SU1294313A2 - Hydraulic drive of gripping and cutting member for tree-harvesting machine - Google Patents

Abstract

The invention relates to hydraulic actuators and is an improvement of the invention according to. No. 554843. The purpose of the invention is to increase the resource and efficiency. To the cavities 21–24 of the return control: .1 hydraulically controlled valves 17–20, an additional pressure source 29 is connected through the controllable locking element 30. As a source of 29 m. The transmission control pump 31 is used. When loading a sawn tree, the locking element 30 is connected, jointly with the cavities 21-24 with the pump 31. The hydraulic cylinders 2 and 3 of the inclination mechanism and the rolls are placed in a floating position, ensuring the free inclination of the gripping-cutting organ, which reduces the load in the design of both the organ itself and the manipulator. The transfer of the hydraulic cylinders 2 and 3 to the floating position requires little power. 1 il. (L GS Co) 00 00 INJ

Description

eleven

The invention relates to hydraulic drives of forest machines and is an improvement of the device according to ed. No. 554843.

The purpose of the invention is to increase the resource of the hydraulic drive and the efficiency of its work.

The drawing shows a diagram of the hydraulic gripping-cutting organ of a logging machine.

The hydraulic drive contains a hydraulic cylinder 1 of the gripping device, a hydraulic cylinder 2 of the tilt mechanism of the gripping and cutting device in the vertical plane, and a hydraulic cylinder 3 of the rolls of the sawn tree. These hydraulic cylinders are connected through hydraulic distributors 4-6 to the supply and drain lines, respectively, by means of pipelines 7-9 and 10-12.

The piston cavities 13 and 14 and the rod cavities 15 and 16 of the hydraulic cylinders 2 and 3 are connected to the drain via hydraulic backflow valves 17-20 of the control cavity 21-24, which communicate through the pressure slide valve 25 to the working cavity 26 of the hydraulic cylinder 1 of the gripper and throttle 27 with a drain. The hydraulic cylinder 1 of the gripping device is kinematically connected to the jaw 28 of the machine. Furthermore, the control cavities 21-24 are additionally connected to an additional pressure source 29 via a controlled locking element 30. As an additional pressure source 29, a machine transmission control 31 can be used lines 32 of which are installed actuators 33, in the drain line 34 of which is installed: the locking element 30. Additionally, line 34 is connected to the drain of valve 35.

The hydraulic actuator works as follows.

Pick-cutting body

the preparatory machine is brought to the tree with the help of a hydraulic manipulator so that it is located in the gripping zone. Preliminary orientation of the grip and its fixation are carried out by the tilt cylinders 2 and rollers 3. Turning on the hydraulic distributor 6 directs the working fluid through the pipeline 7 to the working cavity 26 of the hydraulic cylinder of the grip and pro- duce.

five

ABOUT

ABOUT

five

0

five

0

„

132

dt clamp wood. At the same time, the working fluid is supplied to the spool 25, which, at a certain pressure value, opens and passes it in the control cavity 21-24 and through the throttle 27 to the drain. Due to the back pressure created by the throttle 27, the pressure in the cavities 21 to 24 of the control valves of the check valves 17 to 20 increases. Under the action of this pressure, the valves open and communicate with the drain and between themselves the piston 13 and 14 and the rod 15 and 16 of the hydraulic cylinders

2 and 3, i.e. these cylinders are automatically set to a floating position when clamping wood.

, When translating hydraulic cylinders 2 and

3c, the floating position ensures complete adherence of the gripping body to the tree and secure grip of the latter.

At the end of the clamping operation, when the hydraulic cylinder 1 is set by turning on the hydraulic distributor 6 to the locked position, the pressure valve 25 closes, the pressure in the control valve cavity 21-24 of the check valves 17-20 drops, the valves close and separate the working cavities of the hydraulic cylinders 2 and 3 between themselves and the drain. . The hydraulic cylinders 2 and 3 are in the locked position.

The roll of the sawn tree is carried out by supplying fluid from the hydraulic distributor 5 to the cavity 14 of the hydraulic cylinder 3.

After the rolls, the cut tree remains clamped in the gripping and cutting organ and in this state is loaded onto the logging machine. At the same time, the tilt 2 and rolls 3 cylinders are again floated by turning on the locking element 30, blocking the passage of the oil flow from the transmission control pump 31 to draining and guiding it in cavities 21 - 24. control of check valves 17 - 20. Valve 35 limits the maximum pressure in line 34. Tilt 2 hydraulic cylinders and rolls 3 are set to float position, as a result The free inclination of the gripping-cutting organ occurs, which significantly reduces the load on the structure 31943134

Claims (1)

of the organ itself, and the manipula of the formula of the invention of the torus in the process of loading wood. Hydraulic gripping-cutting. With the transfer to transfer the hydraulic cylinder of a logging machine, tilt and rolls is spent not. on avt.sv. No. 554843, about t of l and h is significant hydraulic power, so that, with the aim of raising the height of its resource and efficiency work, it is equipped with a controlled flow control, as the loading of the wood is a porous element and an additional Filled with hydro power off, connected the drive of capture, profitability and tO through, this locking element to a strip - Hydraulic age of life — from m to control of reverse hydraulically controlled valves.