CN112477477B - Self-cleaning telescopic blackboard device - Google Patents

Abstract

The invention discloses a self-cleaning telescopic blackboard device, comprising a pair of fixing frames and a blackboard cloth, the fixing frames are fixed on a wall, an upper driving roller group, a lower driving roller group and a traction roller are installed between the fixing frames, and the blackboard cloths are respectively In cooperation with the upper drive roller group, the lower drive roller group and the traction roller, a motor is installed in the middle of the fixing frame, and the motor is respectively matched with the telescopic mechanism and the transmission mechanism. There is also a heating plate installed between them. The heating plate can heat the blackboard cloth and the cleaning mechanism respectively. The traction roller cooperates with the transmission mechanism. The sheave is installed on the rotating shaft through a one-way bearing, and the sheave and the traction roller are fixed by the traction rope. Connection, through the rotation of the motor, the traction roller can be lifted by the traction rope. During the lifting of the traction roller, the pulling of the blackboard cloth can drive the upper drive roller group to slide down along the upper chute, which is convenient and comfortable. write.

Description

A self-cleaning telescopic blackboard device

technical field

The invention relates to the field of office teaching tools, in particular to a self-cleaning telescopic blackboard device.

Background technique

The blackboard is a teaching tool that every classroom in every school will be equipped with. The existing blackboards are generally fixed. After the teacher writes with chalk on the blackboard, he needs to erase it before continuing to write. However, in the process of erasing the blackboard The chalk ash on the middle blackboard is diffused near the blackboard, and it is easy to float into the eyes of the person who wipes the blackboard or be inhaled into the nasal cavity, thereby causing various diseases. Different, and then the utilization rate of the blackboard is also different, which results in a waste of blackboard resources.

So to sum up, in order to protect the health of teachers and make full use of teaching resources, there is an urgent need for a blackboard that has an automatic cleaning function and can also be stretched.

SUMMARY OF THE INVENTION

In view of the situation in the background technology, the present invention provides a self-cleaning telescopic blackboard device, which replaces the existing fixed blackboard with a flexible blackboard cloth, and at the same time realizes self-cleaning and telescopic under the action of the telescopic mechanism and the cleaning mechanism, effectively The problems in the background art are solved.

In order to solve the above technical problems, the present invention is solved by the following technical solutions: a self-cleaning telescopic blackboard device, comprising a pair of fixing frames and a blackboard cloth, the fixing frames are fixed on the wall, and the upper part between the fixing frames slides An upper drive roller set is installed, a symmetrical lower drive roller set is installed at the lower part, and traction rollers are also slidably installed between the lower drive roller sets. The blackboard cloth is respectively connected with the upper drive roller set and the lower drive roller. The group cooperates with the traction roller, a motor is installed in the middle of the fixing frame on one side, and the motor is respectively matched with the telescopic mechanism and the transmission mechanism. The lower part of the fixing frame is also installed with a cleaning mechanism, and the cleaning mechanism The transmission mechanism cooperates, and a heating plate is also installed between the fixing frames. The heating plate can respectively heat the blackboard cloth and the cleaning mechanism. The traction roller is also connected to the With the cooperation of the transmission mechanism, the extension and cleaning of the blackboard cloth can be realized respectively through the forward and reverse rotation of the motor.

Preferably, the upper part of the fixing frame is provided with a pair of symmetrical upper chute, the lower part is provided with a lower chute, the upper drive roller set includes a pair of upper drive rollers, and the upper drive rollers are respectively slidably matched with the upper chute , the traction roller is matched with the lower chute, the lower drive roller group includes a pair of lower drive rollers, the lower drive rollers are rotatably matched with the fixing frame, and an upper baffle is installed below the upper drive rollers, A lower baffle is installed above the lower transmission roller, two ends of the upper baffle are matched with both ends of the upper transmission roller, both ends of the lower baffle are matched with both ends of the lower transmission roller, and the lower baffle is matched with both ends of the lower transmission roller. The upper ends of both sides of the plate are also provided with limit grooves, and the upper baffle plate is matched with the limit grooves.

Preferably, a support block is also installed in the upper chute, the support block is matched with the end of the upper transmission roller, and there are positioning grooves on both sides of the support block, and the positioning groove is connected to the upper chute. The side walls are matched, a guide rod is fixed at the bottom of the support block, a return spring is installed on the guide rod, and the guide rod is matched with a guide hole provided at the bottom of the upper chute.

Preferably, the telescopic mechanism includes a rotating shaft and a traction rope, the rotating shaft is connected with the output end of the motor, a sheave is installed on the rotating shaft through a one-way bearing, and the two ends of the traction rope are respectively connected with the sheave and the pulley. The traction rollers are fixedly connected.

Preferably, the transmission mechanism comprises a main bevel gear, a transmission part and a reversing part, the main bevel gear is mounted on the output end of the motor, and both the transmission part and the reversing part are connected to the fixing frame Through the rotational connection of the support frame, the transmission part is matched with the reversing part, and the reversing part is matched with the lower transmission roller on one side.

Preferably, the transmission component includes a transmission shaft and a transmission main gear, the transmission shaft is rotatably matched with the fixing frame, a transmission bevel gear is installed on the upper end of the transmission shaft, and the transmission bevel gear cooperates with the main bevel gear , the lower side wall of the transmission shaft is provided with splines, the transmission main gear is installed on the transmission shaft and is matched with the splines through the spline grooves, the lower part of the transmission shaft is installed with an ejector spring, and the top The outlet spring is matched with the lower end of the main transmission gear, and the upper end of the main transmission gear is also matched with the stopper.

Preferably, the reversing component includes a reversing shaft, the reversing shaft is rotatably connected to the fixing frame, a transmission pinion is installed in the middle of the reversing shaft, and upper cones are respectively installed at the upper and lower ends of the reversing shaft gear and lower bevel gear, the transmission pinion gear is matched with the transmission main gear, the lower bevel gear is matched with the auxiliary bevel gear installed at the end of the lower transmission roller on one side, the upper bevel gear is matched with the cleaning Institutional cooperation.

Preferably, the cleaning mechanism includes a driving bevel gear, a water spraying mechanism and a wiping mechanism, the driving bevel gear is rotatably connected with the fixing frame, the driving bevel gear is matched with the upper bevel gear, and the end of the driving bevel gear is An eccentric pin shaft is also fixed on the part, and the eccentric pin shaft is respectively matched with the water spraying mechanism and the wiping mechanism.

Preferably, the sprinkler mechanism includes a pumping cylinder, a water tank and a water collecting tank, a piston is installed in the pumping cylinder, the piston is matched with the eccentric pin through a piston rod, and the ends of the pumping cylinder are respectively It is communicated with the water inlet pipe and the water outlet pipe. There are one-way valves in the water inlet pipe and the water outlet pipe. The water inlet pipe is communicated with the water tank, and the water outlet pipe is communicated with the sprinkler pipe. Evenly distributed water outlet holes, the two ends of the sprinkler pipe are fixedly connected to the fixing frame, the water outlet holes are close to and face the blackboard cloth, the two ends of the water collecting tank are fixedly connected to the fixing frame, and are located at the Below the sprinkler pipe, a drain pipe is also communicated with the end of the sprinkler pipe.

Preferably, the wiping mechanism includes a wiping roller and a connecting rod group, two ends of the wiping roller are respectively matched with the chute provided on the fixing frame, the wiping roller is in contact with the blackboard cloth, and the wiping The end of the roller also forms a crank-slider mechanism through the connecting rod group and the eccentric pin shaft.

The beneficial effects of the present invention are:

1. Install the sheave on the rotating shaft through the one-way bearing, and connect the sheave with the traction roller through the traction rope. Through the rotation of the motor, the traction roller can be lifted by the traction rope. In the process of lifting the traction roller, By pulling the blackboard cloth, the upper drive roller group can be driven to slide down along the upper chute, so as to write conveniently and comfortably.

2. By installing the transmission mechanism on the side of the fixed plate and the sprinkler mechanism and the wiping mechanism on the lower part of the back of the blackboard cloth, the motor drives the transmission mechanism to rotate, which in turn drives the transmission roller to rotate, and also drives the sprinkler mechanism and the wiping mechanism to start. , spraying, wiping and drying the blackboard cloth at the same time, without manual wiping, and no chalk dust is generated, which effectively ensures the physical and mental health of the user.

Description of drawings

1 and 2 are schematic structural diagrams of the present invention.

FIG. 3 is a cross-sectional view of the present invention as viewed from the right side.

Figure 4 is a right side view of the present invention.

FIG. 5 is a schematic diagram of the structure of the transmission roller group and the baffle group of the present invention.

FIG. 6 is a schematic structural diagram of the telescopic mechanism of the present invention.

Fig. 7 is an enlarged schematic view of part A in Fig. 2 of the present invention.

Fig. 8 is an enlarged schematic view of part B in Fig. 4 of the present invention.

Fig. 9 is an enlarged schematic view of part C in Fig. 5 of the present invention.

FIG. 10 is an enlarged schematic diagram of part D in FIG. 6 of the present invention.

Fig. 11 is an enlarged schematic view of part E in Fig. 7 of the present invention.

In the figure: fixed frame 1, upper chute 101, lower chute 102, water collecting tank 103, drain pipe 104, chute 105, drive bevel gear 106, eccentric pin 107, upper drive roller 201, lower drive roller 202, upper stop Plate 203, lower baffle 204, limit groove 205, support block 206, positioning groove 207, guide rod 208, return spring 209, auxiliary bevel gear 210, motor 301, rotating shaft 302, main bevel gear 303, traction rope 304, traction Roller 305, stop block 306, sheave 307, heating plate 4, transmission shaft 501, transmission bevel gear 502, transmission main gear 503, ejector spring 504, transmission secondary gear 601, upper bevel gear 602, lower bevel gear 603, Liquid cylinder 701 , piston rod 702 , water inlet pipe 703 , water outlet pipe 704 , sprinkler pipe 705 , one-way valve 706 , wiping roller 801 , connecting rod group 802 , blackboard cloth 9 .

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art on the premise that no creative work is required are within the scope of protection of the present invention.

Example As shown in Figures 1 to 11, a self-cleaning telescopic blackboard device includes a pair of fixing frames 1 and a blackboard cloth 9, the fixing frames 1 are fixed on the wall, and the upper part between the fixing frames 1 is slidably installed. A set of upper drive rollers 201, a symmetrical set of lower drive rollers 202 are installed at the lower part, and traction rollers 305 are also slidably installed between the lower drive rollers 202. The lower drive rollers 202 are matched with the traction rollers 305. A motor 301 is installed in the middle of the fixing frame 1 on one side. The motor 301 is respectively matched with the telescopic mechanism and the transmission mechanism. A cleaning mechanism, the cleaning mechanism cooperates with the transmission mechanism, a heating plate 4 is also installed between the fixing frames 1, and the heating plate 4 can respectively heat the blackboard cloth 9 and the cleaning mechanism, so The traction roller 305 also cooperates with the transmission mechanism through a block 306 fixed at the end, and the blackboard cloth 9 can be stretched and cleaned respectively through the forward and reverse rotation of the motor 301 .

The upper part of the fixing frame 1 is provided with a pair of symmetrical upper chute 101, and the lower part is provided with a lower chute 102. The upper drive roller 201 group includes a pair of upper drive rollers 201, and the upper drive rollers 201 are respectively connected with the upper slides. The groove 101 is slidingly matched, the traction roller 305 is matched with the lower groove 102, the lower drive roller 202 group includes a pair of lower drive rollers 202, the lower drive rollers 202 are rotated and matched with the fixing frame 1, the An upper baffle 203 is installed below the upper drive roller 201, and a lower baffle 204 is installed above the lower drive roller 202. Both ends of the upper baffle 203 are matched with both ends of the upper drive roller 201, and the lower baffle Both ends of 204 are matched with both ends of the lower transmission roller 202 , the upper ends of both sides of the lower baffle 204 are further provided with limiting grooves 205 , and the upper baffle 203 is matched with the limiting grooves 205 .

A support block 206 is also installed in the upper chute 101, and the support block 206 is matched with the end of the upper transmission roller 201. There are positioning grooves 207 on both sides of the support block 206, and the positioning groove 207 is connected with the The side walls of the upper chute 101 cooperate with each other, a guide rod 208 is fixed at the bottom of the support block 206 , and a return spring 209 is installed on the guide rod 208 . Pilot hole fit.

The telescopic mechanism includes a rotating shaft 302 and a traction rope 304. The rotating shaft 302 is connected to the output end of the motor 301. A sheave 307 is installed on the rotating shaft 302 through a one-way bearing. The sheave 307 and the traction roller 305 are fixedly connected.

The transmission mechanism includes a main bevel gear 303, a transmission component and a reversing component. The main bevel gear 303 is installed at the output end of the motor 301. Both the transmission component and the reversing component are connected to the fixing frame. 1. Connected through the rotation of the support frame, the transmission part cooperates with the reversing part, and the reversing part cooperates with the lower transmission roller 202 on one side.

The transmission component includes a transmission shaft 501 and a transmission main gear 503. The transmission shaft 501 is rotatably matched with the fixing frame 1. A transmission bevel gear 502 is installed on the upper end of the transmission shaft 501. The main bevel gear 303 is matched, the lower side wall of the transmission shaft 501 is provided with splines, the transmission main gear 503 is installed on the transmission shaft 501 and is matched with the splines through the spline groove, the lower part of the transmission shaft 501 An ejection spring 504 is installed, the ejection spring 504 is matched with the lower end of the transmission main gear 503 , and the upper end of the transmission main gear 503 is also matched with the stopper 306 .

The reversing component includes a reversing shaft, which is rotatably connected to the fixing frame 1 , a transmission pinion 601 is installed in the middle of the reversing shaft, and an upper bevel gear is installed at the upper and lower ends of the reversing shaft respectively. 602 and the lower bevel gear 603, the transmission pinion 601 cooperates with the transmission main gear 503, the lower bevel gear 603 cooperates with the auxiliary bevel gear 210 installed at the end of the lower transmission roller 202 on one side, and the upper The bevel gear 602 cooperates with the cleaning mechanism.

The cleaning mechanism includes a driving bevel gear 106, a water spraying mechanism and a wiping mechanism. The driving bevel gear 106 is rotatably connected with the fixing frame 1, and the driving bevel gear 106 cooperates with the upper bevel gear 602. An eccentric pin shaft 107 is also fixed on the end of the gear 106, and the eccentric pin shaft 107 is respectively matched with the water spraying mechanism and the wiping mechanism.

The sprinkler mechanism includes a pumping cylinder 701, a water tank and a water collecting tank 103. A piston is installed in the pumping cylinder 701. The piston cooperates with the eccentric pin 107 through a piston rod 702. The water inlet pipe 703 and the water outlet pipe 704 are respectively connected with the water inlet pipe 703 and the water outlet pipe 704. There is a one-way valve 706 in the water inlet pipe 703 and the water outlet pipe 704. The water inlet pipe 703 is communicated with the water tank, and the water outlet pipe 704 is connected with the sprinkler pipe. 705 is connected, the side wall of the sprinkler pipe 705 is provided with a number of evenly distributed water outlet holes, the two ends of the sprinkler pipe 705 are fixedly connected with the fixing frame 1, and the water outlet holes are close to and face the blackboard cloth 9, so Both ends of the water collecting tank 103 are fixedly connected to the fixing frame 1 and are located below the sprinkler pipe 705 , and the end of the sprinkler pipe 705 is also connected with a drain pipe 104 .

The wiping mechanism includes a wiping roller 801 and a connecting rod group 802. The two ends of the wiping roller 801 are respectively matched with the chute 105 provided on the fixing frame 1, and the wiping roller 801 is in contact with the blackboard cloth 9. , the end of the wiping roller 801 also forms a crank-slider mechanism through the connecting rod group 802 and the eccentric pin shaft 107 .

Specific working process: when the blackboard device needs to be used, the blackboard device is in the initial state, the upper drive roller 201 is located at the lower end of the upper chute 101, the return spring 209 is in a compressed state, the traction roller 305 is located at the upper end of the lower chute 102, The transmission main gear 503 is disengaged from the transmission pinion 601 under the action of the ejection spring 504, that is, the blackboard device is in a retracted state at this time, which is convenient for the user to write. When writing to the bottom of the blackboard cloth 9, the motor 301 rotates forward , and then drive the upper sheave 307 of the rotating shaft 302 to rotate. At this time, the traction rope 304 wound in the sheave 307 is released, that is, the traction roller 305 slides down along the lower groove 102, and the upper drive roller 201 is under the elastic force of the return spring 209. Slide up along the upper chute 101, and then drive the content written on the front of the blackboard cloth 9 to move up, and then the user can continue to write on the new blank space below the front of the blackboard cloth 9, and the drive shaft 501 is idling during the entire writing process. state, when the front of the blackboard cloth 9 is in the maximum expansion state, the motor 301 stops rotating forward, the traction roller 305 is located at the lower end of the lower chute 102, the upper transmission roller 201 is located at the upper end of the upper chute 101, and the end of the traction roller 305 is at this time. The fixed block 306 pushes down the main transmission gear 503 along the transmission shaft 501 to engage with the transmission secondary gear 601 .

When the content written on the front of the blackboard cloth 9 needs to be wiped, only the motor 301 needs to be reversed. Since the sheave 307 on the rotating shaft 302 cooperates with the rotating shaft 302 through a one-way bearing, the sheave 307 cannot drive the traction roller 305 to move up at this time. At this time, the transmission shaft 501 drives the transmission pinion gear 601 to rotate through the transmission main gear 503, which in turn drives the lower bevel gear 603 to mesh with the auxiliary bevel gear 210 on the lower transmission roller 202, thereby driving the lower transmission roller 202 to rotate, so that the blackboard cloth 9 is rotated. Change the face, change the clean back to the front, and change the written front to the back. During the face changing process, the upper bevel gear 602 drives the driving bevel gear 106 to rotate, and the driving bevel gear 106 drives the watering through the eccentric pin 107. The mechanism and the wiping mechanism work at the same time, and the sprinkler mechanism pumps the water in the water tank into the sprinkler pipe 705 under the action of the liquid pumping cylinder 701 and the one-way valve 706 in the water inlet pipe 703 and the water outlet pipe 704 and sprays it to the blackboard cloth 9 through the water outlet hole. Wet the written chalk words on the top, and then continuously reciprocate the wetted blackboard cloth 9 by the wiping roller 801 on the wiping mechanism, and the wiped blackboard cloth 9 is then dried by the heating plate 4, and the heating plate 4 simultaneously The wiping roller 801 is also dried, and the sewage after wiping on the blackboard cloth 9 can flow into the water collecting tank 103 and be discharged through the drain pipe 104 .

After the face change is completed, the motor 301 continues to rotate forward. At this time, the traction roller 305 is pulled up and moved up under the action of the traction rope 304, thereby disengaging the transmission main gear 503 and the transmission pinion gear 601, and finally shrinking the blackboard device again to Minimal state, convenient for users to use.

Claims (1)

1. A self-cleaning telescopic blackboard device, comprising a pair of fixing frames (1) and a blackboard cloth (9), the fixing frames (1) are fixed on a wall, and it is characterized in that: between the fixing frames (1) An upper drive roller set is slidably installed on the upper part, a symmetrical lower drive roller set is installed on the lower part, and traction rollers (305) are also slidably installed between the lower drive roller sets, and the blackboard cloth (9) is respectively connected with the upper drive roller set. The roller group, the lower transmission roller group and the traction roller (305) are matched, and a motor (301) is installed in the middle of the fixing frame (1) on one side, and the motor (301) is respectively connected with the telescopic mechanism and the transmission mechanism In cooperation, a cleaning mechanism is also installed at the lower part of the fixing frame (1), the cleaning mechanism cooperates with the transmission mechanism, and the traction roller (305) is also connected to the transmission mechanism through a stopper (306) fixed at the end In cooperation, a heating plate (4) is also installed between the fixing frames (1), and the heating plate can heat the blackboard cloth (9) and the cleaning mechanism respectively, The forward and reverse rotations can respectively realize the stretching and cleaning of the blackboard cloth (9); The transmission mechanism comprises a main bevel gear (303), a transmission part and a reversing part, the main bevel gear (303) is installed on the output end of the motor (301), the transmission part and the reversing part Both are connected with the fixing frame (1) through the support frame, the transmission part is matched with the reversing part, and the reversing part is matched with the lower transmission roller (202) on one side; The transmission component includes a transmission shaft (501) and a transmission main gear (503), the transmission shaft (501) is rotatably matched with the fixing frame (1), and a transmission bevel gear (501) is mounted on the upper end of the transmission shaft (501). 502), the transmission bevel gear (502) cooperates with the main bevel gear (303), the lower side wall of the transmission shaft (501) is provided with a spline, and the transmission main gear (503) is installed on the transmission shaft (503). The shaft (501) is matched with the splines through a spline groove, an ejection spring (504) is installed on the lower part of the transmission shaft (501), and the ejection spring (504) is connected with the transmission main gear (503) The lower end is matched, and the upper end of the transmission main gear (503) is also matched with the stopper (306); The reversing component includes a reversing shaft, the reversing shaft is rotatably connected with the fixing frame (1), a transmission pinion (601) is installed in the middle of the reversing shaft, and the upper and lower ends of the reversing shaft are respectively installed There are an upper bevel gear (602) and a lower bevel gear (603), the transmission pinion (601) is matched with the transmission main gear (503), and the lower bevel gear (603) is connected with the lower transmission roller on one side (202) The auxiliary bevel gear (210) installed at the end is matched, and the upper bevel gear (602) is matched with the cleaning mechanism; The cleaning mechanism includes a driving bevel gear (106), a watering mechanism and a wiping mechanism, the driving bevel gear (106) is rotatably connected with the fixing frame (1), and the driving bevel gear (106) is connected with the upper bevel The gear (602) is matched, and an eccentric pin (107) is also fixed on the end of the drive bevel gear (106), and the eccentric pin (107) is respectively matched with the sprinkler mechanism and the wiping mechanism; The sprinkler mechanism includes a liquid pumping cylinder (701), a water tank and a water collecting tank (103). A piston is installed in the liquid pumping cylinder (701), and the piston is connected to the eccentric pin shaft (107) through a piston rod (702). ), the end of the liquid pumping cylinder (701) is also communicated with the water inlet pipe (703) and the water outlet pipe (704) respectively, and both the water inlet pipe (703) and the water outlet pipe (704) are provided with a one-way Valve (706), the water inlet pipe (703) is communicated with the water tank, the water outlet pipe (704) is communicated with the sprinkler pipe (705), and the side wall of the sprinkler pipe (705) is provided with a number of evenly distributed water outlet holes, so Both ends of the sprinkler pipe (705) are fixedly connected to the fixing frame (1), the water outlet is close to and faces the blackboard cloth (9), and both ends of the water collecting tank (103) are connected to the fixing frame (1). 1) It is fixedly connected and located below the sprinkler pipe (705), and the end of the sprinkler pipe (705) is also connected with a drain pipe (104); The wiping mechanism includes a wiping roller (801) and a connecting rod group (802). Both ends of the wiping roller (801) are respectively matched with the chute (105) provided on the fixing frame (1). The roller (801) is in contact with the blackboard cloth (9), and the end of the wiping roller (801) also forms a crank-slider mechanism through the connecting rod group (802) and the eccentric pin shaft (107); The upper part of the fixing frame (1) is provided with a pair of symmetrical upper chute (101), and the lower part is provided with a lower chute (102). (201) are respectively slidably matched with the upper chute (101), the traction roller (305) is matched with the lower chute (102), and the lower drive roller set includes a pair of lower drive rollers (202), so The lower transmission roller (202) is rotatably matched with the fixing frame (1), an upper baffle plate (203) is installed below the upper transmission roller (201), and a lower baffle plate is installed above the lower transmission roller (202). (204), both ends of the upper baffle (203) are matched with both ends of the upper drive roller (201), and both ends of the lower baffle (204) are matched with both ends of the lower drive roller (202), Limiting grooves (205) are further provided on the upper ends of both sides of the lower baffle plate (204), and the upper baffle plate (203) is matched with the limiting grooves (205); A support block (206) is also installed in the upper chute (101), the support block (206) is matched with the end of the upper transmission roller (201), and two sides of the support block (206) are provided with positioning A groove (207), the positioning groove (207) is matched with the side wall of the upper chute (101), a guide rod (208) is fixed at the bottom of the support block (206), and the guide rod (208) is installed on the There is a return spring (209), and the guide rod (208) is matched with the guide hole provided at the bottom of the upper chute (101); The telescopic mechanism includes a rotating shaft (302) and a traction rope (304), the rotating shaft (302) is connected with the output end of the motor (301), and a sheave (307) is installed on the rotating shaft (302) through a one-way bearing ), the two ends of the traction rope (304) are respectively fixedly connected to the sheave (307) and the traction roller (305).

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