Electric wrench refers to an electric tool for tightening and loosening bolts and nuts. It is a tool for tightening high-strength bolts. It is used for initial tightening, final tightening and initial tightening of torsional shear high-strength bolts in the construction of large hexagon head high-strength bolts for the installation of steel structure bridges, plant buildings, chemical industry and power generation equipment, as well as occasions with strict requirements on the torque or axial force of bolt fasteners.

定轉(zhuǎn)矩電動(dòng)扳手是一種能自動(dòng)控制轉(zhuǎn)矩的電動(dòng)扳手。它適用于需要用高強(qiáng)度螺栓連接的橋梁結(jié)構(gòu)、大型鋼塔、鋼結(jié)構(gòu)廠房、冶金設(shè)備的構(gòu)架、大型起重機(jī)架、礦井鋼架等工程中及大型柴油機(jī)、發(fā)電設(shè)備、化工設(shè)備中，要求恒定的夾緊力連接的螺栓也可用定轉(zhuǎn)矩扳手來(lái)緊固。

Constant torque electric wrench is an electric wrench that can automatically control torque. It is applicable to bridge structures, large steel towers, steel structure plants, frames of metallurgical equipment, large crane frames, mine steel frames and other projects that need to be connected with high-strength bolts, as well as large diesel engines, power generation equipment and chemical equipment. Bolts requiring constant clamping force can also be tightened with constant torque wrenches.

特別在現(xiàn)代橋梁建設(shè)中，定轉(zhuǎn)矩電動(dòng)扳手是實(shí)現(xiàn)以“栓焊梁”代替“鉚焊梁”的有效工具。這對(duì)簡(jiǎn)化工地安裝工序、降低建橋成本、減輕勞動(dòng)強(qiáng)度，從而加速橋梁建設(shè)具有較大的意義。

Especially in modern bridge construction, the constant torque electric wrench is an effective tool to realize the replacement of "rivet welded beam" with "bolt welded beam". This is of great significance to simplify the site installation process, reduce the bridge construction cost, reduce the labor intensity, and accelerate the bridge construction.

定轉(zhuǎn)矩電動(dòng)扳手的轉(zhuǎn)矩以電氣裝置來(lái)進(jìn)行控制。這種電動(dòng)扳手具有耗電量少、噪聲小、調(diào)節(jié)靈活、能自動(dòng)停機(jī)、轉(zhuǎn)矩穩(wěn)定等優(yōu)點(diǎn)。

The torque of constant torque electric wrench is controlled by electrical device. The electric wrench has the advantages of low power consumption, low noise, flexible adjustment, automatic shutdown, stable torque and so on.

電動(dòng)扳手是裝卸螺紋聯(lián)接件的手持式電動(dòng)工具，廣泛應(yīng)用于汽車(chē)、拖拉機(jī)、電機(jī)電器、動(dòng)力機(jī)械、閥門(mén)、水泵、紡織機(jī)械等制造業(yè)的裝配工作中，在化工、水泥預(yù)制件、塑料成型等作業(yè)中則用于生產(chǎn)流程中裝拆真空罐、反應(yīng)釜和水泥模板、帶螺紋塑料件的脫模工作；也可用在鐵道、橋梁、建筑等工程中作水泥軌枕、桁架節(jié)點(diǎn)、角鋼腳手架等結(jié)構(gòu)的安裝、檢修和拆換工作。

Electric wrench is a hand-held electric tool for loading and unloading threaded connectors. It is widely used in the assembly of automobiles, tractors, motors and electrical appliances, power machinery, valves, water pumps, textile machinery and other manufacturing industries. In chemical industry, cement prefabricated parts, plastic molding and other operations, it is used for the assembly and disassembly of vacuum tanks, reactors and cement templates in the production process Demoulding of threaded plastic parts; It can also be used for the installation, maintenance and replacement of cement sleepers, truss joints, angle steel scaffolds and other structures in railways, bridges, buildings and other projects.

當(dāng)螺母的端面與工件端面接觸后，阻力矩急劇上升，轉(zhuǎn)動(dòng)的螺旋槽使?jié)L珠帶著主動(dòng)沖擊塊克服摩擦力和工作彈簧的壓力向后移動(dòng)，使主動(dòng)沖擊塊與從動(dòng)沖擊塊互相嚙合的牙脫離嚙合。此時(shí)，從動(dòng)沖擊塊不移動(dòng)，而主動(dòng)沖擊塊繼續(xù)向后移動(dòng)。在轉(zhuǎn)過(guò)從動(dòng)沖擊塊的牙后，由于工作彈簧的作用使主動(dòng)沖擊塊瞬時(shí)前移，并沿螺旋槽產(chǎn)生一個(gè)角加速度，主動(dòng)沖擊塊撞擊從動(dòng)沖擊塊，兩牙產(chǎn)生碰撞。然后螺旋槽又使?jié)L珠和主動(dòng)沖擊塊后移，脫離嚙合。這樣周而復(fù)始產(chǎn)生一次又一次的碰撞，獲得所需的沖擊力矩，使螺母緊固。

When the end face of the nut is in contact with the end face of the workpiece, the resistance moment rises sharply, and the rotating spiral groove makes the ball move backward with the active impact block to overcome the friction and the pressure of the working spring, so that the teeth meshed between the active impact block and the driven impact block are disengaged. At this time, the driven impact block does not move, but the active impact block continues to move backward. After turning the teeth of the driven impact block, the active impact block moves forward instantaneously due to the action of the working spring, and an angular acceleration is generated along the spiral groove. The active impact block impacts the driven impact block, and the two teeth collide. Then the spiral groove moves the ball and the active impact block backward and out of engagement. In this way, collisions occur again and again to obtain the required impact torque and tighten the nut.

如將電源開(kāi)關(guān)接到反轉(zhuǎn)位置即可擰出螺母。雙重絕緣單相串勵(lì)電動(dòng)扳手在操作手柄上裝有兩只開(kāi)關(guān)。一只為工作開(kāi)關(guān)，是操縱起動(dòng)和停止的；另一只是專(zhuān)門(mén)為改變電樞正反轉(zhuǎn)而設(shè)置的，兩只開(kāi)關(guān)不可接反。

If the power switch is connected to the reverse position, screw out the nut. The double insulated single-phase series excitation electric wrench is equipped with two switches on the operating handle. One is a working switch, which operates start and stop; The other one is specially set to change the forward and reverse rotation of the armature, and the two switches cannot be connected reversely.