Hydraulic control system of construction equipment

Abstract

The construction equipment hydraulic control system comprises a hydraulic mechanism, a driving mechanism, a reduction gearbox and a stroke limiting box, the driving mechanism is installed on the hydraulic mechanism, the output end of the driving mechanism is connected with the reduction gearbox, and the output end of the reduction gearbox is connected with the stroke limiting box; one end of an inner cavity of the stroke limiting box is provided with a rotationally-connected working shaft, the working shaft is in threaded connection with a limiting stud, a guide column is fixed to the working shaft, the limiting stud is fixedly connected with a movable base, the guide column is perpendicular to the movable base, the working shaft and the limiting stud rotate synchronously, and the movable base is made to be close to or away from the working shaft through the guide column. A rolling wheel is rotationally installed at the end, close to the limiting transverse plate, of the movable base, and a first reversing valve is installed in the stroke limiting box. Through rolling contact between the rolling wheels and the guide rail seat, the situation that the upper limiting seat or the lower limiting seat is inclined due to the fact that the movable seat is forcibly connected with the upper limiting seat or the lower limiting seat in an abutting mode, and limiting deviation is caused due to the fact that the limiting range changes is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control, and more specifically, to a hydraulic control system for construction equipment. Background Art

[0002] The hydraulic control system in construction equipment is an indispensable part of modern construction machinery. It realizes precise operation of various actuators (such as booms, buckets, tracks, etc.) by controlling the flow of hydraulic oil. The main components of the hydraulic system include hydraulic pumps, control valves, actuators (hydraulic cylinders or hydraulic motors), oil tanks, and pipes connecting these components.

[0003] Referring to the invention patent with announcement number CN102963830B, a hydraulic lifting device can achieve unidirectional or bidirectional limit through the travel limiter. The specific working principle of the hydraulic device is:

[0004] The drum shaft is fixed on one side of the drum, and the screw is connected to the drum shaft through a thread. The screw rotates synchronously with the drum shaft. The lifting distance is directly proportional to the number of revolutions of the drum. When the drum shaft rotates one circle, the screw moves one pitch in the inner hole of the drum shaft. The impact plate is fixed on one side of the screw. The impact plate on the screw is constrained by the guide rod and cannot rotate around the screw axis. It can only move back and forth with the screw. Therefore, the lifting distance is also directly proportional to the distance the impact plate moves on the screw.

[0005] When the upper and lower limit positions of the lifting are determined according to needs, the maximum distance that the impact plate is allowed to move on the screw can be calculated; when the impact plate moves beyond this distance, the upper limit plate or the lower limit plate connected to the reversing valve is pushed, and the upper limit plate is connected to the lower limit plate, and a long groove is opened on the lower limit plate to facilitate the adjustment of the lower limit distance.

[0006] When the upper and lower limit positions of the lifting are determined according to needs, the maximum distance allowed for the movement of the impact plate can be adjusted through the long groove of the lower limit plate; when the impact plate moves beyond this distance, the contact lever of the reversing valve is pushed to connect the hydraulic oil circuit, that is, to flow to the first hydraulically controlled one-way valve or the second hydraulically controlled one-way valve, resulting in the hydraulic oil being unable to pass through the lifting motor, thereby stopping the lifting movement when it reaches the upper or lower limit position. At this time, the drum can only rotate in the reverse direction.

[0007] Since the impact plate is rigidly abutted against the upper limit plate or the lower limit plate, when the surface of the upper limit plate or the lower limit plate is rough, the abutment friction of the impact plate is large, causing the upper limit plate to tilt relative to the horizontal plate of the lower limit plate, causing the limit range to change and resulting in limit deviation. Summary of the invention

[0008] The invention provides a construction equipment hydraulic control system to solve the problem that in the existing construction equipment hydraulic control system, the upper limit plate is inclined relative to the horizontal plate of the lower limit plate, so that the limit range changes and causes limit deviation.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic control system for construction equipment, comprising a hydraulic mechanism, a driving mechanism is installed on the hydraulic mechanism, a reduction box is installed on the output end of the driving mechanism, a travel limit box is installed on the output end of the reduction box, one end of the travel limit box is rotatably connected to a working shaft, one end of the working shaft is threadedly connected to a limit stud, a guide column is fixedly installed on the working shaft, a movable seat is fixedly connected to the limit stud, the guide column and the movable seat are perpendicular to each other, the working shaft and the limit stud rotate synchronously, the movable seat is moved closer to or away from the working shaft through the guide column, a roller is rotatably installed on one end of the movable seat close to the limit horizontal plate, a reversing valve 1 is installed inside the travel limit box, a limit horizontal plate is installed on the reversing valve 1, and the limit horizontal plate is used to control the opening or closing of the reversing valve 1, an upper limit seat and a lower limit seat are detachably installed at both ends of the limit horizontal plate, the upper limit seat and the lower limit seat both include a guide rail seat, a roller groove is opened on one side of the guide rail seat, and the roller is arranged to roll along the groove direction corresponding to the roller groove.

[0010] In a preferred embodiment, one end of the lower limit seat is connected to a delivery pipe, and one end of the delivery pipe is connected to an upper oil pipe. A lubricating oil chamber is opened inside the guide rail seat of the lower limit seat. The guide rail seat provides lubricating oil to the upper oil pipe through the delivery pipe, and the oil outlet end of the upper oil pipe is arranged obliquely above the control end of the reversing valve.

[0011] In a preferred embodiment, an intermediate seat is fixedly provided at the bottom end of the guide rail seat, a positioning cylinder is fixedly connected to the bottom end of the intermediate seat, an oil inlet is opened at the top of the intermediate seat of the lower limit seat, and the oil inlet is connected to the interior of the corresponding guide rail seat, a top plate is provided inside the roller groove of the lower limit seat, an extrusion plate is fixedly provided on one side of the top plate, and the extrusion plate is movably provided inside the lubricating oil chamber of the guide rail seat, when the roller abuts the top plate, the extrusion plate moves inside the lubricating oil chamber, so that the guide rail seat provides lubricating oil to the delivery pipe.

[0012] In a preferred embodiment, a correction seat is provided on one side of the limit horizontal plate, and the correction seat is fixedly installed on the reversing valve one, a swing rod one is fixedly provided between the limit horizontal plate and the control end of the reversing valve one, the correction seat includes a correction block, a center block is provided on one side of the correction block, and the center block is fixedly provided on the outer side of the swing rod one, a correction groove is opened on one side of the correction block, and a triangular block is fixedly provided on one side of the center block, when the tip of the triangular block abuts against the tip of the correction groove, the limit horizontal plate is located at the middle position of the control end of the reversing valve one, and when the limit horizontal plate is located at the middle position, the upper limit seat and the lower limit seat are in a vertical state.

[0013] In a preferred embodiment, a contraction groove is opened on one side of the correction seat, a linear driver 1 is installed inside the contraction groove, the output end of the linear driver 1 is fixedly connected to the correction block, and a pressure sensor is connected between the correction block and the inner wall of the contraction groove.

[0014] In a preferred embodiment, a main oil tank and a spare oil tank are provided on one side of the driving mechanism, and both the main oil tank and the spare oil tank are connected to the travel limit box, a reversing valve 2 is installed inside the travel limit box, and the reversing valve 2 is connected to the spare oil tank.

[0015] In a preferred embodiment, a reversing pipeline is provided at the oil supply end of the reversing valve 2, a control disk is provided at the control end of the reversing valve 2, a swing rod 2 is fixedly provided on the outer side of the control disk, the swing rod 2 includes three states of upward tilt, horizontal and downward tilt, and a tension spring is fixedly connected between the swing rod 2 and the reversing valve 2.

[0016] In a preferred embodiment, an automatic control mechanism is provided between the limit horizontal plate and the reversing valve 2. When the limit horizontal plate is in the upper limit state, the reversing valve 2 is opened to supply oil to the upper limit through the automatic control mechanism. When the limit horizontal plate is in the lower limit state, the reversing valve 2 is opened to supply oil to the lower limit through the automatic control mechanism.

[0017] In a preferred embodiment, the automatic control mechanism includes a touch seat, a rotating connecting block is installed on the touch seat, a fixed connecting frame is fixedly provided at one end of the limiting horizontal plate, the fixed connecting frame and the rotating connecting block are rotatably connected through a movable connecting frame, an upper stopper and a lower stopper are respectively installed at the top and bottom ends of the touch seat, the swing rod 2 is located between the upper stopper and the lower stopper, and a vertical guide mechanism is provided on one side of the touch seat.

[0018] In a preferred embodiment, the top and bottom ends of the touch seat are respectively provided with a through opening one and a through opening two, a mounting groove is provided in the middle of the touch seat, a mounting plate is provided on one side of the touch seat, a linear drive two is installed inside the mounting groove, and the output end of the linear drive two is fixedly connected to the mounting plate, an upper stopper and a lower stopper are respectively fixedly connected to the top and bottom ends of the mounting plate, and the upper stopper and the lower stopper are respectively movably arranged inside the through opening one and the through opening two.

[0019] The beneficial effects of the present invention are:

[0020] The present invention prevents the movable seat from forcibly abutting against the upper limit seat or the lower limit seat through rolling contact between the roller and the guide rail seat, so that the upper limit seat or the lower limit seat is tilted, the limit range changes, and limit deviation occurs.

[0021] The present invention delivers lubricating oil to the inside of the delivery pipe through the positioning cylinder, and finally adds lubricating oil to the control end of the reversing valve one through the upper oil pipe, thereby ensuring the smooth operation of the control end of the reversing valve one and avoiding forced abutment between the movable seat and the upper limit seat or the lower limit seat due to the jamming of the control end of the reversing valve one.

[0022] The present invention pushes the correction block close to the center block through a linear driver. At this time, the tip of the triangular block abuts against the side wall of the correction groove and generates a thrust on the correction block. The pressure change of the correction block is detected by a pressure sensor, thereby detecting that the limit cross plate deviates from the middle position of the control end of the reversing valve, and reminding the maintenance personnel to repair the control end of the reversing valve in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall frame structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the internal structure of the travel limit box of the present invention.

[0025] Figure 3 It is a connection schematic diagram of the reversing valve of the present invention.

[0026] Figure 4 It is a schematic diagram of the movable seat structure of the present invention.

[0027] Figure 5 It is a schematic diagram of the limiting horizontal plate structure of the present invention.

[0028] Figure 6 It is a schematic diagram of the structure of the lower limit seat of the present invention.

[0029] Figure 7 It is a schematic diagram of the correction seat structure of the present invention.

[0030] Figure 8 It is a schematic diagram of the correction block structure of the present invention.

[0031] Fig. 9 It is a schematic diagram of the second state of the reversing valve of the present invention.

[0032] Fig.10 It is a schematic diagram of the second state of the reversing valve of the present invention.

[0033] Fig.11 It is a schematic diagram of the second state three of the reversing valve of the present invention.

[0034] Fig.12 It is a schematic diagram of the structure of the trigger seat of the present invention.

[0035] Fig.13 It is a schematic diagram of the mounting plate structure of the present invention.

[0036] The accompanying drawings are marked as follows: 1, hydraulic mechanism; 2, driving mechanism; 3, reduction box; 4, travel limit box; 41, working shaft; 42, limit stud; 43, guide column; 44, movable seat; 441, roller; 45, reversing valve 1; 46, limit horizontal plate; 461, upper limit seat; 462, lower limit seat; 4621, guide rail seat; 46211, roller groove; 46212, top plate; 46213, extrusion plate; 4622, middle seat; 46221, oil inlet; 4623, positioning cylinder; 463, delivery pipe; 464, upper oil pipe; 465, positioning long groove; 466, swing rod 1; 467, fixed Fixed connecting frame; 468, movable connecting frame; 47, reversing valve 2; 471, reversing pipeline; 472, control panel; 473, swing rod 2; 474, tension spring; 5, main oil tank; 6, spare oil tank; 7, correction seat; 71, correction block; 711, correction groove; 72, center block; 721, triangular block; 73, contraction groove; 74, linear drive 1; 75, pressure sensor; 8, touch seat; 81, rotating connecting block; 82, through port 1; 83, mounting groove; 84, through port 2; 85, mounting plate; 86, upper block; 87, linear drive 2; 88, lower block; 9, vertical guide mechanism. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0038] Refer to the instruction manual Figures 1 to 6A construction equipment hydraulic control system includes a hydraulic mechanism 1, a driving mechanism 2 is installed on the hydraulic mechanism 1, a reduction box 3 is installed on the output end of the driving mechanism 2, a travel limit box 4 is installed on the output end of the reduction box 3, one end of the travel limit box 4 is rotatably connected to a working shaft 41, one end of the working shaft 41 is threadedly connected to a limit stud 42, a guide column 43 is fixedly installed on the working shaft 41, a movable seat 44 is fixedly connected to the limit stud 42, the guide column 43 and the movable seat 44 are perpendicular to each other, the working shaft 41 and the limit stud 42 rotate synchronously, and the movable seat 44 is moved closer or farther away through the guide column 43 A roller 441 is rotatably mounted on one end of the movable seat 44 close to the limit horizontal plate 46 away from the working shaft 41, a reversing valve 45 is mounted inside the stroke limit box 4, a limit horizontal plate 46 is mounted on the reversing valve 45, and the limit horizontal plate 46 is used to control the opening or closing of the reversing valve 45, and an upper limit seat 461 and a lower limit seat 462 are detachably mounted on both ends of the limit horizontal plate 46, and both the upper limit seat 461 and the lower limit seat 462 include a guide rail seat 4621, and a roller groove 4621 is opened on one side of the guide rail seat 4621, and the roller 441 is arranged to roll along the groove direction corresponding to the roller groove 46211.

[0039] It should be noted that the construction equipment refers to the prior art, including a lifting balance valve block, the lifting balance valve block controls the action of the driving mechanism 2, the driving mechanism 2 drives the rotation of the external drum through the reduction box 3, the working shaft 41 is fixed to the external drum, the limit stud 42 is connected to the working shaft 41 through a threaded connection, so that the working shaft 41 and the limit stud 42 rotate synchronously, the lifting distance is directly proportional to the number of revolutions of the drum, and the working shaft 41 rotates one circle, so that the limit stud 42 moves one pitch in the inner hole of the working shaft 41 , guided by the guide column 43, the movable seat 44 moves laterally towards or away from the working shaft 41, and the moving range of the movable seat 44 is limited by the upper limit seat 461 and the lower limit seat 462. The moving range is the maximum distance that the movable seat 44 can move. When the movable seat 44 exceeds the moving range, it will abut against the upper limit seat 461 or the lower limit seat 462, causing the limit cross plate 46 to rotate and close the oil supply pipeline, stopping the supply of hydraulic oil to the driving mechanism 2, so that the equipment stops moving when it reaches the upper or lower limit position.

[0040] In this embodiment, the implementation scenario is specifically as follows: when the movable seat 44 abuts against the upper limit seat 461 or the lower limit seat 462, the roller 441 first enters the corresponding roller groove 46211, and then slides along the roller groove 46211, thereby pushing the upper limit seat 461 or the lower limit seat 462 to tilt, and starting the reversing valve 45 to switch the oil supply, so that the lifting balance valve block stops moving, and through the rolling contact between the roller 441 and the guide rail seat 4621, the movable seat 44 is prevented from being forced to abut against the upper limit seat 461 or the lower limit seat 462, so that the upper limit seat 461 or the lower limit seat 462 is tilted, the limit range changes, and a limit deviation occurs.

[0041] Refer to the instruction manual Figure 2 and Figure 3 One end of the lower limit seat 462 is connected to a delivery pipe 463, and one end of the delivery pipe 463 is connected to an upper oil pipe 464. A lubricating oil chamber is opened inside the guide rail seat 4621 of the lower limit seat 462. The guide rail seat 4621 provides lubricating oil to the upper oil pipe 464 through the delivery pipe 463, and the oil outlet end of the upper oil pipe 464 is arranged obliquely above the control end of the reversing valve 45.

[0042] It should be noted that lubricating oil is added to the control end of the reversing valve 45 through the upper oil pipe 464 to ensure that the control end of the reversing valve 45 runs smoothly.

[0043] Furthermore, an intermediate seat 4622 is fixedly provided at the bottom end of the guide rail seat 4621, and a positioning cylinder 4623 is fixedly connected to the bottom end of the intermediate seat 4622. An oil inlet 46221 is provided at the top of the intermediate seat 4622 of the lower limit seat 462, and the oil inlet 46221 is communicated with the interior of the corresponding guide rail seat 4621. A top plate 46212 is provided inside the roller groove 46211 of the lower limit seat 462, and an extrusion plate 46213 is fixedly provided on one side of the top plate 46212, and the extrusion plate 46213 is movably provided inside the lubricating oil chamber of the guide rail seat 4621. When the roller 441 abuts against the top plate 46212, the extrusion plate 46213 moves inside the lubricating oil chamber, so that the guide rail seat 4621 provides lubricating oil to the delivery pipe 463.

[0044] It should be noted that the positioning cylinder 4623 is hollow, and a one-way pressure valve is installed at the oil inlet 46221. The lubricating oil chamber of the guide rail seat 4621 is squeezed by the extrusion plate 46213, and the lubricating oil is squeezed into the interior of the positioning cylinder 4623 through the oil inlet 46221, and then supplied to the upper oil pipe 464 through the delivery pipe 463.

[0045] In this embodiment, the implementation scenario is specifically as follows: when the movable seat 44 abuts against the lower limit seat 462, the roller 441 first contacts and pushes the top plate 46212, so that the extrusion plate 46213 moves toward the lubricating oil chamber of the guide rail seat 4621, thereby squeezing out the lubricating oil inside the lubricating oil chamber, and the one-way pressure valve of the oil inlet 46221 is opened by pressure, and the lubricating oil enters the middle seat 4622, and then is transported to the inside of the delivery pipe 463 through the positioning cylinder 4623, and finally, the lubricating oil is added to the control end of the reversing valve 45 through the upper oil pipe 464, thereby ensuring the smooth operation of the control end of the reversing valve 45, and avoiding the movable seat 44 and the upper limit seat 461 or the lower limit seat 462. Forced abutment occurs due to the jamming of the control end of the reversing valve 45.

[0046] Refer to the instruction manual Figure 7 and Figure 8A correction seat 7 is provided on one side of the limit horizontal plate 46, and the correction seat 7 is fixedly installed on the reversing valve 45. A swing rod 466 is fixedly provided between the limit horizontal plate 46 and the control end of the reversing valve 45. The correction seat 7 includes a correction block 71. A center block 72 is provided on one side of the correction block 71, and the center block 72 is fixedly provided on the outer side of the swing rod 466. A correction groove 711 is opened on one side of the correction block 71, and a triangular block 721 is fixedly provided on one side of the center block 72. When the tip of the triangular block 721 abuts against the tip of the correction groove 711, the limit horizontal plate 46 is located at the middle position of the control end of the reversing valve 45. When the limit horizontal plate 46 is located at the middle position, the upper limit seat 461 and the lower limit seat 462 are in a vertical state.

[0047] It should be noted that a long positioning groove 465 is provided on the limit horizontal plate 46 for installing the upper limit seat 461 and the lower limit seat 462. The limit horizontal plate 46 and the swing rod 466 are perpendicular to each other. The correction groove 711 is a triangular groove. The tip directions of the correction groove 711 and the triangular block 721 are the same, and the width of the correction groove 711 is greater than the width of the triangular block 721.

[0048] Furthermore, a contraction groove 73 is opened on one side of the correction seat 7, and a linear driver 74 is installed inside the contraction groove 73. The output end of the linear driver 74 is fixedly connected to the correction block 71, and a pressure sensor 75 is connected between the correction block 71 and the inner wall of the contraction groove 73.

[0049] It should be noted that the linear drive 74 is used to push the correction block 71 to move closer to or away from the central block 72, and the pressure sensor 75 is an existing telescopic pressure sensor.

[0050] In this embodiment, the implementation scenario is specifically as follows: when the limit horizontal plate 46 is tilted and then reset, the swing rod 466 has two states: tilted or vertical. When the swing rod 466 is tilted, it indicates that the limit horizontal plate 46 deviates from the middle position of the control end of the reversing valve 45. At this time, the limit ranges of the upper limit seat 461 and the lower limit seat 462 change, resulting in a limit deviation. The correction block 71 is pushed close to the center block 72 by the linear driver 74. At this time, the tip of the triangular block 721 abuts against the side wall of the correction groove 711 and generates a thrust on the correction block 71. The pressure change of the correction block 71 is detected by the pressure sensor 75, thereby detecting that the limit horizontal plate 46 deviates from the middle position of the control end of the reversing valve 45, and reminding the maintenance personnel to promptly repair the control end of the reversing valve 45.

[0051] When the equipment is at the upper limit position or the lower limit position, the equipment needs to continue to run a short distance to complete the work. At this time, it is necessary to put the lifted object back to its original position, and then adjust the position of the upper limit seat 461 or the lower limit seat 462. Finally, the equipment can continue to run to complete the work, which affects the construction efficiency.

[0052] Refer to the instruction manual Figures 9 to 13 In order to solve this problem, the following technical solution is also provided: a main oil tank 5 and a spare oil tank 6 are provided on one side of the driving mechanism 2, and the main oil tank 5 and the spare oil tank 6 are both connected to the travel limit box 4, and a reversing valve 2 47 is installed inside the travel limit box 4, and the reversing valve 2 47 is connected to the spare oil tank 6.

[0053] It should be noted that the reversing valve 1 45 is connected to the main oil tank 5, the limit cross plate 46 provides a limit for the reversing valve 1 45, the spare oil tank 6 is controlled by the reversing valve 2 47, and the working oil circuits of the main oil tank 5 and the spare oil tank 6 are the same.

[0054] Furthermore, a reversing pipeline 471 is provided at the oil supply end of the reversing valve 47, a control disk 472 is provided at the control end of the reversing valve 47, a swing rod 473 is fixedly provided on the outer side of the control disk 472, and the swing rod 473 includes three states of upward tilt, horizontal and downward tilt. A tension spring 474 is fixedly connected between the swing rod 473 and the reversing valve 47.

[0055] It should be noted that by tightening the tension spring 474, the swing arm 473 is kept in an upward tilted, horizontal or downward tilted state. The upward tilt and downward tilt of the swing arm 473 are switching working states, and the horizontal state of the swing arm 473 is the closed working state.

[0056] Furthermore, an automatic control mechanism is provided between the limit horizontal plate 46 and the reversing valve 47. When the limit horizontal plate 46 is in the upper limit state, the reversing valve 47 is opened to the upper limit oil supply through the automatic control mechanism. When the limit horizontal plate 46 is in the lower limit state, the reversing valve 47 is opened to the lower limit oil supply through the automatic control mechanism.

[0057] It should be noted that, through the linkage of the automatic control mechanism, when the limit horizontal plate 46 is in the upper limit state, the reversing valve 2 47 opens the upper limit oil supply; when the limit horizontal plate 46 is in the lower limit state, the reversing valve 2 47 opens the lower limit oil supply; when the limit horizontal plate 46 is in the horizontal position, the reversing valve 2 47 closes the oil supply.

[0058] Furthermore, the automatic control mechanism includes a touch seat 8, on which a rotating connecting block 81 is installed, a fixed connecting frame 467 is fixedly provided at one end of the limiting horizontal plate 46, and the fixed connecting frame 467 is rotatably connected to the rotating connecting block 81 through a movable connecting frame 468, an upper stopper 86 and a lower stopper 88 are respectively installed at the top and bottom ends of the touch seat 8, a swing rod 473 is located between the upper stopper 86 and the lower stopper 88, and a vertical guide mechanism 9 is provided on one side of the touch seat 8.

[0059] It should be noted that the vertical guide mechanism 9 includes a sleeve, which is fixed on the outer side of the touch seat 8. A vertical rod runs through the inside of the sleeve, and the vertical rod is vertically fixed inside the travel limit box 4. When the limit cross plate 46 drives the touch seat 8 to move, the touch seat 8 is moved vertically through the sleeve and the vertical rod, thereby driving the swing rod 2 473 to switch between three states. The reversing valve 2 47 is the existing technology. The control disk 472 is divided into three gears in three states. Each gear state has an automatic positioning mechanism, which avoids re-shifting due to inertia when shifting gears by tightening the tension spring 474.

[0060] Furthermore, a through-port 1 82 and a through-port 2 84 are respectively provided at the top and bottom ends of the touch seat 8, a mounting groove 83 is provided in the middle of the touch seat 8, a mounting plate 85 is provided on one side of the touch seat 8, a linear driver 2 87 is installed inside the mounting groove 83, and an output end of the linear driver 2 87 is fixedly connected to the mounting plate 85, an upper stopper 86 and a lower stopper 88 are respectively fixedly connected to the top and bottom ends of the mounting plate 85, and the upper stopper 86 and the lower stopper 88 are respectively movably arranged inside the through-port 1 82 and the through-port 2 84.

[0061] It should be noted that the second linear driver 87 pushes the mounting plate 85 away from or close to the trigger seat 8, so that the upper stopper 86 and the lower stopper 88 slide inside the first through-port 82 and the second through-port 84 respectively.

[0062] In this embodiment, the implementation scenario is specifically as follows: the mounting plate 85 is driven by the linear drive 87 to approach the touch seat 8. At this time, the upper block 86 and the lower block 88 slide out to the outside of the opening 1 82 and the opening 2 84 respectively, so that the swing rod 2 473 can abut against the upper block 86 or the lower block 88. When the limit cross plate 46 tilts toward the upper limit seat 461, the touch seat 8 moves vertically downward, and the upper block 86 drives the swing rod 2 473 to tilt downward. Conversely, the limit cross plate 46 tilts toward the lower limit seat 462 to make the swing rod 2 473 tilt upward. During the return process, the swing rod 2 473 is brought back to a horizontal state. When the equipment is at the upper limit or the lower limit, by starting the reversing valve 47 and the spare oil tank 6, hydraulic oil can be provided to the equipment separately, so that the equipment can continue to run for a short distance to complete the work. There is no need to adjust the limit distance of the limit cross plate 46, thereby improving the construction efficiency.

[0063] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A hydraulic control system for construction equipment, comprising a hydraulic mechanism, a driving mechanism, a reduction box and a travel limit box, wherein the driving mechanism is installed on the hydraulic mechanism, the output end of the driving mechanism is connected to the reduction box, and the output end of the reduction box is connected to the travel limit box; a rotatably connected working shaft is arranged at one end of the inner cavity of the travel limit box, a limit stud is threadedly connected to the working shaft, a guide column is fixed to the working shaft, a movable seat is fixed to the limit stud, the guide column and the movable seat are perpendicular to each other, the working shaft and the limit stud rotate synchronously, and the movable seat is moved close to or away from the working shaft through the guide column, characterized in that: It includes a roller rotatably installed at one end of the movable seat close to the limit horizontal plate, a reversing valve 1 is installed inside the travel limit box, a limit horizontal plate is installed on the reversing valve 1, and the limit horizontal plate is used to control the opening or closing of the reversing valve 1; an upper limit seat and a lower limit seat are detachably installed at both ends of the limit horizontal plate, and the upper limit seat and the lower limit seat both include a guide rail seat, a roller groove is opened on one side of the guide rail seat, and the roller is arranged to roll along the groove direction corresponding to the roller groove.

2. The construction equipment hydraulic control system according to claim 1, characterized in that: One end of the lower limit seat is connected to a delivery pipe, and one end of the delivery pipe is connected to an upper oil pipe. A lubricating oil chamber is opened inside the guide rail seat of the lower limit seat. The guide rail seat provides lubricating oil to the upper oil pipe through the delivery pipe, and the oil outlet end of the upper oil pipe is arranged obliquely above the control end of the reversing valve.

3. The construction equipment hydraulic control system according to claim 2, characterized in that: An intermediate seat is fixedly provided at the bottom end of the guide rail seat, and a positioning cylinder is fixedly connected to the bottom end of the intermediate seat. An oil inlet is provided at the top of the intermediate seat of the lower limit seat, and the oil inlet is communicated with the interior of the corresponding guide rail seat. A top plate is provided inside the roller groove of the lower limit seat, and an extrusion plate is fixedly provided on one side of the top plate, and the extrusion plate is movably provided inside the lubricating oil chamber of the guide rail seat. When the roller abuts against the top plate, the extrusion plate moves inside the lubricating oil chamber, so that the guide rail seat provides lubricating oil to the delivery pipe.

4. The construction equipment hydraulic control system according to claim 3, characterized in that: A correction seat is provided on one side of the limit cross plate, and the correction seat is fixedly installed on the reversing valve. A swing rod is fixedly provided between the limit cross plate and the control end of the reversing valve. The correction seat includes a correction block. A center block is provided on one side of the correction block, and the center block is fixedly provided on the outer side of the swing rod. A correction groove is opened on one side of the correction block, and a triangular block is fixedly provided on one side of the center block. When the tip of the triangular block abuts against the tip of the correction groove, the limit cross plate is located at the middle position of the control end of the reversing valve. When the limit cross plate is located at the middle position, the upper limit seat and the lower limit seat are in a vertical state.

5. The construction equipment hydraulic control system according to claim 4, characterized in that: A contraction groove is provided on one side of the correction seat, a linear driver 1 is installed inside the contraction groove, an output end of the linear driver 1 is fixedly connected to the correction block, and a pressure sensor is connected between the correction block and the inner wall of the contraction groove.

6. The construction equipment hydraulic control system according to claim 5, characterized in that: A main oil tank and a spare oil tank are provided on one side of the driving mechanism, and both the main oil tank and the spare oil tank are connected to a travel limit box. A second reversing valve is installed inside the travel limit box, and the second reversing valve is connected to the spare oil tank.

7. The construction equipment hydraulic control system according to claim 6, characterized in that: The oil supply end of the reversing valve 2 is provided with a reversing pipeline, the control end of the reversing valve 2 is provided with a control disk, a swing rod 2 is fixedly provided on the outer side of the control disk, and the swing rod 2 includes three states of upward tilting, horizontal and downward tilting. A tension spring is fixedly connected between the swing rod 2 and the reversing valve 2.

8. The construction equipment hydraulic control system according to claim 7, characterized in that: An automatic control mechanism is provided between the limit horizontal plate and the reversing valve 2. When the limit horizontal plate is in the upper limit state, the reversing valve 2 is opened to supply oil to the upper limit through the automatic control mechanism. When the limit horizontal plate is in the lower limit state, the reversing valve 2 is opened to supply oil to the lower limit through the automatic control mechanism.

9. The construction equipment hydraulic control system according to claim 8, characterized in that: The automatic control mechanism includes a touch seat, a rotating connecting block is installed on the touch seat, a fixed connecting frame is fixedly provided at one end of the limiting horizontal plate, the fixed connecting frame and the rotating connecting block are rotatably connected through a movable connecting frame, an upper stopper and a lower stopper are respectively installed at the top and bottom ends of the touch seat, the swing rod 2 is located between the upper stopper and the lower stopper, and a vertical guide mechanism is provided on one side of the touch seat.

10. The construction equipment hydraulic control system according to claim 9, characterized in that: The top and bottom ends of the touch seat are respectively provided with a through-port one and a through-port two, a mounting groove is provided in the middle of the touch seat, a mounting plate is provided on one side of the touch seat, a linear driver two is installed inside the mounting groove, and the output end of the linear driver two is fixedly connected to the mounting plate, the upper block and the lower block are respectively fixedly connected to the top and bottom ends of the mounting plate, and the upper block and the lower block are movably arranged inside the through-port one and the through-port two, respectively.

Images