Valve oil seal press fitting machine

Abstract

The present application relates to valve oil seal press equipment technical field, specifically disclose a kind of valve oil seal press machine, including base, base is slidably provided with the mounting seat that can be front and back overturned, engine cylinder cover is set on mounting seat;Pressing member includes drive plate and pressure head, drive plate is vertically slidably set above mounting seat, drive plate is provided with several slide seats that can slide left and right, slide seat is vertically provided with pressure head;Variable distance piece includes variable distance plate and variable distance rod, variable distance plate is vertically slidably set on drive plate, variable distance plate is provided with several groups of guide holes, a group of guide holes includes two mutually symmetrical and obliquely arranged guide long holes;One slide seat is fixedly provided with a variable distance rod, drive plate is provided with several through holes at intervals, variable distance rod is provided with through hole and guide long hole.The problems, such as it is difficult for traditional valve oil seal press machine to realize a device compatible with multiple models of valve oil seal assembly and some micro deformation but do not affect use of valve oil seal are easily installed failure, are solved.

Description

Technical Field

[0001] This invention relates to the field of valve stem seal press-fitting equipment, and more specifically, to a valve stem seal press-fitting machine. Background Technology

[0002] Engine valve stem seals, installed inside the engine cylinder head, are used to seal the gap between the valve stem and the valve guide. This prevents engine oil from entering the intake and exhaust pipes, thus avoiding oil loss; ensures stable pressure inside the engine cylinders; prevents leakage of the gasoline-air mixture and exhaust gases; prevents engine oil from entering the combustion chamber; reduces carbon deposit formation; maintains normal engine operation; and prevents unnecessary energy loss, thus improving fuel economy.

[0003] The most common method for pressing valve stem seals into engine cylinder heads is using a valve stem seal press-fitting machine, which can install 4 or 8 valve stem seals at a time. However, this type of equipment is specialized and is mostly designed for pressing into a specific type of engine cylinder head. For engines of different displacements within the same series, the spacing and position of the intake or exhaust valve guides in the same cylinder vary. Therefore, traditional valve stem seal press-fitting machines struggle to achieve compatibility with multiple engine models. Furthermore, valve stem seals may have manufacturing errors or slight deformations during transport and storage. While these deformations are corrected by the valve guide head after installation into the engine cylinder head and do not affect the performance after valve stem installation, the edges of these seals may protrude from the valve guide head, making it difficult for traditional equipment to directly press them into the valve stem. In some cases, this can even damage the valve stem seal, leading to press-fit failure. Summary of the Invention

[0004] The purpose of this invention is to provide a valve stem seal press-fitting machine, which solves the problems of traditional valve stem seal press-fitting machines, such as the difficulty in achieving compatibility of valve stem seal fitting for multiple engine models with a single machine, and the easy failure to install valve stem seals with slight deformation that do not affect their use.

[0005] This invention is achieved through the following technical solution: a valve stem seal press-fitting machine for press-fitting valve stem seals onto an engine cylinder head, comprising a base, wherein a mounting seat that can be flipped back and forth is slidably disposed on the base, and the engine cylinder head is disposed on the mounting seat;

[0006] A press-fitting component, comprising a drive plate and a press head, wherein the drive plate is vertically slidably disposed above the mounting base, and the drive plate is provided with a plurality of slide blocks that can slide left and right, and the press head is vertically disposed on the slide blocks;

[0007] The pitch control component includes a pitch control plate and a pitch control rod. The pitch control plate is vertically slidable on the drive plate. The pitch control plate is provided with a plurality of guide holes. Each set of guide holes includes two mutually symmetrical elongated guide holes. The elongated guide holes are inclined.

[0008] A variable pitch rod is fixedly installed on the slide block. A plurality of through holes are spaced apart on the drive plate. The diameter of the through holes is not less than the distance between the upper and lower ends of the guide elongated hole. The variable pitch rod passes through the through holes and the guide elongated hole.

[0009] Furthermore, the press-fit component also includes a press rod, a drive hole is vertically provided on the slide, the press rod slides through the drive hole, a limit cap is provided at the upper end of the press rod, the limit cap is located above the slide, and the press head is provided at the lower end of the press rod;

[0010] The outer wall of the pressure rod is provided with a spiral guide groove, and the slide is provided with a guide key, which is slidably placed in the guide groove.

[0011] Furthermore, the pressure rod is also provided with a limiting seat and a spring, with the upper and lower ends of the spring abutting against the slide and the limiting seat, respectively.

[0012] Furthermore, it also includes a compensation tube and a pressure sensor, both of which are slidably sleeved on the pressure rod. The upper and lower ends of the pressure sensor abut against the compensation tube and the limiting seat, respectively, and the upper end of the compensation tube abuts against the lower end of the spring.

[0013] Furthermore, the lower end of the pressure head is configured as a multi-stage frustum, and the valve oil seal is mounted on one of the stages of the frustum.

[0014] Furthermore, the base is provided with two first slide rails along the front-to-back direction, and a mounting base plate is slidably mounted on the two first slide rails;

[0015] The base is also provided with a first push cylinder, the telescopic end of which is connected to the mounting base plate.

[0016] Furthermore, the mounting base plate is provided with two hinge seats at intervals, and the mounting seat is hinged to the two hinge seats;

[0017] It also includes a second push cylinder, the two ends of which are respectively hinged to one end of the mounting base plate and the mounting seat;

[0018] A servo motor is also provided on the hinge base, and the output end of the servo motor is coaxially connected to the rotating shaft of the mounting base.

[0019] Furthermore, a support seat is vertically arranged on the base, a cantilever is arranged on the support seat, and two second slide rails are vertically arranged on the support seat, and the drive plate is slidably arranged on the two second slide rails;

[0020] A third push cylinder is provided on the cantilever, and the telescopic end of the third push cylinder is connected to the drive plate.

[0021] Furthermore, the drive plate is vertically arranged, and two parallel third slide rails are vertically spaced on the front side plate of the drive plate. Several slide blocks in odd-numbered positions are slidably arranged on one of the third slide rails, and several slide blocks in even-numbered positions are slidably arranged on the other third slide rail.

[0022] The rear side panel of the drive plate is provided with two fourth slide rails, and the variable pitch plate is slidably mounted on the two fourth slide rails; the drive plate is also provided with a fourth push cylinder, and the telescopic end of the fourth push cylinder is connected to the variable pitch plate.

[0023] Furthermore, a pulley is rotatably mounted on the pitch rod, and the pulley is rolled within the guide elongated hole.

[0024] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0025] 1. The first push cylinder drives the mounting base plate to slide back and forth on the base, which in turn moves the engine cylinder head back and forth. The second push cylinder controls the mounting seat to flip on the two hinge seats, which in turn drives the engine cylinder head on the mounting seat to flip back and forth. This allows for the adjustment of different engine cylinder heads so that the corresponding multiple air intake or exhaust ports are in a vertical position and located directly below the pressure head.

[0026] 2. The fourth push cylinder drives the pitch plate to move up and down on the rear side of the drive plate, which in turn drives the guide hole to move vertically. Since the pitch rod can move left and right with the slide on the drive plate, the part of the pitch rod located in the guide hole is driven by the guide hole, causing the slide to slide on the third slide rail. The same set of guide holes can control the corresponding two slides to move away from each other or closer to each other, which can control the distance between the two intake or exhaust ports on the same cylinder, so that the pressure head is coaxial with the valve guide below. With the third push cylinder driving the entire drive plate to press down, the valve oil seal press-fitting operation of different models of engine cylinders can be realized.

[0027] 3. After the initial adjustment of the mounting bracket's tilt angle by the second push cylinder, fine adjustments can be made by the servo motor. Furthermore, the servo motor's self-locking mechanism prevents the engine cylinder head from tilting during press-fitting, thus ensuring the valve guide head's positional accuracy and stability.

[0028] 4. When the pressure head, carrying the valve stem seal, aligns with the valve guide head, a spring prevents excessive pressure from damaging the valve stem seal. However, if the valve stem seal is slightly deformed and difficult to press directly into the valve guide head, the pressure head, carrying the valve stem seal, will be stuck in the orifice of the valve guide head. As the slide continues to move downwards, it compresses the spring and moves downwards relative to the pressure rod, sliding in the guide groove via the guide key. This causes the pressure rod to rotate, and as the pressure rod rotates, it causes the pressure head below to rotate around its axis, thus rotating the valve stem seal. The undeformed portion of the valve stem seal first enters the valve guide head. As the valve stem seal rotates and is pressed downwards, the entire valve stem seal is eventually screwed into the valve guide head. This method can also be used to install valve stem seals with large interference fits and no deformation.

[0029] 5. A pressure sensor monitors the spring pressure, which in turn monitors the pressure acting on the valve stem seals. This can be used to determine whether the valve stem seals are installed correctly. When the slide moves downwards, all valve stem seals smoothly enter, and the pressure change is within the preset range. When a valve stem seal is stuck at the valve guide head, the pressure on the valve stem seal will increase as the spring is compressed. If subsequent valve stem seals are screwed into the valve guide head, the installation is successful. If the pressure consistently exceeds the threshold when pressed down to the predetermined position, the installation fails, and an alarm is triggered to notify the personnel, requiring manual re-installation at that location. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A three-dimensional structural diagram of a valve stem seal press-fitting machine provided by the present invention;

[0032] Figure 2 A three-dimensional structural diagram of a mounting base and a base in a valve stem seal press-fitting machine provided by the present invention;

[0033] Figure 3 A schematic diagram of the back structure of the valve stem seal press-fitting component and the press-fitting component in a valve stem seal press-fitting machine, provided by the present invention;

[0034] Figure 4 This invention provides a schematic diagram of the structure of the valve stem and the fitting component in a valve stem seal press-fitting machine.

[0035] Icons: 1. Base, 11. First slide rail, 12. Mounting base plate, 13. First push cylinder, 14. Support seat, 15. Cantilever, 2. Mounting seat, 21. Hinge seat, 22. Second push cylinder, 23. Servo motor, 3. Drive plate, 31. Through hole, 32. Second slide rail, 33. Third push cylinder, 4. Pressure head, 5. Slide seat, 51. Drive hole, 52. Third slide rail, 6. Pitch plate, 61. Pitch rod, 62. Guide elongated hole, 63. Fourth slide rail, 64. Fourth push cylinder, 65. Pulley, 7. Pressure rod, 71. Limit cap, 72. Guide groove, 73. Guide key, 74. Limit seat, 75. Spring, 76. Compensation tube, 77. Pressure sensor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] Reference Figures 1 to 4 As shown, this embodiment provides a valve stem seal press-fitting machine for press-fitting valve stem seals onto engine cylinder heads. It includes a base 1, on which a mounting seat 2 that can be flipped back and forth is slidably disposed, and the engine cylinder head is disposed on the mounting seat 2.

[0039] In specific implementation, such as Figure 1 and 2 As shown, two first slide rails 11 are provided on the base 1 along the front-back direction, and mounting base plates 12 are slidably provided on the two first slide rails 11; a first push cylinder 13 is also provided on the base 1, and the telescopic end of the first push cylinder 13 is connected to the mounting base plate 12, thereby driving the mounting base plate 12 to slide back and forth on the base 1 through the first push cylinder 13, so as to realize the valve oil seal press-fitting operation of multiple cylinders on the front and rear sides of the engine cylinder head.

[0040] At the same time, such as Figure 2As shown, two hinge seats 21 are spaced apart on the mounting base plate 12, and mounting seats 2 are hinged to the two hinge seats 21; it also includes a second push cylinder 22, the two ends of which are respectively hinged to one end of the mounting base plate 12 and one end of the mounting seat 2; the second push cylinder 22 controls the mounting seat 2 to flip on the two hinge seats 21, thereby driving the engine cylinder head on the mounting seat 2 to flip back and forth, mainly used for pressing valve oil seals on the intake and exhaust valves on the front and rear sides of multiple cylinders on the same side.

[0041] More specifically, a servo motor 23 is also provided on the hinge 21. The output end of the servo motor 23 is coaxially connected to the rotating shaft of the mounting base 2. After the initial adjustment of the rotation angle of the mounting base 2 by the second push cylinder 22, fine adjustments can be made by the servo motor 23. Furthermore, the self-locking of the servo motor 23 can prevent the engine cylinder head from flipping during the press-fitting operation, thus preventing the valve guide from becoming misaligned and ensuring the positional accuracy and stability of the valve guide.

[0042] like Figure 1 , 3 As shown in Figure 4, it also includes a pressing component, which includes a drive plate 3 and a pressing head 4. The drive plate 3 is vertically slidably mounted above the mounting base 2. In a specific implementation, a support base 14 is vertically mounted on the base 1, and a cantilever 15 is mounted on the support base 14. Two second slide rails 32 are vertically mounted on the support base 14, and the drive plate 3 is slidably mounted on the two second slide rails 32. A third push cylinder 33 is mounted on the cantilever 15. The telescopic end of the third push cylinder 33 is connected to the telescopic drive plate 3, and the drive plate 3 is driven to move up and down on the second slide rails 32 by the third push cylinder 33.

[0043] like Figure 1 and 4 As shown, the drive plate 3 is provided with several sliding blocks 5 that can slide left and right. Each sliding block 5 has a pressure head 4 vertically mounted on it. In specific implementation, the drive plate 3 is vertically mounted, and two parallel third slide rails 52 are vertically spaced on the front side plate of the drive plate 3. Several sliding blocks 5 in odd-numbered positions are slidably mounted on one of the third slide rails 52, and several sliding blocks 5 in even-numbered positions are slidably mounted on the other third slide rail 52. The sliding heads on the two third slide rails 52 are independent of each other and do not interfere with each other. The separate mounting also allows the pressure heads 4 on two adjacent sliding blocks 5 to be closer or farther apart while ensuring the structural strength of the sliding blocks 5. Pressing operations can be performed when the distance between two intake valves or two exhaust valves on the same cylinder is large or small, thereby meeting the actual use needs.

[0044] More specifically, such as Figure 4As shown, the lower end of the pressure head 4 is set in a multi-stage frustum shape, and the valve oil seal is fitted on one of the frustums. The pressure head 4 presents a multi-stage frustum shape, which can fit valve oil seals of various sizes. The pressure head 4 can also be replaced for valve oil seal pressing operations at the valves of different models of cylinder heads.

[0045] like Figure 1 and 4 As shown, the press-fit component also includes a press rod 7. A drive hole 51 is vertically provided on the slide block 5. The press rod 7 slides through the drive hole 51. A limit cap 71 is provided at the upper end of the press rod 7. The limit cap 71 is located above the slide block 5 and is mainly used to prevent the press rod 7 from falling off. The press head 4 is provided at the lower end of the press rod 7. A spiral guide groove 72 is provided on the outer wall of the press rod 7. A guide key 73 is provided on the slide block 5. The guide key 73 is slidably placed in the guide groove 72. In specific implementation, the third push cylinder 33 drives the drive plate 3 to move downward, thereby driving several slide blocks 5 to move downward. The pressure rod 7 is also equipped with a limit seat 74. The upper and lower ends of the spring 75 abut against the slide block 5 and the limit seat 74 respectively. Under the action of gravity, when the slide block 5 moves downward, the pressure rod 7 and the pressure head 4 move downward. After the valve oil seal on the pressure head 4 abuts against the valve guide head, the drive plate 3 continues to be pressed down. Then the slide block 5 acts on the limit seat 74 through the spring 75 and then on the pressure head 4. The valve oil seal on the pressure head 4 is driven by a larger first-stage truncated cone above the truncated cone to enter the corresponding valve guide head on the cylinder head. Multiple valve oil seals in the same row can be pressed at the same time.

[0046] After installing multiple front valve stem seals on the same exhaust cylinder, the mounting base 2 is slightly tilted back and forth, so that the valve guide head of the valve stem seal to be installed is in a vertical position. Combined with the first push cylinder 13 pushing the mounting base plate 12 to move back and forth on the base 1, so that the valve guide is coaxial with the corresponding pressure head 4. Continue to install multiple rear valve stem seals on the same exhaust cylinder. At the same time, the front and rear valve stem seals on another exhaust cylinder can be press-fitted in the same way.

[0047] like Figure 4As shown, when the pressure head 4, carrying the valve stem seal, aligns with the valve guide head, the spring 75 prevents excessive pressure from damaging the valve stem seal. However, if the valve stem seal is slightly deformed and difficult to press directly into the valve guide head, the pressure head 4, carrying the valve stem seal, will be stuck at the opening of the valve guide head. At this time, as the slide 5 continues to move downward, it compresses the spring 75. Simultaneously, the slide 5 moves downward relative to the pressure rod 7, sliding within the guide groove 72 via the guide key 73, thereby driving the pressure rod 7 to rotate. During the rotation of the pressure rod 7, the pressure head 4 below rotates around its axis, thus causing the valve stem seal to rotate. The undeformed portion of the valve stem seal first enters the valve guide head. As the valve stem seal rotates and is pressed downward, the entire valve stem seal is finally screwed into the valve guide head. This method can also be used to install valve stem seals with large interference fits and no deformation. Since the valve stem seal is soaked in engine oil for at least 10 minutes before installation, there is no concern about wear when rotating the valve stem seal.

[0048] like Figure 1 and 4 As shown, it also includes a compensation tube 76 and a pressure sensor 77. Both the pressure sensor 77 and the compensation tube 76 are slidably sleeved on the pressure rod 7. The upper and lower ends of the pressure sensor 77 abut against the compensation tube 76 and the limiting seat 74, respectively. The upper end of the compensation tube 76 abuts against the lower end of the spring 75. In practice, since several slide blocks 5 are distributed on two third slide rails 52 of unequal heights, and the springs 75 are of the same size, the height of the pressure head 4 also needs to be consistent. Therefore, the compensation tube 76 is needed to compensate for the position height to ensure that the height of the pressure head 4 is consistent. At the same time, the elastic force of the spring 75 is also consistent. The pressure of the spring 75 is monitored by the pressure sensor 77, which in turn monitors the pressure acting on the valve stem seal. This can be used to determine whether the valve stem seal is installed correctly. For example, when the slide block 5 moves downward and several valve stem seals enter smoothly, the pressure change is within the preset range. When the valve stem seal is stuck at the opening of the valve guide head, the pressure on the valve stem seal will increase as the spring 75 is compressed. If the valve stem seal is subsequently screwed into the valve guide head, it means that the installation is successful. If the pressure always exceeds the threshold when it is pressed down to the predetermined position, it means that the installation has failed. An alarm will be triggered to notify the staff, and manual re-installation is required.

[0049] More specifically, such as Figure 1 , 3As shown in Figure 4, it also includes a pitch-changing component, which includes a pitch-changing plate 6 and a pitch-changing rod 61. The pitch-changing plate 6 is vertically slidably mounted on the drive plate 3. The pitch-changing plate 6 is provided with several sets of guide holes. Each set of guide holes includes two mutually symmetrical guide elongated holes 62. The guide elongated holes 62 are inclined, and the two guide elongated holes 62 in the same set are in a figure-eight shape. A pitch-changing rod 61 is fixedly mounted on a slide block 5. Several through holes 31 are provided at intervals on the drive plate 3. The diameter of the through holes 31 is not less than the distance between the upper and lower ends of the guide elongated holes 62. The pitch-changing rod 61 passes through the through holes 31 and the guide elongated holes 62.

[0050] In specific implementation, such as Figure 3 As shown, two fourth slide rails 63 are vertically arranged on the rear side panel of the drive plate 3, and the pitch plate 6 is slidably mounted on the two fourth slide rails 63. The drive plate 3 is also equipped with a fourth push cylinder 64, the telescopic end of which is connected to the pitch plate 6. The fourth push cylinder 64 drives the pitch plate 6 to move up and down on the rear side of the drive plate 3, thereby driving the guide elongated hole 62 to move vertically. Since the pitch rod 61 can move left and right on the drive plate 3 with the slide block 5, the part of the pitch rod 61 located in the guide elongated hole 62 is driven by the guide elongated hole 62, causing the slide block 5 to slide on the third slide rail 52. The same set of guide elongated holes 62 can control the corresponding two slide blocks 5 to move away from or closer to each other, thereby controlling the distance between the two air inlet or outlet holes on the same cylinder. With the third push cylinder 33 driving the entire drive plate 3 to press down, the valve oil seal press-fit operation of different models of engine cylinders can be realized.

[0051] More specifically, such as Figure 3 As shown, a pulley 65 is rotatably mounted on the pitch rod 61. The pulley 65 is rolled within the guide elongated hole 62. The pulley 65 can reduce the friction force when driving the pitch rod 61, thereby avoiding damage to the pitch rod 61, and at the same time, it facilitates the adjustment of the horizontal position of the slide block 5.

[0052] Meanwhile, a QR code can be set on the cylinder head, and a lens can be set on the cantilever 15 to automatically identify the cylinder head type and select the program. After the cylinder head is fixed on the mounting seat 2, the pressure head 4 can automatically align with the corresponding valve guide, which improves the installation efficiency and saves manpower.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve stem seal press-fitting machine, used for press-fitting valve stem seals onto engine cylinder heads, characterized in that: Includes a base (1), on which a mounting seat (2) that can be flipped back and forth is slidably disposed, and the engine cylinder head is disposed on the mounting seat (2); The pressing component includes a drive plate (3) and a pressing head (4). The drive plate (3) is vertically slidably disposed above the mounting base (2). The drive plate (3) is provided with several sliding blocks (5) that can slide left and right. The pressing head (4) is vertically disposed on the sliding blocks (5). The pressing component also includes a pressing rod (7). The sliding blocks (5) are vertically provided with a drive hole (51). The pressing rod (7) slides through the drive hole (51). The upper end of the pressing rod (7) is provided with a limit cap (71). The limit cap (71) is located above the sliding blocks (5). The pressing head (4) is disposed at the lower end of the pressing rod (7). The outer wall of the pressing rod (7) is provided with a spiral guide groove (72). The sliding blocks (5) are provided with a guide key (73). The guide key (73) slides in the guide groove (72). The pressing rod (7) is also provided with a limit... The seat (74) and spring (75) are respectively connected to the slide (5) and the limit seat (74) at the upper and lower ends of the spring (75); when the pressure head (4) docks with the valve oil seal and the valve guide head, the spring (75) prevents the valve oil seal from being damaged by excessive pressure. When the valve oil seal is deformed, the pressure head (4) and the valve oil seal are stuck at the opening of the valve guide head. At this time, the slide (5) continues to move downward, compressing the spring (75). At the same time, the slide (5) moves downward relative to the pressure rod (7) and slides in the guide groove (72) through the guide key (73), thereby driving the pressure rod (7) to rotate. During the rotation of the pressure rod (7), the pressure head (4) below rotates around its axis, thereby causing the valve oil seal to rotate. The part of the valve oil seal that is not deformed first enters the valve guide head. As the valve oil seal rotates and is pressed downward, the entire valve oil seal is finally screwed into the valve guide head. The pitch control component includes a pitch control plate (6) and a pitch control rod (61). The pitch control plate (6) is vertically slidably mounted on the drive plate (3). The pitch control plate (6) is provided with a number of guide holes. One set of guide holes includes two mutually symmetrical guide elongated holes (62). The guide elongated holes (62) are inclined. A variable pitch rod (61) is fixedly installed on the slide (5), and a plurality of through holes (31) are provided on the drive plate (3) at intervals. The diameter of the through holes (31) is not less than the distance between the upper and lower ends of the guide elongated hole (62). The variable pitch rod (61) passes through the through holes (31) and the guide elongated hole (62).

2. The valve stem seal press-fitting machine according to claim 1, characterized in that, It also includes a compensation tube (76) and a pressure sensor (77). The pressure sensor (77) and the compensation tube (76) are slidably sleeved on the pressure rod (7). The upper and lower ends of the pressure sensor (77) abut against the compensation tube (76) and the limiting seat (74) respectively. The upper end of the compensation tube (76) abuts against the lower end of the spring (75).

3. A valve stem seal press-fitting machine according to claim 1 or 2, characterized in that, The lower end of the pressure head (4) is configured as a multi-stage frustum, and the valve oil seal is mounted on one of the frustum stages.

4. A valve stem seal press-fitting machine according to claim 3, characterized in that, The base (1) is provided with two first slide rails (11) along the front-back direction, and a mounting base plate (12) is slidably provided on the two first slide rails (11). The base (1) is also provided with a first push cylinder (13), and the telescopic end of the first push cylinder (13) is connected to the mounting base plate (12).

5. A valve stem seal press-fitting machine according to claim 4, characterized in that, The mounting base plate (12) is provided with two hinge seats (21) spaced apart, and the mounting seat (2) is hinged to the two hinge seats (21). It also includes a second push cylinder (22), the two ends of which are respectively hinged to one end of the mounting base plate (12) and the mounting seat (2); A servo motor (23) is also provided on the hinge (21), and the output end of the servo motor (23) is coaxially connected to the shaft of the mounting base (2).

6. A valve stem seal press-fitting machine according to claim 3, characterized in that, A support seat (14) is vertically arranged on the base (1), a cantilever (15) is arranged on the support seat (14), and two second slide rails (32) are vertically arranged on the support seat (14). The drive plate (3) is slidably arranged on the two second slide rails (32). A third push cylinder (33) is provided on the cantilever (15), and the telescopic end of the third push cylinder (33) is connected to the drive plate (3).

7. A valve stem seal press-fitting machine according to claim 6, characterized in that, The drive plate (3) is vertically arranged, and two parallel third slide rails (52) are vertically spaced on the front side plate of the drive plate (3). Several slide blocks (5) in odd positions are slidably arranged on one of the third slide rails (52), and several slide blocks (5) in even positions are slidably arranged on the other third slide rail (52). Two fourth slide rails (63) are vertically arranged on the rear side panel of the drive plate (3), and the variable pitch plate (6) is slidably arranged on the two fourth slide rails (63); a fourth push cylinder (64) is also provided on the drive plate (3), and the telescopic end of the fourth push cylinder (64) is connected to the variable pitch plate (6).

8. A valve stem seal press-fitting machine according to claim 7, characterized in that, A pulley (65) is rotatably mounted on the pitch rod (61), and the pulley (65) is rolled within the guide elongated hole (62).

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