CN106429779B - Suspension pneumatic lifting device and suspension pneumatic lifting method - Google Patents
Suspension pneumatic lifting device and suspension pneumatic lifting method Download PDFInfo
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- CN106429779B CN106429779B CN201610514277.5A CN201610514277A CN106429779B CN 106429779 B CN106429779 B CN 106429779B CN 201610514277 A CN201610514277 A CN 201610514277A CN 106429779 B CN106429779 B CN 106429779B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
- B66C13/14—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices to load-engaging elements or motors associated therewith
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- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention discloses a suspension pneumatic lifting device and a suspension pneumatic lifting method, wherein the suspension pneumatic lifting device comprises an air source, a power supply access circuit, a reversing valve, an electric proportional valve, a two-position three-way electromagnetic valve, a pneumatic lifting device, a controller and a tension sensor, wherein the reversing valve and the electric proportional valve are respectively connected with the air source and the two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is connected with the pneumatic lifting device, and the power supply access circuit is provided with a control switch for controlling power supply to the electric proportional valve, the two-position three-way electromagnetic valve and the controller; the controller compares the detected data value with a set value, and controls the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the detected data value is smaller than the set value, and controls the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the detected data value is larger than the set value. The suspension pneumatic lifting device and the suspension pneumatic lifting method can realize rapid lifting and descending of any weight of lifting objects.
Description
Technical Field
The invention relates to the technical field of hoisting equipment, in particular to a suspension pneumatic hoisting device and a suspension pneumatic hoisting method.
Background
At present, domestic lifting equipment mainly comprises a pneumatic hoist, an electric hoist, a pneumatic balance crane and the like. In the mechanical production and assembly industry, in particular to occasions requiring high lifting and positioning precision, the pneumatic hoist and the electric hoist generally cannot meet the requirements. The pneumatic control technology in China is developed very rapidly, the pneumatic balance crane is applied more and more widely, the suspension function of constant weight materials near the balance point is realized, and convenience is provided for the assembly industry in China. However, in the pneumatic balance crane in the current market, a control mode of separating no-load balance and heavy-load balance is adopted in the aspect of balance control, a heavy-load balance control mode aims at a heavy object with constant weight, and suspension balance lifting is carried out on the constant object by presetting a set value of a heavy-load pilot relief valve. However, for the occasion of non-production line assembly form, the whole-course suspension lifting of the heavy objects with different weights cannot be realized by the pneumatic balancer, and an operator needs to provide great operating force to lift or lower the heavy objects, so that the suspension lifting range of the pneumatic balancer is greatly reduced, and the availability of the production capacity is reduced. Accordingly, the current pneumatic balance control system has a number of disadvantages, which are in need of improvement and perfection.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims at: a suspension pneumatic lifting device is provided.
Another object of the invention is: a suspension pneumatic lifting method is provided.
The aim of the invention is achieved by the following technical scheme: the utility model provides a suspension pneumatic lifting device, includes air supply, power access circuit, switching-over valve, electric proportional valve, two-position three-way solenoid valve, pneumatic lifting device, controller and tension sensor, and switching-over valve and electric proportional valve are connected with air supply and two-position three-way solenoid valve respectively, and two-position three-way solenoid valve is connected with pneumatic lifting device, and power access circuit has the control switch that is used for controlling to electric proportional valve, two-position three-way solenoid valve and controller power supply;
the tension sensor is arranged on the execution end of the pneumatic lifting device and is used for measuring the weight of the lifting object;
the controller is used for receiving detection data of the tension sensor, comparing the detection data value with a set value, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the detection data value is smaller than the set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the detection data value is larger than the set value.
Preferably, the tension sensor comprises a first tension sensor and a second tension sensor, wherein the first tension sensor is connected to the execution end of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the first tension sensor and the second tension sensor are respectively connected with the controller, and the first tension sensor is used for measuring the total weight of an object connected below the first tension sensor;
the second tension sensor is used for measuring the weight of the hoisted object;
the controller is used for receiving detection data of the first tension sensor and the second tension sensor, comparing the two detection data values, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is smaller than a set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is larger than the set value.
Preferably, the pneumatic lifting device further comprises an operating handle, the first tension sensor, the operating handle and the second tension sensor are sequentially connected, and the lower end of the second tension sensor is a hanging part.
Preferably, the reversing valve is a manual reversing valve.
Preferably, the controller is a PLC controller.
Preferably, the power supply access circuit comprises a main switch connected with the mains supply and a direct current converter for converting alternating current into direct current, the control switch is a normally-off switch, the main switch, the normally-off switch and the direct current converter are sequentially connected, and the electric proportional valve, the two-position three-way electromagnetic valve and the controller are respectively connected with the direct current converter.
Preferably, the system further comprises a computer, and the computer is connected with the PLC.
A method of suspension pneumatic lifting, the method comprising in particular:
s1, hanging a hoisted object on a tension sensor;
s2, communicating an air source with a two-position three-way electromagnetic valve through a reversing valve, wherein at the moment, a normally-open switch is in a disconnected state, the two-position three-way electromagnetic valve is in an initial state, and the reversing valve is communicated with a pneumatic lifting device, and the pneumatic lifting device drives a lifting object to lift;
s3, when the valve rises to a required position, the valve is normally disconnected Guan Geshang, and at the moment, the two-position three-way electromagnetic valve is connected with a power supply access circuit, the direction of the two-position three-way electromagnetic valve is switched, the connection with the reversing valve is disconnected, and the valve is switched to be communicated with the electric proportional valve;
s4, the tension sensor measures the weight of the hoisted object in real time, and sends detected data obtained by detection to the controller;
s5, the controller compares the received detection data with a set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s6, if the hoisted object is required to be lifted, manually applying upward force to the hoisted object, and at the moment, comparing the received detection data with a set value by the controller to obtain the following result: the detection data value is smaller than the set value, the controller controls the electric proportional valve to connect the air inlet and the two-position three-way electromagnetic valve to the pneumatic lifting device for pumping air, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from applying upward force, at the moment, the controller compares the received detection data with the set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s7, if the hoisted object is required to descend, selecting one of the following two operation modes:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received detection data with a set value by the controller, and obtaining the following result: the detection data value is greater than the setting value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is exhausted, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received detection data with the setting value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the reversing valve exhaust port is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed into or discharged from the reversing valve, and the pneumatic lifting device maintains pressure.
Preferably, the tension sensor comprises a first tension sensor and a second tension sensor, wherein the first tension sensor is connected to the execution end of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the step S4 specifically includes: the first tension sensor measures the total weight of the object connected below the first tension sensor;
the second tension sensor measures the weight of the hoisted object;
the step S5 specifically comprises the following steps: at the moment, the difference value of the two detection data values is equal to a set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
the step S6 specifically includes: if the hoisted object is required to be lifted, upward force is manually applied to the hoisted object, at the moment, the controller compares the received two detection data values, and the obtained result is as follows: the difference value of the two detection data values is smaller than a set value, the electric proportional valve is controlled to communicate the air inlet with the two-position three-way electromagnetic valve, the air is pumped to the pneumatic lifting device, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from exerting upward force, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
the step S7 specifically includes: if the hoisted object is required to descend, one of the following two operation modes can be selected:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received two detection data values by the controller, and obtaining the following result: the difference value of the two detection data values is larger than a set value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the exhaust port of the reversing valve is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed or exhausted, and the pneumatic lifting device maintains pressure;
when vibration is generated, the detection data detected by the first tension sensor and the second tension sensor are increased or reduced simultaneously, the difference value of the two detection data values is still equal to the set value, the electric proportional valve is kept in the middle position, air is not fed in, air is not discharged, and the pneumatic lifting device maintains pressure.
Preferably, the pneumatic lifting device further comprises an operating handle, wherein the executing end of the pneumatic lifting device, the first tension sensor, the operating handle and the second tension sensor are sequentially connected, and the lower end of the second tension sensor is a hanging part;
the step S6 is that the lifting object is manually pulled upwards by applying upward force to the lifting object manually;
the manual downward force applied to the hoisted object in step S7 is manual downward pulling of the operating handle.
Compared with the prior art, the invention has the following advantages and effects:
1. the suspension pneumatic lifting device and the suspension pneumatic lifting method can realize the functions of rapid lifting and rapid lowering of any weight of lifting objects; the invention can realize the whole-process suspension effect in the whole rising, falling and conveying processes aiming at different weight loads, improves the assembly precision and the production efficiency, and particularly can stably carry all parts and ensure high positioning precision in the assembly process of industrial production.
When the power failure suddenly occurs, the two-position three-way electromagnetic valve is reset immediately and is switched to be connected with the reversing valve, so that the power failure protection effect is achieved, the hoisted objects can keep the original positions and cannot suddenly descend, and safety accidents are avoided.
2. The first tension sensor and the second tension sensor can avoid false execution caused by false judgment of the controller due to vibration, and ensure that the suspension effect has certain stability, thereby being beneficial to the industrial assembly process.
3. Compared with a pure pneumatic suspension control system, the invention greatly simplifies a pneumatic control loop and reduces pneumatic control elements by adopting electric control.
4. The adoption of the PLC is beneficial to realizing a complex and precise control algorithm, improving the control precision and reducing the response time.
Drawings
Fig. 1 is a schematic structural view of a suspension pneumatic lifting device according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a suspension pneumatic lifting device according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Embodiment one:
the utility model provides a suspension pneumatic lifting device, including air supply 1, power access circuit, switching-over valve 2, electric proportional valve 3, two-position three way solenoid valve 4, normally-off switch 5, pneumatic lifting device 6, controller 7, check valve 18 and tension sensor, switching-over valve and electric proportional valve are connected with air supply and two-position three way solenoid valve respectively, two-position three way solenoid valve is connected with pneumatic lifting device, power access circuit has and is used for controlling the normally-off switch to electric proportional valve, two-position three way solenoid valve and controller power supply, the check valve sets up on the delivery outlet of air supply;
the tension sensor is arranged on the execution end of the pneumatic lifting device and is used for measuring the weight of the lifting object;
the controller is used for receiving detection data of the tension sensor, comparing the detection data value with a set value, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the detection data value is smaller than the set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the detection data value is larger than the set value.
Preferably, the reversing valve is a manual reversing valve.
Preferably, the controller is a PLC controller.
Preferably, the power supply access circuit comprises a main switch 15 connected with the mains supply 14 and a direct current converter 16 for converting alternating current into direct current, wherein the main switch, the normally-off switch and the direct current converter are sequentially connected, and the electric proportional valve, the two-position three-way electromagnetic valve and the controller are respectively connected with the direct current converter.
Preferably, a computer 17 is also included, which is connected to the PLC controller. The computer may assist the PLC controller in processing and assisting in programming portions of the data.
Embodiment two:
the first difference between this embodiment and the second embodiment is that: the tension sensor comprises a first tension sensor 8 and a second tension sensor 9, wherein the first tension sensor is connected to an execution end 10 of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the first tension sensor and the second tension sensor are respectively connected with the controller, and the first tension sensor is used for measuring the total weight of an object connected below the first tension sensor;
the second tension sensor is used for measuring the weight of the hoisted object 11;
the controller is used for receiving detection data of the first tension sensor and the second tension sensor, comparing the two detection data values, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is smaller than a set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is larger than the set value.
Preferably, the device further comprises an operating handle 12, a pneumatic lifting device, a first tension sensor, the operating handle and a second tension sensor which are sequentially connected, wherein the lower end of the second tension sensor is provided with a hanging part 13.
The working process and the working principle of the invention are as follows:
s1, hanging a hoisted object on a tension sensor;
s2, communicating an air source with a two-position three-way electromagnetic valve through a reversing valve, wherein at the moment, a normally-open switch is in a disconnected state, the two-position three-way electromagnetic valve is in an initial state, and the reversing valve is communicated with a pneumatic lifting device, and the pneumatic lifting device drives a lifting object to lift;
s3, when the valve rises to a required position, the valve is normally disconnected Guan Geshang, and at the moment, the two-position three-way electromagnetic valve is connected with a power supply access circuit, the direction of the two-position three-way electromagnetic valve is switched, the connection with the reversing valve is disconnected, and the valve is switched to be communicated with the electric proportional valve;
s4, the tension sensor measures the weight of the hoisted object in real time, and sends detected data obtained by detection to the controller;
s5, at the moment, the controller compares the received detection data with a set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s6, if the hoisted object is required to be lifted, manually applying upward force to the hoisted object, and at the moment, comparing the received detection data with a set value by the controller to obtain the following result: the detection data value is smaller than the set value, the controller controls the electric proportional valve to connect the air inlet and the two-position three-way electromagnetic valve to the pneumatic lifting device for pumping air, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from applying upward force, at the moment, the controller compares the received detection data with the set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s7, if the hoisted object is required to descend, selecting one of the following two operation modes:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received detection data with a set value by the controller, and obtaining the following result: the detection data value is greater than the setting value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is exhausted, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received detection data with the setting value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the reversing valve exhaust port is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed into or discharged from the reversing valve, and the pneumatic lifting device maintains pressure.
Preferably, the tension sensor comprises a first tension sensor and a second tension sensor, wherein the first tension sensor is connected to the execution end of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the step S4 specifically includes: the first tension sensor measures the total weight of the object connected below the first tension sensor;
the second tension sensor measures the weight of the hoisted object;
the step S5 specifically comprises the following steps: at the moment, the difference value of the two detection data values is equal to a set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
the step S6 specifically includes: if the hoisted object is required to be lifted, upward force is manually applied to the hoisted object, at the moment, the controller compares the received two detection data values, and the obtained result is as follows: the difference value of the two detection data values is smaller than a set value, the electric proportional valve is controlled to communicate the air inlet with the two-position three-way electromagnetic valve, the air is pumped to the pneumatic lifting device, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from exerting upward force, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
the step S7 specifically includes: if the hoisted object is required to descend, one of the following two operation modes can be selected:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received two detection data values by the controller, and obtaining the following result: the difference value of the two detection data values is larger than a set value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the reversing valve exhaust port is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed into or discharged from the reversing valve, and the pneumatic lifting device maintains pressure.
When vibration occurs, as the detection data detected by the first tension sensor and the second tension sensor are increased or reduced simultaneously, the difference value of the two detection data values is unchanged and still equal to a set value, the electric proportional valve is kept in the middle position, air is not fed and is not discharged, and the pneumatic lifting device maintains pressure;
preferably, the pneumatic lifting device further comprises an operating handle, wherein the executing end of the pneumatic lifting device, the first tension sensor, the operating handle and the second tension sensor are sequentially connected, and the lower end of the second tension sensor is a hanging part;
the step S6 is that the lifting object is manually pulled upwards by applying upward force to the lifting object manually;
the manual downward force applied to the hoisted object in step S7 is manual downward pulling of the operating handle.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (7)
1. A suspension pneumatic lifting device, characterized in that: the device comprises an air source, a power supply access circuit, a reversing valve, an electric proportional valve, a two-position three-way electromagnetic valve, a pneumatic lifting device, a controller and a tension sensor, wherein the reversing valve and the electric proportional valve are respectively connected with the air source and the two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is connected with the pneumatic lifting device, and the power supply access circuit is provided with a control switch for controlling power supply to the electric proportional valve, the two-position three-way electromagnetic valve and the controller;
the tension sensor is arranged on the execution end of the pneumatic lifting device and is used for measuring the weight of the lifting object;
the controller is used for receiving detection data of the tension sensor, comparing the detection data value with a set value, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the detection data value is smaller than the set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the detection data value is larger than the set value;
the tension sensor comprises a first tension sensor and a second tension sensor, wherein the first tension sensor is connected to the execution end of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the first tension sensor and the second tension sensor are respectively connected with the controller, and the first tension sensor is used for measuring the total weight of an object connected below the first tension sensor;
the second tension sensor is used for measuring the weight of the hoisted object;
the controller is used for receiving detection data of the first tension sensor and the second tension sensor, comparing the two detection data values, controlling the electric proportional valve to communicate the air inlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is smaller than a set value, and controlling the electric proportional valve to communicate the air outlet with the two-position three-way electromagnetic valve if the difference value of the two detection data values is larger than the set value;
the pneumatic lifting device, the first tension sensor, the operating handle and the second tension sensor are sequentially connected, and the lower end of the second tension sensor is a hanging part;
the power supply access circuit comprises a main switch connected with a mains supply and a direct current converter for converting alternating current into direct current, the control switch is a normally-off switch, the main switch, the normally-off switch and the direct current converter are sequentially connected, and the electric proportional valve, the two-position three-way electromagnetic valve and the controller are respectively connected with the direct current converter.
2. The suspension pneumatic lifting device of claim 1, wherein: the reversing valve is a manual reversing valve.
3. The suspension pneumatic lifting device of claim 1, wherein: the controller is a PLC controller.
4. A suspension pneumatic lifting device according to claim 3, wherein: the system also comprises a computer, and the computer is connected with the PLC.
5. A suspension pneumatic lifting method employing the suspension pneumatic lifting device of claim 1, characterized in that: the method specifically comprises the following steps:
s1, hanging a hoisted object on a tension sensor;
s2, communicating an air source with a two-position three-way electromagnetic valve through a reversing valve, wherein at the moment, a normally-open switch is in a disconnected state, the two-position three-way electromagnetic valve is in an initial state, and the reversing valve is communicated with a pneumatic lifting device, and the pneumatic lifting device drives a lifting object to lift;
s3, when the valve rises to a required position, the valve is normally disconnected Guan Geshang, and at the moment, the two-position three-way electromagnetic valve is connected with a power supply access circuit, the direction of the two-position three-way electromagnetic valve is switched, the connection with the reversing valve is disconnected, and the valve is switched to be communicated with the electric proportional valve;
s4, the tension sensor measures the weight of the hoisted object in real time, and sends detected data obtained by detection to the controller;
s5, the controller compares the received detection data with a set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s6, if the hoisted object is required to be lifted, manually applying upward force to the hoisted object, and at the moment, comparing the received detection data with a set value by the controller to obtain the following result: the detection data value is smaller than the set value, the controller controls the electric proportional valve to connect the air inlet and the two-position three-way electromagnetic valve to the pneumatic lifting device for pumping air, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from applying upward force, at the moment, the controller compares the received detection data with the set value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
s7, selecting one of the following two operation modes when the hoisted object is required to descend:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received detection data with a set value by the controller, and obtaining the following result: the detection data value is greater than the setting value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is exhausted, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received detection data with the setting value, and the obtained result is that: the detection data value is equal to the set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the reversing valve exhaust port is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed into or discharged from the reversing valve, and the pneumatic lifting device maintains pressure.
6. The suspension pneumatic lifting method of claim 5, wherein: the tension sensor comprises a first tension sensor and a second tension sensor, wherein the first tension sensor is connected to the execution end of the pneumatic lifting device, and the second tension sensor is connected below the first tension sensor;
the step S4 specifically includes: the first tension sensor measures the total weight of the object connected below the first tension sensor;
the second tension sensor measures the weight of the hoisted object;
the step S5 specifically comprises the following steps: at the moment, the difference value of the two detection data values is equal to a set value, the electric proportional valve is kept in the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device is used for maintaining pressure;
the step S6 specifically includes: if the hoisted object is required to be lifted, upward force is manually applied to the hoisted object, at the moment, the controller compares the received two detection data values, and the obtained result is as follows: the difference value of the two detection data values is smaller than a set value, the electric proportional valve is controlled to communicate the air inlet with the two-position three-way electromagnetic valve, the air is pumped to the pneumatic lifting device, the pneumatic lifting device drives the lifting object to rise, when the lifting object rises to a required position, the lifting object is withdrawn from exerting upward force, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
the step S7 specifically includes: if the hoisted object is required to descend, one of the following two operation modes is selected:
operation mode one: manually applying downward force to the hoisted object, at the moment, comparing the received two detection data values by the controller, and obtaining the following result: the difference value of the two detection data values is larger than a set value, the controller controls the electric proportional valve to communicate the exhaust port with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives the lifting object to descend, when the lifting object descends to a required position, the downward force applied to the lifting object is withdrawn, at the moment, the controller compares the received two detection data values, and the obtained result is that: the difference value of the two detection data values is equal to a set value, the electric proportional valve is switched back to the middle position, no air is introduced and no air is exhausted, and the pneumatic lifting device maintains pressure;
and the second operation mode is as follows: the normally-off switch is disconnected, the two-position three-way electromagnetic valve is reset, the connection with the electric proportional valve is disconnected, the switching-over valve is switched to be communicated with the reversing valve, the reversing valve is manually controlled, the exhaust port of the reversing valve is communicated with the two-position three-way electromagnetic valve, gas in the pneumatic lifting device is discharged, the pneumatic lifting device drives a lifting object to descend, when the lifting object descends to a required position, the reversing valve is controlled to be switched to the middle position, air is not fed or exhausted, and the pneumatic lifting device maintains pressure;
when vibration is generated, the detection data detected by the first tension sensor and the second tension sensor are increased or reduced simultaneously, the difference value of the two detection data values is still equal to the set value, the electric proportional valve is kept in the middle position, air is not fed in, air is not discharged, and the pneumatic lifting device maintains pressure.
7. The suspension pneumatic lifting method of claim 6, wherein: the pneumatic lifting device further comprises an operating handle, an executing end of the pneumatic lifting device, a first tension sensor, the operating handle and a second tension sensor are sequentially connected, and the lower end of the second tension sensor is a hanging part;
the step S6 is that the lifting object is manually pulled upwards by applying upward force to the lifting object manually;
the manual downward force applied to the hoisted object in step S7 is manual downward pulling of the operating handle.
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