CN204689498U - A kind of arm derrick crane drum shaft - Google Patents

Abstract

The utility model embodiment discloses a kind of arm derrick crane drum shaft, be adapted to winch, the reel of this winch comprises spool body and drum shaft, the first end of spool body is connected with the slow-speed shaft of reductor by drum connection structure, the first end of drum shaft is fixedly supported to the second end of spool body, second end of drum shaft is supported in drum support, the first end of the drum shaft main body of described drum shaft arranges first shaft shoulder, second end of drum shaft main body arranges second shaft shoulder and the 3rd shaft shoulder, drum shaft main body, first shaft shoulder, the external diameter of second shaft shoulder and the 3rd shaft shoulder reduces successively, and between drum shaft main body and second shaft shoulder, tapered transitional is set.The utility model improves arm derrick crane complete machine, subsystem or parts in many aspects, can the performance of improving product.

Description

A kind of arm derrick crane drum shaft

Technical field

The utility model relates to elevator machinery, particularly relates to a kind of arm derrick crane and subsystem thereof or parts.

Background technology

Arm derrick crane comprises lifting mechanism, luffing mechanism, rotating mechanism etc., relies on the interoperation of these mechanisms, can make weight lifting and carrying in certain cylindrical space.The lifting mechanism of arm derrick crane comprises winch, and the steel cable be around on reel by folding and unfolding lifts by crane workpiece.There is certain deficiency in existing boom type winch design: such as, spool body, the drum shaft structure of reel are comparatively complicated, inconvenience is not installed; And for example, the braking effect of drg is not ideal enough, and parking inhibiting device easily lost efficacy up and down, likely caused safety misadventure; For another example, steel cable winding method is reasonable not, sometimes occurs the problem that steel cable unclamps or is intertwined thereby increasing potential safety hazard; In addition, winch speed can not regulate easily; Etc..Because above-mentioned all many-sided deficiencies, be necessary to be improved hoisting crane and winch thereof.

Utility model content

For the defect that prior art exists, the object of the utility model embodiment is to improve arm derrick crane complete machine, subsystem or parts, so that the performance of improving product.

For solving above technical matters, the utility model embodiment provides a kind of arm derrick crane drum shaft, this arm derrick crane comprises chassis, turntable, winch, landing oil cylinder, jib, suspension hook, turntable is installed on chassis, winch is installed on turntable, the head end of jib is articulated with turntable, suspension hook hangs on the tail end of jib, one end of landing oil cylinder is articulated with turntable, the other end of landing oil cylinder is articulated with jib, this drum shaft is adapted to winch, the reel of this winch comprises spool body and drum shaft, the first end of spool body is connected with the slow-speed shaft of reductor by drum connection structure, the first end of drum shaft is fixedly supported to the second end of spool body, second end of drum shaft is supported in drum support, the high speed shaft of reductor is connected with the power take-off shaft of motor by coupler, series contactor between the motor protective circuit breaker of motor control loop and frequency converter, drg acts on high speed shaft on reductor, steel cable is wound in reel, top sheave group and downslide wheels, the first end of the drum shaft main body of described drum shaft arranges first shaft shoulder, second end of drum shaft main body arranges second shaft shoulder and the 3rd shaft shoulder, drum shaft main body, first shaft shoulder, the external diameter of second shaft shoulder and the 3rd shaft shoulder reduces successively, and between drum shaft main body and second shaft shoulder, tapered transitional is set.

Compared with prior art, the utility model embodiment is improved arm derrick crane, properties of product can be improved thus, it shows in the following areas: optimize lifting drum body, drum shaft and roll support, draw bail, reel layout is more reasonable, structure is more compact, installs also convenient; Improve spool body structure and steel cable canoe and press rope structure, the problem that can steel cable avoided better to unclamp or be intertwined, is conducive to eliminating safe hidden trouble; Improve drg, lifting limiting device and motor stopping control mechanism, can stop in time according to predetermined intention, brake in the situations such as spacing, sudden stop, thus effectively reduce safety misadventure; Adopt frequency converter to winch electric machine speed regulation, lifting velocity can be controlled in ground, aspect.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the utility model arm derrick crane;

Fig. 2 is the front view of the utility model winch;

Fig. 3 is the birds-eye view of the utility model winch;

Fig. 4 is the right elevation of the utility model winch;

Fig. 5 is the schematic diagram of the utility model drg;

Fig. 6 is the utility model steel cable winding structure schematic diagram;

Fig. 7 is the schematic diagram of the utility model reel and drum connection structure, pressure rope structure and drum support;

Fig. 8 is the front view of the utility model spool body;

Fig. 9 is the longitudinal sectional view of the utility model spool body;

Figure 10 is the schematic diagram of the utility model drum shaft;

Figure 11 is the utility model drum connection structure schematic diagram;

Figure 12 is the utility model pressure rope structure schematic diagram;

Figure 13 is the utility model drum support schematic diagram;

Figure 14 is the schematic diagram of the utility model lifting limiting device;

Figure 15 is the inner structure schematic diagram of the utility model lifting limiting device;

Figure 16 is the electrical schematic diagram of the utility model motor stopping control mechanism;

Figure 17 is the electrical connection graph of the limit switch of the utility model motor stopping control mechanism;

Figure 18 is the block scheme of the utility model motor speed regulation system;

Figure 19 is the schematic block circuit diagram of the utility model frequency converter;

Figure 20 is the schematic circuit diagram of the utility model inverter.

Detailed description of the invention

In order to understand know-why and the working process of the utility model embodiment better, come to be described in detail the utility model further below in conjunction with drawings and the specific embodiments.

The structure of Fig. 1-Figure 20 to the utility model winch, subsystem or parts indicates, and identical label is wherein expressed as same parts.

See Fig. 1, the structure of the utility model arm derrick crane is shown.This arm derrick crane comprises the parts such as chassis S1, turntable S2, winch S3, landing oil cylinder S4, jib S5, suspension hook S6, turntable S2 is loaded on chassis S1, winch S3 is loaded on turntable, the head end of jib S5 is articulated with turntable S2, suspension hook 6 hangs on the tail end of jib S5, one end of landing oil cylinder S4 is articulated with turntable S2, and the other end of landing oil cylinder S4 is articulated with jib S5.Turntable S2 rotates and jib S5 is rotated, oil cylinder S4 is flexible makes jib S5 landing, speed change oil cylinder (scheming not shown) makes jib S5 luffing, and winch S3 folding and unfolding is around in the steel cable of reel, jib assembly pulley and lifting hook pulley group to lift by crane the workpiece on suspension hook S6.The utility model has carried out many places improvement for winch S3 and subsystem thereof and parts, below further illustrates.

Simultaneously see Fig. 2-Fig. 4, the complete machine structure of the utility model winch is shown.This winch comprises actuating device, wind2, brake equipment and control setup (scheming not shown): actuating device is made up of the parts such as motor M 01 (being preferably variable-frequency motor), coupler 7, reductor 1, and motor M 01, coupler 7, reductor 1 connect successively; Wind2 is made up of reel 2, top sheave group 3 and the parts such as downslide wheels and steel cable, and reel 2 is in transmission connection in reductor 1 and turns around to make reel 2, and steel cable is wound on reel 2, top sheave group 3 and downslide wheels and carries out folding and unfolding; Brake equipment is made up of drg 5 and annex etc., and drg 5 acts on the high speed shaft of reductor 1 or slow-speed shaft and brakes; Control setup is provided with motor stopping control mechanism, and this motor stopping control mechanism stops motor running when the upper limit preset or lower limit.

As shown in figs 2-4, the concrete structure of this winch is: reductor 1 and drum support 4 are installed on frame S01 top, one end of reel 2 is rotationally connected with drum support 4, the other end of reel 2 is in transmission connection in the slow-speed shaft of reductor 1 by drum connection structure 8, and the high speed shaft of reductor 1 is connected with the power take-off shaft of motor M 01 by coupler (outside is provided with coupler clamshell) 7; Top sheave group 3 is positioned frame S01, and steel cable is wound in reel 2, top sheave group 3 and downslide wheels with certain style canoe, correspondingly when motor M 01 forward or reverse carries out folding and unfolding; Drg 5 is installed on reductor 1, can hold the brake wheel 6 on reductor 1 high speed shaft tightly and brake during braking.

In this winch, optimize spool body, drum shaft and roll support thereof, draw bail, reel layout is more reasonable, and structure is more compact, installs also convenient; Improve spool body structure and steel cable canoe and Ya Sheng mechanism, the problem that can steel cable avoided better to unclamp or be intertwined, is conducive to eliminating safe hidden trouble; Improve drg, lifting limiting device and motor stopping control mechanism, can stop in time according to predetermined intention, brake in the situations such as spacing, sudden stop, thus effectively reduce safety misadventure.Below further describe.

Fig. 2-Fig. 4 illustrates drg mounting structure, and this drg 5 is installed on the high speed shaft of reductor 1, by holding brake wheel 6 tightly, reductor 1 is braked, and makes the reel 2 on the slow-speed shaft of reductor 1 brake thus.Below further the structure of drg is described in detail.

See Fig. 5, the structure of the utility model drg is shown.In this drg 5, the first brake control lever 52, first brake control lever 53, the band driving telescopic rod (can be cylinder or oil cylinder) 59 of actuating device 50, one end of driven expansion link 58 are articulated with Brake Block 51 respectively; The other end of the first brake control lever 52, driving telescopic rod 59, driven expansion link 58 is articulated with an arm of L shape connecting rod 57 respectively; The other end and the linear connecting rod 55 of the second brake control lever 53 are hinged, the other end of linear connecting rod 55 and another arm of L shape connecting rod 57 hinged; First slipper 56 is installed on the inner side of the first brake control lever 52, and the second slipper 54 is installed on the inner side of the second brake control lever 53, and the intrados of this first slipper 56 and the intrados of the second slipper 54 hold the brake wheel 6 on reductor 1 high speed shaft tightly when braking.This brake mode structure is simple, and braking response is fast, and effect is better.

See Fig. 6, the utility model steel cable winding structure is shown.In this steel cable winding structure, steel cable 10 is wound in reel 2 by following manner, top sheave (jib pulley) organize 3 and lower sheave (lifting hook pulley) organize 9: the first end of steel cable 10 is around in the first end of reel 2 and is fixed on the first pressure rope position 2a, second end of steel cable 10 is around in the second end of reel 2 and is fixed on reel 2 second pressure rope position 2d, steel cable 10 lays out from reel 2 first conductor rope position 2b anticlockwise direction, conter clockwise walks around the first lower sheave 91 successively, first top sheave 31, second lower sheave 92, second top sheave 32, cw walks around the 3rd lower sheave 93 successively again, 3rd top sheave 33, after 4th lower sheave 94, another mistake hour hands wraparound reel 2 second conductor rope position 2c.Steel cable 10 adopts this canoe, can reduce the probability of occurrence that steel cable was wound around, unclamped etc. bad phenomenon.

See Fig. 7, the utility model reel and drum connection structure, pressure rope structure and drum support are shown.Reel 2 comprises spool body 21 and drum shaft 22, the first end of this drum shaft 22 is fixedly supported to the second end of spool body 21, the first end of spool body 21 is connected with the slow-speed shaft of reductor 1 by drum connection structure (the I part in Fig. 6), second end of drum shaft 22 is supported in drum support (the III part in Fig. 6), installs very convenient.In addition, the top, two ends of spool body 21 arranges pressure rope structure (the II part in Fig. 6) respectively, can fix the end of steel cable 10 preferably.

Simultaneously see 8-Fig. 9, the structure of the utility model reel is shown.This spool body 21 arranges the first end plate 25, second end plate 24 and stay bearing plate 23, first end plate 25 of spool body 21 is connected by the slow-speed shaft of drum connection structure with reductor 1, second end plate 24 of spool body 21 and stay bearing plate 23 fixed pedestal drum shaft 22, this drum shaft 22 is installed on drum support, installs very convenient.

As shown in Fig. 2-Fig. 9, this spool body 21 arranges steel cable guide groove 211 above, is convenient to steel cable 10 and introduces along steel cable guide groove 211/draw, be conducive to steel cable 10 thus and be wound around in an orderly manner.

See Figure 10, the structure of the utility model drum shaft is shown.This drum shaft 22 comprises drum shaft main body 222, the first end of drum shaft main body 222 arranges first shaft shoulder 221, second end of drum shaft main body 222 arranges second shaft shoulder 224 and the 3rd shaft shoulder 225, wherein, the external diameter of drum shaft main body 222, first shaft shoulder 221, second shaft shoulder 224 and the 3rd shaft shoulder 225 reduces successively, and between drum shaft main body 222 and second shaft shoulder 224, tapered transitional 223 is set, this drum shaft 22 structural strength is better, also convenient installation.

See Figure 11, the utility model drum connection structure is shown.In this drum connection structure, connect semiaxis 84 and be supported in terminal pad 82 by cylindrical roller bearing 87, and the medial end connecting semiaxis 84 arranges baffle plate 86, connect joint portion, inner side inner cover plate 85 shutoff of semiaxis 84, cylindrical roller bearing 87 and terminal pad 82, connect joint portion, outside outer cover plate 83 shutoff of semiaxis 84, cylindrical roller bearing 87 and terminal pad 82, terminal pad 82 is fixed with flange 81, and flange 81 is anchored on the first end plate 25 on spool body 21.This structure connects reliable, easy for installation.

See Figure 12, the utility model pressure rope structure is shown.This pressure rope structure 11 comprises steel cable pressing plate 111, the lower surface of steel cable pressing plate arranges steel cable indent 1121, this steel cable pressing plate 111 is anchored in the screw of spool body 21 by bolt 112, makes steel cable 10 be reliably fixed on spool body 21 and can not deviate from, increases safety factor thus.

See Figure 13, the utility model drum support is shown.In this drum support 4, supporting base 41 is arranged support bearing seat 43, drum shaft bearing 44 is supported in support bearing seat 43, drum shaft 22 is supported in drum shaft bearing 44 by tapered roller bearing 45, support bearing seat 43, joint portion, inner side inner cover plate 42 shutoff of drum shaft bearing 44 and tapered roller bearing 45, support bearing seat 43, joint portion, outside outer cover plate 47 shutoff of drum shaft bearing 44 and tapered roller bearing 45.This compact conformation, it is convenient to install.

As shown in figure 13, the present embodiment illustrates the mounting structure of lifting limiting device.In Figure 12, drum shaft 22 is arranged drum shaft gusset piece 46, in order to install the drive end (rocking bar as screw lifting limiting device 12) of lifting limiting device 12, when reel 2 rotational angle exceedes predetermined value (revolution), electrical connection can be disconnected to prevent reel from rotating further, can limit adjustable height like this.Below in conjunction with Figure 12-Figure 14, further describe.

See Figure 14-Figure 15, the utility model lifting limiting device structure is shown.Simultaneously with reference to Figure 12, this lifting limiting device 12 comprises U-shaped support 121, rocking bar 122, screw rod 123, runner 124, limiting device housing 125, pilot bar 126, push pedal 127, active conductive post 128, limit switch 129 and fixing conductive pole 120:U shape support 121 are fixed on the outer cover plate 47 be connected with drum shaft 22, limiting device housing 125 by screw fastening in U-shaped support 121, screw rod 123 is supported on limiting device housing 125, push pedal 127 is installed on screw rod 123, active conductive post 128 one end is connected to push pedal 127, active conductive post 128 other end is supported on an arm of the limit switch 129 be connected with limiting device housing 125, fixing conductive pole 120 is fixed on another arm of limit switch 129, runner 124 is installed on the end of screw rod 123, one end of rocking bar 122 connects runner 124 prejudicially, the other end of rocking bar 122 is connected with drum shaft gusset piece 46.

In addition, limiting device pedestal 125 also installs pilot bar 126, this pilot bar 126 be arranged in parallel with screw rod 123, and push pedal 127 is arranged in pilot bar 126 and slides, to ensure to move reposefully.

In this embodiment, the position of push pedal 127 can be adjusted in advance.When reel 2 scrolling, rocking bar 122 rotates with drum shaft gusset piece 46, by runner 124, screw rod 123 is rotated, and push pedal 127 translation drives active conductive post 128 to depart from fixing conductive pole 120, disconnect electrical connection thus and play position-limiting action, improving safety performance thus.

The structure of Figure 14-Figure 15 to lifting limiting device 12 is illustrated, and namely this lifting limiting device can be used for upper limit, also can be used for lower limit.The limit switch being about to lifting limiting device is connected to the control loop of the motor M 01 of winch, stops motor M 01 to run, play safety guard-safeguard effect thus by the motor protective circuit breaker triggered in motor control loop.

The utility model for preventing, the spacing situation of spacing appearance, improve in electric control system simultaneously, be described as follows.

Simultaneously see Figure 16-Figure 17, the circuit structure of the utility model motor stopping control mechanism is shown.This motor stopping control mechanism can be used for winch, also can be used for the jacking system of other type, and its electrical structure is: in the control loop of motor M 01, adds a contactless switch KM01 between motor protective circuit breaker QF01 and frequency converter VF01; Upper the next limit switch SQ01, SQ02 are connected in series in the control loop of this contactless switch KM01.Herein; the terminal 1-6 of motor protective circuit breaker QF01; A1, A2 (three groups of terminals 1,2) of contactless switch KM01; terminal R, S, T, V, W, PE of frequency converter VF01; the terminal 11,12 of limit switch SQ01, SQ02; and the terminal 13,14 of spacing unlock key knob SB01 is connected according to Figure 15 with Figure 16, no longer specifically launches explanation.

After limit switch SQ01 or SQ02 is triggered, directly cut off the coil power of contactless switch KM01, contactless switch KM01 discharges, and cuts off the power supply in frequency converter VF01 loop thus, thus stops the operation of motor M 01 fast; After this, can be unlocked by rotary stopper unlock key knob SB01.This mode, decrease the intermediate link of process limit signal, time fault is occurred, motor can stop at once, avoids the damage of equipment and the injures and deaths of personnel.

Conveniently change the speed of winch S3, the utility model adopts motor variable-frequency speed-regulating to control.Below be described.

See Figure 18, the block scheme of the utility model motor speed regulation system is shown.This motor speed regulation system comprises the power supply M03, frequency converter M02 and the motor M 01 that connect successively, this frequency converter M02 adopts AC-DC-AC mode, first industrial frequency AC power supply M03 is converted to direct supply by rectifier, and then convert direct supply to frequency, the equal controollable source of AC of voltage to supply motor M 01 by inverter, like this by changing frequency can change the rotating speed of motor M 01.

As shown in figure 18, the input stage of this frequency converter M02 is provided with filtering decoupling circuit, it is preferably RC filtering decoupling circuit, is made up of the current-limiting resistance R be connected in series and filter capacitor C, makes the output plus terminal of power supply M03 thus and exports current-limiting resistance R and the filter capacitor C that ground termination enters serial connection.This filtering decoupling circuit, as the preposition simulation low-pass filter of AC signal input channel, has jamproof effect concurrently; Access decoupling capacitance between alternating current-direct current signal input channel two terminals, can be high frequency differential mode interfering signal and bypass is provided.

See Figure 19, the schematic block circuit diagram of the utility model frequency converter is shown.The frequency converter M02 of the present embodiment comprises the parts such as rectifying circuit M021, power factor correction circuit M022, filter circuit M023, inverter circuit M024 and microcontroller circuit M025, man-machine interface circuit M026, wherein: rectifying circuit M021 is piled by rectifier diode or bridge and forms (being preferably full bridge rectifier), comprise necessary interference filtering circuit, its radical function is that alternating current is converted to direct current (DC); Circuit of power factor correction M022 is selectable unit (SU), be made up of power semiconductor and control chip, it is also connected to the power factor correction end of microcontroller circuit M025, and effect makes received current close to sinusoidal waveform, reduce mains by harmonics content, realize the object improving power factor; Filter circuit M023 (being preferably RC filter circuit), primarily of element compositions such as chemical capacitors, completes galvanic filtering and energy storage effect; Inverter circuit M024 is made up of power model and driving circuit, its power model can be intelligent power driving tube chip, and it is also connected to the drive singal end of described microcontroller circuit, and its radical function is, complete the conversion of direct current (DC) to three plase alternating current, realize frequency modulation and voltage modulation object; Microcontroller circuit M025 is made up of microprocessor (DSP) and peripheral circuit; its order of sending according to man-machine interface circuit M026; send corresponding command signal; control circuit of power factor correction M022 and inverter circuit M024 to work; and according to electronic feedback information, carry out necessary circuit protection and fault handling.Like this, this embodiment controls the output mode of frequency converter M02 by microcontroller circuit, is conducive to neatly by pre-provisioning request output voltage, thus meets the demand of different user.

See Figure 20, the schematic circuit diagram of the utility model inverter are shown.Specifically for the inverter circuit M024 of motor M 01 and the example of microcontroller circuit, its mode of operation is: civil power becomes direct current (DC) through rectifying circuit M021, after chemical capacitor filtering, the power input of access inverter circuit M024, accesses filter capacitor between its power input.And the microprocessor of microcontroller circuit is according to the setting signal of man-machine interface circuit, motor M 01 is controlled.

In the present embodiment, inverter circuit M024 comprises power tube driving chip, this power tube driving chip is connected to the microprocessor (MCU/DSP) of microcontroller circuit, so that the pulse width modulating signal exported according to microprocessor, drives corresponding power tube alternate conduction and shutoff.Concrete, described inverter circuit M024 comprises six power tube Q1 ~ Q6, and these six power tubes are divided into three groups, and every group power controls a phase winding of three phase electric machine M01.

The concrete connection mode of each power tube is: the source electrode of power tube Q1, Q2, Q3 connects one end of direct supply jointly, the drain electrode of power tube Q4, Q5, Q6 connects the other end of direct supply jointly, the point of connection of the drain electrode of power tube Q1 and the source electrode of power tube Q4 connects the U phase terminal of motor, the point of connection of the drain electrode of power tube Q2 and the source electrode of power tube Q5 connects the V phase terminal of motor, and the drain electrode of power tube Q3 and the source electrode point of connection of power tube Q6 connect the W phase terminal of motor; The grid of power tube Q1, Q2, Q3, Q4, Q5, Q6 connects a mouth of power tube driving chip respectively, and each input end of this power tube driving chip controls by output pulse width conditioning signal PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 Zhong mono-tunnel of microcontroller circuit respectively.These six power tube Q1 ~ Q6 source electrode and drain electrode between corresponding access diode D1 ~ D6.

During start, microprocessor produces corresponding 6 road pulse width modulating signals according to the motor speed of setting, i.e. drive singal PWM1 ~ PWM6; 6 power tube (MOSFET or IGBT) Q1 ~ Q6 of inverter M024 are driven by power tube driving chip; The alternate conduction of these power tubes and shutoff, produce three-phase modulations waveform, output voltage is adjustable, the three plase alternating current of changeable frequency, outputs to U, V, W terminals of motor M 01, thus realizes the stepless frequency control of motor M 01.

Although the utility model with preferred embodiment openly as above; but it is not for limiting the utility model; any those skilled in the art are not departing from spirit and scope of the present utility model; can make possible variation and amendment, the scope that therefore protection domain of the present utility model should define with the utility model claim is as the criterion.

Claims (5)

1. an arm derrick crane drum shaft, this arm derrick crane comprises chassis, turntable, winch, landing oil cylinder, jib, suspension hook, turntable is installed on chassis, winch is installed on turntable, the head end of jib is articulated with turntable, suspension hook hangs on the tail end of jib, one end of landing oil cylinder is articulated with turntable, the other end of landing oil cylinder is articulated with jib, it is characterized in that, this drum shaft is adapted to winch, the reel of this winch comprises spool body and drum shaft, the first end of spool body is connected with the slow-speed shaft of reductor by drum connection structure, the first end of drum shaft is fixedly supported to the second end of spool body, second end of drum shaft is supported in drum support, the high speed shaft of reductor is connected with the power take-off shaft of motor by coupler, series contactor between the motor protective circuit breaker of motor control loop and frequency converter, drg acts on high speed shaft on reductor, steel cable is wound in reel, top sheave group and downslide wheels, the first end of the drum shaft main body of described drum shaft arranges first shaft shoulder, second end of drum shaft main body arranges second shaft shoulder and the 3rd shaft shoulder, drum shaft main body, first shaft shoulder, the external diameter of second shaft shoulder and the 3rd shaft shoulder reduces successively, and between drum shaft main body and second shaft shoulder, tapered transitional is set.

2. drum shaft as claimed in claim 1, is characterized in that, drum shaft is arranged drum shaft gusset piece, in order to install lifting limiting device drive end.

3. drum shaft as claimed in claim 2, it is characterized in that, in described drum support, supporting base is arranged support bearing seat, drum shaft bearing is supported in support bearing seat, drum shaft is supported in drum shaft bearing by tapered roller bearing, joint portion, the inner side inner cover plate shutoff of support bearing seat, drum shaft bearing and tapered roller bearing, joint portion, the outside outer cover plate shutoff of support bearing seat, drum shaft bearing and tapered roller bearing.

4. drum shaft as claimed in claim 3, it is characterized in that, steel cable lays out from reel first conductor rope inverse position clockwise, conter clockwise walks around the first lower sheave, the first top sheave, the second lower sheave, the second top sheave successively, after cw walks around the 3rd lower sheave, the 3rd top sheave, the 4th lower sheave successively again, another mistake hour hands wraparound reel second conductor rope position.

5. drum shaft as claimed in claim 4, it is characterized in that, the first end of steel cable is around in the first end of reel and is fixed on the first pressure rope position, and the second end of steel cable is around in the second end of reel and is fixed on reel second pressure rope position.