A heavy hammer type height limiting switch lock device and crane

Abstract

This utility model discloses a weighted height limit switch locking device and a crane, aiming to solve the problem of damage caused by impact overload of height limit switches in the prior art. The height limit switch includes an internal limit switch and a contact for triggering the internal limit switch. It is characterized by further including a limit seat, a traction member, and a limit member disposed on the traction member. When the weight is in the lifted state, the elastic reset member drives the contact to trigger the internal limit switch through its own elastic force, and the traction member drives the limit member to abut against the limit step. This utility model is applicable to crane hook lifting, ensuring that even if the weight swings violently during travel, the height limit switch will not impact the internal limit switch, thus preventing damage caused by impact overload of the limit switch.

Description

Technical Field

[0001] This utility model relates to the field of lifting and transport machinery technology, and in particular to a weighted height limit switch locking device and a crane. Background Technology

[0002] The counterweight-type lifting height limit switch is a component used to safely limit the lifting height of a crane hook. The height limit switch is installed in the boom triggering section and contains a limit switch, a pull rope with a spring and a contact point. Its working principle is as follows: the pull rope of the height limit switch is connected to a counterweight via a wire rope or chain. When the crane is operating normally, the counterweight is suspended, and the pull rope of the height limit switch is pulled down by the counterweight. At this time, the internal limit switch is not triggered. When the crane hook reaches the safe warning height, the counterweight is lifted by the hook. At this time, the pull rope of the height limit switch, deprived of the counterweight's weight, springs upward, triggering the internal limit switch. In other words, the suspended or lifted state of the counterweight determines whether the pull rope of the height limit switch is pulled down or springs back. Different movement states of the pull rope correspond to whether the internal limit switch can be triggered, thus corresponding to different height limit switch signal outputs. The controller uses different signal outputs to achieve safe control of the crane.

[0003] The current problem is that during the crane's operation, the counterweight and wire rope or chain swing back and forth, which can cause continuous impact on the internal limit switches, leading to their damage. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a heavy hammer type height limit switch locking device and crane, so as to solve the defect of damage to the height limit switch caused by impact overload in the prior art.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] On the one hand, this utility model provides a weighted height limit switch locking device, including a height limit switch, the height limit switch including an internal limit switch and a contact for triggering the internal limit switch, and also including a limit seat, a traction member and a limit member disposed on the traction member; the limit seat is connected to the height limit switch, and the traction member is drivenly connected to the contact.

[0007] The limiting seat is provided with a limiting channel and a limiting step, the limiting channel and the limiting step forming a limiting part adapted to the limiting member; the height limiting switch is also provided with an elastic reset member;

[0008] When the hammer is in a suspended state, the elastic reset member is compressed, and the traction member, under the action of the weight of the hammer, drives the limiting member to move along the limiting channel and disengage from the limiting step, while simultaneously driving the bumper away from the internal limit switch.

[0009] When the hammer is in the lifted state, the elastic reset member drives the bumper to trigger the internal limit switch through its own elastic force, and drives the limit member to abut against the limit step through the traction member.

[0010] The height limit switch is connected to a limit seat, which has a limit channel and a limit step. The limit channel and the limit step form a limit part that matches the limit component. The limit component is connected to the traction component. The limit channel can achieve lateral limit of the limit component, preventing the bumper from accidentally triggering the internal limit switch due to the swing of the traction component following the weight. The limit step can achieve longitudinal limit of the limit component, preventing the bumper from hitting the internal limit switch under the drive of the spring reset component, which would damage the internal limit switch. At the same time, the preload of the elastic reset component can lock the limit component into the limit seat, so that the limit seat and the height limit switch remain relatively fixed under the push of the limit component. Thus, without the need for an additional connecting structure, the installation process of the limit seat and the height limit switch is quick and convenient, simplifying the assembly process of the limit seat and the height limit switch, reducing the assembly difficulty before use and the maintenance cost later.

[0011] Furthermore, the contact head includes a trigger part for touching the internal limit switch and a guide part connected to the trigger part. The height limit switch has a guide channel inside, and the guide part is inserted into the guide channel to force the contact head to move in a predetermined direction according to the guide channel.

[0012] Under the traction of the weight, the bumper moves within the guide channel of the height limit switch, squeezing the elastic reset element to move the trigger part away from the limit switch, thus preventing the bumper from accidentally touching or hitting the limit switch when the weight is suspended.

[0013] Furthermore, the elastic reset member is supported between the guide channel and the trigger portion.

[0014] One end of the elastic reset member abuts against the trigger part of the bumper, and the other end abuts against the guide channel of the height limit switch, providing the bumper with both radial and axial preload between the bumper and the height limit switch.

[0015] Furthermore, the bumper is T-shaped, wherein the outer diameter of the trigger portion is larger than the outer diameter of the guide portion.

[0016] The outer diameter of the trigger part of the bumper is larger than the outer diameter of the guide part. When moving in the guide channel, the trigger part restricts radial disengagement and partial rotation, while the guide part restricts axial movement to prevent the bumper from disengaging from the guide channel.

[0017] Furthermore, the elastic reset member includes an annular compression spring, which is sleeved on the outer periphery of the guide portion.

[0018] The axial pressure is converted into linear driving force by the elastic deformation of the compression spring. The trigger part of the bumper abuts against the two ends of the spring at the bottom of the guide channel, effectively eliminating the impact vibration caused by mechanical clearance, realizing smooth control of the bumper moving towards the limit seat, significantly reducing the risk of off-center load, and providing the bumper with axial reset elastic force in the unlocked state of the limit component.

[0019] Furthermore, the limiting seat is detachably connected to the height limiting switch, and the limiting seat is provided with an opening communicating with the limiting part. The traction member can drive the limiting member to enter and exit the limiting part through the opening.

[0020] First, push the opening of the limit seat into the edge of the height limit switch housing. Then, lift the traction part, which is naturally hanging away from the height limit switch, towards the side of the height limit switch. When the top surface of the opening and the bottom outer surface of the housing are completely in contact, pull the traction part through the limit channel and pull it down. This will cause the elastic reset part to generate a pre-tightening force under the pressure of the bumper. The limit part will then be engaged and pressed against the limit part. At this point, release the traction part and let it hang down naturally to complete the installation of the limit seat and the height limit switch, and achieve locking.

[0021] Furthermore, the traction component is connected to the counterweight via a pull rope.

[0022] The weight is suspended by being fixed to the traction component by a rope.

[0023] Furthermore, the limiting seat is provided with a hanging rope, and the height limiting switch is provided with a hanging hole, and the hanging rope is hung in the hanging hole.

[0024] By setting a hanging rope on the limit seat and cooperating with the hanging hole on the height limit switch, users can use the lock device safely and flexibly in any situation, avoiding the phenomenon that the limit seat and height limit switch are easily lost when unlocking, and especially solving the pain point of easy falling in high-frequency movement scenarios.

[0025] Furthermore, this utility model also provides a crane, which is equipped with the counterweight-type height limit switch locking device described in the first aspect.

[0026] Compared with the prior art, the beneficial effects of the weighted height limit switch locking device of this utility model are as follows: the traction component connected to the weight passes through the opening of the limit seat, and the axial and radial multiple constraints of the limit component and the limit part restrict the bumper. At the same time, the limit seat and the height limit switch can be installed simply and quickly. When the crane is moving at a safe lifting height or vibrating at high frequency, even if the weight drives the traction component to swing back and forth, the limit component will always be within the limit part, avoiding radial displacement of the limit component, which would cause the bumper to shake and the limit switch to be impacted, resulting in accidental contact or damage. Therefore, this utility model has strong adaptability, which not only prevents the bumper from being misoperated, but also extends the service life of the overall structure and improves safety and reliability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the locked state of a counterweight-type height limit switch locking device provided in one embodiment of this utility model;

[0028] Figure 2 This is a schematic diagram of the unlocking state of a counterweight-type height limit switch lock device provided in one embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the height limit switch when it is not triggered according to one embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the height limit switch when it is triggered according to an embodiment of the present invention;

[0031] Figure 5 yes Figure 1 Schematic diagram of the middle limit seat;

[0032] Figure 6 yes Figure 5 A schematic diagram of the limiting seat from another perspective;

[0033] Figure 7 yes Figure 5 The diagram shows another view of the limiting seat structure.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Limit seat; 2. Height limit switch; 3. Internal limit switch; 4. Pull rope; 41. Traction component; 42. Contact head; 43. Elastic reset component; 44. Limit component; 5. Hanging hole; 11. Guide channel; 12. Limiting step; 13. Hanging rope; 14. Opening; 15. Limiting channel. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0037] like Figure 1 As shown, this embodiment provides a weighted height limit switch locking device, including a height limit switch 2, a limit seat 1, a traction member 41, and a limit member 44 disposed on the traction member 41.

[0038] See Figure 3 The height limit switch 2 includes an internal limit switch 3 and a contact head 42. The contact head 42 is correspondingly configured with the internal limit switch 3 and is used to trigger the internal limit switch 3 when the weight is lifted to a preset height and then lifted. The height limit switch 2 is also equipped with an elastic reset element, which is used to drive the contact head 42 to reset when the weight is lifted.

[0039] See also Figure 1 The limiting seat 1 is connected to the height limit switch 2. One end of the traction member 41 passes through the limiting seat 1 and is connected to the contact head 42 inside the height limit switch 2. The other end of the traction member 41 can be directly or indirectly connected to the weight to realize the suspension and transfer of the weight. The traction member 41 is usually a flexible component; in some embodiments, the traction member 41 can be made of steel wire rope.

[0040] like Figure 4 As shown, the limiting seat 1 has a limiting channel and a limiting step, the limiting channel and the limiting step forming a limiting part, which is adapted to the limiting member 44. More specifically, based on the attached... Figure 4 The indicated orientation or positional relationship shows that the limiting channel is used to achieve lateral limiting of the limiting member 44, preventing the traction member 41 from swinging with the weight, thereby causing the bumper 42 to mistakenly trigger the internal limit switch 3. The limiting step is used to achieve longitudinal limiting of the limiting member 44, preventing the bumper 42 from hitting the internal limit switch 3 under the drive of the elastic reset member 43, thus preventing damage to the internal limit switch 3. It should be noted that the length of the limiting channel should ensure that when the bumper 42 is pulled downward to the limit position, the limiting member 44 will not disengage from the limiting channel, thereby preventing the traction member 41 from swinging left and right with the weight after the limiting member 44 disengages from the limiting channel, thus mistakenly triggering the internal limit switch 3.

[0041] When the weight-type height limit switch 2 locking device is put into use, if the weight is in a suspended state, the elastic reset member 43 is compressed, and the traction member 41, under the gravity of the weight, drives the limit member 44 to move along the limit channel 15 and disengage from the limit step 12, while simultaneously driving the contact head 42 away from the internal limit switch 3; if the weight is lifted to a preset height and is in a supported state, the elastic reset member 43 drives the contact head 42 to trigger the internal limit switch 3 through its own elastic force, and drives the limit member 44 to abut against the limit step 12 through the traction member 41.

[0042] In summary, the weighted height limit switch 2 locking device provided in this embodiment has a limit seat 1 connected to the height limit switch 2. The limit seat 1 has a limit channel 15 and a limit step 12. The limit channel 15 and the limit step 12 form a limit part that is adapted to the limit member 44. The limit member 44 is connected to the traction member 41. The limit channel 15 can realize the lateral limit of the limit member 44, avoiding the accidental triggering of the internal limit switch 3 by the head 42 due to the swing of the traction member 41 following the weight. The limit step 12 can realize the longitudinal limit of the limit member 44. This prevents the head 42 from striking the internal limit switch 3 under the drive of the spring reset component, which could damage the internal limit switch 3. At the same time, the pre-tightening force of the elastic reset component 43 can lock the limiting component 44 into the limiting seat 1, so that the limiting seat 1 and the height limit switch 2 remain relatively fixed under the push of the limiting component 44. Thus, without the need for additional connecting structures, the installation process of the limiting seat 1 and the height limit switch 2 can be realized quickly and conveniently, simplifying the assembly process of the limiting seat 1 and the height limit switch 2, and reducing the assembly difficulty before use and the maintenance cost later.

[0043] In some embodiments, the contact head 42 includes a trigger portion for actuating the internal limit switch 3 and a guide portion connected to the trigger portion. The height limit switch 2 has a guide channel 11 inside, and the guide portion is inserted into the guide channel 11 to force the contact head 42 to move in a predetermined direction along the guide channel 11. Optionally, the contact head 42 can be T-shaped, with the trigger portion configured such that its outer diameter is larger than the outer diameter of the guide portion. It is understood that the radial dimension of the guide portion of the contact head 42 should be adapted to the guide channel to achieve more accurate guidance. The outer diameter of the trigger portion of the contact head 42 is larger than the diameter of the guide channel 11 to avoid passing through the guide channel 11, thereby preventing the contact head 42 from dislodging from the height limit switch 2. However, this is not a limitation; the contact head 42 can also be configured in other possible shapes, such as an inverted L-shaped structure.

[0044] In some embodiments, the elastic reset member 43 is supported between the guide channel 11 and the trigger portion. Optionally, the elastic reset member can be a ring compression spring, which is sleeved on the outer periphery of the guide portion. It is understood that the elastic reset member 43 is externally connected to the guide portion of the contact 42, with its two ends respectively abutting against the trigger portion of the contact 42 and the bottom end of the guide channel, providing multiple axial and radial constraints for the contact 42 within the guide channel.

[0045] In some embodiments, the limiting seat 1 is detachably connected to the height limiting switch 2. The limiting seat 1 has an opening 14 communicating with the limiting part, and the traction member 41 can drive the limiting member 44 to enter and exit the limiting part through the opening 14. More specifically, based on the attached... Figure 2 As shown in the orientation or positional relationship, opening 14 faces to the right. When the limiting seat 1 needs to be put into use, the traction member 41 can be lifted from opening 14 to the upper right position. At this time, the spring return member 43 is in a relatively relaxed state, and the limiting member 44 disengages from the limiting part, making it easier for the limiting seat 1 and the height limit switch 2 to be assembled and engaged. After assembly, the traction member 41 is pulled to the lower left, causing it to drive the limiting member 44 to engage with the limiting part of the limiting seat 1 from opening 14. Since the outer shape of the limiting member 44 matches the inner wall contour of the limiting part, the limiting member 44 can precisely engage with the limiting part after entering the limiting part, realizing the locking of the limiting seat 1 and the height limit switch 2, and preventing the limiting member 44 from being displaced due to vibration, external force collision, or other factors.

[0046] It is understandable that the height limit switch 2, as a component with a height limit function, can be used together with the limit seat 1 depending on the on-site construction conditions. When the limit seat 1 is removed from the height limit switch 2, the height limit switch 2 can be used alone for height limit. When it is necessary to remove the limit seat 1, the traction member 41 is pulled out from the opening 14, causing the limit member 44 to come out from the side of the limit part, gradually freeing it from the constraint of the limit part. In addition, to improve the reliability of the movement process, a wear-resistant coating (such as a polytetrafluoroethylene coating or a chrome plating layer) can be provided at the connection between the traction member 41 and the limit member 44 to reduce component wear caused by long-term movement; at the same time, a chamfered or rounded corner structure is provided at the edge of the opening 14 to reduce the frictional resistance when the limit member 44 enters and exits, further optimizing the cooperation effect between the two and ensuring that the entire movement process is efficient, stable and has a long service life.

[0047] In some embodiments, the traction member 41 is connected to the counterweight via the pull rope 4. The counterweight is connected to the pull rope 4 to achieve suspension and transfer. The load capacity of the traction member 41 and the pull rope 4 can be selected according to the weight of the counterweight.

[0048] In some embodiments, the limiting seat 1 is provided with a hanging rope 13, and the height limit switch 2 is provided with a hanging hole 5. The hanging rope 13 is hung in the hanging hole 5. Adding a hanging rope 13 to the limiting seat 1 can prevent the limiting seat 1 from losing its restraint and falling and being lost when the limiting seat 1 and the height limit switch 2 are in a disassembled state. Users can use this locking device safely and flexibly according to the needs of the construction scenario. This design not only avoids the problem of the limiting seat 1 and the height limit switch 2 being easily lost when unlocked, but also solves the problem of the limiting seat 1 being easy to fall off in high-frequency movement scenarios.

[0049] In some embodiments, this embodiment also provides a crane configured with the counterweight-type height limit switch locking device described in any of the foregoing embodiments.

[0050] Working principle:

[0051] During assembly, align the top of the limit seat 1 with the bottom edge of the height limit switch 2, see [reference]. Figure 2 Pull the traction component 41 to the upper right to ensure that the limit seat 1 and the height limit switch 2 are tightly fitted. Then, the traction component 41 passes through the limit channel 15 from the opening 14 of the limit seat 1. Continue to pull the traction component 41 to drive the bumper 42 to move away from the internal limit switch 3 in the guide channel 11. Continuously squeeze the elastic reset component 43 until the limit component 44 is at the bottom of the limit channel 15 of the limit seat 1. Then, release the traction component 41, and the limit component 44 will be inserted into the limit channel 15 and press against the limit step 12. At this time, the limit seat 1 and the height limit switch 2 are assembled. Under the constraint of the limit component 44, the bumper 42 has a tendency to move away from the contact of the internal limit switch 3. This avoids the phenomenon that the limit component 44 will continuously collide with the internal limit switch 3 due to axial displacement during the movement or high-frequency vibration of the device before the crane hook reaches the upper limit height, which may cause malfunction or impact overload and make the crane work malfunction. After assembly, the hanging rope 13 on the limit seat 1 is connected to the hanging hole 5 of the height limit switch 2 for suspension. When the crane hook reaches the upper limit of the lifting height, the counterweight is lifted, the traction component 41 is in a relaxed state, the limit component 44 and the stop 42 lose gravity constraint, and the stop 42 triggers the internal limit switch 3 under the reset action of the compression spring. At this time, the limit seat 1 and the height limit switch 2 are in an unlocked state. Under the action of the hanging rope 13, the phenomenon of falling and being lost when the limit seat 1 and the height limit switch 2 are separated is effectively avoided, which improves the applicability of the locking device to different usage scenarios and enhances the convenience of the device.

[0052] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this utility model and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A weighted height limit switch locking device, comprising a height limit switch (2), wherein the height limit switch (2) includes an internal limit switch (3) and a contact (42) for triggering the internal limit switch (3), characterized in that, It also includes a limiting seat (1), a traction member (41), and a limiting member (44) provided on the traction member (41); the limiting seat (1) is connected to the height limiting switch (2), and the traction member (41) is connected to the bumper (42) in a transmission connection; The limiting seat (1) is provided with a limiting channel (15) and a limiting step (12). The limiting channel (15) and the limiting step (12) form a limiting part that is adapted to the limiting member (44). The height limiting switch (2) is also provided with an elastic reset member (43). When the hammer is in a suspended state, the elastic reset member (43) is compressed, and the traction member (41) drives the limiting member (44) to move along the limiting channel (15) and disengage from the limiting step (12) under the gravity of the hammer, while driving the bump (42) away from the internal limit switch (3). When the hammer is in the lifted state, the elastic reset member (43) drives the bumper (42) to trigger the internal limit switch (3) through its own elastic force, and drives the limit member (44) to abut against the limit step (12) through the traction member (41).

2. The counterweight-type height limit switch locking device according to claim 1, characterized in that, The contact head (42) includes a trigger part for touching the internal limit switch (3) and a guide part connected to the trigger part. The height limit switch (2) has a guide channel (11) inside. The guide part is inserted into the guide channel (11) to force the contact head (42) to move in a predetermined direction according to the guide channel (11).

3. The counterweight-type height limit switch locking device according to claim 2, characterized in that, The elastic reset member (43) is supported between the guide channel (11) and the trigger part.

4. The counterweight-type height limit switch locking device according to claim 2 or 3, characterized in that, The bumper (42) is T-shaped, wherein the outer diameter of the trigger portion is larger than the outer diameter of the guide portion.

5. The counterweight-type height limit switch locking device according to claim 2 or 3, characterized in that, The elastic reset member (43) includes an annular compression spring, which is sleeved on the outer periphery of the guide portion.

6. The counterweight-type height limit switch locking device according to claim 1, characterized in that, The limiting seat (1) is detachably connected to the height limiting switch (2). The limiting seat (1) is provided with an opening (14) communicating with the limiting part. The traction member (41) can drive the limiting member (44) to enter and leave the limiting part through the opening (14).

7. The counterweight-type height limit switch locking device according to claim 1, characterized in that, The traction component (41) is connected to the counterweight via a pull rope (4).

8. The counterweight-type height limit switch locking device according to claim 1, characterized in that, The limiting seat (1) is provided with a hanging rope (13), and the height limiting switch (2) is provided with a hanging hole (5). The hanging rope (13) is hung in the hanging hole (5).

9. A crane, characterized in that, The crane is equipped with a weighted height limit switch locking device as described in any one of claims 1 to 8.

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