CN107311060B - Mechanical whole-course weight-limiting power-off protection device and jack applied by same - Google Patents
Mechanical whole-course weight-limiting power-off protection device and jack applied by same Download PDFInfo
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- CN107311060B CN107311060B CN201710757127.1A CN201710757127A CN107311060B CN 107311060 B CN107311060 B CN 107311060B CN 201710757127 A CN201710757127 A CN 201710757127A CN 107311060 B CN107311060 B CN 107311060B
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- 230000001681 protective effect Effects 0.000 claims abstract description 35
- 238000004804 winding Methods 0.000 claims description 21
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- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000001174 ascending effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
- B66D1/56—Adaptations of limit switches
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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
- B66C13/18—Control systems or devices
- B66C13/50—Applications of limit circuits or of limit-switch arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
- B66D1/58—Safety gear responsive to excess of load
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Jib Cranes (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention discloses a mechanical whole-course weight-limiting power-off protection device, which comprises a main rod, wherein the front end of the main rod is inserted with a small lever for hoisting, the rear end of the small lever is connected to the main rod through a connecting bolt, a protective sleeve is arranged below the small lever, the protective sleeve is inserted on the main rod and fixedly connected with the main rod, the upper end of the protective sleeve keeps a distance from the small lever, the lower end of the protective sleeve is fixedly connected with a nut, a weight-limiting spring is arranged in the protective sleeve, an adjusting bolt is sleeved in the nut, one end of the weight-limiting spring is abutted against the lower surface of the small lever, and the other end of the weight-limiting spring is abutted against the top of a screw rod of the adjusting bolt; the main rod is provided with a travel switch, and a rotating arm of the travel switch is connected to the front end of the small lever. The invention has the advantages of adjusting the whole-process hoisting weight of the goods, and carrying out mechanical overload protection and electric control overload protection on the motor.
Description
Technical Field
The invention belongs to the field of outdoor hoisting of an ultra-high altitude, and particularly relates to a mechanical whole-course weight-limiting power-off protection device and a crane applied by the same.
Background
Along with the faster and faster modernization development of our country, the urban construction high-rise buildings are more and more, and the buildings with twenty-three floors in the city are seen everywhere. The most difficult work such as outdoor high-altitude operation such as decoration industry, air conditioner installation dismantlement, anti-theft net push wave installation now is hoist and mount aloft, and outdoor superelevation work hoist and mount safe risk is big, and the field of vision is unclear. The steel wire is broken in the hoisting process due to the fact that objects outside the room are easily caught in the process of hoisting twenty-thirty buildings and the super-high altitude is nearly hundred meters, and the annual accidents are frequently caused.
In the high altitude hoist and mount industry, we find patent number 201621330936.1, the utility model name: a simple jack is disclosed, a balance weight rod (7) which can be drawn out from an operating end is arranged in a rod body of a main jack rod (4) of the simple jack, two ends of the balance weight rod (7) are provided with limiting pieces (701), a limiting rod (401) is further arranged in the operating end, and the position of the limiting rod (401) is higher than that of the balance weight rod (7) and lower than the top edge of the limiting pieces (701); after the weight rod (7) is drawn out, the limiting piece (701) at the end, which is not drawn out, of the weight rod (7) is clamped by the limiting rod (401). The utility model discloses a small, portable, work efficiency is high, use manpower sparingly, simple to use and be applicable to high-rise building. However, in the process of adopting electric drive to lift, if the goods are jammed midway or the goods are overweight, the jack is easy to cause motor overload; meanwhile, the tail part of the auxiliary rod of the jack is only provided with one limiting piece, the balance of the whole device cannot be kept, the gravity center of the driving device is arranged above the rod when the jack is used, and the gravity center falls down after the fixed point of the front supporting piece is moved, so that hidden danger exists. At present, no device for monitoring and protecting the whole hoisting overload is available in the market.
Disclosure of Invention
The invention aims to solve the technical problems and provides a mechanical whole-course weight-limiting power-off protection device which can adjust the whole-course lifting weight of goods and carry out double safety of mechanical overload protection and electric overload control protection on a motor and a crane applied by the device.
In order to realize the purpose, the technical scheme of the invention is as follows:
a mechanical whole-course weight-limiting power-off protection device comprises a main rod, wherein a small lever for hoisting is inserted into the front end of the main rod, the rear end of the small lever is connected onto the main rod through a connecting bolt, a protective sleeve is arranged below the small lever, the protective sleeve is inserted on the main rod and fixedly connected with the main rod, the upper end of the protective sleeve keeps a distance with the small lever, the lower end of the protective sleeve is fixedly connected with a nut, a weight-limiting spring is placed in the protective sleeve, an adjusting bolt is sleeved in the nut, one end of the weight-limiting spring is abutted to the lower surface of the small lever, and the other end of the weight-limiting spring is abutted to the top of a screw of the adjusting bolt; the lifting device is characterized in that a travel switch is arranged on the main rod, a rotating arm of the travel switch is connected to the front end of the small lever, and the travel switch is electrically connected with a driving device of the lifting device.
As a further technical scheme, the weight limiting spring abuts at a position 1/3-1/2 away from the front end of the small lever.
As a further technical scheme, the distance between the upper end of the protective sleeve and the small lever is 3-15mm.
A jack comprises the mechanical whole-course power-off and power-limiting protection device, wherein a guide device is arranged at the front end of a small lever of the mechanical whole-course power-off and power-limiting protection device, and a lifting hook is arranged below the guide device; a fixing frame is arranged at the rear end of a main rod of the mechanical whole-course weight-limiting power-off protection device, a driving device is arranged on the fixing frame, the lifting hook is connected with one end of a lifting rope, the other end of the lifting rope bypasses a guide device and is connected with the driving device, a supporting device is arranged below the main rod, and the length of the supporting device from the front end of the main rod accounts for 1/(3-4) of the length of the main rod; and a travel switch of the mechanical full-range repeat-limiting power-off protection device is connected with a lifting driving part of the driving device in series.
As a further technical scheme, the driving device comprises a winding drum, a motor and a motor remote control switch, the motor remote control switch is electrically connected with the motor, the motor and the winding drum are both installed on the fixing frame, the other end of the lifting rope bypasses the guide device to be connected with the winding drum, the winding drum is connected with the power output of the motor, and the travel switch is connected with the lifting key of the motor remote control switch in series.
As a further technical scheme, a fan is further arranged above the motor and is installed on the fixing frame.
As a further technical scheme, a current display and a voltage display are further arranged on the fixing frame and are electrically connected with the motor.
As a further technical scheme, the bottom of the fixing frame is provided with a travelling wheel.
As a further technical scheme, an auxiliary rod which can be drawn out from the rear end of the main rod is arranged in the main rod, the auxiliary rod comprises an auxiliary rod body, the front end of the auxiliary rod body is arranged in the main rod, an auxiliary rod stop piece is arranged at the front end of the auxiliary rod body, and a stop rod for stopping the auxiliary rod stop piece is arranged at the rear end of the main rod; the rear end of the auxiliary rod body is arranged outside the main rod, and an auxiliary rod balancing rod used for keeping the left and right balance of the driving device is arranged at the rear end of the auxiliary rod body.
As a further technical scheme, the supporting device consists of two supporting sheets which are bent at right angles, the outer surface of one supporting sheet is connected with the lower surface of the main rod, and the distance between the two supporting sheets is 10-12cm; the guiding device is a guide wheel.
In the present invention, the total length of the main pole is optimally 1.5-2.5m. The length of the counterweight rod is optimally 1.5-2.5m. The length of the supporting device from the front end of the main rod is 1/(3-4) of the length of the main rod, and the stress is minimum 1; the former is equivalent to adding 10kg of weight and can add 30kg of weight, and the latter is equivalent to adding 10kg of weight and can add 80kg of weight.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can adjust the lifting weight of the goods.
The mechanical whole-course weight-limiting power-off protection device adopts the adjusting bolt to move up and down to adjust the compression amount of the weight-limiting spring, the small lever drives an end travel switch (a limit switch) to act through the compression displacement of the spring by a certain angle through the change of the compression amount, if the adjusting bolt rotates downwards, the initial compression amount of the weight-limiting spring is small (namely, the weight-limiting spring is loose), and the bearable hoisting weight of the small lever is small; if the adjusting bolt rotates upwards, the initial compression amount of the weight limiting spring is large (namely, the weight limiting spring is tighter), and the lifting weight which can be borne by the small lever is large.
2. The invention can carry out overload protection on the motor.
The mechanical whole-course weight-limiting power-off protection device can set the initial compression amount of the weight-limiting spring according to the lifting capacity, and supposing that when the lifting capacity of the crane is set to be 100KG and the actual lifting capacity is 50KG, the original state of the weight-limiting spring is enough to support a small lever for lifting in the range. When in the hoisting process. The lifting capacity is increased by more than or equal to 100KG due to the fact that a lifted object is hooked by a foreign object due to collision, the weight limiting spring is deformed and compressed, the front end of the small lever can be pulled down to trigger the travel switch, the motor is lifted and powered off, then the motor can only be lowered to remove lifting limitation, and the whole overload protection function is achieved. The jack can also know the lifting condition by observing the current, voltage and power change of the motor, and can manually carry out power-off protection on the motor. Compared with the traditional crane, the mechanical whole-course weight-limiting power-off protection device has the function of whole-course safety overload protection, and solves the defect that the overload protection is only carried out when the traditional crane reaches the upper limit. The whole hoisting process is safer and more efficient. The application range is wide.
3. The jack has the advantages of simple structure, convenience in use and higher safety.
The jack adopts a lever principle, takes the supporting device as a fulcrum, and installs the driving device as a first counterweight on the fixed frame, thereby achieving two purposes, namely realizing the hoisting operation of hoisted goods, realizing the counterweight and simplifying the structure. Meanwhile, in order to hoist cargoes with larger weight, the invention is additionally provided with the counterweight rod in the main rod, and when the cargoes are overweight, the counterweight rod can be drawn out from the main hoisting rod to be used as a second counterweight. According to the invention, the auxiliary rod balancing rods for keeping the left and right balance of the integral device are arranged at the rear ends of the auxiliary rod bodies, and when the center of gravity is changed due to moving the fixed point of the front support piece, the balance of the integral device can be kept by the auxiliary rod balancing rods without toppling, so that the safety of the hoisting process is ensured.
4. The invention has high working efficiency.
The jack adopts the lever principle, lifts the goods which are more than 3 times of the dead weight with the dead weight of 20-30kg, is beneficial to being carried into the elevator of the high-rise building compared with other jacks, only needs less counter weights and realizes higher lifting working efficiency.
5. The invention has reasonable design and distribution, small occupied area and convenient carrying.
The jack takes the supporting device as a fulcrum, the counterweight rod is accommodated in the main hoisting rod, so that the counterweight is more reasonably increased, the occupied area of the rod-shaped structure is smaller, the rod-shaped structure is easy to enter an elevator, and the walking wheels are arranged below the fixed frame, so that the jack is convenient to move and carry.
6. The invention is more suitable for hoisting high-rise buildings.
The support device and the balance weight of the jack do not need to be arranged on the same plane, the jack is directly clamped at the window edge by the support device, the driving device is placed on the ground, the support device consists of two support sheets bent at right angles, and can be clamped at the outer wall body or the inner wall body of the window edge, or the window edge is directly clamped by two stop sheets, so that the jack can be flexibly adjusted in actual operation and can better cope with various hoisting conditions.
7. The invention saves manpower.
Because many high-altitude hoists are pulled and installed by manpower at present, the danger is large, the manpower cost is high, the labor intensity of related personnel is large, and by using the invention, the hoisting operation can be easily finished by only two to three persons. Not only ensures safety, but also reduces labor intensity.
Drawings
FIG. 1 is a schematic structural diagram of a mechanical full-range power-limiting and power-down protection device according to the present invention;
FIG. 2 is a schematic diagram of the internal structure of the mechanical full-range power-down protection device according to the present invention;
FIG. 3 is a schematic front view of the jack of the present invention;
FIG. 4 is a schematic view of the construction of the rear face of the jack of the present invention;
FIG. 5 is an enlarged front end of the jack according to the present invention;
FIG. 6 is a schematic view of the construction of the sub-rod of the present invention;
fig. 7 is a top view of the secondary rod of fig. 6.
Reference numerals: 1-small lever, 2-travel switch, 3-main rod, 31-connecting bolt, 32-stop rod, 4-nut, 5-adjusting bolt, 6-protective sleeve, 7-weight limiting spring, 8-supporting device, 9-lifting hook, 10-guiding device, 11-lifting rope, 12-driving device, 121-fan, 122-voltage display, 123-current display, 124-motor remote control switch, 125-fixing frame, 126-motor, 127-winding drum, 57-motor, 13-travelling wheel, 14-auxiliary rod, 141-auxiliary rod balancing rod, 142-auxiliary rod body, 143-auxiliary rod stop piece.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited to the scope of the examples.
Example 1:
as shown in fig. 1-2, a mechanical whole-course weight-limiting power-off protection device comprises a main rod 3, a small lever 1 for hoisting is inserted into the front end of the main rod 3, the rear end of the small lever 1 is connected to the main rod 3 through a connecting bolt 31, a protective sleeve 6 is arranged below the small lever 1, the protective sleeve 6 is inserted into the main rod 3 and fixedly connected with the main rod 3, the upper end of the protective sleeve 6 keeps a distance with the small lever 1, the lower end of the protective sleeve is fixedly connected with a nut 4, a weight-limiting spring 7 is placed in the protective sleeve 6, an adjusting bolt 5 is sleeved in the nut 4, one end of the weight-limiting spring 7 is abutted against the lower surface of the small lever 1, and the other end of the weight-limiting spring is abutted against the top of a screw rod of the adjusting bolt 5; the main rod 3 is provided with a travel switch 2, and a rotating arm of the travel switch 2 is connected with the front end of the small lever 1. The weight limiting spring 7 is abutted at a position 1/3 of the front end of the small lever 1. The distance between the upper end of the protective sleeve 6 and the small lever 1 is 3mm.
Example 2:
as shown in fig. 1-2, a mechanical whole-course weight-limiting power-off protection device comprises a main rod 3, a small lever 1 for hoisting is inserted into the front end of the main rod 3, the rear end of the small lever 1 is connected to the main rod 3 through a connecting bolt 31, a protective sleeve 6 is arranged below the small lever 1, the protective sleeve 6 is inserted into the main rod 3 and fixedly connected with the main rod 3, the upper end of the protective sleeve 6 keeps a distance with the small lever 1, the lower end of the protective sleeve is fixedly connected with a nut 4, a weight-limiting spring 7 is placed in the protective sleeve 6, an adjusting bolt 5 is sleeved in the nut 4, one end of the weight-limiting spring 7 is abutted against the lower surface of the small lever 1, and the other end of the weight-limiting spring is abutted against the top of a screw rod of the adjusting bolt 5; the main rod 3 is provided with a travel switch 2, and a rotating arm of the travel switch 2 is connected with the front end of the small lever 1. The weight limiting spring 7 is abutted at a position 1/2.5 away from the front end of the small lever 1. The distance between the upper end of the protective sleeve 6 and the small lever 1 is 10mm.
Example 3:
as shown in fig. 1-2, a mechanical whole-course weight-limiting power-off protection device comprises a main rod 3, a small lever 1 for hoisting is inserted into the front end of the main rod 3, the rear end of the small lever 1 is connected to the main rod 3 through a connecting bolt 31, a protective sleeve 6 is arranged below the small lever 1, the protective sleeve 6 is inserted into the main rod 3 and fixedly connected with the main rod 3, the upper end of the protective sleeve 6 keeps a distance from the small lever 1, the lower end of the protective sleeve is fixedly connected with a nut 4, a weight-limiting spring 7 is arranged in the protective sleeve 6, an adjusting bolt 5 is sleeved in the nut 4, one end of the weight-limiting spring 7 is abutted to the lower surface of the small lever 1, and the other end of the weight-limiting spring is abutted to the top of a screw of the adjusting bolt 5; the main rod 3 is provided with a travel switch 2, and a rotating arm of the travel switch 2 is connected with the front end of the small lever 1. The weight limiting spring 7 is abutted at a position 1/2 of the distance from the front end of the small lever 1. The distance between the upper end of the protective sleeve 6 and the small lever 1 is 15mm.
Example 4:
as shown in fig. 3-7, a jack comprises a mechanical whole-stroke power-limiting and power-down protection device of embodiment 1, wherein a guide device 10 is arranged at the front end of a small lever 1 of the mechanical whole-stroke power-limiting and power-down protection device, and a lifting hook 9 is arranged below the guide device 10; a fixing frame 125 is arranged at the rear end of a main rod 3 of the mechanical full-range weight-limiting power-off protection device, a driving device 12 is arranged on the fixing frame 125, a lifting hook 9 is connected with one end of a lifting rope 11, the other end of the lifting rope 11 bypasses a guide device 10 and is connected with the driving device 12, a supporting device 8 is arranged below the main rod 3, and the length of the supporting device 8 from the front end of the main rod 3 accounts for 1/3 of the length of the main rod 3; the travel switch 2 of the mechanical full-load-limiting power-off protection device is connected in series with the lifting drive part of the drive device 12. The driving device 12 comprises a winding drum 127, a motor 126 and a motor remote control switch 124, the motor remote control switch 124 is electrically connected with the motor 126, the motor 126 and the winding drum 127 are both arranged on the fixed frame 125, the other end of the lifting rope 11 bypasses the guiding device 10 and is connected with the winding drum 127, the winding drum 127 is connected with the power output of the motor 126, and the travel switch 2 is connected with the ascending key of the motor remote control switch 124 in series. The fan 121 is further disposed above the motor 126, and the fan 121 is mounted on the fixing frame 125. The fixing frame 125 is further provided with a current display 123 and a voltage display 122, and the current display 123 and the voltage display 122 are electrically connected with the motor 126. The bottom of the fixing frame 125 is provided with a traveling wheel 13. The auxiliary rod 14 which can be drawn out from the rear end of the main rod 3 is arranged in the main rod 3, the auxiliary rod 14 comprises an auxiliary rod body 142, the front end of the auxiliary rod body 142 is arranged in the main rod 3, an auxiliary rod stopping piece 143 is arranged at the front end of the auxiliary rod body 142, and a stop rod 32 for stopping the auxiliary rod stopping piece 143 is arranged at the rear end of the main rod 3; the rear end of the sub-lever body 142 is disposed outside the main lever 3, and a sub-lever balancing lever 141 for maintaining the left and right balance of the driving device 12 is disposed at the rear end of the sub-lever body 142. The supporting device 8 consists of two supporting sheets which are bent at right angles, one outer surface of each supporting sheet is connected with the lower surface of the main rod 3, and the distance between the two supporting sheets is 10cm; the guide 10 is a guide wheel.
Example 5:
as shown in fig. 3 to 7, a jack comprises a mechanical whole-stroke power-down and power-down limiting protection device of embodiment 2, wherein a guide device 10 is arranged at the front end of a small lever 1 of the mechanical whole-stroke power-down and power-down limiting protection device, and a lifting hook 9 is arranged below the guide device 10; a fixing frame 125 is arranged at the rear end of a main rod 3 of the mechanical full-range weight-limiting power-off protection device, a driving device 12 is arranged on the fixing frame 125, a lifting hook 9 is connected with one end of a lifting rope 11, the other end of the lifting rope 11 bypasses a guide device 10 and is connected with the driving device 12, a supporting device 8 is arranged below the main rod 3, and the length of the supporting device 8 from the front end of the main rod 3 accounts for 1/4 of the length of the main rod 3; the travel switch 2 of the mechanical full-range repeat-limiting power-off protection device is connected in series with the lifting driving part of the driving device 12. The driving device 12 comprises a winding drum 127, a motor 126 and a motor remote control switch 124, the motor remote control switch 124 is electrically connected with the motor 126, the motor 126 and the winding drum 127 are both arranged on a fixed frame 125, the other end of the lifting rope 11 bypasses the guiding device 10 and is connected with the winding drum 127, the winding drum 127 is connected with the power output of the motor 126, and the travel switch 2 is connected with the ascending key of the motor remote control switch 124 in series. A fan 121 is further disposed above the motor 126, and the fan 121 is mounted on the fixing frame 125. The fixing frame 125 is further provided with a current display 123 and a voltage display 122, and the current display 123 and the voltage display 122 are electrically connected with the motor 126. The bottom of the fixing frame 125 is provided with a walking wheel 13. The main rod 3 is internally provided with an auxiliary rod 14 which can be drawn out from the rear end of the main rod 3, the auxiliary rod 14 comprises an auxiliary rod body 142, the front end of the auxiliary rod body 142 is arranged in the main rod 3, the front end of the auxiliary rod body 142 is provided with an auxiliary rod stop sheet 143, and the rear end of the main rod 3 is provided with a stop rod 32 for stopping the auxiliary rod stop sheet 143; the rear end of the sub-lever body 142 is disposed outside the main lever 3, and a sub-lever balancing lever 141 for maintaining the left and right balance of the driving device 12 is disposed at the rear end of the sub-lever body 142. The supporting device 8 consists of two supporting pieces which are bent at right angles, the outer surface of one supporting piece is connected with the lower surface of the main rod 3, and the distance between the two supporting pieces is 11cm; the guide 10 is a guide wheel.
Example 6:
as shown in fig. 3-7, a jack comprises a mechanical full-stroke power-off and power-limiting protection device of embodiment 3, wherein a guide device 10 is arranged at the front end of a small lever 1 of the mechanical full-stroke power-off and power-limiting protection device, and a hook 9 is arranged below the guide device 10; a fixing frame 125 is arranged at the rear end of a main rod 3 of the mechanical full-range weight-limiting power-off protection device, a driving device 12 is arranged on the fixing frame 125, a lifting hook 9 is connected with one end of a lifting rope 11, the other end of the lifting rope 11 bypasses a guide device 10 and is connected with the driving device 12, a supporting device 8 is arranged below the main rod 3, and the length of the supporting device 8 from the front end of the main rod 3 accounts for 1/4 of the length of the main rod 3; the travel switch 2 of the mechanical full-range repeat-limiting power-off protection device is connected in series with the lifting driving part of the driving device 12. The driving device 12 comprises a winding drum 127, a motor 126 and a motor remote control switch 124, the motor remote control switch 124 is electrically connected with the motor 126, the motor 126 and the winding drum 127 are both arranged on the fixed frame 125, the other end of the lifting rope 11 bypasses the guiding device 10 and is connected with the winding drum 127, the winding drum 127 is connected with the power output of the motor 126, and the travel switch 2 is connected with the ascending key of the motor remote control switch 124 in series. A fan 121 is further disposed above the motor 126, and the fan 121 is mounted on the fixing frame 125. The fixing frame 125 is further provided with a current display 123 and a voltage display 122, and the current display 123 and the voltage display 122 are electrically connected with the motor 126. The bottom of the fixing frame 125 is provided with a traveling wheel 13. The main rod 3 is internally provided with an auxiliary rod 14 which can be drawn out from the rear end of the main rod 3, the auxiliary rod 14 comprises an auxiliary rod body 142, the front end of the auxiliary rod body 142 is arranged in the main rod 3, the front end of the auxiliary rod body 142 is provided with an auxiliary rod stop sheet 143, and the rear end of the main rod 3 is provided with a stop rod 32 for stopping the auxiliary rod stop sheet 143; the rear end of the sub-lever body 142 is disposed outside the main lever 3, and a sub-lever balancing lever 141 for maintaining the left and right balance of the driving device 12 is disposed at the rear end of the sub-lever body 142. The supporting device 8 consists of two supporting sheets which are bent at right angles, one outer surface of each supporting sheet is connected with the lower surface of the main rod 3, and the distance between the two supporting sheets is 12cm; the guide 10 is a guide wheel.
When the device is used, the initial compression amount of the weight limiting spring 7 is adjusted by the adjusting bolt 5, then the supporting device 8 is clamped on the outer wall or the inner wall of the wall body beside the window or the edge of the window, the driving device 12 is placed on the ground, the auxiliary rod balancing rod 141 keeps the overall balance, the motor remote control switch 124 is started to descend, the lifting hook 9 is put down, the lifting hook 9 hooks the goods, and the motor remote control switch 124 is started to ascend, so that the goods are lifted; when the load of the driving device 12 is not enough to lift the goods, the auxiliary rod 14 is pulled out from the rear end of the main rod 3, and the non-pulled end of the auxiliary rod is clamped on the stop rod 32 to keep the connection of the main rod 3 and the auxiliary rod 14; when the goods are overweight or are clamped in a half-empty state, the weight limiting spring 7 is further compressed, the small lever 1 is pressed down to trigger the travel switch 2, the motor 126 is lifted and powered off, then the descending operation can be carried out only to remove the lifting limitation, and the whole-process overload protection function is realized.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be pointed out that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A jack, characterized in that: the mechanical whole-course weight-limiting power-off protection device comprises a main rod (3), wherein a small lever (1) for hoisting is inserted into the front end of the main rod (3), the rear end of the small lever (1) is connected onto the main rod (3) through a connecting bolt (31), a protective sleeve (6) is arranged below the small lever (1), the protective sleeve (6) is inserted into the main rod (3) and fixedly connected with the main rod (3), the upper end of the protective sleeve (6) keeps a distance with the small lever (1), the lower end of the protective sleeve is fixedly connected with a nut (4), a weight limiting spring (7) is placed in the protective sleeve (6), an adjusting bolt (5) is sleeved in the nut (4), one end of the weight limiting spring (7) is abutted to the lower surface of the small lever (1), and the other end of the weight limiting spring is abutted to the top of a screw rod of the adjusting bolt (5); a travel switch (2) is arranged on the main rod (3), and a rotating arm of the travel switch (2) is connected to the front end of the small lever (1); the weight limiting spring (7) is abutted to the position 1/3-1/2 away from the front end of the small lever (1); the distance between the upper end of the protective sleeve (6) and the small lever (1) is 3-15mm; a guide device (10) is arranged at the front end of a small lever (1) of the mechanical whole-course repeat-limiting power-off protection device, and a lifting hook (9) is arranged below the guide device (10); a fixing frame (125) is arranged at the rear end of a main rod (3) of the mechanical full-range weight-limiting power-off protection device, a driving device (12) is arranged on the fixing frame (125), a lifting hook (9) is connected with one end of a lifting rope (11), the other end of the lifting rope (11) bypasses a guide device (10) and is connected with the driving device (12), a supporting device (8) is arranged below the main rod (3), and the length of the supporting device (8) from the front end of the main rod (3) accounts for 1/4-1/3 of the length of the main rod (3); the travel switch (2) of the mechanical full-range repeat-limiting power-off protection device is connected with the lifting driving part of the driving device (12) in series.
2. Lifter according to claim 1, characterized in that: the driving device (12) comprises a winding drum (127), a motor (126) and a motor remote control switch (124), the motor remote control switch (124) is electrically connected with the motor (126), the motor (126) and the winding drum (127) are both installed on a fixed frame (125), the other end of the lifting rope (11) bypasses a guide device (10) and is connected with the winding drum (127), the winding drum (127) is connected with the power output of the motor (126), and the travel switch (2) is connected with a lifting key of the motor remote control switch (124) in series.
3. Lifter according to claim 2, characterized in that: a fan (121) is further arranged above the motor (126), and the fan (121) is installed on the fixing frame (125).
4. Lifter according to claim 2, characterized in that: the fixing frame (125) is further provided with a current display (123) and a voltage display (122), and the current display (123) and the voltage display (122) are electrically connected with the motor (126).
5. Lifter according to claim 1, characterized in that: and the bottom of the fixed frame (125) is provided with a traveling wheel (13).
6. Lifter according to claim 1, characterized in that: an auxiliary rod (14) which can be drawn out from the rear end of the main rod (3) is arranged in the main rod (3), the auxiliary rod (14) comprises an auxiliary rod body (142), the front end of the auxiliary rod body (142) is arranged in the main rod (3), an auxiliary rod stopping piece (143) is arranged at the front end of the auxiliary rod body (142), and a stop rod (32) for stopping the auxiliary rod stopping piece (143) is arranged at the rear end of the main rod (3); the rear end of the auxiliary rod body (142) is arranged outside the main rod (3), and the rear end of the auxiliary rod body (142) is provided with an auxiliary rod balancing rod (141) for keeping the left and right balance of the driving device (12).
7. Lifter according to claim 1, characterized in that: the supporting device (8) is composed of two supporting sheets which are bent at right angles, the outer surface of one supporting sheet is connected with the lower surface of the main rod (3), and the distance between the two supporting sheets is 10-12cm; the guiding device (10) is a guide wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710757127.1A CN107311060B (en) | 2017-08-29 | 2017-08-29 | Mechanical whole-course weight-limiting power-off protection device and jack applied by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710757127.1A CN107311060B (en) | 2017-08-29 | 2017-08-29 | Mechanical whole-course weight-limiting power-off protection device and jack applied by same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107311060A CN107311060A (en) | 2017-11-03 |
| CN107311060B true CN107311060B (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710757127.1A Active CN107311060B (en) | 2017-08-29 | 2017-08-29 | Mechanical whole-course weight-limiting power-off protection device and jack applied by same |
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| Country | Link |
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| CN (1) | CN107311060B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117383441B (en) * | 2023-12-07 | 2024-02-13 | 山西机电职业技术学院 | Overload self-protection crane |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2156763A (en) * | 1984-03-31 | 1985-10-16 | Penny Hydraulics Limited | Motorised winch or crane with load setting arrangement |
| CN201334334Y (en) * | 2009-01-22 | 2009-10-28 | 中国化学工程第三建设有限公司 | Hoisting machine with overload protection function |
| CN203820344U (en) * | 2014-04-30 | 2014-09-10 | 李军岐 | Material supplementary machine for exterior wall decoration |
| CN204917702U (en) * | 2015-09-06 | 2015-12-30 | 河南中机华远机械工程有限公司 | Take self preservation to protect driving of device |
| CN106276660A (en) * | 2016-08-24 | 2017-01-04 | 德马科起重机械有限公司 | A kind of crashproof stopping means of electric block |
| CN206014294U (en) * | 2016-09-21 | 2017-03-15 | 浙江永天机电制造有限公司 | Landing power-off and the double speed crane of overload freight weight limit |
-
2017
- 2017-08-29 CN CN201710757127.1A patent/CN107311060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2156763A (en) * | 1984-03-31 | 1985-10-16 | Penny Hydraulics Limited | Motorised winch or crane with load setting arrangement |
| CN201334334Y (en) * | 2009-01-22 | 2009-10-28 | 中国化学工程第三建设有限公司 | Hoisting machine with overload protection function |
| CN203820344U (en) * | 2014-04-30 | 2014-09-10 | 李军岐 | Material supplementary machine for exterior wall decoration |
| CN204917702U (en) * | 2015-09-06 | 2015-12-30 | 河南中机华远机械工程有限公司 | Take self preservation to protect driving of device |
| CN106276660A (en) * | 2016-08-24 | 2017-01-04 | 德马科起重机械有限公司 | A kind of crashproof stopping means of electric block |
| CN206014294U (en) * | 2016-09-21 | 2017-03-15 | 浙江永天机电制造有限公司 | Landing power-off and the double speed crane of overload freight weight limit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107311060A (en) | 2017-11-03 |
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