Crane load detection device

Abstract

The invention discloses a crane load detection device, and relates to the technical field of crane equipment, the crane load detection device comprises a shell, a cavity is formed in the shell, an extension spring is fixedly connected to the inner top wall of the cavity, and a movable block is fixedly connected to the bottom end of the extension spring; a first sliding groove and a second sliding groove are sequentially formed in the inner side wall of the cavity from top to bottom, a first sliding block and a second sliding block are slidably connected into the first sliding groove and the second sliding groove correspondingly, a first switch is fixedly connected to the inner side wall of the first sliding groove, a first contact block is fixedly connected to the first sliding block, and a second contact block is fixedly connected to the second sliding groove. The inner side wall of the first sliding groove is fixedly connected with a first switch, the first switch is opposite to the first contact block, the inner side wall of the second sliding groove is fixedly connected with a second switch, the second sliding block is fixedly connected with a second contact block, and the second switch is opposite to the second contact block; the movable block slides downwards in the cavity, and different sliding blocks are pushed to trigger different switches.

Description

Technical Field

[0001] The invention relates to the technical field of crane equipment, and in particular to a crane load detection device. Background Art

[0002] In various large-scale engineering construction, port operations and industrial production scenarios, cranes, as key lifting and handling equipment, undertake the important task of lifting and transporting heavy objects. From the construction of high-rise buildings, to the loading and unloading of containers at ports, to the transportation of raw materials and finished products in factories, cranes have greatly improved operational efficiency with their powerful lifting capabilities and have become an indispensable part of modern industry.

[0003] For example, an existing patent (publication number: CN213595718U) discloses a load detection device for a crane. When the weight hung on the hook exceeds the specified weight, the lifting of the weight will cause the vertical rod to drive the movable block to slide downward along the inside of the hollow shell, thereby stretching the spring until the trigger block at the lower end of the movable block presses the control switch downward, thereby activating the warning light to remind the user that the weight of the weight is overloaded, thereby preventing the lifting of overweight objects.

[0004] However, the above-designed crane load detection device still has some shortcomings in actual use: although the device can detect overload to a certain extent, its single control switch and warning light make it difficult to effectively distinguish different degrees of load changes. In actual operation, the load state of the crane is complex and changeable. Sometimes, although it has not reached the serious overload level, it is close to the safety threshold. At this time, if an early warning can be given, the operator can adjust the lifting plan in time to avoid further risk. However, the single warning device of the device cannot provide such refined prompts, and it is difficult to meet the needs of safe and efficient operation of the crane.

[0005] Therefore, we designed a crane load detection device to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a crane load detection device to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, a crane load detection device provided by the present invention includes a housing. A cavity is formed inside the housing. A tension spring is fixedly connected to the inner top wall of the cavity. The bottom end of the tension spring is fixedly connected to a movable block. The movable block is slidably connected inside the cavity. First and second chutes are sequentially formed in the inner side wall of the cavity from top to bottom. A first slider and a second slider are respectively slidably connected in the first and second chutes. A first spring is fixedly connected between the side of the first slider away from the cavity and the inner wall of the first chute. A second spring is fixedly connected between the side of the second slider away from the cavity and the inner wall of the second chute. A first switch is fixedly connected to the inner side wall of the first chute. A first contact block is fixedly connected to the first slider. The first switch and the first contact block face each other. A second switch is fixedly connected to the inner side wall of the second chute. A second contact block is fixedly connected to the second slider. The second switch and the second contact block face each other.

[0008] Further, a signal lamp and a buzzer are fixedly connected to an outer wall of one side of the housing. A storage battery is also fixedly connected to the outer wall of one side of the housing.

[0009] Further, a signal lamp and a buzzer are fixedly connected to an outer wall of one side of the housing. A storage battery is also fixedly connected to the outer wall of one side of the housing.

[0010] Further, the tops of the first slider and the second slider are inclined arc surfaces.

[0011] Further, a sliding rod is fixedly connected to the bottom end of the movable block. The sliding rod penetrates through the bottom wall of the housing and is slidably connected to the bottom wall of the housing.

[0012] Further, a hook is fixedly connected to the bottom end of the sliding rod. One end of the hook is hinged with a movable rod. A card slot is formed at the other end of the hook. The movable rod is clamped in the card slot.

[0013] Further, a limiting slot is formed at the bottom end of the card slot. The length of the limiting slot is greater than that of the card slot.

[0014] Further, the material of the movable rod is iron. A magnetic iron is arranged on the inner wall of the limiting slot.

[0015] Further, a working method of the crane load detection device includes the following steps:

[0016] Step 1: When the crane is performing a hoisting operation and the hook is hooked to a heavy object, the gravity of the heavy object is transmitted to the movable block through the sliding rod. At this time, under the action of the gravity of the heavy object, the movable block overcomes the elastic force of the tension spring and slides downward inside the cavity, and the tension spring is stretched;

[0017] Step 2: When the weight of the lifted heavy object reaches the first set value, the movable block pushes the first slider so that the first contact block on it contacts and triggers the first switch on the inner wall of the first chute;

[0018] Step 3: If the weight of the lifted heavy object continues to increase, the movable block slides downward continuously, further pushing the second slider until the second contact block on the second slider contacts and triggers the second switch on the inner wall of the second chute. Since the buzzer, the storage battery and the second switch are connected in series, this circuit is turned on and the buzzer emits an alarm sound.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In the present invention, two switches with different trigger thresholds, as well as corresponding signal lights and buzzers, are provided. When the load reaches the first set value, the signal light lights up to prompt the operator to pay attention and observe. At this time, it can early warn the state that the crane is approaching the safety threshold, giving the operator the opportunity to adjust the lifting plan in time to avoid further increase of the load. When the load continues to increase beyond the safety range, the buzzer emits an alarm sound, strongly reminding the operator to take measures immediately, effectively avoiding safety accidents caused by untimely or unclear warning, and better ensuring the safety of the crane lifting operation. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall external structure of the present invention;

[0022] Figure 2 is a schematic cross-sectional structure diagram inside the housing of the present invention;

[0023] Figure 3 is the present invention Figure 2 enlarged view of part A in;

[0024] Figure 4 is a detailed structural schematic diagram of the hook of the present invention.

[0025] In the figure: 1. Housing; 2. Tensile spring; 3. Movable block; 4. Cavity; 5. First chute; 6. Second chute; 7. First slider; 8. Second slider; 9. First spring; 10. Second spring; 11. First switch; 12. First contact block; 13. Second switch; 14. Second contact block; 15. Signal light; 16. Buzzer; 17. Storage battery; 18. Slide rod; 19. Hook; 20. Movable rod; 21. Card slot; 22. Limit slot. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Please refer to Figure 2 and Figure 3 The present invention provides a technical solution: a crane load detection device, including a housing 1. A cavity 4 is provided in the housing 1. A tension spring 2 is fixedly connected to the inner top wall of the cavity 4. The bottom end of the tension spring 2 is fixedly connected to a movable block 3. The movable block 3 is slidably connected in the cavity 4. A first sliding groove 5 and a second sliding groove 6 are successively provided on the inner side wall of the cavity 4 from top to bottom. A first slider 7 and a second slider 8 are slidably connected in the first sliding groove 5 and the second sliding groove 6 respectively. A first spring 9 is fixedly connected between the side of the first slider 7 away from the cavity 4 and the inner wall of the first sliding groove 5. A second spring 10 is fixedly connected between the side of the second slider 8 away from the cavity 4 and the inner wall of the second sliding groove 6. A first switch 11 is fixedly connected to the inner side wall of the first sliding groove 5. A first contact block 12 is fixedly connected to the first slider 7. The first switch 11 and the first contact block 12 face each other. A second switch 13 is fixedly connected to the inner side wall of the second sliding groove 6. A second contact block 14 is fixedly connected to the second slider 8. The second switch 13 and the second contact block 14 face each other.

[0029] During specific implementation, the gravity of the heavy object is transmitted to the movable block 3 through the sliding rod 18. At this time, under the action of the gravity of the heavy object, the movable block 3 overcomes the elastic force of the tension spring 2 and slides downward in the cavity 4, and the tension spring 2 is stretched. When the weight of the lifted heavy object reaches the first set value, the movable block 3 pushes the first slider 7 so that the first contact block 12 on it contacts and triggers the first switch 11 on the inner side wall of the first sliding groove 5. If the weight of the lifted heavy object continues to increase, the movable block 3 continues to slide downward and further pushes the second slider 8 until the second contact block 14 on the second slider 8 contacts and triggers the second switch 13 on the inner side wall of the second sliding groove 6.

[0030] Refer to Figure 1 and Figure 2 On one outer wall of the housing 1, a signal lamp 15 and a buzzer 16 are fixedly connected. On one outer wall of the housing 1, a storage battery 17 is also fixedly connected. On one outer wall of the housing 1, a signal lamp 15 and a buzzer 16 are fixedly connected. On one outer wall of the housing 1, a storage battery 17 is also fixedly connected.

[0031] During specific implementation, when the first contact block 12 touches the first switch 11, the signal lamp 15 lights up, prompting the operator that the current load has reached the first set value and the operator needs to pay attention and observe. When the second contact block 14 touches the second switch 13, the buzzer 16 emits an alarm sound, reminding the operator that the current load has exceeded the safe range, there may be danger, and immediate measures need to be taken.

[0032] Refer to Figure 3 , the tops of the first slider 7 and the second slider 8 are inclined arc surfaces.

[0033] During specific implementation, since the tops of the first slider 7 and the second slider 8 are inclined arc surfaces, when the movable block 3 slides down, it will push the first slider 7 and the second slider 8 to slide into the first chute 5 and the second chute 6 respectively.

[0034] Refer to Figure 2 , a sliding rod 18 is fixedly connected to the bottom end of the movable block 3, and the sliding rod 18 penetrates through the bottom wall of the housing 1 and is slidably connected to the bottom wall of the housing 1.

[0035] During specific implementation, during the entire lifting process, the sliding rod 18 slides on the bottom wall of the housing 1, transferring the displacement of the movable block 3 to the hook 19 to realize the lifting operation of the heavy object.

[0036] Refer to Figure 1 and Figure 4 , a hook 19 is fixedly connected to the bottom end of the sliding rod 18, one end of the hook 19 is hinged with a movable rod 20, a card slot 21 is opened at the other end of the hook 19, and the movable rod 20 is clamped in the card slot 21.

[0037] During specific implementation, the movable rod 20 hinged on the hook 19 can be inserted into the card slot 21 when hanging a heavy object to prevent the heavy object from accidentally detaching from the hook 19.

[0038] Refer to Figure 4 , a limiting groove 22 is opened at the bottom end of the card slot 21, the length of the limiting groove 22 is greater than that of the card slot 21, the material of the movable rod 20 is iron, and a magnetic iron is arranged on the inner wall of the limiting groove 22.

[0039] During specific implementation, the length of the limiting groove 22 is greater than that of the card slot 21, the material of the movable rod 20 is iron, and a magnetic iron is arranged on the inner wall of the limiting groove 22. Therefore, after the movable rod 20 is clamped in the card slot 21 and is toggled into the limiting groove 22, it will be subjected to the magnetic force of the magnetic iron, making its connection more stable and further ensuring the safety of the items during the lifting process.

[0040] Embodiment 2

[0041] The present invention provides a technical solution: a working method of a crane load detection device, including the following steps:

[0042] Step 1: When the crane is performing a lifting operation and the hook 19 is hooked to a heavy object, the gravity of the heavy object is transmitted to the movable block 3 through the sliding rod 18. At this time, under the action of the gravity of the heavy object, the movable block 3 overcomes the elastic force of the tension spring 2 and slides downward in the cavity 4, and the tension spring 2 is stretched.

[0043] Step 2: When the weight of the lifted heavy object reaches the first set value, the movable block 3 pushes the first slider 7 so that the first contact block 12 on it contacts and triggers the first switch 11 on the inner side wall of the first chute 5.

[0044] Step 3: If the weight of the lifted heavy object continues to increase, the movable block 3 continues to slide downward, further pushing the second slider 8 until the second contact block 14 on the second slider 8 contacts and triggers the second switch 13 on the inner side wall of the second chute 6. Since the buzzer 16, the battery 17 and the second switch 13 are connected in series, this circuit is turned on and the buzzer 16 emits an alarm sound.

[0045] Working principle: When the crane is performing a lifting operation and the hook 19 is hooked to a heavy object, the gravity of the heavy object is transmitted to the movable block 3 through the sliding rod 18. At this time, under the action of the gravity of the heavy object, the movable block 3 overcomes the elastic force of the tension spring 2 and slides downward in the cavity 4, and the tension spring 2 is stretched.

[0046] When the weight of the lifted heavy object reaches the first set value, the movable block 3 pushes the first slider 7 so that the first contact block 12 on it contacts and triggers the first switch 11 on the inner side wall of the first chute 5. Because the signal lamp 15, the battery 17 and the first switch 11 are connected in series, this circuit is turned on at this time and the signal lamp 15 lights up, prompting the operator that the current load has reached the first set value and needs to pay attention to observation.

[0047] If the weight of the lifted heavy object continues to increase, the movable block 3 continues to slide downward, further pushing the second slider 8 until the second contact block 14 on the second slider 8 contacts and triggers the second switch 13 on the inner side wall of the second chute 6. Since the buzzer 16, the battery 17 and the second switch 13 are connected in series, this circuit is turned on and the buzzer 16 emits an alarm sound, reminding the operator that the current load has exceeded the safe range, there may be danger, and immediate measures need to be taken.

[0048] The above has described an embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A crane load detection device, comprising a housing (1), characterized in that: A cavity (4) is provided in the shell (1), a tension spring (2) is fixedly connected to the inner top wall of the cavity (4), a movable block (3) is fixedly connected to the bottom end of the tension spring (2), the movable block (3) is slidably connected in the cavity (4), a first slide groove (5) and a second slide groove (6) are provided in the inner side wall of the cavity (4) from top to bottom, a first slider (7) and a second slider (8) are slidably connected in the first slide groove (5) and the second slide groove (6), respectively, a side of the first slider (7) away from the cavity (4) and the inner wall of the first slide groove (5) are fixedly connected A first spring (9), a second spring (10) is fixedly connected between the side of the second sliding block (8) away from the cavity (4) and the inner wall of the second sliding groove (6), a first switch (11) is fixedly connected to the inner wall of the first sliding groove (5), a first contact block (12) is fixedly connected to the first sliding block (7), the first switch (11) and the first contact block (12) are opposite to each other, a second switch (13) is fixedly connected to the inner wall of the second sliding groove (6), a second contact block (14) is fixedly connected to the second sliding block (8), the second switch (13) and the second contact block (14) are opposite to each other.

2. A crane load detection device according to claim 1, characterized in that: A signal light (15) and a buzzer (16) are fixedly connected to one side outer wall of the housing (1), and a storage battery (17) is also fixedly connected to one side outer wall of the housing (1).

3. A crane load detection device as claimed in claim 2, characterized in that: A signal light (15) and a buzzer (16) are fixedly connected to one side outer wall of the housing (1), and a storage battery (17) is also fixedly connected to one side outer wall of the housing (1).

4. A crane load detection device as claimed in claim 3, characterized in that: The top ends of the first sliding block (7) and the second sliding block (8) are inclined arc surfaces.

5. A crane load detection device as claimed in claim 4, characterized in that: The bottom end of the movable block (3) is fixedly connected to a sliding rod (18), and the sliding rod (18) penetrates the bottom wall of the shell (1) and is slidably connected to the bottom wall of the shell (1).

6. A crane load detection device as claimed in claim 5, characterized in that: The bottom end of the slide bar (18) is fixedly connected with a hook (19), one end of the hook (19) is hinged with a movable rod (20), the other end of the hook (19) is provided with a slot (21), and the movable rod (20) is locked in the slot (21).

7. A crane load detection device as claimed in claim 6, characterized in that: A limiting groove (22) is provided at the bottom end of the clamping slot (21), and the length of the limiting groove (22) is greater than that of the clamping slot (21).

8. A crane load detection device according to claim 7, characterized in that: The material of the movable rod (20) is iron.

9. A crane load detection device according to claim 7, characterized in that: The inner wall of the limiting groove (22) is provided with an ferromagnetic magnet.

10. A crane load detection device according to claim 7, characterized in that: The working method of the crane load detection device comprises the following steps: Step 1: When the crane is performing a lifting operation, after the hook (19) is hooked with a heavy object, the weight of the heavy object is transmitted to the movable block (3) through the slide bar (18). At this time, under the action of the weight of the heavy object, the movable block (3) overcomes the elastic force of the tension spring (2) and slides downward in the cavity (4), and the tension spring (2) is stretched; Step 2: When the weight of the hoisted object reaches a first set value, the movable block (3) pushes the first sliding block (7) so that the first contact block (12) on the first sliding block contacts the first switch (11) on the inner wall of the first sliding groove (5) and is triggered; Step 3: If the weight of the hoisted object continues to increase, the movable block (3) continues to slide downward, further pushing the second slider (8) until the second contact block (14) on the second slider (8) contacts and triggers the second switch (13) on the inner wall of the second slide groove (6). Since the buzzer (16), the storage battery (17) and the second switch (13) are connected in series, the circuit is turned on and the buzzer (16) emits an alarm sound.

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