A rotary three-station carrier roller replacement device and method of use

Abstract

This invention discloses a rotary three-position idler replacement device and its usage method, relating to the field of idler disassembly and installation technology; it includes a belt conveyor with a leather conveyor belt, under which multiple sets of idler sets are installed; a parallel guide rail arranged beside the belt conveyor; a moving trolley that moves along the parallel guide rail and is equipped with a position sensor; a transmission structure, one end of which is connected to the moving trolley, and the other end of which is equipped with a rotating bracket; the transmission structure is used to drive the rotating bracket to swing, moving it from the outside of the belt conveyor to the bottom of the leather conveyor belt; the rotating bracket has a rotary motor at its bottom end, and a load-bearing idler set, an idler bearing frame, and a position idler set are installed on top of it, with the load-bearing idler set installed in the middle of the rotating bracket, and the idler bearing frame and position idler set arranged at both ends of the rotating bracket; this invention solves the technical problem of existing technologies requiring multiple installations of idler sets on both sides of the belt conveyor, and the difficulty in replacement and installation.

Description

Technical Field

[0001] This invention relates to the field of idler roller disassembly and installation technology, and in particular to a rotary three-station idler roller replacement device and its usage method. Background Technology

[0002] Belt conveyors are the core equipment for transporting materials in mines. Idler rollers, as their main load-bearing components, are numerous and prone to wear, requiring regular replacement.

[0003] Most existing idler roller replacement technologies require manual replacement after the conveyor is stopped. For long-distance conveyors, this results in long downtime and significant economic losses.

[0004] Meanwhile, manual replacement requires personnel to enter under the belt and move the idler rollers in a narrow space, which poses safety hazards such as mechanical entanglement and injury from falling heavy objects.

[0005] Existing technologies also include idler roller replacement equipment, such as CN202610306753.8, which describes a belt conveyor idler roller assembly and replacement method with quick idler roller replacement. The assembly includes an outer support, an inner support, and idlers. The outer support is fixed to the frame. The inner support includes an idler roller main seat, a tilting idler roller seat, and a support seat. The idler roller main seat is slidably disposed within the outer support and detachably connected to it. The idler roller main seat is a multi-segment hinged foldable structure, with an idler roller installed in its middle. The tilting idler roller seat includes two sets, symmetrically disposed at both ends of the idler roller main seat. One end of each set of tilting idler roller seats is hinged to the idler roller main seat, and the other end extends and is equipped with an idler roller. The support seat includes two sets, respectively disposed at opposite ends of the two sets of tilting idler roller seats. One end of each support seat is hinged to the corresponding tilting idler roller seat, and the other end is detachably connected to the idler roller main seat.

[0006] However, on the one hand, the use of bent idler sets to support the transport at the bottom of the leather conveyor belt can easily cause the idler sets to fall off due to high-frequency vibration, resulting in high-frequency damage to the idler sets; on the other hand, disassembly and assembly require the removal of all bolts on both sides and then pulling it out from one side; installation also requires first inserting it and then fixing it from both sides. Therefore, if it is a single worker, it is necessary to frequently change the direction of installation.

[0007] To overcome the above problems, the present invention proposes a rotary three-position idler roller changing device and its usage method. Summary of the Invention

[0008] To overcome the above shortcomings, the present invention provides a solution to the technical problem that the prior art requires the installation of idler roller groups on both sides of the belt conveyor multiple times, and that replacement and installation are not easy.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A rotary three-station idler roller changing device includes:

[0011] The belt conveyor has a leather conveyor belt at the top; multiple sets of idler rollers are installed under the leather conveyor belt to support it.

[0012] Parallel guide rails are arranged on the side of the belt conveyor, and their axis is parallel to the conveying direction of the belt conveyor.

[0013] The mobile trolley moves along a parallel guide rail, on which position sensors are installed;

[0014] The transmission structure is connected to the moving trolley at one end and a rotating bracket is installed at the other end; the transmission structure is used to drive the rotating bracket to swing from the outside of the belt conveyor to the bottom of the leather conveyor belt.

[0015] The rotating support has a rotating motor at the bottom and is equipped with a load-bearing idler group, an idler support frame, and a position idler group. The load-bearing idler group is installed in the middle of the rotating support, and the idler support frame and the position idler group are arranged at both ends of the rotating support. The idler support frame is used to movably insert the idler group under the leather conveyor belt, and the position idler group is used to replace the idler group under the leather conveyor belt.

[0016] In a further technical solution, the idler assembly includes a bottom support, the bottom of which is a corner plate on which multiple sets of rollers are distributed and installed to support the leather conveyor belt; a support plate is provided on the bottom support, and a connection hole is provided on the support plate.

[0017] In a further technical solution, a traveling rack is provided on the parallel guide rail, and a travel track is provided on the side of the belt conveyor; an installation cavity is opened at the bottom of the mobile trolley, and an installation plate is installed in the installation cavity; a traveling motor is provided on the installation plate, the output end of the traveling motor passes through the installation plate and a traveling gear is installed at the bottom, and the traveling gear meshes with the traveling rack; a T-slot is provided on the side of the mobile trolley facing the belt conveyor, which is adapted to be installed on the travel track.

[0018] In a further technical solution, an opening is provided on one side of the mobile trolley, and a rotating shaft is installed inside the opening. The bottom of the rotating shaft is connected to the mobile trolley through a bearing, and a swing motor is also installed at the bottom of the rotating shaft. The output end of the swing motor is coaxially connected to the rotating shaft for swinging the rotating shaft to rotate.

[0019] The transmission structure includes a main support rod, the end of which is mounted on a rotating shaft, and positioning rings are provided along the rotating shaft. The positioning rings are used to constrain and keep the main support rod mounted on the rotating shaft.

[0020] In a further technical solution, a rotary motor is provided at the end of the main support rod away from the moving trolley, and a second rotary shaft is coaxially mounted on the output end of the rotary motor, with a rotary main board fixedly mounted on the top of the second rotary shaft.

[0021] The rotating main plate is equipped with a central cylinder and two sets of lateral cylinders, which are arranged in parallel with the central cylinder. The top of both the lateral cylinder and the central cylinder is equipped with a connecting angle plate, which is connected to the bottom of the corresponding load-bearing idler group, the idler support frame, and the position idler group, respectively.

[0022] In a further technical solution, both the position idler group and the load-bearing idler group are configured to conform to the shape of the idler group; the idler support frame includes a main plate, on which a position hole is opened and a push cylinder is installed on one side, the output end of the push cylinder passes through the position hole and is equipped with a push plate; a rod is provided on the side of the push plate away from the push cylinder, and the rod is adapted to the connection hole.

[0023] In a further technical solution, guide plates are provided on both sides of the main plate, and guide grooves are provided in the guide plates; shorting posts are provided at both ends of the push plate, and the shorting posts are adapted to slide into the guide grooves.

[0024] In a further technical solution, the length of the rotating main plate is less than the length of the adjacent idler roller group; a slewing bearing is provided in the middle of the rotating main plate, the bottom of the outer ring of the slewing bearing is fixedly connected to the rotating shaft, and a center plate is fixedly installed on the inner ring of the slewing bearing; the center cylinder is installed on the center plate, and the initial height of its bottom is higher than the bottom height of the side cylinder.

[0025] In a further technical solution, the mobile trolley is equipped with a fixing plate, and two sets of fixing plates are located on both sides of the opening; a fixing column is installed on the side of the fixing plate facing the main support rod, and a baffle is provided at the head of the fixing column to limit the swing angle limit of the main support rod.

[0026] A method of using a rotary three-station idler roller changing device includes the following steps:

[0027] Step 1, Initial state: The mobile trolley is parked in the standby position on the parallel guide rail, the rotating main rod is perpendicular to the conveying direction of the leather conveyor belt, and the worker is on the periphery of the belt conveyor to install the idler roller group at the pre-installed position.

[0028] Step 2, Moving and Positioning: When any idler roller group is damaged and needs to be replaced, the moving trolley travels along the parallel guide rail to the position. The traveling motor is a worm gear motor. It moves to the designated position and aligns with the faulty idler roller group.

[0029] Step 3, Screw in the bracket: The swing motor operates, driving the main support rod to swing 180°, from the side of the belt conveyor to directly under the leather conveyor belt;

[0030] Step 4, Lifting the belt: Initially, the belt swings with the support rod, allowing the load-bearing idler group to first smoothly lift the leather conveyor belt to the set height, so that the leather conveyor belt is completely separated from the faulty idler group;

[0031] The idler support frame, the load-bearing idler group, and the position idler group are lifted upward by the corresponding side cylinders and center cylinders;

[0032] Step 5, Remove the faulty idler group: While the leather conveyor belt is being smoothly raised to the set height, the insert rod on the idler support frame is inserted into the connection hole of the faulty idler group.

[0033] Step 6, Rotation and Repositioning: The idler support frame and the position idler group rotate 180° around the center of the support idler group to exchange positions. The idler support frame rotates with the rotary motor, and along with the rotating main board, it brings the faulty idler group out of the bottom of the leather conveyor belt; the position idler group is placed into the original position of the faulty idler group, and the fixed position idler group is positioned in the belt conveyor; during this process, the support idler group always maintains support for the leather conveyor belt;

[0034] Step 7, Lowering the leather conveyor belt: The carrying idler group is lowered to the initial height until the leather conveyor belt is connected to the position idler group;

[0035] Step 8: The swing motor drives the main support rod to rotate 180° in the opposite direction and return it to its original position from under the belt of the belt conveyor; the faulty idler group is manually removed to complete the single replacement.

[0036] The present invention has the following beneficial effects:

[0037] This invention utilizes a trolley that moves axially and a swing motor to achieve long-distance swinging of the supporting main rod. This swings the external idler support frame, the supporting idler group, and the positioning idler group together into the lower part of the leather conveyor belt. Upon reaching the swing position, the supporting idler group simultaneously supports the leather conveyor belt, and the idler support frame integrates with the bottom support structure of the faulty idler group. Then, the output rotation direction of the rotary motor is opposite to that of the swing motor, causing the second rotary shaft and the main rotary plate to rotate in opposite directions, thus disengaging the faulty idler group from the belt conveyor. The entire process requires no conveyor shutdown, and the belt remains supported at all times. The removal of old equipment and the loading of new equipment are completed in parallel. Operators do not need to enter hazardous areas throughout the process, making it safe, reliable, and highly efficient. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the rotary three-position idler roller changing device proposed in this invention installed on a belt conveyor (without the idler roller support frame, support idler roller group and position idler roller group installed).

[0039] Figure 2 This is a schematic diagram of the idler roller assembly structure proposed in this invention;

[0040] Figure 3 This invention proposes a rotary three-station idler roller changing device structure. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the back of the rotary three-station idler roller changing device proposed in this invention.

[0042] Figure 5 The structure of the rotary three-station idler roller changing device proposed in this invention. Figure 2 ;

[0043] Figure 6 A top view schematic diagram of the rotary three-position idler roller changing device proposed in this invention installed on a belt conveyor;

[0044] Figure 7 A schematic diagram of the operation of a rotary three-station idler roller changing device;

[0045] Figure 8 This is a schematic diagram of the idler roller support frame structure of the present invention. Figure 1 ;

[0046] Figure 9 This is a schematic diagram of the idler roller support frame structure of the present invention. Figure 2 ;

[0047] legend:

[0048] 1. Belt conveyor; 11. Leather conveyor belt; 12. Idler assembly; 121. Bottom support; 122. Roller; 123. Support plate; 124. Connecting hole; 13. Travel track;

[0049] 2. Parallel guide rail; 21. Traveling rack;

[0050] 3. Mobile trolley; 31. Position sensor; 32. Mounting plate; 33. Travel gear; 34. T-slot; 35. Fixing plate; 36. Baffle; 37. Travel motor;

[0051] 4. Transmission structure; 41. Rotating shaft one; 42. Swing motor; 43. Supporting main rod; 44. Positioning ring;

[0052] 5. Idler roller support frame; 51. Main plate; 52. Push cylinder; 53. Push plate; 54. Insert rod; 55. Guide plate section; 56. Short joint column;

[0053] 6. Load-bearing idler assembly; 7. Positioning idler assembly; 8. Rotating bracket; 81. Rotating motor; 82. Rotating shaft two; 83. Rotating main plate; 84. Center cylinder; 85. Side cylinder; 86. Connecting angle plate; 87. Slewing bearing; 88. Center plate. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0055] Example 1

[0056] like Figure 1-7 The image shows one embodiment of the present invention, specifically a rotary three-station idler roller changing device, comprising:

[0057] like Figure 1 As shown, the belt conveyor 1 has a leather conveyor belt 11 on the upper part; multiple sets of idler rollers 12 are installed under the leather conveyor belt 11 to support the leather conveyor belt 11.

[0058] Parallel guide rail 2 is arranged on the side of belt conveyor 1, and its axis is parallel to the conveying direction of belt conveyor 1.

[0059] The mobile trolley 3 moves along the parallel guide rail 2, on which a position sensor 31 is installed;

[0060] The transmission structure 4 is connected to the moving trolley 3 at one end and a rotating bracket 8 is installed at the other end; the transmission structure 4 is used to drive the rotating bracket 8 to swing from the outside of the belt conveyor 1 to the bottom of the leather conveyor belt 11.

[0061] like Figure 3 As shown, the rotating support 8 has a rotating motor 81 at its bottom end, and a load-bearing idler group 6, an idler support frame 5, and a position idler group 7 are arranged on it. The load-bearing idler group 6 is installed in the middle of the rotating support 8, and the idler support frame 5 and the position idler group 7 are arranged at both ends of the rotating support 8. The idler support frame 5 is used to movably insert the idler group 12 under the leather conveyor belt 11, and the position idler group 7 is used to replace the idler group 12 under the leather conveyor belt 11.

[0062] like Figure 2 As shown, the idler assembly 12 includes a bottom support 121, the bottom of which is a corner plate on which multiple sets of rollers 122 are distributed and installed to support the leather conveyor belt 11; a support plate 123 is provided on the bottom support 121, and a connecting hole 124 is provided on the support plate 123. The bottom support and the belt conveyor should be installed using a method that is easy to disassemble and reassemble.

[0063] like Figure 1As shown, a traveling rack 21 is provided on the parallel guide rail 2, and a travel track 13 is provided on the side of the belt conveyor 1; the bottom of the moving trolley 3 is provided with an installation cavity, and an installation plate 32 is installed in the installation cavity; a traveling motor 37 is provided on the installation plate 32, and the output end of the traveling motor 37 passes through the installation plate 32 and a traveling gear 33 is installed at the bottom, which meshes with the traveling rack 21; a T-slot 34 is provided on the side of the moving trolley 3 facing the belt conveyor 1, which is adapted to be installed on the travel track 13.

[0064] like Figure 4 and 5 As shown, the mobile trolley 3 has an opening on one side, and a rotating shaft 41 is installed inside the opening. The bottom of the rotating shaft 41 is connected to the mobile trolley 3 via a bearing, and a swing motor 42 is also installed at the bottom of the rotating shaft 41. The swing motor is installed inside the housing, and a heat dissipation mesh can be opened on the side of the housing for heat dissipation of the swing motor. Figure 5 Not shown in the diagram. The output end of the swing motor 42 is coaxially connected to the rotating shaft 41, and is used to swing the rotating shaft 41.

[0065] The transmission structure 4 includes a support rod 43, the end of which is mounted on a rotating shaft 41, and a positioning ring 44 is provided along the rotating shaft 41. The positioning ring 44 is used to constrain and keep the support rod 43 mounted on the rotating shaft 41.

[0066] like Figure 3 As shown, a rotary motor 81 is provided at the end of the main support rod 43 away from the moving trolley 3. A rotary shaft 82 is coaxially mounted on the output end of the rotary motor 81. A rotary main plate 83 is fixedly mounted on the top of the rotary shaft 82.

[0067] The rotating main board 83 is equipped with a central cylinder 84 and two sets of lateral cylinders 85, which are arranged in parallel with the central cylinder 84. The top of the lateral cylinders 85 and the central cylinder 84 are equipped with connecting angle plates 86, which are connected to the bottom of the corresponding bearing roller group 6, roller bearing frame 5 and position roller group 7, respectively.

[0068] like Figure 1 As shown, the length of the rotating main board 83 is less than the length of the adjacent idler roller group 12; this ensures that the three-station idler roller replacement device will not interfere with the non-faulty idler roller group during operation, while still enabling the replacement of the faulty idler roller group. Figure 1 The distance between adjacent idler sets under the actual leather conveyor belt can be adjusted according to the actual size to facilitate the replacement of the actual idler sets.

[0069] like Figure 5As shown, a slewing bearing 87 is provided in the middle of the rotating main plate 83. The bottom of the outer ring of the slewing bearing 87 is fixedly connected to the rotating shaft 82, and a center plate 88 is fixedly installed on the inner ring of the slewing bearing 87. The center cylinder 84 is installed on the center plate 88, and its initial bottom height is higher than that of the side cylinder 85. The inner ring of the slewing bearing is supported by the outer ring of the slewing bearing, and the center plate is supported in the middle. The center plate has a T-shaped structure in the axial section, and its bottom is inserted into or fixed to the inner ring of the slewing bearing by bolts.

[0070] like Figure 5 As shown, the right side is an enlarged structural diagram of the dotted line area. The position idler group 7 and the load-bearing idler group 6 are both set in the same shape as the idler group 12. The idler support frame adopts a contoured structure, can be swung and installed on one side of the rotating bracket, and is equipped with claws to connect the faulty idler group.

[0071] like Figure 3 and 5 As shown, the mobile trolley 3 is equipped with a fixing plate 35, and two sets of fixing plates 35 are located on both sides of the opening. A fixing column is installed on the side of the fixing plate 35 facing the main support rod 43. The column head is equipped with a baffle 36 to limit the swing angle limit of the main support rod 43.

[0072] A method of using a rotary three-station idler roller changing device includes the following steps:

[0073] Step 1, Initial state: The mobile trolley 3 is parked in the standby position on the parallel guide rail 2, the rotating main rod is perpendicular to the conveying direction of the leather conveyor belt 11, and the worker is on the periphery of the belt conveyor 1 to install the pre-positioned idler roller group 7.

[0074] When the moving trolley reaches the corresponding position of the faulty idler group, it automatically triggers the rotation of the rotating bracket and subsequent actions; the control system adopts PLC and controls each actuator according to a preset timing sequence, and has the function of precise walking and positioning along the track.

[0075] Step 2, Moving and positioning: When any idler roller group 12 is damaged and needs to be replaced, the moving trolley 3 moves along the parallel guide rail 2 to the position. The traveling motor 37 is a worm gear motor. It moves to the designated position and aligns with the faulty idler roller group.

[0076] Step 3, the bracket is screwed in: the swing motor 42 works, driving the main support rod 43 to swing 180°, from the side of the belt conveyor 1 to directly under the leather conveyor belt 11;

[0077] Step 4, Lifting the belt: Initially, the belt swings with the main support rod 43, so that the bearing idler group 6 first lifts the leather conveyor belt 11 smoothly to the set height, so that the leather conveyor belt 11 is completely separated from the faulty idler group.

[0078] The idler support frame 5, the support idler group 6, and the position idler group 7 are lifted upward by the corresponding side cylinder 85 and center cylinder 84;

[0079] Step 5, remove the faulty idler group: The carrying idler group 6 first lifts the leather conveyor belt 11 smoothly to the set height, while the claws on the idler carrying frame 5 are connected.

[0080] Step 6, Rotation and Repositioning: The idler support frame 5 and the position idler group 7 rotate 180° around the center of the support idler group 6 to exchange positions. The idler support frame 5 rotates with the rotary motor 81, and the rotary main board 83 carries the faulty idler group out of the bottom of the leather conveyor belt 11. The position idler group 7 is lowered by the side cylinder and swings into the original position of the faulty idler group, fixing the position idler group 7 in its position within the belt conveyor 1. During this process, the support idler group 6 always maintains support for the leather conveyor belt 11.

[0081] Step 7, Lowering the leather conveyor belt 11: The carrying idler group 6 is lowered to the initial height until the leather conveyor belt 11 is connected to the position idler group 7; Figure 7 The left side of the image can be a schematic diagram of steps 1 and 2, the middle image can be a schematic diagram of steps 3 and 4, and the right side can be a top view of steps 5-7.

[0082] Step 8: The swing motor 42 drives the support rod 43 to rotate 180° in the opposite direction, returning to its original position. Figure 7 In the left position, return to the original position from under the belt of conveyor 1; manually remove the faulty idler group to complete a single replacement.

[0083] This invention uses a moving trolley that moves axially and a swing motor to swing the main support rod a long distance. This swings the external idler support frame, the support idler group, and the position idler group together into the lower part of the leather conveyor belt. When the swing reaches its position, the support idler group simultaneously supports the leather conveyor belt, and the idler support frame combines with the bottom support structure of the faulty idler group. Then, the output rotation direction of the rotary motor is opposite to that of the swing motor, causing the second rotary shaft and the main rotary plate to rotate in opposite directions, driving the faulty idler group to detach from the belt conveyor.

[0084] Example 2

[0085] like Figure 8 and 9 As shown, another embodiment of the present invention is provided. Based on embodiment 1, the roller support frame 5 includes a main plate 51. The main plate 51 has a position hole and a push cylinder 52 is installed on one side. The output end of the push cylinder 52 passes through the position hole and is equipped with a push plate 53. A rod 54 is provided on the side of the push plate 53 away from the push cylinder 52. The rod 54 is adapted to the connection hole 124.

[0086] The main body plate 51 has guide plate portions 55 on both sides, and guide grooves are formed in the guide plate portions 55; the push plate 53 has shorting posts 56 at both ends, and the shorting posts 56 are adapted to slide into the guide grooves. The insertion rod 54 is inserted into the connection hole 124 of the faulty idler roller group;

[0087] Combination Figure 7 Since the main board rotates along the axis of the rotating shaft, the claws are replaced with a retractable push plate structure to adapt to the insertion connection hole. According to the reverse rotation of the rotating motor, the faulty roller group can be driven to disengage.

[0088] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary three-station idler roller changing device, characterized in that, include: A belt conveyor (1) is provided with a leather conveyor belt (11) on the upper part; multiple sets of idler rollers (12) are installed under the leather conveyor belt (11) to support the leather conveyor belt (11). Parallel guide rails (2) are arranged on the side of the belt conveyor (1), and their axes are parallel to the conveying direction of the belt conveyor (1). The mobile trolley (3) moves along the parallel guide rail (2), on which a position sensor (31) is installed. The transmission structure (4) is connected to the moving trolley (3) at one end and a rotating bracket (8) is installed at the other end; the transmission structure (4) is used to drive the rotating bracket (8) to swing from the outside of the belt conveyor (1) to the bottom of the leather conveyor belt (11); The rotating support (8) has a rotating motor (81) at the bottom, and a bearing idler group (6), an idler support frame (5) and a position idler group (7) are arranged on it. The bearing idler group (6) is installed in the middle of the rotating support (8), and the idler support frame (5) and the position idler group (7) are arranged at both ends of the rotating support (8). The idler support frame (5) is used to insert the idler group (12) under the leather conveyor belt (11), and the position idler group (7) is used to replace the idler group (12) under the leather conveyor belt (11).

2. The rotary three-station idler roller changing device according to claim 1, characterized in that, The idler roller assembly (12) includes a bottom support (121), the bottom of which is a corner plate, on which multiple sets of rollers (122) are distributed and installed to support the leather conveyor belt (11); a support plate (123) is provided on the bottom support (121), and a connection hole (124) is provided on the support plate (123).

3. The rotary three-station idler roller changing device according to claim 2, characterized in that, A traveling rack (21) is provided on the parallel guide rail (2), and a travel track (13) is provided on the side of the belt conveyor (1); the bottom of the mobile trolley (3) is provided with an installation cavity, and an installation plate (32) is installed in the installation cavity; a traveling motor (37) is provided on the installation plate (32), the output end of the traveling motor (37) passes through the installation plate (32) and a traveling gear (33) is installed at the bottom, and the traveling gear (33) meshes with the traveling rack (21); a T-slot (34) is provided on the side of the mobile trolley (3) facing the belt conveyor (1), which is adapted to be installed on the travel track (13).

4. A rotary three-station idler roller changing device according to claim 3, characterized in that, The mobile trolley (3) has an opening on one side, and a rotating shaft (41) is installed inside the opening. The bottom of the rotating shaft (41) is connected to the mobile trolley (3) through a bearing. A swing motor (42) is also installed at the bottom of the rotating shaft (41). The output end of the swing motor (42) is coaxially connected to the rotating shaft (41) for swinging the rotating shaft (41) to rotate. The transmission structure (4) includes a support rod (43), the end of which is mounted on a rotating shaft (41), and a positioning ring (44) is provided above and below the rotating shaft (41). The positioning ring (44) is used to constrain and retain the support rod (43) mounted on the rotating shaft (41).

5. A rotary three-station idler roller changing device according to claim 4, characterized in that, A rotary motor (81) is provided at one end of the main support rod (43) away from the moving trolley (3). A second rotary shaft (82) is coaxially installed at the output end of the rotary motor (81). A rotary main board (83) is fixedly installed on the top of the second rotary shaft (82). The rotating main board (83) is equipped with a central cylinder (84) and two sets of lateral cylinders (85), which are arranged in parallel with the central cylinder (84). The top of the lateral cylinders (85) and the central cylinder (84) are equipped with connecting angle plates (86), which are connected to the bottom of the corresponding bearing idler group (6), idler bearing frame (5) and position idler group (7), respectively.

6. A rotary three-station idler roller changing device according to claim 5, characterized in that, The position roller group (7) and the carrying roller group (6) are both set in the same shape as the roller group (12); the roller carrying frame (5) includes a main plate (51), the main plate (51) has a position hole and a push cylinder (52) is installed on one side, the output end of the push cylinder (52) passes through the position hole and is installed with a push plate (53); the push plate (53) is provided with a plug rod (54) on the side away from the push cylinder (52), and the plug rod (54) is adapted to the connection hole (124).

7. A rotary three-station idler roller changing device according to claim 6, characterized in that, The main plate (51) is provided with guide plate portions (55) on both sides, and guide grooves are provided in the guide plate portions (55); the push plate (53) is provided with shorting posts (56) at both ends, and the shorting posts (56) are adapted to slide in the guide grooves.

8. A rotary three-station idler roller changing device according to claim 7, characterized in that, The length of the rotating main plate (83) is less than the length of the adjacent idler roller group (12); a slewing bearing (87) is provided in the middle of the rotating main plate (83), the bottom of the outer ring of the slewing bearing (87) is fixedly connected to the second rotating shaft (82), and a center plate (88) is fixedly installed on the inner ring of the slewing bearing (87); the center cylinder (84) is installed on the center plate (88), and the initial height of the bottom is higher than the bottom height of the side cylinder (85).

9. A rotary three-station idler roller changing device according to claim 5, characterized in that, The mobile trolley (3) is provided with a fixing plate (35), and two sets of fixing plates (35) are located on both sides of the opening. A fixing column is installed on the side of the fixing plate (35) facing the main support rod (43), and a baffle (36) is provided at the head of the fixing column to limit the swing angle limit of the main support rod (43).

10. A method of using a rotary three-position idler roller changing device, characterized in that, The rotary three-station idler roller changing device according to claim 9 further includes the following steps: Step 1, initial state: The mobile trolley (3) is placed in the standby position on the parallel guide rail (2), the rotating main rod is perpendicular to the conveying direction of the leather conveyor belt (11), and the worker is on the periphery of the belt conveyor (1) to install the roller group (7) at the pre-installed position. Step 2, moving and positioning: When any idler roller group (12) is damaged and needs to be replaced, the moving trolley (3) moves along the parallel guide rail (2) to the position. The moving motor (37) is a worm gear motor. It moves to the designated position and aligns with the faulty idler roller group. Step 3, the bracket is screwed in: the swing motor (42) works, driving the main support rod (43) to swing 180°, from the side of the belt conveyor (1) to directly under the leather conveyor belt (11); Step 4, Lifting the belt: Initially, the belt swings with the support rod (43), so that the bearing idler group (6) first lifts the leather conveyor belt (11) smoothly to the set height, so that the leather conveyor belt (11) is completely separated from the faulty idler group; The idler support frame (5), the support idler group (6), and the position idler group (7) are lifted upward by the corresponding side cylinder (85) and center cylinder (84); Step 5, remove the faulty idler group: First, while the leather conveyor belt (11) is steadily raised to the set height, the insertion rod (54) on the idler support frame (5) is inserted into the connection hole (124) of the faulty idler group. Step 6, Rotation and Repositioning: The idler support frame (5) and the position idler group (7) rotate 180° around the center of the support idler group (6) to exchange positions. The idler support frame (5) rotates with the rotary motor (81) and, along with the rotating main board (83), carries the faulty idler group out of the bottom of the leather conveyor belt (11). The position idler group (7) is placed into the original position of the faulty idler group, and the position idler group (7) is fixed in the position of the belt conveyor (1). During this process, the support idler group (6) always maintains support for the leather conveyor belt (11). Step 7, Lowering the leather conveyor belt (11): The carrying idler group (6) is lowered to the initial height until the leather conveyor belt (11) is connected to the position idler group (7); Step 8: The swing motor (42) drives the support rod (43) to rotate 180° in the opposite direction and return to its original position from under the belt of the belt conveyor (1); the faulty idler group is manually removed to complete the single replacement.

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