CN214465217U

CN214465217U - Floating valve structure

Info

Publication number: CN214465217U
Application number: CN202120455522.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Xuzhou Weishize Electromechanical Equipment Co ltd
Current assignee: Xuzhou Weishize Electromechanical Equipment Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-10-22
Anticipated expiration: 2031-03-03

Abstract

The utility model discloses a floating valve structure belongs to the hydrovalve field. The reversing valve core and the floating valve core form an integrated main valve core, and the main valve core is arranged in a valve core hole of the valve body; when the main valve core is in the first direction changing position and the third direction changing position, the first floating cavity is not communicated with the second floating cavity; when the main spool is in the second shift position, the first and second floating chambers are in communication. When the main valve core is in the first direction changing position and the second direction changing position, the third input port is not communicated with the third output port; when the main valve core is in a third reversal position, the first input port is closed, and the third input port is communicated with the third output port. The utility model realizes the floating function of the feed oil cylinder associated with the reverse rotation of the hydraulic motor on the basis of not additionally increasing hydraulic elements; the multi-way valve runner is simpler and more convenient, the whole multi-way valve runner is more flat and smaller, the weight is light, the height of the multi-way valve can be effectively reduced, the use is easy, and the arrangement and the use in the whole machine are convenient.

Description

Floating valve structure

Technical Field

The utility model relates to a hydrovalve field especially relates to a floating valve structure.

Background

The underground drilling machine for the mine is main equipment for preventing and controlling gas and water damage in the coal mining process, and plays an important role in the aspect of guaranteeing the safe production of a coal mine. In the drilling process, a drill rod dismounting procedure is necessary. When the drill rod is dismantled, the clamp holder and the chuck respectively clamp two adjacent sections of drill rods, the chuck is driven to rotate reversely through the hydraulic motor, the two adjacent sections of drill rods are gradually separated from the connecting thread, and meanwhile, the latter section of drill rod is required to automatically and slowly move backwards along with the separated thread in order to avoid damage to the connecting thread of the drill rod. A common and very effective method is to float the feed cylinder that moves the hydraulic motor and chuck back and forth while the hydraulic pressure is being developed.

In order to ensure that the feeding oil cylinder can be started and stopped stably without sliding down under various drilling angles of the drilling machine, a hydraulic lock or a balance valve is usually added on an oil path of the feeding oil cylinder. If the feed oil cylinder is floated when the hydraulic motor rotates reversely, the hydraulic lock or the balance valve can be opened only by using a motor reverse oil circuit signal, so that the oil circuits of the large cavity and the small cavity of the feed oil cylinder are communicated on a middle position channel of the reversing valve; or an additional floating valve is arranged to enable the oil passages of the large cavity and the small cavity of the feed oil cylinder to be communicated. In any scheme, as long as additional hydraulic elements (such as a shuttle valve, a hydraulic control reversing valve and the like) are added to realize the floating function, the number of parts of the valve body is increased, the flow channel is complicated, the volume and the weight of the valve body are increased, and the arrangement and the use of the valve body in the whole machine are not facilitated.

Disclosure of Invention

An object of the utility model is to provide a floating valve structure for on the basis that does not increase extra hydraulic component, realize feed cylinder's unsteady function, and reduce the volume and the weight of multiple unit valve.

In order to realize the purpose, the utility model discloses the technical scheme who takes is:

a float valve structure characterized by: the reversing valve core and the floating valve core form an integrated main valve core, and the main valve core is arranged in a valve core hole of the valve body; the valve body is provided with a first floating cavity, a second floating cavity, an oil return cavity, a first input port, a second input port, a third input port, a first output port, a second output port and a third output port which are matched with the main valve core;

when the main valve core is in the first direction changing position and the third direction changing position, the first floating cavity and the second floating cavity are not communicated; when the main valve core is in the second direction changing position, the first floating cavity is communicated with the second floating cavity;

when the main valve core is in the first direction changing position and the second direction changing position, the third input port is not communicated with the third output port; when the main valve core is in a third reversal position, the first input port is closed, and the third input port is communicated with the third output port.

It further comprises the following steps: the left side of the valve body is provided with the first floating cavity and the oil return cavity, and the right side of the valve body is provided with the second floating cavity and the other oil return cavity; the middle part of the valve body is provided with a first input port, a second input port, a third input port, a first output port, a second output port and a third output port, and the second input port is communicated with the two oil return cavities.

The first input port, the second input port, the third input port and the third output port are all positioned in a first plane direction; the first output port and the second output port are both positioned in a second plane direction perpendicular to the first plane direction.

And a valve groove k2 and a central hole channel k1 which are used for communicating the first floating cavity with the oil return cavity are formed at the right end of the main valve core.

Compared with the prior art, the utility model has the advantages of it is following:

1. on the basis of not additionally increasing a hydraulic element, the floating function of the feed oil cylinder associated with the reverse rotation of the hydraulic motor is realized;

2. the multi-way valve runner is simpler and more convenient, the whole multi-way valve runner is more flat and smaller, the weight is light, the height of the multi-way valve can be effectively reduced, the use is easy, and the arrangement and the use in the whole machine are convenient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation of the invention. In the drawings:

FIG. 1 is a schematic diagram of a downhole drilling rig;

fig. 2 is a schematic view of a hydraulic principle of an embodiment of the present invention;

fig. 3 is a schematic structural view of a valve body according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a typical three-position six-way open center multi-way valve in the prior art.

In the figure: 1-a first reversing valve; 2-a second reversing valve; 6, hydraulic locking; 7-a float valve; 8-a hydraulic motor; 9-a feeding oil cylinder; 10-a gripper; 11-a chuck; 16-relief valve; 17-a hydraulic pump; s-main spool; z1-rig frame; z2-drill rod.

Detailed Description

The technical solution of the present invention is further explained by the attached drawings.

In the structure of the down-hole drilling machine shown in fig. 1, a hydraulic motor 8 drives a chuck 11 to rotate, a feed cylinder 9 drives the hydraulic motor 8 to move forward or backward together with the chuck 11, a holder 10 is arranged at the front end of a machine frame Z1 of the drilling machine, and a drill rod Z2 passes through the central holes of the chuck 8 and the holder 11. The drill pipe Z2 is always clamped and rotated to drill or withdraw from the coal seam through the switch control of the clamp 10 and the chuck 11, so that the downhole drilling operation is realized.

Referring to fig. 2 and 3, a floating valve structure includes a first direction valve 1 and a floating valve 7 which are integrated, and a main valve core s is composed of a direction valve core and a floating valve core which are integrated. The main spool s is mounted in the spool bore of the valve body. The upper two sides of the valve body are provided with a first floating cavity, a second floating cavity and an oil return cavity, and the middle part of the valve body is provided with a first input port, a second input port, a third input port, a first output port, a second output port and a third output port. The main spool s has 3 shift bits, including a first shift bit a1 on the left, a third shift bit c1 in the middle, and a second shift bit b1 on the right.

Because the valve core of the float valve 7 and the first reversing valve 1 form an integrated main valve core s, the float valve 7 and the first reversing valve 1 have synchronous motion;

for the float valve 7:

when the main valve core s is positioned at the first transposition site a1 and the third transposition site c1, the first floating cavity 7a, the second floating cavity 7b and the oil return cavity 7t of the floating valve 7 are not communicated;

when the main valve core s is located at the second steering position b1, the floating valve 7 is synchronously switched to the right steering position, and at the moment, the first floating cavity 7a, the second floating cavity 7b and the oil return cavity 7t of the floating valve 7 are communicated, so that the floating function can be realized.

For the first directional control valve 1:

when the main valve element s is positioned at the middle position, namely the third steering position c1, the oil flows to the third output port 1ct through the first input port 1p and the middle position channel, namely the third input port 1cp, and enters the next working valve;

when the main valve core s is reversed to the first reversing position b1 leftward, a passage from the third input port 1cp to the third output port 1ct is closed, the second output port 1b is communicated with the first input port 1p, and the right flow passage of the first output port 1a is communicated with the right flow passage of the second input port 1 t;

when the main valve spool s is shifted to the second shift bit b1 to the right, the passage from the third input port 1cp to the third output port 1ct is closed, the first output port 1a communicates with the first input port 1p, and the second output port 1b communicates with the left flow passage of the second input port 1 t.

In order to further reduce the volume of the valve body, the oil passage arrangement of the valve body is optimized, and compared with the conventional open-center six-way multi-way valve structure, the volume of the valve body is further reduced.

Fig. 4 is a schematic diagram of a typical three-position, six-way, center multiplex valve with arrows showing the main flow paths of hydraulic oil within the valve, these cast runners forming flow paths that are distributed primarily in a horizontal plane transverse to all of the spools and a vertical plane perpendicular to the cross-section. The flow passage arrangement scheme has the problems that firstly, the size of the valve body in the vertical direction is large, secondly, the casting flow passage sand core is complex, needs to be bonded and assembled, and has the defects of wrong mold, complex process and the like.

Referring to fig. 3, in this embodiment, the first input port 1p, the second input port 1t, the third input port 1cp and the third output port 1ct which are communicated with the main valve core s are casting runners, and all are in the same plane direction, the casting of the valve body is simple, and the casting sand core can be opened at one time without bonding. The remaining first output port 1a and second output port 1b are perpendicular to the above-mentioned plane, but are both simple machining runners, and do not affect the valve body height and the casting difficulty. Comparing the valve body structures of fig. 3 and 4, it can be seen that the valve bodies with two different flow passage arrangements have the same functions except the floating function. However, the valve body structure of the embodiment shown in fig. 3 has lower height of the valve body and flatter structure because the casting runners are all in the same plane, and the casting is simpler and easier.

Example two

Referring to fig. 2 and 3, the multi-way valve includes the float valve structure described in the first embodiment, as well as the relief valve 16, the second directional valve 2, and the hydraulic lock 6. The overflow valve is connected in front of the first input port and the third input port, the third output port is connected with the second reversing valve, and the second reversing valve is connected with the hydraulic lock. The first floating cavity and the second floating cavity are respectively and correspondingly connected to two oil outlets of the hydraulic lock.

The multiway valve body is provided with an oil port A1, an oil port B1, an oil port A2, an oil port B2, an oil port C, an oil port T1 and an oil port P1;

the port P1 is connected to the hydraulic pump 17. The first input port 1P and the third input port 1cp are connected with a port P1, and the second input port 1cp and the oil return cavity 7T are connected with an oil port T1; the first output port 1a is connected to the port a1, the second output port 1B is connected to the port B1, and the third output port 1ct is connected to the second selector valve 2. The port a1 and the port B1 are connected to both ends of the hydraulic motor 8. The first floating cavity is connected with the oil port A2, and the second floating cavity is connected with the oil port B2; the oil port A2 and the oil port B2 are connected with two ends of the feed cylinder 9. And an output port in the second reversing valve, which is not communicated with the hydraulic lock, is connected with the oil port C.

When in use, the utility model is used for cleaning the inner wall of the tank,

when the main valve core s moves to the second steering position b1 leftwards, hydraulic oil output from the hydraulic pump 17 enters the second output port 1b to drive the hydraulic motor 8 to rotate reversely, meanwhile, the second floating cavity 7b is communicated with the oil return cavity 7t through the left control edge of the main valve core s, the first floating cavity 7a reaches the oil return cavity 7t after passing through a valve groove k2 and a central hole channel k1 on the right side of the main valve core s, and is communicated with the second floating cavity 7b, and the feed oil cylinder 9 realizes a floating function;

when the spool s moves to the right to the first shift position a1 or stays at the third shift position c1 (i.e., the neutral position), the first floating chamber 7a and the second floating chamber 7b are not communicated, and the feed cylinder 9 does not respond to the forward and reverse rotation signals of the hydraulic motor 8.

The embodiments of the float valve structure described above may be applied to multiple-way valves for various drilling machines, such as coal mine downhole drilling machine multiple-way valves. In these multiple-way valves, a reversing valve may be included that controls the movement of the feed cylinder, as well as any of the embodiments of the float valve arrangement described above.

In the description of the present invention, the terms "first", "second", "input" and "output" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance, relative quantity or relative position, and the indicated orientation or positional relationship is the orientation or positional relationship shown on the basis of the drawings, and is for convenience only to facilitate description of the present invention and to simplify description, and does not indicate or imply that the device or element referred to must have a particular orientation, quantity, or be of particular construction and operation, and therefore should not be construed as limiting the present invention.

In the description and drawings of the present invention, the "directional control valve" may be a manual control, a hydraulic pilot control, an electric pilot control, an electro-hydraulic pilot control, or a combination of the above-mentioned various control modes or structural forms, and the description in the specification and the drawings are only for the purpose of description and are not to be construed as limiting the present invention.

In the description of the present invention, the terms "communicate" and "connect" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically coupled, may be electrically coupled, may be directly coupled, may be indirectly coupled through an intermediary, or may be coupled between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or replaced by other means, without departing from the spirit of the invention, which is intended to cover the scope of the invention as claimed.

Claims

1. A float valve structure characterized by: the reversing valve core and the floating valve core form an integrated main valve core, and the main valve core is arranged in a valve core hole of the valve body; the valve body is provided with a first floating cavity, a second floating cavity, an oil return cavity, a first input port, a second input port, a third input port, a first output port, a second output port and a third output port which are matched with the main valve core;

2. A float valve construction in accordance with claim 1 wherein: the left side of the valve body is provided with the first floating cavity and the oil return cavity, and the right side of the valve body is provided with the second floating cavity and the other oil return cavity; the middle part of the valve body is provided with a first input port, a second input port, a third input port, a first output port, a second output port and a third output port, and the second input port is communicated with the two oil return cavities.

3. A float valve construction in accordance with claim 2 wherein: the first input port, the second input port, the third input port and the third output port are all positioned in a first plane direction; the first output port and the second output port are both positioned in a second plane direction perpendicular to the first plane direction.

4. A float valve construction in accordance with claim 2 wherein: and a valve groove k2 and a central hole channel k1 which are used for communicating the first floating cavity with the oil return cavity are formed at the right end of the main valve core.