A shear pin safety coupling structure and working principle for preventing overload

Abstract

The application discloses a shear pin type safety coupling structure and working principle for preventing overload and relates to the technical field of couplings. The shear pin type safety coupling structure and working principle for preventing overload comprises a driven coupling structure, the left end of the driven coupling structure is connected with a driving coupling structure, a transmission pin is arranged between the driving coupling structure and the driven coupling structure, a driven connecting body is arranged at the left end of the driven coupling structure, a driven socket is connected to the left side in the driven connecting body, the driven connecting body and the driven socket are connected through a transmission nut, a driven coupling is connected to the right side of the driven connecting body, the driven connecting body can slide left and right along the left side of the driven coupling, the sliding range of the driven connecting body and the driven coupling is limited through a sliding anti-disengagement block, and the sliding anti-disengagement block is fixed to the right end of the driven socket. The mechanism can replace pins with different diameters so as to change the size of shearing force.

Description

Technical Field

[0001] This invention relates to the field of coupling technology, specifically to a shear pin type safety coupling structure and working principle for preventing overload. Background Technology

[0002] In mechanical transmission systems, couplings, as key components connecting the driving and driven shafts, directly affect the stable operation and safety of the entire system. However, under actual working conditions, when the transmission system experiences unexpected overloads, such as equipment jamming or a sudden increase in load, traditional couplings often fail to effectively protect downstream precision components or drive motors. This can easily lead to serious malfunctions such as motor burnout, drive shaft breakage, and gearbox damage, causing not only economic losses but also potential production safety accidents. Therefore, overload protection is necessary.

[0003] For example, patent number CN 214945871 U relates to an overload-resistant safety coupling, which relates to the field of couplings. It includes a first half-coupling and a second half-coupling. The second half-coupling has a receiving groove at its end facing the first half-coupling. The first half-coupling is inserted into the receiving groove. Multiple locking blocks are arranged circumferentially along the receiving groove. The first half-coupling has a locking groove corresponding to the locking block positions. A slider is provided on the side of the locking block away from the axis of the second half-coupling. A sliding groove is provided inside the second half-coupling corresponding to the slider position. The slider slides radially within the sliding groove of the second half-coupling. The second half-coupling has an oil cavity along its axial direction. The oil cavity of the second half-coupling is connected to the sliding groove, and the end of the oil cavity away from the first half-coupling is open. A plug is threadedly connected to the opening of the oil cavity. The oil cavity is filled with hydraulic oil. The second half-coupling has a drain assembly inside the oil cavity for controlling the discharge of hydraulic oil. This application has the effect of improving the safety of coupling use.

[0004] For example, patent number CN 219954002 U discloses an environmentally friendly safety coupling with a sealing ring, including a first half-coupling and a second half-coupling, connected by a safety pin; the first and second half-couplings are axially symmetrically arranged; both the first and second half-couplings include internal teeth, with external teeth inside the internal teeth, and a sealing ring on one side of the external teeth. This invention, by providing a sealing ring between the internal and external teeth on the inner side of the safety coupling and equipping it with a sealing ring, can effectively prevent lubricants such as grease from leaking out after overload. This maintains good lubrication of the equipment, extends the service life of the lubricant, and avoids releasing the lubricant into the environment, achieving environmental protection benefits.

[0005] While both patents have certain limitations in terms of overload protection response speed and ease of structural reset, the former relies on the discharge and replenishment of hydraulic oil to achieve overload protection. The response speed of the hydraulic system is easily affected by factors such as oil temperature and viscosity, which may lead to a delay in protection action. The latter cannot replace safety pins of different thicknesses to adapt to different overload torque requirements. When it is necessary to adjust the protection threshold, the entire safety pin assembly must be replaced, which is cumbersome and lacks flexibility. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a shear pin type safety coupling structure and working principle for preventing overload, solving the problems of overload protection response speed being easily affected by environmental factors and difficulty in adjusting the overload torque threshold in the aforementioned technologies.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a shear pin type safety coupling structure and working principle for preventing overload, comprising a driven coupling structure, a driven coupling structure connected to the left end of the driven coupling structure, a transmission pin provided between the driven coupling structure and the driven coupling structure, a driven connecting body provided at the left end of the driven coupling structure, a driven socket connected to the left side inside the driven connecting body, the driven connecting body and the driven socket being connected by a transmission nut, a driven coupling connected to the right side of the driven connecting body, the driven connecting body being able to slide left and right along the left side of the driven coupling, a sliding anti-detachment block limiting the sliding range between the driven connecting body and the driven coupling, the sliding anti-detachment block being fixed to the right end of the driven socket, a dustproof sleeve provided on the outer side between the driven connecting body and the driven coupling sliding relative to each other, and a driven shaft connected to the right side of the driven coupling by a spline.

[0008] Preferably, a driven rotating fixed plate is used between the driven shaft and the driven coupling, and driven rotating limiting pins are provided on the upper and lower sides of the right side of the driven coupling, which restrict the driven rotating fixed plate to rotate only 45 degrees.

[0009] Preferably, two driven mating holes are symmetrically arranged at 45 degrees on the right side of the driven coupling, and driven fixing nuts are provided at both ends of the driven rotating fixed plate.

[0010] Preferably, the driven connector is connected to the left side of the driven connector, and the driven connector is provided with connecting rods on the front and rear sides.

[0011] Preferably, the connecting rod is fitted with a compression spring, the left end of which contacts the driving coupling, and the right end of which is connected to a spring washer. The right side of the connecting rod passes through the outside of the driven connecting body, and the right side of the spring washer contacts the driven connecting body. The connecting rod and the driven connecting body are fixed together with a nut washer and a connecting nut.

[0012] Preferably, the active coupling is connected to a drive shaft on its left side, and the active coupling and the drive shaft are connected by an active rotating fixed plate. Active rotating limit pins are provided on the upper and lower sides of the left side of the active coupling, and the active rotating limit pins restrict the active rotating fixed plate to rotate only 45 degrees.

[0013] Preferably, the active coupling has two active mating holes symmetrically arranged at 45 degrees on the left side, and the active rotating fixed plate has active fixing screws at both ends.

[0014] Preferably, the transmission pin is mainly composed of a shear pin, the middle section of which mates with the oblong hole inside the driven socket whose diameter increases from left to right, and the upper and lower sides of the shear pin mate with the oblong holes on the upper and lower sides of the right side of the driving coupling whose diameter increases from right to left. The upper and lower ends of the shear pin are fixed with pin nuts.

[0015] An overload-preventing shear pin type safety coupling structure and its working principle, including any one of the above-mentioned overload-preventing shear pin type safety coupling structures, the specific operation of which is as follows: Step S1: First, insert the drive shaft into the left side of the drive coupling, then rotate the drive rotating fixing plate 45 degrees to align the drive mating hole and the drive fixing screw. Then, use the drive fixing screw to lock the drive rotating fixing plate to complete the installation of the drive shaft and drive coupling. Step S2: Insert the driven shaft into the right side of the driven coupling. Using a similar method to the installation of the drive shaft, rotate the driven rotating fixed plate 45 degrees to align the driven mating hole with the driven fixed nut. Then, fix the driven rotating fixed plate with the driven fixed nut. The driven rotating limit pin also serves to limit the rotation angle, ensuring a stable connection between the driven shaft and the driven coupling. Step S3: Align the middle section of the shear pin of the transmission pin with the oblong hole inside the driven socket, and align the upper and lower sides of the shear pin with the oblong hole on the right side of the driving coupling. After insertion, use the pin nut to fix the upper and lower ends of the shear pin, so that the driving coupling structure and the driven coupling structure are connected by the transmission pin. At this time, the compression spring on the connecting rod is in a compressed state, and it applies a rightward elastic force to the driven connecting body through the spring washer, ensuring that the shear pin fits tightly with the oblong hole of the driven socket and the driving coupling, and avoiding loosening that would affect the transmission efficiency. Step S4: When the drive shaft transmits power, the torque is transmitted sequentially through the drive coupling, transmission pin, driven socket, and driven connector to the driven coupling, ultimately driving the driven shaft to rotate; Step S5: When the system is overloaded and the torque exceeds the shear strength of the shear pin, the shear pin breaks instantly at the mating part of the oblong hole, and the power transmission between the active coupling structure and the driven coupling structure is immediately interrupted; at this time, the elastic force of the compression spring will push the driven connecting body to slide to the left along the driven coupling, and the sliding anti-disengagement block will prevent the driven connecting body from sliding excessively and disengaging; the dust cover can effectively block external dust from entering the sliding mating surface and ensure the cleanliness of the internal structure; Step S6: After troubleshooting the overload fault, simply unscrew the pin nut, remove the broken shear pin, replace it with a new shear pin of the appropriate specification, and reinstall and fix it to restore the coupling to work. The operation is convenient and efficient. Step S7: When it is necessary to change the magnitude of the shearing force, unscrew the pin nuts at both ends of the shear pin and remove the original shear pin from the oblong hole on the right side of the driving coupling and the oblong hole inside the driven socket. Since the shearing force of the shear pin is directly related to its diameter, the larger the diameter, the higher the shearing strength and the greater the overload torque threshold it can withstand. Therefore, moving the driven connector to the right can change the size of the mating hole required for the pin.

[0016] (III) Beneficial Effects This invention provides a shear pin type safety coupling structure and working principle for preventing overload. It has the following beneficial effects: This mechanism uses shear pins as the core overload protection element. When the transmission system is overloaded, the shear pins can break instantly, quickly cutting off the power transmission between the active and driven coupling structures. This avoids the response delay problem caused by environmental factors such as oil temperature and viscosity in traditional hydraulic overload protection devices. It can achieve overload protection in milliseconds, effectively protecting the motor, drive shaft and subsequent precision components from impact damage.

[0017] By replacing the shear pins with different diameters, the overload torque threshold of the coupling can be easily adjusted. Users can select the appropriate shear pin specifications according to specific working conditions without replacing complex components, making the operation simple and flexible, and greatly improving the applicability and versatility of the coupling under different load conditions.

[0018] This device is based on an improvement of existing equipment, so the improvement cost is relatively low and it will not cause a large amount of existing equipment to be discarded. It ensures the processing effect while reducing the investment in improvement costs, making it suitable for large-scale production. Attached Figure Description

[0019] Figure 1 A schematic diagram of a shear pin type safety coupling designed to prevent overload. Figure 2 Cross-sectional view of a shear pin type safety coupling to prevent overload. Figure 3 Sectional view of the shear pin safety coupling structure to prevent overload; Figure 4 CC section view of the shear pin safety coupling structure to prevent overload; Figure 5 DD sectional view of the structure of the shear pin safety coupling to prevent overload; Figure 6 EE section view of the shear pin safety coupling structure to prevent overload; Figure 7 This is a schematic diagram of the driven socket structure; Figure 8 This is a schematic diagram of the active coupling structure.

[0020] In the diagram: 1. Driven coupling structure; 101. Driven connecting body; 102. Driven socket; 103. Transmission nut; 104. Driven coupling; 105. Dust shield; 106. Sliding anti-detachment block; 107. Driven shaft; 108. Driven rotating fixed plate; 109. Driven rotating limit pin; 110. Driven fixed nut; 111. Driven mating hole; 2. Driven coupling structure; 201. Driven coupling; 202. Connecting rod; 203. Compression spring; 204. Spring washer; 205. Nut washer; 206. Connecting nut; 207. Driven shaft; 208. Driven rotating fixed plate; 209. Driven fixing screw; 210. Driven rotating limit pin; 211. Driven mating hole; 3. Transmission pin; 31. Shear pin; 32. Pin nut. Detailed Implementation

[0021] 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. 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] Please see Figure 1-8This invention provides a technical solution: a shear pin type safety coupling structure and working principle for preventing overload, comprising a driven coupling structure 1, a driving coupling structure 2 connected to the left end of the driven coupling structure 1, a transmission pin 3 provided between the driving coupling structure 2 and the driven coupling structure 1, a driven connecting body 101 provided at the left end of the driven coupling structure 1, a driven socket 102 connected to the left side inside the driven connecting body 101, the driven connecting body 101 and the driven socket 102 connected by a transmission nut 103, a driven coupling 104 connected to the right side of the driven connecting body 101, the driven connecting body 101 being able to slide left and right along the left side of the driven coupling 104, and a connection between the driven connecting body 101 and the driven coupling 104. The sliding range is limited by a sliding anti-detachment block 106, which is fixed to the right end of the driven socket 102. A dustproof sleeve 105 is provided on the outer side between the driven connector 101 and the driven coupling 104, which slide relative to each other. A driven shaft 107 is splined to the right side of the driven coupling 104. A driven rotating fixed plate 108 is used between the driven shaft 107 and the driven coupling 104. Driven rotating limit pins 109 are provided on the upper and lower sides of the right side of the driven coupling 104, which limit the driven rotating fixed plate 108 to rotate only 45 degrees. Two driven mating holes 111 are symmetrically arranged at 45 degrees on the right side of the driven coupling 104. The driven rotating fixed plate 108 is provided at both ends. A movable fixing nut 110 is used. The driven connecting body 101 is connected to a driving coupling 201 on its left side. Connecting rods 202 are provided on both the front and rear sides of the driving coupling 201. Compression springs 203 are fitted onto the connecting rods 202. The left end of the compression spring 203 contacts the driving coupling 201, and the right end of the compression spring 203 is connected to a spring washer 204. The right side of the connecting rod 202 passes through the outside of the driven connecting body 101, and the right side of the spring washer 204 contacts the driven connecting body 101. The connecting rod 202 and the driven connecting body 101 are fixed together using a nut washer 205 and a connecting nut 206. A driving shaft 207 is connected to the left side of the driving coupling 201. The driving coupling 201 and the driving shaft 207 are connected together. The active rotating fixed plate 208 is used. The active coupling 201 has active rotating limit pins 210 on the upper and lower sides of its left side. The active rotating limit pins 210 restrict the active rotating fixed plate 208 to rotate only 45 degrees. The active coupling 201 has two active mating holes 211 symmetrically arranged at 45 degrees on its left side. The active rotating fixed plate 208 has active fixing screws 209 at both ends. The transmission pin 3 is based on a shear pin 31. The middle section of the shear pin 31 mates with the oblong hole with an enlarging diameter from left to right inside the driven socket 102. The upper and lower sides of the shear pin 31 mate with the oblong holes with an enlarging diameter from right to left on the upper and lower sides of the right side of the active coupling 201. The upper and lower ends of the shear pin 31 are fixed with pin nuts 32.

[0023] An overload-preventing shear pin type safety coupling structure and its working principle, including any one of the above-mentioned overload-preventing shear pin type safety coupling structures, the specific operation of which is as follows: Step S1: First, insert the drive shaft 207 into the left side of the drive coupling 201, then rotate the drive rotating fixing plate 208 by 45 degrees to align the drive mating hole 211 and the drive fixing screw 209. Then, use the drive fixing screw 209 to lock the drive rotating fixing plate 208, thus completing the installation of the drive shaft 207 and the drive coupling 201.

[0024] Step S2: Insert the driven shaft 107 into the right side of the driven coupling 104, using a similar method to the installation of the drive shaft 207. Rotate the driven rotating fixed plate 108 by 45 degrees to align the driven mating hole 111 with the driven fixed nut 110. Then, fix the driven rotating fixed plate 108 with the driven fixed nut 110. The driven rotating limit pin 109 also serves to limit the rotation angle, ensuring a stable connection between the driven shaft 107 and the driven coupling 104.

[0025] Step S3: Align the middle section of the shear pin 31 of the transmission pin 3 with the oblong hole inside the driven socket 102, and align the upper and lower sides of the shear pin 31 with the oblong hole on the right side of the driving coupling 201. After insertion, fix the shear pin 31 at both ends with the pin nut 32, so that the driving coupling structure 2 and the driven coupling structure 1 are connected by the transmission pin 3. At this time, the compression spring 203 on the connecting rod 202 is in a compressed state, and it applies a rightward elastic force to the driven connecting body 101 through the spring washer 204, ensuring that the shear pin 31 fits tightly with the oblong hole of the driven socket 102 and the driving coupling 201, and avoiding loosening that would affect the transmission efficiency.

[0026] Step S4: When the drive shaft 207 transmits power, the torque is transmitted sequentially through the drive coupling 201, the transmission pin 3, the driven socket 102, and the driven connector 101 to the driven coupling 104, which ultimately drives the driven shaft 107 to rotate.

[0027] Step S5: When the system is overloaded and the torque exceeds the shear strength of the shear pin 31, the shear pin 31 breaks instantly at the mating part of the oblong hole, and the power transmission between the active coupling structure 2 and the driven coupling structure 1 is immediately interrupted. At this time, the elastic force of the compression spring 203 will push the driven connector 101 to slide to the left along the driven coupling 104, and the sliding anti-detachment block 106 will prevent the driven connector 101 from sliding excessively and detaching; the dust shield 105 can effectively block external dust from entering the sliding mating surface and ensure the cleanliness of the internal structure.

[0028] Step S6: After troubleshooting the overload fault, simply unscrew the pin nut 32, remove the broken shear pin 31, replace it with a new shear pin of the appropriate specification, and reinstall and fix it to restore the coupling to work. The operation is convenient and efficient.

[0029] Step S7: When it is necessary to change the magnitude of the shearing force, unscrew the pin nuts 32 at both ends of the shear pin 31, and remove the original shear pin 31 from the oblong hole on the right side of the driving coupling 201 and the oblong hole inside the driven socket 102. Since the shearing force of the shear pin 31 is directly related to its diameter, the larger the diameter, the higher the shearing strength, and the greater the overload torque threshold it can withstand. Therefore, moving the driven connector 101 to the right can change the size of the mating hole required for the pin 31.

[0030] In summary, this mechanism uses a shear pin as the core overload protection element. When the transmission system is overloaded, the shear pin can break instantly, quickly cutting off the power transmission between the active and driven coupling structures. This avoids the response delay problem caused by environmental factors such as oil temperature and viscosity in traditional hydraulic overload protection devices, and can achieve overload protection within milliseconds, effectively protecting the motor, drive shaft, and subsequent precision components from impact damage.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shear pin type safety coupling structure for preventing overload, comprising a driven coupling structure (1), wherein the left end of the driven coupling structure (1) is connected to a driving coupling structure (2), and a transmission pin (3) is provided between the driving coupling structure (2) and the driven coupling structure (1), characterized in that: The driven coupling structure (1) has a driven connector (101) at its left end. A driven socket (102) is connected to the left side of the driven connector (101). The driven connector (101) and the driven socket (102) are connected by a transmission nut (103). A driven coupling (104) is connected to the right side of the driven connector (101). The driven connector (101) can slide left and right along the left side of the driven coupling (104). The sliding range between the driven connector (101) and the driven coupling (104) is limited by a sliding anti-detachment block (106). The sliding anti-detachment block (106) is fixed to the right end of the driven socket (102). A dustproof sleeve (105) is provided on the outer side between the driven connector (101) and the driven coupling (104) sliding against each other. A driven shaft (107) is connected to the right side of the driven coupling (104) by a spline.

2. The overload-prevention shear pin type safety coupling structure according to claim 1 is characterized in that: A driven rotating fixed plate (108) is used between the driven shaft (107) and the driven coupling (104). A driven rotating limit pin (109) is provided on the upper and lower sides of the right side of the driven coupling (104). The driven rotating limit pin (109) restricts the driven rotating fixed plate (108) to rotate only 45 degrees.

3. The overload-prevention shear pin type safety coupling structure according to claim 1 is characterized in that: The driven coupling (104) has two driven mating holes (111) symmetrically arranged at 45 degrees on the right side, and the driven rotating fixed plate (108) has driven fixing nuts (110) at both ends.

4. The overload-prevention shear pin type safety coupling structure according to claim 1 is characterized in that: The driven connector (101) is connected to the left side of the drive coupling (201), and the drive coupling (201) is provided with connecting rods (202) on the front and rear sides.

5. The overload-prevention shear pin type safety coupling structure according to claim 4 is characterized in that: The connecting rod (202) is fitted with a compression spring (203). The left end of the compression spring (203) is in contact with the driving coupling (201). The right end of the compression spring (203) is connected to a spring washer (204). The right side of the connecting rod (202) passes through the outside of the driven connector (101). The right side of the spring washer (204) is in contact with the driven connector (101). The connecting rod (202) and the driven connector (101) are fixed together with a nut washer (205) and a connecting nut (206).

6. The overload-prevention shear pin type safety coupling structure according to claim 4 is characterized in that: The active coupling (201) is connected to the active shaft (207) on the left side. The active coupling (201) and the active shaft (207) are connected by an active rotating fixed disk (208). The active coupling (201) is provided with active rotating limit pins (210) on the upper and lower sides of the left side. The active rotating limit pins (210) restrict the active rotating fixed disk (208) to rotate only 45 degrees.

7. The overload-prevention shear pin type safety coupling structure according to claim 4 is characterized in that: The active coupling (201) has two active mating holes (211) symmetrically arranged at 45 degrees on the left side, and the active rotating fixed plate (208) has active fixing screws (209) at both ends.

8. The overload-prevention shear pin type safety coupling structure according to claim 1 is characterized in that: The transmission pin (3) is based on a shear pin (31). The middle section of the shear pin (31) is engaged with the oblong hole inside the driven socket (102) whose diameter increases from left to right. The upper and lower sides of the shear pin (31) are engaged with the oblong holes on the upper and lower sides of the right side of the drive coupling (201) whose diameter increases from right to left. The upper and lower ends of the shear pin (31) are fixed with pin nuts (32).

9. The working principle of a shear pin type safety coupling structure for preventing overload, characterized in that: The overload-prevention shear pin type safety coupling structure, including any one of claims 1-8, operates as follows: Step S1: First, insert the drive shaft (207) into the left side of the drive coupling (201), then rotate the drive rotating fixed plate (208) 45 degrees to align the drive mating hole (211) and the drive fixing screw (209), and then use the drive fixing screw (209) to lock the drive rotating fixed plate (208) to complete the installation of the drive shaft (207) and the drive coupling (201); Step S2: Insert the driven shaft (107) into the right side of the driven coupling (104). Using a similar method to the installation of the drive shaft (207), rotate the driven rotating fixed plate (108) 45 degrees so that the driven mating hole (111) is aligned with the driven fixed nut (110). Then, fix the driven rotating fixed plate (108) with the driven fixed nut (110). The driven rotating limit pin (109) also serves to limit the rotation angle, ensuring that the driven shaft (107) and the driven coupling (104) are firmly connected. Step S3: Align the middle section of the shear pin (31) of the transmission pin (3) with the oblong hole inside the driven socket (102), and align the upper and lower sides of the shear pin (31) with the oblong hole on the right side of the drive coupling (201). After insertion, use the pin nut (32) to fix the shear pin (31) at both ends, so that the drive coupling structure (2) and the driven coupling structure (1) are connected by the transmission pin (3). At this time, the compression spring (203) on the connecting rod (202) is in a compressed state, and it applies a rightward elastic force to the driven connecting body (101) through the spring washer (204) to ensure that the shear pin (31) fits tightly with the oblong hole of the driven socket (102) and the drive coupling (201) to avoid loosening and affecting the transmission efficiency. Step S4: When the drive shaft (207) transmits power, the torque is transmitted sequentially through the drive coupling (201), transmission pin (3), driven socket (102), and driven connector (101) to the driven coupling (104), which ultimately drives the driven shaft (107) to rotate; Step S5: When the system is overloaded and the torque exceeds the shear strength of the shear pin (31), the shear pin (31) breaks instantly at the mating part of the waist-shaped hole, and the power transmission between the active coupling structure (2) and the driven coupling structure (1) is immediately interrupted; at this time, the elastic force of the compression spring (203) will push the driven connector (101) to slide to the left along the driven coupling (104), and the sliding anti-detachment block (106) will prevent the driven connector (101) from sliding excessively and detaching; the dust shield (105) can effectively block external dust from entering the sliding mating surface and ensure the cleanliness of the internal structure; Step S6: After the overload fault is eliminated, simply unscrew the pin nut (32), remove the broken shear pin (31), replace it with a new shear pin of the appropriate specification (31), and reinstall and fix it to restore the coupling to work. The operation is convenient and efficient. Step S7: When it is necessary to change the magnitude of the shearing force, unscrew the pin nuts (32) at both ends of the shear pin (31) and remove the original shear pin (31) from the waist-shaped hole on the right side of the drive coupling (201) and the waist-shaped hole inside the driven socket (102); since the shearing force of the shear pin (31) is directly related to its diameter, the larger the diameter, the higher the shearing strength, and the greater the overload torque threshold that it can withstand; therefore, moving the driven connector (101) to the right can change the size of the mating hole required for the pin (31).

Images