AU2019100533A4 - Lift arm locking alarm device for lifting machine, and lifting machine using same - Google Patents

Lift arm locking alarm device for lifting machine, and lifting machine using same Download PDF

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AU2019100533A4
AU2019100533A4 AU2019100533A AU2019100533A AU2019100533A4 AU 2019100533 A4 AU2019100533 A4 AU 2019100533A4 AU 2019100533 A AU2019100533 A AU 2019100533A AU 2019100533 A AU2019100533 A AU 2019100533A AU 2019100533 A4 AU2019100533 A4 AU 2019100533A4
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lift arm
ejector rod
locking
lifting machine
alarm device
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AU2019100533A
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Wai Mak
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Abstract

A lift arm locking alarm device for a lifting machine is disclosed. The lift arm locking alarm device comprises a locking mechanism, a locking detection module, an alarm module and a power module, wherein the locking detection module is electrically 5 connected with the alarm module; the locking detection module and the alarm module are both electrically connected with the power module; the locking detection module is used for detecting whether or not the locking mechanism is normally locked; the alarm module gives an alarm when the locking mechanism fails to be normally locked; and the power module is used for supplying work power. In this way, the lift arm locking alarm device 10 for a lifting machine can give an alarm if the lift arm fails to be completely locked in the lifting process, and thus, the operating safety is improved. A lifting machine comprising the lift arm locking alarm device is further disclosed. ,-30B

Description

LIFT ARM LOCKING ALARM DEVICE FOR LIFTING MACHINE, AND LIFTING
MACHINE USING SAME
BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The invention relates to the field of lifting machines, in particular to a lift arm locking alarm device for a lifting machine, and a lifting machine using the same.
[0003] 2. Description of Related Art [0004] As an important auxiliary tool for maintaining heavy equipment such as vehicles, lifting machines are used for lifting the heavy equipment such as vehicles, so that bottom parts can be observed, maintained and replaced.
[0005] The lifting machines are commonly provided with a base, a support, a lift arm and a power mechanism, wherein the lift arm is hinged to the support and is able to move upwards and downwards. When the lifting machines are used, the lift arm is lowered to an initial position on the ground first and is then adjusted around a hinge point to a proper angle to make sure that the end of the lift arm is located at a proper position at the bottom of the equipment to support the equipment, and then, the power mechanism is started to lift the equipment.
[0006] The lift arm hinged to the support can rotate leftwards or rightwards. In order to keep the lifted vehicle stable, the lifting machines are provided with a lift arm locking mechanism to prevent the lift arm from rotating around the hinge point after the lift arm is lifted. The locking mechanism typically comprises an arc-shaped toothed block, a main ejector rod, a spring, and a circular gear, wherein the arc-shaped toothed block, the main ejector rod and the spring are arranged between two lug plates to be hinged to the lift arm, and the circular gear is arranged at the hinge end of the lift arm and is fixedly connected with the lift arm; the arc-shaped toothed block is fixedly connected to the
2019100533 17 May 2019 middle of the main ejector rod and cannot rotate; the two lug plates include an upper lug plate and a lower lug plate, through holes are formed in the upper lug plate and the lower lug plate, and the main ejector rod penetrates through the through hole of the upper lug plate to extend to a position above the upper lug plate and penetrates through the through hole of the lower lug plate to extend to a position below the lower lug plate; and the spring is arranged below the upper lug plate and above the arc-shaped toothed block. When the lift arm is located at the initial position on the ground, the lower end of the main ejector rod is lifted by the base to move upwards, and then the arc-shaped toothed block fixed to the main ejector rod is disengaged from the circular, so that the lift arm is unlocked and can rotate around the hinge point. When the lift arm is lifted upwards, the two lug plates rise accordingly, the main ejector rod moves downwards under the effect of an elastic force of the spring arranged between the two lug plates as well as the self gravity of the main ejector rod; when the lower end of the main ejector rod is completely separated from the base, the arc-shaped toothed block is completely engaged with the circular gear, so that the lift arm is locked and cannot rotate around the hinge point anymore. The prior art has the following defects: due to the fact that existing lifting machines cannot detect the lock state of the lift arm, confirmation of the lock state of the lift arm totally depends on the naked eyes of workers. When the locking mechanism fails to lock the lift arm due to certain reasons, the equipment lifted will be exposed in an instable state if continuing to be lifted by the lifting machine, which in turn causes damage to the equipment or even severely endanger the personal safety of maintainers in serious cases.
BRIEF SUMMARY OF THE INVENTION [0007] The technical issue to be settled by the invention is to provide a lift arm locking alarm device for a lifting machine.
[0008] The technical solution adopted by the invention to settle the above
2019100533 17 May 2019 technical issue is as follows:
[0009] A lift arm locking alarm device for a lifting machine comprises a locking mechanism which is used to lock a lift arm in the lifting process. The locking mechanism comprises an arc-shaped toothed block, a main ejector rod, an elastic component, and a circular gear arranged at a hinge end of the lift arm and fixedly connected with the lift arm, wherein the arc-shaped toothed block is fixedly connected to the middle of the main ejector rod and is arranged between two lug plates to be hinged to the lift arm; the two lug plates include an upper lug plate and a lower lug plate, and through holes are formed in the upper lug plate and the lower lug plate; the main ejector rod penetrates through the through hole of the upper lug plate to extend to a position above the upper lug plate and penetrates through the through hole of the lower lug plate to extend to a position below the lower lug plate; the elastic component is arranged below the upper lug plate and above the arc-shaped toothed block; when the arc-shaped toothed block is engaged with the circular gear, the lift arm is locked and cannot rotate around a hinge point; and when the arc-shaped toothed block is disengaged from the circular gear, the lift arm is unlocked and can freely rotate around the hinge point.
[0010] The lift arm locking alarm device for a lifting machine further comprises a locking detection module, an alarm module and a power module, wherein the locking detection module is electrically connected with the alarm module, and the locking detection module and the alarm module are both electrically connected with the power module.
[0011] The locking detection module is used for detecting whether or not the locking mechanism is normally locked.
[0012] The alarm module gives an alarm when the locking mechanism fails to be normally locked.
[0013] The power module is used for supplying work power.
2019100533 17 May 2019 [0014] The locking detection module comprises a first trigger switch and a first trigger mechanism, wherein the first trigger mechanism is linked with the locking mechanism and enables the first trigger switch to act when the lift arm is unlocked, and the main ejector rod serves as the first trigger mechanism.
[0015] On the basis of the abovementioned technical solution, the following improvements on the invention can be made.
[0016] Preferably, the lift arm locking alarm device for a lifting machine further comprises a lift arm position detection module which is used for detecting whether or not the lift arm is lifted away from an initial position. The lift arm position detection module comprises a second trigger switch and a second trigger mechanism, wherein the second trigger mechanism enables to the second trigger switch to act when the lift arm is lifted away from the initial position, and the second trigger switch is in series connection with the first trigger switch.
[0017] Preferably, the first trigger switch is a first microswitch which is fixed within the travel distance of the main ejector rod through an elastic component II, and the elastic coefficient of an action mechanism of the first trigger switch is smaller than that of the elastic component II.
[0018] Or, the main ejector rod is provided with a reducing part, and the first microswitch corresponds to the reducing part of the main ejector rod; and when the main ejector rod moves, the first microswitch is pressed by the reducing part to act.
[0019] Preferably, the first trigger switch is a first infrared through-beam switch, and a transmitting terminal and a receiving terminal of the first infrared through-beam switch are oppositely arranged on two sides of the main ejector rod and are located within the travel distance of an upper end of the main ejector rod.
[0020] Preferably, a first permanent magnet is arranged on the main ejector rod, and the first trigger switch is a first reed switch corresponding to the first permanent
2019100533 17 May 2019 magnet; and when the locking mechanism fails to be normally locked, the first reed switch acts.
[0021] Preferably, an auxiliary ejector rod serves as the second trigger mechanism and is provided with a stop block; the stop block is arranged between the two lug plates to be hinged to the lift arm; second through holes are formed in the upper lug plate and the lower lug plate, the auxiliary ejector rod penetrates through the second through hole of the upper lug plate to extend to a position above the upper lug plate and penetrates through the second through hole in the lower lug plate to extend to a position below the lower lug plate; and an elastic component III has an upper end in contact with a lower end face of the upper lug plate and a lower end in contact with an upper end face of the stop block.
[0022] Preferably, the second trigger switch is a second microswitch which is fixed within the travel distance of the auxiliary ejector rod through an elastic component IV, and the elastic coefficient of an action mechanism of the second microswitch is smaller than that of the elastic component IV.
[0023] Or, the auxiliary ejector rod is provided with a reducing part, and the second microswitch corresponds to the reducing part of the auxiliary ejector rod.
[0024] Preferably, the second trigger switch is a second infrared through-beam switch, and a transmitting terminal and a receiving terminal of the second infrared through-beam switch are oppositely arranged on two sides of the auxiliary ejector rod and are located within the travel distance of an upper end of the auxiliary ejector rod.
[0025] Preferably, a second permanent magnet is arranged on the auxiliary ejector rod, and the second trigger switch is a second reed switch corresponding to the second permanent magnet; and when the locking mechanism fails to be normally locked, the second reed switch acts.
[0026] Preferably, the power module is composed of a battery pack and a solar photovoltaic panel electrically connected with the battery pack, and the alarm module is a
2019100533 17 May 2019 buzzer.
[0027] Compared with the prior art, the invention has the following technical effects:
[0028] The lock state of the lift arm is detected; if it is found that the lift arm fails to be locked in the lifting process, an alarm is continuously given to remind workers to handle this situation in time; when the lift arm falls, an alarm signal is given out after the lift arm is unlocked to inform the workers of successful unlocking; and afterwards, the lift arm continues to fall, the lift arm position detection module works to cut off the work power to an alarm device, the alarm signal disappears, and thus, the safety of a lifting machine in use is greatly improved.
[0029] A lifting machine comprises a base, a support, a lift arm and a power mechanism, wherein the support is arranged on the base and is provided with a guide rail, a lift arm mounting base is arranged on the guide rail, the lift arm is hinged to two lug plates so as to be fixed to the lift arm mounting base, and the power mechanism drives the lift arm to move upwards or downwards on the guide rail. The lifting machine adopts the lift arm locking alarm device for a lifting machine.
[0030] Compared with the prior art, the invention has the following technical effects:
[0031] If it is found that the lift arm fails to be locked in the lifting process, an alarm will be continuously given to remind workers to handle this situation in time; when the lift arm falls, an alarm signal is given out after the lift arm is unlocked to inform the workers of successful unlocking; and afterwards, the lift arm continues to fall, the lift arm position detection module works to cut off the work power to an alarm device, and the alarm signal disappears. In this way, using is convenient, and the operating safety of the lifting machine is greatly improved.
2019100533 17 May 2019
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0032] FIG. 1 is a schematic diagram of a position where a lift arm locking alarm device for a lifting machine of the invention is used;
[0033] FIG. 2 is a first view of the lift arm locking alarm device for a lifting machine in an alarm state of the invention;
[0034] FIG. 3 is an enlarged view of part B in FIG. 2;
[0035] FIG. 4 is a second view of the lift arm locking alarm device for a lifting machine in the alarm state of the invention;
[0036] FIG. 5 is an enlarged view of part C in FIG. 4;
[0037] FIG. 6 is a first view of the lift arm locking alarm device for a lifting machine in a lock state of the invention;
[0038] FIG. 7 is an enlarged view of part D in FIG. 6;
[0039] FIG. 8 is a second view of the lift arm locking alarm device for a lifting machine in the lock state of the invention;
[0040] FIG. 9 is an enlarged view of part E in FIG. 8;
[0041] FIG. 10 is a first view of the lift arm locking alarm device for a lifting machine in an initial state of the invention;
[0042] FIG. 11 is an enlarged view of part F in FIG. 10;
[0043] FIG. 12 is a second view of the lift arm locking alarm device for a lifting machine in the initial state of the invention;
[0044] FIG. 13 is an enlarged view of part G in FIG. 12;
[0045] FIG. 14 is a schematic diagram of a first infrared through-beam switch in embodiment 3;
[0046] FIG. 15 is a schematic diagram of a first permanent magnet and a first reed switch in embodiment 4.
[0047] Components represented by the reference signs in the figures are as follows:
[0048] A, installation position of lift arm locking alarm device for lifting machine
[0049] 1, base;
[0050] 2, lift arm;
[0051] 2-1, circular gear;
[0052] 30, main ejector rod;
[0053] 30-1, reducing part;
[0054] 31, arc-shaped toothed block;
[0055] 32, first spring;
[0056] 33-1, upper lug plate;
[0057] 33-2, lower lug plate;
[0058] 35, first microswitch;
[0059] 40, auxiliary ejector rod;
[0060] 40-1, second permanent magnet;
[0061] 41, baffle;
[0062] 42, second spring;
[0063] 43, second reed switch;
[0064] 5, solar panel;
[0065] 6, receiving terminal of first infrared through-beam switch;
[0066] 6-1, transmitting terminal of first infrared through-beam switch;
[0067] 7, first permanent magnet;
[0068] 7-1, first reed switch.
DETAILED DESCRIPTION OF THE INVENTION
[0069] The principle and characteristics of the invention are described below with
reference to the accompanying drawings. The embodiments enumerated below are only
2019100533 17 May 2019 used to explain the invention and are not intended to limit the scope of the invention.
[0070] Referring to FIGs. 1-12, a lift arm locking alarm device for a lifting machine comprises a locking mechanism which is used to lock a lift arm in the lifting process. The locking mechanism comprises an arc-shaped toothed block 31, a main ejector rod 30, a first spring 32, and a circular gear 2-1 arranged at a hinge end of a lift arm 2 and fixedly connected with the lift arm 2, wherein about a quarter of the arc-shaped toothed block 31 is provided with teeth, a tooth-free part of the arc-shaped toothed block 31 is right-angled, and the right-angled part is matched with a right-angled beam of a support, so that the arc-shaped toothed block is prevented from rotating around the axis of the main ejector rod; the arc-shaped toothed block 31 is fixedly connected to about the middle of the main ejector rod 30 and is arranged between two lug plates to be hinged to the lift arm 2; the two lug plates include an upper lug plate 33-1 and a lower lug plate 33-2, through holes are formed in the upper lug plate 33-1 and the lower lug plate 33-2, and the main ejector rod penetrates through the through hole of the upper lug plate 33-1 to extend to a position above the upper lug plate 33-1 and penetrates through the through hole of the lower lug plate 33-2 to extend to a position below the lower lug plate 33-2; the first spring 32 is arranged below the upper lug plate 33-1 and above the arc-shaped toothed block 31; when the arc-shaped toothed block 31 is engaged with the circular gear 2-1, the lift arm 2 is locked and cannot rotate around a hinge point anymore; and when the arc-shaped toothed block 31 is disengaged from the circular gear 2-1, the lift arm 2 is unlocked and can freely rotate around the hinge point.
[0071] The lift arm locking alarm device for a lifting machine further comprises a locking detection module, an alarm module and a power module, wherein the power module is composed of a battery pack and a solar panel 5 electrically connected with the battery pack, the locking detection module is electrically connected with the alarm module, and the locking detection module and the alarm module are both electrically connected
2019100533 17 May 2019 with the power module.
[0072] The locking detection module is used for detecting whether or not the locking mechanism is normally locked.
[0073] The alarm module gives an alarm when the locking mechanism fails to be normally locked.
[0074] The power module is used for supplying work power.
[0075] The locking detection module comprises a first trigger switch and a first trigger mechanism, wherein the first trigger mechanism is linked with the locking mechanism and enables the first trigger switch to act when the lift arm is unlocked, and the main ejector rod 30 serves as the first trigger mechanism.
[0076] The lift arm locking alarm device for a lifting machine further comprises a lift arm position detection module which comprises a second trigger switch and a second trigger mechanism, wherein the second trigger mechanism enables the second trigger switch to act when the lift arm is lifted away from an initial position, and the second trigger switch is in series connection with the first trigger switch.
[0077] An auxiliary ejector rod 40 serves as the second trigger mechanism; a stop block 41 is arranged on a lower portion of the auxiliary ejector rod and is located between the two lug plates to be hinged to the lift arm; second through holes are formed in the upper lug plate 33-1 and the lower lug plate 33-2, and the auxiliary ejector rod 40 penetrates through the second through hole of the upper lug plate 33-1 to extend to a position above the upper lug plate 33-1 and penetrates through the second through hole of the lower lug plate 33-2 to extend to a position below the lower lug plate 33-2;a second spring 42 is arranged below the upper lug plate 33-1 and above the stop block 41; and a second permanent magnet 40-1 is arranged at an upper end of the auxiliary ejector rod 40, and the second trigger switch is a second reed switch 43 arranged at a corresponding position.
2019100533 17 May 2019 [0078] Embodiment 1:
[0079] The main ejector rod 30 is provided with a reducing part 30-1, the first trigger switch is a first microswitch 35 corresponding to the reducing part 30-1 of the main ejector rod 30, and the first microswitch 35 is a normally-open switch.
[0080] The auxiliary ejector rod 40 serving as the second trigger mechanism is provided with a second permanent magnet 40-1, the second trigger switch is a second reed switch 43 corresponding to the second permanent magnet 40-1, the second reed switch 43 is a normally-closed reed switch, and when the locking mechanism fails to be normally locked, the second reed switch 43 acts.
[0081] Initial state:
[0082] Refer to FIG. 10 and FIG 12 which are schematic diagrams of the lift arm locking alarm device for a lifting machine in the initial state of the invention.
[0083] At this moment, the lift arm 2 is located at an initial position, which means that the lift arm 2 entirely falls to the bottom end of the support; the main ejector rod 30 and the auxiliary ejector rod 40 are supported and limited by the base 1 to move upwards relative to the circular gear 2-1; and then the arc-shaped toothed block 31 fixed to the main ejector rod 30 is disengaged from the circular gear 2-1, so that the lift arm 2 is unlocked and can freely rotate around a hinge point.
[0084] Referring to FIG 11 which is an enlarged view of part F in FIG 10, at this moment, the second permanent magnet 40-1 arranged at the upper end of the auxiliary ejector rod 40 is located in the middle of the second reed switch 43, and the second reed switch acts to be turned off, so as to cut off circuit connection.
[0085] Referring to FIG 13 which is an enlarged view of part G in FIG 12, at this moment, the reducing part 30-1 of the main ejector rod 30 moves upwards to completely stretch across a trigger arm of the first microswitch 35, and a large-diameter position of the reducing part of the main ejector rod presses the trigger arm of the first microswitch 35,
2019100533 17 May 2019 so that the microswitch 35 acts to be turned on, so as to trigger an alarm state.
[0086] Due to the fact that the first microswitch 35 and the second reed switch 43 are connected in series to work and the reed switch 43 is still turned off although the first microswitch 35 is turned on, an alarm device will not give an alarm in this case.
[0087] Working state:
[0088] Refer to FIG. 2 and FIG. 4 which are schematic diagrams of the lift arm locking alarm device for a lifting machine in the alarm state of the invention.
[0089] At this moment, the lift arm has been lifted upwards by a small distance, the main ejector rod 30 and the auxiliary ejector rod 40 move downwards relative to the lift arm under the effect of the elastic force of the first spring 32 and the second spring 42; normally, the main ejector rod 30 continues to move downwards under the effect of the elastic force of the first spring 32 while the lift arm continues to be lifted, and the arc-shaped toothed block 31 descends accordingly to be completely engaged with the circular gear 2-1, so that the lift arm is locked and is finally clamped on the lower lug plate 33-2; the auxiliary ejector rod 40 also continuous to move downwards under the effect of the elastic force of the second spring 42 till the baffle 41 arranged on the auxiliary ejector rod 40 is clamped on the lower lug plate 33-2, and afterwards, the main ejector rod 30 and the auxiliary ejector rod 40 stop moving relative to the lift arm and are kept static relative to the lift arm 2. However, an exception may occur in the operating process if the arc-shaped toothed block 31 gets stuck for various reasons and fails to normally fall to be engaged with the circular gear 2-1 even if the lift arm 2 is lifted high enough and the distance between the bottom plane of the lower lug plate 33-2 and the base 1 allows the arc-shaped toothed block 31 on the main ejector rod 30 and the baffle 41 on the auxiliary ejector rod 40 to be clamped on the lower lug plate 33-2 , and in this case, the lift arm actually fails to be locked.
[0090] Referring to FIG. 3 which is an enlarged view of part B in FIG. 2, at this
2019100533 17 May 2019 moment, the auxiliary ejector rod 40 has moved downwards by a certain distance, the second permanent magnet 40-1 at the top end of the auxiliary ejector rod 40 is separated from the middle of the second reed switch 43 and fails to enable the second reed switch 43 to act, and thus, the second reed switch 43 recovers to the default on-state.
[0091] Referring to FIG. 5 which is an enlarged view of part C in FIG. 4, at this moment, the large-diameter position of the reducing part 30-1 of the main ejector rod 30 still makes contact with the first microswitch 35, and the first microswitch 35 is triggered to be in the alarm state.
[0092] The first microswitch 35 and the second reed switch are connected in series to work and are turned on at the same time, so that the alarm device gives an alarm.
[0093] Off-working state:
[0094] Refer to FIG. 6 and FIG. 8 which are schematic diagrams of the lift arm locking alarm device for a lifting machine in the lock state of the invention.
[0095] At this moment, the lift arm 2 has been lifted upwards by a certain distance, the main ejector rod 30 and the auxiliary ejector rod 40 have been entirely separated from the base 1, the arc-shaped toothed block 31 arranged on the main ejector rod 30 is completely engaged with the circular gear 2-1 arranged on the lift arm 2, the lift arm is totally locked, and the locking mechanism is operated in place.
[0096] Referring to FIG. 7 which is an enlarged view of part D in FIG. 6, at this moment, the auxiliary ejector rod 40 entirely falls to the bottom, the second permanent magnet 40-1 arranged at the upper end of the auxiliary ejector rod 40 is completely separated from the middle of the second reed switch 43, and the second reed switch 43 is in the default on-state.
[0097] Referring to FIG. 9 which is an enlarged view of part E in FIG. 8, at this moment, the main ejector rod 30 entirely falls to the bottom, the reducing part 30-1 of the main ejector rod 30 falls accordingly, the first microswitch 35 corresponds to the
2019100533 17 May 2019 small-diameter end of the reducing part 30-1 in this case and cannot be triggered by the small-diameter end, and thus, the first microswitch 35 is in the default on-state.
[0098] Due to the fact that the first microswitch 35 and the second reed switch 43 are connected in series to work and the first microswitch 35 is still turned off although the reed switch 43 is turned on, no alarm is given.
[0099] Embodiment 2:
[00100] The first trigger switch is a first microswitch which is fixed within the travel distance of the main ejector rod through an elastic component II and is normally open; due to the fact that the elastic coefficient of an action mechanism of the first trigger switch is smaller than that of the elastic component II, when the main ejector rod rises, the first microswitch is pressed to act first, then the main ejector rod continues to rise, the elastic component II used for fixing the first microswitch contracts accordingly, and thus, the first microswitch is prevented from being damaged. Only when the main ejector rod entirely falls and is completely engaged with the circular gear to lock the lift arm, the first microswitch is separated from the main ejector rod and returns to the normally-open state.
[00101] Embodiment 3:
[00102] As shown in FIG. 14, the first trigger switch is a first infrared through-beam switch, a transmitting terminal 6-1 and a receiving terminal 6 of the first infrared through-beam switch are oppositely arranged on two sides of the main ejector rod, and a through hole allowing a through beam to pass through is formed in the main ejector rod. When the locking mechanism fails to be fully locked, the main ejector rod cannot fall in place, the through hole in the main ejector rod is not located on the same horizontal plane as the through beam and blocks a light path of the first infrared through-beam switch, and the switch is in the off-state; and when the main ejector rod falls in place, the through hole in the main ejector rod is located on the same horizontal plane as the through beam, and the first infrared through-beam switch is turned on.
2019100533 17 May 2019 [00103] Embodiment 4:
[00104] As shown in FIG. 15, a first main permanent magnet 7 is arranged on the main ejector rod, and the first trigger switch is a first reed switch 7-1 corresponding to the first permanent magnet; and when the locking mechanism fails to be normally locked, the first reed switch 7-1 acts. The operating principle of the first trigger switch is similar to that of the second trigger switch in embodiment 1 and will not be detailed anymore herein.
[00105] Embodiments:
[00106] The auxiliary ejector rod is provided with a reducing part, and the second trigger switch is a second microswitch corresponding to the reducing part of the auxiliary ejector rod. The operating principle of the second trigger switch is similar to that of the first trigger switch in embodiment 1 and will not be detailed anymore herein.
[00107] Embodiment 6:
[00108] The second trigger switch is a second microswitch which is fixed within the travel distance of the auxiliary ejector rod through an elastic component IV, and the elastic coefficient of an action mechanism of the second trigger switch is smaller than that of the elastic component IV. The operating principle of the second trigger switch is similar to that of the first trigger switch in embodiment 2 and will not be detailed anymore herein.
[00109] Embodiment?:
[00110] The second trigger switch is a second infrared through-beam switch, and a transmitting terminal and a receiving terminal of the second infrared through-beam switch are oppositely arranged on two sides of the auxiliary ejector rod and are located within the travel distance of the upper end of the auxiliary ejector rod. The operating principle of the second trigger switch is the same as that of the first trigger switch in embodiment 3 and will not be detailed anymore herein.
[00111] Preferably, the power module is a solar photovoltaic panel, and the alarm module is a buzzer.
2019100533 17 May 2019 [00112] Compared with the prior art, the invention has the following technical effects:
[00113] The lock state of the lift arm is detected; if it is found that the lift arm fails to be locked in the lifting process, an alarm is continuously given to remind workers to handle this situation in time; when the lift arm falls, an alarm signal is given out after the lift arm is unlocked to inform the workers of successful unlocking; and afterwards, the lift arm continues to fall, the lift arm position detection module works to cut off the work power to the alarm device, the alarm signal disappears, and continuous alarming is avoided. In this way, the safety of a lifting machine in use is greatly improved.
[00114] Compared with the prior art, the invention has the following technical effects:
[00115] If it is found that the lift arm fails to be locked in the lifting process, an alarm will be continuously given to workers to handle this situation in time; when the lift arm falls, an alarm signal is given out after the lift arm is unlocked to inform the workers of successful unlocking; and afterwards, the lift arm continues to fall, the lift arm position detection module works to cut off the work power to the alarm device, and the alarm signal disappears. In this way, using is convenient, and the operating safety of a lifting machine is greatly improved.
[00116] A lifting machine comprises a base, a support, a lift arm and a power mechanism, wherein the support is arranged on the base and is provided with a guide rail, a lift arm mounting base is arranged on the guide rail, the lift arm is hinged to two lug plates so as to be fixed to the lift arm mounting base, and the power mechanism drives the lift arm to move upwards or downwards on the guide rail. The lifting machine adopts the lift arm locking alarm device for a lifting machine.
[00117] According to the lifting machine of the invention, an alarm will be given in time when the lift arm fails to be locked, so that the operating safety of the lifting machine is greatly improved.
[00118] The above embodiments are only preferred ones of the invention and are not intended to limit the invention. Any modifications, equivalent substitutes and improvements based on the spirit and principle of the invention should also fall within the protection scope of the invention.

Claims (11)

  1. What is claimed is:
    1. A lift arm locking alarm device for a lifting machine, comprising a locking mechanism which is used to lock a lift arm in a lifting process, wherein:
    the lift arm locking alarm device further comprises a locking detection module, an
    5 alarm module and a power module; the locking detection module is electrically connected with the alarm module, and the locking detection module and the alarm module are both electrically connected with the power module;
    the locking detection module is used for detecting whether or not the locking mechanism is normally locked;
    10 the alarm module gives an alarm when the locking mechanism fails to be normally locked;
    the power module is used for supplying work power;
    the locking detection module comprises a first trigger switch and a first trigger mechanism, and the first trigger mechanism is linked with the locking mechanism 15 and enables the first trigger switch to act when the lift arm is unlocked; and a main ejector rod serves as the first trigger mechanism.
  2. 2. The lift arm locking alarm device for a lifting machine according to Claim 1, wherein the lift arm locking alarm device further comprises a lift arm position detection module which comprises a second trigger switch and a second trigger mechanism, and the
    20 second trigger mechanism enables the second trigger switch to act after the lift arm is lifted away from an initial position; and the second trigger switch is in series connection with the first trigger switch.
  3. 3. The lift arm locking alarm device for a lifting machine according to Claim 1, wherein the first trigger switch is a first microswitch;
    25 the first microswitch is fixed within a travel distance of the main ejector rod through an elastic component II;
    2019100533 17 May 2019 or, the main ejector rod is provided with a reducing part, and the first microswitch corresponds to the reducing part located on the main ejector rod.
  4. 4. The lift arm locking alarm device for a lifting machine according to Claim 1, wherein the first trigger switch is a first infrared through-beam switch, and a transmitting
  5. 5 terminal and a receiving terminal of the first infrared through-beam switch are oppositely arranged on two sides of the main ejector rod and are located within a travel distance of an upper end of the main ejector rod.
    5. The lift arm locking alarm device for a lifting machine according to Claim 1, wherein a first permanent magnet is arranged on the main ejector rod, and the first trigger
    10 switch is a first reed switch corresponding to the first permanent magnet.
  6. 6. The lift arm locking alarm device for a lifting machine according to Claim 2, wherein an auxiliary ejector rod serves as the second trigger mechanism and is provided with a stop block, and the stop block is arranged between two lug plates to be hinged to the lift arm; the two lug plates include an upper lug plate and a lower plug plate, and
    15 second through holes are formed in the upper lug plate and the lower lug plate; the auxiliary ejector rod penetrates through the second through hole of the upper lug plate to extend to a position above the upper lug plate and penetrates through the second through hole of the lower lug plate to extend to a position below the lower lug plate; and an elastic component III has an upper end in contact with a lower end face of the upper lug plate and
    20 a lower end in contact with an upper end face of the stop block.
  7. 7. The lift arm locking alarm device for a lifting machine according to Claim 6, wherein the second trigger switch is a second microswitch;
    the second microswitch is fixed within a travel distance of the auxiliary ejector rod through an elastic component IV;
    25 or, the auxiliary ejector rod is provided with a reducing part, and the second microswitch corresponds to the reducing part of the auxiliary ejector rod.
    2019100533 17 May 2019
  8. 8. The lift arm locking alarm device for a lifting machine according to Claim 6, wherein the second trigger switch is a second infrared through-beam switch, and a transmitting terminal and a receiving terminal of the second infrared through-beam switch are oppositely arranged on two sides of the auxiliary ejector rod and are located within a
    5 travel distance of an upper end of the auxiliary ejector rod;
    or, the auxiliary ejector rod is provided with a second permanent magnet, and the second trigger switch is a second reed switch corresponding to the second permanent magnet.
  9. 9. The lift arm locking alarm device for a lifting machine according to any one of
  10. 10 Claims 1-8, wherein the power module is composed of a battery pack and a solar photovoltaic panel electrically connected with the battery pack, and the alarm module is a buzzer.
    10. A lifting machine, comprising a base, a support, a lift arm and a power mechanism, wherein the support is arranged on the base and is provided with a guide rail, a lift arm
  11. 15 mounting base is arranged on the guide rail, the lift arm is hinged to two lug plates so as to be fixed to the lift arm mounting base, and the power mechanism drives the lift arm to move upwards or downwards on the guide rail; and the lift alarm adopts the lift arm locking alarm device for a lifting machine according to any one of Claims 1-9.
AU2019100533A 2019-04-18 2019-05-17 Lift arm locking alarm device for lifting machine, and lifting machine using same Active AU2019100533A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201920525714.2U CN210313419U (en) 2019-04-18 2019-04-18 Lifting machine lifting arm locking alarm device and lifting machine using same
CN201920525714.2 2019-04-18

Publications (1)

Publication Number Publication Date
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AU (1) AU2019100533A4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111873952A (en) * 2020-08-13 2020-11-03 青岛中汽特种汽车有限公司 Engineering vehicle landing leg rotating fixing and detecting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111823776B (en) * 2020-07-22 2021-11-23 安徽科技学院 Wheel disassembly and positioning chassis for scraped car
CN115520805B (en) * 2022-11-29 2023-04-28 佛山市南海区远山汽车设备有限公司 Bracket arm locking structure of automobile lifter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111873952A (en) * 2020-08-13 2020-11-03 青岛中汽特种汽车有限公司 Engineering vehicle landing leg rotating fixing and detecting device

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