SU891227A1

SU891227A1 - Power table

Info

Publication number: SU891227A1
Application number: SU762431073A
Authority: SU
Inventors: Владимир Михайлович Пестунов; Владимир Андреевич Крыжановский
Original assignee: за вители
Priority date: 1976-12-20
Filing date: 1976-12-20
Publication date: 1981-12-23

Description

1one

Изобретение относитс к станкостроению и может быть использовано в специальных агрегатных станках и автоматических лини х.The invention relates to a machine tool industry and can be used in special aggregate machines and automatic lines.

Известна конструкци силового стола, содержаща рабочую платформу, св занную с гидравлическим приводом поступательного движени , и систему управлени циклом (1).The known design of the power table, containing a working platform associated with the hydraulic drive of the translational motion, and the cycle control system (1).

Однако известный силовой стол имеет сложную конструкцию, а использование отдельной гидростанции увеличивает габариты , вес и усложн ет эксплуатацию станков. Точность системы управлени не высока, что ведет к снижению производительности.However, the well-known power table has a complex structure, and the use of a separate hydraulic station increases the size, weight and complicates the operation of the machines. The accuracy of the control system is not high, which leads to a decrease in performance.

Цель изобретени - повышение точности воспроизведени заданной программы поступательных движений платформы стола, а также обеспечивание защиты механизма стола от поломок.The purpose of the invention is to improve the accuracy of reproducing a given program of translational movements of the table platform, as well as to ensure the protection of the table mechanism from damage.

Поставленна цель достигаетс тем, что силовой стол снабжен зубчато-реечной передачей , рейка которой жестко закреплена на платформе, а шестерн - на валу, установленном с возможностью вращени в подшипниках основани , а система управлени включает датчик обратной св зи по скорости перемещени платформы и тормозное устройство, установленные по обоим концам упом нутого вала с шестерней:The goal is achieved by the fact that the power table is equipped with a rack and pinion gear, the rail of which is rigidly fixed on the platform, and the gear wheel on the shaft mounted for rotation in the base bearings, and the control system includes a feedback sensor for the speed of movement of the platform and the braking device mounted at both ends of said shaft with gear:

На фиг. 1 показан силовой стол, вид сверху; на фиг. 2 - разрез А-А на фиг. 1.FIG. 1 shows a power table, top view; in fig. 2 shows section A-A in FIG. one.

Силовой стол содержит основание 1 с направл ющими 2, по которым перемешаетс платформа 3, на ней закреплена рейка 4, вход ша в зацепление с шестерней 5, вал 6 шестерни 5 находитс в опорах и с одной стороны св зан с электрическим тормозным The power table contains a base 1 with guides 2 along which platform 3 is mixed, rail 4 attached to it, shaft in engagement with gear 5, shaft 6 of gear 5 is in supports and on one side connected with electric brake

10 устройством 7, а с другой стороны соединен с датчиком 8.10 by the device 7, and on the other hand is connected to the sensor 8.

Claims

The platform 3 has a cylindrical bore 9 which plays the role of a pneumatic cylinder in which the piston 10 is placed. The piston rod 15 is fixedly mounted on the base -. SRI 1. The system for controlling the work cycle and adjusting the rate of translational movements of the working platform of the table contains software device II associated with the comparing device L 2, the second 20 input of which is connected to the sensor 8. Output. comparison device 12 Conjugate to the brake control unit -13 7.. (, and; and) directly works with a rescued underpressure and G), part 1 of the cylinder cavity of the platform 3. Technological load is absent and the table begins to accelerate in the direction towards the workpiece (the assembly of the aggregate machine is considered when forces are in progress. The second table bears the tool head and the part is fixed on the pivoting rotary table), (the fast feed speed is set by the software device 11, the signal of which is compared with the signal of the sensor 8 in the comparison device 12. In case The error signals e software device I 1 I 8 sensor control unit 13 includes or g yklyuchaet braking device 7 and thereby reduces or increases the speed of movement of the platform 3 so on) azom software device 11 supports the progressive movement speed at a predetermined level. This minimizes idle time and improves productivity. When changing the output signal of the software device 11, giving the command to transition from the accelerated approach to the working feed, the control unit 13 increases the amplitude or frequency of the control cifi4ia; ia braking device 7. Since the magnitude of the driving force is determined by the pressure in the pneumatic circuit and structural parameters of the gy.ocylinder and remains constant regardless of the elements of the motion cycle of the platform, the braking device is applied to the platform by a resistance force of such magnitude to reduce the speed of the fast approach to The causes of the working feed, which is determined by the sensor 8, which is the feedback in the speed control system. When loading the plate 4 by the feed force, i.e., the technological load, the load on the braking element 7 decreases. In the case of decreasing the value of the process load, the feed rate begins to increase, which leads to an increase in the output signal of the sensor 8 and the comparison device 12 sends a command through the control unit 13 to turn on the braking device 7, which leads to an increase in resistance forces and the feed rate decreases to the level specified by the software device . The process of switching on and off of the braking device is determined by the constant value of the technological load, and the maintenance of a constant feed rate is carried out by feedback on the speed limit covering the control system. moreover, the magnitude of the driving force prechyschit resistance forces. This allows; Apply the tool and mechanism from the ice cups, as in the case of an increase in the resistance forces and an excess of the driving force, the flow is degraded, i.e., the working body of the table stops, until the condition arises that the driving force does not exceed the resistance force. To effect an accelerated removal, pressure is supplied to the rod cavity of the hydraulic cylinder platform 3, and the 6ecujTOKOBaH cavity is connected to the drain line or atmosphere. Maintaining the required speed is carried out by an identically accelerated approach. The proposed design of the power table allows to significantly simplify its design and operation. Since in the cycle control there is a relationship between the driving force and the resistance force, it is possible to control the cycle by force, which allows improving the accuracy of the cycle and performance, as well as protecting the tool and the table mechanism from overloads without additional devices. The proposed design can be widely used in the making of special and fast-repositioned specialized aggregate machines and automatic lines. The simplicity of the mechanical part of the table and the cycle control system of the work cycle makes it possible to create simple, cheap and reliable machines for mass, mass production and mass production of general and specialized engineering. The invention includes a power table, a base, a working platform connected with a hydraulic drive of its translational movement, and a platform motion cycle control system, characterized in that, in order to improve the reproduction accuracy of a given control cycle and ensure protection of the table mechanism from breakages, the table is equipped a rack and pinion gear, the rack of which is rigidly fixed on the platform, and the gear is mounted on a shaft mounted rotatably in the base bearings, and the control system includes A feedback loader on the speed of movement of the platform and a braking device mounted at both ends of the said shaft with gear. Sources of information taken into account in the examination I. Melamed GI, et al. Aggregate machines. M., “Mechanical Engineering :, 1964, p. 6I-62, FIG. 48.