Tooling fixtures for machining ball valves

Abstract

This tooling fixture for machining ball valves includes two pressure plates in the clamping mechanism that fix two sides of the valve body respectively. A handle is provided on the lead screw on the pressure plate surface. The flipping mechanism includes a slider and fixed plates on both sides of the valve body. A long groove runs through the vertical fixed plate, and slide rails are provided on both sides of the groove. A slider is fitted onto the lead screw, and a thin block that matches the slide rail is provided on the outer wall of the slider. A flipping groove is also provided on the long groove. The slider moves along the slide rail to the flipping groove via the thin block, and the lead screw is driven to rotate circumferentially by the handle. After completion, it returns to its original position. This invention achieves fixation by inserting the pressure plates into the through holes on both sides of the valve body, allowing for accurate and rapid positioning of the reference surface during the clamping stage, thus improving clamping speed. The flipping mechanism, using the lead screws on both sides of the clamping mechanism as pivots, enables the machining of features on different planes of the same circumference of the valve.

Description

Technical Field

[0001] This invention relates to auxiliary equipment for machining multi-plane mechanical parts with center positioning, specifically a tooling fixture for machining ball valves. Background Technology

[0002] A ball valve is a valve that rotates around an axis, allowing it to cut off, regulate, distribute, and change the direction of media flow in pipelines. The ball valve body has two main structural features: it has numerous machined surfaces, with the structures on the non-rotating surfaces (inner bore, bevel, arc) relatively concentrated; and these machined surfaces are sequentially developed based on the positioning point at the center of the ball.

[0003] Currently, the common method for machining ball valve bodies is to cut and heat-forge round steel into a solid spherical blank, and then machine it using a five-axis machine tool. However, when manufacturing valve bodies on CNC lathes, multiple clamping operations are required to machine multiple different structures on the same circumference. This repeated clamping and disassembly is not only cumbersome and labor-intensive, but also prone to positioning errors and affecting the machining accuracy of radial parts. Furthermore, most valve bodies require specialized fixtures, which have low versatility and high costs. Summary of the Invention

[0004] In order to improve the processing efficiency and positioning accuracy of valve bodies and reduce production costs, this invention aims to provide a tooling fixture for processing ball valves.

[0005] To achieve the above objectives, the technical solution adopted in this invention includes a valve body whose lower end is fixed to a disc, comprising a clamping mechanism and a flipping mechanism; wherein: the clamping mechanism includes a pressure plate and a lead screw, with the two pressure plates respectively fixing the two sides of the valve body; a horizontal lead screw is provided on the surface of the pressure plate, and a handle for driving circumferential rotation is provided on the lead screw;

[0006] The flipping mechanism includes a slider and fixed plates on both sides of the valve body. The vertical fixed plate has a long groove that runs through its surface, and the two side walls of the long groove are provided with slide rails. The lead screw passes through the long groove and is connected to the pressure plate. A slider is sleeved on the lead screw, and the outer wall of the slider is provided with a thin block that matches the slide rail.

[0007] The long groove is also equipped with a flipping groove for the slider to rotate circumferentially; the slider moves along the slide rail via a thin block into the flipping groove, and is driven by a handle to rotate the lead screw circumferentially; after flipping, it returns to its original position along the slide rail. The valve body has through holes on both sides, into which a pressure plate of corresponding size is inserted to fix the valve body. The edges of the pressure plate are chamfered.

[0008] The pressure plate has a circular tube perpendicular to the plate surface at its center, and the circular tube has an internal thread; the pressure plate is fixedly connected to the lead screw through the internal thread.

[0009] The handle is located at the end of the lead screw facing away from the valve body.

[0010] The long groove is straight and extends vertically; the thin block is arranged radially along the screw and is square or regular polygonal; the two sides of the square block are respectively placed in the slide rails on both sides of the long groove and move along the slide rails.

[0011] The flipping groove is circular, and its diameter is greater than the diagonal length of the thin block.

[0012] The fixing plate is formed by fitting a front plate and a rear plate together; each edge of the fitting area between the front plate and the rear plate has a rectangular groove; the two grooves together form a slide rail after fitting.

[0013] It also includes a pressing mechanism, including a pressure plate and a locking bolt. The pressing part of the pressure plate can extend into the long groove and limit the upper end face of the slider. The pressure plate has a pressing through hole, and the locking bolt passes through the pressing through hole and is fixedly connected to the flower plate.

[0014] It also includes a fixing ring, a support spring, and a guide rod. The guide rod is slidably connected to the pressure plate through a linear bearing. The upper end of the guide rod is provided with a convex ring to prevent it from falling downwards, and the lower end of the guide rod is provided with a fixing ring. The support spring is in a compressed state, with its upper end pressing against the lower end face of the pressure plate and its lower end connected to the fixing ring.

[0015] The clamping part is located in the middle of the pressure plate, and the two sides of the pressure plate are respectively provided with the aforementioned fixing ring, linear bearing, support spring and guide rod.

[0016] The lower end of the valve body is fixed to the faceplate via a positioning mandrel, and the lower end of the positioning mandrel is detachably connected to the faceplate, which serves as a lathe connecting component.

[0017] Compared with the prior art, the present invention achieves fixation by inserting the pressure plate into the through holes on both sides of the valve body, which can accurately and quickly position the reference surface during the clamping stage, thus improving the clamping speed; the two lead screws on both sides of the clamping mechanism are used as the pivot for rotation, which can realize the feature processing of different surfaces on the same circumference of the valve body, and also protect the processed surfaces.

[0018] This invention uses a sliding block, a sliding rail, and a flipping groove to form a flipping mechanism. During the process of changing different surfaces, it is no longer necessary to replace the pressure plate for secondary clamping, which reduces the steps of repositioning the reference surface. When processing different surfaces, single clamping can reduce positioning errors and avoid the generation of secondary errors. The conversion process is easy to operate, reduces labor and time costs, and reduces the requirements for processing equipment while improving processing accuracy. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the flipping mechanism;

[0021] Figure 3 This is a schematic diagram of the clamping mechanism;

[0022] Figure 4 This is a schematic diagram of the clamping mechanism;

[0023] Figure 5 This is a cross-sectional view of the valve body being fixed to the positioning mandrel via a faceplate for positioning machining;

[0024] See attached figures: valve body 1; tilting mechanism 2, front plate 2-1, rear plate 2-2, slider 2-3, long groove 2-4, slide rail 2-5, tilting groove 2-6;

[0025] Clamping mechanism 3, pressure plate 3-1, lead screw 3-2, handle 3-3;

[0026] 4. Clamping mechanism, 4-1. Linear bearing, 4-2. Pressure plate, 4-3. Locking bolt, 4-4. Fixing ring, 4-5. Support spring, 4-6. Guide rod; 5. Positioning mandrel, 6. Pattern disc. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings. See also: Figures 1 to 5 , Figures 1 to 5 The present invention is shown as an embodiment, which mainly includes a flipping mechanism 2, a workpiece clamping mechanism 3, a pressing mechanism 4, a positioning mandrel 5, and a faceplate 6 as a lathe connecting member.

[0028] See Figure 1 and Figure 5 The valve body 1 has a through hole at its lower end into which the positioning mandrel 5 is inserted and placed on the faceplate 6. The lower end of the positioning mandrel 5 is detachably connected to the faceplate 6, which serves as a lathe connector, via a threaded structure, thus providing center positioning. After the flipping mechanism 2, clamping mechanism 3, and pressing mechanism 4 are assembled, the faceplate 6 is mounted on the machine tool. The positioning mandrel 5 is a replaceable part and can be adjusted according to the specific dimensions of the valve body 1 to be processed.

[0029] See Figure 3 The clamping mechanism includes a pressure plate 3-1 and a lead screw 3-2. The left and right pressure plates 3-1 are respectively inserted into the through holes on both sides of the valve body 1, thereby pressing the valve body 1 onto the positioning spindle 5. A horizontal lead screw 3-2 is provided on the outer side of the pressure plate 3-1. The end of the lead screw 3-2 facing away from the valve body (outer end) is provided with a handle 3-3 for driving circumferential rotation. The pressure plate 3-1 is a replaceable part and can be adjusted according to the specific dimensions of different models of valve bodies 1.

[0030] Preferably, a circular tube perpendicular to the center of the pressure plate 3-1 is provided at the center of the plate surface. The circular tube is through at both ends and has internal threads on its inner wall. The pressure plate 3-1 is fixedly connected to the lead screw 3-2 through the internal threads and the external threads on the outer wall of the lead screw 3-2.

[0031] Furthermore, the edge of the pressure plate 3-1 is chamfered, preferably with a rounded transition, so as to facilitate insertion into the through holes on both sides of the valve body 1.

[0032] See Figure 2 The flipping mechanism includes a slider 2-3 and fixed plates disposed on both sides of the valve body 1. The lower end of the vertical fixed plate is connected to the upper surface of the flower plate 6. The fixed plate is provided with a long groove 2-4 that runs through its surface, and recessed slide rails 2-5 are provided on the inner sides of the two walls of the long groove 2-4.

[0033] Furthermore, the fixing plate is formed by bolting together the front plate 2-1 and the rear plate 2-2. The edges of the contact points of the front plate 2-1 and the rear plate 2-2 each have rectangular grooves, which are set in the vertical direction; the two grooves together form the slide rail 2-5 after being fitted together, and its width corresponds to the thickness of the thin block.

[0034] The lead screw 3-2 passes horizontally through the long groove 2-4 and connects to the pressure plate 3-1. A slider 2-3 is also sleeved on the outer wall of the lead screw 3-2. The outer wall of the slider 2-3 is provided with a thin block that is adapted to the slide rail 2-5. The two sides of the thin block are respectively inserted into the slide rail 2-5 on both sides of the long groove 2-4.

[0035] The long groove 2-4 is also provided with a flip groove 2-6 for the slider 2-3 to rotate circumferentially. The slider 2-3 moves along the slide rail 2-5 to the flip groove 2-6 via a thin block; the shape and area of ​​the flip groove 2-6 allow the thin block to rotate circumferentially. The screw 3-2 is driven by the handle 3-3 to rotate circumferentially; after flipping to a certain angle, it returns to its original position along the slide rail.

[0036] Further, see Figure 4 The elongated groove 2-4 is straight and extends vertically. The thin plate is arranged radially along the lead screw 3-2, and is preferably square. The two sides of the square are respectively placed in the slide rails 2-5 on both sides of the elongated groove 2-4 and move along the slide rails 2-5. Furthermore, the cross-section of the flipping groove 2-6 is circular, and its diameter is larger than the diagonal length of the thin square to avoid interference.

[0037] See Figure 1 and Figure 4It also includes a clamping mechanism 4. The clamping mechanism 4 is a detachable structure, including a linear bearing 4-1, a pressure plate 4-2, a locking bolt 4-3, a fixing ring 4-4, a support spring 4-5, and a guide rod 4-6. The clamping part located in the middle of the pressure plate 4-2 can be inserted into the elongated groove 2-4 formed by the front fixing plate 2-1 and the front fixing plate 2-2. The clamping part is preferably flat, with its lower end face fitting against the upper end face of the slider 2-3 and limiting its upward degree of freedom. The pressure plate 4-2 has vertical clamping through holes on both sides. The locking bolt 4-3 passes through the clamping through holes, and the lower end of the locking bolt 4-3 is connected to the disc 6 by threads, thus forming a fixed connection between the pressure plate 4-2 and the disc 6. The diameter of the bolt head of the locking bolt 4-3 is larger than that of the clamping through hole. The bolt head can press against the upper end face of the pressure plate 4-2 and restrict it from continuing to move upward, so that the pressure plate 4-2 limits the clamping mechanism 3 through the clamping part, thereby limiting and clamping the valve body 1.

[0038] Furthermore, it also includes a fixing ring 4-4, a support spring 4-5, and a guide rod 4-6. The guide rod 4-6 is slidably connected to the pressure plate 4-2 in the vertical direction via a linear bearing 4-1. The upper end of the guide rod 4-6 is provided with a convex ring (diameter larger than the rod body) to prevent it from falling downwards. The lower end of the guide rod 4-6 abuts against the upper end face of the flower disc 6, and the outer wall of the lower end of the guide rod 4-6 is provided with a fixing ring 4-4. The support spring 4-5 is in a compressed state, with its upper end abutting against the lower end face of the pressure plate 4-2, and its lower end connected to the fixing ring 4-4. The upward elastic force of the support spring 4-5 can support the pressure plate 4-2, thus keeping it always located at the lower end face of the bolt head of the locking bolt 4-3; by adjusting the downward screwing depth of the locking bolt 4-3, the height of the pressure plate 4-2 can be adjusted as needed.

[0039] Initially, the valve body 1 is clamped and fixed by the clamping mechanism 2 and the positioning spindle 5, completing the machining of the first plane. The pressure plate 3-1 and the lead screw 3-2 are fixedly connected by a threaded structure, and the pressure plate 3-1 can rotate circumferentially and move axially synchronously with the lead screw 3-2.

[0040] After the first plane is machined, the valve body 1 is flipped by the flipping mechanism 2 to continue machining the remaining planes. First, the clamping mechanisms 4 on both sides of the valve body 1 are disassembled so that the slider 2-3 is no longer limited. That is, first remove the two locking bolts 4-3 on both sides of the pressure plate 4-2, and then directly remove the rest of the clamping mechanism 4 (linear bearing 4-1, fixing ring 4-4, support spring 4-5 and guide rod 4-6).

[0041] Subsequently, using the hand to hold handle 3-3, the lead screw is moved along the long groove 2-4, while both sides of the thin block slide along the slide rail 2-5. After moving into the circular flip groove 2-6, the handle 3-3 is turned to drive the lead screw 3-2 to rotate circumferentially, which in turn drives the valve body 1 to flip onto the next surface to be processed via the pressure plate 2-3. The other two sides of the thin block are inserted into the slide rails 2-5 on both sides of the long groove 2-4, and then returned along the same path to continue processing the next surface to be processed. By repeating the above operation three times, the feature structures (such as inner holes, inclined surfaces, and arcs) on the four sides of the same circumference of the ball valve 1 can be processed. This can be achieved on a conventional three-axis machine tool, simplifying the processing steps, improving the processing efficiency of parts, and reducing the labor and time costs for workers.

[0042] The embodiments of the present invention have been described above with reference to the accompanying drawings and examples. The structures given in the embodiments do not constitute a limitation of the present invention. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the scope of protection.

Claims

1. A tooling fixture for machining ball valves, wherein the lower end of the valve body is fixed on a faceplate, characterized in that: It includes a clamping mechanism and a flipping mechanism; wherein, the clamping mechanism includes a pressure plate and a lead screw, the two pressure plates are respectively fixed on both sides of the valve body; the pressure plate is provided with a lead screw, and the lead screw is provided with a handle; The flipping mechanism includes a slider and fixed plates on both sides of the valve body. A through slot is provided on the vertical fixed plate, and slide rails are provided on both sides of the slot. A lead screw passes through the slot and is connected to the pressure plate. A slider is sleeved on the lead screw. A thin block adapted to the slide rail is provided on the outer wall of the slider. The thin block is arranged radially along the lead screw and is square or regular polygonal. The two sides of the thin block are respectively placed in the slide rails on both sides of the slot and move along the slide rails. The long groove is also provided with a flip groove for the slider to rotate circumferentially. The flip groove allows the thin block to rotate circumferentially. The slider and the thin block move along the slide rail into the flip groove and drive the lead screw to rotate circumferentially through the handle. After the flip is completed, they return to their original positions along the slide rail.

2. The tooling fixture for machining ball valves according to claim 1, characterized in that: The valve body has through holes on both sides, and a pressure plate of the corresponding size is inserted into the through holes to fix the valve body.

3. The tooling fixture for machining ball valves according to claim 2, characterized in that: The edges of the pressure plate are chamfered.

4. The tooling fixture for machining ball valves according to claim 1, characterized in that: A circular tube perpendicular to the surface of the pressure plate is provided at the center of the plate surface, and the circular tube has internal threads; the pressure plate is fixedly connected to the lead screw through the internal threads.

5. The tooling fixture for machining ball valves according to any one of claims 1-4, characterized in that: The handle is located at the end of the lead screw facing away from the valve body.

6. The tooling fixture for machining ball valves according to claim 1, characterized in that: The long groove is straight and extends vertically.

7. The tooling fixture for machining ball valves according to claim 6, characterized in that: The flipping groove is circular, and its diameter is greater than the diagonal length of the thin block.

8. The tooling fixture for machining ball valves according to claim 1, characterized in that: The fixing plate is formed by fitting a front plate and a rear plate together; the edges of the contact points between the front plate and the rear plate each have a rectangular groove, and the two grooves together form a slide rail after fitting.

9. The tooling fixture for machining ball valves according to claim 1, characterized in that: It is also equipped with a clamping mechanism, including a pressure plate and a locking bolt. The clamping part of the pressure plate can extend into the long groove and limit the upper end face of the slider. The pressure plate is provided with a clamping through hole, and the locking bolt passes through the clamping through hole and is fixedly connected to the flower plate.

10. The tooling fixture for machining ball valves according to claim 9, characterized in that: It also includes a fixing ring, a support spring, and a guide rod. The guide rod is slidably connected to the pressure plate via a linear bearing. The upper end of the guide rod is provided with a convex ring to prevent it from falling downwards, and the lower end of the guide rod is provided with a fixing ring. The support spring is in a compressed state, with its upper end pressing against the lower end face of the pressure plate and its lower end connected to the fixing ring.

11. The tooling fixture for machining ball valves according to claim 10, characterized in that: The clamping part is located in the middle of the pressure plate, and the two sides of the pressure plate are respectively provided with the aforementioned fixing ring, linear bearing, support spring and guide rod.

12. The tooling fixture for machining ball valves according to claim 1, characterized in that: The lower end of the valve body is fixed to the faceplate by a positioning mandrel, and the lower end of the positioning mandrel is detachably connected to the faceplate, which serves as a lathe connecting part.

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