Speed reducer with unloading function

Abstract

The speed reducer with the unloading function comprises a first box body and a second box body which are connected, a transmission shaft and a first worm are rotationally arranged in the first box body, the transmission shaft is perpendicular to the first worm, a first worm gear is installed on the transmission shaft, the first worm is meshed with the first worm gear, a second worm and an output shaft are rotationally arranged in the second box body, and the output shaft is meshed with the second worm. The second worm is perpendicular to the output shaft, a second worm wheel is installed on the output shaft through an unloading mechanism, the second worm is meshed with the second worm wheel, and one end of the transmission shaft is connected with one end of the second worm through a transmission piece. The unloading device is simple in structure, and unloading can be completed when the load exceeds a set value.

Description

Technical Field

[0001] The present invention relates to the technical field of reducers, and more specifically, to a reducer with an unloading function. Background Art

[0002] In the development of industrial transmission technology, reducers play an important role. In the industrial production process, system overload may occur due to various reasons. If the overload cannot be prevented in time, it will cause damage to one or more important equipment in the power system, shutdown, etc., resulting in huge losses. Therefore, it is necessary to increase the unloading capacity of the reducer to play an effective overload protection role. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a speed reducer with an unloading function.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The invention discloses a speed reducer with an unloading function, comprising a case body 1 and a case body 2 which are connected. A transmission shaft and a worm gear 1 are rotatably arranged in the case body 1, the transmission shaft and the worm gear 1 are perpendicular to each other, a worm wheel 1 is mounted on the transmission shaft, the worm gear 1 is meshed with the worm wheel 1, a worm gear 2 and an output shaft are rotatably arranged in the case body 2, the worm gear 2 is perpendicular to the output shaft, a worm wheel 2 is mounted on the output shaft via an unloading mechanism, the worm gear 2 is meshed with the worm wheel 2, and one end of the transmission shaft is connected to one end of the worm gear 2 via a transmission member.

[0006] Furthermore, the unloading mechanism includes a limit ring installed on the output shaft, a limit ring is arranged on the output shaft, an outer diameter of the limit ring is larger than the diameter of the output shaft, a sleeve is sleeved on the output shaft, one end of the sleeve abuts against the side of the limit ring, the sleeve includes a positioning ring, a positioning groove is provided on the side of the worm gear 2 close to the positioning ring, the positioning ring abuts against the positioning groove, a tapered sleeve is sleeved on the sleeve, a tapered surface is arranged on the outer periphery of the tapered sleeve, an abutting surface is arranged inside the worm gear 2, a butterfly spring is sleeved on the sleeve, the sleeve also includes a threaded section, an adjusting ring is threadedly connected to the threaded section, the adjusting ring abuts against one end of the butterfly spring, the other end of the butterfly spring abuts against the tapered sleeve, and under the action of the butterfly spring, the cone surface abuts against the abutting surface.

[0007] Furthermore, an adjustment hole is provided at the lower portion of the second box body, and the adjustment hole is located below the adjustment ring.

[0008] Furthermore, the conical surface includes a first conical surface, a second conical surface and a third conical surface. The first conical surface is located inside the worm gear 2, and the second conical surface and the third conical surface are located outside the worm gear 2. The end of the conical sleeve located inside the worm gear 2 is a certain distance away from the end face of the positioning ring. The first conical surface, the second conical surface and the third conical surface have the same inclination. The diameter of the second conical surface close to the first conical surface is smaller than the diameter of the end away from the first conical surface, and the diameter of the second conical surface close to the first conical surface is smaller than the diameter of the first conical surface close to the second conical surface. The diameter of the third conical surface close to the second conical surface is smaller than the diameter of the second conical surface close to the third conical surface.

[0009] Furthermore, the conical surface also includes a fourth conical surface, which is located at an end of the second conical surface away from the second conical surface, and a diameter of the end of the third conical surface close to the third conical surface is smaller than a diameter of the end of the fourth conical surface close to the third conical surface.

[0010] Furthermore, the cone sleeve is formed by several cone blocks spliced ​​together by bolts, a receiving groove is provided on the side of the cone block, a friction block is installed in the receiving groove, the inclination of the outer periphery of the friction block is the same as that of the first cone surface, and several springs are connected between the bottom of the friction block and the bottom of the receiving groove.

[0011] Furthermore, a moving groove and a connecting groove are provided on the side of the cone block, the connecting groove is connected with the storage groove and the moving groove, the lower end of the friction block is connected with a support rod, the lower end of the support rod passes through the connecting groove and extends into the moving groove, the lower end of the support rod is provided with an abutment slope, a moving rod is movably arranged in the moving groove, one end of the moving rod is provided with a guide slope, the guide slope abuts the abutment slope, an adjusting nut is threadedly connected to the threaded section, and the other end of the moving rod is arranged to extend out of the moving groove.

[0012] Furthermore, the transmission member includes a transmission sleeve, a connecting hole is provided at one end of the transmission sleeve close to the transmission shaft, one end of the transmission shaft is inserted into the connecting hole, a limiting groove is provided at one end of the transmission sleeve close to the second worm, the end of the second worm is connected to a limiting block, and the limiting block is inserted into the limiting groove.

[0013] Furthermore, bearings 1 are installed on two opposite inner walls inside the box body 1, and the transmission shaft is rotatably arranged on the two bearings 1.

[0014] The beneficial effects of the present invention are as follows: when the load exceeds a set threshold, the worm gear 2 can be separated from the tapered sleeve for unloading; after the excess load disappears, the worm gear can drive the output shaft through the tapered sleeve to complete transmission; the structure is simple and the operation is reliable; the conical surface on the tapered sleeve can continue to extend into the worm gear to make up for the gap between the conical surface and the worm gear after wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a reducer with an unloading function in this embodiment;

[0016] Figure 2is a cross-sectional view of the second box in this embodiment;

[0017] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0018] Figure 4 A schematic diagram of the structure of a cone sleeve in another embodiment;

[0019] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0020] Figure 6 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0021] Figure 7 for Figure 4 Enlarged schematic diagram of point C in the middle.

[0022] Figure numerals: 1, box body 1; 2, box body 2; 3, transmission shaft; 4, bearing 1; 5, worm wheel 1; 6, worm gear 1; 7, threaded section; 8, output shaft; 9, worm wheel 2; 10, worm gear 2; 11, bearing 2; 12, limit seat; 13, transmission sleeve; 14, connecting hole; 15, limit groove; 16, limit block; 17, taper sleeve; 18, butterfly spring; 19, adjustment ring; 20, adjustment hole; 21, bearing 3; 22, mounting seat; 23, snap ring; 24, bearing 4; 25, sleeve; 26, limit 1. Positioning ring; 27. Positioning ring; 28. Positioning groove; 29. ​​Conical surface; 30. Abutment surface; 31. First conical surface; 32. Second conical surface; 33. Third conical surface; 34. Adjusting nut; 35. Moving groove; 36. Fixing bolt; 37. Limiting switch; 38. End plate; 39. Ring groove; 40. Receiving groove; 41. Friction block; 42. Connecting groove; 43. Spring; 44. Support rod; 45. Abutment slope; 46. Moving rod; 47. Guide slope; 48. Fixing groove; 49. Insert block; 50. Fourth conical surface. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1-Figure 7As shown, a speed reducer with unloading function includes a case 1 and a case 2 connected to each other, a worm 6 and a transmission shaft 3 are rotatably arranged in the case 1, the transmission shaft 3 and the worm 6 are perpendicular to each other, a worm wheel 5 is keyed to the transmission shaft 3, and the worm wheel 5 is meshed with the worm 6. A bearing 4 is installed on each of the two opposite side walls of the case 1, and the transmission shaft 3 is rotatably installed in the two bearings 4, and the two bearings 4 provide rotational support for the transmission shaft 3.

[0025] like Figure 2 , Figure 3 As shown, a worm 10 and an output shaft 8 are rotatably arranged in the housing 2, the worm 10 and the output shaft 8 are perpendicular, and a worm wheel 9 is installed on the output shaft 8 through an unloading mechanism, and the worm wheel 9 can mesh with the worm 10. The unloading mechanism includes a sleeve 25 keyed to the worm wheel 9, a limiting ring 26 is arranged on the output shaft 8, the outer diameter of the limiting ring 26 is larger than the diameter of the output shaft 8, one end of the sleeve 25 abuts against the side of the limiting ring 26, and the sleeve 25 includes a positioning ring 27, which is located at one end of the sleeve 25 close to the limiting ring 26, and the outer diameter of the positioning ring 27 is larger than the diameter of the sleeve 25. A tapered sleeve 17 is sleeved on the sleeve 25, the outer peripheral surface of the tapered sleeve 17 is a tapered surface 29, the outer surface of the tapered sleeve 17 is provided with a worm wheel 9, and a contact surface 30 is provided in the worm wheel 9, and the tapered surface 29 is in contact with the contact surface 30. The shaft sleeve 25 is sleeved with a butterfly spring 18, which is located on the side of the cone sleeve 17 away from the positioning ring 27. The shaft sleeve 25 includes a threaded section 7, which is located on one end of the shaft sleeve 25 away from the positioning ring 27. The threaded section 7 is threadedly connected with an adjustment ring 19, which abuts against one end face of the butterfly spring 18, and the other end face of the butterfly spring 18 abuts against the cone sleeve 17. A positioning groove 28 is provided on the side of the worm gear 29 close to the positioning ring 27. Under the action of the butterfly spring 18, the positioning groove 28 abuts against the positioning ring 27. When the axial load of the worm gear 29 exceeds the set threshold, the worm gear 29 drives the cone sleeve 17 to move toward the side of the butterfly spring 18 through the abutment of the abutment surface 30 and the cone surface 29 to compress the butterfly spring 18. Thereby, the worm gear 29 is disengaged from the worm 210 to complete the unloading. When the load exceeds the limit, the butterfly spring 18 can push the cone sleeve 17 to drive the worm wheel 2 9 to move, so that the worm wheel 2 9 and the worm 2 10 resume the meshing state.

[0026] An adjustment hole 20 is provided at the lower part of the box body 2 corresponding to the position below the adjustment ring 19. A turning tool is passed through the adjustment hole 20 to turn the adjustment ring 19, thereby adjusting the contraction degree of the butterfly spring 18 to change the force acting on the cone sleeve 17, thereby changing the set load threshold.

[0027] like Figure 2As shown, a bearing 4 24 is installed on the inner wall of one side of the box body 2, a mounting seat 22 is installed on the inner wall of the box body 2 opposite to the bearing 4 24, a bearing 3 21 is installed on the side of the mounting seat 22 close to the bearing 4 24, the output shaft 8 is installed in the bearing 3 21 and the bearing 4 24, and the bearing 3 21 and the bearing 4 24 provide rotational support for the output shaft 8. A snap ring 23 is clamped on the box body 2, and the side of the mounting seat 22 away from the bearing 4 24 abuts against the snap ring 23, so that the mounting seat 22 is limitedly installed in the box body 2.

[0028] Two bearings 2 11 are installed on the inner wall of the box 2, and the two ends of the worm 2 10 are rotatably arranged in the bearings 2 11, and the bearings 2 11 provide rotational support for the worm 2 10. A limit seat 12 is arranged on the worm 2 10 near the bearing 2 11, and the limit seat 12 is in a truncated cone shape, and the diameter of the limit seat 12 near the bearing 2 11 is larger than the diameter of the end away from the bearing 2 11. The limit seat 12 is arranged against the bearing 2 11, thereby completing the axial limit of the worm 2 10 and preventing the worm 2 10 from moving.

[0029] One end of the transmission shaft 3 is arranged through the housing 1, and one end of the worm 10 is arranged outside the housing 2. The end of the transmission shaft 3 extending outside the housing 1 is connected to the end of the worm 10 extending outside the housing 2 through a connecting piece. Specifically, the connecting piece includes a transmission sleeve 13, and the transmission sleeve 13 is provided with a connecting hole 14 on the side facing the transmission shaft 3. The end of the transmission shaft 3 is inserted into the connecting hole 14 and connected to the transmission sleeve 13 through a key. A limiting groove 15 is provided on the side of the transmission sleeve 13 close to the worm 10, and a limiting block 16 is connected to the end of the worm 10, and the limiting block 16 is inserted into the limiting groove 15. The transmission shaft 3 and the worm 10 are transmitted through the connecting piece.

[0030] like Figure 4 , Figure 5As shown, when the output shaft 8 encounters a large load, which exceeds the friction transmission between the worm gear 29 and the cone sleeve 17, the worm gear 29 can rotate relative to the cone sleeve 17, and the abutment surface 30 and the cone surface 29 will rub against each other, thereby causing wear on the surface of the cone surface 29. After the reducer has been used for a long time, the accumulated wear will cause a gap between the cone surface 29 and the abutment surface 30, which will cause the worm gear 29 to be unable to rely on the friction between the abutment surface 30 and the cone surface 29 to drive the cone sleeve 17 to rotate, and thus cannot be output through the output shaft 8 well. The conical surface 29 is configured to include a first conical surface 31, a second conical surface 32 and a third conical surface 33, the first conical surface 31 being located inside the worm gear 29, the second conical surface 32 and the third conical surface 33 being located outside the worm gear 29, the second conical surface 32 being located at an end of the first conical surface 31 away from the positioning ring 27, the third conical surface 33 being located at an end of the second conical surface 32 away from the first conical surface 31, the end of the taper sleeve 17 located inside the worm gear 29 being a certain distance away from the end surface of the positioning ring 27, the first conical surface 31, the second conical surface 32 and the third conical surface 33 having the same inclination, the diameter of the end of the second conical surface 32 close to the first conical surface 31 being smaller than the diameter of the end away from the first conical surface 31, and the diameter of the end of the second conical surface 32 close to the first conical surface 31 being smaller than the diameter of the end of the first conical surface 31 close to the second conical surface 32, and the diameter of the end of the third conical surface 33 close to the second conical surface 32 being smaller than the diameter of the end of the second conical surface 32 close to the third conical surface 33.

[0031] The condition of the components in the box body 2 is observed through the adjustment hole 20. After the first cone surface 31 is worn, the adjustment ring 19 is turned to act on the butterfly spring 18 to drive the cone sleeve 17 to move, so that the second cone surface 32 enters into the worm gear 2 9, and at the same time, the first cone surface 31 enters to a position where the diameter of the abutment surface 30 is smaller. At this time, the second cone surface 32 and the first cone surface 31 can abut against the abutment surface 30, so that there is sufficient friction between the second cone surface 32, the first cone surface 31 and the abutment surface 30 to complete the transmission between the worm gear 2 9 and the cone sleeve 17.

[0032] After the second cone surface 32 and the first cone surface 31 are worn again, the cone sleeve 17 can be pushed further, so that the third cone surface 33 enters the worm gear 2 9, so that the third cone surface 33, the second cone surface 32, and the first cone surface 31 are all in contact with the abutment surface 30, increasing the friction force to complete the transmission between the worm gear 2 9 and the cone sleeve 17. Thus, good unloading and transmission capabilities can be maintained, and the service life is longer.

[0033] The conical surface 29 further includes a fourth conical surface 50, which is located at an end of the second conical surface 32 away from the second conical surface 32, and the diameter of the end of the third conical surface 33 close to the third conical surface 33 is smaller than the diameter of the end of the fourth conical surface 50 close to the third conical surface 33. After the third conical surface 33 enters the worm gear 29, the fourth conical surface 50 acts as a limiter, which can prevent the cone sleeve 17 from continuing to move toward the worm gear 29 and prevent the cone sleeve 17 from being inserted too deeply into the worm gear 29.

[0034] like Figure 6 , Figure 7 As shown, the cone sleeve 17 is formed by splicing a number of cone blocks by bolts, and a receiving groove 40 is provided on the side of the cone block. A friction block 41 is installed in the receiving groove 40. The inclination of the outer periphery of the friction block 41 is the same as that of the first cone surface 31. A number of springs 43 are connected between the bottom of the friction block 41 and the bottom of the receiving groove 40. Relative to the left side, there will be a second cone surface 32 and a third cone surface 33 added to contact the abutment surface 30. The right side of the first cone surface 31 will always rub against the abutment surface 30. After a long time, it is easy to wear more seriously than the left side, and the gap with the abutment surface 30 will be larger, and it will not provide enough friction to transmit. By providing the receiving groove 40, the upper end of the friction block 41 is located in the receiving groove 40, and no friction will be generated with the abutment surface 30 in the initial stage. After the right end of the first cone surface 31 is worn, the friction block 41 can be exposed to abut against the abutment surface 30 to provide friction.

[0035] A movable groove 35 and a connecting groove 42 are also provided on the side of the cone block. The movable groove 35 is arranged along the axial direction of the cone sleeve 17, and the connecting groove 42 is arranged along the radial direction of the cone sleeve 17. The connecting groove 42 is connected with the receiving groove 40 and the movable groove 35. One end of the movable groove 35 is connected with the end of the cone block close to the butterfly spring 18. A support rod 44 is connected to the lower end of the friction block 41. The lower end of the support rod 44 passes through the connecting groove 42 and extends into the movable groove 35. An abutment slope 45 is provided at the lower end of the support rod 44. A movable rod 46 is movably arranged in the movable groove 35. A guide slope 47 is provided at one end of the movable rod 46. The guide slope 47 abuts against the abutment slope 45. An adjusting nut 34 is threadedly connected to the threaded section 7. The adjusting nut 34 is located on the side of the adjusting ring 19 close to the butterfly spring 18, and the other end of the movable rod 46 is arranged to extend out of the movable groove 35. An end plate 38 is installed on the side of the adjusting nut 34 close to the moving rod 46 through a fixing bolt 36. An annular groove 39 is provided on the side of the end plate 38 close to the adjusting nut 34. An annular notch is provided on the side of the end plate 38 close to the moving rod 46 at a position corresponding to the annular groove 39. The end of the moving rod 46 passes through the annular notch and is connected to the limit switch 37. The limit switch 37 is located in the annular groove 39. The diameter of the limit switch 37 is larger than the moving rod 46. By turning the adjusting nut 34, the adjusting nut 34 is moved, so that the moving rod 46 is driven to move in the moving groove 35 through the cooperation of the annular groove 39 and the limit switch 37. The guiding inclined surface 47 on the moving rod 46 cooperates with the abutting inclined surface 45 of the support rod 44 to drive the support rod 44 to move upward, thereby driving the friction block 41 to rise to abut against the abutting surface 30, increase the friction area, and provide sufficient friction force.

[0036] A fixing groove 48 is formed at the end of the movable groove 35 , and an insert block 49 is connected to the end of the movable rod 46 . The insert block 49 can be inserted into the fixing groove 48 , so that the movable rod 46 will not deviate and remain against the lower end of the support rod 44 .

[0037] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A reducer with unloading function, characterized in that: The invention comprises a case body 1 (1) and a case body 2 (2) connected to each other. A transmission shaft (3) and a worm gear 1 (6) are rotatably arranged in the case body 1 (1). The transmission shaft (3) and the worm gear 1 (6) are perpendicular to each other. A worm gear 1 (5) is mounted on the transmission shaft (3). The worm gear 1 (6) meshes with the worm gear 1 (5). A worm gear 2 (10) and an output shaft (8) are rotatably arranged in the case body 2 (2). The worm gear 2 (10) and the output shaft (8) are perpendicular to each other. A worm gear 2 (9) is mounted on the output shaft (8) via an unloading mechanism. The worm gear 2 (10) and the worm gear 2 (9) mesh with each other. One end of the transmission shaft (3) and one end of the worm gear 2 (10) are connected via a transmission member.

2. A reducer with unloading function according to claim 1, characterized in that: The unloading mechanism comprises a limit ring (26) mounted on the output shaft (8), the outer diameter of the limit ring (26) being larger than the diameter of the output shaft (8), a sleeve (25) being sleeved on the output shaft (8), one end of the sleeve (25) being against the side of the limit ring (26), the sleeve (25) comprising a positioning ring (27), a positioning groove (28) being formed on a side of the worm gear (9) close to the positioning ring (27), the positioning ring (27) being against the positioning groove (28), and a tapered sleeve (17) being sleeved on the sleeve (25). The outer periphery of the cone sleeve (17) is provided with a cone surface (29), the interior of the worm gear (9) is provided with a contact surface (30), the shaft sleeve (25) is sleeved with a butterfly spring (18), the shaft sleeve (25) further comprises a threaded section (7), an adjusting ring (19) is threadedly connected to the threaded section (7), the adjusting ring (19) abuts against one end of the butterfly spring (18), the other end of the butterfly spring (18) abuts against the cone sleeve (17), and under the action of the butterfly spring (18), the cone surface (29) abuts against the contact surface (30).

3. A reducer with unloading function according to claim 2, characterized in that: An adjustment hole (20) is provided at the lower part of the second box body (2), and the adjustment hole (20) is located below the adjustment ring (19).

4. A reducer with unloading function according to claim 2, characterized in that: The conical surface (29) comprises a first conical surface (31), a second conical surface (32) and a third conical surface (33); the first conical surface (31) is located inside the worm gear (9); the second conical surface (32) and the third conical surface (33) are located outside the worm gear (9); the end of the conical sleeve (17) located inside the worm gear (9) is a certain distance away from the end surface of the positioning ring (27); the first conical surface (31), the second conical surface (32) and the third conical surface (33) have the same inclination; the diameter of the end of the second conical surface (32) close to the first conical surface (31) is smaller than the diameter of the end away from the first conical surface (31); the diameter of the end of the second conical surface (32) close to the first conical surface (31) is smaller than the diameter of the end of the first conical surface (31) close to the second conical surface (32); the diameter of the end of the third conical surface (33) close to the second conical surface (32) is smaller than the diameter of the end of the second conical surface (32) close to the third conical surface (33).

5. A reducer with unloading function according to claim 2, characterized in that: The conical surface (29) further comprises a fourth conical surface (50), wherein the fourth conical surface (50) is located at an end of the second conical surface (32) away from the second conical surface (32), and the diameter of the end of the third conical surface (33) close to the third conical surface (33) is smaller than the diameter of the end of the fourth conical surface (50) close to the third conical surface (33).

6. A reducer with unloading function according to claim 1, characterized in that: The cone sleeve (17) is formed by splicing a plurality of cone blocks, a receiving groove (40) is provided on the side of the cone block, a friction block (41) is installed in the receiving groove (40), the inclination of the outer periphery of the friction block (41) is the same as that of the first cone surface (31), and a plurality of springs (43) are connected between the bottom of the friction block (41) and the bottom of the receiving groove (40).

7. A reducer with unloading function according to claim 1, characterized in that: The side surface of the cone block is also provided with a moving groove (35) and a connecting groove (42), the connecting groove (42) is connected with the storage groove (40) and the moving groove (35), the lower end of the friction block (41) is connected with a support rod (44), the lower end of the support rod (44) passes through the connecting groove (42) and extends into the moving groove (35), the lower end of the support rod (44) is provided with an abutting inclined surface (45), a moving rod (46) is movably arranged in the moving groove (35), one end of the moving rod (46) is provided with a guiding inclined surface (47), the guiding inclined surface (47) abuts against the abutting inclined surface (45), an adjusting nut (34) is threadedly connected to the threaded section (7), and the other end of the moving rod (46) is arranged to pass through the moving groove (35).

8. The reducer with unloading function according to claim 1, characterized in that: The transmission member comprises a transmission sleeve (13), a connection hole (14) is provided at one end of the transmission sleeve (13) close to the transmission shaft (3), one end of the transmission shaft (3) is inserted into the connection hole (14), a limiting groove (15) is provided at one end of the transmission sleeve (13) close to the second worm gear (10), the end of the second worm gear (10) is connected to a limiting block (16), and the limiting block (16) is inserted into the limiting groove (15).

9. A reducer with unloading function according to claim 1, characterized in that: Bearings (4) are installed on two opposite inner walls of the box body (1), and the transmission shaft (3) is rotatably arranged on the two bearings (4).

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