Hydraulic drag link device for articulated swivel head

Abstract

The present application relates to the technical field of coal mine scraper conveyor, and discloses a hinge rotary type head hydraulic chain blocking device, which comprises a head cover plate, a hydraulic drive mechanism, a chain blocking claw assembly, a limiting mechanism and a control unit. The head cover plate is detachably installed on the top of the head frame of the end-discharging type scraper conveyor and bears each mechanism to form an independent integral module. The hydraulic drive mechanism drives the chain blocking claw assembly to rotate around the hinge seat, so that the buffer pad at the end of the chain blocking claw body abuts against the surface of the scraper chain link, and a braking force is applied to the disconnected scraper chain. The control unit controls the extension and retraction of the hydraulic self-locking oil cylinder and the locking according to the detection signals of the pressure sensor and the displacement sensor, and the limiting mechanism limits the upward stroke of the chain blocking claw body. Through hydraulic pressing, pressure loss locking, limiting protection and the overall disassembly structure, the present application prevents the scraper chain from sliding down and accumulating in the chain channel during the chain tightening or cutting process, reduces the risk of manual chain handling, and avoids the influence of the chain blocking device on the head unloading.

Description

Technical Field

[0001] This invention relates to the field of coal mine scraper conveyor technology, specifically to a hinged rotary head hydraulic chain blocking device. Background Technology

[0002] End-discharge scraper conveyors are crucial equipment in the conveying system of fully mechanized coal mining faces. During installation, inspection, and maintenance, the scraper chain requires operations such as tightening and cutting. During these operations, the scraper chain will be in a disconnected state. After the chain loses its closed traction constraint, the chain segment located at the head sprocket shaft assembly is prone to slipping downwards under its own weight, accumulating within the lower chain track.

[0003] Existing chain-stopping methods mostly rely on chain stoppers installed on the intermediate plate of the transition trough to brake the scraper chain. These chain stoppers are located at a distance from the head sprocket shaft assembly. When the scraper chain is broken at the head of the conveyor, the chain segment near the sprocket shaft assembly may still slip down the conveyor path. After the chain slips, the chain tightening or cutting process is forced to stop, and operators need to approach the lower conveyor path to pull the accumulated chain back to the working position before continuing operation. This process increases maintenance time and the risk of personnel coming into contact with the broken chain and conveyor head components.

[0004] Meanwhile, the chain catchers at the transition trough location cannot directly clamp and constrain the chain at the head sprocket shaft assembly, resulting in a long braking force transmission path and making it difficult to adapt and adjust to the stress state of different scraper chains. Some mechanical chain catchers are also prone to rigid contact with the scraper chain during use, causing wear on the chain catcher components and chain contact surfaces. If the chain catcher structure occupies the unloading area at the head for an extended period, it may also interfere with the coal unloading process of the end-discharge scraper conveyor, affecting the efficiency of switching the equipment from maintenance to conveying mode.

[0005] Therefore, this invention proposes a hinged rotary head hydraulic chain device to overcome the shortcomings of the prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a hinged rotary head hydraulic chain-stopping device, which solves the problems of the scraper chain in the end-discharge scraper conveyor easily sliding down the chain track from the head sprocket shaft assembly and accumulating during chain tightening or chain cutting operations, causing operation interruption, time-consuming and laborious manual chain handling, safety risks for operators approaching the broken chain, and the difficulty of existing chain-stopping structures to provide stable braking for the scraper chain at the head position.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a hinged rotary head hydraulic chain blocking device, including a head cover plate, a hydraulic drive mechanism, a chain blocking claw assembly, a limiting mechanism, and a control unit. The head cover plate is detachably installed at the top of the head frame of an end-discharge scraper conveyor. The chain blocking claw assembly is located on the outer side of the head cover plate. The hydraulic drive mechanism is also located on the outer side of the head cover plate, with its power output end connected to the chain blocking claw assembly. The limiting mechanisms are symmetrically arranged above the head cover plate, restricting the upward swing stroke of the chain blocking claw assembly. The control unit is installed on the outer side of the head cover plate and connected to the hydraulic drive mechanism. The head cover plate, carrying the hydraulic drive mechanism, chain blocking claw assembly, limiting mechanism, and control unit, forms an independent integrated module. This independent integrated module can be completely disassembled and installed from the head frame of the end-discharge scraper conveyor.

[0009] The head cover has positioning connection holes on both sides. The head cover is fixedly connected to the head frame by detachable fasteners passing through the positioning connection holes. After the detachable fasteners are released, the head cover can be detached from the head frame.

[0010] A hinge seat is fixedly installed in the center of the top surface of the head cover. The chain claw assembly includes a hinge seat, chain claw bodies, and a buffer pad. There are two chain claw bodies, symmetrically arranged on both sides of the hinge seat. The middle part of the chain claw body is hinged to the hinge seat, forming a rotating pair between the chain claw body and the hinge seat. The chain claw body includes a force-bearing end and a clamping end. The force-bearing end of the chain claw body extends upward and is hinged to the power output end of the hydraulic drive mechanism. The clamping end of the chain claw body extends downward and points towards the scraper chain of the end-discharge scraper conveyor. The buffer pad is fixedly installed on the end face of the clamping end of the chain claw body.

[0011] A connecting seat is fixedly installed on the top surface of the machine head cover, located on the side of the hinge seat. The hydraulic drive mechanism includes a hydraulic self-locking cylinder and a hydraulic control system. There are two hydraulic self-locking cylinders, symmetrically arranged above the machine head cover. The tail end of the cylinder body of the hydraulic self-locking cylinder is hinged to the connecting seat. The end of the piston rod of the hydraulic self-locking cylinder is hinged to the force-bearing end of the chain catch. The hinge point at the tail end of the hydraulic self-locking cylinder, the hinge point at the end of the piston rod, and the rotating pair formed between the chain catch and the hinge seat together constitute the mechanical transmission mechanism. The hydraulic control system is connected to the hydraulic self-locking cylinder through hydraulic lines. The hydraulic self-locking cylinder generates linear thrust by performing extension and retraction movements.

[0012] The limiting mechanism includes a limiting cover plate. The limiting cover plate is symmetrically arranged above the head cover plate. The limiting cover plate is located above the force-bearing end of the chain catcher. The force-bearing end of the chain catcher comes into contact with the limiting cover plate. The limiting cover plate prevents the force-bearing end of the chain catcher from continuing to move upward, limiting the upward swing stroke of the chain catcher.

[0013] A pressure sensor is installed inside the hydraulic pipeline. A displacement sensor is installed at the hydraulic self-locking cylinder. The pressure sensor and the displacement sensor are connected by an electrical signal. The pressure sensor collects the pressure inside the hydraulic pipeline in real time and transmits the pressure signal to the control unit. The displacement sensor collects the linear displacement of the piston rod of the hydraulic self-locking cylinder in real time and transmits the linear displacement signal to the control unit. When the linear displacement reaches a displacement threshold and the pressure reaches a preset pressure threshold, the control unit sends a stop oil supply electrical signal to the hydraulic drive mechanism. Upon receiving the stop oil supply electrical signal, the hydraulic drive mechanism stops supplying hydraulic oil to the hydraulic pipeline. The hydraulic self-locking cylinder then activates its hydraulic locking function.

[0014] The control unit receives a release command from the remote operation terminal. Upon receiving the release command, the control unit sends a retraction electrical signal to the hydraulic drive mechanism. Upon receiving the retraction electrical signal, the hydraulic drive mechanism releases the hydraulic locking function of the self-locking cylinder and drives the piston rod of the self-locking cylinder to retract. When the linear displacement collected by the displacement sensor returns to its initial zero position, the control unit controls the hydraulic drive mechanism to stop operating.

[0015] The head cover plate, housing the hydraulic drive mechanism, chain catcher assembly, limit mechanism, and control unit, forms an independent integrated module. This independent integrated module allows for complete disassembly and installation from the head frame of the end-discharge scraper conveyor, reducing equipment downtime caused by maintenance operations. The complete disassembly of the independent integrated module restores the top of the head frame to an empty state, preventing the head cover plate, hydraulic drive mechanism, chain catcher assembly, limit mechanism, and control unit from obstructing the coal unloading trajectory of the end-discharge scraper conveyor, and avoiding the need to disassemble the hydraulic drive mechanism, chain catcher assembly, and limit mechanism one by one.

[0016] The hydraulic self-locking cylinder of the hydraulic drive mechanism extends its piston rod, driving the chain-stopping claw to rotate around the rotary joint, so that the clamping end of the chain-stopping claw applies braking force to the disconnected scraper chain. When a pressure loss occurs in the hydraulic line, the hydraulic self-locking cylinder activates its hydraulic locking function, locking the current displacement of the piston rod and maintaining the braking force applied to the scraper chain by the clamping end of the chain-stopping claw, preventing the disconnected scraper chain from slipping down the lower chain track of the end-discharge scraper conveyor under gravity. A buffer pad fixedly installed on the end face of the clamping end of the chain-stopping claw forms a non-metallic contact isolation layer between the chain-stopping claw and the flat ring surface of the scraper chain, avoiding direct rigid friction between the metal body of the chain-stopping claw and the scraper chain.

[0017] The limiting cover plate of the limiting mechanism restricts the upward rotation stroke of the force-bearing end of the chain claw body by abutting, preventing the reverse force transmitted by the scraper chain from acting excessively on the hydraulic self-locking cylinder, and avoiding the upward swing displacement of the chain claw body from exceeding the rated retraction stroke of the piston rod of the hydraulic self-locking cylinder; at the same time, a clearance gap is formed between the buffer pad and the scraper chain, which prevents the chain claw assembly from contacting the scraper chain in motion, and avoids interference with the coal conveying and unloading process of the end-discharge scraper conveyor.

[0018] The control unit sends oil supply or stop oil supply signals to the hydraulic drive mechanism based on the pressure signals collected by the pressure sensor and the linear displacement signals collected by the displacement sensor. This keeps the braking force applied by the chain catcher within a preset range, preventing excessive braking force from damaging the scraper chain rings. The control unit also receives chain catch and release commands from the remote operation terminal and executes the action control logic, replacing manual mechanical chain operation on the end-discharge scraper conveyor and reducing the safety risk of operators coming into contact with the disconnected scraper chain.

[0019] This invention provides a hinged rotary head hydraulic stop chain device. It has the following advantages: 1. This invention uses a hydraulic self-locking cylinder of a hydraulic drive mechanism to extend a piston rod, driving the chain-stopping claw to rotate downwards around a rotating pair. This causes the pressing end of the chain-stopping claw to apply braking force to the disconnected scraper chain, overcoming the downward tendency of the disconnected scraper chain due to gravity and preventing the scraper chain from slipping and accumulating on the lower chain track of the end-discharge scraper conveyor. The limiting cover plate of the limiting mechanism restricts the upward swing stroke of the force-bearing end of the chain-stopping claw by abutting, preventing the reverse force generated by the scraper chain from being excessively transmitted to the hydraulic self-locking cylinder. The buffer pad fixedly installed on the end face of the pressing end of the chain-stopping claw forms a non-metallic contact isolation layer between the chain-stopping claw and the flat ring surface of the scraper chain, avoiding direct rigid friction between the metal bodies.

[0020] 2. This invention uses a head cover plate to support the hydraulic drive mechanism, chain-stopping claw assembly, limiting mechanism, and control unit, forming an independent integrated module. After the end-discharge scraper conveyor completes chain tightening or chain cutting operations, the locking state of the detachable fasteners is released, and the independent integrated module is completely separated from the head frame of the end-discharge scraper conveyor. The overall disassembly method restores the top of the head frame to an empty state, preventing the structure of the head cover plate, hydraulic drive mechanism, chain-stopping claw assembly, limiting mechanism, and control unit from obstructing the coal unloading trajectory of the end-discharge scraper conveyor. It also avoids disassembling the hydraulic drive mechanism, chain-stopping claw assembly, and limiting mechanism one by one, reducing the equipment downtime when switching the end-discharge scraper conveyor from maintenance work state to normal conveying work state.

[0021] 3. This invention receives pressure signals from pressure sensors and linear displacement signals from displacement sensors via a control unit. When the linear displacement reaches a displacement threshold and the pressure reaches a preset pressure threshold, the control unit sends a stop oil supply electrical signal to the hydraulic drive mechanism, keeping the braking force applied by the chain claw within a preset range to avoid excessive braking force damaging the scraper chain ring. The control unit receives chain-blocking and release commands from the remote operation terminal and executes action control logic, replacing manual mechanical chain locking operations on the end-discharge scraper conveyor, eliminating the need for manual cleaning of the lower chain path, and reducing the safety risk of operators coming into contact with the disconnected scraper chain. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention.

[0023] Figure 2 This is a side view of the present invention.

[0024] Figure 3 This is a side sectional view of the present invention.

[0025] The components include: 1. Scraper chain; 2. Lower chain track; 3. Sprocket shaft assembly; 4. Head frame; 5. End-discharge scraper conveyor; 6. Head cover plate; 7. Hydraulic drive mechanism; 8. Chain-blocking claw assembly; 9. Limiting mechanism; 10. Control unit; 11. Positioning connection hole; 12. Detachable fastener; 13. Hinge seat; 14. Connecting seat; 15. Chain-blocking claw body; 16. Buffer pad; 17. Force-bearing end; 18. Pressing end; 19. Hydraulic self-locking cylinder; 20. Piston rod; 21. Pressure sensor; 22. Displacement sensor. Detailed Implementation

[0026] The technical solutions in 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.

[0027] See attached document Figure 1 To be continued Figure 3 This invention provides a hinged rotary head hydraulic chain-stopping device applied to an end-discharge scraper conveyor 5. During chain tightening and chain cutting operations, the scraper chain 1 of the end-discharge scraper conveyor 5 is in a disconnected state. Under the influence of gravity, the disconnected scraper chain 1 easily slips off the sprocket shaft assembly 3 at the head of the end-discharge scraper conveyor 5 and accumulates inside the lower chain track 2.

[0028] The articulated rotary head hydraulic chain blocking device is located at the top of the head of the end-discharge scraper conveyor 5. The articulated rotary head hydraulic chain blocking device is used to press and brake the scraper chain 1 located at the head of the end-discharge scraper conveyor 5 during chain tightening and chain cutting operations, to prevent the scraper chain 1 in the disconnected state from slipping and accumulating on the lower chain track 2 of the end-discharge scraper conveyor 5.

[0029] The articulated rotary head hydraulic chain blocking device includes a head cover plate 6, a hydraulic drive mechanism 7, a chain blocking claw assembly 8, a limiting mechanism 9, and a control unit 10. The head cover plate 6 is detachably installed on the top of the head of the end-discharge scraper conveyor 5. The chain blocking claw assembly 8 is located on the outside of the head cover plate 6.

[0030] The hydraulic drive mechanism 7 is located on the outside of the head cover plate 6. The power output end of the hydraulic drive mechanism 7 is connected to the chain-stopping claw assembly 8. The limiting mechanism 9 is symmetrically arranged above the head cover plate 6. The limiting mechanism 9 is used to limit the upward swing stroke of the chain-stopping claw assembly 8. The control unit 10 is installed on the outside of the head cover plate 6. The control unit 10 is connected to the hydraulic drive mechanism 7. The head cover plate 6, which carries the hydraulic drive mechanism 7, the chain-stopping claw assembly 8, the limiting mechanism 9, and the control unit 10, forms an independent module. The head cover plate 6, together with the hydraulic drive mechanism 7, the chain-stopping claw assembly 8, the limiting mechanism 9, and the control unit 10, can be completely disassembled or installed as a whole from the head of the end-discharge scraper conveyor 5.

[0031] The head cover plate 6 is located at the top of the head frame 4 of the end-discharge scraper conveyor 5. Positioning connection holes 11 are provided on both sides of the head cover plate 6. The head cover plate 6 is fixedly connected to the head frame 4 of the end-discharge scraper conveyor 5 by means of detachable fasteners 12 passing through the positioning connection holes 11.

[0032] After the detachable fastener 12 is released from its locked state, the head cover 6 can detach from the head frame 4 of the end-discharge scraper conveyor 5. A hinge seat 13 is fixedly installed in the center area of ​​the top surface of the head cover 6. A connecting seat 14 is fixedly installed on the top surface of the head cover 6 and on the side of the hinge seat 13. The head cover 6 serves as a load-bearing base supporting the hydraulic drive mechanism 7, the chain-stopping claw assembly 8, and the limiting mechanism 9. After the chain tightening operation is completed, the head cover 6, together with the hydraulic drive mechanism 7, the chain-stopping claw assembly 8, and the limiting mechanism 9, detaches from the head frame 4 of the end-discharge scraper conveyor 5 as a whole to avoid interference with the coal unloading operation of the end-discharge scraper conveyor 5.

[0033] The chain catch assembly 8 includes a hinge base 13, chain catch bodies 15, and a buffer pad 16. The hinge base 13 is fixedly mounted on the top surface of the machine head cover 6. There are two chain catch bodies 15. The two chain catch bodies 15 are symmetrically arranged on both sides of the hinge base 13. The middle part of the chain catch body 15 is hinged to the hinge base 13, and a rotating joint is formed between the chain catch body 15 and the hinge base 13. The chain catch body 15 can rotate about the central axis of the rotating joint.

[0034] The chain catcher 15 includes a force-receiving end 17 and a clamping end 18. The force-receiving end 17 of the chain catcher 15 extends upward and is hinged to the power output end of the hydraulic drive mechanism 7. The clamping end 18 of the chain catcher 15 extends downward and points towards the scraper chain 1 of the end-discharge scraper conveyor 5. A buffer pad 16 is fixedly installed on the end face of the clamping end 18 of the chain catcher 15.

[0035] In chain tightening and chain cutting operations, the force-bearing end 17 of the chain-stopping claw 15 receives the thrust output by the hydraulic drive mechanism 7. The chain-stopping claw 15 rotates downward around the rotating joint, causing the pressing end 18 of the chain-stopping claw 15 to move towards the scraper chain 1 until the bottom surface of the buffer pad 16 abuts against the flat ring surface of the scraper chain 1. The buffer pad 16 forms a non-metallic contact isolation layer between the pressing end 18 of the chain-stopping claw 15 and the flat ring of the scraper chain 1, avoiding direct rigid friction between the metal body of the chain-stopping claw 15 and the scraper chain 1, thereby reducing wear between the chain-stopping claw 15 and the scraper chain 1.

[0036] The hydraulic drive mechanism 7 includes two hydraulic self-locking cylinders 19 and a hydraulic control system. The two hydraulic self-locking cylinders 19 are symmetrically arranged above the head cover plate 6. A connecting seat 14 is fixedly mounted on the top surface of the head cover plate 6. The tail end of the cylinder body of the hydraulic self-locking cylinder 19 is hinged to the connecting seat 14.

[0037] The piston rod 20 of the hydraulic self-locking cylinder 19 is hinged to the force-bearing end 17 of the chain claw body 15. The hinge point at the tail of the cylinder body of the hydraulic self-locking cylinder 19, the hinge point at the end of the piston rod 20 of the hydraulic self-locking cylinder 19, and the rotating pair formed between the chain claw body 15 and the hinge seat 13 together constitute the mechanical transmission mechanism. The hydraulic control system is connected to the hydraulic self-locking cylinder 19 through hydraulic lines. The hydraulic self-locking cylinder 19 generates linear thrust by performing extension and retraction actions.

[0038] A linear thrust acts on the force-bearing end 17 of the chain-stopping claw 15, driving the chain-stopping claw 15 to rotate downwards around the rotary joint. This converts the linear thrust into a braking force applied to the scraper chain 1 of the end-discharge scraper conveyor 5 by the clamping end 18 of the chain-stopping claw 15. The hydraulic control system adjusts the input pressure of the hydraulic self-locking cylinder 19, changing the linear thrust generated by the hydraulic self-locking cylinder 19, and adjusting the braking force applied to the scraper chain 1 by the clamping end 18 of the chain-stopping claw 15, so that the braking force adapts to the chain-stopping requirements of different specifications of scraper chains 1.

[0039] The hydraulic self-locking cylinder 19 has a hydraulic locking function. When the hydraulic line loses pressure, the hydraulic self-locking cylinder 19 locks the current displacement state of the piston rod 20, maintains the braking force applied to the scraper chain 1 by the pressing end 18 of the chain claw 15, prevents the chain claw 15 from loosening, and avoids the scraper chain 1, which is in a disconnected state, from slipping down to the lower chain track 2 of the end-discharge scraper conveyor 5 due to gravity.

[0040] The limiting mechanism 9 includes a limiting cover plate. The limiting cover plate is symmetrically arranged above the head cover plate 6. The limiting cover plate is located above the force-bearing end 17 of the chain claw 15. When the piston rod 20 of the hydraulic self-locking cylinder 19 retracts, driving the chain claw 15 to rotate upward around the rotary joint, or when the scraper chain 1 of the end-discharge scraper conveyor 5 applies a reverse force to the buffer pad 16, driving the chain claw 15 to rotate upward around the rotary joint, the force-bearing end 17 of the chain claw 15 comes into contact with the limiting cover plate. The limiting cover plate prevents the force-bearing end 17 of the chain claw 15 from continuing to move upward, limiting the upward swing stroke of the chain claw 15.

[0041] The limiting cover prevents the upward swing displacement of the chain claw 15 from exceeding the rated retraction stroke of the piston rod 20 of the hydraulic self-locking cylinder 19, avoids mechanical interference between the chain claw 15 and adjacent structural components of the end-discharge scraper conveyor 5, and reduces the excessive transmission of reverse force to the hydraulic self-locking cylinder 19.

[0042] See attached document Figure 2 The control unit 10 is fixedly installed on the outside of the head cover 6. A pressure sensor 21 is installed inside the hydraulic lines of the hydraulic drive mechanism 7. A displacement sensor 22 is installed at the hydraulic self-locking cylinder 19. The pressure sensor 21 and the displacement sensor 22 are connected by an electrical signal. The pressure sensor 21 collects the pressure inside the hydraulic lines in real time and transmits the pressure signal to the control unit 10.

[0043] The control unit 10 determines, based on the pressure signal, whether the braking force applied by the buffer pad 16 of the chain claw 15 to the scraper chain 1 of the end-discharge scraper conveyor 5 reaches the preset requirement. When the braking force reaches the preset braking threshold, the control unit 10 controls the hydraulic drive mechanism 7 to stop inputting hydraulic oil into the hydraulic pipeline to avoid excessive braking force and damage to the flat ring of the scraper chain 1.

[0044] Displacement sensor 22 collects the linear displacement of piston rod 20 of hydraulic self-locking cylinder 19 in real time and transmits the linear displacement signal to control unit 10. Control unit 10 determines the position of chain claw 15 rotating around the rotary joint based on the linear displacement signal. Based on the position, control unit 10 determines whether the buffer pad 16 on the end face of the pressing end 18 of chain claw 15 has reached the predetermined position of contact with the flat ring surface of scraper chain 1.

[0045] The control unit 10 receives a chain-stopping command sent by the remote operation terminal. After receiving the chain-stopping command, the control unit 10 sends an extension electrical signal to the hydraulic drive mechanism 7. After receiving the extension electrical signal, the hydraulic drive mechanism 7 drives the piston rod 20 of the hydraulic self-locking cylinder 19 to perform the extension action. During the extension action of the piston rod 20 of the hydraulic self-locking cylinder 19, the control unit 10 continuously receives the linear displacement signal transmitted by the displacement sensor 22 and the pressure signal transmitted by the pressure sensor 21.

[0046] When the linear displacement reaches the displacement threshold and the pressure reaches the preset pressure threshold, the control unit 10 sends a stop oil supply electrical signal to the hydraulic drive mechanism 7. After receiving the stop oil supply electrical signal, the hydraulic drive mechanism 7 stops inputting hydraulic oil into the hydraulic pipeline. The hydraulic self-locking cylinder 19 activates the hydraulic locking function. The control unit 10 completes the clamping and braking process of the chain claw 15 against the scraper chain 1 of the end-discharge scraper conveyor 5 based on the closed-loop logic of the sensor data.

[0047] The control unit 10 receives a release command from the remote operation terminal. After receiving the release command, the control unit 10 sends a retraction electrical signal to the hydraulic drive mechanism 7. After receiving the retraction electrical signal, the hydraulic drive mechanism 7 releases the hydraulic locking function of the hydraulic self-locking cylinder 19 and drives the piston rod 20 of the hydraulic self-locking cylinder 19 to perform a retraction action. When the linear displacement collected by the displacement sensor 22 returns to the initial zero position, the control unit 10 controls the hydraulic drive mechanism 7 to stop operating. By receiving commands from the remote operation terminal and combining sensor data, the control unit 10 executes action logic control, replacing manual approach to the lower chain 2 of the end-discharge scraper conveyor 5 to perform manual mechanical chain locking operation, reducing the safety risk of downhole workers contacting the disconnected scraper chain 1.

[0048] When the articulated rotary head hydraulic chain device is installed on the top of the head frame 4 of the end-discharge scraper conveyor 5, and the end-discharge scraper conveyor 5 is in normal conveying operation, the piston rod 20 of the hydraulic self-locking cylinder 19 of the hydraulic drive mechanism 7 remains in the retracted state.

[0049] The retracted piston rod 20 pulls the force-bearing end 17 of the chain-stopping claw 15. The chain-stopping claw 15 rotates upward around the rotary joint. The force-bearing end 17 of the chain-stopping claw 15 displaces upward and abuts against the limiting cover plate of the limiting mechanism 9. The limiting cover plate restricts the chain-stopping claw 15 from continuing to swing upward. The pressing end 18 of the chain-stopping claw 15 moves away from the scraper chain 1 of the end-discharge scraper conveyor 5 as the chain-stopping claw 15 rotates. A clearance gap is formed between the buffer pad 16 on the end face of the pressing end 18 of the chain-stopping claw 15 and the scraper chain 1. The clearance gap prevents the chain-stopping claw assembly 8 from contacting the scraper chain 1 in motion. The articulated rotary head hydraulic chain-stopping device is in a clearance state to avoid interfering with the coal conveying and unloading processes of the end-discharge scraper conveyor 5.

[0050] When the end-discharge scraper conveyor 5 is ready to perform chain tightening or chain cutting operations, the hydraulic drive mechanism 7 drives the piston rod 20 of the hydraulic self-locking cylinder 19 to extend. The piston rod 20 of the hydraulic self-locking cylinder 19 outputs a linear thrust. The linear thrust acts on the force-bearing end 17 of the chain-stopping claw body 15.

[0051] The chain-stopping claw 15 rotates downwards around the rotary joint under the action of linear thrust. The clamping end 18 of the chain-stopping claw 15 rotates downwards along with the chain-stopping claw 15 and moves towards the scraper chain 1 of the end-discharge scraper conveyor 5 until the buffer pad 16 on the end face of the clamping end 18 of the chain-stopping claw 15 abuts against the flat ring surface of the scraper chain 1. After the buffer pad 16 abuts against the flat ring surface, the hydraulic self-locking cylinder 19 activates its hydraulic locking function. The hydraulic self-locking cylinder 19 locks the displacement state of the piston rod 20 and maintains the internal pressure of the hydraulic pipeline.

[0052] The buffer pad 16 continuously applies braking force to the flat ring of the scraper chain 1. After the scraper chain 1 of the end-discharge scraper conveyor 5 is disconnected, the braking force overcomes the downward tendency of the disconnected scraper chain 1 caused by gravity. The braking force keeps the scraper chain 1 at the position of the sprocket shaft assembly 3 at the head of the end-discharge scraper conveyor 5, preventing the disconnected scraper chain 1 from slipping into the lower chain track 2 of the end-discharge scraper conveyor 5, and avoiding the accumulation of the scraper chain 1 inside the lower chain track 2 of the end-discharge scraper conveyor 5.

[0053] After the end-discharge scraper conveyor 5 completes the chain tightening or chain cutting operation, it first receives a release command through the control unit 10, causing the hydraulic self-locking cylinder 19 to unlock and drive the piston rod 20 to retract, so that the clamping end 18 of the chain-stopping claw body 15 leaves the scraper chain 1. Then, the locking state of the detachable fastener 12 connecting the head cover plate 6 and the head frame 4 of the end-discharge scraper conveyor 5 is released. The head cover plate 6 and the hydraulic drive mechanism 7, chain-stopping claw assembly 8, limit mechanism 9 and control unit 10 set on the head cover plate 6 together constitute an independent integrated module.

[0054] The independent integrated module is separated from the top of the head frame 4 of the end-discharge scraper conveyor 5 and removed from the normal operating space of the end-discharge scraper conveyor 5. This overall disassembly of the independent integrated module restores the top of the head frame 4 of the end-discharge scraper conveyor 5 to an empty state, preventing the structure of the head cover plate 6, hydraulic drive mechanism 7, chain guard claw assembly 8, limit mechanism 9, and control unit 10 from obstructing the coal unloading trajectory of the end-discharge scraper conveyor 5. The structure of the independent integrated module avoids the need to disassemble the hydraulic drive mechanism 7, chain guard claw assembly 8, and limit mechanism 9 one by one, reducing the equipment downtime when switching the end-discharge scraper conveyor 5 from maintenance mode to normal conveying mode.

[0055] The head cover plate 6 supports the hydraulic drive mechanism 7, the chain-stopping claw assembly 8, the limiting mechanism 9, and the control unit 10, forming an independent integrated module. This independent integrated module supports the overall disassembly and installation from the head frame 4 of the end-discharge scraper conveyor 5, reducing equipment downtime caused by maintenance operations on the end-discharge scraper conveyor 5. The hydraulic self-locking cylinder 19 of the hydraulic drive mechanism 7 extends its piston rod 20, driving the chain-stopping claw body 15 to rotate around the rotary joint, so that the clamping end 18 of the chain-stopping claw body 15 applies braking force to the disengaged scraper chain 1.

[0056] When a pressure loss occurs in the hydraulic pipeline, the hydraulic self-locking cylinder 19 activates its hydraulic locking function, locking the current displacement state of the piston rod 20 and maintaining the braking force applied to the scraper chain 1 by the pressing end 18 of the chain claw 15, preventing the scraper chain 1, which is in a disconnected state, from slipping down to the lower chain track 2 of the end-discharge scraper conveyor 5 under gravity. A buffer pad 16 fixedly installed on the end face of the pressing end 18 of the chain claw 15 forms a non-metallic contact isolation layer between the chain claw 15 and the flat ring surface of the scraper chain 1, avoiding direct rigid friction between the metal body of the chain claw 15 and the metal body of the scraper chain 1. The limiting cover plate of the limiting mechanism 9 limits the upward rotation stroke of the force-bearing end 17 of the chain claw 15 by abutment, preventing excessive action of the reverse force transmitted by the scraper chain 1 on the hydraulic self-locking cylinder 19.

[0057] The control unit 10 sends an oil supply signal or a stop oil supply signal to the hydraulic drive mechanism 7 based on the pressure signal collected by the pressure sensor 21 and the linear displacement signal collected by the displacement sensor 22, so that the braking force applied by the chain claw 15 is kept within a preset range, and the excessive braking force is avoided from damaging the flat ring of the scraper chain 1.

[0058] The control unit 10 receives the chain-locking command and release command sent by the remote operation terminal and executes the action control logic to replace the manual approach to the end-discharge scraper conveyor 5 to perform manual mechanical chain-locking operation, thereby reducing the safety risk of operators coming into contact with the scraper chain 1 in the disconnected state.

[0059] Working principle: When the end-discharge scraper conveyor 5 is in normal conveying operation, the piston rod 20 of the hydraulic self-locking cylinder 19 of the hydraulic drive mechanism 7 remains retracted. The retracted piston rod 20 pulls the force-bearing end 17 of the chain-stopping claw 15, causing the chain-stopping claw 15 to rotate upwards around the rotary joint. The force-bearing end 17 of the chain-stopping claw 15 displaces upwards and abuts against the limiting cover plate of the limiting mechanism 9. The limiting cover plate prevents the force-bearing end 17 of the chain-stopping claw 15 from continuing to displace upwards, thereby limiting the upward swing stroke of the chain-stopping claw 15. In this state, the pressing end 18 of the chain-stopping claw 15 moves away from the scraper chain 1 of the end-discharge scraper conveyor 5 as the chain-stopping claw 15 rotates, and a clearance gap is formed between the buffer pad 16 on the end face of the pressing end 18 of the chain-stopping claw 15 and the scraper chain 1. The clearance prevents the chain claw assembly 8 from contacting the scraper chain 1 in motion, and avoids interference between the head cover 6, hydraulic drive mechanism 7, chain claw assembly 8, limit mechanism 9 and control unit 10 on the coal conveying and unloading process of the end-discharge scraper conveyor 5.

[0060] When the end-discharge scraper conveyor 5 is ready to perform chain tightening or chain cutting operations, the control unit 10 receives a chain-stopping command sent by the remote operation terminal. After receiving the chain-stopping command, the control unit 10 sends an extension electrical signal to the hydraulic drive mechanism 7. After receiving the extension electrical signal, the hydraulic drive mechanism 7 drives the piston rod 20 of the hydraulic self-locking cylinder 19 to perform the extension action. The piston rod 20 of the hydraulic self-locking cylinder 19 outputs a linear thrust, which acts on the force-receiving end 17 of the chain-stopping claw 15, driving the chain-stopping claw 15 to rotate downward around the rotary joint.

[0061] The clamping end 18 of the chain claw 15 rotates downwards with the chain claw 15 and moves towards the scraper chain 1 of the end-discharge scraper conveyor 5. During the extension action of the piston rod 20 of the hydraulic self-locking cylinder 19, the displacement sensor 22 collects the linear displacement of the piston rod 20 of the hydraulic self-locking cylinder 19 in real time and transmits the linear displacement signal to the control unit 10, and the pressure sensor 21 collects the pressure inside the hydraulic pipeline in real time and transmits the pressure signal to the control unit 10.

[0062] The buffer pad 16 on the end face of the clamping end 18 of the chain claw 15 contacts the flat ring surface of the scraper chain 1. When the linear displacement reaches the displacement threshold and the pressure reaches the preset pressure threshold, the control unit 10 determines that the braking force applied by the chain claw 15 to the scraper chain 1 of the end-discharge scraper conveyor 5 has reached the preset braking threshold. The control unit 10 sends a stop oil supply electrical signal to the hydraulic drive mechanism 7. After receiving the stop oil supply electrical signal, the hydraulic drive mechanism 7 stops inputting hydraulic oil into the hydraulic pipeline.

[0063] After the hydraulic drive mechanism 7 stops inputting hydraulic oil, the hydraulic self-locking cylinder 19 activates its hydraulic locking function. The hydraulic self-locking cylinder 19 locks the displacement state of the piston rod 20 and maintains the internal pressure of the hydraulic pipeline, causing the buffer pad 16 to continuously apply braking force to the flat ring of the scraper chain 1. The buffer pad 16 forms a non-metallic contact isolation layer between the pressing end 18 of the chain claw body 15 and the flat ring of the scraper chain 1, preventing the metal body of the chain claw body 15 from directly and rigidly rubbing against the scraper chain 1. After the scraper chain 1 of the end-discharge scraper conveyor 5 is disconnected, the scraper chain 1 in the disconnected state tends to slide down under the action of gravity. The braking force overcomes the downward trend of the scraper chain 1 in the disconnected state and keeps the scraper chain 1 at the position of the sprocket shaft assembly 3 at the head of the end-discharge scraper conveyor 5, preventing the scraper chain 1 in the disconnected state from sliding down to the lower chain track 2 of the end-discharge scraper conveyor 5 and accumulating inside the lower chain track 2.

[0064] If a pressure loss occurs in the hydraulic pipeline, the hydraulic self-locking cylinder 19 locks the current displacement state of the piston rod 20, maintaining the braking force applied to the scraper chain 1 by the pressing end 18 of the chain claw 15, preventing the chain claw 15 from loosening. If the scraper chain 1 of the end-discharge scraper conveyor 5 applies a reverse force to the buffer pad 16, driving the chain claw 15 to rotate upward around the rotating joint, the force-bearing end 17 of the chain claw 15 abuts against the limiting cover plate. The limiting cover plate prevents the reverse force transmitted by the scraper chain 1 from being excessively transmitted to the hydraulic self-locking cylinder 19, avoiding the upward swing displacement of the chain claw 15 exceeding the rated retraction stroke of the piston rod 20 of the hydraulic self-locking cylinder 19.

[0065] After the end-discharge scraper conveyor 5 completes the chain tightening or chain cutting operation, the control unit 10 receives a release command from the remote operation terminal. Upon receiving the release command, the control unit 10 sends a retraction electrical signal to the hydraulic drive mechanism 7. Upon receiving the retraction electrical signal, the hydraulic drive mechanism 7 releases the hydraulic locking function of the hydraulic self-locking cylinder 19 and drives the piston rod 20 of the hydraulic self-locking cylinder 19 to retract, causing the pressing end 18 of the chain-blocking claw 15 to leave the scraper chain 1. When the linear displacement collected by the displacement sensor 22 returns to the initial zero position, the control unit 10 controls the hydraulic drive mechanism 7 to stop operating.

[0066] Subsequently, the locking of the detachable fastener 12 connecting the head cover 6 and the head frame 4 of the end-discharge scraper conveyor 5 is released. The head cover 6, together with the hydraulic drive mechanism 7, chain guard claw assembly 8, limit mechanism 9, and control unit 10 located on the head cover 6, constitute an independent integrated module. The independent integrated module is separated from the top position of the head frame 4 of the end-discharge scraper conveyor 5 and removed from the normal operating space of the end-discharge scraper conveyor 5.

[0067] The overall disassembly of the independent module allows the top of the head frame 4 of the end-discharge scraper conveyor 5 to be returned to an empty state, preventing the structure of the head cover plate 6, hydraulic drive mechanism 7, chain claw assembly 8, limit mechanism 9 and control unit 10 from blocking the coal unloading trajectory of the end-discharge scraper conveyor 5, and avoiding the need to disassemble the hydraulic drive mechanism 7, chain claw assembly 8 and limit mechanism 9 one by one.

Claims

1. A hinged rotary head hydraulic stop chain device, characterized in that, It includes an end-discharge scraper conveyor (5), a head cover plate (6), a hydraulic drive mechanism (7), a chain claw assembly (8), a limit mechanism (9), and a control unit (10). The head cover plate (6) is installed on the top of the head frame (4) of the end-discharge scraper conveyor (5) in a detachable connection manner. The chain claw assembly (8) is located on the outside of the head cover plate (6). The hydraulic drive mechanism (7) is located on the outside of the head cover plate (6). The power output end of the hydraulic drive mechanism (7) is connected to the chain claw assembly (8) in a transmission manner. The limiting mechanism (9) is symmetrically arranged above the head cover plate (6), and the limiting mechanism (9) is used to limit the upward swing stroke of the chain claw assembly (8). The control unit (10) is installed on the outside of the head cover (6). The control unit (10) is connected to the hydraulic drive mechanism (7). The head cover (6) carries the hydraulic drive mechanism (7), the chain claw assembly (8), the limiting mechanism (9) and the control unit (10) to form an independent integrated module. The independent integrated module can be completely disassembled and installed from the head frame (4) of the end-discharge scraper conveyor (5).

2. The articulated rotary head hydraulic chain device according to claim 1, characterized in that, The head cover (6) has positioning connection holes (11) on both sides. The head cover (6) is fixedly connected to the head frame (4) through the positioning connection holes (11) by a detachable fastener (12). After the detachable fastener (12) is released from its locking state, the head cover (6) can be removed from the head frame (4).

3. The articulated rotary head hydraulic chain device according to claim 1, characterized in that, A hinge seat (13) is fixedly installed in the center area of ​​the top surface of the machine head cover (6). The chain claw assembly (8) includes the hinge seat (13), chain claw body (15) and buffer pad (16). There are two chain claw bodies (15). The two chain claw bodies (15) are symmetrically arranged on both sides of the hinge seat (13). The middle part of the chain claw body (15) is hinged to the hinge seat (13). A rotating pair is formed between the chain claw body (15) and the hinge seat (13).

4. The articulated rotary head hydraulic chain device according to claim 3, characterized in that, The chain claw body (15) includes a force-receiving end (17) and a pressing end (18). The force-receiving end (17) of the chain claw body (15) extends upward and is hinged to the power output end of the hydraulic drive mechanism (7). The pressing end (18) of the chain claw body (15) extends downward and points to the scraper chain (1) of the end-discharge scraper conveyor (5). The buffer pad (16) is fixedly installed on the end face of the pressing end (18) of the chain claw body (15).

5. The articulated rotary head hydraulic chain device according to claim 4, characterized in that, A connecting seat (14) is fixedly installed on the top surface of the machine head cover (6) and on the side of the hinge seat (13). The hydraulic drive mechanism (7) includes a hydraulic self-locking cylinder (19) and a hydraulic control system. There are two hydraulic self-locking cylinders (19). The two hydraulic self-locking cylinders (19) are symmetrically arranged above the machine head cover (6). The tail of the cylinder body of the hydraulic self-locking cylinder (19) is hinged to the connecting seat (14). The end of the piston rod (20) of the hydraulic self-locking cylinder (19) is hinged to the force-bearing end (17) of the chain claw body (15).

6. The articulated rotary head hydraulic chain device according to claim 5, characterized in that, The cylinder tail hinge point of the hydraulic self-locking cylinder (19), the piston rod (20) end hinge point of the hydraulic self-locking cylinder (19), and the rotating pair formed between the chain claw (15) and the hinge seat (13) together constitute a mechanical transmission mechanism. The hydraulic control system is connected to the hydraulic self-locking cylinder (19) through a hydraulic pipeline. The hydraulic self-locking cylinder (19) generates linear thrust by performing extension and retraction actions.

7. The articulated rotary head hydraulic chain device according to claim 4, characterized in that, The limiting mechanism (9) includes a limiting cover plate, which is symmetrically arranged above the machine head cover plate (6). The limiting cover plate is located above the force-bearing end (17) of the chain claw (15). The force-bearing end (17) of the chain claw (15) abuts against the limiting cover plate. The limiting cover plate prevents the force-bearing end (17) of the chain claw (15) from continuing to move upward, thus limiting the upward swing stroke of the chain claw (15).

8. A hinged rotary head hydraulic chain blocking device according to claim 6, characterized in that, A pressure sensor (21) is installed inside the hydraulic pipeline, and a displacement sensor (22) is installed at the hydraulic self-locking cylinder (19). The pressure sensor (21) is connected to the control unit (10) by an electrical signal, and the displacement sensor (22) is connected to the control unit (10) by an electrical signal.

9. A hinged rotary head hydraulic chain device according to claim 8, characterized in that, The pressure sensor (21) collects the pressure inside the hydraulic pipeline in real time and transmits the pressure signal to the control unit (10). The displacement sensor (22) collects the linear displacement of the piston rod (20) of the hydraulic self-locking cylinder (19) in real time and transmits the linear displacement signal to the control unit (10). When the linear displacement reaches the displacement threshold and the pressure reaches the preset pressure threshold, the control unit (10) sends a stop oil supply electrical signal to the hydraulic drive mechanism (7). After receiving the stop oil supply electrical signal, the hydraulic drive mechanism (7) stops inputting hydraulic oil into the hydraulic pipeline, and the hydraulic self-locking cylinder (19) starts the hydraulic locking function.

10. A hinged rotary head hydraulic chain blocking device according to claim 9, characterized in that, The control unit (10) receives a release command sent by the remote operation terminal. After receiving the release command, the control unit (10) sends a retraction electrical signal to the hydraulic drive mechanism (7). After receiving the retraction electrical signal, the hydraulic drive mechanism (7) releases the hydraulic locking function of the hydraulic self-locking cylinder (19) and drives the piston rod (20) of the hydraulic self-locking cylinder (19) to perform a retraction action. When the linear displacement collected by the displacement sensor (22) returns to the initial zero position, the control unit (10) controls the hydraulic drive mechanism (7) to stop operating.

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