Chain tensioning tool and chain tensioning method for scraper conveyor

Abstract

A kind of scraper conveyor chain tightening tool and chain tightening method, wherein the scraper conveyor chain tightening tool includes scraper blocking plate component installed on the tail transition groove middle plate of scraper conveyor, chain blocking wheel component hingedly installed on the tail frame of scraper conveyor, and chain tightening controller, chain tightening controller is electrically connected with the drive part of scraper conveyor and chain blocking wheel component by wire.This application solves the problem that manual clamping mechanism is used in gate disc chain tensioner, which is complicated to operate, has high risk and can only be applied to small power scraper conveyor, and uses intelligent chain tightening control system to realize chain tensioning, braking, chain pinching and chain loosening, automatically completes the chain tightening process, omits the hydraulic chain tensioner and corresponding hydraulic control system prone to failure, and is safe, simple and easy to operate, with high reliability and more safety;The output torque in the chain tightening process is controlled by chain tightening controller, and the chain link is increased or decreased when the chain tension reaches the ideal state, to ensure that the chain is in the best tensioning state after the chain tightening is completed.

Description

Technical Field

[0001] This invention relates to the field of scraper conveyor technology, and in particular to a scraper conveyor chain tightening fixture and chain tightening method. Background Technology

[0002] Scraper conveyors are continuous transport machines that use chains as the traction mechanism, and are currently the only transport equipment in longwall coal mining faces. The chain is an elastic element, and after a period of use, it undergoes elastic deformation, requiring periodic chain tightening to ensure it operates under appropriate tension. Currently, underground scraper conveyors in coal mines widely use disc chain tensioners and hydraulic chain tensioners for chain tightening; however, these methods have the following drawbacks:

[0003] The brake disc chain tensioner uses a manual clamping mechanism when braking, which is cumbersome to operate, highly dangerous, and only suitable for low-power scraper conveyors.

[0004] Hydraulic chain tensioners are generally controlled by a hydraulic control system that controls the forward and reverse rotation of the motor and brakes the motor. The hydraulic control system mainly consists of a ball stop valve, filter, pressure reducing valve, manual directional valve, hydraulic directional valve, shuttle valve, and pressure lock valve. The system is quite complex, including a large number of control valve groups and pipelines. For safety reasons, hydraulic oil is generally not used in underground coal mines; instead, emulsion is used. The main component of emulsion is water, which can corrode the control valve group, causing frequent problems with the hydraulic control system and seriously affecting work efficiency. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned technologies, it is necessary to provide a chain tightening tool for scraper conveyors.

[0006] A chain tensioning fixture for a scraper conveyor includes a scraper-blocking component mounted on a plate in the transition trough at the tail of the scraper conveyor to prevent the scraper from moving, a chain-blocking wheel component hinged to the tail frame of the scraper conveyor to prevent the tail sprocket from rotating, and a chain tensioning controller. The chain tensioning controller is electrically connected to the drive unit of the scraper conveyor and the chain-blocking wheel component via wires.

[0007] Preferably, the scraper component includes a blocking block and a fixing pin. One end of the blocking block is provided with a wedge-shaped end that contacts the scraper. The fixing pin is fixed inside the blocking block, and the lower end of the fixing pin protrudes from the bottom of the blocking block.

[0008] Preferably, a handle is fixed to the top of the blocking block.

[0009] Preferably, the chain wheel component includes a fork, a connecting rod, and a single lug plate. The single lug plate is fixed to one end of the connecting rod. A pin hole is provided on the single lug plate, and a keyway is provided in the pin hole. A pin shaft is inserted into the pin hole, and the single lug plate is connected to the tail frame of the scraper conveyor by a key connection. There are two forks, which are symmetrically arranged on both sides of the connecting rod away from the single lug plate.

[0010] Preferably, the chain wheel component further includes a corner drive assembly, which is connected to a keyed pin hole. The corner drive assembly can drive the chain wheel component to rotate as a whole, so that the end of the fork abuts against the chain on the two sprockets at the tail of the scraper conveyor.

[0011] Preferably, the end of the shift fork away from the connecting rod has an arc-shaped groove.

[0012] It is also necessary to provide a method for tightening the chain of a scraper conveyor.

[0013] A method for tightening the chain of a scraper conveyor includes the following steps:

[0014] (1) Install a scraper assembly on the plate of the transition trough at the tail of the scraper conveyor. Insert the fixing pin on the scraper assembly into the hole on the plate of the transition trough at the tail. Fix the scraper assembly relative to the transition trough at the tail. The wedge end on the scraper assembly faces the scraper. Hinge the chain wheel assembly on the tail frame of the scraper conveyor.

[0015] (2) By controlling the drive unit of the scraper conveyor through the chain tensioner, the drive unit rotates at low speed, driving the tail sprocket of the scraper conveyor to rotate counterclockwise, driving the scraper chain on the upper chain track of the scraper conveyor to move from right to left, causing the inclined surface on the wedge end of the scraper to form an uphill motion, and the distance H between the axe head at both ends of the scraper and the inner surface of the upper edge of the transition groove at the tail of the machine gets closer and closer. When the distance H is zero, the scraper stops moving.

[0016] (3) By controlling the drive unit to rotate at low speed and monitoring the output torque in real time through the chain tensioning controller, the chain between the scraper plate component and the tail sprocket is tensioned. As the output torque of the drive unit increases, the tension of the chain between the scraper plate component and the tail sprocket also increases, and the chain is elastically stretched.

[0017] (4) When the output torque of the drive unit reaches the torque required for proper chain tension, the chain tensioning controller starts to control the rotation of the angle servo motor, driving the chain wheel component to rotate counterclockwise by an angle α. When the fork on the chain wheel component presses against the chain on the two sprockets at the tail of the scraper conveyor, the fork prevents the tail sprocket from rotating clockwise under the elastic tension of the chain. At this time, the chain tensioning controller turns off the power of the drive unit, and the tail sprocket is stationary under the elastic tension of the chain and the action of the chain wheel component. The tensioned chain is in a braking state. At this time, the chain between the scraper component and the chain wheel component is in a slack state, and the chain links can be safely added or removed. Then the chain is connected through the connecting link.

[0018] (5) The chain tensioner controls the rotation angle servo motor to rotate in the opposite direction, driving the chain wheel component to rotate clockwise by an angle α. The chain wheel component returns to its original position, causing the chain wheel component to disengage from the chain.

[0019] (6) Remove the scraper components from the transition trough at the tail of the scraper conveyor and complete the chain tightening work.

[0020] Preferably, in step (4), the rotation angle of the chain wheel component should be less than 60°.

[0021] Preferably, the drive unit is a variable frequency motor.

[0022] As can be seen from the above technical solution, the chain tensioning fixture and method for scraper conveyors provided by this invention solves the problems of the manual clamping mechanism used in the gate disc chain tensioner, which is cumbersome to operate, highly dangerous, and only applicable to low-power scraper conveyors. Furthermore, it employs an intelligent chain tensioning control system to automatically complete the chain tensioning process by achieving chain tensioning, braking, chain clamping, and chain loosening. Compared with the original design, it eliminates the easily malfunctioning hydraulic chain tensioner and its corresponding hydraulic control system, making operation safer, simpler, more reliable, and safer. The scraper component utilizes the inclined surface on the wedge end to continuously lift the moving scraper, causing the scraper to wedge against the inclined surface on the wedge end and the upper edge of the transition groove side at the tail end. The scraper component is simple, lightweight, safe, and reliable, preventing scraper movement. The drive sprocket component, via a fork, engages with the tail sprocket to prevent clockwise rotation under the chain's elastic tension, thus achieving chain tensioning and braking. The drive unit and servo motor are controlled by a chain tensioning controller to complete chain tensioning, braking, adding / removing chain links, and loosening the chain, automatically tightening the chain. By continuously monitoring the drive unit's output torque during tightening, chain links are added or removed when the chain tension reaches the ideal state. After tightening, the chain is in optimal tension, which helps extend chain life and reduce equipment wear. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of the scraper component for the invention.

[0025] Figure 2 For invention Figure 1 A schematic diagram of the left-side view structure.

[0026] Figure 3 For invention Figure 1 A top-view structural diagram.

[0027] Figure 4 A cross-sectional view showing the connection between the scraper component and the end transition groove.

[0028] Figure 5 This is a schematic diagram of the structure of the chain wheel component for the invention.

[0029] Figure 6 For invention Figure 5 A top-view structural diagram.

[0030] Figure 7 This is a schematic diagram of the invention installed on a scraper conveyor.

[0031] Figure 8 For invention Figure 7 A magnified view of a portion of point A in the middle.

[0032] Figure 9 For invention Figure 7 A top-view structural diagram.

[0033] Figure 10 For invention Figure 9 A magnified view of a section at point B.

[0034] Figure 11 This is a view of the end face of the scraper and the transition groove at the tail of the machine.

[0035] Figure 12 This is a control flowchart of the chain tightening method of the present invention.

[0036] In the diagram: scraper component 01, blocking block 11, fixing pin 12, wedge end 13, handle 14, chain wheel component 02, shift fork 21, arc groove 211, connecting rod 22, single ear plate 23, pin hole 24, keyway 25, pin shaft 26, corner drive assembly 27, corner servo motor 271, output shaft 272, scraper 03, chain 04, tail transition groove 05, middle plate 51, tail frame 06. Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0039] Please refer to Figure 1 As shown in Figure 11, this embodiment of the invention provides a chain tensioning fixture for a scraper conveyor, including a scraper baffle component 01 mounted on the plate 51 of the tail transition trough 05 of the scraper conveyor, a chain guide wheel component 02 hinged to the tail frame 06 of the scraper conveyor, and a chain tensioning controller. The chain tensioning controller is electrically connected to the drive unit of the scraper conveyor and the chain guide wheel component 02 via wires. The scraper baffle component 01 prevents the scraper 03 from moving and, in conjunction with the chain tensioning controller, controls the rotation of the chain guide wheel component 02 to prevent the tail sprocket from rotating. This allows the chain 04 between the scraper baffle component 01 and the chain guide wheel component 02 to be in a slack state, enabling safe addition or removal of chain links. The chain 04 is then connected via a connecting link to complete the chain tensioning operation. The drive unit of the scraper conveyor is a variable frequency motor.

[0040] In one embodiment, the scraper component 01 includes a blocking block 11 and a fixing pin 12. One end of the blocking block 11 is provided with a wedge-shaped end 13 that contacts the scraper 03. When the scraper 03 moves counterclockwise, the scraper 03 can be continuously lifted by the inclined surface on the wedge-shaped end 13, so that the scraper 03 is stuck between the inclined surface of the wedge-shaped end 13 and the upper edge of the groove side of the tail transition groove 05, thereby preventing the scraper 03 from moving. The fixing pin 12 is fixed inside the blocking block 11, and the lower end of the fixing pin 12 protrudes from the bottom of the blocking block 11. During installation, the lower end of the fixing pin 12 can be inserted into the middle plate 51 of the tail transition groove 05 of the scraper conveyor, thereby fixing the blocking block 11 and the middle plate 51 of the transition groove relative to each other.

[0041] Specifically, a handle 14 is fixed on the top of the blocking block 11, which can be easily removed from the transition groove plate 51.

[0042] In one embodiment, the chain wheel component 02 includes a fork 21, a connecting rod 22, and a single lug plate 23. The single lug plate 23 is fixed to one end of the connecting rod 22. There are two forks 21, which are symmetrically arranged on both sides of the end of the connecting rod 22 away from the single lug plate 23.

[0043] Specifically, a pin hole 24 is provided on the single ear plate 23, and a keyway 25 is provided in the pin hole 24. The pin shaft 26 is inserted into the pin hole 24, and the single ear plate 23 is connected to the tail frame 06 of the scraper conveyor by key connection.

[0044] In one embodiment, the chain wheel component 02 further includes a corner drive assembly 27, which is keyed to the pin hole 24. The corner drive assembly 27 can drive the chain wheel component 02 to rotate as a whole, so that the end of the fork 21 abuts against the chain 04 located on the two sprockets at the tail of the scraper conveyor.

[0045] The shift fork 21 has an arc-shaped groove 211 at the end away from the connecting rod 22. The shape of the arc-shaped groove 211 is adapted to the arc-shaped structure at the end of the chain link 04, so that the end of the shift fork 21 can firmly hold the chain link to ensure effective restriction of the tail sprocket.

[0046] In one embodiment, the corner drive assembly 27 includes a corner servo motor 271 and an output shaft 272. One end of the output shaft 272 is connected to the corner servo motor 271, and the other end of the output shaft 272 is connected to the key 26 pin.

[0047] Please refer to Figures 1 to 12 This invention provides a method for tightening the chain of a scraper conveyor, comprising the following steps:

[0048] (1) Install a scraper assembly on the plate 51 of the tail transition trough 05 of the scraper conveyor. Insert the fixing pin 12 on the scraper assembly 01 into the hole on the plate 51 of the tail transition trough 05. Fix the scraper assembly 01 relative to the tail transition trough 05. The wedge end 13 on the scraper assembly 01 faces the scraper 03. And hinge the chain wheel assembly 02 on the tail frame 06 of the scraper conveyor.

[0049] (2) By controlling the drive unit of the scraper conveyor through the chain tension controller, the drive unit rotates at low speed, driving the tail sprocket of the scraper conveyor to rotate counterclockwise, driving the scraper chain on the upper chain track of the scraper conveyor to move from right to left, causing the scraper 03 to move uphill along the inclined surface on the wedge end 13. The distance H between the two ends of the scraper 03 and the inner surface of the upper edge of the transition groove 05 at the tail gets closer and closer. When the distance H is zero, the scraper 03 stops moving.

[0050] (3) By continuing to control the low-speed rotation of the drive unit through the chain tensioning controller and monitoring the output torque in real time, the chain 04 between the scraper component 01 and the tail sprocket is tensioned. As the output torque of the drive unit continues to increase, the tension of the chain 04 between the scraper component 01 and the tail sprocket also continues to increase, and the chain 04 is elastically stretched.

[0051] (4) When the output torque of the drive unit reaches the torque required for the appropriate tension of the chain 04, the chain tensioning controller starts to control the rotation of the angle servo motor 271 to rotate, and drives the chain wheel component 02 to rotate counterclockwise by an angle α. The angle of rotation of the chain wheel component 02 should be less than 60°. When the fork 21 on the chain wheel component 02 presses against the chain 04 on the two sprockets at the tail of the scraper conveyor, the fork 21 prevents the tail sprocket from rotating clockwise under the elastic tension of the chain 04. At this time, the chain tensioning controller turns off the power of the drive unit. The tail sprocket is stationary under the elastic tension of the chain 04 and the action of the chain wheel component 02. The tensioned chain 04 is in a braking state. At this time, the chain 04 between the scraper component 01 and the chain wheel component 02 is in a slack state. The chain links can be safely added or removed. Then the chain 04 is connected through the connecting link.

[0052] (5) The chain tensioner controls the rotation angle servo motor 271 to rotate in the opposite direction, driving the chain wheel component 02 to rotate clockwise by an angle α, and the chain wheel component 02 returns to its original position, so that the chain wheel component 02 is disengaged from the chain 04.

[0053] (6) Remove the scraper component 01 from the middle plate 51 of the tail transition trough 05 of the scraper conveyor to complete the chain tightening work.

[0054] 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 fixture for a scraper conveyor, characterized in that: The system includes a scraper component mounted on the transition trough at the tail of the scraper conveyor to prevent scraper movement, a chain wheel component hinged to the tail frame of the scraper conveyor to prevent the tail sprocket from rotating, and a chain tension controller. The chain tension controller is electrically connected to the drive unit of the scraper conveyor and the chain wheel component via wires. The scraper component includes a blocking block and a fixing pin. One end of the blocking block is provided with a wedge-shaped end that contacts the scraper. The fixing pin is fixed inside the blocking block, and the lower end of the fixing pin protrudes from the bottom of the blocking block. A handle is fixed to the top of the blocking block. The chain wheel component includes a fork and a connecting... The system includes a rod and a single lug plate, with the single lug plate fixed to one end of the connecting rod. The single lug plate has a pin hole with a keyway inside. A pin is inserted into the pin hole, and the single lug plate is connected to the tailstock of the scraper conveyor via a key connection. Two shift forks are symmetrically positioned on either side of the connecting rod away from the single lug plate. The chain wheel assembly also includes a corner drive component, which is keyed to the pin hole. The corner drive component drives the chain wheel assembly to rotate, causing the ends of the shift forks to press against the chains on the two sprockets at the tailstock of the scraper conveyor. An arc-shaped groove is provided at the end of the shift fork away from the connecting rod.

2. A method for tightening the chain of a scraper conveyor using the chain tightening fixture of claim 1, characterized in that: Includes the following steps, (1) Install a scraper assembly on the plate of the transition trough at the tail of the scraper conveyor. Insert the fixing pin on the scraper assembly into the hole on the plate of the transition trough at the tail. Fix the scraper assembly relative to the transition trough at the tail. The wedge end on the scraper assembly faces the scraper. Hinge the chain wheel assembly on the tail frame of the scraper conveyor. (2) By controlling the drive unit of the scraper conveyor through the chain tensioner, the drive unit rotates at low speed, driving the tail sprocket of the scraper conveyor to rotate counterclockwise, driving the scraper chain on the upper chain track of the scraper conveyor to move from right to left, causing the inclined surface on the wedge end of the scraper to form an uphill motion, and the distance H between the axe head at both ends of the scraper and the inner surface of the upper edge of the transition groove at the tail of the machine gets closer and closer. When the distance H is zero, the scraper stops moving. (3) By controlling the drive unit to rotate at low speed and monitoring the output torque in real time through the chain tensioning controller, the chain between the scraper plate component and the tail sprocket is tensioned. As the output torque of the drive unit increases, the tension of the chain between the scraper plate component and the tail sprocket also increases, and the chain is elastically stretched. (4) When the output torque of the drive unit reaches the torque required for proper chain tension, the chain tensioning controller starts to control the rotation of the angle servo motor, driving the chain wheel component to rotate counterclockwise by an angle α. When the fork on the chain wheel component presses against the chain on the two sprockets at the tail of the scraper conveyor, the fork prevents the tail sprocket from rotating clockwise under the elastic tension of the chain. At this time, the chain tensioning controller turns off the power of the drive unit, and the tail sprocket is stationary under the elastic tension of the chain and the action of the chain wheel component. The tensioned chain is in a braking state. At this time, the chain between the scraper component and the chain wheel component is in a slack state, and the chain links can be safely added or removed. Then the chain is connected through the connecting link. (5) The chain tensioner controls the rotation angle servo motor to rotate in the opposite direction, driving the chain wheel component to rotate clockwise by an angle α. The chain wheel component returns to its original position, causing the chain wheel component to disengage from the chain. (6) Remove the scraper components from the transition trough at the tail of the scraper conveyor and complete the chain tightening work.

3. The chain tightening method for a scraper conveyor according to claim 2, characterized in that: In step (4), the rotation angle of the chain wheel component should be less than 60°.

4. The chain tightening method for a scraper conveyor according to claim 3, characterized in that: The drive unit is a variable frequency motor.

Images