CN201128111Y - Gear strengthening shot blasting machine - Google Patents

Abstract

The utility model belongs to a device for cleaning the surface of mechanical parts by means of shot blasting, in particular to a gear strengthening shot blasting machine. According to the technical scheme provided by the utility model, there is a shot blasting device in the shot blasting cleaning room, which is characterized in that: the upper part of the shot blasting cleaning room has a hanging conveyor installed on the bracket, and the hanging conveyor is enclosed in a closed shape. Around the shot blasting cleaning room, there is a section passing through the shot blasting cleaning room, and a number of rotating hangers that can be rotated under the drive of the hanging conveyor are suspended on the hanging conveyor; there is a curtain above or above the shot blasting cleaning room Separator, there is a bucket elevator on the side of the shot blasting cleaning room, and a screw conveyor at the bottom of the shot blasting cleaning room; the input end of the curtain sorter is connected with the output end of the bucket elevator, and the output of the screw conveyor is The end is connected with the input end of the chamber hoist. The utility model can improve the effect of shot blasting cleaning and product quality.

Description

Gear strengthening shot blasting machine

technical field

The utility model belongs to a device for cleaning the surface of mechanical parts by means of shot blasting, in particular to a gear strengthening shot blasting machine.

Background technique

The shot blasting machine is mainly used to strengthen the tooth surface of the automobile gear after heat treatment. Most of the traditional shot blasting machines adopt double-station, hanging-type step-by-step operation mode, mainly composed of shot blasting device, conveying catenary, shot blasting cleaning room, workpiece hanger, hoist, cyclone dust collector, filter cartridge dust removal It is composed of components such as a device, a curtain sorter, a workpiece rotating mechanism, and an electric control cabinet. Each hook gear receives shot blasting from two station shot blasters in turn. At each station, a string of gears is hung with hooks. During shot blasting, the gears rotate on their own, and the shot blaster blasts each part of the gears. Strengthening the gear after shot blasting can eliminate the residual stress on the tooth surface, improve the strength of the gear, and prolong the service life.

Products imported from abroad have problems such as expensive prices, difficult supply of spare parts, and poor channels; domestic products have problems such as incomplete functions, low work efficiency, and high energy consumption. Turntable shot blasting machines are mostly used for gear shot blasting, which has problems such as low work efficiency, uneven coverage, and low initial velocity of shot particles; the distance between the workpiece and the shot blasting machine is far away, and the shot blasting angle is not good, which affects the shot blasting effect.

Contents of the invention

The purpose of the utility model is to design a gear strengthening shot blasting machine to improve the effect of shot blasting cleaning and product quality.

According to the technical scheme provided by the utility model, there is a shot blasting device in the shot blasting cleaning room, which is characterized in that: the upper part of the shot blasting cleaning room has a hanging conveyor installed on the bracket, and the hanging conveyor is enclosed in a closed shape. Around the shot blasting cleaning room, there is a section passing through the shot blasting cleaning room, and a number of rotating hangers that can be rotated under the drive of the hanging conveyor are suspended on the hanging conveyor; there is a curtain above or above the shot blasting cleaning room Separator, there is a bucket elevator on the side of the shot blasting cleaning room, and a screw conveyor at the bottom of the shot blasting cleaning room; the input end of the curtain sorter is connected with the output end of the bucket elevator, and the output of the screw conveyor is The end is connected with the input end of the bucket hoist; the shot blasting port of the shot blaster is located in the shot blasting cleaning room and points to the workpiece suspended on the rotating rack; the side of the filter cartridge dust collector is also equipped with a fan and a filter cartridge dust collector It is connected with the cyclone dust collector, and the air inlet of the cyclone dust collector is installed in the shot blasting room through a pipe; the pipe is also connected with the curtain separator.

An electric control cabinet is installed on the side of the shot blasting room. The hoist includes a hoist housing and a transmission belt located in the hoist housing. The belt is looped around the squirrel-cage rollers installed at the upper and lower ends of the hoist housing. There are a number of hoisting buckets on the belt that can accommodate materials. There is a motor and a reducer for driving the squirrel cage roller and chain on the hoist housing; there is also an inspection door for maintenance and replacement of the hoist bucket or belt on the hoist housing.

In the suspended conveyor, the motor, sprocket and guide rail are installed on the bracket, there is a chain on the sprocket, and the autorotation mechanism is suspended on the guide rail, and the autorotation mechanism is connected with the chain at the same time. Mechanism, in this heavy hammer type tensioning mechanism, there are mutually connected carriages and traction ropes, the weights are suspended below the traction ropes, and the carriages that can slide on the supports are connected with chains.

There is a waste material port on the side of the curtain sorter, a shot bin in the middle of the curtain sorter, and a distribution pipe for steel shot at the lower part of the shot bin. The lower end of the distribution pipe is equipped with a pneumatic shot valve and is connected with The shot blaster is connected. In the shot blasting machine, the inner wall of the shot blasting machine shell is lined. In the shot blasting machine shell, there is an impeller mounted on the bearing seat by means of a rotating shaft and bearings. Blades are installed on the impeller, and a shot wheel is installed at one end of the rotating shaft. , the motor is connected with the belt pulley installed on the rotating shaft by the belt pulley and the belt, and there is a directional sleeve at the steel shot outlet of the shot blaster shell.

The shot blasting room includes a main cleaning room and two auxiliary cleaning rooms. Two blasting devices corresponding to the workpieces of the two stations are installed on one side of the main cleaning room, and the shot blasting devices are fixed on the shot blasting machine. On the body plate of the cleaning room, there is a liner for the sweeping area in the shot blasting cleaning room; a cleaning room door driven by a cylinder is set on the shot blasting cleaning room, and there is a steel shot bucket at the entrance and exit of the cleaning room door. There is a polyurethane airtight door at the entrance and exit of the pill cleaning room. In the screw conveyor, the motor and its reducer are installed on the bracket, the output sprocket of the reducer is connected with the sprocket installed at the end of the screw by a chain, and the screw is installed on the bracket.

In the rotation mechanism, the upper end of the suspension rod is fixedly connected to the shaft sleeve, and the upper end of the shaft sleeve is fixedly connected to the sprocket. The bearing and the hanging rod are used inside the shaft sleeve. The upper end of the hanging rod has a roller, which is used to hang on the suspension conveyor. On the guide rail in the machine, the lower end of the boom passes through the sealing strip set on the bracket, and the hook is connected to the lower end of the boom; the motor and the reducer are installed on the bracket, and the sprocket and chain are used at the output end of the reducer. It is connected with the sprocket wheel installed on the bracket, and another sprocket wheel coaxial with the sprocket wheel is connected with the sprocket wheel on the hanging rod by chain again.

The utility model has the advantages of low energy consumption of the equipment, high work efficiency and high quality of processed products.

Description of drawings

Fig. 1 is a structural diagram of the utility model. Figure 2 is the left view of Figure 1.

FIG. 3 is a top view of FIG. 1 . Figure 4 is the structure diagram of the curtain sorter.

Figure 5 is a structural diagram of the screw conveyor. Figure 6 is a top view of the shot blaster.

Figure 7 is a front view of the shot blaster. Figure 8 is a structural diagram of the hoist.

Fig. 9 is a structural diagram of the rotating hanger. Figure 10 is a structural diagram of the suspended conveyor.

Figure 11 is a structural diagram of the shot blasting chamber. Figure 12 is a structural diagram of the shot blasting chamber.

Detailed ways

In the figure: 1. The electric control cabinet is used to control the actuators and monitor the whole process of shot blasting; 2. The fan is used for the ventilation and dust removal of the filter cartridge dust collector, cyclone dust collector, shot blasting cleaning box, and curtain separation. The selector provides air source; 3. Filter cartridge dust collector, which filters fine dust, so that the gas discharge meets the national discharge standard; 4. Cyclone dust collector, large particles of dust are discharged out of the cylinder after rapid cyclone settlement; 5. Spiral conveying 6. Shot blasting room, the workpiece is impacted by projectiles in the shot blasting room to achieve the effect of cleaning and strengthening the tooth surface; 7. Suspension conveying 8. Curtain sorter, the projectiles after impact form a curtain through the sorter, and the qualified projectiles are separated from the broken particles and oxide skin by suction. Separation; 9. Rotate the hanger, place the gear on the rotating hanger, step into the shot blasting room for every two sets of double stations, and position and rotate at the shot blasting place; after a cycle, step into the shot blasting room, 10. Q034 reinforced shot blasting device, which is the core component of the equipment, enables the pellets thrown to the workpiece to obtain an adjustable initial velocity of 100m/s, removes the oxide skin on the surface of the workpiece, eliminates the stress on the tooth surface, and strengthens the tooth surface. Surface strength; 11. Bucket elevator, which lifts the projectiles conveyed by the screw conveyor to a certain height, and then sends them to the curtain sorter 8 to sort the pellets; 12. The workpiece rotation mechanism, the chain of the rotation mechanism Drive the sprocket on the upper end of the rotating rack to rotate, so that the workpiece (automobile gear) rotates at a steplessly adjustable initial speed of 5.2r/min, ensuring the minimum coverage of the workpiece ≥ 150%. 13. Settling chamber, to separate the qualified steel shot for reuse. 14. The pneumatic pill valve is realized by the opening of the cylinder to control the on and off of the pellets. The control of pellet flow size can be realized by adjusting the cylinder position.

The flow direction of the pellets during work is: after the shot blasting machine 10 blasts, the steel shot falls into the screw conveyor 5, and then is sent to the curtain sorter 8 by the bucket elevator 11, and then passes through the pneumatic shot valve 14 to the shot blasting machine. and the dust therein passes through the settling chamber 13, the cyclone dust collector 4, the filter cartridge dust collector 3, and then is discharged by the fan 2.

The direction of the workpiece is: hang the workpiece on the rotating hanger 9, step under the chain drive of the suspension conveyor 7, enter the fixed position of the shot blasting cleaning room 6 and then rotate, and receive the shot blasting device 10 in the shot blasting cleaning room 6 The shot blasting leaves the shot blasting chamber 6 after cleaning, and then takes off from the rotary hanger 9.

The shot blasting cleaning chamber 6 is divided into a main cleaning chamber 68 and two auxiliary cleaning chambers 67, about 3.7 meters long, 1.1 meters wide, and 1.5 meters high. One side of the main cleaning chamber 68 respectively installs two blasting devices 10 corresponding to the workpieces of the two stations, and the blasting device 10 is fixed on the chamber body plate 69 of the blasting cleaning chamber 6. There is a sweeping area liner 70 in the cleaning room 6; a cleaning room door 66 driven by a cylinder is arranged on the shot blasting cleaning room 6, and there is a steel shot bucket 72 at the entrance and exit of the cleaning room door 66. The sealing protection at 68 import and export places all adopts polyurethane sealing door 71. The main structural parts are welded by 14# channel steel and 10mm thick steel plate, the chamber plate 69 of the fixed shot blasting device 10 is changed to 25mm thick, the cleaning chamber door 66, and the door plate adopts 6mm thick steel plate, which has sufficient rigidity and strength. The liner plate 70 of the sweeping area in the shot blasting chamber 6 is made of high wear-resistant manganese steel plate Mn13 instead of the traditional high chromium guard plate, and the service life is more than 3 years. The effect of auxiliary cleaning chamber 67 is to reduce the steel shot of splash. The angles and positions of all the arrangements of the shot blasting device 10 maximize the utilization rate of the steel shot and reduce the wear on the lining plate 70 of the blasting area in the shot blasting chamber 6 . The cleaning chamber door 66 is driven by an air cylinder to open the door, which has light weight, good stability, novel structure, good sealing effect and high degree of automation.

Described shot blasting device 10 is the core component of shot blasting machine, and shot blasting device 10 is mainly made up of motor 30, pulley 28, belt 29, belt pulley 31, bearing housing 27, rotating shaft 33, impeller 34, blade 35, shot wheel 36 , directional sleeve 38, shot blasting machine shell 26 and inner lining 37 and other components. The inner wall of the shot blaster shell 26 has a liner 37, and in the shot blaster shell 26, there is an impeller 34 installed on the bearing seat 27 by using a rotating shaft 33 and a bearing 32. Shot wheel 36 is arranged, and motor 30 utilizes belt pulley 31 and belt 29 to be connected with belt pulley 28 installed on the rotating shaft 33, and orientation sleeve 38 is arranged at the steel shot outlet of shot blasting device shell 26. The weight difference of each set of blades is controlled within 3g, which greatly reduces the noise and vibration during equipment operation and prolongs the service life of wearing parts. The effect of orientation sleeve 38 is to adjust and control the shooting direction of the blasting beam projection angle. The rotating speed of the impeller 34 of the blasting machine reaches 3500r/min.

Projectile cycle purification system: The projectile cycle purification system is composed of screw conveyor 5, bucket elevator 11, curtain sorter 8, shot storage bucket 17, shot drop pipe 19, and pneumatic shot valve 14.

The screw conveyor 5 is commonly called as the auger, and its function is to collect the steel shot that falls from the shot blasting chamber cleaning 6 and transport it to the hoist 11. In the screw conveyor 5, the motor 20 and its reducer 21 are installed on the support, and the output sprocket of the reducer 21 is connected with the sprocket installed on the end of the screw rod 23 by a chain 22, and the screw rod 23 is installed on the support. Screw conveyor 5 drives screw rod 23 to rotate by motor 20, speed reducer 21, chain 22.

Elevator 11 lifts the steel shot sent by screw conveyor 5 and unloads it to curtain sorter 8. Elevator 11 includes an elevator housing 47 and a drive belt 46 located in the elevator housing 47. The belt 46 surrounds the On the squirrel cage roller 40 installed at the upper and lower ends of the hoist housing 47, there are a number of hoisting hoppers 45 that can accommodate materials on the belt 46, and on the hoist housing 47 are used to drive the squirrel cage drum 40 and chain 44 The running motor 43 and the speed reducer 42 thereof; on the hoist housing 47, there is also an inspection door 41 for maintenance and replacement of the hoist bucket 45 or the belt 44. The squirrel cage roller 40 can ensure that the conveyor belt does not slip during work. This not only improves the friction between the tape and the pulley, avoids the slipping phenomenon of the old-fashioned light pulley, but also reduces the pre-tightening force of the belt and prolongs the service life of the tape. In order to prevent the pellets from being blocked due to the slipping of the elevator pulley, an automatic detection and shutdown alarm device is also provided.

The function of the curtain separator 8 is to sieve the coarse debris and distribute the steel shot to the two shot tubes evenly to ensure that each shot blaster 10 works normally. Dust is sucked into the dust collector. The working principle of the curtain sorter 8 is: the steel shot flows into the curtain sorter 8 from the elevator 11, and the dust removal fan 2 effectively separates the steel shot, metal oxide scale fragments, broken pellets and dust in the flow curtain , fine pellets and dust flow out from the dust outlet 18, and the steel shot enters the shot bin 17 for circulation. The lower part of the shot bin 17 is provided with two steel shot distribution steel pipes 19, and the lower ends of the distribution pipes are respectively equipped with cylinder shot valves 14, and the on and off of the steel shots are controlled by the cylinder; the control of the flow of the steel shot can be changed by adjusting the position of the cylinder Open the size of the opening to realize the flow, and finally flow into two shot blasting machines 10.

Suspension conveyor 7 adopts XT100 suspension conveyor, and the conveying speed of the conveyor is continuously adjustable by frequency conversion and speed regulation between 1 and 6m/min. When working normally, it will automatically proceed according to the cycle of fast forward-slow forward-stop. The catenary adopts a heavy hammer tensioning mechanism. The gear and the pinion shaft are equipped with 10 sets of spreaders respectively. Motor 62, sprocket wheel and guide rail are installed on support 61, and chain 63 is arranged on sprocket wheel, and heavy hammer type tensioning mechanism is also installed on support 61, and there is the sliding frame 64 that interconnects in this heavy hammer type tensioning mechanism And the traction rope 65, the weight is suspended below the traction rope 65, and the carriage 64 can slide on the support 61.

Autorotation mechanism 9: driven by motor 58 and cycloidal pinwheel reducer 57, chain 56 drives sprocket 55 to rotate the spreader, and the autorotation speed is continuously adjustable by frequency conversion between 2-6r/min. The disengagement and closing of the rotation mechanism adopts pneumatic. In the spreader, the upper end of the suspender 50 is fixedly connected to the shaft sleeve 51, and the upper end of the shaft sleeve 51 is fixedly connected to the sprocket 52, and a bearing is installed inside the shaft sleeve 51 to connect with the hanging rod 53, and the upper end of the hanging rod 53 has a roller 54, and utilize the roller 54 to hang on the guide rail, the lower end of the suspender 50 passes through the sealing strip 49 arranged on the bracket 61, and connects the suspension hook 48 at the lower end of the suspender 50. Motor 58 and speed reducer 57 are installed simultaneously on support 61, utilize sprocket wheel and chain 56 to be connected with sprocket wheel 55 that is installed on the support at the output end of speed reducer 57; The wheel 52 is connected to drive the workpiece to rotate.

Dust removal system: use settling chamber 13, cyclone separator 4 and filter cartridge dust collector 3 for multi-stage dust removal. The function of the settling chamber 13 is to separate the qualified steel shot for reuse, so as to avoid excessive loss of the steel shot. The cyclone separator 4 separates particles such as larger broken steel shots in advance to prolong the service life of the filter cartridge. The filter cartridge dust collector 3 is the final filter for filtering fine dust so that the gas discharge meets the national emission standards. The dust accumulated on the cylinder wall is removed by compressed air pulse recoil to ensure system resistance and work stability. The dust emission concentration complies with the relevant national standards (GB1627-1966), the fan of the dust collector has low noise and long service life.

The electrical control system in the electric control cabinet 1 adopts a programmable controller, including PLC, frequency converter and so on. The speed of the shot blaster 10 is steplessly adjustable by frequency conversion. When the rotation mechanism 9 does not rotate, it can report to the police and stop working. The design and manufacture of the control system conform to the IEC international electrical standard.

The strengthening of the tooth surface of the gear is mainly to increase the shot blasting force by increasing the shot blasting initial velocity of the steel shot and shortening the distance between the shot blasting device 10 and the workpiece. However, the increase of the initial velocity will increase the noise, and the shortening of the distance will affect the service life of the protective plate; therefore, the key is to rationally design and select the initial velocity and distance to meet the requirements of gear strengthening.

The utility model has the following characteristics:

1. Due to the increase of the diameter of the pulley of the shot blaster, the speed of the impeller of the shot blaster and the initial velocity of projectile ejection are increased, thereby enhancing the force of the steel shot hitting the workpiece. The speed of the impeller of the traditional shot blasting machine is 2500-2900 rpm, and the initial velocity of the steel shot is 73-85 m/s; m/s.

2. Since the installation distance between the shot blaster and the workpiece is shortened (when the amount of shot blasting is constant, the number of projectiles received by the surface of the workpiece is inversely proportional to the square of the distance from the workpiece to the shot blaster), and the striking force is strengthened, thus Improved cleaning performance. The installation distance between the traditional shot blasting device and the workpiece center is 600-2000 mm; the installation distance between the utility model shot blasting device and the workpiece center is 350 mm.

3. The productivity has been significantly improved. In the prior art, the loading weight of each station is ≥30kg, and the beat is ≥12 stations/hour; in the utility model, the loading weight of each station is ≥80kg, and the beat is ≥15 stations /Hour.

4. After shot blasting, the quality of the tooth surface of the gear is guaranteed. In the existing technology, the arc height of Alme test piece: 0.254-0.38mmA, the minimum coverage rate: ≥100%, and the surface of the tooth root part with residual stress ≥- 100Ksi (≥-689Mpa); in the present utility model, Alme test piece arc height: 0.35-0.52mmA, minimum coverage: ≥150%, part residual stress tooth root surface ≥-120Ksi (≥-864MPa).

Claims (9)

1. The gear-strengthened shot blasting machine includes a shot blasting chamber (6) and its shot blasting device (10). machine (7), the suspension conveyor (7) surrounds the shot blasting cleaning room (6) in a closed shape, and a section passes through the shot blasting cleaning room (6), and is suspended on the suspension conveyor (7). Some rotary hangers (9) that can rotate under the drive of the suspension conveyor (7); Curtain sorters (8) are arranged above or above the shot blasting chamber (6), ) has a bucket elevator (11) on the side, and a screw conveyor (5) is arranged at the bottom of the shot blasting chamber (6); the input end of the curtain sorter (8) and the output end of the bucket elevator (11) connection, the output end of the screw conveyor (5) is connected with the input end of the bucket elevator (11); the blasting port of the shot blaster (10) is located in the shot blasting cleaning chamber (6), and is pointed to hang on the rotating rack (9) on the workpiece; the side of the filter cartridge dust collector (3) is also provided with fan (2) communicated with the filter cartridge dust collector (3) and the cyclone dust collector (4), and the cyclone dust collector (4) The air inlet is arranged in the shot blasting chamber (6) by means of a pipeline; the pipeline communicates with the curtain sorter (8) at the same time. 2. The gear strengthening shot blasting machine according to claim 1, characterized in that: an electric control cabinet (1) is installed on the side of the shot blasting cleaning room (6). 3. The gear strengthening shot blasting machine according to claim 1, characterized in that: the hoist (11) includes a hoist housing (47) and a transmission belt (44) inside the hoist housing (47), the The belt (44) is wrapped around the squirrel cage roller (40) installed at the upper and lower ends of the hoist housing (47). On the belt (44) there are a number of hoisting buckets (45) that can accommodate materials. On (47) there is a motor (43) and a reducer (42) for driving the operation of the squirrel cage roller (40) and chain (46); on the hoist housing (47), there is also a motor (43) for maintenance, replacement and lifting. Access door (41) for bucket (45) or belt (44). 4. The gear strengthening shot blasting machine according to claim 1, characterized in that: in the suspended conveyor (7), the motor (62), the sprocket and the guide rail are installed on the bracket (61), and there is a Chain (63), hangs rotation mechanism (9) on guide rail, and this rotation mechanism (9) is connected with chain (63) simultaneously, is also installed with heavy hammer type tensioning mechanism on support (61), and this heavy hammer type tensioning mechanism There are interconnected carriage (64) and traction rope (65) in the tightening mechanism, the weight is suspended below the traction rope (65), and the carriage (64) and chain (63) that can slide on the support (61) connect. 5. The gear strengthening shot blasting machine according to claim 1, characterized in that: there is a waste port (18) on the side of the curtain sorter (8), and there is a shot blasting hole in the middle of the curtain sorter (8). The feed bin (17) is provided with a steel shot distribution pipe (19) at the lower part of the shot feed bin (17), and the lower end of the distribution pipe (19) is equipped with a pneumatic shot valve (14) and communicated with the shot blaster (10) . 6. The gear reinforced shot blasting machine according to claim 1, characterized in that: in the shot blaster (10), the inner wall of the shot blaster shell (26) has a lining (37), and the shot blaster shell (26) has a lining (37). 26) There is an impeller (34) installed on the bearing housing (27) by means of a rotating shaft (33) and a bearing (7), a blade (35) is arranged on the impeller (34), and a branch is installed at one end of the rotating shaft (33). Pill wheel (36), motor (30) utilizes belt pulley (31) and belt (29) to be connected with belt pulley (28) that is installed on the rotating shaft (33), at the steel shot outlet of shot blasting machine shell (26) Orientation cover (38) is arranged. 7. The gear strengthening shot blasting machine according to claim 1, characterized in that: the shot blasting chamber (6) includes a main cleaning chamber (68) and two secondary cleaning chambers (67), in the main cleaning chamber (68 ) respectively install two blasting devices (10) corresponding to the workpieces of the two stations, and the blasting device (10) is fixed on the chamber body plate 69 of the shot blasting cleaning chamber (6). There is a sweeping area liner (70) in the shot blasting room (6); a cleaning room door (66) driven by a cylinder is arranged on the shot blasting room (6), and there is a steel plate at the entrance and exit of the cleaning room door (66). Pill connects ball bucket (72), and polyurethane sealing door (71) is housed at shot blasting main cleaning room (68) entrance and exit. 8. The gear strengthening shot blasting machine according to claim 1, characterized in that: in the screw conveyor (5), the motor (20) and its reducer (21) are installed on the bracket, and the reducer (21) Output sprocket utilizes chain (22) to be connected with the sprocket wheel that is installed on screw rod (23) end, and screw rod (23) is installed on the support. 9. The gear strengthening shot blasting machine according to claim 1, characterized in that: in the rotation mechanism (9), the upper end of the boom (50) is fixedly connected to the shaft sleeve (51), and the upper end of the shaft sleeve (51) The sprocket (52) is fixedly connected, and the bearing is used to connect the hanging rod (53) inside the shaft sleeve (51). There is a roller (54) on the upper end of the hanging rod (53), and the roller (54) is used to hang the suspension On the guide rail in (7), the lower end of suspension rod (50) passes through the sealing strip (49) that is arranged on the support (61), connects suspension hook (48) at the lower end of suspension rod (50); 61) motor (58) and reducer (57) are installed on the top, utilize sprocket wheel and chain (56) to be connected with the sprocket wheel (55) that is installed on the support at the output end of reducer (57), connect with sprocket wheel (55 ) another sprocket wheel of the coaxial reuse chain is connected with the sprocket wheel (52) on the hanging bar (53).

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