Clamping fixture for machining diesel engine needle valves

Abstract

This utility model relates to the field of clamping fixture technology, and more particularly to a clamping fixture for machining diesel engine needle valves. The technical solution includes a base, on the upper surface of which two sets of support rods are fixedly mounted. A top plate is fixedly mounted on the upper end of each support rod. A threaded rod is threaded through the top plate, with a handwheel fixedly mounted on the upper end of the threaded rod and a pressing component for limiting the diesel engine needle valve at the lower end. An adjusting component for limiting the diesel engine needle valve is located between the support rods. This utility model can weaken rigid impact forces, thereby avoiding deformation, indentation, breakage, or damage to the needle valve due to excessive clamping force, and reducing the scrap rate.

Description

Technical Field

[0001] This utility model relates to the field of clamping tooling technology, and in particular to clamping tooling used for machining diesel engine needle valves. Background Technology

[0002] In the fuel injection system of a diesel engine, the needle valve is a core component for achieving precise fuel metering and atomized injection. Because needle valves are typically made of high-strength alloy materials and feature a slender rod-like structure, a precisely fitted conical surface, and a small orifice, they require clamping fixtures for fixation during grinding, polishing, and drilling to ensure machining quality. Existing clamping fixtures for diesel engine needle valve machining usually employ rigid clamping structures to limit and fix the needle valve, lacking effective buffering structures. This makes it difficult to accurately control the force, easily leading to excessive pressure. Since the diesel engine needle valve itself has a delicate structure and relatively fragile material, it is easily deformed, indented, or even broken or damaged under excessive rigid clamping force. This not only affects the machining quality of the needle valve but also increases production costs and scrap rates. Therefore, this utility model proposes a clamping fixture for diesel engine needle valve machining. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies that use rigid clamping structures to limit and fix needle valves, lacking effective buffering structures, making it difficult to accurately control the force and easily leading to excessive pressure. Furthermore, diesel engine needle valves themselves have a precise structure and relatively fragile materials; under excessive rigid clamping force, they are prone to deformation, indentation, or even breakage or damage. This not only affects the machining quality of the needle valve but also increases production costs and scrap rates. Therefore, this invention proposes a clamping fixture for machining diesel engine needle valves.

[0004] The technical solution of this utility model is as follows: a clamping fixture for machining a diesel engine needle valve, comprising: a base, two sets of support rods fixedly disposed on the upper surface of the base, a top plate fixedly disposed on the upper end of the support rods; a threaded rod threaded through the top plate, a handwheel fixedly disposed on the upper end of the threaded rod, and a pressing component for limiting the diesel engine needle valve disposed on the lower end of the threaded rod; and an adjusting component for limiting the diesel engine needle valve disposed between the support rods.

[0005] Optionally, the pressing assembly includes a movable sleeve that is movably fitted onto the outer wall of the support rod, and a pressing plate is fixedly disposed between the movable sleeves. The pressing plate is rotatably connected to the threaded rod.

[0006] Optionally, the adjusting assembly includes movable sleeve blocks that are movably fitted onto the outer wall of the support rod, connecting blocks that are fixedly disposed between the movable sleeve blocks, a guide rod that is fixedly disposed between the connecting blocks, sleeve blocks that are movably fitted onto the outer wall of the guide rod, clamping blocks that are fixedly disposed between the sleeve blocks, and an adjusting screw that is rotatably disposed on one side of the clamping block, the adjusting screw being threadedly connected to the connecting block.

[0007] Optionally, a fixing plate is fixedly sleeved on the outer wall of the support rod, and a screw is threaded through the fixing plate. An adjusting disc is fixedly connected to the lower end of the screw, and a sleeve plate is rotatably connected to the upper end of the screw. The sleeve plate is movably sleeved with the support rod.

[0008] Optionally, springs are respectively sleeved on the support rods, with the upper end of the springs fixedly connected to the movable sleeve block and the lower end of the springs fixedly connected to the sleeve plate.

[0009] Optionally, limit sleeves are fixedly sleeved on the support rods.

[0010] Optionally, the upper surface of the base is provided with a groove, and the adjustment disc is located in the groove.

[0011] Optionally, a protective pressure block is fixedly provided on the bottom surface of the lower pressure plate.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] This utility model, by adjusting the combination of guide rod, sleeve block and clamping block in the assembly, can precisely control the clamping force by adjusting the screw. At the same time, the buffering effect of the spring weakens the rigid impact force, thereby avoiding deformation, indentation, breakage or damage to the needle valve due to excessive clamping force, and reducing the scrap rate.

[0014] Furthermore, this utility model utilizes a threaded rod and handwheel in conjunction with a movable sleeve and a lower pressure plate in the pressing assembly. Rotating the handwheel drives the threaded rod to rotate, and the threaded rod drives the lower pressure plate to apply pressure to the diesel engine needle valve. This allows for slow adjustment of the clamping pressure, ensuring stable positioning of the needle valve during processing and effectively preventing damage to the needle valve caused by sudden or excessive pressure increases, thereby improving the controllability and safety of the clamping operation. Attached Figure Description

[0015] Figure 1 A schematic diagram of the clamping fixture used for machining diesel engine needle valves;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the mid-to-low voltage component;

[0017] Figure 3 for Figure 1 A schematic diagram of the structure of the adjustment component.

[0018] Figure label:

[0019] 1. Base; 2. Support rod; 3. Top plate; 4. Threaded rod; 5. Handwheel;

[0020] 6. Pressing assembly; 61. Movable sleeve; 62. Pressing plate;

[0021] 7. Adjusting component; 71. Movable sleeve; 72. Connecting block; 73. Guide rod; 74. Sleeve; 75. Clamping block; 76. Adjusting screw;

[0022] 8. Fixing plate; 9. Screw; 10. Adjusting plate; 11. Sleeve plate; 12. Spring; 13. Limiting sleeve; 14. Groove; 15. Protective pressure block. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example

[0029] like Figure 1 As shown, the clamping fixture for processing diesel engine needle valves proposed in this utility model includes: a base 1, a groove 14 on the upper surface of the base 1, two sets of support rods 2 fixedly installed on the upper surface of the base 1, and the support rods 2 are symmetrically arranged. Limiting sleeves 13 are fixedly sleeved on the support rods 2 respectively, and the limiting sleeves 13 can limit the movable sleeve 71. A top plate 3 is fixedly installed at the upper end of the support rod 2, which can provide stable support for the top plate 3.

[0030] Furthermore, a threaded rod 4 is threaded through the top plate 3, and a handwheel 5 is fixedly installed at the upper end of the threaded rod 4, which can drive the threaded rod 4 to rotate on the top plate 3.

[0031] like Figure 1 and Figure 2 As shown, the lower end of the threaded rod 4 is provided with a pressing assembly 6 for limiting the position of the diesel engine needle valve. The pressing assembly 6 includes a movable sleeve 61 that is movably sleeved on the outer wall of the support rod 2. A pressing plate 62 is fixedly arranged between the movable sleeves 61, which can guide the movable sleeves 61 to the pressing plate 62. The pressing plate 62 is rotatably connected to the threaded rod 4 through a bearing, thereby driving the pressing plate 62 to move stably. A protective pressure block 15 is fixedly arranged on the bottom surface of the pressing plate 62. The protective pressure block 15 is made of rubber, which can provide protection when contacting the upper end of the needle valve and avoid friction.

[0032] like Figure 1 and Figure 3As shown, an adjustment assembly 7 for limiting the position of the diesel engine needle valve is provided between the support rods 2. The adjustment assembly 7 includes movable sleeves 71 that are movably sleeved on the outer wall of the support rods 2. A connecting block 72 is fixedly provided between the movable sleeves 71, which can guide the movable sleeves 71 to the connecting block 72 and make them move stably. A guide rod 73 is fixedly provided between the connecting blocks 72. A sleeve block 74 is movably sleeved on the outer wall of the guide rod 73. The sleeve block 74 can move stably in the direction of the guide rod 73. A clamping block 75 is fixedly provided between the sleeves 74. The clamping block 75 is arc-shaped and can fit against the lower end of the needle valve to avoid friction. An adjustment screw 76 is rotatably provided on one side of the clamping block 75. The adjustment screw 76 is threadedly connected to the connecting block 72 and can adjust the distance between the clamping blocks 75 to ensure stable clamping and fixing of needle valves of different diameters.

[0033] Furthermore, a fixing plate 8 is fixedly sleeved on the outer wall of the support rod 2. A screw 9 is threaded through the fixing plate 8, and an adjusting plate 10 is fixedly connected to the lower end of the screw 9. The adjusting plate 10 can drive the screw 9 to rotate stably on the fixing plate 8. The adjusting plate 10 is located in the groove 14 for easy rotation. A sleeve plate 11 is rotatably connected to the upper end of the screw 9. The sleeve plate 11 is movably sleeved with the support rod 2. The screw 9 can drive the sleeve plate 11 to move stably on the support rod 2, thereby adjusting the pressure applied by the sleeve plate 11 to the spring 12. Springs 12 are respectively sleeved on the support rod 2. The upper end of the spring 12 is fixedly connected to the movable sleeve block 71, and the lower end of the spring 12 is fixedly connected to the sleeve plate 11. This can provide a buffering force for the clamping block 75 and prevent the needle valve from being damaged by excessive clamping pressure.

[0034] The working principle of this embodiment is as follows: First, the adjusting screw 76 is manually rotated according to the thickness of the diesel engine needle valve. Since the adjusting screw 76 is threadedly connected to the connecting block 72, its rotation will drive the sleeve block 74 to slide smoothly along the guide rod 73. The sleeve block 74 drives the clamping block 75 to move relatively horizontally, so that the lower end of the diesel engine needle valve can be inserted between the clamping blocks 75.

[0035] Subsequently, since the lower end of the diesel engine needle valve is conical, it is inserted between the clamping blocks 75. Manually rotating the handwheel 5 causes the threaded rod 4 to rotate on the top plate 3. The lower end of the threaded rod 4 is rotatably connected to the lower pressure plate 62, which is sleeved on the support rod 2 via a movable sleeve 61. Therefore, the rotation of the threaded rod 4 is converted into the downward movement of the lower pressure plate 62. As the lower pressure plate 62 gradually approaches the needle valve, the rotation speed of the handwheel 5 can be slowly adjusted to gradually increase the pressure applied to the needle valve by the lower pressure plate 62. The lower end of the needle valve applies pressure to the clamping blocks 75, which move vertically downwards through the sleeve block 74, guide rod 73, connecting block 72, and movable sleeve block 71. The movable sleeve block 71 moves vertically downwards on the outer wall of the support rod 2, causing it to compress the spring 12, thus providing a buffer for the needle valve and preventing damage from excessive pressure.

[0036] When adjusting the buffering force of spring 12, manually rotate the adjusting disc 10. The adjusting disc 10 drives the screw 9 to rotate on the fixed plate 8. Since the screw 9 is threadedly connected to the fixed plate 8, the fixed plate 8 drives the sleeve 11 to move up and down along the support rod 2, so that the sleeve 11 provides pressure to the spring 12, thereby adjusting the extension and retraction length of the spring 12 and ensuring that the buffering force of the spring 12 remains appropriate.

[0037] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A clamping tool for machining of a needle valve of a diesel engine, characterized in that include: The base (1) has two sets of support rods (2) fixedly installed on its upper surface, and a top plate (3) is fixedly installed at the upper end of the support rods (2). A threaded rod (4) is threaded through the top plate (3). A handwheel (5) is fixedly installed at the upper end of the threaded rod (4), and a pressing assembly (6) for limiting the diesel engine needle valve is installed at the lower end of the threaded rod (4). An adjustment assembly (7) for limiting the position of the diesel engine needle valve is provided between the support rods (2).

2. The clamping fixture for machining of diesel needle valve as claimed in claim 1 wherein, The pressing assembly (6) includes a movable sleeve (61) that is movably sleeved on the outer wall of the support rod (2), and a pressing plate (62) is fixedly arranged between the movable sleeves (61). The pressing plate (62) is rotatably connected to the threaded rod (4).

3. The clamping fixture for machining of diesel needle valve as claimed in claim 2 wherein, The adjustment assembly (7) includes movable sleeve blocks (71) that are movably sleeved on the outer wall of the support rod (2). Connecting blocks (72) are fixedly arranged between the movable sleeve blocks (71). Guide rods (73) are fixedly arranged between the connecting blocks (72). Sleeve blocks (74) are movably sleeved on the outer wall of the guide rod (73). Clamping blocks (75) are fixedly arranged between the sleeve blocks (74). An adjusting screw (76) is rotatably arranged on one side of the clamping block (75). The adjusting screw (76) is threadedly connected to the connecting block (72).

4. The clamping fixture for machining of diesel needle valve as claimed in claim 1 wherein, A fixing plate (8) is fixedly sleeved on the outer wall of the support rod (2). A screw (9) is threaded through the fixing plate (8). An adjusting plate (10) is fixedly connected to the lower end of the screw (9). A sleeve plate (11) is rotatably connected to the upper end of the screw (9). The sleeve plate (11) is movably sleeved with the support rod (2).

5. The clamping fixture for machining a diesel engine needle valve according to claim 3, characterized in that, Springs (12) are respectively sleeved on the support rod (2). The upper end of the spring (12) is fixedly connected to the movable sleeve block (71), and the lower end of the spring (12) is fixedly connected to the sleeve plate (11).

6. The clamping fixture for machining of diesel needle valve as claimed in claim 1 wherein, Limiting sleeves (13) are fixedly sleeved on the support rod (2).

7. The clamping fixture for machining of diesel needle valve as claimed in claim 4 wherein, The upper surface of the base (1) is provided with a groove (14), and the adjustment plate (10) is located in the groove (14).

8. The clamping fixture for machining of diesel needle valve as claimed in claim 3 wherein, A protective pressure block (15) is fixedly installed on the bottom surface of the lower pressure plate (62).

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