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

Abstract

The invention provides a chain tensioning device and method for a dual-drive system of a scraper conveyor. The chain tensioning device comprises a dual-drive machine head and a dual-drive machine tail. The dual-drive machine head comprises a machine head frame, a first chain traction coal mining machine drive part, a first scraper conveyor drive part, a first coal mining machine drive part connecting plate, an L-shaped connecting plate and a first telescopic oil cylinder; the dual-drive machine tail comprises a machine tail frame, a fixing groove, a second chain traction coal mining machine drive part, a second scraper conveyor drive part and a second telescopic oil cylinder. A dual-drive structure is integrated at the machine tail and the machine head, a chain traction coal mining machine drive part and a scraper conveyor drive part are reasonably arranged, and independent tensioning adjustment of a traction chain of the chain traction coal mining machine and a scraper chain of the scraper conveyor is achieved. The chain tensioning device of the dual-drive system of the scraper conveyor is easy and convenient to operate, flexible and reliable, the labor intensity of workers is greatly reduced, the labor amount of the workers is reduced, the long production halt time caused by frequent shutdown chain cutting is avoided, and the production efficiency is improved.

Description

Technical Field

[0001] The 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] When chain-hauled coal mining machines are used in conjunction with scraper conveyors, the chain-hauled coal mining machines usually integrate the traction drive unit into the head and tail of the scraper conveyor, and the scraper conveyor forms a dual-drive system. Due to the differences in working tension, chain specifications, etc. between the coal mining machine traction chain and the scraper chain of the scraper conveyor, the elongation of the chain during use is also different, so the coal mining machine traction chain and the scraper chain cannot be adjusted synchronously. When the working surface is short, the overall elongation of the chain is small, and the chain stacking phenomenon is less, and the chain can be adjusted independently by stopping the machine and cutting the chain. However, when the working surface is long, the overall elongation of the chain increases, and the frequency of chain tension adjustment increases. Using the method of stopping the machine and cutting the chain to adjust the scraper chain of the scraper conveyor and the coal mining machine traction chain under the dual-drive system will increase the downtime and increase the workload of workers, affecting 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, so as to solve the technical problems of long production stoppage time, increased labor 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: 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 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 oil cylinder; one end of the head frame is connected to the first coal mining machine drive unit connecting plate through a fastener, and the first coal mining machine drive unit connecting plate is embedded and connected with the L-shaped connecting plate, and the L-shaped connecting plate can move along the first coal mining machine drive unit connecting plate; the first chain-traction coal mining machine drive unit is connected to the L-shaped connecting plate through a fastener, and the first telescopic oil cylinder is arranged between the head frame and the first chain-traction coal mining machine drive unit, so as to move the first chain-traction coal mining machine drive unit through 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 groove, a second chain-traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic 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 cylinder is arranged between the tail frame and the fixed groove to control the movement of the tail frame through the second telescopic cylinder to achieve the tensioning of the scraper chain; 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.

[0005] 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 inlaid and connected with 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 inlaid and connected with 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.

[0006] 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 can be mechanically fixed according to the first pin hole, the second pin hole and the pin.

[0007] Preferably, the dual-drive machine head further comprises a rotatable guard plate and a retractable lower guard plate, the rotatable guard plate is arranged on the lower chainway of the traction chain at the machine head frame, and the retractable lower guard plate is inlaid on the upper chainway of the traction chain at the machine head frame.

[0008] Preferably, the rotatable guard plate is connected to the lower chainway of the traction chain via a rotating device, the rotating device comprises a rotating shaft and a rotating sleeve, the rotating shaft is round steel, and the rotating sleeve is a steel pipe.

[0009] 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 can be mechanically fixed according to the third pin shaft holes, the fourth pin shaft holes and the pin shafts.

[0010] 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.

[0011] 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: When the traction chain of the chain-traction coal mining machine is tensioned, the first telescopic oil cylinder is started, and the first chain-traction coal mining machine driving part is pushed by the first telescopic oil cylinder; After the traction chain is tensioned, the first chain traction coal mining machine drive unit is fixed and the pressure of the first telescopic cylinder is released.

[0012] Preferably, the scraper chain tensioning process comprises the following steps: When the scraper chain of the scraper conveyor is being tensioned, the second telescopic cylinder is started 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.

[0013] 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.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention integrates a dual-drive structure at the tail and head of the machine, arranges the chain-traction coal mining machine drive part and the scraper conveyor drive part reasonably, and adjusts the chain-traction coal mining machine traction chain without affecting the tension of the scraper conveyor scraper chain by movably installing the chain-traction coal mining machine drive part on the head of the machine. The tail frame is moved by the telescopic oil cylinder between the tail frame and the fixed groove, so as to adjust the tension of the scraper conveyor scraper chain, and the chain-traction coal mining machine drive part is fixed on the fixed groove of the scraper conveyor, so as to adjust the tension of the scraper conveyor scraper chain without affecting the tension of the coal mining machine traction chain. Thus, when the chain-traction coal mining machine and the scraper conveyor are used in conjunction, the chain-traction coal mining machine traction chain and the scraper conveyor scraper chain can be tensioned independently. In addition, the chain tensioning device of the scraper conveyor dual-drive system is simple and convenient to operate, flexible and reliable, greatly reduces the labor intensity of workers, reduces the labor of workers, avoids long production stoppage time due to frequent shutdown and chain cutting, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the dual-drive head of the present invention at a certain angle.

[0016] Figure 2 It is a schematic structural diagram of the dual-drive machine head of the present invention at another angle.

[0017] Figure 3 It is a schematic diagram of the structure of the dual-drive tail of the present invention at a certain angle.

[0018] Figure 4 It is a schematic diagram of the structure of the dual-drive tail of the present invention at another angle.

[0019] Figure 5 It is a cross-sectional view of the dual-drive head of the present invention.

[0020] 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 fixed groove 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

[0021] The technical solutions and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0022] Please also see Figures 1 to 4 A chain tensioning device 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 110, a first chain traction coal mining machine driving unit 120, a first scraper conveyor driving unit 130, a first coal mining machine driving 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 driving unit connecting plate 140 through a fastener, and the first coal mining machine driving 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 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, and a first telescopic cylinder 160 is arranged 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 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.

[0023] 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 inlay structure, and a second telescopic cylinder 250 is arranged between the tail frame 210 and the fixed groove 220, so as to control the movement of the tail frame 210 through the second telescopic cylinder 250 to achieve the tensioning of the scraper chain; 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.

[0024] In the overall structure, the double-drive head and the double-drive tail are respectively placed at the two ends of the working surface, and their extension and retraction are controlled by an independent extension and retraction structure. When the chain-traction coal mining machine traction chain is tensioned, the first extension and retraction cylinder arranged between the head frame and the first chain coal mining machine traction drive part is extended and retracted to move the first chain coal mining machine drive part. When the first chain coal mining machine drive part moves, the L-shaped connecting plate follows the first chain coal mining machine drive part and moves along the connecting plate of the first coal mining machine drive part, thereby achieving the tension adjustment of the chain-traction coal mining machine traction chain. When the first chain coal mining machine drive part moves, the head frame is fixed, so the first scraper conveyor drive part connected to the other end of the head frame is fixed, so that when the traction chain tension adjustment is performed, the tension of the scraper conveyor scraper chain is not affected. When the scraper conveyor scraper chain is tensioned, the second extension and retraction cylinder between the tail frame and the fixed groove is extended and retracted to move the tail frame, thereby adjusting the tension of the scraper conveyor scraper chain. The second chain traction coal mining machine driving part is fixed on the fixed groove. 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 traction chain of the coal mining machine.

[0025] The present invention integrates a dual-drive structure at the tail and head of the machine, arranges the chain-traction coal mining machine drive part and the scraper conveyor drive part reasonably, and adjusts the chain-traction coal mining machine traction chain without affecting the tension of the scraper conveyor scraper chain by movably installing the chain-traction coal mining machine drive part on the head of the machine. The tail frame is moved by the telescopic oil cylinder between the tail frame and the fixed groove, so as to adjust the tension of the scraper conveyor scraper chain, and the chain-traction coal mining machine drive part is fixed on the fixed groove of the scraper conveyor, so as to adjust the tension of the scraper conveyor scraper chain without affecting the tension of the coal mining machine traction chain. Thus, when the chain-traction coal mining machine and the scraper conveyor are used in conjunction, the chain-traction coal mining machine traction chain and the scraper conveyor scraper chain can be tensioned independently. In addition, the chain tensioning device of the scraper conveyor dual-drive system is simple and convenient to operate, flexible and reliable, greatly reduces the labor intensity of workers, reduces the labor of workers, avoids long production stoppage time due to frequent shutdown and chain cutting, and improves production efficiency.

[0026] Furthermore, the tensioning device of the traction chain is designed at the head part, and the tensioning device of the scraper chain is designed at the tail part, rather than being designed at both the head and the tail, which can save space at the head and the tail. At the same time, since the chain-traction coal mining machine moves back and forth on the scraper conveyor, it is necessary to frequently adjust the tension of the traction chain, and the staff mainly work at the head part of the scraper conveyor, so the tensioning device of the chain traction is designed at the head part to facilitate the staff to work. The scraper conveyor is fixed during work, and the frequency of tensioning adjustment of the scraper chain is low, so it is designed at the tail part.

[0027] For further information, 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 and connected with the first L-shaped connecting plate 151, and the upper end of the first chain traction coal mining machine drive unit 120 is connected with 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 and connected with the second L-shaped connecting plate 152, and the lower end of the first chain traction coal mining machine drive unit 120 is connected with the second L-shaped connecting plate 152 through a fastener.

[0028] Specifically, grooves are processed at the upper and lower ends of the first shearer drive unit connecting plate 140. The groove at the upper end of the first shearer drive unit 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 first shearer drive unit connecting plate 140 is used to be embedded and connected with the second L-shaped connecting plate 152. When the first telescopic cylinder is extended and retracted, the first chain traction shearer drive unit 120 is pushed to move, and the first chain traction shearer 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 first shearer drive unit connecting plate 140. Therefore, through the cooperation between the first shearer drive unit connecting plate and the first L-shaped connecting plate and the second L-shaped connecting plate, on the one hand, the first chain traction shearer drive unit and the L-shaped connecting plate are ensured to move along a fixed route, and on the other hand, the first chain traction shearer drive unit is ensured to be stable during the movement process to prevent it from tipping over due to the weight of the first chain traction shearer drive unit.

[0029] Furthermore, a plurality of first pin holes are provided on the bottom plate of the head frame, and a second pin hole 153 is provided on the second L-shaped connecting plate, so that after the traction chain is tensioned, the first chain traction coal mining machine driving part is mechanically fixed according to the first pin hole, the second pin hole and the pin. Specifically, after the traction chain is adjusted and tensioned, in order to ensure that the first chain traction coal mining machine driving part is in a stable position after adjustment, the second pin hole 153 is aligned with a group of the plurality of first pin holes corresponding to the current position, and the pin is inserted for mechanical fixation. After mechanical fixation, the pressure of the first telescopic oil cylinder can be released to ensure the reliable use of the first telescopic oil cylinder.

[0030] For further information, 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, there is a certain distance between the chain barrel and the chain traction coal mining machine driving part during the chain traction process, so the rotatable guard plate at the lower chain path and the retractable lower guard plate at the upper chain path are provided at the machine head to protect the traction chain of the chain traction coal mining machine and avoid leakage. Specifically, during the tensioning process of the traction chain, the first chain traction coal mining machine driving part is pushed out by the first telescopic oil cylinder, and the retractable lower guard plate 180 extends out following the movement of the first chain traction coal mining machine. The rotatable guard plate 170 is turned downward by the gravity of the chain, so that the protection problem of the traction chain can be solved by using the minimum space, avoiding leakage of the traction chain, and thus reducing safety risks.

[0031] For further information, see Figure 5 The rotatable guard plate 170 is connected to the lower chainway 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.

[0032] For further information, see Figure 3 The dual-drive tail also includes a second shearer drive unit coupling plate 260, which is integrated with the fixed groove 220, and the second chain-traction shearer drive unit 230 is connected to the second shearer drive unit coupling plate 260 through a fastener. One end of the second shearer drive unit coupling plate 260 presses the tail frame through a groove to ensure that the tail frame and the fixed groove can slide along a fixed route. In the process of moving the tail frame, one end of the second shearer drive unit coupling plate 260 presses the tail frame through the groove, thereby ensuring the stability of the tail frame during movement. Therefore, in a limited space, the tail end of the machine can not only press the tail frame 210 and determine the moving trajectory of the tail frame 210, but also install the second chain-traction shearer drive unit 230, which greatly saves space at the tail.

[0033] Furthermore, 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 hole, the fourth pin shaft hole and the pin shaft. Specifically, after the scraper chain is adjusted and tensioned, the third pin shaft hole at the current position is aligned with the fourth pin shaft hole, and the pin shaft is inserted for mechanical fixation. After mechanical fixation, the pressure of the second telescopic oil cylinder can be released to ensure the reliable use of the second telescopic oil cylinder, and at the same time ensure that the adjusted tail frame is in a stable position.

[0034] 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: When the traction chain of the chain-traction coal mining machine is tensioned, the first telescopic oil cylinder is started, and the first chain-traction coal mining machine driving part is pushed by the first telescopic oil cylinder; After the traction chain is tensioned, the first chain traction coal mining machine drive unit is fixed and the pressure of the first telescopic cylinder is released.

[0035] When the traction chain of the chain-traction coal mining machine is tensioned, the first telescopic oil cylinder arranged between the head frame and the first chain coal mining machine traction drive unit extends out to push the first chain traction coal mining machine drive unit. When the first chain traction coal mining machine drive unit moves, the L-shaped connecting plate is driven to move along the connecting plate of the first coal mining machine drive unit, thereby achieving the tension adjustment of the traction chain of the chain traction coal mining machine. When the first chain traction coal mining machine drive unit moves, the head frame is fixed, so the first scraper conveyor drive unit connected to the other end of the head frame is fixed, so that when the traction chain tensioning adjustment is performed, the tensioning of the scraper conveyor scraper chain is not affected. During the tensioning process, the traction chain of the coal mining machine is protected by a rotatable guard plate arranged at the lower chain path of the head frame traction chain and a retractable lower guard plate arranged at the upper chain path to prevent it from leaking out. 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 in a saturated state, thereby ensuring its reliable use.

[0036] Further, the scraper chain tensioning process includes the following steps: When the scraper chain of the scraper conveyor is being tensioned, the second telescopic cylinder is started to push the tail frame to move; After the traction chain is tensioned, fix the head frame and release the second telescopic cylinder.

[0037] When the scraper chain of the scraper conveyor is tensioned, the second telescopic oil cylinder between the tail frame and the fixed groove is extended and retracted to move the tail frame, thereby adjusting the tension of the scraper chain of the scraper conveyor. Since the second chain traction shearer drive unit is fixed on the fixed groove, 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. In the process of moving the tail frame, one end of the connecting plate of the second shearer drive unit is used to press the tail frame through the groove, thereby ensuring the stability of the tail frame during movement.

[0038] Furthermore, when the machine is stopped, the traction chain remains in a relaxed state and the scraper chain remains in a tensioned state. When the equipment 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 a suitable state, and then the traction system starts.

[0039] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall 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 includes a double-drive head and a double-drive tail; the double-drive head includes a head frame, a first chain-traction 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 oil cylinder; one end of the head frame is connected to the first coal mining machine drive unit connecting plate through a fastener, and the first coal mining machine drive unit connecting plate is embedded and connected with the L-shaped connecting plate, and the L-shaped connecting plate can move along the first coal mining machine drive unit connecting plate; the first chain-traction coal mining machine drive unit is connected to the L-shaped connecting plate through a fastener, and the first telescopic oil cylinder is arranged between the head frame and the first chain-traction coal mining machine drive unit, so as to move the first chain-traction coal mining machine drive unit through 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 groove, a second chain-traction coal mining machine drive unit, a second scraper conveyor drive unit, and a second telescopic 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 cylinder is arranged between the tail frame and the fixed groove to control the movement of the tail frame through the second telescopic cylinder to achieve the tensioning of the scraper chain; 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 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 inlaid and connected with 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 inlaid and connected with 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 is 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 can be 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 chainway of the traction chain at the machine head frame, and the retractable lower guard plate is inlaid on the upper chainway 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 is characterized in that: The rotatable guard plate is connected to the lower chainway 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 a scraper conveyor according to any one of claims 1 to 5, characterized in that: The dual-drive tail also includes a second coal mining machine drive unit connecting plate, the second coal mining machine drive unit connecting plate and the fixing groove are integrally arranged, and the second chain-traction coal mining machine drive unit is connected to the second coal mining machine 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 as claimed in any one of claims 1 to 7, characterized in that: It includes a traction chain tensioning process and a scraper chain tensioning process; the traction chain tensioning process includes the following steps: When the traction chain of the chain-traction coal mining machine is tensioned, the first telescopic oil cylinder is started, and the first chain-traction coal mining machine driving part is pushed by the first telescopic oil cylinder; After the traction chain is tensioned, the first chain traction coal mining machine drive unit is fixed and the pressure of the first telescopic cylinder is released.

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 comprises the following steps: When the scraper chain of the scraper conveyor is being tensioned, the second telescopic cylinder is started 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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