A machine tool fixture for ball valve seat processing

Abstract

A machine tool fixture for ball valve seat processing includes a fixture body, a clamping jaw, a push rod and a positioning piece. The push rod is slidably installed in the fixture body, the positioning piece is installed on the end face of the push rod, one end of the clamping jaw is slidably installed in the fixture body, and the clamping jaw is connected to the part of the push rod installed in the fixture body, and the positioning piece and the clamping jaw are driven to work simultaneously by the push rod. A guide push portion is provided on the push rod, and the clamping jaw is connected to the guide push portion. The clamping jaw is driven to move radially by the guide push portion. When the push rod is pushed outward (toward the ball valve seat), the clamping jaw is closed, and at the same time, the positioning piece is pushed out, and the positioning piece is abutted against the center hole of the ball valve seat; when the push rod is moved inward (away from the ball valve seat), the clamping jaw is spread open, and the positioning piece is separated from the center hole.

Description

Technical Field

[0001] The invention belongs to the technical field of numerically controlled machine tools, and in particular relates to a machine tool fixture for machining a ball valve seat. Background Art

[0002] CNC machine tools are digitally controlled machine tools, which are automated machine tools equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the CNC device through information carriers. After calculation and processing, the CNC device sends various control signals to control the movement of the machine tool and automatically process the parts according to the shape and size required by the drawing.

[0003] During the ball valve seat processing, it is necessary to process multiple through holes with different apertures on the ball valve seat, and some of the through holes are stepped holes with a diameter larger at the top and smaller at the bottom, and the ball valve seat is a stepped shaft with a diameter smaller at the top and larger at the bottom. To facilitate the processing of the stepped holes, the small end face of the ball valve seat is set toward the tool of the CNC machine tool. However, since the large diameter step section of the ball valve seat has a small axial dimension, when the fixture clamps the ball valve seat, it is easy for the ball valve seat axis to be misaligned with the fixture axis, affecting the processing accuracy of the through holes and stepped holes. Summary of the invention

[0004] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a machine tool fixture for ball valve seat processing, which is used to clamp the ball valve seat, ensure that the ball valve seat axis is coaxial with the fixture axis, and improve the hole processing accuracy of the ball valve seat.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A machine tool fixture for processing a ball valve seat comprises a fixture body, a clamping jaw, a push rod and a positioning piece, wherein the push rod is slidably mounted on the fixture body, the positioning piece is mounted on the push rod, and the positioning piece is pushed out by the push rod, a guide pushing portion is provided on the push rod, and the clamping jaw is connected to the guide pushing portion, and the push rod drives the positioning piece to be pushed out and drives the clamping jaw to move radially at the same time, so as to position and clamp the ball valve seat on the machine tool fixture; the ball valve seat comprises at least a first step section and a second step section, the diameter of the first step section is smaller than the diameter of the second step section, the axial thickness of the first step section is larger than the axial thickness of the second step section, and the clamping fixture is used to clamp the second step section.

[0007] As a preferred solution of the present invention, a guide block is provided on the push rod, the guide push portion is arranged on the guide block, and the positioning piece is fixed to the end of the guide block.

[0008] As a preferred solution of the present invention, the guide block includes a sliding head and a fixed head, the sliding head is provided with a guide plate, a guide push portion is formed on the guide plate, the fixed head is detachably mounted on the sliding head, and the guide plate is connected to the fixed head.

[0009] As a preferred solution of the present invention, the fixing head is provided with an internal thread for connecting with the guide plate, and a limiting ring is provided in the fixing head, which is adapted to the inner wall of the guide plate so as to limit the guide plate through the limiting ring.

[0010] As a preferred solution of the present invention, a threaded section is provided at the end of the fixed head, a screw hole is provided on the inner end surface of the sliding head, and the threaded section is connected to the screw hole.

[0011] As a preferred solution of the present invention, the positioning member includes a connecting column, a positioning plate connected to the connecting column and a positioning column fixed to the positioning plate, and the positioning plate and the positioning column are respectively arranged on the outside of the fixture body.

[0012] As a preferred solution of the present invention, a positioning pin is provided on the positioning disk, and the positioning pin is matched with the positioning column, so that the ball valve seat is positioned and fixed by the positioning column and the positioning pin.

[0013] As a preferred solution of the present invention, the positioning plate is provided with a retreat groove matched with the valve seat of the ball valve.

[0014] As a preferred solution of the present invention, a clamping jaw groove is provided on the clamping jaw, and the clamping jaw groove is adapted to the guide pushing portion.

[0015] As a preferred solution of the present invention, a hook is provided on the clamping jaw, and the hook is matched with the positioning member to fix the ball valve seat between the hook and the positioning member.

[0016] The beneficial effects of the present invention are as follows: (1) the machine tool fixture positions and fixes the ball valve seat through the side wall and end surface of the second step section, ensuring that the ball valve seat and the machine tool fixture are coaxially arranged, thereby improving the drilling accuracy of the ball valve seat.

[0017] (2) The guide plate is limited by the limit ring to ensure the connection strength between the sliding head and the fixed head and to ensure the stability of the guide block during the use of the fixture.

[0018] (3) The ball valve seat is further positioned by cooperating with the positioning pin and the positioning column to further ensure that the ball valve seat and the positioning column are coaxial. At the same time, the circumferential direction of the ball valve seat is positioned by setting the positioning pin, so as to ensure the position accuracy of the processed through hole and countersunk hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the ball valve seat.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure after rotating at a certain angle.

[0021] Figure 3 It is a structural diagram of the machine tool fixture.

[0022] Figure 4 It is a cross-sectional view of the machine tool fixture.

[0023] Figure 5 This is a partial enlarged view of point A.

[0024] Figure 6 It is a connection diagram of the positioning piece and the fixed head.

[0025] Figure markings: clamp body 1, end plate 1-1, base plate 1-2, installation cavity 1-3, guide rail 1-4, clamping jaw 2, clamping jaw groove 2-1, hook head 2-2, push rod 3, guide sliding part 3-1, guide block 3-2, sliding head 3-3, fixed head 3-4, guide plate 3-5, limit ring 3-6, threaded section 3-7, screw hole 3-8, mounting ring 3-9, arc portion 3-10, positioning member 4, connecting column 4-1, positioning plate 4-2, positioning column 4-3, positioning pin 4-4, retreat groove 4-5, ball valve seat 5, first step section 5-1, second step section 5-2, step hole 5-3, center hole 5-4, countersunk hole 5-5. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] A machine tool fixture for ball valve seat processing is used to clamp the ball valve seat 5, so as to facilitate the CNC machine tool to perform drilling processing on the ball valve seat 5. The ball valve seat 5 to be clamped by the machine tool fixture includes a first step section 5-1 and a second step section 5-2 connected to each other. The diameter of the second step section 5-2 is larger than the diameter of the first step section 5-1. The axial thickness of the first step section 5-1 is relatively large, which is 12-13mm, and the axial thickness of the second step section 5-2 is relatively small, which is only 2-3mm. In order to improve the processing efficiency of the ball valve seat 5, it is necessary to set the side with a larger aperture of the stepped hole 5-3 of the ball valve seat 5 toward the tool side, so it is necessary to clamp the second step section 5-2. When the ordinary fixture clamps the second step section 5-2, due to the small thickness of the second step section 5-2, it is easy to cause the ball valve seat axis and the machine tool fixture axis to deviate, affecting the drilling accuracy of the ball valve seat 5.

[0028] The machine tool fixture includes a fixture body 1, a clamping jaw 2, a push rod 3 and a positioning member 4. The push rod 3 is slidably installed in the fixture body 1, and the positioning member 4 is installed on the end surface of the push rod 3. One end of the clamping jaw 2 is slidably installed in the fixture body 1, and the part of the clamping jaw 2 installed in the fixture body 1 is connected to the push rod 3, and the positioning member 4 and the clamping jaw 2 are driven to work simultaneously through the push rod 3. A guide push portion 3-1 is provided on the push rod 3, and the clamping jaw 2 is connected to the guide push portion 3-1. The clamping jaw 2 is driven to move radially through the guide push portion 3-1. In this embodiment, when the push rod 3 is pushed outward (toward the direction of the ball valve seat), the clamping jaw 2 is retracted, and at the same time, the positioning member 4 is pushed out, and the positioning member 4 is abutted against the center hole 5-4 of the ball valve seat 5; when the push rod 3 moves inward (away from the ball valve seat), the clamping jaw 2 is spread open, and the positioning member 4 is separated from the center hole 5-4.

[0029] In this embodiment, the second step section 5-2 is clamped by the inner wall of the clamping jaw 2, and at the same time, the end surface of the second step section 5-2 is positioned by the end surface of the positioning member 4, that is, the machine tool fixture positions and fixes the ball valve seat 5 by the side wall and end surface of the second step section 5-2, ensuring that the ball valve seat 5 is coaxially arranged with the machine tool fixture, thereby improving the drilling accuracy of the ball valve seat.

[0030] The push rod 3 is provided with a guide block 3-2, which includes a sliding head 3-3 and a fixed head 3-4. The sliding head 3-3 is provided with a guide plate 3-5, and a guide push portion 3-1 is formed on the guide plate 3-5. The clamping jaw 2 is slidably connected to the guide plate 3-5, and the fixed head 3-4 is detachably mounted on the sliding head 3-3, and the guide plate 3-5 is connected to the fixed head 3-4. Preferably, a gap is provided between the sliding head 3-3 and the fixed head 3-4 to facilitate the sliding of the clamping jaw 2 on the guide plate 3-5.

[0031] In this embodiment, the guide block 3-2 is in the shape of a truncated cone, and the diameter of the guide block 3-2 gradually increases from the side of the push rod 3 to the side of the positioning member 4, so that when the guide block 3-2 moves outward, the clamping jaw 2 is acted upon by the guide plate 3-5 to shrink and move.

[0032] A mounting ring 3-9 is provided on the end face of the fixed head 3-4, an internal thread is provided on the inner side of the mounting ring 3-9, an arc portion 3-10 is provided on the top of the guide plate 3-5, an external thread is provided on the arc portion 3-10, and the guide plate 3-5 is connected to the mounting ring 3-9 through the external thread, and a limiting ring 3-6 is provided in the fixed head 3-4, the limiting ring 3-6 and the mounting ring 3-9 are coaxially arranged, and the limiting ring 3-6 is adapted to the inner wall of the guide plate 3-5, that is, the limiting ring 3-6 abuts against the inner wall of the guide plate 3-5, so that the guide plate 3-5 is limited by the limiting ring 3-6, thereby ensuring the connection strength of the sliding head 3-3 and the fixed head 3-4, and ensuring the stability of the guide block 3-2 during the use of the clamp.

[0033] To ensure the coaxiality of the sliding head 3-3 and the fixed head 3-4, a threaded section 3-7 is provided at the end of the fixed head 3-4, and a threaded hole 3-8 is provided on the inner end face of the sliding head 3-3. The threaded section 3-7 is connected to the threaded hole 3-8, thereby realizing the connection of both ends of the sliding head 3-3 to both ends of the fixed head 3-4.

[0034] The positioning member 4 includes a connecting column 4-1, a positioning disk 4-2 connected to the connecting column 4-1, and a positioning column 4-3 fixed on the positioning disk 4-2. The positioning disk 4-2 and the positioning column 4-3 are respectively arranged on the outer side of the fixture body 1 for positioning the ball valve seat 5. Among them, the positioning disk 4-2 is adapted to the end face of the ball valve seat 5 for positioning the end face of the ball valve seat 5. The cross section of the positioning column 4-3 is conical, and the positioning column 4-3 is used for inserting into the central hole 5-4 of the ball valve seat 5, thereby ensuring the coaxiality of the ball valve seat 5 and the positioning column 4-3. Preferably, the positioning column 4-3 and the central hole 5-4 of the ball valve seat 5 are in transitional fit. A positioning pin 4-4 is provided on the positioning disk 4-2, and the positioning pin 4-4 cooperates with the counterbore 5-5 on the end face of the ball valve seat 5. The positioning pin 4-4 is adapted to the positioning column 4-3, that is, due to the transitional fit between the positioning column 4-3 and the central hole 5-4, a certain gap will be generated between the positioning column 4-3 and the central hole 5-4. The ball valve seat 5 is further positioned by the cooperation of the positioning pin 4-4 and the positioning column 4-3, further ensuring the coaxiality of the ball valve seat 5 and the positioning column 4-3. At the same time, through the setting of the positioning pin 4-4, the circumferential positioning of the ball valve seat 5 is carried out, which is convenient for ensuring the position accuracy of the through hole and the counterbore 5-5 to be processed.

[0035] A relief groove 4-5 adapted to the ball valve seat 5 is provided on the positioning disk 4-2. Preferably, the relief groove 4-5 is annular, so that the relief groove 4-5 is arranged opposite to the through hole to be processed on the ball valve seat 5, preventing the tool from contacting the positioning disk 4-2 during the processing.

[0036] In this embodiment, the jaw 2 has a U-shaped structure. One end of the jaw 2 is provided with a jaw groove 2-1, so that the jaw 2 can be slidably connected to the guiding and pushing part 3-1 through the jaw groove 2-1. The other end of the jaw 2 forms a hook 2-2, and the hook 2-2 is adapted to the positioning member 4, that is, the hook 2-2 abuts against the stepped surface of the second stepped section 5-2, thereby fixing the ball valve seat 5 between the hook 2-2 and the positioning member 4. A certain reaction force is provided to the second stepped section 5-2 through the hook 2-2, so that the end face of the second stepped section 5-2 abuts against the positioning disk 4-2, further ensuring the clamping accuracy of the ball valve seat 5.

[0037] The clamp body 1 includes an end plate 1-1 and a base plate 1-2, a push rod 3 is slidably installed in the base plate 1-2, the end plate 1-1 and the base plate 1-2 are assembled to form an installation cavity 1-3, a guide rail 1-4 is installed in the installation cavity 1-3, the clamping jaw 2 is slidably installed in the installation cavity 1-3 through the guide rail 1-4, and the clamping jaw 2 is extended out of the end plate 1-1.

[0038] The working principle of this fixture is as follows:

[0039] The push rod 3 moves toward the ball valve seat 5, and the clamping jaws 2 move radially under the action of the guide push portion 3-1, so that the clamping jaws 2 are tightened. At the same time, since the push rod 3 moves toward the ball valve seat 5, the positioning member 4 moves toward the center hole 5-4 of the ball valve seat 5, and the ball valve seat 5 is preliminarily positioned by the positioning column 4-3. As the push rod 3 continues to move, the positioning pin 4-4 is inserted into the countersunk hole 5-5, thereby further positioning the ball valve seat 5. The push rod 3 continues to move, so that the inner side wall of the clamping jaws 2 abuts against the circumferential side wall of the second step section 5-2, and at the same time, the hook portion 2-2 of the clamping jaws 2 abuts against the step surface of the second step section 5-2, so that the end face of the ball valve seat 5 abuts against the positioning plate 4-2, thereby realizing the positioning and clamping of the ball valve seat 5.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0041] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A machine tool fixture for ball valve seat processing, characterized in that: The machine tool fixture comprises a fixture body (1), a clamping jaw (2), a push rod (3) and a positioning member (4); the push rod (3) is slidably mounted on the fixture body (1); the positioning member (4) is mounted on the push rod (3); the positioning member (4) is driven to be pushed out by the push rod (3); a guide push portion (3-1) is provided on the push rod (3); the clamping jaw (2) is connected to the guide push portion (3-1); the push rod (3) drives the positioning member (4) to be pushed out and drives the clamping jaw (2) to move radially at the same time, so as to position and clamp the ball valve seat (5) on the machine tool fixture; The ball valve seat (5) comprises at least a first step section (5-1) and a second step section (5-2); the diameter of the first step section (5-1) is smaller than the diameter of the second step section (5-2); the axial thickness of the first step section (5-1) is greater than the axial thickness of the second step section (5-2); the machine tool fixture is used to clamp the second step section (5-2); the positioning member (4) comprises a connecting column (4-1), a positioning plate (4-2) connected to the connecting column (4-1), and a positioning column (4-3) fixed to the positioning plate (4-2); the positioning plate (4-2) and the positioning column (4-3) are respectively arranged on the outside of the fixture body (1).

2. A machine tool fixture for ball valve seat processing according to claim 1, characterized in that: The push rod (3) is provided with a guide block (3-2), the guide push portion (3-1) is arranged on the guide block (3-2), and the positioning member (4) is fixed on the end of the guide block (3-2).

3. A machine tool fixture for ball valve seat processing according to claim 2, characterized in that: The guide block (3-2) comprises a sliding head (3-3) and a fixed head (3-4); the sliding head (3-3) is provided with a guide plate (3-5); a guide push portion (3-1) is formed on the guide plate (3-5); the fixed head (3-4) is detachably mounted on the sliding head (3-3); and the guide plate (3-5) is connected to the fixed head (3-4).

4. A machine tool fixture for ball valve seat processing according to claim 3, characterized in that: The fixing head (3-4) is provided with an internal thread for connecting with the guide plate (3-5), and a limiting ring (3-6) is provided inside the fixing head (3-4). The limiting ring (3-6) is adapted to the inner wall of the guide plate (3-5) so as to limit the guide plate (3-5) through the limiting ring (3-6).

5. The machine tool fixture for ball valve seat processing according to claim 3, characterized in that: The end of the fixed head (3-4) is provided with a threaded section (3-7), the inner end surface of the sliding head (3-3) is provided with a screw hole (3-8), and the threaded section (3-7) is connected to the screw hole (3-8).

6. The machine tool fixture for ball valve seat processing according to claim 1, characterized in that: The positioning disk (4-2) is provided with a positioning pin (4-4), which is matched with the positioning column (4-3) so as to position and fix the ball valve seat (5) through the positioning column (4-3) and the positioning pin (4-4).

7. The machine tool fixture for ball valve seat processing according to claim 1, characterized in that: The positioning disk (4-2) is provided with a retreat groove (4-5) adapted to the ball valve seat (5).

8. The machine tool fixture for ball valve seat processing according to claim 1, characterized in that: The clamping jaw (2) is provided with a clamping jaw groove (2-1), and the clamping jaw groove (2-1) is adapted to the guide pushing portion (3-1).

9. The machine tool fixture for ball valve seat processing according to claim 1, characterized in that: The clamping claw (2) is provided with a hook head (2-2), which is matched with the positioning member (4) to fix the ball valve seat (5) between the hook head (2-2) and the positioning member (4).

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