Electric single-beam crane with safety protection structure

Abstract

The utility model relates to the technical field of hoist, concretely relates to an electric single-beam hoist with safety protection structure, including hoist girder, hoist girder is assembled with electric hoist, and the both ends fixed connection of hoist girder are provided with fixed plate, and fixed plate is equipped with safety protection mechanism, and safety protection mechanism includes mounting block, and the inside of mounting block is equipped with cavity, and the between mounting block and electric hoist is equipped with buffer plate, and the between mounting block and buffer plate is equipped with guide rod, and the between mounting block and buffer plate is fixedly connected with first spring, and the recess is set up in guide rod one end, and the fixed connection with rack is set up in recess, and the rotation is connected with the axle in cavity, and the coaxial fixed tooth wheel is installed on the axle, and the one end of axle is installed with ratchet and pawl mechanism, the utility model discloses through ratchet and pawl mechanism makes the gear and the rack meshing form self -locking, and the resilience of first spring is mechanically locked, thereby can reduce the resilience condition of first spring, reduces the noise of resilience, reduces the risk of equipment damage.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to an electric single-girder crane with a safety protection structure. Background Technology

[0002] As a core piece of equipment in industrial material handling, the operational safety of electric single-girder cranes is directly related to production safety. Currently, spring buffer devices are commonly used as the safety protection structure for cranes. These devices are installed at both ends of the crane's main beam and buffer the impact force when the electric hoist goes out of control through spring deformation.

[0003] However, when the electric hoist impacts the spring buffer device, the spring compression stroke is positively correlated with the reverse thrust. At the maximum compression state, the elastic potential energy stored in the spring reaches its peak. At the instant the impact force is eliminated, the spring rebounds rapidly, generating a strong reverse thrust, which causes the electric hoist to violently rebound and vibrate. This phenomenon not only generates noise but may also cause structural damage to the equipment. Therefore, there are still shortcomings and deficiencies in the existing technology. Utility Model Content

[0004] This utility model provides an electric single-girder crane with a safety protection structure to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an electric single-girder crane with a safety protection structure, including a crane main beam, an electric hoist mounted on the crane main beam, and fixed plates fixedly connected to the bottom surfaces of both ends of the crane main beam. A safety protection mechanism is provided on the side of the fixed plate near the electric hoist. The safety protection mechanism includes a mounting block fixed inside the fixed plate, a cavity opened inside the mounting block, a buffer plate provided between the mounting block and the electric hoist, a horizontally arranged guide rod provided between the mounting block and the buffer plate, a first spring sleeved on the guide rod fixedly connected between the mounting block and the buffer plate, one end of the guide rod fixedly connected to the buffer plate, the other end of the guide rod extending into the cavity and slidingly connected to the mounting block, a groove opened axially on the side wall of the guide rod at one end inside the cavity, a rack fixedly connected in the groove, a rotating shaft rotatably connected in the cavity, a gear coaxially fixed on the rotating shaft and meshing with the rack, and one end of the rotating shaft extending outside the mounting block and equipped with a ratchet and pawl mechanism.

[0006] Preferably, the ratchet and pawl mechanism includes a ratchet coaxially fixed on a rotating shaft, a pawl hinged to a mounting block to engage with the ratchet, and a spring piece provided between the outer side of the pawl near the ratchet and the mounting block.

[0007] Preferably, an electric telescopic rod is installed on the mounting block. The electric telescopic rod is located on the inner side of the end of the pawl away from the ratchet, and a connecting rope is fixedly connected between the telescopic end of the electric telescopic rod and the inner side of the end of the pawl away from the ratchet.

[0008] Preferably, a buffer pad is fixedly connected to the inner wall of the cavity, and the position of the buffer pad corresponds to the end of the guide rod away from the buffer plate.

[0009] Preferably, the electric hoist is fixedly connected to both ends with impact heads, and the inner side of the buffer plate is provided with guide grooves that are compatible with the impact heads.

[0010] Preferably, two sets of symmetrically arranged buffer mechanisms are installed between the buffer plate and the mounting block. The buffer mechanism includes a groove opened on the side of the mounting block near the buffer plate. The groove is arranged along the length direction of the mounting block. A limiting rod parallel to the groove is fixedly connected in the groove. A slider is slidably connected on the limiting rod. A second spring is fixedly connected between the slider and one end of the groove. The second spring is sleeved on the limiting rod. An inclined support rod is hinged between the slider and the buffer plate.

[0011] The beneficial effects of this utility model are as follows: (1) This utility model prevents the shaft from reversing through the ratchet and pawl mechanism, so that the gear and rack mesh to form a self-locking mechanism, preventing the guide rod from retracting, and thus the first spring rebound force is mechanically locked, thereby reducing the situation where the electric hoist rebounds due to the rebound of the first spring, reducing the rebound noise, and reducing the risk of equipment damage; (2) When the electric hoist returns to the safe area, the telescopic rod pulls the end of the pawl away from the ratchet through the connecting rope, so that the pawl rotates around the hinge point and disengages from the ratchet, thereby releasing the lock on the shaft so that the first spring can be reset; (3) By setting the impact head and guide groove, it is ensured that the impact force of the electric hoist is transmitted axially to the safety protection mechanism, thereby reducing the situation where the safety protection mechanism fails due to uneven force. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;

[0014] Figure 3 This is a schematic diagram of the internal structure of the mounting block of this utility model.

[0015] Reference numerals: 1. Crane main beam; 2. Electric hoist; 3. Fixed plate; 4. Safety protection mechanism; 41. Mounting block; 42. Cavity; 43. Buffer plate; 44. Guide rod; 45. First spring; 46. Groove; 47. Rack; 48. Rotating shaft; 49. Gear; 410. Buffer pad; 411. Impact head; 412. Guide groove; 5. Ratchet and pawl mechanism; 51. Ratchet; 52. Pawl; 53. Spring; 54. Electric telescopic rod; 55. Connecting rope; 6. Buffer mechanism; 61. Slide groove; 62. Limiting rod; 63. Sliding block; 64. Second spring; 65. Support rod. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings.

[0017] like Figure 1-3 As shown, this utility model provides an electric single-girder crane with a safety protection structure, including a crane main beam 1, an electric hoist 2 mounted on the crane main beam 1, and fixed plates 3 fixedly connected to the bottom surfaces of both ends of the crane main beam 1. A safety protection mechanism 4 is provided on the side of the fixed plate 3 near the electric hoist 2. The safety protection mechanism 4 includes a mounting block 41 fixed inside the fixed plate 3, a cavity 42 inside the mounting block 41, a buffer plate 43 between the mounting block 41 and the electric hoist 2, and a horizontally arranged guide rod 44 between the mounting block 41 and the buffer plate 43. A first spring 45 is fixedly connected between the buffer plate 43 and the guide rod 44. One end of the guide rod 44 is fixedly connected to the buffer plate 43, and the other end of the guide rod 44 extends into the cavity 42 and is slidably connected to the mounting block 41. A groove 46 is provided axially on the side wall of one end of the guide rod 44 in the cavity 42. A rack 47 is fixedly connected in the groove 46. A rotating shaft 48 is rotatably connected in the cavity 42. A gear 49 that meshes with the rack 47 is fixedly fixed on the rotating shaft 48. One end of the rotating shaft 48 extends out of the mounting block 41 and is equipped with a ratchet and pawl mechanism 5 to prevent the rotating shaft 48 from reversing.

[0018] Specifically, when the electric hoist 2 crashes into the buffer plate 43 out of control, the buffer plate 43 compresses the first spring 45, which acts as a buffer to reduce the impact force of the electric hoist 2. At the same time, the buffer plate 43 pushes the guide rod 44 to move towards the mounting block 41. The guide rod 44 drives the rack 47 to drive the gear 49 to rotate, and the rotating shaft 48 rotates synchronously. When the impact force of the electric hoist 2 returns to zero, the ratchet and pawl mechanism 5 can prevent the rotating shaft 48 from reversing. The gear 49 and the rack 47 mesh to form a self-locking mechanism, preventing the guide rod 44 from retracting. The rebound force of the first spring 45 is mechanically locked, thereby reducing the possibility of the electric hoist 2 rebounding due to spring rebound, reducing rebound noise, and lowering the risk of equipment damage.

[0019] In some embodiments, the ratchet and pawl mechanism 5 includes a ratchet 51 coaxially fixed on a rotating shaft 48, a pawl 52 hinged to a mounting block 41 to engage with the ratchet 51, and a spring piece 53 provided between the outer side of the pawl 52 near the ratchet 51 and the mounting block 41. Specifically, as shown... Figure 2 , 3 As shown, when the buffer plate 43 is pressed and drives the rotating shaft 48 to rotate clockwise, the pawl 52 slides along the back of the ratchet 51 teeth. When the rotating shaft 48 attempts to rotate counterclockwise, the pawl 52 engages with the ratchet 51 teeth to achieve mechanical locking, thereby preventing the first spring 45 from rebounding.

[0020] In some embodiments, an electric telescopic rod 54 is mounted on the mounting block 41. The electric telescopic rod 54 is located inside the end of the pawl 52 away from the ratchet 51, and a connecting rope 55 is fixedly connected between the telescopic end of the electric telescopic rod 54 and the inside of the end of the pawl 52 away from the ratchet 51. Specifically, when the electric hoist 2 retracts to the safe area, the electric telescopic rod 54 is activated to retract. The telescopic rod pulls the end of the pawl 52 away from the ratchet 51 through the connecting rope 55, causing the pawl 52 to rotate around the hinge point and disengage from the ratchet 51, thereby releasing the lock on the rotating shaft 48 so that the first spring 45 can be reset.

[0021] In some embodiments, a buffer pad 410 is fixedly connected to the inner wall of the cavity 42, and the buffer pad 410 corresponds to the end of the guide rod 44 away from the buffer plate 43. Specifically, when the guide rod 44 moves toward the mounting block 41 and impacts the side wall of the cavity 42, the buffer pad 410 plays a buffering role, thereby reducing the impact force of the guide rod 44 on the side wall of the cavity 42 and extending the service life of the safety protection mechanism 4.

[0022] In some embodiments, impact heads 411 are fixedly connected to both ends of the electric hoist 2, and a guide groove 412 adapted to the impact head 411 is provided on the inner side of the buffer plate 43. Specifically, the impact head 411 of the electric hoist 2 matches the guide groove 412 of the buffer plate 43 to ensure that the impact force of the electric hoist 2 is transmitted axially to the safety protection mechanism 4, thereby reducing the possibility of uneven force distribution and failure of the safety protection mechanism 4.

[0023] In some embodiments, two sets of symmetrically arranged buffer mechanisms 6 are installed between the buffer plate 43 and the mounting block 41. Each buffer mechanism 6 includes a groove 61 formed on the side of the mounting block 41 near the buffer plate 43. The groove 61 is arranged along the length of the mounting block 41. A limiting rod 62 parallel to the groove 61 is fixedly connected inside the groove 61. A slider 63 is slidably connected to the limiting rod 62. A second spring 64 is fixedly connected between the slider 63 and one end of the groove 61. The second spring 64 is sleeved on the limiting rod 62. An inclined support rod 65 is hinged between the slider 63 and the buffer plate 43. Specifically, the second spring 64 is located outside the slider 63. When the buffer plate 43 is impacted, the buffer plate 43 pushes the slider 63 to slide outward via the support rod 65. When the slider 63 slides, it can compress the second spring 64, which acts as a buffer, further reducing the impact force of the electric hoist 2 and thus reducing the damage caused by the impact.

[0024] The above embodiments can be combined with each other.

[0025] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. An electric single-girder crane with a safety protection structure, comprising a crane main girder, on which an electric hoist is mounted, characterized in that: Fixed plates are fixedly connected to the bottom surfaces of both ends of the main beam of the crane. A safety protection mechanism is provided on the side of the fixed plate near the electric hoist. The safety protection mechanism includes a mounting block fixed inside the fixed plate. A cavity is opened inside the mounting block. A buffer plate is provided between the mounting block and the electric hoist. A horizontally arranged guide rod is provided between the mounting block and the buffer plate. A first spring sleeved on the guide rod is fixedly connected between the mounting block and the buffer plate. One end of the guide rod is fixedly connected to the buffer plate. The other end of the guide rod extends into the cavity and is slidably connected to the mounting block. A groove is opened axially on the side wall of the guide rod at one end in the cavity. A rack is fixedly connected in the groove. A rotating shaft is rotatably connected in the cavity. A gear that meshes with the rack is fixedly fixed on the rotating shaft. One end of the rotating shaft extends out of the mounting block and is equipped with a ratchet and pawl mechanism.

2. The electric single-girder crane with a safety protection structure according to claim 1, characterized in that: The ratchet and pawl mechanism includes a ratchet coaxially fixed on a rotating shaft, a pawl hinged to a mounting block to engage with the ratchet, and a spring piece between the outer side of the pawl near the ratchet and the mounting block.

3. An electric single-girder crane with a safety protection structure according to claim 2, characterized in that: An electric telescopic rod is installed on the mounting block. The electric telescopic rod is located on the inner side of the end of the pawl away from the ratchet. A connecting rope is fixedly connected between the telescopic end of the electric telescopic rod and the inner side of the end of the pawl away from the ratchet.

4. An electric single-girder crane with a safety protection structure according to claim 1, characterized in that: A buffer pad is fixedly connected to the inner wall of the cavity, and the position of the buffer pad corresponds to the end of the guide rod away from the buffer plate.

5. An electric single-girder crane with a safety protection structure according to claim 1, characterized in that: The electric hoist has impact heads fixedly connected to both ends, and the inner side of the buffer plate has guide grooves that are compatible with the impact heads.

6. An electric single-girder crane with a safety protection structure according to claim 1, characterized in that: Two sets of symmetrically arranged buffer mechanisms are installed between the buffer plate and the mounting block. The buffer mechanism includes a slide groove opened on the side of the mounting block near the buffer plate. The slide groove is arranged along the length direction of the mounting block. A limiting rod parallel to the slide groove is fixedly connected in the slide groove. A slider is slidably connected on the limiting rod. A second spring is fixedly connected between the slider and one end of the slide groove. The second spring is sleeved on the limiting rod. An inclined support rod is hinged between the slider and the buffer plate.

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