Clamp for machining three faces of valve body on vertical lathe

Abstract

A clamp for machining three faces of a valve body on a vertical lathe comprises a main supporting frame, the main supporting frame is installed on a vertical lathe chuck, and the centers of the main supporting frame and the vertical lathe chuck are concentric; the rotary mould frame is arranged on the inner side of the main supporting frame and is rotationally connected with the main supporting frame through a supporting shaft, and the supporting shaft on one side of the main supporting frame is provided with a gear transmission mechanism; one end, extending out of the outer wall of the main support frame, of the screw rod is locked by a locking nut after the screw rod and the inner hole of the support shaft are assembled through threads, and the other end of the screw rod is provided with a clamping jaw for clamping a valve body; the outer end of the supporting shaft on the other side of the main supporting frame is connected with a bearing, and the bearing is positioned and fixed through a bearing gland. Through one-time valve body clamping, valve body correcting, firm fixing and corresponding angle adjusting, the to-be-machined faces of the valve body can be machined in sequence, repeated clamp assembling and disassembling are reduced, the correcting, clamping and hoisting frequency is reduced, meanwhile, the machining efficiency is improved, the machining period is shortened, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve processing, in particular to a clamp used for vertical lathe processing three surfaces of a valve body. Background Art

[0002] In the valve manufacturing process, the processing accuracy of the valve body directly affects the performance and service life of the valve. When processing the valve body, the traditional fixture often clamps one side flange first, processes the other side flange, and then turns around to clamp one side flange after the processing is completed, processes the other side flange, and then positions and clamps the left and right flanges to process the middle flange; after the processing is completed, the 5° mold is clamped again to process the sealing surface; this leads to problems such as low processing efficiency and long processing cycle. Batch processing is even more inefficient; the valve body processing, clamping and correction are many times, which is very time-consuming and laborious; especially in the process of ordinary lathe or vertical lathe processing, repeated clamping and alignment are inefficient, and it is necessary to ensure that the valve body can maintain stable positioning and accuracy during processing, which places higher requirements on the fixture. Therefore, it is necessary to optimize the above multiple clamping methods and design a simple clamping fixture that can process all required surfaces with one clamping. Summary of the invention

[0003] The invention provides a clamp for machining three surfaces of a valve body by vertical lathe, aiming at improving the efficiency, precision and stability of valve body machining.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A clamp for processing three sides of a valve body for a vertical lathe, comprising a main support frame, which is mounted on a vertical lathe chuck and the centers of the two are concentric; a rotating jig frame is arranged on the inner side of the main support frame and is rotatably connected to the main support frame through a support shaft, and a gear transmission mechanism is installed on the support shaft on one side of the main support frame; after the screw rod and the inner hole of the support shaft are threadedly assembled, one end extending out of the outer wall of the main support frame is locked with a locking nut, and a claw is installed on the other end of the screw rod for clamping the valve body; the outer end of the support shaft on the other side of the main support frame is connected to a bearing, and the bearing is positioned and fixed with a bearing pressure cover.

[0005] The gear transmission mechanism includes a large gear and a small gear. The large gear key is connected to the support shaft, and the small gear key is connected to the small gear positioning sleeve. The small gear positioning sleeve is installed on the convex shaft on the main support frame, and the large gear and the small gear are meshed for transmission. The gear transmission mechanism is limited by a limiting structure.

[0006] The limiting structure includes a limiting block which is installed on the outer circumferential surface of a cylinder with an internal threaded hole, and the head shape of the limiting block matches the tooth shape of the pinion; a first threaded hole and a second threaded hole are opened on the general support frame below the pinion, and studs are installed in the first threaded hole and the second threaded hole, and the other end of the stud is matched with the internal thread of the cylinder of the limiting structure.

[0007] The shape of the clamping claw is adapted to the shape of the valve body.

[0008] An adjusting bolt is arranged on the bottom surface of the main support frame, and the adjusting bolt is in contact with the valve body.

[0009] A gear cover is installed on the outer side of the gear transmission mechanism.

[0010] The new method can clamp the valve body once, calibrate the various surfaces of the valve body to fix them firmly, adjust the corresponding angles, and then sequentially process the required processing surfaces of the valve body; reduce the number of calibration clamping and hoisting times, while improving processing efficiency and processing cycle and being convenient and fast; ensure processing accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the cross-section structure of the present invention (the valve body is rotated 90 degrees); Figure 2 It is a three-dimensional isometric schematic diagram of the present invention (the valve body is rotated 90°); Figure 3 for Figure 2 Schematic diagram of the main structure; Figure 4 This is the main view of the valve body when it is normally installed; Figure 5 This is a schematic diagram of the claw structure of the present invention; Figure 6 It is a schematic diagram of the gear cover of the present invention; Figure 7 for Figure 1 Schematic diagram of the left side; Figure 8 This is a schematic diagram of the structure of the limit card block of the present invention; Fig. 9 This is a schematic diagram of the support shaft structure of the present invention; Fig.10 It is a schematic diagram of the structure of the rotating tire frame of the present invention. DETAILED DESCRIPTION

[0012] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] Reference Figure 1-Figure 10 A fixture for processing three sides of a valve body for a vertical lathe comprises a main support frame, wherein the main support frame 1 is mounted on the chuck of the vertical lathe and the centers of the two are concentric; a rotating jig frame 2 is arranged on the inner side of the main support frame 1 and is rotatably connected to the main support frame 1 through a support shaft 3, and a gear transmission mechanism is installed on the support shaft 3 on one side of the main support frame 1; after the screw rod 4 and the inner hole thread of the support shaft 3 are assembled, one end extending out of the outer wall of the main support frame is locked with a locking nut 13, and a claw 14 is installed on the other end of the screw rod 4 for clamping the valve body 6; the outer end of the support shaft 3 on the other side of the main support frame 1 is connected to a bearing 7, and the bearing 7 is positioned and fixed with a bearing pressure cover 8.

[0014] The main support frame 1 is connected to the vertical lathe chuck by a bolt pressure plate, and the center holes of the bottom plates of the two components are concentric; one end of the support shaft 3 is fixed to the rotating jig frame 2 by bolts, and the other end of the support shaft 3 is assembled in the shaft hole of the main support frame 1, and the center holes of the three are concentric; after the screw 4 and the internal thread of the support shaft are assembled, the large round head of one end of the screw is installed in the concave hole on the back of the claw 14 and is pressed and bolted with a pressure cap 5. Manually rotate the left end of the screw, and the corresponding claw moves left and right to form two states of clamping and loosening of the claw; ensure that the clamping is firm and does not move; before clamping, adjust the valve body center, the support frame center, and the vertical lathe chuck center to be concentric.

[0015] When the valve body is rotated to the processing surface, the main support frame and the rotating tire frame are positioned with a pin. Figure 7 As shown, the left end of the main support frame is provided with axial pin holes 17-1, 17-2, and 17-3 which are 90 degrees to each other. Figure 2 As shown, the right end of the total support frame is provided with pin holes 18-1, 18-2, and 18-3 which are 90 degrees to each other; use a wrench to rotate the end of the positioning sleeve, which will then drive the entire rotating tire frame to rotate. After it reaches the corresponding position, the pin is inserted into the corresponding pin hole to fix the total support frame and the rotating tire frame as a whole. Fig.10 As shown, the rotating jig frame is provided with four pin holes at positions of 0°, 90°, 180°, and 270° (to facilitate accurate positioning and fixation after rotating 90°), and the center distance of the pin holes is the same as the center distance of the pin holes on the main support frame.

[0016] The gear transmission mechanism includes a large gear 10 and a small gear 9. The large gear 10 is key-connected to the support shaft 3, and the small gear 9 is key-connected to the small gear positioning sleeve 15. The small gear positioning sleeve 15 is installed on the convex shaft on the main support frame, and the large gear 10 and the small gear 9 are meshed for transmission. The gear transmission mechanism is limited by a limiting structure.

[0017] The limiting structure includes a limiting block 11 which is mounted on the outer circumference of a cylinder with an internal threaded hole, and the head shape of the limiting block 11 matches the tooth shape of the pinion 9; a first threaded hole 11-1 and a second threaded hole 11-2 are opened on the general support frame 1 below the pinion 9, and a stud is installed in the first threaded hole 11-1 and the second threaded hole 11-2, and the other end of the stud is matched with the internal thread of the cylinder of the limiting structure. When the gear rotates to a suitable position, the limiting block clamps the gear to limit the gear transmission.

[0018] The shape of the clamping claw 14 is a clamping claw structure that matches the shape of the valve body. Such a design allows the clamp to clamp firmly and is not prone to loosening and causing position deviation; it is beneficial for the multi-directional limit clamping of the valve body to prevent the center of the valve body from deviating.

[0019] An adjusting bolt 16 is arranged on the bottom surface of the main support frame 1, and the adjusting bolt 16 contacts the valve body. If there is a difference between the center height of the valve body and the center of the screw, the adjusting bolt 16 is fine-tuned to make the valve body and the center of the screw concentric.

[0020] A gear cover is installed outside the gear transmission mechanism and bolts are tightened on the outer wall of the main support frame to prevent the gear mechanism from moving.

[0021] The clamping process of the present invention: The valve body processed by the present invention has three flange openings, all of which are processed surfaces. During installation, the valve body is hoisted between the two claws for alignment and leveling. The unopened valve body surface and the bottom surface of the rotating jig frame are in contact through screws 12. If there is a difference between the center height of the valve body and the center of the screw, the screws 12 on the bottom surface of the rotating jig frame are fine-tuned to make the valve body concentric with the center of the screw; then the screw is driven to rotate respectively to drive the left and right claws to move to the corresponding positions to clamp the valve body, adjust the center and clamp the valve body to fix it firmly. After finally meeting the requirements, tighten the claws at both ends and lock the locking nuts, and rotate the limit block to the corresponding blocking position to clamp it, and insert the pin into the corresponding pin hole for fixing; after the whole is fixed, the corresponding flange begins to be processed, and after adjusting 90° after processing, the corresponding flange is fixed again with the pin to process, and the corresponding angles are adjusted in turn to process the corresponding flange processing surface; until the required processing surface is completed; at this point, the valve body is disassembled and replaced, and the next valve body is processed; and the cycle is repeated in sequence.

Claims

1. A fixture for machining three sides of a valve body for a vertical lathe, comprising a main support frame, characterized in that: The main support frame (1) is mounted on the chuck of the vertical lathe and the centers of the two are concentric; the rotating jig frame (2) is arranged on the inner side of the main support frame (1) and is rotatably connected to the main support frame (1) through the support shaft (3); a gear transmission mechanism is installed on the support shaft (3) on one side of the main support frame (1); after the screw rod (4) and the inner hole of the support shaft (3) are threadedly matched, one end extending out of the outer wall of the main support frame is locked with a locking nut (13), and the other end of the screw rod (4) is installed with a claw (14) for clamping the valve body (6); the outer end of the support shaft (3) on the other side of the main support frame (1) is connected to the bearing (7), and the bearing (7) is positioned and fixed with a bearing pressure cover (8).

2. A fixture for machining three surfaces of a valve body for a vertical lathe according to claim 1, characterized in that: The gear transmission mechanism comprises a large gear (10) and a small gear (9); the large gear (10) is key-connected to the support shaft (3); the small gear (9) is key-connected to the small gear positioning sleeve (15); the small gear positioning sleeve (15) is mounted on a convex shaft on the main support frame, and the large gear (10) and the small gear (9) are meshed for transmission; the gear transmission mechanism is limited by a limiting structure.

3. A fixture for machining three surfaces of a valve body for a vertical lathe according to claim 2, characterized in that: The limiting structure comprises a limiting block (11), the limiting block (11) being mounted on the outer circumferential surface of a cylinder having an internal threaded hole, and the head shape of the limiting block (11) matches the tooth shape of the pinion gear (9); a first threaded hole (11-1) and a second threaded hole (11-2) are formed on the general support frame (1) below the pinion gear (9), studs are mounted in the first threaded hole (11-1) and the second threaded hole (11-2), and the other end of the stud is fitted with the internal thread of the cylinder of the limiting structure.

4. The fixture for machining three surfaces of a valve body for a vertical lathe according to claim 1 is characterized in that: The shape of the clamping claw (14) is a clamping claw structure that matches the shape of the valve body.

5. The fixture for machining three surfaces of a valve body for a vertical lathe according to claim 1, characterized in that: An adjusting bolt (16) is arranged on the bottom surface of the main support frame (1), and the adjusting bolt (16) is in contact with the valve body.

6. The fixture for machining three surfaces of a valve body for a vertical lathe according to claim 1, characterized in that: A gear cover is installed on the outer side of the gear transmission mechanism.

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