CN-121972953-A - Double-shaft synchronous tightening equipment for camshaft flange plate bolts of marine diesel engine

Abstract

The invention discloses a double-shaft synchronous tightening device for a flange plate bolt of a camshaft of a marine diesel engine, which comprises a double tightening mechanism matched with a flange to be tightened in a camshaft box, wherein the double tightening mechanism comprises two tightening tools capable of being clasped on the camshaft in the camshaft box, each tightening mechanism comprises at least two tightening execution units symmetrically arranged along the camshaft, the double tightening mechanism is provided with an adjusting mechanism for adjusting the height of the tightening execution units and controlling the rotation of the tightening execution units, the double tightening mechanism and the flange to be tightened are provided with positioning mechanisms for confirming the initial position of the double tightening mechanism, the adjusting mechanism comprises an indexing mechanism and a supporting platform, the indexing mechanism is connected with the two tightening tools of the double tightening mechanism and drives the two tightening tools to synchronously rotate, the indexing mechanism is arranged on the supporting platform capable of adjusting the height of the indexing mechanism, and the device can effectively treat the narrow space and the central belt shaft structure of the camshaft box of the marine diesel engine, and the cam and the circular flange plate simultaneously and meet the requirements of high-quality synchronous tightening process.

Inventors

• ZHANG CHUNYAN
• ZHU XIAOXIAO
• YUAN LINJIE
• ZHANG SHENGWEN
• CHENG DEJUN
• FANG XIFENG
• MA JINLONG

Assignees

• 江苏科技大学

Dates

Publication Date

20260505

Application Date

20260319

Claims (10)

1. 1. A marine diesel engine camshaft flange bolt double-shaft synchronous tightening device is characterized by comprising double tightening mechanisms (2) matched with a flange to be tightened in a camshaft box (1), wherein the double tightening mechanisms (2) comprise two tightening tools capable of being clasped on the camshaft box (1-1) in the camshaft box (1), the two tightening tools are arranged at intervals, each tightening mechanism comprises at least two tightening execution units symmetrically arranged along the camshaft (1-1), the double tightening mechanisms (2) are provided with adjusting mechanisms for adjusting the height of the double tightening mechanisms and controlling the double tightening mechanisms to rotate, and positioning mechanisms for confirming the initial positions of the double tightening mechanisms (2) are arranged on the double tightening mechanisms (2) and the flange to be tightened.
2. 2. The device according to claim 1, wherein the adjusting mechanism comprises an indexing mechanism (3) and a supporting platform (4), the indexing mechanism (3) is connected with two tightening tools of the double tightening mechanism (2) and drives the two tightening tools to synchronously rotate, and the indexing mechanism (3) is arranged on the supporting platform (4) capable of adjusting the height of the supporting platform.
3. 3. The apparatus of claim 1, wherein the tightening tool comprises a hinge type tool carrier and a driving unit for driving the tool carrier to open and close, and the tightening execution unit is arranged on the tool carrier.
4. 4. The apparatus of claim 3, wherein the tool carrier is provided with V-shaped positioning blocks for contacting with the surface of the camshaft (1-1), wherein at least one V-shaped positioning block has a height-adjustable structure, so that two tightening tools are concentric with the camshaft (1-1) when the two tightening tools are wrapped around the camshaft (1-1).
5. 5. The apparatus of claim 1, wherein the tightening unit comprises a head coupled to the flange to be tightened, and a rotary unit and a telescopic unit for controlling rotation and extension of the head, and wherein the telescopic unit is provided with an induction device for sending out an in-place signal when the head reaches a set position.
6. 6. The apparatus of claim 5, wherein the rotary units are hydraulic, and the rotary units of all the tightening execution units on the same tightening tool share an oil passage.
7. 7. The apparatus according to claim 2, wherein the support platform (4) is provided with a cage (4-1) for connection of the indexing mechanism (3), the cage (4-1) being ball-hinged to the telescopic means of the support platform (4).
8. 8. The device according to claim 1, wherein the positioning mechanism comprises a positioning auxiliary tool (6) and an optical fiber sensor (7), the positioning auxiliary tool (6) is detachably connected to the flange to be screwed, a positioning probe (6-1) for detecting the optical fiber sensor (7) is arranged on the positioning auxiliary tool (6), and the optical fiber sensor (7) is arranged on the screwing tool.
9. 9. The device of claim 8, wherein the positioning auxiliary tool (6) is provided with a V-shaped positioning groove for being clamped on a bolt head on a flange to be screwed, the axis of the positioning probe (6-1) passes through the center of the clamped bolt head, the positioning auxiliary tool (6) is also provided with a positioning side edge (6-2) for enabling the positioning probe (6-1) to pass through the center of the cam shaft (1-1), and the positioning side edge (6-2) is abutted on an adjacent bolt head.
10. 10. The device according to claim 9, characterized in that the positioning aid (6) is provided with a magnetic means for adsorption on the flange to be screwed.

Description

Double-shaft synchronous tightening equipment for camshaft flange plate bolts of marine diesel engine Technical Field The invention relates to bolt tightening equipment, in particular to biaxial synchronous tightening equipment for a camshaft flange bolt of a marine diesel engine. Background Bolts are a common type of connection and play a vital role in various mechanical devices and structures. Proper tightening of the bolts is critical to the safety, stability and proper operation of the device. The bolting of the camshaft flange of the marine diesel engine is a key link in the power transmission chain, and the assembly quality directly influences the operation reliability and service life of the host. However, in the actual assembly process of the component, there are the following problems: The operating space is extremely narrow, i.e. the camshaft is mounted in a closed camshaft housing, and the operator can only operate through a narrow opening in the side of the housing (as shown in fig. 1). This limited space makes conventional automated tightening equipment difficult to access and severely limits the operator's arm activity and tool swing range. The double flange structure presents a complex challenge in that, as shown in fig. 1, a cam flange and a round flange are respectively disposed at both ends of the cam shaft in a single cam shaft housing, both of which need to be bolted. The device not only doubles the workload, but also has different structures of two flanges and different gaps between the two flanges and adjacent cams, and further increases the complexity and difficulty of designing a set of equipment to simultaneously adapt to the two structures. Synchronous and symmetrical screwing cannot be realized, and the prior art mainly relies on an operator to use a torque wrench to screw bolts one by one while driving a cam shaft. The method can not realize cross tightening of the bolts, is extremely easy to cause uneven stress and deflection of the flange surface, thereby causing the problems of gasket sealing failure, large dispersion of bolt pretightening force and the like, and is a hidden trouble of leakage and looseness during long-term operation of equipment. The intermediate belt shaft structure presents a particular challenge in that the center of the camshaft flange is the camshaft body, which makes most of the automated tightening devices (the drive mechanism of which is usually centered) designed for planar flanges on the market not directly applicable. How to design a tightening device capable of bypassing or holding a central shaft is a core difficulty in realizing automation. The assembly efficiency is low, because of the limitation of the space and the structure, an operator needs to screw the bolts on the two flange plates in sequence, the screwing process is tedious and slow, the assembly efficiency and the productivity of the whole marine diesel engine assembly production line are seriously restricted. The labor intensity of operators is high, the working environment is bad, the operators need to apply large torque under the awkward gesture for a long time, the physical strength is greatly consumed, the tightening quality is unstable easily caused by fatigue, and even the risk of personal injury is caused. Disclosure of Invention The invention aims to provide the biaxial synchronous tightening equipment for the flange bolts of the camshaft of the marine diesel engine, which can effectively cope with the narrow space and the central shaft structure of the camshaft box of the marine diesel engine, is required to process the cams and the circular flange simultaneously and meets the requirements of the high-quality synchronous tightening process. The marine diesel engine camshaft flange bolt double-shaft synchronous tightening equipment comprises double tightening mechanisms matched with a flange to be tightened in a camshaft box, wherein the double tightening mechanisms comprise two tightening tools capable of being wrapped on a camshaft in the camshaft box, the two tightening tools are arranged at intervals, each tightening mechanism comprises at least two tightening execution units symmetrically arranged along the camshaft, the double tightening mechanisms are provided with adjusting mechanisms for adjusting the height and controlling the rotation of the adjusting mechanisms, and positioning mechanisms for confirming the initial positions of the double tightening mechanisms are arranged on the double tightening mechanisms and the flange to be tightened. Through setting up two and embracing the frock of screwing up on the camshaft, the problem that screw up the mechanism and can't install and fix a position under the central band shaft structure has been solved at first, screw up the frock and pass not from the flange center, but embrace on the epaxial from outside to the hindrance of center pin (camshaft) has been bypassed. Each tightening tool is provided with at least two tig