Short flat milling tool for ball valve stem

Abstract

The utility model discloses a kind of ball valve stem short flat milling tool;Belong to valve stem flat milling technical field;Its technical key points include flat-nose pliers, the flat-nose pliers is equipped with fixed clamping block, the fixed clamping block is equipped with guide rod, and respectively setting movable clamping block on the guide rod of fixed clamping block two sides;Clamping drive assembly is equipped between fixed clamping block and movable clamping block;Fixed clamping block or movable clamping block is equipped with the clamping part matched with valve stem long flat end on the positioning clamping groove matched with valve stem on the opposite side upper end of fixed clamping block and each movable clamping block;The utility model aims at providing a kind of ball valve stem short flat milling tool with simple structure, easy to operate;For ball valve stem short flat milling.

Description

Technical Field

[0001] This utility model relates to a tooling for milling flat valve stems, and more specifically, to a tooling for milling short and flat ball valve stems. Background Technology

[0002] The valve stem is one of the most important components of a valve, especially a ball valve. The valve stem is a shaft-like part, milled with long and short flat sections. The short flat section mates with the ball groove to transmit power, while the long flat section connects to the handle or drive mechanism. Both the long and short flat sections require high dimensional accuracy and strict form and position tolerances, with symmetry and perpendicularity requirements ranging from 0.05 to 0.100 mm.

[0003] In the process of machining ball valve stems, a CNC lathe milling flattening device is required. "Milling flattening" is to use a milling machine to machine two corresponding planes on a cylinder. Currently, the flattening of ball valve stems is usually done by using a conventional milling machine to clamp a workpiece individually with an indexing head. However, the drawback of the indexing head is that after one end is machined, the other end needs to be clamped again. The flatness needs to be calibrated with a dial indicator, which takes a long time. The accuracy of the dial indicator is unstable due to human factors, resulting in a low pass rate and a long processing time. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the prior art by providing a simple and easy-to-operate tooling for milling short and flat ball valve stems.

[0005] The technical solution of this utility model is implemented as follows: a ball valve stem milling short and flat tooling includes a flat-jaw vise, a fixed clamping block is provided on the flat-jaw vise, a guide rod is provided on the fixed clamping block, and movable clamping blocks are respectively provided on the guide rods on both sides of the fixed clamping block; a clamping drive assembly is provided between the fixed clamping block and the movable clamping block.

[0006] A positioning groove that mates with the valve stem is provided on the upper end of the opposite side of the fixed clamping block and each movable clamping block. A clamping part that mates with the long flat end of the valve stem is provided on the fixed clamping block or movable clamping block at the lower end of the positioning groove.

[0007] In the aforementioned ball valve stem milling short and flat tooling, the clamping drive assembly includes a limiting nut disposed at one end of the guide rod, the limiting nut cooperating with a movable clamping block on one side; a push plate is provided at the other end of the guide rod, and a cam assembly is provided between the push plate and the movable clamping block.

[0008] In the aforementioned ball valve stem milling short and flat tooling, the cam assembly includes a mounting shaft mounted on a flat-jaw vise, and a double-headed cam with protrusions at both ends is provided on the mounting shaft; a shaft retaining ring is provided between the double-headed cam and the mounting shaft, and a manual rotating handle is connected to the double-headed cam.

[0009] In the aforementioned ball valve stem milling short and flat tooling, a return spring is sleeved on the guide rod between the fixed clamping block and each movable clamping block.

[0010] After adopting the above structure, the valve stem with the long flat end is positioned by the positioning groove and then the long flat end of the valve stem is clamped by the clamping part. The end of the valve stem is adapted to the inner end of the positioning groove, which can quickly keep the valve stem in a vertical state and ensure that the length and position of the valve stem are the same each time the short flat end is processed.

[0011] Meanwhile, the movable clamping blocks and fixed clamping blocks on both sides can clamp two valve stems at once, and mill two short and flat valve stems simultaneously in one clamping, which can effectively improve processing efficiency. Attached Figure Description

[0012] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the clamping drive assembly of this utility model; Figure 3 This is a schematic diagram of the structure of the movable clamping block of this utility model.

[0014] In the diagram: 1. Flat-jaw pliers; 2. Fixed clamping block; 3. Guide rod; 4. Movable clamping block; 5. Clamping drive assembly; 5a. Limit nut; 5b. Push plate; 6. Positioning groove; 7. Clamping part; 8. Cam assembly; 8a. Mounting shaft; 8b. Double-headed cam; 8c. Shaft retaining ring; 8d. Manual handle; 9. Return spring. Detailed Implementation

[0015] See Figure 1-3 As shown, a ball valve stem milling tool of the present invention includes a flat-jaw vise 1, a fixed clamping block 2 on the flat-jaw vise 1, a guide rod 3 on the fixed clamping block 2, and movable clamping blocks 4 on the guide rods 3 on both sides of the fixed clamping block 2; a clamping drive assembly 5 is provided between the fixed clamping block 2 and the movable clamping blocks 4.

[0016] A positioning groove 6 that mates with the valve stem is provided on the upper end of the opposite side of the fixed clamping block 2 and each movable clamping block 4. A clamping part 7 that mates with the long flat end of the valve stem is provided on the fixed clamping block 2 or the movable clamping block 4 at the lower end of the positioning groove 6. After the valve stem with the long flat end is machined, it is positioned by the positioning groove and then clamped by the clamping part. The end of the valve stem is adapted to the inner end of the positioning groove, which can quickly keep the valve stem in a vertical state and ensure that the length and position of the valve stem are the same each time the short flat end is machined.

[0017] Meanwhile, the movable clamping blocks and fixed clamping blocks on both sides can clamp two valve stems at once, and mill two short and flat valve stems simultaneously in one clamping, which can effectively improve processing efficiency.

[0018] In this embodiment, the clamping drive assembly 5 includes a limiting nut 5a disposed at one end of the guide rod 3, the limiting nut 5a cooperating with a movable clamping block 4 on one side; a push plate 5b is disposed at the other end of the guide rod 3, and a cam assembly 8 is disposed between the push plate 5b and the movable clamping block 4. The cam assembly pushes the push plate and the proximal movable clamping block to both sides respectively, the proximal movable clamping block moves towards the fixed clamping block to clamp the valve stem, and the push plate drives the guide rod to move outward, so that the limiting nut pulls the distal movable clamping block towards the fixed clamping block to clamp the valve stem. Through sliding shaft and cam locking, there is little vibration, low noise, good guidance, and it is easy to install and adjust.

[0019] In this embodiment, preferably, the cam assembly 8 includes a mounting shaft 8a disposed on the flat-jaw vise 1, and a double-headed cam 8b with protrusions at both ends is provided on the mounting shaft 8a; a shaft retaining ring 8c is provided between the double-headed cam 8b and the mounting shaft 8a, and a manual rotating handle 8d is connected to the double-headed cam 8b. This cam assembly has a simple structure and is easy to operate. The double-headed cam has protrusions of 1-2mm at both ends. During clamping, rotating the manual rotating handle pushes the two movable clamping blocks to move 1-2mm, so that the positioning clamping groove and the clamping part respectively clamp the valve stem and the long flat end.

[0020] In this embodiment, a return spring 9 is sleeved on the guide rod 3 between the fixed clamping block 2 and each movable clamping block 4. While the return spring performs the reset function on the movable clamping blocks, it also acts as a buffer structure during clamping, ensuring stable and reliable clamping and preventing the workpiece from seizing.

[0021] During operation, the milled long and flat valve stem is placed in conjunction with the positioning clamping groove. The manual handle is rotated to make the double-headed cam push the push plate and the near-end movable clamping block respectively. The movable clamping blocks on both sides move synchronously toward the fixed clamping block to clamp the long and flat end of the valve stem. Then, the valve stem located on the upper side is milled short and flat by an external milling flattening device.

[0022] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. A ball valve stem short flat milling tooling comprising a flat nose pliers (1), characterized in that, The flat-nose pliers (1) are provided with a fixed clamping block (2), and a guide rod (3) is provided on the fixed clamping block (2). Movable clamping blocks (4) are respectively provided on the guide rods (3) on both sides of the fixed clamping block (2); a clamping drive assembly (5) is provided between the fixed clamping block (2) and the movable clamping block (4). A positioning groove (6) that cooperates with the valve stem is provided on the upper end of the opposite side of the fixed clamping block (2) and each movable clamping block (4). A clamping part (7) that cooperates with the long flat end of the valve stem is provided on the fixed clamping block (2) or the movable clamping block (4) at the lower end of the positioning groove (6).

2. The ball valve stem short flat milling tooling of claim 1, wherein, The clamping drive assembly (5) includes a limiting nut (5a) disposed at one end of the guide rod (3), the limiting nut (5a) cooperating with a movable clamping block (4) on one side; a push plate (5b) is provided at the other end of the guide rod (3), and a cam assembly (8) is provided between the push plate (5b) and the movable clamping block (4).

3. The ball valve stem short flat milling tooling of claim 2, wherein, The cam assembly (8) includes a mounting shaft (8a) disposed on a flat-nose pliers (1), a double-headed cam (8b) with protrusions at both ends disposed on the mounting shaft (8a); a shaft retaining ring (8c) is disposed between the double-headed cam (8b) and the mounting shaft (8a), and a manual handle (8d) is connected to the double-headed cam (8b).

4. The ball valve stem short flat milling tooling of claim 1, wherein, A reset spring (9) is sleeved on the guide rod (3) between the fixed clamping block (2) and each movable clamping block (4).

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