Precision lifting device and lifting method for large parts

Abstract

The present invention relates to the technical field of mechanical equipment installation, and discloses a precision lifting device for large parts, including a sling and a pull rod. The sling includes a lifting frame and a lifting head. The lifting head is connected to the lifting equipment to achieve the up and down displacement of the sling. There are multiple pull rods, which are arranged below the lifting frame. The multiple pull rods fix multiple positions of large parts. Each pull rod is connected to an electronic weighing instrument, and the electronic weighing instrument measures the tension on the pull rod. The electronic weighing instrument is electrically connected to a monitoring unit, and the monitoring unit displays the tension value of the electronic weighing instrument on each pull rod when the large part is lifted in real time. The present invention also discloses a lifting method for a precision lifting device for large parts. The present invention uses an electronic weighing instrument to monitor the force of each pull rod in real time, and issue an early warning in time to ensure the completion of the lifting process.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment installation, and in particular to a precision hoisting device and a hoisting method for large parts. Background Art

[0002] According to the current general manufacturing method, for the lifting of large parts, only hoists and pull rods are generally used without other auxiliary devices. When the matching diameter of the parts is large and the matching clearance is small, if the parts tilt and cannot be monitored in time, there will be a risk of jamming, causing major quality accidents.

[0003] See attached Figure 1 Taking the heavy reflector assembly of nuclear power equipment hoisted into the hanging basket cylinder as an example, the hoist 1 lifts the large part 3, namely the heavy reflector assembly, through the pull rod 2 and keeps the large part 3 balanced.

[0004] See attached Figure 2 After the large part 3 is lifted to the top of the hanging basket cylinder 4, it is slowly lowered until it fits into the hanging basket cylinder 4.

[0005] Since the diameter of the heavy reflector is very large, reaching more than Φ4000mm, the gap between the hanging basket cylinder and the heavy reflector is only 3mm. Any uneven force during lifting will cause jamming and lead to major accidents. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems and to provide a precision lifting device and lifting method for large parts. Through an electronic weighing instrument, the stress conditions of each pull rod are monitored in real time, and early warnings are given in time to ensure the completion of the lifting process.

[0007] The technical solution adopted by the present invention is:

[0008] A precision lifting device for large parts, characterized in that it includes a lifting tool and a pull rod. The lifting tool includes a lifting frame and a lifting head. The lifting head is connected to the lifting equipment to realize the up and down displacement of the lifting tool. There are multiple pull rods arranged under the lifting frame. The multiple pull rods fix multiple positions of large parts. Each pull rod is connected to an electronic weighing scale. The electronic weighing scale measures the tension applied to the pull rod. The electronic weighing scale is electrically connected to a monitoring unit. The monitoring unit displays in real time the tension value of the electronic weighing scale on each pull rod when lifting large parts.

[0009] Furthermore, the pull rod includes an upper pull rod and a lower pull rod, the upper pull rod is used to be fixed on the lifting frame, the lower pull rod is used to fix large parts, the upper connecting shaft is connected to the lower end of the upper pull rod, and the lower connecting shaft is connected to the upper end of the lower pull rod, and the electronic weighing instrument is installed between the upper connecting shaft and the lower connecting shaft.

[0010] Furthermore, the upper connecting shaft is connected to the upper pull rod by threads, the lower connecting shaft is connected to the lower pull rod by threads, an upper connecting groove is opened at the lower end of the upper connecting rod, and a lower connecting groove is opened at the upper end of the lower connecting rod. The upper end of the electronic weighing scale is inserted into the upper connecting groove and connected by an upper connecting pin, and the lower end of the electronic weighing scale is inserted into the lower connecting groove and connected by a lower connecting pin.

[0011] Furthermore, the number of the tie rods is n, n is 3 to 6, the weight of the large part is assumed to be W, the carrying capacity of the sling is greater than 1.5W, and the rated load of each tie rod is greater than 1.25W / n.

[0012] Furthermore, the lifting frame is a square surrounded by four cross beams, and there are four pull rods, which are fixed in the middle of the four cross beams through ground locking devices. The lower ends of the four pull rods are fixed on the large parts, and the positions of the four pull rods make the center of gravity of the large parts located in the center of the lifting frame.

[0013] Furthermore, the monitoring unit includes an alarm module. When the change value of the electronic weighing instrument is greater than a predetermined safety value, the monitoring unit displays an overload and the alarm module sounds an alarm.

[0014] Furthermore, the large part is a barrel-shaped part with a size of Φ4200 to Φ3500mm, a height of ≤5000mm, a maximum weight of 100 tons, a fitting clearance between the large part and the matching barrel body for hoisting of ≥3mm, and the predetermined safety value is 250KG.

[0015] Furthermore, the electronic weighing instrument has a rated load of 30T, a sensitivity of 2.0±0.1%MV / V, and a minimum unit of 10kg;

[0016] A method for hoisting the above-mentioned large-scale parts precision hoisting device is characterized by comprising the following steps:

[0017] (1) Lift the large parts, adjust the lifting equipment, and use the electronic weighing scale on the pull rod to make the displayed values ​​consistent and the deviation less than the predetermined deviation value;

[0018] (2) Move the lifting device to place the large parts in the installation position;

[0019] (3) The lifting device is moved downward to lift the large parts into the installation position, and the weight change value of each electronic weighing instrument is monitored by the monitoring unit;

[0020] (4) When the weight change value of an electronic weighing instrument is greater than the preset safety value, stop the lifting immediately, correct the installation parameters or re-lift until the lifting is completed.

[0021] Furthermore, the large part has a maximum weight of 100 tons, the predetermined deviation value is 100 kg, and the predetermined safety value is 250 kg.

[0022] The beneficial effects of the present invention are:

[0023] By installing an electronic weighing instrument on the pull rod, the lifting process can be monitored in real time, and possible accidents can be predicted through alarms to avoid accidents and ensure product and personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the existing lifting method for lifting large parts;

[0025] Attached Figure 2 It is a schematic diagram of the existing lifting method for lifting large parts and fitting them into the hanging basket cylinder;

[0026] Attached Figure 3 It is a schematic diagram of the large-scale parts in the present invention being hoisted and fitted into the cylinder of the hanging basket;

[0027] Attached Figure 4 It is a schematic diagram of the installation position of the electronic weighing instrument and the pull rod.

[0028] The reference numerals in the accompanying drawings are:

[0029] 1. Lifting device; 2. Pull rod;

[0030] 3. Large parts; 4. Basket cylinder;

[0031] 5. Lifting frame; 6. Lifting head;

[0032] 7. Electronic weighing instrument; 8. Pull-up rod;

[0033] 9. Pull-down rod; 10. Locking device;

[0034] 11. Upper connecting shaft; 12. Lower connecting shaft;

[0035] 13. Upper connecting groove; 14. Lower connecting groove;

[0036] 15. Upper connecting pin; 16. Lower connecting pin. DETAILED DESCRIPTION

[0037] The specific implementation methods of the precision lifting device and lifting method for large parts of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] See attached Figure 3The precision lifting device for large parts includes a lifting device 1 and a tie rod 2. The lifting device 1 includes a lifting frame 5 and a lifting head 6. The lifting head 6 is connected to the lifting device to realize the up and down displacement of the lifting device 1. There are multiple tie rods 2, which are arranged under the lifting frame 5. The multiple tie rods 2 fix multiple positions of the large parts 3. Each tie rod 2 is connected to an electronic weighing instrument 7. The electronic weighing instrument 7 measures the tension on the tie rod 2. The electronic weighing instrument 7 is electrically connected to a monitoring unit. The monitoring unit displays in real time the tension value of the electronic weighing instrument 7 on each tie rod 2 when the large parts 3 are lifted. The monitoring unit includes an alarm module. When the change value of the electronic weighing instrument 7 is greater than the predetermined safety value, the monitoring unit displays an overload, and the alarm module alarms.

[0039] See attached Figure 4 The pull rod 2 includes an upper pull rod 8 and a lower pull rod 9. The upper pull rod 8 is fixed to the lifting frame 5 through a locking device 10. The lower pull rod 9 is used to fix the large parts 3. The upper connecting shaft 11 is connected to the lower end of the upper pull rod 8, and the lower connecting shaft 12 is connected to the upper end of the lower pull rod 9. The electronic weighing instrument 7 is installed between the upper connecting shaft 11 and the lower connecting shaft 12. The upper connecting shaft 11 is connected to the upper pull rod 8 by threading, and the lower connecting shaft 12 is connected to the lower pull rod 9 by threading. The lower end of the upper connecting shaft 11 is provided with an upper connecting groove 13, and the upper end of the lower connecting shaft 12 is provided with a lower connecting groove 14. The upper end of the electronic weighing instrument 7 is inserted into the upper connecting groove 13 and connected by an upper connecting pin 15. The lower end of the electronic weighing instrument 7 is inserted into the lower connecting groove 14 and connected by a lower connecting pin 16. The end openings of the upper connecting pin 15 and the lower connecting pin 16 are provided with locking pins to prevent the connecting pins from falling off.

[0040] Take the heavy reflector assembly in nuclear power equipment as an example. The lifting frame is a square surrounded by four beams. There are four tie rods, which are fixed in the middle of the four beams through the ground locking device. The lower ends of the four tie rods are fixed on the large parts. The positions of the four tie rods make the center of gravity of the large parts located in the center of the lifting frame. Electronic weighing instruments are connected to the tie rods in four directions. The rated load of a single electronic weighing instrument is 30T, the sensitivity is: 2.0±0.1%MV / V, and the minimum unit of the display is 10kg.

[0041] After lifting the heavy reflector, adjust the length of the lifting screw to make the electronic weighing instrument display values ​​consistent, with a maximum deviation of no more than 100kg. After the heavy reflector assembly is hoisted into the hanging basket cylinder, observe the display of the weighing instrument during the hoisting process. When the weighing change value is ≥250kg, the display system will display overload and buzzer alarm, indicating that the center of gravity is skewed and there is a risk of jamming, and the data will be recorded and printed. When an alarm occurs, the lifting operation should be stopped immediately, and the direction of the alarm should be analyzed from the displayed data to determine the next operation.

[0042] The hoisted workpiece of the present invention is a workpiece with a regular shape, and the size of the hoisted workpiece is Φ4200~Φ3500, the height is ≤5000mm, the maximum weight is 100 tons, and the matching clearance is ≥3mm. The rated load of the electronic weighing instrument is 30T, the sensitivity is 2.0±0.1%MV / V, and the minimum unit is 10kg; when the size specification and weight are greater than the equipment capacity of the present invention, it is only necessary to design the corresponding process equipment and equip the appropriate electronic weighing instrument to realize the hoisting of workpieces of different specifications.

[0043] When the number of tie rods is not four, assuming the number of tie rods is n, n is 3 to 6, and the weight of the large parts is W, the load-bearing capacity of the sling is required to be greater than 1.5W, and the rated load of each tie rod is greater than 1.25W / n.

[0044] See the attached Figure 3 The hoisting method using a precision hoisting device includes the following steps:

[0045] (1) Lift the large parts, adjust the lifting equipment, and use the electronic weighing scale on the pull rod to make the displayed values ​​consistent and the deviation less than the predetermined deviation value;

[0046] (2) Move the lifting device to place the large parts in the installation position;

[0047] (3) The lifting device is moved downward to lift the large parts into the installation position, and the weight change value of each electronic weighing instrument is monitored by the monitoring unit;

[0048] (4) When the weight change value of an electronic weighing instrument is greater than the preset safety value, stop the lifting immediately, correct the installation parameters or re-lift until the lifting is completed.

[0049] The specific requirements for lifting are as follows:

[0050] Before operation, select the lifting device according to the weight of the workpiece to be hoisted. The load capacity of the lifting device must be at least 1.5 times the weight of the workpiece; the electronic weighing instrument must be calibrated, and the rated load must be at least 1.25 times the weight of the workpiece / 4. Use the connecting shaft to assemble the electronic weighing instrument and the pull rod, and use the pin for positioning; connect the electronic weighing instrument to the lifting device and fix it with a locking device. Connect the pull rod to the workpiece to be hoisted, that is, the large part, and check the reliability of the connection; connect the electronic weighing instrument to the display and check the display function;

[0051] When lifting the workpiece, observe the load values ​​of the four electronic weighing instruments. When the difference is greater than 100kg, adjust the length of the pull rod until the load value difference displayed by the four electronic weighing instruments is ≤100kg, and set the value at this time as the initial value;

[0052] When the workpiece to be hoisted is hoisted into the matching workpiece, i.e., the hanging basket cylinder in the figure, observe the change between the electronic weighing instrument reading and the initial value. When the change value is ≥250kg, the display system will display overload and buzzer alarm, indicating that the center of gravity is skewed and there is a risk of jamming, and the data will be recorded and printed. When an alarm occurs, the hoisting operation should be stopped immediately, and the direction of the alarm should be analyzed from the displayed data to determine the next operation.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A precision lifting device for large parts, characterized by: It includes a sling and a pull rod. The sling includes a lifting frame and a lifting head. The lifting head is connected to the lifting equipment to achieve the up and down displacement of the sling. There are multiple pull rods arranged under the lifting frame. The multiple pull rods fix multiple positions of large parts. Each pull rod is connected to an electronic weighing instrument. The electronic weighing instrument measures the tension on the pull rod. The electronic weighing instrument is electrically connected to a monitoring unit. The monitoring unit displays the tension value of the electronic weighing instruments on each pull rod when the large parts are lifted in real time. The pull rod comprises an upper pull rod and a lower pull rod, the upper pull rod is used to be fixed on the lifting frame, the lower pull rod is used to fix large parts, the upper connecting shaft is connected to the lower end of the upper pull rod, the lower connecting shaft is connected to the upper end of the lower pull rod, and the electronic weighing instrument is installed between the upper connecting shaft and the lower connecting shaft; The upper connecting shaft is connected to the upper pull rod by threads, the lower connecting shaft is connected to the lower pull rod by threads, the lower end of the upper connecting shaft is provided with an upper connecting groove, the upper end of the lower connecting shaft is provided with a lower connecting groove, the upper end of the electronic weighing instrument is inserted into the upper connecting groove and connected by an upper connecting pin, the lower end of the electronic weighing instrument is inserted into the lower connecting groove and connected by a lower connecting pin; The lifting frame is a square surrounded by four cross beams. There are four pull rods, which are fixed in the middle of the four cross beams by locking devices. The lower ends of the four pull rods are fixed on the large parts. The positions of the four pull rods make the center of gravity of the large parts located in the center of the lifting frame.

2. The precision lifting device for large parts according to claim 1 is characterized in that: The number of the tie rods is n, where n is 3 to 6. Assuming the weight of the large part is W, the load-bearing capacity of the sling is greater than 1.5W, and the rated load of each tie rod is greater than 1.25W / n.

3. The precision lifting device for large parts according to any one of claims 1 to 2, characterized in that: The monitoring unit includes an alarm module. When the change value of the electronic weighing instrument is greater than a predetermined safety value, the monitoring unit displays an overload and the alarm module sounds an alarm.

4. The precision lifting device for large parts according to claim 3 is characterized in that: The large parts are barrel-shaped parts with dimensions ranging from Φ4200 to Φ3500mm, a height of ≤5000mm, a maximum weight of 100 tons, a matching clearance between the large parts and the matching barrel body for hoisting ≥3mm, and the predetermined safety value is 250KG.

5. The precision lifting device for large parts according to claim 4 is characterized in that: The electronic weighing instrument has a rated load of 30T, a sensitivity of 2.0±0.1%MV / V, and a minimum unit of 10kg.

6. A method for hoisting a large-scale component precision hoisting device according to any one of claims 1 to 5, characterized in that: The steps include: (1) Lift the large parts, adjust the lifting equipment, and use the electronic weighing scale on the pull rod to make the displayed values ​​consistent and the deviation less than the predetermined deviation value; (2) Move the lifting device to place the large parts in the installation position; (3) The lifting device is moved downward to lift the large parts into the installation position, and the weight change value of each electronic weighing instrument is monitored by the monitoring unit; (4) When the weight change value of an electronic weighing instrument is greater than the preset safety value, stop the lifting immediately, correct the installation parameters or re-lift until the lifting is completed.

7. The hoisting method according to claim 6, characterized in that: The large part has a maximum weight of 100 tons, the predetermined deviation value is 100 kg, and the predetermined safety value is 250 kg.

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