Damping-adjustable plate-type brake valve capable of controlling power-off active unloading of oil way

Abstract

A damping-adjustable plate type brake valve capable of controlling active unloading during power failure of an oil way comprises a valve body and an electromagnetic valve, an electromagnetic valve connecting channel, a main oil way, an auxiliary oil way and a brake oil way are formed in the valve body, and the main oil way, the auxiliary oil way and the brake oil way are communicated with the electromagnetic valve connecting channel. The control end of the valve element extends into the electromagnetic valve connecting channel to control on-off of the main oil channel, the auxiliary oil channel and the brake oil channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to brake valve technical field, concretely relates to a kind of plate brake valve of control oil circuit power-off active unloading and adjustable damping. BACKGROUND

[0002] The existing same side oil port closed plunger pump with unloading back to neutral position starting switch can mostly only use control valve with mechanical handle, is installed on plunger pump shell component, can only unloading control oil that has acted to main control valve, so that plunger pump rocker (swash plate) back to neutral position, realizes zero displacement output.But because the unloading oil way of original zero position starting switch form is not set in main control oil way, can only realize passive unloading, cannot completely cut off control oil way to prevent control oil from entering variable cylinder, so unloading, braking is not timely or even unloading braking dangerous situation cannot be appeared. SUMMARY

[0003] Therefore, the utility model provides a kind of plate brake valve of control oil circuit power-off active unloading and adjustable damping.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of plate brake valve of control oil circuit power-off active unloading and adjustable damping, including valve body and solenoid valve, the solenoid valve connection channel and main oil passage, auxiliary oil passage and brake oil passage that are communicated with solenoid valve connection channel are formed in the valve body, the solenoid valve has valve core control end, the valve core control end is inserted into solenoid valve connection channel and controls the on-off of main oil passage, auxiliary oil passage and brake oil passage.

[0006] Preferably, connection oil passage is arranged between brake oil passage and solenoid valve connection channel, the connection oil passage has first oil passage part and annular oil passage part, the first oil passage part is arranged through solenoid valve connection channel, and the annular oil passage part is communicated with first oil passage part and brake oil passage respectively.

[0007] Preferably, valve sleeve is sleeved on the valve core control end, the valve core control end has oil passage part and body part, and oil passage gap is formed between the oil passage part and the body part, valve sleeve oil passage hole that is communicated with solenoid valve connection channel and valve sleeve interior is formed in the valve sleeve.

[0008] Preferably, the valve sleeve oil passage hole includes first valve sleeve oil passage hole and second valve sleeve oil passage hole, the valve core control end has power-on state and power-off state, the first valve sleeve oil passage hole is communicated with solenoid valve connection channel in the power-off state of the valve core control end, and the second valve sleeve oil passage hole is in sealed state;The valve core control end is moved in the power-on state of the valve core control end, and the oil passage gap on the valve core control end communicates the first valve sleeve oil passage hole and the second valve sleeve oil passage hole.

[0009] Preferably, the valve sleeve is concave near the first valve sleeve oil passage and the second valve sleeve oil passage, forming a first annular part and a second annular part respectively, and the first annular part and the second annular part form annular cavities with the inner wall of the electromagnetic valve connecting channel.

[0010] Preferably, a damping screw is arranged in the brake oil passage, the damping screw is detachably arranged in the brake oil passage, and a damping hole is arranged on the damping screw to communicate with the inside of the brake oil passage.

[0011] Preferably, a one-way valve mounting channel is further arranged on the valve body, a one-way valve assembly is arranged in the one-way valve mounting channel, and the lower part of the first oil passage part is respectively communicated with the one-way valve mounting channel and the electromagnetic valve connecting channel.

[0012] Preferably, the one-way valve assembly comprises a one-way valve body and a connecting spring, the one-way valve mounting channel has a tapered part, the one-way valve body has a tapered end abutting the tapered part, and the two ends of the connecting spring are respectively abutted against the inner wall of the one-way valve mounting channel and the side end face of the one-way valve body away from the tapered end.

[0013] The beneficial effects of the utility model lie in that the electromagnetic valve is a two-position three-way electromagnetic valve, one end of which is connected with a control power supply, and the other end is connected with the electromagnetic valve connecting channel in the valve body. When the electromagnetic valve is not powered, i.e. when the electromagnetic valve is powered off, the main oil passage is cut off, the main control oil cannot enter, and at the same time, the pressure of the oil liquid in the brake oil passage opens the one-way valve to communicate with the auxiliary oil passage, realizing control oil blocking and brake oil passage unloading. When the electromagnetic valve is powered on, the spool control end moves to the open position, the brake oil passage is connected with the main oil passage, the control oil path is connected, the main control oil passes through the main oil passage, enters the brake oil passage, and then enters the control piston cavity of the pump or motor from the brake oil passage, thereby starting to work. In addition, the design also includes a damping adjusting mechanism, by adjusting the damping size, the flow resistance of the oil liquid in the brake oil passage can be changed, thereby realizing fine control of the speed of the main control oil entering the control piston cavity of the pump or motor. This design realizes adjustable control speed for different host system configuration requirements, and also enhances the stability and safety of the system control process. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creating labor.

[0015] ATTACHMENT Figure 1 It is a structural schematic diagram of the utility model.

[0016] Fig. Figure 2 is a sectional view of the valve body;

[0017] Fig. Figure 3 is a sectional view of the valve body;

[0018] Fig. Figure 4 is a schematic view of the valve body. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] The utility model will be further described below with reference to the drawings in the description.

[0021] The utility model provides the following technical scheme:

[0022] As shown in the figure, Figures 1-4 The utility model discloses a kind of plate brake valve of control oil circuit power-off active unloading and adjustable damping, including valve body 1 and electromagnetic valve 2, electromagnetic valve connection channel 3 and main oil passage 4, auxiliary oil passage 5 and brake oil passage 6 that are communicated with electromagnetic valve connection channel 3 are formed in the valve body 1, the electromagnetic valve 2 has valve core control end 7, the valve core control end 7 is inserted into electromagnetic valve connection channel 3 and controls the on-off of main oil passage 4, auxiliary oil passage 5 and brake oil passage 6.Specifically, in the design, electromagnetic valve 2 is two-position three-way electromagnetic valve 2, one end is connected with control power supply, the other end is connected with electromagnetic valve connection channel 3 in valve body 1.When electromagnetic valve 2 is not powered, valve core control end 7 is in closed position, main oil passage 4 is cut off, main control oil cannot enter, while the pressure of oil liquid in brake oil passage 6 can open one-way valve to be communicated with auxiliary oil passage 5, realize control oil block and brake oil passage 6 unloading, to realize that controlled pump or motor active unloading is controlled.When electromagnetic valve 2 is powered, valve core control end 7 moves to open position, brake oil passage 6 is connected with main oil passage 4, control oil circuit is connected, main control oil passes through main oil passage 4, enters brake oil passage 6, from brake oil passage 6 into the control piston cavity of pump or motor, to start work.In addition, damping adjustment mechanism is also included in the design, by adjusting the size of damping, the flow resistance of oil liquid in brake oil passage 6 can be changed, to realize fine control to brake effect.This design realizes adjustable for different host system configuration needs using different control speed, also enhances the stability and security of system control process.

[0023] The working principle of the design is as follows:

[0024] The control oil enters and exits the plunger pump or plunger motor through the main oil passage 4, the auxiliary oil passage 5 and the brake oil passage 6 on the valve body 1. After the control oil enters the valve body 1 from the main oil passage 4, the oil enters the annular cavity 20 formed between the electromagnetic valve connecting channel 3 and the valve sleeve 11 through the first oil hole. When the electromagnetic valve 2 is not powered, the second valve sleeve oil passage 17 on the valve sleeve 11 is covered by the spool control end 7, and the oil passage gap 14 formed between the oil passage 12 and the body portion 13 on the spool control end 7 connects the electromagnetic valve connecting channel 3 and the first valve sleeve oil passage 16. At this time, the control oil of the plunger pump or motor can only enter the annular cavity 20 and cannot reach other oil ports through the brake valve, i.e., the control oil path is in a cut-off state.

[0025] When the electromagnetic valve 2 is powered, as shown in Figure 2 , the spool control end 7 is actuated from the valve body 1 end to the electromagnet end under the action of the electromagnet, at which time the spool control end 7 separates the electromagnetic valve connecting channel 3 and the first valve sleeve oil passage 16, and the oil passage gap 14 of the spool control end 7 connects the second valve sleeve oil passage 17 and the first valve sleeve oil passage 16. The control oil of the plunger pump or motor enters the annular cavity 20 from the main oil passage 4, then enters the first valve sleeve oil passage 16 of the valve sleeve 11 through the second valve sleeve oil passage 17 on the valve sleeve 11 and the oil passage gap 14 of the spool control end 7. At this time, the control oil can enter the upper part of the first oil passage portion 9, then enter the transition oil passage portion 29 through the annular oil passage portion 10, and the two ends of the transition oil passage portion 29 are respectively connected to the annular oil passage portion 10 and the brake oil passage 6. Then the oil enters the damping hole 22 of the damping plug 21 through the brake oil passage 6, and is output through the oil passage port of the brake oil passage 6 and enters the main control oil path of the plunger pump or plunger motor. In this process, the pressure of the tapered end 28 of the one-way valve body 25 is less than the pressure of the tail end, so the one-way valve assembly 24 is always in a closed state.

[0026] When the vehicle, equipment system is working and needs to brake due to work requirements or unexpected situations, only need to disconnect the electromagnetic iron electric signal, the valve core control end 7 will return to the state of the second valve sleeve oil hole 17 being covered by the valve core control end 7. At this time, due to the structure of the plunger pump or motor, the oil in the internal main control oil circuit needs to be unloaded. The control oil that needs to be unloaded enters the brake valve from the oil port of the brake oil channel 6. At this time, due to the fact that the tail end of the one-way valve assembly 24 does not have pressure control oil input, and is affected by the damping screw plug 21, the pressure of the tapered surface part 27 of the one-way valve installation channel 23 is greater than the pressure of the tail end oil channel, so that the one-way valve body 25 moves to the direction of being compressed by the connecting spring 26, so that the one-way valve installation channel 23 is opened. The unloaded oil enters the tapered surface part 27 of the one-way valve installation channel 23 from the oil channel hole brake oil channel 6, enters the tail end oil channel through the opened one-way valve assembly 24. At this time, the unloaded oil can continue to enter the lower part of the first oil channel part 9, then enter the first valve sleeve oil hole 16 of the valve sleeve 11, and then enter the electromagnetic valve connecting channel 3 through the oil passing gap 14 of the valve core control end 7, and then be discharged from the brake valve body 1 through the auxiliary oil channel 5. This realizes the function of cutting off the main control oil circuit and unloading the pump motor when the brake valve is powered off.

[0027] Further, the brake oil channel 6 and the electromagnetic valve connecting channel 3 are provided with a connecting oil channel 8, the connecting oil channel 8 has a first oil channel part 9 and an annular oil channel part 10, the first oil channel part 9 is provided through the electromagnetic valve connecting channel 3, and the annular oil channel part 10 is in communication with the first oil channel part 9 and the brake oil channel 6 respectively.

[0028] Further, the valve core control end 7 is sleeved with a valve sleeve 11, the valve core control end 7 has an oil passing part 12 and a body part 13, an oil passing gap 14 is formed between the oil passing part 12 and the body part 13, and the valve sleeve 11 is provided with a valve sleeve oil hole 15 in communication with the electromagnetic valve connecting channel 3 and the inside of the valve sleeve 11. Specifically, in the embodiment, the diameter of the valve sleeve oil hole 15 is smaller than the diameter of the oil passing part 12. This design can ensure that a certain throttling effect is generated when the oil passes through the valve sleeve oil hole 15 during braking, thereby further improving the sensitivity and response speed of braking. At the same time, the size of the valve sleeve oil hole 15 can be adjusted according to actual use requirements to achieve the best braking effect. In addition, the body part 13 of the valve core control end 7 and the valve body 1 are provided with a sealing ring, which ensures the sealing performance of the brake oil channel 6, prevents oil leakage, and ensures the safe and reliable operation of the brake system. Through this structure design, the performance of the brake valve is significantly improved, which provides more stable and reliable brake protection for vehicles.

[0029] Further, the valve sleeve oil passage 15 includes a first valve sleeve oil passage 16 and a second valve sleeve oil passage 17, the valve core control end 7 has an energized state and a non-energized state, in the non-energized state, the first valve sleeve oil passage 16 is in communication with the electromagnetic valve connecting channel 3, and the second valve sleeve oil passage 17 is in a sealed state; in the energized state, the valve core control end 7 is moved, and the oil passage gap 14 on the valve core control end 7 communicates the first valve sleeve oil passage 16 and the second valve sleeve oil passage 17. Specifically, in this embodiment, in the energized state of the valve core control end 7, the first valve sleeve oil passage 16 and the second valve sleeve oil passage 17 are communicated with the oil passage gap 14 by moving the valve core control end 7, which can increase the flow area of the oil, reduce the system pressure, and realize the smooth control of the oil distribution process. Through the design of the double oil passage, the performance of the brake valve in different working states is optimized, and the control safety and comfort of the vehicle under various driving conditions are ensured.

[0030] Further, the part of the valve sleeve 11 close to the first valve sleeve oil passage 16 and the second valve sleeve oil passage 17 is concave, forming corresponding first annular part 18 and second annular part 19, and the first annular part 18 and the second annular part 19 form annular cavities 20 with the inner wall of the electromagnetic valve connecting channel 3. Specifically, in this embodiment, the part of the valve sleeve 11 close to the first valve sleeve oil passage 16 and the second valve sleeve oil passage 17 is designed to be concave, forming the first annular part 18 and the second annular part 19, and the annular cavities 20 are formed between these annular parts and the inner wall of the electromagnetic valve connecting channel 3. In this embodiment, the size and shape of the annular cavities 20 are precisely designed to ensure that the flow of oil is smooth and meets the control function in the energized and non-energized states of the valve core control end 7.

[0031] Further, a damping screw plug 21 is arranged in the brake oil passage 6, the damping screw plug 21 is detachably arranged in the brake oil passage 6, and a damping hole 22 communicating with the inside of the brake oil passage 6 is formed on the damping screw plug 21. Specifically, in this embodiment, the damping screw plug 21 is threadedly connected with the inner wall of the brake oil passage 6, so that the damping screw plug 21 can be tightly fixed in the brake oil passage 6. The size and shape of the damping hole 22 can be designed according to actual needs to achieve the expected damping effect. During braking, the damping screw plug 21 can effectively control the flow speed of the brake oil, thereby ensuring the stability and response speed of the brake system. In addition, the detachable design of the damping screw plug 21 facilitates maintenance and replacement, improving the maintainability of the brake system.

[0032] Further, the valve body 1 is further provided with a one-way valve mounting channel 23, a one-way valve assembly 24 is arranged in the one-way valve mounting channel 23, and the lower ends of the first oil passage part 9 are respectively communicated with the one-way valve mounting channel 23 and the electromagnetic valve connecting channel 3. Specifically, in the embodiment, the one-way valve assembly 24 is arranged to effectively prevent the backflow of the hydraulic oil in the hydraulic system, ensure the one-way flow of the hydraulic oil, realize the control and braking functions, and improve the stability and reliability of the system. The one-way valve assembly 24 is composed of a one-way valve body 25 and a spring, when the hydraulic oil flows from the electromagnetic valve connecting channel 3 to the first oil passage part 9, the one-way valve is opened to allow the oil to pass through, and when it is necessary to prevent the backflow of the oil, the one-way valve is closed under the action of the spring to ensure that the oil does not backflow. This design not only simplifies the structure of the hydraulic system, but also improves the response speed and control accuracy of the system.

[0033] Further, the one-way valve assembly 24 includes a one-way valve body 25 and a connecting spring 26, the one-way valve mounting channel 23 has a tapered surface part 27, the one-way valve body 25 has a tapered end 28 abutting the tapered surface part 27, and the two ends of the connecting spring 26 abut the inner wall of the one-way valve mounting channel 23 and the side end face of the one-way valve body 25 away from the tapered end 28, respectively. Specifically, in the embodiment, the tapered end 28 of the one-way valve assembly 24 is tightly abutted with the tapered surface part 27 to ensure the sealing performance of the one-way valve during operation. When the oil flows from the one-way valve mounting channel 23 to the electromagnetic valve connecting channel 3, the one-way valve body 25 is opened under the action of the oil pressure to overcome the elastic force of the connecting spring 26 to allow the oil to pass through, and when the oil attempts to flow in the reverse direction, the elastic force of the connecting spring 26 makes the one-way valve body 25 tightly abut the tapered surface part 27 to prevent the backflow of the oil, thereby ensuring the one-way flow characteristics of the hydraulic system. In addition, the one-way valve assembly 24 has a simple structure design, is easy to manufacture and maintain, and ensures the stability and reliability of the hydraulic system.

[0034] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plate brake valve with active unloading of the oil circuit at power off and adjustable damping, characterized in that: The valve body and the electromagnetic valve are included, the electromagnetic valve connecting channel is formed in the valve body, the main oil passage, the auxiliary oil passage and the brake oil passage are communicated with the electromagnetic valve connecting channel, the electromagnetic valve has the spool control end, the spool control end extends into the electromagnetic valve connecting channel and controls the on-off of the main oil passage, the auxiliary oil passage and the brake oil passage.

2. The control oil passage de-energizing active unloading and damping adjustable plate brake valve according to claim 1, characterized in that: The connecting oil passage is arranged between the brake oil passage and the electromagnetic valve connecting channel, the connecting oil passage has the first oil passage part and the annular oil passage part, the first oil passage part is arranged through the electromagnetic valve connecting channel, the transition oil passage part is arranged between the annular oil passage part and the brake oil passage, and the annular oil passage part is respectively communicated with the first oil passage part and the brake oil passage.

3. The control oil path de-energized active unloading and damping adjustable plate brake valve according to claim 1, characterized in that: The valve sleeve is arranged on the spool control end, the spool control end has the oil passage part and the body part, the oil passage gap is formed between the oil passage part and the body part, and the valve sleeve oil passage hole is arranged on the valve sleeve and communicated with the electromagnetic valve connecting channel and the inside of the valve sleeve.

4. The control oil path de-energized active unloading and damping adjustable plate brake valve according to claim 3, characterized in that: The valve sleeve oil passage hole includes the first valve sleeve oil passage hole and the second valve sleeve oil passage hole, the spool control end has the power-on state and the power-off state, the first valve sleeve oil passage hole is communicated with the electromagnetic valve connecting channel in the power-off state of the spool control end, and the second valve sleeve oil passage hole is in the sealed state; the spool control end is moved in the power-on state of the spool control end, and the oil passage gap on the spool control end communicates the first valve sleeve oil passage hole and the second valve sleeve oil passage hole.

5. The control oil path de-energized active unloading and damping adjustable plate brake valve according to claim 4, characterized in that: The first annular part and the second annular part are respectively formed in the recessed part of the valve sleeve close to the first valve sleeve oil passage hole and the second valve sleeve oil passage hole, and the first annular part and the second annular part are respectively communicated with the inner wall of the electromagnetic valve connecting channel.

6. The control oil path de-energized active unloading and damping adjustable plate brake valve of claim 1, wherein: The damping screw plug is arranged in the brake oil passage, the damping screw plug is detachably arranged in the brake oil passage, and the damping hole communicated with the inside of the brake oil passage is arranged on the damping screw plug.

7. The control oil path de-energized active unloading and damping adjustable plate brake valve according to claim 2, characterized in that: The one-way valve mounting channel is further arranged on the valve body, the one-way valve assembly is arranged in the one-way valve mounting channel, and the lower part of the first oil passage part is respectively communicated with the one-way valve mounting channel and the electromagnetic valve connecting channel.

8. The control oil path de-energized active unloading and damping adjustable plate brake valve according to claim 7, characterized in that: The one-way valve assembly includes the one-way valve body and the connecting spring, the one-way valve mounting channel has the conical surface part, the one-way valve body has the conical end abutting the conical surface part, and the two ends of the connecting spring are respectively abutted against the inner wall of the one-way valve mounting channel and the side end face of the one-way valve body away from the conical end.

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