Rapid replacement device for torque safety shear pin of heavy transmission test bed

Abstract

The utility model discloses a rapid replacement device for a torque safety shear pin of a heavy transmission test bed, the safety shear pin is located in a shear pin hole of an I-shaped flange tool of the test bed, and the rapid replacement device comprises a pull-out bolt, a rotating nut and a supporting sleeve; the device further comprises a positioning sleeve, an ejection bolt, a positioning locking bolt and a positioning pin. According to the utility model, the safety shear pin which cannot be normally disassembled due to deformation fracture can be rapidly replaced, the damage to the test bench caused by the replacement of the safety shear pin is avoided, the labor intensity can be reduced, the operation is simple, convenient and rapid, the time for replacing the safety shear pin is shortened, the test bench is effectively protected, and the utilization rate of the test bench is effectively improved. The product experiment progress is accelerated.

Description

Technical Field

[0001] This utility model relates to a quick-change device for torque safety shear pins on a heavy-duty transmission test bench. Background Technology

[0002] In the relevant testing process of heavy-duty transmission performance and fatigue life test benches, the torque requirement at the front input end is around 3000 Nm, and the speed is around 2000 r / min. The torque requirement at the rear output end is around 40000-50000 Nm, and the speed is around 2700 r / min. The safety shear pin is a safety protection device that prevents damage to the test bench caused by torque exceeding the limit due to product failure under high speed and high torque conditions. Under huge torque impact, the safety shear pin will deform and break. Because the safety shear pin is dimensionally matched with the shear pin hole of the test bench, the fracture and deformation will make it difficult to remove it from the shear pin hole, making replacement of the shear pin difficult. At the same time, due to the compact layout of the test bench, the space for replacing the shear pin is also relatively small. Even if the safety shear pin has a disassembly threaded hole, it is difficult to remove and replace it using the disassembly threaded hole due to the damage and deformation of the safety shear pin and the narrow disassembly space. Therefore, the only option is to manually hammer it out using a screwdriver or pry bar with a hammer. However, this disassembly method is not only inefficient, but excessive external force can also damage the end face and hole of the safety shear pin, increasing the difficulty of replacement. Furthermore, improper handling can prevent the safety shear pin from being reinstalled later. At the same time, this method is labor-intensive, difficult to guarantee precision, and can easily damage the tooling components of the test bench, affecting its performance and lifespan. Therefore, under the current conditions, to accelerate the experimental progress, meet the experimental requirements, and achieve the experimental objectives, it is necessary to be able to quickly disassemble and reassemble the safety shear pin device that has broken due to deformation, while avoiding damage to the test bench during safety shear pin replacement. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a quick replacement device for the torque safety shear pin of a heavy-duty transmission test bench. In existing technologies, damage to the torque safety shear pin at the input and output ends of the heavy-duty transmission performance and fatigue life test bench, and the need to replace the torque safety shear pin, can become a major obstacle affecting the experimental progress. To meet the testing requirements of new products, it is necessary to optimize and modify the disassembly and assembly of the torque safety shear pin at the input and output ends of the heavy-duty transmission performance and fatigue life test bench. This utility model relates to a quick-change device for the input and output torque safety shear pins of a heavy-duty transmission performance and fatigue life test bench. It replaces the traditional manual method of using screwdrivers or pry bars with hammers. This fixture, tailored to the test bench's structural features, utilizes the safety shear pin mounting holes, positioning locking threaded holes, and the end face of the I-beam flange fixture. Employing the principles of pulling and lead screws, it cleverly and quickly replaces safety shear pins that cannot be properly disassembled due to deformation or breakage, while avoiding damage to the test bench during replacement, ensuring the safe and stable operation of the test bench. By utilizing the existing test bench structure and space, this device achieves low labor intensity, convenient installation, and high efficiency in replacing safety shear pins, improving experimental progress, meeting experimental requirements, and achieving experimental objectives, while simultaneously preventing damage to the test bench during replacement.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A quick-change device for a torque safety shear pin on a heavy-duty transmission test bench, wherein the safety shear pin is located in the shear pin hole of the I-beam flange tooling of the test bench, and the quick-change device includes a pull-out bolt, a swivel nut, and a support sleeve.

[0006] The support sleeve has an opening at the bottom and a small hole on its top surface. The support sleeve can coaxially cover one side of the shear pin hole, and the bottom end of the support sleeve surrounds the outer ring of the shear pin hole. The rotating nut can be threaded onto the pull-out bolt. When the root of the pull-out bolt passes through the small hole on the top surface of the support sleeve and is screwed into the disassembly threaded hole on the end face of the deformed and broken safety shear pin, the rotating nut is located outside the support sleeve and fits against the top surface of the support sleeve. The circumferentially positioned pull-out bolt and the rotating nut can quickly remove the deformed and broken safety shear pin when rotated.

[0007] This utility model also includes the following technical features:

[0008] Specifically, the outer diameter of the rotating nut is larger than the inner diameter of the small hole, so that the rotating nut can fit against the top surface of the support sleeve.

[0009] Specifically, the length of the pull-out bolt is greater than the sum of the height of the support sleeve and the thickness of the rotating nut, so that the root of the pull-out bolt can be screwed into the deformed and broken safety shear pin.

[0010] Specifically, the pull-out bolt head is an external hexagonal head, which can be circumferentially fixed by a wrench; the rotating nut can be rotated by continuous wrench operation, so that the pull-out bolt is axially pulled out of the safety shear pin.

[0011] Specifically, it also includes pin-type positioning sleeves, ejector bolts, and positioning locking bolts;

[0012] The pin-shaped positioning sleeve can be inserted into the shear pin hole on one side of the I-beam flange tooling. The pin-shaped positioning sleeve has an axial threaded through hole at its center and a positioning groove on its outer wall. The shear pin hole has a through threaded hole on its side wall, which is opposite to the positioning groove. The positioning locking bolt can be inserted into the through threaded hole and into the positioning groove to position the pin-shaped positioning sleeve circumferentially and axially. The ejector bolt can be screwed into the threaded through hole of the pin-shaped positioning sleeve and pressed against the fracture surface of the safety shear pin in the shear pin hole on the other side. By continuing to rotate the ejector bolt, the deformed safety shear pin can be ejected.

[0013] Specifically, it also includes locating pins, which can be inserted into two opposing shear pin holes of adjacent I-beam flange fixtures to position the two I-beam flange fixtures and prevent misalignment and rotation during operation.

[0014] Specifically, the outer diameter of the positioning pin is close to the inner diameter of the shear pin hole so that it can be securely installed in two opposing shear pin holes.

[0015] Specifically, the length of the ejector bolt is greater than the length of the shear pin hole, so that it can pass through the pin-shaped positioning sleeve in the shear pin hole on one side and eject the safety shear pin on the other side.

[0016] Specifically, the outer wall of the pin-shaped positioning sleeve has multiple positioning grooves, which are evenly distributed along the circumference.

[0017] Specifically, the head of the ejector bolt is an external hexagonal head, which can be rotated by continuous application of a wrench.

[0018] Compared with the prior art, this utility model has the following technical effects:

[0019] This invention designs a quick-replacement device for the input and output torque safety shear pins of a heavy-duty transmission performance and fatigue life test bench. This device allows for the rapid replacement of safety shear pins that cannot be properly disassembled due to deformation or breakage, while simultaneously preventing damage to the test bench during replacement. Based on the structural characteristics of the test bench, and utilizing the principles of pull-out and lead screws, the device components are designed to reduce labor intensity, simplify operation, and facilitate quick replacement of safety shear pins. This effectively protects the test bench, improves its utilization rate, and accelerates product testing progress. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the layout structure of the present utility model and the I-beam flange tooling.

[0021] Figure 2 This is a schematic diagram of the layout structure of the present utility model and the I-beam flange tooling.

[0022] Figure 3 This is a schematic diagram of a pin-type positioning sleeve.

[0023] Figure 4 This is a schematic diagram of a locating pin.

[0024] Figure 5 This is a schematic diagram of the support sleeve.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. I-beam flange fixture, 2. Pull-out bolt, 3. Rotary nut, 4. Support sleeve, 5. Safety shear pin, 6. Ejector bolt, 7. Pin-type positioning sleeve, 8. Positioning locking bolt, 9. Positioning pin. Detailed Implementation

[0027] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0028] Example 1:

[0029] like Figures 1 to 5 As shown, this embodiment provides a quick-change device for a torque safety shear pin on a heavy-duty transmission test bench. The safety shear pin 5 is located in the shear pin hole of the I-beam flange fixture 1 on the test bench. The quick-change device includes a pull-out bolt 2, a rotating nut 3, and a support sleeve 4. The support sleeve 4 has an open bottom and a small hole on its top surface. The support sleeve 4 can coaxially cover one side of the shear pin hole, and the bottom end of the support sleeve 4 surrounds the outer ring of the shear pin hole. The rotating nut 3 can be threaded onto the pull-out bolt 2. When the root of the pull-out bolt 2 passes through the small hole on the top surface of the support sleeve 4 and is screwed into the disassembly threaded hole on the end face of the deformed and broken safety shear pin 5, the rotating nut 3 is located outside the support sleeve 4 and fits against the top surface of the support sleeve 4. The circumferentially positioned pull-out bolt 2 and the rotating nut 3 can be rotated to quickly remove the deformed and broken safety shear pin 5.

[0030] The outer diameter of the rotating nut 3 is larger than the inner diameter of the small hole so that the rotating nut 3 can fit against the top surface of the support sleeve 4.

[0031] The length of the pull-out bolt 2 is greater than the sum of the height of the support sleeve 4 and the thickness of the rotating nut 3, so that the root of the pull-out bolt 2 can be screwed into the deformed and broken safety shear pin 5.

[0032] The pull-out bolt 2 has an external hexagonal head, which can be circumferentially fixed by a wrench; the rotating nut 3 can be rotated by continuous wrench operation, so that the pull-out bolt 2 can be axially pulled out of the safety shear pin 5.

[0033] Specifically, utilizing the pull-out principle, first screw the rotating nut into the root of the pull-out bolt, then pass the pull-out bolt through the small hole at the top of the support sleeve and screw it into the disassembly threaded hole of the deformed and broken shear pin. This ensures the inner ring of the support sleeve is positioned against the outer circumference of the shear pin hole, preventing interference between the support sleeve and the shear pin hole. The rotating nut is then placed against the top surface of the support sleeve. Use a wrench to hold the hexagonal head of the pull-out bolt, and use another wrench to continuously rotate the nut. This will quickly remove the deformed and broken shear pin. This method is suitable for spaces where the distance from the outer side of the shear pin hole in a safety shear pin I-beam flange tooling is not less than 70mm.

[0034] It also includes a pin-type positioning sleeve 7, an ejector bolt 6, and a positioning locking bolt 8; the pin-type positioning sleeve 7 can be inserted into the shear pin hole on one side of the I-beam flange tooling 1, the pin-type positioning sleeve 7 has an axial threaded through hole in the center, and the outer wall of the pin-type positioning sleeve 7 has a positioning groove; the side wall of the shear pin hole has a through threaded hole, which is a positioning locking threaded hole for the safety shear pin 5 reserved on the I-beam flange tooling 1, and the through threaded hole is opposite to the positioning groove; the positioning locking bolt 8 can be inserted into the through threaded hole and inserted into the positioning groove to position the pin-type positioning sleeve 7 circumferentially and axially; the ejector bolt 6 can be screwed into the threaded through hole of the pin-type positioning sleeve 7 and pressed against the fracture surface of the safety shear pin 5 in the shear pin hole on the other side, and by continuing to rotate the ejector bolt 6, the deformed safety shear pin 5 can be ejected.

[0035] It also includes a locating pin 9, which can be inserted into two opposing shear pin holes of adjacent I-beam flange fixtures 1 to position the two I-beam flange fixtures 1 and prevent misalignment and rotation during operation.

[0036] The outer diameter of the locating pin 9 is close to the inner diameter of the shear pin hole so that it can be securely installed in the two opposing shear pin holes.

[0037] The length of the ejector bolt 6 is greater than the length of the shear pin hole, so that it can pass through the pin-shaped positioning sleeve 7 in the shear pin hole on one side and eject the safety shear pin 5 on the other side.

[0038] The outer wall of the pin-type positioning sleeve 7 has multiple positioning grooves, which are evenly distributed along the circumference.

[0039] The ejector bolt has a hexagonal head at one end, allowing it to be rotated by continuous wrench operation.

[0040] Specifically, utilizing the lead screw principle, since the safety shear pin is installed 180° symmetrically, the shear pin holes on the two opposing I-beam flange fixtures are completely consistent, with eight holes evenly distributed, each hole spaced 45° apart. After the safety shear pin deforms and breaks, the two I-beam flange fixtures can be rotated 45° off-center, and then the locating pin can be inserted into the hole in the same position. The positioning pin and the pin hole are matched to achieve positioning, preventing the two I-beam flange fixtures from rotating out of position during operation. First, the pin-shaped locating sleeve is placed into the pin hole on one side of the safety shear pin I-beam flange fixture, and then the locating locking bolt is used to fix the pin-shaped locating sleeve through the locating locking thread hole of the safety shear pin, preventing it from moving back and forth or rotating circumferentially. Then, the ejector bolt is screwed into the thread hole in the pin-shaped locating sleeve, so that the ejector bolt is in contact with the broken surface of the safety shear pin. Continue to rotate the ejector bolt to eject the deformed safety shear pin. This method is suitable for spaces where the distance from the outer side of the shear pin hole of the safety shear pin I-beam flange fixture is not less than 30mm.

[0041] This invention relates to a quick replacement tool for the input and output torque safety shear pins of a heavy-duty transmission performance and fatigue life test bench. Under the limited space of the test bench, it replaces the traditional method of manually removing the safety shear pins by using a screwdriver or pry bar with a hammer. Utilizing the existing structural features of the test bench, and based on different external space requirements, this device can cleverly and quickly replace safety shear pins that cannot be properly removed due to torque exceeding limits, while avoiding damage to the test bench during replacement.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0043] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0044] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A quick-change device for a torque safety shear pin on a heavy-duty transmission test bench, wherein the safety shear pin (5) is located in the shear pin hole of the I-beam flange fixture (1) of the test bench, characterized in that, The quick-change device includes a pull-out bolt (2), a swivel nut (3), and a support sleeve (4); The support sleeve (4) has an open bottom and a small hole on its top surface; the support sleeve (4) can coaxially cover one side of the shear pin hole, and the bottom end of the support sleeve (4) surrounds the outer ring of the shear pin hole; the rotating nut (3) can be threaded onto the pull-out bolt (2). When the root of the pull-out bolt (2) passes through the small hole on the top surface of the support sleeve (4) and is screwed into the disassembly threaded hole on the end face of the deformed and broken safety shear pin (5), the rotating nut (3) is located outside the support sleeve (4) and fits against the top surface of the support sleeve (4); the circumferentially positioned pull-out bolt (2) and the rotating nut (3) can be rotated to quickly remove the deformed and broken safety shear pin (5).

2. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 1, characterized in that, The outer diameter of the rotating nut (3) is larger than the inner diameter of the small hole so that the rotating nut (3) can fit against the top surface of the support sleeve (4).

3. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 1, characterized in that, The length of the pull-out bolt (2) is greater than the sum of the height of the support sleeve (4) and the thickness of the rotating nut (3) so that the root of the pull-out bolt (2) can be screwed into the deformed and broken safety shear pin (5).

4. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 1, characterized in that, The pull-out bolt (2) has an external hexagonal head so that it can be circumferentially fixed by a wrench; the rotating nut (3) can be rotated by continuous action of a wrench so that the pull-out bolt (2) is axially pulled out of the safety shear pin (5).

5. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 1, characterized in that, It also includes a pin-type positioning sleeve (7), an ejector bolt (6), and a positioning locking bolt (8); The pin-shaped positioning sleeve (7) can be inserted into the empty shear pin hole on one side of the I-beam flange fixture (1). The pin-shaped positioning sleeve (7) has an axial threaded through hole at its center and a positioning groove on its outer wall. The shear pin hole has a through threaded hole on its side wall, which is opposite to the positioning groove. The positioning locking bolt (8) can be inserted into the through threaded hole and into the positioning groove to position the pin-shaped positioning sleeve (7) circumferentially and axially. The ejector bolt (6) can be screwed into the threaded through hole of the pin-shaped positioning sleeve (7) and pressed against the fracture surface of the safety shear pin (5) in the shear pin hole on the other side. By continuing to rotate the ejector bolt (6), the deformed safety shear pin (5) can be ejected.

6. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 5, characterized in that, It also includes a positioning pin (9) that can be inserted into two opposing shear pin holes of adjacent I-beam flange fixtures (1) to position the two I-beam flange fixtures (1) and prevent misalignment during operation.

7. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 6, characterized in that, The outer diameter of the positioning pin (9) is close to the inner diameter of the shear pin hole so that it can be securely installed in two opposite shear pin holes.

8. The quick-change device for torque safety shear pins on a heavy-duty transmission test bench as described in claim 5, characterized in that, The length of the ejector bolt (6) is greater than the length of the shear pin hole, so that it can pass through the pin-shaped positioning sleeve (7) in the shear pin hole on one side and eject the safety shear pin (5) on the other side.

9. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 5, characterized in that, The outer wall of the pin-shaped positioning sleeve (7) has multiple positioning grooves, which are evenly distributed along the circumference.

10. The quick-change device for the torque safety shear pin of the heavy-duty transmission test bench as described in claim 5, characterized in that, The head of the ejector bolt (6) is an external hexagonal head, which can be rotated by continuous action of a wrench.

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