Positioning clamp for casting turning

Abstract

The utility model discloses a positioning clamp for casting turning, belongs to the technical field of hydro-generator casting machining, and aims to solve the problems that in the prior art, as hydro-generator castings are different in shape, a chuck of the positioning clamp cannot be replaced according to different casting shapes, and the machining efficiency is high. The problems that a fixed chuck can only clamp castings of matched types and is difficult to perfectly fit with other castings of special shapes, so that key parts of the castings cannot be accurately positioned in the clamping process, and positioning deviations occur frequently are solved. Comprising a base, mounting mechanisms are arranged on the periphery of the upper portion of the base, a fixed mounting frame is fixedly arranged on the upper portion of the base, a limiting fixing sleeve is fixedly arranged in the middle of the upper portion of the fixed mounting frame, a portable replacement mechanism is jointly mounted on the inner portion and the outer portion of the fixed mounting frame, a mounting block is embedded in the middle of the limiting fixing sleeve, and a chuck is fixedly arranged on the upper portion of the mounting block; the portable replacement mechanism comprises a preset guide groove.

Description

Technical Field

[0001] This utility model belongs to the field of hydro-generator casting processing technology, specifically relating to a positioning fixture for casting turning. Background Technology

[0002] Hydroelectric generator castings come in various shapes and types, such as turbine runner castings, valve body castings, cylinder block castings, and other castings. Each casting is further divided into different categories, and positioning fixtures are required during the turning process of these castings.

[0003] In the use of existing positioning clamps, due to the various shapes of hydro generator castings, the clamping plates of the positioning clamps cannot be changed according to the different shapes of the castings. As a result, the fixed clamping plates can only be used to clamp castings of the same type, making it difficult to perfectly fit with castings of other special shapes. Consequently, it is impossible to accurately position the key parts of the castings during the clamping process, resulting in frequent positioning deviations. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a positioning fixture for casting turning. This fixture aims to solve the problem that, due to the diverse shapes of hydro-generator castings, the clamping plates of the positioning fixture cannot be changed according to the different shapes of the castings. Consequently, the fixed clamping plates can only be used to clamp castings of a specific type, making it difficult to perfectly fit other castings with special shapes. This results in the inability to accurately position key parts of the casting during clamping, leading to frequent positioning deviations.

[0006] (2) Technical solution

[0007] To solve the above-mentioned technical problems, this utility model provides a positioning fixture for turning castings, including a base, an installation mechanism distributed around the upper periphery of the base, and a fixed bracket fixedly mounted on the upper part of the base. A limiting sleeve is fixedly mounted in the upper center of the fixed bracket. A portable replacement mechanism is jointly installed inside and outside the fixed bracket. A mounting block is embedded in the center of the limiting sleeve, and a clamping plate is fixedly mounted above the mounting block. The portable replacement mechanism includes a preset guide groove, which is distributed above the fixed bracket. A linkage clamping assembly is installed in the center of the fixed bracket. The linkage clamping assembly includes a transmission screw, and a limiting component is installed at one end of the transmission screw.

[0008] Furthermore, the linkage clamping assembly includes positive and negative lead screws, and a first bevel gear is fixedly provided on one side of the middle section of the positive and negative lead screws. Second bevel gears mesh with both sides of the first bevel gear, and a transmission lead screw is fixedly provided in the middle of the two second bevel gears. Lead screw sleeves are screwed around the periphery of the middle sides of the positive and negative lead screws and one side of each of the two transmission lead screws. Fixed guide blocks are fixed around the periphery of the four lead screw sleeves. Limiting posts are fixed on the inner side of the upper section of the four fixed guide blocks, and limiting grooves are provided around the periphery of the mounting blocks.

[0009] Furthermore, the fixed guide block and the preset guide groove are connected by a movable guide connection.

[0010] Furthermore, the top dimension of the limiting post matches the opening dimension of the limiting groove.

[0011] Furthermore, the limiting component includes a torsion block, which is fixed to one end of the transmission screw. A rotating sleeve is installed around one section of the transmission screw, and the rotating sleeve is provided with movable grooves around its periphery. A threaded guide sleeve is slidably provided around the movable grooves, and a preset threaded groove is provided on one side of the fixed bracket.

[0012] Furthermore, the threaded guide sleeve and the movable groove around the rotating sleeve are connected by a movable guide.

[0013] Furthermore, the threaded guide sleeve and the preset threaded groove are fixedly connected by threads.

[0014] Furthermore, the mounting mechanism includes screw grooves, which are distributed around the upper periphery of the base, and bolt rods are screwed into the middle of the plurality of screw grooves.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] When this utility model involves castings with special shapes that cannot be clamped by the chuck, the operator can manually guide the threaded sleeve in advance, allowing it to disengage from the pre-set threaded groove on one side of the fixed bracket through the thread. This indirectly disengages the forward and reverse screws from their limits. At this time, the operator can rotate the forward and reverse screws to make the first bevel gear fixed to them rotate synchronously. In this state, the second bevel gears on both sides meshing with the gears can synchronously rotate their respective fixed transmission screws. Thus, the two pairs of screw sleeves set on both sides of the forward and reverse screws and on the opposite sides of the two transmission screws can perform their respective relative movements according to the thread transmission. At this moment, the limiting post on the inner side of the fixed guide block set above the two pairs of screw sleeves can synchronously disengage from the mounting block at the bottom of the chuck. Thus, the chuck and mounting block can be disengaged from the base. The operator can then replace the chuck with one corresponding to the special shape casting. This is portable and practical, and also improves the machining adaptability of the fixture to a certain extent.

[0018] With this invention, the operator can pre-install the positioning fixture base on the worktable assembly area of ​​the lathe using four sets of screw slots and bolt rods, thereby ensuring that the chuck mounted on the fixture maintains the correct relative position with the lathe spindle during the turning process, thus ensuring the machining accuracy of the hydro-generator casting held in the chuck. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the three-dimensional assembly structure of this utility model;

[0021] Figure 2 This is a schematic diagram of a three-dimensional, disassembled structure;

[0022] Figure 3 This is a partial structural diagram of the linkage clamping assembly;

[0023] Figure 4 for Figure 2 Schematic diagram of the structure at point A in the middle.

[0024] The labels in the attached diagram are as follows: 1. Base; 2. Mounting mechanism; 21. Threaded groove; 22. Bolt rod; 3. Fixed bracket; 4. Limiting sleeve; 5. Portable replacement mechanism; 51. Pre-set guide groove; 52. Linkage clamping assembly; 521. Positive and negative lead screws; 522. First bevel gear; 523. Second bevel gear; 524. Transmission lead screw; 525. Lead screw sleeve; 526. Fixed guide block; 527. Limiting post; 528. Limiting groove; 53. Limiting assembly; 531. Torsion block; 532. Rotating sleeve; 533. Movable groove; 534. Threaded guide sleeve; 535. Pre-set threaded groove; 6. Mounting block; 7. Clamping plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This specific embodiment is a positioning fixture for turning castings, and its structural schematic diagram is shown below. Figures 1 to 4As shown, the fixture includes a base 1, with mounting mechanisms 2 distributed around the upper periphery of the base 1, and a fixed mounting bracket 3 fixedly mounted above the base 1. A limiting sleeve 4 is fixedly mounted in the upper center of the fixed mounting bracket 3. A portable replacement mechanism 5 is installed both inside and outside the fixed mounting bracket 3. A mounting block 6 is embedded in the center of the limiting sleeve 4, and a chuck 7 is fixedly mounted above the mounting block 6. The mounting mechanism 2 includes screw grooves 21, which are distributed around the upper periphery of the base 1. Bolt rods 22 are screwed into the center of multiple screw grooves 21. The operator can use four sets of screw grooves 21 and bolt rods 22 to pre-install the positioning fixture base 1 stably on the worktable assembly area of ​​the lathe, thereby ensuring that the chuck 7 mounted on the fixture maintains the correct relative position with the lathe spindle during the turning process, thus ensuring the machining accuracy of the hydro-generator casting held in the chuck 7.

[0027] The portable replacement mechanism 5 includes a preset guide groove 51, which is located above the fixed mounting bracket 3. A linkage clamping assembly 52 is installed in the middle of the fixed mounting bracket 3. The linkage clamping assembly 52 includes a forward and reverse lead screw 521. A first bevel gear 522 is fixedly mounted on one side of the middle section of the forward and reverse lead screw 521. Second bevel gears 523 mesh with both sides of the first bevel gear 522. A transmission lead screw 524 is fixedly mounted in the middle of the two second bevel gears 523. Lead screw sleeves 525 are screwed onto the periphery of both sides of the middle section of the forward and reverse lead screw 521 and one side of each of the two transmission lead screws 524. The periphery of the four lead screw sleeves 525 is fixedly mounted with… Fixed guide blocks 526 are connected to preset guide grooves 51 via a movable guide connection. Limiting posts 527 are fixedly mounted on the inner upper section of the four fixed guide blocks 526. Limiting grooves 528 are provided around the periphery of the mounting block 6. The top dimension of the limiting posts 527 matches the opening dimension of the limiting grooves 528. A limiting component 53 is installed at one end of the transmission screw 524. The limiting component 53 includes a torsion block 531, which is fixed to one end of the transmission screw 524. A rotating sleeve 532 is installed around one section of the transmission screw 524, and a movable groove 533 is provided around the periphery of the rotating sleeve 532. Threaded guides slide around the periphery of the movable groove 533. The threaded guide sleeve 534 and the movable groove 533 around the rotating sleeve 532 are connected in a movable guide connection. A preset threaded groove 535 is provided on one side of the fixed mounting bracket 3. The threaded guide sleeve 534 and the preset threaded groove 535 are connected in a threaded fixed connection. When the chuck 7 cannot accommodate a special-shaped casting, the operator can manually release the threaded guide sleeve 534 beforehand, allowing it to disengage from the preset threaded groove 535 on one side of the fixed mounting bracket 3 via the thread. This indirectly allows the positive and negative screws 521 to disengage from their limit positions. At this time, the operator can rotate the positive and negative screws 521 to make the first bevel gear 522 fixed to it rotate synchronously. In this state, it is in harmony with... The second bevel gears 523 on both sides of the gear meshing can synchronously drive their respective fixed transmission screws 524 to rotate. As a result, the two pairs of screw sleeves 525, which are respectively set on both sides of the positive and negative screws 521 and on the opposite sides of the two transmission screws 524, can perform their respective relative movements according to the thread transmission. At this time, the limiting post 527 on the inner side of the fixed guide block 526 set above the two pairs of screw sleeves 525 can synchronously disengage from the mounting block 6 at the bottom of the chuck 7. Thus, the chuck 7 and the mounting block 6 can be disengaged from the base 1. At this time, the personnel can replace the chuck 7 with a special-shaped casting. It is portable and practical, and also improves the processing adaptability of the fixture to a certain extent.

[0028] Working principle: Operators can pre-install the positioning fixture base 1 stably on the lathe's worktable assembly area using four sets of threaded slots 21 and bolt rods 22. This ensures that the chuck 7 mounted on the fixture maintains the correct relative position with the lathe spindle during turning, thus guaranteeing the machining accuracy of the hydro-generator casting held in the chuck 7. Secondly, when the chuck 7 cannot accommodate castings of special shapes, operators can manually guide the threaded guide sleeve 534 beforehand, allowing it to disengage from the pre-set threaded slot 535 on one side of the fixed bracket 3 via the threaded connection. This indirectly disengages the forward and reverse threaded rods 521 from their limit positions. At this time, operators can rotate the forward and reverse threaded rods 521 to release the first conical... When gear 522 rotates synchronously, the second bevel gears 523 on both sides meshing with it can synchronously drive their respective fixed transmission screws 524 to rotate. As a result, the two pairs of screw sleeves 525, which are respectively located on both sides of the positive and negative screws 521 and on the opposite sides of the two transmission screws 524, can perform their respective relative movements according to the thread transmission. At this moment, the limiting post 527 on the inner side of the fixed guide block 526 above the two pairs of screw sleeves 525 can synchronously disengage from the mounting block 6 at the bottom of the chuck 7. Thus, the chuck 7 and the mounting block 6 can be disengaged from the base 1. At this time, the personnel can replace the chuck 7 with a special-shaped casting. It is portable and practical, and also improves the processing adaptability of the fixture to a certain extent.

[0029] All technical features in this embodiment can be freely combined according to actual needs.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for turning castings, comprising a base (1), characterized in that, The base (1) is provided with an installation mechanism (2) on its upper periphery, and a fixed bracket (3) is fixedly provided on the upper part of the base (1). A limiting sleeve (4) is fixedly provided in the upper middle part of the fixed bracket (3). A portable replacement mechanism (5) is installed on the inner and outer sides of the fixed bracket (3). A mounting block (6) is embedded in the middle part of the limiting sleeve (4), and a clamping plate (7) is fixedly provided on the upper part of the mounting block (6). The portable replacement mechanism (5) includes a preset guide groove (51), and the preset guide groove (51) is located above the fixed bracket (3). A linkage clamping assembly (52) is installed in the middle part of the fixed bracket (3). The linkage clamping assembly (52) includes a transmission screw (524), and a limiting component (53) is installed at one end of the transmission screw (524).

2. The positioning fixture for turning castings according to claim 1, characterized in that, The linkage clamping assembly (52) includes a positive and negative lead screw (521), and a first bevel gear (522) is fixedly provided on one side of the middle section of the positive and negative lead screw (521). Second bevel gears (523) mesh on both sides of the first bevel gear (522), and a transmission lead screw (524) is fixedly provided in the middle of the two second bevel gears (523). Lead screw sleeves (525) are screwed around the middle sides of the positive and negative lead screw (521) and one side of each of the two transmission lead screws (524). Fixed guide blocks (526) are fixed around the four lead screw sleeves (525). Limiting posts (527) are fixed on the inner side of the upper section of the four fixed guide blocks (526). Limiting grooves (528) are provided around the mounting block (6).

3. A positioning fixture for turning castings according to claim 2, characterized in that, The fixed guide block (526) and the preset guide groove (51) are connected by a movable guide.

4. A positioning fixture for turning castings according to claim 2, characterized in that, The top dimension of the limiting post (527) matches the opening dimension of the limiting groove (528).

5. A positioning fixture for turning castings according to claim 1, characterized in that, The limiting component (53) includes a torsion block (531), and the torsion block (531) is fixed to one end of the transmission screw (524). A rotating sleeve (532) is installed around a section of the transmission screw (524), and a movable groove (533) is provided around the rotating sleeve (532). A threaded guide sleeve (534) is slidably provided around the movable groove (533). A preset threaded groove (535) is provided on one side of the fixed bracket (3).

6. A positioning fixture for turning castings according to claim 5, characterized in that, The threaded guide sleeve (534) and the movable groove (533) around the rotating sleeve (532) are connected by a movable guide.

7. A positioning fixture for turning castings according to claim 5, characterized in that, The threaded guide sleeve (534) and the preset threaded groove (535) are fixedly connected by threads.

8. A positioning fixture for turning castings according to claim 1, characterized in that, The installation mechanism (2) includes a screw groove (21), and the screw grooves (21) are distributed around the upper periphery of the base (1), and a bolt rod (22) is screwed into the middle of the plurality of screw grooves (21).

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