Hydraulic Internal Vibrators for Big Dams VH-15 Serie Brochure

Hydraulic internal vibrator VH-15 • Specially designed for mass concrete pours with aggregate sizes of 150 mm or more. • High resistance to wear. Changeable head. • Registered revolving device, increasing the concrete vibration efficiency. • High frequency hydraulic motor, for continuous operation. • High reliability under the heaviest conditions. Minimum maintenance. Hydraulic internal vibrator VH-15 Características técnicas Vibrator diameter: 150 mm Maximum frequency: 7800 vpm Centrifugal force: 2200 daN Working moment: 3,20 cm.kg Capacity: 50 m3 / h Maximum working pressure: 180 kg / cm2 Flow: 16 l / min Weight of vibrator: 36 kg A = 660 mm B = 1320 mm C= 70 mm D = 150 mm Description VH-15 hydraulic vibrators are basically used when vibrating the concrete in dams or big blocks in ports. The VH-15 vibrator head is specially treated to work with the most abrasive type of concrete. It is considered incorrodible and obtains an extraordinary durability. Besides this, the vibrator has been specially designed to keep on working even if the head was perforated. In case the head is finally worn out, the VH-15 vibrator offers the possibility of changing only the head and not the entire cylinder line. Its structure allows the head to be separated, with no need of disassembling the whole vibrator. The bearing, which supports a great part of the work, is specially chosen for a long durability even under the hardest conditions. Minimum spare parts are recommended for hypothetical repairs, as only 3 main pieces are liable to get damaged out of thirty that make up the vibrator. The task of repair can be easily achieved with the dismantling and re-assembly tools specially designed for this purpose and also with the quick-release couplings that vibrators are equipped with. Hydraulic internal vibrator VH-15 Minimum specifications that the machines must fulfil to install VH-15 Vibrators The installation of one VH-15 vibrators set in the chosen machine requires a specific study for each case, depending on the needs. The following comments refer to the vibrators installation in retroexcavators (1 & 3), where a variable flow pump is available. This pump simplifies the hydraulic circuit to be installed, as the same pump is capable of operating the vibrators as well, with no extra pump needed to be incorporated in the installation. For other machines such as bulldozers (2), it is necessary to incorporate an extra and independent circuit with its pump, tank, radiator... as these machines are generally equipped with rotary pumps. Thus, any machine on which a group of VH-15 vibrators are to be set up, must fulfil at least the following requirements: • Power 7.5 kW / vibrator • Hydraulic circuit flow: 16 l / min / vibrator • Pressure for Vibrator Circuit: 180 kg / cm2 • Cooling enough for: 3,5 kW / vibrator • Maximum pressure at discharge line: 3 bar • Variable flow pump. • Free distribution arm. Apart from the indicated power for the vibrators operation, the machine must offer the necessary power for moving the arm and the rocker. In case the pressure of the pump in this machine is higher a reducing valve will be installed. If the retroexcavator pump pressure is higher than the requested for the VH-15 vibrators right working, a reducing valve is installed, for the pressure not to exceed the 180 kg/cm2. The cooling is also an important point when choosing the right machine. Under the worst conditions, half of requested power for each vibrator is lost in the heat generation. It is also very interesting to have a machine equipped with a hydraulic hammer pre-installation. The cooling capacity is then generally increased by the machine manufacturers. Moreover, this element simplifies the installation. Hydraulic internal vibrator VH-15 VH-15 Internal Hydraulic Vibrator Installation. Groups are installed on a beam where 1, 2, 3, 4, 6 or 8 vibrators can be set, allowing at the same time an independent oscillatory movement for every single vibrator, which may spare an eventual breaking of the structure due to bumps or to unwanted drivings; protected with the double cushioning that exists between the vibrator and the machine. This system is provided with a double cardan and offers a harder resistance to bumps. The vibrators disposal will depend on the quantity as well as the work to be done. Optionally, there is the possibility of installing a turning system (registered), which enables a +/-90º turning of the whole set of vibrators, at a speed of half a turn in 2 seconds, offering complete manoeuvrability. Tunnels or remote places can be reached, reducing movements of the machine and improving considerably the efficiency of the vibrated concrete. The operator in the cab easily controls this turning. The distance between vibrators is determined depending on the reology of the concrete, just in the same way that the number of vibrators is adjusted to the production of concrete required. The standard version provides vibrators at a distance of 800 mm. between each other. Optionally, there is the possibility of fitting the machine with a system which allows regulating the distance between vibrators. A different version from the standard installation makes possible installing the vibrators in a bridge-crane or retro-machine, with rigid tube, for the vibrating of casts. Hydraulic internal vibrator VH-15 Hydraulic Circuit Description The hydraulic circuit design offers the possibility of adjusting the VH-15 vibrators frequency, through a flow regulator valve, compensated, that maintains a constant flow, independently from the pressure changes. The vibrator optimum working frequency is settled between 7500-7800 r.p.m. Oil is filtered in the pressure line, easily accessible and in a handy way for the microfilter change (10µm.). If the system is to be set on a shovel or bulldozers, the circuit can also be equipped with an extra pump and cooling-system. The whole system is perfectly furnished with flexible hose with a pressure margin, couplings with metalloplastic seal-rings and compact distributor block in treated aluminium. Hydraulic motor The hydraulic motor in the circuit, specially manufactured for this application, allows high speed and high pressure levels, fully appropriate for continuous works. Control instruments The whole hydraulic circuit is entirely checked through a control manometer in the cab, valves and pedals for control allowing a simple working for the whole system. Special devices URBAR can provide the system equipped with a special device for blocking which prevents the arm from accidentally dropping while in the paused position. On the other hand, it is also possible to provide separately a hydraulic device, very useful to make safely the necessary tests in a repair workshop. Hydraulic internal vibrator VH-15 VH-15 hydraulic vibrators installations. Machine Type HITACHI EX 50 UR PEL-JOB EB-506 O & K RH 2.8 C CASE 688-CKB Power Engine 25,7 kW (35 cv) at 2500 rpm 32,2 kW (44 cv) at 2500 rpm 40 kW (55 cv) at 2150 rpm 65 kW (88 cv) at 2000 rpm Hydraulic power - - 35 kW (48 cv) 55,6 kW (75 cv) Flow 60 l/min 75 l/min 2 x 71 l/min 210 + 44 l/min Working pressure 210 bar 250 bar 280 bar 350 bar Hydraulic tank capacity 86 l - - 115 l Circuit total capacity 120 l 106 l 150 l 184 l Number of vibrators 2 3 4 6 Complete installation weight 235 kg 320 kg 610 kg 770 kg The chosen machine characteristics have to be similar to the ones indicated in this list, for the VH-15 vibrators installation. The power left for the machines (arm and handle actionning), is as follows: • HITACHI EX 50 UR: 10,7 kW = 25,7 - 2x7,5 • PEL-JOB EB-506: 9,7 kW = 32,2 - 3x7,5 • O&K RH 2.8 C: 10 kW = 40,0 - 4x7,5 • CASE 688-CKB: 20 kW = 65,0 - 6x7,5 Vibrators installations in used machines Eventually, the VH-15 hydraulic vibrators installation can be undertaken on used machines. In this case, it is mandatory to achieve a serious revision in the machine for the pump, the hydraulic circuit, as well as the machine engine work in perfect conditions. Otherwise, the installation could not be done. Hydraulic internal vibrator VH-15 Exemples of applications 2 CASE POCLAIN 688 with 6 VH-15. O&K RH2.8 equipped with 4 VH-15. Poclain 75 with 6 vibrators. 6 VH-15 in retroexcavator GURIA 90S. Caterpillar 931 with 4 units. O&K RH2.8 equipped with 4 VH-15. Manufacturing Programme About URBAR Research on vibrators and its application on concrete and industry since the fifties Our Test Laboratory, VIRLAB, makes to be leaders in technology. Through our R+D department, we have reached a high quality level with resistant and reliable equipments. Our technical know-how guarantees the best design and the highest efficiency for every installation. Our specialists technical assistance assures the after sales service. Full scope in vibrating equipment. We work with vibration. We deal with vibration. Vibration is our job. • Electric internal vibrators. • Frequency converters. • Hydraulic internal vibrators installed in earth moving machines to vibrate big masses of concrete. • Electric external vibrators. • Air canons. • Vibrating applications, Engineering, everything in Vibration. • Vibration, Dynamic and Seismic Tests Laboratory. Calibration in acceleration and frequency fields. Offices in Barcelona, Bilbao, La Coruña, Madrid, Oviedo, Sevilla, Valencia and Zaragoza. Ctra. Villabona-Asteasu, km 3 Apartado 247 Tel. (+34) 943 691 500 Fax (+34) 943 692 667 E-20159 Asteasu www.urbar.com export@urbar.com VH-15 / 1 97.01