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 invention relates to the technical field of brake valves, and in particular to a plate-type brake valve capable of actively unloading by controlling oil circuit power failure and adjustable damping. Background Art

[0002] Most of the existing closed-type plunger pumps with the same-side oil port and unloading return-to-center start switch can only use a control valve with a mechanical handle, which is installed on the plunger pump housing component, and can only unload the control oil that has acted on the main control valve, so that the plunger pump cradle (swash plate) returns to the center position and achieves zero displacement output. However, because the unloading oil circuit of the original zero-position start switch is not set in the main control oil circuit, it can only achieve passive unloading, and cannot completely cut off the control oil circuit to prevent the control oil from entering the variable cylinder, so it is easy to cause unloading, untimely braking, or even unloading and braking. Dangerous situations. Summary of the invention

[0003] In view of this, the present invention provides a plate-type brake valve which can actively unload when the oil circuit is powered off and has adjustable damping.

[0004] To achieve the above object, the present invention provides the following technical solutions: A plate-type brake valve with adjustable damping and active unloading when the oil circuit is powered off, comprises a valve body and a solenoid valve, wherein a solenoid valve connecting channel and a main oil channel, an auxiliary oil channel and a brake oil channel connected to the solenoid valve connecting channel are formed in the valve body, and the solenoid valve has a valve core control end, and the valve core control end extends into the solenoid valve connecting channel to control the on-off of the main oil channel, the auxiliary oil channel and the brake oil channel.

[0005] Preferably, a connecting oil channel is arranged between the brake oil channel and the solenoid valve connecting channel, and the connecting oil channel has a first oil channel portion and an annular oil channel portion, the first oil channel portion is arranged through the solenoid valve connecting channel, and the annular oil channel portion is respectively connected to the first oil channel portion and the brake oil channel.

[0006] Preferably, a valve sleeve is provided on the valve core control end, and the valve core control end has an oil passing portion and a main body portion, an oil passing gap is formed between the oil passing portion and the main body portion, and a valve sleeve oil passing hole connecting the electromagnetic valve connection channel and the inside of the valve sleeve is provided on the valve sleeve.

[0007] Preferably, the valve sleeve oil hole includes a first valve sleeve oil hole and a second valve sleeve oil hole, and the valve core control end has a powered state and a non-powered state. When the valve core control end is in the non-powered state, the first valve sleeve oil hole is connected to the solenoid valve connecting channel, and the second valve sleeve oil hole is in a sealed state; when the valve core control end is in the powered state, the valve core control end is moved, and the oil passing gap on the valve core control end connects the first valve sleeve oil hole and the second valve sleeve oil hole.

[0008] Preferably, the valve sleeve is partially concave near the first valve sleeve oil hole and the second valve sleeve oil hole to form corresponding first and second annular portions, respectively, and annular cavities are formed between the first and second annular portions and the inner wall of the solenoid valve connecting channel.

[0009] Preferably, a damping screw plug is arranged in the brake oil channel, the damping screw plug is detachably arranged in the brake oil channel, and a damping hole communicating with the inside of the brake oil channel is opened on the damping screw plug.

[0010] Preferably, a one-way valve installation channel is further provided on the valve body, a one-way valve assembly is arranged in the one-way valve installation channel, and two ends of the lower part of the first oil channel portion are respectively connected to the one-way valve installation channel and the solenoid valve connection channel.

[0011] Preferably, the one-way valve assembly includes a one-way valve body and a connecting spring, the one-way valve mounting channel has a conical surface portion, the one-way valve body has a conical end that fits the conical surface portion, and the two ends of the connecting spring respectively press against the inner wall of the one-way valve mounting channel and the end surface of the one-way valve body away from the conical end.

[0012] The beneficial effect of the present invention is that the solenoid valve is a two-position three-way solenoid valve, one end of which is connected to the control power supply, and the other end is connected to the solenoid valve connection channel in the valve body. When the solenoid valve is not energized, that is, when the solenoid valve is powered off, the main oil channel is cut off, and the main control oil cannot enter. At the same time, the pressure of the oil in the brake oil channel will open the one-way valve to connect with the auxiliary oil channel, so as to achieve control oil blocking and brake oil channel unloading. When the solenoid valve is energized, the valve core control end moves to the open position, the brake oil channel is connected to the main oil channel, the control oil circuit is connected, the main control oil passes through the main oil channel, enters the brake oil channel, and enters the control piston chamber of the pump or motor from the brake oil channel, so as to start working. In addition, the present design also includes a damping adjustment mechanism, by adjusting the damping size, the flow resistance of the oil in the brake oil channel can be changed, so as to achieve fine control of the speed of the main control oil entering the pump or motor control piston chamber. This design realizes the adjustable use of different control speeds according to different host system configuration requirements, and also enhances the stability and safety of the system control process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2It is a cross-sectional view of the present invention; Attached Figure 3 It is a cross-sectional view of the valve body; Attached Figure 4 Schematic diagram of the valve body. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] The present invention provides the following technical solutions: As attached Figure 1-4 As shown, the present invention discloses a plate-type brake valve with adjustable damping and active unloading when the control oil circuit is powered off, comprising a valve body 1 and a solenoid valve 2, wherein a solenoid valve connecting channel 3 and a main oil channel 4, an auxiliary oil channel 5 and a brake oil channel 6 connected to the solenoid valve connecting channel 3 are formed in the valve body 1, and the solenoid valve 2 has a valve core control end 7, and the valve core control end 7 extends into the solenoid valve connecting channel 3 to control the on-off of the main oil channel 4, the auxiliary oil channel 5 and the brake oil channel 6. Specifically, in the present design, the solenoid valve 2 is a two-position three-way solenoid valve 2, one end of which is connected to the control power supply, and the other end is connected to the solenoid valve connecting channel 3 in the valve body 1. When the solenoid valve 2 is not powered on, the valve core control end 7 is in a closed position, the main oil channel 4 is cut off, and the main control oil cannot enter. At the same time, the pressure of the oil in the brake oil channel 6 will open the one-way valve to connect with the auxiliary oil channel 5, so as to achieve control oil blocking and unloading of the brake oil channel 6, thereby achieving active unloading of the controlled pump or motor. When the solenoid valve 2 is energized, the valve core control end 7 moves to the open position, the brake oil channel 6 is connected to the main oil channel 4, the control oil circuit is connected, and the main control oil passes through the main oil channel 4 and enters the brake oil channel 6, and then enters the control piston chamber of the pump or motor from the brake oil channel 6, thereby starting to work. In addition, the present design also includes a damping adjustment mechanism, which can change the flow resistance of the oil in the brake oil channel 6 by adjusting the damping size, thereby achieving fine control of the braking effect. This design realizes the adjustable use of different control speeds according to different host system configuration requirements, and also enhances the stability and safety of the system control process.

[0018] The design works as follows: The control oil enters and exits the plunger pump or plunger motor through the main oil channel 4, the auxiliary oil channel 5 and the brake oil channel 6 on the valve body 1. After the control oil enters the valve body 1 from the main oil channel 4, the oil enters the annular cavity 20 formed between the solenoid valve connecting channel 3 and the valve sleeve 11 through the first oil hole. When the solenoid valve 2 is not energized, the second valve sleeve oil hole 17 on the valve sleeve 11 is covered by the valve core control end 7, and the oil gap 14 formed between the oil passage portion 12 and the main body portion 13 on the valve core control end 7 connects the solenoid valve connecting channel 3 and the first valve sleeve oil hole 16. At this time, the control oil of the plunger pump and the motor can only enter the annular cavity 20 and cannot reach other oil ports through the brake valve, that is, the control oil circuit is in a cut-off state.

[0019] When solenoid valve 2 is energized, Figure 2 As shown, the valve core control end 7 moves from the valve body 1 end to the solenoid end under the action of the electromagnet. At this time, the valve core control end 7 separates the solenoid valve connection channel 3 and the first valve sleeve oil hole 16, and the oil gap 14 of the valve core control end 7 connects the second valve sleeve oil hole 17 and the first valve sleeve oil hole 16. The control oil of the plunger pump and the motor will enter the annular cavity 20 from the main oil passage 4, and then enter the first valve sleeve oil hole 16 of the valve sleeve 11 through the second valve sleeve oil hole 17 on the valve sleeve 11 and the oil gap 14 of the valve core control end 7. At this time, the control oil can enter the upper part of the first oil passage part 9, and then enter the transition oil passage part 29 through the annular oil passage part 10. The two ends of the transition oil passage part 29 are connected to the annular oil passage part 10 and the brake oil passage 6 respectively, and then enter the damping hole 22 of the damping screw 21 through the brake oil passage 6, so as to be output through the oil passage port of the brake oil passage 6 and enter the main control oil circuit of the plunger pump or the plunger motor. During this process, the pressure at the tapered end 28 of the one-way valve body 25 is lower than the pressure at the tail end, so the one-way valve assembly 24 is always in a closed state.

[0020] When the vehicle or equipment system is in operation and braking is required due to operational requirements or unexpected situations, the electric signal of the electromagnet only needs to be disconnected, and the valve core control end 7 will return to the state where the second valve sleeve oil hole 17 is covered by the valve core control end 7. At this time, due to the structural reasons 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, since there is no pressure control oil input at the tail end of the one-way valve assembly 24 and the damping screw plug 21, the pressure of the conical surface 27 of the one-way valve installation channel 23 is greater than the pressure of the tail end oil channel, so the one-way valve body 25 moves in the direction in which the connecting spring 26 is compressed, so that the one-way valve installation channel 23 is opened. The unloaded oil enters the conical surface 27 of the one-way valve installation channel 23 from the oil channel hole brake oil channel 6, and 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 9, then enter the first valve sleeve oil hole 16 of the valve sleeve 11, enter the solenoid valve connecting channel 3 through the oil gap 14 of the valve core control end 7, and then discharge the brake valve body 1 through the auxiliary oil channel 5. This realizes the function of cutting off the main control oil circuit when the brake valve is powered off and unloading the pump motor.

[0021] Furthermore, a connecting oil channel 8 is arranged between the brake oil channel 6 and the solenoid valve connecting channel 3, and the connecting oil channel 8 has a first oil channel portion 9 and an annular oil channel portion 10. The first oil channel portion 9 is arranged through the solenoid valve connecting channel 3, and the annular oil channel portion 10 is respectively connected to the first oil channel portion 9 and the brake oil channel 6.

[0022] Furthermore, a valve sleeve 11 is sleeved on the valve core control end 7, and the valve core control end 7 has an oil passage portion 12 and a body portion 13, an oil passage gap 14 is formed between the oil passage portion 12 and the body portion 13, and a valve sleeve oil passage hole 15 is provided on the valve sleeve 11 to connect the electromagnetic valve connection channel 3 and the inside of the valve sleeve 11. Specifically, in this embodiment, the diameter of the valve sleeve oil passage hole 15 is smaller than the diameter of the oil passage portion 12, so that the design can ensure that during the braking process, when the oil passes through the valve sleeve oil passage hole 15, a certain throttling effect is generated, thereby further improving the sensitivity and response speed of the brake. At the same time, the size of the valve sleeve oil passage hole 15 can be adjusted according to actual use requirements to achieve the best braking effect. In addition, a sealing ring is provided between the body portion 13 of the valve core control end 7 and the valve body 1, which ensures the sealing of the brake oil channel 6, prevents oil leakage, and ensures the safe and reliable operation of the brake system. Through this structural design, the performance of the brake valve is significantly improved, providing a more stable and reliable braking guarantee for the vehicle.

[0023] Further, the valve sleeve oil hole 15 includes a first valve sleeve oil hole 16 and a second valve sleeve oil hole 17, and the valve core control end 7 has an energized state and a non-energized state. When the valve core control end 7 is in the non-energized state, the first valve sleeve oil hole 16 is connected to the electromagnetic valve connection channel 3, and the second valve sleeve oil hole 17 is in a sealed state; when the valve core control end 7 is in the energized state, the valve core control end 7 is moved, and the oil gap 14 on the valve core control end 7 connects the first valve sleeve oil hole 16 and the second valve sleeve oil hole 17. Specifically, in this embodiment, when the valve core control end 7 is in the energized state, the valve core control end 7 is moved, so that the first valve sleeve oil hole 16 and the second valve sleeve oil hole 17 are connected to the oil gap 14 at the same time, so that the flow area of ​​the oil can be increased, the system pressure can be reduced, and a smooth control oil distribution process can be achieved. Through the design of this double oil hole, the performance of the brake valve in different working states is optimized, ensuring the control safety and comfort of the vehicle under various driving conditions.

[0024] Furthermore, the valve sleeve 11 is partially concave near the first valve sleeve oil hole 16 and the second valve sleeve oil hole 17 to form the corresponding first annular portion 18 and second annular portion 19, respectively, and an annular cavity 20 is formed between the first annular portion 18 and the second annular portion 19 and the inner wall of the electromagnetic valve connecting channel 3. Specifically, in the present embodiment, the valve sleeve 11 portion near the first valve sleeve oil hole 16 and the second valve sleeve oil hole 17 is designed to be concave, forming the first annular portion 18 and the second annular portion 19, and an annular cavity 20 is formed between these annular portions and the inner wall of the electromagnetic valve connecting channel 3. In the present embodiment, the size and shape of the annular cavity 20 are precisely designed to ensure that the flow of oil is smooth and meets the control function when the valve core control end 7 is powered or not powered.

[0025] Furthermore, a damping screw plug 21 is arranged in the brake oil channel 6, and the damping screw plug 21 is detachably arranged in the brake oil channel 6, and a damping hole 22 connected to the inside of the brake oil channel 6 is opened on the damping screw plug 21. Specifically, in the present embodiment, the damping screw plug 21 is threadedly connected to the inner wall of the brake oil channel 6, so that the damping screw plug 21 can be tightly fixed in the brake oil channel 6. The size and shape of the damping hole 22 can be designed according to actual needs to achieve the expected damping effect. During the braking process, the damping screw plug 21 can effectively control the flow speed of the brake oil, thereby ensuring the stability and response speed of the braking system. In addition, the detachable design of the damping screw plug 21 facilitates maintenance and replacement, thereby improving the maintainability of the braking system.

[0026] Furthermore, a one-way valve installation channel 23 is also provided on the valve body 1, and a one-way valve assembly 24 is arranged in the one-way valve installation channel 23, and the two ends of the lower part of the first oil channel portion 9 are connected to the one-way valve installation channel 23 and the solenoid valve connection channel 3 respectively. Specifically, in this embodiment, by providing the one-way valve assembly 24, the oil in the hydraulic system can be effectively prevented from flowing back, and the one-way flow of the hydraulic oil can be ensured, thereby realizing the control and braking functions and improving 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 and other components. When the hydraulic oil flows from the solenoid valve connection channel 3 to the first oil channel portion 9, the one-way valve opens to allow the oil to pass through; and when it is necessary to prevent the oil from flowing back, the one-way valve is closed under the action of the spring to ensure that the oil does not flow back. This design not only simplifies the structure of the hydraulic system, but also improves the response speed and control accuracy of the system.

[0027] Further, the one-way valve assembly 24 includes a one-way valve body 25 and a connecting spring 26, the one-way valve installation channel 23 has a conical surface 27, the one-way valve body 25 has a conical end 28 that fits the conical surface 27, and the two ends of the connecting spring 26 respectively abut against the inner wall of the one-way valve installation channel 23 and the end surface of the one-way valve body 25 away from the conical end 28. Specifically, in this embodiment, the conical end 28 of the one-way valve assembly 24 fits tightly with the conical surface 27, ensuring the sealing of the one-way valve when working. When the oil flows from the one-way valve installation channel 23 to the solenoid valve connection channel 3, the one-way valve body 25 overcomes the elastic force of the connecting spring 26 under the action of the oil pressure and opens to allow the oil to pass; and when the oil tries to flow in the reverse direction, the elastic force of the connecting spring 26 makes the one-way valve body 25 fit tightly with the conical surface 27, thereby preventing the oil from flowing in the reverse direction, ensuring the one-way flow characteristics of the hydraulic system. In addition, the one-way valve assembly 24 has a simple structural design, is easy to manufacture and maintain, and ensures the stability and reliability of the hydraulic system.

[0028] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping, characterized in that: It includes a valve body and a solenoid valve, wherein a solenoid valve connecting channel and a main oil channel, an auxiliary oil channel and a brake oil channel connected to the solenoid valve connecting channel are formed in the valve body, and the solenoid valve has a valve core control end, and the valve core control end extends into the solenoid valve connecting channel to control the on-off of the main oil channel, the auxiliary oil channel and the brake oil channel.

2. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 1 is characterized in that: A connecting oil channel is arranged between the brake oil channel and the solenoid valve connecting channel, and the connecting oil channel has a first oil channel portion and an annular oil channel portion. The first oil channel portion is arranged through the solenoid valve connecting channel, and a transition oil channel portion is arranged between the annular oil channel portion and the brake oil channel. The annular oil channel portion is respectively connected to the first oil channel portion and the brake oil channel.

3. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 1 is characterized in that: A valve sleeve is sleeved on the valve core control end, and the valve core control end has an oil passing part and a main body part, an oil passing gap is formed between the oil passing part and the main body part, and a valve sleeve oil passing hole connecting the electromagnetic valve connection channel and the inside of the valve sleeve is provided on the valve sleeve.

4. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 3 is characterized in that: The valve sleeve oil hole comprises a first valve sleeve oil hole and a second valve sleeve oil hole, and the valve core control end has an energized state and a non-energized state. When the valve core control end is in the non-energized state, the first valve sleeve oil hole is connected to the electromagnetic valve connection channel, and the second valve sleeve oil hole is in a sealed state; when the valve core control end is in the energized state, the valve core control end is moved, and the oil gap on the valve core control end connects the first valve sleeve oil hole and the second valve sleeve oil hole.

5. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 4 is characterized in that: The valve sleeve is partially concave near the first valve sleeve oil hole and the second valve sleeve oil hole to form corresponding first and second annular parts respectively, and corresponding annular cavities are formed between the first and second annular parts and the inner wall of the electromagnetic valve connecting channel.

6. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 1 is characterized in that: A damping screw plug is arranged in the brake oil passage, and the damping screw plug is detachably arranged in the brake oil passage. A damping hole communicating with the inside of the brake oil passage is formed on the damping screw plug.

7. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 2 is characterized in that: The valve body is also provided with a one-way valve installation channel, in which a one-way valve assembly is arranged, and two ends of the lower part of the first oil channel portion are respectively connected with the one-way valve installation channel and the solenoid valve connection channel.

8. The plate-type brake valve with active unloading when the oil circuit is powered off and adjustable damping according to claim 7 is characterized in that: The one-way valve assembly includes a one-way valve body and a connecting spring. The one-way valve installation channel has a conical surface portion, and the one-way valve body has a conical end that fits the conical surface portion. The two ends of the connecting spring respectively press against the inner wall of the one-way valve installation channel and the end surface of the one-way valve body away from the conical end.

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