SU1555477A1 - Hydraulic drive of rock drill - Google Patents

Abstract

The invention relates to mining technology. The purpose of the invention is to increase the productivity of the drilling machine by automatically maintaining the torque values and rotational speed of the drill at an optimum level. The hydraulic drive consists of a pump 1, a hydraulic motor (GM) 2 rotation of the drill and hydraulic cylinder 3 feed the drill. Pump 1 is adjustable and equipped with a pressure regulator 4. The controlled hydraulic clew 5 with a spring-loaded spool inputs is connected to the hydraulic distributor 6. The hydraulic distributor 6 inputs communicate with the pressure and drain hydraulic lines 8 and 9. The regulating hydraulic device is made of Drossel (D) 10 and connected to the output of the GM 2. Input D 10 is communicated with the output of the hydraulic distributor 6. The mechanisms 11 and 12 of the control of the hydraulic balancer 5 are hydraulic. The mechanism 11 is connected to the inlet of the GM 2. The mechanism 12 is connected to the hydroline 8. The outputs of the hydrosolder 5 are connected to the working cavities of the hydraulic cylinder 3. Structurally, D 10 can be made adjustable. As a result of the action of pressure and spring forces in mechanisms 11 and 12, the hydraulic axle 5 takes a certain position. In this position, the differential pressure on D 10 and the rotational speed of the GM 2 will be constant. When the load on the drill changes and the pressure at the inlet to GM 2, the pressure in the hydraulic line 8 will also change. The torque on the GM 2 and the drill is constant. Maintaining the rotational speed of the drill and the torque on it at a constant level at an optimal level improves the performance of the drilling machine. 1 hp f-ly, 1 ill.

Description

(21) 4300624 / 24-03

(22) 08/31/87

(46) 04/07/90. Bul № 13

(71) Institute of Mining them, A.A. Skochinsky

(72) M.M.Averbukh, S.V. Blumin and V.M.Goldin

(53) 622.233.62 (088.8)

(56) USSR Copyright Certificate No. 595504, cl. E 21 C 5/08, 1978,

USSR Author's Certificate No. 1328508, cl. E 21 C 5/08, 1986.

(54) DRILLING MACHINE

(57) The invention relates to mining machinery. The purpose of the invention is to increase the productivity of the drilling machine due to the automatic maintenance of the torque values.

and the rotational speed of the drill at an optimal level. The hydraulic actuator consists of

pump 1, hydraulic motor (GM) 2 rotation of the drill and hydraulic cylinder 3 feed the drill. Pump 1 is adjustable and equipped with a pressure regulator 4. The controlled hydraulic clew 5 with spring-loaded spool inputs is connected to the hydraulic distributor 6 outputs. The hydraulic distributor 6 inputs communicate with the pressure and drain hydraulic lines 8 and 9t. The regulating hydraulic device is made of throttles (D) 10 and connected with an output to the GM 2 input, Input D 10 communicated with the output of the hydraulic distributor 6, the mechanisms 11 and 12 of the control of the hydraulic hammer 5 are made hydraulic. Mechanism I1 is connected to the GM 2 input, Mechanism 12 is connected to the hydraulic lines 8, Outputs of the hydraulic spool 5 are connected to the working cavity of the hydraulic cylinder 3, Constructive (/

JV JV 4) 1 1

but D 10 can be made adjustable. As a result of the action of pressure and spring forces in mechanisms 11 and 12, the hydraulic ram 5 takes a certain position. In this position, the pressure drop on D 10 and the rotational speed of the GM 2 will be constant. When changing the load on the drill and pressure, the Invention relates to the mining industry and can be used in the hydraulic drives of drilling machines.

The purpose of the invention is to increase machine productivity by automatically maintaining the torque values and rotational speed of the drill at an optimum level.

The drawing shows a diagram of the hydraulic drilling machine.

The hydraulic drive of the drilling machine consists of the pump 1, the hydraulic motor 2 of rotation of the drill and the hydraulic cylinder 3 of the feed of the drill. The pump 1 is made adjustable and equipped with a pressure regulator 4. Managed hydraulic accumulator 5 with spring-loaded spool entrances through the keys to the hydraulic distributor 6 o. with the output of the hydraulic distributor 6. The mechanisms 11 and 12 of the control of the hydraulic hammer 5 are made hydraulic. The mechanism 11 is connected to the input of the hydraulic motor 2, the Mechanism 12 is connected to the pressure hydraulic line 8, the outlets of the hydraulic breather 5 are connected to the working cavity of the hydraulic cylinder 3. The choke 10 can be made adjustable.

The hydraulic actuator works as follows.

When the hydraulic distributor 7 is turned on in position c and hydraulic distributor 6 in position b, a rather slowly rotating drill is supplied to the bottom, which causes a slow increase in the load on the hydraulic motor 2 and pressure at its input, which ensures reliable

15554774

The pressure in the hydroline is also changed at the inlet to the GM 2. The torque on the GM 2 and the drill is constant. Maintaining the rotational speed of the drill and the torque on it at a constant level at an optimal level improves the productivity of the drilling machine, 1 hp. f-ly, 1 ill.

0

five

0

five

0

five

WITH

five

Drilling a drill at a given point on the bottom plane. At the same time, the oil control mechanism 11 receives hydraulic oil 5 under pressure proportional to the torque (load) on the drill and, consequently, on the hydraulic motor 2. As a result, three forces act on the hydraulic piston 5. Two of these three forces (one is proportional to the pressure at the inlet of the hydraulic motor 2, and the other is equal to the tension of the adjusting spring) act together in one direction in the direction of overlapping the position a lines and gradual transfer of the hydraulic ram 5 to position b and thus They lead to a decrease in the speed v of the tool feeding force to the bottomhole down to zero and further to the complete reversal of the tool from the bottom. The third of these forces, proportional to the pressure in the pressure line 8 (which is determined by the setting of the constant pressure regulator 4), acts against the first two forces and, therefore, tends to place the hydrogate spool 5 in the position. As a result of these three forces, the hydraulic seal 5 occupies a certain intermediate position at which the pressure drop across the throttle 10 is constant and proportional to the tension of the adjusting spring. In connection with the constant pressure differential, the flow rate of the working fluid through the choke 10, and hence the rotational speed of the hydraulic motor 2, is stable and is determined only by the adjustment of the adjusting spring of the hydraulic axle 5 and the value of the hydraulic resistance of the throttle 10.

After the drilling operation is completed, the valve 6 is included in position a. When this is shunted chokes in the valve 6,

which leads to an increase in the frequency of rotation of the motor 2 to a nominal value, as well as an increase in the feed rate of the drill. The drilling process of the hole begins. When drilling a borehole, the pressure drop at throttle 0 is strictly maintained in a similar way by using a hydraulic hammer 5 in the order described above, and the pressure drop at throttle 10 is constant even at the moments of jamming of the drill, since the hydraulic hammer 5, if necessary, not only reduces to zero the supply of the tool to the bottom, but also reverses it and restores the pressure drop set on the throttle 10 given by the adjusting spring of the hydrosolee 5. As a result, in this design of the hydraulic drive of the storm noy machine tool provided high stability rotational frequency and at the same time high stability of the torque on it,

To change the frequency of rotation of the tool when changing the drilling conditions, it is necessary to adjust the choke 10, which causes a change in the flow rate of the working fluid through the hydraulic motor 2 and a proportional change in the frequency of its rotation. When the rotational speed is changed, the torque on the drill remains unchanged, since the pressure drop across the throttle 10 is kept constant in the same way as the pressure in the hydraulic line 8, which means that the pressure in front of the hydraulic motor 2 is equal to the difference in the pressure hydraulic line The 8 values of the pressure drop across the throttle 10, as well as the torque on the hydraulic motor 2, which is proportional to the pressure at its inlet, remain constant. If it is necessary to change the magnitude of the torque on the drill, the setpoint of the regulator 4 should be changed so that, in the pressure line 8, the value is changed in the appropriate direction

0

standing pressure. At the same time, due to the constant pressure differential across the throttle 10, the pressure at the inlet of the motor 2 changes exactly by the amount of pressure change in the hydraulic line 8. However, the rotational speed of the drill remains unchanged.

As a result, due to the stability of the frequency of rotation of the drill and the torque on it, it is possible to significantly reduce the deviation of these parameters from their optimum values, which will improve the performance of the boring machine.

Claims (2)

1. The hydraulic actuator of the drilling machine, containing a pump, hydraulic distribution tel, pressure and drain hydrolines, hydraulic motor of rotation of the drill, hydraulic cylinder of the feed of the drill, controlled hydrospray with spring-loaded slide valve and with control mechanisms, connected by inputs to the outlets of the hydraulic distributor, the inputs of which are in communication with the pressure and discharge hydraulic lines, and a regulating hydraulic device connected by an outlet to the input of the hydraulic drill bit torus, characterized in that, in order to increase the productivity of the boring machine by automatically maintaining the magnitude of the torque and rotational speed of the drill at an optimal level, the pump is made adjustable and equipped with a pressure controller, the regulating hydraulic device is made of throttles, the input of which is communicated with the output of the hydraulic distributor, the control mechanisms of the hydraulic ash guard are made hydraulic, and one of the control mechanisms is connected to the input of the hydraulic motor of rotation of the drill, and On the other hand, to the pressure hydroline, while the outputs of the controlled hydraulic seal are connected to the working cavities of the hydraulic cylinder of the drill feed. 2. The hydraulic actuator according to claim 1, about tl and the fact that the choke is made adjustable.