CN85202512U - Two-way stepless speed change device of pneumatic winch - Google Patents

Abstract

The utility model relates to the two-way stepless speed change device of a pneumatic winch, belonging to the field of the mining machinery. The device is composed of a valve sleeve and a valve core. The two-way stepless speed change device of a pneumatic winch can adjust the flow quantity and the flow speed of the compressed gas entering in the machine by controlling opening degrees of a plurality of air holes with different sizes which are arranged in the device and arrayed in definite order and in interval way. Meanwhile, the ingression air and the exhaust air in the machine can be partitioned. As a consequence, the device integrates the reversing function, the speed change function and the silencing function together. The pneumatic winch adopting the device design solves the technological problems that the former pneumatic winch has big noise and difficult two-way stepless speed change. The two-way stepless speed change can also be used on other pneumatic tools.

Description

Two-way stepless speed change device of pneumatic winch

The utility model device belongs to the mining machinery field.

Before the utility model device, be used for the commutation speed governing of piston type wind motor, generally form by change-over valve and two disengagement gears of flow regulating valve.And adopt the cylinder velocity ratio of one-way throttle valve control plunger formula wind motor more common.One-way throttle valve can only carry out folk prescription to throttling, regulates the speed of a direction.For example, in some gas circuit,, can use this valve in order to be advanced with fast return at a slow speed or to advance fast, return at a slow speed.If carry out the two-way infinite speed variation of piston type wind motor, then need to settle two one-way throttle valves, just can play the purpose of bidirectional speed governing.This commutation speed governing system, complicated operation is difficult to commutate at any time, speed governing.And this kind commutation speed governing system do not possess the function that reduces noise, thereby not too suits to use on air hoist.

The purpose of this utility model designs exactly and a kind ofly can reduce noise, and is simple in structure, easy operating, the two-way stepless speed-regulating device that uses on the suitable air hoist.

Fig. 1, be the spool front view of the two-way stepless speed-regulating device of air hoist.

Fig. 2, be B-B cutaway view among Fig. 1.

Fig. 3, be N-N cutaway view among Fig. 1.

Fig. 4, be spool expansion drawing among Fig. 1.Wherein 1,2 is two speed troughs, and 3,4 is two air discharge ducts, and 5 is inlet channel, and 6 is exhaust duct, and 7,8 are respectively the working edge of two speed troughs (1,2).

Fig. 5, be the valve pocket front view of the two-way stepless speed-regulating device of air hoist.

Fig. 6, be A direction view among Fig. 5.Wherein 9,10 is two keyways, and 11,12 are respectively the pore in the keyway (9 or 10).

Main points of the present utility model are to have designed a kind of Bidirectional stepless arrangements for speed regulation in the piston type wind motor of air hoist, and this device is made of valve pocket (Fig. 5) and spool (Fig. 1). Described valve pocket (Fig. 5) is in relative static conditions in machine, spool (Fig. 1) relatively valve pocket (Fig. 5) can be suitable, be rotated counterclockwise. The outer wall of said valve pocket (Fig. 5) has two keyways (9,10), is spaced in certain sequence vertically some pores that vary in size (11 or 12) in each keyway (9 or 10), and these two keyways (9,10) are connected with certain gas circuit in the machine separately. Two speed troughs (1 are arranged on the spool (Fig. 1), 2), they all are connected with air intake duct (5) on the spool (Fig. 1), two speed troughs (1,2) working edge (7,8) being the screw type edge, mainly is the control for upper keyway (9 or 10) inner air vent (the 11 or 12) opening degree of valve pocket (Fig. 5). Two air discharge ducts (3,4) are arranged on the spool (Fig. 1), and they all are connected with the upper exhaust duct (6) of spool (Fig. 1), are mainly used in connecting upper keyway (the 9 or 10) inner air vent (11 or 12) of valve pocket (Fig. 5), waste gas in the discharge machine. Control valve as air hoist--spool (Fig. 1) has a centre position of closing upper keyway (9, the 10) inner air vent (11,12) of valve pocket (Fig. 5) fully with respect to valve pocket (Fig. 5). At this moment, air hoist is in dead ship condition. When the spool that mediates (Fig. 1) is handled clockwise, when the screw type working edge (8) of the upper speed trough (2) of spool (Fig. 1) will be started working near the interior minimum pore of the upper keyway (10) of valve pocket (Fig. 5), the upper air discharge duct (3) of spool (Fig. 1) should be connected with upper keyway (9) inner air vent (11) of valve pocket (Fig. 5), is in open mode. Thereafter, the screw type working edge (8) of the upper speed trough (2) of spool (Fig. 1) is upper keyway (10) inner air vent (12) of breakdown valve pocket (Fig. 5) gradually, this moment, Compressed Gas is via speed trough (2), pass in the keyway (10) by the pore of breakdown (12), enter in the machine, enter machine interior flow, flow velocity thereby regulated Compressed Gas. The upper corresponding air discharge duct (3) of spool (Fig. 1) but is connected the waste gas in the discharge machine with another keyway (9) inner air vent (11). The upper speed trough (1) of spool (Fig. 1) and air discharge duct (4) at this moment are in the closed condition of inoperative. When the spool that mediates (Fig. 1) is handled counterclockwise, then valve pocket (Fig. 5) is gone up keyway (9, mutually conversion takes place in the position, inlet and outlet road that 10) inner air vent led to, when the screw type working edge (7) of upper another speed trough (1) of spool (Fig. 1) will be started working near the interior minimum pore of upper another keyway (9) of valve pocket (Fig. 5), the upper air discharge duct (4) of spool (Fig. 1) should be connected with upper keyway (10) inner air vent (12) of valve pocket (Fig. 5). Afterwards, by the screw type working edge (7) of the upper speed trough (1) of spool (Fig. 1) upper keyway (9) inner air vent (11) of breakdown valve pocket (Fig. 5) gradually, regulate Compressed Gas and enter machine interior flow, flow velocity, connect keyway (10) inner air vent (12), waste gas in the eliminating machine by the upper air discharge duct (4) of spool (Fig. 1). The upper speed trough (2) of spool (Fig. 1) and air discharge duct (3) at this moment are in the closed condition of inoperative.

The two-way stepless speed-regulating device of this air hoist, its spool (Fig. 1) is gone up the areal extent of speed trough (1 or 2) can go up the interior whole pores (11 or 12) of keyway (9 or 10) by breakdown valve pocket (Fig. 5), and spool (Fig. 1) is gone up the areal extent of corresponding air discharge duct (4 or 3) can connect the interior whole pores (12 or 11) of keyway (10 or 9) completely.

The utility model compared with prior art has its unique advantage.At present from domestic and international prior art, the also inaccessible level that can be applicable to the two-way infinite speed variation of air hoist.The utility model collects commutation, speed governing, silencing function in a device, and it is simple in structure, and operation is convenient, operates by a handlebar in the little scope of amplitude, promptly can carry out the two-way infinite speed variation of air hoist at any time.The general difficulty of the flow regulating valve of prior art possesses silencing function.The utility model device is cut apart pressure gas in the machine of entering and the waste gas in the discharge machine by the interval pore, has played the effect that reduces noise.The inventor has manufactured experimently a JFH0.3/15 type air hoist with this two-way stepless speed-regulating device, and noise is not more than 85 decibels after tested.

The utility model device is not only applicable to air hoist, but also to can be used for wind be on other air driven tools of power.

Claims (4)

1, a kind of two-way stepless speed-regulating device that is used for air hoist inner carrier formula wind motor that constitutes by valve pocket (Fig. 5) and spool (Fig. 1), it is characterized in that described valve pocket (Fig. 5) outer wall has two keyways (9,10), be spaced some pores that vary in size (11 or 12) in each keyway (9 or 10) vertically in certain sequence, two keyways (9,10) communicate with certain gas circuit in the machine separately.Two speed troughs (1,2) and two air discharge ducts (3,4) are arranged on the described spool (Fig. 1), and they go up inlet channel (5) with spool (Fig. 1) respectively and exhaust duct (6) is connected.The relative valve pocket (Fig. 5) of described spool (Fig. 1) has one makes last two keyways of valve pocket (Fig. 5) (9,10) inner air vents (11,12) be in the midway location of closing fully.When described spool (Fig. 1) relatively valve pocket (Fig. 5) suitable, rotate counterclockwise, then last two speed troughs of spool (Fig. 1) (2,1) have a position that a keyway corresponding with it (10 or 9) inner air vent (12 or 11) is connected gradually in different time separately.Last two air discharge ducts of spool (Fig. 1) (3 or 4) also have a position that a keyway corresponding with it (9 or 10) inner air vent (11 or 12) is connected gradually in different time separately.

2, the two-way stepless speed-regulating device of air hoist as claimed in claim 1, the working edge (7 or 8) that it is characterized in that the last speed trough of described spool (Fig. 1) (1 or 2) near and when minimum pore will be started working in the keyway (9 or 10) on the breakdown valve pocket (Fig. 5) gradually, spool (Fig. 1) is gone up a corresponding air discharge duct (4 or 3) and should be gone up another keyway (10 or 9) inner air vent (12 or 11) with described valve pocket (Fig. 5) and connect.And last another speed trough (2 or 1) of spool (Fig. 1) and another air discharge duct (3 or 4) at this moment are in the closed condition of inoperative.

3, the two-way stepless speed-regulating device of air hoist as claimed in claim 2, the working edge (7,8) that it is characterized in that last two speed troughs of described spool (Fig. 1) (1,2) all is screw type edges.

4, as claim 1, the two-way stepless speed-regulating device of 2 or 3 described air hoists, it is characterized in that on the described spool (Fig. 1) a speed trough (1 or 2) but the last keyway of areal extent breakdown valve pocket (Fig. 5) (9 or 10) in whole pores (11 or 12), the areal extent that described spool (Fig. 1) is gone up a corresponding air discharge duct (4 or 3) can be connected the whole pores (12 or 11) in another keyway (10 or 9) completely.