Chain tensioning device and method for scraper conveyor dual-drive system

Abstract

Provided in the present invention are a chain tensioning device and method for a scraper conveyor dual-drive system. The chain tensioning device comprises a dual-drive head and a dual-drive tail, wherein the dual-drive head comprises a head frame, a first chain-hauled shearer driving portion, a first scraper conveyor driving portion, a first shearer driving portion coupling plate, an L-shaped coupling plate, and a first telescopic oil cylinder; and the dual-drive tail comprises a tail frame, a fixing recess, a second chain-hauled shearer driving portion, a second scraper conveyor driving portion, and a second telescopic oil cylinder. By integrating a dual-drive structure on the tail and the head, the chain-hauled shearer driving portion and the scraper conveyor driving portion are rationally arranged, thereby achieving separate tensioning adjustments of a haulage chain of a chain-hauled shearer and a scraper chain of a scraper conveyor. Moreover, the chain tensioning device for a scraper conveyor dual-drive system of the present invention is simple and convenient to operate, is flexible and reliable, greatly reduces the labor intensity of workers, reduces the workload of workers, and avoids a long downtime due to frequent shutdowns and chain cutting, thereby improving the production efficiency.

Description

Chain tensioning device and method for dual drive system of scraper conveyor Technical Field

[0001] This invention relates to the field of coal mine machinery and equipment technology, specifically to a chain tensioning device and method for a dual-drive system of a scraper conveyor. Background Technology

[0002] In the use of chain-driven coal mining machines in conjunction with scraper conveyors, the traction drive unit of the chain-driven coal mining machine is typically integrated into the head and tail of the scraper conveyor, forming a dual-drive system. Due to differences in working tension and chain specifications between the coal mining machine's traction chain and the scraper conveyor's scraper chain, their elongation rates differ during operation, preventing synchronous adjustment. When the working face is short, the overall chain elongation is small, and chain stacking is minimal, allowing for independent chain adjustment via chain cutting during machine downtime. However, when the working face is long, the overall chain elongation increases, requiring more frequent chain tension adjustments. Using chain cutting during downtime to adjust the scraper conveyor's scraper chain and the coal mining machine's traction chain in this dual-drive system would increase downtime and worker workload, negatively impacting production efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a chain tensioning device and method for a dual-drive system of a scraper conveyor, to solve the technical problems of long downtime, increased labor load and low production efficiency that occur when tensioning the chain of a dual-drive system by stopping the machine to cut the chain.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A chain tensioning device for a dual-drive system of a scraper conveyor includes a dual-drive head and a dual-drive tail. The dual-drive head includes a head frame, a first chain-traction coal mining machine drive unit, a first scraper conveyor drive unit, a connecting plate for the first coal mining machine drive unit, an L-shaped connecting plate, and a first telescopic hydraulic cylinder. One end of the head frame is connected to the connecting plate for the first coal mining machine drive unit via fasteners. The connecting plate for the first coal mining machine drive unit is embedded in and connected to the L-shaped connecting plate, and the L-shaped connecting plate is movable along the connecting plate for the first coal mining machine drive unit. The first chain-traction coal mining machine drive unit is connected to the L-shaped connecting plate via fasteners. The first telescopic hydraulic cylinder is provided between the head frame and the first chain-traction coal mining machine drive unit to achieve chain tensioning by moving the first chain-traction coal mining machine drive unit via the first telescopic hydraulic cylinder. The other end of the first scraper conveyor drive unit is connected to the head frame.

[0006] The dual-drive tail section includes a tail frame, a fixed groove, a second chain traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic hydraulic cylinder. One side of the tail frame is connected to the second scraper conveyor drive unit. The tail frame and the fixed groove are connected by an inlay structure, and a second telescopic hydraulic cylinder is arranged between the tail frame and the fixed groove to control the movement of the tail frame and achieve scraper chain tensioning. The second chain traction coal mining machine drive unit is connected to the fixed groove to ensure that the traction chain is not affected when the scraper chain is tensioned.

[0007] Preferably, the L-shaped connecting plate includes a first L-shaped connecting plate and a second L-shaped connecting plate; the upper end of the first coal mining machine drive unit connecting plate is embedded and connected to the first L-shaped connecting plate, and the upper end of the first chain-driven coal mining machine drive unit is connected to the first L-shaped connecting plate by fasteners; the lower end of the first coal mining machine drive unit connecting plate is embedded and connected to the second L-shaped connecting plate, and the lower end of the first chain-driven coal mining machine drive unit is connected to the second L-shaped connecting plate by fasteners.

[0008] Preferably, the base plate of the head frame is provided with a plurality of first pin holes, and the second L-shaped connecting plate is provided with a second pin hole, so that after the traction chain is tensioned, the first chain traction coal mining machine drive unit is mechanically fixed according to the first pin holes, the second pin holes and the pin.

[0009] Preferably, the dual-drive head also includes a rotatable guard plate and a retractable lower guard plate. The rotatable guard plate is disposed on the lower track of the traction chain at the head frame, and the retractable lower guard plate is embedded in the upper track of the traction chain at the head frame.

[0010] Preferably, the rotatable guard plate is connected to the lower track of the traction chain via a rotating device, the rotating device comprising a rotating shaft and a rotating sleeve, the rotating shaft being a round steel bar and the rotating sleeve being a steel pipe.

[0011] Preferably, the tail frame is provided with a plurality of third pin holes, and the fixing groove is provided with a plurality of fourth pin holes, so that the tail frame can be mechanically fixed according to the third pin holes, the fourth pin holes and the pins after the scraper chain is tensioned.

[0012] Preferably, the bottom plate of the tail frame is provided with a third pin hole, and the bottom plate of the fixing groove is provided with a fourth pin hole, so that after the scraper chain is tensioned, the third pin hole and the fourth pin hole are aligned and mechanically fixed by the pin.

[0013] A method for tensioning the chain of a scraper conveyor dual-drive system, employing the scraper conveyor dual-drive system chain tensioning device as described above, includes a traction chain tensioning process and a scraper chain tensioning process; the traction chain tensioning process includes the following steps:

[0014] When the chain-driven coal mining machine tensions the chain, the first telescopic cylinder is activated, which in turn drives the first chain-driven coal mining machine drive unit.

[0015] After the traction chain is tensioned, the drive unit of the first chain traction coal mining machine is fixed, and the pressure of the first telescopic cylinder is released.

[0016] Preferably, the scraper chain tensioning process includes the following steps:

[0017] When the scraper chain of the scraper conveyor is tensioned, the second telescopic cylinder is activated to push the tail frame to move.

[0018] After the traction chain is tensioned, fix the machine head frame and release the pressure of the second telescopic cylinder.

[0019] Preferably, when the machine is stopped, the traction chain remains slack and the scraper chain remains taut.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention integrates a dual-drive structure at the tail and head of the machine, rationally arranging the drive units of the chain-driven coal mining machine and the scraper conveyor. By movably mounting the chain-driven coal mining machine drive unit at the head, adjusting the traction chain of the chain-driven coal mining machine does not affect the tension of the scraper conveyor's scraper chain. The tail frame is moved by a telescopic hydraulic cylinder between the tail frame and the fixed groove, thereby adjusting the scraper conveyor's scraper chain tension. The chain-driven coal mining machine drive unit is fixed to the scraper conveyor's fixed groove, ensuring that adjusting the scraper conveyor's scraper chain tension does not affect the coal mining machine's traction chain tension. This allows the chain-driven coal mining machine's traction chain and the scraper conveyor's scraper chain to be independently tensioned when used together. Furthermore, the chain tensioning device of this invention's dual-drive system for scraper conveyors is simple, convenient, flexible, and reliable to operate, significantly reducing worker labor intensity and workload, avoiding long downtime due to frequent chain cutting, and improving production efficiency. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the dual-drive head of the present invention at one angle.

[0023] Figure 2 is a schematic diagram of the dual-drive head of the present invention from another angle.

[0024] Figure 3 is a schematic diagram of the dual-drive tail section of the present invention at one angle.

[0025] Figure 4 is a schematic diagram of the dual-drive tail section of the present invention from another angle.

[0026] Figure 5 is a cross-sectional view of the dual-drive head of the present invention.

[0027] In the figure: The dual-drive head includes a head frame 110, a first chain-driven coal mining machine drive unit 120, a first scraper conveyor drive unit 130, a first coal mining machine drive unit connecting plate 140, a first L-shaped connecting plate 151, a second L-shaped connecting plate 152, a second pin hole 153, a first telescopic cylinder 160, a rotatable guard plate 170, a telescopic lower guard plate 180, a rotating device 190, a tail frame 210, a fixing groove 220, a second chain-driven coal mining machine drive unit 230, a second scraper conveyor drive unit 240, a second telescopic cylinder 250, and a second coal mining machine drive unit connecting plate 260. Detailed Implementation

[0028] The technical solutions and effects of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figures 1 to 4 simultaneously. A chain tensioning device for a dual-drive system of a scraper conveyor includes a dual-drive head and a dual-drive tail. The dual-drive head includes a head frame 110, a first chain-traction coal mining machine drive unit 120, a first scraper conveyor drive unit 130, a first coal mining machine drive unit connecting plate 140, an L-shaped connecting plate, and a first telescopic cylinder 160. One end of the head frame 110 is connected to the first coal mining machine drive unit connecting plate 140 via fasteners. 40 is embedded and connected to the L-shaped connecting plate, which can move along the connecting plate 140 of the first coal mining machine drive unit; the first chain traction coal mining machine drive unit 120 is connected to the L-shaped connecting plate by fasteners; a first telescopic cylinder 160 is provided between the head frame 110 and the first chain traction coal mining machine drive unit 120, so as to move the first chain traction coal mining machine drive unit 120 through the first telescopic cylinder 160 to achieve tensioning of the traction chain; the first scraper conveyor drive unit 130 is connected to the other end of the head frame 110.

[0030] The dual-drive tail section includes a tail frame 210, a fixed groove 220, a second chain traction coal mining machine drive unit 230, a second scraper conveyor drive unit 240, and a second telescopic cylinder 250. One side of the tail frame 210 is connected to the second scraper conveyor drive unit 240. The tail frame 210 and the fixed groove 220 are connected by an inlay structure. The second telescopic cylinder 250 is arranged between the tail frame 210 and the fixed groove 220 to control the movement of the tail frame 210 to achieve scraper chain tensioning. The second chain traction coal mining machine drive unit 230 is connected to the fixed groove 220 to ensure that the traction chain is not affected when the scraper chain is tensioned.

[0031] In the overall structure, the dual-drive head and dual-drive tail are positioned at opposite ends of the working face, and their extension and retraction are controlled by independent telescopic structures. When the chain-driven coal mining machine's traction chain is tensioned, the first telescopic cylinder, located between the head frame and the first chain-driven coal mining machine's traction drive unit, extends and retracts, moving the first chain-driven coal mining machine's drive unit. As the first chain-driven coal mining machine's drive unit moves, the L-shaped connecting plate follows the first chain-driven coal mining machine's drive unit along the connecting plate, thereby achieving tension adjustment of the chain-driven coal mining machine's traction chain. While the first chain-driven coal mining machine's drive unit moves, the head frame remains fixed. Therefore, the first scraper conveyor drive unit connected to the other end of the head frame remains stationary, ensuring that the tension of the scraper conveyor's scraper chain is not affected during traction chain tension adjustment. When the scraper conveyor's scraper chain is tensioned, the tail frame is moved and retracted by the second telescopic cylinder located between the tail frame and the fixed groove, thereby adjusting the scraper conveyor's scraper chain tension. The second chain traction coal mining machine drive unit is fixed on the fixed groove. When the tail frame is pushed to adjust the tension of the scraper conveyor scraper chain, the traction chain does not change, thus not affecting the tension of the coal mining machine traction chain.

[0032] This invention integrates a dual-drive structure at the tail and head of the machine, rationally arranging the drive units of the chain-driven coal mining machine and the scraper conveyor. By movably mounting the chain-driven coal mining machine drive unit at the head, adjusting the traction chain of the chain-driven coal mining machine does not affect the tension of the scraper conveyor's scraper chain. The tail frame is moved by a telescopic hydraulic cylinder between the tail frame and the fixed groove, thereby adjusting the scraper conveyor's scraper chain tension. The chain-driven coal mining machine drive unit is fixed to the scraper conveyor's fixed groove, ensuring that adjusting the scraper conveyor's scraper chain tension does not affect the coal mining machine's traction chain tension. This allows the chain-driven coal mining machine's traction chain and the scraper conveyor's scraper chain to be independently tensioned when used together. Furthermore, the chain tensioning device of this invention's dual-drive system for scraper conveyors is simple, convenient, flexible, and reliable to operate, significantly reducing worker labor intensity and workload, avoiding long downtime due to frequent chain cutting, and improving production efficiency.

[0033] Furthermore, designing the tensioning device for the traction chain at the head of the machine and the tensioning device for the scraper chain at the tail, instead of placing them both at the head or tail, saves space at those locations. Also, because the chain-driven coal mining machine moves back and forth on the scraper conveyor, frequent tension adjustments to the traction chain are required. Since workers primarily operate at the head of the scraper conveyor, placing the chain tensioning device at the head facilitates worker operations. The scraper conveyor, however, remains stationary during operation, and the frequency of scraper chain tension adjustments is low; therefore, placing the tensioning device at the tail is preferable.

[0034] Further, referring to Figure 1, the L-shaped connecting plate includes a first L-shaped connecting plate 151 and a second L-shaped connecting plate 152; the upper end of the first coal mining machine drive unit connecting plate 140 is embedded and connected to the first L-shaped connecting plate 151, and the upper end of the first chain-driven coal mining machine drive unit 120 is connected to the first L-shaped connecting plate 151 by fasteners; the lower end of the first coal mining machine drive unit connecting plate 140 is embedded and connected to the second L-shaped connecting plate 152, and the lower end of the first chain-driven coal mining machine drive unit 120 is connected to the second L-shaped connecting plate 152 by fasteners.

[0035] Specifically, the upper and lower ends of the connecting plate 140 of the first coal mining machine drive unit are machined with grooves. The groove at the upper end of the connecting plate 140 is used to be embedded and connected with the first L-shaped connecting plate 151, and the groove at the lower end of the connecting plate 140 is used to be embedded and connected with the second L-shaped connecting plate 152. When the first telescopic cylinder extends or retracts, it pushes the first chain-traction coal mining machine drive unit 120 to move. The first chain-traction coal mining machine drive unit 120 drives the first L-shaped connecting plate 151 and the second L-shaped connecting plate 152 to move along the grooves at the upper and lower ends of the connecting plate 140. Thus, through the cooperation of the connecting plate of the first coal mining machine drive unit with the first L-shaped connecting plate and the second L-shaped connecting plate, on the one hand, it ensures that the first chain-traction coal mining machine drive unit and the L-shaped connecting plate move along a fixed route, and on the other hand, it ensures the stability of the first chain-traction coal mining machine drive unit during movement, preventing it from tipping over due to its weight.

[0036] Furthermore, the base plate of the head frame is provided with multiple first pin holes, and the second L-shaped connecting plate is provided with second pin holes 153, so that after the traction chain is tensioned, the drive unit of the first chain traction coal mining machine can be mechanically fixed according to the first pin holes, second pin holes, and pins. Specifically, after the traction chain is adjusted and tensioned, in order to ensure that the drive unit of the first chain traction coal mining machine is in a stable position after adjustment, the second pin hole 153 is aligned with a set of multiple first pin holes corresponding to the current position, and then a pin is inserted for mechanical fixing. After mechanical fixing, the pressure of the first telescopic cylinder can be released, ensuring the reliable use of the first telescopic cylinder.

[0037] Further, referring to Figure 5, the dual-drive head also includes a rotatable guard plate 170 and a retractable lower guard plate 180. The rotatable guard plate 170 is located on the lower track of the traction chain at the head frame, and the retractable lower guard plate 180 is embedded in the upper track of the traction chain at the head frame. Because underground transmission components cannot be exposed, and there is a certain gap between the chain drum and the drive unit of the chain-traction coal mining machine during chain traction, the rotatable guard plate at the lower track and the retractable lower guard plate at the upper track at the head frame provide protection for the traction chain of the chain-traction coal mining machine, preventing leakage. Specifically, during the tensioning process of the traction chain, the first retractable hydraulic cylinder pushes out the drive unit of the first chain-traction coal mining machine, and the retractable lower guard plate 180 extends along with the movement of the first chain-traction coal mining machine. The rotatable guard plate 170 rotates downward under the weight of the chain, thus solving the protection problem of the traction chain with minimal space, preventing leakage of the traction chain, and reducing safety risks.

[0038] Further, please refer to Figure 5. The rotatable guard plate 170 is connected to the lower track of the traction chain through the rotating device 190. The rotating device 190 includes a rotating shaft and a rotating sleeve. The rotating shaft is a round steel bar, and the rotating sleeve is a steel pipe.

[0039] Further, referring to Figure 3, the dual-drive tail section also includes a second coal mining machine drive unit connecting plate 260. The second coal mining machine drive unit connecting plate 260 and the fixed groove 220 are integrated. The second chain-driven coal mining machine drive unit 230 is connected to the second coal mining machine drive unit connecting plate 260 via fasteners. One end of the second coal mining machine drive unit connecting plate 260 presses against the tail frame through a groove, ensuring that the tail frame and the fixed groove can slide along a fixed path. During the movement of the tail frame, one end of the second coal mining machine drive unit connecting plate 260 presses against the tail frame through the groove, thereby ensuring the stability of the tail frame during movement. Therefore, within a limited space, the second coal mining machine drive unit connecting plate 260 at the tail end can both press against the tail frame 210 and determine the movement trajectory of the tail frame 210, and also install the second chain-driven coal mining machine drive unit 230, greatly saving space at the tail end.

[0040] Furthermore, the tailstock is provided with multiple third pin holes, and the fixing groove is provided with multiple fourth pin holes, so that the tailstock can be mechanically fixed according to the third pin holes, fourth pin holes, and pins after the scraper chain is tensioned. Specifically, after the scraper chain is adjusted and tensioned, the third pin hole and fourth pin hole at the current position are aligned, and the pins are inserted for mechanical fixing. After mechanical fixing, the pressure of the second telescopic cylinder can be released, ensuring the reliable use of the second telescopic cylinder, and ensuring that the adjusted tailstock is in a stable position.

[0041] This invention also provides a method for tensioning the chain of a scraper conveyor dual-drive system, employing the scraper conveyor dual-drive system chain tensioning device described above, including a traction chain tensioning process and a scraper chain tensioning process; the traction chain tensioning process includes the following steps:

[0042] When the chain-driven coal mining machine tensions the chain, the first telescopic cylinder is activated, which in turn drives the first chain-driven coal mining machine drive unit.

[0043] After the traction chain is tensioned, the drive unit of the first chain traction coal mining machine is fixed, and the pressure of the first telescopic cylinder is released.

[0044] When the chain-driven coal mining machine's traction chain is tensioned, a first telescopic hydraulic cylinder, positioned between the headframe and the first chain-driven coal mining machine's traction drive unit, extends, pushing the first chain-driven coal mining machine's drive unit. As the first chain-driven coal mining machine's drive unit moves, it causes an L-shaped connecting plate to move along the connecting plate, thus achieving tension adjustment of the chain-driven coal mining machine's traction chain. While the first chain-driven coal mining machine's drive unit moves, the headframe remains fixed. Therefore, the first scraper conveyor drive unit, connected to the other end of the headframe, remains stationary, ensuring that the tension of the scraper conveyor's scraper chain is not affected during traction chain tension adjustment. During the tensioning process, a rotatable guard plate located at the lower chain track of the headframe and a telescopic lower guard plate located at the upper chain track protect the coal mining machine's traction chain, preventing leakage. After the traction chain is adjusted, align the first pin hole on the base plate of the head frame with the second pin hole on the second L-shaped connecting plate, insert the pin for mechanical fixation, thereby fixing the first chain traction coal mining machine drive unit and releasing the pressure of the first telescopic cylinder to prevent the first telescopic cylinder from becoming saturated and ensure its reliable use.

[0045] Furthermore, the scraper chain tensioning process includes the following steps:

[0046] When the scraper chain of the scraper conveyor is tensioned, the second telescopic cylinder is activated to push the tail frame to move.

[0047] After the traction chain is tensioned, fix the machine head frame and release the second telescopic cylinder.

[0048] When the scraper conveyor chain is tensioned, the tailstock is moved by extending and retracting the second telescopic cylinder between the tailstock and the fixed groove, thereby adjusting the tension of the scraper conveyor chain. Since the second chain traction coal mining machine drive unit is fixed to the fixed groove, the traction chain remains unchanged when the tailstock is pushed to adjust the scraper conveyor chain tension, thus not affecting the tension of the coal mining machine traction chain. During the movement of the tailstock, one end of the connecting plate of the second coal mining machine drive unit presses against the tailstock through a groove, ensuring the stability of the tailstock during movement.

[0049] Furthermore, when the machine is stopped, the traction chain remains slack, while the scraper chain remains tensioned. When the equipment starts, the scraper chain automatically adjusts its tension under the control of the tensioning system; upon receiving the start signal, the traction chain tensioning system gradually tensions the traction chain to the appropriate state, and then the traction system starts.

[0050] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A chain tensioning device for a dual-drive system of a scraper conveyor, characterized in that, The system includes a dual-drive head and a dual-drive tail section. The dual-drive head section includes a head frame, a first chain-driven coal mining machine drive unit, a first scraper conveyor drive unit, a first coal mining machine drive unit connecting plate, an L-shaped connecting plate, and a first telescopic hydraulic cylinder. One end of the head frame is connected to the first coal mining machine drive unit connecting plate via fasteners. The first coal mining machine drive unit connecting plate is embedded in the L-shaped connecting plate, and the L-shaped connecting plate is movable along the first coal mining machine drive unit connecting plate. The first chain-driven coal mining machine drive unit is connected to the L-shaped connecting plate via fasteners. The first telescopic hydraulic cylinder is provided between the head frame and the first chain-driven coal mining machine drive unit to move the first chain-driven coal mining machine drive unit and achieve tensioning of the traction chain. The other end of the first scraper conveyor drive unit is connected to the head frame. The dual-drive tail section includes a tail frame, a fixed groove, a second chain traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic hydraulic cylinder. One side of the tail frame is connected to the second scraper conveyor drive unit. The tail frame and the fixed groove are connected by an inlay structure, and a second telescopic hydraulic cylinder is arranged between the tail frame and the fixed groove to control the movement of the tail frame and achieve scraper chain tensioning. The second chain traction coal mining machine drive unit is connected to the fixed groove to ensure that the traction chain is not affected when the scraper chain is tensioned.

2. The chain tensioning device for a dual-drive system of a scraper conveyor according to claim 1, characterized in that, The L-shaped connecting plate includes a first L-shaped connecting plate and a second L-shaped connecting plate; the upper end of the first coal mining machine drive unit connecting plate is embedded and connected to the first L-shaped connecting plate, and the upper end of the first chain-driven coal mining machine drive unit is connected to the first L-shaped connecting plate by fasteners; the lower end of the first coal mining machine drive unit connecting plate is embedded and connected to the second L-shaped connecting plate, and the lower end of the first chain-driven coal mining machine drive unit is connected to the second L-shaped connecting plate by fasteners.

3. The chain tensioning device for a dual-drive system of a scraper conveyor according to claim 2, characterized in that, The base plate of the head frame is provided with multiple first pin holes, and the second L-shaped connecting plate is provided with second pin holes, so that after the traction chain is tensioned, the first chain traction coal mining machine drive unit is mechanically fixed according to the first pin holes, the second pin holes, and the pins.

4. The chain tensioning device for a dual-drive system of a scraper conveyor according to claim 3, characterized in that, The dual-drive head also includes a rotatable guard plate and a retractable lower guard plate. The rotatable guard plate is installed on the lower track of the traction chain at the head frame, and the retractable lower guard plate is embedded in the upper track of the traction chain at the head frame.

5. The chain tensioning device for a dual-drive system of a scraper conveyor according to claim 4, characterized in that, The rotatable guard plate is connected to the lower track of the traction chain via a rotating device. The rotating device includes a rotating shaft and a rotating sleeve. The rotating shaft is made of round steel, and the rotating sleeve is made of steel pipe.

6. The chain tensioning device for a dual-drive system of a scraper conveyor according to any one of claims 1-5, characterized in that, The dual-drive tail section also includes a second coal mining machine drive unit connecting plate, which is integrated with the fixed groove. The second chain-driven coal mining machine drive unit is connected to the second coal mining machine drive unit connecting plate via fasteners.

7. The chain tensioning device for a dual-drive system of a scraper conveyor according to claim 6, characterized in that, The tail frame is provided with multiple third pin holes, and the fixing groove is provided with multiple fourth pin holes, so that the tail frame can be mechanically fixed according to the third pin holes, fourth pin holes and pins after the scraper chain is tensioned.

8. A method for tensioning the chain of a scraper conveyor dual-drive system, comprising the scraper conveyor dual-drive system chain tensioning device as described in any one of claims 1-7, characterized in that, This includes the tensioning process of the traction chain and the tensioning process of the scraper chain; the tensioning process of the traction chain includes the following steps: When the chain-driven coal mining machine tensions the chain, the first telescopic cylinder is activated, which in turn drives the first chain-driven coal mining machine drive unit. After the traction chain is tensioned, the drive unit of the first chain traction coal mining machine is fixed, and the pressure of the first telescopic cylinder is released.

9. The chain tensioning method for a dual-drive system of a scraper conveyor according to claim 8, characterized in that, The scraper chain tensioning process includes the following steps: When the scraper chain of the scraper conveyor is tensioned, the second telescopic cylinder is activated to push the tail frame to move. After the traction chain is tensioned, fix the machine head frame and release the pressure of the second telescopic cylinder.

10. The chain tensioning method for a dual-drive system of a scraper conveyor according to claim 9, characterized in that, When the machine is stopped, the traction chain remains slack and the scraper chain remains taut.

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