Fixture for machining and milling aperture end face of stop valve

Abstract

The invention relates to a clamp for machining and milling a caliber end face of a stop valve, which comprises a support assembly used for supporting a device; the supporting assembly comprises a base, and a mounting vertical plate is fixedly mounted at the top of the base. The output port of the supporting assembly faces the position of a milling tool, the electric push rod is started to drive the upper pressing plate and the lower pressing plate to get close to each other to clamp a valve body workpiece, then the rotating motor is started to drive the whole [-shaped plate to turn over, and therefore the different end faces of the valve body workpiece are machined, adaptability is high, and machining efficiency is high. Independent turning over is not needed, the device is suitable for valve body workpieces of various specifications, and the problems that in the prior art, the structure is complex, and adjusting steps are tedious are solved; and the problem of flying chips is solved mostly by depending on an external blowing or dust collecting device, so that the equipment cost is increased, and the problem of machining interruption possibly caused by the fact that flying chips are accumulated in a workpiece is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of globe valves, and particularly relates to a fixture for milling the end face of the caliber of a globe valve. Background Art

[0002] In the field of valve manufacturing, the machining of the end face of the caliber of globe valves and three-way valves is one of the key technological processes. Usually, milling is required to ensure that the flatness, perpendicularity, and surface roughness of the end face meet the requirements. Most traditional fixtures are designed for a single valve body specification, with poor versatility. When machining valve bodies of different calibers or types, the fixtures need to be frequently replaced, resulting in low production efficiency and increased manufacturing costs. In addition, the angle adjustment function of traditional fixtures is limited, making it difficult to meet the machining requirements of special angles of valve bodies. Moreover, during high-speed milling, chip accumulation is likely to occur, affecting machining accuracy and tool life, and even possibly damaging the surface of the workpiece.

[0003] In the prior art, although some fixtures attempt to improve versatility through modular design, their structures are complex and the adjustment steps are cumbersome. The chip problem mostly relies on external blowing or dust suction devices to solve, which not only increases equipment costs but also may cause machining interruptions due to poor chip evacuation.

[0004] Therefore, there is an urgent need for a new type of fixture that can quickly adapt to different specifications of three-way valves, flexibly adjust the machining angle, and effectively solve the problem of chip accumulation, thereby improving machining efficiency and product quality.

[0005] Therefore, it is necessary to invent a fixture for milling the end face of the caliber of a globe valve to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a fixture for milling the end face of the caliber of a globe valve. By aligning the output port of the support assembly with the position of the milling tool, and then installing the valve body workpiece between the adjustment components inside the support assembly, starting the electric push rod to drive the upper pressing plate and the lower pressing plate to approach each other to clamp the valve body workpiece, and then starting the rotating motor to drive the whole C-shaped plate to flip, so as to machine different end faces of the valve body workpiece. It has strong adaptability, does not require separate turning over, and is applicable to valve body workpieces of various specifications, so as to solve the problems of complex structure and cumbersome adjustment steps in the prior art; the chip problem mostly relies on external blowing or dust suction devices to solve, which not only increases equipment costs but also may cause machining interruptions due to chip accumulation inside the workpiece.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A fixture for milling the end face of the caliber of a globe valve, including a support assembly, and the support assembly is used to support the device; the support assembly includes a base, and an installation vertical plate is fixedly installed on the top of the base; Rotating assembly, including a servo motor, the servo motor is installed outside the installation vertical plate, the output end of the servo motor penetrates through the installation vertical plate and is installed with an L-shaped plate, and a rotating motor is installed at the bottom of the L-shaped plate; Adjusting assembly, installed inside the L-shaped plate, including a C-shaped plate, the C-shaped plate is rotatably connected inside the L-shaped plate, the output end of the rotating motor penetrates through the L-shaped plate and is connected to the C-shaped plate, an electric push rod is fixedly installed at the top of the C-shaped plate, and an upper pressing plate and a lower pressing plate are slidably connected inside the C-shaped plate; Clamping power assembly, including a limit slide rail, the limit slide rail is opened on the inner wall of the C-shaped plate, and two transmission gears are rotatably connected inside the limit slide rail; Adaptive fixture head, used for clamping the valve body workpiece, three adaptive fixture heads are respectively connected to the sides of the upper pressing plate and the lower pressing plate, each adaptive fixture head includes a clamping block, and two first rotating wheels are slidably connected to the inner bottom of each clamping block, and two second rotating wheels are slidably connected to the inner bottom of the two first rotating wheels; As a preferred solution of the present invention, two baffles are fixedly connected to the top of the base, a circular protective cover is fixedly connected to the top of the two baffles, and a hinged door is hinged to one side of the top of the protective cover.

[0008] As a preferred solution of the present invention, the output end of the servo motor is fixedly connected with a power rotating rod through a coupling, a fan blade is fixedly connected to the outside of the power rotating rod, and the end of the power rotating rod penetrates through the protective cover and is fixedly connected with the L-shaped plate.

[0009] As a preferred solution of the present invention, the output end of the rotating motor is fixedly connected with the C-shaped plate through a coupling, the output end of the electric push rod penetrates through the C-shaped plate and is fixedly connected with the upper pressing plate, the upper pressing plate and the lower pressing plate are symmetrically distributed, and fixing rods are fixedly connected to the inner sides of the upper pressing plate and the lower pressing plate, and movable pressing rods are slidably connected to the outside of the fixing rods through springs.

[0010] As a preferred solution of the present invention, three fixing blocks are fixedly connected to the sides of the upper pressing plate and the lower pressing plate, a screw is rotatably connected to the outside of each fixing block, a plurality of limit sliding grooves are opened inside the upper pressing plate and the lower pressing plate, the plurality of limit sliding grooves cooperate with the screws, and the end of the screw is rotatably connected to the inner wall of the limit sliding groove.

[0011] As a preferred solution of the present invention, upper limit blocks are fixedly connected to both sides of the tail of the upper pressing plate, upper racks are fixedly connected to the bottom ends of the two upper limit blocks, lower limit blocks are fixedly connected to both sides of the tail of the lower pressing plate, lower racks are fixedly connected to the top ends of the two lower limit blocks, the upper racks and the lower racks correspond one by one, and a transmission gear is meshed between the upper rack and the lower rack.

[0012] As a preferred embodiment of the present invention, a plurality of clamping blocks are provided. The ends of the plurality of clamping blocks are fixedly connected with threaded blocks. Threaded holes are formed inside the threaded blocks. Each threaded hole is threadedly connected with a screw respectively. The threaded blocks are slidably connected with the limit sliding grooves. Both ends of the clamping blocks incline downward.

[0013] As a preferred embodiment of the present invention, two T-shaped first limit grooves are formed at the bottom of the clamping block. First limit rings are fixedly connected to the outer sides of the first rotating wheels. The first limit rings cooperate with the first limit grooves.

[0014] As a preferred embodiment of the present invention, two T-shaped second limit grooves are formed at the bottom of the first rotating wheel. Second limit rings are fixedly connected to the outer sides of the second rotating wheels. The second limit rings cooperate with the second limit grooves.

[0015] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows: When it is necessary to perform central clamping on the device, the user can start the electric push rod. The electric push rod pushes the upper pressure plate to descend, so that the upper limit block on the side of the upper pressure plate slides downward inside the limit slide rail. An upper rack is fixedly connected to the inner side of the limit slide rail. The upper rack drives the lower rack to move in the opposite direction through the transmission gear. Thus, the lower limit block is driven to move synchronously through the lower rack, and then the lower pressure plate is driven to rise inside the limit slide rail, so as to clamp the valve body workpiece. The user can adjust the distance of the fixture according to the size of the valve body workpiece. By rotating the screw, the screw drives the threaded block at the top of the clamping block to slide inside the limit slide groove, contracting inward or expanding outward, so as to adapt to different workpieces; When it is necessary to flip the valve body workpiece to process the other end face, the user can start the rotary motor. The rotary motor drives the U-shaped plate to rotate, so that the valve body workpiece inside the U-shaped plate rotates, making the other end face close to the milling tool. Then, the servo motor is driven to drive the valve body workpiece to rotate. The two powers do not affect each other, which is convenient for use. After the movable pressure rod contacts the valve body workpiece, the internal spring is squeezed, so that the movable pressure rod slides inward outside the fixed rod, which is convenient for squeezing the outside of the valve body workpiece to assist in clamping; By starting the servo motor, the servo motor drives the L-shaped plate to rotate, and drives the valve body workpiece to rotate through the L-shaped plate, so as to facilitate the processing of the valve body workpiece. The fan blades are installed on the outer side of the power rotating rod and rotate together with the power rotating rod. Under the action of the fan blades, the flying chips entering the fixture can be reduced. Through holes for entry are provided inside the protective cover and the installation vertical plate, which is convenient for air to enter the protective cover under the rotation of the fan blades to prevent the phenomenon of internal air flow disorder. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic three-dimensional structure diagram of the whole of the present invention; Figure 2 It is a schematic sectional structure diagram of the support assembly of the present invention; Figure 3 It is a schematic connection structure diagram of the rotating assembly and the adjusting assembly of the present invention; Figure 4 It is a schematic connection structure diagram of the adjusting assembly and the adaptive fixture head of the present invention; Figure 5 It is a schematic structure diagram of the adjusting assembly and the clamping power assembly of the present invention; Figure 6 It is of the present invention Figure 5 The enlarged structure diagram at A in; Figure 7 It is a schematic connection structure diagram of the adjusting assembly and the adaptive fixture head of the present invention; Figure 8 It is of the present invention Figure 7 The enlarged structure diagram at B in; Figure 9 It is a schematic exploded structure diagram of the adaptive fixture head of the present invention.

[0018] Description of the reference numerals: 001, support assembly; 002, rotating assembly; 003, adjusting assembly; 004, clamping power assembly; 005, adaptive fixture head; 006, valve body workpiece; 101, base; 102, baffle; 103, protective cover; 104, hinged door; 105, mounting vertical plate; 201, servo motor; 202, power rotating rod; 203, fan blade; 204, L-shaped plate; 205, rotating motor; 301, C-shaped plate; 302, electric push rod; 303, upper pressing plate; 304, lower pressing plate; 305, fixed rod; 306, movable pressing rod; 307, fixed block; 308, screw; 309, limit sliding groove; 401, limit sliding rail; 402, upper limit block; 403, upper rack; 404, lower limit block; 405, lower rack; 406, transmission gear; 501. Clamping block; 502. Threaded block; 503. Threaded hole; 504. First limiting groove; 505. First rotating wheel; 506. First limiting ring; 507. Second limiting groove; 508. Second rotating wheel; 509. Second limiting ring. Detailed implementation mode

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further introduced in detail below in conjunction with the accompanying drawings.

[0020] The present invention provides a fixture for milling the end face of a globe valve caliber as Figures 1-9 shown, including a support assembly 001 for supporting the device; the support assembly 001 includes a base 101, and a mounting vertical plate 105 is fixedly installed on the top of the base 101; A rotating assembly 002, including a servo motor 201, the servo motor 201 is installed on the outside of the mounting vertical plate 105, the output end of the servo motor 201 penetrates through the mounting vertical plate 105 and is installed with an L-shaped plate 204, and a rotating motor 205 is installed at the bottom of the L-shaped plate 204; An adjustment assembly 003 is installed inside the L-shaped plate 204, including a U-shaped plate 301, the U-shaped plate 301 is rotatably connected inside the L-shaped plate 204, the output end of the rotating motor 205 penetrates through the L-shaped plate 204 and is connected to the U-shaped plate 301, and an electric push rod 302 is fixedly installed on the top of the U-shaped plate 301. The inside of the U-shaped plate 301 is slidably connected with an upper pressing plate 303 and a lower pressing plate 304; A clamping power assembly 004, including a limiting slide rail 401, the limiting slide rail 401 is opened on the inner wall of the U-shaped plate 301, and two transmission gears 406 are rotatably connected inside the limiting slide rail 401. A cavity for the upper rack 403, the lower rack 405 and the transmission gear 406 to move is also provided inside the limiting slide rail 401; An adaptive fixture head 005 for clamping the valve body workpiece 006. Three adaptive fixture heads 005 are respectively connected to the sides of the upper pressing plate 303 and the lower pressing plate 304. Each adaptive fixture head 005 includes a clamping block 501. Two first rotating wheels 505 are slidably connected to the inner bottom of each clamping block 501, and two second rotating wheels 508 are slidably connected to the inner bottom of the two first rotating wheels 505; During specific use, the user places the device at the designated position for milling, then aligns the outlet of the support assembly 001 with the tool position for milling, and installs the valve body workpiece 006 between the adjustment components 003 inside the support assembly 001 to fixedly install the valve body workpiece 006. Since there are two or three end faces on the valve body workpiece 006, milling of different end faces is required, so the valve body workpiece 006 needs to be flipped. The user can start the electric push rod 302 to drive the upper pressing plate 303 and the lower pressing plate 304 to approach each other to clamp the valve body workpiece 006, and then start the rotating motor 205 to drive the whole C-shaped plate 301 to flip, so as to process different end faces of the valve body workpiece 006. It has strong adaptability, does not require separate turning over, and is applicable to valve body workpieces 006 of various specifications.

[0021] As a further optimization of the present invention, two baffles 102 are fixedly connected to the top of the base 101, and an annular protective cover 103 is fixedly connected to the tops of the two baffles 102. One side of the top of the protective cover 103 is hinged with a hinged door 104.

[0022] During use, the user blocks the flying chips generated during milling through the protective cover 103, which can prevent the flying chips from flying everywhere. The hinged door 104 can be opened to facilitate placing the valve body workpiece 006 inside.

[0023] Among them, the output end of the servo motor 201 is fixedly connected with a power rotating rod 202 through a coupling. A fan blade 203 is fixedly connected to the outside of the power rotating rod 202, and the end of the power rotating rod 202 penetrates through the protective cover 103 and is fixedly connected with an L-shaped plate 204.

[0024] By starting the servo motor 201, the servo motor 201 drives the L-shaped plate 204 to rotate, and drives the valve body workpiece 006 to rotate through the L-shaped plate 204, so as to facilitate the processing of the valve body workpiece 006. The fan blade 203 is installed on the outside of the power rotating rod 202 and rotates together with the power rotating rod 202. Under the action of the fan blade 203, the flying chips entering the fixture can be reduced. Through holes for entry are provided inside the protective cover 103 and the installation vertical plate 105, which facilitates the entry of air into the protective cover 103 under the rotation of the fan blade 203 to prevent the phenomenon of internal air flow disorder.

[0025] In the above structure, the output end of the rotating motor 205 is fixedly connected with the C-shaped plate 301 through a coupling. The output end of the electric push rod 302 penetrates through the C-shaped plate 301 and is fixedly connected with the upper pressing plate 303. The upper pressing plate 303 and the lower pressing plate 304 are symmetrically distributed. Fixed rods 305 are fixedly connected to the inner sides of the upper pressing plate 303 and the lower pressing plate 304, and movable pressing rods 306 are slidably connected to the outside of the fixed rods 305 through springs.

[0026] When it is necessary to flip the valve body workpiece 006 to machine the other end face, the user can start the rotating motor 205. The rotating motor 205 drives the C-shaped plate 301 to rotate, so that the valve body workpiece 006 inside the C-shaped plate 301 rotates, making the other end face close to the milling cutter. Then, drive the servo motor 201 to drive the valve body workpiece 006 to rotate. The two powers do not affect each other, which is convenient for use. After the movable pressure rod 306 contacts the valve body workpiece 006, it squeezes the internal spring, causing the movable pressure rod 306 to slide inward on the outside of the fixed rod 305, facilitating the extrusion of the outside of the valve body workpiece 006 and assisting in clamping.

[0027] Wherein, three fixing blocks 307 are fixedly connected to the sides of the upper pressing plate 303 and the lower pressing plate 304. A screw 308 is rotatably connected to the outside of each fixing block 307. A plurality of limiting sliding grooves 309 are provided inside the upper pressing plate 303 and the lower pressing plate 304. The plurality of limiting sliding grooves 309 cooperate with the screw 308, and the end of the screw 308 is rotatably connected to the inner wall of the limiting sliding groove 309.

[0028] The user can adjust the distance of the fixture according to the size of the valve body workpiece 006. By rotating the screw 308, the screw 308 drives the threaded block 502 at the top of the clamping block 501 to slide inside the limiting sliding groove 309, contracting inward or expanding outward, so as to adapt to different workpieces.

[0029] Furthermore, upper limiting blocks 402 are fixedly connected to both sides of the tail of the upper pressing plate 303. Upper rack bars 403 are fixedly connected to the bottoms of the two upper limiting blocks 402. Lower limiting blocks 404 are fixedly connected to both sides of the tail of the lower pressing plate 304. Lower rack bars 405 are fixedly connected to the tops of the two lower limiting blocks 404. The upper rack bars 403 and the lower rack bars 405 correspond one by one. A transmission gear 406 is meshed between the upper rack bar 403 and the lower rack bar 405.

[0030] When it is necessary to perform central clamping on the device, the user can start the electric push rod 302. The electric push rod 302 pushes the upper pressing plate 303 to descend, so that the upper limiting block 402 on the side of the upper pressing plate 303 slides downward inside the limiting slide rail 401. The inner side of the limiting slide rail 401 is fixedly connected with the upper rack bar 403. The upper rack bar 403 drives the lower rack bar 405 to move in the opposite direction through the transmission gear 406, so as to drive the lower limiting block 404 to move synchronously through the lower rack bar 405, and then drive the lower pressing plate 304 to rise inside the limiting slide rail 401, thereby clamping the valve body workpiece 006. Among them, a plurality of clamping blocks 501 are provided. The ends of the plurality of clamping blocks 501 are fixedly connected with threaded blocks 502. Threaded holes 503 are formed inside the threaded blocks 502. Each threaded hole 503 is threadedly connected with a screw 308 respectively. The threaded blocks 502 are slidably connected with the limit sliding grooves 309. Both ends of the clamping blocks 501 incline downward.

[0031] The threaded hole 503 is threadedly connected with the screw 308. When the screw 308 rotates, it can drive the threaded block 502 to move, so that the threaded block 502 slides inside the limit sliding groove 309, and can be adaptively adjusted according to the size of the workpiece.

[0032] In further optimization of the above embodiment, two T-shaped first limit grooves 504 are formed at the bottom of the clamping block 501. First limit rings 506 are fixedly connected to the outer sides of the first rotating wheels 505. The first limit rings 506 cooperate with the first limit grooves 504. Among them, two T-shaped second limit grooves 507 are formed at the bottom of the first rotating wheels 505. Second limit rings 509 are fixedly connected to the outer sides of the second rotating wheels 508. The second limit rings 509 cooperate with the second limit grooves 507.

[0033] When the second rotating wheel 508 contacts the valve body workpiece 006, the second rotating wheel 508 can adaptively adjust the angle according to the shape of the valve body workpiece 006, so that the second rotating wheel 508 fits the valve body workpiece 006. Among them, the second limit ring 509 on the outer side of the second rotating wheel 508 rotates inside the second limit groove 507, which is convenient for limiting the second rotating wheel 508. The first rotating wheel 505 can adaptively adjust the angle according to the shape of the valve body workpiece 006, so that the second rotating wheel 508 fits the valve body workpiece 006 more closely. Among them, the first limit ring 506 on the outer side of the first rotating wheel 505 rotates inside the first limit groove 504, which is convenient for limiting the first rotating wheel 505.

[0034] It should be noted that the rotary motor 205 and the electric push rod 302 are both powered by a battery, so there is no need to connect external wires to prevent winding.

[0035] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A fixture for milling the end face of a globe valve caliber, comprising a support assembly (001), characterized in that: The support assembly (001) is used to support the device; the support assembly (001) includes a base (101), and a mounting vertical plate (105) is fixedly installed on the top of the base (101); A rotation assembly (002), which includes a servo motor (201), the servo motor (201) is installed on the outside of the mounting vertical plate (105), the output end of the servo motor (201) penetrates through the mounting vertical plate (105) and is installed with an L-shaped plate (204), and a rotation motor (205) is installed at the bottom of the L-shaped plate (204); An adjustment assembly (003), which is installed inside the L-shaped plate (204), includes a C-shaped plate (301), the C-shaped plate (301) is rotatably connected inside the L-shaped plate (204), the output end of the rotation motor (205) penetrates through the L-shaped plate (204) and is connected to the C-shaped plate (301), an electric push rod (302) is fixedly installed on the top of the C-shaped plate (301), and an upper pressure plate (303) and a lower pressure plate (304) are slidably connected inside the C-shaped plate (301); A clamping power assembly (004), which includes a limit slide rail (401), the limit slide rail (401) is opened on the inner wall of the C-shaped plate (301), and two transmission gears (406) are rotatably connected inside the limit slide rail (401); An adaptive fixture head (005) is used to clamp a valve body workpiece (006). Three adaptive fixture heads (005) are respectively connected to the sides of the upper pressure plate (303) and the lower pressure plate (304). Each adaptive fixture head (005) includes a clamping block (501). Two first rotating wheels (505) are slidably connected to the inner bottom of each clamping block (501), and two second rotating wheels (508) are slidably connected to the inner bottoms of the two first rotating wheels (505).

2. The fixture for milling the end face of the diameter of a globe valve according to claim 1, wherein: Two baffles (102) are fixedly connected to the top of the base (101), and an annular protective cover (103) is fixedly connected to the tops of the two baffles (102). A hinged door (104) is hinged to one side of the top of the protective cover (103).

3. A fixture for milling the end face of a globe valve caliber according to claim 1, characterized in that: The output end of the servo motor (201) is fixedly connected with a power rotating rod (202) through a coupling. A fan blade (203) is fixedly connected to the outside of the power rotating rod (202). The end of the power rotating rod (202) penetrates through the protective cover (103) and is fixedly connected to the L-shaped plate (204).

4. A fixture for milling the end face of a globe valve caliber, according to claim 1, characterized in that: The output end of the rotation motor (205) is fixedly connected with the C-shaped plate (301) through a coupling. The output end of the electric push rod (302) penetrates through the C-shaped plate (301) and is fixedly connected with the upper pressure plate (303). The upper pressure plate (303) and the lower pressure plate (304) are symmetrically distributed. Fixed rods (305) are fixedly connected to the inner sides of the upper pressure plate (303) and the lower pressure plate (304). Movable pressure rods (306) are slidably connected to the outside of the fixed rods (305) through springs.

5. A fixture for milling the end face of a globe valve caliber, as described in claim 1, characterized in that: Three fixing blocks (307) are fixedly connected to the sides of the upper pressing plate (303) and the lower pressing plate (304). A screw (308) is rotatably connected to the outside of each fixing block (307). A plurality of limiting sliding grooves (309) are formed inside the upper pressing plate (303) and the lower pressing plate (304). The plurality of limiting sliding grooves (309) cooperate with the screws (308), and the end of the screw (308) is rotatably connected to the inner wall of the limiting sliding groove (309).

6. A fixture for milling the end face of a globe valve caliber, according to claim 1, wherein: Upper limiting blocks (402) are fixedly connected to both sides of the tail of the upper pressing plate (303). Upper racks (403) are fixedly connected to the bottoms of the two upper limiting blocks (402). Lower limiting blocks (404) are fixedly connected to both sides of the tail of the lower pressing plate (304). Lower racks (405) are fixedly connected to the tops of the two lower limiting blocks (404). The upper racks (403) and the lower racks (405) correspond one by one, and a transmission gear (406) is meshed between the upper rack (403) and the lower rack (405).

7. A fixture for milling the end face of a globe valve caliber according to claim 1, characterized in that: A plurality of clamping blocks (501) are provided. Threaded blocks (502) are fixedly connected to the ends of the plurality of clamping blocks (501). Threaded holes (503) are formed inside the threaded blocks (502). Each threaded hole (503) is threadedly connected to a screw (308). The threaded blocks (502) are slidably connected to the limiting sliding grooves (309). Both ends of the clamping block (501) are inclined downward.

8. A fixture for milling the end face of a globe valve caliber according to claim 1, characterized in that: Two T-shaped first limiting grooves (504) are formed at the bottom of the clamping block (501). First limiting rings (506) are fixedly connected to the outside of the first rotating wheels (505). The first limiting rings (506) cooperate with the first limiting grooves (504).

9. A fixture for milling the end face of a globe valve caliber according to claim 1, characterized in that: Two T-shaped second limiting grooves (507) are formed at the bottom of the first rotating wheel (505). Second limiting rings (509) are fixedly connected to the outside of the second rotating wheels (508). The second limiting rings (509) cooperate with the second limiting grooves (507).

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