Torque detector

Abstract

The utility model relates to the technical field of tunnel precast block nut torque measurement, and discloses a torque detector, which comprises a shell, an input shaft, a retaining ratchet wheel, a speed reducing mechanism, an inner sleeve and an outer sleeve, the input shaft, the retaining ratchet wheel, the speed reducing mechanism, the inner sleeve and the outer sleeve are mounted on the shell, the outer sleeve is detachably and fixedly mounted on the shell, and the input shaft is connected with the inner sleeve through the speed reducing mechanism. The speed reducing mechanism is detachably connected with the inner sleeve, and the inner sleeve is rotationally connected with the outer sleeve. An inner supporting sleeve is fixed to the output end of the speed reducing mechanism, and the inner sleeve is detachably installed on the inner supporting sleeve. The machining difficulty can be effectively reduced, meanwhile, the second planet carrier and the speed reducing mechanism are protected, if the second planet carrier is directly connected, the second planet carrier needs to be replaced after being damaged, and cost is high; and the damage of the star frame II possibly further causes the damage of other parts of the internal speed reducing mechanism is avoided, and meanwhile, the failure rate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel prefabricated block nut torque measurement technical field more specifically, it relates to a torque detector. BACKGROUND

[0002] The method of cement prefabricated block splicing into a tunnel is a kind of efficient and widely applied technology in modern tunnel construction, and this technology is called prefabricated assembly structure. The following is about how to use cement prefabricated block to build a tunnel process: according to the tunnel design requirements, the cement prefabricated block of different shapes and functions, such as lining ring, is accurately manufactured in factory, to ensure that it meets strict tolerance and strength standards. These prefabricated blocks are then transported to the construction site and hoisted to the predetermined position by crane. While the shield machine is excavated, prefabricated blocks are installed in sequence from the rear, and waterproof devices such as rubber sealing strips are usually provided between prefabricated blocks, and fixed with long bolts or other connecting pieces to ensure the integrity and stability of the structure.

[0003] As shown in Figure 1 For example, to install long bolts, in order to install nuts more conveniently, in order to make the force of nuts uniform, the prefabricated block is provided with a reserved hole for installing nuts, which is roughly equivalent to tilting downward to punch a fan-shaped hole on the prefabricated block, thereby forming a fan-shaped platform that can support nuts and can be operated, that is, the bottom wall of the reserved hole, which is roughly fan-shaped when viewed obliquely from the front; two relatively flat side walls are also formed, which are roughly triangular when viewed from the side; a through hole is formed in the bottom wall for accommodating the long screw rod.

[0004] The force borne by the bolts and nuts connecting the prefabricated blocks depends on multiple factors, including but not limited to the size, shape, weight of the prefabricated block, installation position (such as different parts of the tunnel lining), construction conditions, and expected external loads (such as groundwater pressure, soil lateral pressure, etc.). Therefore, there is no fixed value to describe the size of the force borne by the bolts in all cases. However, some general guidelines can be given: if the prefabricated block is small and the load is low, the diameter of the bolt used for connection will also be relatively small, and the required pretightening force and working stress will also be relatively small. For larger prefabricated blocks or situations that require higher load bearing, larger diameter bolts and nuts are usually used, which have large diameter and can bear greater tensile, shear and fatigue stress.

[0005] With the increase of the diameter of the tunnel, the size of the prefabricated block used is increased accordingly, but the size of the hole on the prefabricated block for inserting the long bolt and the platform for supporting the nut cannot be infinitely enlarged. Similarly, the size of the reserved hole cannot be infinitely enlarged. Because the excessively large hole will weaken the overall structural strength of the prefabricated block, especially form a stress concentration point at the edge of the hole, increase the risk of cracks or fractures, and possibly reduce its durability under long-term load; at the same time, the increase of the hole diameter reduces the effective bearing cross-sectional area, affects the mechanical properties such as bending resistance and shear resistance of the prefabricated block, and may cause uneven stress of the bolt, thereby affecting the reliability of the connection system.

[0006] In summary, with the increase of the prefabricated block, the bolt and the nut can be increased accordingly, but the reserved hole on the prefabricated block cannot be infinitely enlarged accordingly. Therefore, the following situation occurs: on a larger prefabricated block, the reserved hole is relatively small, the nut is relatively large, and a larger torque is required (generally about 2000 Nm, and some even exceed 2000 Nm). The general torque wrench in the prior art cannot be used, and even because of the larger size, it cannot enter the reserved hole.

[0007] The large-torque detection device developed, such as the utility model patent with the publication number CN211317598U and the name of a torque detection device, has the following defects: the thickness of the reaction arm is relatively thin, and when the reaction arm is in contact with the side wall of the prefabricated block, the prefabricated block is under a relatively high pressure, and the side wall of the reserved hole is easily damaged; the structural strength of the reaction arm is low, and the reaction arm is easily deformed when a larger torque is used; in addition, the inner sleeve of the large-torque detection device is connected with the secondary planetary carrier by a key, the inner sleeve is very inconvenient to disassemble and assemble, and when measuring the torque of the nut, the force is directly transmitted to the second planetary carrier, which easily causes damage to the second planetary carrier. Damage to the second planetary carrier will cause damage to the speed reduction mechanism, thereby increasing the failure rate. Utility model content

[0008] The utility model aims to overcome at least one of the above-mentioned defects of the prior art, and provides a torque detector to solve the technical problem that the inner sleeve of the large-torque detection device is connected with the secondary planetary carrier by a key, the inner sleeve is very inconvenient to disassemble and assemble, and when measuring the torque of the nut, the force is directly transmitted to the second planetary carrier, which easily causes damage to the second planetary carrier. Damage to the second planetary carrier will cause damage to the speed reduction mechanism, thereby increasing the failure rate.

[0009] The utility model adopts technical scheme, a kind of torque detector, including shell, input shaft, stop ratchet wheel, speed reduction mechanism, inner sleeve and outer sleeve being installed on shell, the outer sleeve is fixedly installed on shell by detachable way, the input shaft is connected with inner sleeve by speed reduction mechanism, the speed reduction mechanism is detachably connected with inner sleeve, the inner sleeve is rotatably connected with outer sleeve.Inner sleeve and speed reduction mechanism are detachably connected, different inner sleeves can be replaced according to different nuts, and its applicable scene can be effectively increased;Outer sleeve is designed into detachable structure, when its stress is larger deformation or damage, it can also be individually disassembled and replaced, and speed reduction mechanism is directly exposed after disassembly, this way can effectively reduce the maintenance cost of subsequent overhaul, and the difficulty of subsequent overhaul and maintenance can also be reduced;The speed reduction mechanism output end is fixed with inner support sleeve, and the inner sleeve is detachably installed on the inner support sleeve.Compared with prior art, the present scheme increases inner support sleeve, which is more convenient to set corresponding detachable structure on inner support sleeve and inner sleeve, without being set on planetary carrier two of speed reduction mechanism, which can effectively reduce processing difficulty, and simultaneously protects planetary carrier two and speed reduction mechanism, if it is directly connected with planetary carrier two, planetary carrier two needs to be replaced after damage, with high cost;Avoiding the damage of star frame two can further cause the damage of other components of internal speed reduction mechanism, and simultaneously reduce failure rate.

[0010] Further, the inner support sleeve is connected with the inner sleeve in a plug-in manner, and after plug-in assembly, the inner support sleeve and the inner sleeve can be fixedly connected by fastening bolts.

[0011] Further, the inner sleeve has a first end and a second end, an outer circumferential surface of the inner sleeve is a stepped cylindrical structure with a gradually decreasing diameter from the first end to the second end, and an inner portion of the inner sleeve, from the first end to the second end, sequentially includes a gasket hole, a nut hole, a bolt clearance hole, a through hole, and a connecting hole.

[0012] Further, the inner support sleeve has a cavity at one end and a reduced-diameter connector at the other end, with a threaded hole in the center that communicates with the cavity. The connector is inserted into the connecting hole, and the inner support sleeve is fixedly connected to the inner sleeve by a fastening bolt that passes through the through hole and is screwed into the threaded hole. The stepped cylinder gradually reduces in diameter from the first end to the second end, helping to disperse stress and avoid stress concentration when high torque is applied, thereby improving the mechanical strength and service life of the inner sleeve. This design ensures that the inner sleeve can withstand large torsional forces while maintaining shape stability and being less prone to deformation, ensuring the safety and reliability of equipment operation. The various functional holes inside the inner sleeve provide the necessary space for assembly, such as the washer hole for accommodating washers, the nut hole for accommodating nuts or similar components, the bolt clearance hole to allow the bolt to pass without interfering with other components, and the through hole and connecting hole for the passage of the fastening bolt and connection with the inner support sleeve, respectively. The precisely designed hole positions improve assembly accuracy, enhance the tightness of the components, and simplify the installation process while reducing maintenance costs. The inner support sleeve is inserted into the connecting hole of the inner sleeve through its connector, and is fixedly connected by a fastening bolt. This connection not only ensures the stable combination of the two components, but also facilitates disassembly and replacement. It provides a simple and effective connection mechanism that makes the connection between the inner sleeve and the inner support sleeve both strong and flexible, suitable for work environments that require frequent adjustment or maintenance. The cavity at one end of the inner support sleeve reduces weight without affecting its support capacity; the design of the inner support sleeve optimizes the weight-to-strength ratio, ensuring sufficient support while reducing unnecessary material use and improving overall efficiency. In summary, these design details work together to improve the performance of the tunnel precast block torque detector, enabling it to be more effectively applied in actual engineering environments, especially when handling large precast components, providing a reliable torque application solution.

[0013] Further, the outer sleeve has a first end and a second end, and is rotatably connected to the inner support sleeve at one end through composite sleeve one and to the inner sleeve at the other end through composite sleeve two. This design ensures that the outer sleeve can rotate flexibly relative to the inner support sleeve and the inner sleeve while maintaining structural stability and strength, thereby reducing unnecessary friction and wear during torque application and improving the operational efficiency and service life of the equipment; in addition, the use of composite sleeves not only simplifies the assembly process, but also provides good centering, ensuring the accuracy and smoothness of torque transmission and enhancing the reliability and durability of the entire device under high load working conditions.

[0014] Further, the shell is provided with an inner spline, and the inner spline is provided with a clamping groove; the outer sleeve has a first end and a second end, and from the first end side, an outer spline and a ring groove one are sequentially arranged, and the diameter of the ring groove one is smaller than the diameter of the bottom of the spline groove; after the outer spline is inserted into the inner spline, the clamping groove is opposite to part of the ring groove one close to the first end of the outer sleeve, the clamping spring with a width greater than the depth of the clamping groove is arranged in the clamping groove, the L-shaped clamping ring one is inserted between the clamping spring and the bottom of the ring groove one, and the clamping ring two is inserted between the ring groove one and the clamping ring one. The structure design ensures the stable connection between the outer sleeve and the shell, allows the relative rotation between the two, realizes the quick and reliable assembly through the spline and the clamping spring, and further enhances the stability and shock resistance of the connection through the design of the L-shaped clamping ring one and the clamping ring two, prevents accidental loosening during high-torque operation, and ensures the reliable performance of the equipment in a high-strength working environment and the stability during long-term use.

[0015] Further, the ring groove two is arranged on the side of the ring groove one close to the second end of the outer sleeve, the strain gauge is arranged in the ring groove two, and the thickness from the bottom of the ring groove two to the inner wall of the outer sleeve is the thinnest part of the wall of the outer sleeve. The design makes the wall part at the position of the ring groove two the most easily deformed area in the outer sleeve, so as to ensure that the strain gauge can sensitively sense the slight deformation caused by the torque, and provide high-precision torque measurement data; at the same time, the installation of the strain gauge at this specific position not only protects the strain gauge from the external environment, but also optimizes the accuracy of signal acquisition, improves the measurement reliability and response speed of the whole torque instrument, and enhances the performance of the equipment in actual application.

[0016] Further, the first end of the outer sleeve is a reduced cylinder with a reduced diameter, the ring groove one and the ring groove two are arranged on the reduced cylinder, and the annular sensor cover is sleeved on the reduced cylinder. After sleeving, one end of the sensor cover is connected to the port of the shell, and the other end abuts against the end face formed by the reduced diameter of the outer sleeve. The structure not only protects the sensitive strain gauge from external environmental factors such as dust and moisture, but also enhances the mechanical strength of the whole connection area through the sensor cover, ensures the stability and durability of the equipment in a high-strength working environment; at the same time, the design of the reduced cylinder simplifies the assembly process between the outer sleeve and the shell, and makes the sensor cover closely fit to form a sealed whole, improves the protection level of the equipment, and ensures the safety of the internal components and the accuracy of the measurement data.

[0017] Further, the outer sleeve is provided with a counterforce arm, the counterforce arm is an irregular polygon structure, has a wider connecting end and a narrower supporting end, the supporting end has a vertical supporting surface, the supporting surface gradually narrows from the bottom to the top of the special-shaped block, the supporting surface is close to the outer wall of the outer sleeve, and the supporting surface is parallel to a tangent plane of the outer circle of the outer sleeve.

[0018] Compared with the prior art, the beneficial effects of the utility model are that: the inner support sleeve is added, the corresponding detachable structure can be arranged on the inner support sleeve and the inner sleeve more conveniently, the machining difficulty is reduced effectively, the planetary carrier II and the speed reduction mechanism are protected, if the inner support sleeve is directly connected with the planetary carrier II, the planetary carrier II needs to be replaced after damage, the cost is high, the damage of the planetary carrier II can be avoided, the damage of other components of the internal speed reduction mechanism caused by the damage of the planetary carrier II is avoided, and the failure rate is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of part of the tunnel prefabricated blocks in the utility model.

[0020] Figure 2 It is a whole structure sectional view of the utility model.

[0021] Figure 3 It is a sectional view of the inner sleeve of the utility model.

[0022] Figure 4 It is a whole structure sectional view of the utility model. Figure 2 It is a local structure enlarged view of A in the utility model.

[0023] Figure 5 It is a schematic view of the shell and the outer sleeve assembly of the utility model.

[0024] Figure 6 It is a structural schematic view of the special-shaped block of the utility model.

[0025] Figure 7 It is a structural schematic view of the counterforce arm in the reserved hole operation of the utility model.

[0026] Figure 8 It is a schematic view of the utility model in use.

[0027] In the diagram: 1. Outer rod; 2. Inner slide rod; 3. Locking structure; 4. Fixing pin; 5. Ratchet head; 6. First-stage cylinder; 7. Fastening bolt; 8. Connecting hole; 9. Input shaft; 10. Through hole; 11. Washer A; 12. Washer B; 13. Ratchet cover; 14. Reversing knob; 15. Bolt clearance hole; 16. Nut hole; 17. Handle; 18. Planetary gear one; 19. Planetary gear one pin; 20. Planet carrier one; 21. Sun gear one; 22. Planetary gear two; 23. Planetary gear two pin; 24. Planet carrier two; 25. Sun gear two; 26. 1. Composite bushing 1; 27. Inner support sleeve; 28. Snap ring 1; 29. ​​Snap ring 2; 30. Sensor cover; 31. Composite bushing 2; 32. Outer sleeve; 33. Inner sleeve; 34. Reaction arm; 35. Torque measuring instrument; 36. Housing; 37. Connecting block; 38. Irregular block; 39. Pin; 40. Slot; 41. Support surface; 42. Reduced cylinder; 43. Ring groove 2; 44. Internal spline; 45. Snap groove; 46. Ring groove 1; 47. Snap ring; 48. Second-order cylinder; 49. Third-order cylinder; 50. Washer hole; 51. External spline. Detailed Implementation

[0028] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] like Figures 1-8 As shown, this solution discloses a torque detector, including a housing 36, an input shaft 9, a stop ratchet, a reduction mechanism, an inner sleeve 33, and an outer sleeve 32.

[0030] The input shaft 9 is mounted on the housing 36 and connected to the inner sleeve 33 via a reduction gear mechanism. Specifically, for example... Figure 2 As shown, the reduction mechanism includes a first-stage planetary reduction mechanism and a second-stage planetary reduction mechanism. The first-stage planetary reduction mechanism includes planetary gear 18, planetary gear 1 pin 19, planetary carrier 20, and sun gear 21. The second-stage planetary reduction mechanism includes planetary gear 22, planetary gear 2 pin 23, planetary carrier 24, and sun gear 25. The input shaft 9 is connected to sun gear 21, which meshes with planetary gear 18. Planetary gear 18 is mounted on planetary carrier 20 and meshes with a gear ring provided on the inner side of housing 36. Planetary carrier 20 is keyed to sun gear 25, which meshes with planetary gear 22. Planetary gear 22 is mounted on planetary carrier 24 and meshes with a gear ring provided on the inner side of housing 36. The installation method of each component of the first-stage and second-stage planetary reduction mechanisms within housing 36 is well known to those skilled in the art and will not be described in detail here.

[0031] An inner support sleeve 27 is fixedly installed on the planetary carrier 24, and an inner sleeve 33 is detachably installed on the inner support sleeve 27. Specifically, the inner support sleeve 27 has a rotating body structure, with a cavity inside one end and a connector with a reduced diameter at the other end, and a threaded hole communicating with the cavity in the center.

[0032] like Figure 3 As shown, the inner sleeve 33 has a first end and a second end. The inner sleeve 33 is a stepped cylindrical structure with a diameter that gradually decreases from the first end to the second end. Starting from its outer surface, it has three steps: a first-stage cylinder 6, a second-stage cylinder 48, and a third-stage cylinder 49. Inside the inner sleeve 33, from the first end to the second end, there are, in sequence, a washer hole 50, a nut hole 16, a bolt clearance hole 15, a through hole 10, and a connecting hole 8. The diameter of the through hole 10 is smaller than the diameter of the connecting hole 8. The connecting hole 8 is inserted into the connector. The inner sleeve 33 can be fixedly connected to the inner support sleeve 27 by passing through the through hole 10 and threadedly connecting it to the threaded hole in the middle of the inner support sleeve 27 through the fastening bolt 7.

[0033] like Figure 2 As shown, one end of the outer sleeve 32 is rotatably connected to the inner support sleeve 27 via a composite bushing 1. The inner side of the outer sleeve 32 and the outer side of the inner support sleeve 27 are respectively provided with a platform for installing the composite bushing 1 and a limiting flange. The other end of the outer sleeve 32 is rotatably connected to the inner sleeve 33 via a composite bushing 2 31. The composite bushing 2 31 is located at the position of the first-order cylinder 6. After installation, the outer circumferential surface of the other end of the outer sleeve 32 is flush with the outer circumferential surface of the first end of the inner sleeve 33, which can effectively improve its structural strength and aesthetics.

[0034] like Figures 4-6 As shown, one end of the outer sleeve 32 is fixedly connected to the housing 36. Specifically, one end of the outer sleeve 32 is detachably connected to the housing 36. The housing 36 is provided with an internal spline 44, and the internal spline 44 is provided with a groove 45. One end of the outer sleeve 32 is a reduced-diameter cylinder 42. On the outer circumference of the reduced-diameter cylinder 42, starting from one end side, an external spline 51, an annular groove 46, and an annular groove 43 are sequentially provided. The diameter of the annular groove 46 is smaller than the diameter of the bottom of the keyway of the external spline 51. When connected to the housing 36, the external spline 51 is inserted into the keyway of the internal spline 44. The internal spline 44 is longer than the external spline 51. Figure 4 As shown, at this time, the slot 45 is exactly opposite to part of the annular groove 46. The space provided by the annular groove 46 allows the retaining spring 47 to be installed in the slot 45. Then, the retaining ring 28 with an L-shaped end face is installed. The retaining ring 28 has a horizontal part and a vertical part. The horizontal part of the retaining ring 28 supports the retaining spring 47 from the inside out to prevent shrinkage. Finally, the retaining ring 29 is installed. The retaining ring 29 and the vertical part of the retaining ring 28 just fill the gap between the annular groove 46 and the housing 36, so that the horizontal part of the retaining ring 28 will not come out of the retaining spring 47.

[0035] The ring groove two 43 is used for sticking the strain gauge, the thickness of the position where the ring groove two 43 is located is the thinnest part of the wall thickness of the outer sleeve 32, and the wall thickness of each part of the shell 36 is greater than the wall thickness of the position where the ring groove two 43 of the outer sleeve 32 is located, so that the wall part of the position where the ring groove two 43 is located is relatively thin and is most likely to deform, so that the strain gauge stuck in the ring groove two 43 can be more sensitive to sensing; the outer sleeve 32 is made of aluminum alloy material.

[0036] A sensor cover 30 is installed on the outer circumferential surface of the reduced cylinder 42, which is a ring structure and can cover part of the ring groove two 43 and the ring groove one 46, used for protecting the strain gauge, while restraining the snap ring one 28 and the snap ring two 29 inside the snap ring one 28, after installation, one end is just butted against the shell 36, the outer wall surface is just flush with the outer wall surface of the shell 36, and the other end is butted against the diameter-reduced end surface of the outer sleeve 32; the sensor cover 30 can be designed as a two-half structure and assembled into a whole circle by small bolts.

[0037] The outer sleeve 32 is provided with a counterforce arm 34, the counterforce arm 34 includes a connecting block 37 and a special-shaped block 38, the connecting block 37 is fixed on the outer sleeve 32 and is arranged radially along the outer sleeve 32 and is integrally formed with the outer sleeve 32 into a cuboid, and can also be other shapes, such as triangular prism, cylinder, etc.; the special-shaped block 38 is provided with a slot 40, the shape of the slot 40 matches the shape of the connecting block 37, the special-shaped block 38 is inserted on the connecting block 37 through the slot 40, and the connecting block 37 and the special-shaped block 38 are fixedly connected together by penetrating a vertical concentric pin hole provided on the special-shaped block 38 and the connecting block 37 by a pin 39, the pin hole on the connecting block 37 and the special-shaped block 38 is not less than two; the special-shaped block 38 is an irregular polygon structure as a whole, including a relatively wide connecting end and a relatively narrow supporting end, and further including an arc-shaped side end and a multi-inclined side end; the slot 40 is arranged on the connecting end, the relatively wide connecting end can provide a relatively long force arm, so that the whole side of the connecting block 37 is subjected to force, the connecting block 37 is more evenly subjected to force and is not easy to deform, the connecting end is provided with notches on the top side and the bottom side close to one side of the outer sleeve 32, which can save materials, after the special-shaped block 38 is installed on the connecting block 37, the arc-shaped side is concentric with the outer circumferential surface of the outer sleeve 32 and has a distance of about 8 mm; the supporting end has a supporting surface 41, the supporting surface 41 is arranged on the supporting end and is close to the outer circle of the outer sleeve 32, i.e. about 8 mm, the multi-inclined side end has at least two inclined surfaces, after installation, the supporting surface 41 is close to the outer sleeve 32 and parallel to a section of the outer circle of the outer sleeve 32, the supporting surface 41 is used for contacting the side wall of the prefabricated block and plays a supporting role, the inclined surfaces are inclined from top to bottom to the outside of the special-shaped block 38, and the supporting surface 41 is in a trapezoidal shape of narrow top and wide bottom through the inclined surfaces, which is just suitable for the side wall of the reserved hole which is gradually narrowed from inside to outside (such as Figure 1As shown, the support surface 41 is just located in the deep part of the side wall of the reserved hole (as shown in the figure) when supporting, so that the support surface 41 is just located in the deep part of the side wall of the reserved hole (as shown in the figure) when supporting Figure 7 As shown, the outer edge of the inclined side wall of the reserved hole is not stressed, which well protects the inclined outer edge. The function of the inclined surface close to the support surface 41 is mainly to form a trapezoidal shape of the support surface 41, and the other inclined surface plays an over-acting role, which can save more materials while ensuring a higher connection strength; the thickness of the special-shaped block 38 is about three times the thickness of the connecting block 37, and the slot 40 connected with the connecting block 37 is arranged at the middle position (with reference to the thickness) of the special-shaped block 38.

[0038] As shown, Figure 2 As shown, the handle 17 is installed on the shell 36 for carrying the torque detector.

[0039] The stopper ratchet in the scheme includes a ratchet cover 13, a reversing knob 14, and further includes an inner locking block, a knob cover and the like inside; the structure of the stopper ratchet is basically the same as that of the stopper ratchet in the utility model patent with publication number CN211317598U and the name of a torque detection device, which can be referred to for setting, in addition, the stopper ratchet technology belongs to the prior art, which will not be described in detail here; the torque detector 35 is installed on the shell 36, which can convert the electric signal generated by the strain gauge into a torque value and display it, which belongs to the technology known to those skilled in the art and will not be described in detail here.

[0040] The input shaft 9 extends out of the ratchet cover 13 of the stopper ratchet, and the gap between the input shaft 9 and the ratchet cover 13 is closed by a gasket B12. The input shaft 9 can be hexagonal, quadrangular or other polygonal shape, etc., and can be twisted by a wrench or a ratchet wrench. Because a large force is required when twisting the input shaft 9, and the bottom wall of the reserved hole is not horizontal due to the inclined punching of the reserved hole, the nut is twisted on an inclined plane, which is very inconvenient, and the twisting also affects the force. Therefore, in the scheme, a twisting device for twisting the input shaft 9 is installed on the input shaft 9. The twisting device includes a ratchet head 5, a fixed pin 4, a locking mechanism, an inner slide rod 2 and an outer sleeve rod 1. The ratchet head 5 has the same structure as the head of a general ratchet wrench, which belongs to the technical features known to those skilled in the art and will not be described in detail here. The input shaft 9 is inserted into the polygonal hole (which can be quadrangular, hexagonal, etc.) in the middle of the ratchet head 5. The inner slide rod 2 is rotationally connected to the ratchet head 5 through the fixed pin 4, and the outer sleeve rod 1 is slidingly connected to the inner slide rod 2. The end of the outer sleeve rod 1 is provided with a locking structure 3, which can fix the one end of the outer sleeve rod 1 to any position on the inner slide rod 2. The locking structure 3 can adopt the commonly used locking structure in the prior art, which belongs to the technology known to those skilled in the art and will not be described in detail here.

[0041] In the scheme, the wall thickness of the inner sleeve 33 is greatly increased, especially at the port position and the thickness of the nut hole 16, thereby increasing the structural strength.

[0042] As Figure 7 and 8 shown, the radius of the prefabricated block of the job in the present scheme is about 6.55 meters, the outer circle radius R of the reserved hole is about 57mm, the opening angle (that is, the angle between the two side walls) is about 53.5°, wherein the nut reaches about 2000N meters of torque; after the improvement, the structure integration degree of the torque detector of the present scheme is high, the height of the inner sleeve 33 is greatly reduced, the overall diameter is about 99mm, the height is about 235mm, which can just enter the reserved hole.

[0043] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the technical scheme of the utility model, and are not a limitation on the specific embodiments of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model claim should be included in the protection scope of the utility model claim.

Claims

1. A torque detector, comprising a housing (36), an input shaft (9) mounted on the housing (36), a stop ratchet, a reduction mechanism, an inner sleeve (33), and an outer sleeve (32), characterized in that: The outer sleeve (32) is detachably fixed on the housing (36). The input shaft (9) is connected to the inner sleeve (33) through a reduction mechanism. The reduction mechanism is detachably connected to the inner sleeve (33). The inner sleeve (33) is rotatably connected to the outer sleeve (32). The output end of the reduction mechanism is fixed with an inner support sleeve (27). The inner sleeve (33) is detachably installed on the inner support sleeve (27).

2. The torque detector according to claim 1, characterized in that: The inner support sleeve (27) is connected to the inner sleeve (33) by plugging and unplugging. After plugging and assembling, the inner support sleeve (27) and the inner sleeve (33) can be fixedly connected by fastening bolts (7).

3. A torque detector according to claim 2, characterized in that: The inner sleeve (33) has a first end and a second end. The outer circumference of the inner sleeve (33) is a stepped cylindrical structure with a gradually decreasing diameter from the first end to the second end. The interior of the inner sleeve (33) consists of a washer hole (50), a nut hole (16), a bolt clearance hole (15), a through hole (10), and a connecting hole (8) from the first end to the second end. The connecting hole (8) is used to connect the inner support sleeve (27).

4. A torque detector according to claim 2, characterized in that: The inner support sleeve (27) has a cavity at one end and a connector with a reduced diameter at the other end. A threaded hole communicating with the cavity is provided in the center. The connector is inserted into the connector hole (8). The inner support sleeve (27) is fixedly connected to the inner sleeve (33) by passing a fastening bolt (7) through the through hole (10) and threading it into the threaded hole.

5. A torque detector according to claim 2, characterized in that: One end of the outer sleeve (32) is rotatably connected to the inner support sleeve (27) via a composite bushing one (26), and the other end is rotatably connected to the inner sleeve (33) via a composite bushing two (31).

6. A torque detector according to claim 1, characterized in that: The housing (36) is provided with an internal spline (44), and the internal spline (44) is provided with a groove (45); the outer sleeve (32) has a first end and a second end. Starting from the first end of the outer sleeve (32), an external spline (51) and an annular groove (46) are provided in sequence. The diameter of the annular groove (46) is smaller than the diameter of the bottom of the keyway of the external spline (51). During assembly, the external spline (51) is inserted into the internal spline (44), and the groove (45) is opposite to a portion of the annular groove (46) near the first end of the outer sleeve (32). The groove (45) is filled with a retaining spring (47) with a width greater than the depth of the groove (45). An L-shaped retaining ring (28) is inserted between the retaining spring (47) and the bottom of the annular groove (46), and a retaining ring (29) is inserted between the annular groove (46) and the retaining ring (28).

7. A torque detector according to claim 6, characterized in that: A second annular groove (43) is provided on one side of the first annular groove (46) near the second end of the outer sleeve (32). A strain gauge is installed in the second annular groove (43). The thickness from the bottom of the second annular groove (43) to the inner wall of the outer sleeve (32) is the thinnest part of the wall of the outer sleeve (32).

8. A torque detector according to claim 7, characterized in that: The first end of the outer sleeve (32) is a reduced cylinder (42) with a smaller diameter. The first annular groove (46) and the second annular groove (43) are both set on the reduced cylinder (42). An annular sensor cover (30) is fitted on the reduced cylinder (42). After fitting, one end of the sensor cover (30) is connected to the port of the housing (36), and the other end is in contact with the end face formed by the reduced diameter of the outer sleeve (32).

9. A torque detector according to any one of claims 1-8, characterized in that: A reaction arm (34) is installed on the outer sleeve (32). The reaction arm (34) has an irregular polygonal structure with a wider connecting end and a narrower supporting end. The supporting end has a vertical supporting surface (41). From the bottom to the top of the irregular block (38), the supporting surface (41) gradually narrows. The supporting surface (41) is close to the outer wall of the outer sleeve (32). The supporting surface (41) is parallel to a tangent of the outer circle of the outer sleeve (32).

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