Manual pneumatic control proportional valve

Abstract

The utility model relates to the technical field of pneumatic control valves, and discloses a manual pneumatic control proportional valve which comprises a valve body and a valve cover, an air inlet is formed in the bottom end of the valve body, a handle is connected to the valve cover in an inserted mode, a connecting cam is arranged at the lower end of the handle in a sleeved mode, and a lifting unit and a descending unit which are correspondingly matched with the two sides of the connecting cam are arranged in the valve body. A power takeoff switch is arranged at the top end of the valve cover, the connecting cam and the power takeoff switch are rotationally installed on the valve cover through cylindrical pins, a first lifting cavity correspondingly matched with the power takeoff switch is formed in the valve body, a lifting valve element and a sealing plug are arranged in the first lifting cavity, and the lower end of the lifting valve element is sleeved with a lifting spring; a PTO working opening is formed in the bottom end of the valve body, and the first lifting cavity communicates with the air inlet and the PTO working opening. According to the utility model, the power takeoff switch is matched with the lifting valve core and the sealing plug, so that the stable operation in the PTO connection and separation process is realized, and the torque is stably transmitted.

Description

Technical Field

[0001] The utility model relates to the technical field of air-controlled valves, in particular to a manual air-controlled proportional valve. Background Art

[0002] Power Take-off (PTO) is a power output device that outputs part or all of the vehicle engine power to an external working device in the form of rotational mechanical energy. The traditional PTO engagement control method is to directly engage through a dry clutch or a switch valve, which will generate a huge impact force during the PTO starting process, causing damage to the PTO and external working devices. Utility Model Content

[0003] The purpose of the utility model is to provide a manual pneumatic proportional valve to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a manual air-controlled proportional valve, comprising a valve body and a valve cover, an air inlet is provided at the bottom end of the valve body, a handle is inserted on the valve cover, a connecting cam is sleeved at the lower end of the handle, a lifting unit and a lowering unit corresponding to the two sides of the connecting cam are provided inside the valve body, a power take-off switch is provided on the top of the valve cover, the connecting cam and the power take-off switch are both rotatably mounted on the valve cover by a cylindrical pin, a first lifting chamber corresponding to the power take-off switch is provided inside the valve body, a lifting valve core and a sealing plug are provided in the first lifting chamber, a lifting spring is sleeved at the lower end of the lifting valve core, a PTO working port is provided at the bottom end of the valve body, and the first lifting chamber is respectively connected to the air inlet and the PTO working port.

[0005] The following improvements are made in the present application: the lifting unit includes a second lifting chamber, a lifting valve core and a sealing plug are also provided in the second lifting chamber, a lifting spring is sleeved on the lower end of the lifting valve core, a lifting working port is provided at the bottom end of the valve body, and the second lifting chamber is connected to the air inlet and the lifting working port respectively. In the initial state, the handle is located in the middle position of the jack, and the handle is moved to one side of the second lifting chamber, driving the connection cam to rotate and press down the lifting valve core, thereby driving the sealing plug downward, opening the valve port, allowing the air source to enter the second lifting chamber, and then form a connection with the external lifting system through the lifting working port to drive the movement of the component.

[0006] The following improvements are made in the present application: the descending unit includes a descending chamber, a descending valve core pressure head and a descending valve core are provided in the descending chamber, a sealing plug is provided below the descending valve core, and a descending spring is sleeved on the lower end of the descending valve core, a descending working port is provided at the bottom end of the valve body, and the descending chamber is connected to the air inlet and the descending working port respectively. The handle is moved to one side of the descending chamber, driving the connecting cam to rotate and press down the descending valve core pressure head and the descending valve core, thereby driving the sealing plug downward, opening the valve port, allowing the air source to enter the descending chamber, and then connect with the external descending system through the descending working port to work. With different descending angles, the output air pressure is also different, thereby realizing the proportional control function.

[0007] The following improvements are made in the present application: an insert is provided on the side of the power take-off switch close to the connection cam, and a notch is provided on the side of the connection cam close to the descending cavity to match the insert. In the initial state, the handle is located in the middle of the jack. When the power take-off switch moves to the on position, the insert moves into the notch along with the power take-off switch and forms a connection with the connection cam. In this state, the connection cam can be adjusted in the lifting direction, and the power take-off switch will be automatically closed when adjusted in the descending direction.

[0008] The following improvements are made in the present application: the handle is provided with a telescopic part, the valve cover is provided with a socket that matches the rotation trajectory of the handle, and a card slot is provided in the middle of the socket and on the inner wall of one side close to the descending unit, and the card slot matches the telescopic part. In the initial state, the handle is locked in the socket by the telescopic part and the card slot that conflict with each other. When in use, the handle is first lifted up to pull the telescopic part apart, and the lock between the telescopic part and the card slot is released, so that the handle can move in the socket; when the handle is in the descending position, the telescopic part is retracted and locked in the card slot.

[0009] The following improvements are made in the present application: a return spring is provided on the outer sleeve of the plug, a through hole is provided on the inner wall of one side below the plug in the first lifting chamber and the second lifting chamber, and a steel ball is provided in the through hole.

[0010] The following improvement is made in the solution of the present application: an indicator light is embedded on the valve cover at one side of the power take-off switch, and the indicator light is connected to the power take-off switch and is controlled by the power take-off switch.

[0011] Compared with the prior art, the utility model provides a manual pneumatic proportional valve, which has the following beneficial effects:

[0012] The utility model realizes the soft start of the PTO engagement process by arranging a power take-off switch on the proportional valve, cooperating with the lifting valve core and the sealing plug. The initial position of the power take-off switch is 45° with the horizontal plane. The power take-off switch is rotated to the other end, and the lifting valve core is driven by the power take-off switch to be pressed downward, thereby driving the sealing plug downward, opening the valve port, allowing the gas in the air inlet to enter the first lifting chamber, and then sending a signal through the PTO working port, slowly increasing the circuit pressure, and controlling the rate of increase of the PTO speed within a certain range, thereby realizing smooth operation of the PTO engagement and separation process and stably transmitting torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the utility model;

[0014] Figure 2 It is the bottom schematic diagram of the valve body;

[0015] Figure 3 It is a right side view of the utility model;

[0016] Figure 4 for Figure 3 Middle AA section;

[0017] Figure 5 for Figure 3 Middle BB section;

[0018] Figure 6 for Figure 3 Middle CC section;

[0019] Figure 7 Schematic diagram of the connection between the insert and the notch.

[0020] In the figure: 1. valve body; 11. air inlet; 12. PTO working port; 13. lifting working port; 14. lowering working port; 2. valve cover; 21. handle; 211. telescopic part; 22. connecting cam; 221. notch; 23. power take-off switch; 24. jack; 25. slot; 26. insert; 3. first lifting chamber; 31. lifting valve core; 32. plug; 33. lifting spring; 34. return spring; 35. through hole; 36. steel ball; 4. second lifting chamber; 5. lowering chamber; 51. lowering valve core pressure head; 52. lowering valve core; 53. lowering spring; 6. indicator light. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiment of the present invention will be described below in conjunction with the accompanying drawings in the embodiment of the present invention:

[0022] like Figure 1-3As shown, a manual pneumatic proportional valve is mainly composed of a valve body 1 and a valve cover 2, wherein the bottom end of the valve body 1 is provided with an air inlet 11, a PTO working port 12, a lifting working port 13 and a lowering working port 14, a handle 21 is plugged into the valve cover 2, a connecting cam 22 is sleeved on the lower end of the handle 21, a power take-off switch 23 is provided on the top of the valve cover 2, and the connecting cam 22 and the power take-off switch 23 are both rotatably mounted inside the valve cover 2 through a cylindrical pin, and a telescopic portion 211 is provided on the handle 21, and the telescopic portion 211 adopts a telescopic tube, the innermost tube body of which is connected to the handle 21 below, and the outermost tube body is connected to the handle 21 above. The valve cover 2 is provided with a socket 24 that matches the rotation trajectory of the handle 21, and a slot 25 is provided in the middle of the socket 24 and on the inner wall on one side close to the descending unit. The slot 25 matches the telescopic part 211; at the same time, an indicator light 6 is embedded on the valve cover 2 on one side of the power take-off switch 23, and the indicator light 6 is connected to the power take-off switch 23 and is controlled by the power take-off switch 23.

[0023] like Figure 4-6 The valve body 1 is provided with a lifting unit and a descending unit corresponding to the left and right sides of the connecting cam 22, and the valve body 1 is provided with a first lifting chamber 3 corresponding to the power take-off switch 23, the lifting unit includes a second lifting chamber 4, and the descending unit includes a descending chamber 5. The first lifting chamber 3 and the second lifting chamber 4 are both provided with a lifting valve core 31 and a sealing plug 32, and the lower end of the lifting valve core 31 is sleeved with a lifting spring 33, the outer side of the sealing plug 32 is sleeved with a reset spring 34, and the descending chamber 5 is provided with a descending valve core pressure head 51 and a descending valve core 52, a sealing plug 32 is provided below the descending valve core 52, and a descending spring 53 is sleeved on the lower end of the descending valve core 52, the first lifting chamber 3 is communicated with the air inlet 11 and the PTO working port 12 respectively, the second lifting chamber 4 is communicated with the air inlet 11 and the lifting working port 13 respectively, and the descending chamber 5 is communicated with the air inlet 11 and the descending working port 14 respectively; a through hole 35 is opened on the inner wall of one side below the sealing plug 32 in the first lifting chamber 3 and the second lifting chamber 4, and a steel ball 36 is arranged in the through hole 35.

[0024] To limit the working position of the handle 21 when the power take-off switch 23 is turned on, Figure 7 As shown, an insert 26 is provided on the side of the power take-off switch 23 close to the connection cam 22, and a notch 221 matching with the insert 26 is provided on the side of the connection cam 22 close to the descending chamber 5. In the initial state, the handle 21 is located in the middle of the insertion hole 24. When the power take-off switch 23 moves to the working position, the insert 26 moves into the notch 221 along with the power take-off switch 23 and forms a connection with the connection cam 22. In this state, the connection cam 22 can be adjusted in the lifting direction, and when adjusted in the descending direction, it will drive the power take-off switch 23 to rotate to the initial closed position.

[0025] Working principle: In the initial state, the handle 21 is located in the middle position of the plug 24. The handle 21 is moved toward the left second lifting chamber 4, driving the connecting cam 22 to rotate and press down the lifting valve core 31, thereby driving the plug 32 downward, opening the valve port, allowing the air source to enter the second lifting chamber 4, and then through the lifting working port 13 to form a connection with the external lifting system to promote the movement of the component; the handle 21 is moved toward the right descending chamber 5, driving the connecting cam 22 to rotate and press down the descending valve core pressure head 51 and the descending valve core 52, thereby driving the plug 32 downward, opening the valve port, allowing the air source to enter the descending chamber 5, and then through the descending working port 14 to form a connection with the external descending system to work; the initial position of the power take-off switch 23 is 45° with the horizontal plane, and the power take-off switch 23 is rotated to the other end to the working position, and the power take-off switch 23 drives the lifting valve core 31 to press downward, thereby driving the plug 32 downward, opening the valve port, allowing the gas in the air inlet 11 to enter the first lifting chamber 3, and then through the PTO working port 12 to send a signal.

[0026] The above embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A manual pneumatic proportional valve, comprising a valve body (1) and a valve cover (2), wherein the bottom end of the valve body (1) is provided with an air inlet (11), and the valve cover (2) is plugged with a handle (21), characterized in that: The lower end of the handle (21) is sleeved with a connecting cam (22); the valve body (1) is provided with a lifting unit and a lowering unit corresponding to the two sides of the connecting cam (22); the top of the valve cover (2) is provided with a power take-off switch (23); the connecting cam (22) and the power take-off switch (23) are both rotatably mounted on the valve cover (2) through a cylindrical pin; the valve body (1) is provided with a first lifting chamber (3) corresponding to the power take-off switch (23); the first lifting chamber (3) is provided with a lifting valve core (31) and a sealing plug (32); the lower end of the lifting valve core (31) is sleeved with a lifting spring (33); the outer side of the sealing plug (32) is sleeved with a return spring (34); the bottom end of the valve body (1) is provided with a PTO working port (12); the first lifting chamber (3) is communicated with the air inlet (11) and the PTO working port (12) respectively.

2. A manual pneumatic proportional valve according to claim 1, characterized in that: The lifting unit comprises a second lifting chamber (4), a lifting valve core (31) and a sealing plug (32) are also provided in the second lifting chamber (4), a lifting spring (33) is sleeved on the lower end of the lifting valve core (31), a lifting working port (13) is provided at the bottom end of the valve body (1), and the second lifting chamber (4) is respectively connected to the air inlet (11) and the lifting working port (13).

3. A manual pneumatic proportional valve according to claim 2, characterized in that: The descending unit comprises a descending chamber (5), wherein a descending valve core pressure head (51) and a descending valve core (52) are arranged in the descending chamber (5), a sealing plug (32) is arranged below the descending valve core (52), and a descending spring (53) is sleeved on the lower end of the descending valve core (52), a descending working port (14) is arranged at the bottom end of the valve body (1), and the descending chamber (5) is respectively connected to the air inlet (11) and the descending working port (14).

4. A manual pneumatic proportional valve according to claim 3, characterized in that: An insert (26) is provided on one side of the power take-off switch (23) close to the connecting cam (22), and a notch (221) matching the insert (26) is provided on one side of the connecting cam (22) close to the descending chamber (5).

5. A manual pneumatic proportional valve according to claim 1, characterized in that: The handle (21) is provided with a telescopic portion (211), the valve cover (2) is provided with a plug hole (24) that matches the rotation track of the handle (21), and a clamping groove (25) is provided in the middle of the plug hole (24) and on the inner wall of one side close to the descending unit, and the clamping groove (25) matches the telescopic portion (211).

6. A manual pneumatic proportional valve according to claim 2, characterized in that: A through hole (35) is provided on the inner wall of one side of the first lifting chamber (3) and the second lifting chamber (4) located below the sealing plug (32), and a steel ball (36) is provided in the through hole (35).

7. A manual pneumatic proportional valve according to claim 1, characterized in that: An indicator light (6) is embedded on the valve cover (2) at one side of the power take-off switch (23); the indicator light (6) is connected to the power take-off switch (23) and is controlled by the power take-off switch (23).

Images