CN115488381A

CN115488381A - Drilling device for air inlet and outlet rocker arm of medium-speed diesel engine

Info

Publication number: CN115488381A
Application number: CN202210578820.3A
Authority: CN
Inventors: 胡凤芹; 张士越; 高先理; 李娟�; 李雪玮; 庞振龙; 王伟
Original assignee: Zichai Power Co ltd; Zichai Machinery Co ltd
Current assignee: Zichai Power Co ltd; Zichai Machinery Co ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-12-20

Abstract

The invention relates to a drilling device for an air inlet and exhaust rocker arm of a medium-speed diesel engine, which comprises: the fixture body is provided with a mandrel; the rotary table is rotationally arranged on the mandrel, a drill jig and a supporting block are arranged on the rotary table, the drill jig is used for guiding a drill bit, and the supporting block is used for limiting the air inlet rocker arm; the positioning assembly is used for fixing the rotating position of the turntable; and the clamping assembly is used for clamping the air inlet rocker arm on the turntable. The device is reasonable in structure, strong in universality, convenient to operate and high in machining precision, and is used for positioning and clamping the peripheral holes machined by the rocker arm.

Description

Medium speed diesel engine advances exhaust rocking arm drilling equipment

Technical Field

The invention relates to a positioning and clamping device for machining an air inlet rocker arm hole of a medium-speed diesel engine, which is mainly applied to the technical field of machining.

Background

The intake rocker arm is one of the important components of the engine, and the dimensional accuracy and the geometric accuracy of all holes on the periphery of the intake rocker arm are important factors influencing the service performance of the engine. In the process of processing and manufacturing, the conventional processing method generally comprises the steps of firstly marking, determining the general position of each hole, then aligning according to the marked hole line and then drilling, and the precision is not high.

The prior art situation is as follows: because the air inlet rocker arm of the medium-speed diesel engine has more inclined holes and more processing stations, the processing position of each hole is determined by marking, and the geometric precision is difficult to ensure. In addition, factors such as irregular workpiece appearance, difficult positioning, large cutting force and the like all affect the correct position of the workpiece in the machining process, so that the phenomenon of position deviation of a machining hole is sometimes caused, and the machining difficulty is high. At present, the most common marking and aligning drilling mode is adopted for processing each hole of the air inlet rocker arm, and the rocker arm shaft is positioned by the end face of a mounting hole of the rocker arm shaft and is manually pressed.

The prior art has the following defects: the hole is positioned by one surface in the machining process, the positioning is insufficient, a workpiece is machined under the condition that the workpiece is not completely positioned, the workpiece is influenced by cutting force, the position is easy to move, and hole drilling deviation can be caused. In addition, holes with different angles need to be machined, multiple times of clamping is needed, the clamp is not suitable for batch production, and the working efficiency is low.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides a drilling device for an air inlet and exhaust rocker arm of a medium-speed diesel engine, which is a device with reasonable structure, strong universality, convenient operation and high processing precision and is used for positioning and clamping a peripheral hole processed by the rocker arm.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a drilling device for an air inlet and outlet rocker arm of a medium-speed diesel engine comprises:

the fixture body is provided with a mandrel;

the rotary table is rotationally arranged on the mandrel, a drill jig and a supporting block are arranged on the rotary table, the drill jig is used for guiding a drill bit, and the supporting block is used for limiting the air inlet rocker arm;

the positioning assembly is used for fixing the rotating position of the rotating disc;

and the clamping assembly is used for clamping the air inlet rocker arm on the turntable.

Further, the positioning assembly comprises:

the positioning column is arranged on the fixture body in a sliding mode, a spring is sleeved on the positioning column, and two ends of the spring are respectively abutted against the positioning column and the fixture body;

the positioning pin is fixedly arranged at the inner end of the positioning column;

the positioning hole is formed in the rotary table, and the positioning pin can be slidably inserted into the positioning hole.

Furthermore, the outer end of the positioning column is provided with a handle.

Further, the clamping assembly includes:

the stud is in threaded connection with the mandrel;

the opening pressing plate is sleeved on the stud;

the first nut is in threaded connection with the stud, and the inner end of the first nut is abutted to the mandrel;

and the second nut is in threaded connection with the stud, and the inner end of the second nut is abutted to the opening pressing plate.

Furthermore, the opening pressing plate is circular and one side is open.

Further, the mandrel is replaceable.

Further, the carousel is removable.

Furthermore, a plurality of drill jigs are arranged at a plurality of positions of the rotary table.

A drilling method for an air inlet and exhaust rocker arm comprises the following steps:

a. sleeving an air inlet rocker arm on the mandrel, positioning the air inlet rocker arm by using a shaft mounting hole and an end face of the air inlet rocker arm, and limiting the air inlet rocker arm through a supporting block;

b. screwing a second nut, and tightly pressing and fixing the air inlet rocker arm on the rotary table through the opening pressing plate;

c. the turntable rotates to a drilling station, the positioning pin is inserted into the positioning hole of the turntable, and the drill sleeve of the drill jig is used for guiding the drill bit to drill the air inlet rocker arm;

d. after drilling, pulling out the positioning pin, and then transferring the turntable to the processing station of the next hole to perform drilling operation;

e. repeating steps c and d until all holes are machined.

The invention has the beneficial effects that:

the special rotatable tool replaces the traditional processing mode, the workpiece is reliably positioned, all straight and inclined holes are processed by one-time clamping, the working efficiency is high, the labor intensity of workers is reduced, the turnover time of the workpiece is shortened, and the processing period is shortened; by the application of the special positioning mandrel and the supporting block, the correct position of the workpiece is fixed, and the workpiece displacement caused by external force is avoided. In addition, by replacing the replaceable turntable, the mandrel and other parts, the processing and the use of other different types of intake and exhaust rocker arms are realized.

Drawings

The invention is further illustrated by the following examples in conjunction with the drawings.

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at location A;

fig. 4 is a partially enlarged view at the B position of fig. 2.

In the figure:

1. the fixture comprises a fixture body, 2 parts of a rotary table, 3 parts of a mandrel, 4 parts of a clamping assembly, 5 parts of an opening pressing plate, 6 parts of a drill jig, 7 parts of a positioning assembly, 8 parts of a supporting block and 9 parts of an air inlet rocker arm

401. First nut, 402 stud, 403 second nut

701. The positioning column, 702, the spring, 703, the positioning pin, 704, the positioning hole, 705 and the handle.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A drilling device for an air inlet and exhaust rocker arm of a medium-speed diesel engine comprises a clamp body 1, wherein a replaceable mandrel 3 is arranged on the clamp body 1, and the mandrel 3 is connected with the clamp body 1 in a clearance fit manner; the mandrel 3 is sleeved with a rotatable turntable 2, the inner hole at the rear end of the turntable 2 is positioned on the mandrel 3, and the two are in clearance fit and are pressed by screws so as to conveniently replace the turntable 2. The rotary table 2 is provided with a drill jig 6 for guiding a drill bit and a supporting block 8 for limiting the air inlet rocker arm 9, and each replaceable rotary table 2 is provided with a plurality of drill jigs 6 with different positions, so that drilling operation is performed on different positions on different air inlet rocker arms 9.

The anchor clamps body 1 facial make-up is equipped with the locating component 7 that is used for the rotational position of fixed carousel 2, and the concrete structure of locating component 7 includes: the positioning column 701 is arranged on the fixture body 1 in a sliding mode, a spring 702 is sleeved on the positioning column 701, and two ends of the spring 702 are respectively abutted against the positioning column 701 and the fixture body 1; the inner end of the positioning column 701 is fixedly provided with a positioning pin 703, and the outer end of the positioning column 701 is provided with a handle 705. The turntable 2 is provided with a plurality of positioning holes 704, the positioning pin 703 can be slidably inserted into the positioning holes 704 by the elastic force of the spring 702, so that the position of the turntable 2 is fixed, and the turntable 2 can continue to rotate by pulling out the positioning pin 703 from the positioning holes 704.

The front end of mandrel 3 is equipped with clamping unit 4, and clamping unit 4 is used for the clamping of inlet arm 9 on carousel 2, and clamping unit 4's concrete structure includes: the stud 402 is in threaded connection with the mandrel 3, an opening pressing plate 5 is sleeved on the stud 402, and the opening pressing plate 5 is circular and is provided with an opening at one side. The stud 402 is further provided with a first nut 401 and a second nut 403, the first nut 401 and the second nut 403 are screwed to the stud 402, the inner end of the first nut 401 abuts against the spindle 3, the first nut 401 can prevent the stud 402 and the spindle 3 from loosening, and the inner end of the second nut 403 abuts against the aperture pressing plate 5. When the workpiece is clamped, the opening pressing plate 5 is adopted, the second nut 403 is screwed to enable the opening pressing plate 5 to press the air inlet rocker arm 9, the second nut 403 is only required to be loosened slightly when the air inlet rocker arm 9 is assembled and disassembled, the opening pressing plate 5 is taken out, the nut is not required to be screwed off completely, the machined workpiece can be replaced, and the operation is convenient and fast.

The specific drilling method comprises the following steps:

a. sleeving an air inlet rocker arm 9 on a mandrel 3, positioning the air inlet rocker arm 9 by using an axis mounting hole and an end face of the air inlet rocker arm 9, and limiting the air inlet rocker arm 9 through a supporting block 8, so that the positioning precision is ensured, wherein the axis mounting hole of the air inlet rocker arm 9 is in clearance fit with the mandrel 3, so that the air inlet rocker arm 9 can be assembled and disassembled conveniently; and the changeable rotary table 2 is designed, and the drilling processing use of the air inlet and outlet rocker arms 9 of different machine types can be met only by changing the rotary table 2 and the mandrel 3.

b. The second nut 403 is screwed, and the air inlet rocker arm 9 is pressed and fixed on the turntable 2 through the opening pressing plate 5; when the workpiece is clamped, the opening pressing plate 5 is adopted, the air inlet rocker arm 9 is pressed by the clamping assembly 4, the machined workpiece can be replaced by only slightly loosening the second nut 403 to assemble and disassemble the air inlet rocker arm 9, and the opening pressing plate 5 is taken out without completely unscrewing the nuts, so that the convenience and the rapidness are realized.

c. The turntable 2 rotates to a drilling station, the positioning pin 703 is inserted into the positioning hole of the turntable 2, and a drill bushing of the drill jig 6 is used for guiding a drill bit to drill the air inlet rocker arm 9;

d. after drilling, the positioning pin 703 is pulled out, and the turntable 2 is turned to the next hole processing station to perform drilling operation;

e. and (d) repeating the steps c and d until all holes are machined, and finally realizing a high-efficiency and high-quality technological machining equipment scheme.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a medium speed diesel engine advances exhaust rocking arm drilling equipment which characterized in that includes:

the fixture comprises a fixture body (1), wherein a mandrel (3) is arranged on the fixture body (1);

the rotary table (2) is rotatably arranged on the mandrel (3), a drill jig (6) and a supporting block (8) are arranged on the rotary table (2), the drill jig (6) is used for guiding a drill bit, and the supporting block (8) is used for limiting an air inlet rocker arm (9);

the positioning assembly (7) is used for fixing the rotating position of the rotating disc (2);

and the clamping assembly (4) is used for clamping the air inlet rocker arm (9) on the rotary disc (2).

2. The drilling device for the air inlet and outlet rocker arms of the medium-speed diesel engine as claimed in claim 1,

the positioning assembly (7) comprises:

the positioning column (701) is arranged on the clamp body (1) in a sliding mode, a spring (702) is sleeved on the positioning column (701), and two ends of the spring (702) are respectively abutted to the positioning column (701) and the clamp body (1);

the positioning pin (703) is fixedly arranged at the inner end of the positioning column (701);

the positioning hole (704) is formed in the rotary disc (2), and the positioning pin (703) can be slidably inserted into the positioning hole (704).

3. The intake and exhaust rocker arm drilling device for the medium-speed diesel engine according to claim 2,

the outer end of the positioning column (701) is provided with a handle (705).

4. The drilling device for the air inlet and outlet rocker arms of the medium-speed diesel engine as claimed in claim 1,

the clamping assembly (4) comprises:

a stud (402) in threaded connection with the spindle (3);

the opening pressing plate (5) is sleeved on the stud (402);

a first nut (401) in threaded connection with the stud (402), the inner end of the first nut (401) abutting against the spindle (3);

and a second nut (403) which is screwed with the stud (402), wherein the inner end of the second nut (403) is abutted against the opening pressure plate (5).

5. The intake and exhaust rocker arm drilling device for the medium-speed diesel engine according to claim 4,

the opening pressing plate (5) is circular and is provided with an opening at one side.

6. The drilling device for the air inlet and outlet rocker arms of the medium-speed diesel engine as claimed in claim 1,

the spindle (3) is replaceable.

7. The drilling device for the air inlet and outlet rocker arms of the medium-speed diesel engine as claimed in claim 1,

the rotary disc (2) is replaceable.

8. The drilling device for the air inlet and outlet rocker arms of the medium-speed diesel engine as claimed in claim 1,

a plurality of drill jigs (6) are arranged at a plurality of positions of the rotary table (2).

9. A drilling method for an intake and exhaust rocker arm of a medium speed diesel engine by using the drilling device for the intake and exhaust rocker arm of the medium speed diesel engine as claimed in any one of claims 1 to 8 is characterized by comprising the following steps:

a. sleeving an air inlet rocker arm (9) on the mandrel (3), positioning the air inlet rocker arm (9) through a shaft mounting hole and an end face of the air inlet rocker arm, and limiting the air inlet rocker arm (9) through a supporting block (8);

b. the second nut (403) is screwed, and the air inlet rocker arm (9) is tightly pressed and fixed on the rotary table (2) through the opening pressing plate (5);

c. the turntable (2) rotates to a drilling station, the positioning pin (703) is inserted into the positioning hole of the turntable (2), and a drill bushing of the drill jig (6) is used for guiding a drill bit to drill the air inlet rocker arm (9);

d. after drilling, pulling out the positioning pin (703), and then rotating the turntable (2) to the processing station of the next hole to perform drilling operation;

e. and c and d are repeated until all holes are processed.