CN219098567U

CN219098567U - Novel height limiter

Info

Publication number: CN219098567U
Application number: CN202223486560.1U
Authority: CN
Inventors: 占昌久; 钱佳泉
Original assignee: Changzhou Changxinqi Heavy Lift Technology Co ltd
Current assignee: Changzhou Changxinqi Heavy Lift Technology Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-05-30
Anticipated expiration: 2032-12-27

Abstract

The utility model belongs to the technical field of height limiters, in particular to a novel height limiter, which comprises a rear cover, a transmission mechanism arranged on one side of the rear cover and a control unit arranged in the rear cover. The worm is connected with the winding drum shaft through the square sleeve and rotates through the control unit; the worm drives the worm wheel along with the worm, the distance position and the angle position of the cam group are adjusted through the transmission between the worm and the worm wheel, the purposes that the cam group and the micro switch are respectively contacted at different heights in the ascending and descending processes of the power winding drum, and the multi-point opening and closing control is carried out are achieved, and further the safety and the prevention of the crane in the operation are achieved.

Description

Novel height limiter

Technical Field

The utility model relates to the technical field of height limiters, in particular to a novel height limiter.

Background

The novel height limiter is one of safety protection devices of hoisting machinery. The lifting power source is automatically cut off when the lifting appliance of the crane rises to the highest limit position, and the winding drum stops rotating, so that the lifting appliance does not rise continuously any more, and the lifting appliance is prevented from colliding with the cross beam (arm support). When the lifting appliance descends to the lowest limit position, the descending power source is automatically cut off, and the winding drum stops rotating, so that the lifting appliance does not descend continuously, and the winding circle number of the steel wire rope on the winding drum is not less than the safety circle number specified by design. In order to ensure the operational reliability of the lifting height limiter, a user should check, repair and maintain the lifting height limiter, and the lifting height limiter is strictly operated according to the operation regulations of the crane. In the use process of the crane, because the lifting height limiter fails and is not carefully checked before operation, the lifting hook is lifted, and the situations of injuring personnel and damaging equipment are caused. In order to prevent the repeated occurrence of similar accidents, the lifting height limiter should be carefully analyzed from the design point of view, and a device with more perfect functions and more reliable actions is designed to ensure safe production.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art, and provides a novel height limiter which is used for solving the problems of lifting hook ejection, injury of personnel and equipment damage caused by failure of the lifting height limiter in the using process of a crane.

The novel height limiter comprises a rear cover, a transmission mechanism arranged on one side of the rear cover and a control unit arranged in the rear cover, wherein the transmission mechanism comprises a worm, a worm wheel and a cam fixing shaft, the worm wheel is meshed with one side of the worm, and the cam fixing shaft is coaxially and fixedly arranged on the worm wheel;

the control unit comprises a switch mechanism and an adjusting component, the adjusting component is arranged at the position of the edge part of the upper end part of the cam fixing shaft, the switch mechanism comprises a micro switch group and a cam group, the cam group is sleeved outside the adjusting component and the cam fixing shaft, the micro switch group is contacted with a boss of the cam group, and the cam group adjusts an angle through the cam fixing shaft and the adjusting component.

By adopting the technical scheme, the cam group and the micro-switch group are respectively contacted at different heights in the ascending and descending processes of the power winding drum, so that the purposes of multipoint opening and closing control are achieved, and further the safety and prevention of the crane in operation are achieved.

The micro-gap switch group includes first micro-gap switch, second micro-gap switch, third micro-gap switch and fourth micro-gap switch, cam group includes first cam, second cam, third cam and fourth cam, adjusting part includes first adjust knob, second adjust knob, third adjust knob and fourth adjust knob, first micro-gap switch, second micro-gap switch, third micro-gap switch and fourth micro-gap switch set up with first cam, second cam, third cam and fourth cam one-to-one respectively, first cam, second cam, third cam and fourth cam all through its inner circle tooth with first adjust knob, second adjust knob, third adjust knob and fourth adjust knob on the gear engagement transmission be connected respectively.

By adopting the technical scheme, the angle adjustment of the cam group can be adjusted.

The micro switch components are distributed on two sides of the cam group in a two-by-two overlapping mode, a check ring is sleeved at the upper end of the cam fixing shaft and located above the micro switch group, and a micro switch locating plate fixedly connected with the micro switch groups on two sides of the cam group is sleeved on the outer side of the check ring.

By adopting the technical scheme, the micro switch can be reinforced and prevented from shaking.

The top of the cam fixed shaft is provided with a gland locked by a screw, the screw is rotationally connected with the top of the cam fixed shaft, and the edge of the bottom of the gland is positioned on the upper end face of the retainer ring to be attached.

Through adopting above-mentioned technical scheme, can loosen the screw, make the gland become flexible, debug the position and the angle of boss on the cam through adjusting component.

One end of the worm is rotatably connected with a connecting flange through a bearing.

Through adopting above-mentioned technical scheme, can directly connect on hoist reel blank cap, also can fix after on a support, change square cover for sprocket, gear, take healthy axle or cross groove etc. for the form of installation can change according to user's actual demand change.

The novel height limiter has the beneficial effects that:

1. through the arrangement of the control unit, the worm is connected with the winding drum shaft through the square sleeve and rotates; the worm drives the worm wheel along with the worm, the distance position and the angle position of the cam group are adjusted through the transmission between the worm and the worm wheel, so that the cam group and the micro switch are respectively contacted at different heights in the ascending and descending processes of the power winding drum, the purpose of multipoint opening and closing control is achieved, and the safety and the prevention of the crane in the operation are further achieved;

2. through setting up screw and gland, through loosening the screw, make the gland become flexible, loosen the pressure of pressing through the retaining ring to the cam group, the cam group is under pretightning force, but adjusting component's first adjust knob, second adjust knob, third adjust knob and fourth adjust knob free rotation, debugging the position and the angle of ring gear formula first cam, second cam, third cam and fourth cam of one-to-one.

Drawings

FIG. 1 is a schematic view of the overall structure of a novel height limiter according to the present utility model;

FIG. 2 is a first view of the novel height limiter of the present utility model;

FIG. 3 is a schematic view showing the internal structures of the novel height limiter connecting flange and the rear cover;

FIG. 4 is a schematic diagram of a novel height limiter control unit according to the present utility model;

FIG. 5 is a graph showing the position profile of the novel height limiter adjustment assembly of the present utility model;

FIG. 6 is a schematic view of a novel height limiter cam set according to the present utility model;

FIG. 7 is a first view of the novel height limiter transmission mechanism of the present utility model;

fig. 8 is a second view of the novel height limiter transmission mechanism according to the present utility model.

In the figure: 1. a rear cover; 2. a micro-switch positioning plate; 3. a connecting flange; 4. a worm; 5. a worm wheel; 6. a cam fixing shaft; 7. a retainer ring; 8. a switching mechanism; 801. a microswitch group; 801a, a first micro switch; 801b, a second micro switch; 801c, a third microswitch; 801d, a fourth micro switch; 802. a cam group; 802a, a first cam; 802b, a second cam; 802c, a third cam; 802d, fourth cam; 9. an adjustment assembly; 901. a first adjustment knob; 902. a second adjustment knob; 903. a third adjustment knob; 904. a fourth adjustment knob; 10. a screw; 11. and (5) pressing cover.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

Referring to fig. 1 to 8, a novel height limiter comprises a rear cover 1, a transmission mechanism arranged on one side of the rear cover 1 and a control unit arranged in the rear cover 1, wherein the transmission mechanism comprises a worm 4, a worm wheel 5 and a cam fixing shaft 6, the worm wheel 5 is meshed with one side of the worm 4, and the cam fixing shaft 6 is coaxially and fixedly arranged on the worm wheel 5;

the control unit comprises a switch mechanism 8 and an adjusting component 9, the adjusting component 9 is arranged at the position of the edge part of the upper end part of the cam fixing shaft 6 in a stepped mode, the switch mechanism 8 comprises a micro switch group 801 and a cam group 802, the cam group 802 is sleeved outside the adjusting component 9 and the cam fixing shaft 6, the micro switch group 801 is contacted with a boss of the cam group 802, and the cam group 802 adjusts an angle through the cam fixing shaft 6 and the adjusting component 9; the worm 4 is connected with the winding drum shaft through a square sleeve and rotates; the worm 4 drives the worm wheel 5, the distance position and the angle position of the cam group 802 are adjusted through the transmission between the worm 4 and the worm wheel 5, so that the cam group 802 and the micro switch group 801 are respectively contacted at different heights in the ascending and descending processes of the power winding drum, the purposes of multipoint opening and closing control are achieved, and the safety and the prevention of the crane in the operation are further achieved;

the first adjusting knob 901, the second adjusting knob 902, the third adjusting knob 903 and the fourth adjusting knob 904 on the adjusting assembly 9 are designed to be gear type, the cam group 802 is designed to be internal gear type, thus the adjusting assembly 9 and the cam group 802 form gear transmission, and when in field installation and debugging, the first adjusting knob 901, the second adjusting knob 902, the third adjusting knob 903 and the fourth adjusting knob 904 on the adjusting assembly 9 are driven by a screwdriver, so that the position and the angle of the cam group 802 are driven to be adjusted accurately, quickly and conveniently. The angle of the cam is changed, the cam is lifted and debugged by hands intuitively, the force is often controlled inaccurately, the cam is excessively regulated, the debugging time is slow, and the cam is unsafe.

The micro switch set 801 includes a first micro switch 801a, a second micro switch 801b, a third micro switch 801c and a fourth micro switch 801d, the cam set 802 includes a first cam 802a, a second cam 802b, a third cam 802c and a fourth cam 802d, the adjusting assembly 9 includes a first adjusting knob 901, a second adjusting knob 902, a third adjusting knob 903 and a fourth adjusting knob 904, the first micro switch 801a, the second micro switch 801b, the third micro switch 801c and the fourth micro switch 801d are respectively arranged in one-to-one correspondence with the first cam 802a, the second cam 802b, the third cam 802c and the fourth cam 802d, and the first cam 802a, the second cam 802b, the third cam 802c and the fourth cam 802d are respectively engaged with gears on the first adjusting knob 901, the second adjusting knob 902, the third adjusting knob 903 and the fourth adjusting knob 904 through inner ring teeth thereof; the microswitch set 801 and the cam set 802 have 4 sets, and the cam set 802 is respectively 802d, the second cam 802b, the third cam 802c and the first cam 802a from bottom to top. If the first cam 802a and the third cam 802c and the corresponding first micro switch 801a and the third micro switch 801c are the ascending protection and the second cam 802b and the fourth cam 802d and the corresponding second micro switch 802b and the fourth micro switch 801d are the descending protection.

When the ascending limit position is adjusted, the first adjusting knob 901 corresponding to the first cam 802a is rotated, so that the position of the first cam 802a just opens the first micro switch 801a, and the power source is cut off. And then adjusts the third adjustment knob 903 corresponding to the third cam 802c to be in the alarm position.

When the descending limit position is adjusted, the lifting appliance is firstly positioned at the lower limit position, the fourth adjusting knob 904 corresponding to the fourth cam 802d is firstly rotated when the descending limit position is adjusted, the fourth micro switch 801d is just opened at the position where the fourth cam 802d is positioned, and the power source is cut off. The corresponding second adjustment knob 902 of the second cam 802b is then adjusted to place the corresponding cam set 802b in the alarm position. After adjusting the position and angle of each part of cam set 802, cam set 802 cannot be easily rotated after tightening screw 10.

The first cam 802a and the third cam 802c can be controlled to cut off the rising limit by operating with any one of the corresponding first micro switch 801a and third micro switch 801c, and the second cam 802b and the fourth cam 802d can be controlled to cut off the falling limit by operating with any one of the corresponding second micro switch 801b and fourth micro switch 801 d.

And the micro switches with the rising limit and the falling limit can be independently connected in parallel, or can be connected in series.

The micro switch groups 801 are divided into two groups which are overlapped and distributed on two sides of the cam group 802, a check ring 7 is sleeved at the upper end part of the cam fixing shaft 6 and positioned above the micro switch groups 801, and a micro switch positioning plate 2 fixedly connected with the micro switch groups 801 on two sides of the cam group 802 is sleeved outside the check ring 7; in order to prevent the cam group 802 from contacting with the micro switch group 801 during long-term use and causing shaking of the micro switch group 801 and loosening of a fixing screw, the micro switch positioning plate 2 is designed to connect the micro switch groups 801 on two sides of the cam group 802 into a whole, so that the functions of strengthening and preventing shaking are achieved;

the cam group 802 is respectively a fourth cam 802d, a second cam 802b, a third cam 802c and a first cam 802a from bottom to top, and the adjusting assemblies 9 with different lengths respectively adjust the angles of each part of the corresponding cam group 802, and are independent of each other and are not affected by each other.

The first micro switch 801a, the second micro switch 801b, the third micro switch 801c, the fourth micro switch 801d and the cam group 802 are selected to be smaller, so that the appearance of the height limiter is more attractive and smaller. The performance is safer, reliable, and can install in narrower space.

A pressing cover 11 locked by a screw 10 is arranged at the top end part of the cam fixing shaft 6, the screw 10 is rotationally connected with the top end part of the cam fixing shaft 6, and the bottom edge of the pressing cover 11 is attached to the upper end surface of the retainer ring 7; angle adjustment of each part of cam set 802: by loosening the screw 10 to loosen the gland 11, the pressing of the cam group 802 by the retainer ring 7 is loosened, but a certain pretightening force is required, at this time, the cam group 802 can freely rotate under the pretightening force, and the rotating direction of the adjusting assembly 9 is kept consistent with the actual rotating direction of the cam group 802 during the mechanism movement during the debugging by the planetary first adjusting knob 901, the second adjusting knob 902, the third adjusting knob 903 and the fourth adjusting knob 904.

One end of the worm 4 is rotatably connected with a connecting flange 3 through a bearing; the connecting flange 3 can be directly connected to the cover of the crane drum or can be fixed on a support, and then the square sleeve is replaced by a chain wheel, a gear, a belt shaft or a cross groove. A small micro switch set 801 is selected. The micro-switch spacer and cam set 802 are changed to plastic, making the height limiter lighter.

The lifting hook is powered on to descend or ascend about 1m away from the limit position and then ascend or descend again. Checking whether the power source is respectively alarmed and cut off before and at the limit position. Adjustments can be made again if necessary until the corresponding action points are accurate. Safety is absolutely noted throughout the process. After debugging, the rear cover 1 is covered, and after a few rounds of tests of empty hanging and full loading, the test bed can be put into use formally.

The cam fixing shaft 6 is changed into bearing transmission, so that the transmission (surface-surface transmission) resistance between the original cam fixing shaft 6 and the copper spacer is reduced, and the cam group 802 on the cam fixing shaft 6 is contacted with the micro switch group 801 at a uniform speed. The micro switch set 801 is prevented from being subjected to impact forces of the cam sets 802 with different speeds to control the micro switch set 801, so that the service life of the micro switch set 801 is prolonged, and the cam sets 802 are prevented from being offset in angle due to the fact that the micro switch set 801 is subjected to different impact forces for a long time.

It should be noted that: the cam group 802 and the micro switch group 801 of the novel height limiter are not limited to 4 groups, but can be 6 groups.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. The utility model provides a novel height limiter, includes back lid (1), installs in the drive mechanism of back lid (1) one side and installs the control unit in back lid (1), its characterized in that: the transmission mechanism comprises a worm (4), a worm wheel (5) and a cam fixing shaft (6), wherein the worm wheel (5) is meshed with one side of the worm (4), and the cam fixing shaft (6) is coaxially and fixedly arranged on the worm wheel (5);

the control unit comprises a switch mechanism (8) and an adjusting assembly (9), the adjusting assembly (9) is mounted at the position of the upper end edge part of the cam fixing shaft (6) in a stepped mode, the switch mechanism (8) comprises a micro switch group (801) and a cam group (802), the cam group (802) is sleeved outside the adjusting assembly (9) and the cam fixing shaft (6), the micro switch group (801) is in contact with a boss of the cam group (802), and the cam group (802) adjusts an angle through the cam fixing shaft (6) and the adjusting assembly (9).

2. The novel height limiter of claim 1 wherein: the micro-gap switch group (801) includes first micro-gap switch (801 a), second micro-gap switch (801 b), third micro-gap switch (801 c) and fourth micro-gap switch (801 d), cam group (802) include first cam (802 a), second cam (802 b), third cam (802 c) and fourth cam (802 d), adjusting part (9) include first adjust knob (901), second adjust knob (902), third adjust knob (903) and fourth adjust knob (904), first micro-gap switch (801 a), second micro-gap switch (801 b), third micro-gap switch (801 c) and fourth micro-gap switch (801 d) respectively with first cam (802 a), second cam (802 b), third cam (802 c) and fourth cam (802 d) one-to-one setting, first cam (802 a), second cam (802 b), third cam (802 c) and fourth cam (802 d) all with first adjust knob (901), second adjust knob (903), third adjust knob (903) and fourth adjust knob (904) are connected through its inner circle tooth respectively on transmission.

3. The novel height limiter of claim 2 wherein: the micro-gap switch group (801) is divided into two groups and is distributed on two sides of the cam group (802) in a superposition mode, a check ring (7) is sleeved at the upper end portion of the cam fixing shaft (6) and is located above the micro-gap switch group (801), and a micro-gap switch locating plate (2) fixedly connected with the micro-gap switch group (801) on two sides of the cam group (802) is sleeved on the outer side of the check ring (7).

4. A novel height limiter as claimed in claim 3 wherein: the top end part of the cam fixing shaft (6) is provided with a gland (11) locked by a screw (10), the screw (10) is rotationally connected with the top end part of the cam fixing shaft (6), and the bottom edge of the gland (11) is positioned on the upper end surface of the retainer ring (7) to be attached.

5. The novel height limiter of claim 4 wherein: one end of the worm (4) is rotatably connected with a connecting flange (3) through a bearing.