CN103234060B - Radial-force-balancemanual manual control air valve - Google Patents

Abstract

The present invention is a kind of Radial-force-balancemanual manual control air valve, reliable performance, long service life.It comprises valve body, rotational valve core, handle, retaining spring, sealing gasket, gas port joint, valve body, handle connection of rotating spool is placed in valve body inner bore, handle rotates, rotational valve core is rotated in valve body inner bore, during rotation, steel ball is being built under the retaining spring effect on rotational valve core, falls into each locating slot C of valve body respectively; Two sealing gasket symmetries are placed in rotational valve core cylindrical seal groove, sealing gasket and valve body inner bore wall form two air chamber A, 2 air chambers is also connected by air flue, valve body offers four air flues respectively by gas port joint and from outside connection, according to positioning hole determination commutation position, realize disconnection or the connection of air chamber and each gas port air flue respectively.The present invention does not have axial force and not by the impact of radial force, operates light and flexible, reliable performance, long service life.

Description

Radial force balanced manual control air valve

technical field

The invention belongs to the technical field of pneumatic reversing valves, in particular to a radial force balance manual control air valve in a dump truck pneumatic control system.

Background technique

At present, the rotary shaft type manual control air valve structure of dump trucks (as shown in Figures 1, 2, 3, and 4), the rotating valve cover 21 is constrained on the cantilever shaft of the valve body 25 by the baffle plate 22, and the gas passes through the air inlet joint Ⅻ and the gas valve. Road b enters the air chamber a formed by the sealing gasket 27 on the sealing groove of the rotating valve cover and the end face of the valve body 25, and the rotating valve cover 21 is rotated around the end shaft of the valve body 25 by moving the handle 26, and the two limit pins 28, 29 determines the stroke range, and the positioning spring 23 supports the steel ball 24 to determine the reversing position. When the air chamber a in the middle position of the handle 26 is disconnected from the air passages of the other 3 air ports; The airway c is connected; when the handle 26 is turned right, the air chamber a is connected with the descending air port joint XIV airway d; when the handle 26 is turned right again, the air chamber a is connected with the descending air port joint XIV and the slow descending air port joint XIII airway Through, the above-mentioned due to the change of the rotating position of the rotating valve cover 21, the air chamber a is disconnected or connected to a certain air channel respectively to control the hydraulic reversing valve to realize the functions of stopping, lifting, lowering or slow lowering of the dump truck. During operation, the gas pressure in the air chamber a, the compression and rebound force of the sealing gasket 27 and the compression elastic force of the positioning spring 23 all act on the rotating valve cover 21, and the rotating valve cover 21 transmits the resultant force in the axial direction to the fixedly connected valve. On the baffle plate 22 of the body 25, the end surface of the rotating valve cover 21 and the baffle plate 22 are under the action of this axial force for a long time and rotate and rub against each other, resulting in wear of the contact surface, which increases the friction between the valve body 25 and the rotating valve cover 21. The fit gap between the two end faces reduces the compression of the sealing gasket 27, which easily causes air leakage in the air chamber, resulting in functional damage and potential safety hazards. Due to the presence of axial force, the frictional resistance to the rotation of the handle 27 is increased to make the operation inflexible.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and to provide a radial force balanced manual valve that ensures that no axial force is generated when the manual control valve rotates the valve core under any circumstances, and the radial force is always symmetrically offset and balanced. Control air valve.

The technical solution adopted by the present invention to solve the technical problem is: a manual control air valve with no axial force and symmetrically offset and balanced radial force, which includes a valve body, a rotating valve core, a handle, a positioning spring, a steel ball, and a sealing gasket , the first air port joint, the second air port joint, the third air port joint, and the fourth air port joint are installed on the valve body, which is characterized in that: the handle is connected to the rotating valve core and placed in the inner hole of the valve body, and a handle rotation stroke is set on the valve body The range groove, the handle and the inner hole of the valve make the rotating spool axially and radially constrained, the handle rotates the spool within the stroke range and rotates in the inner hole of the valve body, and the steel ball acts on the positioning spring built in the rotating spool when turning. and fall into each positioning groove C of the valve body respectively; two gaskets are symmetrically placed in the sealing groove of the outer circle of the rotating valve core, and the gasket and the hole wall in the valve body form two air chambers A, and the two air chambers A pass through the air The air passages are connected, and the valve body has four air passages connected to the external passage through the air port joints, and the reversing position is determined according to the positioning groove C, so as to realize the disconnection or connection of the air chamber and the air passages of each air port respectively. The sealing pads placed in the symmetrical sealing grooves at both ends of the rotating valve core and the hole wall in the valve body form two air chambers with the same area and symmetrical positions. The two air chambers are connected with the air passage. When the handle is in the middle position, the air chamber A is disconnected from all air ports; when the handle is turned right, the air chamber A is only connected to the air channel of the third air port joint of the lift port; when the handle is turned left Chamber A is connected to the air passage of the first air port connector of the descending air port; when the handle is turned to the left, the air chamber A is connected to the air passage of the descending air port and the first and fourth air port joints of the slow descending air port at the same time. Change, the air chamber A is disconnected or connected to a certain air port respectively to control the hydraulic reversing valve to realize the functions of stopping, lifting, lowering and slow lowering of the dump truck.

The beneficial effects of the present invention are: the air chamber is arranged on both sides of the outer circle of the rotating valve core, and the rotating valve core has no axial force, only radial force, but the position of the air chamber is symmetrical, and the force-bearing areas of the air chamber are equal in size, so the radial force Equal in size and opposite in direction so that the radial force balance is offset. The technical scheme has advanced structure, no axial force and no influence of radial force, light and flexible operation, reliable performance and long service life.

Description of drawings

Figure 1 is the front view of the manual control air valve structure in the hydraulic system of the dump truck at present.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a sectional view of Fig. 1A-A.

FIG. 4 is a partial enlarged view of B in FIG. 1 .

Fig. 5 is a front view of the radial force balanced manual control air valve structure of the present invention.

FIG. 6 is a left side view of FIG. 5 .

Fig. 7 is a B-B sectional view of Fig. 5 .

FIG. 8 is a partially enlarged schematic diagram of FIG. 5C .

specific implementation plan

Referring to accompanying drawings 5, 6, 7, 8, the radial force balance manual control air valve includes a valve body 1, a rotating valve core 2, a handle 6, a gasket 5, a positioning spring 4, a steel ball 3 and a The Ⅰ, Ⅱ, Ⅲ, Ⅳ gas port joints on 1 are characterized in that the rotating valve core 2 is placed in the inner hole of the valve body 1 and connected with the handle 6, and the valve body 1 is provided with a groove for the rotation range of the handle 6, and the handle 6 is connected with the handle 6. The inner hole of the valve body 1 constrains the rotating spool 2 axially and radially, and the rotating handle 6 can make the rotating spool 2 rotate in the inner hole of the valve body 1 according to the stroke range, and the positioning built in the rotating spool 2 when rotating Under the action of the spring 4, the steel balls 3 can be dropped into the positioning grooves C of the valve body 1 respectively. Two sealing pads 5 are symmetrically placed in the outer circular sealing groove of the rotating valve core 2, and the sealing pads 5 and the inner hole wall of the valve body 1 form two air chambers A with the same area and size, and the two air chambers are connected through the air passage. The valve body 1 is provided with four air passages connected to the external passage through the I, II, III, and IV air port joints respectively. The control gas enters the two air chambers A through the joint of the second air port and the air passage. The handle 6 is rotated left and right, and the reversing position is determined by the four positioning grooves C of the valve body 1, so that the air chamber and the air passages of the joints of the first, third and fourth air ports are respectively connected. Disconnect or the air chambers are respectively connected to one of the air port joints in sequence through the air passages, and the other air passages are disconnected to control the hydraulic reversing valve to realize the functions of stopping, lifting, lowering and slow lowering of the dump truck. Rotate the outer circle of the valve core 2 to set the air chamber A, and the rotating valve core has no axial force, but is only affected by the radial force of the air pressure in the air chamber A. Since the two air chambers A have the same force area and symmetrical positions, the radial force The radial force balances when equal directions act oppositely on a straight line. If the radial force produced by the compression of the positioning spring 4 is considered, the positions of the two air chambers can be determined according to the size of the radial force to realize the balance of the radial force on the entire circumference of the rotating valve core 2 .

Claims (1)

1. Radial-force-balancemanual manual control air valve, it comprises valve body (1), rotational valve core (2), handle (6), retaining spring (4), steel ball (3), sealing gasket (5), Ith gas port joint, IIth gas port joint, IIIth gas port joint, IVth gas port jiont treatment is on valve body (1), handle (6) connection of rotating spool (2) is placed in valve body (1) endoporus, valve body (1) is offered handle (6) rotational travel scope groove, handle (6) and valve body (1) endoporus make rotational valve core (2) axis and radial direction be retrained, handle (6) rotates in stroke range, rotational valve core (2) is rotated in valve body (1) endoporus, it is characterized in that: when rotational valve core (2) rotates, steel ball (3) is being built under the effect of the retaining spring (4) on rotational valve core (2), fall into each locating slot C of valve body (1) respectively, two sealing gasket (5) symmetries are placed in rotational valve core (2) cylindrical seal groove, sealing gasket (5) and valve body (1) inner hole wall form two air chamber A, 2 air chambers is also connected by air flue, valve body (1) offers four air flues respectively by the Ith, II, III, IV gas port joint and from outside connection, according to positioning hole determination commutation position, realize disconnection or the connection of air chamber and each gas port air flue respectively, sealing gasket (5) is communicated with two air chambers that valve body (1) inner hole wall is formed, air chamber lifting surface area size is identical, positional symmetry.