Rolling auxiliary force floating mechanism

Abstract

The present invention relates to a rolling auxiliary force-bearing floating mechanism, comprising a lifting device, a roller device, and a frame. The frame is a cylindrical structure that penetrates from top to bottom. The majority of the lifting device is located within the frame. The lifting device utilizes a double-rod piston cylinder, the cylinder being mounted within the frame with a gap between the outer wall of the cylinder and the frame. An air passage is provided within the piston rod, the upper end of the air passage opening at the upper end face of the piston rod, the lower end of the air passage opening at the outer cylindrical surface of the piston rod and being close to the lower edge of the piston in the height direction, the lower end opening of the air passage being partially or entirely located below the piston, and the lower end of the piston rod being fixedly connected to a transition bracket. The transition bracket is hinged to the upper portion of the roller device, with the hinge axis extending horizontally forward and backward. A rearwardly protruding guide body is provided at the middle and lower portion of the roller device. The present invention ensures the normal meshing state of the walking system even in a hard rock environment where the guide shoe bottom hook and the walking wheel teeth are excessively worn, thereby providing effective traction.

Description

Technical Field

[0001] The invention relates to an auxiliary force-bearing mechanism used in conjunction with a track of a coal mining machine traveling system, which can provide a constant downward force for the traveling system, so that the traveling 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 purpose of the present invention is to provide a rolling auxiliary force-bearing floating mechanism, which can ensure the normal engagement state of the walking system even when the guide shoe bottom hook and the walking wheel teeth are excessively worn in a hard rock environment, thereby providing effective traction.

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

[0007] The cam is secured to the upper and lower parts of the cam, and the cam is secured to the lower parts of the cam when the cam is in a state of emergency.

[0008] Furthermore, the cylinder is hinged to the frame, and the hinge axis extends horizontally left and right. A reset device is also installed on the frame. The axis of the compression spring of the reset device extends forward and backward. The free end of the compression spring rests on the outer wall of the cylinder or is connected to the outer wall of the cylinder. The position of the reset device is higher than the hinge axis of the cylinder and the frame.

[0009] The upper and lower ends of the cylinder are respectively fixedly mounted with an upper end cover and a lower end cover. The cross section of the piston rod above the piston is rectangular. The upper end cover and the lower end cover are respectively connected to the piston rod above and below the piston for sliding up and down.

[0010] A protective cover is installed on the upper end cover, and the upper end of the piston rod is located in a chamber formed by the protective cover and the upper end cover. An air vent is provided on the upper side wall of the protective cover, and a manual air release plug is installed at the upper end opening of the airway.

[0011] The manual air release plug includes a valve seat and a valve core, the valve seat is threadedly connected to the upper end opening of the air channel, 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 the outer cylindrical surface near the upper edge of the small valve core, a sealing ring groove is provided in the sealing ring groove, and a sealing ring is provided in the valve core. 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 communicates with the air channel. 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 of the lower air hole opens and communicates with the large valve hole.

[0012] The roller device may include a vertical plate and a roller, the upper part of the vertical plate is hinged to the transition bracket, and the guide body is provided with a plurality of roller mounting holes arranged at intervals on the left and right, the axis of the roller mounting hole extends horizontally front and back, and the top and bottom of the roller mounting hole are respectively arranged as a top notch and a bottom notch that pass through the front and back, and there is a roller in each roller mounting hole, and the roller is mounted on the vertical plate, and a gap is maintained between the roller and the roller mounting hole, and the highest point of the roller is higher than the top surface of the guide body, and the roller and the rear side plate surface of the vertical plate located above the guide body form an L-shaped supporting structure, the top surface of the guide body is provided with a guide body wear-resistant layer, and the rear side plate surface of the vertical plate located above the guide body is provided with a vertical plate wear-resistant layer.

[0013] The surface of the roller is preferably provided with a plurality of anti-skid grooves, which extend along the axial direction of the roller and are front-to-back through grooves.

[0014] A plurality of pins can be fixed to the lower part of the vertical plate, and the pins correspond to the rollers one by one. The axis of the pin extends horizontally front and back, and the rear part of the pin is exposed in the roller mounting hole. The roller is rotatably supported on the rear journal of the pin through the roller group. A positioning cover is installed in the inner hole of the roller and behind the roller group. The positioning cover is fixed on the pin and axially limits the roller group. An oil injection channel is provided in the pin, and the inlet of the oil injection channel is opened on the exposed surface of the front part of the pin and is installed with an oil injection nozzle. The outlet of the oil injection channel is opened on the rear journal of the pin and is located between adjacent roller groups in the axial direction of the pin. A seal is provided between the positioning cover and the roller.

[0015] The frame may include a connecting seat and a positioning plate. The positioning plate is a C-shaped structure with an open side formed by a front plate, a side plate and a rear plate arranged in sequence. The connecting seat is installed on the open side of the positioning plate, so that the frame becomes a cylindrical structure with a rectangular cross-section, and the cross-section of the cylinder is rectangular.

[0016] Furthermore, a cylinder cylindrical pin is respectively provided on the left and right outer walls of the cylinder, a positioning plate cylindrical pin hole is provided on the inner wall of one side plate of the positioning plate, and a connecting seat cylindrical pin hole is provided on the side plate surface of the connecting seat facing the positioning plate, and the left and right cylinder cylindrical pins are respectively clearance-matched with the positioning plate cylindrical pin hole and the connecting seat cylindrical pin hole.

[0017] For any of the above technical solutions, the piston rod and the guide body are preferably vertically facing each other.

[0018] The beneficial effects of the present invention are:

[0019] Because the hydraulic pressure within the hydraulic chamber (which can utilize low-pressure oil from the shearer's own hydraulic system's back pressure) is utilized to apply a downward pressure to the shearer's travel system, and this force is maintained constant (unless the hydraulic pressure is adjusted), even in hard rock environments where the guide shoe hook and travel gear teeth experience excessive wear, the travel mechanism remains in a downward pressure state, maintaining proper meshing of the travel system and providing effective traction. Furthermore, the auxiliary force provided by the present invention also shares the force applied to the guide shoe hook, significantly reducing wear on the guide shoe hook and extending its service life.

[0020] The present invention can be directly installed on existing equipment and has good versatility.

[0021] Since the cylinder of the lifting device is installed on the frame, the piston rod and the piston can slide up and down relative to the cylinder, so the piston rod can change its position in the height direction relative to the traveling box together with the track, so that the rolling auxiliary force-bearing floating mechanism of the present invention can adapt to the up and down bending of the track relative to the traveling box.

[0022] Since the lifting device is hinged in the frame, the hinge axis extends left and right, and there is a gap between the lifting device and the frame, there is enough space to allow the lifting device to swing slightly back and forth during the lifting process, thereby adapting to the front and back bending of the track relative to the travel box.

[0023] The free left-right swing of the roller assembly relative to the piston rod ensures that the load on the lower roller is evenly distributed. The roller rolls relative to the track. Although the positive contact pressure is high, rolling friction causes minimal wear on both the roller and track surfaces. This helps extend the service life of the rolling auxiliary force-bearing floating mechanism while minimizing the impact on the track's life.

[0024] The piston rod and guide body are preferably aligned vertically so that the contact points between the piston rod, the roller and the track are basically maintained in the same vertical plane. This provides a better stress condition for the rolling auxiliary force-bearing floating mechanism, thereby increasing the service life of seals such as the piston in the lifting device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 for Figure 1 Left view of;

[0027] Figure 3 for Figure 1 A top view of

[0028] Figure 4 for Figure 3 AA section view;

[0029] Figure 5 for Figure 3 BB cross-sectional view;

[0030] Figure 6 for Figure 3 A top view of the positioning plate;

[0031] Figure 7 for Figure 1 A schematic structural diagram of the lifting device described in ;

[0032] Figure 8 for Figure 7 A schematic structural diagram of the manual air release plug;

[0033] Figure 9 for Figure 1 CC step cross-sectional view;

[0034] Figure 10 This is a schematic diagram of the state of the lifting device when it is sliding up and down accompanied by forward and backward deflection;

[0035] Figure 11 This is a schematic diagram of the state of the lifting device of the present invention when the piston rod is at the highest point;

[0036] Figure 12 This is a schematic diagram of the state of the lifting device of the present invention when the piston rod is at the lowest position;

[0037] Figure 13 This is a schematic diagram of the relative position relationship between the present invention, the guide shoe and the track of the coal mining machine during normal use.

[0038] Reference numerals:

[0039] 1. Lifting mechanism; 11. Cylinder; 111. Cylinder cylindrical pin; 115. Hydraulic chamber; 116. Air chamber; 12. Upper end cover; 13. Piston rod; 14. Piston; 15. Lower end cover; 17. Manual bleed plug; 171. Valve seat; 172. Valve core; 1721. Upper air hole; 1722. Lower air hole; 173. Sealing ring; 18. Protective cover; 181. Air vent; 19. Transition bracket;

[0040] 2. Roller assembly; 21. Vertical plate; 211. Vertical plate wear-resistant layer; 213. Guide body; 2131. Guide body wear-resistant layer; 22. Roller; 221. Anti-skid groove; 23. Pin; 24. Roller assembly; 25. Pressure plate; 26. Oil injection channel; 27. Seal; 28. Positioning cover;

[0041] 3. Connecting seat; 31. Side of the connecting seat facing the positioning plate; 32. Connecting seat positioning hole; 33. Connecting seat cylindrical pin hole; 35. Connecting seat mounting hole;

[0042] 4. Connecting seat screws;

[0043] 5. Positioning plate; 51. Overhang end surface; 52. Positioning plate positioning pin; 54. Inner wall of one side panel of the positioning plate; 55. Positioning plate cylindrical pin hole; 57. Positioning plate screw hole;

[0044] 6. Positioning plate screws;

[0045] 7. Reset device;

[0046] 01. Walking box;

[0047] 02. Track. DETAILED DESCRIPTION

[0048] like Figure 1-13As shown, the present invention discloses a rolling auxiliary force-bearing floating mechanism comprising a lifting device 1, a roller device 2, and a frame. The frame is a cylindrical structure extending from top to bottom, with the majority of the lifting device located within the frame. The lifting device utilizes a dual-rod piston cylinder. The cylinder barrel 11 of the piston cylinder is mounted within the frame, with a gap between the outer wall of the barrel and the frame. The upper and lower ends of the piston rod 13 extend outside the frame. An air passage is provided within the piston rod. The upper end of the air passage opens at the upper end surface of the piston rod, while the lower end opens at the outer cylindrical surface of the piston rod and is vertically adjacent to the lower edge of the piston 14. The lower end opening of the air passage is partially or entirely located below the piston, thus communicating with the lower chamber of the piston cylinder. The upper chamber of the piston cylinder is connected to the atmosphere via a normally open exhaust passage. The upper chamber of the piston cylinder serves as an atmospheric chamber 116, while the lower chamber of the piston cylinder serves as a hydraulic chamber 115. A transition bracket 19 is fixedly connected to the lower end of the piston rod. The transition bracket is hinged to the upper portion of the roller device, with the hinge axis extending horizontally forward and backward. A guide body 213 protruding backward is provided at the middle and lower part of the roller device, forming an L-shaped supporting structure for dragging the track 02 of the coal mining machine from the lower side of the coal wall.

[0049] When in use, the frame of the rolling auxiliary force-bearing floating mechanism is fixed on the coal mining machine walking box 01, specifically on the left outer wall of the left walking box and the right outer wall of the right walking box, and at the same time, the supporting structure supports the coal mining machine track 02 from the bottom of the coal wall side.

[0050] When constant hydraulic pressure is applied to the lifting mechanism, the lifting mechanism's cylinder tends to move downward, and the lifting mechanism's piston rod moves upward or tends to move upward relative to the cylinder. This creates a tensile force between the frame and the roller assembly, pulling the travel box toward the track. Specifically, the roller assembly exerts an upward pulling force on the track, and the frame applies a constant downward thrust to the shearer's travel system (including the travel wheels) through the travel box 01, forcing the shearer's travel wheels to remain engaged with the track pins, thereby providing effective traction. Even if a rock block is trapped in the tooth socket, sufficient traction can be used to crush the rock block and achieve normal engagement. Simultaneously, this hydraulic pressure ensures that the upper wear-resistant layer of the guide shoe maintains contact with the top surface of the track even when the guide shoe's bottom hook is worn.

[0051] The freedom of the piston rod to move up and down relative to the cylinder and the frame enables the rolling auxiliary force-bearing floating mechanism to adapt to the up and down bending of the track, that is, the up and down fluctuations of the track will not affect the rolling auxiliary force-bearing floating mechanism to continuously apply tension between the walking box and the track, so that the engagement between the walking wheel and the track pin row can be maintained durably without being affected by the degree of wear of the guide shoe bottom hook and whether there are rocks retained in the tooth socket, thereby maintaining effective traction durably.

[0052] Since the transition bracket is hinged to the upper part of the roller device, the roller device can freely swing left and right relative to the cylinder, so the rolling auxiliary force-bearing floating mechanism can adapt to the change of track angle caused by the ups and downs of the track.

[0053] The cylinder is hinged to the frame, and the hinge axis extends horizontally left and right. Combined with the gap between the frame and the outer wall of the cylinder, the piston rod can swing slightly back and forth during the up and down movement. Therefore, the rolling auxiliary force-bearing floating mechanism can also adapt to the forward and backward bending of the track 02 relative to the walking box.

[0054] Since the piston rod can move up and down and swing back and forth, the roller device can swing left and right, so that the rolling auxiliary force-bearing mechanism has a "floating" feature, which can avoid the conventional meshing system of the guide shoe walking wheel from getting stuck when it works.

[0055] The frame is also equipped with a reset device 7. The axis of the compression spring of this reset device extends forward and backward, and the free end of the compression spring abuts against or is connected to the outer wall of the cylinder. The reset device is positioned above the hinge axis between the cylinder and the frame. Under the action of the compression spring, the cylinder can promptly return to its vertical position after the lateral force disturbance is removed. When the free end of the compression spring abuts against the outer wall of the cylinder, installing a reset device on each of the front and rear sides of the frame achieves a better reset effect and facilitates the interchangeable installation of the rolling auxiliary force-bearing floating mechanism on the left and right travel boxes.

[0056] The cylinder barrel is fixedly mounted at its upper and lower ends with an upper end cap 12 and a lower end cap 15. The piston rod above the piston preferably has a rectangular cross-section. The upper end cap core is provided with a rectangular through-hole for the piston rod to pass through. The upper and lower end caps are slidably connected to the piston rod above and below the piston, respectively. A piston rod with a rectangular cross-section prevents circumferential twisting of the piston rod relative to the cylinder barrel.

[0057] Furthermore, a protective shroud 18 is mounted on the upper end cap, and the upper end of the piston rod is located within the chamber formed by the protective shroud and the upper end cap. A vent hole 181 is provided on the upper sidewall of the protective shroud. A manual air bleed plug 17 is mounted at the upper opening of the airway. Once installed and before oil pressure is applied, the manual air bleed plug allows for effective air removal from the hydraulic chamber.

[0058] The manual air release plug includes a valve seat 171 and a valve core 172. The valve seat is threadedly connected to the upper opening of the airway. 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 is smaller in diameter than the small valve core. The large and small valve cores 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 the sealing ring groove. An upper air hole 1721 and a lower air hole 1722 are respectively provided in the large valve core and the small valve core. 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 communicates with the airway. A retaining ring is installed 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 screwed out to the highest position, the upper end of the lower air hole opens to communicate with the large valve hole, and then communicates with the upper air hole, thereby discharging the gas in the hydraulic chamber. The use of the stud and threaded hole connection structure can generate a certain axial force between the valve core and the valve seat to maintain pressure.

[0059] 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.

[0060] The roller assembly 2 includes a vertical plate 21 and a roller 22. The upper portion of the vertical plate is provided with a connecting hole extending from front to back. The upper portion of the vertical plate is vertically plugged into the transition bracket and hingedly connected to the transition bracket via a pin extending from front to back, thereby achieving an articulated connection between the roller assembly and the transition bracket. The guide body is provided with a plurality of roller mounting holes spaced apart from each other. The axes of the roller mounting holes extend horizontally from front to back, and the top and bottom of the roller mounting holes are respectively configured as top and bottom notches extending from front to back. Each roller mounting hole contains a roller, which is mounted on the vertical plate and can rotate relative to the vertical plate. A gap is maintained between the roller and the roller mounting hole to ensure that the rotation of the roller is not impeded. The highest point of the roller (the portion exposed from the top notch of the roller mounting hole) is higher than the top surface of the guide body. The roller and the rear side panel of the vertical plate located above the guide body form an L-shaped support structure.

[0061] Because rollers are used, and their highest point is higher than the top surface of the guide body, rolling friction occurs between the lower surface of the rail on the coal wall side and the lower surface of the L-shaped support structure during normal operation, avoiding friction and wear caused by high contact stress. The presence of multiple rollers ensures that each roller is evenly loaded.

[0062] The top surface of the guide body is provided with a guide body wear-resistant layer 2131, and the rear surface of the vertical plate located above the guide body is provided with a vertical plate wear-resistant layer 211. In this case, the highest point of the roller should be higher than the top surface of the guide body wear-resistant layer. In other words, when a guide body wear-resistant layer is provided, the top surface of the guide body wear-resistant layer also serves as the surface of the guide body.

[0063] The guide body and the guide body wear-resistant layer also have the function of cleaning the mineral materials around the track, thereby reducing the adverse effects of these mineral materials on the roller.

[0064] The left and right edges of the rear side plate surface of the vertical plate located above the guide body can be set as inclined surfaces or chamfers to guide the rail end to the L-shaped supporting structure.

[0065] The board surface of the vertical board can be set to be a triangle or a trapezoid that is narrow at the top and wide at the bottom.

[0066] The surface of the roller is preferably provided with a plurality of anti-skid grooves 221 , which extend along the axial direction of the roller and are through-grooves in the front and back directions, and can prevent the contact surface between the roller and the track from slipping.

[0067] Regarding the roller mounting structure, multiple pins 23 are fixed to the lower portion of the vertical plate, typically forming a tight fit between the pins and the vertical plate. Each pin corresponds to a roller, with its axis extending horizontally forward and backward, and its rear end exposed in the roller mounting hole. The roller is rotatably supported on the rear journal of the pin by a roller assembly 24. A positioning cap 28 is mounted in the inner bore of the roller, behind the roller assembly. This cap can be screwed onto the pin and serves as an axial limiter for the roller assembly.

[0068] The roller set preferably has multiple rows spaced apart from each other, thus having a greater load-bearing capacity.

[0069] The pin is preferably provided with an oil injection channel 26, the inlet of which is opened on the exposed surface of the front of the pin to facilitate the injection of grease. A grease nozzle is installed at the inlet of the oil injection channel. The outlet of the oil injection channel is opened on the rear journal of the pin and is located between adjacent roller groups in the axial direction of the pin, so that grease can be provided to two adjacent roller groups at the same time. At the same time, a seal 27 is provided between the positioning cover and the roller to prevent grease from overflowing from the last row of roller groups to the outside of the roller. The provision of the oil injection channel can be used to regularly inject grease into the roller group, thereby ensuring that the roller group has sufficient lubrication.

[0070] Furthermore, the front portion of the pin shaft may be provided with a radially outwardly extending flange, and the pin shaft may be axially positioned on the vertical plate by means of the flange. The front side surface of the vertical plate is flush with the front end surface of the pin shaft, and a long strip pressure plate groove is provided on these two planes, in which a pressure plate 25 is installed, and the pressure plate is fixed to the vertical plate by a countersunk screw. Usually, a pressure plate passes through the front end surfaces of multiple adjacent pin shafts (at Figure 1 The area where the pressure plate contacts the front end of the pin is provided with a through hole, and the oiling nozzle is exposed in the through hole.

[0071] The frame may include a connecting seat 3 and a positioning plate 5. The positioning plate is a C-shaped structure with one side open, formed by a front plate, a side plate, and a rear plate arranged in sequence. The connecting seat is mounted on the open side of the positioning plate, making the frame a cylindrical structure with a rectangular cross-section. The cross-section of the cylinder is rectangular.

[0072] Furthermore, a cylinder cylindrical pin 111 is provided on each of the left and right outer walls of the cylinder, a positioning plate cylindrical pin hole 55 is provided on the inner wall 54 of one side plate of the positioning plate, and a connecting seat cylindrical pin hole 33 is provided on the side plate surface facing the positioning plate. The left and right cylinder cylindrical pins respectively cooperate with the positioning plate cylindrical pin holes and the connecting seat cylindrical pin holes to achieve an articulated connection between the cylinder and the frame. The cylinder cylindrical pin is preferably located in the upper middle portion of the cylinder, and the positioning plate cylindrical pin hole and the connecting seat cylindrical pin hole are preferably located in the upper middle portion of the inner wall of the frame. In this embodiment, the height of the frame is equal to the height of the cylinder, and the cylinder fits completely into the frame.

[0073] Regarding the connection between the connecting seat and the positioning plate, the connection method in the embodiment shown in the accompanying drawings is: a positioning plate screw hole 57 is respectively provided in the front plate and the rear plate of the positioning plate, and a positioning plate positioning pin 52 is respectively provided on the overhanging end surface 51 of the front plate and the rear plate. Correspondingly, two front and rear connecting seat positioning holes 32 are provided on the side plate surface 31 of the connecting seat facing the positioning plate. During installation, the overhanging end surfaces of the positioning plate and the front plate and the rear plate form a planar positioning with the side plate surface of the connecting seat facing the positioning plate, and the positioning plate positioning pin is inserted into the connecting seat positioning hole to form a pin positioning, and then the connecting seat and the positioning plate are connected and fastened by inserting the positioning plate screw 6 into the positioning plate screw hole 57.

[0074] When the frame is installed on the walking box, the connecting seat and the outer wall of the walking box fit together to form a plane positioning, and the protruding pin structure on the outer wall of the walking box and the connecting seat mounting hole 35 on the side panel of the connecting seat facing the walking box are inserted to form a pin positioning, and then the connecting seat is connected and fastened to the walking box by the connecting seat screw 4.

[0075] The piston rod and the guide body are directly opposite each other, so that the contact points of the piston rod, the roller and the track are basically kept in the same vertical plane, which has a better stress condition for the rolling auxiliary force-bearing floating mechanism, thereby increasing the service life of the piston and other seals in the lifting device.

Claims

1. A rolling auxiliary force-bearing floating mechanism, characterized in that: The lifting device comprises a lifting device, a roller device and a frame, wherein the frame is a cylindrical structure that passes through from top to bottom, and most of the lifting device is located in the frame. The lifting device adopts a double-rod piston cylinder, and the cylinder barrel of the piston cylinder is installed in the frame, and a gap is left between the outer wall of the cylinder barrel and the frame. The upper and lower ends of the piston rod extend to the outside of the frame, and an air channel is provided in the piston rod. The upper end of the air channel opens to the upper end face of the piston rod, and the lower end of the air channel opens to the outer cylindrical surface of the piston rod and is close to the lower edge of the piston in the height direction. Part or all of the lower end opening of the air channel is located below the piston, and the upper chamber of the piston cylinder is connected to the atmosphere through a normally open exhaust channel. The lower chamber of the piston cylinder is a hydraulic chamber. The lower end of the piston rod is fixedly connected to a transition bracket, and the transition bracket is hinged to the upper part of the roller device, and the hinge axis The cam is hinged to the frame, and the hinge axis extends horizontally left and right. The frame includes a connecting seat and a positioning plate. The positioning plate is a C-shaped structure with an open side formed by a front plate, a side plate and a rear plate arranged in sequence. The connecting seat is installed on the open side of the positioning plate, so that the frame becomes a cylindrical structure with a rectangular cross-section. The cross-section of the cylinder is rectangular. A cylinder pin is respectively provided on the left and right outer walls of the cylinder, and a positioning plate cylindrical pin hole is provided on the inner wall of one side plate of the positioning plate. A connecting seat cylindrical pin hole is provided on the side plate surface of the connecting seat facing the positioning plate, and the left and right cylinder cylindrical pins are respectively clearance-matched with the positioning plate cylindrical pin hole and the connecting seat cylindrical pin hole.

2. The rolling auxiliary force-bearing floating mechanism according to claim 1, characterized in that: A reset device is also installed on the frame. The axis of the compression spring of the reset device extends forward and backward. The free end of the compression spring rests on the outer wall of the cylinder or is connected to the outer wall of the cylinder. The position of the reset device is higher than the hinge axis of the cylinder and the frame.

3. The rolling auxiliary force-bearing floating mechanism according to claim 2, characterized in that: The upper and lower ends of the cylinder are respectively fixedly mounted with an upper end cover and a lower end cover. The cross section of the piston rod above the piston is rectangular. The upper end cover and the lower end cover are respectively connected to the piston rod above and below the piston for sliding up and down.

4. The rolling auxiliary force-bearing floating mechanism according to claim 3, characterized in that: A protective cover is installed on the upper end cover, and the upper end of the piston rod is located in a chamber formed by the protective cover and the upper end cover. An air vent is provided on the upper side wall of the protective cover, and a manual air release plug is installed at the upper end opening of the airway.

5. The rolling auxiliary force-bearing floating mechanism according to claim 4, characterized in that: The manual air release plug includes a valve seat and a valve core, the valve seat is threadedly connected to the upper end opening of the air channel, 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 the outer cylindrical surface near the upper edge of the small valve core, a sealing ring groove is provided in the sealing ring groove, and a sealing ring is provided in the valve core. 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 communicates with the air channel. 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 of the lower air hole opens and communicates with the large valve hole.

6. The rolling auxiliary force-bearing floating mechanism according to any one of claims 1, 2, 3, 4 and 5, characterized in that: The roller device includes a vertical plate and a roller, the upper part of the vertical plate is hinged to the transition bracket, and a plurality of roller mounting holes arranged at intervals on the left and right are opened on the guide body, the axis of the roller mounting hole extends horizontally front and back, and the top and bottom of the roller mounting hole are respectively set as a top notch and a bottom notch that pass through the front and back, and there is a roller in each roller mounting hole, and the roller is mounted on the vertical plate, and a gap is maintained between the roller and the roller mounting hole, and the highest point of the roller is higher than the top surface of the guide body, and the roller and the rear side plate surface of the vertical plate above the guide body form an L-shaped supporting structure, the top surface of the guide body is provided with a guide body wear-resistant layer, and the rear side plate surface of the vertical plate above the guide body is provided with a vertical plate wear-resistant layer.

7. The rolling auxiliary force-bearing floating mechanism according to claim 6, characterized in that: The surface of the roller is provided with a plurality of anti-skid grooves, which extend along the axial direction of the roller and are front-to-back through grooves.

8. The rolling auxiliary force-bearing floating mechanism according to claim 7, characterized in that: A plurality of pins are fixed to the lower part of the vertical plate, and the pins correspond to the rollers one by one. The axis of the pins extends horizontally front and back, and the rear part of the pins is exposed in the roller mounting hole. The roller is rotatably supported on the rear journal of the pin through the roller group. A positioning cover is installed in the inner hole of the roller and behind the roller group. The positioning cover is fixed on the pin and axially limits the roller group. An oil injection channel is provided in the pin, and the inlet of the oil injection channel is opened on the exposed surface of the front part of the pin and is installed with an oil injection nozzle. The outlet of the oil injection channel is opened on the rear journal of the pin and is located between adjacent roller groups in the axial direction of the pin. A seal is provided between the positioning cover and the roller.

9. The rolling auxiliary force-bearing floating mechanism according to any one of claims 1, 2, 3, 4 and 5, characterized in that: The piston rod and the guide body are vertically aligned.

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