阅读说明：本技术 一种主卷扬平衡阀组 (Main winch balance valve group ) 是由 何祥华 邓超兵 于 2019-12-08 设计创作，主要内容包括：本发明公开了一种主卷扬平衡阀组,包括第一梭阀、主阀过来的第一液压油入口P1和主阀过来的第二液压油入口P2；第一梭阀分别连通有主卷平衡阀组BR、主卷开锁阀和主卷扬减速机制动缸；所述主阀过来的第一液压油入口P1连通有第二梭阀和平衡阀；第二梭阀依次连通减压阀、顺序阀和主卷平衡阀组BR；平衡阀连通有液压马达A口,液压马达B口连通有主阀过来的液压油入口P2。本发明阀组外形尺寸为255×140×93,重量约为26公斤,和传统平衡阀组相比,外形尺寸有所减少,减重20％,降低了加工成本和外购件成本。将顺序阀5放在减压阀4后面,保证减压后减压阀出口液压油全部进入制动缸,更能确保制动和解除制动可靠,减少了故障隐患,具有较大的推广价值。(The invention discloses a main hoisting balance valve group, which comprises a first shuttle valve, a first hydraulic oil inlet P1 from a main valve and a second hydraulic oil inlet P2 from the main valve; the first shuttle valve is respectively communicated with a main winding balance valve group BR, a main winding unlocking valve and a main winding speed reducer brake cylinder; the first hydraulic oil inlet P1 from the main valve is communicated with a second shuttle valve and a balance valve; the second shuttle valve is communicated with the pressure reducing valve, the sequence valve and the main winding balance valve group BR in sequence; the balance valve is communicated with a hydraulic motor A port, and a hydraulic motor B port is communicated with a hydraulic oil inlet P2 from a main valve. The valve bank has the overall dimension of 255 multiplied by 140 multiplied by 93 and the weight of about 26 kilograms, and compared with the traditional balance valve bank, the valve bank has the advantages that the overall dimension is reduced, the weight is reduced by 20 percent, and the processing cost and the outsourcing part cost are reduced. The sequence valve 5 is placed behind the pressure reducing valve 4, so that hydraulic oil at an outlet of the pressure reducing valve can be ensured to completely enter a brake cylinder after pressure reduction, reliable braking and brake release can be ensured, potential fault hazards are reduced, and the method has a high popularization value.)

1. A main hoisting balance valve group is characterized by comprising a first shuttle valve (1), a first hydraulic oil inlet (P1) and a second hydraulic oil inlet (P2), wherein the first hydraulic oil inlet (P1) is in main valve connection with the main valve; the first shuttle valve (1) is respectively communicated with a main winding balance valve (BR), a main winding unlocking valve (8) and a main winding speed reducer brake cylinder (7); a first hydraulic oil inlet (P1) from the main valve is communicated with a second shuttle valve (3) and a balance valve (2); the second shuttle valve (3) is communicated with the pressure reducing valve (4), the sequence valve (5) and the main coil balance valve (BR) in sequence; the balance valve (2) is communicated with a hydraulic motor A port, and a hydraulic motor B port is communicated with a second hydraulic oil inlet (P2) which is in main valve connection.

2. The main hoist balancing valve group according to claim 1, characterized in that the hydraulic motor communicates with the floating directional valve (6), and the floating directional valve (6) communicates with MB, MA and the pressure reducing valve (4).

3. The main winding balancing valve group according to claim 2, characterized in that the floating directional valve (6) is a two-position three-way directional valve.

4. The main winding balancing valve group according to claim 2, characterized in that the pressure reducing valve (4) is a direct-acting pressure reducing valve.

5. The main hoisting balance valve group according to claim 1, wherein said MB and MA are respectively connected to a one-way relief valve (9), and the one-way relief valve (9) is connected to an oil supply port (S).

6. The main winch balancing valve group of claim 1, wherein when a main winch needs to be lowered, and a brake of a main winch speed reducer needs to be opened, hydraulic oil from a main valve enters a brake cylinder (7) of the main winch speed reducer through a first hydraulic oil inlet (P1) of the main valve via a main valve, a part of the hydraulic oil enters the brake cylinder (7) of the main winch speed reducer from an opening A of a balancing valve (2) via a second shuttle valve (3), a pressure reducing valve (4), a sequence valve (5) and a first shuttle valve (1) to open the main winch speed reducer, and the other part of the hydraulic oil enters an opening A of a hydraulic motor via the balancing valve (2), and return oil directly passes through a main valve oil return tank from an opening B of the hydraulic motor, so that the.

7. The main winch balancing valve group of claim 6, wherein when the main winch needs to realize a lifting operation, hydraulic oil from the main valve is switched to the port B of the balancing valve (2) through the first hydraulic oil inlet (P2) from the main valve, a part of the hydraulic oil rapidly enters the brake cylinder (7) of the main winding speed reducer through the second shuttle valve (3), the pressure reducing valve (4), the sequence valve (5) and the first shuttle valve (1) to open the main winding speed reducer, the other part of the hydraulic oil enters the port B of the hydraulic motor through the balancing valve (2), and return oil directly passes through a main valve oil return tank from the port A of the hydraulic motor, so that the lifting function of the main winch is realized.

The technical field is as follows:

the invention relates to the field of engineering machinery, in particular to a rotary drilling rig main winch balance valve bank with reliable braking and braking releasing performance.

Background art:

the main winch of the rotary drilling rig is a mechanism for completing functions of lowering and lifting a drill rod and a drill bit in a drilling process, is driven by a hydraulic motor and is controlled by a hydraulic pilot, and mainly comprises a main winch hydraulic motor, a main winch speed reducer, a winding drum and a main winch balance valve assembly. In the working process, the main valve provides hydraulic oil for the main winch motor, and in order to prevent the main winch from stalling and descending and protect equipment and personnel safety, a main winch balance valve group is required to be added.

However, the conventional main winch balance valve block of the conventional rotary drilling rig is huge in appearance and inconvenient to install and maintain, meanwhile, a sliding rod phenomenon caused by failure of a balance valve is often found in construction, and the balance valve is mostly caused by overflow failure of a buffer overflow valve of a balance valve component after maintenance of the balance valve; meanwhile, the main coil is provided with a secondary overflow valve as a buffer valve, so that the buffer overflow valve added by the design of the balance valve component is harmful and useless, and can be completely eliminated.

The noun explains:

MA: the floating port A is provided with a floating port A,

MB: and a floating port B.

The invention content is as follows:

the invention aims to provide a main winch balance valve bank, the overall dimension of the valve bank is 255 multiplied by 140 multiplied by 93, the weight of the valve bank is about 26 kilograms, compared with the traditional balance valve, the overall dimension is reduced, the weight is reduced by 20 percent, and the processing cost and the outsourcing part cost are reduced. The reversing valve is arranged behind the pressure reducing valve, so that hydraulic oil at the outlet of the pressure reducing valve can be ensured to completely enter the brake cylinder after pressure reduction, reliable braking and brake release can be ensured, the fault hidden danger is reduced, and the method has great popularization value.

In order to solve the problems, the technical scheme of the invention is as follows:

a main hoisting balance valve group comprises a first shuttle valve 1, a first hydraulic oil inlet P1 from a main valve and a second hydraulic oil inlet P2 from the main valve; the first shuttle valve 1 is respectively communicated with a main winding balance valve BR, a main winding unlocking valve 8 and a main winding speed reducer brake cylinder 7; the first hydraulic oil inlet P1 from the main valve is communicated with a second shuttle valve 3 and a balance valve 2; the second shuttle valve 3 is communicated with a pressure reducing valve 4, a sequence valve 5 and a main coil balance valve BR in sequence; the balance valve 2 is communicated with a hydraulic motor A port, and a hydraulic motor B port is communicated with a second hydraulic oil inlet P2 from a main valve.

In a further improvement, the hydraulic motor is communicated with a floating reversing valve 6, and the floating reversing valve 6 is communicated with MB, MA and a pressure reducing valve 4.

In a further improvement, the floating reversing valve 6 is a two-position three-way reversing valve.

In a further improvement, the pressure reducing valve 4 is a direct-acting pressure reducing valve.

In a further improvement, the MB and MA are respectively communicated with a one-way overflow valve 9, and the one-way overflow valve 9 is communicated with an oil supplementing port S.

In order to further improve the descending action of the main winch, when a brake of a speed reducer of the main winch needs to be opened, hydraulic oil from a main valve passes through a first hydraulic oil inlet P1 from the main valve, a part of the hydraulic oil enters a brake cylinder 7 of the main winch speed reducer from an opening A of a balance valve 2 through a second shuttle valve 3, a pressure reducing valve 4, a sequence valve 5 and a first shuttle valve 1 to open the main winch speed reducer, the other part of the hydraulic oil enters an opening A of a hydraulic motor from the balance valve 2, and return oil directly passes through an oil return tank of the main valve from an opening B of the hydraulic motor, so that the descending function of the main winch is realized.

In a further improvement, when the main winch needs to realize a lifting action, when hydraulic oil from a main valve is switched to a port B of a balance valve 2 through a first hydraulic oil inlet P2 from the main valve, a part of the hydraulic oil rapidly enters a brake cylinder 7 of a main winding speed reducer through a second shuttle valve 3, a pressure reducing valve 4, a sequence valve 5 and a first shuttle valve 1 to open the main winding speed reducer, the other part of the hydraulic oil enters a port B of a hydraulic motor from the balance valve 2, and return oil directly passes through a main valve oil return tank from a port A of the hydraulic motor, so that the lifting function of the main winch is realized.

The invention has the advantages that:

1) two overflow valves of the original balance valve group are eliminated, and the two overflow valves of the main coiling motor are used as buffer valves, so that the cost is saved, the occupied space is reduced, and the fault probability is reduced.

2) a reversing valve of the balance valve group is arranged behind the pressure reducing valve, so that hydraulic oil at an outlet of the pressure reducing valve can completely enter a brake cylinder after pressure reduction, and reliable braking and brake releasing can be ensured.

Drawings

FIG. 1 is a hydraulic schematic diagram of a main winch balancing valve group;

FIG. 2 is a schematic diagram of a practical three-dimensional structure of the balancing valve assembly of the present invention;

fig. 3 is a schematic front perspective view of the balanced valve assembly of the present invention.

The specific implementation mode is as follows:

in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1, which is a hydraulic schematic diagram of a main winch balance valve group, an oil inlet at one end of a shuttle valve 1 is hydraulic oil from a BR port of the main winch balance valve group, an oil inlet at the other end of the shuttle valve 1 is hydraulic oil from a main winch unlocking valve 8, an oil outlet of the shuttle valve 1 is communicated to a brake cylinder 7 of a main winch speed reducer, and a main winch speed reducer brake needs to be opened to realize lifting or descending actions. A part of hydraulic oil from a main valve passes through a first hydraulic oil inlet P1 from the main valve, rapidly enters a main winding speed reducer brake cylinder 7 from a port A of a balance valve group through a shuttle valve 3, a pressure reducing valve 4, a sequence valve 5 and a shuttle valve 1 to open the main winding speed reducer, the other part of hydraulic oil enters a hydraulic motor port A from a balance valve 2, and return oil directly passes through a main valve oil return tank from a port B of the hydraulic motor, so that the main winding lowering function is realized; similarly, when the hydraulic oil from the main valve is switched to the port B of the balance valve group through the second hydraulic oil inlet P2 from the main valve, a part of the hydraulic oil rapidly enters the brake cylinder 7 of the main winding speed reducer through the shuttle valve 3, the pressure reducing valve 4, the sequence valve 5 and the shuttle valve 1 to open the main winding speed reducer, the other part of the hydraulic oil enters the port B of the hydraulic motor through the balance valve 2, and the return oil directly passes through the main valve oil return tank from the port A of the hydraulic motor, so that the lifting function of the main winding is realized. When the rotary drilling rig cuts soil, the main winch is required to be in a free lowering state, in order to achieve the action, only the floating reversing valve 6 needs to be operated to reverse, the MA and the MB are in a connection state while the brake of the speed reducer is opened, and at the moment, the cavities of the motor A and the motor B are communicated with each other, and the main winch is achieved to be in free lowering by the self weight of a drill bit and a drill rod. In the figure, S is connected with an oil supplementing valve to realize low-pressure oil supplementing for the lifting and lowering actions of the main winch. And 9, a one-way overflow valve is used for limiting the highest working pressure of the main winding motor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.