Automatic positioning system of the hottest heat p

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Automatic positioning system of heat pipe radiator threading machine

Abstract: heat pipe radiator uses the principle of heat conduction and the fast heat transfer property of refrigerant to quickly transfer the heat of heated objects to the heat source through the heat pipe. At present, it is widely used in aerospace, metallurgy, coal mining and other industries. Aiming at the current situation that the penetration and positioning of heat sink depends on the positioning gasket, a device using electromagnet and crank slider mechanism is developed to realize the automatic positioning of the spacing of heat sink, so as to improve the working efficiency and safety factor of heat sink penetration

key words: heat pipe threading electromechanical magnet crank slider positioning system

1. Introduction

the basic working principle of heat pipe is shown in Figure 1. A typical heat pipe is composed of a tube shell, a wick and an end cap, and the inside of the pipe is drawn into 1.3 × After the negative pressure of (10 -1 ~ 10 -4) Pa is filled with an appropriate amount of working liquid, the wick capillary porous material close to the inner wall of the pipe is filled with liquid and sealed. One end of the pipe is the evaporation section (heating section) and the other end is the condensation section (cooling section). According to the application needs, an insulation section can be arranged between the two sections. When one end of the heat pipe is heated, the liquid in the capillary core evaporates, and the steam flows to the other end under a small pressure difference to release heat and condense into liquid. The liquid flows back to the evaporation section along the porous material by the action of capillary force. In this cycle, the heat is transferred from one end of the heat pipe to the other end

Figure 1 basic working principle of heat pipe

the function of the heat sink is to increase the heat transfer area of the heat pipe, so that the heat can be effectively transferred to the air. The currently used heat sink is made of aluminum alloy, with a thickness of 1 mm, and the spacing between the heat sinks is 4 mm, 8 mm, 12 mm, and 16 mm. In order to ensure the spacing between the fins, the positioning gasket is currently used to limit the position of the threading machine, but this method is inefficient, time-consuming and laborious, It is easy for operators to put the wrong number or position of gaskets. In view of this situation, a crank slider mechanism with electromagnet as the power source is studied and designed, which uses the intermittent movement of the ratchet to adjust the rising distance of the lower plate of the threading machine

2. The structural features of the automatic positioning system of the threading machine

are shown in Figure 2. When the electromagnetic iron is powered on, it generates magnetic force to attract the small shaft and make the small shaft move up and down. The small shaft drives the transmission shaft to make the pawl move back and forth through the crank slider mechanism. The pawl drives the ratchet wheel and gear to rotate. Finally, the gear makes the rack move. There are grooves with a spacing of 4 mm and 8 mm on both sides of the rack. The positioning sleeve contains springs and φ The steel ball and rack of 6 can be positioned through the groove every 4 mm. When the rack touches the travel switch installed on the lower plate of the threading machine, the lower plate stops moving. In this way, about 80million people will enter the urban area to achieve the purpose of automatic positioning of the spacing of heat sinks. The slider and crank shaft are connected by thread, and the position of the slider in the crank frame can be adjusted to achieve a suitable stroke

Figure 2 CAD structure diagram

1 Bottom plate 2 Small shaft 3 Drive shaft 4 Crankshaft 5 shaft sleeve II 6 Shaft sleeve I 7 Connecting plate 8 Connecting plate shaft 9 Shaft retaining ring 10 10 Retaining ring for shaft 1211 Ratchet gear spindle 12 Positioning sleeve 13 Rack guide bush 14 Rack gland 15 Gear 16 Crank frame 17 Slider 18 Crank gland 19 Crank gland II 20 Crankshaft 21 Bracket 22 Pawl 23 Guide nut 24 Guide sleeve 25 Ratchet 26 Rack 27 Lining plate 28 Electromagnet

3. Design of crank slider mechanism

Figure 3 crank slider ratchet mechanism

the above figure is a crank slider ratchet mechanism with adjustable stroke. Its working principle is: cam 1 rotates around fixed axis A, on which there is profile groove a, the roller on rocker 2 rolls in 300 mm profile groove, with nut and rocker 2 rotating around fixed axis B. Connecting rod 3, slider 10 and rocker 5 form rotating pairs C and D. ratchet 6 rotates periodically under the action of pawl 4, which can rotate around point D on rocker 5. The slider 10 can adjust different positions along the screw axis with the help of the screw 7. That is, the length BC of the rocker can be adjusted to change the swing angle of the rocker 5, that is, the angle of each swing of the follower ratchet 6 can be adjusted

the positioning mechanism of the threading machine is reformed according to this mechanism, which changes the cam into a rocker, and the electromagnet drives the small shaft, which reciprocates up and down to achieve the function of the cam. The slider 17 runs in the slideway of the crank frame 16, and the crank shaft 20 is threaded with the slider 17. The length of the connecting plate 7 can be adjusted to make the ratchet rotate at different distances each time the pawl moves

The typical structure of the ratchet mechanism is shown in the figure. The mechanism is composed of rocker 1, pawl 2, ratchet 3, stop pawl 4 and machining. Spring 5 is used to keep detent 4 in contact with ratchet 3. Similarly, a spring can be set between the rocker 1 and the ratchet 2 to ensure the contact between the pawl 2 and the ratchet 3. The ratchet 3 is fixed on the transmission shaft of the mechanism, and the rocker 1 is sleeved on the transmission shaft. When the rocker 1 swings counterclockwise, the pawl 2 is inserted between the teeth of the ratchet 3 and pushes the ratchet 3 to rotate at a certain angle. When the rocker 1 swings clockwise, the stop pawl 4 prevents the ratchet 3 from rotating clockwise, and the ratchet 2 slides on the tooth back of the ratchet 3, so the ratchet 3 is stationary. In this way, when the rocker 1 swings back and forth continuously, the ratchet 3 obtains one-way intermittent motion. The ratchet mechanism has the advantages of simple structure, convenient manufacture and reliable movement; In addition, the dynamic range of the ratchet shaft can be adjusted in a large range, which are its advantages

4. Design of single axis mobile interlocking device

Figure 4 spring positioning device

in Figure 4, rack 3 is interlocked with steel balls 1 and 2. When the space between heat sinks is 4mm, steel ball 1 is used; when the space between heat sinks is 8mm, steel ball 2 is used. When the rack moves up and down, the steel ball is pushed into the groove, and the rack 3 is stuck. The steel balls 1 and 2 in the figure are embedded into the groove of the rack 3 under the action of the spring to play the role of axial positioning

5. Use SolidWorks to model

Figure 5 three-dimensional structure diagram

use SolidWorks software to model the whole mechanism, simulate the actual motion state, check whether the required action can be achieved, and adjust the size of unqualified parts


[1] Zhuang Jun, Zhang Hong Heat pipe technology and its engineering application, chemical industry press, 2000 To keep the instrument clean and tidy

[2] Liu Jianmin The principle of heat and mass transfer and its application in power technology China Electric Power Press, 2006

[3] Lu Bo, Huang Xingtao Fundamentals of machine manufacturing technology, China Science and Technology Press, 2006

[4] zouhuijun, mechanical principle course design manual, higher education press, 1998

Abstrat: Heat pipe radiator take the advantage of heat conduction theory and fast heat transfer nature of refrigeration medium, it conduct the heat to the outside through the heat pipe. At present, heat pipe has been used in professions and so on astronavigation, metallurgy, coal mine. Put on the system localization depends on locating shim in view of the present radiator fin the situation, developments one kind realizes the radiator fin, which also makes everyone full of expectations for the future development of graphene. Spacing automatic positioning using the electric magnet and the crank block organization installation, enhances the radiator fin to put on the system the working efficiency and the safety coefficient.

Key words :heat pipe Puts on piece machine Electro-magnet Crank block Positioning system(end)

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