Cable ring stiffness inner diameter automatic measuring device

Abstract

The utility model relates to a cable ring stiffness inner diameter automatic measuring device, the cable ring stiffness inner diameter automatic measuring device comprises a main body, a pressing mechanism and a measuring mechanism, the pressing mechanism and the measuring mechanism are arranged on the main body, and the measuring mechanism comprises a supporting block, a guide rod, a lower sleeve, an upper sleeve, a measuring rod, a first connecting rope, a second connecting rope, a first balancing weight and a second balancing weight. The supporting block is arranged on the main body, the guide rod is arranged on the supporting block, the upper sleeve and the lower sleeve are both arranged on the guide rod in a sliding mode, and the upper sleeve and the lower sleeve are both provided with the measuring rods; one end of the first connecting rope is connected with the first balancing weight, the other end of the first connecting rope is connected with the lower sleeve, the lower sleeve always tends to move downwards, and the first connecting rope is tightened under the action of the first balancing weight; one end of the second connecting rope is connected with the second balancing weight, the other end of the second connecting rope is connected with the upper sleeve, and under the action of the second balancing weight, the second connecting rope is tightened, so that the upper sleeve tends to ascend. The method has the effect of improving the applicability.

Description

Technical Field

[0001] This application relates to the technical field of measuring devices, and in particular to an automatic measuring device for the inner diameter of cable ring stiffness. Background Technology

[0002] For pipeline products, especially ring stiffness, a very important performance indicator, it is particularly important because underground pipelines must withstand the weight of the soil covering them and may also be subjected to the heavy pressure of heavy vehicles. Therefore, ring stiffness is often the focus of attention in pipeline product quality.

[0003] Currently, Chinese patent CN212963281U discloses an inner diameter deformation measuring device for testing the ring stiffness of pipes. The device includes a main slide, an upper slider and a lower slider mounted on the main slide, a groove on the main slide, and a drive adjustment component inside the groove to stably drive the upper and lower sliders to slide on the main slide. This inner diameter deformation measuring device for testing the ring stiffness of pipes utilizes the drive adjustment component inside the groove. The drive adjustment component includes a rotating screw rotatably connected inside the groove. A drive device is fixedly connected to one end of the rotating screw located on the outer side of the top of the main slide. Two movable sleeves are rotatably sleeved on the outer side of the rotating screw, and these two movable sleeves are slidably connected inside the groove. The side of the two movable sleeves furthest from the groove is fixedly connected to the upper and lower sliders, respectively. The outer side of the rotating screw is made of two sections of thread with opposite rotation directions.

[0004] Because the upper and lower sliders move synchronously through two moving sleeves, when the inner diameter of the pipe deforms, the deformation at the top of the pipe is generally greater than that at the bottom. Therefore, the aforementioned inner diameter deformation measuring device can only insert the upper and lower deformation probes on the upper slider into the pipe after the pipe has already deformed. Thus, it can only detect how much deformation occurs when the pipe is subjected to a certain force, but cannot detect how much force the pipe is subjected to before it begins to deform, resulting in relatively low applicability. Utility Model Content

[0005] To improve applicability, this application provides an automatic measuring device for the inner diameter of cable ring stiffness.

[0006] This application provides an automatic measuring device for the inner diameter of cable ring stiffness, which adopts the following technical solution:

[0007] An automatic measuring device for the inner diameter of a cable ring stiffness includes a main body and a pressing mechanism. The pressing mechanism is mounted on the main body. The device also includes a measuring mechanism, which comprises a support block, a guide rod, a lower sleeve, an upper sleeve, a measuring rod, a first connecting rope, a second connecting rope, a first counterweight, and a second counterweight. The support block is mounted on the main body, and the guide rod is mounted on the support block. Both the upper and lower sleeves are slidably mounted on the guide rod, and the measuring rod is mounted on both the upper and lower sleeves. One end of the first connecting rope is connected to the first counterweight, and the other end is connected to the lower sleeve. The lower sleeve has a downward tendency to move. Under the action of the first counterweight, the first connecting rope is taut, causing the lower sleeve to continue its downward tendency. One end of the second connecting rope is connected to the second counterweight, and the other end is connected to the upper sleeve. Under the action of the second counterweight, the second connecting rope is taut, causing the upper sleeve to have an upward tendency.

[0008] By adopting the above technical solution, the measuring rods on the upper and lower sleeves are placed inside the cavity of the cable ring. Under the gravity of the lower sleeve and the measuring rod, the measuring rod on the lower sleeve will abut against the inner wall of the cable ring. Under the action of the second counterweight, the upper sleeve and the measuring rod on the upper sleeve move upward, causing the measuring rod on the upper sleeve to abut against the inner wall of the cable ring. When the pressing mechanism squeezes the cable ring, causing the inner diameter of the cable ring to change, the upper and lower sleeves will move along the guide rod. The upper sleeve drives the second connecting rope to move, and the lower sleeve drives the first connecting rope to move. In this way, the movement of the first and second connecting ropes can be used to calculate the change in the inner diameter of the cable ring. Therefore, the measurement mechanism can improve its applicability.

[0009] Optionally, the support block is provided with a pulley assembly, which includes a plurality of first fixed pulleys and a plurality of second fixed pulleys. The plurality of first fixed pulleys and the plurality of second fixed pulleys are all disposed on the support block. The first connecting rope passes around the plurality of first fixed pulleys, and the second connecting rope passes around the plurality of second fixed pulleys.

[0010] By adopting the above technical solution, multiple first fixed pulleys will limit the first connecting rope, and multiple second fixed pulleys will limit the second connecting rope, which can reduce the phenomenon of the first connecting rope and the second connecting rope getting tangled together during movement.

[0011] Optionally, the support block is provided with a first sliding groove and a second sliding groove, the first counterweight is slidably disposed in the first sliding groove, and the second counterweight is slidably disposed in the second sliding groove.

[0012] By adopting the above technical solution, when the first connecting rope moves, the first counterweight will slide in the first groove, and when the second connecting rope moves, it will drive the second counterweight to slide in the second groove. This can reduce the swaying of the first and second counterweights.

[0013] Optionally, the pressing mechanism includes a support frame, a pressing block, and a lifting assembly. The support frame is disposed on the main body, and the pressing block is disposed on the support frame and located above the main body via the lifting assembly.

[0014] By adopting the above technical solution, when the cable ring is located on the main body and pressure needs to be applied to the cable ring, the lifting component is activated. The lifting component drives the lower pressure block towards the main body, so that the lower pressure block applies pressure to the cable ring.

[0015] Optionally, the lifting assembly includes a lifting block, a lifting screw, and a lifting motor. A lifting groove is formed on the support frame, the lifting block is slidably disposed in the lifting groove, and the pressing block is disposed on the lifting block. The lifting screw passes through the lifting block and is threadedly connected to the lifting block. The lifting motor is disposed on the support frame and is connected to one end of the lifting screw.

[0016] By adopting the above technical solution, the lifting motor is started, and the output shaft of the lifting motor drives the lifting screw to rotate. The lifting screw then drives the lifting block to move, and the lifting block drives the lower pressure block to move.

[0017] Optionally, the measuring rod is provided with abutment rollers.

[0018] By adopting the above technical solution, when the measuring rod is located inside the cable ring, the contact roller contacts the inner wall of the cable ring.

[0019] Optionally, both the upper sleeve and the lower sleeve are provided with an extension mechanism, the extension mechanism including a fixing block and an extension block, the fixing block being provided on both the upper sleeve and the lower sleeve, the extension block being disposed on the fixing block, and the measuring rod being disposed on the extension block.

[0020] By adopting the above technical solution, since the extension block is set on the fixed block and the measuring rod is set on the extension block, it is easy for the measuring rod to enter the cable ring when the diameter of the cable ring is relatively small.

[0021] Optionally, the fixing blocks of the upper sleeve and the lower sleeve are provided with a connecting mechanism. The connecting mechanism includes a first connecting block and a second connecting block. The second connecting block is provided at both ends of the first connecting block. The fixing blocks of the upper sleeve and the lower sleeve are each provided with a connecting groove that engages with the second connecting block.

[0022] By adopting the above technical solution, when the equipment is not testing the cable ring, the second connecting block on one end of the first connecting block is engaged with the connecting groove of the fixing block on the upper sleeve, and the second connecting block on the other end of the first connecting block is engaged with the connecting groove of the fixing block on the lower sleeve. In this way, when the cable ring is not being tested, the upper sleeve and the lower sleeve can be connected together, reducing the phenomenon that the upper sleeve is located at the upper end of the guide rod and is inconvenient for later adjustment.

[0023] Optionally, the guide rod is provided with a limiting mechanism, which includes a first limiting block, a second limiting block, a locking block, and a connecting bolt. The first limiting block and the second limiting block are each provided with the locking block, and the guide rod is provided with a locking groove that engages with the locking block. The connecting bolt passes through the first limiting block and is threadedly connected to the second limiting block.

[0024] By adopting the above technical solution, after the upper sleeve and the lower sleeve are connected together, the locking blocks on the first limiting block and the second limiting block are engaged with the locking slots at appropriate positions on the guide rod, and both the first limiting block and the second limiting block abut against the guide rod; then the connecting bolt is threaded through the first limiting block and connected to the second limiting block, so that the first limiting block and the second limiting block will limit the upper sleeve or the lower sleeve; the limiting mechanism can limit the position of the upper sleeve and the lower sleeve on the guide rod, thus facilitating the adjustment by the operator later.

[0025] Optionally, the main body is provided with a moving component, which includes a cylinder and a moving block. The cylinder is disposed on the main body, and the moving block is slidably disposed on the main body and connected to the piston rod of the cylinder; the support block is disposed on the moving block.

[0026] By adopting the above technical solution, the cylinder is activated, and the piston rod of the cylinder drives the moving block support block to move, which in turn affects the position of the measuring rod, thereby improving its applicability.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The designed measuring mechanism improves applicability;

[0029] 2. The mobile component settings improve usability. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the automatic measuring device for cable ring stiffness inner diameter in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the lifting component in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the support block structure in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the installation mechanism in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the connector structure in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure of the defined mechanism in the embodiments of this application.

[0036] Reference numerals: 1. Main body; 2. Pressing mechanism; 21. Support frame; 211. Lifting groove; 22. Pressing block; 23. Lifting assembly; 231. Lifting block; 232. Lifting screw; 233. Lifting motor; 3. Measuring mechanism; 31. Support block; 311. First assembly block; 312. Second assembly block; 3121. First slide groove; 3122. Second slide groove; 313. Third assembly block; 32. Guide rod; 321. Slot; 33. Lower sleeve; 34. Upper sleeve; 35. Measuring rod; 36. First connecting rope; 37. Second connecting rope; 38. First 39. Counterweight; 310. Second counterweight; 4. Abutting roller; 5. Pulley assembly; 41. First fixed pulley; 42. Second fixed pulley; 5. Extension mechanism; 51. Fixed block; 511. Connecting groove; 52. Extension block; 6. Connecting mechanism; 61. First connecting block; 62. Second connecting block; 7. Limiting mechanism; 71. First limiting block; 72. Second limiting block; 73. Locking block; 74. Connecting bolt; 8. Moving assembly; 81. Cylinder; 82. Moving block; 9. Mounting mechanism; 91. Mounting block; 92. Mounting rack; 93. Rotating shaft; 94. Mounting gear. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] This application discloses an automatic measuring device for the inner diameter of cable ring stiffness.

[0039] refer to Figure 1 An automatic measuring device for the inner diameter of cable ring stiffness includes a main body 1, on which a pressing mechanism 2 and a measuring mechanism 3 are provided.

[0040] refer to Figure 1 and Figure 2The pressing mechanism 2 includes a support frame 21 fixedly connected to the main body 1. The support frame 21 is a gantry frame, and lifting slots 211 are provided on the two opposite side walls of the support frame 21 on the side that is close to each other. A lifting assembly 23 is provided on the support frame 21. The lifting assembly 23 includes a lifting block 231. The two ends of the lifting block 231 are respectively slidably disposed in the two lifting slots 211 of the support frame 21. A pressing block 22 is bolted to the lifting block 231 and is located above the main body 1. A lifting screw 232 is rotatably connected in the lifting slot 211. The lifting screw 232 passes through the lifting block 231 and is threadedly connected to the lifting block 231. A lifting motor 233 is fixedly connected to the support frame 21, and the output shaft of the lifting motor 233 is threadedly connected to the lifting screw 232.

[0041] When the lifting motor 233 is started, the output shaft of the lifting motor 233 drives the lifting screw 232 to rotate. The lifting screw 232 drives the upper lifting block 231 to slide in the lifting groove 211, and the lifting block 231 will drive the lower pressure block 22 to move.

[0042] refer to Figure 1 The main body 1 is provided with a movable component 8, which includes a movable block 82 that is slidably connected to the main body 1; a cylinder 81 is connected to the main body 1, the cylinder body of the cylinder 81 is fixed to the main body 1, and the piston rod of the cylinder 81 is connected to the movable block 82.

[0043] When cylinder 81 is activated, the piston rod of cylinder 81 drives the moving block 82 to slide on the main body 1.

[0044] refer to Figure 1 and Figure 3 The movable block 82 has an assembly slot. The measuring mechanism 3 includes a support block 31. The support block 31 includes a first assembly block 311 that engages with the assembly slot. A second assembly block 312 is vertically fixedly connected to the first assembly block 311. A third assembly block 313 is vertically fixedly connected to the end of the second assembly block 312 that is away from the first assembly block 311. The first assembly block 311 and the third assembly block 313 are both perpendicular to the second assembly block 312, and the first assembly block 311 and the third assembly block 313 are located on the same side of the second assembly block 312.

[0045] refer to Figure 3 and Figure 4 The main body 1 is provided with an installation mechanism 9, which includes an installation block 91 slidably connected to a movable block 82, and an installation rack 92 integrally formed on the installation block 91; a rotating shaft 93 is rotatably connected to the movable block 82, and an installation gear 94 that meshes with the installation rack 92 is keyed to the rotating shaft 93. The first assembly block 311 is provided with an installation groove that engages with the installation block 91.

[0046] The first assembly block 311 is snapped into the assembly slot of the moving block 82. Then the rotating shaft 93 is rotated, which drives the mounting gear 94 to rotate. The mounting gear 94 drives the mounting rack 92 to move. The mounting rack 92 drives the mounting block 91 to move towards the first assembly block 311 and snap into the mounting slot on the first assembly block 311.

[0047] refer to Figure 3 A guide rod 32 is fixedly connected to the first assembly block 311, and one end of the guide rod 32 away from the first assembly block 311 is fixedly connected to the third assembly block 313. In this embodiment, the first assembly block 311 and the third assembly block 313 can be detachably connected to the second assembly block 312, and the guide rod 32 can also be detachably connected to the first assembly block 311 and the third assembly block 313.

[0048] An upper sleeve and a lower sleeve are slidably connected to the guide rod 32. The upper sleeve is located on the side of the lower sleeve away from the main body 1, that is, the lower sleeve is located below the upper sleeve. An extension mechanism 5 is provided on both the upper and lower sleeves. The extension mechanism 5 includes a fixing block 51. The fixing block 51 is fixedly connected to both the upper and lower sleeves. An extension block 52 is fixedly connected to the fixing block 51. A measuring rod 35 is fixedly connected to the extension block 52. A roller is rotatably connected to the end of the measuring rod 35 away from the extension block 52.

[0049] refer to Figure 3 The second assembly block 312 is provided with a first sliding groove 3121 and a second sliding groove 3122. The third assembly block 313 is provided with a pulley assembly 4, which includes a plurality of first fixed pulleys 41 and a plurality of second fixed pulleys 42. The plurality of first fixed pulleys 41 and the plurality of second fixed pulleys 42 are rotatably connected to the third assembly block 313. The plurality of first fixed pulleys 41 correspond to the first sliding groove 3121, and the plurality of second fixed pulleys 42 correspond to the second sliding groove 3122.

[0050] A first counterweight 38 is slidably connected in the first groove 3121 of the second assembly block 312. A first connecting rope 36 is connected to the first counterweight 38. The end of the first connecting rope 36 away from the first counterweight 38 passes around multiple first fixed pulleys 41 and connects to the fixed block 51 on the lower sleeve 33. The sum of the weight of the lower sleeve 33, the weight of the fixed block 51, the weight of the extension block 52, the weight of the measuring rod 35, and the weight of the abutting roller 310 is greater than the weight of the first counterweight 38. Thus, under the action of the first counterweight 38, the lower sleeve 33 always tends to move downward and the first connecting rope 36 is always taut. A second counterweight 39 is slidably connected within the second groove 3122 of the second assembly block 312. A second connecting rope 37 is connected to the second counterweight 39. The end of the second connecting rope 37 away from the second counterweight 39 passes over multiple second fixed pulleys 42 and connects to the fixed block 51 on the upper sleeve 34. The sum of the weight of the upper sleeve 34, the fixed block 51, the extension block 52, the measuring rod 35, and the contact roller 310 is less than the weight of the second counterweight 39. Thus, under the action of the second counterweight 39, the upper sleeve 34 always tends to move upward, and when the measuring rod 35 on the upper sleeve 34 is located inside the loop of the cable being measured, the second connecting rope 37 is always taut. In this embodiment, the first connecting rope 36 can also be directly connected to the lower sleeve, and the second connecting rope 37 can be directly connected to the upper sleeve.

[0051] refer to Figure 3 and Figure 5 A connecting mechanism 6 is provided on the fixing block 51 of the upper sleeve 34 and the fixing block 51 of the lower sleeve 33. The connecting mechanism 6 includes a first connecting block 61, and a second connecting block 62 is integrally provided at both ends of the first connecting block 61. A connecting groove 511 is provided on the fixing block 51 of the upper sleeve 34 and the fixing block 51 of the lower sleeve 33. One of the second connecting blocks 62 is engaged with the connecting groove 511 of the fixing block 51 of the upper sleeve 34, and the other second connecting block 62 is engaged with the connecting groove 511 of the fixing block 51 of the lower sleeve 33. In this way, the upper sleeve 34 and the lower sleeve 33 can be connected together when the cable ring is not being inspected.

[0052] refer to Figure 3 and Figure 6 The guide rod 32 has multiple slots 321 and a limiting mechanism 7. The limiting mechanism 7 includes a first limiting block 71 and a second limiting block 72. Both the first limiting block 71 and the second limiting block 72 are fixedly connected with a locking block 73 that can engage with the slots 321. The first limiting block 71 has a through hole and the second limiting block 72 has a threaded hole. The first limiting block 71 is provided with a connecting bolt 74, which passes through the through hole on the first limiting block 71 and is threadedly connected to the threaded hole on the second limiting block 72.

[0053] After the upper sleeve 34 and the lower sleeve 33 are connected together, the locking blocks 73 on the first limiting block 71 and the second limiting block 72 are engaged with the locking slots 321 at appropriate positions on the guide rod 32, and both the first limiting block 71 and the second limiting block 72 abut against the guide rod 32; then the connecting bolt 74 is threaded through the through hole on the first limiting block 71 and threaded through the threaded hole on the second limiting block 72, so that the first limiting block 71 and the second limiting block 72 will limit the upper sleeve 34 or the lower sleeve 33.

[0054] In this embodiment, the upper and lower sleeves can be linear bearings.

[0055] The implementation principle of the automatic measuring device for the inner diameter of a cable ring stiffness according to an embodiment of this application is as follows: When it is necessary to test the cable ring, the cable ring is first placed on the main body 1 and its position is adjusted. Then, the piston rod of the cylinder 81 drives the moving block 82 to move, so that the measuring rods 35 on the upper sleeve and the lower sleeve enter the cable ring. Then, the first limiting block 71 and the second limiting block 72 are both removed from the guide rod 32. Next, the connecting groove 511 on the second connecting block 62 and the fixing block 51 is separated. Under the action of the lower sleeve and the first counterweight 38, the measuring rod 35 on the lower sleeve will move downward, so that the abutting roller 310 corresponding to the lower sleeve abuts against the inner wall of the cable ring, and the first connecting rope 36 is in a taut state. Under the action of the upper sleeve on the second counterweight 39, the measuring rod 35 on the upper sleeve will move upward, so that the abutting roller 310 corresponding to the upper sleeve abuts against the inner wall of the cable ring, and the second connecting rope 37 is also in a taut state.

[0056] Start the lifting motor 233 to move the lower pressure block 22 toward the main body 1. When the lower pressure block 22 applies force to the cable ring and causes the inner diameter of the cable ring to change, the upper sleeve and the lower sleeve will slide on the guide rod 32. The second connecting rope 37 on the upper sleeve will drive the second counterweight 39 to slide in the second slide groove 3122, and the first connecting rope 36 on the lower sleeve will drive the first counterweight 38 to slide in the first slide groove 3121. In this way, both the first connecting rope 36 and the second connecting rope 37 will be displaced.

[0057] A displacement sensor is provided on the second assembly block 312 or the third assembly block 313. The displacement sensor can detect the motion state of the first connecting rope 36 and the second connecting rope 37, and then calculate the change in the inner diameter of the cable ring stiffness based on the motion state of the first connecting rope 36 and the second connecting rope 37.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic measuring device for the inner diameter of a cable ring stiffness, comprising a main body (1) and a pressing mechanism (2), wherein the pressing mechanism (2) is disposed on the main body (1), characterized in that, It also includes a measuring mechanism (3), which includes a support block (31), a guide rod (32), a lower sleeve (33), an upper sleeve (34), a measuring rod (35), a first connecting rope (36), a second connecting rope (37), a first counterweight (38), and a second counterweight (39). The support block (31) is mounted on the main body (1), the guide rod (32) is mounted on the support block (31), and the upper sleeve (34) and the lower sleeve (33) are both slidably mounted on the guide rod (32). Each is equipped with the measuring rod (35); one end of the first connecting rope (36) is connected to the first counterweight (38) and the other end is connected to the lower sleeve (33), the lower sleeve (33) always tends to move downwards, and the first connecting rope (36) is taut under the action of the first counterweight (38); one end of the second connecting rope (37) is connected to the second counterweight (39) and the other end is connected to the upper sleeve (34), and the second connecting rope (37) is taut under the action of the second counterweight (39), so that the upper sleeve (34) tends to rise.

2. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 1, characterized in that, The support block (31) is provided with a pulley assembly (4), which includes a plurality of first fixed pulleys (41) and a plurality of second fixed pulleys (42). The plurality of first fixed pulleys (41) and the plurality of second fixed pulleys (42) are all provided on the support block (31). The first connecting rope (36) passes around the plurality of first fixed pulleys (41), and the second connecting rope (37) passes around the plurality of second fixed pulleys (42).

3. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 2, characterized in that, The support block (31) is provided with a first sliding groove (3121) and a second sliding groove (3122). The first counterweight (38) is slidably disposed in the first sliding groove (3121), and the second counterweight (39) is slidably disposed in the second sliding groove (3122).

4. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 1, characterized in that, The pressing mechanism (2) includes a support frame (21), a pressing block (22) and a lifting assembly (23). The support frame (21) is mounted on the main body (1), and the pressing block (22) is mounted on the support frame (21) and located above the main body (1) via the lifting assembly (23).

5. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 4, characterized in that, The lifting assembly (23) includes a lifting block (231), a lifting screw (232), and a lifting motor (233). A lifting groove (211) is formed on the support frame (21). The lifting block (231) is slidably disposed in the lifting groove (211). The pressing block (22) is disposed on the lifting block (231). The lifting screw (232) passes through the lifting block (231) and is threadedly connected to the lifting block (231). The lifting motor (233) is disposed on the support frame (21) and is connected to one end of the lifting screw (232).

6. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 1, characterized in that, The measuring rod (35) is provided with an abutment roller (310).

7. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 1, characterized in that, Both the upper sleeve (34) and the lower sleeve (33) are provided with an extension mechanism (5). The extension mechanism (5) includes a fixing block (51) and an extension block (52). Both the upper sleeve (34) and the lower sleeve (33) are provided with the fixing block (51). The extension block (52) is disposed on the fixing block (51). The measuring rod (35) is disposed on the extension block (52).

8. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 7, characterized in that, A connecting mechanism (6) is provided on the fixing block (51) of the upper sleeve (34) and the fixing block (51) of the lower sleeve (33). The connecting mechanism (6) includes a first connecting block (61) and a second connecting block (62). The second connecting block (62) is provided at both ends of the first connecting block (61). A connecting groove (511) is provided on the fixing block (51) of the upper sleeve (34) and the fixing block (51) of the lower sleeve (33) to engage with the second connecting block (62).

9. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 7, characterized in that, The guide rod (32) is provided with a limiting mechanism (7), which includes a first limiting block (71), a second limiting block (72), a locking block (73) and a connecting bolt (74). The first limiting block (71) and the second limiting block (72) are both provided with the locking block (73). The guide rod (32) is provided with a locking groove (321) that engages with the locking block (73). The connecting bolt (74) passes through the first limiting block (71) and is threadedly connected to the second limiting block (72).

10. The automatic measuring device for the inner diameter of cable ring stiffness according to claim 1, characterized in that, The main body (1) is provided with a moving component (8), which includes a cylinder (81) and a moving block (82). The cylinder (81) is provided on the main body (1), and the moving block (82) is slidably provided on the main body (1) and connected to the piston rod of the cylinder (81). The support block (31) is provided on the moving block (82).

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