SU933445A2

SU933445A2 - Vibration insulated pneumatic tool handle

Info

Publication number: SU933445A2
Application number: SU802884997A
Authority: SU
Inventors: Виктор Яковлевич Онищенко
Original assignee: Краснодарский политехнический институт
Priority date: 1980-02-20
Filing date: 1980-02-20
Publication date: 1982-06-07

Description

Изобретение относится к средствам Ъиброзащиты человека-оператора и может быть использовано в ручных пневмоударных машинах.The invention relates to means of protection of the human operator and can be used in manual pneumatic impact machines.

По основному авт. св. Ν’ 768629 ₅ известна виброзащитная рукоятка пневмоинструмента, содержащая С-образный корпус с перекладиной, установленную на нем с возможностью осевого перемещения полую собственно рукоятку (обой-,₀му), в которой по обе стороны перекладины размещены герметичные эластичные камеры. Эти камеры связаны с пневмосистемой и сообщены между собой дросселями, а их объемы выбраны ₎₅так, что произведение разности внутренних поверхностей эластичных камер, расположенных соответственно над и под перекладиной, на давление в пневмомагистрали равно допустимому усилию _мнажатия на рукоятку [lj.According to the main author. St. Ν '768629 _{5 the} vibration-proof handle of a pneumatic tool is known, containing a C-shaped body with a crossbar mounted on it with the possibility of axial movement of the hollow handle itself (wallpaper, ₀ mu), in which tight elastic chambers are placed on both sides of the crossbar. These chambers are connected to the pneumatic system and interconnected by throttles, and their volumes are selected _{) 5} so that the product of the difference between the inner surfaces of the elastic chambers located respectively above and below the crossbar and the pressure in the pneumatic line is equal to the allowable effort _m pressing the handle [lj.

Однако эффективность виброзащиты этого устройства снижается, во-первых, потому, что масса полой обоймы невелика (из теории колебаний известно, что увеличение подпружиненной массы снижает ее вибрацию), вовторых - потому, что воздух в пневмокамеры поступает от молотка, т.е. после прохождения через пусковой клапан. Следовательно, камеры будут заполняться сжатым воздухом только при открытом клапане. В положении Стоп воздух будет уходить из камер, а в начале каждого пуска требуется время на наполнения камер воздухом. Поскольку при эксплуатации пневмомолотка Пуск и Степ чередуются довольно часто, то рукоятка будет постоянно пребывать в состоянии упругой деформации (перемещения).However, the vibration protection efficiency of this device is reduced, firstly, because the mass of the hollow cage is small (from the theory of oscillations it is known that an increase in the spring-loaded mass reduces its vibration), and secondly, because the air enters the pneumatic chambers from the hammer, i.e. after passing through the start valve. Therefore, the chambers will be filled with compressed air only with the valve open. In the Stop position, air will leave the chambers, and at the beginning of each start-up, time is required to fill the chambers with air. Since during operation the pneumatic hammer Start and Step alternate quite often, the handle will constantly remain in a state of elastic deformation (movement).

Цель изобретения - повышение эффективности ви броз ащи ты.The purpose of the invention is to increase the efficiency of virosis.

Для этого в корпусе предлагаемой рукоятки выполнен канал, соединяющий эластичные камеры с пневмосистемой, имеющей ниппель, расположенный перед пусковым клапаном, а рукоятка снабже3 на гибким шлангом, соединяющим выходной канал пневмосистемы с корпусом пневмоинструмента.For this, a channel is made in the housing of the proposed handle connecting the elastic chambers with a pneumatic system having a nipple located in front of the start valve, and the handle is provided with 3 a flexible hose connecting the pneumatic system output channel to the pneumatic tool body.

На фиг. 1 изображена предлагаемая рукоятка со встроенным виброизолятором, продольный разрез; на фиг. 2 разрез А-А на фиг. 1.In FIG. 1 shows the proposed handle with a built-in vibration isolator, a longitudinal section; in FIG. 2, section AA in FIG. 1.

Виброзащитная рукоятка пневмоинструмента содержит С-образный корпус 1 с перекладиной 2, установленную на нём обойму 3 с корпусом пускового механизма 4 и герметичные эластичные камеры 5 и 6, размещенные по обе стороны перекладины 2 в обойме 3, которая служит собственно рукояткой и вместе с закрывающей ее снизу планкой. 7 имеет форму, удобную для охвата рукой. Обойма.3 вместе с корпусом пускового механизма 4 взаимодействует с перекладиной 2 и корпусом 1 посредством тел качения 8. Между собой камеры 5 6 соединены дроссельными отверстиями 9, а с полостью пневмосистемы (не показана), примыкающей к пусковому клапану 10 (перед клапаном) - каналом 11, закрытым ниппелем 12. Пусковой шариковый клапан 10 с одной стороны прижат к гнезду пружиной 13 и присоедонительным штуцером 14, ас другой стороны взаимодействует с толкателем 15 и пусковым рычажком 16, установленным в двойной стенке обоймы 3 на оси 17· Выходной канал пневмосистемы (за клапаном) соединен с корпусом ручной машины гиб 35 ким шлангом 18.The vibration-proof handle of the pneumatic tool contains a C-shaped housing 1 with a crossbeam 2, a clip 3 mounted on it with a trigger housing 4, and hermetic elastic chambers 5 and 6 located on both sides of the crossbar 2 in the clip 3, which serves as the handle itself and together with the cover bottom bar. 7 has a shape suitable for hand grip. The holder. 3 together with the trigger mechanism housing 4 interacts with the crossbar 2 and the housing 1 by means of rolling bodies 8. The chambers 5 6 are connected to each other by throttle holes 9, and to the pneumatic system cavity (not shown) adjacent to the trigger valve 10 (in front of the valve) - channel 11, closed by a nipple 12. The start ball valve 10 is pressed against the socket by a spring 13 and a connecting fitting 14, while on the other hand it interacts with the pusher 15 and the trigger 16 installed in the double wall of the cage 3 on the axis 17. The output channel of the system (behind the valve) is connected to the body of the manual machine by a flexible 35 hose 18.

933445 4 мещает толкатель 15 вдоль оси и поднимает пусковой клапан 10. Сжатый воздух через гибкий шланг 18 поступает в рабочие полости пневмомолотка (ра5 бочий цикл).933445 4 places the pusher 15 along the axis and raises the starting valve 10. Compressed air through the flexible hose 18 enters the working cavity of the pneumatic hammer (work cycle).

Под воздействием нажимного усилия, создаваемого рукой рабочего воздух перетекает черз дроссельные отверстия 9 из одной камеры в другую ю в зависимости от величины усилия нажатия и вне зависимости от положения пускового клапана Пуск или Стоп. Стабильность избыточного давления в камерах 5 и 6 обеспечивает выравнива15 ние эффективности виброзащиты как вначале, так и в процессе рабочего режима пневмоинструмента. Постоянное же сообщение камер с пневмомагистралью позволяет автоматически подпитывать го их сжатым воздухом. Дросселирование воздуха в закрытых эластичных камерах, исключающее утечку воздуха, повышает упругодемпфирующие качества рукоятки.Under the influence of the pressure exerted by the hand of the worker, air flows through the throttle openings 9 from one chamber to another depending on the magnitude of the pressure exerted and regardless of the position of the Start or Stop valve. The stability of the overpressure in chambers 5 and 6 ensures equalization of the vibration protection efficiency both at the beginning and during the operation of the pneumatic tool. The constant communication of the chambers with the pneumatic line allows them to be automatically fed with compressed air. Throttling of air in closed elastic chambers, eliminating air leakage, increases the elastic-damping quality of the handle.

Повышение эффективности виброзащиты достигается также и увеличением подпружиненной массы рукоятки, так как корпус, пускового механизма 4, собственно пусковой механизм (дета зо ли 10, 13, 15, 16, 17) и присоединительный штуцер 14 выполнены заодно с обоймой 3, удерживаемой рукой рабочего.An increase in the efficiency of vibration protection is also achieved by increasing the spring weight of the handle, since the housing, the trigger 4, the trigger itself (parts 10, 13, 15, 16, 17) and the connecting fitting 14 are made integral with the clip 3 held by the worker’s hand.

Claims

This invention relates to the protection of a human operator and can be used in manual air-impact machines. According to the main author. St. W 768629 a pneumatic tool's vibroprotecting handle is known, comprising a C-shaped body with a crossbar mounted on it with the possibility of axial movement of a hollow handle (on both sides), in which hermetic elastic chambers are located on both sides of the crossbar. These chambers are connected to the pneumatic system and are interconnected by the throttles, and their volumes are chosen so that the product of the difference between the internal surfaces of the elastic chambers located respectively above and below the crossbar and the pressure in the main line is equal to the allowable pressing force on the handle lj. However, the effectiveness of the vibration protection of this device decreases, firstly, because the mass of the hollow cage is small (it is known from oscillation theory that increasing the spring-loaded mass reduces its vibration), and secondly, because the air enters the pneumatic chamber from a hammer, i.e. after passing through the starting valve. Consequently, the chambers will be filled with compressed air only with the valve open. In the Stop position, the air will leave the chambers, and at the beginning of each start, time is required to fill the chambers with air. Since during operation of the pneumatic hammer, the Start and Step alternate quite often, the handle will be constantly in the state of elastic deformation (displacement). The purpose of the invention is to increase 3 | effect in the bridge of the species. For this purpose, in the case of the proposed handle, a channel is made connecting elastic chambers with a pneumatic system having a nipple located in front of the starting valve, and the handle is equipped with a flexible hose connecting the output channel of the pneumatic system with the pneumatic pressure gauge body. FIG. 1 shows the proposed handle with integrated vibration isolator, a longitudinal section; in fig. 2, section A-A in FIG. 1. Vibration protection handle of the pneumatic instrument contains a C-shaped case 1 with a crossbar 2, a holder 3 mounted on it with a case of the trigger mechanism k and hermetic elastic chambers 5 and 6 located on both sides of the crossbar 2 and the holder 3 which is actually a handle and together with its closure from below the bar. 7 has a shape suitable for reaching by hand. The yoke 3, together with the trigger case k, interacts with the crossbar 2 and the housing 1 by means of a body 8. Between the chambers 5 4 6 are connected by throttle holes 9, and with the pneumatic system cavity (not shown) adjacent to the trigger valve 10 (in front of the valve ) - channel 11, closed nip Pel 12. Starting ball valve 10 on the one hand pressed to the socket by a spring 13 and connecting fitting 14, and on the other hand interacts with the pusher 15 and the starting lever 16, installed in the double wall of the yoke 3 on the axis 17 of the output kana pneumatic system (for valve) is connected to the power tool housing thrust KIM hose 18. Powered vibrozashchitnyh handle pneumatic follows. When the compressed air line (not shown) is turned on, the sealed chambers S and 6 are filled through channel 11 and nipple 12. At the same time, the value of the initial overpressure in the chambers can be either equal to the air pressure in the line or less. The reduction of the overpressure in the chambers is achieved by selecting the nipple 12 of appropriate rigidity and changing the cross section of the channel 11. Next, the pneumatic tool is put into operation by pressing the thumb on the starting lever 16. It pivots on the axis 17, pushes the pusher 15 along the axis and raises the starting valve 10. Compressed air through a flexible hose 18 enters the working cavity of the pneumatic hammer (working cycle). Under the influence of the pressure exerted by the hand, the working air flows through the throttle openings 9 from one chamber to another, depending on the magnitude of the pressing force and regardless of the position of the Start or Stop valve. The stability of the overpressure in chambers 5 and 6 ensures equalization of the effectiveness of vibration protection both at the beginning and during the operating mode of the pneumotool. The constant communication of the chambers with the pneumatic pipeline allows automatic feeding with compressed air. The throttling of air in closed elastic chambers, which prevents air leakage, increases the elastic-damping qualities of the handle. The increase in the effectiveness of vibration protection is also achieved by an increase in the spring-loaded mass of the handle, since the housing, the trigger 4, the trigger itself (details 10, 13, 15, 16, 17) and the connecting fitting k are made integral with the clip 3 held by the working hand. Claims of the Pneumatic Tool Vibroprotecting Handle EV, NT 768629, about tl and h and y and a. In order to increase the effectiveness of vibration protection, a channel is made in the handle body that connects elastic chambers with a pneumatic system having a nipple in front of the starting valve, and the handle is equipped with a flexible hose connecting the pneumatic system output channel to the pneumatic tool body. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 768629, cl. B 25 D 17/2, 1978 (prototype).