Lathe clamp capable of automatically taking middle part

Abstract

The utility model relates to the technical field of clamps, and discloses an automatic centering turning clamp which comprises a three-jaw chuck body, a fixing block is fixedly installed in the middle of the upper end of the three-jaw chuck body, adjusting lead screws are arranged at the two ends of the fixing block respectively, and the two adjusting lead screws are fixedly connected through a connecting shaft. The three-jaw chuck comprises a three-jaw chuck body and a connecting shaft, the connecting shaft penetrates through the fixed block and is rotationally connected with the fixed block, the outer surfaces of the two adjusting lead screws are sleeved with movable plates respectively, the movable plates are connected with the three-jaw chuck body in a sliding mode, and the upper ends of the movable plates are fixedly provided with center clamping plates. The clamping blocks are additionally arranged on the original chuck jaws, so that the clamping firmness of the emergency valve is improved, meanwhile, an automatic centering and positioning structure is additionally arranged in the center of the chuck, the emergency valve is quickly centered and positioned, and the stability of the upper half section of the emergency valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture, concretely to a car fixture of automatic centering. BACKGROUND

[0002] 120 emergency valve is important component in 120 automatic system, is 120 brake valve in emergency brake quicken train pipe exhaust (emergency local reduction effect), make emergency brake reliable, improve the sensitivity of emergency brake, thereby improve emergency brake wave speed.

[0003] The emergency valve body is composed of three flange shapes, and the first-order machining positioning is very important in the machining process. The existing emergency valve fixture usually adopts a three-jaw chuck. However, the existing three-jaw chuck cannot well meet the positioning requirements of the emergency valve. If the positioning is not accurate, it will affect the large deviation of the flange hole drilling from the blank shape in the subsequent flange hole drilling, and cannot meet the process requirements. Therefore, an automatic centering turning fixture is proposed. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of automatic centering turning fixtures, to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: an automatic centering turning fixture, including three-jaw chuck body, three three-jaw chuck body are provided with three chuck claws, three The chuck claws are annular array, the upper end middle part of the three-jaw chuck body is fixedly installed with fixed block, the both ends of the fixed block are provided with adjusting screw respectively, two The adjusting screw is fixedly connected by connecting shaft between two adjusting screw, the connecting shaft passes through the fixed block and is rotatably connected with fixed block, the outer surface of two The adjusting screw is respectively sleeved with movable plate, the movable plate is slidably connected with three-jaw chuck body, the upper end of the movable plate is fixedly installed with centering clamping plate.

[0006] As a further preferred embodiment of the present technical solution, one end of each of the two centering clamping plates that are close to each other is provided with a clamping groove.

[0007] As a further preferred embodiment of the present technical solution, the bottom of the movable plate is fixedly connected with a sliding block, and the sliding block is slidably installed in a sliding groove formed in the upper end of the three-jaw chuck body.

[0008] As a further preferred embodiment of the present technical solution, one end of each of the chuck claws close to the fixed block is fixedly connected with a clamping block, and the end of the clamping block close to the fixed block is provided with an arc surface.

[0009] As a further preferred embodiment of the present technical solution, a plurality of anti-slip grooves are formed on the arc surface of the clamping block.

[0010] As a further preferred technical solution of the present application, the two adjusting screw rods are respectively fixedly installed with adjusting rods at their ends away from each other, and the cross section of the adjusting rod is a regular hexagonal structure.

[0011] As a further preferred technical solution of the present application, the upper end edge of the three-jaw chuck body is provided with a plurality of fixing holes in a ring array.

[0012] The utility model provides a kind of automatic centering vehicle clamp, with the following beneficial effects:

[0013] The utility model discloses a three-jaw chuck is improved by adding clamping block on original chuck claw to the traditional 260 three-jaw chuck, so as to improve the clamping firmness of emergency valve, meanwhile, the structure of automatic centering positioning is added in chuck center, to quickly center positioning emergency valve, and improve the stability of upper half of emergency valve. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the schematic diagram of the overall structure of the utility model;

[0015] Fig. 2 It is the split schematic diagram of the overall structure of the utility model;

[0016] Fig. 3 It is the structural schematic diagram of three-jaw chuck body in the utility model;

[0017] Fig. 4 It is the schematic diagram of part structure of the utility model;

[0018] In the drawing: 1, three-jaw chuck body; 2, chuck claw; 3, clamping block; 4, anti-skid joint; 5, fixed block; 6, movable plate; 7, centering clamping plate; 8, sliding block; 9, sliding slot; 10, adjusting screw rod; 11, adjusting rod; 12, clamping groove; 13, fixing hole. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0020] The utility model provides technical scheme: as Figs. 1 to 4As shown, in this embodiment, an automatic centering vehicle clamp includes a three-jaw chuck body 1, three chuck jaws 2 are arranged on the three-jaw chuck body 1, the three chuck jaws 2 are arranged in a ring array, a fixed block 5 is fixedly installed at the middle of the upper end of the three-jaw chuck body 1, adjusting lead screws 10 are arranged at both ends of the fixed block 5 respectively, the two adjusting lead screws 10 are fixedly connected through a connecting shaft, the connecting shaft penetrates through the fixed block 5 and is rotationally connected with the fixed block 5, movable plates 6 are respectively sleeved on the outer surfaces of the two adjusting lead screws 10, the movable plates 6 are slidably connected with the three-jaw chuck body 1, center clamping plates 7 are fixedly installed at the upper ends of the two movable plates 6, clamping grooves 12 are respectively arranged at the ends of the two center clamping plates 7 which are close to each other.

[0021] The bottom of the movable plate 6 is fixedly connected with a sliding block 8, and the sliding block 8 is slidably installed in a sliding groove 9 arranged at the upper end of the three-jaw chuck body 1.

[0022] Through the sliding fit of the sliding block 8 and the sliding groove 9, the movable plate 6 is slidably connected with the three-jaw chuck body 1.

[0023] The end of the chuck jaw 2 close to the fixed block 5 is fixedly connected with a clamping block 3, the end of the clamping block 3 close to the fixed block 5 is arranged as an arc surface, and a plurality of anti-skid seams 4 are arranged on the arc surface of the clamping block 3.

[0024] In this way, when the clamping block 3 clamps the emergency valve A, the arc surface of the clamping block 3 can be just fitted with the bottom of the side wall of the emergency valve A, so that the emergency valve A is fixed more stably, and the friction between the clamping block 3 and the emergency valve A can be improved through the anti-skid seams 4.

[0025] The ends of the two adjusting lead screws 10 away from each other are fixedly installed with adjusting rods 11 respectively, and the cross section of the adjusting rod 11 is a regular hexagonal structure.

[0026] In this way, the staff can clamp the adjusting rod 11 by using a wrench, so as to rotate the adjusting lead screw 10.

[0027] A plurality of fixing holes 13 are arranged at the edge position of the upper end of the three-jaw chuck body 1, and the fixing holes 13 are arranged in a ring array.

[0028] The three-jaw chuck body 1 can be fixed on a machining table through the cooperation of the external fixing bolts and the fixing holes 13.

[0029] The utility model provides a kind of automatic centering vehicle clamp, specific working principle is as follows:

[0030] In use, the emergency valve A is placed on the fixed block 5, and the operator can hold the adjusting rod 11 with a wrench to rotate the adjusting screw 10, clockwise rotation can control the two movable plates 6 to approach each other, counterclockwise rotation can control the two movable plates 6 to move away from each other, at this time, clockwise rotation of the adjusting screw 10 controls the two movable plates 6 to approach each other, drives the two center clamping plates 7 to approach each other, and the clamping groove 12 on the center clamping plate 7 clamps the two B points on the upper end of the emergency valve A, thereby positioning the emergency valve A, then the three chuck jaws 2 of the three-jaw chuck body 1 approach each other, the three-jaw chuck body 1 adopts a 260 type three-jaw chuck, and its working principle and internal structure are public technologies, which will not be described here, thereby driving the clamping block 3 to clamp the bottom of the emergency valve A, when the clamping block 3 clamps the emergency valve A, the arc surface of the clamping block 3 can be in close contact with the bottom of the side wall of the emergency valve A, thereby making the emergency valve A more stable, and the anti-skid joint 4 can improve the friction between the clamping block 3 and the emergency valve A, thereby completing the clamping and fixing of the emergency valve A.

[0031] It should be noted that the length of the fixed block 5 needs to be less than the diameter of the bottom of the emergency valve A, so that the fixed block 5 can not interfere with the clamping block 3.

[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic car clamp, comprising a three-jaw chuck body (1), wherein the three-jaw chuck body (1) is provided with three chuck jaws (2), the three chuck jaws (2) being arranged in a circular array, characterized in that: A fixing block (5) is fixedly installed at the middle of the upper end of the three-jaw chuck body (1). An adjusting screw (10) is provided at both ends of the fixing block (5). The two adjusting screws (10) are fixedly connected by a connecting shaft. The connecting shaft passes through the fixing block (5) and is rotatably connected to the fixing block (5). Movable plates (6) are respectively sleeved on the outer surfaces of the two adjusting screws (10). The movable plates (6) are slidably connected to the three-jaw chuck body (1). A centering clamping plate (7) is fixedly installed at the upper end of the movable plate (6).

2. The automatic car clamp according to claim 1, characterized in that: The two central clamping plates (7) are respectively provided with slots (12) at their close ends.

3. The automatic centering clamp for a vehicle according to claim 1, characterized in that: The bottom of the movable plate (6) is fixedly connected to a slider (8), which is slidably installed in a groove (9) opened at the upper end of the three-jaw chuck body (1).

4. The automatic car clamp according to claim 1, characterized in that: The chuck claw (2) is fixedly connected to a clamping block (3) at one end near the fixed block (5), and the clamping block (3) at one end near the fixed block (5) is set as an arc surface.

5. The automatic car clamp according to claim 4, characterized in that: Multiple anti-slip seams (4) are provided on the arc-shaped surface of the clamp (3).

6. The automatic car clamp according to claim 1, characterized in that: An adjusting rod (11) is fixedly installed at one end of each of the two adjusting screws (10) that are far apart from each other. The cross-section of the adjusting rod (11) is a regular hexagonal structure.

7. The automatic car clamp according to claim 1, characterized in that: The upper edge of the three-jaw chuck body (1) is provided with a plurality of fixing holes (13), which are arranged in a ring array.

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