An apparatus for slitting the end of an engine valve stem

Abstract

The application discloses an end slotting equipment for an engine valve rod and relates to the technical field of valve rod machining. The equipment comprises a valve rod rotating assembly which is driven to reciprocate between a feeding and clamping assembly and a cubic boron nitride grinding wheel spindle head frame assembly. The valve rod rotating assembly at least comprises three driving rollers, a driven roller and a clamping driving roller which is driven to move close to the driving roller and the driven roller. The equipment further comprises a mounting seat provided with an inclined slot. The driven roller is rotatably assembled on a bearing mounting seat which is slidably assembled in the inclined slot. The bearing mounting seat is pushed by a reset member arranged in the inclined slot so that the driving roller and the driven roller are in the same horizontal plane. The clamping driving roller is assembled to push the valve rod downward so that the driven roller moves downward along the inclined slot and gradually approaches the cubic boron nitride grinding wheel spindle head frame assembly to cut the ring groove depth. The application improves the cutting equipment for the tail of the valve rod, so that the cutting equipment has the ability of ring groove cutting.

Description

Technical Field

[0001] This invention relates to the field of valve stem processing technology, specifically to an end grooving device for engine valve stems. Background Technology

[0002] The annular groove on the valve stem is a key component for valve stem installation, and currently, valve stem annular grooves require machining using high-precision machine tools. High-precision machine tools are characterized by high procurement and maintenance costs, high levels of expertise required for repair, and high operational requirements.

[0003] The valve stem end-cutting equipment primarily functions to cut the valve stem body to the required length. Its advantages include high automation, mature technology, lower cost compared to high-precision machine tools, and easier operation. For details, refer to the invention patent application CN203579186U, published on 2014-05-07, entitled "Valve Blank Total Length Cutting Device." This device includes a base assembly and a guide rail mounted on it, a cubic boron nitride grinding wheel spindle headstock assembly, an end-face chamfering tool holder assembly, a loading and clamping assembly, and an automatic unloading assembly. It also includes a valve rotating headstock assembly and a positioning sleeve dressing tool holder assembly mounted on the guide rail. This invention adds a rotating headstock assembly and a chamfering tool holder assembly to the existing valve blank total length cutting device, enabling automatic removal of end-face burrs after the valve blank is cut to its total length, ensuring the processing quality of the subsequent rough grinding process. It also adds a positioning sleeve dressing tool holder assembly, which can be used to periodically dress the positioning sleeve to improve the positioning accuracy of the valve blank cone surface.

[0004] The aforementioned valve stem end-cutting equipment can only complete the length cutting and end face chamfering of the valve stem body, but it cannot perform annular groove machining on the valve stem body. Currently, the forming of annular grooves usually relies on high-precision CNC machine tools, but such machine tools are expensive to purchase, complex to maintain, and require strict technical skills from operators, making them unaffordable for small and medium-sized valve stem manufacturers. Although the stem end-cutting equipment itself has the characteristics of mature structure and high degree of automation, no modification scheme to enable it to perform annular groove cutting is disclosed in the existing technology, and there is a lack of technical guidance on how to integrate stem length cutting and annular groove machining at low cost. Therefore, how to give the stem end-cutting equipment the ability to perform annular groove machining while making full use of its original structural advantages and degree of automation, and simultaneously achieve integrated automatic machining of annular groove depth cutting, groove length cutting, and end chamfering, so as to significantly reduce equipment investment costs and operating thresholds, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an end slotting device for engine valve stems to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an end grooving device for an engine valve stem, comprising a feeding clamping assembly and a cubic boron nitride grinding wheel spindle headstock assembly, and further comprising a valve stem rotating assembly driven to reciprocate between the feeding clamping assembly and the cubic boron nitride grinding wheel spindle headstock assembly, which at least includes a driving roller, a driven roller, and a clamping moving roller driven to move closer to the two in a triangular arrangement of three fixed points, wherein: It also includes a second mounting seat with an inclined groove, and the passive roller is rotatably mounted on a bearing mounting seat that is slidably mounted in the inclined groove; The bearing mounting base is pushed by the reset element provided in the inclined groove so that the active roller and the passive roller are on the same horizontal plane; The clamping moving roller is assembled to push the valve stem down, causing the passive roller to move down along the inclined groove and gradually approach the cubic boron nitride grinding wheel spindle headstock assembly for annular groove depth cutting.

[0007] Preferably, the assembly also includes a clamping assembly, which includes at least a first push rod that is symmetrically distributed about the center of the valve stem rotating assembly and driven to move relative to it. The two first push rods are assembled after the annular groove depth cutting is completed, and after contacting both ends of the valve stem, they move in the same direction to perform annular groove length cutting.

[0008] Preferably, the assembly also includes a feeding assembly, which includes a second push rod that is driven to move to push the valve stem back to the feeding clamping assembly to disengage it from the valve stem rotating assembly.

[0009] Preferably, the clamping assembly includes: The guide frame, on which the first push rod is mounted to maintain axial sliding; The extension has one end fixed to the first push rod, while the other end is a horizontal part; The guide rail channel that is driven to maintain radial movement has an inclined groove that is slidably assembled with the vertical parts that are fixedly installed at the ends of the two horizontal parts. The inclined direction of the inclined groove is the cutting direction of the annular groove length.

[0010] Preferably, it also includes a powertrain, which includes a movable part that is slidably mounted in the slot, on which driven guide rollers that are rotatably disposed with respect to the horizontal plane are inclined. The driven guide roller and the passive roller are connected by a helical protrusion fixedly disposed on their outer walls. A fisheye connecting rod is provided between the moving part and the guide rail channel, and in the initial state, the fisheye connecting rod is inclined. During the cutting of the annular groove length, the passive roller drives the driven guide roller to move along the groove box guide, so that the fisheye connecting rod switches from inclined to horizontal to push the guide rail groove to move.

[0011] Preferably, the guide rod fixedly installed inside the slot passes through the slot hole opened on the moving part, and a first helical elastic element that abuts against and connects with the moving part is sleeved on the guide rod.

[0012] Preferably, the slots are waist slots distributed in a vertical direction, and in the default state, the end sidewalls of the slots distributed vertically upwards are in contact with the guide rod; The groove box is rotatably equipped with rotating rollers located at the moving end position of the moving part. When the cutting of the annular groove length is about to be completed, the rotating rollers move upward due to the rolling connection with the moving part, causing the driven guide roller to lift the passive roller and move the valve stem away from the cubic boron nitride grinding wheel spindle headstock assembly.

[0013] Preferably, the slot box is located close to and fixedly installed on the cubic boron nitride grinding wheel spindle headstock assembly, and the passive roller moves down under the push of the clamping moving roller to engage with the rotating roller.

[0014] Preferably, the valve stem rotation assembly includes a second cylinder, the output end of which is slidably fitted with a first mounting seat for rotating the clamping roller, and a second helical elastic element is fitted between the two.

[0015] Preferably, a bullseye bearing is fixedly installed at the end of the first push rod.

[0016] In the above technical solution, the end grooving device for engine valve stems provided by the present invention has the following beneficial effects: the loading and clamping assembly discharges the valve stems one by one into the gap between the active roller and the passive roller, and then completes the loading operation of the valve stems in the valve stem rotating assembly. Subsequently, the valve stem rotating assembly moves to the cubic boron nitride grinding wheel spindle head assembly. At this time, the clamping active roller extends down and approaches the valve stem and applies pressure, causing the passive roller to move down along the inclined groove to the termination position. At this time, the valve stem contacts the boron nitride grinding wheel on the boron nitride grinding wheel spindle head assembly, thereby completing the annular groove depth cutting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the valve stem rotation assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the clamping assembly and valve stem rotation assembly provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the powertrain and driven roller provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the powertrain provided in an embodiment of the present invention; Figure 6 Provided for embodiments of the present invention Figure 5 A schematic diagram of the planar structure; Figure 7 A schematic diagram of the moving part, the fisheye connecting rod, and the guide rail channel provided in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the movement of the moving part and the guide rail channel provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of the guide rail channel provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the annular groove provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the clamping assembly provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Feeding and clamping assembly; 3. Valve stem rotation assembly; 31. Driven roller; 32. Driven roller; 33. Clamping roller; 34. Second cylinder; 35. First mounting base; 36. Second helical elastic element; 4. Cubic boron nitride grinding wheel spindle headstock assembly; 5. Second mounting base; 51. Inclined groove; 52. Bearing mounting base; 6. Clamping assembly; 61. First push rod; 62. Guide frame; 63. Extension; 631. Horizontal section; 63 2. Vertical section; 64. Guide rail groove; 7. Power assembly; 71. Slot box; 72. Moving section; 721. Driven guide roller; 73. Fish eye connecting rod; 74. Guide rod; 75. First spiral elastic element; 76. Rotating roller; 8. Feeding assembly; 81. Second push rod; 82. Third cylinder; 9. Stepper motor; 100. Vertical plate; 400. Spiral protrusion; 500. Vertical groove; 501. First inclined groove; 502. Second inclined groove. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1-11This invention provides a technical solution: an end grooving device for engine valve stems, comprising a loading and clamping assembly 1 and a cubic boron nitride grinding wheel spindle headstock assembly 4, and a valve stem rotating assembly 3 driven to reciprocate between the loading and clamping assembly 1 and the cubic boron nitride grinding wheel spindle headstock assembly 4, which at least includes a driving roller 31, a driven roller 32, and a clamping moving roller 33 driven to move closer to the two in a triangular arrangement of three fixed points, wherein: It also includes a second mounting seat 5 with an inclined groove 51, and the passive roller 32 is rotatably mounted on a bearing mounting seat 52 that is slidably mounted in the inclined groove 51. The bearing mounting seat 52 is pushed by the reset element provided in the inclined groove 51 so that the driving roller 31 and the passive roller 32 are on the same horizontal plane; The clamping roller 33 is assembled to push the valve stem down so that the passive roller 32 moves down along the inclined groove 51 and gradually approaches the cubic boron nitride grinding wheel spindle headstock assembly 4 to perform annular groove depth cutting.

[0022] Specifically, the feeding and clamping assembly 1 provided in the above embodiment is mounted on a rectangular bracket, on which a worktable is fixedly mounted. The cubic boron nitride grinding wheel spindle headstock assembly 4 and the moving mechanism are mounted on the worktable. The moving mechanism can be a cylinder, a lead screw, or a complete module, such as a stepper lead screw slide module. The valve stem rotation assembly 3 in the embodiment is mounted on the platform driven to move by the aforementioned moving mechanism.

[0023] Furthermore, a stepper motor 9 is fixedly installed on the platform. Its output end can be directly connected to the end of the drive roller 31 or connected via a belt drive. (Detailed details to follow.) Figure 6 It can also be known.

[0024] Furthermore, the reset component in the above embodiments can be an elastic metal plate or an equidistant spring, and the cross-section of the spring is rectangular, as detailed in the following embodiments. Figure 6 It can also be known.

[0025] Furthermore, in the above embodiment, the active roller 31 is mounted via a bearing housing located on the platform.

[0026] The workbench or platform is fixedly equipped with a vertical plate 100, combined with Figure 1 and Figure 2 It is known that a second cylinder 34 is fixedly mounted on the upright plate 100 at an incline, and a first mounting base 35 is fixedly mounted on the output end of the second cylinder 34. The clamping moving roller 33 is rotatably mounted on the first mounting base 35. The inclination direction of the second cylinder 34 is such that the downward-moving clamping moving roller 33 is positioned at the gap between the active roller 31 and the passive roller 32 on the same plane, so as to contact the valve stem.

[0027] When the stepper motor 9 is in a stopped state, during the annular groove depth cutting, the clamping roller 33 moves down to contact the valve stem, at which point the stepper motor 9 starts running, causing the driving roller 31 to drive the valve stem to rotate at high speed. As the clamping roller 33 continues to move down, it applies pressure to the valve stem, causing the driven roller 32 to move down along the inclined groove 51. During this process, the distance between the driving roller 31 and the driven roller 32 increases, but the increase is limited to the depth of the annular groove. Because the clamping roller 33 is moved down by the push of the second cylinder 34, the outer surface of the valve stem contacts the cubic boron nitride grinding wheel during the downward movement, and the depth increases with continued downward movement.

[0028] In addition, the torque and speed output by the stepper motor 9 are less than the rotational speed of the cubic boron nitride grinding wheel.

[0029] The cubic boron nitride grinding wheel spindle headstock assembly 4 consists of a three-phase asynchronous motor and a cubic boron nitride grinding wheel mounted on the output end of the three-phase asynchronous motor; The loading and clamping assembly 1 is composed of an integrally formed slide rail, which is divided into an inclined section and a vertical section according to its structure. There is a piston pin controlled by air pressure between the inclined section and the vertical section, which is used to intercept the valve stem on the inclined section, so that only one valve stem enters the vertical section during processing and falls into the valve stem rotating assembly 3.

[0030] The cubic boron nitride grinding wheel spindle headstock assembly 4 and the loading clamping assembly 1 mentioned above are existing technologies and will not be disclosed in detail here.

[0031] As a further embodiment of the present invention, combined with Figure 3 As shown, after the valve stem rotating assembly 3 moves to the cubic boron nitride grinding wheel spindle headstock assembly 4 and completes the annular groove depth cutting, it is necessary to cut the annular groove length, which requires the valve stem to move axially during rotation. To achieve this, this embodiment provides a clamping assembly 6, which includes at least first push rods 61 that are symmetrically distributed about the center of the valve stem rotating assembly 3 and driven to move relative to the valve stem rotating assembly 3. The two first push rods 61 are assembled after the annular groove depth cutting is completed, and after contacting both ends of the valve stem, they move in the same direction to perform the annular groove length cutting.

[0032] Specifically, in this embodiment, a bullseye bearing is fixedly mounted at the end of the first push rod 61. This is to ensure that the balls on the bullseye bearing, after contacting the valve stem ends, rotate synchronously with it, thereby reducing resistance after contact. The mechanism driving the first push rod 61 can be a cylinder, a motor-driven lead screw, or any drive mechanism known to those skilled in the art. After the annular groove depth is cut, the two first push rods 61 are driven to approach each other, causing the bullseye bearing to contact the valve stem, and then the two first push rods 61 move synchronously, thus completing the annular groove length cutting.

[0033] It should be noted that the reason for performing annular groove length cutting is that, under the cutting operation environment, the thickness of the blade must be less than the annular groove length, which is common technical knowledge in this field.

[0034] Based on the above embodiments, the present invention further provides another embodiment, wherein the clamping assembly 6 includes: The guide frame 62, and the first push rod 61 are mounted on the guide frame 62 to maintain axial sliding; The extension 63 has one end fixed to the first push rod 61, while the other end is a horizontal part 631; The guide rail channel 64, which is driven to maintain radial movement, has an inclined groove on it that is slidably assembled with the vertical part 632 that is fixedly installed at the ends of the two horizontal parts 631. The inclined direction of the sloping groove is the cutting direction of the annular groove length.

[0035] Specifically, the guide frame 62 is fixedly installed on the workbench, and the tail end of the first push rod 61 is a rectangular rod, which slides into the rectangular groove on the guide frame 62, thereby allowing the first push rod 61 to move in a guided manner.

[0036] Furthermore, the extension 63 is slidably installed inside the groove on the worktable, and a mounting plate for suspension by diagonally distributed columns is provided on the bottom of the worktable, on the side opposite to where the valve stem rotating assembly 3 is installed, and the horizontal part 631 is also slidably installed on this mounting plate. The guide rail channel 64 is slidably installed in the rail provided on the mounting plate by a frame-mounting method, and the vertical part 632 is slidably installed in the inclined groove of the guide rail channel 64.

[0037] It should be noted that ball bearings are fixedly installed in the inclined groove or on the vertical part 632 so that the contact between the two is rolling friction. The movement of the drive guide groove 64 can be achieved by a cylinder or a lead screw, or other drive methods known to those skilled in the art.

[0038] Inclined groove ( Figure 9As shown, the structure is divided into a vertical groove 500, a first inclined groove 501, and a second inclined groove 502. The two first inclined grooves 501 are arranged in a frustum shape. The end of the first inclined groove 501 corresponding to the wide end of the frustum shape is connected to the vertical groove 500, while the end of the first inclined groove 501 corresponding to the narrow end of the frustum shape is connected to the second inclined groove 502. Figure 10 As shown. During operation, after the annular groove depth is cut, the guide rail channel 64 is driven along... Figure 6 The vertical part 632 moves from the vertical groove 500 into the first inclined groove 501, and as the ends of the two first inclined grooves 501 approach each other, the two first push rods 61 approach each other, thus abutting against the two ends of the valve stem. Then the vertical part 632 enters the second inclined groove 502 from the first inclined groove 501, and along the direction of the second inclined groove 502, the two first push rods 61 move synchronously, thus completing the annular groove length cutting. Subsequently, the clamping moving roller 33 returns to its initial position, that is, away from the driving roller 31 and the driven roller 32, and at this time the platform moves, so that the valve stem rotating assembly 3 moves away from the cubic boron nitride grinding wheel spindle headstock assembly 4, and at the same time the stepper motor 9 stops running.

[0039] Based on the above embodiments, the present invention further provides another embodiment, which also includes a powertrain 7, which includes a movable part 72 slidably assembled in a slot box 71, and a driven guide roller 721 rotatably disposed on the movable part 72 with respect to the horizontal plane. The driven guide roller 721 and the passive roller 32 are connected by meshing through spiral protrusions 400 fixedly disposed on their outer walls; A fisheye connecting rod 73 is provided between the moving part 72 and the guide rail channel 64, and in the initial state, the fisheye connecting rod 73 is inclined. During the cutting of the annular groove length, the passive roller 32 rotates and generates axial thrust through the spiral protrusion 400, driving the driven guide roller 721 to move along the groove box 71, so that the fisheye connecting rod 73 switches from inclined to horizontal to push the guide rail groove 64 to move.

[0040] Specifically, in combination Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, the spiral protrusions 400 are made of hard rubber material. The distribution and design of the spiral protrusions 400 are sufficient to ensure that the driven guide roller 721 and the driven roller 32 are in... Figure 4 The meshing engagement is formed as shown. This is because, in the initial state, the fisheye connecting rod 73 is inclined. And in the initial state, the driven guide roller 721 is in... Figure 4As shown, after the clamping roller 33 pushes the driven roller 32 to the predetermined position, i.e., after the annular groove depth cutting is performed, the rotation of the driven roller 32 drives the driven guide roller 721 to rotate via the helical protrusion 400 and move it along its own axial direction. As the driven guide roller 721 is driven by the driven roller 32 and thus displaced, it moves along the guide box 71. During the movement, the inclined fisheye connecting rods 73 tend to be horizontal, thereby driving the drive guide rail groove 64 along the groove. Figure 6 The vertical part 632 moves in the direction shown. As it moves from the vertical groove 500 into the first inclined groove 501, the ends of the two first inclined grooves 501 approach each other, causing the two first push rods 61 to approach each other and abut against the two ends of the valve stem. Then, the vertical part 632 moves from the first inclined groove 501 into the second inclined groove 502. Along the direction of the second inclined groove 502, the two first push rods 61 move synchronously, thus completing the annular groove length cutting. Subsequently, the clamping moving roller 33 returns to its initial position, i.e., away from the driving roller 31 and the driven roller 32. At this time, the platform moves, causing the valve stem rotating assembly 3 to move away from the cubic boron nitride grinding wheel spindle headstock assembly 4, and at the same time, the stepper motor 9 stops running.

[0041] Based on the above embodiments, the present invention further provides another embodiment in which a guide rod 74 fixedly installed in the slot box 71 passes through a slot hole opened in the moving part 72, and a first spiral elastic member 75 is sleeved on the guide rod 74 and abuts against and connects with the moving part 72.

[0042] Specifically, as the driven guide roller 721 is driven by the passive roller 32 and thus displaced, it moves along the groove box 71. At this time, the first helical elastic element 75 (which is an equidistant spring with a rectangular cross-section) is compressed and deformed.

[0043] When the clamping roller 33 returns to its initial position, i.e., away from the driving roller 31 and the driven roller 32, the driven roller 32 separates from the driven guide roller 721, and the first helical elastic element 75 is released and instantly reset, thereby causing the driven guide roller 721 to return to its original position. Figure 4 At the same time, the two first push rods 61 will also reset.

[0044] Based on the above embodiments, the present invention further provides another embodiment, wherein the slot is a waist slot distributed in a vertical direction, and in its default state, the end sidewall of the slot distributed vertically upward is in contact with the guide rod 74; A rotating roller 76 is rotatably disposed inside the slot box 71 and distributed at the moving end position of the moving part 72. When the cutting of the annular groove length is about to be completed, the rotating roller 76 rolls with the moving part 72, causing the moving part 72 to move upward, which causes the driven guide roller 721 to lift the passive roller 32 and move the valve stem away from the cubic boron nitride grinding wheel spindle headstock assembly 4.

[0045] Specifically, in the above embodiments, the position Figure 4 In this state, the guide rod 74 contacts the end sidewalls distributed vertically upwards in the slot. When the guide rail groove 64 is about to reach its end along the end of the second inclined groove 502, the moving part 72 will contact the rotating roller 76, thereby causing the moving part 72 to move vertically upwards. Simultaneously, the driven guide roller 721 lifts the passive roller 32, moving the valve stem away from the cubic boron nitride grinding wheel spindle headstock assembly 4, thereby causing the annular groove end face to move upwards, forming a chamfer, such as Figure 9 As shown.

[0046] It should be noted that the valve stem rotation assembly 3 in the above embodiment includes a second cylinder 34, the output end of which is slidably fitted with a first mounting base 35 for rotatably mounting and clamping the moving roller 33, and a second helical elastic element 36 (an equidistant spring with a rectangular cross-section) is fitted between the two. That is, when the driven guide roller 721 lifts the driven roller 32 to move the valve stem upward, the second helical elastic element 36 will be compressed and undergo appropriate deformation.

[0047] Furthermore, in combination Figure 4 As shown, the slot box 71 is fixedly installed near the cubic boron nitride grinding wheel spindle headstock assembly 4, and the driven roller 32 moves downward under the push of the clamping moving roller 33 to engage with the driven guide roller 721. Here, the slot box 71 is mounted on the worktable by a screw.

[0048] As another embodiment further provided by the present invention, combined with Figure 3 As shown, this embodiment also includes a feeding assembly 8, which includes a second push rod 81 that is driven to move and push the valve stem back to the feeding clamping assembly 1 to disengage from the valve stem rotating assembly 3.

[0049] Specifically, after the valve stem completes the cutting of the annular groove, the stepper motor 9 stops working and returns to the bottom of the loading and clamping assembly 1. At this time, the third cylinder 82 pushes the second push rod 81, thereby causing the valve stem to disengage from the valve stem rotating assembly 3 and perform the unloading operation. Then the loading and clamping assembly 1 releases the material again.

[0050] The second helical elastic element 36 mentioned above is an equidistant spring with a rectangular cross-section.

[0051] It should be noted that the connection between the various actions in the above embodiments (such as when the valve stem completes the cutting of the annular groove, the stepper motor 9 stops working and then returns to the bottom of the loading and clamping assembly 1, etc.) needs to be realized by sensors or industrial cameras. The sensors can be common infrared sensors. Their detailed circuit design and control program language are common technical knowledge known to those skilled in the art, so they will not be described in detail.

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An end grooving device for engine valve stems, comprising a loading and clamping assembly (1) and a cubic boron nitride grinding wheel spindle headstock assembly (4), characterized in that, It also includes a valve stem rotation assembly (3) that is driven to reciprocate between the loading clamping assembly (1) and the cubic boron nitride grinding wheel spindle headstock assembly (4), which includes at least three fixed-point distributions of a driving roller (31), a driven roller (32), and a clamping moving roller (33) driven to move closer to the two, wherein: It also includes a second mounting seat (5) with an inclined groove (51) on it, and the passive roller (32) is rotatably mounted on a bearing mounting seat (52) that is slidably mounted in the inclined groove (51); The bearing mounting base (52) is pushed by the reset member provided in the inclined groove (51) so that the active roller (31) and the passive roller (32) are on the same horizontal plane; The clamping moving roller (33) is assembled to push the valve stem down to make the passive roller (32) move down along the inclined groove (51) and gradually approach the cubic boron nitride grinding wheel spindle headstock assembly (4) to perform annular groove depth cutting.

2. The end slotting device for an engine valve stem according to claim 1, characterized in that, It also includes a clamping assembly (6), which includes at least a first push rod (61) that is symmetrically distributed about the center of the valve stem rotation assembly (3) and driven to move relative to it. The two first push rods (61) are assembled after the annular groove depth cutting is completed, and after contacting both ends of the valve stem, they move in the same direction to perform annular groove length cutting.

3. The end slotting device for an engine valve stem according to claim 2, characterized in that, It also includes a feeding assembly (8), which includes a second push rod (81) for being driven to push the valve stem back to the feeding clamping assembly (1) to disengage from the valve stem rotating assembly (3).

4. The end grooving device for an engine valve stem according to claim 2, characterized in that, The clamping assembly (6) includes: The guide frame (62) is on which the first push rod (61) is mounted to maintain axial sliding; The extension (63) has one end fixed to the first push rod (61) and the other end is a horizontal part (631). The guide rail channel (64) that is driven to maintain radial movement has an inclined groove that is slidably assembled with the vertical part (632) that is fixedly installed at the ends of the two horizontal parts (631); The inclined direction of the inclined groove is the cutting direction of the annular groove length.

5. The end grooving device for an engine valve stem according to claim 4, characterized in that, It also includes a powertrain (7), which includes a movable part (72) that is slidably mounted in a slot (71) and on which driven guide rollers (721) are rotatably disposed with respect to the horizontal plane. The driven guide roller (721) and the passive roller (32) are engaged and connected by spiral protrusions (400) fixedly disposed on their outer walls; A fisheye connecting rod (73) is provided between the moving part (72) and the guide rail channel (64), and in the initial state, the fisheye connecting rod (73) is inclined. During the cutting of the annular groove length, the passive roller (32) drives the driven guide roller (721) to move along the groove box (71) so that the fisheye connecting rod (73) switches from inclined to horizontal to push the guide rail groove (64) to move.

6. The end slotting device for an engine valve stem according to claim 5, characterized in that, The guide rod (74) fixedly installed inside the slot (71) passes through the slot hole opened on the moving part (72), and a first helical elastic element (75) is sleeved on the guide rod (74) and abuts against the moving part (72).

7. The end grooving device for an engine valve stem according to claim 6, characterized in that, The slot is a waist slot distributed in the vertical direction. In its default state, the end sidewalls of the slot distributed vertically upward are in contact with the guide rod (74). The groove box (71) is rotatably provided with a rotating roller (76) located at the moving end position of the moving part (72). When the cutting of the annular groove length is about to be completed, the rotating roller (76) moves upward due to the rolling connection with the moving part (72), causing the driven guide roller (721) to lift the passive roller (32) and move the valve stem away from the cubic boron nitride grinding wheel spindle headstock assembly (4).

8. The end slotting device for an engine valve stem according to claim 7, characterized in that, The slot box (71) is located close to the cubic boron nitride grinding wheel spindle head assembly (4) and is fixedly installed thereon. Under the push of the clamping moving roller (33), the passive roller (32) moves down to engage with the rotating roller (76).

9. The end grooving device for an engine valve stem according to claim 1, characterized in that, The valve stem rotation assembly (3) includes a second cylinder (34), the output end of which is slidably fitted with a first mounting base (35) for rotatingly mounting the clamping roller (33), and a second helical elastic element (36) is fitted between the two.

10. The end grooving device for an engine valve stem according to claim 4, characterized in that, A bullseye bearing is fixedly installed at the end of the first push rod (61).

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