CN220622707U - Power takeoff protection circuit and engineering machinery - Google Patents
Power takeoff protection circuit and engineering machinery Download PDFInfo
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- CN220622707U CN220622707U CN202322394095.7U CN202322394095U CN220622707U CN 220622707 U CN220622707 U CN 220622707U CN 202322394095 U CN202322394095 U CN 202322394095U CN 220622707 U CN220622707 U CN 220622707U
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Abstract
The utility model discloses a power takeoff protection circuit and engineering machinery. The power takeoff protection circuit comprises a neutral gear detection module, a switching master control module, a power takeoff switch, a switching module, a driving electromagnetic air valve and a pumping electromagnetic air valve; the neutral gear detection module is used for conducting the connection of the first control part and the passage of the power supply when the neutral gear state is detected, so that the first execution part of the switching master control module conducts the connection of the switching module and the first end of the power supply; the switching module is used for switching the connection between the switching master control module and one of the driving electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other one of the driving electromagnetic air valve and the pumping electromagnetic air valve when the power taking switch is closed, and the driving electromagnetic air valve and the pumping electromagnetic air valve are respectively connected with the second end of the power supply. The utility model avoids the damage of gears and shifting forks in the power takeoff of the transfer case caused by the fact that the power shut-off operation such as neutral gear engagement or clutch stepping is not carried out on the gearbox when the power takeoff of the transfer case is subjected to power take-off switching.
Description
Technical Field
The embodiment of the utility model relates to the technical field of constructional engineering machinery, in particular to a power takeoff protection circuit and engineering machinery.
Background
The power take-off is a group of speed change gears, also called power output devices, and vehicles needing additional power such as dumpers, fire trucks, cement stirring vehicles, concrete pump vehicles and the like acquire additional power through the power take-off.
In the prior art, the working condition switching misoperation of driving and pumping operation is easy to occur when the gear is not in neutral gear, so that the gear and the shifting fork in the power takeoff are damaged.
Disclosure of Invention
The utility model provides a power takeoff protection circuit and engineering machinery, which are used for avoiding damage to gears and shifting forks in a power takeoff caused by no neutral gear engaging operation on a gearbox when the power takeoff of a transfer case is subjected to power taking switching.
In a first aspect, an embodiment of the present utility model provides a power takeoff protection circuit, including a neutral gear detection module, a switching master control module, a power takeoff switch, a switching module, a driving electromagnetic air valve and a pumping electromagnetic air valve;
the neutral gear detection module is connected with the first control part of the switching master control module in series at two ends of the power supply, and is used for conducting the connection of the first control part and the passage of the power supply when the neutral gear state is detected, so that the first execution part of the switching master control module conducts the connection of the switching module and the first end of the power supply;
the switching module is respectively and electrically connected with the first executing part, the power taking switch, the driving electromagnetic air valve and the pumping electromagnetic air valve, and is used for switching the connection between the switching master control module and one of the driving electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other one of the driving electromagnetic air valve and the pumping electromagnetic air valve when the power taking switch is closed, and the driving electromagnetic air valve and the pumping electromagnetic air valve are respectively connected with the second end of the power supply.
In a second aspect, an embodiment of the present utility model further provides an engineering machine, including the power takeoff protection circuit provided in the first aspect.
According to the power takeoff protection circuit and the engineering machinery, when the neutral gear detection module detects a neutral gear state, the first control part is conducted to be connected with a passage of a power supply, so that the first execution part of the switching master control module is conducted to be connected with the first end of the power supply; when the power take-off switch is closed, the switching module is used for switching the connection between the switching master control module and one of the running electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other one of the running electromagnetic air valve and the pumping electromagnetic air valve. According to the technical scheme, only when the neutral gear detection module detects the neutral gear state, the switching module can switch the connection paths of the driving electromagnetic air valve and the pumping electromagnetic air valve and the power supply, namely, only when the neutral gear state is achieved, the driving state and the pumping state can be switched, and gear and shifting fork inside the transfer case power takeoff are prevented from being damaged due to the fact that the transfer case power takeoff is not subjected to neutral gear operation when power takeoff is switched.
Drawings
Fig. 1 is a schematic structural diagram of a power takeoff protection circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another power takeoff protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another power takeoff protection circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of another power takeoff protection circuit according to an embodiment of the present utility model;
FIG. 5 is a position block diagram of a travel position detection switch and a pumping position detection switch;
FIG. 6 is a schematic diagram of another power takeoff protection circuit according to an embodiment of the present utility model;
fig. 7 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
Fig. 1 is a schematic structural diagram of a power takeoff protection circuit according to an embodiment of the present utility model. As shown in fig. 1, the power take-off protection circuit includes: neutral detection module 110, switching master control module 120, power take-off switch 130, switching module 140, traveling electromagnetic gas valve 150, and pumping electromagnetic gas valve 160;
the neutral detection module 110 and the first control portion 121 of the switching master control module 120 are connected in series at two ends of the power supply 100, and the neutral detection module 110 is configured to switch on the connection of the first control portion 121 and the path of the power supply 100 when detecting the neutral state, so that the first execution portion 122 of the switching master control module 120 switches on the connection of the switching module 140 and the first end of the power supply 100.
The switching module 140 is electrically connected to the first executing portion 122, the power take-off switch 130, the traveling electromagnetic valve 150, and the pumping electromagnetic valve 160, and is configured to switch connection between the switching master control module 120 and one of the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 to connection between the switching master control module 120 and the other of the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 when the power take-off switch 130 is closed, and the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 are also connected to the second end of the power supply 100, respectively.
The neutral detection module 110 is configured to detect whether the transmission is in neutral, where the neutral detection module 110 may be a detection switch, and may specifically include a neutral detection switch; the switching master control module 120 is a master control module for controlling the power on and off of the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160, and the switching master control module 120 includes a first control part 121 and a first execution part 122.
Specifically, when the vehicle gearbox is in a neutral gear, the neutral gear detection module 110 is turned on, the first control part 121 of the switching master control module 120 is communicated with the power supply 100, the first control part 121 of the switching master control module 120 is powered on, so that the first executing part 122 of the switching master control module 120 is connected to the switching module 140, and the switching module 140 is communicated with the power supply 100; when the vehicle gearbox is in a non-neutral gear, the neutral gear detection module 110 is disconnected, and the first control part 121 of the switching master control module 120 is powered off, so that the first execution part 122 of the switching master control module 120 is in a suspended state.
The power take-off switch 130 is a switch for switching the running and pumping working conditions of the vehicle operated by an operator; the switching module 140 is electrically connected with the traveling electromagnetic valve 150 or the pumping electromagnetic valve 160 according to the state of the power take-off switch 130, so as to switch different working conditions. The traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 are electromagnetic valves that control traveling and pumping operations of the vehicle.
Specifically, when the vehicle gearbox is in neutral gear, the first executing part 122 of the switching master control module 120 is connected to the switching module 140, if the power taking switch 130 is switched from off to on at this time, the switching module 140 is powered on and is connected with the pumping electromagnetic valve 160, the pumping electromagnetic valve 160 is communicated with the power supply 100 through the switching module 140 and the first executing part 122 of the switching master control module 120, the pumping electromagnetic valve 160 is powered on, and the vehicle is switched from running operation to pumping operation; if the power take-off switch 130 is switched from on to off at this time, the switching module 140 is powered off and is connected to the running electromagnetic valve 150, the running electromagnetic valve 150 is connected to the power supply 100 through the switching module 140 and the first executing part 122 of the switching master control module 120, the running electromagnetic valve 150 is powered on, and the vehicle is switched from pumping operation to running operation.
When the vehicle gearbox is in a non-neutral gear, the first control part 121 of the switching master control module 120 is powered off, so that the first execution part 122 of the switching master control module 120 is in a suspended state, if the power take-off switch 130 is switched from off to on at the moment, the switching module 140 is powered on and connected with the pumping electromagnetic air valve 160, but because the first execution part 122 of the switching master control module 120 is in the suspended state, the pumping electromagnetic air valve 160 is powered off, so that the vehicle cannot be switched from running operation to pumping operation; similarly, if the power take-off switch 130 is switched from on to off at this time, the switching module 140 is powered off and is connected to the running electromagnetic valve 150, but the first executing portion 122 of the switching master control module 120 is in a suspended state, so that the running electromagnetic valve 150 is powered off, and the vehicle cannot be switched from the pumping operation to the running operation. Therefore, when the vehicle gearbox is in neutral gear, the state of the power take-off switch 130 can control the switching of the driving operation and the pumping operation of the vehicle, but when the vehicle gearbox is in non-neutral gear, the state of the power take-off switch 130 cannot control the switching of the driving operation and the pumping operation of the vehicle. In this embodiment, the neutral gear detection module 110 and the power take-off switch 130 jointly control the connection switching between the driving electromagnetic air valve 150 and the pumping electromagnetic air valve 160 and the power supply 100, so that the switching between the driving state and the pumping state can be realized only in the neutral gear state.
According to the technical scheme, the power takeoff protection circuit is provided, when the neutral gear detection module detects a neutral gear state, the first control part is conducted to be connected with a passage of a power supply, so that the first execution part of the switching master control module is conducted to be connected with the first end of the power supply; when the power take-off switch is closed, the switching module is used for switching the connection between the switching master control module and one of the running electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other one of the running electromagnetic air valve and the pumping electromagnetic air valve. According to the technical scheme, only when the neutral gear detection module detects the neutral gear state, the switching module can switch the connection paths of the driving electromagnetic air valve and the pumping electromagnetic air valve and the power supply, namely, only when the neutral gear state is achieved, the driving state and the pumping state can be switched, and gear and shifting fork inside the transfer case power takeoff are prevented from being damaged due to the fact that the transfer case power takeoff is not subjected to neutral gear operation when power takeoff is switched.
Fig. 2 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model, and further details of the switching module based on the above embodiment. As shown in fig. 2, the switching module 140 includes a second control part 141 and a second executing part 142, and the second control part 141 and the power switch 130 are connected in series with the power supply 100; the second control portion 141 is configured to control the second executing portion 142 to switch the connection between the switching master control module 120 and one of the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 to the connection between the switching master control module 120 and the other of the traveling electromagnetic valve 150 and the pumping electromagnetic valve 160 when the power take-off switch 130 is closed.
Optionally, the neutral gear detection module 110 and the first control portion 121 are connected in series at two ends of the power supply 100, the common end P0 of the first execution portion 122 is electrically connected with the first end of the power supply 100, the first end P1 of the first execution portion 122 is suspended, and the second end P2 of the first execution portion 122 is electrically connected with the common end N0 of the second execution portion 142; the first executing portion 122 is configured to control the common terminal P0 of the first executing portion 122 to be electrically connected to the second terminal P2 of the first executing portion 122 when the neutral detection module 110 detects a neutral, and to control the common terminal P0 of the first executing portion 122 to be electrically connected to the first terminal P1 of the first executing portion 122 when the neutral detection module 110 detects a non-neutral.
The second control part 141 and the power take-off switch 130 are connected in series at two ends of the power supply 100, the first end N1 of the second executing part 142 is electrically connected with the first end of the running electromagnetic air valve 150, the second end N2 of the second executing part 142 is electrically connected with the first end of the pumping electromagnetic air valve 160, and the second ends of the running electromagnetic air valve 150 and the pumping electromagnetic air valve 160 are respectively connected to the second end of the power supply 100; the second control portion 141 is configured to control the common terminal N0 of the second executing portion 142 to be electrically connected to the second terminal N2 of the second executing portion 142 when the power take-off switch 130 is turned on, and to control the common terminal N0 of the second executing portion 142 to be electrically connected to the first terminal N1 of the second executing portion 142 when the power take-off switch 130 is turned off.
Specifically, when the vehicle gearbox is in the neutral gear, the common end P0 of the first executing portion 122 of the switching master module 120 is connected to the second end P2 of the first executing portion 122, and the second end P2 of the first executing portion 122 of the switching master module 120 is connected to the common end N0 of the second executing portion 142 of the switching module 140. If the power take-off switch 130 is switched from off to on at this time, the second control part 141 of the switching module 140 is powered on, so that the common end N0 of the second execution part 142 of the switching module 140 is communicated with the second end N2 of the second execution part 142, while the second end N2 of the second execution part 142 is connected with the pumping electromagnetic valve 160, the pumping electromagnetic valve 160 is communicated with the power supply 100 through the second execution part 142 of the switching module 140 and the first execution part 122 of the switching master control module 120, the pumping electromagnetic valve 160 is powered on, and the vehicle is switched from running operation to pumping operation; if the power take-off switch 130 is switched from on to off at this time, the second control portion 141 of the switching module 140 is powered off, so that the common end N0 of the second execution portion 142 of the switching module 140 is communicated with the first end N1 of the second execution portion 142, while the first end N1 of the second execution portion 142 is connected with the running electromagnetic valve 150, the running electromagnetic valve 150 is communicated with the power supply 100 through the second execution portion 142 of the switching module 140 and the first execution portion 122 of the switching master control module 120, the running electromagnetic valve 150 is powered on, and the vehicle is switched from the pumping operation to the running operation.
When the vehicle gearbox is in a non-neutral gear, the first control portion 121 of the switching master control module 120 is powered off, so that the common end P0 of the first executing portion 122 of the switching master control module 120 is communicated with the first end P1 of the first executing portion 122, and the first end P1 of the first executing portion 122 is in a suspended state. If the power take-off switch 130 is switched from off to on at this time, the second control portion 141 of the switching module 140 is powered on, so that the common end N0 of the second executing portion 142 of the switching module 140 is communicated with the second end N2 of the second executing portion 142, and the second end N2 of the second executing portion 142 is connected with the pumping electromagnetic valve 160, but since the first executing portion 122 of the switching master control module 120 is in a suspended state, the pumping electromagnetic valve 160 cannot be communicated with the power supply 100 through the second executing portion 142 of the switching module 140 to lose electricity, so that the vehicle cannot be switched from driving operation to pumping operation; similarly, if the power take-off switch 130 is switched from on to off at this time, the second control portion 141 of the switching module 140 loses power, so that the common end N0 of the second executing portion 142 of the switching module 140 is connected to the first end N1 of the second executing portion 142, and the first end N1 of the second executing portion 142 is connected to the traveling electromagnetic valve 150, but since the first executing portion 122 of the switching master control module 120 is in a suspended state, the traveling electromagnetic valve 150 cannot be connected to the power supply 100 through the second executing portion 142 of the switching module 140, and thus the vehicle cannot be switched from pumping operation to traveling operation. Therefore, when the vehicle gearbox is in neutral gear, the state of the power take-off switch 130 can control the switching of the driving operation and the pumping operation of the vehicle, but when the vehicle gearbox is in non-neutral gear, the state of the power take-off switch 130 cannot control the switching of the driving operation and the pumping operation of the vehicle.
Fig. 3 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model, where the switching master control module and the switching module are further refined based on the above embodiment. As shown in fig. 3, optionally, the switching master module 120 includes a first relay, the first control part 121 includes a first coil, and the first executing part 122 includes a first common contact, a first normally open contact, and a first normally closed contact; the switching module 140 includes a second relay, the second control part 141 includes a second coil, and the second executing part 142 includes a second common contact, a second normally open contact, and a second normally closed contact.
The first common contact is used as a common end P0 of the first executing portion 122, the first normally closed contact is used as a first end P1 of the first executing portion 122, and the first normally open contact is used as a second end P2 of the first executing portion 122.
The second common contact is used as a common end N0 of the second executing part 142, the second normally closed contact is used as a first end N1 of the second executing part 142, and the second normally open contact is used as a second end N2 of the second executing part 142.
Specifically, when the vehicle transmission is in neutral, the neutral detection module 110 is turned on, the first coil of the first relay has a current flowing through it, the first common contact of the first actuator 122 is connected to the first normally open contact of the first actuator 122, and the first normally open contact of the first actuator 122 is connected to the second common contact of the second actuator 142. If the power take-off switch 130 is switched from off to on at this time, a current flows through the second coil of the second relay, so that the second common contact of the second execution part 142 is communicated with the second normally open contact of the second execution part 142, and the second normally open contact of the second execution part 142 is connected with the pumping electromagnetic valve 160, the pumping electromagnetic valve 160 is communicated with the power supply 100 through the second execution part 142 of the switching module 140 and the first execution part 122 of the switching master control module 120, the pumping electromagnetic valve 160 is powered on, and the vehicle is switched from a driving operation to a pumping operation; if the power take-off switch 130 is switched from on to off at this time, the second coil of the switching module 140 is de-energized, so that the second common contact of the second executing portion 142 is communicated with the second normally-closed contact of the second executing portion 142, and the second normally-closed contact of the second executing portion 142 is connected with the traveling electromagnetic valve 150, the traveling electromagnetic valve 150 is communicated with the power supply 100 through the second executing portion 142 of the switching module 140 and the first executing portion 122 of the switching master control module 120, the traveling electromagnetic valve 150 is powered, and the vehicle is switched from the pumping operation to the traveling operation.
When the vehicle transmission is in a non-neutral gear, the neutral gear detection module 110 is turned off, no current flows through the first coil of the first relay, the first common contact of the first actuator 122 is connected to the first normally-closed contact of the first actuator 122, and the first normally-closed contact of the first actuator 122 is in a suspended state. If the power take-off switch 130 is switched from off to on at this time, a current flows through the second coil of the second relay, so that the second common contact of the second executing part 142 is communicated with the second normally open contact of the second executing part 142, and the second normally open contact of the second executing part 142 is connected with the pumping electromagnetic valve 160, but since the first common contact of the first executing part 122 is in a suspended state, the pumping electromagnetic valve 160 cannot be communicated with the power supply 100 through the second executing part 142 of the switching module 140 to lose electricity, and the vehicle cannot be switched from running operation to pumping operation; similarly, if the power take-off switch 130 is switched from on to off at this time, the second coil of the switching module 140 is powered off, so that the second common contact of the second executing portion 142 is in communication with the second normally closed of the second executing portion 142, and the second normally closed contact of the second executing portion 142 is connected to the traveling electromagnetic valve 150, but since the first common contact of the first executing portion 122 is in a suspended state, the traveling electromagnetic valve 150 cannot be connected to the power supply 100 through the second executing portion 142 of the switching module 140, and thus the vehicle cannot be switched from the pumping operation to the traveling operation. Therefore, when the vehicle gearbox is in neutral gear, the state of the power take-off switch 130 can control the switching of the driving operation and the pumping operation of the vehicle, but when the vehicle gearbox is in non-neutral gear, the state of the power take-off switch 130 cannot control the switching of the driving operation and the pumping operation of the vehicle.
Fig. 4 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model, and fig. 5 is a position structure diagram of a driving position detection switch and a pumping position detection switch. As shown in fig. 4, the power take-off protection circuit may further include a driving position detection module 200, where the driving position detection module 200 includes a driving position detection switch 201 and a first indication unit 202, and the driving position detection switch 201 and the first indication unit 202 are at two ends of the power supply 100.
Optionally, the power takeoff protection circuit further includes a pumping bit detection module 210, where the pumping bit detection module 210 includes a pumping bit detection switch 211 and a second indicator unit 212, and the pumping bit detection switch 211 and the second indicator unit 212 are at two ends of the power supply 100.
Referring to fig. 4 and 5, specifically, the transfer case power takeoff internal gear is meshed and pushed by a shifting fork, the shifting fork is connected with a piston rod 240 in a cylinder 230, air cavities at two sides of the piston rod 240 in the cylinder 230 are respectively connected with a traveling electromagnetic air valve 150 and an air channel of a pumping electromagnetic air valve 160, an air cavity at a piston rod 240A side in the cylinder 230 is connected with a conducting air channel of the traveling electromagnetic air valve 150, an air cavity at a piston rod 240B side in the cylinder 230 is connected with a conducting air channel of the pumping electromagnetic air valve 160, when the traveling electromagnetic air valve 150 is powered on, the traveling electromagnetic air valve 150 conducts air in a vehicle air storage tank to the air cavity at the piston rod 240A side in the cylinder 230, when the pumping electromagnetic air valve 160 is powered on, the pumping electromagnetic air valve 160 conducts air in the vehicle air storage tank to the air cavity at the piston rod 240B side in the cylinder 230, and the air pushing piston rod 240 in the cylinder 230 is moved to the direction of the pumping position detection switch 211, and the gear meshing is pushed by the electromagnetic air valve being powered off. The running position detecting switch 201 and the pumping position detecting switch 211 are installed at both ends of the cylinder 230 to detect whether the piston rod 240 in the cylinder 230 reaches the end of the cylinder 230. When the piston rod 240 moves to the mounting end of the running position detection switch 201, the running position detection switch 201 is closed, which indicates that the internal gear of the power take-off is fully engaged to the running position, and when the piston rod 240 moves to the mounting end of the pumping position detection switch 211, the pumping position detection switch 211 is closed, which indicates that the internal gear of the power take-off is fully engaged to the pumping position. If the piston rod 240 is not moved to both ends of the cylinder 230, neither the running position detection switch 201 nor the pumping position detection switch 211 is closed, indicating that the gear is stuck in a certain position in the middle or is not completely engaged. The first indicating unit 202 is arranged in the cab and connected with the running position detecting switch 201, when the running position detecting switch 201 is closed, the first indicating unit 202 sends out a signal to prompt an operator, otherwise, the first indicating unit 202 does not respond; the second indicating unit 212 is installed in the cab and connected with the pumping position detecting switch 211, when the pumping position detecting switch 211 is closed, the second indicating unit 212 sends out a signal to prompt the operator, otherwise, the second indicating unit 212 does not respond.
According to the technical scheme provided by the embodiment, the running position detection and pumping position detection switch and the indicating unit are added to prompt the operator whether the internal gear of the power takeoff is completely meshed in place, so that the damage to the power takeoff caused by failure in meshing or incomplete meshing of the internal gear of the power takeoff is avoided.
Fig. 6 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model. As shown in fig. 6, the power take-off protection circuit diagram further includes a main pump unloading control module 220, where the main pump unloading control module 220 includes a third relay 221 and a main pump unloading solenoid valve 222, a first end of a third coil 2212 of the third relay 221 is connected to a common end of the pumping position detection switch 211 and the second indication unit 212, and a second end of the third coil 2212 is connected to a second end of the power supply 100.
The third common contact of the third relay 221 is connected to the common end of the power take-off switch 130 and the switching module 140, the third normally open contact of the third relay 221 is electrically connected to the first end of the main pump unloading solenoid valve 222, and the second end of the main pump unloading solenoid valve 222 is electrically connected to the second end of the power supply 100.
Specifically, when the power take-off switch 130 is switched from off to on, it is indicated that the vehicle is to be switched from running to pumping at this time, if the internal gear of the power take-off is fully engaged to the pumping position, the pumping position detection switch 211 is closed, the third coil 2212 of the third relay 221 has current flowing through it, the third common contact of the third relay 221 is connected to the third normally open contact of the third relay 221, and the third normally open contact of the third relay 221 is connected to the main pump unloading solenoid valve 222, the main pump unloading solenoid valve 222 is connected to the power supply 100 through the power take-off switch 130 to obtain electricity, and at this time, the main pump of the pumping hydraulic system does not unload normally work; if the internal gear of the power takeoff is not completely meshed to the pumping position, the pumping position detection switch 211 is turned off, no current flows through the third coil 2212 of the third relay 221, the third common contact of the third relay 221 is connected to the third normally-closed contact of the third relay 221, the third normally-closed contact of the third relay 221 is suspended, the main pump unloading electromagnetic valve 222 is powered off, at the moment, the main pump of the pumping hydraulic system is unloaded, and the vehicle does not perform pumping operation.
According to the technical scheme, when the internal gear of the power takeoff is not completely meshed to the pumping position, the work of the pumping hydraulic system is controlled through the unloading electromagnetic valve of the main pump, so that the situation that the internal gear of the power takeoff fails in meshing or the main pump does not unload to work with load when the internal gear of the power takeoff is not completely meshed is avoided, and the damage of the power takeoff is further aggravated.
Fig. 7 is a schematic structural diagram of another power takeoff protection circuit according to an embodiment of the present utility model. As shown in fig. 7, the power take-off protection circuit may further include a key switch 250, where the key switch 250 is connected in series between the first end of the power supply 100 and the switching master module 120.
Specifically, the key switch 250 controls whether the entire circuit can be connected to the power supply 100, and when a worker inserts a key into a keyhole of a vehicle and rotates the key to start an automobile power supply system, the key switch 250 is closed, the power supply 100 can supply power, whereas the key switch 250 is opened, and the power supply 100 cannot supply power to the circuit.
The embodiment of the utility model provides engineering machinery, which comprises the power takeoff protection circuit provided in any embodiment, and has the beneficial effects of the power takeoff protection circuit provided in any embodiment. In this embodiment, the engineering machine includes, but is not limited to, engineering machine products such as concrete pump trucks and mobile cranes.
The engineering machinery provided by the embodiment of the utility model can execute the power takeoff protection circuit provided by any embodiment of the utility model, and has the corresponding functional modules and beneficial effects of the execution circuit.
Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.
Claims (10)
1. A power take-off protection circuit, comprising: the device comprises a neutral gear detection module, a switching master control module, a power taking switch, a switching module, a driving electromagnetic air valve and a pumping electromagnetic air valve;
the neutral gear detection module is connected with the first control part of the switching master control module in series at two ends of the power supply, and the neutral gear detection module is used for conducting the connection of the first control part and the path of the power supply when detecting a neutral gear state so as to enable the first execution part of the switching master control module to conduct the connection of the switching module and the first end of the power supply;
the switching module is electrically connected with the first executing part, the power taking switch, the driving electromagnetic air valve and the pumping electromagnetic air valve respectively, and is used for switching the connection between the switching master control module and one of the driving electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other one of the driving electromagnetic air valve and the pumping electromagnetic air valve when the power taking switch is closed, and the driving electromagnetic air valve and the pumping electromagnetic air valve are also respectively connected with the second end of the power supply.
2. The power take-off protection circuit of claim 1, wherein the switching module comprises a second control portion and a second execution portion, the second control portion and the power take-off switch being connected in series with the power supply; and the second control part is used for controlling the second execution part to switch the connection between the switching master control module and one of the running electromagnetic air valve and the pumping electromagnetic air valve to the connection between the switching master control module and the other of the running electromagnetic air valve and the pumping electromagnetic air valve when the power take-off switch is closed.
3. The power takeoff protection circuit according to claim 2, wherein the neutral gear detection module and the first control portion are connected in series at two ends of a power supply, a common end of the first execution portion is electrically connected with a first end of the power supply, the first end of the first execution portion is suspended, and a second end of the first execution portion is electrically connected with a common end of the second execution portion; the first executing part is used for controlling the public end of the first executing part to be electrically connected with the second end of the first executing part when the neutral gear detection module detects neutral gear, and controlling the public end of the first executing part to be electrically connected with the first end of the first executing part when the neutral gear detection module detects non-neutral gear;
the second control part and the power take-off switch are connected in series at two ends of the power supply, the first end of the second execution part is electrically connected with the first end of the driving electromagnetic air valve, the second end of the second execution part is electrically connected with the first end of the pumping electromagnetic air valve, and the second ends of the driving electromagnetic air valve and the pumping electromagnetic air valve are respectively connected to the second end of the power supply; the second control part is used for controlling the public end of the second execution part to be electrically connected with the second end of the second execution part when the power take-off switch is closed, and controlling the public end of the second execution part to be electrically connected with the first end of the second execution part when the power take-off switch is opened.
4. The power take-off protection circuit of claim 3, wherein the switching master control module comprises a first relay, the first control portion comprises a first coil, and the first execution portion comprises a first common contact, a first normally open contact, and a first normally closed contact; the switching module comprises a second relay, the second control part comprises a second coil, and the second executing part comprises a second common contact, a second normally open contact and a second normally closed contact;
the first common contact is used as a common end of the first executing part, the first normally-closed contact is used as a first end of the first executing part, and the first normally-open contact is used as a second end of the first executing part;
the second common contact is used as a common end of the second executing part, the second normally-closed contact is used as a first end of the second executing part, and the second normally-open contact is used as a second end of the second executing part.
5. The power take-off protection circuit of claim 1, further comprising: the driving position detection module comprises a driving position detection switch and a first indication unit, and the driving position detection switch and the first indication unit are arranged at two ends of the power supply.
6. The power take-off protection circuit of claim 1, further comprising: the pumping bit detection module comprises a pumping bit detection switch and a second indication unit, and the pumping bit detection switch and the second indication unit are arranged at two ends of the power supply.
7. The power takeoff protection circuit of claim 6, further comprising a main pump unloading control module including a third relay and a main pump unloading solenoid valve, a first end of a third coil of the third relay being connected to a common end of the pumping position detection switch and the second indication unit, a second end of the third coil being connected to a second end of the power supply;
the third common contact of the third relay is connected to the common end of the power taking switch and the switching module, the third normally open contact of the third relay is electrically connected with the first end of the main pump unloading electromagnetic valve, and the second end of the main pump unloading electromagnetic valve is electrically connected with the second end of the power supply.
8. The power take-off protection circuit of claim 1, further comprising: the key switch is connected in series between the first end of the power supply and the switching master control module.
9. The power take-off protection circuit of any one of claims 1-8, wherein said neutral detection module comprises a neutral detection switch.
10. A construction machine comprising a power take-off protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322394095.7U CN220622707U (en) | 2023-09-04 | 2023-09-04 | Power takeoff protection circuit and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322394095.7U CN220622707U (en) | 2023-09-04 | 2023-09-04 | Power takeoff protection circuit and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220622707U true CN220622707U (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322394095.7U Active CN220622707U (en) | 2023-09-04 | 2023-09-04 | Power takeoff protection circuit and engineering machinery |
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| Country | Link |
|---|---|
| CN (1) | CN220622707U (en) |
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2023
- 2023-09-04 CN CN202322394095.7U patent/CN220622707U/en active Active
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