that: It comprises a heating device body (1), the right end of which is connected to a composite material front fork body (2); The heating device body (1) comprises a base (101), the upper end of the base (101) is fixedly connected to a clamp (102), a single-head electric heating tube (103) is installed inside the base (101), an M6 screw thermocouple (104) is installed inside the clamp (102), and the outer end of the base (101) is threadedly connected to an M6 top screw (105).

2. A composite material front fork fatigue test heating device according to claim 1, characterized in that: The M6 ​​top screw (105) is threadedly connected to the single-head electric heating tube (103), and a pair of wire holes (106) are provided at the bottom of the base (101).

3. A composite material front fork fatigue test heating device according to claim 1, characterized in that: The base (101) is movably connected to the outside of a temperature controller (107), and the single-head electric heating tube (103) and the M6 ​​screw thermocouple (104) are both electrically connected to the temperature controller (107).

4. A composite material front fork fatigue test heating device according to claim 1, characterized in that: The composite material front fork body (2) comprises a front fork body (201), the left end of the front fork body (201) is fixedly connected to a front fork riser (202), and the outside of the front fork riser (202) is rotatably connected to a rigid support (203).

5. A composite material front fork fatigue test heating device according to claim 4, characterized in that: The rigid support (203) passes through the clamp (102), and the rigid support (203) and the clamp (102) are connected via a front fork joint (204).

6. A composite material front fork fatigue test heating device according to claim 5, characterized in that: The inner side of the front fork body (201) is rotatably connected to a rotating shaft 1 (205), the outer end of the rotating shaft 1 (205) is fixedly connected to a loading arm (206), and the inner side of the front fork body (201) is connected to a tongue-shaped disc (207).

7. A composite material front fork fatigue test heating device according to claim 6, characterized in that: The external thread of the tongue-shaped disc (207) is connected with a shoulder bolt (208), and the tongue-shaped disc (207) is connected to the front fork body (201) via the shoulder bolt (208).

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