Cam limiting external fixing spiral clutch device for lifting opening and closing of grab ship unloader

Abstract

The invention provides a cam limiting external fixing spiral clutch device for lifting opening and closing of a grab ship unloader, and relates to the technical field of bulk cargo wharf grab ship unloaders, which comprises a pinion in clearance fit with a planetary reducer shaft, a bull gear connected with a cam limiting switch through a bolt, and an adjusting bolt in threaded fit with a shaft hole at the end part of the pinion. A shaft shoulder unthreaded hole is formed in the center of the planetary reducer shaft to limit axial movement of the adjusting bolt. The small gear is driven to slide in the axial direction by twisting the adjusting bolt so as to be meshed with or separated from the large gear, the adjusting bolt is reversely rotated before rope replacement to enable the gear to be separated, the large gear is prevented from being driven by rotation of the small gear, and therefore the cam limiting switch shaft is fixed; after the rope is replaced, the gears are meshed through reverse rotation again, and connection is recovered. The device is simple in structure, realizes fixation and reconnection of the limit switch shaft through mechanical transmission, does not need manual disassembly, assembly and debugging, saves manpower and time cost, is low in failure rate, and is suitable for the scene of replacing the steel wire rope of the four-drum grab ship unloader.

Description

Technical Field

[0001] This invention relates to the field of grab unloader technology for bulk cargo terminals, and more particularly to a lifting and closing cam limit external fixed screw clutch device for a grab unloader. Background Technology

[0002] As a core loading and unloading equipment in bulk cargo terminals, grab unloaders rely on grabs to extract materials from the ship's hold into hoppers, and then unload them via a conveying system. In existing technology, a four-drum mechanism drives a wire rope to wind around the grab bucket via a planetary reducer, achieving its reciprocating motion. During the working cycle, the grab bucket needs to trigger the lower and upper limit contacts of the cam limit switch to control its stroke. However, when the wire rope needs periodic replacement due to wear, a single-sided motor drives the planetary reducer for single-action drum operation, causing the shaft connected to the limit switch to rotate synchronously, which in turn leads to malfunction of the cam limit switch contacts.

[0003] The existing solution requires manual removal of the cam limit switch before rope replacement, followed by reinstallation and adjustment after rope replacement. Since the cam limit switch is a mechanical structure, even a small angle of rotation of its shaft can cause relative positional deviations of 6 to 8 contacts, requiring calibration by electrical and mechanical personnel, with an adjustment cycle of up to one day, which is time-consuming and labor-intensive.

[0004] Therefore, there is an urgent need for a device with a simple structure and convenient operation to fix the cam limit switch shaft when changing ropes, so as to avoid the contact position shift, thereby eliminating the debugging process and reducing maintenance costs. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a lifting and closing cam limit external fixing screw clutch device for grab bucket ship unloaders. This invention uses the meshing of a large gear and a small gear, along with the adjustment bolt, to fix the cam limit switch shaft during rope changing, preventing contact misalignment and eliminating the need for debugging.

[0006] To achieve the above objectives, the present invention provides a lifting and closing cam limit external fixed helical clutch device for a grab unloader, comprising: a planetary reducer shaft, a gear set, a mounting bracket, a cam limit switch, and an adjusting bolt; The gear set includes a pinion and a large gear. The pinion is clearance-fitted with the planetary reducer shaft, and the large gear is fixedly connected to the cam limit switch by a bolt set. The mounting bracket is connected to the large gear and the cam limit switch via a bolt group; The external thread of the adjusting bolt engages with the internal thread of the shaft hole at the end of the pinion, and the axial movement of the adjusting bolt is limited by the shoulder hole at the center of the planetary reducer shaft.

[0007] Furthermore, the retainer of the adjusting bolt is fixedly installed inside the planetary reducer shaft, restricting the axial movement of the adjusting bolt and allowing only the adjusting bolt to rotate.

[0008] Furthermore, the reverse rotation of the adjusting bolt drives the pinion to slide outward along the axis of the planetary reducer, so that the pinion is completely disengaged from the large gear, thereby preventing the cam limit switch shaft from rotating during single-action rope changing of the drum.

[0009] Furthermore, the forward rotation of the adjusting bolt drives the pinion to slide along the inner side of the planetary reducer axis, so that the pinion and the large gear are fully engaged, thereby restoring the connection between the cam limit switch and the planetary reducer shaft.

[0010] Furthermore, the shaft of the cam limit switch remains stationary when the gear is disengaged, to prevent its trigger point position from shifting due to the rotation of the pinion.

[0011] Furthermore, the large gear and the cam limit switch are rigidly connected by a bolt group to ensure synchronization during transmission.

[0012] Furthermore, the shoulder hole at the center of the planetary reducer shaft engages with the adjusting bolt, thereby limiting the axial displacement of the adjusting bolt and ensuring precise axial sliding of the pinion.

[0013] The present invention also provides a four-drum mechanism for a grab unloader, including the above-mentioned lifting and closing cam limit external fixed spiral clutch device for the grab unloader.

[0014] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. The present invention provides a lifting and closing cam limit external fixing screw clutch device for a grab bucket unloader. Through the mechanical structure of gear meshing and adjusting bolts, the cam limit switch shaft is fixed when changing ropes, avoiding contact misalignment. After changing ropes, there is no need to readjust the limit switch, saving the complicated process of coordination between electrical and mechanical personnel. The single rope change and adjustment time is shortened from 1 day to zero, saving manpower and time costs.

[0015] 2. The present invention provides a lifting and closing cam limit external fixed helical clutch device for a grab bucket unloader. The device adopts a combination design of gear set and adjusting bolt. The axial movement of the adjusting bolt is limited by the shoulder hole of the planetary reducer shaft. It has a compact structure, low cost, no complex electronic components, and extremely low failure rate, making it suitable for the high-intensity operation environment of port equipment.

[0016] 3. The present invention provides a lifting and closing cam limit external fixed spiral clutch device for a grab bucket unloader. The engagement and disengagement of gears can be achieved by rotating the adjusting bolt. The operation steps are simple, and there is no need to disassemble the limit switch or adjust the trigger point position. This significantly improves the convenience of rope replacement and maintenance, and avoids the problem of limit switch failure due to human operation error. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a grab bucket unloader lifting and closing cam limiting external fixed spiral clutch device according to the present invention; Figure 2 This is an enlarged schematic diagram of point A of the lifting and closing cam limiting external fixed spiral clutch device of the grab unloader of the present invention; Figure 3 This is a schematic diagram of the adjusting bolt baffle of the lifting and closing cam limit external fixed spiral clutch device of the grab bucket unloader according to the present invention; Figure 4 This is a schematic diagram of the planetary reducer shaft of the lifting and closing cam limit external fixed helical clutch device for a grab unloader according to the present invention. Figure 5 This is a schematic diagram of the large gear and small gear disengaged in the lifting and closing cam limiting external fixed spiral clutch device of the grab bucket unloader according to the present invention. Figure 6 This is a schematic diagram of a four-drum mechanism applied to a grab bucket unloader, as described in this invention.

[0019] In the diagram: 1. Planetary reducer shaft; 2. Large gear; 3. Mounting bracket; 4. Cam limit switch; 5. Small gear; 6. Adjusting bolt; 7. Shaft shoulder; 8. Stop plate. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0027] like Figures 1 to 6 As shown, the present invention provides a lifting and closing cam limit external fixed helical clutch device for a grab unloader, comprising: a planetary reducer shaft 1, a gear set, a mounting bracket 3, a cam limit switch 4, and an adjusting bolt 6; The gear set includes a pinion 5 and a large gear 2. The pinion 5 is clearance-fitted with the planetary reducer shaft 1, and lubricant is applied between them to reduce friction. The end hole of the pinion 5 is machined with an internal thread, which forms a threaded fit with the external thread of the adjusting bolt 6. The large gear 2 is fixedly connected to the cam limit switch 4 by a bolt set to form a rigid whole. The mounting bracket 3 is connected to the large gear 2 and the cam limit switch 4 by a bolt set. The axial movement of the adjusting bolt 6 is limited by the smooth hole of the shoulder 7 at the center of the planetary reducer shaft 1 to ensure the precise sliding of the pinion 5 along the axial direction and avoid poor gear meshing or incomplete disengagement due to misalignment. The axial sliding of the pinion 5 is achieved through clearance fit and thread drive, which is simple in structure and low in cost. The rigid connection between the large gear 2 and the cam limit switch 4 ensures transmission synchronization and avoids the need for readjustment after changing the rope.

[0028] Furthermore, the retainer 8 of the adjusting bolt 6 is fixedly installed inside the planetary reducer shaft 1, restricting the axial movement of the adjusting bolt 6 and allowing only the adjusting bolt 6 to rotate. By restricting the axial displacement of the adjusting bolt 6 through the retainer 8, it is ensured that the pinion 5 can slide axially only by rotating the adjusting bolt 6, which is convenient to operate and highly reliable.

[0029] Furthermore, the reverse rotation of the adjusting bolt 6 before rope replacement drives the small gear 5 to slide outward along the planetary reducer shaft 1, so that the small gear 5 is completely disengaged from the large gear 2. This ensures that the cam limit switch 4 shaft does not rotate during single-action rope replacement of the drum. After the small gear 5 is disengaged from the large gear 2, the rotation of the small gear 5 will not drive the cam limit switch 4 shaft to rotate, thus avoiding the offset of the trigger point position. There is no need to readjust the limit switch during rope replacement.

[0030] Furthermore, after the rope is replaced, adjusting the forward rotation of the adjusting bolt 6 drives the small gear 5 to slide inward along the planetary reducer shaft 1, so that the small gear 5 and the large gear 2 are fully engaged, thereby restoring the connection between the cam limit switch 4 and the planetary reducer shaft 1. After the small gear 5 and the large gear 2 are engaged, the connection between the cam limit switch 4 and the planetary reducer shaft 1 is restored. The transmission synchronization is guaranteed by the rigid connection of the bolt group, and it can be used directly after the rope is replaced without adjustment.

[0031] Furthermore, the shaft of the cam limit switch 4 remains stationary when the gear is disengaged, to prevent its trigger point position from shifting due to the rotation of the pinion 5.

[0032] Furthermore, the large gear 2 and the cam limit switch 4 are rigidly connected by a bolt group to ensure synchronization during transmission. The rigid connection eliminates transmission gaps and ensures the accuracy of the trigger point of the cam limit switch 4, so that no recalibration is required after changing the rope.

[0033] Furthermore, the shoulder 7 at the center of the planetary reducer shaft 1 has a light hole that cooperates with the adjusting bolt 6. By limiting the axial displacement of the adjusting bolt 6, the pinion 5 is ensured to slide precisely along the axial direction. Through the limiting effect of the shoulder 7 light hole, the adjusting bolt 6 can only rotate, and the sliding direction of the pinion 5 along the axial direction is precisely controllable, thereby improving the reliability of the device.

[0034] like Figure 6 As shown, the present invention also provides a four-drum mechanism for a grab unloader, including the above-mentioned lifting and closing cam limit external fixed spiral clutch device for the grab unloader.

[0035] Detailed implementation process of this device: First, the pinion 5 and the planetary reducer shaft 1 are fitted with a clearance fit. The external thread of the adjusting bolt 6 is fitted with the internal thread of the shaft hole at the end of the pinion 5. The shoulder 7 at the center of the planetary reducer shaft 1 restricts the axial displacement of the adjusting bolt 6, allowing only its rotation.

[0036] Before changing the rope, rotate the adjusting bolt 6 in the opposite direction. The thread of the adjusting bolt 6 drives the small gear 5 to slide outward along the planetary reducer shaft 1 until the small gear 5 is completely disengaged from the large gear 2. At this time, the cam limit switch 4 shaft remains stationary because the large gear 2 is stationary, thus preventing the trigger point from shifting.

[0037] After the rope is changed, rotate the adjusting bolt 6 in the forward direction. The small gear 5 slides along the inner side of the axis and fully meshes with the large gear 2, restoring the connection between the cam limit switch 4 and the planetary reducer shaft 1.

[0038] The entire process controls the disengagement and engagement of the gear set by adjusting the rotation direction of bolt 6, and ensures the accuracy of the sliding of pinion 5 by utilizing the limiting effect of the light hole on the shaft shoulder 7. Ultimately, it achieves the function of keeping the limit switch shaft stationary during rope changing and being used directly after rope changing, saving debugging time and labor costs.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lifting and closing cam limiting external fixed helical clutch device for a grab bucket ship unloader, characterized in that, include: Planetary reducer shaft, gear set, mounting bracket, cam limit switch, adjusting bolts; The gear set includes a pinion and a large gear. The pinion is clearance-fitted with the planetary reducer shaft, and the large gear is fixedly connected to the cam limit switch by a bolt set. The mounting bracket is connected to the large gear and the cam limit switch via a bolt group; The external thread of the adjusting bolt engages with the internal thread of the shaft hole at the end of the pinion, and the axial movement of the adjusting bolt is limited by the shoulder hole at the center of the planetary reducer shaft.

2. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The retainer plate of the adjusting bolt is fixedly installed inside the planetary reducer shaft, restricting the axial movement of the adjusting bolt and allowing only the adjusting bolt to rotate.

3. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The reverse rotation of the adjusting bolt drives the small gear to slide along the outer side of the planetary reducer axis, so that the small gear is completely disengaged from the large gear, so that the cam limit switch shaft does not rotate when the drum is changing rope in a single action.

4. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The forward rotation of the adjusting bolt drives the pinion to slide along the inner side of the planetary reducer axis, so that the pinion and the large gear are fully engaged, thereby restoring the connection between the cam limit switch and the planetary reducer shaft.

5. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The shaft of the cam limit switch remains stationary when the gear is disengaged, preventing the trigger point from shifting due to the rotation of the pinion.

6. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The large gear and the cam limit switch are rigidly connected by a bolt group to ensure synchronization during transmission.

7. The grab bucket unloader lifting and closing cam limiting external fixed screw clutch device according to claim 1, characterized in that, The shoulder hole at the center of the planetary reducer shaft engages with the adjusting bolt, thereby limiting the axial displacement of the adjusting bolt and ensuring precise axial sliding of the pinion.

8. A four-drum mechanism applied to a grab bucket unloader, characterized in that, Includes any one of the grab bucket unloader lifting opening and closing cam limit external fixed screw clutch devices as described in claims 1 to 7.

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