Cylinder structure of auxiliary force-bearing mechanism

Abstract

The present invention relates to an oil cylinder structure for an auxiliary force-bearing mechanism, comprising a cylinder, an end cap, a piston rod, a piston, and a connecting plate. An outwardly extending cam is provided on the outer wall of the cylinder near the lower edge. The end cap is fixed to the upper open end of the cylinder and seals the cylinder. The piston is fixedly connected to the lower end of the piston rod. The piston rod passes through the end cap and slides up and down with the end cap. The piston also slides up and down with the cylinder. An exhaust passage connecting the inside and outside of the cylinder is provided on the side wall of the cylinder near the lower edge. The connecting plate is horizontally fixed to the upper end of the piston rod. One or more adjustment rings are sleeved on the cam, and a nut is screwed onto the end of the cam. The present invention is used in an auxiliary force-bearing mechanism to apply a constant downward hydraulic pressure to the travel system, so that the travel mechanism always maintains a normal meshing state, thereby providing effective traction.

Description

Technical Field

[0001] The present invention relates to an oil cylinder structure, which is mainly used in an auxiliary force-bearing mechanism used in conjunction with the track of a coal mining machine travel system. The auxiliary force-bearing mechanism can provide a constant downward force for the travel system, so that the travel mechanism always maintains a normal meshing state. Background Art

[0002] When the guide shoe of the coal mining machine encounters a large amount of hard and difficult-to-break rock environment, the walking system is prone to premature failure, especially the hardened layer of the bottom hook of the guide shoe wears quickly, and when the size of the guide frame of the guide shoe wears too much, it cannot ensure the normal engagement of the walking wheel and the pin row, which ultimately leads to a significant weakening of the climbing ability of the coal mining machine, seriously affecting mining, especially on working faces with an inclination of more than 20°, which will seriously affect or restrict mining.

[0003] In response to the above problems, the industry has proposed many optimization and improvement plans, including: increasing the depth of the hardened layer of the guide shoe and the walking wheel to increase their service life; setting the easily worn guide shoe bottom hook into a detachable structure, which can be replaced in time after wear to avoid overall replacement and reduce losses; strengthening maintenance and timely cleaning of hard rock blocks in the track to reduce the breakage of hard rock blocks by the walking system; adopting a new structure of the walking system, etc.

[0004] However, due to the complexity of on-site working conditions, in actual practice, no matter which of the above improvement solutions is used, it is impossible to completely avoid the impact of rock powder and hard rock blocks on the walking system. Therefore, the problem of wear of the guide shoes and walking wheels is still relatively prominent. Summary of the Invention

[0005] The object of the present invention is to provide a cylinder structure for an auxiliary force-bearing mechanism, which is used in the auxiliary force-bearing mechanism to apply a constant downward hydraulic pressure to the walking system. Even in the case of excessive wear between the bottom hook of the guide sliding shoe and the walking wheel teeth in a hard rock environment, the walking mechanism can maintain a normal meshing state, thereby providing effective traction.

[0006] The main technical solutions of the present invention are:

[0007] A cylinder structure of an auxiliary force-bearing mechanism includes a cylinder body, an end cover, a piston rod, a piston and a connecting plate. A cylindrical convex shaft extending outward is provided on the outer wall of the cylinder body near the lower edge. The end cover is fixed to the upper open end of the cylinder body and closes the cylinder body. The piston is fixedly connected to the lower end of the piston rod. The piston rod passes through the end cover and slides up and down with the end cover. At the same time, the piston slides up and down with the cylinder body. An exhaust channel connecting the inside and outside of the cylinder body is provided on the side wall of the cylinder body near the lower edge. The piston divides the internal space of the cylinder body into an upper hydraulic chamber and a lower atmospheric chamber. The connecting plate is horizontally fixed to the upper end of the piston rod.

[0008] The outer wall of the cylinder is preferably provided with a pair of guide structures which are axially symmetrically distributed relative to the center line of the cylinder.

[0009] The guide structure may be a cylindrical pin extending perpendicularly to the outer wall of the cylinder. The cylindrical pin is preferably located in the upper middle portion of the outer wall of the cylinder.

[0010] An oil inlet joint is installed on the end cover.

[0011] A manual air release plug may also be installed on the end cover.

[0012] The top of the piston rod and the connecting plate can be positioned by a stop structure and fixedly connected by a plurality of screws.

[0013] The manual air release plug includes a valve seat and a valve core, and the valve seat is threadedly connected to the air release plug mounting hole on the end cover. The valve seat is provided with an upper large valve hole, a middle small valve hole and a lower threaded hole. The valve core is arranged into an upper large valve core, a middle small valve core and a lower stud structure. The stud diameter is smaller than the small valve core. The large valve core and the small valve core are respectively matched with the large valve hole and the small valve hole. The stud is threadedly connected to the threaded hole. A sealing ring groove is respectively provided on the hole wall near the upper edge of the large valve hole and on the outer cylindrical surface near the upper edge of the small valve core. A sealing ring is provided in the sealing ring groove. An upper air hole and a lower air hole are provided. The upper end of the upper air hole opens on the outer cylindrical surface of the large valve core near the upper edge, and the lower end opens on the stepped end surface between the large and small valve cores. The upper end of the lower air hole opens on the outer cylindrical surface of the small valve core and is located below the sealing ring groove on the small valve core, and the lower end opens on the lower end surface of the stud. The lower end of the stud passes through the bottom end of the valve seat and extends into the vent plug mounting hole. A clamping ring is installed on the outer cylindrical surface of the stud. The outer diameter of the clamping ring is larger than the diameter of the threaded hole. When the clamping ring contacts the bottom surface of the valve seat, the upper end opening of the lower air hole is communicated with the large valve hole.

[0014] The cross section of the cylinder is preferably rectangular, the convex shaft is arranged on the front outer wall of the cylinder, and the cylindrical pins of the cylinder are arranged on the left and right outer walls of the cylinder.

[0015] The connecting plate may be in a strip shape, and the connecting plate is extended in the left-right direction. The left and right ends of the connecting plate are respectively provided with connecting plate cylindrical pins that extend in the left-right direction.

[0016] One or more adjusting rings are sleeved on the convex shaft, and a nut is screwed on the end of the convex shaft.

[0017] The beneficial effects of the present invention are:

[0018] The piston in the oil cylinder structure of the present invention divides the internal space of the cylinder into an upper hydraulic chamber and a lower atmospheric chamber. Under the action of pressurized oil in the hydraulic chamber, the cylinder moves upward relative to the piston and piston rod, or tends to move upward. This generates a corresponding pulling force between the piston rod and the cylinder. When the piston rod and cylinder are connected to the shearer's travel box and track, respectively, the travel box is pulled toward the track, effectively providing a constant downward thrust to the shearer's travel system. Even in complex working conditions such as hard rock and excessive wear between the guide shoe hook and the travel gear teeth, the travel mechanism is maintained in a downward pressure state, forcing the shearer's travel mechanism into a normal meshing state, thereby providing effective traction. Furthermore, the auxiliary force provided by the present invention also shares the force on the guide shoe hook, thereby significantly reducing wear on the guide shoe hook and extending its service life.

[0019] Since the cylinder can move up and down relative to the piston rod, when the cylinder is connected to the coal mining machine track, it can adapt to the up and down bending of the track relative to the walking box when the cylinder changes its working position with the track.

[0020] The arrangement of the cylindrical pin of the cylinder can provide a guide for the up and down reciprocating movement of the cylinder.

[0021] Since a cylindrical convex shaft is provided, the structural member connected to the track is hinged on the convex shaft, and the structural member connected to the track can swing slightly around the convex shaft, thereby adapting to the local ups and downs and angle changes caused by the up and down bending of the track.

[0022] The cylindrical pins of the connecting plate that are respectively arranged at the left and right ends of the connecting plate and extend to the left and right directions can be used as pin shaft structures when hingedly connecting the cylinder structure to other devices, so that the cylinder structure can swing slightly in the forward and backward directions, thereby adapting to the forward and backward bending of the coal mining machine track.

[0023] After the manual air bleed plug is installed and before the oil pressure in the hydraulic chamber acts, the air in the hydraulic chamber can be effectively discharged through the manual air bleed plug.

[0024] By using a combination of adjustment rings of different numbers and / or thicknesses, the front-to-back distance between other structural parts (parts that can directly contact the track) and the cylinder can be controlled, thereby adapting to the front-to-back bending of the coal mining machine track and providing sufficient deflection clearance to ensure normal contact between the roller and the track. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A top view of an embodiment of the present invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 1 BB cross-sectional view;

[0028] Figure 4 for Figure 1 CC cross-sectional view;

[0029] Figure 5 This is a schematic diagram of the structure and installation of the manual air bleed plug.

[0030] Figure markings: 11. Cylinder; 111. Cylinder cylindrical pin; 114. Protruding shaft; 115. Hydraulic chamber; 116. Air chamber; 12. Connecting plate; 121. Connecting plate cylindrical pin; 13. Piston rod; 14. Piston; 15. End cover; 16. Oil inlet connector; 17. Manual air bleed plug; 171. Valve seat; 172. Valve core; 1721. Upper air hole; 1722. Lower air hole; 173. Sealing ring; 18. Exhaust channel; 19. Adjusting ring. DETAILED DESCRIPTION

[0031] like Figure 1-5 As shown, the present invention discloses an oil cylinder structure of an auxiliary force-bearing mechanism, including a cylinder 11, an end cover 15, a piston rod 13, a piston 14 and a connecting plate 12. A cylindrical protrusion 114 extending outward is provided on the outer wall of the cylinder near the lower edge. The end cover is fixed to the upper open end of the cylinder and closes the cylinder. The piston is fixedly connected to the lower end of the piston rod. The piston rod passes through the end cover and slides up and down with the end cover. At the same time, the piston slides up and down with the cylinder. An exhaust channel 18 connecting the inside and outside of the cylinder is provided on the side wall of the cylinder near the lower edge. The piston divides the internal space of the cylinder into an upper hydraulic chamber 115 and a lower atmospheric chamber 116. The connecting plate is horizontally fixed to the upper end of the piston rod. By limiting the height of the connecting plate to be basically unchanged, the height of the piston rod and the piston can be indirectly restricted from falling.

[0032] When the constant oil pressure in the hydraulic chamber acts, the cylinder will move upward or tend to move upward relative to the piston and piston rod, thereby generating corresponding pulling force between the piston rod and the cylinder. When the piston rod and the cylinder are connected to the shearer walking box and the track respectively, the walking box will be pulled toward the track, which is equivalent to providing a constant downward thrust to the shearer walking system. Even in complex working conditions such as hard block rock and excessive wear between the guide shoe bottom hook and the walking wheel teeth, the walking mechanism can be kept in a downward pressure state, forcing the shearer's walking mechanism to be in a normal meshing state, thereby providing effective traction.

[0033] The provision of the cam shaft can facilitate the connection between other structural members in contact with the shearer track and the cylinder, so as to transmit force between the cylinder and the track.

[0034] Due to the provision of a cylindrical cam, other structural parts in contact with the shearer track can swing slightly around the center of the cam to adapt to the local ups and downs and angle changes caused by the up and down bending of the coal mining working surface.

[0035] A pair of guide structures are provided on the outer wall of the cylinder and are axially symmetrically distributed relative to the center line of the cylinder. The guide structures can guide the cylinder to maintain a roughly vertical direction when it moves up and down.

[0036] The guide structure preferably uses a cylindrical pin 111 extending perpendicularly to the outer wall of the cylinder. The cylindrical pin is preferably located in the upper middle portion of the outer wall of the cylinder. In this embodiment, the two cylindrical pins serving as the guide structure are of equal height.

[0037] An oil inlet connector 16 is also mounted on the end cover.

[0038] The end cap is also provided with a manual air release plug 17. After the manual air release plug is installed and before the oil pressure acts, the hydraulic chamber can be effectively discharged with the manual air release plug.

[0039] The top of the piston rod and the connecting plate can be positioned and securely connected by a stopper structure using a plurality of screws. In the embodiment shown in the accompanying drawings, a convex stopper is provided at the top of the piston rod, and a concave stopper is provided in the middle of the bottom surface of the connecting plate. The screws connecting the piston rod and the connecting plate are installed vertically at the point where the convex and concave stops intersect.

[0040] The manual bleed plug comprises a valve seat 171 and a valve core 172. The valve seat is threadedly connected to the bleed plug mounting hole in the end cap. The valve seat is provided with an upper large valve hole, a middle small valve hole, and a lower threaded hole. The valve core is configured as an upper large valve core, a middle small valve core, and a lower stud. The stud has a smaller diameter than the small valve core. The large valve core and the small valve core respectively mate with the large and small valve holes, and the stud is threadedly connected to the threaded hole. A sealing ring groove is provided on the wall of the large valve hole near the upper edge and on the outer cylindrical surface of the small valve core near the upper edge. A sealing ring 173 is installed in each sealing ring groove. The valve core is provided with an upper air hole 1721 and a lower air hole 1722. The upper end of the upper air hole opens on the outer cylindrical surface of the large valve core near the upper edge, and the lower end opens on the stepped end surface between the large and small valve cores. The upper end of the lower air hole opens on the outer cylindrical surface of the small valve core and is located below the sealing ring groove on the small valve core. The lower end opens on the lower end surface of the stud. The lower end of the stud passes through the bottom of the valve seat and extends into the bleed plug mounting hole. A retaining ring is mounted on the outer cylindrical surface of the stud. The outer diameter of the retaining ring is larger than the diameter of the threaded hole. When the retaining ring contacts the bottom surface of the valve seat, that is, when the valve core is rotated to its highest position, the upper end opening of the lower air hole communicates with the large valve hole, and then with the upper air hole, allowing the gas in the hydraulic chamber to be discharged. This stud and threaded hole connection structure can generate a certain axial force between the valve core and the valve seat to maintain pressure.

[0041] The top of the valve core may be provided with a circumferentially outwardly protruding flange, the diameter of the flange being larger than the diameter of the large valve core, so as to facilitate the screwing operation during manual deflation.

[0042] The cross section of the cylinder is preferably rectangular, the convex shaft is arranged on the front outer wall of the cylinder, and the cylindrical pins of the cylinder are arranged on the left and right outer walls of the cylinder.

[0043] The connecting plate is preferably in the shape of a strip, and the connecting plate extends in the left and right directions. The left and right ends of the connecting plate are respectively provided with connecting plate cylindrical pins 121 cantilevered in the left and right directions. When the cylinder structure is installed on other structural parts, the connecting plate cylindrical pins can be used to achieve hinge connection, so that the connecting plate, piston rod and piston can also make small swings in the front and back directions with the cylinder body.

[0044] The cam is preferably fitted with one or more adjustment rings 19, with a nut screwed onto the end of the cam. When other components that come into contact with the shearer track are installed, the nut prevents them from moving off the cam. By combining different numbers and / or thicknesses of adjustment rings, the distance between the other components and the cylinder can be controlled, thereby adapting to the fore-and-aft curvature of the shearer track and providing sufficient deflection clearance to ensure proper contact between the rollers and the track.

Claims

1. A cylinder structure of an auxiliary force-bearing mechanism, characterized in that: It includes a cylinder, an end cover, a piston rod, a piston and a connecting plate. A cylindrical convex shaft extending outward is provided on the outer wall of the cylinder near the lower edge. The end cover is fixed to the upper open end of the cylinder and closes the cylinder. The piston is fixedly connected to the lower end of the piston rod. The piston rod passes through the end cover and slides up and down with the end cover. At the same time, the piston slides up and down with the cylinder. An exhaust channel connecting the inside and outside of the cylinder is provided on the side wall of the cylinder near the lower edge. The piston divides the internal space of the cylinder into an upper hydraulic chamber and a lower atmospheric chamber. The connecting plate is horizontally fixed to the upper end of the piston rod. A pair of guide structures axially symmetrically distributed relative to the center line of the cylinder are provided on the outer wall of the cylinder. The guide structure adopts a cylindrical pin extending outward perpendicular to the outer wall of the cylinder, and the cylindrical pin is located in the upper middle part of the outer wall of the cylinder; the cross section of the cylinder is rectangular, the convex shaft is arranged on the front outer wall of the cylinder, and the cylindrical pin is arranged on the left and right outer walls of the cylinder, the connecting plate is strip-shaped, and the connecting plate extends along the left and right directions, and the left and right ends of the connecting plate are respectively provided with connecting plate cylindrical pins cantilevered to the left and right directions; the piston rod and cylinder are respectively used to connect with the coal mining machine walking box and track. When the constant oil pressure in the hydraulic chamber acts, the cylinder moves up or tends to move up relative to the piston and piston rod, which will pull the walking box toward the track, providing a constant downward thrust to the coal mining machine walking system.

2. The oil cylinder structure of the auxiliary force-bearing mechanism according to claim 1, characterized in that: An oil inlet joint is installed on the end cover.

3. The oil cylinder structure of the auxiliary force-bearing mechanism according to claim 2, characterized in that: A manual air release plug is also installed on the end cover.

4. The oil cylinder structure of the auxiliary force-bearing mechanism according to claim 3, characterized in that: The top of the piston rod and the connecting plate are positioned by a stop structure and fixedly connected by a plurality of screws.

5. The oil cylinder structure of the auxiliary force-bearing mechanism according to claim 4, characterized in that: The manual air release plug includes a valve seat and a valve core, and the valve seat is threadedly connected to the air release plug mounting hole on the end cover. The valve seat is provided with an upper large valve hole, a middle small valve hole and a lower threaded hole. The valve core is arranged into an upper large valve core, a middle small valve core and a lower stud structure. The stud diameter is smaller than the small valve core. The large valve core and the small valve core are respectively matched with the large valve hole and the small valve hole. The stud is threadedly connected to the threaded hole. A sealing ring groove is respectively provided on the hole wall near the upper edge of the large valve hole and on the outer cylindrical surface near the upper edge of the small valve core. A sealing ring is provided in the sealing ring groove. An upper air hole and a lower air hole are provided. The upper end of the upper air hole opens on the outer cylindrical surface of the large valve core near the upper edge, and the lower end opens on the stepped end surface between the large and small valve cores. The upper end of the lower air hole opens on the outer cylindrical surface of the small valve core and is located below the sealing ring groove on the small valve core, and the lower end opens on the lower end surface of the stud. The lower end of the stud passes through the bottom end of the valve seat and extends into the vent plug mounting hole. A clamping ring is installed on the outer cylindrical surface of the stud. The outer diameter of the clamping ring is larger than the diameter of the threaded hole. When the clamping ring contacts the bottom surface of the valve seat, the upper end opening of the lower air hole is communicated with the large valve hole.

6. The oil cylinder structure of the auxiliary force-bearing mechanism according to claim 1, 2, 3, 4 or 5, characterized in that: One or more adjusting rings are sleeved on the convex shaft, and a nut is screwed on the end of the convex shaft.

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