CN113639839B - Control method of logistics vehicle weighing sensor protection device - Google Patents
Control method of logistics vehicle weighing sensor protection device Download PDFInfo
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- CN113639839B CN113639839B CN202110293268.9A CN202110293268A CN113639839B CN 113639839 B CN113639839 B CN 113639839B CN 202110293268 A CN202110293268 A CN 202110293268A CN 113639839 B CN113639839 B CN 113639839B
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- positioning
- oil cylinder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
A protection device and a control method for a logistics vehicle weighing sensor comprise an axle, a lifting oil cylinder, an oil cylinder connecting disc, a lifting centering conical shaft, a lifting centering conical hole, a carriage base plate, a weighing contact, a weighing sensor, an assembly adjusting pad, a sensor base, a lifting limiting plate, a reinforcing rib, a positioning safety plate, a positioning safety conical shaft, a positioning guide support, a positioning oil cylinder connecting disc, a positioning safety oil cylinder, an oil cylinder hydraulic control module and an electrical control module, wherein when a carriage and a weighing object are in a lifting lower position (weighing state), the weighing sensor performs free weighing in a state without any limitation, and weighing precision is improved; when the carriage is lifted and lowered (in a transportation state) together with the weighing object, the weighing sensor is separated from the carriage and the weighing object, and the logistics vehicle sensor weighing device is protected and controlled in the transportation state.
Description
Technical Field
The invention relates to the field of weighing sensor protection devices and control, in particular to a logistics vehicle weighing sensor protection device and a control method.
Background
The logistics vehicle sensor weighing principle is that the gravity of a weighed object acts on a sensor body and is transferred to a sensor body which is stuck on an internal chip to generate micro elastic deformation, stress strain is measured and calculated according to the micro elastic deformation, and the stress strain is collected, processed and amplified to weigh the weight value of the object. When the logistics vehicle adopts the sensor device to weigh, usually according to sensor structure with screw thread fixed connection for both ends (one end is passed through sensor device support and axle connection, the other end is connected with the carriage and the object of weighing), make and weigh the heavy object, the carriage, the sensor, the support, the axle becomes an organic whole, the restriction to sensor device both ends has been increased, produce centrifugal bending moment direct influence under the gravity action through the focus in the non-simple, make the weighing accuracy decline of logistics vehicle weighing sensor device, weighing sensor device pressurized throughout in the transportation simultaneously leads to weighing sensor device life-span to reduce.
Disclosure of Invention
The invention provides a protection device and a control method for a weighing sensor of a logistics vehicle, which are characterized in that according to two working states of weighing and transporting: firstly, when the upper vehicle is lifted and lowered in a transportation state, the carriage, the heavy object, the sensor device, the support and the axle are connected into a whole with higher rigidity, so that the safe transportation of the vehicle is ensured; and secondly, when the weighing state of the lower heavy object is lifted, the vehicle is stopped, the carriage and the heavy object fall down, the carriage and the heavy object are in contact with the upper end of the sensor device in an unrestricted state through the weighing contact and are weighed in a free state, the lower end of the sensor device is fixedly connected with the axle thread through the sensor connecting base, namely the scale pan base is fixed, but the weighing object is not limited, the problem that the weighing precision is reduced due to the influence of centrifugal bending moment is avoided, the vehicle-mounted weighing precision is improved, and the weighing sensor device is protected.
The purpose of the invention patent is realized as follows: the logistics vehicle weighing sensor protection device is characterized by comprising an axle (1), a lifting oil cylinder (2), an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5), a carriage base plate (6), a weighing contact (7), a weighing sensor (8), an assembly adjusting pad (9), a sensor base (10), a lifting limiting plate (11), a reinforcing rib (12), a positioning safety plate (13), a positioning safety conical shaft (14), a positioning guide support (15), a positioning oil cylinder connecting disc (16), a safety positioning oil cylinder (17), an oil cylinder hydraulic control module (18) and an electric control module (19),
furthermore, a lifting oil cylinder (2) is fixedly connected with the outer side of the axle (1) in a welding way, an oil cylinder connecting disc (3) is connected with the end part of a piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) is fixedly connected with a lifting centering conical shaft (4) through a bolt, the conicity of the lifting centering conical shaft (4) and the conicity of a lifting centering conical hole (5) are 1:3, the base of the lifting centering conical hole (5) is fixedly connected with a carriage base plate (6) in a welding way,
furthermore, a weighing contact (7) is fixedly connected with a carriage base plate (6) in a welding way, a sensor base (10) is placed on the axle (1) and fixedly connected in a welding way, an assembly adjusting pad (9) is arranged between a weighing sensor (8) and the sensor base (10) and fixedly connected with the same through a bolt,
furthermore, a lifting limit plate (11) is fixedly connected with the outer side of the axle (1) in a welding way and is fastened by a reinforcing rib (12), a positioning safety plate (13) is fixedly connected with a carriage backing plate (6) in a welding way, the lifting limit plate (11) and the positioning safety plate (13) are provided with taper holes with the taper of 1:12,
furthermore, a safety positioning oil cylinder (17) is fixedly connected with the outer side of the axle (1) in a welding mode, a positioning oil cylinder connecting plate (16) is arranged at the end portion of a piston rod of the safety positioning oil cylinder (17), a push rod of a positioning safety conical shaft (14) is connected with the positioning oil cylinder connecting plate (16) through a positioning guide support (15), the taper of the positioning safety conical shaft (14) is 1:12, and a lifting limiting plate (11) and a positioning safety plate (13) are fixed through inserting locks.
The hydraulic control module for the oil cylinder (18) is characterized by comprising an oil tank (18-1), an oil pump (18-2), an overflow valve (18-3), a three-position four-way electromagnetic directional valve (1 (18-4) and a three-position four-way electromagnetic directional valve (2 (18-5), wherein the oil pump (18-2) provides pressure oil for an oil cylinder system through the overflow valve (18-3), the three-position four-way electromagnetic directional valve (1 (18-4) controls a piston rod of a lifting oil cylinder (2) to move up and down, and the three-position four-way electromagnetic directional valve (2 (18-5) controls a piston rod of a safety positioning oil cylinder (17) to move left and right.
The electric control module (19) comprises a double-contact transport button (YSK), a transport line relay (YSJ), a limit positioning travel switch (XWDWK), a limit positioning line relay (XWDWJ), a double-contact cancel positioning button (CXDWK), a cancel positioning line relay (CXDWJ), a weighing button (CZK) and a weighing line relay (CZJ), wherein the double-contact transport button (YSK) and the double-contact cancel positioning button (CXDWK) are provided with normally closed contacts and normally open contacts, the transport line relay (YSJ), the limit positioning line relay (XWDWJ), the cancel positioning line relay (CXDWJ) and the weighing line relay (CZJ) are provided with normally closed contacts and normally open contacts.
The protection control method of the logistics vehicle weighing sensor protection device is as follows: when the carriage and the weighing object are lifted up (in a transportation state), a double-contact transportation button (YSK) is pressed down, a normally closed contact of the carriage cuts off a weighing line firstly, then a normally open contact of the carriage is closed, after the carriage stays for 2 seconds, a transportation line relay (YSJ) is electrified and a movable contact of the transportation line relay is closed, and the transportation line relay (YSJ) is electrified and self-locked; an oil pump (18-2) is started to set the pressure of system pressure oil through an overflow valve (18-3) and provide the system with the pressure oil, an electromagnetic coil DT1 of a three-position four-way electromagnetic directional valve 1 (18-4) is electrified, the right position of the three-position four-way electromagnetic directional valve 1 (18-4) is in a working state, the pressure oil enters the lower cavity of a lifting oil cylinder (2) through the right position of the three-position four-way electromagnetic directional valve 1 (18-4) to push a piston rod of the lifting oil cylinder (2) to move upwards, meanwhile, the pressure oil in the upper cavity of the lifting oil cylinder (2) returns to an oil tank (18-1) through the right position of the three-position four-way electromagnetic directional valve 1 (18-4), the piston rod of the lifting oil cylinder (2) moves upwards to enable a lifting centering conical shaft (4) to move upwards through an oil cylinder connecting disc (3) and meet a lifting centering conical hole (5) to shift centering and drive a carriage base plate (6) together with a carriage and a weighing object, The positioning safety plate (13) rises together, when the positioning safety plate (13) touches a lifting limit plate (11), the resistance of the lifting oil cylinder (2) is increased again, when the system pressure is increased to a set value, the system pressure is kept and the lifting is stopped, at the moment, a limiting and positioning travel switch (XWDWK) on the lifting limit plate (11) is pressed, a limiting and positioning line relay (XWDWJ) is electrified, a dynamic contact of the limiting and positioning line relay (XWDWJ) is closed, the limiting and positioning line relay (XWDWJ) is electrified and self-locked, meanwhile, an electromagnetic coil DT3 of the three-position four-way electromagnetic reversing valve 2 (18-5) is electrified, the right position of the three-position four-way electromagnetic reversing valve 2 (18-5) is in a working state, pressure oil enters the right cavity of the safety positioning oil cylinder (17) through the right position of the three-position four-way electromagnetic reversing valve 2 (18-5), a piston rod of the safety positioning oil cylinder (17) is pushed to move leftwards and passes through a positioning oil cylinder connecting plate (16), the positioning safety conical shaft (14) moves leftwards under the support of the positioning guide support (15), and stops moving leftwards when moving to be in clearance-free fit with conical holes on the positioning safety plate (13) and the lifting limit plate (11), so that the self-locking function of the set positioning safety oil way pressure value and the adopted taper of 1:12 in the horizontal direction in the vertical direction is maintained, and the protection control function is realized on the weighing sensor of the logistics vehicle in the transportation state.
After transportation is finished, when a carriage and a weighing object are lifted down (in a weighing state), a normally closed contact of a double-contact cancel positioning button (CXDWK) is pressed down to cut off a limit positioning circuit firstly, then a normally open contact is closed, after the normally open contact stays for 2 seconds, a cancel positioning circuit relay (CXDWJ) is electrified and a dynamic contact thereof is closed, the cancel positioning circuit relay (CXDWJ) is electrified and self-locked, meanwhile, an electromagnetic coil DT4 of a three-position four-way electromagnetic directional valve 2 (18-5) is electrified, the left position of the three-position four-way electromagnetic directional valve 2 (18-5) is in a working state, pressure oil enters a left cavity of a safety positioning oil cylinder (17) through the left position of the three-position four-way electromagnetic directional valve 2 (18-5), a piston rod of the safety positioning oil cylinder (17) is pushed to move rightwards, and simultaneously pressure oil in the right cavity of the safety positioning oil cylinder (17) flows back to an oil tank (18-1) through the left position of the directional valve, a piston rod of a safety positioning oil cylinder (17) moves rightwards, a positioning safety conical shaft (14) moves rightwards to the stroke starting end through a positioning oil cylinder connecting disc (16) and is supported by a positioning guide support (15), a weighing button (CZK) is pressed down, a weighing line relay (CZJ) is electrified and a dynamic contact thereof is closed, the weighing line relay (CZJ) is electrified and self-locked, an electromagnetic coil DT2 of a three-position four-way electromagnetic reversing valve 1 (18-4) is electrified, the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) is in a working state, pressure oil enters an upper cavity of a lifting oil cylinder (2) through the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) and pushes a piston rod of the lifting oil cylinder (2) to enable an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5) and a carriage base plate (6) to move downwards, meanwhile, pressure oil in the lower cavity of the lifting oil cylinder (2) flows back to the oil tank (18-1) through the left position of the three-position four-way electromagnetic directional valve 1 (18-4), the carriage and the weighing object move downwards under the action of vertical downward gravity until the weighing contact (7) is contacted with the upper end of the weighing sensor (8), the carriage and the weighing object stop moving downwards, free weighing is carried out under the condition of no limitation, and the piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) and the lifting centering conical shaft (4) continue to move downwards to the original position. In a weighing state, a sufficient gap is reserved between the taper shaft of the lifting centering taper shaft (4) and the taper hole of the lifting centering taper hole (5) in the diameter direction, and certain allowance in the horizontal direction is not prevented in free weighing.
Has the advantages that: when the carriage and the weighing object are lifted up (in a transportation state), the weighing sensor is separated from the carriage and the weighing object, so that the logistics vehicle sensor weighing device in the transportation state is protected; meanwhile, when the carriage and the weighing object are lifted and lowered (in a weighing state), the weighing sensor can freely weigh without any limitation, and the weighing precision is improved.
Drawings
FIG. 1 is a system configuration of the present invention (in a weighing state);
FIG. 2 is a system block diagram of the present invention (in a transport state);
FIG. 3 is a diagram of a hydraulic control module of the cylinder according to the present invention;
FIG. 4 is a diagram of an electrical control module of the present invention;
in the figure: 1. an axle; 2. a lift cylinder; 3. an oil cylinder connecting plate; 4. lifting and centering the conical shaft; 5. lifting and centering the taper hole; 6. a carriage base plate; 7. a weighing contact; 8. a weighing sensor; 9. assembling an adjusting pad; 10. a sensor base; 11. a lifting limit plate; 12. reinforcing ribs; 13. positioning a safety plate; 14. positioning a safety cone shaft; 15. positioning a guide support; 16. positioning an oil cylinder connecting plate; 17. a safety positioning oil cylinder; 18. an oil cylinder hydraulic control module; 19. an electrical control module; 18-1, an oil tank; 18-2, an oil pump; 18-3, an overflow valve; 18-3, a three-position four-way electromagnetic directional valve 1; 18-5, and a three-position four-way electromagnetic directional valve 2.
Detailed Description
Example 1: a logistics vehicle weighing sensor protection device comprises an axle (1), a lifting oil cylinder (2), an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5), a carriage base plate (6), a weighing contact (7), a weighing sensor (8), an assembly adjusting pad (9), a sensor base (10), a lifting limiting plate (11), a reinforcing rib (12), a positioning safety plate (13), a positioning safety conical shaft (14), a positioning guide support (15), a positioning oil cylinder connecting disc (16), a safety positioning oil cylinder (17), an oil cylinder hydraulic control module (18) and an electric control module (19),
the lifting oil cylinder (2) is fixedly connected with the outer side of the axle (1) in a welding way, the oil cylinder connecting disc (3) is connected with the end part of a piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) is fixedly connected with the lifting centering conical shaft (4) through a bolt, the conicity of the lifting centering conical shaft (4) and the lifting centering conical hole (5) is 1:3, the base of the lifting centering conical hole (5) is fixedly connected with the carriage base plate (6) in a welding way,
the weighing contact (7) is fixedly connected with the carriage base plate (6) in a welding way, the sensor base (10) is placed on the axle (1) and fixedly connected in a welding way, an assembly adjusting pad (9) is arranged between the weighing sensor (8) and the sensor base (10) and fixedly connected with the same through a bolt,
the lifting limit plate (11) is fixedly connected with the outer side of the axle (1) in a welding way and is fastened by a reinforcing rib (12), the positioning safety plate (13) is fixedly connected with the carriage backing plate (6) in a welding way, the lifting limit plate (11) and the positioning safety plate (13) are provided with taper holes with the taper of 1:12,
the safety positioning oil cylinder (17) is fixedly connected with the outer side of the axle (1) in a welding mode, a positioning oil cylinder connecting disc (16) is arranged at the end portion of a piston rod of the safety positioning oil cylinder (17), a push rod of the positioning safety conical shaft (14) is connected with the positioning oil cylinder connecting disc (16) through a positioning guide support (15), the taper of the positioning safety conical shaft (14) is 1:12, and the lifting limiting plate (11) and the positioning safety plate (13) are fixed through inserting and locking.
The hydraulic control module for the oil cylinder (18) is characterized by comprising an oil tank (18-1), an oil pump (18-2), an overflow valve (18-3), a three-position four-way electromagnetic directional valve (1 (18-4) and a three-position four-way electromagnetic directional valve (2 (18-5), wherein the oil pump (18-2) provides pressure oil for an oil cylinder system through the overflow valve (18-3), the three-position four-way electromagnetic directional valve (1 (18-4) controls a piston rod of a lifting oil cylinder (2) to move up and down, and the three-position four-way electromagnetic directional valve (2 (18-5) controls a piston rod of a safety positioning oil cylinder (17) to move left and right.
The electric control module (19) comprises a double-contact transport button (YSK), a transport line relay (YSJ), a limit positioning travel switch (XWDWK), a limit positioning line relay (XWDWJ), a double-contact cancel positioning button (CXDWK), a cancel positioning line relay (CXDWJ), a weighing button (CZK) and a weighing line relay (CZJ), wherein the double-contact transport button (YSK) and the double-contact cancel positioning button (CXDWK) are provided with normally closed contacts and normally open contacts, the transport line relay (YSJ), the limit positioning line relay (XWDWJ), the cancel positioning line relay (CXDWJ) and the weighing line relay (CZJ) are provided with normally closed contacts and normally open contacts.
The working process is as follows: when the carriage and the weighing object are lifted up (in a transportation state), a double-contact transportation button (YSK) is pressed down, a normally closed contact of the carriage cuts off a weighing line firstly, then a normally open contact of the carriage is closed, after the carriage stays for 2 seconds, a transportation line relay (YSJ) is electrified and a movable contact of the transportation line relay is closed, and the transportation line relay (YSJ) is electrified and self-locked; an oil pump (18-2) is started to set the pressure of system pressure oil through an overflow valve (18-3) and provide the system with the pressure oil, an electromagnetic coil DT1 of a three-position four-way electromagnetic directional valve 1 (18-4) is electrified, the right position of the three-position four-way electromagnetic directional valve 1 (18-4) is in a working state, the pressure oil enters the lower cavity of a lifting oil cylinder (2) through the right position of the three-position four-way electromagnetic directional valve 1 (18-4) to push a piston rod of the lifting oil cylinder (2) to move upwards, meanwhile, the pressure oil in the upper cavity of the lifting oil cylinder (2) returns to an oil tank (18-1) through the right position of the three-position four-way electromagnetic directional valve 1 (18-4), the piston rod of the lifting oil cylinder (2) moves upwards to enable a lifting centering conical shaft (4) to move upwards through an oil cylinder connecting disc (3) and meet a lifting centering conical hole (5) to shift centering and drive a carriage base plate (6) together with a carriage and a weighing object, The positioning safety plate (13) rises together, when the positioning safety plate (13) touches a lifting limit plate (11), the resistance of the lifting oil cylinder (2) is increased again, when the system pressure is increased to a set value, the system pressure is kept and the lifting is stopped, at the moment, a limiting and positioning travel switch (XWDWK) on the lifting limit plate (11) is pressed, a limiting and positioning line relay (XWDWJ) is electrified, a dynamic contact of the limiting and positioning line relay (XWDWJ) is closed, the limiting and positioning line relay (XWDWJ) is electrified and self-locked, meanwhile, an electromagnetic coil DT3 of the three-position four-way electromagnetic reversing valve 2 (18-5) is electrified, the right position of the three-position four-way electromagnetic reversing valve 2 (18-5) is in a working state, pressure oil enters the right cavity of the safety positioning oil cylinder (17) through the right position of the three-position four-way electromagnetic reversing valve 2 (18-5), a piston rod of the safety positioning oil cylinder (17) is pushed to move leftwards and passes through a positioning oil cylinder connecting plate (16), the positioning safety conical shaft (14) moves leftwards under the support of the positioning guide support (15), and stops moving leftwards when moving to be in clearance-free fit with conical holes on the positioning safety plate (13) and the lifting limit plate (11), so that the self-locking function of the set positioning safety oil way pressure value and the adopted taper of 1:12 in the horizontal direction in the vertical direction is maintained, and the protection control function is realized on the weighing sensor of the logistics vehicle in the transportation state.
When the transportation is finished, when a carriage and a weighing object are lifted down (in a weighing state), a normally closed contact of a double-contact cancel positioning button (CXDWK) is pressed down to cut off a limit positioning circuit firstly, then a normally open contact is closed, after the stop for 2 seconds, a positioning circuit relay (CXDWJ) is cancelled to be electrified and a dynamic contact thereof is closed, the positioning circuit relay (CXDWJ) is cancelled to be electrified and self-locked, meanwhile, an electromagnetic coil DT4 of a three-position four-way electromagnetic directional valve 2 (18-5) is electrified, the left position of the three-position four-way electromagnetic directional valve 2 (18-5) is in a working state, pressure oil enters the left cavity of a safety positioning oil cylinder (17) through the left position of the three-position four-way electromagnetic directional valve 2 (18-5) to push a piston rod of the safety positioning oil cylinder (17) to move rightwards, and simultaneously, the pressure oil in the right cavity of the safety positioning oil cylinder (17) flows back to an oil tank (18-1) through the left position of the directional valve, a piston rod of a safety positioning oil cylinder (17) moves rightwards, a positioning safety conical shaft (14) moves rightwards to the stroke starting end through a positioning oil cylinder connecting disc (16) and is supported by a positioning guide support (15), a weighing button (CZK) is pressed down, a weighing line relay (CZJ) is electrified and a dynamic contact thereof is closed, the weighing line relay (CZJ) is electrified and self-locked, an electromagnetic coil DT2 of a three-position four-way electromagnetic reversing valve 1 (18-4) is electrified, the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) is in a working state, pressure oil enters an upper cavity of a lifting oil cylinder (2) through the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) and pushes a piston rod of the lifting oil cylinder (2) to enable an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5) and a carriage base plate (6) to move downwards, meanwhile, pressure oil in the lower cavity of the lifting oil cylinder (2) flows back to the oil tank (18-1) through the left position of the three-position four-way electromagnetic directional valve 1 (18-4), the carriage and the weighing object move downwards under the action of vertical downward gravity until the weighing contact (7) is contacted with the upper end of the weighing sensor (8), the carriage and the weighing object stop moving downwards, free weighing is carried out under the condition of no limitation, and the piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) and the lifting centering conical shaft (4) continue to move downwards to the original position. In a weighing state, a sufficient gap is reserved between the taper shaft of the lifting centering taper shaft (4) and the taper hole of the lifting centering taper hole (5) in the diameter direction, and certain allowance in the horizontal direction is not prevented in free weighing.
Claims (1)
1. A control method of a logistics vehicle weighing sensor protection device is characterized by comprising an axle (1), a lifting oil cylinder (2), an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5), a carriage base plate (6), a weighing contact (7), a weighing sensor (8), an assembly adjusting pad (9), a sensor base (10), a lifting limiting plate (11), a reinforcing rib (12), a positioning safety plate (13), a positioning safety conical shaft (14), a positioning guide support (15), a positioning oil cylinder connecting disc (16), a safety positioning oil cylinder (17), an oil cylinder hydraulic control module (18) and an electric control module (19);
the lifting oil cylinder (2) is fixedly connected with the outer side of the axle (1) in a welding mode, an oil cylinder connecting disc (3) is connected with the end portion of a piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) is fixedly connected with a lifting centering conical shaft (4) through a bolt, the conicity of the lifting centering conical shaft (4) and the conicity of a lifting centering conical hole (5) are 1:3, and a base of the lifting centering conical hole (5) is fixedly connected with a carriage base plate (6) in a welding mode;
the weighing contact (7) is fixedly connected with a carriage base plate (6) in a welding mode, the sensor base (10) is placed on the axle (1) and fixedly connected in a welding mode, and the assembly adjusting pad (9) is arranged between the weighing sensor (8) and the sensor base (10) and fixedly connected through a bolt;
the lifting limit plate (11) is fixedly connected with the outer side of the axle (1) in a welding mode and is fastened by a reinforcing rib (12), the positioning safety plate (13) is fixedly connected with the carriage base plate (6) in a welding mode, the lifting limit plate (11) and the positioning safety plate (13) are provided with taper holes, and the taper of the taper holes is 1: 12;
a safety positioning oil cylinder (17) is fixedly connected with the outer side of the axle (1) in a welding mode, a positioning oil cylinder connecting disc (16) is arranged at the end of a piston rod of the safety positioning oil cylinder (17), a push rod of a positioning safety conical shaft (14) is connected with the positioning oil cylinder connecting disc (16) through a positioning guide support (15), the taper of the positioning safety conical shaft (14) is 1:12, and a lifting limiting plate (11) and a positioning safety plate (13) are fixed through mortise locking;
the oil cylinder hydraulic control module (18) comprises an oil tank (18-1), an oil pump (18-2), an overflow valve (18-3), a three-position four-way electromagnetic directional valve 1 (18-4) and a three-position four-way electromagnetic directional valve 2 (18-5), wherein the oil pump (18-2) provides pressure oil for an oil cylinder system through the overflow valve (18-3), electromagnetic coils DT1 and DT2 of the three-position four-way electromagnetic directional valve 1 (18-4) control a piston rod of the lifting oil cylinder (2) to move up and down, and electromagnetic coils DT3 and DT4 of the three-position four-way electromagnetic directional valve 2 (18-5) control a piston rod of the safety positioning oil cylinder (17) to move left and right;
the electric control module (19) comprises a double-contact transport button (YSK), a transport line relay (YSJ), a limit positioning travel switch (XWDWK), a limit positioning line relay (XWDWJ), a double-contact cancel positioning button (CXDWK), a cancel positioning line relay (CXDWJ), a weighing button (CZK) and a weighing line relay (CZJ), wherein the double-contact transport button (YSK) and the double-contact cancel positioning button (CXDWK) are provided with normally closed contacts and normally open contacts, and the transport line relay (YSJ), the limit positioning line relay (XWDWJ), the cancel positioning line relay (CXDWJ) and the weighing line relay (CZJ) are provided with a dynamic contact and a dynamic contact;
when a carriage and a weighed object are in a lifting upper-position transportation state, a double-contact transportation button (YSK) is pressed down to move downwards, a normally closed contact of the carriage firstly cuts off a weighing line, then a normally open contact of the carriage is closed, after the carriage stays for 2 seconds, a transportation line relay (YSJ) is electrified and a movable contact of the transportation line relay is closed, and the transportation line relay (YSJ) is electrified and self-locked; an oil pump (18-2) is started to set the pressure of system pressure oil through an overflow valve (18-3) and provide the system with the pressure oil, an electromagnetic coil DT1 of a three-position four-way electromagnetic directional valve 1 (18-4) is electrified, the right position of the three-position four-way electromagnetic directional valve 1 (18-4) is in a working state, the pressure oil enters the lower cavity of a lifting oil cylinder (2) through the right position of the three-position four-way electromagnetic directional valve 1 (18-4) to push a piston rod of the lifting oil cylinder (2) to move upwards, meanwhile, the pressure oil in the upper cavity of the lifting oil cylinder (2) flows through a right bit stream oil return tank (18-1) of the three-position four-way electromagnetic directional valve 1 (18-4), the piston rod of the lifting oil cylinder (2) moves upwards to enable a lifting centering conical shaft (4) to move upwards through an oil cylinder connecting plate (3) and meet a lifting centering conical hole (5) to shift centering and drive a carriage base plate (6) together with a carriage and a weighing object, The positioning safety plate (13) rises together, when the positioning safety plate (13) touches a lifting limit plate (11), the resistance of the lifting oil cylinder (2) is increased again, when the system pressure is increased to a set value, the system pressure is kept and the lifting is stopped, at the moment, a limiting and positioning travel switch (XWDWK) on the lifting limit plate (11) is pressed, a limiting and positioning line relay (XWDWJ) is electrified, a dynamic contact of the limiting and positioning line relay (XWDWJ) is closed, the limiting and positioning line relay (XWDWJ) is electrified and self-locked, meanwhile, an electromagnetic coil DT3 of the three-position four-way electromagnetic reversing valve 2 (18-5) is electrified, the right position of the three-position four-way electromagnetic reversing valve 2 (18-5) is in a working state, pressure oil enters the right cavity of the safety positioning oil cylinder (17) through the right position of the three-position four-way electromagnetic reversing valve 2 (18-5), a piston rod of the safety positioning oil cylinder (17) is pushed to move leftwards and passes through a positioning oil cylinder connecting plate (16), the positioning safety cone shaft (14) moves leftwards under the support of the positioning guide support (15), and stops moving leftwards when moving to be in clearance-free fit with the cone holes on the positioning safety plate (13) and the lifting limit plate (11), so that the set positioning safety oil way pressure value and the taper of 1:12 in the horizontal direction have a self-locking effect in the vertical direction, and the protection control effect on the logistics vehicle weighing sensor is realized in a transportation state;
when the transportation is finished, when a carriage and a weighing object are in a lifting lower position weighing state, a normally closed contact of a double-contact cancel positioning button (CXDWK) is pressed down to cut off a limit positioning circuit firstly, then a normally open contact is closed, after the stop for 2 seconds, a positioning circuit relay (CXDWJ) is cancelled to be electrified and a dynamic contact thereof is closed, the positioning circuit relay (CXDWJ) is cancelled to be electrified and self-locked, meanwhile, an electromagnetic coil DT4 of a three-position four-way electromagnetic directional valve 2 (18-5) is electrified, the left position of the three-position four-way electromagnetic directional valve 2 (18-5) is in a working state, pressure oil enters the left cavity of a safety positioning oil cylinder (17) through the left position of the three-position four-way electromagnetic directional valve 2 (18-5), a piston rod of the safety positioning oil cylinder (17) is pushed to move rightwards, and meanwhile, the pressure oil in the right cavity of the safety positioning oil cylinder (17) flows back to an oil tank (18-1) through the left position of the directional valve, a piston rod of a safety positioning oil cylinder (17) moves rightwards, a positioning safety conical shaft (14) moves rightwards to the stroke starting end through a positioning oil cylinder connecting disc (16) and is supported by a positioning guide support (15), a weighing button (CZK) is pressed down, a weighing line relay (CZJ) is electrified and a dynamic contact thereof is closed, the weighing line relay (CZJ) is electrified and self-locked, meanwhile, an electromagnetic coil DT2 of a three-position four-way electromagnetic reversing valve 1 (18-4) is electrified, the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) is in a working state, pressure oil enters an upper cavity of a lifting oil cylinder (2) through the left position of the three-position four-way electromagnetic reversing valve 1 (18-4) and pushes a piston rod of the lifting oil cylinder (2) to enable an oil cylinder connecting disc (3), a lifting centering conical shaft (4), a lifting centering conical hole (5) and a carriage base plate (6) to move downwards, meanwhile, pressure oil in the lower cavity of the lifting oil cylinder (2) flows back to the oil tank (18-1) through the left position of the three-position four-way electromagnetic reversing valve 1 (18-4), the carriage and the weighing object move downwards under the action of vertical downward gravity until the weighing contact (7) is contacted with the upper end of the weighing sensor (8), the carriage and the weighing object stop moving downwards and are freely weighed under the condition of not being limited by any part, and the piston rod of the lifting oil cylinder (2), the oil cylinder connecting disc (3) and the lifting centering conical shaft (4) continuously move downwards to the original position; and in a weighing state, a gap is reserved between the conical shaft of the lifting centering conical shaft (4) and the conical hole of the lifting centering conical hole (5) in the diameter direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| BE1013249A6 (en) * | 2000-01-26 | 2001-11-06 | Dhollandia Nv | Weighing device on a vehicle for net individual and gross total weights |
| US20030234122A1 (en) * | 2002-06-19 | 2003-12-25 | Kroll William P. | Fork tine scale technology |
| CN101893517A (en) * | 2010-07-28 | 2010-11-24 | 吉林大学 | Automobile stability parameter test bench and test method using same |
| CN203157804U (en) * | 2013-03-20 | 2013-08-28 | 上海宝钢工业技术服务有限公司 | Hydraulic system of tilting mechanism of self-discharging type carrier vehicle |
| CN203637647U (en) * | 2013-12-30 | 2014-06-11 | 河南农业大学 | Perpendicular lifting device for dedicated double-layer beef cattle carrier vehicle |
| CN104374460B (en) * | 2014-11-28 | 2016-09-28 | 中航电测仪器股份有限公司 | A kind of Vehicular fuel tank weighing device |
| CN109263615B (en) * | 2018-09-17 | 2023-11-03 | 福州科杰电子衡器有限公司 | Horizontal lifting internet of things weighing method of truck-mounted static internet of things weighing device of freight car |
| CN209507516U (en) * | 2019-01-03 | 2019-10-18 | 徐胜利 | A kind of moving lifting weighing platform |
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