Vehicle frame detection device

Abstract

The utility model relates to the technical field of bicycle processing, in particular to a frame detection device. Wherein the first fixing mechanism and the second fixing mechanism are slidably arranged at the two ends of the base respectively, and the hook claw can be arranged on the second fixing mechanism; the first positioning seat is rotationally connected to the base, the first fixing mechanism is connected to the first positioning seat, the angle gauge is arranged on the base and used for measuring the included angle between the axis of a bicycle head connector and the connecting line of the axes of front and rear wheels of a bicycle frame, the first ruler is arranged on the base, and the front fork simulation part is slidably connected to the first ruler. The front fork simulation piece can move relative to the first ruler tool so as to simulate the position of the front fork, and the first ruler tool can measure the distance between the axis of the vertical rod of the front fork and the center of the hook claw. The device can detect the included angle between the axis of the vehicle head connector and the connecting line of the front wheel axis and the rear wheel axis of the vehicle frame and the distance between the axis of the front fork vertical rod and the center of the hook claw, qualified vehicle frames are screened out, the vehicle quality is improved, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle processing, in particular to a bicycle frame detection device. Background Art

[0002] The frame is the core of a bicycle, its basic structure, its backbone, and its main body. All other components are directly or indirectly mounted to it, and the frame has the greatest impact on the correctness and comfort of riding posture. As products become increasingly advanced, the requirements for frame precision are also increasing accordingly. However, frame manufacturing errors can occur, and frame precision cannot be guaranteed, resulting in a decline in vehicle quality and reduced product competitiveness.

[0003] Therefore, there is an urgent need for a vehicle frame detection device to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a vehicle frame detection device, which can detect the accuracy of the vehicle frame and improve the quality of the vehicle.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A frame detection device, the frame including a front joint, a middle tube joint, a five-way joint, a dropout, an upper tube, a down tube, a middle tube, an upper fork, and a down fork, the front joint being connected to the upper tube and the down tube respectively, the middle tube joint being connected to the upper tube, the middle tube, and the upper fork respectively, the five-way joint being connected to the middle tube, the down tube, and the down fork respectively, the dropouts being connected to the upper fork and the down fork respectively, the frame detection device comprising:

[0007] base;

[0008] a first fixing mechanism, the first fixing mechanism being rotatably mounted on the base, and the front end joint being capable of being mounted on the first fixing mechanism;

[0009] a second fixing mechanism, the second fixing mechanism being slidably disposed on the base, and the first fixing mechanism and the second fixing mechanism being slidably disposed on two ends of the base respectively, and the hook being capable of being disposed on the second fixing mechanism;

[0010] The first detection mechanism includes a first positioning seat, an inclinometer, a front fork simulation component and a first ruler. The first positioning seat is rotatably connected to the base. The first fixing mechanism is connected to the first positioning seat. The inclinometer is arranged on the base. The inclinometer is used to measure the angle between the axis of the front joint and the line connecting the front and rear wheel axles of the frame. The first ruler is arranged on the base. The front fork simulation component is slidably connected to the first ruler. The front fork simulation component can move relative to the first ruler to simulate the position of the front fork. The first ruler can measure the distance between the axis of the front fork vertical rod and the center of the claw.

[0011] As a preferred technical solution of the above-mentioned frame detection device, the frame detection device also includes a second ruler and a positioning piece, the second ruler is arranged on the base, the positioning piece is slidably arranged on the second ruler along the vertical direction, the five-way joint is arranged on the positioning piece, and the second ruler can measure the distance between the five-way joint and the ground.

[0012] As a preferred technical solution of the above-mentioned frame detection device, the frame detection device also includes a first locking piece, the positioning piece is arranged on one side of the second ruler, the first locking piece is arranged on the other side of the second ruler, and one end of the first locking piece can pass through the second ruler and be connected to the positioning piece.

[0013] As a preferred technical solution of the above-mentioned frame detection device, the second ruler is provided with a long through hole in the vertical direction, one end of the first locking member can pass through the long through hole and be connected to the positioning member, and the first locking member can move along the length direction of the long through hole.

[0014] As a preferred technical solution of the above-mentioned frame detection device, the frame detection device also includes a third ruler, one end of the third ruler is connected to the positioning member, and the other end of the third ruler can be selectively connected to the front fork simulation member or the second fixing mechanism.

[0015] As a preferred technical solution of the above-mentioned frame detection device, the third ruler includes a slider and a measuring tool, the slider is slidably mounted on the outer periphery of the measuring tool, the slider can be connected to the positioning member, and the end of the measuring tool away from the slider can be selectively connected to the front fork simulation component or the second fixing mechanism.

[0016] As a preferred technical solution of the above-mentioned frame detection device, the third ruler also includes a second locking member and a third locking member, the second locking member is arranged on the slider, and the third locking member is arranged at the end of the measuring tool away from the slider.

[0017] As an optimal technical solution of the above-mentioned frame detection device, the first fixing mechanism includes a positioning block and a positioning rod, the positioning block is connected to one end of the positioning rod, the positioning block can be connected to the vehicle front joint, and the other end of the positioning rod can be inserted into the first detection mechanism.

[0018] As a preferred technical solution of the above-mentioned frame detection device, the second fixing mechanism includes a mounting seat and a second positioning seat, the mounting seat is slidably arranged on the base, the second positioning seat is arranged on the mounting seat, and the hook can be arranged on the second positioning seat.

[0019] As a preferred technical solution of the above-mentioned frame detection device, the second fixing mechanism also includes a third positioning seat, which is arranged on the mounting seat, and the third positioning seat is close to the first detection mechanism relative to the second positioning seat, and the lower fork can be arranged on the third positioning seat.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a frame detection device. The frame includes a front joint, a middle pipe joint, a five-way joint, a dropout, an upper tube, a lower tube, a middle pipe, an upper fork and a lower fork. The front joint is connected to the upper tube and the lower tube respectively, the middle pipe joint is connected to the upper tube, the middle pipe and the upper fork respectively, the five-way joint is connected to the middle pipe, the lower tube and the lower fork respectively, and the dropout is connected to the upper fork and the lower fork respectively. The frame detection device includes: a base, a first fixing mechanism, a second fixing mechanism and a first detection mechanism. The first fixing mechanism is rotatably arranged with the base, and the front joint can be arranged with the first fixing mechanism; the second fixing mechanism is slidably arranged with the base, and the first fixing mechanism and the second fixing mechanism are slidably arranged with the base. The first detection mechanism includes a first positioning seat, an inclinometer, a front fork simulator, and a first ruler. The first positioning seat is rotatably connected to the base, the first fixing mechanism is connected to the first positioning seat, the inclinometer is set on the base, the inclinometer is used to measure the angle between the axis of the front joint and the line connecting the front and rear wheel axles of the frame, the first ruler is set on the base, the front fork simulator is slidably connected to the first ruler, the front fork simulator can move relative to the first ruler, and thus simulate the position of the front fork, and the first ruler can measure the distance between the axis of the front fork vertical rod and the center of the hook. Through this device, the angle between the axis of the front joint and the line connecting the front and rear wheel axles of the frame and the distance between the axis of the front fork vertical rod and the center of the hook can be detected, and qualified frames can be screened out, thereby improving vehicle quality and product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a vehicle frame provided in an embodiment of the present utility model;

[0024] Figure 2 A first structural diagram of a vehicle frame detection device provided in an embodiment of the present utility model;

[0025] Figure 3 A second structural schematic diagram of the vehicle frame detection device provided in an embodiment of the present utility model;

[0026] Figure 4 A first structural diagram of a first detection mechanism provided in an embodiment of the present utility model;

[0027] Figure 5 This is a second structural schematic diagram of the first detection mechanism provided in an embodiment of the present utility model.

[0028] In the picture:

[0029] 1. Front joint; 2. Middle tube joint; 3. Five-way joint; 4. Dropout; 5. Upper tube; 6. Lower tube; 7. Middle tube; 8. Upper fork; 9. Lower fork; 10. Base; 11. First fixing mechanism; 111. Positioning block; 112. Positioning rod; 12. Second fixing mechanism; 121. Mounting seat; 122. Second positioning seat; 123. Third positioning seat; 13. First detection mechanism; 131. First positioning seat; 132. Angle meter; 133. Front fork simulator; 134. First ruler; 135. Fourth positioning seat; 14. Second ruler; 141. Long through hole; 15. Positioning member; 16. First locking member; 17. Third ruler; 171. Slider; 172. Measuring tool; 173. Third locking member; 18. Slide rail. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] like Figures 1 to 5 As shown, the present invention provides a frame detection device. The frame includes a front joint 1, a middle tube joint 2, a bottom bracket joint 3, a dropout 4, an upper tube 5, a lower tube 6, a middle tube 7, an upper fork 8, and a lower fork 9. The front joint 1 is connected to the upper tube 5 and the lower tube 6 respectively, the middle tube joint 2 is connected to the upper tube 5, the middle tube 7, and the upper fork 8 respectively, the bottom bracket joint 3 is connected to the middle tube 7, the lower tube 6, and the lower fork 9 respectively, and the dropout 4 is connected to the upper fork 8 and the lower fork 9 respectively. The frame detection device includes: a base 10, a first fixing mechanism 11, a second fixing mechanism 12, and a first detection mechanism 13.

[0035] Specifically, the first fixing mechanism 11 is rotatably set on the base 10, and the front joint 1 can be set on the first fixing mechanism 11; the second fixing mechanism 12 is slidably set on the base 10, and the first fixing mechanism 11 and the second fixing mechanism 12 are respectively slidably set at the two ends of the base 10, and the hook 4 can be set on the second fixing mechanism 12; the first detection mechanism 13 includes a first positioning seat 131, an inclinometer 132, a front fork simulation member 133 and a first ruler 134, the first positioning seat 131 is rotatably connected to the base 10, the first fixing mechanism 11 is connected to the first positioning seat 131, the inclinometer 132 is set on the base 10, the inclinometer 132 is used to measure the angle between the axis of the front joint 1 and the line connecting the front and rear wheel axles of the frame, the first ruler 134 is set on the base 10, the front fork simulation member 133 is slidably connected to the first ruler 134, the front fork simulation member 133 can move relative to the first ruler 134, thereby simulating the position of the front fork, and the first ruler 134 can measure the distance between the axis of the front fork vertical rod and the center of the hook 4. This device can detect the angle between the axis of the front joint 1 and the line connecting the front and rear wheel axes of the frame, as well as the distance between the axis of the front fork stem and the center of the dropout 4, thereby screening qualified frames, improving vehicle quality, and enhancing product competitiveness. It should be noted that the length represented by the scale marks 134 on the first ruler is the distance between the axis of the front fork stem and the center of the dropout 4.

[0036] Optionally, the frame detection device also includes two slide rails 18, which are spaced apart from each other on the base 10. The second fixing mechanism 12 is slidably mounted on both slide rails 18. This reduces the shaking of the first fixing mechanism 11 and the second fixing mechanism 12 during measurement, improving measurement accuracy. It is also applicable to frames of different sizes, increasing the versatility of the frame detection device. Furthermore, personnel calculate the precise dimensions of the frame using 3D simulation technology, then use the detection device to detect the actual dimensions of the frame to determine whether the frame meets the requirements.

[0037] Optionally, the frame inspection device also includes a second ruler 14 and a positioning member 15. The second ruler 14 is mounted on the base 10, and the positioning member 15 slides vertically on the second ruler 14. The bottom bracket joint 3 is mounted on the positioning member 15. The second ruler 14 can measure the distance between the bottom bracket joint 3 and the ground. Specifically, the second ruler 14 is fixed to the base 10, and one end of the positioning member 15 slides on the second ruler 14. The bottom bracket joint 3 is sleeved on the outer periphery of the positioning member 15 from the other end. Based on the data obtained by simulation, the staff member moves the positioning member 15 to move the bottom bracket joint 3 and adjust the bottom bracket joint 3 to a set height. Furthermore, the positioning member 15 is made of CR12MOV, which reduces gauge wear and improves the measurement accuracy and service life of the gauge.

[0038] Furthermore, the frame detection device also includes a first locking member 16, the positioning member 15 is arranged on one side of the second ruler 14, and the first locking member 16 is arranged on the other side of the second ruler 14, and one end of the first locking member 16 can pass through the second ruler 14 and connect with the positioning member 15, so as to fix the positioning member 15 and prevent the positioning member 15 from moving.

[0039] Optionally, the second ruler 14 is provided with an elongated through-hole 141 along the vertical direction, through which one end of the first locking member 16 can pass to connect with the positioning member 15, and the first locking member 16 can move along the length of the elongated through-hole 141. This arrangement ensures smooth movement of the first locking member 16 and maintains connection with the positioning member 15, preventing the positioning member 15 from falling.

[0040] Optionally, the frame inspection device further includes a third ruler 17, one end of which is connected to the positioning member 15, and the other end of which can be selectively connected to the front fork simulator 133 or the second fixing mechanism 12. Specifically, when the ends of the third ruler 17 are respectively connected to the positioning member 15 and the first positioning seat 131, the third ruler 17 can measure the distance from the front wheel axle to the axis of the bottom bracket joint 3; when the ends of the third ruler 17 are respectively connected to the positioning member 15 and the second fixing mechanism 12, the third ruler 17 can measure the distance from the rear wheel axle to the axis of the bottom bracket joint 3.

[0041] Furthermore, the third ruler 17 includes a slider 171 and a measuring tool 172. The slider 171 is slidably mounted on the outer periphery of the measuring tool 172. The slider 171 can be connected to the positioning member 15. The end of the measuring tool 172, away from the slider 171, can be selectively connected to the front fork simulator 133 or the second fixing mechanism 12. This allows the detection of frames of different sizes, improving the versatility of the frame detection device. Furthermore, the scale of the measuring tool 172 uses a black background with white lines, which is clear and easy to read.

[0042] Optionally, the third ruler 17 further includes a second locking member and a third locking member 173. The second locking member is arranged on the slider 171, and the third locking member 173 is arranged at the end of the measuring tool 172 away from the slider 171. The second locking member can be connected to the positioning member 15, and the third locking member 173 can be selectively connected to the front fork simulation member 133 or the second fixing mechanism 12, which can improve the stability of the third ruler 17 and improve the detection accuracy.

[0043] Optionally, the first fixing mechanism 11 includes a positioning block 111 and a positioning rod 112. The positioning block 111 is connected to one end of the positioning rod 112, and the positioning block 111 can be connected to the front joint 1. The other end of the positioning rod 112 can be inserted into the first detection mechanism 13. Specifically, the front joint 1 is sleeved on the outer periphery of the positioning block 111 and fixed by bolts to improve the stability of the frame and prevent the frame from shaking. The positioning rod 112 is inserted into the first positioning seat 131, which can rotate the positioning rod 112. At this time, the degree of the inclinometer 132 is the angle between the axis of the front joint 1 and the line connecting the front and rear wheel axles of the frame.

[0044] Optionally, the second fixing mechanism 12 includes a mounting seat 121 and a second positioning seat 122. The mounting seat 121 is slidably mounted on the base 10, the second positioning seat 122 is mounted on the mounting seat 121, and the hook 4 can be mounted on the second positioning seat 122. Specifically, the mounting seat 121 is slidably mounted on the two slide rails 18, and the second positioning seat 122 is mounted on the mounting seat 121, which can improve the stability of the second positioning seat 122. The hook 4 can be mounted on the second positioning seat 122 to prevent the hook 4 from separating from the second positioning seat 122.

[0045] Optionally, the second fixing mechanism 12 also includes a third positioning seat 123, which is arranged on the mounting seat 121, and the third positioning seat 123 is close to the first detection mechanism 13 relative to the second positioning seat 122. The lower fork 9 can be set on the third positioning seat 123, which can further improve the stability of the frame.

[0046] Optionally, the first detection mechanism 13 also includes a fourth positioning seat 135, the fourth positioning seat 135 is slidably set on the two slide rails 18, the front fork simulation component 133 is slidably set on the fourth positioning seat 135, and the first ruler 134 is fixed to the fourth positioning seat 135, which enables the device to be suitable for frames of different sizes and improves the versatility of the frame detection device.

[0047] The steps for using the frame detection device provided by the utility model are as follows:

[0048] 1. First, put the five-way joint 3 on the positioning piece 15;

[0049] 2. Then, sleeve the hook 4 onto the second positioning seat 122;

[0050] 3. Clamp the front joint 1 with the positioning block 111 according to the simulated front fork height, and then insert the positioning rod 112 into the first positioning seat 131;

[0051] 4. Then, according to the distance between the simulated front fork vertical rod axis and the center of the dropout 4, slide the front fork simulation member 133 to the corresponding position of the first ruler 134 to determine the position of the front fork axis;

[0052] 5. Use the inclinometer 132 to read the angle between the axis of the front joint 1 and the line connecting the front and rear wheel axles of the frame;

[0053] 6. Then, tighten the first locking member 16 and use the second ruler 14 to read the distance between the five-way joint 3 and the ground.

[0054] 7. Then, connect the second locking member to the positioning member 15 and the third locking member 173 to the front fork simulation member 133. The distance from the front wheel axis to the axis of the bottom bracket joint 3 can be read on the measuring tool 172. It should be noted that the front fork axis is the front wheel axis.

[0055] 8. Then connect the second locking member to the positioning member 15 and the third locking member 173 to the second positioning seat 122. The distance from the rear wheel axle to the axis of the five-way joint 3 can be read on the measuring tool 172. It should be noted that the axis of the claw 4 is the rear wheel axle.

[0056] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A frame detection device, the frame comprising a front joint (1), a middle tube joint (2), a five-way joint (3), a dropout (4), an upper tube (5), a lower tube (6), a middle tube (7), an upper fork (8) and a lower fork (9), wherein the front joint (1) is connected to the upper tube (5) and the lower tube (6), respectively, the middle tube joint (2) is connected to the upper tube (5), the middle tube (7) and the upper fork (8), respectively, the five-way joint (3) is connected to the middle tube (7), the lower tube (6) and the lower fork (9), and the dropout (4) is connected to the upper fork (8) and the lower fork (9), respectively, characterized in that: The frame detection device comprises: Base (10); A first fixing mechanism (11), wherein the first fixing mechanism (11) is rotatably arranged on the base (10), and the front joint (1) can be arranged on the first fixing mechanism (11); a second fixing mechanism (12), the second fixing mechanism (12) being slidably arranged on the base (10), and the first fixing mechanism (11) and the second fixing mechanism (12) being slidably arranged on two ends of the base (10), respectively, and the hook (4) being capable of being arranged on the second fixing mechanism (12); A first detection mechanism (13) includes a first positioning seat (131), an inclinometer (132), a front fork simulation component (133) and a first ruler (134). The first positioning seat (131) is rotatably connected to the base (10). The first fixing mechanism (11) is connected to the first positioning seat (131). The inclinometer (132) is arranged on the base (10). The inclinometer (132) is used to measure the angle between the axis of the front joint (1) and the line connecting the front and rear wheel axles of the frame. The first ruler (134) is arranged on the base (10). The front fork simulation component (133) is slidably connected to the first ruler (134). The front fork simulation component (133) can move relative to the first ruler (134) to simulate the position of the front fork. The first ruler (134) can measure the distance between the axis of the front fork vertical rod and the center of the hook (4).

2. A vehicle frame detection device according to claim 1, characterized in that: The frame detection device further comprises a second ruler (14) and a positioning member (15), wherein the second ruler (14) is arranged on the base (10), the positioning member (15) is slidably arranged on the second ruler (14) along a vertical direction, the five-way joint (3) is arranged on the positioning member (15), and the second ruler (14) can measure the distance between the five-way joint (3) and the ground.

3. A vehicle frame detection device according to claim 2, characterized in that: The frame detection device further includes a first locking member (16), the positioning member (15) is arranged on one side of the second ruler (14), the first locking member (16) is arranged on the other side of the second ruler (14), and one end of the first locking member (16) can pass through the second ruler (14) and be connected to the positioning member (15).

4. A vehicle frame detection device according to claim 3, characterized in that: The second ruler (14) is provided with a long through hole (141) in a vertical direction, one end of the first locking member (16) can pass through the long through hole (141) to be connected to the positioning member (15), and the first locking member (16) can move along the length direction of the long through hole (141).

5. The vehicle frame detection device according to claim 2, characterized in that: The frame detection device further comprises a third ruler (17), one end of the third ruler (17) being connected to the positioning member (15), and the other end of the third ruler (17) being selectively connectable to the front fork simulation member (133) or the second fixing mechanism (12).

6. A vehicle frame detection device according to claim 5, characterized in that: The third ruler (17) includes a slider (171) and a measuring tool (172). The slider (171) is slidably mounted on the outer periphery of the measuring tool (172). The slider (171) can be connected to the positioning member (15). The end of the measuring tool (172) away from the slider (171) can be selectively connected to the front fork simulation member (133) or the second fixing mechanism (12).

7. A vehicle frame detection device according to claim 6, characterized in that: The third ruler (17) further comprises a second locking member and a third locking member (173), wherein the second locking member is arranged on the slider (171), and the third locking member (173) is arranged on an end of the measuring tool (172) away from the slider (171).

8. A vehicle frame detection device according to any one of claims 1 to 7, characterized in that: The first fixing mechanism (11) comprises a positioning block (111) and a positioning rod (112); the positioning block (111) is connected to one end of the positioning rod (112); the positioning block (111) can be connected to the vehicle head joint (1); and the other end of the positioning rod (112) can be inserted into the first detection mechanism (13).

9. A vehicle frame detection device according to any one of claims 1 to 7, characterized in that: The second fixing mechanism (12) comprises a mounting seat (121) and a second positioning seat (122); the mounting seat (121) is slidably arranged on the base (10); the second positioning seat (122) is arranged on the mounting seat (121); and the hook (4) can be arranged on the second positioning seat (122).

10. The vehicle frame detection device according to claim 9, characterized in that: The second fixing mechanism (12) further includes a third positioning seat (123), the third positioning seat (123) being arranged on the mounting seat (121), and the third positioning seat (123) being closer to the first detection mechanism (13) relative to the second positioning seat (122), and the lower fork (9) can be arranged on the third positioning seat (123).

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