Steering clamp for machining pneumatic valve seat

Abstract

The utility model relates to a steering clamp for processing a pneumatic valve seat, which comprises an indexing chuck arranged on a lathe spindle, a steering shaft arranged on the indexing chuck and used for adjusting the angle of the valve seat, a pressing rod used for clamping the valve seat, an adapter seat, a separation blade and a locking screw, the utility model aims to enable the inner hole of the valve seat to face the cylindrical part manually or by a manipulator, enable the extension pipe to be close to the outer side of the baffle plate, enable the valve seat to be connected with the bottom plane after the valve seat is pressed downwards, rotate the valve seat and enable the extension pipe to abut against the baffle plate, thereby completing positioning, and then control the pressing rod to press downwards. The valve seat is completely fixed on the adapter seat, so that the clamped valve seat is accurately positioned, the operation mode of disassembling and assembling the valve seat is simple, and the requirement of batch production is met.

Description

Technical Field

[0001] This utility model relates to the technical field of lathe machining, and in particular to a steering jig for precision machining of valve seats. Background Technology

[0002] After the pneumatic valve seat is cast, multiple holes in various directions need to be precision machined to meet assembly requirements. Therefore, an automatic indexing chuck for lathes is required. The indexing chuck is mounted on the lathe spindle and can quickly switch the orientation of the workpiece during spindle rotation. By controlling the rotation angle of the workpiece through programming, the corresponding holes are made coaxial with the spindle after rotation, thereby improving the machining efficiency of the workpiece. However, during clamping, the workpiece needs to be accurately mounted on the indexing chuck. If the installation error is large, the valve seat hole diameter will deviate from the design standard, which will seriously affect the sealing performance of the valve seat and cause severe wear of the cutting tool. Therefore, it is necessary to develop a steering fixture that can accurately position the workpiece. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a steering jig for machining pneumatic valve seats, including an indexing chuck mounted on a lathe spindle, the indexing chuck having a steering shaft for adjusting the valve seat angle and a pressure rod for clamping the valve seat, and also including an adapter seat, a baffle and a locking screw, the steering shaft being detachably connected to the adapter seat, the adapter seat having a bottom plane for mounting the valve seat and a cylindrical portion for connecting the inner hole of the valve seat, one side of the adapter seat having a stepped surface parallel to the bottom plane, the stepped surface being connected to a baffle for restricting the rotational freedom of the valve seat, the baffle being connected to the adapter seat by a locking screw.

[0004] Using the above technical solution, the valve seat has an inner hole, and the valve seat is surrounded by connecting pipes that need to be machined. An extension pipe is provided between two of the connecting pipes. After the bottom surface of the valve seat is precision ground, the inner hole of the valve seat is aligned with the cylindrical part by manual or robotic arm, and the extension pipe is brought close to the outside of the baffle. After pressing down the valve seat, the valve seat is brought into contact with the bottom plane. At this time, the valve seat is rotated and the extension pipe is brought into contact with the baffle to complete the positioning. Then, the pressure rod is pressed down to fix the valve seat completely on the adapter seat. This ensures that the valve seat is accurately positioned after clamping, and the operation of disassembling and assembling the valve seat is simple, which meets the needs of mass production.

[0005] The present invention is further configured such that the baffle has a blocking part and a mounting part, the blocking part extends upward at an incline relative to the mounting part, the mounting part has an elongated hole, the adapter has a mounting hole corresponding to the elongated hole, and the locking screw passes through the elongated hole and the mounting hole in sequence and is threaded to the steering shaft. The baffle can be adjusted laterally along the elongated hole and the stepped surface, and is suitable for different types of valve seats.

[0006] The present invention is further provided that the blocking part is provided with a notch at the bottom plane. The notch is used to avoid the edges of the extension tube and to prevent untreated burrs at the edges from touching the blocking part, thereby improving the installation accuracy of the valve seat.

[0007] The present invention is further configured such that the steering shaft has a protrusion for connecting the adapter seat, the protrusion has a cross-section for restricting the rotational freedom of the adapter seat, and the adapter seat has a mounting groove that matches the protrusion. By restricting the rotational freedom of the adapter seat through the cross-section, the adapter seat does not need to be repositioned and adjusted after replacement.

[0008] The present invention is further configured such that the protrusion is provided with threaded holes coaxially distributed with the mounting holes at the cross section, and the locking screw passes through the baffle and the adapter in sequence and is threaded to the protrusion, so that there are fewer accessories on the fixture, the connection relationship is simple, and the failure rate of the fixture is reduced.

[0009] The present invention is further provided that the cylindrical part is provided with an annular groove on the side near the bottom plane. After the bottom surface of the valve seat is finely ground, there will inevitably be burrs on the edge of its inner hole. The annular groove can be used to avoid them, thereby improving the installation accuracy of the valve seat and eliminating the need to add a deburring process for the inner hole of the valve seat before installation.

[0010] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present utility model;

[0012] Figure 2 For the present utility model Figure 1 A magnified view of the central A-direction view;

[0013] Figure 3 This is a front view of the adapter of this utility model;

[0014] Figure 4 This is a schematic diagram of the indexing chuck of this utility model;

[0015] Figure 5 This is a perspective view of the valve seat of this utility model;

[0016] Figure 6 This is a schematic diagram of the structure of the valve seat during processing according to this utility model;

[0017] Wherein: 1-Indexing chuck, 2-Steering shaft, 3-Pressure rod, 4-Adapter seat, 5-Baffle, 6-Locking screw, 7-Bottom plane, 8-Cylindrical part, 9-Stepped surface, 11-Blocking part, 12-Mounting part, 13-Elongated hole, 14-Mounting hole, 15-Slit groove, 16-Protrusion, 17-Cross-section, 18-Threaded hole, 19-Annular groove, 20-Valve seat, 21-Inner hole, 22-Extension tube; Detailed Implementation

[0018] Combination Figure 1 , 2 As shown, a steering jig for machining pneumatic valve seats includes an indexing chuck 1 mounted on a lathe spindle. The indexing chuck 1 has a steering shaft 2 for adjusting the valve seat angle and a pressure rod 3 for clamping the valve seat. It also includes an adapter 4, a baffle 5, and a locking screw 6. The steering shaft 2 is detachably connected to the adapter 4. The adapter 4 has a bottom plane 7 for mounting the valve seat and a cylindrical portion 8 for connecting the inner hole of the valve seat. One side of the adapter 4 has a stepped surface 9 parallel to the bottom plane 7. The stepped surface 9 is connected to a baffle 5 for restricting the rotational freedom of the valve seat. The baffle 5 is connected to the adapter 4 by the locking screw 6.

[0019] Combination Figure 3 As shown, in this embodiment, the baffle 5 is provided with a blocking part 11 and a mounting part 12. The blocking part 11 extends upward at an incline relative to the mounting part 12. The mounting part 12 is provided with an elongated hole 13. The adapter 4 is provided with a mounting hole 14 corresponding to the elongated hole 13. The locking screw 6 passes through the elongated hole 13 and the mounting hole 14 in sequence and is threaded to the steering shaft 2. The baffle 5 can be adjusted laterally along the elongated hole 13 and the stepped surface 9. The blocking part 11 is provided with a notch 15 at the bottom plane 7. The notch 15 is used to avoid the sharp corners at the bottom of the extension tube. The cylindrical part 8 is provided with an annular groove 19 on the side near the bottom plane 7. After the bottom surface of the valve seat is finely ground, there will inevitably be burrs at the edge of its inner hole. The annular groove 19 can avoid them, improving the installation accuracy of the valve seat and eliminating the need to add a deburring process for the inner hole of the valve seat before installation.

[0020] Combination Figure 4 As shown, in this embodiment, the steering shaft 2 is provided with a protrusion 16 for connecting the adapter 4. The protrusion 16 is provided with a cross section 17 for restricting the rotational freedom of the adapter 4. The adapter 4 is provided with a mounting groove that matches the protrusion 16. By restricting the rotational freedom of the adapter 4 through the cross section 17, the adapter 4 does not need to be repositioned and adjusted after replacement. The protrusion 16 is provided with threaded holes 18 coaxially distributed with the mounting holes 14 at the cross section 17. The locking screw 6 passes through the baffle 5 and the adapter 4 in sequence and is threaded to the protrusion 16, which reduces the number of parts on the fixture, simplifies the connection relationship, and reduces the failure rate of the fixture.

[0021] Combination Figure 5 ,6 As shown, the working principle of this utility model is as follows: after the bottom surface of the valve seat 20 is finely ground, the inner hole 21 of the valve seat 20 is aligned with the cylindrical part 8 by manual or robotic arm, and the extension tube is brought close to the outside of the blocking part 11. After the valve seat 20 is pressed down, the valve seat 20 is brought into contact with the bottom plane 7. At this time, the valve seat 20 is rotated and the extension tube 22 is brought into contact with the blocking part 11, thereby completing the positioning. Then, the pressure rod 3 is controlled to press down, so that the valve seat 20 is completely fixed on the adapter 4, so that the valve seat 20 is accurately positioned after clamping, and the operation of disassembling and assembling the valve seat 20 is simple, which meets the needs of mass production.

[0022] In addition to the embodiments described above, this utility model may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A turning fixture for machining a gas dynamic seat, comprising an indexing chuck (1) mounted on the spindle of a lathe, the indexing chuck (1) being provided with a turning shaft (2) for adjusting the angle of the seat, and a pressing rod (3) for clamping the seat, characterized in that, The adapter (4), the stopper (5) and the locking screw (6) are also included, the adapter (4) is detachably connected with the steering shaft (2), the adapter (4) is provided with a bottom plane (7) for installing the valve seat and a cylindrical part (8) for connecting the inner hole of the valve seat, one side of the adapter (4) is provided with a step surface (9) parallel to the bottom plane (7), the step surface (9) is connected with the stopper (5) for limiting the rotation freedom of the valve seat, and the stopper (5) is connected with the adapter (4) through the locking screw (6).

2. A turning fixture for machining a gas dynamic valve seat according to claim 1, characterized in that: The stopper (5) is provided with a blocking part (11) and a mounting part (12), the blocking part (11) extends upwardly and obliquely relative to the mounting part (12), the mounting part (12) is provided with a long hole (13), the adapter (4) is provided with a mounting hole (14) corresponding to the long hole (13), and the locking screw (6) is threadedly connected with the steering shaft (2) through the long hole (13) and the mounting hole (14) in sequence.

3. A turning fixture for machining a gas dynamic valve seat according to claim 2, characterized in that: The blocking part (11) is provided with a cutout groove (15) at the bottom plane (7).

4. A turning fixture for machining a gas dynamic valve seat according to claim 3, characterized in that: The steering shaft (2) is provided with a convex part (16) for connecting the adapter (4), the convex part (16) is provided with a transverse surface (17) for limiting the rotation freedom of the adapter (4), and the adapter (4) is provided with a mounting groove matched with the convex part (16).

5. A turning fixture for machining a gas dynamic valve seat according to claim 4, characterized in that: The convex part (16) is provided with a threaded hole (18) coaxially distributed with the mounting hole (14) at the transverse surface (17).

6. A turning fixture for machining a gas dynamic valve seat according to claim 5, characterized in that: The cylindrical part (8) is provided with a circular ring groove (19) on one side close to the bottom plane (7).

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