Clamping mechanism with adjustable machining stroke for valve tappet blank

Abstract

The utility model discloses a clamping mechanism with an adjustable processing stroke for a valve tappet blank, which relates to the technical field of processing of cup-shaped tappets of valve mechanisms of automobile engines and comprises an expansion chuck mounted on a machine tool body and used for clamping workpieces and an axis component capable of rotating and reciprocating back and forth on the machine tool body. One end of the axis assembly is in conical surface fit with the interior of the expansion chuck, and the other end of the axis assembly is further provided with an adjusting assembly for adjusting the reciprocating motion stroke of the axis assembly. Through cooperation of the expansion chuck, the axis assembly and the adjusting assembly, stroke adjustment of the pull rod of the axis assembly and opening adjustment of the expansion chuck are achieved, clamping of workpieces of different models and sizes is further achieved, operation is easy and convenient, rapid model changing can be achieved, machine adjusting efficiency is improved, and auxiliary time is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of processing cup-shaped tappets of automobile engine valve trains, in particular to a clamping mechanism with adjustable processing stroke for valve tappet blanks. Background Art

[0002] In the valve train of automobile engines, valve clearance is often adjusted to reduce valve noise and improve engine performance by reasonably selecting valve tappets of corresponding thickness. At present, the outer diameter of the cup tappet is ensured by extrusion molding, turning, heat treatment and final precision grinding, while the precision grinding of the cup tappet is to obtain the precise outer diameter through turning and grinding, so as to achieve clearance matching with the inner diameter of the engine cylinder assembly.

[0003] The existing machine tool fixtures have a fixed stroke and slow fixture change efficiency, which causes a heavy workload for the staff. At the same time, due to frequent fixture replacement, the fixtures are greatly worn out, have a short service life, and are prone to processing errors, making it impossible to guarantee product quality.

[0004] Therefore, it is now necessary to provide a clamping mechanism with adjustable valve tappet blank processing stroke, so that when turning the outer diameter of the cup-shaped tappet on an automatic lathe, the machine tool fixture stroke can be adjusted to solve the above problem. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to provide a clamping mechanism with adjustable processing stroke for valve tappet blanks, which solves the problems that the stroke of existing machine tool fixtures is fixed and the replacement of chucks is cumbersome, resulting in heavy workload for staff, low machine adjustment efficiency and long auxiliary time.

[0006] The technical solution adopted by the utility model is as follows: a clamping mechanism with adjustable processing stroke of a valve tappet blank, comprising an expansion chuck installed on a machine tool bed for clamping a workpiece, and an axis component that can rotate and reciprocate back and forth on the machine tool bed; one end of the axis component is matched with the inside of the expansion chuck in a conical surface, and the other end of the axis component is also provided with an adjustment component for adjusting the reciprocating stroke of the axis component.

[0007] Furthermore, the axis assembly includes a pull rod installed on the machine tool bed and can rotate and reciprocate back and forth. The pull rod is equipped with a spindle extending into the expansion chuck, and the extended end of the spindle is conically matched with the inner wall of the expansion chuck.

[0008] Furthermore, a spindle connecting sleeve is installed on the pull rod, and the spindle is installed on the pull rod through the spindle connecting sleeve.

[0009] Furthermore, a rotating spindle is installed on the machine tool bed, the pull rod can reciprocate but cannot rotate in the spindle, and a chuck connecting seat is installed on the spindle, a chuck is installed on the chuck connecting seat, and an expanding chuck is installed on the chuck; the axis assembly passes through the chuck connecting seat and the chuck and extends into the expanding chuck.

[0010] Furthermore, a pulley is installed on the main shaft.

[0011] Furthermore, it also includes a linear drive element for driving the pull rod to reciprocate.

[0012] Preferably, the linear drive element is a hydraulic cylinder.

[0013] Furthermore, the adjustment assembly includes a locking sleeve threadedly connected to the pull rod, the inner end of the locking sleeve abuts against the inner step of the hydraulic cylinder, and the outer wall of the locking sleeve is threadedly connected to a stroke adjustment nut.

[0014] Furthermore, a pull rod rotating nut is threadedly connected to the pull rod, and the pull rod rotating nut is located outside the locking sleeve.

[0015] Furthermore, the pull rod and the spindle are both hollow structures, and a tracheal rotating sleeve is installed at the end of the pull rod through a tracheal connecting sleeve.

[0016] Furthermore, a support sleeve for supporting the tracheal rotating sleeve is installed on the linear drive element.

[0017] Furthermore, the support sleeve is provided with a notch for facilitating the adjustment of the stroke adjustment nut and the pull rod rotating nut.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] 1. The clamping mechanism of the valve tappet blank with adjustable processing stroke realizes the stroke adjustment of the pull rod of the axis assembly and the adjustment of the opening amount of the expanding clamp through the cooperation of the expanding clamp, the axis assembly and the adjusting assembly, thereby realizing the clamping of workpieces of different models and sizes, thereby improving the adaptability and practicality of the clamping mechanism. The utility model has a simple structure and is easy to operate. It can realize rapid model change only by adjusting the stroke of the pull rod, and there is no need to replace and correct the expanding clamp every time, which greatly improves the machine adjustment efficiency, reduces the auxiliary time, and reduces the workload of the staff. At the same time, the adjustment of the opening amount of the expanding clamp, that is, the increase in speed is adjustable, so that the expanding clamp is fully utilized, which reduces the production cost and effectively avoids the problem of large fixture loss and short service life due to frequent replacement of the fixture, and also avoids the occurrence of processing errors and the impact on product quality.

[0020] 2. Driven by the linear drive element - hydraulic cylinder, the pull rod can move axially, so that the spindle and the expansion chuck can cooperate to clamp the workpiece; at the same time, the spindle is driven by installing a pulley on the spindle. The spindle rotates under the drive of the pulley, so that the chuck connecting seat, chuck, and expansion chuck rotate synchronously, and finally drive the clamped cup-type tappet to rotate for turning.

[0021] 3. The locking sleeve is fixed on the pull rod, and the distance between the stroke adjustment nut on the locking sleeve and the end face of the hydraulic cylinder is adjusted to adjust the stroke of the hydraulic cylinder, that is, the stroke adjustment of the axial movement of the pull rod; and through the cooperation of the locking sleeve and the pull rod rotating nut, the stroke adjustment of the spindle is realized, thereby changing the increase of the chuck, and finally realizing the clamping of workpieces of different models.

[0022] 4. By installing the air pipe connecting sleeve and the air pipe rotating sleeve at the end of the pull rod, the air pipe will not rotate with the spindle when the spindle rotates. After the workpiece is processed, the workpiece on the expansion chuck can be blown off by supplying compressed air to the pull rod and the spindle, so as to separate the workpiece from the expansion chuck.

[0023] 5. By installing a support sleeve on the outer shell of the hydraulic cylinder and installing bolts on the support sleeve to tighten it against the air pipe rotating sleeve, when the main shaft and the pull rod rotate, the air pipe rotating sleeve will not rotate together, but will be fixed on the outer shell of the hydraulic cylinder, further ensuring the safety and stability of the mechanism; at the same time, since a notch is provided on the support sleeve, it is convenient for the staff to turn the stroke adjustment nut and the pull rod rotating nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A structural cross-sectional view provided for an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of a three-dimensional structure provided for an embodiment of the utility model.

[0027] Description of the drawings: 1. workpiece; 2. expansion chuck; 3. spindle; 4. chuck; 5. chuck connecting seat; 6. spindle connecting sleeve; 7. pull rod; 8. machine tool bed; 9. spindle; 10. pulley; 11. hydraulic cylinder; 12. stroke adjustment nut; 13. locking sleeve; 14. pull rod rotating nut; 15. trachea connecting sleeve; 16. support sleeve; 17. trachea rotating sleeve; 18. trachea sleeve cover. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Combine the following Figure 1-Figure 2 The utility model is described in detail.

[0032] Example

[0033] Depend on Figure 1-2It can be seen that a clamping mechanism with an adjustable processing stroke for a valve tappet blank is used to clamp a valve tappet blank in a valve mechanism of an automobile engine, and the valve tappet blank is cup-shaped; at the same time, the clamping mechanism includes a chuck 2 installed on a machine tool bed 8 for clamping a workpiece 1, and an axis assembly that can rotate and reciprocate back and forth on the machine tool bed 8; one end of the axis assembly is matched with the inside of the chuck 2 in a conical surface, and the minimum diameter of the front end of the axis assembly is larger than the minimum diameter of the inner wall of the chuck 2. When the axis assembly is pushed toward the inner wall of the chuck 2, the front end of the axis assembly can expand the chuck 2 to expand the outer diameter of the chuck 2; when the axis assembly is withdrawn and the axis assembly loses the expansion of the chuck 2, the chuck 2 automatically retracts. The other end of the axis assembly is also provided with an adjustment assembly for adjusting the reciprocating stroke of the axis assembly, so as to control the length of the axis assembly extending into the expansion chuck 2, thereby controlling the expansion degree of the expansion chuck 2, which can not only achieve precise clamping of the valve tappet blank, but also achieve clamping of valve tappet blanks with different inner diameters.

[0034] Furthermore, the axis assembly includes a pull rod 7 mounted on a machine tool bed 8 and capable of rotating and reciprocating. The expansion chuck 2 is located on one side of the machine tool bed 8. A spindle 3 extending into the expansion chuck 2 is mounted on the pull rod 7, and the extended end of the spindle 3 is conically matched with the inner wall of the expansion chuck 2. A spindle connecting sleeve 6 is also mounted on the pull rod 7, and the spindle 3 is mounted on the pull rod 7 through the spindle connecting sleeve 6. Specifically, the spindle connecting sleeve 6 is threadedly connected to the spindle 3, and the spindle connecting sleeve 6 is threadedly connected to the pull rod 7, so as to facilitate the connection between the spindle 3 and the pull rod 7. Of course, if the use requirements are met, the spindle 3 and the pull rod 7 are directly connected by threads. In order to prevent the spindle 3 and the spindle connecting sleeve 6 from falling off, the tightening direction of the spindle 3 and the spindle connecting sleeve 6 is consistent with the rotation direction of the pull rod 7.

[0035] Furthermore, a rotating spindle 9 is also installed on the machine tool bed 8. The spindle 9 is tubular, and the pull rod 7 can reciprocate but cannot rotate in the spindle 9. For example, a convex key is set on the outer wall of the pull rod 7 along its axial direction, and a slide groove that slidably cooperates with the convex key is opened on the inner wall of the spindle 9. Through the cooperation of the convex key and the slide groove, the spindle 9 can drive the pull rod 7 to rotate synchronously when rotating, but when the pull rod 7 slides axially in the spindle 9, it will not drive the spindle 9 to move axially. In order to avoid wear between the spindle 9 and the machine tool bed 8 when rotating, bearings can be installed at both ends of the spindle 9, so that the spindle 9 is rotatably supported on the machine tool bed 8 through the bearings, so that the spindle 9 rotates more smoothly.

[0036] A chuck connecting seat 5 is installed on the main shaft 9, and the chuck connecting seat 5 is threadedly sleeved on the front end of the main shaft 9. A chuck 4 is installed on the chuck connecting seat 5, and the expanding chuck 2 is installed on the chuck 4; the axial component passes through the chuck connecting seat 5 and the chuck 4 and extends into the expanding chuck 2. The chuck connecting seat 5 and the chuck 4 have through holes inside, and the inner diameter of the through holes is larger than the inner diameter of the spindle 3. The spindle 3 passes through the through hole and extends into the expanding chuck 2.

[0037] In addition, a pulley 10 is installed on the main shaft 9, and the pulley 10 is connected to an external driving component through a belt, such as a motor reducer, which is a well-known technology for those skilled in the art and will not be described in detail here.

[0038] The clamping mechanism also includes a linear drive element that drives the pull rod 7 to reciprocate. The linear drive element is a hydraulic cylinder 11, which only includes a piston and a cylinder body. The cylinder body is fixed on the machine bed 8, and the rear end of the pull rod 7 extends outward through the piston and the cylinder body, and the pull rod 7 is rotatably mounted on the piston through a sealed bearing. The model of the hydraulic cylinder 11 is not specifically limited here, and it only needs to meet the actual use requirements. Of course, under the premise of satisfying the reciprocating motion of the pull rod 7, the hydraulic cylinder 11 can also be replaced by other linear drive elements such as a cylinder.

[0039] Under the back and forth push of the hydraulic cylinder 11, the taper at the front end of the spindle 3 interacts with the taper of the inner hole of the chuck 2, so that the pull rod 7 drives the spindle 3 to move forward and backward, and the clamping mouth end of the chuck 2 expands or contracts, so that the outer diameter of the clamping mouth end of the chuck 2 increases or decreases. Specifically, when the spindle 3 is pushed forward, the chuck 2 opens, and at this time the outer circle of the clamping mouth end of the chuck 2 is tightened with the inner hole of the workpiece 1, and the outer circle of the workpiece 1 can be turned by rotating the machine tool spindle 9; when the spindle 3 moves backward, the chuck 2 shrinks, and at this time the outer circle of the clamping mouth end of the chuck 2 is loosened with the inner hole of the workpiece 1, and the staff can take out the workpiece 1.

[0040] Regarding the introduction of the adjustment component, the adjustment component includes a locking sleeve 13 threadedly connected to the pull rod 7, the inner end of the locking sleeve 13 abuts against the inner step of the hydraulic cylinder 11, and the outer wall of the locking sleeve 13 is threadedly connected with a stroke adjustment nut 12. By screwing the stroke adjustment nut 12, the axial position of the stroke adjustment nut 12 on the locking sleeve 13 changes, so that the distance between the stroke adjustment nut 12 and the hydraulic cylinder 11 is adjusted.

[0041] The staff first installs the locking sleeve 13 with the stroke adjustment nut 12 onto the pull rod 7, and locks the locking sleeve 13 with the inner step of the hydraulic cylinder 11. At this time, the stroke adjustment nut 12 is turned to change the distance between the stroke adjustment nut 12 and the end face of the hydraulic cylinder 11. The distance between the two is both the stroke distance of the hydraulic cylinder 11 and the axial movement distance of the pull rod 7.

[0042] At the same time, a pull rod rotating nut 14 is threadedly connected to the pull rod 7 , and the pull rod rotating nut 14 is located outside the locking sleeve 13 .

[0043] The staff member twists the tie rod rotating nut 14 to move it toward the tracheal connection sleeve 15, and the staff member loosens the locking sleeve 13 and tightens the tie rod rotating nut 14, so that the locking sleeve 13 no longer abuts against the inner step of the hydraulic cylinder 11. When the locking sleeve 13 is loosened to the desired position, the distance between the stroke adjustment nut 12 and the hydraulic cylinder 11 is further increased, so that the axial movement distance of the tie rod 7 and the spindle 3 changes, and the axial movement distance of the spindle 3 changes. By adjusting the position of the locking sleeve 13 and the tie rod rotating nut 14 on the tie rod 7, at this time, the distance between the tie rod rotating nut 14 and the tracheal connection sleeve 15 is the axial movement distance of the spindle 3.

[0044] In addition, the pull rod 7 and the mandrel 3 are both hollow structures, and the end face of the clamping end of the expanding chuck 2 has a through hole connected to the interior of the mandrel 3. By supplying compressed air to the pull rod 7 and the mandrel 3 and blowing the compressed air out from the end face of the clamping end of the expanding chuck 2, the processed workpiece 1 can be blown off, thereby eliminating the need to manually remove the processed workpiece.

[0045] The end of the pull rod 7 is installed with a trachea rotating sleeve 17 through a trachea connecting sleeve 15. The trachea rotating sleeve 17 is a rotating joint, and a trachea sleeve cover 18 is also installed on the trachea rotating sleeve 17. The trachea sleeve cover 18 is used to fix the trachea. A support sleeve 16 for fixing the trachea rotating sleeve 17 is installed on the hydraulic cylinder 11. The support sleeve 16 is sleeve-shaped, and the inner diameter of the support sleeve 16 is larger than the outer diameter of the stroke adjustment nut 12, the locking sleeve 13, and the pull rod rotating nut 14, so that the support sleeve 16 does not hinder the rotation of the stroke adjustment nut 12, the locking sleeve 13, and the pull rod rotating nut 14, and the support sleeve 16 is fixed to the trachea rotating sleeve 17 by bolts to prevent the pull rod 7 from driving the trachea rotating sleeve 17 to rotate while rotating, thereby effectively preventing the trachea connected to the trachea rotating sleeve 17 from getting entangled when the pull rod 7 rotates.

[0046] In addition, the support sleeve 16 is provided with a notch for adjusting the stroke adjustment nut 12 and the pull rod rotating nut 14, so that the stroke adjustment nut 12, the locking sleeve 13 and the pull rod rotating nut 14 can be directly screwed from the notch when adjustment is needed.

[0047] Specifically, the installation steps are:

[0048] Step 1: Rotate and install the spindle 9 on the machine bed 8, install the pull rod 7 in the spindle 9, install the spindle 3 on the pull rod 7 through the spindle connecting sleeve 6, install the pulley 10 at the rear end of the spindle 9, and fix the cylinder body of the hydraulic cylinder 11 on the machine bed 8;

[0049] Step 2: Install the chuck connection seat 5 , the chuck 4 , and the expansion chuck 2 in sequence, and ensure that the front end of the mandrel 3 is located in the expansion chuck 2 .

[0050] Step 3: Install the locking sleeve 13 with the stroke adjustment nut 12 onto the pull rod 7. After installing it to the required position, install the pull rod rotating nut 14 onto the pull rod 7 and lock it with the locking sleeve 13.

[0051] Step 4: Install the trachea connecting sleeve 15 , the trachea rotating sleeve 17 , and the trachea sleeve cover 18 in sequence, and finally install the support sleeve 16 on the cylinder body of the hydraulic cylinder 11 , and fix the trachea rotating sleeve 17 on the support sleeve 16 .

[0052] Step 5, rotate the locking sleeve 13 so that the locking sleeve 13 is close to the inner step of the hydraulic cylinder 11, and rotate the pull rod rotating nut 14 to lock it with the locking sleeve 13; and adjust the position of the stroke adjustment nut 12 on the locking sleeve 13, that is, adjust the distance between the stroke adjustment nut 12 and the end face of the hydraulic cylinder 11, thereby adjusting the stroke distance of the hydraulic cylinder 11, and also adjusting the axial movement distance of the pull rod 7.

[0053] Step 6: Place the workpiece 1 to be processed on the expanding chuck 2, start the hydraulic cylinder 11, and the piston of the hydraulic cylinder 11 pushes the pull rod 7 forward, so that the mandrel 3 moves into the expanding chuck 2, so that the taper of the clamping end of the mandrel 3 interacts with the taper of the inner hole of the expanding chuck 2, so that the outer circle of the clamping end of the expanding chuck 2 expands, and the workpiece 1 is clamped.

[0054] Step 7. After the workpiece 1 is clamped, start the external driving component to rotate the pulley 10, thereby driving the spindle 9 and the pull rod 7 located inside the spindle 9 to rotate, thereby driving the spindle 3, the chuck connecting seat 5, the chuck 4, and the expansion chuck 2 to rotate synchronously, so that the workpiece 1 clamped on the expansion chuck 2 rotates for turning processing.

[0055] Step 8. After the workpiece 1 is processed, the spindle 9 stops rotating, and the piston of the hydraulic cylinder 11 drives the pull rod 7 to retreat, so that the mandrel 3 withdraws from the expanding chuck 2, and the expanding chuck 2 automatically shrinks; finally, the external inflation component is started to blow air into the pull rod 7 and the mandrel 3, and the compressed air blown out of the mandrel 3 is discharged through the through hole at the clamping end of the expanding chuck 2, thereby blowing the workpiece 1 off the expanding chuck 2.

[0056] When it is necessary to clamp workpieces 1 of different sizes, the pull rod rotating nut 14 is turned to move toward the trachea connecting sleeve 15, and the staff loosens the locking sleeve 13 and tightens the pull rod rotating nut 14 so that the locking sleeve 13 no longer abuts against the inner step of the hydraulic cylinder 11. At this time, the distance between the stroke adjustment nut 12 and the hydraulic cylinder 11 is further increased, so that the axial movement distance of the pull rod 7 and the spindle 3 changes, and the axial movement distance of the spindle 3 changes.

[0057] The above is only a further embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A clamping mechanism with adjustable machining stroke for valve tappet blank, characterized in that: The invention comprises an expansion chuck (2) mounted on a machine tool bed (8) for clamping a workpiece (1), and an axis component which can rotate and reciprocate on the machine tool bed (8); one end of the axis component is matched with the inside of the expansion chuck (2) in a conical surface, and the other end of the axis component is also provided with an adjustment component for adjusting the reciprocating stroke of the axis component.

2. The valve tappet blank processing stroke adjustable clamping mechanism according to claim 1, characterized in that: The axis assembly comprises a pull rod (7) mounted on a machine tool bed (8) and capable of rotating and reciprocating forward and backward. A spindle (3) extending into the expansion chuck (2) is mounted on the pull rod (7). The extended end of the spindle (3) is conically matched with the inner wall of the expansion chuck (2).

3. The valve tappet blank machining stroke adjustable clamping mechanism according to claim 2, characterized in that: A spindle connecting sleeve (6) is also installed on the pull rod (7), and the spindle (3) is installed on the pull rod (7) via the spindle connecting sleeve (6).

4. The valve tappet blank processing stroke adjustable clamping mechanism according to claim 2, characterized in that: A rotating spindle (9) is also mounted on the machine tool bed (8), and a pull rod (7) can reciprocate but cannot rotate within the spindle (9). A chuck connecting seat (5) is mounted on the spindle (9), a chuck (4) is mounted on the chuck connecting seat (5), and an expansion chuck (2) is mounted on the chuck (4); the axis assembly passes through the chuck connecting seat (5) and the chuck (4) and extends into the expansion chuck (2).

5. The valve tappet blank machining stroke adjustable clamping mechanism according to claim 4, characterized in that: A pulley (10) is also mounted on the main shaft (9).

6. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 1, characterized in that: It also includes a linear drive element for driving the pull rod (7) to reciprocate.

7. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 6, characterized in that: The linear drive element is a hydraulic cylinder (11).

8. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 7, characterized in that: The adjustment assembly comprises a locking sleeve (13) threadedly connected to the pull rod (7), the inner end of the locking sleeve (13) abuts against the inner step of the hydraulic cylinder (11), and the outer wall of the locking sleeve (13) is threadedly connected to a stroke adjustment nut (12).

9. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 8, characterized in that: The pull rod (7) is also threadedly connected with a pull rod rotating nut (14), and the pull rod rotating nut (14) is located outside the locking sleeve (13).

10. The valve tappet blank machining stroke adjustable clamping mechanism according to claim 6, characterized in that: The pull rod (7) and the spindle (3) are both hollow structures, and a tracheal rotating sleeve (17) is installed at the end of the pull rod (7) via a tracheal connecting sleeve (15).

11. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 10, characterized in that: A support sleeve (16) for supporting a tracheal rotating sleeve (17) is mounted on the linear drive element.

12. The valve tappet blank machining stroke-adjustable clamping mechanism according to claim 11, characterized in that: The support sleeve (16) is provided with a notch for facilitating the adjustment of the stroke adjustment nut (12) and the pull rod rotation nut (14).

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