Main control valve of hoisting machinery

Abstract

The utility model discloses a hoisting machinery main control valve, and relates to the technical field of hoisting machinery main control valves. The top of the oil conveying pipe is movably connected with a top cover, the top cover is sleeved with a pressure relief piece, the top of the lead screw is fixedly connected with an adjusting screw, one end of the top of the valve deck is fixedly connected with a second oil conveying pipe, and the top of the second oil conveying pipe is fixedly connected with a pressure detector. The top cover continuously ascends, the bottom of the inner cavity abuts against the bottom of the cavity of the pressure relief piece, hydraulic oil in the cavity of the pressure relief piece is squeezed into the cavity of the valve deck through the oil conveying hole, the top cover abuts against the pressure relief piece and then drives the pressure relief piece to continue upwards to compress the hydraulic oil in the cavity of the valve deck, and pressure information is transmitted to a pressure detector through a second oil conveying pipe. And the pressure detector is used for early warning the hydraulic oil in the valve body, so that the pressure condition of the hydraulic oil in the valve body can be visually seen through the pressure detector, and a response can be made in time.

Description

Technical Field

[0001] The utility model relates to the technical field of main control valves of lifting machinery, in particular to a main control valve of lifting machinery. Background Art

[0002] Lifting machinery refers to electromechanical equipment used for vertical lifting or vertical lifting and horizontal movement of heavy objects. Its scope is defined as elevators with a rated lifting capacity greater than or equal to 0.5t; cranes with a rated lifting capacity greater than or equal to 3t (or tower cranes with a rated lifting torque greater than or equal to 40t·m, or loading and unloading bridges with a productivity greater than or equal to 300t / h), and a lifting height greater than or equal to 2m; mechanical parking equipment with more than or equal to 2 floors. In lifting machinery, hydraulic safety valves are essential. However, the existing hydraulic safety valves are not very effective. Failure to relieve pressure in a timely manner may cause valve damage. General safety valves can directly relieve pressure, but they cannot play a warning role, and there is a problem that the safety valve cannot adjust the pressure it bears. Content of the Utility Model

[0003] In view of the deficiencies of the prior art, the utility model provides a main control valve for lifting machinery, which solves the problems that the existing hydraulic safety valves are not very effective, general safety valves can directly relieve pressure, but cannot play a warning role, and there is a problem that the safety valve cannot adjust the pressure it bears.

[0004] To achieve the above objectives, the utility model is realized through the following technical solutions: a main control valve for lifting machinery. It includes a valve body. A fuel delivery pipe is fixedly connected to the bottom inner cavity of the valve body. The top of the fuel delivery pipe is movably connected to a top cover. A pressure relief member is sleeved outside the top cover. An oil delivery hole is opened at the top inner cavity of the pressure relief member. A valve cover is fixedly connected to the top of the valve body. A lead screw is rotatably connected to the top inner cavity of the valve cover. The top of the lead screw is fixedly connected to an adjusting screw. One end of the top of the valve cover is fixedly connected to a second fuel delivery pipe. A pressure detector is fixedly connected to the top of the second fuel delivery pipe.

[0005] Preferably, a base is fixedly connected to the bottom of the valve body, and a pressure relief pipe is opened on the side of the valve body.

[0006] Preferably, a guide sleeve is fixedly connected to the top of the pressure relief member, and the lead screw is rotatably connected inside the guide sleeve.

[0007] Preferably, a telescopic spring is fixedly connected to the top of the pressure relief member, and the telescopic spring is sleeved outside the guide sleeve and the lead screw.

[0008] Preferably, the adjusting screw is movably connected to the top of the valve cover.

[0009] Preferably, the top cover is snap-fitted inside the cavity of the pressure relief member, and the top cover is movably connected in the cavity.

[0010] Preferably, the inner cavity of the valve cover is rectangular, and the cross-section of the pressure relief member is rectangular. Advantages

[0011] The utility model provides a main control valve for a hoisting machine. Compared with the prior art, the following advantages are achieved:

[0012] 1. For the main control valve of the hoisting machine, hydraulic oil enters the inside of the oil delivery pipe to push up the top cover. The top cover continuously rises, and the bottom of the inner cavity abuts against the bottom of the cavity of the pressure relief member, squeezing the hydraulic oil in the cavity of the pressure relief member into the cavity of the valve cover through the oil delivery hole. After the top cover abuts against the pressure relief member, it drives the pressure relief member to continue to move upward to compress the hydraulic oil in the cavity of the valve cover, and transmits the pressure information to the pressure detector through the second oil delivery pipe. The pressure detector warns of the hydraulic oil inside the valve body, and it is possible to intuitively see the pressure condition of the hydraulic oil inside the valve body through the pressure detector and make a timely response.

[0013] 2. For the main control valve of the hoisting machine, by screwing the adjusting screw, when the lead screw fixedly connected to the bottom of the adjusting screw rotates, under the guiding action of the guiding sleeve arranged at the bottom, the pressure relief member rises. After the pressure relief member rises, the bottom disengages from the top of the oil delivery pipe, forming a pressure relief channel between the oil delivery pipe and the pressure relief pipe, which can relieve the pressure of the hydraulic valve. Similarly, by rotating the adjusting screw, the length of the lead screw in the cavity of the pressure relief member is changed, thereby changing the pressure that the main control valve can withstand. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a sectional view of the overall structure of the utility model.

[0016] Figure 3 It is an exploded view of the overall structure of the utility model.

[0017] Figure 4 It is a schematic diagram of the side structure of the utility model.

[0018] In the figure: 1. Valve body; 2. Valve cover; 3. Pressure relief pipe; 4. Oil delivery pipe; 5. Top cover; 6. Pressure relief member; 7. Guiding sleeve; 8. Lead screw; 9. Telescopic spring; 10. Adjusting screw; 11. Second oil delivery pipe; 12. Pressure detector; 13. Oil delivery hole; 14. Base. Detailed Embodiments

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-4 , the present utility model provides a technical solution: a master control valve for a hoisting machine. It includes a valve body 1. At the bottom of the inner cavity of the valve body 1, an oil delivery pipe 4 is fixedly connected. After the pressure in the pipeline increases, hydraulic oil enters the interior of the valve body 1 through the oil delivery pipe 4. The top of the oil delivery pipe 4 is movably connected to a top cover 5. An overpressure relief component 6 is sleeved outside the top cover 5. The top cover 5 is pressed upward by the extrusion of the hydraulic oil against the bottom of the cavity of the overpressure relief component 6. An oil delivery hole 13 is opened at the top of the inner cavity of the overpressure relief component 6. The hydraulic oil originally existing in the cavity of the overpressure relief component 6 enters the interior of the valve cover 2 through the oil delivery hole 13. The top of the valve body 1 is fixedly connected to a valve cover 2. A lead screw 8 is rotatably connected to the top of the inner cavity of the valve cover 2. The top of the lead screw 8 is fixedly connected to an adjusting screw 10. One end of the top of the valve cover 2 is fixedly connected to a second oil delivery pipe 11. The top of the second oil delivery pipe 11 is fixedly connected to a pressure detector 12. After the hydraulic oil in the inner cavity of the overpressure relief component 6 enters the valve cover 2, the hydraulic oil inside the valve cover 2 is under pressure, and the pressure of the hydraulic oil inside the second oil delivery pipe 11 increases. The pressure detector 12 can give an early warning of the hydraulic pressure of the master control valve. The pressure detector 12 is a kind of pressure sensor. A hydraulic sensor usually consists of an elastic diaphragm, a piston with a loading platform, oil or water inside the piston, and a Bourdon tube pressure gauge. When pressure is applied to the second oil delivery pipe 11 through hydraulic oil, the pressure of the liquid increases in proportion to the applied force or weight. After calibrating the pressure, the force or weight applied to the pressure detector 12 can be accurately measured.

[0021] The bottom of the valve body 1 is fixedly connected to a base 14. A relief pipe 3 is provided on the side of the valve body 1. When the adjusting screw 10 drives the lead screw 8 to rotate, the bottom of the inner cavity of the overpressure relief component 6 disengages from the top of the oil delivery pipe 4, and the hydraulic oil can be discharged through the relief pipe 3. The top of the overpressure relief component 6 is fixedly connected to a guide sleeve 7. The lead screw 8 is rotatably connected inside the guide sleeve 7. The top of the overpressure relief component 6 is fixedly connected to a telescopic spring 9. The telescopic spring 9 is sleeved outside the guide sleeve 7 and the lead screw 8. The adjusting screw 10 is movably connected to the top of the valve cover 2. The top cover 5 is clamped inside the cavity of the overpressure relief component 6, and the top cover 5 is movably connected in the cavity. The inner cavity of the valve cover 2 is rectangular, and the cross-section of the overpressure relief component 6 is rectangular, so that when the adjusting screw 10 rotates the lead screw 8 fixedly connected to the bottom, the overpressure relief component 6 will not rotate together due to its own shape.

[0022] Please refer to Figures 1-4, during use, when the main control valve gives a warning about the hydraulic pressure, the hydraulic oil enters the interior of the oil delivery pipe 4 and pushes up the top cover 5. The top cover 5 continuously rises and the bottom of its inner cavity abuts against the bottom of the cavity of the pressure relief component 6, squeezing the hydraulic oil in the cavity of the pressure relief component 6 into the cavity of the valve cover 2 through the oil delivery hole 13. After the top cover 5 abuts against the pressure relief component 6, it drives the pressure relief component 6 to continue rising to compress the hydraulic oil in the cavity of the valve cover 2, and transmits the pressure information to the pressure detector 12 through the second oil delivery pipe 11. The pressure detector 12 gives a warning about the hydraulic oil inside the valve body 1, and it can visually see the pressure condition of the hydraulic oil inside the valve body 1 through the pressure detector 12 and make a timely response; when pressure relief is required, turn the adjusting screw 10. When the lead screw 8 fixedly connected to the bottom of the adjusting screw 10 rotates, under the guiding action of the guide sleeve 7 arranged at the bottom, the pressure relief component 6 rises. After the pressure relief component 6 rises, the bottom disengages from the top of the oil delivery pipe 4, forming a pressure relief channel between the oil delivery pipe 4 and the pressure relief pipe 3, which can relieve the pressure of the hydraulic valve. At the same time, turning the adjusting screw 10 changes the length of the lead screw 8 in the cavity of the pressure relief component 6, and the pressure that the main control valve can withstand can be changed.

[0023] In this embodiment, for the main control valve of the hoisting machinery, among the above components, its own structural features and working principles all adopt the prior art and will not be elaborated here.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0025] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main control valve for a lifting machine, comprising a valve body (1), characterized in that: The bottom of the bottom inner cavity of the valve body (1) is fixedly connected to an oil delivery pipe (4), the top of the oil delivery pipe (4) is movably connected to a top cover (5), the outer portion of the top cover (5) is sleeved with a pressure relief member (6), the inner cavity top of the pressure relief member (6) is provided with an oil delivery hole (13), the top of the valve body (1) is fixedly connected to a valve cover (2), the inner cavity top of the valve cover (2) is rotatably connected to a screw rod (8), the top of the screw rod (8) is fixedly connected to an adjusting screw (10), one end of the top of the valve cover (2) is fixedly connected to a second oil delivery pipe (11), and the top of the second oil delivery pipe (11) is fixedly connected to a pressure detector (12).

2. The main control valve for lifting machinery according to claim 1, characterized in that: The bottom of the valve body (1) is fixedly connected to a base (14), and a pressure relief pipe (3) is provided on the side of the valve body (1).

3. The main control valve for lifting machinery according to claim 1, characterized in that: The top of the pressure relief member (6) is fixedly connected to a guide sleeve (7), and the screw rod (8) is rotatably connected to the inside of the guide sleeve (7).

4. The main control valve for lifting machinery according to claim 3, characterized in that: A telescopic spring (9) is fixedly connected to the top of the pressure relief member (6), and the telescopic spring (9) is sleeved on the outside of the guide sleeve (7) and the screw rod (8).

5. The main control valve for lifting machinery according to claim 1, characterized in that: The adjusting screw (10) is movably connected to the top of the valve cover (2).

6. The main control valve for lifting machinery according to claim 2, characterized in that: The top cover (5) is clamped inside the cavity of the pressure relief member (6), and the top cover (5) is movably connected in the cavity.

7. The main control valve for lifting machinery according to claim 5, characterized in that: The inner cavity of the valve cover (2) is rectangular, and the cross-section of the pressure relief member (6) is rectangular.

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