Compensation limiting clamp for grinding arc surface of surface grinding machine

Abstract

The utility model provides a limiting clamp for compensating dimensional tolerance of a rocker arm during machining of an arc surface of the rocker arm, and belongs to the field of machine manufacturing. The structural design comprises a base, a connecting screw a, a positioning pin, a set screw a, a diamond dressing pen, an arc dressing shaft, a lining, a left end plate, a connecting screw b, a pressing supporting block, a pressing screw, a right end plate, a handle, a handle screw, a nut, a set screw b, an adjusting sleeve, an eccentric wheel supporting block, a connecting screw c, an eccentric wheel, a shaft pin, a limiting telescopic pin, a compression spring and the like. The problems that limiting is inaccurate due to dimensional tolerance of the rocker arm, and the rocker arm moves in the grinding process are solved. The rocker arm arc surface machining tool is easy and fast to design and operate, reliable in structure and accurate in positioning, production safety and product quality are guaranteed when the rocker arm arc surface machining tool is used for machining rocker arm arc surfaces, and economic benefits are obvious.

Description

Technical Field

[0001] The utility model relates to a compensation limit fixture for grinding an arc surface of a surface grinder, belonging to the technical field of mechanical manufacturing. Background Art

[0002] The rocker arm is a transmission component of the valve train of an automobile engine, which can open and close the valve timely and has reliable action. It is an important part of the valve train. As Figure 4 As shown in the schematic diagram before the improvement of the utility model, such rocker arms are processed by the fixture before improvement. Due to the lack of a limit expansion pin device, the rocker arm has a tendency to move towards the end without limit during the grinding process. When the component force generated by grinding is greater than the frictional force generated by the pressing force of the pressing screw, the rocker arm will displace. If the rocker arm displaces during the grinding process, on the one hand, the personal safety is faced with a great threat, and on the other hand, the dimensional accuracy of the product cannot be guaranteed, and the surface roughness and profile of the grinding cannot be guaranteed either. Summary of the Invention

[0003] The purpose of the utility model is to solve and improve the safety problems and quality problems existing in traditional processing by providing a novel and reasonable structural design scheme. At the same time, the designed scheme can make up for the change of the total length dimension of the rocker arm to be processed due to the machining tolerance during the limiting process.

[0004] To achieve the above object, the utility model adds a compensation limit telescopic device and adopts the following technical solutions: A grinding arc surface compensation limit fixture for a surface grinder, comprising a base (1), a connecting screw a (2), a positioning pin (3), a set screw a (4), a diamond dressing pen (5), an arc dressing shaft (6), a bushing (7), a left end plate (8), a connecting screw b (9), a pressing support block (10), a pressing screw (11), a right end plate (12), a handle screw (13), a nut (14), a handle (15), a set screw b (16), an adjusting sleeve (17), an eccentric wheel support block (18), a connecting screw c (19), an eccentric wheel (20), a shaft pin (21), a limit telescopic pin (22), a compression spring (23) and a to-be-machined rocker arm (24). The left end plate and the right end plate are symmetrically arranged on both sides of the base. The bushing is press-fitted into the mounting holes of the two end plates. The two end plates are respectively fixed to the base through the connecting screw a and the positioning pin. The arc dressing shaft passes through the two bushings for installation, and an adjusting sleeve, a handle and a handle screw are axially assembled in sequence. The handle is axially locked and fixed through the set screw b and the nut. The diamond dressing pen is installed at the end of the arc dressing shaft and fixed through the set screw a. The pressing support block is fixed to the base through the connecting screw b, and the pressing screw locks the to-be-machined rocker arm. The eccentric wheel support block is fixed to the base through the connecting screw c, and an eccentric wheel, a shaft pin, a limit telescopic pin and a compression spring are assembled inside. The telescopic action of the limit telescopic pin is driven by the rotational movement of the eccentric wheel to realize the quick clamping and release of the to-be-machined rocker arm, and the compression spring ensures the automatic reset of the limit telescopic pin.

[0005] Furthermore, after assembling the shaft pin, the eccentric wheel and the eccentric wheel support block first, the two ends of the shaft pin are caulked and connected to prevent the eccentric wheel from coming out during the rotation operation. Then, the compression spring and the limit telescopic pin are installed in the base, and then the assembled eccentric wheel support block is connected and fixed to the base with the connecting screw c. Under the action of the pre-pressure of the compression spring force, the limit telescopic pin tightly presses the eccentric wheel support block. When the eccentric wheel is rotated downward, the compression spring contracts and the limit telescopic pin pops out, and the length of the pop-out varies according to the total length of the rocker arm. When the eccentric wheel is rotated upward after grinding, the limit telescopic pin contracts under the action of the reset force of the compression spring, which is convenient for taking out the rocker arm that has completed grinding and clamping the to-be-machined rocker arm next time.

[0006] The beneficial effects of the utility model are as follows: The operation is simple, fast, safe and reliable; it solves the phenomenon that the to-be-machined rocker arm displaces during the processing, eliminates potential safety hazards and improves the product quality at the same time, and the economic benefits are obvious. Description of the Drawings

[0007] Figure 1 It is a schematic diagram of the utility model.

[0008] Figure 2 It is a sectional schematic diagram of the utility model.

[0009] Figure 3 It is the rocker arm to be processed.

[0010] Figure 4 This is the schematic diagram before the improvement of the present utility model.

[0011] In the figure: 1 - base, 2 - connecting screw a, 3 - positioning pin, 4 - set screw a, 5 - diamond dressing pen, 6 - arc dressing shaft, 7 - bushing, 8 - left end plate, 9 - connecting screw b, 10 - pressing support block, 11 - pressing screw, 12 - right end plate, 13 - handle screw, 14 - nut, 15 - handle, 16 - set screw b, 17 - adjusting sleeve, 18 - eccentric wheel support block, 19 - connecting screw c, 20 - eccentric wheel, 21 - shaft pin, 22 - limit telescopic pin, 23 - compression spring, 24 - rocker arm to be processed. Specific embodiments

[0012] The present utility model aims to solve the potential safety hazards and quality problems caused by the displacement phenomenon of the rocker arm to be processed during the processing. To clearly illustrate the technical characteristics of this solution, the following is a specific embodiment and the solution will be elaborated in combination with the attached drawings.

[0013] As shown in the attached drawings, a compensation limit fixture for grinding an arc surface of a surface grinder includes a base (1), a connecting screw a (2), a positioning pin (3), a set screw a (4), a diamond dressing pen (5), an arc dressing shaft (6), a bushing (7), a left end plate (8), a connecting screw b (9), a pressing support block (10), a pressing screw (11), a right end plate (12), a handle screw (13), a nut (14), a handle (15), a set screw b (16), an adjusting sleeve (17), an eccentric wheel support block (18), a connecting screw c (19), an eccentric wheel (20), a shaft pin (21), a limit telescopic pin (22), a compression spring (23) and a rocker arm to be processed (24). After installing a bushing (7) in each of the left end plate (8) and the right end plate (12), connect them to the base (1) with the connecting screw a (2) and fix the position with the positioning pin (3) to ensure that after installing the arc dressing shaft (6), the rotation center of the arc dressing shaft (6) meets the position requirements for grinding the arc surface of the rocker arm to be processed (24); install the diamond dressing pen (5) and adjust the distance from the tip of the diamond dressing pen (5) to the rotation center of the arc dressing shaft (6) to ensure the dimensional requirements for grinding the arc surface of the rocker arm to be processed (24), and then tighten the set screw a (4); successively install the adjusting sleeve (17), the handle (15) and the handle screw (13), then tighten the set screw b (16) and lock the nut (14); connect and fix the pressing support block (10) to the base (1) with the connecting screw b (9) and install the pressing screw (11); install the pin shaft (21), the eccentric wheel (20), and the eccentric wheel support block (18) according to the attached Figure 2Assemble and caulking rivets at both ends of the pin shaft (21) (to prevent the pin shaft from falling out during the use of the fixture). After installing the compression spring (23) and the limit expansion pin (22) in the base (1), connect and fix the eccentric wheel support block (18) to the base (1) with the connecting screw c (19). When the rocker arm to be machined (24) is installed and tightened by the pressing screw (11), rotate the eccentric wheel (20) downward. The eccentric wheel (20) ejects the limit expansion pin (22) until it contacts the rocker arm to be machined (24) to complete the limiting. When the grinding is finished, rotate the eccentric wheel (20) upward. The limit expansion pin (22) retracts under the action of the reset force of the compression spring (23). After loosening the pressing screw (11), the machined rocker arm can be taken out, and preparations are made for clamping the rocker arm to be machined next time.

[0014] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compensating limit fixture for grinding arc surfaces on a surface grinder, characterized by: The invention comprises a base (1), a connecting screw a (2), a positioning pin (3), a set screw a (4), a diamond dressing pen (5), an arc dressing shaft (6), a bushing (7), a left end plate (8), a connecting screw b (9), a clamping support block (10), a clamping screw (11), a right end plate (12), a handle screw (13), a nut (14), a handle (15), a set screw b (16), an adjustment sleeve (17), an eccentric wheel support block (18), a connecting screw c (19), an eccentric wheel (20), an axle pin (21), a limiting telescopic pin (22), a compression spring (23) and a rocker arm to be processed (24). The left end plate and the right end plate are symmetrically arranged on both sides of the base, and the bushing is press-fitted on the two end plates. The two end plates are fixed to the base by connecting screws a and locating pins respectively; the arc dressing shaft is installed through the two bushings, and the axial direction is sequentially equipped with an adjusting sleeve, a handle and a handle screw, and the handle is axially locked and fixed by a set screw b and a nut. The diamond dressing pen is installed on the end of the arc dressing shaft and fixed by a set screw a; the clamping support block is fixed to the base by a connecting screw b, and the clamping screw locks the rocker arm to be processed. The eccentric wheel support block is fixed to the base by a connecting screw c, and an eccentric wheel, a shaft pin, a limit telescopic pin and a compression spring are assembled inside. The telescopic action of the limit telescopic pin is driven by the rotational movement of the eccentric wheel to realize the rapid clamping and release of the rocker arm to be processed, and the compression spring ensures that the limit telescopic pin is automatically reset.

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