CN216842450U - Variable control structure, variable motor and engineering machinery - Google Patents

Abstract

The application provides a variable control structure, a variable motor and engineering machinery. The variable valve mechanism comprises a valve sleeve and a valve core, the valve sleeve comprises an oil inlet, and the valve core is movably arranged in the valve sleeve; the adjusting mechanism is arranged at one end of the valve core and comprises an adjusting elastic piece and a variable seat, the adjusting elastic piece is supported between the valve core and the variable seat, an oil hole is formed in the variable seat, and the oil hole is used for communicating a space of the variable seat facing one side of the valve core with a space of the variable seat facing one side of the valve core away from the valve core. By using the structure, the oil pressure of each part of the variable seat is basically consistent, the position accuracy of the variable seat is ensured, the pilot pressure regulation accuracy is further ensured, the variable control reliability is improved, and the defect that the variable control reliability of the variable motor in the prior art is poor is overcome.

Description

Variable control structure, variable motor and engineering machinery

Technical Field

The utility model relates to a hydraulic component technical field, concretely relates to variable control structure, variable motor and engineering machine tool.

Background

With the rapid development of the engineering machinery industry, the rotary drilling rig widely applied to the field of piling is more and more concerned. The main action of the rotary drilling rig is the lifting and lowering of the drill rod, and the lifting and lowering are under the loaded and unloaded working conditions, so that the requirements of high speed and low speed are met for a power mechanism for driving the lifting and lowering of the drill rod.

The power mechanism that drives the drill pipe up and down is typically a variable displacement motor. At present, when a variable motor is subjected to variable control, the following modes are often adopted: firstly, moving the variable seat, changing the expansion amount of the adjusting elastic element, further changing the acting force of the adjusting elastic element on the valve core of the variable valve, and adjusting the initial pilot pressure; and then, the valve core is driven to move through the pilot control oil way proportion, so that variable control is realized. However, when such a design is used, the oil pressure applied to the variable seat may be different from each other, which may cause the position of the variable seat to change, and thus the reliability of variable control cannot be ensured.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the present invention lies in overcoming the poor reliability defect of the variable displacement motor in the prior art for variable control, thereby providing a variable displacement control structure, a variable displacement motor and an engineering machine.

In order to solve the above problem, the utility model provides a variable control structure, it includes variable valve mechanism and adjustment mechanism. The variable valve mechanism comprises a valve sleeve and a valve core, the valve sleeve comprises an oil inlet, and the valve core is movably arranged in the valve sleeve; the adjusting mechanism is arranged at one end of the valve core and comprises an adjusting elastic piece and a variable seat, the adjusting elastic piece is supported between the valve core and the variable seat, an oil hole is formed in the variable seat and is used for communicating a space of the variable seat facing one side of the valve core with a space of the variable seat facing one side of the valve core.

Alternatively, the oil hole is provided in an end wall of the variable seat near one end of the spool.

Optionally, the oil hole is provided in plurality in the circumferential direction of the variable seat.

Optionally, a stepped groove is formed in one end, close to the valve core, of the variable seat, and one end, facing the valve core, of the variable seat, and one end of the adjusting elastic part extends into the stepped groove and abuts against the bottom of the stepped groove.

Optionally, the adjusting mechanism further comprises an adjusting ejector rod, and the first end of the adjusting ejector rod is abutted to the variable seat to adjust or fix the position of the variable seat.

Optionally, the end surface of the first end of the adjusting ejector rod is set to be a plane; one end of the variable seat close to the valve core is provided with an inclined plane on one side of the variable seat facing the valve core, and the variable seat is abutted with the end face of the first end of the adjusting ejector rod through the inclined plane.

Optionally, the adjusting mechanism further comprises an adjusting seat, the adjusting elastic member is mounted on the adjusting seat, and the adjusting seat provides elastic force for the valve core.

Optionally, the adjusting mechanism further comprises a variable elastic element, and the variable elastic element is arranged on one side, opposite to the valve core, of the variable seat to support the variable seat.

The utility model also provides a variable motor, it includes casing and variable control structure. Wherein, the variable control structure is arranged at the end part of the shell, and the variable control structure is the variable control structure as described above.

The utility model also provides an engineering machine tool, it includes as above variable motor.

The utility model has the advantages of it is following:

1. the variable seat is provided with the oil hole, so that the space of the variable seat facing one side of the valve core and the space of the variable seat backing to one side of the valve core can be communicated through the oil hole, the oil pressure on each part of the variable seat is basically consistent, the position accuracy of the variable seat is ensured, the expansion amount of the elastic piece and the pilot pressure regulation accuracy are further ensured, and the reliability of variable control is improved.

2. The oil hole is formed in the end wall of one end, close to the valve core, of the variable seat, so that stress of the variable seat can be balanced.

3. Through making the setting of adjusting elastic component and stretching into the ladder groove, can reduce the contact length between adjusting elastic component and the variable seat, reduce the frictional heat that adjusts the elastic component and receive, reduce the fatigue fracture risk of adjusting the elastic component.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating an overall structure of a variable control structure according to an embodiment of the present invention;

fig. 2 is a partially enlarged schematic view illustrating a variable control structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram illustrating a variable seat in a variable control structure according to an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a variable displacement motor according to an embodiment of the present invention.

Description of the reference numerals:

10. a variable valve mechanism; 11. a valve housing; 111. an oil inlet; 12. a valve core; 13. a valve body; 131. a pilot control oil path; 20. an adjustment mechanism; 21. adjusting the elastic member; 22. a variable seat; 221. an oil hole; 222. a stepped groove; 2221. a first caliber section; 2222. a second caliber section; 223. a slanted plane; 23. adjusting the ejector rod; 24. an adjusting seat; 25. a variable elastic member; 30. an end cap; 31. a through hole inner cavity; 100. a housing; 200. a variable control structure.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The present embodiment provides a variable control structure, as shown in fig. 1 and 2, which includes a variable valve mechanism 10 and an adjusting mechanism 20. The variable valve mechanism 10 includes a valve housing 11 and a valve core 12, the valve housing 11 includes an oil inlet 111, and the valve core 12 is movably disposed in the valve housing 11. The adjusting mechanism 20 is arranged at one end of the valve core 12, the adjusting mechanism 20 comprises an adjusting elastic part 21 and a variable seat 22, the adjusting elastic part 21 is supported between the valve core 12 and the variable seat 22, an oil hole 221 is formed in the variable seat 22, and the oil hole 221 is used for communicating a space of the variable seat 22 facing to the valve core 12 and a space of the variable seat 22 facing away from the valve core 12.

According to the arrangement, when the variable seat 22 is moved, oil in the cavity where the variable seat 22 is located can flow through the oil hole 221 and simultaneously enter the space of the variable seat 22 facing the valve core 12 and the space of the variable seat 22 facing away from the valve core 12, so that the oil pressure on each part of the variable seat 22 can be basically consistent, the influence of the oil pressure on the stress of the variable seat 22 is avoided, and the change of the position of the variable seat 22 is ensured to meet the adjustment expectation.

During the movement of the variable seat 22, the adjusting elastic member 21 may be extended or shortened. When the variable seat 22 stops moving, since the variable seat 22 can reach the expected position according to the adjustment expectation, the expansion and contraction amount of the adjusting elastic member 21 can be ensured to meet the adjustment expectation, and further the accuracy of the acting force applied by the adjusting elastic member 21 to the valve core 12 and the accuracy of the initial pilot pressure adjustment can be ensured. Then, pressure oil is introduced into the valve housing 11 through the oil inlet 111, and the valve core 12 is controlled to move, so that reliable variable control can be realized.

In the present embodiment, as shown in fig. 1 and 2, the variable valve mechanism 10 further includes a valve body 13. The valve body 13 is sleeved outside the valve sleeve 11. A pilot control oil path 131 is provided on the valve body 13, and the pilot control oil path 131 is communicated with an inlet of the oil inlet 111 to provide pressure oil. Referring again to fig. 1 and 2, the variable control structure further includes an end cap 30. The end cap 30 has a through-hole cavity 31, and the variable valve mechanism 10 is disposed at one end of the through-hole cavity 31. The adjusting elastic member 21 and the variable seat 22 are both disposed in the through-hole inner cavity 31. It can be understood that the cavity in which the variable seat 22 is located is the through hole cavity 31.

Since the structures of the valve housing 11, the valve core 12, the valve body 13, and the like in the variable valve mechanism 10 are all the prior art, detailed description thereof is omitted, and only the configuration of the adjustment mechanism 20 will be further described below.

As for the variable seat 22, as shown in fig. 2, the oil hole 221 is provided in the end wall of the variable seat 22 at the end close to the spool 12, so as to further facilitate the balance of the force applied to the variable seat 22. Specifically, considering that the variable seat 22 is sleeved in the through hole inner cavity 31 and moves along the axial direction of the through hole inner cavity 31, the unbalanced axial force is the main cause of the position change of the variable seat 22. Therefore, the oil hole 221 is formed in the end wall of the variable seat 22 close to the valve element 12, so that oil can be guided to flow to two axial sides of the end wall at the same time, the axial stress of the variable seat 22 can be balanced better, and the position of the variable seat 22 is prevented from being changed due to the influence of oil pressure.

Preferably, the oil holes 221 are provided in a plurality along the circumferential direction of the variable seat 22, so as to be more favorable for guiding the oil to flow, so that the force applied to each position of the variable seat 22 is more balanced, and the influence of the oil pressure on the position of the variable seat 22 is reduced to the greatest extent. The axial direction of the single oil hole 221 may be parallel to the axial direction of the variable seat 22, or may be inclined at a certain angle with respect to the axial direction of the variable seat 22, and is not particularly limited herein.

Further, as shown in fig. 2, at one end of the variable seat 22 close to the valve core 12, one side of the variable seat 22 facing the valve core 12 is provided with a stepped groove 222, and one end of the adjusting elastic member 21 extends into the stepped groove 222 and abuts against the bottom of the stepped groove 222, so as to realize stable installation of the adjusting elastic member 21. At this time, along the axial direction of the variable seat 22, since only part of the stepped groove 222 is in contact with the adjusting elastic element 21, the contact length between the adjusting elastic element 21 and the variable seat 22 can be reduced, so as to reduce the friction between the adjusting elastic element 21 and the variable seat 22, reduce the friction heat received by the adjusting elastic element 21, and reduce the risk of fatigue fracture of the adjusting elastic element 21.

In this embodiment, referring to fig. 2 and 3, the adjusting elastic member 21 is provided as an adjusting spring, and the stepped groove 222 includes a first caliber section 2221 and a second caliber section 2222. The first caliber section 2221 and the second caliber section 2222 are sequentially arranged in a direction from the groove bottom of the stepped groove 222 to the outside of the groove, and the radial dimension of the second caliber section 2222 is greater than that of the first caliber section 2221. At this time, the adjusting elastic member 21 is inserted into the stepped groove 222 and tightly fitted with the first caliber section 2221 without contacting the second caliber section 2222, so that not only can stable installation of the adjusting elastic member 21 be realized, but also frictional heat applied to the adjusting elastic member 21 can be reduced, and the risk of fatigue fracture of the adjusting elastic member 21 can be reduced.

As shown in fig. 1 and 2, the adjusting mechanism 20 further includes an adjusting ram 23, and a first end of the adjusting ram 23 abuts against the variable seat 22 to adjust or fix the position of the variable seat 22. In the embodiment, the first end of the adjusting mandril 23 passes through the valve body 13 and extends into the through hole inner cavity 31 to be abutted with the variable seat 22; the second end of the adjusting ejector 23 extends out of the valve body 13. When the adjusting rod 23 is rotated, it can drive the variable seat 22 to move, so as to change the position of the variable seat 22.

Preferably, the end surface of the first end of the adjusting jack 23 is provided as a flat surface. At one end of the variable seat 22 close to the valve body 12, a slanted plane 223 is provided on the variable seat 22 on the side facing the valve body 12, and the variable seat 22 abuts against the end face via the slanted plane 223. With the above arrangement, when the adjusting jack 23 is pressed, the adjusting jack 23 and the variable seat 22 are held in stable contact, and the pressure component for generating the frictional force is reduced, thereby reducing the frictional force between the adjusting jack 23 and the variable seat 22.

In this embodiment, the adjusting mandril 23 is provided as an adjusting screw which is in threaded connection with the valve body 13 to realize installation, and the inclined plane 223 is arranged perpendicular to the axis of the adjusting screw.

In other structures, as shown in fig. 1, the adjusting mechanism 20 further includes an adjusting seat 24, and the adjusting elastic member 21 is mounted on the adjusting seat 24, and provides an elastic force to the valve core 12 through the adjusting seat 24, so as to ensure that the valve core 12 is stressed more stably.

Referring again to fig. 1, the adjustment mechanism 20 further includes a variable elastic member 25, and the variable elastic member 25 is disposed on a side of the variable seat 22 opposite to the valve core 12 to support the variable seat 22. Specifically, when the adjusting push rod 23 is rotated to move the variable seat 22, the variable seat 22 can always move along with the adjusting push rod 23 under the elastic action of the variable elastic element 25; when the adjusting push rod 23 stops rotating, the variable elastic element 25 and the adjusting push rod 23 cooperate to keep the variable seat 22 relatively fixed. In this embodiment, the variable elastic member 25 is provided as a variable spring, which is also installed in the through-hole cavity 31.

Referring to fig. 1, the adjustment mechanism 20 as a whole operates to adjust the initial pilot pressure as follows:

(1) rotating the adjusting mandril 23 along the first direction to make the variable seat 22 move downwards, and compressing the variable elastic element 25; at the same time, the compression amount of the adjusting elastic member 21 is reduced, and the acting force applied to the valve core 12 through the adjusting seat 24 is correspondingly reduced, so that the initial pilot pressure can be reduced;

(2) rotating in a second direction opposite to the first direction to move the variable seat 22 upwards and extend the variable elastic element 25; at the same time, the amount of compression of the adjustment spring 21 increases, and the force applied to the spool 12 by the adjustment seat 24 increases accordingly, so that the initial pilot pressure can be increased.

The present embodiment also provides a variable displacement motor, which includes a housing 100 and a variable displacement control structure 200, as shown in fig. 4. Wherein the variable control structure 200 is disposed at an end of the housing 100, and the variable control structure 200 is the variable control structure as described above.

In this embodiment, the variable control structure 200 is fitted to the housing 100 through the end cap 30 to achieve the installation. The reliability of variable motor variable control can be well ensured by the variable control structure 200. Preferably, the variable displacement motor in the present embodiment is of a skew shaft type.

The embodiment also provides a working machine which comprises the variable displacement motor. The working machine may exemplarily be an excavator, a crane, a pump truck, or the like.

According to the above description, the present application has the following advantages:

1. the oil hole 221 is formed in the variable seat 22, so that the position of the variable seat 22 can be basically prevented from being influenced by oil pressure, the position accuracy of the variable seat 22 is ensured, the expansion amount of the elastic piece 21 and the pilot pressure are further ensured to be adjusted, and the reliability of variable control is improved;

2. by arranging the stepped groove 222 on the variable seat 22 and installing the adjusting elastic part 21 in the stepped groove 222, the contact length between the adjusting elastic part 21 and the variable seat 22 can be reduced, the friction heat borne by the adjusting elastic part 21 is reduced, and the fatigue fracture risk of the adjusting elastic part 21 is reduced;

3. for the whole variable control structure, the initial pilot pressure can be adjusted by adjusting the ejector rod 23 to move the variable seat 22, and proportional control is performed through the pilot control oil way 131, so that the structure is compact, and the control is reliable.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A variable control structure, comprising:

the variable valve mechanism (10) comprises a valve sleeve (11) and a valve core (12), the valve sleeve (11) comprises an oil inlet (111), and the valve core (12) is movably arranged in the valve sleeve (11);

the adjusting mechanism (20) is arranged at one end of the valve core (12), the adjusting mechanism (20) comprises an adjusting elastic piece (21) and a variable seat (22), the adjusting elastic piece (21) is supported between the valve core (12) and the variable seat (22), an oil hole (221) is formed in the variable seat (22), and the oil hole (221) is used for communicating a space of the variable seat (22) facing one side of the valve core (12) with a space of the variable seat (22) facing away from one side of the valve core (12).

2. The variable control structure according to claim 1, characterized in that the oil hole (221) is provided in an end wall of one end of the variable seat (22) near the spool (12).

3. The variable control structure according to claim 1, characterized in that the oil hole (221) is provided in plurality in a circumferential direction of the variable seat (22).

4. The variable control structure according to claim 1, wherein a stepped groove (222) is provided on a side of the variable seat (22) facing the spool (12) at an end of the variable seat (22) close to the spool (12), and an end of the adjusting elastic member (21) protrudes into the stepped groove (222) and abuts against a bottom of the stepped groove (222).

5. The variable control structure according to any one of claims 1 to 4, characterized in that the adjusting mechanism (20) further comprises an adjusting jack (23), a first end of the adjusting jack (23) abutting against the variable seat (22) to adjust or fix the position of the variable seat (22).

6. A variable control structure according to claim 5, characterized in that the end surface of the first end of the adjusting jack (23) is provided as a plane;

one end of the variable seat (22) close to the valve core (12) is provided with an inclined plane (223), and one side, facing the valve core (12), of the variable seat (22) is provided with an inclined plane (223), and the variable seat (22) is abutted to the end face of the first end of the adjusting ejector rod (23) in a fit mode through the inclined plane (223).

7. Variable control structure according to any of claims 1 to 4, characterized in that the adjustment mechanism (20) further comprises an adjustment seat (24), the adjustment spring (21) being mounted on the adjustment seat (24), the valve core (12) being provided with a spring force by means of the adjustment seat (24).

8. Variable control structure according to any of claims 1 to 4, characterized in that the adjustment mechanism (20) further comprises a variable elastic member (25), the variable elastic member (25) being provided on a side of the variable seat (22) facing away from the spool (12) to support the variable seat (22).

9. A variable displacement motor, comprising:

a housing (100);

a variable control structure (200) provided at an end of the housing (100), the variable control structure (200) being as set forth in any one of claims 1-8.

10. A working machine, characterized by comprising a variable displacement motor according to claim 9.

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