Hydraulic support pulling backward sliding round-link chain locking structure

Abstract

The utility model relates to the technical field of coal mine mechanical equipment, in particular to a hydraulic support pull-back sliding round-link chain locking structure which is characterized in that the double-lug end of a double-lug chain ring clamp is fixedly connected with a piston rod of a pull-back sliding jack, and the clamping groove end is provided with a first clamping groove and a second clamping groove which are used for fixing a flat ring and a vertical ring of a round-link chain respectively; first through holes are symmetrically formed in the two sides of the clamping groove end, and the hole walls of the first through holes are higher than the flat ring; the pin seat is contained in the flat ring, the pin seat is provided with a shaft hole which can correspond to the through hole and can allow the pin shaft to penetrate through, and limiting holes are symmetrically formed in the side face, parallel to the center line of the shaft hole, of the pin seat; a groove is formed in the pin shaft; and the limiting piece penetrates through the limiting hole and is matched with the groove. The round-link chain has the advantages that the pin shaft is inserted into the shaft hole of the pin seat and the first through hole of the double-lug chain ring clamp, the limiting piece penetrates through the limiting hole to be matched with the groove in the pin shaft, axial displacement of the pin shaft is limited, and therefore stability of the round-link chain in the pushing process of the hydraulic support is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mine machinery equipment, especially relates to a hydraulic support pull back round link chain locking structure. BACKGROUND

[0002] The top coal caving mining process is a high-efficiency coal mining method for longwall mining of thick coal seams, and is mainly used for underground mining operation of thick coal seams (generally with a thickness of more than 4.5 meters). The equipment used in the top coal caving mining process mainly includes a coal mining machine, a top coal caving hydraulic support, a front conveyor and a rear conveyor. The hydraulic support can reliably support and control the roof, isolate the goaf, and prevent gangue from entering the working face, so as to ensure the operation space and automatically move forward with the advancing of the working face, and continuously push the coal mining machine and the conveyor to the coal wall. The front conveyor is used to transport the coal cut by the coal mining machine, and the rear conveyor is used to transport the top coal dropped at the rear. The front conveyor is pushed by the hydraulic support, and the front movement of the rear conveyor needs to be pulled by the hydraulic support. The hydraulic support is connected with the rear conveyor through a pull-back round link chain and a round link chain. Among them, the rear conveyor refers to the rear conveyor, and the pull-back refers to the operation of moving the rear conveyor to the goaf direction during the coal mining process. After the coal mining machine cuts a coal, the hydraulic support pushes the front conveyor by one coal mining machine step, and the hydraulic support automatically moves the support. At this time, the piston rod of the pull-back round link chain is pulled out, and then the pull-back round link chain is contracted to pull the rear conveyor forward.

[0003] A connection structure is needed between the pull-back round link chain and the round link chain. The prior art uses a U-shaped chain ring clamp and a pin shaft to connect the round link chain. The piston rod of the pull-back round link chain is connected with the U-shaped chain ring clamp through the pin shaft, the round link chain is inserted into the opening of the U-shaped chain ring clamp, and is directly fixed through the pin shaft. The rear conveyor is moved forward by the traction of the round link chain. Since the U-shaped chain ring clamp and the round link chain are only connected through the pin shaft, stress concentration is easy to occur, and there is a defect of insufficient strength. In addition, there is a gap between the round link chain and the chain ring clamp, which is easy to move and cause the connection to loosen. After the connection between the round link chain and the chain ring clamp fails, the conveyor chain link needs to be disassembled for maintenance, which is high in maintenance cost and affects the advancing speed of the working face. The broken chain ring clamp may fly out due to hydraulic impact, which threatens the safety of the operators.

[0004] Therefore, a hydraulic support pull-back round link chain locking structure is needed to solve the problems of weak strength and easy loosening and falling off of the existing pull-back round link chain connection method. Utility model content

[0005] (I) Technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the hydraulic support pull back and run around circular chain locking structure solves the technical problems of weak strength of the existing pull back and run around circular chain connection mode and easy loosening and falling off of the circular chain during the pushing process of the hydraulic support.

[0007] (II) Technical solutions

[0008] In order to achieve the above-mentioned purposes, the main technical scheme adopted by the utility model comprises:

[0009] The hydraulic support pull back and run around circular chain locking structure comprises a circular chain formed by a plurality of flat rings and vertical rings which are sequentially sleeved, and further comprises: a double-ear link card which comprises a double-ear part and a main body part arranged in sequence in the front-rear direction, the double-ear part being used for fixed connection with a pull back and run around jack; the main body part is provided with a first clamping groove for accommodating the flat ring and a second clamping groove for accommodating the vertical ring; the left and right side walls of the main body part are symmetrically provided with a first through hole, and the hole wall of the first through hole is higher than the flat ring; a pin seat and a pin shaft, the pin seat is accommodated in the annular hole of the flat ring, the pin seat is provided with an axial hole corresponding to the first through hole and capable of allowing the pin shaft to penetrate, and the two ends of the pin shaft are located in the corresponding first through holes; the front and rear sides of the axial hole are symmetrically provided with a limiting hole penetrating the pin seat in the vertical direction; a recess is arranged on the pin shaft; a limiting piece is arranged through the limiting hole and the axial hole, cooperates with the recess, and is used for limiting the axial displacement of the pin shaft in the first through hole and the axial hole.

[0010] Optionally, the axial hole and the first through hole are coaxially arranged, and the axial direction thereof is perpendicular to a vertical plane parallel to the vertical ring.

[0011] Optionally, the limiting hole intersects with the axial hole, and the axis of the limiting hole penetrates the axial hole.

[0012] Optionally, the limiting piece is a U-shaped clamp, the opening end of the U-shaped clamp is inserted into the limiting hole, and the U-shaped clamp has elasticity.

[0013] Optionally, the recess is a circular annular recess.

[0014] Optionally, the first clamping groove and the second clamping groove are both open towards the upper side of the main body part, the rear part of the first clamping groove is in communication with the front part of the second clamping groove, the second clamping groove penetrates the rear side wall of the main body part, the groove bottom of the second clamping groove is lower than that of the first clamping groove, and the height difference between the groove bottoms of the two is arranged to be such that when the circular chain is placed into the main body part, the flat ring can be horizontally accommodated in the first clamping groove, and the vertical ring can be vertically partially accommodated in the second clamping groove.

[0015] Optionally, the double-ear part is provided with a second through hole; the piston rod of the pull back and run around jack is inserted between the two second through holes, and a fastener penetrates the two second through holes and the piston rod located between the two second through holes.

[0016] Optionally, the front and rear side walls of the pin seat are symmetrically provided with positioning holes, the axis of the positioning hole is perpendicular to the axis of the limiting hole and perpendicular to the axis of the shaft hole; the positioning member is fixedly connected with the positioning hole, and the tail end of the positioning member passes through the positioning hole and abuts against the limiting member in the limiting hole towards the pin shaft.

[0017] Optionally, the limiting member is provided with a positioning groove matched with the positioning member.

[0018] Optionally, the positioning member is a spring pin, and the positioning pin of the spring pin has a curved surface at one end close to the shaft hole.

[0019] (Three) beneficial effects

[0020] The hydraulic support pull back and roll round ring chain locking structure of the utility model has the beneficial effects that: the hydraulic support pull back and roll round ring chain locking structure of the utility model, including double-eared chain ring card, round ring chain, pin seat, pin shaft and limiting member, the double-eared chain ring card is fixedly connected with the pull back and roll hydraulic jack through its double-eared part, the main part is provided with the first clamping groove for accommodating the flat ring and the second clamping groove for accommodating the vertical ring, the first through hole symmetrically provided with the left and right side walls of the main part is used for accommodating the pin shaft, and the hole wall of the first through hole is higher than the flat ring, the pin seat is accommodated in the annular hole of the flat ring, the pin shaft is inserted into the shaft hole of the pin seat and the two first through holes of the double-eared chain ring card, the limiting member passes through the limiting hole and cooperates with the groove on the pin shaft, the axial displacement of the pin shaft is limited, the round ring chain is tightly fixed, the round ring chain is prevented from falling off from the clamping groove, and therefore the safety and reliability of the round ring chain in the hydraulic support pushing process are ensured. In addition, the structure design of the double-eared chain ring card, the pin seat, the pin shaft and the limiting member improves the mechanical strength of the pull back and roll round ring chain connection mode. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a top view structural schematic drawing of the hydraulic support pull back and roll round ring chain locking structure of the utility model for connecting the hydraulic support and the rear transport machine;

[0022] Figure 2 It is a top view structural schematic drawing of the double-eared chain ring card in the hydraulic support pull back and roll round ring chain locking structure of the utility model;

[0023] Figure 3 It is a structural schematic drawing of the pin shaft of the hydraulic support pull back and roll round ring chain locking structure of the utility model;

[0024] Figure 4 It is a top view structural schematic drawing of the hydraulic support pull back and roll round ring chain locking structure of the utility model embodiment 1;

[0025] Figure 5 It is a sectional view schematic drawing of the pin seat of the hydraulic support pull back and roll round ring chain locking structure of the utility model embodiment 1;

[0026] Figure 6The utility model discloses a hydraulic support pull behind round link chain locking structure's section structure schematic diagram of example 1 of the utility model;

[0027] Figure 7 The utility model discloses a hydraulic support pull behind round link chain locking structure's section structure schematic diagram of example 2 of the utility model;

[0028] Figure 8 The utility model discloses a hydraulic support pull behind round link chain locking structure's limiting piece's structure schematic diagram of example 2 of the utility model;

[0029] Figure 9 The utility model discloses a hydraulic support pull behind round link chain locking structure's limiting piece's structure schematic diagram of example 2 of the utility model;

[0030] Figure 10 The utility model discloses a hydraulic support pull behind round link chain locking structure's limiting piece's structure schematic diagram of example 2 of the utility model;

[0031] Explanation of reference signs

[0032] 1: double -eared chain ring card;11: first card slot;12: second card slot;13: first through -hole;14: second through -hole;

[0033] 2: round link chain;21: flat ring;22: vertical ring;

[0034] 3: pin seat;31: limiting hole;32: axle hole;33: positioning hole

[0035] 4: pin shaft;41: recess;

[0036] 5: limiting piece;51: positioning groove;

[0037] 6: positioning piece;61: spring pin;611: positioning column;

[0038] 7: pull behind round jack;8: hydraulic support base;9: rear conveyer. Specific implementation

[0039] In order to better explain the utility model, so as to facilitate understanding, below, combining with the drawings, through specific implementation, the utility model is described in detail.The orientation of the "front", "rear", "left", "right", "upper", "lower" and other terms mentioned in this paper are with the direction of the Figure 2 And Figure 6 For reference.

[0040] For better understanding of the above technical solutions, the exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present application and to convey the complete scope of the present application to those skilled in the art.

[0041] Embodiment 1:

[0042] Referring to Figures 1-6 The present application provides a hydraulic support pull back and run around circular chain locking structure. Among them, Figure 1 The connection diagram of the hydraulic support pull back and run around circular chain locking structure of the present embodiment and the hydraulic support and the rear conveyor is shown, the position of the double ear chain ring clamp 1 refers to the locking structure of the present embodiment, one end of the pull back and run around jack 7 is fixed on one side of the hydraulic support base 8, the other end of the piston rod is fixedly connected with the front side of the locking structure of the present embodiment, the rear side of the locking structure is fixedly connected with the front end of the circular chain 2, and the rear end of the circular chain 2 is fixedly connected with the rear conveyor 9. When the coal cutter finishes cutting a coal, the hydraulic support pushes the front conveyor forward by one coal cutter step, the hydraulic support automatically moves the support, at this time the piston rod of the pull back and run around jack 7 is pulled out, then the pull back and run around jack 7 retracts the piston rod, because the piston rod, the locking structure, the circular chain 2 and the rear conveyor 9 are fixedly connected with each other, so the retracted piston rod can pull the rear conveyor 9 forward through the locking structure and the circular chain 2, thereby completing the "pull back and run around" operation.

[0043] The locking structure of the present embodiment includes a double ear chain ring clamp 1, a circular chain 2, a pin seat 3, a pin shaft 4 and a limiting piece 5.

[0044] The circular chain 2 is formed by sequentially sleeving a plurality of flat rings 21 and vertical rings 22, and has a specific structure of a plurality of chain rings that are mutually buckled. The double ear chain ring clamp 1 includes double ear portions and a main body portion arranged in sequence in the front-rear direction, and the double ear portions are used for fixedly connecting with the pull back and run around jack 7. Specifically, the double ear portions are provided with second through holes 14, the piston rod of the pull back and run around jack 7 is inserted between the two second through holes 14, and a fastener standardized in the mechanical field is passed through the two second through holes 14 and the piston rod between the two second through holes 14, so as to realize the fixed connection of the pull back and run around jack 7 with the double ear portions.

[0045] The main body portion of the double ear chain ring clamp 1 is provided with a first clamping groove 11 for accommodating the flat ring 21 and a second clamping groove 12 for accommodating the vertical ring 22. The inner wall structure of the first clamping groove 11 is adapted to the flat ring 21, and the displacement of the flat ring 21 in the front-rear direction and the left-right direction is limited by the inner wall of the first clamping groove 11. The inner wall structure of the second clamping groove 12 is adapted to the vertical ring 22, and the displacement of the vertical ring 22 in the left-right direction is limited by the inner wall of the second clamping groove 12.

[0046] Further, the first and second clamping grooves 11 and 12 are both open towards the upper side of the main body, the rear part of the first clamping groove 11 communicates with the front part of the second clamping groove 12, the second clamping groove 12 penetrates through the rear side wall of the main body, the groove bottom of the second clamping groove 12 is lower than that of the first clamping groove 11, and the height difference between the groove bottoms of the two is set such that when the circular chain 2 is placed in the main body, the flat ring 21 can be horizontally accommodated in the first clamping groove 11, and the vertical ring 22 can be vertically partially accommodated in the second clamping groove 12, so as to ensure that the flat ring 21 can maintain a horizontal state, so that the force state of the flat ring 21 and the circular chain 2 during the pull-back process is simple, the whole circular chain 2 is in a straight line after being carried, and the traction force of the pull-back jack 7 can be transmitted along the straight line.

[0047] Specifically, the groove bottom of the first clamping groove 11 is matched with the outer peripheral shape of the flat ring 21, which can provide uniform support force for the flat ring 21 and limit the displacement of the flat ring 21 in the downward direction, thereby ensuring that the flat ring 21 can still maintain a horizontal state when being loaded during the pull-back process. The front groove bottom of the second clamping groove 12 is arc-shaped, which can be matched with the shape of the vertical ring 22 to ensure that the vertical ring 22 is stably placed in the second clamping groove 12.

[0048] The left and right side walls of the main body of the double-ear link clamp 1 are symmetrically provided with first through holes 13, and the hole walls of the first through holes 13 are higher than the flat ring 21.

[0049] The pin seat 3 is accommodated in the annular hole of the flat ring 11, and the bottom of the pin seat 3 is in contact with the groove bottom of the first clamping groove 11. The pin seat 3 is provided with an axle hole 32 corresponding to the first through hole 13 and capable of allowing the pin shaft 4 to penetrate therethrough, and the two ends of the pin shaft 4 are respectively located in the corresponding first through hole 13. The front and rear sides of the axle hole 32 are symmetrically provided with limiting holes 31 penetrating the pin seat 3 in the vertical direction. The pin shaft 4 is provided with a groove 41. The limiting member 5 penetrates the limiting hole 31 and the axle hole 32 and cooperates with the groove 41 to limit the axial displacement of the pin shaft 4 in the first through hole 13 and the axle hole 32, thereby ensuring that the pin shaft 4 will not fall off during the pull-back process. The pin shaft 4 limits the displacement of the flat ring 21 in the upward direction through cooperation with the axle hole 32 of the pin seat 3 and the first through hole 13 of the main body, thereby ensuring that the flat ring 21 can still maintain a horizontal state when being loaded during the pull-back process.

[0050] Further, the limiting hole 31 intersects with the axle hole 32, and the axis of the limiting hole 31 penetrates the axle hole 32. Specifically, the limiting member 5 can penetrate the limiting hole 31 and the axle hole 32 and be embedded in the groove 41 on the pin shaft 4 to prevent the pin shaft 4 from axially displacing in the first through hole 13 and the axle hole 32.

[0051] Specifically, the pin seat 3 is a cuboid structure, which is vertically arranged in the annular hole of the flat ring 21. Preferably, the axis direction of the shaft hole 32 is perpendicular to the vertical plane parallel to the vertical ring 22, that is, the axis of the shaft hole 32 is perpendicular to the left and right side walls of the pin seat 3, and the shaft hole 32 is located at the middle position of the front and back direction of the first clamping groove 11. The shaft hole 32 and the first through hole 13 are coaxially arranged, and the pin shaft 4 passes through the first through hole 13 on one side, the shaft hole 32 and the first through hole 13 on the other side in sequence, so as to limit the upward movement of the flat ring 21.

[0052] The limiting hole 31 on the pin seat 3 intersects with the groove 41 on the pin shaft 4, so that the limiting piece 5 inserted into the limiting hole 31 can be clamped in the groove 41, thereby playing an axial limiting role on the pin shaft 4, avoiding the risk of axial outflow of the pin shaft 4 due to external force. The groove 41 is preferably a circular annular groove.

[0053] The limiting piece 5 is preferably a U-shaped clamp, the open end of which is inserted into the limiting hole 31, and the U-shaped clamp has elasticity, which can be conveniently inserted into the limiting hole 31 and matched with the groove 41. The elastic design of the U-shaped clamp not only facilitates assembly, but also provides a certain buffering effect during work, reducing the loosening of parts caused by vibration or impact. In addition, the material of the U-shaped clamp can be selected from high-strength alloy steel or stainless steel to meet the strength requirements under different working conditions.

[0054] It should be noted that the groove 41 in the embodiment is not limited to a circular annular groove, but can also be a groove of other shapes. Compared with grooves of other shapes, the circular annular groove does not need to be adjusted in angle when installing the pin shaft. No matter how the pin shaft 4 rotates, the limiting piece 5 can be embedded in the groove 41. The pin seat 3 and the double-ear chain ring clamp 1 are not limited to a split structure, but can also be integrally formed. The pin seat 3 directly contacts the pin shaft 4 and the circular ring chain 2, and may need to be replaced under frequent stress or wear. If the pin seat 3 is integrally formed with the double-ear chain ring clamp 1, when the pin seat 3 is worn or damaged, the entire double-ear chain ring clamp 1 needs to be replaced, which has high maintenance cost. Therefore, the split structure is preferred.

[0055] The utility model adopts the double-ear chain ring clamp 1, the first clamping groove 11 and the second clamping groove 12 arranged in the main part of the double-ear chain ring clamp 1 are respectively matched with the flat ring 21 and the vertical ring 22, and the structure of the first clamping groove 11 and the second clamping groove 12 limits the horizontal displacement of the circular ring chain 2. When the pull-back jack 7 pulls the rear conveyor 9 to move, the pulling force is transmitted through the double-ear chain ring clamp 1 and the circular ring chain 2. The flat ring 21 contacts the groove wall of the first clamping groove 11, and because the shape of the groove bottom is matched with the flat ring 21, the flat ring 21 can fully contact the groove wall of the first clamping groove 11, so that the pulling force is evenly distributed on the groove wall, the stress concentration is reduced, the damage of the circular ring chain 2 is reduced, and the stability of the structure is improved.

[0056] The limiting piece 5 passes through the limiting hole 31 and the shaft hole 32 of the pin seat 3 and is embedded in the groove 41 on the pin shaft 4, limiting the axial displacement of the pin shaft 4, avoiding the axial displacement of the pin shaft 4 due to external force, thereby avoiding the disconnection of the flat ring 21 and the double-ear chain ring clamp 1, preventing the rear conveyor 9 from moving normally and even causing an accident.

[0057] In specific implementation, first, the double-ear part of the double-ear chain ring clamp 1 is fixedly connected with the piston rod of the rear-pulling and rear-sliding chain wheel 7, then the flat ring 21 of the round-link chain 2 is embedded in the first clamping groove 11 of the double-ear chain ring clamp 1, and the vertical ring 22 is embedded in the second clamping groove 12, to ensure that the chain ring is tightly fitted with the clamping groove. Then the pin seat 3 is inserted into the annular hole of the flat ring 21, and the position of the pin seat 3 is adjusted so that the shaft hole 32 is aligned with the first through hole 13 on both sides of the double-ear chain ring clamp 1. The pin shaft 4 passes through the first through hole 13 of the double-ear chain ring clamp 1 and the shaft hole 32 of the pin seat 3 in sequence until the pin shaft 4 is completely penetrated, to ensure that the groove 41 of the pin shaft 4 is aligned with the limiting hole 31 of the pin seat. The limiting piece 5 is inserted into the limiting hole 31 of the pin seat 3, so that the limiting piece 5 is embedded in the groove 41 of the pin shaft 4. The limiting piece 5 cooperates with the groove 41 to prevent the pin shaft 4 from being axially displaced in the shaft hole 32, to ensure stable connection. The structural design of the double-ear chain ring clamp 1, the pin seat 3, the pin shaft 4 and the limiting piece 5 improves the mechanical strength of the rear-pulling and rear-sliding round-link chain connection mode.

[0058] Embodiment 2

[0059] With reference to Figures 7-10 On the basis of Embodiment 1, the structure and function of the hydraulic support rear-pulling and rear-sliding round-link chain locking structure in Embodiment 1 are maintained unchanged, and in this embodiment, a positioning piece 6 is introduced on the pin seat 3 to enhance the anti-disengagement effect of the limiting piece 5.

[0060] The front and rear side walls of the pin seat 3 are symmetrically provided with positioning holes 33, the axis of the positioning hole 33 is perpendicular to the axis of the limiting hole 31, and the axis of the shaft hole 32. Preferably, the axis of the positioning hole 33 is parallel to the front and rear direction, the axis of the shaft hole 32 is parallel to the left and right direction, and the axis of the limiting hole 31 is parallel to the up and down direction. The positioning piece 6 is fixedly connected with the positioning hole 33, for example, by interference fit. The end of the positioning piece 6 passes through the positioning hole 33 and presses the limiting piece 5 in the limiting hole 31 towards the pin shaft 4.

[0061] Specifically, the limiting piece 5 is provided with a positioning groove 51 cooperating with the positioning piece 6, that is, the end of the positioning piece 6 is inserted into the positioning groove 51 to prevent the disengagement of the limiting piece 5.

[0062] Specifically, the positioning piece 6 can be a spring pin 61, and the positioning column 611 of the spring pin 61 has a curved surface at one end close to the shaft hole 32. The design of the curved surface has a guiding effect, which can guide the limiting piece 5 to be smoothly inserted into the limiting hole 31, avoiding the jamming of the limiting piece 5 when it is inserted into the limiting hole 31.

[0063] It should be noted that the main role of the positioning member 6 is to prevent the limiting member 5 from being axially displaced in the limiting hole 31, so as to avoid that the limiting member 5 is loosened due to vibration, thereby causing the limiting member 5 to fail to play the axial limiting role on the pin shaft 4. Meanwhile, the spring pin 61 can also play the elastic buffering role on the limiting member 5, and the elastic design can absorb certain impact force and vibration, reduce the damage to other components, and prolong the service life of the whole structure. It should be noted that the positioning member 6 is not limited to the spring pin 61, but can also be a threaded pin, and the surface of the pin body is provided with external threads, and the internal threads are designed to cooperate in the positioning hole 33 of the pin seat 3, and the positioning hole 33 is screwed into the positioning hole 33 by rotating, thereby playing the anti-disengagement role on the limiting member 5.

[0064] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0065] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be directly contacted by the first and second features, or indirectly contacted by the first and second features through an intermediate medium. Moreover, the first feature is "above", "above" and "above" the second feature, which can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" the second feature, which can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0067] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can modify, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hydraulic support pull back and round ring chain locking structure, comprising a round ring chain (2) formed by a plurality of groups of flat rings (21) and vertical rings (22) connected in sequence, characterized in that, Also includes: The ear loop card (1) includes the ear part and the main part arranged in turn along the front and back direction, the ear part is used for fixed connection with the pull back and slide jack (7); The main part is provided with a first clamping groove (11) for accommodating the flat ring (21) and a second clamping groove (12) for accommodating the vertical ring (22); The left and right side walls of the main part are symmetrically provided with a first through hole (13), and the hole wall of the first through hole (13) is higher than the flat ring (21); Pin seat (3) and pin shaft (4), the pin seat (3) is accommodated in the annular hole of the flat ring (21), the pin seat (3) is provided with an axis hole (32) capable of corresponding with the first through hole (13) and allowing the pin shaft (4) to pass through, and the two ends of the pin shaft (4) are located in the corresponding first through hole (13) respectively; The front and back sides of the axis hole (32) are symmetrically provided with a limiting hole (31) penetrating the pin seat (3) in the vertical direction; The pin shaft (4) is provided with a groove (41); Limiting piece (5), the limiting piece (5) passes through the limiting hole (31) and the axis hole (32), cooperates with the groove (41), and is used for limiting the axial displacement of the pin shaft (4) in the first through hole (13) and the axis hole (32).

2. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The axis hole (32) and the first through hole (13) are coaxially arranged, and the axis direction is perpendicular to the vertical plane parallel to the vertical ring (22).

3. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The limiting hole (31) intersects with the axis hole (32), and the axis of the limiting hole (31) penetrates the axis hole (32).

4. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The limiting piece (5) is a U-shaped clamp, the open end of the U-shaped clamp is inserted into the limiting hole (31), and the U-shaped clamp has elasticity.

5. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The groove (41) is a circular annular groove.

6. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The first clamping groove (11) and the second clamping groove (12) are both open towards the upper side of the main part, the rear part of the first clamping groove (11) communicates with the front part of the second clamping groove (12), the second clamping groove (12) penetrates the rear side wall of the main part, the groove bottom of the second clamping groove (12) is lower than the groove bottom of the first clamping groove (11), and the height difference of the groove bottoms of the two is arranged to be when the round ring chain (2) is put into the main part, the flat ring (21) can be horizontally accommodated in the first clamping groove (11), and at the same time, the vertical ring (22) can be vertically partially accommodated in the second clamping groove (12).

7. The hydraulic support pull back and slide round ring chain locking structure of claim 1, wherein: The double-ear part is provided with a second through hole (14); the piston rod of the pull-back and roll-forward jack (7) is inserted between two second through holes (14), and a fastener passes through the two second through holes (14) and the piston rod between the two second through holes (14). 8.The hydraulic support pull-back and roll-forward round-link chain locking structure according to any one of claims 1-7, characterized in that: The front and rear side walls of the pin seat (3) are symmetrically provided with a positioning hole (33), the axis of the positioning hole (33) is perpendicular to the axis of the limiting hole (31) and perpendicular to the axis of the shaft hole (32); The positioning member (6) is fixedly connected with the positioning hole (33), and the tail end of the positioning member (6) passes through the positioning hole (33) and abuts against the limiting member (5) in the limiting hole (31) towards the pin shaft (4). 9.The hydraulic support pull-back and roll-forward round-link chain locking structure according to claim 8, characterized in that: The limiting member (5) is provided with a positioning groove (51) matched with the positioning member (6). 10.The hydraulic support pull-back and roll-forward round-link chain locking structure according to claim 8, characterized in that: The positioning member (6) is a spring pin (61), and the positioning column (611) of the spring pin (61) has a curved surface close to one end of the shaft hole (32).

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