RU2052096C1 - Hydraulic drive of drilling rig - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: enhanced functional efficiency over the whole range of rotation frequencies of working tool is achieved by hydraulic and kinematic coupling of two additional hydraulic machines to high and low pressure line and of their shafts to shaft of second hydraulic machine which provides for similar value of ratio of flow of working fluid in main circuit and in replenishment circuit. EFFECT: enhanced functional efficiency. 2 cl, 1 dwg

Description

 The invention relates to mining, in particular to hydraulic drives of drilling rigs.

A well-known hydraulic drive of the drilling rig, containing the main pump, a hydraulic motor kinematically connected through a gear with the actuator of the installation, a compensation pump for leaks and hydraulic control [1]
A hydraulic drive of a drilling installation is known, comprising a drive motor, a first hydraulic machine of variable output connected to a drive motor, a second hydraulic machine kinematically connected via a planetary gearbox to the actuator of the installation, a leakage compensation pump.

 The disadvantage of these inventions is the low efficiency over the entire range (except the maximum value) of the rotational speed of the actuator, since when the rotational speed of the actuator decreases, the flow rate of the working fluid in the main circuit decreases, and the flow rate of the working fluid in the make-up circuit remains constant.

 The objective of the invention is to increase the efficiency of the hydraulic drive in the entire range of frequencies of rotation of the Executive body of the drilling rig.

м³/рад где q объемная постоянная второй гидромашины, м³/рад;
k коэффициент обмена рабочей жидкости, 0 < k ≅ 1;
q_1,2 объемная постоянная каждой из дополнительных гидромашин, м³/рад;
i

передаточное отношение кинематической связи от вала одной дополнительной гидромашины ко второй гидромашине;
i₁=

передаточное отношение кинематической связи от вала другой дополнительной гидромашины ко второй гидромашине; здесь: ω₁ частота вращения одной дополнительной гидромашины, с^-1;
ω₂ частота вращения другой дополнительной гидромашины, с^-1;
ω частота вращения второй гидромашины, с^-1.To solve this problem, the known hydraulic actuator containing a driving motor, a first variable-speed hydraulic machine connected to a driving motor, a second hydraulic machine kinematically connected through a planetary gearbox to the drilling rig executive unit, a leak compensation pump and control hydraulic equipment, are equipped with two additional hydraulic machines, each of which hydraulically connected to the lines of high and low pressure, and their shafts are kinematically connected to the shaft of the second hydraulic machine, with I eat a constant volume of each quantity of additional hydraulic defined as the ratios
q _1,2 = q

m ³ / rad where q is the volumetric constant of the second hydraulic machine, m ³ / rad;
k is the fluid exchange coefficient, 0 <k ≅ 1;
q _1.2 volumetric constant of each of the additional hydraulic machines, m ³ / rad;
i

gear ratio of the kinematic connection from the shaft of one additional hydraulic machine to the second hydraulic machine;
i ₁ =

gear ratio of the kinematic connection from the shaft of another additional hydraulic machine to the second hydraulic machine; here: ω ₁ frequency of rotation of one additional hydraulic machine, s ^-1 ;
ω ₂ frequency of rotation of another additional hydraulic machines, s ^-1 ;
ω rotation frequency of the second hydraulic machine, s ^-1 .

 The presence of two additional hydraulic machines and their corresponding hydraulic and kinematic connections with the high and low pressure lines of the liquid, as well as with the shaft of the second hydraulic machine, provide the same ratio of the flow rate of the working fluid in the main circuit (hydraulic lines of the first and second hydraulic machines) and in the make-up circuit (low pressure lines and drainage of additional hydraulic machines), which allows to obtain a high drive efficiency in the entire range of rotational speeds of the shaft of the second hydraulic machine.

 Thus, all the distinguishing features of the invention are interconnected, and only their combination provides a solution to the problem. When conducting a patent search, no known technical solutions having the differences indicated in comparison with the prototype were found.

 The drawing shows a schematic diagram of the hydraulic drive of the drilling rig.

 The hydraulic drive of the drilling rig contains a drive motor 1, a first hydraulic machine 2 of adjustable capacity connected to the drive motor, a second hydraulic machine 3, a shaft 4 of which is connected through an input link 5 of the planetary gearbox 6 with the actuator 7 of the drilling rig, additional hydraulic machines 8, 9. Workers the cavities of the hydraulic machines 2 and 3 are hydraulically connected to each other by the hydraulic lines 10 and 11. The additional hydraulic machines 8 and 9, by their injection lines 12 and 13, are respectively hydraulically connected to the hydraulic valves “And” 14 and 15 by lines 10 and 11, and by their lines 16 and 17 through coolers 18 and 19 with a drain 20. The shafts of each additional hydraulic machine 8 and 9 are kinematically connected with the shaft 4 of the second hydraulic machine 3, for example, by means of a gear transmission 21. A leak compensation pump 22 through hydraulic lines low pressure 23 is connected through check valves 24 and 25, installed in the direction of flow of the working fluid, with hydraulic lines 10 and 11, and through pressure valve 26 with drain 20. Safety valves 27 and 23 are installed between hydraulic lines 10 and 11.

, м³/рад; в результате чего КПД привода равен
η

где Р_н величина номинального давления жидкости в основном контуре, Па;
Р_под величина давления жидкости в контуре подпитки, Па.The hydraulic drive of the drilling rig operates as follows. The second hydraulic machine 3 and kinematically associated additional hydraulic machines 8 and 9 receive rotation depending on the productivity and the flow direction of the working fluid of the first hydraulic machine 2. When the direction of rotation of the shaft 4 of the hydraulic machine 3, corresponding to the high pressure in the hydraulic line 11, the first hydraulic machine 2 operates in pump, and the second hydraulic machine 3 in the motor mode, while the And 15 valve connects the hydraulic line 10 from the side of the hydraulic machine 3 through the hydraulic lines 13, the additional hydraulic machine 9, the hydraulic line 17, the cooler working bone 19 with drain 20, wherein the additional hydraulic machine motor 9 is in operation. At the same time, the And valve 14 connects the hydraulic lines 10 from the side of the hydraulic machine 2 through the hydraulic lines 12, an additional hydraulic machine 8, a hydraulic line 16, a fluid cooler 18 with a drain 20, and the additional hydraulic machine 8 operates in pump mode. When the direction of rotation of the shaft 4, corresponding to the high pressure in the hydraulic line 10, the additional hydraulic machine 9 operates in pump mode, and the hydraulic machine 8, respectively, in motor mode. To ensure the same ratio of the flow rate of the working fluid in the main circuit and in the make-up circuit at given values of the working fluid exchange coefficient k, the volumetric constant of the second hydraulic machine 3 q, and also the gear ratios of the gear train 21 i, the volumetric constant of each of the additional machines is
q _1,2 = q

, m ³ / rad; whereby the drive efficiency is
η

where P _{n the} value of the nominal fluid pressure in the main circuit, Pa;
P _{under the} magnitude of the fluid pressure in the make-up circuit, Pa.

Таким образом, гидропривод имеет одинаково высокий КПД во всем диапазоне частот вращения исполнительного органа независимо от направления вращения вала 4 гидромашины 3.After transformations of the above equality, we obtain
η

Thus, the hydraulic drive has an equally high efficiency in the entire range of frequencies of rotation of the executive body, regardless of the direction of rotation of the shaft 4 of the hydraulic machine 3.

Claims (2)

 1. HYDRAULIC DRILLING RIG, comprising a driving motor, a first variable-speed hydraulic machine connected to a driving motor, a second hydraulic machine kinematically connected through a planetary gearbox to the actuator of the drilling installation, a leakage compensation pump, characterized in that the hydraulic drive is equipped with two additional hydraulic machines, each of which are hydraulically connected to the lines of high and low pressure, and their shafts are kinematically connected with the shaft of the second hydraulic machine. 2. The hydraulic actuator according to claim 1, characterized in that the volume constant of each of the additional hydraulic machines is determined by the following ratio:

where q is the volume constant of the second hydraulic machine, m ³ / rad;
K is the exchange coefficient of the working fluid, 0 <K ≅ 1;
Q _{1 , 2} is the volume constant of each of the additional hydromash, m ³ / rad;

- gear ratio of the kinematic connection from the shaft of one additional hydraulic machine to the second hydraulic machine;

- the gear ratio of the kinematic connection from the shaft of another additional hydraulic machine to the second hydraulic machine, where w ₁ is the rotation frequency of one additional hydraulic machine, s ^{- 1} ; ω ₂ is the rotational speed of another additional hydraulic machine, s ^{- 1} , ω is the rotational speed of the second hydraulic machine, s ^{- 1} .

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