A water conservancy project early warning monitoring equipment

Abstract

The invention relates to the technical field of water conservancy projects, and discloses a water conservancy project early warning monitoring device, comprising a cylindrical shell, wherein a monitoring unit is arranged in the cylindrical shell, and the monitoring unit comprises a measuring component arranged inside the cylindrical shell and an early warning component outside the cylindrical shell; the measuring component comprises a mounting cylinder arranged at the lower end of the cylindrical shell, a rubber ring 1 arranged in the mounting cylinder, a sliding groove provided on the inner wall of the cylindrical shell, a floating plate slidably arranged in the sliding groove, a rubber ring 2 arranged at the lower end of the floating plate, and a connecting plate arranged at the upper end of the floating plate; by arranging the measuring component, when the river water rises, the floating plate will rise synchronously with the cylindrical shell, and the rising height of the floating plate is equal to the rising height of the river water, and the staff can quickly obtain the rising height of the river water by reading the measuring ruler, and when the river water rises to the warning water level, the ringing ball in the early warning component will ring when hit by the water wheel, so as to remind the staff.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy projects, and in particular to a water conservancy project early warning monitoring device. Background Art

[0002] The early warning monitoring equipment for water conservancy projects is a key equipment designed to monitor and manage the operation status of water conservancy projects, prevent disasters, and ensure the safety of water resources. The early warning monitoring equipment usually monitors the water quality, water level, water flow speed and other aspects of the monitored river in real time. Among them, water level monitoring requires the use of water level monitoring devices. Water level monitoring is one of the most important monitoring in water conservancy projects. Water level monitoring devices are installed in rivers, reservoirs or waterways. Sensor monitoring or simplified monitoring methods of visual observation are usually used to measure water level changes in real time. Water level monitoring equipment can help engineering personnel monitor floods and water level anomalies in real time, and take timely measures to protect the safety of surrounding areas and facilities. The simplified monitoring method of visual observation is usually to set up a water level early warning monitoring device at an artificial observation site, set a normal water level value for the target river, and then the staff regularly records and measures and records the water level situation, and submits it to the monitoring center regularly to complete the regular monitoring of the target river, while sensor monitoring transmits the monitoring data to the background through sensors to achieve remote monitoring.

[0003] In the prior art, engineering personnel can use sensor water level monitoring or simplified visual observation monitoring to monitor the target river water level in real time, but the following problems still exist: if sensor monitoring equipment is used, due to the turbulent flow of some rivers, it is easy to collide with floating objects on the surface of the river, causing equipment damage and failure to affect the monitoring effect; at the same time, the equipment is easily corroded or damaged after being immersed in the river for a long time, resulting in increased maintenance costs; if manual visual observation is used for monitoring, the detection personnel cannot guarantee that the river water level is detected at all times. Therefore, when the river water level is at the warning water level, the staff cannot discover it in time and take protective measures in time. Therefore, it is necessary to design a water conservancy project early warning monitoring equipment to monitor the river water level in real time without using sensors. When the river water level rises to the warning water level, a bell will sound to remind nearby staff to improve the monitoring effect. Summary of the invention

[0004] In view of the problems in the existing technology that the sensor monitoring maintenance cost is high and the equipment is easily damaged, and the manual monitoring is not focused and cannot timely detect the river water level rising to the warning water level, a water conservancy project early warning monitoring equipment is proposed.

[0005] The present application provides a water conservancy project early warning monitoring device, the purpose of which is: by setting a measuring component, when the river water rises, the floating plate will rise synchronously with the cylindrical shell, and the rising height of the floating plate is equal to the rising height of the river water. The staff can quickly obtain the rising height of the river water by reading the measuring ruler. At the same time, when the river water rises to the warning water level, the bell ball in the early warning component will ring when it is hit by the water wheel, reminding the staff, thereby effectively preventing the staff from being unable to timely discover that the water level has risen to the warning line due to negligence.

[0006] The technical solution of the present invention is: a water conservancy project early warning monitoring device, comprising a cylindrical shell, wherein a monitoring unit is arranged inside the cylindrical shell, wherein the monitoring unit comprises a measuring component arranged inside the cylindrical shell and an early warning component outside the cylindrical shell;

[0007] The measuring component includes a mounting tube arranged at the lower end of the cylindrical shell, a rubber ring 1 arranged in the mounting tube, a sliding groove provided on the inner wall of the cylindrical shell, a floating plate slidably arranged in the sliding groove, a rubber ring 2 arranged at the lower end of the floating plate, a connecting plate arranged at the upper end of the floating plate, a wire-releasing groove provided in the mounting tube, a plurality of square plates arranged on the mounting tube, a wire-releasing roller arranged between two corresponding square plates, a long rope provided on the plurality of wire-releasing rollers, and an anchor plate provided at the lower end of the plurality of long ropes;

[0008] A plurality of connecting holes for passing water are provided on the lower side wall of the cylindrical shell, the end face of the sliding groove is the same shape and size as the floating plate, a protective plate is fixedly installed on the outer surface of the rubber ring, a plurality of the square plates are fixedly installed above the mounting tube and located inside the cylindrical shell, one end of a plurality of the long ropes are fixedly connected to the anchor plate through the wire-releasing groove, and the anchor plate is located below the outside of the cylindrical shell, and a reading component is installed between the mounting tube and the connecting plate.

[0009] Furthermore, the reading assembly includes a support block arranged on the outer wall of the mounting tube, a reading scale arranged on the support block, a square hole is opened on the connecting plate, and the reading scale slides in the square hole.

[0010] Furthermore, the warning component includes two support rods arranged at the lower end of the connecting plate, two seat plates arranged at the lower ends of the two support rods, two water wheels arranged on the two seat plates, two matching plates arranged on the two seat plates, a hanging rope arranged at the lower end of the connecting plate, a bell ball arranged at the lower end of the hanging rope, a short rope arranged between the bell ball and the matching plate, and a trigger assembly is installed between the cylindrical shell and the connecting plate.

[0011] Furthermore, the trigger assembly includes two support plates arranged on both sides of the outer wall of the cylindrical shell, two suspension rods arranged on the two support plates, two tension rods arranged at the lower end of the connecting plate, a pull rope arranged at the lower end of the suspension rod, and through holes opened at the lower ends of the two tension rods. The pull rope slides through the connecting plate and is fixedly connected to the bell ball through the through holes. The suspension rod is arranged in an L shape. Two sliding holes are opened on the connecting plate. The suspension rod slides through the corresponding sliding holes.

[0012] Furthermore, the cylindrical shell, the floating plate and the connecting plate are all made of aluminum alloy.

[0013] Furthermore, the two seat plates and the second rubber ring are on the same horizontal plane.

[0014] Furthermore, the anchor plate is made of lead, the plurality of long ropes are steel ropes, and the short ropes are elastic ropes.

[0015] Furthermore, the bell ball consists of a ball shell and a steel ball, the ball shell is fixedly connected to the hanging rope, and the steel ball is placed in the ball shell.

[0016] Beneficial effects of the present invention:

[0017] 1. By setting up measuring components, when the river water level rises, the floating plate will rise synchronously with the cylindrical shell and the river water. When the floating plate rises, it will also drive the connecting plate to rise synchronously. The staff can record and report the rising height of the river by reading the value on the reading scale.

[0018] 2. By setting up early warning components, when the river rises to the early warning water level, the pulling force of the pull rope on the bell ball is reduced, so that the bell ball is within the rotation range of the water wheel. Because the water wheel is always on the surface of the river, the water wheel keeps rotating under the action of the water flow. The continuously rotating water wheel collides with the bell ball and rings the bell to remind the staff, effectively preventing the situation where the staff fails to discover that the water level has risen to the warning line in time due to negligence. At the same time, the faster the river rises, the faster the river flow speed is, and the faster the frequency of the bell is. Therefore, the staff can judge how fast the river water level rises by the frequency of the bell.

[0019] 3. By setting up a cylindrical shell made of aluminum alloy material, the measuring components inside can be effectively protected so that the measuring components will not be damaged by the impact of floating objects on the river surface, thereby increasing the service life of the equipment and reducing the number of maintenance times. The equipment has a low manufacturing cost and is suitable for wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure from a first viewing angle of the present invention;

[0021] Figure 2It is a partial cross-sectional structural stereogram of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the measuring component of the present invention;

[0023] Figure 4 For the present invention Figure 1 Schematic diagram of the plane structure;

[0024] Figure 5 It is a schematic diagram of the internal structure of the cylindrical shell of the present invention;

[0025] Figure 6 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0026] Figure 7 For the present invention Figure 4 The enlarged schematic diagram of point B in the middle;

[0027] Figure 8 It is a schematic diagram of the anchor plate installation structure of the present invention.

[0028] In the figure:

[0029] 1. Cylindrical shell; 2. Mounting cylinder; 3. Rubber ring one; 4. Sliding groove; 5. Floating plate; 6. Rubber ring two; 7. Connecting plate; 8. Pay-off groove; 9. Square plate; 10. Pay-off roller; 11. Long rope; 12. Anchor plate; 13. Connecting hole; 14. Support block; 15. Reading scale; 16. Square hole; 17. Support rod; 18. Seat plate; 19. Water wheel; 20. Matching plate; 21. Lifting rope; 22. Bell ball; 23. Short rope; 24. Support plate; 25. Lifting rod; 26. Tension rod; 27. Pull rope; 28. Lead-in hole; 29. ​​Sliding hole. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] Example 1, reference Figure 1-Figure 5, which is the first embodiment of the present invention, provides a water conservancy project early warning monitoring device, including a cylindrical shell 1, a monitoring unit installed in the cylindrical shell 1, the monitoring unit includes a measuring component installed inside the cylindrical shell 1 and an early warning component on the outside; the measuring component includes a mounting tube 2 threadedly installed at the lower end of the cylindrical shell 1, a rubber ring 3 fixedly installed in the mounting tube 2, a sliding groove 4 provided on the inner wall of the cylindrical shell 1, a floating plate 5 slidably installed in the sliding groove 4, a rubber ring 6 fixedly installed at the lower end of the floating plate 5, a connecting plate 7 fixedly installed at the upper end of the floating plate 5, a wire release groove 8 provided in the mounting tube 2, a plurality of square plates 9 fixedly installed on the mounting tube 2, and a rotating mounting plate. A pay-off roller 10 is installed between two corresponding square plates 9, a long rope 11 is fixedly installed on the multiple pay-off rollers 10, and an anchor plate 12 is fixedly installed at the lower end of the multiple long ropes 11; a plurality of connecting holes 13 for water flow are opened on the lower side wall of the cylindrical shell 1, the end face of the sliding groove 4 is the same shape and size as the floating plate 5, and a protective plate (not shown in the figure) is fixedly installed on the outer surface of the rubber ring 3, and multiple square plates 9 are fixedly installed above the mounting tube 2 and located inside the cylindrical shell 1, one end of the multiple long ropes 11 passes through the pay-off groove 8 and is fixedly connected to the anchor plate 12, and the anchor plate 12 is located below the outside of the cylindrical shell 1, and a reading component is installed between the mounting tube 2 and the connecting plate 7.

[0032] Reference Figure 2 The reading assembly includes a support block 14 fixedly mounted on the outer wall of the mounting tube 2, a reading scale 15 fixedly mounted on the support block 14, a square hole 16 is opened on the connecting plate 7, and the reading scale 15 slides in the square hole 16. The cylindrical shell 1, the floating plate 5 and the connecting plate 7 are all made of aluminum alloy, the anchor plate 12 is made of lead, the multiple long ropes 11 are all steel ropes, and the short ropes 23 are elastic ropes.

[0033] Specifically, the mounting tube 2 is detachably mounted on the cylindrical shell 1, a threaded groove is provided on the upper outer wall of the mounting tube 2, and a threaded ring matching the threaded groove is integrally formed on the cylindrical shell 1. The mounting tube 2 is mounted on the lower end of the cylindrical shell 1 through the mutual cooperation between the threaded groove and the threaded ring. The purpose is that the staff can remove the mounting tube 2 and select a long rope 11 of appropriate length. When the staff monitors the water level of the target river, a normal water level will be set for the target river. When the staff needs to detect the target area, a long rope 11 with the same length as the normal water level of the target river will be selected, and then the mounting tube 2 will be installed on the cylindrical shell 1. At this time, the equipment is put into the water, and the anchor plate 12 is opened with the lower end of the long rope 11 sinking. When the anchor plate 12 sinks to the bottom, the cylindrical shell 1 floats on the water surface under the action of the rubber ring 3. When the river water begins to rise When the anchor plate 12 limits the cylindrical shell 1, the cylindrical shell 1 is always at the normal water level, and the rising river water enters the cylindrical shell 1 through the connecting hole 13, so that the floating plate 5 floats upward along the sliding groove 4 under the action of the rubber ring 6, and drives the connecting plate 7 to move upward synchronously. At this time, the height of the connecting plate 7 relative to the cylindrical shell 1 is the height of the rising river water. The anchor plate 12 can keep the cylindrical shell 1 at the normal water level and effectively prevent the equipment from tipping over, thereby improving the stability of the equipment during monitoring. Because the river surface water is always in a flowing state, when using the equipment, the staff needs to set up round piles (not shown in the figure) and connecting ropes (not shown in the figure) on the river bank. One end of the connecting rope is fixedly connected to the round pile, and the other end is fixedly connected to the cylindrical shell 1 to prevent the equipment from drifting away.

[0034] The function of the reading component is to facilitate the staff to quickly read the height of the river rise. When the floating plate 5 drives the connecting plate 7 to move upward, the connecting plate 7 moves upward relative to the reading scale 15, and the staff can quickly obtain the height of the river water level rise by reading the scale on the reading scale 15, and record and report it to the monitoring department. The cylindrical shell 1, the floating plate 5 and the connecting plate 7 are made of lightweight aluminum alloy, so that they can float better on the water surface. The anchor plate 12 is made of heavier lead, which is convenient for it to sink to the bottom better and improve the overall stability of the equipment. The floating plate 5 is arranged on the outside of the cylindrical shell 1, which can better protect the floating plate 5 and the rubber ring 6 from being affected by floating objects on the river surface. At the same time, the protective plate can protect the rubber ring 3 and improve the service life of the device. Under normal conditions, the scale at the same horizontal plane height of the reading scale 15 and the surface of the connecting plate 7 is the zero scale line.

[0035] During use, when the water level of the target river is at a normal level, the staff will remove the installation tube 2 from the cylindrical shell 1 and replace the long rope 11 with the same length as the normal water level, and then install the installation tube 2 at the lower end of the cylindrical shell 1, and place the equipment in the river. The cylindrical shell 1 floats on the surface of the river under the action of the rubber ring 3, and the anchor plate 12 sinks to the bottom. At this time, the long rope 11 is in a straightened state. When the water level of the river rises, the anchor plate 12 generates a pulling force on the cylindrical shell 1 through the long rope 11, so that the cylindrical shell 1 will not rise with the rising of the river water. At the same time, the rising river water flows into the cylindrical shell 1. At this time, the floating plate 5 rises synchronously with the river water under the action of the rubber ring 6, and drives the connecting plate 7 to rise synchronously. The connecting plate 7 moves upward relative to the reading scale 15. When the staff needs to record the rising height of the river water level, they directly read the scale of the connecting plate 7 at the reading scale 15 to obtain the rising height of the river water level.

[0036] Example 2, reference Figure 4-Figure 8 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the early warning component includes two support rods 17 fixedly installed at the lower end of the connecting plate 7, two seat plates 18 fixedly installed at the lower ends of the two support rods 17, two water wheels 19 rotatably installed on the two seat plates 18, two matching plates 20 fixedly installed on the two seat plates 18, a hanging rope 21 fixedly installed at the lower end of the connecting plate 7, a bell ball 22 fixedly installed at the lower end of the hanging rope 21, a short rope 23 fixedly installed between the bell ball 22 and the matching plate 20, and a trigger assembly is installed between the cylindrical shell 1 and the connecting plate 7. The trigger assembly includes two support plates 24 fixedly mounted on both sides of the outer wall of the cylindrical shell 1, two suspension rods 25 fixedly mounted on the two support plates 24, two tension rods 26 fixedly mounted on the lower end of the connecting plate 7, a pull rope 27 fixedly mounted on the lower end of the suspension rod 25, and a through hole 28 provided at the lower end of the two tension rods 26. The pull rope 27 slides through the connecting plate 7 and passes through the through hole 28 to be fixedly connected with the ringing ball 22. The suspension rod 25 is set in an L shape. Two sliding holes 29 are provided on the connecting plate 7. The suspension rod 25 slides through the corresponding sliding holes 29. The two seat plates 18 are on the same horizontal plane as the rubber ring 26. The ringing ball 22 is composed of a ball shell (not shown in the figure) and a steel ball (not shown in the figure). The ball shell is fixedly connected to the suspension rope 21, and the steel ball is placed in the ball shell.

[0037] Specifically, the seat plate 18 is always in the same horizontal plane with the rubber ring 26, and the seat plate 18 also rises synchronously with the connecting plate 7 as the river water level rises. Therefore, the seat plate 18 is always on the river water surface, and the water wheel 19 is also on the river water surface at the same time. When the river flows, the flowing water will drive the water wheel 19 to rotate. The faster the river water level rises, the faster the river water flows, and the faster the water wheel 19 rotates. The function of the early warning component is that when the river water level rises to the early warning water level (that is, when the connecting plate 7 rises to the maximum distance), the connecting plate 7 and the suspension rod 25 The distance between them is the smallest at this time, and the pulling force of the pull rope 27 on the bell ball 22 is the smallest. At this time, the bell ball 22 is within the rotation range of the water wheel 19. Therefore, when the water wheel 19 rotates, it will continuously hit the bell ball 22. After the bell ball 22 is hit, the steel ball will continuously move and collide in the ball shell, producing a bell to remind the staff. At the same time, the faster the water level rises, the faster the frequency of the bell will be. The staff can judge the speed of the river water level rising by the frequency of the bell. At the same time, when the river water level drops to a normal height, the pull rope 27 pulls up the bell ball 22 again, and the bell will no longer be heard.

[0038] During use, when the river water level rises to the maximum height (i.e., the warning height), as the floating plate 5 and the connecting plate 7 rise, the distance between the connecting plate 7 and the suspension rod 25 is the smallest, and the pulling force of the pull rope 27 on the bell ball 22 is the smallest. At this time, the bell ball 22 is within the rotation range of the water wheel 19. When the river water flow drives the water wheel 19 to rotate, it will hit the bell ball 22. After the bell ball 22 is hit, the steel ball inside it continues to move in the ball shell and hits to produce a bell, thereby reminding the staff to prevent the staff from neglecting to notice that the river water level is at the warning height due to negligence. When the river water level drops to the normal height, the distance between the connecting plate 7 and the suspension rod 25 becomes larger. At this time, the pull rope 27 pulls up the bell ball 22 again and out of the rotation range of the water wheel 19, and no bell will be produced.

[0039] The remaining structures are the same as those of Example 1.

[0040] Based on Examples 1-2, the working principle of the present invention is as follows: when the target river water level is at a normal water level, the staff removes the installation tube 2 from the cylindrical shell 1 and replaces the long rope 11 with the same length as the normal water level, and then installs the installation tube 2 at the lower end of the cylindrical shell 1, and places the device in the river. The cylindrical shell 1 floats on the surface of the river under the action of the rubber ring 3, and the anchor plate 12 sinks to the bottom. At this time, the long rope 11 is in a straightened state. When the river water level rises, the anchor plate 12 generates a pulling force on the cylindrical shell 1 through the long rope 11, so that the cylindrical shell 1 will not rise with the rising of the river water. At the same time, the rising river water flows into the cylindrical shell 1. At this time, the floating plate 5 rises synchronously with the river water under the action of the rubber ring 6, and drives the connecting plate 7 to rise synchronously. The connecting plate 7 moves upward relative to the reading scale 15. When the staff needs to record the rising height of the river water level, they directly read the scale of the connecting plate 7 at the reading scale 15 to obtain the rising height of the river water level.

[0041] When the river water level rises to the maximum height (i.e. the warning height), with the rise of the floating plate 5 and the connecting plate 7, the distance between the connecting plate 7 and the suspension rod 25 is the smallest, and the pulling force of the pull rope 27 on the bell ball 22 is the smallest. At this time, the bell ball 22 is within the rotation range of the water wheel 19. When the river water flow drives the water wheel 19 to rotate, it will hit the bell ball 22. After the bell ball 22 is hit, the steel ball inside it continues to move in the ball shell and hits to produce a bell, which reminds the staff to prevent the staff from neglecting to notice that the river water level is at the warning height due to negligence. When the river water level drops to the normal height, the distance between the connecting plate 7 and the suspension rod 25 becomes larger. At this time, the pull rope 27 pulls up the bell ball 22 again and out of the rotation range of the water wheel 19, and no bell will be produced.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A water conservancy project early warning monitoring device, comprising a cylindrical shell, characterized in that: A monitoring unit is arranged inside the cylindrical shell, and the monitoring unit comprises a measuring component arranged inside the cylindrical shell and an early warning component arranged outside the cylindrical shell; The measuring component includes a mounting tube arranged at the lower end of the cylindrical shell, a rubber ring 1 arranged in the mounting tube, a sliding groove provided on the inner wall of the cylindrical shell, a floating plate slidably arranged in the sliding groove, a rubber ring 2 arranged at the lower end of the floating plate, a connecting plate arranged at the upper end of the floating plate, a wire-releasing groove provided in the mounting tube, a plurality of square plates arranged on the mounting tube, a wire-releasing roller arranged between two corresponding square plates, a long rope provided on the plurality of wire-releasing rollers, and an anchor plate provided at the lower end of the plurality of long ropes; The warning component includes two support rods arranged at the lower end of the connecting plate, two base plates arranged at the lower ends of the two support rods, two water wheels arranged on the two base plates, two matching plates arranged on the two base plates, a hanging rope arranged at the lower end of the connecting plate, a bell ball arranged at the lower end of the hanging rope, and a short rope arranged between the bell ball and the matching plate. A trigger assembly is installed between the cylindrical shell and the connecting plate. A plurality of communication holes for passing water are provided on the lower side wall of the cylindrical shell; The trigger assembly includes two support plates arranged on both sides of the outer wall of the cylindrical shell, two suspension rods arranged on the two support plates, two tension rods arranged at the lower end of the connecting plate, a pull rope arranged at the lower end of the suspension rod, and through holes opened at the lower ends of the two tension rods. The pull rope slides through the connecting plate and is fixedly connected to the bell ball through the through holes. The suspension rod is arranged in an L shape. Two sliding holes are opened on the connecting plate. The suspension rod slides through the corresponding sliding holes.

2. A water conservancy project early warning monitoring device according to claim 1, characterized in that: The end face of the sliding groove is the same shape and size as the floating plate, a protective plate is fixedly installed on the outer surface of the rubber ring, multiple square plates are fixedly installed above the mounting tube and located inside the cylindrical shell, one end of multiple long ropes pass through the wire-releasing groove and are fixedly connected to the anchor plate, and the anchor plate is located below the outside of the cylindrical shell, and a reading component is installed between the mounting tube and the connecting plate.

3. A water conservancy project early warning monitoring device according to claim 2, characterized in that: The reading component comprises a support block arranged on the outer wall of the mounting tube, a reading ruler arranged on the support block, a square hole is opened on the connecting plate, and the reading ruler slides in the square hole.

4. The water conservancy project early warning monitoring device according to claim 1 is characterized in that: The cylindrical shell, the floating plate and the connecting plate are all made of aluminum alloy.

5. The water conservancy project early warning monitoring device according to claim 3 is characterized by: The two seat plates and the second rubber ring are on the same horizontal plane.

6. The water conservancy project early warning monitoring device according to claim 3 is characterized by: The anchor plate is made of lead, the plurality of long ropes are steel ropes, and the short ropes are elastic ropes.

7. The water conservancy project early warning monitoring device according to claim 1 is characterized by: The ringing ball consists of a ball shell and a steel ball. The ball shell is fixedly connected to a hanging rope, and the steel ball is placed in the ball shell.

Images