A detection device for bridge crane hoist

Abstract

The present invention relates to the technical field of bridge cranes, and specifically to a detection device for bridge crane slings, wherein the detection device comprises a PLC and a position detection component, and when a lock block is in a locked position, the position detection component is triggered and sends an induction signal to the PLC; the detection device also comprises a photoelectric switch connected to the PLC, and when the PLC receives the induction signal, the PLC controls the photoelectric switch to turn on; the photoelectric switch comprises a transmitting end for transmitting a light signal and a receiving end for receiving the light signal; one of the transmitting end and the receiving end is arranged on the lock block and rotates synchronously with the lock block, and the other is arranged on the lock body to maintain positioning, and when the lock block is in the locked position, the transmitting end and the receiving end are located on the same straight line in the vertical direction. The present invention can detect that the lock block is not locked normally.

Description

[Technical field]

[0001] The invention relates to the technical field of bridge cranes, and in particular to a detection device for bridge crane hoists. [Background technology]

[0002] At present, the loading and unloading of containers is mainly carried out by bridge cranes. In order to facilitate lifting, four locking ears are generally set at the four corners of the four tops of existing containers. Therefore, four twist locks are set corresponding to the four locking ears of the lifting equipment of the bridge crane. During lifting, the lifting equipment is first lowered under the positioning of the self-positioning system of the bridge crane until its four twist locks fall into the positions of the four locking ears respectively, and the locking block 3 part of the twist lock is inserted into the locking ear M along the locking hole M1 of the locking ear M, and then the twist lock drives the locking block to rotate 90° through the locking shaft 1. At this time, the locking block 3 and the locking hole M1 of the locking ear M are cross-intersected, so that the locking block 3 is restricted in the locking ear M, completing the locking (i.e., locked state). The locking block cannot be pulled out of the locking ear without unlocking. When the four twist locks are all in the locked state, the operator can start lifting. In this way, when the bridge crane lifts the lifting equipment, the lifting equipment will lower the container and lift it under the action of the twist lock.

[0003] However, when the self-positioning system of the bridge crane deviates or manual operation makes a mistake, the following errors will occur: Fig. 9 In the situation shown, the two twist locks on the left end are normally inserted into the two locking ears M on the left end and enter the locked state, while the two twist locks on the right end are located outside the two locking ears on the right end. At this time, the twist lock action will also enter the locked state, which is equivalent to all four twist locks entering the locked state. However, since the two twist locks on the right side are not locked in the locking ears M, the two twist locks on the right side will not generate gripping force on the two locking ears M on the right side. Once the container is lifted, it is easy to collapse, so improvement is needed. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a detection device for a bridge crane hoist.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A detection device for a bridge crane sling, the sling comprising a twist lock, the twist lock comprising a lock body, a lock shaft arranged on the lock body and rotatable relative to the lock body, and a lock block arranged at the lower end of the lock shaft, the lock block rotates with the lock shaft to generate a locked position and an unlocked position, characterized in that the detection device comprises a PLC and a position detection element, when the lock block is in the locked position, the position detection element is triggered and sends an induction signal to the PLC;

[0007] The detection device also includes a photoelectric switch connected to the PLC, and when the PLC receives the sensing signal, the PLC controls the photoelectric switch to turn on;

[0008] The photoelectric switch comprises a transmitting end for transmitting a light signal and a receiving end for receiving the light signal; one of the transmitting end and the receiving end is arranged on the lock block and rotates synchronously with the lock block, and the other is arranged on the lock body to maintain positioning, and when the lock block is in the locked position, the transmitting end and the receiving end are located on the same straight line in the vertical direction;

[0009] When the photoelectric switch is in the on state, if the receiving end receives the light signal sent by the transmitting end, the PLC sends a first instruction to the control center; if the receiving end does not receive the light signal sent by the transmitting end, the PLC sends a second instruction.

[0010] The advantages of adopting this solution are:

[0011] First, in this solution, a photoelectric switch including a transmitter and a receiver is provided, and one of the transmitter and the receiver is provided on the lock block and rotates synchronously with the lock block, and the other is provided on the lock body to maintain positioning, and when the lock block is in the locked position, the transmitter and the receiver are located on the same straight line in the vertical direction, so that when the photoelectric switch is turned on and the lock block rotates to the locked position, if there is no obstruction between the transmitter and the receiver, the light emitted by the transmitter will be directly transmitted to the receiver to be received by the receiver, otherwise if there is an obstruction between the two, the receiver cannot normally receive the light from the transmitter, based on this:

[0012] When the lock block is normally inserted into the lock ear and rotated into the locking position, the receiving end on the lock block will rotate with the lock block to the lower part of the top wall of the lock ear. At this time, the top wall of the lock ear is blocked between the receiving end and the transmitting end, so that the optical signal emitted by the transmitting end cannot be transmitted to the receiving end at the lower part of the top wall of the lock ear. At this time, the receiving end cannot receive the optical signal, indicating that the lock block is locked normally, and then the PLC will send a second command to the control center to remind the operator to lift;

[0013] When the lock block appears as shown in the attached Figure 1 When the lock block shown in the figure completes the locking condition on one side of the lock ear, at this time, since the lock block is not normally inserted into the lock ear, the upper part of the lock block will not be blocked by the upper wall of the lock ear, that is, there is no obstruction between the transmitting end and the receiving end, so the receiving end can normally receive the light from the transmitting end, which indirectly indicates that the lock block is not locked in the lock ear. At this time, the PLC will send a first instruction to the control center to remind the operator that repositioning and locking are required.

[0014] Secondly, in this scheme, a position detection device is also provided. When the locking block is rotated to the locking position, the position detection device will be triggered and send a sensing signal to the PLC. Then the PLC responds to the sensing signal to control the photoelectric switch to open. In this way, the photoelectric switch can be automatically opened and closed. That is, only when the locking block is rotated to the locking position, the photoelectric switch will automatically open for subsequent actions, and when the locking block is out of the locking position, the photoelectric switch will automatically close. This simplifies the operation and eliminates the need for the operator to manually control the opening and closing of the photoelectric switch.

[0015] Preferably, a detection device for a bridge crane hanger according to claim 1 is characterized in that the receiving end is arranged on the upper wall of the lock block, the lock body has an installation cavity inside, the bottom wall of the installation cavity is provided with a through hole for light emitted by the transmitting end to pass through, and the transmitting end is arranged in the installation cavity and emits light downward toward the through hole.

[0016] Preferably, a groove is provided on the upper surface of the locking block, a mounting hole coaxially arranged with the transmitting end is provided at the bottom of the groove, the receiving end is arranged in the mounting hole, and a sealing plate made of a light-transmitting material for blocking the opening of the mounting hole is provided at the bottom of the groove, wherein the top wall of the sealing plate does not exceed the notch of the groove.

[0017] Preferably, the detection device also includes a purging mechanism for blowing away dust on the surface of the sealing plate, the purging mechanism includes an air pump, an air duct coaxially arranged with the lock shaft is opened in the lock shaft, and an air outlet hole connected to the air duct is opened on the groove wall at one end of the groove close to the lock shaft; the air outlet end of the air pump is connected to the upper end of the air duct.

[0018] Preferably, a docking hole connected to the airway is formed at the upper end of the lock shaft, and the docking hole is coaxially arranged with the airway; the purge mechanism also includes a docking tube and a sealing ring, and the docking tube is rotatably connected in the docking hole through a bearing and is coaxially arranged with the docking hole; the outer peripheral wall of the sealing ring is fixed on the hole wall of the docking hole, and the inner peripheral wall is sleeved on the docking tube and in conflict with the docking tube, or the inner peripheral wall of the sealing ring is fixedly sleeved on the docking tube, and the outer peripheral wall is in conflict with the hole wall of the docking hole.

[0019] Preferably, one end of the groove opposite to the air outlet passes through the side wall of the locking block to form an opening.

[0020] Preferably, the detection device also includes a safety mechanism, which includes a movable column arranged in the locking block and can be extended and retracted in the vertical direction, and an elastic member arranged in the locking block for pushing the movable column upward, and in an initial state, the top end of the movable column protrudes from the upper surface of the locking block; the safety mechanism also includes a detection member connected to the PLC, when the movable column is pressed down, the detection member is triggered and sends a trigger signal to the PLC, and the PLC responds to the trigger signal and feeds back information to the control center.

[0021] Preferably, the detection member includes a pressure sensor, which is located at the bottom of the movable column and remains fixed. The bottom of the movable column is provided with an elastic telescopic member that can be extended and retracted along the axial direction of the movable column. In an initial state, the lower end of the elastic telescopic member is spaced apart from the pressure sensor. When the movable column is pressed downward and displaced, the movable column drives the elastic telescopic member to move downward, and the lower end of the elastic telescopic member presses the pressure sensor to trigger the pressure sensor to generate a trigger signal.

[0022] Preferably, the elastic member is a spring or an elastic sheet.

[0023] Preferably, the position detection component includes a proximity switch and a trigger component for triggering the proximity switch, the trigger component is arranged on the outer wall of the lock shaft and rotates synchronously with the lock shaft, the proximity switch is arranged on the outside of the lock shaft and remains positioned, and when the lock block rotates to the locking position with the lock shaft, the trigger component triggers the proximity switch.

[0024] Other advantages and effects of the present invention are described in detail in the detailed description.

Brief Description of the Drawings

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the internal structure of the lock body;

[0028] Figure 3 for Figure 2 A partially enlarged schematic diagram of

[0029] Figure 4 It is a structural schematic diagram of the locking block;

[0030] Figure 5 It is a schematic diagram of the internal structure of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the insurance institution in the initial state;

[0032] Figure 7 This is a structural schematic diagram of the lock block in a normal locked state;

[0033] Figure 8 for Figure 7 A partial enlarged view of the

[0034] Fig. 9 This is a state diagram of the sling not being locked normally as mentioned in the background technology of the specification. [Specific implementation method]

[0035] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0036] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0037] Embodiment 1:

[0038] like Figures 1 to 9 As shown, a detection device for a bridge crane sling is shown, wherein the sling can adopt an existing bridge crane sling, the sling comprises a twist lock, the twist lock comprises a lock body 1, a lock shaft 2 arranged on the lock body 1 and rotatable relative to the lock body 1, and a lock block 3 arranged at the lower end of the lock shaft 2, the lock block 3 rotates with the lock shaft 2 to produce a locked position and an unlocked position, generally speaking, the lock block 3 rotates 90° in the unlocked position to enter the locked position, and vice versa, the locked position is reversed 90° to return to the unlocked position. The rotation of the lock shaft 2 can adopt an existing crank connecting rod mechanism or a gear mechanism, etc., which can be selected according to actual needs.

[0039] The detection device includes a PLC and a position detection element. When the locking block 3 is in the locked position, the position detection element is triggered and sends an induction signal to the PLC;

[0040] The detection device also includes a photoelectric switch connected to the PLC, and when the PLC receives the sensing signal, the PLC controls the photoelectric switch to turn on;

[0041] like Figure 3 and Figure 5 As shown, the photoelectric switch includes a transmitting end 51 for transmitting light signals and a receiving end 52 for receiving the light signals; the transmitting end 51 and the receiving end 52, the receiving end 52 is arranged on the lock block 3 and rotates synchronously with the lock block 3, the transmitting end 51 is arranged on the lock body 1 to keep the position, that is, it remains motionless relative to the lock body 1, when the lock block 3 is in the locked position, the transmitting end 51 and the receiving end 52 are located on the same straight line in the vertical direction, so that the light emitted by the transmitting end 51 directly hits the receiving end 52. (As shown Figure 5 Status shown)

[0042] Of course, in other optional implementations, the transmitting end 51 may also be arranged on the lock block 3 , and the receiving end 52 may be arranged on the lock body 1 .

[0043] When the photoelectric switch is in the on state, if the receiving end 52 receives the optical signal sent by the transmitting end 51, the PLC sends a first instruction to the control center; if the receiving end 52 does not receive the optical signal sent by the transmitting end 51, the PLC sends a second instruction to the control center.

[0044] First, in this solution, a photoelectric switch including a transmitting end 51 and a receiving end 52 is provided, and one of the transmitting end 51 and the receiving end 52 is provided on the lock block 3 to rotate synchronously with the lock block 3, and the other is provided on the lock body 1 to maintain positioning, and when the lock block 3 is in the locked position, the transmitting end 51 and the receiving end 52 are located on the same straight line in the vertical direction, so that when the photoelectric switch is turned on and the lock block 3 rotates to the locked position, if there is no obstruction between the transmitting end 51 and the receiving end 52, the light emitted by the transmitting end 51 will be directly transmitted to the receiving end 52 to be received by the receiving end 52, otherwise if there is an obstruction between the two, the receiving end 52 will not be able to normally receive the light from the transmitting end 51, based on this:

[0045] When the lock block 3 is normally inserted into the lock ear M and rotated into the locking position, Figure 7 In the state shown, the receiving end 52 on the lock block 3 will rotate with the lock block 3 to the lower position of the top wall of the lock ear M. At this time, the top wall of the lock ear M is blocked between the receiving end 52 and the transmitting end 51, so that the optical signal emitted by the transmitting end 51 cannot be transmitted to the receiving end 52 at the lower part of the top wall of the lock ear M. At this time, the receiving end 52 cannot receive the optical signal, indicating that the lock block 3 is locked normally, and then the PLC will send a second instruction to the control center to remind the operator that it is possible to lift;

[0046] When the lock block 3 appears as shown in the attached Fig. 9 When the lock block 3 shown in the figure completes the locking condition on one side of the lock ear M, since the lock block 3 is not normally inserted into the lock ear M, the upper part of the lock block 3 will not be blocked by the upper wall of the lock ear M, that is, there is no obstruction between the transmitting end 51 and the receiving end 52, so the receiving end 52 can normally receive the light from the transmitting end 51, which indirectly indicates that the lock block 3 is not locked in the lock ear M. At this time, the PLC will send a first instruction to the control center to remind the operator that repositioning and locking are required.

[0047] Secondly, in this scheme, a position detection component is also provided. When the lock block 3 is rotated to the locked position, the position detection component will be triggered and send a sensing signal to the PLC. Then the PLC responds to the sensing signal to control the photoelectric switch to open. In this way, the photoelectric switch can be automatically opened and closed, that is, only when the lock block 3 is rotated to the locked position, the photoelectric switch will automatically open for subsequent actions, and when the lock block 3 is out of the locked position, the photoelectric switch will automatically close. This simplifies the operation and eliminates the need for the operator to manually control the opening and closing of the photoelectric switch.

[0048] The objects corresponding to the first instruction and the second instruction here can be indicator lights. For example, a red light and a green light connected to the PLC are respectively provided in the control center. The first instruction corresponds to the red light, and the second instruction corresponds to the green light. When the lock block 3 is normally inserted into the lock ear M and rotated into the locked position, the PLC issues the second instruction, and the corresponding green light lights up, indicating that it is normal; when the lock block 3 is not normally inserted into the lock ear M and enters the locked position (such as Figure 1 The PLC sends out the first command, and the red light comes on, indicating that the locking is abnormal.

[0049] As for the specific installation structure of the transmitting end 51 and the receiving end 52, Figure 5 As shown, the receiving end 52 is arranged on the upper wall of the lock block 3, the lock body 1 has an installation cavity 11 inside, the bottom wall of the installation cavity 11 is provided with a through hole 12 for the light emitted by the emitting end 51 to pass through, the emitting end 51 is arranged in the installation cavity 11 and emits light downward toward the through hole 12, and in the locked position, the receiving end 52, the emitting end 51 and the through hole 12 are in a straight line. The emitting end 51 is fixed in the installation cavity 11 by a bracket 50.

[0050] The position detection component includes a proximity switch 41 connected to the PLC and a trigger component 42 for triggering the proximity switch 41. The trigger component 42 is, for example, a magnet, and the proximity switch 41 can be a reed switch, or a Hall sensor, etc., which are not specifically limited here. The trigger component 42 is arranged on the outer wall of the lock shaft 2 and rotates synchronously with the lock shaft 2. The proximity switch 41 is arranged on the outer side of the lock shaft 2 and remains in position. For example, the proximity switch 41 is fixed on the bracket 50; when the lock block 3 rotates to the locking position with the lock shaft 2, the trigger component 42 triggers the proximity switch 41, and then the proximity switch 41 sends an induction signal to the PLC, so that the PLC controls the photoelectric switch to turn on. When the trigger component 42 rotates with the lock shaft 2 and disengages from the proximity switch 41, the PLC controls the photoelectric switch to turn off.

[0051] If the receiving end 52 is directly arranged on the upper wall of the locking block 3, since the upper wall of the locking block 3 needs to be in contact with the upper inner wall of the locking ear M for a long time for lifting, the receiving end 52 is easily compressed and damaged. Figure 4 and Figure 5 As shown, a groove 32 is provided on the upper surface of the locking block 3, and a mounting hole 31 coaxially arranged with the transmitting end 51 is provided at the bottom of the groove 32, and the receiving end 52 is arranged in the mounting hole 31. Due to the existence of the groove 32, there will be a distance between the upper wall bearing surface of the locking block 3 and the receiving end 52, so that the upper wall of the locking ear M will not press the receiving end 52 during lifting, so as to prevent the receiving end 52 from being damaged by pressure.

[0052] In order to prevent dust and other impurities from directly falling into the mounting hole 31 and affecting the light receiving end 52, in this embodiment, Figure 5As shown, the bottom of the groove 32 is provided with a sealing plate 33 made of a light-transmitting material for sealing the opening of the mounting hole 31, so that the sealing plate 33 can form a blocking effect at the opening of the mounting hole 31 to prevent dust from entering, and since it is made of a light-transmitting material, it can ensure the normal passage of light; in order to prevent the sealing plate 33 from being crushed during hoisting, in this embodiment, the top wall of the sealing plate 33 does not exceed the notch of the groove 32, and preferably the upper wall of the sealing plate 33 is flush with the bottom of the groove 32.

[0053] Since the sealing plate 33 is easily contaminated with dust and other impurities during use, thereby affecting the light transmittance of the sealing plate 33, and further causing the light emitted by the transmitting end 51 to be unable to pass through the sealing plate 33 to be received by the receiving end 52, the present embodiment is further improved:

[0054] The detection device also includes a purge mechanism for blowing away dust on the surface of the sealing plate 33. The surface of the sealing plate 33 is purged by the purge mechanism. The purge mechanism includes an air pump (not shown in the figure). Figure 4 and Figure 5 As shown, an air channel 21 coaxially arranged with the lock shaft 2 is opened in the lock shaft 2, and an air outlet 34 connected with the air channel 21 is opened on the groove wall of the groove 32 close to the end of the lock shaft 2; the air outlet end of the air pump is connected with the upper end of the air channel 21, wherein the air pump can be a micro air pump, which can be fixedly mounted on the beam of the mounting hanger, and of course can also be installed on the lock body 1, such as the outer peripheral wall of the lock body 1 or the mounting cavity 11, which is not specifically limited here.

[0055] During use, before the bridge crane is used, the lock block 3 can be first controlled to rotate to the locked position. At this time, the photoelectric switch is turned on. If there are impurities on the sealing plate 33 that block the light transmission, the receiving end 52 will not receive the light emitted by the transmitting end 51. At this time, the green light will light up, reminding the staff that dust needs to be cleaned. At this time, the staff only needs to control the air pump to turn on the air pump, and the air pump pumps air into the air duct 21 to form an airflow. The airflow flows into the air outlet 34 through the air duct 21, and finally blows out into the groove 32 through the air outlet 34. At this time, the impurities attached to the sealing plate 33 will be blown away by the wind blown out by the air outlet 34. In this way, when the red light is on, it indicates that the sealing plate 33 can transmit light normally, and the air pump can be turned off at this time.

[0056] It is worth mentioning that in the present solution, the air flow transmission during the purging process mainly relies on the air channel 21 in the lock shaft 2 and the air outlet 34 on the lock block 3. The advantages of this method over the traditional pipeline transportation are, firstly, the structure is compact, and the entire air flow channel is located in the lock shaft 2 and the lock block 3, which will not interfere with the unlocking and locking of the twist lock and the lock ear M; secondly, the air outlet direction of the air outlet 34 can be purged parallel to the surface of the sealing plate 33, so that the impurities on the surface of the sealing plate 33 can be better blown away.

[0057] Furthermore, the traditional pipeline method is difficult to use in this device. First, because the locking block 3 needs to rotate with the locking shaft 2, if the pipeline is directly fixed on the locking shaft 2 or the locking block 3, when the locking shaft 2 rotates, the pipeline will be twisted, resulting in unsmooth air flow. In addition, since the upper wall of the locking block 3 is used as a load-bearing surface during hoisting, if the pipeline is set on its surface, it will be compressed during lifting and the pipeline will be damaged.

[0058] In this embodiment, by providing the air passage 21 on the lock shaft 2 and the air outlet 34 on the lock block 3, the disadvantages of the above-mentioned traditional pipeline method can be well avoided.

[0059] like Figure 4 As shown, one end of the groove 32 opposite to the air outlet 34 passes through the side wall of the locking block 3 to form an opening. The opening is designed to be exactly in the air outlet direction of the air outlet 34, so that the impurities in the groove 32 can be directly blown out from the opening along the horizontal direction of the groove 32. Assuming that there is no opening, the groove wall of the groove 32 at one end opposite to the air outlet 34 will form an obstacle. When the air outlet 34 blows away the impurities horizontally, the interior of the groove 32 cannot be completely cleaned, and some impurities may remain in the corners of the groove 32.

[0060] It is worth noting that, since the lock shaft 2 needs to rotate, the air outlet of the air pump cannot be directly connected to the air passage 21 in the lock shaft 2. Figure 5 As shown, a docking hole 22 communicating with the airway 21 is opened at the upper end of the lock shaft 2, and the docking hole 22 is coaxially arranged with the airway 21.

[0061] The purging mechanism also includes a docking tube 61, one end of which is rotatably connected to the docking hole 22 through a bearing 62 and is coaxially arranged with the docking hole 22, so that the docking tube 61 and the rotating shaft can rotate relative to each other around the axis of the rotating shaft, and the other end of the docking tube 61 is connected to the air outlet end of the air pump. It is worth mentioning that the docking tube 61 remains fixed, for example, the docking tube 61 is fixed by a fixing part, so that when the lock shaft 2 rotates, the docking tube 61 can remain stationary and will not rotate, which not only ensures that the airflow output by the air pump can be normally received, but also ensures the normal rotation of the lock shaft 2.

[0062] In order to ensure the sealing of the joint between the docking tube 61 and the docking hole 22, in this embodiment, the purge mechanism also includes a sealing ring 63, the outer peripheral wall of the sealing ring 63 is fixed on the hole wall of the docking hole 22, and the inner peripheral wall is sleeved on the docking tube 61 and contacts the docking tube 61. Of course, in other embodiments, the inner peripheral wall of the sealing ring 63 can also be fixedly sleeved on the docking tube 61, and the outer peripheral wall contacts the hole wall of the docking hole 22.

[0063] Example 2

[0064] In actual use, when the lifting device lifts and lowers the container, it is difficult for people to observe whether the bottom of the container has touched the ground. If the bottom of the container has not completely touched the ground, if the lock shaft 2 is controlled to rotate to make the lock block 3 to the unlocking position, the container will fall directly to the ground. Based on this, this embodiment makes further improvements on the basis of embodiment 1:

[0065] The detection device also includes a safety mechanism, such as Figure 4 and Figure 6 As shown, the safety mechanism includes a movable column 71 which is arranged in the locking block 3 and can be extended and retracted in the vertical direction, and an elastic member which is arranged in the locking block 3 and is used to push the movable column 71 upward. In the initial state, the top end of the movable column 71 protrudes from the upper surface of the locking block 3; the safety mechanism also includes a detection member connected to the PLC. When the movable column 71 is pressed down, the detection member is triggered and sends a trigger signal to the PLC. The PLC responds to the trigger signal and feeds back information to the control center.

[0066] Specifically: a vertical downward sliding cavity 35 is opened on the upper wall of the locking block 3, and the movable column 71 is movably arranged in the sliding cavity 35; a sliding block 73 that can slide up and down in the sliding cavity is fixed on the upper peripheral side wall of the movable column 71, and a stopper 74 is fixed on the side wall of the sliding cavity; the elastic member is a spring 72, and the spring 72 is sleeved on the movable column 71, one end of the spring 72 is in conflict with the bottom wall of the sliding block 73, and the other end is in conflict with the upper wall of the stopper 74. In the initial state (that is, the movable column 71 is not subjected to external force), the movable column 71 is pushed upward under the elastic force of the spring 72, and the upper wall of the sliding block 73 is in conflict with the upper wall of the sliding cavity to achieve limiting. At this time, the upper end of the movable column 71 extends out of the upper wall of the locking block 3.

[0067] In this way, when the lock block 3 is locked in the lock ear M of the container and the container is lifted but not on the ground, Figure 7 and Figure 8 In the state shown in the figure, the upper wall of the lock ear M will press the movable column 71 downward, pressing the movable column 71 into the lock block 3, and the detection piece will be triggered, and then send a trigger signal to the PLC, and the PLC will feed back the trigger signal to the control center. A signal light can be set in the control center. When there is a trigger signal, the PLC controls the signal light to light up, and when there is no induction signal, the signal light goes out; and when the container lands, the container is supported by the ground, and the upper wall of the lock ear M no longer presses the movable column 71. At this time, the movable column 71 is reset under the elastic force of the spring 72, and the detection piece is not triggered. The trigger signal disappears, and the PLC feeds back the information to the control center, and the signal light of the control center goes out.

[0068] In this way, the control center can know whether the container has landed simply by looking at whether the signal light is on or not.

[0069] Among them, Figure 6 As shown, the detection component includes a pressure sensor 76, which is located at the bottom of the movable column 71 and remains fixed. Specifically, it is fixedly installed on the bottom wall of the sliding cavity. The bottom of the movable column 71 is provided with an elastic telescopic component 75 that can be extended and retracted along the axial direction of the movable column 71. In the initial state, the lower end of the elastic telescopic component 75 is spaced apart from the pressure sensor 76. When the movable column 71 is pressed downward and displaced, the movable column 71 drives the elastic telescopic component 75 to move downward, and the lower end of the elastic telescopic component 75 presses the pressure sensor 76 to trigger the pressure sensor 76 to generate a trigger signal.

[0070] The elastic telescopic member 75 here can specifically adopt the elastic telescopic pin in the prior art, also called elastic pin, which mainly includes a sleeve 751, a pin shaft 752 arranged in the sleeve 751 and movable along the axial direction of the sleeve 751, and a compression spring 753 arranged between the sleeve 751 and the pin shaft 752. When the pin shaft 752 is pressed, the pin shaft 752 overcomes the elastic force of the compression spring 753 and shrinks into the sleeve 751. When the hand is released, the pin shaft 752 is reset and extended under the elastic force of the compression spring 753.

[0071] The sleeve 751 is fixed to the bottom of the movable column 71, and the pin shaft 752 is facing the pressure sensor 76. In this way, when the movable column 71 is pressed into the locking block 3, the pin shaft 752 will directly press the pressure sensor 76 to generate a pressure signal, that is, the sensing signal. When the external force of the movable column 71 disappears, the movable column 71 is reset, the pin shaft 752 is separated from the pressure sensor 76, and the pressure signal disappears.

[0072] Assuming that the elastic telescopic member 75 is not provided, but the bottom end of the movable column 71 is directly used to press the pressure sensor 76 to generate an induction signal, at this time, since the top of the movable column 71 will be subjected to a large pressure from the container during lifting, if the movable column 71 is directly used to press the pressure sensor 76, the pressure exerted on the movable column 71 will be fully applied to the pressure sensor 76, which may directly damage the pressure sensor 76; and after the elastic telescopic member 75 is used as an intermediate member for transmission, when the movable column 71 is pressed down, the elastic telescopic member 75 is driven downward to be pressed down, and when the elastic telescopic member 75 is pressed down, since it has its own elastic telescopic ability, the pressure applied to the pressure sensor 76 will be much smaller, so the pressure sensor 76 will not be directly damaged.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A detection device for a bridge crane sling, the sling comprising a twist lock, the twist lock comprising a lock body, a lock shaft disposed on the lock body and rotatable relative to the lock body, and a lock block disposed at the lower end of the lock shaft, the lock block rotates with the lock shaft to generate a locked position and an unlocked position, characterized in that: The detection device includes a PLC and a position detection element. When the locking block is in the locking position, the position detection element is triggered and sends an induction signal to the PLC; The detection device also includes a photoelectric switch connected to the PLC, and when the PLC receives the sensing signal, the PLC controls the photoelectric switch to turn on; The photoelectric switch comprises a transmitting end for transmitting a light signal and a receiving end for receiving the light signal; one of the transmitting end and the receiving end is arranged on the lock block and rotates synchronously with the lock block, and the other is arranged on the lock body to maintain positioning, and when the lock block is in the locked position, the transmitting end and the receiving end are located on the same straight line in the vertical direction; When the photoelectric switch is in the on state, if the receiving end receives the light signal sent by the transmitting end, the PLC sends a first instruction to the control center; if the receiving end does not receive the light signal sent by the transmitting end, the PLC sends a second instruction; The receiving end is arranged on the upper wall of the lock block, the lock body has an installation cavity inside, the bottom wall of the installation cavity is provided with a through hole for the light emitted by the emitting end to pass through, the emitting end is arranged in the installation cavity and emits light downward toward the through hole; The upper surface of the locking block is provided with a groove, the bottom of the groove is provided with a mounting hole coaxially arranged with the transmitting end, the receiving end is arranged in the mounting hole, and the bottom of the groove is provided with a sealing plate of a light-transmitting material for blocking the opening of the mounting hole, wherein the top wall of the sealing plate does not exceed the notch of the groove; The detection device also includes a purging mechanism for blowing away dust on the surface of the sealing plate, the purging mechanism includes an air pump, an air duct coaxially arranged with the lock shaft is opened in the lock shaft, and an air outlet hole connected to the air duct is opened on the groove wall at one end of the groove close to the lock shaft; the air outlet end of the air pump is connected to the upper end of the air duct.

2. A detection device for a bridge crane according to claim 1, characterized in that: A docking hole connected to the airway is formed at the upper end of the lock shaft, and the docking hole is coaxially arranged with the airway; the purge mechanism also includes a docking tube and a sealing ring, and the docking tube is rotatably connected in the docking hole through a bearing and is coaxially arranged with the docking hole; the outer peripheral wall of the sealing ring is fixed on the hole wall of the docking hole, and the inner peripheral wall is sleeved on the docking tube and conflicts with the docking tube, or the inner peripheral wall of the sealing ring is fixedly sleeved on the docking tube, and the outer peripheral wall conflicts with the hole wall of the docking hole.

3. A detection device for a bridge crane according to claim 1 or 2, characterized in that: One end of the groove opposite to the air outlet penetrates through the side wall of the locking block to form an opening.

4. A detection device for a bridge crane according to claim 1, characterized in that: The detection device also includes a safety mechanism, which includes a movable column arranged in the locking block and can be extended and retracted in the vertical direction, and an elastic member arranged in the locking block for pushing the movable column upward. In an initial state, the top end of the movable column protrudes from the upper surface of the locking block; the safety mechanism also includes a detection member connected to the PLC. When the movable column is pressed downward, the detection member is triggered and sends a trigger signal to the PLC. In response to the trigger signal, the PLC feeds back information to the control center.

5. A detection device for a bridge crane according to claim 4, characterized in that: The detection component includes a pressure sensor, which is located at the bottom of the movable column and remains fixed. The bottom of the movable column is provided with an elastic telescopic component that can be extended and retracted along the axial direction of the movable column. In an initial state, the lower end of the elastic telescopic component is spaced apart from the pressure sensor. When the movable column is pressed downward and displaced, the movable column drives the elastic telescopic component to move downward, and the lower end of the elastic telescopic component presses the pressure sensor to trigger the pressure sensor to generate a trigger signal.

6. A detection device for a bridge crane according to claim 4 or 5, characterized in that: The elastic member is a spring or an elastic sheet.

7. A detection device for a bridge crane according to claim 1, characterized in that: The position detection component includes a proximity switch and a trigger component for triggering the proximity switch. The trigger component is arranged on the outer wall of the lock shaft and rotates synchronously with the lock shaft. The proximity switch is arranged on the outside of the lock shaft and remains positioned. When the lock block rotates to the locking position with the lock shaft, the trigger component triggers the proximity switch.

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