Shear pin type safety clutch for motor

Abstract

The invention discloses a shear pin type safety clutch for a motor, relates to the technical field of motor clutches, and aims to solve the problems that in the background technology, when the torque borne by the motor exceeds a certain safety limit value, the motor cannot be quickly and reliably disconnected from a load, harmful effects are easily generated on the motor, even the motor is burnt out, and the safety is low. According to the scheme, the coupling comprises a motor end coupling body and a load end coupling body, the motor end coupling body comprises a first connecting plate and a first connecting cylinder fixedly arranged on the outer wall of one side of the first connecting plate, and the load end coupling body comprises a second connecting plate and a second connecting cylinder fixedly arranged on the outer wall of one side of the second connecting plate; a sliding way is formed in the inner wall of the second connecting cylinder, four mounting holes are formed in the outer wall of one side of the second connecting plate, and connecting mechanisms are arranged in the four mounting holes. When the torque borne by the motor exceeds the safety limit value, the motor and the load can be disconnected in time, the motor is prevented from being damaged, and safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of motor clutches, and in particular to a shear pin type safety clutch for a motor. Background Art

[0002] An electric motor (commonly known as a "motor") is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. A coupling is a device that connects two shafts or a shaft and a rotating part, rotates together in the process of transmitting motion and power, and does not disengage under normal circumstances. It is sometimes also used as a safety device to prevent the connected parts from being subjected to excessive loads and play a role in overload protection. It is used to firmly connect the driving shaft and the driven shaft in different mechanisms to rotate together and transmit motion and torque. Mechanical parts. Sometimes it is also used to connect shafts with other parts (such as gears, pulleys, etc.), often composed of two halves, connected by keys or tight fits, fastened to the two shaft ends, and then connected in some way. The coupling can also compensate for the offset (including axial offset, radial offset, angular offset or combined offset) between the two shafts due to inaccurate manufacturing and installation, deformation or thermal expansion during operation, etc., as well as mitigate impact and absorb vibration.

[0003] When the motor is running under normal conditions, the coupling is required to ensure the effective transmission of torque. Traditional connection methods such as bolts and pins can ensure the effective transmission of torque under normal conditions. However, when the torque borne by the motor exceeds a certain safety limit, it is impossible to quickly and reliably disconnect from the load, which can easily have a harmful effect on the motor and even cause the motor to burn out, resulting in low safety. Summary of the invention

[0004] The present invention provides a shear pin type safety clutch for a motor, which solves the problem in the prior art that when the torque borne by the motor exceeds a certain safety limit, the motor cannot be quickly and reliably disconnected from the load, which is likely to have a harmful effect on the motor and even cause the motor to burn out, resulting in low safety.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A shear pin type safety clutch for a motor comprises a motor end coupling and a load end coupling, the motor end coupling comprises a first connecting plate and a first connecting tube fixedly arranged on an outer wall of one side of the first connecting plate, the load end coupling comprises a second connecting plate and a second connecting tube fixedly arranged on an outer wall of one side of the second connecting plate, a slideway is provided on the inner wall of the second connecting tube, four mounting holes are provided on the outer wall of one side of the second connecting plate, and a connecting mechanism is provided in each of the four mounting holes, the connecting mechanism comprises a safety pin with a twist-off groove on the outer wall of one end, a first pin sleeve plugged into the outer wall of one end of the safety pin, and a second pin sleeve plugged into the outer wall of one end of the safety pin, four mounting grooves are provided on the outer wall of one side of the second connecting plate, and an ejection mechanism is provided in each of the four mounting grooves, the ejection mechanism comprises an ejection spring sleeved in the mounting groove and a gasket abutting against the outer wall of one side of the first connecting plate.

[0007] Preferably, a slot is formed on the inner wall of the first connecting tube, and a threaded hole is formed on the outer wall of one end of the first connecting tube.

[0008] Preferably, the outer walls at one end of the first connecting tube and the second connecting tube are provided with air inlets distributed at equal distances, and the inner walls in the middle of one side of the first connecting tube and the second connecting tube are provided with ventilation openings, the outer walls on the opposite side of the first connecting tube and the second connecting tube are provided with grooves, and the inner walls on one side of the two grooves are provided with air outlets distributed at equal distances.

[0009] Through the above scheme, the key in the keyway of the motor output shaft is connected through the card slot, and then the first connecting tube and the motor output shaft are fixed by bolts. The key sliding sleeve in the keyway on the load-end main shaft is set in the slideway. When the motor-end coupling and the load-end coupling are combined into a complete coupling and rotated, the heat generated inside the coupling is discharged from the air outlet.

[0010] Preferably, one end of the safety pin is provided with an external thread, and one end of the safety pin is screwed onto the inner wall of one end of the mounting hole, and the first pin sleeve is inserted into the mounting hole.

[0011] Preferably, four fixing holes are opened on the outer wall of one side of the first connecting plate, and the four second pin sleeves are respectively inserted into the four fixing holes.

[0012] Through the above scheme, when the load on the load-end spindle is large and the torque borne by the motor exceeds the safety limit, the torsion groove with a certain bevel on the safety pin will break. The first pin sleeve and the second pin sleeve prevent the safety pin from damaging the external connection device during the shearing process. At the same time, the safety pin can be reliably disconnected when the shearing stress is reached, avoiding the safety pin from sticking and incomplete cutting during the cutting process.

[0013] Preferably, the outer wall at one end of the ejection spring is a planar structure, and a gasket is fixed on the outer wall at one end of the ejection spring, and the gasket is slidably sleeved in the installation groove.

[0014] Through the above scheme, when the safety pin breaks, the motor-end coupling and the load-end coupling lose connection, and the ejection spring is reset at this time, and the load-end coupling is ejected under the action of the ejection spring tension, so that the load-end coupling moves along the load-end main shaft, so that the load-end coupling and the motor-end coupling are completely separated, preventing the broken part of the safety pin from scratching the first connecting plate and the second connecting plate.

[0015] The beneficial effects of the present invention are:

[0016] When the load on the load-end spindle is large and the torque borne by the motor exceeds the safety limit, the torsion groove with a certain bevel on the safety pin will break, and the first pin sleeve and the second pin sleeve prevent the safety pin from damaging the external connection device during the shearing process. At the same time, the safety pin is reliably disconnected when the shearing stress is reached, avoiding the adhesion and insufficient cutting of the safety pin during the cutting process. When the safety pin breaks, the motor-end coupling and the load-end coupling lose connection. At this time, the ejection spring resets, and the load-end coupling is ejected under the action of the ejection spring tension, so that the load-end coupling moves along the load-end spindle, so that the load-end coupling and the motor-end coupling are completely separated, preventing the safety pin from scratching the first connecting plate and the second connecting plate at the broken part. When the torque borne by the motor exceeds the safety limit, the motor and the load can be disconnected in time to prevent damage to the motor, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the overall front view structure of a shear pin type safety clutch for a motor.

[0018] Figure 2 The present invention is a schematic diagram of the overall cross-sectional structure of a shear pin type safety clutch for a motor.

[0019] Figure 3 The present invention provides a schematic cross-sectional structure diagram of a motor-end coupling of a shear pin type safety clutch for a motor.

[0020] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of a load-end coupling of a shear pin type safety clutch for a motor.

[0021] Figure 5 The present invention is a schematic cross-sectional structure diagram of a connection mechanism of a shear pin type safety clutch for a motor.

[0022] Figure 6 An exploded diagram of a connection mechanism of a shear pin type safety clutch for a motor proposed by the present invention.

[0023] Figure 7The present invention is a schematic diagram of the front structural view of an ejection mechanism of a shear pin type safety clutch for a motor.

[0024] In the figure: 1. motor end coupling; 101. first connecting plate; 102. first connecting cylinder; 103. limiting ring; 104. slot; 105. threaded hole; 2. load end coupling; 201. second connecting plate; 202. second connecting cylinder; 21. slideway; 3. air inlet; 4. vent; 5. groove; 6. air outlet; 7. mounting hole; 8. connecting mechanism; 801. safety pin; 802. first pin sleeve; 803. second pin sleeve; 9. fixing hole; 10. mounting slot; 11. ejection mechanism; 111. ejection spring; 112. gasket. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1, reference Figure 1-4 A shear pin type safety clutch for a motor comprises a motor end coupling 1 and a load end coupling 2, wherein the motor end coupling 1 comprises a first connecting plate 101 and a first connecting tube 102 fixedly arranged on an outer wall of one side of the first connecting plate 101, a card groove 104 is formed on the inner wall of the first connecting tube 102, and a threaded hole 105 is formed on the outer wall of one end of the first connecting tube 102, and the load end coupling 2 comprises a second connecting plate 201 and a second connecting tube 202 fixedly arranged on an outer wall of one side of the second connecting plate 201, a slideway 21 is formed on the inner wall of the second connecting tube 202, air inlets 3 distributed at equal distances are formed on the outer walls of one end of the first connecting tube 102 and the second connecting tube 202, vents 4 are formed on the inner walls of the middle part of one side of the first connecting tube 102 and the second connecting tube 202, grooves 5 are formed on the outer walls on the opposite sides of the first connecting tube 102 and the second connecting tube 202, and air outlets 6 distributed at equal distances are formed on the inner walls of one side of the two grooves 5.

[0027] Example 2, reference Figure 1-6 A shear pin type safety clutch for a motor also includes four mounting holes 7 on the outer wall of one side of a second connecting plate 201, and a connecting mechanism 8 is provided in each of the four mounting holes 7. The connecting mechanism 8 includes a safety pin 801 with a twist-off groove on the outer wall at one end, a first pin sleeve 802 plugged into the outer wall of one end of the safety pin 801, and a second pin sleeve 803 plugged into the outer wall of one end of the safety pin 801. An external thread is provided at one end of the safety pin 801, and one end of the safety pin 801 is screwed onto the inner wall of one end of the mounting hole 7. The first pin sleeve 802 is plugged into the mounting hole 7. Four fixing holes 9 are provided on the outer wall of one side of the first connecting plate 101, and the four second pin sleeves 803 are respectively plugged into the four fixing holes 9.

[0028] Example 3, reference Figure 1-7 A shear pin type safety clutch for a motor also includes four mounting grooves 10 on the outer wall of one side of a second connecting plate 201, and an ejection mechanism 11 is provided in each of the four mounting grooves 10. The ejection mechanism 11 includes an ejection spring 111 sleeved in the mounting groove 10 and a gasket 112 abutting against the outer wall of one side of the first connecting plate 101. The outer wall of one end of the ejection spring 111 is a planar structure, and the gasket 112 is fixedly arranged on the outer wall of one end of the ejection spring 111, and the gasket 112 is slidably sleeved in the mounting groove 10.

[0029] The card slot 104 is connected to the key in the keyway of the motor output shaft, and then the first connecting tube 102 and the motor output shaft are fixed by bolts. The key sliding sleeve in the keyway on the load-end main shaft is set in the slideway 21. When the motor-end coupling 1 and the load-end coupling 2 are combined into a complete coupling and rotated, the heat generated inside the coupling is discharged from the air outlet 6. When the load-end main shaft load is large and the torque borne by the motor exceeds the safety limit, the twist-off groove with a certain bevel on the safety pin 801 will break. The first pin sleeve 802 and the second pin sleeve 803 prevent the safety pin 801 from being sheared during the shearing process. The external connection device is damaged, and the safety pin 801 is reliably disconnected when the shear stress is reached, so as to avoid the safety pin 801 from sticking and insufficient cutting during the cutting process. When the safety pin 801 breaks, the motor-end coupling 1 and the load-end coupling 2 lose connection. At this time, the ejection spring 111 is reset, and the load-end coupling 2 is ejected under the action of the tension of the ejection spring 111, so that the load-end coupling 2 moves along the load-end main axis, so that the load-end coupling 2 is completely separated from the motor-end coupling 1, and the broken part of the safety pin 801 is prevented from scratching the first connecting plate 101 and the second connecting plate 201.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A shear pin type safety clutch for a motor, comprising a motor end coupling (1) and a load end coupling (2), characterized in that: The motor end coupling (1) comprises a first connecting plate (101) and a first connecting tube (102) fixedly arranged on an outer wall of one side of the first connecting plate (101); The load-end coupling (2) comprises a second connecting plate (201) and a second connecting tube (202) fixedly arranged on an outer wall of one side of the second connecting plate (201), and a slideway (21) is provided on the inner wall of the second connecting tube (202); Four mounting holes (7) are formed on the outer wall of one side of the second connecting plate (201), and a connecting mechanism (8) is provided in each of the four mounting holes (7), wherein the connecting mechanism (8) comprises a safety pin (801) with a twist-off groove formed on the outer wall at one end, a first pin sleeve (802) plugged into the outer wall at one end of the safety pin (801), and a second pin sleeve (803) plugged into the outer wall at one end of the safety pin (801); Four mounting grooves (10) are formed on an outer wall of one side of the second connecting plate (201), and each of the four mounting grooves (10) is provided with an ejection mechanism (11), wherein the ejection mechanism (11) comprises an ejection spring (111) sleeved in the mounting groove (10) and a gasket (112) abutting against an outer wall of one side of the first connecting plate (101).

2. A shear pin type safety clutch for a motor according to claim 1, characterized in that: A clamping groove (104) is provided on the inner wall of the first connecting tube (102), and a threaded hole (105) is provided on the outer wall of one end of the first connecting tube (102).

3. A shear pin type safety clutch for a motor according to claim 1, characterized in that: The outer walls of one end of the first connecting tube (102) and the second connecting tube (202) are both provided with air inlets (3) distributed at equal distances, and the inner walls of the middle of one side of the first connecting tube (102) and the second connecting tube (202) are both provided with ventilation openings (4), the outer walls of the opposite sides of the first connecting tube (102) and the second connecting tube (202) are both provided with grooves (5), and the inner walls of one side of the two grooves (5) are both provided with air outlet holes (6) distributed at equal distances.

4. A shear pin type safety clutch for a motor according to claim 1, characterized in that: One end of the safety pin (801) is provided with an external thread, and one end of the safety pin (801) is screwed onto the inner wall of one end of the mounting hole (7), and the first pin sleeve (802) is inserted into the mounting hole (7).

5. A shear pin type safety clutch for a motor according to claim 1, characterized in that: Four fixing holes (9) are opened on the outer wall of one side of the first connecting plate (101), and the four second pin sleeves (803) are respectively inserted into the four fixing holes (9).

6. A shear pin type safety clutch for a motor according to claim 1, characterized in that: The outer wall at one end of the ejection spring (111) is a planar structure, and the gasket (112) is fixedly arranged on the outer wall at one end of the ejection spring (111), and the gasket (112) is slidably sleeved in the installation groove (10).

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