Lifting mechanism of stepping type self-moving tail for belt conveyor

Abstract

The invention relates to a lifting mechanism of a stepping type self-moving tail for a belt conveyor, which is mounted on an I-shaped bottom frame of the self-moving tail, the lifting mechanism comprises a hydraulic cylinder, a cylinder barrel of the hydraulic cylinder is connected with a mounting plate, the lifting mechanism further comprises two frame bodies, grooves for clamping the mounting plate are formed in the two frame bodies, and the mounting plate is arranged in the grooves. The two frame bodies are further provided with grooves used for being connected with a plate on the top of the bottom frame in an inserted mode. The upper groove walls and the lower groove walls of the grooves, corresponding to the bottom frame, of the frame bodies are rotationally connected with balls. Connecting groove bodies in one-to-one correspondence with the frame bodies are connected to the lower surface of the mounting plate in a sliding mode, openings of the two connecting groove bodies are far away from each other, the part between the two grooves of each frame body can be clamped into the connecting groove bodies, and a driving piece for driving the connecting groove bodies to move in the width direction of the bottom frame is further arranged on the mounting plate; and the connecting groove body and the frame body are respectively provided with a hole for inserting the positioning pin. The stepping type self-moving machine tail has the effect that the efficiency of maintaining the stepping type self-moving machine tail by an operator is improved.

Description

Technical Field

[0001] The present application relates to the field of a walking type self-moving tail, and in particular to a lifting mechanism of a walking type self-moving tail for a belt conveyor. Background Art

[0002] The step-type self-moving tail for the belt conveyor includes two I-shaped base frames, on which a self-moving tail body is jointly arranged, and a lateral moving mechanism and a vertical lifting mechanism are installed on the base frames. The vertical lifting mechanism includes a mounting frame slidably connected to the base frames, and a lifting hydraulic cylinder is installed on the mounting frame. When the self-moving tail body is lifted, the mounting frame supports the lifting hydraulic cylinder and the self-moving tail; when the lateral moving mechanism works to drive the self-moving tail body to move, the self-moving tail body drives the hydraulic cylinder and the mounting frame to slide along the base frame.

[0003] When the self-moving tail is working, the friction between the mounting frame and the base frame causes the mounting frame to wear. When the mounting frame is worn to a certain extent, the mounting frame needs to be replaced. Since the mounting frame is an integral part, it is inconvenient for the operator to remove the mounting frame located in the middle from the base frame, and the operator's efficiency in repairing the walking self-moving tail is low. Summary of the invention

[0004] In order to improve the efficiency of operators in repairing a walking type self-moving tail, the present application provides a lifting mechanism for a walking type self-moving tail for a belt conveyor.

[0005] The present application provides a lifting mechanism for a belt conveyor with a step-type self-moving tail, which adopts the following technical solution: A lifting mechanism for a step-type self-moving tail of a belt conveyor is installed on an I-shaped bottom frame of the self-moving tail, the lifting mechanism includes a hydraulic cylinder, a mounting plate is connected to the cylinder barrel of the hydraulic cylinder, and the lifting mechanism also includes two frames, both of which are provided with grooves for clamping the mounting plate, and both frames are provided with grooves for plugging the plate on the top of the bottom frame, and the upper groove walls and lower groove walls of the grooves corresponding to the frame and the bottom frame are rotatably connected with balls; The lower surface of the mounting plate is slidably connected with a connecting groove body corresponding to the frame body one by one, the openings of the two connecting groove bodies are far away from each other, and the part between the two grooves of the frame body can be inserted into the connecting groove body, and the mounting plate is also provided with a driving member for driving the connecting groove body to move along the width direction of the base frame; It also includes a fixing pin, and the connecting slot body and the frame body are both provided with holes for the fixing pin to be inserted.

[0006] By adopting the above technical solution, when installing the hydraulic cylinder, the operator places the mounting plate on the base frame, and then places the corresponding two frames on both sides of the base frame respectively, and pushes the frames toward the base frame. During this process, a gap is maintained between the mounting plate and the base frame for the connecting groove to move. When the frame moves, the driving member works to move the connecting groove toward the corresponding frame until the connecting groove is sleeved on the corresponding position of the frame. At this time, the holes on the connecting groove and the frame corresponding to the fixing pins are aligned, and the operator inserts the fixing pins into the holes of the frame and the connecting groove, so as to fix the frame and the mounting plate. At this time, the installation of the mounting plate and the frame is completed.

[0007] When it is necessary to remove a certain mounting plate or frame, the operator pulls out the corresponding fixing pin, and then the driving part works to reset the connecting groove, and the connecting groove and the corresponding frame are released. At this time, the operator can easily remove the frame, thereby facilitating the operator to replace the frame, mounting plate and hydraulic cylinder, thereby improving the efficiency of the operator in repairing the step-type self-moving machine tail.

[0008] Optionally, a cavity is provided in the mounting plate, support rods are fixedly connected to the connecting grooves, all support rods are arranged alternately, the support rods are slidably plugged into the mounting plate, the upper ends of the support rods extend into the cavity, and a slider located in the cavity is connected to the top of the support rods, and the slider is in contact with the bottom wall of the cavity.

[0009] By adopting the above technical solution, the sliding block cooperates with the support rod, so that the connecting groove body and the mounting plate are slidably matched.

[0010] Optionally, the inner bottom walls of the two connecting grooves are gradually inclined upward in a direction of approaching each other.

[0011] By adopting the above technical solution, the corresponding parts of the frame and the connecting groove body can enter the connecting groove body more smoothly.

[0012] Optionally, the driving member includes two driving plates arranged along the length direction of the base frame, the mounting plate is located between the two driving plates, and a connecting rod is fixedly connected to the driving plate and slidably inserted in the mounting plate. The number of the connecting rods is consistent with the number of support rods close to the other driving plate, and the connecting rod is fixed to the corresponding support rod close to the other driving plate. A return spring is provided between the mounting plate and the driving plate, and the two ends of the return spring are respectively connected to the mounting plate and the driving plate.

[0013] By adopting the above technical solution, when the frame is pushed in the direction of approaching each other, the frame pushes the driving plate to move in the direction of approaching the mounting plate, and at the same time the driving plate compresses the reset spring, and the driving plate drives the connecting rod, the slider, the support rod and the connecting groove body to move, so that the two connecting groove bodies move in the direction of moving away from each other, thereby moving the connecting groove body in the direction of approaching the frame body; when the operator inserts the fixing pin into the connecting groove body and the frame body, the fixing pin limits the connecting groove body, so that the connecting groove body maintains the current position.

[0014] When the operator pulls out the fixing pin, the reset spring restores its deformation and pushes the drive plate to move, so that the drive plate moves away from the mounting plate. At the same time, the drive plate drives the connecting rod, the slider, the support rod and the connecting groove body to move, so that the two connecting groove bodies move toward each other, and the frame body and the connecting groove body are released from the match; when the reset spring returns to its initial state, the drive plate and the connecting groove body return to their initial positions.

[0015] Optionally, a roller is also mounted on the lower surface of the mounting plate.

[0016] By adopting the above technical solution, the roller supports the mounting plate so that there is space between the mounting plate and the base frame for the connecting groove to move. When the hydraulic cylinder is working, the roller can support the middle part of the mounting plate, reducing the deformation of the mounting plate.

[0017] Optionally, the frame includes vertically arranged side panels, to which are fixedly connected horizontally arranged bottom plate, middle plate and top plate, the bottom plate, middle plate and top plate are arranged in sequence from bottom to top, and both ends of the top plate and the middle plate are provided with limiting plates therebetween, and the limiting plates are fixed to the top plate and the middle plate.

[0018] By adopting the above technical solution, when the frame is working, the mounting plate is inserted between the top plate and the middle plate, the limiting plate limits the mounting plate, thereby reducing the relative movement of the mounting plate and the frame along the length direction of the base frame, and the plate on the top of the base frame is inserted between the bottom plate and the middle plate.

[0019] Optionally, a positioning component for being tightly fixed to the frame is provided on the mounting plate.

[0020] By adopting the above technical solution, the positioning assembly reduces the relative movement between the mounting plate and the frame, thereby making the connection between the mounting plate and the frame more stable.

[0021] Optionally, the positioning assembly includes an abutment plate located above the mounting plate, and guide rails are fixedly connected to the connecting rods corresponding to the abutment plate, and the length direction of the guide rails is arranged along the length direction of the connecting rods, and a side of the guide rails close to the driving plate is gradually bent upwards; A plug-in block is slidably plugged into the guide rail, a limit rod is fixedly connected to the plug-in block, and the limit rod penetrates the upper surface of the mounting plate and is fixed to the abutment plate; A guide rod penetrating the plug-in block is fixedly connected to the bottom cavity wall of the cavity, and a positioning spring is also fixedly connected to the bottom cavity wall of the cavity, and the upper end of the positioning spring is fixed to the plug-in block.

[0022] By adopting the above technical solution, when the frame is installed, the two driving plates move in a direction approaching each other, and at the same time the driving plates drive the corresponding connecting rods and guide rails to move, the positioning springs restore their deformation and push the plug-in block, the limit rod and the abutment plate to move upward until the abutment plate abuts against the frame; when the two driving plates move in a direction away from each other, the driving plates mobilize the corresponding connecting rods and guide rails to move, and the guide rails cause the plug-in block, the limit rod and the abutment plate to move downward, and the positioning springs are compressed while the plug-in block moves downward, and the abutment plate moves downward to release the match between the abutment plate and the frame, and when the driving plate returns to its initial position, the abutment plate returns to its initial position.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: By setting the frame, mounting plate, hydraulic cylinder, connecting trough, fixing pin and driving parts, the efficiency of operators in repairing the walking self-moving tail is improved; By providing a driving plate, a return spring, and a connecting rod, the two connecting slots can be driven to move; By arranging the abutment plate, the limiting rod, the plug-in block, the guide rail, the guide rod and the positioning spring, the connection between the mounting plate and the frame body can be more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram showing the positional relationship between the lifting mechanism and the base frame according to an embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the lifting mechanism structure of an embodiment of the present application.

[0026] Figure 3 It is a cross-sectional view of the lifting mechanism structure of an embodiment of the present application.

[0027] Figure 4 It is a cross-sectional view showing the positional relationship between the connecting rod and the slider according to an embodiment of the present application.

[0028] Figure 5 It is a cross-sectional view of the driving member structure according to an embodiment of the present application.

[0029] Figure 6 It is a schematic diagram of the positioning component structure of an embodiment of the present application.

[0030] Explanation of the accompanying drawings: 1. Base frame; 2. Hydraulic cylinder; 3. Mounting plate; 31. Roller; 32. Cavity; 33. Strip hole; 4. Frame; 41. Side plate; 42. Bottom plate; 43. Middle plate; 44. Top plate; 45. Limit plate; 46. Ball; 5. Connecting assembly; 51. Connecting trough; 52. Support rod; 53. Slider; 54. Driving member; 541. Driving plate; 542. Connecting rod; 543. Reset spring; 55. Fixing pin; 6. Positioning assembly; 61. Abutment plate; 62. Guide rail; 63. Plug-in block; 64. Limit rod; 65. Guide rod; 66. Positioning spring. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6 This application is described in further detail.

[0032] The present application embodiment discloses a step-type self-moving tail lifting mechanism for a belt conveyor. Figure 1 and Figure 2 , installed on the I-shaped base frame 1 at the tail of the walking self-propelled machine, the lifting mechanism includes a hydraulic cylinder 2, the bottom of the cylinder barrel of the hydraulic cylinder 2 is fixedly connected with a rectangular mounting plate 3, the lifting mechanism also includes a frame body 4 for connecting the mounting plate 3 and the base frame 1, two frames 4 form a group, and each mounting plate 3 corresponds to a group of frames 4.

[0033] Reference Figure 2 and Figure 3 The frame 4 includes vertically arranged side panels 41, and a group of two side panels 41 have side walls close to each other to which a bottom panel 42, a middle panel 43 and a top panel 44 are vertically fixedly connected. The bottom panel 42, the middle panel 43 and the top panel 44 are arranged in sequence from bottom to top; both ends of the top panel 44 and the middle panel 43 are provided with a limiting plate 45 located therebetween, and the limiting plate 45 is fixed to the side panels 41, the top panel 44 and the middle panel 43.

[0034] A group of two frames 4 are distributed on both sides of the plate at the top of the base frame 1, and the plate at the top of the base frame 1 is inserted between the middle plate 43 and the bottom plate 42. The lower surface of the middle plate 43 and the upper surface of the bottom plate 42 are rotatably connected with a plurality of ball bearings 46, and the ball bearings 46 roll with the plate at the top of the base frame 1 so that there is a gap between the middle plate 43 and the top surface of the base frame 1; the mounting plate 3 is located above the base frame 1, and a plurality of rollers 31 are installed on the lower surface of the mounting plate 3, and the rollers 31 roll with the plate at the top of the base frame 1, and the mounting plate 3 is clamped between the middle plate 43 and the top plate 44 of the two frames 4, and the limit plate 45, the middle plate 43 and the top plate 44 cooperate to limit the mounting plate 3.

[0035] Reference Figure 3 and Figure 4A connecting assembly 5 for connecting the two frames 4 is also provided between two frames 4 of a group. The connecting assembly 5 includes two connecting grooves 51 arranged under the mounting plate 3. The length direction of the connecting grooves 51 is arranged along the length direction of the base frame 1, and the long sides of the two connecting grooves 51 are open in the direction away from each other; a plurality of vertically arranged support rods 52 are fixedly connected to the connecting grooves 51. In this embodiment, the number of support rods 52 corresponding to each connecting groove 51 is two, and all the support rods 52 are arranged at intervals.

[0036] Reference Figure 3 and Figure 5 A cavity 32 is provided in the mounting plate 3, and a strip hole 33 is provided on the lower surface of the mounting plate 3 for the support rod 52 to slide. The strip hole 33 is connected to the cavity 32, and the length direction of the strip hole 33 is arranged along the width direction of the base frame 1. Each support rod 52 is slidably inserted in the strip hole 33; the upper end of the support rod 52 is fixedly connected to a slider 53 located in the cavity 32, and the slider 53, the support rod 52 and the strip hole 33 cooperate to enable the connecting groove body 51 to slide along the width direction of the base frame 1.

[0037] The connecting assembly 5 also includes a driving member 54 for driving the two connecting grooves 51 to move. The driving member 54 includes two driving plates 541 arranged along the length direction of the base frame 1. The mounting plate 3 is located between the two driving plates 541, and the height of the driving plate 541 is less than the distance between the two surfaces of the middle plate 43 and the top plate 44 that are close to each other; each slider 53 is fixedly connected to a connecting rod 542, and the connecting rod 542 passes through the corresponding side wall of the mounting plate 3, and the end of the connecting rod 542 away from the slider 53 is fixed to the driving plate 541.

[0038] A return spring 543 is sleeved on the connecting rod 542 and is located between the driving plate 541 and the mounting plate 3. One end of the return spring 543 is fixed to the mounting plate 3, and the other end of the return spring 543 is fixed to the driving plate 541. The connecting component 5 also includes a fixing pin 55. Holes for the fixing pin 55 to pass through are provided on the top plate 44 and the middle plate 43, and a hole for the fixing pin 55 to be inserted is provided on the plate at the top of the connecting groove body 51.

[0039] When installing the hydraulic cylinder 2, the operator places the mounting plate 3 at a predetermined position so that the length direction of the driving plate 541 is consistent with the length direction of the base frame 1, and the roller 31 contacts the base frame 1; then the two frames 4 are aligned so that the groove between the bottom plate 42 and the middle plate 43 of the frame 4 is aligned with the plate at the top of the base frame 1, and then the two frames 4 are pushed toward each other. When the driving plate 541 contacts the corresponding side, as the operator continues to push the frame 4, the frame 4 pushes the driving plate 541 to move toward the mounting plate 3, and at the same time, the driving plate 541 compresses the return spring 543.

[0040] The driving plate 541 drives the connecting rod 542, the slider 53, the support rod 52 and the connecting groove body 51 to move, so that the connecting groove body 51 moves in the direction close to the middle plate 43 until the middle plate 43 is inserted into the connecting groove body 51. In order to enable the middle plate 43 to move more smoothly into the connecting groove body 51, the inner bottom walls of the two connecting groove bodies 51 are gradually tilted upward in the direction of approaching each other; when the frame body 4 moves to the extreme position, the holes on the connecting groove body 51 are aligned with the holes on the middle plate 43 and the top plate 44. At this time, the operator inserts the fixing pin 55 into the holes on the top plate 44, the middle plate 43 and the connecting groove body 51, thereby completing the installation of the two frames 4, the mounting plate 3 and the hydraulic cylinder 2.

[0041] When the frame 4 drives the mounting plate 3 and the base frame 1 to move relative to each other, the roller 31 supports the middle part of the mounting plate 3 to reduce the downward depression of the middle part of the mounting plate 3. The ball 46 on the frame 4 contacts the base frame 1, so the wear mainly occurs on the ball 46, reducing the wear of the mounting plate 3. Therefore, when replacing the worn lifting mechanism, the frequency of disassembly of the mounting plate 3 and the hydraulic cylinder 2 is low, reducing the damage to the hydraulic cylinder 2 when disassembling the hydraulic cylinder 2.

[0042] When it is necessary to replace one of the mounting plates 3 or the hydraulic cylinder 2, the operator finds the corresponding fixing pin 55 and then pulls the fixing pin 55 upwards to release the fixing pin 55 from the frame 4 and the connecting groove 51. At this time, the reset spring 543 restores its deformation and pushes the drive plate 541, the connecting rod 542, the slider 53, the support rod 52 and the connecting groove 51 to reset; the two connecting grooves 51 move away from each other, and the connecting groove 51 is released from the middle plate 43. At this time, the operator can easily remove the frame 4, which is convenient for the operator to replace the new frame 4.

[0043] Reference Figure 5 and Figure 6 In order to make the connection between the mounting plate 3 and the frame 4 more stable and reduce the shaking of the mounting plate 3, the lifting mechanism also includes a positioning assembly 6 that presses the mounting plate 3 against the frame 4; the positioning assembly 6 includes two abutment plates 61 arranged above the mounting plate 3, and the two abutment plates 61 are respectively located under the corresponding top plate 44; an arc-shaped guide rail 62 is fixedly connected to the connecting rod 542 corresponding to the abutment plate 61, and the end of the guide rail 62 close to the corresponding driving plate 541 is gradually inclined and bent; a plug-in block 63 is slidably inserted in each guide rail 62, and a limit rod 64 is fixedly connected to the plug-in block 63, which passes through the upper surface of the mounting plate 3 and is fixed to the abutment plate 61.

[0044] One side of the plug-in block 63 protrudes from the guide rail 62, and the plug-in block 63 protruding from the guide rail 62 is slidably plugged with a guide rod 65 that penetrates the plug-in block 63, and the lower end of the guide rod 65 is fixedly connected to the bottom cavity wall of the cavity 32; a positioning spring 66 located below the plug-in block 63 is sleeved on the guide rod 65, the lower end of the positioning spring 66 is fixed to the bottom cavity wall of the cavity 32, the upper end of the positioning spring 66 is fixed to the plug-in block 63, and the lower end of the positioning spring 66 is fixed to the bottom cavity wall of the cavity 32, and the positioning spring 66 is always in a compressed state.

[0045] When the driving plate 541 is not in contact with the side plate 41, the guide rail 62 is close to the edge of the mounting plate 3, and the plug-in block 63 is located on the lower side of the guide rail 62; during the installation of the hydraulic cylinder 2, when the two driving plates 541 move toward each other, the driving plate 541 drives the corresponding connecting rod 542 and the guide rail 62 to move, and at the same time the guide rod 65 and the limit rod 64 limit the plug-in block 63, so that the plug-in block 63 does not move laterally with the guide rail 62; the higher side of the guide rail 62 moves toward the middle of the mounting plate 3, and during this process, the positioning spring 66 recovers its deformation and pushes the plug-in block 63 to move upward, and the plug-in block 63 drives the limit rod 64 and the abutment plate 61 to move.

[0046] When the abutment plate 61 contacts the corresponding top plate 44, as the driving plate 541 continues to move, the abutment plate 61 continues to move upward until it abuts against the top plate 44. At this time, when the frame 4 moves into place, the driving plate 541, the connecting rod 542 and the guide rail 62 stop moving, and the guide rail 62, the guide rod 65, the positioning spring 66 and the limit rod 64 cooperate to keep the abutment plate 61 in contact with the top plate 44, thereby reducing the relative movement between the mounting plate 3 and the frame 4 and making the connection between the mounting plate 3 and the frame 4 more stable.

[0047] When the frame 4 is disassembled, the two driving plates 541 move away from each other, and the driving plate 541 drives the corresponding guide rail 62 to move. At the same time, the guide rail 62 causes the plug-in block 63, the limit rod 64 and the abutment plate 61 to move downward, and the abutment plate 61 is out of contact with the corresponding top plate 44. At the same time, the plug-in block 63 compresses the positioning spring 66; when the driving plate 541 returns to its initial position, the guide rail 62, the plug-in block 63 and the abutment plate 61 also return to their initial positions.

[0048] The implementation principle of the lifting mechanism of the step-type self-moving tail of a belt conveyor in the embodiment of the present application is as follows: when installing the hydraulic cylinder 2, the operator places the mounting plate 3 on the base frame 1, then aligns the two frames 4 with the base frame 1, and pushes the two frames 4 in a direction close to each other, and at the same time, the frames 4 push the driving plate 541, the connecting rod 542 and the guide rail 62 to move, the connecting rod 542 moves to make the connecting groove 51 sleeved on the corresponding middle plate 43, the guide rail 62 moves to make the plug-in block 63 and the abutment plate 61 move upward, and when the frame 4 moves into place, the operator inserts the fixing pin 55 into the corresponding hole; when disassembling the frame 4, the operator pulls out the fixing pin 55, and at this time the reset spring 543 restores the deformation to move the driving plate 541 and the connecting rod 542, thereby restoring the connecting groove 51 and the abutment plate 61 to their initial positions.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lifting mechanism for a belt conveyor with a self-moving tail of a stepping type, mounted on an I-shaped base frame (1) of the self-moving tail, the lifting mechanism comprising a hydraulic cylinder (2), characterized in that: The cylinder barrel of the hydraulic cylinder (2) is connected to a mounting plate (3), and the lifting mechanism further comprises two frames (4), each of which is provided with a groove for clamping the mounting plate (3), and each of the two frames (4) is provided with a groove for inserting a plate on the top of the base frame (1), and balls (46) are rotatably connected to the upper groove wall and the lower groove wall of the grooves of the frames (4) and the base frame (1); The lower surface of the mounting plate (3) is slidably connected with connecting grooves (51) corresponding to the frame (4), the openings of the two connecting grooves (51) are spaced apart from each other, and the portion between the two grooves of the frame (4) can be inserted into the connecting grooves (51). The mounting plate (3) is also provided with a driving member (54) for driving the connecting grooves (51) to move along the width direction of the base frame (1); It also includes a fixing pin (55), and the connecting groove body (51) and the frame body (4) are both provided with a hole for the fixing pin (55) to be inserted.

2. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 1 is characterized in that: The mounting plate (3) is provided with a cavity (32), and the connecting groove body (51) is fixedly connected with a support rod (52), and all the support rods (52) are arranged alternately. The support rods (52) are slidably plugged into the mounting plate (3), and the upper ends of the support rods (52) extend into the cavity (32). The tops of the support rods (52) are connected with a slider (53) located in the cavity (32), and the slider (53) is in contact with the bottom wall of the cavity (32).

3. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 1 is characterized in that: The inner bottom walls of the two connecting groove bodies (51) gradually tilt upwards in a direction approaching each other.

4. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 2 is characterized in that: The driving member (54) comprises two driving plates (541) arranged along the length direction of the base frame (1); the mounting plate (3) is located between the two driving plates (541); a connecting rod (542) is fixedly connected to the driving plate (541) and is slidably inserted in the mounting plate (3); the number of the connecting rods (542) is consistent with the number of supporting rods (52) close to the other driving plate (541); the connecting rod (542) is fixed to the corresponding supporting rod (52) close to the other driving plate (541); a return spring (543) is provided between the mounting plate (3) and the driving plate (541); and two ends of the return spring (543) are respectively connected to the mounting plate (3) and the driving plate (541).

5. A step-type self-moving tail lifting mechanism for a belt conveyor according to any one of claims 1 to 4, characterized in that: A roller (31) is also mounted on the lower surface of the mounting plate (3).

6. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 2, characterized in that: The frame (4) comprises a vertically arranged side plate (41), to which a horizontally arranged bottom plate (42), a middle plate (43) and a top plate (44) are fixedly connected, the bottom plate (42), the middle plate (43) and the top plate (44) being arranged in sequence from bottom to top, and both ends of the top plate (44) and the middle plate (43) are provided with a limiting plate (45) located therebetween, and the limiting plate (45) is fixed to the top plate (44) and the middle plate (43).

7. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 4, characterized in that: The mounting plate (3) is provided with a positioning assembly (6) for being tightly fixed to the frame body (4).

8. The step-type self-moving tail lifting mechanism for a belt conveyor according to claim 7, characterized in that: The positioning assembly (6) comprises an abutment plate (61) located above the mounting plate (3); a guide rail (62) is fixedly connected to each connecting rod (542) corresponding to the abutment plate (61); the length direction of the guide rail (62) is arranged along the length direction of the connecting rod (542); and a side of the guide rail (62) close to the driving plate (541) is gradually bent upwards; A plug-in block (63) is slidably plugged into the guide rail (62), a limit rod (64) is fixedly connected to the plug-in block (63), and the limit rod (64) passes through the upper surface of the mounting plate (3) and is fixed to the abutment plate (61); A guide rod (65) penetrating the plug-in block (63) is fixedly connected to the bottom wall of the cavity (32). A positioning spring (66) is also fixedly connected to the bottom wall of the cavity (32), and the upper end of the positioning spring (66) is fixed to the plug-in block (63).

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