CN219669867U - Trigger assembly of limit switch and safety protection device of tower lifter - Google Patents

Abstract

The utility model relates to the field of automatic control, in particular to a trigger assembly of a limit switch and a safety protection device of a tower crane. The trigger assembly of the limit switch provided by the utility model comprises: the device comprises a mounting piece, a detecting piece, a triggering piece and an elastic resetting piece, wherein the elastic resetting piece is sleeved on the detecting piece and limited by the detecting piece and the mounting piece, when the detecting piece is stressed to move towards one end of the limit switch, the elastic resetting piece is compressed so as to apply resetting elastic force opposite to the moving direction to the detecting piece, and the triggering piece is caused to reset, so that the resetting reliability of the limit switch is improved. The trigger assembly provided by the utility model is applied to the protection device of the tower crane, so that the reliability of the safety protection device can be effectively improved.

Description

Trigger assembly of limit switch and safety protection device of tower lifter

Technical Field

The utility model relates to the field of automatic control, in particular to a trigger assembly of a limit switch and a safety protection device of a tower crane.

Background

The tower lifter is generally arranged in the tower of the fan, and is used for conveying workers, tools or materials to an upper-layer platform or a cabin, and can be stopped at any position in the tower at any time to carry out overhaul and maintenance work. The tower drum lifter is similar to an elevator, adopts a driving machine and a steel cable to drive the elevator car to move up and down, is matched with a guide mechanism to ensure the stability of the elevator car during the lifting and is matched with various safety protection devices to realize emergency braking under dangerous conditions. The safety protection device comprises a lower profile triggering device for realizing a lower profile protection function, and is used for detecting an obstacle in a running channel in the running process of the car so as to avoid accidents caused by touching the obstacle and effectively protect the safety of objects or workers below. The safety protection device further comprises a lower limit trigger device for realizing a lower limit protection function, the lower limit trigger device can avoid the danger of bottom flushing, and the tower crane and the load carrying person or object thereof are prevented from being damaged.

The existing lower profile triggering device detects obstacles in a running channel generally through a lower profile plate hung below a car bottom plate, and when the lower profile plate touches the obstacles, a limit switch is triggered to act so as to stop the running of the tower crane. The lower limit trigger device detects whether the lower limit is reached through a detection piece at a position lower than the lower contour plate, and when the detection piece is propped against the ground or an obstacle, the limit switch is triggered to act so as to stop the operation of the tower lifter.

Whatever application scenario, when the tower crane resumes operation and descends again, if limit switch does not reset, then lower profile protection function or lower limit protection function are inefficacy is led to, this can bring very big potential safety hazard for the operation of tower crane. This problem is also present in other protection devices that employ limit switches.

Disclosure of Invention

Aiming at the problem of resetting reliability of a limit switch, the utility model provides a trigger assembly of the limit switch and a safety protection device of a tower crane, which are used for improving the resetting reliability of the limit switch, thereby improving the reliability of the safety protection device.

The utility model provides a trigger component of a limit switch, which is used for a safety protection device of a tower crane, wherein the safety protection device comprises the limit switch, and the trigger component comprises: mounting, detecting element, trigger piece and elasticity restoring element, wherein:

the detection piece is movably arranged in the mounting piece in a penetrating way, one end of the detection piece is fixedly connected with the trigger piece, and the other end of the detection piece extends out of the mounting piece by a set length;

the trigger piece is lapped on the mounting piece and is abutted with the operation head of the limit switch;

the elastic reset piece is sleeved on the detection piece and limited by the detection piece and the mounting piece, and when the detection piece is stressed to move towards one end of the operation head, the elastic reset piece is compressed so as to apply reset elastic force opposite to the movement direction to the detection piece.

In a specific embodiment, the detecting member has a limiting table in an outer circumferential direction, and the elastic restoring member is limited between the limiting table and the mounting member.

In various embodiments, the resilient return member may comprise: the spring is sleeved on the detection piece; or alternatively

The grabbing type elastic resetting piece comprises an annular piece and at least three arc-shaped pieces, the annular piece is sleeved on the detecting piece, the at least three arc-shaped pieces are arranged around the annular piece, each arc-shaped piece faces to the outer side of the annular piece in an arc-shaped mode, and one end of each arc-shaped piece is fixedly connected with the annular piece; or alternatively

The elastic spindle resetting piece comprises two annular rings and at least three arc-shaped strips, wherein the two annular rings are sleeved on the detecting piece, and two ends of each arc-shaped strip are fixedly connected with one annular ring respectively.

Further in order to improve the dust-proof performance of the trigger assembly, the mount comprises: a cover body made of dustproof material. Further, the device can further comprise a cover body for sealing the cover body, wherein the cover body is made of dustproof materials and is fixedly connected with the cover body, and a through hole for the detection piece to penetrate out is formed in the cover body.

According to the trigger assembly of the limit switch, the elastic reset piece is added in the trigger assembly, so that a good auxiliary effect can be provided when the trigger assembly resets, the reset reliability of the trigger assembly is improved, and the reset reliability of the limit switch is also improved.

The utility model also provides a safety protection device of the tower crane applying any triggering component, which comprises a limit switch fixed at the bottom of the car of the tower crane, wherein the limit switch is used for controlling the operation of the tower crane, and the triggering component is used for triggering the limit switch.

In one embodiment, the safety device further comprises a lower profile plate fitted under the car, the mounting being secured to the lower profile plate.

According to the safety protection device provided by the utility model in the tower crane, as the elastic reset piece is added in the trigger assembly, the reset reliability of the trigger assembly is improved, so that the reset reliability of the limit switch is improved, and the reliability of the safety protection device is also improved.

Description of the drawings:

FIG. 1 is a schematic diagram of a tower elevator safety device according to one embodiment of the present utility model;

FIG. 2 is a schematic view of the spring in a compressed state when the lower limit protection function is triggered in the embodiment shown in FIG. 1;

FIG. 3 is a schematic diagram showing the working state of the embodiment shown in FIG. 1 when the lower profile protection function is triggered;

FIG. 4 is a schematic view of a limit trigger assembly according to the present utility model, wherein the mounting member is in a somewhat-shaped configuration;

fig. 5 is a schematic diagram of a hemispherical cover structure used as a mounting member in the limit trigger assembly provided by the utility model:

fig. 6 is a schematic diagram of a barrel-type cover structure used as a mounting member in the limit trigger assembly according to the present utility model:

fig. 7 is a schematic diagram of a spindle structure adopted by the elastic restoring member in the limit trigger assembly provided by the utility model.

Reference numerals:

1. a car floor; 2. swing rod; 3. a limit switch; 4. a lower profile plate; 5. a trigger plate; 6. a fixing frame; 7. a detection rod; 8. a spring; 9. a nut; 10. u-shaped structural member

50. Semi-spherical cover structure

60. Barrel type structure

70. An elastic hammer; 711,712, annular rings; 721,722,723, arc spring strips

The specific embodiment is as follows:

embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.

In embodiments of the utility model, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

In various safety protection devices, limit switches are widely used as a switching element in a scene where it is necessary to control the operation state of a motor. The limit switch converts mechanical signals into electric signals by utilizing collision of some moving parts of the production machinery. The structure of the limit switch for receiving the collision of the moving part is called an operation head, the operation head is linked with a movable contact in the limit switch, and the movable contact is connected to an electric appliance control loop and used for controlling the running state of the motor. The collision of the moving part triggers the limit switch to act, and the limit switch can be reset after the moving part is reset.

For example, in the lower limit protection device of a tower crane, the moving part is a detecting part which is movably assembled in the vertical direction, and when the detecting part reaches the ground or collides with an obstacle, the detecting part is stressed to jack up, so that the operating head is pushed to move to trigger the limit switch. When the tower crane resumes operation, the pressure of the automatic reset of the detecting element and the gravity of the detecting element are generally relied on, but the situation that the detecting element is blocked and can not be reset reliably still occurs. Particularly, when the tower crane is parked on the starting platform for a long time and dust or sundries are fully distributed on the periphery of the detection piece, the detection piece is easy to be blocked, and the reset of the detection piece is affected.

The inventor adds an elastic reset piece to the trigger component of the limit switch based on the utility model, the elastic reset piece is assembled on the detecting piece, the elastic reset piece is compressed and deformed when the detecting piece is stressed, the elastic reset piece applies an elastic force opposite to the moving direction to the detecting piece for restoring the deformation, and the reset of the detecting piece can be promoted, thereby improving the reliability of the reset of the detecting piece. The pressure applied to the limit switch can be relieved only when the detection piece resets, and the limit switch is reset. When the trigger assembly provided by the utility model is applied to the safety protection device of the tower crane, the reliability of the safety protection device can be effectively improved.

For a further understanding of the utility model, its objects, features and advantages, reference should be made to the following detailed description of embodiments taken in conjunction with the accompanying drawings.

As shown in fig. 1, for a specific embodiment of the triggering assembly provided in the present utility model applied to a safety protection device for a tower crane, since the working principle and circuit structure of an electrical control part triggered by a limit switch are well known to those skilled in the art, only the respective structural components located at the bottom of the car of the tower crane are schematically drawn in fig. 1, and mainly include: the elevator car comprises a car bottom plate 1, a swing rod 2, a limit switch 3, a lower contour plate 4 and a trigger component of the limit switch 3.

In the embodiment shown in fig. 1, the triggering component of the limit switch 3 is mounted on the lower contour plate 4, so that the limit switch 3 can also trigger the lower contour protection function. One end of the swing rod 2 is rotatably connected with the car bottom plate 1 through a screw rod, and the other end of the swing rod is used for installing a limit switch 3. The outer contour dimension of the lower contour plate 4 is approximately the same as that of the car bottom plate 1, a plurality of steel wires can be flexibly connected with the car bottom plate 1, and the lower contour plate 4 is used for detecting obstacles in the running channel of the tower crane. The limit switch 3 is used for realizing a lower limit protection function by being matched with the trigger component, and further realizing a lower profile protection function by being matched with the lower profile plate 4.

As shown in fig. 1, the trigger plate 5 and the detection lever 7 are fixedly connected in a T-shaped structure, and are assembled on the lower profile plate 4 by the fixing frame 6. The fixing frame 6 shown in fig. 1 has a shape like a Chinese character 'ji', and two bent edges of the Chinese character 'ji' shape can be fixed on the lower contour plate 4 by bolts, and a space in the fixing frame 6 forms an accommodating space. After passing through the accommodation space in the fixing frame 6, the detection rod 7 passes through the opening in the lower contour plate 4 and extends downward for a set detection length. The detecting rod 7 and the fixing frame 6 are movably assembled, the detecting rod 7 is limited by an opening above the fixing frame 6 and an opening on the lower contour plate 4 to move up and down along the vertical direction, and the trigger plate 5 is lapped on the top end of the fixing frame 6 and moves up and down along with the detecting rod 7. The trigger plate 5 is located below the limit switch 3 as a trigger piece, one side overlapping with the operation head of the limit switch 3 is a table structure, the table structure is a trigger surface of the operation head, and a limit boss can be arranged on the periphery of the table structure to prevent the operation head of the limit switch 3 from slipping from the table surface. Bullet

The spring 8 is sleeved on the detecting rod 7, one end of the detecting rod 7 close to the lower contour plate 4 is fixedly connected with a nut 9, and the nut 9 serves as a limiting table and plays a limiting role on the spring 8 together with the fixing frame 6.

As shown in fig. 2, when the tower crane descends, the detecting rod 7 as the detecting member is pushed up by resistance in the vertical direction when contacting the ground or an obstacle, the trigger plate 5 is then pushed up, the trigger surface of the trigger plate 5 forces the operation head of the limit switch 3 to move upward, the limit switch 3 acts, and the tower crane stops running. As can be seen from fig. 2, at this time, since the spring 8 is limited by the nut 9 and the fixing frame 6, that is, the spring 8 is clamped between the nut 9 and the inner wall of the fixing frame 6, when the detecting rod 7 is jacked up, the nut 9 compresses the spring 8 toward the top of the fixing frame 6, the spring 8 deforms, and the spring 8 applies an elastic force in the opposite direction to the detecting rod 7 through the nut 9 for restoring the deformation. When the tower lifter ascends or the obstacle is removed, the resistance of the detection rod 7 in the vertical direction is relieved, and the downward elastic force exerted by the spring 8 can well promote the detection rod 7 to move downwards and return to the reset state shown in fig. 1. The trigger plate 5 is driven to move downwards in the resetting process of the detection rod 7, the resistance to the operating head of the limit switch 3 is relieved, the operating head is restored to the normal position, the limit switch 3 is reset along with the normal position, and the lower limit protection function of the safety protection device is restored.

As shown in fig. 3, the embodiment also has a lower profile triggering function, when the lower profile plate 4 contacts an obstacle, for example, when an operator is in the operation channel of the tower crane, the lower profile plate 4 is jacked up by the operator, and the trigger plate 5 triggers the limit switch 3, so that the tower crane stops operating. That is, with one limit switch 3, a lower profile trigger mechanism and a lower limit trigger mechanism are simultaneously realized.

The probe rod 7 shown in fig. 1 and 2 is merely an example of a rod-type probe structure, and other sheet-like or polygonal rigid structures may be used as the probe instead of the probe rod 7, and the present utility model is not limited to the rod-like structure. The holder 6 shown in fig. 1 and 2 is also merely an example of a mounting member of a somewhat letter-shaped structure, and the trigger plate 5 shown in fig. 1 to 4 is likewise merely an example of a trigger member of a plate-shaped structure.

As shown in fig. 4, the trigger assembly of the mounting bracket 6 is a schematic structure of a mounting member with a shape of a Chinese character 'ji', and the trigger assembly may be made into a separate assembly mainly comprising: trigger plate 5, mount 6, probe rod 7, spring 8 and nut 9 for spacing. It should be noted that, in this embodiment, the trigger assembly of the limit switch 3 is not necessarily assembled to the lower profile plate 4. If the lower contour protection function is not required to be realized at the same time, the triggering component of the limit switch 3 can be assembled on a structure fixedly connected with the bottom of the car, and the structure only needs to move up and down along with the car. As also shown in fig. 4, when the trigger assembly is made as a separate assembly, a U-shaped structure 10 may be mounted under the probe 7 to locate the end of the probe 7.

The mounting member of the trigger assembly may also be in a hood structure, such as a hemispherical hood, a tetrahedral hood, or a hollow barrel structure. As shown in fig. 5, a schematic structural diagram of a trigger assembly using a hemispherical cap structure 50 is shown in fig. 6, and a schematic structural diagram of a trigger assembly using a barrel structure 60 is shown.

Considering that the natural environment where the wind power generation system is located is usually more sandy and more dust, but the operation channel of the tower crane is not a closed environment, the use frequency of the tower crane is not very high, and if the wind power generation system is parked for a long time, the assembly gaps among the detection piece, the mounting piece and the elastic reset piece are also extremely easy to be polluted by dust and sundries, so that the operation of the detection piece and the elastic reset piece is influenced. In the utility model, the cover-type mounting piece can be made of dustproof materials, and a cover body can be added, and a through hole for the detection piece to pass through can be arranged on the cover body, and can play a role in positioning the end part of the detection piece, so that the detection piece can move up and down along the vertical direction. Therefore, no matter whether the lower contour plate or other fixed plates below the mounting piece are dustproof, the triggering component of the whole limit switch has good dustproof and impurity interference preventing functions, no maintenance or cleaning is needed, the service life is very long on the basis of ensuring the operation reliability of the triggering component of the limit switch, and almost no maintenance cost is caused.

The spring 8 shown in fig. 1 and 2 is merely an example of a conventional elastic restoring member and is not the only structure of an elastic restoring member that can be used in the present utility model. In the embodiment provided by the utility model, the elastic resetting piece can meet the following conditions according to different detection piece structures: the device can be assembled on the detecting piece and limited by the detecting piece and the mounting piece, and is compressed to generate deformation when the detecting piece moves under the force, so that reset elastic force opposite to the moving direction is applied to the detecting piece.

The elastic resetting piece can be a grabbing type elastic resetting piece with a three-grabbing structure, and comprises an annular piece sleeved on the detecting piece, 3 or more than 3 arc-shaped elastic pieces uniformly arranged around the annular piece, and each arc-shaped elastic piece is abutted against the inner wall of the mounting piece. The arc-shaped elastic sheet can evenly surround the annular sheet, reverse elastic force is evenly applied to the periphery of the detection piece when the elastic reset piece is compressed and deformed, the detection piece is kept to move in the vertical direction, and the detection piece is prevented from being clamped on the mounting piece due to the inclination angle.

The elastic restoring member may be, for example, a spindle elastic restoring member, such as an elastic hammer 70 shown in fig. 7, where two ends of the elastic hammer 70 are respectively provided with annular rings 711,712 sleeved on the detecting member, and 3 arc elastic strips 721,722,723 uniformly surrounding the two annular rings 711, 712. The number of the arc-shaped elastic strips can be 4 or more, the preferable layout is uniformly arranged around the annular ring, reverse elastic force can be uniformly applied to the periphery of the detection piece during compression deformation, and the detection piece is kept to move in the vertical direction so as to prevent the detection piece from being clamped with the mounting piece. The elastic hammer 70 shown in fig. 7, if an annular ring is removed, is a three-grip grab type elastic return member.

The elastic resetting piece such as the spring 8 or the elastic hammer 70 can be made of rigid materials, and the rigid materials can generate larger rebound force after compression deformation, are not easy to age and avoid maintenance cost. When the elastic hammer 70 is installed in the triggering assembly shown in fig. 4, two annular rings 711 and 712 of the elastic hammer 70 can be sleeved on the detecting rod 7, one annular ring 711 is limited by a nut 9 on the detecting rod 7, the other annular ring 712 is limited by the fixing frame 6, when the detecting rod 7 is forced to move upwards, the arc-shaped elastic strips 721,722 and 723 are compressed and deformed, and reverse elastic force is applied to the nut 9 of the detecting rod 7 through the annular rings 711, so that the detecting rod 7 is driven to reset.

It should be noted that, the nut 9 shown in fig. 1 is only one structure of the limiting table, and the limiting table may be a boss structure integrally formed with the probe body.

In summary, the trigger assembly of the limit switch provided by the utility model can improve the reset reliability of the limit switch. When the safety protection device is applied to various protection devices needing to trigger the limit switch, the reliability of the safety protection device can be effectively improved. The trigger component of the limit switch provided by the utility model can be an independent component, is convenient to produce, install and replace and can be reused. Particularly, when the Yu Datong elevator is used, the triggering component can adopt a cover body made of dustproof materials, and the cover body is further covered by the cover body made of dustproof materials, so that the safety protection device has a good dustproof and sundry-proof effect, and the reliability of the safety protection device of the tower elevator is further improved. And the maintenance is not needed frequently, so that the maintenance cost is effectively reduced, the service life is prolonged, and the method is particularly suitable for field operation environments.

Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the utility model, and not limiting. While the utility model has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, or equivalent substitutions can be made to the technical solutions of the present utility model without departing from the spirit and scope of the technical solutions of the present utility model, and it is intended to be covered by the scope of the claims of the present utility model.

Claims (10)

1. A limit switch's trigger subassembly for a tower section of thick bamboo lift's safety device, safety device includes limit switch, its characterized in that, trigger subassembly includes: mounting, detecting element, trigger piece and elasticity restoring element, wherein:

the detection piece is movably arranged in the mounting piece in a penetrating way, one end of the detection piece is fixedly connected with the trigger piece, and the other end of the detection piece extends out of the mounting piece by a set length;

the trigger piece is lapped on the mounting piece and is abutted with the operation head of the limit switch;

the elastic reset piece is sleeved on the detection piece and limited by the detection piece and the mounting piece, and when the detection piece is stressed to move towards one end of the operation head, the elastic reset piece is compressed so as to apply reset elastic force opposite to the movement direction to the detection piece.

2. The trigger assembly of claim 1, wherein the probe is provided with a stop in a peripheral direction, and the resilient return member is positioned between the stop and the mounting member.

3. The trigger assembly of claim 2, wherein the resilient return member comprises a spring that is nested on the probe member.

4. The trigger assembly of claim 2, wherein the resilient return member comprises a grip-type resilient return member, the grip-type resilient return member comprises an annular sheet and at least three arcuate sheets, the annular sheet is sleeved on the detecting member, the at least three arcuate sheets are disposed around the annular sheet, each arcuate sheet is arcuate toward the outside of the annular sheet, and one end of each arcuate sheet is fixedly connected to the annular sheet.

5. The trigger assembly of claim 2, wherein the elastic restoring member comprises a spindle elastic restoring member, the spindle elastic restoring member comprises two annular rings and at least three arc-shaped strips, the two annular rings are sleeved on the detecting member, two ends of each arc-shaped strip are respectively and fixedly connected with one annular ring, and each arc-shaped piece faces to the outer side of the annular ring.

6. The trigger assembly of claim 2, wherein the limit switch is mounted to a bottom of a car of the tower elevator and the mounting is mounted below the bottom of the car.

7. The trigger assembly of any one of claims 1 to 6, wherein the mount comprises: a cover body made of dustproof material.

8. The trigger assembly of claim 7, further comprising a cover for sealing the housing, the cover being made of a dust-proof material and fixedly connected to the housing, the cover being provided with a through hole through which the probe passes.

9. The utility model provides a safety arrangement of tower section of thick bamboo lift, is including fixing the limit switch of tower section of thick bamboo lift's car bottom, limit switch is used for control the operation of tower section of thick bamboo lift, its characterized in that still includes: a trigger assembly according to any one of claims 1 to 8.

10. The safety device of claim 9, further comprising a lower profile plate mounted below the car, the mounting member being secured to the lower profile plate.