Shaft pin coupling
The pin coupling with a graded overload protection mechanism solves the problems of easy damage and high maintenance costs of traditional couplings in heavy-duty equipment, and achieves rapid overload protection and reuse, thereby reducing maintenance costs.
Patent Information
- Application Number
- CN202520331112.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Traditional pin couplings are prone to damage or require complete replacement in heavy-duty equipment due to the lack of a buffer mechanism, and they cannot adapt to different load changes, resulting in high maintenance costs and low practicality.
It adopts a graded overload protection mechanism, which uses a sliding ring and a reset elastic element to achieve buffering, and the linkage between the trigger post and the limit post to automatically disengage the connection, avoid damage to the parts, and can be reused.
It enables rapid overload response, avoids component damage, reduces maintenance costs, adapts to different working conditions, is easy to operate, and has short downtime.
Smart Images
Figure CN223648364U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coupling technology, and more specifically, to a pin coupling. Background Technology
[0002] A coupling is a device that connects two shafts or a shaft and a rotating component, rotating together during the transmission of motion and power, and remaining connected under normal conditions. It is sometimes also used as a safety device to prevent the connected components from bearing excessive loads, providing overload protection. Traditional pin couplings face significant challenges in heavy-duty equipment (such as mining machinery, stamping equipment, and large transmission systems): when the equipment suddenly starts, stops, or malfunctions, the coupling will be subjected to instantaneous impact loads far exceeding its design values. In existing technologies, ordinary rigid couplings (such as flange couplings) lack a buffering mechanism and are prone to permanent deformation or even breakage due to overload; while flexible couplings (such as lapel couplings and leaf couplings) can absorb some impact, their elastic elements may undergo irreversible deformation under extreme loads, losing their protective function. Some couplings that provide overload protection typically achieve transmission interruption by shearing off a shear pin, thus protecting critical components in the transmission system. However, these couplings are often unusable and require replacement of parts before they can be used again. Furthermore, the shear pin requires complete replacement after breakage, resulting in high maintenance costs. Additionally, the shear pin's fracture threshold is relatively fixed, making it difficult to adapt to varying loads on different machines, thus limiting its practicality. Therefore, a coupling that can quickly respond to overloads, automatically disengage from protection, and be repeatedly reused is needed. Utility Model Content
[0003] The purpose of this utility model is to provide a pin coupling that solves the problem that when a general coupling is used for overload protection, parts or the whole may be damaged and cannot be reused in time.
[0004] The embodiments of this utility model are achieved through the following technical solutions:
[0005] A pin coupling includes a first half-coupling and a second half-coupling.
[0006] Both the first half-coupling and the second half-coupling include a bushing and a connecting seat; the connecting seat has several axially penetrating movable grooves inside in the circumferential direction; a connecting sleeve is slidably disposed in the movable grooves; the connecting seat has an annular groove inside, which is sequentially connected to several movable grooves; a sliding ring fixed to all the connecting sleeves is slidably disposed in the annular groove; a first reset elastic element is disposed in the movable groove, with its two ends respectively connected to the side wall of the movable groove and the outer wall of the connecting sleeve;
[0007] The first half-coupling has a limiting hole on the side wall of the connecting sleeve and a trigger post on the side wall of the movable through groove; the second half-coupling has a sliding pin inside the connecting sleeve, one end of the pin is connected to one end of the connecting sleeve through a second reset elastic element; the other end of the pin has a retractable limiting post on the side wall.
[0008] The first reset elastic element is a first spring, which is respectively wrapped around the sliding rings on both sides of the connecting sleeve.
[0009] The connecting sleeve has corresponding limiting holes on both pairs of side walls; the movable through groove has trigger pins on both pairs of side walls corresponding to the limiting holes.
[0010] The connecting sleeve of the second half-coupling has a fixed end plate at the end away from the first half-coupling; the second reset elastic element is a second spring, with its two ends connected to the fixed end plate and the end of the pin away from the first half-coupling, respectively.
[0011] The fixed end plate is provided with an insertion hole that passes through the inside of the connecting sleeve; the second spring is arranged around the insertion hole.
[0012] The pin has a cavity at one end, and a reset gear is rotatably mounted in the cavity. Sliding holes are provided on both sides of the cavity. Limiting posts are slidably mounted in the sliding holes on both sides. A toothed plate is horizontally mounted on the end of the limiting post near the cavity, so that the toothed plates on the limiting posts on both sides mesh with the upper and lower sides of the reset gear.
[0013] The top of the cavity is also provided with a sliding hole, through which a pressing post is slidably provided; a toothed plate is vertically provided at one end of the pressing post near the cavity and meshes with one side of the reset gear; and the toothed plate at one end of the pressing post and the toothed plate on the limiting post are spaced apart along the axial direction of the reset gear.
[0014] The limiting post and the pressing post are respectively provided with retaining rings at the ends near the cavity.
[0015] A reset spring is provided on the shaft of the reset gear.
[0016] It also includes a pair of positioning seats, which are respectively located at the center of the connecting seat side of the first half coupling and the second half coupling on both sides; positioning pins and positioning grooves are respectively provided on the opposite side surfaces of the positioning seats on both sides; when the first half coupling and the second half coupling on both sides are connected, the positioning pins are engaged in the positioning grooves.
[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:
[0018] 1. This utility model discloses a pin coupling that employs a graded overload protection mechanism. Under normal operating conditions, the first spring, through the sliding ring, links all connecting sleeves to uniformly absorb vibration energy, forming a first-level buffer. When an overload impact causes the moving amount of the connecting sleeve to exceed a threshold, the side wall of the connecting sleeve contacts the side wall of the movable through groove, causing the trigger pin to extend into the limiting hole and push out the limiting pin. Under the action of the second spring, the pin disengages, realizing the disconnection of the half-couplings on both sides, thus achieving the effect of the second-level protection. Furthermore, by adjusting the stiffness of the first spring, the impact load threshold can be set, allowing this device to be applied to instruments under different operating conditions, thus improving its practicality.
[0019] 2. This utility model provides a pin coupling that enables damage-free disengagement. When the workpiece is overloaded, the pin retracts due to the retraction of the limiting post and automatically exits the connecting sleeve of the first half of the coupling under the action of the second spring, thus avoiding damage to the parts. After the impact is eliminated, the coupling can be aligned and the pin can be reinserted into the connecting sleeve for reuse. The reset time is short, the operation is simple and convenient, and there is no damage to the parts, which reduces maintenance costs and shortens downtime. Moreover, the entire device is made of mechanical structure without electronic components, and can work stably in various environments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 It is attached Figure 1 Sectional view at point aa;
[0022] Figure 3 It is attached Figure 1 Sectional view at point bb;
[0023] Figure 4 It is attached Figure 3 Enlarged view of point A in the middle;
[0024] Figure 5 It is attached Figure 3 Enlarged view of point B in the middle;
[0025] Figure 6 This is a schematic diagram of the first half of the coupling;
[0026] Figure 7 This is a schematic diagram of the second half of the coupling;
[0027] Figure 8 It is attached Figure 7 A cross-sectional view of the pin at point C.
[0028] In the diagram, 101-shoulder sleeve, 102-connecting seat, 103-movable through groove, 104-ring groove, 201-connecting sleeve, 2011-limiting hole, 2012-fixed end plate, 2013-second spring, 2014-insertion hole, 202-sliding ring, 203-first spring, 204-trigger pin, 3-pin, 301-cavity, 302-reset gear, 303-limiting pin, 304-tooth plate, 305-pressing pin, 4-positioning seat, 401-positioning pin, 402-positioning groove. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0031] like Figure 1 and 2 As shown, a pin coupling includes a first half coupling and a second half coupling; both the first half coupling and the second half coupling include a bushing 101 and a connecting seat 102; the bushing 101 is used to connect to the shafts on both sides respectively; the connecting seat 102 is cylindrical, and its interior has four axially penetrating movable slots 103 arranged in the circumferential direction; the interior of the connecting seat 102 is provided with an annular groove 104, which sequentially connects the four movable slots 103; a connecting sleeve 201 is slidably arranged in the movable slots 103, the connecting sleeve 201 is hollow inside and penetrates in the axial direction of the connecting seat 102; a sliding ring is provided in the annular groove 104.
[0032] 202, the sliding ring 202 is sequentially connected to multiple connecting sleeves 201, which allows the sliding ring 202 to move along the ring groove 104, and the connecting sleeves 201 can also move in the movable through groove 103; the movable through groove 103 is provided with a first reset elastic element, preferably a first spring 203, which is respectively arranged around the sliding rings 202 on both sides of the connecting sleeve 201; the two ends of the first spring 203 are respectively connected to the side wall of the movable through groove 103 and the outer side wall of the connecting sleeve 201, so that after the connecting sleeve 201 moves in the movable through groove 103, it is reset to the middle position under the action of the spring.
[0033] like Figure 3 and 4 As shown, the connecting sleeve 201 of the first half coupling is provided with limiting holes 2011 on both pairs of side walls; and trigger pins 204 are provided on both pairs of side walls of its movable through groove 103 corresponding to the limiting holes 2011; so that when the connecting sleeve 201 moves in the movable through groove 103, the trigger pins 204 can extend into the limiting holes 2011.
[0034] like Figure 3 and 5 As shown, a pin 3 is slidably provided inside the connecting sleeve 201 of the second half-coupling; a fixed end plate 2012 is provided at the end of the connecting sleeve 201 away from the first half-coupling, and the fixed end plate 2012 is also provided with an insertion hole 2014 that extends through the inside of the connecting sleeve 201. The insertion hole 2014 is used to insert a tool from the outside to push the pin 3 out along the connecting sleeve 201; the end of the pin 3 away from the first half-coupling is connected to the fixed end plate 2012 through a second reset elastic element, so that the pin 3 returns to its original position after moving in the connecting sleeve 201; the second reset elastic element is preferably a second spring. 2013, and set around the insertion hole 2014; the two pairs of side walls at the other end of the pin 3 are respectively provided with retractable limiting posts 303; when the first half coupling and the second half coupling are connected relative to each other, one end of the two connecting sleeves 201 are respectively attached to each other, and then the pin 3 in the connecting sleeve 201 of the second half coupling is pushed out and moves toward the first half coupling, so that the pin 3 is inserted into the connecting sleeve 201 of the first half coupling, and the limiting post 303 is slid into the limiting hole 2011, so that the first half coupling and the second half coupling are relatively fixed;
[0035] like Figure 6 and 7 As shown, a positioning seat 4 is provided at the center of one side of the connecting seat 102 of the first half coupling and the second half coupling on both sides; a positioning pin 401 and a positioning groove 402 are respectively provided on the opposite sides of the positioning seats 4 on both sides; when the first half coupling and the second half coupling on both sides are connected, the positioning pin 401 is engaged in the positioning groove 402, so that the shafts of the two half couplings are aligned and quickly connected.
[0036] like Figure 8As shown, the pin 3 has a cavity 301 inside one end, and a reset gear 302 is rotatably mounted in the cavity 301. Sliding holes are provided on both sides and the top of the cavity 301. Limiting posts 303 are slidably mounted in the sliding holes on both sides, and a pressing post 305 is slidably mounted in the sliding hole at the top. A toothed plate 304 is horizontally mounted on the end of the limiting post 303 near the cavity 301, so that the toothed plates 304 on the two limiting posts 303 mesh with the upper and lower sides of the reset gear 302, allowing the two limiting posts 303 to slide simultaneously towards or away from each other. A toothed plate 304 is vertically mounted on the end of the pressing post 305 near the cavity 301. The toothed plate 304 on one side of the push post 305 meshes with the reset gear 302, and the toothed plate 304 on the limit post 303 is spaced apart along the axial direction of the reset gear 302, so that the multiple toothed plates 304 will not interfere with each other when they move. When the push post 305 moves downward, the reset gear 302 can rotate, and the limit posts 303 on both sides can slide towards each other into the cavity 301 at the same time. By setting the dimensions of the limit post 303, the reset gear 302 and the toothed plate 304, the limit post 303 will not slide out of the sliding hole when it moves inward to the limit, and one end of its surface is flush with or close to the side wall of the pin 3.
[0037] More specifically, the limiting post 303 and the pressing post 305 are respectively provided with retaining rings at one end near the cavity 301, so that the limiting post 303 and the pressing post 305 will not slide out of the sliding hole; and the shaft of the reset gear 302 is provided with a reset spring, so that the reset gear 302 can be reset after rotation, and the limiting posts 303 and the pressing post 305 on both sides can extend out of the sliding hole.
[0038] The working principle of this embodiment is as follows:
[0039] This utility model discloses a pin coupling. When the first half coupling and the second half coupling are connected relative to each other, one end of the connecting sleeves 201 on both sides are respectively fitted together. Then, a tool is inserted into the insertion hole 2014 at one end of the connecting sleeve 201 of the second half coupling, pushing out the pin 3 and moving it toward the first half coupling, so that the second spring 2013 is stretched and the pin 3 is inserted into the connecting sleeve 201 of the first half coupling. Then, when the limiting post 303 moves to the limiting hole 2011, the reset gear 302 is reset under the action of the reset spring, driving the limiting posts 303 on both sides to slide out of the sliding hole and slide into the limiting hole 2011 at the same time, fixing the first half coupling and the second half coupling relative to each other. During operation, when an overload impact causes the connecting sleeve 201 to move beyond a threshold, the side wall of the connecting sleeve 201 contacts the side wall of the movable through groove 103, causing the trigger pin 204 to extend into the limiting hole 2011 and push out the limiting pin 303. Under the action of the second spring 2013, the pin 3 is pulled away from the connecting sleeve 201 of the first half-coupling and returns to the connecting sleeve 201 of the second half-coupling, thus disconnecting the half-couplings on both sides.
[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A pin coupling, comprising a first half-coupling and a second half-coupling, characterized in that, Both the first half-coupling and the second half-coupling include a bushing and a connecting seat; the connecting seat has several axially penetrating movable grooves inside in the circumferential direction; a connecting sleeve is slidably disposed in the movable grooves; the connecting seat has an annular groove inside, which is sequentially connected to several movable grooves; a sliding ring fixed to all the connecting sleeves is slidably disposed in the annular groove; a first reset elastic element is disposed in the movable groove, with its two ends respectively connected to the side wall of the movable groove and the outer wall of the connecting sleeve; The first half-coupling has a limiting hole on the side wall of the connecting sleeve and a trigger post on the side wall of the movable through groove; the second half-coupling has a sliding pin inside the connecting sleeve, one end of the pin is connected to one end of the connecting sleeve through a second reset elastic element; the other end of the pin has a retractable limiting post on the side wall.
2. A shaft pin coupling according to claim 1, wherein, The first reset elastic element is a first spring, which is respectively wrapped around the sliding rings on both sides of the connecting sleeve.
3. A shaft pin coupling according to claim 1, wherein, The connecting sleeve has corresponding limiting holes on both pairs of side walls; the movable through groove has trigger pins on both pairs of side walls corresponding to the limiting holes.
4. A shaft pin coupling according to claim 1, wherein, The connecting sleeve of the second half-coupling has a fixed end plate at the end away from the first half-coupling; the second reset elastic element is a second spring, with its two ends connected to the fixed end plate and the end of the pin away from the first half-coupling, respectively.
5. A shaft pin coupling according to claim 4, wherein, The fixed end plate is provided with an insertion hole that passes through the inside of the connecting sleeve; the second spring is arranged around the insertion hole.
6. A shaft pin coupling according to claim 1, wherein, The pin has a cavity at one end, and a reset gear is rotatably mounted in the cavity. Sliding holes are provided on both sides of the cavity. Limiting posts are slidably mounted in the sliding holes on both sides. A toothed plate is horizontally mounted on the end of the limiting post near the cavity, so that the toothed plates on the limiting posts on both sides mesh with the upper and lower sides of the reset gear.
7. A shaft pin coupling according to claim 6, wherein, The top of the cavity is also provided with a sliding hole, through which a pressing post is slidably provided; a toothed plate is vertically provided at one end of the pressing post near the cavity and meshes with one side of the reset gear; and the toothed plate at one end of the pressing post and the toothed plate on the limiting post are spaced apart along the axial direction of the reset gear.
8. A shaft pin coupling according to claim 7, wherein, The limiting post and the pressing post are respectively provided with retaining rings at the ends near the cavity.
9. A shaft pin coupling according to claim 6, wherein, A reset spring is provided on the shaft of the reset gear.
10. A shaft pin coupling according to claim 1, wherein, It also includes a pair of positioning seats, which are respectively located at the center of the connecting seat side of the first half coupling and the second half coupling on both sides; positioning pins and positioning grooves are respectively provided on the opposite side surfaces of the positioning seats on both sides; when the first half coupling and the second half coupling on both sides are connected, the positioning pins are engaged in the positioning grooves.