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

Abstract

The present invention provides a chain tensioning device and method for a dual-drive system of a scraper conveyor, comprising a dual-drive head and a dual-drive tail. The dual-drive head comprises a head frame, a first chain-drawn 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 cylinder. The dual-drive tail comprises a tail frame, a fixing slot, a second chain-drawn coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic cylinder. By integrating the dual-drive structure at the tail and head, the chain-drawn coal mining machine drive unit and the scraper conveyor drive unit are rationally arranged, enabling independent tensioning and adjustment of the chain-drawn coal mining machine traction chain and the scraper conveyor scraper chain. Furthermore, the chain tensioning device for a dual-drive system of a scraper conveyor of the present invention is simple, convenient, flexible, and reliable to operate, significantly reducing worker labor intensity and workload, avoiding long production downtimes due to frequent machine stoppages and chain cuts, and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine mechanical equipment, and in particular to a chain tensioning device and method for a dual-drive system of a scraper conveyor. Background Art

[0002] In chain-hauled shearers used in conjunction with scraper conveyors, the shearer typically integrates the traction drive into the front and rear ends of the scraper conveyor, creating a dual-drive system. Due to differences in operating tension and chain specifications between the shearer traction chain and the scraper conveyor's scraper chain, the chain elongation differs during use, making it impossible to adjust the shearer traction chain and the scraper chain synchronously. When the working surface is short, the overall chain elongation is small, resulting in less chain stacking, allowing for independent chain adjustment by stopping the machine and cutting the chain. However, when the working surface is long, the overall chain elongation increases, requiring more frequent chain tensioning adjustments. Continuing to use this method to adjust the scraper conveyor and shearer traction chain in a dual-drive system increases downtime and worker workload, 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 production stoppage time, increased worker workload and low production efficiency when the dual-drive system chain is tensioned by stopping the machine and cutting the chain.

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

[0005] A chain tensioning device of a dual-drive system of a scraper conveyor, comprising a dual-drive head and a dual-drive tail; the dual-drive head comprises a head frame, a first chain-traction coal shearer drive unit, a first scraper conveyor drive unit, a first coal shearer drive unit connecting plate, an L-shaped connecting plate, and a first telescopic oil cylinder; one end of the head frame is connected to the first coal shearer drive unit connecting plate by a fastener, and the first coal shearer drive unit connecting plate is embedded and connected to the L-shaped connecting plate, and the L-shaped connecting plate can move along the first coal shearer drive unit connecting plate; the first chain-traction coal shearer drive unit is connected to the L-shaped connecting plate by a fastener, and the first telescopic oil cylinder is provided between the head frame and the first chain-traction coal shearer drive unit to move the first chain-traction coal shearer drive unit by the first telescopic oil cylinder to realize the tensioning of the traction chain; the first scraper conveyor drive unit is connected to the other end of the head frame;

[0006] The dual-drive tail includes a tail frame, a fixed slot, a second chain-traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic oil cylinder; one side of the tail frame is connected to the second scraper conveyor drive unit, the tail frame and the fixed slot are connected by an inlaid structure, and a second telescopic oil cylinder is arranged between the tail frame and the fixed slot to control the movement of the tail frame through the second telescopic oil cylinder to achieve scraper chain tensioning; the second chain-traction coal mining machine drive unit is connected to the fixed slot 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 in the first L-shaped connecting plate, and the upper end of the first chain traction coal mining machine drive unit is connected to the first L-shaped connecting plate through a fastener; the lower end of the first coal mining machine drive unit connecting plate is embedded in the second L-shaped connecting plate, and the lower end of the first chain traction coal mining machine drive unit is connected to the second L-shaped connecting plate through a fastener.

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

[0009] Preferably, the dual-drive machine head further includes a rotatable guard plate and a retractable lower guard plate, the rotatable guard plate is arranged on the lower chain path of the traction chain at the machine head frame, and the retractable lower guard plate is embedded in the upper chain path of the traction chain at the machine head frame.

[0010] Preferably, the rotatable guard plate is connected to the lower chain path of the traction chain through a rotating device, and the rotating device includes a rotating shaft and a rotating sleeve, the rotating shaft is round steel, and the rotating sleeve is a steel pipe.

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

[0012] Preferably, a third pin hole is provided on the bottom plate of the tail frame, and a fourth pin hole is provided on the bottom plate of the fixing groove, 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 chain tensioning method for a dual-drive system of a scraper conveyor, using the chain tensioning device for the dual-drive system of a scraper conveyor 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-traction coal shearer traction chain is tensioned, the first telescopic oil cylinder is started to push the first chain-traction coal shearer driving part through the first telescopic oil cylinder;

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

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

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

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

[0019] Preferably, when the machine is in a stopped state, the traction chain is kept in a relaxed state and the scraper chain is kept in a tensioned state.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention integrates dual drive structures at the tail and head of the machine, rationally arranging the chain-hauled coal shearer drive unit and the scraper conveyor drive unit. By movably mounting the chain-hauled coal shearer drive unit to the head, the chain-hauled coal shearer traction chain can be adjusted without affecting the tension of the scraper conveyor's scraper chain. The tail frame is moved by a telescopic cylinder between the tail frame and the fixed slot to adjust the tension of the scraper conveyor's scraper chain. The chain-hauled coal shearer drive unit is fixed to the fixed slot of the scraper conveyor, allowing the tension of the scraper conveyor's scraper chain to be adjusted without affecting the tension of the coal shearer traction chain. This allows the chain-hauled coal shearer traction chain and the scraper conveyor's scraper chain to be independently tensioned when the chain-hauled coal shearer and scraper conveyor are used together. Furthermore, the chain tensioning device for the scraper conveyor's dual drive system of the present invention is simple, convenient, flexible, and reliable to operate, significantly reducing worker labor intensity and workload, avoiding long production downtimes caused by frequent machine stoppages and chain cuts, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the dual-drive handpiece of the present invention at a certain angle.

[0023] Figure 2 This is a schematic structural diagram of the dual-drive handpiece of the present invention at another angle.

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

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

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

[0027] In the figure: 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, a first L-shaped connecting plate 151, a second L-shaped connecting plate 152, a second pin shaft 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 slot 220, a second chain-traction 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 DESCRIPTION

[0028] The technical solutions and technical effects of the embodiments of the present invention are further elaborated below in conjunction with the accompanying drawings of the present invention.

[0029] Please also see Figures 1 to 4 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 oil cylinder 160; one end of the head frame 110 is connected to the first coal mining machine drive unit connecting plate 140 by a fastener, and the first coal mining machine drive unit connecting plate 140 is connected to the L-shaped The connecting plate is inlaid and connected, and the L-shaped connecting plate can move along the first coal mining machine drive unit connecting plate 140; the first chain traction coal mining machine drive unit 120 is connected to the L-shaped connecting plate by fasteners, and a first telescopic oil cylinder 160 is provided between the head frame 110 and the first chain traction coal mining machine drive unit 120 to move the first chain traction coal mining machine drive unit 120 by the first telescopic oil cylinder 160 to realize the 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 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 inlaid structure, and a 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 through the second telescopic cylinder 250 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, a dual-drive head and tail are positioned at either end of the working surface, their extension and retraction controlled by independent telescopic structures. When the chain-hauled shearer's traction chain is tensioned, a first telescopic cylinder located between the headframe and the first-chain shearer traction drive unit is extended and retracted, moving the first-chain shearer drive unit. As the first-chain shearer drive unit moves, an L-shaped connecting plate follows the first-chain shearer drive unit and moves along the connecting plate, thereby adjusting the tension of the chain-hauled shearer's traction chain. While the first-chain shearer drive unit moves, the headframe remains stationary, keeping the first scraper conveyor drive unit connected to the other end of the headframe stationary. This allows adjustment of the traction chain tension without affecting the scraper conveyor's scraper chain tension. When the scraper conveyor's scraper chain is tensioned, a second telescopic cylinder located between the tailframe and the fixed slot is extended and retracted, moving the tailframe and adjusting the scraper conveyor chain tension. The second chain traction shearer drive unit is fixed on the fixed slot. When the tail frame is pushed to adjust the tension of the scraper chain of the scraper conveyor, the traction chain does not change, thereby not affecting the tension of the shearer traction chain.

[0032] The present invention integrates dual drive structures at the tail and head of the machine, rationally arranging the chain-hauled coal shearer drive unit and the scraper conveyor drive unit. By movably mounting the chain-hauled coal shearer drive unit to the head, the chain-hauled coal shearer traction chain can be adjusted without affecting the tension of the scraper conveyor's scraper chain. The tail frame is moved by a telescopic cylinder between the tail frame and the fixed slot to adjust the tension of the scraper conveyor's scraper chain. The chain-hauled coal shearer drive unit is fixed to the fixed slot of the scraper conveyor, allowing the tension of the scraper conveyor's scraper chain to be adjusted without affecting the tension of the coal shearer traction chain. This allows the chain-hauled coal shearer traction chain and the scraper conveyor's scraper chain to be independently tensioned when the chain-hauled coal shearer and scraper conveyor are used together. Furthermore, the chain tensioning device for the scraper conveyor's dual drive system of the present invention is simple, convenient, flexible, and reliable to operate, significantly reducing worker labor intensity and workload, avoiding long production downtimes caused by frequent machine stoppages and chain cuts, and improving production efficiency.

[0033] Furthermore, the tensioning device for the traction chain is designed at the nose of the machine, and the tensioning device for the scraper chain is designed at the tail of the machine, rather than designing them at both the nose and tail. This saves space at both the nose and tail. At the same time, because the chain-hauled coal mining machine moves back and forth on the scraper conveyor, the tensioning of the traction chain needs to be frequently adjusted. Since workers primarily work at the nose of the scraper conveyor, the tensioning device for the chain-hauled machine is designed at the nose to facilitate their work. Since the scraper conveyor is stationary during operation, the tensioning of the scraper chain requires less frequent adjustment, so it is designed at the tail of the machine.

[0034] Further, see Figure 1The 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 in the first L-shaped connecting plate 151, and the upper end of the first chain traction coal mining machine drive unit 120 is connected to the first L-shaped connecting plate 151 through a fastener; the lower end of the first coal mining machine drive unit connecting plate 140 is embedded in the second L-shaped connecting plate 152, and the lower end of the first chain traction coal mining machine drive unit 120 is connected to the second L-shaped connecting plate 152 through a fastener.

[0035] Specifically, grooves are machined at the upper and lower ends of the first shearer drive unit coupling plate 140. The groove at the upper end of the first shearer drive unit coupling plate 140 is configured to be inserted and connected to the first L-shaped coupling plate 151, while the groove at the lower end of the first shearer drive unit coupling plate 140 is configured to be inserted and connected to the second L-shaped coupling plate 152. When the first telescopic cylinder extends and retracts, it pushes the first chain-hauled shearer drive unit 120 to move. The first chain-hauled shearer drive unit 120 drives the first L-shaped coupling plate 151 and the second L-shaped coupling plate 152 to move along the grooves at the upper and lower ends of the first shearer drive unit coupling plate 140. The cooperation between the first shearer drive unit coupling plate and the first and second L-shaped coupling plates ensures that the first chain-hauled shearer drive unit and the L-shaped coupling plates move along a fixed route and ensures the stability of the first chain-hauled shearer drive unit during movement, preventing it from tipping over due to its weight.

[0036] Furthermore, the headstock's bottom plate is provided with a plurality of first pin holes, and the second L-shaped connecting plate is provided with a second pin hole 153. After the traction chain is tensioned, the first and second pin holes, along with the pin, are used to mechanically secure the first-chain traction shearer drive unit. Specifically, after the traction chain is adjusted and tensioned, to ensure the adjusted first-chain traction shearer drive unit is in a stable position, the second pin hole 153 is aligned with a group of the plurality of first pin holes corresponding to the current position, and then the pin is inserted for mechanical securement. After mechanical securement, the pressure in the first telescopic cylinder can be released, ensuring reliable operation of the first telescopic cylinder.

[0037] Further, see Figure 5The dual-drive machine head also includes a rotatable guard plate 170 and a retractable lower guard plate 180. The rotatable guard plate 170 is arranged on the lower chain path of the traction chain at the machine head frame, and the retractable lower guard plate 180 is embedded in the upper chain path of the traction chain at the machine head frame. Because the transmission parts underground cannot be exposed, during the chain traction process, there is a certain distance between the chain barrel and the chain traction coal mining machine drive part, so the rotatable guard plate at the lower chain path and the retractable lower guard plate at the upper chain path at the machine head are used to protect the traction chain of the chain traction coal mining machine and prevent leakage. Specifically, during the tensioning process of the traction chain, the first chain traction coal mining machine drive part is pushed out by the first telescopic oil cylinder, 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 is rotated downward by the gravity of the chain, so that the protection problem of the traction chain can be solved with the minimum space, and the leakage of the traction chain can be avoided, thereby reducing safety risks.

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

[0039] Further, see Figure 3 The dual-drive tailstock also includes a second shearer drive unit coupling plate 260, which is integrally formed with the fixing slot 220. The second chain-hauled shearer drive unit 230 is connected to the second shearer drive unit coupling plate 260 via fasteners. One end of the second shearer drive unit coupling plate 260 compresses the tailstock through a groove, ensuring that the tailstock and the fixing slot can slide along a fixed path. During tailstock movement, the groove compresses the tailstock through one end of the second shearer drive unit coupling plate 260, thereby ensuring its stability during movement. Therefore, within a limited space, the second shearer drive unit coupling plate 260 at the tailstock can both compress the tailstock 210 and determine its movement trajectory, while also allowing for the installation of the second chain-hauled shearer drive unit 230, significantly saving space at the tailstock.

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

[0041] The present invention also provides a chain tensioning method for a dual-drive system of a scraper conveyor, which uses the chain tensioning device for the dual-drive system of a scraper conveyor as 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-traction coal shearer traction chain is tensioned, the first telescopic oil cylinder is started to push the first chain-traction coal shearer driving part through the first telescopic oil cylinder;

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

[0044] When the chain-hauled coal mining machine's traction chain is tensioned, a first telescopic cylinder positioned between the head frame and the first-chain coal mining machine traction drive unit extends, pushing the first-chain coal mining machine drive unit. As the first-chain coal mining machine drive unit moves, it drives the L-shaped connecting plate along the first coal mining machine drive unit connecting plate, thereby achieving tension adjustment of the chain-hauled coal mining machine's traction chain. While the first-chain coal mining machine drive unit moves, the head frame is stationary, and therefore the first scraper conveyor drive unit connected to the other end of the head frame remains stationary. This allows the tension of the scraper conveyor's scraper chain to be adjusted without affecting it. During the tensioning process, the coal mining machine traction chain is protected from leakage by a rotatable guard plate located at the lower chain path of the head frame traction chain and a retractable lower guard plate located at the upper chain path. After the traction chain is adjusted, align the first pin hole on the head frame bottom plate with the second pin hole on the second L-shaped connecting plate, insert the pin for mechanical fixation, and fix the first chain traction coal mining machine drive unit. At the same time, release the pressure of the first telescopic cylinder to avoid the first telescopic cylinder from being 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 being tensioned, the second telescopic oil cylinder is activated to push the tail frame to move;

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

[0048] When the scraper conveyor chain is tensioned, the second telescopic cylinder between the tailstock and the fixed slot expands and contracts, moving the tailstock and adjusting the chain tension. Because the second-chain shearer drive unit is fixed to the fixed slot, the traction chain remains unchanged when the tailstock is moved to adjust the chain tension, thus unaffecting the shearer chain tension. During tailstock movement, the end of the second shearer drive unit's coupling plate presses against the tailstock through the groove, ensuring stability during movement.

[0049] Furthermore, when the machine is stopped, the traction chain remains relaxed and the scraper chain remains tensioned. When the machine is started, the scraper chain automatically adjusts its tension under the control of the tensioning system. When the traction chain tensioning system receives the start signal, the traction chain is gradually tensioned to the appropriate state, and then the traction system starts.

[0050] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not intended to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made 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: It comprises a dual-drive head and a dual-drive tail; the dual-drive head comprises a head frame, a first chain-traction coal shearer drive unit, a first scraper conveyor drive unit, a first coal shearer drive unit connecting plate, an L-shaped connecting plate, and a first telescopic oil cylinder; one end of the head frame is connected to the first coal shearer drive unit connecting plate by a fastener, and the first coal shearer drive unit connecting plate is embedded in the L-shaped connecting plate, and the L-shaped connecting plate can move along the first coal shearer drive unit connecting plate; the first chain-traction coal shearer drive unit is connected to the L-shaped connecting plate by a fastener, and the first telescopic oil cylinder is provided between the head frame and the first chain-traction coal shearer drive unit to move the first chain-traction coal shearer drive unit by the first telescopic oil cylinder to realize the tensioning of the traction chain; the first scraper conveyor drive unit is connected to the other end of the head frame; The dual-drive tail includes a tail frame, a fixed slot, a second chain-traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic oil cylinder; one side of the tail frame is connected to the second scraper conveyor drive unit, the tail frame and the fixed slot are connected by an inlaid structure, and a second telescopic oil cylinder is arranged between the tail frame and the fixed slot to control the movement of the tail frame through the second telescopic oil cylinder to achieve scraper chain tensioning; the second chain-traction coal mining machine drive unit is connected to the fixed slot to ensure that the traction chain is not affected when the scraper chain is tensioned.

2. The chain tensioning device of the dual drive system of the scraper conveyor according to claim 1 is 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 in the first L-shaped connecting plate, and the upper end of the first chain traction coal mining machine drive unit is connected to the first L-shaped connecting plate through a fastener; the lower end of the first coal mining machine drive unit connecting plate is embedded in the second L-shaped connecting plate, and the lower end of the first chain traction coal mining machine drive unit is connected to the second L-shaped connecting plate through a fastener.

3. The chain tensioning device of the dual drive system of the scraper conveyor according to claim 2, characterized in that: A plurality of first pin holes are provided on the bottom plate of the head frame, and a second pin hole is provided on the second L-shaped connecting plate, so that after the traction chain is tensioned, the first chain traction coal mining machine drive part is mechanically fixed according to the first pin hole, the second pin hole and the pin.

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

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

6. The chain tensioning device of the dual drive system of the scraper conveyor according to any one of claims 1 to 5, characterized in that: The dual-drive tail also includes a second shearer drive unit connecting plate, which is integrated with the fixing slot, and the second chain-traction shearer drive unit is connected to the second shearer drive unit connecting plate via fasteners.

7. The chain tensioning device of the dual drive system of the scraper conveyor according to claim 6, characterized in that: The tail frame is provided with a plurality of third pin shaft holes, and the fixing groove is provided with a plurality of fourth pin shaft holes, so that after the scraper chain is tensioned, the tail frame is mechanically fixed according to the third pin shaft holes, the fourth pin shaft holes and the pin shafts.

8. A chain tensioning method for a dual-drive system of a scraper conveyor, using the chain tensioning device for a dual-drive system of a scraper conveyor according to any one of claims 1 to 7, characterized in that: It includes the traction chain tensioning process and the scraper chain tensioning process; the traction chain tensioning process includes the following steps: When the chain-traction coal shearer traction chain is tensioned, the first telescopic oil cylinder is started to push the first chain-traction coal shearer driving part through the first telescopic oil cylinder; After the traction chain is tensioned, fix the first chain traction coal mining machine drive unit and release the pressure of the first telescopic cylinder.

9. The chain tensioning method of the 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 being tensioned, the second telescopic oil cylinder is activated to push the tail frame to move; After the traction chain is tensioned, fix the head frame and release the pressure of the second telescopic cylinder.

10. The chain tensioning method of the dual-drive system of a scraper conveyor according to claim 9, characterized in that: When the machine is in shutdown state, the traction chain remains in a relaxed state and the scraper chain remains in a tensioned state.

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