Torque wrench capable of adapting to pre-stressed anchor rods of multiple sizes

Abstract

The torque wrench capable of adapting to the pre-stressed anchor rods of the multiple sizes comprises an installation shell and a grouting pipe movably installed in the installation shell, one end of the grouting pipe movably penetrates out of one side of the installation shell, the other end of the grouting pipe is arranged in the installation shell, and internal threads are arranged on the inner wall of the other end of the grouting pipe. The grouting pipe (2) is installed in the installation shell in a rotating mode, the original hexagonal sleeve is installed in the installation shell in a rotating mode, the first driving mechanism drives the grouting pipe (2) to rotate in the axial direction, the second driving mechanism drives the original hexagonal sleeve (4) to rotate in the axial direction, and the third driving mechanism drives the grouting pipe (2) to slide in the axial direction. According to the torque wrench, the complete anchoring-grouting process can be achieved, and the anchor rod supporting construction efficiency is improved. And the power transmission efficiency of the bevel gear set is high, the stability of mechanical structural parts is high, the structure is compact, meanwhile, universality is good, and practicability is high. Moreover, the torque wrench can be used for construction of anchor rods of different models, and only corresponding anchor rod adapters need to be replaced so as to be matched with the anchor rods of different diameters, so that the torque wrench is better in universality and higher in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a torque wrench which can adapt to prestressed anchor rods of multiple sizes. Background Art

[0002] The torque wrench of the prestressed anchor is an important component installed on the anchor head of the anchor trolley. It is mainly used in some situations where the surrounding rock grade is poor, such as mine tunnels, water conservancy project slope protection, construction project slope protection, road and railway tunnels, etc., where anchor support is needed. That is, drilling holes in the loose rock and soil, inserting anchors and adding cement mortar to "reinforce" the loose rock and soil and stabilize the surrounding rock.

[0003] At present, anchor support construction is mainly divided into manual anchor support, semi-mechanized anchor support and fully mechanized anchor support. All three support methods require the anchor to be driven into the pre-drilled hole in the surface rock or the rock around the chamber, and then grouting is performed through the anchor, which cannot achieve the complete anchoring-grouting process, affecting the construction efficiency; and, according to the different surrounding rock grades and construction requirements at the construction site, the anchor models required are also different, resulting in the existing anchor wrenches not being able to fully meet the needs of all types of anchor support, and there are problems such as different anchor diameters cannot be matched and anchors cannot be grouted. To this end, we proposed a torque wrench that can adapt to prestressed anchors of multiple sizes. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a torque wrench that can adapt to prestressed anchor rods of multiple sizes to solve the technical problems raised in the above background technology.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A torque wrench adaptable to prestressed anchor rods of multiple sizes, comprising:

[0007] Install the shell;

[0008] A grouting pipe movably installed in the installation shell, one end of the grouting pipe movably passes through one side of the installation shell, the other end of the grouting pipe is arranged in the installation shell, and the inner wall of the other end of the grouting pipe has an internal thread;

[0009] The original hexagonal sleeve installed in the installation shell is rotated, and the other end portion of the grouting pipe is movably extended into the original hexagonal sleeve, and the original hexagonal sleeve is coaxially arranged with the grouting pipe;

[0010] An anchor adapter, the anchor adapter comprises an anchor adapter sleeve and a transfer hexagonal sleeve sleeved on the anchor adapter sleeve, one end of the anchor adapter sleeve is detachably connected to the other end of the grouting pipe, a partial connecting section of the transfer hexagonal sleeve is inserted into the original hexagonal sleeve and then detachably connected to the original hexagonal sleeve, and the transfer hexagonal sleeve rotates axially with the original hexagonal sleeve;

[0011] A first driving mechanism for driving the grouting pipe to rotate around the axial direction, wherein the first driving mechanism is arranged on the mounting shell;

[0012] A second driving mechanism for driving the original hexagonal sleeve to rotate axially, wherein the second driving mechanism is arranged on the mounting shell; and

[0013] A third driving mechanism drives the grouting pipe to slide axially, and the third driving mechanism is arranged outside the mounting shell.

[0014] Further, the first driving mechanism includes a first motor, a first bevel gear and a second bevel gear, the first bevel gear is mounted on the output shaft of the first motor, the second bevel gear is sleeved on the grouting pipe, and the second bevel gear is meshed with the first bevel gear;

[0015] The connecting sleeve of the second bevel gear is connected to the grouting pipe via a first flat key, an inner wall of the connecting sleeve of the second bevel gear is provided with an axially extending slide groove, one end of the slide groove is penetrated, and the first flat key portion is located in the slide groove;

[0016] The first motor is fixedly mounted on the outer wall of the mounting shell by means of bolts.

[0017] Furthermore, the second bevel gear is rotatably mounted in the mounting shell via a self-lubricating bearing sleeve, the rear end of the connecting sleeve of the second bevel gear has a slot, a half-moon ring friction plate is slidably arranged in the slot, and the outer edge of the half-moon ring friction plate is clamped on the mounting shell.

[0018] Further, the second driving mechanism includes a second motor, a third bevel gear and a fourth bevel gear, the third bevel gear is mounted on the output shaft of the second motor, the fourth bevel gear is movably sleeved on the grouting pipe, and the fourth bevel gear is meshed with the third bevel gear;

[0019] The connecting sleeve of the fourth bevel gear is arranged between the grouting pipe and the extension of the original hexagonal sleeve, and the fourth bevel gear is connected to the extension of the original hexagonal sleeve via a second flat key;

[0020] The second motor is fixedly mounted on the outer wall of the mounting shell by means of bolts.

[0021] Furthermore, the fourth bevel gear is rotatably mounted in the mounting shell via a self-lubricating bearing sleeve, a connecting sleeve of the fourth bevel gear has a slot in the middle, a half-moon ring friction plate is slidably arranged in the slot, and an outer edge of the half-moon ring friction plate is clamped on the mounting shell.

[0022] Furthermore, the outer wall of the extension of the original hexagonal sleeve near one end of the grouting pipe has an annular connecting groove, and a second limiting bolt is screwed on the mounting shell. The free end of the second limiting bolt passes through the shell of the mounting shell and is independently arranged in the connecting groove.

[0023] Furthermore, the third driving mechanism includes an oil cylinder having a piston member, the oil cylinder is fixedly mounted on the mounting shell, the grouting pipe is slidably inserted into the oil cylinder and the piston member, and the grouting pipe is rotatably connected to the piston member via a semi-lunar positioning plate.

[0024] Further, the outer wall of the original hexagonal sleeve is provided with an axially extending movable hole, the connecting section of the transition hexagonal sleeve is connected to the original hexagonal sleeve through a first limiting bolt, and the free end of the first limiting bolt passes through the movable hole and is screwed onto the connecting section of the transition hexagonal sleeve;

[0025] A spring is also provided between the first limiting bolt and the interior of the mounting shell, and the spring is sleeved on the original hexagonal sleeve.

[0026] Furthermore, the anchor rod adapter sleeve has a coaxial anchor rod connection section and a grouting pipe connection section, and the grouting pipe connection section is threadedly connected to the other end of the grouting pipe; the inner wall of the anchor rod connection section of the anchor rod adapter sleeve has an internal thread;

[0027] The anchor rod connecting section of the anchor rod adapter sleeve is coaxially rotatably connected with the adapter hexagonal sleeve.

[0028] Beneficial effects of the utility model: the utility model can realize the complete anchoring-grouting process and improve the efficiency of anchor support construction. The functional integration is high, the power transmission efficiency of the bevel gear set is high, the mechanical structure is stable, the structure is compact, and the versatility is good and the practicability is strong.

[0029] Furthermore, the torque wrench of the utility model can be used for construction of anchor rods of different types, and only needs to replace the corresponding anchor rod adapter to match anchor rods of different diameters. It has better versatility and stronger practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a torque wrench that can adapt to prestressed anchor rods of multiple sizes. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of a torque wrench that can adapt to prestressed anchor rods of multiple sizes. Figure 2 ;

[0032] Figure 3 It is a cross-sectional view of a torque wrench of the utility model that can adapt to prestressed anchor rods of multiple sizes;

[0033] Figure 4 It is a structural schematic diagram of the grouting pipe provided by the utility model;

[0034] Figure 5 It is a structural schematic diagram of the original hexagonal sleeve provided by the utility model;

[0035] Figure 6 It is a structural schematic diagram of the transfer hexagonal sleeve provided by the utility model;

[0036] Figure 7 This is a schematic diagram of the structure of the second bevel gear provided by the utility model. Figure 1 ;

[0037] Figure 8 This is a schematic diagram of the structure of the second bevel gear provided by the utility model. Figure 2 ;

[0038] Fig. 9 It is a structural schematic diagram of the fourth bevel gear proposed by the utility model;

[0039] Fig.10 The utility model is a structural schematic diagram of the anchor rod adapter sleeve. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0041] like Figure 1-Figure 2 As shown, the utility model is a torque wrench that can adapt to prestressed anchor rods of multiple sizes, including a mounting shell 1, a grouting pipe 2 movably installed in the mounting shell 1, an original hexagonal sleeve 4 rotatably installed in the mounting shell 1, an anchor rod adapter connected to the original hexagonal sleeve 4, a first driving mechanism for driving the grouting pipe 2 to rotate axially, a second driving mechanism for driving the original hexagonal sleeve 4 to rotate axially, and a third driving mechanism for driving the grouting pipe 2 to slide along the axial direction.

[0042] Specifically, the installation shell 1 is made of cast steel. Figure 2 and Figure 3As shown, the mounting shell 1 includes a cavity 25 with two open ends, a front cover 26 and a rear cover 27 fixedly mounted on the two open ends of the cavity 25 by bolts, and a front housing 28 fixedly mounted outside the front cover 26 by bolts, and both the front cover 26 and the rear cover 27 have through holes. The bottom of the cavity 25 has a mounting base plate 24 connected by a rib plate 23. When in use, the mounting base plate 24 is fixedly mounted on the robot arm by bolts.

[0043] Specifically, one end of the grouting pipe 2 is movably extended from one side of the mounting shell 1, and the other end of the grouting pipe 2 is arranged inside the mounting shell 1, and the inner wall of the other end of the grouting pipe 2 has an internal thread 3. The other end of the grouting pipe 2 is partially movably extended into the original hexagonal sleeve 4, and the original hexagonal sleeve 4 is coaxially arranged with the grouting pipe 2.

[0044] The original hexagonal sleeve 4 is rotatably mounted in the front housing 28. Specifically, Figure 1 , Figure 3 and Figure 5 As shown, the outer wall of one end of the extension of the original hexagonal sleeve 4 near the grouting pipe 2 has an annular connecting groove 32, and the second limiting bolt 30 is screwed on the mounting shell 1. The free end of the second limiting bolt 30 passes through the shell of the mounting shell 1 and is independently arranged in the connecting groove 32. The second limiting bolt 30 is used to axially limit the original hexagonal sleeve 4, so that the original hexagonal sleeve 4 cannot slide in the axial direction, but can only rotate in the axial direction.

[0045] The first driving mechanism and the second driving mechanism are arranged on the cavity 25 of the mounting shell 1. Specifically, Figure 2 and Figure 3 As shown, the first driving mechanism includes a first motor 5, a first bevel gear 6 and a second bevel gear 7. The first bevel gear 6 is mounted on the output shaft of the first motor 5, the second bevel gear 7 is sleeved on the grouting pipe 2, and the second bevel gear 7 is meshed with the first bevel gear 6.

[0046] The connecting sleeve of the second bevel gear 7 is connected to the grouting pipe 2 via a first flat key 8. Figure 7 As shown, the inner wall of the connecting sleeve of the second bevel gear 7 is provided with an axially extending slide groove 9, one end of the slide groove 9 is penetrated, and the first flat key 8 is partially arranged in the slide groove 9, so that the grouting pipe 2 can slide axially relative to the connecting sleeve of the second bevel gear 7. The first motor 5 is fixedly mounted on the outer wall of the cavity 25 of the mounting shell 1 by bolts.

[0047] The second bevel gear 7 is rotatably mounted in the mounting housing 1 through a self-lubricating bearing sleeve 10, so that the second bevel gear 7 can rotate. Figure 3 and Figure 8As shown, the rear end of the connecting sleeve of the second bevel gear 7 has a slot 11, in which a half-moon ring friction plate 12 is slidably arranged, and the outer edge of the half-moon ring friction plate 12 is clamped on the mounting shell 1. The half-moon ring friction plate 12 is used to axially limit the second bevel gear 7 to prevent the second bevel gear 7 from axial movement.

[0048] The second driving mechanism includes a second motor 13 , a third bevel gear 14 and a fourth bevel gear 15 . The third bevel gear 14 is mounted on the output shaft of the second motor 13 . The fourth bevel gear 15 is movably sleeved on the grouting pipe 2 . The fourth bevel gear 15 is meshed with the third bevel gear 14 .

[0049] The connecting sleeve of the fourth bevel gear 15 is arranged between the grouting pipe 2 and the extension of the original hexagonal sleeve 4. The fourth bevel gear 15 is connected to the extension of the original hexagonal sleeve 4 through the second flat key 16. The fourth bevel gear 15 drives the original hexagonal sleeve 4 to rotate axially. The second motor 13 is fixedly mounted on the outer wall of the cavity 25 of the mounting shell 1 by bolts.

[0050] The fourth bevel gear 15 is rotatably mounted in the mounting housing 1 through the self-lubricating bearing sleeve 10, so that the fourth bevel gear 15 can rotate. Figure 2 and Fig. 9 As shown, the connecting sleeve of the fourth bevel gear 15 has a slot 11 in the middle, and a half-moon ring friction plate 12 is slidably arranged in the slot 11. The outer edge of the half-moon ring friction plate 12 is clamped on the mounting shell 1, and the half-moon ring friction plate 12 is used to axially limit the fourth bevel gear 15 to prevent the fourth bevel gear 15 from axial movement.

[0051] The third driving mechanism is fixedly mounted on the rear end cover 27 of the mounting shell 1 by means of bolts. Figure 2 and Figure 3 As shown, the third driving mechanism includes an oil cylinder 17, the oil cylinder 17 has a piston 18, the oil cylinder 17 is fixedly mounted on the mounting shell 1, the grouting pipe 2 is slidably arranged in the oil cylinder 17 and the piston 18, and the grouting pipe 2 is rotatably connected to the piston 18 through a half-moon positioning plate 19. The piston 18 and the half-moon positioning plate 19 are fixedly connected by screws.

[0052] The oil cylinder 17 is fixedly mounted on the rear end cover 27 by bolts, and the piston 18 drives the grouting pipe 2 to slide axially through the half-moon positioning plate 19. Figure 4 As shown, a slot 11 is also provided on the grouting pipe 2, and a half-moon positioning plate 19 is movably provided in the slot 11 so as not to affect the rotation of the grouting pipe 2.

[0053] like Figure 1 , Figure 3 , Figure 6As shown, the anchor adapter includes an anchor adapter sleeve 29 and a adapter hexagonal sleeve 20 sleeved on the anchor adapter sleeve 29. One end of the anchor adapter sleeve 29 is detachably connected to the other end of the grouting pipe 2. After a partial connecting section of the adapter hexagonal sleeve 20 is inserted into the original hexagonal sleeve 4, it is detachably connected to the original hexagonal sleeve 4. The adapter hexagonal sleeve 20 rotates axially with the original hexagonal sleeve 4.

[0054] Specifically, Figure 2 and Figure 5 As shown, the outer wall of the original hexagonal sleeve 4 is provided with an axially extending movable hole 21, and the connecting section of the transition hexagonal sleeve 20 is connected to the original hexagonal sleeve 4 through a first limiting bolt 31. The free end of the first limiting bolt 31 passes through the movable hole 21 and is screwed to the connecting section of the transition hexagonal sleeve 20. A spring 22 is also provided between the first limiting bolt 31 and the inside of the mounting shell 1, and the spring 22 is sleeved on the original hexagonal sleeve 4.

[0055] like Figure 2 and Fig.10 As shown, the anchor rod adapter sleeve 29 has a coaxial anchor rod connection section and a grouting pipe connection section, and the grouting pipe connection section is threadedly connected to the other end of the grouting pipe 2. The inner wall of the anchor rod connection section of the anchor rod adapter sleeve 29 has an internal thread 3. The anchor rod connection section of the anchor rod adapter sleeve 29 is coaxially rotatably connected with the transition hexagonal sleeve 20, and the transition hexagonal sleeve 20 is sleeved on the anchor rod connection section of the anchor rod adapter sleeve 29.

[0056] When used in specific construction, different types of anchor rods have matching anchor rod adapters. When the anchor rod is installed on the torque wrench, it needs to be used in conjunction with the matching anchor rod adapter. The inner diameter size of the anchor rod adapter sleeve of each anchor rod adapter is different, but the outer diameter size is the same. The inner diameter size of the adapter hexagonal sleeve of each anchor rod adapter is different, but the outer diameter size is the same. Due to the different inner diameter sizes, different types of anchor rods can be transferred. Therefore, when carrying out anchor support construction, it is necessary to replace the corresponding anchor rod adapter according to the anchor rod model to match anchor rods of different diameters.

[0057] like Figure 2 As shown, when replacing the anchor adapter, first remove the first limiting bolt 31, then extract the adapter hexagonal sleeve 20 from the original hexagonal sleeve 4, and finally unscrew the anchor adapter sleeve 29 from the grouting pipe 2. The steps for installing a new anchor adapter are opposite to the above replacement steps.

[0058] The working principle of the utility model is as follows:

[0059] Taking the mechanical prestressed hollow anchor as an example, the first step is preparation, using the rock drill on the anchor head to drill holes. After the drilling is completed, the working beam is switched to start the anchor operation.

[0060] The anchor rod is taken out from the anchor rod warehouse by the manipulator, and the end of the anchor rod with the nut is installed in the anchor rod connection section of the anchor rod adapter sleeve 29. Then the piston 18 of the oil cylinder 17 is driven to move forward, and the half-moon positioning plate 19 and the grouting pipe 2 are positioned and connected, so that the grouting pipe 2 can be pushed forward to a position flush with the adapter hexagonal sleeve 20, and then the entire anchor rod torque wrench and the anchor rod are pushed into the anchor rod hole by the manipulator, and the anchor rod torque wrench does not need to do any action at this time.

[0061] If the anchor is stuck, the first motor 5 can be started to drive the grouting pipe 2 to rotate, and the rotation of the grouting pipe 2 drives the anchor adapter sleeve 29 to rotate, and the anchor is screwed into the anchor hole until the adapter hexagonal sleeve 20 hits the rock wall. Since the first limit bolt 31 can move in the movable hole 21, the adapter hexagonal sleeve 20 moves toward the front end cover 26, and the first limit bolt 31 contacts the spring 22, which is compressed and plays a buffering role to avoid rigid collision.

[0062] Then, the first motor 5 is started to rotate in the reverse direction to control the grouting pipe 2 to rotate in the reverse direction, so that the anchor rod rotates out of the anchor rod hole. At the same time, the piston 18 of the driving cylinder 17 moves backward, and the expansion head of the anchor rod head begins to open during the outward rotation of the anchor rod, playing the role of locking the anchor rod. At this time, the rotation of the anchor rod is stopped, and the nut enters the adapter hexagonal sleeve 20.

[0063] Start the second motor 13 to drive the original hexagonal sleeve 4 to rotate. The original hexagonal sleeve 4 synchronously drives the adapter hexagonal sleeve 20 to rotate through the first limiting bolt 31. The nut on the anchor rod is located in the adapter hexagonal sleeve 20. The adapter hexagonal sleeve 20 drives the nut to rotate and pushes the 10 cm square steel plate to the rock wall and then locks the nut, which plays the role of locking the anchor rod from the outside.

[0064] Finally, the anchor hole is grouted, and the slurry enters the anchor adapter sleeve 29 from the grouting pipe 2 and then enters the anchor, and finally comes out from the anchor head to fill the cracks in the drilling process until the slurry overflows from the anchor periphery, that is, the grouting work is finished. After the grouting is completed, the first motor 5 is started to rotate in the reverse direction to exit the anchor adapter sleeve 29.

[0065] After the anchor work is completed, the grouting pipe 2 needs to be cleaned. After injecting clean water into the grouting pump, the entire vehicle anchor grouting pipeline is cleaned to prevent mud from blocking the pipe and affecting the next use. The anchor support is completed.

[0066] In summary, the utility model can realize the complete anchoring-grouting process and improve the efficiency of anchor support construction. It has high functional integration, high power transmission efficiency of the bevel gear set, strong stability of mechanical structural parts, compact structure, good versatility and strong practicality.

[0067] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A torque wrench adaptable to prestressed anchor rods of various sizes, characterized in that: include: Mounting shell (1); A grouting pipe (2) is movably installed in the installation shell (1), one end of the grouting pipe (2) movably passes through one side of the installation shell (1), the other end of the grouting pipe (2) is arranged in the installation shell (1), and the inner wall of the other end of the grouting pipe (2) has an internal thread (3); The original hexagonal sleeve (4) is rotatably mounted in the mounting shell (1), and the other end portion of the grouting pipe (2) is movably extended into the original hexagonal sleeve (4), and the original hexagonal sleeve (4) and the grouting pipe (2) are coaxially arranged; An anchor rod adapter, the anchor rod adapter comprising an anchor rod adapter sleeve (29) and an adapter hexagonal sleeve (20) sleeved on the anchor rod adapter sleeve (29), one end of the anchor rod adapter sleeve (29) being detachably connected to the other end of the grouting pipe (2), a partial connecting section of the adapter hexagonal sleeve (20) being inserted into the original hexagonal sleeve (4) and then being detachably connected to the original hexagonal sleeve (4), the adapter hexagonal sleeve (20) being axially rotated with the original hexagonal sleeve (4); A first driving mechanism for driving the grouting pipe (2) to rotate axially, the first driving mechanism being arranged on the mounting shell (1); a second driving mechanism for driving the original hexagonal sleeve (4) to rotate axially, the second driving mechanism being arranged on the mounting shell (1); and A third driving mechanism drives the grouting pipe (2) to slide axially, and the third driving mechanism is arranged outside the mounting shell (1).

2. A torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 1, characterized in that: The first driving mechanism comprises a first motor (5), a first bevel gear (6) and a second bevel gear (7), wherein the first bevel gear (6) is mounted on an output shaft of the first motor (5), the second bevel gear (7) is sleeved on the grouting pipe (2), and the second bevel gear (7) is meshed with the first bevel gear (6); The connecting sleeve of the second bevel gear (7) is connected to the grouting pipe (2) via a first flat key (8); an axially extending slide groove (9) is provided on the inner wall of the connecting sleeve of the second bevel gear (7); one end of the slide groove (9) is penetrated, and a portion of the first flat key (8) is located in the slide groove (9); The first motor (5) is fixedly mounted on the outer wall of the mounting shell (1) by means of bolts.

3. A torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 2, characterized in that: The second bevel gear (7) is rotatably mounted in the mounting shell (1) via a self-lubricating bearing sleeve (10); the rear end of the connecting sleeve of the second bevel gear (7) has a slot (11); a half-moon ring friction plate (12) is slidably arranged in the slot (11); and the outer edge of the half-moon ring friction plate (12) is clamped on the mounting shell (1).

4. The torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 1, characterized in that: The second driving mechanism comprises a second motor (13), a third bevel gear (14) and a fourth bevel gear (15), wherein the third bevel gear (14) is mounted on the output shaft of the second motor (13), the fourth bevel gear (15) is movably sleeved on the grouting pipe (2), and the fourth bevel gear (15) is meshed with the third bevel gear (14); The connecting sleeve of the fourth bevel gear (15) is arranged between the grouting pipe (2) and the extension of the original hexagonal sleeve (4), and the fourth bevel gear (15) and the extension of the original hexagonal sleeve (4) are connected via a second flat key (16); The second motor (13) is fixedly mounted on the outer wall of the mounting shell (1) by means of bolts.

5. A torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 4, characterized in that: The fourth bevel gear (15) is rotatably mounted in the mounting shell (1) via a self-lubricating bearing sleeve (10); a connecting sleeve of the fourth bevel gear (15) has a slot (11) in the middle, a half-moon ring friction plate (12) is slidably arranged in the slot (11), and an outer edge portion of the half-moon ring friction plate (12) is clamped on the mounting shell (1).

6. The torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 4, characterized in that: The extension of the original hexagonal sleeve (4) has an annular connecting groove (32) on the outer wall of one end close to the grouting pipe (2), and a second limiting bolt (30) is screwed on the mounting shell (1), and the free end of the second limiting bolt (30) passes through the shell of the mounting shell (1) and is independently arranged in the connecting groove (32).

7. The torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 1, characterized in that: The third driving mechanism comprises an oil cylinder (17), the oil cylinder (17) having a piston member (18), the oil cylinder (17) being fixedly mounted on the mounting shell (1), the grouting pipe (2) being slidably arranged in the oil cylinder (17) and the piston member (18), and the grouting pipe (2) being rotatably connected to the piston member (18) via a semi-lunar positioning plate (19).

8. The torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 1, characterized in that: The outer wall of the original hexagonal sleeve (4) is provided with an axially extending movable hole (21), the connecting section of the transition hexagonal sleeve (20) is connected to the original hexagonal sleeve (4) via a first limiting bolt (31), and the free end of the first limiting bolt (31) passes through the movable hole (21) and is screwed onto the connecting section of the transition hexagonal sleeve (20); A spring (22) is also provided between the first limiting bolt (31) and the interior of the mounting shell (1), and the spring (22) is sleeved on the original hexagonal sleeve (4).

9. The torque wrench adaptable to prestressed anchor rods of multiple sizes according to claim 1, characterized in that: The anchor rod adapter sleeve (29) has a coaxial anchor rod connection section and a grouting pipe connection section, and the grouting pipe connection section is threadedly connected to the other end of the grouting pipe (2); the inner wall of the anchor rod connection section of the anchor rod adapter sleeve (29) has an internal thread (3); The anchor rod connecting section of the anchor rod adapter sleeve (29) is coaxially rotatably connected to the adapter hexagonal sleeve (20).

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