阅读说明：本技术 一种带限位功能的变幅平衡阀 (Amplitude-variable balance valve with limiting function ) 是由 王刚 卢宇 李新 邹泉敏 于 2020-07-27 设计创作，主要内容包括：本发明公开了一种带限位功能的变幅平衡阀,属于起重机械液压控制技术领域,包括：阀体,其内设有换向阀腔；换向阀杆,其插装在换向阀腔内并可水平移动,换向阀杆的中部段直径小于尾部段的直径；A口,其开设在阀体上,A口与换向阀腔通过第一通道相连通,A口为阀口并与液压阀口连接；B口,其开设在阀体上,B口与换向阀腔通过第二通道相连通,B口为负载口并与液压缸无杆腔连接；第一连接通道,其连通第一通道与第二通道,且第一连接通道内孔的直径等于阀杆尾部段的直径。本发明提供的带限位功能的变幅平衡阀,使得起重机在变幅起到一定角度后会自动限位,避免在吊起大重量的物件时,由于变幅起的角度过大而存在翻车的安全隐患问题。(The invention discloses a variable amplitude balance valve with a limiting function, belonging to the technical field of hydraulic control of hoisting machinery, comprising: the valve body is internally provided with a reversing valve cavity; the reversing valve rod is inserted in the reversing valve cavity and can horizontally move, and the diameter of the middle section of the reversing valve rod is smaller than that of the tail section; the port A is arranged on the valve body and communicated with the reversing valve cavity through a first channel, and the port A is a valve port and is connected with the hydraulic valve port; the port B is arranged on the valve body and communicated with the reversing valve cavity through a second passage, and the port B is a load port and is connected with a rodless cavity of the hydraulic cylinder; and the first connecting channel is communicated with the first channel and the second channel, and the diameter of the inner hole of the first connecting channel is equal to that of the tail section of the valve rod. The variable amplitude balance valve with the limiting function enables a crane to automatically limit after the variable amplitude is raised to a certain angle, and avoids the potential safety hazard problem of car turning caused by the overlarge amplitude raising angle when a heavy object is lifted.)

1. The utility model provides a take limit function's change width of cloth balanced valve which characterized in that includes:

the valve body is internally provided with a reversing valve cavity;

the reversing valve rod is inserted in the reversing valve cavity and can horizontally move in the reversing valve cavity;

the port A is arranged on the valve body and communicated with the reversing valve cavity through a first channel, and the port A is a valve port;

the port B is arranged on the valve body and communicated with the reversing valve cavity through a second passage, and the port B is a load port;

the first connecting channel is communicated with the second channel, the middle section of the reversing valve rod is located at the first connecting channel, and the diameter of the inner hole of the first connecting channel is equal to that of the tail section of the valve rod.

2. The variable amplitude balance valve with the limiting function according to claim 1, wherein the reversing valve cavity is sequentially provided with a first reversing valve cavity, a second reversing valve cavity and an air release cavity from outside to inside, the first reversing valve cavity is communicated with the first channel, the second reversing valve cavity is communicated with the second channel, the air release cavity is a space between the tail of the reversing valve rod and the valve body, and the air release cavity is communicated with the outside through an air release screw plug.

3. The variable-amplitude balance valve with the limiting function according to claim 1, wherein a connecting shaft for mounting a steel wire rope is arranged at the head of the reversing valve rod, the reversing valve rod is further connected with the valve body through a reversing spring seat, and the reversing spring seat is close to the head of the reversing valve rod.

4. The variable-amplitude balance valve with the limiting function according to claim 1, wherein a one-way valve spring seat is further inserted into the valve body, and a G port for measuring the pressure of the B port is formed in the one-way valve spring seat.

5. The variable amplitude balance valve with the limiting function according to claim 4, wherein the head of the one-way valve spring seat is provided with a one-way valve core, and the head of the one-way valve core is provided with a conical surface which is movably and hermetically connected with the second channel.

6. The variable amplitude balance valve with the limiting function according to claim 1, wherein a balance valve cavity is further arranged in the valve body, the balance valve cavity comprises a first balance valve cavity and a second balance valve cavity, the first balance valve cavity is communicated with the first reversing valve cavity through a third passage, and the second passage is communicated with the third passage through a second connecting passage.

7. The variable amplitude balance valve with the limiting function as claimed in claim 6, wherein a balance valve rod is inserted in the balance valve cavity, and the balance valve rod can horizontally move in the balance valve cavity.

8. The variable-amplitude balance valve with the limiting function according to claim 7, wherein one end of the balance valve rod is connected with an adjusting rod through a balance spring seat, a balance valve sleeve is sleeved on the balance spring seat, a balance valve core is arranged at the other end of the balance valve rod, and the balance valve core is located in the second balance valve cavity.

9. The variable amplitude balance valve with the limiting function as claimed in claim 8, further comprising a balance valve seat, wherein the balance valve seat is close to the balance valve sleeve, and the balance valve rod penetrates through the balance valve seat.

10. The variable-amplitude balance valve with the limiting function according to claim 8, wherein an X port for oil inlet is further formed in the valve body, the X port is communicated with the right end of the balance valve core, and a damping which has a filtering effect is installed at an oil inlet of the X port.

Technical Field

The invention belongs to the technical field of hydraulic control of hoisting machinery, and particularly relates to a variable amplitude balance valve with a limiting function.

Background

The amplitude variation of the crane means that the crane boom is driven to drop or rise through the angle change of the crane boom. The luffing mechanism can enlarge the operation range of the crane, improve the working maneuverability and improve the production efficiency; the position of the fetching device is changed to meet the requirements of lifting capacity and loading and unloading positions; the trafficability of the crane during non-working is improved.

In the amplitude variation mechanism, the amplitude variation balance valve plays a vital role, and the angle of the suspension arm is changed through the action of the amplitude variation balance valve to realize the lifting and descending of the suspension arm, the speed limit in the action process and the suspension arm to be kept at any position in the air.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a variable amplitude balance valve with a limiting function, which can control a variable amplitude angle.

The purpose of the invention can be realized by the following technical scheme:

a variable amplitude balance valve with a limiting function comprises:

the valve body is internally provided with a reversing valve cavity;

the reversing valve rod is inserted in the reversing valve cavity and can horizontally move in the reversing valve cavity;

the port A is arranged on the valve body and communicated with the reversing valve cavity through a first channel, and the port A is a valve port;

the port B is arranged on the valve body and communicated with the reversing valve cavity through a second passage, and the port B is a load port;

the first connecting channel is communicated with the second channel, the middle section of the reversing valve rod is located at the first connecting channel, and the diameter of the inner hole of the first connecting channel is equal to that of the tail section of the valve rod.

As a further improvement of the invention, the reversing valve cavity is sequentially provided with a first reversing valve cavity, a second reversing valve cavity and an air release cavity from outside to inside, the first reversing valve cavity is communicated with the first channel, the second reversing valve cavity is communicated with the second channel, the air release cavity is a space between the tail part of the reversing valve rod and the valve body, and the air release cavity is communicated with the outside through an air release screw plug.

As a further improvement of the invention, the head of the reversing valve rod is provided with a connecting shaft for installing a steel wire rope, the reversing valve rod is also connected with the valve body through a reversing spring seat, and the reversing spring seat is close to the head of the reversing valve rod.

As a further improvement of the invention, a one-way valve spring seat is also inserted in the valve body, and a G port for measuring the pressure of the B port is arranged on the one-way valve spring seat.

As a further improvement of the invention, the head of the one-way valve spring seat is provided with a one-way valve core, and the head of the one-way valve core is provided with a conical surface which is movably and hermetically connected with the second channel.

As a further improvement of the invention, a balance valve cavity is further arranged in the valve body, the balance valve cavity comprises a first balance valve cavity and a second balance valve cavity, the first balance valve cavity is communicated with the first reversing valve cavity through a third channel, and the second balance valve cavity is communicated with the second channel.

As a further improvement of the invention, a balance valve rod is inserted in the balance valve cavity and can horizontally move in the balance valve cavity.

As a further improvement of the invention, one end of the balance valve rod is connected with an adjusting rod through a balance spring seat, a balance valve sleeve is sleeved on the balance spring seat, and a balance valve core is arranged at the other end of the balance valve rod.

As a further improvement of the invention, the balance valve further comprises a balance valve seat, the balance valve seat is in contact with the balance valve sleeve, and the balance valve rod penetrates through the balance valve seat.

As a further improvement of the invention, the valve body is also provided with an X port for oil inlet, the X port is communicated with the right end of the balance valve core, and the oil inlet of the X port is provided with a damper.

Compared with the prior art, the invention has the following beneficial effects:

1. the variable amplitude balance valve with the limiting function enables a crane to automatically limit after the variable amplitude is raised to a certain angle, and avoids the potential safety hazard problem of car turning caused by the overlarge amplitude raising angle when a heavy object is lifted.

2. By adjusting the steel wire rope mechanism arranged on the connecting shaft and matching with the reversing valve provided by the invention, the amplitude-variable angle can be adjusted randomly for limiting according to the actual use condition, and the application range is wider.

Drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 2 is a front view of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the embodiment of FIG. 2 taken along direction DD;

FIG. 4 is a schematic diagram of another view of the embodiment of FIG. 2;

fig. 5 is a hydraulic schematic of the embodiment of fig. 1.

In the figure, 100, valve body; 110. a reversing valve rod; 111. a connecting shaft; 112. a reversing spring seat; 120. a first channel; 130. a second channel; 140. a first connecting channel; 150. a first reversing valve cavity; 160. a second reversing valve cavity; 170. an air discharge cavity; 180. an air-release screw plug; 190. a check valve spring seat; 200. a one-way valve core; 210. a balance valve cavity; 220. a third channel; 230. a second connecting channel; 240. a balance valve stem; 241. a balance spring seat; 242. adjusting a rod; 243. a balance valve housing; 244. a balance valve spring; 250. a balanced valve core; 260. a balanced valve seat; 270. and (6) damping.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 5, the present invention provides a variable amplitude balance valve with a limiting function, comprising: valve body 100, reversing valve rod 110, port A, port B and first connecting channel 140.

The reversing valve comprises a valve body 100, a reversing valve cavity is arranged in the valve body 100, a reversing valve rod 110 is inserted in the reversing valve cavity, the reversing valve rod 110 can horizontally move in the reversing valve cavity, the reversing valve rod 110 is of a two-position two-way valve rod structure, and the diameter of the middle section of the reversing valve rod 110 is smaller than that of the tail section of the reversing valve rod.

The port a is arranged on the valve body 100, the port a is communicated with the reversing valve cavity through a first channel 120, and the port a is a valve port and is connected with a hydraulic valve (multi-way valve); the port B is arranged on the valve body 100 and is communicated with the reversing valve cavity through a second channel 130, the port B is a load port and is connected with a rodless cavity of the hydraulic cylinder, namely the port B is connected with one end of the cylinder barrel of the hydraulic cylinder, which is not provided with a piston rod; and a first connecting passage 140 communicating the first passage 120 and the second passage 130, wherein a middle section of the direction changing valve stem 110 is located at the first connecting passage 140, specifically, the first connecting passage 140 is a space between the middle section of the direction changing valve stem 110 and the inner walls of the two side valve bodies 100, and oil can pass through the first connecting passage 140 from the first passage 120 into the second passage 130.

In actual work, when the crane performs amplitude-variable action, oil enters from the port A, enters into the reversing valve cavity through the first passage 120, passes through the first connecting passage 140, enters into the second passage 130, and finally flows out from the port B, when amplitude-variable action reaches a certain angle, the reversing valve rod 110 is pulled outwards by the steel wire rope, because the diameter of the first connecting passage 140 is equal to that of the tail section of the reversing valve rod 110, the reversing valve rod 110 blocks the first connecting passage 140 after being pulled outwards, at this time, the oil cannot enter into the second passage 130 through the first connecting passage 140, the port B for connecting a load is not fed with oil, the crane is limited, the amplitude-variable action cannot be performed continuously, namely, the reversing oil-sealing function is performed, so that the function of the two-position two-way reversing valve is realized, and the maximum angle of amplitude-variable crane action can be controlled, the problem of potential safety hazard of overturning due to overlarge amplitude lifting angle when hoisting heavy objects is avoided, and the safety of work is ensured.

Preferably, the reversing valve cavity is sequentially provided with a first reversing valve cavity 150, a second reversing valve cavity 160 and an air release cavity 170 from outside to inside, the first reversing valve cavity 150 is communicated with the first passage 120, the second reversing valve cavity 160 is communicated with the second passage 130, the first reversing valve cavity 150 and the second reversing valve cavity 160 are sealed by sealing screw plugs on the valve body 100, the air release cavity 170 is a space between the tail part of the reversing valve rod 110 and the valve body 100, and the air release cavity 170 is communicated with the outside through an air release screw plug 180, the air release screw plug 180 can play a role in ventilation, even if the tail part of the reversing valve rod 110 is in a sealing relationship with the valve bodies 100 on both sides, after long-time work, oil may penetrate into the air release cavity 170 from a gap, if the air release screw plug 180 is not arranged, the air release cavity 170 is slowly filled with the oil, so that the reversing valve rod 110 cannot be reset, by arranging the bleeder screw 180, the problem that the reversing valve rod 110 cannot be reset can be avoided.

Preferably, the head of the reversing valve rod 110 is provided with a connecting shaft 111 for installing a steel wire rope, the reversing valve rod 110 is further connected with the valve body 100 through a reversing spring seat 112, the reversing spring seat 112 is close to the head of the reversing valve rod 110, the joint of the reversing spring seat 112 and the valve body 100 is sealed through a sealing ring, and the reversing spring seat 112 can play a role in resetting the reversing valve rod 110.

Preferably, a check valve spring seat 190 is further inserted into the valve body 100, a spring in the check valve spring seat 190 can play a role in resetting, a G port for measuring a pressure of a B port is formed in the check valve spring seat 190, wherein a check valve spool 200 is arranged at the head of the check valve spring seat 190, a conical surface is arranged at the head of the check valve spool 200, and the conical surface is movably and hermetically connected with the second passage 130, specifically, in an initial state, that is, when the crane does not perform a luffing motion, the second passage 130 is blocked by the conical surface at the head of the check valve spool 200, and when the luffing motion is performed, oil enters the second passage 130 through the port a, the first passage 120 and the first connecting passage 140 in sequence, and then the oil pushes open the check valve spool 200 blocking the second passage 130 and then flows into the B port.

Preferably, a balance valve cavity 210 is further arranged in the valve body 100, the balance valve cavity 210 comprises a first balance valve cavity 210 and a second balance valve cavity 210, the first balance valve cavity 210 is communicated with the first reversing valve cavity 150 through a third passage 220, the second passage 130 is communicated with the third passage 220 through a second connecting passage 230, when the crane performs amplitude-changing falling action, oil flows into the valve body 100 from a port B connected with a load, passes through the second connecting passage 230 from the second passage 130, enters the third passage 220, and finally flows into a port A.

Preferably, a balance valve rod 240 is inserted into the balance valve cavity 210, the balance valve rod 240 can move horizontally in the balance valve cavity 210, one end of the balance valve rod 240 is connected with an adjusting rod 242 through a balance spring seat 241, a balance valve sleeve 243 is sleeved on the balance spring seat 241, the connection part of the balance valve sleeve 243 and the valve body 100 is arranged in a sealing manner, a balance valve spring 244 which plays a role in resetting is arranged between the balance spring seat 241 and the adjusting rod 242, in addition, a balance valve core 250 is arranged at the other end of the balance valve rod 240, the balance valve core 250 is positioned in the second balance valve cavity 210, and the balance valve core 250 and the inner walls of the valve body 100 at two sides.

Further, the balance valve seat 260 is fixed in the valve body 100, the balance valve seat 260 is arranged between the inner wall of the valve body 100 in a sealing manner, the balance valve seat 260 is close to the balance valve sleeve 243, the balance valve rod 240 penetrates through the balance valve seat 260, in addition, the part of the balance valve rod 240 inserted into the balance valve sleeve 243 is provided with an inclined side wall, the side wall of the part is provided with an inclined surface, therefore, when the balance valve rod 240 is inserted into the valve body 100, the balance valve rod 240 can penetrate through the balance valve seat 260 until the balance valve rod 240 abuts against the balance valve seat 260, at the moment, the second connecting channel 230 is blocked, namely, the second connecting channel 230 is a gap between the balance valve seat 260 and the balance valve rod 240, only when the balance valve rod 240 is pushed outwards, the balance valve rod 240 is separated from the balance valve seat 260, at the moment, the second connecting channel 230 is not opened, and oil can sequentially pass through, And a third channel 220 to the port a.

Furthermore, an X port for oil inlet is further formed in the valve body 100, the X port is communicated with the balance valve core 250, and a damper 270 is installed at an oil inlet of the X port, when the crane needs to perform amplitude-variable falling, oil is introduced at the X port, the oil passes through the damper 270 and enters the second balance valve cavity 210, and further pushes the balance valve core 250 outwards, at this time, the balance valve rod 240 is separated from the balance valve seat 260, and the oil passes through a gap between the balance valve seat 260 and the balance valve rod 240, namely, the oil passes through the second connecting channel 230 and enters the third channel 220, and finally enters the port a, wherein the damper 270 is arranged to play a role in filtering, so that the anti-shake function is achieved, and the stability of the balance valve during operation is improved.

In the working process from amplitude variation to amplitude variation, in the amplitude variation process, oil enters from the port A, sequentially passes through the first channel 120 and the first connecting channel 140, enters the second channel 130, and pushes away the one-way valve core 200, so that the oil can smoothly flow into the port B through the second channel 130.

After the amplitude of the oil is raised to a certain angle, the reversing valve rod 110 is pulled by the steel wire rope until the rear section of the reversing valve rod 110 blocks the first connecting channel 140, and at the moment, the oil cannot enter the second channel 130 through the first connecting channel 140, which is shown on the crane, namely, the suspension arm of the crane is limited, the amplitude of the oil cannot be continuously raised, and the phenomenon of overturning due to the overlarge amplitude of the oil is prevented.

When the amplitude-variable dropping action is carried out, as the thrust of oil does not exist any more, the reversing valve rod 110 and the one-way valve core 200 are reset under the action of the spring force respectively, the oil is injected into the port X, the oil pushes the balance valve core 250 outwards until the balance valve rod 240 is separated from the balance valve seat 260, at the moment, the second connecting channel 230 is opened, the oil can sequentially pass through the second channel 130, the second connecting channel 230 and the third channel 220 from the port B and finally enters the port A to finish the amplitude-variable dropping action, and when the amplitude-variable dropping action needs to be carried out again, the balance valve rod 240 is reset under the action of the spring force of the balance valve spring 244, so that the reversing valve rod 110 and the balance valve rod 240 can move in a reciprocating and circulating mode along with the amplitude-variable.

The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and the technical scheme also comprises the technical scheme formed by any combination of the technical characteristics. The foregoing is a detailed description of the invention, and it should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the invention, and are intended to be within the scope of the invention.