Livestock breeding manure treatment and recovery device

Abstract

The invention relates to a livestock breeding manure treatment and recovery device which comprises a material conveying box, a filter box and a drying box, a conveying mechanism is arranged in the material conveying box, a filter screen is fixedly arranged at the joint of the bottom of the material conveying box and the filter box, a feeding pipe communicated with the drying box is arranged at the bottom of the material conveying box, and a rotating column is rotationally connected into the drying box; transverse rods are rotationally connected to the two sides of the rotating column, a plurality of turning plates are evenly and fixedly arranged on the side walls of the transverse rods, heating pieces are fixedly arranged on the turning plates, a first driving mechanism used for rotating the rotating column is arranged at the top of the drying box, and a second driving mechanism used for rotating the transverse rods is arranged in the rotating column; and the conveying mechanism is linked with the first driving mechanism and the second driving mechanism. When a rotating column drives a transverse rod to rotate forwards and backwards continuously and horizontally, the transverse rod rotates forwards and backwards continuously and drives a turning plate to turn up and down, excrement is fully stirred and turned over while being heated and dried, the heating uniformity of the excrement during drying is improved, and then the drying efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of manure treatment, and in particular to a livestock breeding manure treatment and recovery device. Background Art

[0002] Animal husbandry refers to the process of utilizing the physiological functions of domesticated animals such as livestock and poultry, or certain wild animals, through artificial breeding and reproduction, to transform plant energy such as forage and feed into animal energy in order to obtain meat, eggs, milk, and other livestock products.

[0003] In the process of animal husbandry, a large amount of manure is inevitably produced. The manure produced by animals contains a large amount of nutrients generated by plants and energy that can be used. If it is discharged directly without treatment, it will not only pollute the environment, but also cause waste of resources. Therefore, the recycling and treatment of manure is particularly important.

[0004] When recycling manure, the moisture in the manure is generally filtered out, the filtered manure is dried, processed into powdered organic fertilizer, and returned to the field for use on the spot, thereby improving soil fertility and promoting crop growth. When drying manure, the existing manure treatment and recovery device improves the uniformity of heating by continuously turning the manure, but the manure can only be stirred in the horizontal direction by a stirring rod, and cannot be turned in the upper and lower directions at the same time, which easily causes uneven heating of the manure. Based on this, a livestock breeding manure treatment and recovery device is proposed. Summary of the invention

[0005] The present invention provides a livestock manure treatment and recovery device, which is used to solve the problem that the existing manure treatment and recovery device mentioned in the above technical background improves the uniformity of heating by continuously turning the manure when drying the manure, but the manure can only be stirred in the horizontal direction by a stirring rod, and cannot be turned in the vertical direction at the same time, which easily causes uneven heating of the manure in some parts.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a livestock breeding manure treatment and recovery device, comprising a feed box, a filter box and a drying box, the feed box is fixedly arranged above the filter box and the drying box, a conveying mechanism is arranged in the feed box, a filter screen is fixedly arranged at the connection between the bottom of the feed box and the filter box, a feed pipe connected to the drying box is fixedly arranged on one side of the bottom of the feed box, a rotating column is rotatably connected to the bottom of the drying box, cross bars are rotatably connected to the two sides of the rotating column, a number of flip plates are evenly fixedly arranged on the side walls of the cross bar, a heating plate is fixedly arranged on the flip plate, a first driving mechanism for rotating the rotating column is arranged on the top of the drying box, a second driving mechanism for rotating the cross bar is arranged in the rotating column, and the conveying mechanism is linked with the first driving mechanism and the second driving mechanism.

[0007] Preferably, the conveying mechanism includes a conveying shaft rotatably connected to the conveying box, one end of the conveying shaft passes through the conveying box and is fixedly connected to a driving motor, and a spiral blade is fixedly provided on the conveying shaft.

[0008] Preferably, the first driving mechanism includes a conveying shaft extending through and to the outside of the feed box, the end of the conveying shaft is fixedly sleeved with a conical half gear, the top of the rotating column extends through and to the outside of the drying box, and the upper and lower sides of the rotating column are respectively fixedly sleeved with a first bevel gear and a second bevel gear, and the conical half gear is meshingly connected with the first bevel gear and the second bevel gear.

[0009] Preferably, the diameters of the first bevel gear and the second bevel gear are the same, and the diameter of the bevel half gear is larger than the diameters of the first bevel gear and the second bevel gear.

[0010] Preferably, the second driving mechanism includes a driving cavity opened inside the rotating column, a rotating shaft is rotatably connected in the driving cavity, a third bevel gear is fixedly sleeved on the rotating shaft, the cross bar extends through the driving cavity and is fixedly sleeved with a fourth bevel gear, and the third bevel gear and the fourth bevel gear are meshingly connected.

[0011] Preferably, the top end of the rotating shaft extends through and extends to the outside of the rotating column and is fixedly sleeved with a circular gear, and the side wall of the feed box is fixedly connected with a rack, and the rack is meshingly connected with the circular gear.

[0012] Preferably, a cylinder is fixedly provided on both sides of the rotating column, the cross bar is rotatably connected in the cylinder, an annular groove is opened on the inner wall of the cylinder, a limit block is fixedly provided on the outer wall of the cross bar, and the limit block is slidably connected in the annular groove.

[0013] Preferably, a first rotating rod is rotatably connected in the feed pipe, a plurality of cutting knives are evenly arranged on the first rotating rod, a first cavity is opened on the side wall of the feed box, one end of the first rotating rod extends through the first cavity and is fixedly sleeved with a first transmission wheel, a second transmission wheel is fixedly sleeved on the conveying shaft, and the first transmission wheel and the second transmission wheel are connected by a first transmission belt.

[0014] Preferably, the filter box has a first filter plate and a second filter plate hinged on the upper and lower sides respectively, support plates are fixed on the upper and lower sides of the inner wall of the filter box, and springs are fixed between the first filter plate and the second filter plate and the support plates.

[0015] Preferably, a second cavity is formed on the side wall of the filter box, a second rotating rod is rotatably connected to the bottom of the second cavity, the second rotating rod extends into the filter box and is fixedly provided with a cam, the cam is located between the first filter plate and the second filter plate, the other end of the first rotating rod extends into the second cavity and is fixedly provided with a third transmission wheel, a fourth transmission wheel is fixedly provided on the second rotating rod, and the third transmission wheel and the fourth transmission wheel are connected by a second transmission belt.

[0016] The beneficial effects of the livestock manure treatment and recovery device of the present invention are as follows:

[0017] (1) The present invention drives the conveying shaft and the spiral blades to rotate by a driving motor to transport the manure and sewage in the feed box. During the transportation process, the sewage in the manure and sewage falls into the filter box through the filter screen at the bottom of the feed box, and the manure and sewage after preliminary filtration falls into the drying box. The driving motor drives the conveying shaft to rotate and drives the conical half gear to rotate at the same time. The conical half gear rotates to mesh with the first conical gear and the second conical gear to rotate intermittently, so that the first conical gear and the second conical gear drive the rotating column to rotate continuously in the opposite direction, and then the rotating column drives the cross bar and the flip plate to rotate continuously in both directions. When the rotating column is not The circular gear on the top is driven to rotate while rotating forward and reversely. The circular gear drives the rotating shaft in the rotating column in the opposite direction under the action of the rack. The rotation of the rotating shaft drives the third bevel gear to rotate. The third bevel gear meshes with the fourth bevel gear to rotate, thereby driving the cross bar to drive the flip plate to rotate, so as to achieve the purpose that the rotating column drives the cross bar to rotate horizontally continuously, and the cross bar drives the flip plate to flip up and down continuously. This allows the manure to be fully stirred and flipped while it is heated and dried, thereby improving the uniformity of heating the manure during drying, and thus also improving the drying efficiency.

[0018] (2) The present invention arranges a cutting knife in the feed pipe, which drives the second transmission wheel to rotate while the conveying shaft rotates. Under the action of the first transmission belt, the first transmission wheel drives the first rotating rod to rotate synchronously, thereby driving the continuous rotation of the cutting knife, so that the manure and sewage that are agglomerated during the transmission process are crushed by the cutting knife when entering the drying box through the feed pipe, thereby improving the efficiency and effect of subsequent drying of the manure and sewage.

[0019] (3) The present invention arranges a first filter plate and a second filter plate in the filter box. When the first rotating rod rotates, the third transmission wheel is driven to rotate. Under the transmission action of the second transmission belt, the fourth transmission wheel drives the second rotating rod to rotate synchronously, thereby driving the cam to rotate. The rotation of the cam continuously hits the first filter plate and the second filter plate on the upper and lower sides, causing the first filter plate and the second filter plate to vibrate continuously, thereby avoiding clogging of the filter holes, improving the filtering efficiency of sewage in sewage, facilitating subsequent deep treatment of sewage, removing harmful substances therein, and reducing pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 3 It is a side view structural schematic diagram of the connection between the cross bar and the cylinder of the present invention;

[0023] Figure 4 For the present invention Figure 1 The enlarged schematic diagram of point B in the middle;

[0024] Figure 5 It is a schematic diagram of the top view of the connection structure of the rack and the circular gear of the present invention;

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

[0026] Figure 7 For the present invention Figure 1 Enlarged schematic diagram at point D in the middle.

[0027] In the figure: 1. feeding box, 2. filter box, 3. drying box, 4. feeding pipe, 5. rotating column, 6. cross bar, 7. flip plate, 8. heating plate, 9. conveying shaft, 10. driving motor, 11. spiral blade, 12. conical half gear, 13. first conical gear, 14. second conical gear, 15. driving chamber, 16. rotating shaft, 17. third conical gear, 18. fourth conical gear, 19. circular gear, 20. rack, 21 .Cylinder, 22. Annular groove, 23. Limit block, 24. First rotating rod, 25. Cutting knife, 26. First cavity, 27. First transmission wheel, 28. Second transmission wheel, 29. First transmission belt, 30. First filter plate, 31. Second filter plate, 32. Support plate, 33. Spring, 34. Second cavity, 35. Second rotating rod, 36. Cam, 37. Third transmission wheel, 38. Fourth transmission wheel, 39. Second transmission belt. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] like Figure 1-7 As shown, a livestock breeding manure treatment and recovery device comprises a feed box 1, a filter box 2 and a drying box 3, the feed box 1 is fixedly arranged above the filter box 2 and the drying box 3, a feed hopper is fixedly arranged on one side of the top of the feed box 1, a conveying mechanism is arranged in the feed box 1, a filter screen is fixedly arranged at the connection between the bottom of the feed box 1 and the filter box 2, a feed pipe 4 connected to the drying box 3 is fixedly arranged on one side of the bottom of the feed box 1, a rotating column 5 is rotatably connected to the bottom of the drying box 3, cross bars 6 are rotatably connected to the two sides of the rotating column 5, a plurality of flip plates 7 are evenly fixedly arranged on the side walls of the cross bar 6, a heating plate 8 is fixedly arranged on the flip plate 7, a first driving mechanism for rotating the rotating column 5 is arranged on the top of the drying box 3, a second driving mechanism for rotating the cross bar 6 is arranged in the rotating column 5, and the conveying mechanism is linked with the first driving mechanism and the second driving mechanism.

[0030] The conveying mechanism includes a conveying shaft 9 rotatably connected to the feed box 1, one end of the conveying shaft 9 passes through the feed box 1 and is fixedly connected to a driving motor 10, and a spiral blade 11 is fixedly provided on the conveying shaft 9. The driving motor 10 drives the conveying shaft 9 and the spiral blade 11 to rotate, and the feces and sewage in the feed box 1 are transported to the drying box 3. During the transportation process, the sewage in the feces and sewage falls into the filter box 2 through the filter net at the bottom of the feed box 1.

[0031] The first driving mechanism includes a conveying shaft 9 extending through and to the outside of the feed box 1, and a conical half gear 12 is fixedly sleeved at the end of the conveying shaft 9. The top of the rotating column 5 extends through and to the outside of the drying box 3, and the upper and lower sides of the rotating column 5 are respectively fixedly sleeved with a first conical gear 13 and a second conical gear 14, and the conical half gear 12 is meshedly connected with the first conical gear 13 and the second conical gear 14.

[0032] When the driving motor 10 drives the conveying shaft 9 to rotate, it also drives the conical half gear 12 to rotate. The conical half gear 12 rotates to engage the first conical gear 13 and the second conical gear 14 to rotate intermittently, so that the first conical gear 13 and the second conical gear 14 drive the rotating column 5 to rotate intermittently in the opposite direction, so that the rotating column 5 drives the cross bar 6 and the flip plate 7 to rotate forward and reverse continuously, flipping the feces in the drying box 3, thereby improving the uniformity of the feces when heated and dried.

[0033] The diameters of the first bevel gear 13 and the second bevel gear 14 are the same, and the diameter of the bevel half gear 12 is larger than the diameters of the first bevel gear 13 and the second bevel gear 14, so that one rotation of the bevel half gear 12 can fully drive the first bevel gear 13 and the second bevel gear 14 to rotate, thereby driving the rotating column 5 to fully rotate.

[0034] The second driving mechanism includes a driving cavity 15 opened inside the rotating column 5, and a rotating shaft 16 is rotatably connected in the driving cavity 15. The rotating shaft 16 is configured as a damping rotating shaft so that the rotating shaft 16 can rotate with the rotation of the rotating column 5. A third bevel gear 17 is fixedly sleeved on the rotating shaft 16. The cross bar 6 extends through the driving cavity 15 and is fixedly sleeved with a fourth bevel gear 18, and the third bevel gear 17 and the fourth bevel gear 18 are meshingly connected.

[0035] The top end of the rotating shaft 16 extends through and extends to the outside of the rotating column 5 and is fixedly sleeved with a circular gear 19. The side wall of the feed box 1 is fixedly connected with a rack 20, which is meshed with the circular gear 19. When the rotating column 5 reciprocates, the rotating shaft 16 and the circular gear 19 on the top are driven to rotate. Under the action of the rack 20, the circular gear 19 drives the rotating shaft 16 to rotate in the rotating column 5 in the opposite direction. The rotation of the rotating shaft 16 drives the third bevel gear 17 to rotate, and the third bevel gear 17 meshes with the fourth bevel gear 18 to rotate, thereby driving the cross bar 6 to drive the flip plate 7 to rotate, thereby achieving the purpose of driving the flip plate 8 to flip up and down continuously while the rotating column 5 drives the cross bar 6 to rotate horizontally, so that the manure can be fully stirred and flipped while being heated and dried, thereby improving the uniformity of heating the manure during drying, and thus also improving the drying efficiency.

[0036] A cylinder 21 is fixedly provided on both sides of the rotating column 5, and the cross bar 6 is rotatably connected in the cylinder 21. An annular groove 22 is opened on the inner wall of the cylinder 21, and a limit block 23 is fixedly provided on the outer wall of the cross bar 6. The limit block 23 is slidably connected in the annular groove 22. By providing the annular groove 22 and the limit block 23, the stability of the cross bar 6 when rotating on both sides of the rotating column 5 can be improved without affecting the rotation of the cross bar 6 in the cylinder 21.

[0037] A first rotating rod 24 is rotatably connected in the feed pipe 4, and a plurality of cutting knives 25 are evenly arranged on the first rotating rod 24. A first cavity 26 is opened on the side wall of the feed box 1, and one end of the first rotating rod 24 extends through the first cavity 26 and is fixedly sleeved with a first transmission wheel 27. A second transmission wheel 28 is fixedly sleeved on the conveying shaft 9. The first transmission wheel 27 and the second transmission wheel 28 are connected by a first transmission belt 29. When the conveying shaft 9 rotates, the second transmission wheel 28 is driven to rotate. Under the action of the first transmission belt 29, the first transmission wheel 27 drives the first rotating rod 24 to rotate synchronously, thereby driving the continuous rotation of the cutting knives 25, so that the feces and sewage that are agglomerated during the transmission process are crushed by the cutting knives 25 when entering the drying box 3 through the feed pipe 4, thereby improving the efficiency and effect of subsequent drying of the feces and sewage.

[0038] The first filter plate 30 and the second filter plate 31 are hinged on the upper and lower sides of the filter box 2 respectively. The filter holes of the first filter plate 30 are larger than the filter holes of the second filter plate 31. Support plates 32 are fixedly provided on the upper and lower sides of the inner wall of the filter box 2. Springs 33 are fixedly provided between the first filter plate 30 and the second filter plate 31 and the support plates 32. The sewage filtered by the first filter plate 30 and the second filter plate 31 is convenient for subsequent deep treatment of the sewage to remove harmful substances therein and reduce pollution to the environment.

[0039] A second cavity 34 is formed on the side wall of the filter box 2, and a second rotating rod 35 is rotatably connected to the lower part of the second cavity 34. The second rotating rod 35 extends into the filter box 2 and is fixed with a cam 36. The cam 36 is located between the first filter plate 30 and the second filter plate 31. The other end of the first rotating rod 24 extends into the second cavity 34 and is fixedly sleeved with a third transmission wheel 37. A fourth transmission wheel 38 is fixedly sleeved on the second rotating rod 35. The third transmission wheel 37 and the fourth transmission wheel 38 are connected through a second transmission belt 39.

[0040] When the first rotating rod 24 rotates, the third transmission wheel 37 is driven to rotate. Under the transmission action of the second transmission belt 39, the fourth transmission wheel 38 drives the second rotating rod 35 to rotate synchronously, and then drives the cam 36 to rotate. The rotation of the cam 36 continuously hits the first filter plate 30 and the second filter plate 31 on the upper and lower sides, so that the first filter plate 30 and the second filter plate 31 continuously vibrate, thereby avoiding clogging of the filter holes and improving the filtering efficiency of sewage.

[0041] The outer walls of one side of the filter box 2 and the drying box 3 are both hinged with sealed box doors, which are convenient for cleaning the residues on the first filter plate 30 and the second filter plate 31 in the filter box 2, and for subsequent processing of the dried feces in the drying box 3.

[0042] When in use, the feces and sewage that need to be recycled and processed are added into the feed box 1 from the feed hopper, and the driving motor 10 drives the conveying shaft 9 to drive the spiral blade 11 to rotate and convey the feces and sewage filtered by the filter screen to the drying box 3. When the feces and sewage enter the drying box 3 through the feed pipe 4, they are crushed by the cutting knife 25. While the conveying shaft 9 rotates, it drives the conical half gear 12 to continuously mesh with the first conical gear 13 and the second conical gear 14 on both sides to rotate in the forward and reverse directions, so that the rotating column 5 drives the cross bar 6 and the flip plate 7 to rotate forward and reverse continuously, and while the rotating column 5 rotates forward and reverse, it drives the rotating shaft 16 and the circular top The gear 19 rotates, and the circular gear 19 drives the rotating shaft 16 to rotate in the rotating column 5 in the opposite direction under the action of the rack 20. The rotation of the rotating shaft 16 drives the third bevel gear 17 to rotate, and the third bevel gear 17 engages with the fourth bevel gear 18 to rotate, thereby driving the cross bar 6 to drive the flip plate 7 to rotate, thereby achieving the purpose that while the rotating column 5 drives the cross bar 6 to continuously reciprocate horizontally, the cross bar 6 drives the flip plate 8 to continuously flip up and down, so that the manure can be fully stirred and flipped while being heated and dried, thereby improving the uniformity of heating of the manure during drying, and thereby also improving the drying efficiency.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A livestock manure treatment and recovery device, comprising a feed box (1), a filter box (2) and a drying box (3), characterized in that: The feed box (1) is fixedly arranged above the filter box (2) and the drying box (3); a conveying mechanism is arranged inside the feed box (1); a filter screen is fixedly arranged at the connection between the bottom of the feed box (1) and the filter box (2); a feed pipe (4) connected to the drying box (3) is fixedly arranged on one side of the bottom of the feed box (1); a rotating column (5) is rotatably connected to the bottom of the drying box (3); cross bars (6) are rotatably connected to the two sides of the rotating column (5); a plurality of flip plates (7) are evenly fixedly arranged on the side walls of the cross bars (6); a heating plate (8) is fixedly arranged on the flip plates (7); a first driving mechanism for rotating the rotating column (5) is arranged on the top of the drying box (3); a second driving mechanism for rotating the cross bar (6) is arranged inside the rotating column (5); and the conveying mechanism is arranged in linkage with the first driving mechanism and the second driving mechanism.

2. The livestock manure treatment and recovery device according to claim 1 is characterized by: The conveying mechanism comprises a conveying shaft (9) rotatably connected to a conveying box (1), one end of the conveying shaft (9) passes through the conveying box (1) and is fixedly connected to a driving motor (10), and a spiral blade (11) is fixedly provided on the conveying shaft (9).

3. The livestock manure treatment and recovery device according to claim 2 is characterized by: The first driving mechanism comprises a conveying shaft (9) extending through and to the outside of the feed box (1), the end of the conveying shaft (9) is fixedly sleeved with a conical half gear (12), the top of the rotating column (5) extends through and to the outside of the drying box (3), and the upper and lower sides of the rotating column (5) are respectively fixedly sleeved with a first conical gear (13) and a second conical gear (14), and the conical half gear (12) is meshingly connected with the first conical gear (13) and the second conical gear (14).

4. The livestock manure treatment and recovery device according to claim 3 is characterized by: The diameters of the first bevel gear (13) and the second bevel gear (14) are the same, and the diameter of the bevel half gear (12) is larger than the diameters of the first bevel gear (13) and the second bevel gear (14).

5. The livestock manure treatment and recovery device according to claim 3 is characterized by: The second driving mechanism comprises a driving chamber (15) opened inside the rotating column (5), a rotating shaft (16) is rotatably connected inside the driving chamber (15), a third bevel gear (17) is fixedly sleeved on the rotating shaft (16), the cross bar (6) extends through the driving chamber (15) and is fixedly sleeved with a fourth bevel gear (18), and the third bevel gear (17) and the fourth bevel gear (18) are meshingly connected.

6. The livestock manure treatment and recovery device according to claim 5 is characterized by: The top end of the rotating shaft (16) extends through the outside of the rotating column (5) and is fixedly sleeved with a circular gear (19); the side wall of the feed box (1) is fixedly connected with a rack (20), and the rack (20) is meshingly connected with the circular gear (19).

7. The livestock manure treatment and recovery device according to claim 6 is characterized by: A cylinder (21) is fixedly provided on both sides of the rotating column (5), the cross bar (6) is rotatably connected in the cylinder (21), an annular groove (22) is provided on the inner wall of the cylinder (21), a limit block (23) is fixedly provided on the outer wall of the cross bar (6), and the limit block (23) is slidably connected in the annular groove (22).

8. The livestock manure treatment and recovery device according to claim 2 is characterized by: A first rotating rod (24) is rotatably connected inside the feed pipe (4), and a plurality of cutting knives (25) are evenly arranged on the first rotating rod (24). A first cavity (26) is opened on the side wall of the feed box (1), and one end of the first rotating rod (24) extends through the first cavity (26) and is fixedly sleeved with a first transmission wheel (27). A second transmission wheel (28) is fixedly sleeved on the conveying shaft (9), and the first transmission wheel (27) and the second transmission wheel (28) are connected in transmission via a first transmission belt (29).

9. The livestock manure treatment and recovery device according to claim 8, characterized in that: A first filter plate (30) and a second filter plate (31) are hingedly connected at the upper and lower sides of the filter box (2), support plates (32) are fixedly provided at the upper and lower sides of the inner wall of the filter box (2), and a spring (33) is fixedly provided between the first filter plate (30) and the second filter plate (31) and the support plate (32).

10. The livestock manure treatment and recovery device according to claim 9, characterized in that: A second cavity (34) is formed on the side wall of the filter box (2); a second rotating rod (35) is rotatably connected below the second cavity (34); the second rotating rod (35) extends through the filter box (2) and is fixedly provided with a cam (36); the cam (36) is located between the first filter plate (30) and the second filter plate (31); the other end of the first rotating rod (24) extends through the second cavity (34) and is fixedly provided with a third transmission wheel (37); a fourth transmission wheel (38) is fixedly provided on the second rotating rod (35); the third transmission wheel (37) and the fourth transmission wheel (38) are connected in transmission via a second transmission belt (39).

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