Rope belt fixing accessory and rope belt bending fatigue testing machine

Abstract

The invention discloses a rope belt fixing accessory and a rope belt bending fatigue testing machine, the rope belt fixing accessory comprises a connecting block, a sliding seat, a sliding block, a spring and a clamping structure, the rear end of the connecting block is used for being connected with the testing machine, the front end of the connecting block is connected with the rear end of the sliding seat, and the sliding block capable of sliding back and forth is inserted into the sliding seat; the sliding block can extend out of the front end of the sliding seat, a mounting cavity is formed in the sliding block, an opening communicated with the interior of the sliding seat is formed in the rear side of the mounting cavity, a spring arranged in the front-back direction is connected between the interior of the sliding seat and the mounting cavity, and the spring is used for restraining the sliding block from forwards extending out of the sliding seat; and the front end of the sliding block is connected with a clamping structure for clamping the end part of the test rope belt. According to the bending fatigue testing machine, the problem that the measurement precision is affected due to the fact that extra tensile stress occurs when a common crank rocker type bending fatigue testing machine is used for testing is solved.

Description

Technical Field

[0001] This invention relates to the field of rope and belt bending fatigue testing technology, specifically to a rope and belt fixing accessory and a rope and belt bending fatigue testing machine. Background Technology

[0002] Currently, elevator wire rope bending fatigue testing machines, or steel strip bending fatigue testing machines, are commonly used for fatigue testing of ropes or strips. The testing principle of the bending fatigue testing machine is to apply a certain tension to the wire rope or steel strip used in elevators, simulating repeated bending under elevator load, in order to complete the fatigue life test. It requires a high operating frequency and is closer to the real-world application scenario of elevators.

[0003] As attached Figure 8 As shown, common crank-rocker type bending fatigue testing machines are low in cost and widely used. Their main principle is that the ends of the rocker arm of the crank-rocker mechanism are fixed to the two ends of the test rope or test belt, forming a closed loop. The test rope or test belt of the closed loop passes around a certain number of guide wheels and test wheels. During the test, the rocker arm of the crank-rocker mechanism is driven by a motor to swing, thereby causing the test rope or test belt of the closed loop to slide around the guide wheels and test wheels to complete the test.

[0004] However, the trajectory of the rocker arm swinging is an arc, not along the closed loop direction. Therefore, the length of this closed loop will theoretically change during the swinging process, resulting in a large tensile stress. That is, the rope will be subjected to high-frequency tension and compression during the test, such as 60 times / min. This does not match the actual operating conditions of elevator wire ropes and does not meet the national standard requirement that the testing machine should closely match the actual working conditions. Therefore, the tensile stress generated seriously affects the accuracy of the measurement.

[0005] Therefore, there is an urgent need for a rope fixing accessory and a rope bending fatigue testing machine to solve the problem that common crank-rocker type bending fatigue testing machines will generate additional tensile stress during testing, which affects the measurement accuracy. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a rope fixing accessory and a rope bending fatigue testing machine, thereby solving the problem that common crank-rocker type bending fatigue testing machines experience additional tensile stress during testing, which affects measurement accuracy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A rope fixing accessory, characterized in that it includes a connecting block, a sliding seat, a sliding block, a spring, and a clamping structure. The rear end of the connecting block is used to connect to a testing machine, and the front end of the connecting block is connected to the rear end of the sliding seat. A sliding block that can slide back and forth is inserted into the sliding seat. The sliding block can extend from the front end of the sliding seat. An installation cavity is opened in the sliding block. An opening communicating with the interior of the sliding seat is provided on the rear side of the installation cavity. A spring arranged in the back-to-back direction is connected between the interior of the sliding seat and the installation cavity. The spring is used to constrain the sliding block to extend forward out of the sliding seat. A clamping structure for clamping the end of the test rope is connected to the front end of the sliding block.

[0009] To optimize the above technical solution, the specific measures also include: Furthermore, the connecting block has an "I" shaped structure. The rear flange of the "I" shaped connecting block is provided with a mounting hole that runs through the left and right directions of the flange. The mounting hole is used to connect with the testing machine. On the front flange of the connecting block, on the left and right sides of the middle web, there are through holes that run through the front and back respectively. On the rear side of the front flange of the connecting block, at the through hole, an adjusting nut coaxial with the through hole is rotatably installed. The sliding seat near the end of the connecting block is provided with two adjusting screws in the front and back directions. The two adjusting screws respectively move through a through hole and are threadedly connected to the corresponding adjusting nut.

[0010] Furthermore, the side wall of the sliding seat is provided with a through groove that runs through the inside and outside and is arranged in the front-back direction. The side wall of the sliding seat is also provided with a scale along the direction of the groove. The side wall of the sliding block is provided with a pointer slider corresponding to the groove. The pointer slider is slidably arranged in the groove. The end of the pointer slider that extends outward from the groove is provided with a pointer.

[0011] Furthermore, the clamping structure includes a fixed plate and a mounting plate. The front end of the sliding block is fixedly connected to the fixed plate. The fixed plate has two rows of screw holes arranged parallel to each other in the front-back direction. The mounting plate has corresponding mating holes. The mounting plate and the fixed plate are connected by bolts passing through the mating holes and threaded through the screw holes.

[0012] Furthermore, the upper end of the fixing plate is provided with a groove in the front-to-back direction, the groove being used to place the end of the test rope.

[0013] Furthermore, the lower end of the mounting plate is provided with a front-to-back limiting groove corresponding to the groove, and when the fixing plate and the mounting plate are closed, the maximum distance between the limiting groove and the groove is less than the diameter of the test rope.

[0014] Furthermore, a rope bending fatigue testing machine, using the aforementioned rope fixing accessory, is characterized in that: the testing machine includes a base, a mounting rod, a first connecting rod, a second connecting rod, a drive motor, a mounting frame, and test wheels. The base is equipped with a drive motor, and the output shaft of the drive motor is provided with a vertical drive wheel. A vertical mounting rod is provided on one side of the base located radially from the drive wheel. The upper end of the mounting rod is hinged to one end of the first connecting rod, and the other end of the first connecting rod is hinged to two sets of connecting parts, each set of connecting parts being used to connect one of the connecting blocks. The middle section of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the end face of the drive wheel offset from the center. A vertical mounting frame is provided on the base located on the other side of the base located radially from the drive wheel, and two test wheels with staggered vertical distribution are rotatably mounted on the mounting frame.

[0015] Furthermore, it also includes a guide wheel, which is rotatably mounted on the mounting bracket and located between the two test wheels.

[0016] Furthermore, there are two mounting brackets, which are respectively located on both sides of the test wheel axial direction.

[0017] Furthermore, each set of connectors includes two connecting plates and a connecting shaft. The end of the first connecting rod is provided with a hinge post. One end of each of the two connecting plates in each set of connectors is respectively hinged to both sides of the hinge post. The other end of the two connecting plates is connected to the connecting shaft. The rear end of the connecting block is provided with a mounting hole, and the connecting shaft is rotatably disposed in the mounting hole of the connecting block.

[0018] The beneficial effects of this invention are: This invention facilitates the connection and use of the rope fixing accessory with the testing machine through the mounting holes on the connecting block. The sliding seat, sliding block, and spring allow the spring to directly provide the preload force for the test rope. Furthermore, during the testing phase, when the testing machine drives the rope fixing accessory to move, causing a change in the length of the closed-loop structure formed by the test rope, the spring reacts quickly to meet the length change requirements, avoiding geometric changes in the rope length. The sliding seat and sliding block then slide relative to each other, maintaining a stable connection and preventing additional tensile stress on the test rope, thus ensuring the accuracy of the test. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a rope and strap fixing accessory proposed in this invention; Figure 2 This is a schematic diagram illustrating the adjustment of an adjusting nut for a rope and strap fixing accessory proposed in this invention. Figure 3 This is a schematic diagram illustrating the movement of a pointer slider in a rope fixing accessory proposed in this invention; Figure 4This is a schematic diagram of the clamping structure of a rope and strap fixing accessory proposed in this invention. Figure 5 This is a schematic diagram of the overall structure of a rope bending fatigue testing machine proposed in this invention. Figure 1 ; Figure 6 This is a schematic diagram of the overall structure of a rope bending fatigue testing machine proposed in this invention. Figure 2 ; Figure 7 This is a schematic diagram of the connection of the connecting parts of the rope bending fatigue testing machine proposed in this invention; Figure 8 This is a connection diagram of an existing testing machine.

[0020] Reference numerals: 1. Connecting block, 2. Adjusting nut, 3. Adjusting screw, 4. Sliding seat, 5. Sliding block, 6. Clamping structure, 7. Slide groove, 8. Spring, 9. Pointer slider, 10. Test rope, 11. Testing machine, 111. Base, 112. Mounting rod, 113. First connecting rod, 114. Second connecting rod, 115. Connecting piece, 116. Drive motor, 117. Drive wheel, 118. Mounting bracket, 119. Test wheel, 120. Guide wheel. Detailed Implementation

[0021] The technical solutions in 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.

[0022] As attached Figure 1 As shown, a rope fixing accessory includes a connecting block 1, a sliding seat 4, a sliding block 5, a spring 8, and a clamping structure 6. The rear end of the connecting block 1 is used to connect to the testing machine 11, and the front end of the connecting block 1 is connected to the rear end of the sliding seat 4. A sliding block 5 that can slide back and forth is inserted into the interior of the sliding seat 4. The sliding block 5 can extend from the front end of the sliding seat 4. An installation cavity is provided inside the sliding block 5, and an opening communicating with the interior of the sliding seat 4 is provided on the rear side of the installation cavity. A spring 8 arranged in the back and forth direction is connected between the interior of the sliding seat 4 and the installation cavity. The spring 8 is used to constrain the sliding block 5 to extend forward out of the sliding seat 4. The front end of the sliding block 5 is connected to a clamping structure 6 for clamping the end of the test rope 10.

[0023] The present invention facilitates the connection and use of the rope fixing accessory with the testing machine 11 through the mounting hole on the connecting block 1. Through the setting of the sliding seat 4, the sliding block 5 and the spring 8, the spring 8 can directly provide the loading preload of the test rope 10. At the same time, during the test, when the testing machine 11 drives the rope fixing accessory to move, causing the length of the closed loop structure formed by the test rope 10 to change, the spring 8 reacts quickly and meets the length change requirements, avoiding geometric changes in the length of the rope. The sliding seat 4 and the sliding block 5 correspond to the relative sliding displacement and maintain stable connection, thereby avoiding additional tensile stress on the test rope 10 and ensuring the accuracy of the test.

[0024] As attached Figure 2 As shown, in a specific embodiment based on the above, the connecting block 1 has an "I" shaped structure. The rear flange of the "I" shaped connecting block 1 is provided with a mounting hole that runs through the left and right directions of the flange. The mounting hole is used to connect with the testing machine 11. On the front flange of the connecting block 1, and on the left and right sides of the middle web, there are through holes that run through the front and back respectively. On the rear side of the front flange of the connecting block 1, and at the through hole, an adjusting nut 2 coaxial with the through hole is rotatably installed. The sliding seat 4 is provided with two adjusting screws 3 along the front and back directions near the end of the connecting block 1. The two adjusting screws 3 respectively move through a through hole and are threadedly connected to the corresponding adjusting nut 2.

[0025] In this embodiment, the "I"-shaped connecting block 1 facilitates connection with the testing machine 11. At the same time, the two sides of the middle web of the "I"-shaped connecting block 1 allow the adjusting screw 3 to extend and retract. With the adjustment screw 3 and the adjusting nut 2, the adjusting nuts 2 on both sides can be rotated simultaneously during installation to change the working distance between the connecting block 1 and the sliding seat 4, thereby adjusting and determining the preload of the spring 8.

[0026] As attached Figure 3 As shown, in another specific embodiment based on the above, the side wall of the sliding seat 4 is provided with a sliding groove 7 that is open inside and out and arranged in the front and back direction. The side wall of the sliding seat 4 is also provided with a scale along the direction of the sliding groove 7. The side wall of the sliding block 5 is provided with a pointer slider 9 corresponding to the sliding groove 7. The pointer slider 9 is slidably arranged in the sliding groove 7. The end of the pointer slider 9 that extends outward from the sliding groove 7 is provided with a pointer.

[0027] In this embodiment, the elongation data of spring 8 can be obtained through pointers and scales.

[0028] As attached Figure 4As shown, in another specific embodiment based on the above, the clamping structure 6 includes a fixed plate and a mounting plate. The front end of the sliding block 5 is fixedly connected to the fixed plate. The fixed plate has two rows of screw holes arranged parallel to each other in the front-back direction. The mounting plate has corresponding mating holes. The mounting plate and the fixed plate are connected by bolts passing through the mating holes and threaded through the screw holes.

[0029] In this embodiment, the bolts can be removed and the fixing plate and mounting plate can be separated as needed to facilitate the assembly of the end of the test rope 10. Then, the fixing plate and mounting plate can be tightened with bolts to achieve the installation and fixation of the test rope 10.

[0030] In a further specific embodiment based on the above, the upper end of the fixing plate is provided with a groove in the front-to-back direction, the groove being used to place the end of the test rope 10.

[0031] In this embodiment, the end of the test rope 10 can be easily positioned by means of the groove.

[0032] In a further specific embodiment based on the above, the lower end of the mounting plate is provided with a front-to-back limiting groove corresponding to the groove, and when the fixing plate and the mounting plate are closed, the maximum distance between the limiting groove and the groove is less than the diameter of the test rope 10.

[0033] In this embodiment, the test rope 10 can be accurately positioned using the groove and the limiting groove. At the same time, the maximum distance between the limiting groove and the groove is less than the diameter of the test rope 10, which ensures the clamping and limiting of the test rope 10.

[0034] As attached Figure 5 Appendix Figure 6 and attached Figure 7 As shown, an embodiment of the present invention provides a rope bending fatigue testing machine that utilizes the aforementioned rope fixing accessories. The testing machine 11 includes a base 111, a mounting rod 112, a first connecting rod 113, a second connecting rod 114, a drive motor 116, a mounting frame 118, and a test wheel 119. The drive motor 116 is mounted on the base 111, and a vertical drive wheel 117 is provided on the output shaft of the drive motor 116. A vertical mounting rod 112 is provided on one side of the base 111 located radially to the drive wheel 117. The mounting rod 112... The upper end of 2 is hinged to one end of the first connecting rod 113, and the other end of the first connecting rod 113 is hinged to two sets of connecting parts 115. Each set of connecting parts 115 is used to connect a connecting block 1. The middle section of the first connecting rod 113 is hinged to one end of the second connecting rod 114, and the other end of the second connecting rod 114 is hinged to the end face of the drive wheel 117 offset from the center. A vertical mounting frame 118 is provided on the base 111 on the other side of the drive wheel 117 in the radial direction. Two test wheels 119 are rotatably mounted on the mounting frame 118 with their heights and positions staggered.

[0035] In this embodiment, after the connecting block 1 of the rope fixing accessory is connected by the connecting member 115, the two ends of the test rope 10 are respectively clamped by the two rope fixing accessories. Then, the drive motor 116 drives the drive wheel 117 to rotate and drives the rocker structure composed of the first connecting rod 113 and the second connecting rod 114 to move, thereby driving the connecting member 115 and the connecting block 1 to move, so as to test the test rope 10 wrapped on the two test wheels 119.

[0036] In a specific embodiment based on the above-mentioned testing machine, a guide wheel 120 is also included, which is rotatably mounted on the mounting frame 118 and located between the two test wheels 119.

[0037] In this embodiment, the test rope 10 can be wound in an S-shape on one side by means of the guide wheel 120.

[0038] In another specific embodiment based on the above-described testing machine, two mounting brackets 118 are provided, and the two mounting brackets 118 are respectively arranged on both sides of the test wheel 119 along the axial direction. In this way, the stability of the test wheel 119 during installation and use can be increased.

[0039] In another specific embodiment based on the above-mentioned testing machine, each set of connecting parts 115 includes two connecting plates and a connecting shaft. The end of the first connecting rod 113 is provided with a hinge post. One end of each of the two connecting plates of each set of connecting parts 115 is respectively hinged to both sides of the hinge post. The other end of the two connecting plates is connected to a connecting shaft. The rear end of the connecting block 1 is provided with a mounting hole. The connecting shaft is rotatably disposed in the mounting hole of the connecting block 1.

[0040] One specific embodiment of the present invention is as follows: The rope fixing accessory and the rope bending fatigue testing machine are connected and installed by the connecting shaft of the connector 115 and the mounting hole at the rear end of the connecting block 1. When in use, first wind the test rope 10 onto the corresponding test wheel 119 as needed, then clamp and fix the two ends of the test rope 10 through the clamping structure 6 of the two rope fixing accessories to form a closed loop structure. Then, rotate the two adjusting nuts 2 on one rope fixing accessory simultaneously as needed to adjust the loading preload provided by the spring 8. During the test phase, the drive motor 116 of the test machine 11 is turned on, driving the active wheel 117 to rotate and driving the rocker structure composed of the first connecting rod 113 and the second connecting rod 114 to move, thereby driving the rope fixing accessory to move the end of the test rope 10, so as to carry out the test of the test rope 10. When the length of the closed-loop structure formed by the test rope 10 changes, the spring 8 reacts quickly to meet the length change requirements, avoiding geometric changes in the length of the rope. The sliding seat 4 and the sliding block 5 then slide relative to each other and maintain a stable connection, thereby avoiding additional tensile stress on the test rope 10 and ensuring the accuracy of the test until the end of the test.

[0041] This invention can be used for force loading and rope / belt fixation in new testing machines, as well as for upgrading older testing machines.

[0042] This invention provides preload through spring 8, avoiding the high-frequency changes in force within the belt or rope during conventional gravity loading. When these changes exceed the allowable range of gravitational acceleration, the entire system may become partially unloaded, leading to a near-weightless situation. This invention significantly reduces the high-frequency tension and compression of the wire rope. The tension F caused by the geometric motion of the rocker arm within the rope can be reduced to 1 / 10 of its original value. Using a softer spring can further reduce this.

[0043] Specifically, the setting of spring 8 makes F = kg x becomes F = kg kt / (kg+kt) x, the spring elastic coefficient Kt is less than or equal to the elastic coefficient of the wire rope part kg / 9, the deformation x of spring 8 is mainly borne by one side of spring 8, thereby reducing the drastic force change caused by the change of geometric size inside the wire rope.

[0044] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in the invention are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that those skilled in the art will understand that various changes, modifications, substitutions, refinements, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations should be considered within the scope of protection of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rope and strap fixing accessory, characterized in that: The device includes a connecting block (1), a sliding seat (4), a sliding block (5), a spring (8), and a clamping structure (6). The rear end of the connecting block (1) is used to connect to the testing machine (11), and the front end of the connecting block (1) is connected to the rear end of the sliding seat (4). The sliding seat (4) is fitted with a sliding block (5) that can slide back and forth. The sliding block (5) can extend from the front end of the sliding seat (4). The sliding block (5) has an installation cavity. The rear side of the installation cavity has an opening that communicates with the interior of the sliding seat (4). The interior of the sliding seat (4) and the installation cavity are connected by a spring (8) arranged in the front and rear direction. The spring (8) is used to constrain the sliding block (5) to extend forward out of the sliding seat (4). The front end of the sliding block (5) is connected to a clamping structure (6) for clamping the end of the test rope (10).

2. The rope and strap fixing accessory according to claim 1, characterized in that: The connecting block (1) has an "I" shaped structure. The rear flange of the "I" shaped connecting block (1) is provided with a mounting hole that runs through the left and right directions of the flange. The mounting hole is used to connect with the testing machine (11). On the front flange of the connecting block (1), and on the left and right sides of the middle web, there are through holes that run through the front and back respectively. On the rear side of the front flange of the connecting block (1), and at the through hole, there is an adjusting nut (2) that is coaxial with the through hole. The sliding seat (4) near the end of the connecting block (1) is provided with two adjusting screws (3) in the front and back directions. The two adjusting screws (3) respectively move through a through hole and are threadedly connected to the corresponding adjusting nut (2).

3. The rope and strap fixing accessory according to claim 1, characterized in that: The sliding seat (4) has a sliding groove (7) that runs through the inside and outside and is arranged in the front and back direction. The sliding seat (4) also has a scale along the direction of the sliding groove (7). The sliding block (5) has a pointer slider (9) on its side wall corresponding to the sliding groove (7). The pointer slider (9) is slidably arranged in the sliding groove (7). The pointer slider (9) has a pointer at the end of the pointer slider (9) that extends outward from the sliding groove (7).

4. The rope and strap fixing accessory according to claim 1, characterized in that: The clamping structure (6) includes a fixed plate and a mounting plate. The front end of the sliding block (5) is fixedly connected to the fixed plate. The fixed plate has two rows of screw holes arranged in parallel along the front and rear directions. The mounting plate has corresponding screw holes with mating holes. The mounting plate and the fixed plate are connected by bolts passing through the mating holes and threaded through the screw holes.

5. A rope and strap fixing accessory according to claim 4, characterized in that: The upper end of the fixing plate is provided with a groove in the front-to-back direction, which is used to place the end of the test rope (10).

6. A rope and strap fixing accessory according to claim 5, characterized in that: The lower end of the mounting plate is provided with a front-to-back limiting groove corresponding to the groove, and when the fixing plate and the mounting plate are closed, the maximum distance between the limiting groove and the groove is less than the diameter of the test rope (10).

7. A rope and strap bending fatigue testing machine, using the rope and strap fixing accessory as described in any one of claims 1 to 6, characterized in that: The testing machine (11) includes a base (111), a mounting rod (112), a first connecting rod (113), a second connecting rod (114), a drive motor (116), a mounting frame (118), and a test wheel (119). The drive motor (116) is mounted on the base (111), and a vertical drive wheel (117) is provided on the output shaft of the drive motor (116). A vertical mounting rod (112) is provided on the base (111) on one side radially to the drive wheel (117), and the upper end of the mounting rod (112) is hinged to the first connecting rod (113). At one end of the first connecting rod (113), the other end of the first connecting rod (113) is hinged to two sets of connecting parts (115), each set of connecting parts (115) is used to connect one of the connecting blocks (1), the middle section of the first connecting rod (113) is hinged to one end of the second connecting rod (114), and the other end of the second connecting rod (114) is hinged to the end face of the active wheel (117) offset from the center of the circle; a vertical mounting frame (118) is provided on the base (111) on the other side of the radial direction of the active wheel (117), and two test wheels (119) are rotatably mounted on the mounting frame (118) with their upper and lower parts staggered.

8. A rope bending fatigue testing machine according to claim 7, characterized in that: It also includes a guide wheel (120), which is rotatably mounted on the mounting bracket (118) and located between the two test wheels (119).

9. A rope bending fatigue testing machine according to claim 7, characterized in that: There are two mounting brackets (118), which are respectively located on both sides of the test wheel (119) along the axial direction.

10. A rope bending fatigue testing machine according to claim 7, characterized in that: Each set of connectors (115) includes two connecting plates and a connecting shaft. The end of the first connecting rod (113) is provided with a hinge post. One end of the two connecting plates of each set of connectors (115) is respectively hinged to both sides of the hinge post. The other end of the two connecting plates is connected to a connecting shaft. The rear end of the connecting block (1) is provided with a mounting hole. The connecting shaft is rotatably set in the mounting hole of the connecting block (1).

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