Alarm limiting device applied to crawler crane

Abstract

The utility model discloses an alarm limiting device applied to a crawler crane. The alarm limiting device comprises a limiting switch assembly and a limiting stop block assembly, the limit switch assembly is electrically connected with the alarm, a rotation control mechanism in the crawler crane and the power supply to form a control circuit; and the limiting stop block assembly can be matched with the limiting switch assembly, so that the alarm can give an alarm when the crawler crane is close to and exceeds a safe rotation range, and the crawler crane can stop rotating before the crawler crane exceeds the safe rotation range. The alarm device is reasonable in structure, low in manufacturing cost, convenient to install and high in practicability, and when the slewing mechanism in the crawler crane is close to and exceeds a safe rotation range, the alarm device can give an alarm sound to remind workers. If a worker does not take measures under the alarm sound, when the slewing mechanism continues to rotate, the slewing mechanism can stop rotating before the slewing mechanism exceeds a safe rotating range, and the use safety of the crawler crane can be improved.

Description

Technical Field

[0001] The utility model relates to an alarm limit device, in particular to an alarm limit device applied to a crawler crane. Background Art

[0002] Crawler crane is a full-revolving jib crane with a crawler walking mechanism. This crawler crane can move smoothly on a variety of terrains and can also rotate 360 ​​degrees in all directions. It is very suitable for lifting operations on uneven construction sites such as soft soil and loose gravel.

[0003] Existing crawler cranes usually include crawler traveling mechanism, slewing mechanism, rear counterweight mechanism, superlift counterweight mechanism, fuselage and boom. The slewing mechanism is an important component for crawler cranes to achieve 360-degree slewing. Figure 1 As shown, the slewing mechanism includes a lower support 1, a slewing bearing 2 rotatably arranged on the top of the lower support 1, and an upper turntable 3 fixed on the slewing bearing 2. In actual work, there are usually working obstacles in the working area of ​​the crawler crane, and there is a risk of collision with surrounding working obstacles on the crane arm, rear counterweight mechanism, super-lift counterweight mechanism and other parts of the crawler crane. Therefore, when the crawler crane is operating, it is necessary to limit the rotation area of ​​the crawler crane to a safe rotation range to prevent collision with working obstacles. At present, the main measure to limit the rotation area of ​​the crawler crane to a safe rotation range is to rely on the visual monitoring of the crawler crane operator and the lifting commander. When relying on manual visual monitoring, it is easy to cause collision accidents due to factors such as unclear vision, obstructed vision and lack of concentration of the staff, which will seriously affect the safety of the crawler crane operation. Summary of the invention

[0004] In order to solve the above deficiencies in the prior art, the utility model aims to provide an alarm limit device applied to a crawler crane, so as to achieve the purpose of improving the safety of use.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: an alarm limit device applied to a crawler crane, comprising a normally open limit switch assembly fixed at the bottom of an upper turntable and a limit stop block assembly fixed at the top of a lower supporting side surface and capable of contacting with a contact in the limit switch assembly; the limit switch assembly is electrically connected to an alarm, a rotation control mechanism in the crawler crane, and a power supply to form a control circuit, wherein the control circuit is composed of an alarm circuit and a stop rotation circuit; the limit stop block assembly can cooperate with the limit switch assembly to control the connection or closing of the alarm circuit so that the alarm of the crawler crane sounds an alarm when the crawler crane is about to exceed a safe rotation range; when the crawler crane continues to rotate after the alarm sounds an alarm, the limit stop block assembly can cooperate with the limit switch assembly to control the connection or closing of the stop rotation circuit so that the crawler crane stops rotating before exceeding the safe rotation range.

[0006] As a limitation of the present invention, the limit switch assembly includes a base fixed to the bottom of the upper turntable and a vertical plate fixed to the bottom of the base, wherein an inner coil spring limit switch and an outer coil spring limit switch are respectively fixed on two opposite sides of the vertical plate.

[0007] As another limitation of the present invention, the limit stop assembly includes a left limit stop fixed on the top of the lower supporting side and located on the left side of the limit switch assembly, and a right limit stop fixed on the top of the lower supporting side and located on the right side of the limit switch assembly.

[0008] As a further definition of the present invention, the left limit block includes a first connecting seat fixed on the top of the lower supporting side and a first mounting plate vertically fixed at the lower end of the first connecting seat, wherein a first inner limit plate is fixed on the side of the short side on the left side of the top of the first mounting plate close to the first connecting seat, and a first outer limit plate is fixed on the side of the short side on the right side of the top of the first mounting plate away from the first connecting seat.

[0009] As a further limitation of the present invention, the right limit block includes a second connecting seat fixed on the top of the lower supporting side and a second mounting plate vertically fixed at the lower end of the second connecting seat, a second inner limit plate is fixed on the side of the short side on the right side of the top of the second mounting plate close to the second connecting seat, and a second outer limit plate is fixed on the side of the short side on the left side of the top of the second mounting plate away from the second connecting seat.

[0010] As a further limitation of the present invention, the base, the first connecting seat and the second connecting seat are all made of magnets.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0012] (1) The utility model adopts a structural form that combines a limit switch assembly, a limit stop block assembly, a power supply, and an alarm, wherein the limit switch assembly is electrically connected to the alarm, the rotation control mechanism in the crawler crane, and the power supply to form a control circuit, and the control circuit has the function of controlling the alarm and stopping the rotation of the slewing mechanism in the crawler crane. When the crawler crane is in a safe rotation range, the limit switch assembly is in a normally open state, at which time the alarm circuit and the rotation stop circuit are both in a disconnected state. When the crawler crane is about to exceed the safe rotation range, the limit switch assembly will touch the limit stop block assembly, at which time the alarm circuit is in a connected state, and the alarm can emit an alarm sound to remind the staff to pay attention. When the crawler crane continues to rotate after the alarm sounds, the limit switch assembly will touch the limit block assembly again. At this time, the stop rotation circuit is in a connected state, and the rotation control mechanism in the crawler crane can stop the slewing mechanism from rotating. The utility model can first send out an alarm sound to remind the staff before the slewing mechanism exceeds the safe rotation range, and then force the slewing mechanism to stop rotating, which can avoid the occurrence of collision accidents and effectively improve the safety of the crawler crane.

[0013] (2) The coil spring limit switch used in the limit switch assembly of the utility model is a standard part, which is easy to purchase and has high reliability in controlling the alarm circuit and the stop rotation circuit.

[0014] (3) The limit stopper assembly of the utility model comprises a left limit stopper and a right limit stopper. When in use, the left limit stopper is fixedly arranged at the top of the lower supporting side surface and is located on the left side of the limit switch assembly, and the right limit stopper is fixedly arranged at the top of the lower supporting side surface and is located on the right side of the limit switch assembly. The range between the outer side of the left limit stopper and the outer side of the right limit stopper is the safe rotation range of the slewing mechanism. When working, when the limit switch assembly rotates between the left limit stopper and the right limit stopper, the alarm circuit and the stop rotation circuit are both in the disconnected state. When the limit switch assembly rotates to the left, the outer disc spring limit switch in the limit switch assembly touches the first outer limit plate in the left limit block, the alarm circuit is in a connected state, and the alarm can sound an alarm to remind the staff to pay attention. When the limit switch assembly continues to rotate to the left, the inner disc spring limit switch in the limit switch assembly touches the first inner limit plate in the left limit block, and the stop rotation circuit is in a connected state at this time, and the rotation control mechanism in the crawler crane can stop the rotation of the slewing mechanism. Similarly, when the limit switch assembly rotates to the right, the utility model also first alarms and then forces the slewing mechanism to stop rotating, which can effectively improve the safety of the crawler crane.

[0015] (4) The base, the first connecting seat and the second connecting seat in the utility model are all made of magnets, and the upper turntable and the lower support in the crawler crane are all made of iron materials. When installing the utility model, it is only necessary to suck the base, the first connecting seat and the second connecting seat into the corresponding positions in the crawler crane. The installation is convenient, which can effectively improve the convenience and practicality of the installation of the utility model.

[0016] In summary, the utility model has a reasonable structure, low manufacturing cost, convenient installation and strong practicality. The utility model has two functions. The first function is an alarm function. When the slewing mechanism in the crawler crane is close to exceeding the safe rotation range, the alarm circuit is connected, and the alarm can emit an alarm sound to remind the staff. The second function is a stop rotation function. If the staff does not take measures under the alarm sound, and the slewing mechanism continues to rotate, the stop rotation circuit is connected, and the slewing mechanism is stopped before exceeding the safe rotation range through the rotation control mechanism in the crawler crane, which can effectively avoid the occurrence of collision accidents, thereby improving the safety of the crawler crane. The utility model is suitable for installation on a crawler crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a structural schematic diagram of a slewing mechanism in an existing crawler crane;

[0019] Figure 2 It is a schematic diagram of the structure of an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the installation position of an embodiment of the utility model;

[0021] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0022] Figure 5 This is a connection diagram of the control circuit in the embodiment of the utility model;

[0023] In the figure: 1. Lower support; 2. Slewing bearing; 3. Upper turntable;

[0024] 4. Limit switch assembly; 41. Base; 42. Vertical plate; 43. Inner coil spring type limit switch; 44. Outer coil spring type limit switch;

[0025] 5. left limit stopper; 51. first connecting seat; 52. first mounting plate; 53. first inner limit plate; 54. first outer limit plate;

[0026] 6. right limit stopper; 61. second connecting seat; 62. second mounting plate; 63. second inner limit plate; 64. second outer limit plate;

[0027] 7. Power supply; 8. Alarm; 9. Rotation control mechanism. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0029] Embodiment An alarm limit device applied to a crawler crane

[0030] like Figure 2 As shown, this embodiment includes a normally open limit switch assembly 4 fixedly mounted on the bottom of the upper turntable 3 and a limit stopper assembly fixedly mounted on the top of the side surface of the lower support 1 and capable of contacting with the contact in the limit switch assembly 4 .

[0031] The limit switch assembly 4 includes a base 41 fixed on the bottom of the upper turntable 3 and a vertical plate 42 fixed on the bottom of the base 41, wherein an inner coil spring limit switch 43 and an outer coil spring limit switch 44 are respectively fixed on two opposite sides of the vertical plate 42, wherein the base 41 is made of a magnet, the inner coil spring limit switch 43 and the outer coil spring limit switch 44 are both existing coil spring limit switches, and the four corners of the inner coil spring limit switch 43 are fixed to the vertical plate 42 by four bolts, and similarly, the four corners of the outer coil spring limit switch 44 are fixed to the vertical plate 42 by four bolts.

[0032] The limit stopper assembly includes a left limit stopper 5 for fixing on the top of the side of the lower support 1 and located on the left side of the limit switch assembly 4, and a right limit stopper 6 for fixing on the top of the side of the lower support 1 and located on the right side of the limit switch assembly 4. Specifically, in the present embodiment, the left limit stopper 5 includes a first connection seat 51 for fixing on the top of the side of the lower support 1 and a first mounting plate 52 fixed vertically on the lower end of the first connection seat 51, wherein a first inner limit plate 53 is fixed on the side of the short side on the left side of the top of the first mounting plate 52 close to the first connection seat 51, and a first outer limit plate 54 is fixed on the side of the short side on the right side of the top of the first mounting plate 52 away from the first connection seat 51. Specifically, in the present embodiment, the first connection seat 51 is an arc-shaped magnet block, and the curvature of the first connection seat 51 is adapted to the curvature of the top of the side of the lower support 1 so that the first connection seat 51 can be firmly fixed on the top of the side of the lower support 1. When the limit switch assembly 4 rotates to the left, the outer disc spring limit switch 44 in the limit switch assembly 4 first rotates to touch the first outer limit plate 54, at which time the inner disc spring limit switch 43 in the limit switch assembly 4 does not touch the left limit block 5. When the limit switch assembly 4 continues to rotate to the left, the inner disc spring limit switch 43 in the limit switch assembly 4 rotates to touch the first inner limit plate 53, at which time the outer disc spring limit switch 44 in the limit switch assembly 4 does not touch the left limit block 5. The right limit block 6 includes a second connection seat 61 fixedly mounted on the top of the side of the lower support 1 and a second mounting plate 62 vertically fixedly mounted on the lower end of the second connection seat 61. A second inner limit plate 63 is fixedly mounted on the side of the short side on the right side of the top of the second mounting plate 62 close to the second connection seat 61, and a second outer limit plate 64 is fixedly mounted on the side of the short side on the left side of the top of the second mounting plate 62 away from the second connection seat 61. Specifically, in this embodiment, the second connection seat 61 is an arc-shaped magnet block, and the curvature of the second connection seat 61 is adapted to the curvature of the top of the side surface of the lower support 1 so that the second connection seat 61 can be firmly fixed on the top of the side surface of the lower support 1. When the limit switch assembly 4 rotates to the right, the outer disc spring limit switch 44 in the limit switch assembly 4 first rotates to touch the second outer limit plate 64, and the inner disc spring limit switch 43 in the limit switch assembly 4 does not touch the right limit block 6. When the limit switch assembly 4 continues to rotate to the right, the inner disc spring limit switch 43 in the limit switch assembly 4 will rotate to touch the second inner limit plate 63, and the outer disc spring limit switch 44 in the limit switch assembly 4 does not touch the right limit block 6.

[0033] The present embodiment also includes an alarm 8 and a power supply 7. The limit switch assembly 4 is electrically connected to the alarm 8, the rotation control mechanism 9 in the crawler crane, and the power supply 7 to form a control circuit, wherein the control circuit is composed of an alarm circuit and a stop rotation circuit. The limit block assembly can cooperate with the limit switch assembly 4 to control the connection or closing of the alarm circuit so that the alarm 8 will sound an alarm when the crawler crane is about to exceed the safe rotation range. When the crawler crane continues to rotate after the alarm 8 sounds the alarm, the limit block assembly can cooperate with the limit switch assembly 4 to control the connection or closing of the stop rotation circuit so that the crawler crane stops rotating before exceeding the safe rotation range. Specifically, in the present embodiment, the alarm 8 adopts an audible and visual alarm, and the alarm 8 needs to be fixed in the cab of the crawler crane. The control circuit is as follows Figure 5 As shown, the outer disc spring limit switch 44 is connected in series with the alarm 8 and then connected to the power supply 7 to form an alarm circuit, and the inner disc spring limit switch 43 is connected in series with the rotation control mechanism 9 in the crawler crane and then connected to the power supply 7 to form a rotation stop circuit. It needs to be further explained that the position of the first inner limit plate 53 in the left limit block 5 is the maximum position of the crawler crane to rotate to the left, that is, the maximum value on the left side of the safe rotation range, that is, the position where the slewing mechanism stops rotating in this embodiment, and the position of the first outer limit plate 54 in the left limit block 5 is the position where the crawler crane is close to exceeding the safe rotation range when rotating to the left, that is, the position where the alarm is issued in this embodiment. Similarly, the position of the second inner limit plate 63 in the right limit block 6 is the maximum position of the crawler crane to rotate to the right, that is, the maximum value on the right side of the safe rotation range, that is, the position where the slewing mechanism stops rotating in this embodiment, and the position of the second outer limit plate 64 in the right limit block 6 is the position where the crawler crane is close to exceeding the safe rotation range when rotating to the right, that is, the position where the alarm is issued in this embodiment.

[0034] The installation method of this embodiment is as follows: Figure 3 , Figure 4 As shown, the safe rotation range of the crawler crane is determined according to the actual situation at the construction site, and then the base 41 in the limit switch assembly 4 is fixedly mounted on the bottom of the upper turntable 3, and then the left limit block 5 is fixedly mounted on the top of the side of the lower support 1 at a suitable position on the left side of the limit switch assembly 4, and it is necessary to make the first outer limit plate 54 in the left limit block 5 closer to the limit switch assembly 4 than the first inner limit plate 53, and finally the right limit block 6 is fixedly mounted on the top of the side of the lower support 1 at a suitable position on the right side of the limit switch assembly 4, and it is necessary to make the first outer limit plate 54 in the right limit block 6 closer to the limit switch assembly 4 than the first inner limit plate 53.

[0035] The working principle of this embodiment is as follows: the limit switch assembly 4 is fixed on the bottom of the upper turntable 3, so the limit switch assembly 4 can rotate synchronously with the upper turntable 3. When the limit switch assembly 4 rotates between the left limit block 5 and the right limit block 6, the alarm circuit and the stop rotation circuit are both in a disconnected state. When the limit switch assembly 4 rotates to the left, the outer disc spring limit switch 44 in the limit switch assembly 4 touches the first outer limit plate 54 in the left limit block 5, the alarm circuit is in a connected state, and the alarm 8 can emit an alarm sound to remind the staff to pay attention. When the limit switch assembly 4 continues to rotate to the left, the inner disc spring limit switch 43 in the limit switch assembly 4 touches the first inner limit plate 53 in the left limit block 5, and the stop rotation circuit is in a connected state at this time, and the rotation control mechanism 9 in the crawler crane can stop the rotation of the slewing mechanism. Similarly, when the limit switch assembly 4 rotates to the right, this embodiment also first alarms and then forces the slewing mechanism to stop rotating.

[0036] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An alarm limit device applied to a crawler crane, characterized in that: It includes a normally open limit switch assembly fixed at the bottom of the upper turntable and a limit stopper assembly fixed at the top of the lower support side surface and capable of contacting with the contact in the limit switch assembly; the limit switch assembly is electrically connected with the alarm, the rotation control mechanism in the crawler crane, and the power supply to form a control circuit, wherein the control circuit is composed of an alarm circuit and a rotation stop circuit; The limit stopper assembly can cooperate with the limit switch assembly to control the connection or closing of the alarm circuit so that the crawler crane alarm will sound when it is close to exceeding the safe rotation range; When the crawler crane continues to rotate after the alarm sounds, the limit stopper assembly can cooperate with the limit switch assembly to control the connection or closing of the rotation stop circuit so that the crawler crane stops rotating before exceeding the safe rotation range.

2. The alarm limit device for crawler crane according to claim 1 is characterized in that: The limit switch assembly includes a base fixed on the bottom of the upper turntable and a vertical plate fixed on the bottom of the base, wherein an inner coil spring limit switch and an outer coil spring limit switch are respectively fixed on two opposite sides of the vertical plate.

3. The alarm limit device for crawler crane according to claim 2 is characterized in that: The limit stopper assembly comprises a left limit stopper fixedly arranged on the top of the lower supporting side and located on the left side of the limit switch assembly, and a right limit stopper fixedly arranged on the top of the lower supporting side and located on the right side of the limit switch assembly.

4. The alarm limit device for crawler crane according to claim 3 is characterized in that: The left limit stop block includes a first connecting seat fixed on the top of the lower supporting side surface and a first mounting plate vertically fixed at the lower end of the first connecting seat, wherein a first inner limit plate is fixed on the side of the short side on the left side of the top of the first mounting plate close to the first connecting seat, and a first outer limit plate is fixed on the side of the short side on the right side of the top of the first mounting plate away from the first connecting seat.

5. The alarm limit device for crawler crane according to claim 4 is characterized in that: The right limit stop block includes a second connecting seat fixedly mounted on the top of the lower supporting side surface and a second mounting plate vertically fixedly mounted at the lower end of the second connecting seat, a second inner limit plate is fixedly mounted on a side of the short side on the right side of the top of the second mounting plate close to the second connecting seat, and a second outer limit plate is fixedly mounted on a side of the short side on the left side of the top of the second mounting plate away from the second connecting seat.

6. The alarm limit device for crawler crane according to claim 5, characterized in that: The base, the first connecting seat and the second connecting seat are all made of magnets.

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