Adjustable valve shell part machining clamp

Abstract

The utility model relates to the technical field of clamps, in particular to an adjustable valve shell part machining clamp which comprises a base plate. The positioning mechanism is used for clamping the outer circle of the valve shell and positioning the center of the valve shell, and the positioning mechanism is arranged on the base plate; and the pressing and fixing mechanism is used for pressing the inner circle of the valve shell and fixing the valve shell under the cooperation of the positioning mechanism, the pressing and fixing mechanism is arranged on the base plate and comprises a connecting base and a pressing assembly, and the pressing assembly is rotationally connected with the connecting base. The pressing and fixing mechanism has certain self-adaptability, when the pressing and fixing mechanism is stressed, the pressing assembly can correspondingly adjust the range of contact with the inner circle of the valve shell in a self-adaptive mode so as to achieve the purpose of stable and reliable contact, through cooperation of the pressing and fixing mechanism and the positioning mechanism, clamping and working of valve shells of multiple specifications can be achieved, and the application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a fixture for machining adjustable valve body parts. Background Technology

[0002] In machining, V-blocks / guards are commonly used to hold circular workpieces such as shafts, sleeves, and discs. The contact between the workpiece's outer diameter and the V-groove determines its center position, facilitating the finding of the center line and subsequent positioning and machining. Clamping, on the other hand, applies external force based on positioning to hold the workpiece in a fixed position during machining, preventing movement. National standards also specify the appropriate V-block / guard specifications for machining or testing parts of different nominal diameters, allowing for selection based on actual needs.

[0003] In actual machining, a single specification of V-block / frame is often unsuitable for positioning various circular parts, especially when the nominal diameter varies significantly. It is necessary to change to a suitable specification of V-block / frame before machining, based on standard requirements. Furthermore, the clamping of circular workpieces is limited by their shape and size, requiring frequent matching and replacement. For some large nominal diameter outer circular workpieces, either a clamping fixture corresponding to the positioning V-block / frame is used for clamping on the outer circle, or a pressure plate is used to clamp through the inner wall. The former often involves larger fixtures, affecting the overall machining of the workpiece, while the latter uses a flat pressure plate that only contacts the inner hole along two edges, making clamping unreliable and also affecting subsequent machining.

[0004] Among them, valve body parts are typical examples, and the problems they face are very similar. Therefore, solving the problem of rapid and effective positioning and clamping of such parts is an urgent issue that needs to be addressed. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the fact that V-blocks / frames in the prior art are often difficult to be used for positioning various round parts, especially when the nominal diameter difference is large, and it is necessary to replace the V-blocks / frames with appropriate specifications according to standard requirements for positioning before processing, an adjustable valve body part processing fixture is provided.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a machining fixture for adjustable valve body parts, comprising:

[0007] substrate;

[0008] A positioning mechanism is used to clamp the outer circle of the valve housing and position the center of the valve housing. The positioning mechanism is arranged on the base plate.

[0009] And the pressing mechanism is arranged on the base plate, and the pressing mechanism comprises a connecting seat and a pressing assembly, the pressing assembly and the connecting seat are rotationally connected, when the pressing mechanism is used for pressing and fixing the valve shell, the pressing force makes the pressing assembly rotate and abut the inner circle of the valve shell, through the design that the pressing assembly and the connecting seat are rotationally connected, the pressing mechanism has certain self-adaptability, when force is borne, the pressing assembly can be adjusted in the corresponding adjustment range, the contact range with the inner circle of the valve shell can be adaptively adjusted, so that stable and reliable contact is achieved, and through cooperation of the pressing mechanism and the positioning mechanism, the valve shells of multiple specifications can be clamped and started, and the application range is wide.

[0010] In order to understand how the positioning mechanism realizes the clamping of the valve shell parts, the positioning mechanism further comprises a rotating hand wheel, a base, a lead screw and two positioning blocks, the lead screw has two thread segments with opposite screw directions, one of the two positioning blocks is threadedly connected with one of the thread segments of the lead screw, the other of the two positioning blocks is threadedly connected with the other thread segment of the lead screw, the lead screw is rotationally connected with the base, the rotating hand wheel is fixedly connected with the lead screw, and the base is fixedly connected with the base plate.

[0011] In order to solve the problem of unstable positioning of the valve shell parts, the positioning blocks are further provided with positioning surfaces that are inclined downward from the base end to the center.

[0012] In order to solve the problem of how the pressing assembly is rotationally connected with the connecting seat, the pressing assembly comprises a primary pressing plate, a primary guide rail, a secondary pressing plate and a secondary guide rail, the primary guide rail and the secondary guide rail are both in arc-shaped structures, the connecting seat is provided with a primary rotation groove for accommodating the primary pressing plate, the primary guide rail is arranged in the primary rotation groove and is fixedly connected with the connecting seat, the primary pressing plate is provided with a primary guide groove matched with the primary guide rail, and the primary guide rail is arranged in the primary guide groove.

[0013] The primary pressing plate is provided with a secondary rotation groove for accommodating the secondary pressing plate, the secondary guide rail is arranged in the secondary rotation groove and is fixedly connected with the primary pressing plate, the secondary pressing plate is provided with a secondary guide groove matched with the secondary guide rail, and the secondary guide rail is arranged in the secondary guide groove.

[0014] In order to solve the problem that the primary pressing plate and the secondary pressing plate are easy to be separated from the installed positions after excessive rotation, the pressing assembly further comprises a primary limiting pin and a secondary limiting pin, the primary guide rail is provided with a primary limiting hole, the primary limiting pin is threadedly connected with the primary pressing plate and extends into the primary limiting hole.

[0015] The secondary guide rail is provided with a secondary limiting hole, the secondary limiting pin is threadedly connected with the secondary pressing plate and extends into the secondary limiting hole.

[0016] In order to solve the problem that the direct contact between the primary pressing plate or the secondary pressing plate and the valve shell part causes scratches on the contact surface of the valve shell, the further comprising the pressing assembly comprises a protection block, the protection block and the secondary pressing plate are fixedly connected, and the protection block is used for contacting the valve shell.

[0017] In order to solve the problem of how to drive the pressing mechanism and the valve shell, the further comprising the machining clamp further comprises a pressing mechanism for applying pressure to the pressing mechanism, the pressing mechanism comprises a cylinder body, a piston, a piston rod, a bearing follower and a pressing plate, the cylinder body and the base plate are fixedly connected, the piston is slidably arranged in the cylinder body, one end of the piston rod and the piston are fixedly connected, the other end of the piston rod passes through the cylinder body and extends to the outside of the cylinder body and is fixedly connected with the pressing plate, the bearing follower is located in the cylinder body, and the bearing follower and the cylinder body are fixedly connected, a spiral groove and a vertical groove are formed on the piston rod, the spiral groove and the vertical groove are communicated, and the bearing end of the bearing follower is located in the spiral groove or the vertical groove.

[0018] In order to solve the problem that the valve shell lacks support on the base plate, and is easy to vibrate after the machining process, the further comprising a plurality of support plates arranged on the base plate for supporting the valve shell.

[0019] The beneficial effects of the utility model are: the utility model provides a machining clamp for valve shell parts, through the design that the pressing assembly and the connecting seat are rotationally connected, the pressing mechanism has certain self-adaptability, under stress, the pressing assembly can be adjusted in the corresponding range, can be adjusted adaptively with the contact range of the inner circle of the valve shell, to achieve the purpose of stable and reliable contact, and through the cooperation of the pressing mechanism and the positioning mechanism, the clamping and starting of valve shells of multiple specifications can be realized, and the application range is wide. ACCURATE DRAWINGS

[0020] The utility model is further described below in combination with the drawings and examples.

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0022] Figure 2 It is the overhead structure schematic diagram of the pressing mechanism of the utility model;

[0023] Figure 3 It is the explosion structure schematic diagram of the pressing mechanism of the utility model;

[0024] Figure 4 It is the structure schematic diagram of the positioning mechanism of the utility model;

[0025] Figure 5 It is the structure schematic diagram of the pressing mechanism of the utility model;

[0026] Figure 6 It is the front view structure schematic diagram of the pressing mechanism of the utility model;

[0027] Figure 7 is the sectional structure schematic diagram of the pressure applying mechanism of the utility model, and

[0028] Figure 8 is the structure schematic diagram of the piston and the piston rod of the utility model.

[0029] In the drawing: 1, base plate, 11, support plate;

[0030] 2, positioning mechanism, 21, rotating hand wheel, 22, base, 23, screw rod, 24, positioning block, 241, positioning surface;

[0031] 3, pressure fixing mechanism, 31, connecting seat, 311, primary rotating groove, 32, pressure assembly, 321, primary pressure plate, 3211, secondary rotating groove, 3212, primary guide groove, 322, primary guide rail, 3221, primary limiting hole, 323, secondary pressure plate, 3231, secondary guide groove, 324, secondary guide rail, 3241, secondary limiting hole, 325, primary limiting pin, 326, secondary limiting pin, 327, protection block;

[0032] 4, pressure applying mechanism, 41, cylinder body, 42, piston, 43, piston rod, 431, helical groove, 432, vertical groove, 44, bearing follower, 45, pressure applying plate;

[0033] 5, valve shell. DETAILED DESCRIPTION

[0034] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, so it only shows the structure related to the utility model.

[0035] As Figure 1 is the structure schematic diagram of the utility model, a kind of adjustable valve shell part machining clamp, comprising:

[0036] Base plate 1 it is used for mechanism installation, and base plate 1 is arranged with several support plate 11 for supporting valve shell 5;

[0037] As Figure 4As shown, the positioning mechanism 2 for clamping the outer circle of the valve shell 5 and positioning the center of the valve shell, the positioning mechanism 2 is arranged on the base plate 1; The positioning mechanism 2 comprises a rotating hand wheel 21, a base 22, a lead screw 23, and two positioning blocks 24, the lead screw 23 has two thread segments with opposite thread directions, one of the two positioning blocks 24 is threadedly connected with one of the thread segments on the lead screw 23, the other of the two positioning blocks 24 is threadedly connected with the other thread segment on the lead screw 23, the positioning block 24 has a threaded hole corresponding to the thread segment connected therewith, the lead screw 23 is rotationally connected with the base 22, the rotating hand wheel 21 is fixedly connected with the lead screw 23, and the base 22 is fixedly connected with the base plate 1; When the lead screw 23 rotates, the two positioning blocks 24 can approach or move away from each other, the lead screw 23 is a double-thread lead screw, and by adjusting the rotating hand wheel 21, different outer circle workpieces of different diameters can be positioned and aligned, and the positioning efficiency of workpieces of different specifications is improved.

[0038] The positioning mechanism 2 further comprises a locking screw corresponding to each positioning block 24, the locking screw is threadedly connected with the base 22, and when the positioning block 24 is fixed, the locking screw abuts against the positioning block 24, so that pressure is applied to make the positioning block 24 more stable after position confirmation.

[0039] In another embodiment, the rotating hand wheel 21 can be replaced by a motor, and the output shaft of the motor is drivingly connected with the lead screw 23 through a shaft coupling; The driving control structure of the lead screw 23 can also be transformed into a pneumatic control (air cylinder), a hydraulic control (hydraulic cylinder), and an electric control (electric push rod) to realize the same function.

[0040] The positioning block 24 has a positioning surface 241 inclined downward from the end of the base 22 to the center, so that the positioning block 24 has a V-shaped structure.

[0041] As shown in Figure 1 , 2 The pressure fixing mechanism 3 for pressing the inner circle of the valve shell 5 and fixing the valve shell 5 under the cooperation of the positioning mechanism 2, the pressure fixing mechanism 3 is arranged on the base plate 1, the pressure fixing mechanism 3 comprises a connecting seat 31 and a pressing assembly 32, the pressing assembly 32 is rotationally connected with the connecting seat 31, when the pressure fixing mechanism 3 tightly fixes the valve shell 5, the pressing force makes the pressing assembly 32 rotate and adhere to the inner circle of the valve shell 5, through the design that the pressing assembly 32 is rotationally connected with the connecting seat 31, the pressure fixing mechanism 3 has a certain self-adaptability, and when force is applied, the pressing assembly 32 can be adjusted in a corresponding range, so as to adaptively adjust the contact range with the inner circle of the valve shell, thereby achieving stable and reliable contact.

[0042] In the present application, two pressing assemblies 32 are provided, which facilitate the pressure fixing mechanism 3 to press the inner circle of the valve shell 5.

[0043] As shown in Figure 2 , 3As shown, the pressing assembly 32 comprises a first pressing plate 321, a first guide rail 322, a second pressing plate 323, and a second guide rail 324. The first guide rail 322 and the second guide rail 324 are in arc-shaped structures. A first rotating groove 311 for accommodating the first pressing plate 321 is formed in the connecting seat 31. The first guide rail 322 is arranged in the first rotating groove 311 and is fixedly connected with the connecting seat 31. The first pressing plate 321 is fixedly connected with the connecting seat 31 by means of bolts. The first pressing plate 321 is provided with a first guide groove 3212 matched with the first guide rail 322. The first guide groove 3212 is a dovetail groove. The first guide rail 322 is arranged in the first guide groove 3212.

[0044] A second rotating groove 3211 for accommodating the second pressing plate 323 is formed in the first pressing plate 321. The second guide rail 324 is arranged in the second rotating groove 3211 and is fixedly connected with the first pressing plate 321. The second pressing plate 323 is fixedly connected with the first pressing plate 321 by means of bolts. The second pressing plate 323 is provided with a second guide groove 3231 matched with the second guide rail 324. The second guide groove 3231 is a dovetail groove. The second guide rail 324 is arranged in the second guide groove 3231. The pressing assembly 32 of the present application adopts a two-stage fractal pressing plate. In actual use, the pressing plate can be further designed in a fractal manner when the machining conditions are met. The more the fractal stages are, the closer the structure is to the inner diameter, and the more reliable the clamping is.

[0045] The pressing assembly 32 comprises a first limiting pin 325 and a second limiting pin 326. A first limiting hole 3221 is formed in the first guide rail 322. The first limiting pin 325 is threadedly connected with the first pressing plate 321 and extends into the first limiting hole 3221. The first limiting hole 3221 extends along the extension direction of the first guide rail 322. The first limiting pin 325 and the first limiting hole 3221 cooperate to limit the rotation range of the first pressing plate 321, so as to avoid the first guide groove 3212 of the first pressing plate 321 from slipping off the first guide rail 322.

[0046] A second limiting hole 3241 is formed in the second guide rail 324. The second limiting hole 3241 extends along the extension direction of the second guide rail 324. The second limiting pin 326 is threadedly connected with the second pressing plate 323 and extends into the second limiting hole 3241. The second limiting hole 3241 and the second limiting pin 326 cooperate to limit the rotation range of the second pressing plate 323, so as to avoid the second guide groove 3231 of the second pressing plate 323 from slipping off the second guide rail 324.

[0047] The pressing assembly 32 comprises a protection block 327. The protection block 327 is fixedly connected with the second pressing plate 323. The protection block 327 is used to contact the valve shell 5. The protection block 327 is made of copper or other materials such as rubber, so as to avoid damaging the inner circle when contacting the valve shell.

[0048] As Figure 5 , 6 , 7, 8, the machining fixture further comprises a pressing mechanism 4 for applying pressure to the pressing mechanism 3, the pressing mechanism 4 comprises a cylinder body 41, a piston 42, a piston rod 43, a bearing follower 44 and a pressing plate 45, the cylinder body 41 and the base plate 1 are fixedly connected, the cylinder body 41 has an inner cavity, the cylinder body 41 is provided with an air hole communicating with the inner cavity, the piston 42 is arranged in the inner cavity of the cylinder body 41, the piston 42 is slidingly arranged in the cylinder body 41, one end of the piston rod 43 is fixedly connected with the piston 42, the other end of the piston rod 43 passes through the cylinder body 41 and extends to the outside of the cylinder body 41 and is fixedly connected with the pressing plate 45, the pressing plate 45 is used for abutting against the connecting seat 31 to apply pressure to the pressing mechanism 3, so that the pressing mechanism 3 tightly abuts against the inner circle of the valve shell 5, the bearing follower 44 is located in the cylinder body 41, and the bearing follower 44 and the cylinder body 41 are fixedly connected, the piston rod 43 is provided with a spiral groove 431 (also referred to as a curved groove) and a vertical groove 432, the spiral groove 431 extends along the circumference of the piston rod 43, the vertical groove 432 extends along the axis of the piston rod 43, the spiral groove 431 and the vertical groove 432 are communicated, the bearing end of the bearing follower 44 is located in the spiral groove 431 or the vertical groove 432, and the bearing follower 44 spirally moves in the spiral groove 431 of the piston rod 43, so that the piston rod 43 can rotate by 90° and move up and down to realize contraction and compression through the bearing follower 44 moving in the vertical groove 432, and the pressing plate 45 is fixedly installed on the top of the piston rod 43 through a check ring and a screw, and moves up and down and rotates with the piston rod 43.

[0049] In another embodiment, the pressing mechanism 4 can also be a rotating part (motor, rotating table, gear and rack mechanism, etc.) and a lifting driving part (air cylinder, electric push rod, etc.) arranged independently to realize the rotating and lifting functions, and the present application does not make specific limitation thereto.

[0050] Working mode: the valve shell 5 is placed on the base 22, and the valve shell 5 is located between the two positioning blocks 24, the two positioning blocks 24 are moved close to each other until the two positioning blocks 24 contact and abut against the outer circle of the valve shell 5 by rotating the hand wheel 21 to rotate the lead screw 23, the positioning of the valve shell 5 is completed through the spacing between the two positioning blocks 24, the positioning and alignment of the valve shell 5 are realized, and the support plate 11 on the base plate 1 is used for providing auxiliary support for the valve shell 5; then the pressing mechanism 3 is placed in the inner circle of the valve shell 5;

[0051] The cylinder body 41 controls the movement of the piston 42 through air supply and air extraction through the air hole, so as to control the movement of the pressing mechanism 3.

[0052] When the pressing mechanism 3 moves, the cylinder 1 is ventilated, the piston 42 moves upward, the piston rod 43 moves upward under the driving of the piston 42, at this time, the bearing follower 44 limits the movement of the piston rod 43 in the spiral groove 431, so that the piston rod 43 rotates, the piston rod 43 rotates 90°, so that the pressing plate 45 moves to the above of the connecting seat 31 of the pressing mechanism 3, then the pressing plate 45 moves downward again, and the pressing plate 45 applies pressure to the pressing mechanism 3, so that the pressing mechanism 3 is attached to the valve shell 5, and the pressing force is reacted to the pressing mechanism 3, so that the primary pressing plate 321 moves along the primary guide rail 3221 and the secondary pressing plate 323 moves along the secondary guide rail 324, and the two cooperate to adaptively adjust the angle of the secondary pressing plate 323, so that the protection block 327 on the secondary pressing plate 323 is attached to the inner wall of the valve shell 5, and the pressure on the pressing plate 45 is applied to the protection block 327 and then applied to the valve shell 5, and the protection block 327 of the pressing mechanism 3 and the two positioning blocks 24 cooperate to realize the positioning and fixing of the valve shell 5.

[0053] The above is the ideal embodiment of the present application, and the related personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. An adjustable valve shell part machining fixture, characterized by, The utility model relates to a valve shell positioning and fixing device, which comprises the following parts: a base plate (1); a positioning mechanism (2) arranged on the base plate (1) for clamping the outer circle of the valve shell and positioning the center of the valve shell; and a pressing mechanism (3) arranged on the base plate (1) for pressing the inner circle of the valve shell and fixing the valve shell under the cooperation of the positioning mechanism (2), wherein the pressing mechanism (3) comprises a connecting seat (31) and a pressing assembly (32) which are rotationally connected, and when the pressing mechanism (3) tightly presses the valve shell, the pressing force makes the pressing assembly (32) rotate and fit the inner circle of the valve shell.

2. An adjustable valve shell part machining fixture as claimed in claim 1, characterized in that: The positioning mechanism (2) comprises a rotating hand wheel (21), a base (22), a screw rod (23) and two positioning blocks (24), the screw rod (23) has two thread segments with opposite screw directions, one of the two positioning blocks (24) is threadedly connected with one of the thread segments of the screw rod (23), the other of the two positioning blocks (24) is threadedly connected with the other thread segment of the screw rod (23), the screw rod (23) is rotationally connected with the base (22), the rotating hand wheel (21) is fixedly connected with the screw rod (23), and the base (22) is fixedly connected with the base plate (1).

3. An adjustable valve shell part machining fixture as claimed in claim 2, characterized in that: The positioning block (24) has a positioning surface (241) which is inclined downward from the end of the base (22) to the center.

4. An adjustable valve shell part machining fixture as claimed in claim 1, characterized in that: The pressing assembly (32) comprises a primary pressing plate (321), a primary guide rail (322), a secondary pressing plate (323) and a secondary guide rail (324), the primary guide rail (322) and the secondary guide rail (324) are both in arc-shaped structures, the connecting seat (31) is provided with a primary rotation slot (311) for accommodating the primary pressing plate (321), the primary guide rail (322) is arranged in the primary rotation slot (311), and the primary guide rail (322) is fixedly connected with the connecting seat (31), the primary pressing plate (321) is provided with a primary guide groove (3212) matched with the primary guide rail (322), and the primary guide rail (322) is arranged in the primary guide groove (3212). The primary pressing plate (321) is provided with a secondary rotation slot (3211) for accommodating the secondary pressing plate (323), the secondary guide rail (324) is arranged in the secondary rotation slot (3211), and the secondary guide rail (324) is fixedly connected with the primary pressing plate (321), the secondary pressing plate (323) is provided with a secondary guide groove (3231) matched with the secondary guide rail (324), and the secondary guide rail (324) is arranged in the secondary guide groove (3231).

5. An adjustable valve shell part machining fixture as claimed in claim 4, characterized in that: The pressing assembly (32) comprises a primary limiting pin (325) and a secondary limiting pin (326), the primary guide rail (322) is provided with a primary limiting hole (3221), the primary limiting pin (325) is threadedly connected with the primary pressing plate (321), and the primary limiting pin (325) extends into the primary limiting hole (3221). The secondary guide rail (324) is provided with a secondary limiting hole (3241), the secondary limiting pin (326) and the secondary pressing plate (323) are threadedly connected, and the secondary limiting pin (326) extends into the secondary limiting hole (3241).

6. An adjustable valve shell part machining fixture as claimed in claim 4, characterized in that: The pressing assembly (32) comprises a protection block (327), the protection block (327) is fixedly connected with the secondary pressing plate (323), and the protection block (327) is used for contacting the valve shell.

7. An adjustable valve shell part machining fixture as defined in claim 1, wherein: The machining clamp further comprises a pressing mechanism (4) for applying pressure to the pressing mechanism (3), the pressing mechanism (4) comprises a cylinder (41), a piston (42), a piston rod (43), a bearing follower (44) and a pressing plate (45), the cylinder (41) is fixedly connected with the base plate (1), the piston (42) is slidingly arranged in the cylinder (41), one end of the piston rod (43) is fixedly connected with the piston (42), the other end of the piston rod (43) penetrates through the cylinder (41) and extends to the outside of the cylinder (41) and is fixedly connected with the pressing plate (45), the bearing follower (44) is located in the cylinder (41), and the bearing follower (44) is fixedly connected with the cylinder (41), a spiral groove (431) and a vertical groove (432) are formed in the piston rod (43), the spiral groove (431) and the vertical groove (432) are communicated, and a bearing end of the bearing follower (44) is located in the spiral groove (431) or the vertical groove (432).

8. An adjustable valve shell part machining fixture as defined in claim 1, wherein: The base plate (1) is provided with a plurality of support plates (11) for supporting the valve shell.

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