Press fitting tool and press fitting method for front vertical pipe of motorcycle

Abstract

The invention relates to the technical field of motorcycle manufacturing, and discloses a motorcycle front vertical pipe press-fitting tool and method.The press-fitting tool comprises a base, a jacking head, a lower pressing head, an elastic lifting assembly and a supporting assembly, the supporting assembly comprises a sleeve, a push rod, an upper jacking column and a lower jacking column, and a connecting pipe is arranged on the side portion of the sleeve; the push rod is inserted into the connecting pipe and is in threaded connection with the connecting pipe, the end, close to the sleeve, of the push rod extends into the sleeve and is provided with a pushing head, the pushing head is in a conical shape which is gradually narrowed in the direction close to the sleeve, the upper jacking column and the lower jacking column are inserted into the sleeve and are in sliding connection with the sleeve, and the upper jacking column is arranged above the pushing head; a first guide face matched with the pushing head is arranged at the bottom of the upper jacking column, the lower jacking column is arranged below the pushing head, and a second guide face matched with the pushing head is arranged at the top of the lower jacking column. The invention further discloses a press fitting method using the tool, and during press fitting, the supporting assembly can prevent the front vertical pipe from deforming in the press fitting process.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle manufacturing, in particular to a press-fitting tool and a press-fitting method for a front riser of a motorcycle. Background Art

[0002] At present, the front riser of a motorcycle is an important part of the motorcycle frame. It is mainly responsible for supporting the front wheel and steering system of the motorcycle and is a key component of the motorcycle steering and front wheel suspension. It connects the front shock absorber, the front wheel and the frame together, and withstands the impact force from the road surface and the lateral force during steering. In the manufacturing process of the motorcycle, it is necessary to install the seat ring at the top and bottom of the front riser. The installation steps are generally to place the seat ring on the pressure head of the press tool, and then place the front riser at the position of the pressure head, and then start the press machine to drive the pressure head to press down until the seat ring on the pressure head is pressed into the interior of the front riser.

[0003] With the update and iteration of motorcycles, the designs of motorcycle frames are endless. In some designs, a hollow groove is opened on the side of the front riser to form a mounting cavity for assembling certain components, such as Figure 1 As shown, the front riser 9 includes a groove body 91, an upper tube 92 and a lower tube 93. A hollow groove 911 is provided on the side of the groove body 91, an upper tube is provided on the top of the groove body, and a lower tube is provided on the bottom of the groove body. However, the conventional seat ring press-fitting tool does not take into account the structure of the hollow groove of the front riser, resulting in that in such a front riser, the top and bottom of the hollow groove of the front riser cannot withstand the press-fitting pressure and are concavely deformed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a front riser press fitting tool and a press fitting method which can provide support for the hollow groove of the front riser to prevent it from deforming during the press fitting process and ensure the press fitting accuracy.

[0005] In order to solve the above technical problems, the present invention provides a motorcycle front riser press fitting, comprising a base, a top pressure head, a bottom pressure head, an elastic lifting assembly and a support assembly, wherein the top pressure head is installed on the base, the bottom pressure head is arranged above the top pressure head, the bottom pressure head is used to be connected to the output end of the hydraulic press, the elastic lifting assembly is arranged on the base, the elastic lifting assembly is used to support the frame, the support assembly comprises a sleeve, a push rod, an upper push column and a lower push column, the side of the sleeve is provided with a connecting pipe, the push rod is inserted in the The push rod is inserted into the connecting tube and is threadedly connected to the connecting tube, one end of the push rod close to the sleeve extends into the sleeve and is provided with a pushing head, the pushing head is in a tapered shape which gradually narrows towards the direction close to the sleeve, the upper push column and the lower push column are respectively inserted into the sleeve and slidably connected to the sleeve, the upper push column is arranged above the pushing head, the bottom of the upper push column is provided with a first guide surface which cooperates with the pushing head, the lower push column is arranged below the pushing head, and the top of the lower push column is provided with a second guide surface which cooperates with the pushing head.

[0006] As a preferred embodiment of the present invention, the elastic lifting assembly includes a fixed block, a fixed tube, a spring, a movable column, a movable block, a connecting block and a lifting block, the fixed block is installed on the base, the fixed tube is installed on the top of the fixed block, the movable column can be slidably inserted in the fixed tube, the movable block is installed on the top of the movable column, the spring is sleeved on the movable column and is located between the movable block and the fixed tube, the connecting block is installed on the movable block, the lifting block is installed on the connecting block, and the top of the lifting block is provided with a positioning groove for positioning the frame.

[0007] As a preferred solution of the present invention, a guide column is provided on the side of the fixed block, a guide groove is provided along the vertical direction on the side of the guide column close to the fixed block, and a guide block is provided on the side of the movable block to slide with the guide groove.

[0008] As a preferred solution of the present invention, the connecting block is arranged on one side of the movable block, a plurality of adjusting gaskets are overlapped between the connecting block and the mounting block, and the movable block is connected to the connecting block via a connecting piece.

[0009] As a preferred solution of the present invention, a mounting block is provided on the base, the top pressure head is installed on the mounting block, a mounting hole is provided on the top of the mounting block, a locking bolt threadedly connected to the base is inserted in the mounting hole, the outer diameter of the locking bolt is smaller than the aperture of the mounting hole, a first adjusting block is provided on a lateral side of the mounting block, a plurality of overlapping first gaskets are provided between the first adjusting block and the mounting block, the first adjusting block is provided with a first slot hole arranged in the longitudinal direction, a first connecting bolt passes through the first slot hole and is connected to the mounting block, a second adjusting block is provided on a longitudinal side of the mounting block, a plurality of overlapping second gaskets are provided between the second adjusting block and the mounting block, the second adjusting block is provided with a second slot hole arranged in the longitudinal direction, a second connecting bolt passes through the second slot hole and is connected to the mounting block.

[0010] As a preferred solution of the present invention, columns installed on the base are respectively provided on both sides of the top pressure head, the columns are slidably connected to a lower pressure plate, and the lower pressure head is installed at the bottom of the lower pressure plate.

[0011] As a preferred solution of the present invention, a limiting groove arranged vertically is provided on the side of the upper top column, and a limiting shaft slidingly matched with the limiting groove is fixed on the side of the sleeve.

[0012] As a preferred solution of the present invention, a limiting ring is provided inside the bottom end of the sleeve, and a protruding portion that slidably cooperates with the inner ring of the limiting ring is provided at the bottom of the lower ejector column.

[0013] At the same time, the present invention also provides a press-fitting method using the above-mentioned motorcycle front riser press-fitting tool, wherein the side of the front riser is provided with a hollow groove, comprising the following steps:

[0014] S1: seat rings are respectively mounted on the top pressure head and the lower pressure head, and the lower pressure head is connected to the output end of the hydraulic press;

[0015] S2: placing the frame on the elastic lifting assembly so that the bottom end of the front riser is aligned with the top pressure head;

[0016] S3: placing the sleeve into the hollow groove, and then rotating the push rod so that the top end of the upper top column abuts against the top wall of the hollow groove, and the bottom end of the lower top column abuts against the bottom wall of the hollow groove;

[0017] S4: operating the hydraulic press to gradually lower the lower pressure head until the seat ring on the lower pressure head is pressed into the top end of the front standpipe and the seat ring on the top pressure head is pressed into the bottom end of the front standpipe;

[0018] S5: Operate the hydraulic press to make the upper pressure head rise and separate from the top of the front vertical pipe, then rotate the push rod to separate the top of the upper push column from the top of the hollow groove, then take the sleeve out of the hollow groove, and finally remove the frame from the elastic lifting assembly.

[0019] The embodiment of the present invention is a press-fitting tool and press-fitting method for a front riser of a motorcycle. Compared with the prior art, the beneficial effect lies in that the push head of the present invention is tapered and gradually narrows in the direction approaching the sleeve, that is, the diameter of the top cone head gradually decreases in the direction approaching the sleeve, and the push rod is threadedly connected to the connecting pipe, so the push rod is rotated to move the push rod in the direction approaching the sleeve. At this time, under the action of the push head cooperating with the first guide surface and the second guide surface respectively, the upper push block will rise and the lower push block will fall. During the press-fitting process, the sleeve is arranged in the hollow groove of the front riser, and the push rod is rotated so that the top end of the upper push column abuts against the top wall of the hollow groove, and the bottom end of the lower push column abuts against the bottom wall of the hollow groove. After that, when the front riser is pressurized, the support assembly can play a supporting role, thereby resisting the deformation of the top and bottom of the hollow groove during the press-fitting process, so as to reduce the deformation of the front riser, ensure the concentricity offset between it and the seat ring, and improve the press-fitting qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structure of a front riser having a hollow slot;

[0021] Figure 2 is a structural diagram of the press-fitting tool of the present invention;

[0022] Figure 3 is a structural diagram of the support assembly of the present invention;

[0023] Figure 4 is a cross-sectional view of a support assembly of the present invention;

[0024] Figure 5 is a structural diagram of the elastic lifting assembly of the present invention;

[0025] Figure 6 yes Figure 4 The fracture structure diagram of

[0026] Figure 7 It is a structural diagram of the mounting block, the first adjusting block and the second adjusting block of the present invention;

[0027] Figure 8 This is a structural diagram of the connection between the lower pressing head and the lower pressing plate of the present invention;

[0028] In the figure, 1, base; 11, column; 2, top pressure head; 3, lower pressure head; 31, lower pressure plate; 4, elastic lifting assembly; 41, fixed block; 42, fixed pipe; 43, spring; 44, movable column; 45, movable block; 451, guide block; 452, connecting piece; 453, adjusting gasket; 46, connecting block; 47, lifting block; 471, positioning groove; 48, guide column; 481, guide groove; 5, supporting assembly; 51, sleeve; 511, connecting pipe; 512, limiting shaft; 513, limiting ring; 52, push rod ; 521, push head; 53, upper push column; 531, first guide surface; 532, limit groove; 54, lower push column; 541, second guide surface; 542, ejection part; 6, mounting block; 61, mounting hole; 62, locking bolt; 7, first adjusting block; 71, first gasket; 72, first slot hole; 73, first connecting bolt; 8, second adjusting block; 81, second gasket; 82, second slot hole; 83, second connecting bolt; 9, front vertical pipe; 91, slot body; 911, hollow slot; 92, upper pipe; 93, lower pipe. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be understood that the present invention adopts the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] like Figure 2-8As shown, a motorcycle front riser press-fitting tool according to a preferred embodiment of the present invention comprises a base 1, a top pressing head 2, a bottom pressing head 3, an elastic lifting assembly 4 and a supporting assembly 5. The top pressing head 2 is mounted on the base 1, the bottom pressing head 3 is arranged above the top pressing head 2, the bottom pressing head 3 is used to be connected to the output end of the hydraulic press, the bottom pressing head 3 and the top pressing head 2 are arranged along the direction respectively, the elastic lifting assembly 4 is arranged on the base 1, and the elastic lifting assembly 4 is used to support the frame. When the frame is placed on the elastic lifting assembly 4, When the frame is under pressure, the frame can move downward a certain distance. At this time, the elastic lifting component 4 will generate elastic force. Thereafter, when the frame is no longer under pressure, the frame will return to its original position under the action of the elastic force generated by the elastic lifting component 4. The elastic lifting support component 5 includes a sleeve 51, a push rod 52, an upper top column 53 and a lower top column 54. A connecting pipe 511 is provided on the side of the sleeve 51. The interior of the connecting pipe 511 is connected to the interior of the sleeve 51. The push rod 52 is inserted into the connecting pipe 511 and The push rod 52 is threadedly connected to the connecting pipe 511, and one end of the push rod 52 close to the sleeve 51 extends into the sleeve 51 and is provided with a push head 521. The push head 521 is tapered and gradually narrows toward the sleeve 51. The upper push column 53 and the lower push column 54 are respectively inserted into the sleeve 51 and slidably connected to the sleeve 51. The upper push column 53 is arranged above the push head 521, and the bottom of the upper push column 53 is provided with a first guide surface 531 that cooperates with the push head 521. The lower push column 54 is arranged at the top of the push head 521. At the bottom, a second guide surface 541 cooperating with a push head 521 is provided at the top of the lower push column 54. Since the push head 521 is in a tapered shape that gradually narrows in the direction approaching the sleeve 51, that is, the diameter of the top cone head gradually decreases in the direction approaching the sleeve 51, the push rod 52 is rotated to move the push rod 52 in the direction approaching the sleeve 51. At this time, under the action of the push head 521 cooperating with the first guide surface 531 and the second guide surface 541 respectively, the upper push block will rise, while the lower push block will fall.

[0032] At the same time, the present invention also provides a press-fitting method using the above-mentioned motorcycle front riser press-fitting tool, wherein the side of the front riser is provided with a hollow groove, and the hollow groove is provided with a top wall and a bottom wall, comprising the following steps:

[0033] S1: seat rings are respectively mounted on the top pressure head 2 and the lower pressure head 3, and the lower pressure head 3 is connected to the output end of the hydraulic press, and the output end of the hydraulic press can drive the lower pressure head 3 to rise or fall;

[0034] S2: placing the frame on the elastic lifting assembly 4 so that the bottom end of the front standpipe is aligned with the top pressure head 2. Generally, at this time, the front standpipe is vertically arranged;

[0035] S3: Put the sleeve 51 into the hollow groove, and then rotate the push rod 52 to move the push rod 52 toward the sleeve 51. At this time, under the cooperation of the push head 521 with the first guide surface 531 and the second guide surface 541, the upper push block will rise and the lower push block will fall, so that the top end of the upper push column 53 abuts against the top wall of the hollow groove, and the bottom end of the lower push column 54 abuts against the bottom wall of the hollow groove;

[0036] S4: Control the hydraulic press to gradually lower the lower pressure head 3 until the seat ring on the lower pressure head 3 is pressed into the top end of the front vertical tube and the seat ring on the top pressure head 2 is pressed into the bottom end of the front vertical tube. When the frame is pressed, the frame can move downward for a certain distance. At this time, the elastic lifting component 4 will generate elastic force. When the lower pressure head 3 pushes the front vertical tube downward, the supporting component 5 plays a supporting role, which can prevent the top and bottom of the hollow groove from being deformed by pressure, thereby ensuring the accuracy of press-fitting.

[0037] S5: Operate the hydraulic press to make the upper pressure head rise and separate from the top of the front vertical pipe. At this time, under the action of the elastic force generated by the elastic lifting component 4, the frame will return to its original position, and then rotate the push rod 52 to separate the top of the upper support column 53 from the top of the hollow groove, then take the sleeve 51 out of the hollow groove, and finally remove the frame from the elastic lifting component 4.

[0038] The push head 521 of the present invention is tapered and gradually narrows in the direction approaching the sleeve 51, that is, the diameter of the top cone head gradually decreases in the direction approaching the sleeve 51, and the push rod 52 is threadedly connected to the connecting pipe 511, so the push rod 52 is rotated to move the push rod 52 in the direction approaching the sleeve 51. At this time, under the action of the push head 521 cooperating with the first guide surface 531 and the second guide surface 541 respectively, the upper push block will rise and the lower push block will fall. During the press-fitting process, the sleeve 51 is arranged in the hollow groove of the front vertical pipe, and the push rod 52 is rotated to make the top end of the upper push column 53 abut against the top wall of the hollow groove, and the bottom end of the lower push column 54 abut against the bottom wall of the hollow groove. After that, when the front vertical pipe is pressed, the support assembly 5 can play a supporting role to resist the deformation of the top and bottom of the hollow groove during the press-fitting process, thereby reducing the deformation of the front vertical pipe, ensuring the concentricity offset between it and the seat ring, and improving the press-fitting qualified rate.

[0039] Compared with the traditional press-fitting tooling, the present invention is provided with a support component 5, which is provided with a support component 5. During the press-fitting process, the deformation of the front riser is likely to exceed the elastic deformation range of the material, resulting in permanent deformation. Therefore, in addition to reducing the press-fitting force, the feed speed of the press-fitting needs to be slowed down, and the control accuracy of the hydraulic press output needs to be improved to prevent the front riser from being deformed due to excessive feed speed. The present invention is provided with a support component 5 capable of resisting deformation of the front riser of the motorcycle, thereby improving the deformation resistance of the front riser during the press-fitting process, and significantly reducing the deformation of the front riser during the press-fitting process, so that the deformation of the front riser and the concentricity with the seat ring are not sensitive to the press-fitting speed and the press-fitting force, and there is no need to deliberately slow down the feed speed during press-fitting. At the same time, the press-fitting time and the cost of improving the control accuracy of the hydraulic press can be saved.

[0040] Exemplarily, the elastic lifting assembly 4 includes a fixed block 41, a fixed tube 42, a spring 43, a movable column 44, a movable block 45, a connecting block 46 and a lifting block 47, the fixed block 41 is installed on the base 1, the fixed tube 42 is installed on the top of the fixed block 41, the movable column 44 can be slidably inserted in the fixed tube 42, the movable block 45 is installed on the top of the movable column 44, the spring 43 is sleeved on the movable column 44 and is located between the movable block 45 and the fixed tube 42, the connecting block 46 is installed on the movable block 45, the lifting block 47 is installed on the connecting block 46, and the top of the lifting block 47 is provided There is a positioning groove 471 for positioning the frame, that is, the shape of the corresponding part of the frame and the positioning groove 471 matches the shape of the positioning groove 471. Generally, the lifting block 47 is made of nylon to prevent the frame from being damaged. After the frame is positioned and placed on the lifting frame, when the lower pressure head 3 descends to push the frame, the frame will move downward together with the lifting block 47, the connecting block and the movable block 45. At this time, the spring 43 is compressed to generate elastic force until the seat ring is pressed into the front riser. The lower pressure head 3 gradually rises, and under the elastic force of the spring 43, the lifting block 47, the connecting block and the movable block 45 gradually return to their original positions.

[0041] Exemplarily, a guide column 48 is provided on the side of the fixed block 41, and a guide groove 481 is provided along the vertical direction on the side of the guide column 48 close to the fixed block 41, and a guide block 451 is provided on the side of the movable block 45 that slides with the guide groove 481 to ensure that the movable block 45 moves vertically.

[0042] Exemplarily, the connecting block is arranged on one side of the movable block 45, and a plurality of adjusting gaskets 453 are overlapped between the connecting block and the mounting block 6. The movable block 45 is connected to the connecting block through a connecting member 452 (such as a bolt). By increasing or decreasing the number of adjusting gaskets, the position of the connecting block can be adjusted, thereby adjusting the position of the lifting block 47 to ensure that the frame can be positioned on the positioning groove 471.

[0043] Exemplarily, a mounting block 6 is provided on the base 1, and the top pressure head 2 is installed on the mounting block 6. A mounting hole 61 is provided on the top of the mounting block 6. A locking bolt 62 threadedly connected to the base 1 is inserted into the mounting hole 61. The outer diameter of the locking bolt 62 is smaller than the hole diameter of the mounting hole 61. The bolt head of the locking bolt 62 abuts against the top of the mounting block 6. A first adjusting block 7 is provided on one lateral side of the mounting block 6. The first adjusting block 7 is fixed on the base 1. A plurality of overlapping first gaskets 71 are provided between the first adjusting block 7 and the mounting block 6. The first adjusting block 7 is provided with a first gasket 71 along the longitudinal direction. A first slotted hole 72 is provided, and a first connecting bolt 73 passes through the first slotted hole 72 to be connected to the mounting block 6. It can be understood that the first gasket 71 will not affect the connection between the first connecting bolt 73 and the mounting block 6. For example, the first gasket 71 is provided with an avoidance hole for the first connecting bolt 73 to pass through. A second adjusting block 8 is provided on one longitudinal side of the mounting block 6. The second adjusting block 8 is fixed on the base 1. A plurality of overlapping second gaskets 81 are provided between the second adjusting block 8 and the mounting block 6. The second adjusting block 8 is provided with a second slotted hole 82 provided along the longitudinal direction. The second connecting bolt 8 3 passes through the second slotted hole 82 to connect with the mounting block 6, and the second gasket 81 does not affect the connection between the second connecting bolt 83 and the mounting block 6. By increasing or decreasing the number of the first gasket 71 and the second gasket 81, the mounting position of the mounting block 6 and the top pressure head 2 can be adjusted to ensure that the position of the top pressure head 2 corresponds to the position of the bottom pressure head 3. Specifically, the locking bolt 62, the first connecting bolt 73 and the second connecting bolt 83 are loosened. At this time, the bolt head of the locking bolt 62 no longer presses the top of the mounting block 6, and because the diameter of the mounting hole 61 is larger than that of the locking bolt 62, the mounting hole 61 is larger than that of the locking bolt 62. The outer diameter of the mounting block 6 is such that the mounting block 6 can be adjusted within a certain range (between the inner side of the mounting hole 61 and the outer side of the locking bolt 62). When adjusting the position of the mounting block 6, it is necessary to increase or decrease the number of the first gasket 71 or the second gasket 81 accordingly, and finally re-tighten the first connecting bolt 73, the second connecting bolt 83 and the locking bolt 62 to fix the mounting block 6. The provision of the first slotted hole 72 and the second slotted hole 82 ensures that the mounting block 6 can be normally connected to the first connecting bolt 73 and the second connecting bolt 83 after the position is adjusted.

[0044] Exemplarily, both sides of the top pressure head 2 are respectively provided with columns 11 installed on the base 1, and the columns 11 are slidably connected to the lower pressure plate 31. In this embodiment, the lower pressure plate 31 is equipped with a linear bearing that slides with the columns 11. The lower pressure head 3 is installed at the bottom of the lower pressure plate 31. The lower pressure head 3 is connected to the output end of the hydraulic press through the lower pressure plate 31 for easy assembly and connection. The column 11 is slidably connected to the lower pressure plate 31 to ensure that the lower pressure head 3 moves vertically to prevent it from shifting when pressing down.

[0045] Exemplarily, a vertically arranged limiting groove 532 is provided on the side of the upper pillar 53, and a limiting shaft 512 slidingly matched with the limiting groove 532 is fixed to the side of the sleeve 51, thereby preventing the upper pillar 53 from detaching from the top end of the sleeve 51.

[0046] Exemplarily, a limiting ring 513 is provided inside the bottom end of the sleeve 51, and the aperture of the inner ring of the limiting ring 513 is smaller than the outer diameter of the lower push column 54, thereby preventing the lower push column 54 from detaching from the bottom end of the sleeve 51, and a protruding portion 542 that slidably cooperates with the inner ring of the limiting ring 513 is provided at the bottom of the lower push column 54, and the protruding portion 542 can extend out of the bottom end of the sleeve 51 through the inner ring of the limiting ring 513 and abut against the bottom wall of the hollow groove of the front vertical pipe.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A motorcycle front riser press-fitting tool, characterized in that: The invention comprises a base, a top pressure head, a lower pressure head, an elastic lifting assembly and a supporting assembly, wherein the top pressure head is installed on the base, the lower pressure head is arranged above the top pressure head, the lower pressure head is used to be connected with the output end of the hydraulic press, the elastic lifting assembly is arranged on the base, and the elastic lifting assembly is used to support the vehicle frame, the supporting assembly comprises a sleeve, a push rod, an upper push column and a lower push column, the side of the sleeve is provided with a connecting pipe, the push rod is inserted in the connecting pipe and is threadedly connected with the connecting pipe, one end of the push rod close to the sleeve extends into the sleeve and is provided with a top push head, the top push head is tapered gradually narrowing in the direction approaching the sleeve, the upper push column and the lower push column are respectively inserted in the sleeve and slidably connected with the sleeve, the upper push column is arranged above the top push head, the bottom of the upper push column is provided with a first guide surface cooperating with the top push head, the lower push column is arranged below the top push head, and the top of the lower push column is provided with a second guide surface cooperating with the top push head.

2. The motorcycle front riser press-fitting tool according to claim 1, characterized in that: The elastic lifting assembly includes a fixed block, a fixed tube, a spring, a movable column, a movable block, a connecting block and a lifting block. The fixed block is installed on the base, the fixed tube is installed on the top of the fixed block, the movable column can be slidably inserted in the fixed tube, the movable block is installed on the top of the movable column, the spring is sleeved on the movable column and is located between the movable block and the fixed tube, the connecting block is installed on the movable block, the lifting block is installed on the connecting block, and the top of the lifting block is provided with a positioning groove for positioning the frame.

3. The motorcycle front riser press-fitting tool according to claim 2, characterized in that: A guide column is provided on the side of the fixed block, a guide groove arranged vertically is provided on one side of the guide column close to the fixed block, and a guide block slidably matched with the guide groove is provided on the side of the movable block.

4. The motorcycle front riser press-fitting tool according to claim 2, characterized in that: The connecting block is arranged at one side of the movable block, a plurality of adjusting gaskets are overlapped between the connecting block and the mounting block, and the movable block is connected to the connecting block through a connecting piece.

5. The motorcycle front riser press-fitting tool according to claim 1, characterized in that: A mounting block is provided on the base, the top pressure head is installed on the mounting block, a mounting hole is provided on the top of the mounting block, a locking bolt threadedly connected to the base is inserted in the mounting hole, the outer diameter of the locking bolt is smaller than the aperture of the mounting hole, a first adjusting block is provided on a lateral side of the mounting block, a plurality of overlapping first gaskets are provided between the first adjusting block and the mounting block, the first adjusting block is provided with a first slot hole arranged in the longitudinal direction, a first connecting bolt passes through the first slot hole and is connected to the mounting block, a second adjusting block is provided on a longitudinal side of the mounting block, a plurality of overlapping second gaskets are provided between the second adjusting block and the mounting block, the second adjusting block is provided with a second slot hole arranged in the longitudinal direction, a second connecting bolt passes through the second slot hole and is connected to the mounting block.

6. The motorcycle front riser press-fitting tool according to claim 1, characterized in that: The two sides of the top pressure head are respectively provided with columns installed on the base, the columns are slidably connected with a lower pressure plate, and the lower pressure head is installed at the bottom of the lower pressure plate.

7. The motorcycle front riser press-fitting tool according to claim 1, characterized in that: A limiting groove arranged vertically is provided on the side of the upper top column, and a limiting shaft slidingly matched with the limiting groove is fixed on the side of the sleeve.

8. The motorcycle front riser press-fitting tool according to claim 1, characterized in that: A limiting ring is arranged inside the bottom end of the sleeve, and a protruding portion which is slidably matched with the inner ring of the limiting ring is arranged at the bottom of the lower ejector column.

9. A method for pressing a motorcycle front riser using the press-fitting tool as claimed in claim 1, wherein a hollow groove is provided on the side of the front riser, characterized in that: The following steps are involved: S1: seat rings are respectively mounted on the top pressure head and the lower pressure head, and the lower pressure head is connected to the output end of the hydraulic press; S2: placing the frame on the elastic lifting assembly so that the bottom end of the front riser is aligned with the top pressure head; S3: placing the sleeve into the hollow groove, and then rotating the push rod so that the top end of the upper top column abuts against the top wall of the hollow groove, and the bottom end of the lower top column abuts against the bottom wall of the hollow groove; S4: operating the hydraulic press to gradually lower the lower pressure head until the seat ring on the lower pressure head is pressed into the top end of the front standpipe and the seat ring on the top pressure head is pressed into the bottom end of the front standpipe; S5: Operate the hydraulic press to make the upper pressure head rise and separate from the top of the front vertical pipe, then rotate the push rod to separate the top of the upper push column from the top of the hollow groove, then take the sleeve out of the hollow groove, and finally remove the frame from the elastic lifting assembly.

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