A drilling device and matching expansion screw

Abstract

The present invention relates to the technical field of drilling devices and expansion screws, and discloses a drilling device and a matching expansion screw structure. A special-shaped hole is drilled on a bridge by the drilling device. The special-shaped hole includes an upper groove and a lower groove. The expansion screw includes a first external expansion structure and a second external expansion structure. The first external expansion structure is expanded and tightened in the upper groove of the special-shaped hole, and the external expansion structure of the second external expansion structure is expanded and tightened in the lower groove of the special-shaped hole to prevent the expansion screw from falling out.

Description

Technical Field

[0001] The invention relates to the technical field of drilling devices and expansion screws, and discloses a drilling device and a matching expansion screw structure, in particular to a drilling device for special-shaped holes and an expansion screw with two external expansion structures. Background Art

[0002] During the construction of a bridge, it is often necessary to drill holes in the bridge and then insert expansion screws to achieve a fixed connection.

[0003] However, in the prior art, a straight hole is drilled on the bridge and then an expansion screw is placed in the straight hole. The tightened screw is fixed in the straight hole by friction. However, due to the vibration of the bridge, the hole wall of the straight hole is easily worn and broken, so that there is a risk of the expansion screw coming out, which poses a certain threat to the safety of the bridge. Summary of the invention

[0004] The present invention provides a drilling device and a matching expansion screw structure. The drilling device is used to drill a special-shaped hole on a bridge. The special-shaped hole includes an upper groove and a lower groove. The expansion screw includes a first external expansion structure and a second external expansion structure. The first external expansion structure is expanded and tightened in the upper groove of the special-shaped hole, and the second external expansion structure is expanded and tightened in the lower groove of the special-shaped hole to solve the above-mentioned technical problems.

[0005] A drilling device comprises a trolley, on which a first lifting device is arranged, the first lifting device is used to drive a lifting plate to lift and lower, a second motor and a chuck are arranged below the lifting plate, a gear is arranged at the output end of the second motor, a gear ring is arranged at the outer side of the chuck, the gear and the gear ring are meshed, and the second motor drives the chuck to rotate through the gear and the gear ring; the chuck is used to clamp a drill rod.

[0006] Preferably, the first lifting device includes a first motor, a threaded shaft, and a lifting block. The first motor drives the threaded shaft to rotate through a bevel gear set. The threaded shaft is threadedly connected with the lifting block, and one end of the lifting block is fixedly connected to the lifting plate.

[0007] Preferably, a guide column is provided on the trolley, and the guide column passes through the lifting block to guide the movement of the lifting block.

[0008] A first fixing frame is arranged above the lifting plate, a hydraulic cylinder is fixedly arranged in the first fixing frame, a pull rod is fixedly connected to the end of the telescopic rod of the hydraulic cylinder, and the pull rod passes through the lifting plate and the chuck and penetrates into the interior of the drill rod.

[0009] Two groups of through holes are arranged on the drill rod, and two groups of auxiliary drilling structures are arranged inside the drill rod. The auxiliary drilling structure includes an auxiliary drill bit, a first conical friction wheel, two second conical friction wheels, a second fixed frame and a spring telescopic rod. Spring telescopic rods are respectively arranged on both sides of the second fixed frame, and the spring telescopic rod is rotatably connected to the second conical friction wheel. The auxiliary drill bit is fixedly connected to the side of the second conical friction wheel away from the spring telescopic rod. The first conical friction wheel is arranged on the pull rod, and the pull rod passes through the second fixed frame and is movably connected to the second fixed frame.

[0010] During operation, due to the action of the spring telescopic rod, the auxiliary drill bit is inside the drill rod, and the second motor drives the drill rod to rotate, and first drills a straight hole; after the straight hole of the specified depth is drilled, the pressure cylinder drives the pull rod to move upward, and the pull rod drives the first conical friction wheel to move upward, and the first conical friction wheel contacts the second conical friction wheel, and the first conical friction wheel continues to move upward so that the second conical friction wheel drives the auxiliary drill bit to pass through the through hole on the drill rod. The second motor drives the drill rod to rotate, and because the pull rod does not rotate, when the drill rod rotates, the second conical friction wheels on both sides drive the auxiliary drill bit to rotate, that is, the auxiliary drill bit rotates around the drill rod while rotating, so as to improve the drilling efficiency of the anisotropic hole.

[0011] Preferably, the drill rod and the auxiliary drill bit are provided with chip removal grooves.

[0012] Preferably, a driving structure is provided to drive the trolley to move.

[0013] Preferably, it is provided with a control structure for controlling the first motor and the second motor.

[0014] An expansion screw comprises a threaded rod, a first external expansion structure and a second external expansion structure, wherein the first external expansion structure and the second external expansion structure are both arranged on the outside of the threaded rod, and the first external expansion structure has the same structure as the second external expansion structure, and the first external expansion structure corresponds to an upper groove of a special-shaped hole, and the second external expansion structure corresponds to a lower groove of the special-shaped hole.

[0015] The first external expansion structure and the second external expansion structure both include a first nut, an expansion sleeve and a second nut, and the threaded rod has opposite thread directions corresponding to the first nut and the second nut. By rotating the threaded rod, the first nut and the second nut move relative to each other, thereby squeezing the expansion sleeve to expand outward.

[0016] Place the expansion screw in the special-shaped hole, rotate the threaded rod to expand the first expansion structure and the second expansion structure respectively, the first expansion structure expands tightly in the upper groove of the special-shaped hole, and the second expansion structure expands tightly in the lower groove of the special-shaped hole.

[0017] Preferably, the threaded rod, the first outward expansion structure and the second outward expansion structure are all made of metal material.

[0018] The beneficial effects of the above technical solution of the present invention are as follows:

[0019] (1) A special-shaped hole is drilled on the bridge, the special-shaped hole includes an upper groove and a lower groove, and the expansion screw includes a first external expansion structure and a second external expansion structure. The first external expansion structure is expanded and tightened in the upper groove of the special-shaped hole, and the external expansion structure of the second external expansion structure is expanded and tightened in the lower groove of the special-shaped hole to prevent the expansion screw from falling out.

[0020] (2) After the straight hole of the specified depth is drilled, the pressure cylinder drives the pull rod to move upward, and the pull rod drives the first conical friction wheel to move upward. The first conical friction wheel contacts the second conical friction wheel. The first conical friction wheel continues to move upward so that the second conical friction wheel drives the auxiliary drill bit to pass through the through hole on the drill rod, so that the auxiliary drill bit rotates around the drill rod while also rotating on itself, so as to improve the drilling efficiency of the anisotropic hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure of the drilling device of the present invention;

[0022] Figure 2 A drilling structure of the drilling device of the present invention;

[0023] Figure 3 for Figure 2 A magnified view of part A;

[0024] Figure 4 It is a structure of special-shaped holes;

[0025] Figure 5 The structure of the expansion screw of the present invention;

[0026] Figure 6 It is a schematic diagram of the expansion screw of the present invention in the special-shaped hole.

[0027] Wherein: 1-mobile trolley, 2-first motor, 3-threaded shaft, 4-lifting block, 5-guide column, 6-lifting plate, 7-second motor, 8-gear, 9-gear ring, 10-chuck, 11-drill rod, 12-first fixed frame, 13-hydraulic cylinder, 14-pull rod, 15-auxiliary drill bit, 16-first conical friction wheel, 17-second conical friction wheel, 18-second fixed frame, 19-spring telescopic rod, 20-threaded rod, 21-first nut, 22-expansion sleeve, 23-second nut, 24-first external expansion structure, 25-second external expansion structure, 26-upper groove, 27-lower groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0029] The present invention provides a drilling device and a matching expansion screw structure. The drilling device is used to drill a special-shaped hole on a bridge. The special-shaped hole includes an upper groove 26 and a lower groove 27. The expansion screw includes a first external expansion structure 24 and a second external expansion structure 25. The first external expansion structure 24 is expanded and tightened in the upper groove 26 of the special-shaped hole, and the second external expansion structure 25 is expanded and tightened in the lower groove 27 of the special-shaped hole.

[0030] according to Figure 1-Figure 3 As shown, a drilling device includes a trolley 1, on which a first lifting device is provided, the first lifting device is used to drive the lifting plate 6 to lift and lower, a second motor 7 and a chuck 10 are rotatably provided below the lifting plate 6, a gear 8 is provided at the output end of the second motor 7, a gear ring 9 is provided on the outer side of the chuck 10, the gear 8 and the gear ring 9 are meshed, and the second motor 7 drives the chuck 10 to rotate through the gear 8 and the gear ring 9; the chuck 10 is used to clamp a drill rod 11.

[0031] Preferably, the first lifting device includes a first motor 2, a threaded shaft 3, and a lifting block 4. The first motor 2 drives the threaded shaft 3 to rotate through a bevel gear set. The threaded shaft 3 is threadedly connected with the lifting block 4, and one end of the lifting block 4 is fixedly connected to the lifting plate 6.

[0032] Preferably, a guide column 5 is provided on the trolley 1 , and the guide column 5 passes through the lifting block 4 to guide the movement of the lifting block 4 .

[0033] A first fixed frame 12 is arranged above the lifting plate 6, and a hydraulic cylinder 13 is fixedly arranged inside the first fixed frame 12. The end of the telescopic rod of the hydraulic cylinder 13 is fixedly connected to a pull rod 14, which passes through the lifting plate 6 and the chuck 10 and penetrates into the interior of the drill pipe 11.

[0034] Two groups of through holes are arranged on the drill rod 11, and two groups of auxiliary drilling structures are arranged inside the drill rod 11. The auxiliary drilling structure includes an auxiliary drill bit 15, a first conical friction wheel 16, two second conical friction wheels 17, a second fixed frame 18 and a spring telescopic rod 19. The spring telescopic rod 19 is rotatably connected to the second conical friction wheel 17. The auxiliary drill bit is fixedly connected to the side of the second conical friction wheel 17 away from the spring telescopic rod. The first conical friction wheel 16 is arranged on the pull rod 14, and the pull rod 14 passes through the second fixed frame 18 and is movably connected to the second fixed frame 18.

[0035] During operation, due to the action of the spring telescopic rod 19, the auxiliary drill bit 15 is inside the drill rod 11, and the second motor 7 drives the drill rod 11 to rotate, and first drills a straight hole; after the straight hole of the specified depth is drilled, the pressure cylinder 13 drives the pull rod 14 to move upward, and the pull rod 14 drives the first conical friction wheel 16 to move upward, and the first conical friction wheel 16 contacts the second conical friction wheel 17, and the first conical friction wheel 16 continues to move upward so that the second conical friction wheel 17 drives the auxiliary drill bit 15 to pass through the through hole on the drill rod 11. The second motor 7 drives the drill rod 11 to rotate, and because the pull rod 14 does not rotate, when the drill rod 11 rotates, the second conical friction wheels 17 on both sides drive the auxiliary drill bit 15 to rotate, that is, the auxiliary drill bit 15 rotates around the drill rod 11 while rotating, so as to improve the drilling efficiency of the anisotropic hole.

[0036] Preferably, the drill rod 11 and the auxiliary drill bit 15 are provided with chip removal grooves.

[0037] Preferably, a driving structure is provided to drive the trolley 1 to move.

[0038] Preferably, it is provided with a control structure for controlling the first motor 2 and the second motor 7 .

[0039] according to Figure 4-Figure 6 As shown, an expansion screw includes a threaded rod 20, a first external expansion structure 24 and a second external expansion structure 25. The first external expansion structure 24 and the second external expansion structure 25 are both arranged on the outside of the threaded rod 20, and the structure of the first external expansion structure 24 is the same as that of the second external expansion structure 25. The first external expansion structure 24 corresponds to the upper groove 26 of the special-shaped hole, and the second external expansion structure 25 corresponds to the lower groove 27 of the special-shaped hole.

[0040] The first external expansion structure 24 and the second external expansion structure 25 both include a first nut 21, an expansion sleeve 22 and a second nut 23. The threaded rod 20 has opposite thread directions corresponding to the first nut 21 and the second nut 23. By rotating the threaded rod 20, the first nut 21 and the second nut 23 move relative to each other, thereby squeezing the expansion sleeve 22 to expand outward.

[0041] Place the expansion screw in the special-shaped hole, rotate the threaded rod 20 to expand the first expansion structure 24 and the second expansion structure 25 respectively, the first expansion structure 24 expands tightly in the upper groove 26 of the special-shaped hole, and the second expansion structure 25 expands tightly in the lower groove 27 of the special-shaped hole.

[0042] Preferably, the threaded rod 20 , the first bulging structure 24 and the second bulging structure 25 are all made of metal material.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A drilling device for drilling a special-shaped hole, the special-shaped hole comprising an upper groove and a lower groove, characterized in that: The device comprises a trolley, on which a first lifting device is arranged, the first lifting device is used to drive the lifting plate to lift, a second motor and a chuck are arranged below the lifting plate, a gear is arranged at the output end of the second motor, a gear ring is arranged on the outer side of the chuck, the gear and the gear ring are meshed, and the second motor drives the chuck to rotate through the gear and the gear ring; the chuck is used to clamp the drill rod; A first fixing frame is arranged above the lifting plate, a hydraulic cylinder is fixedly arranged in the first fixing frame, a pull rod is fixedly connected to the end of the telescopic rod of the hydraulic cylinder, and the pull rod passes through the lifting plate and the chuck and penetrates into the interior of the drill rod; Two groups of through holes are arranged on the drill rod, and two groups of auxiliary drilling structures are arranged inside the drill rod. The auxiliary drilling structure includes an auxiliary drill bit, a first conical friction wheel, two second conical friction wheels, a second fixed frame and a spring telescopic rod. Spring telescopic rods are respectively arranged on both sides of the second fixed frame, and the spring telescopic rod is rotatably connected to the second conical friction wheel. The auxiliary drill bit is fixedly connected to the side of the second conical friction wheel away from the spring telescopic rod. The first conical friction wheel is arranged on the pull rod, and the pull rod passes through the second fixed frame and is movably connected to the second fixed frame.

2. The drilling device according to claim 1, characterized in that The first lifting device includes a first motor, a threaded shaft, and a lifting block. The first motor drives the threaded shaft to rotate through a bevel gear set. The threaded shaft is threadedly connected with the lifting block, and one end of the lifting block is fixedly connected to the lifting plate.

3. The drilling device according to claim 2, characterized in that A guide column is arranged on the trolley, and the guide column passes through the lifting block to guide the movement of the lifting block.

4. The drilling device according to claim 1, characterized in that The drill rod and the auxiliary drill bit are provided with chip removal grooves.

5. The drilling device according to claim 1, characterized in that: A driving structure is provided to drive the trolley to move.

6. The drilling device according to claim 2, characterized in that: It is provided with a control structure for controlling the first motor and the second motor.

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