A chain buckling defect detection mechanism

Abstract

The present invention provides a chain buckling detection mechanism, comprising a sprocket assembly for mounting a chain to be detected and a drive motor capable of driving the sprocket assembly to rotate. The mechanism also includes a rotating bracket, wherein the rotation axis of the rotating bracket is parallel to the rotation axis of the sprocket assembly. The rotating bracket is connected to a positioning shaft, a drive assembly, and a sensor. The drive assembly is used to drive the rotating bracket to rotate circumferentially so that the positioning shaft is pressed against the outer wall of the chain. When the buckling point of the chain passes through the positioning shaft, the positioning shaft is driven to generate position jump along the circumferential direction with the rotation axis of the rotating bracket as the center. The sensor is used to detect the jump displacement of the positioning shaft. The present invention provides a chain buckling detection mechanism that minimizes the resistance and damping in the direction of the buckling detection action, thereby ensuring the accuracy of the detection.

Description

Technical Field

[0001] The invention relates to the field of automobile engine accessories, in particular to a chain buckling defect detection mechanism. Background Art

[0002] During chain assembly, problems such as over-tightening or deformation of the chain links, or the presence of impurities between chain components can cause chain buckling, hindering the chain's flexibility and preventing it from bending properly. This phenomenon, where chain links experience difficulty turning freely, is called buckling, or is known as stiff, seizure-induced, or hinge-locked conditions. This is a quality defect in chains, requiring an effective method to detect and assess the severity of this defect.

[0003] Currently, methods for detecting chain buckling defects include manual inspection, machine vision, linear actuator testing, and torque testing. Research on automated inspection systems has only recently begun. However, these methods all have varying degrees of limitations, such as large measurement errors and poor detection of minor buckling defects.

[0004] Manual inspection: This involves manually pulling the chain suspended from the polished rod to check for buckling. This method can detect severe buckling defects, but cannot detect minor buckling defects and cannot accurately quantify the buckling.

[0005] Machine vision inspection: The degree of buckling is detected by observing the deformation of the chain during operation. This method is significantly affected by the chain's shape, such as chamfers, curves, the front and back of the chain plate, and oil stains. This can lead to large errors in the detection data, making it difficult to ensure precision and accuracy. It is also ineffective for detecting minor buckling.

[0006] Detects torque changes and separates the torque differences caused by chain buckling based on the torque of the chain's rotating shaft. Small buckling defects can result in large errors.

[0007] The linear actuator is perpendicular to the chain's rotation. The lateral force of the chain, combined with the weight of the test head and the inherent friction of the actuator, significantly reduces the flexibility of the detection mechanism. Excessive friction can significantly affect the detection of minor buckling defects. Summary of the Invention

[0008] The problem solved by the present invention is to provide a chain buckling fault detection mechanism to overcome the defects in the prior art, thereby minimizing the resistance and damping in the buckling fault detection action direction and ensuring the detection accuracy.

[0009] In order to solve the above problems, the present invention provides a chain buckling detection mechanism, comprising a sprocket assembly for installing the chain to be detected and a drive motor capable of driving the sprocket assembly to rotate, and also comprising a rotating bracket, and the direction of the rotation axis of the rotating bracket is parallel to the direction of the rotation axis of the sprocket assembly; the rotating bracket is connected to a positioning shaft, a driving assembly and a sensor, the driving assembly is used to drive the rotating bracket to rotate circumferentially so that the positioning shaft is pressed against the outer wall of the chain, and when the buckling point of the chain passes through the positioning shaft, the positioning shaft is driven to generate position jump along the circumferential direction with the rotation axis of the rotating bracket as the center, and the sensor is used to obtain the jumping displacement of the positioning shaft.

[0010] Compared with the prior art, the chain buckling detection mechanism of the present invention has the following advantages:

[0011] In the structure of the present invention, the positioning shaft used to detect chain beating is pressed against the outer wall of the chain in a rotating and tight manner. When the poorly bent point of the chain passes through the positioning shaft, the positioning shaft jumps along the circumferential rotation direction, thereby eliminating the lateral shear force caused by the direct push mechanism to the maximum extent, minimizing the resistance and damping in the direction of the poorly bent detection action, and ensuring the accuracy of the detection.

[0012] As an improvement, the rotating bracket includes a first connecting rod, a second connecting rod, and a third connecting rod, and the second connecting rod and the third connecting rod are connected to the two ends of the first connecting rod in a centrally symmetrical direction to form a right-angled S-shaped structure; the drive shaft of the drive assembly is connected to the middle of the first connecting rod, and the positioning shaft is connected to the end of the second connecting rod away from the first connecting rod. In the above-mentioned improved structure, the rotating bracket is a right-angled S-shaped structure, which has better balance, and the drive shaft is connected to the middle of the first connecting rod, and the positioning shaft is connected to the outer end of the second connecting rod. When the positioning shaft detects a poor bending point of the chain, it ensures that the right-angled S-shaped structure can rotate smoothly with the drive shaft, thereby ensuring detection accuracy.

[0013] In a further improvement, the positioning shaft is rotatably connected to the second connecting rod along its own axis, and the axis direction of the positioning shaft is parallel to the axis direction of the drive shaft. In the above improved structure, the positioning shaft is configured as a rotating shaft structure. Here, the positioning shaft is designed in the form of a rotating shaft, which minimizes the resistance caused by detection and the radius of the contact mechanism.

[0014] A further improvement is that a counterweight is provided on the third connecting rod, slidable along its axial direction. In this improved structure, the right-angled S-shaped rotating bracket combined with the counterweight design allows the positioning shaft and rotating bracket to more smoothly deflect axially when pushed by the chain's buckling point, minimizing the resistance of the detection system and the effects of excessive pressure due to gravity, thereby improving detection accuracy.

[0015] In a further improvement, a fastening bolt is connected to the third connecting rod, and the counterweight is provided with a waist-shaped hole extending along its length, and the outer end of the fastening bolt slides into the waist-shaped hole. In the above improved structure, the fastening bolt is used to guide and limit the sliding position of the counterweight.

[0016] Further improved, the driving shaft is connected to a turntable, and the rotating bracket is connected to one end of the driving shaft passing through the turntable; two baffles are also connected to the end of the turntable near the rotating bracket, and the two baffles are symmetrically arranged on both sides of the length direction of the first connecting rod, and elastic reset parts are provided between both sides of the first connecting rod and the corresponding baffles.

[0017] In a further improvement, elastic reset members are connected between the two ends of the baffles in the longitudinal direction and the first connecting rod. In the above-mentioned improved structure, when the driving assembly drives the rotating bracket to rotate and abut against the outer wall of the chain to be detected, the rotating bracket acts as a pre-tightening agent under the action of the elastic reset member at the corresponding position, that is, it has the effect of pre-pressing the outer side of the chain to ensure that the positioning shaft and the chain are in close contact; similarly, when the positioning shaft is affected by the flexion point of the chain and undergoes axial rotation fluctuations, the elastic reset member on the other side can drive the entire rotating bracket to quickly reset the positioning shaft and achieve an elastic shock-absorbing effect.

[0018] Preferably, each of the elastic reset elements comprises two springs, and both ends of the two springs are respectively abutted and limited between the corresponding baffle and the first connecting rod. In the above structure, the spring is selected as the elastic reset element, which has a simple structure and a stable elastic force.

[0019] Further improved, each of the elastic return members also includes a limiting shaft, the two ends of the limiting shaft are respectively connected to the corresponding end of the two baffles, and the two springs are respectively mounted on the outside of the two ends of the limiting shaft; both ends of the first connecting rod are provided with avoidance holes extending along its length direction, and each of the limiting shafts is movably inserted into the corresponding avoidance hole.

[0020] In a further improvement, the sensor is disposed at the outer end of the third connecting rod and close to one side of the first connecting rod. In the above improved structure, the position of the sensor is symmetrical with the center of the positioning axis. That is, when the positioning axis deviates and fluctuates, the sensor can more easily obtain an accurate runout value, thereby ensuring detection accuracy.

[0021] Description of the attached figure

[0022] Figure 1 This is a front view of the first embodiment of the chain buckling defect detection mechanism of the present invention.

[0023] Figure 21 is a top view of the first embodiment of the chain buckling detection mechanism of the present invention.

[0024] Figure 3 This is a structural diagram of the detection part in Example 1 of the chain buckling defect detection mechanism of the present invention.

[0025] Figure 4 This is a structural diagram of the detection part in the second embodiment of the chain buckling defect detection mechanism of the present invention.

[0026] Description of reference numerals:

[0027] 1. Chain; 2. Sprocket assembly; 2.1. Driving wheel; 2.2. Driven wheel; 3. Driving motor; 4. Rotating bracket; 4.1. First connecting rod; 4.1.1. Avoidance hole; 4.2. Second connecting rod; 4.3. Third connecting rod; 5. Positioning shaft; 6. Sensor; 7. Driving shaft; 8. Counterweight; 8.1. Waist-shaped hole; 9. Fastening bolt; 10. Turntable; 11. Baffle; 12. Elastic reset part; 12.1. Spring; 12.1.1. Detection spring; 12.1.2. Reset spring; 12.2. Limiting shaft; 13. Rotating cylinder; 14. Extension block. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1:

[0030] like Figure 1 、 2 As shown in Figure 3, the present invention provides a chain buckling detection mechanism, including a sprocket assembly 2 for installing a chain 1 to be detected and a drive motor 3 capable of driving the sprocket assembly 2 to rotate. Specifically, the sprocket assembly 2 includes a driving wheel 2.1 and a driven wheel 2.2. The output shaft of the drive motor 3 is connected to the driving wheel 2.1 through a coupling. The driving wheel 2.1 is assembled and driven with the chain 1 to be detected and the driven wheel 2.2 to form a power and transmission system. Before testing the chain 1, the transmission system must ensure that the chain 1 rotates at a constant speed.

[0031] In addition, such as Figure 1As shown, a rotating bracket 4 that can rotate along its own axis is also provided on one side of the sprocket assembly 2 near the driving wheel 2.1, and the direction of the rotating axis of the rotating bracket 4 is parallel to the direction of the rotating axis of the sprocket assembly 2; more specifically, the rotating bracket 4 is connected to a positioning shaft 5, a driving assembly and a sensor 6. When the chain 1 to be detected is mounted on the sprocket assembly 2, the driving assembly is used to drive the rotating bracket 4 to rotate circumferentially so that the positioning shaft 5 is pressed against the outer wall of the chain 1 at the corresponding position. After such an arrangement, during the operation of the chain assembly 1, when the running trajectory of the chain 1 fluctuates in the radial direction, the positioning shaft 5 will jump, that is, when the poor bending point of the chain 1 passes through the positioning shaft 5, the positioning shaft 5 will produce position jump along the circumferential direction with the rotation axis of the rotating bracket 4 as the center, and the specific jumping displacement can be obtained by the sensor 6. Further, the displacement information detected by the sensor 6 can be transmitted to the corresponding main controller, so that the poor bending point and the degree of bending of the chain 1 can be accurately obtained. In this structure, due to the circumferential position deviation of the positioning shaft 5 caused by the poor bending point of the chain 1, this embodiment adopts a method of pressing the chain 1 in the rotation direction to minimize the resistance to the operation of the chain 1 and prevent the occurrence of abnormal jumping. The jumping of the positioning shaft 5 is along the tangential direction of the movement of the chain 1, which effectively improves the detection accuracy and sensitivity compared with the conventional direct-acting push rod detection method.

[0032] See also Figure 1 、 3 The rotating bracket 4 in this embodiment is a right-angled S-shaped structure, specifically comprising a first connecting rod 4.1, a second connecting rod 4.2, and a third connecting rod 4.3. The second connecting rod 4.2 and the third connecting rod 4.3 are connected to the ends of the first connecting rod 4.1 in a centrally symmetrical direction, thereby forming a right-angled S-shaped structure as shown in the figure. The second connecting rod 4.2 and the third connecting rod 4.3 have identical structures and weights, thereby ensuring that the geometric center of gravity of the entire right-angled S-shaped structure can be quickly found. Furthermore, the drive shaft 7 of the drive assembly in the above structure is connected to the middle of the first connecting rod 4.1 to ensure that the right-angled S-shaped structure can rotate smoothly with the drive shaft 7; and the positioning shaft 5 is connected to the end of the second connecting rod 4.2 away from the first connecting rod 4.1. With this arrangement, when the chain 1 under inspection has a poor bending point, the positioning shaft 5 can more smoothly and accurately produce a corresponding rotational offset, thereby ensuring that even slight poor bending of the chain 1 can be accurately detected and reflected, thereby improving detection accuracy. In this embodiment, the sensor 6 is arranged at the outer end of the third connecting rod 4.3 and close to the side of the first connecting rod 4.1. Figure 1 In this structure, when the positioning shaft 5 moves, the outer end of the third connecting rod 4.3 and the position symmetrical to the center of the positioning shaft 5 change accordingly under the action of the integral rotating bracket 4, and the position is detected by the sensor 6.

[0033] In the above structure, refer to Figure 3 A counterweight 8 is provided on the third connecting rod 4.3, slidably along its axial direction. The right-angled S-shaped structure of the rotating bracket 4, combined with the counterweight 8, allows the positioning shaft 5 and the rotating bracket 4 to undergo more stable axial deflection when pushed by the buckling point of the chain 1. This minimizes the resistance of the detection system and the influence of excessive clamping force caused by the system's gravity, thereby improving detection accuracy. In this structure, a fastening bolt 9 is connected to the third connecting rod 4.3, and the counterweight 8 is provided with a waist-shaped hole 8.1 extending along its length. The outer end of the fastening bolt 9 slides into the waist-shaped hole 8.1. That is, during the rotation of the rotating bracket 4, the counterweight 8 will undergo corresponding position changes due to self-balancing, ensuring the balanced rotation of the entire rotating bracket 4. The deflected position is accurately detected by the sensor 6. Furthermore, the position of the sensor 6 in this structure is set so that the data detected by the sensor 6 is in the same direction as the direction of the chain 1 buckling detection, making the program algorithm more convenient and the detection accuracy higher.

[0034] Furthermore, in this embodiment, the positioning shaft 5 is rotatably connected to the second connecting rod 4.2 along its own axis, and the axial direction of the positioning shaft 5 is parallel to the axial direction of the drive shaft 7. The positioning shaft 5 is designed in the form of a rotating shaft, which minimizes the resistance caused by detection and the radius of the contact mechanism.

[0035] Reference Figure 2 、 3 A circular turntable 10 is also connected to the outer end of the drive shaft 7, and the rotating bracket 4 is connected to one end of the drive shaft 7 that passes through the turntable 10; accordingly, two baffles 11 are also connected to the end of the turntable 10 near the rotating bracket 4. The two baffles 11 are symmetrically arranged on both sides of the length direction of the first connecting rod 4.1, and elastic reset members 12 are arranged between the two sides of the first connecting rod 4.1 and the corresponding baffles 11. After such arrangement, when the driving assembly drives the rotating bracket 4 to rotate and rest against the outer wall of the chain 1 to be detected, the rotating bracket 4 plays a pre-tightening role under the left and right elastic reset members 12 of the corresponding positions, that is, it has the effect of pre-pressing the outer side of the chain 1 to ensure that the positioning shaft 5 and the chain 1 are tightly fitted; similarly, when the positioning shaft 5 is affected by the flexion point of the chain 1 and undergoes axial rotation fluctuations, the elastic reset member 12 on the other side can drive the entire rotating bracket 4 to quickly reset the positioning shaft 5.

[0036] More specifically, in order to make the circumferential rotation and reset movement of the rotating bracket 4 more stable and accurate, in this embodiment, elastic reset members 12 are connected between the two ends of the two baffles 11 in the length direction and the first connecting rod 4.1. Figure 3As shown, each elastic return member 12 includes two springs 12.1, and the two ends of the two springs 12.1 are respectively abutted and limited between the corresponding baffle 11 and the first connecting rod 4.1. In addition, to ensure the stable expansion and contraction of the springs 12.1 and prevent them from deflecting, each elastic return member 12 in the above structure also includes a limiting shaft 12.2, the two ends of which are respectively connected to the corresponding ends of the two baffles 11, and the two springs 12.1 are respectively sleeved on the outside of the two ends of the limiting shaft 12.2; both ends of the first connecting rod 4.1 are provided with a avoidance hole 4.1.1 extending along its length, and each limiting shaft 12.2 is movably installed in the corresponding avoidance hole 4.1.1. In this structure, the specific avoidance hole 4.1.1 also has a waist-shaped structure. When the rotating bracket 4 rotates, the two limiting shafts 12.2 move in the corresponding avoidance hole 4.1.1.

[0037] In this embodiment, the drive assembly includes a rotary cylinder 13, which is connected to a turntable 10 via a drive shaft 7. Two baffles 11 are fixed to the turntable 10. The two baffles 11 are used to connect and position corresponding limit shafts 12.2. In addition, to ensure that the turntable 10 and the baffles 11 move synchronously with the rotary cylinder 13, the rotary bracket 4 is rotatably connected to the drive shaft 7 via a bearing, and the rotary structure in this embodiment specifically includes four springs 12.1, such as Figure 3 As shown, the four springs include two obliquely symmetrical detection springs 12.1.1 and two obliquely symmetrical return springs 12.1.2. Under the rotational thrust from different directions of the detection springs 12.2.1 and return springs 12.1.2, the rotating bracket 4 can rotate freely in both the detection and return directions, and can rotate relatively freely within the limited space relative to the turntable 10 and baffle 11. On the one hand, the detection springs 12.1.1 set provide a preload for detection; on the other hand, the return springs 12.1.2 set provide shock absorption during the return movement of the rotating mechanism.

[0038] Before testing, the rotating cylinder 13 drives the integrated turntable 10 and baffle 11. The thrust of baffle 11's rotation is transmitted to the rotating bracket 4 via the return spring 12.1.2, causing the positioning shaft 5 to leave the chain area. At this point, the chain 1 can be removed from the device or a new chain 1 can be hung for measurement. After the device is started, the same mechanism operates in reverse. The rotational force passes through the test spring 12.1.1, eventually forcing the positioning shaft 5 to press against the outside of the tensioned chain 1. The chain 1 then begins to rotate again, and the chain 1 buckling test begins.

[0039] After the detection process is initiated, chain 1 is tensioned by driven pulley 2.2, driving pulley 2.1 begins to rotate clockwise, and chain 1 begins to rotate at the linear velocity of driving pulley 2.1. Simultaneously, rotating cylinder 13 swings, driving turntable 10 and baffle 11, pushing detection spring 12.1.1 to rotate. Rotating bracket 4, under the force of detection spring 12.1.1, rotates, causing positioning shaft 5 to press against the right side of chain 1. When the buckling point passes driving pulley 2.1, it deforms radially along driving pulley 2.1 under the influence of the tension of driven pulley 2.2. When this point rotates to the position of positioning shaft 5, due to the influence of the buckling problem, the rigid deformation cannot be restored or the restoration is delayed, causing positioning shaft 5 to run out. This runout is transmitted through rotating bracket 4 (S-shaped cantilever) to the other end of the bracket. Sensor 6, located on the side of third link 4.3 at the other end of rotating bracket 4, records the runout displacement. The corresponding main controller calculates the effective runout range and determines the degree of buckling according to the corresponding standard. When the chain 1 is only slightly buckled, the buckled link at the detection site will experience some hysteresis during the reset process, but the buckling defect can still be detected to a certain extent. Furthermore, the sliding counterweight 8 in this embodiment can better ensure the balance of the rotating bracket 4 and ensure that the measurement system selects the minimum strength of the detection spring 12.1.1.

[0040] The lightweight design of the detection system, comprised of the rotating bracket 4 and the pivoting positioning shaft 5 of the right-angled S-shaped mechanism in this embodiment, ensures the highest sensitivity and can detect even the slightest buckling failure. Furthermore, the detection mechanism's rotating abutment minimizes the lateral shear forces created by the direct-push mechanism, effectively eliminating resistance and damping in the direction of buckling detection, ensuring detection accuracy. Sensor 6 utilizes a high-speed, high-precision, non-contact displacement sensor to ensure the highest possible accuracy and stability.

[0041] On the other hand, the design of the entire mechanism in this embodiment has almost no impact on the operation of the chain 1, ensuring that other measurements can be performed on the equipment at the same time, such as center distance, fluctuation, machine vision inspection of chain pieces, etc.

[0042] Example 2:

[0043] The structure of this embodiment is basically the same as that of the first embodiment. The only difference is that the sensor 6 is arranged at one end of the first connecting rod 4.1 close to the second connecting rod 4.2. Specifically, a rectangular extension block 14 is provided at one end of the first connecting rod 4.1 close to the second connecting rod 4.2. The extension block 14 is consistent with the extension direction of the positioning shaft 5, and the sensor 6 is arranged on the side of the extension block 14 close to the second connecting rod 4.2. Figure 4 shown.

[0044] Example 3:

[0045] The structure of this embodiment is basically the same as that of the first embodiment, with the only difference being that the positioning shaft 5 is replaced with a gear structure, thereby enabling detection of buckling defects in the roller chain.

[0046] Example 4:

[0047] The structure of this embodiment is basically the same as that of the first embodiment. The only difference is that the positioning shaft 5 is replaced with a pressure wheel according to the contour of the back of the belt, so that the bulge on the back of the belt can be detected.

[0048] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A chain buckling fault detection mechanism, comprising a sprocket assembly (2) for mounting a chain (1) to be detected and a drive motor (3) capable of driving the sprocket assembly (2) to rotate, characterized in that: The invention also includes a rotating bracket (4), and the direction of the rotating axis of the rotating bracket (4) is parallel to the direction of the rotating axis of the sprocket assembly (2); the rotating bracket (4) is connected to a positioning shaft (5), a driving assembly and a sensor (6); the driving assembly is used to drive the rotating bracket (4) to rotate circumferentially so that the positioning shaft (5) is pressed against the outer wall of the chain (1); when the bending defect point of the chain (1) passes through the positioning shaft (5), the positioning shaft (5) is driven to generate position jump along the circumferential direction with the rotating axis of the rotating bracket (4) as the center, and the sensor (6) is used to obtain the jumping displacement of the positioning shaft (5); The rotating bracket (4) comprises a first connecting rod (4.1), a second connecting rod (4.2) and a third connecting rod (4.3), and the second connecting rod (4.2) and the third connecting rod (4.3) are connected to both ends of the first connecting rod (4.1) in a centrally symmetrical direction to form a right-angled S-shaped structure; the driving shaft (7) of the driving assembly is connected to the middle of the first connecting rod (4.1), and the positioning shaft (5) is connected to the end of the second connecting rod (4.2) away from the first connecting rod (4.1); The driving shaft (7) is connected to a turntable (10), and the rotating bracket (4) is connected to one end of the driving shaft (7) passing through the turntable (10); two baffles (11) are also connected to one end of the turntable (10) near the rotating bracket (4), and the two baffles (11) are symmetrically arranged on both sides of the length direction of the first connecting rod (4.1), and elastic reset parts (12) are arranged between the two sides of the first connecting rod (4.1) and the corresponding baffles (11).

2. The chain buckling fault detection mechanism according to claim 1, characterized in that: The positioning shaft (5) is rotatably connected to the second connecting rod (4.2) along its own axis, and the axial direction of the positioning shaft (5) is parallel to the axial direction of the driving shaft (7).

3. The chain buckling defect detection mechanism according to claim 1 or 2, characterized in that: A counterweight block (8) is provided on the third connecting rod (4.3) so as to be slidable along its axial direction.

4. The chain buckling fault detection mechanism according to claim 3, characterized in that: The third connecting rod (4.3) is connected with a fastening bolt (9), and the counterweight (8) is provided with a waist-shaped hole (8.1) extending along its length direction, and the outer end of the fastening bolt (9) is slidably fitted in the waist-shaped hole (8.1).

5. The chain buckling fault detection mechanism according to claim 1, characterized in that: Elastic reset components (12) are connected between both ends of the two baffles (11) in the length direction and the first connecting rod (4.1).

6. The chain buckling fault detection mechanism according to claim 5, characterized in that: Each elastic reset member (12) comprises two springs (12.1), and both ends of the two springs (12.1) are respectively abutted and limited between the corresponding baffle (11) and the first connecting rod (4.1).

7. The chain buckling fault detection mechanism according to claim 6, characterized in that: Each elastic reset member (12) further comprises a limit shaft (12.2), the two ends of the limit shaft (12.2) are respectively connected to the corresponding ends of the two baffles (11), and the two springs (12.1) are respectively sleeved on the outside of the two ends of the limit shaft (12.2); both ends of the first connecting rod (4.1) are provided with avoidance holes ( 4.1.1), each of the limit shafts (12.2) is movably arranged in the corresponding avoidance hole (4.1.1).

8. The chain buckling fault detection mechanism according to claim 1, characterized in that: The sensor (6) is arranged at the outer end of the third connecting rod (4.3) and close to one side of the first connecting rod (4.1).

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