Cable drum alarm triggering device and towing engineering machinery

Abstract

The utility model relates to an alarm triggering device, and provides a cable drum alarm triggering device and a towing engineering machine in order to solve the problems that an existing cable drum monitoring device is complex in structure and high in cost. The alarm trigger device comprises a support fixedly installed on a winding drum shell, a screw in transmission connection with a winding drum main shaft, a nut block in threaded fit connection with the screw, a guide part fixed to the support and used for limiting circumferential rotation of the nut block, and a trigger switch fixed to the support and right opposite to the axial end of the nut block. Threads of the screw and the nut block are configured to enable the nut block to move towards the trigger switch when the winding drum rotates for paying off, and the nut block triggers the trigger switch when the winding drum rotates to the paying-off alarm number of turns. The reel pay-off alarm triggering device is simple in structure, low in cost and reliable in performance.

Description

Technical Field

[0001] The utility model relates to an alarm triggering device, more specifically, to a cable drum alarm triggering device and a towing engineering machine. Background Art

[0002] Towed electric engineering machinery that draws power from the mains grid through cables, such as towed electric excavators and towed electric loaders, are equipped with cable reels for retracting and releasing towed electric cables. When the machine is moving, attention must be paid to the length of the released cable to prevent the cable from being pulled out and causing cable damage.

[0003] In the prior art, the rotation of the cable drum is usually monitored by a multifunctional limiter, which is composed of a high-precision large transmission ratio reducer, a mechanical memory control mechanism synchronized with its output shaft, and a sensor. The displacement signal of the multifunctional limiter synchronized with the controlled mechanism is connected to the input shaft of the limiter after the speed change of the external hanging wheel, and is converted into an angular displacement signal of the output shaft through the speed change of the reducer. The multifunctional limiter has complex technology, complex structure, poor reliability and high cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing cable drum monitoring device has a complex structure and high cost, and provides a cable drum alarm triggering device and a towing engineering machinery.

[0005] The utility model provides a technical solution to achieve its purpose: a reel pay-off alarm trigger device is provided, which comprises: a bracket fixedly mounted on a reel housing, a screw rod drivingly connected to the reel main shaft, a nut block threadably connected to the screw rod, a guide portion fixed on the bracket and used to limit the circumferential rotation of the nut block, and a trigger switch fixed on the bracket and facing the axial end of the nut block;

[0006] The threads of the screw rod and the nut block are configured such that when the reel rotates to release the line, the nut block moves toward the trigger switch, and when the reel rotates to the number of turns for the line release alarm, the nut block triggers the trigger switch.

[0007] In the reel pay-off alarm trigger device of the utility model, there are two trigger switches and the nut blocks are configured to be triggered successively when the nut blocks move toward the trigger switches. Further, the trigger switches are proximity switches or button switches.

[0008] In the reel pay-off alarm trigger device of the utility model, the screw is fixedly connected to the end of the reel main shaft, or the screw is connected to the end of the reel main shaft through a transmission gear.

[0009] In the reel-release alarm trigger device of the utility model, the guide part is at least one guide rod which axially penetrates the nut block and the end of which is fixedly connected to the bracket.

[0010] In the reel-release alarm trigger device of the utility model, the bracket is in the shape of a U-shaped bent plate, the nut block is arranged between the bent plates on both sides of the bracket, the first side bent plate of the bracket is fixedly connected to the reel shell, the second side bent plate of the bracket is opposite to the axial end of the nut block, and the trigger switch is fixed on the second side bent plate.

[0011] In the reel-release alarm trigger device of the utility model, an axial slide groove is arranged on the surface of the nut block, and the guide part is composed of a plate fixed on the bracket and having a guiding straight edge arranged in the axial slide groove.

[0012] In the reel-release alarm trigger device of the utility model, the two trigger switches are flush with the triggering parts of the nut block in the axial direction of the nut block; the distance between the two acting parts on the nut block corresponding to the triggering parts of the two trigger switches in the axial direction of the nut block is 0.5 to 2 times the pitch of the screw, and the screw is fixedly connected to the end of the reel main shaft.

[0013] The utility model provides a technical solution to achieve its purpose: to provide a towing engineering machinery, including a cable retracting drum for retracting and releasing the towing cable and the aforementioned drum wire-releasing alarm trigger device, wherein the trigger switch is electrically connected to the cable retracting and releasing control system.

[0014] Compared with the prior art, the reel pay-off alarm trigger device of the utility model has a simple structure, low cost and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a cable retracting and unreeling drum.

[0016] Figure 2 It is a front view of the cable retractable drum of the utility model.

[0017] Figure 3 yes Figure 2 Partial view at point I in the middle.

[0018] Figure 4 yes Figure 3 Sectional view along the B axis.

[0019] Figure 5 yes Figure 3 Center A view.

[0020] Parts names and serial numbers in the figure:

[0021] The reel 10, the reel housing 11, the driving device 12, the reel main shaft 13, the reel pay-off alarm trigger device 20, the bracket 30, the first side bending plate 31, the second side bending plate 32, the guide part 33, the screw 40, the nut block 50, the first acting part 51, the second acting part 52, the trigger switch 60, the first trigger switch 61, and the second trigger switch 62. DETAILED DESCRIPTION

[0022] The specific implementation scheme is described below with reference to the accompanying drawings.

[0023] Figure 1 Figure 2 The structure of a cable retractable reel is shown, in which the reel 10 is installed on a reel housing 11 (reel support) through a reel main shaft 13, and one end of the reel main shaft 13 is connected to a driving device 12 such as a hydraulic motor or an electric motor, and is driven to rotate by the driving device 12 to realize the reeling and releasing of the cable on the reel 10.

[0024] The cable reel includes a reel-release alarm trigger device 20. Figures 3 to 5 As shown, the reel-release alarm trigger device 20 includes: a bracket 30 fixedly mounted on the reel housing 11, a screw rod 40 drivingly connected to the reel main shaft 13, a nut block 50 threadedly connected to the screw rod 40, a guide portion 33 fixed on the bracket 30 and used to limit the circumferential rotation of the nut block 50, and a trigger switch 60 fixed on the bracket 30 and directly opposite to the axial end of the nut block 50; the threads of the screw rod 40 and the nut block 50 are configured so that the nut block 50 moves toward the trigger switch 60 when the reel 10 rotates to release the line, and when the reel 10 rotates to the number of turns for the line release alarm, the nut block 50 triggers and excites the trigger switch 60, so that the trigger switch 60 sends an electrical signal that can be recognized by the cable retraction and release control system.

[0025] The trigger switch 60 is electrically connected to the cable retraction and release control system. When the trigger switch 60 is triggered, the cable retraction and release control system issues an alarm or stops retracting the cable. The machine that carries the cable retraction and release drum or the machine that retracts the cable through the cable retraction and release drum also takes corresponding measures based on the trigger signal of the trigger switch 60 to prevent the cable on the drum from being fully released and broken.

[0026] Optionally, there are two trigger switches 60 and they are configured to be triggered by the nut block 50 in sequence when the nut block 50 moves toward the trigger switch 60. Figure 5As shown, a first trigger switch 61 and a second trigger switch 62 are mounted on the bracket 30, and the first trigger switch 61 and the second trigger switch 62 are flush with the trigger portion of the nut block 50 (the end of the trigger switch facing the nut block 50) in the axial direction of the nut block 50; the distance between the first action portion 51 and the second action portion 52 on the nut block 50 corresponding to the two trigger switches 60 in the axial direction of the nut block 50 is 0.5 to 2 times the screw pitch. The screw 40 is fixedly connected to the end of the reel main shaft 13. When the nut block 50 moves toward the trigger switch 60, the first acting part 51 on the nut block 50 first acts on the first trigger switch 61 to trigger the first trigger switch 61. At this time, the distance between the second trigger switch 62 and the second acting part 52 is a set distance (the distance is usually set to 0.5 to 2 times the screw pitch), that is, the cable wound on the reel 10 still has a corresponding number of turns (if the screw 40 is fixedly connected to the reel main shaft 13, the number of turns of the cable wound on the reel 10 is equal to the ratio of the distance between the second trigger switch 62 and the second acting part 52 to the pitch). At this time, the cable retraction and release control system can issue an alarm according to the trigger signal of the first trigger switch 61, prompting the operator that the cable will be pulled out. If after the first trigger switch 61 is triggered, the reel 10 continues to pay out the line until the second trigger switch 62 and the second action part 52 interact and trigger it, the cable retraction control system or the machine that retracts the cable through the cable retraction reel takes corresponding active measures, such as limiting the movement or action of the machine in the direction of pulling the cable, to avoid the cable on the reel being completely paid out and broken.

[0027] In this embodiment, the trigger switch 60 may be a proximity switch, and when the nut block 50 moves toward the trigger switch 60 to a distance less than a predetermined value, the corresponding action portion on the nut block 50 senses the sensing portion in the trigger switch 60 and triggers the generation of a corresponding signal. The trigger switch 60 may also be a button switch, and the action portion on the nut block directly contacts the corresponding trigger switch, causing the corresponding trigger switch to trigger and emit an electrical signal.

[0028] In this embodiment, the screw 40 may be fixedly connected to the end of the reel main shaft 13. When the reel 10 pays off the line and rotates one circle, the screw 40 also rotates one circle, and the nut block 50 moves a distance of a screw pitch toward the trigger switch 60. Correspondingly, when the reel 10 reels the line and rotates one circle, the screw 40 also rotates one circle, and the nut block 50 moves a distance of a screw pitch away from the trigger switch 60. The screw 40 and the reel main shaft 13 may also be connected by a transmission gear. The transmission ratio of the transmission gear is set according to the situation, so that when the reel reels and pays off the line and rotates one circle, the nut block moves a distance corresponding to the transmission ratio times the pitch.

[0029] In this embodiment, the bracket 30 may be in the shape of a U-shaped bending plate, the nut block 50 is arranged between the bending plates on both sides of the bracket 30, the first side bending plate 31 of the bracket 30 is fixedly connected to the reel housing 11, the second side bending plate 32 of the bracket 30 is directly opposite to the axial end of the nut block 50, and the trigger switch 60 is fixed on the second side bending plate 32. An axial slide groove is provided on the surface of the nut block 50, and the guide portion 33 is in the shape of a plate, which is fixed between the first side bending plate 31 and the second side bending plate 32, and the guide portion 33 has a guiding straight edge arranged in the axial slide groove.

[0030] In this embodiment, the guide portion 33 may also be one, two or more guide rods axially penetrating the nut block and having ends fixedly connected to the bracket. The guide rods prevent the nut block from rotating circumferentially, and when the screw rod 40 rotates, the nut block 50 moves axially in a horizontal motion.

[0031] This embodiment also provides a towing engineering machine, which can be an electric excavator or an electric transfer machine, etc. The towing engineering machine includes a cable retracting drum for retracting and releasing the towing cable and the aforementioned drum release alarm trigger device 20, and the trigger switch 60 is electrically connected to the cable retracting and releasing control system.

[0032] The reel pay-off alarm trigger device in this embodiment has a simple structure, low cost and reliable performance.

Claims

1. A reel pay-off alarm trigger device, characterized in that: include: A bracket fixedly mounted on the drum housing, a screw rod drivingly connected to the drum main shaft, a nut block threadably connected to the screw rod, a guide portion fixed on the bracket and used to limit the circumferential rotation of the nut block, and a trigger switch fixed on the bracket and facing the axial end of the nut block; The threads of the screw rod and the nut block are configured so that when the reel rotates to release the line, the nut block moves toward the trigger switch, and when the reel rotates to the number of turns of the line release alarm, the nut block triggers the trigger switch.

2. The reel pay-off alarm trigger device according to claim 1, characterized in that: There are two trigger switches and they are configured to be triggered successively by the nut blocks when the nut block moves toward the direction of the trigger switch.

3. The reel pay-off alarm trigger device according to claim 2, characterized in that: The trigger switch is a proximity switch or a button switch.

4. The reel pay-off alarm trigger device according to claim 1, characterized in that The screw is fixedly connected to the end of the reel main shaft.

5. The reel pay-off alarm trigger device according to claim 1 is characterized in that The screw rod is connected to the end of the reel main shaft through a transmission gear.

6. The reel pay-off alarm trigger device according to any one of claims 1 to 5, characterized in that: The guide portion is at least one guide rod which axially penetrates the nut block and whose end is fixedly connected to the bracket.

7. The reel pay-off alarm trigger device according to any one of claims 1 to 5, characterized in that: The bracket is in the shape of a U-shaped bent plate, the nut block is arranged between the bent plates on both sides of the bracket, the first side bent plate of the bracket is fixedly connected to the reel shell, the second side bent plate of the bracket is opposite to the axial end of the nut block, and the trigger switch is fixed on the second side bent plate.

8. The reel pay-off alarm trigger device according to claim 7, characterized in that: An axial sliding groove is arranged on the surface of the nut block, and the guide portion is composed of a plate fixed on the bracket and having a guiding straight edge arranged in the axial sliding groove.

9. The reel pay-off alarm triggering device according to claim 2 or 3, characterized in that: The trigger parts of the two trigger switches and the nut block are flush in the axial direction of the nut block; the distance between the two acting parts on the nut block corresponding to the trigger parts of the two trigger switches in the axial direction of the nut block is 0.5 to 2 times the pitch of the screw, and the screw is fixedly connected to the end of the reel main shaft.

10. A towing engineering machine, comprising a cable reel for retracting and releasing a towing cable, characterized in that: It also includes the reel pay-out alarm trigger device according to any one of claims 1 to 9, and the trigger switch is electrically connected to the cable retraction and release control system.

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