CN218478468U - Stay cord type height limit switch - Google Patents
Stay cord type height limit switch Download PDFInfo
- Publication number
- CN218478468U CN218478468U CN202221487826.1U CN202221487826U CN218478468U CN 218478468 U CN218478468 U CN 218478468U CN 202221487826 U CN202221487826 U CN 202221487826U CN 218478468 U CN218478468 U CN 218478468U
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- pull rod
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- spring
- limit switch
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Abstract
A pull rope type height limit switch comprises a shell, a movable pull rod and a detection device, wherein the movable pull rod and the detection device are clamped in the shell; the anti-overload device comprises an anti-overload sleeve and a locking screw arranged on the anti-overload sleeve, the pull rope penetrates through the anti-overload sleeve, the tail end of the pull rope is clamped in the anti-overload sleeve in a clamping mode to form an annular structure, and the anti-overload sleeve locks the pull rope through the locking screw. The utility model can avoid the movable pull rod from being impacted to the maximum extent by completely arranging the movable pull rod in the shell, thus solving the problem that the detection device is blocked and fails because the movable pull rod is deformed by the impact; through overload prevention device, make the stay cord repeatedly fixable, solve high limit switch because the stay cord is pulled apart and the problem that damages the inefficacy.
Description
Technical Field
The utility model relates to a hoist control technical field, concretely relates to high limit switch of stay cord formula.
Background
The height limit switch is an essential safety component in a crane control system and is used for preventing a lifting hook from lifting to the top of a suspension arm to cause a safety accident or damage to the crane; the height limit switch is usually arranged at the head of the suspension arm and is connected with a heavy hammer through a chain or a steel wire rope; when the crane hook is below the safety warning height, the heavy hammer is in a suspension state, and pulls the height limit switch by the heavy hammer depending on the self gravity; when the crane hook rises to reach the safety warning height and supports the heavy hammer, the height limit switch rebounds, the crane control system detects the signal change of the height limit switch, the output signal stops winding, and the hook stops rising.
The existing height limit switch has two types, namely a pull rod type and a pull rope type.
The movable pull rod of the conventional pull rod type height limit switch is exposed, a through hole or a mounting metal ring is arranged at the head of the pull rod and used for connecting a chain or a steel wire rope, and the movable pull rod of the height limit switch is easily deformed due to collision in the operation process because the movable pull rod is exposed, so that the height limit switch is blocked and fails.
In the existing pull-rope type height-limiting switch, the tail end of the pull rope is usually wound into a ring shape by adopting a compression joint or welding mode and is used for connecting a chain or a steel wire rope, and when the chain or the steel wire rope for connecting the height-limiting switch and the heavy hammer is wound with a hoisting steel cable in the operation process, the pull rope is pulled apart when the stress exceeds the limit, so that the height-limiting switch is damaged and fails.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, overcome the above-mentioned defect that prior art exists, provide one kind and avoid high limit switch to receive external impact or weight wire rope to receive the pulling force too big and lead to high limit switch to damage the inefficacy at hoist operation in-process to improve equipment security reduces the high limit switch of stay cord formula of equipment fault rate.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a stay cord formula height limit switch, includes the casing to and clamp movable pull rod and detection device in the casing, the one end of movable pull rod is connected with the detection device who detects whether the movable pull rod stimulates, and the other end is connected with the stay cord that runs through the casing, the end of stay cord is equipped with anti-overload device.
Furthermore, the overload protection device comprises an overload protection sleeve and a locking screw arranged on the overload protection sleeve, the pull rope penetrates through the overload protection sleeve, the tail end of the pull rope is clamped in the overload protection sleeve in a sleeved mode to form an annular structure, and the overload protection sleeve locks the pull rope through the locking screw.
Further, the detection device comprises a microswitch and a rebound device which are arranged in the shell, wherein the rebound device enables the movable pull rod to press a button of the microswitch when not pulled and to be separated from the button when pulled.
Furthermore, resilient means includes spring holder and spring, be equipped with the spring chamber that holds spring holder and spring in the casing, the activity pull rod is located to the spring holder, spring one end and spring seat connection, the other end card cover in the one end of the activity pull rod of being connected with the stay cord, and the wall body contact through bolster and spring chamber.
Further, the buffer piece is an anti-collision pad.
Furthermore, the shell is clamped with a guide sleeve, the guide sleeve can movably clamp a pull rope, and the outer end of the guide sleeve is a trumpet-shaped opening.
The utility model has the advantages that the movable pull rod is completely arranged in the shell, so that the movable pull rod is prevented from being impacted to the maximum extent, and the problem that the detection device is blocked and fails due to the deformation of the movable pull rod caused by the impact is solved; the pull rope can be fixed repeatedly through the overload prevention device, and the problem that the height limit switch is damaged and fails due to the fact that the pull rope is broken is solved; the crane can be widely applied to various hoisting equipment such as automobile cranes, wheel cranes, crawler cranes, port cranes and the like; the height limit switch can be effectively prevented from being damaged and losing efficacy due to the fact that the height limit switch is impacted by external force or a heavy hammer steel wire rope is too large in tension, the reliability of the height limit switch is improved, the safety coefficient of hoisting equipment is improved, and the equipment maintenance rate is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the drawings: 1. an upper housing; 2. a movable pull rod; 3. a spring; 4. a crash pad; 5. a guide sleeve; 6. pulling a rope; 7. locking screws; 8. an overload prevention sleeve; 9. a lower housing; 10. a microswitch; 11. a locking head.
Detailed Description
The following embodiments are described in detail with reference to the following examples:
as shown in fig. 1, an embodiment of a pull-cord type height-limiting switch includes a housing, a movable pull-cord 2 and a detection device, the movable pull-cord 2 and the detection device are clamped in the housing, one end of the movable pull-cord 2 is connected to the detection device for detecting whether the movable pull-cord 2 is pulled, the other end of the movable pull-cord is connected to a pull-cord 6 penetrating through the housing, and an overload protection device is disposed at the end of the pull-cord 6. The movable pull rod 2 is completely arranged in the shell, so that the movable pull rod 2 is prevented from being impacted from the outside to the greatest extent, and the problem that the detection device is locked and fails due to the fact that the movable pull rod 2 is impacted and deformed is solved; through the overload protection device, the pull rope can be fixed repeatedly, and the problem that the height limit switch is damaged and fails due to the fact that the pull rope 6 is pulled apart is solved.
The movable pull rod 2 is contacted with the shell and can generate relative friction at the part, and the friction force is reduced through reasonable surface treatment, lubrication treatment and clearance fit, so that the movable pull rod 2 can freely slide in the shell.
The casing includes casing 1 and lower casing 9, and through bolt or rivet fixed connection, is the aluminum alloy material, and outward appearance spraying plastics is handled, has good guard action to inside spare part, has advantages such as low cost, easily processing, rust-resistant simultaneously.
The microswitch 10 is a waterproof microswitch.
The anti-overload device comprises an anti-overload sleeve 8 and a locking screw 7 arranged on the anti-overload sleeve 8, the pull rope 6 penetrates through the anti-overload sleeve 8, the tail end of the pull rope is clamped in the anti-overload sleeve 8 in a sleeved mode to form an annular structure, and the anti-overload sleeve 8 locks the pull rope 6 through the locking screw 7. The tightening torque value of the locking screw 7 can be adjusted and determined according to the limit tension value of the steel wire rope adopted by the pull rope 6, so that the locking force of the steel wire rope is smaller than the bearable limit tension value of the steel wire rope; when the external pulling force exceeds the locking force, the tail end of the pull rope 6 can be pulled out of the overload prevention sleeve 8, so that the pull rope is prevented from being broken and damaged; then, the end of the pull rope 6 can be threaded into the overload prevention sleeve 8 again, and the locking screw 7 is screwed down by using the specified torque, so that the device can be used continuously.
The detection means comprise a microswitch 10 and a rebounding device provided in the casing, which allows the mobile tie-rod 2 to press the push-button of the microswitch 10 when not pulled, and to separate from the push-button when pulled. The microswitch 10 can be ensured to work normally through the rebound device; the microswitch 10 is a waterproof microswitch, a locking head 11 is arranged on the shell, and the locking head 11 is used for fixing a cable connected with the microswitch 10; when the lifting hook of the crane is below the safety warning height, the heavy hammer connected with the tail end of the pull rope 6 is in a suspension state, the heavy hammer pulls the pull rope 6 by means of the self gravity and then pulls the movable pull rod 2, the button of the microswitch 10 is separated from the movable pull rod 2, and the microswitch 10 outputs a group of signals; when the lifting hook of the crane rises to reach the safety warning height and supports the heavy hammer, the pull rope 6 is not pulled by the heavy hammer, the movable pull rod 2 is rebounded to a non-pulling state under the action of the elastic force of the spring 3, the button of the micro switch 10 is pressed by the movable pull rod 2, the output signal of the micro switch 10 changes, the control system of the crane detects the signal change of the micro switch 10, the output signal stops the hoisting of the crane, the lifting hook stops rising, and the height limiting function is realized.
The rebounding device comprises a spring seat and a spring 3, a spring cavity for containing the spring seat and the spring 3 is formed in the shell, the spring seat is arranged on the movable pull rod 2, one end of the spring 3 is connected with the spring seat, the other end of the spring is sleeved with the clamp sleeve at one end of the movable pull rod 2 connected with the pull rope 6, and the spring seat is in contact with the wall body of the spring cavity through the buffer piece. The spring 3 can well realize the rebound of the movable pull rod 2.
The buffer piece is an anti-collision pad. The wall body of the spring cavity contacting with the spring 3 can be protected through the anti-collision pad, and the service life is prolonged.
The shell is clamped with a guide sleeve 5, the guide sleeve 5 is movably clamped with a pull rope 6, and the outer end of the guide sleeve 5 is a trumpet-shaped opening. The contact surface of the guide sleeve 5 and the pull rope 6 is smooth, so that the friction force is reduced, and the pull rope 6 can still pull the movable pull rod 2 when being bent within the range of 0-180 degrees through the guide sleeve 5.
Those not described in detail in the specification are well within the skill of the art.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as within the protection scope of the present invention.
Claims (6)
1. A pull rope type height limit switch is characterized by comprising a shell, a movable pull rod (2) and a detection device, wherein the movable pull rod (2) and the detection device are clamped in the shell, one end of the movable pull rod (2) is connected with the detection device which detects whether the movable pull rod (2) is pulled, the other end of the movable pull rod is connected with a pull rope (6) which penetrates through the shell, and an overload prevention device is arranged at the tail end of the pull rope (6).
2. The pull-rope-type height limit switch according to claim 1, wherein the overload prevention device comprises an overload prevention sleeve (8) and a locking screw (7) arranged on the overload prevention sleeve (8), the pull rope (6) passes through the overload prevention sleeve (8) and the tail end of the pull rope is clamped in the overload prevention sleeve (8) to form a ring-shaped structure, and the overload prevention sleeve (8) locks the pull rope (6) through the locking screw (7).
3. A pull-cord type height limit switch according to claim 1, characterized in that the detection means comprise a micro switch (10) arranged in the housing and a resilient means which causes the movable pull-rod (2) to press the push-button of the micro switch (10) when not pulled and to disengage from the push-button when pulled.
4. The pull-rope-type height limit switch according to claim 3, wherein the rebounding device comprises a spring seat and a spring (3), the housing is provided with a spring cavity for accommodating the spring seat and the spring (3), the spring seat is arranged on the movable pull rod (2), one end of the spring (3) is connected with the spring seat, and the other end of the spring (3) is clamped at one end of the movable pull rod (2) connected with the pull rope (6) and is in contact with the wall body of the spring cavity through a buffer member.
5. The pull-cord height-limited switch according to claim 4, wherein the bumper is a crash pad.
6. The pull-cord type height-limiting switch according to claim 1, wherein the housing is clamped with a guide sleeve (5), the guide sleeve (5) is movably clamped with a pull cord (6), and the outer end of the guide sleeve is in a trumpet-shaped opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221487826.1U CN218478468U (en) | 2022-06-14 | 2022-06-14 | Stay cord type height limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221487826.1U CN218478468U (en) | 2022-06-14 | 2022-06-14 | Stay cord type height limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218478468U true CN218478468U (en) | 2023-02-14 |
Family
ID=85163969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221487826.1U Active CN218478468U (en) | 2022-06-14 | 2022-06-14 | Stay cord type height limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218478468U (en) |
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2022
- 2022-06-14 CN CN202221487826.1U patent/CN218478468U/en active Active
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