A rear matching machine tail automatically changing the posture of a cylinder

Abstract

The present application relates to a kind of automatically changes the rear matching machine tail of drum pose, belong to belt conveyor technical field;Including main support, front arc edge drum is provided with on main support by front side adjusting mechanism, and rear arc edge drum is provided with by rear side adjusting mechanism;Main support includes lower horizontal frame, upper horizontal frame, middle vertical frame, and the upper and lower ends of middle vertical frame are fixedly connected with the lower end face front end of upper horizontal frame and the upper end face rear end of lower horizontal frame;Front side adjusting mechanism includes vertical front floating frame, and front floating frame is connected with middle vertical frame and lower horizontal frame by ball hinge connecting rod and ball hinge drive cylinder respectively, and rear side adjusting mechanism includes vertical rear floating frame, and rear floating frame is connected with middle vertical frame and upper horizontal frame by ball hinge connecting rod and ball hinge drive cylinder respectively;The problem that current fixed machine tail does not have pose adjustment function is solved.

Description

Technical Field

[0001] This invention belongs to the field of belt conveyor technology, specifically relating to a tail section of a conveyor that automatically changes the position of the rollers. Background Technology

[0002] The tail-mounted continuous belt conveyor is a key piece of equipment in the continuous muck removal system of a tunnel boring machine (TBM). Widely used in tunnel engineering, it offers advantages such as high efficiency and low cost. The tail of the tail-mounted continuous belt conveyor is fixed to the TBM and moves synchronously with it. When the TBM is excavating an arc-shaped tunnel, the tail is in a planar turning state. At this time, the contact state between the belt and the tail roller changes. The tail roller needs to immediately adjust its position to adapt to this change and prevent belt deviation and localized deformation.

[0003] Currently used fixed tail sections lack position adjustment capabilities, requiring guide rollers to prevent the belt from deviating from the drum during turns. This leads to accelerated belt wear and significantly reduces belt lifespan. In conclusion, the current tail section design hinders the development of subsequent continuous belt conveyors. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a rear-mounted tail section that automatically changes the position of the rollers; it solves the problem that the current fixed tail section does not have the position adjustment function.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A tail section for automatically changing the position of rollers includes a main support. A front arc-shaped roller is mounted on the main support via a front adjustment mechanism, and a rear arc-shaped roller is mounted via a rear adjustment mechanism. The main support includes a lower horizontal frame, an upper horizontal frame, and a middle vertical frame. The upper and lower ends of the middle vertical frame are fixedly connected to the front end of the lower end face of the upper horizontal frame and the rear end face of the upper horizontal frame, respectively. The front adjustment mechanism includes a vertical front floating frame located in front of the middle vertical frame and above the lower horizontal frame. The front floating frame is connected to the middle vertical frame via a communication channel. The front floating frame is connected to the lower horizontal frame via a horizontal ball joint connecting rod and a horizontal ball joint drive cylinder. The rear adjustment mechanism includes a vertical rear floating frame, which is located behind the middle vertical frame and below the upper horizontal frame. The rear floating frame is connected to the middle vertical frame via a horizontal ball joint connecting rod and a horizontal ball joint drive cylinder, and the rear floating frame is connected to the upper horizontal frame via a vertical ball joint connecting rod and a vertical ball joint drive cylinder.

[0007] Furthermore, both the lower and upper horizontal frames are horizontally arranged square frame structures, consisting of two horizontally extending crossbeams on the left and right sides and two horizontally extending longitudinal beams on the front and back sides; the middle vertical frame is a vertically arranged H-shaped frame structure, consisting of two vertical columns on the left and right sides and a connecting beam in the middle; the upper ends of the two columns of the middle vertical frame are fixedly connected to the lower front ends of the two crossbeams on the left and right sides of the upper horizontal frame, respectively, and the lower ends of the two columns of the middle vertical frame are fixedly connected to the upper rear ends of the two crossbeams on the left and right sides of the lower horizontal frame, respectively.

[0008] Furthermore, an inclined reinforcing beam is installed between the two horizontal beams on the left and right sides of the lower horizontal frame and the two columns of the middle vertical frame, and an inclined reinforcing beam is installed between the two horizontal beams on the left and right sides of the upper horizontal frame and the two columns of the middle vertical frame.

[0009] Furthermore, the front floating frame is a vertically arranged square frame structure, located in front of the middle vertical frame and above the lower horizontal frame; the front floating frame consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom, with the two columns on the left and right of the front floating frame located in front of the two columns on the left and right of the middle vertical frame, respectively.

[0010] Furthermore, the front arc-edge roller is rotatably connected to the front end of the front floating frame via two roller seats; the lower end of the left column of the front floating frame is connected to the upper end face of the left crossbeam of the lower horizontal frame via a vertical ball joint connecting rod; the lower end of the right column of the front floating frame is connected to the upper end face of the right crossbeam of the lower horizontal frame via a vertical ball joint drive cylinder; the lower end of the right column of the front floating frame is connected to the upper end face of the right crossbeam of the lower horizontal frame via a vertical ball joint drive cylinder; and the middle of the rear end face of the right column of the front floating frame is connected to the front end face of the right column of the middle vertical frame via a ball joint connecting rod arranged horizontally front and rear.

[0011] Furthermore, the rear floating frame is a vertically arranged square frame structure, located behind the middle vertical frame and below the upper horizontal frame; the rear floating frame consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom, with the left and right columns of the rear floating frame located behind the left and right columns of the middle vertical frame, respectively.

[0012] Furthermore, the rear arc-edge roller is rotatably connected to the rear end of the front and rear floating frames via two roller seats; the upper end of the left column of the rear floating frame is connected to the lower end face of the left crossbeam of the upper horizontal frame via a vertical ball joint connecting rod; the upper end of the right column of the rear floating frame is connected to the lower end face of the right crossbeam of the upper horizontal frame via a vertical ball joint drive cylinder; the middle of the front end face of the left column of the rear floating frame is connected to the rear end face of the left column of the middle vertical frame via a ball joint drive cylinder arranged horizontally; and the middle of the front end face of the right column of the rear floating frame is connected to the rear end face of the right column of the middle vertical frame via a ball joint connecting rod arranged horizontally.

[0013] Furthermore, the height of the front arc-edge roller is higher than the height of the rear arc-edge roller; the tape contacts the lower end of the rear arc-edge roller and extends forward, then passes over the front arc-edge roller and extends horizontally backward.

[0014] Furthermore, the ball joint connecting rod includes a hinge support, a flange pin, a ball joint rod, and a ball joint seat; one end of the ball joint rod is provided with a ball head, and the other end is provided with a pin hole, with the ball head end of the ball joint rod rotatably connected to the inside of the ball joint seat; a pin hole is provided on the hinge support, and the end of the ball joint rod with the pin hole is inserted into the hinge support, with the pin hole of the ball joint rod corresponding to the pin hole of the hinge support; a flange pin is inserted into the pin hole of the ball joint rod and the pin hole of the hinge support, and the flange pin is fixedly connected to the hinge support by multiple screws, so that the ball joint rod and the hinge support are rotatably connected.

[0015] Furthermore, the ball joint drive cylinder includes a drive cylinder hinge seat, a ball tail drive cylinder, and a ball joint seat; a ball head is fixedly provided at one end of the bottom of the ball tail drive cylinder, and the ball head at one end of the bottom of the ball tail drive cylinder is rotatably connected to the inside of the ball joint seat, so that the ball tail drive cylinder and the ball joint seat are ball-jointed; one end of the piston rod of the ball tail drive cylinder is hinged to the drive cylinder hinge seat.

[0016] The beneficial effects of this invention compared to the prior art are as follows: 1. This invention provides a tail section that automatically changes the position of the drum, automatically adjusting the position of the drum according to the size of the tunnel rotation radius.

[0017] 2. This invention provides a tailpiece that automatically changes the position of the rollers. According to the running status of the conveyor belt, the front arc-edge roller and the rear arc-edge roller can independently perform multi-directional dynamic position adjustment to ensure that the conveyor belt is running within the normal range.

[0018] 3. The present invention provides a tailpiece for automatically changing the position of the roller. The roller has arc-shaped edges on both sides. When the conveyor belt deviates, the conveyor belt will first come into contact with the arc-shaped edges. Since the linear velocity of the arc-shaped edges is higher than the speed of the conveyor belt, the arc-shaped edges will apply a centripetal thrust to the conveyor belt, preventing the conveyor belt from continuing to deviate and preventing the conveyor belt from suddenly running out of the roller. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a front view of the entire invention; Figure 2 yes Figure 1 CC section view in the middle; Figure 3 yes Figure 2 AA section view in the middle; Figure 4 yes Figure 3 View B in the middle; Figure 5 This is a schematic diagram of the overall model of the present invention; Figure 6 This is a schematic diagram of the ball joint connecting rod; Figure 7 This is a schematic diagram of the ball joint mechanism; Figure 8 This is a structural diagram of a flange pin; Figure 9 This is a schematic diagram of the structure of a ball joint drive cylinder; Figure 10 This is a schematic diagram of the ball tail drive cylinder structure; Figure 11 This is a schematic diagram of the front arc edge roller; Figure 12 This is a schematic diagram of the horizontal attitude adjustment of the present invention; Figure 13 This is a schematic diagram of the facade posture adjustment of the present invention; Figure 14 This is a schematic diagram of the pose changes of the present invention during the tunneling process.

[0020] Among them, 1 is the lower horizontal frame, 2 is the upper horizontal frame, 3 is the middle vertical frame, 4 is the front arc edge roller, 5 is the rear arc edge roller, 6 is the front floating frame, 7 is the rear floating frame, 8 is the roller seat, 9 is the ball joint connecting rod, 10 is the ball joint drive cylinder, 11 is the conveyor belt, 12 is the hinge support, 13 is the ball joint rod, 14 is the ball joint seat, 15 is the flange pin, 16 is the ball tail drive cylinder, and 17 is the drive cylinder hinge seat. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0022] like Figure 1 As shown in Figure 11, the present invention provides a rear-mounted tail section that automatically changes the position of the rollers, including a main support, a front arc-edge roller 4 mounted on the main support via a front adjustment mechanism, and a rear arc-edge roller 5 mounted on the main support via a rear adjustment mechanism.

[0023] The main support structure includes a lower horizontal frame 1, an upper horizontal frame 2, and a middle vertical frame 3. Both the lower horizontal frame 1 and the upper horizontal frame 2 are horizontally arranged square frame structures, composed of two horizontally extending crossbeams (front and back) and two horizontally extending longitudinal beams (front and back). The middle vertical frame 3 is a vertically arranged H-shaped frame structure, composed of two vertical columns (left and right) and a connecting beam in the middle. The upper ends of the two columns of the middle vertical frame 3 are fixedly connected to the lower front ends of the two crossbeams of the upper horizontal frame 2, and the lower ends of the two columns of the middle vertical frame 3 are fixedly connected to the upper rear ends of the two crossbeams of the lower horizontal frame 1. An inclined reinforcing beam is installed between the two crossbeams of the lower horizontal frame 1 and the two columns of the middle vertical frame 3, and an inclined reinforcing beam is installed between the two crossbeams of the upper horizontal frame 2 and the two columns of the middle vertical frame 3.

[0024] The front adjustment mechanism includes a front floating frame 6, two roller seats 8, two ball joint connecting rods 9, and two ball joint drive cylinders 10.

[0025] The rear adjustment mechanism includes a rear floating frame 7, two roller seats 8, two ball joint connecting rods 9, and two ball joint drive cylinders 10.

[0026] All roller seats 8, ball joint connecting rods 9, and ball joint drive cylinders 10 have the same structure.

[0027] The ball joint connecting rod 9 includes a hinge support 12, a flange pin 15, a ball joint rod 13, and a ball joint seat 14. One end of the ball joint rod 13 has a ball head, and the other end has a pin hole. The ball head end of the ball joint rod 13 is rotatably connected to the inside of the ball joint seat 14, so that the ball joint rod 13 and the ball joint seat 14 are spherically hinged. A pin hole is provided on the hinge support 12. The end of the ball joint rod 13 with the pin hole is inserted into the hinge support 12. The pin hole of the ball joint rod 13 corresponds to the pin hole of the hinge support 12. A flange pin 15 is inserted into the pin hole of the ball joint rod 13 and the pin hole of the hinge support 12. The flange pin 15 is fixedly connected to the hinge support 12 by multiple screws, so that the ball joint rod 13 and the hinge support 12 are rotatably connected.

[0028] The ball joint drive cylinder 10 includes a drive cylinder hinge seat 17, a ball tail drive cylinder 16, and a ball joint seat 14. A ball head is fixedly disposed at one end of the bottom of the ball tail drive cylinder 16, and the ball head at one end of the bottom of the ball tail drive cylinder 16 is rotatably connected to the inside of the ball joint seat 14, so that the ball tail drive cylinder 16 and the ball joint seat 14 are ball-jointed. One end of the piston rod of the ball tail drive cylinder 16 is hinged to the drive cylinder hinge seat 17.

[0029] The front floating frame 6 is a vertically arranged square frame structure, located in front of the central vertical frame 3 and above the lower horizontal frame 1. The front floating frame 6 consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom. The two columns of the front floating frame 6 are located in front of the two columns on the left and right of the central vertical frame 3, respectively.

[0030] Two roller seats 8 are fixed to the front ends of the left and right columns of the front floating frame 6 respectively. The two roller seats 8 are at the same height. The two ends of the front arc-edge roller 4 are rotatably connected to the two roller seats 8, so that the front arc-edge roller 4 can rotate horizontally left and right at the front end of the front floating frame 6.

[0031] The lower end of the left column of the front floating frame 6 is connected to the upper end of the left crossbeam of the lower horizontal frame 1 via a vertical ball joint connecting rod 9. The hinge support 12 of the ball joint connecting rod 9 is fixedly connected to the lower end of the left column of the front floating frame 6, and the ball joint seat 14 of the ball joint connecting rod 9 is fixedly connected to the upper end of the left crossbeam of the lower horizontal frame 1. The pin hole axis of the hinge support 12 is set horizontally along the front and back. The lower end of the right column of the front floating frame 6 is connected to the upper end of the right crossbeam of the lower horizontal frame 1 via a vertical ball joint drive cylinder 10. The ball joint seat 14 of the ball joint drive cylinder 10 is fixedly connected to the upper end of the right crossbeam of the lower horizontal frame 1, and the drive cylinder hinge seat 17 of the ball joint drive cylinder 10 is fixedly connected to the lower end of the right column of the front floating frame 6. The pin hole axis of the drive cylinder hinge seat 17 is set horizontally along the left and right. The left rear end face of the front floating frame 6 is connected to the front end face of the left column of the central vertical frame 3 via a horizontally arranged ball joint drive cylinder 10. The ball joint seat 14 of the ball joint drive cylinder 10 is fixedly connected to the front end face of the left column of the central vertical frame 3, and the drive cylinder hinge seat 17 of the ball joint drive cylinder 10 is fixedly connected to the rear end face of the left column of the front floating frame 6. The pin hole axis of the drive cylinder hinge seat 17 is horizontally arranged. The right rear end face of the front floating frame 6 is connected to the front end face of the right column of the central vertical frame 3 via a horizontally arranged ball joint connecting rod 9. The hinge support 12 of the ball joint connecting rod 9 is fixedly connected to the rear end face of the right column of the front floating frame 6, and the ball joint seat 14 of the ball joint connecting rod 9 is fixedly connected to the front end face of the right column of the central vertical frame 3. The pin hole axis of the hinge support 12 is vertically arranged.

[0032] The rear floating frame 7 is a vertically arranged square frame structure, located behind the central vertical frame 3 and below the upper horizontal frame 2. The rear floating frame 7 consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom. The two columns of the rear floating frame 7 are located behind the two columns on the left and right of the central vertical frame 3, respectively.

[0033] Two roller seats 8 are fixed to the rear ends of the left and right columns of the rear floating frame 7 respectively. The two roller seats 8 are at the same height. The two ends of the rear arc-edge roller 5 are rotatably connected to the two roller seats 8, so that the rear arc-edge roller 5 can rotate horizontally left and right at the rear end of the rear floating frame 7.

[0034] The upper end of the left column of the rear floating frame 7 is connected to the lower end of the left crossbeam of the upper horizontal frame 2 via a vertical ball joint connecting rod 9. The ball joint seat 14 of the ball joint connecting rod 9 is fixedly connected to the lower end of the left crossbeam of the upper horizontal frame 2. The hinge support 12 of the ball joint connecting rod 9 is fixedly connected to the upper end of the left column of the rear floating frame 7. The pin hole axis of the hinge support 12 is set horizontally along the front and rear. The upper end of the right column of the rear floating frame 7 is connected to the lower end of the right crossbeam of the upper horizontal frame 2 via a vertical ball joint drive cylinder 10. The drive cylinder hinge seat 17 of the ball joint drive cylinder 10 is fixedly connected to the upper end of the right column of the rear floating frame 7. The ball joint seat 14 of the ball joint drive cylinder 10 is fixedly connected to the lower end of the right crossbeam of the upper horizontal frame 2. The pin hole axis of the drive cylinder hinge seat 17 is set horizontally along the front and rear. The left column of the rear floating frame 7 is connected to the rear end of the left column of the central vertical frame 3 via a horizontally arranged ball joint drive cylinder 10. The ball joint seat 14 of the ball joint drive cylinder 10 is fixedly connected to the rear end of the left column of the central vertical frame 3, and the drive cylinder hinge seat 17 of the ball joint drive cylinder 10 is fixedly connected to the front end of the left column of the rear floating frame 7. The pin hole axis of the drive cylinder hinge seat 17 is horizontally arranged from left to right. The right column of the rear floating frame 7 is connected to the rear end of the right column of the central vertical frame 3 via a horizontally arranged ball joint connecting rod 9. The ball joint seat 14 of the ball joint connecting rod 9 is fixedly connected to the rear end of the right column of the central vertical frame 3, and the hinge support 12 of the ball joint connecting rod 9 is fixedly connected to the front end of the right column of the rear floating frame 7. The pin hole axis of the hinge support 12 remains vertical.

[0035] The height of the front arc-edge roller 4 is higher than the height of the rear arc-edge roller 5. The tape 11 contacts the lower end of the rear arc-edge roller 5 and extends forward, then passes over the front arc-edge roller 4 and extends horizontally backward.

[0036] The front arc-edge roller 4 and the rear arc-edge roller 5 are provided with arc-shaped edges on both sides. When the tape 11 deviates, the tape 11 will first come into contact with the arc-shaped edge. Since the linear velocity of the arc-shaped edge is higher than the speed of the tape 11, the arc-shaped edge will apply a centripetal thrust to the tape 11 to prevent the tape 11 from continuing to deviate and to prevent the tape 11 from suddenly running out of the roller.

[0037] The working principle of this invention is as follows: When the tunnel boring machine (TBM) is excavating an arc-shaped tunnel, the rear-mounted tail section of the continuous belt conveyor enters an arc-shaped turning state. At this time, the conveyor belt 11 tends to slip inward. When the conveyor belt 11 slips, it triggers the misalignment sensor at the rear-mounted tail section of the belt conveyor, and simultaneously, the conveyor belt 11 slips to the arc edge position of the arc-shaped roller at the tail section of this invention. The conveying system sends a misalignment signal to the rear-mounted tail section of this invention. Based on the misalignment direction of the conveyor belt 11, the tail section of this invention begins to dynamically adjust the planar and vertical orientation of the roller.

[0038] The tail section of this invention uses four ball joint drive cylinders 10, including two ball joint drive cylinders 10 for horizontal orientation adjustment and two ball joint drive cylinders 10 for vertical orientation adjustment. Through the interaction of the four ball joint drive cylinders 10, the conveyor belt 11 is adjusted to the normal operating position.

[0039] The specific sequence of pose adjustments is as follows: Step 1: As Figure 12 As shown, the horizontal position of the curved edge roller is adjusted by a certain amount to ensure good contact between the tape 11 and the roller, so that the curved edge roller generates a centripetal thrust on the tape 11. Specifically, the adjustment involves extending or retracting the ball joint drive cylinder 10 between the front floating frame 6 or the rear floating frame 7 and the central vertical frame 3. This causes the front curved edge roller 4 or the rear curved edge roller 5 to rotate along with the ball joint connecting rod 9 on the other side, thereby achieving horizontal position adjustment of the front floating frame 6 or the rear floating frame 7.

[0040] Step 2: As Figure 13 As shown, the vertical orientation of the curved edge roller is adjusted by a certain amount to increase the contact pressure between the tape 11 and the roller. This contact pressure increases the friction between the roller and the tape 11. This friction is used to overcome the centripetal force generated by the tension of the tape 11 when the tape 11 turns in the plane. Specifically, the adjustment measures are to extend or retract the ball joint drive cylinder 10 between the lower horizontal frame 1 and the front floating frame 6, causing the front curved edge roller 4 to rotate with the ball joint connecting rod 9 on the other side; or to extend or retract the ball joint drive cylinder 10 between the upper horizontal frame 2 and the rear floating frame 7, causing the rear curved edge roller 5 to rotate with the ball joint connecting rod 9 on the other side, thereby achieving the vertical orientation adjustment of the front floating frame 6 or the rear floating frame 7.

[0041] Step 3: Check if tape 11 is operating within the normal range. If it is normal, stop adjusting; otherwise, continue adjusting. If tape 11 is found to be deviating to the other side, it indicates that the adjustment has been excessive. Perform a correction, first adjusting the horizontal position, then adjusting the vertical position, with the correction amount being 1 / 3 of the original adjustment amount.

[0042] Step 4: Repeat the above steps until tape 11 is within the normal operating range.

[0043] like Figure 14 As shown, by adaptively adjusting the running status of the conveyor belt 11, it can automatically adapt to tunneling operations with different turning radii.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rear mating machine tail that automatically changes the pose of a drum, characterized by: The system includes a main support frame, on which a front arc-shaped roller (4) is mounted via a front adjustment mechanism, and a rear arc-shaped roller (5) is mounted via a rear adjustment mechanism. The main support frame includes a lower horizontal frame (1), an upper horizontal frame (2), and a middle vertical frame (3). The upper and lower ends of the middle vertical frame (3) are fixedly connected to the front end of the lower end face of the upper horizontal frame (2) and the rear end face of the upper end face of the lower horizontal frame (1), respectively. The front adjustment mechanism includes a vertical front floating frame (6), which is located in front of the middle vertical frame (3) and above the lower horizontal frame (1). The front floating frame (6) and the middle vertical frame (3) are connected by a horizontal ball joint connecting rod (9). A horizontal ball joint drive cylinder (10) is connected to the front floating frame (6) and the lower horizontal frame (1) are connected by a vertical ball joint connecting rod (9) and a vertical ball joint drive cylinder (10); the rear adjustment mechanism includes a vertical rear floating frame (7), which is located behind the middle vertical frame (3) and below the upper horizontal frame (2). The rear floating frame (7) is connected to the middle vertical frame (3) by a horizontal ball joint connecting rod (9) and a horizontal ball joint drive cylinder (10), and the rear floating frame (7) is connected to the upper horizontal frame (2) by a vertical ball joint connecting rod (9) and a vertical ball joint drive cylinder (10); The front arc edge roller (4) is rotatably connected to the front end of the front floating frame (6) via two roller seats (8); The rear arc edge roller (5) is rotatably connected to the rear end of the rear floating frame (7) through two roller seats (8); The ball joint connecting rod (9) includes a hinge support (12), a flange pin (15), a ball joint rod (13), and a ball joint seat (14); one end of the ball joint rod (13) is provided with a ball head, and the other end is provided with a pin hole. The ball head end of the ball joint rod (13) is rotatably connected to the inside of the ball joint seat (14); a pin hole is provided on the hinge support (12), and the end of the ball joint rod (13) with the pin hole is inserted into the inside of the hinge support (12). The pin hole of the ball joint rod (13) corresponds to the pin hole of the hinge support (12). A flange pin (15) is inserted into the pin hole of the ball joint rod (13) and the pin hole of the hinge support (12). The flange pin (15) is fixedly connected to the hinge support (12) by multiple screws, so that the ball joint rod (13) and the hinge support (12) are rotatably connected. The ball joint drive cylinder (10) includes a drive cylinder hinge seat (17), a ball tail drive cylinder (16), and a ball joint seat (14); a ball head is fixedly provided at one end of the bottom of the ball tail drive cylinder (16), and the ball head at one end of the bottom of the ball tail drive cylinder (16) is rotatably connected to the inside of the ball joint seat (14), so that the ball tail drive cylinder (16) and the ball joint seat (14) are ball jointed; one end of the piston rod of the ball tail drive cylinder (16) is hinged to the drive cylinder hinge seat (17); The lower horizontal frame (1) and the upper horizontal frame (2) are both horizontally arranged square frame structures, consisting of two horizontal beams extending forward and backward and two longitudinal beams extending left and right; the middle vertical frame (3) is a vertically arranged H-shaped frame structure, consisting of two vertical columns on the left and right and a connecting beam in the middle; the upper ends of the two columns of the middle vertical frame (3) are fixedly connected to the lower front ends of the two horizontal beams of the upper horizontal frame (2), and the lower ends of the two columns of the middle vertical frame (3) are fixedly connected to the upper rear ends of the two horizontal beams of the lower horizontal frame (1). An inclined reinforcing beam is provided between the two horizontal beams on the left and right sides of the lower horizontal frame (1) and the two columns of the middle vertical frame (3). An inclined reinforcing beam is provided between the two horizontal beams on the left and right sides of the upper horizontal frame (2) and the two columns of the middle vertical frame (3). The height of the front arc-edge roller (4) is higher than the height of the rear arc-edge roller (5).

2. The rear-mounted machine tail assembly for automatically changing the position of the drum according to claim 1, characterized in that: The front floating frame (6) is a vertically set square frame structure located in front of the middle vertical frame (3) and above the lower horizontal frame (1). The front floating frame (6) consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom. The two columns on the left and right of the front floating frame (6) are located in front of the two columns on the left and right of the middle vertical frame (3).

3. The rear-mounted machine tail assembly for automatically changing the position of the drum according to claim 2, characterized in that: The lower end of the left column of the front floating frame (6) is connected to the upper end of the left crossbeam of the lower horizontal frame (1) through a vertical ball joint connecting rod (9). The lower end of the right column of the front floating frame (6) is connected to the upper end of the right crossbeam of the lower horizontal frame (1) through a vertical ball joint drive cylinder (10). The middle of the rear end face of the right column of the front floating frame (6) is connected to the front end face of the right column of the middle vertical frame (3) through a ball joint connecting rod (9) set horizontally in front and back.

4. The rear-mounted machine tail assembly for automatically changing the position of the drum according to claim 1, characterized in that: The rear floating frame (7) is a vertically arranged square frame structure located behind the middle vertical frame (3) and below the upper horizontal frame (2). The rear floating frame (7) consists of two vertical columns on the left and right and two horizontally extending longitudinal beams on the top and bottom. The two columns of the rear floating frame (7) are located behind the two columns on the left and right of the middle vertical frame (3).

5. The rear-mounted machine tail assembly for automatically changing the position of the drum according to claim 4, characterized in that: The upper end of the left column of the rear floating frame (7) is connected to the lower end of the left crossbeam of the upper horizontal frame (2) through a vertical ball joint connecting rod (9). The upper end of the right column of the rear floating frame (7) is connected to the lower end of the right crossbeam of the upper horizontal frame (2) through a vertical ball joint drive cylinder (10). The middle part of the front end face of the left column of the rear floating frame (7) is connected to the rear end face of the left column of the middle vertical frame (3) through a ball joint drive cylinder (10) arranged horizontally in front and back. The middle part of the front end face of the right column of the rear floating frame (7) is connected to the rear end face of the right column of the middle vertical frame (3) through a ball joint connecting rod (9) arranged horizontally in front and back.

6. The rear-mounted machine tail assembly for automatically changing the position of the drum according to claim 1, characterized in that: The tape (11) contacts the lower end of the rear arc edge roller (5) and extends forward, then extends horizontally backward after passing over the front arc edge roller (4).

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