Chain wheel locking structure

Abstract

The utility model belongs to the field of stacking equipment, concretely relates to a chain wheel locking structure. The utility model provides a chain wheel locking structure, including drive shaft and chain wheel connected with drive shaft, still include: the ratchet wheel connected with drive shaft, one end articulates the brake lever on the frame body, the other end of brake lever is equipped with the sharp claw that can insert the gear slot of ratchet wheel and prevent the rotation of ratchet wheel, and, the linear drive device articulates on the frame body, the other end of brake lever is articulated with the output of linear drive device, and linear drive device pulls the sharp claw and separates the gear slot of ratchet wheel and inserts. The utility model provides a chain wheel locking structure, when the sharp claw inserts the gear slot, the ratchet wheel cannot rotate, and further prevent the rotation of chain wheel, realize the function of instantaneous braking, the utility model's special sharp claw structure and ratchet structure make the brake lever and ratchet wheel form dead point stress, and stress is stronger, more stable.

Description

Technical Field

[0001] This utility model belongs to the field of palletizing equipment, and specifically relates to a sprocket locking structure. Background Technology

[0002] In industrial palletizing operations, sprocket drives, with their stable transmission efficiency and high load-bearing capacity, have become the core transmission component for vertically lifting grippers or palletized items, and are widely used in various automated palletizing equipment. These devices use the meshing transmission of sprockets and chains to drive the actuator to complete the layer-by-layer lifting and orderly stacking of items, making them a key device for improving production efficiency and ensuring palletizing consistency.

[0003] As palletizing heights continue to increase, the need for equipment safety protection becomes increasingly prominent. If the sprocket drive system fails, the grippers or items to be palletized may fall due to gravity, causing serious safety accidents such as equipment damage, product destruction, or even personal injury. Therefore, equipping the sprocket drive structure with a reliable braking function has become a core element in ensuring the safety of palletizing operations.

[0004] Currently, the mainstream braking solutions in the industry are mainly divided into two categories: electric braking and brake pad braking. Electric braking achieves braking by cutting off the power source and using electromagnetic force, while brake pad braking relies on the mechanical contact between the friction pads and the brake disc to generate braking force. Both methods are based on traditional braking principles and meet basic safety requirements. However, due to the inertia of mechanical transmission and the delay in braking response, both types of braking solutions have an unavoidable buffer period in practical applications: after the braking command is issued, the actuator cannot stop moving immediately and will continue to move a certain distance along the original trajectory.

[0005] This inertial buffering phenomenon not only affects palletizing accuracy, leading to problems such as offsetting and tipping in high-level palletizing, but more importantly, in extreme scenarios such as sudden failure of the transmission system, the presence of the buffer section prolongs the braking response time, weakens the safety protection effect, and makes it impossible to achieve instantaneous locking of the sprocket. This shortcoming of existing braking technology has become a significant factor restricting the improvement of the safety performance of palletizing equipment, and there is an urgent need to develop new braking devices that can overcome inertial buffering and achieve instantaneous braking to meet the actual needs of high-safety palletizing operations. Utility Model Content

[0006] The sprocket locking structure provided by this utility model can effectively solve the problems in the background art.

[0007] This utility model provides a sprocket locking structure, including a drive shaft and a sprocket connected to the drive shaft, and further including:

[0008] A ratchet connected to the drive shaft;

[0009] A brake lever is hinged to the frame at one end, and a pawl at the other end of the brake lever is provided to insert into the ratchet and prevent the ratchet from rotating.

[0010] In addition, a linear drive device hinged to the frame, the output end of which is hinged to the other end of the brake lever, the linear drive device pulling the pawl to engage and disengage from the tooth groove of the ratchet.

[0011] As a further optimization of this utility model, the sprocket and the ratchet are adjacent and connected to the drive shaft key through the same key.

[0012] As a further optimization of this utility model, each ratchet tooth on the ratchet is formed into a pointed shape by a first surface and a second surface. The first surface of each ratchet tooth is coplanar with the axis of the ratchet, and the second surface of each ratchet tooth forms an angle θ with the first surface of its adjacent ratchet tooth.

[0013] The pawl is a right-angled triangle shape adapted to the shape of the pawl tooth groove. One right-angled surface of the pawl falls on the brake lever, and the apex angle at which the pawl inserts into the tooth groove is θ.

[0014] When the gripper is engaged in the tooth groove, the other right-angled surface of the pawl is coplanar with the axis of the ratchet.

[0015] As a further optimization of this utility model, θ is 60°.

[0016] As a further optimization of this utility model, the linear drive device is a cylinder.

[0017] As a further optimization of this utility model, it also includes a hinge shaft with one end fixed to the frame, and the other end of the hinge shaft is hinged to one end of the brake rod through a bearing, with the hinge shaft perpendicular to the brake rod.

[0018] As a further optimization of this utility model, the tips of the ratchet and the tips of the claws are both provided with rounded corners.

[0019] This utility model provides a sprocket locking structure. When the pawl is inserted into the tooth groove, the ratchet cannot rotate, thereby preventing the sprocket from rotating and achieving the function of instantaneous braking. The unique pawl structure and ratchet structure of this utility model make the brake lever and ratchet form a dead point for force, resulting in stronger and more stable force. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the application scenario of this embodiment;

[0021] Figure 2 yes Figure 1 Enlarged view of a portion;

[0022] Figure 3 This is a schematic diagram of the brake lever structure in this embodiment;

[0023] Figure 4This is a schematic diagram of the ratchet structure in this embodiment;

[0024] Figure 5 yes Figure 4 Front view of the structural diagram;

[0025] Among them, drive shaft 1, sprocket 2, ratchet 3, ratchet 3a, first surface 3a1, second surface 3a2, tooth groove 3b, brake lever 4, pawl 4a, cylinder 5, hinge shaft 6, frame 7. Detailed Implementation

[0026] like Figure 1-5 As shown, the locking structure of this embodiment is applied to a palletizing elevator. The elevator adopts a sprocket drive structure, and in this embodiment, the sprocket 2 is braked.

[0027] This embodiment includes a drive shaft 1, a sprocket 2, a ratchet 3, a brake lever 4, and a linear drive device.

[0028] The motor drives the drive shaft 1 to rotate, and the sprocket 2 is mounted on the drive shaft 1 and is driven to rotate by the drive shaft 1.

[0029] Ratchet 3 is also mounted on drive shaft 1. Specifically, in this embodiment, ratchet 3 is adjacent to sprocket 2, and both sprocket 2 and ratchet 3 are keyed to drive shaft 1. Both are connected to drive shaft 1 using the same key to reduce the processing and installation costs of the parts.

[0030] One end of the brake lever 4 is hinged to the frame 7. Specifically, this embodiment also includes a hinge shaft 6, one end of which is fixed to the frame 7, and the other end of which is fitted with a bearing. One end of the brake lever 4 is fitted onto the bearing and hinged to the hinge shaft 6.

[0031] In this embodiment, the hinge shaft 6 is parallel to the drive shaft 1, and the brake lever 4 is perpendicular to both the hinge shaft 6 and the drive shaft 1.

[0032] The other end of the brake lever 4 is provided with a pawl 4a. The shape of the pawl 4a corresponds to the tooth groove 3b of the ratchet 3. After the pawl 4a is inserted into the tooth groove 3b, it can prevent the ratchet 3 from rotating.

[0033] In this embodiment, the linear drive device specifically adopts cylinder 5, but in other embodiments, a hydraulic cylinder may also be used.

[0034] The mounting end of cylinder 5 is hinged to frame 7, and the output end of cylinder 5 is hinged to the other end of brake lever 4. When cylinder 5 performs telescopic movement, it can pull brake lever 4 to swing back and forth around hinge axis 6, thereby causing pawl 4a to insert into or disengage from tooth groove 3b.

[0035] When the pawl 4a is inserted into the tooth groove 3b, the ratchet 3 cannot rotate, thus preventing the sprocket 2 from rotating and achieving the function of instantaneous braking; when the pawl 4a is disengaged from the tooth groove 3b, the ratchet 3 can rotate freely, and thus the sprocket 2 can rotate freely again.

[0036] Preferably, in this embodiment, each ratchet tooth 3a on the ratchet 3 is a pointed shape formed by a first surface 3a1 and a second surface 3a2, wherein the first surface 3a1 is coplanar with the axis of the ratchet 3, and the second surface 3a2 forms an angle θ with the first surface 3a1 of its adjacent ratchet tooth 3a. In this embodiment, θ is 60°. In other embodiments, θ can also be 50° or 70° or other angles.

[0037] The claw 4a is a right-angled triangle. One of the right-angled surfaces of the claw 4a falls on the brake lever 4, that is, the right-angled surface coincides with the brake lever 4. The angle of the claw 4a inserted into the tooth groove 3b is also θ, that is, 60°.

[0038] With the pawl 4a engaged in the tooth groove 3b, the other right-angled surface of the pawl 4a is coplanar with the central axis of the ratchet 3. In this embodiment, the brake lever 4 is located below the ratchet 3, and at this time, the brake lever 4 is in a horizontal state. At this time, the first surface 3a1 of the ratchet 3a is in contact with the other right-angled surface of the pawl 4a, and the force exerted by the rotation of the ratchet 3a on the pawl 4a is exactly in the horizontal direction. At this time, the direction of the braking force and the direction of the force of the cylinder 5 form a dead point. The pawl 4a is also a right-angled triangle, so the force is most reasonable. Therefore, when designing the rotation direction of the sprocket 2, the direction of rotation of the pawl 4a by the first surface 3a1 of the ratchet 3a is the downward direction of the lifting mechanism.

[0039] Preferably, in this embodiment, the tip of the ratchet 3a has a rounded corner, and the center of the rounded corner coincides with the center of the ratchet 3. Simultaneously, the tip of the pawl 4a also has the same rounded corner as the ratchet 3a, and the center of the rounded corner of the pawl 4a is located on its right-angled surface that can fit against the first surface 3a1 of the tooth groove 3b. With this structure, when the ratchet 3a rotates, the rounded corner of the ratchet 3a contacts the rounded corner of the pawl 4a during the insertion into the tooth groove 3b, allowing the pawl 4a to insert into the tooth groove 3b well along the curvature of the rounded corner.

[0040] It should be understood that the descriptions of directions or positional relationships such as up, down, left, right, front, back, top, bottom, tail, horizontal, and vertical in this application are all based on the accompanying drawings in the specification and are only used to more clearly express the technical solution and simplify the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A sprocket locking structure, comprising a drive shaft and a sprocket connected to the drive shaft, characterized in that, Also includes: A ratchet connected to the drive shaft; A brake lever is hinged to the frame at one end, and a pawl at the other end of the brake lever is provided to insert into the ratchet and prevent the ratchet from rotating. In addition, a linear drive device hinged to the frame, the output end of which is hinged to the other end of the brake lever, the linear drive device pulling the pawl to engage and disengage from the tooth groove of the ratchet.

2. The sprocket locking structure according to claim 1, characterized in that, The sprocket and ratchet are adjacent and connected to the drive shaft key via the same key.

3. The sprocket locking structure according to claim 1, characterized in that, Each ratchet tooth on the ratchet has a first face and a second face forming a sharp angle. The first face of each ratchet tooth is coplanar with the axis of the ratchet, and the second face of each ratchet tooth forms an angle θ with the first face of its adjacent ratchet tooth. The pawl is a right-angled triangle shape adapted to the shape of the pawl tooth groove. One right-angled surface of the pawl falls on the brake lever, and the apex angle at which the pawl inserts into the tooth groove is θ. When the gripper is engaged in the tooth groove, the other right-angled surface of the pawl is coplanar with the axis of the ratchet.

4. The sprocket locking structure according to claim 1, characterized in that, θ is 60°.

5. A sprocket locking structure according to claim 1, characterized in that, The linear drive device is a cylinder.

6. The sprocket locking structure according to claim 1, characterized in that, It also includes a hinge shaft with one end fixed to the frame, and the other end of the hinge shaft is hinged to one end of the brake lever through a bearing. The hinge shaft is perpendicular to the brake lever.

7. The sprocket locking structure according to claim 1, characterized in that, The tips of the ratchet teeth and the tips of the claws are rounded.

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